| 1 | #!/usr/bin/perl
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| 2 | # Convert a BIND zone file to a hosts 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 | # push "the directory the script is in" into @INC
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| 25 | use FindBin;
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| 26 | use lib "$FindBin::RealBin/";
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| 27 |
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| 28 | use DNSDB;
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| 29 |
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| 30 | my $dnsdb = new DNSDB;
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| 31 | my $doimport = 0;
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| 32 |
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| 33 | #print Dumper(\%reverse_typemap);
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| 34 |
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| 35 | my $zname = shift @ARGV;
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| 36 | my $rev = 'n';
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| 37 | my $zid;
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| 38 |
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| 39 | my %amap;
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| 40 | my %namemap;
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| 41 | my %cmap;
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| 42 |
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| 43 | # this bit irrelevant for a hosts file
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| 44 | #if ($zname =~ /\.arpa\.?$/ || $zname =~ m,^[\d./]+$,) {
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| 45 | # $rev = 'y';
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| 46 | # $zname = _zone2cidr($zname) if $zname =~ /\.arpa\.?$/;
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| 47 | # $zid = $dnsdb->revID($zname,':ANY:');
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| 48 | # if ($zid) {
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| 49 | # $zname = new NetAddr::IP $zname;
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| 50 | # $zname = DNSDB::_ZONE($zname, 'ZONE', 'r', '.').($zname->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 51 | # }
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| 52 | #} else {
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| 53 | # $zid = $dnsdb->domainID($zname,':ANY:');
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| 54 | #}
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| 55 | #
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| 56 | #die "zone $zname not on file\n" if !$zid;
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| 57 |
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| 58 | # still no sane way to expose a human-friendly view tag on the command line.
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| 59 | my $view = shift @ARGV;
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| 60 | $view = '' if !$view;
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| 61 |
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| 62 | ##fixme: retrieve defttl from SOA record
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| 63 | #my $zonettl = 900;
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| 64 | #my $defttl = $zonettl;
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| 65 | # need an ultimate fallback for this one
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| 66 | my $defttl = 900;
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| 67 | my $origin = "$zname."; # to append to unqualified names
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| 68 | my $curlabel;
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| 69 | my $prevlabel;
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| 70 |
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| 71 | my $i = 0;
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| 72 |
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| 73 | # need to spin up a full state machine-ish thing, because BIND zone files are all about context
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| 74 | while (my $rec = <>) {
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| 75 | chomp $rec;
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| 76 | next if $rec =~ /^\s*$/;
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| 77 | next if $rec =~ /^\s*;/;
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| 78 | next if $rec =~ /^\s*\)/; # SOA closing (possibly other records too?)
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| 79 | # arguably should do some more targeted voodoo when parsing the SOA details
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| 80 | #print "$i: ($rec)\n";
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| 81 | #last if ++$i > 5;
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| 82 |
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| 83 | if (my ($macro,$mdetail) = ($rec =~ /^\s*\$(TTL|ORIGIN|INCLUDE)\s+(.+)/) ) {
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| 84 | # macro sort of thing; $TTL and $ORIGIN most common. $INCLUDE is a thing, expect it to be rare in live use tho
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| 85 | if ($macro eq 'TTL') {
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| 86 | # irrelevant for a hosts file
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| 87 | } elsif ($macro eq 'ORIGIN') {
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| 88 | #print "origin ($mdetail)\n";
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| 89 | # $ORIGIN supports cascading/nesting, by watching for fully-qualified names vs partial names.
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| 90 | if ($mdetail =~ /\.$/) {
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| 91 | $origin = $mdetail;
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| 92 | } else {
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| 93 | # append current origin to unqualified origin
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| 94 | $origin = "$mdetail.$origin";
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| 95 | }
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| 96 | }
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| 97 | ##fixme: should arguably handle $INCLUDE
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| 98 | # probably NOT going to handle $GENERATE, since that type of record set is best handled in DNS
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| 99 | next;
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| 100 | }
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| 101 |
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| 102 | my $origrec = $rec;
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| 103 |
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| 104 | ##fixme: convert to optional skipfile?
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| 105 | # skip stale records that have no value
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| 106 | #next if /^ip-\d+-\d+-\d+/;
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| 107 | #next if /^ip.pre.fix.\d+.static.colo/;
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| 108 |
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| 109 | # leading whitespace indicates "same label as last record"
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| 110 | if ($rec =~ /^\s/) {
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| 111 | $curlabel = $prevlabel;
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| 112 | } else {
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| 113 | ($curlabel) = ($rec =~ /^([\w\@_.-]+)\s/);
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| 114 | }
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| 115 |
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| 116 | # magic name!
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| 117 | $curlabel = "$zname." if $curlabel eq '@';
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| 118 |
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| 119 | # append $ORIGIN if name is not fully qualified.
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| 120 | if ($curlabel !~ /\.$/) {
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| 121 | $curlabel .= ".$origin";
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| 122 | }
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| 123 |
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| 124 | # check for zone scope. skip bad records.
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| 125 | if ($curlabel !~ /$zname.$/) {
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| 126 | warn "bad record $origrec, maybe bad \$ORIGIN?\n";
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| 127 | next;
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| 128 | }
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| 129 |
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| 130 | # trim the label, if any
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| 131 | $rec =~ s/^([\w\@_.-]*)\s+//;
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| 132 |
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| 133 | #print "r$i ($rec)\n\t$curlabel\n";
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| 134 |
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| 135 | my $nc = 0;
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| 136 | my $debugid = -1;
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| 137 | my %seenatoms;
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| 138 | # we don't actually use these but we have to recognize them
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| 139 | my $class = 'IN';
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| 140 | # not preset as we need to detect whether it's present in the record
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| 141 | my $ttl;
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| 142 | #my $ttl = $defttl;
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| 143 | my $type;
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| 144 | my $badrec;
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| 145 | my $curatom = 'class';
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| 146 | ##fixme: maybe wrap this in an eval() instead of the warn/badrec/last bits?
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| 147 | for (; $nc < 3; $nc++) {
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| 148 | my ($atom) = ($rec =~ /^([\w\d]+)\s/);
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| 149 | # should be safe?
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| 150 | last if !$atom;
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| 151 | #print "a$nc: l: $rec\n $atom\n" if $i == $debugid;
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| 152 | if ($atom =~ /^\d+$/) {
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| 153 | #print "a$nc: d: atom [$atom]\n $rec\n" if $i == $debugid;
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| 154 | if (defined($ttl)) {
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| 155 | warn "bad record ($origrec)\n";
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| 156 | $badrec = 1;
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| 157 | last;
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| 158 | } else {
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| 159 | if ($curatom ne 'class' && $curatom ne 'ttl') {
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| 160 | warn "bad record ($origrec)\n";
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| 161 | $badrec = 1;
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| 162 | last;
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| 163 | }
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| 164 | $curatom = 'ttl';
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| 165 | $ttl = $atom;
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| 166 | }
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| 167 | }
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| 168 | elsif ($atom =~ /^IN|CS|CH|HS$/) {
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| 169 | #print "a$nc: d2: atom [$atom]\n $rec\n" if $i == $debugid;
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| 170 | if ($atom =~ /CS|CH|HS/) {
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| 171 | warn "unsupported class $atom in record ($origrec)\n";
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| 172 | $badrec = 1;
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| 173 | last;
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| 174 | }
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| 175 | $curatom = 'class';
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| 176 | $class = $atom;
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| 177 | }
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| 178 | elsif ($atom =~ /^[A-Z]+/) {
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| 179 | #print "a$nc: d3a: probable type [$atom]\n" if $i == $debugid;
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| 180 | if ($reverse_typemap{$atom}) {
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| 181 | #print "a$nc: d3b: atom [$atom]\n $rec\n" if $i == $debugid;
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| 182 | $type = $atom;
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| 183 | } else {
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| 184 | warn "unknown type $atom in record ($origrec)\n";
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| 185 | $badrec = 1;
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| 186 | last;
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| 187 | }
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| 188 | }
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| 189 | $rec =~ s/^$atom\s*//;
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| 190 | #print "a$nc: next: $rec\n" if $i == $debugid;
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| 191 | } # class/type/TTL loop
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| 192 |
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| 193 | #last if $i > 15;
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| 194 | next if $badrec;
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| 195 |
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| 196 | #print Dumper(\%reverse_typemap);
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| 197 | $ttl = $defttl if !defined($ttl);
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| 198 |
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| 199 | #print "class $class, ttl $ttl, type $type\n";
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| 200 | #last;
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| 201 |
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| 202 | my $itype = $reverse_typemap{$type};
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| 203 | # s/([A-Z-]+)\s+//;
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| 204 | # chomp;
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| 205 | my $rdata = $rec;
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| 206 |
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| 207 | $prevlabel = $curlabel;
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| 208 |
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| 209 | ##fixme: squish this down for this script since SOA records are irrelevant
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| 210 | if ($type eq 'SOA') {
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| 211 | my ($ns, $adminmail) = ($rdata =~ /([\w.]+)\s+([\w.]+)\s+\(/);
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| 212 | die "Can't parse gibberish SOAish record: $_\n" if !$ns;
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| 213 | $rdata =~ s/([\w.]+)\s+([\w.]+)\s+\(\s*//;
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| 214 |
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| 215 | # There are probably more efficient ways to do this but the SOA record
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| 216 | # format is essentially character based, not line-based.
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| 217 | # In theory the SOA serial etc may be spread over up to 5 lines, in any combination.
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| 218 |
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| 219 | # Parse fields from $rdata if present
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| 220 | my @soabits;
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| 221 | my @soafirst = split /\s+/, $rdata;
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| 222 | while (my $f = shift @soafirst) {
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| 223 | last if $f !~ /^\d/;
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| 224 | push @soabits, $f;
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| 225 | }
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| 226 |
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| 227 | # Read more lines if we don't have enough SOA fields filled
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| 228 | while (scalar(@soabits) < 5) {
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| 229 | my $tmp = <>;
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| 230 | $tmp =~ s/^\s*//;
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| 231 | my @tmpsoa = split /\s+/, $tmp;
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| 232 | while (my $f = shift @tmpsoa) {
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| 233 | last if $f !~ /^\d/;
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| 234 | push @soabits, $f;
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| 235 | }
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| 236 | if (scalar(@soabits) == 5) {
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| 237 | last;
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| 238 | }
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| 239 | }
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| 240 | } # SOA
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| 241 |
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| 242 | ##fixme: trim dupes if possible
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| 243 | elsif ($type eq 'A') {
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| 244 | # push @{$amap{$curlabel}}, $rdata;
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| 245 | # push @{$namemap{$rdata}}, $curlabel;
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| 246 |
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| 247 | # need the name->IP map so we can reverse-map the CNAMEs on output
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| 248 | $amap{$curlabel}{$rdata}++;
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| 249 | $namemap{$rdata}{$curlabel}++;
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| 250 |
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| 251 | #print "$origrec\n";
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| 252 | } # A record
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| 253 |
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| 254 | elsif ($type eq 'CNAME') {
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| 255 | # push @{$cmap{$rdata}}, $curlabel;
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| 256 | ##todo: expand $rdata with $origin if unqualified
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| 257 | $cmap{$curlabel} = $rdata;
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| 258 | #print "$origrec\n";
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| 259 | } # CNAME record
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| 260 |
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| 261 |
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| 262 | # last if ++$i > 10;
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| 263 | } # <STDIN>
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| 264 |
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| 265 |
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| 266 | #print Dumper \%amap;
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| 267 | #foreach my $n (keys %amap) {
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| 268 | # foreach my $ip (@{$amap{$n}}) {
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| 269 | ##print "$ip\t$n\n";
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| 270 | # push @{$namemap{$ip}}, $n unless grep $n, @{$namemap{$ip}};
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| 271 | # }
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| 272 | #}
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| 273 |
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| 274 | #print Dumper \%namemap;
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| 275 | #foreach my $ip (sort keys %namemap) {
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| 276 | # print "$ip\t".join(' ', @{$namemap{$ip}})."\n";
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| 277 | #}
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| 278 |
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| 279 | #print Dumper \%cmap;
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| 280 |
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| 281 |
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| 282 | foreach my $cn (keys %cmap) {
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| 283 | print "$cn -> $cmap{$cn}\n";
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| 284 | # warn "CNAME $cn out of zone\n" if !$namemap{$cn};
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| 285 | }
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