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Pull request 1878: AG-22597-imp-rdns
Squashed commit of the following: commit ccad155c34989943d88a0a260c50845d1f4ece6b Merge: 0cd889f6a5a195b441Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Jul 6 17:00:58 2023 +0300 Merge branch 'master' into AG-22597-imp-rdns commit 0cd889f6a500f5616af0f8d8fdcde0403b87ad4f Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Jul 6 12:20:49 2023 +0300 dnsforward: imp code commit 1aaa1998b914b0d53142c21fa3bdcae502e4f3f6 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Tue Jul 4 20:11:55 2023 +0300 home: add todo commit aed232fcf70ef546f373d5235b73abcb4fbb4b6c Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Tue Jul 4 13:25:28 2023 +0300 all: imp code, tests commit 5c028c2766ffb8ebdc358a245a249c6a55d9ad81 Merge: 83d6ae7f697af062f7Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Mon Jul 3 18:54:42 2023 +0300 Merge branch 'master' into AG-22597-imp-rdns commit 83d6ae7f61a7b81a8d73cd6d747035278c64fb70 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Mon Jul 3 18:53:05 2023 +0300 home: imp code commit 8153988dece0406e51a90a43eaffae59dba30a36 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Fri Jun 30 18:06:09 2023 +0300 all: imp code commit 00d3cc11a9378318f176aae00ddf972f255d575c Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Fri Jun 30 13:05:04 2023 +0300 all: add tests commit ffdc95f237bfdb780922b4390d82cdc0154b0621 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Jun 29 15:20:00 2023 +0300 all: imp code, docs commit 0dc60e2b355750ca701558927d22fb9ad187ea7e Merge: 69dd56bdbd4a4bda64Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Thu Jun 29 15:13:19 2023 +0300 Merge branch 'master' into AG-22597-imp-rdns commit 69dd56bdb75056b0fa6bcf6538af7fff93383323 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Fri Jun 23 14:36:29 2023 +0300 rdns: add tests commit 16909b51adbe3a3f230291834cc9486dd8a0e8f8 Author: Stanislav Chzhen <s.chzhen@adguard.com> Date: Mon Jun 19 16:28:26 2023 +0300 rdns: extract rdns
This commit is contained in:
Stanislav Chzhen
parent
5a195b441c
commit
c21f958eaf
9 changed files with 389 additions and 458 deletions
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@ -17,6 +17,7 @@ import (
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"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/AdGuardHome/internal/querylog"
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"github.com/AdguardTeam/AdGuardHome/internal/rdns"
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"github.com/AdguardTeam/AdGuardHome/internal/stats"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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@ -277,17 +278,6 @@ func (s *Server) Resolve(host string) ([]net.IPAddr, error) {
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return s.internalProxy.LookupIPAddr(host)
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}
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// RDNSExchanger is a resolver for clients' addresses.
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type RDNSExchanger interface {
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// Exchange tries to resolve the ip in a suitable way, i.e. either as local
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// or as external.
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Exchange(ip net.IP) (host string, err error)
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// ResolvesPrivatePTR returns true if the RDNSExchanger is able to
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// resolve PTR requests for locally-served addresses.
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ResolvesPrivatePTR() (ok bool)
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}
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const (
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// ErrRDNSNoData is returned by [RDNSExchanger.Exchange] when the answer
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// section of response is either NODATA or has no PTR records.
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@ -299,10 +289,10 @@ const (
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)
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// type check
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var _ RDNSExchanger = (*Server)(nil)
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var _ rdns.Exchanger = (*Server)(nil)
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// Exchange implements the RDNSExchanger interface for *Server.
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func (s *Server) Exchange(ip net.IP) (host string, err error) {
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// Exchange implements the [rdns.Exchanger] interface for *Server.
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func (s *Server) Exchange(ip netip.Addr) (host string, err error) {
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s.serverLock.RLock()
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defer s.serverLock.RUnlock()
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@ -310,7 +300,7 @@ func (s *Server) Exchange(ip net.IP) (host string, err error) {
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return "", nil
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}
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arpa, err := netutil.IPToReversedAddr(ip)
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arpa, err := netutil.IPToReversedAddr(ip.AsSlice())
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if err != nil {
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return "", fmt.Errorf("reversing ip: %w", err)
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}
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@ -335,7 +325,7 @@ func (s *Server) Exchange(ip net.IP) (host string, err error) {
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}
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var resolver *proxy.Proxy
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if s.privateNets.Contains(ip) {
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if s.isPrivateIP(ip) {
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if !s.conf.UsePrivateRDNS {
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return "", nil
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}
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@ -350,8 +340,12 @@ func (s *Server) Exchange(ip net.IP) (host string, err error) {
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return "", err
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}
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return hostFromPTR(ctx.Res)
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}
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// hostFromPTR returns domain name from the PTR response or error.
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func hostFromPTR(resp *dns.Msg) (host string, err error) {
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// Distinguish between NODATA response and a failed request.
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resp := ctx.Res
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if resp.Rcode != dns.RcodeSuccess && resp.Rcode != dns.RcodeNameError {
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return "", fmt.Errorf(
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"received %s response: %w",
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@ -370,12 +364,25 @@ func (s *Server) Exchange(ip net.IP) (host string, err error) {
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return "", ErrRDNSNoData
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}
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// ResolvesPrivatePTR implements the RDNSExchanger interface for *Server.
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func (s *Server) ResolvesPrivatePTR() (ok bool) {
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// isPrivateIP returns true if the ip is private.
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func (s *Server) isPrivateIP(ip netip.Addr) (ok bool) {
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return s.privateNets.Contains(ip.AsSlice())
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}
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// ShouldResolveClient returns false if ip is a loopback address, or ip is
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// private and resolving of private addresses is disabled.
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func (s *Server) ShouldResolveClient(ip netip.Addr) (ok bool) {
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if ip.IsLoopback() {
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return false
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}
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isPrivate := s.isPrivateIP(ip)
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s.serverLock.RLock()
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defer s.serverLock.RUnlock()
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return s.conf.UsePrivateRDNS
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return s.conf.ResolveClients &&
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(s.conf.UsePrivateRDNS || !isPrivate)
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}
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// Start starts the DNS server.
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@ -1273,11 +1273,11 @@ func TestServer_Exchange(t *testing.T) {
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)
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var (
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onesIP = net.IP{1, 1, 1, 1}
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localIP = net.IP{192, 168, 1, 1}
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onesIP = netip.MustParseAddr("1.1.1.1")
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localIP = netip.MustParseAddr("192.168.1.1")
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)
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revExtIPv4, err := netutil.IPToReversedAddr(onesIP)
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revExtIPv4, err := netutil.IPToReversedAddr(onesIP.AsSlice())
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require.NoError(t, err)
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extUpstream := &aghtest.UpstreamMock{
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@ -1290,7 +1290,7 @@ func TestServer_Exchange(t *testing.T) {
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},
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}
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revLocIPv4, err := netutil.IPToReversedAddr(localIP)
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revLocIPv4, err := netutil.IPToReversedAddr(localIP.AsSlice())
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require.NoError(t, err)
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locUpstream := &aghtest.UpstreamMock{
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@ -1330,7 +1330,7 @@ func TestServer_Exchange(t *testing.T) {
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want string
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wantErr error
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locUpstream upstream.Upstream
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req net.IP
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req netip.Addr
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}{{
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name: "external_good",
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want: onesHost,
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@ -1354,7 +1354,7 @@ func TestServer_Exchange(t *testing.T) {
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want: "",
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wantErr: ErrRDNSNoData,
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locUpstream: locUpstream,
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req: net.IP{192, 168, 1, 2},
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req: netip.MustParseAddr("192.168.1.2"),
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}, {
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name: "invalid_answer",
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want: "",
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@ -1396,3 +1396,57 @@ func TestServer_Exchange(t *testing.T) {
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assert.Empty(t, host)
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})
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}
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func TestServer_ShouldResolveClient(t *testing.T) {
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srv := &Server{
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privateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
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}
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testCases := []struct {
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ip netip.Addr
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want require.BoolAssertionFunc
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name string
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resolve bool
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usePrivate bool
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}{{
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name: "default",
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ip: netip.MustParseAddr("1.1.1.1"),
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want: require.True,
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resolve: true,
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usePrivate: true,
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}, {
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name: "no_rdns",
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ip: netip.MustParseAddr("1.1.1.1"),
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want: require.False,
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resolve: false,
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usePrivate: true,
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}, {
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name: "loopback",
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ip: netip.MustParseAddr("127.0.0.1"),
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want: require.False,
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resolve: true,
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usePrivate: true,
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}, {
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name: "private_resolve",
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ip: netip.MustParseAddr("192.168.0.1"),
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want: require.True,
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resolve: true,
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usePrivate: true,
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}, {
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name: "private_no_resolve",
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ip: netip.MustParseAddr("192.168.0.1"),
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want: require.False,
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resolve: true,
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usePrivate: false,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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srv.conf.ResolveClients = tc.resolve
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srv.conf.UsePrivateRDNS = tc.usePrivate
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ok := srv.ShouldResolveClient(tc.ip)
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tc.want(t, ok)
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})
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}
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}
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@ -17,6 +17,7 @@ import (
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"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/AdGuardHome/internal/querylog"
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"github.com/AdguardTeam/AdGuardHome/internal/rdns"
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"github.com/AdguardTeam/AdGuardHome/internal/stats"
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"github.com/AdguardTeam/AdGuardHome/internal/whois"
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"github.com/AdguardTeam/dnsproxy/proxy"
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@ -167,30 +168,77 @@ func initDNSServer(
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return fmt.Errorf("dnsServer.Prepare: %w", err)
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}
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if config.Clients.Sources.RDNS {
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Context.rdns = NewRDNS(Context.dnsServer, &Context.clients, config.DNS.UsePrivateRDNS)
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}
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initRDNS()
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initWHOIS()
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return nil
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}
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const (
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// defaultQueueSize is the size of queue of IPs for rDNS and WHOIS
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// processing.
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defaultQueueSize = 255
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// defaultCacheSize is the maximum size of the cache for rDNS and WHOIS
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// processing. It must be greater than zero.
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defaultCacheSize = 10_000
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// defaultIPTTL is the Time to Live duration for IP addresses cached by
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// rDNS and WHOIS.
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defaultIPTTL = 1 * time.Hour
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)
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// initRDNS initializes the rDNS.
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func initRDNS() {
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Context.rdnsCh = make(chan netip.Addr, defaultQueueSize)
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// TODO(s.chzhen): Add ability to disable it on dns server configuration
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// update in [dnsforward] package.
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r := rdns.New(&rdns.Config{
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Exchanger: Context.dnsServer,
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CacheSize: defaultCacheSize,
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CacheTTL: defaultIPTTL,
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})
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go processRDNS(r)
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}
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// processRDNS processes reverse DNS lookup queries. It is intended to be used
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// as a goroutine.
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func processRDNS(r rdns.Interface) {
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defer log.OnPanic("rdns")
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for ip := range Context.rdnsCh {
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ok := Context.dnsServer.ShouldResolveClient(ip)
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if !ok {
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continue
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}
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host, changed := r.Process(ip)
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if host == "" || !changed {
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continue
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}
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ok = Context.clients.AddHost(ip, host, ClientSourceRDNS)
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if ok {
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continue
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}
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log.Debug(
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"dns: can't set rdns info for client %q: already set with higher priority source",
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ip,
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)
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}
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}
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// initWHOIS initializes the WHOIS.
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//
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// TODO(s.chzhen): Consider making configurable.
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func initWHOIS() {
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const (
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// defaultQueueSize is the size of queue of IPs for WHOIS processing.
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defaultQueueSize = 255
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// defaultTimeout is the timeout for WHOIS requests.
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defaultTimeout = 5 * time.Second
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// defaultCacheSize is the maximum size of the cache. If it's zero,
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// cache size is unlimited.
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defaultCacheSize = 10_000
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// defaultMaxConnReadSize is an upper limit in bytes for reading from
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// net.Conn.
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defaultMaxConnReadSize = 64 * 1024
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@ -200,9 +248,6 @@ func initWHOIS() {
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// defaultMaxInfoLen is the maximum length of whois.Info fields.
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defaultMaxInfoLen = 250
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// defaultIPTTL is the Time to Live duration for cached IP addresses.
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defaultIPTTL = 1 * time.Hour
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)
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Context.whoisCh = make(chan netip.Addr, defaultQueueSize)
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@ -274,11 +319,7 @@ func onDNSRequest(pctx *proxy.DNSContext) {
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return
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}
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srcs := config.Clients.Sources
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if srcs.RDNS && !ip.IsLoopback() {
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Context.rdns.Begin(ip)
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}
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Context.rdnsCh <- ip
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Context.whoisCh <- ip
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}
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@ -517,11 +558,7 @@ func startDNSServer() error {
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const topClientsNumber = 100 // the number of clients to get
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for _, ip := range Context.stats.TopClientsIP(topClientsNumber) {
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srcs := config.Clients.Sources
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if srcs.RDNS && !ip.IsLoopback() {
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Context.rdns.Begin(ip)
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}
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Context.rdnsCh <- ip
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Context.whoisCh <- ip
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}
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@ -56,7 +56,6 @@ type homeContext struct {
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stats stats.Interface // statistics module
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queryLog querylog.QueryLog // query log module
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dnsServer *dnsforward.Server // DNS module
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rdns *RDNS // rDNS module
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dhcpServer dhcpd.Interface // DHCP module
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auth *Auth // HTTP authentication module
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filters *filtering.DNSFilter // DNS filtering module
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@ -83,6 +82,9 @@ type homeContext struct {
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client *http.Client
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appSignalChannel chan os.Signal // Channel for receiving OS signals by the console app
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// rdnsCh is the channel for receiving IPs for rDNS processing.
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rdnsCh chan netip.Addr
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// whoisCh is the channel for receiving IPs for WHOIS processing.
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whoisCh chan netip.Addr
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@ -1,143 +0,0 @@
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package home
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import (
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"encoding/binary"
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"net/netip"
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"sync/atomic"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
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"github.com/AdguardTeam/golibs/cache"
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"github.com/AdguardTeam/golibs/errors"
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"github.com/AdguardTeam/golibs/log"
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)
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// RDNS resolves clients' addresses to enrich their metadata.
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type RDNS struct {
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exchanger dnsforward.RDNSExchanger
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clients *clientsContainer
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// ipCh used to pass client's IP to rDNS workerLoop.
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ipCh chan netip.Addr
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// ipCache caches the IP addresses to be resolved by rDNS. The resolved
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// address stays here while it's inside clients. After leaving clients the
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// address will be resolved once again. If the address couldn't be
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// resolved, cache prevents further attempts to resolve it for some time.
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ipCache cache.Cache
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// usePrivate stores the state of current private reverse-DNS resolving
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// settings.
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usePrivate atomic.Bool
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}
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// Default AdGuard Home reverse DNS values.
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const (
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revDNSCacheSize = 10000
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// TODO(e.burkov): Make these values configurable.
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revDNSCacheTTL = 24 * 60 * 60
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revDNSFailureCacheTTL = 1 * 60 * 60
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revDNSQueueSize = 256
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)
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// NewRDNS creates and returns initialized RDNS.
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func NewRDNS(
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exchanger dnsforward.RDNSExchanger,
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clients *clientsContainer,
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usePrivate bool,
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) (rDNS *RDNS) {
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rDNS = &RDNS{
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exchanger: exchanger,
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clients: clients,
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ipCache: cache.New(cache.Config{
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EnableLRU: true,
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MaxCount: revDNSCacheSize,
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}),
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ipCh: make(chan netip.Addr, revDNSQueueSize),
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}
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rDNS.usePrivate.Store(usePrivate)
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go rDNS.workerLoop()
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return rDNS
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}
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|
||||
// ensurePrivateCache ensures that the state of the RDNS cache is consistent
|
||||
// with the current private client RDNS resolving settings.
|
||||
//
|
||||
// TODO(e.burkov): Clearing cache each time this value changed is not a perfect
|
||||
// approach since only unresolved locally-served addresses should be removed.
|
||||
// Implement when improving the cache.
|
||||
func (r *RDNS) ensurePrivateCache() {
|
||||
usePrivate := r.exchanger.ResolvesPrivatePTR()
|
||||
if r.usePrivate.CompareAndSwap(!usePrivate, usePrivate) {
|
||||
r.ipCache.Clear()
|
||||
}
|
||||
}
|
||||
|
||||
// isCached returns true if ip is already cached and not expired yet. It also
|
||||
// caches it otherwise.
|
||||
func (r *RDNS) isCached(ip netip.Addr) (ok bool) {
|
||||
ipBytes := ip.AsSlice()
|
||||
now := uint64(time.Now().Unix())
|
||||
if expire := r.ipCache.Get(ipBytes); len(expire) != 0 {
|
||||
return binary.BigEndian.Uint64(expire) > now
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
// cache caches the ip address for ttl seconds.
|
||||
func (r *RDNS) cache(ip netip.Addr, ttl uint64) {
|
||||
ipData := ip.AsSlice()
|
||||
|
||||
ttlData := [8]byte{}
|
||||
binary.BigEndian.PutUint64(ttlData[:], uint64(time.Now().Unix())+ttl)
|
||||
|
||||
r.ipCache.Set(ipData, ttlData[:])
|
||||
}
|
||||
|
||||
// Begin adds the ip to the resolving queue if it is not cached or already
|
||||
// resolved.
|
||||
func (r *RDNS) Begin(ip netip.Addr) {
|
||||
r.ensurePrivateCache()
|
||||
|
||||
if r.isCached(ip) || r.clients.clientSource(ip) > ClientSourceRDNS {
|
||||
return
|
||||
}
|
||||
|
||||
select {
|
||||
case r.ipCh <- ip:
|
||||
log.Debug("rdns: %q added to queue", ip)
|
||||
default:
|
||||
log.Debug("rdns: queue is full")
|
||||
}
|
||||
}
|
||||
|
||||
// workerLoop handles incoming IP addresses from ipChan and adds it into
|
||||
// clients.
|
||||
func (r *RDNS) workerLoop() {
|
||||
defer log.OnPanic("rdns")
|
||||
|
||||
for ip := range r.ipCh {
|
||||
ttl := uint64(revDNSCacheTTL)
|
||||
|
||||
host, err := r.exchanger.Exchange(ip.AsSlice())
|
||||
if err != nil {
|
||||
log.Debug("rdns: resolving %q: %s", ip, err)
|
||||
if errors.Is(err, dnsforward.ErrRDNSFailed) {
|
||||
// Cache failure for a less time.
|
||||
ttl = revDNSFailureCacheTTL
|
||||
}
|
||||
}
|
||||
|
||||
r.cache(ip, ttl)
|
||||
|
||||
if host != "" {
|
||||
_ = r.clients.AddHost(ip, host, ClientSourceRDNS)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1,264 +0,0 @@
|
|||
package home
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"fmt"
|
||||
"net"
|
||||
"net/netip"
|
||||
"sync"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
|
||||
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
|
||||
"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"
|
||||
"github.com/stretchr/testify/assert"
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestRDNS_Begin(t *testing.T) {
|
||||
aghtest.ReplaceLogLevel(t, log.DEBUG)
|
||||
w := &bytes.Buffer{}
|
||||
aghtest.ReplaceLogWriter(t, w)
|
||||
|
||||
ip1234, ip1235 := netip.MustParseAddr("1.2.3.4"), netip.MustParseAddr("1.2.3.5")
|
||||
|
||||
testCases := []struct {
|
||||
cliIDIndex map[string]*Client
|
||||
customChan chan netip.Addr
|
||||
name string
|
||||
wantLog string
|
||||
ip netip.Addr
|
||||
wantCacheHit int
|
||||
wantCacheMiss int
|
||||
}{{
|
||||
cliIDIndex: map[string]*Client{},
|
||||
customChan: nil,
|
||||
name: "cached",
|
||||
wantLog: "",
|
||||
ip: ip1234,
|
||||
wantCacheHit: 1,
|
||||
wantCacheMiss: 0,
|
||||
}, {
|
||||
cliIDIndex: map[string]*Client{},
|
||||
customChan: nil,
|
||||
name: "not_cached",
|
||||
wantLog: "rdns: queue is full",
|
||||
ip: ip1235,
|
||||
wantCacheHit: 0,
|
||||
wantCacheMiss: 1,
|
||||
}, {
|
||||
cliIDIndex: map[string]*Client{"1.2.3.5": {}},
|
||||
customChan: nil,
|
||||
name: "already_in_clients",
|
||||
wantLog: "",
|
||||
ip: ip1235,
|
||||
wantCacheHit: 0,
|
||||
wantCacheMiss: 1,
|
||||
}, {
|
||||
cliIDIndex: map[string]*Client{},
|
||||
customChan: make(chan netip.Addr, 1),
|
||||
name: "add_to_queue",
|
||||
wantLog: `rdns: "1.2.3.5" added to queue`,
|
||||
ip: ip1235,
|
||||
wantCacheHit: 0,
|
||||
wantCacheMiss: 1,
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
w.Reset()
|
||||
|
||||
ipCache := cache.New(cache.Config{
|
||||
EnableLRU: true,
|
||||
MaxCount: revDNSCacheSize,
|
||||
})
|
||||
ttl := make([]byte, binary.Size(uint64(0)))
|
||||
binary.BigEndian.PutUint64(ttl, uint64(time.Now().Add(100*time.Hour).Unix()))
|
||||
|
||||
rdns := &RDNS{
|
||||
ipCache: ipCache,
|
||||
exchanger: &rDNSExchanger{
|
||||
ex: aghtest.NewErrorUpstream(),
|
||||
},
|
||||
clients: &clientsContainer{
|
||||
list: map[string]*Client{},
|
||||
idIndex: tc.cliIDIndex,
|
||||
ipToRC: map[netip.Addr]*RuntimeClient{},
|
||||
allTags: stringutil.NewSet(),
|
||||
},
|
||||
}
|
||||
ipCache.Clear()
|
||||
ipCache.Set(net.IP{1, 2, 3, 4}, ttl)
|
||||
|
||||
if tc.customChan != nil {
|
||||
rdns.ipCh = tc.customChan
|
||||
defer close(tc.customChan)
|
||||
}
|
||||
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
rdns.Begin(tc.ip)
|
||||
assert.Equal(t, tc.wantCacheHit, ipCache.Stats().Hit)
|
||||
assert.Equal(t, tc.wantCacheMiss, ipCache.Stats().Miss)
|
||||
assert.Contains(t, w.String(), tc.wantLog)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// rDNSExchanger is a mock dnsforward.RDNSExchanger implementation for tests.
|
||||
type rDNSExchanger struct {
|
||||
ex upstream.Upstream
|
||||
usePrivate bool
|
||||
}
|
||||
|
||||
// Exchange implements dnsforward.RDNSExchanger interface for *RDNSExchanger.
|
||||
func (e *rDNSExchanger) Exchange(ip net.IP) (host string, err error) {
|
||||
rev, err := netutil.IPToReversedAddr(ip)
|
||||
if err != nil {
|
||||
return "", fmt.Errorf("reversing ip: %w", err)
|
||||
}
|
||||
|
||||
req := &dns.Msg{
|
||||
Question: []dns.Question{{
|
||||
Name: dns.Fqdn(rev),
|
||||
Qclass: dns.ClassINET,
|
||||
Qtype: dns.TypePTR,
|
||||
}},
|
||||
}
|
||||
|
||||
resp, err := e.ex.Exchange(req)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
if len(resp.Answer) == 0 {
|
||||
return "", nil
|
||||
}
|
||||
|
||||
return resp.Answer[0].Header().Name, nil
|
||||
}
|
||||
|
||||
// Exchange implements dnsforward.RDNSExchanger interface for *RDNSExchanger.
|
||||
func (e *rDNSExchanger) ResolvesPrivatePTR() (ok bool) {
|
||||
return e.usePrivate
|
||||
}
|
||||
|
||||
func TestRDNS_ensurePrivateCache(t *testing.T) {
|
||||
data := []byte{1, 2, 3, 4}
|
||||
|
||||
ipCache := cache.New(cache.Config{
|
||||
EnableLRU: true,
|
||||
MaxCount: revDNSCacheSize,
|
||||
})
|
||||
|
||||
ex := &rDNSExchanger{
|
||||
ex: aghtest.NewErrorUpstream(),
|
||||
}
|
||||
|
||||
rdns := &RDNS{
|
||||
ipCache: ipCache,
|
||||
exchanger: ex,
|
||||
}
|
||||
|
||||
rdns.ipCache.Set(data, data)
|
||||
require.NotZero(t, rdns.ipCache.Stats().Count)
|
||||
|
||||
ex.usePrivate = !ex.usePrivate
|
||||
|
||||
rdns.ensurePrivateCache()
|
||||
require.Zero(t, rdns.ipCache.Stats().Count)
|
||||
}
|
||||
|
||||
func TestRDNS_WorkerLoop(t *testing.T) {
|
||||
aghtest.ReplaceLogLevel(t, log.DEBUG)
|
||||
w := &bytes.Buffer{}
|
||||
aghtest.ReplaceLogWriter(t, w)
|
||||
|
||||
localIP := netip.MustParseAddr("192.168.1.1")
|
||||
revIPv4, err := netutil.IPToReversedAddr(localIP.AsSlice())
|
||||
require.NoError(t, err)
|
||||
|
||||
revIPv6, err := netutil.IPToReversedAddr(net.ParseIP("2a00:1450:400c:c06::93"))
|
||||
require.NoError(t, err)
|
||||
|
||||
locUpstream := &aghtest.UpstreamMock{
|
||||
OnAddress: func() (addr string) { return "local.upstream.example" },
|
||||
OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
|
||||
return aghalg.Coalesce(
|
||||
aghtest.MatchedResponse(req, dns.TypePTR, revIPv4, "local.domain"),
|
||||
aghtest.MatchedResponse(req, dns.TypePTR, revIPv6, "ipv6.domain"),
|
||||
new(dns.Msg).SetRcode(req, dns.RcodeNameError),
|
||||
), nil
|
||||
},
|
||||
}
|
||||
|
||||
errUpstream := aghtest.NewErrorUpstream()
|
||||
|
||||
testCases := []struct {
|
||||
ups upstream.Upstream
|
||||
cliIP netip.Addr
|
||||
wantLog string
|
||||
name string
|
||||
wantClientSource clientSource
|
||||
}{{
|
||||
ups: locUpstream,
|
||||
cliIP: localIP,
|
||||
wantLog: "",
|
||||
name: "all_good",
|
||||
wantClientSource: ClientSourceRDNS,
|
||||
}, {
|
||||
ups: errUpstream,
|
||||
cliIP: netip.MustParseAddr("192.168.1.2"),
|
||||
wantLog: `rdns: resolving "192.168.1.2": test upstream error`,
|
||||
name: "resolve_error",
|
||||
wantClientSource: ClientSourceNone,
|
||||
}, {
|
||||
ups: locUpstream,
|
||||
cliIP: netip.MustParseAddr("2a00:1450:400c:c06::93"),
|
||||
wantLog: "",
|
||||
name: "ipv6_good",
|
||||
wantClientSource: ClientSourceRDNS,
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
w.Reset()
|
||||
|
||||
cc := newClientsContainer(t)
|
||||
ch := make(chan netip.Addr)
|
||||
rdns := &RDNS{
|
||||
exchanger: &rDNSExchanger{
|
||||
ex: tc.ups,
|
||||
},
|
||||
clients: cc,
|
||||
ipCh: ch,
|
||||
ipCache: cache.New(cache.Config{
|
||||
EnableLRU: true,
|
||||
MaxCount: revDNSCacheSize,
|
||||
}),
|
||||
}
|
||||
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(1)
|
||||
go func() {
|
||||
rdns.workerLoop()
|
||||
wg.Done()
|
||||
}()
|
||||
|
||||
ch <- tc.cliIP
|
||||
close(ch)
|
||||
wg.Wait()
|
||||
|
||||
if tc.wantLog != "" {
|
||||
assert.Contains(t, w.String(), tc.wantLog)
|
||||
}
|
||||
|
||||
assert.Equal(t, tc.wantClientSource, cc.clientSource(tc.cliIP))
|
||||
})
|
||||
}
|
||||
}
|
||||
132
internal/rdns/rdns.go
Normal file
132
internal/rdns/rdns.go
Normal file
|
|
@ -0,0 +1,132 @@
|
|||
// Package rdns processes reverse DNS lookup queries.
|
||||
package rdns
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/golibs/errors"
|
||||
"github.com/AdguardTeam/golibs/log"
|
||||
"github.com/bluele/gcache"
|
||||
)
|
||||
|
||||
// Interface processes rDNS queries.
|
||||
type Interface interface {
|
||||
// Process makes rDNS request and returns domain name. changed indicates
|
||||
// that domain name was updated since last request.
|
||||
Process(ip netip.Addr) (host string, changed bool)
|
||||
}
|
||||
|
||||
// Empty is an empty [Inteface] implementation which does nothing.
|
||||
type Empty struct{}
|
||||
|
||||
// type check
|
||||
var _ Interface = (*Empty)(nil)
|
||||
|
||||
// Process implements the [Interface] interface for Empty.
|
||||
func (Empty) Process(_ netip.Addr) (host string, changed bool) {
|
||||
return "", false
|
||||
}
|
||||
|
||||
// Exchanger is a resolver for clients' addresses.
|
||||
type Exchanger interface {
|
||||
// Exchange tries to resolve the ip in a suitable way, i.e. either as local
|
||||
// or as external.
|
||||
Exchange(ip netip.Addr) (host string, err error)
|
||||
}
|
||||
|
||||
// Config is the configuration structure for Default.
|
||||
type Config struct {
|
||||
// Exchanger resolves IP addresses to domain names.
|
||||
Exchanger Exchanger
|
||||
|
||||
// CacheSize is the maximum size of the cache. It must be greater than
|
||||
// zero.
|
||||
CacheSize int
|
||||
|
||||
// CacheTTL is the Time to Live duration for cached IP addresses.
|
||||
CacheTTL time.Duration
|
||||
}
|
||||
|
||||
// Default is the default rDNS query processor.
|
||||
type Default struct {
|
||||
// cache is the cache containing IP addresses of clients. An active IP
|
||||
// address is resolved once again after it expires. If IP address couldn't
|
||||
// be resolved, it stays here for some time to prevent further attempts to
|
||||
// resolve the same IP.
|
||||
cache gcache.Cache
|
||||
|
||||
// exchanger resolves IP addresses to domain names.
|
||||
exchanger Exchanger
|
||||
|
||||
// cacheTTL is the Time to Live duration for cached IP addresses.
|
||||
cacheTTL time.Duration
|
||||
}
|
||||
|
||||
// New returns a new default rDNS query processor. conf must not be nil.
|
||||
func New(conf *Config) (r *Default) {
|
||||
return &Default{
|
||||
cache: gcache.New(conf.CacheSize).LRU().Build(),
|
||||
exchanger: conf.Exchanger,
|
||||
cacheTTL: conf.CacheTTL,
|
||||
}
|
||||
}
|
||||
|
||||
// type check
|
||||
var _ Interface = (*Default)(nil)
|
||||
|
||||
// Process implements the [Interface] interface for Default.
|
||||
func (r *Default) Process(ip netip.Addr) (host string, changed bool) {
|
||||
fromCache, expired := r.findInCache(ip)
|
||||
if !expired {
|
||||
return fromCache, false
|
||||
}
|
||||
|
||||
host, err := r.exchanger.Exchange(ip)
|
||||
if err != nil {
|
||||
log.Debug("rdns: resolving %q: %s", ip, err)
|
||||
}
|
||||
|
||||
item := &cacheItem{
|
||||
expiry: time.Now().Add(r.cacheTTL),
|
||||
host: host,
|
||||
}
|
||||
|
||||
err = r.cache.Set(ip, item)
|
||||
if err != nil {
|
||||
log.Debug("rdns: cache: adding item %q: %s", ip, err)
|
||||
}
|
||||
|
||||
return host, fromCache == "" || host != fromCache
|
||||
}
|
||||
|
||||
// findInCache finds domain name in the cache. expired is true if host is not
|
||||
// valid anymore.
|
||||
func (r *Default) findInCache(ip netip.Addr) (host string, expired bool) {
|
||||
val, err := r.cache.Get(ip)
|
||||
if err != nil {
|
||||
if !errors.Is(err, gcache.KeyNotFoundError) {
|
||||
log.Debug("rdns: cache: retrieving %q: %s", ip, err)
|
||||
}
|
||||
|
||||
return "", true
|
||||
}
|
||||
|
||||
item, ok := val.(*cacheItem)
|
||||
if !ok {
|
||||
log.Debug("rdns: cache: %q bad type %T", ip, val)
|
||||
|
||||
return "", true
|
||||
}
|
||||
|
||||
return item.host, time.Now().After(item.expiry)
|
||||
}
|
||||
|
||||
// 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
|
||||
|
||||
// host is the domain name of a runtime client.
|
||||
host string
|
||||
}
|
||||
105
internal/rdns/rdns_test.go
Normal file
105
internal/rdns/rdns_test.go
Normal file
|
|
@ -0,0 +1,105 @@
|
|||
package rdns_test
|
||||
|
||||
import (
|
||||
"net/netip"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/internal/rdns"
|
||||
"github.com/AdguardTeam/golibs/netutil"
|
||||
"github.com/stretchr/testify/assert"
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
// fakeRDNSExchanger is a mock [rdns.Exchanger] implementation for tests.
|
||||
type fakeRDNSExchanger struct {
|
||||
OnExchange func(ip netip.Addr) (host string, err error)
|
||||
}
|
||||
|
||||
// type check
|
||||
var _ rdns.Exchanger = (*fakeRDNSExchanger)(nil)
|
||||
|
||||
// Exchange implements [rdns.Exchanger] interface for *fakeRDNSExchanger.
|
||||
func (e *fakeRDNSExchanger) Exchange(ip netip.Addr) (host string, err error) {
|
||||
return e.OnExchange(ip)
|
||||
}
|
||||
|
||||
func TestDefault_Process(t *testing.T) {
|
||||
ip1 := netip.MustParseAddr("1.2.3.4")
|
||||
revAddr1, err := netutil.IPToReversedAddr(ip1.AsSlice())
|
||||
require.NoError(t, err)
|
||||
|
||||
ip2 := netip.MustParseAddr("4.3.2.1")
|
||||
revAddr2, err := netutil.IPToReversedAddr(ip2.AsSlice())
|
||||
require.NoError(t, err)
|
||||
|
||||
localIP := netip.MustParseAddr("192.168.0.1")
|
||||
localRevAddr1, err := netutil.IPToReversedAddr(localIP.AsSlice())
|
||||
require.NoError(t, err)
|
||||
|
||||
config := &rdns.Config{
|
||||
CacheSize: 100,
|
||||
CacheTTL: time.Hour,
|
||||
}
|
||||
|
||||
testCases := []struct {
|
||||
name string
|
||||
addr netip.Addr
|
||||
want string
|
||||
}{{
|
||||
name: "first",
|
||||
addr: ip1,
|
||||
want: revAddr1,
|
||||
}, {
|
||||
name: "second",
|
||||
addr: ip2,
|
||||
want: revAddr2,
|
||||
}, {
|
||||
name: "empty",
|
||||
addr: netip.MustParseAddr("0.0.0.0"),
|
||||
want: "",
|
||||
}, {
|
||||
name: "private",
|
||||
addr: localIP,
|
||||
want: localRevAddr1,
|
||||
}}
|
||||
|
||||
for _, tc := range testCases {
|
||||
t.Run(tc.name, func(t *testing.T) {
|
||||
hit := 0
|
||||
onExchange := func(ip netip.Addr) (host string, err error) {
|
||||
hit++
|
||||
|
||||
switch ip {
|
||||
case ip1:
|
||||
return revAddr1, nil
|
||||
case ip2:
|
||||
return revAddr2, nil
|
||||
case localIP:
|
||||
return localRevAddr1, nil
|
||||
default:
|
||||
return "", nil
|
||||
}
|
||||
}
|
||||
exchanger := &fakeRDNSExchanger{
|
||||
OnExchange: onExchange,
|
||||
}
|
||||
|
||||
config.Exchanger = exchanger
|
||||
r := rdns.New(config)
|
||||
|
||||
got, changed := r.Process(tc.addr)
|
||||
require.True(t, changed)
|
||||
|
||||
assert.Equal(t, tc.want, got)
|
||||
assert.Equal(t, 1, hit)
|
||||
|
||||
// From cache.
|
||||
got, changed = r.Process(tc.addr)
|
||||
require.False(t, changed)
|
||||
|
||||
assert.Equal(t, tc.want, got)
|
||||
assert.Equal(t, 1, hit)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
|
@ -177,6 +177,7 @@ run_linter gocognit --over 10\
|
|||
./internal/aghhttp/\
|
||||
./internal/aghio/\
|
||||
./internal/next/\
|
||||
./internal/rdns/\
|
||||
./internal/tools/\
|
||||
./internal/version/\
|
||||
./internal/whois/\
|
||||
|
|
|
|||
Loading…
Reference in a new issue