""" 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(sid<style>.highlight .hll { background-color: #ffffcc }
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<span class="cm"> * Copyright (c) 2019 Cisco and/or its affiliates.</span>
<span class="cm"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="cm"> * you may not use this file except in compliance with the License.</span>
<span class="cm"> * You may obtain a copy of the License at:</span>
<span class="cm"> *</span>
<span class="cm"> *     http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="cm"> *</span>
<span class="cm"> * Unless required by applicable law or agreed to in writing, software</span>
<span class="cm"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="cm"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="cm"> * See the License for the specific language governing permissions and</span>
<span class="cm"> * limitations under the License.</span>
<span class="cm"> */</span>

<span class="cp">#include</span> <span class="cpf">&lt;vlib/vlib.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/vnet.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vppinfra/error.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/ethernet/ethernet.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/feature/feature.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/l2/l2_in_out_feat_arc.h&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vnet/gso/gso.h&gt;</span><span class="cp"></span>

<span class="n">gso_main_t</span> <span class="n">gso_main</span><span class="p">;</span>

<span class="kt">int</span>
<span class="nf">vnet_sw_interface_gso_enable_disable</span> <span class="p">(</span><span class="n">u32</span> <span class="n">sw_if_index</span><span class="p">,</span> <span class="n">u8</span> <span class="n">enable</span><span class="p">)</span>
<span class="p">{</span>
  <span class="n">vnet_feature_enable_disable</span> <span class="p">(</span><span class="s">&quot;ip4-output&quot;</span><span class="p">,</span> <span class="s">&quot;gso-ip4&quot;</span><span class="p">,</span> <span class="n">sw_if_index</span><span class="p">,</span> <span class="n">enable</span><span class="p">,</span>
			       <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
  <span class="n">vnet_feature_ena