Some documentation fixes and origid is not needed in tsig

defaults.go

@@ -82,15 +82,14 @@ func (dns *Msg) SetAxfr(z string) {
 
 // SetTsig appends a TSIG RR to the message.
 // This is only a skeleton Tsig RR that is added as the last RR in the 
-// additional section. The Tsig is calculated when the message is being
-// send.
-func (dns *Msg) SetTsig(z, algo string, fudge, origid uint16, timesigned int64) {
+// additional section. The Tsig is calculated when the message is being send.
+func (dns *Msg) SetTsig(z, algo string, fudge, timesigned int64) {
 	t := new(RR_TSIG)
 	t.Hdr = RR_Header{z, TypeTSIG, ClassANY, 0, 0}
 	t.Algorithm = algo
 	t.Fudge = 300
 	t.TimeSigned = uint64(timesigned)
-	t.OrigId = origid
+	t.OrigId = dns.MsgHdr.Id
 	dns.Extra = append(dns.Extra, t)
 }
 

ex/axfr/axfr.go

@@ -27,7 +27,7 @@ func main() {
 		a := strings.SplitN(*tsig, ":", 2)
 		name, secret := a[0], a[1]
 		client.TsigSecret = map[string]string{name: secret}
-		m.SetTsig(name, dns.HmacMD5, 300, m.MsgHdr.Id, time.Now().Unix())
+		m.SetTsig(name, dns.HmacMD5, 300, time.Now().Unix())
 	}
 
 	if t, e := client.XfrReceive(m, *nameserver); e == nil {

tsig.go

@@ -24,7 +24,8 @@
 //	m := new(dns.Msg)
 //	m.SetAxfr("miek.nl.") 
 //	m.SetTsig("axfr.", dns.HmacMD5, 300, time.Now().Unix())
-//	err := c.XfrReceive(m, "85.223.71.124:53")
+//	t, err := c.XfrReceive(m, "85.223.71.124:53")
+//	for r := range t { /* ... */ }
 //
 // You can now read the records from the AXFR as they come in. Each envelope is checked with TSIG.
 // If something is not correct an error is returned.
@@ -39,7 +40,7 @@
 //		if r.IsTsig() {
 //			if w.TsigStatus() == nil {
 //				// *Msg r has an TSIG record and it was validated
-//				m.SetTsig("axfr.", dns.HmacMD5, 300, r.MsgHdr.Id, time.Now().Unix())
+//				m.SetTsig("axfr.", dns.HmacMD5, 300, time.Now().Unix())
 //			} else {
 //				// *Msg r has an TSIG records and it was not valided
 //			}