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Pull request: * all: allow multiple hosts in reverse lookups

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Merge in DNS/adguard-home from 2269-multiple-hosts to master

For #2269.

Squashed commit of the following:

commit f8ae452540b106f2d5b130b8edb08c4e76b003f4
Merge: 8dd06f7cc 3e1f92225
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Nov 6 17:28:12 2020 +0300

    Merge branch 'master' into 2269-multiple-hosts

commit 8dd06f7cca27ec32a4690e2673603b166f82af0a
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Nov 5 20:28:33 2020 +0300

    * all: allow multiple hosts in reverse lookups
This commit is contained in:
Ainar Garipov
2020-11-06 17:34:40 +03:00
parent 3e1f922252
commit 298f74ba81
5 changed files with 116 additions and 65 deletions
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28
internal/dnsforward/filter.go
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@@ -54,24 +54,28 @@ func (s *Server) filterDNSRequest(ctx *dnsContext) (*dnsfilter.Result, error) {
} else if res.IsFiltered {
log.Tracef("Host %s is filtered, reason - %q, matched rule: %q", host, res.Reason, res.Rule)
d.Res = s.genDNSFilterMessage(d, &res)
} else if res.Reason == dnsfilter.ReasonRewrite && len(res.CanonName) != 0 && len(res.IPList) == 0 {
ctx.origQuestion = d.Req.Question[0]
// resolve canonical name, not the original host name
d.Req.Question[0].Name = dns.Fqdn(res.CanonName)
} else if res.Reason == dnsfilter.RewriteEtcHosts && len(res.ReverseHost) != 0 {
} else if res.Reason == dnsfilter.RewriteEtcHosts && len(res.ReverseHosts) != 0 {
resp := s.makeResponse(req)
ptr := &dns.PTR{}
ptr.Hdr = dns.RR_Header{
Name: req.Question[0].Name,
Rrtype: dns.TypePTR,
Ttl: s.conf.BlockedResponseTTL,
Class: dns.ClassINET,
for _, h := range res.ReverseHosts {
hdr := dns.RR_Header{
Name: req.Question[0].Name,
Rrtype: dns.TypePTR,
Ttl: s.conf.BlockedResponseTTL,
Class: dns.ClassINET,
}
ptr := &dns.PTR{
Hdr: hdr,
Ptr: h,
}
resp.Answer = append(resp.Answer, ptr)
}
ptr.Ptr = res.ReverseHost
resp.Answer = append(resp.Answer, ptr)
d.Res = resp
} else if res.Reason == dnsfilter.ReasonRewrite || res.Reason == dnsfilter.RewriteEtcHosts {
resp := s.makeResponse(req)