62 lines
1.7 KiB
Perl
Executable File
62 lines
1.7 KiB
Perl
Executable File
#!/usr/bin/perl
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# A simple nameserver that responds only to queries for "A" records of
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# "mister.edward.hyde". This program is an almost verbatim copy of the
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# Net::DNS::Nameserver example at:
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# http://search.cpan.org/dist/Net-DNS/lib/Net/DNS/Nameserver.pm#EXAMPLE
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use strict;
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use warnings;
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use Net::DNS::Nameserver;
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sub reply_handler
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{
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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 "Received query from $peerhost to " . $conn->{sockhost} . "\n";
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$query->print;
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my $ttl = 0;
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my $rdata = "";
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$rcode = "NOERROR";
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if ($qtype eq "A")
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{
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if ($qname eq "foo.red.hat") { $rdata = "127.126.125.124" }
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elsif ($qname eq "bar.foo.red.hat") { $rdata = "127.126.125.124" }
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elsif ($qname eq "red.hat") { $rdata = "127.126.125.124" }
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else { $rcode = "NXDOMAIN" }
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}
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elsif ($qtype eq "AAAA")
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{
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if ($qname eq "foo.red.hat") { $rdata = "::1" }
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elsif ($qname eq "bar.foo.red.hat") { $rdata = "::1" }
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elsif ($qname eq "red.hat") { $rdata = "::1" }
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else { $rcode = "NXDOMAIN" }
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}
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else
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{
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$rcode = "NXDOMAIN";
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}
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if ($rcode == "NOERROR")
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{
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my $rr = new Net::DNS::RR("$qname $ttl $qclass $qtype $rdata");
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push @ans, $rr;
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}
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# mark the answer as authoritive (by setting the 'aa' flag
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return ($rcode, \@ans, \@auth, \@add, {aa => 1});
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}
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my $ns = new Net::DNS::Nameserver(
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LocalPort => 53,
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ReplyHandler => \&reply_handler,
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Verbose => 1
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)
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|| die "couldn't create nameserver object\n";
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$ns->main_loop;
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