| 1 | # dns/trunk/DNSDB/ExportBIND.pm
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| 2 | # BIND data export/publication
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| 3 | # Call through DNSDB.pm's export() sub
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| 4 | ##
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| 5 | # $Id: ExportBIND.pm 863 2022-09-20 20:25:48Z kdeugau $
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| 6 | # Copyright 2022 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 | package DNSDB::ExportBIND;
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| 23 |
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| 24 | use strict;
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| 25 | use warnings;
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| 26 |
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| 27 | sub export {
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| 28 | # expected to be a DNSDB object
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| 29 | my $dnsdb = shift;
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| 30 |
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| 31 | # to be a hash of views/locations, containing lists of zones
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| 32 | my %viewzones;
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| 33 |
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| 34 | # allow for future exports of subgroups of records
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| 35 | my $viewlist = $dnsdb->getLocList(curgroup => 1);
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| 36 |
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| 37 | my $soasth = $dnsdb->{dbh}->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location ".
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| 38 | "FROM records WHERE rdns_id=? AND type=6");
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| 39 | my $recsth = $dnsdb->{dbh}->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location,extract(epoch from stamp),expires,stampactive ".
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| 40 | "FROM records WHERE rdns_id=? AND NOT type=6 ".
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| 41 | "ORDER BY masklen(inetlazy(val)) DESC, inetlazy(val)");
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| 42 |
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| 43 | # Fetch active zone list
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| 44 | my $revsth = $dnsdb->{dbh}->prepare("SELECT rdns_id,revnet,status,changed,default_location FROM revzones WHERE status=1 ".
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| 45 | "ORDER BY masklen(revnet) DESC, rdns_id");
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| 46 | # Unflag changed zones, so we can maybe cache the export and not redo everything every time
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| 47 | my $zonesth = $dnsdb->{dbh}->prepare("UPDATE revzones SET changed='n' WHERE rdns_id=?");
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| 48 | $revsth->execute();
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| 49 | while (my ($revid,$revzone,$revstat,$changed,$defloc) = $revsth->fetchrow_array) {
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| 50 | my $cidr = NetAddr::IP->new($revzone);
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| 51 | my $zfile = $cidr->network->addr."-".$cidr->masklen;
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| 52 | # my $cachefile = "$dnsdb->{exportcache}/$zfile";
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| 53 | # my $tmpcache = "$dnsdb->{exportcache}/tmp.$zfile.$$";
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| 54 | my $tmpcache = "tmp.$zfile.$$"; # safety net. don't overwrite a previous known-good file
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| 55 |
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| 56 | ##fixme: convert logical revzone into .arpa name? maybe take a slice of showrev_arpa?
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| 57 | ##fixme: need to bodge logical non-octet-boundary revzones into octet-boundary revzones
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| 58 | ##fixme: do we do cache files? views balloon the file count stupidly
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| 59 | ## foreach $octetzone $cidr->split(octet-boundary)
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| 60 | ## loclist = SELECT DISTINCT location FROM records WHERE rdns_id = $zid AND inetlazy(val) <<= $octetzone
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| 61 |
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| 62 | #printf "non-octet? %s, %i\n", $cidr->masklen, $cidr->masklen % 8;
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| 63 |
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| 64 |
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| 65 | eval {
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| 66 |
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| 67 | my $arpazone = DNSDB::_ZONE($cidr, 'ZONE', 'r', '.').($cidr->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 68 |
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| 69 | # write fresh records if:
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| 70 | # - we are not using the cache
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| 71 | # - force_refresh is set
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| 72 | # - the zone has changed
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| 73 | # - the cache file does not exist
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| 74 | # - the cache file is empty
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| 75 | if (!$dnsdb->{usecache} || $dnsdb->{force_refresh} || $changed || !-e $cachefile || -z $cachefile) {
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| 76 | if ($dnsdb->{usecache}) {
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| 77 | open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n";
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| 78 | $zonefilehandle = *ZONECACHE;
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| 79 | }
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| 80 |
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| 81 | # fetch a list of views/locations present in the zone. we need to publish a file for each one.
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| 82 | # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path
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| 83 | my (@loclist) = $dnsdb->{dbh}->selectrow_array("SELECT DISTINCT location FROM records WHERE rdns_id = ?", undef, $revid);
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| 84 | push @loclist, $defloc unless grep /$defloc/, @loclist;
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| 85 | my $zonepath = $dnsdb->{bind_export_reverse_zone_path};
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| 86 | my %zonefiles; # to be a hash of file handles.
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| 87 | ##fixme: need to open separate zone files for aggregated metazones eg /22 or /14
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| 88 | foreach my $loc (@loclist) {
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| 89 | my $zfilepath = $zonepath;
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| 90 | $zfilepath =~ s/\%view/$loc/;
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| 91 | $zfilepath =~ s/\%zone/$revzone/;
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| 92 | $zfilepath =~ s/\%arpazone/$arpazone/;
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| 93 | # Just In Case(TM)
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| 94 | $zfilepath =~ s,[^\w./-],_,g;
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| 95 | open $zonefiles{$loc}, ">", $zfilepath;
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| 96 | printf {$zonefiles{$loc}} "; %s in view %s exported %s\n", $arpazone, $loc, scalar(localtime);
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| 97 | print "open zonefile for '$loc', '$zfilepath'\n";
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| 98 | }
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| 99 |
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| 100 | # need to fetch this separately since the rest of the records all (should) have real IPs in val
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| 101 | $soasth->execute($revid);
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| 102 | my (@zsoa) = $soasth->fetchrow_array();
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| 103 | printrec_bind(\%zonefiles, $zsoa[7], 'y', \@loclist, $revzone,
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| 104 | $zsoa[0],$zsoa[1],$zsoa[2],$zsoa[3],$zsoa[4],$zsoa[5],$zsoa[6],$zsoa[8],'');
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| 105 |
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| 106 | $recsth->execute($revid);
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| 107 | my $fullzone = _ZONE($tmpzone, 'ZONE', 'r', '.').($tmpzone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 108 |
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| 109 | while (my ($host, $type, $val, $dist, $weight, $port, $ttl, $recid, $loc, $stamp, $expires, $stampactive)
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| 110 | = $recsth->fetchrow_array) {
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| 111 | next if $recflags{$recid};
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| 112 |
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| 113 | # Check for out-of-zone data
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| 114 | if ($val =~ /\.arpa$/) {
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| 115 | # val is non-IP
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| 116 | if ($val !~ /$fullzone$/) {
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| 117 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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| 118 | next;
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| 119 | }
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| 120 | } else {
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| 121 | my $ipval = new NetAddr::IP $val;
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| 122 | if (!$tmpzone->contains($ipval)) {
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| 123 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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| 124 | next;
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| 125 | }
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| 126 | } # is $val a raw .arpa name?
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| 127 |
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| 128 | # Spaces are evil.
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| 129 | $val =~ s/^\s+//;
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| 130 | $val =~ s/\s+$//;
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| 131 | if ($typemap{$type} ne 'TXT') {
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| 132 | # Leading or trailng spaces could be legit in TXT records.
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| 133 | $host =~ s/^\s+//;
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| 134 | $host =~ s/\s+$//;
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| 135 | }
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| 136 |
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| 137 | printrec_bind($zonefilehandle, $recid, 'y', \%recflags, $revzone,
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| 138 | $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive);
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| 139 |
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| 140 | $recflags{$recid} = 1;
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| 141 |
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| 142 | } # while ($recsth)
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| 143 |
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| 144 | if ($dnsdb->{usecache}) {
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| 145 | close ZONECACHE; # force the file to be written
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| 146 | # catch obvious write errors that leave an empty temp file
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| 147 | if (-s $tmpcache) {
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| 148 | rename $tmpcache, $cachefile
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| 149 | or die "Error overwriting cache file $cachefile with temporary file: $!\n";
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| 150 | }
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| 151 | }
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| 152 |
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| 153 | } # if $changed or cache filesize is 0
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| 154 |
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| 155 | };
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| 156 | if ($@) {
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| 157 | die "error writing ".($dnsdb->{usecache} ? 'new data for ' : '')."$revzone: $@\n";
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| 158 | # error! something borked, and we should be able to fall back on the old cache file
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| 159 | # report the error, somehow.
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| 160 | } else {
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| 161 | # mark zone as unmodified. Only do this if no errors, that way
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| 162 | # export failures should recover a little more automatically.
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| 163 | $zonesth->execute($revid);
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| 164 | }
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| 165 |
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| 166 | # if ($dnsdb->{usecache}) {
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| 167 | # # We've already made as sure as we can that a cached zone file is "good",
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| 168 | # # although possibly stale/obsolete due to errors creating a new one.
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| 169 | # eval {
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| 170 | # open CACHE, "<$cachefile" or die $!;
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| 171 | # print $datafile $_ or die "error copying cached $revzone to master file: $!" while <CACHE>;
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| 172 | # close CACHE;
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| 173 | # };
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| 174 | # die $@ if $@;
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| 175 | # }
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| 176 |
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| 177 |
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| 178 |
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| 179 | } # revsth->fetch
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| 180 |
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| 181 |
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| 182 | # Write the view configuration last, because otherwise we have to be horribly inefficient
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| 183 | # at figuring out which zones are visible/present in which views
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| 184 | if ($viewlist) {
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| 185 | my $tmpconf = "$dnsdb->{bind_zone_conf}.$$"; ##fixme: split filename for prefixing
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| 186 | open BINDCONF, ">", $tmpconf;
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| 187 |
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| 188 | foreach my $view (@{$viewlist}) {
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| 189 | #print Dumper($view);
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| 190 | print BINDCONF "view $view->{location} {\n";
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| 191 | # print "view $view->{location} {\n";
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| 192 | # could also use an acl { ... }; statement, then match-clients { aclname; };, but that gets hairy
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| 193 | # note that some semantics of data visibility need to be handled by the record export, since it's
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| 194 | # not 100% clear if the semantics of a tinydns view with an empty IP list (matches anyone) are the
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| 195 | # same as a BIND view with match-clients { any; };
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| 196 | if ($view->{iplist}) {
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| 197 | print BINDCONF " match-clients { ".join("; ", $view->iplist)."; };\n";
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| 198 | # print " match-clients { ".join("; ", split(/[\s,]+/, $view->{iplist}))."; };\n";
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| 199 | } else {
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| 200 | print BINDCONF " match-clients { any; };\n";
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| 201 | # print " match-clients { any; };\n";
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| 202 | }
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| 203 | foreach my $zone (@{$viewzones{$view->{location}}}) {
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| 204 | ##fixme: notify settings, maybe per-zone?
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| 205 | print qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n);
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| 206 | }
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| 207 | print "};\n\n";
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| 208 | } # foreach @$viewlist
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| 209 | rename $tmpconf, $dnsdb->{bind_zone_conf};
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| 210 | } # if $viewlist
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| 211 |
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| 212 | } # export()
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| 213 |
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| 214 |
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| 215 | # Print individual records in BIND format
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| 216 | sub printrec_bind {
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| 217 | my $dnsdb = shift;
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| 218 | my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl,
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| 219 | $loc, $stamp, $expires, $stampactive) = @_;
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| 220 |
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| 221 | # Just In Case something is lingering in the DB
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| 222 | $loc = '' if !$loc;
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| 223 |
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| 224 | ## And now to the records!
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| 225 |
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| 226 | if ($typemap{$type} eq 'SOA') {
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| 227 | # host contains pri-ns:responsible
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| 228 | # val is abused to contain refresh:retry:expire:minttl
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| 229 | # let's be explicit about abusing $host and $val
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| 230 | my ($email, $primary) = (split /:/, $host)[0,1];
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| 231 | my ($refresh, $retry, $expire, $min_ttl) = (split /:/, $val)[0,1,2,3];
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| 232 | my $serial = 0; # fail less horribly than leaving it empty?
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| 233 | # just snarfing the right SOA serial for the zone type
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| 234 | if ($revrec eq 'y') {
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| 235 | ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM revzones WHERE revnet=?", undef, $zone);
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| 236 | } else {
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| 237 | ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM domains WHERE domain=?", undef, $zone);
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| 238 | } # revrec <> 'y'
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| 239 | # suppress a "uninitialized value" warning. should be impossible but...
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| 240 | # abuse hours as the last digit pair of the serial for simplicity
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| 241 | ##fixme?: alternate SOA serial schemes?
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| 242 | $serial = strftime("%Y%m%d%H", localtime()) if !$serial;
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| 243 | $primary .= "." if $primary !~ /\.$/;
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| 244 | $email .= "." if $email !~ /\.$/;
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| 245 | # print *{$zonefiles->{$loc}} "Z$zone:$primary:$email:$serial:$refresh:$retry:$expire:$min_ttl:$ttl:$stamp:$loc\n"
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| 246 | # or die $!;
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| 247 | print *{$zonefiles->{$loc}} "$zone $ttl IN SOA $primary $email ( $serial $refresh $retry $expire $min_ttl )\n"
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| 248 | or die "couldn't write $zone SOA: $!";
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| 249 | } # SOA
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| 250 |
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| 251 | elsif ($typemap{$type} eq 'A') {
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| 252 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 253 | # print $datafile "+$host:$val:$ttl:$stamp:$loc\n" or die $!;
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| 254 | print {$zonefiles->{$loc}} "$host $ttl IN A $val\n" or die $!;
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| 255 | } # A
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| 256 |
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| 257 | elsif ($typemap{$type} eq 'NS') {
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| 258 | if ($revrec eq 'y') {
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| 259 | $val = NetAddr::IP->new($val);
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| 260 |
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| 261 | ##fixme: conversion for sub-/24 delegations in reverse zones?
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| 262 | # if (!$val->{isv6} && ($val->masklen > 24)) {
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| 263 | # }
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| 264 |
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| 265 | # print {$zonefiles->{$loc}} "$zone $ttl IN NS $host\n";
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| 266 | print "$zone $ttl IN NS $host\n" or die $!;
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| 267 |
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| 268 | } else {
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| 269 | # print $datafile "\&$host"."::$val:$ttl:$stamp:$loc\n" or die $!;
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| 270 | }
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| 271 | } # NS
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| 272 |
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| 273 | elsif ($typemap{$type} eq 'AAAA') {
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| 274 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 275 | my $altgrp = 0;
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| 276 | my @altconv;
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| 277 | # Split in to up to 8 groups of hex digits (allows for IPv6 :: 0-collapsing)
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| 278 | foreach (split /:/, $val) {
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| 279 | if (/^$/) {
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| 280 | # flag blank entry; this is a series of 0's of (currently) unknown length
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| 281 | $altconv[$altgrp++] = 's';
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| 282 | } else {
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| 283 | # call sub to convert 1-4 hex digits to 2 string-rep octal bytes
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| 284 | $altconv[$altgrp++] = octalize($_)
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| 285 | }
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| 286 | }
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| 287 | my $prefix = ":$host:28:";
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| 288 | foreach my $octet (@altconv) {
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| 289 | # if not 's', output
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| 290 | $prefix .= $octet unless $octet =~ /^s$/;
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| 291 | # if 's', output (9-array length)x literal '\000\000'
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| 292 | $prefix .= '\000\000'x(9-$altgrp) if $octet =~ /^s$/;
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| 293 | }
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| 294 | print {$zonefiles->{$loc}} "$host $ttl IN AAAA $val\n" or die $!;
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| 295 | } # AAAA
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| 296 |
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| 297 | elsif ($typemap{$type} eq 'TXT') {
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| 298 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 299 | print {$zonefiles->{$loc}} "$host $ttl IN TXT \"$val\"\n" or die $!;
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| 300 | } # TXT
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| 301 |
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| 302 | elsif ($typemap{$type} eq 'CNAME') {
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| 303 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 304 | print {$zonefiles->{$loc}} "$host $ttl IN CNAME $val\n" or die $!;
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| 305 | } # CNAME
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| 306 |
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| 307 | elsif ($typemap{$type} eq 'SRV') {
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| 308 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 309 | print {$zonefiles->{$loc}} "$host $ttl IN SRV $distance $weight $port $val\n" or die $!;
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| 310 | } # SRV
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| 311 |
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| 312 | elsif ($typemap{$type} eq 'RP') {
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| 313 | # ($host,$val) = __revswap($host,$val) if $revrec eq 'y';
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| 314 | print {$zonefiles->{$loc}} "$host $ttl IN RP $val\n" or die $!;
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| 315 | } # RP
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| 316 |
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| 317 |
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| 318 | elsif ($typemap{$type} eq 'PTR') {
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| 319 | # $$recflags{$val}++;
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| 320 | if ($revrec eq 'y') {
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| 321 |
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| 322 | if ($val =~ /\.arpa$/) {
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| 323 | # someone put in the formal .arpa name. humor them.
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| 324 | print {$zonefiles->{$loc}} "$val $ttl IN PTR $host\n" or die $!;
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| 325 | } else {
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| 326 | $zone = NetAddr::IP->new($zone);
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| 327 | if (!$zone->{isv6} && $zone->masklen > 24) {
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| 328 | # sub-octet v4 zone
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| 329 | ($val) = ($val =~ /\.(\d+)$/);
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| 330 | print {$zonefiles->{$loc}} "$val.".DNSDB::_ZONE($zone, 'ZONE', 'r', '.').'.in-addr.arpa'.
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| 331 | " $ttl IN PTR $host\n"
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| 332 | or die $!;
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| 333 | } else {
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| 334 | # not going to care about strange results if $val is not an IP value and is resolveable in DNS
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| 335 | $val = NetAddr::IP->new($val);
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| 336 | print {$zonefiles->{$loc}} DNSDB::_ZONE($val, 'ZONE', 'r', '.').($val->{isv6} ? '.ip6.arpa' : '.in-addr.arpa').
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| 337 | " $ttl IN PTR $host\n"
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| 338 | or die $!;
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| 339 |
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| 340 | }
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| 341 | } # non-".arpa" $val
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| 342 |
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| 343 | } else {
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| 344 | # PTRs in forward zones are less bizarre and insane than some other record types
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| 345 | # in reverse zones... OTOH we can't validate them any which way, so we cross our
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| 346 | # fingers and close our eyes and make it Someone Else's Problem.
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| 347 | print {$zonefiles->{$loc}} "^$host:$val:$ttl:$stamp:$loc\n" or die $!;
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| 348 | }
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| 349 | } # PTR
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| 350 |
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| 351 | elsif ($type == 65280) { # A+PTR
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| 352 | # Recurse to PTR or A as appropriate because BIND et al don't share
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| 353 | # the tinydns concept of merged forward/reverse records
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| 354 | # $$recflags{$val}++;
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| 355 | if ($revrec eq 'y') {
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| 356 | printrec_bind($zonefiles, $recid, $revrec, $loclist, $zone, $host, 12, $val, $distance, $weight, $port, $ttl,
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| 357 | $loc, $stamp, $expires, $stampactive);
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| 358 | #print {$zonefiles->{$loc}} "=$host:$val:$ttl:$stamp:$loc\n" or die $!;
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| 359 | # printrec_bind(\%zonefiles, $recid, 'y', \@loclist, $revzone,
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| 360 | # $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive);
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| 361 | # my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl,
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| 362 | # $loc, $stamp, $expires, $stampactive) = @_;
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| 363 | } else {
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| 364 | printrec_bind($zonefiles, $recid, $revrec, $loclist, $zone, $host, 1, $val, $distance, $weight, $port, $ttl,
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| 365 | $loc, $stamp, $expires, $stampactive);
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| 366 | }
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| 367 | } # A+PTR
|
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| 368 |
|
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| 369 | } # printrec_bind()
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| 370 |
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| 371 |
|
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| 372 | 1;
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