| 1 | #!/usr/bin/perl
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| 2 | # Import a BIND zone file
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| 3 | ##
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| 4 | # Copyright 2020 Kris Deugau <kdeugau@deepnet.cx>
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| 5 | #
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| 6 | # This program is free software: you can redistribute it and/or modify
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| 7 | # it under the terms of the GNU General Public License as published by
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| 8 | # the Free Software Foundation, either version 3 of the License, or
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| 9 | # (at your option) any later version.
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| 10 | #
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| 11 | # This program is distributed in the hope that it will be useful,
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | # GNU General Public License for more details.
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| 15 | #
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| 16 | # You should have received a copy of the GNU General Public License
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| 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | ##
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| 19 |
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| 20 | use strict;
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| 21 | use warnings;
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| 22 | use Data::Dumper;
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| 23 |
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| 24 | use lib '.';
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| 25 | use DNSDB;
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| 26 |
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| 27 | my $dnsdb = new DNSDB;
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| 28 | my $doimport = 0;
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| 29 |
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| 30 | #print Dumper(\%reverse_typemap);
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| 31 |
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| 32 | my $zname = shift @ARGV;
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| 33 | my $rev = 'n';
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| 34 | my $zid;
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| 35 |
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| 36 | my %amap;
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| 37 | my %namemap;
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| 38 | my %cmap;
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| 39 |
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| 40 | if ($zname =~ /\.arpa\.?$/ || $zname =~ m,^[\d./]+$,) {
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| 41 | $rev = 'y';
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| 42 | $zname = _zone2cidr($zname) if $zname =~ /\.arpa\.?$/;
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| 43 | $zid = $dnsdb->revID($zname,':ANY:');
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| 44 | if ($zid) {
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| 45 | $zname = new NetAddr::IP $zname;
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| 46 | $zname = DNSDB::_ZONE($zname, 'ZONE', 'r', '.').($zname->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 47 | }
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| 48 | } else {
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| 49 | $zid = $dnsdb->domainID($zname,':ANY:');
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| 50 | }
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| 51 |
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| 52 | die "zone $zname not on file\n" if !$zid;
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| 53 |
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| 54 | # still no sane way to expose a human-friendly view tag on the command line.
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| 55 | my $view = shift @ARGV;
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| 56 | $view = '' if !$view;
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| 57 |
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| 58 | ##fixme: retrieve defttl from SOA record
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| 59 | my $zonettl = 900;
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| 60 | my $defttl = $zonettl;
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| 61 | my $recbase = $zname; # to append to unqualified names
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| 62 |
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| 63 | # need to spin up a full state machine-ish thing, because BIND zone files are all about context
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| 64 | # see ch4, p56-72 in the grasshopper book
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| 65 | my $prevlabel = '';
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| 66 | my $curlabel = '';
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| 67 |
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| 68 | while (<>) {
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| 69 | chomp;
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| 70 | next if /^\s*$/;
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| 71 | next if /^\s*;/;
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| 72 | if (my ($macro,$mdetail) = (/^\s*\$(TTL|ORIGIN|INCLUDE|GENERATE)\s+(.+)/) ) {
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| 73 | # macro sort of thing; $TTL and $ORIGIN most common. $INCLUDE is a thing, expect it to be rare in live use tho
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| 74 | if ($macro eq 'TTL') {
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| 75 | if ($mdetail =~ /^\d+$/) {
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| 76 | $defttl = $mdetail;
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| 77 | } else {
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| 78 | warn "invalid \$TTL: $_\n";
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| 79 | }
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| 80 | } elsif ($macro eq 'ORIGIN') {
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| 81 | ##fixme: going to skip the stupid case of "$ORIGIN com." and the like that lie
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| 82 | # between . and the root domain we were told we're importing; anyone using such
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| 83 | # a mess outside the root servers is clearly insane
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| 84 | # handled cases:
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| 85 | # $ORIGIN .
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| 86 | # $ORIGIN [zonedomain].
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| 87 | # $ORIGIN [subdomain.zonedomain].
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| 88 | if ($mdetail eq '.' || $mdetail =~ /$zname\.$/ || $zname =~ /$mdetail\.$/) {
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| 89 | $recbase = $mdetail;
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| 90 | } else {
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| 91 | # if we continue, we either use an $ORIGIN that's out of zone, or ignore it and potentially publish incorrect records.
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| 92 | die "bad \$ORIGIN: $_\n";
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| 93 | }
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| 94 | }
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| 95 | # not handling $INCLUDE or $GENERATE (altho the latter seems to be mostly a less-flexible version of the template types)
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| 96 | next;
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| 97 | }
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| 98 | # skip stale records that have no value
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| 99 | next if /^ip-192-168-1(12|20)-\d+/;
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| 100 | next if /ip.add.re.\d+\s*$/;
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| 101 | # records must begin in the first column, no leading whitespace
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| 102 | my ($name) = /^([\w\@_.-]+)\s/;
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| 103 | # append zone name to record name if missing AND not dot-terminated;
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| 104 | # this happens automagically for forward zones, but not reverse because Reasons. (fixme?)
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| 105 | # suck up and deal with the error if the dot-termiated name is out of zone; should be
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| 106 | # impossible with valid BIND zone file but...
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| 107 | $name .= ".$zname" if $name !~ /$zname$/ && $zname !~ /\.$/;
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| 108 | $name = $zname if /^\s*IN/;
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| 109 | $name = $zname if /^\@/;
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| 110 | s/^([\w\@_.-]+)\s+//;
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| 111 | # by convention the optional TTL leads the optional class, but they're apparently swappable.
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| 112 | my ($ttl) = /^(\d+)?\s/;
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| 113 | if (defined $ttl) {
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| 114 | # TTL may be zero
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| 115 | s/(\d+)?\s+//;
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| 116 | } else {
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| 117 | # Fall back to zone default TTL
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| 118 | $ttl = $zonettl;
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| 119 | }
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| 120 | my ($class) = /^(IN|CS|CH|HS|\d+)\s/;
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| 121 | if (defined $class) {
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| 122 | if ($class =~ /\d+/) {
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| 123 |
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| 124 | }
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| 125 | if ($class ne 'IN') {
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| 126 | print "Non-Internet class records not supported, you weirdo\n";
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| 127 | next;
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| 128 | }
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| 129 | s/(IN|CS|CH|HS)\s+//;
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| 130 | } else {
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| 131 | $class = 'IN';
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| 132 | }
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| 133 | my ($type) = /([A-Z-]+)\s/;
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| 134 | if (!$reverse_typemap{$type}) {
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| 135 | print "Unknown type $type, skipping\n ($_)\n";
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| 136 | next;
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| 137 | }
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| 138 | my $itype = $reverse_typemap{$type};
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| 139 | s/([A-Z-]+)\s+//;
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| 140 | chomp;
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| 141 | my $rdata = $_;
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| 142 |
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| 143 | # SOA is the only type that may span multiple lines. Probably. Note even AXFRed zones write multiline SOA records:
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| 144 | #@ IN SOA test.example.invalid. test.example.invalid. (2020082500 7200 900 604800 3600)
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| 145 | # IN NS olddns.example.com.
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| 146 | # IN MX 1 fred.foo.bar.invalid.
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| 147 | #foo IN A 192.168.16.45
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| 148 | # AXFR'ed zone file gets written as
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| 149 | #$ORIGIN .
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| 150 | #$TTL 3600 ; 1 hour
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| 151 | #example.invalid IN SOA test.example.invalid. test.example.invalid. (
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| 152 | # 2020082500 ; serial
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| 153 | # 7200 ; refresh (2 hours)
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| 154 | # 900 ; retry (15 minutes)
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| 155 | # 604800 ; expire (1 week)
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| 156 | # 3600 ; minimum (1 hour)
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| 157 | # )
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| 158 | # NS olddns.example.com.
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| 159 | # MX 1 fred.foo.bar.invalid.
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| 160 | #$ORIGIN example.invalid.
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| 161 | #foo A 192.168.16.45
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| 162 |
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| 163 | if ($type eq 'SOA') {
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| 164 |
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| 165 | }
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| 166 |
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| 167 | # Quotes may arguably be syntactically required, but they're not actually part of the record data
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| 168 | if ($itype == 16) {
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| 169 | $rdata =~ s/^"//;
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| 170 | $rdata =~ s/"$//;
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| 171 | }
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| 172 |
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| 173 | # temp hack for hosts file
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| 174 | if ($type eq 'A') {
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| 175 | # if ($amap{$name}) {
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| 176 | # print "urp: dupe name $name $rdata\n";
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| 177 | # } else {
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| 178 | push @{$amap{$name}}, $rdata;
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| 179 | # }
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| 180 | push @{$namemap{$rdata}}, $name;
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| 181 | }
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| 182 | if ($type eq 'CNAME') {
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| 183 | push @{$cmap{$rdata}}, $name;
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| 184 | }
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| 185 |
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| 186 | no warnings qw(uninitialized);
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| 187 | #print "parsed: '$name' '$class' '$ttl' '$type'->'$itype' '$rdata'\n";
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| 188 | #print;
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| 189 | #;imap IN 900 CNAME deepnet.cx.
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| 190 | ##fixme: not sure how to handle the case where someone leaves off the class.
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| 191 | if ($doimport) {
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| 192 | my ($code, $msg);
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| 193 | if ($rev eq 'n') {
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| 194 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$name, \$itype, \$rdata, $ttl);
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| 195 | } else {
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| 196 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$rdata, \$itype, \$name, $ttl);
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| 197 | }
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| 198 | print "$code: $msg\n";
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| 199 | }
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| 200 | }
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| 201 |
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| 202 |
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| 203 | #print Dumper \%amap;
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| 204 | #print Dumper \%namemap;
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| 205 | #print Dumper \%cmap;
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| 206 |
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| 207 | foreach my $n (keys %amap) {
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| 208 | foreach my $ip (@{$amap{$n}}) {
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| 209 | #print "$ip $n\n";
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| 210 | push @{$namemap{$ip}}, $n unless grep $n, @{$namemap{$ip}};
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| 211 | }
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| 212 | }
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| 213 |
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| 214 | foreach my $c (keys %cmap) {
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| 215 | if ($amap{$c}) {
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| 216 | print Dumper(\@{$amap{$c}});
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| 217 | }
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| 218 | # print $amap{$c};
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| 219 | }
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| 220 |
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| 221 | # cname targ -> IP
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| 222 |
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| 223 | #foreach my $ip (sort keys %namemap) {
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| 224 | # print "$ip ".join(' ', @{$namemap{$ip}})."\n";
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| 225 | #}
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| 226 |
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