| 1 | #!/usr/bin/perl
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| 2 | # Import a BIND zone file
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| 3 | # Note we are not using Net:DNS::ZoneFile, because we want to convert $GENERATE
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| 4 | # directives straight into PTR template or A+PTR template metarecords
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| 5 | ##
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| 6 | # Copyright 2020 Kris Deugau <kdeugau@deepnet.cx>
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| 7 | #
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| 8 | # This program is free software: you can redistribute it and/or modify
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| 9 | # it under the terms of the GNU General Public License as published by
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| 10 | # the Free Software Foundation, either version 3 of the License, or
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| 11 | # (at your option) any later version.
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| 12 | #
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| 13 | # This program is distributed in the hope that it will be useful,
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| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | # GNU General Public License for more details.
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| 17 | #
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| 18 | # You should have received a copy of the GNU General Public License
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| 19 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 20 | ##
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| 21 |
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| 22 | use strict;
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| 23 | use warnings;
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| 24 | use Data::Dumper;
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| 25 |
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| 26 | use lib '.';
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| 27 | use DNSDB;
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| 28 |
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| 29 | my $dnsdb = new DNSDB;
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| 30 | my $doimport = 0;
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| 31 |
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| 32 | #print Dumper(\%reverse_typemap);
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| 33 |
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| 34 | local $dnsdb->{dbh}->{AutoCommit} = 0;
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| 35 | local $dnsdb->{dbh}->{RaiseError} = 1;
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| 36 |
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| 37 | ##fixme: command arguments/flags to set these to alternate values
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| 38 | my $group = 1;
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| 39 | my $status = 1;
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| 40 | my $location = '';
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| 41 | # we'll update this with the actual serial number from the SOA record later
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| 42 | my $serial = time();
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| 43 |
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| 44 | my $zname = shift @ARGV;
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| 45 | my $origzone = $zname;
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| 46 | die "usage: bind-import zonename\n" if !$zname;
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| 47 | my $rev = 'n';
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| 48 | my $zid;
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| 49 |
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| 50 | my %amap;
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| 51 | my %namemap;
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| 52 | my %cmap;
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| 53 |
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| 54 | ##fixme: this is wrong, BIND zone files are generally complete and we're adding. merging records is an entire fridge full of worms.
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| 55 | ##fixme: for import, should arguably check for zone *non*existence
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| 56 | if ($zname =~ /\.arpa\.?$/ || $zname =~ m,^[\d./]+$,) {
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| 57 | $rev = 'y';
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| 58 | $zname = _zone2cidr($zname) if $zname =~ /\.arpa\.?$/;
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| 59 | $zid = $dnsdb->revID($zname,':ANY:');
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| 60 | if ($zid) {
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| 61 | # die "zone $origzone already present, not merging records\n";
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| 62 | #$zname = new NetAddr::IP $zname;
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| 63 | # $zname = DNSDB::_ZONE($zname, 'ZONE', 'r', '.').($zname->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 64 | }
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| 65 | # $zid = $dnsdb->{dbh}->do("INSERT INTO revzones (revnet,group_id,status,default_location,zserial) VALUES (?,?,?,?,?) RETURNING rnds_id",
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| 66 | # undef, ($zname, $group, $status, $location, $serial));
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| 67 |
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| 68 | } else {
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| 69 | $zid = $dnsdb->domainID($zname,':ANY:');
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| 70 | if ($zid) {
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| 71 | # die "zone $origzone already present, not merging records\n";
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| 72 | }
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| 73 | # $zid = $dnsdb->{dbh}->do("INSERT INTO domains (domain,group_id,status,default_location,zserial) VALUES (?,?,?,?,?) RETURNING domain_id",
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| 74 | # undef, ($zname, $group, $status, $location, $serial));
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| 75 | }
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| 76 |
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| 77 | die "error creating zone stub for $zname: ".$dnsdb->{dbh}->errstr if !$zid;
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| 78 |
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| 79 |
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| 80 |
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| 81 | # still no sane way to expose a human-friendly view tag on the command line.
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| 82 | my $view = shift @ARGV;
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| 83 | $view = '' if !$view;
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| 84 |
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| 85 | ##fixme: retrieve defttl from SOA record
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| 86 | my $zonettl = 900;
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| 87 | my $defttl = $zonettl;
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| 88 | my $origin = "$zname."; # to append to unqualified names
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| 89 | my %foundtypes;
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| 90 |
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| 91 | # need to spin up a full state machine-ish thing, because BIND zone files are all about context
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| 92 | # see ch4, p56-72 in the grasshopper book
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| 93 | my $prevlabel = '';
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| 94 | my $curlabel = '';
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| 95 |
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| 96 | my $i = 0;
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| 97 |
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| 98 | while (my $rec = <>) {
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| 99 | chomp $rec;
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| 100 | next if $rec =~ /^\s*$/;
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| 101 | next if $rec =~ /^\s*;/; # comments
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| 102 | next if $rec =~ /^\s*\)/; # SOA closing (possibly other records too?)
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| 103 | # arguably should do some more targeted voodoo when parsing the SOA details
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| 104 |
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| 105 | ##fixme: use external skiplist
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| 106 | # skip stale records that have no value
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| 107 | next if /^ip-192-168-1(12|20)-\d+/;
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| 108 | next if /ip.add.re.\d+\s*$/;
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| 109 |
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| 110 | $i++;
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| 111 | #last if $i > 4;
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| 112 | #print "line $i: ($rec)\n";
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| 113 | if (my ($macro,$mdetail) = ($rec =~ /^\s*\$(TTL|ORIGIN|INCLUDE|GENERATE)\s+(.+)/) ) {
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| 114 | # macro sort of thing; $TTL and $ORIGIN most common. $INCLUDE is a thing, expect it to be rare in live use tho
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| 115 | if ($macro eq 'TTL') {
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| 116 | $mdetail =~ s/\s*;.+$//;
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| 117 | if ($mdetail =~ /^\d+$/) {
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| 118 | $defttl = $mdetail;
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| 119 | } else {
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| 120 | warn "invalid \$TTL: $rec\n";
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| 121 | }
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| 122 | } elsif ($macro eq 'ORIGIN') {
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| 123 | ##fixme: going to skip the stupid case of "$ORIGIN com." and the like that lie
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| 124 | # between . and the root domain we were told we're importing; anyone using such
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| 125 | # a mess outside the root servers is clearly insane
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| 126 |
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| 127 | # $ORIGIN supports cascading/nesting, by watching for fully-qualified names vs partial names.
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| 128 |
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| 129 | print "origin ($mdetail)\n";
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| 130 | if ($mdetail =~ /\.$/) {
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| 131 | $origin = $mdetail;
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| 132 | } else {
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| 133 | # append current origin to unqualified origin
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| 134 | $origin = "$mdetail.$origin";
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| 135 | }
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| 136 |
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| 137 | # if ($mdetail eq '.' || $mdetail =~ /$zname\.$/ || $zname =~ /$mdetail\.$/) {
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| 138 | # $origin = $mdetail;
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| 139 | # } else {
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| 140 | # # 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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| 141 | # die "bad \$ORIGIN: $_\n";
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| 142 | # }
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| 143 |
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| 144 | }
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| 145 | elsif ($macro eq 'GENERATE') {
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| 146 | # needs to generate CIDR range(s) as needed to match the start/stop points
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| 147 | }
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| 148 | # not handling $INCLUDE or $GENERATE (altho the latter seems to be mostly a less-flexible version of the template types)
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| 149 | next;
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| 150 | }
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| 151 |
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| 152 | my $origrec = $rec;
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| 153 |
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| 154 | # leading whitespace indicates "same label as last record"
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| 155 | if ($rec =~ /^\s/) {
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| 156 | $curlabel = $prevlabel;
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| 157 | print " found empty label, using previous label\n";
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| 158 | } else {
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| 159 | ($curlabel) = ($rec =~ /^([\w\@_.-]+)\s/);
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| 160 | }
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| 161 |
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| 162 | print " found '$curlabel'\n";
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| 163 |
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| 164 | # magic name!
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| 165 | $curlabel = "$zname." if $curlabel eq '@';
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| 166 |
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| 167 | # append $ORIGIN if name is not fully qualified.
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| 168 | if ($curlabel !~ /\.$/) {
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| 169 | $curlabel .= ($origin eq '.' ? '.' : ".$origin");
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| 170 | }
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| 171 | print " expanded '$curlabel'\n";
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| 172 |
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| 173 | # hack pthbptt
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| 174 | #$curlabel =~ s/\.\.$/./;
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| 175 | # check for zone scope. skip bad records.
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| 176 | if ($curlabel !~ /$zname.$/) {
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| 177 | warn "bad record $origrec, maybe bad \$ORIGIN?\n";
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| 178 | last;
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| 179 | next;
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| 180 | }
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| 181 |
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| 182 | # trim the label, if any
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| 183 | $rec =~ s/^([\w\@_.-]*)\s+//;
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| 184 |
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| 185 | # # records must begin in the first column, no leading whitespace
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| 186 | # my ($name) = /^([\w\@_.-]+)\s/;
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| 187 |
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| 188 | # foo IN A 1.2.3.4
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| 189 | # IN A 2.3.4.5
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| 190 | # =
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| 191 | # foo.zone. IN A 1.2.3.4
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| 192 | # foo.zone. IN A 2.3.4.5
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| 193 |
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| 194 | # # "empty" label records inherit the previous label
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| 195 | # # RRs start in the first column by definition, so leading whitespace indicates an inherited label
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| 196 | # if (/^\s+/) {
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| 197 | # # fatal error. if there is no previous label, we can by definition not set
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| 198 | # # the current label based on it. this can only happen on the very first
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| 199 | # # record, following records will *ALWAYS* have a previous label
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| 200 | # die "bad first record ($_): no previous label\n" if !$prevlabel;
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| 201 | # $name = $prevlabel;
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| 202 | # }
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| 203 |
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| 204 | #print "$i ($rec)\n";#\t$curlabel";
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| 205 |
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| 206 |
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| 207 |
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| 208 |
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| 209 | # # append zone name to record name if missing AND not dot-terminated;
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| 210 | # # this happens automagically for forward zones, but not reverse because Reasons. (fixme?)
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| 211 | # # suck up and deal with the error if the dot-termiated name is out of zone; should be
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| 212 | # # impossible with valid BIND zone file but...
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| 213 | # if ($name !~ /\.$/) {
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| 214 | # $name .= ".$zname" if $name !~ /$zname$/;
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| 215 | # } else {
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| 216 | # warn "skipping out-of-zone record:\n\t($_)\n" if $name !~ /$zname\.$/;
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| 217 | # next;
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| 218 | # }
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| 219 |
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| 220 |
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| 221 | my $nc = 0;
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| 222 | my $class = 'IN';
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| 223 | my $type;
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| 224 | my $ttl;
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| 225 | my $distance;
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| 226 | my $weight;
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| 227 | my $port;
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| 228 | my $badrec;
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| 229 | my $curatom = 'class';
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| 230 |
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| 231 | eval {
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| 232 | for (; $nc < 3; $nc++) {
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| 233 | my ($atom) = ($rec =~ /^([\w\d.]+)\s/);
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| 234 | # should be safe?
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| 235 | last if !$atom;
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| 236 | last if $type;
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| 237 | #print "nc:$nc: $atom\n";
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| 238 | if ($atom =~ /^\d+$/) {
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| 239 | if (defined($ttl)) {
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| 240 | die "bad record ($origrec)\n";
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| 241 | # warn "bad record ($origrec)\n";
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| 242 | # $badrec = 1;
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| 243 | # last;
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| 244 | } else {
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| 245 | if ($curatom ne 'class' && $curatom ne 'ttl') {
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| 246 | die "bad record ($origrec)\n";
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| 247 | # warn "bad 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 = 'ttl';
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| 252 | $ttl = $atom;
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| 253 | }
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| 254 | }
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| 255 |
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| 256 | elsif ($atom =~ /^IN|CS|CH|HS$/) {
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| 257 | #print "a$nc: d2: atom [$atom]\n $rec\n" if $i == $debugid;
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| 258 | if ($atom =~ /CS|CH|HS/) {
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| 259 | die "unsupported class $atom in record ($origrec)\n";
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| 260 | # warn "unsupported class $atom in record ($origrec)\n";
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| 261 | # $badrec = 1;
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| 262 | # last;
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| 263 | }
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| 264 | $curatom = 'class';
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| 265 | $class = $atom;
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| 266 | }
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| 267 |
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| 268 | elsif ($atom =~ /^[A-Z]+/) {
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| 269 | # print "dbg: type $atom\n";
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| 270 | if ($reverse_typemap{$atom}) {
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| 271 | $type = $atom;
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| 272 | } else {
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| 273 | die "unknown type $atom in record ($origrec)\n";
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| 274 | }
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| 275 | }
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| 276 | $rec =~ s/^$atom\s*//;
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| 277 | }
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| 278 | };
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| 279 | if ($@) {
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| 280 | warn $@;
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| 281 | next;
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| 282 | }
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| 283 |
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| 284 | ##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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| 285 | # set default TTL here so we can detect a TTL in the loop above
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| 286 | $ttl = $defttl if !defined($ttl);
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| 287 |
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| 288 | #next if $badrec;
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| 289 |
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| 290 |
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| 291 | ##fixme: drop curlabel? not sure it's needed
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| 292 | #$curlabel = $name;
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| 293 | $prevlabel = $curlabel;
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| 294 |
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| 295 |
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| 296 |
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| 297 | ## by convention the optional TTL leads the optional class, but they're apparently swappable.
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| 298 | # my ($ttl) = /^(\d+)?\s/;
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| 299 | # if (defined $ttl) {
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| 300 | # # TTL may be zero
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| 301 | # s/(\d+)?\s+//;
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| 302 | # } else {
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| 303 | # # Fall back to zone default TTL
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| 304 | # $ttl = $zonettl;
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| 305 | # }
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| 306 | # my ($class) = /^(IN|CS|CH|HS|\d+)\s/;
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| 307 | # if (defined $class) {
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| 308 | # if ($class =~ /\d+/) {
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| 309 | #
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| 310 | # }
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| 311 | # if ($class ne 'IN') {
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| 312 | # warn "Non-Internet class ($class) records not supported:\n\t$origrec\n";
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| 313 | # next;
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| 314 | # }
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| 315 | # s/(IN|CS|CH|HS)\s+//;
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| 316 | # } else {
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| 317 | # $class = 'IN';
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| 318 | # }
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| 319 | # my ($type) = /([A-Z-]+)\s/;
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| 320 | # if (!$reverse_typemap{$type}) {
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| 321 | # warn "Unknown type $type, skipping\n\t($rec)\n";
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| 322 | # next;
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| 323 | # }
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| 324 | # s/([A-Z-]+)\s+//;
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| 325 | # chomp;
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| 326 |
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| 327 |
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| 328 | my $itype = $reverse_typemap{$type};
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| 329 | my $rdata = $rec;
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| 330 |
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| 331 | # SOA is the only type that may span multiple lines. Probably. Note even AXFRed zones write multiline SOA records:
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| 332 | #@ IN SOA test.example.invalid. test.example.invalid. (2020082500 7200 900 604800 3600)
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| 333 | # IN NS olddns.example.com.
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| 334 | # IN MX 1 fred.foo.bar.invalid.
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| 335 | #foo IN A 192.168.16.45
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| 336 | # AXFR'ed zone file gets written as
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| 337 | #$ORIGIN .
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| 338 | #$TTL 3600 ; 1 hour
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| 339 | #example.invalid IN SOA test.example.invalid. test.example.invalid. (
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| 340 | # 2020082500 ; serial
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| 341 | # 7200 ; refresh (2 hours)
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| 342 | # 900 ; retry (15 minutes)
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| 343 | # 604800 ; expire (1 week)
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| 344 | # 3600 ; minimum (1 hour)
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| 345 | # )
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| 346 | # NS olddns.example.com.
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| 347 | # MX 1 fred.foo.bar.invalid.
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| 348 | #$ORIGIN example.invalid.
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| 349 | #foo A 192.168.16.45
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| 350 | $foundtypes{$type}++;
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| 351 |
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| 352 | ##fixme: strip trailing . here? dnsadmin's normalized internal format omits it, some validation fails or may go funky
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| 353 |
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| 354 | if ($type eq 'SOA') {
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| 355 | my ($ns, $adminmail) = ($rdata =~ /([\w.]+)\s+([\w.]+)\s+\(/);
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| 356 | die "Can't parse gibberish SOAish record: $rec\n" if !$ns;
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| 357 | $rdata =~ s/([\w.]+)\s+([\w.]+)\s+\(\s*//;
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| 358 |
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| 359 | # There are probably more efficient ways to do this but the SOA record
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| 360 | # format is essentially character based, not line-based.
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| 361 | # In theory the SOA serial etc may be spread over up to 5 lines, in any combination.
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| 362 |
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| 363 | # Parse fields from $rdata if present
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| 364 | my @soabits;
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| 365 | my @soafirst = split /\s+/, $rdata;
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| 366 | while (my $f = shift @soafirst) {
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| 367 | last if $f !~ /^\d/;
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| 368 | push @soabits, $f;
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| 369 | }
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| 370 |
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| 371 | # Read more lines if we don't have enough SOA fields filled
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| 372 | while (scalar(@soabits) < 5) {
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| 373 | my $tmp = <>;
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| 374 | $tmp =~ s/^\s*//;
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| 375 | my @tmpsoa = split /\s+/, $tmp;
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| 376 | while (my $f = shift @tmpsoa) {
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| 377 | last if $f !~ /^\d/;
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| 378 | push @soabits, $f;
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| 379 | }
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| 380 | if (scalar(@soabits) == 5) {
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| 381 | last;
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| 382 | }
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| 383 | }
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| 384 | # $dnsdb->{dbh}->do("UPDATE [zonetable] SET serial = ? WHERE [idfield] = ?");
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| 385 | # $dnsdb->{dbh}->do("INSERT INTO records () VALUES ()");
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| 386 | # next;
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| 387 | #Zfqdn:mname:rname:ser:ref:ret:exp:min:ttl:timestamp:lo
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| 388 | #print "Z$zname:$ns:$adminmail:$soabits[0]:$soabits[1]:$soabits[2]:$soabits[3]:$soabits[4]:$ttl\n";
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| 389 | } # SOA
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| 390 |
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| 391 |
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| 392 | # we're using DNSDB::addrec(), so we'll skip detailed validation of other records. Most won't need further breakdown
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| 393 |
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| 394 | elsif ($type eq 'A') {
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| 395 | #print "+$curlabel:$rdata:$ttl\n";
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| 396 | }
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| 397 |
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| 398 | elsif ($type eq 'NS') {
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| 399 | #print "\&$curlabel::$rdata:$ttl\n";
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| 400 | }
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| 401 |
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| 402 | elsif ($type eq 'CNAME') {
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| 403 | #print "C$curlabel:$rdata:$ttl\n";
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| 404 | }
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| 405 |
|
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| 406 | elsif ($type eq 'PTR') {
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| 407 | }
|
|---|
| 408 |
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|---|
| 409 | elsif ($type eq 'MX') {
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| 410 | ($distance) = ($rdata =~ /^(\d+)\s+/);
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| 411 | if (!defined($distance)) {
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| 412 | warn "malformed MX record: $origrec, skipping\n";
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| 413 | next;
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| 414 | }
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|---|
| 415 | $rdata =~ s/^\d+\s+//;
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| 416 | }
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|---|
| 417 |
|
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| 418 | elsif ($type eq 'TXT') {
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|---|
| 419 | # Quotes may arguably be syntactically required, but they're not actually part of the record data
|
|---|
| 420 | $rdata =~ s/^"//;
|
|---|
| 421 | $rdata =~ s/"$//;
|
|---|
| 422 | #print "'$curlabel:$rdata:$ttl\n";
|
|---|
| 423 | }
|
|---|
| 424 |
|
|---|
| 425 | elsif ($type eq 'RP') {
|
|---|
| 426 | }
|
|---|
| 427 |
|
|---|
| 428 | elsif ($type eq 'AAAA') {
|
|---|
| 429 | }
|
|---|
| 430 |
|
|---|
| 431 | elsif ($type eq 'SRV') {
|
|---|
| 432 | ($distance, $weight, $port) = ($rdata =~ /^(\d+)\s+(\d+)\s+(\d+)\s+/);
|
|---|
| 433 | if ( !defined($distance) || !defined($weight) || !defined($port) ) {
|
|---|
| 434 | warn "malformed SRV record: $origrec, skipping\n";
|
|---|
| 435 | next;
|
|---|
| 436 | }
|
|---|
| 437 | $rdata =~ s/^\d+\s+\d+\s+\d+\s+//;
|
|---|
| 438 | }
|
|---|
| 439 |
|
|---|
| 440 | # basically a dedicated clone of TXT, not sure anything actually looks up type SPF.
|
|---|
| 441 | # BIND autogenerates them from SPF TXT records.
|
|---|
| 442 | elsif ($type eq 'SPF') {
|
|---|
| 443 | # Quotes may arguably be syntactically required, but they're not actually part of the record data
|
|---|
| 444 | $rdata =~ s/^"//;
|
|---|
| 445 | $rdata =~ s/"$//;
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | # elsif ($type eq 'TXT') {
|
|---|
| 449 | # elsif ($type eq 'TXT') {
|
|---|
| 450 |
|
|---|
| 451 | else {
|
|---|
| 452 | warn "unsupported type $type, may not import correctly\n";
|
|---|
| 453 | }
|
|---|
| 454 |
|
|---|
| 455 | no warnings qw(uninitialized);
|
|---|
| 456 | #print "parsed: '$curlabel' '$class' '$ttl' '$type'->'$itype' '$rdata'\n";
|
|---|
| 457 | #print;
|
|---|
| 458 | #;imap IN 900 CNAME deepnet.cx.
|
|---|
| 459 | ##fixme: not sure how to handle the case where someone leaves off the class.
|
|---|
| 460 | if ($doimport) {
|
|---|
| 461 | my ($code, $msg);
|
|---|
| 462 | if ($rev eq 'n') {
|
|---|
| 463 | ($code,$msg) = $dnsdb->addRec('n', $rev, $zid, \$curlabel, \$itype, \$rdata, $ttl,
|
|---|
| 464 | $location, undef, undef, $distance, $weight, $port);
|
|---|
| 465 | } else {
|
|---|
| 466 | ($code,$msg) = $dnsdb->addRec('y', $rev, $zid, \$rdata, \$itype, \$curlabel, $ttl,
|
|---|
| 467 | $location, undef, undef, $distance, $weight, $port);
|
|---|
| 468 | }
|
|---|
| 469 | print "$code: $msg\n";
|
|---|
| 470 | }
|
|---|
| 471 | # $i++;
|
|---|
| 472 | }
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | #print Dumper \%amap;
|
|---|
| 476 | #print Dumper \%namemap;
|
|---|
| 477 | #print Dumper \%cmap;
|
|---|
| 478 |
|
|---|
| 479 | #foreach my $n (keys %amap) {
|
|---|
| 480 | # foreach my $ip (@{$amap{$n}}) {
|
|---|
| 481 | ##print "$ip $n\n";
|
|---|
| 482 | # push @{$namemap{$ip}}, $n unless grep $n, @{$namemap{$ip}};
|
|---|
| 483 | # }
|
|---|
| 484 | #}
|
|---|
| 485 |
|
|---|
| 486 | #foreach my $c (keys %cmap) {
|
|---|
| 487 | # if ($amap{$c}) {
|
|---|
| 488 | # print Dumper(\@{$amap{$c}});
|
|---|
| 489 | # }
|
|---|
| 490 | ## print $amap{$c};
|
|---|
| 491 | #}
|
|---|
| 492 |
|
|---|
| 493 | # cname targ -> IP
|
|---|
| 494 |
|
|---|
| 495 | #foreach my $ip (sort keys %namemap) {
|
|---|
| 496 | # print "$ip ".join(' ', @{$namemap{$ip}})."\n";
|
|---|
| 497 | #}
|
|---|
| 498 |
|
|---|
| 499 | $dnsdb->{dbh}->rollback;
|
|---|
| 500 |
|
|---|
| 501 | foreach my $t (keys %foundtypes) {
|
|---|
| 502 | print "found $t: $foundtypes{$t}\n";
|
|---|
| 503 | }
|
|---|
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