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     # assume data['networks'] contains this node's NodeNetworks
  34     interfaces = {}
  35     interface = 1
  36     hostname = data.get('hostname',socket.gethostname())
  37     gateway = None
  38     networks = data['networks']
  39     failedToGetSettings = False
  40
  41     # NOTE: GetInterfaces/NodeNetworks does not necessarily order the interfaces
  42     # returned.  Because 'interface'is decremented as each interface is processed,
  43     # by the time is_primary=True (primary) interface is reached, the device
  44     # "eth%s" % interface, is not eth0.  But, something like eth-4, or eth-12.
  45     # This code sorts the interfaces, implicitly placing the primary (first created)
  46     # interface first.  There is a lot of room for improvement to how this
  47     # script handles interfaces and how it chooses the primary interface.
  48     def compare_by (fieldname):
  49         def compare_two_dicts (a, b):
  50             return cmp(a[fieldname], b[fieldname])
  51         return compare_two_dicts
  52     if version == 4.3:
  53         networks.sort( compare_by('interface_id') )
  54     else:
  55         networks.sort( compare_by('nodenetwork_id') )
  56
  57     for network in networks:
  58         logger.verbose('net:InitInterfaces interface %d: %s'%(interface,network))
  59         logger.verbose('net:InitInterfaces macs = %s' % macs)
  60         logger.verbose('net:InitInterfaces ips = %s' % ips)
  61         # Get interface name preferably from MAC address, falling back
  62         # on IP address.
  63         hwaddr=network['mac']
  64         if hwaddr <> None: hwaddr=hwaddr.lower()
  65         if hwaddr in macs:
  66             orig_ifname = macs[hwaddr]
  67         elif network['ip'] in ips:
  68             orig_ifname = ips[network['ip']]
  69         else:
  70             orig_ifname = None
  71
  72         if orig_ifname:
  73                 logger.verbose('net:InitInterfaces orig_ifname = %s' % orig_ifname)
  74
  75         inter = {}
  76         inter['ONBOOT']='yes'
  77         inter['USERCTL']='no'
  78         if network['mac']:
  79             inter['HWADDR'] = network['mac']
  80         if network['is_primary']:
  81             inter['PRIMARY']='yes'
  82
  83         if network['method'] == "static":
  84             inter['BOOTPROTO'] = "static"
  85             inter['IPADDR'] = network['ip']
  86             inter['NETMASK'] = network['netmask']
  87             inter['DNS1'] = network['dns1']
  88             inter['DNS2'] = network['dns2']
  89             if network['is_primary']:
  90                 gateway = network['gateway']
  91
  92         elif network['method'] == "dhcp":
  93             inter['BOOTPROTO'] = "dhcp"
  94             inter['PERSISTENT_DHCLIENT'] = "yes"
  95             if network['hostname']:
  96                 inter['DHCP_HOSTNAME'] = network['hostname']
  97             else:
  98                 inter['DHCP_HOSTNAME'] = hostname
  99             if not network['is_primary']:
 100                 inter['DHCLIENTARGS'] = "-R subnet-mask"
 101
 102         try:
 103             plc.GetInterfaceTags()
 104             version = 4.3
 105         except AttributeError:
 106             version = 4.2
 107
 108         if version == 4.3:
 109             interface_tag_ids = "interface_tag_ids"
 110             interface_tag_id = "interface_tag_id"
 111         else:
 112             interface_tag_ids = "nodenetwork_setting_ids"
 113             interface_tag_id = "nodenetwork_setting_id"
 114
 115         if len(network[interface_tag_ids]) > 0:
 116             try:
 117                 if version == 4.3:
 118                     settings = plc.GetInterfaceTags({interface_tag_id:network[interface_tag_ids]})
 119                 else:
 120                     settings = plc.GetNodeNetworkSettings({interface_tag_id:network[interface_tag_ids]})
 121             except:
 122                 logger.log("net:InitInterfaces FATAL: failed call GetInterfaceTags({'interface_tag_id':{%s})"% \
 123                            network['interface_tag_ids'])
 124                 failedToGetSettings = True
 125                 continue # on to the next network
 126
 127             for setting in settings:
 128                 # to explicitly set interface name
 129                 name_key = "name"
 130                 if version == 4.3:
 131                     name_key = "tagname"
 132
 133                 settingname = setting[name_key].upper()
 134                 if settingname in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER'):
 135                     inter[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                     inter [settingname] = setting['value']
 142                     inter ['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 inter:
 148             if 'HWADDR' in inter:
 149                 hwaddr = inter['HWADDR'].lower()
 150                 del inter['HWADDR']
 151                 if hwaddr in macs:
 152                     hwifname = macs[hwaddr]
 153                     if ('IFNAME' in inter) and inter['IFNAME'] <> hwifname:
 154                         logger.log("net:InitInterfaces WARNING: alias ifname (%s) and hwaddr ifname (%s) do not match"%\
 155                                        (inter['IFNAME'],hwifname))
 156                         inter['IFNAME'] = hwifname
 157                 else:
 158                     logger.log('net:InitInterfaces WARNING: mac addr %s for alias not found' %(hwaddr,alias))
 159
 160             if 'IFNAME' in inter:
 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 = inter['ALIAS'].split('_')
 165                 isValid=True
 166                 for part in parts:
 167                     isValid=isValid and part.isalnum()
 168
 169                 if isValid:
 170                     interfaces["%s:%s" % (inter['IFNAME'],inter['ALIAS'])] = inter
 171                 else:
 172                     logger.log("net:InitInterfaces WARNING: interface alias (%s) not a valid string for RH ifup-aliases"% inter['ALIAS'])
 173             else:
 174                 logger.log("net:InitInterfaces WARNING: interface alias (%s) not matched to an interface"% inter['ALIAS'])
 175             interface -= 1
 176         else:
 177             if ('IFNAME' not in inter) and not orig_ifname:
 178                 ifname="eth%d" % (interface-1)
 179                 # should check if $ifname is an eth already defines
 180                 if os.path.exists("%s/ifcfg-%s"%(sysconfig,ifname)):
 181                     logger.log("net:InitInterfaces WARNING: possibly blowing away %s configuration"%ifname)
 182             else:
 183                 if ('IFNAME' not in inter) and orig_ifname:
 184                     ifname = orig_ifname
 185                 else:
 186                     ifname = inter['IFNAME']
 187                 interface -= 1
 188             interfaces[ifname] = inter
 189
 190     m = modprobe.Modprobe()
 191     try:
 192         m.input("%s/etc/modprobe.conf" % root)
 193     except:
 194         pass
 195     for (dev, inter) in interfaces.iteritems():
 196         # get the driver string "moduleName option1=a option2=b"
 197         driver=inter.get('DRIVER','')
 198         if driver <> '':
 199             driver=driver.split()
 200             kernelmodule=driver[0]
 201             m.aliasset(dev,kernelmodule)
 202             options=" ".join(driver[1:])
 203             if options <> '':
 204                 m.optionsset(dev,options)
 205     m.output("%s/etc/modprobe.conf" % root, program)
 206
 207     # clean up after any ifcfg-$dev script that's no longer listed as
 208     # part of the NodeNetworks associated with this node
 209
 210     # list all network-scripts
 211     files = os.listdir(sysconfig)
 212
 213     # filter out the ifcfg-* files
 214     ifcfgs=[]
 215     for f in files:
 216         if f.find("ifcfg-") == 0:
 217             ifcfgs.append(f)
 218
 219     # remove loopback (lo) from ifcfgs list
 220     lo = "ifcfg-lo"
 221     if lo in ifcfgs: ifcfgs.remove(lo)
 222
 223     # remove known devices from icfgs list
 224     for (dev, inter) in interfaces.iteritems():
 225         ifcfg = 'ifcfg-'+dev
 226         if ifcfg in ifcfgs: ifcfgs.remove(ifcfg)
 227
 228     # delete the remaining ifcfgs from
 229     deletedSomething = False
 230
 231     if not failedToGetSettings:
 232         for ifcfg in ifcfgs:
 233             dev = ifcfg[len('ifcfg-'):]
 234             path = "%s/ifcfg-%s" % (sysconfig,dev)
 235             if not files_only:
 236                 logger.verbose("net:InitInterfaces removing %s %s"%(dev,path))
 237                 os.system("/sbin/ifdown %s" % dev)
 238             deletedSomething=True
 239             os.unlink(path)
 240
 241     # wait a bit for the one or more ifdowns to have taken effect
 242     if deletedSomething:
 243         time.sleep(2)
 244
 245     # Write network configuration file
 246     networkconf = file("%s/etc/sysconfig/network" % root, "w")
 247     networkconf.write("NETWORKING=yes\nHOSTNAME=%s\n" % hostname)
 248     if gateway is not None:
 249         networkconf.write("GATEWAY=%s\n" % gateway)
 250     networkconf.close()
 251
 252     # Process ifcfg-$dev changes / additions
 253     newdevs = []
 254     for (dev, inter) in interfaces.iteritems():
 255         (fd, tmpnam) = tempfile.mkstemp(dir=sysconfig)
 256         f = os.fdopen(fd, "w")
 257         f.write("# Autogenerated by pyplnet... do not edit!\n")
 258         if 'DRIVER' in inter:
 259             f.write("# using %s driver for device %s\n" % (inter['DRIVER'],dev))
 260         f.write('DEVICE=%s\n' % dev)
 261
 262         # print the configuration values
 263         for (key, val) in inter.iteritems():
 264             if key not in ('IFNAME','ALIAS','CFGOPTIONS','DRIVER'):
 265                 f.write('%s=%s\n' % (key, val))
 266
 267         # print the configuration specific option values (if any)
 268         if 'CFGOPTIONS' in inter:
 269             cfgoptions = inter['CFGOPTIONS']
 270             f.write('#CFGOPTIONS are %s\n' % cfgoptions)
 271             for cfgoption in cfgoptions.split():
 272                 key,val = cfgoption.split('=')
 273                 key=key.strip()
 274                 key=key.upper()
 275                 val=val.strip()
 276                 f.write('%s="%s"\n' % (key,val))
 277         f.close()
 278
 279         # compare whether two files are the same
 280         def comparefiles(a,b):
 281             try:
 282                 logger.verbose("net:InitInterfaces comparing %s with %s" % (a,b))
 283                 if not os.path.exists(a): return False
 284                 fb = open(a)
 285                 buf_a = fb.read()
 286                 fb.close()
 287
 288                 if not os.path.exists(b): return False
 289                 fb = open(b)
 290                 buf_b = fb.read()
 291                 fb.close()
 292
 293                 return buf_a == buf_b
 294             except IOError, e:
 295                 return False
 296
 297         path = "%s/ifcfg-%s" % (sysconfig,dev)
 298         if not os.path.exists(path):
 299             logger.verbose('net:InitInterfaces adding configuration for %s' % dev)
 300             # add ifcfg-$dev configuration file
 301             os.rename(tmpnam,path)
 302             os.chmod(path,0644)
 303             newdevs.append(dev)
 304
 305         elif not comparefiles(tmpnam,path):
 306             logger.verbose('net:InitInterfaces Configuration change for %s' % dev)
 307             if not files_only:
 308                 logger.verbose('net:InitInterfaces ifdown %s' % dev)
 309                 # invoke ifdown for the old configuration
 310                 os.system("/sbin/ifdown %s" % dev)
 311                 # wait a few secs for ifdown to complete
 312                 time.sleep(2)
 313
 314             logger.log('replacing configuration for %s' % dev)
 315             # replace ifcfg-$dev configuration file
 316             os.rename(tmpnam,path)
 317             os.chmod(path,0644)
 318             newdevs.append(dev)
 319         else:
 320             # tmpnam & path are identical
 321             os.unlink(tmpnam)
 322
 323     for dev in newdevs:
 324         cfgvariables = {}
 325         fb = file("%s/ifcfg-%s"%(sysconfig,dev),"r")
 326         for line in fb.readlines():
 327             parts = line.split()
 328             if parts[0][0]=="#":continue
 329             if parts[0].find('='):
 330                 name,value = parts[0].split('=')
 331                 # clean up name & value
 332                 name = name.strip()
 333                 value = value.strip()
 334                 value = value.strip("'")
 335                 value = value.strip('"')
 336                 cfgvariables[name]=value
 337         fb.close()
 338
 339         def getvar(name):
 340             if name in cfgvariables:
 341                 value=cfgvariables[name]
 342                 value = value.lower()
 343                 return value
 344             return ''
 345
 346         # skip over device configs with ONBOOT=no
 347         if getvar("ONBOOT") == 'no': continue
 348
 349         # don't bring up slave devices, the network scripts will
 350         # handle those correctly
 351         if getvar("SLAVE") == 'yes': continue
 352
 353         if not files_only:
 354             logger.verbose('net:InitInterfaces bringing up %s' % dev)
 355             os.system("/sbin/ifup %s" % dev)
 356
 357 if __name__ == "__main__":
 358     import optparse
 359     import sys
 360
 361     parser = optparse.OptionParser(usage="plnet [-v] [-f] [-p <program>] -r root node_id")
 362     parser.add_option("-v", "--verbose", action="store_true", dest="verbose")
 363     parser.add_option("-r", "--root", action="store", type="string",
 364                       dest="root", default=None)
 365     parser.add_option("-f", "--files-only", action="store_true",
 366                       dest="files_only")
 367     parser.add_option("-p", "--program", action="store", type="string",
 368                       dest="program", default="plnet")
 369     (options, args) = parser.parse_args()
 370     if len(args) != 1 or options.root is None:
 371         print >>sys.stderr, "Missing root or node_id"
 372         parser.print_help()
 373         sys.exit(1)
 374
 375     node = shell.GetNodes({'node_id': [int(args[0])]})
 376     try:
 377         networks = shell.GetInterfaces({'interface_id': node[0]['interface_ids']})
 378     except AttributeError:
 379         networks = shell.GetNodeNetworks({'nodenetwork_id':node[0]['nodenetwork_ids']})
 380         version = 4.2
 381
 382
 383     data = {'hostname': node[0]['hostname'], 'networks': networks}
 384     class logger:
 385         def __init__(self, verbose):
 386             self.verbosity = verbose
 387         def log(self, msg, loglevel=2):
 388             if self.verbosity:
 389                 print msg
 390         def verbose(self, msg):
 391             self.log(msg, 1)
 392     l = logger(options.verbose)
 393     InitInterfaces(l, shell, data, options.root, options.files_only)