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#!/usr/bin/env perl |
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# -*- mode: perl; coding: iso-8859-1 -*- |
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# Author: Peter Corlett |
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# Contact: abuse@cabal.org.uk |
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# Revision: $Revision$ |
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# Date: $Date$ |
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# Copyright: (c) 2005 Peter Corlett - All Rights Reserved |
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package SNMP::Server::Logtail; |
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require v5.8.1; # need 5.8.1 for reliable threads |
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6404
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use strict; |
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use vars qw( $VERSION @ISA @EXPORT ); |
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# $Id: Logtail.pm 35 2005-09-27 13:27:28Z abuse $ |
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$VERSION = do { my @r=(q$Revision: 35 $=~/\d+/g); sprintf "%d."."%03d"x$#r,@r }; |
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@EXPORT=qw( snmpd_init add_oidmap add_logfile snmpd_run ); |
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@ISA=qw( Exporter ); |
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3075
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use threads; |
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use threads::shared; |
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use CGI::Carp qw(set_progname); |
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use Data::Dumper; |
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require Exporter; |
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# This hash contains the counters for various events |
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my %counter; |
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share %counter; |
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my $stop=0; |
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share $stop; |
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my %oidmap; |
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my %oidnext; |
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my $running; |
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my @threads; |
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my $prefix; |
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=head1 NAME |
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SNMP::Server::Logtail - Tails logfiles and presents counters via SNMP |
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=head1 SYNOPSIS |
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#!/usr/bin/perl |
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use SNMP::Server::Logtail; |
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49
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sub exim_mainlog { |
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my($hash, $line)=@_; |
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$hash->{MSG_IN}++ if /^<= /; |
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$hash->{MSG_OUT}++ if /^=> /; |
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# etc |
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} |
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snmpd_init( -logfile => '/tmp/testlog', |
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-prefix => '.1.3.6.1.4.1.2021.255' ); |
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add_oidmap( MSG_IN => 1, |
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MSG_OUT => 2 ); |
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add_logfile('/var/log/exim/mainlog' => \&exim_mainlog); |
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snmpd_run(); |
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=head1 DESCRIPTION |
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65
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This module implements the core functionality that combines with the |
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Net-SNMP SNMP daemon (not to be confused with the Net::SNMP Perl |
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module) which allows you to monitor updates to a logfile. Typically, |
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it's used to present a MIB of counters that increment whenever certain |
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events are logged. It also detects when the logfile has been rotated |
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and will start monitoring the new logfile when this occurs. |
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72
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The example in SYNOPSIS above is a complete program that Net-SNMP can |
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use. Note that this module imports functions into your namespace, has |
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global variables, and is generally hostile to your script doing |
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anything other than purely being a client to it. This is intentional. |
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To tell Net-SNMP about your new MIB and script, insert the following |
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line into I: |
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80
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pass_persist .1.3.6.1.4.1.2021.255 /path/to/script.pl |
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82
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and then reload Net-SNMP. You can then perform a SNMP query: |
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84
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snmpget -v 1 -c public localhost .1.3.6.1.4.1.2021.255.1 |
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86
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You can obviously also read this by using Net::SNMP, MRTG, or similar. |
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88
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The function set with add_logfile() is called back whenever a new |
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entry appears in the logfile. It is passed a hash reference and single |
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lines from the logfile. The function may use the hash as it sees fit, |
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although normally it would just increment/set values in the hash as |
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new log data becomes available to it. |
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The arguments given to add_oidmap() define which entries in the hash |
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are read whenever a SNMP query is made. It contains key/value pairs. |
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The key corresponds to keys in the hash which are read - the value is |
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the suffix of the OID that causes this read. (The OID's prefix is |
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given in snmpd_init.) |
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100
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=head1 FUNCTIONS |
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102
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=over 4 |
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104
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=item B |
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106
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snmpd_init( -logfile => '/tmp/testlog', |
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-prefix => '.1.3.6.1.4.1.2021.255' ); |
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109
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Initialises the global state for the log tailer. This script's own |
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diagnostics goes to the logfile given with B<-logfile> and the base |
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OID for the MIB you're creating is given with B<-prefix>. |
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113
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=cut |
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115
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sub snmpd_init { |
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my(%opts)=@_; |
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118
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my $logfile=$opts{-logfile}; |
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croak "-logfile not set" unless defined $logfile; |
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$prefix=$opts{-prefix}; |
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croak "-prefix not set" unless defined $prefix; |
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my $logname=$opts{-logname} || $0; |
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open STDERR, '>>', $logfile |
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or croak "Can't create/append $logfile: $!"; |
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set_progname("${logname}[$$]"); |
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$running++; |
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warn "Started\n"; |
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$|=1; |
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} |
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133
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sub END { |
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warn "Crashed!\n" |
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if $running; |
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} |
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138
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=item B |
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140
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add_oidmap( ACCEPT => 1, |
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REJECT => 2 ); |
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143
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This adds a mapping of keywords to OIDs. |
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145
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=cut |
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147
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sub add_oidmap { |
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%oidmap=(%oidmap, reverse @_); |
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150
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my @oids=sort {$a<=>$b} keys %oidmap; |
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$oidnext{''}=$oids[0]; |
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foreach(1..$#oids) { |
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$oidnext{$oids[$_-1]}=$oids[$_]; |
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} |
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} |
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157
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sub run_monitor { |
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my($logname, $subref)=@_; |
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warn "Starting monitoring $logname\n"; |
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my $first=1; |
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until($stop) { |
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open LOG, '<', $logname |
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or croak "Can't open $logname: $!"; |
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my($curinode, $cursize)=(stat LOG)[(1, 7)]; |
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if($first) { |
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# If this is the first run (i.e. the logfile hasn't been rotate |
167
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# on us) we seek to the end of the file and start tailing from |
168
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# there. This is so that all the previous entries in the logfile |
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# don't appear all at once and be potentially graphed as |
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# happening in the last moment. |
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seek LOG, 2, 0; |
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$first=0; |
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} |
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my $rotated=0; |
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until($rotated || $stop) { |
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my($newinode, $newsize)=(stat $logname)[(1, 7)]; |
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while(my $line=) { |
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lock %counter; |
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&{$subref}(\%counter, $line); |
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#print "\033[H\033[J", Dumper \%counter, scalar localtime; |
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last if $stop; |
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} |
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sleep 1; |
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# has logfile been rotated? |
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if(defined $newinode && ( |
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$newinode != $curinode # file has been rotated |
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|| $newsize < $cursize # file has been truncated |
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) |
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) { |
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$rotated=1; |
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warn "Log rotated, will reopen $logname\n"; |
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} |
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} |
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} |
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warn "Stopped monitoring $logname\n"; |
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} |
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198
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199
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=item B |
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201
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add_logfile('/var/log/exim/mainlog' => \&exim_mainlog); |
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203
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This adds another logfile to be monitored, and registers a callback |
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function which will be called for each new line that appears in the |
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logfile. |
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207
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=cut |
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209
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sub add_logfile { |
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my($logname, $subref)=@_; |
211
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my $thread=threads->create('run_monitor', $logname, $subref); |
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push @threads, $thread; |
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} |
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215
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=item B |
216
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217
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snmpd_run(); |
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219
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This starts the main loop. Control will return when Net-SNMP is shut |
220
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down, so you should only clean up and exit after this occurs. |
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222
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=cut |
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224
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sub snmpd_run { |
225
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while (my $command=) { |
226
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chomp $command; |
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if ($command=~/^PING/){ |
228
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#warn "Answering snmpd PING\n" if $DEBUG; |
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print "PONG\n"; |
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next; |
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} |
232
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my $oid=<>; |
233
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chomp $oid; |
234
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my($suffix)=$oid=~/^$prefix\.?(.*)$/o; |
235
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$suffix='' unless defined $suffix; |
236
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if ($command eq "getnext") { |
237
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#warn "Answering getnext for suffix $suffix\n" if $DEBUG; |
238
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if(exists $oidnext{$suffix}) { |
239
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$suffix=$oidnext{$suffix}; |
240
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} else { |
241
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$suffix='NONE'; |
242
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} |
243
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} |
244
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#warn "Answering get for suffix $suffix\n" if $DEBUG; |
245
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if(exists $oidmap{$suffix}) { |
246
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lock %counter; |
247
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my $value=$counter{$oidmap{$suffix}} || 0; |
248
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$value &= 0xffffffff; |
249
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print "$prefix.$suffix\ncounter\n$value\n"; |
250
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} else { |
251
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print "NONE\n"; |
252
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} |
253
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} |
254
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255
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|
|
warn "Shutting down...\n"; |
256
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|
$stop=1; |
257
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|
$_->join foreach @threads; |
258
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|
warn "Stopped\n"; |
259
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|
|
$running=0; |
260
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} |
261
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262
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|
|
=back |
263
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264
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|
|
=head1 BUGS |
265
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266
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|
|
This documentation is terrible. Reading the example client may be more |
267
|
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|
|
helpful. |
268
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269
|
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|
|
=head1 SEE ALSO |
270
|
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|
271
|
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|
|
|
|
Net::SNMP |
272
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273
|
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|
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|
|
=head1 AUTHOR |
274
|
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|
|
275
|
|
|
|
|
|
|
All code and documentation by Peter Corlett . |
276
|
|
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|
277
|
|
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|
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|
|
=head1 COPYRIGHT |
278
|
|
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|
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|
|
|
279
|
|
|
|
|
|
|
Copyright (C) 2004 Peter Corlett . All rights |
280
|
|
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|
|
|
|
reserved. |
281
|
|
|
|
|
|
|
|
282
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify |
283
|
|
|
|
|
|
|
it under the same terms as Perl itself. |
284
|
|
|
|
|
|
|
|
285
|
|
|
|
|
|
|
=head1 SUPPORT / WARRANTY |
286
|
|
|
|
|
|
|
|
287
|
|
|
|
|
|
|
This is free software. IT COMES WITHOUT WARRANTY OF ANY KIND. |
288
|
|
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|
|
|
|
|
289
|
|
|
|
|
|
|
=cut |
290
|
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|
|
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|
|
291
|
|
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|
|
|
|
1; |
292
|
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|