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Pull request 2018: 6231 filter local addrs

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Merge in DNS/adguard-home from 6231-filter-local-addrs to master

Updates #6231.

Squashed commit of the following:

commit 9a60d4e33f25c7dd7eaa4366d8397389196156ac
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 28 18:59:51 2023 +0300

    dnsforward: imp code

commit f0c3452525c227b0ee6e761c4a6b68543900d5b5
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Sep 27 18:12:47 2023 +0300

    all: don't match nets

commit 572dc0f24e74560adaa4d89ddc921dfd7e1fed02
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Sep 27 13:37:48 2023 +0300

    dnsforward: move some code, rm dups

commit 3af627ce9c7f6f4d2aa695a7660b8a0027fa241c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 25 19:21:05 2023 +0300

    dnsforward: imp naming

commit cad1e4e71662836d1dfc79bc2979599b7a29fea1
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 25 19:17:53 2023 +0300

    dnsforward: imp code

commit 23d69700789d5652bd25cc089f16afb8b38e51f8
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 25 19:08:48 2023 +0300

    dnsforward: add upstream matcher

commit 5819c594a2a8d8bf2cd42883133e21ca7ed2681a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Sep 22 18:31:37 2023 +0300

    all: imp code, docs

commit d07ea96bb568161e029e22d69329a368d9eeb729
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Sep 22 18:09:09 2023 +0300

    all: imp code

commit 38a912a62c63247c4c5bb61b67ccc9bfd255feff
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Sep 22 15:48:25 2023 +0300

    all: imp code

commit 811212fa16bc231a8da990c075d7231c471c7e3b
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 21 19:05:07 2023 +0300

    all: imp addrs detection
This commit is contained in:
Eugene Burkov
2023-09-28 19:11:11 +03:00
parent 93ab0fde23
commit c3f141a0a8
9 changed files with 284 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
internal/dnsforward/dnsforward.go
View File

@@ -439,57 +439,6 @@ func (s *Server) startLocked() error {
// faster than ordinary upstreams.
const defaultLocalTimeout = 1 * time.Second
// collectDNSIPAddrs returns IP addresses the server is listening on without
// port numbers. For internal use only.
func (s *Server) collectDNSIPAddrs() (addrs []string, err error) {
addrs = make([]string, len(s.conf.TCPListenAddrs)+len(s.conf.UDPListenAddrs))
var i int
var ip net.IP
for _, addr := range s.conf.TCPListenAddrs {
if addr == nil {
continue
}
if ip = addr.IP; ip.IsUnspecified() {
return aghnet.CollectAllIfacesAddrs()
}
addrs[i] = ip.String()
i++
}
for _, addr := range s.conf.UDPListenAddrs {
if addr == nil {
continue
}
if ip = addr.IP; ip.IsUnspecified() {
return aghnet.CollectAllIfacesAddrs()
}
addrs[i] = ip.String()
i++
}
return addrs[:i], nil
}
func (s *Server) filterOurDNSAddrs(addrs []string) (filtered []string, err error) {
var ourAddrs []string
ourAddrs, err = s.collectDNSIPAddrs()
if err != nil {
return nil, err
}
ourAddrsSet := stringutil.NewSet(ourAddrs...)
log.Debug("dnsforward: filtering out %s", ourAddrsSet.String())
// TODO(e.burkov): The approach of subtracting sets of strings is not
// really applicable here since in case of listening on all network
// interfaces we should check the whole interface's network to cut off
// all the loopback addresses as well.
return stringutil.FilterOut(addrs, ourAddrsSet.Has), nil
}
// setupLocalResolvers initializes the resolvers for local addresses. For
// internal use only.
func (s *Server) setupLocalResolvers() (err error) {
@@ -503,18 +452,12 @@ func (s *Server) setupLocalResolvers() (err error) {
resolvers = stringutil.FilterOut(resolvers, IsCommentOrEmpty)
}
resolvers, err = s.filterOurDNSAddrs(resolvers)
if err != nil {
return err
}
log.Debug("dnsforward: upstreams to resolve ptr for local addresses: %v", resolvers)
uc, err := s.prepareUpstreamConfig(resolvers, nil, &upstream.Options{
uc, err := s.prepareLocalUpstreamConfig(resolvers, nil, &upstream.Options{
Bootstrap: bootstraps,
Timeout: defaultLocalTimeout,
// TODO(e.burkov): Should we verify server's certificates?
PreferIPv6: s.conf.BootstrapPreferIPv6,
})
if err != nil {