smtpd-redirectd

SMTP redirect daemon for malconfigured proprietary email sending software.
git clone git://arztpraxis-lohmann.de/smtpd-redirectd
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smtpd-redirectd (1283B)

      1 #!/usr/bin/env python3
      2 # coding=utf-8
      3 #
      4 # (c) 2019-2022 Christoph Lohmann <20h@r-36.net>
      5 #
      6 # This file is published under the terms of the GPLv3.
      7 #
      8 
      9 import os
     10 import sys
     11 import getopt
     12 import smtpd
     13 import asyncore
     14 import subprocess
     15 
     16 class SMTPRedirectd(smtpd.SMTPServer):
     17 	sendcmd = None
     18 	def process_message(self, peer, mailfrom, rcpttos, data):
     19 		sendproc = subprocess.Popen(sendcmd, shell=True, \
     20 			stdin=subprocess.PIPE, close_fds=True)
     21 		sendproc.stdin.write(data.encode())
     22 		sendproc.stdin.close()
     23 		sendproc.wait()
     24 
     25 def usage(app):
     26 	app = os.path.basename(app)
     27 	print("usage: %s [-hd] [sendcmd ...]" % (app), file=sys.stderr)
     28 	sys.exit(1)
     29 
     30 def main(args):
     31 	try:
     32 		opts, largs = getopt.getopt(args[1:], "h")
     33 	except getopt.GetoptError as err:
     34 		print(str(err))
     35 		usage(args[0])
     36 
     37 	sendcmd = "sudo -u praxis msmtp -t -C /home/praxis/.msmtprc"
     38 	dodebug = 0
     39 	for o, a in opts:
     40 		if o == "-h":
     41 			usage(args[0])
     42 		elif o == "-d":
     43 			dodebug = 1
     44 		else:
     45 			assert False, "unhandled option"
     46 
     47 	if len(largs) > 0:
     48 		sendcmd = " ".join(largs)
     49 
     50 	if dodebug == 1:
     51 		server = smtpd.DebuggingServer(('127.0.0.1', 25), None)
     52 	else:
     53 		server = SMTPRedirectd(('127.0.0.1', 25), None)
     54 		server.sendcmd = sendcmd
     55 	asyncore.loop()
     56 
     57 	return 0
     58 
     59 if __name__ == "__main__":
     60 	sys.exit(main(sys.argv))
     61