1#!/usr/bin/perl 2 3# Copyright (C) Internet Systems Consortium, Inc. ("ISC") 4# 5# SPDX-License-Identifier: MPL-2.0 6# 7# This Source Code Form is subject to the terms of the Mozilla Public 8# License, v. 2.0. If a copy of the MPL was not distributed with this 9# file, you can obtain one at https://mozilla.org/MPL/2.0/. 10# 11# See the COPYRIGHT file distributed with this work for additional 12# information regarding copyright ownership. 13 14use IO::Socket; 15use IO::File; 16use strict; 17 18# Ignore SIGPIPE so we won't fail if peer closes a TCP socket early 19local $SIG{PIPE} = 'IGNORE'; 20 21# Flush logged output after every line 22local $| = 1; 23 24my $server_addr = "10.53.0.4"; 25if (@ARGV > 0) { 26 $server_addr = @ARGV[0]; 27} 28 29my $localport = int($ENV{'PORT'}); 30if (!$localport) { $localport = 5300; } 31 32my $udpsock = IO::Socket::INET->new(LocalAddr => "$server_addr", 33 LocalPort => $localport, Proto => "udp", Reuse => 1) or die "$!"; 34my $tcpsock = IO::Socket::INET->new(LocalAddr => "$server_addr", 35 LocalPort => $localport, Proto => "tcp", Listen => 5, Reuse => 1) or die "$!"; 36 37print "listening on $server_addr:$localport.\n"; 38 39my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!"; 40print $pidf "$$\n" or die "cannot write pid file: $!"; 41$pidf->close or die "cannot close pid file: $!";; 42sub rmpid { unlink "ans.pid"; exit 1; }; 43 44$SIG{INT} = \&rmpid; 45$SIG{TERM} = \&rmpid; 46 47# Main 48for (;;) { 49 my $rin; 50 my $rout; 51 52 $rin = ''; 53 vec($rin, fileno($udpsock), 1) = 1; 54 vec($rin, fileno($tcpsock), 1) = 1; 55 56 select($rout = $rin, undef, undef, undef); 57 58 if (vec($rout, fileno($udpsock), 1)) { 59 printf "UDP request\n"; 60 my $buf; 61 $udpsock->recv($buf, 512); 62 } elsif (vec($rout, fileno($tcpsock), 1)) { 63 printf "TCP request\n"; 64 } 65} 66