| 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 $zname = shift @ARGV;
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| 33 | die "usage: bind-import zonename\n" if !$zname;
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| 34 | my $rev = 'n';
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| 35 | my $zid;
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| 36 |
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| 37 | my %amap;
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| 38 | my %namemap;
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| 39 | my %cmap;
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| 40 |
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| 41 | if ($zname =~ /\.arpa\.?$/ || $zname =~ m,^[\d./]+$,) {
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| 42 | $rev = 'y';
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| 43 | $zname = _zone2cidr($zname) if $zname =~ /\.arpa\.?$/;
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| 44 | $zid = $dnsdb->revID($zname,':ANY:');
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| 45 | if ($zid) {
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| 46 | $zname = new NetAddr::IP $zname;
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| 47 | $zname = DNSDB::_ZONE($zname, 'ZONE', 'r', '.').($zname->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 48 | }
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| 49 | } else {
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| 50 | $zid = $dnsdb->domainID($zname,':ANY:');
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| 51 | }
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| 52 |
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| 53 | die "zone $zname not on file\n" if !$zid;
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| 54 |
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| 55 | # still no sane way to expose a human-friendly view tag on the command line.
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| 56 | my $view = shift @ARGV;
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| 57 | $view = '' if !$view;
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| 58 |
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| 59 | ##fixme: retrieve defttl from SOA record
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| 60 | my $zonettl = 900;
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| 61 | my $defttl = $zonettl;
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| 62 | my $recbase = $zname; # to append to unqualified names
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| 63 |
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| 64 | # need to spin up a full state machine-ish thing, because BIND zone files are all about context
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| 65 | # see ch4, p56-72 in the grasshopper book
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| 66 | my $prevlabel = '';
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| 67 | my $curlabel = '';
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| 68 |
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| 69 | my $i = 0;
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| 70 |
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| 71 | while (<>) {
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| 72 | chomp;
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| 73 | next if /^\s*$/;
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| 74 | next if /^\s*;/; # comments
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| 75 | next if /^\s*\(/; # SOA closing. arguably should do some more targeted voodoo when parsing the SOA details
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| 76 |
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| 77 | if (my ($macro,$mdetail) = (/^\s*\$(TTL|ORIGIN|INCLUDE|GENERATE)\s+(.+)/) ) {
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| 78 | # macro sort of thing; $TTL and $ORIGIN most common. $INCLUDE is a thing, expect it to be rare in live use tho
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| 79 | if ($macro eq 'TTL') {
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| 80 | if ($mdetail =~ /^\d+$/) {
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| 81 | $defttl = $mdetail;
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| 82 | } else {
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| 83 | warn "invalid \$TTL: $_\n";
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| 84 | }
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| 85 | } elsif ($macro eq 'ORIGIN') {
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| 86 | ##fixme: going to skip the stupid case of "$ORIGIN com." and the like that lie
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| 87 | # between . and the root domain we were told we're importing; anyone using such
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| 88 | # a mess outside the root servers is clearly insane
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| 89 | # handled cases:
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| 90 | # $ORIGIN .
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| 91 | # $ORIGIN [zonedomain].
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| 92 | # $ORIGIN [subdomain.zonedomain].
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| 93 | if ($mdetail eq '.' || $mdetail =~ /$zname\.$/ || $zname =~ /$mdetail\.$/) {
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| 94 | $recbase = $mdetail;
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| 95 | } else {
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| 96 | # 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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| 97 | die "bad \$ORIGIN: $_\n";
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| 98 | }
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| 99 | }
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| 100 | # not handling $INCLUDE or $GENERATE (altho the latter seems to be mostly a less-flexible version of the template types)
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| 101 | next;
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| 102 | }
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| 103 | my $origrec = $_;
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| 104 | # skip stale records that have no value
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| 105 | next if /^ip-192-168-1(12|20)-\d+/;
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| 106 | next if /ip.add.re.\d+\s*$/;
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| 107 | # records must begin in the first column, no leading whitespace
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| 108 | my ($name) = /^([\w\@_.-]+)\s/;
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| 109 |
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| 110 | # foo IN A 1.2.3.4
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| 111 | # IN A 2.3.4.5
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| 112 | # =
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| 113 | # foo.zone. IN A 1.2.3.4
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| 114 | # foo.zone. IN A 2.3.4.5
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| 115 |
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| 116 | # "empty" label records inherit the previous label
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| 117 | # RRs start in the first column by definition, so leading whitespace indicates an inherited label
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| 118 | if (/^\s+/) {
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| 119 | # fatal error. if there is no previous label, we can by definition not set
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| 120 | # the current label based on it. this can only happen on the very first
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| 121 | # record, following records will *ALWAYS* have a previous label
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| 122 | die "bad first record ($_): no previous label\n" if !$prevlabel;
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| 123 | $name = $prevlabel;
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| 124 | }
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| 125 |
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| 126 | print "$i ($_)\n\t$name";
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| 127 |
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| 128 | # magic name!
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| 129 | $name = $zname if $name eq '@';
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| 130 |
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| 131 |
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| 132 |
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| 133 | # append zone name to record name if missing AND not dot-terminated;
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| 134 | # this happens automagically for forward zones, but not reverse because Reasons. (fixme?)
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| 135 | # suck up and deal with the error if the dot-termiated name is out of zone; should be
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| 136 | # impossible with valid BIND zone file but...
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| 137 | if ($name !~ /\.$/) {
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| 138 | $name .= ".$zname" if $name !~ /$zname$/;
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| 139 | } else {
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| 140 | warn "skipping out-of-zone record:\n\t($_)\n" if $name !~ /$zname\.$/;
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| 141 | next;
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| 142 | }
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| 143 |
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| 144 |
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| 145 | last if $i > 5;
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| 146 |
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| 147 | s/^([\w\@_.-]+)\s+//;
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| 148 |
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| 149 | ##fixme: drop curlabel? not sure it's needed
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| 150 | $curlabel = $name;
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| 151 | $prevlabel = $curlabel;
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| 152 | ##todo: BIND conflates a repeated label with repeating the TTL too. Matter of opinion whether that's really correct or not.
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| 153 |
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| 154 |
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| 155 | # by convention the optional TTL leads the optional class, but they're apparently swappable.
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| 156 | my ($ttl) = /^(\d+)?\s/;
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| 157 | if (defined $ttl) {
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| 158 | # TTL may be zero
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| 159 | s/(\d+)?\s+//;
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| 160 | } else {
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| 161 | # Fall back to zone default TTL
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| 162 | $ttl = $zonettl;
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| 163 | }
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| 164 | my ($class) = /^(IN|CS|CH|HS|\d+)\s/;
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| 165 | if (defined $class) {
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| 166 | if ($class =~ /\d+/) {
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| 167 |
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| 168 | }
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| 169 | if ($class ne 'IN') {
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| 170 | warn "Non-Internet class ($class) records not supported:\n\t$origrec\n";
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| 171 | next;
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| 172 | }
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| 173 | s/(IN|CS|CH|HS)\s+//;
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| 174 | } else {
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| 175 | $class = 'IN';
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| 176 | }
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| 177 | my ($type) = /([A-Z-]+)\s/;
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| 178 | if (!$reverse_typemap{$type}) {
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| 179 | warn "Unknown type $type, skipping\n\t($_)\n";
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| 180 | next;
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| 181 | }
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| 182 | my $itype = $reverse_typemap{$type};
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| 183 | s/([A-Z-]+)\s+//;
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| 184 | chomp;
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| 185 | my $rdata = $_;
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| 186 |
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| 187 | # SOA is the only type that may span multiple lines. Probably. Note even AXFRed zones write multiline SOA records:
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| 188 | #@ IN SOA test.example.invalid. test.example.invalid. (2020082500 7200 900 604800 3600)
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| 189 | # IN NS olddns.example.com.
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| 190 | # IN MX 1 fred.foo.bar.invalid.
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| 191 | #foo IN A 192.168.16.45
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| 192 | # AXFR'ed zone file gets written as
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| 193 | #$ORIGIN .
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| 194 | #$TTL 3600 ; 1 hour
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| 195 | #example.invalid IN SOA test.example.invalid. test.example.invalid. (
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| 196 | # 2020082500 ; serial
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| 197 | # 7200 ; refresh (2 hours)
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| 198 | # 900 ; retry (15 minutes)
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| 199 | # 604800 ; expire (1 week)
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| 200 | # 3600 ; minimum (1 hour)
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| 201 | # )
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| 202 | # NS olddns.example.com.
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| 203 | # MX 1 fred.foo.bar.invalid.
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| 204 | #$ORIGIN example.invalid.
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| 205 | #foo A 192.168.16.45
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| 206 |
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| 207 | if ($type eq 'SOA') {
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| 208 | my ($ns, $adminmail) = ($rdata =~ /([\w.]+)\s+([\w.]+)\s+\(/);
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| 209 | die "Can't parse gibberish SOAish record: $_\n" if !$ns;
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| 210 | $rdata =~ s/([\w.]+)\s+([\w.]+)\s+\(\s*//;
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| 211 |
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| 212 | # There are probably more efficient ways to do this but the SOA record
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| 213 | # format is essentially character based, not line-based.
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| 214 | # In theory the SOA serial etc may be spread over up to 5 lines, in any combination.
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| 215 |
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| 216 | # Parse fields from $rdata if present
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| 217 | my @soabits;
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| 218 | my @soafirst = split /\s+/, $rdata;
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| 219 | while (my $f = shift @soafirst) {
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| 220 | last if $f !~ /^\d/;
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| 221 | push @soabits, $f;
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| 222 | }
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| 223 |
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| 224 | # Read more lines if we don't have enough SOA fields filled
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| 225 | while (scalar(@soabits) < 5) {
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| 226 | my $tmp = <>;
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| 227 | $tmp =~ s/^\s*//;
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| 228 | my @tmpsoa = split /\s+/, $tmp;
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| 229 | while (my $f = shift @tmpsoa) {
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| 230 | last if $f !~ /^\d/;
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| 231 | push @soabits, $f;
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| 232 | }
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| 233 | if (scalar(@soabits) == 5) {
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| 234 | last;
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| 235 | }
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| 236 | }
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| 237 | } # SOA
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| 238 |
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| 239 | # Quotes may arguably be syntactically required, but they're not actually part of the record data
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| 240 | elsif ($type eq 'TXT') {
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| 241 | $rdata =~ s/^"//;
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| 242 | $rdata =~ s/"$//;
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| 243 | }
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| 244 |
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| 245 | # temp hack for hosts file
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| 246 | elsif ($type eq 'A') {
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| 247 | # if ($amap{$name}) {
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| 248 | # print "urp: dupe name $name $rdata\n";
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| 249 | # } else {
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| 250 | push @{$amap{$name}}, $rdata;
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| 251 | # }
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| 252 | push @{$namemap{$rdata}}, $name;
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| 253 | }
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| 254 | elsif ($type eq 'CNAME') {
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| 255 | push @{$cmap{$rdata}}, $name;
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| 256 | }
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| 257 |
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| 258 | no warnings qw(uninitialized);
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| 259 | #print "parsed: '$name' '$class' '$ttl' '$type'->'$itype' '$rdata'\n";
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| 260 | #print;
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| 261 | #;imap IN 900 CNAME deepnet.cx.
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| 262 | ##fixme: not sure how to handle the case where someone leaves off the class.
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| 263 | if ($doimport) {
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| 264 | my ($code, $msg);
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| 265 | if ($rev eq 'n') {
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| 266 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$name, \$itype, \$rdata, $ttl);
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| 267 | } else {
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| 268 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$rdata, \$itype, \$name, $ttl);
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| 269 | }
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| 270 | print "$code: $msg\n";
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| 271 | }
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| 272 | $i++;
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| 273 | }
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| 274 |
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| 275 |
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| 276 | #print Dumper \%amap;
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| 277 | #print Dumper \%namemap;
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| 278 | #print Dumper \%cmap;
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| 279 |
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| 280 | foreach my $n (keys %amap) {
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| 281 | foreach my $ip (@{$amap{$n}}) {
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| 282 | #print "$ip $n\n";
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| 283 | push @{$namemap{$ip}}, $n unless grep $n, @{$namemap{$ip}};
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| 284 | }
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| 285 | }
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| 286 |
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| 287 | foreach my $c (keys %cmap) {
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| 288 | if ($amap{$c}) {
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| 289 | print Dumper(\@{$amap{$c}});
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| 290 | }
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| 291 | # print $amap{$c};
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| 292 | }
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| 293 |
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| 294 | # cname targ -> IP
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| 295 |
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| 296 | #foreach my $ip (sort keys %namemap) {
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| 297 | # print "$ip ".join(' ', @{$namemap{$ip}})."\n";
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| 298 | #}
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| 299 |
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