Perl实现的Linux下socket代理服务器

大家提供了许多linux开代理的方法，一般用到python等语言，一些服务器可能不会安装，然而perl可以说是linux标配的语言，给大家一款Perl语言的socket代理，代码非常少，而且还支持密码，效果还是不错，感觉很稳定。

#!/usr/bin/perl

$auth_enabled = 0;
$auth_login = "hidden";
$auth_pass = "hidden";
$port = 44269;

use IO::Socket::INET;

$SIG{'CHLD'} = 'IGNORE';
$bind = IO::Socket::INET->new(Listen=>10, Reuse=>1, LocalPort=>$port) or die "Нельзя забиндить порт $port\n";

while($client = $bind->accept()) {
$client->autoflush();

if(fork()){ $client->close(); }
else { $bind->close(); new_client($client); exit(); }
}

sub new_client {
local $t, $i, $buff, $ord, $success;
local $client = $_[0];
sysread($client, $buff, 1);

if(ord($buff) == 5) {
sysread($client, $buff, 1);
$t = ord($buff);

unless(sysread($client, $buff, $t) == $t) { return; }

$success = 0;
for($i = 0; $i < $t; $i++) {
$ord = ord(substr($buff, $i, 1));
if($ord == 0 && !$auth_enabled) {
 syswrite($client, "\x05\x00", 2);
 $success++;
 break;
}
elsif($ord == 2 && $auth_enabled) {
 unless(do_auth($client)){ return; }
 $success++;
 break;
}
}

if($success) {
$t = sysread($client, $buff, 3);

if(substr($buff, 0, 1) == '\x05') {
 if(ord(substr($buff, 2, 1)) == 0) {
 ($host, $raw_host) = socks_get_host($client);
 if(!$host) { return; }
 ($port, $raw_port) = socks_get_port($client);
 if(!$port) { return; }
 $ord = ord(substr($buff, 1, 1));
 $buff = "\x05\x00\x00".$raw_host.$raw_port;
 syswrite($client, $buff, length($buff));
 socks_do($ord, $client, $host, $port);
 }
}
} else { syswrite($client, "\x05\xFF", 2); };
}
$client->close();
}

sub do_auth {
local $buff, $login, $pass;
local $client = $_[0];

syswrite($client, "\x05\x02", 2);
sysread($client, $buff, 1);

if(ord($buff) == 1) {
sysread($client, $buff, 1);
sysread($client, $login, ord($buff));
sysread($client, $buff, 1);
sysread($client, $pass, ord($buff));

if($login eq $auth_login && $pass eq $auth_pass) {
syswrite($client, "\x05\x00", 2);
return 1;
} else { syswrite($client, "\x05\x01", 2); }
}

$client->close();
return 0;
}

sub socks_get_host {
local $client = $_[0];
local $t, $ord, $raw_host;
local $host = "";

sysread($client, $t, 1);
$ord = ord($t);
if($ord == 1) {
sysread($client, $raw_host, 4);
@host = $raw_host =~ /(.)/g;
$host = ord($host[0]).".".ord($host[1]).".".ord($host[2]).".".ord($host[3]);
} elsif($ord == 3) {
sysread($client, $raw_host, 1);
sysread($client, $host, ord($raw_host));
$raw_host .= $host;
} elsif($ord == 4) {
#ipv6 - not supported
}

return ($host, $t.$raw_host);
}

sub socks_get_port {
local $client = $_[0];
local $raw_port, $port;
sysread($client, $raw_port, 2);
$port = ord(substr($raw_port, 0, 1)) << 8 | ord(substr($raw_port, 1, 1));
return ($port, $raw_port);
}

sub socks_do {
local($t, $client, $host, $port) = @_;

if($t == 1) { socks_connect($client, $host, $port); }
elsif($t == 2) { socks_bind($client, $host, $port); }
elsif($t == 3) { socks_udp_associate($client, $host, $port); }
else { return 0; }

return 1;
}

sub socks_connect {
my($client, $host, $port) = @_;
my $target = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port, Proto => 'tcp', Type => SOCK_STREAM);

unless($target) { return; }

$target->autoflush();
while($client || $target) {
my $rin = "";
vec($rin, fileno($client), 1) = 1 if $client;
vec($rin, fileno($target), 1) = 1 if $target;
my($rout, $eout);
select($rout = $rin, undef, $eout = $rin, 120);
if (!$rout && !$eout) { return; }
my $cbuffer = "";
my $tbuffer = "";

if ($client && (vec($eout, fileno($client), 1) || vec($rout, fileno($client), 1))) {
my $result = sysread($client, $tbuffer, 1024);
if (!defined($result) || !$result) { return; }
}

if ($target && (vec($eout, fileno($target), 1) || vec($rout, fileno($target), 1))) {
my $result = sysread($target, $cbuffer, 1024);
if (!defined($result) || !$result) { return; }
}

if ($fh && $tbuffer) { print $fh $tbuffer; }

while (my $len = length($tbuffer)) {
my $res = syswrite($target, $tbuffer, $len);
if ($res > 0) { $tbuffer = substr($tbuffer, $res); } else { return; }
}

while (my $len = length($cbuffer)) {
my $res = syswrite($client, $cbuffer, $len);
if ($res > 0) { $cbuffer = substr($cbuffer, $res); } else { return; }
}
}
}

sub socks_bind {
my($client, $host, $port) = @_;
}

sub socks_udp_associate {
my($client, $host, $port) = @_;
}