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#!/usr/bin/perl |
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# |
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# Copyright (C) Nikhef 2011 |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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# Author: |
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# Mischa Sall\'e <msalle@nikhef.nl> |
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# NIKHEF Amsterdam, the Netherlands |
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# |
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######################################################################## |
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# |
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# Nagios probe to test functioning of gLExec |
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# |
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# Nagios state can be one of the following: |
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# - Missing glexec command: CRITICAL |
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# - input proxies empty: UNKNOWN |
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# - short timeout exceeded: WARNING |
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# - timeout exceeded: CRITICAL |
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# - gLExec exit codes: |
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# 0 glexec succeeded: OK |
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# 201 Client error: CRITICAL |
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# 202 Internal error: CRITICAL |
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# 203 Auth error: CRITICAL |
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# 204 Overlap: CRITICAL |
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# 126 execve failed: WARNING |
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# 128+n signal: WARNING |
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# !=0 rc of payload: WARNING |
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# |
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######################################################################## |
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|
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# DEFAULTS |
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my $probeversion=0.2; |
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|
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# Note the following defaults can be overridden using cmdline options |
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my $deftimeout=10; # Overall timeout for probe |
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my $defcritical=8; # When to send SIGTERM |
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my $defwarning=5; # When to warn about slow running |
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my $defpayload="id -a"; # Which payload to run |
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|
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######################################################################## |
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# Logging package |
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# keeps internal log trace which can be dumped with dump_log |
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######################################################################## |
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package logger; |
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use strict; |
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use warnings; |
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{ |
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my $loglevel; |
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my @logstring; |
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|
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# Constructor |
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sub new { |
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my $classname=shift; |
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my $self={}; bless $self; |
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my $level=shift; |
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if (defined $level) { |
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$self->set_loglevel($level); |
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} else { |
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$loglevel=0; |
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} |
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return $self; |
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} |
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|
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# Sets loglevel |
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sub set_loglevel($) { |
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my $self=shift; |
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my $level=shift; |
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$loglevel=$level; |
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} |
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|
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# Logging function: log_func(priority, "logstring\n"); |
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sub log_func($@) { |
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my $self=shift; |
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my $prio=shift; |
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return if ($prio > $loglevel); |
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for my $line (@_) { |
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push @logstring,$line; |
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} |
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} |
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|
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# Dumps log |
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sub get_log(@) { |
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my $self=shift; |
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foreach my $myentry ( @logstring ) { |
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print $myentry; |
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} |
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} |
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} |
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|
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######################################################################## |
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# Nagios status printing package |
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# Can set and dump nagios status output |
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######################################################################## |
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package nagstat; |
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{ |
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my $code; |
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my $summary; |
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my $perfdata; |
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my @stat; |
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|
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# Constructor |
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sub new() { |
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my $classname=shift; |
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my $self={}; bless $self; |
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$code=3; # Default status unknown |
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$summary=undef; |
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$perfdata=undef; |
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@stat=("OK","WARNING","CRITICAL","UNKNOWN"); |
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return $self; |
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} |
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|
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# Set nagios code (0-3) plus summary |
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sub set_status($$) { |
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my $self=shift; |
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if (!defined $summary) { |
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$code=shift; |
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$summary=shift; |
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} |
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} |
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|
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# Set internal performance data |
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sub set_perfdata($) { |
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my $self=shift; |
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$perfdata=shift; |
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} |
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|
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# Printout nagios status, summary and optionally performance data |
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# return value is code (0-3) |
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sub get_status { |
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if (!defined $summary) { |
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$summary="unknown status"; |
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} |
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if (defined $perfdata) { |
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print $stat[$code].": ".$summary."|".$perfdata."\n"; |
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} else { |
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print $stat[$code].": ".$summary."\n"; |
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} |
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return $code; |
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} |
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} |
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|
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######################################################################## |
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# Inter process communication package for nagios probes |
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# Starts alarm handler when receiving alarm which checks status of |
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# probe, and terminates or kills it. |
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######################################################################## |
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package probeipc; |
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use POSIX ":sys_wait_h"; |
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use Time::HiRes qw(alarm); |
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{ |
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my $pid; |
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my $wpid; |
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my $status; |
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my $numsent; |
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my $killtime; |
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my $termtime; |
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my $exitfunc; |
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|
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# Constructor: new(exitfunc,[kill time], [term time]) |
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sub new() { |
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my $classname=shift; |
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my $self={}; bless $self; |
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my $exitfunc=shift or die ($classname."::new() needs exitfunc arg\n"); |
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my $killtime=(shift or 10); # probe default timeout is 10 |
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my $termtime=(shift or $killtime); |
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$self->set_exitfunc($exitfunc); |
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$self->set_killtime($killtime); |
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$self->set_termtime($termtime); |
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$pid=-1; |
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$wpid=0; |
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$status=0; |
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$numsent=0; |
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$SIG{'ALRM'} = \&alarm_handler; |
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$SIG{'INT'} = \&int_handler; |
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$SIG{'TERM'} = \&int_handler; |
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return $self; |
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} |
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|
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# Sets time after which to send SIGKILL |
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sub set_killtime($) { |
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my $self=shift; |
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$killtime=shift; |
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} |
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|
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# Sets time after which to send SIGTERM |
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sub set_termtime($) { |
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my $self=shift; |
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$termtime=shift; |
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} |
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|
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# Sets function to call when exiting after sending a SIGKILL |
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sub set_exitfunc($) { |
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my $self=shift; |
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$exitfunc=shift; |
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} |
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|
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# Signal handler for SIGALRM |
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sub alarm_handler() { |
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my ($sig) = @_; |
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my $rc; |
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if ($pid<0) { # No pid, nothing to do |
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logger->log_func(2,"Payload hasn't started yet\n"); |
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nagstat->set_status(2,"probe killtime exceeded"); |
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&$exitfunc(); |
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} |
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# Either is or was a process: test status |
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logger->log_func(2,"subprocess is/was running with pid ".$pid."\n"); |
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if ($wpid!=0) { # process has finished (>0)or waitpid(-1) failed |
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return; |
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} |
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# Get status |
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$wpid=waitpid($pid,WNOHANG); |
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$status=$?; |
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if ($wpid==0) { # Still running |
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if ($killtime<=$termtime || $numsent==1) { |
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logger->log_func(2,"Sending SIGKILL to ".$pid."\n"); |
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kill(9,$pid); |
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nagstat->set_status(2,"probe timeout exceeded"); |
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&$exitfunc(); |
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} |
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logger->log_func(2,"Sending SIGTERM to ".$pid."\n"); |
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kill(15,$pid); |
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$numsent=1; |
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alarm($killtime-$termtime); |
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nagstat->set_status(2,"probe critical time exceeded"); |
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} |
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return; |
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} |
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|
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# Signal handler for SIGINT and SIGTERM |
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sub int_handler() { |
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my ($sig)=@_; |
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|
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logger->log_func(2,"Caught SIG$sig\n"); |
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nagstat->set_status(2,"probe interrupted with SIG$sig"); |
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if ($pid<0) { # No pid, nothing to do |
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logger->log_func(2,"Payload hasn't started yet\n"); |
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&$exitfunc(); |
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} |
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# Either is or was a process: test status |
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if ($wpid!=0) { # process has finished (>0)or waitpid(-1) failed |
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logger->log_func(2,"Subprocess with pid ".$pid." already finished\n"); |
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&$exitfunc(); |
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} |
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# Get status |
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$wpid=waitpid($pid,WNOHANG); |
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$status=$?; |
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if ($wpid==0) { # Still running: send SIGTERM |
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logger->log_func(2,"Sending SIGTERM to ".$pid."\n"); |
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kill(15,$pid); |
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} |
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&$exitfunc(); |
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} |
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|
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# Wait for specified pid and return exitcode and signal number. |
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sub wait_probe() { |
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my $self=shift; |
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my $rc; |
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my $signo; |
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|
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$wpid=waitpid($pid,0) if ($wpid<=0); |
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if ($wpid==$pid) { # probe exited here |
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alarm(0); |
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$rc=$? >> 8; |
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$signo=$? & 127; |
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} elsif ($wpid==-1) { # probe exited in sighandler |
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$rc=$status >> 8; |
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$signo=$status & 127; |
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} |
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return ($rc,$signo); |
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} |
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|
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# Starts specified command: run_probe("command",\$rc,\$signo) and returns 0 |
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# on normal exit, or 1 when command cannot be started. |
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# Output of command is stored as log info. Nagios status is set when |
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# applicable. |
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sub run_probe($$$) { |
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my $self=shift; |
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my $command=shift; |
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my $rc=shift; |
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my $signo=shift; |
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|
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# Start command |
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$pid = open(FOO, $command." 2>&1|"); |
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if (!defined($pid)) { |
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alarm(0); |
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nagstat->set_status(2,"Failed to run $command"); |
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return 1; |
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} |
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while (my $line=<FOO>) { |
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logger->log_func(3,$line); |
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} |
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($$rc,$$signo)=$self->wait_probe(); |
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return 0; |
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} |
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} |
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|
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######################################################################## |
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# Running main probe package |
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######################################################################## |
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package main; |
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use strict; |
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use warnings; |
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|
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use Env qw(@PATH GLEXEC_LOCATION GLITE_LOCATION X509_USER_PROXY GLEXEC_CLIENT_CERT); |
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use Getopt::Long qw(:config no_ignore_case bundling); |
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use Time::HiRes qw(time alarm); |
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|
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my $timeout; # Total maximum runtime for probe |
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my $critical; # Time after which to kill gLExec |
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my $warning; # Time after which to warn about slow gLExec |
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my $payload; # Payload plus arguments: relative uses $PATH to find |
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my $verbose; # Verbosity level |
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|
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# Prints usage output |
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sub usage() { |
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(my $name = $0) =~ s/.*\///; |
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print <<EOHELP; |
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Usage: $name [options] |
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|
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Options: |
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-t|--timeout <timeout> maximum runtime for probe, default: $deftimeout sec |
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-w|--warning <timeout> runtime after which to warn, default: $defwarning sec |
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-c|--critical <timeout> runtime after which to probe is to be killed, |
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default: $defcritical sec |
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-x|--x509-user-proxy <file> set X509_USER_PROXY to given file |
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-g|--glexec-client-cert <file> set GLEXEC_CLIENT_CERT to given file |
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default: value of variable X509_USER_PROXY |
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-e|--execute <cmd> command to execute by gLExec |
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default: \"$defpayload\" |
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-v|--verbose be more verbose, more -v means more verbosity |
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-V|--version print version |
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--help show this helptext |
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-h show short usage information |
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EOHELP |
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exit 0; |
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} |
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|
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# Prints short usage output (oneline) |
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sub shortusage() { |
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(my $name = $0) =~ s/.*\///; |
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print <<EOHELP; |
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Usage: $name [options] |
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EOHELP |
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} |
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|
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# Prints probe version |
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sub version() { |
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(my $name = $0) =~ s/.*\///; |
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print <<EOHELP; |
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$name version: $probeversion |
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EOHELP |
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} |
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|
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# Parses command line options and sets global variables |
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sub getopts() { |
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my $x509proxy; |
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my $clientcert; |
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my $version; |
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my $help; |
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my $shorthelp; |
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|
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$timeout=$deftimeout; |
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$critical=$defcritical; |
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$warning=$defwarning; |
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$payload=$defpayload; |
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GetOptions( |
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"t|timeout=f" => \$timeout, |
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"c|critical=f" => \$critical, |
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"w|warning=f" => \$warning, |
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"x|x509-user-proxy=s" => \$X509_USER_PROXY, |
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"g|glexec-client-cert=s" => \$GLEXEC_CLIENT_CERT, |
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"e|execute=s" => \$payload, |
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"v|verbose+" => \$verbose, |
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"help+" => \$help, |
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"h+" => \$shorthelp, |
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"V|version+" => \$version, |
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"H|host", |
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"p|port", |
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"u|url" |
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) or &usage and exit(1); |
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|
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$help and &usage and exit(0); |
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$shorthelp and &shortusage and exit(0); |
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$version and &version and exit(0); |
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if (!defined $GLEXEC_CLIENT_CERT) { |
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$GLEXEC_CLIENT_CERT=$X509_USER_PROXY; |
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} |
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$timeout=0 if ($timeout<0); |
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$critical=0 if ($critical<0); |
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$warning=0 if ($warning<0); |
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$critical=$timeout if ($timeout<$critical); |
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} |
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|
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# Exit function: prints nagios status and dumps log |
| 407 |
sub nagios_exit() { |
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my $rc=nagstat->get_status(); |
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|
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# Logging object |
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logger->get_log(); |
| 412 |
|
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exit $rc; |
| 414 |
} |
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|
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# Finds gLExec in path and pre-specified directories |
| 417 |
sub find_glexec { |
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my $self=shift; |
| 419 |
my $glexloc; |
| 420 |
my $dir; |
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my @DEFAULT_PATH=("/usr/local/sbin","/usr/sbin","/sbin", |
| 422 |
"/usr/local/bin","/usr/bin"); |
| 423 |
|
| 424 |
# Try GLEXEC_LOCATION |
| 425 |
if (defined $GLEXEC_LOCATION) { |
| 426 |
logger->log_func(3,"GLEXEC_LOCATION=".$GLEXEC_LOCATION."\n"); |
| 427 |
$glexloc=$GLEXEC_LOCATION."/sbin/glexec"; |
| 428 |
if (-x $glexloc) { |
| 429 |
logger->log_func(2,"gLExec found at ".$glexloc."\n"); |
| 430 |
return $glexloc; |
| 431 |
} |
| 432 |
logger->log_func(2,"gLExec NOT found at \$GLEXEC_LOCATION\n"); |
| 433 |
} |
| 434 |
|
| 435 |
# Try GLITE_LOCATION |
| 436 |
$GLITE_LOCATION="/opt/glite" if (!defined $GLITE_LOCATION); |
| 437 |
logger->log_func(3,"GLITE_LOCATION=".$GLITE_LOCATION."\n"); |
| 438 |
|
| 439 |
@PATH=(".") if (!$PATH[1]); |
| 440 |
|
| 441 |
for $dir (@PATH,$GLITE_LOCATION."/sbin",@DEFAULT_PATH) { |
| 442 |
logger->log_func(3,"Looking for glexec in ".$dir."\n"); |
| 443 |
$glexloc=$dir."/glexec"; |
| 444 |
if (-x $glexloc) { |
| 445 |
logger->log_func(2,"gLExec found at ".$glexloc."\n"); |
| 446 |
return $glexloc; |
| 447 |
} |
| 448 |
} |
| 449 |
return undef; |
| 450 |
} |
| 451 |
|
| 452 |
sub glexec_to_nagios($$$) { |
| 453 |
my $rc=shift; |
| 454 |
my $signo=shift; |
| 455 |
my $dt=shift; |
| 456 |
|
| 457 |
if ($rc==0) { |
| 458 |
nagstat->set_perfdata("${dt}s;$warning;$critical;0"); |
| 459 |
if ($dt>=$warning) { |
| 460 |
nagstat->set_status(1,"gLExec took long time to succeed"); |
| 461 |
return 0; |
| 462 |
} else { |
| 463 |
nagstat->set_status(0,"Success"); |
| 464 |
return 1; |
| 465 |
} |
| 466 |
} elsif ($rc==126) { |
| 467 |
nagstat->set_status(1,"executable $payload can't be executed ($rc)"); |
| 468 |
} elsif ($rc==201) { |
| 469 |
nagstat->set_status(2,"client error ($rc)"); |
| 470 |
} elsif ($rc==202) { |
| 471 |
nagstat->set_status(2,"system error ($rc)"); |
| 472 |
} elsif ($rc==203) { |
| 473 |
nagstat->set_status(2,"authorization error ($rc)"); |
| 474 |
} elsif ($rc==204) { |
| 475 |
nagstat->set_status(2,"exit code overlap error ($rc)"); |
| 476 |
} elsif ($signo!=0) { |
| 477 |
nagstat->set_status(2,"exit due to signal $signo ($rc)"); |
| 478 |
} else { |
| 479 |
nagstat->set_status(2, |
| 480 |
"executable $payload failed with non-zero exit code ($rc)"); |
| 481 |
} |
| 482 |
return 1; |
| 483 |
} |
| 484 |
|
| 485 |
# Find gLExec command, payload command (when relative), runs it and returns |
| 486 |
# status |
| 487 |
sub run_glexec() { |
| 488 |
my $glexec; |
| 489 |
my $exitcode; |
| 490 |
my $signo; |
| 491 |
my $t1; |
| 492 |
my $t2; |
| 493 |
|
| 494 |
# Make sure to have starttime |
| 495 |
$t1=time(); |
| 496 |
|
| 497 |
# Set alarm before looking for gLExec to prevent NFS timeouts |
| 498 |
alarm($critical); |
| 499 |
|
| 500 |
# Find glexec command |
| 501 |
if (!defined ($glexec=find_glexec)) { |
| 502 |
nagstat->set_status(2,"glexec command not found"); |
| 503 |
return 1; |
| 504 |
} |
| 505 |
|
| 506 |
# Check proxies |
| 507 |
if (!defined $X509_USER_PROXY) { |
| 508 |
nagstat->set_status(3,"\$X509_USER_PROXY is unset."); |
| 509 |
return 1; |
| 510 |
} |
| 511 |
if (! -e $X509_USER_PROXY || ! -s $X509_USER_PROXY) { |
| 512 |
nagstat->set_status(3, |
| 513 |
"\$X509_USER_PROXY does not point to a nonempty file."); |
| 514 |
return 1; |
| 515 |
} |
| 516 |
if (! -e $GLEXEC_CLIENT_CERT || ! -s $GLEXEC_CLIENT_CERT) { |
| 517 |
nagstat->set_status(3, |
| 518 |
"\$GLEXEC_CLIENT_CERT does not point to a nonempty file."); |
| 519 |
return 1; |
| 520 |
} |
| 521 |
|
| 522 |
# Find full path for payload if it's relative |
| 523 |
if ($payload !~ /^\/.*/) { |
| 524 |
(my $name=$payload) =~ s/ .*//; |
| 525 |
my $fullname; |
| 526 |
for my $dir (@PATH) { |
| 527 |
logger->log_func(3,"Looking for ".$name." in ".$dir."\n"); |
| 528 |
$fullname=$dir."/".$name; |
| 529 |
if (-x $fullname) { |
| 530 |
($payload=$payload) =~ s/^$name/$fullname/; |
| 531 |
logger->log_func(2,"Payload set to ".$payload."\n"); |
| 532 |
last; |
| 533 |
} |
| 534 |
} |
| 535 |
} |
| 536 |
|
| 537 |
# Run actual probe in child process |
| 538 |
if (probeipc->run_probe("$glexec $payload",\$exitcode,\$signo)!=0) { |
| 539 |
return 1; |
| 540 |
} |
| 541 |
|
| 542 |
# Probe exited: find exit status |
| 543 |
$t2=time(); |
| 544 |
my $dt=int(($t2-$t1)*1000+0.5)/1000; |
| 545 |
return glexec_to_nagios($exitcode,$signo,$dt); |
| 546 |
} |
| 547 |
|
| 548 |
# Parse commandline options |
| 549 |
getopts(); |
| 550 |
|
| 551 |
# Initialize logger and set loglevel |
| 552 |
logger->new($verbose); |
| 553 |
|
| 554 |
# Initialize objects |
| 555 |
nagstat->new(); |
| 556 |
|
| 557 |
# Initialize signal handling |
| 558 |
probeipc->new(\&nagios_exit,$timeout,$critical); |
| 559 |
|
| 560 |
# run actual gLExec probe |
| 561 |
run_glexec(); |
| 562 |
|
| 563 |
# Dump nagios status, log and exit |
| 564 |
nagios_exit(); |
| 565 |
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