ip.pm

Network Administration Visualized 网络管理可视化源码

Note that in versions prior to 3.02, if fed with the same IP subnets
multiple times, these subnets would be returned. From 3.02 on, a more
"correct" approach has been adopted and only one address would be
returned.

=item C<$me-E<gt>compactref(\@list)>

As usual, a faster version of =item C<-E<gt>compact()> that returns a
reference to a list. Note that this method takes a reference to a list
instead.

=item C<-E<gt>first()>

Returns a new object representing the first useable IP address within
the subnet (ie, the first host address).

=item C<-E<gt>last()>

Returns a new object representing the last useable IP address within
the subnet (ie, one less than the broadcast address).

=item C<-E<gt>nth($index)>

Returns a new object representing the I<n>-th useable IP address within
the subnet (ie, the I<n>-th host address).  If no address is available
(for example, when the network is too small for C<$index> hosts),
C<undef> is returned.

=item C<-E<gt>num()>

Returns the number of useable addresses IP addresses within the
subnet, not counting the broadcast address.

=back

In addition to the methods, some functions are overloaded to ease
manipulation of the objects. The available operations are:

=over

=item B<Stringification>

An object can be used just as a string. For instance, the following code

	my $ip = new NetAddr::IP 'loopback';
        print "$ip\n";

Will print the string 127.0.0.1/8.

=item B<Equality>

You can test for equality with either C<eq> or C<==>.

=item B<Dereferencing as an ARRAY>

You can do something along the lines of

	my $net = new NetAddr::IP $cidr_spec;
        for my $ip (@$net) {
	  print "Host $ip is in $net\n";
	}

However, note that this might generate a very large amount of items
in the list. You must be careful when doing this kind of expansion.

=item B<Sum and auto-increment>

You can add a constant to an object. This will return a new object
referring to the host address obtained by incrementing (or
decrementing) the given address. YOu can do this with the operators
B<+>, B<->, B<+=> and B<-=>.

The auto-increment or auto-decrement operators will return a new
object pointing to the next or previous host address in the
subnet. These are the B<++> and B<--> operators.

=back

=head2 EXPORT

None by default.


=head1 HISTORY

=over

=item 0.01

=over


=item *

original  version;  Basic testing  and  release  to CPAN  as
version 0.01. This is considered beta software.

=back


=item 0.02

=over


=item *

Multiple changes  to fix endiannes issues. This  code is now
moderately tested on Wintel and Sun/Solaris boxes.

=back


=item 0.03

=over


=item *

Added -E<gt>first and -E<gt>last methods. Version changed to 0.03.

=back


=item 1.00

=over


=item *

Implemented -E<gt>new_subnet. Version changed to 1.00.

=item *

less croak()ing when improper input  is fed to the module. A
more consistent 'undef' is returned now instead to allow the
user to better handle the error.

=back


=item 1.10

=over


=item *

As  per  Marnix   A.   Van  Ammers  [[e-mail]]
suggestion, changed  the syntax of the loop  in host_enum to
be the same of the enum method.

=item *

Fixed the MS-DOS ^M  at the end-of-line problem. This should
make the module easier to use for *nix users.

=back


=item 1.20

=over


=item *

Implemented -E<gt>compact and -E<gt>expand methods.

=item *

Applying for official name

=back


=item 1.21

=over


=item *

Added  -E<gt>addr_number and  -E<gt>mask_bits.  Currently  we return
normal  numbers (not  BigInts).   Please test  this in  your
platform and report any problems!

=back


=item 2.00

=over


=item *

Released under the new *official* name of NetAddr::IP

=back


=item 2.10

=over


=item *

Added support for -E<gt>new($min, $max, $bits) form

=item *

Added -E<gt>to_numeric. This helps serializing objects

=back


=item 2.20

=over


=item *

Chris Dowling  reported that  the sort method  introduced in
v1.20  for -E<gt>expand  and -E<gt>compact  doesn't always  return a
number under perl versions < 5.6.0.  His fix was applied and
redistributed.  Thanks Chris!

=item *

This module is hopefully released with no CR-LF issues!

=item *

Fixed a warning about uninitialized values during make test

=back


=item 2.21

=over


=item *

Dennis  Boylan pointed  out a  bug under  Linux  and perhaps
other platforms  as well causing the  error "Sort subroutine
didn't         return         single        value         at
/usr/lib/perl5/site_perl/5.6.0/NetAddr/IP.pm  line  299,  E<lt>E<gt>
line 2." or similar. This was fixed.

=back


=item 2.22

=over


=item *

Some changes  suggested by Jeroen Ruigrok  and Anton Berezin
were included. Thanks guys!

=back


=item 2.23

=over


=item *

Bug fix for /XXX.XXX.XXX.XXX netmasks under v5.6.1 suggested
by Tim Wuyts. Thanks!

=item *

Tested the module under MACHTYPE=hppa1.0-hp-hpux11.00. It is
now  konwn to  work  under Linux  (Intel/AMD), Digital  Unix
(Alpha),   Solaris  (Sun),  HP-UX11   (HP-PA-RISC),  Windows
9x/NT/2K (using ActiveState on Intel).

=back


=item 2.24

=over


=item *

A spurious  warning when  expand()ing with -w  under certain
circumstances  was removed. This  involved using  /31s, /32s
and the same netmask as the input.  Thanks to Elie Rosenblum
for pointing it out.

=item *

Slight change  in license terms to ease  redistribution as a
Debian package.

=back


=item 3.00

=over

This is  a major rewrite, supposed  to fix a number  of issues pointed
out in earlier versions.

The goals for this version include getting rid of BigInts, speeding up
and also  cleaning up the code,  which is written in  a modular enough
way so  as to allow IPv6  functionality in the  future, taking benefit
from most of the methods.

Note that no effort has  been made to remain backwards compatible with
earlier versions. In particular, certain semantics of the earlier
versions have been removed in favor of faster performance.

This  version  was tested  under  Win98/2K (ActiveState  5.6.0/5.6.1),
HP-UX11 on PA-RISC (5.6.0), RedHat  Linux 6.2 (5.6.0), Digital Unix on
Alpha (5.6.0), Solaris on Sparc (5.6.0) and possibly others.

=back

=item 3.01

=over

=item * 

Added C<-E<gt>numeric()>.

=item *

C<-E<gt>new()> called with no parameters creates a B<default>
NetAddr::IP object.

=back

=item 3.02

=over

=item *

Fxed C<-E<gt>compact()> for cases of equal subnets or
mutually-contained IP addresses as pointed out by Peter Wirdemo. Note
that now only distinct IP addresses will be returned by this method.

=item *

Fixed the docs as suggested by Thomas Linden.

=item *

Introduced overloading to ease certain common operations.

=item *

    Fixed compatibility issue with C<-E<gt>num()> on 64-bit processors.

=back

=item 3.03

=over

=item *

Added more comparison operators.

=item *

As per Peter Wirdemo's suggestion, added C<-E<gt>wildcard()> for
producing subnets in wildcard format.

=item *

Added C<++> and C<+> to provide for efficient iteration operations
over all the hosts of a subnet without C<-E<gt>expand()>ing it.

=back

=item 3.04

=over

=item *

Got rid of C<croak()> when invalid input was fed to C<-E<gt>new()>.

=item *

As suggested by Andrew Gaskill, added support for prefix
notation. Thanks for the code of the initial C<-E<gt>prefix()>
function.

=back

=item 3.05

=over

=item *

Added support for range notation, where base and broadcast addresses
are given as arguments to C<-E<gt>new()>.

=back

=item 3.06

=over

=item *

Andrew Ruthven pointed out a bug related to proper interpretation of
"compact" CIDR blocks. This was fixed. Thanks!

=back

=item 3.07

=over

=item *

Sami Pohto pointed out a bug with C<-E<gt>last()>. This was fixed.

=item *

A small bug related to parsing of 'localhost' was fixed.

=back

=item 3.08

=over

=item *

By popular request, C<-E<gt>new()> now checks the sanity of the netmasks
it receives. If the netmask is invalid, C<undef> will be returned.

=back

=item 3.09

=over

=item *

Fixed typo that invalidated otherwise correct masks. This bug appeared in 3.08.

=back

=item 3.10

=over

=item *

Fixed relops. Semantics where adjusted to remove the netmask from the
comparison. (ie, it does not make sense to say that 10.0.0.0/24 is >
10.0.0.0/16 or viceversa).

=back

=item 3.11

=over

=item *

Thanks to David D. Zuhn for contributing the C<-E<gt>nth()> method.

=item *

tutorial.htm now included in the  distribution. I hope this helps some
people to better  understand what kind of stuff can  be done with this
module.

=item *

C<'any'> can be used as a synonim of C<'default'>. Also, C<'host'> is
now a valid (/32) netmask.

=back

=back

=head1 AUTHOR

Luis E. Munoz <[e-mail]>

=head1 WARRANTY

This software comes with the  same warranty as perl itself (ie, none),
so by using it you accept any and all the liability.

=head1 LICENSE

This software is (c) Luis E. Munoz.  It can be used under the terms of
the perl artistic license provided  that proper credit for the work of
the  author is  preserved in  the form  of this  copyright  notice and
license for this module.

=head1 SEE ALSO

perl(1).

=cut