New does help

TODO

@@ -4,6 +4,9 @@ Todo:
 * encoding NSEC3/NSEC bitmaps, DEcoding works
 * AXFR/IXFR with TSIG validation
 * Failed Xfr triggers nil error?
+* Use callback in IXFR/AXFR to make tsig happen (and other cool stuff in FunkenSturm)
+* A New for all type with some defaults filled in 
+* Take a good look at hash.Hash take over the digest sizes and names
 * HIP RR (needs list of domain names, need slice stuff for that)
 
 Issues:

dns.go

@@ -23,6 +23,7 @@ const (
 	Year68         = 2 << (32 - 1) // For RFC1982 (Serial Arithmetic) calculations in 32 bits.
 	DefaultMsgSize = 4096          // A standard default for larger than 512 packets.
 	MaxMsgSize     = 65536         // Largest possible DNS packet.
+	DefaultTtl     = 3600          // Default Ttl, used in New() for instance.
 )
 
 // Error represents a DNS error

new.go

@@ -0,0 +1,28 @@
+package dns
+
+func New(i int) RR {
+        var rr RR
+        mk, known := rr_mk[i]
+        if !known {
+                rr = new(RR_RFC3597)
+        } else {
+                rr = mk()
+        }
+
+        switch t := rr.(type) {
+        case *RR_RFC3597:
+                t.Hdr = RR_Header{Ttl: DefaultTtl, Class: ClassINET, Rrtype: uint16(i)}
+        case *RR_TSIG:
+                t.Hdr = RR_Header{Ttl: 0, Class: ClassANY, Rrtype: uint16(i)}
+                t.Fudge = 300
+        case *RR_OPT:
+                t.Hdr = RR_Header{Name: "", Ttl: 0, Class: 0, Rrtype: uint16(i)}
+                t.SetVersion(0)
+                t.SetUDPSize(DefaultMsgSize)
+        case *RR_A:
+                t.Hdr = RR_Header{Ttl: DefaultTtl, Class: ClassINET, Rrtype: uint16(i)}
+        case *RR_AAAA:
+                t.Hdr = RR_Header{Ttl: DefaultTtl, Class: ClassINET, Rrtype: uint16(i)}
+        }
+        return rr
+}

resolver.go

@@ -219,7 +219,9 @@ Server:
 // returned over the channel, so the caller will receive 
 // the zone as-is. Xfr.Add is always true.
 // The channel is closed to signal the end of the AXFR.
-func (res *Resolver) Axfr(q *Msg, m chan Xfr) {
+// f is a callback function called after every message has been
+// received.
+func (res *Resolver) Axfr(q *Msg, m chan Xfr, f func(*Msg) bool) {
 	var port string
 	var in *Msg
 	if res.Port == "" {