source4/scripting/bin/samba_kcc

   1 #!/usr/bin/env python
   2 #
   3 # Compute our KCC topology
   4 #
   5 # Copyright (C) Dave Craft 2011
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 import os
  21 import sys
  22 import random
  23
  24 # ensure we get messages out immediately, so they get in the samba logs,
  25 # and don't get swallowed by a timeout
  26 os.environ['PYTHONUNBUFFERED'] = '1'
  27
  28 # forcing GMT avoids a problem in some timezones with kerberos. Both MIT
  29 # heimdal can get mutual authentication errors due to the 24 second difference
  30 # between UTC and GMT when using some zone files (eg. the PDT zone from
  31 # the US)
  32 os.environ["TZ"] = "GMT"
  33
  34 # Find right directory when running from source tree
  35 sys.path.insert(0, "bin/python")
  36
  37 import samba, ldb
  38 import optparse
  39 import logging
  40
  41 from samba           import getopt as options
  42 from samba.auth      import system_session
  43 from samba.samdb     import SamDB
  44 from samba.kcc_utils import *
  45
  46 class KCC:
  47     """The Knowledge Consistency Checker class.  A container for
  48        objects and methods allowing a run of the KCC.  Produces
  49        a set of connections in the samdb for which the Distributed
  50        Replication Service can then utilize to replicate naming
  51        contexts
  52     """
  53     def __init__(self, samdb):
  54         """Initializes the partitions class which can hold
  55            our local DCs partitions or all the partitions in
  56            the forest
  57         """
  58         self.dsa_table     = {}    # dsa objects
  59         self.part_table    = {}    # partition objects
  60         self.site_table    = {}
  61         self.my_dsa_dnstr  = None  # My dsa DN
  62         self.my_site_dnstr = None
  63         self.samdb         = samdb
  64
  65     def load_my_site(self):
  66         """Loads the Site class for the local DSA
  67            Raises an Exception on error
  68         """
  69         self.my_site_dnstr = "CN=%s,CN=Sites,%s" % (samdb.server_site_name(),
  70                              samdb.get_config_basedn())
  71         site = Site(self.my_site_dnstr)
  72
  73         site.load_site(samdb)
  74         self.site_table[self.my_site_dnstr] = site
  75
  76     def load_my_dsa(self):
  77         """Discover my nTDSDSA thru the rootDSE entry and
  78            instantiate and load the DSA.  The dsa is inserted
  79            into the dsa_table by dn string
  80            Raises an Exception on error.
  81         """
  82         dn = ldb.Dn(self.samdb, "")
  83         try:
  84             res = samdb.search(base=dn, scope=ldb.SCOPE_BASE,
  85                                attrs=["dsServiceName"])
  86         except ldb.LdbError, (enum, estr):
  87             raise Exception("Unable to find my nTDSDSA - (%s)" % estr)
  88
  89         dnstr = res[0]["dsServiceName"][0]
  90
  91         # already loaded
  92         if dnstr in self.dsa_table.keys():
  93             return
  94
  95         self.my_dsa_dnstr = dnstr
  96         dsa = DirectoryServiceAgent(dnstr)
  97
  98         dsa.load_dsa(samdb)
  99
 100         # Assign this dsa to my dsa table
 101         # and index by dsa dn
 102         self.dsa_table[dnstr] = dsa
 103
 104     def load_all_dsa(self):
 105         """Discover all nTDSDSA thru the sites entry and
 106            instantiate and load the DSAs.  Each dsa is inserted
 107            into the dsa_table by dn string.
 108            Raises an Exception on error.
 109         """
 110         try:
 111             res = self.samdb.search("CN=Sites,%s" %
 112                                     self.samdb.get_config_basedn(),
 113                                     scope=ldb.SCOPE_SUBTREE,
 114                                     expression="(objectClass=nTDSDSA)")
 115         except ldb.LdbError, (enum, estr):
 116             raise Exception("Unable to find nTDSDSAs - (%s)" % estr)
 117
 118         for msg in res:
 119             dnstr = str(msg.dn)
 120
 121             # already loaded
 122             if dnstr in self.dsa_table.keys():
 123                 continue
 124
 125             dsa = DirectoryServiceAgent(dnstr)
 126
 127             dsa.load_dsa(self.samdb)
 128
 129             # Assign this dsa to my dsa table
 130             # and index by dsa dn
 131             self.dsa_table[dnstr] = dsa
 132
 133     def load_all_partitions(self):
 134         """Discover all NCs thru the Partitions dn and
 135            instantiate and load the NCs.  Each NC is inserted
 136            into the part_table by partition dn string (not
 137            the nCName dn string)
 138            Raises an Exception on error
 139         """
 140         try:
 141             res = self.samdb.search("CN=Partitions,%s" %
 142                                     self.samdb.get_config_basedn(),
 143                                     scope=ldb.SCOPE_SUBTREE,
 144                                     expression="(objectClass=crossRef)")
 145         except ldb.LdbError, (enum, estr):
 146             raise Exception("Unable to find partitions - (%s)" % estr)
 147
 148         for msg in res:
 149             partstr = str(msg.dn)
 150
 151             # already loaded
 152             if partstr in self.part_table.keys():
 153                 continue
 154
 155             part = Partition(partstr)
 156
 157             part.load_partition(self.samdb)
 158             self.part_table[partstr] = part
 159
 160     def should_be_present_test(self):
 161         """Enumerate all loaded partitions and DSAs and test
 162            if NC should be present as replica
 163         """
 164         for partdn, part in self.part_table.items():
 165
 166            for dsadn, dsa in self.dsa_table.items():
 167                needed, ro, partial = part.should_be_present(dsa)
 168
 169                logger.info("dsadn:%s\nncdn:%s\nneeded=%s:ro=%s:partial=%s\n" % \
 170                            (dsa.dsa_dnstr, part.nc_dnstr, needed, ro, partial))
 171
 172     def refresh_failed_links_connections(self):
 173         # XXX - not implemented yet
 174         return
 175
 176     def is_stale_link_connection(self, target_dsa):
 177         """Returns False if no tuple z exists in the kCCFailedLinks or
 178            kCCFailedConnections variables such that z.UUIDDsa is the
 179            objectGUID of the target dsa, z.FailureCount > 0, and
 180            the current time - z.TimeFirstFailure > 2 hours.
 181         """
 182         # XXX - not implemented yet
 183         return False
 184
 185     def remove_unneeded_failed_links_connections(self):
 186         # XXX - not implemented yet
 187         return
 188
 189     def remove_unneeded_ntds_connections(self):
 190         # XXX - not implemented yet
 191         return
 192
 193     def translate_connections(self):
 194         # XXX - not implemented yet
 195         return
 196
 197     def intersite(self):
 198         """The head method for generating the inter-site KCC replica
 199            connection graph and attendant nTDSConnection objects
 200            in the samdb
 201         """
 202         # XXX - not implemented yet
 203
 204     def update_rodc_connection(self):
 205         """Runs when the local DC is an RODC and updates the RODC NTFRS
 206            connection object.
 207         """
 208         # Given an nTDSConnection object cn1, such that cn1.options contains
 209         # NTDSCONN_OPT_RODC_TOPOLOGY, and another nTDSConnection object cn2,
 210         # does not contain NTDSCONN_OPT_RODC_TOPOLOGY, modify cn1 to ensure
 211         # that the following is true:
 212         #
 213         #     cn1.fromServer = cn2.fromServer
 214         #     cn1.schedule   = cn2.schedule
 215         #
 216         # If no such cn2 can be found, cn1 is not modified.
 217         # If no such cn1 can be found, nothing is modified by this task.
 218
 219         # XXX - not implemented yet
 220
 221     def intrasite_max_node_edges(self, node_count):
 222         """Returns the maximum number of edges directed to a node in
 223            the intrasite replica graph.  The KCC does not create more
 224            than 50 edges directed to a single DC. To optimize replication,
 225            we compute that each node should have n+2 total edges directed
 226            to it such that (n) is the smallest non-negative integer
 227            satisfying (node_count <= 2*(n*n) + 6*n + 7)
 228            :param node_count: total number of nodes in the replica graph
 229         """
 230         n = 0
 231         while True:
 232             if node_count <= (2 * (n * n) + (6 * n) + 7):
 233                 break
 234             n = n + 1
 235         n = n + 2
 236         if n < 50:
 237             return n
 238         return 50
 239
 240     def construct_intrasite_graph(self, site_local, dc_local,
 241                                   nc_x, gc_only, detect_stale):
 242
 243         # We're using the MS notation names here to allow
 244         # correlation back to the published algorithm.
 245         #
 246         # nc_x     - naming context (x) that we are testing if it
 247         #            "should be present" on the local DC
 248         # f_of_x   - replica (f) found on a DC (s) for NC (x)
 249         # dc_s     - DC where f_of_x replica was found
 250         # dc_local - local DC that potentially needs a replica
 251         #            (f_of_x)
 252         # r_list   - replica list R
 253         # p_of_x   - replica (p) is partial and found on a DC (s)
 254         #            for NC (x)
 255         # l_of_x   - replica (l) is the local replica for NC (x)
 256         #            that should appear on the local DC
 257         # r_len    = is length of replica list |R|
 258         #
 259         # If the DSA doesn't need a replica for this
 260         # partition (NC x) then continue
 261         needed, ro, partial = nc_x.should_be_present(dc_local)
 262
 263         logger.debug("construct_intrasite_graph:\n" + \
 264                      "nc_x: %s\ndc_local: %s\n" % \
 265                      (nc_x, dc_local) + \
 266                      "gc_only: %s\nneeded: %s\nro: %s\npartial: %s" % \
 267                      (gc_only, needed, ro, partial))
 268
 269         if needed == False:
 270             return
 271
 272         # Create a NCReplica that matches what the local replica
 273         # should say.  We'll use this below in our r_list
 274         l_of_x = NCReplica(dc_local.dsa_dnstr, dc_local.dsa_guid, \
 275                            nc_x.nc_dnstr, nc_x.nc_guid, nc_x.nc_sid)
 276
 277         l_of_x.identify_by_basedn(self.samdb)
 278
 279         l_of_x.rep_partial  = partial
 280         l_of_x.rep_ro       = ro
 281
 282         # Empty replica sequence list
 283         r_list = []
 284
 285         # We'll loop thru all the DSAs looking for
 286         # writeable NC replicas that match the naming
 287         # context dn for (nc_x)
 288         #
 289         for dc_s_dn, dc_s in self.dsa_table.items():
 290
 291             # If this partition (nc_x) doesn't appear as a
 292             # replica (f_of_x) on (dc_s) then continue
 293             if not nc_x.nc_dnstr in dc_s.rep_table.keys():
 294                 continue
 295
 296             # Pull out the NCReplica (f) of (x) with the dn
 297             # that matches NC (x) we are examining.
 298             f_of_x = dc_s.rep_table[nc_x.nc_dnstr]
 299
 300             # Replica (f) of NC (x) must be writable
 301             if f_of_x.is_ro() == True:
 302                 continue
 303
 304             # Replica (f) of NC (x) must satisfy the
 305             # "is present" criteria for DC (s) that
 306             # it was found on
 307             if f_of_x.is_present() == False:
 308                 continue
 309
 310             # DC (s) must be a writable DSA other than
 311             # my local DC.  In other words we'd only replicate
 312             # from other writable DC
 313             if dc_s.is_ro() or dc_s is dc_local:
 314                 continue
 315
 316             # Certain replica graphs are produced only
 317             # for global catalogs, so test against
 318             # method input parameter
 319             if gc_only and dc_s.is_gc() == False:
 320                 continue
 321
 322             # DC (s) must be in the same site as the local DC
 323             # This is the intra-site algorithm.  We are not
 324             # replicating across multiple sites
 325             if site_local.is_same_site(dc_s) == False:
 326                 continue
 327
 328             # If NC (x) is intended to be read-only full replica
 329             # for a domain NC on the target DC then the source
 330             # DC should have functional level at minimum WIN2008
 331             #
 332             # Effectively we're saying that in order to replicate
 333             # to a targeted RODC (which was introduced in Windows 2008)
 334             # then we have to replicate from a DC that is also minimally
 335             # at that level.
 336             #
 337             # You can also see this requirement in the MS special
 338             # considerations for RODC which state that to deploy
 339             # an RODC, at least one writable domain controller in
 340             # the domain must be running Windows Server 2008
 341             if ro and partial == False and nc_x.nc_type == NCType.domain:
 342                 if dc_s.is_minimum_behavior(DS_BEHAVIOR_WIN2008) == False:
 343                     continue
 344
 345             # If we haven't been told to turn off stale connection
 346             # detection and this dsa has a stale connection then
 347             # continue
 348             if detect_stale and self.is_stale_link_connection(dc_s) == True:
 349                continue
 350
 351             # Replica meets criteria.  Add it to table indexed
 352             # by the GUID of the DC that it appears on
 353             r_list.append(f_of_x)
 354
 355         # If a partial (not full) replica of NC (x) "should be present"
 356         # on the local DC, append to R each partial replica (p of x)
 357         # such that p "is present" on a DC satisfying the same
 358         # criteria defined above for full replica DCs.
 359         if partial == True:
 360
 361             # Now we loop thru all the DSAs looking for
 362             # partial NC replicas that match the naming
 363             # context dn for (NC x)
 364             for dc_s_dn, dc_s in self.dsa_table.items():
 365
 366                 # If this partition NC (x) doesn't appear as a
 367                 # replica (p) of NC (x) on the dsa DC (s) then
 368                 # continue
 369                 if not nc_x.nc_dnstr in dc_s.rep_table.keys():
 370                     continue
 371
 372                 # Pull out the NCReplica with the dn that
 373                 # matches NC (x) we are examining.
 374                 p_of_x = dsa.rep_table[nc_x.nc_dnstr]
 375
 376                 # Replica (p) of NC (x) must be partial
 377                 if p_of_x.is_partial() == False:
 378                     continue
 379
 380                 # Replica (p) of NC (x) must satisfy the
 381                 # "is present" criteria for DC (s) that
 382                 # it was found on
 383                 if p_of_x.is_present() == False:
 384                     continue
 385
 386                 # DC (s) must be a writable DSA other than
 387                 # my DSA.  In other words we'd only replicate
 388                 # from other writable DSA
 389                 if dc_s.is_ro() or dc_s is dc_local:
 390                     continue
 391
 392                 # Certain replica graphs are produced only
 393                 # for global catalogs, so test against
 394                 # method input parameter
 395                 if gc_only and dc_s.is_gc() == False:
 396                     continue
 397
 398                 # DC (s) must be in the same site as the local DC
 399                 # This is the intra-site algorithm.  We are not
 400                 # replicating across multiple sites
 401                 if site_local.is_same_site(dc_s) == False:
 402                     continue
 403
 404                 # This criteria is moot (a no-op) for this case
 405                 # because we are scanning for (partial = True).  The
 406                 # MS algorithm statement says partial replica scans
 407                 # should adhere to the "same" criteria as full replica
 408                 # scans so the criteria doesn't change here...its just
 409                 # rendered pointless.
 410                 #
 411                 # The case that is occurring would be a partial domain
 412                 # replica is needed on a local DC global catalog.  There
 413                 # is no minimum windows behavior for those since GCs
 414                 # have always been present.
 415                 if ro and partial == False and nc_x.nc_type == NCType.domain:
 416                     if dc_s.is_minimum_behavior(DS_BEHAVIOR_WIN2008) == False:
 417                         continue
 418
 419                 # If we haven't been told to turn off stale connection
 420                 # detection and this dsa has a stale connection then
 421                 # continue
 422                 if detect_stale and self.is_stale_link_connection(dc_s) == True:
 423                     continue
 424
 425                 # Replica meets criteria.  Add it to table indexed
 426                 # by the GUID of the DSA that it appears on
 427                 r_list.append(p_of_x)
 428
 429         # Append to R the NC replica that "should be present"
 430         # on the local DC
 431         r_list.append(l_of_x)
 432
 433         r_list.sort(sort_replica_by_dsa_guid)
 434
 435         r_len = len(r_list)
 436
 437         max_node_edges = self.intrasite_max_node_edges(r_len)
 438
 439         # Add a node for each r_list element to the replica graph
 440         graph_list = []
 441         for rep in r_list:
 442             node = GraphNode(rep.rep_dsa_dnstr, max_node_edges)
 443             graph_list.append(node)
 444
 445         # For each r(i) from (0 <= i < |R|-1)
 446         i = 0
 447         while i < (r_len-1):
 448             # Add an edge from r(i) to r(i+1) if r(i) is a full
 449             # replica or r(i+1) is a partial replica
 450             if r_list[i].is_partial() == False or \
 451                r_list[i+1].is_partial() == True:
 452                 graph_list[i+1].add_edge_from(r_list[i].rep_dsa_dnstr)
 453
 454             # Add an edge from r(i+1) to r(i) if r(i+1) is a full
 455             # replica or ri is a partial replica.
 456             if r_list[i+1].is_partial() == False or \
 457                r_list[i].is_partial() == True:
 458                 graph_list[i].add_edge_from(r_list[i+1].rep_dsa_dnstr)
 459             i = i + 1
 460
 461         # Add an edge from r|R|-1 to r0 if r|R|-1 is a full replica
 462         # or r0 is a partial replica.
 463         if r_list[r_len-1].is_partial() == False or \
 464            r_list[0].is_partial() == True:
 465             graph_list[0].add_edge_from(r_list[r_len-1].rep_dsa_dnstr)
 466
 467         # Add an edge from r0 to r|R|-1 if r0 is a full replica or
 468         # r|R|-1 is a partial replica.
 469         if r_list[0].is_partial() == False or \
 470            r_list[r_len-1].is_partial() == True:
 471             graph_list[r_len-1].add_edge_from(r_list[0].rep_dsa_dnstr)
 472
 473         # For each existing nTDSConnection object implying an edge
 474         # from rj of R to ri such that j != i, an edge from rj to ri
 475         # is not already in the graph, and the total edges directed
 476         # to ri is less than n+2, the KCC adds that edge to the graph.
 477         i = 0
 478         while i < r_len:
 479             dsa = self.dsa_table[graph_list[i].dsa_dnstr]
 480             graph_list[i].add_edges_from_connections(dsa)
 481             i = i + 1
 482
 483         i = 0
 484         while i < r_len:
 485             tnode  = graph_list[i]
 486
 487             # To optimize replication latency in sites with many NC replicas, the
 488             # KCC adds new edges directed to ri to bring the total edges to n+2,
 489             # where the NC replica rk of R from which the edge is directed
 490             # is chosen at random such that k != i and an edge from rk to ri
 491             # is not already in the graph.
 492             #
 493             # Note that the KCC tech ref does not give a number for the definition
 494             # of "sites with many NC replicas".   At a bare minimum to satisfy
 495             # n+2 edges directed at a node we have to have at least three replicas
 496             # in |R| (i.e. if n is zero then at least replicas from two other graph
 497             # nodes may direct edges to us).
 498             if r_len >= 3:
 499                 # pick a random index
 500                 findex = rindex = random.randint(0, r_len-1)
 501
 502                 # while this node doesn't have sufficient edges
 503                 while tnode.has_sufficient_edges() == False:
 504                     # If this edge can be successfully added (i.e. not
 505                     # the same node and edge doesn't already exist) then
 506                     # select a new random index for the next round
 507                     if tnode.add_edge_from(graph_list[rindex].dsa_dnstr) == True:
 508                         findex = rindex = random.randint(0, r_len-1)
 509                     else:
 510                         # Otherwise continue looking against each node
 511                         # after the random selection
 512                         rindex = rindex + 1
 513                         if rindex >= r_len:
 514                             rindex = 0
 515
 516                         if rindex == findex:
 517                             logger.error("Unable to satisfy max edge criteria!")
 518                             break
 519
 520             # Print the graph node in debug mode
 521             logger.debug("%s" % tnode)
 522
 523             # For each edge directed to the local DC, ensure a nTDSConnection
 524             # points to us that satisfies the KCC criteria
 525             if graph_list[i].dsa_dnstr == dc_local.dsa_dnstr:
 526                 graph_list[i].add_connections_from_edges(dc_local)
 527
 528             i = i + 1
 529
 530     def intrasite(self):
 531         """The head method for generating the intra-site KCC replica
 532            connection graph and attendant nTDSConnection objects
 533            in the samdb
 534         """
 535         # Retrieve my DSA
 536         mydsa = self.dsa_table[self.my_dsa_dnstr]
 537
 538         logger.debug("intrasite enter:\nmydsa: %s" % mydsa)
 539
 540         # Test whether local site has topology disabled
 541         mysite = self.site_table[self.my_site_dnstr]
 542         if mysite.is_intrasite_topology_disabled():
 543             return
 544
 545         detect_stale = mysite.should_detect_stale()
 546
 547         # Loop thru all the partitions.
 548         for partdn, part in self.part_table.items():
 549             self.construct_intrasite_graph(mysite, mydsa, part,  \
 550                                            False, \
 551                                            detect_stale)
 552
 553         # If the DC is a GC server, the KCC constructs an additional NC
 554         # replica graph (and creates nTDSConnection objects) for the
 555         # config NC as above, except that only NC replicas that "are present"
 556         # on GC servers are added to R.
 557         for partdn, part in self.part_table.items():
 558             if part.is_config():
 559                 self.construct_intrasite_graph(mysite, mydsa, part,  \
 560                                                True, \
 561                                                detect_stale)
 562
 563         # The DC repeats the NC replica graph computation and nTDSConnection
 564         # creation for each of the NC replica graphs, this time assuming
 565         # that no DC has failed. It does so by re-executing the steps as
 566         # if the bit NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED were
 567         # set in the options attribute of the site settings object for
 568         # the local DC's site.  (ie. we set "detec_stale" flag to False)
 569
 570         # Loop thru all the partitions.
 571         for partdn, part in self.part_table.items():
 572             self.construct_intrasite_graph(mysite, mydsa, part,  \
 573                                            False, \
 574                                            False) # don't detect stale
 575
 576         # If the DC is a GC server, the KCC constructs an additional NC
 577         # replica graph (and creates nTDSConnection objects) for the
 578         # config NC as above, except that only NC replicas that "are present"
 579         # on GC servers are added to R.
 580         for partdn, part in self.part_table.items():
 581             if part.is_config():
 582                 self.construct_intrasite_graph(mysite, mydsa, part,  \
 583                                                True, \
 584                                                False)  # don't detect stale
 585
 586         # Commit any newly created connections to the samdb
 587         mydsa.commit_connection_table(self.samdb)
 588
 589         logger.debug("intrasite exit:\nmydsa: %s" % mydsa)
 590
 591     def run(self):
 592         """Method to perform a complete run of the KCC and
 593            produce an updated topology for subsequent NC replica
 594            syncronization between domain controllers
 595         """
 596         # Setup
 597         try:
 598             self.load_my_dsa()
 599             self.load_all_dsa()
 600             self.load_all_partitions()
 601             self.load_my_site()
 602
 603         except Exception, estr:
 604             logger.error("%s" % estr)
 605             return
 606
 607         # self.should_be_present_test()
 608
 609         # These are the published steps (in order) for the
 610         # MS description of the KCC algorithm
 611
 612         # Step 1
 613         self.refresh_failed_links_connections()
 614
 615         # Step 2
 616         self.intrasite()
 617
 618         # Step 3
 619         self.intersite()
 620
 621         # Step 4
 622         self.remove_unneeded_ntds_connections()
 623
 624         # Step 5
 625         self.translate_connections()
 626
 627         # Step 6
 628         self.remove_unneeded_failed_links_connections()
 629
 630         # Step 7
 631         self.update_rodc_connection()
 632
 633
 634 ##################################################
 635 # Global Functions
 636 ##################################################
 637 def sort_replica_by_dsa_guid(rep1, rep2):
 638     return cmp(rep1.rep_dsa_guid, rep2.rep_dsa_guid)
 639
 640 ##################################################
 641 # samba_kcc entry point
 642 ##################################################
 643
 644 parser    = optparse.OptionParser("samba_kcc [options]")
 645 sambaopts = options.SambaOptions(parser)
 646 credopts  = options.CredentialsOptions(parser)
 647
 648 parser.add_option_group(sambaopts)
 649 parser.add_option_group(credopts)
 650 parser.add_option_group(options.VersionOptions(parser))
 651
 652 parser.add_option("--debug", help="debug output", action="store_true")
 653 parser.add_option("--seed",  help="random number seed")
 654
 655 logger = logging.getLogger("samba_kcc")
 656 logger.addHandler(logging.StreamHandler(sys.stdout))
 657
 658 lp     = sambaopts.get_loadparm()
 659 creds  = credopts.get_credentials(lp, fallback_machine=True)
 660
 661 opts, args = parser.parse_args()
 662
 663 if opts.debug:
 664     logger.setLevel(logging.DEBUG)
 665 else:
 666     logger.setLevel(logging.WARNING)
 667
 668 # initialize seed from optional input parameter
 669 if opts.seed:
 670     random.seed(int(opts.seed))
 671 else:
 672     random.seed(0xACE5CA11)
 673
 674 private_dir = lp.get("private dir")
 675 samdb_path  = os.path.join(private_dir, "samdb.ldb")
 676
 677 try:
 678     samdb = SamDB(url=lp.samdb_url(), session_info=system_session(),
 679                   credentials=creds, lp=lp)
 680 except ldb.LdbError, (num, msg):
 681     logger.info("Unable to open sam database %s : %s" % (lp.samdb_url(), msg))
 682     sys.exit(1)
 683
 684 # Instantiate Knowledge Consistency Checker and perform run
 685 kcc = KCC(samdb)
 686 kcc.run()