plnet.py

   1 #!/usr/bin/python /usr/bin/plcsh
   2 # $Id$
   3
   4 import os
   5 import socket
   6 import time
   7 import tempfile
   8 import errno
   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 = {}
  81         details['ONBOOT']='yes'
  82         details['USERCTL']='no'
  83         if interface['mac']:
  84             details['HWADDR'] = interface['mac']
  85         if interface['is_primary']:
  86             details['PRIMARY']='yes'
  87
  88         if interface['method'] == "static":
  89             details['BOOTPROTO'] = "static"
  90             details['IPADDR'] = interface['ip']
  91             details['NETMASK'] = interface['netmask']
  92             if interface['is_primary']:
  93                 gateway = interface['gateway']
  94                 if interface['dns1']:
  95                     details['DNS1'] = interface['dns1']
  96                 if interface['dns2']:
  97                     details['DNS2'] = interface['dns2']
  98
  99         elif interface['method'] == "dhcp":
 100             details['BOOTPROTO'] = "dhcp"
 101             details['PERSISTENT_DHCLIENT'] = "yes"
 102             if interface['hostname']:
 103                 details['DHCP_HOSTNAME'] = interface['hostname']
 104             else:
 105                 details['DHCP_HOSTNAME'] = hostname
 106             if not interface['is_primary']:
 107                 details['DHCLIENTARGS'] = "-R subnet-mask"
 108
 109         if 'interface_tag_ids' in interface:
 110             version = 4.3
 111             interface_tag_ids = "interface_tag_ids"
 112             interface_tag_id = "interface_tag_id"
 113             name_key = "tagname"
 114         else:
 115             version = 4.2
 116             interface_tag_ids = "nodenetwork_setting_ids"
 117             interface_tag_id = "nodenetwork_setting_id"
 118             name_key = "name"
 119
 120         if len(interface[interface_tag_ids]) > 0:
 121             try:
 122                 if version == 4.3:
 123                     settings = plc.GetInterfaceTags({interface_tag_id:interface[interface_tag_ids]})
 124                 else:
 125                     settings = plc.GetNodeNetworkSettings({interface_tag_id:interface[interface_tag_ids]})
 126             except:
 127                 logger.log("net:InitInterfaces FATAL: failed call GetInterfaceTags({'interface_tag_id':{%s})"% \
 128                            interface[interface_tag_ids])
 129                 failedToGetSettings = True
 130                 continue # on to the next interface
 131
 132             for setting in settings:
 133                 settingname = setting[name_key].upper()
 134                 if settingname in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER'):
 135                     details[settingname]=setting['value']
 136                 # wireless settings
 137                 elif settingname in \
 138                         [  "MODE", "ESSID", "NW", "FREQ", "CHANNEL", "SENS", "RATE",
 139                            "KEY", "KEY1", "KEY2", "KEY3", "KEY4", "SECURITYMODE",
 140                            "IWCONFIG", "IWPRIV" ] :
 141                     details [settingname] = setting['value']
 142                     details ['TYPE']='Wireless'
 143                 else:
 144                     logger.log("net:InitInterfaces WARNING: ignored setting named %s"%setting[name_key])
 145
 146         # support aliases to interfaces either by name or HWADDR
 147         if 'ALIAS' in details:
 148             if 'HWADDR' in details:
 149                 hwaddr = details['HWADDR'].lower()
 150                 del details['HWADDR']
 151                 if hwaddr in macs:
 152                     hwifname = macs[hwaddr]
 153                     if ('IFNAME' in details) and details['IFNAME'] <> hwifname:
 154                         logger.log("net:InitInterfaces WARNING: alias ifname (%s) and hwaddr ifname (%s) do not match"%\
 155                                        (details['IFNAME'],hwifname))
 156                         details['IFNAME'] = hwifname
 157                 else:
 158                     logger.log('net:InitInterfaces WARNING: mac addr %s for alias not found' %(hwaddr))
 159
 160             if 'IFNAME' in details:
 161                 # stupid RH /etc/sysconfig/network-scripts/ifup-aliases:new_interface()
 162                 # checks if the "$DEVNUM" only consists of '^[0-9A-Za-z_]*$'. Need to make
 163                 # our aliases compliant.
 164                 parts = details['ALIAS'].split('_')
 165                 isValid=True
 166                 for part in parts:
 167                     isValid=isValid and part.isalnum()
 168
 169                 if isValid:
 170                     devices_map["%s:%s" % (details['IFNAME'],details['ALIAS'])] = details
 171                 else:
 172                     logger.log("net:InitInterfaces WARNING: interface alias (%s) not a valid string for RH ifup-aliases"% details['ALIAS'])
 173             else:
 174                 logger.log("net:InitInterfaces WARNING: interface alias (%s) not matched to an interface"% details['ALIAS'])
 175             device_id -= 1
 176         else:
 177             if 'IFNAME' in details:
 178                 ifname = details['IFNAME']
 179                 device_id -= 1
 180             elif orig_ifname:
 181                 ifname = orig_ifname
 182                 device_id -= 1
 183             else:
 184                 while True:
 185                     ifname="eth%d" % (device_id-1)
 186                     if ifname not in devices_map:
 187                         break
 188                     device_id += 1
 189                 if os.path.exists("%s/ifcfg-%s"%(sysconfig,ifname)):
 190                     logger.log("net:InitInterfaces WARNING: possibly blowing away %s configuration"%ifname)
 191             devices_map[ifname] = details
 192         device_id += 1
 193     m = modprobe.Modprobe()
 194     try:
 195         m.input("%s/etc/modprobe.conf" % root)
 196     except:
 197         pass
 198     for (dev, details) in devices_map.iteritems():
 199         # get the driver string "moduleName option1=a option2=b"
 200         driver=details.get('DRIVER','')
 201         if driver <> '':
 202             driver=driver.split()
 203             kernelmodule=driver[0]
 204             m.aliasset(dev,kernelmodule)
 205             options=" ".join(driver[1:])
 206             if options <> '':
 207                 m.optionsset(dev,options)
 208     m.output("%s/etc/modprobe.conf" % root, program)
 209
 210     # clean up after any ifcfg-$dev script that's no longer listed as
 211     # part of the Interfaces associated with this node
 212
 213     # list all network-scripts
 214     files = os.listdir(sysconfig)
 215
 216     # filter out the ifcfg-* files
 217     ifcfgs=[]
 218     for f in files:
 219         if f.find("ifcfg-") == 0:
 220             ifcfgs.append(f)
 221
 222     # remove loopback (lo) from ifcfgs list
 223     lo = "ifcfg-lo"
 224     if lo in ifcfgs: ifcfgs.remove(lo)
 225
 226     # remove known devices from icfgs list
 227     for (dev, details) in devices_map.iteritems():
 228         ifcfg = 'ifcfg-'+dev
 229         if ifcfg in ifcfgs: ifcfgs.remove(ifcfg)
 230
 231     # delete the remaining ifcfgs from
 232     deletedSomething = False
 233
 234     if not failedToGetSettings:
 235         for ifcfg in ifcfgs:
 236             dev = ifcfg[len('ifcfg-'):]
 237             path = "%s/ifcfg-%s" % (sysconfig,dev)
 238             if not files_only:
 239                 logger.verbose("net:InitInterfaces removing %s %s"%(dev,path))
 240                 os.system("/sbin/ifdown %s" % dev)
 241             deletedSomething=True
 242             os.unlink(path)
 243
 244     # wait a bit for the one or more ifdowns to have taken effect
 245     if deletedSomething:
 246         time.sleep(2)
 247
 248     # Write network configuration file
 249     networkconf = file("%s/etc/sysconfig/network" % root, "w")
 250     networkconf.write("NETWORKING=yes\nHOSTNAME=%s\n" % hostname)
 251     if gateway is not None:
 252         networkconf.write("GATEWAY=%s\n" % gateway)
 253     networkconf.close()
 254
 255     # Process ifcfg-$dev changes / additions
 256     newdevs = []
 257     for (dev, details) in devices_map.iteritems():
 258         (fd, tmpnam) = tempfile.mkstemp(dir=sysconfig)
 259         f = os.fdopen(fd, "w")
 260         f.write("# Autogenerated by pyplnet... do not edit!\n")
 261         if 'DRIVER' in details:
 262             f.write("# using %s driver for device %s\n" % (details['DRIVER'],dev))
 263         f.write('DEVICE=%s\n' % dev)
 264
 265         # print the configuration values
 266         for (key, val) in details.iteritems():
 267             if key not in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER'):
 268                 f.write('%s=%s\n' % (key, val))
 269
 270         # print the configuration specific option values (if any)
 271         if 'CFGOPTIONS' in details:
 272             cfgoptions = details['CFGOPTIONS']
 273             f.write('#CFGOPTIONS are %s\n' % cfgoptions)
 274             for cfgoption in cfgoptions.split():
 275                 key,val = cfgoption.split('=')
 276                 key=key.strip()
 277                 key=key.upper()
 278                 val=val.strip()
 279                 f.write('%s="%s"\n' % (key,val))
 280         f.close()
 281
 282         # compare whether two files are the same
 283         def comparefiles(a,b):
 284             try:
 285                 logger.verbose("net:InitInterfaces comparing %s with %s" % (a,b))
 286                 if not os.path.exists(a): return False
 287                 fb = open(a)
 288                 buf_a = fb.read()
 289                 fb.close()
 290
 291                 if not os.path.exists(b): return False
 292                 fb = open(b)
 293                 buf_b = fb.read()
 294                 fb.close()
 295
 296                 return buf_a == buf_b
 297             except IOError, e:
 298                 return False
 299
 300         path = "%s/ifcfg-%s" % (sysconfig,dev)
 301         if not os.path.exists(path):
 302             logger.verbose('net:InitInterfaces adding configuration for %s' % dev)
 303             # add ifcfg-$dev configuration file
 304             os.rename(tmpnam,path)
 305             os.chmod(path,0644)
 306             newdevs.append(dev)
 307
 308         elif not comparefiles(tmpnam,path):
 309             logger.verbose('net:InitInterfaces Configuration change for %s' % dev)
 310             if not files_only:
 311                 logger.verbose('net:InitInterfaces ifdown %s' % dev)
 312                 # invoke ifdown for the old configuration
 313                 os.system("/sbin/ifdown %s" % dev)
 314                 # wait a few secs for ifdown to complete
 315                 time.sleep(2)
 316
 317             logger.log('replacing configuration for %s' % dev)
 318             # replace ifcfg-$dev configuration file
 319             os.rename(tmpnam,path)
 320             os.chmod(path,0644)
 321             newdevs.append(dev)
 322         else:
 323             # tmpnam & path are identical
 324             os.unlink(tmpnam)
 325
 326     for dev in newdevs:
 327         cfgvariables = {}
 328         fb = file("%s/ifcfg-%s"%(sysconfig,dev),"r")
 329         for line in fb.readlines():
 330             parts = line.split()
 331             if parts[0][0]=="#":continue
 332             if parts[0].find('='):
 333                 name,value = parts[0].split('=')
 334                 # clean up name & value
 335                 name = name.strip()
 336                 value = value.strip()
 337                 value = value.strip("'")
 338                 value = value.strip('"')
 339                 cfgvariables[name]=value
 340         fb.close()
 341
 342         def getvar(name):
 343             if name in cfgvariables:
 344                 value=cfgvariables[name]
 345                 value = value.lower()
 346                 return value
 347             return ''
 348
 349         # skip over device configs with ONBOOT=no
 350         if getvar("ONBOOT") == 'no': continue
 351
 352         # don't bring up slave devices, the network scripts will
 353         # handle those correctly
 354         if getvar("SLAVE") == 'yes': continue
 355
 356         if not files_only:
 357             logger.verbose('net:InitInterfaces bringing up %s' % dev)
 358             os.system("/sbin/ifup %s" % dev)
 359
 360 if __name__ == "__main__":
 361     import optparse
 362     import sys
 363
 364     parser = optparse.OptionParser(usage="plnet [-v] [-f] [-p <program>] -r root node_id")
 365     parser.add_option("-v", "--verbose", action="store_true", dest="verbose")
 366     parser.add_option("-r", "--root", action="store", type="string",
 367                       dest="root", default=None)
 368     parser.add_option("-f", "--files-only", action="store_true",
 369                       dest="files_only")
 370     parser.add_option("-p", "--program", action="store", type="string",
 371                       dest="program", default="plnet")
 372     (options, args) = parser.parse_args()
 373     if len(args) != 1 or options.root is None:
 374         print >>sys.stderr, "Missing root or node_id"
 375         parser.print_help()
 376         sys.exit(1)
 377
 378     node = shell.GetNodes({'node_id': [int(args[0])]})
 379     try:
 380         interfaces = shell.GetInterfaces({'interface_id': node[0]['interface_ids']})
 381     except AttributeError:
 382         interfaces = shell.GetNodeNetworks({'nodenetwork_id':node[0]['nodenetwork_ids']})
 383         version = 4.2
 384
 385
 386     data = {'hostname': node[0]['hostname'], 'interfaces': interfaces}
 387     class logger:
 388         def __init__(self, verbose):
 389             self.verbosity = verbose
 390         def log(self, msg, loglevel=2):
 391             if self.verbosity:
 392                 print msg
 393         def verbose(self, msg):
 394             self.log(msg, 1)
 395     l = logger(options.verbose)
 396     InitInterfaces(l, shell, data, options.root, options.files_only)