NYCPHP Meetup

[Sicular, Alexander]

Phil,

I gather there are many ways to accomplish this... This is just one that
may work for you...


>From within your for loop...

if(intval($yourIPArray[0].$yourIPArray[1].$yourIPArray[2])==intval($ipAr
ray[0].$ipArray[1].$ipArray[2])){
Do stuff
}

The explode should take your ip address and make it an array with 4
items in it. I think the items will be text. Using the '.' to
concatenate the first three values and intval() to turn them into a
number you should be able to see if they match. 

Of course a regex maybe more robust...

Good luck,
alex

-----Original Message-----
From: Phil Powell [mailto:soazine at erols.com] 
Sent: Sunday, June 01, 2003 2:19 AM
To: NYPHP Talk
Subject: [nycphp-talk] Best practice for comparing IP addresses


Consider the following lines of code:

if ($hasEnteredNick == 1 && file_exists("$pathStart/banned_ips.xml")) {
    $fileID = fopen("$pathStart/banned_ips.xml") or die("Cannot open
file $pathStart/banned_ips.xml");
    $stuff = fread($fileID, filesize("$pathStart/banned_ips.xml"));
fclose($fileID);
    $parser = xml_parser_create();
    xml_parse_into_struct($parser, $stuff, $bannedIPArray, $extraStuff);
    xml_parser_free($parser);
    $yourIPArray = explode(".", $REMOTE_ADDR);
    for ($i = 0; $i < sizeOf($bannedIPArray); $i++) {
     $ipArray = explode($bannedIPArray[$i][attributes][IP], ".");

     if (($bannedIPArray[$i][attributes][NICK] === $nick ||
         implode(".", array_pop($yourIPArray)) == implode(".",
array_pop($ipArray))
         ) &&
         $bannedIPArray[$i][attributes][NICK] !== "admin"
        ) {
      // NICKNAME FOUND IN banned_ips.xml FILE - THEY HAVE BEEN BANNED
FROM CHATROOM
      $hasEnteredNick = 0;
      if ($bannedIPArray[$i][attributes][NICK] === $nick) {
       $errorMsg = "You are using a banned nickname, please select
another";
      } else {
       $errorMsg = "The user at this machine ($REMOTE_ADDR) has been
banned from the chatroom";
      }
      break;
     }
    }
         
   }

What I want to do is compare an IP address from a parsed XML file with
the user's IP address.  If a match is found only in the first three
numbers (xx.xx.xx.*) then action is taken.  I thought about using the
following algorithm to do so, but does anyone else have a better
suggestion?  I am not accustomed to either implode, explode or
array_pop, so I am not sure if they are being used properly w/o
extensive testing.

Thanx
Phil



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