NASLite Network Attached Storage

#!/bin/sh
# ------------------------------------------------------------------------------
# Simple script to report Disk-# status on NASLite server.
# Extracts the useful info from NASLite's "storage.htm" file.
# Not too intelligent ... does not check for errors or #disks, etc.
# Tested with "NASLite-2 USB v2.06 08-2007"  ... No implied warranties.  AS-IS ...
# ------------------------------------------------------------------------------
#
NL_IP="192.168.1.xxx"      # Use *YOUR* NASLite server IP address here.
NL_Data_Folder="/usr/tmp"   # Use *YOUR* prefered location for temp files.
#
#
# ------------------------------------------------------------------------------
# Get the HTM file into local folder. The "wget" may require ftp services ??
# ------------------------------------------------------------------------------
cd $NL_Data_Folder
rm -f storage.htm                2> /dev/null
wget http://$NL_IP/Status/htm/storage.htm      2> /dev/null

# ------------------------------------------------------------------------------
# Figure out how many disks are listed ... and set NumDisks.
# Assumption: There's one "Disk-" line for each disk.
# ------------------------------------------------------------------------------
NumDisks=`cat storage.htm | grep -i "Disk-" | wc -l`

# ------------------------------------------------------------------------------
# Create a table header, extract "Last update" info, extract NumDisks info.
# Assumption: There's one "TEMP" line for each disk.
# ------------------------------------------------------------------------------
echo -n " Disk#   Size    Used    Free   "       >  disks1.txt
cat storage.htm | grep -i update | cut -d. -f3       >> disks1.txt
cat storage.htm | grep -i temp   | tail -$NumDisks    >> disks1.txt


# ------------------------------------------------------------------------------
# Get rid of most of the html code; then clean up some left-over special
# html formatting.  **NOTE** very specific to the html code implemented
# in whatever current NL version.
# ------------------------------------------------------------------------------
sed -e 's/<[^>]*>//g'             disks1.txt > disks2.txt
sed -e 's/\&nbsp;/ /g'             disks2.txt > disks3.txt
sed -e 's/CUSED/C  Used/g'          disks3.txt > disks4.txt
sed -e 's/READ ONLY /\t/g'          disks4.txt > disks5.txt
sed -e 's/READ\/WRITE /\t/g'          disks5.txt > disks6.txt
sed -e 's/\&#176;/ /g'             disks6.txt > disks7.txt

# ------------------------------------------------------------------------------
# Convert UNIX EOL char. to DOS equivalent, and save somewhere as extra copy.
# ------------------------------------------------------------------------------
sed 's/$/\r/' disks7.txt       > /home/shared/NL_DisksStatus.txt
cat disks7.txt             > NL_DisksStatus.txt

# ------------------------------------------------------------------------------
# Display results.
# ------------------------------------------------------------------------------
more NL_DisksStatus.txt

#!/bin/sh
# ------------------------------------------------------------------------------
# NASLite Disk Monitor: A script to report Disk-# status on NASLite server.
# Extracts the useful info from NASLite's "storage.htm" file.
# Semi-intelligent ... but not all possible conditions fully tested (for
# example: S.M.A.R.T. turned off or unavailable, or Update turned off, etc).
# Also, if temporary files exist, and this script is run with different
# users permission problems may prevent a clean "rm" of old files.
# Can send WARNING EMAIL if temperature threshhold is reached/exceeded.
# But ***NOTE*** that "sendmail" is **TURNED OFF** by default.
# Remaining known issue: if local & NL time are not sync'ed.
# Refer to more documentation at end of this script.
# ------------------------------------------------------------------------------
# By Georg for NASLite Forum Community; tested on "NASLite-2 USB v2.06 08-2007"
# ------------------------------------------------------------------------------
# Version Info/Change History:
# 0.1 never released.
# 1.0 released 20Sep2008 (still did not contain this version info block)
#   Added automatic determination of NumDisks.
# 1.1 released 22Sep2008 Added Section lettering.  Added Section E: "Figure
#   out interval" and continous While/Do Loop (Section F+);  The
#   reports in the loop are placed in a cumulative "LOG".
#   Added "sendmail" capability.
# 1.2 released 29Sep2008 Added "$CatNap" (more real-time) Section E.1.
#   Fixed bug in Section F & adjust Section K (case of TEMP is DISABLED).
#   Fixed problem if NL server is not running (!) (Section C.1).
# ------------------------------------------------------------------------------
Version="1.2"
# ------------------------------------------------------------------------------
# SECTION A: User MUST ADJUST VARIABLES in this section, especially first 4.
# ------------------------------------------------------------------------------
NL_IP="192.168.1.XXX"      # Use *YOUR* NASLite server IP address here.
TEMP_WARN=38         # Your DISK TEMP THRESHOLD WARNING LEVEL.
Recipient="xxx@yyy.zzz"    # Use *YOUR* email address.
NL_LOG="/home/shared/NL_"   # Use *YOUR* prefered LOG FILE name/location.

NL_Data_Folder="/usr/tmp"   # Use *YOUR* prefered location for temp files.


# ------------------------------------------------------------------------------
# SECTION B: Below are additional variables/parameters.
# ------------------------------------------------------------------------------
NL_LOG=$NL_LOG`date +%Y%m%d%H%M`".log"   # Append time-stamp & LOG extension.
HDINFO="storage.htm"
Report="NL_DisksStatus.txt"
WarnMail="MailWarning.txt"
WARN_MSG1="******* WARNING *******"
WARN_MSG2=" AT or EXCEEDING THRESHOLD of $TEMP_WARN"
Title="----- NASLite Disk Monitor version $Version. ------ IP=$NL_IP"
ERR_MSG1="Unable to retrieve HTML from NL Server."
ERR_MSG2="$0 terminated ... "

# ------------------------------------------------------------------------------
# SECTION C: Get HTM file into local folder. "wget" may require ftp services ??
# Version 1.2: Added file cleanup -- permission problems if run from different
# user accounts.
# ------------------------------------------------------------------------------
rm -f disks?.txt $Report $WarnMail         2> /dev/null
cd $NL_Data_Folder
rm -f $HDINFO                   2> /dev/null
wget http://$NL_IP/Status/htm/$HDINFO         2> /dev/null

# ------------------------------------------------------------------------------
# SECTION C.1: Make sure wget is successful.
# ------------------------------------------------------------------------------
echo $Title | sed 's/$/\r/'             >  $NL_LOG
if [ ! -f $HDINFO ] ; then
   echo $ERR_MSG1                >> $NL_LOG
   echo $ERR_MSG2                >> $NL_LOG
   echo $ERR_MSG1
   echo $ERR_MSG2
   exit 1 ;
fi

# ------------------------------------------------------------------------------
# SECTION D: Figure out how many disks are listed ... and set NumDisks.
# Assumption: There's one "Disk-" line for each disk.
# ------------------------------------------------------------------------------
NumDisks=`cat $HDINFO | grep -i "Disk-" | wc -l`

# ------------------------------------------------------------------------------
# SECTION E: Figure out interval.
# Possibilities: 01, 05, 10, 15, 30, 45, 1h, 4h, 8h, --
# So far only tested 15 & 5 minute & 1h intervals ...
# ------------------------------------------------------------------------------
#
UpdateMSG=`cat $HDINFO | grep -i "Content updated every"`
Interval=`echo $UpdateMSG | sed -e 's/<[^>]*>//g' | cut "-d " -f7`
Units=`echo $UpdateMSG | sed -e 's/<[^>]*>//g' | cut "-d " -f8 | cut -d. -f1`
echo -n "Update Interval is" $Interval $Units
if [ $Units == "min" ] ; then
   Mult=60 ;
else
   Mult=3600 ;
fi
Rest=`/usr/bin/expr  $Mult \* $Interval `
echo "  == Sleep Time of" $Rest "seconds."

# ------------------------------------------------------------------------------
# SECTION E.1: For first $Rest SLEEP, reduce to $CatNap.
# Reason: If Update $Interval is very long, and the program was started close
# to the NEXT update, then a large amount of SLEEP is wasted until the
# actual delayed reporting for that soon-to-occur update with its second set
# of data.  Calculate the shortened time to next update+2mins as $CatNap.
# Problem = if this system & NASLite system are not synchronized !!!
# ------------------------------------------------------------------------------
#
LastUpdat=`cat $HDINFO | grep -i "Last update" | cut -d. -f3`
TLastStr=`echo $LastUpdat | sed -e 's/<[^>]*>//g' | cut -c12-`

TLast=`date -u --date="$TLastStr" +%s`   # Secs since 1970 (%s option).
TNow=`date -u +%s`         # Secs since 1970 (%s option).
Tdiff=`expr $TNow \- $TLast`      # Secs since last update.
T2Next=`expr $Rest \- $Tdiff`      # Secs to NEXT update.
CatNap=`expr $T2Next \+ 120`      # Will never be ZERO ... use it once!
echo "First time take shorter CatNap of $CatNap (instead of $Rest) seconds."


# ------------------------------------------------------------------------------
# ******************************************************************************
# MAIN LOOP: Run continously ... report each $Interval.  Email if Alarm.
# ******************************************************************************
# ------------------------------------------------------------------------------
while [ "1" == "1" ] ; do

# ------------------------------------------------------------------------------
# SECTION F: Create a table header, extract "Last update" and NumDisks info.
# Assumption: There's one "TEMP" line for each disk.
# Bug or Problem: if S.M.A.R.T. is UNAVAILABLE or DISABLED.
# ------------------------------------------------------------------------------
NumTemps=`cat $HDINFO | grep -i temp | wc -l`
echo -n " Disk#   Size    Used    Free   "       >  disks1.txt
cat $HDINFO | grep -i update | cut -d. -f3       >> disks1.txt
#BUG: ##cat storage.htm | grep -i temp   | tail -$NumDisks    >> disks1.txt
cat $HDINFO | grep -i "Disk-"  | tail -$NumDisks    >> disks1.txt

# ------------------------------------------------------------------------------
# SECTION G: Remove bulk of the html code; then clean up some left-over special
# html formatting.  **NOTE** very specific to the html code implemented
# in whatever current NL version.  If more commands needed, continue incementing
# '#' in "disks#.txt", then in next section copy final txt file to $Report.
# ------------------------------------------------------------------------------
sed -e 's/<[^>]*>//g'             disks1.txt > disks2.txt
sed -e 's/\&nbsp;/ /g'             disks2.txt > disks3.txt
sed -e 's/CUSED/C  Used/g'          disks3.txt > disks4.txt
sed -e 's/READ ONLY /\t/g'          disks4.txt > disks5.txt
sed -e 's/READ\/WRITE /\t/g'          disks5.txt > disks6.txt
sed -e 's/\&#176;/ /g'             disks6.txt > disks7.txt

# ------------------------------------------------------------------------------
# SECTION H: Copy final txt file to $Report (for later ease of use).
# Convert UNIX EOL char. to DOS equivalent.
# Append current status report to cumulative NL_LOG file.
# ------------------------------------------------------------------------------
cat disks7.txt             >  $Report
sed 's/$/\r/' $Report          >> $NL_LOG

# ------------------------------------------------------------------------------
# SECTION I: Display $Report.
# ------------------------------------------------------------------------------
echo "Local time is" `date`
cat $Report

# ------------------------------------------------------------------------------
# Now lets put some REAL INTELLIGENCE here ... TEMPs are known, could, for
# example, send email in case a THRESH-HOLD TEMP is EXCEEDED ...
# ------------------------------------------------------------------------------
# SECTION J: First, extract TEMPS into a single word list.
# ------------------------------------------------------------------------------
Result=`sed 's/ [ ]*/ /g' $Report | cut "-d " -f 2,7 | tail -$NumDisks`

# ------------------------------------------------------------------------------
# SECTION K: Now scan the list of results (word-pairs DiskName/TEMP).
# ------------------------------------------------------------------------------
Alarm=0               # RESET TEMPerature Alarm to OFF.
toggle=0
for WORD in $Result ; do
   toggle=`expr 1 - $toggle`   # Toggle flag so that words in
   if [ $toggle -eq 1 ] ; then    # $Result can be handled in pairs.
      DISK=$WORD      # Get DiskName (=1st) field in $Result.
      continue ;      # Skip to second field.
   else
      TEMP=$WORD      # Get TEMP (=2nd) field in $Result.

      # Ensure that $TEMP is numeric (NOT Alpha as in "DISABLED")
      # before testing its numeric value against threshhold.
      Alpha=`echo $TEMP | sed 's/[0-9]//g'`
      if [ -z $Alpha ] ; then
      if [ $TEMP -ge $TEMP_WARN ] ; then
         echo "$WARN_MSG1" $DISK at $TEMP "$WARN_MSG2"
         echo -n "$WARN_MSG1" $DISK at $TEMP    >> $NL_LOG
         echo "$WARN_MSG2" | sed 's/$/\r/'    >> $NL_LOG
         Alarm=1      # Trigger the Alarm.
         ListEnd=1 ;
      else
         ###echo $DISK is at $TEMP degrees C
         ListEnd=1 ;
      fi
      ListEnd=1 ;
      fi
   ListEnd=1 ;
   fi
   ListEnd=1 ;
done

# ------------------------------------------------------------------------------
# SECTION L: Send WARNING EMAIL ...
# (Obviously requires a "sendmail" mail server running on local system.)
# ------------------------------------------------------------------------------
if [ $Alarm -eq 1 ] ; then
   domain=`echo $Recipient | cut -d@ -f2`
   echo "Date: `date`"              >> MailMsg
   echo "From: no-reply@$domain"          >  MailMsg
   echo "Subject: NL TEMP WARNING"       >> MailMsg
   echo "To: $Recipient"             >> MailMsg
   echo ''                >> MailMsg
   echo -n "$WARN_MSG1"            >> MailMsg
   echo At least one disk "$WARN_MSG2"      >> MailMsg
   echo ''                >> MailMsg
   echo "----------- Full Report is ------------"   >> MailMsg
   cat $Report               >> MailMsg

   sed 's/$/\r/' MailMsg             >  $WarnMail

   # ----------------------------------------------------------------------
   # NOTE: Actual emailing is currently ***DISABLED***
   # EN-ABLE 'sendmail' by REMOVING the '#' in front of it.
   # Using "-f" so "Return-Path" won't be "root" or other unusual user.
   # ----------------------------------------------------------------------
   rm -f MailMsg 2> /dev/null
   ###/usr/sbin/sendmail -fDoNotReply -t       <  $WarnMail
   ListEnd=1 ;
fi

# ------------------------------------------------------------------------------
# SECTION M: SLEEP until next Interval; then grab updated HTM, and loop around.
# Updated after Section E.1 was added with $CatNap.
# ------------------------------------------------------------------------------
rm -f $HDINFO                2> /dev/null
if [ $CatNap -gt 0 ] ; then
   sleep $CatNap
   CatNap=0          # Reset so it's used only once.
   ListEnd=1 ;
else
   sleep $Rest
   ListEnd=1 ;
fi
wget http://$NL_IP/Status/htm/$HDINFO      2> /dev/null

ListEnd=1 ;
# ------------------------------------------------------------------------------
done      # END of continuous WHILE LOOP
# ------------------------------------------------------------------------------

exit 0   # Clean non-error exit if this point is reached.


# ------------------------------------------------------------------------------
# Regarding "SENDMAIL":
# This script uses "sendmail" at bottom of Section L.  Obviously the CPU this
# script runs on must contain a properly set up mechanism for sending mail.
# For most users this may have already been arranged, but if not, is not a
# trivial excercise.  In particular Section L assumes that (for example) the
# user running this script (may be 'root' because the script is part of the
# startup sequence) is not necessarily properly authenticated, and since
# an ISP may require that mail headers match a certain domain the "Return-Path"
# is set to the domain of the recipient ... etc etc.  The file "main.cf" in
# "/etc/postfix" may also require adjustments.
#
# I have been testing this script using the "root" login on a server running
# Linux.  The server does not run an email program ... email is done at
# the WinXP clients, and therefore user accounts on the server do NOT correlate
# to ISP account (and their email addresses).  For testing I temporarily set
# up SMTP on the server.
#
# So ... the general comments is **** USER BEWARE ***.  For "sendmail" to
# properly work the user may have to do his/her own investigation. 
# ------------------------------------------------------------------------------
# Regarding "ListEnd=1 ;"
# I don't like how "/bin/sh" uses the ";" to terminate the "list" of commands
# to execute in an "if" or "while" statement.  I use a (dummy) separate line
# to designate a more obvious last statement for the section in question.
# Non-standard -- I know -- apologies to hot-shot programmers (which I am not).
# ------------------------------------------------------------------------------
# Can add a line to "/etc/rc.local" to start this script on boot.  However,
# a couple of things to watch: 1] make sure to start it with a "/bin/sh" shell,
# and 2] route 1> and 2> to some specific desired location , and 3] use "&". 
# Here's an example: (where xxx is name you give this script, "NL_HD_Stat.sh")
# /bin/sh ~/bin/xxx 1> /usr/temp/xxx_out.txt 2> /usr/temp/xxx_err.txt &
# ------------------------------------------------------------------------------
# Other "to-do":
# Consider allowing command line options to designate the $Recipient,
# the loop count, the $TEMP_WARN threshhold, etc.
# Fix problem of de-synced clocks of NL & this system running script (de-sync
# messes up the SLEEP/CatNap intervals), which can waste a lot of time between
# current TEMPs and last status if the Update interval is long.
# Fix "permission denied" errors if temp files exist and can not be removed
# by the user currently running the script.
# Add general clean ERROR control (ON ERROR perform some action).
# ------------------------------------------------------------------------------

$ NL
Update Interval is 15 min  == Sleep Time of 900 seconds.
First time take shorter CatNap of 503 (instead of 900) seconds.
Local time is Mon Sep 29 10:38:38 PDT 2008
 Disk#   Size    Used    Free   Last update Mon Sep 29 17:30:01 UTC 2008
 Disk-0  183.4G  123.9G  59.5G          TEMP 35 C  Used 68% (95%)
 Disk-1  275.1G  246.0G  29.1G          TEMP 34 C  Used 89% (95%)
 Disk-2  458.4G  419.8G  38.6G          TEMP 31 C  Used 92% (95%)

$ NL
Update Interval is 15 min  == Sleep Time of 900 seconds.
First time take shorter CatNap of 211 (instead of 900) seconds.
Local time is Mon Sep 29 10:43:30 PDT 2008
 Disk#   Size    Used    Free   Last update Mon Sep 29 17:30:01 UTC 2008
 Disk-0  183.4G  123.9G  59.5G          TEMP 35 C  Used 68% (95%)
 Disk-1  275.1G  246.0G  29.1G          TEMP 34 C  Used 89% (95%)
 Disk-2  458.4G  419.8G  38.6G          TEMP 31 C  Used 92% (95%)
******* WARNING ******* Disk-0 at 35  AT or EXCEEDING THRESHOLD of 35