check_smb_share

#!/bin/bash

# Check for sharename on SMB with nagios
# by Gerrit Doornenbal (g.doornenbal@gmail.com) 
#
# 2017-12-27
#  added smb.conf option to disable spnego(iation) for some old samba servers.
#
# 2017-02-24
#  fixed login problem for MS servers
#  added option to check inside directories
#  added option to check for number of existing files
#  changed filecheck option to search using wildcards
#  added option to check upon file age, older than .. seconds.
#  added option to store login credentials inside a file.
#  
# 2011-11-23
#  added file check option, to check if share is really available
# Modified version of check_smb_share byMichael Hodges <michael@va.com.au> 2011-03-04
# Modified version of check_smb by Dave Love <fx@gnu.org>

REVISION=1.1
PROGNAME=`/usr/bin/basename $0`
PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

help () {
    echo "\
Nagios plugin to check SMB Share.

Usage:
  $PROGNAME -H <host> -s <sharename> [-d <dirname>] [-f <filename>] [-u <user>] [-p <password>] [-n] [-v] [-h --help] [-V --version]
     -H hostname of the SMB host
     -s sharename to look for
     -f file- or directoryname to look for. You can use partial filenames, do not give a * (wildcard).
     -d directory name to look for files or directory
     -u username used to login. if no username is supplied, 'guest' wil be used.
        for domain login use -u <domainname>/<username>
     -o disable spnego(tiaton).
     -p password for the username supplied.
     -l Logincredential file location. Format of file is:
          username=<DOMAIN>/<username>
          password=<password> (escape special characters with a \)
     -n number of files expected. Default is 1 or more. 
	 -a age of file in seconds. When you're checking file's which should be away in specified time, you can set max age here.
     -v Verbose output, comes handy when troubleshooting errors with smbclient.
     --help this help message
	 
examples:
  $PROGNAME -H server.domain.com -s yourshare
      Check for the existence of 'yourshare' on server.domain.com.
  $PROGNAME -H server.domain.com -s yourshare -u DOMAIN/user -p yourpassword -f testfile.txt
      This line looks for *testfile.txt files in \server.domain.com\yourshare, and gives OK when it exist.
  $PROGNAME -H server.domain.com -s yourshare -l /path/to/pwfile -f .xml -d yourdir -n 0
      This line looks for *.xml files in \server.domain.com\yourshare\yourdir, and gives OK when none exist.
"
}

if [ $# -lt 1 ]; then
    help
    exit $STATE_UNKNOWN
fi

user="guest"
password=""
nospnego=""

# Read all command-line options
while test -n "$1"; do
    case "$1" in
	--help | -h)
	    help
	    exit $STATE_OK;;
	--version | -V)
	    echo $PROGNAME $REVISION
	    exit $STATE_OK;;
	-H)
	    shift
	    host="$1";;
	-s)
	    shift
	    share="$1";;
	-d)
	    shift
	    dir="$1";;
	-f)
	    shift
	    file="$1";;
	-n)
	    shift
	    count="$1";;
	-a)
	    shift
	    age="$1";;
	-u)
	    shift
	    user="$1";;
	-p)
	    shift
	    password="$1";;
	-l)
	    shift
	    pwfile="$1";;
	-v)
		verbose=1;;
	-o) 
		nospnego=" --option=clientusespnego=no";;
	*)
	    help; exit $STATE_UNKNOWN;;
    esac
shift
done

if [ ! $share ]; then
    help
    exit $STATE_UNKNOWN
fi

if [ $pwfile ]; then
    source $pwfile
	if [ $verbose ]; then
		echo pwfile: username: $user pass: $password
	fi 
fi


#First test for share existence.
if [ ! $password ]; then
	login="$user% -N"
else 
	login="$user%$password"
fi
command="smbclient -U $login -L $host$nospnego"
result=`$command 2>&1`
if [ $verbose ]; then
	echo command: $command
	echo result : $result
	echo
fi

stdout="SMB share found: "`echo "$result" | grep "$share" | head -n 1 | { read first _ ; echo $first ; }`
errout="SMB Sharename "$share" NOT found on "$host
testresult=`echo "$stdout" | grep "$share" | wc -l`

#check to test file on share
if [ $file ]; then
	if [ $dir ]; then
		dircheck="-D $dir "
		dirshare="\\"$dir
	fi
	command="smbclient -U "$user"%"$password"$nospnego //"$host"/"$share" "$dircheck"-c \"ls *"$file"*\""
	result=`$command 2>&1`
	testresult=`echo "$result" | grep "$file" | wc -l `
	#check timestamp age
	resulttime=`echo "$result" | grep "$file" | head -n 1 | tr -s " " | cut -d " " -f 5-9`
	filetime=`date --date="$resulttime" +%s`
	time=`date +%s`	
	fileage=$((time-filetime))
	
	if [ $verbose ]; then
		echo command: $command
		echo result : $result
		echo Current time: $time Filetime: $filetime Fileage: $fileage $age
	fi
	
	#Do the test for number of files.
	if [ $count ]; then 
		if [ $count -eq $testresult ]; then
			stdout="SMB file "$file" found "$testresult" times on "$share$dirshare
			testresult=1
		else 
			if [ $age ]; then 
				if [ $age -gt $fileage ]; then
				stdout="SMB file "$file" found ($fileage sec old) on "$share$dirshare
				testresult=1
				else
				errout="SMB file "$file" found ($fileage sec old) on "$share$dirshare
				testresult=0
				fi
				
			else 
				errout="SMB file "$file" found "$testresult" times on "$share$dirshare
				testresult=0
			fi
		fi
	else 
	#Do the test for existence of the file
		if [ $testresult -gt 1 ]; then
			stdout="SMB file "$file" found "$testresult" times on "$share$dirshare
		else 
			stdout="SMB file "$file" found on "$share$dirshare
		fi
		errout="SMB file "$file" NOT found on "$share$dirshare
	fi
fi 

if [ $testresult != 0 ]; then
    echo "OK "$stdout
    exit $STATE_OK
else
    echo "CRITICAL "$errout
    exit $STATE_CRITICAL
fi