FM / python3.9

/usr/lib64/python3.9

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
config-3.9-x86_64-linux-gnu/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
ensurepip/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
site-packages/	-	0755	rm
sqlite3/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
zoneinfo/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	4920	0644	edit dl rm
aifc.py	32605	0644	edit dl rm
antigravity.py	500	0644	edit dl rm
argparse.py	98119	0644	edit dl rm
ast.py	56256	0644	edit dl rm
asynchat.py	11321	0644	edit dl rm
asyncore.py	20102	0644	edit dl rm
base64.py	19859	0755	edit dl rm
bdb.py	31389	0644	edit dl rm
binhex.py	14784	0644	edit dl rm
bisect.py	2350	0644	edit dl rm
bz2.py	12447	0644	edit dl rm
calendar.py	24832	0644	edit dl rm
cgi.py	33932	0755	edit dl rm
cgitb.py	12096	0644	edit dl rm
chunk.py	5435	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10622	0644	edit dl rm
codecs.py	36673	0644	edit dl rm
codeop.py	6326	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	20105	0644	edit dl rm
configparser.py	54584	0644	edit dl rm
contextlib.py	24624	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8650	0644	edit dl rm
copyreg.py	7274	0644	edit dl rm
cProfile.py	6345	0755	edit dl rm
crypt.py	3819	0644	edit dl rm
csv.py	16144	0644	edit dl rm
dataclasses.py	49586	0644	edit dl rm
datetime.py	89177	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	83307	0644	edit dl rm
dis.py	20570	0644	edit dl rm
doctest.py	104568	0644	edit dl rm
enum.py	39440	0644	edit dl rm
filecmp.py	10024	0644	edit dl rm
fileinput.py	14791	0644	edit dl rm
fnmatch.py	6004	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	24323	0644	edit dl rm
ftplib.py	35496	0644	edit dl rm
functools.py	38881	0644	edit dl rm
genericpath.py	5246	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5990	0644	edit dl rm
gettext.py	27266	0644	edit dl rm
glob.py	5823	0644	edit dl rm
graphlib.py	9573	0644	edit dl rm
gzip.py	21772	0644	edit dl rm
hashlib.py	8069	0644	edit dl rm
heapq.py	22877	0644	edit dl rm
hmac.py	8043	0644	edit dl rm
imaplib.py	55256	0644	edit dl rm
imghdr.py	3808	0644	edit dl rm
imp.py	10536	0644	edit dl rm
inspect.py	118235	0644	edit dl rm
io.py	3541	0644	edit dl rm
ipaddress.py	80924	0644	edit dl rm
keyword.py	1047	0644	edit dl rm
LICENSE.txt	13937	0644	edit dl rm
linecache.py	5461	0644	edit dl rm
locale.py	78271	0644	edit dl rm
lzma.py	13231	0644	edit dl rm
mailbox.py	78794	0644	edit dl rm
mailcap.py	9116	0644	edit dl rm
mimetypes.py	21564	0644	edit dl rm
modulefinder.py	24401	0644	edit dl rm
netrc.py	5566	0644	edit dl rm
nntplib.py	41023	0644	edit dl rm
ntpath.py	26460	0644	edit dl rm
nturl2path.py	2887	0644	edit dl rm
numbers.py	10338	0644	edit dl rm
opcode.py	5660	0644	edit dl rm
operator.py	10751	0644	edit dl rm
optparse.py	60369	0644	edit dl rm
os.py	39065	0644	edit dl rm
pathlib.py	51134	0644	edit dl rm
pdb.py	63237	0755	edit dl rm
pickle.py	64920	0644	edit dl rm
pickletools.py	93486	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	24276	0644	edit dl rm
platform.py	40601	0755	edit dl rm
plistlib.py	28248	0644	edit dl rm
poplib.py	15198	0644	edit dl rm
posixpath.py	16146	0644	edit dl rm
pprint.py	22527	0644	edit dl rm
profile.py	22881	0755	edit dl rm
pstats.py	29326	0644	edit dl rm
pty.py	4807	0644	edit dl rm
pyclbr.py	15255	0644	edit dl rm
pydoc.py	109599	0755	edit dl rm
py_compile.py	8203	0644	edit dl rm
queue.py	11496	0644	edit dl rm
quopri.py	7266	0755	edit dl rm
random.py	31484	0644	edit dl rm
re.py	15861	0644	edit dl rm
reprlib.py	5267	0644	edit dl rm
rlcompleter.py	7648	0644	edit dl rm
runpy.py	13084	0644	edit dl rm
sched.py	6442	0644	edit dl rm
secrets.py	2036	0644	edit dl rm
selectors.py	19536	0644	edit dl rm
shelve.py	8527	0644	edit dl rm
shlex.py	13501	0644	edit dl rm
shutil.py	53030	0644	edit dl rm
signal.py	2438	0644	edit dl rm
site.py	22085	0644	edit dl rm
smtpd.py	34821	0755	edit dl rm
smtplib.py	45405	0755	edit dl rm
sndhdr.py	7099	0644	edit dl rm
socket.py	36915	0644	edit dl rm
socketserver.py	27296	0644	edit dl rm
sre_compile.py	27973	0644	edit dl rm
sre_constants.py	7177	0644	edit dl rm
sre_parse.py	40779	0644	edit dl rm
ssl.py	52622	0644	edit dl rm
stat.py	5485	0644	edit dl rm
statistics.py	38067	0644	edit dl rm
string.py	10566	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	83564	0644	edit dl rm
sunau.py	18158	0644	edit dl rm
symbol.py	2281	0644	edit dl rm
symtable.py	7905	0644	edit dl rm
sysconfig.py	25557	0644	edit dl rm
tabnanny.py	11406	0755	edit dl rm
tarfile.py	112939	0755	edit dl rm
telnetlib.py	23254	0644	edit dl rm
tempfile.py	27963	0644	edit dl rm
textwrap.py	19407	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	54176	0644	edit dl rm
timeit.py	13480	0755	edit dl rm
token.py	2368	0644	edit dl rm
tokenize.py	25883	0644	edit dl rm
trace.py	29207	0755	edit dl rm
traceback.py	24660	0644	edit dl rm
tracemalloc.py	18047	0644	edit dl rm
tty.py	879	0644	edit dl rm
types.py	9785	0644	edit dl rm
typing.py	77044	0644	edit dl rm
uu.py	7277	0644	edit dl rm
uuid.py	27324	0644	edit dl rm
warnings.py	19688	0644	edit dl rm
wave.py	18004	0644	edit dl rm
weakref.py	21560	0644	edit dl rm
webbrowser.py	24083	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7535	0644	edit dl rm
zipfile.py	88899	0644	edit dl rm
zipimport.py	30765	0644	edit dl rm
_aix_support.py	3389	0644	edit dl rm
_bootlocale.py	1801	0644	edit dl rm
_bootsubprocess.py	2675	0644	edit dl rm
_collections_abc.py	29374	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_markupbase.py	14623	0644	edit dl rm
_osx_support.py	21773	0644	edit dl rm
_pydecimal.py	228666	0644	edit dl rm
_pyio.py	93316	0644	edit dl rm
_py_abc.py	6189	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	25277	0644	edit dl rm
_sysconfigdata__linux_x86_64-linux-gnu.py	41236	0644	edit dl rm
_threading_local.py	7220	0644	edit dl rm
_weakrefset.py	5923	0644	edit dl rm
__future__.py	5147	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /usr/lib64/python3.9/smtpd.py (34821B)

#! /usr/bin/python3.9
"""An RFC 5321 smtp proxy with optional RFC 1870 and RFC 6531 extensions.

Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]]

Options:

--nosetuid
    -n
        This program generally tries to setuid `nobody', unless this flag is
        set.  The setuid call will fail if this program is not run as root (in
        which case, use this flag).

--version
    -V
        Print the version number and exit.

--class classname
    -c classname
        Use `classname' as the concrete SMTP proxy class.  Uses `PureProxy' by
        default.

--size limit
    -s limit
        Restrict the total size of the incoming message to "limit" number of
        bytes via the RFC 1870 SIZE extension.  Defaults to 33554432 bytes.

--smtputf8
    -u
        Enable the SMTPUTF8 extension and behave as an RFC 6531 smtp proxy.

--debug
    -d
        Turn on debugging prints.

--help
    -h
        Print this message and exit.

Version: %(__version__)s

If localhost is not given then `localhost' is used, and if localport is not
given then 8025 is used.  If remotehost is not given then `localhost' is used,
and if remoteport is not given, then 25 is used.
"""

# Overview:
#
# This file implements the minimal SMTP protocol as defined in RFC 5321.  It
# has a hierarchy of classes which implement the backend functionality for the
# smtpd.  A number of classes are provided:
#
#   SMTPServer - the base class for the backend.  Raises NotImplementedError
#   if you try to use it.
#
#   DebuggingServer - simply prints each message it receives on stdout.
#
#   PureProxy - Proxies all messages to a real smtpd which does final
#   delivery.  One known problem with this class is that it doesn't handle
#   SMTP errors from the backend server at all.  This should be fixed
#   (contributions are welcome!).
#
#   MailmanProxy - An experimental hack to work with GNU Mailman
#   <www.list.org>.  Using this server as your real incoming smtpd, your
#   mailhost will automatically recognize and accept mail destined to Mailman
#   lists when those lists are created.  Every message not destined for a list
#   gets forwarded to a real backend smtpd, as with PureProxy.  Again, errors
#   are not handled correctly yet.
#
#
# Author: Barry Warsaw <barry@python.org>
#
# TODO:
#
# - support mailbox delivery
# - alias files
# - Handle more ESMTP extensions
# - handle error codes from the backend smtpd

import sys
import os
import errno
import getopt
import time
import socket
import asyncore
import asynchat
import collections
from warnings import warn
from email._header_value_parser import get_addr_spec, get_angle_addr

__all__ = [
    "SMTPChannel", "SMTPServer", "DebuggingServer", "PureProxy",
    "MailmanProxy",
]

program = sys.argv[0]
__version__ = 'Python SMTP proxy version 0.3'

class Devnull:
    def write(self, msg): pass
    def flush(self): pass

DEBUGSTREAM = Devnull()
NEWLINE = '\n'
COMMASPACE = ', '
DATA_SIZE_DEFAULT = 33554432

def usage(code, msg=''):
    print(__doc__ % globals(), file=sys.stderr)
    if msg:
        print(msg, file=sys.stderr)
    sys.exit(code)

class SMTPChannel(asynchat.async_chat):
    COMMAND = 0
    DATA = 1

command_size_limit = 512
    command_size_limits = collections.defaultdict(lambda x=command_size_limit: x)

@property
    def max_command_size_limit(self):
        try:
            return max(self.command_size_limits.values())
        except ValueError:
            return self.command_size_limit

def __init__(self, server, conn, addr, data_size_limit=DATA_SIZE_DEFAULT,
                 map=None, enable_SMTPUTF8=False, decode_data=False):
        asynchat.async_chat.__init__(self, conn, map=map)
        self.smtp_server = server
        self.conn = conn
        self.addr = addr
        self.data_size_limit = data_size_limit
        self.enable_SMTPUTF8 = enable_SMTPUTF8
        self._decode_data = decode_data
        if enable_SMTPUTF8 and decode_data:
            raise ValueError("decode_data and enable_SMTPUTF8 cannot"
                             " be set to True at the same time")
        if decode_data:
            self._emptystring = ''
            self._linesep = '\r\n'
            self._dotsep = '.'
            self._newline = NEWLINE
        else:
            self._emptystring = b''
            self._linesep = b'\r\n'
            self._dotsep = ord(b'.')
            self._newline = b'\n'
        self._set_rset_state()
        self.seen_greeting = ''
        self.extended_smtp = False
        self.command_size_limits.clear()
        self.fqdn = socket.getfqdn()
        try:
            self.peer = conn.getpeername()
        except OSError as err:
            # a race condition  may occur if the other end is closing
            # before we can get the peername
            self.close()
            if err.args[0] != errno.ENOTCONN:
                raise
            return
        print('Peer:', repr(self.peer), file=DEBUGSTREAM)
        self.push('220 %s %s' % (self.fqdn, __version__))

def _set_post_data_state(self):
        """Reset state variables to their post-DATA state."""
        self.smtp_state = self.COMMAND
        self.mailfrom = None
        self.rcpttos = []
        self.require_SMTPUTF8 = False
        self.num_bytes = 0
        self.set_terminator(b'\r\n')

def _set_rset_state(self):
        """Reset all state variables except the greeting."""
        self._set_post_data_state()
        self.received_data = ''
        self.received_lines = []

# properties for backwards-compatibility
    @property
    def __server(self):
        warn("Access to __server attribute on SMTPChannel is deprecated, "
            "use 'smtp_server' instead", DeprecationWarning, 2)
        return self.smtp_server
    @__server.setter
    def __server(self, value):
        warn("Setting __server attribute on SMTPChannel is deprecated, "
            "set 'smtp_server' instead", DeprecationWarning, 2)
        self.smtp_server = value

@property
    def __line(self):
        warn("Access to __line attribute on SMTPChannel is deprecated, "
            "use 'received_lines' instead", DeprecationWarning, 2)
        return self.received_lines
    @__line.setter
    def __line(self, value):
        warn("Setting __line attribute on SMTPChannel is deprecated, "
            "set 'received_lines' instead", DeprecationWarning, 2)
        self.received_lines = value

@property
    def __state(self):
        warn("Access to __state attribute on SMTPChannel is deprecated, "
            "use 'smtp_state' instead", DeprecationWarning, 2)
        return self.smtp_state
    @__state.setter
    def __state(self, value):
        warn("Setting __state attribute on SMTPChannel is deprecated, "
            "set 'smtp_state' instead", DeprecationWarning, 2)
        self.smtp_state = value

@property
    def __greeting(self):
        warn("Access to __greeting attribute on SMTPChannel is deprecated, "
            "use 'seen_greeting' instead", DeprecationWarning, 2)
        return self.seen_greeting
    @__greeting.setter
    def __greeting(self, value):
        warn("Setting __greeting attribute on SMTPChannel is deprecated, "
            "set 'seen_greeting' instead", DeprecationWarning, 2)
        self.seen_greeting = value

@property
    def __mailfrom(self):
        warn("Access to __mailfrom attribute on SMTPChannel is deprecated, "
            "use 'mailfrom' instead", DeprecationWarning, 2)
        return self.mailfrom
    @__mailfrom.setter
    def __mailfrom(self, value):
        warn("Setting __mailfrom attribute on SMTPChannel is deprecated, "
            "set 'mailfrom' instead", DeprecationWarning, 2)
        self.mailfrom = value

@property
    def __rcpttos(self):
        warn("Access to __rcpttos attribute on SMTPChannel is deprecated, "
            "use 'rcpttos' instead", DeprecationWarning, 2)
        return self.rcpttos
    @__rcpttos.setter
    def __rcpttos(self, value):
        warn("Setting __rcpttos attribute on SMTPChannel is deprecated, "
            "set 'rcpttos' instead", DeprecationWarning, 2)
        self.rcpttos = value

@property
    def __data(self):
        warn("Access to __data attribute on SMTPChannel is deprecated, "
            "use 'received_data' instead", DeprecationWarning, 2)
        return self.received_data
    @__data.setter
    def __data(self, value):
        warn("Setting __data attribute on SMTPChannel is deprecated, "
            "set 'received_data' instead", DeprecationWarning, 2)
        self.received_data = value

@property
    def __fqdn(self):
        warn("Access to __fqdn attribute on SMTPChannel is deprecated, "
            "use 'fqdn' instead", DeprecationWarning, 2)
        return self.fqdn
    @__fqdn.setter
    def __fqdn(self, value):
        warn("Setting __fqdn attribute on SMTPChannel is deprecated, "
            "set 'fqdn' instead", DeprecationWarning, 2)
        self.fqdn = value

@property
    def __peer(self):
        warn("Access to __peer attribute on SMTPChannel is deprecated, "
            "use 'peer' instead", DeprecationWarning, 2)
        return self.peer
    @__peer.setter
    def __peer(self, value):
        warn("Setting __peer attribute on SMTPChannel is deprecated, "
            "set 'peer' instead", DeprecationWarning, 2)
        self.peer = value

@property
    def __conn(self):
        warn("Access to __conn attribute on SMTPChannel is deprecated, "
            "use 'conn' instead", DeprecationWarning, 2)
        return self.conn
    @__conn.setter
    def __conn(self, value):
        warn("Setting __conn attribute on SMTPChannel is deprecated, "
            "set 'conn' instead", DeprecationWarning, 2)
        self.conn = value

@property
    def __addr(self):
        warn("Access to __addr attribute on SMTPChannel is deprecated, "
            "use 'addr' instead", DeprecationWarning, 2)
        return self.addr
    @__addr.setter
    def __addr(self, value):
        warn("Setting __addr attribute on SMTPChannel is deprecated, "
            "set 'addr' instead", DeprecationWarning, 2)
        self.addr = value

# Overrides base class for convenience.
    def push(self, msg):
        asynchat.async_chat.push(self, bytes(
            msg + '\r\n', 'utf-8' if self.require_SMTPUTF8 else 'ascii'))

# Implementation of base class abstract method
    def collect_incoming_data(self, data):
        limit = None
        if self.smtp_state == self.COMMAND:
            limit = self.max_command_size_limit
        elif self.smtp_state == self.DATA:
            limit = self.data_size_limit
        if limit and self.num_bytes > limit:
            return
        elif limit:
            self.num_bytes += len(data)
        if self._decode_data:
            self.received_lines.append(str(data, 'utf-8'))
        else:
            self.received_lines.append(data)

# Implementation of base class abstract method
    def found_terminator(self):
        line = self._emptystring.join(self.received_lines)
        print('Data:', repr(line), file=DEBUGSTREAM)
        self.received_lines = []
        if self.smtp_state == self.COMMAND:
            sz, self.num_bytes = self.num_bytes, 0
            if not line:
                self.push('500 Error: bad syntax')
                return
            if not self._decode_data:
                line = str(line, 'utf-8')
            i = line.find(' ')
            if i < 0:
                command = line.upper()
                arg = None
            else:
                command = line[:i].upper()
                arg = line[i+1:].strip()
            max_sz = (self.command_size_limits[command]
                        if self.extended_smtp else self.command_size_limit)
            if sz > max_sz:
                self.push('500 Error: line too long')
                return
            method = getattr(self, 'smtp_' + command, None)
            if not method:
                self.push('500 Error: command "%s" not recognized' % command)
                return
            method(arg)
            return
        else:
            if self.smtp_state != self.DATA:
                self.push('451 Internal confusion')
                self.num_bytes = 0
                return
            if self.data_size_limit and self.num_bytes > self.data_size_limit:
                self.push('552 Error: Too much mail data')
                self.num_bytes = 0
                return
            # Remove extraneous carriage returns and de-transparency according
            # to RFC 5321, Section 4.5.2.
            data = []
            for text in line.split(self._linesep):
                if text and text[0] == self._dotsep:
                    data.append(text[1:])
                else:
                    data.append(text)
            self.received_data = self._newline.join(data)
            args = (self.peer, self.mailfrom, self.rcpttos, self.received_data)
            kwargs = {}
            if not self._decode_data:
                kwargs = {
                    'mail_options': self.mail_options,
                    'rcpt_options': self.rcpt_options,
                }
            status = self.smtp_server.process_message(*args, **kwargs)
            self._set_post_data_state()
            if not status:
                self.push('250 OK')
            else:
                self.push(status)

# SMTP and ESMTP commands
    def smtp_HELO(self, arg):
        if not arg:
            self.push('501 Syntax: HELO hostname')
            return
        # See issue #21783 for a discussion of this behavior.
        if self.seen_greeting:
            self.push('503 Duplicate HELO/EHLO')
            return
        self._set_rset_state()
        self.seen_greeting = arg
        self.push('250 %s' % self.fqdn)

def smtp_EHLO(self, arg):
        if not arg:
            self.push('501 Syntax: EHLO hostname')
            return
        # See issue #21783 for a discussion of this behavior.
        if self.seen_greeting:
            self.push('503 Duplicate HELO/EHLO')
            return
        self._set_rset_state()
        self.seen_greeting = arg
        self.extended_smtp = True
        self.push('250-%s' % self.fqdn)
        if self.data_size_limit:
            self.push('250-SIZE %s' % self.data_size_limit)
            self.command_size_limits['MAIL'] += 26
        if not self._decode_data:
            self.push('250-8BITMIME')
        if self.enable_SMTPUTF8:
            self.push('250-SMTPUTF8')
            self.command_size_limits['MAIL'] += 10
        self.push('250 HELP')

def smtp_NOOP(self, arg):
        if arg:
            self.push('501 Syntax: NOOP')
        else:
            self.push('250 OK')

def smtp_QUIT(self, arg):
        # args is ignored
        self.push('221 Bye')
        self.close_when_done()

def _strip_command_keyword(self, keyword, arg):
        keylen = len(keyword)
        if arg[:keylen].upper() == keyword:
            return arg[keylen:].strip()
        return ''

def _getaddr(self, arg):
        if not arg:
            return '', ''
        if arg.lstrip().startswith('<'):
            address, rest = get_angle_addr(arg)
        else:
            address, rest = get_addr_spec(arg)
        if not address:
            return address, rest
        return address.addr_spec, rest

def _getparams(self, params):
        # Return params as dictionary. Return None if not all parameters
        # appear to be syntactically valid according to RFC 1869.
        result = {}
        for param in params:
            param, eq, value = param.partition('=')
            if not param.isalnum() or eq and not value:
                return None
            result[param] = value if eq else True
        return result

def smtp_HELP(self, arg):
        if arg:
            extended = ' [SP <mail-parameters>]'
            lc_arg = arg.upper()
            if lc_arg == 'EHLO':
                self.push('250 Syntax: EHLO hostname')
            elif lc_arg == 'HELO':
                self.push('250 Syntax: HELO hostname')
            elif lc_arg == 'MAIL':
                msg = '250 Syntax: MAIL FROM: <address>'
                if self.extended_smtp:
                    msg += extended
                self.push(msg)
            elif lc_arg == 'RCPT':
                msg = '250 Syntax: RCPT TO: <address>'
                if self.extended_smtp:
                    msg += extended
                self.push(msg)
            elif lc_arg == 'DATA':
                self.push('250 Syntax: DATA')
            elif lc_arg == 'RSET':
                self.push('250 Syntax: RSET')
            elif lc_arg == 'NOOP':
                self.push('250 Syntax: NOOP')
            elif lc_arg == 'QUIT':
                self.push('250 Syntax: QUIT')
            elif lc_arg == 'VRFY':
                self.push('250 Syntax: VRFY <address>')
            else:
                self.push('501 Supported commands: EHLO HELO MAIL RCPT '
                          'DATA RSET NOOP QUIT VRFY')
        else:
            self.push('250 Supported commands: EHLO HELO MAIL RCPT DATA '
                      'RSET NOOP QUIT VRFY')

def smtp_VRFY(self, arg):
        if arg:
            address, params = self._getaddr(arg)
            if address:
                self.push('252 Cannot VRFY user, but will accept message '
                          'and attempt delivery')
            else:
                self.push('502 Could not VRFY %s' % arg)
        else:
            self.push('501 Syntax: VRFY <address>')

def smtp_MAIL(self, arg):
        if not self.seen_greeting:
            self.push('503 Error: send HELO first')
            return
        print('===> MAIL', arg, file=DEBUGSTREAM)
        syntaxerr = '501 Syntax: MAIL FROM: <address>'
        if self.extended_smtp:
            syntaxerr += ' [SP <mail-parameters>]'
        if arg is None:
            self.push(syntaxerr)
            return
        arg = self._strip_command_keyword('FROM:', arg)
        address, params = self._getaddr(arg)
        if not address:
            self.push(syntaxerr)
            return
        if not self.extended_smtp and params:
            self.push(syntaxerr)
            return
        if self.mailfrom:
            self.push('503 Error: nested MAIL command')
            return
        self.mail_options = params.upper().split()
        params = self._getparams(self.mail_options)
        if params is None:
            self.push(syntaxerr)
            return
        if not self._decode_data:
            body = params.pop('BODY', '7BIT')
            if body not in ['7BIT', '8BITMIME']:
                self.push('501 Error: BODY can only be one of 7BIT, 8BITMIME')
                return
        if self.enable_SMTPUTF8:
            smtputf8 = params.pop('SMTPUTF8', False)
            if smtputf8 is True:
                self.require_SMTPUTF8 = True
            elif smtputf8 is not False:
                self.push('501 Error: SMTPUTF8 takes no arguments')
                return
        size = params.pop('SIZE', None)
        if size:
            if not size.isdigit():
                self.push(syntaxerr)
                return
            elif self.data_size_limit and int(size) > self.data_size_limit:
                self.push('552 Error: message size exceeds fixed maximum message size')
                return
        if len(params.keys()) > 0:
            self.push('555 MAIL FROM parameters not recognized or not implemented')
            return
        self.mailfrom = address
        print('sender:', self.mailfrom, file=DEBUGSTREAM)
        self.push('250 OK')

def smtp_RCPT(self, arg):
        if not self.seen_greeting:
            self.push('503 Error: send HELO first');
            return
        print('===> RCPT', arg, file=DEBUGSTREAM)
        if not self.mailfrom:
            self.push('503 Error: need MAIL command')
            return
        syntaxerr = '501 Syntax: RCPT TO: <address>'
        if self.extended_smtp:
            syntaxerr += ' [SP <mail-parameters>]'
        if arg is None:
            self.push(syntaxerr)
            return
        arg = self._strip_command_keyword('TO:', arg)
        address, params = self._getaddr(arg)
        if not address:
            self.push(syntaxerr)
            return
        if not self.extended_smtp and params:
            self.push(syntaxerr)
            return
        self.rcpt_options = params.upper().split()
        params = self._getparams(self.rcpt_options)
        if params is None:
            self.push(syntaxerr)
            return
        # XXX currently there are no options we recognize.
        if len(params.keys()) > 0:
            self.push('555 RCPT TO parameters not recognized or not implemented')
            return
        self.rcpttos.append(address)
        print('recips:', self.rcpttos, file=DEBUGSTREAM)
        self.push('250 OK')

def smtp_RSET(self, arg):
        if arg:
            self.push('501 Syntax: RSET')
            return
        self._set_rset_state()
        self.push('250 OK')

def smtp_DATA(self, arg):
        if not self.seen_greeting:
            self.push('503 Error: send HELO first');
            return
        if not self.rcpttos:
            self.push('503 Error: need RCPT command')
            return
        if arg:
            self.push('501 Syntax: DATA')
            return
        self.smtp_state = self.DATA
        self.set_terminator(b'\r\n.\r\n')
        self.push('354 End data with <CR><LF>.<CR><LF>')

# Commands that have not been implemented
    def smtp_EXPN(self, arg):
        self.push('502 EXPN not implemented')

class SMTPServer(asyncore.dispatcher):
    # SMTPChannel class to use for managing client connections
    channel_class = SMTPChannel

def __init__(self, localaddr, remoteaddr,
                 data_size_limit=DATA_SIZE_DEFAULT, map=None,
                 enable_SMTPUTF8=False, decode_data=False):
        self._localaddr = localaddr
        self._remoteaddr = remoteaddr
        self.data_size_limit = data_size_limit
        self.enable_SMTPUTF8 = enable_SMTPUTF8
        self._decode_data = decode_data
        if enable_SMTPUTF8 and decode_data:
            raise ValueError("decode_data and enable_SMTPUTF8 cannot"
                             " be set to True at the same time")
        asyncore.dispatcher.__init__(self, map=map)
        try:
            gai_results = socket.getaddrinfo(*localaddr,
                                             type=socket.SOCK_STREAM)
            self.create_socket(gai_results[0][0], gai_results[0][1])
            # try to re-use a server port if possible
            self.set_reuse_addr()
            self.bind(localaddr)
            self.listen(5)
        except:
            self.close()
            raise
        else:
            print('%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % (
                self.__class__.__name__, time.ctime(time.time()),
                localaddr, remoteaddr), file=DEBUGSTREAM)

def handle_accepted(self, conn, addr):
        print('Incoming connection from %s' % repr(addr), file=DEBUGSTREAM)
        channel = self.channel_class(self,
                                     conn,
                                     addr,
                                     self.data_size_limit,
                                     self._map,
                                     self.enable_SMTPUTF8,
                                     self._decode_data)

# API for "doing something useful with the message"
    def process_message(self, peer, mailfrom, rcpttos, data, **kwargs):
        """Override this abstract method to handle messages from the client.

peer is a tuple containing (ipaddr, port) of the client that made the
        socket connection to our smtp port.

mailfrom is the raw address the client claims the message is coming
        from.

rcpttos is a list of raw addresses the client wishes to deliver the
        message to.

data is a string containing the entire full text of the message,
        headers (if supplied) and all.  It has been `de-transparencied'
        according to RFC 821, Section 4.5.2.  In other words, a line
        containing a `.' followed by other text has had the leading dot
        removed.

kwargs is a dictionary containing additional information.  It is
        empty if decode_data=True was given as init parameter, otherwise
        it will contain the following keys:
            'mail_options': list of parameters to the mail command.  All
                            elements are uppercase strings.  Example:
                            ['BODY=8BITMIME', 'SMTPUTF8'].
            'rcpt_options': same, for the rcpt command.

This function should return None for a normal `250 Ok' response;
        otherwise, it should return the desired response string in RFC 821
        format.

"""
        raise NotImplementedError

class DebuggingServer(SMTPServer):

def _print_message_content(self, peer, data):
        inheaders = 1
        lines = data.splitlines()
        for line in lines:
            # headers first
            if inheaders and not line:
                peerheader = 'X-Peer: ' + peer[0]
                if not isinstance(data, str):
                    # decoded_data=false; make header match other binary output
                    peerheader = repr(peerheader.encode('utf-8'))
                print(peerheader)
                inheaders = 0
            if not isinstance(data, str):
                # Avoid spurious 'str on bytes instance' warning.
                line = repr(line)
            print(line)

def process_message(self, peer, mailfrom, rcpttos, data, **kwargs):
        print('---------- MESSAGE FOLLOWS ----------')
        if kwargs:
            if kwargs.get('mail_options'):
                print('mail options: %s' % kwargs['mail_options'])
            if kwargs.get('rcpt_options'):
                print('rcpt options: %s\n' % kwargs['rcpt_options'])
        self._print_message_content(peer, data)
        print('------------ END MESSAGE ------------')

class PureProxy(SMTPServer):
    def __init__(self, *args, **kwargs):
        if 'enable_SMTPUTF8' in kwargs and kwargs['enable_SMTPUTF8']:
            raise ValueError("PureProxy does not support SMTPUTF8.")
        super(PureProxy, self).__init__(*args, **kwargs)

def process_message(self, peer, mailfrom, rcpttos, data):
        lines = data.split('\n')
        # Look for the last header
        i = 0
        for line in lines:
            if not line:
                break
            i += 1
        lines.insert(i, 'X-Peer: %s' % peer[0])
        data = NEWLINE.join(lines)
        refused = self._deliver(mailfrom, rcpttos, data)
        # TBD: what to do with refused addresses?
        print('we got some refusals:', refused, file=DEBUGSTREAM)

def _deliver(self, mailfrom, rcpttos, data):
        import smtplib
        refused = {}
        try:
            s = smtplib.SMTP()
            s.connect(self._remoteaddr[0], self._remoteaddr[1])
            try:
                refused = s.sendmail(mailfrom, rcpttos, data)
            finally:
                s.quit()
        except smtplib.SMTPRecipientsRefused as e:
            print('got SMTPRecipientsRefused', file=DEBUGSTREAM)
            refused = e.recipients
        except (OSError, smtplib.SMTPException) as e:
            print('got', e.__class__, file=DEBUGSTREAM)
            # All recipients were refused.  If the exception had an associated
            # error code, use it.  Otherwise,fake it with a non-triggering
            # exception code.
            errcode = getattr(e, 'smtp_code', -1)
            errmsg = getattr(e, 'smtp_error', 'ignore')
            for r in rcpttos:
                refused[r] = (errcode, errmsg)
        return refused

class MailmanProxy(PureProxy):
    def __init__(self, *args, **kwargs):
        warn('MailmanProxy is deprecated and will be removed '
             'in future', DeprecationWarning, 2)
        if 'enable_SMTPUTF8' in kwargs and kwargs['enable_SMTPUTF8']:
            raise ValueError("MailmanProxy does not support SMTPUTF8.")
        super(PureProxy, self).__init__(*args, **kwargs)

def process_message(self, peer, mailfrom, rcpttos, data):
        from io import StringIO
        from Mailman import Utils
        from Mailman import Message
        from Mailman import MailList
        # If the message is to a Mailman mailing list, then we'll invoke the
        # Mailman script directly, without going through the real smtpd.
        # Otherwise we'll forward it to the local proxy for disposition.
        listnames = []
        for rcpt in rcpttos:
            local = rcpt.lower().split('@')[0]
            # We allow the following variations on the theme
            #   listname
            #   listname-admin
            #   listname-owner
            #   listname-request
            #   listname-join
            #   listname-leave
            parts = local.split('-')
            if len(parts) > 2:
                continue
            listname = parts[0]
            if len(parts) == 2:
                command = parts[1]
            else:
                command = ''
            if not Utils.list_exists(listname) or command not in (
                    '', 'admin', 'owner', 'request', 'join', 'leave'):
                continue
            listnames.append((rcpt, listname, command))
        # Remove all list recipients from rcpttos and forward what we're not
        # going to take care of ourselves.  Linear removal should be fine
        # since we don't expect a large number of recipients.
        for rcpt, listname, command in listnames:
            rcpttos.remove(rcpt)
        # If there's any non-list destined recipients left,
        print('forwarding recips:', ' '.join(rcpttos), file=DEBUGSTREAM)
        if rcpttos:
            refused = self._deliver(mailfrom, rcpttos, data)
            # TBD: what to do with refused addresses?
            print('we got refusals:', refused, file=DEBUGSTREAM)
        # Now deliver directly to the list commands
        mlists = {}
        s = StringIO(data)
        msg = Message.Message(s)
        # These headers are required for the proper execution of Mailman.  All
        # MTAs in existence seem to add these if the original message doesn't
        # have them.
        if not msg.get('from'):
            msg['From'] = mailfrom
        if not msg.get('date'):
            msg['Date'] = time.ctime(time.time())
        for rcpt, listname, command in listnames:
            print('sending message to', rcpt, file=DEBUGSTREAM)
            mlist = mlists.get(listname)
            if not mlist:
                mlist = MailList.MailList(listname, lock=0)
                mlists[listname] = mlist
            # dispatch on the type of command
            if command == '':
                # post
                msg.Enqueue(mlist, tolist=1)
            elif command == 'admin':
                msg.Enqueue(mlist, toadmin=1)
            elif command == 'owner':
                msg.Enqueue(mlist, toowner=1)
            elif command == 'request':
                msg.Enqueue(mlist, torequest=1)
            elif command in ('join', 'leave'):
                # TBD: this is a hack!
                if command == 'join':
                    msg['Subject'] = 'subscribe'
                else:
                    msg['Subject'] = 'unsubscribe'
                msg.Enqueue(mlist, torequest=1)

class Options:
    setuid = True
    classname = 'PureProxy'
    size_limit = None
    enable_SMTPUTF8 = False

def parseargs():
    global DEBUGSTREAM
    try:
        opts, args = getopt.getopt(
            sys.argv[1:], 'nVhc:s:du',
            ['class=', 'nosetuid', 'version', 'help', 'size=', 'debug',
             'smtputf8'])
    except getopt.error as e:
        usage(1, e)

options = Options()
    for opt, arg in opts:
        if opt in ('-h', '--help'):
            usage(0)
        elif opt in ('-V', '--version'):
            print(__version__)
            sys.exit(0)
        elif opt in ('-n', '--nosetuid'):
            options.setuid = False
        elif opt in ('-c', '--class'):
            options.classname = arg
        elif opt in ('-d', '--debug'):
            DEBUGSTREAM = sys.stderr
        elif opt in ('-u', '--smtputf8'):
            options.enable_SMTPUTF8 = True
        elif opt in ('-s', '--size'):
            try:
                int_size = int(arg)
                options.size_limit = int_size
            except:
                print('Invalid size: ' + arg, file=sys.stderr)
                sys.exit(1)

# parse the rest of the arguments
    if len(args) < 1:
        localspec = 'localhost:8025'
        remotespec = 'localhost:25'
    elif len(args) < 2:
        localspec = args[0]
        remotespec = 'localhost:25'
    elif len(args) < 3:
        localspec = args[0]
        remotespec = args[1]
    else:
        usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args))

# split into host/port pairs
    i = localspec.find(':')
    if i < 0:
        usage(1, 'Bad local spec: %s' % localspec)
    options.localhost = localspec[:i]
    try:
        options.localport = int(localspec[i+1:])
    except ValueError:
        usage(1, 'Bad local port: %s' % localspec)
    i = remotespec.find(':')
    if i < 0:
        usage(1, 'Bad remote spec: %s' % remotespec)
    options.remotehost = remotespec[:i]
    try:
        options.remoteport = int(remotespec[i+1:])
    except ValueError:
        usage(1, 'Bad remote port: %s' % remotespec)
    return options

if __name__ == '__main__':
    options = parseargs()
    # Become nobody
    classname = options.classname
    if "." in classname:
        lastdot = classname.rfind(".")
        mod = __import__(classname[:lastdot], globals(), locals(), [""])
        classname = classname[lastdot+1:]
    else:
        import __main__ as mod
    class_ = getattr(mod, classname)
    proxy = class_((options.localhost, options.localport),
                   (options.remotehost, options.remoteport),
                   options.size_limit, enable_SMTPUTF8=options.enable_SMTPUTF8)
    if options.setuid:
        try:
            import pwd
        except ImportError:
            print('Cannot import module "pwd"; try running with -n option.', file=sys.stderr)
            sys.exit(1)
        nobody = pwd.getpwnam('nobody')[2]
        try:
            os.setuid(nobody)
        except PermissionError:
            print('Cannot setuid "nobody"; try running with -n option.', file=sys.stderr)
            sys.exit(1)
    try:
        asyncore.loop()
    except KeyboardInterrupt:
        pass

cmd: