c45cad105c
-Make dns.pm potentially work git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@5489 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
559 lines
21 KiB
Plaintext
559 lines
21 KiB
Plaintext
package xCAT_plugin::dns;
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use Getopt::Long;
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use Net::DNS;
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use xCAT::Table;
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use Sys::Hostname;
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use Socket;
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use strict;
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#This is a rewrite of DNS management using nsupdate rather than direct zone mangling
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my $callback;
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sub handled_commands
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{
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return {"makedns" => "dns"};
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}
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sub get_reverse_zone_for_entity {
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my $ctx = shift;
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my $node = shift;
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my $net;
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if ($ctx->{hoststab} and $ctx->{hoststab}->{$node} and $ctx->{hoststab}->{$node}->[0]->{ip}) {
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$node = $ctx->{hoststab}->{$node}->[0]->{ip};
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}
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my $tvar;
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if ($tvar = inet_aton($node)) { #This is an assignment, we are testing and storing the value in one shot
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$tvar = unpack("N",$tvar);
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foreach my $net (keys %{$ctx->{nets}}) {
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if ($ctx->{nets}->{$net}->{netn} == ($tvar & $ctx->{nets}->{$net}->{mask})) {
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my $maskstr = unpack("B32",pack("N",$ctx->{nets}->{$net}->{mask}));
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my $maskcount = ($maskstr =~ tr/1//);
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$maskcount+=((8-($maskcount%8))%8); #round to the next octet
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my $newmask = 2**$maskcount -1 << (32 - $maskcount);
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my $rev = inet_ntoa(pack("N",($tvar & $newmask)));
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my @zone;
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my @orig=split /\./,$rev;
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while ($maskcount) {
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$maskcount-=8;
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unshift(@zone,(shift @orig));
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}
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$rev = join('.',@zone);
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$rev .= '.IN-ADDR.ARPA';
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return $rev;
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}
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}
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}
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}
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sub process_request {
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my $request = shift;
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my $callback = shift;
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my $ctx = {};
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my @nodes;
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my $hadargs=0;
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my $allnodes;
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my $zapfiles;
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if ($request->{arg}) {
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$hadargs=1;
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@ARGV=@{$request->{arg}};
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if (!GetOptions(
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'a|all' => \$allnodes,
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'n|new' => \$zapfiles,
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)) {
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sendmsg([1,"TODO: makedns Usage message"]);
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return;
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}
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}
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if ($request->{node}) { #we have a noderange to process
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@nodes = @{$request->{node}};
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} elsif ($allnodes) {
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#read all nodelist specified nodes
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} else {
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#legacy behavior, read from /etc/hosts
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my $hostsfile;
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open($hostsfile,"<","/etc/hosts");
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my @contents = <$hostsfile>;
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close($hostsfile);
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my $addr;
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my $name;
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my $canonical;
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my $aliasstr;
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my @aliases;
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my $names;
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foreach (@contents) {
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s/#.*//; #strip comments;
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s/^[ \t]*//; #remove leading whitespace
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next unless ($_); #skip empty lines
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($addr,$names) = split /[ \t]+/,$_,2;
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if ($addr !~ /^\d+\.\d+\.\d+\.\d+$/) {
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sendmsg("Ignoring line $_ in /etc/hosts, only IPv4 format entries are supported currently");
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next;
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}
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unless ($canonical =~ /^[a-z0-9- \t\n]$/i) {
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sendmsg("Ignoring line $_ in /etc/hosts, names contain invalid characters (valid characters include a through z, numbers and the '-', but not '_'");
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next;
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}
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($canonical,$aliasstr) = split /[ \t]+/,$names,2;
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if ($aliasstr) {
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@aliases= split /[ \t]+/,$aliasstr;
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} else {
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@aliases = ();
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}
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}
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}
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my $hoststab = xCAT::Table->new('hosts',-create=>0);
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if ($hoststab) {
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$ctx->{hoststab} = $hoststab->getNodesAttribs(\@nodes,['ip']);
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}
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$ctx->{nodes} = \@nodes;
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my $networkstab = xCAT::Table->new('networks',-create=>0);
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unless ($networkstab) { sendmsg([1,'Unable to enumerate networks, try to run makenetworks']); }
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my @networks = $networkstab->getAllAttribs('net','mask');
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foreach (@networks) {
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my $maskn = unpack("N",inet_aton($_->{mask}));
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$ctx->{nets}->{$_->{net}}->{mask} = $maskn;
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$ctx->{nets}->{$_->{net}}->{netn} = unpack("N",inet_aton($_->{net}));
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}
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my $passtab = xCAT::Table->new('passwd');
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my $pent = $passtab->getAttribs({key=>'omapi',username=>'xcat_key'},['password']);
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if ($pent and $pent->{password}) {
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$ctx->{privkey} = $pent->{password};
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} #do not warn/error here yet, if we can't generate or extract, we'll know later
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my $sitetab = xCAT::Table->new('site');
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my $stab = $sitetab->getAttribs({key=>'domain'},['value']);
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unless ($stab and $stab->{value}) {
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sendmsg([1,"domain not defined in site table"]);
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return;
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}
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$ctx->{domain} = $stab->{value};
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$stab = $sitetab->getAttribs({key=>'forwarders'},['value']);
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if ($stab and $stab->{value}) {
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my @forwarders = split /[ ,]/,$stab->{value};
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$ctx->{forwarders}=\@forwarders;
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}
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$ctx->{zonestotouch}->{$ctx->{domain}}=1;
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foreach (@nodes) {
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$ctx->{revzones}->{$_} = get_reverse_zone_for_entity($ctx,$_);
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$ctx->{zonestotouch}->{$ctx->{revzones}->{$_}}=1;
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}
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use Data::Dumper;
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if (1) { #TODO: function to detect and return 1 if the master server is DNS SOA for all the zones we care about
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#here, we are examining local files to assure that our key is in named.conf, the zones we care about are there, and that if
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#active directory is in use, allow the domain controllers to update specific zones
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$stab =$sitetab->getAttribs({key=>'directoryprovider'},['value']);
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if ($stab and $stab->{value} and $stab->{value} eq 'activedirectory') {
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$stab =$sitetab->getAttribs({key=>'directoryservers'},['value']);
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if ($stab and $stab->{value} and $stab->{value}) {
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my @dservers = split /[ ,]/,$stab->{value};
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$ctx->{adservers} = \@dservers;
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$ctx->{adzones} = {
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"_msdcs.". $ctx->{domain} => 1,
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"_sites.". $ctx->{domain} => 1,
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"_tcp.". $ctx->{domain} => 1,
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"_udp.". $ctx->{domain} => 1,
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};
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}
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}
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$stab =$sitetab->getAttribs({key=>'dnsupdaters'},['value']); #allow unsecure updates from these
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if ($stab and $stab->{value} and $stab->{value}) {
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my @nservers = split /[ ,]/,$stab->{value};
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$ctx->{dnsupdaters} = \@nservers;
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}
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if ($zapfiles) { #here, we unlink all the existing files to start fresh
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}
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#We manipulate local namedconf
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$ctx->{dbdir} = get_dbdir();
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update_namedconf($ctx);
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update_zones($ctx);
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if ($ctx->{restartneeded}) {
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system("/sbin/service named start");
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system("/sbin/service named reload");
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}
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} else {
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unless ($ctx->{privkey}) {
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sendmsg([1,"Unable to update DNS due to lack of credentials in passwd to communicate with remote server"]);
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}
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}
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#now we stick to Net::DNS style updates, with TSIG if possible. TODO: kerberized (i.e. Windows) DNS server support, maybe needing to use nsupdate -g....
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$ctx->{resolver} = Net::DNS::Resolver->new();
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add_records($ctx);
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}
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sub get_dbdir {
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if (-d "/var/named") {
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return "/var/named/";
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} elsif (-d "/var/lib/named") {
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return "/var/lib/named/";
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} else {
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use File::Path;
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mkpath "/var/named/";
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return "/var/named/";
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}
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}
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sub update_zones {
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my $ctx = shift;
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my $currzone;
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my $dbdir = $ctx->{dbdir};
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my $domain = $ctx->{domain};
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my $name = hostname;
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my $node = $name;
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unless ($domain =~ /^\./) {
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$domain = '.'.$domain;
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}
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unless ($name =~ /\./) {
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$name .= $domain;
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}
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unless ($name =~ /\.\z/) {
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$name .= '.';
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}
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my $ip=$node;
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if ($ctx->{hoststab} and $ctx->{hoststab}->{$node} and $ctx->{hoststab}->{$node}->[0]->{ip}) {
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$ip = $ctx->{hoststab}->{$node}->[0]->{ip};
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} else {
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unless ($ip = inet_aton($ip)) {
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print "Unable to find an IP for $node in hosts table or via system lookup (i.e. /etc/hosts";
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sendmsg([1,"Unable to find an IP for $node in hosts table or via system lookup (i.e. /etc/hosts"]);
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next;
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}
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$ip = inet_ntoa($ip);
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}
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my @neededzones = keys %{$ctx->{zonestotouch}};
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push @neededzones,keys %{$ctx->{adzones}};
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my ($sec, $min, $hour, $mday, $mon, $year, $rest) = localtime(time);
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my $serial = ($mday * 100) + (($mon + 1) * 10000) + (($year + 1900) * 1000000);
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foreach $currzone (@neededzones) {
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if ($currzone =~ /IN-ADDR\.ARPA/) {
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$currzone =~ s/\.IN-ADDR\.ARPA.*//;
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my @octets = split/\./,$currzone;
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$currzone = join('.',reverse(@octets));
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}
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unless (-f $dbdir."/db.$currzone") {
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my $zonehdl;
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open($zonehdl,">",$dbdir."/db.$currzone");
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print $zonehdl '$TTL 86400'."\n";
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print $zonehdl '@ IN SOA '.$name." root.$name ( $serial 10800 3600 604800 86400 )\n";
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print $zonehdl " IN NS $name\n";
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if ($name =~ /$currzone/) { #Must guarantee an A record for the DNS server
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print $zonehdl "$name IN A $ip\n";
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}
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close($zonehdl);
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$ctx->{restartneeded}=1;
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}
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}
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}
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sub update_namedconf {
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my $ctx = shift;
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my $namedlocation = '/etc/named.conf';
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my $nameconf;
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my @newnamed;
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my $gotoptions=0;
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my $gotkey=0;
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my %didzones;
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if (-r $namedlocation) {
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my @currnamed=();
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open($nameconf,"<",$namedlocation);
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@currnamed=<$nameconf>;
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close($nameconf);
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my $i = 0;
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for ($i=0;$i<scalar(@currnamed);$i++) {
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my $line = $currnamed[$i];
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if ($line =~ /^options +\{/) {
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$gotoptions=1;
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my $skip=0;
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do {
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if ($ctx->{forwarders} and $line =~ /forwarders {/) {
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push @newnamed,"\tforwarders \{\n";
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$skip=1;
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foreach (@{$ctx->{forwarders}}) {
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push @newnamed,"\t\t".$_.";\n";
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}
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push @newnamed,"\t};\n";
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} elsif ($skip) {
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if ($line =~ /};/) {
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$skip = 0;
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}
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} else {
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push @newnamed,$line;
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}
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$i++;
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$line = $currnamed[$i];
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} while ($line !~ /^\};/);
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push @newnamed,$line;
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} elsif ($line =~ /^zone "([^"]*)" in \{/) {
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my $currzone = $1;
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if ($ctx->{zonestotouch}->{$currzone} or $ctx->{adzones}->{$currzone}) {
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$didzones{$currzone}=1;
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my @candidate = ($line);
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my $needreplace=1;
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do {
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$i++;
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$line = $currnamed[$i];
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push @candidate,$line;
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if ($line =~ /key xcat_key/) {
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$needreplace=0;
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}
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} while ($line !~ /^\};/); #skip the old file zone
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unless ($needreplace) {
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push @newnamed,@candidate;
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next;
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}
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$ctx->{restartneeded}=1;
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push @newnamed,"zone \"$currzone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
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my @list;
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if (not $ctx->{adzones}->{$currzone}) {
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if ($ctx->{dnsupdaters}) {
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@list = @{$ctx->{dnsupdaters}};
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}
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} else {
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if ($ctx->{adservers}) {
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@list = @{$ctx->{adservers}};
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}
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}
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foreach (@list) {
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push @newnamed,"\t\t$_;\n";
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}
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if ($currzone =~ /IN-ADDR\.ARPA/) {
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my $net = $currzone;
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$net =~ s/.IN-ADDR\.ARPA.*//;
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my @octets = split/\./,$net;
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$net = join('.',reverse(@octets));
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push @newnamed,"\t};\n","\tfile \"db.$net\";\n","};\n";
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} else {
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push @newnamed,"\t};\n","\tfile \"db.$currzone\";\n","};\n";
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}
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} else {
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push @newnamed,$line;
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do {
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$i++;
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$line = $currnamed[$i];
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push @newnamed,$line;
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} while ($line !~ /^\};/);
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}
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} elsif ($line =~ /^key xcat_key/) {
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$gotkey=1;
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if ($ctx->{privkey}) {
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#for now, assume the field is correct
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#push @newnamed,"key xcat_key {\n","\talgorithm hmac-md5;\n","\tsecret \"".$ctx->{privkey}."\";\n","};\n\n";
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push @newnamed,$line;
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do {
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$i++;
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$line = $currnamed[$i];
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push @newnamed,$line;
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} while ($line !~ /^\};/);
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} else {
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push @newnamed,$line;
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while ($line !~ /^\};/) { #skip the old file zone
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if ($line =~ /secret \"([^"]*)\"/) {
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my $passtab = xCAT::Table->new("passwd",-create=>1);
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$passtab->setAttribs({key=>"omapi",user=>"xcat_key"},{password=>$1});
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}
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$i++;
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$line = $currnamed[$i];
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push @newnamed,$line;
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}
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}
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} else {
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push @newnamed,$line;
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}
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}
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}
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unless ($gotoptions) {
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push @newnamed,"options {\n","\tdirectory \"".$ctx->{dbdir}."\";\n";
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if ($ctx->{forwarders}) {
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push @newnamed,"\tforwarders {\n";
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foreach (@{$ctx->{forwarders}}) {
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push @newnamed,"\t\t$_;\n";
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}
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push @newnamed,"\t};\n";
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}
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push @newnamed,"};\n\n";
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open($nameconf,"<",$namedlocation);
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}
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unless ($gotkey) {
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unless ($ctx->{privkey}) { #need to generate one
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$ctx->{privkey} = encode_base64(genpassword(32));
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}
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push @newnamed,"key xcat_key {\n","\talgorithm hmac-md5;\n","\tsecret \"".$ctx->{privkey}."\";\n","};\n\n";
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$ctx->{restartneeded}=1;
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}
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my $zone;
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foreach $zone (keys %{$ctx->{zonestotouch}}) {
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if ($didzones{$zone}) { next; }
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$ctx->{restartneeded}=1; #have to add a zone, a restart will be needed
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push @newnamed,"zone \"$zone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
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foreach (@{$ctx->{dnsupdaters}}) {
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push @newnamed,"\t\t$_;\n";
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}
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if ($zone =~ /IN-ADDR\.ARPA/) {
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my $net = $zone;
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$net =~ s/.IN-ADDR\.ARPA.*//;
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my @octets = split/\./,$net;
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$net = join('.',reverse(@octets));
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push @newnamed,"\t};\n","\tfile \"db.$net\";\n","};\n";
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} else {
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push @newnamed,"\t};\n","\tfile \"db.$zone\";\n","};\n";
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}
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}
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foreach $zone (keys %{$ctx->{adzones}}) {
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if ($didzones{$zone}) { next; }
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$ctx->{restartneeded}=1; #have to add a zone, a restart will be needed
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push @newnamed,"zone \"$zone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
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foreach (@{$ctx->{adservers}}) {
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push @newnamed,"\t\t$_;\n";
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}
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push @newnamed,"\t};\n","\tfile \"db.$zone\";\n","};\n\n";
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}
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my $newnameconf;
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open($newnameconf,">",$namedlocation);
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for my $l (@newnamed) { print $newnameconf $l; }
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close($newnameconf);
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}
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sub add_records {
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my $ctx = shift;
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unless ($ctx->{privkey}) {
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my $passtab = xCAT::Table->new('passwd');
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my $pent = $passtab->getAttribs({key=>'omapi',username=>'xcat_key'},['password']);
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if ($pent and $pent->{password}) {
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$ctx->{privkey} = $pent->{password};
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} else {
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sendmsg([1,"Unable to find omapi key in passwd table"]);
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}
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}
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my $node;
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my $ip;
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my $domain = $ctx->{domain}; # store off for lazy typing and possible local mangling
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unless ($domain =~ /^\./) { $domain = '.'.$domain; } #example.com becomes .example.com for consistency
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$ctx->{nsmap} = {}; #will store a map to known NS records to avoid needless redundant queries to sort nodes into domains
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$ctx->{updatesbyzone}={}; #sort all updates into their respective zones for bulk update for fewer DNS transactions
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foreach $node (@{$ctx->{nodes}}) {
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$ip = $node;
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my $name = $node;
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unless ($name =~ /$domain/) { $name .= $domain } # $name needs to represent fqdn, but must preserve $node as a nodename for cfg lookup
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#if (domaintab->{$node}->[0]->{domain) { $domain = domaintab->{$node}->[0]->{domain) }
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#above is TODO draft of how multi-domain support could come into play
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|
if ($ctx->{hoststab} and $ctx->{hoststab}->{$node} and $ctx->{hoststab}->{$node}->[0]->{ip}) {
|
|
$ip = $ctx->{hoststab}->{$node}->[0]->{ip};
|
|
} else {
|
|
unless ($ip = inet_aton($ip)) {
|
|
sendmsg([1,"Unable to find an IP for $node in hosts table or via system lookup (i.e. /etc/hosts"]);
|
|
next;
|
|
}
|
|
$ip = inet_ntoa($ip);
|
|
}
|
|
$ctx->{currip}=$ip;
|
|
#time to update, A and PTR records, IPv6 still TODO
|
|
$ip = join('.',reverse(split(/\./,$ip)));
|
|
$ip .= '.IN-ADDR.ARPA.';
|
|
#ok, now it is time to identify which zones should actually hold the forward (A) and reverse (PTR) records and a nameserver to handle the request
|
|
my $revzone = $ip;
|
|
$ctx->{currnode}=$node;
|
|
$ctx->{currname}=$name;
|
|
$ctx->{currrevname}=$ip;
|
|
find_nameserver_for_dns($ctx,$revzone);
|
|
find_nameserver_for_dns($ctx,$domain);
|
|
}
|
|
my $zone;
|
|
foreach $zone (keys %{$ctx->{updatesbyzone}}) {
|
|
my $resolver = Net::DNS::Resolver->new(nameservers=>[$ctx->{nsmap}->{$zone}]);
|
|
my $update = Net::DNS::Update->new($zone);
|
|
foreach (@{$ctx->{updatesbyzone}->{$zone}}) {
|
|
$update->push(update=>rr_add($_));
|
|
}
|
|
$update->sign_tsig("xcat_key",$ctx->{privkey});
|
|
my $reply = $resolver->send($update);
|
|
print Dumper($reply);
|
|
}
|
|
}
|
|
sub find_nameserver_for_dns {
|
|
my $ctx = shift;
|
|
my $zone = shift;
|
|
my $node = $ctx->{currnode};
|
|
my $ip = $ctx->{currip};
|
|
my $rname = $ctx->{currrevname};
|
|
my $name = $ctx->{currname};
|
|
unless ($name =~ /\.\z/) { $name .= '.' }
|
|
my $rrcontent = "$name IN A $ip";
|
|
if ($zone =~ /IN-ADDR.ARPA/) { #reverse style
|
|
$rrcontent = "$rname IN PTR $name";
|
|
}
|
|
while ($zone) {
|
|
unless (defined $ctx->{nsmap}->{$zone}) { #ok, we already thought about this zone and made a decision
|
|
print $zone."\n";
|
|
my $reply = $ctx->{resolver}->query($zone,'NS');
|
|
if ($reply) {
|
|
foreach my $record ($reply->answer) {
|
|
$ctx->{nsmap}->{$zone} = $record->nsdname;
|
|
}
|
|
} else {
|
|
$ctx->{nsmap}->{$zone} = 0;
|
|
}
|
|
}
|
|
if ($ctx->{nsmap}->{$zone}) { #we have a nameserver for this zone, therefore this zone is one to update
|
|
if ($ctx->{updatesbyzone}->{$zone}) { #attach to existing list of updates
|
|
push @{$ctx->{updatesbyzone}->{$zone}},$rrcontent;
|
|
} else { #create a new list.
|
|
$ctx->{updatesbyzone}->{$zone} = [ $rrcontent ];
|
|
}
|
|
last;
|
|
} else { #we have it defined, but zero, means search higher domains. Possible to shortcut further by pointing to the right domain, maybe later
|
|
$zone =~ s/^[^\.]*\.//; #strip all up to and including first dot
|
|
unless ($zone) {
|
|
sendmsg([1,"Unable to find reverse lookup zone to hold $ip"],$node);
|
|
last;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
sub sendmsg {
|
|
# my $callback = $output_handler;
|
|
my $text = shift;
|
|
my $node = shift;
|
|
my $descr;
|
|
my $rc;
|
|
if (ref $text eq 'HASH') {
|
|
die "not right now";
|
|
} elsif (ref $text eq 'ARRAY') {
|
|
$rc = $text->[0];
|
|
$text = $text->[1];
|
|
}
|
|
if ($text =~ /:/) {
|
|
($descr,$text) = split /:/,$text,2;
|
|
}
|
|
$text =~ s/^ *//;
|
|
$text =~ s/ *$//;
|
|
my $msg;
|
|
my $curptr;
|
|
if ($node) {
|
|
$msg->{node}=[{name => [$node]}];
|
|
$curptr=$msg->{node}->[0];
|
|
} else {
|
|
$msg = {};
|
|
$curptr = $msg;
|
|
}
|
|
if ($rc) {
|
|
$curptr->{errorcode}=[$rc];
|
|
$curptr->{error}=[$text];
|
|
$curptr=$curptr->{error}->[0];
|
|
if (defined $node) {
|
|
$allerrornodes{$node}=1;
|
|
}
|
|
} else {
|
|
$curptr->{data}=[{contents=>[$text]}];
|
|
$curptr=$curptr->{data}->[0];
|
|
if ($descr) { $curptr->{desc}=[$descr]; }
|
|
}
|
|
# print $outfd freeze([$msg]);
|
|
# print $outfd "\nENDOFFREEZE6sK4ci\n";
|
|
# yield;
|
|
# waitforack($outfd);
|
|
$callback->($msg);
|
|
}
|