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