548 lines
19 KiB
Perl
548 lines
19 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 Time::HiRes qw(usleep);
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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::ProducerConsumerServer;
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# Inherits from PandoraFMS::ProducerConsumerServer
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our @ISA = qw(PandoraFMS::ProducerConsumerServer);
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# Global variables
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my @TaskQueue :shared;
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my %PendingTasks :shared;
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my $Sem :shared;
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my $TaskSem :shared;
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# Trap statistics by agent
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my %AGENTS = ();
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# Index and buffer management for trap log files
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my $SNMPTRAPD = { 'log_file' => '', 'fd' => undef, 'idx_file' => '', 'last_line' => 0, 'last_size' => 0, 'read_ahead_line' => '', 'read_ahead_pos' => 0 };
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my $DATASERVER = { 'log_file' => '', 'fd' => undef, 'idx_file' => '', 'last_line' => 0, 'last_size' => 0, 'read_ahead_line' => '', 'read_ahead_pos' => 0 };
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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 $config->{'snmpconsole'} == 1;
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# Start snmptrapd
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if (start_snmptrapd ($config) != 0) {
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return undef;
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}
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# Wait for the SNMP log file to be available
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$SNMPTRAPD->{'log_file'} = $config->{'snmp_logfile'};
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sleep ($config->{'server_threshold'}) if (! -e $SNMPTRAPD->{'log_file'});
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if (!open ($SNMPTRAPD->{'fd'}, $SNMPTRAPD->{'log_file'})) {
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logger ($config, ' [E] Could not open the SNMP log file ' . $SNMPTRAPD->{'log_file'} . ".", 1);
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print_message ($config, ' [E] Could not open the SNMP log file ' . $SNMPTRAPD->{'log_file'} . ".", 1);
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return 1;
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}
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init_log_file($config, $SNMPTRAPD);
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# Create the Data Server SNMP log file if it does not exist.
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if (defined($config->{'snmp_extlog'}) && $config->{'snmp_extlog'} ne '') {
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$DATASERVER->{'log_file'} = $config->{'snmp_extlog'};
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open(TMPFD, '>', $DATASERVER->{'log_file'}) && close(TMPFD) if (! -e $DATASERVER->{'log_file'});
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if (!open ($DATASERVER->{'fd'}, $DATASERVER->{'log_file'})) {
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logger ($config, ' [E] Could not open the Data Server SNMP log file ' . $DATASERVER->{'log_file'} . ".", 1);
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print_message ($config, ' [E] Could not open the Data Server SNMP log file ' . $DATASERVER->{'log_file'} . ".", 1);
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return 1;
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}
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init_log_file($config, $DATASERVER);
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}
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# Initialize semaphores and queues
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@TaskQueue = ();
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%PendingTasks = ();
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$Sem = Thread::Semaphore->new;
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$TaskSem = Thread::Semaphore->new (0);
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# Call the constructor of the parent class
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my $self = $class->SUPER::new($config, SNMPCONSOLE, \&PandoraFMS::SNMPServer::data_producer, \&PandoraFMS::SNMPServer::data_consumer, $dbh);
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# Save the path of snmptrapd
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$self->{'snmp_trapd'} = $config->{'snmp_trapd'};
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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 " . $pa_config->{'rb_product_name'} . " SNMP Console.", 2);
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# Set the initial date for storm protection.
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$pa_config->{"__storm_ref__"} = time();
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$self->setNumThreads ($pa_config->{'snmpconsole_threads'});
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$self->SUPER::run (\@TaskQueue, \%PendingTasks, $Sem, $TaskSem);
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}
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###############################################################################
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# Data producer.
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###############################################################################
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sub data_producer ($) {
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my $self = shift;
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my ($pa_config, $dbh) = ($self->getConfig (), $self->getDBH ());
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my @tasks;
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# Reset storm protection counters
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my $curr_time = time ();
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if ($pa_config->{"__storm_ref__"} + $pa_config->{"snmp_storm_timeout"} < $curr_time) {
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$pa_config->{"__storm_ref__"} = $curr_time;
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%AGENTS = ();
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}
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for my $fs (($SNMPTRAPD, $DATASERVER)) {
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next unless defined($fs->{'fd'});
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reset_if_truncated($pa_config, $fs);
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while (my $line_with_pos = read_snmplogfile($fs)) {
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my $line;
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$fs->{'last_line'}++;
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($fs->{'last_size'}, $line) = @$line_with_pos;
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chomp ($line);
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# Update index file
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open(my $idxfd, '>' . $fs->{'idx_file'});
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print $idxfd $fs->{'last_line'} . ' ' . $fs->{'last_size'};
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close $idxfd;
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set_file_permissions($pa_config, $fs->{'idx_file'}, "0666");
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# Skip lines other than SNMP Trap logs
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next unless ($line =~ m/^SNMPv[12]\[\*\*\]/);
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# Storm protection.
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my ($ver, $date, $time, $source, $null) = split(/\[\*\*\]/, $line, 5);
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next unless defined ($source);
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if (! defined ($AGENTS{$source})) {
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$AGENTS{$source}{'count'} = 1;
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$AGENTS{$source}{'event'} = 0;
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} else {
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$AGENTS{$source}{'count'} += 1;
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}
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if ($pa_config->{'snmp_storm_protection'} > 0 && $AGENTS{$source}{'count'} > $pa_config->{'snmp_storm_protection'}) {
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if ($AGENTS{$source}{'event'} == 0) {
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pandora_event ($pa_config, "Too many traps coming from $source. Silenced for " . int ($pa_config->{"snmp_storm_timeout"} / 60) . " minutes.", 0, 0, 4, 0, 0, 'system', 0, $dbh);
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}
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$AGENTS{$source}{'event'} = 1;
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next;
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}
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push (@tasks, $line);
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}
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}
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return @tasks;
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}
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###############################################################################
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# Data consumer.
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###############################################################################
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sub data_consumer ($$) {
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my ($self, $task) = @_;
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pandora_snmptrapd ($self->getConfig (), $task, $self->getServerID (), $self->getDBH ());
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}
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##########################################################################
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# Process SNMP log file.
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##########################################################################
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sub pandora_snmptrapd {
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my ($pa_config, $line, $server_id, $dbh) = @_;
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(my $trap_ver, $line) = split(/\[\*\*\]/, $line, 2);
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# Process SNMP filter
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return if (matches_filter ($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 '' || $oid eq '.');
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if (!defined($oid)) {
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logger($pa_config, "[W] snmpTrapOID not found (Illegal SNMPv1 trap?)", 5);
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return;
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}
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} elsif ($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?)", 5);
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return;
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}
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$oid =~ s/.* = OID: //;
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if ($oid =~ m/^\.1\.3\.6\.1\.6\.3\.1\.1\.5\.([1-5])$/) {
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$type = $1 - 1;
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} else {
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$type = 6;
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}
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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 = $data;
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#Trap forwarding
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if ($pa_config->{'snmp_forward_trap'}==1) {
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my $trap_data_string = "";
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#We loop through all the custom data of the received trap, creating the $trap_data_string string to forward the trap properly
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while ($data =~ /([\.\d]+)\s=\s([^:]+):\s([\S ]+)/g) {
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my ($trap_data, $trap_type, $trap_value) = ($1, $2, $3);
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if ($trap_type eq "INTEGER") {
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#FIX for translated traps from IF-MIB.txt MIB
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$trap_value =~ s/\D//g;
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$trap_data_string = $trap_data_string . "$trap_data i $trap_value ";
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}
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elsif ($trap_type eq "UNSIGNED"){
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$trap_data_string = $trap_data_string . "$trap_data u $trap_value ";
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}
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elsif ($trap_type eq "COUNTER32"){
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$trap_data_string = $trap_data_string . "$trap_data c $trap_value ";
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}
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elsif ($trap_type eq "STRING"){
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$trap_data_string = $trap_data_string . "$trap_data s $trap_value ";
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}
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elsif ($trap_type eq "HEX STRING"){
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$trap_data_string = $trap_data_string . "$trap_data x $trap_value ";
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}
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elsif ($trap_type eq "DECIMAL STRING"){
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$trap_data_string = $trap_data_string . "$trap_data d $trap_value ";
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}
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elsif ($trap_type eq "NULLOBJ"){
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$trap_data_string = $trap_data_string . "$trap_data n $trap_value ";
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}
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elsif ($trap_type eq "OBJID"){
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$trap_data_string = $trap_data_string . "$trap_data o $trap_value ";
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}
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elsif ($trap_type eq "TIMETICKS"){
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$trap_data_string = $trap_data_string . "$trap_data t $trap_value ";
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}
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elsif ($trap_type eq "IPADDRESS"){
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$trap_data_string = $trap_data_string . "$trap_data a $trap_value ";
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}
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elsif ($trap_type eq "BITS"){
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$trap_data_string = $trap_data_string . "$trap_data b $trap_value ";
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}
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}
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#We distinguish between the three different kinds of SNMP forwarding
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if ($pa_config->{'snmp_forward_version'} eq '3') {
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system("snmptrap -v $pa_config->{'snmp_forward_version'} -n \"\" -a $pa_config->{'snmp_forward_authProtocol'} -A $pa_config->{'snmp_forward_authPassword'} -x $pa_config->{'snmp_forward_privProtocol'} -X $pa_config->{'snmp_forward_privPassword'} -l $pa_config->{'snmp_forward_secLevel'} -u $pa_config->{'snmp_forward_secName'} -e $pa_config->{'snmp_forward_engineid'} $pa_config->{'snmp_forward_ip'} '' $oid $trap_data_string");
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}
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elsif ($pa_config->{'snmp_forward_version'} eq '2' || $pa_config->{'snmp_forward_version'} eq '2c') {
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system("snmptrap -v 2c -n \"\" -c $pa_config->{'snmp_forward_community'} $pa_config->{'snmp_forward_ip'} '' $oid $trap_data_string");
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}
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elsif ($pa_config->{'snmp_forward_version'} eq '1') {
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#Because of tne SNMP v1 protocol, we must perform additional steps for creating the trap
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my $value_sending = "";
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my $type_sending = "";
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if ($value eq ''){
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$value_sending = "\"\"";
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}
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else {
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$value_sending = $value;
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$value_sending =~ s/[\$#@~!&*()\[\];.,:?^ `\\\/]+//g;
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}
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if ($type eq ''){
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$type_sending = "\"\"";
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}
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else{
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$type_sending = $type;
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}
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system("snmptrap -v 1 -c $pa_config->{'snmp_forward_community'} $pa_config->{'snmp_forward_ip'} $oid \"\" $type_sending $value_sending \"\" $trap_data_string");
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}
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}
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# Insert the trap into the DB
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if (! defined(enterprise_hook ('snmp_insert_trap', [$pa_config, $source, $oid, $type, $value, $custom_oid, $custom_value, $custom_type, $timestamp, $server_id, $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, $dbh);
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}
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# Delay the consumption of the next task.
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sleep($pa_config->{'snmp_delay'}) if ($pa_config->{'snmp_delay'} > 0);
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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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my @filter_unique_functions = get_db_rows ($dbh, 'SELECT DISTINCT(unified_filters_id) FROM tsnmp_filter ORDER BY unified_filters_id');
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foreach my $filter_unique_func (@filter_unique_functions) {
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# Get filters
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my @filters = get_db_rows ($dbh, 'SELECT filter FROM tsnmp_filter WHERE unified_filters_id = ' . $filter_unique_func->{'unified_filters_id'});
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my $eval_acum = 1;
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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 && $eval_acum) {
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$eval_acum = 1;
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}
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else {
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$eval_acum = 0;
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last;
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}
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}
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if ($eval_acum) {
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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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########################################################################################
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# Start snmptrapd, attempting to kill it if it is already running. Returns 0 if
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# successful, 1 otherwise.
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########################################################################################
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sub start_snmptrapd ($) {
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my ($config) = @_;
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my $pid_file = '/var/run/pandora_snmptrapd.pid';
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my $snmptrapd_running = 0;
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# Manual start of snmptrapd
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if ($config->{'snmp_trapd'} eq 'manual') {
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logger ($config, "No SNMP trap daemon configured. Start snmptrapd manually.", 1);
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print_message ($config, " [*] No SNMP trap daemon configured. Start snmptrapd manually.", 1);
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if (! -f $config->{'snmp_logfile'}) {
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logger ($config, "SNMP log file " . $config->{'snmp_logfile'} . " not found.", 1);
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print_message ($config, " [E] SNMP log file " . $config->{'snmp_logfile'} . " not found.", 1);
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return 1;
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}
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return 0;
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}
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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';
|
|
|
|
if (system ($config->{'snmp_trapd'} . $snmptrapd_args . " >$DEVNULL 2>&1") != 0) {
|
|
logger ($config, " [E] Could not start snmptrapd.", 1);
|
|
print_message ($config, " [E] Could not start snmptrapd.", 1);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
###############################################################################
|
|
# Read SNMP Log file with buffering (to handle multi-line Traps).
|
|
# Return reference of array (file-pos, line-data) if successful, undef othersise.
|
|
###############################################################################
|
|
sub read_snmplogfile($) {
|
|
my ($fs) = @_;
|
|
my $line;
|
|
my $pos;
|
|
|
|
if(defined($fs->{'read_ahead_line'})) {
|
|
# Restore saved line
|
|
$line = $fs->{'read_ahead_line'};
|
|
$pos = $fs->{'read_ahead_pos'};
|
|
}
|
|
else {
|
|
# No saved line
|
|
my $fd = $fs->{'fd'};
|
|
$line = <$fd>;
|
|
$pos = tell($fs->{'fd'});
|
|
}
|
|
|
|
return undef if (! defined($line));
|
|
|
|
my $retry_count = 0;
|
|
|
|
# More lines ?
|
|
while(1) {
|
|
my $fd = $fs->{'fd'};
|
|
while($fs->{'read_ahead_line'} = <$fd>) {
|
|
|
|
# Get current file position
|
|
$fs->{'read_ahead_pos'} = tell($fs->{'fd'});
|
|
|
|
# Get out of the loop if you find another Trap
|
|
last if($fs->{'read_ahead_line'} =~ /^SNMP/ );
|
|
|
|
# $fs->{'read_ahead_line'} looks continued line...
|
|
|
|
# Append to the line and correct the position
|
|
chomp($line);
|
|
$line .= "$fs->{'read_ahead_line'}";
|
|
$pos = $fs->{'read_ahead_pos'};
|
|
}
|
|
|
|
# if $line looks incomplete, try to get continued line
|
|
# just within 10sec. After that, giving up to complete it
|
|
# and flush $line as it is.
|
|
last if(chomp($line) > 0 || $retry_count++ >= 10);
|
|
|
|
sleep(1);
|
|
}
|
|
|
|
# return fetched line with file position to be saved.
|
|
return [$pos, $line];
|
|
}
|
|
|
|
###############################################################################
|
|
# Initialize the fs structure for a trap log file.
|
|
###############################################################################
|
|
sub init_log_file($$$) {
|
|
my ($config, $fs) = @_;
|
|
|
|
# Process index file, if available
|
|
($fs->{'idx_file'}, $fs->{'last_line'}, $fs->{'last_size'}) = ($fs->{'log_file'} . '.index', 0, 0);
|
|
if (-e $fs->{'idx_file'}) {
|
|
open (my $idxfd, $fs->{'idx_file'}) or return;
|
|
my $idx_data = <$idxfd>;
|
|
close $idxfd;
|
|
($fs->{'last_line'}, $fs->{'last_size'}) = split(/\s+/, $idx_data);
|
|
}
|
|
my $log_size = (stat ($fs->{'log_file'}))[7];
|
|
|
|
# New SNMP log file found
|
|
if ($log_size < $fs->{'last_size'}) {
|
|
unlink ($fs->{'idx_file'});
|
|
($fs->{'last_line'}, $fs->{'last_size'}) = (0, 0);
|
|
}
|
|
|
|
# Skip already processed lines
|
|
read_snmplogfile($fs) for (1..$fs->{'last_line'});
|
|
}
|
|
|
|
###############################################################################
|
|
# Reset the index if the file has been truncated.
|
|
###############################################################################
|
|
sub reset_if_truncated($$) {
|
|
my ($pa_config, $fs) = @_;
|
|
|
|
my $log_size = (stat ($fs->{'log_file'}))[7];
|
|
|
|
# New SNMP log file found
|
|
if ($log_size < $fs->{'last_size'}) {
|
|
logger ($pa_config, 'File ' . $fs->{'log_file'} . ' was truncated.', 10);
|
|
unlink ($fs->{'idx_file'});
|
|
($fs->{'last_line'}, $fs->{'last_size'}) = (0, 0);
|
|
seek($fs->{'fd'}, 0, 0);
|
|
}
|
|
}
|
|
|
|
###############################################################################
|
|
# Clean-up when the server is destroyed.
|
|
###############################################################################
|
|
sub DESTROY {
|
|
my $self = shift;
|
|
|
|
if ($self->{'snmp_trapd'} ne 'manual') {
|
|
system ("kill -9 `cat /var/run/pandora_snmptrapd.pid 2>$DEVNULL`");
|
|
unlink ('/var/run/pandora_snmptrapd.pid');
|
|
}
|
|
}
|
|
|
|
1;
|
|
__END__
|