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.deactivateInterfaceConsole = Console()
  22                 self.activateConsole = Console()
  23                 self.resetNetworkConsole = Console()
  24                 self.DnsConsole = Console()
  25                 self.getInterfaces()
  26
  27         def getInterfaces(self, callback = None):
  28                 devicesPattern = re_compile('[a-z]+[0-9]+')
  29                 self.configuredInterfaces = []
  30                 fp = file('/proc/net/dev', 'r')
  31                 result = fp.readlines()
  32                 fp.close()
  33                 for line in result:
  34                         try:
  35                                 device = devicesPattern.search(line).group()
  36                                 if device == 'wifi0':
  37                                         continue
  38                                 self.getDataForInterface(device, callback)
  39                         except AttributeError:
  40                                 pass
  41                 #print "self.ifaces:", self.ifaces
  42                 #self.writeNetworkConfig()
  43                 #print ord(' ')
  44                 #for line in result:
  45                 #       print ord(line[0])
  46
  47         # helper function
  48         def regExpMatch(self, pattern, string):
  49                 if string is None:
  50                         return None
  51                 try:
  52                         return pattern.search(string).group()
  53                 except AttributeError:
  54                         None
  55
  56         # helper function to convert ips from a sring to a list of ints
  57         def convertIP(self, ip):
  58                 strIP = ip.split('.')
  59                 ip = []
  60                 for x in strIP:
  61                         ip.append(int(x))
  62                 return ip
  63
  64         def getDataForInterface(self, iface,callback):
  65                 #get ip out of ip addr, as avahi sometimes overrides it in ifconfig.
  66                 cmd = "ip -o addr"
  67                 self.Console.ePopen(cmd, self.IPaddrFinished, [iface,callback])
  68
  69         def IPaddrFinished(self, result, retval, extra_args):
  70                 (iface, callback ) = extra_args
  71                 data = { 'up': False, 'dhcp': False, 'preup' : False, 'postdown' : False }
  72                 globalIPpattern = re_compile("scope global")
  73                 ipRegexp = '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
  74                 netRegexp = '[0-9]{1,2}'
  75                 macRegexp = '[0-9]{2}\:[0-9]{2}\:[0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}'
  76                 ipLinePattern = re_compile('inet ' + ipRegexp + '/')
  77                 ipPattern = re_compile(ipRegexp)
  78                 netmaskLinePattern = re_compile('/' + netRegexp)
  79                 netmaskPattern = re_compile(netRegexp)
  80                 bcastLinePattern = re_compile(' brd ' + ipRegexp)
  81                 upPattern = re_compile('UP')
  82                 macPattern = re_compile('[0-9]{2}\:[0-9]{2}\:[0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}\:[a-z0-9]{2}')
  83                 macLinePattern = re_compile('link/ether ' + macRegexp)
  84
  85                 for line in result.splitlines():
  86                         split = line.strip().split(' ',2)
  87                         if (split[1][:-1] == iface):
  88                                 up = self.regExpMatch(upPattern, split[2])
  89                                 mac = self.regExpMatch(macPattern, self.regExpMatch(macLinePattern, split[2]))
  90                                 if up is not None:
  91                                         data['up'] = True
  92                                         if iface is not 'lo':
  93                                                 self.configuredInterfaces.append(iface)
  94                                 if mac is not None:
  95                                         data['mac'] = mac
  96                         if (split[1] == iface):
  97                                 if re_search(globalIPpattern, split[2]):
  98                                         ip = self.regExpMatch(ipPattern, self.regExpMatch(ipLinePattern, split[2]))
  99                                         netmask = self.calc_netmask(self.regExpMatch(netmaskPattern, self.regExpMatch(netmaskLinePattern, split[2])))
 100                                         bcast = self.regExpMatch(ipPattern, self.regExpMatch(bcastLinePattern, split[2]))
 101                                         if ip is not None:
 102                                                 data['ip'] = self.convertIP(ip)
 103                                         if netmask is not None:
 104                                                 data['netmask'] = self.convertIP(netmask)
 105                                         if bcast is not None:
 106                                                 data['bcast'] = self.convertIP(bcast)
 107
 108                 if not data.has_key('ip'):
 109                         data['dhcp'] = True
 110                         data['ip'] = [0, 0, 0, 0]
 111                         data['netmask'] = [0, 0, 0, 0]
 112                         data['gateway'] = [0, 0, 0, 0]
 113
 114                 cmd = "route -n | grep  " + iface
 115                 self.Console.ePopen(cmd,self.routeFinished, [iface, data, callback])
 116
 117         def routeFinished(self, result, retval, extra_args):
 118                 (iface, data, callback) = extra_args
 119                 ipRegexp = '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
 120                 ipPattern = re_compile(ipRegexp)
 121                 ipLinePattern = re_compile(ipRegexp)
 122
 123                 for line in result.splitlines():
 124                         print line[0:7]
 125                         if line[0:7] == "0.0.0.0":
 126                                 gateway = self.regExpMatch(ipPattern, line[16:31])
 127                                 if gateway is not None:
 128                                         data['gateway'] = self.convertIP(gateway)
 129
 130                 self.ifaces[iface] = data
 131                 self.loadNetworkConfig(iface,callback)
 132
 133         def writeNetworkConfig(self):
 134                 self.configuredInterfaces = []
 135                 fp = file('/etc/network/interfaces', 'w')
 136                 fp.write("# automatically generated by enigma 2\n# do NOT change manually!\n\n")
 137                 fp.write("auto lo\n")
 138                 fp.write("iface lo inet loopback\n\n")
 139                 for ifacename, iface in self.ifaces.items():
 140                         if iface['up'] == True:
 141                                 fp.write("auto " + ifacename + "\n")
 142                                 self.configuredInterfaces.append(ifacename)
 143                         if iface['dhcp'] == True:
 144                                 fp.write("iface "+ ifacename +" inet dhcp\n")
 145                         if iface['dhcp'] == False:
 146                                 fp.write("iface "+ ifacename +" inet static\n")
 147                                 if iface.has_key('ip'):
 148                                         print tuple(iface['ip'])
 149                                         fp.write("      address %d.%d.%d.%d\n" % tuple(iface['ip']))
 150                                         fp.write("      netmask %d.%d.%d.%d\n" % tuple(iface['netmask']))
 151                                         if iface.has_key('gateway'):
 152                                                 fp.write("      gateway %d.%d.%d.%d\n" % tuple(iface['gateway']))
 153                         if iface.has_key("configStrings"):
 154                                 fp.write("\n" + iface["configStrings"] + "\n")
 155                         if iface["preup"] is not False and not iface.has_key("configStrings"):
 156                                 fp.write(iface["preup"])
 157                                 fp.write(iface["postdown"])
 158                         fp.write("\n")
 159                 fp.close()
 160                 self.writeNameserverConfig()
 161
 162         def writeNameserverConfig(self):
 163                 fp = file('/etc/resolv.conf', 'w')
 164                 for nameserver in self.nameservers:
 165                         fp.write("nameserver %d.%d.%d.%d\n" % tuple(nameserver))
 166                 fp.close()
 167
 168         def loadNetworkConfig(self,iface,callback = None):
 169                 interfaces = []
 170                 # parse the interfaces-file
 171                 try:
 172                         fp = file('/etc/network/interfaces', 'r')
 173                         interfaces = fp.readlines()
 174                         fp.close()
 175                 except:
 176                         print "[Network.py] interfaces - opening failed"
 177
 178                 ifaces = {}
 179                 currif = ""
 180                 for i in interfaces:
 181                         split = i.strip().split(' ')
 182                         if (split[0] == "iface"):
 183                                 currif = split[1]
 184                                 ifaces[currif] = {}
 185                                 if (len(split) == 4 and split[3] == "dhcp"):
 186                                         ifaces[currif]["dhcp"] = True
 187                                 else:
 188                                         ifaces[currif]["dhcp"] = False
 189                         if (currif == iface): #read information only for available interfaces
 190                                 if (split[0] == "address"):
 191                                         ifaces[currif]["address"] = map(int, split[1].split('.'))
 192                                         if self.ifaces[currif].has_key("ip"):
 193                                                 if self.ifaces[currif]["ip"] != ifaces[currif]["address"] and ifaces[currif]["dhcp"] == False:
 194                                                         self.ifaces[currif]["ip"] = map(int, split[1].split('.'))
 195                                 if (split[0] == "netmask"):
 196                                         ifaces[currif]["netmask"] = map(int, split[1].split('.'))
 197                                         if self.ifaces[currif].has_key("netmask"):
 198                                                 if self.ifaces[currif]["netmask"] != ifaces[currif]["netmask"] and ifaces[currif]["dhcp"] == False:
 199                                                         self.ifaces[currif]["netmask"] = map(int, split[1].split('.'))
 200                                 if (split[0] == "gateway"):
 201                                         ifaces[currif]["gateway"] = map(int, split[1].split('.'))
 202                                         if self.ifaces[currif].has_key("gateway"):
 203                                                 if self.ifaces[currif]["gateway"] != ifaces[currif]["gateway"] and ifaces[currif]["dhcp"] == False:
 204                                                         self.ifaces[currif]["gateway"] = map(int, split[1].split('.'))
 205                                 if (split[0] == "pre-up"):
 206                                         if self.ifaces[currif].has_key("preup"):
 207                                                 self.ifaces[currif]["preup"] = i
 208                                 if (split[0] == "post-down"):
 209                                         if self.ifaces[currif].has_key("postdown"):
 210                                                 self.ifaces[currif]["postdown"] = i
 211
 212                 for ifacename, iface in ifaces.items():
 213                         if self.ifaces.has_key(ifacename):
 214                                 self.ifaces[ifacename]["dhcp"] = iface["dhcp"]
 215                 if len(self.Console.appContainers) == 0:
 216                         # save configured interfacelist
 217                         self.configuredNetworkAdapters = self.configuredInterfaces
 218                         # load ns only once
 219                         self.loadNameserverConfig()
 220                         print "read configured interfac:", ifaces
 221                         print "self.ifaces after loading:", self.ifaces
 222                         if callback is not None:
 223                                 callback(True)
 224
 225         def loadNameserverConfig(self):
 226                 ipRegexp = "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
 227                 nameserverPattern = re_compile("nameserver +" + ipRegexp)
 228                 ipPattern = re_compile(ipRegexp)
 229
 230                 resolv = []
 231                 try:
 232                         fp = file('/etc/resolv.conf', 'r')
 233                         resolv = fp.readlines()
 234                         fp.close()
 235                         self.nameservers = []
 236                 except:
 237                         print "[Network.py] resolv.conf - opening failed"
 238
 239                 for line in resolv:
 240                         if self.regExpMatch(nameserverPattern, line) is not None:
 241                                 ip = self.regExpMatch(ipPattern, line)
 242                                 if ip is not None:
 243                                         self.nameservers.append(self.convertIP(ip))
 244
 245                 print "nameservers:", self.nameservers
 246
 247         def deactivateNetworkConfig(self, callback = None):
 248                 self.deactivateConsole = Console()
 249                 self.commands = []
 250                 self.commands.append("/etc/init.d/avahi-daemon stop")
 251                 for iface in self.ifaces.keys():
 252                         cmd = "ip addr flush " + iface
 253                         self.commands.append(cmd)
 254                 self.commands.append("/etc/init.d/networking stop")
 255                 self.commands.append("killall -9 udhcpc")
 256                 self.commands.append("rm /var/run/udhcpc*")
 257                 self.deactivateConsole.eBatch(self.commands, self.deactivateNetworkFinished, callback, debug=True)
 258
 259         def deactivateNetworkFinished(self,extra_args):
 260                 callback = extra_args
 261                 if len(self.deactivateConsole.appContainers) == 0:
 262                         if callback is not None:
 263                                 callback(True)
 264
 265         def activateNetworkConfig(self, callback = None):
 266                 self.activateConsole = Console()
 267                 self.commands = []
 268                 self.commands.append("/etc/init.d/networking start")
 269                 self.commands.append("/etc/init.d/avahi-daemon start")
 270                 self.activateConsole.eBatch(self.commands, self.activateNetworkFinished, callback, debug=True)
 271
 272         def activateNetworkFinished(self,extra_args):
 273                 callback = extra_args
 274                 if len(self.activateConsole.appContainers) == 0:
 275                         if callback is not None:
 276                                 callback(True)
 277
 278         def getConfiguredAdapters(self):
 279                 return self.configuredNetworkAdapters
 280
 281         def getNumberOfAdapters(self):
 282                 return len(self.ifaces)
 283
 284         def getFriendlyAdapterName(self, x):
 285                 # maybe this needs to be replaced by an external list.
 286                 friendlyNames = {
 287                         "eth0": _("Integrated Ethernet"),
 288                         "wlan0": _("Wireless"),
 289                         "ath0": _("Integrated Wireless")
 290                 }
 291                 return friendlyNames.get(x, x) # when we have no friendly name, use adapter name
 292
 293         def getAdapterName(self, iface):
 294                 return iface
 295
 296         def getAdapterList(self):
 297                 return self.ifaces.keys()
 298
 299         def getAdapterAttribute(self, iface, attribute):
 300                 if self.ifaces.has_key(iface):
 301                         if self.ifaces[iface].has_key(attribute):
 302                                 return self.ifaces[iface][attribute]
 303                 return None
 304
 305         def setAdapterAttribute(self, iface, attribute, value):
 306                 print "setting for adapter", iface, "attribute", attribute, " to value", value
 307                 if self.ifaces.has_key(iface):
 308                         self.ifaces[iface][attribute] = value
 309
 310         def removeAdapterAttribute(self, iface, attribute):
 311                 if self.ifaces.has_key(iface):
 312                         if self.ifaces[iface].has_key(attribute):
 313                                 del self.ifaces[iface][attribute]
 314
 315         def getNameserverList(self):
 316                 if len(self.nameservers) == 0:
 317                         return [[0, 0, 0, 0], [0, 0, 0, 0]]
 318                 else:
 319                         return self.nameservers
 320
 321         def clearNameservers(self):
 322                 self.nameservers = []
 323
 324         def addNameserver(self, nameserver):
 325                 if nameserver not in self.nameservers:
 326                         self.nameservers.append(nameserver)
 327
 328         def removeNameserver(self, nameserver):
 329                 if nameserver in self.nameservers:
 330                         self.nameservers.remove(nameserver)
 331
 332         def changeNameserver(self, oldnameserver, newnameserver):
 333                 if oldnameserver in self.nameservers:
 334                         for i in range(len(self.nameservers)):
 335                                 if self.nameservers[i] == oldnameserver:
 336                                         self.nameservers[i] = newnameserver
 337
 338         def resetNetworkConfig(self, mode='lan', callback = None):
 339                 self.resetNetworkConsole = Console()
 340                 self.commands = []
 341                 self.commands.append("/etc/init.d/avahi-daemon stop")
 342                 for iface in self.ifaces.keys():
 343                         cmd = "ip addr flush " + iface
 344                         self.commands.append(cmd)
 345                 self.commands.append("/etc/init.d/networking stop")
 346                 self.commands.append("killall -9 udhcpc")
 347                 self.commands.append("rm /var/run/udhcpc*")
 348                 self.resetNetworkConsole.eBatch(self.commands, self.resetNetworkFinishedCB, [mode, callback], debug=True)
 349
 350         def resetNetworkFinishedCB(self, extra_args):
 351                 (mode, callback) = extra_args
 352                 if len(self.resetNetworkConsole.appContainers) == 0:
 353                         self.writeDefaultNetworkConfig(mode, callback)
 354
 355         def writeDefaultNetworkConfig(self,mode='lan', callback = None):
 356                 fp = file('/etc/network/interfaces', 'w')
 357                 fp.write("# automatically generated by enigma 2\n# do NOT change manually!\n\n")
 358                 fp.write("auto lo\n")
 359                 fp.write("iface lo inet loopback\n\n")
 360                 if mode == 'wlan':
 361                         fp.write("auto wlan0\n")
 362                         fp.write("iface wlan0 inet dhcp\n")
 363                 if mode == 'wlan-mpci':
 364                         fp.write("auto ath0\n")
 365                         fp.write("iface ath0 inet dhcp\n")
 366                 if mode == 'lan':
 367                         fp.write("auto eth0\n")
 368                         fp.write("iface eth0 inet dhcp\n")
 369                 fp.write("\n")
 370                 fp.close()
 371
 372                 self.resetNetworkConsole = Console()
 373                 self.commands = []
 374                 if mode == 'wlan':
 375                         self.commands.append("ifconfig eth0 down")
 376                         self.commands.append("ifconfig ath0 down")
 377                         self.commands.append("ifconfig wlan0 up")
 378                 if mode == 'wlan-mpci':
 379                         self.commands.append("ifconfig eth0 down")
 380                         self.commands.append("ifconfig wlan0 down")
 381                         self.commands.append("ifconfig ath0 up")
 382                 if mode == 'lan':
 383                         self.commands.append("ifconfig eth0 up")
 384                         self.commands.append("ifconfig wlan0 down")
 385                         self.commands.append("ifconfig ath0 down")
 386                 self.commands.append("/etc/init.d/avahi-daemon start")
 387                 self.resetNetworkConsole.eBatch(self.commands, self.resetNetworkFinished, [mode,callback], debug=True)
 388
 389         def resetNetworkFinished(self,extra_args):
 390                 (mode, callback) = extra_args
 391                 if len(self.resetNetworkConsole.appContainers) == 0:
 392                         if callback is not None:
 393                                 callback(True,mode)
 394
 395         def checkNetworkState(self,statecallback):
 396                 # www.dream-multimedia-tv.de, www.heise.de, www.google.de
 397                 cmd1 = "ping -c 1 82.149.226.170"
 398                 cmd2 = "ping -c 1 193.99.144.85"
 399                 cmd3 = "ping -c 1 209.85.135.103"
 400                 self.PingConsole = Console()
 401                 self.PingConsole.ePopen(cmd1, self.checkNetworkStateFinished,statecallback)
 402                 self.PingConsole.ePopen(cmd2, self.checkNetworkStateFinished,statecallback)
 403                 self.PingConsole.ePopen(cmd3, self.checkNetworkStateFinished,statecallback)
 404
 405         def checkNetworkStateFinished(self, result, retval,extra_args):
 406                 (statecallback) = extra_args
 407                 if self.PingConsole is not None:
 408                         if retval == 0:
 409                                 self.PingConsole = None
 410                                 statecallback(self.NetworkState)
 411                         else:
 412                                 self.NetworkState += 1
 413                                 if len(self.PingConsole.appContainers) == 0:
 414                                         statecallback(self.NetworkState)
 415
 416         def restartNetwork(self,callback = None):
 417                 self.restartConsole = Console()
 418                 self.commands = []
 419                 self.commands.append("/etc/init.d/avahi-daemon stop")
 420                 for iface in self.ifaces.keys():
 421                         cmd = "ip addr flush " + iface
 422                         self.commands.append(cmd)
 423                 self.commands.append("/etc/init.d/networking stop")
 424                 self.commands.append("killall -9 udhcpc")
 425                 self.commands.append("rm /var/run/udhcpc*")
 426                 self.commands.append("/etc/init.d/networking start")
 427                 self.commands.append("/etc/init.d/avahi-daemon start")
 428                 self.restartConsole.eBatch(self.commands, self.restartNetworkFinished, callback, debug=True)
 429
 430         def restartNetworkFinished(self,extra_args):
 431                 ( callback ) = extra_args
 432                 if callback is not None:
 433                         callback(True)
 434
 435         def getLinkState(self,iface,callback):
 436                 cmd = self.ethtool_bin + " " + iface
 437                 self.LinkConsole = Console()
 438                 self.LinkConsole.ePopen(cmd, self.getLinkStateFinished,callback)
 439
 440         def getLinkStateFinished(self, result, retval,extra_args):
 441                 (callback) = extra_args
 442                 if self.LinkConsole is not None:
 443                         if len(self.LinkConsole.appContainers) == 0:
 444                                 callback(result)
 445
 446         def stopLinkStateConsole(self):
 447                 if self.LinkConsole is not None:
 448                         self.LinkConsole = None
 449
 450         def stopDNSConsole(self):
 451                 if self.DnsConsole is not None:
 452                         self.DnsConsole = None
 453
 454         def stopRestartConsole(self):
 455                 if self.restartConsole is not None:
 456                         self.restartConsole = None
 457
 458         def stopGetInterfacesConsole(self):
 459                 if self.Console is not None:
 460                         self.Console = None
 461
 462         def stopDeactivateInterfaceConsole(self):
 463                 if self.deactivateInterfaceConsole:
 464                         self.deactivateInterfaceConsole = None
 465
 466         def checkforInterface(self,iface):
 467                 if self.getAdapterAttribute(iface, 'up') is True:
 468                         return True
 469                 else:
 470                         ret=system("ifconfig " + iface + " up")
 471                         system("ifconfig " + iface + " down")
 472                         if ret == 0:
 473                                 return True
 474                         else:
 475                                 return False
 476
 477         def checkDNSLookup(self,statecallback):
 478                 cmd1 = "nslookup www.dream-multimedia-tv.de"
 479                 cmd2 = "nslookup www.heise.de"
 480                 cmd3 = "nslookup www.google.de"
 481                 self.DnsConsole = Console()
 482                 self.DnsConsole.ePopen(cmd1, self.checkDNSLookupFinished,statecallback)
 483                 self.DnsConsole.ePopen(cmd2, self.checkDNSLookupFinished,statecallback)
 484                 self.DnsConsole.ePopen(cmd3, self.checkDNSLookupFinished,statecallback)
 485
 486         def checkDNSLookupFinished(self, result, retval,extra_args):
 487                 (statecallback) = extra_args
 488                 if self.DnsConsole is not None:
 489                         if retval == 0:
 490                                 self.DnsConsole = None
 491                                 statecallback(self.DnsState)
 492                         else:
 493                                 self.DnsState += 1
 494                                 if len(self.DnsConsole.appContainers) == 0:
 495                                         statecallback(self.DnsState)
 496
 497         def deactivateInterface(self,iface,callback = None):
 498                 self.deactivateInterfaceConsole = Console()
 499                 self.commands = []
 500                 cmd1 = "ip addr flush " + iface
 501                 cmd2 = "ifconfig " + iface + " down"
 502                 self.commands.append(cmd1)
 503                 self.commands.append(cmd2)
 504                 self.deactivateInterfaceConsole.eBatch(self.commands, self.deactivateInterfaceFinished, callback, debug=True)
 505
 506         def deactivateInterfaceFinished(self,extra_args):
 507                 callback = extra_args
 508                 if self.deactivateInterfaceConsole:
 509                         if len(self.deactivateInterfaceConsole.appContainers) == 0:
 510                                 if callback is not None:
 511                                         callback(True)
 512
 513         def detectWlanModule(self):
 514                 self.wlanmodule = None
 515                 rt73_dir = "/sys/bus/usb/drivers/rt73/"
 516                 zd1211b_dir = "/sys/bus/usb/drivers/zd1211b/"
 517                 madwifi_dir = "/sys/bus/pci/drivers/ath_pci/"
 518                 if os_path.exists(madwifi_dir):
 519                         files = listdir(madwifi_dir)
 520                         if len(files) >= 1:
 521                                 self.wlanmodule = 'madwifi'
 522                 if os_path.exists(rt73_dir):
 523                         rtfiles = listdir(rt73_dir)
 524                         if len(rtfiles) == 2:
 525                                 self.wlanmodule = 'ralink'
 526                 if os_path.exists(zd1211b_dir):
 527                         zdfiles = listdir(zd1211b_dir)
 528                         if len(zdfiles) == 1:
 529                                 self.wlanmodule = 'zydas'
 530                 return self.wlanmodule
 531
 532         def calc_netmask(self,nmask):
 533                 from struct import pack, unpack
 534                 from socket import inet_ntoa, inet_aton
 535                 mask = 1L<<31
 536                 xnet = (1L<<32)-1
 537                 cidr_range = range(0, 32)
 538                 cidr = long(nmask)
 539                 if cidr not in cidr_range:
 540                         print 'cidr invalid: %d' % cidr
 541                         return None
 542                 else:
 543                         nm = ((1L<<cidr)-1)<<(32-cidr)
 544                         netmask = str(inet_ntoa(pack('>L', nm)))
 545                         return netmask
 546
 547 iNetwork = Network()
 548
 549 def InitNetwork():
 550         pass