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import asyncore
import email.utils
import socket
import smtpd
import smtplib
import StringIO
import sys
import time
import select
import unittest
from test import test_support
try:
import threading
except ImportError:
threading = None
HOST = test_support.HOST
def server(evt, buf, serv):
serv.listen(5)
evt.set()
try:
conn, addr = serv.accept()
except socket.timeout:
pass
else:
n = 500
while buf and n > 0:
r, w, e = select.select([], [conn], [])
if w:
sent = conn.send(buf)
buf = buf[sent:]
n -= 1
conn.close()
finally:
serv.close()
evt.set()
@unittest.skipUnless(threading, 'Threading required for this test.')
class GeneralTests(unittest.TestCase):
def setUp(self):
self._threads = test_support.threading_setup()
self.evt = threading.Event()
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(15)
self.port = test_support.bind_port(self.sock)
servargs = (self.evt, "220 Hola mundo\n", self.sock)
self.thread = threading.Thread(target=server, args=servargs)
self.thread.start()
self.evt.wait()
self.evt.clear()
def tearDown(self):
self.evt.wait()
self.thread.join()
test_support.threading_cleanup(*self._threads)
def testBasic1(self):
# connects
smtp = smtplib.SMTP(HOST, self.port)
smtp.close()
def testBasic2(self):
# connects, include port in host name
smtp = smtplib.SMTP("%s:%s" % (HOST, self.port))
smtp.close()
def testLocalHostName(self):
# check that supplied local_hostname is used
smtp = smtplib.SMTP(HOST, self.port, local_hostname="testhost")
self.assertEqual(smtp.local_hostname, "testhost")
smtp.close()
def testTimeoutDefault(self):
self.assertTrue(socket.getdefaulttimeout() is None)
socket.setdefaulttimeout(30)
try:
smtp = smtplib.SMTP(HOST, self.port)
finally:
socket.setdefaulttimeout(None)
self.assertEqual(smtp.sock.gettimeout(), 30)
smtp.close()
def testTimeoutNone(self):
self.assertTrue(socket.getdefaulttimeout() is None)
socket.setdefaulttimeout(30)
try:
smtp = smtplib.SMTP(HOST, self.port, timeout=None)
finally:
socket.setdefaulttimeout(None)
self.assertTrue(smtp.sock.gettimeout() is None)
smtp.close()
def testTimeoutValue(self):
smtp = smtplib.SMTP(HOST, self.port, timeout=30)
self.assertEqual(smtp.sock.gettimeout(), 30)
smtp.close()
# Test server thread using the specified SMTP server class
def debugging_server(serv, serv_evt, client_evt):
serv_evt.set()
try:
if hasattr(select, 'poll'):
poll_fun = asyncore.poll2
else:
poll_fun = asyncore.poll
n = 1000
while asyncore.socket_map and n > 0:
poll_fun(0.01, asyncore.socket_map)
# when the client conversation is finished, it will
# set client_evt, and it's then ok to kill the server
if client_evt.is_set():
serv.close()
break
n -= 1
except socket.timeout:
pass
finally:
if not client_evt.is_set():
# allow some time for the client to read the result
time.sleep(0.5)
serv.close()
asyncore.close_all()
serv_evt.set()
MSG_BEGIN = '---------- MESSAGE FOLLOWS ----------\n'
MSG_END = '------------ END MESSAGE ------------\n'
# NOTE: Some SMTP objects in the tests below are created with a non-default
# local_hostname argument to the constructor, since (on some systems) the FQDN
# lookup caused by the default local_hostname sometimes takes so long that the
# test server times out, causing the test to fail.
# Test behavior of smtpd.DebuggingServer
@unittest.skipUnless(threading, 'Threading required for this test.')
class DebuggingServerTests(unittest.TestCase):
def setUp(self):
# temporarily replace sys.stdout to capture DebuggingServer output
self.old_stdout = sys.stdout
self.output = StringIO.StringIO()
sys.stdout = self.output
self._threads = test_support.threading_setup()
self.serv_evt = threading.Event()
self.client_evt = threading.Event()
# Pick a random unused port by passing 0 for the port number
self.serv = smtpd.DebuggingServer((HOST, 0), ('nowhere', -1))
# Keep a note of what port was assigned
self.port = self.serv.socket.getsockname()[1]
serv_args = (self.serv, self.serv_evt, self.client_evt)
self.thread = threading.Thread(target=debugging_server, args=serv_args)
self.thread.start()
# wait until server thread has assigned a port number
self.serv_evt.wait()
self.serv_evt.clear()
def tearDown(self):
# indicate that the client is finished
self.client_evt.set()
# wait for the server thread to terminate
self.serv_evt.wait()
self.thread.join()
test_support.threading_cleanup(*self._threads)
# restore sys.stdout
sys.stdout = self.old_stdout
def testBasic(self):
# connect
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
smtp.quit()
def testNOOP(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (250, 'Ok')
self.assertEqual(smtp.noop(), expected)
smtp.quit()
def testRSET(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (250, 'Ok')
self.assertEqual(smtp.rset(), expected)
smtp.quit()
def testNotImplemented(self):
# EHLO isn't implemented in DebuggingServer
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (502, 'Error: command "EHLO" not implemented')
self.assertEqual(smtp.ehlo(), expected)
smtp.quit()
def testVRFY(self):
# VRFY isn't implemented in DebuggingServer
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (502, 'Error: command "VRFY" not implemented')
self.assertEqual(smtp.vrfy('[email protected]'), expected)
self.assertEqual(smtp.verify('[email protected]'), expected)
smtp.quit()
def testSecondHELO(self):
# check that a second HELO returns a message that it's a duplicate
# (this behavior is specific to smtpd.SMTPChannel)
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
smtp.helo()
expected = (503, 'Duplicate HELO/EHLO')
self.assertEqual(smtp.helo(), expected)
smtp.quit()
def testHELP(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
self.assertEqual(smtp.help(), 'Error: command "HELP" not implemented')
smtp.quit()
def testSend(self):
# connect and send mail
m = 'A test message'
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
smtp.sendmail('John', 'Sally', m)
# XXX(nnorwitz): this test is flaky and dies with a bad file descriptor
# in asyncore. This sleep might help, but should really be fixed
# properly by using an Event variable.
time.sleep(0.01)
smtp.quit()
self.client_evt.set()
self.serv_evt.wait()
self.output.flush()
mexpect = '%s%s\n%s' % (MSG_BEGIN, m, MSG_END)
self.assertEqual(self.output.getvalue(), mexpect)
class NonConnectingTests(unittest.TestCase):
def testNotConnected(self):
# Test various operations on an unconnected SMTP object that
# should raise exceptions (at present the attempt in SMTP.send
# to reference the nonexistent 'sock' attribute of the SMTP object
# causes an AttributeError)
smtp = smtplib.SMTP()
self.assertRaises(smtplib.SMTPServerDisconnected, smtp.ehlo)
self.assertRaises(smtplib.SMTPServerDisconnected,
smtp.send, 'test msg')
def testNonnumericPort(self):
# check that non-numeric port raises socket.error
self.assertRaises(socket.error, smtplib.SMTP,
"localhost", "bogus")
self.assertRaises(socket.error, smtplib.SMTP,
"localhost:bogus")
# test response of client to a non-successful HELO message
@unittest.skipUnless(threading, 'Threading required for this test.')
class BadHELOServerTests(unittest.TestCase):
def setUp(self):
self.old_stdout = sys.stdout
self.output = StringIO.StringIO()
sys.stdout = self.output
self._threads = test_support.threading_setup()
self.evt = threading.Event()
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(15)
self.port = test_support.bind_port(self.sock)
servargs = (self.evt, "199 no hello for you!\n", self.sock)
self.thread = threading.Thread(target=server, args=servargs)
self.thread.start()
self.evt.wait()
self.evt.clear()
def tearDown(self):
self.evt.wait()
self.thread.join()
test_support.threading_cleanup(*self._threads)
sys.stdout = self.old_stdout
def testFailingHELO(self):
self.assertRaises(smtplib.SMTPConnectError, smtplib.SMTP,
HOST, self.port, 'localhost', 3)
sim_users = {'[email protected]':'John A',
'[email protected]':'Sally B',
'[email protected]':'Ruth C',
}
sim_auth = ('[email protected]', 'somepassword')
sim_cram_md5_challenge = ('PENCeUxFREJoU0NnbmhNWitOMjNGNn'
'dAZWx3b29kLmlubm9zb2Z0LmNvbT4=')
sim_auth_credentials = {
'login': 'TXIuQUBzb21ld2hlcmUuY29t',
'plain': 'AE1yLkFAc29tZXdoZXJlLmNvbQBzb21lcGFzc3dvcmQ=',
'cram-md5': ('TXIUQUBZB21LD2HLCMUUY29TIDG4OWQ0MJ'
'KWZGQ4ODNMNDA4NTGXMDRLZWMYZJDMODG1'),
}
sim_auth_login_password = 'C29TZXBHC3N3B3JK'
sim_lists = {'list-1':['[email protected]','[email protected]'],
'list-2':['[email protected]',],
}
# Simulated SMTP channel & server
class SimSMTPChannel(smtpd.SMTPChannel):
def __init__(self, extra_features, *args, **kw):
self._extrafeatures = ''.join(
[ "250-{0}\r\n".format(x) for x in extra_features ])
smtpd.SMTPChannel.__init__(self, *args, **kw)
def smtp_EHLO(self, arg):
resp = ('250-testhost\r\n'
'250-EXPN\r\n'
'250-SIZE 20000000\r\n'
'250-STARTTLS\r\n'
'250-DELIVERBY\r\n')
resp = resp + self._extrafeatures + '250 HELP'
self.push(resp)
def smtp_VRFY(self, arg):
# For max compatibility smtplib should be sending the raw address.
if arg in sim_users:
self.push('250 %s %s' % (sim_users[arg], smtplib.quoteaddr(arg)))
else:
self.push('550 No such user: %s' % arg)
def smtp_EXPN(self, arg):
list_name = arg.lower()
if list_name in sim_lists:
user_list = sim_lists[list_name]
for n, user_email in enumerate(user_list):
quoted_addr = smtplib.quoteaddr(user_email)
if n < len(user_list) - 1:
self.push('250-%s %s' % (sim_users[user_email], quoted_addr))
else:
self.push('250 %s %s' % (sim_users[user_email], quoted_addr))
else:
self.push('550 No access for you!')
def smtp_AUTH(self, arg):
if arg.strip().lower()=='cram-md5':
self.push('334 {0}'.format(sim_cram_md5_challenge))
return
mech, auth = arg.split()
mech = mech.lower()
if mech not in sim_auth_credentials:
self.push('504 auth type unimplemented')
return
if mech == 'plain' and auth==sim_auth_credentials['plain']:
self.push('235 plain auth ok')
elif mech=='login' and auth==sim_auth_credentials['login']:
self.push('334 Password:')
else:
self.push('550 No access for you!')
def handle_error(self):
raise
class SimSMTPServer(smtpd.SMTPServer):
def __init__(self, *args, **kw):
self._extra_features = []
smtpd.SMTPServer.__init__(self, *args, **kw)
def handle_accept(self):
conn, addr = self.accept()
self._SMTPchannel = SimSMTPChannel(self._extra_features,
self, conn, addr)
def process_message(self, peer, mailfrom, rcpttos, data):
pass
def add_feature(self, feature):
self._extra_features.append(feature)
def handle_error(self):
raise
# Test various SMTP & ESMTP commands/behaviors that require a simulated server
# (i.e., something with more features than DebuggingServer)
@unittest.skipUnless(threading, 'Threading required for this test.')
class SMTPSimTests(unittest.TestCase):
def setUp(self):
self._threads = test_support.threading_setup()
self.serv_evt = threading.Event()
self.client_evt = threading.Event()
# Pick a random unused port by passing 0 for the port number
self.serv = SimSMTPServer((HOST, 0), ('nowhere', -1))
# Keep a note of what port was assigned
self.port = self.serv.socket.getsockname()[1]
serv_args = (self.serv, self.serv_evt, self.client_evt)
self.thread = threading.Thread(target=debugging_server, args=serv_args)
self.thread.start()
# wait until server thread has assigned a port number
self.serv_evt.wait()
self.serv_evt.clear()
def tearDown(self):
# indicate that the client is finished
self.client_evt.set()
# wait for the server thread to terminate
self.serv_evt.wait()
self.thread.join()
test_support.threading_cleanup(*self._threads)
def testBasic(self):
# smoke test
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
smtp.quit()
def testEHLO(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
# no features should be present before the EHLO
self.assertEqual(smtp.esmtp_features, {})
# features expected from the test server
expected_features = {'expn':'',
'size': '20000000',
'starttls': '',
'deliverby': '',
'help': '',
}
smtp.ehlo()
self.assertEqual(smtp.esmtp_features, expected_features)
for k in expected_features:
self.assertTrue(smtp.has_extn(k))
self.assertFalse(smtp.has_extn('unsupported-feature'))
smtp.quit()
def testVRFY(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
for email, name in sim_users.items():
expected_known = (250, '%s %s' % (name, smtplib.quoteaddr(email)))
self.assertEqual(smtp.vrfy(email), expected_known)
u = '[email protected]'
expected_unknown = (550, 'No such user: %s' % u)
self.assertEqual(smtp.vrfy(u), expected_unknown)
smtp.quit()
def testEXPN(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
for listname, members in sim_lists.items():
users = []
for m in members:
users.append('%s %s' % (sim_users[m], smtplib.quoteaddr(m)))
expected_known = (250, '\n'.join(users))
self.assertEqual(smtp.expn(listname), expected_known)
u = 'PSU-Members-List'
expected_unknown = (550, 'No access for you!')
self.assertEqual(smtp.expn(u), expected_unknown)
smtp.quit()
def testAUTH_PLAIN(self):
self.serv.add_feature("AUTH PLAIN")
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
expected_auth_ok = (235, b'plain auth ok')
self.assertEqual(smtp.login(sim_auth[0], sim_auth[1]), expected_auth_ok)
# SimSMTPChannel doesn't fully support LOGIN or CRAM-MD5 auth because they
# require a synchronous read to obtain the credentials...so instead smtpd
# sees the credential sent by smtplib's login method as an unknown command,
# which results in smtplib raising an auth error. Fortunately the error
# message contains the encoded credential, so we can partially check that it
# was generated correctly (partially, because the 'word' is uppercased in
# the error message).
def testAUTH_LOGIN(self):
self.serv.add_feature("AUTH LOGIN")
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
try: smtp.login(sim_auth[0], sim_auth[1])
except smtplib.SMTPAuthenticationError as err:
if sim_auth_login_password not in str(err):
raise "expected encoded password not found in error message"
def testAUTH_CRAM_MD5(self):
self.serv.add_feature("AUTH CRAM-MD5")
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=15)
try: smtp.login(sim_auth[0], sim_auth[1])
except smtplib.SMTPAuthenticationError as err:
if sim_auth_credentials['cram-md5'] not in str(err):
raise "expected encoded credentials not found in error message"
#TODO: add tests for correct AUTH method fallback now that the
#test infrastructure can support it.
def test_main(verbose=None):
test_support.run_unittest(GeneralTests, DebuggingServerTests,
NonConnectingTests,
BadHELOServerTests, SMTPSimTests)
if __name__ == '__main__':
test_main()
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