Net::Pcap lookupdev problem

gri6507 has asked for the wisdom of the Perl Monks concerning the following question:

Fellow monks, I've just started using Net::Pcap. I read the tutorial and the CPAN documentation. My syntax and usage of the lookupdev() and findalldevs() methods seems normal. However, when I run this script under linux, my script does not find any devices! At the same time, the exact same script running in Windows works just fine (except that lib_version() method seems to not be implemented). I can't help but wonder if this has anything to do with the pcap library on my linux installation (version 0.9.1). Does anyone have any ideas?

use strict;
use Net::Pcap;

$|++;
my $err;

print "pcap version " . Net::Pcap::lib_version() . "\n";

my %devinfo;
my @devs = Net::Pcap::findalldevs(\$err, \%devinfo);
if (defined $err) {
    die 'Unable to determine network device for monitoring - ', $err;
}

my $choice;
do {
    print "Please choose a device to monitor:\n";
    my $i = 0;
    for my $dev (@devs) {
        print ++$i . " - $dev : $devinfo{$dev}\n"
    }
    print "Choice: ";
    $choice = <>;
} while ($choice<1 or $choice>scalar(@devs));
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Re: Net::Pcap lookupdev problem by Anonymous Monk on Apr 12, 2006 at 13:40 UTC
I haven't run your code, but wish to comment something anyway. When I run the Ethereal desktop app in Linux, it also doesn't list the network interfaces/devices, unless running with superuser privileges.	[reply]
Re^2: Net::Pcap lookupdev problem by gri6507 (Deacon) on Apr 12, 2006 at 14:02 UTC
Thanks. That was exactly it. Silly me, I forgot about privileges.	[reply]
Re^3: Net::Pcap lookupdev problem by Anonymous Monk on Mar 07, 2008 at 08:10 UTC
I am running the below program x0004276@wipultra361 /cygdrive/T/gen/perl/activestate/5_8_6_811/site/lib/Net-Pca p-0.04 $ perl pktdump.pl "functions" is not defined in %Net::Pcap::EXPORT_TAGS at pktdump.pl line 4 main::BEGIN() called at /usr/lib/perl5/site_perl/5.8/cygwin/Net/Pcap.pm line 4 eval {...} called at /usr/lib/perl5/site_perl/5.8/cygwin/Net/Pcap.pm lin e 4 Can't continue after import errors at pktdump.pl line 4 BEGIN failed--compilation aborted at pktdump.pl line 4. I have installed the Net::Pcap recently. But when i run the above program it fails. please let me know if this is a privilage problem or the installation is not complete. please help. I have used cygwin	[reply]