--- /dev/null
+#!/usr/bin/python
+#
+# Copyright (c) 2003 Intel Corporation
+# All rights reserved.
+#
+# Copyright (c) 2004-2006 The Trustees of Princeton University
+# All rights reserved.
+
+
+import xmlrpclib
+import xml.parsers.expat
+import hmac
+import string
+import sha
+import cPickle
+import utils
+import os
+
+from Exceptions import *
+
+stash = None
+
+def create_auth_structure( vars, call_params ):
+ """
+ create and return an authentication structure for a Boot API
+ call. Vars contains the boot manager runtime variables, and
+ call_params is a tuple of the parameters that will be passed to the
+ API call. Return None if unable to (typically due to missing
+ keys in vars, such as node_id or node_key)
+ """
+
+ auth= {}
+
+ try:
+ auth_session = {}
+ auth_session['AuthMethod'] = 'session'
+
+ if not vars.has_key('NODE_SESSION'):
+ # Try to load /etc/planetlab/session if it exists.
+ sessionfile = open('/etc/planetlab/session', 'r')
+ session = sessionfile.read().strip()
+
+ auth_session['session'] = session
+ # Test session. Faults if it's no good.
+ vars['API_SERVER_INST'].AuthCheck(auth_session)
+ vars['NODE_SESSION'] = session
+
+ sessionfile.close()
+ else:
+ auth_session['session'] = vars['NODE_SESSION']
+
+ auth = auth_session
+
+ except:
+ auth['AuthMethod']= 'hmac'
+
+ try:
+ auth['node_id'] = vars['NODE_ID']
+ auth['node_ip'] = vars['INTERFACE_SETTINGS']['ip']
+ except KeyError, e:
+ return None
+
+ node_hmac= hmac.new(vars['NODE_KEY'], "[]".encode('utf-8'), sha).hexdigest()
+ auth['value']= node_hmac
+ try:
+ auth_session = {}
+ if not vars.has_key('NODE_SESSION'):
+ session = vars['API_SERVER_INST'].GetSession(auth)
+ auth_session['session'] = session
+ vars['NODE_SESSION'] = session
+ # NOTE: save session value to /etc/planetlab/session for
+ # RunlevelAgent and future BootManager runs
+ if not os.path.exists("/etc/planetlab"):
+ os.makedirs("/etc/planetlab")
+ sessionfile = open('/etc/planetlab/session', 'w')
+ sessionfile.write( vars['NODE_SESSION'] )
+ sessionfile.close()
+ else:
+ auth_session['session'] = vars['NODE_SESSION']
+
+ auth_session['AuthMethod'] = 'session'
+ auth = auth_session
+
+ except Exception, e:
+ # NOTE: BM has failed to authenticate utterly.
+ raise BootManagerAuthenticationException, "%s" % e
+
+ return auth
+
+
+def serialize_params( call_params ):
+ """
+ convert a list of parameters into a format that will be used in the
+ hmac generation. both the boot manager and plc must have a common
+ format. full documentation is in the boot manager technical document,
+ but essentially we are going to take all the values (and keys for
+ dictionary objects), and put them into a list. sort them, and combine
+ them into one long string encased in a set of braces.
+ """
+
+ values= []
+
+ for param in call_params:
+ if isinstance(param,list) or isinstance(param,tuple):
+ values += serialize_params(param)
+ elif isinstance(param,dict):
+ values += serialize_params(param.values())
+ elif isinstance(param,xmlrpclib.Boolean):
+ # bool was not a real type in Python <2.3 and had to be
+ # marshalled as a custom type in xmlrpclib. Make sure that
+ # bools serialize consistently.
+ if param:
+ values.append("True")
+ else:
+ values.append("False")
+ else:
+ values.append(unicode(param))
+
+ return values
+
+
+def call_api_function( vars, function, user_params ):
+ """
+ call the named api function with params, and return the
+ value to the caller. the authentication structure is handled
+ automatically, and doesn't need to be passed in with params.
+
+ If the call fails, a BootManagerException is raised.
+ """
+ global stash
+
+ try:
+ api_server= vars['API_SERVER_INST']
+ except KeyError, e:
+ raise BootManagerException, "No connection to the API server exists."
+
+ if api_server is None:
+ if not stash:
+ load(vars)
+ for i in stash:
+ if i[0] == function and i[1] == user_params:
+ return i[2]
+ raise BootManagerException, \
+ "Disconnected operation failed, insufficient stash."
+
+ auth= create_auth_structure(vars,user_params)
+ if auth is None:
+ raise BootManagerException, \
+ "Could not create auth structure, missing values."
+
+ params= (auth,)
+ params= params + user_params
+
+ try:
+ exec( "rc= api_server.%s(*params)" % function )
+ if stash is None:
+ stash = []
+ stash += [ [ function, user_params, rc ] ]
+ return rc
+ except xmlrpclib.Fault, fault:
+ raise BootManagerException, "API Fault: %s" % fault
+ except xmlrpclib.ProtocolError, err:
+ raise BootManagerException,"XML RPC protocol error: %s" % err
+ except xml.parsers.expat.ExpatError, err:
+ raise BootManagerException,"XML parsing error: %s" % err
+
+
+class Stash(file):
+ mntpnt = '/tmp/stash'
+ def __init__(self, vars, mode):
+ utils.makedirs(self.mntpnt)
+ try:
+ utils.sysexec('mount -t auto -U %s %s' % (vars['DISCONNECTED_OPERATION'], self.mntpnt))
+ # make sure it's not read-only
+ f = file('%s/api.cache' % self.mntpnt, 'a')
+ f.close()
+ file.__init__(self, '%s/api.cache' % self.mntpnt, mode)
+ except:
+ utils.sysexec_noerr('umount %s' % self.mntpnt)
+ raise BootManagerException, "Couldn't find API-cache for disconnected operation"
+
+ def close(self):
+ file.close(self)
+ utils.sysexec_noerr('umount %s' % self.mntpnt)
+
+def load(vars):
+ global stash
+ s = Stash(vars, 'r')
+ stash = cPickle.load(s)
+ s.close()
+
+def save(vars):
+ global stash
+ if vars['DISCONNECTED_OPERATION']:
+ s = Stash(vars, 'w')
+ cPickle.dump(stash, s)
+ s.close()
git://git.onelab.eu / bootmanager.git / blobdiff