Create a filter for Check_EventLog

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vmesquita
Posts: 315
Joined: Fri Aug 10, 2012 12:52 pm

Create a filter for Check_EventLog

Post by vmesquita »

I am trying to filter Windows Events from a specific source by doing:

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./check_nrpe -H SERVERNAME -c Check_EventLog -a file=system filter="source=TESTENAGIOS"
(Real name of the server was replaced by SERVERNAME.

However I get this response:

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Failed to validate filter see log for details
nsclient.log shows:

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2019-04-10 16:07:08: error:c:\source\nscp\modules\NRPEServer\NRPEServer.cpp:185: Request arguments contained illegal metachars!
I tried a few variations but I can't get to the correct syntax. Can you help me?
npolovenko
Support Tech
Posts: 3457
Joined: Mon May 15, 2017 5:00 pm

Re: Create a filter for Check_EventLog

Post by npolovenko »

Hello, @vmesquita. Can you try the following syntax instead?
./check_nrpe -H SERVERNAME -c check_eventlog -a file=system "filter=(source='TESTENAGIOS')"
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vmesquita
Posts: 315
Joined: Fri Aug 10, 2012 12:52 pm

Re: Create a filter for Check_EventLog

Post by vmesquita »

npolovenko wrote:Hello, @vmesquita. Can you try the following syntax instead?
./check_nrpe -H SERVERNAME -c check_eventlog -a file=system "filter=(source='TESTENAGIOS')"
I got this result:

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./check_nrpe -H SERVERNAME -c check_eventlog -a file=system "filter=(source='TESTENAGIOS')"
Exception processing request: Request command contained illegal metachars!
npolovenko
Support Tech
Posts: 3457
Joined: Mon May 15, 2017 5:00 pm

Re: Create a filter for Check_EventLog

Post by npolovenko »

@vmesquita, This command works for me.
Untitled.png
What version of the NSClient do you have installed?
Can you upload the nsclient.ini file?
Are you searching for TESTENAGIOS or is it some other expression that contains special characters?
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vmesquita
Posts: 315
Joined: Fri Aug 10, 2012 12:52 pm

Re: Create a filter for Check_EventLog

Post by vmesquita »

npolovenko wrote: What version of the NSClient do you have installed?
The latest release labeled as stable:

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# ./check_nrpe -H SERVERNAME
I (0.4.4.23 2016-04-05) seem to be doing fine...
Can you upload the nsclient.ini file?

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# If you want to fill this file with all avalible options run the following command:
#   nscp settings --generate --add-defaults --load-all
# If you want to activate a module and bring in all its options use:
#   nscp settings --activate-module <MODULE NAME> --add-defaults
# For details run: nscp settings --help


; Undocumented section
[/modules]

; CheckDisk - CheckDisk can check various file and disk related things. The current version has commands to check Size of hard drives and directories.
CheckDisk = 1

; Event log Checker. - Check for errors and warnings in the event log. This is only supported through NRPE so if you plan to use only NSClient this wont help you at all.
CheckEventLog = 1

; Check External Scripts - A simple wrapper to run external scripts and batch files.
CheckExternalScripts = 1

; Helper function - Various helper function to extend other checks. This is also only supported through NRPE.
CheckHelpers = 1

; Check NSCP - Checkes the state of the agent
CheckNSCP = 1

; CheckSystem - Various system related checks, such as CPU load, process state, service state memory usage and PDH counters.
CheckSystem = 1

; CheckWMI - CheckWMI can check various file and disk related things. The current version has commands to check Size of hard drives and directories.
CheckWMI = 1

; NRPE server - A simple server that listens for incoming NRPE connection and handles them.
NRPEServer = 1

; NSClient server - A simple server that listens for incoming NSClient (check_nt) connection and handles them. Although NRPE is the preferred method NSClient is fully supported and can be used for simplicity or for compatibility.
NSClientServer = 1


; Undocumented section
[/settings/default]

; ALLOWED HOSTS - A comaseparated list of allowed hosts. You can use netmasks (/ syntax) or * to create ranges.
allowed hosts = nagios.selic.bc,nagioshml.selic.bc,172.27.36.37,172.27.5.37

; PASSWORD - Password used to authenticate againast server
password = <<<<password>>>>

[/settings/NRPE/server]
allow arguments = 1
insecure = true  

; A list of aliases available. An alias is an internal command that has been "wrapped" (to add arguments). Be careful so you don't create loops (ie check_loop=check_a, check_a=check_loop)
[/settings/external scripts/alias]

; alias_cpu - Alias for alias_cpu. To configure this item add a section called: /settings/external scripts/alias/alias_cpu
alias_cpu = checkCPU warn=80 crit=90 time=5m time=1m time=30s

; alias_cpu_ex - Alias for alias_cpu_ex. To configure this item add a section called: /settings/external scripts/alias/alias_cpu_ex
alias_cpu_ex = checkCPU warn=$ARG1$ crit=$ARG2$ time=5m time=1m time=30s

; alias_disk - Alias for alias_disk. To configure this item add a section called: /settings/external scripts/alias/alias_disk
alias_disk = CheckDriveSize MinWarn=10% MinCrit=5% CheckAll FilterType=FIXED

; alias_disk_loose - Alias for alias_disk_loose. To configure this item add a section called: /settings/external scripts/alias/alias_disk_loose
alias_disk_loose = CheckDriveSize MinWarn=10% MinCrit=5% CheckAll FilterType=FIXED ignore-unreadable

; alias_event_log - Alias for alias_event_log. To configure this item add a section called: /settings/external scripts/alias/alias_event_log
alias_event_log = CheckEventLog file=application file=system MaxWarn=1 MaxCrit=1 "filter=generated gt -2d AND severity NOT IN ('success', 'informational') AND source != 'SideBySide'" truncate=800 unique descriptions "syntax=%severity%: %source%: %message% (%count%)"

; alias_file_age - Alias for alias_file_age. To configure this item add a section called: /settings/external scripts/alias/alias_file_age
alias_file_age = checkFile2 filter=out "file=$ARG1$" filter-written=>1d MaxWarn=1 MaxCrit=1 "syntax=%filename% %write%"

; alias_file_size - Alias for alias_file_size. To configure this item add a section called: /settings/external scripts/alias/alias_file_size
alias_file_size = CheckFiles "filter=size > $ARG2$" "path=$ARG1$" MaxWarn=1 MaxCrit=1 "syntax=%filename% %size%" max-dir-depth=10

; alias_mem - Alias for alias_mem. To configure this item add a section called: /settings/external scripts/alias/alias_mem
alias_mem = checkMem MaxWarn=80% MaxCrit=90% ShowAll=long type=physical type=virtual type=paged type=page

; alias_process - Alias for alias_process. To configure this item add a section called: /settings/external scripts/alias/alias_process
alias_process = checkProcState "$ARG1$=started"

; alias_process_count - Alias for alias_process_count. To configure this item add a section called: /settings/external scripts/alias/alias_process_count
alias_process_count = checkProcState MaxWarnCount=$ARG2$ MaxCritCount=$ARG3$ "$ARG1$=started"

; alias_process_hung - Alias for alias_process_hung. To configure this item add a section called: /settings/external scripts/alias/alias_process_hung
alias_process_hung = checkProcState MaxWarnCount=1 MaxCritCount=1 "$ARG1$=hung"

; alias_process_stopped - Alias for alias_process_stopped. To configure this item add a section called: /settings/external scripts/alias/alias_process_stopped
alias_process_stopped = checkProcState "$ARG1$=stopped"

; alias_sched_all - Alias for alias_sched_all. To configure this item add a section called: /settings/external scripts/alias/alias_sched_all
alias_sched_all = CheckTaskSched "filter=exit_code ne 0" "syntax=%title%: %exit_code%" warn=>0

; alias_sched_long - Alias for alias_sched_long. To configure this item add a section called: /settings/external scripts/alias/alias_sched_long
alias_sched_long = CheckTaskSched "filter=status = 'running' AND most_recent_run_time < -$ARG1$" "syntax=%title% (%most_recent_run_time%)" warn=>0

; alias_sched_task - Alias for alias_sched_task. To configure this item add a section called: /settings/external scripts/alias/alias_sched_task
alias_sched_task = CheckTaskSched "filter=title eq '$ARG1$' AND exit_code ne 0" "syntax=%title% (%most_recent_run_time%)" warn=>0

; alias_service - Alias for alias_service. To configure this item add a section called: /settings/external scripts/alias/alias_service
alias_service = checkServiceState CheckAll

; alias_service_ex - Alias for alias_service_ex. To configure this item add a section called: /settings/external scripts/alias/alias_service_ex
alias_service_ex = checkServiceState CheckAll "exclude=Net Driver HPZ12" "exclude=Pml Driver HPZ12" exclude=stisvc

; alias_up - Alias for alias_up. To configure this item add a section called: /settings/external scripts/alias/alias_up
alias_up = checkUpTime MinWarn=1d MinWarn=1h

; alias_updates - Alias for alias_updates. To configure this item add a section called: /settings/external scripts/alias/alias_updates
alias_updates = check_updates -warning 0 -critical 0

; alias_volumes - Alias for alias_volumes. To configure this item add a section called: /settings/external scripts/alias/alias_volumes
alias_volumes = CheckDriveSize MinWarn=10% MinCrit=5% CheckAll=volumes FilterType=FIXED

; alias_volumes_loose - Alias for alias_volumes_loose. To configure this item add a section called: /settings/external scripts/alias/alias_volumes_loose
alias_volumes_loose = CheckDriveSize MinWarn=10% MinCrit=5% CheckAll=volumes FilterType=FIXED ignore-unreadable 

; default - Alias for default. To configure this item add a section called: /settings/external scripts/alias/default
default = 
Are you searching for TESTENAGIOS or is it some other expression that contains special characters?
I am searching for TESTENAGIOS, I created a custom event to test it:

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C:\Users\a-vmesquita>eventcreate /ID 1 /L system /T ERROR /SO TESTENAGIOS /D "My
 first log"

SUCCESS: An event of type 'ERROR' was created in the 'system' log with 'TESTENAG
IOS' as the source.
npolovenko
Support Tech
Posts: 3457
Joined: Mon May 15, 2017 5:00 pm

Re: Create a filter for Check_EventLog

Post by npolovenko »

@vmesquita, Please replace your nsclient.ini file with the one I attached to this message. Open the nsclient.ini file and change <<<<password>>>> to the actual password. Then restart the nsclient service from the windows services menu.
Run the command and let me know if it works.
./check_nrpe -H SERVERNAME -c check_eventlog -a file=system "filter=(source='TESTENAGIOS')"
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As of May 25th, 2018, all communications with Nagios Enterprises and its employees are covered under our new Privacy Policy.
vmesquita
Posts: 315
Joined: Fri Aug 10, 2012 12:52 pm

Re: Create a filter for Check_EventLog

Post by vmesquita »

npolovenko wrote:@vmesquita, Please replace your nsclient.ini file with the one I attached to this message. Open the nsclient.ini file and change <<<<password>>>> to the actual password. Then restart the nsclient service from the windows services menu.
Run the command and let me know if it works.
./check_nrpe -H SERVERNAME -c check_eventlog -a file=system "filter=(source='TESTENAGIOS')"
Now it worked! I did an extra test, modified the old file adding only the key:

allow nasty characters = 1

And it also worked. So apparently this is required for some reason.
npolovenko
Support Tech
Posts: 3457
Joined: Mon May 15, 2017 5:00 pm

Re: Create a filter for Check_EventLog

Post by npolovenko »

@vmesquita, Glad we finally got it to work! Would you have any other questions before I close the thread as resolved?
As of May 25th, 2018, all communications with Nagios Enterprises and its employees are covered under our new Privacy Policy.
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