Howto send email from bash on DLink DNS-323¶

Software already installed on NAS¶

Sending mails from this device can be done using two programs which are already installed!

• msmtp

• mutt

Preparation¶

1. Make sure that you have ffp/funplug installed

2. Login to your DNS-323 (if there is no shell prompt write 5784468 to get it)

3. Create two files /mnt/HD_a2/ffp/start/crontab_update and /mnt/HD_a2/ffp/bin/do_sth.sh and make it executable (read whole post)

4. Reboot NAS, or run /mnt/HD_a2/ffp/start/crontab_update start

5. You should be done

crontab_update init script for ffp¶

Contents of crontab_update:

#!/ffp/bin/sh

# PROVIDE: crontab_update
# REQUIRE: LOGIN

#
# Email settings are taken from webadmin!
#

. /ffp/etc/ffp.subr

name="crontab_update"
start_cmd="crontab_update_start"

## CHANGES SECTION
# You must CHANGE settings below
SMTP=smtp.mail.com
USER=user@mail.com
SOURCE=user@mail.com
DEST=dest@mail.com
PASS=secret
## END OF CHANGES

crontab_update_start() {
 CRONTXT=/tmp/crontab.txt
 # start with existing crontab
 /bin/crontab -l > $CRONTXT

 # add the Rsync job to execute at 2:05 am - also create a logfile
 /bin/echo "0 20 * * 1-4 /mnt/HD_a2/ffp/bin/do_sth.sh &" >> $CRONTXT
 /bin/echo "15 16 * * 5 /mnt/HD_a2/ffp/bin/do_sth.sh &" >> $CRONTXT

 # We are now booting - send test email and enable mail
 if [ ! -e /.msmtprc -o ! -e /.muttrc ] ; then
         email -m 63 -h $SMTP -p 25 -a 1 -u $USER -w $PASS -s $SOURCE -d $DEST -t
         test -e /home/root/.msmtprc && ln -s /.msmtprc /home/root/
         test -e /home/root/.muttrc && ln -s /.muttrc  /home/root/
 fi

 # install the new crontab
 /bin/crontab $CRONTXT

 # clean up tmp crontab
 /bin/rm $CRONTXT
}

run_rc_command "$1"

do_sth script¶

• Location: /mnt/HD_a2/ffp/bin/do_sth.sh

• Make it executable: chmod +x /mnt/HD_a2/ffp/bin/do_sth.sh

Contents of: /mnt/HD_a2/ffp/bin/do_sth.sh

#!/bin/sh

#
# Simple script to do something
#

PATH=/mnt/HD_a2/ffp/bin/:$PATH
SRC_PATH='/mnt/HD_a2'
SPACE_REMAINING=`df -h`
RESULT=$?

echo -e "Process ended with result ===> $RESULT\n"\
"Space remaining:\n\n"\
"$SPACE_REMAINING"\
"\n\n"\
"Your DNS-323 (dlink-storage)"\
| mutt -s "Process status ("`date -I`")" dest@mail.com

How I’ve figured this out?¶

Made strings /sys/crfs/web and found email -h %s -p 25 -a 1 -u %s -w %s -s %s -d %s -t rest was just a matter of time - to get to know how to use it correct.

Common mistakes¶

• Sending email option must be enabled in webclient and tested

• Blogger sometimes changes „” to other characters (UTF-8), which Bash doesn’t understand, and whole process after copying files fail - make sure that you have „” and not some other characters in files

• If you are using Notepad or other editor without UNIX newline format support, you’re in trouble - Bash also can’t understand this - on Windows try to use Notepad++

• Changing email credentials is done by web interface

Additional links¶

• Crontab on DNS-323

• Crontab in general

Conclusion¶

DNS-323 is very powerful device you can even turn nearly every USB printer into network enabled, it can even change USB scanner into networked scanner which is pretty cool.

Copying¶

I would like to post this article, as a tip on DNS-323 wiki, with link to this post - anyone registered there?