code.vuplus.com Git - vuplus_dvbapp/blob - lib/python/Components/Network.py

   1 from os import system, popen, path as os_path, listdir
   2 from re import compile as re_compile, search as re_search
   3 from socket import *
   4 from enigma import eConsoleAppContainer
   5 from Components.Console import Console
   6
   7 class Network:
   8         def __init__(self):
   9                 self.ifaces = {}
  10                 self.configuredInterfaces = []
  11                 self.configuredNetworkAdapters = []
  12                 self.NetworkState = 0
  13                 self.DnsState = 0
  14                 self.nameservers = []
  15                 self.ethtool_bin = "/usr/sbin/ethtool"
  16                 self.container = eConsoleAppContainer()
  17                 self.Console = Console()
  18                 self.LinkConsole = Console()
  19                 self.restartConsole = Console()
  20                 self.deactivateConsole = Console()
  21                 self.activateConsole = Console()
  22                 self.resetNetworkConsole = Console()
  23                 self.getInterfaces()
  24
  25         def getInterfaces(self, callback = None):
  26                 devicesPattern = re_compile('[a-z]+[0-9]+')
  27                 self.configuredInterfaces = []
  28                 fp = file('/proc/net/dev', 'r')
  29                 result = fp.readlines()
  30                 fp.close()
  31                 for line in result:
  32                         try:
  33                                 device = devicesPattern.search(line).group()
  34                                 if device == 'wifi0':
  35                                         continue
  36                                 self.getDataForInterface(device, callback)
  37                         except AttributeError:
  38                                 pass
  39                 #print "self.ifaces:", self.ifaces
  40                 #self.writeNetworkConfig()
  41                 #print ord(' ')
  42                 #for line in result:
  43                 #       print ord(line[0])
  44
  45         # helper function
  46         def regExpMatch(self, pattern, string):
  47                 if string is None:
  48                         return None
  49                 try:
  50                         return pattern.search(string).group()
  51                 except AttributeError:
  52                         None
  53
  54         # helper function to convert ips from a sring to a list of ints
  55         def convertIP(self, ip):
  56                 strIP = ip.split('.')
  57                 ip = []
  58                 for x in strIP:
  59                         ip.append(int(x))
  60                 return ip
  61
  62         def getDataForInterface(self, iface,callback):
  63                 #get ip out of ip addr, as avahi sometimes overrides it in ifconfig.
  64                 cmd = "ip -o addr"
  65                 self.Console.ePopen(cmd, self.IPaddrFinished, [iface,callback])
  66
  67         def IPaddrFinished(self, result, retval, extra_args):
  68                 (iface, callback ) = extra_args
  69                 data = { 'up': False, 'dhcp': False, 'preup' : False, 'postdown' : False }
  70                 globalIPpattern = re_compile("scope global")
  71                 ipRegexp = '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
  72                 netRegexp = '[0-9]{1,2}'
  73                 macRegexp = '[0-9]{2}\:[0-9]{2}\:[0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}'
  74                 ipLinePattern = re_compile('inet ' + ipRegexp + '/')
  75                 ipPattern = re_compile(ipRegexp)
  76                 netmaskLinePattern = re_compile('/' + netRegexp + ' brd ')
  77                 netmaskPattern = re_compile(netRegexp)
  78                 bcastLinePattern = re_compile(' brd ' + ipRegexp)
  79                 upPattern = re_compile('UP')
  80                 macPattern = re_compile('[0-9]{2}\:[0-9]{2}\:[0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}')
  81                 macLinePattern = re_compile('link/ether ' + macRegexp)
  82
  83                 for line in result.splitlines():
  84                         split = line.strip().split(' ',2)
  85                         if (split[1][:-1] == iface):
  86                                 up = self.regExpMatch(upPattern, split[2])
  87                                 mac = self.regExpMatch(macPattern, self.regExpMatch(macLinePattern, split[2]))
  88                                 if up is not None:
  89                                         data['up'] = True
  90                                         if iface is not 'lo':
  91                                                 self.configuredInterfaces.append(iface)
  92                                 if mac is not None:
  93                                         data['mac'] = mac
  94                         if (split[1] == iface):
  95                                 if re_search(globalIPpattern, split[2]):
  96                                         ip = self.regExpMatch(ipPattern, self.regExpMatch(ipLinePattern, split[2]))
  97                                         netmask = self.calc_netmask(self.regExpMatch(netmaskPattern, self.regExpMatch(netmaskLinePattern, split[2])))
  98                                         bcast = self.regExpMatch(ipPattern, self.regExpMatch(bcastLinePattern, split[2]))
  99                                         if ip is not None:
 100                                                 data['ip'] = self.convertIP(ip)
 101                                         if netmask is not None:
 102                                                 data['netmask'] = self.convertIP(netmask)
 103                                         if bcast is not None:
 104                                                 data['bcast'] = self.convertIP(bcast)
 105
 106                 if not data.has_key('ip'):
 107                         data['dhcp'] = True
 108                         data['ip'] = [0, 0, 0, 0]
 109                         data['netmask'] = [0, 0, 0, 0]
 110                         data['gateway'] = [0, 0, 0, 0]
 111
 112                 cmd = "route -n | grep  " + iface
 113                 self.Console.ePopen(cmd,self.routeFinished, [iface, data, callback])
 114
 115         def routeFinished(self, result, retval, extra_args):
 116                 (iface, data, callback) = extra_args
 117                 ipRegexp = '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
 118                 ipPattern = re_compile(ipRegexp)
 119                 ipLinePattern = re_compile(ipRegexp)
 120
 121                 for line in result.splitlines():
 122                         print line[0:7]
 123                         if line[0:7] == "0.0.0.0":
 124                                 gateway = self.regExpMatch(ipPattern, line[16:31])
 125                                 if gateway is not None:
 126                                         data['gateway'] = self.convertIP(gateway)
 127
 128                 self.ifaces[iface] = data
 129                 self.loadNetworkConfig(iface,callback)
 130
 131         def writeNetworkConfig(self):
 132                 self.configuredInterfaces = []
 133                 fp = file('/etc/network/interfaces', 'w')
 134                 fp.write("# automatically generated by enigma 2\n# do NOT change manually!\n\n")
 135                 fp.write("auto lo\n")
 136                 fp.write("iface lo inet loopback\n\n")
 137                 for ifacename, iface in self.ifaces.items():
 138                         if iface['up'] == True:
 139                                 fp.write("auto " + ifacename + "\n")
 140                                 self.configuredInterfaces.append(ifacename)
 141                         if iface['dhcp'] == True:
 142                                 fp.write("iface "+ ifacename +" inet dhcp\n")
 143                         if iface['dhcp'] == False:
 144                                 fp.write("iface "+ ifacename +" inet static\n")
 145                                 if iface.has_key('ip'):
 146                                         print tuple(iface['ip'])
 147                                         fp.write("      address %d.%d.%d.%d\n" % tuple(iface['ip']))
 148                                         fp.write("      netmask %d.%d.%d.%d\n" % tuple(iface['netmask']))
 149                                         if iface.has_key('gateway'):
 150                                                 fp.write("      gateway %d.%d.%d.%d\n" % tuple(iface['gateway']))
 151                         if iface.has_key("configStrings"):
 152                                 fp.write("\n" + iface["configStrings"] + "\n")
 153                         if iface["preup"] is not False and not iface.has_key("configStrings"):
 154                                 fp.write(iface["preup"])
 155                                 fp.write(iface["postdown"])
 156                         fp.write("\n")
 157                 fp.close()
 158                 self.writeNameserverConfig()
 159
 160         def writeNameserverConfig(self):
 161                 fp = file('/etc/resolv.conf', 'w')
 162                 for nameserver in self.nameservers:
 163                         fp.write("nameserver %d.%d.%d.%d\n" % tuple(nameserver))
 164                 fp.close()
 165
 166         def loadNetworkConfig(self,iface,callback = None):
 167                 interfaces = []
 168                 # parse the interfaces-file
 169                 try:
 170                         fp = file('/etc/network/interfaces', 'r')
 171                         interfaces = fp.readlines()
 172                         fp.close()
 173                 except:
 174                         print "[Network.py] interfaces - opening failed"
 175
 176                 ifaces = {}
 177                 currif = ""
 178                 for i in interfaces:
 179                         split = i.strip().split(' ')
 180                         if (split[0] == "iface"):
 181                                 currif = split[1]
 182                                 ifaces[currif] = {}
 183                                 if (len(split) == 4 and split[3] == "dhcp"):
 184                                         ifaces[currif]["dhcp"] = True
 185                                 else:
 186                                         ifaces[currif]["dhcp"] = False
 187                         if (currif == iface): #read information only for available interfaces
 188                                 if (split[0] == "address"):
 189                                         ifaces[currif]["address"] = map(int, split[1].split('.'))
 190                                         if self.ifaces[currif].has_key("ip"):
 191                                                 if self.ifaces[currif]["ip"] != ifaces[currif]["address"] and ifaces[currif]["dhcp"] == False:
 192                                                         self.ifaces[currif]["ip"] = map(int, split[1].split('.'))
 193                                 if (split[0] == "netmask"):
 194                                         ifaces[currif]["netmask"] = map(int, split[1].split('.'))
 195                                         if self.ifaces[currif].has_key("netmask"):
 196                                                 if self.ifaces[currif]["netmask"] != ifaces[currif]["netmask"] and ifaces[currif]["dhcp"] == False:
 197                                                         self.ifaces[currif]["netmask"] = map(int, split[1].split('.'))
 198                                 if (split[0] == "gateway"):
 199                                         ifaces[currif]["gateway"] = map(int, split[1].split('.'))
 200                                         if self.ifaces[currif].has_key("gateway"):
 201                                                 if self.ifaces[currif]["gateway"] != ifaces[currif]["gateway"] and ifaces[currif]["dhcp"] == False:
 202                                                         self.ifaces[currif]["gateway"] = map(int, split[1].split('.'))
 203                                 if (split[0] == "pre-up"):
 204                                         if self.ifaces[currif].has_key("preup"):
 205                                                 self.ifaces[currif]["preup"] = i
 206                                 if (split[0] == "post-down"):
 207                                         if self.ifaces[currif].has_key("postdown"):
 208                                                 self.ifaces[currif]["postdown"] = i
 209
 210                 for ifacename, iface in ifaces.items():
 211                         if self.ifaces.has_key(ifacename):
 212                                 self.ifaces[ifacename]["dhcp"] = iface["dhcp"]
 213                 if len(self.Console.appContainers) == 0:
 214                         # save configured interfacelist
 215                         self.configuredNetworkAdapters = self.configuredInterfaces
 216                         # load ns only once
 217                         self.loadNameserverConfig()
 218                         print "read configured interfac:", ifaces
 219                         print "self.ifaces after loading:", self.ifaces
 220                         if callback is not None:
 221                                 callback(True)
 222
 223         def loadNameserverConfig(self):
 224                 ipRegexp = "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
 225                 nameserverPattern = re_compile("nameserver +" + ipRegexp)
 226                 ipPattern = re_compile(ipRegexp)
 227
 228                 resolv = []
 229                 try:
 230                         fp = file('/etc/resolv.conf', 'r')
 231                         resolv = fp.readlines()
 232                         fp.close()
 233                         self.nameservers = []
 234                 except:
 235                         print "[Network.py] resolv.conf - opening failed"
 236
 237                 for line in resolv:
 238                         if self.regExpMatch(nameserverPattern, line) is not None:
 239                                 ip = self.regExpMatch(ipPattern, line)
 240                                 if ip is not None:
 241                                         self.nameservers.append(self.convertIP(ip))
 242
 243                 print "nameservers:", self.nameservers
 244
 245         def deactivateNetworkConfig(self, callback = None):
 246                 self.deactivateConsole = Console()
 247                 self.commands = []
 248                 self.commands.append("/etc/init.d/avahi-daemon stop")
 249                 for iface in self.ifaces.keys():
 250                         cmd = "ip addr flush " + iface
 251                         self.commands.append(cmd)
 252                 self.commands.append("/etc/init.d/networking stop")
 253                 self.commands.append("killall -9 udhcpc")
 254                 self.commands.append("rm /var/run/udhcpc*")
 255                 self.deactivateConsole.eBatch(self.commands, self.deactivateNetworkFinished, callback, debug=True)
 256
 257         def deactivateNetworkFinished(self,extra_args):
 258                 callback = extra_args
 259                 if len(self.deactivateConsole.appContainers) == 0:
 260                         if callback is not None:
 261                                 callback(True)
 262
 263         def activateNetworkConfig(self, callback = None):
 264                 self.activateConsole = Console()
 265                 self.commands = []
 266                 self.commands.append("/etc/init.d/networking start")
 267                 self.commands.append("/etc/init.d/avahi-daemon start")
 268                 self.activateConsole.eBatch(self.commands, self.activateNetworkFinished, callback, debug=True)
 269
 270         def activateNetworkFinished(self,extra_args):
 271                 callback = extra_args
 272                 if len(self.activateConsole.appContainers) == 0:
 273                         if callback is not None:
 274                                 callback(True)
 275
 276         def getConfiguredAdapters(self):
 277                 return self.configuredNetworkAdapters
 278
 279         def getNumberOfAdapters(self):
 280                 return len(self.ifaces)
 281
 282         def getFriendlyAdapterName(self, x):
 283                 # maybe this needs to be replaced by an external list.
 284                 friendlyNames = {
 285                         "eth0": _("Integrated Ethernet"),
 286                         "wlan0": _("Wireless"),
 287                         "ath0": _("Integrated Wireless")
 288                 }
 289                 return friendlyNames.get(x, x) # when we have no friendly name, use adapter name
 290
 291         def getAdapterName(self, iface):
 292                 return iface
 293
 294         def getAdapterList(self):
 295                 return self.ifaces.keys()
 296
 297         def getAdapterAttribute(self, iface, attribute):
 298                 if self.ifaces.has_key(iface):
 299                         if self.ifaces[iface].has_key(attribute):
 300                                 return self.ifaces[iface][attribute]
 301                 return None
 302
 303         def setAdapterAttribute(self, iface, attribute, value):
 304                 print "setting for adapter", iface, "attribute", attribute, " to value", value
 305                 if self.ifaces.has_key(iface):
 306                         self.ifaces[iface][attribute] = value
 307
 308         def removeAdapterAttribute(self, iface, attribute):
 309                 if self.ifaces.has_key(iface):
 310                         if self.ifaces[iface].has_key(attribute):
 311                                 del self.ifaces[iface][attribute]
 312
 313         def getNameserverList(self):
 314                 if len(self.nameservers) == 0:
 315                         return [[0, 0, 0, 0], [0, 0, 0, 0]]
 316                 else:
 317                         return self.nameservers
 318
 319         def clearNameservers(self):
 320                 self.nameservers = []
 321
 322         def addNameserver(self, nameserver):
 323                 if nameserver not in self.nameservers:
 324                         self.nameservers.append(nameserver)
 325
 326         def removeNameserver(self, nameserver):
 327                 if nameserver in self.nameservers:
 328                         self.nameservers.remove(nameserver)
 329
 330         def changeNameserver(self, oldnameserver, newnameserver):
 331                 if oldnameserver in self.nameservers:
 332                         for i in range(len(self.nameservers)):
 333                                 if self.nameservers[i] == oldnameserver:
 334                                         self.nameservers[i] = newnameserver
 335
 336         def resetNetworkConfig(self, mode='lan', callback = None):
 337                 self.resetNetworkConsole = Console()
 338                 self.commands = []
 339                 self.commands.append("/etc/init.d/avahi-daemon stop")
 340                 for iface in self.ifaces.keys():
 341                         cmd = "ip addr flush " + iface
 342                         self.commands.append(cmd)
 343                 self.commands.append("/etc/init.d/networking stop")
 344                 self.commands.append("killall -9 udhcpc")
 345                 self.commands.append("rm /var/run/udhcpc*")
 346                 self.resetNetworkConsole.eBatch(self.commands, self.resetNetworkFinishedCB, [mode, callback], debug=True)
 347
 348         def resetNetworkFinishedCB(self, extra_args):
 349                 (mode, callback) = extra_args
 350                 if len(self.resetNetworkConsole.appContainers) == 0:
 351                         self.writeDefaultNetworkConfig(mode, callback)
 352
 353         def writeDefaultNetworkConfig(self,mode='lan', callback = None):
 354                 fp = file('/etc/network/interfaces', 'w')
 355                 fp.write("# automatically generated by enigma 2\n# do NOT change manually!\n\n")
 356                 fp.write("auto lo\n")
 357                 fp.write("iface lo inet loopback\n\n")
 358                 if mode == 'wlan':
 359                         fp.write("auto wlan0\n")
 360                         fp.write("iface wlan0 inet dhcp\n")
 361                 if mode == 'wlan-mpci':
 362                         fp.write("auto ath0\n")
 363                         fp.write("iface ath0 inet dhcp\n")
 364                 if mode == 'lan':
 365                         fp.write("auto eth0\n")
 366                         fp.write("iface eth0 inet dhcp\n")
 367                 fp.write("\n")
 368                 fp.close()
 369
 370                 self.resetNetworkConsole = Console()
 371                 self.commands = []
 372                 if mode == 'wlan':
 373                         self.commands.append("ifconfig eth0 down")
 374                         self.commands.append("ifconfig ath0 down")
 375                         self.commands.append("ifconfig wlan0 up")
 376                 if mode == 'wlan-mpci':
 377                         self.commands.append("ifconfig eth0 down")
 378                         self.commands.append("ifconfig wlan0 down")
 379                         self.commands.append("ifconfig ath0 up")
 380                 if mode == 'lan':
 381                         self.commands.append("ifconfig eth0 up")
 382                         self.commands.append("ifconfig wlan0 down")
 383                         self.commands.append("ifconfig ath0 down")
 384                 self.commands.append("/etc/init.d/avahi-daemon start")
 385                 self.resetNetworkConsole.eBatch(self.commands, self.resetNetworkFinished, [mode,callback], debug=True)
 386
 387         def resetNetworkFinished(self,extra_args):
 388                 (mode, callback) = extra_args
 389                 if len(self.resetNetworkConsole.appContainers) == 0:
 390                         if callback is not None:
 391                                 callback(True,mode)
 392
 393         def checkNetworkState(self,statecallback):
 394                 # www.dream-multimedia-tv.de, www.heise.de, www.google.de
 395                 cmd1 = "ping -c 1 82.149.226.170"
 396                 cmd2 = "ping -c 1 193.99.144.85"
 397                 cmd3 = "ping -c 1 209.85.135.103"
 398                 self.PingConsole = Console()
 399                 self.PingConsole.ePopen(cmd1, self.checkNetworkStateFinished,statecallback)
 400                 self.PingConsole.ePopen(cmd2, self.checkNetworkStateFinished,statecallback)
 401                 self.PingConsole.ePopen(cmd3, self.checkNetworkStateFinished,statecallback)
 402
 403         def checkNetworkStateFinished(self, result, retval,extra_args):
 404                 (statecallback) = extra_args
 405                 if self.PingConsole is not None:
 406                         if retval == 0:
 407                                 self.PingConsole = None
 408                                 statecallback(self.NetworkState)
 409                         else:
 410                                 self.NetworkState += 1
 411                                 if len(self.PingConsole.appContainers) == 0:
 412                                         statecallback(self.NetworkState)
 413
 414         def restartNetwork(self,callback):
 415                 self.restartConsole = Console()
 416                 self.commands = []
 417                 self.commands.append("/etc/init.d/avahi-daemon stop")
 418                 for iface in self.ifaces.keys():
 419                         cmd = "ip addr flush " + iface
 420                         self.commands.append(cmd)
 421                 self.commands.append("/etc/init.d/networking stop")
 422                 self.commands.append("killall -9 udhcpc")
 423                 self.commands.append("rm /var/run/udhcpc*")
 424                 self.commands.append("/etc/init.d/networking start")
 425                 self.commands.append("/etc/init.d/avahi-daemon start")
 426                 self.restartConsole.eBatch(self.commands, self.restartNetworkFinished, callback, debug=True)
 427
 428         def restartNetworkFinished(self,extra_args):
 429                 callback = extra_args
 430                 if len(self.restartConsole.appContainers) == 0:
 431                         callback(True)
 432
 433         def getLinkState(self,iface,callback):
 434                 cmd = self.ethtool_bin + " " + iface
 435                 self.LinkConsole = Console()
 436                 self.LinkConsole.ePopen(cmd, self.getLinkStateFinished,callback)
 437
 438         def getLinkStateFinished(self, result, retval,extra_args):
 439                 (callback) = extra_args
 440                 if self.LinkConsole is not None:
 441                         if len(self.LinkConsole.appContainers) == 0:
 442                                 callback(result)
 443
 444         def stopLinkStateConsole(self):
 445                 if self.LinkConsole is not None:
 446                         self.LinkConsole = None
 447
 448         def stopRestartConsole(self):
 449                 if self.restartConsole is not None:
 450                         self.restartConsole = None
 451
 452         def RestartConsoleRunning(self):
 453                 if self.restartConsole is not None:
 454                         if len(self.restartConsole.appContainers) == 0:
 455                                 return False
 456                         else:
 457                                 return True
 458
 459         def checkforInterface(self,iface):
 460                 if self.getAdapterAttribute(iface, 'up') is True:
 461                         return True
 462                 else:
 463                         ret=system("ifconfig " + iface + " up")
 464                         system("ifconfig " + iface + " down")
 465                         if ret == 0:
 466                                 return True
 467                         else:
 468                                 return False
 469
 470         def checkDNSLookup(self,statecallback):
 471                 cmd1 = "nslookup www.dream-multimedia-tv.de"
 472                 cmd2 = "nslookup www.heise.de"
 473                 cmd3 = "nslookup www.google.de"
 474                 self.DnsConsole = Console()
 475                 self.DnsConsole.ePopen(cmd1, self.checkDNSLookupFinished,statecallback)
 476                 self.DnsConsole.ePopen(cmd2, self.checkDNSLookupFinished,statecallback)
 477                 self.DnsConsole.ePopen(cmd3, self.checkDNSLookupFinished,statecallback)
 478
 479         def checkDNSLookupFinished(self, result, retval,extra_args):
 480                 (statecallback) = extra_args
 481                 if self.DnsConsole is not None:
 482                         if retval == 0:
 483                                 self.DnsConsole = None
 484                                 statecallback(self.DnsState)
 485                         else:
 486                                 self.DnsState += 1
 487                                 if len(self.DnsConsole.appContainers) == 0:
 488                                         statecallback(self.DnsState)
 489
 490         def deactivateInterface(self,iface):
 491                 self.deactivateInterfaceConsole = Console()
 492                 self.commands = []
 493                 cmd1 = "ip addr flush " + iface
 494                 cmd2 = "ifconfig " + iface + " down"
 495                 self.commands.append(cmd1)
 496                 self.commands.append(cmd2)
 497                 self.deactivateInterfaceConsole.eBatch(self.commands, self.deactivateInterfaceFinished, extra_args = None, debug=True)
 498
 499         def deactivateInterfaceFinished(self,extra_args):
 500                 pass
 501
 502         def detectWlanModule(self):
 503                 self.wlanmodule = None
 504                 rt73_dir = "/sys/bus/usb/drivers/rt73/"
 505                 zd1211b_dir = "/sys/bus/usb/drivers/zd1211b/"
 506                 madwifi_dir = "/sys/bus/pci/drivers/ath_pci/"
 507                 if os_path.exists(madwifi_dir):
 508                         files = listdir(madwifi_dir)
 509                         if len(files) >= 1:
 510                                 self.wlanmodule = 'madwifi'
 511                 if os_path.exists(rt73_dir):
 512                         rtfiles = listdir(rt73_dir)
 513                         if len(rtfiles) == 2:
 514                                 self.wlanmodule = 'ralink'
 515                 if os_path.exists(zd1211b_dir):
 516                         zdfiles = listdir(zd1211b_dir)
 517                         if len(zdfiles) == 1:
 518                                 self.wlanmodule = 'zydas'
 519                 return self.wlanmodule
 520
 521         def calc_netmask(self,nmask):
 522                 from struct import pack, unpack
 523                 from socket import inet_ntoa, inet_aton
 524                 mask = 1L<<31
 525                 xnet = (1L<<32)-1
 526                 cidr_range = range(0, 32)
 527                 cidr = long(nmask)
 528                 if cidr not in cidr_range:
 529                         print 'cidr invalid: %d' % cidr
 530                         return None
 531                 else:
 532                         nm = ((1L<<cidr)-1)<<(32-cidr)
 533                         netmask = str(inet_ntoa(pack('>L', nm)))
 534                         return netmask
 535
 536 iNetwork = Network()
 537
 538 def InitNetwork():
 539         pass