105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "p2p/base/stun_server.h"
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#include <string>
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#include <utility>
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#include "absl/strings/string_view.h"
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#include "rtc_base/byte_buffer.h"
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#include "rtc_base/logging.h"
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namespace cricket {
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StunServer::StunServer(rtc::AsyncUDPSocket* socket) : socket_(socket) {
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socket_->SignalReadPacket.connect(this, &StunServer::OnPacket);
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}
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StunServer::~StunServer() {
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socket_->SignalReadPacket.disconnect(this);
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}
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void StunServer::OnPacket(rtc::AsyncPacketSocket* socket,
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const char* buf,
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size_t size,
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const rtc::SocketAddress& remote_addr,
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const int64_t& /* packet_time_us */) {
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// Parse the STUN message; eat any messages that fail to parse.
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rtc::ByteBufferReader bbuf(buf, size);
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StunMessage msg;
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if (!msg.Read(&bbuf)) {
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return;
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}
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// TODO(?): If unknown non-optional (<= 0x7fff) attributes are found, send a
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// 420 "Unknown Attribute" response.
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// Send the message to the appropriate handler function.
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switch (msg.type()) {
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case STUN_BINDING_REQUEST:
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OnBindingRequest(&msg, remote_addr);
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break;
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default:
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SendErrorResponse(msg, remote_addr, 600, "Operation Not Supported");
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}
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}
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void StunServer::OnBindingRequest(StunMessage* msg,
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const rtc::SocketAddress& remote_addr) {
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StunMessage response(STUN_BINDING_RESPONSE, msg->transaction_id());
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GetStunBindResponse(msg, remote_addr, &response);
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SendResponse(response, remote_addr);
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}
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void StunServer::SendErrorResponse(const StunMessage& msg,
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const rtc::SocketAddress& addr,
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int error_code,
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absl::string_view error_desc) {
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StunMessage err_msg(GetStunErrorResponseType(msg.type()),
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msg.transaction_id());
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auto err_code = StunAttribute::CreateErrorCode();
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err_code->SetCode(error_code);
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err_code->SetReason(std::string(error_desc));
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err_msg.AddAttribute(std::move(err_code));
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SendResponse(err_msg, addr);
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}
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void StunServer::SendResponse(const StunMessage& msg,
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const rtc::SocketAddress& addr) {
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rtc::ByteBufferWriter buf;
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msg.Write(&buf);
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rtc::PacketOptions options;
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if (socket_->SendTo(buf.Data(), buf.Length(), addr, options) < 0)
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RTC_LOG_ERR(LS_ERROR) << "sendto";
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}
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void StunServer::GetStunBindResponse(StunMessage* message,
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const rtc::SocketAddress& remote_addr,
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StunMessage* response) const {
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RTC_DCHECK_EQ(response->type(), STUN_BINDING_RESPONSE);
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RTC_DCHECK_EQ(response->transaction_id(), message->transaction_id());
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// Tell the user the address that we received their message from.
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std::unique_ptr<StunAddressAttribute> mapped_addr;
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if (message->IsLegacy()) {
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mapped_addr = StunAttribute::CreateAddress(STUN_ATTR_MAPPED_ADDRESS);
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} else {
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mapped_addr = StunAttribute::CreateXorAddress(STUN_ATTR_XOR_MAPPED_ADDRESS);
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}
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mapped_addr->SetAddress(remote_addr);
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response->AddAttribute(std::move(mapped_addr));
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}
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} // namespace cricket
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