# Author: Stanislav Zidek, (c) 2018
# Released under Gnu GPL v2.0, see LICENSE file for details

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, AlertGenerator, \
        fuzz_message
from tlsfuzzer.expect import ExpectServerHello, ExpectCertificate, \
        ExpectServerHelloDone, ExpectChangeCipherSpec, ExpectFinished, \
        ExpectAlert, ExpectApplicationData, ExpectClose, \
        ExpectEncryptedExtensions, ExpectCertificateVerify, \
        ExpectNewSessionTicket, ExpectNoMessage

from tlslite.constants import CipherSuite, AlertLevel, AlertDescription, \
        TLS_1_3_DRAFT, GroupName, ExtensionType, SignatureScheme
from tlslite.keyexchange import ECDHKeyExchange
from tlsfuzzer.utils.lists import natural_sort_keys
from tlslite.extensions import KeyShareEntry, ClientKeyShareExtension, \
        SupportedVersionsExtension, SupportedGroupsExtension, \
        SignatureAlgorithmsExtension, SignatureAlgorithmsCertExtension
from tlsfuzzer.helpers import RSA_SIG_ALL, key_share_ext_gen


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(40)")
    print("                (excluding \"sanity\" tests)")
    print(" --help         this message")


def main():
    host = "localhost"
    port = 4433
    num_limit = 40
    run_exclude = set()
    expected_failures = {}
    last_exp_tmp = None

    argv = sys.argv[1:]
    opts, args = getopt.getopt(argv, "h:p:e:x:X:n:", ["help"])
    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 == '--help':
            help_msg()
            sys.exit(0)
        else:
            raise ValueError("Unknown option: {0}".format(opt))

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

    conversations = {}

    # sanity conversation
    conversation = Connect(host, port)
    node = conversation
    ciphers = [CipherSuite.TLS_AES_128_GCM_SHA256,
               CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    ext = {}
    groups = [GroupName.secp256r1]
    ext[ExtensionType.key_share] = key_share_ext_gen(groups)
    ext[ExtensionType.supported_versions] = SupportedVersionsExtension()\
        .create([TLS_1_3_DRAFT, (3, 3)])
    ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
        .create(groups)
    sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                SignatureScheme.rsa_pss_pss_sha256,
                SignatureScheme.rsa_pss_rsae_sha384,
                SignatureScheme.rsa_pss_pss_sha384]
    ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
        .create(sig_algs)
    ext[ExtensionType.signature_algorithms_cert] = SignatureAlgorithmsCertExtension()\
        .create(RSA_SIG_ALL)
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectEncryptedExtensions())
    node = node.add_child(ExpectCertificate())
    node = node.add_child(ExpectCertificateVerify())
    node = node.add_child(ExpectFinished())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET / HTTP/1.0\r\n\r\n")))

    # This message is optional and may show up 0 to many times
    cycle = ExpectNewSessionTicket()
    node = node.add_child(cycle)
    node.add_child(cycle)

    node.next_sibling = ExpectApplicationData()
    node = node.next_sibling.add_child(AlertGenerator(AlertLevel.warning,
                                       AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity"] = conversation

    # empty
    ciphers = [CipherSuite.TLS_AES_128_GCM_SHA256,
               CipherSuite.TLS_AES_256_GCM_SHA384]
    for cipher in ciphers:
        conversation = Connect(host, port)
        node = conversation
        ciphers = [cipher,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
        ext = {}
        groups = [GroupName.secp256r1]
        ext[ExtensionType.key_share] = key_share_ext_gen(groups)
        ext[ExtensionType.supported_versions] = SupportedVersionsExtension()\
            .create([TLS_1_3_DRAFT, (3, 3)])
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
            .create(groups)
        sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                    SignatureScheme.rsa_pss_pss_sha256,
                    SignatureScheme.rsa_pss_rsae_sha384,
                    SignatureScheme.rsa_pss_pss_sha384]
        ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
            .create(sig_algs)
        ext[ExtensionType.signature_algorithms_cert] = SignatureAlgorithmsCertExtension()\
            .create(RSA_SIG_ALL)
        node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
        node = node.add_child(ExpectServerHello())
        node = node.add_child(ExpectChangeCipherSpec())
        node = node.add_child(ExpectEncryptedExtensions())
        node = node.add_child(ExpectCertificate())
        node = node.add_child(ExpectCertificateVerify())
        node = node.add_child(ExpectFinished())
        node = node.add_child(FinishedGenerator(trunc_start=0,
                                                trunc_end=0))

        # This message may be sent right after server finished
        cycle = ExpectNewSessionTicket()
        node = node.add_child(cycle)
        node.add_child(cycle)

        # we do not expect any application data back
        # after malforming the Finished message
        node.next_sibling = ExpectAlert(AlertLevel.fatal,
                                        AlertDescription.decode_error)
        node = node.next_sibling.add_child(ExpectClose())
        conversations["empty - cipher %s" \
                         % (CipherSuite.ietfNames[cipher])] = conversation

    # single bit error
    scenarios = [(CipherSuite.TLS_AES_128_GCM_SHA256, 32),
                 (CipherSuite.TLS_AES_256_GCM_SHA384, 48)]
    for cipher, prf_bytes in scenarios:
        for mbit in range(8*prf_bytes):
            mbyte = mbit // 8 + 1
            conversation = Connect(host, port)
            node = conversation
            ciphers = [cipher,
                       CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
            ext = {}
            groups = [GroupName.secp256r1]
            ext[ExtensionType.key_share] = key_share_ext_gen(groups)
            ext[ExtensionType.supported_versions] = SupportedVersionsExtension()\
                .create([TLS_1_3_DRAFT, (3, 3)])
            ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
                .create(groups)
            sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                        SignatureScheme.rsa_pss_pss_sha256,
                        SignatureScheme.rsa_pss_rsae_sha384,
                        SignatureScheme.rsa_pss_pss_sha384]
            ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
                .create(sig_algs)
            ext[ExtensionType.signature_algorithms_cert] = SignatureAlgorithmsCertExtension()\
                .create(RSA_SIG_ALL)
            node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
            node = node.add_child(ExpectServerHello())
            node = node.add_child(ExpectChangeCipherSpec())
            node = node.add_child(ExpectEncryptedExtensions())
            node = node.add_child(ExpectCertificate())
            node = node.add_child(ExpectCertificateVerify())
            node = node.add_child(ExpectFinished())
            node = node.add_child(fuzz_message(FinishedGenerator(),
                                               xors={-mbyte: 0x01 << mbit%8}))
            # This message may be sent right after server finished
            cycle = ExpectNewSessionTicket()
            node = node.add_child(cycle)
            node.add_child(cycle)

            # we do not expect any application data back
            # after malforming the Finished message
            node.next_sibling = ExpectAlert(AlertLevel.fatal,
                                            AlertDescription.decrypt_error)
            node = node.next_sibling.add_child(ExpectClose())
            conversations["single bit error - cipher %s, bit %d" \
                          % (CipherSuite.ietfNames[cipher],
                             mbit)] = conversation

    # truncation
    # cipher, start, end
    scenarios = [
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -1),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -2),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -4),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -8),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -16),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  -32),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0,  12), # TLS-1.2 size
        (CipherSuite.TLS_AES_128_GCM_SHA256, 1,  None),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 2,  None),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 4,  None),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 8,  None),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 16, None),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 32, None),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -1),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -2),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -4),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -8),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -16), # SHA-256 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  -32),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0,  12), # TLS-1.2 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 1,  None),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 2,  None),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 4,  None),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 8,  None),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 16, None), # SHA-256 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 32, None)
        ]
    for cipher, start, end in scenarios:
        conversation = Connect(host, port)
        node = conversation
        ciphers = [cipher,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
        ext = {}
        groups = [GroupName.secp256r1]
        ext[ExtensionType.key_share] = key_share_ext_gen(groups)
        ext[ExtensionType.supported_versions] = SupportedVersionsExtension()\
            .create([TLS_1_3_DRAFT, (3, 3)])
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
            .create(groups)
        sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                    SignatureScheme.rsa_pss_pss_sha256,
                    SignatureScheme.rsa_pss_rsae_sha384,
                    SignatureScheme.rsa_pss_pss_sha384]
        ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
            .create(sig_algs)
        ext[ExtensionType.signature_algorithms_cert] = SignatureAlgorithmsCertExtension()\
            .create(RSA_SIG_ALL)
        node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
        node = node.add_child(ExpectServerHello())
        node = node.add_child(ExpectChangeCipherSpec())
        node = node.add_child(ExpectEncryptedExtensions())
        node = node.add_child(ExpectCertificate())
        node = node.add_child(ExpectCertificateVerify())
        node = node.add_child(ExpectFinished())
        node = node.add_child(FinishedGenerator(trunc_start=start,
                                                trunc_end=end))

        # This message may be sent right after server finished
        cycle = ExpectNewSessionTicket()
        node = node.add_child(cycle)
        node.add_child(cycle)

        # we do not expect any application data back
        # after malforming the Finished message
        node.next_sibling = ExpectAlert(AlertLevel.fatal,
                                        AlertDescription.decode_error)
        node = node.next_sibling.add_child(ExpectClose())
        conversations["truncation - cipher %s, start %d, end %s" \
                      % (CipherSuite.ietfNames[cipher],
                         start, end)] = conversation

    # padding
    # cipher, padding byte, left padding, right padding
    scenarios = [
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 1),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 2),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 4),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 8),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 16), # SHA-384 size
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 32),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 48),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 2**14-4-32), # max record
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 0x20000), # intermediate
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 0x30000), # bigger than max ClientHello
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 0, 256**3-1-32), # max handshake
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 1, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 2, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 4, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 8, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 16, 0), # SHA-384 size
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 32, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 48, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 2**14-4-32, 0), # max record
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 12, 0),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 1, 1),
        (CipherSuite.TLS_AES_128_GCM_SHA256, 0, 8, 8), # SHA-384 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 1),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 2),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 4),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 8),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 16), # SHA-512 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 32),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 48),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 2**14-4-48), # max record
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 0x20000),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 0x30000), # bigger than max ClientHello
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 256**3-1-48), # max handshake
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 0, 12),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 1, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 2, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 4, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 8, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 16, 0), # SHA-512 size
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 32, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 48, 0),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 2**14-4-48, 0), # max record
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 1, 1),
        (CipherSuite.TLS_AES_256_GCM_SHA384, 0, 8, 8) # SHA-512 size
        ]
    for cipher, pad_byte, pad_left, pad_right in scenarios:
        # longer timeout for longer messages
        # Because the client is sending encrypted data without waiting
        # on any server response, it can actually produce data at a faster
        # rate than the server is able to process it, meaning that a server
        # that aborts only after decrypting a full handshake message may have
        # quite a few records in the queue after we, as a client have finished
        # sending them. Since tlslite-ng has the ciphers implemented in
        # pure python, they are very slow, speeds of just 71.5KiB/s for
        # AES-256-GCM are not atypical. which translates to about 4 minutes
        # to transfer this data. Set the timeout to 5 for a small margin of
        # error.
        # Note: because we still are waiting for the server to send us an alert
        # (all graph terminal nodes go through ExpectAlert), server that fails
        # to do that will still cause the whole test conversation to fail in
        # case it just closes the connection on us
        timeout = 5 if max(pad_left, pad_right) < 2**14 * 4 else 300
        conversation = Connect(host, port, timeout=timeout)
        node = conversation
        ciphers = [cipher,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
        ext = {}
        groups = [GroupName.secp256r1]
        ext[ExtensionType.key_share] = key_share_ext_gen(groups)
        ext[ExtensionType.supported_versions] = SupportedVersionsExtension()\
            .create([TLS_1_3_DRAFT, (3, 3)])
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
            .create(groups)
        sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                    SignatureScheme.rsa_pss_pss_sha256,
                    SignatureScheme.rsa_pss_rsae_sha384,
                    SignatureScheme.rsa_pss_pss_sha384]
        ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
            .create(sig_algs)
        ext[ExtensionType.signature_algorithms_cert] = SignatureAlgorithmsCertExtension()\
            .create(RSA_SIG_ALL)
        node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
        node = node.add_child(ExpectServerHello())
        node = node.add_child(ExpectChangeCipherSpec())
        node = node.add_child(ExpectEncryptedExtensions())
        node = node.add_child(ExpectCertificate())
        node = node.add_child(ExpectCertificateVerify())
        node = node.add_child(ExpectFinished())

        # (the crazy handling of the messages below is because we are
        # sending one message (Finished) in multiple records, and server
        # can abort the connection after processing any number of records)

        # conditionally wait for NewSessionTicket messages
        # this will help in case the server does send early NST (without
        # waiting for client Finished) but will abort reading of the
        # Finished after one record
        no_message = node.add_child(ExpectNoMessage(0.001))
        nst = ExpectNewSessionTicket(description='first')
        no_message.next_sibling = nst
        nst.add_child(no_message)
        node = no_message

        # alert+close can happen during sending large Finished message,
        # therefore we are specifying it as its sibling
        close_node = ExpectAlert(AlertLevel.fatal,
                                 AlertDescription.decode_error)
        close_node.add_child(ExpectClose())
        node = node.add_child(FinishedGenerator(
                                  pad_byte=pad_byte,
                                  pad_left=pad_left,
                                  pad_right=pad_right))
        node.next_sibling = close_node

        # This message may be sent right after server finished
        cycle = ExpectNewSessionTicket(description='second')
        node = node.add_child(cycle)
        node.add_child(cycle)

        # we do not expect any application data back
        # after malforming the Finished message
        node.next_sibling = close_node

        conversations["padding - cipher %s, "
                      "pad_byte %d, "
                      "pad_left %d, "
                      "pad_right %d" \
                      % (CipherSuite.ietfNames[cipher],
                         pad_byte, pad_left, pad_right)] = 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:
        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("Fuzzing TLS 1.3 Finished messages")

    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()