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// Copyright 2016 Cong Ding
//
// 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.
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)
}
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