path: root/src/net/network.cpp

/**

	The Mana World
	Copyright 2004 The Mana World Development Team

    This file is part of The Mana World.

    The Mana World is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    The Mana World is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with The Mana World; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include "network.h"
#ifndef WIN32
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#endif

/** Warning: buffers and other variables are shared,
    so there can be only one connection active at a time */

int buffer_size = 65536;
char *in, *out;
int in_size, out_size;

SOCKET sock;
SOCKADDR_IN addr;
// File descriptors attached to socket
fd_set read_socket;
fd_set write_socket;

/** Increase size of written data */
void WFIFOSET(int len) {
	if(out_size+len>=buffer_size)
		warning("Output buffer full");
	else out_size+=len;
}

/** Convert an address from int format to string */
char *iptostring(int address) {
	short temp1, temp2;

	char *temp = (char *)malloc(sizeof(char[20]));
	temp1 = LOWORD(address);
	temp2 = HIWORD(address);
	sprintf(temp, "%i.%i.%i.%i", LOBYTE(temp1), HIBYTE(temp1), LOBYTE(temp2), HIBYTE(temp2));
	return temp;
}

/** Open a session with a server */
SOCKET open_session(const char* address, short port) {
	#ifdef WIN32
	WSADATA wsda;
	#endif
	struct hostent *server;
	int ret;

	// Init WinSock and connect the socket
	#ifdef WIN32
	WSAStartup(MAKEWORD(2,0), &wsda);
	#endif

	sock = socket(PF_INET, SOCK_STREAM, 0); // Create socket for current session
	if(sock==SOCKET_ERROR)return SOCKET_ERROR;

	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = inet_addr(address);
	if(addr.sin_addr.s_addr == INADDR_NONE){
		server = NULL;
		server = gethostbyname(address);
		if(server == NULL)return SOCKET_ERROR;
			memcpy(&addr.sin_addr, server->h_addr_list[0], server->h_length);
	}

	ret = connect(sock, (struct sockaddr *) &addr, sizeof(addr));
	if(ret == SOCKET_ERROR)return SOCKET_ERROR;

	// Init buffers
	in = (char *)malloc(buffer_size);
	out = (char *)malloc(buffer_size);
	memset(in, '\0', buffer_size);
	memset(out, '\0', buffer_size);
	in_size = 0;
	out_size = 0;
	FD_CLR(sock, &read_socket);
	FD_CLR(sock, &write_socket);

	return sock;	
}

/** Close a session */
void close_session() {
	FD_CLR(sock,&read_socket);
	FD_CLR(sock,&write_socket);
    closesocket(sock);	
	if(in!=NULL)free(in);
	if(out!=NULL)free(out);
	in = NULL;
	out = NULL;
	in_size = 0;
	out_size = 0;
	WSACleanup();
}

/** Send and receive data waiting in the buffers */
void flush() {
    int ret = 0;
    void *buf = out; //-kth5
    timeval time_out;

    // Init the time_out struct to 0s so it won't block
    time_out.tv_sec=0;
    time_out.tv_usec=0;

    // Clear file descriptors and set them to socket
    FD_ZERO(&read_socket);
    FD_ZERO(&write_socket);
    FD_SET(sock, &read_socket);
    FD_SET(sock, &write_socket);

    // Check if socket has available data by evaluating attached file descriptors
    select(FD_SETSIZE, &read_socket, &write_socket, NULL, &time_out);

    // Send data if available
    if(FD_ISSET(sock, &write_socket)) {
        // While there wasn't a error or sent the whole data: handles partial packet send
        while((ret!=SOCKET_ERROR)&&(out_size>0)) { 
            ret = send(sock, (char *)buf, out_size, 0);
						/*FILE *file = fopen("log.log","wb");

						fprintf(file, "%s", out[0]);
						fclose(file);*/
						// If not the whole data has been sent, empty the buffer from already sent bytes
            if(ret!=SOCKET_ERROR && ret>0) {
                buf = (char*)buf+ret; //-kth5
                out_size -= ret;
            }
        }
        if(ret==SOCKET_ERROR) {
            error("Socket Error");
#ifdef WIN32
            log_int("Error", "socket_error", WSAGetLastError());
#else 
            log("Error", "socket_error", "Undefined socket error");
#endif
        }
    }

    // Read data, if available
    if(FD_ISSET(sock, &read_socket)) {
      /* There's no check for partial received packets because at this level
         the app doesn't know packet length, but it will done when parsing received data */
      ret = recv(sock, in+in_size, RFIFOSPACE, 0);
      if(ret==SOCKET_ERROR) {
#ifdef WIN32
		  log_int("Error", "socket_error", WSAGetLastError());
#else 
		  log("Error", "socket_error", "Undefined socket error");
#endif
	  } else RFIFOSET(ret); // Set size of available data to read
    }
}