#! /usr/bin/perl

# ============================================================================

# $Id: example3.pl,v 6.0 2009/09/09 15:05:32 dtown Rel $

# Copyright (c) 2001-2009 David M. Town <dtown@cpan.org>
# All rights reserved.

# This program is free software; you may redistribute it and/or modify it
# under the same terms as the Perl 5 programming language system itself.

# ============================================================================

use strict;
use warnings;

use Net::SNMP qw(:snmp);

my $OID_ifTable = '1.3.6.1.2.1.2.2';
my $OID_ifPhysAddress = '1.3.6.1.2.1.2.2.1.6';

my ($session, $error) = Net::SNMP->session(
   -hostname    => shift || 'localhost',
   -community   => shift || 'public',
   -nonblocking => 1,
   -translate   => [-octetstring => 0],
   -version     => 'snmpv2c',
);

if (!defined $session) {
   printf "ERROR: %s.\n", $error;
   exit 1;
}

my %table; # Hash to store the results

my $result = $session->get_bulk_request(
   -varbindlist    => [ $OID_ifTable ],
   -callback       => [ \&table_callback, \%table ],
   -maxrepetitions => 10,
);

if (!defined $result) {
   printf "ERROR: %s\n", $session->error();
   $session->close();
   exit 1;
}

# Now initiate the SNMP message exchange.

snmp_dispatcher();

$session->close();

# Print the results, specifically formatting ifPhysAddress.

for my $oid (oid_lex_sort(keys %table)) {
   if (!oid_base_match($OID_ifPhysAddress, $oid)) {
      printf "%s = %s\n", $oid, $table{$oid};
   } else {
      printf "%s = %s\n", $oid, unpack 'H*', $table{$oid};
   }
}

exit 0;

sub table_callback
{
   my ($session, $table) = @_;

   my $list = $session->var_bind_list();

   if (!defined $list) {
      printf "ERROR: %s\n", $session->error();
      return;
   }

   # Loop through each of the OIDs in the response and assign
   # the key/value pairs to the reference that was passed with
   # the callback.  Make sure that we are still in the table 
   # before assigning the key/values.

   my @names = $session->var_bind_names();
   my $next  = undef;

   while (@names) {
      $next = shift @names;
      if (!oid_base_match($OID_ifTable, $next)) {
         return; # Table is done.
      }
      $table->{$next} = $list->{$next};
   }

   # Table is not done, send another request, starting at the last 
   # OBJECT IDENTIFIER in the response.  No need to include the
   # calback argument, the same callback that was specified for the
   # original request will be used.

   my $result = $session->get_bulk_request(
      -varbindlist    => [ $next ],
      -maxrepetitions => 10,
   );

   if (!defined $result) {
      printf "ERROR: %s.\n", $session->error();
   }

   return;
}

# ============================================================================