import socket

from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6
from scapy.layers.l2 import Ether, GRE
from scapy.packet import Raw

from framework import VppTestCase
from util import ppp
from vpp_ip_route import VppIpInterfaceAddress
from vpp_neighbor import VppNeighbor

""" TestPing is a subclass of  VPPTestCase classes.

Basic test for sanity check of the ping.

"""


class TestPing(VppTestCase):
    """ Ping Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestPing, cls).setUpClass()
        try:
            cls.create_pg_interfaces(range(2))
            cls.interfaces = list(cls.pg_interfaces)

            for i in cls.interfaces:
                i.admin_up()
                i.config_ip4()
                i.config_ip6()
                i.disable_ipv6_ra()
                i.resolve_arp()
                i.resolve_ndp()
        except Exception:
            super(TestPing, cls).tearDownClass()
            raise

    @classmethod
    def tearDownClass(cls):
        super(TestPing, cls).tearDownClass()

    def tearDown(self):
        super(TestPing, self).tearDown()

    def show_commands_at_teardown(self):
        self.logger.info(self.vapi.cli("show hardware"))

    def verify_ping_request(self, p, src, dst, seq):
        ip = p[IP]
        self.assertEqual(ip.version, 4)
        self.assertEqual(ip.flags, 0)
        self.assertEqual(ip.src, src)
        self.assertEqual(ip.dst, dst)
        self.assertEqual(ip.proto, 1)
        self.assertEqual(len(ip.options), 0)
        self.assertGreaterEqual(ip.ttl, 254)
        icmp = p[ICMP]
        self.assertEqual(icmp.type, 8)
        self.assertEqual(icmp.code, 0)
        self.assertEqual(icmp.seq, seq)
        return icmp

    def test_ping_basic(self):
        """ basic ping test """
        try:
            self.pg_enable_capture(self.pg_interfaces)
            self.pg_start()
            self.logger.info(self.vapi.cli("show ip4 neighbors"))
            self.logger.info(self.vapi.cli("show ip6 neighbors"))

            remote_ip4 = self.pg1.remote_ip4
            ping_cmd = "ping " + remote_ip4 + " interval 0.01 repeat 10"
            ret = self.vapi.cli(ping_cmd)
            self.logger.info(ret)
            out = self.pg1.get_capture(10)
            icmp_id = None
            icmp_seq = 1
            for p in out:
                icmp = self.verify_ping_request(p, self.pg1.local_ip4,
                                                self.pg1.remote_ip4, icmp_seq)
                icmp_seq = icmp_seq + 1
                if icmp_id is None:
                    icmp_id = icmp.id
                else:
                    self.assertEqual(icmp.id, icmp_id)
        finally:
            self.vapi.cli("show error")

    def test_ping_burst(self):
        """ burst ping test """
        try:
            self.pg_enable_capture(self.pg_interfaces)
            self.pg_start()
            self.logger.info(self.vapi.cli("show ip neighbors"))

            remote_ip4 = self.pg1.remote_ip4
            ping_cmd = "ping " + remote_ip4 + " interval 0.01 burst 3"
            ret = self.vapi.cli(ping_cmd)
            self.logger.info(ret)
            out = self.pg1.get_capture(3*5)
            icmp_id = None
            icmp_seq = 1
            count = 0
            for p in out:
                icmp = self.verify_ping_request(p, self.pg1.local_ip4,
                                                self.pg1.remote_ip4, icmp_seq)
                count = count + 1
                if count >= 3:
                    icmp_seq = icmp_seq + 1
                    count = 0
                if icmp_id is None:
                    icmp_id = icmp.id
                else:
                    self.assertEqual(icmp.id, icmp_id)
        finally:
            self.vapi.cli("show error")

    def test_ping_src(self):
        """ ping with source address set """

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        self.logger.info(self.vapi.cli("show ip4 neighbors"))
        self.logger.info(self.vapi.cli("show ip6 neighbors"))

        nbr_addr = "10.0.0.2"
        VppIpInterfaceAddress(self, self.pg1, "10.0.0.1", 24).add_vpp_config()
        VppNeighbor(self, self.pg1.sw_if_index,
                    "00:11:22:33:44:55",
                    nbr_addr).add_vpp_config()

        ping_cmd = "ping %s interval 0.01 repeat 3" % self.pg1.remote_ip4
        ret = self.vapi.cli(ping_cmd)
        out = self.pg1.get_capture(3)
        icmp_seq = 1
        for p in out:
            icmp = self.verify_ping_request(p, self.pg1.local_ip4,
                                            self.pg1.remote_ip4, icmp_seq)
            icmp_seq = icmp_seq + 1

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        ping_cmd = "ping %s interval 0.01 repeat 3" % nbr_addr
        ret = self.vapi.cli(ping_cmd)
        out = self.pg1.get_capture(3)
        icmp_seq = 1
        for p in out:
            icmp = self.verify_ping_request(p, "10.0.0.1", nbr_addr, icmp_seq)
            icmp_seq = icmp_seq + 1