tcptunnel.cpp
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#include <string.h>
#include <sstream>
#include <iostream>
#include <thread>
#include <list>
#include <chrono>
#include <future>
#include <memory>
#include <utility>
#include "config.h"
#include "socket.h"
const int MESSAGE_BUFFER = 8096;
void threadManager(std::list<std::pair<std::shared_ptr<std::atomic<bool>>, std::unique_ptr<std::thread>>> & threads)
{
std::cout << "iniciei gerenciador de threads" << std::endl;
while(true)
{
std::this_thread::sleep_for(std::chrono::seconds(30));
std::cout << "realizando limpeza das threads (size = " << threads.size() << ")" << std::endl;
int i = 0;
std::list<std::pair<std::shared_ptr<std::atomic<bool>>, std::unique_ptr<std::thread>>>::iterator it;
for(it = threads.begin(); it != threads.end(); ++i)
{
if ((*(it->first)))
{
(it->first).reset();
(it->second)->join();
(it->second).reset();
it = threads.erase(it);
// std::cout << "removi thread inutilizada " << (i+1) << std::endl;
}
else
{
++it;
}
}
}
}
void tunnelingTask(std::unique_ptr<lemoce::ClientSocket> server_ptr,
std::unique_ptr<lemoce::ClientSocket> client_ptr,
std::unique_ptr<char []> buffer,
std::shared_ptr<std::atomic<bool>> done)
{
lemoce::ClientSocket server = *server_ptr;
lemoce::ClientSocket client = *client_ptr;
char * charbuf;
charbuf = static_cast<char *>(buffer.get());
try
{
std::cout << "iniciei thread de tunneling" << std::endl;
while(!server.isClosed())
{
int len = client.read(charbuf, MESSAGE_BUFFER);
if (len == 0)
{
server.close();
client.close();
break;
}
//std::cout << " ==> " << buffer << std::endl;
server.write(charbuf, len);
// std::cout << (*tmpMessage) << " ==>" << std::endl;
len = server.read(charbuf, MESSAGE_BUFFER);
if (len == 0)
{
server.close();
client.close();
break;
}
//std::cout << buffer << " <==" << std::endl;
client.write(charbuf, len);
}
}
catch (lemoce::SocketException & ex)
{
server.close();
client.close();
}
std::cout << "terminei a thread" << std::endl;
(*done) = true;
}
int main(int argc, char *argv[])
{
if (argc != 4)
{
std::cout << "uso errado" << std::endl;
return -1;
}
std::istringstream listenPortStream{argv[1]};
std::istringstream connectPortStream{argv[3]};
int MAX_BUFFER = 8192;
int listeningPort, remotePort;
listenPortStream >> listeningPort;
connectPortStream >> remotePort;
std::string remoteHost{argv[2]};
try
{
lemoce::ServerSocket server{listeningPort};
server.listen();
std::list<
std::pair<std::shared_ptr<std::atomic<bool>>,
std::unique_ptr<std::thread>>> threads;
std::thread manager{threadManager, std::ref(threads)};
for (;;)
{
std::unique_ptr<lemoce::ClientSocket> client_ptr{new lemoce::ClientSocket{}};
std::unique_ptr<lemoce::ClientSocket> remoteClient_ptr;
std::unique_ptr<char []> buffer{new char[MESSAGE_BUFFER]};
try
{
server.accept((*client_ptr));
remoteClient_ptr.reset(new lemoce::ClientSocket{remoteHost, remotePort});
(*remoteClient_ptr).connect();
std::cout << "conectei com o servidor remoto" << std::endl;
}
catch (lemoce::SocketException & ex)
{
if (ex.getErrno() == EINTR)
{
(*remoteClient_ptr).close();
std::cout << "fechei conexao pela excecao de interrupcao" << std::endl;
continue;
}
else
{
throw ex;
}
}
std::shared_ptr<std::atomic<bool>> done{new std::atomic<bool>(false)};
std::unique_ptr<std::thread> thread{new std::thread
{
tunnelingTask, std::move(remoteClient_ptr),
std::move(client_ptr),
std::move(buffer),
done
}};
threads.push_back(std::make_pair(done, std::move(thread)));
}
}
catch (lemoce::SocketException & ex)
{
std::cout << ex.getMessage() << std::endl;
}
return 0;
}