c2eb890259
Since dpkt is not provided in RDO packages we need to replace it with other library. In this patch dpkt library is replaced by scapy. Change-Id: Ifd3348bf183e35f40a8f13e97c1936faf20ce705
138 lines
5.0 KiB
Python
138 lines
5.0 KiB
Python
# Copyright 2019 Red Hat, Inc.
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# All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import time
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import fixtures
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from oslo_log import log
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from scapy.all import ICMP
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from scapy.all import rdpcap
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from tempest import config
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from tempest.lib import exceptions
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from whitebox_neutron_tempest_plugin.common import utils
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CONF = config.CONF
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LOG = log.getLogger(__name__)
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class TcpdumpCapture(fixtures.Fixture):
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capture_files = None
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processes = None
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def __init__(self, client, interfaces, filter_str=''):
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self.client = client
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self.interfaces = [ifc.strip() for ifc in interfaces.split(',')]
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self.filter_str = filter_str
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self.timeout = CONF.whitebox_options.capture_timeout
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def _setUp(self):
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self.start()
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def start(self):
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if not self.capture_files:
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# mktemp needs to be executed with sudo - otherwise the later
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# tcpdump command (run with sudo) fails because the created temp
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# file cannot be written
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# This happens in RHEL9 because fs.protected_regular is enabled
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self.capture_files = []
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self.processes = []
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for interface in self.interfaces:
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process = self.client.open_session()
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capture_file = self.client.exec_command('sudo mktemp').rstrip()
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cmd = 'sudo timeout {} tcpdump -s0 -Uni {} {} -w {}'.format(
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self.timeout, interface, self.filter_str,
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capture_file)
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self.capture_files.append(capture_file)
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LOG.debug('Executing command: {}'.format(cmd))
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process.exec_command(cmd)
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self.processes.append(process)
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self.addCleanup(self.cleanup)
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def stop(self):
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for process in (self.processes or []):
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process.close()
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self.processes = None
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def cleanup(self):
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self.stop()
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if self.capture_files:
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if utils.host_responds_to_ping(self.client.host):
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self.client.exec_command(
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'sudo rm -f ' + ' '.join(self.capture_files))
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self.capture_files = None
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def is_empty(self):
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try:
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pcap = rdpcap(self._open_capture_file())
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except Exception as e:
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LOG.debug('Error reading pcap file: ', str(e))
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return True
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for record in pcap:
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return False
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return True
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def get_next_hop_mtu(self):
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pcap = rdpcap(self._open_capture_file())
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for record in pcap:
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if 'IP' in record and 'ICMP' in record:
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icmp = record[ICMP]
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# ICMP type 3 = Destionation Unreachable
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if icmp.type == 3:
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return repr(icmp.nexthopmtu)
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return None
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def _open_capture_file(self):
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if not self.capture_files:
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raise ValueError('No capture files available')
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elif len(self.capture_files) == 1:
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merged_cap_file = self.capture_files[0]
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else:
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cap_file_candidates = []
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print_pcap_file_cmd = 'sudo tcpdump -r {} | wc -l'
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for cap_file in self.capture_files:
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if 0 < int(self.client.exec_command(
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print_pcap_file_cmd.format(cap_file)).rstrip()):
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# cap files that are not empty
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cap_file_candidates.append(cap_file)
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if not cap_file_candidates:
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# they are all empty
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merged_cap_file = self.capture_files[0]
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elif 1 == len(cap_file_candidates):
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merged_cap_file = cap_file_candidates[0]
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else:
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merged_cap_file = self.client.exec_command(
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'sudo mktemp').rstrip()
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n_retries = 5
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for i in range(n_retries):
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try:
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self.client.exec_command(
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'sudo tcpslice -w {} {}'.format(
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merged_cap_file,
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' '.join(cap_file_candidates)))
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except exceptions.SSHExecCommandFailed as exc:
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if i == (n_retries - 1):
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raise exc
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LOG.warn('tcpslice command failed - retrying...')
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time.sleep(5)
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else:
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break
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ssh_channel = self.client.open_session()
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ssh_channel.exec_command('sudo cat ' + merged_cap_file)
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self.addCleanup(ssh_channel.close)
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return ssh_channel.makefile()
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