| 1 | # dns/trunk/DNSDB/ExportBIND.pm
|
|---|
| 2 | # BIND data export/publication
|
|---|
| 3 | # Call through DNSDB.pm's export() sub
|
|---|
| 4 | ##
|
|---|
| 5 | # $Id: ExportBIND.pm 853 2022-09-15 19:46:07Z kdeugau $
|
|---|
| 6 | # Copyright 2022 Kris Deugau <kdeugau@deepnet.cx>
|
|---|
| 7 | #
|
|---|
| 8 | # This program is free software: you can redistribute it and/or modify
|
|---|
| 9 | # it under the terms of the GNU General Public License as published by
|
|---|
| 10 | # the Free Software Foundation, either version 3 of the License, or
|
|---|
| 11 | # (at your option) any later version.
|
|---|
| 12 | #
|
|---|
| 13 | # This program is distributed in the hope that it will be useful,
|
|---|
| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 16 | # GNU General Public License for more details.
|
|---|
| 17 | #
|
|---|
| 18 | # You should have received a copy of the GNU General Public License
|
|---|
| 19 | # along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|---|
| 20 | ##
|
|---|
| 21 |
|
|---|
| 22 | package DNSDB::ExportBIND;
|
|---|
| 23 |
|
|---|
| 24 | use strict;
|
|---|
| 25 | use warnings;
|
|---|
| 26 |
|
|---|
| 27 | sub export {
|
|---|
| 28 | # expected to be a DNSDB object
|
|---|
| 29 | my $self = shift;
|
|---|
| 30 | my $dbh = $self->{dbh};
|
|---|
| 31 |
|
|---|
| 32 | # to be a hash of views/locations, containing lists of zones
|
|---|
| 33 | my %viewzones;
|
|---|
| 34 |
|
|---|
| 35 | # allow for future exports of subgroups of records
|
|---|
| 36 | my $viewlist = $self->getLocList(curgroup => 1);
|
|---|
| 37 |
|
|---|
| 38 | my $soasth = $dbh->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location ".
|
|---|
| 39 | "FROM records WHERE rdns_id=? AND type=6");
|
|---|
| 40 | my $recsth = $dbh->prepare("SELECT host,type,val,distance,weight,port,ttl,record_id,location,extract(epoch from stamp),expires,stampactive ".
|
|---|
| 41 | "FROM records WHERE rdns_id=? AND NOT type=6 ".
|
|---|
| 42 | "ORDER BY masklen(inetlazy(val)) DESC, inetlazy(val)");
|
|---|
| 43 |
|
|---|
| 44 | # Fetch active zone list
|
|---|
| 45 | my $revsth = $self->{dbh}->prepare("SELECT rdns_id,revnet,status,changed,default_location FROM revzones WHERE status=1 ".
|
|---|
| 46 | "ORDER BY masklen(revnet) DESC, rdns_id");
|
|---|
| 47 | # Unflag changed zones, so we can maybe cache the export and not redo everything every time
|
|---|
| 48 | my $zonesth = $self->{dbh}->prepare("UPDATE revzones SET changed='n' WHERE rdns_id=?");
|
|---|
| 49 | $revsth->execute();
|
|---|
| 50 | while (my ($revid,$revzone,$revstat,$changed,$defloc) = $revsth->fetchrow_array) {
|
|---|
| 51 | my $tmpzone = NetAddr::IP->new($revzone);
|
|---|
| 52 | my $zfile = $tmpzone->network->addr."-".$tmpzone->masklen;
|
|---|
| 53 | # my $cachefile = "$self->{exportcache}/$zfile";
|
|---|
| 54 | # my $tmpcache = "$self->{exportcache}/tmp.$zfile.$$";
|
|---|
| 55 | my $tmpcache = "tmp.$zfile.$$"; # safety net. don't overwrite a previous known-good file
|
|---|
| 56 |
|
|---|
| 57 | ##fixme: convert logical revzone into .arpa name? maybe take a slice of showrev_arpa?
|
|---|
| 58 | ##fixme: need to bodge logical non-octet-boundary revzones into octet-boundary revzones
|
|---|
| 59 | ##fixme: do we do cache files? views balloon the file count stupidly
|
|---|
| 60 |
|
|---|
| 61 |
|
|---|
| 62 | eval {
|
|---|
| 63 |
|
|---|
| 64 | # write fresh records if:
|
|---|
| 65 | # - we are not using the cache
|
|---|
| 66 | # - force_refresh is set
|
|---|
| 67 | # - the zone has changed
|
|---|
| 68 | # - the cache file does not exist
|
|---|
| 69 | # - the cache file is empty
|
|---|
| 70 | if (!$self->{usecache} || $self->{force_refresh} || $changed || !-e $cachefile || -z $cachefile) {
|
|---|
| 71 | if ($self->{usecache}) {
|
|---|
| 72 | open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n";
|
|---|
| 73 | $zonefilehandle = *ZONECACHE;
|
|---|
| 74 | }
|
|---|
| 75 |
|
|---|
| 76 | # fetch a list of views/locations present in the zone. we need to publish a file for each one.
|
|---|
| 77 | # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path
|
|---|
| 78 | my (@loclist) = $self->{dbh}->selectrow_array("SELECT DISTINCT location FROM records WHERE rdns_id = ?", undef, $revid);
|
|---|
| 79 | push @loclist, $defloc unless grep /$defloc/, @loclist;
|
|---|
| 80 | my $zonepath = $self->{bind_export_zone_path};
|
|---|
| 81 | my %zonefiles; # to be a list of file handles.
|
|---|
| 82 | ##fixme: convert logical revzone into .arpa name
|
|---|
| 83 | foreach my $loc (@loclist) {
|
|---|
| 84 | my $zfilepath = $zonepath;
|
|---|
| 85 | $zfilepath =~ s/\%view/$loc/;
|
|---|
| 86 | $zfilepath =~ s/\%zone/$revzone/;
|
|---|
| 87 | # Just In Case(TM)
|
|---|
| 88 | $zfilepath =~ s,[^\w./-],_,g;
|
|---|
| 89 | #open $zonefiles{$loc}, ">", $zfilepath;
|
|---|
| 90 | print "open zonefile for '$loc', '$zfilepath'\n";
|
|---|
| 91 | }
|
|---|
| 92 |
|
|---|
| 93 |
|
|---|
| 94 | # need to fetch this separately since the rest of the records all (should) have real IPs in val
|
|---|
| 95 | $soasth->execute($revid);
|
|---|
| 96 | my (@zsoa) = $soasth->fetchrow_array();
|
|---|
| 97 | $self->_printrec_tiny($zonefilehandle, $zsoa[7], 'y',\%recflags,$revzone,
|
|---|
| 98 | $zsoa[0],$zsoa[1],$zsoa[2],$zsoa[3],$zsoa[4],$zsoa[5],$zsoa[6],$zsoa[8],'');
|
|---|
| 99 |
|
|---|
| 100 | $recsth->execute($revid);
|
|---|
| 101 | my $fullzone = _ZONE($tmpzone, 'ZONE', 'r', '.').($tmpzone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
|
|---|
| 102 |
|
|---|
| 103 | while (my ($host, $type, $val, $dist, $weight, $port, $ttl, $recid, $loc, $stamp, $expires, $stampactive)
|
|---|
| 104 | = $recsth->fetchrow_array) {
|
|---|
| 105 | next if $recflags{$recid};
|
|---|
| 106 |
|
|---|
| 107 | # Check for out-of-zone data
|
|---|
| 108 | if ($val =~ /\.arpa$/) {
|
|---|
| 109 | # val is non-IP
|
|---|
| 110 | if ($val !~ /$fullzone$/) {
|
|---|
| 111 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
|
|---|
| 112 | next;
|
|---|
| 113 | }
|
|---|
| 114 | } else {
|
|---|
| 115 | my $ipval = new NetAddr::IP $val;
|
|---|
| 116 | if (!$tmpzone->contains($ipval)) {
|
|---|
| 117 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
|
|---|
| 118 | next;
|
|---|
| 119 | }
|
|---|
| 120 | } # is $val a raw .arpa name?
|
|---|
| 121 |
|
|---|
| 122 | # Spaces are evil.
|
|---|
| 123 | $val =~ s/^\s+//;
|
|---|
| 124 | $val =~ s/\s+$//;
|
|---|
| 125 | if ($typemap{$type} ne 'TXT') {
|
|---|
| 126 | # Leading or trailng spaces could be legit in TXT records.
|
|---|
| 127 | $host =~ s/^\s+//;
|
|---|
| 128 | $host =~ s/\s+$//;
|
|---|
| 129 | }
|
|---|
| 130 |
|
|---|
| 131 | $self->_printrec_tiny($zonefilehandle, $recid, 'y', \%recflags, $revzone,
|
|---|
| 132 | $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive);
|
|---|
| 133 |
|
|---|
| 134 | $recflags{$recid} = 1;
|
|---|
| 135 |
|
|---|
| 136 | } # while ($recsth)
|
|---|
| 137 |
|
|---|
| 138 | if ($self->{usecache}) {
|
|---|
| 139 | close ZONECACHE; # force the file to be written
|
|---|
| 140 | # catch obvious write errors that leave an empty temp file
|
|---|
| 141 | if (-s $tmpcache) {
|
|---|
| 142 | rename $tmpcache, $cachefile
|
|---|
| 143 | or die "Error overwriting cache file $cachefile with temporary file: $!\n";
|
|---|
| 144 | }
|
|---|
| 145 | }
|
|---|
| 146 |
|
|---|
| 147 | } # if $changed or cache filesize is 0
|
|---|
| 148 |
|
|---|
| 149 | };
|
|---|
| 150 | if ($@) {
|
|---|
| 151 | die "error writing ".($self->{usecache} ? 'new data for ' : '')."$revzone: $@\n";
|
|---|
| 152 | # error! something borked, and we should be able to fall back on the old cache file
|
|---|
| 153 | # report the error, somehow.
|
|---|
| 154 | } else {
|
|---|
| 155 | # mark zone as unmodified. Only do this if no errors, that way
|
|---|
| 156 | # export failures should recover a little more automatically.
|
|---|
| 157 | $zonesth->execute($revid);
|
|---|
| 158 | }
|
|---|
| 159 |
|
|---|
| 160 | # if ($self->{usecache}) {
|
|---|
| 161 | # # We've already made as sure as we can that a cached zone file is "good",
|
|---|
| 162 | # # although possibly stale/obsolete due to errors creating a new one.
|
|---|
| 163 | # eval {
|
|---|
| 164 | # open CACHE, "<$cachefile" or die $!;
|
|---|
| 165 | # print $datafile $_ or die "error copying cached $revzone to master file: $!" while <CACHE>;
|
|---|
| 166 | # close CACHE;
|
|---|
| 167 | # };
|
|---|
| 168 | # die $@ if $@;
|
|---|
| 169 | # }
|
|---|
| 170 |
|
|---|
| 171 |
|
|---|
| 172 |
|
|---|
| 173 | $soasth->execute($revid);
|
|---|
| 174 | my (@zsoa) = $soasth->fetchrow_array();
|
|---|
| 175 |
|
|---|
| 176 | } # revsth->fetch
|
|---|
| 177 |
|
|---|
| 178 |
|
|---|
| 179 | # Write the view configuration last, because otherwise we have to be horribly inefficient
|
|---|
| 180 | # at figuring out which zones are visible/present in which views
|
|---|
| 181 | if ($viewlist) {
|
|---|
| 182 | foreach my $view (@{$viewlist}) {
|
|---|
| 183 | #print Dumper($view);
|
|---|
| 184 | # print BINDCONF "view $view->{location} {\n";
|
|---|
| 185 | print "view $view->{location} {\n";
|
|---|
| 186 | # could also use an acl { ... }; statement, then match-clients { aclname; };, but that gets hairy
|
|---|
| 187 | # note that some semantics of data visibility need to be handled by the record export, since it's
|
|---|
| 188 | # not 100% clear if the semantics of a tinydns view with an empty IP list (matches anyone) are the
|
|---|
| 189 | # same as a BIND view with match-clients { any; };
|
|---|
| 190 | if ($view->{iplist}) {
|
|---|
| 191 | # print BINDCONF " match-clients { ".join("; ", $view->iplist)."; };\n";
|
|---|
| 192 | print " match-clients { ".join("; ", split(/[\s,]+/, $view->{iplist}))."; };\n";
|
|---|
| 193 | } else {
|
|---|
| 194 | # print BINDCONF " match-clients { any; };\n";
|
|---|
| 195 | print " match-clients { any; };\n";
|
|---|
| 196 | }
|
|---|
| 197 | foreach my $zone (@{$viewzones{$view->{location}}}) {
|
|---|
| 198 | ##fixme: notify settings, maybe per-zone?
|
|---|
| 199 | print qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n);
|
|---|
| 200 | }
|
|---|
| 201 | print "};\n\n";
|
|---|
| 202 | } # foreach @$viewlist
|
|---|
| 203 | } # if $viewlist
|
|---|
| 204 |
|
|---|
| 205 | } # export()
|
|---|
| 206 |
|
|---|
| 207 | 1;
|
|---|
![[ DNS Administrator ]](/fx/dnsadmin-logo.png){kind=logo}
