jose_m has asked for the wisdom of the Perl Monks concerning the following question:

hello Monks, can someone help me query dns for a part of a hostname and return a list of hosts that match into an array? i can query using socket but it seems to only return the subdomain 

#!/usr/bin/perl
use Socket;
use IO::Socket;
use warnings;


sub getWin {

 @win = gethostbyname("win")
    or die $!;
 print "@win\n";
}
&getWin;

[download]

this is not retuning a list of hosts names win01.xx.com does anyone see the issue? also net::dns does not seem to be able to return a list of hostnames, is this true? thanks jose.

Replies are listed 'Best First'.
Re: query dns by hostname
by skx (Parson) on Mar 25, 2014 at 12:50 UTC

    This is a simple example - but note that you might be seeing failures because the host you're querying win isn't fully-qualified..?

    #!/usr/bin/perl

use strict;
use warnings;
use Net::DNS;

sub lookupHost
{
    my( $host ) = ( @_ );

    my @results;

    my $res   = Net::DNS::Resolver->new;
    my $query = $res->search($host);

    if ($query) {
        foreach my $rr ($query->answer) {
            push( @results, $rr->address ) if ( $rr->type eq "A" );
        }
    } else {
        warn "query failed: ", $res->errorstring, "\n";
    }

    return( @results );
}


my @out = lookupHost( "google.com" );
foreach my $ip ( @out )
{
    print "result: $ip\n";
}

    [download]
    Steve
    --
[reply]
[d/l]
Re: query dns by hostname
by lithron (Chaplain) on Mar 27, 2014 at 00:20 UTC
    I think you are misunderstanding what gethostbyname() does. gethostbyname allows you to resolve a DNS (or /etc/hosts entry) to an IP address. It does not allow you to do wildcard searches on a partial domain name.
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