sockets

@NogDogNov 07.2005 — #You can find a number of examples and quite a few user comments/examples starting here: http://www.php.net/manual/en/ref.sockets.php

@bokehNov 07.2005 — #Also I would recommend testing on a local machine so you can intercept the data coming to and from the script. You will need a [URL=http://www.analogx.com/contents/download/network/pmon.htm]packet sniffer[/URL] for this.

The hardest part with sockets (in my opinion) is guessing what output you might receive from the remote server and then responding to that. [URL=http://bokehman.com/validate_email]Here is a script I wrote that uses sockets[/URL] which connects to mailservers and then displays the output.

@acemoauthorNov 07.2005 — #There are already c++ coded servers made by looking at the packets that the client and official server uses, so i guess could ask one of the programmers of it, how it works for the chatting part.

Bokeh, i kno i need a packet sniffer for this and i already got one ? wpe pro 0.9a

I suppose u wont want to release the source of ur script? maybe only some small part of it?

nogdog, i dun really like the php.net site cuz mostly its like heaps of boring text and other pages often got lot less boring tutorials, was hoping u guys knew one for sockets, but ill read it trough ?

tnx

@bokehNov 07.2005 — #Here's a piece of code (that actually works). This was the prototype but with the option to print debug output. It should give you an idea of socket communication in that one specific area.

[code=php]function check_email_address_exists($email)
 {
 $print_debug = NULL; // set to TRUE to print output 

 if (!function_exists('getmxrr')){
 require_once('getmxrr.php');
 } 
 $result = true;
 
  // Extract the mail server name from the email address.
  list ($user, $domain) = split ("@", $email);
  if (getmxrr($domain, $mxhost)){ 
   $ConnectAddress = $mxhost[0];
   }else{
   $ConnectAddress = $domain;
  }
  if(gethostbynamel($ConnectAddress) === FALSE){
   return FALSE;
  }
  // Try to open a socket at the mail server address.
  if($ConnectAddress == $domain){
   $connect = @fsockopen($ConnectAddress, 25, $errno, $errstr, 5);
  }else{
   $tries = count($mxhost);
   $i = 0;
   while(!$connect && !$tries == 0){
   $connect = @fsockopen($mxhost[$i], 25, $errno, $errstr, 5);
   $i++;
   $tries--;
   }
  }
 
  if ($connect)
  {
 
   if (ereg("^220", $out = fgets($connect, 1024)))
   {
   while(ereg('220', $out)){
   $debug[] = 'Remote: '.$out;
   stream_set_timeout($connect, 0, 5000); 
   $out = fgets ( $connect, 1024 );
   stream_set_timeout($connect, 10);
   }
   $debug[] = "Local: EHLO 13.red-80-37-41.staticip.rima-tde.net";
   fputs ($connect, "EHLO 13.red-80-37-41.staticip.rima-tde.netrn");
   $out = fgets ( $connect, 1024 );
   while(!ereg('^250', $out)&&(!empty($out))){
   $debug[] = 'Remote: '.$out;
   stream_set_timeout($connect, 0, 5000); 
   $out = fgets ( $connect, 1024 );
   stream_set_timeout($connect, 10);
   }
   for($tries = 15; $tries > 0; $tries--){
   if(ereg('^250', $out)){
   $debug[] = 'Remote: '.$out;
   $for_loop_hop = $out;
   }elseif(empty($out)){
   usleep(100000); 
   }else{
   $debug[] = 'Remote: '.$out;
   }
   stream_set_timeout($connect, 0, 5000);
   $out = fgets($connect, 1024);
   stream_set_timeout($connect, 10);
   }
   if(!ereg('^250', $for_loop_hop)){
   $debug[] = 'No 250';
   if(isset($_GET['debug'])){
   foreach($debug as $line){
   echo $line.'<br>';
   }
   }
   return FALSE;
   }
   $debug[] = htmlspecialchars("Local: MAIL FROM: <mailer_daemon@{$_SERVER['HTTP_HOST']}>rn");
   fputs ($connect, "MAIL FROM: <{$email}>rn");
   $from = fgets ( $connect, 1024 );
   $debug[] = 'Remote: '.$from;
   $debug[] = htmlspecialchars("Local: RCPT TO: <{$email}>rn");
   fputs ($connect, "RCPT TO: <{$email}>rn");
   $to = fgets ($connect, 1024);
   $debug[] = 'Remote: '.$to;
   $debug[] = "Local: QUITrn";
   fputs ($connect, "QUITrn");
   $quit = fgets ($connect, 1024);
   $debug[] = 'Remote: '.$quit;
   fclose($connect);
 
   // Validate our exchange with the mail server.
 
   // Server rejected address.
   if (!ereg ("^250", $from) || !ereg ("^250", $to))
   {
   $result = false;
   }
   else
   {
   $result = 'Advice: Remote mail exchanger will accept mail for this address.';
   } 
   }
   // No response from server.
   else
   {
   $i--;
   $result = 'Advice: Remote mail exchanger '.$mxhost[$i].' faulty.';
   }
  }
  // Can't connect to server.
  else
  {
   $i--;
   $result = 'Advice: Could not connect to remote mail exchanger: '.$mxhost[$i].'.';
  }
  if(isset($print_debug) and $print_debug){
   if($debug > 0){
   foreach($debug as $line){
   print "$line <br />rn";
   }
   }
  }
  return $result;
 }[/code]

sockets

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