| 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 854 2022-09-15 20:03:14Z 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 $self = shift;
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| 30 | my $dbh = $self->{dbh};
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| 31 |
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| 32 | # to be a hash of views/locations, containing lists of zones
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| 33 | my %viewzones;
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| 34 |
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| 35 | # allow for future exports of subgroups of records
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| 36 | my $viewlist = $self->getLocList(curgroup => 1);
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| 37 |
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| 38 | my $soasth = $dbh->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location ".
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| 39 | "FROM records WHERE rdns_id=? AND type=6");
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| 40 | my $recsth = $dbh->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location,extract(epoch from stamp),expires,stampactive ".
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| 41 | "FROM records WHERE rdns_id=? AND NOT type=6 ".
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| 42 | "ORDER BY masklen(inetlazy(val)) DESC, inetlazy(val)");
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| 43 |
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| 44 | # Fetch active zone list
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| 45 | my $revsth = $self->{dbh}->prepare("SELECT rdns_id,revnet,status,changed,default_location FROM revzones WHERE status=1 ".
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| 46 | "ORDER BY masklen(revnet) DESC, rdns_id");
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| 47 | # Unflag changed zones, so we can maybe cache the export and not redo everything every time
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| 48 | my $zonesth = $self->{dbh}->prepare("UPDATE revzones SET changed='n' WHERE rdns_id=?");
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| 49 | $revsth->execute();
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| 50 | while (my ($revid,$revzone,$revstat,$changed,$defloc) = $revsth->fetchrow_array) {
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| 51 | my $tmpzone = NetAddr::IP->new($revzone);
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| 52 | my $zfile = $tmpzone->network->addr."-".$tmpzone->masklen;
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| 53 | # my $cachefile = "$self->{exportcache}/$zfile";
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| 54 | # my $tmpcache = "$self->{exportcache}/tmp.$zfile.$$";
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| 55 | my $tmpcache = "tmp.$zfile.$$"; # safety net. don't overwrite a previous known-good file
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| 56 |
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| 57 | ##fixme: convert logical revzone into .arpa name? maybe take a slice of showrev_arpa?
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| 58 | ##fixme: need to bodge logical non-octet-boundary revzones into octet-boundary revzones
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| 59 | ##fixme: do we do cache files? views balloon the file count stupidly
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| 60 |
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| 61 |
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| 62 | eval {
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| 63 |
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| 64 | # write fresh records if:
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| 65 | # - we are not using the cache
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| 66 | # - force_refresh is set
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| 67 | # - the zone has changed
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| 68 | # - the cache file does not exist
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| 69 | # - the cache file is empty
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| 70 | if (!$self->{usecache} || $self->{force_refresh} || $changed || !-e $cachefile || -z $cachefile) {
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| 71 | if ($self->{usecache}) {
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| 72 | open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n";
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| 73 | $zonefilehandle = *ZONECACHE;
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| 74 | }
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| 75 |
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| 76 | # fetch a list of views/locations present in the zone. we need to publish a file for each one.
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| 77 | # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path
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| 78 | my (@loclist) = $self->{dbh}->selectrow_array("SELECT DISTINCT location FROM records WHERE rdns_id = ?", undef, $revid);
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| 79 | push @loclist, $defloc unless grep /$defloc/, @loclist;
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| 80 | my $zonepath = $self->{bind_export_zone_path};
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| 81 | my %zonefiles; # to be a list of file handles.
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| 82 | ##fixme: convert logical revzone into .arpa name
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| 83 | foreach my $loc (@loclist) {
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| 84 | my $zfilepath = $zonepath;
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| 85 | $zfilepath =~ s/\%view/$loc/;
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| 86 | $zfilepath =~ s/\%zone/$revzone/;
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| 87 | # Just In Case(TM)
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| 88 | $zfilepath =~ s,[^\w./-],_,g;
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| 89 | #open $zonefiles{$loc}, ">", $zfilepath;
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| 90 | print "open zonefile for '$loc', '$zfilepath'\n";
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| 91 | }
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| 92 |
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| 93 | # need to fetch this separately since the rest of the records all (should) have real IPs in val
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| 94 | $soasth->execute($revid);
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| 95 | my (@zsoa) = $soasth->fetchrow_array();
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| 96 | printrec_bind($zonefilehandle, $zsoa[7], 'y',\%recflags,$revzone,
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| 97 | $zsoa[0],$zsoa[1],$zsoa[2],$zsoa[3],$zsoa[4],$zsoa[5],$zsoa[6],$zsoa[8],'');
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| 98 |
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| 99 | $recsth->execute($revid);
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| 100 | my $fullzone = _ZONE($tmpzone, 'ZONE', 'r', '.').($tmpzone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 101 |
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| 102 | while (my ($host, $type, $val, $dist, $weight, $port, $ttl, $recid, $loc, $stamp, $expires, $stampactive)
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| 103 | = $recsth->fetchrow_array) {
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| 104 | next if $recflags{$recid};
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| 105 |
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| 106 | # Check for out-of-zone data
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| 107 | if ($val =~ /\.arpa$/) {
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| 108 | # val is non-IP
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| 109 | if ($val !~ /$fullzone$/) {
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| 110 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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| 111 | next;
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| 112 | }
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| 113 | } else {
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| 114 | my $ipval = new NetAddr::IP $val;
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| 115 | if (!$tmpzone->contains($ipval)) {
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| 116 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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| 117 | next;
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| 118 | }
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| 119 | } # is $val a raw .arpa name?
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| 120 |
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| 121 | # Spaces are evil.
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| 122 | $val =~ s/^\s+//;
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| 123 | $val =~ s/\s+$//;
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| 124 | if ($typemap{$type} ne 'TXT') {
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| 125 | # Leading or trailng spaces could be legit in TXT records.
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| 126 | $host =~ s/^\s+//;
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| 127 | $host =~ s/\s+$//;
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| 128 | }
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| 129 |
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| 130 | printrec_bind($zonefilehandle, $recid, 'y', \%recflags, $revzone,
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| 131 | $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive);
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| 132 |
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| 133 | $recflags{$recid} = 1;
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| 134 |
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| 135 | } # while ($recsth)
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| 136 |
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| 137 | if ($self->{usecache}) {
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| 138 | close ZONECACHE; # force the file to be written
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| 139 | # catch obvious write errors that leave an empty temp file
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| 140 | if (-s $tmpcache) {
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| 141 | rename $tmpcache, $cachefile
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| 142 | or die "Error overwriting cache file $cachefile with temporary file: $!\n";
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| 143 | }
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| 144 | }
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| 145 |
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| 146 | } # if $changed or cache filesize is 0
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| 147 |
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| 148 | };
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| 149 | if ($@) {
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| 150 | die "error writing ".($self->{usecache} ? 'new data for ' : '')."$revzone: $@\n";
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| 151 | # error! something borked, and we should be able to fall back on the old cache file
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| 152 | # report the error, somehow.
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| 153 | } else {
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| 154 | # mark zone as unmodified. Only do this if no errors, that way
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| 155 | # export failures should recover a little more automatically.
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| 156 | $zonesth->execute($revid);
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| 157 | }
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| 158 |
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| 159 | # if ($self->{usecache}) {
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| 160 | # # We've already made as sure as we can that a cached zone file is "good",
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| 161 | # # although possibly stale/obsolete due to errors creating a new one.
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| 162 | # eval {
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| 163 | # open CACHE, "<$cachefile" or die $!;
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| 164 | # print $datafile $_ or die "error copying cached $revzone to master file: $!" while <CACHE>;
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| 165 | # close CACHE;
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| 166 | # };
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| 167 | # die $@ if $@;
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| 168 | # }
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| 169 |
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| 170 |
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| 171 |
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| 172 | } # revsth->fetch
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| 173 |
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| 174 |
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| 175 | # Write the view configuration last, because otherwise we have to be horribly inefficient
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| 176 | # at figuring out which zones are visible/present in which views
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| 177 | if ($viewlist) {
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| 178 | foreach my $view (@{$viewlist}) {
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| 179 | #print Dumper($view);
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| 180 | # print BINDCONF "view $view->{location} {\n";
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| 181 | print "view $view->{location} {\n";
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| 182 | # could also use an acl { ... }; statement, then match-clients { aclname; };, but that gets hairy
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| 183 | # note that some semantics of data visibility need to be handled by the record export, since it's
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| 184 | # not 100% clear if the semantics of a tinydns view with an empty IP list (matches anyone) are the
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| 185 | # same as a BIND view with match-clients { any; };
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| 186 | if ($view->{iplist}) {
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| 187 | # print BINDCONF " match-clients { ".join("; ", $view->iplist)."; };\n";
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| 188 | print " match-clients { ".join("; ", split(/[\s,]+/, $view->{iplist}))."; };\n";
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| 189 | } else {
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| 190 | # print BINDCONF " match-clients { any; };\n";
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| 191 | print " match-clients { any; };\n";
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| 192 | }
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| 193 | foreach my $zone (@{$viewzones{$view->{location}}}) {
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| 194 | ##fixme: notify settings, maybe per-zone?
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| 195 | print qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n);
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| 196 | }
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| 197 | print "};\n\n";
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| 198 | } # foreach @$viewlist
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| 199 | } # if $viewlist
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| 200 |
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| 201 | } # export()
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| 202 |
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| 203 |
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| 204 | # Print individual records in BIND format
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| 205 | sub printrec_bind {
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| 206 | my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl,
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| 207 | $recloc, $stamp, $expires, $stampactive) = @_;
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| 208 |
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| 209 | # Just In Case something is lingering in the DB
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| 210 | $recloc = '' if !$loc;
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| 211 |
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| 212 | ## And now to the records!
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| 213 |
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| 214 | if ($typemap{$type} eq 'SOA') {
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| 215 | # host contains pri-ns:responsible
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| 216 | # val is abused to contain refresh:retry:expire:minttl
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| 217 | # let's be explicit about abusing $host and $val
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| 218 | my ($email, $primary) = (split /:/, $host)[0,1];
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| 219 | my ($refresh, $retry, $expire, $min_ttl) = (split /:/, $val)[0,1,2,3];
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| 220 | my $serial = 0; # fail less horribly than leaving it empty?
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| 221 | if ($revrec eq 'y') {
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| 222 | ##fixme: have to publish SOA records for each v4 /24 in sub-/16, and each /16 in sub-/8
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| 223 | # what about v6?
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| 224 | # -> only need SOA for local chunks offset from reverse delegation boundaries, so v6 is fine
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| 225 | # anyone who says they need sub-nibble v6 delegations, at this time, needs their head examined.
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| 226 | ##fixme?: alternate SOA serial schemes?
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| 227 | ($serial) = $self->{dbh}->selectrow_array("SELECT zserial FROM revzones WHERE revnet=?", undef, $zone);
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| 228 | $zone = NetAddr::IP->new($zone);
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| 229 | # handle split-n-multiply SOA for off-octet (8 < mask < 16) or (16 < mask < 24) v4 zones
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| 230 | if (!$zone->{isv6} && ($zone->masklen < 24) && ($zone->masklen % 8 != 0)) {
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| 231 | foreach my $szone ($zone->split($zone->masklen + (8 - $zone->masklen % 8))) {
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| 232 | $szone = _ZONE($szone, 'ZONE.in-addr.arpa', 'r', '.');
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| 233 | print $datafile "Z$szone:$primary:$email:$serial:$refresh:$retry:$expire:$min_ttl:$ttl:$stamp:$loc\n"
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| 234 | or die $!;
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| 235 | }
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| 236 | return; # skips "default" bits just below
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| 237 | }
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| 238 | $zone = _ZONE($zone, 'ZONE', 'r', '.').($zone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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| 239 | } else {
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| 240 | # just snarfing the right SOA serial for the zone type
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| 241 | ##fixme?: alternate SOA serial schemes?
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| 242 | ($serial) = $self->{dbh}->selectrow_array("SELECT zserial FROM domains WHERE domain=?", undef, $zone);
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| 243 | } # revrec <> 'y'
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| 244 | # suppress a "uninitialized value" warning. should be impossible but...
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| 245 | # abuse hours as the last digit pair of the serial for simplicity
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| 246 | $serial = strftime("%Y%m%d%H", localtime()) if !$serial;
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| 247 | print $zonefiles{$recloc} "Z$zone:$primary:$email:$serial:$refresh:$retry:$expire:$min_ttl:$ttl:$stamp:$loc\n"
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| 248 | or die $!;
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| 249 | } # SOA
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| 250 |
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| 251 | } # printrec_bind()
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| 252 |
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| 253 |
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| 254 | 1;
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