2008-06-08
This is sample code and a proof of concept, if you are interested in a well crafted webserver written with PHP, I suggest Nanoweb.

Why the hell would one want to write a webserver in PHP?

Well, for the same reason one would write a proof of concept webserver in any other programming language; it needed to be done. Actually, this started out as a test of using sockets for inter-application communication on a network and was written to run using PHP4 on a Macintosh. Since I could either delete the file and be done with it, or share the file and maybe help someone, I'm opting for the share and help.

Here you go.....

#!/usr/bin/env php -q
<?php

//function get_include_contents
// input : path to a php file
// output : the parsed text of the php file
function get_include_contents($filename)
{
echo "parsing: $filenamen";
if (is_file($filename))
{
ob_start();
include $filename;
$contents = ob_get_contents();
ob_end_clean();
return $contents;
}
return false;
}

function get_file_extension($file)
{
preg_match("/.([a-z0-9.]*)/i",$file,$matches);
$file_extension=$matches[1];
return $file_extension;
}
function get_path_to_file($request)
{
global $pwd;
global $default_http_dir;
return $pwd."/".$default_http_dir.$request;
}
function get_referer($text)
{
preg_match("/10000(/S*)/i",$text,$matches);
$referer = $matches[1];
return $referer;
}


//path to php
$php_path="/usr/local/php5/bin/php";
echo"starting server...n";
//we want to run indefinitely
set_time_limit(0);
//we need to output info to the terminal as soon as we can
ob_implicit_flush();
//define a bunch of variables
//what address are we binding to?
$bind_address='127.0.0.1';
//access port
$port=10000;
//what is the default file?
$default_array= array("index.php","index.htm","index.html");
//set the default dir for files
$default_http_dir = "webroot";
//where are we?
$pwd=trim(`pwd`);

//start connecting sockets
$socket_resource=socket_create(AF_INET,SOCK_STREAM,0) or die("socket_create()failed.");
socket_bind($socket_resource,$bind_address,$port) or die("socket_bind()failed");
socket_listen($socket_resource,5) or die("socket_listen()failed");
echo "Server is up and running ....n";
do //this is the MAIN loop
{
if(($accept_socket_resource=socket_accept($socket_resource))<0)
{
echo "socket_accept() failedn";
break;
}
if(FALSE===($buffer_text=socket_read($accept_socket_resource,2048)))
{
echo "socket_read() failedn";
break;
}
preg_match("/ .+ /i",$buffer_text,$matches);
$full_request = trim($matches[0]);
$request_and_arguments = explode("?",$full_request);
$request = urldecode( $request_and_arguments[0] );
$arguments=$request_and_arguments[1];
// if we have some get vars, lets make a $_GET[] array set
if($arguments)
{
$args_n_vars = explode("&",$arguments);
foreach($args_n_vars as $arg_n_var)
{
list($var,$value) = explode("=",$arg_n_var);
$_GET[$var]=urldecode($value);

}

}

if(substr($request,strlen($request)-1,1)=="/")
{
//find the first default file
foreach($default_array as $default_file)
{
$tfile = stripslashes($pwd)."/".$default_http_dir."/".$default_file;
if( file_exists($tfile) )
{
$request = "/$default_file";
break;
}
}
}

$file_extension = get_file_extension($request);
$path_to_file = get_path_to_file($request);
//what mime type should be returned?
switch($file_extension)
{
case "png":
$mime="image/png";
break;
case "gif":
$mime="image/gif";
break;
case "jpg":
$mime="image/jpeg";
break;
case "zip":
$mime="aplication/zip";
break;
case "exe":
$mime="aplication/exe";
break;
case "bmp":
$mime="image/bmp";
break;
case "mov":
$mime="video/quicktime";
break;
case "mp3":
$mime="video/mpeg";
break;
case "mpeg":
$mime="video/mpeg";
break;
case "txt":
$mime="text/plain";
break;
default:
$mime="text/html";
break;
}
if(file_exists($path_to_file))
{
//we have a file to return to the user
$return_file = true;
//is this a php file?
if($file_extension == "php")
{
//we had better parse the php
//where are we now?
$start_dir= getcwd();
//cd to the php files dir
$php_file_dir = dirname( $path_to_file);
$php_file = basename( $path_to_file );
chdir($php_file_dir);
//run the included PHP file
$file_contents = get_include_contents("$php_file");
$file_length=strlen($file_contents);
//return to the start dir
chdir($start_dir);

}else{
echo "serving: $path_to_file";
$file_contents = file_get_contents($path_to_file);
$file_length=filesize($path_to_file);
}
if($return_file)
{
$today=date("m.d.y");
$output="HTTP/1.0 200 OKrnServer: PHP Proof of ConceptrnDate:$todayrnConnection:closernContent-Length:$file_lengthrnContent-Type:$mimernrn";
socket_send($accept_socket_resource,$output,strlen($output),0);
$start_chunk=0;
while($start_chunk<=$file_length)
{
$text_chunk=substr($file_contents,$start_chunk,2048);
socket_write($accept_socket_resource,$text_chunk,strlen($text_chunk));
$start_chunk+=2048;
}
}
}else{
$output="HTTP/1.0 404 OBJECT NOT FOUNDrnServer: PHP ServerrnConnection: closernrn";
socket_write($accept_socket_resource,$output,strlen($output));
}
socket_close($accept_socket_resource);
}while(true);
socket_close($socket_resource);
?>




Geez, I really don't like looking at my old code since it always makes me think about how I would re-write differently if I were to write it today, and this code is about 3-4 years old.
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