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