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Perl Help - easy one
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Dave Evans
*nix forums beginner


Joined: 20 Mar 2006
Posts: 39

PostPosted: Fri Jul 21, 2006 7:19 am    Post subject: Re: Perl Help - easy one Reply with quote
On Fri, Jul 21, 2006 at 07:54:24AM +0100, Peter Bowyer wrote:
Quote:
On 21/07/06, Marc Perkel <marc@perkel.com> wrote:
OK - I'm not a perl programmer - but I'm writing some perl code. I need
a quick way to get the host name from an IP address. How do I do this?

http://search.cpan.org/~olaf/Net-DNS-0.58/lib/Net/DNS/Resolver.pm

Or, if you're not so fussed about the details (e.g. if you don't mind not
being able to control the timeout, or being able to detect the difference
between different types of error), then just use the built-in gethostbyaddr():

use Socket qw( inet_aton AF_INET );
my $hostname = gethostbyaddr(inet_aton($ip_address), AF_INET);

Net::DNS is more thorough, but harder work of course.

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Dave Evans
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PGP key: http://powernet.co.uk/~davide/pgpkey
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Peter Bowyer
*nix forums Guru


Joined: 27 Jan 2005
Posts: 340

PostPosted: Fri Jul 21, 2006 6:54 am    Post subject: Re: Perl Help - easy one Reply with quote
On 21/07/06, Marc Perkel <marc@perkel.com> wrote:
Quote:
OK - I'm not a perl programmer - but I'm writing some perl code. I need
a quick way to get the host name from an IP address. How do I do this?

search.cpan.org is your friend.

http://search.cpan.org/~olaf/Net-DNS-0.58/lib/Net/DNS/Resolver.pm

Don't forget to handle errors, timeouts, 'No Data', CNAMEs (which are
common in the in-addr.arpa zone to handle classless delegation), and
the fact that there may be more than one host name and the order the
multiple ones arrive in isn't necessarily consistent,

Peter

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Peter Bowyer
Email: peter@bowyer.org

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Marc Perkel
*nix forums Guru


Joined: 27 Jan 2005
Posts: 502

PostPosted: Fri Jul 21, 2006 5:54 am    Post subject: Perl Help - easy one Reply with quote
OK - I'm not a perl programmer - but I'm writing some perl code. I need
a quick way to get the host name from an IP address. How do I do this?


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