openSocketw.c

/*
 Part of Libnodave, a free communication libray for Siemens S7 300/400.
 This version uses the IBHLink MPI-Ethernet-Adapter from IBH-Softec.
 www.ibh.de
 
 (C) Thomas Hergenhahn (thomas.hergenhahn@web.de) 2002, 2003.

 Libnodave 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, or (at your option)
 any later version.

 Libnodave 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 Libnodave; see the file COPYING.  If not, write to
 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  
*/

#ifndef __openSocket
#define __openSocket
#define DONT_USE_GETHOSTBYNAME


#define ThisModule "openSocketw.c: "
#ifdef BCCWIN
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#endif


#ifndef DONT_USE_GETHOSTBYNAME
//#include <netdb.h>		// for gethostbyname
#endif

#include <stdio.h>
#include <string.h>
#include <errno.h>
//#include <unistd.h>
#include <fcntl.h>
#include "log2.h"
#include "nodave.h"

#include <winsock2.h>


extern int daveDebug;
#define DONT_USE_GETHOSTBYNAME

__declspec (dllexport) HANDLE __stdcall openSocket(const int port, const char * peer) {
    int res;
    SOCKET fd;
    struct sockaddr_in addr;
    int addrlen;
    WSADATA wsadata;
    res=WSAStartup(MAKEWORD(2,0), &wsadata);
#ifndef DONT_USE_GETHOSTBYNAME    
    struct hostent *he;
#endif    
    if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "enter OpenSocket\n");
	FLUSH;
    }
    addr.sin_family = AF_INET;
    if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "1\n");
        FLUSH;
    }	

    addr.sin_port =htons(port);
//addr.sin_port =	(((port) & 0xff) << 8) | (((port) & 0xff00) >> 8);
	if (daveDebug & daveDebugOpen) {
	    printf(ThisModule "2 %04X\n",addr.sin_port);
	    FLUSH;
	}    

#ifndef DONT_USE_GETHOSTBYNAME
	if (daveDebug & daveDebugOpen) {
	    LOG1(ThisModule "3\n");
	    FLUSH;
	}    

    he = gethostbyname(peer);
	LOG1(ThisModule "4\n");
	FLUSH;
    if (!he) return 0;  // bug reported by Nick Hibma

    memcpy(&addr.sin_addr, he->h_addr_list[0], sizeof(addr.sin_addr));
    if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "5\n");
	FLUSH;
    }	

#else
   // inet_aton(peer, &addr.sin_addr);
  addr.sin_addr.s_addr=inet_addr(peer);
  if (daveDebug & daveDebugOpen) {
	printf(ThisModule "peer:%s=%d\n",peer,inet_addr(peer));
	FLUSH;
  }	


  if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "6\n");
	FLUSH;
    }	

#endif

    fd = socket(AF_INET, SOCK_STREAM, AF_UNSPEC);
    if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "7\n");
	FLUSH;
    }	

    if (daveDebug & daveDebugOpen) {
	LOG2(ThisModule "socket is %d\n", fd);
   }	
   if (daveDebug & daveDebugOpen) {
	LOG3(ThisModule "setsockopt %s %d\n", strerror(WSAGetLastError()),WSAGetLastError());
   }
    
    addrlen = sizeof(addr);
    if (daveDebug & daveDebugOpen) {
	LOG1(ThisModule "8\n");
	FLUSH;
    }	
//   if (bind(fd, (struct sockaddr *) & addr, addrlen)) {
//	LOG2(ThisModule "bind Socket error: %s \n", strerror(errno));
//    }
    if (connect(fd, (struct sockaddr *) & addr, addrlen)) {
	if (daveDebug & daveDebugOpen) {
	    LOG2(ThisModule "connect Socket error: %s \n", strerror(errno));
	}    
//	socketClose(fd);
	closesocket(fd);
	fd = 0;
    } else {
//	if (daveDebug & daveDebugOpen) {
	    LOG2(ThisModule "Connected to host: %s \n", peer);
//	}    
/*
	Need this, so we can read a packet with a single read call and make
	read return if there are too few bytes.
*/	
	errno=0;
/*
	res=fcntl(fd, F_SETFL, O_NONBLOCK);
	if (daveDebug & daveDebugOpen) 
	    LOG3(ThisModule "Set mode to O_NONBLOCK %s %d\n", strerror(errno),res);
*/
/*
	I thought this might solve Marc's problem with the CP closing
	a connection after 30 seconds or so, but the Standrad keepalive time
	on my box is 7200 seconds.	    
	errno=0;
	opt=1;
	res=setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, 4);
	LOG3(ThisModule "setsockopt %s %d\n", strerror(errno),res);
*/	
    }	
    FLUSH;
    return (HANDLE) fd;
}

__declspec (dllexport) int __stdcall closeSocket(SOCKET h) {
    return closesocket(h);
}

#endif
/*
    Changes: 
    07/12/2003	moved openSocket to it's own file, because it can be reused in other TCP clients
    04/07/2004  ported C++ version to C
    07/19/2004  removed unused vars.
Version 0.8.4.5    
    07/10/09  	Added closeSocket()
*/