summaryrefslogtreecommitdiffstats
path: root/omfwd.c
blob: 84436381b6bd721e12c71f64a3d3f34efe4790ce (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
/* omfwd.c
 * This is the implementation of the build-in forwarding output module.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2007-07-20 by RGerhards (extracted from syslogd.c)
 * This file is under development and has not yet arrived at being fully
 * self-contained and a real object. So far, it is mostly an excerpt
 * of the "old" message code without any modifications. However, it
 * helps to have things at the right place one we go to the meat of it.
 *
 * Copyright 2007 Rainer Gerhards and Adiscon GmbH.
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */
#include "config.h"
#ifdef SYSLOG_INET
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fnmatch.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#ifdef USE_PTHREADS
#include <pthread.h>
#endif
#include "rsyslog.h"
#include "syslogd.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "net.h"
#include "omfwd.h"
#include "template.h"
#include "msg.h"
#include "tcpsyslog.h"
#include "module-template.h"

/*
 * This table contains plain text for h_errno errors used by the
 * net subsystem.
 */
static const char *sys_h_errlist[] = {
    "No problem",						/* NETDB_SUCCESS */
    "Authoritative answer: host not found",			/* HOST_NOT_FOUND */
    "Non-authoritative answer: host not found, or serverfail",	/* TRY_AGAIN */
    "Non recoverable errors",					/* NO_RECOVERY */
    "Valid name, no data record of requested type",		/* NO_DATA */
    "no address, look for MX record"				/* NO_ADDRESS */
 };

/* internal structures
 */
typedef struct _instanceData {
	char	f_hname[MAXHOSTNAMELEN+1];
	short	sock;			/* file descriptor */
	enum { /* TODO: we shoud revisit these definitions */
		eDestFORW,
		eDestFORW_SUSP,
		eDestFORW_UNKN
	} eDestState;
	int iRtryCnt;
	struct addrinfo *f_addr;
	int compressionLevel; /* 0 - no compression, else level for zlib */
	char *port;
	int protocol;
	TCPFRAMINGMODE tcp_framing;
#	define	FORW_UDP 0
#	define	FORW_TCP 1
	/* following fields for TCP-based delivery */
	enum TCPSendStatus {
		TCP_SEND_NOTCONNECTED = 0,
		TCP_SEND_CONNECTING = 1,
		TCP_SEND_READY = 2
	} status;
	char *savedMsg;
	int savedMsgLen; /* length of savedMsg in octets */
	time_t	ttSuspend;	/* time selector was suspended */
#	ifdef USE_PTHREADS
	pthread_mutex_t mtxTCPSend;
#	endif
} instanceData;


BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance


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


BEGINfreeInstance
CODESTARTfreeInstance
	switch (pData->eDestState) {
		case eDestFORW:
		case eDestFORW_SUSP:
			freeaddrinfo(pData->f_addr);
			/* fall through */
		case eDestFORW_UNKN:
			if(pData->port != NULL)
				free(pData->port);
			break;
	}
#	ifdef USE_PTHREADS
	/* delete any mutex objects, if present */
	if(pData->protocol == FORW_TCP) {
		pthread_mutex_destroy(&pData->mtxTCPSend);
	}
#	endif
ENDfreeInstance


BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
	printf("%s", pData->f_hname);
ENDdbgPrintInstInfo

/* CODE FOR SENDING TCP MESSAGES */

/* get send status
 * rgerhards, 2005-10-24
 */
static void TCPSendSetStatus(instanceData *pData, enum TCPSendStatus iNewState)
{
	assert(pData != NULL);
	assert(pData->protocol == FORW_TCP);
	assert(   (iNewState == TCP_SEND_NOTCONNECTED)
	       || (iNewState == TCP_SEND_CONNECTING)
	       || (iNewState == TCP_SEND_READY));

	/* there can potentially be a race condition, so guard by mutex */
#	ifdef	USE_PTHREADS
		pthread_mutex_lock(&pData->mtxTCPSend);
#	endif
	pData->status = iNewState;
#	ifdef	USE_PTHREADS
		pthread_mutex_unlock(&pData->mtxTCPSend);
#	endif
}


/* set send status
 * rgerhards, 2005-10-24
 */
static enum TCPSendStatus TCPSendGetStatus(instanceData *pData)
{
	enum TCPSendStatus eState;
	assert(pData != NULL);
	assert(pData->protocol == FORW_TCP);

	/* there can potentially be a race condition, so guard by mutex */
#	ifdef	USE_PTHREADS
		pthread_mutex_lock(&pData->mtxTCPSend);
#	endif
	eState = pData->status;
#	ifdef	USE_PTHREADS
		pthread_mutex_unlock(&pData->mtxTCPSend);
#	endif

	return eState;
}


/* Initialize TCP sockets (for sender)
 * This is done once per selector line, if not yet initialized.
 */
static int TCPSendCreateSocket(instanceData *pData, struct addrinfo *addrDest)
{
	int fd;
	struct addrinfo *r; 
	
	assert(pData != NULL);
	
	r = addrDest;

	while(r != NULL) {
		fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
		if (fd != -1) {
			/* We can not allow the TCP sender to block syslogd, at least
			 * not in a single-threaded design. That would cause rsyslogd to
			 * loose input messages - which obviously also would affect
			 * other selector lines, too. So we do set it to non-blocking and 
			 * handle the situation ourselfs (by discarding messages). IF we run
			 * dual-threaded, however, the situation is different: in this case,
			 * the receivers and the selector line processing are only loosely
			 * coupled via a memory buffer. Now, I think, we can afford the extra
			 * wait time. Thus, we enable blocking mode for TCP if we compile with
			 * pthreads.
			 * rgerhards, 2005-10-25
			 */
#	ifndef USE_PTHREADS
			/* set to nonblocking - rgerhards 2005-07-20 */
			fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
#	endif		
			if (connect (fd, r->ai_addr, r->ai_addrlen) != 0) {
				if(errno == EINPROGRESS) {
					/* this is normal - will complete during select */
					TCPSendSetStatus(pData, TCP_SEND_CONNECTING);
					return fd;
				} else {
					dprintf("create tcp connection failed, reason %s",
						strerror(errno));
				}

			}
			else {
				TCPSendSetStatus(pData, TCP_SEND_READY);
				return fd;
			}
			close(fd);
		}
		else {
			dprintf("couldn't create send socket, reason %s", strerror(errno));
		}		
		r = r->ai_next;
	}

	dprintf("no working socket could be obtained");

	return -1;
}

/* Sends a TCP message. It is first checked if the
 * session is open and, if not, it is opened. Then the send
 * is tried. If it fails, one silent re-try is made. If the send
 * fails again, an error status (-1) is returned. If all goes well,
 * 0 is returned. The TCP session is NOT torn down.
 * For now, EAGAIN is ignored (causing message loss) - but it is
 * hard to do something intelligent in this case. With this
 * implementation here, we can not block and/or defer. Things are
 * probably a bit better when we move to liblogging. The alternative
 * would be to enhance the current select server with buffering and
 * write descriptors. This seems not justified, given the expected
 * short life span of this code (and the unlikeliness of this event).
 * rgerhards 2005-07-06
 * This function is now expected to stay. Libloging won't be used for
 * that purpose. I have added the param "len", because it is known by the
 * caller and so safes us some time. Also, it MUST be given because there
 * may be NULs inside msg so that we can not rely on strlen(). Please note
 * that the restrictions outlined above do not existin in multi-threaded
 * mode, which we assume will now be most often used. So there is no
 * real issue with the potential message loss in single-threaded builds.
 * rgerhards, 2006-11-30
 * 
 * In order to support compressed messages via TCP, we must support an
 * octet-counting based framing (LF may be part of the compressed message).
 * We are now supporting the same mode that is available in IETF I-D
 * syslog-transport-tls-05 (current at the time of this writing). This also
 * eases things when we go ahead and implement that framing. I have now made
 * available two cases where this framing is used: either by explitely
 * specifying it in the config file or implicitely when sending a compressed
 * message. In the later case, compressed and uncompressed messages within
 * the same session have different framings. If it is explicitely set to
 * octet-counting, only this framing mode is used within the session.
 * rgerhards, 2006-12-07
 */
static int TCPSend(selector_t *f, instanceData *pData, char *msg, size_t len)
{
	int retry = 0;
	int done = 0;
	int bIsCompressed;
	int lenSend;
	char *buf = NULL;	/* if this is non-NULL, it MUST be freed before return! */
	enum TCPSendStatus eState;
	TCPFRAMINGMODE framingToUse;

	assert(pData != NULL);
	assert(f != NULL);
	assert(msg != NULL);
	assert(len > 0);

	bIsCompressed = *msg == 'z';	/* cache this, so that we can modify the message buffer */
	/* select framing for this record. If we have a compressed record, we always need to
	 * use octet counting because the data potentially contains all control characters
	 * including LF.
	 */
	framingToUse = bIsCompressed ? TCP_FRAMING_OCTET_COUNTING : pData->tcp_framing;

	do { /* try to send message */
		if(pData->sock <= 0) {
			/* we need to open the socket first */
			if((pData->sock = TCPSendCreateSocket(pData, pData->f_addr)) <= 0) {
				return -1;
			}
		}

		eState = TCPSendGetStatus(pData); /* cache info */

		if(eState == TCP_SEND_CONNECTING) {
			/* In this case, we save the buffer. If we have a
			 * system with few messages, that hopefully prevents
			 * message loss at all. However, we make no further attempts,
			 * just the first message is saved. So we only try this
			 * if there is not yet a saved message present.
			 * rgerhards 2005-07-20
			 */
			if(pData->savedMsg == NULL) {
				pData->savedMsg = malloc(len * sizeof(char));
				if(pData->savedMsg == NULL)
					return 0; /* nothing we can do... */
				memcpy(pData->savedMsg, msg, len);
				pData->savedMsgLen = len;
			}
			return 0;
		} else if(eState != TCP_SEND_READY)
			/* This here is debatable. For the time being, we
			 * accept the loss of a single message (e.g. during
			 * connection setup in favour of not messing with
			 * wait time and timeouts. The reason is that such
			 * things might otherwise cost us considerable message
			 * loss on the receiving side (even at a timeout set
			 * to just 1 second).  - rgerhards 2005-07-20
			 */
			return 0;

		/* now check if we need to add a line terminator. We need to
		 * copy the string in memory in this case, this is probably
		 * quicker than using writev and definitely quicker than doing
		 * two socket calls.
		 * rgerhards 2005-07-22
		 *//*
		 * Some messages already contain a \n character at the end
		 * of the message. We append one only if we there is not
		 * already one. This seems the best fit, though this also
		 * means the message does not arrive unaltered at the final
		 * destination. But in the spirit of legacy syslog, this is
		 * probably the best to do...
		 * rgerhards 2005-07-20
		 */

		/* Build frame based on selected framing */
		if(framingToUse == TCP_FRAMING_OCTET_STUFFING) {
			if((*(msg+len-1) != '\n')) {
				if(buf != NULL)
					free(buf);
				/* in the malloc below, we need to add 2 to the length. The
				 * reason is that we a) add one character and b) len does
				 * not take care of the '\0' byte. Up until today, it was just
				 * +1 , which caused rsyslogd to sometimes dump core.
				 * I have added this comment so that the logic is not accidently
				 * changed again. rgerhards, 2005-10-25
				 */
				if((buf = malloc((len + 2) * sizeof(char))) == NULL) {
					/* extreme mem shortage, try to solve
					 * as good as we can. No point in calling
					 * any alarms, they might as well run out
					 * of memory (the risk is very high, so we
					 * do NOT risk that). If we have a message of
					 * more than 1 byte (what I guess), we simply
					 * overwrite the last character.
					 * rgerhards 2005-07-22
					 */
					if(len > 1) {
						*(msg+len-1) = '\n';
					} else {
						/* we simply can not do anything in
						 * this case (its an error anyhow...).
						 */
					}
				} else {
					/* we got memory, so we can copy the message */
					memcpy(buf, msg, len); /* do not copy '\0' */
					*(buf+len) = '\n';
					*(buf+len+1) = '\0';
					msg = buf; /* use new one */
					++len; /* care for the \n */
				}
			}
		} else {
			/* Octect-Counting
			 * In this case, we need to always allocate a buffer. This is because
			 * we need to put a header in front of the message text
			 */
			char szLenBuf[16];
			int iLenBuf;

			/* important: the printf-mask is "%d<sp>" because there must be a
			 * space after the len!
			 *//* The chairs of the IETF syslog-sec WG have announced that it is
			 * consensus to do the octet count on the SYSLOG-MSG part only. I am
			 * now changing the code to reflect this. Hopefully, it will not change
			 * once again (there can no compatibility layer programmed for this).
			 * To be on the save side, I just comment the code out. I mark these
			 * comments with "IETF20061218".
			 * rgerhards, 2006-12-19
			 */
			iLenBuf = snprintf(szLenBuf, sizeof(szLenBuf)/sizeof(char), "%d ", (int) len);
			/* IETF20061218 iLenBuf =
			  snprintf(szLenBuf, sizeof(szLenBuf)/sizeof(char), "%d ", len + iLenBuf);*/

			if((buf = malloc((len + iLenBuf) * sizeof(char))) == NULL) {
			 	/* we are out of memory. This is an extreme situation. We do not
				 * call any alarm handlers because they most likely run out of mem,
				 * too. We are brave enough to call debug output, though. Other than
				 * that, there is nothing left to do. We can not sent the message (as
				 * in case of the other framing, because the message is incomplete.
				 * We could, however, send two chunks (header and text separate), but
				 * that would cause a lot of complexity in the code. So we think it
				 * is appropriate enough to just make sure we do not crash in this
				 * very unlikely case. For this, it is justified just to loose
				 * the message. Rgerhards, 2006-12-07
				 */
				 dprintf("Error: out of memory when building TCP octet-counted "
				         "frame. Message is lost, trying to continue.\n");
				return 0;
			}

			 memcpy(buf, szLenBuf, iLenBuf); /* header */
			 memcpy(buf + iLenBuf, msg, len); /* message */
			 len += iLenBuf;	/* new message size */
			 msg = buf;	/* set message buffer */
		}

		/* frame building complete, on to actual sending */

		lenSend = send(pData->sock, msg, len, 0);
		dprintf("TCP sent %d bytes, requested %d, msg: '%s'\n", lenSend, len,
			bIsCompressed ? "***compressed***" : msg);
		if((unsigned)lenSend == len) {
			/* all well */
			if(buf != NULL) {
				free(buf);
			}
			return 0;
		} else if(lenSend != -1) {
			/* no real error, could "just" not send everything... 
			 * For the time being, we ignore this...
			 * rgerhards, 2005-10-25
			 */
			dprintf("message not completely (tcp)send, ignoring %d\n", lenSend);
#			if USE_PTHREADS
			usleep(1000); /* experimental - might be benefitial in this situation */
#			endif
			if(buf != NULL)
				free(buf);
			return 0;
		}

		switch(errno) {
		case EMSGSIZE:
			dprintf("message not (tcp)send, too large\n");
			/* This is not a real error, so it is not flagged as one */
			if(buf != NULL)
				free(buf);
			return 0;
			break;
		case EINPROGRESS:
		case EAGAIN:
			dprintf("message not (tcp)send, would block\n");
#			if USE_PTHREADS
			usleep(1000); /* experimental - might be benefitial in this situation */
#			endif
			/* we loose this message, but that's better than loosing
			 * all ;)
			 */
			/* This is not a real error, so it is not flagged as one */
			if(buf != NULL)
				free(buf);
			return 0;
			break;
		default:
			dprintf("message not (tcp)send");
			break;
		}
	
		if(retry == 0) {
			++retry;
			/* try to recover */
			close(pData->sock);
			TCPSendSetStatus(pData, TCP_SEND_NOTCONNECTED);
			pData->sock = -1;
		} else {
			if(buf != NULL)
				free(buf);
			return -1;
		}
	} while(!done); /* warning: do ... while() */
	/*NOT REACHED*/

	if(buf != NULL)
		free(buf);
	return -1; /* only to avoid compiler warning! */
}


/* get the syslog forward port from selector_t. The passed in
 * struct must be one that is setup for forwarding.
 * rgerhards, 2007-06-28
 * We may change the implementation to try to lookup the port
 * if it is unspecified. So far, we use the IANA default auf 514.
 */
static char *getFwdSyslogPt(instanceData *pData)
{
	assert(pData != NULL);
	if(pData->port == NULL)
		return("514");
	else
		return(pData->port);
}


BEGINdoAction
	char *psz; /* temporary buffering */
	register unsigned l;
	int i;
	unsigned e, lsent = 0;
	int bSendSuccess;
	time_t fwd_suspend;
	struct addrinfo *res, *r;
	struct addrinfo hints;
CODESTARTdoAction
	switch (pData->eDestState) {
	case eDestFORW_SUSP:
		fwd_suspend = time(NULL) - pData->ttSuspend;
		if ( fwd_suspend >= INET_SUSPEND_TIME ) {
			dprintf("\nForwarding suspension over, retrying FORW ");
			pData->eDestState = eDestFORW;
			goto f_forw;
		}
		else {
			dprintf(" %s\n", pData->f_hname);
			dprintf("Forwarding suspension not over, time left: %d.\n",
			        INET_SUSPEND_TIME - fwd_suspend);
		}
		break;
		
	/* The trick is to wait some time, then retry to get the
	 * address. If that fails retry x times and then give up.
	 *
	 * You'll run into this problem mostly if the name server you
	 * need for resolving the address is on the same machine, but
	 * is started after syslogd. 
	 */
	case eDestFORW_UNKN:
	/* The remote address is not yet known and needs to be obtained */
		dprintf(" %s\n", pData->f_hname);
		fwd_suspend = time(NULL) - pData->ttSuspend;
		if(fwd_suspend >= INET_SUSPEND_TIME) {
			dprintf("Forwarding suspension to unknown over, retrying\n");
			memset(&hints, 0, sizeof(hints));
			/* port must be numeric, because config file syntax requests this */
			/* TODO: this code is a duplicate from cfline() - we should later create
			 * a common function.
			 */
			hints.ai_flags = AI_NUMERICSERV;
			hints.ai_family = family;
			hints.ai_socktype = pData->protocol == FORW_UDP ? SOCK_DGRAM : SOCK_STREAM;
			if((e = getaddrinfo(pData->f_hname,
					    getFwdSyslogPt(pData), &hints, &res)) != 0) {
				dprintf("Failure: %s\n", sys_h_errlist[h_errno]);
				dprintf("Retries: %d\n", pData->iRtryCnt);
				if ( --pData->iRtryCnt < 0 ) {
					dprintf("Giving up.\n");
					iRet = RS_RET_DISABLE_ACTION;
				}
				else
					dprintf("Left retries: %d\n", pData->iRtryCnt);
			}
			else {
			        dprintf("%s found, resuming.\n", pData->f_hname);
				pData->f_addr = res;
				pData->iRtryCnt = 0;
				pData->eDestState = eDestFORW;
				goto f_forw;
			}
		}
		else
			dprintf("Forwarding suspension not over, time " \
				"left: %d\n", INET_SUSPEND_TIME - fwd_suspend);
		break;

	case eDestFORW:
	f_forw:
		dprintf(" %s:%s/%s\n", pData->f_hname, getFwdSyslogPt(pData),
			 pData->protocol == FORW_UDP ? "udp" : "tcp");
		if ( strcmp(getHOSTNAME(f->f_pMsg), LocalHostName) && NoHops )
			dprintf("Not sending message to remote.\n");
		else {
			pData->ttSuspend = time(NULL);
			psz = (char*) pMsg;
			l = strlen((char*) psz);
			if (l > MAXLINE)
				l = MAXLINE;

#			ifdef	USE_NETZIP
			/* Check if we should compress and, if so, do it. We also
			 * check if the message is large enough to justify compression.
			 * The smaller the message, the less likely is a gain in compression.
			 * To save CPU cycles, we do not try to compress very small messages.
			 * What "very small" means needs to be configured. Currently, it is
			 * hard-coded but this may be changed to a config parameter.
			 * rgerhards, 2006-11-30
			 */
			if(pData->compressionLevel && (l > MIN_SIZE_FOR_COMPRESS)) {
				Bytef out[MAXLINE+MAXLINE/100+12] = "z";
				uLongf destLen = sizeof(out) / sizeof(Bytef);
				uLong srcLen = l;
				int ret;
				ret = compress2((Bytef*) out+1, &destLen, (Bytef*) psz,
						srcLen, pData->compressionLevel);
				dprintf("Compressing message, length was %d now %d, return state  %d.\n",
					l, (int) destLen, ret);
				if(ret != Z_OK) {
					/* if we fail, we complain, but only in debug mode
					 * Otherwise, we are silent. In any case, we ignore the
					 * failed compression and just sent the uncompressed
					 * data, which is still valid. So this is probably the
					 * best course of action.
					 * rgerhards, 2006-11-30
					 */
					dprintf("Compression failed, sending uncompressed message\n");
				} else if(destLen+1 < l) {
					/* only use compression if there is a gain in using it! */
					dprintf("there is gain in compression, so we do it\n");
					psz = (char*) out;
					l = destLen + 1; /* take care for the "z" at message start! */
				}
				++destLen;
			}
#			endif

			if(pData->protocol == FORW_UDP) {
				/* forward via UDP */
	                        if(finet != NULL) {
					/* we need to track if we have success sending to the remote
					 * peer. Success is indicated by at least one sendto() call
					 * succeeding. We track this be bSendSuccess. We can not simply
					 * rely on lsent, as a call might initially work, but a later
					 * call fails. Then, lsent has the error status, even though
					 * the sendto() succeeded.
					 * rgerhards, 2007-06-22
					 */
					bSendSuccess = FALSE;
					for (r = pData->f_addr; r; r = r->ai_next) {
		                       		for (i = 0; i < *finet; i++) {
		                                       lsent = sendto(finet[i+1], psz, l, 0,
		                                                      r->ai_addr, r->ai_addrlen);
							if (lsent == l) {
						       		bSendSuccess = TRUE;
								break;
							} else {
								int eno = errno;
								dprintf("sendto() error: %d = %s.\n",
									eno, strerror(eno));
							}
		                                }
						if (lsent == l && !send_to_all)
	                         	               break;
					}
					/* finished looping */
	                                if (bSendSuccess == FALSE) {
		                                pData->eDestState = eDestFORW_SUSP;
		                                errno = 0;
		                                logerror("error forwarding via udp, suspending");
					}
				}
			} else {
				/* forward via TCP */
				if(TCPSend(f, pData, psz, l) != 0) {
					/* error! */
					pData->eDestState = eDestFORW_SUSP;
					errno = 0;
					logerror("error forwarding via tcp, suspending...");
				}
			}
		}
		break;
	}

	if(pData->eDestState != eDestFORW) {
		/* TODO: think somewhat more about this code at the end of modularization. I think
		 * it is clean right now, but we could build a better interface for suspension. I
		 * think we will naturally re-visit this when we implement global suspension and
		 * queueing - I anticipate that the whole FORW_SUSP/FORW_UNKN goes away by then.
		 * rgerhards, 2007-07-26
		 */
		iRet = RS_RET_SUSPENDED;
	}
ENDdoAction


BEGINparseSelectorAct
	uchar *q;
	int i;
        int error;
	int bErr;
        struct addrinfo hints, *res;
	char szTemplateName[128];
CODESTARTparseSelectorAct
	p = *pp;

	if(*p == '@') {
		if((iRet = createInstance(&pData)) != RS_RET_OK)
			return iRet;
		++p; /* eat '@' */
		if(*p == '@') { /* indicator for TCP! */
			pData->protocol = FORW_TCP;
			++p; /* eat this '@', too */
			/* in this case, we also need a mutex... */
#			ifdef USE_PTHREADS
			pthread_mutex_init(&pData->mtxTCPSend, 0);
#			endif
		} else {
			pData->protocol = FORW_UDP;
		}
		/* we are now after the protocol indicator. Now check if we should
		 * use compression. We begin to use a new option format for this:
		 * @(option,option)host:port
		 * The first option defined is "z[0..9]" where the digit indicates
		 * the compression level. If it is not given, 9 (best compression) is
		 * assumed. An example action statement might be:
		 * @@(z5,o)127.0.0.1:1400  
		 * Which means send via TCP with medium (5) compresion (z) to the local
		 * host on port 1400. The '0' option means that octet-couting (as in
		 * IETF I-D syslog-transport-tls) is to be used for framing (this option
		 * applies to TCP-based syslog only and is ignored when specified with UDP).
		 * That is not yet implemented.
		 * rgerhards, 2006-12-07
		 */
		if(*p == '(') {
			/* at this position, it *must* be an option indicator */
			do {
				++p; /* eat '(' or ',' (depending on when called) */
				/* check options */
				if(*p == 'z') { /* compression */
#					ifdef USE_NETZIP
					++p; /* eat */
					if(isdigit((int) *p)) {
						int iLevel;
						iLevel = *p - '0';
						++p; /* eat */
						pData->compressionLevel = iLevel;
					} else {
						logerrorInt("Invalid compression level '%c' specified in "
						         "forwardig action - NOT turning on compression.",
							 *p);
					}
#					else
					logerror("Compression requested, but rsyslogd is not compiled "
					         "with compression support - request ignored.");
#					endif /* #ifdef USE_NETZIP */
				} else if(*p == 'o') { /* octet-couting based TCP framing? */
					++p; /* eat */
					/* no further options settable */
					pData->tcp_framing = TCP_FRAMING_OCTET_COUNTING;
				} else { /* invalid option! Just skip it... */
					logerrorInt("Invalid option %c in forwarding action - ignoring.", *p);
					++p; /* eat invalid option */
				}
				/* the option processing is done. We now do a generic skip
				 * to either the next option or the end of the option
				 * block.
				 */
				while(*p && *p != ')' && *p != ',')
					++p;	/* just skip it */
			} while(*p && *p == ','); /* Attention: do.. while() */
			if(*p == ')')
				++p; /* eat terminator, on to next */
			else
				/* we probably have end of string - leave it for the rest
				 * of the code to handle it (but warn the user)
				 */
				logerror("Option block not terminated in forwarding action.");
		}
		/* extract the host first (we do a trick - we replace the ';' or ':' with a '\0')
		 * now skip to port and then template name. rgerhards 2005-07-06
		 */
		for(q = p ; *p && *p != ';' && *p != ':' ; ++p)
		 	/* JUST SKIP */;

		pData->port = NULL;
		if(*p == ':') { /* process port */
			uchar * tmp;

			*p = '\0'; /* trick to obtain hostname (later)! */
			tmp = ++p;
			for(i=0 ; *p && isdigit((int) *p) ; ++p, ++i)
				/* SKIP AND COUNT */;
			pData->port = malloc(i + 1);
			if(pData->port == NULL) {
				logerror("Could not get memory to store syslog forwarding port, "
					 "using default port, results may not be what you intend\n");
				/* we leave f_forw.port set to NULL, this is then handled by
				 * getFwdSyslogPt().
				 */
			} else {
				memcpy(pData->port, tmp, i);
				*(pData->port + i) = '\0';
			}
		}
		
		/* now skip to template */
		bErr = 0;
		while(*p && *p != ';') {
			if(*p && *p != ';' && !isspace((int) *p)) {
				if(bErr == 0) { /* only 1 error msg! */
					bErr = 1;
					errno = 0;
					logerror("invalid selector line (port), probably not doing "
					         "what was intended");
				}
			}
			++p;
		}
	
		if(*p == ';') {
			*p = '\0'; /* trick to obtain hostname (later)! */
			++p;
			 /* Now look for the template! */
			cflineParseTemplateName(&p, szTemplateName,
						sizeof(szTemplateName) / sizeof(char));
		} else
			szTemplateName[0] = '\0';
		if(szTemplateName[0] == '\0') {
			/* we do not have a template, so let's use the default */
			strcpy(szTemplateName, " StdFwdFmt");
		}

		/* first set the pData->eDestState */
		strcpy(pData->f_hname, (char*) q);
		memset(&hints, 0, sizeof(hints));
		/* port must be numeric, because config file syntax requests this */
		hints.ai_flags = AI_NUMERICSERV;
		hints.ai_family = family;
		hints.ai_socktype = pData->protocol == FORW_UDP ? SOCK_DGRAM : SOCK_STREAM;
		if( (error = getaddrinfo(pData->f_hname, getFwdSyslogPt(pData), &hints, &res)) != 0) {
			pData->eDestState = eDestFORW_UNKN;
			pData->iRtryCnt = INET_RETRY_MAX;
			pData->ttSuspend = time(NULL);
		} else {
			pData->eDestState = eDestFORW;
			pData->f_addr = res;
		}

		/* then try to find the template */
		if((iRet = cflineSetTemplateAndIOV(f, szTemplateName)) == RS_RET_OK) {
			dprintf("forwarding host: '%s:%s/%s' template '%s'\n", q, getFwdSyslogPt(pData),
				 pData->protocol == FORW_UDP ? "udp" : "tcp",
				 szTemplateName);
		}
		/*
		 * Otherwise the host might be unknown due to an
		 * inaccessible nameserver (perhaps on the same
		 * host). We try to get the ip number later, like
		 * FORW_SUSP.
		 */
	} else {
		iRet = RS_RET_CONFLINE_UNPROCESSED;
	}

	/* TODO: do we need to call freeInstance if we failed - this is a general question for
	 * all output modules. I'll address it lates as the interface evolves. rgerhards, 2007-07-25
	 */
ENDparseSelectorAct


BEGINneedUDPSocket
CODESTARTneedUDPSocket
	iRet = RS_RET_TRUE;
ENDneedUDPSocket


BEGINonSelectReadyWrite
CODESTARTonSelectReadyWrite
	dprintf("tcp send socket %d ready for writing.\n", pData->sock);
	TCPSendSetStatus(pData, TCP_SEND_READY);
	/* Send stored message (if any) */
	if(pData->savedMsg != NULL) {
		if(TCPSend(f, pData, pData->savedMsg,
			   pData->savedMsgLen) != 0) {
			/* error! */
			pData->eDestState = eDestFORW_SUSP;
			errno = 0;
			logerror("error forwarding via tcp, suspending...");
		}
		free(pData->savedMsg);
		pData->savedMsg = NULL;
	}
ENDonSelectReadyWrite


BEGINgetWriteFDForSelect
CODESTARTgetWriteFDForSelect
	if(   (pData->eDestState == eDestFORW)
	   && (pData->protocol == FORW_TCP)
	   && TCPSendGetStatus(pData) == TCP_SEND_CONNECTING) {
		*fd = pData->sock;
		iRet = RS_RET_OK;
	}
ENDgetWriteFDForSelect


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
ENDqueryEtryPt


BEGINmodInit(Fwd)
CODESTARTmodInit
	*ipIFVersProvided = 1; /* so far, we only support the initial definition */
ENDmodInit

#endif /* #ifdef SYSLOG_INET */
/*
 * vi:set ai:
 */