A collection of scripts to solve server-conversation CTF tasks

interserver.php

<pre><?php
ini_set('max_execution_time', '0');
$sock = fsockopen("olymp.hackforces.com:9000");

while ($in = fgets($sock)) {
	echo "$in";
	
	$out = strrev($in);

	//fwrite($sock, "$out\n");
	//echo "< $out\r\n";
	echo '<!--' . str_repeat('x', 999) . '-->';
	flush();
}
fclose($sock);

interserver.py

import socket
from time import sleep
        
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("127.0.0.1", 6969))

while True:
        sleep(.300)
        inS = str(conn.recv(1024*10), 'ascii')
        print(inS)
        
        if inS.startswith('Start'):
                outS = "token"
        elif inS.startswith('lolkek'):
                outS = "cheburek"
        elif inS.startswith('keklol'):
                outS = "arbidol"
        else:
                outS = input()                
        outS = outS.strip()
        if outS != '':
                conn.send(bytes(outS+"\n", 'ascii'))
                print(outS)

interserver_old.php

<pre><?php
ini_set('max_execution_time', '0');
$sock = fsockopen("innoctf.ru:5005");

$in = ''; $all = '';
$count = 0;
while ($c = fread($sock, 2)) {
    if (in_array(substr($c, 0, 1), ["\r"]) && $in) {
    	echo "> $in\r\n";
    	
    	$out = $in;
		fwrite($sock, "$out\n");
    	echo "< $out\r\n";
    	echo '<!--' . str_repeat('x', 999) . '-->';
    	flush();
    }
    else {
    	$in .= $c;
    }
    $all .= $c;
}
echo "<hr>$all";
fclose($sock);