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#!/usr/bin/perl
use strict;
use warnings;
use Encode;
use AnyEvent;
use AnyEvent::Handle;
our %S;
################################################################################
# Verify whether a given domain name or IP address and port are valid.
# returns the valid ip-address + port, or 0 when not.
################################################################################
sub valid_address {
my $h = shift;
# split up address and port
my ($a, $p) = ($h =~ m/:/) ? $h =~ /(.*):(.*)/ : ($h,0);
return (undef,undef) unless ($a && $p);
# resolve hostname when needed -- shouldn't even be in the list! FIXME
#if($a =~ /[a-zA-Z]/g) {
# my $raw_addr = (gethostbyname($a))[4];
# my @octets = unpack("C4", $raw_addr);
# $a = join(".", @octets);
#}
# check if IP and port are in valid range
$a = ($a =~ '\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b') ? $a : 0;
$p = (0 < $p && $p <= 65535) ? $p : 0;
# exclude addresses where we don't want people sniffing
for (qw|192.168.(.\d*).(.\d*) 127.0.(.\d*).(.\d*) 10.0.(.\d*).(.\d*)|){$a = 0 if ($a =~ m/$_/)}
return ($a, $p);
}
sub query_master {
my $ms = shift;
for my $g (@{$ms->{games}}) {
my $cv = AnyEvent->condvar;
my $master_list = "";
my $handle; $handle = new AnyEvent::Handle(
connect => [$ms->{ip} => $ms->{port}],
timeout => 15,
poll => 'r',
on_error => sub {
print "($ms->{ip}, $g) $!\n";
$handle->destroy;
$cv->send;
},
on_eof => sub {
process_received_data($master_list, $g, $ms);
$handle->destroy;
$cv->send;
},
on_read => sub {
my $m = $_[0]->rbuf;
$_[0]->rbuf = "";
# part 1: receive \basic\\secure\$key
if ($m =~ m/\\basic\\\\secure\\/) {
# received data
my %r;
$m =~ s/\\([^\\]+)\\([^\\]+)/$r{$1}=$2/eg;
# respond to challenge
my $validate = get_validate_string($S{game}->{$g}->{key}, $r{secure}, $r{enctype}||0);
# print and send response
$handle->push_write("\\gamename\\$g\\location\\0\\validate\\$validate\\final\\");
#part 3: also request the list \list\gamename\ut -- skipped in UCC applets
$handle->push_write("\\list\\\\gamename\\$g\\final\\");
}
# part 3b: receive the entire list in multiple steps.
if ($m =~ m/\\ip\\/) { $master_list .= $m; }
}
);
$cv->recv;
}
}
sub process_received_data {
my ($buf, $g, $ms) = @_;
$buf = encode('UTF-8', $buf);
#counter
my $c = 0;
# parse $buf into an array of [ip, port]
foreach my $l (split(/\\/, $buf)) {
# search for \ip\255.255.255.255:7778\, contains ':'
if ($l =~ /:/) {
my ($a,$p) = valid_address($l);
next unless ($a && $p);
db_add_server(ip => $a, port => $p);
$c++;
}
}
print "found $c \t$g \taddresses at $ms->{ip}.\n" if ($c > 0 );
}
1;
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