Disclaimer:
This is a neat hack to query modem status and alert admin if found Down. This is no way a standard method to perform this task but I used it as it worked fine for some specific environment. I made this because first , I was unable to find any good solution for this, second, making our customized solution is always far better then ready made tools. because with customization, we can get our desired results by folding/molding and twisting about anything that gets in our way :~)
SCENARIO!
Serial modem is attached to Linux (Ubuntu) system for sending receiving sms via locally installed KANNEL as gateway. Rarely sometimes modem stops responding to sms requests and it require physical power off/on. if system is not very actively monitored by admin, or remote administration is being done, then we require a solution that can alert us by EMAIL if modem stopped working. and when it start working again, send us Email+SMS for the event. But it should not repeatedly send sms/email for same incident.Some checks must be there in order to prevent this.
REQUIREMENTS!
1- Make sure you have WVDIALCONF utility before executing this script. you can install wvidalconf in UBUNTU by following command
sudo apt-get install wvdial
2- for Email part, I used sendEmail which will use GMAIL account to send email.To install it use
TO Install sendEmail Tool …
mkdir /temp cd /temp wget http://caspian.dotconf.net/menu/Software/SendEmail/sendEmail-v1.56.tar.gz tar zxvf sendEmail-v1.56.tar.gz cd sendEmail-v1.56/
ADD SUPPORTING LIBRARY
for ubuntu
apt-get -y install libio-socket-ssl-perl libnet-ssleay-perl perl
for centos
yum -y install perl perl-Crypt-SSLeay perl-IO-Socket-SSL
SOLUTION!
the SCRIPT …
Schedule (cron) the following to run after every hour or as required.
Use following script.
#!/bin/bash # Linux BASH script to check MODEM Status (example wavecom or teltnokia serial modem or any other using wvdialconf) # If Modem not responding, then send SMS/EMail alert to admin (trigger one time for each status changed) # Useful for remote admins, who want to be informed when modem have any responding problem. # Created: 9th-JUNE-2016 # Syed Jahanzaib # aacable at hotmail dot com / https://aacable.wordpress.com # set -x # If you have kannel configured, then STOP KANNEL SERVICE first, so that it should not conflict with the wvdialconf results / locked pid / syed.jahanzaib # If you dont have kannel, remote these entries echo "Stopping Kannel Service to test modem results and sleep for 10 seconds so that kannel service can be shutdown gracefully..." service kannel stop > /dev/null 2>&1 sleep 10 killall -9 bearerbox > /dev/null 2>&1 echo "Kannel Service Stopped . Processing further ..." # You can name your modem, MAKE SURE THAT YOU ***DONOT*** ADD SPACES IN IT MODEM1="SERIAL_MODEM" # Text that will be checked in wvdialconf output file, if wvdialconf does not detects any modem, it usually add the following line # Sorry, no modem was detected! Is it in use by another program? # So we will simply use the grep to catch word **no modem**. You may use other technique that may work for you. Chill / zaib TEXT_TO_CATCH="no modem" # Hostname and other Variables HOSTNAME=`hostname` COMPANY="zaib (Pvt) Ltd." FOOTER="Powered By Syed.Jahanzaib" DATE=`date` # Temporary file holder for MODEM status MODEM1_STATUS_TMP_HOLDER="/tmp/modemstatus.txt" MODEM_QUERY_RESULT="/tmp/modem_query_result.txt" # Create temp file if not already present, usually for 1st time execution touch $MODEM1_STATUS_TMP_HOLDER touch $MODEM_QUERY_RESULT # SMS RELATED and KANNEL INFO # KANNEL SMS Gateway Info, will not be useful when modem is down, however it will be ok when moem will respond, # for down status, we have to use GMAIL to send email KANNELURL="127.0.0.1:13013" KANNELID="kannel" KANNELPASS="KANNELPASS" CELL1="03333021909" # GMAIL Section GMAILID="YOURGMAILID@gmail.com" GMAILPASS="YOURGMAILPASS" ADMINMAIL1="TO@hotmail.com" # sms/email message temporary holder MSGDOWNHOLDER="/tmp/$MODEM1_down.msg" MSGUPHOLDER="/tmp/$MODEM1_up.msg" ## SMS/EMAIL Messages for DOWN MSG_DOWN="ALERT: SMS $MODEM1 not responding @ $DATE. Try to restart it by power off/on. $COMPANY $FOOTER" ## SME/EMAIL Messages for UP MSG_UP="INFO: SMS $MODEM1 is now responding @ $DATE OK. $COMPANY $FOOTER" # RUN WVDIALCONF utility to output modem query result in $MODEM_QUERY_RESULT file wvdialconf > $MODEM_QUERY_RESULT # Run the script echo "Checking $MODEM1 Current Status @$DATE..." for MODEM in $MODEM1 do # Match $TEXT_TO_CATCH in the query result STATUS=`cat $MODEM_QUERY_RESULT | grep "$TEXT_TO_CATCH"` if [ -n "$STATUS" ]; then # Print Result for information purposes echo "ALERT: text ** $TEXT_TO_CATCH ** found in $MODEM_QUERY_RESULT" echo "$MODEM seems to be DOWN ..." # IF modem found DOWN, and email/SMS not already sent, then send it one time to $CELL1/x if [ $(grep -c "$MODEM" "$MODEM1_STATUS_TMP_HOLDER") -eq 0 ]; then echo "$MODEM is down at $(date) .. SENDING DOWN SMS/EMAIL for current incident / for one time only ..." # Update down message to be sent via sms/email echo "$MSG_DOWN" > $MSGDOWNHOLDER # Update Modem down status in a file so that sms/email should not be sent again and again echo "$MODEM1" > $MODEM1_STATUS_TMP_HOLDER #cat $MSGDOWNHOLDER # Sending DOWN SMS via KANNEL echo "Sending SMS , if modem is down, sms will not be sent ..." cat $MSGDOWNHOLDER | curl "http://$KANNELURL/cgi-bin/sendsms?username=$KANNELID&password=$KANNELPASS&to=$CELL1" -G --data-urlencode text@- ######## EMAIL SECTION ############## # Make sure you install sendEMAIL tool and test it properly before using email section. #SEND EMAIL Alert As well using sendEMAIL tool using GMAIL ADDRESS. # If you want to send email , use below ... echo "Sending SEMAIL ALERT to $ADMINMAIL1 ..." /temp/sendEmail-v1.56/sendEmail -u "ALERT: $MODEM1 not responding @ $DATE" -o tls=yes -s smtp.gmail.com:587 -t $ADMINMAIL1 -xu $GMAILID -xp $GMAILPASS -f $GMAILID -o message-file=$MSGDOWNHOLDER -o message-content-type=text fi # Else if $TEXT_TO_CATCH does not found in $MODEM_QUERY_RESULT, then consider MODEM is UP else echo "INFO: Word ** $TEXT_TO_CATCH ** was NOT found in $MODEM_QUERY_RESULT" echo "$MODEM seems to be responding OK!" # If modem found UP and last status was DOWN, then send UP msg one time if [ $(grep -c "$MODEM" "$MODEM1_STATUS_TMP_HOLDER") -eq 1 ]; then echo "$MODEM is now responding at $(date)... SENDING UP SMS for current incident one time only ..." echo "$MSG_UP" > $MSGUPHOLDER #cat $MSGUPHOLDER # START KANEL SERVICE SO THAT UP INFO SMM CAN BE SENT to ADMIN echo "Starting Kannel Services so that UP sms can be sent via kannel (with 5 seconds delay) ..." service kannel start > /dev/null 2>&1 sleep 5 # Sending UP SMS via KANNEL echo "Sending UP SMS , if modem is down, sms will not be sent ..." cat $MSGUPHOLDER | curl "http://$KANNELURL/cgi-bin/sendsms?username=$KANNELID&password=$KANNELPASS&to=$CELL1" -G --data-urlencode text@- ############## EMAIL SECTION ############## # Make sure you install sendEMAIL tool and test it properly before using email section. #SEND EMAIL Alert As well using sendEMAIL tool using GMAIL ADDRESS. # If you want to send email , use below ... echo "Sending SEMAIL UP/OK to $ADMINMAIL1 & $ADMINMAIL2 ..." /temp/sendEmail-v1.56/sendEmail -u "INFO: $MODEM1 responding now OK @ $DATE" -o tls=yes -s smtp.gmail.com:587 -t $ADMINMAIL1 -xu $GMAILID -xp $GMAILPASS -f $GMAILID -o message-file=$MSGDOWNHOLDER -o message-content-type=text # Update Modem UP status in a file so that sms/email should not be sent again and again sed -i "/$MODEM1/d" "$MODEM1_STATUS_TMP_HOLDER" fi fi done # START KANEL SERVICE IN END, because we stopped it in the beginning echo "Starting Kannel Services that we stopped in beginning of this script ..." service kannel start > /dev/null 2>&1 # Script Ends Here ... # z@iB
RESULT!
Filed under: Linux Related
