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|
#!/usr/bin/env perl
use lib '../lib';
use IO::Socket::Socks qw(:constants $SOCKS_ERROR);
use IO::Select;
use strict;
# return bind address as ip address like most socks5 proxyes does
$IO::Socket::Socks::SOCKS5_RESOLVE = 1;
# create socks server
my $server = IO::Socket::Socks->new(SocksVersion => 5, SocksDebug => 1, ProxyAddr => 'localhost', ProxyPort => 1080, Listen => 10)
or die $SOCKS_ERROR;
# accept connections
while()
{
my $client = $server->accept();
if($client)
{
my ($cmd, $host, $port) = @{$client->command()};
if($cmd == CMD_CONNECT)
{ # connect
# create socket with requested host
my $socket = IO::Socket::INET->new(PeerHost => $host, PeerPort => $port, Timeout => 10);
if($socket)
{
# success
$client->command_reply(REPLY_SUCCESS, $socket->sockhost, $socket->sockport);
}
else
{
# Host Unreachable
$client->command_reply(REPLY_HOST_UNREACHABLE, $host, $port);
$client->close();
next;
}
my $selector = IO::Select->new($socket, $client);
MAIN_CONNECT:
while()
{
my @ready = $selector->can_read();
foreach my $s (@ready)
{
my $readed = $s->sysread(my $data, 1024);
unless($readed)
{
# error or socket closed
warn 'connection closed';
$socket->close();
last MAIN_CONNECT;
}
if($s == $socket)
{
# return to client data readed from remote host
$client->syswrite($data);
}
else
{
# return to remote host data readed from the client
$socket->syswrite($data);
}
}
}
}
elsif($cmd == CMD_BIND)
{ # bind
# create listen socket
my $socket = IO::Socket::INET->new(Listen => 10);
if($socket)
{
# success
$client->command_reply(REPLY_SUCCESS, $socket->sockhost, $socket->sockport);
}
else
{
# request rejected or failed
$client->command_reply(REPLY_HOST_UNREACHABLE, $host, $port);
$client->close();
next;
}
while()
{
# accept new connection needed proxifycation
my $conn = $socket->accept()
or next;
$socket->close();
if($conn->peerhost ne join('.', unpack('C4', (gethostbyname($host))[4])))
{
# connected host should be same as specified in the client bind request
last;
}
$client->command_reply(REPLY_SUCCESS, $conn->peerhost, $conn->peerport);
my $selector = IO::Select->new($conn, $client);
MAIN_BIND:
while()
{
my @ready = $selector->can_read();
foreach my $s (@ready)
{
my $readed = $s->sysread(my $data, 1024);
unless($readed)
{
# error or socket closed
warn 'connection closed';
$conn->close();
last MAIN_BIND;
}
if($s == $conn)
{
# return to client data readed from remote host
$client->syswrite($data);
}
else
{
# return to remote host data readed from the client
$conn->syswrite($data);
}
}
}
last;
}
}
elsif($cmd == CMD_UDPASSOC)
{ # UDP associate
# who really need it?
# you could send me a patch
warn 'UDP assoc: not implemented';
$client->command_reply(REPLY_GENERAL_FAILURE, $host, $port);
}
else
{
warn 'Unknown command';
}
$client->close();
}
else
{
warn $SOCKS_ERROR;
}
}
sub auth
{ # add `UserAuth => \&auth, RequireAuth => 1' to the server constructor if you want to authenticate user by login and password
my $login = shift;
my $password = shift;
my %allowed_users = (root => 123, oleg => 321, ryan => 213);
return $allowed_users{$login} eq $password;
}
# tested with `curl --socks5'
|
