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#! /usr/bin/perl
#
# What? WHAAAAT? What's going on?
#
# Simple to to figure out what those tools in the network department have
# actually done. Uses SNMP to gather information about your network, using
# multiple techniques to father information about "next hop".
#
# Usage: ./lolwhat.pl <ip> <community>
#
# This will connect to <ip> and poll it for SNMP-data, then add that to an
# asset database.
use POSIX;
use Time::HiRes;
use strict;
use warnings;
use Data::Dumper;
use lib '/opt/gondul/include';
use FixedSNMP;
use nms;
use nms::snmp;
# Actual assets detected, indexed by chassis ID
my %assets;
my %arp;
# Tracking arrays. Continue scanning until they are of the same length.
my @ips_checked;
my @ips_to_check;
# If we are given one switch on the command line, add that and then exit.
my $cmdline_community = shift;
my @ips = @ARGV;
my %lldpmap = ();
sub mylog {
my $msg = shift;
my $time = POSIX::ctime(time);
$time =~ s/\n.*$//;
printf STDERR "[%s] %s\n", $time, $msg;
}
my %ipmap = ();
my %peermap = ();
my %snmpresults = ();
foreach my $target (@ips) {
my $snmp = get_snmp_data($target, $cmdline_community);
my $parsed = parse_snmp($snmp);
$snmpresults{$target} = $parsed;
#print Dumper(\$parsed);
}
#print Dumper(\%ipmap);
#print Dumper(\%peermap);
my %hood = ();
my %extended = ();
mylog("Building peermaps");
while (my ($ip, $value) = each %peermap) {
my $sys = $ipmap{$ip} || $ip;
my $real = defined($ipmap{$ip});
foreach my $sys2 (@{$value}) {
if ($real) {
$hood{$sys}{$sys2} = 1;
$hood{$sys2}{$sys} = 1;
} else {
$extended{$sys2}{$sys} = 1;
}
}
}
#print Dumper(\%hood);
#print Dumper(\%extended);
my %result = ( snmpresults => \%snmpresults, hood => \%hood, extended => \%extended, ipmap => \%ipmap, peermap => \%peermap, lldpmap => \%lldpmap);
mylog("Done. Outputting JSON.");
print JSON::XS::encode_json(\%result);
exit;
# Get raw SNMP data for an ip/community.
sub get_snmp_data {
my ($ip, $community) = @_;
my %ret = ();
mylog("Polling $ip");
eval {
my $session = nms::snmp::snmp_open_session($ip, $community);
$ret{'sysName'} = $session->get('sysName.0');
$ret{'sysDescr'} = $session->get('sysDescr.0');
$ret{'lldpLocChassisId'} = $session->get('lldpLocChassisId.0');
$ret{'lldpRemManAddrTable'} = $session->gettable("lldpRemManAddrTable");
$ret{'lldpRemTable'} = $session->gettable("lldpRemTable");
$ret{'ipNetToMediaTable'} = $session->gettable('ipNetToMediaTable');
$ret{'ifTable'} = $session->gettable('ifTable');
$ret{'ifXTable'} = $session->gettable('ifXTable');
$ret{'ipAddressTable'} = $session->gettable('ipAddressTable');
#print Dumper(\%ret);
};
if ($@) {
my $tmp = "$@";
chomp($tmp);
mylog("\t" . $tmp);
return undef;
}
return \%ret;
}
# Filter raw SNMP data over to something more legible.
# This is the place to add all post-processed results so all parts of the
# tool can use them.
sub parse_snmp
{
my $snmp = $_[0];
my %result = ();
my %lol = ();
mylog("\tPost-processing SNMP");
my $sysname = $snmp->{sysName};
mylog("\tSysname: $sysname");
$result{sysName} = $sysname;
$result{sysDescr} = $snmp->{sysDescr};
my $chassis_id = nms::convert_mac($snmp->{lldpLocChassisId});
my $bad_chassis_id = 0;
if (defined($chassis_id)) {
$result{lldpLocChassisId} = $chassis_id;
mylog("\tChassis id: $chassis_id");
if (defined($chassis_id) and defined($lldpmap{$chassis_id}{sysName})) {
mylog("\t\tSwitch/chassis already known?");
if ($lldpmap{$chassis_id}{sysName} ne $sysname) {
mylog("\t\tXXX: Likely chassis ID collision");
mylog("\t\tXXX: Chassis ID previously seen as $lldpmap{$chassis_id}{sysName}");
mylog("\t\tXXX: But we are $sysname! This will dampen the mood.");
$bad_chassis_id = 1;
}
} else {
mylog("\t\tNew chassis");
$lldpmap{$chassis_id}{sysName} = $sysname;
}
} else {
mylog("\t\tNo lldpLocChassisId found. Bummer. Enable LLDP?");
$bad_chassis_id = 1;
}
@{$result{ips}} = ();
@{$result{peers}} = ();
@{$result{lldppeers}} = ();
mylog("\tParsing lldp neighbors");
while (my ($key, $value) = each %{$snmp->{lldpRemTable}}) {
my $idx = $value->{lldpRemLocalPortNum};
my $rem_chassis_id = nms::convert_mac($value->{'lldpRemChassisId'});
my $remname = $value->{lldpRemSysName};
mylog("\t\tSpotted $rem_chassis_id / $remname");
foreach my $key2 (keys %$value) {
$lol{$idx}{$key2} = $value->{$key2};
}
$lol{$idx}{key} = $key;
$lol{$idx}{'lldpRemChassisId'} = $rem_chassis_id;
my %caps = ();
nms::convert_lldp_caps($value->{'lldpRemSysCapEnabled'}, \%caps);
$lol{$idx}{'lldpRemSysCapEnabled'} = \%caps;
if ($bad_chassis_id == 1) {
mylog("\t\tXXX:Skipping lldp-coupling due to broken/nonexistent lldpLocChassisId");
next;
}
$lldpmap{$chassis_id}{peers}{$rem_chassis_id} = 1;
$lldpmap{$rem_chassis_id}{peers}{$chassis_id} = 1;
if (defined($lldpmap{$rem_chassis_id}{sysName})) {
if ($lldpmap{$rem_chassis_id}{sysName} ne $remname) {
mylog("\t\t\tXXX: Collision .... $rem_chassis_id: $remname vs $lldpmap{$rem_chassis_id}{sysName}");
}
} else {
$lldpmap{$rem_chassis_id}{sysName} = $remname;
}
}
mylog("\tParsing lldp neighbors management interfaces");
while (my ($key, $value) = each %{$snmp->{lldpRemManAddrTable}}) {
my $old = 0;
my $idx = $value->{lldpRemLocalPortNum};
my $remname = $lol{$idx}{lldpRemSysName};
if (defined($lol{$idx}{lldpRemManAddr})) {
$old = $lol{$idx}{lldpRemManAddrSubtype};
}
my $addr = $value->{'lldpRemManAddr'};
my $addrtype = $value->{'lldpRemManAddrSubtype'};
foreach my $key2 (keys %$value) {
if ($key2 eq 'lldpRemManAddr') {
next;
}
$lol{$idx}{$key2} = $value->{$key2};
}
my $remip;
if ($addrtype == 1) {
$remip = nms::convert_ipv4($addr);
} elsif ($addrtype == 2) {
$remip = nms::convert_ipv6($addr);
} else {
next;
}
if ($old != 0) {
if ($old != $addrtype) {
mylog("\t\tTwo management IPs discovered on port. v4 vs v6.");
mylog("\t\t\t$lol{$idx}{lldpRemManAddr} vs $remip");
}
if ($old > $addrtype) {
$lol{$idx}{lldpRemManAddr} = $remip;
}
} else {
$lol{$idx}{lldpRemManAddr} = $remip;
}
if (!defined($ipmap{$remip})) {
$ipmap{$remip} = $remname;
}
mylog("\t\tPeer added: $remip");
push @{$result{peers}}, $remip;
push @{$lol{$idx}{peers}}, $remip;
}
mylog("\tParsing local interfaces");
while (my ($key, $value) = each %{$snmp->{ifTable}}) {
$value->{ifPhysAddress} = nms::convert_mac($value->{ifPhysAddress});
foreach my $key2 (keys %$value) {
$lol{$value->{ifIndex}}{$key2} = $value->{$key2};
}
}
mylog("\tParsing ARP table");
while (my ($key, $value) = each %{$snmp->{ipNetToMediaTable}}) {
my $mac = nms::convert_mac($value->{ipNetToMediaPhysAddress});
my $idx = $value->{ipNetToMediaIfIndex};
$value->{ipNetToMediaPhysAddress} = $mac;
push @{$lol{$idx}{ARP}}, $value;
if ($lol{$idx}{ifPhysAddress} eq $mac) {
push @{$lol{$idx}{ips}}, $value->{ipNetToMediaNetAddress};
push @{$result{ips}}, $value->{ipNetToMediaNetAddress};
} else {
mylog("\t\tAdding peer: $value->{ipNetToMediaNetAddress}");
push @{$lol{$idx}{peers}}, $value->{ipNetToMediaNetAddress};
push @{$result{peers}}, $value->{ipNetToMediaNetAddress};
}
}
while (my ($key, $value) = each %{$snmp->{ifXTable}}) {
foreach my $key2 (keys %$value) {
$lol{$key}{$key2} = $value->{$key2};
}
}
mylog("\tParsing ipAddressTable");
while (my ($key, $value) = each %{$snmp->{ipAddressTable}}) {
my $addr = $value->{ipAddressAddr};
my $addrtype = $value->{ipAddressAddrType};
if ($addrtype == 1) {
$addr = nms::convert_ipv4($addr);
} elsif ($addrtype == 2) {
$addr = nms::convert_ipv6($addr);
} else {
mylog("\t\tSkipping unknown addrtype: $addrtype");
next;
}
mylog("\t\tLocal IP added: $addr");
push @{$result{ips}}, $addr;
}
@{$result{peers}} = sort @{$result{peers}};
@{$result{ips}} = sort @{$result{ips}};
$result{interfaces} = \%lol;
foreach my $localip (@{$result{ips}}) {
$ipmap{$localip} = $result{sysName};
}
foreach my $peer (@{$result{peers}}) {
if (!defined($peermap{$peer})) {
@{$peermap{$peer}} = ();
}
push @{$peermap{$peer}}, $result{sysName};
}
return \%result;
}
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