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"""Test script for poplib module."""
# Modified by Giampaolo Rodola' to give poplib.POP3 and poplib.POP3_SSL
# a real test suite
import poplib
import asyncore
import asynchat
import socket
import os
import errno
import threading
from unittest import TestCase, skipUnless
from test import support as test_support
HOST = test_support.HOST
PORT = 0
SUPPORTS_SSL = False
if hasattr(poplib, 'POP3_SSL'):
import ssl
SUPPORTS_SSL = True
CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "keycert3.pem")
CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "pycacert.pem")
requires_ssl = skipUnless(SUPPORTS_SSL, 'SSL not supported')
# the dummy data returned by server when LIST and RETR commands are issued
LIST_RESP = b'1 1\r\n2 2\r\n3 3\r\n4 4\r\n5 5\r\n.\r\n'
RETR_RESP = b"""From: postmaster@python.org\
\r\nContent-Type: text/plain\r\n\
MIME-Version: 1.0\r\n\
Subject: Dummy\r\n\
\r\n\
line1\r\n\
line2\r\n\
line3\r\n\
.\r\n"""
class DummyPOP3Handler(asynchat.async_chat):
CAPAS = {'UIDL': [], 'IMPLEMENTATION': ['python-testlib-pop-server']}
enable_UTF8 = False
def __init__(self, conn):
asynchat.async_chat.__init__(self, conn)
self.set_terminator(b"\r\n")
self.in_buffer = []
self.push('+OK dummy pop3 server ready. <timestamp>')
self.tls_active = False
self.tls_starting = False
def collect_incoming_data(self, data):
self.in_buffer.append(data)
def found_terminator(self):
line = b''.join(self.in_buffer)
line = str(line, 'ISO-8859-1')
self.in_buffer = []
cmd = line.split(' ')[0].lower()
space = line.find(' ')
if space != -1:
arg = line[space + 1:]
else:
arg = ""
if hasattr(self, 'cmd_' + cmd):
method = getattr(self, 'cmd_' + cmd)
method(arg)
else:
self.push('-ERR unrecognized POP3 command "%s".' %cmd)
def handle_error(self):
raise
def push(self, data):
asynchat.async_chat.push(self, data.encode("ISO-8859-1") + b'\r\n')
def cmd_echo(self, arg):
# sends back the received string (used by the test suite)
self.push(arg)
def cmd_user(self, arg):
if arg != "guido":
self.push("-ERR no such user")
self.push('+OK password required')
def cmd_pass(self, arg):
if arg != "python":
self.push("-ERR wrong password")
self.push('+OK 10 messages')
def cmd_stat(self, arg):
self.push('+OK 10 100')
def cmd_list(self, arg):
if arg:
self.push('+OK %s %s' % (arg, arg))
else:
self.push('+OK')
asynchat.async_chat.push(self, LIST_RESP)
cmd_uidl = cmd_list
def cmd_retr(self, arg):
self.push('+OK %s bytes' %len(RETR_RESP))
asynchat.async_chat.push(self, RETR_RESP)
cmd_top = cmd_retr
def cmd_dele(self, arg):
self.push('+OK message marked for deletion.')
def cmd_noop(self, arg):
self.push('+OK done nothing.')
def cmd_rpop(self, arg):
self.push('+OK done nothing.')
def cmd_apop(self, arg):
self.push('+OK done nothing.')
def cmd_quit(self, arg):
self.push('+OK closing.')
self.close_when_done()
def _get_capas(self):
_capas = dict(self.CAPAS)
if not self.tls_active and SUPPORTS_SSL:
_capas['STLS'] = []
return _capas
def cmd_capa(self, arg):
self.push('+OK Capability list follows')
if self._get_capas():
for cap, params in self._get_capas().items():
_ln = [cap]
if params:
_ln.extend(params)
self.push(' '.join(_ln))
self.push('.')
def cmd_utf8(self, arg):
self.push('+OK I know RFC6856'
if self.enable_UTF8
else '-ERR What is UTF8?!')
if SUPPORTS_SSL:
def cmd_stls(self, arg):
if self.tls_active is False:
self.push('+OK Begin TLS negotiation')
context = ssl.SSLContext()
context.load_cert_chain(CERTFILE)
tls_sock = context.wrap_socket(self.socket,
server_side=True,
do_handshake_on_connect=False,
suppress_ragged_eofs=False)
self.del_channel()
self.set_socket(tls_sock)
self.tls_active = True
self.tls_starting = True
self.in_buffer = []
self._do_tls_handshake()
else:
self.push('-ERR Command not permitted when TLS active')
def _do_tls_handshake(self):
try:
self.socket.do_handshake()
except ssl.SSLError as err:
if err.args[0] in (ssl.SSL_ERROR_WANT_READ,
ssl.SSL_ERROR_WANT_WRITE):
return
elif err.args[0] == ssl.SSL_ERROR_EOF:
return self.handle_close()
# TODO: SSLError does not expose alert information
elif ("SSLV3_ALERT_BAD_CERTIFICATE" in err.args[1] or
"SSLV3_ALERT_CERTIFICATE_UNKNOWN" in err.args[1]):
return self.handle_close()
raise
except OSError as err:
if err.args[0] == errno.ECONNABORTED:
return self.handle_close()
else:
self.tls_active = True
self.tls_starting = False
def handle_read(self):
if self.tls_starting:
self._do_tls_handshake()
else:
try:
asynchat.async_chat.handle_read(self)
except ssl.SSLEOFError:
self.handle_close()
class DummyPOP3Server(asyncore.dispatcher, threading.Thread):
handler = DummyPOP3Handler
def __init__(self, address, af=socket.AF_INET):
threading.Thread.__init__(self)
asyncore.dispatcher.__init__(self)
self.daemon = True
self.create_socket(af, socket.SOCK_STREAM)
self.bind(address)
self.listen(5)
self.active = False
self.active_lock = threading.Lock()
self.host, self.port = self.socket.getsockname()[:2]
self.handler_instance = None
def start(self):
assert not self.active
self.__flag = threading.Event()
threading.Thread.start(self)
self.__flag.wait()
def run(self):
self.active = True
self.__flag.set()
try:
while self.active and asyncore.socket_map:
with self.active_lock:
asyncore.loop(timeout=0.1, count=1)
finally:
asyncore.close_all(ignore_all=True)
def stop(self):
assert self.active
self.active = False
self.join()
def handle_accepted(self, conn, addr):
self.handler_instance = self.handler(conn)
def handle_connect(self):
self.close()
handle_read = handle_connect
def writable(self):
return 0
def handle_error(self):
raise
class TestPOP3Class(TestCase):
def assertOK(self, resp):
self.assertTrue(resp.startswith(b"+OK"))
def setUp(self):
self.server = DummyPOP3Server((HOST, PORT))
self.server.start()
self.client = poplib.POP3(self.server.host, self.server.port, timeout=3)
def tearDown(self):
self.client.close()
self.server.stop()
# Explicitly clear the attribute to prevent dangling thread
self.server = None
def test_getwelcome(self):
self.assertEqual(self.client.getwelcome(),
b'+OK dummy pop3 server ready. <timestamp>')
def test_exceptions(self):
self.assertRaises(poplib.error_proto, self.client._shortcmd, 'echo -err')
def test_user(self):
self.assertOK(self.client.user('guido'))
self.assertRaises(poplib.error_proto, self.client.user, 'invalid')
def test_pass_(self):
self.assertOK(self.client.pass_('python'))
self.assertRaises(poplib.error_proto, self.client.user, 'invalid')
def test_stat(self):
self.assertEqual(self.client.stat(), (10, 100))
def test_list(self):
self.assertEqual(self.client.list()[1:],
([b'1 1', b'2 2', b'3 3', b'4 4', b'5 5'],
25))
self.assertTrue(self.client.list('1').endswith(b"OK 1 1"))
def test_retr(self):
expected = (b'+OK 116 bytes',
[b'From: postmaster@python.org', b'Content-Type: text/plain',
b'MIME-Version: 1.0', b'Subject: Dummy',
b'', b'line1', b'line2', b'line3'],
113)
foo = self.client.retr('foo')
self.assertEqual(foo, expected)
def test_too_long_lines(self):
self.assertRaises(poplib.error_proto, self.client._shortcmd,
'echo +%s' % ((poplib._MAXLINE + 10) * 'a'))
def test_dele(self):
self.assertOK(self.client.dele('foo'))
def test_noop(self):
self.assertOK(self.client.noop())
def test_rpop(self):
self.assertOK(self.client.rpop('foo'))
def test_apop_normal(self):
self.assertOK(self.client.apop('foo', 'dummypassword'))
def test_apop_REDOS(self):
# Replace welcome with very long evil welcome.
# NB The upper bound on welcome length is currently 2048.
# At this length, evil input makes each apop call take
# on the order of milliseconds instead of microseconds.
evil_welcome = b'+OK' + (b'<' * 1000000)
with test_support.swap_attr(self.client, 'welcome', evil_welcome):
# The evil welcome is invalid, so apop should throw.
self.assertRaises(poplib.error_proto, self.client.apop, 'a', 'kb')
def test_top(self):
expected = (b'+OK 116 bytes',
[b'From: postmaster@python.org', b'Content-Type: text/plain',
b'MIME-Version: 1.0', b'Subject: Dummy', b'',
b'line1', b'line2', b'line3'],
113)
self.assertEqual(self.client.top(1, 1), expected)
def test_uidl(self):
self.client.uidl()
self.client.uidl('foo')
def test_utf8_raises_if_unsupported(self):
self.server.handler.enable_UTF8 = False
self.assertRaises(poplib.error_proto, self.client.utf8)
def test_utf8(self):
self.server.handler.enable_UTF8 = True
expected = b'+OK I know RFC6856'
result = self.client.utf8()
self.assertEqual(result, expected)
def test_capa(self):
capa = self.client.capa()
self.assertTrue('IMPLEMENTATION' in capa.keys())
def test_quit(self):
resp = self.client.quit()
self.assertTrue(resp)
self.assertIsNone(self.client.sock)
self.assertIsNone(self.client.file)
@requires_ssl
def test_stls_capa(self):
capa = self.client.capa()
self.assertTrue('STLS' in capa.keys())
@requires_ssl
def test_stls(self):
expected = b'+OK Begin TLS negotiation'
resp = self.client.stls()
self.assertEqual(resp, expected)
@requires_ssl
def test_stls_context(self):
expected = b'+OK Begin TLS negotiation'
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
ctx.load_verify_locations(CAFILE)
self.assertEqual(ctx.verify_mode, ssl.CERT_REQUIRED)
self.assertEqual(ctx.check_hostname, True)
with self.assertRaises(ssl.CertificateError):
resp = self.client.stls(context=ctx)
self.client = poplib.POP3("localhost", self.server.port, timeout=3)
resp = self.client.stls(context=ctx)
self.assertEqual(resp, expected)
if SUPPORTS_SSL:
from test.test_ftplib import SSLConnection
class DummyPOP3_SSLHandler(SSLConnection, DummyPOP3Handler):
def __init__(self, conn):
asynchat.async_chat.__init__(self, conn)
self.secure_connection()
self.set_terminator(b"\r\n")
self.in_buffer = []
self.push('+OK dummy pop3 server ready. <timestamp>')
self.tls_active = True
self.tls_starting = False
@requires_ssl
class TestPOP3_SSLClass(TestPOP3Class):
# repeat previous tests by using poplib.POP3_SSL
def setUp(self):
self.server = DummyPOP3Server((HOST, PORT))
self.server.handler = DummyPOP3_SSLHandler
self.server.start()
self.client = poplib.POP3_SSL(self.server.host, self.server.port)
def test__all__(self):
self.assertIn('POP3_SSL', poplib.__all__)
def test_context(self):
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
self.server.port, keyfile=CERTFILE, context=ctx)
self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
self.server.port, certfile=CERTFILE, context=ctx)
self.assertRaises(ValueError, poplib.POP3_SSL, self.server.host,
self.server.port, keyfile=CERTFILE,
certfile=CERTFILE, context=ctx)
self.client.quit()
self.client = poplib.POP3_SSL(self.server.host, self.server.port,
context=ctx)
self.assertIsInstance(self.client.sock, ssl.SSLSocket)
self.assertIs(self.client.sock.context, ctx)
self.assertTrue(self.client.noop().startswith(b'+OK'))
def test_stls(self):
self.assertRaises(poplib.error_proto, self.client.stls)
test_stls_context = test_stls
def test_stls_capa(self):
capa = self.client.capa()
self.assertFalse('STLS' in capa.keys())
@requires_ssl
class TestPOP3_TLSClass(TestPOP3Class):
# repeat previous tests by using poplib.POP3.stls()
def setUp(self):
self.server = DummyPOP3Server((HOST, PORT))
self.server.start()
self.client = poplib.POP3(self.server.host, self.server.port, timeout=3)
self.client.stls()
def tearDown(self):
if self.client.file is not None and self.client.sock is not None:
try:
self.client.quit()
except poplib.error_proto:
# happens in the test_too_long_lines case; the overlong
# response will be treated as response to QUIT and raise
# this exception
self.client.close()
self.server.stop()
# Explicitly clear the attribute to prevent dangling thread
self.server = None
def test_stls(self):
self.assertRaises(poplib.error_proto, self.client.stls)
test_stls_context = test_stls
def test_stls_capa(self):
capa = self.client.capa()
self.assertFalse(b'STLS' in capa.keys())
class TestTimeouts(TestCase):
def setUp(self):
self.evt = threading.Event()
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(60) # Safety net. Look issue 11812
self.port = test_support.bind_port(self.sock)
self.thread = threading.Thread(target=self.server, args=(self.evt,self.sock))
self.thread.daemon = True
self.thread.start()
self.evt.wait()
def tearDown(self):
self.thread.join()
# Explicitly clear the attribute to prevent dangling thread
self.thread = None
def server(self, evt, serv):
serv.listen()
evt.set()
try:
conn, addr = serv.accept()
conn.send(b"+ Hola mundo\n")
conn.close()
except socket.timeout:
pass
finally:
serv.close()
def testTimeoutDefault(self):
self.assertIsNone(socket.getdefaulttimeout())
socket.setdefaulttimeout(30)
try:
pop = poplib.POP3(HOST, self.port)
finally:
socket.setdefaulttimeout(None)
self.assertEqual(pop.sock.gettimeout(), 30)
pop.close()
def testTimeoutNone(self):
self.assertIsNone(socket.getdefaulttimeout())
socket.setdefaulttimeout(30)
try:
pop = poplib.POP3(HOST, self.port, timeout=None)
finally:
socket.setdefaulttimeout(None)
self.assertIsNone(pop.sock.gettimeout())
pop.close()
def testTimeoutValue(self):
pop = poplib.POP3(HOST, self.port, timeout=30)
self.assertEqual(pop.sock.gettimeout(), 30)
pop.close()
def test_main():
tests = [TestPOP3Class, TestTimeouts,
TestPOP3_SSLClass, TestPOP3_TLSClass]
thread_info = test_support.threading_setup()
try:
test_support.run_unittest(*tests)
finally:
test_support.threading_cleanup(*thread_info)
if __name__ == '__main__':
test_main()
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