summaryrefslogtreecommitdiffstats
path: root/src/lib/Bcfg2/Server/Plugins/Metadata.py
blob: df98e6ea899f57204f3bb30f961c2b457f8f30ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
""" This file stores persistent metadata for the Bcfg2 Configuration
Repository. """

import re
import os
import sys
import time
import copy
import errno
import fcntl
import socket
import logging
import lxml.etree
import Bcfg2.Server
import Bcfg2.Server.Lint
import Bcfg2.Server.Plugin
import Bcfg2.Server.FileMonitor
from Bcfg2.Utils import locked
from Bcfg2.Compat import MutableMapping, all, wraps  # pylint: disable=W0622
from Bcfg2.version import Bcfg2VersionInfo

try:
    from django.db import models
    HAS_DJANGO = True
except ImportError:
    HAS_DJANGO = False

LOGGER = logging.getLogger(__name__)


if HAS_DJANGO:
    class MetadataClientModel(models.Model,
                              Bcfg2.Server.Plugin.PluginDatabaseModel):
        """ django model for storing clients in the database """
        hostname = models.CharField(max_length=255, primary_key=True)
        version = models.CharField(max_length=31, null=True)

    class ClientVersions(MutableMapping,
                         Bcfg2.Server.Plugin.DatabaseBacked):
        """ dict-like object to make it easier to access client bcfg2
        versions from the database """

        def __getitem__(self, key):
            try:
                return MetadataClientModel.objects.get(hostname=key).version
            except MetadataClientModel.DoesNotExist:
                raise KeyError(key)

        @Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
        def __setitem__(self, key, value):
            client, created = \
                MetadataClientModel.objects.get_or_create(hostname=key)
            if created or client.version != value:
                client.version = value
                client.save()

        @Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
        def __delitem__(self, key):
            # UserDict didn't require __delitem__, but MutableMapping
            # does.  we don't want deleting a client version record to
            # delete the client, so we just set the version to None,
            # which is kinda like deleting it, but not really.
            try:
                client = MetadataClientModel.objects.get(hostname=key)
            except MetadataClientModel.DoesNotExist:
                raise KeyError(key)
            client.version = None
            client.save()

        def __len__(self):
            return MetadataClientModel.objects.count()

        def __iter__(self):
            for client in MetadataClientModel.objects.all():
                yield client.hostname

        def keys(self):
            return [c.hostname for c in MetadataClientModel.objects.all()]

        def __contains__(self, key):
            try:
                MetadataClientModel.objects.get(hostname=key)
                return True
            except MetadataClientModel.DoesNotExist:
                return False


class XMLMetadataConfig(Bcfg2.Server.Plugin.XMLFileBacked):
    """Handles xml config files and all XInclude statements"""

    def __init__(self, metadata, watch_clients, basefile):
        # we tell XMLFileBacked _not_ to add a monitor for this file,
        # because the main Metadata plugin has already added one.
        # then we immediately set should_monitor to the proper value,
        # so that XInclude'd files get properly watched
        fpath = os.path.join(metadata.data, basefile)
        Bcfg2.Server.Plugin.XMLFileBacked.__init__(self, fpath,
                                                   fam=metadata.core.fam,
                                                   should_monitor=False)
        self.should_monitor = watch_clients
        self.metadata = metadata
        self.basefile = basefile
        self.data = None
        self.basedata = None
        self.basedir = metadata.data
        self.logger = metadata.logger
        self.pseudo_monitor = isinstance(metadata.core.fam,
                                         Bcfg2.Server.FileMonitor.Pseudo)

    def _get_xdata(self):
        """ getter for xdata property """
        if not self.data:
            raise Bcfg2.Server.Plugin.MetadataRuntimeError("%s has no data" %
                                                           self.basefile)
        return self.data

    def _set_xdata(self, val):
        """ setter for xdata property. in practice this should only be
        used by the test suite """
        self.data = val

    xdata = property(_get_xdata, _set_xdata)

    @property
    def base_xdata(self):
        """ property to get the data of the base file (without any
        xincludes processed) """
        if not self.basedata:
            raise Bcfg2.Server.Plugin.MetadataRuntimeError("%s has no data" %
                                                           self.basefile)
        return self.basedata

    def load_xml(self):
        """Load changes from XML"""
        try:
            xdata = lxml.etree.parse(os.path.join(self.basedir, self.basefile),
                                     parser=Bcfg2.Server.XMLParser)
        except lxml.etree.XMLSyntaxError:
            self.logger.error('Failed to parse %s' % self.basefile)
            return
        self.extras = []
        self.basedata = copy.copy(xdata)
        self._follow_xincludes(xdata=xdata)
        if self.extras:
            try:
                xdata.xinclude()
            except lxml.etree.XIncludeError:
                self.logger.error("Failed to process XInclude for file %s" %
                                  self.basefile)
        self.data = xdata

    def write(self):
        """Write changes to xml back to disk."""
        self.write_xml(os.path.join(self.basedir, self.basefile),
                       self.basedata)

    def write_xml(self, fname, xmltree):
        """Write changes to xml back to disk."""
        tmpfile = "%s.new" % fname
        datafile = None
        fd = None
        i = 0  # counter to avoid flooding logs with lock messages
        while datafile is None:
            try:
                fd = os.open(tmpfile, os.O_CREAT | os.O_EXCL | os.O_WRONLY)
                datafile = os.fdopen(fd, 'w')
            except OSError:
                err = sys.exc_info()[1]
                if err.errno == errno.EEXIST:
                    # note: not a real lock.  this is here to avoid
                    # the scenario where two threads write to the file
                    # at the same-ish time, and one writes to
                    # foo.xml.new, then the other one writes to it
                    # (losing the first thread's changes), then the
                    # first renames it, then the second tries to
                    # rename it and borks.
                    if (i % 10) == 0:
                        self.logger.info("%s is locked, waiting" % fname)
                    i += 1
                    time.sleep(0.1)
                else:
                    msg = "Failed to write %s: %s" % (tmpfile, err)
                    self.logger.error(msg)
                    raise Bcfg2.Server.Plugin.MetadataRuntimeError(msg)
        # prep data
        dataroot = xmltree.getroot()
        newcontents = lxml.etree.tostring(dataroot, xml_declaration=False,
                                          pretty_print=True).decode('UTF-8')

        while locked(fd):
            pass
        try:
            datafile.write(newcontents)
        except:
            fcntl.lockf(fd, fcntl.LOCK_UN)
            msg = "Metadata: Failed to write new xml data to %s: %s" % \
                (tmpfile, sys.exc_info()[1])
            self.logger.error(msg, exc_info=1)
            os.unlink(tmpfile)
            raise Bcfg2.Server.Plugin.MetadataRuntimeError(msg)
        datafile.close()
        # check if clients.xml is a symlink
        if os.path.islink(fname):
            fname = os.readlink(fname)

        try:
            os.rename(tmpfile, fname)
        except:  # pylint: disable=W0702
            try:
                os.unlink(tmpfile)
            except:  # pylint: disable=W0702
                pass
            msg = "Metadata: Failed to rename %s: %s" % (tmpfile,
                                                         sys.exc_info()[1])
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.MetadataRuntimeError(msg)

    def find_xml_for_xpath(self, xpath):
        """Find and load xml file containing the xpath query"""
        if self.pseudo_monitor:
            # Reload xml if we don't have a real monitor
            self.load_xml()
        cli = self.basedata.xpath(xpath)
        if len(cli) > 0:
            return {'filename': os.path.join(self.basedir, self.basefile),
                    'xmltree': self.basedata,
                    'xquery': cli}
        else:
            # Try to find the data in included files
            for included in self.extras:
                try:
                    xdata = lxml.etree.parse(included,
                                             parser=Bcfg2.Server.XMLParser)
                    cli = xdata.xpath(xpath)
                    if len(cli) > 0:
                        return {'filename': included,
                                'xmltree': xdata,
                                'xquery': cli}
                except lxml.etree.XMLSyntaxError:
                    self.logger.error('Failed to parse %s' % included)
        return {}

    def add_monitor(self, fpath):
        self.extras.append(fpath)
        if self.fam and self.should_monitor:
            self.fam.AddMonitor(fpath, self.metadata)

    def HandleEvent(self, event=None):
        """Handle fam events"""
        filename = os.path.basename(event.filename)
        if event.filename in self.extras:
            if event.code2str() == 'exists':
                return False
        elif filename != self.basefile:
            return False
        if event.code2str() == 'endExist':
            return False
        self.load_xml()
        return True


class ClientMetadata(object):
    """This object contains client metadata."""
    # pylint: disable=R0913
    def __init__(self, client, profile, groups, bundles, aliases, addresses,
                 categories, uuid, password, version, query):
        self.hostname = client
        self.profile = profile
        self.bundles = bundles
        self.aliases = aliases
        self.addresses = addresses
        self.groups = groups
        self.categories = categories
        self.uuid = uuid
        self.password = password
        self.connectors = []
        self.version = version
        try:
            self.version_info = Bcfg2VersionInfo(version)
        except (ValueError, AttributeError):
            self.version_info = None
        self.query = query
    # pylint: enable=R0913

    def inGroup(self, group):
        """Test to see if client is a member of group."""
        return group in self.groups

    def group_in_category(self, category):
        """ return the group in the given category that the client is
        a member of, or the empty string """
        for grp in self.query.all_groups_in_category(category):
            if grp in self.groups:
                return grp
        return ''


class MetadataQuery(object):
    """ object supplied to client metadata to allow client metadata
    objects to query metadata without being able to modify it """

    def __init__(self, by_name, get_clients, by_groups, by_profiles,
                 all_groups, all_groups_in_category):
        # resolver is set later
        self.by_name = by_name
        self.names_by_groups = self._warn_string(by_groups)
        self.names_by_profiles = self._warn_string(by_profiles)
        self.all_clients = get_clients
        self.all_groups = all_groups
        self.all_groups_in_category = all_groups_in_category

    def _warn_string(self, func):
        """ decorator to warn that a MetadataQuery function that
        expects a list has been called with a single string argument
        instead.  this is a common mistake in templates, and it
        doesn't cause errors because strings are iterables """

        # pylint: disable=C0111
        @wraps(func)
        def inner(arg):
            if isinstance(arg, str):
                LOGGER.warning("%s: %s takes a list as argument, not a string"
                               % (self.__class__.__name__, func.__name__))
            return func(arg)
        # pylint: enable=C0111

        return inner

    def by_groups(self, groups):
        """ get a list of ClientMetadata objects that are in all given
        groups """
        # don't need to decorate this with _warn_string because
        # names_by_groups is decorated
        return [self.by_name(name) for name in self.names_by_groups(groups)]

    def by_profiles(self, profiles):
        """ get a list of ClientMetadata objects that are in any of
        the given profiles """
        # don't need to decorate this with _warn_string because
        # names_by_profiles is decorated
        return [self.by_name(name)
                for name in self.names_by_profiles(profiles)]

    def all(self):
        """ get a list of all ClientMetadata objects """
        return [self.by_name(name) for name in self.all_clients()]


class MetadataGroup(tuple):
    """ representation of a metadata group.  basically just a named tuple """

    # pylint: disable=R0913,W0613
    def __new__(cls, name, bundles=None, category=None, is_profile=False,
                is_public=False):
        if bundles is None:
            bundles = set()
        return tuple.__new__(cls, (bundles, category))
    # pylint: enable=W0613

    def __init__(self, name, bundles=None, category=None, is_profile=False,
                 is_public=False):
        if bundles is None:
            bundles = set()
        tuple.__init__(self)
        self.name = name
        self.bundles = bundles
        self.category = category
        self.is_profile = is_profile
        self.is_public = is_public
        # record which clients we've warned about category suppression
        self.warned = []
    # pylint: enable=R0913

    def __str__(self):
        return repr(self)

    def __repr__(self):
        return "%s %s (bundles=%s, category=%s)" % \
            (self.__class__.__name__, self.name, self.bundles,
             self.category)

    def __hash__(self):
        return hash(self.name)


class Metadata(Bcfg2.Server.Plugin.Metadata,
               Bcfg2.Server.Plugin.Statistics,
               Bcfg2.Server.Plugin.DatabaseBacked):
    """This class contains data for bcfg2 server metadata."""
    __author__ = 'bcfg-dev@mcs.anl.gov'
    sort_order = 500

    def __init__(self, core, datastore, watch_clients=True):
        Bcfg2.Server.Plugin.Metadata.__init__(self)
        Bcfg2.Server.Plugin.Statistics.__init__(self, core, datastore)
        Bcfg2.Server.Plugin.DatabaseBacked.__init__(self, core, datastore)
        self.watch_clients = watch_clients
        self.states = dict()
        self.extra = dict()
        self.handlers = dict()
        self.groups_xml = self._handle_file("groups.xml")
        if (self._use_db and
            os.path.exists(os.path.join(self.data, "clients.xml"))):
            self.logger.warning("Metadata: database enabled but clients.xml "
                                "found, parsing in compatibility mode")
            self.clients_xml = self._handle_file("clients.xml")
        elif not self._use_db:
            self.clients_xml = self._handle_file("clients.xml")

        # mapping of clientname -> authtype
        self.auth = dict()
        # list of clients required to have non-global password
        self.secure = []
        # list of floating clients
        self.floating = []
        # mapping of clientname -> password
        self.passwords = {}
        self.addresses = {}
        self.raddresses = {}
        # mapping of clientname -> [groups]
        self.clientgroups = {}
        # list of clients
        self.clients = []
        self.aliases = {}
        self.raliases = {}
        # mapping of groupname -> MetadataGroup object
        self.groups = {}
        # mappings of predicate -> MetadataGroup object
        self.group_membership = dict()
        self.negated_groups = dict()
        # mapping of hostname -> version string
        if self._use_db:
            self.versions = ClientVersions(core, datastore)
        else:
            self.versions = dict()
        self.uuid = {}
        self.session_cache = {}
        self.default = None
        self.pdirty = False
        self.password = core.setup['password']
        self.query = MetadataQuery(core.build_metadata,
                                   lambda: list(self.clients),
                                   self.get_client_names_by_groups,
                                   self.get_client_names_by_profiles,
                                   self.get_all_group_names,
                                   self.get_all_groups_in_category)

    @classmethod
    def init_repo(cls, repo, **kwargs):
        # must use super here; inheritance works funny with class methods
        super(Metadata, cls).init_repo(repo)

        for fname in ["clients.xml", "groups.xml"]:
            aname = re.sub(r'[^A-z0-9_]', '_', fname)
            if aname in kwargs:
                open(os.path.join(repo, cls.name, fname),
                     "w").write(kwargs[aname])

    def _handle_file(self, fname):
        """ set up the necessary magic for handling a metadata file
        (clients.xml or groups.xml, e.g.) """
        if self.watch_clients:
            try:
                self.core.fam.AddMonitor(os.path.join(self.data, fname), self)
            except:
                err = sys.exc_info()[1]
                msg = "Unable to add file monitor for %s: %s" % (fname, err)
                self.logger.error(msg)
                raise Bcfg2.Server.Plugin.PluginInitError(msg)
            self.states[fname] = False
        xmlcfg = XMLMetadataConfig(self, self.watch_clients, fname)
        aname = re.sub(r'[^A-z0-9_]', '_', os.path.basename(fname))
        self.handlers[xmlcfg.HandleEvent] = getattr(self,
                                                    "_handle_%s_event" % aname)
        self.extra[fname] = []
        return xmlcfg

    def _search_xdata(self, tag, name, tree, alias=False):
        """ Generic method to find XML data (group, client, etc.) """
        for node in tree.findall("//%s" % tag):
            if node.get("name") == name:
                return node
            elif alias:
                for child in node:
                    if (child.tag == "Alias" and
                        child.attrib["name"] == name):
                        return node
        return None

    def search_group(self, group_name, tree):
        """Find a group."""
        return self._search_xdata("Group", group_name, tree)

    def search_bundle(self, bundle_name, tree):
        """Find a bundle."""
        return self._search_xdata("Bundle", bundle_name, tree)

    def search_client(self, client_name, tree):
        """ find a client in the given XML tree """
        return self._search_xdata("Client", client_name, tree, alias=True)

    def _add_xdata(self, config, tag, name, attribs=None, alias=False):
        """ Generic method to add XML data (group, client, etc.) """
        node = self._search_xdata(tag, name, config.xdata, alias=alias)
        if node != None:
            raise Bcfg2.Server.Plugin.MetadataConsistencyError("%s \"%s\" "
                                                               "already exists"
                                                               % (tag, name))
        element = lxml.etree.SubElement(config.base_xdata.getroot(),
                                        tag, name=name)
        if attribs:
            for key, val in list(attribs.items()):
                element.set(key, val)
        config.write()
        return element

    def add_group(self, group_name, attribs):
        """Add group to groups.xml."""
        if self._use_db:
            msg = "Metadata does not support adding groups with " + \
                "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._add_xdata(self.groups_xml, "Group", group_name,
                                   attribs=attribs)

    def add_bundle(self, bundle_name):
        """Add bundle to groups.xml."""
        if self._use_db:
            msg = "Metadata does not support adding bundles with " + \
                "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._add_xdata(self.groups_xml, "Bundle", bundle_name)

    @Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
    def add_client(self, client_name, attribs=None):
        """Add client to clients.xml."""
        if attribs is None:
            attribs = dict()
        if self._use_db:
            try:
                client = MetadataClientModel.objects.get(hostname=client_name)
            except MetadataClientModel.DoesNotExist:
                client = MetadataClientModel(hostname=client_name)
                client.save()
            self.clients = self.list_clients()
            return client
        else:
            try:
                return self._add_xdata(self.clients_xml, "Client", client_name,
                                       attribs=attribs, alias=True)
            except Bcfg2.Server.Plugin.MetadataConsistencyError:
                # already exists
                err = sys.exc_info()[1]
                self.logger.info(err)
                return self._search_xdata("Client", client_name,
                                          self.clients_xml.xdata, alias=True)

    def _update_xdata(self, config, tag, name, attribs, alias=False):
        """ Generic method to modify XML data (group, client, etc.) """
        node = self._search_xdata(tag, name, config.xdata, alias=alias)
        if node == None:
            self.logger.error("%s \"%s\" does not exist" % (tag, name))
            raise Bcfg2.Server.Plugin.MetadataConsistencyError
        xdict = config.find_xml_for_xpath('.//%s[@name="%s"]' %
                                          (tag, node.get('name')))
        if not xdict:
            self.logger.error("Unexpected error finding %s \"%s\"" %
                              (tag, name))
            raise Bcfg2.Server.Plugin.MetadataConsistencyError
        for key, val in list(attribs.items()):
            xdict['xquery'][0].set(key, val)
        config.write_xml(xdict['filename'], xdict['xmltree'])

    def update_group(self, group_name, attribs):
        """Update a groups attributes."""
        if self._use_db:
            msg = "Metadata does not support updating groups with " + \
            "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._update_xdata(self.groups_xml, "Group", group_name,
                                      attribs)

    def update_client(self, client_name, attribs):
        """Update a clients attributes."""
        if self._use_db:
            msg = "Metadata does not support updating clients with " + \
                "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._update_xdata(self.clients_xml, "Client", client_name,
                                      attribs, alias=True)

    def list_clients(self):
        """ List all clients in client database """
        if self._use_db:
            return set([c.hostname for c in MetadataClientModel.objects.all()])
        else:
            return self.clients

    def _remove_xdata(self, config, tag, name):
        """ Generic method to remove XML data (group, client, etc.) """
        node = self._search_xdata(tag, name, config.xdata)
        if node == None:
            self.logger.error("%s \"%s\" does not exist" % (tag, name))
            raise Bcfg2.Server.Plugin.MetadataConsistencyError
        xdict = config.find_xml_for_xpath('.//%s[@name="%s"]' %
                                          (tag, node.get('name')))
        if not xdict:
            self.logger.error("Unexpected error finding %s \"%s\"" %
                              (tag, name))
            raise Bcfg2.Server.Plugin.MetadataConsistencyError
        xdict['xquery'][0].getparent().remove(xdict['xquery'][0])
        config.write_xml(xdict['filename'], xdict['xmltree'])

    def remove_group(self, group_name):
        """Remove a group."""
        if self._use_db:
            msg = "Metadata does not support removing groups with " + \
                "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._remove_xdata(self.groups_xml, "Group", group_name)

    def remove_bundle(self, bundle_name):
        """Remove a bundle."""
        if self._use_db:
            msg = "Metadata does not support removing bundles with " + \
                "use_database enabled"
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.PluginExecutionError(msg)
        else:
            return self._remove_xdata(self.groups_xml, "Bundle", bundle_name)

    def remove_client(self, client_name):
        """Remove a bundle."""
        if self._use_db:
            try:
                client = MetadataClientModel.objects.get(hostname=client_name)
            except MetadataClientModel.DoesNotExist:
                msg = "Client %s does not exist" % client_name
                self.logger.warning(msg)
                raise Bcfg2.Server.Plugin.MetadataConsistencyError(msg)
            client.delete()
            self.clients = self.list_clients()
        else:
            return self._remove_xdata(self.clients_xml, "Client", client_name)

    def _handle_clients_xml_event(self, _):  # pylint: disable=R0912
        """ handle all events for clients.xml and files xincluded from
        clients.xml """
        xdata = self.clients_xml.xdata
        self.clients = []
        self.clientgroups = {}
        self.aliases = {}
        self.raliases = {}
        self.secure = []
        self.floating = []
        self.addresses = {}
        self.raddresses = {}
        for client in xdata.findall('.//Client'):
            clname = client.get('name').lower()
            if 'address' in client.attrib:
                caddr = client.get('address')
                if caddr in self.addresses:
                    self.addresses[caddr].append(clname)
                else:
                    self.addresses[caddr] = [clname]
                if clname not in self.raddresses:
                    self.raddresses[clname] = set()
                self.raddresses[clname].add(caddr)
            if 'auth' in client.attrib:
                self.auth[client.get('name')] = client.get('auth',
                                                           'cert+password')
            if 'uuid' in client.attrib:
                self.uuid[client.get('uuid')] = clname
            if client.get('secure', 'false').lower() == 'true':
                self.secure.append(clname)
            if (client.get('location', 'fixed') == 'floating' or
                client.get('floating', 'false').lower() == 'true'):
                self.floating.append(clname)
            if 'password' in client.attrib:
                self.passwords[clname] = client.get('password')
            if 'version' in client.attrib:
                self.versions[clname] = client.get('version')

            self.raliases[clname] = set()
            for alias in client.findall('Alias'):
                self.aliases.update({alias.get('name'): clname})
                self.raliases[clname].add(alias.get('name'))
                if 'address' not in alias.attrib:
                    continue
                if alias.get('address') in self.addresses:
                    self.addresses[alias.get('address')].append(clname)
                else:
                    self.addresses[alias.get('address')] = [clname]
                if clname not in self.raddresses:
                    self.raddresses[clname] = set()
                self.raddresses[clname].add(alias.get('address'))
            self.clients.append(clname)
            profile = client.get("profile")
            if self.groups:  # check if we've parsed groups.xml yet
                if profile not in self.groups:
                    self.logger.warning("Metadata: %s has nonexistent "
                                        "profile group %s" % (clname, profile))
                elif not self.groups[profile].is_profile:
                    self.logger.warning("Metadata: %s set as profile for "
                                        "%s, but is not a profile group" %
                                        (profile, clname))
            try:
                self.clientgroups[clname].append(profile)
            except KeyError:
                self.clientgroups[clname] = [profile]
        self.states['clients.xml'] = True
        if self._use_db:
            self.clients = self.list_clients()

    def _handle_groups_xml_event(self, _):  # pylint: disable=R0912
        """ re-read groups.xml on any event on it """
        self.groups = {}

        # these three functions must be separate functions in order to
        # ensure that the scope is right for the closures they return
        def get_condition(element):
            """ Return a predicate that returns True if a client meets
            the condition specified in the given Group or Client
            element """
            negate = element.get('negate', 'false').lower() == 'true'
            pname = element.get("name")
            if element.tag == 'Group':
                return lambda c, g, _: negate != (pname in g)
            elif element.tag == 'Client':
                return lambda c, g, _: negate != (pname == c)

        def get_category_condition(category, gname):
            """ get a predicate that returns False if a client is
            already a member of a group in the given category, True
            otherwise """
            def in_cat(client, groups, categories):  # pylint: disable=W0613
                """ return True if the client is already a member of a
                group in the category given in the enclosing function,
                False otherwise """
                if category in categories:
                    if (gname not in self.groups or
                        client not in self.groups[gname].warned):
                        self.logger.warning("%s: Group %s suppressed by "
                                            "category %s; %s already a member "
                                            "of %s" %
                                            (self.name, gname, category,
                                             client, categories[category]))
                        if gname in self.groups:
                            self.groups[gname].warned.append(client)
                    return False
                return True
            return in_cat

        def aggregate_conditions(conditions):
            """ aggregate all conditions on a given group declaration
            into a single predicate """
            return lambda client, groups, cats: \
                all(cond(client, groups, cats) for cond in conditions)

        # first, we get a list of all of the groups declared in the
        # file.  we do this in two stages because the old way of
        # parsing groups.xml didn't support nested groups; in the old
        # way, only Group tags under a Groups tag counted as
        # declarative.  so we parse those first, and then parse the
        # other Group tags if they haven't already been declared.
        # this lets you set options on a group (e.g., public="false")
        # at the top level and then just use the name elsewhere, which
        # is the original behavior
        for grp in self.groups_xml.xdata.xpath("//Groups/Group") + \
                self.groups_xml.xdata.xpath("//Groups/Group//Group"):
            if grp.get("name") in self.groups:
                continue
            self.groups[grp.get("name")] = \
                MetadataGroup(grp.get("name"),
                              bundles=[b.get("name")
                                       for b in grp.findall("Bundle")],
                              category=grp.get("category"),
                              is_profile=grp.get("profile", "false") == "true",
                              is_public=grp.get("public", "false") == "true")
            if grp.get('default', 'false') == 'true':
                self.default = grp.get('name')

        self.group_membership = dict()
        self.negated_groups = dict()

        # confusing loop condition; the XPath query asks for all
        # elements under a Group tag under a Groups tag; that is
        # infinitely recursive, so "all" elements really means _all_
        # elements.  We then manually filter out non-Group elements
        # since there doesn't seem to be a way to get Group elements
        # of arbitrary depth with particular ultimate ancestors in
        # XPath.  We do the same thing for Client tags.
        for el in self.groups_xml.xdata.xpath("//Groups/Group//*") + \
                self.groups_xml.xdata.xpath("//Groups/Client//*"):
            if ((el.tag != 'Group' and el.tag != 'Client') or
                el.getchildren()):
                continue

            conditions = []
            for parent in el.iterancestors():
                cond = get_condition(parent)
                if cond:
                    conditions.append(cond)

            gname = el.get("name")
            if el.get("negate", "false").lower() == "true":
                self.negated_groups[aggregate_conditions(conditions)] = \
                    self.groups[gname]
            else:
                if self.groups[gname].category:
                    conditions.append(
                        get_category_condition(self.groups[gname].category,
                                               gname))

                self.group_membership[aggregate_conditions(conditions)] = \
                    self.groups[gname]
        self.states['groups.xml'] = True

    def HandleEvent(self, event):
        """Handle update events for data files."""
        for handles, event_handler in self.handlers.items():
            if handles(event):
                # clear the entire cache when we get an event for any
                # metadata file
                self.core.metadata_cache.expire()
                event_handler(event)

        if False not in list(self.states.values()) and self.debug_flag:
            # check that all groups are real and complete. this is
            # just logged at a debug level because many groups might
            # be probed, and we don't want to warn about them.
            for client, groups in list(self.clientgroups.items()):
                for group in groups:
                    if group not in self.groups:
                        self.debug_log("Client %s set as nonexistent group %s"
                                       % (client, group))
            for gname, ginfo in list(self.groups.items()):
                for group in ginfo.groups:
                    if group not in self.groups:
                        self.debug_log("Group %s set as nonexistent group %s" %
                                       (gname, group))

    def set_profile(self, client, profile, addresspair):
        """Set group parameter for provided client."""
        self.logger.info("Asserting client %s profile to %s" %
                         (client, profile))
        if False in list(self.states.values()):
            raise Bcfg2.Server.Plugin.MetadataRuntimeError("Metadata has not "
                                                           "been read yet")
        if profile not in self.groups:
            msg = "Profile group %s does not exist" % profile
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.MetadataConsistencyError(msg)
        group = self.groups[profile]
        if not group.is_public:
            msg = "Cannot set client %s to private group %s" % (client,
                                                                profile)
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.MetadataConsistencyError(msg)

        if client in self.clients:
            if self._use_db:
                msg = "DBMetadata does not support asserting client profiles"
                self.logger.error(msg)
                raise Bcfg2.Server.Plugin.PluginExecutionError(msg)

            profiles = [g for g in self.clientgroups[client]
                        if g in self.groups and self.groups[g].is_profile]
            self.logger.info("Changing %s profile from %s to %s" %
                             (client, profiles, profile))
            self.update_client(client, dict(profile=profile))
            if client in self.clientgroups:
                for prof in profiles:
                    self.clientgroups[client].remove(prof)
                self.clientgroups[client].append(profile)
            else:
                self.clientgroups[client] = [profile]
        else:
            self.logger.info("Creating new client: %s, profile %s" %
                             (client, profile))
            if self._use_db:
                self.add_client(client)
            else:
                if addresspair in self.session_cache:
                    # we are working with a uuid'd client
                    self.add_client(self.session_cache[addresspair][1],
                                    dict(uuid=client, profile=profile,
                                         address=addresspair[0]))
                else:
                    self.add_client(client, dict(profile=profile))
                self.clients.append(client)
                self.clientgroups[client] = [profile]
        if not self._use_db:
            self.clients_xml.write()

    def set_version(self, client, version):
        """Set group parameter for provided client."""
        if client in self.clients:
            if client not in self.versions or version != self.versions[client]:
                self.logger.info("Setting client %s version to %s" %
                                 (client, version))
                if not self._use_db:
                    self.update_client(client, dict(version=version))
                    self.clients_xml.write()
                self.versions[client] = version
        else:
            msg = "Cannot set version on non-existent client %s" % client
            self.logger.error(msg)
            raise Bcfg2.Server.Plugin.MetadataConsistencyError(msg)

    def resolve_client(self, addresspair, cleanup_cache=False):
        """Lookup address locally or in DNS to get a hostname."""
        if addresspair in self.session_cache:
            # client _was_ cached, so there can be some expired
            # entries. we need to clean them up to avoid potentially
            # infinite memory swell
            cache_ttl = 90
            if cleanup_cache:
                # remove entries for this client's IP address with
                # _any_ port numbers - perhaps a priority queue could
                # be faster?
                curtime = time.time()
                for addrpair in list(self.session_cache.keys()):
                    if addresspair[0] == addrpair[0]:
                        (stamp, _) = self.session_cache[addrpair]
                        if curtime - stamp > cache_ttl:
                            del self.session_cache[addrpair]
            # return the cached data
            try:
                stamp = self.session_cache[addresspair][0]
                if time.time() - stamp < cache_ttl:
                    return self.session_cache[addresspair][1]
            except KeyError:
                # we cleaned all cached data for this client in cleanup_cache
                pass
        address = addresspair[0]
        if address in self.addresses:
            if len(self.addresses[address]) != 1:
                err = ("Address %s has multiple reverse assignments; a "
                       "uuid must be used" % address)
                self.logger.error(err)
                raise Bcfg2.Server.Plugin.MetadataConsistencyError(err)
            return self.addresses[address][0]
        try:
            cname = socket.gethostbyaddr(address)[0].lower()
            if cname in self.aliases:
                return self.aliases[cname]
            return cname
        except socket.herror:
            err = "Address resolution error for %s: %s" % (address,
                                                           sys.exc_info()[1])
            self.logger.error(err)
            raise Bcfg2.Server.Plugin.MetadataConsistencyError(err)

    def _merge_groups(self, client, groups, categories=None):
        """ set group membership based on the contents of groups.xml
        and initial group membership of this client. Returns a tuple
        of (allgroups, categories)"""
        numgroups = -1  # force one initial pass
        if categories is None:
            categories = dict()
        while numgroups != len(groups):
            numgroups = len(groups)
            for predicate, group in self.group_membership.items():
                if group.name in groups:
                    continue
                if predicate(client, groups, categories):
                    groups.add(group.name)
                    if group.category:
                        categories[group.category] = group.name
            for predicate, group in self.negated_groups.items():
                if group.name not in groups:
                    continue
                if predicate(client, groups, categories):
                    groups.remove(group.name)
                    if group.category:
                        del categories[group.category]
        return (groups, categories)

    def get_initial_metadata(self, client):  # pylint: disable=R0914,R0912
        """Return the metadata for a given client."""
        if False in list(self.states.values()):
            raise Bcfg2.Server.Plugin.MetadataRuntimeError("Metadata has not "
                                                           "been read yet")
        client = client.lower()

        if client in self.core.metadata_cache:
            return self.core.metadata_cache[client]

        if client in self.aliases:
            client = self.aliases[client]

        groups = set()
        categories = dict()
        profile = None

        if client not in self.clients:
            pgroup = None
            if client in self.clientgroups:
                pgroup = self.clientgroups[client][0]
            elif self.default:
                pgroup = self.default

            if pgroup:
                self.set_profile(client, pgroup, (None, None))
                groups.add(pgroup)
                category = self.groups[pgroup].category
                if category:
                    categories[category] = pgroup
                if (pgroup in self.groups and self.groups[pgroup].is_profile):
                    profile = pgroup
            else:
                msg = "Cannot add new client %s; no default group set" % client
                self.logger.error(msg)
                raise Bcfg2.Server.Plugin.MetadataConsistencyError(msg)

        if client in self.clientgroups:
            for cgroup in self.clientgroups[client]:
                if cgroup in groups:
                    continue
                if cgroup not in self.groups:
                    self.groups[cgroup] = MetadataGroup(cgroup)
                category = self.groups[cgroup].category
                if category and category in categories:
                    self.logger.warning("%s: Group %s suppressed by "
                                        "category %s; %s already a member "
                                        "of %s" %
                                        (self.name, cgroup, category,
                                         client, categories[category]))
                    continue
                if category:
                    categories[category] = cgroup
                groups.add(cgroup)
                # favor client groups for setting profile
                if not profile and self.groups[cgroup].is_profile:
                    profile = cgroup

        groups, categories = self._merge_groups(client, groups,
                                                categories=categories)

        bundles = set()
        for group in groups:
            try:
                bundles.update(self.groups[group].bundles)
            except KeyError:
                self.logger.warning("%s: %s is a member of undefined group %s"
                                    % (self.name, client, group))

        aliases = self.raliases.get(client, set())
        addresses = self.raddresses.get(client, set())
        version = self.versions.get(client, None)
        if client in self.passwords:
            password = self.passwords[client]
        else:
            password = None
        uuids = [item for item, value in list(self.uuid.items())
                 if value == client]
        if uuids:
            uuid = uuids[0]
        else:
            uuid = None
        if not profile:
            # one last ditch attempt at setting the profile
            profiles = [g for g in groups
                        if g in self.groups and self.groups[g].is_profile]
            if len(profiles) >= 1:
                profile = profiles[0]

        rv = ClientMetadata(client, profile, groups, bundles, aliases,
                            addresses, categories, uuid, password, version,
                            self.query)
        if self.core.metadata_cache_mode == 'initial':
            self.core.metadata_cache[client] = rv
        return rv

    def get_all_group_names(self):
        """ return a list of all group names """
        all_groups = set()
        all_groups.update(self.groups.keys())
        all_groups.update([g.name for g in self.group_membership.values()])
        all_groups.update([g.name for g in self.negated_groups.values()])
        for grp in self.clientgroups.values():
            all_groups.update(grp)
        return all_groups

    def get_all_groups_in_category(self, category):
        """ return a list of names of groups in the given category """
        return set([g.name for g in self.groups.values()
                    if g.category == category])

    def get_client_names_by_profiles(self, profiles):
        """ return a list of names of clients in the given profile groups """
        rv = []
        for client in list(self.clients):
            mdata = self.core.build_metadata(client)
            if mdata.profile in profiles:
                rv.append(client)
        return rv

    def get_client_names_by_groups(self, groups):
        """ return a list of names of clients in the given groups """
        mdata = [self.core.build_metadata(client) for client in self.clients]
        return [md.hostname for md in mdata if md.groups.issuperset(groups)]

    def get_client_names_by_bundles(self, bundles):
        """ given a list of bundles, return a list of names of clients
        that use those bundles """
        mdata = [self.core.build_metadata(client) for client in self.clients]
        return [md.hostname for md in mdata if md.bundles.issuperset(bundles)]

    def merge_additional_groups(self, imd, groups):
        for group in groups:
            if group in imd.groups:
                continue
            if group in self.groups and self.groups[group].category:
                category = self.groups[group].category
                if self.groups[group].category in imd.categories:
                    self.logger.warning("%s: Group %s suppressed by category "
                                        "%s; %s already a member of %s" %
                                        (self.name, group, category,
                                         imd.hostname,
                                         imd.categories[category]))
                    continue
                imd.categories[category] = group
            imd.groups.add(group)

        self._merge_groups(imd.hostname, imd.groups,
                           categories=imd.categories)

        for group in imd.groups:
            if group in self.groups:
                imd.bundles.update(self.groups[group].bundles)

        if not imd.profile:
            # if the client still doesn't have a profile group after
            # initial metadata, try to find one in the additional
            # groups
            profiles = [g for g in groups
                        if g in self.groups and self.groups[g].is_profile]
            if len(profiles) >= 1:
                imd.profile = profiles[0]
            elif self.default:
                imd.profile = self.default

    def merge_additional_data(self, imd, source, data):
        if not hasattr(imd, source):
            setattr(imd, source, data)
            imd.connectors.append(source)

    def validate_client_address(self, client, addresspair):
        """Check address against client."""
        address = addresspair[0]
        if client in self.floating:
            self.debug_log("Client %s is floating" % client)
            return True
        if address in self.addresses:
            if client in self.addresses[address]:
                self.debug_log("Client %s matches address %s" %
                               (client, address))
                return True
            else:
                self.logger.error("Got request for non-float client %s from %s"
                                  % (client, address))
                return False
        resolved = self.resolve_client(addresspair)
        if resolved.lower() == client.lower():
            return True
        else:
            self.logger.error("Got request for %s from incorrect address %s" %
                              (client, address))
            self.logger.error("Resolved to %s" % resolved)
            return False

    # pylint: disable=R0911,R0912
    def AuthenticateConnection(self, cert, user, password, address):
        """This function checks auth creds."""
        if not isinstance(user, str):
            user = user.decode('utf-8')
        if cert:
            id_method = 'cert'
            certinfo = dict([x[0] for x in cert['subject']])
            # look at cert.cN
            client = certinfo['commonName']
            self.debug_log("Got cN %s; using as client name" % client)
            auth_type = self.auth.get(client, 'cert+password')
        elif user == 'root':
            id_method = 'address'
            try:
                client = self.resolve_client(address)
            except Bcfg2.Server.Plugin.MetadataConsistencyError:
                err = sys.exc_info()[1]
                self.logger.error("Client %s failed to resolve: %s" %
                                  (address[0], err))
                return False
        else:
            id_method = 'uuid'
            # user maps to client
            if user not in self.uuid:
                client = user
                self.uuid[user] = user
            else:
                client = self.uuid[user]

        # we have the client name
        self.debug_log("Authenticating client %s" % client)

        # next we validate the address
        if id_method == 'uuid':
            addr_is_valid = True
        else:
            addr_is_valid = self.validate_client_address(client, address)

        if not addr_is_valid:
            return False

        if id_method == 'cert' and auth_type != 'cert+password':
            # remember the cert-derived client name for this connection
            if client in self.floating:
                self.session_cache[address] = (time.time(), client)
            # we are done if cert+password not required
            return True

        if client not in self.passwords:
            if client in self.secure:
                self.logger.error("Client %s in secure mode but has no "
                                  "password" % address[0])
                return False
            if password != self.password:
                self.logger.error("Client %s used incorrect global password" %
                                  address[0])
                return False
        if client not in self.secure:
            if client in self.passwords:
                plist = [self.password, self.passwords[client]]
            else:
                plist = [self.password]
            if password not in plist:
                self.logger.error("Client %s failed to use either allowed "
                                  "password" % address[0])
                return False
        else:
            # client in secure mode and has a client password
            if password != self.passwords[client]:
                self.logger.error("Client %s failed to use client password in "
                                  "secure mode" % address[0])
                return False
        # populate the session cache
        if user != 'root':
            self.session_cache[address] = (time.time(), client)
        return True
    # pylint: enable=R0911,R0912

    def process_statistics(self, meta, _):
        """ Hook into statistics interface to toggle clients in
        bootstrap mode """
        client = meta.hostname
        if client in self.auth and self.auth[client] == 'bootstrap':
            self.update_client(client, dict(auth='cert'))

    def viz(self, hosts, bundles, key, only_client, colors):
        """Admin mode viz support."""
        clientmeta = None
        if only_client:
            clientmeta = self.core.build_metadata(only_client)

        groups = self.groups_xml.xdata.getroot()
        categories = {'default': 'grey83'}
        viz_str = []
        egroups = groups.findall("Group") + groups.findall('.//Groups/Group')
        color = 0
        for group in egroups:
            if not group.get('category') in categories:
                categories[group.get('category')] = colors[color]
                color = (color + 1) % len(colors)
            group.set('color', categories[group.get('category')])
        if None in categories:
            del categories[None]
        if hosts:
            viz_str.extend(self._viz_hosts(only_client))
        if bundles:
            viz_str.extend(self._viz_bundles(bundles, clientmeta))
        viz_str.extend(self._viz_groups(egroups, bundles, clientmeta))
        if key:
            for category in categories:
                viz_str.append('"%s" [label="%s", shape="record", '
                               'style="filled", fillcolor="%s"];' %
                               (category, category, categories[category]))
        return "\n".join("\t" + s for s in viz_str)

    def _viz_hosts(self, only_client):
        """ add hosts to the viz graph """
        def include_client(client):
            """ return True if the given client should be included in
            the graph"""
            return not only_client or client != only_client

        instances = {}
        rv = []
        for client in list(self.clients):
            if include_client(client):
                continue
            if client in self.clientgroups:
                grps = self.clientgroups[client]
            elif self.default:
                grps = [self.default]
            else:
                continue
            for group in grps:
                try:
                    instances[group].append(client)
                except KeyError:
                    instances[group] = [client]
        for group, clist in list(instances.items()):
            clist.sort()
            rv.append('"%s-instances" [ label="%s", shape="record" ];' %
                      (group, '|'.join(clist)))
            rv.append('"%s-instances" -> "group-%s";' % (group, group))
        return rv

    def _viz_bundles(self, bundles, clientmeta):
        """ add bundles to the viz graph """

        def include_bundle(bundle):
            """ return True if the given bundle should be included in
            the graph"""
            return not clientmeta or bundle in clientmeta.bundles

        bundles = list(set(bund.get('name'))
                       for bund in self.groups_xml.xdata.findall('.//Bundle')
                       if include_bundle(bund.get('name')))
        bundles.sort()
        return ['"bundle-%s" [ label="%s", shape="septagon"];' % (bundle,
                                                                  bundle)
                for bundle in bundles]

    def _viz_groups(self, egroups, bundles, clientmeta):
        """ add groups to the viz graph """

        def include_group(group):
            """ return True if the given group should be included in
            the graph """
            return not clientmeta or group in clientmeta.groups

        rv = []
        gseen = []
        for group in egroups:
            if group.get('profile', 'false') == 'true':
                style = "filled, bold"
            else:
                style = "filled"
            gseen.append(group.get('name'))
            if include_group(group.get('name')):
                rv.append('"group-%s" [label="%s", style="%s", fillcolor=%s];'
                          % (group.get('name'), group.get('name'), style,
                             group.get('color')))
                if bundles:
                    for bundle in group.findall('Bundle'):
                        rv.append('"group-%s" -> "bundle-%s";' %
                                  (group.get('name'), bundle.get('name')))
        gfmt = '"group-%s" [label="%s", style="filled", fillcolor="grey83"];'
        for group in egroups:
            for parent in group.findall('Group'):
                if (parent.get('name') not in gseen and
                    include_group(parent.get('name'))):
                    rv.append(gfmt % (parent.get('name'),
                                      parent.get('name')))
                    gseen.append(parent.get("name"))
                if include_group(group.get('name')):
                    rv.append('"group-%s" -> "group-%s";' %
                              (group.get('name'), parent.get('name')))
        return rv


class MetadataLint(Bcfg2.Server.Lint.ServerPlugin):
    """ bcfg2-lint plugin for Metadata """

    def Run(self):
        self.nested_clients()
        self.deprecated_options()
        self.bogus_profiles()
        self.duplicate_groups()
        self.duplicate_default_groups()
        self.duplicate_clients()

    @classmethod
    def Errors(cls):
        return {"nested-client-tags": "warning",
                "deprecated-clients-options": "warning",
                "nonexistent-profile-group": "error",
                "non-profile-set-as-profile": "error",
                "duplicate-group": "error",
                "duplicate-client": "error",
                "multiple-default-groups": "error"}

    def deprecated_options(self):
        """ check for the location='floating' option, which has been
        deprecated in favor of floating='true' """
        clientdata = self.metadata.clients_xml.xdata
        for el in clientdata.xpath("//Client"):
            loc = el.get("location")
            if loc:
                if loc == "floating":
                    floating = True
                else:
                    floating = False
                self.LintError("deprecated-clients-options",
                               "The location='%s' option is deprecated.  "
                               "Please use floating='%s' instead:\n%s" %
                               (loc, floating, self.RenderXML(el)))

    def nested_clients(self):
        """ check for a Client tag inside a Client tag, which doesn't
        make any sense """
        groupdata = self.metadata.groups_xml.xdata
        for el in groupdata.xpath("//Client//Client"):
            self.LintError("nested-client-tags",
                           "Client %s nested within Client tag: %s" %
                           (el.get("name"), self.RenderXML(el)))

    def bogus_profiles(self):
        """ check for clients that have profiles that are either not
        flagged as public groups in groups.xml, or don't exist """
        for client in self.metadata.clients_xml.xdata.findall('.//Client'):
            profile = client.get("profile")
            if profile not in self.metadata.groups:
                self.LintError("nonexistent-profile-group",
                               "%s has nonexistent profile group %s:\n%s" %
                               (client.get("name"), profile,
                                self.RenderXML(client)))
            elif not self.metadata.groups[profile].is_profile:
                self.LintError("non-profile-set-as-profile",
                               "%s is set as profile for %s, but %s is not a "
                               "profile group:\n%s" %
                               (profile, client.get("name"), profile,
                                self.RenderXML(client)))

    def duplicate_groups(self):
        """ check for groups that are defined twice.  We count a group
        tag as a definition if it a) has profile or public set; or b)
        has any children. """
        self.duplicate_entries(
            self.metadata.groups_xml.xdata.xpath("//Groups/Group") + \
                self.metadata.groups_xml.xdata.xpath("//Groups/Group//Group"),
            "group",
            include=lambda g: (g.get("profile") or
                               g.get("public") or
                               g.getchildren()))

    def duplicate_default_groups(self):
        """ check for multiple default groups """
        defaults = []
        for grp in self.metadata.groups_xml.xdata.xpath("//Groups/Group") + \
                self.metadata.groups_xml.xdata.xpath("//Groups/Group//Group"):
            if grp.get("default", "false").lower() == "true":
                defaults.append(self.RenderXML(grp))
        if len(defaults) > 1:
            self.LintError("multiple-default-groups",
                           "Multiple default groups defined:\n%s" %
                           "\n".join(defaults))

    def duplicate_clients(self):
        """ check for clients that are defined twice. """
        self.duplicate_entries(
            self.metadata.clients_xml.xdata.xpath("//Client"),
            "client")

    def duplicate_entries(self, allentries, etype, include=None):
        """ generic duplicate entry finder """
        if include is None:
            include = lambda e: True
        entries = dict()
        for el in allentries:
            if include(el):
                if el.get("name") in entries:
                    entries[el.get("name")].append(self.RenderXML(el))
                else:
                    entries[el.get("name")] = [self.RenderXML(el)]
        for ename, els in entries.items():
            if len(els) > 1:
                self.LintError("duplicate-%s" % etype,
                               "%s %s is defined multiple times:\n%s" %
                               (etype.title(), ename, "\n".join(els)))