summaryrefslogtreecommitdiff
path: root/runtime/modules.c
blob: 6c5583ad0f5ad1e76a47a5560fe6eaaae9f069c3 (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
/* modules.c
 * This is the implementation of syslogd modules object.
 * This object handles plug-ins and build-in modules of all kind.
 *
 * Modules are reference-counted. Anyone who access a module must call
 * Use() before any function is accessed and Release() when he is done.
 * When the reference count reaches 0, rsyslog unloads the module (that
 * may be changed in the future to cache modules). Rsyslog does NOT
 * unload modules with a reference count > 0, even if the unload
 * method is called!
 *
 * File begun on 2007-07-22 by RGerhards
 *
 * Copyright 2007-2012 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of the rsyslog runtime library.
 *
 * The rsyslog runtime library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The rsyslog runtime library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the rsyslog runtime library.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 * A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
 */
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#ifdef	OS_BSD
#	include "libgen.h"
#endif

#include <dlfcn.h> /* TODO: replace this with the libtools equivalent! */

#include <unistd.h>
#include <sys/file.h>

#ifdef OS_SOLARIS
#	define PATH_MAX MAXPATHLEN
#endif

#include "cfsysline.h"
#include "rsconf.h"
#include "modules.h"
#include "errmsg.h"
#include "parser.h"
#include "strgen.h"

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(strgen)

static modInfo_t *pLoadedModules = NULL;	/* list of currently-loaded modules */
static modInfo_t *pLoadedModulesLast = NULL;	/* tail-pointer */

/* already dlopen()-ed libs */
static struct dlhandle_s *pHandles = NULL;

static uchar *pModDir;		/* directory where loadable modules are found */

/* tables for interfacing with the v6 config system */
/* action (instance) parameters */
static struct cnfparamdescr actpdescr[] = {
	{ "load", eCmdHdlrGetWord, 1 }
};
static struct cnfparamblk pblk =
	{ CNFPARAMBLK_VERSION,
	  sizeof(actpdescr)/sizeof(struct cnfparamdescr),
	  actpdescr
	};


/* we provide a set of dummy functions for modules that do not support the
 * some interfaces.
 * On the commit feature: As the modules do not support it, they commit each message they
 * receive, and as such the dummies can always return RS_RET_OK without causing
 * harm. This simplifies things as in action processing we do not need to check
 * if the transactional entry points exist.
 */
static rsRetVal
dummyBeginTransaction() 
{
	return RS_RET_OK;
}
static rsRetVal
dummyEndTransaction() 
{
	return RS_RET_OK;
}
static rsRetVal
dummyIsCompatibleWithFeature() 
{
	return RS_RET_INCOMPATIBLE;
}
static rsRetVal
dummynewActInst(uchar *modName, struct nvlst __attribute__((unused)) *dummy1,
	  	void __attribute__((unused)) **dummy2, omodStringRequest_t __attribute__((unused)) **dummy3) 
{
	errmsg.LogError(0, RS_RET_CONFOBJ_UNSUPPORTED, "config objects are not "
			"supported by module '%s' -- legacy config options "
			"MUST be used instead", modName);
	return RS_RET_CONFOBJ_UNSUPPORTED;
}

#ifdef DEBUG
/* we add some home-grown support to track our users (and detect who does not free us). In
 * the long term, this should probably be migrated into debug.c (TODO). -- rgerhards, 2008-03-11
 */

/* add a user to the current list of users (always at the root) */
static void
modUsrAdd(modInfo_t *pThis, char *pszUsr)
{
	modUsr_t *pUsr;

	BEGINfunc
	if((pUsr = calloc(1, sizeof(modUsr_t))) == NULL)
		goto finalize_it;

	if((pUsr->pszFile = strdup(pszUsr)) == NULL) {
		free(pUsr);
		goto finalize_it;
	}

	if(pThis->pModUsrRoot != NULL) {
		pUsr->pNext = pThis->pModUsrRoot;
	}
	pThis->pModUsrRoot = pUsr;

finalize_it:
	ENDfunc;
}


/* remove a user from the current user list
 * rgerhards, 2008-03-11
 */
static void
modUsrDel(modInfo_t *pThis, char *pszUsr)
{
	modUsr_t *pUsr;
	modUsr_t *pPrev = NULL;

	for(pUsr = pThis->pModUsrRoot ; pUsr != NULL ; pUsr = pUsr->pNext) {
		if(!strcmp(pUsr->pszFile, pszUsr))
			break;
		else
			pPrev = pUsr;
	}

	if(pUsr == NULL) {
		dbgprintf("oops - tried to delete user %s from module %s and it wasn't registered as one...\n",
			  pszUsr, pThis->pszName);
	} else {
		if(pPrev == NULL) {
			/* This was at the root! */
			pThis->pModUsrRoot = pUsr->pNext;
		} else {
			pPrev->pNext = pUsr->pNext;
		}
		/* free ressources */
		free(pUsr->pszFile);
		free(pUsr);
		pUsr = NULL; /* just to make sure... */
	}
}


/* print a short list all all source files using the module in question
 * rgerhards, 2008-03-11
 */
static void
modUsrPrint(modInfo_t *pThis)
{
	modUsr_t *pUsr;

	for(pUsr = pThis->pModUsrRoot ; pUsr != NULL ; pUsr = pUsr->pNext) {
		dbgprintf("\tmodule %s is currently in use by file %s\n",
			  pThis->pszName, pUsr->pszFile);
	}
}


/* print all loaded modules and who is accessing them. This is primarily intended
 * to be called at end of run to detect "module leaks" and who is causing them.
 * rgerhards, 2008-03-11
 */
//static void
void
modUsrPrintAll(void)
{
	modInfo_t *pMod;

	BEGINfunc
	for(pMod = pLoadedModules ; pMod != NULL ; pMod = pMod->pNext) {
		dbgprintf("printing users of loadable module %s, refcount %u, ptr %p, type %d\n", pMod->pszName, pMod->uRefCnt, pMod, pMod->eType);
		modUsrPrint(pMod);
	}
	ENDfunc
}

#endif /* #ifdef DEBUG */


/* Construct a new module object
 */
static rsRetVal moduleConstruct(modInfo_t **pThis)
{
	modInfo_t *pNew;

	if((pNew = calloc(1, sizeof(modInfo_t))) == NULL)
		return RS_RET_OUT_OF_MEMORY;

	/* OK, we got the element, now initialize members that should
	 * not be zero-filled.
	 */

	*pThis = pNew;
	return RS_RET_OK;
}


/* Destructs a module object. The object must not be linked to the
 * linked list of modules. Please note that all other dependencies on this
 * modules must have been removed before (e.g. CfSysLineHandlers!)
 */
static void moduleDestruct(modInfo_t *pThis)
{
	assert(pThis != NULL);
	free(pThis->pszName);
	free(pThis->cnfName);
	if(pThis->pModHdlr != NULL) {
#	ifdef	VALGRIND
#		warning "dlclose disabled for valgrind"
#	else
		if (pThis->eKeepType == eMOD_NOKEEP) {
			dlclose(pThis->pModHdlr);
		}
#	endif
	}

	free(pThis);
}


/* This enables a module to query the core for specific features.
 * rgerhards, 2009-04-22
 */
static rsRetVal queryCoreFeatureSupport(int *pBool, unsigned uFeat)
{
	DEFiRet;

	if((pBool == NULL))
		ABORT_FINALIZE(RS_RET_PARAM_ERROR);

	*pBool = (uFeat & CORE_FEATURE_BATCHING) ? 1 : 0;

finalize_it:
	RETiRet;
}


/* The following function is the queryEntryPoint for host-based entry points.
 * Modules may call it to get access to core interface functions. Please note
 * that utility functions can be accessed via shared libraries - at least this
 * is my current shool of thinking.
 * Please note that the implementation as a query interface allows to take
 * care of plug-in interface version differences. -- rgerhards, 2007-07-31
 * ... but often it better not to use a new interface. So we now add core
 * functions here that a plugin may request. -- rgerhards, 2009-04-22
 */
static rsRetVal queryHostEtryPt(uchar *name, rsRetVal (**pEtryPoint)())
{
	DEFiRet;

	if((name == NULL) || (pEtryPoint == NULL))
		ABORT_FINALIZE(RS_RET_PARAM_ERROR);

	if(!strcmp((char*) name, "regCfSysLineHdlr")) {
		*pEtryPoint = regCfSysLineHdlr;
	} else if(!strcmp((char*) name, "objGetObjInterface")) {
		*pEtryPoint = objGetObjInterface;
	} else if(!strcmp((char*) name, "OMSRgetSupportedTplOpts")) {
		*pEtryPoint = OMSRgetSupportedTplOpts;
	} else if(!strcmp((char*) name, "queryCoreFeatureSupport")) {
		*pEtryPoint = queryCoreFeatureSupport;
	} else {
		*pEtryPoint = NULL; /* to  be on the safe side */
		ABORT_FINALIZE(RS_RET_ENTRY_POINT_NOT_FOUND);
	}

finalize_it:
	RETiRet;
}


/* get the name of a module
 */
uchar *
modGetName(modInfo_t *pThis)
{
	return((pThis->pszName == NULL) ? (uchar*) "" : pThis->pszName);
}


/* get the state-name of a module. The state name is its name
 * together with a short description of the module state (which
 * is pulled from the module itself.
 * rgerhards, 2007-07-24
 * TODO: the actual state name is not yet pulled
 */
static uchar *modGetStateName(modInfo_t *pThis)
{
	return(modGetName(pThis));
}


/* Add a module to the loaded module linked list
 */
static inline void
addModToGlblList(modInfo_t *pThis)
{
	assert(pThis != NULL);

	if(pLoadedModules == NULL) {
		pLoadedModules = pLoadedModulesLast = pThis;
	} else {
		/* there already exist entries */
		pThis->pPrev = pLoadedModulesLast;
		pLoadedModulesLast->pNext = pThis;
		pLoadedModulesLast = pThis;
	}
}


/* ready module for config processing. this includes checking if the module
 * is already in the config, so this function may return errors. Returns a
 * pointer to the last module inthe current config. That pointer needs to
 * be passed to addModToCnfLst() when it is called later in the process.
 */
rsRetVal
readyModForCnf(modInfo_t *pThis, cfgmodules_etry_t **ppNew, cfgmodules_etry_t **ppLast)
{
	cfgmodules_etry_t *pNew = NULL;
	cfgmodules_etry_t *pLast;
	DEFiRet;
	assert(pThis != NULL);

	if(loadConf == NULL) {
		FINALIZE; /* we are in an early init state */
	}

	/* check for duplicates and, as a side-activity, identify last node */
	pLast = loadConf->modules.root; 
	if(pLast != NULL) {
		while(1) { /* loop broken inside */
			if(pLast->pMod == pThis) {
				DBGPRINTF("module '%s' already in this config\n", modGetName(pThis));
				if(strncmp((char*)modGetName(pThis), "builtin:", sizeof("builtin:")-1)) {
					errmsg.LogError(0, RS_RET_MODULE_ALREADY_IN_CONF,
					   "module '%s' already in this config, cannot be added\n", modGetName(pThis));
					ABORT_FINALIZE(RS_RET_MODULE_ALREADY_IN_CONF);
				}
				FINALIZE;
			}
			if(pLast->next == NULL)
				break;
			pLast = pLast->next;
		}
	}

	/* if we reach this point, pLast is the tail pointer and this module is new
	 * inside the currently loaded config. So, iff it is an input module, let's
	 * pass it a pointer which it can populate with a pointer to its module conf.
	 */

	CHKmalloc(pNew = MALLOC(sizeof(cfgmodules_etry_t)));
	pNew->canActivate = 1;
	pNew->next = NULL;
	pNew->pMod = pThis;

	if(pThis->beginCnfLoad != NULL) {
		CHKiRet(pThis->beginCnfLoad(&pNew->modCnf, loadConf));
	}

	*ppLast = pLast;
	*ppNew = pNew;
finalize_it:
	if(iRet != RS_RET_OK) {
		if(pNew != NULL)
			free(pNew);
	}
	RETiRet;
}


/* abort the creation of a module entry without adding it to the
 * module list. Needed to prevent mem leaks.
 */
static inline void
abortCnfUse(cfgmodules_etry_t *pNew)
{
	free(pNew);
}


/* Add a module to the config module list for current loadConf.
 * Requires last pointer obtained by readyModForCnf().
 */
rsRetVal
addModToCnfList(cfgmodules_etry_t *pNew, cfgmodules_etry_t *pLast)
{
	DEFiRet;
	assert(pNew != NULL);

	if(loadConf == NULL) {
		FINALIZE; /* we are in an early init state */
	}

	if(pLast == NULL) {
		loadConf->modules.root = pNew;
	} else {
		/* there already exist entries */
		pLast->next = pNew;
	}

finalize_it:
	RETiRet;
}


/* Get the next module pointer - this is used to traverse the list.
 * The function returns the next pointer or NULL, if there is no next one.
 * The last object must be provided to the function. If NULL is provided,
 * it starts at the root of the list. Even in this case, NULL may be 
 * returned - then, the list is empty.
 * rgerhards, 2007-07-23
 */
static modInfo_t *GetNxt(modInfo_t *pThis)
{
	modInfo_t *pNew;

	if(pThis == NULL)
		pNew = pLoadedModules;
	else
		pNew = pThis->pNext;

	return(pNew);
}


/* this function is like GetNxt(), but it returns pointers to
 * the configmodules entry, which than can be used to obtain the
 * actual module pointer. Note that it returns those for
 * modules of specific type only. Only modules from the provided
 * config are returned. Note that processing speed could be improved,
 * but this is really not relevant, as config file loading is not really
 * something we are concerned about in regard to runtime.
 */
static cfgmodules_etry_t
*GetNxtCnfType(rsconf_t *cnf, cfgmodules_etry_t *node, eModType_t rqtdType)
{
	if(node == NULL) { /* start at beginning of module list */
		node = cnf->modules.root;
	} else {
		node = node->next;
	}

	if(rqtdType != eMOD_ANY) { /* if any, we already have the right one! */
		while(node != NULL && node->pMod->eType != rqtdType) {
			node = node->next;
		}
	}

	return node;
}


/* Find a module with the given conf name and type. Returns NULL if none
 * can be found, otherwise module found.
 */
static modInfo_t *
FindWithCnfName(rsconf_t *cnf, uchar *name, eModType_t rqtdType)
{
	cfgmodules_etry_t *node;

	;
	for(  node = cnf->modules.root
	    ; node != NULL
	    ; node = node->next) {
		if(node->pMod->eType != rqtdType || node->pMod->cnfName == NULL)
			continue;
		if(!strcasecmp((char*)node->pMod->cnfName, (char*)name))
			break;
	}

	return node == NULL ? NULL : node->pMod;
}


/* Prepare a module for unloading.
 * This is currently a dummy, to be filled when we have a plug-in
 * interface - rgerhards, 2007-08-09
 * rgerhards, 2007-11-21:
 * When this function is called, all instance-data must already have
 * been destroyed. In the case of output modules, this happens when the
 * rule set is being destroyed. When we implement other module types, we
 * need to think how we handle it there (and if we have any instance data).
 * rgerhards, 2008-03-10: reject unload request if the module has a reference
 * count > 0.
 */
static rsRetVal
modPrepareUnload(modInfo_t *pThis)
{
	DEFiRet;
	void *pModCookie;

	assert(pThis != NULL);

	if(pThis->uRefCnt > 0) {
		dbgprintf("rejecting unload of module '%s' because it has a refcount of %d\n",
			  pThis->pszName, pThis->uRefCnt);
		ABORT_FINALIZE(RS_RET_MODULE_STILL_REFERENCED);
	}

	CHKiRet(pThis->modGetID(&pModCookie));
	pThis->modExit(); /* tell the module to get ready for unload */
	CHKiRet(unregCfSysLineHdlrs4Owner(pModCookie));

finalize_it:
	RETiRet;
}


/* Add an already-loaded module to the module linked list. This function does
 * everything needed to fully initialize the module.
 */
static rsRetVal
doModInit(rsRetVal (*modInit)(int, int*, rsRetVal(**)(), rsRetVal(*)(), modInfo_t*),
	  uchar *name, void *pModHdlr, modInfo_t **pNewModule)
{
	rsRetVal localRet;
	modInfo_t *pNew = NULL;
	uchar *pName;
	strgen_t *pStrgen; /* used for strgen modules */
	rsRetVal (*GetName)(uchar**);
	rsRetVal (*modGetType)(eModType_t *pType);
	rsRetVal (*modGetKeepType)(eModKeepType_t *pKeepType);
	struct dlhandle_s *pHandle = NULL;
	rsRetVal (*getModCnfName)(uchar **cnfName);
	uchar *cnfName;
	DEFiRet;

	assert(modInit != NULL);

	if((iRet = moduleConstruct(&pNew)) != RS_RET_OK) {
		pNew = NULL;
		ABORT_FINALIZE(iRet);
	}

	CHKiRet((*modInit)(CURR_MOD_IF_VERSION, &pNew->iIFVers, &pNew->modQueryEtryPt, queryHostEtryPt, pNew));

	if(pNew->iIFVers != CURR_MOD_IF_VERSION) {
		ABORT_FINALIZE(RS_RET_MISSING_INTERFACE);
	}

	/* We now poll the module to see what type it is. We do this only once as this
	 * can never change in the lifetime of an module. -- rgerhards, 2007-12-14
	 */
	CHKiRet((*pNew->modQueryEtryPt)((uchar*)"getType", &modGetType));
	CHKiRet((*modGetType)(&pNew->eType));
	CHKiRet((*pNew->modQueryEtryPt)((uchar*)"getKeepType", &modGetKeepType));
	CHKiRet((*modGetKeepType)(&pNew->eKeepType));
	dbgprintf("module %s of type %d being loaded (keepType=%d).\n", name, pNew->eType, pNew->eKeepType);
	
	/* OK, we know we can successfully work with the module. So we now fill the
	 * rest of the data elements. First we load the interfaces common to all
	 * module types.
	 */
	CHKiRet((*pNew->modQueryEtryPt)((uchar*)"modGetID", &pNew->modGetID));
	CHKiRet((*pNew->modQueryEtryPt)((uchar*)"modExit", &pNew->modExit));
	localRet = (*pNew->modQueryEtryPt)((uchar*)"isCompatibleWithFeature", &pNew->isCompatibleWithFeature);
	if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
		pNew->isCompatibleWithFeature = dummyIsCompatibleWithFeature;
	else if(localRet != RS_RET_OK)
		ABORT_FINALIZE(localRet);
	localRet = (*pNew->modQueryEtryPt)((uchar*)"setModCnf", &pNew->setModCnf);
	if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
		pNew->setModCnf = NULL;
	else if(localRet != RS_RET_OK)
		ABORT_FINALIZE(localRet);

	/* optional calls for new config system */
	localRet = (*pNew->modQueryEtryPt)((uchar*)"getModCnfName", &getModCnfName);
	if(localRet == RS_RET_OK) {
		if(getModCnfName(&cnfName) == RS_RET_OK)
			pNew->cnfName = (uchar*) strdup((char*)cnfName);
			  /**< we do not care if strdup() fails, we can accept that */
		else
			pNew->cnfName = NULL;
		dbgprintf("module config name is '%s'\n", cnfName);
	}
	localRet = (*pNew->modQueryEtryPt)((uchar*)"beginCnfLoad", &pNew->beginCnfLoad);
	if(localRet == RS_RET_OK) {
		dbgprintf("module %s supports rsyslog v6 config interface\n", name);
		CHKiRet((*pNew->modQueryEtryPt)((uchar*)"endCnfLoad", &pNew->endCnfLoad));
		CHKiRet((*pNew->modQueryEtryPt)((uchar*)"freeCnf", &pNew->freeCnf));
		CHKiRet((*pNew->modQueryEtryPt)((uchar*)"checkCnf", &pNew->checkCnf));
		CHKiRet((*pNew->modQueryEtryPt)((uchar*)"activateCnf", &pNew->activateCnf));
		localRet = (*pNew->modQueryEtryPt)((uchar*)"activateCnfPrePrivDrop", &pNew->activateCnfPrePrivDrop);
		if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
			pNew->activateCnfPrePrivDrop = NULL;
		} else {
			CHKiRet(localRet);
		}
	} else if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
		pNew->beginCnfLoad = NULL; /* flag as non-present */
	} else {
		ABORT_FINALIZE(localRet);
	}
	/* ... and now the module-specific interfaces */
	switch(pNew->eType) {
		case eMOD_IN:
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"runInput", &pNew->mod.im.runInput));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"willRun", &pNew->mod.im.willRun));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"afterRun", &pNew->mod.im.afterRun));
			pNew->mod.im.bCanRun = 0;
			localRet = (*pNew->modQueryEtryPt)((uchar*)"newInpInst", &pNew->mod.im.newInpInst);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.im.newInpInst = NULL;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}
			break;
		case eMOD_OUT:
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"freeInstance", &pNew->freeInstance));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"dbgPrintInstInfo", &pNew->dbgPrintInstInfo));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"parseSelectorAct", &pNew->mod.om.parseSelectorAct));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"tryResume", &pNew->tryResume));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"createWrkrInstance", &pNew->mod.om.createWrkrInstance));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"freeWrkrInstance", &pNew->mod.om.freeWrkrInstance));

			/* try load optional interfaces */
			localRet = (*pNew->modQueryEtryPt)((uchar*)"doHUP", &pNew->doHUP);
			if(localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
				ABORT_FINALIZE(localRet);

			localRet = (*pNew->modQueryEtryPt)((uchar*)"SetShutdownImmdtPtr", &pNew->mod.om.SetShutdownImmdtPtr);
			if(localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
				ABORT_FINALIZE(localRet);

			pNew->mod.om.supportsTX = 1;
			localRet = (*pNew->modQueryEtryPt)((uchar*)"beginTransaction", &pNew->mod.om.beginTransaction);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.om.beginTransaction = dummyBeginTransaction;
				pNew->mod.om.supportsTX = 0;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}

			localRet = (*pNew->modQueryEtryPt)((uchar*)"doAction",
				   &pNew->mod.om.doAction);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.om.doAction = NULL;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}

			localRet = (*pNew->modQueryEtryPt)((uchar*)"commitTransaction",
				   &pNew->mod.om.commitTransaction);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.om.commitTransaction = NULL;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}

			if(pNew->mod.om.doAction == NULL && pNew->mod.om.commitTransaction == NULL) {
				errmsg.LogError(0, RS_RET_INVLD_OMOD,
					"module %s does neither provide doAction() "
					"nor commitTransaction() interface - cannot "
					"load", name);
				ABORT_FINALIZE(RS_RET_INVLD_OMOD);
			}

			if(pNew->mod.om.commitTransaction != NULL) {
				if(pNew->mod.om.doAction != NULL){
					errmsg.LogError(0, RS_RET_INVLD_OMOD,
						"module %s provides both doAction() "
						"and commitTransaction() interface, using "
						"commitTransaction()", name);
					pNew->mod.om.doAction = NULL;
				}
				if(pNew->mod.om.beginTransaction == NULL){
					errmsg.LogError(0, RS_RET_INVLD_OMOD,
						"module %s provides both commitTransaction() "
						"but does not provide beginTransaction() - "
						"cannot load", name);
					ABORT_FINALIZE(RS_RET_INVLD_OMOD);
				}
			}


			localRet = (*pNew->modQueryEtryPt)((uchar*)"endTransaction",
				   &pNew->mod.om.endTransaction);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.om.endTransaction = dummyEndTransaction;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}

			localRet = (*pNew->modQueryEtryPt)((uchar*)"newActInst", &pNew->mod.om.newActInst);
			if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.om.newActInst = dummynewActInst;
			} else if(localRet != RS_RET_OK) {
				ABORT_FINALIZE(localRet);
			}
			break;
		case eMOD_LIB:
			break;
		case eMOD_PARSER:
			localRet = (*pNew->modQueryEtryPt)((uchar*)"parse2",
				   &pNew->mod.pm.parse2);
			if(localRet == RS_RET_OK) {
				pNew->mod.pm.parse = NULL;
				CHKiRet((*pNew->modQueryEtryPt)((uchar*)"newParserInst",
					&pNew->mod.pm.newParserInst));
				CHKiRet((*pNew->modQueryEtryPt)((uchar*)"freeParserInst",
					&pNew->mod.pm.freeParserInst));
			} else if(localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
				pNew->mod.pm.parse2 = NULL;
				pNew->mod.pm.newParserInst = NULL;
				pNew->mod.pm.freeParserInst = NULL;
				CHKiRet((*pNew->modQueryEtryPt)((uchar*)"parse", &pNew->mod.pm.parse));
			} else {
				ABORT_FINALIZE(localRet);
			}
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"GetParserName", &GetName));
			CHKiRet(GetName(&pName));
			CHKiRet(parserConstructViaModAndName(pNew, pName, NULL));
			break;
		case eMOD_STRGEN:
			/* first, we need to obtain the strgen object. We could not do that during
			 * init as that would have caused class bootstrap issues which are not
			 * absolutely necessary. Note that we can call objUse() multiple times, it
			 * handles that.
			 */
			CHKiRet(objUse(strgen, CORE_COMPONENT));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"strgen", &pNew->mod.sm.strgen));
			CHKiRet((*pNew->modQueryEtryPt)((uchar*)"GetName", &GetName));
			CHKiRet(GetName(&pName));
			CHKiRet(strgen.Construct(&pStrgen));
			CHKiRet(strgen.SetName(pStrgen, pName));
			CHKiRet(strgen.SetModPtr(pStrgen, pNew));
			CHKiRet(strgen.ConstructFinalize(pStrgen));
			break;
		case eMOD_ANY: /* this is mostly to keep the compiler happy! */
			DBGPRINTF("PROGRAM ERROR: eMOD_ANY set as module type\n");
			assert(0);
			break;
	}

	pNew->pszName = (uchar*) strdup((char*)name); /* we do not care if strdup() fails, we can accept that */
	pNew->pModHdlr = pModHdlr;
	if(pModHdlr == NULL) {
		pNew->eLinkType = eMOD_LINK_STATIC;
	} else {
		pNew->eLinkType = eMOD_LINK_DYNAMIC_LOADED;

		/* if we need to keep the linked module, save it */
		if (pNew->eKeepType == eMOD_KEEP) {
			/* see if we have this one already */
			for (pHandle = pHandles; pHandle; pHandle = pHandle->next) {
				if (!strcmp((char *)name, (char *)pHandle->pszName))
					break;
			}

			/* not found, create it */
			if (!pHandle) {
				if((pHandle = malloc(sizeof (*pHandle))) == NULL) {
					ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
				}
				if((pHandle->pszName = (uchar*) strdup((char*)name)) == NULL) {
					free(pHandle);
					ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
				}
				pHandle->pModHdlr = pModHdlr;
				pHandle->next = pHandles;

				pHandles = pHandle;
			}
		}
	}

	/* we initialized the structure, now let's add it to the linked list of modules */
	addModToGlblList(pNew);
	*pNewModule = pNew;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pNew != NULL)
			moduleDestruct(pNew);
		*pNewModule = NULL;
	}

	RETiRet;
}

/* Print loaded modules. This is more or less a 
 * debug or test aid, but anyhow I think it's worth it...
 * This only works if the dbgprintf() subsystem is initialized.
 * TODO: update for new input modules!
 */
static void modPrintList(void)
{
	modInfo_t *pMod;

	pMod = GetNxt(NULL);
	while(pMod != NULL) {
		dbgprintf("Loaded Module: Name='%s', IFVersion=%d, ",
			(char*) modGetName(pMod), pMod->iIFVers);
		dbgprintf("type=");
		switch(pMod->eType) {
		case eMOD_OUT:
			dbgprintf("output");
			break;
		case eMOD_IN:
			dbgprintf("input");
			break;
		case eMOD_LIB:
			dbgprintf("library");
			break;
		case eMOD_PARSER:
			dbgprintf("parser");
			break;
		case eMOD_STRGEN:
			dbgprintf("strgen");
			break;
		case eMOD_ANY: /* this is mostly to keep the compiler happy! */
			DBGPRINTF("PROGRAM ERROR: eMOD_ANY set as module type\n");
			assert(0);
			break;
		}
		dbgprintf(" module.\n");
		dbgprintf("Entry points:\n");
		dbgprintf("\tqueryEtryPt:        0x%lx\n", (unsigned long) pMod->modQueryEtryPt);
		dbgprintf("\tdbgPrintInstInfo:   0x%lx\n", (unsigned long) pMod->dbgPrintInstInfo);
		dbgprintf("\tfreeInstance:       0x%lx\n", (unsigned long) pMod->freeInstance);
		dbgprintf("\tbeginCnfLoad:       0x%lx\n", (unsigned long) pMod->beginCnfLoad);
		dbgprintf("\tSetModCnf:          0x%lx\n", (unsigned long) pMod->setModCnf);
		dbgprintf("\tcheckCnf:           0x%lx\n", (unsigned long) pMod->checkCnf);
		dbgprintf("\tactivateCnfPrePrivDrop: 0x%lx\n", (unsigned long) pMod->activateCnfPrePrivDrop);
		dbgprintf("\tactivateCnf:        0x%lx\n", (unsigned long) pMod->activateCnf);
		dbgprintf("\tfreeCnf:            0x%lx\n", (unsigned long) pMod->freeCnf);
		switch(pMod->eType) {
		case eMOD_OUT:
			dbgprintf("Output Module Entry Points:\n");
			dbgprintf("\tdoAction:           %p\n", pMod->mod.om.doAction);
			dbgprintf("\tparseSelectorAct:   %p\n", pMod->mod.om.parseSelectorAct);
			dbgprintf("\tnewActInst:         %p\n", (pMod->mod.om.newActInst == dummynewActInst) ?
								    NULL :  pMod->mod.om.newActInst);
			dbgprintf("\ttryResume:          %p\n", pMod->tryResume);
			dbgprintf("\tdoHUP:              %p\n", pMod->doHUP);
			dbgprintf("\tBeginTransaction:   %p\n", ((pMod->mod.om.beginTransaction == dummyBeginTransaction) ?
								   NULL :  pMod->mod.om.beginTransaction));
			dbgprintf("\tEndTransaction:     %p\n", ((pMod->mod.om.endTransaction == dummyEndTransaction) ?
								   NULL :  pMod->mod.om.endTransaction));
			break;
		case eMOD_IN:
			dbgprintf("Input Module Entry Points\n");
			dbgprintf("\trunInput:           0x%lx\n", (unsigned long) pMod->mod.im.runInput);
			dbgprintf("\twillRun:            0x%lx\n", (unsigned long) pMod->mod.im.willRun);
			dbgprintf("\tafterRun:           0x%lx\n", (unsigned long) pMod->mod.im.afterRun);
			break;
		case eMOD_LIB:
			break;
		case eMOD_PARSER:
			dbgprintf("Parser Module Entry Points\n");
			dbgprintf("\tparse:              0x%lx\n", (unsigned long) pMod->mod.pm.parse);
			break;
		case eMOD_STRGEN:
			dbgprintf("Strgen Module Entry Points\n");
			dbgprintf("\tstrgen:            0x%lx\n", (unsigned long) pMod->mod.sm.strgen);
			break;
		case eMOD_ANY: /* this is mostly to keep the compiler happy! */
			break;
		}
		dbgprintf("\n");
		pMod = GetNxt(pMod); /* done, go next */
	}
}


/* unlink and destroy a module. The caller must provide a pointer to the module
 * itself as well as one to its immediate predecessor.
 * rgerhards, 2008-02-26
 */
static rsRetVal
modUnlinkAndDestroy(modInfo_t **ppThis)
{
	DEFiRet;
	modInfo_t *pThis;

	assert(ppThis != NULL);
	pThis = *ppThis;
	assert(pThis != NULL);

	pthread_mutex_lock(&mutObjGlobalOp);

	/* first check if we are permitted to unload */
	if(pThis->eType == eMOD_LIB) {
		if(pThis->uRefCnt > 0) {
			dbgprintf("module %s NOT unloaded because it still has a refcount of %u\n",
				  pThis->pszName, pThis->uRefCnt);
#			ifdef DEBUG
			//modUsrPrintAll();
#			endif
			ABORT_FINALIZE(RS_RET_MODULE_STILL_REFERENCED);
		}
	}

	/* we need to unlink the module before we can destruct it -- rgerhards, 2008-02-26 */
	if(pThis->pPrev == NULL) {
		/* module is root, so we need to set a new root */
		pLoadedModules = pThis->pNext;
	} else {
		pThis->pPrev->pNext = pThis->pNext;
	}

	if(pThis->pNext == NULL) {
		pLoadedModulesLast = pThis->pPrev;
	} else {
		pThis->pNext->pPrev = pThis->pPrev;
	}

	/* finally, we are ready for the module to go away... */
	dbgprintf("Unloading module %s\n", modGetName(pThis));
	CHKiRet(modPrepareUnload(pThis));
	*ppThis = pThis->pNext;

	moduleDestruct(pThis);

finalize_it:
	pthread_mutex_unlock(&mutObjGlobalOp);
	RETiRet;
}


/* unload all loaded modules of a specific type (use eMOD_ALL if you want to
 * unload all module types). The unload happens only if the module is no longer
 * referenced. So some modules may survive this call.
 * rgerhards, 2008-03-11
 */
static rsRetVal
modUnloadAndDestructAll(eModLinkType_t modLinkTypesToUnload)
{
	DEFiRet;
	modInfo_t *pModCurr; /* module currently being processed */

	pModCurr = GetNxt(NULL);
	while(pModCurr != NULL) {
		if(modLinkTypesToUnload == eMOD_LINK_ALL || pModCurr->eLinkType == modLinkTypesToUnload) {
			if(modUnlinkAndDestroy(&pModCurr) == RS_RET_MODULE_STILL_REFERENCED) {
				pModCurr = GetNxt(pModCurr);
			} else {
				/* Note: if the module was successfully unloaded, it has updated the
				 * pModCurr pointer to the next module. However, the unload process may
				 * still have indirectly referenced the pointer list in a way that the
				 * unloaded module is not aware of. So we restart the unload process
				 * to make sure we do not fall into a trap (what we did ;)). The
				 * performance toll is minimal. -- rgerhards, 2008-04-28
				 */
				pModCurr = GetNxt(NULL);
			}
		} else {
			pModCurr = GetNxt(pModCurr);
		}
	}

#	ifdef DEBUG
	/* DEV DEBUG only!
		if(pLoadedModules != NULL) {
			dbgprintf("modules still loaded after module.UnloadAndDestructAll:\n");
			modUsrPrintAll();
		}
	*/
#	endif

	RETiRet;
}

/* find module with given name in global list */
static inline rsRetVal
findModule(uchar *pModName, int iModNameLen, modInfo_t **pMod)
{
	modInfo_t *pModInfo;
	uchar *pModNameCmp;
	DEFiRet;

	pModInfo = GetNxt(NULL);
	while(pModInfo != NULL) {
		if(!strncmp((char *) pModName, (char *) (pModNameCmp = modGetName(pModInfo)), iModNameLen) &&
		   (!*(pModNameCmp + iModNameLen) || !strcmp((char *) pModNameCmp + iModNameLen, ".so"))) {
			dbgprintf("Module '%s' found\n", pModName);
			break;
		}
		pModInfo = GetNxt(pModInfo);
	}
	*pMod = pModInfo;
	RETiRet;
}


/* load a module and initialize it, based on doModLoad() from conf.c
 * rgerhards, 2008-03-05
 * varmojfekoj added support for dynamically loadable modules on 2007-08-13
 * rgerhards, 2007-09-25: please note that the non-threadsafe function dlerror() is
 * called below. This is ok because modules are currently only loaded during
 * configuration file processing, which is executed on a single thread. Should we
 * change that design at any stage (what is unlikely), we need to find a
 * replacement.
 * rgerhards, 2011-04-27:
 * Parameter "bConfLoad" tells us if the load was triggered by a config handler, in
 * which case we need to tie the loaded module to the current config. If bConfLoad == 0,
 * the system loads a module for internal reasons, this is not directly tied to a
 * configuration. We could also think if it would be useful to add only certain types
 * of modules, but the current implementation at least looks simpler.
 * Note: pvals = NULL means legacy config system
 */
static rsRetVal
Load(uchar *pModName, sbool bConfLoad, struct nvlst *lst)
{
	size_t iPathLen, iModNameLen;
	int bHasExtension;
        void *pModHdlr, *pModInit;
	modInfo_t *pModInfo;
	cfgmodules_etry_t *pNew;
	cfgmodules_etry_t *pLast;
	uchar *pModDirCurr, *pModDirNext;
	int iLoadCnt;
	struct dlhandle_s *pHandle = NULL;
#	ifdef PATH_MAX
	uchar pathBuf[PATH_MAX+1];
#	else
	uchar pathBuf[4096];
#	endif
	uchar *pPathBuf = pathBuf;
	size_t lenPathBuf = sizeof(pathBuf);
	rsRetVal localRet;
	DEFiRet;

	assert(pModName != NULL);
	DBGPRINTF("Requested to load module '%s'\n", pModName);

	iModNameLen = strlen((char*)pModName);
	/* overhead for a full path is potentially 1 byte for a slash,
	 * three bytes for ".so" and one byte for '\0'.
	 */
#	define PATHBUF_OVERHEAD 1 + iModNameLen + 3 + 1

	pthread_mutex_lock(&mutObjGlobalOp);

	if(iModNameLen > 3 && !strcmp((char *) pModName + iModNameLen - 3, ".so")) {
		iModNameLen -= 3;
		bHasExtension = RSTRUE;
	} else
		bHasExtension = RSFALSE;

	CHKiRet(findModule(pModName, iModNameLen, &pModInfo));
	if(pModInfo != NULL) {
		DBGPRINTF("Module '%s' already loaded\n", pModName);
		if(bConfLoad) {
			localRet = readyModForCnf(pModInfo, &pNew, &pLast);
			if(pModInfo->setModCnf != NULL && localRet == RS_RET_OK) {
				if(!strncmp((char*)pModName, "builtin:", sizeof("builtin:")-1)) {
					if(pModInfo->bSetModCnfCalled) {
						errmsg.LogError(0, RS_RET_DUP_PARAM,
						    "parameters for built-in module %s already set - ignored\n",
						    pModName);
						ABORT_FINALIZE(RS_RET_DUP_PARAM);
					} else {
						/* for built-in moules, we need to call setModConf, 
						 * because there is no way to set parameters at load
						 * time for obvious reasons...
						 */
						if(lst != NULL)
							pModInfo->setModCnf(lst);
						pModInfo->bSetModCnfCalled = 1;
					}
				} else {
					/* regular modules need to be added to conf list (for
					 * builtins, this happend during initial load).
					 */
					addModToCnfList(pNew, pLast);
				}
			}
		}
		FINALIZE;
	}

	pModDirCurr = (uchar *)((pModDir == NULL) ?
		      _PATH_MODDIR : (char *)pModDir);
	pModDirNext = NULL;
	pModHdlr    = NULL;
	iLoadCnt    = 0;
	do {	/* now build our load module name */
		if(*pModName == '/' || *pModName == '.') {
			if(lenPathBuf < PATHBUF_OVERHEAD) {
				if(pPathBuf != pathBuf) /* already malloc()ed memory? */
					free(pPathBuf);
				/* we always alloc enough memory for everything we potentiall need to add */
				lenPathBuf = PATHBUF_OVERHEAD;
				CHKmalloc(pPathBuf = malloc(sizeof(uchar)*lenPathBuf));
			}
			*pPathBuf = '\0';	/* we do not need to append the path - its already in the module name */
			iPathLen = 0;
		} else {
			*pPathBuf = '\0';

			iPathLen = strlen((char *)pModDirCurr);
			pModDirNext = (uchar *)strchr((char *)pModDirCurr, ':');
			if(pModDirNext)
				iPathLen = (size_t)(pModDirNext - pModDirCurr);

			if(iPathLen == 0) {
				if(pModDirNext) {
					pModDirCurr = pModDirNext + 1;
					continue;
				}
				break;
			} else if(iPathLen > lenPathBuf - PATHBUF_OVERHEAD) {
				if(pPathBuf != pathBuf) /* already malloc()ed memory? */
					free(pPathBuf);
				/* we always alloc enough memory for everything we potentiall need to add */
				lenPathBuf = iPathLen + PATHBUF_OVERHEAD;
				CHKmalloc(pPathBuf = malloc(sizeof(uchar)*lenPathBuf));
			}

			memcpy((char *) pPathBuf, (char *)pModDirCurr, iPathLen);
			if((pPathBuf[iPathLen - 1] != '/')) {
				/* we have space, made sure in previous check */
				pPathBuf[iPathLen++] = '/';
			}
			pPathBuf[iPathLen] = '\0';

			if(pModDirNext)
				pModDirCurr = pModDirNext + 1;
		}

		/* ... add actual name ... */
		strncat((char *) pPathBuf, (char *) pModName, lenPathBuf - iPathLen - 1);

		/* now see if we have an extension and, if not, append ".so" */
		if(!bHasExtension) {
			/* we do not have an extension and so need to add ".so"
			 * TODO: I guess this is highly importable, so we should change the
			 * algo over time... -- rgerhards, 2008-03-05
			 */
			strncat((char *) pPathBuf, ".so", lenPathBuf - strlen((char*) pPathBuf) - 1);
		}

		/* complete load path constructed, so ... GO! */
		dbgprintf("loading module '%s'\n", pPathBuf);

		/* see if we have this one already */
		for (pHandle = pHandles; pHandle; pHandle = pHandle->next) {
			if (!strcmp((char *)pModName, (char *)pHandle->pszName)) {
				pModHdlr = pHandle->pModHdlr;
				break;
			}
		}

		/* not found, try to dynamically link it */
		if (!pModHdlr) {
			pModHdlr = dlopen((char *) pPathBuf, RTLD_NOW);
		}

		iLoadCnt++;
	
	} while(pModHdlr == NULL && *pModName != '/' && pModDirNext);

	if(!pModHdlr) {
		if(iLoadCnt) {
			errmsg.LogError(0, RS_RET_MODULE_LOAD_ERR_DLOPEN, "could not load module '%s', dlopen: %s\n",
					pPathBuf, dlerror());
		} else {
			errmsg.LogError(0, NO_ERRCODE, "could not load module '%s', ModDir was '%s'\n", pPathBuf,
			                               ((pModDir == NULL) ? _PATH_MODDIR : (char *)pModDir));
		}
		ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_DLOPEN);
	}
	if(!(pModInit = dlsym(pModHdlr, "modInit"))) {
		errmsg.LogError(0, RS_RET_MODULE_LOAD_ERR_NO_INIT,
			 	"could not load module '%s', dlsym: %s\n", pPathBuf, dlerror());
		dlclose(pModHdlr);
		ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_NO_INIT);
	}
	if((iRet = doModInit(pModInit, (uchar*) pModName, pModHdlr, &pModInfo)) != RS_RET_OK) {
		errmsg.LogError(0, RS_RET_MODULE_LOAD_ERR_INIT_FAILED,
				"could not load module '%s', rsyslog error %d\n", pPathBuf, iRet);
		dlclose(pModHdlr);
		ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_INIT_FAILED);
	}

	if(bConfLoad) {
		readyModForCnf(pModInfo, &pNew, &pLast);
		if(pModInfo->setModCnf != NULL) {
			if(lst != NULL) {
				localRet = pModInfo->setModCnf(lst);
				if(localRet != RS_RET_OK) {
					errmsg.LogError(0, localRet,
						"module '%s', failed processing config parameters",
						pPathBuf);
					abortCnfUse(pNew);
					ABORT_FINALIZE(localRet);
				}
			}
			pModInfo->bSetModCnfCalled = 1;
		}
		addModToCnfList(pNew, pLast);
	}

finalize_it:
	if(pPathBuf != pathBuf) /* used malloc()ed memory? */
		free(pPathBuf);
	pthread_mutex_unlock(&mutObjGlobalOp);
	RETiRet;
}


/* the v6+ way of loading modules: process a "module(...)" directive.
 * rgerhards, 2012-06-20
 */
rsRetVal
modulesProcessCnf(struct cnfobj *o)
{
	struct cnfparamvals *pvals;
	uchar *cnfModName = NULL;
	int typeIdx;
	DEFiRet;

	pvals = nvlstGetParams(o->nvlst, &pblk, NULL);
	if(pvals == NULL) {
		ABORT_FINALIZE(RS_RET_ERR);
	}
	DBGPRINTF("modulesProcessCnf params:\n");
	cnfparamsPrint(&pblk, pvals);
	typeIdx = cnfparamGetIdx(&pblk, "load");
	if(pvals[typeIdx].bUsed == 0) {
		errmsg.LogError(0, RS_RET_CONF_RQRD_PARAM_MISSING, "module type missing");
		ABORT_FINALIZE(RS_RET_CONF_RQRD_PARAM_MISSING);
	}

	cnfModName = (uchar*)es_str2cstr(pvals[typeIdx].val.d.estr, NULL);
	iRet = Load(cnfModName, 1, o->nvlst);
	
finalize_it:
	free(cnfModName);
	cnfparamvalsDestruct(pvals, &pblk);
	RETiRet;
}


/* set the default module load directory. A NULL value may be provided, in
 * which case any previous value is deleted but no new one set. The caller-provided
 * string is duplicated. If it needs to be freed, that's the caller's duty.
 * rgerhards, 2008-03-07
 */
static rsRetVal
SetModDir(uchar *pszModDir)
{
	DEFiRet;

	dbgprintf("setting default module load directory '%s'\n", pszModDir);
	if(pModDir != NULL) {
		free(pModDir);
	}

	pModDir = (uchar*) strdup((char*)pszModDir);

	RETiRet;
}


/* Reference-Counting object access: add 1 to the current reference count. Must be
 * called by anyone interested in using a module. -- rgerhards, 20080-03-10
 */
static rsRetVal
Use(char *srcFile, modInfo_t *pThis)
{
	DEFiRet;

	assert(pThis != NULL);
	pThis->uRefCnt++;
	dbgprintf("source file %s requested reference for module '%s', reference count now %u\n",
		  srcFile, pThis->pszName, pThis->uRefCnt);

#	ifdef DEBUG
	modUsrAdd(pThis, srcFile);
#	endif

	RETiRet;

}


/* Reference-Counting object access: subract one from the current refcount. Must
 * by called by anyone who no longer needs a module. If count reaches 0, the 
 * module is unloaded. -- rgerhards, 20080-03-10
 */
static rsRetVal
Release(char *srcFile, modInfo_t **ppThis)
{
	DEFiRet;
	modInfo_t *pThis;

	assert(ppThis != NULL);
	pThis = *ppThis;
	assert(pThis != NULL);
	if(pThis->uRefCnt == 0) {
		/* oops, we are already at 0? */
		dbgprintf("internal error: module '%s' already has a refcount of 0 (released by %s)!\n",
			  pThis->pszName, srcFile);
	} else {
		--pThis->uRefCnt;
		dbgprintf("file %s released module '%s', reference count now %u\n",
			  srcFile, pThis->pszName, pThis->uRefCnt);
#		ifdef DEBUG
		modUsrDel(pThis, srcFile);
		modUsrPrint(pThis);
#		endif
	}

	if(pThis->uRefCnt == 0) {
		/* we have a zero refcount, so we must unload the module */
		dbgprintf("module '%s' has zero reference count, unloading...\n", pThis->pszName);
		modUnlinkAndDestroy(&pThis);
		/* we must NOT do a *ppThis = NULL, because ppThis now points into freed memory!
		 * If in doubt, see obj.c::ReleaseObj() for how we are called.
		 */
	}

	RETiRet;

}


/* exit our class
 * rgerhards, 2008-03-11
 */
BEGINObjClassExit(module, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(module)
	/* release objects we no longer need */
	objRelease(errmsg, CORE_COMPONENT);
	free(pModDir);
#	ifdef DEBUG
	modUsrPrintAll(); /* debug aid - TODO: integrate with debug.c, at least the settings! */
#	endif
ENDObjClassExit(module)


/* queryInterface function
 * rgerhards, 2008-03-05
 */
BEGINobjQueryInterface(module)
CODESTARTobjQueryInterface(module)
	if(pIf->ifVersion != moduleCURR_IF_VERSION) { /* check for current version, increment on each change */
		ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
	}

	/* ok, we have the right interface, so let's fill it
	 * Please note that we may also do some backwards-compatibility
	 * work here (if we can support an older interface version - that,
	 * of course, also affects the "if" above).
	 */
	pIf->GetNxt = GetNxt;
	pIf->GetNxtCnfType = GetNxtCnfType;
	pIf->GetName = modGetName;
	pIf->GetStateName = modGetStateName;
	pIf->PrintList = modPrintList;
	pIf->FindWithCnfName = FindWithCnfName;
	pIf->UnloadAndDestructAll = modUnloadAndDestructAll;
	pIf->doModInit = doModInit;
	pIf->SetModDir = SetModDir;
	pIf->Load = Load;
	pIf->Use = Use;
	pIf->Release = Release;
finalize_it:
ENDobjQueryInterface(module)


/* Initialize our class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-03-05
 */
BEGINAbstractObjClassInit(module, 1, OBJ_IS_CORE_MODULE) /* class, version - CHANGE class also in END MACRO! */
	uchar *pModPath;

	/* use any module load path specified in the environment */
	if((pModPath = (uchar*) getenv("RSYSLOG_MODDIR")) != NULL) {
		SetModDir(pModPath);
	}

	/* now check if another module path was set via the command line (-M)
	 * if so, that overrides the environment. Please note that we must use
	 * a global setting here because the command line parser can NOT call
	 * into the module object, because it is not initialized at that point. So
	 * instead a global setting is changed and we pick it up as soon as we
	 * initialize -- rgerhards, 2008-04-04
	 */
	if(glblModPath != NULL) {
		SetModDir(glblModPath);
	}

	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
ENDObjClassInit(module)

/* vi:set ai:
 */