Bering-uClibc 7.x - User Guide - Basic Configuration - Email Alerts

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Basic Configuration - Email Alerts
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Examples of email alerts

This is a series of email examples that are complementing the Bering-uClibc builtin email notification found in the master configuration file [ lrcfg... 2) system configuration... 1) Master LRP settings... ] . These examples show how to adapt to the recent changes in smtp servers requirements.

Email notification example using your own ISP SMTP server or Google's:

If your ISP provides you with an email account, using their SMTP server to send notification emails is the simplest method since most will only require a simple authentication username & password. Some might use TLS/SSL in which case simply use curl otherwise you will need to get a certificate. In any case check your ISP SMTP server requirements. Last resort (joking...), if you have a Google account and certificate, you can use their SMTP server.

For the emails to get out you will have to add these rules to /etc/shorewall/rules

# pour les mails de Videotron....
SMTP(ACCEPT)    fw       net
ACCEPT          fw       net    tcp 587
ACCEPT          fw       net    tcp 465

This example will send an email when the router dynamic IP address changes

The script is saved as /etc/cron.daily/mailIP so it is executed daily at 06:42.

You should also realize that this is a cheap way of getting your dynamic IP address, should it change, without using a so called free dynamic DNS service. They are not always a reliable long term solution, remember DYNDNS !!!

Using sendmail: with simple authentication username & password

The code can be found in this forum, along with many other hints...

firewall# cat mailIP
  # transmit the IP address when it changes...
  IPNOW=$(ip addr | grep 255.255. | sed -n 's/^ *inet *\([.0-9]*\).*/\1/p')
  if grep -q $IPNOW /tmp/MyIP.log
  echo "No change"
  echo $IPNOW > /tmp/MyIP.log
  echo "Subject: today IP address: $IPNOW !!! " > /tmp/MyIP1.log
  echo "From: root@firewall" >> /tmp/MyIP1.log
  echo "Date:  `date -R`" >> /tmp/MyIP1.log
  echo "" >> /tmp/MyIP1.log
  echo "Hello my dear Creator" >> /tmp/MyIP1.log
  echo "" >> /tmp/MyIP1.log
  echo "my IP is now:  $IPNOW" >> /tmp/MyIP1.log
  echo "Uptime is: `uptime | cut -d ',' -f1 | sed 's/^.\{12\}//g'`" >> /tmp/MyIP1.log
  echo "" >> /tmp/MyIP1.log
  echo "---- " >> /tmp/MyIP1.log
  echo "from your friendly Router  !!!" >> /tmp/MyIP1.log
  echo "" >> /tmp/MyIP1.log
  echo "" >> /tmp/MyIP1.log
  sendmail -S </tmp/MyIP1.log -froot@firewall -auxxxxxxxx -apyyyyyyyy

Using sendmail: with SSL/TLS

1- obtain a certificate:

cd  (to /root)
mv roots.pem google-roots.pem

Look here for references:

I had some issues with the Equifax Certificate using this:

2- replace the previous sendmail stanza with this one:

sendmail -H"exec openssl s_client -quiet -CAfile /root/google-roots.pem -connect -tls1 -pause" </tmp/MyIP1.log -froot@firewall -auxxxxxxxx -apyyyyyyyy

  • Using curl: replace the sendmail stanza with this one:
  curl --url smtps:// --mail-from root@firewall --mail-rcpt    --upload-file /tmp/MyIP1.log --ssl-reqd --user xxxxxxxx:yyyyyyyy --insecure

  • Using Google's SMTP: again replace the previous sendmail stanza with this one...
cat /tmp/MyIP1.log | sendmail -H"exec openssl s_client -quiet -CAfile /root/google-roots.pem -connect -tls1 -starttls smtp"   -apyourgmailpassw

Periodic notifications

Maybe if you are like me, you would like your router to report regularly to you that it's alive and well, but without flooding your emails. Then have it send a weekly or monthly notification like so:

add this script as /etc/cron.weekly/mailIP_week

firewall# cat mailIP_week
 # PURPOSE: e-Mail me my external IP every week...
 echo "" > /tmp/MyIP.log

you get the picture...

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