modules/pipebackend/backend.pl

   1 #!/usr/bin/perl -w
   2 # sample PowerDNS Coprocess backend
   3 #
   4
   5 use strict;
   6
   7
   8 $|=1;                                   # no buffering
   9
  10 my $line=<>;
  11 chomp($line);
  12
  13 unless($line eq "HELO\t1") {
  14         print "FAIL\n";
  15         print STDERR "Received '$line'\n";
  16         <>;
  17         exit;
  18 }
  19 print "OK       Sample backend firing up\n";    # print our banner
  20
  21 while(<>)
  22 {
  23         print STDERR "$$ Received: $_";
  24         chomp();
  25         my @arr=split(/\t/);
  26         if(@arr<6) {
  27                 print "LOG      PowerDNS sent unparseable line\n";
  28                 print "FAIL\n";
  29                 next;
  30         }
  31
  32         # note! the qname is what PowerDNS asks the backend. It need not be what the internet asked PowerDNS!
  33         my ($type,$qname,$qclass,$qtype,$id,$ip)=split(/\t/);
  34
  35         if(($qtype eq "SOA" || $qtype eq "ANY") && $qname eq "example.com") {
  36                 print STDERR "$$ Sent SOA records\n";
  37                 print "DATA     $qname  $qclass SOA     3600    -1      ns1.example.com ahu.example.com 2008080300 1800 3600 604800 3600\n";
  38         }
  39         if(($qtype eq "NS" || $qtype eq "ANY") && $qname eq "example.com") {
  40                 print STDERR "$$ Sent NS records\n";
  41                 print "DATA     $qname  $qclass NS      3600    -1      ns1.example.com\n";
  42                 print "DATA     $qname  $qclass NS      3600    -1      ns2.example.com\n";
  43         }
  44         if(($qtype eq "TXT" || $qtype eq "ANY") && $qname eq "example.com") {
  45                 print STDERR "$$ Sent NS records\n";
  46                 print "DATA     $qname  $qclass TXT     3600    -1      \"hallo allemaal!\"\n";
  47         }
  48         if(($qtype eq "A" || $qtype eq "ANY") && $qname eq "webserver.example.com") {
  49                 print STDERR "$$ Sent A records\n";
  50                 print "DATA     $qname  $qclass A       3600    -1      1.2.3.4\n";
  51                 print "DATA     $qname  $qclass A       3600    -1      1.2.3.5\n";
  52                 print "DATA     $qname  $qclass A       3600    -1      1.2.3.6\n";
  53         }
  54         elsif(($qtype eq "CNAME" || $qtype eq "ANY") && $qname eq "www.example.com") {
  55                 print STDERR "$$ Sent CNAME records\n";
  56                 print "DATA     $qname  $qclass CNAME   3600    -1      webserver.example.com\n";
  57         }
  58
  59
  60         print STDERR "$$ End of data\n";
  61         print "END\n";
  62 }
  63