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Php – stream_socket_client keeps sometimes truncates messages

The following code should return the whole message all the time but it doesn’t… I keep refreshing and at some point it prints:

Connected to UWT-RTR-002

And some others as expected:

Connected to UWT-RTR-002 Wireshark full trace start/stop control program Type "help" for instructions 2024-07-08 12:08:50 command:

Then I tried to pass the command "help" but I get nothing… It works when I use telnet on Windows Command Prompt.

UPDATE: while is taking too long, it doesn’t display any error.

$address = '10.0.0.200';
$port = 41200;
$sock = stream_socket_client("tcp://".$address.":".$port, $errno, $errstr); 
fwrite($sock, "helpn");
while ($data = fread($sock, 8192)){
    echo $data."<br>";
}
fclose($sock);

Trying to read and send commands to a TCP

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2

Answers


  1. Chosen as BEST ANSWER
    0

    This is what the server-guy did and it loads fast:

    <?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

set_time_limit(0);
ob_implicit_flush();

$address = '10.0.0.200';
$port = 41200;
echo "<b>Address:</b> ".$address." <b>PORT</b> ".$port."n";


$socket = stream_socket_client("tcp://".$address.":".$port,$errno, $errstr, 30);
if (!$socket)
{
    echo "error opening socket";
    die();
}

stream_socket_sendto($socket, "helpn");

$command_sent = 0;

while(!feof($socket))
{
    $data = stream_get_line($socket, 1500, "n");
    echo $data."<br>n";
    if ($data == 'command:')
    {
        if ($command_sent == 0)
        {
            stream_socket_sendto($socket, "statusn");
        }
        else
        {
            stream_socket_sendto($socket, "exitn");
        }
        $command_sent = 1;
    }
}

fclose($socket);
echo "donen";
?>

  2. 0

    Since TCP doesn’t have message boundaries, you have to define a way to tell how long the message is yourself. One option is to send the message length first, then read that many bytes in a loop.

    This code will work as long as messages are less than 256 bytes long.

    $address = '10.0.0.200';
$port = 41200;
$sock = stream_socket_client("tcp://".$address.":".$port, $errno, $errstr); 
$msg = "help";
fwrite($sock, chr(strlen($msg)));
fwrite($sock, $msg);
$length = ord(fread($sock, 1));
$recv_msg = '';
while ($length > 0 && $data = fread($sock, $length)){
    $recv_msg .= $data;
    $length -= strlen($data);
}
echo $recv_msg . "<br>";
fclose($sock);
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