[PHP-WIN] Re: Subject: UDP packet

[Neil Smith]

Since you are getting some data back from the server when connecting in this manner, everything seems to be okay. However - remember that UDP is a connectionless protocol (unlike TCP which has a form of packet accounting), you may not *necessarily* get all the packets delivered which may impact finding an EOF sequence.

You may need to set a socket timeout value (use socket_set_timeout() or stream_set_timeout() with something reasonable, say 1 second) which continues the script if no more data is being received. Read more about this here :

http://www.php.net/manual/en/function.fsockopen.php and
http://www.php.net/manual/en/function.socket-set-timeout.php

I have also verified that some versions of PHP (<4.2) will hang up a script (up to the script timeout) if a packet request is blocked by a firewall on the other end.

You can read more about this in a bug report submitted in February.
http://bugs.php.net/bug.php?id=15639

Hope it works out.

Regards,
Neil Smith.

At 08:04 02/01/2003 +0000, you wrote:

Message-ID: <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Reply-To: "Torben Dehn" <[EMAIL PROTECTED]>
From: "Torben Dehn" <[EMAIL PROTECTED]>
Date: Wed, 1 Jan 2003 17:34:05 +0100
Subject: UDP packet

Hello !

I am very new to PHP so please don't laugh if my code really sucks ;=)

What i am trying to do is :

1) Opening an UDP connectión to a server (That works allright)
2) Making a query to the server (That works allright)
3) Recieve an unknow number of UDP packets with an unknown packet size (This
is my problem)

I don't know the packet size and i don't know how many packets the server
will return...
Take a look at the WHILE loop because thats where it "hangs".
If i remove the WHILE loop and just make a fread($socket,1024) it will
return some data.

My questions  are as follow :
1) How can i make sure that ALL data has been recieved ?
2) Is it possible to read each UDP packet into it's own variable (array) ???

I would be very happy if someone could answer one or all question.


<?
$ip      = "192.246.40.65";
$port    = 27950;
$command = "˙˙˙˙getservers 60 empty full";
$data    = '';

Echo "Connecting to Master Server : $ip:$port<br>";
$socket = fsockopen("udp://$ip",$port,$errno,$errstr,2);
if (!$socket)
 {
   echo "There was an error connecting to the Master Server<br>";
   echo "Error returned was : $errorno and $errostr";
   exit;
 }  //Socket error
 else
 {
   echo "Connection established ..<br>";
   If (!fwrite($socket,$command))
  {
    echo "There was an error querying the master server ..";
    exit;
  } //Fwrite error
 echo "Query complete ..<br>";

while (!feof($socket))
 {
    echo "Reading data ..<br>";
    $data .= fread($socket,4096);
  }  //End of read section

  echo "$data<br>";

   fclose($socket);
   echo "Connection closed ..<br>";
 } //End of main loop

?>

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