Function msgToSignature

proxy/recursiondetector.go:86–97

msgToSignature converts msg into it's signature represented in bytes.

(msg *dns.Msg)

// msgToSignature converts msg into it's signature represented in bytes.
func msgToSignature(msg *dns.Msg) (sig []byte) {
	sig = make([]byte, uint16sz*2+netutil.MaxDomainNameLen)
	// The binary.BigEndian byte order is used everywhere except when the real
	// machine's endianness is needed.
	byteOrder := binary.BigEndian
	byteOrder.PutUint16(sig[0:], msg.Id)
	q := msg.Question[0]
	byteOrder.PutUint16(sig[uint16sz:], q.Qtype)
	copy(sig[2*uint16sz:], []byte(q.Name))

	return sig
}