From ec72f9bf18c95cc79b81627433f4ac2995581d50 Mon Sep 17 00:00:00 2001
From: Corey Thomasson <cthom.lists@gmail.com>
Date: Thu, 26 Aug 2010 13:32:45 -0400
Subject: [PATCH] net: add LookupMX

R=rsc
CC=golang-dev
https://golang.org/cl/1976049
---
 src/pkg/net/dnsclient.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/pkg/net/dnsclient.go b/src/pkg/net/dnsclient.go
index 619d9e2e031..18bd72c3f16 100644
--- a/src/pkg/net/dnsclient.go
+++ b/src/pkg/net/dnsclient.go
@@ -335,3 +335,22 @@ func LookupSRV(name string) (cname string, addrs []*SRV, err os.Error) {
 	}
 	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
+}