1139 lines
31 KiB
Go
1139 lines
31 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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coredns_plugin "github.com/AdguardTeam/AdGuardHome/coredns_plugin"
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"github.com/AdguardTeam/AdGuardHome/dnsfilter"
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"github.com/miekg/dns"
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"gopkg.in/asaskevich/govalidator.v4"
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)
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const updatePeriod = time.Minute * 30
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var filterTitle = regexp.MustCompile(`^! Title: +(.*)$`)
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// cached version.json to avoid hammering github.io for each page reload
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var versionCheckJSON []byte
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var versionCheckLastTime time.Time
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const versionCheckURL = "https://adguardteam.github.io/AdGuardHome/version.json"
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const versionCheckPeriod = time.Hour * 8
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var client = &http.Client{
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Timeout: time.Second * 30,
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}
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// -------------------
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// coredns run control
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// -------------------
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func tellCoreDNSToReload() {
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coredns_plugin.Reload <- true
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}
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func writeAllConfigsAndReloadCoreDNS() error {
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err := writeAllConfigs()
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if err != nil {
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log.Printf("Couldn't write all configs: %s", err)
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return err
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}
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tellCoreDNSToReload()
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return nil
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}
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func httpUpdateConfigReloadDNSReturnOK(w http.ResponseWriter, r *http.Request) {
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err := writeAllConfigsAndReloadCoreDNS()
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write config file: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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return
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}
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returnOK(w, r)
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}
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func returnOK(w http.ResponseWriter, r *http.Request) {
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_, err := fmt.Fprintf(w, "OK\n")
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleStatus(w http.ResponseWriter, r *http.Request) {
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data := map[string]interface{}{
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"dns_address": config.BindHost,
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"dns_port": config.CoreDNS.Port,
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"protection_enabled": config.CoreDNS.ProtectionEnabled,
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"querylog_enabled": config.CoreDNS.QueryLogEnabled,
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"running": isRunning(),
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"upstream_dns": config.CoreDNS.UpstreamDNS,
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"version": VersionString,
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}
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json, err := json.Marshal(data)
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if err != nil {
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errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, 500)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(json)
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if err != nil {
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errortext := fmt.Sprintf("Unable to write response json: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, 500)
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return
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}
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}
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func handleProtectionEnable(w http.ResponseWriter, r *http.Request) {
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config.CoreDNS.ProtectionEnabled = true
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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func handleProtectionDisable(w http.ResponseWriter, r *http.Request) {
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config.CoreDNS.ProtectionEnabled = false
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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// -----
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// stats
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// -----
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func handleStats(w http.ResponseWriter, r *http.Request) {
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resp, err := client.Get("http://127.0.0.1:8618/stats")
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if err != nil {
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errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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if resp != nil && resp.Body != nil {
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defer resp.Body.Close()
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}
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// read the body entirely
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't read response body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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// forward body entirely with status code
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Content-Length", strconv.Itoa(len(body)))
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w.WriteHeader(resp.StatusCode)
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_, err = w.Write(body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleStatsHistory(w http.ResponseWriter, r *http.Request) {
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resp, err := client.Get("http://127.0.0.1:8618/stats_history?" + r.URL.RawQuery)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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if resp != nil && resp.Body != nil {
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defer resp.Body.Close()
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}
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// read the body entirely
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't read response body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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// forward body entirely with status code
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Content-Length", strconv.Itoa(len(body)))
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w.WriteHeader(resp.StatusCode)
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_, err = w.Write(body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleQueryLog(w http.ResponseWriter, r *http.Request) {
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isDownload := r.URL.Query().Get("download") != ""
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resp, err := client.Get("http://127.0.0.1:8618/querylog")
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if err != nil {
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errortext := fmt.Sprintf("Couldn't get querylog from coredns: %T %s\n", err, err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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if resp != nil && resp.Body != nil {
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defer resp.Body.Close()
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}
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// read the body entirely
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't read response body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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// forward body entirely with status code
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Content-Length", strconv.Itoa(len(body)))
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if isDownload {
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w.Header().Set("Content-Disposition", "attachment; filename=querylog.json")
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}
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w.WriteHeader(resp.StatusCode)
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_, err = w.Write(body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleQueryLogEnable(w http.ResponseWriter, r *http.Request) {
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config.CoreDNS.QueryLogEnabled = true
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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func handleQueryLogDisable(w http.ResponseWriter, r *http.Request) {
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config.CoreDNS.QueryLogEnabled = false
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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func handleStatsReset(w http.ResponseWriter, r *http.Request) {
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resp, err := client.Post("http://127.0.0.1:8618/stats_reset", "text/plain", nil)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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if resp != nil && resp.Body != nil {
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defer resp.Body.Close()
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}
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// read the body entirely
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't read response body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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// forward body entirely with status code
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Content-Length", strconv.Itoa(len(body)))
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w.WriteHeader(resp.StatusCode)
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_, err = w.Write(body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleStatsTop(w http.ResponseWriter, r *http.Request) {
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resp, err := client.Get("http://127.0.0.1:8618/stats_top")
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if err != nil {
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errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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if resp != nil && resp.Body != nil {
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defer resp.Body.Close()
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}
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// read the body entirely
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't read response body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadGateway)
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return
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}
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// forward body entirely with status code
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w.Header().Set("Content-Type", "application/json")
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w.Header().Set("Content-Length", strconv.Itoa(len(body)))
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w.WriteHeader(resp.StatusCode)
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_, err = w.Write(body)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func httpError(w http.ResponseWriter, code int, format string, args ...interface{}) {
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text := fmt.Sprintf(format, args...)
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log.Println(text)
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http.Error(w, text, code)
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}
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func handleSetUpstreamDNS(w http.ResponseWriter, r *http.Request) {
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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errortext := fmt.Sprintf("Failed to read request body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadRequest)
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return
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}
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// if empty body -- user is asking for default servers
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hosts, err := sanitiseDNSServers(string(body))
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if err != nil {
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httpError(w, http.StatusBadRequest, "Invalid DNS servers were given: %s", err)
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return
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}
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if len(hosts) == 0 {
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config.CoreDNS.UpstreamDNS = defaultDNS
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} else {
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config.CoreDNS.UpstreamDNS = hosts
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}
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err = writeAllConfigs()
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write config file: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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return
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}
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tellCoreDNSToReload()
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_, err = fmt.Fprintf(w, "OK %d servers\n", len(hosts))
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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errortext := fmt.Sprintf("Failed to read request body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, 400)
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return
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}
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hosts := strings.Fields(string(body))
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if len(hosts) == 0 {
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errortext := fmt.Sprintf("No servers specified")
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log.Println(errortext)
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http.Error(w, errortext, http.StatusBadRequest)
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return
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}
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result := map[string]string{}
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for _, host := range hosts {
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err = checkDNS(host)
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if err != nil {
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log.Println(err)
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result[host] = err.Error()
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} else {
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result[host] = "OK"
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}
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}
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json, err := json.Marshal(result)
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if err != nil {
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errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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_, err = w.Write(json)
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if err != nil {
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errortext := fmt.Sprintf("Couldn't write body: %s", err)
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log.Println(errortext)
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http.Error(w, errortext, http.StatusInternalServerError)
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}
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}
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func checkDNS(input string) error {
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input, err := sanitizeDNSServer(input)
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if err != nil {
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return err
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}
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{"google-public-dns-a.google.com.", dns.TypeA, dns.ClassINET},
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}
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prefix, host := splitDNSServerPrefixServer(input)
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c := dns.Client{
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Timeout: time.Minute,
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}
|
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switch prefix {
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case "tls://":
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c.Net = "tcp-tls"
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}
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resp, rtt, err := c.Exchange(&req, host)
|
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if err != nil {
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return fmt.Errorf("Couldn't communicate with DNS server %s: %s", input, err)
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}
|
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trace("exchange with %s took %v", input, rtt)
|
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if len(resp.Answer) != 1 {
|
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return fmt.Errorf("DNS server %s returned wrong answer", input)
|
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}
|
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if t, ok := resp.Answer[0].(*dns.A); ok {
|
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if !net.IPv4(8, 8, 8, 8).Equal(t.A) {
|
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return fmt.Errorf("DNS server %s returned wrong answer: %v", input, t.A)
|
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}
|
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}
|
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|
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return nil
|
|
}
|
|
|
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func sanitiseDNSServers(input string) ([]string, error) {
|
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fields := strings.Fields(input)
|
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hosts := []string{}
|
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for _, field := range fields {
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sanitized, err := sanitizeDNSServer(field)
|
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if err != nil {
|
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return hosts, err
|
|
}
|
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hosts = append(hosts, sanitized)
|
|
}
|
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return hosts, nil
|
|
}
|
|
|
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func getDNSServerPrefix(input string) string {
|
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prefix := ""
|
|
switch {
|
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case strings.HasPrefix(input, "dns://"):
|
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prefix = "dns://"
|
|
case strings.HasPrefix(input, "tls://"):
|
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prefix = "tls://"
|
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}
|
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return prefix
|
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}
|
|
|
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func splitDNSServerPrefixServer(input string) (string, string) {
|
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prefix := getDNSServerPrefix(input)
|
|
host := strings.TrimPrefix(input, prefix)
|
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return prefix, host
|
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}
|
|
|
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func sanitizeDNSServer(input string) (string, error) {
|
|
prefix, host := splitDNSServerPrefixServer(input)
|
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host = appendPortIfMissing(prefix, host)
|
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{
|
|
h, _, err := net.SplitHostPort(host)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
ip := net.ParseIP(h)
|
|
if ip == nil {
|
|
return "", fmt.Errorf("Invalid DNS server field: %s", h)
|
|
}
|
|
}
|
|
return prefix + host, nil
|
|
}
|
|
|
|
func appendPortIfMissing(prefix, input string) string {
|
|
port := "53"
|
|
switch prefix {
|
|
case "tls://":
|
|
port = "853"
|
|
}
|
|
_, _, err := net.SplitHostPort(input)
|
|
if err == nil {
|
|
return input
|
|
}
|
|
return net.JoinHostPort(input, port)
|
|
}
|
|
|
|
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
|
|
now := time.Now()
|
|
if now.Sub(versionCheckLastTime) <= versionCheckPeriod && len(versionCheckJSON) != 0 {
|
|
// return cached copy
|
|
w.Header().Set("Content-Type", "application/json")
|
|
w.Write(versionCheckJSON)
|
|
return
|
|
}
|
|
|
|
resp, err := client.Get(versionCheckURL)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't get querylog from coredns: %T %s\n", err, err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadGateway)
|
|
return
|
|
}
|
|
if resp != nil && resp.Body != nil {
|
|
defer resp.Body.Close()
|
|
}
|
|
|
|
// read the body entirely
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't read response body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadGateway)
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
_, err = w.Write(body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
}
|
|
|
|
versionCheckLastTime = now
|
|
versionCheckJSON = body
|
|
}
|
|
|
|
// ---------
|
|
// filtering
|
|
// ---------
|
|
|
|
func handleFilteringEnable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.FilteringEnabled = true
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringDisable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.FilteringEnabled = false
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringStatus(w http.ResponseWriter, r *http.Request) {
|
|
data := map[string]interface{}{
|
|
"enabled": config.CoreDNS.FilteringEnabled,
|
|
}
|
|
|
|
config.RLock()
|
|
data["filters"] = config.Filters
|
|
data["user_rules"] = config.UserRules
|
|
json, err := json.Marshal(data)
|
|
config.RUnlock()
|
|
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
_, err = w.Write(json)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
}
|
|
|
|
func handleFilteringAddURL(w http.ResponseWriter, r *http.Request) {
|
|
filter := filter{}
|
|
err := json.NewDecoder(r.Body).Decode(&filter)
|
|
if err != nil {
|
|
httpError(w, http.StatusBadRequest, "Failed to parse request body json: %s", err)
|
|
return
|
|
}
|
|
|
|
filter.Enabled = true
|
|
if len(filter.URL) == 0 {
|
|
http.Error(w, "URL parameter was not specified", 400)
|
|
return
|
|
}
|
|
|
|
if valid := govalidator.IsRequestURL(filter.URL); !valid {
|
|
http.Error(w, "URL parameter is not valid request URL", 400)
|
|
return
|
|
}
|
|
|
|
// check for duplicates
|
|
for i := range config.Filters {
|
|
if config.Filters[i].URL == filter.URL {
|
|
errortext := fmt.Sprintf("Filter URL already added -- %s", filter.URL)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadRequest)
|
|
return
|
|
}
|
|
}
|
|
|
|
ok, err := filter.update(time.Now())
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't fetch filter from url %s: %s", filter.URL, err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadRequest)
|
|
return
|
|
}
|
|
if filter.RulesCount == 0 {
|
|
errortext := fmt.Sprintf("Filter at url %s has no rules (maybe it points to blank page?)", filter.URL)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadRequest)
|
|
return
|
|
}
|
|
if !ok {
|
|
errortext := fmt.Sprintf("Filter at url %s is invalid (maybe it points to blank page?)", filter.URL)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
// URL is deemed valid, append it to filters, update config, write new filter file and tell coredns to reload it
|
|
config.Filters = append(config.Filters, filter)
|
|
err = writeAllConfigs()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write config file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
err = writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
tellCoreDNSToReload()
|
|
_, err = fmt.Fprintf(w, "OK %d rules\n", filter.RulesCount)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
}
|
|
}
|
|
|
|
func handleFilteringRemoveURL(w http.ResponseWriter, r *http.Request) {
|
|
parameters, err := parseParametersFromBody(r.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 400)
|
|
return
|
|
}
|
|
|
|
url, ok := parameters["url"]
|
|
if !ok {
|
|
http.Error(w, "URL parameter was not specified", 400)
|
|
return
|
|
}
|
|
|
|
if valid := govalidator.IsRequestURL(url); !valid {
|
|
http.Error(w, "URL parameter is not valid request URL", 400)
|
|
return
|
|
}
|
|
|
|
// go through each element and delete if url matches
|
|
newFilters := config.Filters[:0]
|
|
for _, filter := range config.Filters {
|
|
if filter.URL != url {
|
|
newFilters = append(newFilters, filter)
|
|
}
|
|
}
|
|
config.Filters = newFilters
|
|
err = writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringEnableURL(w http.ResponseWriter, r *http.Request) {
|
|
parameters, err := parseParametersFromBody(r.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 400)
|
|
return
|
|
}
|
|
|
|
url, ok := parameters["url"]
|
|
if !ok {
|
|
http.Error(w, "URL parameter was not specified", 400)
|
|
return
|
|
}
|
|
|
|
if valid := govalidator.IsRequestURL(url); !valid {
|
|
http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
found := false
|
|
for i := range config.Filters {
|
|
filter := &config.Filters[i] // otherwise we will be operating on a copy
|
|
if filter.URL == url {
|
|
filter.Enabled = true
|
|
found = true
|
|
}
|
|
}
|
|
|
|
if !found {
|
|
http.Error(w, "URL parameter was not previously added", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
// kick off refresh of rules from new URLs
|
|
refreshFiltersIfNeccessary()
|
|
err = writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringDisableURL(w http.ResponseWriter, r *http.Request) {
|
|
parameters, err := parseParametersFromBody(r.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 400)
|
|
return
|
|
}
|
|
|
|
url, ok := parameters["url"]
|
|
if !ok {
|
|
http.Error(w, "URL parameter was not specified", 400)
|
|
return
|
|
}
|
|
|
|
if valid := govalidator.IsRequestURL(url); !valid {
|
|
http.Error(w, "URL parameter is not valid request URL", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
found := false
|
|
for i := range config.Filters {
|
|
filter := &config.Filters[i] // otherwise we will be operating on a copy
|
|
if filter.URL == url {
|
|
filter.Enabled = false
|
|
found = true
|
|
}
|
|
}
|
|
|
|
if !found {
|
|
http.Error(w, "URL parameter was not previously added", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
err = writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringSetRules(w http.ResponseWriter, r *http.Request) {
|
|
body, err := ioutil.ReadAll(r.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Failed to read request body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 400)
|
|
return
|
|
}
|
|
|
|
config.UserRules = strings.Split(string(body), "\n")
|
|
err = writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, http.StatusInternalServerError)
|
|
return
|
|
}
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleFilteringRefresh(w http.ResponseWriter, r *http.Request) {
|
|
force := r.URL.Query().Get("force")
|
|
if force != "" {
|
|
config.Lock()
|
|
for i := range config.Filters {
|
|
filter := &config.Filters[i] // otherwise we will be operating on a copy
|
|
filter.LastUpdated = time.Unix(0, 0)
|
|
}
|
|
config.Unlock() // not defer because refreshFiltersIfNeccessary locks it too
|
|
}
|
|
updated := refreshFiltersIfNeccessary()
|
|
fmt.Fprintf(w, "OK %d filters updated\n", updated)
|
|
}
|
|
|
|
func runFilterRefreshers() {
|
|
go func() {
|
|
for range time.Tick(time.Second) {
|
|
refreshFiltersIfNeccessary()
|
|
}
|
|
}()
|
|
}
|
|
|
|
func refreshFiltersIfNeccessary() int {
|
|
now := time.Now()
|
|
config.Lock()
|
|
|
|
// deduplicate
|
|
// TODO: move it somewhere else
|
|
{
|
|
i := 0 // output index, used for deletion later
|
|
urls := map[string]bool{}
|
|
for _, filter := range config.Filters {
|
|
if _, ok := urls[filter.URL]; !ok {
|
|
// we didn't see it before, keep it
|
|
urls[filter.URL] = true // remember the URL
|
|
config.Filters[i] = filter
|
|
i++
|
|
}
|
|
}
|
|
// all entries we want to keep are at front, delete the rest
|
|
config.Filters = config.Filters[:i]
|
|
}
|
|
|
|
// fetch URLs
|
|
updateCount := 0
|
|
for i := range config.Filters {
|
|
filter := &config.Filters[i] // otherwise we will be operating on a copy
|
|
updated, err := filter.update(now)
|
|
if err != nil {
|
|
log.Printf("Failed to update filter %s: %s\n", filter.URL, err)
|
|
continue
|
|
}
|
|
if updated {
|
|
updateCount++
|
|
}
|
|
}
|
|
config.Unlock()
|
|
|
|
if updateCount > 0 {
|
|
err := writeFilterFile()
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Couldn't write filter file: %s", err)
|
|
log.Println(errortext)
|
|
}
|
|
tellCoreDNSToReload()
|
|
}
|
|
return updateCount
|
|
}
|
|
|
|
func (filter *filter) update(now time.Time) (bool, error) {
|
|
if !filter.Enabled {
|
|
return false, nil
|
|
}
|
|
elapsed := time.Since(filter.LastUpdated)
|
|
if elapsed <= updatePeriod {
|
|
return false, nil
|
|
}
|
|
|
|
// use same update period for failed filter downloads to avoid flooding with requests
|
|
filter.LastUpdated = now
|
|
|
|
resp, err := client.Get(filter.URL)
|
|
if resp != nil && resp.Body != nil {
|
|
defer resp.Body.Close()
|
|
}
|
|
if err != nil {
|
|
log.Printf("Couldn't request filter from URL %s, skipping: %s", filter.URL, err)
|
|
return false, err
|
|
}
|
|
|
|
if resp.StatusCode >= 400 {
|
|
log.Printf("Got status code %d from URL %s, skipping", resp.StatusCode, filter.URL)
|
|
return false, fmt.Errorf("Got status code >= 400: %d", resp.StatusCode)
|
|
}
|
|
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
log.Printf("Couldn't fetch filter contents from URL %s, skipping: %s", filter.URL, err)
|
|
return false, err
|
|
}
|
|
|
|
// extract filter name and count number of rules
|
|
lines := strings.Split(string(body), "\n")
|
|
rulesCount := 0
|
|
seenTitle := false
|
|
d := dnsfilter.New()
|
|
for _, line := range lines {
|
|
line = strings.TrimSpace(line)
|
|
if len(line) > 0 && line[0] == '!' {
|
|
if m := filterTitle.FindAllStringSubmatch(line, -1); len(m) > 0 && len(m[0]) >= 2 && !seenTitle {
|
|
filter.Name = m[0][1]
|
|
seenTitle = true
|
|
}
|
|
} else if len(line) != 0 {
|
|
err = d.AddRule(line, 0)
|
|
if err == dnsfilter.ErrInvalidSyntax {
|
|
continue
|
|
}
|
|
if err != nil {
|
|
log.Printf("Couldn't add rule %s: %s", filter.URL, err)
|
|
return false, err
|
|
}
|
|
rulesCount++
|
|
}
|
|
}
|
|
if bytes.Equal(filter.contents, body) {
|
|
return false, nil
|
|
}
|
|
log.Printf("Filter %s updated: %d bytes, %d rules", filter.URL, len(body), rulesCount)
|
|
filter.RulesCount = rulesCount
|
|
filter.contents = body
|
|
return true, nil
|
|
}
|
|
|
|
// write filter file
|
|
func writeFilterFile() error {
|
|
filterpath := filepath.Join(config.ourBinaryDir, config.CoreDNS.FilterFile)
|
|
log.Printf("Writing filter file: %s", filterpath)
|
|
// TODO: check if file contents have modified
|
|
data := []byte{}
|
|
config.RLock()
|
|
filters := config.Filters
|
|
for _, filter := range filters {
|
|
if !filter.Enabled {
|
|
continue
|
|
}
|
|
data = append(data, filter.contents...)
|
|
data = append(data, '\n')
|
|
}
|
|
for _, rule := range config.UserRules {
|
|
data = append(data, []byte(rule)...)
|
|
data = append(data, '\n')
|
|
}
|
|
config.RUnlock()
|
|
err := ioutil.WriteFile(filterpath+".tmp", data, 0644)
|
|
if err != nil {
|
|
log.Printf("Couldn't write filter file: %s", err)
|
|
return err
|
|
}
|
|
|
|
err = os.Rename(filterpath+".tmp", filterpath)
|
|
if err != nil {
|
|
log.Printf("Couldn't rename filter file: %s", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ------------
|
|
// safebrowsing
|
|
// ------------
|
|
|
|
func handleSafeBrowsingEnable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.SafeBrowsingEnabled = true
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleSafeBrowsingDisable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.SafeBrowsingEnabled = false
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
|
|
data := map[string]interface{}{
|
|
"enabled": config.CoreDNS.SafeBrowsingEnabled,
|
|
}
|
|
json, err := json.Marshal(data)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
_, err = w.Write(json)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
}
|
|
|
|
// --------
|
|
// parental
|
|
// --------
|
|
func handleParentalEnable(w http.ResponseWriter, r *http.Request) {
|
|
parameters, err := parseParametersFromBody(r.Body)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 400)
|
|
return
|
|
}
|
|
|
|
sensitivity, ok := parameters["sensitivity"]
|
|
if !ok {
|
|
http.Error(w, "URL parameter was not specified", 400)
|
|
return
|
|
}
|
|
|
|
switch sensitivity {
|
|
case "3":
|
|
break
|
|
case "EARLY_CHILDHOOD":
|
|
sensitivity = "3"
|
|
case "10":
|
|
break
|
|
case "YOUNG":
|
|
sensitivity = "10"
|
|
case "13":
|
|
break
|
|
case "TEEN":
|
|
sensitivity = "13"
|
|
case "17":
|
|
break
|
|
case "MATURE":
|
|
sensitivity = "17"
|
|
default:
|
|
http.Error(w, "Sensitivity must be set to valid value", 400)
|
|
return
|
|
}
|
|
i, err := strconv.Atoi(sensitivity)
|
|
if err != nil {
|
|
http.Error(w, "Sensitivity must be set to valid value", 400)
|
|
return
|
|
}
|
|
config.CoreDNS.ParentalSensitivity = i
|
|
config.CoreDNS.ParentalEnabled = true
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleParentalDisable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.ParentalEnabled = false
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleParentalStatus(w http.ResponseWriter, r *http.Request) {
|
|
data := map[string]interface{}{
|
|
"enabled": config.CoreDNS.ParentalEnabled,
|
|
}
|
|
if config.CoreDNS.ParentalEnabled {
|
|
data["sensitivity"] = config.CoreDNS.ParentalSensitivity
|
|
}
|
|
json, err := json.Marshal(data)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
_, err = w.Write(json)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
}
|
|
|
|
// ------------
|
|
// safebrowsing
|
|
// ------------
|
|
|
|
func handleSafeSearchEnable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.SafeSearchEnabled = true
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleSafeSearchDisable(w http.ResponseWriter, r *http.Request) {
|
|
config.CoreDNS.SafeSearchEnabled = false
|
|
httpUpdateConfigReloadDNSReturnOK(w, r)
|
|
}
|
|
|
|
func handleSafeSearchStatus(w http.ResponseWriter, r *http.Request) {
|
|
data := map[string]interface{}{
|
|
"enabled": config.CoreDNS.SafeSearchEnabled,
|
|
}
|
|
json, err := json.Marshal(data)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
_, err = w.Write(json)
|
|
if err != nil {
|
|
errortext := fmt.Sprintf("Unable to write response json: %s", err)
|
|
log.Println(errortext)
|
|
http.Error(w, errortext, 500)
|
|
return
|
|
}
|
|
}
|
|
|
|
func registerControlHandlers() {
|
|
http.HandleFunc("/control/status", optionalAuth(ensureGET(handleStatus)))
|
|
http.HandleFunc("/control/enable_protection", optionalAuth(ensurePOST(handleProtectionEnable)))
|
|
http.HandleFunc("/control/disable_protection", optionalAuth(ensurePOST(handleProtectionDisable)))
|
|
http.HandleFunc("/control/querylog", optionalAuth(ensureGET(handleQueryLog)))
|
|
http.HandleFunc("/control/querylog_enable", optionalAuth(ensurePOST(handleQueryLogEnable)))
|
|
http.HandleFunc("/control/querylog_disable", optionalAuth(ensurePOST(handleQueryLogDisable)))
|
|
http.HandleFunc("/control/set_upstream_dns", optionalAuth(ensurePOST(handleSetUpstreamDNS)))
|
|
http.HandleFunc("/control/test_upstream_dns", optionalAuth(ensurePOST(handleTestUpstreamDNS)))
|
|
http.HandleFunc("/control/stats_top", optionalAuth(ensureGET(handleStatsTop)))
|
|
http.HandleFunc("/control/stats", optionalAuth(ensureGET(handleStats)))
|
|
http.HandleFunc("/control/stats_history", optionalAuth(ensureGET(handleStatsHistory)))
|
|
http.HandleFunc("/control/stats_reset", optionalAuth(ensurePOST(handleStatsReset)))
|
|
http.HandleFunc("/control/version.json", optionalAuth(handleGetVersionJSON))
|
|
http.HandleFunc("/control/filtering/enable", optionalAuth(ensurePOST(handleFilteringEnable)))
|
|
http.HandleFunc("/control/filtering/disable", optionalAuth(ensurePOST(handleFilteringDisable)))
|
|
http.HandleFunc("/control/filtering/add_url", optionalAuth(ensurePUT(handleFilteringAddURL)))
|
|
http.HandleFunc("/control/filtering/remove_url", optionalAuth(ensureDELETE(handleFilteringRemoveURL)))
|
|
http.HandleFunc("/control/filtering/enable_url", optionalAuth(ensurePOST(handleFilteringEnableURL)))
|
|
http.HandleFunc("/control/filtering/disable_url", optionalAuth(ensurePOST(handleFilteringDisableURL)))
|
|
http.HandleFunc("/control/filtering/refresh", optionalAuth(ensurePOST(handleFilteringRefresh)))
|
|
http.HandleFunc("/control/filtering/status", optionalAuth(ensureGET(handleFilteringStatus)))
|
|
http.HandleFunc("/control/filtering/set_rules", optionalAuth(ensurePUT(handleFilteringSetRules)))
|
|
http.HandleFunc("/control/safebrowsing/enable", optionalAuth(ensurePOST(handleSafeBrowsingEnable)))
|
|
http.HandleFunc("/control/safebrowsing/disable", optionalAuth(ensurePOST(handleSafeBrowsingDisable)))
|
|
http.HandleFunc("/control/safebrowsing/status", optionalAuth(ensureGET(handleSafeBrowsingStatus)))
|
|
http.HandleFunc("/control/parental/enable", optionalAuth(ensurePOST(handleParentalEnable)))
|
|
http.HandleFunc("/control/parental/disable", optionalAuth(ensurePOST(handleParentalDisable)))
|
|
http.HandleFunc("/control/parental/status", optionalAuth(ensureGET(handleParentalStatus)))
|
|
http.HandleFunc("/control/safesearch/enable", optionalAuth(ensurePOST(handleSafeSearchEnable)))
|
|
http.HandleFunc("/control/safesearch/disable", optionalAuth(ensurePOST(handleSafeSearchDisable)))
|
|
http.HandleFunc("/control/safesearch/status", optionalAuth(ensureGET(handleSafeSearchStatus)))
|
|
}
|