all: sync with master; upd chlog

2023-06-07 20:04:01 +03:00 · 2023-06-07 20:04:01 +03:00 · c65700923a
parent 7030c7c24c
commit c65700923a
76 changed files with 2998 additions and 1909 deletions
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@ -1,7 +1,7 @@
 'name': 'build'

 'env':
-  'GO_VERSION': '1.19.8'
+  'GO_VERSION': '1.19.10'
  'NODE_VERSION': '14'

 'on':
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@ -1,7 +1,7 @@
 'name': 'lint'

 'env':
-  'GO_VERSION': '1.19.8'
+  'GO_VERSION': '1.19.10'

 'on':
  'push':
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -14,21 +14,57 @@ and this project adheres to
 <!--
 ## [v0.108.0] - TBA

-## [v0.107.30] - 2023-04-26 (APPROX.)
+## [v0.107.31] - 2023-06-28 (APPROX.)

-See also the [v0.107.30 GitHub milestone][ms-v0.107.30].
+See also the [v0.107.31 GitHub milestone][ms-v0.107.31].

-[ms-v0.107.30]: https://github.com/AdguardTeam/AdGuardHome/milestone/66?closed=1
+[ms-v0.107.31]: https://github.com/AdguardTeam/AdGuardHome/milestone/67?closed=1

 NOTE: Add new changes BELOW THIS COMMENT.
 -->

+### Added
+
+- The ability to edit rewrite rules via `PUT /control/rewrite/update` HTTP API
+  ([#1577]).
+
+[#1577]: https://github.com/AdguardTeam/AdGuardHome/issues/1577
+
 <!--
 NOTE: Add new changes ABOVE THIS COMMENT.
 -->



+## [v0.107.30] - 2023-06-07
+
+See also the [v0.107.30 GitHub milestone][ms-v0.107.30].
+
+### Security
+
+- Go version has been updated to prevent the possibility of exploiting the
+  CVE-2023-29402, CVE-2023-29403, and CVE-2023-29404 Go vulnerabilities fixed in
+  [Go 1.19.10][go-1.19.10].
+
+### Fixed
+
+- Unquoted IPv6 bind hosts with trailing colons erroneously considered
+  unspecified addresses are now properly validated ([#5752]).
+
+  **NOTE:** the Docker healthcheck script now also doesn't interpret the `""`
+  value as unspecified address.
+- Incorrect `Content-Type` header value in `POST /control/version.json` and `GET
+  /control/dhcp/interfaces` HTTP APIs ([#5716]).
+- Provided bootstrap servers are now used to resolve the hostnames of plain
+  UDP/TCP upstream servers.
+
+[#5716]: https://github.com/AdguardTeam/AdGuardHome/issues/5716
+
+[go-1.19.10]:   https://groups.google.com/g/golang-announce/c/q5135a9d924/m/j0ZoAJOHAwAJ
+[ms-v0.107.30]: https://github.com/AdguardTeam/AdGuardHome/milestone/66?closed=1
+
+
+
 ## [v0.107.29] - 2023-04-18

 See also the [v0.107.29 GitHub milestone][ms-v0.107.29].
@ -55,6 +91,7 @@ See also the [v0.107.29 GitHub milestone][ms-v0.107.29].
 [#5712]: https://github.com/AdguardTeam/AdGuardHome/issues/5712
 [#5721]: https://github.com/AdguardTeam/AdGuardHome/issues/5721
 [#5725]: https://github.com/AdguardTeam/AdGuardHome/issues/5725
+[#5752]: https://github.com/AdguardTeam/AdGuardHome/issues/5752

 [ms-v0.107.29]: https://github.com/AdguardTeam/AdGuardHome/milestone/65?closed=1

@ -1949,11 +1986,12 @@ See also the [v0.104.2 GitHub milestone][ms-v0.104.2].


 <!--
-[Unreleased]: https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.30...HEAD
-[v0.107.30]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.29...v0.107.30
+[Unreleased]: https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.31...HEAD
+[v0.107.31]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.30...v0.107.31
 -->

-[Unreleased]: https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.29...HEAD
+[Unreleased]: https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.30...HEAD
+[v0.107.30]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.29...v0.107.30
 [v0.107.29]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.28...v0.107.29
 [v0.107.28]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.27...v0.107.28
 [v0.107.27]:  https://github.com/AdguardTeam/AdGuardHome/compare/v0.107.26...v0.107.27
--- a/README.md
+++ b/README.md
@ -466,6 +466,10 @@ bug or implementing the feature.
    Home](https://github.com/ebrianne/adguard-exporter) by
    [@ebrianne](https://github.com/ebrianne).

+ *  [Terminal-based, real-time traffic monitoring and statistics for your AdGuard Home
+    instance](https://github.com/Lissy93/AdGuardian-Term) by
+    [@Lissy93](https://github.com/Lissy93)
+
 *  [AdGuard Home on GLInet
    routers](https://forum.gl-inet.com/t/adguardhome-on-gl-routers/10664) by
    [Gl-Inet](https://gl-inet.com/).
--- a/bamboo-specs/release.yaml
+++ b/bamboo-specs/release.yaml
@ -7,7 +7,7 @@
 # Make sure to sync any changes with the branch overrides below.
 'variables':
  'channel': 'edge'
-  'dockerGo': 'adguard/golang-ubuntu:6.3'
+  'dockerGo': 'adguard/golang-ubuntu:6.7'

 'stages':
 - 'Build frontend':
@ -249,8 +249,7 @@
        env\
                SNAPCRAFT_CHANNEL="$snapchannel"\
                SNAPCRAFT_EMAIL="${bamboo.snapcraftEmail}"\
-                SNAPCRAFT_MACAROON="${bamboo.snapcraftMacaroonPassword}"\
-                SNAPCRAFT_UBUNTU_DISCHARGE="${bamboo.snapcraftUbuntuDischargePassword}"\
+                SNAPCRAFT_STORE_CREDENTIALS="${bamboo.snapcraftMacaroonPassword}"\
                ../bamboo-deploy-publisher/deploy.sh adguard-home-snap
  'final-tasks':
  - 'clean'
@ -331,7 +330,7 @@
    # need to build a few of these.
    'variables':
      'channel': 'beta'
-      'dockerGo': 'adguard/golang-ubuntu:6.3'
+      'dockerGo': 'adguard/golang-ubuntu:6.7'
 # release-vX.Y.Z branches are the branches from which the actual final release
 # is built.
 - '^release-v[0-9]+\.[0-9]+\.[0-9]+':
@ -346,4 +345,4 @@
    # are the ones that actually get released.
    'variables':
      'channel': 'release'
-      'dockerGo': 'adguard/golang-ubuntu:6.3'
+      'dockerGo': 'adguard/golang-ubuntu:6.7'
--- a/bamboo-specs/test.yaml
+++ b/bamboo-specs/test.yaml
@ -5,7 +5,7 @@
  'key': 'AHBRTSPECS'
  'name': 'AdGuard Home - Build and run tests'
 'variables':
-  'dockerGo': 'adguard/golang-ubuntu:6.3'
+  'dockerGo': 'adguard/golang-ubuntu:6.7'

 'stages':
 - 'Tests':
--- a/client/src/__locales/be.json
+++ b/client/src/__locales/be.json
@ -150,7 +150,7 @@
    "dns_allowlists": "Белыя спісы DNS",
    "dns_blocklists_desc": "AdGuard Home будзе блакаваць дамены з чорных спісаў.",
    "dns_allowlists_desc": "Дамены з белых спісаў DNS будуць дазволены, нават калі яны знаходзяцца ў любым з чорных спісаў.",
-    "custom_filtering_rules": "Карыстацкія правілы фільтрацыі",
+    "custom_filtering_rules": "Карыстальніцкія правілы фільтрацыі",
    "encryption_settings": "Налады шыфравання",
    "dhcp_settings": "Налады DHCP",
    "upstream_dns": "Upstream DNS-серверы",
@ -247,7 +247,7 @@
    "loading_table_status": "Загрузка...",
    "page_table_footer_text": "Старонка",
    "rows_table_footer_text": "радкоў",
-    "updated_custom_filtering_toast": "Занесены змены ў карыстацкія правілы",
+    "updated_custom_filtering_toast": "Карыстальніцкія правілы паспяхова захаваны",
    "rule_removed_from_custom_filtering_toast": "Карыстацкае правіла выдалена: {{rule}}",
    "rule_added_to_custom_filtering_toast": "Карыстацкае правіла дададзена: {{rule}}",
    "query_log_response_status": "Статус: {{value}}",
@ -568,7 +568,7 @@
    "check_desc": "Праверыць фільтрацыю імя хаста",
    "check": "Праверыць",
    "form_enter_host": "Увядзіце імя хаста",
-    "filtered_custom_rules": "Адфільтраваны з дапамогай карыстацкіх правілаў фільтрацыі",
+    "filtered_custom_rules": "Адфільтраваны з дапамогай карыстальніцкіх правіл фільтрацыі",
    "choose_from_list": "Абраць са спіса",
    "add_custom_list": "Дадаць свой спіс",
    "host_whitelisted": "Хост занесены ў белы спіс",
--- a/client/src/__locales/fa.json
+++ b/client/src/__locales/fa.json
@ -268,6 +268,8 @@
    "blocking_mode_nxdomain": "NXDOMAIN: پاسخ با کُد NXDOMAIN",
    "blocking_mode_null_ip": "Null IP: پاسخ با آدرس آی پی صفر(0.0.0.0 برای A; :: برای AAAA)",
    "blocking_mode_custom_ip": "آی پی دستی: پاسخ با آدرس آی پی دستی تنظیم شده",
+    "theme_light": "پوسته روشن",
+    "theme_dark": "پوسته تیره",
    "upstream_dns_client_desc": "اگر این فیلد را خالی نگه دارید، AdGuard Home از سرور پیکربندی شده در <0> تنظیماتDNS </0> استفاده می کند.",
    "tracker_source": "منبع ردیاب",
    "source_label": "منبع",
@ -567,5 +569,6 @@
    "use_saved_key": "از کلید ذخیره شده قبلی استفاده کنید",
    "parental_control": "نظارت والدین",
    "safe_browsing": "وب گردی اَمن",
-    "form_error_password_length": "رمزعبور باید حداقل {{value}} کاراکتر باشد."
+    "form_error_password_length": "رمزعبور باید حداقل {{value}} کاراکتر باشد.",
+    "protection_section_label": "حفاظت"
 }
--- a/client/src/__locales/fi.json
+++ b/client/src/__locales/fi.json
@ -86,7 +86,7 @@
    "request_details": "Pyynnön tiedot",
    "client_details": "Päätelaitteen tiedot",
    "details": "Yksityiskohdat",
-    "back": "Takaisin",
+    "back": "Palaa takaisin",
    "dashboard": "Tila",
    "settings": "Asetukset",
    "filters": "Suodattimet",
@ -146,8 +146,8 @@
    "no_servers_specified": "Palvelimia ei ole määritetty",
    "general_settings": "Yleiset asetukset",
    "dns_settings": "DNS-asetukset",
-    "dns_blocklists": "DNS-estolistat",
-    "dns_allowlists": "DNS-sallittujen listat",
+    "dns_blocklists": "DNS-estot",
+    "dns_allowlists": "DNS-sallinnat",
    "dns_blocklists_desc": "AdGuard Home estää estolistalla olevat verkkotunnukset.",
    "dns_allowlists_desc": "DNS-sallittujen listalla olevat verkkotunnukset sallitaan myös silloin, jos ne ovat jollain muulla estolistalla.",
    "custom_filtering_rules": "Omat suodatussäännöt",
@ -627,7 +627,7 @@
    "cache_optimistic": "Optimistinen välimuisti",
    "cache_optimistic_desc": "Pakota AdGuard Home vastaamaan välimuistista vaikka tiedot olisivat vanhentuneet. Pyri samalla myös päivittämään tiedot.",
    "filter_category_general": "Yleiset",
-    "filter_category_security": "Turvallisuus",
+    "filter_category_security": "Tietoturva",
    "filter_category_regional": "Alueelliset",
    "filter_category_other": "Muut",
    "filter_category_general_desc": "Listat, jotka estävät seurannan ja mainokset useimmilla laitteilla",
--- a/client/src/__locales/no.json
+++ b/client/src/__locales/no.json
@ -282,6 +282,8 @@
    "blocking_mode_null_ip": "Null IP: Svar med en 0-IP-adresse (0.0.0.0 for A; :: for AAAA)",
    "blocking_mode_custom_ip": "Tilpasset IP: Svar med en manuelt valgt IP-adresse",
    "theme_auto": "Auto",
+    "theme_light": "Lyst tema",
+    "theme_dark": "Mørkt tema",
    "upstream_dns_client_desc": "Hvis dette feltet holdes tomt, vil AdGuard Home bruke tjenerne som er satt opp i <0>DNS-innstillingene</0>.",
    "tracker_source": "Sporerkilde",
    "source_label": "Kilde",
--- a/client/src/__locales/pl.json
+++ b/client/src/__locales/pl.json
@ -222,7 +222,7 @@
    "all_lists_up_to_date_toast": "Wszystkie listy są już aktualne",
    "updated_upstream_dns_toast": "Serwery nadrzędne zostały pomyślnie zapisane",
    "dns_test_ok_toast": "Określone serwery DNS działają poprawnie",
-    "dns_test_not_ok_toast": "Serwer \"{{key}}\": nie można go użyć, sprawdź, czy napisałeś go poprawnie",
+    "dns_test_not_ok_toast": "Serwer \"{{key}}\": nie może być użyte, sprawdź, czy zapisano go poprawnie",
    "dns_test_warning_toast": "Upstream \"{{key}}\" nie odpowiada na zapytania testowe i może nie działać prawidłowo",
    "unblock": "Odblokuj",
    "block": "Zablokuj",
@ -346,7 +346,7 @@
    "install_devices_windows_list_2": "Przejdź do kategorii Sieć i Internet, a następnie do Centrum sieci i udostępniania.",
    "install_devices_windows_list_3": "W lewym panelu kliknij \"Zmień ustawienia adaptera\".",
    "install_devices_windows_list_4": "Kliknij prawym przyciskiem myszy aktywne połączenie i wybierz Właściwości.",
-    "install_devices_windows_list_5": "Znajdź na liście \"Protokół internetowy w wersji 4 (TCP/IPv4)\" (lub w przypadku IPv6 \"Protokół internetowy w wersji 6 (TCP/IPv6)\"), zaznacz go i ponownie kliknij na Właściwości.",
+    "install_devices_windows_list_5": "Znajdź na liście \"Protokół internetowy w wersji 4 (TCP/IPv4)\" (lub w przypadku IPv6 \"Protokół internetowy w wersji 6 (TCP/IPv6)\"), zaznacz go i ponownie kliknij Właściwości.",
    "install_devices_windows_list_6": "Wybierz opcję \"Użyj następujących adresów serwerów DNS\" i wprowadź adresy serwerów AdGuard Home.",
    "install_devices_macos_list_1": "Kliknij ikonę Apple i przejdź do Preferencje systemowe.",
    "install_devices_macos_list_2": "Kliknij Sieć.",
@ -396,7 +396,7 @@
    "encryption_issuer": "Zgłaszający",
    "encryption_hostnames": "Nazwy hostów",
    "encryption_reset": "Czy na pewno chcesz zresetować ustawienia szyfrowania?",
-    "encryption_warning": "Uwaga!",
+    "encryption_warning": "Uwaga",
    "topline_expiring_certificate": "Twój certyfikat SSL wkrótce wygaśnie. Zaktualizuj <0>Ustawienia szyfrowania</0>.",
    "topline_expired_certificate": "Twój certyfikat SSL wygasł. Zaktualizuj <0>Ustawienia szyfrowania</0>.",
    "form_error_port_range": "Wpisz numer portu z zakresu 80-65535",
@ -542,7 +542,7 @@
    "password_placeholder": "Wpisz hasło",
    "sign_in": "Zaloguj się",
    "sign_out": "Wyloguj się",
-    "forgot_password": "Zapomniałeś hasła?",
+    "forgot_password": "Zapomniano hasła?",
    "forgot_password_desc": "Wykonaj <0>te kroki</0>, aby utworzyć nowe hasło do konta użytkownika.",
    "location": "Lokalizacja",
    "orgname": "Nazwa firmy",
--- a/client/src/__locales/pt-br.json
+++ b/client/src/__locales/pt-br.json
@ -529,7 +529,7 @@
    "ignore_domains": "Domínios ignorados (separados por nova linha)",
    "ignore_domains_title": "Domínios ignorados",
    "ignore_domains_desc_stats": "As consultas para esses domínios não são gravadas nas estatísticas",
-    "ignore_domains_desc_query": "As consultas para esses domínios não são gravadas no log de consulta",
+    "ignore_domains_desc_query": "As consultas para esses domínios não são gravadas no registro de consulta",
    "interval_hours": "{{count}} hora",
    "interval_hours_plural": "{{count}} horas",
    "filters_configuration": "Configuração de filtros",
--- a/client/src/__locales/uk.json
+++ b/client/src/__locales/uk.json
@ -167,6 +167,7 @@
    "enabled_parental_toast": "«Батьківський контроль» увімкнено",
    "disabled_safe_search_toast": "Безпечний пошук вимкнено",
    "enabled_save_search_toast": "Безпечний пошук увімкнено",
+    "updated_save_search_toast": "Налаштування Безпечного пошуку оновлено",
    "enabled_table_header": "Увімкнено",
    "name_table_header": "Назва",
    "list_url_table_header": "URL списку",
@ -290,6 +291,8 @@
    "rate_limit": "Обмеження швидкості",
    "edns_enable": "Увімкнути відправку EDNS Client Subnet",
    "edns_cs_desc": "Додавати параметр EDNS Client Subnet (ECS) до запитів до upstream-серверів, а також записувати в журнал значення, що надсилаються клієнтами.",
+    "edns_use_custom_ip": "Використання користувацької IP-адреси для EDNS",
+    "edns_use_custom_ip_desc": "Дозволити використовувати користувацьку IP-адресу для EDNS",
    "rate_limit_desc": "Кількість запитів в секунду, які може робити один клієнт. Встановлене значення «0» означатиме необмежену кількість.",
    "blocking_ipv4_desc": "IP-адреса, яку потрібно видати для заблокованого A запиту",
    "blocking_ipv6_desc": "IP-адреса, яку потрібно видати для заблокованого АААА запиту",
@ -523,6 +526,10 @@
    "statistics_retention_confirm": "Ви впевнені, що хочете змінити тривалість статистики? Якщо зменшити значення інтервалу, деякі дані будуть втрачені",
    "statistics_cleared": "Статистику успішно очищено",
    "statistics_enable": "Увімкнути статистику",
+    "ignore_domains": "Ігноровані домени (по одному на рядок)",
+    "ignore_domains_title": "Ігноровані домени",
+    "ignore_domains_desc_stats": "Запити для цих доменів в статистику не пишуться",
+    "ignore_domains_desc_query": "Запити для цих доменів не записуються до журналу запитів",
    "interval_hours": "{{count}} година",
    "interval_hours_plural": "{{count}} годин(и)",
    "filters_configuration": "Конфігурація фільтрів",
@ -643,5 +650,29 @@
    "confirm_dns_cache_clear": "Ви впевнені, що бажаєте очистити кеш DNS?",
    "cache_cleared": "Кеш DNS успішно очищено",
    "clear_cache": "Очистити кеш",
-    "protection_section_label": "Захист"
+    "make_static": "Зробити статичним",
+    "theme_auto_desc": "Автоматична (на основі теми вашого пристрою)",
+    "theme_dark_desc": "Темна тема",
+    "theme_light_desc": "Світла тема",
+    "disable_for_seconds": "На {{count}} секунду",
+    "disable_for_seconds_plural": "На {{count}} секунд",
+    "disable_for_minutes": "На {{count}} хвилину",
+    "disable_for_minutes_plural": "На {{count}} хвилин",
+    "disable_for_hours": "На {{count}} годину",
+    "disable_for_hours_plural": "На {{count}} годин",
+    "disable_until_tomorrow": "До завтра",
+    "disable_notify_for_seconds": "Вимкнення захисту на {{count}} секунду",
+    "disable_notify_for_seconds_plural": "Вимкнення захисту на {{count}} секунд",
+    "disable_notify_for_minutes": "Вимкнення захисту на {{count}} хвилину",
+    "disable_notify_for_minutes_plural": "Вимкнення захисту на {{count}} хвилин",
+    "disable_notify_for_hours": "Вимкнення захисту на {{count}} годину",
+    "disable_notify_for_hours_plural": "Вимкнення захисту на {{count}} годин",
+    "disable_notify_until_tomorrow": "Відключення захисту до завтра",
+    "enable_protection_timer": "Захист буде ввімкнено о {{time}}",
+    "custom_retention_input": "Введіть час в годинах",
+    "custom_rotation_input": "Введіть час в годинах",
+    "protection_section_label": "Захист",
+    "log_and_stats_section_label": "Журнал запитів і статистика",
+    "ignore_query_log": "Ігнорувати цей клієнт у журналі запитів",
+    "ignore_statistics": "Ігноруйте цей клієнт в статистиці"
 }
--- a/client/src/helpers/filters/filters.js
+++ b/client/src/helpers/filters/filters.js
@ -100,6 +100,12 @@ export default {
            "homepage": "https://github.com/DandelionSprout/adfilt",
            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_13.txt"
        },
+        "POL_cert_polska_list_of_malicious_domains": {
+            "name": "POL: CERT Polska List of malicious domains",
+            "categoryId": "regional",
+            "homepage": "https://cert.pl/posts/2020/03/ostrzezenia_phishing/",
+            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_41.txt"
+        },
        "POL_polish_filters_for_pi_hole": {
            "name": "POL: Polish filters for Pi-hole",
            "categoryId": "regional",
@ -118,6 +124,12 @@ export default {
            "homepage": "https://github.com/bkrucarci/turk-adlist",
            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_26.txt"
        },
+        "TUR_turkish_ad_hosts": {
+            "name": "TUR: Turkish Ad Hosts",
+            "categoryId": "regional",
+            "homepage": "https://github.com/symbuzzer/Turkish-Ad-Hosts",
+            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_40.txt"
+        },
        "VNM_abpvn": {
            "name": "VNM: ABPVN List",
            "categoryId": "regional",
@ -214,6 +226,12 @@ export default {
            "homepage": "https://github.com/durablenapkin/scamblocklist",
            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_10.txt"
        },
+        "shadowwhisperers_malware_list": {
+            "name": "ShadowWhisperer's Malware List",
+            "categoryId": "security",
+            "homepage": "https://github.com/ShadowWhisperer/BlockLists",
+            "source": "https://adguardteam.github.io/HostlistsRegistry/assets/filter_42.txt"
+        },
        "staklerware_indicators_list": {
            "name": "Stalkerware Indicators List",
            "categoryId": "security",
--- a/client/src/helpers/trackers/trackers.json
+++ b/client/src/helpers/trackers/trackers.json
@ -1,5 +1,5 @@
 {
-    "timeUpdated": "2023-04-06T10:46:09.881Z",
+    "timeUpdated": "2023-06-01T00:12:12.660Z",
    "categories": {
        "0": "audio_video_player",
        "1": "comments",
@ -19526,6 +19526,13 @@
            "companyId": "qualcomm",
            "source": "AdGuard"
        },
+        "qualcomm_location_service": {
+            "name": "Qualcomm Location Service",
+            "categoryId": 15,
+            "url": "https://www.qualcomm.com/site/privacy/services",
+            "companyId": "qualcomm",
+            "source": "AdGuard"
+        },
        "recaptcha": {
            "name": "reCAPTCHA",
            "categoryId": 8,
@ -19533,6 +19540,55 @@
            "companyId": "google",
            "source": "AdGuard"
        },
+        "samsung": {
+            "name": "Samsung",
+            "categoryId": 8,
+            "url": "https://www.samsung.com/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungads": {
+            "name": "Samsung Ads",
+            "categoryId": 4,
+            "url": "https://www.samsung.com/business/samsungads/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungapps": {
+            "name": "Samsung Apps",
+            "categoryId": 101,
+            "url": "https://www.samsung.com/au/apps/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungmobile": {
+            "name": "Samsung Mobile",
+            "categoryId": 101,
+            "url": "https://www.samsung.com/mobile/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungpush": {
+            "name": "Samsung Push",
+            "categoryId": 8,
+            "url": null,
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungsds": {
+            "name": "Samsung SDS",
+            "categoryId": 10,
+            "url": "https://www.samsungsds.com/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
+        "samsungtv": {
+            "name": "Samsung TV",
+            "categoryId": 15,
+            "url": "https://www.samsung.com/au/tvs/",
+            "companyId": "samsung",
+            "source": "AdGuard"
+        },
        "sectigo": {
            "name": "Sectigo Limited",
            "categoryId": 5,
@ -19589,6 +19645,13 @@
            "companyId": "telstra",
            "source": "AdGuard"
        },
+        "ubuntu": {
+            "name": "Ubuntu",
+            "categoryId": 8,
+            "url": "https://ubuntu.com/",
+            "companyId": "ubuntu",
+            "source": "AdGuard"
+        },
        "unity_ads": {
            "name": "Unity Ads",
            "categoryId": 4,
@ -19651,6 +19714,13 @@
            "url": "https://www.3gpp.org/",
            "companyId": "3gpp",
            "source": "AdGuard"
+        },
+        "7plus": {
+            "name": "7plus",
+            "categoryId": 0,
+            "url": "https://7plus.com.au/",
+            "companyId": "7plus",
+            "source": "AdGuard"
        }
    },
    "trackerDomains": {
@ -19843,8 +19913,8 @@
        "adfreestyle.pl": "adfreestyle",
        "adfront.org": "adfront",
        "adfrontiers.com": "adfrontiers",
-        "adgear.com": "adgear",
-        "adgrx.com": "adgear",
+        "adgear.com": "samsungads",
+        "adgrx.com": "samsungads",
        "adgebra.co.in": "adgebra",
        "adgenie.co.uk": "adgenie",
        "ad.adgile.com": "adgile",
@ -24056,6 +24126,10 @@
        "safebrowsing.g.applimg.com": "apple",
        "applvn.com": "applovin",
        "applovin.com": "applovin",
+        "bitbucket.org": "atlassian.net",
+        "jira.com": "atlassian.net",
+        "ss-inf.net": "atlassian.net",
+        "stspg-customer.com": "statuspage.io",
        "blob.core.windows.net": "azure_blob_storage",
        "azure.com": "azure",
        "trafficmanager.net": "azure",
@ -24063,6 +24137,21 @@
        "mobileapptracking.com": "branch",
        "bttn.io": "button",
        "cloudflare-dns.com": "cloudflare",
+        "cloudflare-dm-cmpimg.com": "cloudflare",
+        "cloudflare-ipfs.com": "cloudflare",
+        "cloudflare-quic.com": "cloudflare",
+        "cloudflare-terms-of-service-abuse.com": "cloudflare",
+        "cloudflare.tv": "cloudflare",
+        "cloudflareaccess.com": "cloudflare",
+        "cloudflareclient.com": "cloudflare",
+        "cloudflareinsights.com": "cloudflare",
+        "cloudflareok.com": "cloudflare",
+        "cloudflareportal.com": "cloudflare",
+        "cloudflareresolve.com": "cloudflare",
+        "cloudflaressl.com": "cloudflare",
+        "cloudflarestatus.com": "cloudflare",
+        "pacloudflare.com": "cloudflare",
+        "sn-cloudflare.com": "cloudflare",
        "crashlytics.com": "crashlytics",
        "phicdn.net": "digicert_trust_seal",
        "domain.glass": "domainglass",
@ -24092,6 +24181,9 @@
        "qy.net": "iqiyi",
        "iqiyi.com": "iqiyi",
        "iq.com": "iqiyi",
+        "ironsrc.com": "ironsource",
+        "ironsrc.net": "ironsource",
+        "supersonicads.com": "ironsource",
        "karambasecurity.com": "karambasecurity",
        "kik.com": "kik",
        "apikik.com": "kik",
@ -24121,6 +24213,23 @@
        "mozilla.com": "mozilla",
        "mozilla.net": "mozilla",
        "mozilla.org": "mozilla",
+        "flxvpn.net": "netflix",
+        "netflix.ca": "netflix",
+        "netflix.com.au": "netflix",
+        "netflix.net": "netflix",
+        "netflixdnstest1.com": "netflix",
+        "netflixdnstest10.com": "netflix",
+        "netflixdnstest2.com": "netflix",
+        "netflixdnstest3.com": "netflix",
+        "netflixdnstest4.com": "netflix",
+        "netflixdnstest5.com": "netflix",
+        "netflixdnstest6.com": "netflix",
+        "netflixdnstest7.com": "netflix",
+        "netflixdnstest8.com": "netflix",
+        "netflixdnstest9.com": "netflix",
+        "netflixinvestor.com": "netflix",
+        "netflixstudios.com": "netflix",
+        "netflixtechblog.com": "netflix",
        "nflximg.com": "netflix",
        "netify.ai": "netify",
        "nab.com": "nab",
@ -24144,9 +24253,69 @@
        "oztam.com.au": "oztam",
        "plex.tv": "plex",
        "plex.direct": "plex",
-        "xtracloud.net": "qualcomm",
        "qualcomm.com": "qualcomm",
+        "gpsonextra.net": "qualcomm_location_service",
+        "izatcloud.net": "qualcomm_location_service",
+        "xtracloud.net": "qualcomm_location_service",
        "recaptcha.net": "recaptcha",
+        "samsungacr.com": "samsungads",
+        "samsungadhub.com": "samsungads",
+        "samsungads.com": "samsungads",
+        "samsungtifa.com": "samsungads",
+        "game-mode.net": "samsung",
+        "gos-gsp.io": "samsung",
+        "lldns.net": "samsung",
+        "pavv.co.kr": "samsung",
+        "remotesamsung.com": "samsung",
+        "samsung-gamelauncher.com": "samsung",
+        "samsung.co.kr": "samsung",
+        "samsung.com": "samsung",
+        "samsung.com.cn": "samsung",
+        "samsungcloud.com": "samsung",
+        "samsungcloudcdn.com": "samsung",
+        "samsungcloudprint.com": "samsung",
+        "samsungcloudsolution.com": "samsung",
+        "samsungcloudsolution.net": "samsung",
+        "samsungelectronics.com": "samsung",
+        "samsunghealth.com": "samsung",
+        "samsungiotcloud.com": "samsung",
+        "samsungknox.com": "samsung",
+        "samsungnyc.com": "samsung",
+        "samsungosp.com": "samsung",
+        "samsungotn.net": "samsung",
+        "samsungpositioning.com": "samsung",
+        "samsungqbe.com": "samsung",
+        "samsungrm.net": "samsung",
+        "samsungrs.com": "samsung",
+        "samsungsemi.com": "samsung",
+        "samsungsetup.com": "samsung",
+        "samsungusa.com": "samsung",
+        "secb2b.com": "samsung",
+        "smartthings.com": "samsung",
+        "ospserver.net": "samsungmobile",
+        "samsungdms.net": "samsungmobile",
+        "samsungmax.com": "samsungmobile",
+        "samsungmobile.com": "samsungmobile",
+        "secmobilesvc.com": "samsungmobile",
+        "internetat.tv": "samsungtv",
+        "samsungcloud.tv": "samsungtv",
+        "samsungsds.com": "samsungsds",
+        "push.samsungosp.com": "samsungpush",
+        "pushmessage.samsung.com": "samsungpush",
+        "scs.samsungqbe.com": "samsungpush",
+        "ssp.samsung.com": "samsungpush",
+        "aibixby.com": "samsungapps",
+        "findmymobile.samsung.com": "samsungapps",
+        "samsapps.cust.lldns.net": "samsungapps",
+        "samsung-omc.com": "samsungapps",
+        "samsungapps.com": "samsungapps",
+        "samsungdiroute.net": "samsungapps",
+        "samsungdive.com": "samsungapps",
+        "samsungdm.com": "samsungapps",
+        "samsungdmroute.com": "samsungapps",
+        "samsungmdec.com": "samsungapps",
+        "samsungvisioncloud.com": "samsungapps",
+        "sbixby.com": "samsungapps",
        "sectigo.com": "sectigo",
        "showrss.info": "showrss",
        "similarweb.io": "similarweb",
@ -24171,6 +24340,13 @@
        "telstra.com.au": "telstra",
        "telstra.com": "telstra",
        "usertrust.com": "trustlogo",
+        "canonical.com": "ubuntu",
+        "launchpad.net": "ubuntu",
+        "launchpadcontent.net": "ubuntu",
+        "snapcraft.io": "ubuntu",
+        "snapcraftcontent.com": "ubuntu",
+        "ubuntu.com": "ubuntu",
+        "ubuntucompanyservices.co.za": "ubuntu",
        "unityads.unity3d.com": "unity_ads",
        "exp-tas.com": "vscode",
        "vscode-unpkg.net": "vscode",
@ -24190,6 +24366,7 @@
        "yandex.kz": "yandex",
        "appmetrica.yandex.com": "yandex_appmetrica",
        "3gppnetwork.org": "3gpp",
-        "3gpp.org": "3gpp"
+        "3gpp.org": "3gpp",
+        "swm.digital": "7plus"
    }
 }
--- a/docker/dns-bind.awk
+++ b/docker/dns-bind.awk
@ -7,11 +7,10 @@
        addrs[$2] = true
        prev_line = FNR

-        if ($2 == "0.0.0.0" || $2 == "::") {
-            delete addrs
-            addrs["localhost"] = true
-
+        if ($2 == "0.0.0.0" || $2 == "'::'") {
            # Drop all the other addresses.
+            delete addrs
+            addrs[""] = true
            prev_line = -1
        }
    }
--- a/docker/healthcheck.sh
+++ b/docker/healthcheck.sh
@ -61,8 +61,11 @@ then
    error_exit "no DNS bindings could be retrieved from $filename"
 fi

+first_dns="$( echo "$dns_hosts" | head -n 1 )"
+readonly first_dns
+
 # TODO(e.burkov):  Deal with 0 port.
-case "$( echo "$dns_hosts" | head -n 1 )"
+case "$first_dns"
 in
 (*':0')
    error_exit '0 in DNS port is not supported by healthcheck'
@ -82,8 +85,23 @@ esac
 # See https://github.com/AdguardTeam/AdGuardHome/issues/5642.
 wget --no-check-certificate "$web_url" -O /dev/null -q || exit 1

+test_fqdn="healthcheck.adguardhome.test."
+readonly test_fqdn
+
+# The awk script currently returns only port prefixed with colon in case of
+# unspecified address.
+case "$first_dns"
+in
+(':'*)
+    nslookup -type=a "$test_fqdn" "127.0.0.1${first_dns}" > /dev/null ||\
+    nslookup -type=a "$test_fqdn" "[::1]${first_dns}" > /dev/null ||\
+        error_exit "nslookup failed for $host"
+    ;;
+(*)
    echo "$dns_hosts" | while read -r host
    do
-    nslookup -type=a healthcheck.adguardhome.test. "$host" > /dev/null ||\
+        nslookup -type=a "$test_fqdn" "$host" > /dev/null ||\
            error_exit "nslookup failed for $host"
    done
+    ;;
+esac
--- a/go.mod
+++ b/go.mod
@ -3,7 +3,7 @@ module github.com/AdguardTeam/AdGuardHome
 go 1.19

 require (
-	github.com/AdguardTeam/dnsproxy v0.48.3
+	github.com/AdguardTeam/dnsproxy v0.50.0
 	github.com/AdguardTeam/golibs v0.13.2
 	github.com/AdguardTeam/urlfilter v0.16.1
 	github.com/NYTimes/gziphandler v1.1.1
@ -16,24 +16,24 @@ require (
 	github.com/google/gopacket v1.1.19
 	github.com/google/renameio v1.0.1
 	github.com/google/uuid v1.3.0
-	github.com/insomniacslk/dhcp v0.0.0-20221215072855-de60144f33f8
+	github.com/insomniacslk/dhcp v0.0.0-20230516061539-49801966e6cb
 	github.com/josharian/native v1.1.1-0.20230202152459-5c7d0dd6ab86
 	github.com/kardianos/service v1.2.2
 	github.com/mdlayher/ethernet v0.0.0-20220221185849-529eae5b6118
-	github.com/mdlayher/netlink v1.7.1
-	github.com/mdlayher/packet v1.1.1
+	github.com/mdlayher/netlink v1.7.2
+	github.com/mdlayher/packet v1.1.2
 	// TODO(a.garipov): This package is deprecated; find a new one or use our
 	// own code for that.  Perhaps, use gopacket.
 	github.com/mdlayher/raw v0.1.0
-	github.com/miekg/dns v1.1.53
-	github.com/quic-go/quic-go v0.33.0
+	github.com/miekg/dns v1.1.54
+	github.com/quic-go/quic-go v0.35.1
 	github.com/stretchr/testify v1.8.2
 	github.com/ti-mo/netfilter v0.5.0
 	go.etcd.io/bbolt v1.3.7
-	golang.org/x/crypto v0.8.0
-	golang.org/x/exp v0.0.0-20230321023759-10a507213a29
-	golang.org/x/net v0.9.0
-	golang.org/x/sys v0.7.0
+	golang.org/x/crypto v0.9.0
+	golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1
+	golang.org/x/net v0.10.0
+	golang.org/x/sys v0.8.0
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1
 	gopkg.in/yaml.v3 v3.0.1
 	howett.net/plist v1.0.0
@ -48,9 +48,9 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/golang/mock v1.6.0 // indirect
-	github.com/google/pprof v0.0.0-20230406165453-00490a63f317 // indirect
-	github.com/mdlayher/socket v0.4.0 // indirect
-	github.com/onsi/ginkgo/v2 v2.9.2 // indirect
+	github.com/google/pprof v0.0.0-20230602150820-91b7bce49751 // indirect
+	github.com/mdlayher/socket v0.4.1 // indirect
+	github.com/onsi/ginkgo/v2 v2.10.0 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/pierrec/lz4/v4 v4.1.17 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
@ -60,7 +60,7 @@ require (
 	github.com/quic-go/qtls-go1-20 v0.2.2 // indirect
 	github.com/u-root/uio v0.0.0-20230305220412-3e8cd9d6bf63 // indirect
 	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/sync v0.1.0 // indirect
+	golang.org/x/sync v0.2.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
-	golang.org/x/tools v0.8.0 // indirect
+	golang.org/x/tools v0.9.3 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,5 +1,5 @@
-github.com/AdguardTeam/dnsproxy v0.48.3 h1:h9xgDSmd1MqsPFNApyaPVXolmSTtzOWOcfWvPeDEP6s=
-github.com/AdguardTeam/dnsproxy v0.48.3/go.mod h1:Y7g7jRTd/u7+KJ/QvnGI2PCE8vnisp6EsW47/Sz0DZw=
+github.com/AdguardTeam/dnsproxy v0.50.0 h1:gqImxUMBVS8VQmGdXw0U7MjJNVzXkYaZ9NM5TKl3JBU=
+github.com/AdguardTeam/dnsproxy v0.50.0/go.mod h1:CQhZTkqC8X0ID6glrtyaxgqRRdiYfn1gJulC1cZ5Dn8=
 github.com/AdguardTeam/golibs v0.4.0/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4=
 github.com/AdguardTeam/golibs v0.10.4/go.mod h1:rSfQRGHIdgfxriDDNgNJ7HmE5zRoURq8R+VdR81Zuzw=
 github.com/AdguardTeam/golibs v0.13.2 h1:BPASsyQKmb+b8VnvsNOHp7bKfcZl9Z+Z2UhPjOiupSc=
@ -31,10 +31,9 @@ github.com/digineo/go-ipset/v2 v2.2.1 h1:k6skY+0fMqeUjjeWO/m5OuWPSZUAn7AucHMnQ1M
 github.com/digineo/go-ipset/v2 v2.2.1/go.mod h1:wBsNzJlZlABHUITkesrggFnZQtgW5wkqw1uo8Qxe0VU=
 github.com/dimfeld/httptreemux/v5 v5.5.0 h1:p8jkiMrCuZ0CmhwYLcbNbl7DDo21fozhKHQ2PccwOFQ=
 github.com/dimfeld/httptreemux/v5 v5.5.0/go.mod h1:QeEylH57C0v3VO0tkKraVz9oD3Uu93CKPnTLbsidvSw=
-github.com/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:PjfxuH4FZdUyfMdtBio2lsRr1AKEaVPwelzuHuh8Lqc=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
 github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
-github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
+github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
 github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY=
 github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-ping/ping v1.1.0 h1:3MCGhVX4fyEUuhsfwPrsEdQw6xspHkv5zHsiSoDFZYw=
@ -45,72 +44,54 @@ github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
 github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs=
 github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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@ -127,12 +108,10 @@ github.com/quic-go/qtls-go1-19 v0.3.2 h1:tFxjCFcTQzK+oMxG6Zcvp4Dq8dx4yD3dDiIiyc8
 github.com/quic-go/qtls-go1-19 v0.3.2/go.mod h1:ySOI96ew8lnoKPtSqx2BlI5wCpUVPT05RMAlajtnyOI=
 github.com/quic-go/qtls-go1-20 v0.2.2 h1:WLOPx6OY/hxtTxKV1Zrq20FtXtDEkeY00CGQm8GEa3E=
 github.com/quic-go/qtls-go1-20 v0.2.2/go.mod h1:JKtK6mjbAVcUTN/9jZpvLbGxvdWIKS8uT7EiStoU1SM=
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 github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
@ -152,7 +131,6 @@ github.com/tklauser/go-sysconf v0.3.9 h1:JeUVdAOWhhxVcU6Eqr/ATFHgXk/mmiItdKeJPev
 github.com/tklauser/go-sysconf v0.3.9/go.mod h1:11DU/5sG7UexIrp/O6g35hrWzu0JxlwQ3LSFUzyeuhs=
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 github.com/tklauser/numcpus v0.3.0/go.mod h1:yFGUr7TUHQRAhyqBcEg0Ge34zDBAsIvJJcyE6boqnA8=
-github.com/u-root/uio v0.0.0-20221213070652-c3537552635f/go.mod h1:IogEAUBXDEwX7oR/BMmCctShYs80ql4hF0ySdzGxf7E=
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 github.com/u-root/uio v0.0.0-20230305220412-3e8cd9d6bf63/go.mod h1:eLL9Nub3yfAho7qB0MzZizFhTU2QkLeoVsWdHtDW264=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
@ -160,11 +138,10 @@ go.etcd.io/bbolt v1.3.7 h1:j+zJOnnEjF/kyHlDDgGnVL/AIqIJPq8UoB2GSNfkUfQ=
 go.etcd.io/bbolt v1.3.7/go.mod h1:N9Mkw9X8x5fupy0IKsmuqVtoGDyxsaDlbk4Rd05IAQw=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.8.0 h1:pd9TJtTueMTVQXzk8E2XESSMQDj/U7OUu0PqJqPXQjQ=
-golang.org/x/crypto v0.8.0/go.mod h1:mRqEX+O9/h5TFCrQhkgjo2yKi0yYA+9ecGkdQoHrywE=
-golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
-golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
+golang.org/x/crypto v0.9.0 h1:LF6fAI+IutBocDJ2OT0Q1g8plpYljMZ4+lty+dsqw3g=
+golang.org/x/crypto v0.9.0/go.mod h1:yrmDGqONDYtNj3tH8X9dzUun2m2lzPa9ngI6/RUPGR0=
+golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 h1:k/i9J1pBpvlfR+9QsetwPyERsqu1GIbi967PQMq3Ivc=
+golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1/go.mod h1:V1LtkGg67GoY2N1AnLN78QLrzxkLyJw7RJb1gzOOz9w=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@ -172,40 +149,25 @@ golang.org/x/mod v0.10.0 h1:lFO9qtOdlre5W1jxS3r/4szv2/6iXxScdzjoBMXNhYk=
 golang.org/x/mod v0.10.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190419010253-1f3472d942ba/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20191007182048-72f939374954/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20201010224723-4f7140c49acb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210929193557-e81a3d93ecf6/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
-golang.org/x/net v0.9.0/go.mod h1:d48xBJpPfHeWQsugry2m+kC02ZBRGRgulfHnEXEuWns=
+golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
+golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
-golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
+golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190322080309-f49334f85ddc/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190411185658-b44545bcd369/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190418153312-f0ce4c0180be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190606122018-79a91cf218c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201101102859-da207088b7d1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@ -219,8 +181,8 @@ golang.org/x/sys v0.0.0-20220209214540-3681064d5158/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220622161953-175b2fd9d664/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.4.1-0.20230131160137-e7d7f63158de/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
-golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
@ -230,12 +192,11 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.8.0 h1:vSDcovVPld282ceKgDimkRSC8kpaH1dgyc9UMzlt84Y=
-golang.org/x/tools v0.8.0/go.mod h1:JxBZ99ISMI5ViVkT1tr6tdNmXeTrcpVSD3vZ1RsRdN4=
+golang.org/x/tools v0.9.3 h1:Gn1I8+64MsuTb/HpH+LmQtNas23LhUVr3rYZ0eKuaMM=
+golang.org/x/tools v0.9.3/go.mod h1:owI94Op576fPu3cIGQeHs3joujW/2Oc6MtlxbF5dfNc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
--- a/internal/aghhttp/aghhttp.go
+++ b/internal/aghhttp/aghhttp.go
@ -72,8 +72,8 @@ func WriteJSONResponse(w http.ResponseWriter, r *http.Request, resp any) (err er
 // WriteJSONResponseCode is like [WriteJSONResponse] but adds the ability to
 // redefine the status code.
 func WriteJSONResponseCode(w http.ResponseWriter, r *http.Request, code int, resp any) (err error) {
-	w.WriteHeader(code)
 	w.Header().Set(httphdr.ContentType, HdrValApplicationJSON)
+	w.WriteHeader(code)
 	err = json.NewEncoder(w).Encode(resp)
 	if err != nil {
 		Error(r, w, http.StatusInternalServerError, "encoding resp: %s", err)
--- a/internal/aghnet/dhcp_unix.go
+++ b/internal/aghnet/dhcp_unix.go
@ -304,7 +304,7 @@ func tryConn6(req *dhcpv6.Message, c net.PacketConn) (ok, next bool, err error)
 	if !(response.Type() == dhcpv6.MessageTypeAdvertise &&
 		msg.TransactionID == req.TransactionID &&
 		rcid != nil &&
-		cid.Equal(*rcid)) {
+		cid.Equal(rcid)) {

 		log.Debug("dhcpv6: received message from server doesn't match our request")

--- a/internal/aghos/service.go
+++ b/internal/aghos/service.go
@ -0,0 +1,6 @@
+package aghos
+
+// PreCheckActionStart performs the service start action pre-check.
+func PreCheckActionStart() (err error) {
+	return preCheckActionStart()
+}
--- a/internal/aghos/service_darwin.go
+++ b/internal/aghos/service_darwin.go
@ -0,0 +1,32 @@
+//go:build darwin
+
+package aghos
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/AdguardTeam/golibs/log"
+)
+
+// preCheckActionStart performs the service start action pre-check.  It warns
+// user that the service should be installed into Applications directory.
+func preCheckActionStart() (err error) {
+	exe, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("getting executable path: %v", err)
+	}
+
+	exe, err = filepath.EvalSymlinks(exe)
+	if err != nil {
+		return fmt.Errorf("evaluating executable symlinks: %v", err)
+	}
+
+	if !strings.HasPrefix(exe, "/Applications/") {
+		log.Info("warning: service must be started from within the /Applications directory")
+	}
+
+	return err
+}
--- a/internal/aghos/service_others.go
+++ b/internal/aghos/service_others.go
@ -0,0 +1,8 @@
+//go:build !darwin
+
+package aghos
+
+// preCheckActionStart performs the service start action pre-check.
+func preCheckActionStart() (err error) {
+	return nil
+}
--- a/internal/dhcpd/README.md
+++ b/internal/dhcpd/README.md
@ -1,46 +1,60 @@
-# DHCP server
+ #  Testing DHCP Server

 Contents:
 *  [Test setup with Virtual Box](#vbox)
+ *  [Quick test with DHCPTest](#dhcptest)

-<a id="vbox"></a>
-## Test setup with Virtual Box
+##  <a href="#vbox" id="vbox" name="vbox">Test setup with Virtual Box</a>

-To set up a test environment for DHCP server you need:
+   ### Prerequisites

-* Linux host machine
-* Virtual Box
-* Virtual machine (guest OS doesn't matter)
+To set up a test environment for DHCP server you will need:

-### Configure client
+ *  Linux AG Home host machine (Virtual).
+ *  Virtual Box.
+ *  Virtual machine (guest OS doesn't matter).

-1. Install Virtual Box and run the following command to create a Host-Only network:
+   ### Configure Virtual Box

+ 1.  Install Virtual Box and run the following command to create a Host-Only 
+     network:
+
+     ```sh
     $ VBoxManage hostonlyif create
+     ```
     
     You can check its status by `ip a` command.  

     You can also set up Host-Only network using Virtual Box menu: 
     
+     ```
     File -> Host Network Manager...
+     ```

 2.  Create your virtual machine and set up its network:

+     ```
     VM Settings -> Network -> Host-only Adapter
+     ```

-3. Start your VM, install an OS.  Configure your network interface to use DHCP and the OS should ask for a IP address from our DHCP server.
+ 3.  Start your VM, install an OS.  Configure your network interface to use
+     DHCP and the OS should ask for a IP address from our DHCP server.

-4. To see the current IP address on client OS you can use `ip a` command on Linux or `ipconfig` on Windows.
+ 4.  To see the current IP addresses on client OS you can use `ip a` command on
+     Linux or `ipconfig` on Windows.

-5. To force the client OS to request an IP from DHCP server again, you can use `dhclient` on Linux or `ipconfig /release` on Windows.
+ 5.  To force the client OS to request an IP from DHCP server again, you can
+     use `dhclient` on Linux or `ipconfig /release` on Windows.

   ### Configure server

-1. Edit server configuration file 'AdGuardHome.yaml', for example:
+ 1.  Edit server configuration file `AdGuardHome.yaml`, for example:

+     ```yaml
     dhcp:
          enabled: true
          interface_name: vboxnet0
+          local_domain_name: lan
          dhcpv4:
            gateway_ip: 192.168.56.1
            subnet_mask: 255.255.255.0
@ -54,11 +68,29 @@ To set up a test environment for DHCP server you need:
            lease_duration: 86400
            ra_slaac_only: false
            ra_allow_slaac: false
+     ```

 2.  Start the server

-        ./AdGuardHome
+     ```sh
+     ./AdGuardHome -v
+     ```

     There should be a message in log which shows that DHCP server is ready:

+     ```
     [info] DHCP: listening on 0.0.0.0:67
+     ```
+
+##  <a href="#dhcptest" id="dhcptest" name="dhcptest">Quick test with DHCPTest utility</a>
+
+   ### Prerequisites
+
+ *  [DHCP test utility][dhcptest-gh].
+
+   ### Quick test
+
+The DHCP server could be tested for DISCOVER-OFFER packets with in
+interactive mode.
+
+[dhcptest-gh]: https://github.com/CyberShadow/dhcptest
--- a/internal/dhcpd/conn_darwin.go
+++ b/internal/dhcpd/conn_darwin.go
@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin || freebsd || openbsd

 package dhcpd

--- a/internal/dhcpd/conn_darwin_internal_test.go
+++ b/internal/dhcpd/conn_darwin_internal_test.go
@ -1,4 +1,4 @@
-//go:build darwin
+//go:build darwin || freebsd || openbsd

 package dhcpd

--- a/internal/dhcpd/conn_linux.go
+++ b/internal/dhcpd/conn_linux.go
@ -1,4 +1,4 @@
-//go:build freebsd || linux || openbsd
+//go:build linux

 package dhcpd

--- a/internal/dhcpd/conn_linux_internal_test.go
+++ b/internal/dhcpd/conn_linux_internal_test.go
@ -1,4 +1,4 @@
-//go:build freebsd || linux || openbsd
+//go:build linux

 package dhcpd

--- a/internal/dhcpd/dhcpd.go
+++ b/internal/dhcpd/dhcpd.go
@ -239,36 +239,16 @@ func Create(conf *ServerConfig) (s *server, err error) {
 	// [aghhttp.RegisterFunc].
 	s.registerHandlers()

-	v4conf := conf.Conf4
-	v4conf.InterfaceName = s.conf.InterfaceName
-	v4conf.notify = s.onNotify
-	v4conf.Enabled = s.conf.Enabled && v4conf.RangeStart.IsValid()
-
-	s.srv4, err = v4Create(&v4conf)
+	v4Enabled, v6Enabled, err := s.setServers(conf)
 	if err != nil {
-		if v4conf.Enabled {
-			return nil, fmt.Errorf("creating dhcpv4 srv: %w", err)
-		}
-
-		log.Debug("dhcpd: warning: creating dhcpv4 srv: %s", err)
-	}
-
-	v6conf := conf.Conf6
-	v6conf.Enabled = s.conf.Enabled
-	if len(v6conf.RangeStart) == 0 {
-		v6conf.Enabled = false
-	}
-	v6conf.InterfaceName = s.conf.InterfaceName
-	v6conf.notify = s.onNotify
-	s.srv6, err = v6Create(v6conf)
-	if err != nil {
-		return nil, fmt.Errorf("creating dhcpv6 srv: %w", err)
+		// Don't wrap the error, because it's informative enough as is.
+		return nil, err
 	}

 	s.conf.Conf4 = conf.Conf4
 	s.conf.Conf6 = conf.Conf6

-	if s.conf.Enabled && !v4conf.Enabled && !v6conf.Enabled {
+	if s.conf.Enabled && !v4Enabled && !v6Enabled {
 		return nil, fmt.Errorf("neither dhcpv4 nor dhcpv6 srv is configured")
 	}

@ -289,6 +269,39 @@ func Create(conf *ServerConfig) (s *server, err error) {
 	return s, nil
 }

+// setServers updates DHCPv4 and DHCPv6 servers created from the provided
+// configuration conf.
+func (s *server) setServers(conf *ServerConfig) (v4Enabled, v6Enabled bool, err error) {
+	v4conf := conf.Conf4
+	v4conf.InterfaceName = s.conf.InterfaceName
+	v4conf.notify = s.onNotify
+	v4conf.Enabled = s.conf.Enabled && v4conf.RangeStart.IsValid()
+
+	s.srv4, err = v4Create(&v4conf)
+	if err != nil {
+		if v4conf.Enabled {
+			return true, false, fmt.Errorf("creating dhcpv4 srv: %w", err)
+		}
+
+		log.Debug("dhcpd: warning: creating dhcpv4 srv: %s", err)
+	}
+
+	v6conf := conf.Conf6
+	v6conf.InterfaceName = s.conf.InterfaceName
+	v6conf.notify = s.onNotify
+	v6conf.Enabled = s.conf.Enabled
+	if len(v6conf.RangeStart) == 0 {
+		v6conf.Enabled = false
+	}
+
+	s.srv6, err = v6Create(v6conf)
+	if err != nil {
+		return v4conf.Enabled, v6conf.Enabled, fmt.Errorf("creating dhcpv6 srv: %w", err)
+	}
+
+	return v4conf.Enabled, v6conf.Enabled, nil
+}
+
 // Enabled returns true when the server is enabled.
 func (s *server) Enabled() (ok bool) {
 	return s.conf.Enabled
--- a/internal/dhcpd/http_unix.go
+++ b/internal/dhcpd/http_unix.go
@ -16,6 +16,7 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
+	"github.com/AdguardTeam/golibs/netutil"
 )

 type v4ServerConfJSON struct {
@ -263,6 +264,28 @@ func (s *server) handleDHCPSetConfigV6(
 	return srv6, enabled, err
 }

+// createServers returns DHCPv4 and DHCPv6 servers created from the provided
+// configuration conf.
+func (s *server) createServers(conf *dhcpServerConfigJSON) (srv4, srv6 DHCPServer, err error) {
+	srv4, v4Enabled, err := s.handleDHCPSetConfigV4(conf)
+	if err != nil {
+		return nil, nil, fmt.Errorf("bad dhcpv4 configuration: %s", err)
+	}
+
+	srv6, v6Enabled, err := s.handleDHCPSetConfigV6(conf)
+	if err != nil {
+		return nil, nil, fmt.Errorf("bad dhcpv6 configuration: %s", err)
+	}
+
+	if conf.Enabled == aghalg.NBTrue && !v4Enabled && !v6Enabled {
+		return nil, nil, fmt.Errorf("dhcpv4 or dhcpv6 configuration must be complete")
+	}
+
+	return srv4, srv6, nil
+}
+
+// handleDHCPSetConfig is the handler for the POST /control/dhcp/set_config
+// HTTP API.
 func (s *server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 	conf := &dhcpServerConfigJSON{}
 	conf.Enabled = aghalg.BoolToNullBool(s.conf.Enabled)
@ -275,22 +298,9 @@ func (s *server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	srv4, v4Enabled, err := s.handleDHCPSetConfigV4(conf)
+	srv4, srv6, err := s.createServers(conf)
 	if err != nil {
-		aghhttp.Error(r, w, http.StatusBadRequest, "bad dhcpv4 configuration: %s", err)
-
-		return
-	}
-
-	srv6, v6Enabled, err := s.handleDHCPSetConfigV6(conf)
-	if err != nil {
-		aghhttp.Error(r, w, http.StatusBadRequest, "bad dhcpv6 configuration: %s", err)
-
-		return
-	}
-
-	if conf.Enabled == aghalg.NBTrue && !v4Enabled && !v6Enabled {
-		aghhttp.Error(r, w, http.StatusBadRequest, "dhcpv4 or dhcpv6 configuration must be complete")
+		aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)

 		return
 	}
@ -350,8 +360,10 @@ type netInterfaceJSON struct {
 	Addrs6       []netip.Addr `json:"ipv6_addresses"`
 }

+// handleDHCPInterfaces is the handler for the GET /control/dhcp/interfaces
+// HTTP API.
 func (s *server) handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
-	response := map[string]netInterfaceJSON{}
+	resp := map[string]*netInterfaceJSON{}

 	ifaces, err := net.Interfaces()
 	if err != nil {
@ -362,82 +374,86 @@ func (s *server) handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {

 	for _, iface := range ifaces {
 		if iface.Flags&net.FlagLoopback != 0 {
-			// it's a loopback, skip it
-			continue
-		}
-		if iface.Flags&net.FlagBroadcast == 0 {
-			// this interface doesn't support broadcast, skip it
+			// It's a loopback, skip it.
 			continue
 		}

-		var addrs []net.Addr
-		addrs, err = iface.Addrs()
-		if err != nil {
-			aghhttp.Error(
-				r,
-				w,
-				http.StatusInternalServerError,
-				"Failed to get addresses for interface %s: %s",
-				iface.Name,
-				err,
-			)
+		if iface.Flags&net.FlagBroadcast == 0 {
+			// This interface doesn't support broadcast, skip it.
+			continue
+		}
+
+		jsonIface, iErr := newNetInterfaceJSON(iface)
+		if iErr != nil {
+			aghhttp.Error(r, w, http.StatusInternalServerError, "%s", iErr)

 			return
 		}

-		jsonIface := netInterfaceJSON{
+		if jsonIface != nil {
+			resp[iface.Name] = jsonIface
+		}
+	}
+
+	_ = aghhttp.WriteJSONResponse(w, r, resp)
+}
+
+// newNetInterfaceJSON creates a JSON object from a [net.Interface] iface.
+func newNetInterfaceJSON(iface net.Interface) (out *netInterfaceJSON, err error) {
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return nil, fmt.Errorf(
+			"failed to get addresses for interface %s: %s",
+			iface.Name,
+			err,
+		)
+	}
+
+	out = &netInterfaceJSON{
 		Name:         iface.Name,
 		HardwareAddr: iface.HardwareAddr.String(),
 	}

 	if iface.Flags != 0 {
-			jsonIface.Flags = iface.Flags.String()
+		out.Flags = iface.Flags.String()
 	}
-		// we don't want link-local addresses in json, so skip them
-		for _, addr := range addrs {
-			ipnet, ok := addr.(*net.IPNet)
-			if !ok {
-				// not an IPNet, should not happen
-				aghhttp.Error(
-					r,
-					w,
-					http.StatusInternalServerError,
-					"got iface.Addrs() element %[1]s that is not net.IPNet, it is %[1]T",
-					addr)

-				return
+	// We don't want link-local addresses in JSON, so skip them.
+	for _, addr := range addrs {
+		ipNet, ok := addr.(*net.IPNet)
+		if !ok {
+			// Not an IPNet, should not happen.
+			return nil, fmt.Errorf("got iface.Addrs() element %[1]s that is not"+
+				" net.IPNet, it is %[1]T", addr)
 		}
-			// ignore link-local
+
+		// Ignore link-local.
 		//
 		// TODO(e.burkov):  Try to listen DHCP on LLA as well.
-			if ipnet.IP.IsLinkLocalUnicast() {
+		if ipNet.IP.IsLinkLocalUnicast() {
 			continue
 		}

-			if ip4 := ipnet.IP.To4(); ip4 != nil {
-				addr := netip.AddrFrom4(*(*[4]byte)(ip4))
-				jsonIface.Addrs4 = append(jsonIface.Addrs4, addr)
+		vAddr, iErr := netutil.IPToAddrNoMapped(ipNet.IP)
+		if iErr != nil {
+			// Not an IPNet, should not happen.
+			return nil, fmt.Errorf("failed to convert IP address %[1]s: %w", addr, iErr)
+		}
+
+		if vAddr.Is4() {
+			out.Addrs4 = append(out.Addrs4, vAddr)
 		} else {
-				addr := netip.AddrFrom16(*(*[16]byte)(ipnet.IP))
-				jsonIface.Addrs6 = append(jsonIface.Addrs6, addr)
-			}
-		}
-		if len(jsonIface.Addrs4)+len(jsonIface.Addrs6) != 0 {
-			jsonIface.GatewayIP = aghnet.GatewayIP(iface.Name)
-			response[iface.Name] = jsonIface
+			out.Addrs6 = append(out.Addrs6, vAddr)
 		}
 	}

-	err = json.NewEncoder(w).Encode(response)
-	if err != nil {
-		aghhttp.Error(
-			r,
-			w,
-			http.StatusInternalServerError,
-			"Failed to marshal json with available interfaces: %s",
-			err,
-		)
+	if len(out.Addrs4)+len(out.Addrs6) == 0 {
+		return nil, nil
 	}
+
+	out.GatewayIP = aghnet.GatewayIP(iface.Name)
+
+	return out, nil
 }

 // dhcpSearchOtherResult contains information about other DHCP server for
--- a/internal/dhcpd/routeradv.go
+++ b/internal/dhcpd/routeradv.go
@ -7,6 +7,7 @@ import (
 	"sync/atomic"
 	"time"

+	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/netutil"
 	"golang.org/x/net/icmp"
@ -195,7 +196,7 @@ func createICMPv6RAPacket(params icmpv6RA) (data []byte, err error) {
 	return data, nil
 }

-// Init - initialize RA module
+// Init initializes RA module.
 func (ra *raCtx) Init() (err error) {
 	ra.stop.Store(0)
 	ra.conn = nil
@ -203,8 +204,7 @@ func (ra *raCtx) Init() (err error) {
 		return nil
 	}

-	log.Debug("dhcpv6 ra: source IP address: %s  DNS IP address: %s",
-		ra.ipAddr, ra.dnsIPAddr)
+	log.Debug("dhcpv6 ra: source IP address: %s  DNS IP address: %s", ra.ipAddr, ra.dnsIPAddr)

 	params := icmpv6RA{
 		managedAddressConfiguration: !ra.raSLAACOnly,
@ -223,18 +223,15 @@ func (ra *raCtx) Init() (err error) {
 		return fmt.Errorf("creating packet: %w", err)
 	}

-	success := false
 	ipAndScope := ra.ipAddr.String() + "%" + ra.ifaceName
 	ra.conn, err = icmp.ListenPacket("ip6:ipv6-icmp", ipAndScope)
 	if err != nil {
 		return fmt.Errorf("dhcpv6 ra: icmp.ListenPacket: %w", err)
 	}
+
 	defer func() {
-		if !success {
-			derr := ra.Close()
-			if derr != nil {
-				log.Error("closing context: %s", derr)
-			}
+		if err != nil {
+			err = errors.WithDeferred(err, ra.Close())
 		}
 	}()

@ -269,7 +266,6 @@ func (ra *raCtx) Init() (err error) {
 		log.Debug("dhcpv6 ra: loop exit")
 	}()

-	success = true
 	return nil
 }

--- a/internal/dhcpd/v4_unix.go
+++ b/internal/dhcpd/v4_unix.go
@ -342,8 +342,8 @@ func (s *v4Server) rmLease(lease *Lease) (err error) {
 // server to be configured and it's not.
 const ErrUnconfigured errors.Error = "server is unconfigured"

-// AddStaticLease implements the DHCPServer interface for *v4Server.  It is safe
-// for concurrent use.
+// AddStaticLease implements the DHCPServer interface for *v4Server.  It is
+// safe for concurrent use.
 func (s *v4Server) AddStaticLease(l *Lease) (err error) {
 	defer func() { err = errors.Annotate(err, "dhcpv4: adding static lease: %w") }()

@ -354,21 +354,23 @@ func (s *v4Server) AddStaticLease(l *Lease) (err error) {
 	l.IP = l.IP.Unmap()

 	if !l.IP.Is4() {
-		return fmt.Errorf("invalid ip %q, only ipv4 is supported", l.IP)
+		return fmt.Errorf("invalid IP %q: only IPv4 is supported", l.IP)
 	} else if gwIP := s.conf.GatewayIP; gwIP == l.IP {
-		return fmt.Errorf("can't assign the gateway IP %s to the lease", gwIP)
+		return fmt.Errorf("can't assign the gateway IP %q to the lease", gwIP)
 	}

 	l.IsStatic = true

 	err = netutil.ValidateMAC(l.HWAddr)
 	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
 		return err
 	}

 	if hostname := l.Hostname; hostname != "" {
 		hostname, err = normalizeHostname(hostname)
 		if err != nil {
+			// Don't wrap the error, because it's informative enough as is.
 			return err
 		}

@ -386,32 +388,9 @@ func (s *v4Server) AddStaticLease(l *Lease) (err error) {
 		l.Hostname = hostname
 	}

-	// Perform the following actions in an anonymous function to make sure
-	// that the lock gets unlocked before the notification step.
-	func() {
-		s.leasesLock.Lock()
-		defer s.leasesLock.Unlock()
-
-		err = s.rmDynamicLease(l)
-		if err != nil {
-			err = fmt.Errorf(
-				"removing dynamic leases for %s (%s): %w",
-				l.IP,
-				l.HWAddr,
-				err,
-			)
-
-			return
-		}
-
-		err = s.addLease(l)
-		if err != nil {
-			err = fmt.Errorf("adding static lease for %s (%s): %w", l.IP, l.HWAddr, err)
-
-			return
-		}
-	}()
+	err = s.updateStaticLease(l)
 	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
 		return err
 	}

@ -421,6 +400,25 @@ func (s *v4Server) AddStaticLease(l *Lease) (err error) {
 	return nil
 }

+// updateStaticLease safe removes dynamic lease with the same properties and
+// then adds a static lease l.
+func (s *v4Server) updateStaticLease(l *Lease) (err error) {
+	s.leasesLock.Lock()
+	defer s.leasesLock.Unlock()
+
+	err = s.rmDynamicLease(l)
+	if err != nil {
+		return fmt.Errorf("removing dynamic leases for %s (%s): %w", l.IP, l.HWAddr, err)
+	}
+
+	err = s.addLease(l)
+	if err != nil {
+		return fmt.Errorf("adding static lease for %s (%s): %w", l.IP, l.HWAddr, err)
+	}
+
+	return nil
+}
+
 // RemoveStaticLease removes a static lease.  It is safe for concurrent use.
 func (s *v4Server) RemoveStaticLease(l *Lease) (err error) {
 	defer func() { err = errors.Annotate(err, "dhcpv4: %w") }()
@ -894,24 +892,9 @@ func (s *v4Server) handleDecline(req, resp *dhcpv4.DHCPv4) (err error) {
 		reqIP = req.ClientIPAddr
 	}

-	netIP, ok := netip.AddrFromSlice(reqIP)
-	if !ok {
-		log.Info("dhcpv4: invalid IP: %s", reqIP)
-
-		return nil
-	}
-
-	var oldLease *Lease
-	for _, l := range s.leases {
-		if bytes.Equal(l.HWAddr, mac) && l.IP == netIP {
-			oldLease = l
-
-			break
-		}
-	}
-
+	oldLease := s.findLeaseForIP(reqIP, mac)
 	if oldLease == nil {
-		log.Info("dhcpv4: lease with ip %s for %s not found", reqIP, mac)
+		log.Info("dhcpv4: lease with IP %s for %s not found", reqIP, mac)

 		return nil
 	}
@ -925,7 +908,7 @@ func (s *v4Server) handleDecline(req, resp *dhcpv4.DHCPv4) (err error) {
 	if err != nil {
 		return fmt.Errorf("allocating new lease for %s: %w", mac, err)
 	} else if newLease == nil {
-		log.Info("dhcpv4: allocating new lease for %s: no more ip addresses", mac)
+		log.Info("dhcpv4: allocating new lease for %s: no more IP addresses", mac)

 		resp.YourIPAddr = make([]byte, 4)
 		resp.UpdateOption(dhcpv4.OptMessageType(dhcpv4.MessageTypeAck))
@ -941,15 +924,32 @@ func (s *v4Server) handleDecline(req, resp *dhcpv4.DHCPv4) (err error) {
 		return fmt.Errorf("adding new lease for %s: %w", mac, err)
 	}

-	log.Info("dhcpv4: changed ip from %s to %s for %s", reqIP, newLease.IP, mac)
-
-	resp.YourIPAddr = net.IP(newLease.IP.AsSlice())
+	log.Info("dhcpv4: changed IP from %s to %s for %s", reqIP, newLease.IP, mac)

+	resp.YourIPAddr = newLease.IP.AsSlice()
 	resp.UpdateOption(dhcpv4.OptMessageType(dhcpv4.MessageTypeAck))

 	return nil
 }

+// findLeaseForIP returns a lease for provided ip and mac.
+func (s *v4Server) findLeaseForIP(ip net.IP, mac net.HardwareAddr) (l *Lease) {
+	netIP, ok := netip.AddrFromSlice(ip)
+	if !ok {
+		log.Info("dhcpv4: invalid IP: %s", ip)
+
+		return nil
+	}
+
+	for _, il := range s.leases {
+		if bytes.Equal(il.HWAddr, mac) && il.IP == netIP {
+			return il
+		}
+	}
+
+	return nil
+}
+
 // handleRelease is the handler for the DHCP Release request.
 func (s *v4Server) handleRelease(req, resp *dhcpv4.DHCPv4) (err error) {
 	mac := req.ClientHWAddr
@ -995,11 +995,80 @@ func (s *v4Server) handleRelease(req, resp *dhcpv4.DHCPv4) (err error) {
 	return nil
 }

-// Find a lease associated with MAC and prepare response
-// Return 1: OK
-// Return 0: error; reply with Nak
-// Return -1: error; don't reply
-func (s *v4Server) handle(req, resp *dhcpv4.DHCPv4) int {
+// messageHandler describes a DHCPv4 message handler function.
+type messageHandler func(s *v4Server, req, resp *dhcpv4.DHCPv4) (rCode int, l *Lease, err error)
+
+// messageHandlers is a map of handlers for various messages with message types
+// keys.
+var messageHandlers = map[dhcpv4.MessageType]messageHandler{
+	dhcpv4.MessageTypeDiscover: func(
+		s *v4Server,
+		req *dhcpv4.DHCPv4,
+		resp *dhcpv4.DHCPv4,
+	) (rCode int, l *Lease, err error) {
+		l, err = s.handleDiscover(req, resp)
+		if err != nil {
+			return 0, nil, fmt.Errorf("handling discover: %s", err)
+		}
+
+		if l == nil {
+			return 0, nil, nil
+		}
+
+		return 1, l, nil
+	},
+	dhcpv4.MessageTypeRequest: func(
+		s *v4Server,
+		req *dhcpv4.DHCPv4,
+		resp *dhcpv4.DHCPv4,
+	) (rCode int, l *Lease, err error) {
+		var toReply bool
+		l, toReply = s.handleRequest(req, resp)
+		if l == nil {
+			if toReply {
+				return 0, nil, nil
+			}
+
+			// Drop the packet.
+			return -1, nil, nil
+		}
+
+		return 1, l, nil
+	},
+	dhcpv4.MessageTypeDecline: func(
+		s *v4Server,
+		req *dhcpv4.DHCPv4,
+		resp *dhcpv4.DHCPv4,
+	) (rCode int, l *Lease, err error) {
+		err = s.handleDecline(req, resp)
+		if err != nil {
+			return 0, nil, fmt.Errorf("handling decline: %s", err)
+		}
+
+		return 1, nil, nil
+	},
+	dhcpv4.MessageTypeRelease: func(
+		s *v4Server,
+		req *dhcpv4.DHCPv4,
+		resp *dhcpv4.DHCPv4,
+	) (rCode int, l *Lease, err error) {
+		err = s.handleRelease(req, resp)
+		if err != nil {
+			return 0, nil, fmt.Errorf("handling release: %s", err)
+		}
+
+		return 1, nil, nil
+	},
+}
+
+// handle processes request, it finds a lease associated with MAC address and
+// prepares response.
+//
+// Possible return values are:
+//   - "1": OK,
+//   - "0": error, reply with Nak,
+//   - "-1": error, don't reply.
+func (s *v4Server) handle(req, resp *dhcpv4.DHCPv4) (rCode int) {
 	var err error

 	// Include server's identifier option since any reply should contain it.
@ -1007,47 +1076,26 @@ func (s *v4Server) handle(req, resp *dhcpv4.DHCPv4) int {
 	// See https://datatracker.ietf.org/doc/html/rfc2131#page-29.
 	resp.UpdateOption(dhcpv4.OptServerIdentifier(s.conf.dnsIPAddrs[0].AsSlice()))

-	// TODO(a.garipov): Refactor this into handlers.
-	var l *Lease
-	switch mt := req.MessageType(); mt {
-	case dhcpv4.MessageTypeDiscover:
-		l, err = s.handleDiscover(req, resp)
+	handler := messageHandlers[req.MessageType()]
+	if handler == nil {
+		s.updateOptions(req, resp)
+
+		return 1
+	}
+
+	rCode, l, err := handler(s, req, resp)
 	if err != nil {
-			log.Error("dhcpv4: handling discover: %s", err)
+		log.Error("dhcpv4: %s", err)

 		return 0
 	}

-		if l == nil {
-			return 0
-		}
-	case dhcpv4.MessageTypeRequest:
-		var toReply bool
-		l, toReply = s.handleRequest(req, resp)
-		if l == nil {
-			if toReply {
-				return 0
-			}
-			return -1 // drop packet
-		}
-	case dhcpv4.MessageTypeDecline:
-		err = s.handleDecline(req, resp)
-		if err != nil {
-			log.Error("dhcpv4: handling decline: %s", err)
-
-			return 0
-		}
-	case dhcpv4.MessageTypeRelease:
-		err = s.handleRelease(req, resp)
-		if err != nil {
-			log.Error("dhcpv4: handling release: %s", err)
-
-			return 0
-		}
+	if rCode != 1 {
+		return rCode
 	}

 	if l != nil {
-		resp.YourIPAddr = net.IP(l.IP.AsSlice())
+		resp.YourIPAddr = l.IP.AsSlice()
 	}

 	s.updateOptions(req, resp)
@ -1162,23 +1210,8 @@ func (s *v4Server) Start() (err error) {
 		// No available IP addresses which may appear later.
 		return nil
 	}
-	// Update the value of Domain Name Server option separately from others if
-	// not assigned yet since its value is available only at server's start.
-	//
-	// TODO(e.burkov):  Initialize as implicit option with the rest of default
-	// options when it will be possible to do before the call to Start.
-	if !s.explicitOpts.Has(dhcpv4.OptionDomainNameServer) {
-		s.implicitOpts.Update(dhcpv4.OptDNS(dnsIPAddrs...))
-	}

-	for _, ip := range dnsIPAddrs {
-		ip = ip.To4()
-		if ip == nil {
-			continue
-		}
-
-		s.conf.dnsIPAddrs = append(s.conf.dnsIPAddrs, netip.AddrFrom4(*(*[4]byte)(ip)))
-	}
+	s.configureDNSIPAddrs(dnsIPAddrs)

 	var c net.PacketConn
 	if c, err = s.newDHCPConn(iface); err != nil {
@ -1199,10 +1232,10 @@ func (s *v4Server) Start() (err error) {
 	log.Info("dhcpv4: listening")

 	go func() {
-		if serr := s.srv.Serve(); errors.Is(serr, net.ErrClosed) {
+		if sErr := s.srv.Serve(); errors.Is(sErr, net.ErrClosed) {
 			log.Info("dhcpv4: server is closed")
-		} else if serr != nil {
-			log.Error("dhcpv4: srv.Serve: %s", serr)
+		} else if sErr != nil {
+			log.Error("dhcpv4: srv.Serve: %s", sErr)
 		}
 	}()

@ -1213,6 +1246,28 @@ func (s *v4Server) Start() (err error) {
 	return nil
 }

+// configureDNSIPAddrs updates v4Server configuration with provided slice of
+// dns IP addresses.
+func (s *v4Server) configureDNSIPAddrs(dnsIPAddrs []net.IP) {
+	// Update the value of Domain Name Server option separately from others if
+	// not assigned yet since its value is available only at server's start.
+	//
+	// TODO(e.burkov):  Initialize as implicit option with the rest of default
+	// options when it will be possible to do before the call to Start.
+	if !s.explicitOpts.Has(dhcpv4.OptionDomainNameServer) {
+		s.implicitOpts.Update(dhcpv4.OptDNS(dnsIPAddrs...))
+	}
+
+	for _, ip := range dnsIPAddrs {
+		vAddr, err := netutil.IPToAddr(ip, netutil.AddrFamilyIPv4)
+		if err != nil {
+			continue
+		}
+
+		s.conf.dnsIPAddrs = append(s.conf.dnsIPAddrs, vAddr)
+	}
+}
+
 // Stop - stop server
 func (s *v4Server) Stop() (err error) {
 	if s.srv == nil {
--- a/internal/dhcpd/v4_unix_test.go
+++ b/internal/dhcpd/v4_unix_test.go
@ -227,7 +227,7 @@ func TestV4Server_AddRemove_static(t *testing.T) {
 		},
 		name: "with_gateway_ip",
 		wantErrMsg: "dhcpv4: adding static lease: " +
-			"can't assign the gateway IP 192.168.10.1 to the lease",
+			`can't assign the gateway IP "192.168.10.1" to the lease`,
 	}, {
 		lease: &Lease{
 			Hostname: "ip6.local",
@ -236,7 +236,7 @@ func TestV4Server_AddRemove_static(t *testing.T) {
 		},
 		name: "ipv6",
 		wantErrMsg: `dhcpv4: adding static lease: ` +
-			`invalid ip "ffff::1", only ipv4 is supported`,
+			`invalid IP "ffff::1": only IPv4 is supported`,
 	}, {
 		lease: &Lease{
 			Hostname: "bad-mac.local",
--- a/internal/dhcpd/v6_unix.go
+++ b/internal/dhcpd/v6_unix.go
@ -30,7 +30,7 @@ type v6Server struct {
 	leasesLock sync.Mutex
 	leases     []*Lease
 	ipAddrs    [256]byte
-	sid        dhcpv6.Duid
+	sid        dhcpv6.DUID

 	ra raCtx // RA module

@ -586,9 +586,31 @@ func (s *v6Server) packetHandler(conn net.PacketConn, peer net.Addr, req dhcpv6.
 	}
 }

-// initialize RA module
-func (s *v6Server) initRA(iface *net.Interface) error {
-	// choose the source IP address - should be link-local-unicast
+// configureDNSIPAddrs updates v6Server configuration with the slice of DNS IP
+// addresses of provided interface iface.  Initializes RA module.
+func (s *v6Server) configureDNSIPAddrs(iface *net.Interface) (ok bool, err error) {
+	dnsIPAddrs, err := aghnet.IfaceDNSIPAddrs(
+		iface,
+		aghnet.IPVersion6,
+		defaultMaxAttempts,
+		defaultBackoff,
+	)
+	if err != nil {
+		return false, fmt.Errorf("interface %s: %w", iface.Name, err)
+	}
+
+	if len(dnsIPAddrs) == 0 {
+		return false, nil
+	}
+
+	s.conf.dnsIPAddrs = dnsIPAddrs
+
+	return true, s.initRA(iface)
+}
+
+// initRA initializes RA module.
+func (s *v6Server) initRA(iface *net.Interface) (err error) {
+	// Choose the source IP address - should be link-local-unicast.
 	s.ra.ipAddr = s.conf.dnsIPAddrs[0]
 	for _, ip := range s.conf.dnsIPAddrs {
 		if ip.IsLinkLocalUnicast() {
@ -604,6 +626,7 @@ func (s *v6Server) initRA(iface *net.Interface) error {
 	s.ra.ifaceName = s.conf.InterfaceName
 	s.ra.iface = iface
 	s.ra.packetSendPeriod = 1 * time.Second
+
 	return s.ra.Init()
 }

@ -623,63 +646,47 @@ func (s *v6Server) Start() (err error) {

 	log.Debug("dhcpv6: starting...")

-	dnsIPAddrs, err := aghnet.IfaceDNSIPAddrs(
-		iface,
-		aghnet.IPVersion6,
-		defaultMaxAttempts,
-		defaultBackoff,
-	)
+	ok, err := s.configureDNSIPAddrs(iface)
 	if err != nil {
-		return fmt.Errorf("interface %s: %w", ifaceName, err)
+		// Don't wrap the error, because it's informative enough as is.
+		return err
 	}

-	if len(dnsIPAddrs) == 0 {
+	if !ok {
 		// No available IP addresses which may appear later.
 		return nil
 	}

-	s.conf.dnsIPAddrs = dnsIPAddrs
-
-	err = s.initRA(iface)
-	if err != nil {
-		return err
-	}
-
-	// don't initialize DHCPv6 server if we must force the clients to use SLAAC
+	// Don't initialize DHCPv6 server if we must force the clients to use SLAAC.
 	if s.conf.RASLAACOnly {
 		log.Debug("not starting dhcpv6 server due to ra_slaac_only=true")

 		return nil
 	}

-	log.Debug("dhcpv6: listening...")
-
 	err = netutil.ValidateMAC(iface.HardwareAddr)
 	if err != nil {
 		return fmt.Errorf("validating interface %s: %w", iface.Name, err)
 	}

-	s.sid = dhcpv6.Duid{
-		Type:          dhcpv6.DUID_LLT,
-		HwType:        iana.HWTypeEthernet,
+	s.sid = &dhcpv6.DUIDLLT{
+		HWType:        iana.HWTypeEthernet,
 		LinkLayerAddr: iface.HardwareAddr,
 		Time:          dhcpv6.GetTime(),
 	}

-	laddr := &net.UDPAddr{
-		IP:   net.ParseIP("::"),
-		Port: dhcpv6.DefaultServerPort,
-	}
-	s.srv, err = server6.NewServer(iface.Name, laddr, s.packetHandler, server6.WithDebugLogger())
+	s.srv, err = server6.NewServer(iface.Name, nil, s.packetHandler, server6.WithDebugLogger())
 	if err != nil {
 		return err
 	}

+	log.Debug("dhcpv6: listening...")
+
 	go func() {
-		if serr := s.srv.Serve(); errors.Is(serr, net.ErrClosed) {
+		if sErr := s.srv.Serve(); errors.Is(sErr, net.ErrClosed) {
 			log.Info("dhcpv6: server is closed")
-		} else if serr != nil {
-			log.Error("dhcpv6: srv.Serve: %s", serr)
+		} else if sErr != nil {
+			log.Error("dhcpv6: srv.Serve: %s", sErr)
 		}
 	}()

--- a/internal/dhcpd/v6_unix_test.go
+++ b/internal/dhcpd/v6_unix_test.go
@ -121,9 +121,8 @@ func TestV6GetLease(t *testing.T) {

 	dnsAddr := net.ParseIP("2000::1")
 	s.conf.dnsIPAddrs = []net.IP{dnsAddr}
-	s.sid = dhcpv6.Duid{
-		Type:          dhcpv6.DUID_LLT,
-		HwType:        iana.HWTypeEthernet,
+	s.sid = &dhcpv6.DUIDLL{
+		HWType:        iana.HWTypeEthernet,
 		LinkLayerAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
 	}

@ -216,9 +215,8 @@ func TestV6GetDynamicLease(t *testing.T) {

 	dnsAddr := net.ParseIP("2000::1")
 	s.conf.dnsIPAddrs = []net.IP{dnsAddr}
-	s.sid = dhcpv6.Duid{
-		Type:          dhcpv6.DUID_LLT,
-		HwType:        iana.HWTypeEthernet,
+	s.sid = &dhcpv6.DUIDLL{
+		HWType:        iana.HWTypeEthernet,
 		LinkLayerAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
 	}

--- a/internal/dnsforward/dnsforward_test.go
+++ b/internal/dnsforward/dnsforward_test.go
@ -23,6 +23,7 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
+	"github.com/AdguardTeam/AdGuardHome/internal/filtering/hashprefix"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering/safesearch"
 	"github.com/AdguardTeam/dnsproxy/proxy"
 	"github.com/AdguardTeam/dnsproxy/upstream"
@ -915,13 +916,23 @@ func TestBlockedByHosts(t *testing.T) {
 }

 func TestBlockedBySafeBrowsing(t *testing.T) {
-	const hostname = "wmconvirus.narod.ru"
+	const (
+		hostname  = "wmconvirus.narod.ru"
+		cacheTime = 10 * time.Minute
+		cacheSize = 10000
+	)
+
+	sbChecker := hashprefix.New(&hashprefix.Config{
+		CacheTime: cacheTime,
+		CacheSize: cacheSize,
+		Upstream:  aghtest.NewBlockUpstream(hostname, true),
+	})

-	sbUps := aghtest.NewBlockUpstream(hostname, true)
 	ans4, _ := (&aghtest.TestResolver{}).HostToIPs(hostname)

 	filterConf := &filtering.Config{
 		SafeBrowsingEnabled: true,
+		SafeBrowsingChecker: sbChecker,
 	}
 	forwardConf := ServerConfig{
 		UDPListenAddrs: []*net.UDPAddr{{}},
@ -935,7 +946,6 @@ func TestBlockedBySafeBrowsing(t *testing.T) {
 		},
 	}
 	s := createTestServer(t, filterConf, forwardConf, nil)
-	s.dnsFilter.SetSafeBrowsingUpstream(sbUps)
 	startDeferStop(t, s)
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP)

--- a/internal/dnsforward/http_test.go
+++ b/internal/dnsforward/http_test.go
@ -205,8 +205,8 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
 		wantSet: `validating upstream servers: validating upstream "!!!": not an ip:port`,
 	}, {
 		name: "bootstraps_bad",
-		wantSet: `checking bootstrap a: invalid address: ` +
-			`Resolver a is not eligible to be a bootstrap DNS server`,
+		wantSet: `checking bootstrap a: invalid address: bootstrap a:53: ` +
+			`ParseAddr("a"): unable to parse IP`,
 	}, {
 		name:    "cache_bad_ttl",
 		wantSet: `cache_ttl_min must be less or equal than cache_ttl_max`,
@ -487,7 +487,8 @@ func TestServer_handleTestUpstreaDNS(t *testing.T) {
 		},
 		wantResp: map[string]any{
 			badUps: `upstream "` + badUps + `" fails to exchange: ` +
-				`couldn't communicate with upstream: dns: id mismatch`,
+				`couldn't communicate with upstream: exchanging with ` +
+				badUps + ` over tcp: dns: id mismatch`,
 		},
 		name: "broken",
 	}, {
@ -497,7 +498,8 @@ func TestServer_handleTestUpstreaDNS(t *testing.T) {
 		wantResp: map[string]any{
 			goodUps: "OK",
 			badUps: `upstream "` + badUps + `" fails to exchange: ` +
-				`couldn't communicate with upstream: dns: id mismatch`,
+				`couldn't communicate with upstream: exchanging with ` +
+				badUps + ` over tcp: dns: id mismatch`,
 		},
 		name: "both",
 	}}
--- a/internal/filtering/filtering.go
+++ b/internal/filtering/filtering.go
@ -18,8 +18,6 @@ import (

 	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
-	"github.com/AdguardTeam/dnsproxy/upstream"
-	"github.com/AdguardTeam/golibs/cache"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/mathutil"
@ -75,6 +73,12 @@ type Resolver interface {

 // Config allows you to configure DNS filtering with New() or just change variables directly.
 type Config struct {
+	// SafeBrowsingChecker is the safe browsing hash-prefix checker.
+	SafeBrowsingChecker Checker `yaml:"-"`
+
+	// ParentControl is the parental control hash-prefix checker.
+	ParentalControlChecker Checker `yaml:"-"`
+
 	// enabled is used to be returned within Settings.
 	//
 	// It is of type uint32 to be accessed by atomic.
@ -158,8 +162,22 @@ type hostChecker struct {
 	name  string
 }

+// Checker is used for safe browsing or parental control hash-prefix filtering.
+type Checker interface {
+	// Check returns true if request for the host should be blocked.
+	Check(host string) (block bool, err error)
+}
+
 // DNSFilter matches hostnames and DNS requests against filtering rules.
 type DNSFilter struct {
+	safeSearch SafeSearch
+
+	// safeBrowsingChecker is the safe browsing hash-prefix checker.
+	safeBrowsingChecker Checker
+
+	// parentalControl is the parental control hash-prefix checker.
+	parentalControlChecker Checker
+
 	rulesStorage    *filterlist.RuleStorage
 	filteringEngine *urlfilter.DNSEngine

@ -168,14 +186,6 @@ type DNSFilter struct {

 	engineLock sync.RWMutex

-	parentalServer       string // access via methods
-	safeBrowsingServer   string // access via methods
-	parentalUpstream     upstream.Upstream
-	safeBrowsingUpstream upstream.Upstream
-
-	safebrowsingCache cache.Cache
-	parentalCache     cache.Cache
-
 	Config // for direct access by library users, even a = assignment
 	// confLock protects Config.
 	confLock sync.RWMutex
@ -192,7 +202,6 @@ type DNSFilter struct {
 	// TODO(e.burkov):  Don't use regexp for such a simple text processing task.
 	filterTitleRegexp *regexp.Regexp

-	safeSearch   SafeSearch
 	hostCheckers []hostChecker
 }

@ -942,17 +951,10 @@ func New(c *Config, blockFilters []Filter) (d *DNSFilter, err error) {
 	d = &DNSFilter{
 		refreshLock:            &sync.Mutex{},
 		filterTitleRegexp:      regexp.MustCompile(`^! Title: +(.*)$`),
+		safeBrowsingChecker:    c.SafeBrowsingChecker,
+		parentalControlChecker: c.ParentalControlChecker,
 	}

-	d.safebrowsingCache = cache.New(cache.Config{
-		EnableLRU: true,
-		MaxSize:   c.SafeBrowsingCacheSize,
-	})
-	d.parentalCache = cache.New(cache.Config{
-		EnableLRU: true,
-		MaxSize:   c.ParentalCacheSize,
-	})
-
 	d.safeSearch = c.SafeSearch

 	d.hostCheckers = []hostChecker{{
@ -977,11 +979,6 @@ func New(c *Config, blockFilters []Filter) (d *DNSFilter, err error) {

 	defer func() { err = errors.Annotate(err, "filtering: %w") }()

-	err = d.initSecurityServices()
-	if err != nil {
-		return nil, fmt.Errorf("initializing services: %s", err)
-	}
-
 	d.Config = *c
 	d.filtersMu = &sync.RWMutex{}

@ -1038,3 +1035,69 @@ func (d *DNSFilter) Start() {
 	// So for now we just start this periodic task from here.
 	go d.periodicallyRefreshFilters()
 }
+
+// Safe browsing and parental control methods.
+
+// TODO(a.garipov): Unify with checkParental.
+func (d *DNSFilter) checkSafeBrowsing(
+	host string,
+	_ uint16,
+	setts *Settings,
+) (res Result, err error) {
+	if !setts.ProtectionEnabled || !setts.SafeBrowsingEnabled {
+		return Result{}, nil
+	}
+
+	if log.GetLevel() >= log.DEBUG {
+		timer := log.StartTimer()
+		defer timer.LogElapsed("safebrowsing lookup for %q", host)
+	}
+
+	res = Result{
+		Rules: []*ResultRule{{
+			Text:         "adguard-malware-shavar",
+			FilterListID: SafeBrowsingListID,
+		}},
+		Reason:     FilteredSafeBrowsing,
+		IsFiltered: true,
+	}
+
+	block, err := d.safeBrowsingChecker.Check(host)
+	if !block || err != nil {
+		return Result{}, err
+	}
+
+	return res, nil
+}
+
+// TODO(a.garipov): Unify with checkSafeBrowsing.
+func (d *DNSFilter) checkParental(
+	host string,
+	_ uint16,
+	setts *Settings,
+) (res Result, err error) {
+	if !setts.ProtectionEnabled || !setts.ParentalEnabled {
+		return Result{}, nil
+	}
+
+	if log.GetLevel() >= log.DEBUG {
+		timer := log.StartTimer()
+		defer timer.LogElapsed("parental lookup for %q", host)
+	}
+
+	res = Result{
+		Rules: []*ResultRule{{
+			Text:         "parental CATEGORY_BLACKLISTED",
+			FilterListID: ParentalListID,
+		}},
+		Reason:     FilteredParental,
+		IsFiltered: true,
+	}
+
+	block, err := d.parentalControlChecker.Check(host)
+	if !block || err != nil {
+		return Result{}, err
+	}
+
+	return res, nil
+}
--- a/internal/filtering/filtering_test.go
+++ b/internal/filtering/filtering_test.go
@ -7,7 +7,7 @@ import (
 	"testing"

 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
-	"github.com/AdguardTeam/golibs/cache"
+	"github.com/AdguardTeam/AdGuardHome/internal/filtering/hashprefix"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/AdguardTeam/urlfilter/rules"
@ -27,17 +27,6 @@ const (

 // Helpers.

-func purgeCaches(d *DNSFilter) {
-	for _, c := range []cache.Cache{
-		d.safebrowsingCache,
-		d.parentalCache,
-	} {
-		if c != nil {
-			c.Clear()
-		}
-	}
-}
-
 func newForTest(t testing.TB, c *Config, filters []Filter) (f *DNSFilter, setts *Settings) {
 	setts = &Settings{
 		ProtectionEnabled: true,
@ -58,11 +47,17 @@ func newForTest(t testing.TB, c *Config, filters []Filter) (f *DNSFilter, setts
 	f, err := New(c, filters)
 	require.NoError(t, err)

-	purgeCaches(f)
-
 	return f, setts
 }

+func newChecker(host string) Checker {
+	return hashprefix.New(&hashprefix.Config{
+		CacheTime: 10,
+		CacheSize: 100000,
+		Upstream:  aghtest.NewBlockUpstream(host, true),
+	})
+}
+
 func (d *DNSFilter) checkMatch(t *testing.T, hostname string, setts *Settings) {
 	t.Helper()

@ -175,10 +170,14 @@ func TestSafeBrowsing(t *testing.T) {
 	aghtest.ReplaceLogWriter(t, logOutput)
 	aghtest.ReplaceLogLevel(t, log.DEBUG)

-	d, setts := newForTest(t, &Config{SafeBrowsingEnabled: true}, nil)
+	sbChecker := newChecker(sbBlocked)
+
+	d, setts := newForTest(t, &Config{
+		SafeBrowsingEnabled: true,
+		SafeBrowsingChecker: sbChecker,
+	}, nil)
 	t.Cleanup(d.Close)

-	d.SetSafeBrowsingUpstream(aghtest.NewBlockUpstream(sbBlocked, true))
 	d.checkMatch(t, sbBlocked, setts)

 	require.Contains(t, logOutput.String(), fmt.Sprintf("safebrowsing lookup for %q", sbBlocked))
@ -188,18 +187,17 @@ func TestSafeBrowsing(t *testing.T) {
 	d.checkMatchEmpty(t, pcBlocked, setts)

 	// Cached result.
-	d.safeBrowsingServer = "127.0.0.1"
 	d.checkMatch(t, sbBlocked, setts)
 	d.checkMatchEmpty(t, pcBlocked, setts)
-	d.safeBrowsingServer = defaultSafebrowsingServer
 }

 func TestParallelSB(t *testing.T) {
-	d, setts := newForTest(t, &Config{SafeBrowsingEnabled: true}, nil)
+	d, setts := newForTest(t, &Config{
+		SafeBrowsingEnabled: true,
+		SafeBrowsingChecker: newChecker(sbBlocked),
+	}, nil)
 	t.Cleanup(d.Close)

-	d.SetSafeBrowsingUpstream(aghtest.NewBlockUpstream(sbBlocked, true))
-
 	t.Run("group", func(t *testing.T) {
 		for i := 0; i < 100; i++ {
 			t.Run(fmt.Sprintf("aaa%d", i), func(t *testing.T) {
@ -220,10 +218,12 @@ func TestParentalControl(t *testing.T) {
 	aghtest.ReplaceLogWriter(t, logOutput)
 	aghtest.ReplaceLogLevel(t, log.DEBUG)

-	d, setts := newForTest(t, &Config{ParentalEnabled: true}, nil)
+	d, setts := newForTest(t, &Config{
+		ParentalEnabled:        true,
+		ParentalControlChecker: newChecker(pcBlocked),
+	}, nil)
 	t.Cleanup(d.Close)

-	d.SetParentalUpstream(aghtest.NewBlockUpstream(pcBlocked, true))
 	d.checkMatch(t, pcBlocked, setts)
 	require.Contains(t, logOutput.String(), fmt.Sprintf("parental lookup for %q", pcBlocked))

@ -233,7 +233,6 @@ func TestParentalControl(t *testing.T) {
 	d.checkMatchEmpty(t, "api.jquery.com", setts)

 	// Test cached result.
-	d.parentalServer = "127.0.0.1"
 	d.checkMatch(t, pcBlocked, setts)
 	d.checkMatchEmpty(t, "yandex.ru", setts)
 }
@ -595,6 +594,8 @@ func TestClientSettings(t *testing.T) {
 		&Config{
 			ParentalEnabled:        true,
 			SafeBrowsingEnabled:    false,
+			SafeBrowsingChecker:    newChecker(sbBlocked),
+			ParentalControlChecker: newChecker(pcBlocked),
 		},
 		[]Filter{{
 			ID: 0, Data: []byte("||example.org^\n"),
@ -602,9 +603,6 @@ func TestClientSettings(t *testing.T) {
 	)
 	t.Cleanup(d.Close)

-	d.SetParentalUpstream(aghtest.NewBlockUpstream(pcBlocked, true))
-	d.SetSafeBrowsingUpstream(aghtest.NewBlockUpstream(sbBlocked, true))
-
 	type testCase struct {
 		name       string
 		host       string
@ -665,11 +663,12 @@ func TestClientSettings(t *testing.T) {
 // Benchmarks.

 func BenchmarkSafeBrowsing(b *testing.B) {
-	d, setts := newForTest(b, &Config{SafeBrowsingEnabled: true}, nil)
+	d, setts := newForTest(b, &Config{
+		SafeBrowsingEnabled: true,
+		SafeBrowsingChecker: newChecker(sbBlocked),
+	}, nil)
 	b.Cleanup(d.Close)

-	d.SetSafeBrowsingUpstream(aghtest.NewBlockUpstream(sbBlocked, true))
-
 	for n := 0; n < b.N; n++ {
 		res, err := d.CheckHost(sbBlocked, dns.TypeA, setts)
 		require.NoError(b, err)
@ -679,11 +678,12 @@ func BenchmarkSafeBrowsing(b *testing.B) {
 }

 func BenchmarkSafeBrowsingParallel(b *testing.B) {
-	d, setts := newForTest(b, &Config{SafeBrowsingEnabled: true}, nil)
+	d, setts := newForTest(b, &Config{
+		SafeBrowsingEnabled: true,
+		SafeBrowsingChecker: newChecker(sbBlocked),
+	}, nil)
 	b.Cleanup(d.Close)

-	d.SetSafeBrowsingUpstream(aghtest.NewBlockUpstream(sbBlocked, true))
-
 	b.RunParallel(func(pb *testing.PB) {
 		for pb.Next() {
 			res, err := d.CheckHost(sbBlocked, dns.TypeA, setts)
--- a/internal/filtering/hashprefix/cache.go
+++ b/internal/filtering/hashprefix/cache.go
@ -0,0 +1,130 @@
+package hashprefix
+
+import (
+	"encoding/binary"
+	"time"
+
+	"github.com/AdguardTeam/golibs/log"
+)
+
+// expirySize is the size of expiry in cacheItem.
+const expirySize = 8
+
+// cacheItem represents an item that we will store in the cache.
+type cacheItem struct {
+	// expiry is the time when cacheItem will expire.
+	expiry time.Time
+
+	// hashes is the hashed hostnames.
+	hashes []hostnameHash
+}
+
+// toCacheItem decodes cacheItem from data.  data must be at least equal to
+// expiry size.
+func toCacheItem(data []byte) *cacheItem {
+	t := time.Unix(int64(binary.BigEndian.Uint64(data)), 0)
+
+	data = data[expirySize:]
+	hashes := make([]hostnameHash, len(data)/hashSize)
+
+	for i := 0; i < len(data); i += hashSize {
+		var hash hostnameHash
+		copy(hash[:], data[i:i+hashSize])
+		hashes = append(hashes, hash)
+	}
+
+	return &cacheItem{
+		expiry: t,
+		hashes: hashes,
+	}
+}
+
+// fromCacheItem encodes cacheItem into data.
+func fromCacheItem(item *cacheItem) (data []byte) {
+	data = make([]byte, len(item.hashes)*hashSize+expirySize)
+	expiry := item.expiry.Unix()
+	binary.BigEndian.PutUint64(data[:expirySize], uint64(expiry))
+
+	for _, v := range item.hashes {
+		// nolint:looppointer // The subsilce is used for a copy.
+		data = append(data, v[:]...)
+	}
+
+	return data
+}
+
+// findInCache finds hashes in the cache.  If nothing found returns list of
+// hashes, prefixes of which will be sent to upstream.
+func (c *Checker) findInCache(
+	hashes []hostnameHash,
+) (found, blocked bool, hashesToRequest []hostnameHash) {
+	now := time.Now()
+
+	i := 0
+	for _, hash := range hashes {
+		// nolint:looppointer // The subsilce is used for a safe cache lookup.
+		data := c.cache.Get(hash[:prefixLen])
+		if data == nil {
+			hashes[i] = hash
+			i++
+
+			continue
+		}
+
+		item := toCacheItem(data)
+		if now.After(item.expiry) {
+			hashes[i] = hash
+			i++
+
+			continue
+		}
+
+		if ok := findMatch(hashes, item.hashes); ok {
+			return true, true, nil
+		}
+	}
+
+	if i == 0 {
+		return true, false, nil
+	}
+
+	return false, false, hashes[:i]
+}
+
+// storeInCache caches hashes.
+func (c *Checker) storeInCache(hashesToRequest, respHashes []hostnameHash) {
+	hashToStore := make(map[prefix][]hostnameHash)
+
+	for _, hash := range respHashes {
+		var pref prefix
+		// nolint:looppointer // The subsilce is used for a copy.
+		copy(pref[:], hash[:])
+
+		hashToStore[pref] = append(hashToStore[pref], hash)
+	}
+
+	for pref, hash := range hashToStore {
+		// nolint:looppointer // The subsilce is used for a safe cache lookup.
+		c.setCache(pref[:], hash)
+	}
+
+	for _, hash := range hashesToRequest {
+		// nolint:looppointer // The subsilce is used for a safe cache lookup.
+		pref := hash[:prefixLen]
+		val := c.cache.Get(pref)
+		if val == nil {
+			c.setCache(pref, nil)
+		}
+	}
+}
+
+// setCache stores hash in cache.
+func (c *Checker) setCache(pref []byte, hashes []hostnameHash) {
+	item := &cacheItem{
+		expiry: time.Now().Add(c.cacheTime),
+		hashes: hashes,
+	}
+
+	c.cache.Set(pref, fromCacheItem(item))
+	log.Debug("%s: stored in cache: %v", c.svc, pref)
+}
--- a/internal/filtering/hashprefix/hashprefix.go
+++ b/internal/filtering/hashprefix/hashprefix.go
@ -0,0 +1,245 @@
+// Package hashprefix used for safe browsing and parent control.
+package hashprefix
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/AdguardTeam/dnsproxy/upstream"
+	"github.com/AdguardTeam/golibs/cache"
+	"github.com/AdguardTeam/golibs/log"
+	"github.com/AdguardTeam/golibs/netutil"
+	"github.com/AdguardTeam/golibs/stringutil"
+	"github.com/miekg/dns"
+	"golang.org/x/exp/slices"
+	"golang.org/x/net/publicsuffix"
+)
+
+const (
+	// prefixLen is the length of the hash prefix of the filtered hostname.
+	prefixLen = 2
+
+	// hashSize is the size of hashed hostname.
+	hashSize = sha256.Size
+
+	// hexSize is the size of hexadecimal representation of hashed hostname.
+	hexSize = hashSize * 2
+)
+
+// prefix is the type of the SHA256 hash prefix used to match against the
+// domain-name database.
+type prefix [prefixLen]byte
+
+// hostnameHash is the hashed hostname.
+//
+// TODO(s.chzhen):  Split into prefix and suffix.
+type hostnameHash [hashSize]byte
+
+// findMatch returns true if one of the a hostnames matches one of the b.
+func findMatch(a, b []hostnameHash) (matched bool) {
+	for _, hash := range a {
+		if slices.Contains(b, hash) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Config is the configuration structure for safe browsing and parental
+// control.
+type Config struct {
+	// Upstream is the upstream DNS server.
+	Upstream upstream.Upstream
+
+	// ServiceName is the name of the service.
+	ServiceName string
+
+	// TXTSuffix is the TXT suffix for DNS request.
+	TXTSuffix string
+
+	// CacheTime is the time period to store hash.
+	CacheTime time.Duration
+
+	// CacheSize is the maximum size of the cache.  If it's zero, cache size is
+	// unlimited.
+	CacheSize uint
+}
+
+type Checker struct {
+	// upstream is the upstream DNS server.
+	upstream upstream.Upstream
+
+	// cache stores hostname hashes.
+	cache cache.Cache
+
+	// svc is the name of the service.
+	svc string
+
+	// txtSuffix is the TXT suffix for DNS request.
+	txtSuffix string
+
+	// cacheTime is the time period to store hash.
+	cacheTime time.Duration
+}
+
+// New returns Checker.
+func New(conf *Config) (c *Checker) {
+	return &Checker{
+		upstream: conf.Upstream,
+		cache: cache.New(cache.Config{
+			EnableLRU: true,
+			MaxSize:   conf.CacheSize,
+		}),
+		svc:       conf.ServiceName,
+		txtSuffix: conf.TXTSuffix,
+		cacheTime: conf.CacheTime,
+	}
+}
+
+// Check returns true if request for the host should be blocked.
+func (c *Checker) Check(host string) (ok bool, err error) {
+	hashes := hostnameToHashes(host)
+
+	found, blocked, hashesToRequest := c.findInCache(hashes)
+	if found {
+		log.Debug("%s: found %q in cache, blocked: %t", c.svc, host, blocked)
+
+		return blocked, nil
+	}
+
+	question := c.getQuestion(hashesToRequest)
+
+	log.Debug("%s: checking %s: %s", c.svc, host, question)
+	req := (&dns.Msg{}).SetQuestion(question, dns.TypeTXT)
+
+	resp, err := c.upstream.Exchange(req)
+	if err != nil {
+		return false, fmt.Errorf("getting hashes: %w", err)
+	}
+
+	matched, receivedHashes := c.processAnswer(hashesToRequest, resp, host)
+
+	c.storeInCache(hashesToRequest, receivedHashes)
+
+	return matched, nil
+}
+
+// hostnameToHashes returns hashes that should be checked by the hash prefix
+// filter.
+func hostnameToHashes(host string) (hashes []hostnameHash) {
+	// subDomainNum defines how many labels should be hashed to match against a
+	// hash prefix filter.
+	const subDomainNum = 4
+
+	pubSuf, icann := publicsuffix.PublicSuffix(host)
+	if !icann {
+		// Check the full private domain space.
+		pubSuf = ""
+	}
+
+	nDots := 0
+	i := strings.LastIndexFunc(host, func(r rune) (ok bool) {
+		if r == '.' {
+			nDots++
+		}
+
+		return nDots == subDomainNum
+	})
+	if i != -1 {
+		host = host[i+1:]
+	}
+
+	sub := netutil.Subdomains(host)
+
+	for _, s := range sub {
+		if s == pubSuf {
+			break
+		}
+
+		sum := sha256.Sum256([]byte(s))
+		hashes = append(hashes, sum)
+	}
+
+	return hashes
+}
+
+// getQuestion combines hexadecimal encoded prefixes of hashed hostnames into
+// string.
+func (c *Checker) getQuestion(hashes []hostnameHash) (q string) {
+	b := &strings.Builder{}
+
+	for _, hash := range hashes {
+		// nolint:looppointer // The subsilce is used for safe hex encoding.
+		stringutil.WriteToBuilder(b, hex.EncodeToString(hash[:prefixLen]), ".")
+	}
+
+	stringutil.WriteToBuilder(b, c.txtSuffix)
+
+	return b.String()
+}
+
+// processAnswer returns true if DNS response matches the hash, and received
+// hashed hostnames from the upstream.
+func (c *Checker) processAnswer(
+	hashesToRequest []hostnameHash,
+	resp *dns.Msg,
+	host string,
+) (matched bool, receivedHashes []hostnameHash) {
+	txtCount := 0
+
+	for _, a := range resp.Answer {
+		txt, ok := a.(*dns.TXT)
+		if !ok {
+			continue
+		}
+
+		txtCount++
+
+		receivedHashes = c.appendHashesFromTXT(receivedHashes, txt, host)
+	}
+
+	log.Debug("%s: received answer for %s with %d TXT count", c.svc, host, txtCount)
+
+	matched = findMatch(hashesToRequest, receivedHashes)
+	if matched {
+		log.Debug("%s: matched %s", c.svc, host)
+
+		return true, receivedHashes
+	}
+
+	return false, receivedHashes
+}
+
+// appendHashesFromTXT appends received hashed hostnames.
+func (c *Checker) appendHashesFromTXT(
+	hashes []hostnameHash,
+	txt *dns.TXT,
+	host string,
+) (receivedHashes []hostnameHash) {
+	log.Debug("%s: received hashes for %s: %v", c.svc, host, txt.Txt)
+
+	for _, t := range txt.Txt {
+		if len(t) != hexSize {
+			log.Debug("%s: wrong hex size %d for %s %s", c.svc, len(t), host, t)
+
+			continue
+		}
+
+		buf, err := hex.DecodeString(t)
+		if err != nil {
+			log.Debug("%s: decoding hex string %s: %s", c.svc, t, err)
+
+			continue
+		}
+
+		var hash hostnameHash
+		copy(hash[:], buf)
+		hashes = append(hashes, hash)
+	}
+
+	return hashes
+}
--- a/internal/filtering/hashprefix/hashprefix_internal_test.go
+++ b/internal/filtering/hashprefix/hashprefix_internal_test.go
@ -0,0 +1,248 @@
+package hashprefix
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
+	"github.com/AdguardTeam/golibs/cache"
+	"github.com/miekg/dns"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/exp/slices"
+)
+
+const (
+	cacheTime = 10 * time.Minute
+	cacheSize = 10000
+)
+
+func TestChcker_getQuestion(t *testing.T) {
+	const suf = "sb.dns.adguard.com."
+
+	// test hostnameToHashes()
+	hashes := hostnameToHashes("1.2.3.sub.host.com")
+	assert.Len(t, hashes, 3)
+
+	hash := sha256.Sum256([]byte("3.sub.host.com"))
+	hexPref1 := hex.EncodeToString(hash[:prefixLen])
+	assert.True(t, slices.Contains(hashes, hash))
+
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	hexPref2 := hex.EncodeToString(hash[:prefixLen])
+	assert.True(t, slices.Contains(hashes, hash))
+
+	hash = sha256.Sum256([]byte("host.com"))
+	hexPref3 := hex.EncodeToString(hash[:prefixLen])
+	assert.True(t, slices.Contains(hashes, hash))
+
+	hash = sha256.Sum256([]byte("com"))
+	assert.False(t, slices.Contains(hashes, hash))
+
+	c := &Checker{
+		svc:       "SafeBrowsing",
+		txtSuffix: suf,
+	}
+
+	q := c.getQuestion(hashes)
+
+	assert.Contains(t, q, hexPref1)
+	assert.Contains(t, q, hexPref2)
+	assert.Contains(t, q, hexPref3)
+	assert.True(t, strings.HasSuffix(q, suf))
+}
+
+func TestHostnameToHashes(t *testing.T) {
+	testCases := []struct {
+		name    string
+		host    string
+		wantLen int
+	}{{
+		name:    "basic",
+		host:    "example.com",
+		wantLen: 1,
+	}, {
+		name:    "sub_basic",
+		host:    "www.example.com",
+		wantLen: 2,
+	}, {
+		name:    "private_domain",
+		host:    "foo.co.uk",
+		wantLen: 1,
+	}, {
+		name:    "sub_private_domain",
+		host:    "bar.foo.co.uk",
+		wantLen: 2,
+	}, {
+		name:    "private_domain_v2",
+		host:    "foo.blogspot.co.uk",
+		wantLen: 4,
+	}, {
+		name:    "sub_private_domain_v2",
+		host:    "bar.foo.blogspot.co.uk",
+		wantLen: 4,
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			hashes := hostnameToHashes(tc.host)
+			assert.Len(t, hashes, tc.wantLen)
+		})
+	}
+}
+
+func TestChecker_storeInCache(t *testing.T) {
+	c := &Checker{
+		svc:       "SafeBrowsing",
+		cacheTime: cacheTime,
+	}
+	conf := cache.Config{}
+	c.cache = cache.New(conf)
+
+	// store in cache hashes for "3.sub.host.com" and "host.com"
+	//  and empty data for hash-prefix for "sub.host.com"
+	hashes := []hostnameHash{}
+	hash := sha256.Sum256([]byte("sub.host.com"))
+	hashes = append(hashes, hash)
+	var hashesArray []hostnameHash
+	hash4 := sha256.Sum256([]byte("3.sub.host.com"))
+	hashesArray = append(hashesArray, hash4)
+	hash2 := sha256.Sum256([]byte("host.com"))
+	hashesArray = append(hashesArray, hash2)
+	c.storeInCache(hashes, hashesArray)
+
+	// match "3.sub.host.com" or "host.com" from cache
+	hashes = []hostnameHash{}
+	hash = sha256.Sum256([]byte("3.sub.host.com"))
+	hashes = append(hashes, hash)
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	hashes = append(hashes, hash)
+	hash = sha256.Sum256([]byte("host.com"))
+	hashes = append(hashes, hash)
+	found, blocked, _ := c.findInCache(hashes)
+	assert.True(t, found)
+	assert.True(t, blocked)
+
+	// match "sub.host.com" from cache
+	hashes = []hostnameHash{}
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	hashes = append(hashes, hash)
+	found, blocked, _ = c.findInCache(hashes)
+	assert.True(t, found)
+	assert.False(t, blocked)
+
+	// Match "sub.host.com" from cache.  Another hash for "host.example" is not
+	// in the cache, so get data for it from the server.
+	hashes = []hostnameHash{}
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	hashes = append(hashes, hash)
+	hash = sha256.Sum256([]byte("host.example"))
+	hashes = append(hashes, hash)
+	found, _, hashesToRequest := c.findInCache(hashes)
+	assert.False(t, found)
+
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	ok := slices.Contains(hashesToRequest, hash)
+	assert.False(t, ok)
+
+	hash = sha256.Sum256([]byte("host.example"))
+	ok = slices.Contains(hashesToRequest, hash)
+	assert.True(t, ok)
+
+	c = &Checker{
+		svc:       "SafeBrowsing",
+		cacheTime: cacheTime,
+	}
+	c.cache = cache.New(cache.Config{})
+
+	hashes = []hostnameHash{}
+	hash = sha256.Sum256([]byte("sub.host.com"))
+	hashes = append(hashes, hash)
+
+	c.cache.Set(hash[:prefixLen], make([]byte, expirySize+hashSize))
+	found, _, _ = c.findInCache(hashes)
+	assert.False(t, found)
+}
+
+func TestChecker_Check(t *testing.T) {
+	const hostname = "example.org"
+
+	testCases := []struct {
+		name      string
+		wantBlock bool
+	}{{
+		name:      "sb_no_block",
+		wantBlock: false,
+	}, {
+		name:      "sb_block",
+		wantBlock: true,
+	}, {
+		name:      "pc_no_block",
+		wantBlock: false,
+	}, {
+		name:      "pc_block",
+		wantBlock: true,
+	}}
+
+	for _, tc := range testCases {
+		c := New(&Config{
+			CacheTime: cacheTime,
+			CacheSize: cacheSize,
+		})
+
+		// Prepare the upstream.
+		ups := aghtest.NewBlockUpstream(hostname, tc.wantBlock)
+
+		var numReq int
+		onExchange := ups.OnExchange
+		ups.OnExchange = func(req *dns.Msg) (resp *dns.Msg, err error) {
+			numReq++
+
+			return onExchange(req)
+		}
+
+		c.upstream = ups
+
+		t.Run(tc.name, func(t *testing.T) {
+			// Firstly, check the request blocking.
+			hits := 0
+			res := false
+			res, err := c.Check(hostname)
+			require.NoError(t, err)
+
+			if tc.wantBlock {
+				assert.True(t, res)
+				hits++
+			} else {
+				require.False(t, res)
+			}
+
+			// Check the cache state, check the response is now cached.
+			assert.Equal(t, 1, c.cache.Stats().Count)
+			assert.Equal(t, hits, c.cache.Stats().Hit)
+
+			// There was one request to an upstream.
+			assert.Equal(t, 1, numReq)
+
+			// Now make the same request to check the cache was used.
+			res, err = c.Check(hostname)
+			require.NoError(t, err)
+
+			if tc.wantBlock {
+				assert.True(t, res)
+			} else {
+				require.False(t, res)
+			}
+
+			// Check the cache state, it should've been used.
+			assert.Equal(t, 1, c.cache.Stats().Count)
+			assert.Equal(t, hits+1, c.cache.Stats().Hit)
+
+			// Check that there were no additional requests.
+			assert.Equal(t, 1, numReq)
+		})
+	}
+}
--- a/internal/filtering/http.go
+++ b/internal/filtering/http.go
@ -8,6 +8,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"sync"
 	"time"

 	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
@ -458,6 +459,80 @@ func (d *DNSFilter) handleCheckHost(w http.ResponseWriter, r *http.Request) {
 	_ = aghhttp.WriteJSONResponse(w, r, resp)
 }

+// setProtectedBool sets the value of a boolean pointer under a lock.  l must
+// protect the value under ptr.
+//
+// TODO(e.burkov):  Make it generic?
+func setProtectedBool(mu *sync.RWMutex, ptr *bool, val bool) {
+	mu.Lock()
+	defer mu.Unlock()
+
+	*ptr = val
+}
+
+// protectedBool gets the value of a boolean pointer under a read lock.  l must
+// protect the value under ptr.
+//
+// TODO(e.burkov):  Make it generic?
+func protectedBool(mu *sync.RWMutex, ptr *bool) (val bool) {
+	mu.RLock()
+	defer mu.RUnlock()
+
+	return *ptr
+}
+
+// handleSafeBrowsingEnable is the handler for the POST
+// /control/safebrowsing/enable HTTP API.
+func (d *DNSFilter) handleSafeBrowsingEnable(w http.ResponseWriter, r *http.Request) {
+	setProtectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled, true)
+	d.Config.ConfigModified()
+}
+
+// handleSafeBrowsingDisable is the handler for the POST
+// /control/safebrowsing/disable HTTP API.
+func (d *DNSFilter) handleSafeBrowsingDisable(w http.ResponseWriter, r *http.Request) {
+	setProtectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled, false)
+	d.Config.ConfigModified()
+}
+
+// handleSafeBrowsingStatus is the handler for the GET
+// /control/safebrowsing/status HTTP API.
+func (d *DNSFilter) handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
+	resp := &struct {
+		Enabled bool `json:"enabled"`
+	}{
+		Enabled: protectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled),
+	}
+
+	_ = aghhttp.WriteJSONResponse(w, r, resp)
+}
+
+// handleParentalEnable is the handler for the POST /control/parental/enable
+// HTTP API.
+func (d *DNSFilter) handleParentalEnable(w http.ResponseWriter, r *http.Request) {
+	setProtectedBool(&d.confLock, &d.Config.ParentalEnabled, true)
+	d.Config.ConfigModified()
+}
+
+// handleParentalDisable is the handler for the POST /control/parental/disable
+// HTTP API.
+func (d *DNSFilter) handleParentalDisable(w http.ResponseWriter, r *http.Request) {
+	setProtectedBool(&d.confLock, &d.Config.ParentalEnabled, false)
+	d.Config.ConfigModified()
+}
+
+// handleParentalStatus is the handler for the GET /control/parental/status
+// HTTP API.
+func (d *DNSFilter) handleParentalStatus(w http.ResponseWriter, r *http.Request) {
+	resp := &struct {
+		Enabled bool `json:"enabled"`
+	}{
+		Enabled: protectedBool(&d.confLock, &d.Config.ParentalEnabled),
+	}
+
+	_ = aghhttp.WriteJSONResponse(w, r, resp)
+}
+
 // RegisterFilteringHandlers - register handlers
 func (d *DNSFilter) RegisterFilteringHandlers() {
 	registerHTTP := d.HTTPRegister
--- a/internal/filtering/http_test.go
+++ b/internal/filtering/http_test.go
@ -8,6 +8,7 @@ import (
 	"testing"
 	"time"

+	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@ -136,3 +137,171 @@ func TestDNSFilter_handleFilteringSetURL(t *testing.T) {
 		})
 	}
 }
+
+func TestDNSFilter_handleSafeBrowsingStatus(t *testing.T) {
+	const (
+		testTimeout = time.Second
+		statusURL   = "/control/safebrowsing/status"
+	)
+
+	confModCh := make(chan struct{})
+	filtersDir := t.TempDir()
+
+	testCases := []struct {
+		name       string
+		url        string
+		enabled    bool
+		wantStatus assert.BoolAssertionFunc
+	}{{
+		name:       "enable_off",
+		url:        "/control/safebrowsing/enable",
+		enabled:    false,
+		wantStatus: assert.True,
+	}, {
+		name:       "enable_on",
+		url:        "/control/safebrowsing/enable",
+		enabled:    true,
+		wantStatus: assert.True,
+	}, {
+		name:       "disable_on",
+		url:        "/control/safebrowsing/disable",
+		enabled:    true,
+		wantStatus: assert.False,
+	}, {
+		name:       "disable_off",
+		url:        "/control/safebrowsing/disable",
+		enabled:    false,
+		wantStatus: assert.False,
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			handlers := make(map[string]http.Handler)
+
+			d, err := New(&Config{
+				ConfigModified: func() {
+					testutil.RequireSend(testutil.PanicT{}, confModCh, struct{}{}, testTimeout)
+				},
+				DataDir: filtersDir,
+				HTTPRegister: func(_, url string, handler http.HandlerFunc) {
+					handlers[url] = handler
+				},
+				SafeBrowsingEnabled: tc.enabled,
+			}, nil)
+			require.NoError(t, err)
+			t.Cleanup(d.Close)
+
+			d.RegisterFilteringHandlers()
+			require.NotEmpty(t, handlers)
+			require.Contains(t, handlers, statusURL)
+
+			r := httptest.NewRequest(http.MethodPost, tc.url, nil)
+			w := httptest.NewRecorder()
+
+			go handlers[tc.url].ServeHTTP(w, r)
+
+			testutil.RequireReceive(t, confModCh, testTimeout)
+
+			r = httptest.NewRequest(http.MethodGet, statusURL, nil)
+			w = httptest.NewRecorder()
+
+			handlers[statusURL].ServeHTTP(w, r)
+			require.Equal(t, http.StatusOK, w.Code)
+
+			status := struct {
+				Enabled bool `json:"enabled"`
+			}{
+				Enabled: false,
+			}
+
+			err = json.NewDecoder(w.Body).Decode(&status)
+			require.NoError(t, err)
+
+			tc.wantStatus(t, status.Enabled)
+		})
+	}
+}
+
+func TestDNSFilter_handleParentalStatus(t *testing.T) {
+	const (
+		testTimeout = time.Second
+		statusURL   = "/control/parental/status"
+	)
+
+	confModCh := make(chan struct{})
+	filtersDir := t.TempDir()
+
+	testCases := []struct {
+		name       string
+		url        string
+		enabled    bool
+		wantStatus assert.BoolAssertionFunc
+	}{{
+		name:       "enable_off",
+		url:        "/control/parental/enable",
+		enabled:    false,
+		wantStatus: assert.True,
+	}, {
+		name:       "enable_on",
+		url:        "/control/parental/enable",
+		enabled:    true,
+		wantStatus: assert.True,
+	}, {
+		name:       "disable_on",
+		url:        "/control/parental/disable",
+		enabled:    true,
+		wantStatus: assert.False,
+	}, {
+		name:       "disable_off",
+		url:        "/control/parental/disable",
+		enabled:    false,
+		wantStatus: assert.False,
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			handlers := make(map[string]http.Handler)
+
+			d, err := New(&Config{
+				ConfigModified: func() {
+					testutil.RequireSend(testutil.PanicT{}, confModCh, struct{}{}, testTimeout)
+				},
+				DataDir: filtersDir,
+				HTTPRegister: func(_, url string, handler http.HandlerFunc) {
+					handlers[url] = handler
+				},
+				ParentalEnabled: tc.enabled,
+			}, nil)
+			require.NoError(t, err)
+			t.Cleanup(d.Close)
+
+			d.RegisterFilteringHandlers()
+			require.NotEmpty(t, handlers)
+			require.Contains(t, handlers, statusURL)
+
+			r := httptest.NewRequest(http.MethodPost, tc.url, nil)
+			w := httptest.NewRecorder()
+
+			go handlers[tc.url].ServeHTTP(w, r)
+
+			testutil.RequireReceive(t, confModCh, testTimeout)
+
+			r = httptest.NewRequest(http.MethodGet, statusURL, nil)
+			w = httptest.NewRecorder()
+
+			handlers[statusURL].ServeHTTP(w, r)
+			require.Equal(t, http.StatusOK, w.Code)
+
+			status := struct {
+				Enabled bool `json:"enabled"`
+			}{
+				Enabled: false,
+			}
+
+			err = json.NewDecoder(w.Body).Decode(&status)
+			require.NoError(t, err)
+
+			tc.wantStatus(t, status.Enabled)
+		})
+	}
+}
--- a/internal/filtering/safebrowsing.go
+++ b/internal/filtering/safebrowsing.go
@ -1,433 +0,0 @@
-package filtering
-
-import (
-	"bytes"
-	"crypto/sha256"
-	"encoding/binary"
-	"encoding/hex"
-	"fmt"
-	"net"
-	"net/http"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
-	"github.com/AdguardTeam/dnsproxy/upstream"
-	"github.com/AdguardTeam/golibs/cache"
-	"github.com/AdguardTeam/golibs/log"
-	"github.com/AdguardTeam/golibs/stringutil"
-	"github.com/miekg/dns"
-	"golang.org/x/exp/slices"
-	"golang.org/x/net/publicsuffix"
-)
-
-// Safe browsing and parental control methods.
-
-// TODO(a.garipov): Make configurable.
-const (
-	dnsTimeout                = 3 * time.Second
-	defaultSafebrowsingServer = `https://family.adguard-dns.com/dns-query`
-	defaultParentalServer     = `https://family.adguard-dns.com/dns-query`
-	sbTXTSuffix               = `sb.dns.adguard.com.`
-	pcTXTSuffix               = `pc.dns.adguard.com.`
-)
-
-// SetParentalUpstream sets the parental upstream for *DNSFilter.
-//
-// TODO(e.burkov): Remove this in v1 API to forbid the direct access.
-func (d *DNSFilter) SetParentalUpstream(u upstream.Upstream) {
-	d.parentalUpstream = u
-}
-
-// SetSafeBrowsingUpstream sets the safe browsing upstream for *DNSFilter.
-//
-// TODO(e.burkov): Remove this in v1 API to forbid the direct access.
-func (d *DNSFilter) SetSafeBrowsingUpstream(u upstream.Upstream) {
-	d.safeBrowsingUpstream = u
-}
-
-func (d *DNSFilter) initSecurityServices() error {
-	var err error
-	d.safeBrowsingServer = defaultSafebrowsingServer
-	d.parentalServer = defaultParentalServer
-	opts := &upstream.Options{
-		Timeout: dnsTimeout,
-		ServerIPAddrs: []net.IP{
-			{94, 140, 14, 15},
-			{94, 140, 15, 16},
-			net.ParseIP("2a10:50c0::bad1:ff"),
-			net.ParseIP("2a10:50c0::bad2:ff"),
-		},
-	}
-
-	parUps, err := upstream.AddressToUpstream(d.parentalServer, opts)
-	if err != nil {
-		return fmt.Errorf("converting parental server: %w", err)
-	}
-	d.SetParentalUpstream(parUps)
-
-	sbUps, err := upstream.AddressToUpstream(d.safeBrowsingServer, opts)
-	if err != nil {
-		return fmt.Errorf("converting safe browsing server: %w", err)
-	}
-	d.SetSafeBrowsingUpstream(sbUps)
-
-	return nil
-}
-
-/*
-expire byte[4]
-hash byte[32]
-...
-*/
-func (c *sbCtx) setCache(prefix, hashes []byte) {
-	d := make([]byte, 4+len(hashes))
-	expire := uint(time.Now().Unix()) + c.cacheTime*60
-	binary.BigEndian.PutUint32(d[:4], uint32(expire))
-	copy(d[4:], hashes)
-	c.cache.Set(prefix, d)
-	log.Debug("%s: stored in cache: %v", c.svc, prefix)
-}
-
-// findInHash returns 32-byte hash if it's found in hashToHost.
-func (c *sbCtx) findInHash(val []byte) (hash32 [32]byte, found bool) {
-	for i := 4; i < len(val); i += 32 {
-		hash := val[i : i+32]
-
-		copy(hash32[:], hash[0:32])
-
-		_, found = c.hashToHost[hash32]
-		if found {
-			return hash32, found
-		}
-	}
-
-	return [32]byte{}, false
-}
-
-func (c *sbCtx) getCached() int {
-	now := time.Now().Unix()
-	hashesToRequest := map[[32]byte]string{}
-	for k, v := range c.hashToHost {
-		// nolint:looppointer // The subsilce is used for a safe cache lookup.
-		val := c.cache.Get(k[0:2])
-		if val == nil || now >= int64(binary.BigEndian.Uint32(val)) {
-			hashesToRequest[k] = v
-			continue
-		}
-		if hash32, found := c.findInHash(val); found {
-			log.Debug("%s: found in cache: %s: blocked by %v", c.svc, c.host, hash32)
-			return 1
-		}
-	}
-
-	if len(hashesToRequest) == 0 {
-		log.Debug("%s: found in cache: %s: not blocked", c.svc, c.host)
-		return -1
-	}
-
-	c.hashToHost = hashesToRequest
-	return 0
-}
-
-type sbCtx struct {
-	host       string
-	svc        string
-	hashToHost map[[32]byte]string
-	cache      cache.Cache
-	cacheTime  uint
-}
-
-func hostnameToHashes(host string) map[[32]byte]string {
-	hashes := map[[32]byte]string{}
-	tld, icann := publicsuffix.PublicSuffix(host)
-	if !icann {
-		// private suffixes like cloudfront.net
-		tld = ""
-	}
-	curhost := host
-
-	nDots := 0
-	for i := len(curhost) - 1; i >= 0; i-- {
-		if curhost[i] == '.' {
-			nDots++
-			if nDots == 4 {
-				curhost = curhost[i+1:] // "xxx.a.b.c.d" -> "a.b.c.d"
-				break
-			}
-		}
-	}
-
-	for {
-		if curhost == "" {
-			// we've reached end of string
-			break
-		}
-		if tld != "" && curhost == tld {
-			// we've reached the TLD, don't hash it
-			break
-		}
-
-		sum := sha256.Sum256([]byte(curhost))
-		hashes[sum] = curhost
-
-		pos := strings.IndexByte(curhost, byte('.'))
-		if pos < 0 {
-			break
-		}
-		curhost = curhost[pos+1:]
-	}
-	return hashes
-}
-
-// convert hash array to string
-func (c *sbCtx) getQuestion() string {
-	b := &strings.Builder{}
-
-	for hash := range c.hashToHost {
-		// nolint:looppointer // The subsilce is used for safe hex encoding.
-		stringutil.WriteToBuilder(b, hex.EncodeToString(hash[0:2]), ".")
-	}
-
-	if c.svc == "SafeBrowsing" {
-		stringutil.WriteToBuilder(b, sbTXTSuffix)
-
-		return b.String()
-	}
-
-	stringutil.WriteToBuilder(b, pcTXTSuffix)
-
-	return b.String()
-}
-
-// Find the target hash in TXT response
-func (c *sbCtx) processTXT(resp *dns.Msg) (bool, [][]byte) {
-	matched := false
-	hashes := [][]byte{}
-	for _, a := range resp.Answer {
-		txt, ok := a.(*dns.TXT)
-		if !ok {
-			continue
-		}
-		log.Debug("%s: received hashes for %s: %v", c.svc, c.host, txt.Txt)
-
-		for _, t := range txt.Txt {
-			if len(t) != 32*2 {
-				continue
-			}
-			hash, err := hex.DecodeString(t)
-			if err != nil {
-				continue
-			}
-
-			hashes = append(hashes, hash)
-
-			if !matched {
-				var hash32 [32]byte
-				copy(hash32[:], hash)
-
-				var hashHost string
-				hashHost, ok = c.hashToHost[hash32]
-				if ok {
-					log.Debug("%s: matched %s by %s/%s", c.svc, c.host, hashHost, t)
-					matched = true
-				}
-			}
-		}
-	}
-
-	return matched, hashes
-}
-
-func (c *sbCtx) storeCache(hashes [][]byte) {
-	slices.SortFunc(hashes, func(a, b []byte) (sortsBefore bool) {
-		return bytes.Compare(a, b) == -1
-	})
-
-	var curData []byte
-	var prevPrefix []byte
-	for i, hash := range hashes {
-		// nolint:looppointer // The subsilce is used for a safe comparison.
-		if !bytes.Equal(hash[0:2], prevPrefix) {
-			if i != 0 {
-				c.setCache(prevPrefix, curData)
-				curData = nil
-			}
-			prevPrefix = hashes[i][0:2]
-		}
-		curData = append(curData, hash...)
-	}
-
-	if len(prevPrefix) != 0 {
-		c.setCache(prevPrefix, curData)
-	}
-
-	for hash := range c.hashToHost {
-		// nolint:looppointer // The subsilce is used for a safe cache lookup.
-		prefix := hash[0:2]
-		val := c.cache.Get(prefix)
-		if val == nil {
-			c.setCache(prefix, nil)
-		}
-	}
-}
-
-func check(c *sbCtx, r Result, u upstream.Upstream) (Result, error) {
-	c.hashToHost = hostnameToHashes(c.host)
-	switch c.getCached() {
-	case -1:
-		return Result{}, nil
-	case 1:
-		return r, nil
-	}
-
-	question := c.getQuestion()
-
-	log.Tracef("%s: checking %s: %s", c.svc, c.host, question)
-	req := (&dns.Msg{}).SetQuestion(question, dns.TypeTXT)
-
-	resp, err := u.Exchange(req)
-	if err != nil {
-		return Result{}, err
-	}
-
-	matched, receivedHashes := c.processTXT(resp)
-
-	c.storeCache(receivedHashes)
-	if matched {
-		return r, nil
-	}
-
-	return Result{}, nil
-}
-
-// TODO(a.garipov): Unify with checkParental.
-func (d *DNSFilter) checkSafeBrowsing(
-	host string,
-	_ uint16,
-	setts *Settings,
-) (res Result, err error) {
-	if !setts.ProtectionEnabled || !setts.SafeBrowsingEnabled {
-		return Result{}, nil
-	}
-
-	if log.GetLevel() >= log.DEBUG {
-		timer := log.StartTimer()
-		defer timer.LogElapsed("safebrowsing lookup for %q", host)
-	}
-
-	sctx := &sbCtx{
-		host:      host,
-		svc:       "SafeBrowsing",
-		cache:     d.safebrowsingCache,
-		cacheTime: d.Config.CacheTime,
-	}
-
-	res = Result{
-		Rules: []*ResultRule{{
-			Text:         "adguard-malware-shavar",
-			FilterListID: SafeBrowsingListID,
-		}},
-		Reason:     FilteredSafeBrowsing,
-		IsFiltered: true,
-	}
-
-	return check(sctx, res, d.safeBrowsingUpstream)
-}
-
-// TODO(a.garipov): Unify with checkSafeBrowsing.
-func (d *DNSFilter) checkParental(
-	host string,
-	_ uint16,
-	setts *Settings,
-) (res Result, err error) {
-	if !setts.ProtectionEnabled || !setts.ParentalEnabled {
-		return Result{}, nil
-	}
-
-	if log.GetLevel() >= log.DEBUG {
-		timer := log.StartTimer()
-		defer timer.LogElapsed("parental lookup for %q", host)
-	}
-
-	sctx := &sbCtx{
-		host:      host,
-		svc:       "Parental",
-		cache:     d.parentalCache,
-		cacheTime: d.Config.CacheTime,
-	}
-
-	res = Result{
-		Rules: []*ResultRule{{
-			Text:         "parental CATEGORY_BLACKLISTED",
-			FilterListID: ParentalListID,
-		}},
-		Reason:     FilteredParental,
-		IsFiltered: true,
-	}
-
-	return check(sctx, res, d.parentalUpstream)
-}
-
-// setProtectedBool sets the value of a boolean pointer under a lock.  l must
-// protect the value under ptr.
-//
-// TODO(e.burkov):  Make it generic?
-func setProtectedBool(mu *sync.RWMutex, ptr *bool, val bool) {
-	mu.Lock()
-	defer mu.Unlock()
-
-	*ptr = val
-}
-
-// protectedBool gets the value of a boolean pointer under a read lock.  l must
-// protect the value under ptr.
-//
-// TODO(e.burkov):  Make it generic?
-func protectedBool(mu *sync.RWMutex, ptr *bool) (val bool) {
-	mu.RLock()
-	defer mu.RUnlock()
-
-	return *ptr
-}
-
-func (d *DNSFilter) handleSafeBrowsingEnable(w http.ResponseWriter, r *http.Request) {
-	setProtectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled, true)
-	d.Config.ConfigModified()
-}
-
-func (d *DNSFilter) handleSafeBrowsingDisable(w http.ResponseWriter, r *http.Request) {
-	setProtectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled, false)
-	d.Config.ConfigModified()
-}
-
-func (d *DNSFilter) handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
-	resp := &struct {
-		Enabled bool `json:"enabled"`
-	}{
-		Enabled: protectedBool(&d.confLock, &d.Config.SafeBrowsingEnabled),
-	}
-
-	_ = aghhttp.WriteJSONResponse(w, r, resp)
-}
-
-func (d *DNSFilter) handleParentalEnable(w http.ResponseWriter, r *http.Request) {
-	setProtectedBool(&d.confLock, &d.Config.ParentalEnabled, true)
-	d.Config.ConfigModified()
-}
-
-func (d *DNSFilter) handleParentalDisable(w http.ResponseWriter, r *http.Request) {
-	setProtectedBool(&d.confLock, &d.Config.ParentalEnabled, false)
-	d.Config.ConfigModified()
-}
-
-func (d *DNSFilter) handleParentalStatus(w http.ResponseWriter, r *http.Request) {
-	resp := &struct {
-		Enabled bool `json:"enabled"`
-	}{
-		Enabled: protectedBool(&d.confLock, &d.Config.ParentalEnabled),
-	}
-
-	_ = aghhttp.WriteJSONResponse(w, r, resp)
-}
--- a/internal/filtering/safebrowsing_test.go
+++ b/internal/filtering/safebrowsing_test.go
@ -1,226 +0,0 @@
-package filtering
-
-import (
-	"crypto/sha256"
-	"strings"
-	"testing"
-
-	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
-	"github.com/AdguardTeam/golibs/cache"
-	"github.com/miekg/dns"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestSafeBrowsingHash(t *testing.T) {
-	// test hostnameToHashes()
-	hashes := hostnameToHashes("1.2.3.sub.host.com")
-	assert.Len(t, hashes, 3)
-	_, ok := hashes[sha256.Sum256([]byte("3.sub.host.com"))]
-	assert.True(t, ok)
-	_, ok = hashes[sha256.Sum256([]byte("sub.host.com"))]
-	assert.True(t, ok)
-	_, ok = hashes[sha256.Sum256([]byte("host.com"))]
-	assert.True(t, ok)
-	_, ok = hashes[sha256.Sum256([]byte("com"))]
-	assert.False(t, ok)
-
-	c := &sbCtx{
-		svc:        "SafeBrowsing",
-		hashToHost: hashes,
-	}
-
-	q := c.getQuestion()
-
-	assert.Contains(t, q, "7a1b.")
-	assert.Contains(t, q, "af5a.")
-	assert.Contains(t, q, "eb11.")
-	assert.True(t, strings.HasSuffix(q, "sb.dns.adguard.com."))
-}
-
-func TestSafeBrowsingCache(t *testing.T) {
-	c := &sbCtx{
-		svc:       "SafeBrowsing",
-		cacheTime: 100,
-	}
-	conf := cache.Config{}
-	c.cache = cache.New(conf)
-
-	// store in cache hashes for "3.sub.host.com" and "host.com"
-	//  and empty data for hash-prefix for "sub.host.com"
-	hash := sha256.Sum256([]byte("sub.host.com"))
-	c.hashToHost = make(map[[32]byte]string)
-	c.hashToHost[hash] = "sub.host.com"
-	var hashesArray [][]byte
-	hash4 := sha256.Sum256([]byte("3.sub.host.com"))
-	hashesArray = append(hashesArray, hash4[:])
-	hash2 := sha256.Sum256([]byte("host.com"))
-	hashesArray = append(hashesArray, hash2[:])
-	c.storeCache(hashesArray)
-
-	// match "3.sub.host.com" or "host.com" from cache
-	c.hashToHost = make(map[[32]byte]string)
-	hash = sha256.Sum256([]byte("3.sub.host.com"))
-	c.hashToHost[hash] = "3.sub.host.com"
-	hash = sha256.Sum256([]byte("sub.host.com"))
-	c.hashToHost[hash] = "sub.host.com"
-	hash = sha256.Sum256([]byte("host.com"))
-	c.hashToHost[hash] = "host.com"
-	assert.Equal(t, 1, c.getCached())
-
-	// match "sub.host.com" from cache
-	c.hashToHost = make(map[[32]byte]string)
-	hash = sha256.Sum256([]byte("sub.host.com"))
-	c.hashToHost[hash] = "sub.host.com"
-	assert.Equal(t, -1, c.getCached())
-
-	// Match "sub.host.com" from cache.  Another hash for "host.example" is not
-	// in the cache, so get data for it from the server.
-	c.hashToHost = make(map[[32]byte]string)
-	hash = sha256.Sum256([]byte("sub.host.com"))
-	c.hashToHost[hash] = "sub.host.com"
-	hash = sha256.Sum256([]byte("host.example"))
-	c.hashToHost[hash] = "host.example"
-	assert.Empty(t, c.getCached())
-
-	hash = sha256.Sum256([]byte("sub.host.com"))
-	_, ok := c.hashToHost[hash]
-	assert.False(t, ok)
-
-	hash = sha256.Sum256([]byte("host.example"))
-	_, ok = c.hashToHost[hash]
-	assert.True(t, ok)
-
-	c = &sbCtx{
-		svc:       "SafeBrowsing",
-		cacheTime: 100,
-	}
-	conf = cache.Config{}
-	c.cache = cache.New(conf)
-
-	hash = sha256.Sum256([]byte("sub.host.com"))
-	c.hashToHost = make(map[[32]byte]string)
-	c.hashToHost[hash] = "sub.host.com"
-
-	c.cache.Set(hash[0:2], make([]byte, 32))
-	assert.Empty(t, c.getCached())
-}
-
-func TestSBPC_checkErrorUpstream(t *testing.T) {
-	d, _ := newForTest(t, &Config{SafeBrowsingEnabled: true}, nil)
-	t.Cleanup(d.Close)
-
-	ups := aghtest.NewErrorUpstream()
-	d.SetSafeBrowsingUpstream(ups)
-	d.SetParentalUpstream(ups)
-
-	setts := &Settings{
-		ProtectionEnabled:   true,
-		SafeBrowsingEnabled: true,
-		ParentalEnabled:     true,
-	}
-
-	_, err := d.checkSafeBrowsing("smthng.com", dns.TypeA, setts)
-	assert.Error(t, err)
-
-	_, err = d.checkParental("smthng.com", dns.TypeA, setts)
-	assert.Error(t, err)
-}
-
-func TestSBPC(t *testing.T) {
-	d, _ := newForTest(t, &Config{SafeBrowsingEnabled: true}, nil)
-	t.Cleanup(d.Close)
-
-	const hostname = "example.org"
-
-	setts := &Settings{
-		ProtectionEnabled:   true,
-		SafeBrowsingEnabled: true,
-		ParentalEnabled:     true,
-	}
-
-	testCases := []struct {
-		testCache cache.Cache
-		testFunc  func(host string, _ uint16, _ *Settings) (res Result, err error)
-		name      string
-		block     bool
-	}{{
-		testCache: d.safebrowsingCache,
-		testFunc:  d.checkSafeBrowsing,
-		name:      "sb_no_block",
-		block:     false,
-	}, {
-		testCache: d.safebrowsingCache,
-		testFunc:  d.checkSafeBrowsing,
-		name:      "sb_block",
-		block:     true,
-	}, {
-		testCache: d.parentalCache,
-		testFunc:  d.checkParental,
-		name:      "pc_no_block",
-		block:     false,
-	}, {
-		testCache: d.parentalCache,
-		testFunc:  d.checkParental,
-		name:      "pc_block",
-		block:     true,
-	}}
-
-	for _, tc := range testCases {
-		// Prepare the upstream.
-		ups := aghtest.NewBlockUpstream(hostname, tc.block)
-
-		var numReq int
-		onExchange := ups.OnExchange
-		ups.OnExchange = func(req *dns.Msg) (resp *dns.Msg, err error) {
-			numReq++
-
-			return onExchange(req)
-		}
-
-		d.SetSafeBrowsingUpstream(ups)
-		d.SetParentalUpstream(ups)
-
-		t.Run(tc.name, func(t *testing.T) {
-			// Firstly, check the request blocking.
-			hits := 0
-			res, err := tc.testFunc(hostname, dns.TypeA, setts)
-			require.NoError(t, err)
-
-			if tc.block {
-				assert.True(t, res.IsFiltered)
-				require.Len(t, res.Rules, 1)
-				hits++
-			} else {
-				require.False(t, res.IsFiltered)
-			}
-
-			// Check the cache state, check the response is now cached.
-			assert.Equal(t, 1, tc.testCache.Stats().Count)
-			assert.Equal(t, hits, tc.testCache.Stats().Hit)
-
-			// There was one request to an upstream.
-			assert.Equal(t, 1, numReq)
-
-			// Now make the same request to check the cache was used.
-			res, err = tc.testFunc(hostname, dns.TypeA, setts)
-			require.NoError(t, err)
-
-			if tc.block {
-				assert.True(t, res.IsFiltered)
-				require.Len(t, res.Rules, 1)
-			} else {
-				require.False(t, res.IsFiltered)
-			}
-
-			// Check the cache state, it should've been used.
-			assert.Equal(t, 1, tc.testCache.Stats().Count)
-			assert.Equal(t, hits+1, tc.testCache.Stats().Hit)
-
-			// Check that there were no additional requests.
-			assert.Equal(t, 1, numReq)
-		})
-
-		purgeCaches(d)
-	}
-}
--- a/internal/filtering/servicelist.go
+++ b/internal/filtering/servicelist.go
@ -12,6 +12,14 @@ type blockedService struct {

 // blockedServices contains raw blocked service data.
 var blockedServices = []blockedService{{
+	ID:      "500px",
+	Name:    "500px",
+	IconSVG: []byte("<svg xmlns=\"http://www.w3.org/2000/svg\" fill=\"currentColor\" viewBox=\"0 0 50 50\"><path d=\"M 5 14 L 2.5 26 L 6.800781 26 C 6.800781 26 7.699219 24.300781 10.199219 24.300781 C 12.699219 24.300781 14 26.199219 14 28.300781 C 14 30.402344 12.5 32.800781 10.199219 32.800781 C 7.898438 32.800781 6.5 30.398438 6.5 29 L 2 29 C 2 30.199219 3 36 10.199219 36 C 15.15625 36 17.417969 33.121094 18.015625 31.898438 C 19.386719 34.34375 21.992188 36 24.984375 36 C 27.253906 36 29.777344 34.808594 32.5 32.453125 C 35.222656 34.808594 37.746094 36 40.015625 36 C 44.417969 36 48 32.410156 48 28 C 48 23.589844 44.417969 20 40.015625 20 C 37.746094 20 35.222656 21.191406 32.5 23.546875 C 29.777344 21.191406 27.253906 20 24.984375 20 C 21.832031 20 19.105469 21.847656 17.8125 24.511719 C 17.113281 23.382813 15.414063 21 11.902344 21 C 8.101563 21 7.300781 22.597656 7.300781 22.597656 C 7.300781 22.597656 7.699219 21.300781 8.300781 18 L 17 18 L 17 14 Z M 24.984375 25 C 25.453125 25 26.800781 25.226563 29.230469 27.328125 L 30.011719 28 L 29.230469 28.671875 C 26.800781 30.773438 25.453125 31 24.984375 31 C 23.339844 31 22 29.652344 22 28 C 22 26.347656 23.339844 25 24.984375 25 Z M 40.015625 25 C 41.660156 25 43 26.347656 43 28 C 43 29.652344 41.660156 31 40.015625 31 C 39.546875 31 38.199219 30.773438 35.769531 28.671875 L 34.988281 28 L 35.769531 27.328125 C 38.199219 25.226563 39.546875 25 40.015625 25 Z\"/></svg>"),
+	Rules: []string{
+		"||500px.com^",
+		"||500px.org^",
+	},
+}, {
 	ID:      "9gag",
 	Name:    "9GAG",
 	IconSVG: []byte("<svg xmlns=\"http://www.w3.org/2000/svg\" fill=\"currentColor\" viewBox=\"0 0 50 50\"><path d=\"M 44 14 C 44 13.644531 43.8125 13.316406 43.507813 13.136719 C 40.453125 11.347656 28.46875 4.847656 25.535156 3.136719 C 25.222656 2.957031 24.839844 2.957031 24.527344 3.136719 C 21.128906 5.117188 10.089844 11.621094 7.496094 13.136719 C 7.1875 13.316406 7 13.644531 7 14 L 7 20 C 7 20.378906 7.214844 20.722656 7.550781 20.894531 C 7.660156 20.949219 18.597656 26.453125 24.5 29.867188 C 24.8125 30.046875 25.195313 30.046875 25.507813 29.863281 C 27.269531 28.828125 29.117188 27.859375 30.902344 26.921875 C 32.253906 26.214844 33.636719 25.488281 35.003906 24.722656 C 35.007813 26.820313 35.003906 29.296875 35 30.40625 L 25 35.859375 L 14.480469 30.121094 C 14.144531 29.9375 13.730469 29.964844 13.417969 30.1875 L 6.417969 35.1875 C 6.140625 35.386719 5.980469 35.714844 6.003906 36.054688 C 6.023438 36.398438 6.214844 36.707031 6.515625 36.871094 L 24.542969 46.871094 C 24.695313 46.957031 24.859375 47 25.027344 47 C 25.195313 47 25.363281 46.957031 25.515625 46.875 L 43.484375 36.875 C 43.804688 36.695313 44 36.363281 44 36 C 44 36 43.992188 21.011719 44 14 Z M 25 20 L 18 16 L 25 12 L 32 16 Z\" /></svg>"),
@ -1180,6 +1188,18 @@ var blockedServices = []blockedService{{
 		"||zuckerberg.com^",
 		"||zuckerberg.net^",
 	},
+}, {
+	ID:      "flickr",
+	Name:    "Flickr",
+	IconSVG: []byte("<svg xmlns=\"http://www.w3.org/2000/svg\" fill=\"currentColor\" viewBox=\"0 0 50 50\"><path d=\"M 9 4 C 6.2504839 4 4 6.2504839 4 9 L 4 41 C 4 43.749516 6.2504839 46 9 46 L 41 46 C 43.749516 46 46 43.749516 46 41 L 46 9 C 46 6.2504839 43.749516 4 41 4 L 9 4 z M 9 6 L 41 6 C 42.668484 6 44 7.3315161 44 9 L 44 41 C 44 42.668484 42.668484 44 41 44 L 9 44 C 7.3315161 44 6 42.668484 6 41 L 6 9 C 6 7.3315161 7.3315161 6 9 6 z M 16 17 C 11.59 17 8 20.59 8 25 C 8 29.41 11.59 33 16 33 C 20.41 33 24 29.41 24 25 C 24 20.59 20.41 17 16 17 z M 34 17 C 29.59 17 26 20.59 26 25 C 26 29.41 29.59 33 34 33 C 38.41 33 42 29.41 42 25 C 42 20.59 38.41 17 34 17 z\"/></svg>"),
+	Rules: []string{
+		"||flic.kr^",
+		"||flickr.com^",
+		"||flickr.net^",
+		"||flickrprints.com^",
+		"||flickrpro.com^",
+		"||staticflickr.com^",
+	},
 }, {
 	ID:      "gog",
 	Name:    "GOG",
@ -1325,6 +1345,13 @@ var blockedServices = []blockedService{{
 		"||kakao.com^",
 		"||kgslb.com^",
 	},
+}, {
+	ID:      "kik",
+	Name:    "Kik",
+	IconSVG: []byte("<svg xmlns=\"http://www.w3.org/2000/svg\" fill=\"currentColor\" viewBox=\"0 0 50 50\"><path d=\"M 3.5039062 12 C 1.9347705 11.994817 0.87857579 12.97636 0.4453125 13.849609 C 0.01204921 14.722858 0 15.564453 0 15.564453 A 1.0001 1.0001 0 0 0 0 15.59375 L 0 35 A 1.0001 1.0001 0 0 0 0.00390625 35.078125 C 0.00390625 35.078125 0.05696144 35.828363 0.5390625 36.554688 C 1.0211636 37.281011 2.0459252 38.004441 3.5019531 38.001953 C 4.8916439 38.000053 5.8837351 37.273604 6.3769531 36.578125 C 6.8701712 35.882646 6.9863281 35.166016 6.9863281 35.166016 A 1.0001 1.0001 0 0 0 7 35 L 7 31.802734 L 10.167969 36.554688 L 10.130859 36.494141 C 10.511831 37.164615 11.143097 37.525465 11.742188 37.730469 C 12.341278 37.935473 12.950104 38.001953 13.5 38.001953 C 15.411725 38.001953 17 36.431487 17 34.5 C 17 34.056649 16.90825 34.03442 16.851562 33.912109 C 16.794882 33.789799 16.730864 33.671331 16.654297 33.537109 C 16.501163 33.268666 16.298339 32.944015 16.058594 32.572266 C 15.579103 31.828767 14.950355 30.90254 14.322266 29.992188 C 13.310206 28.525308 12.655222 27.610988 12.300781 27.113281 L 14.707031 24.707031 A 1.0001 1.0001 0 0 0 14.738281 24.673828 C 14.738281 24.673828 15.354706 24.012223 15.748047 23.042969 C 16.141388 22.073714 16.298687 20.56089 15.259766 19.349609 C 14.281705 18.208994 12.842689 18.141009 11.925781 18.416016 C 11.008874 18.691022 10.371094 19.222656 10.371094 19.222656 A 1.0001 1.0001 0 0 0 10.292969 19.292969 L 6.9980469 22.587891 L 6.9921875 15.646484 A 1.0001 1.0001 0 0 0 6.9902344 15.580078 C 6.9902344 15.580078 6.9441634 14.743069 6.5058594 13.875 C 6.0675579 13.006938 5.0412971 12.005313 3.5039062 12 z M 30.503906 12 C 28.93477 11.9948 27.878577 12.97636 27.445312 13.849609 C 27.012049 14.722858 27 15.564453 27 15.564453 A 1.0001 1.0001 0 0 0 27 15.59375 L 27 35 A 1.0001 1.0001 0 0 0 27.003906 35.078125 C 27.003906 35.078125 27.056966 35.828363 27.539062 36.554688 C 28.021165 37.281011 29.045925 38.004441 30.501953 38.001953 C 31.891644 38.000053 32.883735 37.273604 33.376953 36.578125 C 33.870171 35.882646 33.986328 35.166016 33.986328 35.166016 A 1.0001 1.0001 0 0 0 34 35 L 34 31.802734 L 37.167969 36.554688 L 37.130859 36.494141 C 37.511831 37.164615 38.143096 37.525465 38.742188 37.730469 C 39.341277 37.935473 39.950104 38.001953 40.5 38.001953 C 42.411725 38.001953 44 36.431487 44 34.5 C 44 34.056649 43.908251 34.03442 43.851562 33.912109 C 43.794882 33.789799 43.730864 33.671331 43.654297 33.537109 C 43.501163 33.268666 43.298339 32.944015 43.058594 32.572266 C 42.579103 31.828767 41.950355 30.90254 41.322266 29.992188 C 40.310206 28.525308 39.655222 27.610988 39.300781 27.113281 L 41.707031 24.707031 A 1.0001 1.0001 0 0 0 41.738281 24.673828 C 41.738281 24.673828 42.354706 24.012223 42.748047 23.042969 C 43.141388 22.073714 43.298687 20.56089 42.259766 19.349609 C 41.281705 18.208994 39.842689 18.141009 38.925781 18.416016 C 38.008874 18.691022 37.371094 19.222656 37.371094 19.222656 A 1.0001 1.0001 0 0 0 37.292969 19.292969 L 33.998047 22.587891 L 33.992188 15.646484 A 1.0001 1.0001 0 0 0 33.990234 15.580078 C 33.990234 15.580078 33.944164 14.743069 33.505859 13.875 C 33.067647 13.006938 32.041297 12.005313 30.503906 12 z M 21.507812 18 C 19.85324 17.98686 18.785557 19.124468 18.382812 20.09375 C 18.181441 20.578391 18.090615 21.031738 18.044922 21.375 C 18.022072 21.546631 18.011459 21.69063 18.005859 21.796875 C 18.000252 21.90312 18 22.065333 18 21.984375 L 17.982422 34.998047 A 1.0001 1.0001 0 0 0 17.990234 35.134766 C 17.990234 35.134766 18.085674 35.862804 18.576172 36.568359 C 19.06667 37.273915 20.071581 37.997467 21.486328 38 C 22.885358 38.0026 23.885897 37.278643 24.380859 36.580078 C 24.875822 35.881513 24.986328 35.160156 24.986328 35.160156 A 1.0001 1.0001 0 0 0 25 35 L 25 21.996094 C 25 21.996094 25.02572 21.084043 24.625 20.117188 C 24.224283 19.150332 23.164841 18.013078 21.507812 18 z M 46.5 24 C 44.578848 24 43 25.578848 43 27.5 C 43 29.421152 44.578848 31 46.5 31 C 48.421152 31 50 29.421152 50 27.5 C 50 25.578848 48.421152 24 46.5 24 z M 46.5 26 C 47.340272 26 48 26.659728 48 27.5 C 48 28.340272 47.340272 29 46.5 29 C 45.659728 29 45 28.340272 45 27.5 C 45 26.659728 45.659728 26 46.5 26 z\"/></svg>"),
+	Rules: []string{
+		"||kik.com^",
+	},
 }, {
 	ID:      "lazada",
 	Name:    "Lazada",
@ -1385,6 +1412,7 @@ var blockedServices = []blockedService{{
 	Rules: []string{
 		"||aus.social^",
 		"||awscommunity.social^",
+		"||climatejustice.social^",
 		"||cyberplace.social^",
 		"||defcon.social^",
 		"||det.social^",
@ -1442,13 +1470,13 @@ var blockedServices = []blockedService{{
 		"||mstdn.plus^",
 		"||mstdn.social^",
 		"||muenchen.social^",
-		"||muenster.im^",
 		"||newsie.social^",
 		"||noc.social^",
 		"||norden.social^",
 		"||nrw.social^",
 		"||o3o.ca^",
 		"||ohai.social^",
+		"||pewtix.com^",
 		"||piaille.fr^",
 		"||pol.social^",
 		"||ravenation.club^",
@ -1480,7 +1508,6 @@ var blockedServices = []blockedService{{
 		"||union.place^",
 		"||universeodon.com^",
 		"||urbanists.social^",
-		"||wien.rocks^",
 		"||wxw.moe^",
 	},
 }, {
@ -1827,6 +1854,13 @@ var blockedServices = []blockedService{{
 		"||tx.me^",
 		"||usercontent.dev^",
 	},
+}, {
+	ID:      "tidal",
+	Name:    "Tidal",
+	IconSVG: []byte("<svg xmlns=\"http://www.w3.org/2000/svg\" fill=\"currentColor\" viewBox=\"0 0 50 50\"><path d=\"M 9 12 C 8.7615 12 8.5237969 12.091437 8.3417969 12.273438 L 1.2734375 19.341797 C 0.9094375 19.705797 0.9094375 20.294203 1.2734375 20.658203 L 8.3417969 27.726562 C 8.7057969 28.090563 9.2942031 28.090563 9.6582031 27.726562 L 16.726562 20.658203 C 16.908563 20.476203 17 20.2385 17 20 C 17 19.7615 16.908563 19.523797 16.726562 19.341797 L 9.6582031 12.273438 C 9.4762031 12.091437 9.2385 12 9 12 z M 17 20 C 17 20.2385 17.091438 20.476203 17.273438 20.658203 L 24.341797 27.726562 C 24.523797 27.908563 24.7615 28 25 28 C 25.2385 28 25.476203 27.908563 25.658203 27.726562 L 32.726562 20.658203 C 32.908563 20.476203 33 20.2385 33 20 C 33 19.7615 32.908563 19.523797 32.726562 19.341797 L 25.658203 12.273438 C 25.294203 11.909437 24.705797 11.909437 24.341797 12.273438 L 17.273438 19.341797 C 17.091437 19.523797 17 19.7615 17 20 z M 33 20 C 33 20.2385 33.091437 20.476203 33.273438 20.658203 L 40.341797 27.726562 C 40.705797 28.090563 41.294203 28.090563 41.658203 27.726562 L 48.726562 20.658203 C 49.090563 20.294203 49.090563 19.705797 48.726562 19.341797 L 41.658203 12.273438 C 41.294203 11.909437 40.705797 11.909437 40.341797 12.273438 L 33.273438 19.341797 C 33.091437 19.523797 33 19.7615 33 20 z M 25 28 C 24.7615 28 24.523797 28.091437 24.341797 28.273438 L 17.273438 35.341797 C 16.909437 35.705797 16.909437 36.294203 17.273438 36.658203 L 24.341797 43.726562 C 24.705797 44.090562 25.294203 44.090562 25.658203 43.726562 L 32.726562 36.658203 C 33.090563 36.294203 33.090563 35.705797 32.726562 35.341797 L 25.658203 28.273438 C 25.476203 28.091437 25.2385 28 25 28 z\"/></svg>"),
+	Rules: []string{
+		"||tidal.com^",
+	},
 }, {
 	ID:      "tiktok",
 	Name:    "TikTok",
--- a/internal/home/client.go
+++ b/internal/home/client.go
@ -8,6 +8,7 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering/safesearch"
 	"github.com/AdguardTeam/dnsproxy/proxy"
+	"github.com/AdguardTeam/golibs/stringutil"
 )

 // Client contains information about persistent clients.
@ -37,6 +38,19 @@ type Client struct {
 	IgnoreStatistics      bool
 }

+// ShallowClone returns a deep copy of the client, except upstreamConfig,
+// safeSearchConf, SafeSearch fields, because it's difficult to copy them.
+func (c *Client) ShallowClone() (sh *Client) {
+	clone := *c
+
+	clone.IDs = stringutil.CloneSlice(c.IDs)
+	clone.Tags = stringutil.CloneSlice(c.Tags)
+	clone.BlockedServices = stringutil.CloneSlice(c.BlockedServices)
+	clone.Upstreams = stringutil.CloneSlice(c.Upstreams)
+
+	return &clone
+}
+
 // closeUpstreams closes the client-specific upstream config of c if any.
 func (c *Client) closeUpstreams() (err error) {
 	if c.upstreamConfig != nil {
--- a/internal/home/clients.go
+++ b/internal/home/clients.go
@ -378,6 +378,7 @@ func (clients *clientsContainer) clientOrArtificial(
 	}, true
 }

+// Find returns a shallow copy of the client if there is one found.
 func (clients *clientsContainer) Find(id string) (c *Client, ok bool) {
 	clients.lock.Lock()
 	defer clients.lock.Unlock()
@ -387,20 +388,18 @@ func (clients *clientsContainer) Find(id string) (c *Client, ok bool) {
 		return nil, false
 	}

-	c.IDs = stringutil.CloneSlice(c.IDs)
-	c.Tags = stringutil.CloneSlice(c.Tags)
-	c.BlockedServices = stringutil.CloneSlice(c.BlockedServices)
-	c.Upstreams = stringutil.CloneSlice(c.Upstreams)
-
-	return c, true
+	return c.ShallowClone(), true
 }

 // shouldCountClient is a wrapper around Find to make it a valid client
 // information finder for the statistics.  If no information about the client
 // is found, it returns true.
 func (clients *clientsContainer) shouldCountClient(ids []string) (y bool) {
+	clients.lock.Lock()
+	defer clients.lock.Unlock()
+
 	for _, id := range ids {
-		client, ok := clients.Find(id)
+		client, ok := clients.findLocked(id)
 		if ok {
 			return !client.IgnoreStatistics
 		}
@ -617,6 +616,15 @@ func (clients *clientsContainer) Add(c *Client) (ok bool, err error) {
 		}
 	}

+	clients.add(c)
+
+	log.Debug("clients: added %q: ID:%q [%d]", c.Name, c.IDs, len(clients.list))
+
+	return true, nil
+}
+
+// add c to the indexes. clients.lock is expected to be locked.
+func (clients *clientsContainer) add(c *Client) {
 	// update Name index
 	clients.list[c.Name] = c

@ -624,10 +632,6 @@ func (clients *clientsContainer) Add(c *Client) (ok bool, err error) {
 	for _, id := range c.IDs {
 		clients.idIndex[id] = c
 	}
-
-	log.Debug("clients: added %q: ID:%q [%d]", c.Name, c.IDs, len(clients.list))
-
-	return true, nil
 }

 // Del removes a client.  ok is false if there is no such client.
@ -645,86 +649,53 @@ func (clients *clientsContainer) Del(name string) (ok bool) {
 		log.Error("client container: removing client %s: %s", name, err)
 	}

+	clients.del(c)
+
+	return true
+}
+
+// del removes c from the indexes. clients.lock is expected to be locked.
+func (clients *clientsContainer) del(c *Client) {
 	// update Name index
-	delete(clients.list, name)
+	delete(clients.list, c.Name)

 	// update ID index
 	for _, id := range c.IDs {
 		delete(clients.idIndex, id)
 	}
-
-	return true
 }

 // Update updates a client by its name.
-func (clients *clientsContainer) Update(name string, c *Client) (err error) {
+func (clients *clientsContainer) Update(prev, c *Client) (err error) {
 	err = clients.check(c)
 	if err != nil {
+		// Don't wrap the error since it's informative enough as is.
 		return err
 	}

 	clients.lock.Lock()
 	defer clients.lock.Unlock()

-	prev, ok := clients.list[name]
-	if !ok {
-		return errors.Error("client not found")
-	}
-
-	// First, check the name index.
+	// Check the name index.
 	if prev.Name != c.Name {
-		_, ok = clients.list[c.Name]
+		_, ok := clients.list[c.Name]
 		if ok {
 			return errors.Error("client already exists")
 		}
 	}

-	// Second, update the ID index.
-	err = clients.updateIDIndex(prev, c.IDs)
-	if err != nil {
-		// Don't wrap the error, because it's informative enough as is.
-		return err
-	}
-
-	// Update name index.
-	if prev.Name != c.Name {
-		delete(clients.list, prev.Name)
-		clients.list[c.Name] = prev
-	}
-
-	// Update upstreams cache.
-	err = c.closeUpstreams()
-	if err != nil {
-		return err
-	}
-
-	*prev = *c
-
-	return nil
-}
-
-// updateIDIndex updates the ID index data for cli using the information from
-// newIDs.
-func (clients *clientsContainer) updateIDIndex(cli *Client, newIDs []string) (err error) {
-	if slices.Equal(cli.IDs, newIDs) {
-		return nil
-	}
-
-	for _, id := range newIDs {
+	// Check the ID index.
+	if !slices.Equal(prev.IDs, c.IDs) {
+		for _, id := range c.IDs {
 			existing, ok := clients.idIndex[id]
-		if ok && existing != cli {
+			if ok && existing != prev {
 				return fmt.Errorf("id %q is used by client with name %q", id, existing.Name)
 			}
 		}
-
-	// Update the IDs in the index.
-	for _, id := range cli.IDs {
-		delete(clients.idIndex, id)
 	}

-	for _, id := range newIDs {
-		clients.idIndex[id] = cli
-	}
+	clients.del(prev)
+	clients.add(c)

 	return nil
 }
--- a/internal/home/clients_test.go
+++ b/internal/home/clients_test.go
@ -98,22 +98,8 @@ func TestClients(t *testing.T) {
 		assert.False(t, ok)
 	})

-	t.Run("update_fail_name", func(t *testing.T) {
-		err := clients.Update("client3", &Client{
-			IDs:  []string{"1.2.3.0"},
-			Name: "client3",
-		})
-		require.Error(t, err)
-
-		err = clients.Update("client3", &Client{
-			IDs:  []string{"1.2.3.0"},
-			Name: "client2",
-		})
-		assert.Error(t, err)
-	})
-
 	t.Run("update_fail_ip", func(t *testing.T) {
-		err := clients.Update("client1", &Client{
+		err := clients.Update(&Client{Name: "client1"}, &Client{
 			IDs:  []string{"2.2.2.2"},
 			Name: "client1",
 		})
@ -129,7 +115,10 @@ func TestClients(t *testing.T) {
 			cliNewIP = netip.MustParseAddr(cliNew)
 		)

-		err := clients.Update("client1", &Client{
+		prev, ok := clients.list["client1"]
+		require.True(t, ok)
+
+		err := clients.Update(prev, &Client{
 			IDs:  []string{cliNew},
 			Name: "client1",
 		})
@ -138,7 +127,10 @@ func TestClients(t *testing.T) {
 		assert.Equal(t, clients.clientSource(cliOldIP), ClientSourceNone)
 		assert.Equal(t, clients.clientSource(cliNewIP), ClientSourcePersistent)

-		err = clients.Update("client1", &Client{
+		prev, ok = clients.list["client1"]
+		require.True(t, ok)
+
+		err = clients.Update(prev, &Client{
 			IDs:            []string{cliNew},
 			Name:           "client1-renamed",
 			UseOwnSettings: true,
--- a/internal/home/clientshttp.go
+++ b/internal/home/clientshttp.go
@ -289,7 +289,7 @@ func (clients *clientsContainer) handleUpdateClient(w http.ResponseWriter, r *ht
 		return
 	}

-	err = clients.Update(dj.Name, c)
+	err = clients.Update(prev, c)
 	if err != nil {
 		aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)

--- a/internal/home/config.go
+++ b/internal/home/config.go
@ -399,19 +399,39 @@ func (c *configuration) getConfigFilename() string {
 	return configFile
 }

-// getLogSettings reads logging settings from the config file.
-// we do it in a separate method in order to configure logger before the actual configuration is parsed and applied.
-func getLogSettings() logSettings {
-	l := logSettings{}
+// readLogSettings reads logging settings from the config file.  We do it in a
+// separate method in order to configure logger before the actual configuration
+// is parsed and applied.
+func readLogSettings() (ls *logSettings) {
+	ls = &logSettings{}
+
 	yamlFile, err := readConfigFile()
 	if err != nil {
-		return l
+		return ls
 	}
-	err = yaml.Unmarshal(yamlFile, &l)
+
+	err = yaml.Unmarshal(yamlFile, ls)
 	if err != nil {
 		log.Error("Couldn't get logging settings from the configuration: %s", err)
 	}
-	return l
+
+	return ls
+}
+
+// validateBindHosts returns error if any of binding hosts from configuration is
+// not a valid IP address.
+func validateBindHosts(conf *configuration) (err error) {
+	if !conf.BindHost.IsValid() {
+		return errors.Error("bind_host is not a valid ip address")
+	}
+
+	for i, addr := range conf.DNS.BindHosts {
+		if !addr.IsValid() {
+			return fmt.Errorf("dns.bind_hosts at index %d is not a valid ip address", i)
+		}
+	}
+
+	return nil
 }

 // parseConfig loads configuration from the YAML file
@ -425,6 +445,13 @@ func parseConfig() (err error) {
 	config.fileData = nil
 	err = yaml.Unmarshal(fileData, &config)
 	if err != nil {
+		// Don't wrap the error since it's informative enough as is.
+		return err
+	}
+
+	err = validateBindHosts(config)
+	if err != nil {
+		// Don't wrap the error since it's informative enough as is.
 		return err
 	}

--- a/internal/home/control.go
+++ b/internal/home/control.go
@ -180,7 +180,7 @@ func registerControlHandlers() {
 	httpRegister(http.MethodGet, "/control/status", handleStatus)
 	httpRegister(http.MethodPost, "/control/i18n/change_language", handleI18nChangeLanguage)
 	httpRegister(http.MethodGet, "/control/i18n/current_language", handleI18nCurrentLanguage)
-	Context.mux.HandleFunc("/control/version.json", postInstall(optionalAuth(handleGetVersionJSON)))
+	Context.mux.HandleFunc("/control/version.json", postInstall(optionalAuth(handleVersionJSON)))
 	httpRegister(http.MethodPost, "/control/update", handleUpdate)
 	httpRegister(http.MethodGet, "/control/profile", handleGetProfile)
 	httpRegister(http.MethodPut, "/control/profile/update", handlePutProfile)
--- a/internal/home/controlupdate.go
+++ b/internal/home/controlupdate.go
@ -26,15 +26,14 @@ type temporaryError interface {
 	Temporary() (ok bool)
 }

-// Get the latest available version from the Internet
-func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
+// handleVersionJSON is the handler for the POST /control/version.json HTTP API.
+//
+// TODO(a.garipov): Find out if this API used with a GET method by anyone.
+func handleVersionJSON(w http.ResponseWriter, r *http.Request) {
 	resp := &versionResponse{}
 	if Context.disableUpdate {
 		resp.Disabled = true
-		err := json.NewEncoder(w).Encode(resp)
-		if err != nil {
-			aghhttp.Error(r, w, http.StatusInternalServerError, "writing body: %s", err)
-		}
+		_ = aghhttp.WriteJSONResponse(w, r, resp)

 		return
 	}
--- a/internal/home/home.go
+++ b/internal/home/home.go
@ -27,14 +27,17 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
 	"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
+	"github.com/AdguardTeam/AdGuardHome/internal/filtering/hashprefix"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering/safesearch"
 	"github.com/AdguardTeam/AdGuardHome/internal/querylog"
 	"github.com/AdguardTeam/AdGuardHome/internal/stats"
 	"github.com/AdguardTeam/AdGuardHome/internal/updater"
 	"github.com/AdguardTeam/AdGuardHome/internal/version"
+	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/netutil"
+	"github.com/AdguardTeam/golibs/stringutil"
 	"golang.org/x/exp/slices"
 	"gopkg.in/natefinch/lumberjack.v2"
 )
@ -143,7 +146,9 @@ func Main(clientBuildFS fs.FS) {
 	run(opts, clientBuildFS)
 }

-func setupContext(opts options) {
+// setupContext initializes [Context] fields.  It also reads and upgrades
+// config file if necessary.
+func setupContext(opts options) (err error) {
 	setupContextFlags(opts)

 	Context.tlsRoots = aghtls.SystemRootCAs()
@ -160,10 +165,15 @@ func setupContext(opts options) {
 		},
 	}

+	Context.mux = http.NewServeMux()
+
 	if !Context.firstRun {
 		// Do the upgrade if necessary.
-		err := upgradeConfig()
-		fatalOnError(err)
+		err = upgradeConfig()
+		if err != nil {
+			// Don't wrap the error, because it's informative enough as is.
+			return err
+		}

 		if err = parseConfig(); err != nil {
 			log.Error("parsing configuration file: %s", err)
@ -179,11 +189,14 @@ func setupContext(opts options) {

 		if !opts.noEtcHosts && config.Clients.Sources.HostsFile {
 			err = setupHostsContainer()
-			fatalOnError(err)
+			if err != nil {
+				// Don't wrap the error, because it's informative enough as is.
+				return err
+			}
 		}
 	}

-	Context.mux = http.NewServeMux()
+	return nil
 }

 // setupContextFlags sets global flags and prints their status to the log.
@ -285,25 +298,27 @@ func setupHostsContainer() (err error) {
 	return nil
 }

-func setupConfig(opts options) (err error) {
-	config.DNS.DnsfilterConf.EtcHosts = Context.etcHosts
-	config.DNS.DnsfilterConf.ConfigModified = onConfigModified
-	config.DNS.DnsfilterConf.HTTPRegister = httpRegister
-	config.DNS.DnsfilterConf.DataDir = Context.getDataDir()
-	config.DNS.DnsfilterConf.Filters = slices.Clone(config.Filters)
-	config.DNS.DnsfilterConf.WhitelistFilters = slices.Clone(config.WhitelistFilters)
-	config.DNS.DnsfilterConf.UserRules = slices.Clone(config.UserRules)
-	config.DNS.DnsfilterConf.HTTPClient = Context.client
-
-	config.DNS.DnsfilterConf.SafeSearchConf.CustomResolver = safeSearchResolver{}
-	config.DNS.DnsfilterConf.SafeSearch, err = safesearch.NewDefault(
-		config.DNS.DnsfilterConf.SafeSearchConf,
-		"default",
-		config.DNS.DnsfilterConf.SafeSearchCacheSize,
-		time.Minute*time.Duration(config.DNS.DnsfilterConf.CacheTime),
-	)
+// setupOpts sets up command-line options.
+func setupOpts(opts options) (err error) {
+	err = setupBindOpts(opts)
 	if err != nil {
-		return fmt.Errorf("initializing safesearch: %w", err)
+		// Don't wrap the error, because it's informative enough as is.
+		return err
+	}
+
+	if len(opts.pidFile) != 0 && writePIDFile(opts.pidFile) {
+		Context.pidFileName = opts.pidFile
+	}
+
+	return nil
+}
+
+// initContextClients initializes Context clients and related fields.
+func initContextClients() (err error) {
+	err = setupDNSFilteringConf(config.DNS.DnsfilterConf)
+	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
+		return err
 	}

 	//lint:ignore SA1019  Migration is not over.
@ -338,8 +353,19 @@ func setupConfig(opts options) (err error) {
 		arpdb = aghnet.NewARPDB()
 	}

-	Context.clients.Init(config.Clients.Persistent, Context.dhcpServer, Context.etcHosts, arpdb, config.DNS.DnsfilterConf)
+	Context.clients.Init(
+		config.Clients.Persistent,
+		Context.dhcpServer,
+		Context.etcHosts,
+		arpdb,
+		config.DNS.DnsfilterConf,
+	)

+	return nil
+}
+
+// setupBindOpts overrides bind host/port from the opts.
+func setupBindOpts(opts options) (err error) {
 	if opts.bindPort != 0 {
 		config.BindPort = opts.bindPort

@ -350,12 +376,83 @@ func setupConfig(opts options) (err error) {
 		}
 	}

-	// override bind host/port from the console
 	if opts.bindHost.IsValid() {
 		config.BindHost = opts.bindHost
 	}
-	if len(opts.pidFile) != 0 && writePIDFile(opts.pidFile) {
-		Context.pidFileName = opts.pidFile
+
+	return nil
+}
+
+// setupDNSFilteringConf sets up DNS filtering configuration settings.
+func setupDNSFilteringConf(conf *filtering.Config) (err error) {
+	const (
+		dnsTimeout = 3 * time.Second
+
+		sbService                 = "safe browsing"
+		defaultSafeBrowsingServer = `https://family.adguard-dns.com/dns-query`
+		sbTXTSuffix               = `sb.dns.adguard.com.`
+
+		pcService             = "parental control"
+		defaultParentalServer = `https://family.adguard-dns.com/dns-query`
+		pcTXTSuffix           = `pc.dns.adguard.com.`
+	)
+
+	conf.EtcHosts = Context.etcHosts
+	conf.ConfigModified = onConfigModified
+	conf.HTTPRegister = httpRegister
+	conf.DataDir = Context.getDataDir()
+	conf.Filters = slices.Clone(config.Filters)
+	conf.WhitelistFilters = slices.Clone(config.WhitelistFilters)
+	conf.UserRules = slices.Clone(config.UserRules)
+	conf.HTTPClient = Context.client
+
+	cacheTime := time.Duration(conf.CacheTime) * time.Minute
+
+	upsOpts := &upstream.Options{
+		Timeout: dnsTimeout,
+		ServerIPAddrs: []net.IP{
+			{94, 140, 14, 15},
+			{94, 140, 15, 16},
+			net.ParseIP("2a10:50c0::bad1:ff"),
+			net.ParseIP("2a10:50c0::bad2:ff"),
+		},
+	}
+
+	sbUps, err := upstream.AddressToUpstream(defaultSafeBrowsingServer, upsOpts)
+	if err != nil {
+		return fmt.Errorf("converting safe browsing server: %w", err)
+	}
+
+	conf.SafeBrowsingChecker = hashprefix.New(&hashprefix.Config{
+		Upstream:    sbUps,
+		ServiceName: sbService,
+		TXTSuffix:   sbTXTSuffix,
+		CacheTime:   cacheTime,
+		CacheSize:   conf.SafeBrowsingCacheSize,
+	})
+
+	parUps, err := upstream.AddressToUpstream(defaultParentalServer, upsOpts)
+	if err != nil {
+		return fmt.Errorf("converting parental server: %w", err)
+	}
+
+	conf.ParentalControlChecker = hashprefix.New(&hashprefix.Config{
+		Upstream:    parUps,
+		ServiceName: pcService,
+		TXTSuffix:   pcTXTSuffix,
+		CacheTime:   cacheTime,
+		CacheSize:   conf.SafeBrowsingCacheSize,
+	})
+
+	conf.SafeSearchConf.CustomResolver = safeSearchResolver{}
+	conf.SafeSearch, err = safesearch.NewDefault(
+		conf.SafeSearchConf,
+		"default",
+		conf.SafeSearchCacheSize,
+		cacheTime,
+	)
+	if err != nil {
+		return fmt.Errorf("initializing safesearch: %w", err)
 	}

 	return nil
@ -432,14 +529,16 @@ func fatalOnError(err error) {

 // run configures and starts AdGuard Home.
 func run(opts options, clientBuildFS fs.FS) {
-	// configure config filename
+	// Configure config filename.
 	initConfigFilename(opts)

-	// configure working dir and config path
-	initWorkingDir(opts)
+	// Configure working dir and config path.
+	err := initWorkingDir(opts)
+	fatalOnError(err)

-	// configure log level and output
-	configureLogger(opts)
+	// Configure log level and output.
+	err = configureLogger(opts)
+	fatalOnError(err)

 	// Print the first message after logger is configured.
 	log.Info(version.Full())
@ -448,17 +547,21 @@ func run(opts options, clientBuildFS fs.FS) {
 		log.Info("AdGuard Home is running as a service")
 	}

-	setupContext(opts)
-
-	err := configureOS(config)
+	err = setupContext(opts)
 	fatalOnError(err)

-	// clients package uses filtering package's static data (filtering.BlockedSvcKnown()),
-	//  so we have to initialize filtering's static data first,
-	//  but also avoid relying on automatic Go init() function
+	err = configureOS(config)
+	fatalOnError(err)
+
+	// Clients package uses filtering package's static data
+	// (filtering.BlockedSvcKnown()), so we have to initialize filtering static
+	// data first, but also to avoid relying on automatic Go init() function.
 	filtering.InitModule()

-	err = setupConfig(opts)
+	err = initContextClients()
+	fatalOnError(err)
+
+	err = setupOpts(opts)
 	fatalOnError(err)

 	// TODO(e.burkov): This could be made earlier, probably as the option's
@ -466,7 +569,7 @@ func run(opts options, clientBuildFS fs.FS) {
 	cmdlineUpdate(opts)

 	if !Context.firstRun {
-		// Save the updated config
+		// Save the updated config.
 		err = config.write()
 		fatalOnError(err)

@ -476,33 +579,15 @@ func run(opts options, clientBuildFS fs.FS) {
 		}
 	}

-	err = os.MkdirAll(Context.getDataDir(), 0o755)
-	if err != nil {
-		log.Fatalf("Cannot create DNS data dir at %s: %s", Context.getDataDir(), err)
-	}
+	dir := Context.getDataDir()
+	err = os.MkdirAll(dir, 0o755)
+	fatalOnError(errors.Annotate(err, "creating DNS data dir at %s: %w", dir))

-	sessFilename := filepath.Join(Context.getDataDir(), "sessions.db")
 	GLMode = opts.glinetMode
-	var rateLimiter *authRateLimiter
-	if config.AuthAttempts > 0 && config.AuthBlockMin > 0 {
-		rateLimiter = newAuthRateLimiter(
-			time.Duration(config.AuthBlockMin)*time.Minute,
-			config.AuthAttempts,
-		)
-	} else {
-		log.Info("authratelimiter is disabled")
-	}

-	Context.auth = InitAuth(
-		sessFilename,
-		config.Users,
-		config.WebSessionTTLHours*60*60,
-		rateLimiter,
-	)
-	if Context.auth == nil {
-		log.Fatalf("Couldn't initialize Auth module")
-	}
-	config.Users = nil
+	// Init auth module.
+	Context.auth, err = initUsers()
+	fatalOnError(err)

 	Context.tls, err = newTLSManager(config.TLS)
 	if err != nil {
@ -520,10 +605,10 @@ func run(opts options, clientBuildFS fs.FS) {
 		Context.tls.start()

 		go func() {
-			serr := startDNSServer()
-			if serr != nil {
+			sErr := startDNSServer()
+			if sErr != nil {
 				closeDNSServer()
-				fatalOnError(serr)
+				fatalOnError(sErr)
 			}
 		}()

@ -537,10 +622,33 @@ func run(opts options, clientBuildFS fs.FS) {

 	Context.web.start()

-	// wait indefinitely for other go-routines to complete their job
+	// Wait indefinitely for other goroutines to complete their job.
 	select {}
 }

+// initUsers initializes context auth module.  Clears config users field.
+func initUsers() (auth *Auth, err error) {
+	sessFilename := filepath.Join(Context.getDataDir(), "sessions.db")
+
+	var rateLimiter *authRateLimiter
+	if config.AuthAttempts > 0 && config.AuthBlockMin > 0 {
+		blockDur := time.Duration(config.AuthBlockMin) * time.Minute
+		rateLimiter = newAuthRateLimiter(blockDur, config.AuthAttempts)
+	} else {
+		log.Info("authratelimiter is disabled")
+	}
+
+	sessionTTL := config.WebSessionTTLHours * 60 * 60
+	auth = InitAuth(sessFilename, config.Users, sessionTTL, rateLimiter)
+	if auth == nil {
+		return nil, errors.Error("initializing auth module failed")
+	}
+
+	config.Users = nil
+
+	return auth, nil
+}
+
 func (c *configuration) anonymizer() (ipmut *aghnet.IPMut) {
 	var anonFunc aghnet.IPMutFunc
 	if c.DNS.AnonymizeClientIP {
@ -613,22 +721,19 @@ func writePIDFile(fn string) bool {
 	return true
 }

+// initConfigFilename sets up context config file path.  This file path can be
+// overridden by command-line arguments, or is set to default.
 func initConfigFilename(opts options) {
-	// config file path can be overridden by command-line arguments:
-	if opts.confFilename != "" {
-		Context.configFilename = opts.confFilename
-	} else {
-		// Default config file name
-		Context.configFilename = "AdGuardHome.yaml"
-	}
+	Context.configFilename = stringutil.Coalesce(opts.confFilename, "AdGuardHome.yaml")
 }

-// initWorkingDir initializes the workDir
-// if no command-line arguments specified, we use the directory where our binary file is located
-func initWorkingDir(opts options) {
+// initWorkingDir initializes the workDir.  If no command-line arguments are
+// specified, the directory with the binary file is used.
+func initWorkingDir(opts options) (err error) {
 	execPath, err := os.Executable()
 	if err != nil {
-		panic(err)
+		// Don't wrap the error, because it's informative enough as is.
+		return err
 	}

 	if opts.workDir != "" {
@ -640,34 +745,20 @@ func initWorkingDir(opts options) {

 	workDir, err := filepath.EvalSymlinks(Context.workDir)
 	if err != nil {
-		panic(err)
+		// Don't wrap the error, because it's informative enough as is.
+		return err
 	}

 	Context.workDir = workDir
+
+	return nil
 }

-// configureLogger configures logger level and output
-func configureLogger(opts options) {
-	ls := getLogSettings()
+// configureLogger configures logger level and output.
+func configureLogger(opts options) (err error) {
+	ls := getLogSettings(opts)

-	// command-line arguments can override config settings
-	if opts.verbose || config.Verbose {
-		ls.Verbose = true
-	}
-	if opts.logFile != "" {
-		ls.File = opts.logFile
-	} else if config.File != "" {
-		ls.File = config.File
-	}
-
-	// Handle default log settings overrides
-	ls.Compress = config.Compress
-	ls.LocalTime = config.LocalTime
-	ls.MaxBackups = config.MaxBackups
-	ls.MaxSize = config.MaxSize
-	ls.MaxAge = config.MaxAge
-
-	// log.SetLevel(log.INFO) - default
+	// Configure logger level.
 	if ls.Verbose {
 		log.SetLevel(log.DEBUG)
 	}
@ -676,24 +767,21 @@ func configureLogger(opts options) {
 	// happen pretty quickly.
 	log.SetFlags(log.LstdFlags | log.Lmicroseconds)

-	if opts.runningAsService && ls.File == "" && runtime.GOOS == "windows" {
-		// When running as a Windows service, use eventlog by default if nothing
-		// else is configured.  Otherwise, we'll simply lose the log output.
-		ls.File = configSyslog
-	}
-
-	// logs are written to stdout (default)
+	// Write logs to stdout by default.
 	if ls.File == "" {
-		return
+		return nil
 	}

 	if ls.File == configSyslog {
-		// Use syslog where it is possible and eventlog on Windows
-		err := aghos.ConfigureSyslog(serviceName)
+		// Use syslog where it is possible and eventlog on Windows.
+		err = aghos.ConfigureSyslog(serviceName)
 		if err != nil {
-			log.Fatalf("cannot initialize syslog: %s", err)
+			return fmt.Errorf("cannot initialize syslog: %w", err)
 		}
-	} else {
+
+		return nil
+	}
+
 	logFilePath := ls.File
 	if !filepath.IsAbs(logFilePath) {
 		logFilePath = filepath.Join(Context.workDir, logFilePath)
@ -701,13 +789,41 @@ func configureLogger(opts options) {

 	log.SetOutput(&lumberjack.Logger{
 		Filename:   logFilePath,
-			Compress:   ls.Compress, // disabled by default
+		Compress:   ls.Compress,
 		LocalTime:  ls.LocalTime,
 		MaxBackups: ls.MaxBackups,
-			MaxSize:    ls.MaxSize, // megabytes
-			MaxAge:     ls.MaxAge,  // days
+		MaxSize:    ls.MaxSize,
+		MaxAge:     ls.MaxAge,
 	})
+
+	return nil
 }
+
+// getLogSettings returns a log settings object properly initialized from opts.
+func getLogSettings(opts options) (ls *logSettings) {
+	ls = readLogSettings()
+
+	// Command-line arguments can override config settings.
+	if opts.verbose || config.Verbose {
+		ls.Verbose = true
+	}
+
+	ls.File = stringutil.Coalesce(opts.logFile, config.File, ls.File)
+
+	// Handle default log settings overrides.
+	ls.Compress = config.Compress
+	ls.LocalTime = config.LocalTime
+	ls.MaxBackups = config.MaxBackups
+	ls.MaxSize = config.MaxSize
+	ls.MaxAge = config.MaxAge
+
+	if opts.runningAsService && ls.File == "" && runtime.GOOS == "windows" {
+		// When running as a Windows service, use eventlog by default if
+		// nothing else is configured.  Otherwise, we'll lose the log output.
+		ls.File = configSyslog
+	}
+
+	return ls
 }

 // cleanup stops and resets all the modules.
--- a/internal/home/service.go
+++ b/internal/home/service.go
@ -4,7 +4,6 @@ import (
 	"fmt"
 	"io/fs"
 	"os"
-	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
@ -84,14 +83,9 @@ func svcStatus(s service.Service) (status service.Status, err error) {
 // On OpenWrt, the service utility may not exist.  We use our service script
 // directly in this case.
 func svcAction(s service.Service, action string) (err error) {
-	if runtime.GOOS == "darwin" && action == "start" {
-		var exe string
-		if exe, err = os.Executable(); err != nil {
-			log.Error("starting service: getting executable path: %s", err)
-		} else if exe, err = filepath.EvalSymlinks(exe); err != nil {
-			log.Error("starting service: evaluating executable symlinks: %s", err)
-		} else if !strings.HasPrefix(exe, "/Applications/") {
-			log.Info("warning: service must be started from within the /Applications directory")
+	if action == "start" {
+		if err = aghos.PreCheckActionStart(); err != nil {
+			log.Error("starting service: %s", err)
 		}
 	}

@ -99,8 +93,6 @@ func svcAction(s service.Service, action string) (err error) {
 	if err != nil && service.Platform() == "unix-systemv" &&
 		(action == "start" || action == "stop" || action == "restart") {
 		_, err = runInitdCommand(action)
-
-		return err
 	}

 	return err
@ -224,6 +216,7 @@ func handleServiceControlAction(opts options, clientBuildFS fs.FS) {

 	runOpts := opts
 	runOpts.serviceControlAction = "run"
+
 	svcConfig := &service.Config{
 		Name:             serviceName,
 		DisplayName:      serviceDisplayName,
@ -233,35 +226,48 @@ func handleServiceControlAction(opts options, clientBuildFS fs.FS) {
 	}
 	configureService(svcConfig)

-	prg := &program{
-		clientBuildFS: clientBuildFS,
-		opts:          runOpts,
-	}
-	var s service.Service
-	if s, err = service.New(prg, svcConfig); err != nil {
+	s, err := service.New(&program{clientBuildFS: clientBuildFS, opts: runOpts}, svcConfig)
+	if err != nil {
 		log.Fatalf("service: initializing service: %s", err)
 	}

+	err = handleServiceCommand(s, action, opts)
+	if err != nil {
+		log.Fatalf("service: %s", err)
+	}
+
+	log.Printf(
+		"service: action %s has been done successfully on %s",
+		action,
+		service.ChosenSystem(),
+	)
+}
+
+// handleServiceCommand handles service command.
+func handleServiceCommand(s service.Service, action string, opts options) (err error) {
 	switch action {
 	case "status":
 		handleServiceStatusCommand(s)
 	case "run":
 		if err = s.Run(); err != nil {
-			log.Fatalf("service: failed to run service: %s", err)
+			return fmt.Errorf("failed to run service: %w", err)
 		}
 	case "install":
 		initConfigFilename(opts)
-		initWorkingDir(opts)
+		if err = initWorkingDir(opts); err != nil {
+			return fmt.Errorf("failed to init working dir: %w", err)
+		}
+
 		handleServiceInstallCommand(s)
 	case "uninstall":
 		handleServiceUninstallCommand(s)
 	default:
 		if err = svcAction(s, action); err != nil {
-			log.Fatalf("service: executing action %q: %s", action, err)
+			return fmt.Errorf("executing action %q: %w", action, err)
 		}
 	}

-	log.Printf("service: action %s has been done successfully on %s", action, service.ChosenSystem())
+	return nil
 }

 // handleServiceStatusCommand handles service "status" command.
--- a/internal/home/tls.go
+++ b/internal/home/tls.go
@ -172,9 +172,32 @@ func loadTLSConf(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error
 		}
 	}()

-	tlsConf.CertificateChainData = []byte(tlsConf.CertificateChain)
-	tlsConf.PrivateKeyData = []byte(tlsConf.PrivateKey)
+	err = loadCertificateChainData(tlsConf, status)
+	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
+		return err
+	}

+	err = loadPrivateKeyData(tlsConf, status)
+	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
+		return err
+	}
+
+	err = validateCertificates(
+		status,
+		tlsConf.CertificateChainData,
+		tlsConf.PrivateKeyData,
+		tlsConf.ServerName,
+	)
+
+	return errors.Annotate(err, "validating certificate pair: %w")
+}
+
+// loadCertificateChainData loads PEM-encoded certificates chain data to the
+// TLS configuration.
+func loadCertificateChainData(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error) {
+	tlsConf.CertificateChainData = []byte(tlsConf.CertificateChain)
 	if tlsConf.CertificatePath != "" {
 		if tlsConf.CertificateChain != "" {
 			return errors.Error("certificate data and file can't be set together")
@ -190,6 +213,13 @@ func loadTLSConf(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error
 		status.ValidCert = true
 	}

+	return nil
+}
+
+// loadPrivateKeyData loads PEM-encoded private key data to the TLS
+// configuration.
+func loadPrivateKeyData(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error) {
+	tlsConf.PrivateKeyData = []byte(tlsConf.PrivateKey)
 	if tlsConf.PrivateKeyPath != "" {
 		if tlsConf.PrivateKey != "" {
 			return errors.Error("private key data and file can't be set together")
@ -203,16 +233,6 @@ func loadTLSConf(tlsConf *tlsConfigSettings, status *tlsConfigStatus) (err error
 		status.ValidKey = true
 	}

-	err = validateCertificates(
-		status,
-		tlsConf.CertificateChainData,
-		tlsConf.PrivateKeyData,
-		tlsConf.ServerName,
-	)
-	if err != nil {
-		return fmt.Errorf("validating certificate pair: %w", err)
-	}
-
 	return nil
 }

--- a/internal/home/upgrade.go
+++ b/internal/home/upgrade.go
@ -41,7 +41,8 @@ func upgradeConfig() error {

 	err = yaml.Unmarshal(body, &diskConf)
 	if err != nil {
-		log.Printf("Couldn't parse config file: %s", err)
+		log.Printf("parsing config file for upgrade: %s", err)
+
 		return err
 	}

@ -293,71 +294,61 @@ func upgradeSchema4to5(diskConf yobj) error {
 	return nil
 }

-// clients:
+// upgradeSchema5to6 performs the following changes:
+//
+//	# BEFORE:
+//	  'clients':
 //	    ...
+//	    'ip': 127.0.0.1
+//	    'mac': ...
 //
-//	ip: 127.0.0.1
-//	mac: ...
-//
-// ->
-//
-// clients:
+//	# AFTER:
+//	  'clients':
 //	    ...
-//
-//	ids:
+//	    'ids':
 //		  - 127.0.0.1
 //		  - ...
 func upgradeSchema5to6(diskConf yobj) error {
-	log.Printf("%s(): called", funcName())
-
+	log.Printf("Upgrade yaml: 5 to 6")
 	diskConf["schema_version"] = 6

-	clients, ok := diskConf["clients"]
+	clientsVal, ok := diskConf["clients"]
 	if !ok {
 		return nil
 	}

-	switch arr := clients.(type) {
-	case []any:
-		for i := range arr {
-			switch c := arr[i].(type) {
-			case map[any]any:
-				var ipVal any
-				ipVal, ok = c["ip"]
-				ids := []string{}
-				if ok {
-					var ip string
-					ip, ok = ipVal.(string)
+	clients, ok := clientsVal.([]yobj)
 	if !ok {
-						log.Fatalf("client.ip is not a string: %v", ipVal)
-						return nil
+		return fmt.Errorf("unexpected type of clients: %T", clientsVal)
 	}
-					if len(ip) != 0 {
+
+	for i := range clients {
+		c := clients[i]
+		var ids []string
+
+		if ipVal, hasIP := c["ip"]; hasIP {
+			var ip string
+			if ip, ok = ipVal.(string); !ok {
+				return fmt.Errorf("client.ip is not a string: %v", ipVal)
+			}
+
+			if ip != "" {
 				ids = append(ids, ip)
 			}
 		}

-				var macVal any
-				macVal, ok = c["mac"]
-				if ok {
+		if macVal, hasMac := c["mac"]; hasMac {
 			var mac string
-					mac, ok = macVal.(string)
-					if !ok {
-						log.Fatalf("client.mac is not a string: %v", macVal)
-						return nil
+			if mac, ok = macVal.(string); !ok {
+				return fmt.Errorf("client.mac is not a string: %v", macVal)
 			}
-					if len(mac) != 0 {
+
+			if mac != "" {
 				ids = append(ids, mac)
 			}
 		}

 		c["ids"] = ids
-			default:
-				continue
-			}
-		}
-	default:
-		return nil
 	}

 	return nil
--- a/internal/home/upgrade_test.go
+++ b/internal/home/upgrade_test.go
@ -68,6 +68,95 @@ func TestUpgradeSchema2to3(t *testing.T) {
 	assertEqualExcept(t, oldDiskConf, diskConf, excludedEntries, excludedEntries)
 }

+func TestUpgradeSchema5to6(t *testing.T) {
+	const newSchemaVer = 6
+
+	testCases := []struct {
+		in      yobj
+		want    yobj
+		wantErr string
+		name    string
+	}{{
+		in: yobj{
+			"clients": []yobj{},
+		},
+		want: yobj{
+			"clients":        []yobj{},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "",
+		name:    "no_clients",
+	}, {
+		in: yobj{
+			"clients": []yobj{{"ip": "127.0.0.1"}},
+		},
+		want: yobj{
+			"clients": []yobj{{
+				"ids": []string{"127.0.0.1"},
+				"ip":  "127.0.0.1",
+			}},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "",
+		name:    "client_ip",
+	}, {
+		in: yobj{
+			"clients": []yobj{{"mac": "mac"}},
+		},
+		want: yobj{
+			"clients": []yobj{{
+				"ids": []string{"mac"},
+				"mac": "mac",
+			}},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "",
+		name:    "client_mac",
+	}, {
+		in: yobj{
+			"clients": []yobj{{"ip": "127.0.0.1", "mac": "mac"}},
+		},
+		want: yobj{
+			"clients": []yobj{{
+				"ids": []string{"127.0.0.1", "mac"},
+				"ip":  "127.0.0.1",
+				"mac": "mac",
+			}},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "",
+		name:    "client_ip_mac",
+	}, {
+		in: yobj{
+			"clients": []yobj{{"ip": 1, "mac": "mac"}},
+		},
+		want: yobj{
+			"clients":        []yobj{{"ip": 1, "mac": "mac"}},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "client.ip is not a string: 1",
+		name:    "inv_client_ip",
+	}, {
+		in: yobj{
+			"clients": []yobj{{"ip": "127.0.0.1", "mac": 1}},
+		},
+		want: yobj{
+			"clients":        []yobj{{"ip": "127.0.0.1", "mac": 1}},
+			"schema_version": newSchemaVer,
+		},
+		wantErr: "client.mac is not a string: 1",
+		name:    "inv_client_mac",
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := upgradeSchema5to6(tc.in)
+			testutil.AssertErrorMsg(t, tc.wantErr, err)
+			assert.Equal(t, tc.want, tc.in)
+		})
+	}
+}
+
 func TestUpgradeSchema7to8(t *testing.T) {
 	const host = "1.2.3.4"
 	oldConf := yobj{
--- a/internal/querylog/decode.go
+++ b/internal/querylog/decode.go
@ -3,19 +3,24 @@ package querylog
 import (
 	"encoding/base64"
 	"encoding/json"
+	"fmt"
 	"io"
 	"net"
 	"strings"
 	"time"

 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
+	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/urlfilter/rules"
 	"github.com/miekg/dns"
 )

+// logEntryHandler represents a handler for decoding json token to the logEntry
+// struct.
 type logEntryHandler func(t json.Token, ent *logEntry) error

+// logEntryHandlers is the map of log entry decode handlers for various keys.
 var logEntryHandlers = map[string]logEntryHandler{
 	"CID": func(t json.Token, ent *logEntry) error {
 		v, ok := t.(string)
@ -166,6 +171,7 @@ var logEntryHandlers = map[string]logEntryHandler{
 	},
 }

+// decodeResultRuleKey decodes the token of "Rules" type to logEntry struct.
 func decodeResultRuleKey(key string, i int, dec *json.Decoder, ent *logEntry) {
 	var vToken json.Token
 	switch key {
@ -189,6 +195,8 @@ func decodeResultRuleKey(key string, i int, dec *json.Decoder, ent *logEntry) {
 	}
 }

+// decodeVTokenAndAddRule decodes the "Rules" toke as [filtering.ResultRule]
+// and then adds the decoded object to the slice of result rules.
 func decodeVTokenAndAddRule(
 	key string,
 	i int,
@ -213,6 +221,8 @@ func decodeVTokenAndAddRule(
 	return newRules, vToken
 }

+// decodeResultRules parses the dec's tokens into logEntry ent interpreting it
+// as a slice of the result rules.
 func decodeResultRules(dec *json.Decoder, ent *logEntry) {
 	for {
 		delimToken, err := dec.Token()
@ -224,24 +234,32 @@ func decodeResultRules(dec *json.Decoder, ent *logEntry) {
 			return
 		}

-		if d, ok := delimToken.(json.Delim); ok {
-			if d != '[' {
+		if d, ok := delimToken.(json.Delim); !ok {
+			return
+		} else if d != '[' {
 			log.Debug("decodeResultRules: unexpected delim %q", d)
 		}
-		} else {
-			return
+
+		err = decodeResultRuleToken(dec, ent)
+		if err != nil {
+			if err != io.EOF && !errors.Is(err, ErrEndOfToken) {
+				log.Debug("decodeResultRules err: %s", err)
 			}

+			return
+		}
+	}
+}
+
+// decodeResultRuleToken decodes the tokens of "Rules" type to the logEntry ent.
+func decodeResultRuleToken(dec *json.Decoder, ent *logEntry) (err error) {
 	i := 0
 	for {
 		var keyToken json.Token
 		keyToken, err = dec.Token()
 		if err != nil {
-				if err != io.EOF {
-					log.Debug("decodeResultRules err: %s", err)
-				}
-
-				return
+			// Don't wrap the error, because it's informative enough as is.
+			return err
 		}

 		if d, ok := keyToken.(json.Delim); ok {
@ -249,7 +267,7 @@ func decodeResultRules(dec *json.Decoder, ent *logEntry) {
 			case '}':
 				i++
 			case ']':
-					return
+				return ErrEndOfToken
 			default:
 				// Go on.
 			}
@ -259,15 +277,12 @@ func decodeResultRules(dec *json.Decoder, ent *logEntry) {

 		key, ok := keyToken.(string)
 		if !ok {
-				log.Debug("decodeResultRules: keyToken is %T (%[1]v) and not string", keyToken)
-
-				return
+			return fmt.Errorf("keyToken is %T (%[1]v) and not string", keyToken)
 		}

 		decodeResultRuleKey(key, i, dec, ent)
 	}
 }
-}

 // decodeResultReverseHosts parses the dec's tokens into ent interpreting it as
 // the result of hosts container's $dnsrewrite rule.  It assumes there are no
@ -322,6 +337,8 @@ func decodeResultReverseHosts(dec *json.Decoder, ent *logEntry) {
 	}
 }

+// decodeResultIPList parses the dec's tokens into logEntry ent interpreting it
+// as the result IP addresses list.
 func decodeResultIPList(dec *json.Decoder, ent *logEntry) {
 	for {
 		itemToken, err := dec.Token()
@ -355,6 +372,8 @@ func decodeResultIPList(dec *json.Decoder, ent *logEntry) {
 	}
 }

+// decodeResultDNSRewriteResultKey decodes the token of "DNSRewriteResult" type
+// to the logEntry struct.
 func decodeResultDNSRewriteResultKey(key string, dec *json.Decoder, ent *logEntry) {
 	var err error

@ -395,50 +414,29 @@ func decodeResultDNSRewriteResultKey(key string, dec *json.Decoder, ent *logEntr
 			log.Debug("decodeResultDNSRewriteResultKey response err: %s", err)
 		}

-		for rrType, rrValues := range ent.Result.DNSRewriteResult.Response {
-			switch rrType {
-			case
-				dns.TypeA,
-				dns.TypeAAAA:
-				for i, v := range rrValues {
-					s, _ := v.(string)
-					rrValues[i] = net.ParseIP(s)
-				}
-			default:
-				// Go on.
-			}
-		}
+		ent.parseDNSRewriteResultIPs()
 	default:
 		// Go on.
 	}
 }

+// decodeResultDNSRewriteResult parses the dec's tokens into logEntry ent
+// interpreting it as the result DNSRewriteResult.
 func decodeResultDNSRewriteResult(dec *json.Decoder, ent *logEntry) {
 	for {
-		keyToken, err := dec.Token()
+		key, err := parseKeyToken(dec)
 		if err != nil {
-			if err != io.EOF {
-				log.Debug("decodeResultDNSRewriteResult err: %s", err)
+			if err != io.EOF && !errors.Is(err, ErrEndOfToken) {
+				log.Debug("decodeResultDNSRewriteResult: %s", err)
 			}

 			return
 		}

-		if d, ok := keyToken.(json.Delim); ok {
-			if d == '}' {
-				return
-			}
-
+		if key == "" {
 			continue
 		}

-		key, ok := keyToken.(string)
-		if !ok {
-			log.Debug("decodeResultDNSRewriteResult: keyToken is %T (%[1]v) and not string", keyToken)
-
-			return
-		}
-
 		decodeResultDNSRewriteResultKey(key, dec, ent)
 	}
 }
@ -474,34 +472,51 @@ func translateResult(ent *logEntry) {
 	res.IPList = nil
 }

-func decodeResult(dec *json.Decoder, ent *logEntry) {
-	defer translateResult(ent)
+// ErrEndOfToken is an error returned by parse key token when the closing
+// bracket is found.
+const ErrEndOfToken errors.Error = "end of token"

-	for {
+// parseKeyToken parses the dec's token key.
+func parseKeyToken(dec *json.Decoder) (key string, err error) {
 	keyToken, err := dec.Token()
 	if err != nil {
-			if err != io.EOF {
-				log.Debug("decodeResult err: %s", err)
-			}
-
-			return
+		return "", err
 	}

 	if d, ok := keyToken.(json.Delim); ok {
 		if d == '}' {
-				return
+			return "", ErrEndOfToken
 		}

-			continue
+		return "", nil
 	}

 	key, ok := keyToken.(string)
 	if !ok {
-			log.Debug("decodeResult: keyToken is %T (%[1]v) and not string", keyToken)
+		return "", fmt.Errorf("keyToken is %T (%[1]v) and not string", keyToken)
+	}
+
+	return key, nil
+}
+
+// decodeResult decodes a token of "Result" type to logEntry struct.
+func decodeResult(dec *json.Decoder, ent *logEntry) {
+	defer translateResult(ent)
+
+	for {
+		key, err := parseKeyToken(dec)
+		if err != nil {
+			if err != io.EOF && !errors.Is(err, ErrEndOfToken) {
+				log.Debug("decodeResult: %s", err)
+			}

 			return
 		}

+		if key == "" {
+			continue
+		}
+
 		decHandler, ok := resultDecHandlers[key]
 		if ok {
 			decHandler(dec, ent)
@ -527,13 +542,16 @@ func decodeResult(dec *json.Decoder, ent *logEntry) {
 	}
 }

+// resultHandlers is the map of log entry decode handlers for various keys.
 var resultHandlers = map[string]logEntryHandler{
 	"IsFiltered": func(t json.Token, ent *logEntry) error {
 		v, ok := t.(bool)
 		if !ok {
 			return nil
 		}
+
 		ent.Result.IsFiltered = v
+
 		return nil
 	},
 	"Rule": func(t json.Token, ent *logEntry) error {
@ -578,11 +596,14 @@ var resultHandlers = map[string]logEntryHandler{
 		if !ok {
 			return nil
 		}
+
 		i, err := v.Int64()
 		if err != nil {
 			return err
 		}
+
 		ent.Result.Reason = filtering.Reason(i)
+
 		return nil
 	},
 	"ServiceName": func(t json.Token, ent *logEntry) error {
@ -607,6 +628,7 @@ var resultHandlers = map[string]logEntryHandler{
 	},
 }

+// resultDecHandlers is the map of decode handlers for various keys.
 var resultDecHandlers = map[string]func(dec *json.Decoder, ent *logEntry){
 	"ReverseHosts":     decodeResultReverseHosts,
 	"IPList":           decodeResultIPList,
@ -614,9 +636,11 @@ var resultDecHandlers = map[string]func(dec *json.Decoder, ent *logEntry){
 	"DNSRewriteResult": decodeResultDNSRewriteResult,
 }

+// decodeLogEntry decodes string str to logEntry ent.
 func decodeLogEntry(ent *logEntry, str string) {
 	dec := json.NewDecoder(strings.NewReader(str))
 	dec.UseNumber()
+
 	for {
 		keyToken, err := dec.Token()
 		if err != nil {
--- a/internal/querylog/decode_test.go
+++ b/internal/querylog/decode_test.go
@ -182,8 +182,7 @@ func TestDecodeLogEntry(t *testing.T) {
 			if tc.want == "" {
 				assert.Empty(t, s)
 			} else {
-				assert.True(t, strings.HasSuffix(s, tc.want),
-					"got %q", s)
+				assert.True(t, strings.HasSuffix(s, tc.want), "got %q", s)
 			}

 			logOutput.Reset()
--- a/internal/querylog/entry.go
+++ b/internal/querylog/entry.go
@ -68,3 +68,19 @@ func (e *logEntry) addResponse(resp *dns.Msg, isOrig bool) {
 		log.Error("querylog: %s", err)
 	}
 }
+
+// parseDNSRewriteResultIPs fills logEntry's DNSRewriteResult response records
+// with the IP addresses parsed from the raw strings.
+func (e *logEntry) parseDNSRewriteResultIPs() {
+	for rrType, rrValues := range e.Result.DNSRewriteResult.Response {
+		switch rrType {
+		case dns.TypeA, dns.TypeAAAA:
+			for i, v := range rrValues {
+				s, _ := v.(string)
+				rrValues[i] = net.ParseIP(s)
+			}
+		default:
+			// Go on.
+		}
+	}
+}
--- a/internal/querylog/qlog.go
+++ b/internal/querylog/qlog.go
@ -16,32 +16,35 @@ import (
 	"github.com/miekg/dns"
 )

-const (
-	queryLogFileName = "querylog.json" // .gz added during compression
-)
+// queryLogFileName is a name of the log file.  ".gz" extension is added later
+// during compression.
+const queryLogFileName = "querylog.json"

-// queryLog is a structure that writes and reads the DNS query log
+// queryLog is a structure that writes and reads the DNS query log.
 type queryLog struct {
-	findClient func(ids []string) (c *Client, err error)
-
 	// confMu protects conf.
 	confMu *sync.RWMutex
+
 	conf       *Config
+	anonymizer *aghnet.IPMut
+
+	findClient func(ids []string) (c *Client, err error)

 	// logFile is the path to the log file.
 	logFile string

-	// bufferLock protects buffer.
-	bufferLock sync.RWMutex
 	// buffer contains recent log entries.  The entries in this buffer must not
 	// be modified.
 	buffer []*logEntry

-	fileFlushLock sync.Mutex // synchronize a file-flushing goroutine and main thread
-	flushPending  bool       // don't start another goroutine while the previous one is still running
+	// bufferLock protects buffer.
+	bufferLock sync.RWMutex
+
+	// fileFlushLock synchronizes a file-flushing goroutine and main thread.
+	fileFlushLock sync.Mutex
 	fileWriteLock sync.Mutex

-	anonymizer *aghnet.IPMut
+	flushPending bool
 }

 // ClientProto values are names of the client protocols.
@ -155,6 +158,43 @@ func (l *queryLog) clear() {
 	log.Debug("querylog: cleared")
 }

+// newLogEntry creates an instance of logEntry from parameters.
+func newLogEntry(params *AddParams) (entry *logEntry) {
+	q := params.Question.Question[0]
+
+	entry = &logEntry{
+		// TODO(d.kolyshev): Export this timestamp to func params.
+		Time: time.Now(),
+
+		QHost:  strings.ToLower(q.Name[:len(q.Name)-1]),
+		QType:  dns.Type(q.Qtype).String(),
+		QClass: dns.Class(q.Qclass).String(),
+
+		ClientID:    params.ClientID,
+		ClientProto: params.ClientProto,
+
+		Result:   *params.Result,
+		Upstream: params.Upstream,
+
+		IP: params.ClientIP,
+
+		Elapsed: params.Elapsed,
+
+		Cached:            params.Cached,
+		AuthenticatedData: params.AuthenticatedData,
+	}
+
+	if params.ReqECS != nil {
+		entry.ReqECS = params.ReqECS.String()
+	}
+
+	entry.addResponse(params.Answer, false)
+	entry.addResponse(params.OrigAnswer, true)
+
+	return entry
+}
+
+// Add implements the [QueryLog] interface for *queryLog.
 func (l *queryLog) Add(params *AddParams) {
 	var isEnabled, fileIsEnabled bool
 	var memSize uint32
@ -181,35 +221,7 @@ func (l *queryLog) Add(params *AddParams) {
 		params.Result = &filtering.Result{}
 	}

-	now := time.Now()
-	q := params.Question.Question[0]
-	entry := &logEntry{
-		Time: now,
-
-		QHost:  strings.ToLower(q.Name[:len(q.Name)-1]),
-		QType:  dns.Type(q.Qtype).String(),
-		QClass: dns.Class(q.Qclass).String(),
-
-		ClientID:    params.ClientID,
-		ClientProto: params.ClientProto,
-
-		Result:   *params.Result,
-		Upstream: params.Upstream,
-
-		IP: params.ClientIP,
-
-		Elapsed: params.Elapsed,
-
-		Cached:            params.Cached,
-		AuthenticatedData: params.AuthenticatedData,
-	}
-
-	if params.ReqECS != nil {
-		entry.ReqECS = params.ReqECS.String()
-	}
-
-	entry.addResponse(params.Answer, false)
-	entry.addResponse(params.OrigAnswer, true)
+	entry := newLogEntry(params)

 	needFlush := false
 	func() {
--- a/internal/querylog/qlog_test.go
+++ b/internal/querylog/qlog_test.go
@ -6,7 +6,6 @@ import (
 	"testing"

 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
-	"github.com/AdguardTeam/dnsproxy/proxyutil"
 	"github.com/AdguardTeam/golibs/stringutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/AdguardTeam/golibs/timeutil"
@ -46,9 +45,10 @@ func TestQueryLog(t *testing.T) {
 	addEntry(l, "example.com", net.IPv4(1, 1, 1, 4), net.IPv4(2, 2, 2, 4))

 	type tcAssertion struct {
-		num            int
 		host   string
-		answer, client net.IP
+		answer net.IP
+		client net.IP
+		num    int
 	}

 	testCases := []struct {
@ -367,6 +367,6 @@ func assertLogEntry(t *testing.T, entry *logEntry, host string, answer, client n
 	require.NoError(t, msg.Unpack(entry.Answer))
 	require.Len(t, msg.Answer, 1)

-	ip := proxyutil.IPFromRR(msg.Answer[0]).To16()
-	assert.Equal(t, answer, ip)
+	a := testutil.RequireTypeAssert[*dns.A](t, msg.Answer[0])
+	assert.Equal(t, answer, a.A.To16())
 }
--- a/internal/querylog/qlogfile.go
+++ b/internal/querylog/qlogfile.go
@ -12,141 +12,181 @@ import (
 	"github.com/AdguardTeam/golibs/log"
 )

-// Timestamp not found errors.
 const (
-	ErrTSNotFound errors.Error = "ts not found"
-	ErrTSTooLate  errors.Error = "ts too late"
-	ErrTSTooEarly errors.Error = "ts too early"
+	// Timestamp not found errors.
+	errTSNotFound errors.Error = "ts not found"
+	errTSTooLate  errors.Error = "ts too late"
+	errTSTooEarly errors.Error = "ts too early"
+
+	// maxEntrySize is a maximum size of the entry.
+	//
+	// TODO: Find a way to grow buffer instead of relying on this value when
+	// reading strings.
+	maxEntrySize = 16 * 1024
+
+	// bufferSize should be enough for at least this number of entries.
+	bufferSize = 100 * maxEntrySize
 )

-// TODO: Find a way to grow buffer instead of relying on this value when reading strings
-const maxEntrySize = 16 * 1024
-
-// buffer should be enough for at least this number of entries
-const bufferSize = 100 * maxEntrySize
-
-// QLogFile represents a single query log file
-// It allows reading from the file in the reverse order
+// qLogFile represents a single query log file.  It allows reading from the
+// file in the reverse order.
 //
-// Please note that this is a stateful object.
-// Internally, it contains a pointer to a specific position in the file,
-// and it reads lines in reverse order starting from that position.
-type QLogFile struct {
-	file     *os.File // the query log file
-	position int64    // current position in the file
+// Please note, that this is a stateful object.  Internally, it contains a
+// pointer to a specific position in the file, and it reads lines in reverse
+// order starting from that position.
+type qLogFile struct {
+	// file is the query log file.
+	file *os.File

-	buffer      []byte // buffer that we've read from the file
-	bufferStart int64  // start of the buffer (in the file)
-	bufferLen   int    // buffer len
+	// buffer that we've read from the file.
+	buffer []byte

-	lock sync.Mutex // We use mutex to make it thread-safe
+	// lock is a mutex to make it thread-safe.
+	lock sync.Mutex
+
+	// position is the position in the file.
+	position int64
+
+	// bufferStart is the start of the buffer (in the file).
+	bufferStart int64
+
+	// bufferLen is the length of the buffer.
+	bufferLen int
 }

-// NewQLogFile initializes a new instance of the QLogFile
-func NewQLogFile(path string) (*QLogFile, error) {
+// newQLogFile initializes a new instance of the qLogFile.
+func newQLogFile(path string) (qf *qLogFile, err error) {
 	f, err := os.OpenFile(path, os.O_RDONLY, 0o644)
 	if err != nil {
 		return nil, err
 	}

-	return &QLogFile{
-		file: f,
-	}, nil
+	return &qLogFile{file: f}, nil
+}
+
+// validateQLogLineIdx returns error if the line index is not valid to continue
+// search.
+func (q *qLogFile) validateQLogLineIdx(lineIdx, lastProbeLineIdx, ts, fSize int64) (err error) {
+	if lineIdx == lastProbeLineIdx {
+		if lineIdx == 0 {
+			return errTSTooEarly
+		}
+
+		// If we're testing the same line twice then most likely the scope is
+		// too narrow and we won't find anything anymore in any other file.
+		return fmt.Errorf("looking up timestamp %d in %q: %w", ts, q.file.Name(), errTSNotFound)
+	} else if lineIdx == fSize {
+		return errTSTooLate
+	}
+
+	return nil
 }

 // seekTS performs binary search in the query log file looking for a record
-// with the specified timestamp. Once the record is found, it sets
-// "position" so that the next ReadNext call returned that record.
+// with the specified timestamp.  Once the record is found, it sets "position"
+// so that the next ReadNext call returned that record.
 //
 // The algorithm is rather simple:
-// 1. It starts with the position in the middle of a file
-// 2. Shifts back to the beginning of the line
-// 3. Checks the log record timestamp
-// 4. If it is lower than the timestamp we are looking for,
-// it shifts seek position to 3/4 of the file. Otherwise, to 1/4 of the file.
-// 5. It performs the search again, every time the search scope is narrowed twice.
+//  1. It starts with the position in the middle of a file.
+//  2. Shifts back to the beginning of the line.
+//  3. Checks the log record timestamp.
+//  4. If it is lower than the timestamp we are looking for, it shifts seek
+//     position to 3/4 of the file. Otherwise, to 1/4 of the file.
+//  5. It performs the search again, every time the search scope is narrowed
+//     twice.
 //
 // Returns:
-// * It returns the position of the the line with the timestamp we were looking for
-// so that when we call "ReadNext" this line was returned.
-// * Depth of the search (how many times we compared timestamps).
-// * If we could not find it, it returns one of the errors described above.
-func (q *QLogFile) seekTS(timestamp int64) (int64, int, error) {
+//   - It returns the position of the line with the timestamp we were looking
+//     for so that when we call "ReadNext" this line was returned.
+//   - Depth of the search (how many times we compared timestamps).
+//   - If we could not find it, it returns one of the errors described above.
+func (q *qLogFile) seekTS(timestamp int64) (pos int64, depth int, err error) {
 	q.lock.Lock()
 	defer q.lock.Unlock()

-	// Empty the buffer
+	// Empty the buffer.
 	q.buffer = nil

-	// First of all, check the file size
+	// First of all, check the file size.
 	fileInfo, err := q.file.Stat()
 	if err != nil {
 		return 0, 0, err
 	}

-	// Define the search scope
-	start := int64(0)          // start of the search interval (position in the file)
-	end := fileInfo.Size()     // end of the search interval (position in the file)
-	probe := (end - start) / 2 // probe -- approximate index of the line we'll try to check
+	// Define the search scope.
+
+	// Start of the search interval (position in the file).
+	start := int64(0)
+	// End of the search interval (position in the file).
+	end := fileInfo.Size()
+	// Probe is the approximate index of the line we'll try to check.
+	probe := (end - start) / 2
+
 	var line string
-	var lineIdx int64 // index of the probe line in the file
+	// Index of the probe line in the file.
+	var lineIdx int64
 	var lineEndIdx int64
-	var lastProbeLineIdx int64 // index of the last probe line
+	// Index of the last probe line.
+	var lastProbeLineIdx int64
 	lastProbeLineIdx = -1

-	// Count seek depth in order to detect mistakes
-	// If depth is too large, we should stop the search
-	depth := 0
-
+	// Count seek depth in order to detect mistakes.  If depth is too large,
+	// we should stop the search.
 	for {
-		// Get the line at the specified position
+		// Get the line at the specified position.
 		line, lineIdx, lineEndIdx, err = q.readProbeLine(probe)
 		if err != nil {
 			return 0, depth, err
 		}

-		if lineIdx == lastProbeLineIdx {
-			if lineIdx == 0 {
-				return 0, depth, ErrTSTooEarly
+		// Check if the line index if invalid.
+		err = q.validateQLogLineIdx(lineIdx, lastProbeLineIdx, timestamp, fileInfo.Size())
+		if err != nil {
+			return 0, depth, err
 		}

-			// If we're testing the same line twice then most likely
-			// the scope is too narrow and we won't find anything
-			// anymore in any other file.
-			return 0, depth, fmt.Errorf("looking up timestamp %d in %q: %w", timestamp, q.file.Name(), ErrTSNotFound)
-		} else if lineIdx == fileInfo.Size() {
-			return 0, depth, ErrTSTooLate
-		}
-
-		// Save the last found idx
+		// Save the last found idx.
 		lastProbeLineIdx = lineIdx

-		// Get the timestamp from the query log record
+		// Get the timestamp from the query log record.
 		ts := readQLogTimestamp(line)
 		if ts == 0 {
-			return 0, depth, fmt.Errorf("looking up timestamp %d in %q: record %q has empty timestamp", timestamp, q.file.Name(), line)
+			return 0, depth, fmt.Errorf(
+				"looking up timestamp %d in %q: record %q has empty timestamp",
+				timestamp,
+				q.file.Name(),
+				line,
+			)
 		}

 		if ts == timestamp {
-			// Hurray, returning the result
+			// Hurray, returning the result.
 			break
 		}

-		// Narrow the scope and repeat the search
+		// Narrow the scope and repeat the search.
 		if ts > timestamp {
-			// If the timestamp we're looking for is OLDER than what we found
-			// Then the line is somewhere on the LEFT side from the current probe position
+			// If the timestamp we're looking for is OLDER than what we found,
+			// then the line is somewhere on the LEFT side from the current
+			// probe position.
 			end = lineIdx
 		} else {
-			// If the timestamp we're looking for is NEWER than what we found
-			// Then the line is somewhere on the RIGHT side from the current probe position
+			// If the timestamp we're looking for is NEWER than what we found,
+			// then the line is somewhere on the RIGHT side from the current
+			// probe position.
 			start = lineEndIdx
 		}
 		probe = start + (end-start)/2

 		depth++
 		if depth >= 100 {
-			return 0, depth, fmt.Errorf("looking up timestamp %d in %q: depth %d too high: %w", timestamp, q.file.Name(), depth, ErrTSNotFound)
+			return 0, depth, fmt.Errorf(
+				"looking up timestamp %d in %q: depth %d too high: %w",
+				timestamp,
+				q.file.Name(),
+				depth,
+				errTSNotFound,
+			)
 		}
 	}

@ -154,37 +194,39 @@ func (q *QLogFile) seekTS(timestamp int64) (int64, int, error) {
 	return q.position, depth, nil
 }

-// SeekStart changes the current position to the end of the file
-// Please note that we're reading query log in the reverse order
-// and that's why log start is actually the end of file
+// SeekStart changes the current position to the end of the file.  Please note,
+// that we're reading query log in the reverse order and that's why log start
+// is actually the end of file.
 //
-// Returns nil if we were able to change the current position.
-// Returns error in any other case.
-func (q *QLogFile) SeekStart() (int64, error) {
+// Returns nil if we were able to change the current position.  Returns error
+// in any other case.
+func (q *qLogFile) SeekStart() (int64, error) {
 	q.lock.Lock()
 	defer q.lock.Unlock()

-	// Empty the buffer
+	// Empty the buffer.
 	q.buffer = nil

-	// First of all, check the file size
+	// First of all, check the file size.
 	fileInfo, err := q.file.Stat()
 	if err != nil {
 		return 0, err
 	}

-	// Place the position to the very end of file
+	// Place the position to the very end of file.
 	q.position = fileInfo.Size() - 1
 	if q.position < 0 {
 		q.position = 0
 	}
+
 	return q.position, nil
 }

-// ReadNext reads the next line (in the reverse order) from the file
-// and shifts the current position left to the next (actually prev) line.
-// returns io.EOF if there's nothing to read more
-func (q *QLogFile) ReadNext() (string, error) {
+// ReadNext reads the next line (in the reverse order) from the file and shifts
+// the current position left to the next (actually prev) line.
+//
+// Returns io.EOF if there's nothing more to read.
+func (q *qLogFile) ReadNext() (string, error) {
 	q.lock.Lock()
 	defer q.lock.Unlock()

@ -197,35 +239,34 @@ func (q *QLogFile) ReadNext() (string, error) {
 		return "", err
 	}

-	// Shift position
+	// Shift position.
 	if lineIdx == 0 {
 		q.position = 0
 	} else {
-		// there's usually a line break before the line
-		// so we should shift one more char left from the line
-		// line\nline
+		// There's usually a line break before the line, so we should shift one
+		// more char left from the line "\nline".
 		q.position = lineIdx - 1
 	}
 	return line, err
 }

-// Close frees the underlying resources
-func (q *QLogFile) Close() error {
+// Close frees the underlying resources.
+func (q *qLogFile) Close() error {
 	return q.file.Close()
 }

-// readNextLine reads the next line from the specified position
-// this line actually have to END on that position.
+// readNextLine reads the next line from the specified position.  This line
+// actually have to END on that position.
 //
-// the algorithm is:
-// 1. check if we have the buffer initialized
-// 2. if it is, scan it and look for the line there
-// 3. if we cannot find the line there, read the prev chunk into the buffer
-// 4. read the line from the buffer
-func (q *QLogFile) readNextLine(position int64) (string, int64, error) {
+// The algorithm is:
+//  1. Check if we have the buffer initialized.
+//  2. If it is so, scan it and look for the line there.
+//  3. If we cannot find the line there, read the prev chunk into the buffer.
+//  4. Read the line from the buffer.
+func (q *qLogFile) readNextLine(position int64) (string, int64, error) {
 	relativePos := position - q.bufferStart
 	if q.buffer == nil || (relativePos < maxEntrySize && q.bufferStart != 0) {
-		// Time to re-init the buffer
+		// Time to re-init the buffer.
 		err := q.initBuffer(position)
 		if err != nil {
 			return "", 0, err
@ -233,8 +274,7 @@ func (q *QLogFile) readNextLine(position int64) (string, int64, error) {
 		relativePos = position - q.bufferStart
 	}

-	// Look for the end of the prev line
-	// This is where we'll read from
+	// Look for the end of the prev line, this is where we'll read from.
 	startLine := int64(0)
 	for i := relativePos - 1; i >= 0; i-- {
 		if q.buffer[i] == '\n' {
@ -245,18 +285,19 @@ func (q *QLogFile) readNextLine(position int64) (string, int64, error) {

 	line := string(q.buffer[startLine:relativePos])
 	lineIdx := q.bufferStart + startLine
+
 	return line, lineIdx, nil
 }

-// initBuffer initializes the QLogFile buffer.
-// the goal is to read a chunk of file that includes the line with the specified position.
-func (q *QLogFile) initBuffer(position int64) error {
+// initBuffer initializes the qLogFile buffer.  The goal is to read a chunk of
+// file that includes the line with the specified position.
+func (q *qLogFile) initBuffer(position int64) error {
 	q.bufferStart = int64(0)
 	if position > bufferSize {
 		q.bufferStart = position - bufferSize
 	}

-	// Seek to this position
+	// Seek to this position.
 	_, err := q.file.Seek(q.bufferStart, io.SeekStart)
 	if err != nil {
 		return err
@ -271,34 +312,35 @@ func (q *QLogFile) initBuffer(position int64) error {
 	return err
 }

-// readProbeLine reads a line that includes the specified position
-// this method is supposed to be used when we use binary search in the Seek method
-// in the case of consecutive reads, use readNext (it uses a better buffer)
-func (q *QLogFile) readProbeLine(position int64) (string, int64, int64, error) {
-	// First of all, we should read a buffer that will include the query log line
-	// In order to do this, we'll define the boundaries
+// readProbeLine reads a line that includes the specified position.  This
+// method is supposed to be used when we use binary search in the Seek method.
+// In the case of consecutive reads, use readNext, cause it uses better buffer.
+func (q *qLogFile) readProbeLine(position int64) (string, int64, int64, error) {
+	// First of all, we should read a buffer that will include the query log
+	// line.  In order to do this, we'll define the boundaries.
 	seekPosition := int64(0)
-	relativePos := position // position relative to the buffer we're going to read
+	// Position relative to the buffer we're going to read.
+	relativePos := position
 	if position > maxEntrySize {
 		seekPosition = position - maxEntrySize
 		relativePos = maxEntrySize
 	}

-	// Seek to this position
+	// Seek to this position.
 	_, err := q.file.Seek(seekPosition, io.SeekStart)
 	if err != nil {
 		return "", 0, 0, err
 	}

-	// The buffer size is 2*maxEntrySize
+	// The buffer size is 2*maxEntrySize.
 	buffer := make([]byte, maxEntrySize*2)
 	bufferLen, err := q.file.Read(buffer)
 	if err != nil {
 		return "", 0, 0, err
 	}

-	// Now start looking for the new line character starting
-	// from the relativePos and going left
+	// Now start looking for the new line character starting from the
+	// relativePos and going left.
 	startLine := int64(0)
 	for i := relativePos - 1; i >= 0; i-- {
 		if buffer[i] == '\n' {
@ -306,7 +348,7 @@ func (q *QLogFile) readProbeLine(position int64) (string, int64, int64, error) {
 			break
 		}
 	}
-	// Looking for the end of line now
+	// Looking for the end of line now.
 	endLine := int64(bufferLen)
 	lineEndIdx := endLine + seekPosition
 	for i := relativePos; i < int64(bufferLen); i++ {
@ -317,13 +359,13 @@ func (q *QLogFile) readProbeLine(position int64) (string, int64, int64, error) {
 		}
 	}

-	// Finally we can return the string we were looking for
+	// Finally we can return the string we were looking for.
 	lineIdx := startLine + seekPosition
 	return string(buffer[startLine:endLine]), lineIdx, lineEndIdx, nil
 }

-// readJSONvalue reads a JSON string in form of '"key":"value"'.  prefix must be
-// of the form '"key":"' to generate less garbage.
+// readJSONValue reads a JSON string in form of '"key":"value"'.  prefix must
+// be of the form '"key":"' to generate less garbage.
 func readJSONValue(s, prefix string) string {
 	i := strings.Index(s, prefix)
 	if i == -1 {
@ -340,7 +382,7 @@ func readJSONValue(s, prefix string) string {
 	return s[start:end]
 }

-// readQLogTimestamp reads the timestamp field from the query log line
+// readQLogTimestamp reads the timestamp field from the query log line.
 func readQLogTimestamp(str string) int64 {
 	val := readJSONValue(str, `"T":"`)
 	if len(val) == 0 {
@ -351,10 +393,12 @@ func readQLogTimestamp(str string) int64 {
 		log.Error("Couldn't find timestamp: %s", str)
 		return 0
 	}
+
 	tm, err := time.Parse(time.RFC3339Nano, val)
 	if err != nil {
 		log.Error("Couldn't parse timestamp: %s", val)
 		return 0
 	}
+
 	return tm.UnixNano()
 }
--- a/internal/querylog/qlogfile_test.go
+++ b/internal/querylog/qlogfile_test.go
@ -72,15 +72,15 @@ func prepareTestFiles(t *testing.T, filesNum, linesNum int) []string {
 	return files
 }

-// newTestQLogFile creates new *QLogFile for tests and registers the required
+// newTestQLogFile creates new *qLogFile for tests and registers the required
 // cleanup functions.
-func newTestQLogFile(t *testing.T, linesNum int) (file *QLogFile) {
+func newTestQLogFile(t *testing.T, linesNum int) (file *qLogFile) {
 	t.Helper()

 	testFile := prepareTestFiles(t, 1, linesNum)[0]

-	// Create the new QLogFile instance.
-	file, err := NewQLogFile(testFile)
+	// Create the new qLogFile instance.
+	file, err := newQLogFile(testFile)
 	require.NoError(t, err)

 	assert.NotNil(t, file)
@ -240,7 +240,7 @@ func TestQLogFile_SeekTS_bad(t *testing.T) {
 	}
 }

-func getQLogFileLine(q *QLogFile, lineNumber int) (line string, err error) {
+func getQLogFileLine(q *qLogFile, lineNumber int) (line string, err error) {
 	if _, err = q.SeekStart(); err != nil {
 		return line, err
 	}
@ -256,7 +256,7 @@ func getQLogFileLine(q *QLogFile, lineNumber int) (line string, err error) {

 // Check adding and loading (with filtering) entries from disk and memory.
 func TestQLogFile(t *testing.T) {
-	// Create the new QLogFile instance.
+	// Create the new qLogFile instance.
 	q := newTestQLogFile(t, 2)

 	// Seek to the start.
@ -285,7 +285,7 @@ func TestQLogFile(t *testing.T) {
 	assert.Empty(t, line)
 }

-func NewTestQLogFileData(t *testing.T, data string) (file *QLogFile) {
+func newTestQLogFileData(t *testing.T, data string) (file *qLogFile) {
 	f, err := os.CreateTemp(t.TempDir(), "*.txt")
 	require.NoError(t, err)
 	testutil.CleanupAndRequireSuccess(t, f.Close)
@ -293,7 +293,7 @@ func NewTestQLogFileData(t *testing.T, data string) (file *QLogFile) {
 	_, err = f.WriteString(data)
 	require.NoError(t, err)

-	file, err = NewQLogFile(f.Name())
+	file, err = newQLogFile(f.Name())
 	require.NoError(t, err)
 	testutil.CleanupAndRequireSuccess(t, file.Close)

@ -309,9 +309,9 @@ func TestQLog_Seek(t *testing.T) {
 	timestamp, _ := time.Parse(time.RFC3339Nano, "2020-08-31T18:44:25.376690873+03:00")

 	testCases := []struct {
+		wantErr   error
 		name      string
 		delta     int
-		wantErr   error
 		wantDepth int
 	}{{
 		name:      "ok",
@ -321,12 +321,12 @@ func TestQLog_Seek(t *testing.T) {
 	}, {
 		name:      "too_late",
 		delta:     2,
-		wantErr:   ErrTSTooLate,
+		wantErr:   errTSTooLate,
 		wantDepth: 2,
 	}, {
 		name:      "too_early",
 		delta:     -2,
-		wantErr:   ErrTSTooEarly,
+		wantErr:   errTSTooEarly,
 		wantDepth: 1,
 	}}

@ -338,7 +338,7 @@ func TestQLog_Seek(t *testing.T) {
 				timestamp.Add(time.Second).Format(time.RFC3339Nano),
 			)

-			q := NewTestQLogFileData(t, data)
+			q := newTestQLogFileData(t, data)

 			_, depth, err := q.seekTS(timestamp.Add(time.Second * time.Duration(tc.delta)).UnixNano())
 			require.Truef(t, errors.Is(err, tc.wantErr), "%v", err)
--- a/internal/querylog/qlogreader.go
+++ b/internal/querylog/qlogreader.go
@ -9,36 +9,36 @@ import (
 	"github.com/AdguardTeam/golibs/log"
 )

-// QLogReader allows reading from multiple query log files in the reverse order.
+// qLogReader allows reading from multiple query log files in the reverse
+// order.
 //
-// Please note that this is a stateful object.
-// Internally, it contains a pointer to a particular query log file, and
-// to a specific position in this file, and it reads lines in reverse order
-// starting from that position.
-type QLogReader struct {
-	// qFiles - array with the query log files
-	// The order is - from oldest to newest
-	qFiles []*QLogFile
+// Please note that this is a stateful object.  Internally, it contains a
+// pointer to a particular query log file, and to a specific position in this
+// file, and it reads lines in reverse order starting from that position.
+type qLogReader struct {
+	// qFiles is an array with the query log files.  The order is from oldest
+	// to newest.
+	qFiles []*qLogFile

-	currentFile int // Index of the current file
+	// currentFile is the index of the current file.
+	currentFile int
 }

-// NewQLogReader initializes a QLogReader instance
-// with the specified files
-func NewQLogReader(files []string) (*QLogReader, error) {
-	qFiles := make([]*QLogFile, 0)
+// newQLogReader initializes a qLogReader instance with the specified files.
+func newQLogReader(files []string) (*qLogReader, error) {
+	qFiles := make([]*qLogFile, 0)

 	for _, f := range files {
-		q, err := NewQLogFile(f)
+		q, err := newQLogFile(f)
 		if err != nil {
 			if errors.Is(err, os.ErrNotExist) {
 				continue
 			}

 			// Close what we've already opened.
-			cerr := closeQFiles(qFiles)
-			if cerr != nil {
-				log.Debug("querylog: closing files: %s", cerr)
+			cErr := closeQFiles(qFiles)
+			if cErr != nil {
+				log.Debug("querylog: closing files: %s", cErr)
 			}

 			return nil, err
@ -47,31 +47,28 @@ func NewQLogReader(files []string) (*QLogReader, error) {
 		qFiles = append(qFiles, q)
 	}

-	return &QLogReader{
-		qFiles:      qFiles,
-		currentFile: (len(qFiles) - 1),
-	}, nil
+	return &qLogReader{qFiles: qFiles, currentFile: len(qFiles) - 1}, nil
 }

 // seekTS performs binary search of a query log record with the specified
-// timestamp.  If the record is found, it sets QLogReader's position to point to
-// that line, so that the next ReadNext call returned this line.
-func (r *QLogReader) seekTS(timestamp int64) (err error) {
+// timestamp.  If the record is found, it sets qLogReader's position to point
+// to that line, so that the next ReadNext call returned this line.
+func (r *qLogReader) seekTS(timestamp int64) (err error) {
 	for i := len(r.qFiles) - 1; i >= 0; i-- {
 		q := r.qFiles[i]
 		_, _, err = q.seekTS(timestamp)
 		if err != nil {
-			if errors.Is(err, ErrTSTooEarly) {
+			if errors.Is(err, errTSTooEarly) {
 				// Look at the next file, since we've reached the end of this
 				// one.  If there is no next file, it's not found.
-				err = ErrTSNotFound
+				err = errTSNotFound

 				continue
-			} else if errors.Is(err, ErrTSTooLate) {
+			} else if errors.Is(err, errTSTooLate) {
 				// Just seek to the start then.  timestamp is probably between
 				// the end of the previous one and the start of this one.
 				return r.SeekStart()
-			} else if errors.Is(err, ErrTSNotFound) {
+			} else if errors.Is(err, errTSNotFound) {
 				return err
 			} else {
 				return fmt.Errorf("seekts: file at index %d: %w", i, err)
@ -80,7 +77,7 @@ func (r *QLogReader) seekTS(timestamp int64) (err error) {

 		// The search is finished, and the searched element has been found.
 		// Update currentFile only, position is already set properly in
-		// QLogFile.
+		// qLogFile.
 		r.currentFile = i

 		return nil
@ -93,13 +90,13 @@ func (r *QLogReader) seekTS(timestamp int64) (err error) {
 	return nil
 }

-// SeekStart changes the current position to the end of the newest file
-// Please note that we're reading query log in the reverse order
-// and that's why log start is actually the end of file
+// SeekStart changes the current position to the end of the newest file.
+// Please note that we're reading query log in the reverse order and that's why
+// the log starts actually at the end of file.
 //
-// Returns nil if we were able to change the current position.
-// Returns error in any other case.
-func (r *QLogReader) SeekStart() error {
+// Returns nil if we were able to change the current position.  Returns error
+// in any other cases.
+func (r *qLogReader) SeekStart() error {
 	if len(r.qFiles) == 0 {
 		return nil
 	}
@ -110,10 +107,12 @@ func (r *QLogReader) SeekStart() error {
 	return err
 }

-// ReadNext reads the next line (in the reverse order) from the query log files.
-// and shifts the current position left to the next (actually prev) line (or the next file).
-// returns io.EOF if there's nothing to read more.
-func (r *QLogReader) ReadNext() (string, error) {
+// ReadNext reads the next line (in the reverse order) from the query log
+// files.  Then shifts the current position left to the next (actually prev)
+// line (or the next file).
+//
+// Returns io.EOF if there is nothing more to read.
+func (r *qLogReader) ReadNext() (string, error) {
 	if len(r.qFiles) == 0 {
 		return "", io.EOF
 	}
@ -122,7 +121,7 @@ func (r *QLogReader) ReadNext() (string, error) {
 		q := r.qFiles[r.currentFile]
 		line, err := q.ReadNext()
 		if err != nil {
-			// Shift to the older file
+			// Shift to the older file.
 			r.currentFile--
 			if r.currentFile < 0 {
 				break
@ -130,10 +129,10 @@ func (r *QLogReader) ReadNext() (string, error) {

 			q = r.qFiles[r.currentFile]

-			// Set it's position to the start right away
+			// Set its position to the start right away.
 			_, err = q.SeekStart()

-			// This is unexpected, return an error right away
+			// This is unexpected, return an error right away.
 			if err != nil {
 				return "", err
 			}
@ -142,17 +141,17 @@ func (r *QLogReader) ReadNext() (string, error) {
 		}
 	}

-	// Nothing to read anymore
+	// Nothing to read anymore.
 	return "", io.EOF
 }

-// Close closes the QLogReader
-func (r *QLogReader) Close() error {
+// Close closes the qLogReader.
+func (r *qLogReader) Close() error {
 	return closeQFiles(r.qFiles)
 }

-// closeQFiles - helper method to close multiple QLogFile instances
-func closeQFiles(qFiles []*QLogFile) error {
+// closeQFiles is a helper method to close multiple qLogFile instances.
+func closeQFiles(qFiles []*qLogFile) error {
 	var errs []error

 	for _, q := range qFiles {
@ -163,7 +162,7 @@ func closeQFiles(qFiles []*QLogFile) error {
 	}

 	if len(errs) > 0 {
-		return errors.List("error while closing QLogReader", errs...)
+		return errors.List("error while closing qLogReader", errs...)
 	}

 	return nil
--- a/internal/querylog/qlogreader_test.go
+++ b/internal/querylog/qlogreader_test.go
@ -10,15 +10,15 @@ import (
 	"github.com/stretchr/testify/require"
 )

-// newTestQLogReader creates new *QLogReader for tests and registers the
+// newTestQLogReader creates new *qLogReader for tests and registers the
 // required cleanup functions.
-func newTestQLogReader(t *testing.T, filesNum, linesNum int) (reader *QLogReader) {
+func newTestQLogReader(t *testing.T, filesNum, linesNum int) (reader *qLogReader) {
 	t.Helper()

 	testFiles := prepareTestFiles(t, filesNum, linesNum)

-	// Create the new QLogReader instance.
-	reader, err := NewQLogReader(testFiles)
+	// Create the new qLogReader instance.
+	reader, err := newQLogReader(testFiles)
 	require.NoError(t, err)

 	assert.NotNil(t, reader)
@ -75,9 +75,9 @@ func TestQLogReader_Seek(t *testing.T) {
 	r := newTestQLogReader(t, 2, 10000)

 	testCases := []struct {
+		want error
 		name string
 		time string
-		want error
 	}{{
 		name: "not_too_old",
 		time: "2020-02-18T22:39:35.920973+03:00",
@ -97,7 +97,7 @@ func TestQLogReader_Seek(t *testing.T) {
 	}, {
 		name: "non-existent_long_ago",
 		time: "2000-02-19T01:23:16.920973+03:00",
-		want: ErrTSNotFound,
+		want: errTSNotFound,
 	}, {
 		name: "non-existent_far_ahead",
 		time: "2100-02-19T01:23:16.920973+03:00",
@ -105,7 +105,7 @@ func TestQLogReader_Seek(t *testing.T) {
 	}, {
 		name: "non-existent_but_could",
 		time: "2020-02-18T22:36:37.000000+03:00",
-		want: ErrTSNotFound,
+		want: errTSNotFound,
 	}}

 	for _, tc := range testCases {
@ -125,9 +125,9 @@ func TestQLogReader_ReadNext(t *testing.T) {
 	r := newTestQLogReader(t, filesNum, linesNum)

 	testCases := []struct {
+		want  error
 		name  string
 		start int
-		want  error
 	}{{
 		name:  "ok",
 		start: 0,
--- a/internal/querylog/search.go
+++ b/internal/querylog/search.go
@ -1,9 +1,11 @@
 package querylog

 import (
+	"fmt"
 	"io"
 	"time"

+	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 	"golang.org/x/exp/slices"
 )
@ -134,84 +136,112 @@ func (l *queryLog) search(params *searchParams) (entries []*logEntry, oldest tim
 	return entries, oldest
 }

-// searchFiles looks up log records from all log files.  It optionally uses the
-// client cache, if provided.  searchFiles does not scan more than
-// maxFileScanEntries so callers may need to call it several times to get all
-// results.  oldest and total are the time of the oldest processed entry and the
-// total number of processed entries, including discarded ones, correspondingly.
-func (l *queryLog) searchFiles(
-	params *searchParams,
-	cache clientCache,
-) (entries []*logEntry, oldest time.Time, total int) {
-	files := []string{
-		l.logFile + ".1",
-		l.logFile,
+// seekRecord changes the current position to the next record older than the
+// provided parameter.
+func (r *qLogReader) seekRecord(olderThan time.Time) (err error) {
+	if olderThan.IsZero() {
+		return r.SeekStart()
 	}

-	r, err := NewQLogReader(files)
-	if err != nil {
-		log.Error("querylog: opening qlog reader: %s", err)
-
-		return entries, oldest, 0
-	}
-
-	defer func() {
-		closeErr := r.Close()
-		if closeErr != nil {
-			log.Error("querylog: closing file: %s", err)
-		}
-	}()
-
-	if params.olderThan.IsZero() {
-		err = r.SeekStart()
-	} else {
-		err = r.seekTS(params.olderThan.UnixNano())
+	err = r.seekTS(olderThan.UnixNano())
 	if err == nil {
 		// Read to the next record, because we only need the one that goes
 		// after it.
 		_, err = r.ReadNext()
 	}
+
+	return err
 }

+// setQLogReader creates a reader with the specified files and sets the
+// position to the next record older than the provided parameter.
+func (l *queryLog) setQLogReader(olderThan time.Time) (qr *qLogReader, err error) {
+	files := []string{
+		l.logFile + ".1",
+		l.logFile,
+	}
+
+	r, err := newQLogReader(files)
 	if err != nil {
-		log.Debug("querylog: cannot seek to %s: %s", params.olderThan, err)
-
-		return entries, oldest, 0
+		return nil, fmt.Errorf("opening qlog reader: %s", err)
 	}

-	totalLimit := params.offset + params.limit
-	oldestNano := int64(0)
+	err = r.seekRecord(olderThan)
+	if err != nil {
+		defer func() { err = errors.WithDeferred(err, r.Close()) }()
+		log.Debug("querylog: cannot seek to %s: %s", olderThan, err)

-	// By default, we do not scan more than maxFileScanEntries at once.  The
-	// idea is to make search calls faster so that the UI could handle it and
-	// show something quicker.  This behavior can be overridden if
-	// maxFileScanEntries is set to 0.
+		return nil, nil
+	}
+
+	return r, nil
+}
+
+// readEntries reads entries from the reader to totalLimit.   By default, we do
+// not scan more than maxFileScanEntries at once.  The idea is to make search
+// calls faster so that the UI could handle it and show something quicker.
+// This behavior can be overridden if maxFileScanEntries is set to 0.
+func (l *queryLog) readEntries(
+	r *qLogReader,
+	params *searchParams,
+	cache clientCache,
+	totalLimit int,
+) (entries []*logEntry, oldestNano int64, total int) {
 	for total < params.maxFileScanEntries || params.maxFileScanEntries <= 0 {
-		var e *logEntry
-		var ts int64
-
-		e, ts, err = l.readNextEntry(r, params, cache)
-		if err != nil {
-			if err == io.EOF {
+		ent, ts, rErr := l.readNextEntry(r, params, cache)
+		if rErr != nil {
+			if rErr == io.EOF {
 				oldestNano = 0

 				break
 			}

-			log.Error("querylog: reading next entry: %s", err)
+			log.Error("querylog: reading next entry: %s", rErr)
 		}

 		oldestNano = ts
 		total++

-		if e != nil {
-			entries = append(entries, e)
+		if ent == nil {
+			continue
+		}
+
+		entries = append(entries, ent)
 		if len(entries) == totalLimit {
 			break
 		}
 	}
+
+	return entries, oldestNano, total
 }

+// searchFiles looks up log records from all log files.  It optionally uses the
+// client cache, if provided.  searchFiles does not scan more than
+// maxFileScanEntries so callers may need to call it several times to get all
+// the results.  oldest and total are the time of the oldest processed entry
+// and the total number of processed entries, including discarded ones,
+// correspondingly.
+func (l *queryLog) searchFiles(
+	params *searchParams,
+	cache clientCache,
+) (entries []*logEntry, oldest time.Time, total int) {
+	r, err := l.setQLogReader(params.olderThan)
+	if err != nil {
+		log.Error("querylog: %s", err)
+	}
+
+	if r == nil {
+		return entries, oldest, 0
+	}
+
+	defer func() {
+		if closeErr := r.Close(); closeErr != nil {
+			log.Error("querylog: closing file: %s", closeErr)
+		}
+	}()
+
+	totalLimit := params.offset + params.limit
+	entries, oldestNano, total := l.readEntries(r, params, cache, totalLimit)
 	if oldestNano != 0 {
 		oldest = time.Unix(0, oldestNano)
 	}
@ -243,11 +273,11 @@ func (f quickMatchClientFinder) findClient(clientID, ip string) (c *Client) {
 }

 // readNextEntry reads the next log entry and checks if it matches the search
-// criteria.  It optionally uses the client cache, if provided.  e is nil if the
-// entry doesn't match the search criteria.  ts is the timestamp of the
+// criteria.  It optionally uses the client cache, if provided.  e is nil if
+// the entry doesn't match the search criteria.  ts is the timestamp of the
 // processed entry.
 func (l *queryLog) readNextEntry(
-	r *QLogReader,
+	r *qLogReader,
 	params *searchParams,
 	cache clientCache,
 ) (e *logEntry, ts int64, err error) {
--- a/internal/querylog/searchparams.go
+++ b/internal/querylog/searchparams.go
@ -2,18 +2,25 @@ package querylog

 import "time"

-// searchParams represent the search query sent by the client
+// searchParams represent the search query sent by the client.
 type searchParams struct {
-	// searchCriteria - list of search criteria that we use to get filter results
-	searchCriteria []searchCriterion
-
-	// olderThen - return entries that are older than this value
-	// if not set - disregard it and return any value
+	// olderThen represents a parameter for entries that are older than this
+	// parameter value.  If not set, disregard it and return any value.
 	olderThan time.Time

-	offset             int // offset for the search
-	limit              int // limit the number of records returned
-	maxFileScanEntries int // maximum log entries to scan in query log files. if 0 - no limit
+	// searchCriteria is a list of search criteria that we use to get filter
+	// results.
+	searchCriteria []searchCriterion
+
+	// offset for the search.
+	offset int
+
+	// limit the number of records returned.
+	limit int
+
+	// maxFileScanEntries is a maximum of log entries to scan in query log
+	// files.  If not set, then no limit.
+	maxFileScanEntries int
 }

 // newSearchParams - creates an empty instance of searchParams
--- a/internal/tools/go.mod
+++ b/internal/tools/go.mod
@ -8,16 +8,16 @@ require (
 	github.com/gordonklaus/ineffassign v0.0.0-20230107090616-13ace0543b28
 	github.com/kisielk/errcheck v1.6.3
 	github.com/kyoh86/looppointer v0.2.1
-	github.com/securego/gosec/v2 v2.15.0
-	golang.org/x/tools v0.8.0
-	golang.org/x/vuln v0.0.0-20230418010118-28ba02ac73db
+	github.com/securego/gosec/v2 v2.16.0
+	golang.org/x/tools v0.9.3
+	golang.org/x/vuln v0.1.0
 	honnef.co/go/tools v0.4.3
 	mvdan.cc/gofumpt v0.5.0
 	mvdan.cc/unparam v0.0.0-20230312165513-e84e2d14e3b8
 )

 require (
-	github.com/BurntSushi/toml v1.2.1 // indirect
+	github.com/BurntSushi/toml v1.3.1 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/gookit/color v1.5.3 // indirect
@ -25,9 +25,9 @@ require (
 	github.com/nbutton23/zxcvbn-go v0.0.0-20210217022336-fa2cb2858354 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	golang.org/x/exp v0.0.0-20230321023759-10a507213a29 // indirect
-	golang.org/x/exp/typeparams v0.0.0-20230321023759-10a507213a29 // indirect
+	golang.org/x/exp/typeparams v0.0.0-20230522175609-2e198f4a06a1 // indirect
 	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/sync v0.1.0 // indirect
-	golang.org/x/sys v0.7.0 // indirect
+	golang.org/x/sync v0.2.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
--- a/internal/tools/go.sum
+++ b/internal/tools/go.sum
@ -1,17 +1,19 @@
-github.com/BurntSushi/toml v1.2.1 h1:9F2/+DoOYIOksmaJFPw1tGFy1eDnIJXg+UHjuD8lTak=
-github.com/BurntSushi/toml v1.2.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/BurntSushi/toml v1.3.1 h1:rHnDkSK+/g6DlREUK73PkmIs60pqrnuduK+JmP++JmU=
+github.com/BurntSushi/toml v1.3.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/frankban/quicktest v1.14.4 h1:g2rn0vABPOOXmZUj+vbmUp0lPoXEMuhTpIluN0XL9UY=
 github.com/fzipp/gocyclo v0.6.0 h1:lsblElZG7d3ALtGMx9fmxeTKZaLLpU8mET09yN4BBLo=
 github.com/fzipp/gocyclo v0.6.0/go.mod h1:rXPyn8fnlpa0R2csP/31uerbiVBugk5whMdlyaLkLoA=
-github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
+github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
+github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
 github.com/golangci/misspell v0.4.0 h1:KtVB/hTK4bbL/S6bs64rYyk8adjmh1BygbBiaAiX+a0=
 github.com/golangci/misspell v0.4.0/go.mod h1:W6O/bwV6lGDxUCChm2ykw9NQdd5bYd1Xkjo88UcWyJc=
 github.com/google/go-cmdtest v0.4.1-0.20220921163831-55ab3332a786 h1:rcv+Ippz6RAtvaGgKxc+8FQIpxHgsF+HBzPyYL2cyVU=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
 github.com/google/renameio v0.1.0 h1:GOZbcHa3HfsPKPlmyPyN2KEohoMXOhdMbHrvbpl2QaA=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
@ -29,13 +31,13 @@ github.com/kyoh86/nolint v0.0.1 h1:GjNxDEkVn2wAxKHtP7iNTrRxytRZ1wXxLV5j4XzGfRU=
 github.com/kyoh86/nolint v0.0.1/go.mod h1:1ZiZZ7qqrZ9dZegU96phwVcdQOMKIqRzFJL3ewq9gtI=
 github.com/nbutton23/zxcvbn-go v0.0.0-20210217022336-fa2cb2858354 h1:4kuARK6Y6FxaNu/BnU2OAaLF86eTVhP2hjTB6iMvItA=
 github.com/nbutton23/zxcvbn-go v0.0.0-20210217022336-fa2cb2858354/go.mod h1:KSVJerMDfblTH7p5MZaTt+8zaT2iEk3AkVb9PQdZuE8=
-github.com/onsi/ginkgo/v2 v2.8.0 h1:pAM+oBNPrpXRs+E/8spkeGx9QgekbRVyr74EUvRVOUI=
-github.com/onsi/gomega v1.26.0 h1:03cDLK28U6hWvCAns6NeydX3zIm4SF3ci69ulidS32Q=
+github.com/onsi/ginkgo/v2 v2.9.4 h1:xR7vG4IXt5RWx6FfIjyAtsoMAtnc3C/rFXBBd2AjZwE=
+github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
-github.com/securego/gosec/v2 v2.15.0 h1:v4Ym7FF58/jlykYmmhZ7mTm7FQvN/setNm++0fgIAtw=
-github.com/securego/gosec/v2 v2.15.0/go.mod h1:VOjTrZOkUtSDt2QLSJmQBMWnvwiQPEjg0l+5juIqGk8=
+github.com/securego/gosec/v2 v2.16.0 h1:Pi0JKoasQQ3NnoRao/ww/N/XdynIB9NRYYZT5CyOs5U=
+github.com/securego/gosec/v2 v2.16.0/go.mod h1:xvLcVZqUfo4aAQu56TNv7/Ltz6emAOQAEsrZrt7uGlI=
 github.com/stretchr/testify v1.1.4/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
@ -49,8 +51,8 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20230321023759-10a507213a29 h1:ooxPy7fPvB4kwsA2h+iBNHkAbp/4JxTSwCmvdjEYmug=
 golang.org/x/exp v0.0.0-20230321023759-10a507213a29/go.mod h1:CxIveKay+FTh1D0yPZemJVgC/95VzuuOLq5Qi4xnoYc=
-golang.org/x/exp/typeparams v0.0.0-20230321023759-10a507213a29 h1:e7LhZmJ631l59keHP9ssC3sgSn3/oiEHKHKXDkimURY=
-golang.org/x/exp/typeparams v0.0.0-20230321023759-10a507213a29/go.mod h1:AbB0pIl9nAr9wVwH+Z2ZpaocVmF5I4GyWCDIsVjR0bk=
+golang.org/x/exp/typeparams v0.0.0-20230522175609-2e198f4a06a1 h1:pnP8r+W8Fm7XJ8CWtXi4S9oJmPBTrkfYN/dNbaPj6Y4=
+golang.org/x/exp/typeparams v0.0.0-20230522175609-2e198f4a06a1/go.mod h1:AbB0pIl9nAr9wVwH+Z2ZpaocVmF5I4GyWCDIsVjR0bk=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
@ -62,12 +64,12 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.9.0 h1:aWJ/m6xSmxWBx+V0XRHTlrYrPG56jKsLdTFmsSsCzOM=
+golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
-golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
+golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@ -77,23 +79,23 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
-golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.6.0 h1:3XmdazWV+ubf7QgHSTWeykHOci5oeekaGJBLkrkaw4k=
+golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20201007032633-0806396f153e/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
-golang.org/x/tools v0.8.0 h1:vSDcovVPld282ceKgDimkRSC8kpaH1dgyc9UMzlt84Y=
-golang.org/x/tools v0.8.0/go.mod h1:JxBZ99ISMI5ViVkT1tr6tdNmXeTrcpVSD3vZ1RsRdN4=
-golang.org/x/vuln v0.0.0-20230418010118-28ba02ac73db h1:tLxfII6jPR3mfwEMkyOakawu+Lldo9hIA7vliXnDZYg=
-golang.org/x/vuln v0.0.0-20230418010118-28ba02ac73db/go.mod h1:64LpnL2PuSMzFYeCmJjYiRbroOUG9aCZYznINnF5PHE=
+golang.org/x/tools v0.9.3 h1:Gn1I8+64MsuTb/HpH+LmQtNas23LhUVr3rYZ0eKuaMM=
+golang.org/x/tools v0.9.3/go.mod h1:owI94Op576fPu3cIGQeHs3joujW/2Oc6MtlxbF5dfNc=
+golang.org/x/vuln v0.1.0 h1:9GRdj6wAIkDrsMevuolY+SXERPjQPp2P1ysYA0jpZe0=
+golang.org/x/vuln v0.1.0/go.mod h1:/YuzZYjGbwB8y19CisAppfyw3uTZnuCz3r+qgx/QRzU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
--- a/openapi/CHANGELOG.md
+++ b/openapi/CHANGELOG.md
@ -4,6 +4,28 @@

 ## v0.108.0: API changes

+## v0.107.30: API changes
+
+### `POST /control/version.json` and `GET /control/dhcp/interfaces` content type
+
+* The value of the `Content-Type` header in the `POST /control/version.json` and
+  `GET /control/dhcp/interfaces` HTTP APIs is now correctly set to
+  `application/json` as opposed to `text/plain`.
+
+### New HTTP API 'PUT /control/rewrite/update'
+
+* The new `PUT /control/rewrite/update` HTTP API allows rewrite rule updates.
+  It accepts a JSON object with the following format:
+
+```json
+{
+  "target": {"domain":"example.com","answer":"answer-to-update"},
+  "update": {"domain":"example.com","answer":"new-answer"}
+}
+```
+
+
+
 ## v0.107.29: API changes

 ### `GET /control/clients` And `GET /control/clients/find`
@ -16,6 +38,8 @@
  set AdGuard Home will use default value (false).  It can be changed in the
  future versions.

+
+
 ## v0.107.27: API changes

 ### The new optional fields `"edns_cs_use_custom"` and `"edns_cs_custom_ip"` in `DNSConfig`
--- a/scripts/make/go-lint.sh
+++ b/scripts/make/go-lint.sh
@ -35,7 +35,7 @@ set -f -u
 go_version="$( "${GO:-go}" version )"
 readonly go_version

-go_min_version='go1.19.8'
+go_min_version='go1.19.10'
 go_version_msg="
 warning: your go version (${go_version}) is different from the recommended minimal one (${go_min_version}).
 if you have the version installed, please set the GO environment variable.
@ -159,30 +159,7 @@ run_linter "$GO" vet ./...

 run_linter govulncheck ./...

-# Apply more lax standards to the code we haven't properly refactored yet.
-run_linter gocyclo --over 13\
-	./internal/dhcpd\
-	./internal/home/\
-	./internal/querylog/\
-	;
-
-# Apply the normal standards to new or somewhat refactored code.
-run_linter gocyclo --over 10\
-	./internal/aghio/\
-	./internal/aghnet/\
-	./internal/aghos/\
-	./internal/aghtest/\
-	./internal/dnsforward/\
-	./internal/filtering/\
-	./internal/stats/\
-	./internal/tools/\
-	./internal/updater/\
-	./internal/version/\
-	./scripts/blocked-services/\
-	./scripts/vetted-filters/\
-	./scripts/translations/\
-	./main.go\
-	;
+run_linter gocyclo --over 10 .

 run_linter ineffassign ./...