Hello. I only have a suggention on the IP matching part. I've always found myself using the below extra-large regexp, courtesy of Mastering Regular Expressions.

my @ips = qw(   127.0.0.1
                0.0.0.0
                256.0.0.1
                123.555.333.222666  );

foreach my $ip (@ips) {
    my $f = undef;
    if($ip =~ m/^(?!0+\.0+\.0+\.0)
                ([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])
                \.([01]?\d\d?|2[0-4]\d|25[0-5])$/x ) {
        $f =1;
    }
    print 'Is', $f ? "" : 'n\'t', " valid and/or usable IP: $ip \n"
}
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When run produces:

Is valid and/or usable IP: 127.0.0.1 
Isn't valid and/or usable IP: 0.0.0.0 
Isn't valid and/or usable IP: 256.0.0.1 
Isn't valid and/or usable IP: 123.555.333.222666
[download]

Update: changed code to better illustrate its usefulness.