// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER 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 _ABSTRACT_TCP_SERVER_H_
#define _ABSTRACT_TCP_SERVER_H_
#include <process.h>
#include <list>
#include <winsock2.h>
#include "winobj.h"
//#include "threads_helper.h"
#include "net_utils_base.h"
#pragma comment(lib, "Ws2_32.lib")
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net"
namespace epee
{
namespace net_utils
{
/************************************************************************/
/* */
/************************************************************************/
class soket_sender: public i_service_endpoint
{
public:
soket_sender(SOCKET sock):m_sock(sock){}
private:
virtual bool handle_send(const void* ptr, size_t cb)
{
if(cb != send(m_sock, (char*)ptr, (int)cb, 0))
{
int sock_err = WSAGetLastError();
LOG_ERROR("soket_sender: Failed to send " << cb << " bytes, Error=" << sock_err);
return false;
}
return true;
}
SOCKET m_sock;
};
/************************************************************************/
/* */
/************************************************************************/
template<class THandler>
class abstract_tcp_server
{
public:
abstract_tcp_server();
bool init_server(int port_no);
bool deinit_server();
bool run_server();
bool send_stop_signal();
typename THandler::config_type& get_config_object(){return m_config;}
private:
bool invoke_connection(SOCKET hnew_sock, long ip_from, int post_from);
static unsigned __stdcall ConnectionHandlerProc(void* lpParameter);
class thread_context;
typedef std::list<thread_context> connections_container;
typedef typename connections_container::iterator connections_iterator;
struct thread_context
{
HANDLE m_htread;
SOCKET m_socket;
abstract_tcp_server* powner;
connection_context m_context;
typename connections_iterator m_self_it;
};
SOCKET m_listen_socket;
int m_port;
bool m_initialized;
volatile LONG m_stop_server;
volatile LONG m_threads_count;
typename THandler::config_type m_config;
connections_container m_connections;
critical_section m_connections_lock;
};
template<class THandler>
unsigned __stdcall abstract_tcp_server<THandler>::ConnectionHandlerProc(void* lpParameter)
{
thread_context* pthread_context = (thread_context*)lpParameter;
if(!pthread_context)
return 0;
abstract_tcp_server<THandler>* pthis = pthread_context->powner;
::InterlockedIncrement(&pthis->m_threads_count);
::CoInitialize(NULL);
LOG_PRINT("Handler thread STARTED with socket=" << pthread_context->m_socket, LOG_LEVEL_2);
int res = 0;
soket_sender sndr(pthread_context->m_socket);
THandler srv(&sndr, pthread_context->powner->m_config, pthread_context->m_context);
srv.after_init_connection();
char buff[1000] = {0};
std::string ansver;
while ( (res = recv(pthread_context->m_socket, (char*)buff, 1000, 0)) > 0)
{
LOG_PRINT("Data in, " << res << " bytes", LOG_LEVEL_3);
if(!srv.handle_recv(buff, res))
break;
}
shutdown(pthread_context->m_socket, SD_BOTH);
closesocket(pthread_context->m_socket);
abstract_tcp_server* powner = pthread_context->powner;
LOG_PRINT("Handler thread with socket=" << pthread_context->m_socket << " STOPPED", LOG_LEVEL_2);
powner->m_connections_lock.lock();
::CloseHandle(pthread_context->m_htread);
pthread_context->powner->m_connections.erase(pthread_context->m_self_it);
powner->m_connections_lock.unlock();
CoUninitialize();
::InterlockedDecrement(&pthis->m_threads_count);
return 1;
}
//----------------------------------------------------------------------------------------
template<class THandler>
abstract_tcp_server<THandler>::abstract_tcp_server():m_listen_socket(INVALID_SOCKET),
m_initialized(false),
m_stop_server(0), m_port(0), m_threads_count(0)
{
}
//----------------------------------------------------------------------------------------
template<class THandler>
bool abstract_tcp_server<THandler>::init_server(int port_no)
{
m_port = port_no;
WSADATA wsad = {0};
int err = ::WSAStartup(MAKEWORD(2,2), &wsad);
if ( err != 0 || LOBYTE( wsad.wVersion ) != 2 || HIBYTE( wsad.wVersion ) != 2 )
{
LOG_ERROR("Could not find a usable WinSock DLL, err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
return false;
}
m_initialized = true;
m_listen_socket = ::WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, 0);
if(INVALID_SOCKET == m_listen_socket)
{
err = ::WSAGetLastError();
LOG_ERROR("Failed to create socket, err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
return false;
}
int opt = 1;
setsockopt (m_listen_socket, SOL_SOCKET,SO_REUSEADDR, reinterpret_cast<char*>(&opt), sizeof(int));
sockaddr_in adr = {0};
adr.sin_family = AF_INET;
adr.sin_addr.s_addr = htonl(INADDR_ANY);
adr.sin_port = (u_short)htons(port_no);
err = bind(m_listen_socket, (const sockaddr*)&adr, sizeof(adr ));
if(SOCKET_ERROR == err )
{
err = ::WSAGetLastError();
LOG_PRINT("Failed to Bind, err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"", LOG_LEVEL_2);
deinit_server();
return false;
}
::InterlockedExchange(&m_stop_server, 0);
return true;
}
//----------------------------------------------------------------------------------------
template<class THandler>
bool abstract_tcp_server<THandler>::deinit_server()
{
if(!m_initialized)
return true;
if(INVALID_SOCKET != m_listen_socket)
{
shutdown(m_listen_socket, SD_BOTH);
int res = closesocket(m_listen_socket);
if(SOCKET_ERROR == res)
{
int err = ::WSAGetLastError();
LOG_ERROR("Failed to closesocket(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
}
m_listen_socket = INVALID_SOCKET;
}
int res = ::WSACleanup();
if(SOCKET_ERROR == res)
{
int err = ::WSAGetLastError();
LOG_ERROR("Failed to WSACleanup(), err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
}
m_initialized = false;
return true;
}
//----------------------------------------------------------------------------------------
template<class THandler>
bool abstract_tcp_server<THandler>::send_stop_signal()
{
InterlockedExchange(&m_stop_server, 1);
return true;
}
//----------------------------------------------------------------------------------------
template<class THandler>
bool abstract_tcp_server<THandler>::run_server()
{
int err = listen(m_listen_socket, 10000);
if(SOCKET_ERROR == err )
{
err = ::WSAGetLastError();
LOG_ERROR("Failed to listen, err = " << err << " \"" << socket_errors::get_socket_error_text(err) <<"\"");
return false;
}
LOG_PRINT("Listening port "<< m_port << "...." , LOG_LEVEL_2);
while(!m_stop_server)
{
sockaddr_in adr_from = {0};
int adr_len = sizeof(adr_from);
fd_set read_fs = {0};
read_fs.fd_count = 1;
read_fs.fd_array[0] = m_listen_socket;
TIMEVAL tv = {0};
tv.tv_usec = 100;
int select_res = select(0, &read_fs, NULL, NULL, &tv);
if(!select_res)
continue;
SOCKET new_sock = WSAAccept(m_listen_socket, (sockaddr *)&adr_from, &adr_len, NULL, NULL);
LOG_PRINT("Accepted connection on socket=" << new_sock, LOG_LEVEL_2);
invoke_connection(new_sock, adr_from.sin_addr.s_addr, adr_from.sin_port);
}
deinit_server();
#define ABSTR_TCP_SRV_WAIT_COUNT_MAX 5000
#define ABSTR_TCP_SRV_WAIT_COUNT_INTERVAL 1000
int wait_count = 0;
while(m_threads_count && wait_count*1000 < ABSTR_TCP_SRV_WAIT_COUNT_MAX)
{
::Sleep(ABSTR_TCP_SRV_WAIT_COUNT_INTERVAL);
wait_count++;
}
LOG_PRINT("abstract_tcp_server exit with wait count=" << wait_count*ABSTR_TCP_SRV_WAIT_COUNT_INTERVAL << "(max=" << ABSTR_TCP_SRV_WAIT_COUNT_MAX <<")", LOG_LEVEL_0);
return true;
}
//----------------------------------------------------------------------------------------
template<class THandler>
bool abstract_tcp_server<THandler>::invoke_connection(SOCKET hnew_sock, const network_address &remote_address)
{
m_connections_lock.lock();
m_connections.push_back(thread_context());
m_connections_lock.unlock();
m_connections.back().m_socket = hnew_sock;
m_connections.back().powner = this;
m_connections.back().m_self_it = --m_connections.end();
m_connections.back().m_context.m_remote_address = remote_address;
m_connections.back().m_htread = threads_helper::create_thread(ConnectionHandlerProc, &m_connections.back()); // ugh, seems very risky
return true;
}
//----------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------
}
}
#endif //_ABSTRACT_TCP_SERVER_H_
