florian/sshdyndns
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do nothing if IP does not change

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Florian Obser 2017-04-25 08:43:00 +02:00
parent 3511cf93ec
commit 4227ca80ce
1 changed files with 16 additions and 4 deletions
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sshdyndns
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@ -30,6 +30,7 @@ my $help = 0;
my $tsigalgo = 'hmac-sha256'; my $tsigalgo = 'hmac-sha256';
my ($tsigname, $tsigkey, $server, $verbose, $tsig); my ($tsigname, $tsigkey, $server, $verbose, $tsig);
my ($old_rr, $new_rr, $update, $resolver, $reply, $ip); my ($old_rr, $new_rr, $update, $resolver, $reply, $ip);
my @answer;
GetOptions("help|?" => \$help, GetOptions("help|?" => \$help,
"verbose" => \$verbose, "verbose" => \$verbose,
@ -59,6 +60,21 @@ if(exists $ENV{SSH_CLIENT} &&
pod2usage(1); pod2usage(1);
} }
$resolver = new Net::DNS::Resolver(recurse => 0);
$resolver->nameservers($server);
$resolver->port($port);
$reply = $resolver->query($label, 'A');
if ($reply && $reply->header->rcode eq 'NOERROR' &&
scalar($reply->answer) == 1) {
@answer = $reply->answer;
if ($answer[0]->type eq 'A' && $answer[0]->address eq $ip) {
say 'no change, nothing to do' if ($verbose);
exit (0);
}
}
$old_rr = rr_del("$label A"); $old_rr = rr_del("$label A");
$new_rr = rr_add("$label $ttl A $ip"); $new_rr = rr_add("$label $ttl A $ip");
@ -83,10 +99,6 @@ if (defined $tsigname && defined $tsigkey) {
say $update->string if ($verbose); say $update->string if ($verbose);
$resolver = new Net::DNS::Resolver;
$resolver->nameservers($server);
$resolver->port($port);
$reply = $resolver->send($update); $reply = $resolver->send($update);
if ($reply) { if ($reply) {