import socket
import unittest
from scapy.layers.ipsec import ESP
from scapy.layers.inet import UDP

from framework import VppTestRunner
from template_ipsec import IpsecTra46Tests, IpsecTun46Tests, TemplateIpsec, \
    IpsecTcpTests, IpsecTun4Tests, IpsecTra4Tests, config_tra_params
from vpp_ipsec import VppIpsecSpd, VppIpsecSpdEntry, VppIpsecSA,\
        VppIpsecSpdItfBinding
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_ip import DpoProto
from vpp_papi import VppEnum


def config_esp_tun(test, params):
    addr_type = params.addr_type
    scapy_tun_sa_id = params.scapy_tun_sa_id
    scapy_tun_spi = params.scapy_tun_spi
    vpp_tun_sa_id = params.vpp_tun_sa_id
    vpp_tun_spi = params.vpp_tun_spi
    auth_algo_vpp_id = params.auth_algo_vpp_id
    auth_key = params.auth_key
    crypt_algo_vpp_id = params.crypt_algo_vpp_id
    crypt_key = params.crypt_key
    remote_tun_if_host = params.remote_tun_if_host
    addr_any = params.addr_any
    addr_bcast = params.addr_bcast
    e = VppEnum.vl_api_ipsec_spd_action_t

    params.tun_sa_in = VppIpsecSA(test, scapy_tun_sa_id, scapy_tun_spi,
                                  auth_algo_vpp_id, auth_key,
                                  crypt_algo_vpp_id, crypt_key,
                                  test.vpp_esp_protocol,
                                  test.tun_if.local_addr[addr_type],
                                  test.tun_if.remote_addr[addr_type])
    params.tun_sa_in.add_vpp_config()
    params.tun_sa_out = VppIpsecSA(test, vpp_tun_sa_id, vpp_tun_spi,
                                   auth_algo_vpp_id, auth_key,
                                   crypt_algo_vpp_id, crypt_key,
                                   test.vpp_esp_protocol,
                                   test.tun_if.remote_addr[addr_type],
                                   test.tun_if.local_addr[addr_type])
    params.tun_sa_out.add_vpp_config()

    params.spd_policy_in_any = VppIpsecSpdEntry(test, test.tun_spd,
                                                scapy_tun_sa_id,
                                                addr_any, addr_bcast,
                                                addr_any, addr_bcast,
                                                socket.IPPROTO_ESP)
    params.spd_policy_in_any.add_vpp_config()
    params.spd_policy_out_any = VppIpsecSpdEntry(test, test.tun_spd,
                                                 scapy_tun_sa_id,
                                                 addr_any, addr_bcast,
                                                 addr_any, addr_bcast,
                                                 socket.IPPROTO_ESP,
                                                 is_outbound=0)
    params.spd_policy_out_any.add_vpp_config()

    VppIpsecSpdEntry(test, test.tun_spd, vpp_tun_sa_id,
                     remote_tun_if_host, remote_tun_if_host,
                     test.pg1.remote_addr[addr_type],
                     test.pg1.remote_addr[addr_type],
                     0,
                     priority=10,
                     policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     is_outbound=0).add_vpp_config()
    VppIpsecSpdEntry(test, test.tun_spd, scapy_tun_sa_id,
                     test.pg1.remote_addr[addr_type],
                     test.pg1.remote_addr[addr_type],
                     remote_tun_if_host, remote_tun_if_host,
                     0,
                     policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     priority=10).add_vpp_config()

    VppIpsecSpdEntry(test, test.tun_spd, vpp_tun_sa_id,
                     remote_tun_if_host, remote_tun_if_host,
                     test.pg0.local_addr[addr_type],
                     test.pg0.local_addr[addr_type],
                     0,
                     priority=20,
                     policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     is_outbound=0).add_vpp_config()
    VppIpsecSpdEntry(test, test.tun_spd, scapy_tun_sa_id,
                     test.pg0.local_addr[addr_type],
                     test.pg0.local_addr[addr_type],
                     remote_tun_if_host, remote_tun_if_host,
                     0,
                     policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     priority=20).add_vpp_config()


def config_esp_tra(test, params):
    addr_type = params.addr_type
    scapy_tra_sa_id = params.scapy_tra_sa_id
    scapy_tra_spi = params.scapy_tra_spi
    vpp_tra_sa_id = params.vpp_tra_sa_id
    vpp_tra_spi = params.vpp_tra_spi
    auth_algo_vpp_id = params.auth_algo_vpp_id
    auth_key = params.auth_key
    crypt_algo_vpp_id = params.crypt_algo_vpp_id
    crypt_key = params.crypt_key
    addr_any = params.addr_any
    addr_bcast = params.addr_bcast
    flags = (VppEnum.vl_api_ipsec_sad_flags_t.
             IPSEC_API_SAD_FLAG_USE_ANTI_REPLAY)
    e = VppEnum.vl_api_ipsec_spd_action_t
    flags = params.flags | flags

    params.tra_sa_in = VppIpsecSA(test, scapy_tra_sa_id, scapy_tra_spi,
                                  auth_algo_vpp_id, auth_key,
                                  crypt_algo_vpp_id, crypt_key,
                                  test.vpp_esp_protocol,
                                  flags=flags)
    params.tra_sa_in.add_vpp_config()
    params.tra_sa_out = VppIpsecSA(test, vpp_tra_sa_id, vpp_tra_spi,
                                   auth_algo_vpp_id, auth_key,
                                   crypt_algo_vpp_id, crypt_key,
                                   test.vpp_esp_protocol,
                                   flags=flags)
    params.tra_sa_out.add_vpp_config()

    VppIpsecSpdEntry(test, test.tra_spd, vpp_tra_sa_id,
                     addr_any, addr_bcast,
                     addr_any, addr_bcast,
                     socket.IPPROTO_ESP).add_vpp_config()
    VppIpsecSpdEntry(test, test.tra_spd, vpp_tra_sa_id,
                     addr_any, addr_bcast,
                     addr_any, addr_bcast,
                     socket.IPPROTO_ESP,
                     is_outbound=0).add_vpp_config()

    VppIpsecSpdEntry(test, test.tra_spd, vpp_tra_sa_id,
                     test.tra_if.local_addr[addr_type],
                     test.tra_if.local_addr[addr_type],
                     test.tra_if.remote_addr[addr_type],
                     test.tra_if.remote_addr[addr_type],
                     0, priority=10,
                     policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     is_outbound=0).add_vpp_config()
    VppIpsecSpdEntry(test, test.tra_spd, scapy_tra_sa_id,
                     test.tra_if.local_addr[addr_type],
                     test.tra_if.local_addr[addr_type],
                     test.tra_if.remote_addr[addr_type],
                     test.tra_if.remote_addr[addr_type],
                     0, policy=e.IPSEC_API_SPD_ACTION_PROTECT,
                     priority=10).add_vpp_config()


class TemplateIpsecEsp(TemplateIpsec):
    """
    Basic test for ipsec esp sanity - tunnel and transport modes.

    Below 4 cases are covered as part of this test
    1) ipsec esp v4 transport basic test  - IPv4 Transport mode
        scenario using HMAC-SHA1-96 integrity algo
    2) ipsec esp v4 transport burst test
        Above test for 257 pkts
    3) ipsec esp 4o4 tunnel basic test    - IPv4 Tunnel mode
        scenario using HMAC-SHA1-96 integrity algo
    4) ipsec esp 4o4 tunnel burst test
        Above test for 257 pkts

    TRANSPORT MODE:

     ---   encrypt   ---
    |pg2| <-------> |VPP|
     ---   decrypt   ---

    TUNNEL MODE:

     ---   encrypt   ---   plain   ---
    |pg0| <-------  |VPP| <------ |pg1|
     ---             ---           ---

     ---   decrypt   ---   plain   ---
    |pg0| ------->  |VPP| ------> |pg1|
     ---             ---           ---
    """

    def setUp(self):
        super(TemplateIpsecEsp, self).setUp()
        self.encryption_type = ESP
        self.tun_if = self.pg0
        self.tra_if = self.pg2
        self.logger.info(self.vapi.ppcli("show int addr"))

        self.tra_spd = VppIpsecSpd(self, self.tra_spd_id)
        self.tra_spd.add_vpp_config()
        VppIpsecSpdItfBinding(self, self.tra_spd,
                              self.tra_if).add_vpp_config()

        for _, p in self.params.items():
            config_esp_tra(self, p)
            config_tra_params(p, self.encryption_type)
        self.logger.info(self.vapi.ppcli("show ipsec"))

        self.tun_spd = VppIpsecSpd(self, self.tun_spd_id)
        self.tun_spd.add_vpp_config()
        VppIpsecSpdItfBinding(self, self.tun_spd,
                              self.tun_if).add_vpp_config()

        for _, p in self.params.items():
            config_esp_tun(self, p)
        self.logger.info(self.vapi.ppcli("show ipsec"))

        for _, p in self.params.items():
            d = DpoProto.DPO_PROTO_IP6 if p.is_ipv6 else DpoProto.DPO_PROTO_IP4
            VppIpRoute(self,  p.remote_tun_if_host, p.addr_len,
                       [VppRoutePath(self.tun_if.remote_addr[p.addr_type],
                                     0xffffffff,
                                     proto=d)],
                       is_ip6=p.is_ipv6).add_vpp_config()

    def tearDown(self):
        super(TemplateIpsecEsp, self).tearDown()
        if not self.vpp_dead:
            self.vapi.cli("show hardware")


class TestIpsecEsp1(TemplateIpsecEsp, IpsecTra46Tests, IpsecTun46Tests):
    """ Ipsec ESP - TUN & TRA tests """
    tra4_encrypt_node_name = "esp4-encrypt"
    tra4_decrypt_node_name = "esp4-decrypt"
    tra6_encrypt_node_name = "esp6-encrypt"
    tra6_decrypt_node_name = "esp6-decrypt"
    tun4_encrypt_node_name = "esp4-encrypt"
    tun4_decrypt_node_name = "esp4-decrypt"
    tun6_encrypt_node_name = "esp6-encrypt"
    tun6_decrypt_node_name = "esp6-decrypt"


class TestIpsecEsp2(TemplateIpsecEsp, IpsecTcpTests):
    """ Ipsec ESP - TCP tests """
    pass


class TemplateIpsecEspUdp(TemplateIpsec):
    """
    UDP encapped ESP
    """
    def setUp(self):
        super(TemplateIpsecEspUdp, self).setUp()
        self.encryption_type = ESP
        self.tun_if = self.pg0
        self.tra_if = self.pg2
        self.logger.info(self.vapi.ppcli("show int addr"))

        p = self.ipv4_params
        p.flags = (VppEnum.vl_api_ipsec_sad_flags_t.
                   IPSEC_API_SAD_FLAG_UDP_ENCAP)
        p.nat_header = UDP(sport=5454, dport=4500)

        self.tra_spd = VppIpsecSpd(self, self.tra_spd_id)
        self.tra_spd.add_vpp_config()
        VppIpsecSpdItfBinding(self, self.tra_spd,
                              self.tra_if).add_vpp_config()

        config_esp_tra(self, p)
        config_tra_params(p, self.encryption_type)

        self.tun_spd = VppIpsecSpd(self, self.tun_spd_id)
        self.tun_spd.add_vpp_config()
        VppIpsecSpdItfBinding(self, self.tun_spd,
                              self.tun_if).add_vpp_config()

        config_esp_tun(self, p)
        self.logger.info(self.vapi.ppcli("show ipsec"))

        d = DpoProto.DPO_PROTO_IP4
        VppIpRoute(self,  p.remote_tun_if_host, p.addr_len,
                   [VppRoutePath(self.tun_if.remote_addr[p.addr_type],
                                 0xffffffff,
                                 proto=d)]).add_vpp_config()

    def tearDown(self):
        super(TemplateIpsecEspUdp, self).tearDown()
        if not self.vpp_dead:
            self.vapi.cli("show hardware")


class TestIpsecEspUdp(TemplateIpsecEspUdp, IpsecTra4Tests, IpsecTun4Tests):
    """ Ipsec NAT-T ESP UDP tests """
    tra4_encrypt_node_name = "esp4-encrypt"
    tra4_decrypt_node_name = "esp4-decrypt"
    tun4_encrypt_node_name = "esp4-encrypt"
    tun4_decrypt_node_name = "esp4-decrypt"
    pass


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)