File skip-if-ipv6.c of Package qmail-spp-plugins

/*                                                                                 
* Copyright (C) 2013 Carsten Schoene <cs@linux-adminstrator.com>                   
*                                                                                  
* This program 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 (at your option) any later
* version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/

#include <stdio.h>
#include <stdlib.h>

int
main (int argc, char *argv[])
{
  int fIPv4 = 0;
  int ppid = getppid ();
  char *remote_ip = getenv("TCPREMOTEIP");
  if (!remote_ip) {
    remote_ip = "";
  };
  fIPv4 = (NULL == strchr(remote_ip, ':'));

//If IPv6, don't check at all
  if (!fIPv4)
    {
      printf ("A\n");
      fprintf (stderr,
               "skip-if-ipv6: pid %d - IPV6 (%s) detected. All further plugins will be skipped.\n",
               ppid,remote_ip);
      exit (0);
    }
  // Else: Walk down the plugin chain.
  exit (0);
}