Vender add

vender/github.com/ccding/go-stun/stun/response.go

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+// Copyright 2016, Cong Ding. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: Cong Ding <dinggnu@gmail.com>
+
+package stun
+
+import (
+	"fmt"
+	"net"
+)
+
+type response struct {
+	packet      *packet // the original packet from the server
+	serverAddr  *Host   // the address received packet
+	changedAddr *Host   // parsed from packet
+	mappedAddr  *Host   // parsed from packet, external addr of client NAT
+	otherAddr   *Host   // parsed from packet, to replace changedAddr in RFC 5780
+	identical   bool    // if mappedAddr is in local addr list
+}
+
+func newResponse(pkt *packet, conn net.PacketConn) *response {
+	resp := &response{pkt, nil, nil, nil, nil, false}
+	if pkt == nil {
+		return resp
+	}
+	// RFC 3489 doesn't require the server return XOR mapped address.
+	mappedAddr := pkt.getXorMappedAddr()
+	if mappedAddr == nil {
+		mappedAddr = pkt.getMappedAddr()
+	}
+	resp.mappedAddr = mappedAddr
+	// compute identical
+	localAddrStr := conn.LocalAddr().String()
+	if mappedAddr != nil {
+		mappedAddrStr := mappedAddr.String()
+		resp.identical = isLocalAddress(localAddrStr, mappedAddrStr)
+	}
+	// compute changedAddr
+	changedAddr := pkt.getChangedAddr()
+	if changedAddr != nil {
+		changedAddrHost := newHostFromStr(changedAddr.String())
+		resp.changedAddr = changedAddrHost
+	}
+	// compute otherAddr
+	otherAddr := pkt.getOtherAddr()
+	if otherAddr != nil {
+		otherAddrHost := newHostFromStr(otherAddr.String())
+		resp.otherAddr = otherAddrHost
+	}
+
+	return resp
+}
+
+// String is only used for verbose mode output.
+func (r *response) String() string {
+	if r == nil {
+		return "Nil"
+	}
+	return fmt.Sprintf("{packet nil: %v, local: %v, remote: %v, changed: %v, other: %v, identical: %v}",
+		r.packet == nil,
+		r.mappedAddr,
+		r.serverAddr,
+		r.changedAddr,
+		r.otherAddr,
+		r.identical)
+}