mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-08-16 22:20:30 +03:00
Pull request: 4939 Client update
Merge in DNS/adguard-home from 4939-client-upd to master Updates #4939. Squashed commit of the following: commit 34f35822afcc8020a674cd023a5907b5b3edcb65 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Fri Feb 10 14:01:57 2023 +0300 all: imp code, docs commit 1cd8767a38f6494c92fb5ceff26abe228fcca638 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Thu Feb 9 17:20:56 2023 +0300 all: different ttls commit 66d951ba3dd72cb698b89b432cbbbdd65cb421a2 Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Thu Feb 9 14:24:47 2023 +0300 all: imp code commit 3fb8d08310296dad90783f13ba46a1d0ea11da2e Author: Eugene Burkov <E.Burkov@AdGuard.COM> Date: Wed Feb 8 19:35:29 2023 +0300 home: fix rdns check logic
This commit is contained in:
parent
b89105e3b5
commit
ec19a85ed0
@ -62,6 +62,7 @@ In this release, the schema version has changed from 14 to 15.
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### Fixed
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- Client names resolved via reverse DNS not being updated ([#4939]).
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- The icon for League Of Legends on the Blocked services page ([#5433]).
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### Removed
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@ -70,6 +71,7 @@ In this release, the schema version has changed from 14 to 15.
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[#1717]: https://github.com/AdguardTeam/AdGuardHome/issues/1717
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[#4299]: https://github.com/AdguardTeam/AdGuardHome/issues/4299
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[#4939]: https://github.com/AdguardTeam/AdGuardHome/issues/4939
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[#5433]: https://github.com/AdguardTeam/AdGuardHome/issues/5433
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<!--
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@ -253,8 +253,8 @@ func (s *Server) Resolve(host string) ([]net.IPAddr, error) {
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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, e.g. either as
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// local or as external.
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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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@ -263,13 +263,13 @@ type RDNSExchanger interface {
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}
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const (
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// rDNSEmptyAnswerErr is returned by Exchange method when the answer
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// section of respond is empty.
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rDNSEmptyAnswerErr errors.Error = "the answer section is empty"
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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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ErrRDNSNoData errors.Error = "no ptr data in response"
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// rDNSNotPTRErr is returned by Exchange method when the response is not
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// of PTR type.
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rDNSNotPTRErr errors.Error = "the response is not a ptr"
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// ErrRDNSFailed is returned by [RDNSExchanger.Exchange] if the received
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// response is not a NOERROR or NXDOMAIN.
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ErrRDNSFailed errors.Error = "failed to resolve ptr"
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)
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// type check
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@ -324,17 +324,24 @@ 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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// Distinguish between NODATA response and a failed request.
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resp := ctx.Res
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if len(resp.Answer) == 0 {
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return "", fmt.Errorf("lookup for %q: %w", arpa, rDNSEmptyAnswerErr)
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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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dns.RcodeToString[resp.Rcode],
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ErrRDNSFailed,
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)
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}
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ptr, ok := resp.Answer[0].(*dns.PTR)
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if !ok {
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return "", fmt.Errorf("type checking: %w", rDNSNotPTRErr)
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for _, ans := range resp.Answer {
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ptr, ok := ans.(*dns.PTR)
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if ok {
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return strings.TrimSuffix(ptr.Ptr, "."), nil
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}
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}
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return strings.TrimSuffix(ptr.Ptr, "."), nil
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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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@ -1221,6 +1221,9 @@ func TestServer_Exchange(t *testing.T) {
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errUpstream := aghtest.NewErrorUpstream()
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nonPtrUpstream := aghtest.NewBlockUpstream("some-host", true)
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refusingUpstream := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
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return new(dns.Msg).SetRcode(req, dns.RcodeRefused), nil
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})
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srv := &Server{
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recDetector: newRecursionDetector(0, 1),
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@ -1265,15 +1268,21 @@ func TestServer_Exchange(t *testing.T) {
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}, {
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name: "empty_answer_error",
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want: "",
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wantErr: rDNSEmptyAnswerErr,
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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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}, {
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name: "not_ptr_error",
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name: "invalid_answer",
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want: "",
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wantErr: rDNSNotPTRErr,
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wantErr: ErrRDNSNoData,
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locUpstream: nonPtrUpstream,
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req: localIP,
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}, {
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name: "refused",
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want: "",
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wantErr: ErrRDNSFailed,
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locUpstream: refusingUpstream,
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req: localIP,
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}}
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for _, tc := range testCases {
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@ -67,15 +67,18 @@ func (c *Client) closeUpstreams() (err error) {
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type clientSource uint
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// Client sources. The order determines the priority.
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// Clients information sources. The order determines the priority.
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const (
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ClientSourceWHOIS clientSource = iota
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ClientSourceNone clientSource = iota
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ClientSourceWHOIS
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ClientSourceARP
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ClientSourceRDNS
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ClientSourceDHCP
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ClientSourceHostsFile
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ClientSourcePersistent
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)
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// type check
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var _ fmt.Stringer = clientSource(0)
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// String returns a human-readable name of cs.
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@ -96,6 +99,7 @@ func (cs clientSource) String() (s string) {
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}
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}
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// type check
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var _ encoding.TextMarshaler = clientSource(0)
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// MarshalText implements encoding.TextMarshaler for the clientSource.
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@ -332,23 +336,24 @@ func (clients *clientsContainer) onDHCPLeaseChanged(flags int) {
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}
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}
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// exists checks if client with this IP address already exists.
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func (clients *clientsContainer) exists(ip netip.Addr, source clientSource) (ok bool) {
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// clientSource checks if client with this IP address already exists and returns
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// the source which updated it last. It returns [ClientSourceNone] if the
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// client doesn't exist.
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func (clients *clientsContainer) clientSource(ip netip.Addr) (src clientSource) {
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clients.lock.Lock()
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defer clients.lock.Unlock()
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_, ok = clients.findLocked(ip.String())
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_, ok := clients.findLocked(ip.String())
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if ok {
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return true
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return ClientSourcePersistent
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}
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rc, ok := clients.ipToRC[ip]
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if !ok {
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return false
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return ClientSourceNone
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}
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// Return false if the new source has higher priority.
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return source <= rc.Source
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return rc.Source
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}
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func toQueryLogWHOIS(wi *RuntimeClientWHOISInfo) (cw *querylog.ClientWHOIS) {
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@ -67,9 +67,9 @@ func TestClients(t *testing.T) {
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assert.Equal(t, "client2", c.Name)
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assert.False(t, clients.exists(cliNoneIP, ClientSourceHostsFile))
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assert.True(t, clients.exists(cli1IP, ClientSourceHostsFile))
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assert.True(t, clients.exists(cli2IP, ClientSourceHostsFile))
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assert.Equal(t, clients.clientSource(cliNoneIP), ClientSourceNone)
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assert.Equal(t, clients.clientSource(cli1IP), ClientSourcePersistent)
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assert.Equal(t, clients.clientSource(cli2IP), ClientSourcePersistent)
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})
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t.Run("add_fail_name", func(t *testing.T) {
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@ -127,8 +127,8 @@ func TestClients(t *testing.T) {
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})
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require.NoError(t, err)
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assert.False(t, clients.exists(cliOldIP, ClientSourceHostsFile))
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assert.True(t, clients.exists(cliNewIP, ClientSourceHostsFile))
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assert.Equal(t, clients.clientSource(cliOldIP), ClientSourceNone)
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assert.Equal(t, clients.clientSource(cliNewIP), ClientSourcePersistent)
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err = clients.Update("client1", &Client{
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IDs: []string{cliNew},
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@ -157,7 +157,7 @@ func TestClients(t *testing.T) {
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ok := clients.Del("client1-renamed")
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require.True(t, ok)
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assert.False(t, clients.exists(netip.MustParseAddr("1.1.1.2"), ClientSourceHostsFile))
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assert.Equal(t, clients.clientSource(netip.MustParseAddr("1.1.1.2")), ClientSourceNone)
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})
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t.Run("del_fail", func(t *testing.T) {
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@ -176,18 +176,18 @@ func TestClients(t *testing.T) {
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ok = clients.AddHost(ip, "host3", ClientSourceHostsFile)
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assert.True(t, ok)
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assert.True(t, clients.exists(ip, ClientSourceHostsFile))
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assert.Equal(t, clients.clientSource(ip), ClientSourceHostsFile)
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})
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t.Run("dhcp_replaces_arp", func(t *testing.T) {
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ip := netip.MustParseAddr("1.2.3.4")
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ok := clients.AddHost(ip, "from_arp", ClientSourceARP)
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assert.True(t, ok)
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assert.True(t, clients.exists(ip, ClientSourceARP))
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assert.Equal(t, clients.clientSource(ip), ClientSourceARP)
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ok = clients.AddHost(ip, "from_dhcp", ClientSourceDHCP)
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assert.True(t, ok)
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assert.True(t, clients.exists(ip, ClientSourceDHCP))
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assert.Equal(t, clients.clientSource(ip), ClientSourceDHCP)
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})
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t.Run("addhost_fail", func(t *testing.T) {
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@ -8,6 +8,7 @@ import (
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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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@ -30,11 +31,15 @@ type RDNS struct {
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usePrivate atomic.Bool
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}
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// Default rDNS values.
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// Default AdGuard Home reverse DNS values.
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const (
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defaultRDNSCacheSize = 10000
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defaultRDNSCacheTTL = 1 * 60 * 60
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defaultRDNSIPChSize = 256
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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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@ -48,9 +53,9 @@ func NewRDNS(
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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: defaultRDNSCacheSize,
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MaxCount: revDNSCacheSize,
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}),
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ipCh: make(chan netip.Addr, defaultRDNSIPChSize),
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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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@ -79,25 +84,28 @@ func (r *RDNS) isCached(ip netip.Addr) (ok bool) {
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ipBytes := ip.AsSlice()
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now := uint64(time.Now().Unix())
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if expire := r.ipCache.Get(ipBytes); len(expire) != 0 {
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if binary.BigEndian.Uint64(expire) > now {
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return true
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}
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return binary.BigEndian.Uint64(expire) > now
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}
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// The cache entry either expired or doesn't exist.
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ttl := make([]byte, 8)
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binary.BigEndian.PutUint64(ttl, now+defaultRDNSCacheTTL)
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r.ipCache.Set(ipBytes, ttl)
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return false
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}
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// cache caches the ip address for ttl seconds.
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func (r *RDNS) cache(ip netip.Addr, ttl uint64) {
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ipData := ip.AsSlice()
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ttlData := [8]byte{}
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binary.BigEndian.PutUint64(ttlData[:], uint64(time.Now().Unix())+ttl)
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r.ipCache.Set(ipData, ttlData[:])
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}
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// Begin adds the ip to the resolving queue if it is not cached or already
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// resolved.
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func (r *RDNS) Begin(ip netip.Addr) {
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r.ensurePrivateCache()
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if r.isCached(ip) || r.clients.exists(ip, ClientSourceRDNS) {
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if r.isCached(ip) || r.clients.clientSource(ip) > ClientSourceRDNS {
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return
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}
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@ -115,15 +123,21 @@ func (r *RDNS) workerLoop() {
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defer log.OnPanic("rdns")
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for ip := range r.ipCh {
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ttl := uint64(revDNSCacheTTL)
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host, err := r.exchanger.Exchange(ip.AsSlice())
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if err != nil {
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log.Debug("rdns: resolving %q: %s", ip, err)
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continue
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} else if host == "" {
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continue
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if errors.Is(err, dnsforward.ErrRDNSFailed) {
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// Cache failure for a less time.
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ttl = revDNSFailureCacheTTL
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}
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}
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_ = r.clients.AddHost(ip, host, ClientSourceRDNS)
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r.cache(ip, ttl)
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if host != "" {
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_ = r.clients.AddHost(ip, host, ClientSourceRDNS)
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}
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}
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}
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@ -76,7 +76,7 @@ func TestRDNS_Begin(t *testing.T) {
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ipCache := cache.New(cache.Config{
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EnableLRU: true,
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MaxCount: defaultRDNSCacheSize,
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MaxCount: revDNSCacheSize,
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})
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ttl := make([]byte, binary.Size(uint64(0)))
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binary.BigEndian.PutUint64(ttl, uint64(time.Now().Add(100*time.Hour).Unix()))
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@ -153,7 +153,7 @@ func TestRDNS_ensurePrivateCache(t *testing.T) {
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ipCache := cache.New(cache.Config{
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EnableLRU: true,
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MaxCount: defaultRDNSCacheSize,
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MaxCount: revDNSCacheSize,
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})
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ex := &rDNSExchanger{
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@ -200,25 +200,29 @@ func TestRDNS_WorkerLoop(t *testing.T) {
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errUpstream := aghtest.NewErrorUpstream()
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testCases := []struct {
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ups upstream.Upstream
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cliIP netip.Addr
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wantLog string
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name string
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ups upstream.Upstream
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cliIP netip.Addr
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wantLog string
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name string
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wantClientSource clientSource
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}{{
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ups: locUpstream,
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cliIP: localIP,
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wantLog: "",
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name: "all_good",
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ups: locUpstream,
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cliIP: localIP,
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wantLog: "",
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name: "all_good",
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wantClientSource: ClientSourceRDNS,
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}, {
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ups: errUpstream,
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cliIP: netip.MustParseAddr("192.168.1.2"),
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wantLog: `rdns: resolving "192.168.1.2": test upstream error`,
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name: "resolve_error",
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ups: errUpstream,
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cliIP: netip.MustParseAddr("192.168.1.2"),
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wantLog: `rdns: resolving "192.168.1.2": test upstream error`,
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name: "resolve_error",
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wantClientSource: ClientSourceNone,
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}, {
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ups: locUpstream,
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cliIP: netip.MustParseAddr("2a00:1450:400c:c06::93"),
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wantLog: "",
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name: "ipv6_good",
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ups: locUpstream,
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cliIP: netip.MustParseAddr("2a00:1450:400c:c06::93"),
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wantLog: "",
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name: "ipv6_good",
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wantClientSource: ClientSourceRDNS,
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}}
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for _, tc := range testCases {
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@ -237,6 +241,10 @@ func TestRDNS_WorkerLoop(t *testing.T) {
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},
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clients: cc,
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ipCh: ch,
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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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}
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t.Run(tc.name, func(t *testing.T) {
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@ -253,11 +261,9 @@ func TestRDNS_WorkerLoop(t *testing.T) {
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if tc.wantLog != "" {
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assert.Contains(t, w.String(), tc.wantLog)
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return
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}
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assert.True(t, cc.exists(tc.cliIP, ClientSourceRDNS))
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assert.Equal(t, tc.wantClientSource, cc.clientSource(tc.cliIP))
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})
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}
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}
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