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<?php
/**
* Virtual machine PNG screenshot generation
*
* @author Ian Moore (imoore76 at yahoo dot com)
* @copyright Copyright (C) 2010-2015 Ian Moore (imoore76 at yahoo dot com)
* @version $Id: screen.php 591 2015-04-11 22:40:47Z imoore76 $
* @package phpVirtualBox
*
*/
# Turn off PHP notices
error_reporting(E_ALL & ~E_NOTICE & ~E_STRICT & ~E_WARNING);
require_once(dirname(__FILE__).'/lib/config.php');
require_once(dirname(__FILE__).'/lib/utils.php');
require_once(dirname(__FILE__).'/lib/vboxconnector.php');
// Allow caching of some screenshot data
@Header('ETag: "' . $_REQUEST['vm'].'_'.$_REQUEST['randid'].'"');
session_cache_limiter('private_no_expire');
// Check for valid session
global $_SESSION;
session_init();
if(!@$_SESSION['valid']) {
return;
}
// Clean request
$_REQUEST = array_merge(@$_GET,@$_POST);
$settings = new phpVBoxConfigClass();
$vbox = new vboxconnector();
$vbox->connect();
// Set width. Else assume we want real time updates if VM is running below
if($_REQUEST['width']) {
$force_width = $_REQUEST['width'];
}
try {
// Is VM Specified
if(!$_REQUEST['vm']) {
echo("Please specify a VM to take a screen shot of. E.g. http://webserver/phpvirtualbox/screen.php?vm=VMName");
exit;
}
$machine = $vbox->vbox->findMachine($_REQUEST['vm']);
// Is snapshot specified?
if($_REQUEST['snapshot']) {
$snapshot = $machine->findSnapshot($_REQUEST['snapshot']);
$machine->releaseRemote();
$machine = &$snapshot->machine;
} else {
// Get machine state
switch($machine->state->__toString()) {
case 'Running':
case 'Saved':
case 'Restoring':
break;
default:
$machine->releaseRemote();
throw new Exception('The specified virtual machine is not in a Running state.');
}
}
// Date last modified
$dlm = floor($machine->lastStateChange/1000);
// Set last modified header
header("Last-Modified: " . gmdate("D, d M Y H:i:s", $dlm) . " GMT");
$_REQUEST['vm'] = $machine->id;
// Take active screenshot if machine is running
if(!$_REQUEST['snapshot'] && $machine->state->__toString() == 'Running') {
// Let the browser cache images for 3 seconds
$ctime = 0;
if(strpos($_SERVER['HTTP_IF_NONE_MATCH'],'_')) {
$ctime = preg_replace("/.*_/",str_replace('"','',$_SERVER['HTTP_IF_NONE_MATCH']));
} else if(strpos($_ENV['HTTP_IF_NONE_MATCH'],'_')) {
$ctime = preg_replace("/.*_/",str_replace('"','',$_ENV['HTTP_IF_NONE_MATCH']));
} else if(strpos($_SERVER['HTTP_IF_MODIFIED_SINCE'],'GMT')) {
$ctime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
} else if(strpos($_ENV['HTTP_IF_MODIFIED_SINCE'],'GMT')) {
$ctime = strtotime($_ENV['HTTP_IF_MODIFIED_SINCE']);
}
if($ctime >= (time()-3)) {
if (strpos(strtolower(php_sapi_name()),'cgi') !== false) {
Header("Status: 304 Not Modified");
} else {
Header("HTTP/1.0 304 Not Modified");
}
exit;
}
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
$vbox->session = $vbox->websessionManager->getSessionObject($vbox->vbox->handle);
$machine->lockMachine($vbox->session->handle,'Shared');
$machine->releaseRemote();
$res = $vbox->session->console->display->getScreenResolution(0);
$screenWidth = array_shift($res);
$screenHeight = array_shift($res);
// Force screenshot width while maintaining aspect ratio
if($force_width) {
$factor = (float)$force_width / (float)$screenWidth;
$screenWidth = $force_width;
if($factor > 0) {
$screenHeight = $factor * $screenHeight;
} else {
$screenHeight = ($screenWidth * 9.0/16.0);
}
// If no width is set, we were reached from Open in New Window
} else if(!$_REQUEST['width']) {
//Set no caching
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
}
// If we were unable to get screen dimensions, set it to something
if(!$screenWidth || !$screenHeight) {
$screenWidth = 640;
$screenHeight = 480;
}
// array() for compatibility with readSavedScreenshotPNGToArray return value
try {
$imageraw = array($vbox->session->console->display->takeScreenShotToArray(0, $screenWidth, $screenHeight, 'PNG'));
} catch (Exception $e) {
// For some reason this is required or you get "Could not take a screenshot (VERR_TRY_AGAIN)" in some cases.
// I think it's a bug in the Linux guest additions, but cannot prove it.
$vbox->session->console->display->invalidateAndUpdate();
$imageraw = array($vbox->session->console->display->takeScreenShotToArray(0, $screenWidth, $screenHeight, 'PNG'));
}
$vbox->session->unlockMachine();
$vbox->session->releaseRemote();
} else {
// Let the browser cache saved state images
$ctime = 0;
if(strpos($_SERVER['HTTP_IF_NONE_MATCH'],'_')) {
$ctime = preg_replace("/.*_/",str_replace('"','',$_SERVER['HTTP_IF_NONE_MATCH']));
} else if(strpos($_ENV['HTTP_IF_NONE_MATCH'],'_')) {
$ctime = preg_replace("/.*_/",str_replace('"','',$_ENV['HTTP_IF_NONE_MATCH']));
} else if(strpos($_SERVER['HTTP_IF_MODIFIED_SINCE'],'GMT')) {
$ctime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
} else if(strpos($_ENV['HTTP_IF_MODIFIED_SINCE'],'GMT')) {
$ctime = strtotime($_ENV['HTTP_IF_MODIFIED_SINCE']);
}
if($dlm <= $ctime) {
if (strpos(strtolower(php_sapi_name()),'cgi') !== false) {
Header("Status: 304 Not Modified");
} else {
Header("HTTP/1.0 304 Not Modified");
}
exit;
}
if($_REQUEST['full']) $imageraw = $machine->readSavedScreenshotPNGToArray(0);
else $imageraw = $machine->readSavedThumbnailToArray(0, 'PNG');
$machine->releaseRemote();
}
$vbox->session = null;
header("Content-type: image/png",true);
foreach($imageraw as $i) {
if(is_array($i)) echo(base64_decode($i[0]));
}
} catch (Exception $ex) {
// Ensure we close the VM Session if we hit a error, ensure we don't have a aborted VM
if($vbox && $vbox->session && $vbox->session->handle) {
try {
$vbox->session->unlockMachine();
unset($vbox->session);
} catch (Exception $e) {
}
}
if($_REQUEST['full'] && strpos($ex->faultstring,'VERR_NOT_SUPPORTED') > 0) {
@header("Content-type: text/html");
echo("Screen shots are not supported by your VirtualBox installation. To enable screen shots, please install a VirtualBox exteionsion pack that supports VRDE ");
echo("such as the Oracle VM VirtualBox Extension Pack found in the Downloads section of <a href='http://www.virtualbox.org'>http://www.virtualbox.org</a>.");
} else if($_REQUEST['full'] || $_REQUEST['debug']) {
header("Content-type: text/html", true);
echo("<pre>");
print_r($ex);
echo("</pre>");
}
}
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