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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 TALK_BASE_NATSERVER_H_
#define TALK_BASE_NATSERVER_H_
#include <map>
#include <set>
#include "talk/base/asyncudpsocket.h"
#include "talk/base/socketaddresspair.h"
#include "talk/base/thread.h"
#include "talk/base/socketfactory.h"
#include "talk/base/nattypes.h"
namespace talk_base {
// Change how routes (socketaddress pairs) are compared based on the type of
// NAT. The NAT server maintains a hashtable of the routes that it knows
// about. So these affect which routes are treated the same.
struct RouteCmp {
explicit RouteCmp(NAT* nat);
size_t operator()(const SocketAddressPair& r) const;
bool operator()(
const SocketAddressPair& r1, const SocketAddressPair& r2) const;
bool symmetric;
};
// Changes how addresses are compared based on the filtering rules of the NAT.
struct AddrCmp {
explicit AddrCmp(NAT* nat);
size_t operator()(const SocketAddress& r) const;
bool operator()(const SocketAddress& r1, const SocketAddress& r2) const;
bool use_ip;
bool use_port;
};
// Implements the NAT device. It listens for packets on the internal network,
// translates them, and sends them out over the external network.
const int NAT_SERVER_PORT = 4237;
class NATServer : public sigslot::has_slots<> {
public:
NATServer(
NATType type, SocketFactory* internal, const SocketAddress& internal_addr,
SocketFactory* external, const SocketAddress& external_ip);
~NATServer();
SocketAddress internal_address() const {
return server_socket_->GetLocalAddress();
}
// Packets received on one of the networks.
void OnInternalPacket(AsyncPacketSocket* socket, const char* buf,
size_t size, const SocketAddress& addr,
const PacketTime& packet_time);
void OnExternalPacket(AsyncPacketSocket* socket, const char* buf,
size_t size, const SocketAddress& remote_addr,
const PacketTime& packet_time);
private:
typedef std::set<SocketAddress, AddrCmp> AddressSet;
/* Records a translation and the associated external socket. */
struct TransEntry {
TransEntry(const SocketAddressPair& r, AsyncUDPSocket* s, NAT* nat);
~TransEntry();
void WhitelistInsert(const SocketAddress& addr);
bool WhitelistContains(const SocketAddress& ext_addr);
SocketAddressPair route;
AsyncUDPSocket* socket;
AddressSet* whitelist;
CriticalSection crit_;
};
typedef std::map<SocketAddressPair, TransEntry*, RouteCmp> InternalMap;
typedef std::map<SocketAddress, TransEntry*> ExternalMap;
/* Creates a new entry that translates the given route. */
void Translate(const SocketAddressPair& route);
/* Determines whether the NAT would filter out a packet from this address. */
bool ShouldFilterOut(TransEntry* entry, const SocketAddress& ext_addr);
NAT* nat_;
SocketFactory* internal_;
SocketFactory* external_;
SocketAddress external_ip_;
AsyncUDPSocket* server_socket_;
AsyncSocket* tcp_server_socket_;
InternalMap* int_map_;
ExternalMap* ext_map_;
DISALLOW_EVIL_CONSTRUCTORS(NATServer);
};
} // namespace talk_base
#endif // TALK_BASE_NATSERVER_H_
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