#!/usr/bin/perl # Copyright (C) Internet Systems Consortium, Inc. ("ISC") # # SPDX-License-Identifier: MPL-2.0 # # This Source Code Form is subject to the terms of the Mozilla Public # License, v. 2.0. If a copy of the MPL was not distributed with this # file, you can obtain one at https://mozilla.org/MPL/2.0/. # # See the COPYRIGHT file distributed with this work for additional # information regarding copyright ownership. use IO::Socket; use IO::File; use strict; # Ignore SIGPIPE so we won't fail if peer closes a TCP socket early local $SIG{PIPE} = 'IGNORE'; # Flush logged output after every line local $| = 1; my $server_addr = "10.53.0.4"; if (@ARGV > 0) { $server_addr = @ARGV[0]; } my $localport = int($ENV{'PORT'}); if (!$localport) { $localport = 5300; } my $udpsock = IO::Socket::INET->new(LocalAddr => "$server_addr", LocalPort => $localport, Proto => "udp", Reuse => 1) or die "$!"; print "listening on $server_addr:$localport.\n"; my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!"; print $pidf "$$\n" or die "cannot write pid file: $!"; $pidf->close or die "cannot close pid file: $!";; sub rmpid { unlink "ans.pid"; exit 1; }; $SIG{INT} = \&rmpid; $SIG{TERM} = \&rmpid; # Main for (;;) { my $rin; my $rout; $rin = ''; vec($rin, fileno($udpsock), 1) = 1; select($rout = $rin, undef, undef, undef); if (vec($rout, fileno($udpsock), 1)) { printf "UDP request\n"; my $buf; $udpsock->recv($buf, 512); } }