Getting an IP address is even a Perl FAQ1 :)

How do I find out my hostname/domainname/IP address?

The normal way to find your own hostname is to call the `hostname` program. While sometimes expedient, this has some problems, such as not knowing whether you've got the canonical name or not. It's one of those tradeoffs of convenience versus portability.

The Sys::Hostname module (part of the standard perl dis- tribution) will give you the hostname after which you can find out the IP address (assuming you have working DNS) with a gethostbyname() call.

           use Socket;
           use Sys::Hostname;
           my $host = hostname();
           my $addr = inet_ntoa(scalar gethostbyname($host || 'localho
+st'));

[download]

Probably the simplest way to learn your DNS domain name is to grok it out of /etc/resolv.conf, at least under Unix. Of course, this assumes several things about your resolv.conf configuration, including that it exists.

(We still need a good DNS domain name-learning method for non-Unix systems.)

1 perldoc -q "IP address"

--
b10m

All code is usually tested, but rarely trusted.

In reply to Re: ip address get problem by b10m
in thread ip address get problem by markd

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