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Implement compressible domain names

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This commit is contained in:
Miek Gieben 2012-01-11 11:19:07 +01:00
parent 974c28d1b1
commit b5d73f1eff
4 changed files with 42 additions and 40 deletions
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2
dns.go
View File

@ -173,7 +173,7 @@ type Exchange struct {
// There are many types of messages, // There are many types of messages,
// but they all share the same header. // but they all share the same header.
type RR_Header struct { type RR_Header struct {
Name string "domain-name" Name string "cdomain-name"
Rrtype uint16 Rrtype uint16
Class uint16 Class uint16
Ttl uint32 Ttl uint32

6
msg.go
View File

@ -462,7 +462,13 @@ func packStructValue(val reflect.Value, msg []byte, off int, compression map[str
copy(msg[off:off+len(b64)], b64) copy(msg[off:off+len(b64)], b64)
off += len(b64) off += len(b64)
case "domain-name": case "domain-name":
fallthrough // No compression
case "cdomain-name":
if val.Type().Field(i).Tag == "cdomain-name" {
off, ok = PackDomainName(s, msg, off, compression) off, ok = PackDomainName(s, msg, off, compression)
} else {
off, ok = PackDomainName(s, msg, off, nil)
}
if !ok { if !ok {
//fmt.Fprintf(os.Stderr, "dns: overflow packing domain-name") //fmt.Fprintf(os.Stderr, "dns: overflow packing domain-name")
return lenmsg, false return lenmsg, false

4
rawmsg.go
View File

@ -4,10 +4,6 @@
package dns package dns
import (
"fmt"
)
// Function defined in this subpackage work on []byte and but still // Function defined in this subpackage work on []byte and but still
// provide some higher level functions. // provide some higher level functions.

24
types.go
View File

@ -129,7 +129,7 @@ const (
// DNS queries. // DNS queries.
type Question struct { type Question struct {
Name string "domain-name" // "domain-name" specifies encoding Name string "cdomain-name" // "cdomain-name" specifies encoding (and may be compressed)
Qtype uint16 Qtype uint16
Qclass uint16 Qclass uint16
} }
@ -174,7 +174,7 @@ func (rr *RR_ANY) Len() int {
type RR_CNAME struct { type RR_CNAME struct {
Hdr RR_Header Hdr RR_Header
Cname string "domain-name" Cname string "cdomain-name"
} }
func (rr *RR_CNAME) Header() *RR_Header { func (rr *RR_CNAME) Header() *RR_Header {
@ -210,7 +210,7 @@ func (rr *RR_HINFO) Len() int {
type RR_MB struct { type RR_MB struct {
Hdr RR_Header Hdr RR_Header
Mb string "domain-name" Mb string "cdomain-name"
} }
func (rr *RR_MB) Header() *RR_Header { func (rr *RR_MB) Header() *RR_Header {
@ -228,7 +228,7 @@ func (rr *RR_MB) Len() int {
type RR_MG struct { type RR_MG struct {
Hdr RR_Header Hdr RR_Header
Mg string "domain-name" Mg string "cdomain-name"
} }
func (rr *RR_MG) Header() *RR_Header { func (rr *RR_MG) Header() *RR_Header {
@ -246,8 +246,8 @@ func (rr *RR_MG) Len() int {
type RR_MINFO struct { type RR_MINFO struct {
Hdr RR_Header Hdr RR_Header
Rmail string "domain-name" Rmail string "cdomain-name"
Email string "domain-name" Email string "cdomain-name"
} }
func (rr *RR_MINFO) Header() *RR_Header { func (rr *RR_MINFO) Header() *RR_Header {
@ -266,7 +266,7 @@ func (rr *RR_MINFO) Len() int {
type RR_MR struct { type RR_MR struct {
Hdr RR_Header Hdr RR_Header
Mr string "domain-name" Mr string "cdomain-name"
} }
func (rr *RR_MR) Header() *RR_Header { func (rr *RR_MR) Header() *RR_Header {
@ -285,7 +285,7 @@ func (rr *RR_MR) Len() int {
type RR_MX struct { type RR_MX struct {
Hdr RR_Header Hdr RR_Header
Pref uint16 Pref uint16
Mx string "domain-name" Mx string "cdomain-name"
} }
func (rr *RR_MX) Header() *RR_Header { func (rr *RR_MX) Header() *RR_Header {
@ -303,7 +303,7 @@ func (rr *RR_MX) Len() int {
type RR_NS struct { type RR_NS struct {
Hdr RR_Header Hdr RR_Header
Ns string "domain-name" Ns string "cdomain-name"
} }
func (rr *RR_NS) Header() *RR_Header { func (rr *RR_NS) Header() *RR_Header {
@ -321,7 +321,7 @@ func (rr *RR_NS) Len() int {
type RR_PTR struct { type RR_PTR struct {
Hdr RR_Header Hdr RR_Header
Ptr string "domain-name" Ptr string "cdomain-name"
} }
func (rr *RR_PTR) Header() *RR_Header { func (rr *RR_PTR) Header() *RR_Header {
@ -339,8 +339,8 @@ func (rr *RR_PTR) Len() int {
type RR_SOA struct { type RR_SOA struct {
Hdr RR_Header Hdr RR_Header
Ns string "domain-name" Ns string "cdomain-name"
Mbox string "domain-name" Mbox string "cdomain-name"
Serial uint32 Serial uint32
Refresh uint32 Refresh uint32
Retry uint32 Retry uint32