From 9ac4df6b1dc7be1cecc2c4f67f365d9a4e312b8c Mon Sep 17 00:00:00 2001
From: Miek Gieben <miek@miek.nl>
Date: Fri, 25 Mar 2011 10:16:55 +0100
Subject: [PATCH] add a IsUpdate function

---
 defaults.go | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/defaults.go b/defaults.go
index eaf52730..2b36742f 100644
--- a/defaults.go
+++ b/defaults.go
@@ -13,8 +13,6 @@ func (dns *Msg) SetReply(request *Msg) {
 	dns.Question[0] = request.Question[0]
 }
 
-// IsReply?
-
 // Create a notify packet.
 func (dns *Msg) SetNotify(z string, class uint16) {
 	dns.MsgHdr.Opcode = OpcodeNotify
@@ -24,6 +22,16 @@ func (dns *Msg) SetNotify(z string, class uint16) {
 	dns.Question[0] = Question{z, TypeSOA, class}
 }
 
+// Is the message a dynamic update packet?
+func (dns *Msg) IsUpdate() (ok bool) {
+	if len(dns.Question) == 0 {
+		return false
+	}
+        ok = dns.MsgHdr.Opcode == OpcodeUpdate
+        ok = ok && dns.Question[0].Qtype == TypeSOA
+        return
+}
+
 // Is the message a valid notify packet?
 func (dns *Msg) IsNotify() (ok bool) {
 	if len(dns.Question) == 0 {