Help: Send bytes, receiving data with sockets

[LRSSS]

Hey everyone, I'm new to using sockets and have been trying on my own with no avail to send 4 bytes to a server program, then receive the server's response data for display.

 

Outgoing: 4 bytes, 0xFFFFFFFF

Incoming: 4 bytes output data, 12 bytes reserved

 

I'm not sure whether its my syntax or the way I'm handling the input/output but this is what I've tried so far:

 

With socket_create, freezes at: Sending $i

<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false) {
    echo "Error: " . socket_strerror(socket_last_error()) . "<br \>";
} else {
    echo "Created socket<br \>";
}

$result = socket_connect($socket, IP, PORT);
if ($result === false) {
    echo "Error: " . socket_strerror(socket_last_error($socket)) . "<br \>";
} else {
    echo "Connected to socket<br \>";
}

// Bytes to send
$i = chr(0xFF).chr(0xFF).chr(0xFF).chr(0xFF);

echo "Sending $i<br \>";
socket_write($socket, $i, 4);
    
$input = socket_read($socket, 16);
echo "Response: $input<br \>";

echo "Closing socket...";
socket_close($socket);
?>

 

Any help would be appreciated at this point as searching for a solution online for socket handling in php doesn't turn up revelant infomation on byte sending and receiving data like I'd like to do here.

[ignace]

try:

 

echo "Sending $i<br \>";

socket_write($socket, $i, 4);

 

echo "Submitted $i; Receiving response...";

 

$input = socket_read($socket, 16);

echo "Response: $input<br \>";

[LRSSS]

try:

 

echo "Sending $i<br \>";

socket_write($socket, $i, 4);

 

echo "Submitted $i; Receiving response...";

 

$input = socket_read($socket, 16);

echo "Response: $input<br \>";

 

Thanks for the suggestion! Right now the script hangs at:

 

Created socket

Connected to socket

Sending ÿÿÿÿ

 

If I stop the page loading it'll then display:

 

Created socket

Connected to socket

Sending ÿÿÿÿ

Submitted ÿÿÿÿ; Receiving response...

 

That's strange, it's as if I'm missing a little something on how to properly read the data being sent back?

[ignace]

try:

 

echo "Sending $i<br \>";

socket_write($socket, $i, 4);

 

echo "Submitted $i; Receiving response...";

 

$input = socket_read($socket, 16);

echo "Response: $input<br \>";

 

Thanks for the suggestion! Right now the script hangs at:

 

Created socket

Connected to socket

Sending ÿÿÿÿ

 

If I stop the page loading it'll then display:

 

Created socket

Connected to socket

Sending ÿÿÿÿ

Submitted ÿÿÿÿ; Receiving response...

 

That's strange, it's as if I'm missing a little something on how to properly read the data being sent back?

 

Yup apparently there's something wrong with the reading

[LRSSS]

@ignace, I was doing some tests to see if anything was being sent back from the server and nothing was being sent back apparently. In short, the server didn't get the right response packet form me I think? I may have narrowed this problem down a little more as I can get the socket to send successfully and attempt to recieve, but in return nothing is outputted.

 

Created socket

Connected to socket

Sending ÿÿÿÿ, 4 bytes

Submitted ÿÿÿÿ; Receiving response...

Response:

Closing socket...

 

I'm guessing that I didn't structure the packet being sent correctly, thus nothing is being read back. Can I get help on how to  structure to following packet to write to the socket?:

 

4 bytes -> 0xFFFFFFFF

 

chr(0xFF).chr(0xFF).chr(0xFF).chr(0xFF) feels like it's wrong and I have a feel I may have to use pack() although I'm not familiar with the formats. Anyone with byte packets knowledge can help me out in turning the above into a packet I can send?

[ignace]

What you send doesn't actually matter (all the socket knows it's a 4-byte string) it breaks it down into bits and sends it through the wire.

 

I found this: http://www.devshed.com/c/a/PHP/Socket-Programming-With-PHP/ Seems like you are missing a few pieces of the puzzle.