Nagios 4.4.10 Notification Command returns stderr line 01: /bin/sh: 1: Syntax error: redirection unexpected

[k34185]

I have created a new Python 3.10 script that takes notification arguments and triggers an email and at the same time forwards the notification to another service using and API.

When I try to send a "Custom host notification" to test my notification script I get a

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stderr line 01: /bin/sh: 1: Syntax error: redirection unexpected

and of course the notification is not sent and my script is not executed. I have tried to redirect stdout to a file and stderr to stdout, and it still is not working.

Any idea what may be wrong. Looks like nagios is trying to start /bin/sh and launch the command. The path of Python is correct so as the path to the Python script. I'm starting to believe that it could be the quotes I'm using to wrap each parameter.

/usr/local/nagios/etc/objects/commands.cfg

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...
define command{
        command_name    notify-host-by-email-normal
        command_line    /usr/bin/python3 /usr/local/neo/nagios/notify/notify.py -u "$USER20$" -n "$NOTIFICATIONTYPE$" -d "$HOSTNAME$" -D "$HOSTSTATE$" -i "$HOSTADDRESS$" -o "$HOSTOUTPUT$" -c "$NOTIFICATIONCOMMENT$" -t "$LONGDATETIME$" "$CONTACTEMAIL$" >> /usr/local/neo/nagios/notify/logs/notify.log 2>&1
        }
...

/usr/local/nagios/var/nagios.log

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...
[1725576091] EXTERNAL COMMAND: SEND_CUSTOM_HOST_NOTIFICATION;17KNK9K3CS11;3;Network Engineering NEO;custom 3
[1725576091] HOST NOTIFICATION: monitoring-normal;********;CUSTOM (UP);notify-host-by-email-normal;PING OK - Packet loss = 0%, RTA = 2.42 ms;Network Engineering NEO;custom 3
[1725576091] HOST NOTIFICATION: networke-normal;********;CUSTOM (UP);notify-host-by-email-normal;PING OK - Packet loss = 0%, RTA = 2.42 ms;Network Engineering NEO;custom 3
[1725576091] wproc: NOTIFY job 0 from worker Core Worker 557827 is a non-check helper but exited with return code 2
[1725576091] wproc:   host=********; service=(none); contact=network-normal
[1725576091] wproc:   early_timeout=0; exited_ok=1; wait_status=512; error_code=0;
[1725576091] wproc:   stderr line 01: /bin/sh: 1: Syntax error: redirection unexpected
[1725576091] wproc: NOTIFY job 0 from worker Core Worker 557828 is a non-check helper but exited with return code 2
[1725576091] wproc:   host=********; service=(none); contact=monitoring-normal
[1725576091] wproc:   early_timeout=0; exited_ok=1; wait_status=512; error_code=0;
[1725576091] wproc:   stderr line 01: /bin/sh: 1: Syntax error: redirection unexpected
...

/usr/local/nagios/var/nagios.debug

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...
[1725576091.501592] [256.1] [pid=47302] Read raw external command '[1725576091] SEND_CUSTOM_HOST_NOTIFICATION;********;3;Network Engineering NEO;custom 3'
[1725576091.502759] [032.0] [pid=47302] ** Host Notification Attempt ** Host: '********', Type: CUSTOM, Options: 3, Current State: 0, Last Notification: Thu Jan  1 00:00:00 1970
[1725576091.502918] [032.1] [pid=47302] This is a forced host notification, so we'll send it out.
[1725576091.503030] [032.0] [pid=47302] Notification viability test passed.
[1725576091.503163] [032.1] [pid=47302] Current notification number: 0 (unchanged)
[1725576091.503272] [032.1] [pid=47302] Host notification will NOT be escalated.
[1725576091.503374] [032.1] [pid=47302] This notification will be BROADCAST to all (escalated and normal) contacts...
[1725576091.503490] [032.1] [pid=47302] Adding contacts from host escalation(s) to notification list.
[1725576091.503595] [032.1] [pid=47302] Adding normal contacts for host to notification list.
[1725576091.504688] [032.0] [pid=47302] 2 contacts were notified.
...

[jsimon]

Hi @k34185,

The first thing I would look at is making sure your script opens with "/bin/python" and not "/bin/sh" as you're trying to run a python script, not a shell script.

[k34185]

Thank you for your reply. In the command_line part of the command I have /usr/bin/python3 as the command and my script and all its parameters are part of the arguments for /usr/bin/python3.

I believe I found the issue with my command_line. My $USER20$ variable holds extra HTML code depending on the level of notification and is defined something similar as the following:

/usr/local/nagios/etc/resource.cfg

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...
$USER20$="<dl><dt>Procedure:</dt><ul><li>Please verify the error in <a href=\"https://****/\">Nagios</a>.</li><li>Please check the <a href=\"https://****\">Activity Calendar</a> for scheduled maintenance.</li><li>If the error persists outside a scheduled maintenance window, please call the On-Call Network Engineer at ###-###-#### or email to <a href=\"mailto:****?subject=****\">Support</a>.</li></ul></dl>"
...

I believe here is where Nagios command is finding the redirection unexpected. I think I'll try to escape all the '<', '>', ':' and '/'

[jsimon]

I understand that your command configuration specifies "/usr/bin/python3", however the error message you are getting back states that it occurs on line 1. If Line 1 of your script opens with

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#!/bin/sh

or something like this, that will cause this redirect error. You'll want

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#!/usr/bin/env python

, or whatever the path to your python binary is here. I would recommend taking a look at this in addition to your escape efforts to see if it helps the issue.