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Full Discussion: Perform an action if certain text exist in output (PERL)
Top Forums Shell Programming and Scripting Perform an action if certain text exist in output (PERL) Post 302777907 by in2nix4life on Friday 8th of March 2013 04:21:09 PM
Old 03-08-2013
Corona speaks the truth. If you're going to use a language, go all in and use if fully. I'm surrounded by system admins that write scripts in such a way. Better to adapt the good habits early on. Here's an example of what you're doing in pure Perl (with the help of a couple of modules):

Code:
#!/usr/bin/perl
#

use strict;
use Net::DNS;
use Net::Ping;

# create dns instance
my $ptr = Net::DNS::Resolver->new();

# create ping instance
my $do_ping = Net::Ping->new();

# prompt for ip address to lookup
print "IP Address -> ";
chomp(my $ip = <STDIN>);

# format ip address for reverse dns lookup
my $dns_suffix = ".in-addr.arpa";
my $reverse_ip = join('.', reverse(split /\./, $ip)) . $dns_suffix;

# perform dns lookup
my $response = $ptr->query($reverse_ip, 'PTR');
if($response) {
    print "PTR Record Found For $ip\n";
} else {
    print "PTR Not Found For $ip\n";
    print "Checking For Response From $ip\n";
    if($do_ping->ping($ip)) {
        print "$ip Is Responding To Pings\n";
    } else {
        print "$ip Is Not Responding To Pings\n";
    }
}

# done
exit(0);

 

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LEARN ABOUT OSX

net::dns::resolver::recurse

Net::DNS::Resolver::Recurse(3)				User Contributed Perl Documentation			    Net::DNS::Resolver::Recurse(3)

NAME

       Net::DNS::Resolver::Recurse - Perform recursive dns lookups

SYNOPSIS

	 use Net::DNS::Resolver::Recurse;
	 my $res = Net::DNS::Resolver::Recurse->new;

DESCRIPTION

       This module is a sub class of Net::DNS::Resolver. So the methods for Net::DNS::Resolver still work for this module as well.  There are just
       a couple methods added:

   hints
       Initialize the hint servers.  Recursive queries need a starting name server to work off of. This method takes a list of IP addresses to use
       as the starting servers.  These name servers should be authoritative for the root (.) zone.

	 $res->hints(@ips);

       If no hints are passed, the default nameserver is asked for the hints.  Normally these IPs can be obtained from the following location:

	 ftp://ftp.internic.net/domain/named.root

   recursion_callback
       This method is takes a code reference, which is then invoked each time a packet is received during the recursive lookup.  For example to
       emulate dig's "+trace" function:

	$res->recursion_callback(sub {
	    my $packet = shift;

	    $_->print for $packet->additional;

	    printf(";; Received %d bytes from %s

",
		$packet->answersize,
		$packet->answerfrom
	    );
	});

   query_dorecursion
       This method is much like the normal query() method except it disables the recurse flag in the packet and explicitly performs the recursion.

	 $packet = $res->query_dorecursion( "www.netscape.com.", "A");

IPv6 transport
       If the appropriate IPv6 libraries are installed the recursive resolver will randomly choose between IPv6 and IPv4 addresses of the
       nameservers it encounters during recursion.

       If you want to force IPv4 transport use the force_v4() method. Also see the IPv6 transport notes in the Net::DNS::Resolver documentation.

AUTHOR

       Rob Brown, bbb@cpan.org

SEE ALSO

       Net::DNS::Resolver,

COPYRIGHT

       Copyright (c) 2002, Rob Brown.  All rights reserved.  Portions Copyright (c) 2005, Olaf M Kolkman.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       $Id: Recurse.pm 932 2011-10-26 12:40:48Z willem $

perl v5.16.2							    2012-01-27					    Net::DNS::Resolver::Recurse(3)
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