1 files changed, 594 insertions, 0 deletions
diff --git a/phpBB/includes/functions_download.php b/phpBB/includes/functions_download.php
new file mode 100644
index 0000000000..63693c1db4
--- /dev/null
+++ b/phpBB/includes/functions_download.php
@@ -0,0 +1,594 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2005 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* A simplified function to deliver avatars
+* The argument needs to be checked before calling this function.
+*/
+function send_avatar_to_browser($file, $browser)
+{
+	global $config, $phpbb_root_path;
+
+	$prefix = $config['avatar_salt'] . '_';
+	$image_dir = $config['avatar_path'];
+
+	// Adjust image_dir path (no trailing slash)
+	if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
+	{
+		$image_dir = substr($image_dir, 0, -1) . '/';
+	}
+	$image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
+
+	if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
+	{
+		$image_dir = '';
+	}
+	$file_path = $phpbb_root_path . $image_dir . '/' . $prefix . $file;
+
+	if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
+	{
+		header('Pragma: public');
+
+		$image_data = @getimagesize($file_path);
+		header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
+
+		if (strpos(strtolower($browser), 'msie') !== false && strpos(strtolower($browser), 'msie 8.0') === false)
+		{
+			header('Content-Disposition: attachment; ' . header_filename($file));
+
+			if (strpos(strtolower($browser), 'msie 6.0') !== false)
+			{
+				header('Expires: -1');
+			}
+			else
+			{
+				header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
+			}
+		}
+		else
+		{
+			header('Content-Disposition: inline; ' . header_filename($file));
+			header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
+		}
+
+		$size = @filesize($file_path);
+		if ($size)
+		{
+			header("Content-Length: $size");
+		}
+
+		if (@readfile($file_path) == false)
+		{
+			$fp = @fopen($file_path, 'rb');
+
+			if ($fp !== false)
+			{
+				while (!feof($fp))
+				{
+					echo fread($fp, 8192);
+				}
+				fclose($fp);
+			}
+		}
+
+		flush();
+	}
+	else
+	{
+		header('HTTP/1.0 404 Not Found');
+	}
+}
+
+/**
+* Wraps an url into a simple html page. Used to display attachments in IE.
+* this is a workaround for now; might be moved to template system later
+* direct any complaints to 1 Microsoft Way, Redmond
+*/
+function wrap_img_in_html($src, $title)
+{
+	echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-Strict.dtd">';
+	echo '<html>';
+	echo '<head>';
+	echo '<meta http-equiv="content-type" content="text/html; charset=UTF-8" />';
+	echo '<title>' . $title . '</title>';
+	echo '</head>';
+	echo '<body>';
+	echo '<div>';
+	echo '<img src="' . $src . '" alt="' . $title . '" />';
+	echo '</div>';
+	echo '</body>';
+	echo '</html>';
+}
+
+/**
+* Send file to browser
+*/
+function send_file_to_browser($attachment, $upload_dir, $category)
+{
+	global $user, $db, $config, $phpbb_root_path;
+
+	$filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename'];
+
+	if (!@file_exists($filename))
+	{
+		trigger_error($user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf($user->lang['FILE_NOT_FOUND_404'], $filename));
+	}
+
+	// Correct the mime type - we force application/octetstream for all files, except images
+	// Please do not change this, it is a security precaution
+	if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
+	{
+		$attachment['mimetype'] = (strpos(strtolower($user->browser), 'msie') !== false || strpos(strtolower($user->browser), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
+	}
+
+	if (@ob_get_length())
+	{
+		@ob_end_clean();
+	}
+
+	// Now send the File Contents to the Browser
+	$size = @filesize($filename);
+
+	// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
+
+	// Check if headers already sent or not able to get the file contents.
+	if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
+	{
+		// PHP track_errors setting On?
+		if (!empty($php_errormsg))
+		{
+			trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
+		}
+
+		trigger_error('UNABLE_TO_DELIVER_FILE');
+	}
+
+	// Make sure the database record for the filesize is correct
+	if ($size > 0 && $size != $attachment['filesize'])
+	{
+		// Update database record
+		$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
+			SET filesize = ' . (int) $size . '
+			WHERE attach_id = ' . (int) $attachment['attach_id'];
+		$db->sql_query($sql);
+	}
+
+	// Now the tricky part... let's dance
+	header('Pragma: public');
+
+	// Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
+	$is_ie8 = (strpos(strtolower($user->browser), 'msie 8.0') !== false);
+	header('Content-Type: ' . $attachment['mimetype']);
+
+	if ($is_ie8)
+	{
+		header('X-Content-Type-Options: nosniff');
+	}
+
+	if ($category == ATTACHMENT_CATEGORY_FLASH && request_var('view', 0) === 1)
+	{
+		// We use content-disposition: inline for flash files and view=1 to let it correctly play with flash player 10 - any other disposition will fail to play inline
+		header('Content-Disposition: inline');
+	}
+	else
+	{
+		if (empty($user->browser) || (!$is_ie8 && (strpos(strtolower($user->browser), 'msie') !== false)))
+		{
+			header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
+			if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
+			{
+				header('expires: -1');
+			}
+		}
+		else
+		{
+			header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
+			if ($is_ie8 && (strpos($attachment['mimetype'], 'image') !== 0))
+			{
+				header('X-Download-Options: noopen');
+			}
+		}
+	}
+
+	if ($size)
+	{
+		header("Content-Length: $size");
+	}
+
+	// Close the db connection before sending the file etc.
+	file_gc(false);
+
+	if (!set_modified_headers($attachment['filetime'], $user->browser))
+	{
+		// We make sure those have to be enabled manually by defining a constant
+		// because of the potential disclosure of full attachment path
+		// in case support for features is absent in the webserver software.
+		if (defined('PHPBB_ENABLE_X_ACCEL_REDIRECT') && PHPBB_ENABLE_X_ACCEL_REDIRECT)
+		{
+			// X-Accel-Redirect - http://wiki.nginx.org/XSendfile
+			header('X-Accel-Redirect: ' . $user->page['root_script_path'] . $upload_dir . '/' . $attachment['physical_filename']);
+			exit;
+		}
+		else if (defined('PHPBB_ENABLE_X_SENDFILE') && PHPBB_ENABLE_X_SENDFILE && !phpbb_http_byte_range($size))
+		{
+			// X-Sendfile - http://blog.lighttpd.net/articles/2006/07/02/x-sendfile
+			// Lighttpd's X-Sendfile does not support range requests as of 1.4.26
+			// and always requires an absolute path.
+			header('X-Sendfile: ' . dirname(__FILE__) . "/../$upload_dir/{$attachment['physical_filename']}");
+			exit;
+		}
+
+		// Try to deliver in chunks
+		@set_time_limit(0);
+
+		$fp = @fopen($filename, 'rb');
+
+		if ($fp !== false)
+		{
+			// Deliver file partially if requested
+			if ($range = phpbb_http_byte_range($size))
+			{
+				fseek($fp, $range['byte_pos_start']);
+
+				send_status_line(206, 'Partial Content');
+				header('Content-Range: bytes ' . $range['byte_pos_start'] . '-' . $range['byte_pos_end'] . '/' . $range['bytes_total']);
+				header('Content-Length: ' . $range['bytes_requested']);
+			}
+
+			while (!feof($fp))
+			{
+				echo fread($fp, 8192);
+			}
+			fclose($fp);
+		}
+		else
+		{
+			@readfile($filename);
+		}
+
+		flush();
+	}
+
+	exit;
+}
+
+/**
+* Get a browser friendly UTF-8 encoded filename
+*/
+function header_filename($file)
+{
+	$user_agent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : '';
+
+	// There be dragons here.
+	// Not many follows the RFC...
+	if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($user_agent, 'Konqueror') !== false)
+	{
+		return "filename=" . rawurlencode($file);
+	}
+
+	// follow the RFC for extended filename for the rest
+	return "filename*=UTF-8''" . rawurlencode($file);
+}
+
+/**
+* Check if downloading item is allowed
+*/
+function download_allowed()
+{
+	global $config, $user, $db;
+
+	if (!$config['secure_downloads'])
+	{
+		return true;
+	}
+
+	$url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
+
+	if (!$url)
+	{
+		return ($config['secure_allow_empty_referer']) ? true : false;
+	}
+
+	// Split URL into domain and script part
+	$url = @parse_url($url);
+
+	if ($url === false)
+	{
+		return ($config['secure_allow_empty_referer']) ? true : false;
+	}
+
+	$hostname = $url['host'];
+	unset($url);
+
+	$allowed = ($config['secure_allow_deny']) ? false : true;
+	$iplist = array();
+
+	if (($ip_ary = @gethostbynamel($hostname)) !== false)
+	{
+		foreach ($ip_ary as $ip)
+		{
+			if ($ip)
+			{
+				$iplist[] = $ip;
+			}
+		}
+	}
+
+	// Check for own server...
+	$server_name = $user->host;
+
+	// Forcing server vars is the only way to specify/override the protocol
+	if ($config['force_server_vars'] || !$server_name)
+	{
+		$server_name = $config['server_name'];
+	}
+
+	if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
+	{
+		$allowed = true;
+	}
+
+	// Get IP's and Hostnames
+	if (!$allowed)
+	{
+		$sql = 'SELECT site_ip, site_hostname, ip_exclude
+			FROM ' . SITELIST_TABLE;
+		$result = $db->sql_query($sql);
+
+		while ($row = $db->sql_fetchrow($result))
+		{
+			$site_ip = trim($row['site_ip']);
+			$site_hostname = trim($row['site_hostname']);
+
+			if ($site_ip)
+			{
+				foreach ($iplist as $ip)
+				{
+					if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
+					{
+						if ($row['ip_exclude'])
+						{
+							$allowed = ($config['secure_allow_deny']) ? false : true;
+							break 2;
+						}
+						else
+						{
+							$allowed = ($config['secure_allow_deny']) ? true : false;
+						}
+					}
+				}
+			}
+
+			if ($site_hostname)
+			{
+				if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
+				{
+					if ($row['ip_exclude'])
+					{
+						$allowed = ($config['secure_allow_deny']) ? false : true;
+						break;
+					}
+					else
+					{
+						$allowed = ($config['secure_allow_deny']) ? true : false;
+					}
+				}
+			}
+		}
+		$db->sql_freeresult($result);
+	}
+
+	return $allowed;
+}
+
+/**
+* Check if the browser has the file already and set the appropriate headers-
+* @returns false if a resend is in order.
+*/
+function set_modified_headers($stamp, $browser)
+{
+	// let's see if we have to send the file at all
+	$last_load 	=  isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime(trim($_SERVER['HTTP_IF_MODIFIED_SINCE'])) : false;
+	if ((strpos(strtolower($browser), 'msie 6.0') === false) && (strpos(strtolower($browser), 'msie 8.0') === false))
+	{
+		if ($last_load !== false && $last_load >= $stamp)
+		{
+			send_status_line(304, 'Not Modified');
+			// seems that we need those too ... browsers
+			header('Pragma: public');
+			header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
+			return true;
+		}
+		else
+		{
+			header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
+		}
+	}
+	return false;
+}
+
+/**
+* Garbage Collection
+*
+* @param bool $exit		Whether to die or not.
+*
+* @return void
+*/
+function file_gc($exit = true)
+{
+	global $cache, $db;
+
+	if (!empty($cache))
+	{
+		$cache->unload();
+	}
+
+	$db->sql_close();
+
+	if ($exit)
+	{
+		exit;
+	}
+}
+
+/**
+* HTTP range support (RFC 2616 Section 14.35)
+*
+* Allows browsers to request partial file content
+* in case a download has been interrupted.
+*
+* @param int $filesize		the size of the file in bytes we are about to deliver
+*
+* @return mixed		false if the whole file has to be delivered
+*					associative array on success
+*/
+function phpbb_http_byte_range($filesize)
+{
+	// Only call find_range_request() once.
+	static $request_array;
+
+	if (!$filesize)
+	{
+		return false;
+	}
+
+	if (!isset($request_array))
+	{
+		$request_array = phpbb_find_range_request();
+	}
+	
+	return (empty($request_array)) ? false : phpbb_parse_range_request($request_array, $filesize);
+}
+
+/**
+* Searches for HTTP range request in super globals.
+*
+* @return mixed		false if no request found
+*					array of strings containing the requested ranges otherwise
+*					e.g. array(0 => '0-0', 1 => '123-125')
+*/
+function phpbb_find_range_request()
+{
+	$globals = array(
+		array('_SERVER',	'HTTP_RANGE'),
+		array('_ENV',		'HTTP_RANGE'),
+	);
+
+	foreach ($globals as $array)
+	{
+		$global	= $array[0];
+		$key	= $array[1];
+
+		// Make sure range request starts with "bytes="
+		if (isset($GLOBALS[$global][$key]) && strpos($GLOBALS[$global][$key], 'bytes=') === 0)
+		{
+			// Strip leading 'bytes='
+			// Multiple ranges can be separated by a comma
+			return explode(',', substr($GLOBALS[$global][$key], 6));
+		}
+	}
+
+	return false;
+}
+
+/**
+* Analyses a range request array.
+*
+* A range request can contain multiple ranges,
+* we however only handle the first request and
+* only support requests from a given byte to the end of the file.
+*
+* @param array	$request_array	array of strings containing the requested ranges
+* @param int	$filesize		the full size of the file in bytes that has been requested
+*
+* @return mixed		false if the whole file has to be delivered
+*					associative array on success
+*						byte_pos_start		the first byte position, can be passed to fseek()
+*						byte_pos_end		the last byte position
+*						bytes_requested		the number of bytes requested
+*						bytes_total			the full size of the file
+*/
+function phpbb_parse_range_request($request_array, $filesize)
+{
+	// Go through all ranges
+	foreach ($request_array as $range_string)
+	{
+		$range = explode('-', trim($range_string));
+
+		// "-" is invalid, "0-0" however is valid and means the very first byte.
+		if (sizeof($range) != 2 || $range[0] === '' && $range[1] === '')
+		{
+			continue;
+		}
+
+		if ($range[0] === '')
+		{
+			// Return last $range[1] bytes.
+
+			if (!$range[1])
+			{
+				continue;
+			}
+
+			if ($range[1] >= $filesize)
+			{
+				return false;
+			}
+
+			$first_byte_pos	= $filesize - (int) $range[1];
+			$last_byte_pos	= $filesize - 1;
+		}
+		else
+		{
+			// Return bytes from $range[0] to $range[1]
+
+			$first_byte_pos	= (int) $range[0];
+			$last_byte_pos	= (int) $range[1];
+
+			if ($last_byte_pos && $last_byte_pos < $first_byte_pos)
+			{
+				// The requested range contains 0 bytes.
+				continue;
+			}
+
+			if ($first_byte_pos >= $filesize)
+			{
+				// Requested range not satisfiable
+				return false;
+			}
+
+			// Adjust last-byte-pos if it is absent or greater than the content.
+			if ($range[1] === '' || $last_byte_pos >= $filesize)
+			{
+				$last_byte_pos = $filesize - 1;
+			}
+		}
+
+		// We currently do not support range requests that end before the end of the file
+		if ($last_byte_pos != $filesize - 1)
+		{
+			continue;
+		}
+
+		return array(
+			'byte_pos_start'	=> $first_byte_pos,
+			'byte_pos_end'		=> $last_byte_pos,
+			'bytes_requested'	=> $last_byte_pos - $first_byte_pos + 1,
+			'bytes_total'		=> $filesize,
+		);
+	}
+}