Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

Re: IP Address Sanity

by jdporter (Paladin)
on Nov 07, 2002 at 23:34 UTC ( [id://211290]=note: print w/replies, xml ) Need Help??


in reply to IP Address Sanity

The problem with your general approach is that IP addresses aren't really textual strings, they're 32-bit integers. The dotted-quad is just one convenient representation. But it's not the only one.

A proper solution to your stated need is to use the inet_aton and inet_ntoa functions provided by the Socket module, which is part of the standard library.

inet_aton translates any valid IP address -- regardless of notation format -- or domain name into a packed string containing the 32-bit integer. Such a string can be converted into a dotted-quad representation by the inet_ntoa function.

Example:

use Socket; # load inet_aton, inet_ntoa $_ = <>; # read user's input chomp; # convert to packed string. succeeds if valid address. my $ip = inet_aton( $_ ); # length will be 4 for IPv4 addresses. length($ip) or die "Sorry, '$_' is invalid.\n"; $ip = inet_ntoa($ip); # convert to dotted quad. print "$_ is valid; its IP address is $ip\n";

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://211290]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others imbibing at the Monastery: (2)
As of 2025-06-15 18:26 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?
    erzuuliAnonymous Monks are no longer allowed to use Super Search, due to an excessive use of this resource by robots.