#!/usr/bin/python

#
# Copyright (c) 2020 by VMware, Inc. ("VMware")
# Used Copyright (c) 2018 by Network Device Education Foundation, Inc.
# ("NetDEF") in this file.
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND VMWARE DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL VMWARE BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#


"""OSPF Basic Functionality Automation."""
import os
import sys
import time
import pytest
from time import sleep
from copy import deepcopy
from lib.topotest import frr_unicode

# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
sys.path.append(os.path.join(CWD, "../lib/"))

# pylint: disable=C0413
# Import topogen and topotest helpers
from lib.topogen import Topogen, get_topogen

# Import topoJson from lib, to create topology and initial configuration
from lib.common_config import (
    start_topology,
    write_test_header,
    write_test_footer,
    reset_config_on_routers,
    step,
    shutdown_bringup_interface,
    topo_daemons,
)
from lib.topolog import logger
from lib.topojson import build_config_from_json
from lib.ospf import verify_ospf_neighbor, config_ospf_interface, clear_ospf
from ipaddress import IPv4Address

pytestmark = [pytest.mark.ospfd]


# Global variables
topo = None
"""
TOPOOLOGY =
      Please view in a fixed-width font such as Courier.
      +---+  A1       +---+
      +R1 +------------+R2 |
      +-+-+-           +--++
        |  --        --  |
        |    -- A0 --    |
      A0|      ----      |
        |      ----      | A2
        |    --    --    |
        |  --        --  |
      +-+-+-            +-+-+
      +R0 +-------------+R3 |
      +---+     A3     +---+

TESTCASES =
1. Verify ospf authentication with Simple password authentication.
2. Verify ospf authentication with MD5 authentication.
3. Verify ospf authentication with different authentication methods.

 """


def setup_module(mod):
    """
    Sets up the pytest environment

    * `mod`: module name
    """
    testsuite_run_time = time.asctime(time.localtime(time.time()))
    logger.info("Testsuite start time: {}".format(testsuite_run_time))
    logger.info("=" * 40)

    logger.info("Running setup_module to create topology")

    # This function initiates the topology build with Topogen...
    json_file = "{}/ospf_authentication.json".format(CWD)
    tgen = Topogen(json_file, mod.__name__)
    global topo
    topo = tgen.json_topo
    # ... and here it calls Mininet initialization functions.

    # get list of daemons needs to be started for this suite.
    daemons = topo_daemons(tgen, topo)

    # Starting topology, create tmp files which are loaded to routers
    #  to start daemons and then start routers
    start_topology(tgen, daemons)

    # Creating configuration from JSON
    build_config_from_json(tgen, topo)

    # Don't run this test if we have any failure.
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)

    ospf_covergence = verify_ospf_neighbor(tgen, topo)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    logger.info("Running setup_module() done")


def teardown_module(mod):
    """
    Teardown the pytest environment.

    * `mod`: module name
    """

    logger.info("Running teardown_module to delete topology")

    tgen = get_topogen()

    # Stop toplogy and Remove tmp files
    tgen.stop_topology()

    logger.info(
        "Testsuite end time: {}".format(time.asctime(time.localtime(time.time())))
    )
    logger.info("=" * 40)


# ##################################
# Test cases start here.
# ##################################


def test_ospf_authentication_simple_pass_tc28_p1(request):
    """
    OSPF Authentication - Verify ospf authentication with Simple
    password authentication.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)
    step(
        "Configure ospf with on R1 and R2, enable ospf on R1 interface"
        "connected to R2 with simple password authentication  using  ip ospf "
        "authentication  Simple password cmd."
    )

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step("clear ip ospf after configuring the authentication.")
    clear_ospf(tgen, "r1")

    step("Verify that the neighbour is not FULL between R1 and R2.")
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut, expected=False)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(
        "On R2 enable ospf on interface with simple password authentication "
        "using ip ospf authentication  Simple password cmd."
    )

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2  "
        "using show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(
        "Disable simple password authentication on R2  using no ip ospf "
        "authentication Simple password cmd."
    )
    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "ospf",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step("Verify on R1 neighbour is deleted for R2 after dead interval expiry")
    # wait till the dead time expiry
    sleep(6)
    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(
        tgen, topo, dut=dut, expected=False, retry_timeout=10
    )
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Again On R2 enable ospf on interface with  Simple password auth")
    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2 using"
        " show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Shut no shut interface on R1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)

    dut = "r2"
    step(
        "Verify that the neighbour is not FULL between R1 and R2 using "
        "show ip ospf neighbor cmd."
    )
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut, expected=False)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    dut = "r1"
    shutdown_bringup_interface(tgen, dut, intf, True)

    step(
        "Verify that the neighbour is FULL between R1 and R2 using "
        "show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Change Ip address on R1 and R2")

    topo_modify_change_ip = deepcopy(topo)
    intf_ip = topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"]
    topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"] = str(
        IPv4Address(frr_unicode(intf_ip.split("/")[0])) + 3
    ) + "/{}".format(intf_ip.split("/")[1])

    build_config_from_json(tgen, topo_modify_change_ip, save_bkup=False)

    reset_config_on_routers(tgen, routerName="r1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)
    shutdown_bringup_interface(tgen, dut, intf, True)

    # clear ip ospf after configuring the authentication.
    clear_ospf(tgen, "r1")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2 with new "
        "ip address using show ip ospf "
    )

    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    write_test_footer(tc_name)


def test_ospf_authentication_md5_tc29_p1(request):
    """
    OSPF Authentication - Verify ospf authentication with MD5 authentication.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)
    step(
        "Configure ospf with on R1 and R2, enable ospf on R1 interface "
        "connected to R2 with message-digest authentication using  ip "
        "ospf authentication  message-digest cmd."
    )

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step("Verify that the neighbour is not FULL between R1 and R2.")
    # wait for dead time expiry.
    sleep(6)
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(
        tgen, topo, dut=dut, expected=False, retry_timeout=6
    )
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(
        "On R2 enable ospf on interface with message-digest authentication"
        "  using  ip ospf authentication  message-digest password cmd."
    )

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2  "
        "using show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(
        "Disable message-digest authentication on R2  using no ip ospf "
        "authentication  message-digest password cmd."
    )

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step("Verify on R1 ,nbr is deleted for R2 after dead interval expiry")
    #  wait till the dead timer expiry
    sleep(6)
    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(
        tgen, topo, dut=dut, expected=False, retry_timeout=10
    )
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Again On R2 enable ospf on interface with  message-digest auth")
    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2 using"
        " show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Shut no shut interface on R1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)

    dut = "r2"
    step(
        "Verify that the neighbour is not FULL between R1 and R2 using "
        "show ip ospf neighbor cmd."
    )
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut, expected=False)
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    dut = "r1"
    shutdown_bringup_interface(tgen, dut, intf, True)

    step(
        "Verify that the neighbour is FULL between R1 and R2 using "
        "show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Change Ip address on R1 and R2")

    topo_modify_change_ip = deepcopy(topo)

    intf_ip = topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"]

    topo_modify_change_ip["routers"]["r1"]["links"]["r2"]["ipv4"] = str(
        IPv4Address(frr_unicode(intf_ip.split("/")[0])) + 3
    ) + "/{}".format(intf_ip.split("/")[1])

    build_config_from_json(tgen, topo_modify_change_ip, save_bkup=False)

    reset_config_on_routers(tgen, routerName="r1")
    dut = "r1"
    intf = topo["routers"]["r1"]["links"]["r2"]["interface"]
    shutdown_bringup_interface(tgen, dut, intf, False)
    shutdown_bringup_interface(tgen, dut, intf, True)
    clear_ospf(tgen, "r1")
    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2 with new "
        "ip address using show ip ospf "
    )

    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    write_test_footer(tc_name)


def test_ospf_authentication_different_auths_tc30_p1(request):
    """
    OSPF Authentication - Verify ospf authentication with different
    authentication methods.

    """
    tc_name = request.node.name
    write_test_header(tc_name)
    tgen = get_topogen()
    global topo
    step("Bring up the base config.")
    reset_config_on_routers(tgen)
    step(
        "Configure ospf with on R1 and R2, enable ospf on R1 interface "
        "connected to R2 with message-digest authentication using  ip "
        "ospf authentication  message-digest cmd."
    )

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    # wait for dead timer expiry
    sleep(6)
    step("Verify that the neighbour is not FULL between R1 and R2.")
    dut = "r1"
    ospf_covergence = verify_ospf_neighbor(
        tgen, topo, dut=dut, expected=False, retry_timeout=10
    )
    assert ospf_covergence is not True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(
        "On R2 enable ospf on interface with message-digest authentication"
        "  using  ip ospf authentication  message-digest password cmd."
    )

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2  "
        "using show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step(" Delete the configured password on both the routers.")

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the deletion is successful and  neighbour is FULL"
        " between R1 and R2 using show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Change the authentication type to simple password.")
    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {"ospf": {"authentication": True, "authentication-key": "ospf"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the deletion is successful and  neighbour is"
        " FULL between R1 and R2 using show ip "
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Change the password in simple password.")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {"ospf": {"authentication": True, "authentication-key": "OSPFv4"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {"ospf": {"authentication": True, "authentication-key": "OSPFv4"}}
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the deletion is successful and  neighbour is"
        " FULL between R1 and R2 using show ip "
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Delete the password authentication on the interface ")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": True,
                        "authentication-key": "OSPFv4",
                        "del_action": True,
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the deletion is successful and  neighbour is"
        " FULL between R1 and R2 using show ip "
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Enable Md5 authentication on the interface")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "ospf",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    step(
        "Verify that the neighbour is FULL between R1 and R2 using"
        " show ip ospf neighbor cmd."
    )

    dut = "r2"
    ospf_covergence = verify_ospf_neighbor(tgen, topo, dut=dut)
    assert ospf_covergence is True, "setup_module :Failed \n Error:" " {}".format(
        ospf_covergence
    )

    step("Change the MD5 authentication password")

    r1_ospf_auth = {
        "r1": {
            "links": {
                "r2": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "OSPFv4",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r1_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    r2_ospf_auth = {
        "r2": {
            "links": {
                "r1": {
                    "ospf": {
                        "authentication": "message-digest",
                        "authentication-key": "OSPFv4",
                        "message-digest-key": "10",
                    }
                }
            }
        }
    }
    result = config_ospf_interface(tgen, topo, r2_ospf_auth)
    assert result is True, "Testcase {} :Failed \n Error: {}".format(tc_name, result)

    write_test_footer(tc_name)


if __name__ == "__main__":
    args = ["-s"] + sys.argv[1:]
    sys.exit(pytest.main(args))