# 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 = 3


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(" -n num         only run `num` random tests instead of a full set")
    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()
    dhe = False
    echo = False

    argv = sys.argv[1:]
    opts, args = getopt.getopt(argv, "h:p:e: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 == '-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())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectCertificate())
    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
    failed = []
    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'])]
    regular_tests = [(k, v) for k, v in conversations.items() if k != 'sanity']
    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
        try:
            runner.run()
        except Exception:
            print("Error while processing")
            print(traceback.format_exc())
            res = False

        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("version: {0}\n".format(version))

    print("Test end")
    print("successful: {0}".format(good))
    print("failed: {0}".format(bad))
    failed_sorted = sorted(failed, key=natural_sort_keys)
    print("  {0}".format('\n  '.join(repr(i) for i in failed_sorted)))

    if bad > 0:
        sys.exit(1)

if __name__ == "__main__":
    main()
