261 lines
8.9 KiB
Perl
261 lines
8.9 KiB
Perl
package PandoraFMS::SNMPServer;
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##########################################################################
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# Pandora FMS SNMP Console.
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# Pandora FMS. the Flexible Monitoring System. http://www.pandorafms.org
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##########################################################################
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# Copyright (c) 2005-2009 Artica Soluciones Tecnologicas S.L
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License
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# as published by the Free Software Foundation; version 2
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##########################################################################
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use strict;
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use warnings;
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use threads;
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use threads::shared;
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use Thread::Semaphore;
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use Time::Local;
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use XML::Simple;
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# Default lib dir for RPM and DEB packages
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use lib '/usr/lib/perl5';
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use PandoraFMS::Tools;
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use PandoraFMS::DB;
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use PandoraFMS::Core;
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use PandoraFMS::Server;
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# Inherits from PandoraFMS::Server
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our @ISA = qw(PandoraFMS::Server);
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########################################################################################
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# SNMP Server class constructor.
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########################################################################################
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sub new ($$;$) {
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my ($class, $config, $dbh) = @_;
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return undef unless $config->{'snmpconsole'} == 1;
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# Start snmptrapd
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my $pid_file = '/var/run/pandora_snmptrapd.pid';
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my $snmptrapd_running = 0;
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if ( -e $pid_file && open (PIDFILE, $pid_file)) {
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my $pid = <PIDFILE> + 0;
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close PIDFILE;
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# Check if snmptrapd is running
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if ($snmptrapd_running = kill (0, $pid)) {
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logger ($config, "snmptrapd (pid $pid) is already running, attempting to kill it...", 1);
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print_message ($config, "snmptrapd (pid $pid) is already running, attempting to kill it...", 1);
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kill (9, $pid);
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}
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}
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# Ignore auth failure traps
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my $snmp_ignore_authfailure = ($config->{'snmp_ignore_authfailure'} eq '1' ? ' -a' : '');
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# Select agent-addr field of the PDU or PDU source address for V1 traps
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my $address_format = ($config->{'snmp_pdu_address'} eq '0' ? '%a' : '%b');
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my $snmptrapd_args = ' -t -On -n' . $snmp_ignore_authfailure . ' -Lf ' . $config->{'snmp_logfile'} . ' -p ' . $pid_file;
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$snmptrapd_args .= ' --format1=SNMPv1[**]%4y-%02.2m-%l[**]%02.2h:%02.2j:%02.2k[**]' . $address_format . '[**]%N[**]%w[**]%W[**]%q[**]%v\\\n';
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$snmptrapd_args .= ' --format2=SNMPv2[**]%4y-%02.2m-%l[**]%02.2h:%02.2j:%02.2k[**]%b[**]%v\\\n';
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if (system ($config->{'snmp_trapd'} . $snmptrapd_args . ' >/dev/null 2>&1') != 0) {
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logger ($config, " [E] Could not start snmptrapd.", 1);
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print_message ($config, " [E] Could not start snmptrapd.", 1);
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return undef;
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}
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# Call the constructor of the parent class
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my $self = $class->SUPER::new($config, 2, $dbh);
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bless $self, $class;
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return $self;
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}
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###############################################################################
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# Run.
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###############################################################################
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sub run ($) {
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my $self = shift;
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my $pa_config = $self->getConfig ();
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print_message ($pa_config, " [*] Starting Pandora FMS SNMP Console.", 1);
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$self->SUPER::run (\&PandoraFMS::SNMPServer::pandora_snmptrapd);
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}
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##########################################################################
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# Process SNMP log file.
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##########################################################################
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sub pandora_snmptrapd {
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my $self = shift;
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my $pa_config = $self->getConfig ();
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eval {
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# Connect to the DB
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my $dbh = db_connect ($pa_config->{'dbengine'}, $pa_config->{'dbname'}, $pa_config->{'dbhost'},
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$pa_config->{'dbport'}, $pa_config->{'dbuser'}, $pa_config->{'dbpass'});
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$self->setDBH ($dbh);
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# Wait for the SNMP log file to be available
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my $log_file = $pa_config->{'snmp_logfile'};
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sleep ($pa_config->{'server_threshold'}) while (! -e $log_file);
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open (SNMPLOGFILE, $log_file) or return;
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# Process index file, if available
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my ($idx_file, $last_line, $last_size) = ($log_file . '.index', 0, 0);
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if (-e $idx_file) {
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open (INDEXFILE, $idx_file) or return;
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my $idx_data = <INDEXFILE>;
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close INDEXFILE;
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($last_line, $last_size) = split(/\s+/, $idx_data);
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}
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my $log_size = (stat ($log_file))[7];
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# New SNMP log file found
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if ($log_size < $last_size) {
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unlink ($idx_file);
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($last_line, $last_size) = (0, 0);
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}
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# Skip already processed lines
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readline SNMPLOGFILE for (1..$last_line);
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# Main loop
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while (1) {
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while (my $line = <SNMPLOGFILE>) {
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$last_line++;
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$last_size = (stat ($log_file))[7];
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chomp ($line);
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# Update index file
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open INDEXFILE, '>' . $idx_file;
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print INDEXFILE $last_line . ' ' . $last_size;
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close INDEXFILE;
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# Skip lines other than SNMP Trap logs
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next unless ($line =~ m/^SNMPv[12]\[\*\*\]/);
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(my $trap_ver, $line) = split(/\[\*\*\]/, $line, 2);
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# Process SNMP filter
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next if (matches_filter ($dbh, $pa_config, $line) == 1);
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logger($pa_config, "Reading trap '$line'", 10);
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my ($date, $time, $source, $oid, $type, $type_desc, $value, $data) = ('', '', '', '', '', '', '', '');
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if ($trap_ver eq "SNMPv1") {
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($date, $time, $source, $oid, $type, $type_desc, $value, $data) = split(/\[\*\*\]/, $line, 8);
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$value = limpia_cadena ($value);
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# Try to save as much information as possible if the trap could not be parsed
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$oid = $type_desc if ($oid eq '' || $oid eq '.');
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} elsif ($trap_ver eq "SNMPv2") {
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($date, $time, $source, $data) = split(/\[\*\*\]/, $line, 4);
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my @data = split(/\t/, $data);
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shift @data; # Drop unused 1st data.
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$oid = shift @data;
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if (!defined($oid)) {
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logger($pa_config, "[W] snmpTrapOID not found (Illegal SNMPv2 trap?)", 1);
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next;
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}
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$oid =~ s/.* = OID: //;
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$data = join("\t", @data);
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}
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if ($trap_ver eq "SNMPv2" || $pa_config->{'snmp_pdu_address'} eq '1' ) {
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# extract IP address from %b part:
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# * destination part (->[dest_ip]:dest_port) appears in Net-SNMP > 5.3
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# * protocol name (TCP: or UDP:) and bracketted IP addr w/ port number appear in
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# Net-SNMP > 5.1 (Net-SNMP 5.1 has IP addr only).
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# * port number is signed (often negative) in Net-SNMP 5.2
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$source =~ s/(?:(?:TCP|UDP):\s*)?\[?([^] ]+)\]?(?::-?\d+)?(?:\s*->.*)?$/$1/;
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}
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my $timestamp = $date . ' ' . $time;
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my ($custom_oid, $custom_type, $custom_value) = ('', '', '');
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# custom_type, custom_value is not used since 4.0 version, all custom data goes on custom_oid
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$custom_oid = $data;
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# Insert the trap into the DB
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if (! defined(enterprise_hook ('snmp_insert_trap', [$pa_config, $source, $oid, $type, $value, $custom_oid, $custom_value, $custom_type, $timestamp, $self->getServerID (), $dbh]))) {
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my $trap_id = db_insert ($dbh, 'id_trap', 'INSERT INTO ttrap (timestamp, source, oid, type, value, oid_custom, value_custom, type_custom) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
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$timestamp, $source, $oid, $type, $value, $custom_oid, $custom_value, $custom_type);
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logger ($pa_config, "Received SNMP Trap from $source", 4);
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# Evaluate alerts for this trap
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pandora_evaluate_snmp_alerts ($pa_config, $trap_id, $source, $oid, $type, $oid, $value, $custom_oid, $dbh);
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}
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}
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sleep ($pa_config->{'server_threshold'});
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}
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};
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if ($@) {
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$self->setErrStr ($@);
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}
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}
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########################################################################################
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# Stop the server, killing snmptrapd before.
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########################################################################################
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sub stop () {
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my $self = shift;
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system ('kill -9 `cat /var/run/pandora_snmptrapd.pid 2> /dev/null`');
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unlink ('/var/run/pandora_snmptrapd.pid');
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$self->SUPER::stop ();
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}
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########################################################################################
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# Returns 1 if the given string matches any SNMP filter, 0 otherwise.
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########################################################################################
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sub matches_filter ($$$) {
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my ($dbh, $pa_config, $string) = @_;
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# Get filters
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my @filters = get_db_rows ($dbh, 'SELECT filter FROM tsnmp_filter');
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foreach my $filter (@filters) {
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my $regexp = safe_output($filter->{'filter'}) ;
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my $eval_result;
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# eval protects against server down (by invalid regular expressions)
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$eval_result = eval {
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$string =~ m/$regexp/i ;
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};
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if ($eval_result) {
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logger($pa_config, "Trap '$string' matches filter '$regexp'. Discarding...", 10);
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return 1;
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}
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}
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return 0;
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}
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1;
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__END__
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