PHP - monitor socket for all ports - php

Question

I am running script server.php where I am listening to IP and PORT. I simulate incoming message by running input.php.
Question: How can I listen to every port?
Note: I am trying to catch any message, that will go via TCP/IP protocol to my IP regardless on which port.
server.php
function writeToFile($strFilename, $strText)
{
if ($fp = #fopen($strFilename, "a+")) {
$contents = fwrite($fp, $strText . PHP_EOL);
fclose($fp);
return true;
} else {
return false;
}
}
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$bind = socket_bind($sock, $address, $port);
socket_listen($sock, 5);
while ($con == 1) {
$client = socket_accept($sock);
$input = socket_read($client, 100);
$prefix = date('Y_m_d');
$data = $prefix . '_data.txt';
writeToFile($data, $input);
if ($input == 'exit') {
socket_close($sock);
$con = 0;
}
if ($con == 1) {
$word .= $input;
}
echo $input . PHP_EOL;
socket_write($client, $input . PHP_EOL);
}
input.php
<?php
$address = "192.168.0.103";
$port = 5503;
$randomString = substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 10);
$fp = fsockopen($address, $port);
$bytes = fwrite($fp, $randomString);
if ($bytes == false) {
echo 'Send data: 0 Bytes';
} else {
echo 'Send data: ' . $bytes . ' Bytes';
}
fclose($fp);
exit;

Answer 1

Listening to all ports by creating a socket is not a good idea. Better monitor incoming SYN (synchronize) request and then bind to that particular port.
You can use tcpdump for monitoring incoming requests.
tcpdump -i eth0 -s 1500 port not 22 and '(tcp-syn|tcp-ack)!=0'
You can exclude ports by port not. Make sure to use correct interface name.
Execute above command with php function proc_open, since tcpdump gives continuous output.
$cmd = 'tcpdump -i eth1 -s 1500 port not 22 and "(tcp-syn|tcp-ack)!=0"';
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
flush();
$process = proc_open($cmd, $descriptorspec, $pipes, realpath('./'), array());
if (is_resource($process)) {
while ($s = fgets($pipes[1])) {
print $s;
//make sure $s is a SYN request then create and listen to port
flush();
}
}