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- DNS: set RecursionAvailable flag in response message

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This commit is contained in:
Simon Zolin 2019-12-19 11:52:21 +03:00
parent b54bf94697
commit 4540a4e94a
1 changed files with 19 additions and 16 deletions
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35
dnsforward/dnsforward.go
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@ -635,8 +635,7 @@ func (s *Server) filterDNSRequest(d *proxy.DNSContext) (*dnsfilter.Result, error
d.Res = s.genDNSFilterMessage(d, &res)
} else if res.Reason == dnsfilter.ReasonRewrite && len(res.IPList) != 0 {
resp := dns.Msg{}
resp.SetReply(req)
resp := s.makeResponse(req)
name := host
if len(res.CanonName) != 0 {
@ -657,7 +656,7 @@ func (s *Server) filterDNSRequest(d *proxy.DNSContext) (*dnsfilter.Result, error
}
}
d.Res = &resp
d.Res = resp
}
return &res, err
@ -711,6 +710,15 @@ func (s *Server) filterResponse(d *proxy.DNSContext) (*dnsfilter.Result, error)
return nil, nil
}
// Create a DNS response by DNS request and set necessary flags
func (s *Server) makeResponse(req *dns.Msg) *dns.Msg {
resp := dns.Msg{}
resp.SetReply(req)
resp.RecursionAvailable = true
resp.Compress = true
return &resp
}
// genDNSFilterMessage generates a DNS message corresponding to the filtering result
func (s *Server) genDNSFilterMessage(d *proxy.DNSContext, result *dnsfilter.Result) *dns.Msg {
m := d.Req
@ -758,17 +766,15 @@ func (s *Server) genServerFailure(request *dns.Msg) *dns.Msg {
}
func (s *Server) genARecord(request *dns.Msg, ip net.IP) *dns.Msg {
resp := dns.Msg{}
resp.SetReply(request)
resp := s.makeResponse(request)
resp.Answer = append(resp.Answer, s.genAAnswer(request, ip))
return &resp
return resp
}
func (s *Server) genAAAARecord(request *dns.Msg, ip net.IP) *dns.Msg {
resp := dns.Msg{}
resp.SetReply(request)
resp := s.makeResponse(request)
resp.Answer = append(resp.Answer, s.genAAAAAnswer(request, ip))
return &resp
return resp
}
func (s *Server) genAAnswer(req *dns.Msg, ip net.IP) *dns.A {
@ -804,9 +810,8 @@ func (s *Server) genResponseWithIP(req *dns.Msg, ip net.IP) *dns.Msg {
}
// empty response
resp := dns.Msg{}
resp.SetReply(req)
return &resp
resp := s.makeResponse(req)
return resp
}
func (s *Server) genBlockedHost(request *dns.Msg, newAddr string, d *proxy.DNSContext) *dns.Msg {
@ -834,9 +839,7 @@ func (s *Server) genBlockedHost(request *dns.Msg, newAddr string, d *proxy.DNSCo
return s.genServerFailure(request)
}
resp := dns.Msg{}
resp.SetReply(request)
resp.Authoritative, resp.RecursionAvailable = true, true
resp := s.makeResponse(request)
if newContext.Res != nil {
for _, answer := range newContext.Res.Answer {
answer.Header().Name = request.Question[0].Name
@ -844,7 +847,7 @@ func (s *Server) genBlockedHost(request *dns.Msg, newAddr string, d *proxy.DNSCo
}
}
return &resp
return resp
}
// Make a CNAME response