Help making a php proxy

Picatta · January 30, 2007

So, I'm trying to make a new proxy in php. However, a problem I've run into is that it can't handle biary data. I'm thinking it is with the way I'm filtering the headers, but I'm not shure... (heres an example: http://multithreading.ath.cx:24/myproxy/proxy.php?page=http://www.mixfevers.com)

Whenver I try to proxify an image, I get

[quote]The image “http://localhost:24/myproxy/proxy.php?page=http://mixfevers.com/main/includes/images/block2.gif” cannot be displayed, because it contains errors.[/quote]

I'm not shure what to do...

[code]
<?php
if (!function_exists(str_ireplace)) {
function str_ireplace($repit,$repl,$src) {
return str_replace(strtolower($repit), strtolower($repl), strtolower($src));
}
}
function encode($url) {
$old = array('://', 'page=', '?', '=', 'q');
$new = array('<[pro]>', '<[pgespchr]>', '<[qmark]>', '<[eqmark]>', '<[qchr]>');
$url = str_ireplace($old, $new, $url);
return $url;
}
function decode($url) {
$old = array('://', 'page=', '?', '=', 'q');
$new = array('<[pro]>', '<[pgespchr]>', '<[qmark]>', '<[eqmark]>', '<[qchr]>');
$url = str_ireplace($new, $old, $url);
return $url;
}
if (!isset($_GET['page'])) {
if (!isset($_GET['browse'])) {
print "
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en\">
<head>

<title>
A simple web mirror script
</title>
</head>
<body>
<form action='?browse' method='GET'>
<div id='form'>
URL: <input type='text' name='q' /><br /><br />
<input type='submit' value='browse' />
<input type='hidden' name='browse' />
</div>
</form>
</body>
</html>
";
} else {
//Print frame page
$page = $_GET['q']; //Get the requested page
print "
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Frameset//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>
<title>
A simple web proxy
</title>
</head>
<frameset rows='5%,*' scrolling='auto' border='0'>
<frame src='?page&header' />
<frame src='?page=" . encodeurl($page) . "' />
<noframes>
<body>
myProxy web proxy by Coprolal1an requires a frame-enabled browser such as Firefox.
</body>
</noframes>
</frameset>
</html>
";
}
} elseif ((isset($_GET['page'])) AND (!isset($_GET['header']))) {
//Print requested page
$page = decode($_GET['page']); //Get the page the user requested
$page = explode('://', $page);
$prefix = $page[0];
$page = $page[1];
$page = explode('/', $page, 2);
$host = explode('.', $page[0]);
if (strpos($host[0], 'www') !== FALSE) {
unset($host[0]);
}
$host = implode('.', $host);
$path = '/' . $page[1];
if ($prefix == 'https') {
$port = 443;
$pre = 'ssl://www.';
} else {
$port = 80;
$pre = 'www.';
}
$fp = fsockopen($pre . $host, $port, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
$out = "GET $path HTTP/1.1\r\n";
$out .= "Host: $pre$host\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
while (!feof($fp)) {
$buffer .= fgets($fp, 128);
}
fclose($fp);
$buffer = explode('<', $buffer);
$header = $buffer[0];
$header = preg_split("/\n/", $header);
$lines = count($header);
for ($int=0; $int<$lines; $int++) {
$line = $header[$int];
if (!empty($line) AND
(strpos($line,'Transfer-Encoding') === FALSE) AND
(strpos($line,'Location:') === FALSE) AND
(strpos($line,'location:') === FALSE))
{
header($line);
//print $line;
}
}
$buffer[0] = "\n";
$buffer = implode('<', $buffer);
$buffer = explode('0', $buffer);
$end = count($buffer)-1;
unset($buffer[$end]);
$buffer = implode('0', $buffer);
$buffer = preg_replace("/(http|https):\/\/(.*?)('|\"| )/", ("?page=$1://$2$3"), $buffer);
print $buffer;
}
} else {
print "Proxified page below<br />";
}
?>
[/code]

It uses frame because I figured that would be easiest.

NOTE; The encode and decode functions will eventually be for parsing urls.

Picatta · January 30, 2007

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