plnet.py

   1 #!/usr/bin/python /usr/bin/plcsh
   2
   3 import os
   4 import socket
   5 import time
   6 import tempfile
   7 import errno
   8 import struct
   9
  10 import sioc
  11 import modprobe
  12
  13 global version
  14 version = 4.3
  15
  16 def InitInterfaces(logger, plc, data, root="", files_only=False, program="NodeManager"):
  17     global version
  18
  19     sysconfig = "%s/etc/sysconfig/network-scripts" % root
  20     try:
  21         os.makedirs(sysconfig)
  22     except OSError, e:
  23         if e.errno != errno.EEXIST:
  24             raise e
  25
  26     # query running network interfaces
  27     devs = sioc.gifconf()
  28     ips = dict(zip(devs.values(), devs.keys()))
  29     macs = {}
  30     for dev in devs:
  31         macs[sioc.gifhwaddr(dev).lower()] = dev
  32
  33     devices_map = {}
  34     device_id = 1
  35     hostname = data.get('hostname',socket.gethostname())
  36     gateway = None
  37     # assume data['interfaces'] contains this node's Interfaces
  38     # can cope with 4.3 ('networks') or 5.0 ('interfaces')
  39     try:
  40         interfaces = data['interfaces']
  41     except:
  42         interfaces = data['networks']
  43     failedToGetSettings = False
  44
  45     # NOTE: GetInterfaces/NodeNetworks does not necessarily order the interfaces
  46     # returned.  Because 'interface' is decremented as each interface is processed,
  47     # by the time is_primary=True (primary) interface is reached, the device
  48     # "eth%s" % interface, is not eth0.  But, something like eth-4, or eth-12.
  49     # This code sorts the interfaces, placing is_primary=True interfaces first.
  50     # There is a lot of room for improvement to how this
  51     # script handles interfaces and how it chooses the primary interface.
  52     def compare_by (fieldname):
  53         def compare_two_dicts (a, b):
  54             return cmp(a[fieldname], b[fieldname])
  55         return compare_two_dicts
  56
  57     # NOTE: by sorting on 'is_primary' and then reversing (since False is sorted
  58     # before True) all 'is_primary' interfaces are at the beginning of the list.
  59     interfaces.sort( compare_by('is_primary') )
  60     interfaces.reverse()
  61
  62     # The names of the bridge devices
  63     bridgeDevices = []
  64
  65     for interface in interfaces:
  66         logger.verbose('net:InitInterfaces interface %d: %r'%(device_id,interface))
  67         logger.verbose('net:InitInterfaces macs = %r' % macs)
  68         logger.verbose('net:InitInterfaces ips = %r' % ips)
  69         # Get interface name preferably from MAC address, falling back
  70         # on IP address.
  71         hwaddr=interface['mac']
  72         if hwaddr <> None: hwaddr=hwaddr.lower()
  73         if hwaddr in macs:
  74             orig_ifname = macs[hwaddr]
  75         elif interface['ip'] in ips:
  76             orig_ifname = ips[interface['ip']]
  77         else:
  78             orig_ifname = None
  79
  80         if orig_ifname:
  81             logger.verbose('net:InitInterfaces orig_ifname = %s' % orig_ifname)
  82
  83         details = prepDetails(interface, hostname)
  84
  85         if interface['is_primary']:
  86             gateway = interface['gateway']
  87
  88         if 'interface_tag_ids' in interface:
  89             version = 4.3
  90             interface_tag_ids = "interface_tag_ids"
  91             interface_tag_id = "interface_tag_id"
  92             name_key = "tagname"
  93         else:
  94             version = 4.2
  95             interface_tag_ids = "nodenetwork_setting_ids"
  96             interface_tag_id = "nodenetwork_setting_id"
  97             name_key = "name"
  98
  99         if len(interface[interface_tag_ids]) > 0:
 100             try:
 101                 if version == 4.3:
 102                     settings = plc.GetInterfaceTags({interface_tag_id:interface[interface_tag_ids]})
 103                 else:
 104                     settings = plc.GetNodeNetworkSettings({interface_tag_id:interface[interface_tag_ids]})
 105             except:
 106                 logger.log("net:InitInterfaces FATAL: failed call GetInterfaceTags({'interface_tag_id':{%s})"% \
 107                            interface[interface_tag_ids])
 108                 failedToGetSettings = True
 109                 continue # on to the next interface
 110
 111             for setting in settings:
 112                 settingname = setting[name_key].upper()
 113                 if settingname in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER','VLAN'):
 114                     details[settingname]=setting['value']
 115                 # IPv6 support on IPv4 interface
 116                 elif settingname in ('IPV6ADDR','IPV6_DEFAULTGW','IPV6ADDR_SECONDARIES'):
 117                     details[settingname]=setting['value']
 118                     details['IPV6INIT']='yes'
 119                 # wireless settings
 120                 elif settingname in \
 121                         [  "MODE", "ESSID", "NW", "FREQ", "CHANNEL", "SENS", "RATE",
 122                            "KEY", "KEY1", "KEY2", "KEY3", "KEY4", "SECURITYMODE",
 123                            "IWCONFIG", "IWPRIV" ] :
 124                     details [settingname] = setting['value']
 125                     details ['TYPE']='Wireless'
 126                 # Bridge setting
 127                 elif settingname in [ 'BRIDGE' ]:
 128                     details['BRIDGE'] = setting['value']
 129                 elif settingname in [ 'OVS_BRIDGE' ]:
 130                     details['OVS_BRIDGE'] = setting['value']
 131                     details['TYPE'] = "OVSPort"
 132                     details['DEVICETYPE'] = "ovs"
 133                 else:
 134                     logger.log("net:InitInterfaces WARNING: ignored setting named %s"%setting[name_key])
 135
 136         # support aliases to interfaces either by name or HWADDR
 137         if 'ALIAS' in details:
 138             if 'HWADDR' in details:
 139                 hwaddr = details['HWADDR'].lower()
 140                 del details['HWADDR']
 141                 if hwaddr in macs:
 142                     hwifname = macs[hwaddr]
 143                     if ('IFNAME' in details) and details['IFNAME'] <> hwifname:
 144                         logger.log("net:InitInterfaces WARNING: alias ifname (%s) and hwaddr ifname (%s) do not match"%\
 145                                        (details['IFNAME'],hwifname))
 146                         details['IFNAME'] = hwifname
 147                 else:
 148                     logger.log('net:InitInterfaces WARNING: mac addr %s for alias not found' %(hwaddr))
 149
 150             if 'IFNAME' in details:
 151                 # stupid RH /etc/sysconfig/network-scripts/ifup-aliases:new_interface()
 152                 # checks if the "$DEVNUM" only consists of '^[0-9A-Za-z_]*$'. Need to make
 153                 # our aliases compliant.
 154                 parts = details['ALIAS'].split('_')
 155                 isValid=True
 156                 for part in parts:
 157                     isValid=isValid and part.isalnum()
 158
 159                 if isValid:
 160                     devices_map["%s:%s" % (details['IFNAME'],details['ALIAS'])] = details
 161                 else:
 162                     logger.log("net:InitInterfaces WARNING: interface alias (%s) not a valid string for RH ifup-aliases"% details['ALIAS'])
 163             else:
 164                 logger.log("net:InitInterfaces WARNING: interface alias (%s) not matched to an interface"% details['ALIAS'])
 165             device_id -= 1
 166         elif ('BRIDGE' in details or 'OVS_BRIDGE' in details) and 'IFNAME' in details:
 167             # The bridge inherits the mac of the first attached interface.
 168             ifname = details['IFNAME']
 169             device_id -= 1
 170             if 'BRIDGE' in details:
 171                 bridgeName = details['BRIDGE']
 172                 bridgeType = 'Bridge'
 173             else:
 174                 bridgeName = details['OVS_BRIDGE']
 175                 bridgeType = 'OVSBridge'
 176
 177             logger.log('net:InitInterfaces: %s detected. Adding %s to devices_map' % (bridgeType, ifname))
 178             devices_map[ifname] = removeBridgedIfaceDetails(details)
 179
 180             logger.log('net:InitInterfaces: Adding %s %s' % (bridgeType, bridgeName))
 181             bridgeDetails = prepDetails(interface)
 182             bridgeDevices.append(bridgeName)
 183             bridgeDetails['TYPE'] = bridgeType
 184             if bridgeType == 'OVSBridge':
 185                 bridgeDetails['DEVICETYPE'] = 'ovs'
 186                 if bridgeDetails['BOOTPROTO'] == 'dhcp':
 187                     del bridgeDetails['BOOTPROTO']
 188                     bridgeDetails['OVSBOOTPROTO'] = 'dhcp'
 189                     bridgeDetails['OVSDHCPINTERFACES'] = ifname
 190             devices_map[bridgeName] = bridgeDetails
 191         else:
 192             if 'IFNAME' in details:
 193                 ifname = details['IFNAME']
 194                 device_id -= 1
 195             elif orig_ifname:
 196                 ifname = orig_ifname
 197                 device_id -= 1
 198             else:
 199                 while True:
 200                     ifname="eth%d" % (device_id-1)
 201                     if ifname not in devices_map:
 202                         break
 203                     device_id += 1
 204                 if os.path.exists("%s/ifcfg-%s"%(sysconfig,ifname)):
 205                     logger.log("net:InitInterfaces WARNING: possibly blowing away %s configuration"%ifname)
 206             devices_map[ifname] = details
 207         device_id += 1
 208     logger.log('net:InitInterfaces: Device map: %r' % devices_map)
 209     m = modprobe.Modprobe()
 210     try:
 211         m.input("%s/etc/modprobe.conf" % root)
 212     except:
 213         pass
 214     for (dev, details) in devices_map.iteritems():
 215         # get the driver string "moduleName option1=a option2=b"
 216         driver=details.get('DRIVER','')
 217         if driver <> '':
 218             driver=driver.split()
 219             kernelmodule=driver[0]
 220             m.aliasset(dev,kernelmodule)
 221             options=" ".join(driver[1:])
 222             if options <> '':
 223                 m.optionsset(dev,options)
 224     m.output("%s/etc/modprobe.conf" % root, program)
 225
 226     # clean up after any ifcfg-$dev script that's no longer listed as
 227     # part of the Interfaces associated with this node
 228
 229     # list all network-scripts
 230     files = os.listdir(sysconfig)
 231
 232     # filter out the ifcfg-* files
 233     ifcfgs=[]
 234     for f in files:
 235         if f.find("ifcfg-") == 0:
 236             ifcfgs.append(f)
 237
 238     # remove loopback (lo) from ifcfgs list
 239     lo = "ifcfg-lo"
 240     if lo in ifcfgs: ifcfgs.remove(lo)
 241
 242     # remove known devices from ifcfgs list
 243     for (dev, details) in devices_map.iteritems():
 244         ifcfg = 'ifcfg-'+dev
 245         if ifcfg in ifcfgs: ifcfgs.remove(ifcfg)
 246
 247     # delete the remaining ifcfgs from
 248     deletedSomething = False
 249
 250     if not failedToGetSettings:
 251         for ifcfg in ifcfgs:
 252             dev = ifcfg[len('ifcfg-'):]
 253             path = "%s/ifcfg-%s" % (sysconfig,dev)
 254             if not files_only:
 255                 logger.verbose("net:InitInterfaces removing %s %s"%(dev,path))
 256                 os.system("/sbin/ifdown %s" % dev)
 257             deletedSomething=True
 258             os.unlink(path)
 259
 260     # wait a bit for the one or more ifdowns to have taken effect
 261     if deletedSomething:
 262         time.sleep(2)
 263
 264     # Write network configuration file
 265     networkconf = file("%s/etc/sysconfig/network" % root, "w")
 266     networkconf.write("NETWORKING=yes\nHOSTNAME=%s\n" % hostname)
 267     if gateway is not None:
 268         networkconf.write("GATEWAY=%s\n" % gateway)
 269     networkconf.close()
 270
 271     # Process ifcfg-$dev changes / additions
 272     newdevs = []
 273     table = 10
 274     for (dev, details) in devices_map.iteritems():
 275         (fd, tmpnam) = tempfile.mkstemp(dir=sysconfig)
 276         f = os.fdopen(fd, "w")
 277         f.write("# Autogenerated by pyplnet... do not edit!\n")
 278         if 'DRIVER' in details:
 279             f.write("# using %s driver for device %s\n" % (details['DRIVER'],dev))
 280         f.write('DEVICE=%s\n' % dev)
 281
 282         # print the configuration values
 283         for (key, val) in details.iteritems():
 284             if key not in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER','GATEWAY'):
 285                 f.write('%s="%s"\n' % (key, val))
 286
 287         # print the configuration specific option values (if any)
 288         if 'CFGOPTIONS' in details:
 289             cfgoptions = details['CFGOPTIONS']
 290             f.write('#CFGOPTIONS are %s\n' % cfgoptions)
 291             for cfgoption in cfgoptions.split():
 292                 key,val = cfgoption.split('=')
 293                 key=key.strip()
 294                 key=key.upper()
 295                 val=val.strip()
 296                 f.write('%s="%s"\n' % (key,val))
 297         f.close()
 298
 299         # compare whether two files are the same
 300         def comparefiles(a,b):
 301             try:
 302                 logger.verbose("net:InitInterfaces comparing %s with %s" % (a,b))
 303                 if not os.path.exists(a): return False
 304                 fb = open(a)
 305                 buf_a = fb.read()
 306                 fb.close()
 307
 308                 if not os.path.exists(b): return False
 309                 fb = open(b)
 310                 buf_b = fb.read()
 311                 fb.close()
 312
 313                 return buf_a == buf_b
 314             except IOError, e:
 315                 return False
 316
 317         src_route_changed = False
 318         if ('PRIMARY' not in details and 'GATEWAY' in details and
 319             details['GATEWAY'] != ''):
 320             table += 1
 321             (fd, rule_tmpnam) = tempfile.mkstemp(dir=sysconfig)
 322             os.write(fd, "from %s lookup %d\n" % (details['IPADDR'], table))
 323             os.close(fd)
 324             rule_dest = "%s/rule-%s" % (sysconfig, dev)
 325             if not comparefiles(rule_tmpnam, rule_dest):
 326                 os.rename(rule_tmpnam, rule_dest)
 327                 os.chmod(rule_dest, 0644)
 328                 src_route_changed = True
 329             else:
 330                 os.unlink(rule_tmpnam)
 331             (fd, route_tmpnam) = tempfile.mkstemp(dir=sysconfig)
 332             netmask = struct.unpack("I", socket.inet_aton(details['NETMASK']))[0]
 333             ip = struct.unpack("I", socket.inet_aton(details['IPADDR']))[0]
 334             network = socket.inet_ntoa(struct.pack("I", (ip & netmask)))
 335             netmask = socket.ntohl(netmask)
 336             i = 0
 337             while (netmask & (1 << i)) == 0:
 338                 i += 1
 339             prefix = 32 - i
 340             os.write(fd, "%s/%d dev %s table %d\n" % (network, prefix, dev, table))
 341             os.write(fd, "default via %s dev %s table %d\n" % (details['GATEWAY'], dev, table))
 342             os.close(fd)
 343             route_dest = "%s/route-%s" % (sysconfig, dev)
 344             if not comparefiles(route_tmpnam, route_dest):
 345                 os.rename(route_tmpnam, route_dest)
 346                 os.chmod(route_dest, 0644)
 347                 src_route_changed = True
 348             else:
 349                 os.unlink(route_tmpnam)
 350
 351         path = "%s/ifcfg-%s" % (sysconfig,dev)
 352         if not os.path.exists(path):
 353             logger.verbose('net:InitInterfaces adding configuration for %s' % dev)
 354             # add ifcfg-$dev configuration file
 355             os.rename(tmpnam,path)
 356             os.chmod(path,0644)
 357             newdevs.append(dev)
 358
 359         elif not comparefiles(tmpnam,path) or src_route_changed:
 360             logger.verbose('net:InitInterfaces Configuration change for %s' % dev)
 361             if not files_only:
 362                 logger.verbose('net:InitInterfaces ifdown %s' % dev)
 363                 # invoke ifdown for the old configuration
 364                 os.system("/sbin/ifdown %s" % dev)
 365                 # wait a few secs for ifdown to complete
 366                 time.sleep(2)
 367
 368             logger.log('replacing configuration for %s' % dev)
 369             # replace ifcfg-$dev configuration file
 370             os.rename(tmpnam,path)
 371             os.chmod(path,0644)
 372             newdevs.append(dev)
 373         else:
 374             # tmpnam & path are identical
 375             os.unlink(tmpnam)
 376
 377     for dev in newdevs:
 378         cfgvariables = {}
 379         fb = file("%s/ifcfg-%s"%(sysconfig,dev),"r")
 380         for line in fb.readlines():
 381             parts = line.split()
 382             if parts[0][0]=="#":continue
 383             if parts[0].find('='):
 384                 name,value = parts[0].split('=')
 385                 # clean up name & value
 386                 name = name.strip()
 387                 value = value.strip()
 388                 value = value.strip("'")
 389                 value = value.strip('"')
 390                 cfgvariables[name]=value
 391         fb.close()
 392
 393         def getvar(name):
 394             if name in cfgvariables:
 395                 value=cfgvariables[name]
 396                 value = value.lower()
 397                 return value
 398             return ''
 399
 400         # skip over device configs with ONBOOT=no
 401         if getvar("ONBOOT") == 'no': continue
 402
 403         # don't bring up slave devices, the network scripts will
 404         # handle those correctly
 405         if getvar("SLAVE") == 'yes': continue
 406
 407         # Delay bringing up any bridge devices
 408         if dev in bridgeDevices: continue
 409
 410         if not files_only:
 411             logger.verbose('net:InitInterfaces bringing up %s' % dev)
 412             os.system("/sbin/ifup %s" % dev)
 413
 414     # Bring up the bridge devices
 415     for bridge in bridgeDevices:
 416         if not files_only and bridge in newdevs:
 417             logger.verbose('net:InitInterfaces bringing up bridge %s' % bridge)
 418             os.system("/sbin/ifup %s" % bridge)
 419
 420 ##
 421 # Prepare the interface details.
 422 #
 423 def prepDetails(interface, hostname=''):
 424     details = {}
 425     details['ONBOOT']  = 'yes'
 426     details['USERCTL'] = 'no'
 427     if interface['mac']:
 428         details['HWADDR'] = interface['mac']
 429     if interface['is_primary']:
 430         details['PRIMARY'] = 'yes'
 431
 432     if interface['method'] == "static":
 433         details['BOOTPROTO'] = "static"
 434         details['IPADDR']    = interface['ip']
 435         details['NETMASK']   = interface['netmask']
 436         details['GATEWAY']   = interface['gateway']
 437         if interface['is_primary']:
 438             if interface['dns1']:
 439                 details['DNS1'] = interface['dns1']
 440             if interface['dns2']:
 441                 details['DNS2'] = interface['dns2']
 442
 443     elif interface['method'] == "dhcp":
 444         details['BOOTPROTO'] = "dhcp"
 445         details['PERSISTENT_DHCLIENT'] = "yes"
 446         if interface['hostname']:
 447             details['DHCP_HOSTNAME'] = interface['hostname']
 448         else:
 449             details['DHCP_HOSTNAME'] = hostname
 450         if not interface['is_primary']:
 451             details['DHCLIENTARGS'] = "-R subnet-mask"
 452
 453     return details
 454
 455 ##
 456 # Remove duplicate entry from the bridged interface's configuration file.
 457 #
 458 def removeBridgedIfaceDetails(details):
 459     for key in [ 'PRIMARY', 'PERSISTENT_DHCLIENT', 'DHCLIENTARGS', 'DHCP_HOSTNAME',
 460                  'BOOTPROTO', 'IPADDR', 'NETMASK', 'GATEWAY', 'DNS1', 'DNS2' ]:
 461         if key in details:
 462             del details[key]
 463     return details
 464
 465 if __name__ == "__main__":
 466     import optparse
 467     import sys
 468
 469     parser = optparse.OptionParser(usage="plnet [-v] [-f] [-p <program>] -r root node_id")
 470     parser.add_option("-v", "--verbose", action="store_true", dest="verbose")
 471     parser.add_option("-r", "--root", action="store", type="string",
 472                       dest="root", default=None)
 473     parser.add_option("-f", "--files-only", action="store_true",
 474                       dest="files_only")
 475     parser.add_option("-p", "--program", action="store", type="string",
 476                       dest="program", default="plnet")
 477     (options, args) = parser.parse_args()
 478     if len(args) != 1 or options.root is None:
 479         print sys.argv
 480         print >>sys.stderr, "Missing root or node_id"
 481         parser.print_help()
 482         sys.exit(1)
 483
 484     node = shell.GetNodes({'node_id': [int(args[0])]})
 485     try:
 486         interfaces = shell.GetInterfaces({'interface_id': node[0]['interface_ids']})
 487     except AttributeError:
 488         interfaces = shell.GetNodeNetworks({'nodenetwork_id':node[0]['nodenetwork_ids']})
 489         version = 4.2
 490
 491
 492     data = {'hostname': node[0]['hostname'], 'interfaces': interfaces}
 493     class logger:
 494         def __init__(self, verbose):
 495             self.verbosity = verbose
 496         def log(self, msg, loglevel=2):
 497             if self.verbosity:
 498                 print msg
 499         def verbose(self, msg):
 500             self.log(msg, 1)
 501     l = logger(options.verbose)
 502     InitInterfaces(l, shell, data, options.root, options.files_only)