Problem running ssh script in nagios

[Charlie R]

Hi List,

Before we start, check_ssh and check_by_ssh is not a workable solution  
for me. I have a special setup in place that needs to run checks over  
native ssh since I have a bunch of ssh config options per host and  
need to use a proxy from where my nagios server is. So far what I have  
found doesn't let me use my ssh config file. My goal is to use ssh to  
check for host uptime since that's available on every host.

I wrote a script that is very very basic. It's job is to ssh to a host  
to determine if it's up or down. Here's the meat and potatoes of that.

--- checkhost.sh ---
#!/bin/bash

# Purpose: Replacement host alive check for nagios
# on hosts that cannot be directly pinged

# Usage function
usage()
{
cat << EOF

usage: checkhost.sh -H <host>

OPTIONS:
	-h	Show this message
	-H	SSH host address
EOF
}

# Variables
SSHPath='/usr/bin/ssh'

# Options menu
while getopts "hH:" OPTION
do
	case $OPTION in
		h)
			usage
			exit 1
			;;
		H)
			SSHHost=$OPTARG
			;;
		?)
			usage
			exit 1
			;;
		esac
	done

# Make sure the required stuff is here
if [[ -z $SSHHost ]]
	then
		usage
		exit 1
	fi

# Connect function
SSHConnect()
{
$SSHPath -q $SSHHost exit
if [[ "$?" -eq 0 ]]
	then
		echo "Host is reachable"
		exit 0
	else
		echo "Unable to reach host"
		exit 2
	fi
}
SSHConnect
--- end script ---

When I run this script on my bash shell, it works perfect. When I run  
this as a host check in nagios, it fails with (Return code of 255 is  
out of bounds).

I've checked to make sure it's not getting prompted to accept the  
local host key.
I've checked nagios.debug to make sure the command is parsing correctly
I've checked ssh key permissions
I've changed my ssh code around to return something no matter what and  
it works.

At this point, I'd like to blame ssh but I'm not 100% sure on that.

Is there any caveats to run SSH on the native system with ssh keys and  
a more than customized ssh config file? Maybe I'm missing a ssh  
option? I've tried with and with out -T and -t. I've specifcally  
specified my config file along with my ssh keys.

Thanks,

Charlie

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