###################################################################### DNS::ZoneParse 0.99 ###################################################################### NAME DNS::ZoneParse - Parse and manipulate DNS Zone Files. SYNOPSIS use DNS::ZoneParse; my $zonefile = DNS::ZoneParse->new("/path/to/dns/zonefile.db", $origin); # 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 my $newzone; open($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, HINFO, and RP. 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 zone file. DNS::ZoneParse scans the DNS zone file - removes comments and seperates the file into its 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 zone file. 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 ); You can pass a second, optional parameter to the constructor to supply an $origin if none can be found in the zone file. my $zonefile = DNS::ZoneParse->new( \$zone_contents, $origin ); You can pass a third, optional parameter to the constructor to supply a callback which will be called whenever an unparsable line is encountered in the zone file. See "on_unparseable_line" for details on this parameter and how errors are handled when parsing zone files. If you plan to pass a on_unparseable_line callback but do not wish to specify an $origin, pass 'undef' as the $origin parameter. a(), cname(), srv(), mx(), ns(), ptr(), txt(), hinfo(), rp(), loc() These methods return references to the resource records. For example: my $mx = $zonefile->mx; Returns the mx records in an array reference. All records have the following properties: 'ttl', 'class', 'host', 'name'. MX records also have a 'priority' property. SRV records also have 'priority', 'weight' and 'port' properties. TXT records also have a 'text' property representing the record's "txt-data" descriptive text. HINFO records also have 'cpu' and 'os' properties. RP records also have 'mbox' and 'text' properties. LOC records also have 'd1', 'm1', 's1', 'NorS', 'd2', 'm2', 's2', 'EorW', 'alt', 'siz', 'hp', and 'vp', as per RFC 1876. If there are no records of a given type in the zone, the call will croak with an error message about an invalid method. (This is not an ideal behavior, but has been kept for backwards compatibility.) 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 zone file output as a string. If you wish your output formatted differently, you can pass the output of "dump()" to your favourite templating module. last_parse_error_count Returns a count of the number of unparsable lines from the last time a zone file was parsed. If no zone file has been parsed yet, returns 0. If you want to be sure that a zone file was parsed completely and without error, the return value of this method should be checked after the constructor is called (or after a call to _parse). on_unparseable_line "on_unparseable_line()" is an accessor method for the callback used when an unparseable line is encountered while parsing a zone file. If not set, DNS::ZoneParse will "croak" when an unparsable line is encountered, but will continue to parse the file. Each time an unparsable line is encountered, an internal counter is incrememnted. See "last_parse_error_count" for details. If you want to abort parsing when an unparsable line is found, call "die" from within your callback and catch that die with an eval block around the DNS::ZoneParse constructor (or call to _parse). Takes a single optional parameter, a code reference to the function that will be called when an unparsable line is reached. This code reference will be passed two parameters, the first is a reference to the DNS::ZoneParse object that is parsing the file, and the second is the text of the line that could not be parsed. Returns a reference to the last callback. If passed an undefined value, a reference to the current callback is returned. If passed any other value, undef is returned. 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 Zone file 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 API The DNS::ZoneParse API may change in future versions. At present, the parsing is not as strict as it should be and support for $ORIGIN and $TTL is quite basic. It would also be nice to support the "INCLUDE" statement. Furthermore, parsing large zone files with thousands of records can use lots of memory - some people have requested a callback interface. BUGS I can squash more bugs with your help. Please let me know if you spot something that doesn't work as expected. You can report bugs via the CPAN RT: If possible, please provide a diff against t/dns-zoneparse.t and t/test-zone.db that demonstrates the bug(s). SEE ALSO Other modules with similar functionality: Net::DNS::ZoneParser, Net::DNS::ZoneFile, DNS::ZoneFile AUTHOR Simon Flack MAINTENANCE Maintainers: Mike Schilli (m@perlmeister.com), John Eaglesham (perl@8192.net). Bug queue: http://rt.cpan.org/Public/Dist/Display.html?Name=DNS-ZoneParse LICENSE DNS::ZoneParse is free software which you can redistribute and/or modify under the same terms as Perl itself.