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#!/usr/bin/perl -w |
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|
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# Script to dynamically update DNS entry for hostname of this box |
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|
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use strict; |
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use Net::DNS; |
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use Sys::Syslog; |
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use Sys::Hostname; |
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use File::Basename; |
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|
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my $domain = "dyn.andrew.net.au"; |
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my $key_name = "updatekey"; |
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my $key = "RttHZIREBzkqIUi+jJw2mg=="; |
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|
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my $RC = 0; |
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my $hostname = hostname; |
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my $fqdn = "${hostname}.${domain}"; |
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|
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my $res = Net::DNS::Resolver->new; |
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|
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openlog(basename($0), "pid", "user"); |
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|
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syslog("info", "interface = $ENV{'PPP_IFACE'}") if ($ENV{'PPP_IFACE'}); |
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syslog("info", "tty = $ENV{'PPP_TTY'}") if ($ENV{'PPP_TTY'}); |
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syslog("info", "speed = $ENV{'PPP_SPEED'}") if ($ENV{'PPP_SPEED'}); |
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syslog("info", "local = $ENV{'PPP_LOCAL'}") if ($ENV{'PPP_LOCAL'}); |
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syslog("info", "remote = $ENV{'PPP_REMOTE'}") if ($ENV{'PPP_REMOTE'}); |
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syslog("info", "ipparam = $ENV{'PPP_IPPARAM'}") if ($ENV{'PPP_IPPARAM'}); |
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|
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if ($ENV{'PPP_IFACE'} ne "ppp0") { |
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syslog("info", "Assuming this is not the first PPP connection, exiting..."); |
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exit 0; |
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} |
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|
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if ($ENV{'PPP_LOCAL'}) { |
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my $query = $res->search($domain, "SOA"); |
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if ($query) { |
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my $nameserver = ($query->answer)[0]; |
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$nameserver = $nameserver->mname; |
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|
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my $update = new Net::DNS::Update($domain); |
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$update->push("pre", yxrrset("${fqdn} A")); |
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$update->push("update", rr_del("${fqdn} A")); |
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$update->sign_tsig($key_name, $key); |
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|
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$res->nameservers($nameserver); |
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my $reply = $res->send($update); |
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|
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if (defined $reply) { |
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if ($reply->header->rcode eq "NOERROR") { |
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syslog("info", "A record deletion succeeded"); |
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} else { |
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syslog("info", "A record deletion failed: " . $reply->header->rcode); |
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} |
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} else { |
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syslog("info", "A record deletion failed: " . $res->errorstring); |
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} |
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|
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$update = new Net::DNS::Update($domain); |
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$update->push("pre", nxrrset("${fqdn} A")); |
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$update->push("update", rr_add("${fqdn}. 300 A $ENV{'PPP_LOCAL'}")); |
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$update->sign_tsig($key_name, $key); |
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|
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$reply = $res->send($update); |
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|
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if (defined $reply) { |
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if ($reply->header->rcode eq "NOERROR") { |
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syslog("info", "A record addition for $ENV{'PPP_LOCAL'} succeeded"); |
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} else { |
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syslog("info", "A record addition for $ENV{'PPP_LOCAL'} failed: " . $reply->header->rcode); |
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} |
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} else { |
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print "Addition failed: ", $res->errorstring, "\n"; |
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syslog("info", "A record addition for $ENV{'PPP_LOCAL'} failed: " . $res->errorstring); |
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} |
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|
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} else { |
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syslog("info", "Unable to determine primary nameserver for $domain"); |
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$RC = 2; |
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} |
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} else { |
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print "PPP_LOCAL environment variable not set\n"; |
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syslog("info", "PPP_LOCAL environment variable not set"); |
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$RC = 1; |
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} |
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|
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closelog(); |
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|
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exit($RC); |
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