+++ /dev/null
-#! /usr/bin/env python\r
-"""An RFC 2821 smtp proxy.\r
-\r
-Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]]\r
-\r
-Options:\r
-\r
- --nosetuid\r
- -n\r
- This program generally tries to setuid `nobody', unless this flag is\r
- set. The setuid call will fail if this program is not run as root (in\r
- which case, use this flag).\r
-\r
- --version\r
- -V\r
- Print the version number and exit.\r
-\r
- --class classname\r
- -c classname\r
- Use `classname' as the concrete SMTP proxy class. Uses `PureProxy' by\r
- default.\r
-\r
- --debug\r
- -d\r
- Turn on debugging prints.\r
-\r
- --help\r
- -h\r
- Print this message and exit.\r
-\r
-Version: %(__version__)s\r
-\r
-If localhost is not given then `localhost' is used, and if localport is not\r
-given then 8025 is used. If remotehost is not given then `localhost' is used,\r
-and if remoteport is not given, then 25 is used.\r
-"""\r
-\r
-# Overview:\r
-#\r
-# This file implements the minimal SMTP protocol as defined in RFC 821. It\r
-# has a hierarchy of classes which implement the backend functionality for the\r
-# smtpd. A number of classes are provided:\r
-#\r
-# SMTPServer - the base class for the backend. Raises NotImplementedError\r
-# if you try to use it.\r
-#\r
-# DebuggingServer - simply prints each message it receives on stdout.\r
-#\r
-# PureProxy - Proxies all messages to a real smtpd which does final\r
-# delivery. One known problem with this class is that it doesn't handle\r
-# SMTP errors from the backend server at all. This should be fixed\r
-# (contributions are welcome!).\r
-#\r
-# MailmanProxy - An experimental hack to work with GNU Mailman\r
-# <www.list.org>. Using this server as your real incoming smtpd, your\r
-# mailhost will automatically recognize and accept mail destined to Mailman\r
-# lists when those lists are created. Every message not destined for a list\r
-# gets forwarded to a real backend smtpd, as with PureProxy. Again, errors\r
-# are not handled correctly yet.\r
-#\r
-# Please note that this script requires Python 2.0\r
-#\r
-# Author: Barry Warsaw <barry@python.org>\r
-#\r
-# TODO:\r
-#\r
-# - support mailbox delivery\r
-# - alias files\r
-# - ESMTP\r
-# - handle error codes from the backend smtpd\r
-\r
-import sys\r
-import os\r
-import errno\r
-import getopt\r
-import time\r
-import socket\r
-import asyncore\r
-import asynchat\r
-\r
-__all__ = ["SMTPServer","DebuggingServer","PureProxy","MailmanProxy"]\r
-\r
-program = sys.argv[0]\r
-__version__ = 'Python SMTP proxy version 0.2'\r
-\r
-\r
-class Devnull:\r
- def write(self, msg): pass\r
- def flush(self): pass\r
-\r
-\r
-DEBUGSTREAM = Devnull()\r
-NEWLINE = '\n'\r
-EMPTYSTRING = ''\r
-COMMASPACE = ', '\r
-\r
-\r
-def usage(code, msg=''):\r
- print >> sys.stderr, __doc__ % globals()\r
- if msg:\r
- print >> sys.stderr, msg\r
- sys.exit(code)\r
-\r
-\r
-class SMTPChannel(asynchat.async_chat):\r
- COMMAND = 0\r
- DATA = 1\r
-\r
- def __init__(self, server, conn, addr):\r
- asynchat.async_chat.__init__(self, conn)\r
- self.__server = server\r
- self.__conn = conn\r
- self.__addr = addr\r
- self.__line = []\r
- self.__state = self.COMMAND\r
- self.__greeting = 0\r
- self.__mailfrom = None\r
- self.__rcpttos = []\r
- self.__data = ''\r
- self.__fqdn = socket.getfqdn()\r
- try:\r
- self.__peer = conn.getpeername()\r
- except socket.error, err:\r
- # a race condition may occur if the other end is closing\r
- # before we can get the peername\r
- self.close()\r
- if err[0] != errno.ENOTCONN:\r
- raise\r
- return\r
- print >> DEBUGSTREAM, 'Peer:', repr(self.__peer)\r
- self.push('220 %s %s' % (self.__fqdn, __version__))\r
- self.set_terminator('\r\n')\r
-\r
- # Overrides base class for convenience\r
- def push(self, msg):\r
- asynchat.async_chat.push(self, msg + '\r\n')\r
-\r
- # Implementation of base class abstract method\r
- def collect_incoming_data(self, data):\r
- self.__line.append(data)\r
-\r
- # Implementation of base class abstract method\r
- def found_terminator(self):\r
- line = EMPTYSTRING.join(self.__line)\r
- print >> DEBUGSTREAM, 'Data:', repr(line)\r
- self.__line = []\r
- if self.__state == self.COMMAND:\r
- if not line:\r
- self.push('500 Error: bad syntax')\r
- return\r
- method = None\r
- i = line.find(' ')\r
- if i < 0:\r
- command = line.upper()\r
- arg = None\r
- else:\r
- command = line[:i].upper()\r
- arg = line[i+1:].strip()\r
- method = getattr(self, 'smtp_' + command, None)\r
- if not method:\r
- self.push('502 Error: command "%s" not implemented' % command)\r
- return\r
- method(arg)\r
- return\r
- else:\r
- if self.__state != self.DATA:\r
- self.push('451 Internal confusion')\r
- return\r
- # Remove extraneous carriage returns and de-transparency according\r
- # to RFC 821, Section 4.5.2.\r
- data = []\r
- for text in line.split('\r\n'):\r
- if text and text[0] == '.':\r
- data.append(text[1:])\r
- else:\r
- data.append(text)\r
- self.__data = NEWLINE.join(data)\r
- status = self.__server.process_message(self.__peer,\r
- self.__mailfrom,\r
- self.__rcpttos,\r
- self.__data)\r
- self.__rcpttos = []\r
- self.__mailfrom = None\r
- self.__state = self.COMMAND\r
- self.set_terminator('\r\n')\r
- if not status:\r
- self.push('250 Ok')\r
- else:\r
- self.push(status)\r
-\r
- # SMTP and ESMTP commands\r
- def smtp_HELO(self, arg):\r
- if not arg:\r
- self.push('501 Syntax: HELO hostname')\r
- return\r
- if self.__greeting:\r
- self.push('503 Duplicate HELO/EHLO')\r
- else:\r
- self.__greeting = arg\r
- self.push('250 %s' % self.__fqdn)\r
-\r
- def smtp_NOOP(self, arg):\r
- if arg:\r
- self.push('501 Syntax: NOOP')\r
- else:\r
- self.push('250 Ok')\r
-\r
- def smtp_QUIT(self, arg):\r
- # args is ignored\r
- self.push('221 Bye')\r
- self.close_when_done()\r
-\r
- # factored\r
- def __getaddr(self, keyword, arg):\r
- address = None\r
- keylen = len(keyword)\r
- if arg[:keylen].upper() == keyword:\r
- address = arg[keylen:].strip()\r
- if not address:\r
- pass\r
- elif address[0] == '<' and address[-1] == '>' and address != '<>':\r
- # Addresses can be in the form <person@dom.com> but watch out\r
- # for null address, e.g. <>\r
- address = address[1:-1]\r
- return address\r
-\r
- def smtp_MAIL(self, arg):\r
- print >> DEBUGSTREAM, '===> MAIL', arg\r
- address = self.__getaddr('FROM:', arg) if arg else None\r
- if not address:\r
- self.push('501 Syntax: MAIL FROM:<address>')\r
- return\r
- if self.__mailfrom:\r
- self.push('503 Error: nested MAIL command')\r
- return\r
- self.__mailfrom = address\r
- print >> DEBUGSTREAM, 'sender:', self.__mailfrom\r
- self.push('250 Ok')\r
-\r
- def smtp_RCPT(self, arg):\r
- print >> DEBUGSTREAM, '===> RCPT', arg\r
- if not self.__mailfrom:\r
- self.push('503 Error: need MAIL command')\r
- return\r
- address = self.__getaddr('TO:', arg) if arg else None\r
- if not address:\r
- self.push('501 Syntax: RCPT TO: <address>')\r
- return\r
- self.__rcpttos.append(address)\r
- print >> DEBUGSTREAM, 'recips:', self.__rcpttos\r
- self.push('250 Ok')\r
-\r
- def smtp_RSET(self, arg):\r
- if arg:\r
- self.push('501 Syntax: RSET')\r
- return\r
- # Resets the sender, recipients, and data, but not the greeting\r
- self.__mailfrom = None\r
- self.__rcpttos = []\r
- self.__data = ''\r
- self.__state = self.COMMAND\r
- self.push('250 Ok')\r
-\r
- def smtp_DATA(self, arg):\r
- if not self.__rcpttos:\r
- self.push('503 Error: need RCPT command')\r
- return\r
- if arg:\r
- self.push('501 Syntax: DATA')\r
- return\r
- self.__state = self.DATA\r
- self.set_terminator('\r\n.\r\n')\r
- self.push('354 End data with <CR><LF>.<CR><LF>')\r
-\r
-\r
-class SMTPServer(asyncore.dispatcher):\r
- def __init__(self, localaddr, remoteaddr):\r
- self._localaddr = localaddr\r
- self._remoteaddr = remoteaddr\r
- asyncore.dispatcher.__init__(self)\r
- try:\r
- self.create_socket(socket.AF_INET, socket.SOCK_STREAM)\r
- # try to re-use a server port if possible\r
- self.set_reuse_addr()\r
- self.bind(localaddr)\r
- self.listen(5)\r
- except:\r
- # cleanup asyncore.socket_map before raising\r
- self.close()\r
- raise\r
- else:\r
- print >> DEBUGSTREAM, \\r
- '%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % (\r
- self.__class__.__name__, time.ctime(time.time()),\r
- localaddr, remoteaddr)\r
-\r
- def handle_accept(self):\r
- pair = self.accept()\r
- if pair is not None:\r
- conn, addr = pair\r
- print >> DEBUGSTREAM, 'Incoming connection from %s' % repr(addr)\r
- channel = SMTPChannel(self, conn, addr)\r
-\r
- # API for "doing something useful with the message"\r
- def process_message(self, peer, mailfrom, rcpttos, data):\r
- """Override this abstract method to handle messages from the client.\r
-\r
- peer is a tuple containing (ipaddr, port) of the client that made the\r
- socket connection to our smtp port.\r
-\r
- mailfrom is the raw address the client claims the message is coming\r
- from.\r
-\r
- rcpttos is a list of raw addresses the client wishes to deliver the\r
- message to.\r
-\r
- data is a string containing the entire full text of the message,\r
- headers (if supplied) and all. It has been `de-transparencied'\r
- according to RFC 821, Section 4.5.2. In other words, a line\r
- containing a `.' followed by other text has had the leading dot\r
- removed.\r
-\r
- This function should return None, for a normal `250 Ok' response;\r
- otherwise it returns the desired response string in RFC 821 format.\r
-\r
- """\r
- raise NotImplementedError\r
-\r
-\r
-class DebuggingServer(SMTPServer):\r
- # Do something with the gathered message\r
- def process_message(self, peer, mailfrom, rcpttos, data):\r
- inheaders = 1\r
- lines = data.split('\n')\r
- print '---------- MESSAGE FOLLOWS ----------'\r
- for line in lines:\r
- # headers first\r
- if inheaders and not line:\r
- print 'X-Peer:', peer[0]\r
- inheaders = 0\r
- print line\r
- print '------------ END MESSAGE ------------'\r
-\r
-\r
-class PureProxy(SMTPServer):\r
- def process_message(self, peer, mailfrom, rcpttos, data):\r
- lines = data.split('\n')\r
- # Look for the last header\r
- i = 0\r
- for line in lines:\r
- if not line:\r
- break\r
- i += 1\r
- lines.insert(i, 'X-Peer: %s' % peer[0])\r
- data = NEWLINE.join(lines)\r
- refused = self._deliver(mailfrom, rcpttos, data)\r
- # TBD: what to do with refused addresses?\r
- print >> DEBUGSTREAM, 'we got some refusals:', refused\r
-\r
- def _deliver(self, mailfrom, rcpttos, data):\r
- import smtplib\r
- refused = {}\r
- try:\r
- s = smtplib.SMTP()\r
- s.connect(self._remoteaddr[0], self._remoteaddr[1])\r
- try:\r
- refused = s.sendmail(mailfrom, rcpttos, data)\r
- finally:\r
- s.quit()\r
- except smtplib.SMTPRecipientsRefused, e:\r
- print >> DEBUGSTREAM, 'got SMTPRecipientsRefused'\r
- refused = e.recipients\r
- except (socket.error, smtplib.SMTPException), e:\r
- print >> DEBUGSTREAM, 'got', e.__class__\r
- # All recipients were refused. If the exception had an associated\r
- # error code, use it. Otherwise,fake it with a non-triggering\r
- # exception code.\r
- errcode = getattr(e, 'smtp_code', -1)\r
- errmsg = getattr(e, 'smtp_error', 'ignore')\r
- for r in rcpttos:\r
- refused[r] = (errcode, errmsg)\r
- return refused\r
-\r
-\r
-class MailmanProxy(PureProxy):\r
- def process_message(self, peer, mailfrom, rcpttos, data):\r
- from cStringIO import StringIO\r
- from Mailman import Utils\r
- from Mailman import Message\r
- from Mailman import MailList\r
- # If the message is to a Mailman mailing list, then we'll invoke the\r
- # Mailman script directly, without going through the real smtpd.\r
- # Otherwise we'll forward it to the local proxy for disposition.\r
- listnames = []\r
- for rcpt in rcpttos:\r
- local = rcpt.lower().split('@')[0]\r
- # We allow the following variations on the theme\r
- # listname\r
- # listname-admin\r
- # listname-owner\r
- # listname-request\r
- # listname-join\r
- # listname-leave\r
- parts = local.split('-')\r
- if len(parts) > 2:\r
- continue\r
- listname = parts[0]\r
- if len(parts) == 2:\r
- command = parts[1]\r
- else:\r
- command = ''\r
- if not Utils.list_exists(listname) or command not in (\r
- '', 'admin', 'owner', 'request', 'join', 'leave'):\r
- continue\r
- listnames.append((rcpt, listname, command))\r
- # Remove all list recipients from rcpttos and forward what we're not\r
- # going to take care of ourselves. Linear removal should be fine\r
- # since we don't expect a large number of recipients.\r
- for rcpt, listname, command in listnames:\r
- rcpttos.remove(rcpt)\r
- # If there's any non-list destined recipients left,\r
- print >> DEBUGSTREAM, 'forwarding recips:', ' '.join(rcpttos)\r
- if rcpttos:\r
- refused = self._deliver(mailfrom, rcpttos, data)\r
- # TBD: what to do with refused addresses?\r
- print >> DEBUGSTREAM, 'we got refusals:', refused\r
- # Now deliver directly to the list commands\r
- mlists = {}\r
- s = StringIO(data)\r
- msg = Message.Message(s)\r
- # These headers are required for the proper execution of Mailman. All\r
- # MTAs in existence seem to add these if the original message doesn't\r
- # have them.\r
- if not msg.getheader('from'):\r
- msg['From'] = mailfrom\r
- if not msg.getheader('date'):\r
- msg['Date'] = time.ctime(time.time())\r
- for rcpt, listname, command in listnames:\r
- print >> DEBUGSTREAM, 'sending message to', rcpt\r
- mlist = mlists.get(listname)\r
- if not mlist:\r
- mlist = MailList.MailList(listname, lock=0)\r
- mlists[listname] = mlist\r
- # dispatch on the type of command\r
- if command == '':\r
- # post\r
- msg.Enqueue(mlist, tolist=1)\r
- elif command == 'admin':\r
- msg.Enqueue(mlist, toadmin=1)\r
- elif command == 'owner':\r
- msg.Enqueue(mlist, toowner=1)\r
- elif command == 'request':\r
- msg.Enqueue(mlist, torequest=1)\r
- elif command in ('join', 'leave'):\r
- # TBD: this is a hack!\r
- if command == 'join':\r
- msg['Subject'] = 'subscribe'\r
- else:\r
- msg['Subject'] = 'unsubscribe'\r
- msg.Enqueue(mlist, torequest=1)\r
-\r
-\r
-class Options:\r
- setuid = 1\r
- classname = 'PureProxy'\r
-\r
-\r
-def parseargs():\r
- global DEBUGSTREAM\r
- try:\r
- opts, args = getopt.getopt(\r
- sys.argv[1:], 'nVhc:d',\r
- ['class=', 'nosetuid', 'version', 'help', 'debug'])\r
- except getopt.error, e:\r
- usage(1, e)\r
-\r
- options = Options()\r
- for opt, arg in opts:\r
- if opt in ('-h', '--help'):\r
- usage(0)\r
- elif opt in ('-V', '--version'):\r
- print >> sys.stderr, __version__\r
- sys.exit(0)\r
- elif opt in ('-n', '--nosetuid'):\r
- options.setuid = 0\r
- elif opt in ('-c', '--class'):\r
- options.classname = arg\r
- elif opt in ('-d', '--debug'):\r
- DEBUGSTREAM = sys.stderr\r
-\r
- # parse the rest of the arguments\r
- if len(args) < 1:\r
- localspec = 'localhost:8025'\r
- remotespec = 'localhost:25'\r
- elif len(args) < 2:\r
- localspec = args[0]\r
- remotespec = 'localhost:25'\r
- elif len(args) < 3:\r
- localspec = args[0]\r
- remotespec = args[1]\r
- else:\r
- usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args))\r
-\r
- # split into host/port pairs\r
- i = localspec.find(':')\r
- if i < 0:\r
- usage(1, 'Bad local spec: %s' % localspec)\r
- options.localhost = localspec[:i]\r
- try:\r
- options.localport = int(localspec[i+1:])\r
- except ValueError:\r
- usage(1, 'Bad local port: %s' % localspec)\r
- i = remotespec.find(':')\r
- if i < 0:\r
- usage(1, 'Bad remote spec: %s' % remotespec)\r
- options.remotehost = remotespec[:i]\r
- try:\r
- options.remoteport = int(remotespec[i+1:])\r
- except ValueError:\r
- usage(1, 'Bad remote port: %s' % remotespec)\r
- return options\r
-\r
-\r
-if __name__ == '__main__':\r
- options = parseargs()\r
- # Become nobody\r
- if options.setuid:\r
- try:\r
- import pwd\r
- except ImportError:\r
- print >> sys.stderr, \\r
- 'Cannot import module "pwd"; try running with -n option.'\r
- sys.exit(1)\r
- nobody = pwd.getpwnam('nobody')[2]\r
- try:\r
- os.setuid(nobody)\r
- except OSError, e:\r
- if e.errno != errno.EPERM: raise\r
- print >> sys.stderr, \\r
- 'Cannot setuid "nobody"; try running with -n option.'\r
- sys.exit(1)\r
- classname = options.classname\r
- if "." in classname:\r
- lastdot = classname.rfind(".")\r
- mod = __import__(classname[:lastdot], globals(), locals(), [""])\r
- classname = classname[lastdot+1:]\r
- else:\r
- import __main__ as mod\r
- class_ = getattr(mod, classname)\r
- proxy = class_((options.localhost, options.localport),\r
- (options.remotehost, options.remoteport))\r
- try:\r
- asyncore.loop()\r
- except KeyboardInterrupt:\r
- pass\r
projects / mirror_edk2.git / blobdiff