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package MasterServer::Util::UDPBrowser;
use strict;
use warnings;
use AnyEvent::Handle::UDP;
use Socket qw(sockaddr_in inet_ntoa);
use Exporter 'import';
our @EXPORT = qw| udpbrowser_host |;
################################################################################
## Wait for incoming UDP messages from game clients and other masterservers.
## In contrary to the compliant TCP browser host, this function handles the
## request in a single query and responds with a single udp list.
## This read-only method is slightly unsafe as it bypasses the secure/validate
## challenge; however, this list is freely available over the JSON api, so not
## worth protecting against exploits.
## Request format: \echo\request\gamename\postal2\list\\final\
################################################################################
sub udpbrowser_host {
# self, handle, packed address, buffer
my ($self, $udp, $paddress, $buffer) = @_;
my $rx = $self->data2hashref($buffer);
my $response = "";
# unpack ip from packed client address
my ($port, $iaddr) = sockaddr_in($paddress);
my $addr = inet_ntoa($iaddr);
# list request with valid gamename and list request
if ($rx->{gamename} && exists $rx->{list}) {
# get list and log
$response = $self->generate_list($rx->{gamename}, $rx->{list});
$self->log("list","$addr:$port retrieved the list for $rx->{gamename} over UDP");
}
else {
# log error
$response = "\\echo\\incorrect request format";
$self->log("warning","$addr:$port failed to retrieve the list over UDP for ".
($rx->{gamename} || "empty_gamename"));
}
# close query with final tag
$response .= "\\final\\";
# split the response in chunks of 512 bytes and send (for large lists)
while (length $response > 512) {
my $chunk = substr $response, 0, 512, '';
$udp->push_send($chunk, $paddress);
}
# last <512 chunk
$udp->push_send($response, $paddress);
}
1;
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