<?php
// ----------------------------------------------------------------------
// Copyright (C) 2007 by GREGORY LE BRAS
// ----------------------------------------------------------------------
// LICENSE
//
// This file is part of ODCNMS - Open DataCenter Network Management System
// 
// ODCNMS 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.
// 
// Foobar 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 Foobar; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
// ----------------------------------------------------------------------
// Original Author of file: GREGORY LE BRAS - http://www.odcnms.org/
// ----------------------------------------------------------------------

### Function to determine network characteristics
### $host = IP address or hostname of target host (string)
### $mask = Subnet mask of host in dotted decimal (string)
### returns array with
###   "cidr"      => host and mask in CIDR notation
###   "network"   => network address
###   "broadcast" => broadcast address
###
### Example: find_net("192.168.37.215","255.255.255.224")
### returns:
###    "cidr"      => 192.168.37.215/27
###    "network"   => 192.168.37.192
###    "broadcast" => 192.168.37.223
###

function find_net($host,$mask) {

   $bits=strpos(decbin(ip2long($mask)),"0");
   $net["cidr"]="/".$bits;

   $net["network"]=long2ip(bindec(decbin(ip2long(gethostbyname($host))) & decbin(ip2long($mask))));

   $binhost=str_pad(decbin(ip2long(gethostbyname($host))),32,"0",STR_PAD_LEFT);
   $binmask=str_pad(decbin(ip2long($mask)),32,"0",STR_PAD_LEFT);
   $broadcast = 0;
   for ($i=0; $i<32; $i++) {
      if (substr($binhost,$i,1)=="1" || substr($binmask,$i,1)=="0") {
         $broadcast.="1";
      }  else {
         $broadcast.="0";
      }
   }
   $net["broadcast"]=long2ip(bindec($broadcast));

   return $net;
}

?>