98 lines
2.2 KiB
Perl
98 lines
2.2 KiB
Perl
#!/usr/bin/perl -w
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use strict;
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use Net::DNS;
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sub usage {
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print STDERR "Usage: $0 domainname-or-ip-address\n";
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exit(1);
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}
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usage() unless (@ARGV == 1);
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my $res = new Net::DNS::Resolver;
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if ($ARGV[0] =~ m/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/) {
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check_ptr($ARGV[0]);
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} else {
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check_a($ARGV[0]);
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# check_ns($ARGV[0]);
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}
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exit 0;
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my %addr_to_name;
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my %name_to_addr;
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sub check_ptr {
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my ($addr, $name) = @_;
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my @names;
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if (defined $addr_to_name{$addr}) {
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@names = @{ $addr_to_name{$addr} };
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} else {
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# XXX - ipv6?
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my $q = join('.', reverse (split(/\./, $addr)), "in-addr", "arpa");
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my $reply = $res->send($q, 'PTR');
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for my $ans ($reply->answer) {
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if ($ans->type eq 'PTR') {
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push @names, $ans->ptrdname;
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} else {
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die "cannot happen";
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}
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}
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if (@names == 0) {
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print "[$addr] $q has no PTR record\n";
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}
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$addr_to_name{$addr} = \@names;
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}
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if ($name) {
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unless (grep { $_ eq $name } @names) {
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print "$name not found in PTR records of [$addr]\n";
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}
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return;
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}
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for my $name (@names) {
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check_a($name, $addr);
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}
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}
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sub check_a {
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my ($name, $addr) = @_;
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my @addrs;
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if (defined $name_to_addr{$name}) {
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@addrs = @{ $name_to_addr{$name} };
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} else {
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my $reply = $res->send($name, 'A');
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for my $ans ($reply->answer) {
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if ($ans->type eq 'A') {
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push @addrs, $ans->address;
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} else {
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print "unexpected response to A query for $name\n";
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$ans->print;
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}
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}
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if (@addrs == 0) {
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print "$name has no A record\n";
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}
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$name_to_addr{$name} = \@addrs;
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}
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if ($addr) {
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unless (grep { $_ eq $addr } @addrs) {
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print "[$addr] not found in A records of $name\n";
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}
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return;
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}
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for my $addr (@addrs) {
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check_ptr($addr, $name);
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}
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}
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my $answer = $res->query($ARGV[0], $ARGV[1]);
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if ($answer) {
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$answer->print;
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} else {
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print STDERR "query failed: ", $res->errorstring, "\n";
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}
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# $res->nameservers($ARGV[2]);
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