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# Copyright 2016 Google Inc.
#
# 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.
import shutil
from mobly.controllers import sniffer
from mobly.controllers.sniffer_lib.local import local_base
class Sniffer(local_base.SnifferLocalBase):
"""This class defines a sniffer which uses tcpdump as its back-end"""
def __init__(self, config_path, logger, base_configs=None):
"""See base class documentation"""
self._executable_path = None
super().__init__(config_path, logger, base_configs=base_configs)
self._executable_path = shutil.which("tcpdump")
if self._executable_path is None:
raise sniffer.SnifferError(
"Cannot find a path to the 'tcpdump' executable"
)
def get_descriptor(self):
"""See base class documentation"""
return "local-tcpdump-{}".format(self._interface)
def get_subtype(self):
"""See base class documentation"""
return "tcpdump"
def _get_command_line(
self, additional_args=None, duration=None, packet_count=None
):
cmd = "{} -i {} -w {}".format(
self._executable_path, self._interface, self._temp_capture_file_path
)
if packet_count is not None:
cmd = "{} -c {}".format(cmd, packet_count)
if additional_args is not None:
cmd = "{} {}".format(cmd, additional_args)
return cmd
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