net: add LookupMX
R=rsc
CC=golang-dev
https://golang.org/cl/1976049
diff --git a/src/pkg/net/dnsclient.go b/src/pkg/net/dnsclient.go
index 619d9e2..18bd72c 100644
--- a/src/pkg/net/dnsclient.go
+++ b/src/pkg/net/dnsclient.go
@@ -335,3 +335,22 @@
}
return
}
+
+type MX struct {
+ Host string
+ Pref uint16
+}
+
+func LookupMX(name string) (entries []*MX, err os.Error) {
+ var records []dnsRR
+ _, records, err = lookup(name, dnsTypeMX)
+ if err != nil {
+ return
+ }
+ entries = make([]*MX, len(records))
+ for i := 0; i < len(records); i++ {
+ r := records[i].(*dnsRR_MX)
+ entries[i] = &MX{r.Mx, r.Pref}
+ }
+ return
+}
