| 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 | local $dnsdb->{dbh}->{AutoCommit} = 0;
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| 33 | local $dnsdb->{dbh}->{RaiseError} = 1;
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| 34 |
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| 35 | ##fixme: command arguments/flags to set these to alternate values
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| 36 | my $group = 1;
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| 37 | my $status = 1;
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| 38 | my $location = '';
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| 39 | # we'll update this with the actual serial number from the SOA record later
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| 40 | my $serial = time();
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| 41 |
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| 42 | my $zname = shift @ARGV;
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| 43 | my $origzone = $zname;
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| 44 | die "usage: bind-import zonename\n" if !$zname;
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| 45 | my $rev = 'n';
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| 46 | my $zid;
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| 47 |
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| 48 | my %amap;
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| 49 | my %namemap;
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| 50 | my %cmap;
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| 51 |
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| 52 | ##fixme: this is wrong, BIND zone files are generally complete and we're adding. merging records is an entire fridge full of worms.
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| 53 | ##fixme: for import, should arguably check for zone *non*existence
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| 54 | if ($zname =~ /\.arpa\.?$/ || $zname =~ m,^[\d./]+$,) {
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| 55 | $rev = 'y';
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| 56 | $zname = _zone2cidr($zname) if $zname =~ /\.arpa\.?$/;
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| 57 | $zid = $dnsdb->revID($zname,':ANY:');
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| 58 | if ($zid) {
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| 59 | die "zone $origzone already present, not merging records\n";
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| 60 | #$zname = new NetAddr::IP $zname;
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| 61 | # $zname = DNSDB::_ZONE($zname, 'ZONE', 'r', '.').($zname->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 62 | }
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| 63 | $zid = $dnsdb->{dbh}->do("INSERT INTO revzones (revnet,group_id,status,default_location,zserial) VALUES (?,?,?,?,?) RETURNING rnds_id",
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| 64 | undef, ($zname, $group, $status, $location, $serial));
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| 65 |
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| 66 | } else {
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| 67 | $zid = $dnsdb->domainID($zname,':ANY:');
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| 68 | if ($zid) {
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| 69 | die "zone $origzone already present, not merging records\n";
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| 70 | }
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| 71 | $zid = $dnsdb->{dbh}->do("INSERT INTO domains (domain,group_id,status,default_location,zserial) VALUES (?,?,?,?,?) RETURNING domain_id",
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| 72 | undef, ($zname, $group, $status, $location, $serial));
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| 73 | }
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| 74 |
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| 75 | die "error creating zone stub for $zname: ".$dnsdb->{dbh}->errstr if !$zid;
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| 76 |
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| 77 |
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| 78 |
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| 79 | # still no sane way to expose a human-friendly view tag on the command line.
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| 80 | my $view = shift @ARGV;
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| 81 | $view = '' if !$view;
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| 82 |
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| 83 | ##fixme: retrieve defttl from SOA record
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| 84 | my $zonettl = 900;
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| 85 | my $defttl = $zonettl;
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| 86 | my $origin = "$zname."; # to append to unqualified names
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| 87 |
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| 88 | # need to spin up a full state machine-ish thing, because BIND zone files are all about context
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| 89 | # see ch4, p56-72 in the grasshopper book
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| 90 | my $prevlabel = '';
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| 91 | my $curlabel = '';
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| 92 |
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| 93 | my $i = 0;
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| 94 |
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| 95 | while (my $rec = <>) {
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| 96 | chomp $rec;
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| 97 | next if $rec =~ /^\s*$/;
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| 98 | next if $rec =~ /^\s*;/; # comments
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| 99 | next if $rec =~ /^\s*\)/; # SOA closing (possibly other records too?)
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| 100 | # arguably should do some more targeted voodoo when parsing the SOA details
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| 101 |
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| 102 | # skip stale records that have no value
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| 103 | next if /^ip-192-168-1(12|20)-\d+/;
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| 104 | next if /ip.add.re.\d+\s*$/;
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| 105 |
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| 106 | #last if ++$i > 4;
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| 107 | print "($rec)\n";
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| 108 | if (my ($macro,$mdetail) = ($rec =~ /^\s*\$(TTL|ORIGIN|INCLUDE|GENERATE)\s+(.+)/) ) {
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| 109 | # macro sort of thing; $TTL and $ORIGIN most common. $INCLUDE is a thing, expect it to be rare in live use tho
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| 110 | if ($macro eq 'TTL') {
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| 111 | $mdetail =~ s/\s*;.+$//;
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| 112 | if ($mdetail =~ /^\d+$/) {
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| 113 | $defttl = $mdetail;
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| 114 | } else {
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| 115 | warn "invalid \$TTL: $rec\n";
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| 116 | }
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| 117 | } elsif ($macro eq 'ORIGIN') {
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| 118 | ##fixme: going to skip the stupid case of "$ORIGIN com." and the like that lie
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| 119 | # between . and the root domain we were told we're importing; anyone using such
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| 120 | # a mess outside the root servers is clearly insane
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| 121 |
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| 122 | # $ORIGIN supports cascading/nesting, by watching for fully-qualified names vs partial names.
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| 123 |
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| 124 | print "origin ($mdetail)\n";
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| 125 | if ($mdetail =~ /\.$/) {
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| 126 | $origin = $mdetail;
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| 127 | } else {
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| 128 | # append current origin to unqualified origin
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| 129 | $origin = "$mdetail.$origin";
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| 130 | }
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| 131 |
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| 132 | # if ($mdetail eq '.' || $mdetail =~ /$zname\.$/ || $zname =~ /$mdetail\.$/) {
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| 133 | # $origin = $mdetail;
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| 134 | # } else {
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| 135 | # # 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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| 136 | # die "bad \$ORIGIN: $_\n";
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| 137 | # }
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| 138 |
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| 139 | }
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| 140 | # not handling $INCLUDE or $GENERATE (altho the latter seems to be mostly a less-flexible version of the template types)
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| 141 | next;
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| 142 | }
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| 143 |
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| 144 | my $origrec = $rec;
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| 145 |
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| 146 | # leading whitespace indicates "same label as last record"
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| 147 | if ($rec =~ /^\s/) {
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| 148 | $curlabel = $prevlabel;
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| 149 | print " found empty label, using previous label\n";
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| 150 | } else {
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| 151 | ($curlabel) = ($rec =~ /^([\w\@_.-]+)\s/);
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| 152 | }
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| 153 |
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| 154 | print " found '$curlabel'\n";
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| 155 |
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| 156 | # magic name!
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| 157 | $curlabel = "$zname." if $curlabel eq '@';
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| 158 |
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| 159 | # append $ORIGIN if name is not fully qualified.
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| 160 | if ($curlabel !~ /\.$/) {
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| 161 | $curlabel .= ".$origin";
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| 162 | }
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| 163 | print " expanded '$curlabel'\n";
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| 164 |
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| 165 | # check for zone scope. skip bad records.
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| 166 | if ($curlabel !~ /$zname.$/) {
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| 167 | warn "bad record $origrec, maybe bad \$ORIGIN?\n";
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| 168 | last;
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| 169 | next;
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| 170 | }
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| 171 |
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| 172 | # trim the label, if any
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| 173 | $rec =~ s/^([\w\@_.-]*)\s+//;
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| 174 |
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| 175 | # # records must begin in the first column, no leading whitespace
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| 176 | # my ($name) = /^([\w\@_.-]+)\s/;
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| 177 |
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| 178 | # foo IN A 1.2.3.4
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| 179 | # IN A 2.3.4.5
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| 180 | # =
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| 181 | # foo.zone. IN A 1.2.3.4
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| 182 | # foo.zone. IN A 2.3.4.5
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| 183 |
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| 184 | # # "empty" label records inherit the previous label
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| 185 | # # RRs start in the first column by definition, so leading whitespace indicates an inherited label
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| 186 | # if (/^\s+/) {
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| 187 | # # fatal error. if there is no previous label, we can by definition not set
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| 188 | # # the current label based on it. this can only happen on the very first
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| 189 | # # record, following records will *ALWAYS* have a previous label
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| 190 | # die "bad first record ($_): no previous label\n" if !$prevlabel;
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| 191 | # $name = $prevlabel;
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| 192 | # }
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| 193 |
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| 194 | print "$i ($rec)\n";#\t$curlabel";
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| 195 |
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| 196 |
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| 197 |
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| 198 |
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| 199 | # # append zone name to record name if missing AND not dot-terminated;
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| 200 | # # this happens automagically for forward zones, but not reverse because Reasons. (fixme?)
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| 201 | # # suck up and deal with the error if the dot-termiated name is out of zone; should be
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| 202 | # # impossible with valid BIND zone file but...
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| 203 | # if ($name !~ /\.$/) {
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| 204 | # $name .= ".$zname" if $name !~ /$zname$/;
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| 205 | # } else {
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| 206 | # warn "skipping out-of-zone record:\n\t($_)\n" if $name !~ /$zname\.$/;
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| 207 | # next;
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| 208 | # }
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| 209 |
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| 210 |
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| 211 | my $nc = 0;
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| 212 | my $class = 'IN';
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| 213 | my $ttl;
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| 214 | my $type;
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| 215 | my $badrec;
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| 216 | my $curatom = 'class';
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| 217 |
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| 218 | eval {
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| 219 | for (; $nc < 3; $nc++) {
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| 220 | my ($atom) = ($rec =~ /^([\w\d.]+)\s/);
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| 221 | # should be safe?
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| 222 | last if !$atom;
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| 223 | last if $type;
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| 224 | #print "nc:$nc: $atom\n";
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| 225 | if ($atom =~ /^\d+$/) {
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| 226 | if (defined($ttl)) {
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| 227 | die "bad record ($origrec)\n";
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| 228 | # warn "bad record ($origrec)\n";
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| 229 | # $badrec = 1;
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| 230 | # last;
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| 231 | } else {
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| 232 | if ($curatom ne 'class' && $curatom ne 'ttl') {
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| 233 | die "bad record ($origrec)\n";
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| 234 | # warn "bad record ($origrec)\n";
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| 235 | # $badrec = 1;
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| 236 | # last;
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| 237 | }
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| 238 | $curatom = 'ttl';
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| 239 | $ttl = $atom;
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| 240 | }
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| 241 | }
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| 242 |
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| 243 | elsif ($atom =~ /^IN|CS|CH|HS$/) {
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| 244 | #print "a$nc: d2: atom [$atom]\n $rec\n" if $i == $debugid;
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| 245 | if ($atom =~ /CS|CH|HS/) {
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| 246 | die "unsupported class $atom in record ($origrec)\n";
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| 247 | # warn "unsupported class $atom in record ($origrec)\n";
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| 248 | # $badrec = 1;
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| 249 | # last;
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| 250 | }
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| 251 | $curatom = 'class';
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| 252 | $class = $atom;
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| 253 | }
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| 254 |
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| 255 | elsif ($atom =~ /^[A-Z]+/) {
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| 256 | # print "dbg: type $atom\n";
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| 257 | if ($reverse_typemap{$atom}) {
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| 258 | $type = $atom;
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| 259 | } else {
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| 260 | die "unknown type $atom in record ($origrec)\n";
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| 261 | }
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| 262 | }
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| 263 | $rec =~ s/^$atom\s*//;
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| 264 | }
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| 265 | };
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| 266 | if ($@) {
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| 267 | warn $@;
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| 268 | next;
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| 269 | }
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| 270 |
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| 271 | # set default TTL here so we can detect a TTL in the loop above
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| 272 | $ttl = $defttl if !defined($ttl);
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| 273 |
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| 274 | #next if $badrec;
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| 275 |
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| 276 |
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| 277 | ##fixme: drop curlabel? not sure it's needed
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| 278 | #$curlabel = $name;
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| 279 | $prevlabel = $curlabel;
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| 280 | ##todo: BIND conflates a repeated label with repeating the TTL too. Matter of opinion whether that's really correct or not.
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| 281 |
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| 282 |
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| 283 |
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| 284 | ## by convention the optional TTL leads the optional class, but they're apparently swappable.
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| 285 | # my ($ttl) = /^(\d+)?\s/;
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| 286 | # if (defined $ttl) {
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| 287 | # # TTL may be zero
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| 288 | # s/(\d+)?\s+//;
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| 289 | # } else {
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| 290 | # # Fall back to zone default TTL
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| 291 | # $ttl = $zonettl;
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| 292 | # }
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| 293 | # my ($class) = /^(IN|CS|CH|HS|\d+)\s/;
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| 294 | # if (defined $class) {
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| 295 | # if ($class =~ /\d+/) {
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| 296 | #
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| 297 | # }
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| 298 | # if ($class ne 'IN') {
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| 299 | # warn "Non-Internet class ($class) records not supported:\n\t$origrec\n";
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| 300 | # next;
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| 301 | # }
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| 302 | # s/(IN|CS|CH|HS)\s+//;
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| 303 | # } else {
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| 304 | # $class = 'IN';
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| 305 | # }
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| 306 | # my ($type) = /([A-Z-]+)\s/;
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| 307 | # if (!$reverse_typemap{$type}) {
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| 308 | # warn "Unknown type $type, skipping\n\t($rec)\n";
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| 309 | # next;
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| 310 | # }
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| 311 | # s/([A-Z-]+)\s+//;
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| 312 | # chomp;
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| 313 |
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| 314 |
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| 315 | my $itype = $reverse_typemap{$type};
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| 316 | my $rdata = $rec;
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| 317 |
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| 318 | # SOA is the only type that may span multiple lines. Probably. Note even AXFRed zones write multiline SOA records:
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| 319 | #@ IN SOA test.example.invalid. test.example.invalid. (2020082500 7200 900 604800 3600)
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| 320 | # IN NS olddns.example.com.
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| 321 | # IN MX 1 fred.foo.bar.invalid.
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| 322 | #foo IN A 192.168.16.45
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| 323 | # AXFR'ed zone file gets written as
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| 324 | #$ORIGIN .
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| 325 | #$TTL 3600 ; 1 hour
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| 326 | #example.invalid IN SOA test.example.invalid. test.example.invalid. (
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| 327 | # 2020082500 ; serial
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| 328 | # 7200 ; refresh (2 hours)
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| 329 | # 900 ; retry (15 minutes)
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| 330 | # 604800 ; expire (1 week)
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| 331 | # 3600 ; minimum (1 hour)
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| 332 | # )
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| 333 | # NS olddns.example.com.
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| 334 | # MX 1 fred.foo.bar.invalid.
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| 335 | #$ORIGIN example.invalid.
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| 336 | #foo A 192.168.16.45
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| 337 |
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| 338 | if ($type eq 'SOA') {
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| 339 | my ($ns, $adminmail) = ($rdata =~ /([\w.]+)\s+([\w.]+)\s+\(/);
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| 340 | die "Can't parse gibberish SOAish record: $rec\n" if !$ns;
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| 341 | $rdata =~ s/([\w.]+)\s+([\w.]+)\s+\(\s*//;
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| 342 |
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| 343 | # There are probably more efficient ways to do this but the SOA record
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| 344 | # format is essentially character based, not line-based.
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| 345 | # In theory the SOA serial etc may be spread over up to 5 lines, in any combination.
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| 346 |
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| 347 | # Parse fields from $rdata if present
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| 348 | my @soabits;
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| 349 | my @soafirst = split /\s+/, $rdata;
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| 350 | while (my $f = shift @soafirst) {
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| 351 | last if $f !~ /^\d/;
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| 352 | push @soabits, $f;
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| 353 | }
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| 354 |
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| 355 | # Read more lines if we don't have enough SOA fields filled
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| 356 | while (scalar(@soabits) < 5) {
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| 357 | my $tmp = <>;
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| 358 | $tmp =~ s/^\s*//;
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| 359 | my @tmpsoa = split /\s+/, $tmp;
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| 360 | while (my $f = shift @tmpsoa) {
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| 361 | last if $f !~ /^\d/;
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| 362 | push @soabits, $f;
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| 363 | }
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| 364 | if (scalar(@soabits) == 5) {
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| 365 | last;
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| 366 | }
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| 367 | }
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| 368 | } # SOA
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| 369 |
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| 370 | # Quotes may arguably be syntactically required, but they're not actually part of the record data
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| 371 | elsif ($type eq 'TXT') {
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| 372 | $rdata =~ s/^"//;
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| 373 | $rdata =~ s/"$//;
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| 374 | }
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| 375 |
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| 376 | # temp hack for hosts file
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| 377 | elsif ($type eq 'A') {
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| 378 | # if ($amap{$name}) {
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| 379 | # print "urp: dupe name $name $rdata\n";
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| 380 | # } else {
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| 381 | push @{$amap{$curlabel}}, $rdata;
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| 382 | # }
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| 383 | push @{$namemap{$rdata}}, $curlabel;
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| 384 | }
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| 385 | elsif ($type eq 'CNAME') {
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| 386 | push @{$cmap{$rdata}}, $curlabel;
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| 387 | }
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| 388 |
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| 389 | no warnings qw(uninitialized);
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| 390 | #print "parsed: '$name' '$class' '$ttl' '$type'->'$itype' '$rdata'\n";
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| 391 | #print;
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| 392 | #;imap IN 900 CNAME deepnet.cx.
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| 393 | ##fixme: not sure how to handle the case where someone leaves off the class.
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| 394 | if ($doimport) {
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| 395 | my ($code, $msg);
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| 396 | if ($rev eq 'n') {
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| 397 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$curlabel, \$itype, \$rdata, $ttl);
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| 398 | } else {
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| 399 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$rdata, \$itype, \$curlabel, $ttl);
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| 400 | }
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| 401 | print "$code: $msg\n";
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| 402 | }
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| 403 | # $i++;
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| 404 | }
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| 405 |
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| 406 |
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| 407 | #print Dumper \%amap;
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| 408 | #print Dumper \%namemap;
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| 409 | #print Dumper \%cmap;
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| 410 |
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| 411 | foreach my $n (keys %amap) {
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| 412 | foreach my $ip (@{$amap{$n}}) {
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| 413 | #print "$ip $n\n";
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| 414 | push @{$namemap{$ip}}, $n unless grep $n, @{$namemap{$ip}};
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| 415 | }
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| 416 | }
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| 417 |
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| 418 | foreach my $c (keys %cmap) {
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| 419 | if ($amap{$c}) {
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| 420 | print Dumper(\@{$amap{$c}});
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| 421 | }
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| 422 | # print $amap{$c};
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| 423 | }
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| 424 |
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| 425 | # cname targ -> IP
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| 426 |
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| 427 | #foreach my $ip (sort keys %namemap) {
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| 428 | # print "$ip ".join(' ', @{$namemap{$ip}})."\n";
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| 429 | #}
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| 430 |
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| 431 | $dnsdb->{dbh}->rollback;
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