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#!/usr/bin/perl -w
###
### Use map_table to list the ipAddrTable.
use strict;
use BER;
use SNMP_Session;
my $version = '1';
my $ifDescr = [1,3,6,1,2,1,2,2,1,2];
my $ipAdEntAddr = [1,3,6,1,2,1,4,20,1,1];
my $ipAdEntIfIndex = [1,3,6,1,2,1,4,20,1,2];
my $ipAdEntNetmask = [1,3,6,1,2,1,4,20,1,3];
my $ipAdEntBcastAddr = [1,3,6,1,2,1,4,20,1,4];
my $ipAdEntReasmMaxSize = [1,3,6,1,2,1,4,20,1,5];
### If this is zero, the function pretty_net_and_mask will always
### print the prefix length in classless notation
### (e.g. 130.59.0.0/16), even if the prefix length is the classful
### default one for the address range in question.
###
my $use_classful_defaults = 0;
my $max_repetitions = 0;
while (defined $ARGV[0] && $ARGV[0] =~ /^-/) {
if ($ARGV[0] =~ /^-v/) {
if ($ARGV[0] eq '-v') {
shift @ARGV;
usage (1) unless defined $ARGV[0];
} else {
$ARGV[0] = substr($ARGV[0], 2);
}
if ($ARGV[0] eq '1') {
$version = '1';
} elsif ($ARGV[0] eq '2c') {
$version = '2c';
} else {
usage (1);
}
} elsif ($ARGV[0] =~ /^-m/) {
if ($ARGV[0] eq '-m') {
shift @ARGV;
usage (1) unless defined $ARGV[0];
} else {
$ARGV[0] = substr($ARGV[0], 2);
}
if ($ARGV[0] =~ /^[0-9]+$/) {
$max_repetitions = $ARGV[0];
} else {
usage (1);
}
} elsif ($ARGV[0] eq '-h') {
usage (0);
exit 0;
} else {
usage (1);
}
shift @ARGV;
}
my $host = $ARGV[0] || die "usage: $0 target [community]";
my $community = $ARGV[1] || 'public';
my $session =
($version eq '1' ? SNMPv1_Session->open ($host, $community, 161)
: $version eq '2c' ? SNMPv2c_Session->open ($host, $community, 161)
: die "Unknown SNMP version $version")
|| die "Opening SNMP_Session";
$max_repetitions = $session->default_max_repetitions
unless $max_repetitions;
$session->default_max_repetitions ($max_repetitions);
my $if_descr = get_if_descrs ($session);
printf "%-18s %s\n", "IP address", "if#";
$session->map_table ([$ipAdEntIfIndex,
$ipAdEntNetmask, $ipAdEntBcastAddr,
$ipAdEntReasmMaxSize],
sub {
my ($index, $if_index, $netmask,
$bcast, $reasm) = @_;
map { defined $_ && ($_=pretty_print $_) }
($if_index, $netmask,
$bcast, $reasm);
my $addr = $index;
printf "%-18s %-20s ",
pretty_net_and_mask ($addr, $netmask),
$if_descr->{$if_index} || '?';
if (defined $bcast) {
printf "%d", $bcast;
} else {
print "?";
}
print " ";
if (defined $reasm) {
printf "%6d", $reasm;
} else {
print " ?";
}
print "\n";
});
$session->close ();
1;
sub netmask_to_prefix_length ($) {
my ($mask) = @_;
$mask = pack ("CCCC", split (/\./, $mask));
$mask = unpack ("N", $mask);
my ($k);
for ($k = 0; $k < 32; ++$k) {
if ((($mask >> (31-$k)) & 1) == 0) {
last;
}
}
return $k;
}
sub pretty_net_and_mask ($$) {
my ($net, $mask) = @_;
my $prefix_length = netmask_to_prefix_length ($mask);
my ($firstbyte) = split ('\.', $net);
my $classful_prefix_length
= $firstbyte < 128 ? 8
: $firstbyte < 192 ? 16
: $firstbyte < 224 ? 24 : -1;
($use_classful_defaults
&& $prefix_length == $classful_prefix_length)
? $net : $net.'/'.$prefix_length;
}
sub get_if_descrs ($) {
my ($session) = @_;
my %descrs = ();
$session->map_table ([$ifDescr],
sub { my ($index, $descr) = @_;
$descrs{$index} = pretty_print ($descr);
});
\%descrs;
}
sub usage ($) {
warn <<EOM;
Usage: $0 [-v (1|2c)] [-m max] switch [community]
$0 -h
-h print this usage message and exit.
-v version can be used to select the SNMP version. The default
is SNMPv1, which is what most devices support. If your box
supports SNMPv2c, you should enable this by passing "-v 2c"
to the script. SNMPv2c is much more efficient for walking
tables, which is what this tool does.
-m max specifies the maxRepetitions value to use in getBulk requests
(only relevant for SNMPv2c).
switch hostname or IP address of an LS1010 switch
community SNMP community string to use. Defaults to "public".
EOM
exit (1) if $_[0];
}
