summaryrefslogtreecommitdiffstats
path: root/runtime/ruleset.c
blob: 93d40e24dbf42051f7866778f0716f16d9103237 (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
/* ruleset.c - rsyslog's ruleset object
 *
 * We have a two-way structure of linked lists: one global linked list
 * (llAllRulesets) hold alls rule sets that we know. Included in each
 * list is a list of rules (which contain a list of actions, but that's
 * a different story).
 *
 * Usually, only a single rule set is executed. However, there exist some
 * situations where all rules must be iterated over, for example on HUP. Thus,
 * we also provide interfaces to do that.
 *
 * Module begun 2009-06-10 by Rainer Gerhards
 *
 * Copyright 2009 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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>

#include "rsyslog.h"
#include "obj.h"
#include "msg.h"
#include "ruleset.h"
#include "rule.h"
#include "errmsg.h"
#include "unicode-helper.h"

static rsRetVal debugPrintAll(void); // TODO: remove!

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

linkedList_t llRulesets; /* this is NOT a pointer - no typo here ;) */
ruleset_t *pCurrRuleset = NULL; /* currently "active" ruleset */
ruleset_t *pDfltRuleset = NULL; /* currentl default ruleset, e.g. for binding to actions which have no other */

/* ---------- linked-list key handling functions ---------- */

/* destructor for linked list keys.
 */
static rsRetVal keyDestruct(void __attribute__((unused)) *pData)
{
	free(pData);
	return RS_RET_OK;
}


/* ---------- END linked-list key handling functions ---------- */


/* driver to iterate over all of this ruleset actions */
typedef struct iterateAllActions_s {
	rsRetVal (*pFunc)(void*, void*);
	void *pParam;
} iterateAllActions_t;
DEFFUNC_llExecFunc(doIterateRulesetActions)
{
	DEFiRet;
	rule_t* pRule = (rule_t*) pData;
	iterateAllActions_t *pMyParam = (iterateAllActions_t*) pParam;
	iRet = rule.IterateAllActions(pRule, pMyParam->pFunc, pMyParam->pParam);
	RETiRet;
}
#if 0
/* iterate over all actions of THIS rule set.
 */
static rsRetVal
iterateRulesetAllActions(ruleset_t *pThis, rsRetVal (*pFunc)(void*, void*), void* pParam)
{
	iterateAllActions_t params;
	DEFiRet;
	assert(pFunc != NULL);

	params.pFunc = pFunc;
	params.pParam = pParam;
	CHKiRet(llExecFunc(&llRulesets, doIterateRulesetActions, &params));

finalize_it:
	RETiRet;
}


/* driver to iterate over all actions */
DEFFUNC_llExecFunc(doIterateAllActions)
{
	DEFiRet;
	ruleset_t* pThis = (ruleset_t*) pData;
	iterateAllActions_t *pMyParam = (iterateAllActions_t*) pParam;
	iRet = iterateRulesetAllActions(pThis, pMyParam->pFunc, pMyParam->pParam);
	RETiRet;
}
#endif
/* iterate over ALL actions present in the WHOLE system.
 * this is often needed, for example when HUP processing 
 * must be done or a shutdown is pending.
 */
static rsRetVal
iterateAllActions(rsRetVal (*pFunc)(void*, void*), void* pParam)
{
	iterateAllActions_t params;
	DEFiRet;
	assert(pFunc != NULL);

	params.pFunc = pFunc;
	params.pParam = pParam;
	//CHKiRet(llExecFunc(&llRulesets, doIterateAllActions, &params));
	CHKiRet(llExecFunc(&llRulesets, doIterateRulesetActions, &params));

finalize_it:
	RETiRet;
}



/* helper to processMsg(), used to call the configured actions. It is
 * executed from within llExecFunc() of the action list.
 * rgerhards, 2007-08-02
 */
DEFFUNC_llExecFunc(processMsgDoRules)
{
	ISOBJ_TYPE_assert(pData, rule);
	return rule.ProcessMsg((rule_t*) pData, (msg_t*) pParam);
}


/* Process (consume) a received message. Calls the actions configured.
 * rgerhards, 2005-10-13
 */
static rsRetVal
processMsg(msg_t *pMsg)
{
	ruleset_t *pThis;
	DEFiRet;
	assert(pMsg != NULL);

	pThis = (pMsg->pRuleset == NULL) ? pDfltRuleset : pMsg->pRuleset;
	ISOBJ_TYPE_assert(pThis, ruleset);

	CHKiRet(llExecFunc(&pThis->llRules, processMsgDoRules, pMsg));

finalize_it:
	if(iRet == RS_RET_DISCARDMSG)
		iRet = RS_RET_OK;

	RETiRet;
}

/* Add a new rule to the end of the current rule set. We do a number
 * of checks and ignore the rule if it does not pass them.
 */
static rsRetVal
addRule(ruleset_t *pThis, rule_t **ppRule)
{
	int iActionCnt;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, ruleset);
	ISOBJ_TYPE_assert(*ppRule, rule);

	CHKiRet(llGetNumElts(&(*ppRule)->llActList, &iActionCnt));
	if(iActionCnt == 0) {
		errmsg.LogError(0, NO_ERRCODE, "warning: selector line without actions will be discarded");
		rule.Destruct(ppRule);
	} else {
		CHKiRet(llAppend(&pThis->llRules, NULL, *ppRule));
		dbgprintf("selector line successfully processed\n");
	}

finalize_it:
	RETiRet;
}


/* set name for ruleset */
static rsRetVal setName(ruleset_t *pThis, uchar *pszName)
{
	DEFiRet;
	free(pThis->pszName);
	CHKmalloc(pThis->pszName = ustrdup(pszName));

finalize_it:
	RETiRet;
}


/* get current ruleset
 * We use a non-standard calling interface, as nothing can go wrong and it
 * is really much more natural to return the pointer directly.
 */
static ruleset_t*
GetCurrent(void)
{
	return pCurrRuleset;
}


/* Find the ruleset with the given name and return a pointer to its object.
 */
static rsRetVal
GetRuleset(ruleset_t **ppRuleset, uchar *pszName)
{
	DEFiRet;
	assert(ppRuleset != NULL);
	assert(pszName != NULL);

	CHKiRet(llFind(&llRulesets, pszName, (void*) ppRuleset));

finalize_it:
	RETiRet;
}


/* Set a new default rule set. If the default can not be found, no change happens.
 */
static rsRetVal
SetDefaultRuleset(uchar *pszName)
{
	ruleset_t *pRuleset;
	DEFiRet;
	assert(pszName != NULL);

	CHKiRet(GetRuleset(&pRuleset, pszName));
	pDfltRuleset = pRuleset;
	dbgprintf("default rule set changed to %p: '%s'\n", pRuleset, pszName);

finalize_it:
	RETiRet;
}


/* Set a new current rule set. If the ruleset can not be found, no change happens.
 */
static rsRetVal
SetCurrRuleset(uchar *pszName)
{
	ruleset_t *pRuleset;
	DEFiRet;
	assert(pszName != NULL);

	CHKiRet(GetRuleset(&pRuleset, pszName));
	pCurrRuleset = pRuleset;
	dbgprintf("current rule set changed to %p: '%s'\n", pRuleset, pszName);

finalize_it:
	RETiRet;
}


/* destructor we need to destruct rules inside our linked list contents.
 */
static rsRetVal
doRuleDestruct(void *pData)
{
	rule_t *pRule = (rule_t *) pData;
	DEFiRet;
	rule.Destruct(&pRule);
	RETiRet;
}


/* Standard-Constructor
 */
BEGINobjConstruct(ruleset) /* be sure to specify the object type also in END macro! */
	CHKiRet(llInit(&pThis->llRules, doRuleDestruct, NULL, NULL));
finalize_it:
ENDobjConstruct(ruleset)


/* ConstructionFinalizer
 * This also adds the rule set to the list of all known rulesets.
 */
static rsRetVal
rulesetConstructFinalize(ruleset_t *pThis)
{
	uchar *keyName;
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, ruleset);

	/* we must duplicate our name, as the key destructer would also
	 * free it, resulting in a double-free. It's also cleaner to have
	 * two separate copies.
	 */
	CHKmalloc(keyName = ustrdup(pThis->pszName));
	CHKiRet(llAppend(&llRulesets, keyName, pThis));

	/* this now also is the new current ruleset */
	pCurrRuleset = pThis;

	/* and also the default, if so far none has been set */
	if(pDfltRuleset == NULL)
		pDfltRuleset = pThis;

finalize_it:
	RETiRet;
}


/* destructor for the ruleset object */
BEGINobjDestruct(ruleset) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(ruleset)
	dbgprintf("destructing ruleset %p, name %p\n", pThis, pThis->pszName);
	llDestroy(&pThis->llRules);
	free(pThis->pszName);
ENDobjDestruct(ruleset)

/* this is a special destructor for the linkedList class. LinkedList does NOT
 * provide a pointer to the pointer, but rather the raw pointer itself. So we 
 * must map this, otherwise the destructor will abort.
 */
static rsRetVal
rulesetDestructForLinkedList(void *pData)
{
	ruleset_t *pThis = (ruleset_t*) pData;
	return rulesetDestruct(&pThis);
}


/* destruct ALL rule sets that reside in the system. This must
 * be callable before unloading this module as the module may
 * not be unloaded before unload of the actions is required. This is
 * kind of a left-over from previous logic and may be optimized one
 * everything runs stable again. -- rgerhards, 2009-06-10
 */
static rsRetVal
destructAllActions(void)
{
	DEFiRet;

	CHKiRet(llDestroy(&llRulesets));
	CHKiRet(llInit(&llRulesets, rulesetDestructForLinkedList, keyDestruct, strcasecmp));

finalize_it:
	RETiRet;
}

/* helper for debugPrint(), initiates rule printing */
DEFFUNC_llExecFunc(doDebugPrintRule)
{
	return rule.DebugPrint((rule_t*) pData);
}
/* debugprint for the ruleset object */
BEGINobjDebugPrint(ruleset) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDebugPrint(ruleset)
	dbgoprint((obj_t*) pThis, "rsyslog ruleset %s:\n", pThis->pszName);
	llExecFunc(&pThis->llRules, doDebugPrintRule, NULL);
ENDobjDebugPrint(ruleset)


/* helper for debugPrintAll(), prints a single ruleset */
DEFFUNC_llExecFunc(doDebugPrintAll)
{
	return rulesetDebugPrint((ruleset_t*) pData);
}
/* debug print all rulesets
 */
static rsRetVal
debugPrintAll(void)
{
	DEFiRet;
	dbgprintf("All Rulesets:\n");
	llExecFunc(&llRulesets, doDebugPrintAll, NULL);
	dbgprintf("End of Rulesets.\n");
	RETiRet;
}


/* queryInterface function
 * rgerhards, 2008-02-21
 */
BEGINobjQueryInterface(ruleset)
CODESTARTobjQueryInterface(ruleset)
	if(pIf->ifVersion != rulesetCURR_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->Construct = rulesetConstruct;
	pIf->ConstructFinalize = rulesetConstructFinalize;
	pIf->Destruct = rulesetDestruct;
	pIf->DebugPrint = rulesetDebugPrint;

	pIf->IterateAllActions = iterateAllActions;
	pIf->DestructAllActions = destructAllActions;
	pIf->AddRule = addRule;
	pIf->ProcessMsg = processMsg;
	pIf->SetName = setName;
	pIf->DebugPrintAll = debugPrintAll;
	pIf->GetCurrent = GetCurrent;
	pIf->GetRuleset = GetRuleset;
	pIf->SetDefaultRuleset = SetDefaultRuleset;
	pIf->SetCurrRuleset = SetCurrRuleset;
finalize_it:
ENDobjQueryInterface(ruleset)


/* Exit the ruleset class.
 * rgerhards, 2009-04-06
 */
BEGINObjClassExit(ruleset, OBJ_IS_CORE_MODULE) /* class, version */
	llDestroy(&llRulesets);
	objRelease(errmsg, CORE_COMPONENT);
	objRelease(rule, CORE_COMPONENT);
ENDObjClassExit(ruleset)


/* Initialize the ruleset class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-02-19
 */
BEGINObjClassInit(ruleset, 1, OBJ_IS_CORE_MODULE) /* class, version */
	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
	CHKiRet(objUse(rule, CORE_COMPONENT));

	/* set our own handlers */
	OBJSetMethodHandler(objMethod_DEBUGPRINT, rulesetDebugPrint);
	OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, rulesetConstructFinalize);

	/* prepare global data */
	CHKiRet(llInit(&llRulesets, rulesetDestructForLinkedList, keyDestruct, strcasecmp));
ENDObjClassInit(ruleset)

/* vi:set ai:
 */