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

"""IPsec utilities library."""

import os
from random import choice
from string import letters
from ipaddress import ip_network, ip_address

from enum import Enum, IntEnum

from resources.libraries.python.PapiExecutor import PapiSocketExecutor
from resources.libraries.python.topology import Topology
from resources.libraries.python.VatExecutor import VatExecutor
from resources.libraries.python.VatJsonUtil import VatJsonUtil


def gen_key(length):
    """Generate random string as a key.

    :param length: Length of generated payload.
    :type length: int
    :returns: The generated payload.
    :rtype: str
    """
    return ''.join(choice(letters) for _ in range(length)).encode('hex')

class PolicyAction(Enum):
    """Policy actions."""
    BYPASS = 'bypass'
    DISCARD = 'discard'
    PROTECT = 'protect'

    def __init__(self, string):
        self.string = string


class CryptoAlg(Enum):
    """Encryption algorithms."""
    AES_CBC_128 = ('aes-cbc-128', 'AES-CBC', 16)
    AES_CBC_256 = ('aes-cbc-256', 'AES-CBC', 32)
    AES_GCM_128 = ('aes-gcm-128', 'AES-GCM', 16)
    AES_GCM_256 = ('aes-gcm-256', 'AES-GCM', 32)

    def __init__(self, alg_name, scapy_name, key_len):
        self.alg_name = alg_name
        self.scapy_name = scapy_name
        self.key_len = key_len


class IntegAlg(Enum):
    """Integrity algorithm."""
    SHA_256_128 = ('sha-256-128', 'SHA2-256-128', 32)
    SHA_512_256 = ('sha-512-256', 'SHA2-512-256', 64)
    AES_GCM_128 = ('aes-gcm-128', 'AES-GCM', 16)
    AES_GCM_256 = ('aes-gcm-256', 'AES-GCM', 32)

    def __init__(self, alg_name, scapy_name, key_len):
        self.alg_name = alg_name
        self.scapy_name = scapy_name
        self.key_len = key_len


class IPsecProto(IntEnum):
    """IPsec protocol."""
    ESP = 1
    SEC_AH = 0


class IPsecUtil(object):
    """IPsec utilities."""

    @staticmethod
    def policy_action_bypass():
        """Return policy action bypass.

        :returns: PolicyAction enum BYPASS object.
        :rtype: PolicyAction
        """
        return PolicyAction.BYPASS

    @staticmethod
    def policy_action_discard():
        """Return policy action discard.

        :returns: PolicyAction enum DISCARD object.
        :rtype: PolicyAction
        """
        return PolicyAction.DISCARD

    @staticmethod
    def policy_action_protect():
        """Return policy action protect.

        :returns: PolicyAction enum PROTECT object.
        :rtype: PolicyAction
        """
        return PolicyAction.PROTECT

    @staticmethod
    def crypto_alg_aes_cbc_128():
        """Return encryption algorithm aes-cbc-128.

        :returns: CryptoAlg enum AES_CBC_128 object.
        :rtype: CryptoAlg
        """
        return CryptoAlg.AES_CBC_128

    @staticmethod
    def crypto_alg_aes_cbc_256():
        """Return encryption algorithm aes-cbc-256.

        :returns: CryptoAlg enum AES_CBC_256 object.
        :rtype: CryptoAlg
        """
        return CryptoAlg.AES_CBC_256

    @staticmethod
    def crypto_alg_aes_gcm_128():
        """Return encryption algorithm aes-gcm-128.

        :returns: CryptoAlg enum AES_GCM_128 object.
        :rtype: CryptoAlg
        """
        return CryptoAlg.AES_GCM_128

    @staticmethod
    def crypto_alg_aes_gcm_256():
        """Return encryption algorithm aes-gcm-256.

        :returns: CryptoAlg enum AES_GCM_128 object.
        :rtype: CryptoAlg
        """
        return CryptoAlg.AES_GCM_256

    @staticmethod
    def get_crypto_alg_key_len(crypto_alg):
        """Return encryption algorithm key length.

        :param crypto_alg: Encryption algorithm.
        :type crypto_alg: CryptoAlg
        :returns: Key length.
        :rtype: int
        """
        return crypto_alg.key_len

    @staticmethod
    def get_crypto_alg_scapy_name(crypto_alg):
        """Return encryption algorithm scapy name.

        :param crypto_alg: Encryption algorithm.
        :type crypto_alg: CryptoAlg
        :returns: Algorithm scapy name.
        :rtype: str
        """
        return crypto_alg.scapy_name

    @staticmethod
    def integ_alg_sha_256_128():
        """Return integrity algorithm SHA-256-128.

        :returns: IntegAlg enum SHA_256_128 object.
        :rtype: IntegAlg
        """
        return IntegAlg.SHA_256_128

    @staticmethod
    def integ_alg_sha_512_256():
        """Return integrity algorithm SHA-512-256.

        :returns: IntegAlg enum SHA_512_256 object.
        :rtype: IntegAlg
        """
        return IntegAlg.SHA_512_256

    @staticmethod
    def integ_alg_aes_gcm_128():
        """Return integrity algorithm AES-GCM-128.

        :returns: IntegAlg enum AES_GCM_128 object.
        :rtype: IntegAlg
        """
        return IntegAlg.AES_GCM_128

    @staticmethod
    def integ_alg_aes_gcm_256():
        """Return integrity algorithm AES-GCM-256.

        :returns: IntegAlg enum AES_GCM_256 object.
        :rtype: IntegAlg
        """
        return IntegAlg.AES_GCM_256

    @staticmethod
    def get_integ_alg_key_len(integ_alg):
        """Return integrity algorithm key length.

        :param integ_alg: Integrity algorithm.
        :type integ_alg: IntegAlg
        :returns: Key length.
        :rtype: int
        """
        return integ_alg.key_len

    @staticmethod
    def get_integ_alg_scapy_name(integ_alg):
        """Return integrity algorithm scapy name.

        :param integ_alg: Integrity algorithm.
        :type integ_alg: IntegAlg
        :returns: Algorithm scapy name.
        :rtype: str
        """
        return integ_alg.scapy_name

    @staticmethod
    def ipsec_proto_esp():
        """Return IPSec protocol ESP.

        :returns: IPsecProto enum ESP object.
        :rtype: IPsecProto
        """
        return int(IPsecProto.ESP)

    @staticmethod
    def ipsec_proto_ah():
        """Return IPSec protocol AH.

        :returns: IPsecProto enum AH object.
        :rtype: IPsecProto
        """
        return int(IPsecProto.SEC_AH)

    @staticmethod
    def vpp_ipsec_select_backend(node, protocol, index=1):
        """Select IPsec backend.

        :param node: VPP node to select IPsec backend on.
        :param protocol: IPsec protocol.
        :param index: Backend index.
        :type node: dict
        :type protocol: IPsecProto
        :type index: int
        :raises RuntimeError: If failed to select IPsec backend or if no API
            reply received.
        """

        cmd = 'ipsec_select_backend'
        err_msg = 'Failed to select IPsec backend on host {host}'.format(
            host=node['host'])
        args = dict(protocol=protocol, index=index)
        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_reply(err_msg)

    @staticmethod
    def vpp_ipsec_backend_dump(node):
        """Dump IPsec backends.

        :param node: VPP node to dump IPsec backend on.
        :type node: dict
        """

        err_msg = 'Failed to dump IPsec backends on host {host}'.format(
            host=node['host'])
        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add('ipsec_backend_dump').get_details(err_msg)

    @staticmethod
    def vpp_ipsec_add_sad_entry(node, sad_id, spi, crypto_alg, crypto_key,
                                integ_alg, integ_key, tunnel_src=None,
                                tunnel_dst=None):
        """Create Security Association Database entry on the VPP node.

        :param node: VPP node to add SAD entry on.
        :param sad_id: SAD entry ID.
        :param spi: Security Parameter Index of this SAD entry.
        :param crypto_alg: The encryption algorithm name.
        :param crypto_key: The encryption key string.
        :param integ_alg: The integrity algorithm name.
        :param integ_key: The integrity key string.
        :param tunnel_src: Tunnel header source IPv4 or IPv6 address. If not
            specified ESP transport mode is used.
        :param tunnel_dst: Tunnel header destination IPv4 or IPv6 address. If
            not specified ESP transport mode is used.
        :type node: dict
        :type sad_id: int
        :type spi: int
        :type crypto_alg: CryptoAlg
        :type crypto_key: str
        :type integ_alg: IntegAlg
        :type integ_key: str
        :type tunnel_src: str
        :type tunnel_dst: str
        """
        ckey = crypto_key.encode('hex')
        ikey = integ_key.encode('hex')
        tunnel = 'tunnel-src {0} tunnel-dst {1}'.format(tunnel_src, tunnel_dst)\
            if tunnel_src is not None and tunnel_dst is not None else ''

        out = VatExecutor.cmd_from_template(node,
                                            'ipsec/ipsec_sad_add_entry.vat',
                                            sad_id=sad_id, spi=spi,
                                            calg=crypto_alg.alg_name, ckey=ckey,
                                            ialg=integ_alg.alg_name, ikey=ikey,
                                            tunnel=tunnel)
        VatJsonUtil.verify_vat_retval(
            out[0],
            err_msg='Add SAD entry failed on {0}'.format(node['host']))

    @staticmethod
    def vpp_ipsec_add_sad_entries(node, n_entries, sad_id, spi, crypto_alg,
                                  crypto_key, integ_alg, integ_key,
                                  tunnel_src=None, tunnel_dst=None):
        """Create multiple Security Association Database entries on VPP node.

        :param node: VPP node to add SAD entry on.
        :param n_entries: Number of SAD entries to be created.
        :param sad_id: First SAD entry ID. All subsequent SAD entries will have
            id incremented by 1.
        :param spi: Security Parameter Index of first SAD entry. All subsequent
            SAD entries will have spi incremented by 1.
        :param crypto_alg: The encryption algorithm name.
        :param crypto_key: The encryption key string.
        :param integ_alg: The integrity algorithm name.
        :param integ_key: The integrity key string.
        :param tunnel_src: Tunnel header source IPv4 or IPv6 address. If not
            specified ESP transport mode is used.
        :param tunnel_dst: Tunnel header destination IPv4 or IPv6 address. If
            not specified ESP transport mode is used.
        :type node: dict
        :type n_entries: int
        :type sad_id: int
        :type spi: int
        :type crypto_alg: CryptoAlg
        :type crypto_key: str
        :type integ_alg: IntegAlg
        :type integ_key: str
        :type tunnel_src: str
        :type tunnel_dst: str
        """
        tmp_filename = '/tmp/ipsec_sad_{0}_add_del_entry.script'.format(sad_id)

        addr_incr = 1 << (32 - 24)

        with open(tmp_filename, 'w') as tmp_file:
            for i in range(0, n_entries):
                integ = ''
                if not crypto_alg.alg_name.startswith('aes-gcm-'):
                    integ = (
                        'integ-alg {integ_alg} integ-key {integ_key}'.
                        format(
                            integ_alg=integ_alg.alg_name,
                            integ_key=integ_key))
                tunnel = (
                    'tunnel-src {laddr} tunnel-dst {raddr}'.
                    format(
                        laddr=ip_address(unicode(tunnel_src)) + i * addr_incr,
                        raddr=ip_address(unicode(tunnel_dst)) + i * addr_incr)
                    if tunnel_src and tunnel_dst is not None else '')
                conf = (
                    'exec ipsec sa add {sad_id} esp spi {spi} '
                    'crypto-alg {crypto_alg} crypto-key {crypto_key} '
                    '{integ} {tunnel}\n'.
                    format(
                        sad_id=sad_id + i,
                        spi=spi + i,
                        crypto_alg=crypto_alg.alg_name,
                        crypto_key=crypto_key,
                        integ=integ,
                        tunnel=tunnel))
                tmp_file.write(conf)
        vat = VatExecutor()
        vat.execute_script(tmp_filename, node, timeout=300, json_out=False,
                           copy_on_execute=True)
        os.remove(tmp_filename)

    @staticmethod
    def vpp_ipsec_set_ip_route(node, n_tunnels, tunnel_src, traffic_addr,
                               tunnel_dst, interface, raddr_range):
        """Set IP address and route on interface.

        :param node: VPP node to add config on.
        :param n_tunnels: Number of tunnels to create.
        :param tunnel_src: Tunnel header source IPv4 or IPv6 address.
        :param traffic_addr: Traffic destination IP address to route.
        :param tunnel_dst: Tunnel header destination IPv4 or IPv6 address.
        :param interface: Interface key on node 1.
        :param raddr_range: Mask specifying range of Policy selector Remote IPv4
            addresses. Valid values are from 1 to 32.
        :type node: dict
        :type n_tunnels: int
        :type tunnel_src: str
        :type traffic_addr: str
        :type tunnel_dst: str
        :type interface: str
        :type raddr_range: int
        """
        tmp_filename = '/tmp/ipsec_set_ip.script'

        addr_incr = 1 << (32 - raddr_range)

        with open(tmp_filename, 'w') as tmp_file:
            for i in range(0, n_tunnels):
                conf = (
                    'exec set interface ip address {interface} {laddr}/24\n'
                    'exec ip route add {taddr}/32 via {raddr} {interface}\n'.
                    format(
                        interface=Topology.get_interface_name(node, interface),
                        laddr=ip_address(unicode(tunnel_src)) + i * addr_incr,
                        raddr=ip_address(unicode(tunnel_dst)) + i * addr_incr,
                        taddr=ip_address(unicode(traffic_addr)) + i))
                tmp_file.write(conf)
        vat = VatExecutor()
        vat.execute_script(tmp_filename, node, timeout=300, json_out=False,
                           copy_on_execute=True)
        os.remove(tmp_filename)

    @staticmethod
    def vpp_ipsec_sa_set_key(node, sa_id, crypto_key, integ_key):
        """Update Security Association (SA) keys.

        :param node: VPP node to update SA keys.
        :param sa_id: SAD entry ID.
        :param crypto_key: The encryption key string.
        :param integ_key: The integrity key string.
        :type node: dict
        :type sa_id: int
        :type crypto_key: str
        :type integ_key: str
        """
        ckey = crypto_key.encode('hex')
        ikey = integ_key.encode('hex')

        out = VatExecutor.cmd_from_template(
            node, 'ipsec/ipsec_sa_set_key.vat', json_param=False, sa_id=sa_id,
            ckey=ckey, ikey=ikey)
        VatJsonUtil.verify_vat_retval(
            out[0],
            err_msg='Update SA key failed on {0}'.format(node['host']))

    @staticmethod
    def vpp_ipsec_add_spd(node, spd_id):
        """Create Security Policy Database on the VPP node.

        :param node: VPP node to add SPD on.
        :param spd_id: SPD ID.
        :type node: dict
        :type spd_id: int
        """
        out = VatExecutor.cmd_from_template(node, 'ipsec/ipsec_spd_add.vat',
                                            spd_id=spd_id)
        VatJsonUtil.verify_vat_retval(
            out[0],
            err_msg='Add SPD {0} failed on {1}'.format(spd_id, node['host']))

    @staticmethod
    def vpp_ipsec_spd_add_if(node, spd_id, interface):
        """Add interface to the Security Policy Database.

        :param node: VPP node.
        :param spd_id: SPD ID to add interface on.
        :param interface: Interface name or sw_if_index.
        :type node: dict
        :type spd_id: int
        :type interface: str or int
        """
        sw_if_index = Topology.get_interface_sw_index(node, interface)\
            if isinstance(interface, basestring) else interface

        out = VatExecutor.cmd_from_template(node,
                                            'ipsec/ipsec_interface_add_spd.vat',
                                            spd_id=spd_id, sw_if_id=sw_if_index)
        VatJsonUtil.verify_vat_retval(
            out[0],
            err_msg='Add interface {0} to SPD {1} failed on {2}'.format(
                interface, spd_id, node['host']))

    @staticmethod
    def vpp_ipsec_policy_add(node, spd_id, priority, action, inbound=True,
                             sa_id=None, laddr_range=None, raddr_range=None,
                             proto=None, lport_range=None, rport_range=None,
                             is_ipv6=False):
        """Create Security Policy Database entry on the VPP node.

        :param node: VPP node to add SPD entry on.
        :param spd_id: SPD ID to add entry on.
        :param priority: SPD entry priority, higher number = higher priority.
        :param action: Policy action.
        :param inbound: If True policy is for inbound traffic, otherwise
            outbound.
        :param sa_id: SAD entry ID for protect action.
        :param laddr_range: Policy selector local IPv4 or IPv6 address range in
            format IP/prefix or IP/mask. If no mask is provided,
            it's considered to be /32.
        :param raddr_range: Policy selector remote IPv4 or IPv6 address range in
            format IP/prefix or IP/mask. If no mask is provided,
            it's considered to be /32.
        :param proto: Policy selector next layer protocol number.
        :param lport_range: Policy selector local TCP/UDP port range in format
            <port_start>-<port_end>.
        :param rport_range: Policy selector remote TCP/UDP port range in format
            <port_start>-<port_end>.
        :param is_ipv6: True in case of IPv6 policy when IPv6 address range is
            not defined so it will default to address ::/0, otherwise False.
        :type node: dict
        :type spd_id: int
        :type priority: int
        :type action: PolicyAction
        :type inbound: bool
        :type sa_id: int
        :type laddr_range: string
        :type raddr_range: string
        :type proto: int
        :type lport_range: string
        :type rport_range: string
        :type is_ipv6: bool
        """
        direction = 'inbound' if inbound else 'outbound'

        if laddr_range is None and is_ipv6:
            laddr_range = '::/0'

        if raddr_range is None and is_ipv6:
            raddr_range = '::/0'

        act_str = action.value
        if PolicyAction.PROTECT == action and sa_id is not None:
            act_str += ' sa {0}'.format(sa_id)

        selector = ''
        if laddr_range is not None:
            net = ip_network(unicode(laddr_range), strict=False)
            selector += 'local-ip-range {0} - {1} '.format(
                net.network_address, net.broadcast_address)
        if raddr_range is not None:
            net = ip_network(unicode(raddr_range), strict=False)
            selector += 'remote-ip-range {0} - {1} '.format(
                net.network_address, net.broadcast_address)
        if proto is not None:
            selector += 'protocol {0} '.format(proto)
        if lport_range is not None:
            selector += 'local-port-range {0} '.format(lport_range)
        if rport_range is not None:
            selector += 'remote-port-range {0} '.format(rport_range)

        out = VatExecutor.cmd_from_template(
            node, 'ipsec/ipsec_policy_add.vat', json_param=False, spd_id=spd_id,
            priority=priority, action=act_str, direction=direction,
            selector=selector)
        VatJsonUtil.verify_vat_retval(
            out[0],
            err_msg='Add IPsec policy ID {0} failed on {1}'.format(
                spd_id, node['host']))

    @staticmethod
    def vpp_ipsec_spd_add_entries(node, n_entries, spd_id, priority, inbound,
                                  sa_id, raddr_ip):
        """Create multiple Security Policy Database entries on the VPP node.

        :param node: VPP node to add SPD entries on.
        :param n_entries: Number of SPD entries to be added.
        :param spd_id: SPD ID to add entries on.
        :param priority: SPD entries priority, higher number = higher priority.
        :param inbound: If True policy is for inbound traffic, otherwise
            outbound.
        :param sa_id: SAD entry ID for first entry. Each subsequent entry will
            SAD entry ID incremented by 1.
        :param raddr_ip: Policy selector remote IPv4 start address for the first
            entry. Remote IPv4 end address will be calculated depending on
            raddr_range parameter. Each subsequent entry will have start address
            next after IPv4 end address of previous entry.
        :type node: dict
        :type n_entries: int
        :type spd_id: int
        :type priority: int
        :type inbound: bool
        :type sa_id: int
        :type raddr_ip: string
        """
        tmp_filename = '/tmp/ipsec_spd_{0}_add_del_entry.script'.format(sa_id)

        with open(tmp_filename, 'w') as tmp_file:
            for i in range(0, n_entries):
                raddr_s = ip_address(unicode(raddr_ip)) + i
                raddr_e = ip_address(unicode(raddr_ip)) + (i + 1) - 1
                tunnel = (
                    'exec ipsec policy add spd {spd_id} priority {priority} '
                    '{direction} action protect sa {sa_id} '
                    'remote-ip-range {raddr_s} - {raddr_e} '
                    'local-ip-range 0.0.0.0 - 255.255.255.255\n'.
                    format(
                        spd_id=spd_id,
                        priority=priority,
                        direction='inbound' if inbound else 'outbound',
                        sa_id=sa_id+i,
                        raddr_s=raddr_s,
                        raddr_e=raddr_e))
                tmp_file.write(tunnel)
        vat = VatExecutor()
        vat.execute_script(tmp_filename, node, timeout=300, json_out=False,
                           copy_on_execute=True)
        os.remove(tmp_filename)

    @staticmethod
    def vpp_ipsec_create_tunnel_interfaces(nodes, if1_ip_addr, if2_ip_addr,
                                           if1_key, if2_key, n_tunnels,
                                           crypto_alg, integ_alg, raddr_ip1,
                                           raddr_ip2, raddr_range):
        """Create multiple IPsec tunnel interfaces between two VPP nodes.

        :param nodes: VPP nodes to create tunnel interfaces.
        :param if1_ip_addr: VPP node 1 interface IP4 address.
        :param if2_ip_addr: VPP node 2 interface IP4 address.
        :param if1_key: VPP node 1 interface key from topology file.
        :param if2_key: VPP node 2 interface key from topology file.
        :param n_tunnels: Number of tunnell interfaces to create.
        :param crypto_alg: The encryption algorithm name.
        :param integ_alg: The integrity algorithm name.
        :param raddr_ip1: Policy selector remote IPv4 start address for the
            first tunnel in direction node1->node2.
        :param raddr_ip2: Policy selector remote IPv4 start address for the
            first tunnel in direction node2->node1.
        :param raddr_range: Mask specifying range of Policy selector Remote IPv4
            addresses. Valid values are from 1 to 32.
        :type nodes: dict
        :type if1_ip_addr: str
        :type if2_ip_addr: str
        :type if1_key: str
        :type if2_key: str
        :type n_tunnels: int
        :type crypto_alg: CryptoAlg
        :type integ_alg: IntegAlg
        :type raddr_ip1: string
        :type raddr_ip2: string
        :type raddr_range: int
        """
        spi_1 = 100000
        spi_2 = 200000
        addr_incr = 1 << (32 - raddr_range)

        tmp_fn1 = '/tmp/ipsec_create_tunnel_dut1.config'
        tmp_fn2 = '/tmp/ipsec_create_tunnel_dut2.config'

        vat = VatExecutor()

        with open(tmp_fn1, 'w') as tmp_f1, open(tmp_fn2, 'w') as tmp_f2:
            tmp_f1.write(
                'exec create loopback interface\n'
                'exec set interface state loop0 up\n'
                'exec set interface ip address {uifc} {iaddr}/24\n'
                .format(
                    iaddr=ip_address(unicode(if2_ip_addr)) - 1,
                    uifc=Topology.get_interface_name(nodes['DUT1'], if1_key)))
            tmp_f2.write(
                'exec set interface ip address {uifc} {iaddr}/24\n'
                .format(
                    iaddr=ip_address(unicode(if2_ip_addr)),
                    uifc=Topology.get_interface_name(nodes['DUT2'], if2_key)))
            for i in range(0, n_tunnels):
                ckey = gen_key(IPsecUtil.get_crypto_alg_key_len(crypto_alg))
                ikey = gen_key(IPsecUtil.get_integ_alg_key_len(integ_alg))
                integ = ''
                if not crypto_alg.alg_name.startswith('aes-gcm-'):
                    integ = (
                        'integ_alg {integ_alg} '
                        'local_integ_key {local_integ_key} '
                        'remote_integ_key {remote_integ_key} '
                        .format(
                            integ_alg=integ_alg.alg_name,
                            local_integ_key=ikey,
                            remote_integ_key=ikey))
                tmp_f1.write(
                    'exec set interface ip address loop0 {laddr}/32\n'
                    'ipsec_tunnel_if_add_del '
                    'local_spi {local_spi} '
                    'remote_spi {remote_spi} '
                    'crypto_alg {crypto_alg} '
                    'local_crypto_key {local_crypto_key} '
                    'remote_crypto_key {remote_crypto_key} '
                    '{integ} '
                    'local_ip {laddr} '
                    'remote_ip {raddr}\n'
                    .format(
                        local_spi=spi_1 + i,
                        remote_spi=spi_2 + i,
                        crypto_alg=crypto_alg.alg_name,
                        local_crypto_key=ckey,
                        remote_crypto_key=ckey,
                        integ=integ,
                        laddr=ip_address(unicode(if1_ip_addr)) + i * addr_incr,
                        raddr=ip_address(unicode(if2_ip_addr))))
                tmp_f2.write(
                    'ipsec_tunnel_if_add_del '
                    'local_spi {local_spi} '
                    'remote_spi {remote_spi} '
                    'crypto_alg {crypto_alg} '
                    'local_crypto_key {local_crypto_key} '
                    'remote_crypto_key {remote_crypto_key} '
                    '{integ} '
                    'local_ip {laddr} '
                    'remote_ip {raddr}\n'
                    .format(
                        local_spi=spi_2 + i,
                        remote_spi=spi_1 + i,
                        crypto_alg=crypto_alg.alg_name,
                        local_crypto_key=ckey,
                        remote_crypto_key=ckey,
                        integ=integ,
                        laddr=ip_address(unicode(if2_ip_addr)),
                        raddr=ip_address(unicode(if1_ip_addr)) + i * addr_incr))
        vat.execute_script(tmp_fn1, nodes['DUT1'], timeout=1800, json_out=False,
                           copy_on_execute=True)
        vat.execute_script(tmp_fn2, nodes['DUT2'], timeout=1800, json_out=False,
                           copy_on_execute=True)
        os.remove(tmp_fn1)
        os.remove(tmp_fn2)

        with open(tmp_fn1, 'w') as tmp_f1, open(tmp_fn2, 'w') as tmp_f2:
            tmp_f2.write(
                'exec ip route add {raddr} via {uifc} {iaddr}\n'
                .format(
                    raddr=ip_network(unicode(if1_ip_addr+'/8'), False),
                    iaddr=ip_address(unicode(if2_ip_addr)) - 1,
                    uifc=Topology.get_interface_name(nodes['DUT2'], if2_key)))
            for i in range(0, n_tunnels):
                tmp_f1.write(
                    'exec set interface unnumbered ipsec{i} use {uifc}\n'
                    'exec set interface state ipsec{i} up\n'
                    'exec ip route add {taddr}/32 via ipsec{i}\n'
                    .format(
                        taddr=ip_address(unicode(raddr_ip2)) + i,
                        i=i,
                        uifc=Topology.get_interface_name(nodes['DUT1'],
                                                         if1_key)))
                tmp_f2.write(
                    'exec set interface unnumbered ipsec{i} use {uifc}\n'
                    'exec set interface state ipsec{i} up\n'
                    'exec ip route add {taddr}/32 via ipsec{i}\n'
                    .format(
                        taddr=ip_address(unicode(raddr_ip1)) + i,
                        i=i,
                        uifc=Topology.get_interface_name(nodes['DUT2'],
                                                         if2_key)))
        vat.execute_script(tmp_fn1, nodes['DUT1'], timeout=1800, json_out=False,
                           copy_on_execute=True)
        vat.execute_script(tmp_fn2, nodes['DUT2'], timeout=1800, json_out=False,
                           copy_on_execute=True)
        os.remove(tmp_fn1)
        os.remove(tmp_fn2)

    @staticmethod
    def vpp_ipsec_add_multiple_tunnels(nodes, interface1, interface2,
                                       n_tunnels, crypto_alg, integ_alg,
                                       tunnel_ip1, tunnel_ip2, raddr_ip1,
                                       raddr_ip2, raddr_range):
        """Create multiple IPsec tunnels between two VPP nodes.

        :param nodes: VPP nodes to create tunnels.
        :param interface1: Interface name or sw_if_index on node 1.
        :param interface2: Interface name or sw_if_index on node 2.
        :param n_tunnels: Number of tunnels to create.
        :param crypto_alg: The encryption algorithm name.
        :param integ_alg: The integrity algorithm name.
        :param tunnel_ip1: Tunnel node1 IPv4 address.
        :param tunnel_ip2: Tunnel node2 IPv4 address.
        :param raddr_ip1: Policy selector remote IPv4 start address for the
            first tunnel in direction node1->node2.
        :param raddr_ip2: Policy selector remote IPv4 start address for the
            first tunnel in direction node2->node1.
        :param raddr_range: Mask specifying range of Policy selector Remote IPv4
            addresses. Valid values are from 1 to 32.
        :type nodes: dict
        :type interface1: str or int
        :type interface2: str or int
        :type n_tunnels: int
        :type crypto_alg: CryptoAlg
        :type integ_alg: str
        :type tunnel_ip1: str
        :type tunnel_ip2: str
        :type raddr_ip1: string
        :type raddr_ip2: string
        :type raddr_range: int
        """
        spd_id = 1
        p_hi = 100
        p_lo = 10
        sa_id_1 = 100000
        sa_id_2 = 200000
        spi_1 = 300000
        spi_2 = 400000

        crypto_key = gen_key(IPsecUtil.get_crypto_alg_key_len(crypto_alg))
        integ_key = gen_key(IPsecUtil.get_integ_alg_key_len(integ_alg))

        IPsecUtil.vpp_ipsec_set_ip_route(
            nodes['DUT1'], n_tunnels, tunnel_ip1, raddr_ip2, tunnel_ip2,
            interface1, raddr_range)
        IPsecUtil.vpp_ipsec_set_ip_route(
            nodes['DUT2'], n_tunnels, tunnel_ip2, raddr_ip1, tunnel_ip1,
            interface2, raddr_range)

        IPsecUtil.vpp_ipsec_add_spd(
            nodes['DUT1'], spd_id)
        IPsecUtil.vpp_ipsec_spd_add_if(
            nodes['DUT1'], spd_id, interface1)
        IPsecUtil.vpp_ipsec_policy_add(
            nodes['DUT1'], spd_id, p_hi, PolicyAction.BYPASS, inbound=False,
            proto=50, laddr_range='100.0.0.0/8', raddr_range='100.0.0.0/8')
        IPsecUtil.vpp_ipsec_policy_add(
            nodes['DUT1'], spd_id, p_hi, PolicyAction.BYPASS, inbound=True,
            proto=50, laddr_range='100.0.0.0/8', raddr_range='100.0.0.0/8')

        IPsecUtil.vpp_ipsec_add_spd(
            nodes['DUT2'], spd_id)
        IPsecUtil.vpp_ipsec_spd_add_if(
            nodes['DUT2'], spd_id, interface2)
        IPsecUtil.vpp_ipsec_policy_add(
            nodes['DUT2'], spd_id, p_hi, PolicyAction.BYPASS, inbound=False,
            proto=50, laddr_range='100.0.0.0/8', raddr_range='100.0.0.0/8')
        IPsecUtil.vpp_ipsec_policy_add(
            nodes['DUT2'], spd_id, p_hi, PolicyAction.BYPASS, inbound=True,
            proto=50, laddr_range='100.0.0.0/8', raddr_range='100.0.0.0/8')

        IPsecUtil.vpp_ipsec_add_sad_entries(
            nodes['DUT1'], n_tunnels, sa_id_1, spi_1, crypto_alg, crypto_key,
            integ_alg, integ_key, tunnel_ip1, tunnel_ip2)

        IPsecUtil.vpp_ipsec_spd_add_entries(
            nodes['DUT1'], n_tunnels, spd_id, p_lo, False, sa_id_1, raddr_ip2)

        IPsecUtil.vpp_ipsec_add_sad_entries(
            nodes['DUT2'], n_tunnels, sa_id_1, spi_1, crypto_alg, crypto_key,
            integ_alg, integ_key, tunnel_ip1, tunnel_ip2)

        IPsecUtil.vpp_ipsec_spd_add_entries(
            nodes['DUT2'], n_tunnels, spd_id, p_lo, True, sa_id_1, raddr_ip2)

        IPsecUtil.vpp_ipsec_add_sad_entries(
            nodes['DUT2'], n_tunnels, sa_id_2, spi_2, crypto_alg, crypto_key,
            integ_alg, integ_key, tunnel_ip2, tunnel_ip1)

        IPsecUtil.vpp_ipsec_spd_add_entries(
            nodes['DUT2'], n_tunnels, spd_id, p_lo, False, sa_id_2, raddr_ip1)

        IPsecUtil.vpp_ipsec_add_sad_entries(
            nodes['DUT1'], n_tunnels, sa_id_2, spi_2, crypto_alg, crypto_key,
            integ_alg, integ_key, tunnel_ip2, tunnel_ip1)

        IPsecUtil.vpp_ipsec_spd_add_entries(
            nodes['DUT1'], n_tunnels, spd_id, p_lo, True, sa_id_2, raddr_ip1)

    @staticmethod
    def vpp_ipsec_show(node):
        """Run "show ipsec" debug CLI command.

        :param node: Node to run command on.
        :type node: dict
        """
        VatExecutor().execute_script('ipsec/ipsec_show.vat', node,
                                     json_out=False)