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Merge pull request #894 from sanimej/dns

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Set Recursion Available bit in query responses.
This commit is contained in:
Madhu Venugopal 2016-02-17 08:42:17 -08:00
commit 577159e0cb
1 changed files with 7 additions and 1 deletions
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8
libnetwork/resolver.go
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@ -35,7 +35,7 @@ const (
dnsPort = "53" dnsPort = "53"
ptrIPv4domain = ".in-addr.arpa." ptrIPv4domain = ".in-addr.arpa."
ptrIPv6domain = ".ip6.arpa." ptrIPv6domain = ".ip6.arpa."
respTTL = 1800 respTTL = 600
maxExtDNS = 3 //max number of external servers to try maxExtDNS = 3 //max number of external servers to try
) )
@ -147,6 +147,10 @@ func (r *resolver) ResolverOptions() []string {
return []string{"ndots:0"} return []string{"ndots:0"}
} }
func setCommonFlags(msg *dns.Msg) {
msg.RecursionAvailable = true
}
func (r *resolver) handleIPv4Query(name string, query *dns.Msg) (*dns.Msg, error) { func (r *resolver) handleIPv4Query(name string, query *dns.Msg) (*dns.Msg, error) {
addr := r.sb.ResolveName(name) addr := r.sb.ResolveName(name)
if addr == nil { if addr == nil {
@ -157,6 +161,7 @@ func (r *resolver) handleIPv4Query(name string, query *dns.Msg) (*dns.Msg, error
resp := new(dns.Msg) resp := new(dns.Msg)
resp.SetReply(query) resp.SetReply(query)
setCommonFlags(resp)
rr := new(dns.A) rr := new(dns.A)
rr.Hdr = dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: respTTL} rr.Hdr = dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: respTTL}
@ -186,6 +191,7 @@ func (r *resolver) handlePTRQuery(ptr string, query *dns.Msg) (*dns.Msg, error)
resp := new(dns.Msg) resp := new(dns.Msg)
resp.SetReply(query) resp.SetReply(query)
setCommonFlags(resp)
rr := new(dns.PTR) rr := new(dns.PTR)
rr.Hdr = dns.RR_Header{Name: ptr, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: respTTL} rr.Hdr = dns.RR_Header{Name: ptr, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: respTTL}