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Be much more inline with the spec for the edns subnet

This commit is contained in:
Miek Gieben 2013-01-27 14:47:47 +01:00
parent 2a34616419
commit eb28b618cb
1 changed files with 18 additions and 7 deletions
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25
edns.go
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@ -248,7 +248,8 @@ func (e *EDNS0_SUBNET) pack() ([]byte, error) {
}
func (e *EDNS0_SUBNET) unpack(b []byte) {
if len(b) < 8 {
lb := len(b)
if lb < 4 {
return
}
e.Family, _ = unpackUint16(b, 0)
@ -256,15 +257,25 @@ func (e *EDNS0_SUBNET) unpack(b []byte) {
e.SourceScope = b[3]
switch e.Family {
case 1:
if len(b) == 8 {
e.Address = net.IPv4(b[4], b[5], b[6], b[7])
addr := make([]byte, 4)
for i := 0; i < int(e.SourceNetmask/8); i++ {
if 4+i > len(b) {
break
}
addr[i] = b[4+i]
}
e.Address = net.IPv4(addr[0], addr[1], addr[2], addr[3])
case 2:
if len(b) == 20 {
e.Address = net.IP{b[4], b[4+1], b[4+2], b[4+3], b[4+4],
b[4+5], b[4+6], b[4+7], b[4+8], b[4+9], b[4+10],
b[4+11], b[4+12], b[4+13], b[4+14], b[4+15]}
addr := make([]byte, 16)
for i := 0; i < int(e.SourceNetmask/8); i++ {
if 4+i > len(b) {
break
}
addr[i] = b[4+i]
}
e.Address = net.IP{addr[0], addr[1], addr[2], addr[3], addr[4],
addr[5], addr[6], addr[7], addr[8], addr[9], addr[10],
addr[11], addr[12], addr[13], addr[14], addr[15]}
}
return
}