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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 "talk/base/asyncudpsocket.h"
-#include "talk/base/socketaddresspair.h"
-#include "talk/base/thread.h"
-#include "talk/base/socketfactory.h"
-#include "talk/base/nattypes.h"
-#include <map>
-
-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 {
- 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 {
- 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();
-
- // Packets received on one of the networks.
- void OnInternalPacket(
- const char* buf, size_t size, const SocketAddress& addr,
- AsyncPacketSocket* socket);
- void OnExternalPacket(
- const char* buf, size_t size, const SocketAddress& remote_addr,
- AsyncPacketSocket* socket);
-
-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();
-
- SocketAddressPair route;
- AsyncUDPSocket* socket;
- AddressSet* whitelist;
- };
-
- typedef std::map<SocketAddressPair,TransEntry*,RouteCmp> InternalMap;
- typedef std::map<SocketAddress,TransEntry*> ExternalMap;
-
- NAT* nat_;
- AsyncUDPSocket* server_socket_;
- SocketFactory* external_;
- SocketAddress external_ip_;
- InternalMap* int_map_;
- ExternalMap* ext_map_;
-
- /* 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 Filter(TransEntry* entry, const SocketAddress& ext_addr);
-};
-
-} // namespace talk_base
-
-#endif // TALK_BASE_NATSERVER_H__