Pull request 2159: Upd proxy

Squashed commit of the following:

commit 4468e826bcf8e856014059cac7cd83aa6d754ab0
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Mar 11 13:50:36 2024 +0300

    all: upd dnsproxy

commit 7887f521799b75ea43aac8eca0586d26a1287c94
Merge: 9120da6ab 36f9fecae
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Mar 11 13:50:09 2024 +0300

    Merge branch 'master' into upd-proxy

commit 9120da6ab841fc8f9090c16f0cfe6a103073c772
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Mar 5 11:50:16 2024 +0300

    all: upd proxy

go.mod

@@ -3,7 +3,7 @@ module github.com/AdguardTeam/AdGuardHome
 go 1.21.8
 
 require (
-	github.com/AdguardTeam/dnsproxy v0.65.2
+	github.com/AdguardTeam/dnsproxy v0.66.0
 	github.com/AdguardTeam/golibs v0.20.1
 	github.com/AdguardTeam/urlfilter v0.18.0
 	github.com/NYTimes/gziphandler v1.1.1

go.sum

@@ -1,5 +1,5 @@
-github.com/AdguardTeam/dnsproxy v0.65.2 h1:D+BMw0Vu2lbQrYpoPctG2Xr+24KdfhgkzZb6QgPZheM=
+github.com/AdguardTeam/dnsproxy v0.66.0 h1:RyUbyDxRSXBFjVG1l2/4HV3I98DtfIgpnZkgXkgHKnc=
-github.com/AdguardTeam/dnsproxy v0.65.2/go.mod h1:8NQTTNZY+qR9O1Fzgz3WQv30knfSgms68SRlzSnX74A=
+github.com/AdguardTeam/dnsproxy v0.66.0/go.mod h1:ZThEXbMUlP1RxfwtNW30ItPAHE6OF4YFygK8qjU/cvY=
 github.com/AdguardTeam/golibs v0.20.1 h1:ol8qLjWGZhU9paMMwN+OLWVTUigGsXa29iVTyd62VKY=
 github.com/AdguardTeam/golibs v0.20.1/go.mod h1:bgcMgRviCKyU6mkrX+RtT/OsKPFzyppelfRsksMG3KU=
 github.com/AdguardTeam/urlfilter v0.18.0 h1:ZZzwODC/ADpjJSODxySrrUnt/fvOCfGFaCW6j+wsGfQ=

internal/aghtest/aghtest.go

@@ -9,8 +9,13 @@ import (
 	"net/netip"
 	"net/url"
 	"testing"
+	"time"
 
+	"github.com/AdguardTeam/dnsproxy/proxy"
 	"github.com/AdguardTeam/golibs/log"
+	"github.com/AdguardTeam/golibs/netutil"
+	"github.com/AdguardTeam/golibs/testutil"
+	"github.com/miekg/dns"
 	"github.com/stretchr/testify/require"
 )
 
@@ -71,3 +76,49 @@ func StartHTTPServer(t testing.TB, data []byte) (c *http.Client, u *url.URL) {
 
 	return srv.Client(), u
 }
+
+// testTimeout is a timeout for tests.
+//
+// TODO(e.burkov):  Move into agdctest.
+const testTimeout = 1 * time.Second
+
+// StartLocalhostUpstream is a test helper that starts a DNS server on
+// localhost.
+func StartLocalhostUpstream(t *testing.T, h dns.Handler) (addr *url.URL) {
+	t.Helper()
+
+	startCh := make(chan netip.AddrPort)
+	defer close(startCh)
+	errCh := make(chan error)
+
+	srv := &dns.Server{
+		Addr:         "127.0.0.1:0",
+		Net:          string(proxy.ProtoTCP),
+		Handler:      h,
+		ReadTimeout:  testTimeout,
+		WriteTimeout: testTimeout,
+	}
+	srv.NotifyStartedFunc = func() {
+		addrPort := srv.Listener.Addr()
+		startCh <- netutil.NetAddrToAddrPort(addrPort)
+	}
+
+	go func() { errCh <- srv.ListenAndServe() }()
+
+	select {
+	case addrPort := <-startCh:
+		addr = &url.URL{
+			Scheme: string(proxy.ProtoTCP),
+			Host:   addrPort.String(),
+		}
+
+		testutil.CleanupAndRequireSuccess(t, func() (err error) { return <-errCh })
+		testutil.CleanupAndRequireSuccess(t, srv.Shutdown)
+	case err := <-errCh:
+		require.NoError(t, err)
+	case <-time.After(testTimeout):
+		require.FailNow(t, "timeout exceeded")
+	}
+
+	return addr
+}

internal/dnsforward/config.go

@@ -357,10 +357,6 @@ func (s *Server) newProxyConfig() (conf *proxy.Config, err error) {
 		conf.DNSCryptResolverCert = c.ResolverCert
 	}
 
-	if conf.UpstreamConfig == nil || len(conf.UpstreamConfig.Upstreams) == 0 {
-		return nil, errors.Error("no default upstream servers configured")
-	}
-
 	conf, err = prepareCacheConfig(conf,
 		srvConf.CacheSize,
 		srvConf.CacheMinTTL,

internal/dnsforward/dns64_test.go

@@ -8,7 +8,6 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
 	"github.com/AdguardTeam/dnsproxy/proxy"
-	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/miekg/dns"
@@ -101,21 +100,6 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 	type answerMap = map[uint16][sectionsNum][]dns.RR
 
 	pt := testutil.PanicT{}
-	newUps := func(answers answerMap) (u upstream.Upstream) {
-		return aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
-			q := req.Question[0]
-			require.Contains(pt, answers, q.Qtype)
-
-			answer := answers[q.Qtype]
-
-			resp = (&dns.Msg{}).SetReply(req)
-			resp.Answer = answer[sectionAnswer]
-			resp.Ns = answer[sectionAuthority]
-			resp.Extra = answer[sectionAdditional]
-
-			return resp, nil
-		})
-	}
 
 	testCases := []struct {
 		name    string
@@ -265,13 +249,16 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 	}}
 
 	localRR := newRR(t, ptr64Domain, dns.TypePTR, 3600, pointedDomain)
-	localUps := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
+	localUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, m *dns.Msg) {
-		require.Equal(pt, req.Question[0].Name, ptr64Domain)
+		require.Len(pt, m.Question, 1)
-		resp = (&dns.Msg{}).SetReply(req)
+		require.Equal(pt, m.Question[0].Name, ptr64Domain)
-		resp.Answer = []dns.RR{localRR}
+		resp := (&dns.Msg{
+			Answer: []dns.RR{localRR},
+		}).SetReply(m)
 
-		return resp, nil
+		require.NoError(t, w.WriteMsg(resp))
 	})
+	localUpsAddr := aghtest.StartLocalhostUpstream(t, localUpsHdlr).String()
 
 	client := &dns.Client{
 		Net:     "tcp",
@@ -279,10 +266,28 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		// TODO(e.burkov):  It seems [proxy.Proxy] isn't intended to be reused
+		tc := tc
-		// right after stop, due to a data race in [proxy.Proxy.Init] method
+		t.Run(tc.name, func(t *testing.T) {
-		// when setting an OOB size.  As a temporary workaround, recreate the
+			upsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		// whole server for each test case.
+				q := req.Question[0]
+				require.Contains(pt, tc.upsAns, q.Qtype)
+
+				answer := tc.upsAns[q.Qtype]
+
+				resp := (&dns.Msg{
+					Answer: answer[sectionAnswer],
+					Ns:     answer[sectionAuthority],
+					Extra:  answer[sectionAdditional],
+				}).SetReply(req)
+
+				require.NoError(pt, w.WriteMsg(resp))
+			})
+			upsAddr := aghtest.StartLocalhostUpstream(t, upsHdlr).String()
+
+			// TODO(e.burkov):  It seems [proxy.Proxy] isn't intended to be
+			// reused right after stop, due to a data race in [proxy.Proxy.Init]
+			// method when setting an OOB size.  As a temporary workaround,
+			// recreate the whole server for each test case.
 			s := createTestServer(t, &filtering.Config{
 				BlockingMode: filtering.BlockingModeDefault,
 			}, ServerConfig{
@@ -292,12 +297,13 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 				Config: Config{
 					UpstreamMode:     UpstreamModeLoadBalance,
 					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
+					UpstreamDNS:      []string{upsAddr},
 				},
+				UsePrivateRDNS:    true,
+				LocalPTRResolvers: []string{localUpsAddr},
 				ServePlainDNS:     true,
-		}, localUps)
+			})
 
-		t.Run(tc.name, func(t *testing.T) {
-			s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newUps(tc.upsAns)}
 			startDeferStop(t, s)
 
 			req := (&dns.Msg{}).SetQuestion(tc.qname, tc.qtype)

internal/dnsforward/dnsforward.go

@@ -464,7 +464,8 @@ func (s *Server) Start() error {
 // startLocked starts the DNS server without locking.  s.serverLock is expected
 // to be locked.
 func (s *Server) startLocked() error {
-	err := s.dnsProxy.Start()
+	// TODO(e.burkov):  Use context properly.
+	err := s.dnsProxy.Start(context.Background())
 	if err == nil {
 		s.isRunning = true
 	}
@@ -518,34 +519,30 @@ func (s *Server) prepareLocalResolvers(
 }
 
 // setupLocalResolvers initializes and sets the resolvers for local addresses.
-// It assumes s.serverLock is locked or s not running.
+// It assumes s.serverLock is locked or s not running.  It returns the upstream
-func (s *Server) setupLocalResolvers(boot upstream.Resolver) (err error) {
+// configuration used for private PTR resolving, or nil if it's disabled.  Note,
-	uc, err := s.prepareLocalResolvers(boot)
+// that it's safe to put nil into [proxy.Config.PrivateRDNSUpstreamConfig].
+func (s *Server) setupLocalResolvers(boot upstream.Resolver) (uc *proxy.UpstreamConfig, err error) {
+	if !s.conf.UsePrivateRDNS {
+		// It's safe to put nil into [proxy.Config.PrivateRDNSUpstreamConfig].
+		return nil, nil
+	}
+
+	uc, err = s.prepareLocalResolvers(boot)
 	if err != nil {
 		// Don't wrap the error because it's informative enough as is.
-		return err
+		return nil, err
 	}
 
-	s.localResolvers = &proxy.Proxy{
+	s.localResolvers, err = proxy.New(&proxy.Config{
-		Config: proxy.Config{
 		UpstreamConfig: uc,
-		},
+	})
-	}
-
-	err = s.localResolvers.Init()
 	if err != nil {
-		return fmt.Errorf("initializing proxy: %w", err)
+		return nil, fmt.Errorf("creating local resolvers: %w", err)
 	}
 
 	// TODO(e.burkov):  Should we also consider the DNS64 usage?
-	if s.conf.UsePrivateRDNS &&
+	return uc, nil
-		// Only set the upstream config if there are any upstreams.  It's safe
-		// to put nil into [proxy.Config.PrivateRDNSUpstreamConfig].
-		len(uc.Upstreams)+len(uc.DomainReservedUpstreams)+len(uc.SpecifiedDomainUpstreams) > 0 {
-		s.dnsProxy.PrivateRDNSUpstreamConfig = uc
-	}
-
-	return nil
 }
 
 // Prepare initializes parameters of s using data from conf.  conf must not be
@@ -586,21 +583,22 @@ func (s *Server) Prepare(conf *ServerConfig) (err error) {
 		return fmt.Errorf("preparing access: %w", err)
 	}
 
-	// Set the proxy here because [setupLocalResolvers] sets its values.
-	//
 	// TODO(e.burkov):  Remove once the local resolvers logic moved to dnsproxy.
-	s.dnsProxy = &proxy.Proxy{Config: *proxyConfig}
+	proxyConfig.PrivateRDNSUpstreamConfig, err = s.setupLocalResolvers(boot)
-
-	err = s.setupLocalResolvers(boot)
 	if err != nil {
 		return fmt.Errorf("setting up resolvers: %w", err)
 	}
 
-	err = s.setupFallbackDNS()
+	proxyConfig.Fallbacks, err = s.setupFallbackDNS()
 	if err != nil {
 		return fmt.Errorf("setting up fallback dns servers: %w", err)
 	}
 
+	s.dnsProxy, err = proxy.New(proxyConfig)
+	if err != nil {
+		return fmt.Errorf("creating proxy: %w", err)
+	}
+
 	s.recDetector.clear()
 
 	s.setupAddrProc()
@@ -643,26 +641,25 @@ func (s *Server) prepareInternalDNS() (boot upstream.Resolver, err error) {
 }
 
 // setupFallbackDNS initializes the fallback DNS servers.
-func (s *Server) setupFallbackDNS() (err error) {
+func (s *Server) setupFallbackDNS() (uc *proxy.UpstreamConfig, err error) {
 	fallbacks := s.conf.FallbackDNS
 	fallbacks = stringutil.FilterOut(fallbacks, IsCommentOrEmpty)
 	if len(fallbacks) == 0 {
-		return nil
+		return nil, nil
 	}
 
-	uc, err := proxy.ParseUpstreamsConfig(fallbacks, &upstream.Options{
+	uc, err = proxy.ParseUpstreamsConfig(fallbacks, &upstream.Options{
 		// TODO(s.chzhen):  Investigate if other options are needed.
 		Timeout:    s.conf.UpstreamTimeout,
 		PreferIPv6: s.conf.BootstrapPreferIPv6,
+		// TODO(e.burkov):  Use bootstrap.
 	})
 	if err != nil {
 		// Do not wrap the error because it's informative enough as is.
-		return err
+		return nil, err
 	}
 
-	s.dnsProxy.Fallbacks = uc
+	return uc, nil
-
-	return nil
 }
 
 // setupAddrProc initializes the address processor.  It assumes s.serverLock is
@@ -730,21 +727,11 @@ func (s *Server) prepareInternalProxy() (err error) {
 		return fmt.Errorf("invalid upstream mode: %w", err)
 	}
 
-	// TODO(a.garipov): Make a proper constructor for proxy.Proxy.
+	s.internalProxy, err = proxy.New(conf)
-	p := &proxy.Proxy{
-		Config: *conf,
-	}
 
-	err = p.Init()
-	if err != nil {
 	return err
 }
 
-	s.internalProxy = p
-
-	return nil
-}
-
 // Stop stops the DNS server.
 func (s *Server) Stop() error {
 	s.serverLock.Lock()
@@ -761,14 +748,17 @@ func (s *Server) stopLocked() (err error) {
 	// [upstream.Upstream] implementations.
 
 	if s.dnsProxy != nil {
-		err = s.dnsProxy.Stop()
+		// TODO(e.burkov):  Use context properly.
+		err = s.dnsProxy.Shutdown(context.Background())
 		if err != nil {
 			log.Error("dnsforward: closing primary resolvers: %s", err)
 		}
 	}
 
 	logCloserErr(s.internalProxy.UpstreamConfig, "dnsforward: closing internal resolvers: %s")
+	if s.localResolvers != nil {
 		logCloserErr(s.localResolvers.UpstreamConfig, "dnsforward: closing local resolvers: %s")
+	}
 
 	for _, b := range s.bootResolvers {
 		logCloserErr(b, "dnsforward: closing bootstrap %s: %s", b.Address())

internal/dnsforward/dnsforward_test.go

@@ -5,9 +5,11 @@ import (
 	"crypto/ecdsa"
 	"crypto/rand"
 	"crypto/rsa"
+	"crypto/sha256"
 	"crypto/tls"
 	"crypto/x509"
 	"crypto/x509/pkix"
+	"encoding/hex"
 	"encoding/pem"
 	"fmt"
 	"math/big"
@@ -63,8 +65,7 @@ func startDeferStop(t *testing.T, s *Server) {
 	t.Helper()
 
 	err := s.Start()
-	require.NoErrorf(t, err, "failed to start server: %s", err)
+	require.NoError(t, err)
-
 	testutil.CleanupAndRequireSuccess(t, s.Stop)
 }
 
@@ -72,7 +73,6 @@ func createTestServer(
 	t *testing.T,
 	filterConf *filtering.Config,
 	forwardConf ServerConfig,
-	localUps upstream.Upstream,
 ) (s *Server) {
 	t.Helper()
 
@@ -82,7 +82,8 @@ func createTestServer(
 @@||whitelist.example.org^
 ||127.0.0.255`
 	filters := []filtering.Filter{{
-		ID: 0, Data: []byte(rules),
+		ID:   0,
+		Data: []byte(rules),
 	}}
 
 	f, err := filtering.New(filterConf, filters)
@@ -105,19 +106,6 @@ func createTestServer(
 	err = s.Prepare(&forwardConf)
 	require.NoError(t, err)
 
-	s.serverLock.Lock()
-	defer s.serverLock.Unlock()
-
-	// TODO(e.burkov):  Try to move it higher.
-	if localUps != nil {
-		ups := []upstream.Upstream{localUps}
-		s.localResolvers.UpstreamConfig.Upstreams = ups
-		s.conf.UsePrivateRDNS = true
-		s.dnsProxy.PrivateRDNSUpstreamConfig = &proxy.UpstreamConfig{
-			Upstreams: ups,
-		}
-	}
-
 	return s
 }
 
@@ -181,7 +169,7 @@ func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte)
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 
 	tlsConf.CertificateChainData, tlsConf.PrivateKeyData = certPem, keyPem
 	s.conf.TLSConfig = tlsConf
@@ -310,7 +298,7 @@ func TestServer(t *testing.T) {
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
 	startDeferStop(t, s)
 
@@ -410,7 +398,7 @@ func TestServerWithProtectionDisabled(t *testing.T) {
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
 	startDeferStop(t, s)
 
@@ -490,7 +478,7 @@ func TestServerRace(t *testing.T) {
 		ConfigModified: func() {},
 		ServePlainDNS:  true,
 	}
-	s := createTestServer(t, filterConf, forwardConf, nil)
+	s := createTestServer(t, filterConf, forwardConf)
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{newGoogleUpstream()}
 	startDeferStop(t, s)
 
@@ -545,7 +533,7 @@ func TestSafeSearch(t *testing.T) {
 		},
 		ServePlainDNS: true,
 	}
-	s := createTestServer(t, filterConf, forwardConf, nil)
+	s := createTestServer(t, filterConf, forwardConf)
 	startDeferStop(t, s)
 
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
@@ -628,7 +616,7 @@ func TestInvalidRequest(t *testing.T) {
 			},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 	startDeferStop(t, s)
 
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
@@ -662,7 +650,7 @@ func TestBlockedRequest(t *testing.T) {
 	s := createTestServer(t, &filtering.Config{
 		ProtectionEnabled: true,
 		BlockingMode:      filtering.BlockingModeDefault,
-	}, forwardConf, nil)
+	}, forwardConf)
 	startDeferStop(t, s)
 
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP)
@@ -698,7 +686,7 @@ func TestServerCustomClientUpstream(t *testing.T) {
 	}
 	s := createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
-	}, forwardConf, nil)
+	}, forwardConf)
 
 	ups := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
 		atomic.AddUint32(&upsCalledCounter, 1)
@@ -773,7 +761,7 @@ func TestBlockCNAMEProtectionEnabled(t *testing.T) {
 			},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 	testUpstm := &aghtest.Upstream{
 		CName: testCNAMEs,
 		IPv4:  testIPv4,
@@ -811,7 +799,7 @@ func TestBlockCNAME(t *testing.T) {
 	s := createTestServer(t, &filtering.Config{
 		ProtectionEnabled: true,
 		BlockingMode:      filtering.BlockingModeDefault,
-	}, forwardConf, nil)
+	}, forwardConf)
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
 		&aghtest.Upstream{
 			CName: testCNAMEs,
@@ -886,7 +874,7 @@ func TestClientRulesForCNAMEMatching(t *testing.T) {
 	}
 	s := createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
-	}, forwardConf, nil)
+	}, forwardConf)
 	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
 		&aghtest.Upstream{
 			CName: testCNAMEs,
@@ -933,7 +921,7 @@ func TestNullBlockedRequest(t *testing.T) {
 	s := createTestServer(t, &filtering.Config{
 		ProtectionEnabled: true,
 		BlockingMode:      filtering.BlockingModeNullIP,
-	}, forwardConf, nil)
+	}, forwardConf)
 	startDeferStop(t, s)
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP)
 
@@ -1054,7 +1042,7 @@ func TestBlockedByHosts(t *testing.T) {
 	s := createTestServer(t, &filtering.Config{
 		ProtectionEnabled: true,
 		BlockingMode:      filtering.BlockingModeDefault,
-	}, forwardConf, nil)
+	}, forwardConf)
 	startDeferStop(t, s)
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP)
 
@@ -1102,7 +1090,7 @@ func TestBlockedBySafeBrowsing(t *testing.T) {
 		},
 		ServePlainDNS: true,
 	}
-	s := createTestServer(t, filterConf, forwardConf, nil)
+	s := createTestServer(t, filterConf, forwardConf)
 	startDeferStop(t, s)
 	addr := s.dnsProxy.Addr(proxy.ProtoUDP)
 
@@ -1482,6 +1470,8 @@ func TestServer_Exchange(t *testing.T) {
 		onesIP  = netip.MustParseAddr("1.1.1.1")
 		twosIP  = netip.MustParseAddr("2.2.2.2")
 		localIP = netip.MustParseAddr("192.168.1.1")
+
+		pt = testutil.PanicT{}
 	)
 
 	onesRevExtIPv4, err := netutil.IPToReversedAddr(onesIP.AsSlice())
@@ -1490,72 +1480,73 @@ func TestServer_Exchange(t *testing.T) {
 	twosRevExtIPv4, err := netutil.IPToReversedAddr(twosIP.AsSlice())
 	require.NoError(t, err)
 
-	extUpstream := &aghtest.UpstreamMock{
+	extUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		OnAddress: func() (addr string) { return "external.upstream.example" },
+		resp := aghalg.Coalesce(
-		OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
+			aghtest.MatchedResponse(req, dns.TypePTR, onesRevExtIPv4, dns.Fqdn(onesHost)),
-			return aghalg.Coalesce(
+			doubleTTL(aghtest.MatchedResponse(req, dns.TypePTR, twosRevExtIPv4, dns.Fqdn(twosHost))),
-				aghtest.MatchedResponse(req, dns.TypePTR, onesRevExtIPv4, onesHost),
-				doubleTTL(aghtest.MatchedResponse(req, dns.TypePTR, twosRevExtIPv4, twosHost)),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
-			), nil
+		)
-		},
+
-	}
+		require.NoError(pt, w.WriteMsg(resp))
+	})
+	upsAddr := aghtest.StartLocalhostUpstream(t, extUpsHdlr).String()
 
 	revLocIPv4, err := netutil.IPToReversedAddr(localIP.AsSlice())
 	require.NoError(t, err)
 
-	locUpstream := &aghtest.UpstreamMock{
+	locUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		OnAddress: func() (addr string) { return "local.upstream.example" },
+		resp := aghalg.Coalesce(
-		OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
+			aghtest.MatchedResponse(req, dns.TypePTR, revLocIPv4, dns.Fqdn(localDomainHost)),
-			return aghalg.Coalesce(
-				aghtest.MatchedResponse(req, dns.TypePTR, revLocIPv4, localDomainHost),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
-			), nil
+		)
-		},
-	}
 
-	errUpstream := aghtest.NewErrorUpstream()
+		require.NoError(pt, w.WriteMsg(resp))
-	nonPtrUpstream := aghtest.NewBlockUpstream("some-host", true)
-	refusingUpstream := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
-		return new(dns.Msg).SetRcode(req, dns.RcodeRefused), nil
 	})
-	zeroTTLUps := &aghtest.UpstreamMock{
+
-		OnAddress: func() (addr string) { return "zero.ttl.example" },
+	errUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
+		require.NoError(pt, w.WriteMsg(new(dns.Msg).SetRcode(req, dns.RcodeServerFailure)))
-			resp = new(dns.Msg).SetReply(req)
+	})
-			hdr := dns.RR_Header{
+
+	nonPtrHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		hash := sha256.Sum256([]byte("some-host"))
+		resp := (&dns.Msg{
+			Answer: []dns.RR{&dns.TXT{
+				Hdr: dns.RR_Header{
+					Name:   req.Question[0].Name,
+					Rrtype: dns.TypeTXT,
+					Class:  dns.ClassINET,
+					Ttl:    60,
+				},
+				Txt: []string{hex.EncodeToString(hash[:])},
+			}},
+		}).SetReply(req)
+
+		require.NoError(pt, w.WriteMsg(resp))
+	})
+	refusingHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		require.NoError(pt, w.WriteMsg(new(dns.Msg).SetRcode(req, dns.RcodeRefused)))
+	})
+
+	zeroTTLHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		resp := (&dns.Msg{
+			Answer: []dns.RR{&dns.PTR{
+				Hdr: dns.RR_Header{
 					Name:   req.Question[0].Name,
 					Rrtype: dns.TypePTR,
 					Class:  dns.ClassINET,
 					Ttl:    0,
-			}
+				},
-			resp.Answer = []dns.RR{&dns.PTR{
+				Ptr: dns.Fqdn(localDomainHost),
-				Hdr: hdr,
+			}},
-				Ptr: localDomainHost,
+		}).SetReply(req)
-			}}
 
-			return resp, nil
+		require.NoError(pt, w.WriteMsg(resp))
-		},
+	})
-	}
-
-	srv := &Server{
-		recDetector: newRecursionDetector(0, 1),
-		internalProxy: &proxy.Proxy{
-			Config: proxy.Config{
-				UpstreamConfig: &proxy.UpstreamConfig{
-					Upstreams: []upstream.Upstream{extUpstream},
-				},
-			},
-		},
-	}
-	srv.conf.UsePrivateRDNS = true
-	srv.privateNets = netutil.SubnetSetFunc(netutil.IsLocallyServed)
-	require.NoError(t, srv.internalProxy.Init())
 
 	testCases := []struct {
 		req         netip.Addr
 		wantErr     error
-		locUpstream upstream.Upstream
+		locUpstream dns.Handler
 		name        string
 		want        string
 		wantTTL     time.Duration
@@ -1570,35 +1561,35 @@ func TestServer_Exchange(t *testing.T) {
 		name:        "local_good",
 		want:        localDomainHost,
 		wantErr:     nil,
-		locUpstream: locUpstream,
+		locUpstream: locUpsHdlr,
 		req:         localIP,
 		wantTTL:     defaultTTL,
 	}, {
 		name:        "upstream_error",
 		want:        "",
-		wantErr:     aghtest.ErrUpstream,
+		wantErr:     ErrRDNSFailed,
-		locUpstream: errUpstream,
+		locUpstream: errUpsHdlr,
 		req:         localIP,
 		wantTTL:     0,
 	}, {
 		name:        "empty_answer_error",
 		want:        "",
 		wantErr:     ErrRDNSNoData,
-		locUpstream: locUpstream,
+		locUpstream: locUpsHdlr,
 		req:         netip.MustParseAddr("192.168.1.2"),
 		wantTTL:     0,
 	}, {
 		name:        "invalid_answer",
 		want:        "",
 		wantErr:     ErrRDNSNoData,
-		locUpstream: nonPtrUpstream,
+		locUpstream: nonPtrHdlr,
 		req:         localIP,
 		wantTTL:     0,
 	}, {
 		name:        "refused",
 		want:        "",
 		wantErr:     ErrRDNSFailed,
-		locUpstream: refusingUpstream,
+		locUpstream: refusingHdlr,
 		req:         localIP,
 		wantTTL:     0,
 	}, {
@@ -1612,23 +1603,28 @@ func TestServer_Exchange(t *testing.T) {
 		name:        "zero_ttl",
 		want:        localDomainHost,
 		wantErr:     nil,
-		locUpstream: zeroTTLUps,
+		locUpstream: zeroTTLHdlr,
 		req:         localIP,
 		wantTTL:     0,
 	}}
 
 	for _, tc := range testCases {
-		pcfg := proxy.Config{
+		localUpsAddr := aghtest.StartLocalhostUpstream(t, tc.locUpstream).String()
-			UpstreamConfig: &proxy.UpstreamConfig{
-				Upstreams: []upstream.Upstream{tc.locUpstream},
-			},
-		}
-		srv.localResolvers = &proxy.Proxy{
-			Config: pcfg,
-		}
-		require.NoError(t, srv.localResolvers.Init())
 
 		t.Run(tc.name, func(t *testing.T) {
+			srv := createTestServer(t, &filtering.Config{
+				BlockingMode: filtering.BlockingModeDefault,
+			}, ServerConfig{
+				Config: Config{
+					UpstreamDNS:      []string{upsAddr},
+					UpstreamMode:     UpstreamModeLoadBalance,
+					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
+				},
+				LocalPTRResolvers: []string{localUpsAddr},
+				UsePrivateRDNS:    true,
+				ServePlainDNS:     true,
+			})
+
 			host, ttl, eerr := srv.Exchange(tc.req)
 
 			require.ErrorIs(t, eerr, tc.wantErr)
@@ -1638,8 +1634,17 @@ func TestServer_Exchange(t *testing.T) {
 	}
 
 	t.Run("resolving_disabled", func(t *testing.T) {
-		srv.conf.UsePrivateRDNS = false
+		srv := createTestServer(t, &filtering.Config{
-		t.Cleanup(func() { srv.conf.UsePrivateRDNS = true })
+			BlockingMode: filtering.BlockingModeDefault,
+		}, ServerConfig{
+			Config: Config{
+				UpstreamDNS:      []string{upsAddr},
+				UpstreamMode:     UpstreamModeLoadBalance,
+				EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
+			},
+			LocalPTRResolvers: []string{},
+			ServePlainDNS:     true,
+		})
 
 		host, _, eerr := srv.Exchange(localIP)
 

internal/dnsforward/dnsrewrite_test.go

@@ -42,7 +42,7 @@ func TestServer_FilterDNSRewrite(t *testing.T) {
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 
 	makeQ := func(qtype rules.RRType) (req *dns.Msg) {
 		return &dns.Msg{

internal/dnsforward/http_test.go

@@ -83,7 +83,7 @@ func TestDNSForwardHTTP_handleGetConfig(t *testing.T) {
 		ConfigModified: func() {},
 		ServePlainDNS:  true,
 	}
-	s := createTestServer(t, filterConf, forwardConf, nil)
+	s := createTestServer(t, filterConf, forwardConf)
 	s.sysResolvers = &emptySysResolvers{}
 
 	require.NoError(t, s.Start())
@@ -164,7 +164,7 @@ func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
 		ConfigModified: func() {},
 		ServePlainDNS:  true,
 	}
-	s := createTestServer(t, filterConf, forwardConf, nil)
+	s := createTestServer(t, filterConf, forwardConf)
 	s.sysResolvers = &emptySysResolvers{}
 
 	defaultConf := s.conf
@@ -439,7 +439,7 @@ func TestServer_HandleTestUpstreamDNS(t *testing.T) {
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 	srv.etcHosts = upstream.NewHostsResolver(hc)
 	startDeferStop(t, srv)
 

internal/dnsforward/process_internal_test.go

@@ -9,7 +9,6 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
 	"github.com/AdguardTeam/dnsproxy/proxy"
-	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/AdguardTeam/urlfilter/rules"
@@ -87,7 +86,7 @@ func TestServer_ProcessInitial(t *testing.T) {
 
 			s := createTestServer(t, &filtering.Config{
 				BlockingMode: filtering.BlockingModeDefault,
-			}, c, nil)
+			}, c)
 
 			var gotAddr netip.Addr
 			s.addrProc = &aghtest.AddressProcessor{
@@ -188,7 +187,7 @@ func TestServer_ProcessFilteringAfterResponse(t *testing.T) {
 
 			s := createTestServer(t, &filtering.Config{
 				BlockingMode: filtering.BlockingModeDefault,
-			}, c, nil)
+			}, c)
 
 			resp := newResp(dns.RcodeSuccess, tc.req, tc.respAns)
 			dctx := &dnsContext{
@@ -248,9 +247,9 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host       string
 		want       []*dns.SVCB
 		wantRes    resultCode
-		portDoH    int
+		addrsDoH   []*net.TCPAddr
-		portDoT    int
+		addrsDoT   []*net.TCPAddr
-		portDoQ    int
+		addrsDoQ   []*net.UDPAddr
 		qtype      uint16
 		ddrEnabled bool
 	}{{
@@ -259,14 +258,14 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       testQuestionTarget,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: true,
-		portDoH:    8043,
+		addrsDoH:   []*net.TCPAddr{{Port: 8043}},
 	}, {
 		name:       "pass_qtype",
 		wantRes:    resultCodeFinish,
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeA,
 		ddrEnabled: true,
-		portDoH:    8043,
+		addrsDoH:   []*net.TCPAddr{{Port: 8043}},
 	}, {
 		name:       "pass_disabled_tls",
 		wantRes:    resultCodeFinish,
@@ -279,7 +278,7 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: false,
-		portDoH:    8043,
+		addrsDoH:   []*net.TCPAddr{{Port: 8043}},
 	}, {
 		name:       "dot",
 		wantRes:    resultCodeFinish,
@@ -287,7 +286,7 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: true,
-		portDoT:    8043,
+		addrsDoT:   []*net.TCPAddr{{Port: 8043}},
 	}, {
 		name:       "doh",
 		wantRes:    resultCodeFinish,
@@ -295,7 +294,7 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: true,
-		portDoH:    8044,
+		addrsDoH:   []*net.TCPAddr{{Port: 8044}},
 	}, {
 		name:       "doq",
 		wantRes:    resultCodeFinish,
@@ -303,7 +302,7 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: true,
-		portDoQ:    8042,
+		addrsDoQ:   []*net.UDPAddr{{Port: 8042}},
 	}, {
 		name:       "dot_doh",
 		wantRes:    resultCodeFinish,
@@ -311,13 +310,35 @@ func TestServer_ProcessDDRQuery(t *testing.T) {
 		host:       ddrHostFQDN,
 		qtype:      dns.TypeSVCB,
 		ddrEnabled: true,
-		portDoT:    8043,
+		addrsDoT:   []*net.TCPAddr{{Port: 8043}},
-		portDoH:    8044,
+		addrsDoH:   []*net.TCPAddr{{Port: 8044}},
 	}}
 
+	_, certPem, keyPem := createServerTLSConfig(t)
+
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			s := prepareTestServer(t, tc.portDoH, tc.portDoT, tc.portDoQ, tc.ddrEnabled)
+			s := createTestServer(t, &filtering.Config{
+				BlockingMode: filtering.BlockingModeDefault,
+			}, ServerConfig{
+				Config: Config{
+					HandleDDR:        tc.ddrEnabled,
+					UpstreamMode:     UpstreamModeLoadBalance,
+					EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
+				},
+				TLSConfig: TLSConfig{
+					ServerName:           ddrTestDomainName,
+					CertificateChainData: certPem,
+					PrivateKeyData:       keyPem,
+					TLSListenAddrs:       tc.addrsDoT,
+					HTTPSListenAddrs:     tc.addrsDoH,
+					QUICListenAddrs:      tc.addrsDoQ,
+				},
+				ServePlainDNS: true,
+			})
+			// TODO(e.burkov):  Generate a certificate actually containing the
+			// IP addresses.
+			s.conf.hasIPAddrs = true
 
 			req := createTestMessageWithType(tc.host, tc.qtype)
 
@@ -358,41 +379,6 @@ func createTestDNSFilter(t *testing.T) (f *filtering.DNSFilter) {
 	return f
 }
 
-func prepareTestServer(t *testing.T, portDoH, portDoT, portDoQ int, ddrEnabled bool) (s *Server) {
-	t.Helper()
-
-	s = &Server{
-		dnsFilter: createTestDNSFilter(t),
-		dnsProxy: &proxy.Proxy{
-			Config: proxy.Config{},
-		},
-		conf: ServerConfig{
-			Config: Config{
-				HandleDDR: ddrEnabled,
-			},
-			TLSConfig: TLSConfig{
-				ServerName: ddrTestDomainName,
-			},
-			ServePlainDNS: true,
-		},
-	}
-
-	if portDoT > 0 {
-		s.dnsProxy.TLSListenAddr = []*net.TCPAddr{{Port: portDoT}}
-		s.conf.hasIPAddrs = true
-	}
-
-	if portDoQ > 0 {
-		s.dnsProxy.QUICListenAddr = []*net.UDPAddr{{Port: portDoQ}}
-	}
-
-	if portDoH > 0 {
-		s.conf.HTTPSListenAddrs = []*net.TCPAddr{{Port: portDoH}}
-	}
-
-	return s
-}
-
 func TestServer_ProcessDetermineLocal(t *testing.T) {
 	s := &Server{
 		privateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
@@ -680,13 +666,16 @@ func TestServer_ProcessRestrictLocal(t *testing.T) {
 		intPTRAnswer   = "some.local-client."
 	)
 
-	ups := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
+	localUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		return aghalg.Coalesce(
+		resp := aghalg.Coalesce(
 			aghtest.MatchedResponse(req, dns.TypePTR, extPTRQuestion, extPTRAnswer),
 			aghtest.MatchedResponse(req, dns.TypePTR, intPTRQuestion, intPTRAnswer),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
-		), nil
+		)
+
+		require.NoError(testutil.PanicT{}, w.WriteMsg(resp))
 	})
+	localUpsAddr := aghtest.StartLocalhostUpstream(t, localUpsHdlr).String()
 
 	s := createTestServer(t, &filtering.Config{
 		BlockingMode: filtering.BlockingModeDefault,
@@ -696,12 +685,14 @@ func TestServer_ProcessRestrictLocal(t *testing.T) {
 		// TODO(s.chzhen):  Add tests where EDNSClientSubnet.Enabled is true.
 		// Improve Config declaration for tests.
 		Config: Config{
+			UpstreamDNS:      []string{localUpsAddr},
 			UpstreamMode:     UpstreamModeLoadBalance,
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
+		UsePrivateRDNS:    true,
+		LocalPTRResolvers: []string{localUpsAddr},
 		ServePlainDNS:     true,
-	}, ups)
+	})
-	s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{ups}
 	startDeferStop(t, s)
 
 	testCases := []struct {
@@ -764,6 +755,16 @@ func TestServer_ProcessLocalPTR_usingResolvers(t *testing.T) {
 	const locDomain = "some.local."
 	const reqAddr = "1.1.168.192.in-addr.arpa."
 
+	localUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
+		resp := aghalg.Coalesce(
+			aghtest.MatchedResponse(req, dns.TypePTR, reqAddr, locDomain),
+			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
+		)
+
+		require.NoError(testutil.PanicT{}, w.WriteMsg(resp))
+	})
+	localUpsAddr := aghtest.StartLocalhostUpstream(t, localUpsHdlr).String()
+
 	s := createTestServer(
 		t,
 		&filtering.Config{
@@ -776,14 +777,10 @@ func TestServer_ProcessLocalPTR_usingResolvers(t *testing.T) {
 				UpstreamMode:     UpstreamModeLoadBalance,
 				EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 			},
+			UsePrivateRDNS:    true,
+			LocalPTRResolvers: []string{localUpsAddr},
 			ServePlainDNS:     true,
 		},
-		aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
-			return aghalg.Coalesce(
-				aghtest.MatchedResponse(req, dns.TypePTR, reqAddr, locDomain),
-				new(dns.Msg).SetRcode(req, dns.RcodeNameError),
-			), nil
-		}),
 	)
 
 	var proxyCtx *proxy.DNSContext

internal/dnsforward/svcbmsg_test.go

@@ -21,7 +21,7 @@ func TestGenAnswerHTTPS_andSVCB(t *testing.T) {
 			EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
 		},
 		ServePlainDNS: true,
-	}, nil)
+	})
 
 	req := &dns.Msg{
 		Question: []dns.Question{{

internal/next/dnssvc/dnssvc.go

@@ -67,8 +67,7 @@ func New(c *Config) (svc *Service, err error) {
 	}
 
 	svc.bootstrapResolvers = resolvers
-	svc.proxy = &proxy.Proxy{
+	svc.proxy, err = proxy.New(&proxy.Config{
-		Config: proxy.Config{
 		UDPListenAddr: udpAddrs(c.Addresses),
 		TCPListenAddr: tcpAddrs(c.Addresses),
 		UpstreamConfig: &proxy.UpstreamConfig{
@@ -76,10 +75,7 @@ func New(c *Config) (svc *Service, err error) {
 		},
 		UseDNS64:   c.UseDNS64,
 		DNS64Prefs: c.DNS64Prefixes,
-		},
+	})
-	}
-
-	err = svc.proxy.Init()
 	if err != nil {
 		return nil, fmt.Errorf("proxy: %w", err)
 	}
@@ -174,7 +170,7 @@ func (svc *Service) Start() (err error) {
 		svc.running.Store(err == nil)
 	}()
 
-	return svc.proxy.Start()
+	return svc.proxy.Start(context.Background())
 }
 
 // Shutdown implements the [agh.Service] interface for *Service.  svc may be
@@ -185,7 +181,7 @@ func (svc *Service) Shutdown(ctx context.Context) (err error) {
 	}
 
 	errs := []error{
-		svc.proxy.Stop(),
+		svc.proxy.Shutdown(ctx),
 	}
 
 	for _, b := range svc.bootstrapResolvers {