ce42fbcf9d
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@8295 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
780 lines
30 KiB
Perl
780 lines
30 KiB
Perl
package xCAT_plugin::ddns;
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use strict;
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use Getopt::Long;
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use Net::DNS;
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use File::Path;
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use xCAT::Table;
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use Sys::Hostname;
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use MIME::Base64;
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use xCAT::SvrUtils;
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use Socket;
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use Fcntl qw/:flock/;
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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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my $service="named";
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sub handled_commands
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{
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return {"makedns" => "site:dnshandler"};
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}
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sub getzonesfornet {
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my $net = shift;
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my $mask = shift;
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my @zones = ();
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#return all in-addr reverse zones for a given mask and net
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#for class a,b,c, the answer is easy
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#for classless, identify the partial byte, do $netbyte | (0xff&~$maskbyte) to get the highest value
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#return sequence from $net to value calculated above
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#since old bind.pm only went as far as class c, we will carry that over for now (more people with smaller than class c complained
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#and none hit the theoretical conflict. FYI, the 'official' method in RFC 2317 seems cumbersome, but maybe one day it makes sense
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#since this is dhcpv4 for now, we'll use the inet_aton, ntop functions to generate the answers (dhcpv6 omapi would be nice...)
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my $netn = inet_aton($net);
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my $maskn = inet_aton($mask);
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unless ($netn and $mask) { return (); }
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my $netnum = unpack('N',$netn);
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my $masknum = unpack('N',$maskn);
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if ($masknum >= 0xffffff00) { #treat all netmasks higher than 255.255.255.0 as class C
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$netnum = $netnum & 0xffffff00;
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$netn = pack('N',$netnum);
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$net = inet_ntoa($netn);
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$net =~ s/\.[^\.]*$//;
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return (join('.',reverse(split('\.',$net))).'.IN-ADDR.ARPA.');
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} elsif ($masknum > 0xffff0000) { #(/17) to /23
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my $tempnumber = ($netnum >> 8);
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$masknum = $masknum >> 8;
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my $highnet = $tempnumber | (0xffffff & ~$masknum);
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foreach ($tempnumber..$highnet) {
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$netnum = $_ << 8;
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$net = inet_ntoa(pack('N',$netnum));
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$net =~ s/\.[^\.]*$//;
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push @zones,join('.',reverse(split('\.',$net))).'.IN-ADDR.ARPA.';
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}
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return @zones;
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} elsif ($masknum > 0xff000000) { # (/9) to class b /16, could have made it more flexible, for for only two cases, not worth in
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my $tempnumber = ($netnum >> 16); #the last two bytes are insignificant, shift them off to make math easier
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$masknum = $masknum >> 16;
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my $highnet = $tempnumber | (0xffff & ~$masknum);
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foreach ($tempnumber..$highnet) {
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$netnum = $_ << 16; #convert back to the real network value
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$net = inet_ntoa(pack('N',$netnum));
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$net =~ s/\.[^\.]*$//;
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$net =~ s/\.[^\.]*$//;
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push @zones,join('.',reverse(split('\.',$net))).'.IN-ADDR.ARPA.';
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}
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return @zones;
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} else { #class a (theoretically larger, but those shouldn't exist)
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my $tempnumber = ($netnum >> 24); #the last two bytes are insignificant, shift them off to make math easier
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$masknum = $masknum >> 24;
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my $highnet = $tempnumber | (0xff & ~$masknum);
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foreach ($tempnumber..$highnet) {
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$netnum = $_ << 24; #convert back to the real network value
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$net = inet_ntoa(pack('N',$netnum));
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$net =~ s/\.[^\.]*$//;
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$net =~ s/\.[^\.]*$//;
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$net =~ s/\.[^\.]*$//;
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push @zones,join('.',reverse(split('\.',$net))).'.IN-ADDR.ARPA.';
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}
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return @zones;
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}
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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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return undef;
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}
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sub process_request {
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my $request = shift;
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$callback = shift;
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umask 0007;
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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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my $deletemode=0;
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if ($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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'd|delete' => \$deletemode,
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)) {
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xCAT::SvrUtils::sendmsg([1,"TODO: makedns Usage message"], $callback);
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return;
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}
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}
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$ctx->{deletemode}=$deletemode;
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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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xCAT::SvrUtils::sendmsg([1,"domain not defined in site table"], $callback);
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return;
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}
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$ctx->{domain} = $stab->{value};
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if ($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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flock($hostsfile,LOCK_SH);
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my @contents = <$hostsfile>;
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flock($hostsfile,LOCK_UN);
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close($hostsfile);
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my $domain = $ctx->{domain};
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unless ($domain =~ /^\./) { $domain = '.'.$domain; }
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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 $names;
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foreach (@contents) {
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chomp; #no newline
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s/#.*//; #strip comments;
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s/^[ \t\n]*//; #remove leading whitespace
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next unless ($_); #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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xCAT::SvrUtils::sendmsg(":Ignoring line $_ in /etc/hosts, only IPv4 format entries are supported currently", $callback);
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next;
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}
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unless ($names =~ /^[a-z0-9\. \t\n-]+$/i) {
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xCAT::SvrUtils::sendmsg(":Ignoring line $_ in /etc/hosts, names $names contain invalid characters (valid characters include a through z, numbers and the '-', but not '_'", $callback);
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next;
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}
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($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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my %names = ();
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my $node = $canonical;
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unless ($canonical =~ /$domain/) {
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$canonical.=$domain;
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}
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unless ($canonical =~ /\.\z/) { $canonical .= '.' } #for only the sake of comparison, ensure consistant dot suffix
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foreach my $alias (@aliases) {
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unless ($alias =~ /$domain/) {
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$alias .= $domain;
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}
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unless ($alias =~ /\.\z/) {
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$alias .= '.';
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}
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if ($alias eq $canonical) {
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next;
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}
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$ctx->{aliases}->{$node}->{$alias}=1; #remember alias for CNAM records later
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}
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push @nodes,$node;
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$ctx->{nodeips}->{$node}->{$addr}=1;
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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) { xCAT::SvrUtils::sendmsg([1,'Unable to enumerate networks, try to run makenetworks'], $callback); }
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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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my $currzone;
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foreach $currzone (getzonesfornet($_->{net},$_->{mask})) {
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$ctx->{zonestotouch}->{$currzone} = 1;
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}
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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} = $pent->{password};
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} #do not warn/error here yet, if we can't generate or extract, we'll know later
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$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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my $revzone = get_reverse_zone_for_entity($ctx,$_);;
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unless ($revzone) { next; }
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$ctx->{revzones}->{$_} = $revzone;
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$ctx->{zonestotouch}->{$ctx->{revzones}->{$_}}=1;
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}
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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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system("/sbin/service $service stop"); #named may otherwise hold on to stale journal filehandles
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my $conf = get_conf();
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unlink $conf;
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my $DBDir = get_dbdir();
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foreach (<$DBDir/db.*>) {
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unlink $_;
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}
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}
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#We manipulate local namedconf
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$ctx->{dbdir} = get_dbdir();
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$ctx->{zonesdir} = get_zonesdir();
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chmod 0775, $ctx->{dbdir}; # assure dynamic dns can actually execute against the directory
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update_namedconf($ctx);
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update_zones($ctx);
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if ($ctx->{restartneeded}) {
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xCAT::SvrUtils::sendmsg("Restarting $service", $callback);
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system("/sbin/service $service start");
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system("/sbin/service $service reload");
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xCAT::SvrUtils::sendmsg("Restarting named complete", $callback);
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}
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} else {
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unless ($ctx->{privkey}) {
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xCAT::SvrUtils::sendmsg([1,"Unable to update DNS due to lack of credentials in passwd to communicate with remote server"], $callback);
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}
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}
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#now we stick to Net::DNS style updates, with TSIG if possible. TODO: kerberized (i.e. Windows) DNS server support, maybe needing to use nsupdate -g....
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$ctx->{resolver} = Net::DNS::Resolver->new();
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add_or_delete_records($ctx);
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}
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sub get_zonesdir {
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my $ZonesDir = get_dbdir();
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my $sitetab = xCAT::Table->new('site');
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unless ($sitetab)
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{
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my $rsp = {};
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$rsp->{data}->[0] = "No site table found.\n";
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xCAT::MsgUtils->message("E", $rsp, $callback, 1);
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}
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if ($sitetab) {
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($ref) = $sitetab->getAttribs({key => 'bindzones'}, 'value');
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if ($ref and $ref->{value}) {
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$ZonesDir= $ref->{value};
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}
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}
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return "$ZonesDir";
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}
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sub get_conf {
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my $conf="/etc/named.conf";
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my $sitetab = xCAT::Table->new('site');
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unless ($sitetab)
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{
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my $rsp = {};
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$rsp->{data}->[0] = "No site table found.\n";
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xCAT::MsgUtils->message("E", $rsp, $callback, 1);
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}
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if ($sitetab) {
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($ref) = $sitetab->getAttribs({key => 'bindconf'}, 'value');
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if ($ref and $ref->{value}) {
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$conf= $ref->{value};
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}
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}
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return "$conf";
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}
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sub get_dbdir {
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my $DBDir;
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my $sitetab = xCAT::Table->new('site');
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unless ($sitetab) {
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my $rsp = {};
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$rsp->{data}->[0] = "No site table found.\n";
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xCAT::MsgUtils->message("E", $rsp, $callback, 1);
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}
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if ($sitetab) {
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(my $ref) = $sitetab->getAttribs({key => 'binddir'}, 'value');
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if ($ref and $ref->{value}) {
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$DBDir = $ref->{value};
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}
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}
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if ( -d "$DBDir" ) {
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return "$DBDir"
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} elsif (-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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mkpath "/var/named/";
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chown(scalar(getpwnam('named')),scalar(getgrnam('named')),"/var/named");
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return "/var/named/";
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}
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}
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sub isvalidip {
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#inet_pton/ntop good for ensuring an ip looks like an ip? or do string compare manually?
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#for now, do string analysis, one problem with pton/ntop is that 010.1.1.1 would look diff from 10.1.1.1)
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my $candidate = shift;
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if ($candidate =~ /^(\d+)\.(\d+)\.(\d+).(\d+)\z/) {
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return (
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$1 >= 0 and $1 <= 255 and
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$2 >= 0 and $2 <= 255 and
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$3 >= 0 and $3 <= 255 and
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$4 >= 0 and $4 <= 255
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);
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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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unless (isvalidip($ip)) {
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xCAT::SvrUtils::sendmsg([1,"The hosts table entry for $node indicates $ip as an ip address, which is not a valid address"], $callback);
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next;
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}
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} else {
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unless ($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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xCAT::SvrUtils::sendmsg([1,"Unable to find an IP for $node in hosts table or via system lookup (i.e. /etc/hosts"], $callback);
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next;
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}
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$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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my $zonefilename = $currzone;
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if ($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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$currzone = join('.',reverse(@octets));
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$zonefilename = $currzone;
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#If needed, the below, but it was a fairly painfully restricted paradigm for zonefile names...
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#} elsif (not $zonefilename =~ /_/) {
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# $zonefilename =~ s/\..*//; #compatible with bind.pm
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}
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unless (-f $dbdir."/db.$zonefilename") {
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my $zonehdl;
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open($zonehdl,">>",$dbdir."/db.$zonefilename");
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flock($zonehdl,LOCK_EX);
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seek($zonehdl,0,0);
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truncate($zonehdl,0);
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|
print $zonehdl '$TTL 86400'."\n";
|
|
print $zonehdl '@ IN SOA '.$name." root.$name ( $serial 10800 3600 604800 86400 )\n";
|
|
print $zonehdl " IN NS $name\n";
|
|
if ($name =~ /$currzone/) { #Must guarantee an A record for the DNS server
|
|
print $zonehdl "$name IN A $ip\n";
|
|
}
|
|
flock($zonehdl,LOCK_UN);
|
|
close($zonehdl);
|
|
chown(scalar(getpwnam('named')),scalar(getgrnam('named')),$dbdir."/db.$zonefilename");
|
|
$ctx->{restartneeded}=1;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
sub update_namedconf {
|
|
my $ctx = shift;
|
|
my $namedlocation = get_conf();
|
|
my $nameconf;
|
|
my @newnamed;
|
|
my $gotoptions=0;
|
|
my $gotkey=0;
|
|
my %didzones;
|
|
if (-r $namedlocation) {
|
|
my @currnamed=();
|
|
open($nameconf,"<",$namedlocation);
|
|
flock($nameconf,LOCK_SH);
|
|
@currnamed=<$nameconf>;
|
|
flock($nameconf,LOCK_UN);
|
|
close($nameconf);
|
|
my $i = 0;
|
|
for ($i=0;$i<scalar(@currnamed);$i++) {
|
|
my $line = $currnamed[$i];
|
|
if ($line =~ /^options +\{/) {
|
|
$gotoptions=1;
|
|
my $skip=0;
|
|
do {
|
|
if ($ctx->{forwarders} and $line =~ /forwarders {/) {
|
|
push @newnamed,"\tforwarders \{\n";
|
|
$skip=1;
|
|
foreach (@{$ctx->{forwarders}}) {
|
|
push @newnamed,"\t\t".$_.";\n";
|
|
}
|
|
push @newnamed,"\t};\n";
|
|
} elsif ($skip) {
|
|
if ($line =~ /};/) {
|
|
$skip = 0;
|
|
}
|
|
} else {
|
|
push @newnamed,$line;
|
|
}
|
|
$i++;
|
|
$line = $currnamed[$i];
|
|
} while ($line !~ /^\};/);
|
|
push @newnamed,$line;
|
|
} elsif ($line =~ /^zone "([^"]*)" in \{/) {
|
|
my $currzone = $1;
|
|
if ($ctx->{zonestotouch}->{$currzone} or $ctx->{adzones}->{$currzone}) {
|
|
$didzones{$currzone}=1;
|
|
my @candidate = ($line);
|
|
my $needreplace=1;
|
|
do {
|
|
$i++;
|
|
$line = $currnamed[$i];
|
|
push @candidate,$line;
|
|
if ($line =~ /key xcat_key/) {
|
|
$needreplace=0;
|
|
}
|
|
} while ($line !~ /^\};/); #skip the old file zone
|
|
unless ($needreplace) {
|
|
push @newnamed,@candidate;
|
|
next;
|
|
}
|
|
$ctx->{restartneeded}=1;
|
|
push @newnamed,"zone \"$currzone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
|
|
my @list;
|
|
if (not $ctx->{adzones}->{$currzone}) {
|
|
if ($ctx->{dnsupdaters}) {
|
|
@list = @{$ctx->{dnsupdaters}};
|
|
}
|
|
} else {
|
|
if ($ctx->{adservers}) {
|
|
@list = @{$ctx->{adservers}};
|
|
}
|
|
}
|
|
foreach (@list) {
|
|
push @newnamed,"\t\t$_;\n";
|
|
}
|
|
if ($currzone =~ /IN-ADDR\.ARPA/) {
|
|
my $net = $currzone;
|
|
$net =~ s/.IN-ADDR\.ARPA.*//;
|
|
my @octets = split/\./,$net;
|
|
$net = join('.',reverse(@octets));
|
|
push @newnamed,"\t};\n","\tfile \"db.$net\";\n","};\n";
|
|
|
|
} else {
|
|
my $zfilename = $currzone;
|
|
#$zfilename =~ s/\..*//;
|
|
push @newnamed,"\t};\n","\tfile \"db.$zfilename\";\n","};\n";
|
|
}
|
|
} else {
|
|
push @newnamed,$line;
|
|
do {
|
|
$i++;
|
|
$line = $currnamed[$i];
|
|
push @newnamed,$line;
|
|
} while ($line !~ /^\};/);
|
|
}
|
|
|
|
} elsif ($line =~ /^key xcat_key/) {
|
|
$gotkey=1;
|
|
if ($ctx->{privkey}) {
|
|
#for now, assume the field is correct
|
|
#push @newnamed,"key xcat_key {\n","\talgorithm hmac-md5;\n","\tsecret \"".$ctx->{privkey}."\";\n","};\n\n";
|
|
push @newnamed,$line;
|
|
do {
|
|
$i++;
|
|
$line = $currnamed[$i];
|
|
push @newnamed,$line;
|
|
} while ($line !~ /^\};/);
|
|
} else {
|
|
push @newnamed,$line;
|
|
while ($line !~ /^\};/) { #skip the old file zone
|
|
if ($line =~ /secret \"([^"]*)\"/) {
|
|
my $passtab = xCAT::Table->new("passwd",-create=>1);
|
|
$passtab->setAttribs({key=>"omapi",username=>"xcat_key"},{password=>$1});
|
|
}
|
|
$i++;
|
|
$line = $currnamed[$i];
|
|
push @newnamed,$line;
|
|
}
|
|
}
|
|
} else {
|
|
push @newnamed,$line;
|
|
}
|
|
}
|
|
}
|
|
unless ($gotoptions) {
|
|
push @newnamed,"options {\n","\tdirectory \"".$ctx->{zonesdir}."\";\n";
|
|
if ($ctx->{forwarders}) {
|
|
push @newnamed,"\tforwarders {\n";
|
|
foreach (@{$ctx->{forwarders}}) {
|
|
push @newnamed,"\t\t$_;\n";
|
|
}
|
|
push @newnamed,"\t};\n";
|
|
}
|
|
push @newnamed,"};\n\n";
|
|
}
|
|
unless ($gotkey) {
|
|
unless ($ctx->{privkey}) { #need to generate one
|
|
$ctx->{privkey} = encode_base64(genpassword(32));
|
|
chomp($ctx->{privkey});
|
|
}
|
|
push @newnamed,"key xcat_key {\n","\talgorithm hmac-md5;\n","\tsecret \"".$ctx->{privkey}."\";\n","};\n\n";
|
|
$ctx->{restartneeded}=1;
|
|
}
|
|
my $zone;
|
|
foreach $zone (keys %{$ctx->{zonestotouch}}) {
|
|
if ($didzones{$zone}) { next; }
|
|
$ctx->{restartneeded}=1; #have to add a zone, a restart will be needed
|
|
push @newnamed,"zone \"$zone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
|
|
foreach (@{$ctx->{dnsupdaters}}) {
|
|
push @newnamed,"\t\t$_;\n";
|
|
}
|
|
if ($zone =~ /IN-ADDR\.ARPA/) {
|
|
my $net = $zone;
|
|
$net =~ s/.IN-ADDR\.ARPA.*//;
|
|
my @octets = split/\./,$net;
|
|
$net = join('.',reverse(@octets));
|
|
push @newnamed,"\t};\n","\tfile \"db.$net\";\n","};\n";
|
|
|
|
} else {
|
|
my $zfilename = $zone;
|
|
#$zfilename =~ s/\..*//;
|
|
push @newnamed,"\t};\n","\tfile \"db.$zfilename\";\n","};\n";
|
|
}
|
|
}
|
|
foreach $zone (keys %{$ctx->{adzones}}) {
|
|
if ($didzones{$zone}) { next; }
|
|
$ctx->{restartneeded}=1; #have to add a zone, a restart will be needed
|
|
push @newnamed,"zone \"$zone\" in {\n","\ttype master;\n","\tallow-update {\n","\t\tkey xcat_key;\n";
|
|
foreach (@{$ctx->{adservers}}) {
|
|
push @newnamed,"\t\t$_;\n";
|
|
}
|
|
my $zfilename = $zone;
|
|
#$zfilename =~ s/\..*//;
|
|
push @newnamed,"\t};\n","\tfile \"db.$zfilename\";\n","};\n\n";
|
|
}
|
|
my $newnameconf;
|
|
open($newnameconf,">>",$namedlocation);
|
|
flock($newnameconf,LOCK_EX);
|
|
seek($newnameconf,0,0);
|
|
truncate($newnameconf,0);
|
|
for my $l (@newnamed) { print $newnameconf $l; }
|
|
flock($newnameconf,LOCK_UN);
|
|
close($newnameconf);
|
|
chown (scalar(getpwnam('root')),scalar(getgrnam('named')),$namedlocation);
|
|
}
|
|
|
|
sub add_or_delete_records {
|
|
my $ctx = shift;
|
|
unless ($ctx->{privkey}) {
|
|
my $passtab = xCAT::Table->new('passwd');
|
|
my $pent = $passtab->getAttribs({key=>'omapi',username=>'xcat_key'},['password']);
|
|
if ($pent and $pent->{password}) {
|
|
$ctx->{privkey} = $pent->{password};
|
|
} else {
|
|
xCAT::SvrUtils::sendmsg([1,"Unable to find omapi key in passwd table"], $callback);
|
|
}
|
|
}
|
|
my $node;
|
|
my $ip;
|
|
my $domain = $ctx->{domain}; # store off for lazy typing and possible local mangling
|
|
unless ($domain =~ /^\./) { $domain = '.'.$domain; } #example.com becomes .example.com for consistency
|
|
$ctx->{nsmap} = {}; #will store a map to known NS records to avoid needless redundant queries to sort nodes into domains
|
|
$ctx->{updatesbyzone}={}; #sort all updates into their respective zones for bulk update for fewer DNS transactions
|
|
foreach $node (@{$ctx->{nodes}}) {
|
|
$ip = $node;
|
|
my $name = $node;
|
|
unless ($name =~ /$domain/) { $name .= $domain } # $name needs to represent fqdn, but must preserve $node as a nodename for cfg lookup
|
|
#if (domaintab->{$node}->[0]->{domain) { $domain = domaintab->{$node}->[0]->{domain) }
|
|
#above is TODO draft of how multi-domain support could come into play
|
|
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)) {
|
|
xCAT::SvrUtils::sendmsg([1,"Unable to find an IP for $node in hosts table or via system lookup (i.e. /etc/hosts"], $callback);
|
|
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 $entry;
|
|
my $numreqs = 300; # limit to 300 updates in a payload, something broke at 644 on a certain sample, choosing 300 for now
|
|
my $update = Net::DNS::Update->new($zone);
|
|
foreach $entry (@{$ctx->{updatesbyzone}->{$zone}}) {
|
|
if ($ctx->{deletemode}) {
|
|
$update->push(update=>rr_del($entry));
|
|
} else {
|
|
$update->push(update=>rr_add($entry));
|
|
}
|
|
$numreqs -= 1;
|
|
if ($numreqs == 0) {
|
|
$update->sign_tsig("xcat_key",$ctx->{privkey});
|
|
$numreqs=300;
|
|
my $reply = $resolver->send($update);
|
|
if ($reply->header->rcode ne 'NOERROR') {
|
|
xCAT::SvrUtils::sendmsg([1,"Failure encountered updating $zone, error was ".$reply->header->rcode], $callback);
|
|
}
|
|
$update = Net::DNS::Update->new($zone); #new empty request
|
|
}
|
|
}
|
|
if ($numreqs != 300) { #either no entries at all to begin with or a perfect multiple of 300
|
|
$update->sign_tsig("xcat_key",$ctx->{privkey});
|
|
my $reply = $resolver->send($update);
|
|
}
|
|
}
|
|
}
|
|
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 $ip" );
|
|
foreach (keys %{$ctx->{nodeips}->{$node}}) {
|
|
unless ($_ eq $ip) {
|
|
push @rrcontent,"$name IN A $_";
|
|
}
|
|
}
|
|
if ($ctx->{deletemode}) {
|
|
push @rrcontent,"$name TXT";
|
|
push @rrcontent,"$name A";
|
|
}
|
|
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
|
|
if ($zone =~ /^\.*192.IN-ADDR.ARPA\.*/ or $zone =~ /^\.*172.IN-ADDR.ARPA\.*/ or $zone =~ /127.IN-ADDR.ARPA\.*/ or $zone =~ /^\.*IN-ADDR.ARPA\.*/ or $zone =~ /^\.*ARPA\.*/) {
|
|
$ctx->{nsmap}->{$zone} = 0; #ignore zones that are likely to appear, but probably not ours
|
|
} else {
|
|
my $reply = $ctx->{resolver}->query($zone,'NS');
|
|
if ($reply) {
|
|
foreach my $record ($reply->answer) {
|
|
if ( $record->nsdname =~ /blackhole.*\.iana\.org/) {
|
|
$ctx->{nsmap}->{$zone} = 0;
|
|
} else {
|
|
$ctx->{nsmap}->{$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
|
|
push @{$ctx->{updatesbyzone}->{$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
|
|
if ($zone !~ /\./) {
|
|
xCAT::SvrUtils::sendmsg([1,"Unable to find reverse zone to hold $node"], $callback,$node);
|
|
last;
|
|
}
|
|
|
|
$zone =~ s/^[^\.]*\.//; #strip all up to and including first dot
|
|
unless ($zone) {
|
|
xCAT::SvrUtils::sendmsg([1,"Unable to find zone to hold $node"], $callback,$node);
|
|
last;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
sub genpassword
|
|
{
|
|
|
|
#Generate a pseudo-random password of specified length
|
|
my $length = shift;
|
|
my $password = '';
|
|
my $characters =
|
|
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';
|
|
srand; #have to reseed, rand is not rand otherwise
|
|
while (length($password) < $length)
|
|
{
|
|
$password .= substr($characters, int(rand 63), 1);
|
|
}
|
|
return $password;
|
|
}
|
|
1;
|