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# 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.
"""NAT utilities library."""
from pprint import pformat
from socket import AF_INET, inet_pton
from enum import IntEnum
from robot.api import logger
from resources.libraries.python.InterfaceUtil import InterfaceUtil
from resources.libraries.python.PapiExecutor import PapiSocketExecutor
class NATConfigFlags(IntEnum):
"""Common NAT plugin APIs"""
NAT_IS_NONE = 0x00
NAT_IS_TWICE_NAT = 0x01
NAT_IS_SELF_TWICE_NAT = 0x02
NAT_IS_OUT2IN_ONLY = 0x04
NAT_IS_ADDR_ONLY = 0x08
NAT_IS_OUTSIDE = 0x10
NAT_IS_INSIDE = 0x20
NAT_IS_STATIC = 0x40
NAT_IS_EXT_HOST_VALID = 0x80
class NATUtil:
"""This class defines the methods to set NAT."""
def __init__(self):
pass
@staticmethod
def set_nat44_interfaces(node, int_in, int_out):
"""Set inside and outside interfaces for NAT44.
:param node: DUT node.
:param int_in: Inside interface.
:param int_out: Outside interface.
:type node: dict
:type int_in: str
:type int_out: str
"""
cmd = u"nat44_interface_add_del_feature"
int_in_idx = InterfaceUtil.get_sw_if_index(node, int_in)
err_msg = f"Failed to set inside interface {int_in} for NAT44 " \
f"on host {node[u'host']}"
args_in = dict(
sw_if_index=int_in_idx,
is_add=1,
flags=getattr(NATConfigFlags, u"NAT_IS_INSIDE").value
)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args_in).get_reply(err_msg)
int_out_idx = InterfaceUtil.get_sw_if_index(node, int_out)
err_msg = f"Failed to set outside interface {int_out} for NAT44 " \
f"on host {node[u'host']}"
args_in = dict(
sw_if_index=int_out_idx,
is_add=1,
flags=getattr(NATConfigFlags, u"NAT_IS_OUTSIDE").value
)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args_in).get_reply(err_msg)
@staticmethod
def set_nat44_deterministic(node, ip_in, subnet_in, ip_out, subnet_out):
"""Set deterministic behaviour of NAT44.
:param node: DUT node.
:param ip_in: Inside IP.
:param subnet_in: Inside IP subnet.
:param ip_out: Outside IP.
:param subnet_out: Outside IP subnet.
:type node: dict
:type ip_in: str
:type subnet_in: str or int
:type ip_out: str
:type subnet_out: str or int
"""
cmd = u"nat_det_add_del_map"
err_msg = f"Failed to set deterministic behaviour of NAT " \
f"on host {node[u'host']}"
args_in = dict(
is_add=True,
in_addr=inet_pton(AF_INET, str(ip_in)),
in_plen=int(subnet_in),
out_addr=inet_pton(AF_INET, str(ip_out)),
out_plen=int(subnet_out)
)
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args_in).get_reply(err_msg)
@staticmethod
def show_nat(node):
"""Show the NAT configuration and data.
Used data sources:
nat_show_config
nat_worker_dump
nat44_interface_addr_dump
nat44_address_dump
nat44_static_mapping_dump
nat44_user_dump
nat44_interface_dump
nat44_user_session_dump
nat_det_map_dump
:param node: DUT node.
:type node: dict
"""
cmd = u"nat_show_config"
err_msg = f"Failed to get NAT configuration on host {node[u'host']}"
with PapiSocketExecutor(node) as papi_exec:
reply = papi_exec.add(cmd).get_reply(err_msg)
logger.debug(f"NAT Configuration:\n{pformat(reply)}")
cmds = [
u"nat_worker_dump",
u"nat44_interface_addr_dump",
u"nat44_address_dump",
u"nat44_static_mapping_dump",
u"nat44_user_dump",
u"nat44_interface_dump",
u"nat44_user_session_dump",
u"nat_det_map_dump"
]
PapiSocketExecutor.dump_and_log(node, cmds)
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