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