132 lines
3.4 KiB
Perl
132 lines
3.4 KiB
Perl
#!/usr/bin/env perl
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#
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# Copyright (C) 2014-2016 Internet Systems Consortium, Inc. ("ISC")
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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use strict;
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use warnings;
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use IO::File;
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use Getopt::Long;
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use Net::DNS::Nameserver;
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use Time::HiRes qw(usleep nanosleep);
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my $pidf = new IO::File "ans.pid", "w" or die "cannot open pid file: $!";
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print $pidf "$$\n" or die "cannot write pid file: $!";
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$pidf->close or die "cannot close pid file: $!";
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sub rmpid { unlink "ans.pid"; exit 1; };
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$SIG{INT} = \&rmpid;
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$SIG{TERM} = \&rmpid;
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my $count = 0;
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my $send_response = 0;
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sub getlimit {
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if ( -e "ans.limit") {
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open(FH, "<", "ans.limit");
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my $line = <FH>;
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chomp $line;
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close FH;
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if ($line =~ /^\d+$/) {
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return $line;
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}
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}
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return 0;
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}
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my $localaddr = "10.53.0.2";
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my $localport = 5300;
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my $verbose = 0;
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my $limit = getlimit();
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sub reply_handler {
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my ($qname, $qclass, $qtype, $peerhost, $query, $conn) = @_;
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my ($rcode, @ans, @auth, @add);
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print ("request: $qname/$qtype\n");
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STDOUT->flush();
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$count += 1;
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# Sleep 100ms to make sure that named sends both A and AAAA queries.
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usleep(100000);
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if ($qname eq "count" ) {
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if ($qtype eq "TXT") {
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my ($ttl, $rdata) = (0, "$count");
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my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
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push @ans, $rr;
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print ("\tcount: $count\n");
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}
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$rcode = "NOERROR";
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} elsif ($qname eq "reset" ) {
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$count = 0;
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$send_response = 0;
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$limit = getlimit();
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$rcode = "NOERROR";
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print ("\tlimit: $limit\n");
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} elsif ($qname eq "direct.example.org" ) {
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if ($qtype eq "A") {
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my ($ttl, $rdata) = (3600, $localaddr);
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my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
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push @ans, $rr;
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}
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$rcode = "NOERROR";
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} elsif ($qname eq "indirect1.example.org" ||
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$qname eq "indirect2.example.org" ||
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$qname eq "indirect3.example.org" ||
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$qname eq "indirect4.example.org" ||
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$qname eq "indirect5.example.org" ||
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$qname eq "indirect6.example.org" ||
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$qname eq "indirect7.example.org" ||
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$qname eq "indirect8.example.org") {
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if (! $send_response) {
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my $rr = new Net::DNS::RR("$qname 86400 $qclass NS ns1.1.example.org");
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push @auth, $rr;
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} elsif ($qtype eq "A") {
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my ($ttl, $rdata) = (3600, $localaddr);
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my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
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push @ans, $rr;
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}
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$rcode = "NOERROR";
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} elsif ($qname =~ /^ns1\.(\d+)\.example\.org$/) {
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my $next = $1 + 1;
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if ($limit == 0 || (! $send_response && $next <= $limit)) {
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my $rr = new Net::DNS::RR("$1.example.org 86400 $qclass NS ns1.$next.example.org");
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push @auth, $rr;
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} else {
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$send_response = 1;
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if ($qtype eq "A") {
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my ($ttl, $rdata) = (3600, $localaddr);
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my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
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print("\tresponse: $qname $ttl $qclass $qtype $rdata\n");
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push @ans, $rr;
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}
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}
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$rcode = "NOERROR";
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} else {
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$rcode = "NXDOMAIN";
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}
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# mark the answer as authoritive (by setting the 'aa' flag
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return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
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}
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GetOptions(
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'port=i' => \$localport,
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'verbose!' => \$verbose,
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);
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my $ns = Net::DNS::Nameserver->new(
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LocalAddr => $localaddr,
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LocalPort => $localport,
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ReplyHandler => \&reply_handler,
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Verbose => $verbose,
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);
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$ns->main_loop;
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