/usr/bin/ovs-vlan-test is in openvswitch-switch 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2010 Nicira Networks.
#
# 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 BaseHTTPServer
import getopt
import httplib
import os
import threading
import time
import signal #Causes keyboard interrupts to go to the main thread.
import socket
import sys
print_safe_lock = threading.Lock()
def print_safe(s):
print_safe_lock.acquire()
print(s)
print_safe_lock.release()
def start_thread(target, args):
t = threading.Thread(target=target, args=args)
t.setDaemon(True)
t.start()
return t
#Caller is responsible for catching socket.error exceptions.
def send_packet(key, length, dest_ip, dest_port):
length -= 20 + 8 #IP and UDP headers.
packet = str(key)
packet += chr(0) * (length - len(packet))
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(packet, (dest_ip, dest_port))
sock.close()
#UDP Receiver
class UDPReceiver:
def __init__(self, vlan_ip, vlan_port):
self.vlan_ip = vlan_ip
self.vlan_port = vlan_port
self.recv_callbacks = {}
self.udp_run = False
def recv_packet(self, key, success_callback, timeout_callback):
event = threading.Event()
def timeout_cb():
timeout_callback()
event.set()
timer = threading.Timer(30, timeout_cb)
timer.daemon = True
def success_cb():
timer.cancel()
success_callback()
event.set()
# Start the timer first to avoid a timer.cancel() race condition.
timer.start()
self.recv_callbacks[key] = success_cb
return event
def udp_receiver(self):
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(1)
try:
sock.bind((self.vlan_ip, self.vlan_port))
except socket.error, e:
print_safe('Failed to bind to %s:%d with error: %s'
% (self.vlan_ip, self.vlan_port, e))
os._exit(1) #sys.exit only exits the current thread.
while self.udp_run:
try:
data, _ = sock.recvfrom(4096)
except socket.timeout:
continue
except socket.error, e:
print_safe('Failed to receive from %s:%d with error: %s'
% (self.vlan_ip, self.vlan_port, e))
os._exit(1)
data_str = data.split(chr(0))[0]
if not data_str.isdigit():
continue
key = int(data_str)
if key in self.recv_callbacks:
self.recv_callbacks[key]()
del self.recv_callbacks[key]
def start(self):
self.udp_run = True
start_thread(self.udp_receiver, ())
def stop(self):
self.udp_run = False
#Server
vlan_server = None
class VlanServer:
def __init__(self, server_ip, server_port, vlan_ip, vlan_port):
global vlan_server
vlan_server = self
self.server_ip = server_ip
self.server_port = server_port
self.recv_response = '%s:%d:' % (vlan_ip, vlan_port)
self.result = {}
self.result_lock = threading.Lock()
self._test_id = 0
self._test_id_lock = threading.Lock()
self.udp_recv = UDPReceiver(vlan_ip, vlan_port)
def get_test_id(self):
self._test_id_lock.acquire()
self._test_id += 1
ret = self._test_id
self._test_id_lock.release()
return ret
def set_result(self, key, value):
self.result_lock.acquire()
if key not in self.result:
self.result[key] = value
self.result_lock.release()
def recv(self, test_id):
self.udp_recv.recv_packet(test_id,
lambda : self.set_result(test_id, 'Success'),
lambda : self.set_result(test_id, 'Timeout'))
return self.recv_response + str(test_id)
def send(self, test_id, data):
try:
ip, port, size = data.split(':')
port = int(port)
size = int(size)
except ValueError:
self.set_result(test_id,
'Server failed to parse send request: %s' % data)
return
def send_thread():
send_time = 10
for _ in range(send_time * 2):
try:
send_packet(test_id, size, ip, port)
except socket.error, e:
self.set_result(test_id, 'Failure: ' + str(e))
return
time.sleep(.5)
self.set_result(test_id, 'Success')
start_thread(send_thread, ())
return str(test_id)
def run(self):
self.udp_recv.start()
try:
BaseHTTPServer.HTTPServer((self.server_ip, self.server_port),
VlanServerHandler).serve_forever()
except socket.error, e:
print_safe('Failed to start control server: %s' % e)
self.udp_recv.stop()
return 1
class VlanServerHandler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_GET(self):
#Guarantee three arguments.
path = (self.path.lower().lstrip('/') + '//').split('/')
resp = 404
body = None
if path[0] == 'start':
test_id = vlan_server.get_test_id()
if path[1] == 'recv':
resp = 200
body = vlan_server.recv(test_id)
elif path[1] == 'send':
resp = 200
body = vlan_server.send(test_id, path[2])
elif (path[0] == 'result'
and path[1].isdigit()
and int(path[1]) in vlan_server.result):
resp = 200
body = vlan_server.result[int(path[1])]
elif path[0] == 'ping':
resp = 200
body = 'pong'
self.send_response(resp)
self.end_headers()
if body:
self.wfile.write(body)
#Client
class VlanClient:
def __init__(self, server_ip, server_port, vlan_ip, vlan_port):
self.server_ip_port = '%s:%d' % (server_ip, server_port)
self.vlan_ip_port = "%s:%d" % (vlan_ip, vlan_port)
self.udp_recv = UDPReceiver(vlan_ip, vlan_port)
def request(self, resource):
conn = httplib.HTTPConnection(self.server_ip_port)
conn.request('GET', resource)
return conn
def send(self, size):
def error_msg(e):
print_safe('Send size %d unsuccessful: %s' % (size, e))
try:
conn = self.request('/start/recv')
data = conn.getresponse().read()
except (socket.error, httplib.HTTPException), e:
error_msg(e)
return False
try:
ip, port, test_id = data.split(':')
port = int(port)
test_id = int(test_id)
except ValueError:
error_msg("Received invalid response from control server (%s)" %
data)
return False
send_time = 5
for _ in range(send_time * 4):
try:
send_packet(test_id, size, ip, port)
resp = self.request('/result/%d' % test_id).getresponse()
data = resp.read()
except (socket.error, httplib.HTTPException), e:
error_msg(e)
return False
if resp.status == 200 and data == 'Success':
print_safe('Send size %d successful' % size)
return True
elif resp.status == 200:
error_msg(data)
return False
time.sleep(.25)
error_msg('Timeout')
return False
def recv(self, size):
def error_msg(e):
print_safe('Receive size %d unsuccessful: %s' % (size, e))
resource = '/start/send/%s:%d' % (self.vlan_ip_port, size)
try:
conn = self.request(resource)
test_id = conn.getresponse().read()
except (socket.error, httplib.HTTPException), e:
error_msg(e)
return False
if not test_id.isdigit():
error_msg('Invalid response %s' % test_id)
return False
success = [False] #Primitive datatypes can't be set from closures.
def success_cb():
success[0] = True
def failure_cb():
success[0] = False
self.udp_recv.recv_packet(int(test_id), success_cb, failure_cb).wait()
if success[0]:
print_safe('Receive size %d successful' % size)
else:
error_msg('Timeout')
return success[0]
def server_up(self):
def error_msg(e):
print_safe('Failed control server connectivity test: %s' % e)
try:
resp = self.request('/ping').getresponse()
data = resp.read()
except (socket.error, httplib.HTTPException), e:
error_msg(e)
return False
if resp.status != 200:
error_msg('Invalid status %d' % resp.status)
elif data != 'pong':
error_msg('Invalid response %s' % data)
return True
def run(self):
if not self.server_up():
return 1
self.udp_recv.start()
success = True
for size in [50, 500, 1000, 1500]:
success = self.send(size) and success
success = self.recv(size) and success
self.udp_recv.stop()
if success:
print_safe('OK')
return 0
else:
print_safe('FAILED')
return 1
def usage():
print_safe("""\
%(argv0)s: Test vlan connectivity
usage: %(argv0)s server vlan
The following options are also available:
-s, --server run in server mode
-h, --help display this help message
-V, --version display version information\
""" % {'argv0': sys.argv[0]})
def main():
try:
options, args = getopt.gnu_getopt(sys.argv[1:], 'hVs',
['help', 'version', 'server'])
except getopt.GetoptError, geo:
print_safe('%s: %s\n' % (sys.argv[0], geo.msg))
return 1
server = False
for key, _ in options:
if key in ['-h', '--help']:
usage()
return 0
elif key in ['-V', '--version']:
print_safe('ovs-vlan-test (Open vSwitch) 1.4.0')
return 0
elif key in ['-s', '--server']:
server = True
else:
print_safe('Unexpected option %s. (use --help for help)' % key)
return 1
if len(args) != 2:
print_safe('Expecting two arguments. (use --help for help)')
return 1
try:
server_ip, server_port = args[0].split(':')
server_port = int(server_port)
except ValueError:
server_ip = args[0]
server_port = 80
try:
vlan_ip, vlan_port = args[1].split(':')
vlan_port = int(vlan_port)
except ValueError:
vlan_ip = args[1]
vlan_port = 15213
if server:
return VlanServer(server_ip, server_port, vlan_ip, vlan_port).run()
else:
return VlanClient(server_ip, server_port, vlan_ip, vlan_port).run()
if __name__ == '__main__':
main_ret = main()
# Python can throw exceptions if threads are running at exit.
for th in threading.enumerate():
if th != threading.currentThread():
th.join()
sys.exit(main_ret)
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