xenserver/etc_xapi.d_plugins_vswitch-cfg-update

   1 #!/usr/bin/env python
   2 #
   3 # xapi plugin script to update the cache of configuration items in the
   4 # ovs-vswitchd configuration file that are managed in the xapi database
   5 # when integrated with Citrix management tools.
   6
   7 # Copyright (C) 2009 Nicira Networks, Inc.
   8 #
   9 # Licensed under the Apache License, Version 2.0 (the "License");
  10 # you may not use this file except in compliance with the License.
  11 # You may obtain a copy of the License at:
  12 #
  13 #     http://www.apache.org/licenses/LICENSE-2.0
  14 #
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS,
  17 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18 # See the License for the specific language governing permissions and
  19 # limitations under the License.
  20
  21 # TBD: - error handling needs to be improved.  Currently this can leave
  22 # TBD:   the system in a bad state if anything goes wrong.
  23
  24 import XenAPIPlugin
  25 import XenAPI
  26 import os
  27 import subprocess
  28
  29 cfg_mod="/usr/bin/ovs-cfg-mod"
  30 vswitchd_cfg_filename="/etc/ovs-vswitchd.conf"
  31 cacert_filename="/etc/ovs-vswitchd.cacert"
  32
  33 # Delete the CA certificate, so that we go back to boot-strapping mode
  34 def delete_cacert():
  35     try:
  36         os.remove(cacert_filename)
  37     except OSError:
  38         # Ignore error if file doesn't exist
  39         pass
  40
  41 def update(session, args):
  42     pools = session.xenapi.pool.get_all()
  43     # We assume there is only ever one pool...
  44     if len(pools) == 0:
  45         raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
  46     if len(pools) > 1:
  47         raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
  48     pool = session.xenapi.pool.get_record(pools[0])
  49     try:
  50         controller = pool["other_config"]["vSwitchController"]
  51     except KeyError, e:
  52         controller = ""
  53     currentController = vswitchCurrentController()
  54     if controller == "" and currentController != "":
  55         delete_cacert()
  56         removeControllerCfg()
  57         return "Successfully removed controller config"
  58     elif controller != currentController:
  59         delete_cacert()
  60         setControllerCfg(controller)
  61         return "Successfully set controller to " + controller
  62     else:
  63         return "No change to configuration"
  64
  65 def vswitchCurrentController():
  66     controller = vswitchCfgQuery("mgmt.controller")
  67     if controller == "":
  68         return controller
  69     if len(controller) < 4 or controller[0:4] != "ssl:":
  70         return controller
  71     else:
  72         return controller[4:]
  73
  74 def removeControllerCfg():
  75     vswitchCfgMod(["--del-match", "mgmt.controller=*",
  76                    "--del-match", "ssl.bootstrap-ca-cert=*",
  77                    "--del-match", "ssl.ca-cert=*",
  78                    "--del-match", "ssl.private-key=*",
  79                    "--del-match", "ssl.certificate=*"])
  80
  81 def setControllerCfg(controller):
  82     vswitchCfgMod(["--del-match", "mgmt.controller=*",
  83                    "--del-match", "ssl.bootstrap-ca-cert=*",
  84                    "--del-match", "ssl.ca-cert=*",
  85                    "--del-match", "ssl.private-key=*",
  86                    "--del-match", "ssl.certificate=*",
  87                    "-a", "mgmt.controller=ssl:" + controller,
  88                    "-a", "ssl.bootstrap-ca-cert=true",
  89                    "-a", "ssl.ca-cert=/etc/ovs-vswitchd.cacert",
  90                    "-a", "ssl.private-key=/etc/xensource/xapi-ssl.pem",
  91                    "-a", "ssl.certificate=/etc/xensource/xapi-ssl.pem"])
  92
  93 def vswitchCfgQuery(key):
  94     cmd = [cfg_mod, "--config-file=" + vswitchd_cfg_filename, "-q", key]
  95     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
  96     if len(output) == 0 or output[0] == None:
  97         output = ""
  98     else:
  99         output = output[0].strip()
 100     return output
 101
 102 def vswitchCfgMod(action_args):
 103     cmd = [cfg_mod, "-vANY:console:emer",
 104            "--config-file=" + vswitchd_cfg_filename] + action_args
 105     exitcode = subprocess.call(cmd)
 106     if exitcode != 0:
 107         raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
 108                                    [ str(exitcode) , str(action_args) ])
 109     vswitchReload()
 110
 111 def vswitchReload():
 112     exitcode = subprocess.call(["/sbin/service", "vswitch", "reload"])
 113     if exitcode != 0:
 114         raise XenAPIPlugin.Failure("VSWITCH_CFG_RELOAD_FAILURE", [ str(exitcode) ])
 115
 116
 117 if __name__ == "__main__":
 118     XenAPIPlugin.dispatch({"update": update})