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 import re
  10
  11 import sioc
  12 import modprobe
  13
  14 global version
  15 version = 4.3
  16
  17 def ovs_check(logger):
  18     """ Return True if openvswitch is running, False otherwise. Try restarting
  19         it once.
  20     """
  21     rc = os.system("service openvswitch status")
  22     if rc == 0:
  23         return True
  24     logger.log("net: restarting openvswitch")
  25     rc = os.system("service openvswitch restart")
  26     rc = os.system("service openvswitch status")
  27     if rc == 0:
  28         return True
  29     logger.log("net: failed to restart openvswitch")
  30     return False
  31
  32 def InitInterfaces(logger, plc, data, root="", files_only=False, program="NodeManager"):
  33     global version
  34
  35     sysconfig = "%s/etc/sysconfig/network-scripts" % root
  36     try:
  37         os.makedirs(sysconfig)
  38     except OSError, e:
  39         if e.errno != errno.EEXIST:
  40             raise e
  41
  42     # query running network interfaces
  43     devs = sioc.gifconf()
  44     ips = dict(zip(devs.values(), devs.keys()))
  45     macs = {}
  46     for dev in devs:
  47         macs[sioc.gifhwaddr(dev).lower()] = dev
  48
  49     devices_map = {}
  50     device_id = 1
  51     hostname = data.get('hostname',socket.gethostname())
  52     gateway = None
  53     # assume data['interfaces'] contains this node's Interfaces
  54     # can cope with 4.3 ('networks') or 5.0 ('interfaces')
  55     try:
  56         interfaces = data['interfaces']
  57     except:
  58         interfaces = data['networks']
  59     failedToGetSettings = False
  60
  61     # NOTE: GetInterfaces/NodeNetworks does not necessarily order the interfaces
  62     # returned.  Because 'interface' is decremented as each interface is processed,
  63     # by the time is_primary=True (primary) interface is reached, the device
  64     # "eth%s" % interface, is not eth0.  But, something like eth-4, or eth-12.
  65     # This code sorts the interfaces, placing is_primary=True interfaces first.
  66     # There is a lot of room for improvement to how this
  67     # script handles interfaces and how it chooses the primary interface.
  68     def compare_by (fieldname):
  69         def compare_two_dicts (a, b):
  70             return cmp(a[fieldname], b[fieldname])
  71         return compare_two_dicts
  72
  73     # NOTE: by sorting on 'is_primary' and then reversing (since False is sorted
  74     # before True) all 'is_primary' interfaces are at the beginning of the list.
  75     interfaces.sort( compare_by('is_primary') )
  76     interfaces.reverse()
  77
  78     # The names of the bridge devices
  79     bridgeDevices = []
  80
  81     for interface in interfaces:
  82         logger.verbose('net:InitInterfaces interface %d: %r'%(device_id,interface))
  83         logger.verbose('net:InitInterfaces macs = %r' % macs)
  84         logger.verbose('net:InitInterfaces ips = %r' % ips)
  85         # Get interface name preferably from MAC address, falling back
  86         # on IP address.
  87         hwaddr=interface['mac']
  88         if hwaddr <> None: hwaddr=hwaddr.lower()
  89         if hwaddr in macs:
  90             orig_ifname = macs[hwaddr]
  91         elif interface['ip'] in ips:
  92             orig_ifname = ips[interface['ip']]
  93         else:
  94             orig_ifname = None
  95
  96         if orig_ifname:
  97             logger.verbose('net:InitInterfaces orig_ifname = %s' % orig_ifname)
  98
  99         details = prepDetails(interface, hostname)
 100
 101         if interface['is_primary']:
 102             gateway = interface['gateway']
 103
 104         if 'interface_tag_ids' in interface:
 105             version = 4.3
 106             interface_tag_ids = "interface_tag_ids"
 107             interface_tag_id = "interface_tag_id"
 108             name_key = "tagname"
 109         else:
 110             version = 4.2
 111             interface_tag_ids = "nodenetwork_setting_ids"
 112             interface_tag_id = "nodenetwork_setting_id"
 113             name_key = "name"
 114
 115         if len(interface[interface_tag_ids]) > 0:
 116             try:
 117                 if version == 4.3:
 118                     settings = plc.GetInterfaceTags({interface_tag_id:interface[interface_tag_ids]})
 119                 else:
 120                     settings = plc.GetNodeNetworkSettings({interface_tag_id:interface[interface_tag_ids]})
 121             except:
 122                 logger.log("net:InitInterfaces FATAL: failed call GetInterfaceTags({'interface_tag_id':{%s})"% \
 123                            interface[interface_tag_ids])
 124                 failedToGetSettings = True
 125                 continue # on to the next interface
 126
 127             for setting in settings:
 128                 settingname = setting[name_key].upper()
 129                 if ((settingname in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER','VLAN','TYPE','DEVICETYPE')) or \
 130                     (re.search('^IPADDR[0-9]+$|^NETMASK[0-9]+$', settingname))):
 131                     # TD: Added match for secondary IPv4 configuration.
 132                     details[settingname]=setting['value']
 133                 # IPv6 support on IPv4 interface
 134                 elif settingname in ('IPV6ADDR','IPV6_DEFAULTGW','IPV6ADDR_SECONDARIES', 'IPV6_AUTOCONF'):
 135                     # TD: Added IPV6_AUTOCONF.
 136                     details[settingname]=setting['value']
 137                     details['IPV6INIT']='yes'
 138                 # wireless settings
 139                 elif settingname in \
 140                         [  "MODE", "ESSID", "NW", "FREQ", "CHANNEL", "SENS", "RATE",
 141                            "KEY", "KEY1", "KEY2", "KEY3", "KEY4", "SECURITYMODE",
 142                            "IWCONFIG", "IWPRIV" ] :
 143                     details [settingname] = setting['value']
 144                     details ['TYPE']='Wireless'
 145                 # Bridge setting
 146                 elif settingname in [ 'BRIDGE' ]:
 147                     details['BRIDGE'] = setting['value']
 148                 elif settingname in [ 'OVS_BRIDGE' ]:
 149                     # If openvswitch isn't running, then we'll lose network
 150                     # connectivity when we reconfigure eth0.
 151                     if ovs_check(logger):
 152                         details['OVS_BRIDGE'] = setting['value']
 153                         details['TYPE'] = "OVSPort"
 154                         details['DEVICETYPE'] = "ovs"
 155                     else:
 156                         logger.log("net:InitInterfaces ERROR: OVS_BRIDGE specified, yet ovs is not running")
 157                 else:
 158                     logger.log("net:InitInterfaces WARNING: ignored setting named %s"%setting[name_key])
 159
 160         # support aliases to interfaces either by name or HWADDR
 161         if 'ALIAS' in details:
 162             if 'HWADDR' in details:
 163                 hwaddr = details['HWADDR'].lower()
 164                 del details['HWADDR']
 165                 if hwaddr in macs:
 166                     hwifname = macs[hwaddr]
 167                     if ('IFNAME' in details) and details['IFNAME'] <> hwifname:
 168                         logger.log("net:InitInterfaces WARNING: alias ifname (%s) and hwaddr ifname (%s) do not match"%\
 169                                        (details['IFNAME'],hwifname))
 170                         details['IFNAME'] = hwifname
 171                 else:
 172                     logger.log('net:InitInterfaces WARNING: mac addr %s for alias not found' %(hwaddr))
 173
 174             if 'IFNAME' in details:
 175                 # stupid RH /etc/sysconfig/network-scripts/ifup-aliases:new_interface()
 176                 # checks if the "$DEVNUM" only consists of '^[0-9A-Za-z_]*$'. Need to make
 177                 # our aliases compliant.
 178                 parts = details['ALIAS'].split('_')
 179                 isValid=True
 180                 for part in parts:
 181                     isValid=isValid and part.isalnum()
 182
 183                 if isValid:
 184                     devices_map["%s:%s" % (details['IFNAME'],details['ALIAS'])] = details
 185                 else:
 186                     logger.log("net:InitInterfaces WARNING: interface alias (%s) not a valid string for RH ifup-aliases"% details['ALIAS'])
 187             else:
 188                 logger.log("net:InitInterfaces WARNING: interface alias (%s) not matched to an interface"% details['ALIAS'])
 189             device_id -= 1
 190         elif ('BRIDGE' in details or 'OVS_BRIDGE' in details) and 'IFNAME' in details:
 191             # The bridge inherits the mac of the first attached interface.
 192             ifname = details['IFNAME']
 193             device_id -= 1
 194             if 'BRIDGE' in details:
 195                 bridgeName = details['BRIDGE']
 196                 bridgeType = 'Bridge'
 197             else:
 198                 bridgeName = details['OVS_BRIDGE']
 199                 bridgeType = 'OVSBridge'
 200
 201             logger.log('net:InitInterfaces: %s detected. Adding %s to devices_map' % (bridgeType, ifname))
 202             devices_map[ifname] = removeBridgedIfaceDetails(details)
 203
 204             logger.log('net:InitInterfaces: Adding %s %s' % (bridgeType, bridgeName))
 205             bridgeDetails = prepDetails(interface)
 206
 207             # TD: Add configuration for secondary IPv4 and IPv6 addresses to the bridge.
 208             if len(interface[interface_tag_ids]) > 0:
 209                 try:
 210                     if version == 4.3:
 211                         settings = plc.GetInterfaceTags({interface_tag_id:interface[interface_tag_ids]})
 212                     else:
 213                         settings = plc.GetNodeNetworkSettings({interface_tag_id:interface[interface_tag_ids]})
 214                 except:
 215                     logger.log("net:InitInterfaces FATAL: failed call GetInterfaceTags({'interface_tag_id':{%s})"% \
 216                                interface[interface_tag_ids])
 217                     failedToGetSettings = True
 218                     continue # on to the next interface
 219
 220                 for setting in settings:
 221                     settingname = setting[name_key].upper()
 222                     if (re.search('^IPADDR[0-9]+$|^NETMASK[0-9]+$', settingname)):
 223                         # TD: Added match for secondary IPv4 configuration.
 224                         bridgeDetails[settingname]=setting['value']
 225                     # IPv6 support on IPv4 interface
 226                     elif settingname in ('IPV6ADDR','IPV6_DEFAULTGW','IPV6ADDR_SECONDARIES', 'IPV6_AUTOCONF'):
 227                         # TD: Added IPV6_AUTOCONF.
 228                         bridgeDetails[settingname]=setting['value']
 229                         bridgeDetails['IPV6INIT']='yes'
 230
 231             bridgeDevices.append(bridgeName)
 232             bridgeDetails['TYPE'] = bridgeType
 233             if bridgeType == 'OVSBridge':
 234                 bridgeDetails['DEVICETYPE'] = 'ovs'
 235                 if bridgeDetails['BOOTPROTO'] == 'dhcp':
 236                     del bridgeDetails['BOOTPROTO']
 237                     bridgeDetails['OVSBOOTPROTO'] = 'dhcp'
 238                     bridgeDetails['OVSDHCPINTERFACES'] = ifname
 239             devices_map[bridgeName] = bridgeDetails
 240         else:
 241             if 'IFNAME' in details:
 242                 ifname = details['IFNAME']
 243                 device_id -= 1
 244             elif orig_ifname:
 245                 ifname = orig_ifname
 246                 device_id -= 1
 247             else:
 248                 while True:
 249                     ifname="eth%d" % (device_id-1)
 250                     if ifname not in devices_map:
 251                         break
 252                     device_id += 1
 253                 if os.path.exists("%s/ifcfg-%s"%(sysconfig,ifname)):
 254                     logger.log("net:InitInterfaces WARNING: possibly blowing away %s configuration"%ifname)
 255             devices_map[ifname] = details
 256         device_id += 1
 257     logger.log('net:InitInterfaces: Device map: %r' % devices_map)
 258     m = modprobe.Modprobe()
 259     try:
 260         m.input("%s/etc/modprobe.conf" % root)
 261     except:
 262         pass
 263     for (dev, details) in devices_map.iteritems():
 264         # get the driver string "moduleName option1=a option2=b"
 265         driver=details.get('DRIVER','')
 266         if driver <> '':
 267             driver=driver.split()
 268             kernelmodule=driver[0]
 269             m.aliasset(dev,kernelmodule)
 270             options=" ".join(driver[1:])
 271             if options <> '':
 272                 m.optionsset(dev,options)
 273     m.output("%s/etc/modprobe.conf" % root, program)
 274
 275     # clean up after any ifcfg-$dev script that's no longer listed as
 276     # part of the Interfaces associated with this node
 277
 278     # list all network-scripts
 279     files = os.listdir(sysconfig)
 280
 281     # filter out the ifcfg-* files
 282     ifcfgs=[]
 283     for f in files:
 284         if f.find("ifcfg-") == 0:
 285             ifcfgs.append(f)
 286
 287     # remove loopback (lo) from ifcfgs list
 288     lo = "ifcfg-lo"
 289     if lo in ifcfgs: ifcfgs.remove(lo)
 290
 291     # remove known devices from ifcfgs list
 292     for (dev, details) in devices_map.iteritems():
 293         ifcfg = 'ifcfg-'+dev
 294         if ifcfg in ifcfgs: ifcfgs.remove(ifcfg)
 295
 296     # delete the remaining ifcfgs from
 297     deletedSomething = False
 298
 299     if not failedToGetSettings:
 300         for ifcfg in ifcfgs:
 301             dev = ifcfg[len('ifcfg-'):]
 302             path = "%s/ifcfg-%s" % (sysconfig,dev)
 303             if not files_only:
 304                 logger.verbose("net:InitInterfaces removing %s %s"%(dev,path))
 305                 os.system("/sbin/ifdown %s" % dev)
 306             deletedSomething=True
 307             os.unlink(path)
 308
 309     # wait a bit for the one or more ifdowns to have taken effect
 310     if deletedSomething:
 311         time.sleep(2)
 312
 313     # Write network configuration file
 314     networkconf = file("%s/etc/sysconfig/network" % root, "w")
 315     networkconf.write("NETWORKING=yes\nHOSTNAME=%s\n" % hostname)
 316     if gateway is not None:
 317         networkconf.write("GATEWAY=%s\n" % gateway)
 318     networkconf.close()
 319
 320     # Process ifcfg-$dev changes / additions
 321     newdevs = []
 322     table = 10
 323     for (dev, details) in devices_map.iteritems():
 324         (fd, tmpnam) = tempfile.mkstemp(dir=sysconfig)
 325         f = os.fdopen(fd, "w")
 326         f.write("# Autogenerated by pyplnet... do not edit!\n")
 327         if 'DRIVER' in details:
 328             f.write("# using %s driver for device %s\n" % (details['DRIVER'],dev))
 329         f.write('DEVICE=%s\n' % dev)
 330
 331         # print the configuration values
 332         for (key, val) in details.iteritems():
 333             if key not in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER','GATEWAY'):
 334                 f.write('%s="%s"\n' % (key, val))
 335
 336         # print the configuration specific option values (if any)
 337         if 'CFGOPTIONS' in details:
 338             cfgoptions = details['CFGOPTIONS']
 339             f.write('#CFGOPTIONS are %s\n' % cfgoptions)
 340             for cfgoption in cfgoptions.split():
 341                 key,val = cfgoption.split('=')
 342                 key=key.strip()
 343                 key=key.upper()
 344                 val=val.strip()
 345                 f.write('%s="%s"\n' % (key,val))
 346         f.close()
 347
 348         # compare whether two files are the same
 349         def comparefiles(a,b):
 350             try:
 351                 logger.verbose("net:InitInterfaces comparing %s with %s" % (a,b))
 352                 if not os.path.exists(a): return False
 353                 fb = open(a)
 354                 buf_a = fb.read()
 355                 fb.close()
 356
 357                 if not os.path.exists(b): return False
 358                 fb = open(b)
 359                 buf_b = fb.read()
 360                 fb.close()
 361
 362                 return buf_a == buf_b
 363             except IOError, e:
 364                 return False
 365
 366         src_route_changed = False
 367         if ('PRIMARY' not in details and 'GATEWAY' in details and
 368             details['GATEWAY'] != ''):
 369             table += 1
 370             (fd, rule_tmpnam) = tempfile.mkstemp(dir=sysconfig)
 371             os.write(fd, "from %s lookup %d\n" % (details['IPADDR'], table))
 372             os.close(fd)
 373             rule_dest = "%s/rule-%s" % (sysconfig, dev)
 374             if not comparefiles(rule_tmpnam, rule_dest):
 375                 os.rename(rule_tmpnam, rule_dest)
 376                 os.chmod(rule_dest, 0644)
 377                 src_route_changed = True
 378             else:
 379                 os.unlink(rule_tmpnam)
 380             (fd, route_tmpnam) = tempfile.mkstemp(dir=sysconfig)
 381             netmask = struct.unpack("I", socket.inet_aton(details['NETMASK']))[0]
 382             ip = struct.unpack("I", socket.inet_aton(details['IPADDR']))[0]
 383             network = socket.inet_ntoa(struct.pack("I", (ip & netmask)))
 384             netmask = socket.ntohl(netmask)
 385             i = 0
 386             while (netmask & (1 << i)) == 0:
 387                 i += 1
 388             prefix = 32 - i
 389             os.write(fd, "%s/%d dev %s table %d\n" % (network, prefix, dev, table))
 390             os.write(fd, "default via %s dev %s table %d\n" % (details['GATEWAY'], dev, table))
 391             os.close(fd)
 392             route_dest = "%s/route-%s" % (sysconfig, dev)
 393             if not comparefiles(route_tmpnam, route_dest):
 394                 os.rename(route_tmpnam, route_dest)
 395                 os.chmod(route_dest, 0644)
 396                 src_route_changed = True
 397             else:
 398                 os.unlink(route_tmpnam)
 399
 400         path = "%s/ifcfg-%s" % (sysconfig,dev)
 401         if not os.path.exists(path):
 402             logger.verbose('net:InitInterfaces adding configuration for %s' % dev)
 403             # add ifcfg-$dev configuration file
 404             os.rename(tmpnam,path)
 405             os.chmod(path,0644)
 406             newdevs.append(dev)
 407
 408         elif not comparefiles(tmpnam,path) or src_route_changed:
 409             logger.verbose('net:InitInterfaces Configuration change for %s' % dev)
 410             if not files_only:
 411                 logger.verbose('net:InitInterfaces ifdown %s' % dev)
 412                 # invoke ifdown for the old configuration
 413                 os.system("/sbin/ifdown %s" % dev)
 414                 # wait a few secs for ifdown to complete
 415                 time.sleep(2)
 416
 417             logger.log('replacing configuration for %s' % dev)
 418             # replace ifcfg-$dev configuration file
 419             os.rename(tmpnam,path)
 420             os.chmod(path,0644)
 421             newdevs.append(dev)
 422         else:
 423             # tmpnam & path are identical
 424             os.unlink(tmpnam)
 425
 426     for dev in newdevs:
 427         cfgvariables = {}
 428         fb = file("%s/ifcfg-%s"%(sysconfig,dev),"r")
 429         for line in fb.readlines():
 430             parts = line.split()
 431             if parts[0][0]=="#":continue
 432             if parts[0].find('='):
 433                 name,value = parts[0].split('=')
 434                 # clean up name & value
 435                 name = name.strip()
 436                 value = value.strip()
 437                 value = value.strip("'")
 438                 value = value.strip('"')
 439                 cfgvariables[name]=value
 440         fb.close()
 441
 442         def getvar(name):
 443             if name in cfgvariables:
 444                 value=cfgvariables[name]
 445                 value = value.lower()
 446                 return value
 447             return ''
 448
 449         # skip over device configs with ONBOOT=no
 450         if getvar("ONBOOT") == 'no': continue
 451
 452         # don't bring up slave devices, the network scripts will
 453         # handle those correctly
 454         if getvar("SLAVE") == 'yes': continue
 455
 456         # Delay bringing up any bridge devices
 457         if dev in bridgeDevices: continue
 458
 459         if not files_only:
 460             logger.verbose('net:InitInterfaces bringing up %s' % dev)
 461             os.system("/sbin/ifup %s" % dev)
 462
 463     # Bring up the bridge devices
 464     for bridge in bridgeDevices:
 465         if not files_only and bridge in newdevs:
 466             logger.verbose('net:InitInterfaces bringing up bridge %s' % bridge)
 467             os.system("/sbin/ifup %s" % bridge)
 468
 469 ##
 470 # Prepare the interface details.
 471 #
 472 def prepDetails(interface, hostname=''):
 473     details = {}
 474     details['ONBOOT']  = 'yes'
 475     details['USERCTL'] = 'no'
 476     if interface['mac']:
 477         details['HWADDR'] = interface['mac']
 478     if interface['is_primary']:
 479         details['PRIMARY'] = 'yes'
 480
 481     if interface['method'] == "static":
 482         details['BOOTPROTO'] = "static"
 483         details['IPADDR']    = interface['ip']
 484         details['NETMASK']   = interface['netmask']
 485         details['GATEWAY']   = interface['gateway']
 486         if interface['is_primary']:
 487             if interface['dns1']:
 488                 details['DNS1'] = interface['dns1']
 489             if interface['dns2']:
 490                 details['DNS2'] = interface['dns2']
 491
 492     elif interface['method'] == "dhcp":
 493         details['BOOTPROTO'] = "dhcp"
 494         details['PERSISTENT_DHCLIENT'] = "yes"
 495         if interface['hostname']:
 496             details['DHCP_HOSTNAME'] = interface['hostname']
 497         else:
 498             details['DHCP_HOSTNAME'] = hostname
 499         if not interface['is_primary']:
 500             details['DHCLIENTARGS'] = "-R subnet-mask"
 501
 502     return details
 503
 504 ##
 505 # Remove duplicate entry from the bridged interface's configuration file.
 506 #
 507 def removeBridgedIfaceDetails(details):
 508     # TD: Also added secondary IPv4 keys and IPv6 keys to the keys to be removed.
 509     allKeys = [ 'PRIMARY', 'PERSISTENT_DHCLIENT', 'DHCLIENTARGS', 'DHCP_HOSTNAME',
 510                 'BOOTPROTO', 'IPADDR', 'NETMASK', 'GATEWAY', 'DNS1', 'DNS2',
 511                 'IPV6ADDR', 'IPV6_DEFAULTGW', 'IPV6ADDR_SECONDARIES',
 512                 'IPV6_AUTOCONF', 'IPV6INIT' ]
 513     for i in range(1, 256):
 514        allKeys.append('IPADDR' + str(i))
 515        allKeys.append('NETMASK' + str(i))
 516
 517     for key in allKeys:
 518         if key in details:
 519             del details[key]
 520
 521     # TD: Also turn off IPv6
 522     details['IPV6INIT']      = 'no'
 523     details['IPV6_AUTOCONF'] = 'no'
 524
 525     return details
 526
 527 if __name__ == "__main__":
 528     import optparse
 529     import sys
 530
 531     parser = optparse.OptionParser(usage="plnet [-v] [-f] [-p <program>] -r root node_id")
 532     parser.add_option("-v", "--verbose", action="store_true", dest="verbose")
 533     parser.add_option("-r", "--root", action="store", type="string",
 534                       dest="root", default=None)
 535     parser.add_option("-f", "--files-only", action="store_true",
 536                       dest="files_only")
 537     parser.add_option("-p", "--program", action="store", type="string",
 538                       dest="program", default="plnet")
 539     (options, args) = parser.parse_args()
 540     if len(args) != 1 or options.root is None:
 541         print sys.argv
 542         print >>sys.stderr, "Missing root or node_id"
 543         parser.print_help()
 544         sys.exit(1)
 545
 546     node = shell.GetNodes({'node_id': [int(args[0])]})
 547     try:
 548         interfaces = shell.GetInterfaces({'interface_id': node[0]['interface_ids']})
 549     except AttributeError:
 550         interfaces = shell.GetNodeNetworks({'nodenetwork_id':node[0]['nodenetwork_ids']})
 551         version = 4.2
 552
 553
 554     data = {'hostname': node[0]['hostname'], 'interfaces': interfaces}
 555     class logger:
 556         def __init__(self, verbose):
 557             self.verbosity = verbose
 558         def log(self, msg, loglevel=2):
 559             if self.verbosity:
 560                 print msg
 561         def verbose(self, msg):
 562             self.log(msg, 1)
 563     l = logger(options.verbose)
 564     InitInterfaces(l, shell, data, options.root, options.files_only)