Net::IP::CMatch - Efficiently match IP addresses against IP ranges with C.

  use Net::IP::CMatch;
  my $match = match_ip( $ip_addr, $match_ip1, $match_ip2, ... );

Net::IP::CMatch is based upon, and does the same thing as Net::IP::Match. The unconditionally exported subroutine 'match_ip' determines if the ip to match ( first argument ) matches any of the subsequent ip arguments. Match arguments may be absolute quads, as '127.0.0.1', or contain mask bits as '111.245.76.248/29'. A true return value indicates a match. It was written in C, rather than a macro, preprocessed through Perl's source filter mechanism ( as is Net::IP::Match ), so that the ip arguments could be traditional perl scalars. The C code is lean and mean ( IMHO ).

I use this module in my Apache server's mod_perl DB logging script to determine if an incoming IP is 'remote' or 'local'. First, I set up some variables in httpd.conf:

  PerlSetvar DBILogger_local_ips '222.234.52.192/29'
  PerlAddvar DBILogger_local_ips '111.245.76.248/29'
  PerlAddvar DBILogger_local_ips '10.0.0.0/24'
  PerlAddvar DBILogger_local_ips '172.16.0.0/12'
  PerlAddvar DBILogger_local_ips '192.168.0.0/16'
  PerlAddvar DBILogger_local_ips '127.0.0.1'

These are the ip addresses I want to be considered local. In the mod_perl module:

  my @local_ips = $r->dir_config( "DBILogger_local_ips" );
  my $local = match_ip( $incoming_ip, @local_ips );

Now $local is just that, and I set the database key accordingly.

'match_ip', unconditionally.

Net::IP::Match by Marcel Grünauer.

Beau E. Cox, <beaucox@hawaii.rr.com>

Copyright (C) 2004 by Beau E. Cox

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.6.1 or, at your option, any later version of Perl 5 you may have available.