git

1
use strict;
2
use IO::Select;
3
use IO::Socket::UNIX;
4
use IO::Socket::INET;
5

6
my $path = shift;
7

8
unlink($path);
9
my $server = IO::Socket::UNIX->new(Listen => 1, Local => $path)
10
	or die "unable to listen on $path: $!";
11

12
$| = 1;
13
print "ready\n";
14

15
while (my $client = $server->accept()) {
16
	sysread $client, my $buf, 8;
17
	my ($version, $cmd, $port, $ip) = unpack 'CCnN', $buf;
18
	next unless $version == 4; # socks4
19
	next unless $cmd == 1; # TCP stream connection
20

21
	# skip NUL-terminated id
22
	while (sysread $client, my $char, 1) {
23
		last unless ord($char);
24
	}
25

26
	# version(0), reply(5a == granted), port (ignored), ip (ignored)
27
	syswrite $client, "\x00\x5a\x00\x00\x00\x00\x00\x00";
28

29
	my $remote = IO::Socket::INET->new(PeerHost => $ip, PeerPort => $port)
30
		or die "unable to connect to $ip/$port: $!";
31

32
	my $io = IO::Select->new($client, $remote);
33
	while ($io->count) {
34
		for my $fh ($io->can_read(0)) {
35
			for my $pair ([$client, $remote], [$remote, $client]) {
36
				my ($from, $to) = @$pair;
37
				next unless $fh == $from;
38

39
				my $r = sysread $from, my $buf, 1024;
40
				if (!defined $r || $r <= 0) {
41
					$io->remove($from);
42
					next;
43
				}
44
				syswrite $to, $buf;
45
			}
46
		}
47
	}
48
}
49