Net::DNS::Nameserver(3) 				User Contributed Perl Documentation				   Net::DNS::Nameserver(3)

NAME

       Net::DNS::Nameserver - DNS server class

SYNOPSIS

       "use Net::DNS::Nameserver;"

DESCRIPTION

       Instances of the "Net::DNS::Nameserver" class represent simple DNS server objects.  See "EXAMPLE" for an example.

METHODS

       new

	       my $ns = Net::DNS::Nameserver->new(
	       LocalAddr	=> "10.1.2.3",
	       LocalPort	=> "5353",
	       ReplyHandler => &reply_handler,
	       Verbose		=> 1
	       );

       Creates a nameserver object.  Attributes are:

	 LocalAddr	       IP address on which to listen.  Defaults to INADDR_ANY.
	 LocalPort	       Port on which to listen.  Defaults to 53.
	 ReplyHandler  Reference to reply-handling subroutine.	Required.
	 Verbose	       Print info about received queries.      Defaults to 0 (off).

       The ReplyHandler subroutine is passed the query name, query class, and query type.      It must return the response code and references to
       the answer, authority, and additional sections of the response.	Common response codes are:

	 NOERROR       No error
	 FORMERR       Format error
	 SERVFAIL      Server failure
	 NXDOMAIN      Non-existent domain (name doesn't exist)
	 NOTIMP        Not implemented
	 REFUSED       Query refused

       See RFC 1035 and the IANA dns-parameters file for more information:

	 ftp://ftp.rfc-editor.org/in-notes/rfc1035.txt
	 http://www.isi.edu/in-notes/iana/assignments/dns-parameters

       The nameserver will listen for both UDP and TCP connections.  On Unix-like systems, the program will probably have to run as root to listen
       on the default port, 53.  A non-privileged user should be able to listen on ports 1024 and higher.

       Returns a Net::DNS::Nameserver object, or undef if the object couldn't be created.

       See "EXAMPLE" for an example.

       main_loop

	       $ns->main_loop;

       Start accepting queries.

EXAMPLE

       The following example will listen on port 5353 and respond to all queries for A records with the IP address 10.1.2.3.   All other queries
       will be answered with NXDOMAIN.	 Authority and additional sections are left empty.

	 #!/usr/bin/perl -Tw

	 use Net::DNS;
	 use strict;

	 sub reply_handler {
		 my ($qname, $qclass, $qtype) = @_;
		 my ($rcode, @ans, @auth, @add);

		 if ($qtype eq "A") {
		       my ($ttl, $rdata) = (3600, "10.1.2.3");
		       push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata");
		       $rcode = "NOERROR";
		 }
		 else {
		       $rcode = "NXDOMAIN";
		 }

		 return ($rcode, @ans, @auth, @add);
	 }

	 my $ns = Net::DNS::Nameserver->new(
		 LocalPort	  => 5353,
		 ReplyHandler => &reply_handler,
		 Verbose	  => 1
	 );

	 if ($ns) {
		 $ns->main_loop;
	 }
	 else {
		 die "couldn't create nameserver object
";
	 }

BUGS

       Net::DNS::Nameserver objects can handle only one query at a time.

COPYRIGHT

       Copyright (c) 2000-2002 Michael Fuhr.  All rights reserved. This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.

SEE ALSO

       perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::Question, Net::DNS::RR, RFC 1035

perl v5.8.0							    2002-05-31						   Net::DNS::Nameserver(3)