summaryrefslogtreecommitdiff
path: root/plugins/imudp/imudp.c
blob: 312645bd16fa83cfd8225738e59853522e1a3092 (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
/* imudp.c
 * This is the implementation of the UDP input module.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * Copyright 2007-2012 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>
#if HAVE_SYS_EPOLL_H
#	include <sys/epoll.h>
#endif
#ifdef HAVE_SCHED_H
#	include <sched.h>
#endif
#include "rsyslog.h"
#include "dirty.h"
#include "net.h"
#include "cfsysline.h"
#include "module-template.h"
#include "srUtils.h"
#include "errmsg.h"
#include "glbl.h"
#include "msg.h"
#include "parser.h"
#include "datetime.h"
#include "prop.h"
#include "ruleset.h"
#include "statsobj.h"
#include "ratelimit.h"
#include "unicode-helper.h"

MODULE_TYPE_INPUT
MODULE_TYPE_NOKEEP
MODULE_CNFNAME("imudp")

/* defines */

/* Module static data */
DEF_IMOD_STATIC_DATA
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
DEFobjCurrIf(net)
DEFobjCurrIf(datetime)
DEFobjCurrIf(prop)
DEFobjCurrIf(ruleset)
DEFobjCurrIf(statsobj)


static struct lstn_s {
	struct lstn_s *next;
	int sock;		/* socket */
	ruleset_t *pRuleset;	/* bound ruleset */
	prop_t *pInputName;
	statsobj_t *stats;	/* listener stats */
	ratelimit_t *ratelimiter;
	STATSCOUNTER_DEF(ctrSubmit, mutCtrSubmit)
} *lcnfRoot = NULL, *lcnfLast = NULL;

static int bLegacyCnfModGlobalsPermitted;/* are legacy module-global config parameters permitted? */
static int bDoACLCheck;			/* are ACL checks neeed? Cached once immediately before listener startup */
static int iMaxLine;			/* maximum UDP message size supported */
static time_t ttLastDiscard = 0;	/* timestamp when a message from a non-permitted sender was last discarded
					 * This shall prevent remote DoS when the "discard on disallowed sender"
					 * message is configured to be logged on occurance of such a case.
					 */
static uchar *pRcvBuf = NULL;		/* receive buffer (for a single packet). We use a global and alloc
					 * it so that we can check available memory in willRun() and request
					 * termination if we can not get it. -- rgerhards, 2007-12-27
					 */

#define TIME_REQUERY_DFLT 2
#define SCHED_PRIO_UNSET -12345678	/* a value that indicates that the scheduling priority has not been set */
/* config vars for legacy config system */
static struct configSettings_s {
	uchar *pszBindAddr;		/* IP to bind socket to */
	uchar *pszSchedPolicy;		/* scheduling policy string */
	uchar *pszBindRuleset;		/* name of Ruleset to bind to */
	int iSchedPrio;			/* scheduling priority */
	int iTimeRequery;		/* how often is time to be queried inside tight recv loop? 0=always */
} cs;

struct instanceConf_s {
	uchar *pszBindAddr;		/* IP to bind socket to */
	uchar *pszBindPort;		/* Port to bind socket to */
	uchar *pszBindRuleset;		/* name of ruleset to bind to */
	uchar *inputname;
	ruleset_t *pBindRuleset;	/* ruleset to bind listener to (use system default if unspecified) */
	int ratelimitInterval;
	int ratelimitBurst;
	struct instanceConf_s *next;
	sbool bAppendPortToInpname;
};

struct modConfData_s {
	rsconf_t *pConf;		/* our overall config object */
	instanceConf_t *root, *tail;
	uchar *pszSchedPolicy;		/* scheduling policy string */
	int iSchedPolicy;		/* scheduling policy as SCHED_xxx */
	int iSchedPrio;			/* scheduling priority */
	int iTimeRequery;		/* how often is time to be queried inside tight recv loop? 0=always */
	sbool configSetViaV2Method;
};
static modConfData_t *loadModConf = NULL;/* modConf ptr to use for the current load process */
static modConfData_t *runModConf = NULL;/* modConf ptr to use for the current load process */

/* module-global parameters */
static struct cnfparamdescr modpdescr[] = {
	{ "schedulingpolicy", eCmdHdlrGetWord, 0 },
	{ "schedulingpriority", eCmdHdlrInt, 0 },
	{ "timerequery", eCmdHdlrInt, 0 }
};
static struct cnfparamblk modpblk =
	{ CNFPARAMBLK_VERSION,
	  sizeof(modpdescr)/sizeof(struct cnfparamdescr),
	  modpdescr
	};

/* input instance parameters */
static struct cnfparamdescr inppdescr[] = {
	{ "port", eCmdHdlrArray, CNFPARAM_REQUIRED }, /* legacy: InputTCPServerRun */
	{ "inputname", eCmdHdlrGetWord, 0 },
	{ "inputname.appendport", eCmdHdlrBinary, 0 },
	{ "address", eCmdHdlrString, 0 },
	{ "ruleset", eCmdHdlrString, 0 },
	{ "ratelimit.interval", eCmdHdlrInt, 0 },
	{ "ratelimit.burst", eCmdHdlrInt, 0 }
};
static struct cnfparamblk inppblk =
	{ CNFPARAMBLK_VERSION,
	  sizeof(inppdescr)/sizeof(struct cnfparamdescr),
	  inppdescr
	};

#include "im-helper.h" /* must be included AFTER the type definitions! */

/* create input instance, set default paramters, and
 * add it to the list of instances.
 */
static rsRetVal
createInstance(instanceConf_t **pinst)
{
	instanceConf_t *inst;
	DEFiRet;
	CHKmalloc(inst = MALLOC(sizeof(instanceConf_t)));
	inst->next = NULL;
	inst->pBindRuleset = NULL;

	inst->pszBindPort = NULL;
	inst->pszBindAddr = NULL;
	inst->pszBindRuleset = NULL;
	inst->inputname = NULL;
	inst->bAppendPortToInpname = 0;
	inst->ratelimitBurst = 10000; /* arbitrary high limit */
	inst->ratelimitInterval = 0; /* off */

	/* node created, let's add to config */
	if(loadModConf->tail == NULL) {
		loadModConf->tail = loadModConf->root = inst;
	} else {
		loadModConf->tail->next = inst;
		loadModConf->tail = inst;
	}

	*pinst = inst;
finalize_it:
	RETiRet;
}

/* This function is called when a new listener instace shall be added to 
 * the current config object via the legacy config system. It just shuffles
 * all parameters to the listener in-memory instance.
 * rgerhards, 2011-05-04
 */
static rsRetVal addInstance(void __attribute__((unused)) *pVal, uchar *pNewVal)
{
	instanceConf_t *inst;
	DEFiRet;

	CHKiRet(createInstance(&inst));
	CHKmalloc(inst->pszBindPort = ustrdup((pNewVal == NULL || *pNewVal == '\0')
				 	       ? (uchar*) "514" : pNewVal));
	if((cs.pszBindAddr == NULL) || (cs.pszBindAddr[0] == '\0')) {
		inst->pszBindAddr = NULL;
	} else {
		CHKmalloc(inst->pszBindAddr = ustrdup(cs.pszBindAddr));
	}
	if((cs.pszBindRuleset == NULL) || (cs.pszBindRuleset[0] == '\0')) {
		inst->pszBindRuleset = NULL;
	} else {
		CHKmalloc(inst->pszBindRuleset = ustrdup(cs.pszBindRuleset));
	}

finalize_it:
	free(pNewVal);
	RETiRet;
}


/* This function is called when a new listener shall be added. It takes
 * the instance config description, tries to bind the socket and, if that
 * succeeds, adds it to the list of existing listen sockets.
 */
static inline rsRetVal
addListner(instanceConf_t *inst)
{
	DEFiRet;
	uchar *bindAddr;
	int *newSocks;
	int iSrc;
	struct lstn_s *newlcnfinfo;
	uchar *bindName;
	uchar *port;
	uchar dispname[64], inpnameBuf[128];
	uchar *inputname;

	/* check which address to bind to. We could do this more compact, but have not
	 * done so in order to make the code more readable. -- rgerhards, 2007-12-27
	 */
	if(inst->pszBindAddr == NULL)
		bindAddr = NULL;
	else if(inst->pszBindAddr[0] == '*' && inst->pszBindAddr[1] == '\0')
		bindAddr = NULL;
	else
		bindAddr = inst->pszBindAddr;
	bindName = (bindAddr == NULL) ? (uchar*)"*" : bindAddr;
	port = (inst->pszBindPort == NULL || *inst->pszBindPort == '\0') ? (uchar*) "514" : inst->pszBindPort;

	DBGPRINTF("Trying to open syslog UDP ports at %s:%s.\n", bindName, inst->pszBindPort);

	newSocks = net.create_udp_socket(bindAddr, port, 1);
	if(newSocks != NULL) {
		/* we now need to add the new sockets to the existing set */
		/* ready to copy */
		for(iSrc = 1 ; iSrc <= newSocks[0] ; ++iSrc) {
			CHKmalloc(newlcnfinfo = (struct lstn_s*) MALLOC(sizeof(struct lstn_s)));
			newlcnfinfo->next = NULL;
			newlcnfinfo->sock = newSocks[iSrc];
			newlcnfinfo->pRuleset = inst->pBindRuleset;
			snprintf((char*)dispname, sizeof(dispname), "imudp(%s:%s)", bindName, port);
			dispname[sizeof(dispname)-1] = '\0'; /* just to be on the save side... */
			CHKiRet(ratelimitNew(&newlcnfinfo->ratelimiter, (char*)dispname, NULL));
			if(inst->inputname == NULL) {
				inputname = (uchar*)"imudp";
			} else {
				inputname = inst->inputname;
			}
			if(inst->bAppendPortToInpname) {
				snprintf((char*)inpnameBuf, sizeof(inpnameBuf), "%s%s",
					inputname, port);
				inpnameBuf[sizeof(inpnameBuf)-1] = '\0';
				inputname = inpnameBuf;
			}
			CHKiRet(prop.Construct(&newlcnfinfo->pInputName));
			CHKiRet(prop.SetString(newlcnfinfo->pInputName,
				inputname, ustrlen(inputname)));
			CHKiRet(prop.ConstructFinalize(newlcnfinfo->pInputName));
			ratelimitSetLinuxLike(newlcnfinfo->ratelimiter, inst->ratelimitInterval,
					      inst->ratelimitBurst);
			/* support statistics gathering */
			CHKiRet(statsobj.Construct(&(newlcnfinfo->stats)));
			CHKiRet(statsobj.SetName(newlcnfinfo->stats, dispname));
			STATSCOUNTER_INIT(newlcnfinfo->ctrSubmit, newlcnfinfo->mutCtrSubmit);
			CHKiRet(statsobj.AddCounter(newlcnfinfo->stats, UCHAR_CONSTANT("submitted"),
				ctrType_IntCtr, &(newlcnfinfo->ctrSubmit)));
			CHKiRet(statsobj.ConstructFinalize(newlcnfinfo->stats));
			/* link to list. Order must be preserved to take care for 
			 * conflicting matches.
			 */
			if(lcnfRoot == NULL)
				lcnfRoot = newlcnfinfo;
			if(lcnfLast == NULL)
				lcnfLast = newlcnfinfo;
			else {
				lcnfLast->next = newlcnfinfo;
				lcnfLast = newlcnfinfo;
			}
		}
	}

finalize_it:
	free(newSocks);
	RETiRet;
}


static inline void
std_checkRuleset_genErrMsg(__attribute__((unused)) modConfData_t *modConf, instanceConf_t *inst)
{
	errmsg.LogError(0, NO_ERRCODE, "imudp: ruleset '%s' for %s:%s not found - "
			"using default ruleset instead", inst->pszBindRuleset,
			inst->pszBindAddr == NULL ? "*" : (char*) inst->pszBindAddr,
			inst->pszBindPort);
}


/* This function is a helper to runInput. I have extracted it
 * from the main loop just so that we do not have that large amount of code
 * in a single place. This function takes a socket and pulls messages from
 * it until the socket does not have any more waiting.
 * rgerhards, 2008-01-08
 * We try to read from the file descriptor until there
 * is no more data. This is done in the hope to get better performance
 * out of the system. However, this also means that a descriptor
 * monopolizes processing while it contains data. This can lead to
 * data loss in other descriptors. However, if the system is incapable of
 * handling the workload, we will loss data in any case. So it doesn't really
 * matter where the actual loss occurs - it is always random, because we depend
 * on scheduling order. -- rgerhards, 2008-10-02
 */
static inline rsRetVal
processSocket(thrdInfo_t *pThrd, struct lstn_s *lstn, struct sockaddr_storage *frominetPrev, int *pbIsPermitted)
{
	int iNbrTimeUsed;
	time_t ttGenTime;
	struct syslogTime stTime;
	socklen_t socklen;
	ssize_t lenRcvBuf;
	struct sockaddr_storage frominet;
	msg_t *pMsg;
	prop_t *propFromHost = NULL;
	prop_t *propFromHostIP = NULL;
	multi_submit_t multiSub;
	msg_t *pMsgs[CONF_NUM_MULTISUB];
	char errStr[1024];
	DEFiRet;

	assert(pThrd != NULL);
	multiSub.ppMsgs = pMsgs;
	multiSub.maxElem = CONF_NUM_MULTISUB;
	multiSub.nElem = 0;
	iNbrTimeUsed = 0;
	while(1) { /* loop is terminated if we have a bad receive, done below in the body */
		if(pThrd->bShallStop == RSTRUE)
			ABORT_FINALIZE(RS_RET_FORCE_TERM);
		socklen = sizeof(struct sockaddr_storage);
		lenRcvBuf = recvfrom(lstn->sock, (char*) pRcvBuf, iMaxLine, 0, (struct sockaddr *)&frominet, &socklen);
		if(lenRcvBuf < 0) {
			if(errno != EINTR && errno != EAGAIN) {
				rs_strerror_r(errno, errStr, sizeof(errStr));
				DBGPRINTF("INET socket error: %d = %s.\n", errno, errStr);
				errmsg.LogError(errno, NO_ERRCODE, "recvfrom inet");
			}
			ABORT_FINALIZE(RS_RET_ERR); // this most often is NOT an error, state is not checked by caller!
		}

		if(lenRcvBuf == 0)
			continue; /* this looks a bit strange, but practice shows it happens... */

		/* if we reach this point, we had a good receive and can process the packet received */
		/* check if we have a different sender than before, if so, we need to query some new values */
		if(bDoACLCheck) {
			if(net.CmpHost(&frominet, frominetPrev, socklen) != 0) {
				memcpy(frominetPrev, &frominet, socklen); /* update cache indicator */
				/* Here we check if a host is permitted to send us syslog messages. If it isn't,
				 * we do not further process the message but log a warning (if we are
				 * configured to do this). However, if the check would require name resolution,
				 * it is postponed to the main queue. See also my blog post at
				 * http://blog.gerhards.net/2009/11/acls-imudp-and-accepting-messages.html
				 * rgerhards, 2009-11-16
				 */
				*pbIsPermitted = net.isAllowedSender2((uchar*)"UDP",
						    (struct sockaddr *)&frominet, "", 0);
		
				if(*pbIsPermitted == 0) {
					DBGPRINTF("msg is not from an allowed sender\n");
					if(glbl.GetOption_DisallowWarning) {
						time_t tt;
						datetime.GetTime(&tt);
						if(tt > ttLastDiscard + 60) {
							ttLastDiscard = tt;
							errmsg.LogError(0, NO_ERRCODE,
							"UDP message from disallowed sender discarded");
						}
					}
				}
			}
		} else {
			*pbIsPermitted = 1; /* no check -> everything permitted */
		}

		DBGPRINTF("imudp:recv(%d,%d),acl:%d,msg:%s\n", lstn->sock, (int) lenRcvBuf, *pbIsPermitted, pRcvBuf);

		if(*pbIsPermitted != 0)  {
			if((runModConf->iTimeRequery == 0) || (iNbrTimeUsed++ % runModConf->iTimeRequery) == 0) {
				datetime.getCurrTime(&stTime, &ttGenTime);
			}
			/* we now create our own message object and submit it to the queue */
			CHKiRet(msgConstructWithTime(&pMsg, &stTime, ttGenTime));
			MsgSetRawMsg(pMsg, (char*)pRcvBuf, lenRcvBuf);
			MsgSetInputName(pMsg, lstn->pInputName);
			MsgSetRuleset(pMsg, lstn->pRuleset);
			MsgSetFlowControlType(pMsg, eFLOWCTL_NO_DELAY);
			pMsg->msgFlags  = NEEDS_PARSING | PARSE_HOSTNAME | NEEDS_DNSRESOL;
			if(*pbIsPermitted == 2)
				pMsg->msgFlags  |= NEEDS_ACLCHK_U; /* request ACL check after resolution */
			CHKiRet(msgSetFromSockinfo(pMsg, &frominet));
			CHKiRet(ratelimitAddMsg(lstn->ratelimiter, &multiSub, pMsg));
			STATSCOUNTER_INC(lstn->ctrSubmit, lstn->mutCtrSubmit);
		}
	}


finalize_it:
	multiSubmitFlush(&multiSub);

	if(propFromHost != NULL)
		prop.Destruct(&propFromHost);
	if(propFromHostIP != NULL)
		prop.Destruct(&propFromHostIP);

	RETiRet;
}


/* check configured scheduling priority.
 * Precondition: iSchedPolicy must have been set
 */
static inline rsRetVal
checkSchedulingPriority(modConfData_t *modConf)
{
    	DEFiRet;

#ifdef HAVE_SCHED_GET_PRIORITY_MAX
	if(   modConf->iSchedPrio < sched_get_priority_min(modConf->iSchedPolicy)
	   || modConf->iSchedPrio > sched_get_priority_max(modConf->iSchedPolicy)) {
		errmsg.LogError(0, NO_ERRCODE,
			"imudp: scheduling priority %d out of range (%d - %d)"
			" for scheduling policy '%s' - ignoring settings",
			modConf->iSchedPrio,
			sched_get_priority_min(modConf->iSchedPolicy),
			sched_get_priority_max(modConf->iSchedPolicy),
			modConf->pszSchedPolicy);
		ABORT_FINALIZE(RS_RET_VALIDATION_RUN);
	}
#endif

finalize_it:
	RETiRet;
}


/* check scheduling policy string and, if valid, set its 
 * numeric equivalent in current load config
 */
static rsRetVal
checkSchedulingPolicy(modConfData_t *modConf)
{
	DEFiRet;

	if (0) { /* trick to use conditional compilation */
#ifdef SCHED_FIFO
	} else if (!strcasecmp((char*)modConf->pszSchedPolicy, "fifo")) {
		modConf->iSchedPolicy = SCHED_FIFO;
#endif
#ifdef SCHED_RR
	} else if (!strcasecmp((char*)modConf->pszSchedPolicy, "rr")) {
		modConf->iSchedPolicy = SCHED_RR;
#endif
#ifdef SCHED_OTHER
	} else if (!strcasecmp((char*)modConf->pszSchedPolicy, "other")) {
		modConf->iSchedPolicy = SCHED_OTHER;
#endif
	} else {
		errmsg.LogError(errno, NO_ERRCODE,
			    "imudp: invalid scheduling policy '%s' "
			    "- ignoring setting", modConf->pszSchedPolicy);
		ABORT_FINALIZE(RS_RET_ERR_SCHED_PARAMS);
	}
finalize_it:
	RETiRet;
}

/* checks scheduling parameters during config check phase */
static rsRetVal
checkSchedParam(modConfData_t *modConf)
{
	DEFiRet;

	if(modConf->pszSchedPolicy != NULL && modConf->iSchedPrio == SCHED_PRIO_UNSET) {
		errmsg.LogError(0, RS_RET_ERR_SCHED_PARAMS,
			"imudp: scheduling policy set, but without priority - ignoring settings");
		ABORT_FINALIZE(RS_RET_ERR_SCHED_PARAMS);
	} else if(modConf->pszSchedPolicy == NULL && modConf->iSchedPrio != SCHED_PRIO_UNSET) {
		errmsg.LogError(0, RS_RET_ERR_SCHED_PARAMS,
			"imudp: scheduling priority set, but without policy - ignoring settings");
		ABORT_FINALIZE(RS_RET_ERR_SCHED_PARAMS);
	} else if(modConf->pszSchedPolicy != NULL && modConf->iSchedPrio != SCHED_PRIO_UNSET) {
		/* we have parameters set, so check them */
		CHKiRet(checkSchedulingPolicy(modConf));
		CHKiRet(checkSchedulingPriority(modConf));
	} else { /* nothing set */
		modConf->iSchedPrio = SCHED_PRIO_UNSET; /* prevents doing the activation call */
	}
#ifndef HAVE_PTHREAD_SETSCHEDPARAM
	errmsg.LogError(0, NO_ERRCODE,
		"imudp: cannot set thread scheduling policy, "
		"pthread_setschedparam() not available");
	ABORT_FINALIZE(RS_RET_ERR_SCHED_PARAMS);
#endif

finalize_it:
	if(iRet != RS_RET_OK)
		modConf->iSchedPrio = SCHED_PRIO_UNSET; /* prevents doing the activation call */

	RETiRet;
}

/* set the configured scheduling policy (if possible) */
static rsRetVal
setSchedParams(modConfData_t *modConf)
{
	DEFiRet;

#	ifdef HAVE_PTHREAD_SETSCHEDPARAM
	int err;
	struct sched_param sparam;

	if(modConf->iSchedPrio == SCHED_PRIO_UNSET)
		FINALIZE;

	memset(&sparam, 0, sizeof sparam);
	sparam.sched_priority = modConf->iSchedPrio;
	dbgprintf("imudp trying to set sched policy to '%s', prio %d\n",
		  modConf->pszSchedPolicy, modConf->iSchedPrio);
	err = pthread_setschedparam(pthread_self(), modConf->iSchedPolicy, &sparam);
	if(err != 0) {
		errmsg.LogError(err, NO_ERRCODE, "imudp: pthread_setschedparam() failed - ignoring");
	}
#	endif

finalize_it:
	RETiRet;
}


/* This function implements the main reception loop. Depending on the environment,
 * we either use the traditional (but slower) select() or the Linux-specific epoll()
 * interface. ./configure settings control which one is used.
 * rgerhards, 2009-09-09
 */
#if defined(HAVE_EPOLL_CREATE1) || defined(HAVE_EPOLL_CREATE)
#define NUM_EPOLL_EVENTS 10
rsRetVal rcvMainLoop(thrdInfo_t *pThrd)
{
	DEFiRet;
	int nfds;
	int efd;
	int i;
	struct sockaddr_storage frominetPrev;
	int bIsPermitted;
	struct epoll_event *udpEPollEvt = NULL;
	struct epoll_event currEvt[NUM_EPOLL_EVENTS];
	char errStr[1024];
	struct lstn_s *lstn;
	int nLstn;

	/* start "name caching" algo by making sure the previous system indicator
	 * is invalidated.
	 */
	bIsPermitted = 0;
	memset(&frominetPrev, 0, sizeof(frominetPrev));

	/* count num listeners -- do it here in order to avoid inconsistency */
	nLstn = 0;
	for(lstn = lcnfRoot ; lstn != NULL ; lstn = lstn->next)
		++nLstn;
	CHKmalloc(udpEPollEvt = calloc(nLstn, sizeof(struct epoll_event)));

#if defined(EPOLL_CLOEXEC) && defined(HAVE_EPOLL_CREATE1)
	DBGPRINTF("imudp uses epoll_create1()\n");
	efd = epoll_create1(EPOLL_CLOEXEC);
	if(efd < 0 && errno == ENOSYS)
#endif
	{
		DBGPRINTF("imudp uses epoll_create()\n");
		efd = epoll_create(NUM_EPOLL_EVENTS);
	}

	if(efd < 0) {
		DBGPRINTF("epoll_create1() could not create fd\n");
		ABORT_FINALIZE(RS_RET_IO_ERROR);
	}

	/* fill the epoll set - we need to do this only once, as the set
	 * can not change dyamically.
	 */
	i = 0;
	for(lstn = lcnfRoot ; lstn != NULL ; lstn = lstn->next) {
		if(lstn->sock != -1) {
			udpEPollEvt[i].events = EPOLLIN | EPOLLET;
			udpEPollEvt[i].data.ptr = lstn;
			if(epoll_ctl(efd, EPOLL_CTL_ADD,  lstn->sock, &(udpEPollEvt[i])) < 0) {
				rs_strerror_r(errno, errStr, sizeof(errStr));
				errmsg.LogError(errno, NO_ERRCODE, "epoll_ctrl failed on fd %d with %s\n",
					lstn->sock, errStr);
			}
		}
		i++;
	}

	while(1) {
		/* wait for io to become ready */
		nfds = epoll_wait(efd, currEvt, NUM_EPOLL_EVENTS, -1);
		DBGPRINTF("imudp: epoll_wait() returned with %d fds\n", nfds);

		if(pThrd->bShallStop == RSTRUE)
			break; /* terminate input! */

		for(i = 0 ; i < nfds ; ++i) {
			processSocket(pThrd, currEvt[i].data.ptr, &frominetPrev, &bIsPermitted);
		}
	}

finalize_it:
	if(udpEPollEvt != NULL)
		free(udpEPollEvt);

	RETiRet;
}
#else /* #if HAVE_EPOLL_CREATE1 */
/* this is the code for the select() interface */
rsRetVal rcvMainLoop(thrdInfo_t *pThrd)
{
	DEFiRet;
	int maxfds;
	int nfds;
	fd_set readfds;
	struct sockaddr_storage frominetPrev;
	int bIsPermitted;
	struct lstn_s *lstn;

	/* start "name caching" algo by making sure the previous system indicator
	 * is invalidated.
	 */
	bIsPermitted = 0;
	memset(&frominetPrev, 0, sizeof(frominetPrev));
	DBGPRINTF("imudp uses select()\n");

	while(1) {
		/* Add the Unix Domain Sockets to the list of read descriptors.
		 */
	        maxfds = 0;
	        FD_ZERO(&readfds);

		/* Add the UDP listen sockets to the list of read descriptors. */
		for(lstn = lcnfRoot ; lstn != NULL ; lstn = lstn->next) {
			if (lstn->sock != -1) {
				if(Debug)
					net.debugListenInfo(lstn->sock, "UDP");
				FD_SET(lstn->sock, &readfds);
				if(lstn->sock>maxfds) maxfds=lstn->sock;
			}
		}
		if(Debug) {
			dbgprintf("--------imUDP calling select, active file descriptors (max %d): ", maxfds);
			for (nfds = 0; nfds <= maxfds; ++nfds)
				if(FD_ISSET(nfds, &readfds))
					dbgprintf("%d ", nfds);
			dbgprintf("\n");
		}

		/* wait for io to become ready */
		nfds = select(maxfds+1, (fd_set *) &readfds, NULL, NULL, NULL);
		if(glbl.GetGlobalInputTermState() == 1)
			break; /* terminate input! */

		for(lstn = lcnfRoot ; nfds && lstn != NULL ; lstn = lstn->next) {
			if(FD_ISSET(lstn->sock, &readfds)) {
		       		processSocket(pThrd, lstn, &frominetPrev, &bIsPermitted);
			--nfds; /* indicate we have processed one descriptor */
			}
	       }
	       /* end of a run, back to loop for next recv() */
	}

	RETiRet;
}
#endif /* #if HAVE_EPOLL_CREATE1 */


static inline rsRetVal
createListner(es_str_t *port, struct cnfparamvals *pvals)
{
	instanceConf_t *inst;
	int i;
	DEFiRet;

	CHKiRet(createInstance(&inst));
	inst->pszBindPort = (uchar*)es_str2cstr(port, NULL);
	for(i = 0 ; i < inppblk.nParams ; ++i) {
		if(!pvals[i].bUsed)
			continue;
		if(!strcmp(inppblk.descr[i].name, "port")) {
			continue;	/* array, handled by caller */
		} else if(!strcmp(inppblk.descr[i].name, "inputname")) {
			inst->inputname = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
		} else if(!strcmp(inppblk.descr[i].name, "inputname.appendport")) {
			inst->bAppendPortToInpname = (int) pvals[i].val.d.n;
		} else if(!strcmp(inppblk.descr[i].name, "address")) {
			inst->pszBindAddr = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
		} else if(!strcmp(inppblk.descr[i].name, "ruleset")) {
			inst->pszBindRuleset = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
		} else if(!strcmp(inppblk.descr[i].name, "ratelimit.burst")) {
			inst->ratelimitBurst = (int) pvals[i].val.d.n;
		} else if(!strcmp(inppblk.descr[i].name, "ratelimit.interval")) {
			inst->ratelimitInterval = (int) pvals[i].val.d.n;
		} else {
			dbgprintf("imudp: program error, non-handled "
			  "param '%s'\n", inppblk.descr[i].name);
		}
	}
finalize_it:
	RETiRet;
}


BEGINnewInpInst
	struct cnfparamvals *pvals;
	int i;
	int portIdx;
CODESTARTnewInpInst
	DBGPRINTF("newInpInst (imudp)\n");

	if((pvals = nvlstGetParams(lst, &inppblk, NULL)) == NULL) {
		ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
	}
	if(Debug) {
		dbgprintf("input param blk in imudp:\n");
		cnfparamsPrint(&inppblk, pvals);
	}

	portIdx = cnfparamGetIdx(&inppblk, "port");
	assert(portIdx != -1);
	for(i = 0 ; i <  pvals[portIdx].val.d.ar->nmemb ; ++i) {
		createListner(pvals[portIdx].val.d.ar->arr[i], pvals);
	}

finalize_it:
CODE_STD_FINALIZERnewInpInst
	cnfparamvalsDestruct(pvals, &inppblk);
ENDnewInpInst


BEGINbeginCnfLoad
CODESTARTbeginCnfLoad
	loadModConf = pModConf;
	pModConf->pConf = pConf;
	/* init our settings */
	loadModConf->configSetViaV2Method = 0;
	loadModConf->iTimeRequery = TIME_REQUERY_DFLT;
	loadModConf->iSchedPrio = SCHED_PRIO_UNSET;
	loadModConf->pszSchedPolicy = NULL;
	bLegacyCnfModGlobalsPermitted = 1;
	/* init legacy config vars */
	cs.pszBindRuleset = NULL;
	cs.pszSchedPolicy = NULL;
	cs.pszBindAddr = NULL;
	cs.iSchedPrio = SCHED_PRIO_UNSET;
	cs.iTimeRequery = TIME_REQUERY_DFLT;
ENDbeginCnfLoad


BEGINsetModCnf
	struct cnfparamvals *pvals = NULL;
	int i;
CODESTARTsetModCnf
	pvals = nvlstGetParams(lst, &modpblk, NULL);
	if(pvals == NULL) {
		errmsg.LogError(0, RS_RET_MISSING_CNFPARAMS, "imudp: error processing module "
				"config parameters [module(...)]");
		ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
	}

	if(Debug) {
		dbgprintf("module (global) param blk for imudp:\n");
		cnfparamsPrint(&modpblk, pvals);
	}

	for(i = 0 ; i < modpblk.nParams ; ++i) {
		if(!pvals[i].bUsed)
			continue;
		if(!strcmp(modpblk.descr[i].name, "timerequery")) {
			loadModConf->iTimeRequery = (int) pvals[i].val.d.n;
		} else if(!strcmp(modpblk.descr[i].name, "schedulingpriority")) {
			loadModConf->iSchedPrio = (int) pvals[i].val.d.n;
		} else if(!strcmp(modpblk.descr[i].name, "schedulingpolicy")) {
			loadModConf->pszSchedPolicy = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
		} else {
			dbgprintf("imudp: program error, non-handled "
			  "param '%s' in beginCnfLoad\n", modpblk.descr[i].name);
		}
	}

	/* remove all of our legacy handlers, as they can not used in addition
	 * the the new-style config method.
	 */
	bLegacyCnfModGlobalsPermitted = 0;
	loadModConf->configSetViaV2Method = 1;

finalize_it:
	if(pvals != NULL)
		cnfparamvalsDestruct(pvals, &modpblk);
ENDsetModCnf

BEGINendCnfLoad
CODESTARTendCnfLoad
	if(!loadModConf->configSetViaV2Method) {
		/* persist module-specific settings from legacy config system */
		loadModConf->iSchedPrio = cs.iSchedPrio;
		loadModConf->iTimeRequery = cs.iTimeRequery;
		if((cs.pszSchedPolicy != NULL) && (cs.pszSchedPolicy[0] != '\0')) {
			CHKmalloc(loadModConf->pszSchedPolicy = ustrdup(cs.pszSchedPolicy));
		}
	}

finalize_it:
	loadModConf = NULL; /* done loading */
	/* free legacy config vars */
	free(cs.pszBindRuleset);
	free(cs.pszSchedPolicy);
	free(cs.pszBindAddr);
ENDendCnfLoad


BEGINcheckCnf
	instanceConf_t *inst;
CODESTARTcheckCnf
	checkSchedParam(pModConf); /* this can not cause fatal errors */
	for(inst = pModConf->root ; inst != NULL ; inst = inst->next) {
		std_checkRuleset(pModConf, inst);
	}
	if(pModConf->root == NULL) {
		errmsg.LogError(0, RS_RET_NO_LISTNERS , "imudp: module loaded, but "
				"no listeners defined - no input will be gathered");
		iRet = RS_RET_NO_LISTNERS;
	}
ENDcheckCnf


BEGINactivateCnfPrePrivDrop
	instanceConf_t *inst;
CODESTARTactivateCnfPrePrivDrop
	runModConf = pModConf;
	for(inst = runModConf->root ; inst != NULL ; inst = inst->next) {
		addListner(inst);
	}
	/* if we could not set up any listeners, there is no point in running... */
	if(lcnfRoot == NULL) {
		errmsg.LogError(0, NO_ERRCODE, "imudp: no listeners could be started, "
				"input not activated.\n");
		ABORT_FINALIZE(RS_RET_NO_RUN);
	}

finalize_it:
ENDactivateCnfPrePrivDrop


BEGINactivateCnf
CODESTARTactivateCnf
	/* caching various settings */
	iMaxLine = glbl.GetMaxLine();
	CHKmalloc(pRcvBuf = MALLOC((iMaxLine + 1) * sizeof(char)));
finalize_it:
ENDactivateCnf


BEGINfreeCnf
	instanceConf_t *inst, *del;
CODESTARTfreeCnf
	for(inst = pModConf->root ; inst != NULL ; ) {
		free(inst->pszBindPort);
		free(inst->pszBindAddr);
		free(inst->inputname);
		del = inst;
		inst = inst->next;
		free(del);
	}
ENDfreeCnf

/* This function is called to gather input.
 * Note that sock must be non-NULL because otherwise we would not have
 * indicated that we want to run (or we have a programming error ;)). -- rgerhards, 2008-10-02
 */
BEGINrunInput
CODESTARTrunInput
	/* Note well: the setting of scheduling parameters will not work
	 * when we dropped privileges (if the user is not sufficently
	 * privileged, of course). Howerver, we can't change the 
	 * scheduling params in PrePrivDrop(), as at that point our thread
	 * is not yet created. So at least as an interim solution, we do
	 * NOT support both setting sched parameters and dropping
	 * privileges within the same instance.
	 */
	setSchedParams(runModConf);
	iRet = rcvMainLoop(pThrd);
ENDrunInput


/* initialize and return if will run or not */
BEGINwillRun
CODESTARTwillRun
	net.PrintAllowedSenders(1); /* UDP */
	net.HasRestrictions(UCHAR_CONSTANT("UDP"), &bDoACLCheck); /* UDP */
ENDwillRun


BEGINafterRun
	struct lstn_s *lstn, *lstnDel;
CODESTARTafterRun
	/* do cleanup here */
	net.clearAllowedSenders((uchar*)"UDP");
	for(lstn = lcnfRoot ; lstn != NULL ; ) {
		statsobj.Destruct(&(lstn->stats));
		ratelimitDestruct(lstn->ratelimiter);
		close(lstn->sock);
		prop.Destruct(&lstn->pInputName);
		lstnDel = lstn;
		lstn = lstn->next;
		free(lstnDel);
	}
	lcnfRoot = lcnfLast = NULL;
	if(pRcvBuf != NULL) {
		free(pRcvBuf);
		pRcvBuf = NULL;
	}
ENDafterRun


BEGINmodExit
CODESTARTmodExit
	/* release what we no longer need */
	objRelease(errmsg, CORE_COMPONENT);
	objRelease(glbl, CORE_COMPONENT);
	objRelease(statsobj, CORE_COMPONENT);
	objRelease(datetime, CORE_COMPONENT);
	objRelease(prop, CORE_COMPONENT);
	objRelease(ruleset, CORE_COMPONENT);
	objRelease(net, LM_NET_FILENAME);
ENDmodExit


BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
	if(eFeat == sFEATURENonCancelInputTermination)
		iRet = RS_RET_OK;
ENDisCompatibleWithFeature


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_IMOD_QUERIES
CODEqueryEtryPt_STD_CONF2_QUERIES
CODEqueryEtryPt_STD_CONF2_setModCnf_QUERIES
CODEqueryEtryPt_STD_CONF2_PREPRIVDROP_QUERIES
CODEqueryEtryPt_STD_CONF2_IMOD_QUERIES
CODEqueryEtryPt_IsCompatibleWithFeature_IF_OMOD_QUERIES
ENDqueryEtryPt

static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
	free(cs.pszBindAddr);
	cs.pszBindAddr = NULL;
	free(cs.pszSchedPolicy);
	cs.pszSchedPolicy = NULL;
	free(cs.pszBindRuleset);
	cs.pszBindRuleset = NULL;
	cs.iSchedPrio = SCHED_PRIO_UNSET;
	cs.iTimeRequery = TIME_REQUERY_DFLT;/* the default is to query only every second time */
	return RS_RET_OK;
}


BEGINmodInit()
CODESTARTmodInit
	*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
	CHKiRet(objUse(glbl, CORE_COMPONENT));
	CHKiRet(objUse(statsobj, CORE_COMPONENT));
	CHKiRet(objUse(datetime, CORE_COMPONENT));
	CHKiRet(objUse(prop, CORE_COMPONENT));
	CHKiRet(objUse(ruleset, CORE_COMPONENT));
	CHKiRet(objUse(net, LM_NET_FILENAME));

	/* register config file handlers */
	CHKiRet(omsdRegCFSLineHdlr((uchar *)"inputudpserverbindruleset", 0, eCmdHdlrGetWord,
		NULL, &cs.pszBindRuleset, STD_LOADABLE_MODULE_ID));
	CHKiRet(omsdRegCFSLineHdlr((uchar *)"udpserverrun", 0, eCmdHdlrGetWord,
		addInstance, NULL, STD_LOADABLE_MODULE_ID));
	CHKiRet(omsdRegCFSLineHdlr((uchar *)"udpserveraddress", 0, eCmdHdlrGetWord,
		NULL, &cs.pszBindAddr, STD_LOADABLE_MODULE_ID));
	/* module-global config params - will be disabled in configs that are loaded
	 * via module(...).
	 */
	CHKiRet(regCfSysLineHdlr2((uchar *)"imudpschedulingpolicy", 0, eCmdHdlrGetWord,
		NULL, &cs.pszSchedPolicy, STD_LOADABLE_MODULE_ID, &bLegacyCnfModGlobalsPermitted));
	CHKiRet(regCfSysLineHdlr2((uchar *)"imudpschedulingpriority", 0, eCmdHdlrInt,
		NULL, &cs.iSchedPrio, STD_LOADABLE_MODULE_ID, &bLegacyCnfModGlobalsPermitted));
	CHKiRet(regCfSysLineHdlr2((uchar *)"udpservertimerequery", 0, eCmdHdlrInt,
		NULL, &cs.iTimeRequery, STD_LOADABLE_MODULE_ID, &bLegacyCnfModGlobalsPermitted));

	CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler,
		resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/* vim:set ai:
 */