pmxfilter/source/pmx_socket.cpp

/*----------------------------------------------------------------------------------------------
Copyright (c) 2004, Noboru Iwata
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 <ORGANIZATION> 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 OR CONTRIBUTORS 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.

        program    :  pmxfilter

---------------------------------------------------------------------------------------------*/
#include        <sys/types.h>
#include        <sys/socket.h>
#include        <sys/time.h>
#include        <netinet/in.h>
#include        <netdb.h>
#include        <stdio.h>
#include        <string.h>
#include        <unistd.h>
#include        <errno.h>
#include        "pmxfilter.h"

#define         INVALID_SOCKET    -1
#define         SOCKET_ERROR      -1

static          short   wVerReq;
static          struct  sockaddr_in     addr;
static          struct  sockaddr_in     addrc;
static          SOCKET  s;
static          SOCKET  sc;
fd_set          Fdset_ss,Fdset_sc;              //select

static          void    ErrorHandler(char *message,DWORD err);
static          ULONG   GetHostAddress(LPSTR szBuff);

char            rcvMsg[MSGLEN];
char            sndMsg[MSGLEN];

static  ULONG   GetHostAddress(LPSTR szBuff)
{
        struct hostent  *phe;
        phe = gethostbyname(szBuff);
        if (phe == NULL)
                return(0xffffffff);
        return *((unsigned long *)phe->h_addr);
}

static  void    ErrorHandler(char *message,DWORD err)
{
        char    m[32];

        memset(m,0,sizeof(m));
        sprintf(m,"%s:[%ld]\n",message,err);
        printf(m);
}

BOOL    sub_SocInit(char *host,u_short port)
{
        int             err;
        BOOL    st;

        s = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
        if (s == INVALID_SOCKET){
                ErrorHandler("SOCKET CREATE FAIL",0);
                st = FALSE;
                return(st);
        }
        memset(&addr,0x00,sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = GetHostAddress(host);
        addr.sin_port = htons(port);
        if (addr.sin_addr.s_addr == 0xffffffff){
                ErrorHandler("HOSTNAME ERROR",0);
                close(s);
                st = FALSE;
                return(st);
        }
        if (connect(s,(struct sockaddr *)&addr,sizeof(addr)) == SOCKET_ERROR){
                ErrorHandler("CONNECT FAIL��",errno);
                close(s);
                st = FALSE;
                return(st);
        }
        FD_ZERO(&Fdset_sc);
        FD_SET(s,&Fdset_sc);

        st = TRUE;
        return(st);
}

void    sub_SocEnd(void)
{
        close(s);
}

int             sub_cRecv(long t)
{
        int             len;
        fd_set  Rdset;                                  //RCV CHECK
        struct  timeval tv;

        Rdset = Fdset_sc;                               //SOCKET
        tv.tv_sec = t;                                  //TIMEOUT (SE)
        tv.tv_usec = 0;
        if (select(FD_SETSIZE,&Rdset,NULL,NULL,&tv) <= 0) {
                ErrorHandler("RCV TIMEOUT",0);
                close(sc);
                return(-2);
        }

        memset(rcvMsg,0,sizeof(rcvMsg));
        len = recv(s,rcvMsg,sizeof(rcvMsg),0);
        if (len == 0){
                ErrorHandler("SOCKET CLOSE",errno);
                close(s);
                return(0);
        }
        else if(len == SOCKET_ERROR){
                ErrorHandler("RCV ERROR C",errno);
                close(s);
                return(-1);
        }
        return(len);
}

int             sub_cSend(const char *str,int len)
{
        memcpy(sndMsg,str,len);
        int slen = send(s,sndMsg,len,0);
        if (slen == SOCKET_ERROR){
                close(s);
                ErrorHandler("SEND ERROR C",errno);
                return(-1);
        }
        return(slen);
}
