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Handle DNS querries of type MX

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Signed-off-by: Deep Debroy <ddebroy@docker.com>
This commit is contained in:
Deep Debroy 2017-12-20 14:32:47 -08:00
parent 00bb02b36c
commit 6a4c8d0ac9
1 changed files with 18 additions and 0 deletions
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18
libnetwork/resolver.go
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@ -224,6 +224,22 @@ func createRespMsg(query *dns.Msg) *dns.Msg {
return resp
}
func (r *resolver) handleMXQuery(name string, query *dns.Msg) (*dns.Msg, error) {
addrv4, _ := r.backend.ResolveName(name, types.IPv4)
addrv6, _ := r.backend.ResolveName(name, types.IPv6)
if addrv4 == nil && addrv6 == nil {
return nil, nil
}
// We were able to resolve the name. Respond with an empty list with
// RcodeSuccess/NOERROR so that email clients can treat it as "implicit MX"
// [RFC 5321 Section-5.1] and issue a Type A/AAAA query for the name.
resp := createRespMsg(query)
return resp, nil
}
func (r *resolver) handleIPQuery(name string, query *dns.Msg, ipType int) (*dns.Msg, error) {
var addr []net.IP
var ipv6Miss bool
@ -357,6 +373,8 @@ func (r *resolver) ServeDNS(w dns.ResponseWriter, query *dns.Msg) {
resp, err = r.handleIPQuery(name, query, types.IPv4)
case dns.TypeAAAA:
resp, err = r.handleIPQuery(name, query, types.IPv6)
case dns.TypeMX:
resp, err = r.handleMXQuery(name, query)
case dns.TypePTR:
resp, err = r.handlePTRQuery(name, query)
case dns.TypeSRV: