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#!/usr/bin/perl $|=1; # Run this with Faucet. #use strict; use IO::Socket; use Net::hostent; use bytes; my $remote=$ARGV[0]; my $buf, $byte, @head, $up, $user, $err, $kidpid, $sock, $op, $server; my $destip, $destport, $i; ### Read in first bytes of the Socks header. read(STDIN,$buf,4); @head=unpack("CCn",$buf); read(STDIN,$buf,4); $ip=inet_ntoa($buf); $user=''; while(read(STDIN,$buf,1)) { last unless(ord $buf); $user .= $buf; } ### Do some insanity checking. $err=91; $op=-1; # Assume Not OK... $destip=pack("N",0); $destport=0; if($head[0] == 4) { # SOCKS 4 if($head[1] == 1) { # CONNECT $sock=IO::Socket::INET->new(Proto=>"tcp", PeerAddr=>$ip, PeerPort=>$head[2]); if($sock) { $sock->autoflush(1); $err=90; } } elsif($head[1] == 2) { # BIND $destport=$$; $destip=inet_aton($remote); $server=IO::Socket::INET->new(Proto=>'tcp', LocalPort=>$$, LocalAddr=>$remote, Listen=>1, Reuse=>1); print pack("CCn",0,90,$destport).$destip; if($sock=$server->accept()) { $sock->autoflush(1); if($sock->peerhost eq $ip) { $err=90; } else { close $sock; } } close $server; } } print pack("CCn",0,$err,$destport).$destip; exit if($err>90); die "can't fork: $!" unless defined($kidpid=fork()); if($kidpid) { while(read($sock,$byte,1)){ print STDOUT $byte; } kill("TERM", $kidpid); } else { while (read(STDIN,$byte,1)) { print $sock $byte; } }

In reply to SOCKS4 Server in Perl by strredwolf

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