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 Post subject: Email from LinHES box
PostPosted: Sat Feb 13, 2021 4:37 pm 
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Joined: Sat Jun 05, 2004 2:00 pm
Posts: 37
Location: St. Paul, MN
Is there a recommended way to send emails from a LinHES box? I would like to use a command line based method to send an email depending on the return status of a script.

This topic has been brought up at least twice before, in 2007 http://forums.linhes.org/viewtopic.php?f=5&t=1617 and in 2011 http://forums.linhes.org/viewtopic.php?f=21&t=22246. Is there anything current baked in to LinHES or something that can be installed from a package to accomplish this?

Is anyone doing this and have a method you like?

Thanks


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PostPosted: Sat Feb 13, 2021 5:37 pm 
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Joined: Sat Jan 06, 2007 7:08 pm
Posts: 124
I do believe I played around with postfix a while back. I forget the details.

I think postfix tries to configure itself for you upon initial invocation.

postfix is in the linhes 'extra' repo.

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DH87MC i7-4770 16GB ram Xonar Essence ST geforce 710 LinHes 8.6


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PostPosted: Mon Feb 15, 2021 8:08 am 
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Joined: Wed Jan 07, 2004 12:14 pm
Posts: 415
Location: Charlotte, NC
Yes it is quite easy... I use email alerts for a lot of things on my Myth box. See https://rtcamp.com/tutorials/linux/ubun ... mail-smtp/ for instructions to configure postfix (you will have to get the app from 'extra'). After installation and configuration, make sure you restart postfix...

postfix stop
postfix start

I have one script file that calls postfix and I call that script file from several places within the system (ie one common script for everything).

#!/bin/bash
sendmail xxxxxxxx@yyyyyyyyyy.com <<EOF
From:xxxxxxxxx@gmail.com
subject:Mythtv Alert
$*
EOF

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Backend server - 4.0 TB 3.0ghz dual core 6 gig RAM, nVidia 9400, Gigabyte GA-870A-UD3 MB, 2 HD-5500, 2 HD Homerun dual tuners, 3 frontend machines - LinHES 8.6.1


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PostPosted: Sat Mar 27, 2021 7:13 pm 
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Joined: Sat Jun 05, 2004 2:00 pm
Posts: 37
Location: St. Paul, MN
I ended up implementing this method. The advantage is that it does not require the installation or setup of any software beyond what comes with a vanilla install of LinHES. The disadvantage is that it requires the sender's email address and password in plain text in the script file. It requires a smtp_ssl type connection, which is the type gmail uses. So I created a new gmail account, and that account is the one that sends the email message from the LinHES box. I've been using this for a couple months now and its been working great for me.

This version sends the contents of a file as the body of the message:
Code:
$ cat email_body.py
#!/usr/bin/python2

# https://realpython.com/python-send-email/
# https://www.tutorialspoint.com/python/python_command_line_arguments.htm

# email a file as the body of a plain text email
# usage: email_attach.py -r <receipient email address> -s <subject>  -f </path/to/file>
# assumes the smtp server uses smtp_ssl, gmail for example
# Note:  senders email credentials are in plain text in this file

import sys, getopt
import email, smtplib, ssl
import sys
import os.path

def options(argv):
   from os import path

   exit_code = 0
   receiver_email = ''
   subject = ''
   body_file = ''
   try:
      opts, args = getopt.getopt(argv,"hr:s:f:")
   except getopt.GetoptError:
      print 'Illegal option'
      exit_code = exit_code + 2
   for opt, arg in opts:
      if opt == '-h':
         exit_code = exit_code + 1
      elif opt == '-r':
         receiver_email = arg
      elif opt == '-s':
         subject = arg
      elif opt == '-f':
         body_file = arg
      else:
         print 'unrecognized option: ' + opt
         exit_code = exit_code + 4
   if body_file != '':
      if path.isfile(body_file) == False:
         print 'File: ' + body_file + ' not found'
         exit_code = exit_code + 32
   else:
      print '<filename> is undefined'
      exit_code = exit_code + 64
   if receiver_email == '':
      print '<email addr> is undefined'
      exit_code = exit_code + 128
   if exit_code > 0:
      print str(sys.argv[0]) + '-r <email_addr> -s <subject> -f <email_body_fiile>'
      if exit_code > 1:
         print 'Error: ' + str(exit_code)
      sys.exit(exit_code)
   return receiver_email, subject, body_file;

def send_email(receiver_email, subject, body_file):
   from email import encoders
   from email.mime.base import MIMEBase
   from email.mime.multipart import MIMEMultipart
   from email.mime.text import MIMEText
   
   sender_email = “myemailaddress@gmail.com"
   password = “myPassword123”
   
   # Create a multipart message and set headers
   message = MIMEMultipart()
   message["From"] = sender_email
   message["To"] = receiver_email
   message["Subject"] = subject
   #message["Bcc"] = receiver_email  # Recommended for mass emails
   
   # Add body to email
   fp = open(body_file, 'r')
   message.attach(MIMEText(fp.read()))
   fp.close()
   #message.attach(MIMEText(body, "plain"))
   
   # Log in to server using secure context and send email
   server = smtplib.SMTP_SSL("smtp.gmail.com", 465)
   server.login(sender_email, password)
   server.sendmail(sender_email, receiver_email, message.as_string())
   
if __name__ == "__main__":
   #print str(sys.argv)
   receiver_email, subject, body_file = options(sys.argv[1:])
   send_email(receiver_email, subject, body_file)


This is how I call the script from within a bash script:
Code:
/usr/bin/python2 /home/user/bin/email_body.py -r "${receiver_email}" -s "${subject}" -f "${thepath}${thefile}"


Here is a version that sends a file as an attachment:
Code:
$ cat email_attach.py
#!/usr/bin/python2

# https://realpython.com/python-send-email/
# https://www.tutorialspoint.com/python/python_command_line_arguments.htm

# email a file as an attachment
# usage: email_attach.py -r <receipient email address> -s <subject>  -b <body message> -f </path/to/file>
# assumes the smtp server uses smtp_ssl, gmail for example
# Note:  senders email credentials are in plain text in this file

import sys, getopt
import email, smtplib, ssl
import sys
import os.path

def options(argv):
   from os import path

   exit_code = 0
   receiver_email = ''
   subject = ''
   body = ''
   filename = ''
   try:
      opts, args = getopt.getopt(argv,"hr:s:b:f:")
   except getopt.GetoptError:
      print 'Illegal option'
      exit_code = exit_code + 2
   for opt, arg in opts:
      if opt == '-h':
         exit_code = exit_code + 1
      elif opt == '-r':
         receiver_email = arg
      elif opt == '-s':
         subject = arg
      elif opt == '-b':
         body = arg
      elif opt == '-f':
         filename = arg
      else:
         print 'unrecognized option: ' + opt
         exit_code = exit_code + 4
   if filename != '':
      if path.isfile(filename) == False:
         print 'File: ' + filename + ' not found'
         exit_code = exit_code + 8
   else:
      print '<filename> is undefined'
      exit_code = exit_code + 16
   if receiver_email == '':
      print '<email addr> is undefined'
      exit_code = exit_code + 32
   if exit_code > 0:
      print str(sys.argv[0]) + '-r <email_addr> -s <subject> -b <email_body> -f </path/to/file>'
      if exit_code > 1:
         print 'Error: ' + str(exit_code)
      sys.exit(exit_code)
   basefilename = path.basename(filename)
   return receiver_email, subject, body, filename, basefilename;

def send_email(receiver_email, subject, body, filename, basefilename):
   from email import encoders
   from email.mime.base import MIMEBase
   from email.mime.multipart import MIMEMultipart
   from email.mime.text import MIMEText
   
   sender_email = “myemailaddress@gmail.com"
   password = “myPassword123”
   
   # Create a multipart message and set headers
   message = MIMEMultipart()
   message["From"] = sender_email
   message["To"] = receiver_email
   message["Subject"] = subject
   #message["Bcc"] = receiver_email  # Recommended for mass emails
   
   # Add body to email
   message.attach(MIMEText(body, "plain"))
   
   with open(filename, "rb") as attachment:
       # Add file as application/octet-stream
       # Email client can usually download this automatically as attachment
       part = MIMEBase("application", "octet-stream")
       part.set_payload(attachment.read())
   
   # Encode file in ASCII characters to send by email   
   encoders.encode_base64(part)
   
   # Add header as key/value pair to attachment part
   part.add_header(
       "Content-Disposition",
       "attachment; filename= " + basefilename,
   )
   
   # Add attachment to message and convert message to string
   message.attach(part)
   text = message.as_string()
   
   # Log in to server using secure context and send email
   server = smtplib.SMTP_SSL("smtp.gmail.com", 465)
   server.login(sender_email, password)
   server.sendmail(sender_email, receiver_email, text)
   
if __name__ == "__main__":
   #print str(sys.argv)
   receiver_email, subject, body, filename, basefilename = options(sys.argv[1:])
   send_email(receiver_email, subject, body, filename, basefilename)


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