# dns/trunk/DNSDB/ExportBIND.pm # BIND data export/publication # Call through DNSDB.pm's export() sub ## # $Id: ExportBIND.pm 882 2023-01-24 23:04:42Z kdeugau $ # Copyright 2022,2023 Kris Deugau # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . ## package DNSDB::ExportBIND; use strict; use warnings; use DNSDB; sub export { # expected to be a DNSDB object my $dnsdb = shift; # to be a hash of views/locations, containing lists of zones my %viewzones; # allow for future exports of subgroups of records my $viewlist = $dnsdb->getLocList(curgroup => 1, full => 1); ## export reverse zones my $soasth = $dnsdb->{dbh}->prepare("SELECT host,val,ttl,record_id,location FROM records WHERE rdns_id=? AND type=6"); # record order matters for reverse zones because we need to override larger templates with smaller ones. my $recsth = $dnsdb->{dbh}->prepare( "SELECT host,type,val,distance,weight,port,ttl,record_id,location,extract(epoch from stamp),expires,stampactive ". "FROM records WHERE rdns_id=? AND NOT type=6 ". "ORDER BY masklen(inetlazy(val)) DESC, inetlazy(val), record_id"); # Fetch active zone list my $revsth = $dnsdb->{dbh}->prepare("SELECT rdns_id,revnet,status,changed,default_location FROM revzones WHERE status=1 ". "ORDER BY masklen(revnet),revnet DESC, rdns_id"); # Unflag changed zones, so we can maybe cache the export and not redo everything every time my $zonesth = $dnsdb->{dbh}->prepare("UPDATE revzones SET changed='n' WHERE rdns_id=?"); my %recflags; # need this to be independent for forward vs reverse zones, as they're not merged $revsth->execute(); while (my ($revid,$revzone,$revstat,$changed,$defloc) = $revsth->fetchrow_array) { my $cidr = NetAddr::IP->new($revzone); ##fixme: convert logical revzone into .arpa name? maybe take a slice of showrev_arpa? ##fixme: need to bodge logical non-octet-boundary revzones into octet-boundary revzones ##fixme: do we do cache files? views balloon the file count stupidly ## foreach $octetzone $cidr->split(octet-boundary) ## loclist = SELECT DISTINCT location FROM records WHERE rdns_id = $zid AND inetlazy(val) <<= $octetzone #printf "non-octet? %s, %i\n", $cidr->masklen, $cidr->masklen % 8; # fetch a list of views/locations present in the zone. we need to publish a file for each one. # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path my $tmplocs = $dnsdb->{dbh}->selectall_arrayref("SELECT DISTINCT location FROM records WHERE rdns_id = ?", undef, $revid); my @loclist; foreach my $tloc (@{$tmplocs}) { push @loclist, ($tloc->[0] eq '' ? 'common' : $tloc->[0]); } my %zonefiles; # zone file handles eval { ##fixme: use tmpfile module for more secure temp files? want the zone name at least in it anyway, not sure that works... my $arpazone = DNSDB::_ZONE($cidr, 'ZONE', 'r', '.').($cidr->{isv6} ? '.ip6.arpa' : '.in-addr.arpa'); my $zfile = $cidr->network->addr."-".$cidr->masklen; # my $cachefile = "$dnsdb->{exportcache}/$zfile"; # my $tmpcache = "$dnsdb->{exportcache}/tmp.$zfile.$$"; my $tmpcache = "tmp.$zfile.$$"; # safety net. don't overwrite a previous known-good file ##fixme: need to open separate zone files for aggregated metazones eg /22 or /14 foreach my $loc (@loclist) { my $zfilepath = $dnsdb->{bind_export_reverse_zone_path}; $zfilepath =~ s/\%view/$loc/; $zfilepath =~ s/\%zone/$zfile/; $zfilepath =~ s/\%arpazone/$arpazone/; # Just In Case(TM) $zfilepath =~ s,[^\w./-],_,g; # safety check, may need tweaking for race conditions my $zpathbase = $zfilepath; $zpathbase =~ s{/[^/]+$}{}; if (!-e $zpathbase) { mkdir $zpathbase; } else { die "$zpathbase is not a directory\n" unless -d $zpathbase; } # write fresh records if: # - the zone contains records which expire in less than 10 minutes or became valid less than 10 minutes ago # note, no need to multi-bump the serial if ( ($dnsdb->{dbh}->selectrow_array("SELECT COUNT(*) FROM records WHERE rdns_id = ? AND ". "stampactive='t' AND @(extract(epoch from stamp-now())) < 600", undef, $revid))[0] ) { $changed = 1; $dnsdb->_updateserial(rdns_id => $revid); } # - we are not using the cache # if ($dnsdb->{usecache} # - force_refresh is set # - the zone has changed # - the zone file does not exist # - the zone file is empty elsif ($dnsdb->{force_refresh} || $changed || !-e $zfilepath || -z $zfilepath) { # if ($dnsdb->{usecache}) { # open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n"; # $zonefilehandle = *ZONECACHE; # } open $zonefiles{$loc}, ">", $zfilepath or die "Error creating temporary file $zfilepath: $!\n"; # Header for human convenience ##fixme? vary arpazone/cidr in header and error message per showrev_arpa, or possibly # new dedicated setting, or possibly interact with with bind_export_fqdn? printf {$zonefiles{$loc}} "; %s in view %s exported %s\n", $arpazone, $loc, scalar(localtime) or die "Error writing header [$arpazone, '$loc']: $!\n"; # Fetch the SOA separately as we publish it separately for each location with this loop, # mainly because we want it first in the zone file $soasth->execute($revid); my ($soa_host, $soa_val, $soa_ttl, $soa_id, $soa_loc) = $soasth->fetchrow_array; ##fixme: do we even need @loclist passed in? printrec_bind($dnsdb, \%zonefiles, \@loclist, $soa_id, 'y', \%recflags, $cidr, $soa_host, 6, $soa_val, 0, 0, 0, $soa_ttl, $loc, ''); } # if force_refresh etc # tag the zonefile for publication in the view push @{$viewzones{$loc}}, $arpazone; } # foreach @loclist # now the meat of the records $recsth->execute($revid); while (my ($host, $type, $val, $dist, $weight, $port, $ttl, $recid, $loc, $stamp, $expires, $stampactive) = $recsth->fetchrow_array) { next if $recflags{$recid}; # Spaces are evil. $val =~ s/^\s+//; $val =~ s/\s+$//; if ($typemap{$type} ne 'TXT') { # Leading or trailng spaces could be legit in TXT records. $host =~ s/^\s+//; $host =~ s/\s+$//; } # Check for out-of-zone data if ($val =~ /\.arpa$/) { # val is non-IP if ($val !~ /$arpazone$/) { warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $cidr)\n"; next; } } else { my $ipval = new NetAddr::IP $val; if (!$cidr->contains($ipval)) { warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $cidr)\n"; next; } } # is $val a raw .arpa name? printrec_bind($dnsdb, \%zonefiles, \@loclist, $recid, 'y', \%recflags, $revzone, $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive); $recflags{$recid} = 1; } # while ($recsth) # if ($dnsdb->{usecache}) { # close ZONECACHE; # force the file to be written # # catch obvious write errors that leave an empty temp file # if (-s $tmpcache) { # rename $tmpcache, $cachefile # or die "Error overwriting cache file $cachefile with temporary file: $!\n"; # } # } }; if ($@) { die "error writing ".($dnsdb->{usecache} ? 'new data for ' : '')."$revzone: $@\n"; # error! something borked, and we should be able to fall back on the old cache file # report the error, somehow. } else { # mark zone as unmodified. Only do this if no errors, that way # export failures should recover a little more automatically. $zonesth->execute($revid); } # if ($dnsdb->{usecache}) { # # We've already made as sure as we can that a cached zone file is "good", # # although possibly stale/obsolete due to errors creating a new one. # eval { # open CACHE, "<$cachefile" or die $!; # print $datafile $_ or die "error copying cached $revzone to master file: $!" while ; # close CACHE; # }; # die $@ if $@; # } } # revsth->fetch ## and now the domains $soasth = $dnsdb->{dbh}->prepare("SELECT host,val,ttl,record_id,location FROM records WHERE domain_id=? AND type=6"); # record order needs to match reverse zone ordering for IP values, or A+PTR # template records don't cascade/expand correctly to match the reverse zones. # order by record_id at least makes the zone consistent from export to export, # otherwise the records could (theoretically) be returned in any old order by # the DB engine # ordering by nominal parent-child label hierarchy (as actually found live # in some AXFRed zone files) would take a lot of chewing on data $recsth = $dnsdb->{dbh}->prepare( "SELECT host,type,val,distance,weight,port,ttl,record_id,location,extract(epoch from stamp),expires,stampactive ". "FROM records WHERE domain_id=? AND NOT type=6 ". "ORDER BY masklen(inetlazy(val)) DESC, inetlazy(val), record_id"); # "FROM records WHERE domain_id=? AND type < 65280"); # Just exclude all types relating to rDNS # Fetch active zone list my $domsth = $dnsdb->{dbh}->prepare("SELECT domain_id,domain,status,changed,default_location FROM domains WHERE status=1 ". "ORDER BY domain_id"); # Unflag changed zones, so we can maybe cache the export and not redo everything every time $zonesth = $dnsdb->{dbh}->prepare("UPDATE domains SET changed='n' WHERE domain_id=?"); # Clear %reclfags, since we explicitly want to NOT carry "I've published this # record" over from rDNS, since we have to regenerate any templates for forward # zones. downside: small mismatches due to overridden entries. not sure how # best to manage that. :/ ##fixme: selectively delete entries to allow template_always_publish_a to flag # whether extra A records get published or not. should default to not (nb, of # *course* that's the complex case) to match original tinydns template masking behaviour # %recflags = (); $domsth->execute(); while (my ($domid,$domain,$domstat,$changed) = $domsth->fetchrow_array) { # fetch a list of views/locations present in the zone. we need to publish a file for each one. # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path my $tmplocs = $dnsdb->{dbh}->selectall_arrayref("SELECT DISTINCT location FROM records WHERE domain_id = ?", undef, $domid); my @loclist; foreach my $tloc (@{$tmplocs}) { push @loclist, ($tloc->[0] eq '' ? 'common' : $tloc->[0]); } my %zonefiles; # zone file handles eval { ##fixme: use tmpfile module for more secure temp files? want the zone name at least in it anyway, not sure that works... my $zfile = $domain; # can probably drop this intermediate my $tmpcache = "tmp.$zfile.$$"; # safety net. don't overwrite a previous known-good file foreach my $loc (@loclist) { my $zfilepath = $dnsdb->{bind_export_zone_path}; $zfilepath =~ s/\%view/$loc/; $zfilepath =~ s/\%zone/$zfile/; # Just In Case(TM) $zfilepath =~ s,[^\w./-],_,g; # safety check, may need tweaking for race conditions my $zpathbase = $zfilepath; $zpathbase =~ s{/[^/]+$}{}; if (!-e $zpathbase) { mkdir $zpathbase; } else { die "$zpathbase is not a directory\n" unless -d $zpathbase; } # write fresh records if: # - the zone contains ALIAS pseudorecords, which need to cascade changes from the upstream CNAME farm at every opportunity if ( ($dnsdb->{dbh}->selectrow_array("SELECT count(*) FROM records WHERE domain_id = ? AND type=65300", undef, $domid))[0] ) { $changed = 1; # abuse this flag for zones with ALIAS records # also update the serial number, because while it shouldn't matter purely for serving # records, it WILL matter if AXFR becomes part of the publishing infrastructure $dnsdb->_updateserial(domain_id => $domid); } # - the zone contains records which expire in less than 10 minutes or became valid less than 10 minutes ago # note, no need to multi-bump the serial elsif ( ($dnsdb->{dbh}->selectrow_array("SELECT COUNT(*) FROM records WHERE domain_id = ? AND ". "stampactive='t' AND @(extract(epoch from stamp-now())) < 600", undef, $domid))[0] ) { $changed = 1; $dnsdb->_updateserial(domain_id => $domid); } # - we are not using the cache # if ($dnsdb->{usecache} # - force_refresh is set # - the zone has changed # - the zone file does not exist # - the zone file is empty # if (!$self->{usecache} || $self->{force_refresh} || $changed || !-e $cachefile || -z $cachefile) { if ($dnsdb->{force_refresh} || $changed || !-e $zfilepath || -z $zfilepath) { # if ($self->{usecache}) { # open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n"; # $zonefilehandle = *ZONECACHE; # } open $zonefiles{$loc}, ">", $zfilepath or die "Error creating temporary file $zfilepath: $!\n"; # Header for human convenience printf {$zonefiles{$loc}} "; %s in view %s exported %s\n", $domain, $loc, scalar(localtime) or die "Error writing header [$domain, '$loc']: $!\n"; # Fetch the SOA separately as we publish it separately for each location with this loop, # mainly because we want it first in the zone file $soasth->execute($domid); my ($soa_host, $soa_val, $soa_ttl, $soa_id, $soa_loc) = $soasth->fetchrow_array; ##fixme: do we even need @loclist passed in? printrec_bind($dnsdb, \%zonefiles, \@loclist, $soa_id, 'n', \%recflags, $domain, $soa_host, 6, $soa_val, 0, 0, 0, $soa_ttl, $loc, ''); } # if force_refresh etc # tag the zonefile for publication in the view push @{$viewzones{$loc}}, $domain; } # foreach @loclist # now the meat of the records $recsth->execute($domid); while (my ($host,$type,$val,$dist,$weight,$port,$ttl,$recid,$loc,$stamp,$expires,$stampactive) = $recsth->fetchrow_array) { ##work need more subtle check - $recflags{$val} eq 'ptr' maybe? next if $recflags{$recid}; #next if $recflags{$val} && $type == 65280;# && !$dnsdb->{template_always_publish_a}; # Spaces are evil. $host =~ s/^\s+//; $host =~ s/\s+$//; if ($typemap{$type} ne 'TXT') { # Leading or trailng spaces could be legit in TXT records. $val =~ s/^\s+//; $val =~ s/\s+$//; } # Check for out-of-zone data $host = $domain if $host eq '@'; if ($host !~ /$domain$/i) { warn "Not exporting out-of-zone record $host $type $val, $ttl (zone $domain)\n"; next; } printrec_bind($dnsdb, \%zonefiles, \@loclist, $recid, 'n', \%recflags, $domain, $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive); $recflags{$recid} = 1; } # while ($recsth) # retrieve NS records for subdomains. not strictly required in current production # context but may matter sometime down the road my $subnssth = $dnsdb->{dbh}->prepare("SELECT r.host,r.val,r.ttl,r.record_id,r.loc,r.stamp,r.expires,r.stampactive ". "FROM records r ". "JOIN domains d ON r.domain_id=d.domain_id ". "WHERE r.type=2 AND d.domain LIKE ?"); $subnssth->execute('%.'.$domain); while (my ($host,$val,$ttl,$recid,$loc,$stamp,$expires,$stampactive) = $subnssth->fetchrow_array) { printrec_bind($dnsdb, \%zonefiles, \@loclist, $recid, 'n', \%recflags, $domain, $host, 2, $val, '', '', '', $ttl, $loc, $stamp, $expires, $stampactive); } # subdomain-ns-recsth # if ($self->{usecache}) { # close ZONECACHE; # force the file to be written # # catch obvious write errors that leave an empty temp file # if (-s $tmpcache) { # rename $tmpcache, $cachefile # or die "Error overwriting cache file $cachefile with temporary file: $!\n"; # } # } # } # if $changed or cache filesize is 0 }; if ($@) { die "error writing ".($dnsdb->{usecache} ? 'new data for ' : '')."$domain: $@\n"; # error! something borked, and we should be able to fall back on the old cache file # report the error, somehow. } else { # mark zone as unmodified. Only do this if no errors, that way # export failures should recover a little more automatically. $zonesth->execute($domid); } # if ($dnsdb->{usecache}) { # # We've already made as sure as we can that a cached zone file is "good", # # although possibly stale/obsolete due to errors creating a new one. # eval { # open CACHE, "<$cachefile" or die $!; # print $datafile $_ or die "error copying cached $revzone to master file: $!" while ; # close CACHE; # }; # die $@ if $@; # } } # domsth->fetch # Write the view configuration last, because otherwise we have to be horribly inefficient # at figuring out which zones are visible/present in which views if ($viewlist) { my $tmpconf = "$dnsdb->{bind_zone_conf}.$$"; ##fixme: split filename for prefixing open BINDCONF, ">", $tmpconf; foreach my $view (@{$viewlist}, { location => 'common', iplist => '' }) { #print Dumper($view); print BINDCONF "view $view->{location} {\n"; # print "view $view->{location} {\n"; # could also use an acl { ... }; statement, then match-clients { aclname; };, but that gets hairy # note that some semantics of data visibility need to be handled by the record export, since it's # not 100% clear if the semantics of a tinydns view with an empty IP list (matches anyone) are the # same as a BIND view with match-clients { any; }; if ($view->{iplist}) { print BINDCONF " match-clients { ".join("; ", $view->{iplist})."; };\n"; # print " match-clients { ".join("; ", split(/[\s,]+/, $view->{iplist}))."; };\n"; } else { print BINDCONF " match-clients { any; };\n"; # print " match-clients { any; };\n"; } foreach my $zone (@{$viewzones{$view->{location}}}) { ##fixme: notify settings, maybe per-zone? print BINDCONF qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n); # print qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n); } print BINDCONF "};\n\n"; # print "};\n\n"; } # foreach @$viewlist rename $tmpconf, $dnsdb->{bind_zone_conf}; } # if $viewlist } # export() # Print individual records in BIND format sub printrec_bind { my $dnsdb = shift; # my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl, my ($zonefiles, $loclist, $recid, $revrec, $recflags, $zone, $host, $type, $val, $distance, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive) = @_; # Just In Case something is lingering in the DB $loc = '' if !$loc; ## And now to the records! if ($typemap{$type} eq 'SOA') { # host contains pri-ns:responsible # val is abused to contain refresh:retry:expire:minttl # let's be explicit about abusing $host and $val my ($email, $primary) = (split /:/, $host)[0,1]; my ($refresh, $retry, $expire, $min_ttl) = (split /:/, $val)[0,1,2,3]; my $serial = 0; # fail less horribly than leaving it empty? # just snarfing the right SOA serial for the zone type if ($revrec eq 'y') { ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM revzones WHERE revnet=?", undef, $zone); } else { ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM domains WHERE domain=?", undef, $zone); } # revrec <> 'y' # suppress a "uninitialized value" warning. should be impossible but... # abuse hours as the last digit pair of the serial for simplicity ##fixme?: alternate SOA serial schemes? $serial = strftime("%Y%m%d%H", localtime()) if !$serial; $primary .= "." if $primary !~ /\.$/; $email .= "." if $email !~ /\.$/; # print *{$zonefiles->{$loc}} "Z$zone:$primary:$email:$serial:$refresh:$retry:$expire:$min_ttl:$ttl:$stamp:$loc\n" # or die $!; # print *{$zonefiles->{$loc}} "$zone $ttl IN SOA $primary $email ( $serial $refresh $retry $expire $min_ttl )\n" # or die "couldn't write $zone SOA: $!"; # Prepare the body of the record my $recdata = "$ttl IN SOA $primary $email ( $serial $refresh $retry $expire $min_ttl )\n"; # ... and prepend the zone name FQDN if ($revrec eq 'y') { my $zone2 = DNSDB::_ZONE($zone, 'ZONE', 'r', '.').($zone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa'); $recdata = "$zone2. $recdata"; } else { $recdata = "$zone. $recdata"; } __recprint($zonefiles, $loclist, $loc, $recdata); } # SOA elsif ($typemap{$type} eq 'A') { ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print $datafile "+$host:$val:$ttl:$stamp:$loc\n" or die $!; # print {$zonefiles->{$loc}} "$host $ttl IN A $val\n" or die $!; my $recdata = "$host. $ttl IN A $val\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # A elsif ($typemap{$type} eq 'NS') { if ($revrec eq 'y') { $val = NetAddr::IP->new($val); ##fixme: conversion for sub-/24 delegations in reverse zones? # if (!$val->{isv6} && ($val->masklen > 24)) { # } my $val2 = DNSDB::_ZONE($val, 'ZONE', 'r', '.').($val->{isv6} ? '.ip6.arpa' : '.in-addr.arpa'); $host .= "." if $host !~ /\.$/; my $recdata = "$val2. $ttl IN NS $host\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } else { my $recdata = "$host. $ttl IN NS $val.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } } # NS elsif ($typemap{$type} eq 'AAAA') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN AAAA $val\n" or die $!; my $recdata = "$host. $ttl IN AAAA $val\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # AAAA elsif ($typemap{$type} eq 'MX') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN MX $distance $val\n" or die $!; # should arguably swap host and val first, but MX records really don't make any sense in reverse zones, so any silliness that results from finding one doesn't much matter. my $recdata = "$host. $ttl IN MX $distance $val.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # MX elsif ($typemap{$type} eq 'TXT') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN TXT \"$val\"\n" or die $!; my $recdata = "$host. $ttl IN TXT \"$val\"\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # TXT elsif ($typemap{$type} eq 'CNAME') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN CNAME $val\n" or die $!; my $recdata = "$host. $ttl IN CNAME $val.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # CNAME elsif ($typemap{$type} eq 'SRV') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN SRV $distance $weight $port $val\n" or die $!; my $recdata = "$host $ttl IN SRV $distance $weight $port $val.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # SRV elsif ($typemap{$type} eq 'RP') { # ($host,$val) = __revswap($host,$val) if $revrec eq 'y'; # print {$zonefiles->{$loc}} "$host $ttl IN RP $val\n" or die $!; my $recdata = "$host. $ttl IN RP $val\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } # RP elsif ($typemap{$type} eq 'PTR') { # $$recflags{$val}++; # maybe track exclusions like this? so we can publish "all # A and/or PTR records" irrespective of template records $$recflags{$val} = 'ptr'; return if $host eq '%blank%'; if ($revrec eq 'y') { if ($val =~ /\.arpa$/) { # someone put in the formal .arpa name. humor them. my $recdata = "$val. $ttl IN PTR $host.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } else { $zone = NetAddr::IP->new($zone); if (!$zone->{isv6} && $zone->masklen > 24) { # sub-octet v4 zone ($val) = ($val =~ /\.(\d+)$/); my $recdata = "$val.".DNSDB::_ZONE($zone, 'ZONE', 'r', '.').".in-addr.arpa. $ttl IN PTR $host.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } else { # not going to care about strange results if $val is not an IP value and is resolveable in DNS $val = NetAddr::IP->new($val); my $recdata = DNSDB::_ZONE($val, 'ZONE', 'r', '.').($val->{isv6} ? '.ip6.arpa' : '.in-addr.arpa'). ". $ttl IN PTR $host.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } } # non-".arpa" $val } else { # PTRs in forward zones are less bizarre and insane than some other record types # in reverse zones... OTOH we can't validate them any which way, so we cross our # fingers and close our eyes and make it Someone Else's Problem. # print {$zonefiles->{$loc}} "$host $ttl IN PTR $val\n" or die $!; my $recdata = "$host. $ttl IN PTR $val.\n"; __recprint($zonefiles, $loclist, $loc, $recdata); } } # PTR elsif ($type == 65280) { # A+PTR # Recurse to PTR or A as appropriate because BIND et al don't share # the tinydns concept of merged forward/reverse records # %recflags gets updated in the PTR branch just above # $$recflags{$val}++; if ($revrec eq 'y') { printrec_bind($dnsdb, $zonefiles, $loclist, $recid, $revrec, $recflags, $zone, $host, 12, $val, $distance, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive); # ... but we need to tweak it for this case? so the A record gets published... #$$recflags{$val} = 'a+ptr'; #print {$zonefiles->{$loc}} "=$host:$val:$ttl:$stamp:$loc\n" or die $!; # printrec_bind($dnsdb, \%zonefiles, $recid, 'y', \@loclist, $revzone, # $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive); # my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl, # $loc, $stamp, $expires, $stampactive) = @_; } else { printrec_bind($dnsdb, $zonefiles, $loclist, $recid, $revrec, $recflags, $zone, $host, 1, $val, $distance, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive); # set a unique flag to skip template expansion for this IP in forward zones $$recflags{$val} = 'a'; } } # A+PTR elsif ($type == 65282) { # PTR template # only useful for v4 with standard DNS software, since this expands all # IPs in $zone (or possibly $val?) with autogenerated records $val = NetAddr::IP->new($val); return if $val->{isv6}; if ($val->masklen <= 16) { foreach my $sub ($val->split(16)) { __publish_template_bind($dnsdb, $sub, $recflags, $host, $zonefiles, $loclist, $ttl, $stamp, $loc, $zone, $revrec); } } else { __publish_template_bind($dnsdb, $val, $recflags, $host, $zonefiles, $loclist, $ttl, $stamp, $loc, $zone, $revrec); } } # PTR template elsif ($type == 65283) { # A+PTR template $val = NetAddr::IP->new($val); # Just In Case. An A+PTR should be impossible to add to a v6 revzone via API. return if $val->{isv6}; if ($val->masklen < 16) { foreach my $sub ($val->split(16)) { __publish_template_bind($dnsdb, $sub, $recflags, $host, $zonefiles, $loclist, $ttl, $stamp, $loc, $zone, $revrec); } } else { __publish_template_bind($dnsdb, $val, $recflags, $host, $zonefiles, $loclist, $ttl, $stamp, $loc, $zone, $revrec); } } # A+PTR template elsif ($type == 65284) { # AAAA+PTR template # Stub for completeness. Could be exported to DNS software that supports # some degree of internal automagic in generic-record-creation # (eg http://search.cpan.org/dist/AllKnowingDNS/ ) } # AAAA+PTR template } # printrec_bind() sub __publish_template_bind { my $dnsdb = shift; my $sub = shift; my $recflags = shift; my $hpat = shift; my $zonefiles = shift; my $loclist = shift; my $ttl = shift; my $stamp = shift; my $loc = shift; my $zpass = shift; my $zone = new NetAddr::IP $zpass; # my $zone = new NetAddr::IP shift; my $revrec = shift || 'y'; # my $ptrflag = shift || 0; ##fixme: default to PTR instead of A record for the BIND variant of this sub? # do this conversion once, not (number-of-ips-in-subnet) times my $arpabase = DNSDB::_ZONE($zone, 'ZONE.in-addr.arpa.', 'r', '.'); my $iplist = $sub->splitref(32); my $ipindex = -1; foreach (@$iplist) { my $ip = $_->addr; $ipindex++; # make as if we split the non-octet-aligned block into octet-aligned blocks as with SOA my $lastoct = (split /\./, $ip)[3]; # Allow smaller entries to override longer ones, eg, a specific PTR will # always publish, overriding any template record containing that IP. # %blank% also needs to be per-IP here to properly cascade overrides with # multiple nested templates # next if $$recflags{$ip}; # && $self->{skip_bcast_255} # next if $$recflags{$ip} && ($$recflags{$ip} eq 'ptr' || $$recflags{$ip} eq 'a+ptr'); if ($revrec eq 'y') { next if $$recflags{$ip}; # blanket exclusion; we do reverse records first } else { ##fixme: A record side templates not cascading correctly # excluding ptr does NOT work, as it excludes ALL previously covered A+PTR template entries. # we only want to exclude the singleton (A+)PTR ones #if ($$recflags{$ip} && ($$recflags{$ip} eq 'a' || $$recflags{$ip} eq 'ptr')) { if ($$recflags{$ip} && ($$recflags{$ip} eq 'a' || $$recflags{$ip} eq 'atemplate' || $$recflags{$ip} eq 'ptr')) { # default skip case next; } } # revrec branch for skipping template member expansion # set a forward/reverse-unique flag in %recflags $$recflags{$ip} = ($revrec eq 'y' ? 'ptrtemplate' : 'atemplate'); next if $hpat eq '%blank%'; my $rec = $hpat; # start fresh with the template for each IP ##fixme: there really isn't a good way to handle sub-/24 zones here. This way at least # seems less bad than some alternatives. $dnsdb->_template4_expand(\$rec, $ip, \$sub, $ipindex); # _template4_expand may blank $rec; if so, don't publish a record next if !$rec; ##fixme: trim merged record type voodoo. "if ($ptrflag) {} else {}" ? # if ($ptrflag || $zone->masklen > 24) { my $recdata; if ($revrec eq 'y') { # || $zone->masklen > 24) { # print $fh "^$lastoct.$arpabase:$rec:$ttl:$stamp:$loc\n" or die $!; ##fixme: use $ORIGIN instead? make the FQDN output switchable-optional? # print $fh "$lastoct.$arpabase $ttl IN PTR $rec\n" or die $!; # if ($revrec ne 'y') { # print a separate A record. Arguably we could use an = record here instead. # print $fh "+$rec:$ip:$ttl:$stamp:$loc\n" or die $!; # print $fh "$rec $ttl IN A $ip\n" or die $!; # } if ($dnsdb->{bind_export_fqdn}) { $recdata = "$lastoct.$arpabase $ttl IN PTR $rec.\n"; } else { $recdata = "$lastoct $ttl IN PTR $rec.\n"; } } else { # A record, not merged # print $fh "=$rec:$ip:$ttl:$stamp:$loc\n" or die $!; # print $fh "$rec $ttl IN A $ip\n" or die $!; $rec =~ s/\.$zone$// unless $dnsdb->{bind_export_fqdn}; $recdata = "$rec. $ttl IN A $ip\n"; } # and finally __recprint($zonefiles, $loclist, $loc, $recdata); } # foreach (@iplist) } # __publish_template_bind() # actual record printing sub # loop on the locations here so we don't end up with a huge pot of copypasta sub __recprint { my ($zonefiles, $loclist, $loc, $recdata) = @_; if ($loc eq '') { # "common" record visible in all locations foreach my $rloc (@{$loclist}) { print {$zonefiles->{$rloc}} $recdata or die $!; } } else { # record with specific location tagged print {$zonefiles->{$loc}} $recdata or die $!; } } 1;