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Set Recursion Available bit in query response and reduce the ttl 

Signed-off-by: Santhosh Manohar <santhosh@docker.com>
This commit is contained in:
Santhosh Manohar 2016-01-22 21:22:58 -08:00
parent 079ec162bc
commit 36fd9d02be
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"
ptrIPv4domain = ".in-addr.arpa."
ptrIPv6domain = ".ip6.arpa."
respTTL = 1800
respTTL = 600
maxExtDNS = 3 //max number of external servers to try
)
@ -147,6 +147,10 @@ func (r *resolver) ResolverOptions() []string {
return []string{"ndots:0"}
}
func setCommonFlags(msg *dns.Msg) {
msg.RecursionAvailable = true
}
func (r *resolver) handleIPv4Query(name string, query *dns.Msg) (*dns.Msg, error) {
addr := r.sb.ResolveName(name)
if addr == nil {
@ -157,6 +161,7 @@ func (r *resolver) handleIPv4Query(name string, query *dns.Msg) (*dns.Msg, error
resp := new(dns.Msg)
resp.SetReply(query)
setCommonFlags(resp)
rr := new(dns.A)
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.SetReply(query)
setCommonFlags(resp)
rr := new(dns.PTR)
rr.Hdr = dns.RR_Header{Name: ptr, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: respTTL}