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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "p2p/test/stun_server.h"
#include <memory>
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "api/sequence_checker.h"
#include "api/transport/stun.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/async_udp_socket.h"
#include "rtc_base/byte_buffer.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/network/received_packet.h"
#include "rtc_base/socket_address.h"
namespace webrtc {
StunServer::StunServer(AsyncUDPSocket* socket) : socket_(socket) {
socket_->RegisterReceivedPacketCallback(
[&](rtc::AsyncPacketSocket* socket, const rtc::ReceivedPacket& packet) {
OnPacket(socket, packet);
});
}
StunServer::~StunServer() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
socket_->DeregisterReceivedPacketCallback();
}
void StunServer::OnPacket(AsyncPacketSocket* socket,
const rtc::ReceivedPacket& packet) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
// Parse the STUN message; eat any messages that fail to parse.
rtc::ByteBufferReader bbuf(packet.payload());
cricket::StunMessage msg;
if (!msg.Read(&bbuf)) {
return;
}
// TODO(?): If unknown non-optional (<= 0x7fff) attributes are found,
// send a
// 420 "Unknown Attribute" response.
// Send the message to the appropriate handler function.
switch (msg.type()) {
case cricket::STUN_BINDING_REQUEST:
OnBindingRequest(&msg, packet.source_address());
break;
default:
SendErrorResponse(msg, packet.source_address(), 600,
"Operation Not Supported");
}
}
void StunServer::OnBindingRequest(cricket::StunMessage* msg,
const SocketAddress& remote_addr) {
cricket::StunMessage response(cricket::STUN_BINDING_RESPONSE,
msg->transaction_id());
GetStunBindResponse(msg, remote_addr, &response);
SendResponse(response, remote_addr);
}
void StunServer::SendErrorResponse(const cricket::StunMessage& msg,
const SocketAddress& addr,
int error_code,
absl::string_view error_desc) {
cricket::StunMessage err_msg(cricket::GetStunErrorResponseType(msg.type()),
msg.transaction_id());
auto err_code = cricket::StunAttribute::CreateErrorCode();
err_code->SetCode(error_code);
err_code->SetReason(std::string(error_desc));
err_msg.AddAttribute(std::move(err_code));
SendResponse(err_msg, addr);
}
void StunServer::SendResponse(const cricket::StunMessage& msg,
const SocketAddress& addr) {
rtc::ByteBufferWriter buf;
msg.Write(&buf);
rtc::PacketOptions options;
if (socket_->SendTo(buf.Data(), buf.Length(), addr, options) < 0)
RTC_LOG_ERR(LS_ERROR) << "sendto";
}
void StunServer::GetStunBindResponse(cricket::StunMessage* message,
const SocketAddress& remote_addr,
cricket::StunMessage* response) const {
RTC_DCHECK_EQ(response->type(), cricket::STUN_BINDING_RESPONSE);
RTC_DCHECK_EQ(response->transaction_id(), message->transaction_id());
// Tell the user the address that we received their message from.
std::unique_ptr<cricket::StunAddressAttribute> mapped_addr;
if (message->IsLegacy()) {
mapped_addr = cricket::StunAttribute::CreateAddress(
cricket::STUN_ATTR_MAPPED_ADDRESS);
} else {
mapped_addr = cricket::StunAttribute::CreateXorAddress(
cricket::STUN_ATTR_XOR_MAPPED_ADDRESS);
}
mapped_addr->SetAddress(remote_addr);
response->AddAttribute(std::move(mapped_addr));
}
} // namespace webrtc