NAME

       Net::MAC::Vendor - look up the vendor for a MAC

SYNOPSIS

               use Net::MAC::Vendor;

               my $mac = "00:0d:93:29:f6:c2";

               my $array = Net::MAC::Vendor::lookup( $mac );

       You can also run this as a script with as many arguments as you like. The module realizes
       it is a script, looks up the information for each MAC, and outputs it.

               perl Net/MAC/Vendor.pm 00:0d:93:29:f6:c2 00:0d:93:29:f6:c5

DESCRIPTION

       The Institute of Electrical and Electronics Engineers (IEEE) assigns an Organizational
       Unique Identifier (OUI) to manufacturers of network interfaces. Each interface has a Media
       Access Control (MAC) address of six bytes. The first three bytes are the OUI.

       This module allows you to take a MAC address and turn it into the OUI and vendor
       information. You can, for instance, scan a network, collect MAC addresses, and turn those
       addresses into vendors. With vendor information, you can often guess at what what you are
       looking at (e.g. an Apple product).

       You can use this as a module as its individual functions, or call it as a script with a
       list of MAC addresses as arguments. The module can figure it out.

       This module tries to persistently cache with DBM::Deep the OUI information so it can avoid
       using the network. If it cannot load DBM::Deep, it uses a normal hash (which is lost when
       the process finishes). You can preload this cache with the "load_cache()" function.  So
       far, the module looks in the current working directory for a file named mac_oui.db to find
       the cache. I need to come up with a way to let the user set that location.

   Functions
       run( @macs )
           If I call this module as a script, this class method automatically runs. It takes the
           MAC addresses and prints the registered vendor information for each address. I can
           pass it a list of MAC addresses and run() processes each one of them. It prints out
           what it discovers.

           This method does try to use a cache of OUI to cut down on the times it has to access
           the network. If the cache is fully loaded (perhaps using "load_cache"), it may not
           even use the network at all.

       lookup( MAC )
           Given the MAC address, return an anonymous array with the vendor information. The
           first element is the vendor name, and the remaining elements are the address lines.
           Different records may have different numbers of lines, although the first two should
           be consistent.

           The "normalize_mac()" function explains the possible formats for MAC.

       normalize_mac( MAC )
           Takes a MAC address and turns it into the form I need to send to the IEEE lookup,
           which is the first six bytes in hex separated by hyphens. For instance,
           00:0d:93:29:f6:c2 turns into 00-0D-93.

           The input string can be a separated by colons or hyphens. They can omit leading 0's
           (which might make things look odd). We only need the first three bytes

                   00:0d:93:29:f6:c2   # usual form

                   00-0d-93-29-f6-c2   # with hyphens

                   00:0d:93            # first three bytes

                   0:d:93              # missing leading zero

                   :d:93               # missing all leading zeros

       fetch_oui( MAC )
           Looks up the OUI information on the IEEE website, or uses a cached version of it. Pass
           it the result of "normalize_mac()" and you should be fine.

           The "normalize_mac()" function explains the possible formants for MAC.

           To avoid multiple calls on the network, use "load_cache" to preload the entire OUI
           space into an in-memory cache. This can take a long time over a slow network, though;
           the file is about 60,000 lines.

       fetch_oui_from_ieee( MAC )
           Looks up the OUI information on the IEEE website. Pass it the result of
           "normalize_mac()" and you should be fine.

           The "normalize_mac()" function explains the possible formants for MAC.

       fetch_oui_from_cache( MAC )
           Looks up the OUI information in the cached OUI information (see "load_cache").

           The "normalize_mac()" function explains the possible formats for MAC.

           To avoid multiple calls on the network, use "load_cache" to preload the entire OUI
           space into an in-memory cache.

           If it doesn't find the MAC in the cache, it returns nothing.

       extract_oui_from_html( HTML, OUI )
           Gets rid of the HTML around the OUI information. It may still be ugly. The HTML is the
           search results page of the IEEE ouisearch lookup.

           Returns false if it could not extract the information. This could mean unexpected
           input or a change in format.

       parse_oui( STRING )
           Takes a string that looks like this:

                   00-03-93   (hex)            Apple Computer, Inc.
                   000393     (base 16)        Apple Computer, Inc.
                                                                           20650 Valley Green Dr.
                                                                           Cupertino CA 95014
                                                                           UNITED STATES

           and turns it into an array of lines. It discards the first line, strips the leading
           information from the second line, and strips the leading whitespace from all of the
           lines.

           With no arguments, it returns an empty anonymous array.

       load_cache( [ SOURCE ] )
           Downloads the current list of all OUIs, parses it with "parse_oui()", and stores it in
           $Cached anonymous hash keyed by the OUIs (i.e.  00-0D-93). The "fetch_oui()" will use
           this cache if it exists.

           By default, this uses "http://standards.ieee.org/regauth/oui/oui.txt", but given an
           argument, it tries to use that. To load from a local file, use the "file://" scheme.

           If "load_cache" cannot load the data, it issues a warning and returns nothing.

           This previously used DBM::Deep if it was installed, but that was much too slow.
           Instead, if you want persistence, you can play with $Net::MAC::Vendor::Cached
           yourself.

SEE ALSO

       Net::MacMap

SOURCE AVAILABILITY

       The source is in Github:

               git://github.com/briandfoy/net-mac-vendor.git

AUTHOR

       brian d foy "<bdfoy@cpan.org>"

COPYRIGHT AND LICENSE

       Copyright (c) 2004-2014 brian d foy.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.