NAME

DNS::ZoneParse - Perl extension for parsing and manipulating DNS Zone Files.

SYNOPSIS

use DNS::ZoneParse;

my $zonefile = DNS::ZoneParse->new("/path/to/dns/zonefile.db");

# Get a reference to the MX records
my $mx = $zonefile->mx;

# Change the first mailserver on the list
$mx->[0] = { host => 'mail.localhost.com',
             priority => 10,
             name => '@' };

# update the serial number
$zonefile->new_serial();

# write the new zone file to disk 
open NEWZONE, ">/path/to/dns/zonefile.db" or die "error";
print NEWZONE $zonefile->output();
close NEWZONE;

INSTALLATION

perl Makefile.PL
make
make test
make install

Win32 users substitute "make" with "nmake" or equivalent. nmake is available at http://download.microsoft.com/download/vc15/Patch/1.52/W95/EN-US/Nmake15.exe

DESCRIPTION

This module will parse a Zone File and put all the Resource Records (RRs) into an anonymous hash structure. At the moment, the following types of RRs are supported: SOA, NS, MX, A, CNAME, TXT, PTR. It could be useful for maintaining DNS zones, or for transferring DNS zones to other servers. If you want to generate an XML-friendly version of your zone files, it is easy to use XML::Simple with this module once you have parsed the zonefile.

DNS::ZoneParse scans the DNS zonefile - removes comments and seperates the file into it's constituent records. It then parses each record and stores the records internally. See below for information on the accessor methods.

METHODS

new

This creates the DNS::ZoneParse Object and loads the zonefile

Example: my $zonefile = DNS::ZoneParse->new("/path/to/zonefile.db");

You can also initialise the object with the contents of a file: my $zonefile = DNS::ZoneParse->new( \$zone_contents );

a(), cname(), mx(), ns(), ptr()

These methods return references to the resource records. For example:

my $mx = $zonefile->mx;

Returns the mx records in an array reference.

A, CNAME, NS, MX and PTR records have the following properties: 'ttl', 'class', 'host', 'name'

MX records also have a 'priority' property.

soa()

Returns a hash reference with the following properties: 'serial', 'origin', 'primary', 'refresh', 'retry', 'ttl', 'minimumTTL', 'email', 'expire'

dump

Returns a copy of the datastructute that stores all the resource records. This might be useful if you want to quickly transform the data into another format, such as XML.

new_serial

new_serial() incriments the Zone serial number. It will generate a date-based serial number. Or you can pass a positive number to add to the current serial number.

Examples:

$zonefile->new_serial();    # generates a new serial number based on date:
                           # YYYYmmddHH format, incriments current serial
                           # by 1 if the new serial is still smaller

$zonefile->new_serial(50);  # adds 50 to the original serial number

output

output() returns the new zonefile output as a string. If you wish your output formatted differently, you can pass the output of dump() to your favourite templating module.

EXAMPLES

This script will print the A records in a zone file, add a new A record for the name "new" and then return the zone file.

use strict;
use DNS::ZoneParse;

my $zonefile = DNS::ZoneParse->new("/path/to/zonefile.db");

print "Current A Records\n";
my $a_records = $zonefile->a();

foreach my $record (@$a_records) {
    print "$record->{name} resolves at $record->{host}\n";
}

push (@$a_records, { name => 'new', class => 'IN',
                     host => '127.0.0.1', ttl => '' });

$zonefile->new_serial();
my $newfile = $zonefile->output();

This script will convert a DNS Zonefile to an XML file using XML::Simple.

use strict;
use DNS::ZoneParse;
use XML::Simple;

my $zonefile = DNS::ZoneParse->new("/path/to/zonefile.db");

my $new_xml = XMLout($zonefile->dump,
                     noattr => 1,
                     suppressempty => 1,
                     rootname => $zonefile->origin);

CHANGES

see Changes

TODO

Rewrite parser - Parse::RecDescent maybe?

User-supplied callbacks on record parse

EXPORT

None by default. Object-oriented interface.

AUTHOR

S. Flack

LICENSE

DNS::ZoneParse is free software which you can redistribute and/or modify under the same terms as Perl itself.

SEE ALSO

DNS::ZoneFile