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# Copyright (c) 2016 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 resources.libraries.python.VatExecutor import VatExecutor
class NATUtil(object):
"""NAT utilities."""
def __init__(self):
pass
@staticmethod
def vpp_get_nat_static_mappings(node):
"""Get NAT static mappings from VPP node.
:param node: VPP node.
:type node: dict
:returns: List of static mappings.
:rtype: list
:raises RuntimeError: If the output is not as expected.
"""
vat = VatExecutor()
# JSON output not supported for this command
vat.execute_script('snat/snat_mapping_dump.vat', node, json_out=False)
stdout = vat.get_script_stdout()
lines = stdout.split("\n")
data = []
# lines[0,1] are table and column headers
for line in lines[2::]:
# Ignore extra data after NAT table
if "snat_static_mapping_dump error: Misc" in line or "vat#" in line:
continue
items = line.split(" ")
while "" in items:
items.remove("")
if len(items) == 0:
continue
elif len(items) == 4:
# no ports were returned
data.append({
"local_address": items[0],
"remote_address": items[1],
"vrf": items[2],
"protocol": items[3]
})
elif len(items) == 6:
data.append({
"local_address": items[0],
"local_port": items[1],
"remote_address": items[2],
"remote_port": items[3],
"vrf": items[4],
"protocol": items[5]
})
else:
raise RuntimeError("Unexpected output from snat_mapping_dump.")
return data
@staticmethod
def vpp_get_nat_interfaces(node):
"""Get list of interfaces configured with NAT from VPP node.
:param node: VPP node.
:type node: dict
:returns: List of interfaces on the node that are configured with NAT.
:rtype: list
:raises RuntimeError: If the output is not as expected.
"""
vat = VatExecutor()
# JSON output not supported for this command
vat.execute_script('snat/snat_interface_dump.vat', node,
json_out=False)
stdout = vat.get_script_stdout()
lines = stdout.split("\n")
data = []
for line in lines:
items = line.split(" ")
for trash in ("", "vat#"):
while trash in items:
items.remove(trash)
if len(items) == 0:
continue
elif len(items) == 3:
data.append({
# items[0] is the table header - "sw_if_index"
"sw_if_index": items[1],
"direction": items[2]
})
else:
raise RuntimeError(
"Unexpected output from snat_interface_dump.")
return data
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