Re: Determine which route to take

[Perlbotics]

You could try NetAddr::IP:

use strict;
use warnings;
use Test::More;
use NetAddr::IP;

my @routes = ( [ qw(192.168.0.0/24 192.168.0.1) ],
               [ qw(10.10.10.0/24  10.10.10.1)  ],
               [ qw(12.162.8.11/28 default)     ],
             );


is( calc_route( "192.168.0.88" ), "192.168.0.1",  "first route" );
is( calc_route( "192.168.1.88" ), "default",      "close to first rout
+e but default" );
is( calc_route( "10.10.10.12"  ), "10.10.10.1",   "second route (examp
+le IP)" );
is( calc_route( "12.162.8.3"   ), "default",      "explicit default" )
+;
is( calc_route( "1.2.3.4"      ), "default",      "else: default" );

done_testing;



sub calc_route {
  my $ip = NetAddr::IP->new( shift );

  for my $test_subnet ( @routes ) {
    if ( $ip->within( NetAddr::IP->new( $test_subnet->[0] ) ) ) {
      return $test_subnet->[1];
    }
  }

  return 'default';
}

Result:

ok 1 - first route
ok 2 - close to first route but default
ok 3 - second route (example IP)
ok 4 - explicit default
ok 5 - else: default
1..5

Use hashes and pre-computed objects for better performance (left as an exercise ;-).

[mhearse]

Thanks for your reply. For some reason I though it would be a simple bitwise AND. My knowledge of bitwise operators is pathetic.