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Diffstat (limited to 'bin/tests/system/chain/ans3/ans.pl')
| -rw-r--r-- | bin/tests/system/chain/ans3/ans.pl | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/bin/tests/system/chain/ans3/ans.pl b/bin/tests/system/chain/ans3/ans.pl new file mode 100644 index 0000000..271b2a4 --- /dev/null +++ b/bin/tests/system/chain/ans3/ans.pl @@ -0,0 +1,131 @@ +#!/usr/bin/env 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 strict; +use warnings; + +use IO::File; +use Getopt::Long; +use Net::DNS::Nameserver; + +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; + +my $localaddr = "10.53.0.3"; + +my $localport = int($ENV{'PORT'}); +if (!$localport) { $localport = 5300; } + +my $verbose = 0; +my $ttl = 60; +my $zone = "example.broken"; +my $nsname = "ns3.$zone"; +my $synth = "synth-then-dname.$zone"; +my $synth2 = "synth2-then-dname.$zone"; + +sub reply_handler { + my ($qname, $qclass, $qtype, $peerhost, $query, $conn) = @_; + my ($rcode, @ans, @auth, @add); + + print ("request: $qname/$qtype\n"); + STDOUT->flush(); + + if ($qname eq "example.broken") { + if ($qtype eq "SOA") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass SOA . . 0 0 0 0 0"); + push @ans, $rr; + } elsif ($qtype eq "NS") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass NS $nsname"); + push @ans, $rr; + $rr = new Net::DNS::RR("$nsname $ttl $qclass A $localaddr"); + push @add, $rr; + } + $rcode = "NOERROR"; + } elsif ($qname eq "cname-to-$synth2") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass CNAME name.$synth2"); + push @ans, $rr; + $rr = new Net::DNS::RR("name.$synth2 $ttl $qclass CNAME name"); + push @ans, $rr; + $rr = new Net::DNS::RR("$synth2 $ttl $qclass DNAME ."); + push @ans, $rr; + $rcode = "NOERROR"; + } elsif ($qname eq "$synth" || $qname eq "$synth2") { + if ($qtype eq "DNAME") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass DNAME ."); + push @ans, $rr; + } + $rcode = "NOERROR"; + } elsif ($qname eq "name.$synth") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass CNAME name."); + push @ans, $rr; + $rr = new Net::DNS::RR("$synth $ttl $qclass DNAME ."); + push @ans, $rr; + $rcode = "NOERROR"; + } elsif ($qname eq "name.$synth2") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass CNAME name."); + push @ans, $rr; + $rr = new Net::DNS::RR("$synth2 $ttl $qclass DNAME ."); + push @ans, $rr; + $rcode = "NOERROR"; + # The following three code branches referring to the "example.dname" + # zone are necessary for the resolver variant of the CVE-2021-25215 + # regression test to work. A named instance cannot be used for + # serving the DNAME records below as a version of BIND vulnerable to + # CVE-2021-25215 would crash while answering the queries asked by + # the tested resolver. + } elsif ($qname eq "ns3.example.dname") { + if ($qtype eq "A") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass A 10.53.0.3"); + push @ans, $rr; + } + if ($qtype eq "AAAA") { + my $rr = new Net::DNS::RR("example.dname. $ttl $qclass SOA . . 0 0 0 0 $ttl"); + push @auth, $rr; + } + $rcode = "NOERROR"; + } elsif ($qname eq "self.example.self.example.dname") { + my $rr = new Net::DNS::RR("self.example.dname. $ttl $qclass DNAME dname."); + push @ans, $rr; + $rr = new Net::DNS::RR("$qname $ttl $qclass CNAME self.example.dname."); + push @ans, $rr; + $rcode = "NOERROR"; + } elsif ($qname eq "self.example.dname") { + if ($qtype eq "DNAME") { + my $rr = new Net::DNS::RR("$qname $ttl $qclass DNAME dname."); + push @ans, $rr; + } + $rcode = "NOERROR"; + } else { + $rcode = "REFUSED"; + } + return ($rcode, \@ans, \@auth, \@add, { aa => 1 }); +} + +GetOptions( + 'port=i' => \$localport, + 'verbose!' => \$verbose, +); + +my $ns = Net::DNS::Nameserver->new( + LocalAddr => $localaddr, + LocalPort => $localport, + ReplyHandler => \&reply_handler, + Verbose => $verbose, +); + +$ns->main_loop; |