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#! /usr/bin/python
#
# Copyright (c) 2009, 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 getopt
import os
import re
import subprocess
import sys
argv0 = sys.argv[0]
BRCTL = "/usr/lib/openvswitch/xs-original/brctl"
VSCTL = "/usr/bin/ovs-vsctl"
OVSDB_SERVER = "unix:/var/run/openvswitch/db.sock"
# Execute the real brctl program, passing the same arguments that were passed
# to us.
def delegate():
os.execl(BRCTL, BRCTL, *sys.argv[1:])
# execl should never return. We only arrive here if brctl failed to exec.
sys.exit(1)
def call_vsctl(cmd, arg=""):
database = '--db=' + OVSDB_SERVER
command = [VSCTL, database, cmd]
if (arg):
command.append(arg)
return subprocess.Popen(command, stdout=subprocess.PIPE).communicate()[0].split()
# Returns a list of all the bridges
def get_bridges():
return call_vsctl('list-br')
# Returns a list of all ports on 'bridge'
def get_bridge_ports(bridge):
return call_vsctl('list-ports', bridge)
# Returns a list of all interfaces on 'bridge'
def get_bridge_ifaces(bridge):
return call_vsctl('list-ifaces', bridge)
# Returns the parent of 'bridge'. If 'bridge' does not have a parent,
# 'bridge' is returned.
def get_bridge_parent(bridge):
return call_vsctl('br-to-parent', bridge)
# Returns the first line of the file named 'name', with the trailing new-line
# (if any) stripped off.
def read_first_line_of_file(name):
file = None
try:
file = open(name, 'r')
return file.readline().rstrip('\n')
finally:
if file != None:
file.close()
# Returns a bridge ID constructed from the MAC address of network device
# 'netdev', in the format "8000.000102030405".
def get_bridge_id(netdev):
try:
hwaddr = read_first_line_of_file("/sys/class/net/%s/address" % netdev)
return "8000.%s" % (hwaddr.replace(":", ""))
except:
return "8000.002320ffffff"
def cmd_show():
print "bridge name\tbridge id\t\tSTP enabled\tinterfaces"
# Find all the bridges.
bridges = get_bridges()
# Find all the interfaces on each bridge.
for bridge in bridges:
bridge_ports = get_bridge_ports(bridge)
parent = get_bridge_parent(bridge)
if parent in bridge_ports:
bridge_ports.remove(parent)
bridge_ports.sort()
bridge_id = get_bridge_id(bridge)
first_port = ""
if bridge_ports:
first_port = bridge_ports[0]
print "%s\t\t%s\t%s\t\t%s" % (bridge, bridge_id, "no", first_port)
for port in bridge_ports[1:]:
print "\t\t\t\t\t\t\t%s" % port
def main():
# Check the network configuration mode.
try:
network_mode = read_first_line_of_file('/etc/xensource/network.conf')
if network_mode == 'bridge':
delegate()
except:
# File probably doesn't exist
pass
# Parse the command line.
try:
options, args = getopt.gnu_getopt(sys.argv[1:],
"hV", ["help", "version"])
except getopt.GetoptError, msg:
sys.stderr.write("%s: %s (use --help for help)\n" % (argv0, msg))
sys.exit(1)
# Handle command-line options.
for opt, optarg in options:
if opt == "-h" or opt == "--help":
delegate()
elif opt == "-V" or opt == "--version":
subprocess.call([BRCTL, "--version"])
print "Open vSwitch brctl wrapper"
sys.exit(0)
# Execute commands. Most commands are delegated to the brctl binary that
# we are wrapping, but we implement the "show" command ourselves.
if args and args[0] == "show":
cmd_show()
else:
delegate()
if __name__ == "__main__":
main()
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