3 # Compute our KCC topology
5 # Copyright (C) Dave Craft 2011
6 # Copyright (C) Andrew Bartlett 2015
8 # Andrew Bartlett's alleged work performed by his underlings Douglas
9 # Bagnall and Garming Sam.
11 # This program is free software; you can redistribute it and/or modify
12 # it under the terms of the GNU General Public License as published by
13 # the Free Software Foundation; either version 3 of the License, or
14 # (at your option) any later version.
16 # This program is distributed in the hope that it will be useful,
17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 # GNU General Public License for more details.
21 # You should have received a copy of the GNU General Public License
22 # along with this program. If not, see <http://www.gnu.org/licenses/>.
29 # ensure we get messages out immediately, so they get in the samba logs,
30 # and don't get swallowed by a timeout
31 os.environ['PYTHONUNBUFFERED'] = '1'
33 # forcing GMT avoids a problem in some timezones with kerberos. Both MIT
34 # heimdal can get mutual authentication errors due to the 24 second difference
35 # between UTC and GMT when using some zone files (eg. the PDT zone from
37 os.environ["TZ"] = "GMT"
39 # Find right directory when running from source tree
40 sys.path.insert(0, "bin/python")
47 from functools import partial
55 from samba.auth import system_session
56 from samba.samdb import SamDB
57 from samba.dcerpc import drsuapi
58 from samba.kcc_utils import *
59 from samba.graph_utils import *
60 from samba import ldif_utils
64 """The Knowledge Consistency Checker class.
66 A container for objects and methods allowing a run of the KCC. Produces a
67 set of connections in the samdb for which the Distributed Replication
68 Service can then utilize to replicate naming contexts
70 :param unix_now: The putative current time in seconds since 1970.
71 :param read_only: Don't write to the database.
72 :param verify: Check topological invariants for the generated graphs
73 :param debug: Write verbosely to stderr.
74 "param dot_files: write Graphviz files in /tmp showing topology
77 """Initializes the partitions class which can hold
78 our local DCs partitions or all the partitions in
81 self.part_table = {} # partition objects
83 self.transport_table = {}
84 self.ip_transport = None
85 self.sitelink_table = {}
86 self.dsa_by_dnstr = {}
89 self.get_dsa_by_guidstr = self.dsa_by_guid.get
90 self.get_dsa = self.dsa_by_dnstr.get
92 # TODO: These should be backed by a 'permanent' store so that when
93 # calling DRSGetReplInfo with DS_REPL_INFO_KCC_DSA_CONNECT_FAILURES,
94 # the failure information can be returned
95 self.kcc_failed_links = {}
96 self.kcc_failed_connections = set()
98 # Used in inter-site topology computation. A list
99 # of connections (by NTDSConnection object) that are
100 # to be kept when pruning un-needed NTDS Connections
101 self.kept_connections = set()
103 self.my_dsa_dnstr = None # My dsa DN
104 self.my_dsa = None # My dsa object
106 self.my_site_dnstr = None
111 def load_all_transports(self):
112 """Loads the inter-site transport objects for Sites
115 :raise KCCError: if no IP transport is found
118 res = self.samdb.search("CN=Inter-Site Transports,CN=Sites,%s" %
119 self.samdb.get_config_basedn(),
120 scope=ldb.SCOPE_SUBTREE,
121 expression="(objectClass=interSiteTransport)")
122 except ldb.LdbError, (enum, estr):
123 raise KCCError("Unable to find inter-site transports - (%s)" %
129 transport = Transport(dnstr)
131 transport.load_transport(self.samdb)
132 self.transport_table.setdefault(str(transport.guid),
134 if transport.name == 'IP':
135 self.ip_transport = transport
137 if self.ip_transport is None:
138 raise KCCError("there doesn't seem to be an IP transport")
140 def load_all_sitelinks(self):
141 """Loads the inter-site siteLink objects
144 :raise KCCError: if site-links aren't found
147 res = self.samdb.search("CN=Inter-Site Transports,CN=Sites,%s" %
148 self.samdb.get_config_basedn(),
149 scope=ldb.SCOPE_SUBTREE,
150 expression="(objectClass=siteLink)")
151 except ldb.LdbError, (enum, estr):
152 raise KCCError("Unable to find inter-site siteLinks - (%s)" % estr)
158 if dnstr in self.sitelink_table:
161 sitelink = SiteLink(dnstr)
163 sitelink.load_sitelink(self.samdb)
165 # Assign this siteLink to table
167 self.sitelink_table[dnstr] = sitelink
169 def load_site(self, dn_str):
170 """Helper for load_my_site and load_all_sites.
172 Put all the site's DSAs into the KCC indices.
174 :param dn_str: a site dn_str
175 :return: the Site object pertaining to the dn_str
177 site = Site(dn_str, unix_now)
178 site.load_site(self.samdb)
180 # We avoid replacing the site with an identical copy in case
181 # somewhere else has a reference to the old one, which would
182 # lead to all manner of confusion and chaos.
183 guid = str(site.site_guid)
184 if guid not in self.site_table:
185 self.site_table[guid] = site
186 self.dsa_by_dnstr.update(site.dsa_table)
187 self.dsa_by_guid.update((str(x.dsa_guid), x)
188 for x in site.dsa_table.values())
190 return self.site_table[guid]
192 def load_my_site(self):
193 """Load the Site object for the local DSA.
197 self.my_site_dnstr = ("CN=%s,CN=Sites,%s" % (
198 self.samdb.server_site_name(),
199 self.samdb.get_config_basedn()))
201 self.my_site = self.load_site(self.my_site_dnstr)
203 def load_all_sites(self):
204 """Discover all sites and create Site objects.
207 :raise: KCCError if sites can't be found
210 res = self.samdb.search("CN=Sites,%s" %
211 self.samdb.get_config_basedn(),
212 scope=ldb.SCOPE_SUBTREE,
213 expression="(objectClass=site)")
214 except ldb.LdbError, (enum, estr):
215 raise KCCError("Unable to find sites - (%s)" % estr)
218 sitestr = str(msg.dn)
219 self.load_site(sitestr)
221 def load_my_dsa(self):
222 """Discover my nTDSDSA dn thru the rootDSE entry
225 :raise: KCCError if DSA can't be found
227 dn = ldb.Dn(self.samdb, "<GUID=%s>" % self.samdb.get_ntds_GUID())
229 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
230 attrs=["objectGUID"])
231 except ldb.LdbError, (enum, estr):
232 logger.warning("Search for %s failed: %s. This typically happens"
233 " in --importldif mode due to lack of module"
234 " support.", dn, estr)
236 # We work around the failure above by looking at the
237 # dsServiceName that was put in the fake rootdse by
238 # the --exportldif, rather than the
239 # samdb.get_ntds_GUID(). The disadvantage is that this
240 # mode requires we modify the @ROOTDSE dnq to support
242 service_name_res = self.samdb.search(base="",
243 scope=ldb.SCOPE_BASE,
244 attrs=["dsServiceName"])
245 dn = ldb.Dn(self.samdb,
246 service_name_res[0]["dsServiceName"][0])
248 res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
249 attrs=["objectGUID"])
250 except ldb.LdbError, (enum, estr):
251 raise KCCError("Unable to find my nTDSDSA - (%s)" % estr)
254 raise KCCError("Unable to find my nTDSDSA at %s" %
257 ntds_guid = misc.GUID(self.samdb.get_ntds_GUID())
258 if misc.GUID(res[0]["objectGUID"][0]) != ntds_guid:
259 raise KCCError("Did not find the GUID we expected,"
260 " perhaps due to --importldif")
262 self.my_dsa_dnstr = str(res[0].dn)
264 self.my_dsa = self.my_site.get_dsa(self.my_dsa_dnstr)
266 if self.my_dsa_dnstr not in self.dsa_by_dnstr:
267 DEBUG_DARK_YELLOW("my_dsa %s isn't in self.dsas_by_dnstr:"
268 " it must be RODC.\n"
269 "Let's add it, because my_dsa is special!\n"
270 "(likewise for self.dsa_by_guid of course)" %
273 self.dsa_by_dnstr[self.my_dsa_dnstr] = self.my_dsa
274 self.dsa_by_guid[str(self.my_dsa.dsa_guid)] = self.my_dsa
276 def load_all_partitions(self):
277 """Discover and load all partitions.
279 Each NC is inserted into the part_table by partition
280 dn string (not the nCName dn string)
283 :raise: KCCError if partitions can't be found
286 res = self.samdb.search("CN=Partitions,%s" %
287 self.samdb.get_config_basedn(),
288 scope=ldb.SCOPE_SUBTREE,
289 expression="(objectClass=crossRef)")
290 except ldb.LdbError, (enum, estr):
291 raise KCCError("Unable to find partitions - (%s)" % estr)
294 partstr = str(msg.dn)
297 if partstr in self.part_table:
300 part = Partition(partstr)
302 part.load_partition(self.samdb)
303 self.part_table[partstr] = part
305 def should_be_present_test(self):
306 """Enumerate all loaded partitions and DSAs in local
307 site and test if NC should be present as replica
309 for partdn, part in self.part_table.items():
310 for dsadn, dsa in self.my_site.dsa_table.items():
311 needed, ro, partial = part.should_be_present(dsa)
312 logger.info("dsadn:%s\nncdn:%s\nneeded=%s:ro=%s:partial=%s\n" %
313 (dsadn, part.nc_dnstr, needed, ro, partial))
315 def refresh_failed_links_connections(self):
316 """Based on MS-ADTS 6.2.2.1"""
318 # Instead of NULL link with failure_count = 0, the tuple is
321 # LINKS: Refresh failed links
322 self.kcc_failed_links = {}
323 current, needed = self.my_dsa.get_rep_tables()
324 for replica in current.values():
325 # For every possible connection to replicate
326 for reps_from in replica.rep_repsFrom:
327 failure_count = reps_from.consecutive_sync_failures
328 if failure_count <= 0:
331 dsa_guid = str(reps_from.source_dsa_obj_guid)
332 time_first_failure = reps_from.last_success
333 last_result = reps_from.last_attempt
334 dns_name = reps_from.dns_name1
336 f = self.kcc_failed_links.get(dsa_guid)
338 f = KCCFailedObject(dsa_guid, failure_count,
339 time_first_failure, last_result,
341 self.kcc_failed_links[dsa_guid] = f
342 #elif f.failure_count == 0:
343 # f.failure_count = failure_count
344 # f.time_first_failure = time_first_failure
345 # f.last_result = last_result
347 f.failure_count = max(f.failure_count, failure_count)
348 f.time_first_failure = min(f.time_first_failure,
350 f.last_result = last_result
352 # CONNECTIONS: Refresh failed connections
353 restore_connections = set()
354 if opts.attempt_live_connections:
355 DEBUG("refresh_failed_links: checking if links are still down")
356 for connection in self.kcc_failed_connections:
358 drs_utils.drsuapi_connect(connection.dns_name, lp, creds)
359 # Failed connection is no longer failing
360 restore_connections.add(connection)
361 except drs_utils.drsException:
362 # Failed connection still failing
363 connection.failure_count += 1
365 DEBUG("refresh_failed_links: not checking live links because we\n"
366 "weren't asked to --attempt-live-connections")
368 # Remove the restored connections from the failed connections
369 self.kcc_failed_connections.difference_update(restore_connections)
371 def is_stale_link_connection(self, target_dsa):
372 """Check whether a link to a remote DSA is stale
374 Used in MS-ADTS 6.2.2.2 Intrasite Connection Creation
376 Returns True if the remote seems to have been down for at
377 least two hours, otherwise False.
379 :param target_dsa: the remote DSA object
380 :return: True if link is stale, otherwise False
382 failed_link = self.kcc_failed_links.get(str(target_dsa.dsa_guid))
384 # failure_count should be > 0, but check anyways
385 if failed_link.failure_count > 0:
386 unix_first_failure = \
387 nttime2unix(failed_link.time_first_failure)
388 # TODO guard against future
389 if unix_first_failure > unix_now:
390 logger.error("The last success time attribute for \
391 repsFrom is in the future!")
393 # Perform calculation in seconds
394 if (unix_now - unix_first_failure) > 60 * 60 * 2:
401 # TODO: This should be backed by some form of local database
402 def remove_unneeded_failed_links_connections(self):
403 # Remove all tuples in kcc_failed_links where failure count = 0
404 # In this implementation, this should never happen.
406 # Remove all connections which were not used this run or connections
407 # that became active during this run.
410 def remove_unneeded_ntdsconn(self, all_connected):
411 """Remove unneeded NTDS Connections once topology is calculated
413 Based on MS-ADTS 6.2.2.4 Removing Unnecessary Connections
415 :param all_connected: indicates whether all sites are connected
420 # New connections won't have GUIDs which are needed for
422 for cn_conn in mydsa.connect_table.values():
423 if cn_conn.guid is None:
425 cn_conn.guid = misc.GUID(str(uuid.uuid4()))
426 cn_conn.whenCreated = nt_now
428 cn_conn.load_connection(self.samdb)
430 for cn_conn in mydsa.connect_table.values():
432 s_dnstr = cn_conn.get_from_dnstr()
434 cn_conn.to_be_deleted = True
437 # Get the source DSA no matter what site
438 # XXX s_dsa is NEVER USED. It will be removed.
439 s_dsa = self.get_dsa(s_dnstr)
441 #XXX should an RODC be regarded as same site
442 same_site = s_dnstr in self.my_site.dsa_table
444 # Given an nTDSConnection object cn, if the DC with the
445 # nTDSDSA object dc that is the parent object of cn and
446 # the DC with the nTDSDA object referenced by cn!fromServer
447 # are in the same site, the KCC on dc deletes cn if all of
448 # the following are true:
450 # Bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options.
452 # No site settings object s exists for the local DC's site, or
453 # bit NTDSSETTINGS_OPT_IS_TOPL_CLEANUP_DISABLED is clear in
456 # Another nTDSConnection object cn2 exists such that cn and
457 # cn2 have the same parent object, cn!fromServer = cn2!fromServer,
460 # cn!whenCreated < cn2!whenCreated
462 # cn!whenCreated = cn2!whenCreated and
463 # cn!objectGUID < cn2!objectGUID
465 # Bit NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options
467 if not cn_conn.is_generated():
470 if self.my_site.is_cleanup_ntdsconn_disabled():
473 # Loop thru connections looking for a duplicate that
474 # fulfills the previous criteria
476 packed_guid = ndr_pack(cn_conn.guid)
477 for cn2_conn in mydsa.connect_table.values():
478 if cn2_conn is cn_conn:
481 s2_dnstr = cn2_conn.get_from_dnstr()
483 # If the NTDS Connections has a different
484 # fromServer field then no match
485 if s2_dnstr != s_dnstr:
489 lesser = (cn_conn.whenCreated < cn2_conn.whenCreated or
490 (cn_conn.whenCreated == cn2_conn.whenCreated and
491 packed_guid < ndr_pack(cn2_conn.guid)))
496 if lesser and not cn_conn.is_rodc_topology():
497 cn_conn.to_be_deleted = True
499 # Given an nTDSConnection object cn, if the DC with the nTDSDSA
500 # object dc that is the parent object of cn and the DC with
501 # the nTDSDSA object referenced by cn!fromServer are in
502 # different sites, a KCC acting as an ISTG in dc's site
503 # deletes cn if all of the following are true:
505 # Bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options.
507 # cn!fromServer references an nTDSDSA object for a DC
508 # in a site other than the local DC's site.
510 # The keepConnections sequence returned by
511 # CreateIntersiteConnections() does not contain
512 # cn!objectGUID, or cn is "superseded by" (see below)
513 # another nTDSConnection cn2 and keepConnections
514 # contains cn2!objectGUID.
516 # The return value of CreateIntersiteConnections()
519 # Bit NTDSCONN_OPT_RODC_TOPOLOGY is clear in
522 else: # different site
524 if not mydsa.is_istg():
527 if not cn_conn.is_generated():
531 # We are directly using this connection in intersite or
532 # we are using a connection which can supersede this one.
534 # MS-ADTS 6.2.2.4 - Removing Unnecessary Connections does not
535 # appear to be correct.
537 # 1. cn!fromServer and cn!parent appear inconsistent with
539 # 2. The repsFrom do not imply each other
541 if cn_conn in self.kept_connections: # and not_superceded:
544 # This is the result of create_intersite_connections
545 if not all_connected:
548 if not cn_conn.is_rodc_topology():
549 cn_conn.to_be_deleted = True
551 if mydsa.is_ro() or opts.readonly:
552 for connect in mydsa.connect_table.values():
553 if connect.to_be_deleted:
554 DEBUG_FN("TO BE DELETED:\n%s" % connect)
555 if connect.to_be_added:
556 DEBUG_FN("TO BE ADDED:\n%s" % connect)
558 # Peform deletion from our tables but perform
559 # no database modification
560 mydsa.commit_connections(self.samdb, ro=True)
562 # Commit any modified connections
563 mydsa.commit_connections(self.samdb)
565 def modify_repsFrom(self, n_rep, t_repsFrom, s_rep, s_dsa, cn_conn):
566 """Update an repsFrom object if required.
568 Part of MS-ADTS 6.2.2.5.
570 Update t_repsFrom if necessary to satisfy requirements. Such
571 updates are typically required when the IDL_DRSGetNCChanges
572 server has moved from one site to another--for example, to
573 enable compression when the server is moved from the
574 client's site to another site.
576 The repsFrom.update_flags bit field may be modified
577 auto-magically if any changes are made here. See
578 kcc_utils.RepsFromTo for gory details.
581 :param n_rep: NC replica we need
582 :param t_repsFrom: repsFrom tuple to modify
583 :param s_rep: NC replica at source DSA
584 :param s_dsa: source DSA
585 :param cn_conn: Local DSA NTDSConnection child
589 s_dnstr = s_dsa.dsa_dnstr
592 same_site = s_dnstr in self.my_site.dsa_table
594 # if schedule doesn't match then update and modify
595 times = convert_schedule_to_repltimes(cn_conn.schedule)
596 if times != t_repsFrom.schedule:
597 t_repsFrom.schedule = times
598 update |= drsuapi.DRSUAPI_DRS_UPDATE_SCHEDULE
600 # Bit DRS_PER_SYNC is set in replicaFlags if and only
601 # if nTDSConnection schedule has a value v that specifies
602 # scheduled replication is to be performed at least once
604 if cn_conn.is_schedule_minimum_once_per_week():
606 if ((t_repsFrom.replica_flags &
607 drsuapi.DRSUAPI_DRS_PER_SYNC) == 0x0):
608 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_PER_SYNC
610 # Bit DRS_INIT_SYNC is set in t.replicaFlags if and only
611 # if the source DSA and the local DC's nTDSDSA object are
612 # in the same site or source dsa is the FSMO role owner
613 # of one or more FSMO roles in the NC replica.
614 if same_site or n_rep.is_fsmo_role_owner(s_dnstr):
616 if ((t_repsFrom.replica_flags &
617 drsuapi.DRSUAPI_DRS_INIT_SYNC) == 0x0):
618 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_INIT_SYNC
620 # If bit NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT is set in
621 # cn!options, bit DRS_NEVER_NOTIFY is set in t.replicaFlags
622 # if and only if bit NTDSCONN_OPT_USE_NOTIFY is clear in
623 # cn!options. Otherwise, bit DRS_NEVER_NOTIFY is set in
624 # t.replicaFlags if and only if s and the local DC's
625 # nTDSDSA object are in different sites.
626 if ((cn_conn.options &
627 dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT) != 0x0):
629 if (cn_conn.options & dsdb.NTDSCONN_OPT_USE_NOTIFY) == 0x0:
632 # it LOOKS as if this next test is a bit silly: it
633 # checks the flag then sets it if it not set; the same
634 # effect could be achieved by unconditionally setting
635 # it. But in fact the repsFrom object has special
636 # magic attached to it, and altering replica_flags has
637 # side-effects. That is bad in my opinion, but there
639 if ((t_repsFrom.replica_flags &
640 drsuapi.DRSUAPI_DRS_NEVER_NOTIFY) == 0x0):
641 t_repsFrom.replica_flags |= \
642 drsuapi.DRSUAPI_DRS_NEVER_NOTIFY
646 if ((t_repsFrom.replica_flags &
647 drsuapi.DRSUAPI_DRS_NEVER_NOTIFY) == 0x0):
648 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_NEVER_NOTIFY
650 # Bit DRS_USE_COMPRESSION is set in t.replicaFlags if
651 # and only if s and the local DC's nTDSDSA object are
652 # not in the same site and the
653 # NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION bit is
654 # clear in cn!options
655 if (not same_site and
657 dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION) == 0x0):
659 if ((t_repsFrom.replica_flags &
660 drsuapi.DRSUAPI_DRS_USE_COMPRESSION) == 0x0):
661 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_USE_COMPRESSION
663 # Bit DRS_TWOWAY_SYNC is set in t.replicaFlags if and only
664 # if bit NTDSCONN_OPT_TWOWAY_SYNC is set in cn!options.
665 if (cn_conn.options & dsdb.NTDSCONN_OPT_TWOWAY_SYNC) != 0x0:
667 if ((t_repsFrom.replica_flags &
668 drsuapi.DRSUAPI_DRS_TWOWAY_SYNC) == 0x0):
669 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_TWOWAY_SYNC
671 # Bits DRS_DISABLE_AUTO_SYNC and DRS_DISABLE_PERIODIC_SYNC are
672 # set in t.replicaFlags if and only if cn!enabledConnection = false.
673 if not cn_conn.is_enabled():
675 if ((t_repsFrom.replica_flags &
676 drsuapi.DRSUAPI_DRS_DISABLE_AUTO_SYNC) == 0x0):
677 t_repsFrom.replica_flags |= \
678 drsuapi.DRSUAPI_DRS_DISABLE_AUTO_SYNC
680 if ((t_repsFrom.replica_flags &
681 drsuapi.DRSUAPI_DRS_DISABLE_PERIODIC_SYNC) == 0x0):
682 t_repsFrom.replica_flags |= \
683 drsuapi.DRSUAPI_DRS_DISABLE_PERIODIC_SYNC
685 # If s and the local DC's nTDSDSA object are in the same site,
686 # cn!transportType has no value, or the RDN of cn!transportType
689 # Bit DRS_MAIL_REP in t.replicaFlags is clear.
691 # t.uuidTransport = NULL GUID.
693 # t.uuidDsa = The GUID-based DNS name of s.
697 # Bit DRS_MAIL_REP in t.replicaFlags is set.
699 # If x is the object with dsname cn!transportType,
700 # t.uuidTransport = x!objectGUID.
702 # Let a be the attribute identified by
703 # x!transportAddressAttribute. If a is
704 # the dNSHostName attribute, t.uuidDsa = the GUID-based
705 # DNS name of s. Otherwise, t.uuidDsa = (s!parent)!a.
707 # It appears that the first statement i.e.
709 # "If s and the local DC's nTDSDSA object are in the same
710 # site, cn!transportType has no value, or the RDN of
711 # cn!transportType is CN=IP:"
713 # could be a slightly tighter statement if it had an "or"
714 # between each condition. I believe this should
717 # IF (same-site) OR (no-value) OR (type-ip)
719 # because IP should be the primary transport mechanism
720 # (even in inter-site) and the absense of the transportType
721 # attribute should always imply IP no matter if its multi-site
723 # NOTE MS-TECH INCORRECT:
725 # All indications point to these statements above being
726 # incorrectly stated:
728 # t.uuidDsa = The GUID-based DNS name of s.
730 # Let a be the attribute identified by
731 # x!transportAddressAttribute. If a is
732 # the dNSHostName attribute, t.uuidDsa = the GUID-based
733 # DNS name of s. Otherwise, t.uuidDsa = (s!parent)!a.
735 # because the uuidDSA is a GUID and not a GUID-base DNS
736 # name. Nor can uuidDsa hold (s!parent)!a if not
737 # dNSHostName. What should have been said is:
739 # t.naDsa = The GUID-based DNS name of s
741 # That would also be correct if transportAddressAttribute
742 # were "mailAddress" because (naDsa) can also correctly
743 # hold the SMTP ISM service address.
745 nastr = "%s._msdcs.%s" % (s_dsa.dsa_guid, self.samdb.forest_dns_name())
747 # We're not currently supporting SMTP replication
748 # so is_smtp_replication_available() is currently
749 # always returning False
751 cn_conn.transport_dnstr is None or
752 cn_conn.transport_dnstr.find("CN=IP") == 0 or
753 not is_smtp_replication_available())):
755 if ((t_repsFrom.replica_flags &
756 drsuapi.DRSUAPI_DRS_MAIL_REP) != 0x0):
757 t_repsFrom.replica_flags &= ~drsuapi.DRSUAPI_DRS_MAIL_REP
759 t_repsFrom.transport_guid = misc.GUID()
761 # See (NOTE MS-TECH INCORRECT) above
762 if t_repsFrom.version == 0x1:
763 if t_repsFrom.dns_name1 is None or \
764 t_repsFrom.dns_name1 != nastr:
765 t_repsFrom.dns_name1 = nastr
767 if t_repsFrom.dns_name1 is None or \
768 t_repsFrom.dns_name2 is None or \
769 t_repsFrom.dns_name1 != nastr or \
770 t_repsFrom.dns_name2 != nastr:
771 t_repsFrom.dns_name1 = nastr
772 t_repsFrom.dns_name2 = nastr
775 # XXX This entire branch is NEVER used! Because we don't do SMTP!
776 # (see the if condition above). Just close your eyes here.
777 if ((t_repsFrom.replica_flags &
778 drsuapi.DRSUAPI_DRS_MAIL_REP) == 0x0):
779 t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_MAIL_REP
781 # We have a transport type but its not an
782 # object in the database
783 if cn_conn.transport_guid not in self.transport_table:
784 raise KCCError("Missing inter-site transport - (%s)" %
785 cn_conn.transport_dnstr)
787 x_transport = self.transport_table[str(cn_conn.transport_guid)]
789 if t_repsFrom.transport_guid != x_transport.guid:
790 t_repsFrom.transport_guid = x_transport.guid
792 # See (NOTE MS-TECH INCORRECT) above
793 if x_transport.address_attr == "dNSHostName":
795 if t_repsFrom.version == 0x1:
796 if t_repsFrom.dns_name1 is None or \
797 t_repsFrom.dns_name1 != nastr:
798 t_repsFrom.dns_name1 = nastr
800 if t_repsFrom.dns_name1 is None or \
801 t_repsFrom.dns_name2 is None or \
802 t_repsFrom.dns_name1 != nastr or \
803 t_repsFrom.dns_name2 != nastr:
804 t_repsFrom.dns_name1 = nastr
805 t_repsFrom.dns_name2 = nastr
808 # MS tech specification says we retrieve the named
809 # attribute in "transportAddressAttribute" from the parent of
812 pdnstr = s_dsa.get_parent_dnstr()
813 attrs = [x_transport.address_attr]
815 res = self.samdb.search(base=pdnstr, scope=ldb.SCOPE_BASE,
817 except ldb.LdbError, (enum, estr):
819 "Unable to find attr (%s) for (%s) - (%s)" %
820 (x_transport.address_attr, pdnstr, estr))
823 nastr = str(msg[x_transport.address_attr][0])
825 # See (NOTE MS-TECH INCORRECT) above
826 if t_repsFrom.version == 0x1:
827 if t_repsFrom.dns_name1 is None or \
828 t_repsFrom.dns_name1 != nastr:
829 t_repsFrom.dns_name1 = nastr
831 if t_repsFrom.dns_name1 is None or \
832 t_repsFrom.dns_name2 is None or \
833 t_repsFrom.dns_name1 != nastr or \
834 t_repsFrom.dns_name2 != nastr:
836 t_repsFrom.dns_name1 = nastr
837 t_repsFrom.dns_name2 = nastr
839 if t_repsFrom.is_modified():
840 logger.debug("modify_repsFrom(): %s" % t_repsFrom)
842 def is_repsFrom_implied(self, n_rep, cn_conn):
843 """Given a NC replica and NTDS Connection, determine if the connection
844 implies a repsFrom tuple should be present from the source DSA listed
845 in the connection to the naming context
847 :param n_rep: NC replica
848 :param conn: NTDS Connection
849 ::returns (True || False), source DSA:
851 #XXX different conditions for "implies" than MS-ADTS 6.2.2
853 # NTDS Connection must satisfy all the following criteria
854 # to imply a repsFrom tuple is needed:
856 # cn!enabledConnection = true.
857 # cn!options does not contain NTDSCONN_OPT_RODC_TOPOLOGY.
858 # cn!fromServer references an nTDSDSA object.
862 if cn_conn.is_enabled() and not cn_conn.is_rodc_topology():
863 s_dnstr = cn_conn.get_from_dnstr()
864 if s_dnstr is not None:
865 s_dsa = self.get_dsa(s_dnstr)
867 # No DSA matching this source DN string?
871 # To imply a repsFrom tuple is needed, each of these
874 # An NC replica of the NC "is present" on the DC to
875 # which the nTDSDSA object referenced by cn!fromServer
878 # An NC replica of the NC "should be present" on
880 s_rep = s_dsa.get_current_replica(n_rep.nc_dnstr)
882 if s_rep is None or not s_rep.is_present():
885 # To imply a repsFrom tuple is needed, each of these
888 # The NC replica on the DC referenced by cn!fromServer is
889 # a writable replica or the NC replica that "should be
890 # present" on the local DC is a partial replica.
892 # The NC is not a domain NC, the NC replica that
893 # "should be present" on the local DC is a partial
894 # replica, cn!transportType has no value, or
895 # cn!transportType has an RDN of CN=IP.
897 implied = (not s_rep.is_ro() or n_rep.is_partial()) and \
898 (not n_rep.is_domain() or
899 n_rep.is_partial() or
900 cn_conn.transport_dnstr is None or
901 cn_conn.transport_dnstr.find("CN=IP") == 0)
908 def translate_ntdsconn(self, current_dsa=None):
909 """Adjust repsFrom to match NTDSConnections
911 This function adjusts values of repsFrom abstract attributes of NC
912 replicas on the local DC to match those implied by
913 nTDSConnection objects.
915 Based on [MS-ADTS] 6.2.2.5
917 :param current_dsa: optional DSA on whose behalf we are acting.
922 if current_dsa is None:
923 current_dsa = self.my_dsa
925 if current_dsa.is_translate_ntdsconn_disabled():
926 logger.debug("skipping translate_ntdsconn() "
927 "because disabling flag is set")
930 logger.debug("translate_ntdsconn(): enter")
932 current_rep_table, needed_rep_table = current_dsa.get_rep_tables()
934 # Filled in with replicas we currently have that need deleting
937 # We're using the MS notation names here to allow
938 # correlation back to the published algorithm.
940 # n_rep - NC replica (n)
941 # t_repsFrom - tuple (t) in n!repsFrom
942 # s_dsa - Source DSA of the replica. Defined as nTDSDSA
943 # object (s) such that (s!objectGUID = t.uuidDsa)
944 # In our IDL representation of repsFrom the (uuidDsa)
945 # attribute is called (source_dsa_obj_guid)
946 # cn_conn - (cn) is nTDSConnection object and child of the local
947 # DC's nTDSDSA object and (cn!fromServer = s)
948 # s_rep - source DSA replica of n
950 # If we have the replica and its not needed
951 # then we add it to the "to be deleted" list.
952 for dnstr in current_rep_table:
953 if dnstr not in needed_rep_table:
954 delete_reps.add(dnstr)
956 DEBUG_FN('current %d needed %d delete %d' % (len(current_rep_table),
957 len(needed_rep_table), len(delete_reps)))
960 DEBUG('deleting these reps: %s' % delete_reps)
961 for dnstr in delete_reps:
962 del current_rep_table[dnstr]
964 # Now perform the scan of replicas we'll need
965 # and compare any current repsFrom against the
967 for n_rep in needed_rep_table.values():
969 # load any repsFrom and fsmo roles as we'll
970 # need them during connection translation
971 n_rep.load_repsFrom(self.samdb)
972 n_rep.load_fsmo_roles(self.samdb)
974 # Loop thru the existing repsFrom tupples (if any)
975 # XXX This is a list and could contain duplicates
976 # (multiple load_repsFrom calls)
977 for t_repsFrom in n_rep.rep_repsFrom:
979 # for each tuple t in n!repsFrom, let s be the nTDSDSA
980 # object such that s!objectGUID = t.uuidDsa
981 guidstr = str(t_repsFrom.source_dsa_obj_guid)
982 s_dsa = self.get_dsa_by_guidstr(guidstr)
984 # Source dsa is gone from config (strange)
985 # so cleanup stale repsFrom for unlisted DSA
987 logger.warning("repsFrom source DSA guid (%s) not found" %
989 t_repsFrom.to_be_deleted = True
992 s_dnstr = s_dsa.dsa_dnstr
994 # Retrieve my DSAs connection object (if it exists)
995 # that specifies the fromServer equivalent to
996 # the DSA that is specified in the repsFrom source
997 connections = current_dsa.get_connection_by_from_dnstr(s_dnstr)
1002 for con in connections:
1003 if con.is_rodc_topology():
1007 # Let (cn) be the nTDSConnection object such that (cn)
1008 # is a child of the local DC's nTDSDSA object and
1009 # (cn!fromServer = s) and (cn!options) does not contain
1010 # NTDSCONN_OPT_RODC_TOPOLOGY or NULL if no such (cn) exists.
1012 # KCC removes this repsFrom tuple if any of the following
1017 #XXX varying possible interpretations of rodc_topology
1019 t_repsFrom.to_be_deleted = True
1022 # [...] KCC removes this repsFrom tuple if:
1024 # No NC replica of the NC "is present" on DSA that
1025 # would be source of replica
1027 # A writable replica of the NC "should be present" on
1028 # the local DC, but a partial replica "is present" on
1030 s_rep = s_dsa.get_current_replica(n_rep.nc_dnstr)
1032 if s_rep is None or not s_rep.is_present() or \
1033 (not n_rep.is_ro() and s_rep.is_partial()):
1035 t_repsFrom.to_be_deleted = True
1038 # If the KCC did not remove t from n!repsFrom, it updates t
1039 self.modify_repsFrom(n_rep, t_repsFrom, s_rep, s_dsa, cn_conn)
1041 # Loop thru connections and add implied repsFrom tuples
1042 # for each NTDSConnection under our local DSA if the
1043 # repsFrom is not already present
1044 for cn_conn in current_dsa.connect_table.values():
1046 implied, s_dsa = self.is_repsFrom_implied(n_rep, cn_conn)
1050 # Loop thru the existing repsFrom tupples (if any) and
1051 # if we already have a tuple for this connection then
1052 # no need to proceed to add. It will have been changed
1053 # to have the correct attributes above
1054 for t_repsFrom in n_rep.rep_repsFrom:
1055 guidstr = str(t_repsFrom.source_dsa_obj_guid)
1057 if s_dsa is self.get_dsa_by_guidstr(guidstr):
1064 # Create a new RepsFromTo and proceed to modify
1065 # it according to specification
1066 t_repsFrom = RepsFromTo(n_rep.nc_dnstr)
1068 t_repsFrom.source_dsa_obj_guid = s_dsa.dsa_guid
1070 s_rep = s_dsa.get_current_replica(n_rep.nc_dnstr)
1072 self.modify_repsFrom(n_rep, t_repsFrom, s_rep, s_dsa, cn_conn)
1074 # Add to our NC repsFrom as this is newly computed
1075 if t_repsFrom.is_modified():
1076 n_rep.rep_repsFrom.append(t_repsFrom)
1079 # Display any to be deleted or modified repsFrom
1080 text = n_rep.dumpstr_to_be_deleted()
1082 logger.info("TO BE DELETED:\n%s" % text)
1083 text = n_rep.dumpstr_to_be_modified()
1085 logger.info("TO BE MODIFIED:\n%s" % text)
1087 # Peform deletion from our tables but perform
1088 # no database modification
1089 n_rep.commit_repsFrom(self.samdb, ro=True)
1091 # Commit any modified repsFrom to the NC replica
1092 n_rep.commit_repsFrom(self.samdb)
1094 def merge_failed_links(self):
1095 """Merge of kCCFailedLinks and kCCFailedLinks from bridgeheads.
1097 The KCC on a writable DC attempts to merge the link and connection
1098 failure information from bridgehead DCs in its own site to help it
1099 identify failed bridgehead DCs.
1101 Based on MS-ADTS 6.2.2.3.2 "Merge of kCCFailedLinks and kCCFailedLinks
1104 :param ping: An oracle of current bridgehead availability
1107 # 1. Queries every bridgehead server in your site (other than yourself)
1108 # 2. For every ntDSConnection that references a server in a different
1109 # site merge all the failure info
1111 # XXX - not implemented yet
1112 if opts.attempt_live_connections:
1113 DEBUG_RED("merge_failed_links() is NOT IMPLEMENTED")
1115 DEBUG_FN("skipping merge_failed_links() because it requires "
1116 "real network connections\n"
1117 "and we weren't asked to --attempt-live-connections")
1119 def setup_graph(self, part):
1120 """Set up an intersite graph
1122 An intersite graph has a Vertex for each site object, a
1123 MultiEdge for each SiteLink object, and a MutliEdgeSet for
1124 each siteLinkBridge object (or implied siteLinkBridge). It
1125 reflects the intersite topology in a slightly more abstract
1128 Roughly corresponds to MS-ADTS 6.2.2.3.4.3
1130 :param part: a Partition object
1131 :returns: an InterSiteGraph object
1135 g = IntersiteGraph()
1137 for site_guid, site in self.site_table.items():
1138 vertex = Vertex(site, part)
1139 vertex.guid = site_guid
1140 vertex.ndrpacked_guid = ndr_pack(site.site_guid)
1141 g.vertices.add(vertex)
1143 if not guid_to_vertex.get(site_guid):
1144 guid_to_vertex[site_guid] = []
1146 guid_to_vertex[site_guid].append(vertex)
1148 connected_vertices = set()
1149 for transport_guid, transport in self.transport_table.items():
1150 # Currently only ever "IP"
1151 if transport.name != 'IP':
1152 DEBUG_FN("setup_graph is ignoring transport %s" %
1155 for site_link_dn, site_link in self.sitelink_table.items():
1156 new_edge = create_edge(transport_guid, site_link,
1158 connected_vertices.update(new_edge.vertices)
1159 g.edges.add(new_edge)
1161 # If 'Bridge all site links' is enabled and Win2k3 bridges required
1163 # NTDSTRANSPORT_OPT_BRIDGES_REQUIRED 0x00000002
1164 # No documentation for this however, ntdsapi.h appears to have:
1165 # NTDSSETTINGS_OPT_W2K3_BRIDGES_REQUIRED = 0x00001000
1166 if (((self.my_site.site_options & 0x00000002) == 0
1167 and (self.my_site.site_options & 0x00001000) == 0)):
1168 g.edge_set.add(create_auto_edge_set(g, transport_guid))
1170 # TODO get all site link bridges
1171 for site_link_bridge in []:
1172 g.edge_set.add(create_edge_set(g, transport_guid,
1175 g.connected_vertices = connected_vertices
1177 #be less verbose in dot file output unless --debug
1178 do_dot_files = opts.dot_files and opts.debug
1180 for edge in g.edges:
1181 for a, b in itertools.combinations(edge.vertices, 2):
1182 dot_edges.append((a.site.site_dnstr, b.site.site_dnstr))
1183 verify_properties = ()
1184 verify_and_dot('site_edges', dot_edges, directed=False,
1185 label=self.my_dsa_dnstr,
1186 properties=verify_properties, debug=DEBUG,
1188 dot_files=do_dot_files)
1192 def get_bridgehead(self, site, part, transport, partial_ok, detect_failed):
1193 """Get a bridghead DC for a site.
1195 Part of MS-ADTS 6.2.2.3.4.4
1197 :param site: site object representing for which a bridgehead
1199 :param part: crossRef for NC to replicate.
1200 :param transport: interSiteTransport object for replication
1202 :param partial_ok: True if a DC containing a partial
1203 replica or a full replica will suffice, False if only
1204 a full replica will suffice.
1205 :param detect_failed: True to detect failed DCs and route
1206 replication traffic around them, False to assume no DC
1208 :return: dsa object for the bridgehead DC or None
1211 bhs = self.get_all_bridgeheads(site, part, transport,
1212 partial_ok, detect_failed)
1214 DEBUG_MAGENTA("get_bridgehead:\n\tsitedn=%s\n\tbhdn=None" %
1218 DEBUG_GREEN("get_bridgehead:\n\tsitedn=%s\n\tbhdn=%s" %
1219 (site.site_dnstr, bhs[0].dsa_dnstr))
1222 def get_all_bridgeheads(self, site, part, transport,
1223 partial_ok, detect_failed):
1224 """Get all bridghead DCs satisfying the given criteria
1226 :param site: site object representing the site for which
1227 bridgehead DCs are desired.
1228 :param part: partition for NC to replicate.
1229 :param transport: interSiteTransport object for
1230 replication traffic.
1231 :param partial_ok: True if a DC containing a partial
1232 replica or a full replica will suffice, False if
1233 only a full replica will suffice.
1234 :param detect_failed: True to detect failed DCs and route
1235 replication traffic around them, FALSE to assume
1237 ::returns: list of dsa object for available bridgehead
1243 logger.debug("get_all_bridgeheads: %s" % transport.name)
1244 if 'Site-5' in site.site_dnstr:
1245 DEBUG_RED("get_all_bridgeheads with %s, part%s, partial_ok %s"
1246 " detect_failed %s" % (site.site_dnstr, part.partstr,
1247 partial_ok, detect_failed))
1248 logger.debug(site.rw_dsa_table)
1249 for dsa in site.rw_dsa_table.values():
1251 pdnstr = dsa.get_parent_dnstr()
1253 # IF t!bridgeheadServerListBL has one or more values and
1254 # t!bridgeheadServerListBL does not contain a reference
1255 # to the parent object of dc then skip dc
1256 if ((len(transport.bridgehead_list) != 0 and
1257 pdnstr not in transport.bridgehead_list)):
1260 # IF dc is in the same site as the local DC
1261 # IF a replica of cr!nCName is not in the set of NC replicas
1262 # that "should be present" on dc or a partial replica of the
1263 # NC "should be present" but partialReplicasOkay = FALSE
1265 if self.my_site.same_site(dsa):
1266 needed, ro, partial = part.should_be_present(dsa)
1267 if not needed or (partial and not partial_ok):
1269 rep = dsa.get_current_replica(part.nc_dnstr)
1272 # IF an NC replica of cr!nCName is not in the set of NC
1273 # replicas that "are present" on dc or a partial replica of
1274 # the NC "is present" but partialReplicasOkay = FALSE
1277 rep = dsa.get_current_replica(part.nc_dnstr)
1278 if rep is None or (rep.is_partial() and not partial_ok):
1281 # IF AmIRODC() and cr!nCName corresponds to default NC then
1282 # Let dsaobj be the nTDSDSA object of the dc
1283 # IF dsaobj.msDS-Behavior-Version < DS_DOMAIN_FUNCTION_2008
1285 if self.my_dsa.is_ro() and rep is not None and rep.is_default():
1286 if not dsa.is_minimum_behavior(dsdb.DS_DOMAIN_FUNCTION_2008):
1289 # IF t!name != "IP" and the parent object of dc has no value for
1290 # the attribute specified by t!transportAddressAttribute
1292 if transport.name != "IP":
1293 # MS tech specification says we retrieve the named
1294 # attribute in "transportAddressAttribute" from the parent
1297 attrs = [transport.address_attr]
1299 res = self.samdb.search(base=pdnstr, scope=ldb.SCOPE_BASE,
1301 except ldb.LdbError, (enum, estr):
1305 if transport.address_attr not in msg:
1307 #XXX nastr is NEVER USED. It will be removed.
1308 nastr = str(msg[transport.address_attr][0])
1310 # IF BridgeheadDCFailed(dc!objectGUID, detectFailedDCs) = TRUE
1312 if self.is_bridgehead_failed(dsa, detect_failed):
1313 DEBUG("bridgehead is failed")
1316 logger.debug("get_all_bridgeheads: dsadn=%s" % dsa.dsa_dnstr)
1319 # IF bit NTDSSETTINGS_OPT_IS_RAND_BH_SELECTION_DISABLED is set in
1321 # SORT bhs such that all GC servers precede DCs that are not GC
1322 # servers, and otherwise by ascending objectGUID
1324 # SORT bhs in a random order
1325 if site.is_random_bridgehead_disabled():
1326 bhs.sort(sort_dsa_by_gc_and_guid)
1332 def is_bridgehead_failed(self, dsa, detect_failed):
1333 """Determine whether a given DC is known to be in a failed state
1334 ::returns: True if and only if the DC should be considered failed
1336 Here we DEPART from the pseudo code spec which appears to be
1337 wrong. It says, in full:
1339 /***** BridgeheadDCFailed *****/
1340 /* Determine whether a given DC is known to be in a failed state.
1341 * IN: objectGUID - objectGUID of the DC's nTDSDSA object.
1342 * IN: detectFailedDCs - TRUE if and only failed DC detection is
1344 * RETURNS: TRUE if and only if the DC should be considered to be in a
1347 BridgeheadDCFailed(IN GUID objectGUID, IN bool detectFailedDCs) : bool
1349 IF bit NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED is set in
1350 the options attribute of the site settings object for the local
1353 ELSEIF a tuple z exists in the kCCFailedLinks or
1354 kCCFailedConnections variables such that z.UUIDDsa =
1355 objectGUID, z.FailureCount > 1, and the current time -
1356 z.TimeFirstFailure > 2 hours
1359 RETURN detectFailedDCs
1363 where you will see detectFailedDCs is not behaving as
1364 advertised -- it is acting as a default return code in the
1365 event that a failure is not detected, not a switch turning
1366 detection on or off. Elsewhere the documentation seems to
1367 concur with the comment rather than the code.
1369 if not detect_failed:
1372 # NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED = 0x00000008
1373 # When DETECT_STALE_DISABLED, we can never know of if
1374 # it's in a failed state
1375 if self.my_site.site_options & 0x00000008:
1378 return self.is_stale_link_connection(dsa)
1380 def create_connection(self, part, rbh, rsite, transport,
1381 lbh, lsite, link_opt, link_sched,
1382 partial_ok, detect_failed):
1383 """Create an nTDSConnection object with the given parameters
1384 if one does not already exist.
1386 :param part: crossRef object for the NC to replicate.
1387 :param rbh: nTDSDSA object for DC to act as the
1388 IDL_DRSGetNCChanges server (which is in a site other
1389 than the local DC's site).
1390 :param rsite: site of the rbh
1391 :param transport: interSiteTransport object for the transport
1392 to use for replication traffic.
1393 :param lbh: nTDSDSA object for DC to act as the
1394 IDL_DRSGetNCChanges client (which is in the local DC's site).
1395 :param lsite: site of the lbh
1396 :param link_opt: Replication parameters (aggregated siteLink options,
1398 :param link_sched: Schedule specifying the times at which
1399 to begin replicating.
1400 :partial_ok: True if bridgehead DCs containing partial
1401 replicas of the NC are acceptable.
1402 :param detect_failed: True to detect failed DCs and route
1403 replication traffic around them, FALSE to assume no DC
1406 rbhs_all = self.get_all_bridgeheads(rsite, part, transport,
1408 rbh_table = {x.dsa_dnstr: x for x in rbhs_all}
1410 DEBUG_GREY("rbhs_all: %s %s" % (len(rbhs_all),
1411 [x.dsa_dnstr for x in rbhs_all]))
1413 # MS-TECH says to compute rbhs_avail but then doesn't use it
1414 # rbhs_avail = self.get_all_bridgeheads(rsite, part, transport,
1415 # partial_ok, detect_failed)
1417 lbhs_all = self.get_all_bridgeheads(lsite, part, transport,
1420 lbhs_all.append(lbh)
1422 DEBUG_GREY("lbhs_all: %s %s" % (len(lbhs_all),
1423 [x.dsa_dnstr for x in lbhs_all]))
1425 # MS-TECH says to compute lbhs_avail but then doesn't use it
1426 # lbhs_avail = self.get_all_bridgeheads(lsite, part, transport,
1427 # partial_ok, detect_failed)
1429 # FOR each nTDSConnection object cn such that the parent of cn is
1430 # a DC in lbhsAll and cn!fromServer references a DC in rbhsAll
1431 for ldsa in lbhs_all:
1432 for cn in ldsa.connect_table.values():
1434 rdsa = rbh_table.get(cn.from_dnstr)
1438 DEBUG_DARK_YELLOW("rdsa is %s" % rdsa.dsa_dnstr)
1439 # IF bit NTDSCONN_OPT_IS_GENERATED is set in cn!options and
1440 # NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options and
1441 # cn!transportType references t
1442 if ((cn.is_generated() and
1443 not cn.is_rodc_topology() and
1444 cn.transport_guid == transport.guid)):
1446 # IF bit NTDSCONN_OPT_USER_OWNED_SCHEDULE is clear in
1447 # cn!options and cn!schedule != sch
1448 # Perform an originating update to set cn!schedule to
1450 if ((not cn.is_user_owned_schedule() and
1451 not cn.is_equivalent_schedule(link_sched))):
1452 cn.schedule = link_sched
1453 cn.set_modified(True)
1455 # IF bits NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
1456 # NTDSCONN_OPT_USE_NOTIFY are set in cn
1457 if cn.is_override_notify_default() and \
1460 # IF bit NTDSSITELINK_OPT_USE_NOTIFY is clear in
1462 # Perform an originating update to clear bits
1463 # NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
1464 # NTDSCONN_OPT_USE_NOTIFY in cn!options
1465 if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) == 0:
1467 ~(dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
1468 dsdb.NTDSCONN_OPT_USE_NOTIFY)
1469 cn.set_modified(True)
1474 # IF bit NTDSSITELINK_OPT_USE_NOTIFY is set in
1476 # Perform an originating update to set bits
1477 # NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
1478 # NTDSCONN_OPT_USE_NOTIFY in cn!options
1479 if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) != 0:
1481 (dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
1482 dsdb.NTDSCONN_OPT_USE_NOTIFY)
1483 cn.set_modified(True)
1485 # IF bit NTDSCONN_OPT_TWOWAY_SYNC is set in cn!options
1486 if cn.is_twoway_sync():
1488 # IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is clear in
1490 # Perform an originating update to clear bit
1491 # NTDSCONN_OPT_TWOWAY_SYNC in cn!options
1492 if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) == 0:
1493 cn.options &= ~dsdb.NTDSCONN_OPT_TWOWAY_SYNC
1494 cn.set_modified(True)
1499 # IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is set in
1501 # Perform an originating update to set bit
1502 # NTDSCONN_OPT_TWOWAY_SYNC in cn!options
1503 if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) != 0:
1504 cn.options |= dsdb.NTDSCONN_OPT_TWOWAY_SYNC
1505 cn.set_modified(True)
1507 # IF bit NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION is set
1509 if cn.is_intersite_compression_disabled():
1511 # IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is clear
1513 # Perform an originating update to clear bit
1514 # NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in
1517 dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) == 0):
1519 ~dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
1520 cn.set_modified(True)
1524 # IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is set in
1526 # Perform an originating update to set bit
1527 # NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in
1530 dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) != 0):
1532 dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
1533 cn.set_modified(True)
1535 # Display any modified connection
1537 if cn.to_be_modified:
1538 logger.info("TO BE MODIFIED:\n%s" % cn)
1540 ldsa.commit_connections(self.samdb, ro=True)
1542 ldsa.commit_connections(self.samdb)
1545 valid_connections = 0
1547 # FOR each nTDSConnection object cn such that cn!parent is
1548 # a DC in lbhsAll and cn!fromServer references a DC in rbhsAll
1549 for ldsa in lbhs_all:
1550 for cn in ldsa.connect_table.values():
1552 rdsa = rbh_table.get(cn.from_dnstr)
1556 DEBUG_DARK_YELLOW("round 2: rdsa is %s" % rdsa.dsa_dnstr)
1558 # IF (bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options or
1559 # cn!transportType references t) and
1560 # NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options
1561 if (((not cn.is_generated() or
1562 cn.transport_guid == transport.guid) and
1563 not cn.is_rodc_topology())):
1565 # LET rguid be the objectGUID of the nTDSDSA object
1566 # referenced by cn!fromServer
1567 # LET lguid be (cn!parent)!objectGUID
1569 # IF BridgeheadDCFailed(rguid, detectFailedDCs) = FALSE and
1570 # BridgeheadDCFailed(lguid, detectFailedDCs) = FALSE
1571 # Increment cValidConnections by 1
1572 if ((not self.is_bridgehead_failed(rdsa, detect_failed) and
1573 not self.is_bridgehead_failed(ldsa, detect_failed))):
1574 valid_connections += 1
1576 # IF keepConnections does not contain cn!objectGUID
1577 # APPEND cn!objectGUID to keepConnections
1578 self.kept_connections.add(cn)
1581 DEBUG_RED("valid connections %d" % valid_connections)
1582 DEBUG("kept_connections:\n%s" % (self.kept_connections,))
1583 # IF cValidConnections = 0
1584 if valid_connections == 0:
1586 # LET opt be NTDSCONN_OPT_IS_GENERATED
1587 opt = dsdb.NTDSCONN_OPT_IS_GENERATED
1589 # IF bit NTDSSITELINK_OPT_USE_NOTIFY is set in ri.Options
1590 # SET bits NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
1591 # NTDSCONN_OPT_USE_NOTIFY in opt
1592 if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) != 0:
1593 opt |= (dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
1594 dsdb.NTDSCONN_OPT_USE_NOTIFY)
1596 # IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is set in ri.Options
1597 # SET bit NTDSCONN_OPT_TWOWAY_SYNC opt
1598 if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) != 0:
1599 opt |= dsdb.NTDSCONN_OPT_TWOWAY_SYNC
1601 # IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is set in
1603 # SET bit NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in opt
1605 dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) != 0):
1606 opt |= dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
1608 # Perform an originating update to create a new nTDSConnection
1609 # object cn that is a child of lbh, cn!enabledConnection = TRUE,
1610 # cn!options = opt, cn!transportType is a reference to t,
1611 # cn!fromServer is a reference to rbh, and cn!schedule = sch
1612 DEBUG_FN("new connection, KCC dsa: %s" % self.my_dsa.dsa_dnstr)
1613 cn = lbh.new_connection(opt, 0, transport,
1614 rbh.dsa_dnstr, link_sched)
1616 # Display any added connection
1619 logger.info("TO BE ADDED:\n%s" % cn)
1621 lbh.commit_connections(self.samdb, ro=True)
1623 lbh.commit_connections(self.samdb)
1625 # APPEND cn!objectGUID to keepConnections
1626 self.kept_connections.add(cn)
1628 def add_transports(self, vertex, local_vertex, graph, detect_failed):
1629 """Build a Vertex's transport lists
1631 Each vertex has accept_red_red and accept_black lists that
1632 list what transports they accept under various conditions. The
1633 only transport that is ever accepted is IP, and a dummy extra
1634 transport called "EDGE_TYPE_ALL".
1636 Part of MS-ADTS 6.2.2.3.4.3 -- ColorVertices
1638 :param vertex: the remote vertex we are thinking about
1639 :param local_vertex: the vertex relating to the local site.
1640 :param graph: the intersite graph
1641 :param detect_failed: whether to detect failed links
1642 :return: True if some bridgeheads were not found
1644 # The docs ([MS-ADTS] 6.2.2.3.4.3) say to use local_vertex
1645 # here, but using vertex seems to make more sense. That is,
1646 # the docs want this:
1648 #bh = self.get_bridgehead(vertex.site, vertex.part, transport,
1649 # local_vertex.is_black(), detect_failed)
1653 vertex.accept_red_red = []
1654 vertex.accept_black = []
1655 found_failed = False
1656 for t_guid, transport in self.transport_table.items():
1657 if transport.name != 'IP':
1658 #XXX well this is cheating a bit
1659 logging.warning("WARNING: we are ignoring a transport named %r"
1663 # FLAG_CR_NTDS_DOMAIN 0x00000002
1664 if ((vertex.is_red() and transport.name != "IP" and
1665 vertex.part.system_flags & 0x00000002)):
1668 if vertex not in graph.connected_vertices:
1671 partial_replica_okay = vertex.is_black()
1672 bh = self.get_bridgehead(vertex.site, vertex.part, transport,
1673 partial_replica_okay, detect_failed)
1678 vertex.accept_red_red.append(t_guid)
1679 vertex.accept_black.append(t_guid)
1681 # Add additional transport to allow another run of Dijkstra
1682 vertex.accept_red_red.append("EDGE_TYPE_ALL")
1683 vertex.accept_black.append("EDGE_TYPE_ALL")
1687 def create_connections(self, graph, part, detect_failed):
1688 """Construct an NC replica graph for the NC identified by
1689 the given crossRef, then create any additional nTDSConnection
1692 :param graph: site graph.
1693 :param part: crossRef object for NC.
1694 :param detect_failed: True to detect failed DCs and route
1695 replication traffic around them, False to assume no DC
1698 Modifies self.kept_connections by adding any connections
1699 deemed to be "in use".
1701 ::returns: (all_connected, found_failed_dc)
1702 (all_connected) True if the resulting NC replica graph
1703 connects all sites that need to be connected.
1704 (found_failed_dc) True if one or more failed DCs were
1707 all_connected = True
1708 found_failed = False
1710 logger.debug("create_connections(): enter\n"
1711 "\tpartdn=%s\n\tdetect_failed=%s" %
1712 (part.nc_dnstr, detect_failed))
1714 # XXX - This is a highly abbreviated function from the MS-TECH
1715 # ref. It creates connections between bridgeheads to all
1716 # sites that have appropriate replicas. Thus we are not
1717 # creating a minimum cost spanning tree but instead
1718 # producing a fully connected tree. This should produce
1719 # a full (albeit not optimal cost) replication topology.
1721 my_vertex = Vertex(self.my_site, part)
1722 my_vertex.color_vertex()
1724 for v in graph.vertices:
1726 if self.add_transports(v, my_vertex, graph, False):
1729 # No NC replicas for this NC in the site of the local DC,
1730 # so no nTDSConnection objects need be created
1731 if my_vertex.is_white():
1732 return all_connected, found_failed
1734 edge_list, n_components = get_spanning_tree_edges(graph,
1738 logger.debug("%s Number of components: %d" %
1739 (part.nc_dnstr, n_components))
1740 if n_components > 1:
1741 all_connected = False
1743 # LET partialReplicaOkay be TRUE if and only if
1744 # localSiteVertex.Color = COLOR.BLACK
1745 partial_ok = my_vertex.is_black()
1747 # Utilize the IP transport only for now
1748 transport = self.ip_transport
1750 DEBUG("edge_list %s" % edge_list)
1752 # XXX more accurate comparison?
1753 if e.directed and e.vertices[0].site is self.my_site:
1756 if e.vertices[0].site is self.my_site:
1757 rsite = e.vertices[1].site
1759 rsite = e.vertices[0].site
1761 # We don't make connections to our own site as that
1762 # is intrasite topology generator's job
1763 if rsite is self.my_site:
1764 DEBUG("rsite is my_site")
1767 # Determine bridgehead server in remote site
1768 rbh = self.get_bridgehead(rsite, part, transport,
1769 partial_ok, detect_failed)
1773 # RODC acts as an BH for itself
1775 # LET lbh be the nTDSDSA object of the local DC
1777 # LET lbh be the result of GetBridgeheadDC(localSiteVertex.ID,
1778 # cr, t, partialReplicaOkay, detectFailedDCs)
1779 if self.my_dsa.is_ro():
1780 lsite = self.my_site
1783 lsite = self.my_site
1784 lbh = self.get_bridgehead(lsite, part, transport,
1785 partial_ok, detect_failed)
1788 DEBUG_RED("DISASTER! lbh is None")
1793 DEBUG_BLUE("vertices")
1795 DEBUG_BLUE("bridgeheads")
1797 DEBUG_BLUE("-" * 70)
1799 sitelink = e.site_link
1800 if sitelink is None:
1804 link_opt = sitelink.options
1805 link_sched = sitelink.schedule
1807 self.create_connection(part, rbh, rsite, transport,
1808 lbh, lsite, link_opt, link_sched,
1809 partial_ok, detect_failed)
1811 return all_connected, found_failed
1813 def create_intersite_connections(self):
1814 """Computes an NC replica graph for each NC replica that "should be
1815 present" on the local DC or "is present" on any DC in the same site
1816 as the local DC. For each edge directed to an NC replica on such a
1817 DC from an NC replica on a DC in another site, the KCC creates an
1818 nTDSConnection object to imply that edge if one does not already
1821 Modifies self.kept_connections - A set of nTDSConnection
1822 objects for edges that are directed
1823 to the local DC's site in one or more NC replica graphs.
1825 returns: True if spanning trees were created for all NC replica
1826 graphs, otherwise False.
1828 all_connected = True
1829 self.kept_connections = set()
1831 # LET crossRefList be the set containing each object o of class
1832 # crossRef such that o is a child of the CN=Partitions child of the
1835 # FOR each crossRef object cr in crossRefList
1836 # IF cr!enabled has a value and is false, or if FLAG_CR_NTDS_NC
1837 # is clear in cr!systemFlags, skip cr.
1838 # LET g be the GRAPH return of SetupGraph()
1840 for part in self.part_table.values():
1842 if not part.is_enabled():
1845 if part.is_foreign():
1848 graph = self.setup_graph(part)
1850 # Create nTDSConnection objects, routing replication traffic
1851 # around "failed" DCs.
1852 found_failed = False
1854 connected, found_failed = self.create_connections(graph,
1857 DEBUG("with detect_failed: connected %s Found failed %s" %
1858 (connected, found_failed))
1860 all_connected = False
1863 # One or more failed DCs preclude use of the ideal NC
1864 # replica graph. Add connections for the ideal graph.
1865 self.create_connections(graph, part, False)
1867 return all_connected
1869 def intersite(self):
1870 """The head method for generating the inter-site KCC replica
1871 connection graph and attendant nTDSConnection objects
1874 Produces self.kept_connections set of NTDS Connections
1875 that should be kept during subsequent pruning process.
1877 ::return (True or False): (True) if the produced NC replica
1878 graph connects all sites that need to be connected
1883 mysite = self.my_site
1884 all_connected = True
1886 logger.debug("intersite(): enter")
1888 # Determine who is the ISTG
1890 mysite.select_istg(self.samdb, mydsa, ro=True)
1892 mysite.select_istg(self.samdb, mydsa, ro=False)
1894 # Test whether local site has topology disabled
1895 if mysite.is_intersite_topology_disabled():
1896 logger.debug("intersite(): exit disabled all_connected=%d" %
1898 return all_connected
1900 if not mydsa.is_istg():
1901 logger.debug("intersite(): exit not istg all_connected=%d" %
1903 return all_connected
1905 self.merge_failed_links()
1907 # For each NC with an NC replica that "should be present" on the
1908 # local DC or "is present" on any DC in the same site as the
1909 # local DC, the KCC constructs a site graph--a precursor to an NC
1910 # replica graph. The site connectivity for a site graph is defined
1911 # by objects of class interSiteTransport, siteLink, and
1912 # siteLinkBridge in the config NC.
1914 all_connected = self.create_intersite_connections()
1916 logger.debug("intersite(): exit all_connected=%d" % all_connected)
1917 return all_connected
1919 def update_rodc_connection(self):
1920 """Runs when the local DC is an RODC and updates the RODC NTFRS
1923 # Given an nTDSConnection object cn1, such that cn1.options contains
1924 # NTDSCONN_OPT_RODC_TOPOLOGY, and another nTDSConnection object cn2,
1925 # does not contain NTDSCONN_OPT_RODC_TOPOLOGY, modify cn1 to ensure
1926 # that the following is true:
1928 # cn1.fromServer = cn2.fromServer
1929 # cn1.schedule = cn2.schedule
1931 # If no such cn2 can be found, cn1 is not modified.
1932 # If no such cn1 can be found, nothing is modified by this task.
1934 if not self.my_dsa.is_ro():
1937 all_connections = self.my_dsa.connect_table.values()
1938 ro_connections = [x for x in all_connections if x.is_rodc_topology()]
1939 rw_connections = [x for x in all_connections
1940 if x not in ro_connections]
1942 # XXX here we are dealing with multiple RODC_TOPO connections,
1943 # if they exist. It is not clear whether the spec means that
1944 # or if it ever arises.
1945 if rw_connections and ro_connections:
1946 for con in ro_connections:
1947 cn2 = rw_connections[0]
1948 con.from_dnstr = cn2.from_dnstr
1949 con.schedule = cn2.schedule
1950 con.to_be_modified = True
1952 self.my_dsa.commit_connections(self.samdb, ro=opts.readonly)
1954 def intrasite_max_node_edges(self, node_count):
1955 """Returns the maximum number of edges directed to a node in
1956 the intrasite replica graph.
1958 The KCC does not create more
1959 than 50 edges directed to a single DC. To optimize replication,
1960 we compute that each node should have n+2 total edges directed
1961 to it such that (n) is the smallest non-negative integer
1962 satisfying (node_count <= 2*(n*n) + 6*n + 7)
1964 (If the number of edges is m (i.e. n + 2), that is the same as
1965 2 * m*m - 2 * m + 3).
1975 :param node_count: total number of nodes in the replica graph
1977 The intention is that there should be no more than 3 hops
1978 between any two DSAs at a site. With up to 7 nodes the 2 edges
1979 of the ring are enough; any configuration of extra edges with
1980 8 nodes will be enough. It is less clear that the 3 hop
1981 guarantee holds at e.g. 15 nodes in degenerate cases, but
1982 those are quite unlikely given the extra edges are randomly
1987 if node_count <= (2 * (n * n) + (6 * n) + 7):
1995 def construct_intrasite_graph(self, site_local, dc_local,
1996 nc_x, gc_only, detect_stale):
1998 # We're using the MS notation names here to allow
1999 # correlation back to the published algorithm.
2001 # nc_x - naming context (x) that we are testing if it
2002 # "should be present" on the local DC
2003 # f_of_x - replica (f) found on a DC (s) for NC (x)
2004 # dc_s - DC where f_of_x replica was found
2005 # dc_local - local DC that potentially needs a replica
2007 # r_list - replica list R
2008 # p_of_x - replica (p) is partial and found on a DC (s)
2010 # l_of_x - replica (l) is the local replica for NC (x)
2011 # that should appear on the local DC
2012 # r_len = is length of replica list |R|
2014 # If the DSA doesn't need a replica for this
2015 # partition (NC x) then continue
2016 needed, ro, partial = nc_x.should_be_present(dc_local)
2018 DEBUG_YELLOW("construct_intrasite_graph(): enter" +
2019 "\n\tgc_only=%d" % gc_only +
2020 "\n\tdetect_stale=%d" % detect_stale +
2021 "\n\tneeded=%s" % needed +
2023 "\n\tpartial=%s" % partial +
2027 DEBUG_RED("%s lacks 'should be present' status, "
2028 "aborting construct_intersite_graph!" %
2032 # Create a NCReplica that matches what the local replica
2033 # should say. We'll use this below in our r_list
2034 l_of_x = NCReplica(dc_local.dsa_dnstr, dc_local.dsa_guid,
2037 l_of_x.identify_by_basedn(self.samdb)
2039 l_of_x.rep_partial = partial
2042 # Add this replica that "should be present" to the
2043 # needed replica table for this DSA
2044 dc_local.add_needed_replica(l_of_x)
2048 # Let R be a sequence containing each writable replica f of x
2049 # such that f "is present" on a DC s satisfying the following
2052 # * s is a writable DC other than the local DC.
2054 # * s is in the same site as the local DC.
2056 # * If x is a read-only full replica and x is a domain NC,
2057 # then the DC's functional level is at least
2058 # DS_BEHAVIOR_WIN2008.
2060 # * Bit NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED is set
2061 # in the options attribute of the site settings object for
2062 # the local DC's site, or no tuple z exists in the
2063 # kCCFailedLinks or kCCFailedConnections variables such
2064 # that z.UUIDDsa is the objectGUID of the nTDSDSA object
2065 # for s, z.FailureCount > 0, and the current time -
2066 # z.TimeFirstFailure > 2 hours.
2070 # We'll loop thru all the DSAs looking for
2071 # writeable NC replicas that match the naming
2072 # context dn for (nc_x)
2074 for dc_s in self.my_site.dsa_table.values():
2075 # If this partition (nc_x) doesn't appear as a
2076 # replica (f_of_x) on (dc_s) then continue
2077 if not nc_x.nc_dnstr in dc_s.current_rep_table:
2080 # Pull out the NCReplica (f) of (x) with the dn
2081 # that matches NC (x) we are examining.
2082 f_of_x = dc_s.current_rep_table[nc_x.nc_dnstr]
2084 # Replica (f) of NC (x) must be writable
2088 # Replica (f) of NC (x) must satisfy the
2089 # "is present" criteria for DC (s) that
2091 if not f_of_x.is_present():
2094 # DC (s) must be a writable DSA other than
2095 # my local DC. In other words we'd only replicate
2096 # from other writable DC
2097 if dc_s.is_ro() or dc_s is dc_local:
2100 # Certain replica graphs are produced only
2101 # for global catalogs, so test against
2102 # method input parameter
2103 if gc_only and not dc_s.is_gc():
2106 # DC (s) must be in the same site as the local DC
2107 # as this is the intra-site algorithm. This is
2108 # handled by virtue of placing DSAs in per
2109 # site objects (see enclosing for() loop)
2111 # If NC (x) is intended to be read-only full replica
2112 # for a domain NC on the target DC then the source
2113 # DC should have functional level at minimum WIN2008
2115 # Effectively we're saying that in order to replicate
2116 # to a targeted RODC (which was introduced in Windows 2008)
2117 # then we have to replicate from a DC that is also minimally
2120 # You can also see this requirement in the MS special
2121 # considerations for RODC which state that to deploy
2122 # an RODC, at least one writable domain controller in
2123 # the domain must be running Windows Server 2008
2124 if ro and not partial and nc_x.nc_type == NCType.domain:
2125 if not dc_s.is_minimum_behavior(dsdb.DS_DOMAIN_FUNCTION_2008):
2128 # If we haven't been told to turn off stale connection
2129 # detection and this dsa has a stale connection then
2131 if detect_stale and self.is_stale_link_connection(dc_s):
2134 # Replica meets criteria. Add it to table indexed
2135 # by the GUID of the DC that it appears on
2136 r_list.append(f_of_x)
2138 # If a partial (not full) replica of NC (x) "should be present"
2139 # on the local DC, append to R each partial replica (p of x)
2140 # such that p "is present" on a DC satisfying the same
2141 # criteria defined above for full replica DCs.
2143 # XXX This loop and the previous one differ only in whether
2144 # the replica is partial or not. here we only accept partial
2145 # (because we're partial); before we only accepted full. Order
2146 # doen't matter (the list is sorted a few lines down) so these
2147 # loops could easily be merged. Or this could be a helper
2151 # Now we loop thru all the DSAs looking for
2152 # partial NC replicas that match the naming
2153 # context dn for (NC x)
2154 for dc_s in self.my_site.dsa_table.values():
2156 # If this partition NC (x) doesn't appear as a
2157 # replica (p) of NC (x) on the dsa DC (s) then
2159 if not nc_x.nc_dnstr in dc_s.current_rep_table:
2162 # Pull out the NCReplica with the dn that
2163 # matches NC (x) we are examining.
2164 p_of_x = dc_s.current_rep_table[nc_x.nc_dnstr]
2166 # Replica (p) of NC (x) must be partial
2167 if not p_of_x.is_partial():
2170 # Replica (p) of NC (x) must satisfy the
2171 # "is present" criteria for DC (s) that
2173 if not p_of_x.is_present():
2176 # DC (s) must be a writable DSA other than
2177 # my DSA. In other words we'd only replicate
2178 # from other writable DSA
2179 if dc_s.is_ro() or dc_s is dc_local:
2182 # Certain replica graphs are produced only
2183 # for global catalogs, so test against
2184 # method input parameter
2185 if gc_only and not dc_s.is_gc():
2188 # If we haven't been told to turn off stale connection
2189 # detection and this dsa has a stale connection then
2191 if detect_stale and self.is_stale_link_connection(dc_s):
2194 # Replica meets criteria. Add it to table indexed
2195 # by the GUID of the DSA that it appears on
2196 r_list.append(p_of_x)
2198 # Append to R the NC replica that "should be present"
2200 r_list.append(l_of_x)
2202 r_list.sort(sort_replica_by_dsa_guid)
2205 max_node_edges = self.intrasite_max_node_edges(r_len)
2207 # Add a node for each r_list element to the replica graph
2210 node = GraphNode(rep.rep_dsa_dnstr, max_node_edges)
2211 graph_list.append(node)
2213 # For each r(i) from (0 <= i < |R|-1)
2215 while i < (r_len-1):
2216 # Add an edge from r(i) to r(i+1) if r(i) is a full
2217 # replica or r(i+1) is a partial replica
2218 if not r_list[i].is_partial() or r_list[i+1].is_partial():
2219 graph_list[i+1].add_edge_from(r_list[i].rep_dsa_dnstr)
2221 # Add an edge from r(i+1) to r(i) if r(i+1) is a full
2222 # replica or ri is a partial replica.
2223 if not r_list[i+1].is_partial() or r_list[i].is_partial():
2224 graph_list[i].add_edge_from(r_list[i+1].rep_dsa_dnstr)
2227 # Add an edge from r|R|-1 to r0 if r|R|-1 is a full replica
2228 # or r0 is a partial replica.
2229 if not r_list[r_len-1].is_partial() or r_list[0].is_partial():
2230 graph_list[0].add_edge_from(r_list[r_len-1].rep_dsa_dnstr)
2232 # Add an edge from r0 to r|R|-1 if r0 is a full replica or
2233 # r|R|-1 is a partial replica.
2234 if not r_list[0].is_partial() or r_list[r_len-1].is_partial():
2235 graph_list[r_len-1].add_edge_from(r_list[0].rep_dsa_dnstr)
2237 DEBUG("r_list is length %s" % len(r_list))
2238 DEBUG('\n'.join(str((x.rep_dsa_guid, x.rep_dsa_dnstr))
2241 do_dot_files = opts.dot_files and opts.debug
2242 if opts.verify or do_dot_files:
2244 dot_vertices = set()
2245 for v1 in graph_list:
2246 dot_vertices.add(v1.dsa_dnstr)
2247 for v2 in v1.edge_from:
2248 dot_edges.append((v2, v1.dsa_dnstr))
2249 dot_vertices.add(v2)
2251 verify_properties = ('connected', 'directed_double_ring_or_small')
2252 verify_and_dot('intrasite_pre_ntdscon', dot_edges, dot_vertices,
2253 label='%s__%s__%s' % (site_local.site_dnstr,
2254 nctype_lut[nc_x.nc_type],
2256 properties=verify_properties, debug=DEBUG,
2258 dot_files=do_dot_files, directed=True)
2260 # For each existing nTDSConnection object implying an edge
2261 # from rj of R to ri such that j != i, an edge from rj to ri
2262 # is not already in the graph, and the total edges directed
2263 # to ri is less than n+2, the KCC adds that edge to the graph.
2264 for vertex in graph_list:
2265 dsa = self.my_site.dsa_table[vertex.dsa_dnstr]
2266 for connect in dsa.connect_table.values():
2267 remote = connect.from_dnstr
2268 if remote in self.my_site.dsa_table:
2269 vertex.add_edge_from(remote)
2271 DEBUG('reps are: %s' % ' '.join(x.rep_dsa_dnstr for x in r_list))
2272 DEBUG('dsas are: %s' % ' '.join(x.dsa_dnstr for x in graph_list))
2274 for tnode in graph_list:
2275 # To optimize replication latency in sites with many NC
2276 # replicas, the KCC adds new edges directed to ri to bring
2277 # the total edges to n+2, where the NC replica rk of R
2278 # from which the edge is directed is chosen at random such
2279 # that k != i and an edge from rk to ri is not already in
2282 # Note that the KCC tech ref does not give a number for
2283 # the definition of "sites with many NC replicas". At a
2284 # bare minimum to satisfy n+2 edges directed at a node we
2285 # have to have at least three replicas in |R| (i.e. if n
2286 # is zero then at least replicas from two other graph
2287 # nodes may direct edges to us).
2288 if r_len >= 3 and not tnode.has_sufficient_edges():
2289 candidates = [x for x in graph_list if
2291 x.dsa_dnstr not in tnode.edge_from)]
2293 DEBUG_BLUE("looking for random link for %s. r_len %d, "
2294 "graph len %d candidates %d"
2295 % (tnode.dsa_dnstr, r_len, len(graph_list),
2298 DEBUG("candidates %s" % [x.dsa_dnstr for x in candidates])
2300 while candidates and not tnode.has_sufficient_edges():
2301 other = random.choice(candidates)
2302 DEBUG("trying to add candidate %s" % other.dsa_dstr)
2303 if not tnode.add_edge_from(other):
2304 DEBUG_RED("could not add %s" % other.dsa_dstr)
2305 candidates.remove(other)
2307 DEBUG_FN("not adding links to %s: nodes %s, links is %s/%s" %
2308 (tnode.dsa_dnstr, r_len, len(tnode.edge_from),
2311 # Print the graph node in debug mode
2312 logger.debug("%s" % tnode)
2314 # For each edge directed to the local DC, ensure a nTDSConnection
2315 # points to us that satisfies the KCC criteria
2317 if tnode.dsa_dnstr == dc_local.dsa_dnstr:
2318 tnode.add_connections_from_edges(dc_local)
2320 if opts.verify or do_dot_files:
2322 dot_vertices = set()
2323 for v1 in graph_list:
2324 dot_vertices.add(v1.dsa_dnstr)
2325 for v2 in v1.edge_from:
2326 dot_edges.append((v2, v1.dsa_dnstr))
2327 dot_vertices.add(v2)
2329 verify_properties = ('connected', 'directed_double_ring_or_small')
2330 verify_and_dot('intrasite_post_ntdscon', dot_edges, dot_vertices,
2331 label='%s__%s__%s' % (site_local.site_dnstr,
2332 nctype_lut[nc_x.nc_type],
2334 properties=verify_properties, debug=DEBUG,
2336 dot_files=do_dot_files, directed=True)
2338 def intrasite(self):
2339 """The head method for generating the intra-site KCC replica
2340 connection graph and attendant nTDSConnection objects
2346 logger.debug("intrasite(): enter")
2348 # Test whether local site has topology disabled
2349 mysite = self.my_site
2350 if mysite.is_intrasite_topology_disabled():
2353 detect_stale = (not mysite.is_detect_stale_disabled())
2354 for connect in mydsa.connect_table.values():
2355 if connect.to_be_added:
2356 DEBUG_CYAN("TO BE ADDED:\n%s" % connect)
2358 # Loop thru all the partitions, with gc_only False
2359 for partdn, part in self.part_table.items():
2360 self.construct_intrasite_graph(mysite, mydsa, part, False,
2362 for connect in mydsa.connect_table.values():
2363 if connect.to_be_added:
2364 DEBUG_BLUE("TO BE ADDED:\n%s" % connect)
2366 # If the DC is a GC server, the KCC constructs an additional NC
2367 # replica graph (and creates nTDSConnection objects) for the
2368 # config NC as above, except that only NC replicas that "are present"
2369 # on GC servers are added to R.
2370 for connect in mydsa.connect_table.values():
2371 if connect.to_be_added:
2372 DEBUG_YELLOW("TO BE ADDED:\n%s" % connect)
2374 # Do it again, with gc_only True
2375 for partdn, part in self.part_table.items():
2376 if part.is_config():
2377 self.construct_intrasite_graph(mysite, mydsa, part, True,
2380 # The DC repeats the NC replica graph computation and nTDSConnection
2381 # creation for each of the NC replica graphs, this time assuming
2382 # that no DC has failed. It does so by re-executing the steps as
2383 # if the bit NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED were
2384 # set in the options attribute of the site settings object for
2385 # the local DC's site. (ie. we set "detec_stale" flag to False)
2386 for connect in mydsa.connect_table.values():
2387 if connect.to_be_added:
2388 DEBUG_BLUE("TO BE ADDED:\n%s" % connect)
2390 # Loop thru all the partitions.
2391 for partdn, part in self.part_table.items():
2392 self.construct_intrasite_graph(mysite, mydsa, part, False,
2393 False) # don't detect stale
2395 # If the DC is a GC server, the KCC constructs an additional NC
2396 # replica graph (and creates nTDSConnection objects) for the
2397 # config NC as above, except that only NC replicas that "are present"
2398 # on GC servers are added to R.
2399 for connect in mydsa.connect_table.values():
2400 if connect.to_be_added:
2401 DEBUG_RED("TO BE ADDED:\n%s" % connect)
2403 for partdn, part in self.part_table.items():
2404 if part.is_config():
2405 self.construct_intrasite_graph(mysite, mydsa, part, True,
2406 False) # don't detect stale
2409 # Display any to be added or modified repsFrom
2410 for connect in mydsa.connect_table.values():
2411 if connect.to_be_deleted:
2412 logger.info("TO BE DELETED:\n%s" % connect)
2413 if connect.to_be_modified:
2414 logger.info("TO BE MODIFIED:\n%s" % connect)
2415 if connect.to_be_added:
2416 DEBUG_GREEN("TO BE ADDED:\n%s" % connect)
2418 mydsa.commit_connections(self.samdb, ro=True)
2420 # Commit any newly created connections to the samdb
2421 mydsa.commit_connections(self.samdb)
2423 def list_dsas(self):
2427 self.load_all_sites()
2428 self.load_all_partitions()
2429 self.load_all_transports()
2430 self.load_all_sitelinks()
2432 for site in self.site_table.values():
2433 dsas.extend([dsa.dsa_dnstr.replace('CN=NTDS Settings,', '', 1)
2434 for dsa in site.dsa_table.values()])
2437 def load_samdb(self, dburl, lp, creds):
2438 self.samdb = SamDB(url=dburl,
2439 session_info=system_session(),
2440 credentials=creds, lp=lp)
2442 def plot_all_connections(self, basename, verify_properties=()):
2443 verify = verify_properties and opts.verify
2444 plot = opts.dot_files
2445 if not (verify or plot):
2453 for dsa in self.dsa_by_dnstr.values():
2454 dot_vertices.append(dsa.dsa_dnstr)
2456 vertex_colours.append('#cc0000')
2458 vertex_colours.append('#0000cc')
2459 for con in dsa.connect_table.values():
2460 if con.is_rodc_topology():
2461 edge_colours.append('red')
2463 edge_colours.append('blue')
2464 dot_edges.append((con.from_dnstr, dsa.dsa_dnstr))
2466 verify_and_dot(basename, dot_edges, vertices=dot_vertices,
2467 label=self.my_dsa_dnstr, properties=verify_properties,
2468 debug=DEBUG, verify=verify, dot_files=plot,
2469 directed=True, edge_colors=edge_colours,
2470 vertex_colors=vertex_colours)
2472 def run(self, dburl, lp, creds, forced_local_dsa=None,
2473 forget_local_links=False, forget_intersite_links=False):
2474 """Method to perform a complete run of the KCC and
2475 produce an updated topology for subsequent NC replica
2476 syncronization between domain controllers
2478 # We may already have a samdb setup if we are
2479 # currently importing an ldif for a test run
2480 if self.samdb is None:
2482 self.load_samdb(dburl, lp, creds)
2483 except ldb.LdbError, (num, msg):
2484 logger.error("Unable to open sam database %s : %s" %
2488 if forced_local_dsa:
2489 self.samdb.set_ntds_settings_dn("CN=NTDS Settings,%s" %
2497 self.load_all_sites()
2498 self.load_all_partitions()
2499 self.load_all_transports()
2500 self.load_all_sitelinks()
2502 if opts.verify or opts.dot_files:
2504 for site in self.site_table.values():
2505 guid_to_dnstr.update((str(dsa.dsa_guid), dnstr)
2507 in site.dsa_table.items())
2509 self.plot_all_connections('dsa_initial')
2512 current_reps, needed_reps = self.my_dsa.get_rep_tables()
2513 for dnstr, c_rep in current_reps.items():
2514 DEBUG("c_rep %s" % c_rep)
2515 dot_edges.append((self.my_dsa.dsa_dnstr, dnstr))
2517 verify_and_dot('dsa_repsFrom_initial', dot_edges,
2518 directed=True, label=self.my_dsa_dnstr,
2519 properties=(), debug=DEBUG, verify=opts.verify,
2520 dot_files=opts.dot_files)
2523 for site in self.site_table.values():
2524 for dsa in site.dsa_table.values():
2525 current_reps, needed_reps = dsa.get_rep_tables()
2526 for dn_str, rep in current_reps.items():
2527 for reps_from in rep.rep_repsFrom:
2528 DEBUG("rep %s" % rep)
2529 dsa_guid = str(reps_from.source_dsa_obj_guid)
2530 dsa_dn = guid_to_dnstr[dsa_guid]
2531 dot_edges.append((dsa.dsa_dnstr, dsa_dn))
2533 verify_and_dot('dsa_repsFrom_initial_all', dot_edges,
2534 directed=True, label=self.my_dsa_dnstr,
2535 properties=(), debug=DEBUG, verify=opts.verify,
2536 dot_files=opts.dot_files)
2539 for link in self.sitelink_table.values():
2540 for a, b in itertools.combinations(link.site_list, 2):
2541 dot_edges.append((str(a), str(b)))
2542 properties = ('connected',)
2543 verify_and_dot('dsa_sitelink_initial', dot_edges,
2545 label=self.my_dsa_dnstr, properties=properties,
2546 debug=DEBUG, verify=opts.verify,
2547 dot_files=opts.dot_files)
2549 if forget_local_links:
2550 for dsa in self.my_site.dsa_table.values():
2551 dsa.connect_table = {k: v for k, v in
2552 dsa.connect_table.items()
2553 if v.is_rodc_topology()}
2554 self.plot_all_connections('dsa_forgotten_local')
2556 if forget_intersite_links:
2557 for site in self.site_table.values():
2558 for dsa in site.dsa_table.values():
2559 dsa.connect_table = {k: v for k, v in
2560 dsa.connect_table.items()
2561 if site is self.my_site and
2562 v.is_rodc_topology()}
2564 self.plot_all_connections('dsa_forgotten_all')
2565 # These are the published steps (in order) for the
2566 # MS-TECH description of the KCC algorithm ([MS-ADTS] 6.2.2)
2569 self.refresh_failed_links_connections()
2575 all_connected = self.intersite()
2578 self.remove_unneeded_ntdsconn(all_connected)
2581 self.translate_ntdsconn()
2584 self.remove_unneeded_failed_links_connections()
2587 self.update_rodc_connection()
2589 if opts.verify or opts.dot_files:
2590 self.plot_all_connections('dsa_final',
2591 ('connected', 'forest_of_rings'))
2593 DEBUG_MAGENTA("there are %d dsa guids" % len(guid_to_dnstr))
2597 my_dnstr = self.my_dsa.dsa_dnstr
2598 current_reps, needed_reps = self.my_dsa.get_rep_tables()
2599 for dnstr, n_rep in needed_reps.items():
2600 for reps_from in n_rep.rep_repsFrom:
2601 guid_str = str(reps_from.source_dsa_obj_guid)
2602 dot_edges.append((my_dnstr, guid_to_dnstr[guid_str]))
2603 edge_colors.append('#' + str(n_rep.nc_guid)[:6])
2605 verify_and_dot('dsa_repsFrom_final', dot_edges, directed=True,
2606 label=self.my_dsa_dnstr,
2607 properties=(), debug=DEBUG, verify=opts.verify,
2608 dot_files=opts.dot_files,
2609 edge_colors=edge_colors)
2613 for site in self.site_table.values():
2614 for dsa in site.dsa_table.values():
2615 current_reps, needed_reps = dsa.get_rep_tables()
2616 for n_rep in needed_reps.values():
2617 for reps_from in n_rep.rep_repsFrom:
2618 dsa_guid = str(reps_from.source_dsa_obj_guid)
2619 dsa_dn = guid_to_dnstr[dsa_guid]
2620 dot_edges.append((dsa.dsa_dnstr, dsa_dn))
2622 verify_and_dot('dsa_repsFrom_final_all', dot_edges,
2623 directed=True, label=self.my_dsa_dnstr,
2624 properties=(), debug=DEBUG, verify=opts.verify,
2625 dot_files=opts.dot_files)
2632 def import_ldif(self, dburl, lp, creds, ldif_file):
2633 """Import all objects and attributes that are relevent
2634 to the KCC algorithms from a previously exported LDIF file.
2636 The point of this function is to allow a programmer/debugger to
2637 import an LDIF file with non-security relevent information that
2638 was previously extracted from a DC database. The LDIF file is used
2639 to create a temporary abbreviated database. The KCC algorithm can
2640 then run against this abbreviated database for debug or test
2641 verification that the topology generated is computationally the
2642 same between different OSes and algorithms.
2644 :param dburl: path to the temporary abbreviated db to create
2645 :param ldif_file: path to the ldif file to import
2648 self.samdb = ldif_utils.ldif_to_samdb(dburl, lp, ldif_file,
2649 opts.forced_local_dsa)
2650 except ldif_utils.LdifError, e:
2655 def export_ldif(self, dburl, lp, creds, ldif_file):
2656 """Routine to extract all objects and attributes that are relevent
2657 to the KCC algorithms from a DC database.
2659 The point of this function is to allow a programmer/debugger to
2660 extract an LDIF file with non-security relevent information from
2661 a DC database. The LDIF file can then be used to "import" via
2662 the import_ldif() function this file into a temporary abbreviated
2663 database. The KCC algorithm can then run against this abbreviated
2664 database for debug or test verification that the topology generated
2665 is computationally the same between different OSes and algorithms.
2667 :param dburl: LDAP database URL to extract info from
2668 :param ldif_file: output LDIF file name to create
2671 ldif_utils.samdb_to_ldif_file(self.samdb, dburl, lp, creds,
2673 except ldif_utils.LdifError, e:
2678 ##################################################
2680 ##################################################
2683 def get_spanning_tree_edges(graph, my_site, label=None):
2684 # Phase 1: Run Dijkstra's to get a list of internal edges, which are
2685 # just the shortest-paths connecting colored vertices
2687 internal_edges = set()
2689 for e_set in graph.edge_set:
2691 for v in graph.vertices:
2694 # All con_type in an edge set is the same
2695 for e in e_set.edges:
2696 edgeType = e.con_type
2697 for v in e.vertices:
2700 if opts.verify or opts.dot_files:
2701 graph_edges = [(a.site.site_dnstr, b.site.site_dnstr)
2704 *(itertools.combinations(edge.vertices, 2)
2705 for edge in e_set.edges))]
2706 graph_nodes = [v.site.site_dnstr for v in graph.vertices]
2708 if opts.dot_files and opts.debug:
2709 write_dot_file('edgeset_%s' % (edgeType,), graph_edges,
2710 vertices=graph_nodes, label=label)
2713 verify_graph('spanning tree edge set %s' % edgeType,
2714 graph_edges, vertices=graph_nodes,
2715 properties=('complete', 'connected'),
2718 # Run dijkstra's algorithm with just the red vertices as seeds
2719 # Seed from the full replicas
2720 dijkstra(graph, edgeType, False)
2723 process_edge_set(graph, e_set, internal_edges)
2725 # Run dijkstra's algorithm with red and black vertices as the seeds
2726 # Seed from both full and partial replicas
2727 dijkstra(graph, edgeType, True)
2730 process_edge_set(graph, e_set, internal_edges)
2732 # All vertices have root/component as itself
2733 setup_vertices(graph)
2734 process_edge_set(graph, None, internal_edges)
2736 if opts.verify or opts.dot_files:
2737 graph_edges = [(e.v1.site.site_dnstr, e.v2.site.site_dnstr)
2738 for e in internal_edges]
2739 graph_nodes = [v.site.site_dnstr for v in graph.vertices]
2740 verify_properties = ('multi_edge_forest',)
2741 verify_and_dot('prekruskal', graph_edges, graph_nodes, label=label,
2742 properties=verify_properties, debug=DEBUG,
2744 dot_files=opts.dot_files)
2746 # Phase 2: Run Kruskal's on the internal edges
2747 output_edges, components = kruskal(graph, internal_edges)
2749 # This recalculates the cost for the path connecting the
2750 # closest red vertex. Ignoring types is fine because NO
2751 # suboptimal edge should exist in the graph
2752 dijkstra(graph, "EDGE_TYPE_ALL", False) # TODO rename
2753 # Phase 3: Process the output
2754 for v in graph.vertices:
2758 v.dist_to_red = v.repl_info.cost
2760 if opts.verify or opts.dot_files:
2761 graph_edges = [(e.v1.site.site_dnstr, e.v2.site.site_dnstr)
2762 for e in internal_edges]
2763 graph_nodes = [v.site.site_dnstr for v in graph.vertices]
2764 verify_properties = ('multi_edge_forest',)
2765 verify_and_dot('postkruskal', graph_edges, graph_nodes,
2766 label=label, properties=verify_properties,
2767 debug=DEBUG, verify=opts.verify,
2768 dot_files=opts.dot_files)
2770 # Ensure only one-way connections for partial-replicas,
2771 # and make sure they point the right way.
2773 for edge in output_edges:
2774 # We know these edges only have two endpoints because we made
2776 v, w = edge.vertices
2777 if v.site is my_site or w.site is my_site:
2778 if (((v.is_black() or w.is_black()) and
2779 v.dist_to_red != MAX_DWORD)):
2780 edge.directed = True
2782 if w.dist_to_red < v.dist_to_red:
2783 edge.vertices[:] = w, v
2784 edge_list.append(edge)
2786 if opts.verify or opts.dot_files:
2787 graph_edges = [[x.site.site_dnstr for x in e.vertices]
2789 #add the reverse edge if not directed.
2790 graph_edges.extend([x.site.site_dnstr
2791 for x in reversed(e.vertices)]
2792 for e in edge_list if not e.directed)
2793 graph_nodes = [x.site.site_dnstr for x in graph.vertices]
2794 verify_properties = ()
2795 verify_and_dot('post-one-way-partial', graph_edges, graph_nodes,
2796 label=label, properties=verify_properties,
2797 debug=DEBUG, verify=opts.verify,
2799 dot_files=opts.dot_files)
2801 # count the components
2802 return edge_list, components
2805 def sort_replica_by_dsa_guid(rep1, rep2):
2806 """Helper to sort NCReplicas by their DSA guids
2808 The guids need to be sorted in their NDR form.
2810 :param rep1: An NC replica
2811 :param rep2: Another replica
2812 :return: -1, 0, or 1, indicating sort order.
2814 return cmp(ndr_pack(rep1.rep_dsa_guid), ndr_pack(rep2.rep_dsa_guid))
2817 def sort_dsa_by_gc_and_guid(dsa1, dsa2):
2818 """Helper to sort DSAs by guid global catalog status
2820 GC DSAs come before non-GC DSAs, other than that, the guids are
2823 :param dsa1: A DSA object
2824 :param dsa2: Another DSA
2825 :return: -1, 0, or 1, indicating sort order.
2827 if dsa1.is_gc() and not dsa2.is_gc():
2829 if not dsa1.is_gc() and dsa2.is_gc():
2831 return cmp(ndr_pack(dsa1.dsa_guid), ndr_pack(dsa2.dsa_guid))
2834 def is_smtp_replication_available():
2835 """Can the KCC use SMTP replication?
2837 Currently always returns false because Samba doesn't implement
2838 SMTP transfer for NC changes between DCs.
2840 :return: Boolean (always False)
2845 def create_edge(con_type, site_link, guid_to_vertex):
2847 e.site_link = site_link
2849 for site_guid in site_link.site_list:
2850 if str(site_guid) in guid_to_vertex:
2851 e.vertices.extend(guid_to_vertex.get(str(site_guid)))
2852 e.repl_info.cost = site_link.cost
2853 e.repl_info.options = site_link.options
2854 e.repl_info.interval = site_link.interval
2855 e.repl_info.schedule = convert_schedule_to_repltimes(site_link.schedule)
2856 e.con_type = con_type
2861 def create_auto_edge_set(graph, transport):
2862 e_set = MultiEdgeSet()
2863 # use a NULL guid, not associated with a SiteLinkBridge object
2864 e_set.guid = misc.GUID()
2865 for site_link in graph.edges:
2866 if site_link.con_type == transport:
2867 e_set.edges.append(site_link)
2872 def create_edge_set(graph, transport, site_link_bridge):
2873 # TODO not implemented - need to store all site link bridges
2874 e_set = MultiEdgeSet()
2875 # e_set.guid = site_link_bridge
2879 def setup_vertices(graph):
2880 for v in graph.vertices:
2882 v.repl_info.cost = MAX_DWORD
2884 v.component_id = None
2886 v.repl_info.cost = 0
2890 v.repl_info.interval = 0
2891 v.repl_info.options = 0xFFFFFFFF
2892 v.repl_info.schedule = None # TODO highly suspicious
2896 def dijkstra(graph, edge_type, include_black):
2898 setup_dijkstra(graph, edge_type, include_black, queue)
2899 while len(queue) > 0:
2900 cost, guid, vertex = heapq.heappop(queue)
2901 for edge in vertex.edges:
2902 for v in edge.vertices:
2904 # add new path from vertex to v
2905 try_new_path(graph, queue, vertex, edge, v)
2908 def setup_dijkstra(graph, edge_type, include_black, queue):
2909 setup_vertices(graph)
2910 for vertex in graph.vertices:
2911 if vertex.is_white():
2914 if (((vertex.is_black() and not include_black)
2915 or edge_type not in vertex.accept_black
2916 or edge_type not in vertex.accept_red_red)):
2917 vertex.repl_info.cost = MAX_DWORD
2918 vertex.root = None # NULL GUID
2919 vertex.demoted = True # Demoted appears not to be used
2921 heapq.heappush(queue, (vertex.repl_info.cost, vertex.guid, vertex))
2924 def try_new_path(graph, queue, vfrom, edge, vto):
2926 # What this function checks is that there is a valid time frame for
2927 # which replication can actually occur, despite being adequately
2929 intersect = combine_repl_info(vfrom.repl_info, edge.repl_info, newRI)
2931 # If the new path costs more than the current, then ignore the edge
2932 if newRI.cost > vto.repl_info.cost:
2935 if newRI.cost < vto.repl_info.cost and not intersect:
2938 new_duration = total_schedule(newRI.schedule)
2939 old_duration = total_schedule(vto.repl_info.schedule)
2941 # Cheaper or longer schedule
2942 if newRI.cost < vto.repl_info.cost or new_duration > old_duration:
2943 vto.root = vfrom.root
2944 vto.component_id = vfrom.component_id
2945 vto.repl_info = newRI
2946 heapq.heappush(queue, (vto.repl_info.cost, vto.guid, vto))
2949 def check_demote_vertex(vertex, edge_type):
2950 if vertex.is_white():
2953 # Accepts neither red-red nor black edges, demote
2954 if ((edge_type not in vertex.accept_black and
2955 edge_type not in vertex.accept_red_red)):
2956 vertex.repl_info.cost = MAX_DWORD
2958 vertex.demoted = True # Demoted appears not to be used
2961 def undemote_vertex(vertex):
2962 if vertex.is_white():
2965 vertex.repl_info.cost = 0
2966 vertex.root = vertex
2967 vertex.demoted = False
2970 def process_edge_set(graph, e_set, internal_edges):
2972 for edge in graph.edges:
2973 for vertex in edge.vertices:
2974 check_demote_vertex(vertex, edge.con_type)
2975 process_edge(graph, edge, internal_edges)
2976 for vertex in edge.vertices:
2977 undemote_vertex(vertex)
2979 for edge in e_set.edges:
2980 process_edge(graph, edge, internal_edges)
2983 def process_edge(graph, examine, internal_edges):
2984 # Find the set of all vertices touches the edge to examine
2986 for v in examine.vertices:
2987 # Append a 4-tuple of color, repl cost, guid and vertex
2988 vertices.append((v.color, v.repl_info.cost, v.ndrpacked_guid, v))
2989 # Sort by color, lower
2990 DEBUG("vertices is %s" % vertices)
2993 color, cost, guid, bestv = vertices[0]
2994 # Add to internal edges an edge from every colored vertex to bestV
2995 for v in examine.vertices:
2996 if v.component_id is None or v.root is None:
2999 # Only add edge if valid inter-tree edge - needs a root and
3000 # different components
3001 if ((bestv.component_id is not None and
3002 bestv.root is not None and
3003 v.component_id is not None and
3004 v.root is not None and
3005 bestv.component_id != v.component_id)):
3006 add_int_edge(graph, internal_edges, examine, bestv, v)
3009 # Add internal edge, endpoints are roots of the vertices to pass in
3010 # and are always colored
3011 def add_int_edge(graph, internal_edges, examine, v1, v2):
3016 if root1.is_red() and root2.is_red():
3020 if ((examine.con_type not in root1.accept_red_red
3021 or examine.con_type not in root2.accept_red_red)):
3023 elif (examine.con_type not in root1.accept_black
3024 or examine.con_type not in root2.accept_black):
3030 # Create the transitive replInfo for the two trees and this edge
3031 if not combine_repl_info(v1.repl_info, v2.repl_info, ri):
3033 # ri is now initialized
3034 if not combine_repl_info(ri, examine.repl_info, ri2):
3037 newIntEdge = InternalEdge(root1, root2, red_red, ri2, examine.con_type,
3039 # Order by vertex guid
3040 #XXX guid comparison using ndr_pack
3041 if newIntEdge.v1.ndrpacked_guid > newIntEdge.v2.ndrpacked_guid:
3042 newIntEdge.v1 = root2
3043 newIntEdge.v2 = root1
3045 internal_edges.add(newIntEdge)
3048 def kruskal(graph, edges):
3049 for v in graph.vertices:
3052 components = set([x for x in graph.vertices if not x.is_white()])
3055 # Sorted based on internal comparison function of internal edge
3058 #XXX expected_num_tree_edges is never used
3059 expected_num_tree_edges = 0 # TODO this value makes little sense
3064 while index < len(edges): # TODO and num_components > 1
3066 parent1 = find_component(e.v1)
3067 parent2 = find_component(e.v2)
3068 if parent1 is not parent2:
3070 add_out_edge(graph, output_edges, e)
3071 parent1.component_id = parent2
3072 components.discard(parent1)
3076 return output_edges, len(components)
3079 def find_component(vertex):
3080 if vertex.component_id is vertex:
3084 while current.component_id is not current:
3085 current = current.component_id
3089 while current.component_id is not root:
3090 n = current.component_id
3091 current.component_id = root
3097 def add_out_edge(graph, output_edges, e):
3101 # This multi-edge is a 'real' edge with no GUID
3104 ee.site_link = e.site_link
3105 ee.vertices.append(v1)
3106 ee.vertices.append(v2)
3107 ee.con_type = e.e_type
3108 ee.repl_info = e.repl_info
3109 output_edges.append(ee)
3115 def test_all_reps_from(lp, creds, rng_seed=None):
3117 kcc.load_samdb(opts.dburl, lp, creds)
3118 dsas = kcc.list_dsas()
3123 for site in kcc.site_table.values():
3124 guid_to_dnstr.update((str(dsa.dsa_guid), dnstr)
3125 for dnstr, dsa in site.dsa_table.items())
3134 random.seed(rng_seed)
3136 kcc.run(opts.dburl, lp, creds, forced_local_dsa=dsa_dn,
3137 forget_local_links=opts.forget_local_links,
3138 forget_intersite_links=opts.forget_intersite_links)
3140 current, needed = kcc.my_dsa.get_rep_tables()
3142 for dsa in kcc.my_site.dsa_table.values():
3143 if dsa is kcc.my_dsa:
3145 kcc.translate_ntdsconn(dsa)
3146 c, n = dsa.get_rep_tables()
3150 for name, rep_table, rep_parts in (
3151 ('needed', needed, needed_parts),
3152 ('current', current, current_parts)):
3153 for part, nc_rep in rep_table.items():
3154 edges = rep_parts.setdefault(part, [])
3155 for reps_from in nc_rep.rep_repsFrom:
3156 source = guid_to_dnstr[str(reps_from.source_dsa_obj_guid)]
3157 dest = guid_to_dnstr[str(nc_rep.rep_dsa_guid)]
3158 edges.append((source, dest))
3160 for site in kcc.site_table.values():
3161 for dsa in site.dsa_table.values():
3163 vertex_colours.append('#cc0000')
3165 vertex_colours.append('#0000cc')
3166 dot_vertices.append(dsa.dsa_dnstr)
3167 if dsa.connect_table:
3168 DEBUG_FN("DSA %s %s connections:\n%s" %
3169 (dsa.dsa_dnstr, len(dsa.connect_table),
3170 [x.from_dnstr for x in
3171 dsa.connect_table.values()]))
3172 for con in dsa.connect_table.values():
3173 if con.is_rodc_topology():
3174 colours.append('red')
3176 colours.append('blue')
3177 dot_edges.append((con.from_dnstr, dsa.dsa_dnstr))
3179 verify_and_dot('all-dsa-connections', dot_edges, vertices=dot_vertices,
3180 label="all dsa NTDSConnections", properties=(),
3181 debug=DEBUG, verify=opts.verify, dot_files=opts.dot_files,
3182 directed=True, edge_colors=colours,
3183 vertex_colors=vertex_colours)
3185 for name, rep_parts in (('needed', needed_parts),
3186 ('current', current_parts)):
3187 for part, edges in rep_parts.items():
3188 verify_and_dot('all-repsFrom_%s__%s' % (name, part), edges,
3189 directed=True, label=part,
3190 properties=(), debug=DEBUG, verify=opts.verify,
3191 dot_files=opts.dot_files)
3194 logger = logging.getLogger("samba_kcc")
3195 logger.addHandler(logging.StreamHandler(sys.stdout))
3196 DEBUG = logger.debug
3199 def _color_debug(*args, **kwargs):
3200 DEBUG('%s%s%s' % (kwargs['color'], args[0], C_NORMAL), *args[1:])
3202 _globals = globals()
3203 for _color in ('DARK_RED', 'RED', 'DARK_GREEN', 'GREEN', 'YELLOW',
3204 'DARK_YELLOW', 'DARK_BLUE', 'BLUE', 'PURPLE', 'MAGENTA',
3205 'DARK_CYAN', 'CYAN', 'GREY', 'WHITE', 'REV_RED'):
3206 _globals['DEBUG_' + _color] = partial(_color_debug, color=_globals[_color])
3209 def DEBUG_FN(msg=''):
3211 filename, lineno, function, text = traceback.extract_stack(None, 2)[0]
3212 DEBUG("%s%s:%s%s %s%s()%s '%s'" % (CYAN, filename, BLUE, lineno,
3213 CYAN, function, C_NORMAL, msg))
3216 ##################################################
3217 # samba_kcc entry point
3218 ##################################################
3220 parser = optparse.OptionParser("samba_kcc [options]")
3221 sambaopts = options.SambaOptions(parser)
3222 credopts = options.CredentialsOptions(parser)
3224 parser.add_option_group(sambaopts)
3225 parser.add_option_group(credopts)
3226 parser.add_option_group(options.VersionOptions(parser))
3228 parser.add_option("--readonly", default=False,
3229 help="compute topology but do not update database",
3230 action="store_true")
3232 parser.add_option("--debug",
3233 help="debug output",
3234 action="store_true")
3236 parser.add_option("--verify",
3237 help="verify that assorted invariants are kept",
3238 action="store_true")
3240 parser.add_option("--list-verify-tests",
3241 help=("list what verification actions are available "
3242 "and do nothing else"),
3243 action="store_true")
3245 parser.add_option("--no-dot-files", dest='dot_files',
3246 help="Don't write dot graph files in /tmp",
3247 default=True, action="store_false")
3249 parser.add_option("--seed",
3250 help="random number seed",
3253 parser.add_option("--importldif",
3254 help="import topology ldif file",
3255 type=str, metavar="<file>")
3257 parser.add_option("--exportldif",
3258 help="export topology ldif file",
3259 type=str, metavar="<file>")
3261 parser.add_option("-H", "--URL",
3262 help="LDB URL for database or target server",
3263 type=str, metavar="<URL>", dest="dburl")
3265 parser.add_option("--tmpdb",
3266 help="schemaless database file to create for ldif import",
3267 type=str, metavar="<file>")
3269 parser.add_option("--now",
3270 help=("assume current time is this ('YYYYmmddHHMMSS[tz]',"
3271 " default: system time)"),
3272 type=str, metavar="<date>")
3274 parser.add_option("--forced-local-dsa",
3275 help="run calculations assuming the DSA is this DN",
3276 type=str, metavar="<DSA>")
3278 parser.add_option("--attempt-live-connections", default=False,
3279 help="Attempt to connect to other DSAs to test links",
3280 action="store_true")
3282 parser.add_option("--list-valid-dsas", default=False,
3283 help=("Print a list of DSA dnstrs that could be"
3284 " used in --forced-local-dsa"),
3285 action="store_true")
3287 parser.add_option("--test-all-reps-from", default=False,
3288 help="Create and verify a graph of reps-from for every DSA",
3289 action="store_true")
3291 parser.add_option("--forget-local-links", default=False,
3292 help="pretend not to know the existing local topology",
3293 action="store_true")
3295 parser.add_option("--forget-intersite-links", default=False,
3296 help="pretend not to know the existing intersite topology",
3297 action="store_true")
3300 opts, args = parser.parse_args()
3303 if opts.list_verify_tests:
3308 logger.setLevel(logging.DEBUG)
3310 logger.setLevel(logging.INFO)
3312 logger.setLevel(logging.WARNING)
3314 # initialize seed from optional input parameter
3316 random.seed(opts.seed)
3318 random.seed(0xACE5CA11)
3321 for timeformat in ("%Y%m%d%H%M%S%Z", "%Y%m%d%H%M%S"):
3323 now_tuple = time.strptime(opts.now, timeformat)
3328 # else happens if break doesn't --> no match
3329 print >> sys.stderr, "could not parse time '%s'" % opts.now
3332 unix_now = int(time.mktime(now_tuple))
3334 unix_now = int(time.time())
3336 nt_now = unix2nttime(unix_now)
3338 lp = sambaopts.get_loadparm()
3339 creds = credopts.get_credentials(lp, fallback_machine=True)
3341 if opts.dburl is None:
3342 opts.dburl = lp.samdb_url()
3344 if opts.test_all_reps_from:
3345 opts.readonly = True
3346 rng_seed = opts.seed or 0xACE5CA11
3347 test_all_reps_from(lp, creds, rng_seed=rng_seed)
3350 # Instantiate Knowledge Consistency Checker and perform run
3354 rc = kcc.export_ldif(opts.dburl, lp, creds, opts.exportldif)
3358 if opts.tmpdb is None or opts.tmpdb.startswith('ldap'):
3359 logger.error("Specify a target temp database file with --tmpdb option")
3362 rc = kcc.import_ldif(opts.tmpdb, lp, creds, opts.importldif)
3366 if opts.list_valid_dsas:
3367 kcc.load_samdb(opts.dburl, lp, creds)
3368 print '\n'.join(kcc.list_dsas())
3372 rc = kcc.run(opts.dburl, lp, creds, opts.forced_local_dsa,
3373 opts.forget_local_links, opts.forget_intersite_links)
3376 except GraphError, e: