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#!/usr/bin/perl
#
# Module: vyatta-snmp.pl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2007 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Stig Thormodsrud
# Date: October 2007
# Description: Script to glue vyatta cli to snmp daemon
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use Vyatta::Config;
use Vyatta::Misc;
use Getopt::Long;
use File::Copy;
use strict;
use warnings;
my $mibdir = '/opt/vyatta/share/snmp/mibs';
my $snmp_init = '/opt/vyatta/sbin/snmpd.init';
my $snmp_conf = '/etc/snmp/snmpd.conf';
my $snmp_client = '/etc/snmp/snmp.conf';
my $snmp_tmp = "/tmp/snmpd.conf.$$";
my $snmp_snmpv3_user_conf = '/usr/share/snmp/snmpd.conf';
my $snmp_snmpv3_createuser_conf = '/var/lib/snmp/snmpd.conf';
my $versionfile = '/opt/vyatta/etc/version';
my $snmp_level = 'service snmp';
sub snmp_restart {
system("$snmp_init restart > /dev/null 2>&1 &");
}
sub snmp_stop {
system("$snmp_init stop > /dev/null 2>&1");
}
sub snmp_start {
open (my $fh, '>', $snmp_tmp)
or die "Couldn't open $snmp_tmp - $!";
select $fh;
snmp_get_constants();
snmp_get_values();
close $fh;
select STDOUT;
snmp_client_config();
move($snmp_tmp, $snmp_conf)
or die "Couldn't move $snmp_tmp to $snmp_conf - $!";
snmp_restart();
}
sub get_version {
my $version = "unknown-version";
if (open (my $f, '<', $versionfile)) {
while (<$f>) {
chomp;
if (m/^Version\s*:\s*(.*)$/) {
$version = $1;
last;
}
}
close $f;
}
return $version;
}
sub snmp_get_constants {
my $version = get_version();
my $now = localtime;
print "# autogenerated by vyatta-snmp.pl on $now\n";
print "sysDescr Vyatta $version\n";
print "sysObjectID 1.3.6.1.4.1.30803\n";
print "sysServices 14\n";
print "agentaddress unix:/var/run/snmpd.socket,udp:161,udp6:161\n";
print "smuxpeer .1.3.6.1.4.1.3317.1.2.2\n"; # ospfd
print "smuxpeer .1.3.6.1.4.1.3317.1.2.5\n"; # bgpd
print "smuxpeer .1.3.6.1.4.1.3317.1.2.3\n"; # ripd
print "smuxsocket localhost\n";
print "perl do \"/opt/vyatta/sbin/enterprise-mib.pl\"\n";
}
# generate a random character hex string
sub randhex {
my $length = shift;
return join "", map { unpack "H*", chr(rand(256)) } 1..($length/2);
}
# output snmpd.conf file syntax for community
sub print_community {
my ($config, $community, $type) = @_;
$config->setLevel("service snmp $type $community");
my $auth = $config->returnValue('authorization');
$auth = 'ro' unless $auth;
$auth .= $type; # rocommunity
my @address = $config->returnValues('client');
push @address, $config->returnValues('network');
if (@address) {
foreach my $addr (@address) {
print "$auth $community $addr\n";
}
} else {
print "$auth $community\n";
}
}
sub snmp_get_values {
my $config = new Vyatta::Config;
my @communities = $config->listNodes("service snmp community");
foreach my $community (@communities) {
print_community($config, $community, 'community');
}
@communities = $config->listNodes("service snmp community6");
foreach my $community (@communities) {
print_community($config, $community, 'community6');
}
$config->setLevel($snmp_level);
my $contact = $config->returnValue("contact");
if (defined $contact) {
print "syscontact \"$contact\" \n";
}
my $description = $config->returnValue("description");
if (defined $description) {
print "sysdescr \"$description\" \n";
}
my $location = $config->returnValue("location");
if (defined $location) {
print "syslocation \"$location\" \n";
}
my @trap_targets = $config->listNodes("trap-target");
if (@trap_targets) {
# linkUp/Down configure the Event MIB tables to monitor
# the ifTable for network interfaces being taken up or down
# for making internal queries to retrieve any necessary information
# create an internal snmpv3 user of the form 'vyattaxxxxxxxxxxxxxxxx'
my $vyatta_user = "vyatta" . randhex(16);
snmp_create_snmpv3_user($vyatta_user);
snmp_write_snmpv3_user($vyatta_user);
print "iquerySecName $vyatta_user\n";
# Modified from the default linkUpDownNotification
# to include more OIDs and poll more frequently
print <<EOF;
notificationEvent linkUpTrap linkUp ifIndex ifDescr ifType ifAdminStatus ifOperStatus
notificationEvent linkDownTrap linkDown ifIndex ifDescr ifType ifAdminStatus ifOperStatus
monitor -r 10 -e linkUpTrap "Generate linkUp" ifOperStatus != 2
monitor -r 10 -e linkDownTrap "Generate linkDown" ifOperStatus == 2
EOF
}
foreach my $trap_target (@trap_targets) {
my $port = $config->returnValue("trap-target $trap_target port");
my $community
= $config->returnValue("trap-target $trap_target community");
print "trap2sink $trap_target";
print ":$port" if $port;
print " $community" if $community;
print "\n";
}
}
# Configure SNMP client parameters
sub snmp_client_config {
my $config = new Vyatta::Config;
$config->setLevel($snmp_level);
open (my $cf, '>', $snmp_client)
or die "Couldn't open $snmp_client - $!";
my $version = get_version();
my $now = localtime;
print {$cf} "# autogenerated by vyatta-snmp.pl on $now\n";
my $trap_source = $config->returnValue('trap-source');
print {$cf} "clientaddr $trap_source\n" if ($trap_source);
close $cf;
}
sub snmp_create_snmpv3_user {
my $vyatta_user = shift;
my $passphrase = randhex(32);
my $createuser = "createUser $vyatta_user MD5 \"$passphrase\" DES";
open(my $fh, '>>', $snmp_snmpv3_createuser_conf) || die "Couldn't open $snmp_snmpv3_createuser_conf - $!";
print $fh $createuser;
close $fh;
}
sub snmp_write_snmpv3_user {
my $vyatta_user = shift;
my $user = "rouser $vyatta_user\n";
system ("sed -i '/user[[:space:]]*vyatta[[:alnum:]]*/d' $snmp_snmpv3_user_conf 2>/dev/null;");
open(my $fh, '>>', $snmp_snmpv3_user_conf) || die "Couldn't open $snmp_snmpv3_user_conf - $!";
print $fh $user;
close $fh;
}
#
# main
#
my $update_snmp;
my $stop_snmp;
GetOptions("update-snmp!" => \$update_snmp,
"stop-snmp!" => \$stop_snmp);
snmp_start() if ($update_snmp);
snmp_stop() if ($stop_snmp);
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