aboutsummaryrefslogtreecommitdiffstats
path: root/wiretap/netxray.c
blob: f5164a06157391b6526f3668a6a7c2f40867b4ab (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
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
/* netxray.c
 *
 * $Id$
 *
 * Wiretap Library
 * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "netxray.h"
#include "buffer.h"
#include "atm.h"

/* Capture file header, *including* magic number, is padded to 128 bytes. */
#define	CAPTUREFILE_HEADER_SIZE	128

/* Magic number in NetXRay 1.x files. */
static const char old_netxray_magic[] = {
	'V', 'L', '\0', '\0'
};

/* Magic number in NetXRay 2.0 and later, and Windows Sniffer, files. */
static const char netxray_magic[] = {	/* magic header */
	'X', 'C', 'P', '\0'
};

/* NetXRay file header (minus magic number). */
struct netxray_hdr {
	char	version[8];	/* version number */
	guint32	start_time;	/* UNIX time when capture started */
	guint32	nframes;	/* number of packets */
	guint32	xxx;		/* unknown */
	guint32	start_offset;	/* offset of first packet in capture */
	guint32	end_offset;	/* offset after last packet in capture */
	guint32 xxy[3];		/* unknown */
	guint8	network;	/* datalink type */
	guint8	xxz[3];		/* XXX - is this the upper 3 bytes of the datalink type? */
	guint8	timeunit;	/* encodes length of a tick */
	guint8	xxa[3];		/* XXX - is this the upper 3 bytes of the time units? */
	guint32	timelo;		/* lower 32 bits of time stamp of capture start */
	guint32	timehi;		/* upper 32 bits of time stamp of capture start */
	guint32 linespeed;	/* speed of network, in bits/second */
	guint8	xxb[12];	/* other stuff */
	guint8	realtick[4];	/* in version 2, units of the timestamps  */
	guint8	xxc[48];	/* other unknown stuff */
};

/*
 * Capture type, in xxc[4].
 *
 * XXX - S6040-model Sniffers with gigabit blades store 6 here for
 * Etherneet captures, and some other Ethernet captures had a capture
 * type of 3, so presumably the interpretation of the capture type
 * depends on the network type.  We prefix all the capture types
 * for WAN captures with WAN_.
 */
#define CAPTYPE_NDIS	0	/* Capture on network interface using NDIS */

/*
 * Ethernet capture types.
 */
#define ETH_CAPTYPE_GIGPOD	2	/* gigabit Ethernet captured with pod */
#define ETH_CAPTYPE_OTHERPOD	3	/* non-gigabit Ethernet captured with pod */
#define ETH_CAPTYPE_GIGPOD2	6	/* gigabit Ethernet captured with pod */

/*
 * WAN capture types.
 */
#define WAN_CAPTYPE_BROUTER	1	/* Bridge/router captured with pod */
#define WAN_CAPTYPE_PPP		3	/* PPP captured with pod */
#define WAN_CAPTYPE_FRELAY	4	/* Frame Relay captured with pod */
#define WAN_CAPTYPE_BROUTER2	5	/* Bridge/router captured with pod */
#define WAN_CAPTYPE_HDLC	6	/* HDLC (X.25, ISDN) captured with pod */
#define WAN_CAPTYPE_SDLC	7	/* SDLC captured with pod */
#define WAN_CAPTYPE_HDLC2	8	/* HDLC captured with pod */
#define WAN_CAPTYPE_BROUTER3	9	/* Bridge/router captured with pod */
#define WAN_CAPTYPE_SMDS	10	/* SMDS DXI */
#define WAN_CAPTYPE_BROUTER4	11	/* Bridge/router captured with pod */
#define WAN_CAPTYPE_BROUTER5	12	/* Bridge/router captured with pod */

#define CAPTYPE_ATM		15	/* ATM captured with pod */

/*
 * # of ticks that equal 1 second, in version 002.xxx files other
 * than Ethernet captures with a captype other than CAPTYPE_NDIS;
 * the index into this array is hdr.timeunit.
 *
 * DO NOT SEND IN PATCHES THAT CHANGE ANY OF THE NON-ZERO VALUES IN
 * ANY OF THE TpS TABLES.  THOSE VALUES ARE CORRECT FOR AT LEAST ONE
 * CAPTURE, SO CHANGING THEM WILL BREAK AT LEAST SOME CAPTURES.  WE
 * WILL NOT CHECK IN PATCHES THAT CHANGE THESE VALUES.
 *
 * Instead, if a value in TpS is wrong, check whether captype has a
 * non-zero value; if so, perhaps we need a new TpS table for the
 * corresponding network type and captype.
 *
 * Note that the "realtick" value is wrong in many captures, so
 * we no longer use it.  We don't know what significance it has.
 *
 * XXX - the third item is 1193180.0, presumably because somebody found
 * it gave the right answer for some captures, but 3 times that, i.e.
 * 3579540.0, appears to give the right answer for some other captures.
 * Some captures have realtick of 1193182, some have 3579545, and some
 * have 1193000.  Most of those, in one set of captures somebody has,
 * are wrong.
 *
 * XXX - in at least one ATM capture, hdr.realtick is 1193180.0
 * and hdr.timeunit is 0.  Does that capture have a captype of
 * CAPTYPE_ATM?  If so, what should the table for ATM captures with
 * that captype be?
 */
static double TpS[] = { 1e6, 1193000.0, 1193182.0 };
#define NUM_NETXRAY_TIMEUNITS (sizeof TpS / sizeof TpS[0])

/*
 * Table of time units for Ethernet captures with captype ETH_CAPTYPE_GIGPOD.
 * 0.0 means "unknown.
 *
 * It appears that, at least for Ethernet captures, if captype is
 * ETH_CAPTYPE_GIGPOD, that indicates that it's a gigabit Ethernet
 * capture, possibly from a special whizzo gigabit pod, and also
 * indicates that the time stamps have some higher resolution than
 * in other captures, possibly thanks to a high-resolution timer
 * on the pod.
 *
 * It also appears that the time units might differ for gigabit pod
 * captures between version 002.001 and 002.002.  For 002.001,
 * the values below are correct; for 002.002, it's claimed that
 * the right value for TpS_gigpod[2] is 1250000.0, but at least one
 * 002.002 gigabit pod capture has 31250000.0 as the right value.
 */
static double TpS_gigpod[] = { 1e9, 0.0, 31250000.0 };
#define NUM_NETXRAY_TIMEUNITS_GIGPOD (sizeof TpS_gigpod / sizeof TpS_gigpod[0])

/*
 * Table of time units for Ethernet captures with captype ETH_CAPTYPE_OTHERPOD.
 */
static double TpS_otherpod[] = { 1e6, 0.0, 1250000.0 }; 
#define NUM_NETXRAY_TIMEUNITS_OTHERPOD (sizeof TpS_otherpod / sizeof TpS_otherpod[0])

/*
 * Table of time units for Ethernet captures with captype ETH_CAPTYPE_GIGPOD2. 
 */
static double TpS_gigpod2[] = { 1e9, 0.0, 0.0 };
#define NUM_NETXRAY_TIMEUNITS_GIGPOD2 (sizeof TpS_gigpod2 / sizeof TpS_gigpod2[0])

/* Version number strings. */
static const char vers_1_0[] = {
	'0', '0', '1', '.', '0', '0', '0', '\0'
};

static const char vers_1_1[] = {
	'0', '0', '1', '.', '1', '0', '0', '\0'
};

static const char vers_2_000[] = {
	'0', '0', '2', '.', '0', '0', '0', '\0'
};

static const char vers_2_001[] = {
	'0', '0', '2', '.', '0', '0', '1', '\0'
};

static const char vers_2_002[] = {
	'0', '0', '2', '.', '0', '0', '2', '\0'
};

static const char vers_2_003[] = {
	'0', '0', '2', '.', '0', '0', '3', '\0'
};

/* Old NetXRay data record format - followed by frame data. */
struct old_netxrayrec_hdr {
	guint32	timelo;		/* lower 32 bits of time stamp */
	guint32	timehi;		/* upper 32 bits of time stamp */
	guint16	len;		/* packet length */
	guint8	xxx[6];		/* unknown */
};

/* NetXRay format version 1.x data record format - followed by frame data. */
struct netxrayrec_1_x_hdr {
	guint32	timelo;		/* lower 32 bits of time stamp */
	guint32	timehi;		/* upper 32 bits of time stamp */
	guint16	orig_len;	/* packet length */
	guint16	incl_len;	/* capture length */
	guint8	xxx[16];	/* unknown */
};

/* NetXRay format version 2.x data record format - followed by frame data. */
struct netxrayrec_2_x_hdr {
	guint32	timelo;		/* lower 32 bits of time stamp */
	guint32	timehi;		/* upper 32 bits of time stamp */
	guint16	orig_len;	/* packet length */
	guint16	incl_len;	/* capture length */
	guint8	xxx[28];	/* various data */
};

/*
 * Union of the data record headers.
 */
union netxrayrec_hdr {
	struct old_netxrayrec_hdr old_hdr;
	struct netxrayrec_1_x_hdr hdr_1_x;
	struct netxrayrec_2_x_hdr hdr_2_x;
};

static gboolean netxray_read(wtap *wth, int *err, gchar **err_info,
    long *data_offset);
static gboolean netxray_seek_read(wtap *wth, long seek_off,
    union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
    int *err, gchar **err_info);
static int netxray_read_rec_header(wtap *wth, FILE_T fh,
    union netxrayrec_hdr *hdr, int *err);
static guint netxray_set_pseudo_header(wtap *wth, const guint8 *pd, int len,
    union wtap_pseudo_header *pseudo_header, union netxrayrec_hdr *hdr);
static gboolean netxray_read_rec_data(FILE_T fh, guint8 *data_ptr,
    guint32 packet_size, int *err);
static void netxray_close(wtap *wth);
static gboolean netxray_dump_1_1(wtap_dumper *wdh,
    const struct wtap_pkthdr *phdr,
    const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
static gboolean netxray_dump_close_1_1(wtap_dumper *wdh, int *err);
static gboolean netxray_dump_2_0(wtap_dumper *wdh,
    const struct wtap_pkthdr *phdr,
    const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
static gboolean netxray_dump_close_2_0(wtap_dumper *wdh, int *err);

int netxray_open(wtap *wth, int *err, gchar **err_info)
{
	int bytes_read;
	char magic[sizeof netxray_magic];
	gboolean is_old;
	struct netxray_hdr hdr;
	guint network_type;
	double timeunit;
	int version_major, version_minor;
	int file_type;
	double start_timestamp;
	static const int netxray_encap[] = {
		WTAP_ENCAP_UNKNOWN,
		WTAP_ENCAP_ETHERNET,
		WTAP_ENCAP_TOKEN_RING,
		WTAP_ENCAP_FDDI_BITSWAPPED,
		/*
		 * XXX - some PPP captures may look like Ethernet,
		 * perhaps because they're using NDIS to capture on the
		 * same machine and it provides simulated-Ethernet
		 * packets, but captures taken with various serial
		 * pods use the same network type value but aren't
		 * shaped like Ethernet.  We handle that below.
		 */
		WTAP_ENCAP_ETHERNET,	/* WAN(PPP), but shaped like Ethernet */
		WTAP_ENCAP_UNKNOWN,	/* LocalTalk */
		WTAP_ENCAP_UNKNOWN,	/* "DIX" - should not occur */
		WTAP_ENCAP_UNKNOWN,	/* ARCNET raw */
		WTAP_ENCAP_UNKNOWN,	/* ARCNET 878.2 */
		WTAP_ENCAP_ATM_PDUS_UNTRUNCATED,	/* ATM */
		WTAP_ENCAP_IEEE_802_11_WITH_RADIO,
					/* Wireless WAN with radio information */
		WTAP_ENCAP_UNKNOWN	/* IrDA */
	};
	#define NUM_NETXRAY_ENCAPS (sizeof netxray_encap / sizeof netxray_encap[0])
	int file_encap;
	guint isdn_type = 0;

	/* Read in the string that should be at the start of a NetXRay
	 * file */
	errno = WTAP_ERR_CANT_READ;
	bytes_read = file_read(magic, 1, sizeof magic, wth->fh);
	if (bytes_read != sizeof magic) {
		*err = file_error(wth->fh);
		if (*err != 0)
			return -1;
		return 0;
	}
	wth->data_offset += sizeof magic;

	if (memcmp(magic, netxray_magic, sizeof magic) == 0) {
		is_old = FALSE;
	} else if (memcmp(magic, old_netxray_magic, sizeof magic) == 0) {
		is_old = TRUE;
	} else {
		return 0;
	}

	/* Read the rest of the header. */
	errno = WTAP_ERR_CANT_READ;
	bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
	if (bytes_read != sizeof hdr) {
		*err = file_error(wth->fh);
		if (*err != 0)
			return -1;
		return 0;
	}
	wth->data_offset += sizeof hdr;

	if (is_old) {
		version_major = 0;
		version_minor = 0;
		file_type = WTAP_FILE_NETXRAY_OLD;
	} else {
		/* It appears that version 1.1 files (as produced by Windows
		 * Sniffer Pro 2.0.01) have the time stamp in microseconds,
		 * rather than the milliseconds version 1.0 files appear to
		 * have.
		 *
		 * It also appears that version 2.00x files have per-packet
		 * headers with some extra fields. */
		if (memcmp(hdr.version, vers_1_0, sizeof vers_1_0) == 0) {
			version_major = 1;
			version_minor = 0;
			file_type = WTAP_FILE_NETXRAY_1_0;
		} else if (memcmp(hdr.version, vers_1_1, sizeof vers_1_1) == 0) {
			version_major = 1;
			version_minor = 1;
			file_type = WTAP_FILE_NETXRAY_1_1;
		} else if (memcmp(hdr.version, vers_2_000, sizeof vers_2_000) == 0) {
			version_major = 2;
			version_minor = 0;
			file_type = WTAP_FILE_NETXRAY_2_00x;
		} else if (memcmp(hdr.version, vers_2_001, sizeof vers_2_001) == 0) {
			version_major = 2;
			version_minor = 1;
			file_type = WTAP_FILE_NETXRAY_2_00x;
		} else if (memcmp(hdr.version, vers_2_002, sizeof vers_2_002) == 0) {
			version_major = 2;
			version_minor = 2;
			file_type = WTAP_FILE_NETXRAY_2_00x;
		} else if (memcmp(hdr.version, vers_2_003, sizeof vers_2_003) == 0) {
			version_major = 2;
			version_minor = 3;
			file_type = WTAP_FILE_NETXRAY_2_00x;
		} else {
			*err = WTAP_ERR_UNSUPPORTED;
			*err_info = g_strdup_printf("netxray: version \"%.8s\" unsupported", hdr.version);
			return -1;
		}
	}

	switch (hdr.xxz[0]) {

	case 0:
		/*
		 * The byte after hdr.network is usually 0, in which case
		 * the hdr.network byte is an NDIS network type value - 1.
		 */
		network_type = hdr.network + 1;
		break;

	case 2:
		/*
		 * However, in some Ethernet captures, it's 2, and the
		 * hdr.network byte is 1 rather than 0.  We assume
		 * that if there's a byte after hdr.network with the value
		 * 2, the hdr.network byte is an NDIS network type, rather
		 * than an NDIS network type - 1.
		 */
		network_type = hdr.network;
		break;

	default:
		*err = WTAP_ERR_UNSUPPORTED;
		*err_info = g_strdup_printf("netxray: the byte after the network type has the value %u, which I don't understand",
		    hdr.xxz[0]);
		return -1;
	}

	if (network_type >= NUM_NETXRAY_ENCAPS
	    || netxray_encap[network_type] == WTAP_ENCAP_UNKNOWN) {
		*err = WTAP_ERR_UNSUPPORTED_ENCAP;
		*err_info = g_strdup_printf("netxray: network type %u (%u) unknown or unsupported",
		    network_type, hdr.xxz[0]);
		return -1;
	}

	/*
	 * Figure out the time stamp units and start time stamp.
	 */
	start_timestamp = (double)pletohl(&hdr.timelo)
	    + (double)pletohl(&hdr.timehi)*4294967296.0;
	switch (file_type) {

	case WTAP_FILE_NETXRAY_OLD:
		timeunit = 1000.0;
		break;

	case WTAP_FILE_NETXRAY_1_0:
		timeunit = 1000.0;
		break;

	case WTAP_FILE_NETXRAY_1_1:
		/*
		 * In version 1.1 files (as produced by Windows Sniffer
		 * Pro 2.0.01), the time stamp is in microseconds,
		 * rather than the milliseconds time stamps in NetXRay
		 * and older versions of Windows Sniffer.
		 */
		timeunit = 1000000.0;
		break;

	case WTAP_FILE_NETXRAY_2_00x:
		/*
		 * Get the time stamp value from the appropriate TpS
		 * table.
		 */
		switch (network_type) {

		case 1:
			/*
			 * Ethernet - the table to use depends on whether
			 * this is an NDIS or pod capture.
			 */
			switch (hdr.xxc[4]) {

			case CAPTYPE_NDIS:
				if (hdr.timeunit > NUM_NETXRAY_TIMEUNITS) {
					*err = WTAP_ERR_UNSUPPORTED;
					*err_info = g_strdup_printf(
					    "netxray: Unknown timeunit %u for Ethernet/CAPTYPE_NDIS version %.8s capture",
					    hdr.timeunit, hdr.version);
					return -1;
				}
				timeunit = TpS[hdr.timeunit];
				break;

			case ETH_CAPTYPE_GIGPOD:
				if (hdr.timeunit > NUM_NETXRAY_TIMEUNITS_GIGPOD
				    || TpS_gigpod[hdr.timeunit] == 0.0) {
					*err = WTAP_ERR_UNSUPPORTED;
					*err_info = g_strdup_printf(
					    "netxray: Unknown timeunit %u for Ethernet/ETH_CAPTYPE_GIGPOD version %.8s capture",
					    hdr.timeunit, hdr.version);
					return -1;
				}
				timeunit = TpS_gigpod[hdr.timeunit];

				/*
				 * At least for 002.002 and 002.003
				 * captures, the start time stamp is 0,
				 * not the value in the file.
				 */
				if (version_minor == 2 || version_minor == 3)
					start_timestamp = 0.0;
				break;

			case ETH_CAPTYPE_OTHERPOD:
				if (hdr.timeunit > NUM_NETXRAY_TIMEUNITS_OTHERPOD
				    || TpS_otherpod[hdr.timeunit] == 0.0) {
					*err = WTAP_ERR_UNSUPPORTED;
					*err_info = g_strdup_printf(
					    "netxray: Unknown timeunit %u for Ethernet/ETH_CAPTYPE_OTHERPOD version %.8s capture",
					    hdr.timeunit, hdr.version);
					return -1;
				}
				timeunit = TpS_otherpod[hdr.timeunit];

				/*
				 * At least for 002.002 and 002.003
				 * captures, the start time stamp is 0,
				 * not the value in the file.
				 */
				if (version_minor == 2 || version_minor == 3)
					start_timestamp = 0.0;
				break;

			case ETH_CAPTYPE_GIGPOD2:
				if (hdr.timeunit > NUM_NETXRAY_TIMEUNITS_GIGPOD2
				    || TpS_gigpod2[hdr.timeunit] == 0.0) {
					*err = WTAP_ERR_UNSUPPORTED;
					*err_info = g_strdup_printf(
					    "netxray: Unknown timeunit %u for Ethernet/ETH_CAPTYPE_GIGPOD2 version %.8s capture",
					    hdr.timeunit, hdr.version);
					return -1;
				}
				timeunit = TpS_gigpod2[hdr.timeunit];
				break;

			default:
				*err = WTAP_ERR_UNSUPPORTED;
				*err_info = g_strdup_printf(
				    "netxray: Unknown capture type %u for Ethernet version %.8s capture",
				    hdr.xxc[4], hdr.version);
				return -1;
			}
			break;

		default:
			if (hdr.timeunit > NUM_NETXRAY_TIMEUNITS) {
				*err = WTAP_ERR_UNSUPPORTED;
				*err_info = g_strdup_printf(
				    "netxray: Unknown timeunit %u for %u/%u version %.8s capture",
				    hdr.timeunit, network_type, hdr.xxc[4],
				    hdr.version);
				return -1;
			}
			timeunit = TpS[hdr.timeunit];
			break;
		}
		break;

	default:
		g_assert_not_reached();
		timeunit = 0.0;
	}
	start_timestamp = start_timestamp/timeunit;

	if (network_type == 4) {
		/*
		 * In version 0 and 1, we assume, for now, that all
		 * WAN captures have frames that look like Ethernet
		 * frames (as a result, presumably, of having passed
		 * through NDISWAN).
		 *
		 * In version 2, it looks as if there's stuff in the "xxc"
		 * words of the file header to specify what particular
		 * type of WAN capture we have.
		 */
		if (version_major == 2) {
			switch (hdr.xxc[4]) {

			case WAN_CAPTYPE_PPP:
				/*
				 * PPP.
				 */
				file_encap = WTAP_ENCAP_PPP_WITH_PHDR;
				break;

			case WAN_CAPTYPE_FRELAY:
				/*
				 * Frame Relay.
				 *
				 * XXX - in at least one capture, this
				 * is Cisco HDLC, not Frame Relay, but
				 * in another capture, it's Frame Relay.
				 *
				 * In the Cisco HDLC capture, hdr.xxc[22:26]
				 * is 0x02 0x00 0x01 0x00 0x06, but it's
				 * 0x00 0x00 0x00 0x00 0x00 in the Frame
				 * Relay capture.  Also, hdr.xxc[30:31]
				 * is 0xff 0xff in the Cisco HDLC capture
				 * and 0x00 0x00 in the Frame Relay capture,
				 * and hdr.xxc[46:47] is 0xff 0xff in the
				 * Cisco HDLC capture and 0x05 0x00 in the
				 * Frame Relay capture.
				 */
				file_encap = WTAP_ENCAP_FRELAY_WITH_PHDR;
				break;

			case WAN_CAPTYPE_HDLC:
			case WAN_CAPTYPE_HDLC2:
				/*
				 * Various HDLC flavors?
				 */
				switch (hdr.xxc[12]) {

				case 0:	/* LAPB/X.25 */
					file_encap = WTAP_ENCAP_LAPB;
					break;

				case 1:	/* E1 PRI */
				case 2:	/* T1 PRI */
				case 3:	/* BRI */
					file_encap = WTAP_ENCAP_ISDN;
					isdn_type = hdr.xxc[12];
					break;

				default:
					*err = WTAP_ERR_UNSUPPORTED_ENCAP;
					*err_info = g_strdup_printf("netxray: WAN HDLC capture subsubtype 0x%02x unknown or unsupported",
					   hdr.xxc[12]);
					return -1;
				}
				break;

			case WAN_CAPTYPE_SDLC:
				/*
				 * SDLC.
				 */
				file_encap = WTAP_ENCAP_SDLC;
				break;

			default:
				*err = WTAP_ERR_UNSUPPORTED_ENCAP;
				*err_info = g_strdup_printf("netxray: WAN capture subtype 0x%02x unknown or unsupported",
				   hdr.xxc[4]);
				return -1;
			}
		} else
			file_encap = WTAP_ENCAP_ETHERNET;
	} else
		file_encap = netxray_encap[network_type];

	/* This is a netxray file */
	wth->file_type = file_type;
	wth->capture.netxray = g_malloc(sizeof(netxray_t));
	wth->subtype_read = netxray_read;
	wth->subtype_seek_read = netxray_seek_read;
	wth->subtype_close = netxray_close;
	wth->file_encap = file_encap;
	wth->snapshot_length = 0;	/* not available in header */
	wth->capture.netxray->start_time = pletohl(&hdr.start_time);
	wth->capture.netxray->timeunit = timeunit;
	wth->capture.netxray->start_timestamp = start_timestamp;
	wth->capture.netxray->version_major = version_major;

	/*
	 * If frames have an extra 4 bytes of stuff at the end, is
	 * it an FCS, or just junk?
	 */
	wth->capture.netxray->fcs_valid = FALSE;
	switch (file_encap) {

	case WTAP_ENCAP_ETHERNET:
	case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
	case WTAP_ENCAP_ISDN:
		/*
		 * It appears that, in at least some version 2 Ethernet
		 * captures, for frames that have 0xff in hdr_2_x.xxx[2]
		 * and hdr_2_x.xxx[3] in the per-packet header:
		 *
		 *	if, in the file header, hdr.realtick[1] is 0x34
		 *	and hdr.realtick[2] is 0x12, the frames have an
		 *	FCS at the end;
		 *
		 *	otherwise, they have 4 bytes of junk at the end.
		 *
		 * Yes, it's strange that you have to check the *middle*
		 * of the time stamp field; you can't check for any
		 * particular value of the time stamp field.
		 *
		 * For now, we assume that to be true for 802.11 captures
		 * as well; it appears to be the case for at least one
		 * such capture - the file doesn't have 0x34 and 0x12,
		 * and the 4 bytes at the end of the frames with 0xff
		 * are junk, not an FCS.
		 *
		 * For ISDN captures, it appears, at least in some
		 * captures, to be similar, although I haven't yet
		 * checked whether it's a valid FCS.
		 *
		 * XXX - should we do this for all encapsulation types?
		 *
		 * XXX - is there some other field that *really* indicates
		 * whether we have an FCS or not?  The check of the time
		 * stamp is bizarre, as we're checking the middle.
		 * Perhaps hdr.realtick[0] is 0x00, in which case time
		 * stamp units in the range 1192960 through 1193215
		 * correspond to captures with an FCS, but that's still
		 * a bit bizarre.
		 *
		 * Note that there are captures with a network type of 0
		 * (Ethernet) and capture type of 0 (NDIS) that do, and
		 * that don't, have 0x34 0x12 in them, and at least one
		 * of the NDIS captures with 0x34 0x12 in it has FCSes,
		 * so it's not as if no NDIS captures have an FCS.
		 *
		 * There are also captures with a network type of 4 (WAN),
		 * capture type of 6 (HDLC), and subtype of 2 (T1 PRI) that
		 * do, and that don't, have 0x34 0x12, so there are at least
		 * some captures taken with a WAN pod that might lack an FCS.
		 * (We haven't yet tried dissecting the 4 bytes at the
		 * end of packets with hdr_2_x.xxx[2] and hdr_2_x.xxx[3]
		 * equal to 0xff as an FCS.)
		 *
		 * All captures I've seen that have 0x34 and 0x12 *and*
		 * have at least one frame with an FCS have a value of
		 * 0x01 in xxb[4].  No captures I've seen with a network
		 * type of 0 (Ethernet) missing 0x34 0x12 have 0x01 there,
		 * however.  However, there's at least one capture
		 * without 0x34 and 0x12, with a network type of 0,
		 * and with 0x01 in xxb[4], *without* FCSes in the
		 * frames - the 4 bytes at the end are all zero - so it's
		 * not as simple as "xxb[4] = 0x01 means the 4 bytes at
		 * the end are FCSes".  Also, there's also at least one
		 * 802.11 capture with an xxb[4] value of 0x01 with junk
		 * rather than an FCS at the end of the frame, so xxb[4]
		 * isn't an obvious flag to determine whether the
		 * capture has FCSes.
		 *
		 * There don't seem to be any other values in xxb or xxc
		 * that obviously correspond to frames having an FCS.
		 */
		if (version_major == 2) {
			if (hdr.realtick[1] == 0x34 && hdr.realtick[2] == 0x12)
				wth->capture.netxray->fcs_valid = TRUE;
		}
		break;
	}

	/*
	 * Remember the ISDN type, as we need it to interpret the
	 * channel number in ISDN captures.
	 */
	wth->capture.netxray->isdn_type = isdn_type;

	/* Remember the offset after the last packet in the capture (which
	 * isn't necessarily the last packet in the file), as it appears
	 * there's sometimes crud after it. */
	wth->capture.netxray->wrapped = FALSE;
	wth->capture.netxray->end_offset = pletohl(&hdr.end_offset);

	/* Seek to the beginning of the data records. */
	if (file_seek(wth->fh, pletohl(&hdr.start_offset), SEEK_SET, err) == -1) {
		g_free(wth->capture.netxray);
		return -1;
	}
	wth->data_offset = pletohl(&hdr.start_offset);

	return 1;
}

/* Read the next packet */
static gboolean netxray_read(wtap *wth, int *err, gchar **err_info _U_,
    long *data_offset)
{
	guint32	packet_size;
	union netxrayrec_hdr hdr;
	int	hdr_size;
	double	t;
	guint8  *pd;
	guint	padding;

reread:
	/* Have we reached the end of the packet data? */
	if (wth->data_offset == wth->capture.netxray->end_offset) {
		/* Yes. */
		*err = 0;	/* it's just an EOF, not an error */
		return FALSE;
	}
	/* Read record header. */
	hdr_size = netxray_read_rec_header(wth, wth->fh, &hdr, err);
	if (hdr_size == 0) {
		/*
		 * Error or EOF.
		 */
		if (*err != 0) {
			/*
			 * Error of some sort; give up.
			 */
			return FALSE;
		}

		/* We're at EOF.  Wrap? */
		if (!wth->capture.netxray->wrapped) {
			/* Yes.  Remember that we did. */
			wth->capture.netxray->wrapped = TRUE;
			if (file_seek(wth->fh, CAPTUREFILE_HEADER_SIZE,
			    SEEK_SET, err) == -1)
				return FALSE;
			wth->data_offset = CAPTUREFILE_HEADER_SIZE;
			goto reread;
		}

		/* We've already wrapped - don't wrap again. */
		return FALSE;
	}

	/*
	 * Return the offset of the record header, so we can reread it
	 * if we go back to this frame.
	 */
	*data_offset = wth->data_offset;
	wth->data_offset += hdr_size;

	/*
	 * Read the packet data.
	 */
	if (wth->capture.netxray->version_major == 0)
		packet_size = pletohs(&hdr.old_hdr.len);
	else
		packet_size = pletohs(&hdr.hdr_1_x.incl_len);
	buffer_assure_space(wth->frame_buffer, packet_size);
	pd = buffer_start_ptr(wth->frame_buffer);
	if (!netxray_read_rec_data(wth->fh, pd, packet_size, err))
		return FALSE;
	wth->data_offset += packet_size;

	/*
	 * Set the pseudo-header.
	 */
	padding = netxray_set_pseudo_header(wth, pd, packet_size,
	    &wth->pseudo_header, &hdr);

	if (wth->capture.netxray->version_major == 0) {
		t = (double)pletohl(&hdr.old_hdr.timelo)
		    + (double)pletohl(&hdr.old_hdr.timehi)*4294967296.0;
		t /= wth->capture.netxray->timeunit;
		t -= wth->capture.netxray->start_timestamp;
		wth->phdr.ts.secs = wth->capture.netxray->start_time + (long)t;
		wth->phdr.ts.nsecs = (unsigned long)((t-(double)(unsigned long)(t))
			*1.0e9);
		/*
		 * We subtract the padding from the packet size, so our caller
		 * doesn't see it.
		 */
		wth->phdr.caplen = packet_size - padding;
		wth->phdr.len = wth->phdr.caplen;
	} else {
		t = (double)pletohl(&hdr.hdr_1_x.timelo)
		    + (double)pletohl(&hdr.hdr_1_x.timehi)*4294967296.0;
		t /= wth->capture.netxray->timeunit;
		t -= wth->capture.netxray->start_timestamp;
		wth->phdr.ts.secs = wth->capture.netxray->start_time + (long)t;
		wth->phdr.ts.nsecs = (unsigned long)((t-(double)(unsigned long)(t))
			*1.0e9);
		/*
		 * We subtract the padding from the packet size, so our caller
		 * doesn't see it.
		 */
		wth->phdr.caplen = packet_size - padding;
		wth->phdr.len = pletohs(&hdr.hdr_1_x.orig_len) - padding;
	}

	return TRUE;
}

static gboolean
netxray_seek_read(wtap *wth, long seek_off,
    union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
    int *err, gchar **err_info _U_)
{
	union netxrayrec_hdr hdr;
	gboolean ret;

	if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
		return FALSE;

	if (!netxray_read_rec_header(wth, wth->random_fh, &hdr, err)) {
		if (*err == 0) {
			/*
			 * EOF - we report that as a short read, as
			 * we've read this once and know that it
			 * should be there.
			 */
			*err = WTAP_ERR_SHORT_READ;
		}
		return FALSE;
	}

	/*
	 * Read the packet data.
	 */
	ret = netxray_read_rec_data(wth->random_fh, pd, length, err);
	if (!ret)
		return FALSE;

	/*
	 * Set the pseudo-header.
	 */
	netxray_set_pseudo_header(wth, pd, length, pseudo_header, &hdr);
	return TRUE;
}

static int
netxray_read_rec_header(wtap *wth, FILE_T fh, union netxrayrec_hdr *hdr,
    int *err)
{
	int	bytes_read;
	int	hdr_size = 0;

	/* Read record header. */
	switch (wth->capture.netxray->version_major) {

	case 0:
		hdr_size = sizeof (struct old_netxrayrec_hdr);
		break;

	case 1:
		hdr_size = sizeof (struct netxrayrec_1_x_hdr);
		break;

	case 2:
		hdr_size = sizeof (struct netxrayrec_2_x_hdr);
		break;
	}
	errno = WTAP_ERR_CANT_READ;
	bytes_read = file_read(hdr, 1, hdr_size, fh);
	if (bytes_read != hdr_size) {
		*err = file_error(wth->fh);
		if (*err != 0)
			return 0;
		if (bytes_read != 0) {
			*err = WTAP_ERR_SHORT_READ;
			return 0;
		}

		/*
		 * We're at EOF.  "*err" is 0; we return FALSE - that
		 * combination tells our caller we're at EOF.
		 */
		return 0;
	}
	return hdr_size;
}

static guint
netxray_set_pseudo_header(wtap *wth, const guint8 *pd, int len,
    union wtap_pseudo_header *pseudo_header, union netxrayrec_hdr *hdr)
{
	guint padding = 0;

	/*
	 * If this is Ethernet, 802.11, ISDN, X.25, or ATM, set the
	 * pseudo-header.
	 */
	switch (wth->capture.netxray->version_major) {

	case 1:
		switch (wth->file_encap) {

		case WTAP_ENCAP_ETHERNET:
			/*
			 * XXX - if hdr->hdr_1_x.xxx[15] is 1
			 * the frame appears not to have any extra
			 * stuff at the end, but if it's 0,
			 * there appears to be 4 bytes of stuff
			 * at the end, but it's not an FCS.
			 *
			 * Or is that just the low-order bit?
			 *
			 * For now, we just say "no FCS".
			 */
			pseudo_header->eth.fcs_len = 0;
			break;
		}
		break;

	case 2:
		switch (wth->file_encap) {

		case WTAP_ENCAP_ETHERNET:
			/*
			 * It appears, at least with version 2 captures,
			 * that we have 4 bytes of stuff (which might be
			 * a valid FCS or might be junk) at the end of
			 * the packet if hdr->hdr_2_x.xxx[2] and
			 * hdr->hdr_2_x.xxx[3] are 0xff, and we don't if
			 * they don't.
			 *
			 * It also appears that if the low-order bit of
			 * hdr->hdr_2_x.xxx[8] is set, the packet has a
			 * bad FCS.
			 */
			if (hdr->hdr_2_x.xxx[2] == 0xff &&
			    hdr->hdr_2_x.xxx[3] == 0xff) {
				/*
				 * We have 4 bytes of stuff at the
				 * end of the frame - FCS, or junk?
				 */
			    	if (wth->capture.netxray->fcs_valid) {
					/*
					 * FCS.
					 */
					pseudo_header->eth.fcs_len = 4;
				} else {
					/*
					 * Junk.
					 */
					padding = 4;
				}
			} else
				pseudo_header->eth.fcs_len = 0;
			break;

		case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
			/*
			 * It appears, in one 802.11 capture, that
			 * we have 4 bytes of junk at the ends of
			 * frames in which hdr->hdr_2_x.xxx[2] and
			 * hdr->hdr_2_x.xxx[3] are 0xff; I haven't
			 * seen any frames where it's an FCS, but,
			 * for now, we still check the fcs_valid
			 * flag - I also haven't seen any capture
			 * where we'd set it based on the realtick
			 * value.
			 *
			 * It also appears that if the low-order bit of
			 * hdr->hdr_2_x.xxx[8] is set, the packet has a
			 * bad FCS.  According to Ken Mann, the 0x4 bit
			 * is sometimes also set for errors.
			 *
			 * Ken also says that xxx[11] is 0x5 when the
			 * packet is WEP-encrypted.
			 */
			if (hdr->hdr_2_x.xxx[2] == 0xff &&
			    hdr->hdr_2_x.xxx[3] == 0xff) {
				/*
				 * We have 4 bytes of stuff at the
				 * end of the frame - FCS, or junk?
				 */
			    	if (wth->capture.netxray->fcs_valid) {
					/*
					 * FCS.
					 */
					pseudo_header->ieee_802_11.fcs_len = 4;
				} else {
					/*
					 * Junk.
					 */
					padding = 4;
				}
			} else
				pseudo_header->ieee_802_11.fcs_len = 0;

			pseudo_header->ieee_802_11.channel =
			    hdr->hdr_2_x.xxx[12];
			pseudo_header->ieee_802_11.data_rate =
			    hdr->hdr_2_x.xxx[13];
			pseudo_header->ieee_802_11.signal_level =
			    hdr->hdr_2_x.xxx[14];
			/*
			 * According to Ken Mann, at least in the captures
			 * he's seen, xxx[15] is the noise level, which
			 * is either 0xFF meaning "none reported" or a value
			 * from 0x00 to 0x7F for 0 to 100%.
			 */
			break;

		case WTAP_ENCAP_ISDN:
			/*
			 * ISDN.
			 *
			 * The bottommost bit of byte 12 of "hdr.hdr_2_x.xxx"
			 * is the direction flag.
			 *
			 * The bottom 5 bits of byte 13 of "hdr.hdr_2_x.xxx"
			 * are the channel number, but some mapping is
			 * required for PRI.  (Is it really just the time
			 * slot?)
			 */
			pseudo_header->isdn.uton =
			    (hdr->hdr_2_x.xxx[12] & 0x01);
			pseudo_header->isdn.channel =
			    hdr->hdr_2_x.xxx[13] & 0x1F;
			switch (wth->capture.netxray->isdn_type) {

			case 1:
				/*
				 * E1 PRI.  Channel numbers 0 and 16
				 * are the D channel; channel numbers 1
				 * through 15 are B1 through B15; channel
				 * numbers 17 through 31 are B16 through
				 * B31.
				 */
				if (pseudo_header->isdn.channel == 16)
					pseudo_header->isdn.channel = 0;
				else if (pseudo_header->isdn.channel > 16)
					pseudo_header->isdn.channel -= 1;
				break;

			case 2:
				/*
				 * T1 PRI.  Channel numbers 0 and 24
				 * are the D channel; channel numbers 1
				 * through 23 are B1 through B23.
				 */
				if (pseudo_header->isdn.channel == 24)
					pseudo_header->isdn.channel = 0;
				else if (pseudo_header->isdn.channel > 24)
					pseudo_header->isdn.channel -= 1;
				break;
			}

			/*
			 * It appears, at least with version 2 captures,
			 * that we have 4 bytes of stuff (which might be
			 * a valid FCS or might be junk) at the end of
			 * the packet if hdr->hdr_2_x.xxx[2] and
			 * hdr->hdr_2_x.xxx[3] are 0xff, and we don't if
			 * they don't.
			 *
			 * XXX - does the low-order bit of hdr->hdr_2_x.xxx[8]
			 * indicate a bad FCS, as is the case with
			 * Ethernet?
			 */
			if (hdr->hdr_2_x.xxx[2] == 0xff &&
			    hdr->hdr_2_x.xxx[3] == 0xff) {
				/*
				 * FCS, or junk, at the end.
				 * XXX - is it an FCS if "fcs_valid" is
				 * true?
				 */
				padding = 4;
			}
			break;

		case WTAP_ENCAP_LAPB:
		case WTAP_ENCAP_FRELAY_WITH_PHDR:
			/*
			 * LAPB/X.25 and Frame Relay.
			 *
			 * The bottommost bit of byte 12 of "hdr.hdr_2_x.xxx"
			 * is the direction flag.  (Probably true for other
			 * HDLC encapsulations as well.)
			 */
			pseudo_header->x25.flags =
			    (hdr->hdr_2_x.xxx[12] & 0x01) ? 0x00 : FROM_DCE;
			break;

		case WTAP_ENCAP_PPP_WITH_PHDR:
		case WTAP_ENCAP_SDLC:
			pseudo_header->p2p.sent =
			    (hdr->hdr_2_x.xxx[12] & 0x01) ? TRUE : FALSE;
			break;

		case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
			pseudo_header->atm.flags = 0;
			/*
			 * XXX - is 0x08 an "OAM cell" flag?
			 */
			if (hdr->hdr_2_x.xxx[9] & 0x04)
				pseudo_header->atm.flags |= ATM_RAW_CELL;
			pseudo_header->atm.vpi = hdr->hdr_2_x.xxx[11];
			pseudo_header->atm.vci = pletohs(&hdr->hdr_2_x.xxx[12]);
			pseudo_header->atm.channel =
			    (hdr->hdr_2_x.xxx[15] & 0x10)? 1 : 0;
			pseudo_header->atm.cells = 0;

			switch (hdr->hdr_2_x.xxx[0] & 0xF0) {

			case 0x00:	/* Unknown */
				/*
				 * Infer the AAL, traffic type, and subtype.
				 */
				atm_guess_traffic_type(pd, len,
				    pseudo_header);
				break;

			case 0x50:	/* AAL5 (including signalling) */
				pseudo_header->atm.aal = AAL_5;
				switch (hdr->hdr_2_x.xxx[0] & 0x0F) {

				case 0x09:
				case 0x0a:	/* Signalling traffic */
					pseudo_header->atm.aal = AAL_SIGNALLING;
					pseudo_header->atm.type = TRAF_UNKNOWN;
					pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
					break;

				case 0x0b:	/* ILMI */
					pseudo_header->atm.type = TRAF_ILMI;
					pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
					break;

				case 0x0c:	/* LANE LE Control */
					pseudo_header->atm.type = TRAF_LANE;
					pseudo_header->atm.subtype = TRAF_ST_LANE_LE_CTRL;
					break;

				case 0x0d:
					/*
					 * 0x0d is *mostly* LANE 802.3,
					 * but I've seen an LE Control frame
					 * with 0x0d.
					 */
					pseudo_header->atm.type = TRAF_LANE;
					atm_guess_lane_type(pd, len,
					    pseudo_header);
					break;

				case 0x0f:	/* LLC multiplexed */
					pseudo_header->atm.type = TRAF_LLCMX;	/* XXX */
					pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;	/* XXX */
					break;

				default:
					/*
					 * XXX - discover the other types.
					 */
					pseudo_header->atm.type = TRAF_UNKNOWN;
					pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
					break;
				}
				break;

			default:
				/*
				 * 0x60 seen, and dissected by Sniffer
				 * Pro as a raw cell.
				 *
				 * XXX - discover what those types are.
				 */
				pseudo_header->atm.aal = AAL_UNKNOWN;
				pseudo_header->atm.type = TRAF_UNKNOWN;
				pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
				break;
			}
			break;
		}
		break;
	}
	return padding;
}

static gboolean
netxray_read_rec_data(FILE_T fh, guint8 *data_ptr, guint32 packet_size,
    int *err)
{
	int	bytes_read;

	errno = WTAP_ERR_CANT_READ;
	bytes_read = file_read(data_ptr, 1, packet_size, fh);

	if (bytes_read <= 0 || (guint32)bytes_read != packet_size) {
		*err = file_error(fh);
		if (*err == 0)
			*err = WTAP_ERR_SHORT_READ;
		return FALSE;
	}
	return TRUE;
}

static void
netxray_close(wtap *wth)
{
	g_free(wth->capture.netxray);
}

static const struct {
	int	wtap_encap_value;
	int	ndis_value;
} wtap_encap_1_1[] = {
    { WTAP_ENCAP_ETHERNET, 0 },		/* -> NDIS Ethernet */
    { WTAP_ENCAP_TOKEN_RING, 1 },	/* -> NDIS Token Ring */
    { WTAP_ENCAP_FDDI, 2 },		/* -> NDIS FDDI */
    { WTAP_ENCAP_FDDI_BITSWAPPED, 2 },	/* -> NDIS FDDI */
};
#define NUM_WTAP_ENCAPS_1_1 (sizeof wtap_encap_1_1 / sizeof wtap_encap_1_1[0])

static int
wtap_encap_to_netxray_1_1_encap(int encap)
{
    unsigned int i;

    for (i = 0; i < NUM_WTAP_ENCAPS_1_1; i++) {
    	if (encap == wtap_encap_1_1[i].wtap_encap_value)
	    return wtap_encap_1_1[i].ndis_value;
    }

    return -1;
}

/* Returns 0 if we could write the specified encapsulation type,
   an error indication otherwise. */
int netxray_dump_can_write_encap_1_1(int encap)
{
    /* Per-packet encapsulations aren't supported. */
    if (encap == WTAP_ENCAP_PER_PACKET)
	return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;

    if (wtap_encap_to_netxray_1_1_encap(encap) == -1)
	return WTAP_ERR_UNSUPPORTED_ENCAP;

    return 0;
}

/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
   failure */
gboolean netxray_dump_open_1_1(wtap_dumper *wdh, gboolean cant_seek, int *err)
{
    /* This is a NetXRay file.  We can't fill in some fields in the header
       until all the packets have been written, so we can't write to a
       pipe. */
    if (cant_seek) {
	*err = WTAP_ERR_CANT_WRITE_TO_PIPE;
	return FALSE;
    }

    wdh->subtype_write = netxray_dump_1_1;
    wdh->subtype_close = netxray_dump_close_1_1;

    /* We can't fill in all the fields in the file header, as we
       haven't yet written any packets.  As we'll have to rewrite
       the header when we've written out all the packets, we just
       skip over the header for now. */
    if (fseek(wdh->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET) == -1) {
	*err = errno;
	return FALSE;
    }

    wdh->dump.netxray = g_malloc(sizeof(netxray_dump_t));
    wdh->dump.netxray->first_frame = TRUE;
    wdh->dump.netxray->start.secs = 0;
    wdh->dump.netxray->start.nsecs = 0;
    wdh->dump.netxray->nframes = 0;

    return TRUE;
}

/* Write a record for a packet to a dump file.
   Returns TRUE on success, FALSE on failure. */
static gboolean netxray_dump_1_1(wtap_dumper *wdh,
	const struct wtap_pkthdr *phdr,
	const union wtap_pseudo_header *pseudo_header _U_,
	const guchar *pd, int *err)
{
    netxray_dump_t *netxray = wdh->dump.netxray;
    guint32 timestamp;
    struct netxrayrec_1_x_hdr rec_hdr;
    size_t nwritten;

    /* NetXRay/Windows Sniffer files have a capture start date/time
       in the header, in a UNIX-style format, with one-second resolution,
       and a start time stamp with microsecond resolution that's just
       an arbitrary time stamp relative to some unknown time (boot
       time?), and have times relative to the start time stamp in
       the packet headers; pick the seconds value of the time stamp
       of the first packet as the UNIX-style start date/time, and make
       the high-resolution start time stamp 0, with the time stamp of
       packets being the delta between the stamp of the packet and
       the stamp of the first packet with the microseconds part 0. */
    if (netxray->first_frame) {
	netxray->first_frame = FALSE;
	netxray->start = phdr->ts;
    }

    /* build the header for each packet */
    memset(&rec_hdr, '\0', sizeof(rec_hdr));
    timestamp = (phdr->ts.secs - netxray->start.secs)*1000000 +
        phdr->ts.nsecs / 1000;
    rec_hdr.timelo = htolel(timestamp);
    rec_hdr.timehi = htolel(0);
    rec_hdr.orig_len = htoles(phdr->len);
    rec_hdr.incl_len = htoles(phdr->caplen);

    nwritten = fwrite(&rec_hdr, 1, sizeof(rec_hdr), wdh->fh);
    if (nwritten != sizeof(rec_hdr)) {
	if (nwritten == 0 && ferror(wdh->fh))
	    *err = errno;
	else
	    *err = WTAP_ERR_SHORT_WRITE;
	return FALSE;
    }

    /* write the packet data */
    nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
    if (nwritten != phdr->caplen) {
	if (nwritten == 0 && ferror(wdh->fh))
	    *err = errno;
	else
	    *err = WTAP_ERR_SHORT_WRITE;
	return FALSE;
    }

    netxray->nframes++;

    return TRUE;
}

/* Finish writing to a dump file.
   Returns TRUE on success, FALSE on failure. */
static gboolean netxray_dump_close_1_1(wtap_dumper *wdh, int *err)
{
    char hdr_buf[CAPTUREFILE_HEADER_SIZE - sizeof(netxray_magic)];
    netxray_dump_t *netxray = wdh->dump.netxray;
    guint32 filelen;
    struct netxray_hdr file_hdr;
    size_t nwritten;

    filelen = ftell(wdh->fh);

    /* Go back to beginning */
    fseek(wdh->fh, 0, SEEK_SET);

    /* Rewrite the file header. */
    nwritten = fwrite(netxray_magic, 1, sizeof netxray_magic, wdh->fh);
    if (nwritten != sizeof netxray_magic) {
	if (err != NULL) {
	    if (nwritten == 0 && ferror(wdh->fh))
		*err = errno;
	    else
		*err = WTAP_ERR_SHORT_WRITE;
	}
	return FALSE;
    }

    /* "sniffer" version ? */
    memset(&file_hdr, '\0', sizeof file_hdr);
    memcpy(file_hdr.version, vers_1_1, sizeof vers_1_1);
    file_hdr.start_time = htolel(netxray->start.secs);
    file_hdr.nframes = htolel(netxray->nframes);
    file_hdr.start_offset = htolel(CAPTUREFILE_HEADER_SIZE);
    file_hdr.end_offset = htolel(filelen);
    file_hdr.network = wtap_encap_to_netxray_1_1_encap(wdh->encap);
    file_hdr.timelo = htolel(0);
    file_hdr.timehi = htolel(0);

    memset(hdr_buf, '\0', sizeof hdr_buf);
    memcpy(hdr_buf, &file_hdr, sizeof(file_hdr));
    nwritten = fwrite(hdr_buf, 1, sizeof hdr_buf, wdh->fh);
    if (nwritten != sizeof hdr_buf) {
	if (err != NULL) {
	    if (nwritten == 0 && ferror(wdh->fh))
		*err = errno;
	    else
		*err = WTAP_ERR_SHORT_WRITE;
	}
	return FALSE;
    }

    return TRUE;
}

static const struct {
	int	wtap_encap_value;
	int	ndis_value;
} wtap_encap_2_0[] = {
    { WTAP_ENCAP_ETHERNET, 0 },			/* -> NDIS Ethernet */
    { WTAP_ENCAP_TOKEN_RING, 1 },		/* -> NDIS Token Ring */
    { WTAP_ENCAP_FDDI, 2 },			/* -> NDIS FDDI */
    { WTAP_ENCAP_FDDI_BITSWAPPED, 2 },		/* -> NDIS FDDI */
    { WTAP_ENCAP_PPP_WITH_PHDR, 3 },		/* -> NDIS WAN */
    { WTAP_ENCAP_FRELAY_WITH_PHDR, 3 },		/* -> NDIS WAN */
    { WTAP_ENCAP_LAPB, 3 },			/* -> NDIS WAN */
    { WTAP_ENCAP_SDLC, 3 },			/* -> NDIS WAN */
};
#define NUM_WTAP_ENCAPS_2_0 (sizeof wtap_encap_2_0 / sizeof wtap_encap_2_0[0])

static int
wtap_encap_to_netxray_2_0_encap(int encap)
{
    unsigned int i;

    for (i = 0; i < NUM_WTAP_ENCAPS_2_0; i++) {
    	if (encap == wtap_encap_2_0[i].wtap_encap_value)
	    return wtap_encap_2_0[i].ndis_value;
    }

    return -1;
}

/* Returns 0 if we could write the specified encapsulation type,
   an error indication otherwise. */
int netxray_dump_can_write_encap_2_0(int encap)
{
    /* Per-packet encapsulations aren't supported. */
    if (encap == WTAP_ENCAP_PER_PACKET)
	return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;

    if (wtap_encap_to_netxray_2_0_encap(encap) == -1)
	return WTAP_ERR_UNSUPPORTED_ENCAP;

    return 0;
}

/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
   failure */
gboolean netxray_dump_open_2_0(wtap_dumper *wdh, gboolean cant_seek, int *err)
{
    /* This is a NetXRay file.  We can't fill in some fields in the header
       until all the packets have been written, so we can't write to a
       pipe. */
    if (cant_seek) {
	*err = WTAP_ERR_CANT_WRITE_TO_PIPE;
	return FALSE;
    }

    wdh->subtype_write = netxray_dump_2_0;
    wdh->subtype_close = netxray_dump_close_2_0;

    /* We can't fill in all the fields in the file header, as we
       haven't yet written any packets.  As we'll have to rewrite
       the header when we've written out all the packets, we just
       skip over the header for now. */
    if (fseek(wdh->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET) == -1) {
	*err = errno;
	return FALSE;
    }

    wdh->dump.netxray = g_malloc(sizeof(netxray_dump_t));
    wdh->dump.netxray->first_frame = TRUE;
    wdh->dump.netxray->start.secs = 0;
    wdh->dump.netxray->start.nsecs = 0;
    wdh->dump.netxray->nframes = 0;

    return TRUE;
}

/* Write a record for a packet to a dump file.
   Returns TRUE on success, FALSE on failure. */
static gboolean netxray_dump_2_0(wtap_dumper *wdh,
	const struct wtap_pkthdr *phdr,
	const union wtap_pseudo_header *pseudo_header _U_,
	const guchar *pd, int *err)
{
    netxray_dump_t *netxray = wdh->dump.netxray;
    guint32 timestamp;
    struct netxrayrec_2_x_hdr rec_hdr;
    size_t nwritten;

    /* NetXRay/Windows Sniffer files have a capture start date/time
       in the header, in a UNIX-style format, with one-second resolution,
       and a start time stamp with microsecond resolution that's just
       an arbitrary time stamp relative to some unknown time (boot
       time?), and have times relative to the start time stamp in
       the packet headers; pick the seconds value of the time stamp
       of the first packet as the UNIX-style start date/time, and make
       the high-resolution start time stamp 0, with the time stamp of
       packets being the delta between the stamp of the packet and
       the stamp of the first packet with the microseconds part 0. */
    if (netxray->first_frame) {
	netxray->first_frame = FALSE;
	netxray->start = phdr->ts;
    }

    /* build the header for each packet */
    memset(&rec_hdr, '\0', sizeof(rec_hdr));
    timestamp = (phdr->ts.secs - netxray->start.secs)*1000000 +
        phdr->ts.nsecs/1000;
    rec_hdr.timelo = htolel(timestamp);
    rec_hdr.timehi = htolel(0);
    rec_hdr.orig_len = htoles(phdr->len);
    rec_hdr.incl_len = htoles(phdr->caplen);

    switch (phdr->pkt_encap) {

    case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
	rec_hdr.xxx[12] = pseudo_header->ieee_802_11.channel;
	rec_hdr.xxx[13] = pseudo_header->ieee_802_11.data_rate;
	rec_hdr.xxx[14] = pseudo_header->ieee_802_11.signal_level;
	break;

    case WTAP_ENCAP_PPP_WITH_PHDR:
    case WTAP_ENCAP_SDLC:
	rec_hdr.xxx[12] |= pseudo_header->p2p.sent ? 0x01 : 0x00;
	break;

    case WTAP_ENCAP_FRELAY_WITH_PHDR:
	rec_hdr.xxx[12] |= (pseudo_header->x25.flags & FROM_DCE) ? 0x00 : 0x01;
	break;
    }

    nwritten = fwrite(&rec_hdr, 1, sizeof(rec_hdr), wdh->fh);
    if (nwritten != sizeof(rec_hdr)) {
	if (nwritten == 0 && ferror(wdh->fh))
	    *err = errno;
	else
	    *err = WTAP_ERR_SHORT_WRITE;
	return FALSE;
    }

    /* write the packet data */
    nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
    if (nwritten != phdr->caplen) {
	if (nwritten == 0 && ferror(wdh->fh))
	    *err = errno;
	else
	    *err = WTAP_ERR_SHORT_WRITE;
	return FALSE;
    }

    netxray->nframes++;

    return TRUE;
}

/* Finish writing to a dump file.
   Returns TRUE on success, FALSE on failure. */
static gboolean netxray_dump_close_2_0(wtap_dumper *wdh, int *err)
{
    char hdr_buf[CAPTUREFILE_HEADER_SIZE - sizeof(netxray_magic)];
    netxray_dump_t *netxray = wdh->dump.netxray;
    guint32 filelen;
    struct netxray_hdr file_hdr;
    size_t nwritten;

    filelen = ftell(wdh->fh);

    /* Go back to beginning */
    fseek(wdh->fh, 0, SEEK_SET);

    /* Rewrite the file header. */
    nwritten = fwrite(netxray_magic, 1, sizeof netxray_magic, wdh->fh);
    if (nwritten != sizeof netxray_magic) {
	if (err != NULL) {
	    if (nwritten == 0 && ferror(wdh->fh))
		*err = errno;
	    else
		*err = WTAP_ERR_SHORT_WRITE;
	}
	return FALSE;
    }

    /* "sniffer" version ? */
    memset(&file_hdr, '\0', sizeof file_hdr);
    memcpy(file_hdr.version, vers_2_001, sizeof vers_2_001);
    file_hdr.start_time = htolel(netxray->start.secs);
    file_hdr.nframes = htolel(netxray->nframes);
    file_hdr.start_offset = htolel(CAPTUREFILE_HEADER_SIZE);
    file_hdr.end_offset = htolel(filelen);
    file_hdr.network = wtap_encap_to_netxray_2_0_encap(wdh->encap);
    file_hdr.timelo = htolel(0);
    file_hdr.timehi = htolel(0);
    switch (wdh->encap) {

    case WTAP_ENCAP_PPP_WITH_PHDR:
	file_hdr.xxc[4] = WAN_CAPTYPE_PPP;
	break;

    case WTAP_ENCAP_FRELAY_WITH_PHDR:
	file_hdr.xxc[4] = WAN_CAPTYPE_FRELAY;
	break;

    case WTAP_ENCAP_LAPB:
	file_hdr.xxc[4] = WAN_CAPTYPE_HDLC;
	file_hdr.xxc[12] = 0;
	break;

    case WTAP_ENCAP_SDLC:
	file_hdr.xxc[4] = WAN_CAPTYPE_SDLC;
	break;

    default:
	file_hdr.xxc[4] = CAPTYPE_NDIS;
	break;
    }

    memset(hdr_buf, '\0', sizeof hdr_buf);
    memcpy(hdr_buf, &file_hdr, sizeof(file_hdr));
    nwritten = fwrite(hdr_buf, 1, sizeof hdr_buf, wdh->fh);
    if (nwritten != sizeof hdr_buf) {
	if (err != NULL) {
	    if (nwritten == 0 && ferror(wdh->fh))
		*err = errno;
	    else
		*err = WTAP_ERR_SHORT_WRITE;
	}
	return FALSE;
    }

    return TRUE;
}