summaryrefslogtreecommitdiffstats
path: root/test/hook.py
AgeCommit message (Expand)AuthorFilesLines
2018-10-10Setup, teardown, DEBUG=core, FAILFAST fixesjuraj.linkes1-21/+14
2018-08-30Fix the default step when using STEP=1 while testingjuraj.linkes1-1/+1
2018-08-23CSIT-1139: Implement parallel test executionjuraj.linkes1-5/+5
2018-03-31make test: print a warning in case a core_pattern contains a filter programAndrew Yourtchenko1-0/+2
2018-03-24make test: enhance core-file informationKlement Sekera1-2/+12
2018-03-23make test: code cleanupKlement Sekera1-3/+5
2018-03-14make test: early core detection, code cleanupKlement Sekera1-0/+2
2018-02-01IPv4/6 reassemblyKlement Sekera1-9/+5
2017-11-06make test: fix DEBUG=core errorKlement Sekera1-1/+1
2017-08-10make test: detect hung testsKlement Sekera1-22/+7
2017-01-11make test: improve documentation and PEP8 complianceKlement Sekera1-2/+2
2016-12-07BFD: basic asynchronous session up/downKlement Sekera1-8/+12
2016-11-28make test: detect early vpp crashKlement Sekera1-2/+1
2016-11-02Improve debug-cli in test frameworkKlement Sekera1-1/+1
2016-10-31add vpp debugging support to test frameworkKlement Sekera1-8/+104
2016-10-26refactor test frameworkKlement Sekera1-0/+128
='n330' href='#n330'>330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 
""" test framework utilities """

import abc
import socket
from socket import AF_INET6
import six
import sys
import os.path

import scapy.compat
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP
from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, IPv6ExtHdrRouting,\
    IPv6ExtHdrHopByHop
from scapy.packet import Raw
from scapy.utils import hexdump
from scapy.utils6 import in6_mactoifaceid

from io import BytesIO
from vpp_papi import mac_pton


def ppp(headline, packet):
    """ Return string containing the output of scapy packet.show() call. """
    return '%s\n%s\n\n%s\n' % (headline,
                               hexdump(packet, dump=True),
                               packet.show(dump=True))


def ppc(headline, capture, limit=10):
    """ Return string containing ppp() printout for a capture.

    :param headline: printed as first line of output
    :param capture: packets to print
    :param limit: limit the print to # of packets
    """
    if not capture:
        return headline
    tail = ""
    if limit < len(capture):
        tail = "\nPrint limit reached, %s out of %s packets printed" % (
            limit, len(capture))
    body = "".join([ppp("Packet #%s:" % count, p)
                    for count, p in zip(range(0, limit), capture)])
    return "%s\n%s%s" % (headline, body, tail)


def ip4_range(ip4, s, e):
    tmp = ip4.rsplit('.', 1)[0]
    return ("%s.%d" % (tmp, i) for i in range(s, e))


def ip4n_range(ip4n, s, e):
    ip4 = socket.inet_ntop(socket.AF_INET, ip4n)
    return (socket.inet_pton(socket.AF_INET, ip)
            for ip in ip4_range(ip4, s, e))


# wrapper around scapy library function.
def mk_ll_addr(mac):
    euid = in6_mactoifaceid(mac)
    addr = "fe80::" + euid
    return addr


def ip6_normalize(ip6):
    return socket.inet_ntop(socket.AF_INET6,
                            socket.inet_pton(socket.AF_INET6, ip6))


def get_core_path(tempdir):
    return "%s/%s" % (tempdir, get_core_pattern())


def is_core_present(tempdir):
    return os.path.isfile(get_core_path(tempdir))


def get_core_pattern():
    with open("/proc/sys/kernel/core_pattern", "r") as f:
        corefmt = f.read().strip()
    return corefmt


def check_core_path(logger, core_path):
    corefmt = get_core_pattern()
    if corefmt.startswith("|"):
        logger.error(
            "WARNING: redirecting the core dump through a"
            " filter may result in truncated dumps.")
        logger.error(
            "   You may want to check the filter settings"
            " or uninstall it and edit the"
            " /proc/sys/kernel/core_pattern accordingly.")
        logger.error(
            "   current core pattern is: %s" % corefmt)


class NumericConstant(object):

    desc_dict = {}

    def __init__(self, value):
        self._value = value

    def __int__(self):
        return self._value

    def __long__(self):
        return self._value

    def __str__(self):
        if self._value in self.desc_dict:
            return self.desc_dict[self._value]
        return ""


class Host(object):
    """ Generic test host "connected" to VPPs interface. """

    @property
    def mac(self):
        """ MAC address """
        return self._mac

    @property
    def bin_mac(self):
        """ MAC address """
        return mac_pton(self._mac)

    @property
    def ip4(self):
        """ IPv4 address - string """
        return self._ip4

    @property
    def ip4n(self):
        """ IPv4 address of remote host - raw, suitable as API parameter."""
        return socket.inet_pton(socket.AF_INET, self._ip4)

    @property
    def ip6(self):
        """ IPv6 address - string """
        return self._ip6

    @property
    def ip6n(self):
        """ IPv6 address of remote host - raw, suitable as API parameter."""
        return socket.inet_pton(socket.AF_INET6, self._ip6)

    @property
    def ip6_ll(self):
        """ IPv6 link-local address - string """
        return self._ip6_ll

    @property
    def ip6n_ll(self):
        """ IPv6 link-local address of remote host -
        raw, suitable as API parameter."""
        return socket.inet_pton(socket.AF_INET6, self._ip6_ll)

    def __eq__(self, other):
        if isinstance(other, Host):
            return (self.mac == other.mac and
                    self.ip4 == other.ip4 and
                    self.ip6 == other.ip6 and
                    self.ip6_ll == other.ip6_ll)
        else:
            return False

    def __ne__(self, other):
        return not self.__eq__(other)

    def __repr__(self):
        return "Host { mac:%s ip4:%s ip6:%s ip6_ll:%s }" % (self.mac,
                                                            self.ip4,
                                                            self.ip6,
                                                            self.ip6_ll)

    def __hash__(self):
        return hash(self.__repr__())

    def __init__(self, mac=None, ip4=None, ip6=None, ip6_ll=None):
        self._mac = mac
        self._ip4 = ip4
        self._ip6 = ip6
        self._ip6_ll = ip6_ll


class ForeignAddressFactory(object):
    count = 0
    prefix_len = 24
    net_template = '10.10.10.{}'
    net = net_template.format(0) + '/' + str(prefix_len)

    def get_ip4(self):
        if self.count > 255:
            raise Exception("Network host address exhaustion")
        self.count += 1
        return self.net_template.format(self.count)


class L4_Conn():
    """ L4 'connection' tied to two VPP interfaces """

    def __init__(self, testcase, if1, if2, af, l4proto, port1, port2):
        self.testcase = testcase
        self.ifs = [None, None]
        self.ifs[0] = if1
        self.ifs[1] = if2
        self.address_family = af
        self.l4proto = l4proto
        self.ports = [None, None]
        self.ports[0] = port1
        self.ports[1] = port2
        self

    def pkt(self, side, l4args={}, payload="x"):
        is_ip6 = 1 if self.address_family == AF_INET6 else 0
        s0 = side
        s1 = 1 - side
        src_if = self.ifs[s0]
        dst_if = self.ifs[s1]
        layer_3 = [IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4),
                   IPv6(src=src_if.remote_ip6, dst=dst_if.remote_ip6)]
        merged_l4args = {'sport': self.ports[s0], 'dport': self.ports[s1]}
        merged_l4args.update(l4args)
        p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
             layer_3[is_ip6] /
             self.l4proto(**merged_l4args) /
             Raw(payload))
        return p

    def send(self, side, flags=None, payload=""):
        l4args = {}
        if flags is not None:
            l4args['flags'] = flags
        self.ifs[side].add_stream(self.pkt(side,
                                           l4args=l4args, payload=payload))
        self.ifs[1 - side].enable_capture()
        self.testcase.pg_start()

    def recv(self, side):
        p = self.ifs[side].wait_for_packet(1)
        return p

    def send_through(self, side, flags=None, payload=""):
        self.send(side, flags, payload)
        p = self.recv(1 - side)
        return p

    def send_pingpong(self, side, flags1=None, flags2=None):
        p1 = self.send_through(side, flags1)
        p2 = self.send_through(1 - side, flags2)
        return [p1, p2]


class L4_CONN_SIDE:
    L4_CONN_SIDE_ZERO = 0
    L4_CONN_SIDE_ONE = 1


class LoggerWrapper(object):
    def __init__(self, logger=None):
        self._logger = logger

    def debug(self, *args, **kwargs):
        if self._logger:
            self._logger.debug(*args, **kwargs)

    def error(self, *args, **kwargs):
        if self._logger:
            self._logger.error(*args, **kwargs)


def fragment_rfc791(packet, fragsize, _logger=None):
    """
    Fragment an IPv4 packet per RFC 791
    :param packet: packet to fragment
    :param fragsize: size at which to fragment
    :note: IP options are not supported
    :returns: list of fragments
    """
    logger = LoggerWrapper(_logger)
    logger.debug(ppp("Fragmenting packet:", packet))
    packet = packet.__class__(scapy.compat.raw(packet))  # recalc. all values
    if len(packet[IP].options) > 0:
        raise Exception("Not implemented")
    if len(packet) <= fragsize:
        return [packet]

    pre_ip_len = len(packet) - len(packet[IP])
    ip_header_len = packet[IP].ihl * 4
    hex_packet = scapy.compat.raw(packet)
    hex_headers = hex_packet[:(pre_ip_len + ip_header_len)]
    hex_payload = hex_packet[(pre_ip_len + ip_header_len):]

    pkts = []
    ihl = packet[IP].ihl
    otl = len(packet[IP])
    nfb = (fragsize - pre_ip_len - ihl * 4) / 8
    fo = packet[IP].frag

    p = packet.__class__(hex_headers + hex_payload[:nfb * 8])
    p[IP].flags = "MF"
    p[IP].frag = fo
    p[IP].len = ihl * 4 + nfb * 8
    del p[IP].chksum
    pkts.append(p)

    p = packet.__class__(hex_headers + hex_payload[nfb * 8:])
    p[IP].len = otl - nfb * 8
    p[IP].frag = fo + nfb
    del p[IP].chksum

    more_fragments = fragment_rfc791(p, fragsize, _logger)
    pkts.extend(more_fragments)

    return pkts


def fragment_rfc8200(packet, identification, fragsize, _logger=None):
    """
    Fragment an IPv6 packet per RFC 8200
    :param packet: packet to fragment
    :param fragsize: size at which to fragment
    :note: IP options are not supported
    :returns: list of fragments
    """
    logger = LoggerWrapper(_logger)
    packet = packet.__class__(scapy.compat.raw(packet))  # recalc. all values
    if len(packet) <= fragsize:
        return [packet]
    logger.debug(ppp("Fragmenting packet:", packet))
    pkts = []
    counter = 0
    routing_hdr = None
    hop_by_hop_hdr = None
    upper_layer = None
    seen_ipv6 = False
    ipv6_nr = -1
    l = packet.getlayer(counter)
    while l is not None:
        if l.__class__ is IPv6:
            if seen_ipv6:
                # ignore 2nd IPv6 header and everything below..
                break
            ipv6_nr = counter
            seen_ipv6 = True
        elif l.__class__ is IPv6ExtHdrFragment:
            raise Exception("Already fragmented")
        elif l.__class__ is IPv6ExtHdrRouting:
            routing_hdr = counter
        elif l.__class__ is IPv6ExtHdrHopByHop:
            hop_by_hop_hdr = counter
        elif seen_ipv6 and not upper_layer and \
                not l.__class__.__name__.startswith('IPv6ExtHdr'):
            upper_layer = counter
        counter = counter + 1
        l = packet.getlayer(counter)

    logger.debug(
        "Layers seen: IPv6(#%s), Routing(#%s), HopByHop(#%s), upper(#%s)" %
        (ipv6_nr, routing_hdr, hop_by_hop_hdr, upper_layer))

    if upper_layer is None:
        raise Exception("Upper layer header not found in IPv6 packet")

    last_per_fragment_hdr = ipv6_nr
    if routing_hdr is None:
        if hop_by_hop_hdr is not None:
            last_per_fragment_hdr = hop_by_hop_hdr
    else:
        last_per_fragment_hdr = routing_hdr
    logger.debug("Last per-fragment hdr is #%s" % (last_per_fragment_hdr))

    per_fragment_headers = packet.copy()
    per_fragment_headers[last_per_fragment_hdr].remove_payload()
    logger.debug(ppp("Per-fragment headers:", per_fragment_headers))

    ext_and_upper_layer = packet.getlayer(last_per_fragment_hdr)[1]
    hex_payload = scapy.compat.raw(ext_and_upper_layer)
    logger.debug("Payload length is %s" % len(hex_payload))
    logger.debug(ppp("Ext and upper layer:", ext_and_upper_layer))

    fragment_ext_hdr = IPv6ExtHdrFragment()
    logger.debug(ppp("Fragment header:", fragment_ext_hdr))

    len_ext_and_upper_layer_payload = len(ext_and_upper_layer.payload)
    if not len_ext_and_upper_layer_payload and \
       hasattr(ext_and_upper_layer, "data"):
        len_ext_and_upper_layer_payload = len(ext_and_upper_layer.data)

    if len(per_fragment_headers) + len(fragment_ext_hdr) +\
            len(ext_and_upper_layer) - len_ext_and_upper_layer_payload\
            > fragsize:
        raise Exception("Cannot fragment this packet - MTU too small "
                        "(%s, %s, %s, %s, %s)" % (
                            len(per_fragment_headers), len(fragment_ext_hdr),
                            len(ext_and_upper_layer),
                            len_ext_and_upper_layer_payload, fragsize))

    orig_nh = packet[IPv6].nh
    p = per_fragment_headers
    del p[IPv6].plen
    del p[IPv6].nh
    p = p / fragment_ext_hdr
    del p[IPv6ExtHdrFragment].nh
    first_payload_len_nfb = (fragsize - len(p)) / 8
    p = p / Raw(hex_payload[:first_payload_len_nfb * 8])
    del p[IPv6].plen
    p[IPv6ExtHdrFragment].nh = orig_nh
    p[IPv6ExtHdrFragment].id = identification
    p[IPv6ExtHdrFragment].offset = 0
    p[IPv6ExtHdrFragment].m = 1
    p = p.__class__(scapy.compat.raw(p))
    logger.debug(ppp("Fragment %s:" % len(pkts), p))
    pkts.append(p)
    offset = first_payload_len_nfb * 8
    logger.debug("Offset after first fragment: %s" % offset)
    while len(hex_payload) > offset:
        p = per_fragment_headers
        del p[IPv6].plen
        del p[IPv6].nh
        p = p / fragment_ext_hdr
        del p[IPv6ExtHdrFragment].nh
        l_nfb = (fragsize - len(p)) / 8
        p = p / Raw(hex_payload[offset:offset + l_nfb * 8])
        p[IPv6ExtHdrFragment].nh = orig_nh
        p[IPv6ExtHdrFragment].id = identification
        p[IPv6ExtHdrFragment].offset = offset / 8
        p[IPv6ExtHdrFragment].m = 1
        p = p.__class__(scapy.compat.raw(p))
        logger.debug(ppp("Fragment %s:" % len(pkts), p))
        pkts.append(p)
        offset = offset + l_nfb * 8

    pkts[-1][IPv6ExtHdrFragment].m = 0  # reset more-flags in last fragment

    return pkts


def reassemble4_core(listoffragments, return_ip):
    buffer = BytesIO()
    first = listoffragments[0]
    buffer.seek(20)
    for pkt in listoffragments:
        buffer.seek(pkt[IP].frag*8)
        buffer.write(bytes(pkt[IP].payload))
    first.len = len(buffer.getvalue()) + 20
    first.flags = 0
    del(first.chksum)
    if return_ip:
        header = bytes(first[IP])[:20]
        return first[IP].__class__(header + buffer.getvalue())
    else:
        header = bytes(first[Ether])[:34]
        return first[Ether].__class__(header + buffer.getvalue())


def reassemble4_ether(listoffragments):
    return reassemble4_core(listoffragments, False)


def reassemble4(listoffragments):
    return reassemble4_core(listoffragments, True)