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 858 2022-09-15 21:28:10Z 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, $cidr->masklen % 8;
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63 |
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64 |
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65 | eval {
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66 |
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67 | # write fresh records if:
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68 | # - we are not using the cache
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69 | # - force_refresh is set
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70 | # - the zone has changed
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71 | # - the cache file does not exist
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72 | # - the cache file is empty
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73 | if (!$dnsdb->{usecache} || $dnsdb->{force_refresh} || $changed || !-e $cachefile || -z $cachefile) {
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74 | if ($dnsdb->{usecache}) {
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75 | open ZONECACHE, ">$tmpcache" or die "Error creating temporary file $tmpcache: $!\n";
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76 | $zonefilehandle = *ZONECACHE;
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77 | }
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78 |
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79 | # fetch a list of views/locations present in the zone. we need to publish a file for each one.
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80 | # in the event that no locations are present (~~ $viewlist is empty), /%view collapses to nothing in the zone path
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81 | my (@loclist) = $dnsdb->{dbh}->selectrow_array("SELECT DISTINCT location FROM records WHERE rdns_id = ?", undef, $revid);
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82 | push @loclist, $defloc unless grep /$defloc/, @loclist;
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83 | my $zonepath = $dnsdb->{bind_export_reverse_zone_path};
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84 | my %zonefiles; # to be a list of file handles.
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85 | ##fixme: need to open separate zone files for aggregated metazones eg /22 or /14
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86 | foreach my $loc (@loclist) {
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87 | my $zfilepath = $zonepath;
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88 | $zfilepath =~ s/\%view/$loc/;
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89 | $zfilepath =~ s/\%zone/$revzone/;
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90 | my $arpazone = DNSDB::_ZONE($cidr, 'ZONE', 'r', '.').($cidr->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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91 | $zfilepath =~ s/\%arpazone/$arpazone/;
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92 | # Just In Case(TM)
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93 | $zfilepath =~ s,[^\w./-],_,g;
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94 | #open $zonefiles{$loc}, ">", $zfilepath;
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95 | print "open zonefile for '$loc', '$zfilepath'\n";
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96 | }
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97 |
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98 | # need to fetch this separately since the rest of the records all (should) have real IPs in val
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99 | $soasth->execute($revid);
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100 | my (@zsoa) = $soasth->fetchrow_array();
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101 | printrec_bind($zonefilehandle, $zsoa[7], 'y', \@loclist, $revzone,
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102 | $zsoa[0],$zsoa[1],$zsoa[2],$zsoa[3],$zsoa[4],$zsoa[5],$zsoa[6],$zsoa[8],'');
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103 |
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104 | $recsth->execute($revid);
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105 | my $fullzone = _ZONE($tmpzone, 'ZONE', 'r', '.').($tmpzone->{isv6} ? '.ip6.arpa' : '.in-addr.arpa');
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106 |
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107 | while (my ($host, $type, $val, $dist, $weight, $port, $ttl, $recid, $loc, $stamp, $expires, $stampactive)
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108 | = $recsth->fetchrow_array) {
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109 | next if $recflags{$recid};
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110 |
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111 | # Check for out-of-zone data
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112 | if ($val =~ /\.arpa$/) {
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113 | # val is non-IP
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114 | if ($val !~ /$fullzone$/) {
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115 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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116 | next;
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117 | }
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118 | } else {
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119 | my $ipval = new NetAddr::IP $val;
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120 | if (!$tmpzone->contains($ipval)) {
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121 | warn "Not exporting out-of-zone record $val $typemap{$type} $host, $ttl (zone $tmpzone)\n";
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122 | next;
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123 | }
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124 | } # is $val a raw .arpa name?
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125 |
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126 | # Spaces are evil.
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127 | $val =~ s/^\s+//;
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128 | $val =~ s/\s+$//;
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129 | if ($typemap{$type} ne 'TXT') {
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130 | # Leading or trailng spaces could be legit in TXT records.
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131 | $host =~ s/^\s+//;
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132 | $host =~ s/\s+$//;
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133 | }
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134 |
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135 | printrec_bind($zonefilehandle, $recid, 'y', \%recflags, $revzone,
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136 | $host, $type, $val, $dist, $weight, $port, $ttl, $loc, $stamp, $expires, $stampactive);
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137 |
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138 | $recflags{$recid} = 1;
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139 |
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140 | } # while ($recsth)
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141 |
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142 | if ($dnsdb->{usecache}) {
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143 | close ZONECACHE; # force the file to be written
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144 | # catch obvious write errors that leave an empty temp file
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145 | if (-s $tmpcache) {
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146 | rename $tmpcache, $cachefile
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147 | or die "Error overwriting cache file $cachefile with temporary file: $!\n";
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148 | }
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149 | }
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150 |
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151 | } # if $changed or cache filesize is 0
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152 |
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153 | };
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154 | if ($@) {
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155 | die "error writing ".($dnsdb->{usecache} ? 'new data for ' : '')."$revzone: $@\n";
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156 | # error! something borked, and we should be able to fall back on the old cache file
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157 | # report the error, somehow.
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158 | } else {
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159 | # mark zone as unmodified. Only do this if no errors, that way
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160 | # export failures should recover a little more automatically.
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161 | $zonesth->execute($revid);
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162 | }
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163 |
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164 | # if ($dnsdb->{usecache}) {
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165 | # # We've already made as sure as we can that a cached zone file is "good",
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166 | # # although possibly stale/obsolete due to errors creating a new one.
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167 | # eval {
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168 | # open CACHE, "<$cachefile" or die $!;
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169 | # print $datafile $_ or die "error copying cached $revzone to master file: $!" while <CACHE>;
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170 | # close CACHE;
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171 | # };
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172 | # die $@ if $@;
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173 | # }
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174 |
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175 |
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176 |
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177 | } # revsth->fetch
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178 |
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179 |
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180 | # Write the view configuration last, because otherwise we have to be horribly inefficient
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181 | # at figuring out which zones are visible/present in which views
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182 | if ($viewlist) {
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183 | my $tmpconf = "$dnsdb->{bind_zone_conf}.$$"; ##fixme: split filename for prefixing
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184 | open BINDCONF, ">", $tmpconf;
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185 |
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186 | foreach my $view (@{$viewlist}) {
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187 | #print Dumper($view);
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188 | print BINDCONF "view $view->{location} {\n";
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189 | # print "view $view->{location} {\n";
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190 | # could also use an acl { ... }; statement, then match-clients { aclname; };, but that gets hairy
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191 | # note that some semantics of data visibility need to be handled by the record export, since it's
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192 | # not 100% clear if the semantics of a tinydns view with an empty IP list (matches anyone) are the
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193 | # same as a BIND view with match-clients { any; };
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194 | if ($view->{iplist}) {
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195 | print BINDCONF " match-clients { ".join("; ", $view->iplist)."; };\n";
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196 | # print " match-clients { ".join("; ", split(/[\s,]+/, $view->{iplist}))."; };\n";
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197 | } else {
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198 | print BINDCONF " match-clients { any; };\n";
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199 | # print " match-clients { any; };\n";
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200 | }
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201 | foreach my $zone (@{$viewzones{$view->{location}}}) {
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202 | ##fixme: notify settings, maybe per-zone?
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203 | print qq( zone "$zone" IN {\n\ttype master;\n\tnotify no;\n\tfile "db.$zone";\n };\n);
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204 | }
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205 | print "};\n\n";
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206 | } # foreach @$viewlist
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207 | rename $tmpconf, $dnsdb->{bind_zone_conf};
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208 | } # if $viewlist
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209 |
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210 | } # export()
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211 |
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212 |
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213 | # Print individual records in BIND format
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214 | sub printrec_bind {
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215 | my $dnsdb = shift;
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216 | my ($zonefiles, $recid, $revrec, $loclist, $zone, $host, $type, $val, $distance, $weight, $port, $ttl,
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217 | $loc, $stamp, $expires, $stampactive) = @_;
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218 |
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219 | # Just In Case something is lingering in the DB
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220 | $loc = '' if !$loc;
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221 |
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222 | ## And now to the records!
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223 |
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224 | if ($typemap{$type} eq 'SOA') {
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225 | # host contains pri-ns:responsible
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226 | # val is abused to contain refresh:retry:expire:minttl
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227 | # let's be explicit about abusing $host and $val
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228 | my ($email, $primary) = (split /:/, $host)[0,1];
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229 | my ($refresh, $retry, $expire, $min_ttl) = (split /:/, $val)[0,1,2,3];
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230 | my $serial = 0; # fail less horribly than leaving it empty?
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231 | # just snarfing the right SOA serial for the zone type
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232 | if ($revrec eq 'y') {
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233 | ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM revzones WHERE revnet=?", undef, $zone);
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234 | } else {
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235 | ($serial) = $dnsdb->{dbh}->selectrow_array("SELECT zserial FROM domains WHERE domain=?", undef, $zone);
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236 | } # revrec <> 'y'
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237 | # suppress a "uninitialized value" warning. should be impossible but...
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238 | # abuse hours as the last digit pair of the serial for simplicity
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239 | ##fixme?: alternate SOA serial schemes?
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240 | $serial = strftime("%Y%m%d%H", localtime()) if !$serial;
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241 | # print *{$zonefiles->{$loc}} "Z$zone:$primary:$email:$serial:$refresh:$retry:$expire:$min_ttl:$ttl:$stamp:$loc\n"
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242 | # or die $!;
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243 | print *{$zonefiles->{$loc}} "$zone $ttl IN SOA $primary $email ( $serial $refresh $retry $expire $min_ttl )\n"
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244 | or die $!;
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245 | } # SOA
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246 |
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247 | } # printrec_bind()
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248 |
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249 |
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250 | 1;
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