summaryrefslogtreecommitdiff
path: root/scripts/snmp/vyatta-snmp.pl
blob: cba597bd1eb0494720e8faee327386eeecc664a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
#!/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 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_snmpv3_user_conf = '/usr/share/snmp/snmpd.conf';
my $snmp_snmpv3_createuser_conf = '/var/lib/snmp/snmpd.conf';

sub snmp_init {
    #
    # This requires the iptables user module libipt_rlsnmpstats.so.
    # to get the stats from "show snmp".  For now we are disabling
    # this feature.
    #

    # system("iptables -A INPUT -m rlsnmpstats");
    # system("iptables -A OUTPUT -m rlsnmpstats");
}

sub snmp_restart {
    system("$snmp_init restart > /dev/null 2>&1 &");
}

sub snmp_stop {
    system("$snmp_init stop > /dev/null 2>&1");
}

sub snmp_get_constants {
    my $output;
    
    my $date = `date`;
    chomp $date;
    $output  = "#\n# autogenerated by vyatta-snmp.pl on $date\n#\n";
    $output .= "sysDescr Vyatta\n";
    $output .= "sysObjectID 1.3.6.1.4.1.30803\n";
    $output .= "sysServices 14\n";
    $output .= "smuxpeer .1.3.6.1.4.1.3317.1.2.2\n"; 		# ospfd
    $output .= "smuxpeer .1.3.6.1.4.1.3317.1.2.5\n";		# bgpd
    $output .= "smuxpeer .1.3.6.1.4.1.3317.1.2.3\n";		# ripd
    $output .= "smuxsocket localhost\n";
    $output .= "perl do \"/opt/vyatta/sbin/enterprise-mib.pl\"\n";
    return $output;
}

sub snmp_get_values {
    my $output = '';
    my $config = new Vyatta::Config;

    $config->setLevel("protocols snmp community");
    my @communities = $config->listNodes();
    
    foreach my $community (@communities) {
        my $authorization = $config->returnValue("$community authorization");
        my @clients = $config->returnValues("$community client");
        my @networks = $config->returnValues("$community network");

        if (scalar(@clients) == 0 and scalar(@networks) == 0){
           if (defined $authorization and $authorization eq "rw") {
               $output .= "rwcommunity $community\n";
           } else {
                  $output .= "rocommunity $community\n";
           }
        } else {
                if (scalar(@clients) != 0){
                   foreach my $client (@clients){
                        if (defined $authorization and $authorization eq "rw") {
                            $output .= "rwcommunity $community $client\n";
                        } else {
                                $output .= "rocommunity $community $client\n";
                        }
                   }
                }
                if (scalar(@networks) != 0){
                   foreach my $network (@networks){
                        if (defined $authorization and $authorization eq "rw") {
                            $output .= "rwcommunity $community $network\n";
                        } else {
                                $output .= "rocommunity $community $network\n";
                        }

                   }
                }
        }
    }

    $config->setLevel("protocols snmp");
    my $contact = $config->returnValue("contact");
    if (defined $contact) {
	$output .= "syscontact \"$contact\" \n";
    }
    my $description = $config->returnValue("description");
    if (defined $description) {
	$output .= "sysdescr \"$description\" \n";
    }
    my $location = $config->returnValue("location");
    if (defined $location) {
	$output .= "syslocation \"$location\" \n";
    }

    my @trap_targets = $config->returnValues("trap-target");
    if ($#trap_targets >= 0) {

    # linkUpDownNotifications 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 a snmpv3 user needs to be created
    # we write appropriate values to /var/lib/snmp/snmpd.conf and /usr/share/snmp/snmpd.conf to do so
    # any external snmpv3 queries (from localhost or any other ip) using this username will not be responded to

    my $generate_vyatta_user_append_string = join "", map { unpack "H*", chr(rand(256)) } 1..8; #generate a random 16 character hex string
    #create an internal snmpv3 user of the form 'vyattaxxxxxxxxxxxxxxxx'
    my $vyatta_user = "vyatta" . "$generate_vyatta_user_append_string";
    snmp_create_snmpv3_user($vyatta_user);
    snmp_write_snmpv3_user($vyatta_user);
    $output .= "iquerySecName $vyatta_user\n";
    # code to activate link up down traps
    $output .= "linkUpDownNotifications yes\n";
    }
    foreach my $trap_target (@trap_targets) {
        $output .= "trap2sink $trap_target\n";
    }

    return $output;
}

sub snmp_create_snmpv3_user {

    my $vyatta_user = shift;
    my $passphrase = join "", map { unpack "H*", chr(rand(256)) } 1..16; #generate a random 32 character hex string
    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;
}

sub snmp_write_file {
    my ($config) = @_;

    open(my $fh, '>', $snmp_conf) || die "Couldn't open $snmp_conf - $!";
    print $fh $config;
    close $fh;
}


#
# main
#
my $init_snmp;
my $update_snmp;
my $stop_snmp;

GetOptions("init-snmp!"   => \$init_snmp,
	   "update-snmp!" => \$update_snmp,
           "stop-snmp!"   => \$stop_snmp);

if (defined $init_snmp) {
    snmp_init();
}

if (defined $update_snmp) { 
    my $config;

    $config  = snmp_get_constants();
    $config .= snmp_get_values();
    snmp_write_file($config);
    snmp_restart();
}

if (defined $stop_snmp) {
    snmp_stop();
}

exit 0;

# end of file