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Sending Email

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TeHashX edited this page Feb 19, 2013 · 24 revisions

Asuswrt-Merlin includes a cutdown version of sendmail which can be used to send mail from the router. Basic usage will look like this:

echo "This is a test email." | /usr/sbin/sendmail -S"smtp.yourisp.com" -f"[email protected]" [email protected]

You can send a more proper Email by writing the mail to a file, and then piping it to sendmail. The following example, if saved as a wan-start script, will make your router send you an Email whenever the WAN interface comes up, containing the WAN IP:

#!/bin/sh
SMTP="smtp.yourisp.com"
FROM="[email protected]"
FROMNAME="Your Router"
TO="[email protected]"

echo "Subject: WAN state notification" >/tmp/mail.txt
echo "From: \\"$FROMNAME\\"<$FROM>" >>/tmp/mail.txt
echo "Date: `date -R`" >>/tmp/mail.txt
echo "I just got connected to the Interwebz." >>/tmp/mail.txt
echo "My new IP is: `nvram get wan0_ipaddr`" >>/tmp/mail.txt
echo "" >>/tmp/mail.txt
echo "--- " >>/tmp/mail.txt
echo "Your friendly router." >>/tmp/mail.txt
echo "" ­­>>/tmp/mail.txt

cat /tmp/mail.txt | /usr/sbin/sendmail -S"$SMTP" -f"$FROM" $TO

rm /tmp/mail.txt

If your SMTP server requires authentication, you can pass them as additional arguments. To see the available options, just run "sendmail -h".

If you don't have a smtp mail account from your ISP (gmail doesn't alow plain auth), JANGO SMTP could be the solution, it ofers 200 emails to send per month for free and should be enough. Just signup for a free account, and after email confirmation, go to Settings/Advanced/FromAddresses and create one or more "from address".

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Now just fill your wan-start script with the following lines but don't forget to replace first your-jangosmtp-fromaddress, your-jangomail-username, your-jangomail-password and your-email-address where to receive notifications.

#!/bin/sh
SMTP="relay.jangosmtp.net:587"
FROM="your-jangosmtp-fromaddress"
FROMNAME="ASUS ROUTER"
TO="your-email-address"

ntpclient -h pool.ntp.org -s &> /dev/null
sleep 5

echo "Subject: WAN state notification" >/tmp/mail.txt
echo "From: \\"$FROMNAME\\"<$FROM>" >>/tmp/mail.txt
echo "Date: `date -R`" >>/tmp/mail.txt
echo "" >>/tmp/mail.txt
echo "I just got connected to the internet." >>/tmp/mail.txt
echo "" >>/tmp/mail.txt
echo "My WAN IP is: `nvram get wan0_ipaddr`" >>/tmp/mail.txt
echo "Uptime is: `uptime | cut -d ',' -f1 | sed 's/^.\{12\}//g'`" >>/tmp/mail.txt
echo "" >>/tmp/mail.txt
echo "---- " >>/tmp/mail.txt
echo "Your friendly router." >>/tmp/mail.txt
echo "" >>/tmp/mail.txt

cat /tmp/mail.txt | /usr/sbin/sendmail -S"$SMTP" -f"$FROM" $TO -au"your-jangomail-username" -ap"your-jangomail-password"

rm /tmp/mail.txt
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