# Author: Hubert Kario, (c) 2015-2019
# Released under Gnu GPL v2.0, see LICENSE file for details
"""Example MAC value fuzzer"""

from __future__ import print_function
import traceback
import sys
import getopt
from itertools import chain
from random import sample

from tlsfuzzer.runner import Runner
from tlsfuzzer.messages import Connect, ClientHelloGenerator, \
        ClientKeyExchangeGenerator, ChangeCipherSpecGenerator, \
        FinishedGenerator, ApplicationDataGenerator, \
        fuzz_padding, AlertGenerator
from tlsfuzzer.expect import ExpectServerHello, ExpectCertificate, \
        ExpectServerHelloDone, ExpectChangeCipherSpec, ExpectFinished, \
        ExpectAlert, ExpectClose, ExpectApplicationData, \
        ExpectServerKeyExchange
from tlsfuzzer.utils.lists import natural_sort_keys
from tlsfuzzer.helpers import RSA_SIG_ALL, AutoEmptyExtension

from tlslite.constants import CipherSuite, AlertLevel, AlertDescription, \
        GroupName, ExtensionType
from tlslite.extensions import SupportedGroupsExtension, \
        SignatureAlgorithmsExtension, SignatureAlgorithmsCertExtension
from tlslite.utils.compat import compatAscii2Bytes


version = 6


def help_msg():
    print("Usage: <script-name> [-h hostname] [-p port] [[probe-name] ...]")
    print(" -h hostname    name of the host to run the test against")
    print("                localhost by default")
    print(" -p port        port number to use for connection, 4433 by default")
    print(" probe-name     if present, will run only the probes with given")
    print("                names and not all of them, e.g \"sanity\"")
    print(" -e probe-name  exclude the probe from the list of the ones run")
    print("                may be specified multiple times")
    print(" -x probe-name  expect the probe to fail. When such probe passes despite being marked like this")
    print("                it will be reported in the test summary and the whole script will fail.")
    print("                May be specified multiple times.")
    print(" -X message     expect the `message` substring in exception raised during")
    print("                execution of preceding expected failure probe")
    print("                usage: [-x probe-name] [-X exception], order is compulsory!")
    print(" -n num         run 'num' or all(if 0) tests instead of default(all)")
    print("                (\"sanity\" tests are always executed)")
    print(" -d             negotiate (EC)DHE instead of RSA key exchange")
    print(" --echo-headers expect the server to echo the headers (so its reply")
    print("                will be split over two ApplicationData records, not")
    print("                one for the tests with 2**14 byte payload)")
    print(" --help         this message")


def add_dhe_extensions(extensions):
    groups = [GroupName.secp256r1,
              GroupName.ffdhe2048]
    extensions[ExtensionType.supported_groups] = SupportedGroupsExtension()\
        .create(groups)
    extensions[ExtensionType.signature_algorithms] = \
        SignatureAlgorithmsExtension().create(RSA_SIG_ALL)
    extensions[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(RSA_SIG_ALL)



def main():
    """check if atypical padding is accepted by server"""
    host = "localhost"
    port = 4433
    num_limit = None
    run_exclude = set()
    expected_failures = {}
    last_exp_tmp = None
    dhe = False
    echo = False

    argv = sys.argv[1:]
    opts, args = getopt.getopt(argv, "h:p:e:x:X:n:d", ["help", "echo-headers"])
    for opt, arg in opts:
        if opt == '-h':
            host = arg
        elif opt == '-p':
            port = int(arg)
        elif opt == '-e':
            run_exclude.add(arg)
        elif opt == '-x':
            expected_failures[arg] = None
            last_exp_tmp = str(arg)
        elif opt == '-X':
            if not last_exp_tmp:
                raise ValueError("-x has to be specified before -X")
            expected_failures[last_exp_tmp] = str(arg)
        elif opt == '-n':
            num_limit = int(arg)
        elif opt == '-d':
            dhe = True
        elif opt == '--help':
            help_msg()
            sys.exit(0)
        elif opt == '--echo-headers':
            echo = True
        else:
            raise ValueError("Unknown option: {0}".format(opt))

    if args:
        run_only = set(args)
    else:
        run_only = None

    conversations = {}

    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET / HTTP/1.0\r\n\r\n")))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity"] = conversation

    # check if SHA256 ciphers work
    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET / HTTP/1.0\r\n\r\n")))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity - SHA256 HMAC"] = conversation

    # check if SHA384 ciphers work
    conversation = Connect(host, port)
    node = conversation
    ext = {}
    add_dhe_extensions(ext)
    ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
               CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET / HTTP/1.0\r\n\r\n")))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity - SHA384 HMAC"] = conversation

    # check if Encrypt Then Mac works
    conversation = Connect(host, port)
    node = conversation
    ext = {ExtensionType.encrypt_then_mac: AutoEmptyExtension()}
    if dhe:
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    extensions = {ExtensionType.encrypt_then_mac:None,
                  ExtensionType.renegotiation_info:None}
    node = node.add_child(ExpectServerHello(extensions=extensions))
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET / HTTP/1.0\r\n\r\n")))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity - encrypt then MAC"] = conversation

    # maximum size of padding
    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: a\r\n\r\n"
    hmac_tag_length = 20
    block_size = 16
    # make sure that padding has full blocks to work with
    assert (len(text) + hmac_tag_length) % block_size == 0
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert(AlertLevel.warning,
                                      AlertDescription.close_notify))
    node.next_sibling = ExpectClose()
    node = node.add_child(ExpectClose())

    conversations["256 bytes of padding"] = \
            conversation

    # maximum size of padding with SHA256
    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: aaaaa\r\n\r\n"
    hmac_tag_length = 32
    block_size = 16
    # make sure that padding has full blocks to work with
    assert (len(text) + hmac_tag_length) % block_size == 0, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert(AlertLevel.warning,
                                      AlertDescription.close_notify))
    node.next_sibling = ExpectClose()
    node = node.add_child(ExpectClose())

    conversations["256 bytes of padding with SHA256"] = \
            conversation

    # ... and SHA384
    conversation = Connect(host, port)
    node = conversation
    ext = {}
    groups = [GroupName.secp256r1,
              GroupName.ffdhe2048]
    ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
        .create(groups)
    ext[ExtensionType.signature_algorithms] = \
        SignatureAlgorithmsExtension().create(RSA_SIG_ALL)
    ext[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(RSA_SIG_ALL)
    ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
               CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: aaaaa\r\n\r\n"
    hmac_tag_length = 48
    block_size = 16
    # make sure that padding has full blocks to work with
    assert (len(text) + hmac_tag_length) % block_size == 0, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["256 bytes of padding with SHA384"] = \
            conversation

    # longest possible padding with max size Application data
    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: a\r\n"
    for i in range(3):
        text += b"X-ba" + compatAscii2Bytes(str(i)) + b": " + \
                b"a" * (4096 - 9) + b"\r\n"
    text += b"X-ba3: " + b"a" * (4096 - 37) + b"\r\n"
    text += b"\r\n"
    assert len(text) == 2**14, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=252))
    if echo:
        node = node.add_child(ExpectApplicationData(size=2**14))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert(AlertLevel.warning,
                                      AlertDescription.close_notify))
    node.next_sibling = ExpectClose()
    node = node.add_child(ExpectClose())

    conversations["2^14 bytes of AppData with 253 bytes of padding (SHA1)"] = \
            conversation

    # longest possible padding with max size Application data (and EtM)
    conversation = Connect(host, port)
    node = conversation
    ext = {ExtensionType.encrypt_then_mac: AutoEmptyExtension()}
    if dhe:
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    extensions = {ExtensionType.encrypt_then_mac:None,
                  ExtensionType.renegotiation_info:None}
    node = node.add_child(ExpectServerHello(extensions=extensions))
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: a\r\n"
    for i in range(3):
        text += b"X-ba" + compatAscii2Bytes(str(i)) + b": " + \
                b"a" * (4096 - 9) + b"\r\n"
    text += b"X-ba3: " + b"a" * (4096 - 37) + b"\r\n"
    text += b"\r\n"
    assert len(text) == 2**14, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    if echo:
        node = node.add_child(ExpectApplicationData(size=2**14))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert(AlertLevel.warning,
                                      AlertDescription.close_notify))
    node.next_sibling = ExpectClose()
    node = node.add_child(ExpectClose())

    conversations["2^14 bytes of AppData with 256 bytes of padding (SHA1 "
                  "+ Encrypt then MAC)"] = \
            conversation

    # longest possible padding with max size Application data with SHA256
    conversation = Connect(host, port)
    node = conversation
    if dhe:
        ext = {}
        add_dhe_extensions(ext)
        ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = None
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA256,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: a\r\n"
    for i in range(3):
        text += b"X-ba" + compatAscii2Bytes(str(i)) + b": " + \
                b"a" * (4096 - 9) + b"\r\n"
    text += b"X-ba3: " + b"a" * (4096 - 37) + b"\r\n"
    text += b"\r\n"
    assert len(text) == 2**14, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    if echo:
        node = node.add_child(ExpectApplicationData(size=2**14))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert(AlertLevel.warning,
                                      AlertDescription.close_notify))
    node.next_sibling = ExpectClose()
    node = node.add_child(ExpectClose())

    conversations["2^14 bytes of AppData with 256 bytes of padding (SHA256)"] = \
            conversation

    conversation = Connect(host, port)
    node = conversation
    ext = {}
    add_dhe_extensions(ext)
    ciphers = [CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
               CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    text = b"GET / HTTP/1.0\r\nX-bad: a\r\n"
    for i in range(3):
        text += b"X-ba" + compatAscii2Bytes(str(i)) + b": " + \
                b"a" * (4096 - 9) + b"\r\n"
    text += b"X-ba3: " + b"a" * (4096 - 37) + b"\r\n"
    text += b"\r\n"
    assert len(text) == 2**14, len(text)
    node = node.add_child(fuzz_padding(ApplicationDataGenerator(text),
                                       min_length=255))
    if echo:
        node = node.add_child(ExpectApplicationData(size=2**14))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["2^14 bytes of AppData with 256 bytes of padding (SHA384)"] = \
            conversation

    # run the conversation
    good = 0
    bad = 0
    xfail = 0
    xpass = 0
    failed = []
    xpassed = []
    if not num_limit:
        num_limit = len(conversations)

    # make sure that sanity test is run first and last
    # to verify that server was running and kept running throughout
    sanity_tests = [('sanity', conversations['sanity'])]
    if run_only:
        if num_limit > len(run_only):
            num_limit = len(run_only)
        regular_tests = [(k, v) for k, v in conversations.items() if
                          k in run_only]
    else:
        regular_tests = [(k, v) for k, v in conversations.items() if
                         (k != 'sanity') and k not in run_exclude]
    sampled_tests = sample(regular_tests, min(num_limit, len(regular_tests)))
    ordered_tests = chain(sanity_tests, sampled_tests, sanity_tests)

    for c_name, c_test in ordered_tests:
        if run_only and c_name not in run_only or c_name in run_exclude:
            continue
        print("{0} ...".format(c_name))

        runner = Runner(c_test)

        res = True
        exception = None
        try:
            runner.run()
        except Exception as exp:
            exception = exp
            print("Error while processing")
            print(traceback.format_exc())
            res = False

        if c_name in expected_failures:
            if res:
                xpass += 1
                xpassed.append(c_name)
                print("XPASS-expected failure but test passed\n")
            else:
                if expected_failures[c_name] is not None and  \
                    expected_failures[c_name] not in str(exception):
                        bad += 1
                        failed.append(c_name)
                        print("Expected error message: {0}\n"
                            .format(expected_failures[c_name]))
                else:
                    xfail += 1
                    print("OK-expected failure\n")
        else:
            if res:
                good += 1
                print("OK\n")
            else:
                bad += 1
                failed.append(c_name)

    print("Test if server can handle records with large (but valid) padding")
    print("Tests both with small records and records that carry maximum amount")
    print("of user data.\n")

    print("Test end")
    print(20 * '=')
    print("version: {0}".format(version))
    print(20 * '=')
    print("TOTAL: {0}".format(len(sampled_tests) + 2*len(sanity_tests)))
    print("SKIP: {0}".format(len(run_exclude.intersection(conversations.keys()))))
    print("PASS: {0}".format(good))
    print("XFAIL: {0}".format(xfail))
    print("FAIL: {0}".format(bad))
    print("XPASS: {0}".format(xpass))
    print(20 * '=')
    sort = sorted(xpassed ,key=natural_sort_keys)
    if len(sort):
        print("XPASSED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))
    sort = sorted(failed, key=natural_sort_keys)
    if len(sort):
        print("FAILED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))

    if bad or xpass:
        sys.exit(1)

if __name__ == "__main__":
    main()