108 lines
2.0 KiB
Perl
108 lines
2.0 KiB
Perl
package Martnet::DDNS;
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use strict;
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use warnings;
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use Net::DNS;
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use File::Temp qw/tempfile/;
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our $VERSION = '0.1';
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sub new {
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my $me = shift;
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my %opts = @_;
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return bless {
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'keyfile' => '/etc/bind/Kprivate.invalid.+157+14348.key',
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%opts
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}, $me;
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}
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sub _fqdn {
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my ($dom) = @_;
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return $dom . "_vhosts.private.invalid.";
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}
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sub _validateOrDie {
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my ($dom) = @_;
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die "No domain provided"
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unless $dom;
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die "Invalid domain name (must end in a dot)"
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unless ($dom =~ /^[a-zA-Z0-9\.]+\.$/);
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}
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sub _lookupOrDie {
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my ($dom) = @_;
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_validateOrDie($dom);
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my $fqdn = _fqdn($dom);
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my $res = Net::DNS::Resolver->new;
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my $query = $res->query($fqdn, "TXT");
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if ($query) {
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foreach my $rr (grep { $_->type eq 'TXT' } $query->answer) {
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# We found a record; that's all that I care about.
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#print $rr->nsdname, "\n";
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return 1;
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}
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}
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else {
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die "query failed: ", $res->errorstring, "\n";
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}
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die "Failed to find existing DNS record for $fqdn";
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}
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sub __docmd {
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my ($this, $cmd) = @_;
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my ($tmpfh, $filename) = tempfile();
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close $tmpfh;
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my $fh;
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open($fh, "|nsupdate -d -k $this->{keyfile} > $filename")
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|| die "Can't open nsupdate: $!";
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print $fh "server localhost\nzone private.invalid.\n$cmd\nshow\nsend\n";
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close $fh;
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open($fh, $filename) || die "Can't re-open tmpfile $filename: $!";
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while (<$fh>) {
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print;
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}
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close $fh;
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unlink $filename;
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}
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# Add a new vhost domain by adding a DDNS record that the slaves will notice.
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sub addvhost {
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my ($this, $dom, $master) = @_;
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_validateOrDie($dom);
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my $fqdn = _fqdn($dom);
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$this->__docmd("update add $fqdn 60 TXT $master");
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$this->cleanup();
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}
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sub delvhost {
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my ($this, $dom) = @_;
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_lookupOrDie($dom);
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my $fqdn = _fqdn($dom);
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$this->__docmd("update delete $fqdn TXT");
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$this->cleanup();
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}
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sub cleanup {
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my ($this) = @_;
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# Merge the .jnl file in with the domain file
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system("rndc sync -clean private.invalid");
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}
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1;
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