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IP and hostmask

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IP and hostmask Perl Programming forum discussing coding in Perl, utilizing Perl modules, and other Perl-related topics. Perl, the Practical Extraction and Reporting Language, is the choice for many for parsing textual information.

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  #1  
Old July 21st, 2001, 12:25 PM
Kimppa Kimppa is offline
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Question IP and hostmask
I'm making a web portal that has restricted amount of users.
Now, I need to increase the security on this site, and I've decided to use IP and hostmask for that.
My problem is that I don't know how to get a user's IP or hostmask with Perl.
Could someone tell me how to get it?

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Old July 21st, 2001, 12:37 PM
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The absolute easiest way is to use CGI.pm to retrieve this information from the environment variables. In fact, CGI.pm makes pretty much all CGI programming easier.

Code:
use CGI;
my $q= CGI->new();

my $ip_or_hostname=$q->remote_host();


This will put either the hostname of the client, or the IP if the hostname isn't available, into the $ip_or_hostname variable.

Please don't think that IP or hostname based security is the be-all end-all though, this stuff can be spoofed.

Building off your sig, the CGI.pm docs are at the address below:

http://stein.cshl.org/WWW/software/CGI/

Good luck!
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Old July 21st, 2001, 01:11 PM
Kimppa Kimppa is offline
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Ok, thanks, got the IP-thingie working.... but how about the hostmask?

I know that it isn't top-security to use only ip & hostmask control, but this thing I'm making doesn't need to be top-top-secure.
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Old July 29th, 2001, 01:10 PM
TBehling TBehling is offline
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"Hostmask"
By "host mask", I assume you mean "network mask". You can't determine a client computer's netmask from another computer, and it would play no role in authentication.

If you're trying to limit access to a range of IP addresses, that's another question. If you're running Apache and want to restrict the site to machines in 192.168.1.???, put this in the .htaccess file in the directory you want to restrict:

Order allow,deny
Allow from 192.168.1.0/24

Read more about Apache's access control mechanisms at:

URL
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