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Pull request: 5117-backport-dns64

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Merge in DNS/adguard-home from 5117-backport-dns64 to master

Updates #5117.

Squashed commit of the following:

commit 8ac88534b2da52f49facef6d623ea3504a3cd5ed
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Feb 6 16:44:16 2023 +0300

    all: rm todos

commit 0aa66c5ecbadc3e372478ea4446f80fcc7457841
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Feb 6 15:40:38 2023 +0300

    all: upd dnsproxy

commit 872a8efdd2759fd9dad61de9953bc87f734ca918
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Feb 3 14:14:21 2023 +0300

    dnsforward: imp docs

commit 8efeb42cac69bbe9b8dba8c91c33b14c95397ab9
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Feb 1 02:58:01 2023 +0300

    all: rm dns64
This commit is contained in:
Eugene Burkov
2023-02-06 17:17:51 +03:00
parent 6a032bb821
commit b31bab591d
9 changed files with 74 additions and 341 deletions
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29
internal/dnsforward/dnsforward.go
View File

@@ -80,10 +80,17 @@ type Server struct {
privateNets netutil.SubnetSet
localResolvers *proxy.Proxy
sysResolvers aghnet.SystemResolvers
recDetector *recursionDetector
// dns64Prefix is the set of NAT64 prefixes used for DNS64 handling.
dns64Prefs []netip.Prefix
// recDetector is a cache for recursive requests. It is used to detect
// and prevent recursive requests only for private upstreams.
//
// See https://github.com/adguardTeam/adGuardHome/issues/3185#issuecomment-851048135.
recDetector *recursionDetector
// dns64Pref is the NAT64 prefix used for DNS64 response mapping. The major
// part of DNS64 happens inside the [proxy] package, but there still are
// some places where response mapping is needed (e.g. DHCP).
dns64Pref netip.Prefix
// anonymizer masks the client's IP addresses if needed.
anonymizer *aghnet.IPMut
@@ -477,6 +484,8 @@ func (s *Server) Prepare(conf *ServerConfig) (err error) {
return fmt.Errorf("preparing proxy: %w", err)
}
s.setupDNS64()
err = s.prepareInternalProxy()
if err != nil {
return fmt.Errorf("preparing internal proxy: %w", err)
@@ -493,18 +502,18 @@ func (s *Server) Prepare(conf *ServerConfig) (err error) {
s.registerHandlers()
err = s.setupDNS64()
if err != nil {
return fmt.Errorf("preparing DNS64: %w", err)
}
s.dnsProxy = &proxy.Proxy{Config: proxyConfig}
// TODO(e.burkov): Remove once the local resolvers logic moved to dnsproxy.
err = s.setupResolvers(s.conf.LocalPTRResolvers)
if err != nil {
return fmt.Errorf("setting up resolvers: %w", err)
}
if s.conf.UsePrivateRDNS {
proxyConfig.PrivateRDNSUpstreamConfig = s.localResolvers.UpstreamConfig
}
s.dnsProxy = &proxy.Proxy{Config: proxyConfig}
s.recDetector.clear()
return nil