Sending and recieving data to udp port

[mckooter]

Ive been working on this for a while, and i cannot determine if i am not connecting properly, or if the data im sending is wrong and thats why im not getting a response. The goal is to send data to a gaming server via udp, and recieve a response of server information. mainly i am looking to just see if the game server is running, and it will not respond to a regular tcp ping at its port, but the data it sends back could also be usefull too. here is the code i have so far:

 

<?php

$binary_msg = chr(0x00).chr(0x02).chr(0xF1).chr(0x26).chr(0x01).chr(0x26).chr(0xF0).chr(0x90).chr(0xA6).chr(0xF0).chr(0x26).chr(0x57).chr(0x4E).chr(0xAC).chr(0xA0).chr(0xEC).chr(0xF8).chr(0x68).chr(0xE4).chr(0x8D).chr(0x21);

$fp = fsockopen("udp://<<ipaddresshere>>",2302,$errno,$errstr);
if (!$fp) {
    echo "ERROR: $errno - $errstr<br />\n";
} else {
    fwrite($fp, $binary_msg);
    echo fread($fp, 26);
    fclose($fp);
}
?>

 

the server was not doing anything at this point, through some help i recieved elsewhere i tried this:

 

var_dump(bin2hex(fread($fp, 26)));

 

 

and the response was different depending on if i ran it as php4 or php5 (i have to put .php5 on the file to force it myself)

 

PHP5:

Warning: fread(): 1 is not a valid stream resource in /homepages/14/d187646903/htdocs/sites/tekagis/port.php5 on line 12

string(0) ""

 

 

PHP4:

string(0) ""

 

 

 

so I assume that its working, but im not getting any response from the server, is that right? or am i missing something, and if the code is right, can anyone see why it might not be responding, the data i am sending was gathered from this script that does work (C# i believe):

 

 Socket s = new Socket(lep.Address.AddressFamily,
                SocketType.Dgram,
                ProtocolType.Udp);

            byte[] inputToBeSent = new byte[21];

            // Create the "special" packet that will return the correct data
            inputToBeSent[0] = 0x00;
            inputToBeSent[1] = 0x02;
            inputToBeSent[2] = 0xF1;
            inputToBeSent[3] = 0x26;
            inputToBeSent[4] = 0x01;
            inputToBeSent[5] = 0x26;
            inputToBeSent[6] = 0xF0;
            inputToBeSent[7] = 0x90;
            inputToBeSent[8] = 0xA6;
            inputToBeSent[9] = 0xF0;
            inputToBeSent[10] = 0x26;
            inputToBeSent[11] = 0x57;
            inputToBeSent[12] = 0x4E;
            inputToBeSent[13] = 0xAC;
            inputToBeSent[14] = 0xA0;
            inputToBeSent[15] = 0xEC;
            inputToBeSent[16] = 0xF8;
            inputToBeSent[17] = 0x68;
            inputToBeSent[18] = 0xE4;
            inputToBeSent[19] = 0x8D;
            inputToBeSent[20] = 0x21;

            try
            {
                DateTime dtStart = DateTime.Now;

                // Sends datagram to the IpEndPoint specified. This call blocks. 
                s.SendTo(inputToBeSent, 0, inputToBeSent.Length, SocketFlags.None, lep);

                // Creates an IpEndPoint to capture the identity of the sending host.
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint tempRemoteEP = (EndPoint)sender;

                // Creates a byte buffer to receive the message.
                int iAvailable  = s.Available;
                int iSecCount = 0;