summaryrefslogtreecommitdiffstats
path: root/tcpsrv.c
blob: 4030b2062d9c317dc077e27d592f602a31685e6c (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
/* tcpsrv.c
 *
 * Common code for plain TCP based servers. This is currently being
 * utilized by imtcp and imgssapi. I suspect that when we implement
 * SSL/TLS, that module could also use tcpsrv.
 *
 * There are actually two classes within the tcpserver code: one is
 * the tcpsrv itself, the other one is its sessions. This is a helper
 * class to tcpsrv.
 *
 * The common code here calls upon specific functionality by using
 * callbacks. The specialised input modules need to set the proper
 * callbacks before the code is run. The tcpsrv then calls back
 * into the specific input modules at the appropriate time.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2007-12-21 by RGerhards (extracted from syslogd.c)
 *
 * Copyright 2007, 2008 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 <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <ctype.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "rsyslog.h"
#include "syslogd.h"
#include "cfsysline.h"
#include "module-template.h"
#include "net.h"
#include "srUtils.h"
#include "conf.h"
#include "tcpsrv.h"
#include "obj.h"
#include "errmsg.h"

MODULE_TYPE_LIB

/* defines */
#define TCPSESS_MAX_DEFAULT 200 /* default for nbr of tcp sessions if no number is given */

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(conf)
DEFobjCurrIf(tcps_sess)
DEFobjCurrIf(errmsg)
DEFobjCurrIf(net)



/* code to free all sockets within a socket table.
 * A socket table is a descriptor table where the zero
 * element has the count of elements. This is used for
 * listening sockets. The socket table itself is also
 * freed.
 * A POINTER to this structure must be provided, thus
 * double indirection!
 * rgerhards, 2007-06-28
 */
static void freeAllSockets(int **socks)
{
	assert(socks != NULL);
	assert(*socks != NULL);
	while(**socks) {
		dbgprintf("Closing socket %d.\n", (*socks)[**socks]);
		close((*socks)[**socks]);
		(**socks)--;
	}
	free(*socks);
	*socks = NULL;
}


/* configure TCP listener settings. This is called during command
 * line parsing. The argument following -t is supplied as an argument.
 * The format of this argument is
 * "<port-to-use>, <nbr-of-sessions>"
 * Typically, there is no whitespace between port and session number.
 * (but it may be...).
 * NOTE: you can not use dbgprintf() in here - the dbgprintf() system is
 * not yet initilized when this function is called.
 * rgerhards, 2007-06-21
 * We can also not use errmsg.LogError(NO_ERRCODE, ), as that system is also not yet
 * initialized... rgerhards, 2007-06-28
 */
static void
configureTCPListen(tcpsrv_t *pThis, char *cOptarg)
{
	register int i;
	register char *pArg = cOptarg;

	assert(cOptarg != NULL);
	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* extract port */
	i = 0;
	while(isdigit((int) *pArg)) {
		i = i * 10 + *pArg++ - '0';
	}

	if( i >= 0 && i <= 65535) {
		pThis->TCPLstnPort = cOptarg;
	} else {
		errmsg.LogError(NO_ERRCODE, "Invalid TCP listen port %s - changed to 514.\n", cOptarg);
		pThis->TCPLstnPort = "514";
	}
}


#if 0 // I think this is no longer needed
static void
configureTCPListenSessMax(char *cOptarg)
{
	register int i;
	register char *pArg = cOptarg;

	assert(cOptarg != NULL);

	/* number of sessions */
	i = 0;
	while(isdigit((int) *pArg)) {
		i = i * 10 + *pArg++ - '0';
	}

	if(i > 0)
		pThis->iSessMax = i;
	else {
		/* too small, need to adjust */
		errmsg.LogError(NO_ERRCODE, "TCP session max configured to %s - changing to 1.\n", cOptarg);
		pThis->iSessMax = 1;
	}
}
#endif


/* Initialize the session table
 * returns 0 if OK, somewhat else otherwise
 */
static rsRetVal
TCPSessTblInit(tcpsrv_t *pThis)
{
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions == NULL);

	dbgprintf("Allocating buffer for %d TCP sessions.\n", pThis->iSessMax);
	if((pThis->pSessions = (tcps_sess_t **) calloc(pThis->iSessMax, sizeof(tcps_sess_t *))) == NULL) {
		dbgprintf("Error: TCPSessInit() could not alloc memory for TCP session table.\n");
		ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
	}

finalize_it:
	RETiRet;
}


/* find a free spot in the session table. If the table
 * is full, -1 is returned, else the index of the free
 * entry (0 or higher).
 */
static int
TCPSessTblFindFreeSpot(tcpsrv_t *pThis)
{
	register int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	for(i = 0 ; i < pThis->iSessMax ; ++i) {
		if(pThis->pSessions[i] == NULL)
			break;
	}

	return((i < pThis->iSessMax) ? i : -1);
}


/* Get the next session index. Free session tables entries are
 * skipped. This function is provided the index of the last
 * session entry, or -1 if no previous entry was obtained. It
 * returns the index of the next session or -1, if there is no
 * further entry in the table. Please note that the initial call
 * might as well return -1, if there is no session at all in the
 * session table.
 */
static int
TCPSessGetNxtSess(tcpsrv_t *pThis, int iCurr)
{
	register int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	for(i = iCurr + 1 ; i < pThis->iSessMax ; ++i)
		if(pThis->pSessions[i] != NULL)
			break;

	return((i < pThis->iSessMax) ? i : -1);
}


/* De-Initialize TCP listner sockets.
 * This function deinitializes everything, including freeing the
 * session table. No TCP listen receive operations are permitted
 * unless the subsystem is reinitialized.
 * rgerhards, 2007-06-21
 */
static void deinit_tcp_listener(tcpsrv_t *pThis)
{
	int iTCPSess;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions != NULL);

	/* close all TCP connections! */
	iTCPSess = TCPSessGetNxtSess(pThis, -1);
	while(iTCPSess != -1) {
		tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
		/* now get next... */
		iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
	}
	
	/* we are done with the session table - so get rid of it...
	*/
	free(pThis->pSessions);
	pThis->pSessions = NULL; /* just to make sure... */

	/* finally close the listen sockets themselfs */
	freeAllSockets(&pThis->pSocksLstn);
}


/* Initialize TCP sockets (for listener)
 * This function returns either NULL (which means it failed) or 
 * a pointer to an array of file descriptiors. If the pointer is
 * returned, the zeroest element [0] contains the count of valid
 * descriptors. The descriptors themself follow in range
 * [1] ... [num-descriptors]. It is guaranteed that each of these
 * descriptors is valid, at least when this function returns.
 * Please note that technically the array may be larger than the number
 * of valid pointers stored in it. The memory overhead is minimal, so
 * we do not bother to re-allocate an array of the exact size. Logically,
 * the array still contains the exactly correct number of descriptors.
 */
static int *create_tcp_socket(tcpsrv_t *pThis)
{
        struct addrinfo hints, *res, *r;
        int error, maxs, *s, *socks, on = 1;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	if(!strcmp(pThis->TCPLstnPort, "0"))
		pThis->TCPLstnPort = "514";
		/* use default - we can not do service db update, because there is
		 * no IANA-assignment for syslog/tcp. In the long term, we might
		 * re-use RFC 3195 port of 601, but that would probably break to
		 * many existing configurations.
		 * rgerhards, 2007-06-28
		 */
	dbgprintf("creating tcp socket on port %s\n", pThis->TCPLstnPort);
        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
        hints.ai_family = family;
        hints.ai_socktype = SOCK_STREAM;

        error = getaddrinfo(NULL, pThis->TCPLstnPort, &hints, &res);
        if(error) {
               errmsg.LogError(NO_ERRCODE, "%s", gai_strerror(error));
	       return NULL;
	}

        /* Count max number of sockets we may open */
        for (maxs = 0, r = res; r != NULL ; r = r->ai_next, maxs++)
		/* EMPTY */;
        socks = malloc((maxs+1) * sizeof(int));
        if (socks == NULL) {
               errmsg.LogError(NO_ERRCODE, "couldn't allocate memory for TCP listen sockets, suspending TCP message reception.");
               freeaddrinfo(res);
               return NULL;
        }

        *socks = 0;   /* num of sockets counter at start of array */
        s = socks + 1;
	for (r = res; r != NULL ; r = r->ai_next) {
               *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
        	if (*s < 0) {
			if(!(r->ai_family == PF_INET6 && errno == EAFNOSUPPORT))
				errmsg.LogError(NO_ERRCODE, "create_tcp_socket(), socket");
				/* it is debatable if PF_INET with EAFNOSUPPORT should
				 * also be ignored...
				 */
                        continue;
                }

#ifdef IPV6_V6ONLY
                if (r->ai_family == AF_INET6) {
                	int iOn = 1;
			if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
			      (char *)&iOn, sizeof (iOn)) < 0) {
			errmsg.LogError(NO_ERRCODE, "TCP setsockopt");
			close(*s);
			*s = -1;
			continue;
                	}
                }
#endif
       		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
			       (char *) &on, sizeof(on)) < 0 ) {
			errmsg.LogError(NO_ERRCODE, "TCP setsockopt(REUSEADDR)");
                        close(*s);
			*s = -1;
			continue;
		}

		/* We need to enable BSD compatibility. Otherwise an attacker
		 * could flood our log files by sending us tons of ICMP errors.
		 */
#ifndef BSD	
		if(net.should_use_so_bsdcompat()) {
			if (setsockopt(*s, SOL_SOCKET, SO_BSDCOMPAT,
					(char *) &on, sizeof(on)) < 0) {
				errmsg.LogError(NO_ERRCODE, "TCP setsockopt(BSDCOMPAT)");
                                close(*s);
				*s = -1;
				continue;
			}
		}
#endif

	        if( (bind(*s, r->ai_addr, r->ai_addrlen) < 0)
#ifndef IPV6_V6ONLY
		     && (errno != EADDRINUSE)
#endif
	           ) {
                        errmsg.LogError(NO_ERRCODE, "TCP bind");
                	close(*s);
			*s = -1;
                        continue;
                }

		if( listen(*s,pThis->iSessMax / 10 + 5) < 0) {
			/* If the listen fails, it most probably fails because we ask
			 * for a too-large backlog. So in this case we first set back
			 * to a fixed, reasonable, limit that should work. Only if
			 * that fails, too, we give up.
			 */
			errmsg.LogError(NO_ERRCODE, "listen with a backlog of %d failed - retrying with default of 32.",
				    pThis->iSessMax / 10 + 5);
			if(listen(*s, 32) < 0) {
				errmsg.LogError(NO_ERRCODE, "TCP listen, suspending tcp inet");
	                	close(*s);
				*s = -1;
               		        continue;
			}
		}

		(*socks)++;
		s++;
	}

        if(res != NULL)
               freeaddrinfo(res);

	if(Debug && *socks != maxs)
		dbgprintf("We could initialize %d TCP listen sockets out of %d we received "
		 	"- this may or may not be an error indication.\n", *socks, maxs);

        if(*socks == 0) {
		errmsg.LogError(NO_ERRCODE, "No TCP listen socket could successfully be initialized, "
			 "message reception via TCP disabled.\n");
        	free(socks);
		return(NULL);
	}

	/* OK, we had success. Now it is also time to
	 * initialize our connections
	 */
	if(TCPSessTblInit(pThis) != 0) {
		/* OK, we are in some trouble - we could not initialize the
		 * session table, so we can not continue. We need to free all
		 * we have assigned so far, because we can not really use it...
		 */
		errmsg.LogError(NO_ERRCODE, "Could not initialize TCP session table, suspending TCP message reception.");
		freeAllSockets(&socks); /* prevent a socket leak */
		return(NULL);
	}

	return(socks);
}


/* Accept new TCP connection; make entry in session table. If there
 * is no more space left in the connection table, the new TCP
 * connection is immediately dropped.
 * ppSess has a pointer to the newly created session, if it succeds.
 * If it does not succeed, no session is created and ppSess is
 * undefined. If the user has provided an OnSessAccept Callback,
 * this one is executed immediately after creation of the 
 * session object, so that it can do its own initializatin.
 * rgerhards, 2008-03-02
 */
static rsRetVal
SessAccept(tcpsrv_t *pThis, tcps_sess_t **ppSess, int fd)
{
	DEFiRet;
	tcps_sess_t *pSess;
	int newConn;
	int iSess = -1;
	struct sockaddr_storage addr;
	socklen_t addrlen = sizeof(struct sockaddr_storage);
	uchar fromHost[NI_MAXHOST];
	uchar fromHostFQDN[NI_MAXHOST];

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	newConn = accept(fd, (struct sockaddr*) &addr, &addrlen);
	if (newConn < 0) {
		errmsg.LogError(NO_ERRCODE, "tcp accept, ignoring error and connection request");
		ABORT_FINALIZE(RS_RET_ERR); // TODO: better error code
		//was: return -1;
	}

	/* Add to session list */
	iSess = TCPSessTblFindFreeSpot(pThis);
	if(iSess == -1) {
		errno = 0;
		errmsg.LogError(NO_ERRCODE, "too many tcp sessions - dropping incoming request");
		close(newConn);
		ABORT_FINALIZE(RS_RET_ERR); // TODO: better error code
		//was: return -1;
	} else {
		/* we found a free spot and can construct our session object */
		CHKiRet(tcps_sess.Construct(&pSess));
		CHKiRet(tcps_sess.SetTcpsrv(pSess, pThis));
	}

	/* OK, we have a "good" index... */
	/* get the host name */
	if(net.cvthname(&addr, fromHost, fromHostFQDN) != RS_RET_OK) {
		/* we seem to have something malicous - at least we
		 * are now told to discard the connection request.
		 * Error message has been generated by cvthname.
		 */
		close (newConn);
		ABORT_FINALIZE(RS_RET_ERR); // TODO: better error code
		//was: return -1;
	}

	/* 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).
	 * rgerhards, 2005-09-26
	 */
	if(!pThis->pIsPermittedHost((struct sockaddr*) &addr, (char*) fromHostFQDN, pThis->pUsr, (*ppSess)->pUsr)) {
		dbgprintf("%s is not an allowed sender\n", (char *) fromHostFQDN);
		if(option_DisallowWarning) {
			errno = 0;
			errmsg.LogError(NO_ERRCODE, "TCP message from disallowed sender %s discarded",
				   (char*)fromHost);
		}
		close(newConn);
		ABORT_FINALIZE(RS_RET_HOST_NOT_PERMITTED);
	}

	/* OK, we have an allowed sender, so let's continue, what
	 * means we can finally fill in the session object.
	 */
	CHKiRet(tcps_sess.SetHost(pSess, fromHost));
	CHKiRet(tcps_sess.SetSock(pSess, newConn));
	CHKiRet(tcps_sess.SetMsgIdx(pSess, 0));
	CHKiRet(tcps_sess.ConstructFinalize(pSess));

	/* check if we need to call our callback */
	if(pThis->pOnSessAccept != NULL) {
		CHKiRet(pThis->pOnSessAccept(pThis, pSess));
	}

	*ppSess = pSess;
	pThis->pSessions[iSess] = pSess;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(iSess != -1) {
			if(pThis->pSessions[iSess] != NULL)
				tcps_sess.Destruct(&pThis->pSessions[iSess]);
		}
		iSess = -1; // TODO: change this to be fully iRet compliant ;)
	}

	RETiRet;
}


/* This function is called to gather input.
 */
static rsRetVal
Run(tcpsrv_t *pThis)
{
	DEFiRet;
	int maxfds;
	int nfds;
	int i;
	int iTCPSess;
	fd_set readfds;
	tcps_sess_t *pNewSess;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* this is an endless loop - it is terminated when the thread is
	 * signalled to do so. This, however, is handled by the framework,
	 * right into the sleep below.
	 */
	while(1) {
	        maxfds = 0;
	        FD_ZERO (&readfds);

		/* Add the TCP listen sockets to the list of read descriptors.
	    	 */
		if(pThis->pSocksLstn != NULL && *pThis->pSocksLstn) {
			for (i = 0; i < *pThis->pSocksLstn; i++) {
				/* The if() below is theoretically not needed, but I leave it in
				 * so that a socket may become unsuable during execution. That
				 * feature is not yet supported by the current code base.
				 */
				if (pThis->pSocksLstn[i+1] != -1) {
					if(Debug)
						net.debugListenInfo(pThis->pSocksLstn[i+1], "TCP");
					FD_SET(pThis->pSocksLstn[i+1], &readfds);
					if(pThis->pSocksLstn[i+1]>maxfds) maxfds=pThis->pSocksLstn[i+1];
				}
			}
			/* do the sessions */
			iTCPSess = TCPSessGetNxtSess(pThis, -1);
			while(iTCPSess != -1) {
				int fdSess;
				fdSess = pThis->pSessions[iTCPSess]->sock; // TODO: NOT CLEAN!, use method
				dbgprintf("Adding TCP Session %d\n", fdSess);
				FD_SET(fdSess, &readfds);
				if (fdSess>maxfds) maxfds=fdSess;
				/* now get next... */
				iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
			}
		}

		if(Debug) {
			// TODO: name in dbgprintf!
			dbgprintf("--------<TCPSRV> 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);

		for (i = 0; i < *pThis->pSocksLstn; i++) {
			if (FD_ISSET(pThis->pSocksLstn[i+1], &readfds)) {
				dbgprintf("New connect on TCP inetd socket: #%d\n", pThis->pSocksLstn[i+1]);
				//pThis->pOnSessAccept(pThis, &pNewSess, pThis->pSocksLstn[i+1]);
				SessAccept(pThis, &pNewSess, pThis->pSocksLstn[i+1]);
				--nfds; /* indicate we have processed one */
			}
		}

		/* now check the sessions */
		iTCPSess = TCPSessGetNxtSess(pThis, -1);
		while(nfds && iTCPSess != -1) {
			int fdSess;
			int state;
			fdSess = pThis->pSessions[iTCPSess]->sock; // TODO: not clean, use method
			if(FD_ISSET(fdSess, &readfds)) {
				char buf[MAXLINE];
				dbgprintf("tcp session socket with new data: #%d\n", fdSess);

				/* Receive message */
				state = pThis->pRcvData(pThis->pSessions[iTCPSess], buf, sizeof(buf));
				if(state == 0) {
					pThis->pOnRegularClose(pThis->pSessions[iTCPSess]);
					tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
				} else if(state == -1) {
					errmsg.LogError(NO_ERRCODE, "TCP session %d will be closed, error ignored\n", fdSess);
					pThis->pOnErrClose(pThis->pSessions[iTCPSess]);
					tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
				} else {
					/* valid data received, process it! */
					if(tcps_sess.DataRcvd(pThis->pSessions[iTCPSess], buf, state) == 0) {
						/* in this case, something went awfully wrong.
						 * We are instructed to terminate the session.
						 */
						errmsg.LogError(NO_ERRCODE, "Tearing down TCP Session %d - see "
							    "previous messages for reason(s)\n",
							    iTCPSess);
						pThis->pOnErrClose(pThis->pSessions[iTCPSess]);
						tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
					}
				}
				--nfds; /* indicate we have processed one */
			}
			iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
		}
	}

	RETiRet;
}


/* Standard-Constructor
 */
BEGINobjConstruct(tcpsrv) /* be sure to specify the object type also in END macro! */
	pThis->pSocksLstn = NULL;
	pThis->iSessMax = 200; /* TODO: useful default ;) */
ENDobjConstruct(tcpsrv)


/* ConstructionFinalizer
 */
static rsRetVal
tcpsrvConstructFinalize(tcpsrv_t __attribute__((unused)) *pThis)
{
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, tcpsrv);
	pThis->pSocksLstn = pThis->OpenLstnSocks(pThis);

	RETiRet;
}


/* destructor for the tcpsrv object */
BEGINobjDestruct(tcpsrv) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(tcpsrv)
	if(pThis->OnDestruct != NULL)
		pThis->OnDestruct(pThis->pUsr);

	deinit_tcp_listener(pThis);
ENDobjDestruct(tcpsrv)


/* debugprint for the tcpsrv object */
BEGINobjDebugPrint(tcpsrv) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDebugPrint(tcpsrv)
ENDobjDebugPrint(tcpsrv)

/* set functions */
static rsRetVal
SetCBIsPermittedHost(tcpsrv_t *pThis, int (*pCB)(struct sockaddr *addr, char *fromHostFQDN, void*, void*))
{
	DEFiRet;
	pThis->pIsPermittedHost = pCB;
	RETiRet;
}

static rsRetVal
SetCBRcvData(tcpsrv_t *pThis, int (*pRcvData)(tcps_sess_t*, char*, size_t))
{
	DEFiRet;
	pThis->pRcvData = pRcvData;
	RETiRet;
}

static rsRetVal
SetCBOnListenDeinit(tcpsrv_t *pThis, int (*pCB)(void*))
{
	DEFiRet;
	pThis->pOnListenDeinit = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessAccept(tcpsrv_t *pThis, rsRetVal (*pCB)(tcpsrv_t*, tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnSessAccept = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnDestruct(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->OnDestruct = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessConstructFinalize(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->OnSessConstructFinalize = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessDestruct(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->pOnSessDestruct = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnRegularClose(tcpsrv_t *pThis, rsRetVal (*pCB)(tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnRegularClose = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnErrClose(tcpsrv_t *pThis, rsRetVal (*pCB)(tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnErrClose = pCB;
	RETiRet;
}

static rsRetVal
SetCBOpenLstnSocks(tcpsrv_t *pThis, int* (*pCB)(tcpsrv_t*))
{
	DEFiRet;
	pThis->OpenLstnSocks = pCB;
	RETiRet;
}

static rsRetVal
SetUsrP(tcpsrv_t *pThis, void *pUsr)
{
	DEFiRet;
	pThis->pUsr = pUsr;
	RETiRet;
}


/* queryInterface function
 * rgerhards, 2008-02-29
 */
BEGINobjQueryInterface(tcpsrv)
CODESTARTobjQueryInterface(tcpsrv)
	if(pIf->ifVersion != tcpsrvCURR_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->DebugPrint = tcpsrvDebugPrint;
	pIf->Construct = tcpsrvConstruct;
	pIf->ConstructFinalize = tcpsrvConstructFinalize;
	pIf->Destruct = tcpsrvDestruct;

	pIf->SessAccept = SessAccept;
	pIf->configureTCPListen = configureTCPListen;
	pIf->create_tcp_socket = create_tcp_socket;
	pIf->Run = Run;

	pIf->SetUsrP = SetUsrP;
	pIf->SetCBIsPermittedHost = SetCBIsPermittedHost;
	pIf->SetCBOpenLstnSocks = SetCBOpenLstnSocks;
	pIf->SetCBRcvData = SetCBRcvData;
	pIf->SetCBOnListenDeinit = SetCBOnListenDeinit;
	pIf->SetCBOnSessAccept = SetCBOnSessAccept;
	pIf->SetCBOnSessConstructFinalize = SetCBOnSessConstructFinalize;
	pIf->SetCBOnSessDestruct = SetCBOnSessDestruct;
	pIf->SetCBOnDestruct = SetCBOnDestruct;
	pIf->SetCBOnRegularClose = SetCBOnRegularClose;
	pIf->SetCBOnErrClose = SetCBOnErrClose;

finalize_it:
ENDobjQueryInterface(tcpsrv)


/* exit our class
 * rgerhards, 2008-03-10
 */
BEGINObjClassExit(tcpsrv, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(tcpsrv)
	/* release objects we no longer need */
	objRelease(tcps_sess, DONT_LOAD_LIB);
	objRelease(conf, CORE_COMPONENT);
	objRelease(errmsg, CORE_COMPONENT);
	objRelease(net, LM_NET_FILENAME);
ENDObjClassExit(tcpsrv)


/* Initialize our class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-02-29
 */
BEGINObjClassInit(tcpsrv, 1, OBJ_IS_LOADABLE_MODULE) /* class, version - CHANGE class also in END MACRO! */
	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
	CHKiRet(objUse(net, LM_NET_FILENAME));
	CHKiRet(objUse(tcps_sess, DONT_LOAD_LIB));
	CHKiRet(objUse(conf, CORE_COMPONENT));

	/* set our own handlers */
	OBJSetMethodHandler(objMethod_DEBUGPRINT, tcpsrvDebugPrint);
	OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, tcpsrvConstructFinalize);
ENDObjClassInit(tcpsrv)


/* --------------- here now comes the plumbing that makes as a library module --------------- */


BEGINmodExit
CODESTARTmodExit
	/* de-init in reverse order! */
	tcpsrvClassExit();
	tcps_sessClassExit();
ENDmodExit


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt


BEGINmodInit()
CODESTARTmodInit
	*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */

	/* Initialize all classes that are in our module - this includes ourselfs */
	CHKiRet(tcps_sessClassInit(pModInfo));
	CHKiRet(tcpsrvClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
ENDmodInit

/* vim:set ai:
 */