summaryrefslogtreecommitdiff
path: root/runtime/net.c
blob: 5cafe5227b93757123147a6dcd5d0edabbdf7a20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
/* net.c
 * Implementation of network-related stuff.
 *
 * 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" networking code without any modifications. However, it
 * helps to have things at the right place one we go to the meat of it.
 *
 * Starting 2007-12-24, I have begun to shuffle more network-related code
 * from syslogd.c to over here. I am not sure if it will stay here in the
 * long term, but it is good to have it out of syslogd.c. Maybe this here is
 * an interim location ;)
 *
 * Copyright 2007, 2008 Rainer Gerhards and Adiscon GmbH.
 *
 * rgerhards, 2008-04-16: I changed this code to LGPL today. I carefully analyzed
 * that it does not borrow code from the original sysklogd and that I have 
 * permission to do so from all other contributors. My analysis found that all
 * code from sysklogd has been superseeded by our own functionality, so it 
 * is OK to move this file to LGPL. Some variable sysklogd variable names
 * remain, but even this will change as the net object evolves.
 *
 * This file is part of the rsyslog runtime library.
 *
 * The rsyslog runtime library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The rsyslog runtime library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the rsyslog runtime library.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 * A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
 */
#include "config.h"

#include "rsyslog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>
#include <netdb.h>
#include <fnmatch.h>
#include <fcntl.h>
#include <unistd.h>

#include "syslogd-types.h"
#include "module-template.h"
#include "parse.h"
#include "srUtils.h"
#include "obj.h"
#include "errmsg.h"
#include "net.h"

#ifdef OS_SOLARIS
#	define	s6_addr32	_S6_un._S6_u32
	typedef unsigned int	u_int32_t;
#endif

MODULE_TYPE_LIB

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

/* support for defining allowed TCP and UDP senders. We use the same
 * structure to implement this (a linked list), but we define two different
 * list roots, one for UDP and one for TCP.
 * rgerhards, 2005-09-26
 */
/* All of the five below are read-only after startup */
struct AllowedSenders *pAllowedSenders_UDP = NULL; /* the roots of the allowed sender */
struct AllowedSenders *pAllowedSenders_TCP = NULL; /* lists. If NULL, all senders are ok! */
static struct AllowedSenders *pLastAllowedSenders_UDP = NULL; /* and now the pointers to the last */
static struct AllowedSenders *pLastAllowedSenders_TCP = NULL; /* element in the respective list */
#ifdef USE_GSSAPI
struct AllowedSenders *pAllowedSenders_GSS = NULL;
static struct AllowedSenders *pLastAllowedSenders_GSS = NULL;
#endif

int     ACLAddHostnameOnFail = 0; /* add hostname to acl when DNS resolving has failed */
int     ACLDontResolve = 0;       /* add hostname to acl instead of resolving it to IP(s) */


/* ------------------------------ begin permitted peers code ------------------------------ */


/* sets the correct allow root pointer based on provided type
 * rgerhards, 2008-12-01
 */
static inline rsRetVal
setAllowRoot(struct AllowedSenders **ppAllowRoot, uchar *pszType)
{
	DEFiRet;

	if(!strcmp((char*)pszType, "UDP"))
		*ppAllowRoot = pAllowedSenders_UDP;
	else if(!strcmp((char*)pszType, "TCP"))
		*ppAllowRoot = pAllowedSenders_TCP;
#ifdef USE_GSSAPI
	else if(!strcmp((char*)pszType, "GSS"))
		*ppAllowRoot = pAllowedSenders_GSS;
#endif
	else {
		dbgprintf("program error: invalid allowed sender ID '%s', denying...\n", pszType);
		ABORT_FINALIZE(RS_RET_CODE_ERR); /* everything is invalid for an invalid type */
	}

finalize_it:
	RETiRet;
}
/* re-initializes (sets to NULL) the correct allow root pointer
 * rgerhards, 2009-01-12
 */
static inline rsRetVal
reinitAllowRoot(uchar *pszType)
{
	DEFiRet;

	if(!strcmp((char*)pszType, "UDP"))
		pAllowedSenders_UDP = NULL;
	else if(!strcmp((char*)pszType, "TCP"))
		pAllowedSenders_TCP = NULL;
#ifdef USE_GSSAPI
	else if(!strcmp((char*)pszType, "GSS"))
		pAllowedSenders_GSS = NULL;
#endif
	else {
		dbgprintf("program error: invalid allowed sender ID '%s', denying...\n", pszType);
		ABORT_FINALIZE(RS_RET_CODE_ERR); /* everything is invalid for an invalid type */
	}

finalize_it:
	RETiRet;
}


/* add a wildcard entry to this permitted peer. Entries are always
 * added at the tail of the list. pszStr and lenStr identify the wildcard
 * entry to be added. Note that the string is NOT \0 terminated, so
 * we must rely on lenStr for when it is finished.
 * rgerhards, 2008-05-27
 */
static rsRetVal
AddPermittedPeerWildcard(permittedPeers_t *pPeer, uchar* pszStr, size_t lenStr)
{
	permittedPeerWildcard_t *pNew = NULL;
	size_t iSrc;
	size_t iDst;
	DEFiRet;

	assert(pPeer != NULL);
	assert(pszStr != NULL);

	CHKmalloc(pNew = calloc(1, sizeof(permittedPeers_t)));

	if(lenStr == 0) { /* empty domain components are permitted */
		pNew->wildcardType = PEER_WILDCARD_EMPTY_COMPONENT;
		FINALIZE;
	} else {
		/* alloc memory for the domain component. We may waste a byte or
		 * two, but that's ok.
		 */
		CHKmalloc(pNew->pszDomainPart = malloc(lenStr +1 ));
	}

	if(pszStr[0] == '*') {
		pNew->wildcardType = PEER_WILDCARD_AT_START;
		iSrc = 1; /* skip '*' */
	} else {
		iSrc = 0;
	}

	for(iDst = 0 ; iSrc < lenStr && pszStr[iSrc] != '*' ; ++iSrc, ++iDst)  {
		pNew->pszDomainPart[iDst] = pszStr[iSrc];
	}

	if(iSrc < lenStr) {
		if(iSrc + 1 == lenStr && pszStr[iSrc] == '*') {
			if(pNew->wildcardType == PEER_WILDCARD_AT_START) {
				ABORT_FINALIZE(RS_RET_INVALID_WILDCARD);
			} else {
				pNew->wildcardType = PEER_WILDCARD_AT_END;
			}
		} else {
			/* we have an invalid wildcard, something follows the asterisk! */
			ABORT_FINALIZE(RS_RET_INVALID_WILDCARD);
		}
	}

	if(lenStr == 1 && pNew->wildcardType == PEER_WILDCARD_AT_START) {
		pNew->wildcardType = PEER_WILDCARD_MATCH_ALL;
	}

	/* if we reach this point, we had a valid wildcard. We now need to
	 * properly terminate the domain component string.
	 */
	pNew->pszDomainPart[iDst] = '\0';
	pNew->lenDomainPart = strlen((char*)pNew->pszDomainPart);

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pNew != NULL) {
			if(pNew->pszDomainPart != NULL)
				free(pNew->pszDomainPart);
			free(pNew);
		}
	} else {
		/* enqueue the element */
		if(pPeer->pWildcardRoot == NULL) {
			pPeer->pWildcardRoot = pNew;
		} else {
			pPeer->pWildcardLast->pNext = pNew;
		}
		pPeer->pWildcardLast = pNew;
	}

	RETiRet;
}


/* Destruct a permitted peer's wildcard list -- rgerhards, 2008-05-27 */
static rsRetVal
DestructPermittedPeerWildcards(permittedPeers_t *pPeer)
{
	permittedPeerWildcard_t *pCurr;
	permittedPeerWildcard_t *pDel;
	DEFiRet;

	assert(pPeer != NULL);

	for(pCurr = pPeer->pWildcardRoot ; pCurr != NULL ; /*EMPTY*/) {
		pDel = pCurr;
		pCurr = pCurr->pNext;
		free(pDel->pszDomainPart);
		free(pDel);
	}

	pPeer->pWildcardRoot = NULL;
	pPeer->pWildcardLast = NULL;

	RETiRet;
}


/* add a permitted peer. PermittedPeers is an interim solution until we can provide
 * access control via enhanced RainerScript methods.
 * Note: the provided string is handed over to this function, caller must
 * no longer access it. -- rgerhards, 2008-05-19
 */
static rsRetVal
AddPermittedPeer(permittedPeers_t **ppRootPeer, uchar* pszID)
{
	permittedPeers_t *pNew = NULL;
	DEFiRet;

	assert(ppRootPeer != NULL);
	assert(pszID != NULL);

	CHKmalloc(pNew = calloc(1, sizeof(permittedPeers_t))); /* we use calloc() for consistency with "real" objects */
	CHKmalloc(pNew->pszID = (uchar*)strdup((char*)pszID));

	if(*ppRootPeer != NULL) {
		pNew->pNext = *ppRootPeer;
	}
	*ppRootPeer = pNew;
		
finalize_it:
	if(iRet != RS_RET_OK) {
		if(pNew != NULL)
			free(pNew);
	}
	RETiRet;
}


/* Destruct a permitted peers list -- rgerhards, 2008-05-19 */
static rsRetVal
DestructPermittedPeers(permittedPeers_t **ppRootPeer)
{
	permittedPeers_t *pCurr;
	permittedPeers_t *pDel;
	DEFiRet;

	assert(ppRootPeer != NULL);

	for(pCurr = *ppRootPeer ; pCurr != NULL ; /*EMPTY*/) {
		pDel = pCurr;
		pCurr = pCurr->pNext;
		DestructPermittedPeerWildcards(pDel);
		free(pDel->pszID);
		free(pDel);
	}

	*ppRootPeer = NULL;

	RETiRet;
}


/* Compile a wildcard. The function first checks if there is a wildcard
 * present and compiles it only if so ;) It sets the etryType status
 * accordingly.
 * rgerhards, 2008-05-27
 */
static rsRetVal
PermittedPeerWildcardCompile(permittedPeers_t *pPeer)
{
	uchar *pC;
	uchar *pStart;
	DEFiRet;

	assert(pPeer != NULL);
	assert(pPeer->pszID != NULL);

	/* first check if we have a wildcard */
	for(pC = pPeer->pszID ; *pC != '\0' && *pC != '*' ; ++pC)
		/*EMPTY, just skip*/;

	if(*pC == '\0') {
		/* no wildcard found, we are mostly done */
		pPeer->etryType = PERM_PEER_TYPE_PLAIN;
		FINALIZE;
	}

	/* if we reach this point, the string contains wildcards. So let's
	 * compile the structure. To do so, we must parse from dot to dot
	 * and create a wildcard entry for each domain component we find.
	 * We must also flag problems if we have an asterisk in the middle
	 * of the text (it is supported at the start or end only).
	 */
	pPeer->etryType = PERM_PEER_TYPE_WILDCARD;
	pC = pPeer->pszID;
	while(*pC != '\0') {
		pStart = pC;
		/* find end of domain component */
		for( ; *pC != '\0' && *pC != '.' ; ++pC)
			/*EMPTY, just skip*/;
		CHKiRet(AddPermittedPeerWildcard(pPeer, pStart, pC - pStart));
		/* now check if we have an empty component at end of string */
		if(*pC == '.' && *(pC + 1) == '\0') {
			/* pStart is a dummy, it is not used if length is 0 */
			CHKiRet(AddPermittedPeerWildcard(pPeer, pStart, 0)); 
		}
		if(*pC != '\0')
			++pC;
	}

finalize_it:
	if(iRet != RS_RET_OK) {
		errmsg.LogError(0, iRet, "error compiling wildcard expression '%s'",
			 pPeer->pszID);
	}
	RETiRet;
}


/* Do a (potential) wildcard match. The function first checks if the wildcard
 * has already been compiled and, if not, compiles it. If the peer entry in
 * question does NOT contain a wildcard, a simple strcmp() is done.
 * *pbIsMatching is set to 0 if there is no match and something else otherwise.
 * rgerhards, 2008-05-27 */
static rsRetVal
PermittedPeerWildcardMatch(permittedPeers_t *pPeer, uchar *pszNameToMatch, int *pbIsMatching)
{
	permittedPeerWildcard_t *pWildcard;
	uchar *pC;
	uchar *pStart; /* start of current domain component */
	size_t iWildcard, iName; /* work indexes for backward comparisons */
	DEFiRet;

	assert(pPeer != NULL);
	assert(pszNameToMatch != NULL);
	assert(pbIsMatching != NULL);

	if(pPeer->etryType == PERM_PEER_TYPE_UNDECIDED) {
		PermittedPeerWildcardCompile(pPeer);
	}

	if(pPeer->etryType == PERM_PEER_TYPE_PLAIN) {
		*pbIsMatching = !strcmp((char*)pPeer->pszID, (char*)pszNameToMatch);
		FINALIZE;
	}

	/* we have a wildcard, so we need to extract the domain components and
	 * check then against the provided wildcards.
	 */
	pWildcard = pPeer->pWildcardRoot;
	pC = pszNameToMatch;
	while(*pC != '\0') {
		if(pWildcard == NULL) {
			/* we have more domain components than we have wildcards --> no match */
			*pbIsMatching = 0;
			FINALIZE;
		}
		pStart = pC;
		while(*pC != '\0' && *pC != '.') {
			++pC;
		}

		/* got the component, now do the match */
		switch(pWildcard->wildcardType) {
			case PEER_WILDCARD_NONE:
				if(   pWildcard->lenDomainPart != (size_t) (pC - pStart)
				   || strncmp((char*)pStart, (char*)pWildcard->pszDomainPart, pC - pStart)) {
					*pbIsMatching = 0;
					FINALIZE;
				}
				break;
			case PEER_WILDCARD_AT_START:
				/* we need to do the backwards-matching manually */
				if(pWildcard->lenDomainPart > (size_t) (pC - pStart)) {
					*pbIsMatching = 0;
					FINALIZE;
				}
				iName = (size_t) (pC - pStart) - pWildcard->lenDomainPart;
				iWildcard = 0;
				while(iWildcard < pWildcard->lenDomainPart) {
					if(pWildcard->pszDomainPart[iWildcard] != pStart[iName]) {
						*pbIsMatching = 0;
						FINALIZE;
					}
					++iName;
					++iWildcard;
				}
				break;
			case PEER_WILDCARD_AT_END:
				if(   pWildcard->lenDomainPart > (size_t) (pC - pStart)
				   || strncmp((char*)pStart, (char*)pWildcard->pszDomainPart, pWildcard->lenDomainPart)) {
					*pbIsMatching = 0;
					FINALIZE;
				}
				break;
			case PEER_WILDCARD_MATCH_ALL:
				/* everything is OK, just continue */
				break;
			case PEER_WILDCARD_EMPTY_COMPONENT:
				if(pC - pStart > 0) {
				   	/* if it is not empty, it is no match... */
					*pbIsMatching = 0;
					FINALIZE;
				}
				break;
		}
		pWildcard =  pWildcard->pNext; /* we processed this entry */

		/* skip '.' if we had it and so prepare for next iteration */
		if(*pC == '.')
			++pC;
	}

	if(pWildcard != NULL) {
		/* we have more domain components than in the name to be
		 * checked. So this is no match.
		 */
		*pbIsMatching = 0;
		FINALIZE;
	}

	*pbIsMatching = 1; /* finally... it matches ;) */

finalize_it:
	RETiRet;
}


/* ------------------------------ end permitted peers code ------------------------------ */


/* Code for handling allowed/disallowed senders
 */
static inline void MaskIP6 (struct in6_addr *addr, uint8_t bits) {
	register uint8_t i;
	
	assert (addr != NULL);
	assert (bits <= 128);
	
	i = bits/32;
	if (bits%32)
		addr->s6_addr32[i++] &= htonl(0xffffffff << (32 - (bits % 32)));
	for (; i < (sizeof addr->s6_addr32)/4; i++)
		addr->s6_addr32[i] = 0;
}

static inline void MaskIP4 (struct in_addr  *addr, uint8_t bits) {
	
	assert (addr != NULL);
	assert (bits <=32 );
	
	addr->s_addr &= htonl(0xffffffff << (32 - bits));
}

#define SIN(sa)  ((struct sockaddr_in  *)(sa))
#define SIN6(sa) ((struct sockaddr_in6 *)(sa))


/* This is a cancel-safe getnameinfo() version, because we learned
 * (via drd/valgrind) that getnameinfo() seems to have some issues
 * when being cancelled, at least if the module was dlloaded.
 * rgerhards, 2008-09-30
 */
static inline int
mygetnameinfo(const struct sockaddr *sa, socklen_t salen,
                       char *host, size_t hostlen,
                       char *serv, size_t servlen, int flags)
{
	int iCancelStateSave;
	int i;

	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &iCancelStateSave);
	i = getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
	pthread_setcancelstate(iCancelStateSave, NULL);
	return i;
}


/* This function adds an allowed sender entry to the ACL linked list.
 * In any case, a single entry is added. If an error occurs, the
 * function does its error reporting itself. All validity checks
 * must already have been done by the caller.
 * This is a helper to AddAllowedSender().
 * rgerhards, 2007-07-17
 */
static rsRetVal AddAllowedSenderEntry(struct AllowedSenders **ppRoot, struct AllowedSenders **ppLast,
		     		      struct NetAddr *iAllow, uint8_t iSignificantBits)
{
	struct AllowedSenders *pEntry = NULL;

	assert(ppRoot != NULL);
	assert(ppLast != NULL);
	assert(iAllow != NULL);

	if((pEntry = (struct AllowedSenders*) calloc(1, sizeof(struct AllowedSenders))) == NULL) {
		return RS_RET_OUT_OF_MEMORY; /* no options left :( */
	}
	
	memcpy(&(pEntry->allowedSender), iAllow, sizeof (struct NetAddr));
	pEntry->pNext = NULL;
	pEntry->SignificantBits = iSignificantBits;
	
	/* enqueue */
	if(*ppRoot == NULL) {
		*ppRoot = pEntry;
	} else {
		(*ppLast)->pNext = pEntry;
	}
	*ppLast = pEntry;
	
	return RS_RET_OK;
}

/* function to clear the allowed sender structure in cases where
 * it must be freed (occurs most often when HUPed).
 * rgerhards, 2008-12-02: revamped this code when we fixed the interface
 * definition. Now an iterative algorithm is used.
 */
static void
clearAllowedSenders(uchar *pszType)
{
	struct AllowedSenders *pPrev;
	struct AllowedSenders *pCurr;

	if(setAllowRoot(&pCurr, pszType) != RS_RET_OK)
		return;	/* if something went wrong, so let's leave */
	
	while(pCurr != NULL) {
		pPrev = pCurr;
		pCurr = pCurr->pNext;
		/* now delete the entry we are right now processing */
		if(F_ISSET(pPrev->allowedSender.flags, ADDR_NAME))
			free(pPrev->allowedSender.addr.HostWildcard);
		else
			free(pPrev->allowedSender.addr.NetAddr);
		free(pPrev);
	}

	/* indicate root pointer is de-init (was forgotten previously, resulting in
	 * all kinds of interesting things) -- rgerhards, 2009-01-12
	 */
	reinitAllowRoot(pszType);
}


/* function to add an allowed sender to the allowed sender list. The
 * root of the list is caller-provided, so it can be used for all
 * supported lists. The caller must provide a pointer to the root,
 * as it eventually needs to be updated. Also, a pointer to the
 * pointer to the last element must be provided (to speed up adding
 * list elements).
 * rgerhards, 2005-09-26
 * If a hostname is given there are possible multiple entries
 * added (all addresses from that host).
 */
static rsRetVal AddAllowedSender(struct AllowedSenders **ppRoot, struct AllowedSenders **ppLast,
		     		 struct NetAddr *iAllow, uint8_t iSignificantBits)
{
	DEFiRet;

	assert(ppRoot != NULL);
	assert(ppLast != NULL);
	assert(iAllow != NULL);

	if (!F_ISSET(iAllow->flags, ADDR_NAME)) {
		if(iSignificantBits == 0)
			/* we handle this seperatly just to provide a better
			 * error message.
			 */
			errmsg.LogError(0, NO_ERRCODE, "You can not specify 0 bits of the netmask, this would "
				 "match ALL systems. If you really intend to do that, "
				 "remove all $AllowedSender directives.");
		
		switch (iAllow->addr.NetAddr->sa_family) {
		case AF_INET:
			if((iSignificantBits < 1) || (iSignificantBits > 32)) {
				errmsg.LogError(0, NO_ERRCODE, "Invalid number of bits (%d) in IPv4 address - adjusted to 32",
					    (int)iSignificantBits);
				iSignificantBits = 32;
			}
			
			MaskIP4 (&(SIN(iAllow->addr.NetAddr)->sin_addr), iSignificantBits);
			break;
		case AF_INET6:
			if((iSignificantBits < 1) || (iSignificantBits > 128)) {
				errmsg.LogError(0, NO_ERRCODE, "Invalid number of bits (%d) in IPv6 address - adjusted to 128",
					    iSignificantBits);
				iSignificantBits = 128;
			}

			MaskIP6 (&(SIN6(iAllow->addr.NetAddr)->sin6_addr), iSignificantBits);
			break;
		default:
			/* rgerhards, 2007-07-16: We have an internal program error in this
			 * case. However, there is not much we can do against it right now. Of
			 * course, we could abort, but that would probably cause more harm
			 * than good. So we continue to run. We simply do not add this line - the
			 * worst thing that happens is that one host will not be allowed to
			 * log.
			 */
			errmsg.LogError(0, NO_ERRCODE, "Internal error caused AllowedSender to be ignored, AF = %d",
				    iAllow->addr.NetAddr->sa_family);
			ABORT_FINALIZE(RS_RET_ERR);
		}
		/* OK, entry constructed, now lets add it to the ACL list */
		iRet = AddAllowedSenderEntry(ppRoot, ppLast, iAllow, iSignificantBits);
	} else {
		/* we need to process a hostname ACL */
		if(glbl.GetDisableDNS()) {
			errmsg.LogError(0, NO_ERRCODE, "Ignoring hostname based ACLs because DNS is disabled.");
			ABORT_FINALIZE(RS_RET_OK);
		}
		
		if (!strchr (iAllow->addr.HostWildcard, '*') &&
		    !strchr (iAllow->addr.HostWildcard, '?') &&
		    ACLDontResolve == 0) {
			/* single host - in this case, we pull its IP addresses from DNS
			* and add IP-based ACLs.
			*/
			struct addrinfo hints, *res, *restmp;
			struct NetAddr allowIP;
			
			memset (&hints, 0, sizeof (struct addrinfo));
			hints.ai_family = AF_UNSPEC;
			hints.ai_socktype = SOCK_DGRAM;
#			ifdef AI_ADDRCONFIG /* seems not to be present on all systems */
				hints.ai_flags  = AI_ADDRCONFIG;
#			endif

			if (getaddrinfo (iAllow->addr.HostWildcard, NULL, &hints, &res) != 0) {
			        errmsg.LogError(0, NO_ERRCODE, "DNS error: Can't resolve \"%s\"", iAllow->addr.HostWildcard);
				
				if (ACLAddHostnameOnFail) {
				        errmsg.LogError(0, NO_ERRCODE, "Adding hostname \"%s\" to ACL as a wildcard entry.", iAllow->addr.HostWildcard);
				        iRet = AddAllowedSenderEntry(ppRoot, ppLast, iAllow, iSignificantBits);
					FINALIZE;
				} else {
				        errmsg.LogError(0, NO_ERRCODE, "Hostname \"%s\" WON\'T be added to ACL.", iAllow->addr.HostWildcard);
				        ABORT_FINALIZE(RS_RET_NOENTRY);
				}
			}
			
			for (restmp = res ; res != NULL ; res = res->ai_next) {
				switch (res->ai_family) {
				case AF_INET: /* add IPv4 */
					iSignificantBits = 32;
					allowIP.flags = 0;
					if((allowIP.addr.NetAddr = malloc(res->ai_addrlen)) == NULL) {
						ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
					}
					memcpy(allowIP.addr.NetAddr, res->ai_addr, res->ai_addrlen);
					
					if((iRet = AddAllowedSenderEntry(ppRoot, ppLast, &allowIP, iSignificantBits))
						!= RS_RET_OK)
						FINALIZE;
					break;
				case AF_INET6: /* IPv6 - but need to check if it is a v6-mapped IPv4 */
					if(IN6_IS_ADDR_V4MAPPED (&SIN6(res->ai_addr)->sin6_addr)) {
						/* extract & add IPv4 */
						
						iSignificantBits = 32;
						allowIP.flags = 0;
						if((allowIP.addr.NetAddr = malloc(sizeof(struct sockaddr_in)))
						    == NULL) {
							ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
						}
						SIN(allowIP.addr.NetAddr)->sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN    
                                                SIN(allowIP.addr.NetAddr)->sin_len    = sizeof (struct sockaddr_in);
#endif
						SIN(allowIP.addr.NetAddr)->sin_port   = 0;
						memcpy(&(SIN(allowIP.addr.NetAddr)->sin_addr.s_addr),
							&(SIN6(res->ai_addr)->sin6_addr.s6_addr32[3]),
							sizeof (struct sockaddr_in));

						if((iRet = AddAllowedSenderEntry(ppRoot, ppLast, &allowIP,
								iSignificantBits))
							!= RS_RET_OK)
							FINALIZE;
					} else {
						/* finally add IPv6 */
						
						iSignificantBits = 128;
						allowIP.flags = 0;
						if((allowIP.addr.NetAddr = malloc(res->ai_addrlen)) == NULL) {
							ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
						}
						memcpy(allowIP.addr.NetAddr, res->ai_addr, res->ai_addrlen);
						
						if((iRet = AddAllowedSenderEntry(ppRoot, ppLast, &allowIP,
								iSignificantBits))
							!= RS_RET_OK)
							FINALIZE;
					}
					break;
				}
			}
			freeaddrinfo (restmp);
		} else {
			/* wildcards in hostname - we need to add a text-based ACL.
			 * For this, we already have everything ready and just need
			 * to pass it along...
			 */
			iRet =  AddAllowedSenderEntry(ppRoot, ppLast, iAllow, iSignificantBits);
		}
	}

finalize_it:
	RETiRet;
}


/* Print an allowed sender list. The caller must tell us which one.
 * iListToPrint = 1 means UDP, 2 means TCP
 * rgerhards, 2005-09-27
 */
void PrintAllowedSenders(int iListToPrint)
{
	struct AllowedSenders *pSender;
	uchar szIP[64];
	
	assert((iListToPrint == 1) || (iListToPrint == 2)
#ifdef USE_GSSAPI
	       || (iListToPrint == 3)
#endif
	       );

	dbgprintf("Allowed %s Senders:\n",
	       (iListToPrint == 1) ? "UDP" :
#ifdef USE_GSSAPI
	       (iListToPrint == 3) ? "GSS" :
#endif
	       "TCP");

	pSender = (iListToPrint == 1) ? pAllowedSenders_UDP :
#ifdef USE_GSSAPI
		(iListToPrint == 3) ? pAllowedSenders_GSS :
#endif
		pAllowedSenders_TCP;
	if(pSender == NULL) {
		dbgprintf("\tNo restrictions set.\n");
	} else {
		while(pSender != NULL) {
			if (F_ISSET(pSender->allowedSender.flags, ADDR_NAME))
				dbgprintf ("\t%s\n", pSender->allowedSender.addr.HostWildcard);
			else {
				if(mygetnameinfo (pSender->allowedSender.addr.NetAddr,
						     SALEN(pSender->allowedSender.addr.NetAddr),
						     (char*)szIP, 64, NULL, 0, NI_NUMERICHOST) == 0) {
					dbgprintf ("\t%s/%u\n", szIP, pSender->SignificantBits);
				} else {
					/* getnameinfo() failed - but as this is only a
					 * debug function, we simply spit out an error and do
					 * not care much about it.
					 */
					dbgprintf("\tERROR in getnameinfo() - something may be wrong "
						"- ignored for now\n");
				}
			}
			pSender = pSender->pNext;
		}
	}
}


/* parse an allowed sender config line and add the allowed senders
 * (if the line is correct).
 * rgerhards, 2005-09-27
 */
rsRetVal addAllowedSenderLine(char* pName, uchar** ppRestOfConfLine)
{
	struct AllowedSenders **ppRoot;
	struct AllowedSenders **ppLast;
	rsParsObj *pPars;
	rsRetVal iRet;
	struct NetAddr *uIP = NULL;
	int iBits;

	assert(pName != NULL);
	assert(ppRestOfConfLine != NULL);
	assert(*ppRestOfConfLine != NULL);

	if(!strcasecmp(pName, "udp")) {
		ppRoot = &pAllowedSenders_UDP;
		ppLast = &pLastAllowedSenders_UDP;
	} else if(!strcasecmp(pName, "tcp")) {
		ppRoot = &pAllowedSenders_TCP;
		ppLast = &pLastAllowedSenders_TCP;
#ifdef USE_GSSAPI
	} else if(!strcasecmp(pName, "gss")) {
		ppRoot = &pAllowedSenders_GSS;
		ppLast = &pLastAllowedSenders_GSS;
#endif
	} else {
		errmsg.LogError(0, RS_RET_ERR, "Invalid protocol '%s' in allowed sender "
		           "list, line ignored", pName);
		return RS_RET_ERR;
	}

	/* OK, we now know the protocol and have valid list pointers.
	 * So let's process the entries. We are using the parse class
	 * for this.
	 */
	/* create parser object starting with line string without leading colon */
	if((iRet = rsParsConstructFromSz(&pPars, (uchar*) *ppRestOfConfLine) != RS_RET_OK)) {
		errmsg.LogError(0, iRet, "Error %d constructing parser object - ignoring allowed sender list", iRet);
		return(iRet);
	}

	while(!parsIsAtEndOfParseString(pPars)) {
		if(parsPeekAtCharAtParsPtr(pPars) == '#')
			break; /* a comment-sign stops processing of line */
		/* now parse a single IP address */
		if((iRet = parsAddrWithBits(pPars, &uIP, &iBits)) != RS_RET_OK) {
			errmsg.LogError(0, iRet, "Error %d parsing address in allowed sender"
				    "list - ignoring.", iRet);
			rsParsDestruct(pPars);
			return(iRet);
		}
		if((iRet = AddAllowedSender(ppRoot, ppLast, uIP, iBits)) != RS_RET_OK) {
		        if(iRet == RS_RET_NOENTRY) {
			        errmsg.LogError(0, iRet, "Error %d adding allowed sender entry "
					    "- ignoring.", iRet);
		        } else {
			        errmsg.LogError(0, iRet, "Error %d adding allowed sender entry "
					    "- terminating, nothing more will be added.", iRet);
				rsParsDestruct(pPars);
				return(iRet);
		        }
		}
		free (uIP); /* copy stored in AllowedSenders list */ 
	}

	/* cleanup */
	*ppRestOfConfLine += parsGetCurrentPosition(pPars);
	return rsParsDestruct(pPars);
}



/* compares a host to an allowed sender list entry. Handles all subleties
 * including IPv4/v6 as well as domain name wildcards.
 * This is a helper to isAllowedSender. As it is only called once, it is
 * declared inline.
 * Returns 0 if they do not match, something else otherwise.
 * contributed 1007-07-16 by mildew@gmail.com
 */
static inline int MaskCmp(struct NetAddr *pAllow, uint8_t bits, struct sockaddr *pFrom, const char *pszFromHost)
{
	assert(pAllow != NULL);
	assert(pFrom != NULL);

	if(F_ISSET(pAllow->flags, ADDR_NAME)) {
		dbgprintf("MaskCmp: host=\"%s\"; pattern=\"%s\"\n", pszFromHost, pAllow->addr.HostWildcard);
		
#		if !defined(FNM_CASEFOLD)
			/* TODO: I don't know if that then works, seen on HP UX, what I have not in lab... ;) */
			return(fnmatch(pAllow->addr.HostWildcard, pszFromHost, FNM_NOESCAPE) == 0);
#		else
			return(fnmatch(pAllow->addr.HostWildcard, pszFromHost, FNM_NOESCAPE|FNM_CASEFOLD) == 0);
#		endif
	} else {/* We need to compare an IP address */
		switch (pFrom->sa_family) {
		case AF_INET:
			if (AF_INET == pAllow->addr.NetAddr->sa_family)
				return(( SIN(pFrom)->sin_addr.s_addr & htonl(0xffffffff << (32 - bits)) )
				       == SIN(pAllow->addr.NetAddr)->sin_addr.s_addr);
			else
				return 0;
			break;
		case AF_INET6:
			switch (pAllow->addr.NetAddr->sa_family) {
			case AF_INET6: {
				struct in6_addr ip, net;
				register uint8_t i;
				
				memcpy (&ip,  &(SIN6(pFrom))->sin6_addr, sizeof (struct in6_addr));
				memcpy (&net, &(SIN6(pAllow->addr.NetAddr))->sin6_addr, sizeof (struct in6_addr));
				
				i = bits/32;
				if (bits % 32)
					ip.s6_addr32[i++] &= htonl(0xffffffff << (32 - (bits % 32)));
				for (; i < (sizeof ip.s6_addr32)/4; i++)
					ip.s6_addr32[i] = 0;
				
				return (memcmp (ip.s6_addr, net.s6_addr, sizeof ip.s6_addr) == 0 &&
					(SIN6(pAllow->addr.NetAddr)->sin6_scope_id != 0 ?
					 SIN6(pFrom)->sin6_scope_id == SIN6(pAllow->addr.NetAddr)->sin6_scope_id : 1));
			}
			case AF_INET: {
				struct in6_addr *ip6 = &(SIN6(pFrom))->sin6_addr;
				struct in_addr  *net = &(SIN(pAllow->addr.NetAddr))->sin_addr;
				
				if ((ip6->s6_addr32[3] & (u_int32_t) htonl((0xffffffff << (32 - bits)))) == net->s_addr &&
#if BYTE_ORDER == LITTLE_ENDIAN
				    (ip6->s6_addr32[2] == (u_int32_t)0xffff0000) &&
#else
				    (ip6->s6_addr32[2] == (u_int32_t)0x0000ffff) &&
#endif
				    (ip6->s6_addr32[1] == 0) && (ip6->s6_addr32[0] == 0))
					return 1;
				else
					return 0;
			}
			default:
				/* Unsupported AF */
				return 0;
			}
		default:
			/* Unsupported AF */
			return 0;
		}
	}
}


/* check if a sender is allowed. The root of the the allowed sender.
 * list must be proveded by the caller. As such, this function can be
 * used to check both UDP and TCP allowed sender lists.
 * returns 1, if the sender is allowed, 0 otherwise.
 * rgerhards, 2005-09-26
 */
static int isAllowedSender(uchar *pszType, struct sockaddr *pFrom, const char *pszFromHost)
{
	struct AllowedSenders *pAllow;
	struct AllowedSenders *pAllowRoot;

	assert(pFrom != NULL);
	
	if(setAllowRoot(&pAllowRoot, pszType) != RS_RET_OK)
		return 0;	/* if something went wrong, we denie access - that's the better choice... */

	if(pAllowRoot == NULL)
		return 1; /* checking disabled, everything is valid! */
	
	/* now we loop through the list of allowed senders. As soon as
	 * we find a match, we return back (indicating allowed). We loop
	 * until we are out of allowed senders. If so, we fall through the
	 * loop and the function's terminal return statement will indicate
	 * that the sender is disallowed.
	 */
	for(pAllow = pAllowRoot ; pAllow != NULL ; pAllow = pAllow->pNext) {
		if (MaskCmp (&(pAllow->allowedSender), pAllow->SignificantBits, pFrom, pszFromHost))
			return 1;
	}
	return 0;
}


/* The following #ifdef sequence is a small compatibility 
 * layer. It tries to work around the different availality
 * levels of SO_BSDCOMPAT on linuxes...
 * I borrowed this code from
 *    http://www.erlang.org/ml-archive/erlang-questions/200307/msg00037.html
 * It still needs to be a bit better adapted to rsyslog.
 * rgerhards 2005-09-19
 */
#include <sys/utsname.h>
static int
should_use_so_bsdcompat(void)
{
#ifndef OS_BSD
    static int init_done;
    static int so_bsdcompat_is_obsolete;

    if (!init_done) {
	struct utsname myutsname;
	unsigned int version, patchlevel;

	init_done = 1;
	if (uname(&myutsname) < 0) {
		char errStr[1024];
		dbgprintf("uname: %s\r\n", rs_strerror_r(errno, errStr, sizeof(errStr)));
		return 1;
	}
	/* Format is <version>.<patchlevel>.<sublevel><extraversion>
	   where the first three are unsigned integers and the last
	   is an arbitrary string. We only care about the first two. */
	if (sscanf(myutsname.release, "%u.%u", &version, &patchlevel) != 2) {
	    dbgprintf("uname: unexpected release '%s'\r\n",
		    myutsname.release);
	    return 1;
	}
	/* SO_BSCOMPAT is deprecated and triggers warnings in 2.5
	   kernels. It is a no-op in 2.4 but not in 2.2 kernels. */
	if (version > 2 || (version == 2 && patchlevel >= 5))
	    so_bsdcompat_is_obsolete = 1;
    }
    return !so_bsdcompat_is_obsolete;
#else	/* #ifndef OS_BSD */
    return 1;
#endif	/* #ifndef OS_BSD */
}
#ifndef SO_BSDCOMPAT
/* this shall prevent compiler errors due to undfined name */
#define SO_BSDCOMPAT 0
#endif

/* get the hostname of the message source. This was originally in cvthname()
 * but has been moved out of it because of clarity and fuctional separation.
 * It must be provided by the socket we received the message on as well as
 * a NI_MAXHOST size large character buffer for the FQDN.
 * 2008-05-16 rgerhards: added field for IP address representation. Must also
 * be NI_MAXHOST size large.
 *
 * Please see http://www.hmug.org/man/3/getnameinfo.php (under Caveats)
 * for some explanation of the code found below. We do by default not
 * discard message where we detected malicouos DNS PTR records. However,
 * there is a user-configurabel option that will tell us if
 * we should abort. For this, the return value tells the caller if the
 * message should be processed (1) or discarded (0).
 */
static rsRetVal
gethname(struct sockaddr_storage *f, uchar *pszHostFQDN, uchar *ip)
{
	DEFiRet;
	int error;
	sigset_t omask, nmask;
	struct addrinfo hints, *res;
	
	assert(f != NULL);
	assert(pszHostFQDN != NULL);

        error = mygetnameinfo((struct sockaddr *)f, SALEN((struct sockaddr *)f),
			    (char*) ip, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);

        if (error) {
                dbgprintf("Malformed from address %s\n", gai_strerror(error));
		strcpy((char*) pszHostFQDN, "???");
		strcpy((char*) ip, "???");
		ABORT_FINALIZE(RS_RET_INVALID_SOURCE);
	}

	if(!glbl.GetDisableDNS()) {
		sigemptyset(&nmask);
		sigaddset(&nmask, SIGHUP);
		pthread_sigmask(SIG_BLOCK, &nmask, &omask);

		error = mygetnameinfo((struct sockaddr *)f, SALEN((struct sockaddr *) f),
				    (char*)pszHostFQDN, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
		
		if (error == 0) {
			memset (&hints, 0, sizeof (struct addrinfo));
			hints.ai_flags = AI_NUMERICHOST;

			/* we now do a lookup once again. This one should fail,
			 * because we should not have obtained a non-numeric address. If
			 * we got a numeric one, someone messed with DNS!
			 */
			if (getaddrinfo ((char*)pszHostFQDN, NULL, &hints, &res) == 0) {
				uchar szErrMsg[1024];
				freeaddrinfo (res);
				/* OK, we know we have evil. The question now is what to do about
				 * it. One the one hand, the message might probably be intended
				 * to harm us. On the other hand, losing the message may also harm us.
				 * Thus, the behaviour is controlled by the $DropMsgsWithMaliciousDnsPTRRecords
				 * option. If it tells us we should discard, we do so, else we proceed,
				 * but log an error message together with it.
				 * time being, we simply drop the name we obtained and use the IP - that one
				 * is OK in any way. We do also log the error message. rgerhards, 2007-07-16
		 		 */
		 		if(glbl.GetDropMalPTRMsgs() == 1) {
					snprintf((char*)szErrMsg, sizeof(szErrMsg) / sizeof(uchar),
						 "Malicious PTR record, message dropped "
						 "IP = \"%s\" HOST = \"%s\"",
						 ip, pszHostFQDN);
					errmsg.LogError(0, RS_RET_MALICIOUS_ENTITY, "%s", szErrMsg);
					pthread_sigmask(SIG_SETMASK, &omask, NULL);
					ABORT_FINALIZE(RS_RET_MALICIOUS_ENTITY);
				}

				/* Please note: we deal with a malicous entry. Thus, we have crafted
				 * the snprintf() below so that all text is in front of the entry - maybe
				 * it contains characters that make the message unreadable
				 * (OK, I admit this is more or less impossible, but I am paranoid...)
				 * rgerhards, 2007-07-16
				 */
				snprintf((char*)szErrMsg, sizeof(szErrMsg) / sizeof(uchar),
					 "Malicious PTR record (message accepted, but used IP "
					 "instead of PTR name: IP = \"%s\" HOST = \"%s\"",
					 ip, pszHostFQDN);
				errmsg.LogError(0, NO_ERRCODE, "%s", szErrMsg);

				error = 1; /* that will trigger using IP address below. */
			}
		}		
		pthread_sigmask(SIG_SETMASK, &omask, NULL);
	}

        if(error || glbl.GetDisableDNS()) {
                dbgprintf("Host name for your address (%s) unknown\n", ip);
		strcpy((char*) pszHostFQDN, (char*)ip);
		ABORT_FINALIZE(RS_RET_ADDRESS_UNKNOWN);
        }

finalize_it:
	RETiRet;
}



/* print out which socket we are listening on. This is only
 * a debug aid. rgerhards, 2007-07-02
 */
void debugListenInfo(int fd, char *type)
{
	char *szFamily;
	int port;
	struct sockaddr sa;
	struct sockaddr_in *ipv4;
	struct sockaddr_in6 *ipv6;
	socklen_t saLen = sizeof(sa);

	if(getsockname(fd, &sa, &saLen) == 0) {
		switch(sa.sa_family) {
		case PF_INET:
			szFamily = "IPv4";
			ipv4 = (struct sockaddr_in*) &sa;
			port = ntohs(ipv4->sin_port);
			break;
		case PF_INET6:
			szFamily = "IPv6";
			ipv6 = (struct sockaddr_in6*) &sa;
			port = ntohs(ipv6->sin6_port);
			break;
		default:
			szFamily = "other";
			port = -1;
			break;
		}
		dbgprintf("Listening on %s syslogd socket %d (%s/port %d).\n",
			type, fd, szFamily, port);
		return;
	}

	/* we can not obtain peer info. We are just providing
	 * debug info, so this is no reason to break the program
	 * or do any serious error reporting.
	 */
	dbgprintf("Listening on syslogd socket %d - could not obtain peer info.\n", fd);
}


/* Return a printable representation of a host address.
 * Now (2007-07-16) also returns the full host name (if it could be obtained)
 * in the second param [thanks to mildew@gmail.com for the patch].
 * The caller must provide buffer space for pszHost and pszHostFQDN. These
 * buffers must be of size NI_MAXHOST. This is not checked here, because
 * there is no way to check it. We use this way of doing things because it
 * frees us from using dynamic memory allocation where it really does not
 * pay.
 * 2005-05-16 rgerhards: added IP representation. Must also be NI_MAXHOST
 */
rsRetVal cvthname(struct sockaddr_storage *f, uchar *pszHost, uchar *pszHostFQDN, uchar *pszIP)
{
	DEFiRet;
	register uchar *p;
	int count;
	
	assert(f != NULL);
	assert(pszHost != NULL);
	assert(pszHostFQDN != NULL);

	iRet = gethname(f, pszHostFQDN, pszIP);

	if(iRet == RS_RET_INVALID_SOURCE || iRet == RS_RET_ADDRESS_UNKNOWN) {
		strcpy((char*) pszHost, (char*) pszHostFQDN); /* we use whatever was provided as replacement */
		ABORT_FINALIZE(RS_RET_OK); /* this is handled, we are happy with it */
	} else if(iRet != RS_RET_OK) {
		FINALIZE; /* we return whatever error state we have - can not handle it */
	}

	/* if we reach this point, we obtained a non-numeric hostname and can now process it */

	/* Convert to lower case */
	for(p = pszHostFQDN ; *p ; p++)
		if (isupper((int) *p))
			*p = tolower(*p);
	
	/* OK, the fqdn is now known. Now it is time to extract only the hostname
	 * part if we were instructed to do so.
	 */
	/* TODO: quick and dirty right now: we need to optimize that. We simply
	 * copy over the buffer and then use the old code. In the long term, that should
	 * be placed in its own function and probably outside of the net module (at least
	 * if should no longer reley on syslogd.c's global config-setting variables).
	 * Note that the old code always removes the local domain. We may want to
	 * make this in option in the long term. (rgerhards, 2007-09-11)
	 */
	strcpy((char*)pszHost, (char*)pszHostFQDN);
	if(   (glbl.GetPreserveFQDN() == 0)
	   && (p = (uchar*) strchr((char*)pszHost, '.'))) { /* find start of domain name "machine.example.com" */
		strcmp((char*)(p + 1), (char*)glbl.GetLocalDomain());
		if(strcmp((char*)(p + 1), (char*)glbl.GetLocalDomain()) == 0) {
			*p = '\0'; /* simply terminate the string */
		} else {
			/* now check if we belong to any of the domain names that were specified
			 * in the -s command line option. If so, remove and we are done.
			 * TODO: this must go away! -- rgerhards, 2008-04-16
			 * For proper modularization, this must be done different, e.g. via a
			 * "to be stripped" property of *this* object itself.
			 */
			if(glbl.GetStripDomains() != NULL) {
				count=0;
				while(glbl.GetStripDomains()[count]) {
					if (strcmp((char*)(p + 1), glbl.GetStripDomains()[count]) == 0) {
						*p = '\0';
						FINALIZE; /* we are done */
					}
					count++;
				}
			}
			/* if we reach this point, we have not found any domain we should strip. Now
			 * we try and see if the host itself is listed in the -l command line option
			 * and so should be stripped also. If so, we do it and return. Please note that
			 * -l list FQDNs, not just the hostname part. If it did just list the hostname, the
			 * door would be wide-open for all kinds of mixing up of hosts. Because of this,
			 * you'll see comparison against the full string (pszHost) below. The termination
			 * still occurs at *p, which points at the first dot after the hostname.
			 * TODO: this must also go away - see comment above -- rgerhards, 2008-04-16
			 */
			if(glbl.GetLocalHosts() != NULL) {
				count=0;
				while (glbl.GetLocalHosts()[count]) {
					if (!strcmp((char*)pszHost, (char*)glbl.GetLocalHosts()[count])) {
						*p = '\0';
						break; /* we are done */
					}
					count++;
				}
			}
		}
	}

finalize_it:
	RETiRet;
}


/* get the name of the local host. A pointer to a character pointer is passed
 * in, which on exit points to the local hostname. This buffer is dynamically
 * allocated and must be free()ed by the caller. If the functions returns an
 * error, the pointer is NULL. This function is based on GNU/Hurd's localhostname
 * function.
 * rgerhards, 20080-04-10
 */
static rsRetVal
getLocalHostname(uchar **ppName)
{
	DEFiRet;
	uchar *buf = NULL;
	size_t buf_len = 0;

	assert(ppName != NULL);

	do {
		if(buf == NULL) {
			buf_len = 128;        /* Initial guess */
			CHKmalloc(buf = malloc(buf_len));
		} else {
			buf_len += buf_len;
			CHKmalloc(buf = realloc (buf, buf_len));
		}
	} while((gethostname((char*)buf, buf_len) == 0 && !memchr (buf, '\0', buf_len)) || errno == ENAMETOOLONG);

	*ppName = buf;
	buf = NULL;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(buf != NULL)
			free(buf);
	}
	RETiRet;
}


/* closes the UDP listen sockets (if they exist) and frees
 * all dynamically assigned memory. 
 */
void closeUDPListenSockets(int *pSockArr)
{
	register int i;

	assert(pSockArr != NULL);
        if(pSockArr != NULL) {
	        for (i = 0; i < *pSockArr; i++)
	                close(pSockArr[i+1]);
		free(pSockArr);
	}
}


/* creates the UDP listen sockets
 * hostname and/or pszPort may be NULL, but not both!
 * bIsServer indicates if a server socket should be created
 * 1 - server, 0 - client
 */
int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer)
{
        struct addrinfo hints, *res, *r;
        int error, maxs, *s, *socks, on = 1;
	int sockflags;

	assert(!((pszPort == NULL) && (hostname == NULL)));
        memset(&hints, 0, sizeof(hints));
	if(bIsServer)
		hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
	else
		hints.ai_flags = AI_NUMERICSERV;
        hints.ai_family = glbl.GetDefPFFamily();
        hints.ai_socktype = SOCK_DGRAM;
        error = getaddrinfo((char*) hostname, (char*) pszPort, &hints, &res);
        if(error) {
               errmsg.LogError(0, NO_ERRCODE, "%s",  gai_strerror(error));
	       errmsg.LogError(0, NO_ERRCODE, "UDP message reception disabled due to error logged in last message.\n");
	       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(0, NO_ERRCODE, "couldn't allocate memory for UDP sockets, suspending UDP 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(errno, NO_ERRCODE, "create_udp_socket(), socket");
				/* it is debateble 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(errno, NO_ERRCODE, "setsockopt");
			close(*s);
			*s = -1;
			continue;
                	}
                }
#		endif

		/* if we have an error, we "just" suspend that socket. Eventually
		 * other sockets will work. At the end of this function, we check
		 * if we managed to open at least one socket. If not, we'll write
		 * a "inet suspended" message and declare failure. Else we use
		 * what we could obtain.
		 * rgerhards, 2007-06-22
		 */
       		if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
			       (char *) &on, sizeof(on)) < 0 ) {
			errmsg.LogError(errno, NO_ERRCODE, "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.
		 */
#if !defined(OS_BSD) && !defined(__hpux)
		if (should_use_so_bsdcompat()) {
			if (setsockopt(*s, SOL_SOCKET, SO_BSDCOMPAT,
					(char *) &on, sizeof(on)) < 0) {
				errmsg.LogError(errno, NO_ERRCODE, "setsockopt(BSDCOMPAT)");
                                close(*s);
				*s = -1;
				continue;
			}
		}
#endif
		/* We must not block on the network socket, in case a packet
		 * gets lost between select and recv, otherwise the process
		 * will stall until the timeout, and other processes trying to
		 * log will also stall.
		 * Patch vom Colin Phipps <cph@cph.demon.co.uk> to the original
		 * sysklogd source. Applied to rsyslogd on 2005-10-19.
		 */
		if ((sockflags = fcntl(*s, F_GETFL)) != -1) {
			sockflags |= O_NONBLOCK;
			/* SETFL could fail too, so get it caught by the subsequent
			 * error check.
			 */
			sockflags = fcntl(*s, F_SETFL, sockflags);
		}
		if (sockflags == -1) {
			errmsg.LogError(errno, NO_ERRCODE, "fcntl(O_NONBLOCK)");
                        close(*s);
			*s = -1;
			continue;
		}

		if(bIsServer) {
			/* rgerhards, 2007-06-22: if we run on a kernel that does not support
			 * the IPV6_V6ONLY socket option, we need to use a work-around. On such
			 * systems the IPv6 socket does also accept IPv4 sockets. So an IPv4
			 * socket can not listen on the same port as an IPv6 socket. The only
			 * workaround is to ignore the "socket in use" error. This is what we
			 * do if we have to.
			 */
			if(     (bind(*s, r->ai_addr, r->ai_addrlen) < 0)
	#		ifndef IPV6_V6ONLY
			     && (errno != EADDRINUSE)
	#		endif
			   ) {
				errmsg.LogError(errno, NO_ERRCODE, "bind");
				close(*s);
				*s = -1;
				continue;
			}
		}

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

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

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

        if(*socks == 0) {
		errmsg.LogError(0, NO_ERRCODE, "No UDP listen socket could successfully be initialized, "
			 "message reception via UDP disabled.\n");
		/* we do NOT need to free any sockets, because there were none... */
        	free(socks);
		return(NULL);
	}

	return(socks);
}


/* check if two provided socket addresses point to the same host. Note that the
 * length of the sockets must be provided as third parameter. This is necessary to
 * compare non IPv4/v6 hosts, in which case we do a simple memory compare of the
 * address structure (in that case, the same host may not reliably be detected).
 * Note that we need to do the comparison not on the full structure, because it contains things
 * like the port, which we do not need to look at when thinking about hostnames. So we look
 * at the relevant fields, what means a somewhat more complicated processing.
 * Also note that we use a non-standard calling interface, as this is much more natural and
 * it looks extremely unlikely that we get an exception of any kind here. What we
 * return is mimiced after memcmp(), and as such useful for building binary trees 
 * (the order relation may be a bit arbritrary, but at least it is consistent).
 * rgerhards, 2009-09-03
 */
static int CmpHost(struct sockaddr_storage *s1, struct sockaddr_storage* s2, size_t socklen)
{
	int ret;

	if(((struct sockaddr*) s1)->sa_family != ((struct sockaddr*) s2)->sa_family) {
		ret = memcmp(s1, s2, socklen);
		goto finalize_it;
	}

	if(((struct sockaddr*) s1)->sa_family == AF_INET) {
		if(((struct sockaddr_in *) s1)->sin_addr.s_addr == ((struct sockaddr_in*)s2)->sin_addr.s_addr) {
			ret = 0;
		} else if(((struct sockaddr_in *) s1)->sin_addr.s_addr < ((struct sockaddr_in*)s2)->sin_addr.s_addr) {
			ret = -1;
		} else {
			ret = 1;
		}
	} else if(((struct sockaddr*) s1)->sa_family == AF_INET6) {
		/* IPv6 addresses are always 16 octets long */
		ret = memcmp(((struct sockaddr_in6 *)s1)->sin6_addr.s6_addr, ((struct sockaddr_in6*)s2)->sin6_addr.s6_addr, 16);
	} else {
		ret = memcmp(s1, s2, socklen);
	}

dbgprintf("CmpHost returns %d\n", ret);
finalize_it:
	return ret;
}


/* queryInterface function
 * rgerhards, 2008-03-05
 */
BEGINobjQueryInterface(net)
CODESTARTobjQueryInterface(net)
	if(pIf->ifVersion != netCURR_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->cvthname = cvthname;
	/* things to go away after proper modularization */
	pIf->addAllowedSenderLine = addAllowedSenderLine;
	pIf->PrintAllowedSenders = PrintAllowedSenders;
	pIf->clearAllowedSenders = clearAllowedSenders;
	pIf->debugListenInfo = debugListenInfo;
	pIf->create_udp_socket = create_udp_socket;
	pIf->closeUDPListenSockets = closeUDPListenSockets;
	pIf->isAllowedSender = isAllowedSender;
	pIf->should_use_so_bsdcompat = should_use_so_bsdcompat;
	pIf->getLocalHostname = getLocalHostname;
	pIf->AddPermittedPeer = AddPermittedPeer;
	pIf->DestructPermittedPeers = DestructPermittedPeers;
	pIf->PermittedPeerWildcardMatch = PermittedPeerWildcardMatch;
	pIf->CmpHost = CmpHost;
finalize_it:
ENDobjQueryInterface(net)


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


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

	/* set our own handlers */
ENDObjClassInit(net)


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


BEGINmodExit
CODESTARTmodExit
	netClassExit();
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(netClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
ENDmodInit
/* vi:set ai:
 */