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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_NATSOCKETFACTORY_H_
#define TALK_BASE_NATSOCKETFACTORY_H_
#include <string>
#include <map>
#include <set>
#include "talk/base/natserver.h"
#include "talk/base/socketaddress.h"
#include "talk/base/socketserver.h"
namespace talk_base {
const size_t kNATEncodedIPv4AddressSize = 8U;
const size_t kNATEncodedIPv6AddressSize = 20U;
// Used by the NAT socket implementation.
class NATInternalSocketFactory {
public:
virtual ~NATInternalSocketFactory() {}
virtual AsyncSocket* CreateInternalSocket(int family, int type,
const SocketAddress& local_addr, SocketAddress* nat_addr) = 0;
};
// Creates sockets that will send all traffic through a NAT, using an existing
// NATServer instance running at nat_addr. The actual data is sent using sockets
// from a socket factory, given to the constructor.
class NATSocketFactory : public SocketFactory, public NATInternalSocketFactory {
public:
NATSocketFactory(SocketFactory* factory, const SocketAddress& nat_addr);
// SocketFactory implementation
virtual Socket* CreateSocket(int type);
virtual Socket* CreateSocket(int family, int type);
virtual AsyncSocket* CreateAsyncSocket(int type);
virtual AsyncSocket* CreateAsyncSocket(int family, int type);
// NATInternalSocketFactory implementation
virtual AsyncSocket* CreateInternalSocket(int family, int type,
const SocketAddress& local_addr, SocketAddress* nat_addr);
private:
SocketFactory* factory_;
SocketAddress nat_addr_;
DISALLOW_EVIL_CONSTRUCTORS(NATSocketFactory);
};
// Creates sockets that will send traffic through a NAT depending on what
// address they bind to. This can be used to simulate a client on a NAT sending
// to a client that is not behind a NAT.
// Note that the internal addresses of clients must be unique. This is because
// there is only one socketserver per thread, and the Bind() address is used to
// figure out which NAT (if any) the socket should talk to.
//
// Example with 3 NATs (2 cascaded), and 3 clients.
// ss->AddTranslator("1.2.3.4", "192.168.0.1", NAT_ADDR_RESTRICTED);
// ss->AddTranslator("99.99.99.99", "10.0.0.1", NAT_SYMMETRIC)->
// AddTranslator("10.0.0.2", "192.168.1.1", NAT_OPEN_CONE);
// ss->GetTranslator("1.2.3.4")->AddClient("1.2.3.4", "192.168.0.2");
// ss->GetTranslator("99.99.99.99")->AddClient("10.0.0.3");
// ss->GetTranslator("99.99.99.99")->GetTranslator("10.0.0.2")->
// AddClient("192.168.1.2");
class NATSocketServer : public SocketServer, public NATInternalSocketFactory {
public:
class Translator;
// holds a list of NATs
class TranslatorMap : private std::map<SocketAddress, Translator*> {
public:
~TranslatorMap();
Translator* Get(const SocketAddress& ext_ip);
Translator* Add(const SocketAddress& ext_ip, Translator*);
void Remove(const SocketAddress& ext_ip);
Translator* FindClient(const SocketAddress& int_ip);
};
// a specific NAT
class Translator {
public:
Translator(NATSocketServer* server, NATType type,
const SocketAddress& int_addr, SocketFactory* ext_factory,
const SocketAddress& ext_addr);
SocketFactory* internal_factory() { return internal_factory_.get(); }
SocketAddress internal_address() const {
return nat_server_->internal_address();
}
SocketAddress internal_tcp_address() const {
return SocketAddress(); // nat_server_->internal_tcp_address();
}
Translator* GetTranslator(const SocketAddress& ext_ip);
Translator* AddTranslator(const SocketAddress& ext_ip,
const SocketAddress& int_ip, NATType type);
void RemoveTranslator(const SocketAddress& ext_ip);
bool AddClient(const SocketAddress& int_ip);
void RemoveClient(const SocketAddress& int_ip);
// Looks for the specified client in this or a child NAT.
Translator* FindClient(const SocketAddress& int_ip);
private:
NATSocketServer* server_;
scoped_ptr<SocketFactory> internal_factory_;
scoped_ptr<NATServer> nat_server_;
TranslatorMap nats_;
std::set<SocketAddress> clients_;
};
explicit NATSocketServer(SocketServer* ss);
SocketServer* socketserver() { return server_; }
MessageQueue* queue() { return msg_queue_; }
Translator* GetTranslator(const SocketAddress& ext_ip);
Translator* AddTranslator(const SocketAddress& ext_ip,
const SocketAddress& int_ip, NATType type);
void RemoveTranslator(const SocketAddress& ext_ip);
// SocketServer implementation
virtual Socket* CreateSocket(int type);
virtual Socket* CreateSocket(int family, int type);
virtual AsyncSocket* CreateAsyncSocket(int type);
virtual AsyncSocket* CreateAsyncSocket(int family, int type);
virtual void SetMessageQueue(MessageQueue* queue) {
msg_queue_ = queue;
server_->SetMessageQueue(queue);
}
virtual bool Wait(int cms, bool process_io) {
return server_->Wait(cms, process_io);
}
virtual void WakeUp() {
server_->WakeUp();
}
// NATInternalSocketFactory implementation
virtual AsyncSocket* CreateInternalSocket(int family, int type,
const SocketAddress& local_addr, SocketAddress* nat_addr);
private:
SocketServer* server_;
MessageQueue* msg_queue_;
TranslatorMap nats_;
DISALLOW_EVIL_CONSTRUCTORS(NATSocketServer);
};
// Free-standing NAT helper functions.
size_t PackAddressForNAT(char* buf, size_t buf_size,
const SocketAddress& remote_addr);
size_t UnpackAddressFromNAT(const char* buf, size_t buf_size,
SocketAddress* remote_addr);
} // namespace talk_base
#endif // TALK_BASE_NATSOCKETFACTORY_H_
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