#!/usr/bin/perl
 
use Socket;
use Carp;
use FileHandle;
 
 
 
 
# (1) use port 80 by default, unless overridden on command line
$port = 80;
 
# (2) create local TCP socket and set it to listen for connections
 
socket(S,PF_INET,SOCK_STREAM,getprotobyname('tcp')) || die ("ERROR:Con
+nection Creation Failed\n");
setsockopt(S, SOL_SOCKET, SO_REUSEADDR, 1) || die ("ERROR: setsockopt(
+) Failed\n");
bind(S, sockaddr_in($port, INADDR_ANY)) || die ("ERROR: bind() Failed\
+n");
listen(S, SOCKMAXCONN) || die ("ERROR: listen() Failed\n");
 
 
# (3) print a startup message
printf("    <<<Type-O-Serve Accepting on Port % d>>>\n\n",$port);
 
while (1)
{
    # (4) wait for a connection C
    $cport_caddr = accept(C, S);
    ($cport,$caddr) = sockaddr_in($cport_caddr);
    C->autoflush(1);
 
    # (5) print who the connection is from
    $cname = gethostbyaddr($caddr,AF_INET);
 
    print "Host: $cname\n";
 
    # (6) read request msg until blank line, and print on screen
    $temp = <C>;
    ($method, $request, $http) = split(" ",$temp);
    # check whether it's / in which case make it index.html 
    if($request eq "/"){
        $request = "/index.html";
    }
    # remove .. to filter directory traversal attacks
    $request =~ s/\.\.//;
    #check file exists
    if ( -e "./htdocs/$request" ){
        print "200 - $cname $request\n";
        $page="";
        open FILE, "<./htdocs/$request";
        while(<FILE>){
                $page .= $_;
        }
        close(FILE);
        print C "HTTP/1.0 200 OK\r\n";
        print C "Content-type: text/html\r\n";
        print C "\r\n";
        print C "$page";
 
    }else{
        print "404 - $cname $request\n"; 
        print C "HTTP/1.0 404\r\n";
        print C "Content-type: text/html\r\n";
        print C "\r\n";
        print C "<html><head><title>404 Page Not Found</title><head>";
        print C "<body>404 - $request not found</body></html>";
    }
    close(C);
}

[download]
This is a very simple webserver i know that :s but I am joining a compatition and i want to make a simple WAF(Web Application Firewall) so I made the webserver just to make it as a enviroment to make the firewall work the firewall idea is to filter URL content like if some one wrote http://localhost/index.php?p=' He'll be rejected coz there is a rule in a blacklist file doesn't allow this kind of requets so how to get the rules from a text file and match them with the URL?
the rules are Regex rules the idea is like mod_security and if you couldn't make it get the rules from a file just give me a simple code for doing it directly from the code .
please can anyone help me in doing this i really need it i have to give it to them tomorrow

In reply to webserver - firewall [simple] by -=Mizo=-

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