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networkConfig.py

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# Licensed to the Apache Software Foundation (ASF) under one

# or more contributor license agreements. See the NOTICE file

# distributed with this work for additional information

# regarding copyright ownership. The ASF licenses this file

# to you 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.

from utilities import bash

from cloudException import CloudRuntimeException, CloudInternalException

import logging

import os

import re

import subprocess

class networkConfig:

class devInfo:

def __init__(self, macAddr, ipAddr, netmask, gateway, type, name):

self.name = name

self.macAdrr = macAddr

self.ipAddr = ipAddr

self.netmask = netmask

self.gateway = gateway

self.type = type

self.name = name

#dhcp or static

self.method = None

@staticmethod

def getDefaultNetwork():

cmd = bash("route -n|awk \'/^0.0.0.0/ {print $2,$8}\'")

if not cmd.isSuccess():

logging.debug("Failed to get default route")

raise CloudRuntimeException("Failed to get default route")

result = cmd.getStdout().split(" ")

gateway = result[0]

dev = result[1]

pdi = networkConfig.getDevInfo(dev)

logging.debug("Found default network device:%s"%pdi.name)

pdi.gateway = gateway

return pdi

@staticmethod

def createBridge(dev, brName):

if not networkConfig.isBridgeSupported():

logging.debug("bridge is not supported")

return False

if networkConfig.isBridgeEnslavedWithDevices(brName):

logging.debug("bridge: %s has devices enslaved"%brName)

return False

cmds = ""

if not networkConfig.isBridge(brName):

cmds = "brctl addbr %s ;"%brName

cmds += "ifconfig %s up;"%brName

cmds += "brctl addif %s %s"%(brName, dev)

return bash(cmds).isSuccess()

@staticmethod

def isBridgeEnslavedWithDevices(brName):

if not networkConfig.isBridge(brName):

return False

if not os.listdir("/sys/class/net/%s/brif"%brName):

return False

return True

@staticmethod

def isBridgeSupported():

if os.path.exists("/proc/sys/net/bridge"):

return True

return bash("modprobe -b bridge").isSucess()

@staticmethod

def isNetworkDev(devName):

return os.path.exists("/sys/class/net/%s" % devName)

@staticmethod

def isBridgePort(devName):

return os.path.exists("/sys/class/net/%s/brport" % devName)

@staticmethod

def isBridge(devName):

return os.path.exists("/sys/class/net/%s/bridge" % devName)

@staticmethod

def isOvsBridge(devName):

try:

return 0==subprocess.check_call(("ovs-vsctl", "br-exists", devName))

except subprocess.CalledProcessError:

return False

@staticmethod

def getBridge(devName):

bridgeName = None

if os.path.exists("/sys/class/net/%s/brport/bridge"%devName):

realPath = os.path.realpath("/sys/class/net/%s/brport/bridge"%devName)

bridgeName = realPath.split("/")[-1]

return bridgeName

@staticmethod

def getEnslavedDev(br, brPort):

if not networkConfig.isBridgeEnslavedWithDevices(br):

return None

for dev in os.listdir("/sys/class/net/%s/brif"%br):

br_port = int(file("/sys/class/net/%s/brif/%s/port_no"%(br,dev)).readline().strip("\n"), 16)

if br_port == brPort:

return dev

return None

@staticmethod

def getDevInfo(dev):

if not networkConfig.isNetworkDev(dev):

logging.debug("dev: " + dev + " is not a network device")

raise CloudInternalException("dev: " + dev + " is not a network device")

netmask = None

ipAddr = None

macAddr = None

cmd = bash("ifconfig " + dev)

if not cmd.isSuccess():

logging.debug("Failed to get address from ifconfig")

raise CloudInternalException("Failed to get network info by ifconfig %s"%dev)

for line in cmd.getLines():

if line.find("HWaddr") != -1:

macAddr = line.split("HWaddr ")[1].strip(" ")

elif line.find("inet ") != -1:

m = re.search("addr:(.*)\ *Bcast:(.*)\ *Mask:(.*)", line)

if m is not None:

ipAddr = m.group(1).rstrip(" ")

netmask = m.group(3).rstrip(" ")

if networkConfig.isBridgePort(dev):

type = "brport"

elif networkConfig.isBridge(dev):

type = "bridge"

else:

type = "dev"

return networkConfig.devInfo(macAddr, ipAddr, netmask, None, type, dev)