mcserver/WebServer/Socket.cpp

/*
   Socket.cpp

   Copyright (C) 2002-2004 René Nyffenegger

   This source code is provided 'as-is', without any express or implied
   warranty. In no event will the author be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this source code must not be misrepresented; you must not
      claim that you wrote the original source code. If you use this source code
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.

   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original source code.

   3. This notice may not be removed or altered from any source distribution.

   René Nyffenegger rene.nyffenegger@adp-gmbh.ch
*/

/*
	Note on point 2:
		THIS IS NOT THE ORIGINAL SOURCE1!!1!!!~!!~`1ONE!!`1
*/

#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

#include "Socket.h"
#include <iostream>

#ifndef _WIN32
#include <cstring>
#include <sys/time.h>
#define SD_SEND 0x01
#else
	#define MSG_NOSIGNAL (0)
#endif

#ifdef __MAC_NA
	#define MSG_NOSIGNAL (0)
#endif

using namespace std;

int Socket::nofSockets_= 0;

void Socket::Start() {
#ifdef _WIN32
  if (!nofSockets_) {
    WSADATA info;
    if (WSAStartup(MAKEWORD(2,0), &info)) {
      throw "Could not start WSA";
    }
  }
#endif
  ++nofSockets_;
}

void Socket::End() {
#ifdef _WIN32
  WSACleanup();
#endif
}

Socket::Socket() : s_(0) {
  Start();
  // UDP: use SOCK_DGRAM instead of SOCK_STREAM
  s_ = socket(AF_INET,SOCK_STREAM,0);

#ifdef _WIN32
  if(s_ ==INVALID_SOCKET)
#else
  if(s_ < 0)
#endif
  {
    throw "INVALID_SOCKET";
  }

  refCounter_ = new int(1);
}

Socket::Socket(SOCKET s) : s_(s) {
  Start();
  refCounter_ = new int(1);
};

Socket::~Socket() {
  if (! --(*refCounter_)) {
    Close();
    delete refCounter_;
  }

  --nofSockets_;
  if (!nofSockets_) End();
}

Socket::Socket(const Socket& o) {
  refCounter_=o.refCounter_;
  (*refCounter_)++;
  s_         =o.s_;

  nofSockets_++;
}

Socket& Socket::operator=(Socket& o) {
  (*o.refCounter_)++;

  refCounter_=o.refCounter_;
  s_         =o.s_;

  nofSockets_++;

  return *this;
}

void Socket::Close( bool a_WaitSend /* = false */ )
{
	if( s_ )
	{
		if( a_WaitSend )
		{
			assert( shutdown(s_, SD_SEND ) == 0 );
			char c;
			while( recv(s_, &c, 1, 0 ) > 0 )
			{}
		}

		closesocket(s_);
		s_ = 0;
	}
}

std::string Socket::ReceiveLine() {
  std::string ret;
  while (1) {
    char r;

    if (recv(s_, &r, 1, 0) <= 0 )
    {
        return "";
    }
    ret += r;
    if (r == '\n')  return ret;
  }
}

std::string Socket::ReceiveBytes( unsigned int a_Length ) {
	std::string ret;
	while( ret.size() < a_Length ) {
		char r;

		if (recv(s_, &r, 1, 0) <= 0 )
		{
			return "";
		}
		ret += r;
	}
	return ret;
}

void Socket::SendLine(std::string s) {
  s += '\n';
  if( send(s_,s.c_str(),s.length(),MSG_NOSIGNAL) <= 0 )
  {
      //printf("SendLine Socket error!! \n" );
      Close();
  }
}

void Socket::SendBytes(const std::string& s) {
  if( send(s_,s.c_str(),s.length(), MSG_NOSIGNAL) <= 0 )
  {
      //printf("SendBytes Socket error!! \n" );
      Close();
  }
}

SocketServer::SocketServer(int port, int connections, TypeSocket type) {
  sockaddr_in sa;

  memset(&sa, 0, sizeof(sa));

  sa.sin_family = PF_INET;
  sa.sin_port = htons(port);
  s_ = socket(AF_INET, SOCK_STREAM, 0);

#ifdef _WIN32
	if(s_ ==INVALID_SOCKET)
#else
    if(s_ < 0)
#endif
  {
    LOG("WebServer: INVALID_SOCKET");
  }

  if(type==NonBlockingSocket) {
    return;
  }

#ifdef _WIN32
  char yes = 1;
#else
  int yes = 1;
#endif
  if (setsockopt(s_,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
	  LOG("WebServer: setsockopt == -1");
	  return;
  }

  /* bind the socket to the internet address */
  if (bind(s_, (sockaddr *)&sa, sizeof(sockaddr_in)) == SOCKET_ERROR) {
    closesocket(s_);
	LOG("WebServer: INVALID_SOCKET");
  }

  listen(s_, connections);
}

Socket* SocketServer::Accept()
{

  SOCKET new_sock = accept(s_, 0, 0);
#ifdef _WIN32
	if(new_sock==INVALID_SOCKET || s_ == 0)
#else
    if(new_sock < 0 || s_ == 0)
#endif
  {
    #ifdef _WIN32
    int rc = WSAGetLastError();
    if(rc==WSAEWOULDBLOCK) {
      return 0; // non-blocking call, no request pending
    }
    else
    #endif
    {
      //throw "Invalid Socket";
	  return 0;
    }
  }

  Socket* r = new Socket(new_sock);
  return r;
}

SocketClient::SocketClient(const std::string& host, int port) : Socket() {
  std::string error;

  hostent *he;
  if ((he = gethostbyname(host.c_str())) == 0) {
#ifdef _WIN32
    error = strerror(errno);
#endif
    throw error;
  }

  sockaddr_in addr;
  addr.sin_family = AF_INET;
  addr.sin_port = htons(port);
  addr.sin_addr = *((in_addr *)he->h_addr);
  memset(&(addr.sin_zero), 0, 8);

  if (::connect(s_, (sockaddr *) &addr, sizeof(sockaddr))) {
#ifdef _WIN32
    error = strerror(WSAGetLastError());
#endif
    throw error;
  }
}

#ifndef _WIN32
struct timeval;
#endif

SocketSelect::SocketSelect(Socket const * const s1, Socket const * const s2, TypeSocket type) {
  FD_ZERO(&fds_);
  FD_SET(const_cast<Socket*>(s1)->s_,&fds_);
  if(s2) {
    FD_SET(const_cast<Socket*>(s2)->s_,&fds_);
  }

#ifdef _WIN32
  TIMEVAL *ptval = 0;
#else
  timeval *ptval = 0;
#endif

  if (select (0, &fds_, (fd_set*) 0, (fd_set*) 0, ptval) == SOCKET_ERROR)
    throw "Error in select";
}

bool SocketSelect::Readable(Socket const* const s) {
  if (FD_ISSET(s->s_,&fds_)) return true;
  return false;
}