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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __RELAYSERVER_H__
#define __RELAYSERVER_H__
#include "talk/base/asyncudpsocket.h"
#include "talk/base/socketaddresspair.h"
#include "talk/base/thread.h"
#include "talk/base/jtime.h"
#include "talk/p2p/base/stun.h"
#include <string>
#include <vector>
#include <map>
namespace cricket {
class RelayServerBinding;
class RelayServerConnection;
// Relays traffic between connections to the server that are "bound" together.
// All connections created with the same username/password are bound together.
class RelayServer : public sigslot::has_slots<> {
public:
// Creates a server, which will use this thread to post messages to itself.
RelayServer(Thread* thread);
~RelayServer();
Thread* thread() { return thread_; }
// Updates the set of sockets that the server uses to talk to "internal"
// clients. These are clients that do the "port allocations".
void AddInternalSocket(AsyncPacketSocket* socket);
void RemoveInternalSocket(AsyncPacketSocket* socket);
// Updates the set of sockets that the server uses to talk to "external"
// clients. These are the clients that do not do allocations. They do not
// know that these addresses represent a relay server.
void AddExternalSocket(AsyncPacketSocket* socket);
void RemoveExternalSocket(AsyncPacketSocket* socket);
private:
typedef std::vector<AsyncPacketSocket*> SocketList;
typedef std::map<std::string,RelayServerBinding*> BindingMap;
typedef std::map<SocketAddressPair,RelayServerConnection*> ConnectionMap;
Thread* thread_;
SocketList internal_sockets_;
SocketList external_sockets_;
BindingMap bindings_;
ConnectionMap connections_;
// Called when a packet is received by the server on one of its sockets.
void OnInternalPacket(
const char* bytes, size_t size, const SocketAddress& remote_addr,
AsyncPacketSocket* socket);
void OnExternalPacket(
const char* bytes, size_t size, const SocketAddress& remote_addr,
AsyncPacketSocket* socket);
// Processes the relevant STUN request types from the client.
bool HandleStun(const char* bytes, size_t size,
const SocketAddress& remote_addr, AsyncPacketSocket* socket,
std::string* username, StunMessage* msg);
void HandleStunAllocate(const char* bytes, size_t size,
const SocketAddressPair& ap,
AsyncPacketSocket* socket);
void HandleStun(RelayServerConnection* int_conn, const char* bytes,
size_t size);
void HandleStunAllocate(RelayServerConnection* int_conn,
const StunMessage& msg);
void HandleStunSend(RelayServerConnection* int_conn, const StunMessage& msg);
// Adds/Removes the a connection or binding.
void AddConnection(RelayServerConnection* conn);
void RemoveConnection(RelayServerConnection* conn);
void RemoveBinding(RelayServerBinding* binding);
// Called when the timer for checking lifetime times out.
void OnTimeout(RelayServerBinding* binding);
friend class RelayServerConnection;
friend class RelayServerBinding;
};
// Maintains information about a connection to the server. Each connection is
// part of one and only one binding.
class RelayServerConnection {
public:
RelayServerConnection(RelayServerBinding* binding,
const SocketAddressPair& addrs,
AsyncPacketSocket* socket);
~RelayServerConnection();
RelayServerBinding* binding() { return binding_; }
AsyncPacketSocket* socket() { return socket_; }
// Returns a pair where the source is the remote address and the destination
// is the local address.
const SocketAddressPair& addr_pair() { return addr_pair_; }
// Sends a packet to the connected client. If an address is provided, then
// we make sure the internal client receives it, wrapping if necessary.
void Send(const char* data, size_t size);
void Send(const char* data, size_t size, const SocketAddress& ext_addr);
// Sends a STUN message to the connected client with no wrapping.
void SendStun(const StunMessage& msg);
void SendStunError(const StunMessage& request, int code, const char* desc);
// A locked connection is one for which we know the intended destination of
// any raw packet received.
bool locked() const { return locked_; }
void Lock();
void Unlock();
// Records the address that raw packets should be forwarded to (for internal
// packets only; for external, we already know where they go).
const SocketAddress& default_destination() const { return default_dest_; }
void set_default_destination(const SocketAddress& addr) {
default_dest_ = addr;
}
private:
RelayServerBinding* binding_;
SocketAddressPair addr_pair_;
AsyncPacketSocket* socket_;
bool locked_;
SocketAddress default_dest_;
};
// Records a set of internal and external connections that we relay between,
// or in other words, that are "bound" together.
class RelayServerBinding : public MessageHandler {
public:
RelayServerBinding(
RelayServer* server, const std::string& username,
const std::string& password, uint32 lifetime);
virtual ~RelayServerBinding();
RelayServer* server() { return server_; }
uint32 lifetime() { return lifetime_; }
const std::string& username() { return username_; }
const std::string& password() { return password_; }
const std::string& magic_cookie() { return magic_cookie_; }
// Adds/Removes a connection into the binding.
void AddInternalConnection(RelayServerConnection* conn);
void AddExternalConnection(RelayServerConnection* conn);
// We keep track of the use of each binding. If we detect that it was not
// used for longer than the lifetime, then we send a signal.
void NoteUsed();
sigslot::signal1<RelayServerBinding*> SignalTimeout;
// Determines whether the given packet has the magic cookie present (in the
// right place).
bool HasMagicCookie(const char* bytes, size_t size) const;
// Determines the connection to use to send packets to or from the given
// external address.
RelayServerConnection* GetInternalConnection(const SocketAddress& ext_addr);
RelayServerConnection* GetExternalConnection(const SocketAddress& ext_addr);
// MessageHandler:
void OnMessage(Message *pmsg);
private:
RelayServer* server_;
std::string username_;
std::string password_;
std::string magic_cookie_;
std::vector<RelayServerConnection*> internal_connections_;
std::vector<RelayServerConnection*> external_connections_;
uint32 lifetime_;
uint32 last_used_;
// TODO: bandwidth
};
} // namespace cricket
#endif // __RELAYSERVER_H__
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