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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.
*/
#ifndef P2P_BASE_STUN_SERVER_H_
#define P2P_BASE_STUN_SERVER_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "absl/strings/string_view.h"
#include "api/transport/stun.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/async_udp_socket.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/third_party/sigslot/sigslot.h"
namespace cricket {
const int STUN_SERVER_PORT = 3478;
class StunServer : public sigslot::has_slots<> {
public:
// Creates a STUN server, which will listen on the given socket.
explicit StunServer(rtc::AsyncUDPSocket* socket);
// Removes the STUN server from the socket and deletes the socket.
~StunServer() override;
protected:
// Slot for Socket.PacketRead:
void OnPacket(rtc::AsyncPacketSocket* socket,
const char* buf,
size_t size,
const rtc::SocketAddress& remote_addr,
const int64_t& packet_time_us);
// Handlers for the different types of STUN/TURN requests:
virtual void OnBindingRequest(StunMessage* msg,
const rtc::SocketAddress& addr);
void OnAllocateRequest(StunMessage* msg, const rtc::SocketAddress& addr);
void OnSharedSecretRequest(StunMessage* msg, const rtc::SocketAddress& addr);
void OnSendRequest(StunMessage* msg, const rtc::SocketAddress& addr);
// Sends an error response to the given message back to the user.
void SendErrorResponse(const StunMessage& msg,
const rtc::SocketAddress& addr,
int error_code,
absl::string_view error_desc);
// Sends the given message to the appropriate destination.
void SendResponse(const StunMessage& msg, const rtc::SocketAddress& addr);
// A helper method to compose a STUN binding response.
void GetStunBindResponse(StunMessage* message,
const rtc::SocketAddress& remote_addr,
StunMessage* response) const;
private:
std::unique_ptr<rtc::AsyncUDPSocket> socket_;
};
} // namespace cricket
#endif // P2P_BASE_STUN_SERVER_H_
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