NAME
Data::Validate::IP - ip validation methods
SYNOPSIS
use Data::Validate::IP qw(is_ipv4);
if(is_ipv4($suspect)){
print "Looks like an ip address";
} else {
print "Not an ip address\n";
}
# or as an object
my $v = Data::Validate::IP->new();
die "not an ip" unless ($v->is_ipv4('domain.com'));
DESCRIPTION
This module collects ip validation routines to make input validation,
and untainting easier and more readable.
All functions return an untainted value if the test passes, and undef if
it fails. This means that you should always check for a defined status
explicitly. Don't assume the return will be true. (e.g.
is_username('0'))
The value to test is always the first (and often only) argument.
FUNCTIONS
new - constructor for OO usage
$obj = Data::Validate::IP->new();
*Description*
Returns a Data::Validator::IP object. This lets you access all
the validator function calls as methods without importing them
into your namespace or using the clumsy
Data::Validate::IP::function_name() format.
*Arguments*
None
*Returns*
Returns a Data::Validate::IP object
is_ipv4 - does the value look like an ip v4 address?
is_ipv4($value);
or
$obj->is_ipv4($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists. It only looks to see that the format is
appropriate.
is_ipv6 - does the value look like an ip v6 address?
is_ipv6($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists. It only looks to see that the format is
appropriate.
is_private_ipv4 - is it a valid private ipv4 address
is_private_ipv4($value);
or
$obj->is_private_ipv4($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed private ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 3330*
10.0.0.0/8 - This block is set aside for use in private networks.
Its intended use is documented in [RFC1918]. Addresses within this
block should not appear on the public Internet.
172.16.0.0/12 - This block is set aside for use in private networks.
Its intended use is documented in [RFC1918]. Addresses within this
block should not appear on the public Internet.
192.168.0.0/16 - This block is set aside for use in private networks.
Its intended use is documented in [RFC1918]. Addresses within this
block should not appear on the public Internet.
is_loopback_ipv4 - is it a valid loopback ipv4 address
is_loopback_ipv4($value);
or
$obj->is_loopback_ipv4($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed loopback ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 3330*
127.0.0.0/8 - This block is assigned for use as the Internet host
loopback address. A datagram sent by a higher level protocol to an
address anywhere within this block should loop back inside the host.
This is ordinarily implemented using only 127.0.0.1/32 for loopback,
but no addresses within this block should ever appear on any network
anywhere [RFC1700, page 5].
is_testnet_ipv4 - is it a valid testnet ipv4 address
is_testnet_ipv4($value);
or
$obj->is_testnet_ipv4($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed testnet ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 3330*
192.0.2.0/24 - This block is assigned as "TEST-NET" for use in
documentation and example code. It is often used in conjunction with
domain names example.com or example.net in vendor and protocol
documentation. Addresses within this block should not appear on the
public Internet.
is_multicast_ipv4 - is it a valid multicast ipv4 address
is_multicast_ipv4($value);
or
$obj->is_multicast_ipv4($value);
*Description*
Returns the untainted ip addres if the test value appears to be
a well-formed multicast ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 3330*
224.0.0.0/4 - This block, formerly known as the Class D address
space, is allocated for use in IPv4 multicast address assignments.
The IANA guidelines for assignments from this space are described in
[RFC3171].
is_linklocal_ipv4 - is it a valid link-local ipv4 address
is_linklocal_ipv4($value);
or
$obj->is_linklocal_ipv4($value);
*Description*
Returns the untainted ip addres if the test value appears to be
a well-formed link-local ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 3330*
169.254.0.0/16 - This is the "link local" block. It is allocated for
communication between hosts on a single link. Hosts obtain these
addresses by auto-configuration, such as when a DHCP server may not
be found.
is_linklocal_ipv6 - is it a valid link-local ipv6 address
is_linklocal_ipv6($value);
or
$obj->is_linklocal_ipv6($value);
*Description*
Returns the untainted ip addres if the test value appears to be
a well-formed link-local ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists.
*From RFC 2462*
A link-local address is formed by prepending the well-known link-
local prefix FE80::0 [ADDR-ARCH] (of appropriate length) to the
interface identifier. If the interface identifier has a length of N
bits, the interface identifier replaces the right-most N zero bits of
the link-local prefix. If the interface identifier is more than 118
bits in length, autoconfiguration fails and manual configuration is
required. Note that interface identifiers will typically be 64-bits
long and based on EUI-64 identifiers as described in [ADDR-ARCH].
is_public_ipv4 - is it a valid public ipv4 address
is_public_ipv4($value);
or
$obj->is_public_ipv4($value);
*Description*
Returns the untainted ip address if the test value appears to be
a well-formed public ip address.
*Arguments*
$value
The potential ip to test.
*Returns*
Returns the untainted ip on success, undef on failure.
*Notes, Exceptions, & Bugs*
The function does not make any attempt to check whether an ip
actually exists or could truly route. This is true for any non-
private/testnet/loopback ip.
SEE ALSO
IPv4
b<[RFC 3330] [RFC 1918] [RFC 1700]>
IPv6
b<[RFC 2460] [RFC 4291] [RFC 4294]>
Data::Validate(3)
IPv6
IPv6 Support is new, please test it thoroughly and report any bugs.
AUTHOR
Neil Neely <neil@neely.cx>.
ACKNOWLEDGEMENTS
Thanks to Richard Sonnen <sonnen@richardsonnen.com> for writing the
Data::Validate module.
Thanks to Matt Dainty <matt@bodgit-n-scarper.com> for adding the
is_multicast_ipv4 and is_linklocal_ipv4 code.
COPYRIGHT AND LICENSE
Copyright (c) 2005-2009 Neil Neely.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either Perl version 5.8.2 or, at
your option, any later version of Perl 5 you may have available.