aboutsummaryrefslogtreecommitdiffstats
path: root/text2pcap.c
blob: bd72a5e975a83fb4da3c0b2830b519fddda7f1d5 (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
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
/**-*-C-*-**********************************************************************
 *
 * text2pcap.c
 *
 * Utility to convert an ASCII hexdump into a libpcap-format capture file
 *
 * (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *******************************************************************************/

/*******************************************************************************
 *
 * This utility reads in an ASCII hexdump of this common format:
 *
 * 00000000  00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
 * 00000010  03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3.....
 * 00000020  03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
 * 00000030  01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
 *
 * Each bytestring line consists of an offset, one or more bytes, and
 * text at the end. An offset is defined as a hex string of more than
 * two characters. A byte is defined as a hex string of exactly two
 * characters. The text at the end is ignored, as is any text before
 * the offset. Bytes read from a bytestring line are added to the
 * current packet only if all the following conditions are satisfied:
 *
 * - No text appears between the offset and the bytes (any bytes appearing after
 *   such text would be ignored)
 *
 * - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
 *   exactly 32 bytes must have been read into this packet before this. If the offset
 *   is wrong, the packet is immediately terminated
 *
 * A packet start is signaled by a zero offset.
 *
 * Lines starting with #TEXT2PCAP are directives. These allow the user
 * to embed instructions into the capture file which allows text2pcap
 * to take some actions (e.g. specifying the encapsulation
 * etc.). Currently no directives are implemented.
 *
 * Lines beginning with # which are not directives are ignored as
 * comments. Currently all non-hexdump text is ignored by text2pcap;
 * in the future, text processing may be added, but lines prefixed
 * with '#' will still be ignored.
 *
 * The output is a libpcap packet containing Ethernet frames by
 * default. This program takes options which allow the user to add
 * dummy Ethernet, IP and UDP or TCP headers to the packets in order
 * to allow dumps of L3 or higher protocols to be decoded.
 *
 * Considerable flexibility is built into this code to read hexdumps
 * of slightly different formats. For example, any text prefixing the
 * hexdump line is dropped (including mail forwarding '>'). The offset
 * can be any hex number of four digits or greater.
 *
 * This converter cannot read a single packet greater than 64KiB-1. Packet
 * snaplength is automatically set to 64KiB-1.
 */

#include <config.h>

/*
 * Just make sure we include the prototype for strptime as well
 * (needed for glibc 2.2) but make sure we do this only if not
 * yet defined.
 */
#ifndef __USE_XOPEN
#  define __USE_XOPEN
#endif
#ifndef _XOPEN_SOURCE
#  ifndef __sun
#    define _XOPEN_SOURCE 600
#  endif
#endif

/*
 * Defining _XOPEN_SOURCE is needed on some platforms, e.g. platforms
 * using glibc, to expand the set of things system header files define.
 *
 * Unfortunately, on other platforms, such as some versions of Solaris
 * (including Solaris 10), it *reduces* that set as well, causing
 * strptime() not to be declared, presumably because the version of the
 * X/Open spec that _XOPEN_SOURCE implies doesn't include strptime() and
 * blah blah blah namespace pollution blah blah blah.
 *
 * So we define __EXTENSIONS__ so that "strptime()" is declared.
 */
#ifndef __EXTENSIONS__
#  define __EXTENSIONS__
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wsutil/file_util.h>
#include <wsutil/crash_info.h>
#include <wsutil/ws_diag_control.h>
#include <wsutil/ws_version_info.h>

#include <time.h>
#include <glib.h>

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

#include <errno.h>
#include <assert.h>

#ifdef HAVE_LIBZ
#include <zlib.h>      /* to get the libz version number */
#endif

#ifndef HAVE_GETOPT_LONG
#include "wsutil/wsgetopt.h"
#endif

#ifndef HAVE_STRPTIME
# include "wsutil/strptime.h"
#endif

#include "pcapio.h"
#include "text2pcap.h"

#ifdef _WIN32
#include <wsutil/unicode-utils.h>
#endif /* _WIN32 */

#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>       /* needed to define AF_ values on Windows */
#endif

#ifndef HAVE_INET_ATON
# include "wsutil/inet_aton.h"
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef NEED_INET_V6DEFS_H
# include "wsutil/inet_v6defs.h"
#endif

/*--- Options --------------------------------------------------------------------*/

/* File format */
static gboolean use_pcapng = FALSE;

/* Debug level */
static int debug = 0;
/* Be quiet */
static int quiet = FALSE;

/* Dummy Ethernet header */
static int hdr_ethernet = FALSE;
static guint32 hdr_ethernet_proto = 0;

/* Dummy IP header */
static int hdr_ip = FALSE;
static int hdr_ipv6 = FALSE;
static long hdr_ip_proto = 0;

/* Destination and source addresses for IP header */
static guint32 hdr_ip_dest_addr = 0;
static guint32 hdr_ip_src_addr = 0;
static guint8 hdr_ipv6_dest_addr[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
static guint8 hdr_ipv6_src_addr[16]  = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
static guint8 NO_IPv6_ADDRESS[16]    = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

/* Dummy UDP header */
static int     hdr_udp       = FALSE;
static guint32 hdr_dest_port = 0;
static guint32 hdr_src_port  = 0;

/* Dummy TCP header */
static int hdr_tcp = FALSE;

/* TCP sequence numbers when has_direction is true */
static guint32 tcp_in_seq_num = 0;
static guint32 tcp_out_seq_num = 0;

/* Dummy SCTP header */
static int hdr_sctp = FALSE;
static guint32 hdr_sctp_src  = 0;
static guint32 hdr_sctp_dest = 0;
static guint32 hdr_sctp_tag  = 0;

/* Dummy DATA chunk header */
static int hdr_data_chunk = FALSE;
static guint8  hdr_data_chunk_type = 0;
static guint8  hdr_data_chunk_bits = 0;
static guint32 hdr_data_chunk_tsn  = 0;
static guint16 hdr_data_chunk_sid  = 0;
static guint16 hdr_data_chunk_ssn  = 0;
static guint32 hdr_data_chunk_ppid = 0;

/* ASCII text dump identification */
static int identify_ascii = FALSE;

static gboolean has_direction = FALSE;
static guint32 direction = 0;

/*--- Local date -----------------------------------------------------------------*/

/* This is where we store the packet currently being built */
#define MAX_PACKET 65535
static guint8  packet_buf[MAX_PACKET];
static guint32 header_length;
static guint32 ip_offset;
static guint32 curr_offset;
static guint32 max_offset = MAX_PACKET;
static guint32 packet_start = 0;

static void start_new_packet(gboolean);

/* This buffer contains strings present before the packet offset 0 */
#define PACKET_PREAMBLE_MAX_LEN     2048
static guint8 packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
static int    packet_preamble_len = 0;

/* Number of packets read and written */
static guint32 num_packets_read    = 0;
static guint32 num_packets_written = 0;
static guint64 bytes_written       = 0;

/* Time code of packet, derived from packet_preamble */
static time_t   ts_sec  = 0;
static guint32  ts_nsec = 0;
static char    *ts_fmt  = NULL;
static struct tm timecode_default;

static guint8* pkt_lnstart;

/* Input file */
static const char *input_filename;
static FILE       *input_file  = NULL;
/* Output file */
static const char *output_filename;
static FILE       *output_file = NULL;

/* Offset base to parse */
static guint32 offset_base = 16;

extern FILE *yyin;

/* ----- State machine -----------------------------------------------------------*/

/* Current state of parser */
typedef enum {
    INIT,             /* Waiting for start of new packet */
    START_OF_LINE,    /* Starting from beginning of line */
    READ_OFFSET,      /* Just read the offset */
    READ_BYTE,        /* Just read a byte */
    READ_TEXT         /* Just read text - ignore until EOL */
} parser_state_t;
static parser_state_t state = INIT;

static const char *state_str[] = {"Init",
                           "Start-of-line",
                           "Offset",
                           "Byte",
                           "Text"
};

static const char *token_str[] = {"",
                           "Byte",
                           "Offset",
                           "Directive",
                           "Text",
                           "End-of-line"
};

/* ----- Skeleton Packet Headers --------------------------------------------------*/

typedef struct {
    guint8  dest_addr[6];
    guint8  src_addr[6];
    guint16 l3pid;
} hdr_ethernet_t;

static hdr_ethernet_t HDR_ETHERNET = {
    {0x0a, 0x02, 0x02, 0x02, 0x02, 0x02},
    {0x0a, 0x01, 0x01, 0x01, 0x01, 0x01},
    0};

typedef struct {
    guint8  ver_hdrlen;
    guint8  dscp;
    guint16 packet_length;
    guint16 identification;
    guint8  flags;
    guint8  fragment;
    guint8  ttl;
    guint8  protocol;
    guint16 hdr_checksum;
    guint32 src_addr;
    guint32 dest_addr;
} hdr_ip_t;

static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0,
#ifdef WORDS_BIGENDIAN
0x0a010101, 0x0a020202
#else
0x0101010a, 0x0202020a
#endif
};

/* Fixed IP address values */
#ifdef WORDS_BIGENDIAN
#define IP_SRC 0x0a010101
#define IP_DST 0x0a020202
#else
#define IP_SRC 0x0101010a
#define IP_DST 0x0202020a
#endif

static struct {         /* pseudo header for checksum calculation */
    guint32 src_addr;
    guint32 dest_addr;
    guint8  zero;
    guint8  protocol;
    guint16 length;
} pseudoh;


/* headers taken from glibc */

/* IPv6 address */
struct hdr_in6_addr
{
    union
    {
       guint8  __u6_addr8[16];
       guint16 __u6_addr16[8];
       guint32 __u6_addr32[4];
    } __in6_u;
};

typedef struct {
    union  {
        struct ip6_hdrctl {
            guint32 ip6_un1_flow;   /* 24 bits of flow-ID */
            guint16 ip6_un1_plen;   /* payload length */
            guint8  ip6_un1_nxt;    /* next header */
            guint8  ip6_un1_hlim;   /* hop limit */
        } ip6_un1;
        guint8 ip6_un2_vfc;       /* 4 bits version, 4 bits priority */
    } ip6_ctlun;
    struct hdr_in6_addr ip6_src;      /* source address */
    struct hdr_in6_addr ip6_dst;      /* destination address */
} hdr_ipv6_t;

static hdr_ipv6_t HDR_IPv6;

static struct {                 /* pseudo header ipv6 for checksum calculation */
    struct  hdr_in6_addr src_addr6;
    struct  hdr_in6_addr dst_addr6;
    guint32 protocol;
    guint32 zero;
} pseudoh6;


typedef struct {
    guint16 source_port;
    guint16 dest_port;
    guint16 length;
    guint16 checksum;
} hdr_udp_t;

static hdr_udp_t HDR_UDP = {0, 0, 0, 0};

typedef struct {
    guint16 source_port;
    guint16 dest_port;
    guint32 seq_num;
    guint32 ack_num;
    guint8  hdr_length;
    guint8  flags;
    guint16 window;
    guint16 checksum;
    guint16 urg;
} hdr_tcp_t;

static hdr_tcp_t HDR_TCP = {0, 0, 0, 0, 0x50, 0, 0, 0, 0};

typedef struct {
    guint16 src_port;
    guint16 dest_port;
    guint32 tag;
    guint32 checksum;
} hdr_sctp_t;

static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};

typedef struct {
    guint8  type;
    guint8  bits;
    guint16 length;
    guint32 tsn;
    guint16 sid;
    guint16 ssn;
    guint32 ppid;
} hdr_data_chunk_t;

static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};

static char tempbuf[64];

/*----------------------------------------------------------------------
 * Stuff for writing a PCap file
 */
#define PCAP_SNAPLEN        0xffff

/* Link-layer type; see http://www.tcpdump.org/linktypes.html for details */
static guint32 pcap_link_type = 1;   /* Default is LINKTYPE_ETHERNET */

/*----------------------------------------------------------------------
 * Parse a single hex number
 * Will abort the program if it can't parse the number
 * Pass in TRUE if this is an offset, FALSE if not
 */
static guint32
parse_num (const char *str, int offset)
{
    guint32  num;
    char    *c;

    if (str == NULL) {
        fprintf(stderr, "FATAL ERROR: str is NULL\n");
        exit(1);
    }

    num = (guint32)strtoul(str, &c, offset ? offset_base : 16);
    if (c == str) {
        fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
        exit(1);
    }
    return num;
}

/*----------------------------------------------------------------------
 * Write this byte into current packet
 */
static void
write_byte (const char *str)
{
    guint32 num;

    num = parse_num(str, FALSE);
    packet_buf[curr_offset] = (guint8) num;
    curr_offset++;
    if (curr_offset - header_length >= max_offset) /* packet full */
        start_new_packet(TRUE);
}

/*----------------------------------------------------------------------
 * Write a number of bytes into current packet
 */

static void
write_bytes (const char bytes[], guint32 nbytes)
{
    guint32 i;

    if (curr_offset + nbytes < MAX_PACKET) {
        for (i = 0; i < nbytes; i++) {
            packet_buf[curr_offset] = bytes[i];
            curr_offset++;
        }
    }
}

/*----------------------------------------------------------------------
 * Remove bytes from the current packet
 */
static void
unwrite_bytes (guint32 nbytes)
{
    curr_offset -= nbytes;
}

/*----------------------------------------------------------------------
 * Compute one's complement checksum (from RFC1071)
 */
static guint16
in_checksum (void *buf, guint32 count)
{
    guint32 sum = 0;
    guint16 *addr = (guint16 *)buf;

    while (count > 1) {
        /*  This is the inner loop */
        sum += g_ntohs(* (guint16 *) addr);
        addr++;
        count -= 2;
    }

    /*  Add left-over byte, if any */
    if (count > 0)
        sum += g_ntohs(* (guint8 *) addr);

    /*  Fold 32-bit sum to 16 bits */
    while (sum>>16)
        sum = (sum & 0xffff) + (sum >> 16);

    sum = ~sum;
    return g_htons(sum);
}

/* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
 * That code is copyrighted by D. Otis and has been modified.
 */

#define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
static guint32 crc_c[256] =
{
0x00000000U, 0xF26B8303U, 0xE13B70F7U, 0x1350F3F4U,
0xC79A971FU, 0x35F1141CU, 0x26A1E7E8U, 0xD4CA64EBU,
0x8AD958CFU, 0x78B2DBCCU, 0x6BE22838U, 0x9989AB3BU,
0x4D43CFD0U, 0xBF284CD3U, 0xAC78BF27U, 0x5E133C24U,
0x105EC76FU, 0xE235446CU, 0xF165B798U, 0x030E349BU,
0xD7C45070U, 0x25AFD373U, 0x36FF2087U, 0xC494A384U,
0x9A879FA0U, 0x68EC1CA3U, 0x7BBCEF57U, 0x89D76C54U,
0x5D1D08BFU, 0xAF768BBCU, 0xBC267848U, 0x4E4DFB4BU,
0x20BD8EDEU, 0xD2D60DDDU, 0xC186FE29U, 0x33ED7D2AU,
0xE72719C1U, 0x154C9AC2U, 0x061C6936U, 0xF477EA35U,
0xAA64D611U, 0x580F5512U, 0x4B5FA6E6U, 0xB93425E5U,
0x6DFE410EU, 0x9F95C20DU, 0x8CC531F9U, 0x7EAEB2FAU,
0x30E349B1U, 0xC288CAB2U, 0xD1D83946U, 0x23B3BA45U,
0xF779DEAEU, 0x05125DADU, 0x1642AE59U, 0xE4292D5AU,
0xBA3A117EU, 0x4851927DU, 0x5B016189U, 0xA96AE28AU,
0x7DA08661U, 0x8FCB0562U, 0x9C9BF696U, 0x6EF07595U,
0x417B1DBCU, 0xB3109EBFU, 0xA0406D4BU, 0x522BEE48U,
0x86E18AA3U, 0x748A09A0U, 0x67DAFA54U, 0x95B17957U,
0xCBA24573U, 0x39C9C670U, 0x2A993584U, 0xD8F2B687U,
0x0C38D26CU, 0xFE53516FU, 0xED03A29BU, 0x1F682198U,
0x5125DAD3U, 0xA34E59D0U, 0xB01EAA24U, 0x42752927U,
0x96BF4DCCU, 0x64D4CECFU, 0x77843D3BU, 0x85EFBE38U,
0xDBFC821CU, 0x2997011FU, 0x3AC7F2EBU, 0xC8AC71E8U,
0x1C661503U, 0xEE0D9600U, 0xFD5D65F4U, 0x0F36E6F7U,
0x61C69362U, 0x93AD1061U, 0x80FDE395U, 0x72966096U,
0xA65C047DU, 0x5437877EU, 0x4767748AU, 0xB50CF789U,
0xEB1FCBADU, 0x197448AEU, 0x0A24BB5AU, 0xF84F3859U,
0x2C855CB2U, 0xDEEEDFB1U, 0xCDBE2C45U, 0x3FD5AF46U,
0x7198540DU, 0x83F3D70EU, 0x90A324FAU, 0x62C8A7F9U,
0xB602C312U, 0x44694011U, 0x5739B3E5U, 0xA55230E6U,
0xFB410CC2U, 0x092A8FC1U, 0x1A7A7C35U, 0xE811FF36U,
0x3CDB9BDDU, 0xCEB018DEU, 0xDDE0EB2AU, 0x2F8B6829U,
0x82F63B78U, 0x709DB87BU, 0x63CD4B8FU, 0x91A6C88CU,
0x456CAC67U, 0xB7072F64U, 0xA457DC90U, 0x563C5F93U,
0x082F63B7U, 0xFA44E0B4U, 0xE9141340U, 0x1B7F9043U,
0xCFB5F4A8U, 0x3DDE77ABU, 0x2E8E845FU, 0xDCE5075CU,
0x92A8FC17U, 0x60C37F14U, 0x73938CE0U, 0x81F80FE3U,
0x55326B08U, 0xA759E80BU, 0xB4091BFFU, 0x466298FCU,
0x1871A4D8U, 0xEA1A27DBU, 0xF94AD42FU, 0x0B21572CU,
0xDFEB33C7U, 0x2D80B0C4U, 0x3ED04330U, 0xCCBBC033U,
0xA24BB5A6U, 0x502036A5U, 0x4370C551U, 0xB11B4652U,
0x65D122B9U, 0x97BAA1BAU, 0x84EA524EU, 0x7681D14DU,
0x2892ED69U, 0xDAF96E6AU, 0xC9A99D9EU, 0x3BC21E9DU,
0xEF087A76U, 0x1D63F975U, 0x0E330A81U, 0xFC588982U,
0xB21572C9U, 0x407EF1CAU, 0x532E023EU, 0xA145813DU,
0x758FE5D6U, 0x87E466D5U, 0x94B49521U, 0x66DF1622U,
0x38CC2A06U, 0xCAA7A905U, 0xD9F75AF1U, 0x2B9CD9F2U,
0xFF56BD19U, 0x0D3D3E1AU, 0x1E6DCDEEU, 0xEC064EEDU,
0xC38D26C4U, 0x31E6A5C7U, 0x22B65633U, 0xD0DDD530U,
0x0417B1DBU, 0xF67C32D8U, 0xE52CC12CU, 0x1747422FU,
0x49547E0BU, 0xBB3FFD08U, 0xA86F0EFCU, 0x5A048DFFU,
0x8ECEE914U, 0x7CA56A17U, 0x6FF599E3U, 0x9D9E1AE0U,
0xD3D3E1ABU, 0x21B862A8U, 0x32E8915CU, 0xC083125FU,
0x144976B4U, 0xE622F5B7U, 0xF5720643U, 0x07198540U,
0x590AB964U, 0xAB613A67U, 0xB831C993U, 0x4A5A4A90U,
0x9E902E7BU, 0x6CFBAD78U, 0x7FAB5E8CU, 0x8DC0DD8FU,
0xE330A81AU, 0x115B2B19U, 0x020BD8EDU, 0xF0605BEEU,
0x24AA3F05U, 0xD6C1BC06U, 0xC5914FF2U, 0x37FACCF1U,
0x69E9F0D5U, 0x9B8273D6U, 0x88D28022U, 0x7AB90321U,
0xAE7367CAU, 0x5C18E4C9U, 0x4F48173DU, 0xBD23943EU,
0xF36E6F75U, 0x0105EC76U, 0x12551F82U, 0xE03E9C81U,
0x34F4F86AU, 0xC69F7B69U, 0xD5CF889DU, 0x27A40B9EU,
0x79B737BAU, 0x8BDCB4B9U, 0x988C474DU, 0x6AE7C44EU,
0xBE2DA0A5U, 0x4C4623A6U, 0x5F16D052U, 0xAD7D5351U,
};

static guint32
crc32c (const guint8* buf, unsigned int len, guint32 crc32_init)
{
    unsigned int i;
    guint32 crc;

    crc = crc32_init;
    for (i = 0; i < len; i++)
        CRC32C(crc, buf[i]);

    return crc;
}

static guint32
finalize_crc32c (guint32 crc)
{
    guint32 result;
    guint8 byte0,byte1,byte2,byte3;

    result = ~crc;
    byte0 = result & 0xff;
    byte1 = (result>>8) & 0xff;
    byte2 = (result>>16) & 0xff;
    byte3 = (result>>24) & 0xff;
    result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
    return result;
}

static guint16
number_of_padding_bytes (guint32 length)
{
    guint16 remainder;

    remainder = length % 4;

    if (remainder == 0)
        return 0;
    else
        return 4 - remainder;
}

/*----------------------------------------------------------------------
 * Write current packet out
 */
static void
write_current_packet (gboolean cont)
{
    guint32  length         = 0;
    guint16  padding_length = 0;
    int      err;
    guint16  ihatemacros;
    gboolean success;

    if (curr_offset > header_length) {
        /* Write the packet */

        /* Is direction indication on with an inbound packet? */
        gboolean isInbound = has_direction && (direction == 2);

        /* if defined IPv6 we should rewrite hdr_ethernet_proto anyways */
        if (hdr_ipv6) {
            hdr_ethernet_proto = 0x86DD;
            hdr_ip = FALSE;
        }

        /* Compute packet length */
        length = curr_offset;
        if (hdr_sctp) {
            padding_length = number_of_padding_bytes(length - header_length );
        } else {
            padding_length = 0;
        }
        /* Reset curr_offset, since we now write the headers */
        curr_offset = 0;

        /* Write Ethernet header */
        if (hdr_ethernet) {
            HDR_ETHERNET.l3pid = g_htons(hdr_ethernet_proto);
            write_bytes((const char *)&HDR_ETHERNET, sizeof(HDR_ETHERNET));
        }

        /* Write IP header */
        if (hdr_ip) {
            if (isInbound) {
                HDR_IP.src_addr = hdr_ip_dest_addr ? hdr_ip_dest_addr : IP_DST;
                HDR_IP.dest_addr = hdr_ip_src_addr? hdr_ip_src_addr : IP_SRC;
            }
            else {
                HDR_IP.src_addr = hdr_ip_src_addr? hdr_ip_src_addr : IP_SRC;
                HDR_IP.dest_addr = hdr_ip_dest_addr ? hdr_ip_dest_addr : IP_DST;
            }

            HDR_IP.packet_length = g_htons(length - ip_offset + padding_length);
            HDR_IP.protocol = (guint8) hdr_ip_proto;
            HDR_IP.hdr_checksum = 0;
            HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
            write_bytes((const char *)&HDR_IP, sizeof(HDR_IP));
        } else if (hdr_ipv6) {
            if (memcmp(isInbound ? hdr_ipv6_dest_addr : hdr_ipv6_src_addr, NO_IPv6_ADDRESS, sizeof(struct hdr_in6_addr)))
                memcpy(&HDR_IPv6.ip6_src, isInbound ? &hdr_ipv6_dest_addr : &hdr_ipv6_src_addr, sizeof(struct hdr_in6_addr));
            if (memcmp(isInbound ? hdr_ipv6_src_addr : hdr_ipv6_dest_addr, NO_IPv6_ADDRESS, sizeof(struct hdr_in6_addr)))
                memcpy(&HDR_IPv6.ip6_dst, isInbound ? &hdr_ipv6_src_addr : &hdr_ipv6_dest_addr, sizeof(struct hdr_in6_addr));

            HDR_IPv6.ip6_ctlun.ip6_un2_vfc &= 0x0F;
            HDR_IPv6.ip6_ctlun.ip6_un2_vfc |= (6<< 4);
            HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_plen = g_htons(length - ip_offset + padding_length);
            HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_nxt  = (guint8) hdr_ip_proto;
            HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_hlim = 32;
            write_bytes((const char *)&HDR_IPv6, sizeof(HDR_IPv6));

            /* initialize pseudo ipv6 header for checksum calculation */
            pseudoh6.src_addr6  = HDR_IPv6.ip6_src;
            pseudoh6.dst_addr6  = HDR_IPv6.ip6_dst;
            pseudoh6.zero       = 0;
            pseudoh6.protocol   = (guint8) hdr_ip_proto;
            ihatemacros         = g_ntohs(HDR_IPv6.ip6_ctlun.ip6_un1.ip6_un1_plen);
            pseudoh.length      = g_htons(length - ihatemacros + sizeof(HDR_UDP));
        }

        if (!hdr_ipv6) {
            /* initialize pseudo header for checksum calculation */
            pseudoh.src_addr    = HDR_IP.src_addr;
            pseudoh.dest_addr   = HDR_IP.dest_addr;
            pseudoh.zero        = 0;
            pseudoh.protocol    = (guint8) hdr_ip_proto;
            pseudoh.length      = g_htons(length - header_length + sizeof(HDR_UDP));
        }

        /* Write UDP header */
        if (hdr_udp) {
            guint16 x16;
            guint32 u;

            /* initialize the UDP header */
            HDR_UDP.source_port = isInbound ? g_htons(hdr_dest_port): g_htons(hdr_src_port);
            HDR_UDP.dest_port = isInbound ? g_htons(hdr_src_port) : g_htons(hdr_dest_port);
            HDR_UDP.length      = pseudoh.length;
            HDR_UDP.checksum = 0;
            /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
            x16  = hdr_ipv6 ? in_checksum(&pseudoh6, sizeof(pseudoh6)) : in_checksum(&pseudoh, sizeof(pseudoh));
            u    = g_ntohs(x16);
            x16  = in_checksum(&HDR_UDP, sizeof(HDR_UDP));
            u   += g_ntohs(x16);
            x16  = in_checksum(packet_buf + header_length, length - header_length);
            u   += g_ntohs(x16);
            x16  = (u & 0xffff) + (u>>16);
            HDR_UDP.checksum = g_htons(x16);
            if (HDR_UDP.checksum == 0) /* differentiate between 'none' and 0 */
                HDR_UDP.checksum = g_htons(1);
            write_bytes((const char *)&HDR_UDP, sizeof(HDR_UDP));
        }

        /* Write TCP header */
        if (hdr_tcp) {
            guint16 x16;
            guint32 u;

             /* initialize pseudo header for checksum calculation */
            pseudoh.src_addr    = HDR_IP.src_addr;
            pseudoh.dest_addr   = HDR_IP.dest_addr;
            pseudoh.zero        = 0;
            pseudoh.protocol    = (guint8) hdr_ip_proto;
            pseudoh.length      = g_htons(length - header_length + sizeof(HDR_TCP));
            /* initialize the TCP header */
            HDR_TCP.source_port = isInbound ? g_htons(hdr_dest_port): g_htons(hdr_src_port);
            HDR_TCP.dest_port = isInbound ? g_htons(hdr_src_port) : g_htons(hdr_dest_port);
            /* set ack number if we have direction */
            if (has_direction) {
                HDR_TCP.flags = 0x10;
                HDR_TCP.ack_num = g_ntohl(isInbound ? tcp_out_seq_num : tcp_in_seq_num);
                HDR_TCP.ack_num = g_htonl(HDR_TCP.ack_num);
            }
            else {
                HDR_TCP.flags = 0;
                HDR_TCP.ack_num = 0;
            }
            HDR_TCP.seq_num = isInbound ? tcp_in_seq_num : tcp_out_seq_num;
            HDR_TCP.window = g_htons(0x2000);
            HDR_TCP.checksum = 0;
            /* Note: g_ntohs()/g_htons() macro arg may be eval'd twice so calc value before invoking macro */
            x16  = in_checksum(&pseudoh, sizeof(pseudoh));
            u    = g_ntohs(x16);
            x16  = in_checksum(&HDR_TCP, sizeof(HDR_TCP));
            u   += g_ntohs(x16);
            x16  = in_checksum(packet_buf + header_length, length - header_length);
            u   += g_ntohs(x16);
            x16  = (u & 0xffff) + (u>>16);
            HDR_TCP.checksum = g_htons(x16);
            if (HDR_TCP.checksum == 0) /* differentiate between 'none' and 0 */
                HDR_TCP.checksum = g_htons(1);
            write_bytes((const char *)&HDR_TCP, sizeof(HDR_TCP));
            if (isInbound) {
                tcp_in_seq_num = g_ntohl(tcp_in_seq_num) + length - header_length;
                tcp_in_seq_num = g_htonl(tcp_in_seq_num);
            }
            else {
                tcp_out_seq_num = g_ntohl(tcp_out_seq_num) + length - header_length;
                tcp_out_seq_num = g_htonl(tcp_out_seq_num);
            }
        }

        /* Compute DATA chunk header */
        if (hdr_data_chunk) {
            hdr_data_chunk_bits = 0;
            if (packet_start == 0) {
                hdr_data_chunk_bits |= 0x02;
            }
            if (!cont) {
                hdr_data_chunk_bits |= 0x01;
            }
            HDR_DATA_CHUNK.type   = hdr_data_chunk_type;
            HDR_DATA_CHUNK.bits   = hdr_data_chunk_bits;
            HDR_DATA_CHUNK.length = g_htons(length - header_length + sizeof(HDR_DATA_CHUNK));
            HDR_DATA_CHUNK.tsn    = g_htonl(hdr_data_chunk_tsn);
            HDR_DATA_CHUNK.sid    = g_htons(hdr_data_chunk_sid);
            HDR_DATA_CHUNK.ssn    = g_htons(hdr_data_chunk_ssn);
            HDR_DATA_CHUNK.ppid   = g_htonl(hdr_data_chunk_ppid);
            hdr_data_chunk_tsn++;
            if (!cont) {
                hdr_data_chunk_ssn++;
            }
        }

        /* Write SCTP common header */
        if (hdr_sctp) {
            guint32 zero = 0;

            HDR_SCTP.src_port  = isInbound ? g_htons(hdr_sctp_dest): g_htons(hdr_sctp_src);
            HDR_SCTP.dest_port = isInbound ? g_htons(hdr_sctp_src) : g_htons(hdr_sctp_dest);
            HDR_SCTP.tag       = g_htonl(hdr_sctp_tag);
            HDR_SCTP.checksum  = g_htonl(0);
            HDR_SCTP.checksum  = crc32c((guint8 *)&HDR_SCTP, sizeof(HDR_SCTP), ~0);
            if (hdr_data_chunk) {
                HDR_SCTP.checksum  = crc32c((guint8 *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
                HDR_SCTP.checksum  = crc32c((guint8 *)packet_buf + header_length, length - header_length, HDR_SCTP.checksum);
                HDR_SCTP.checksum  = crc32c((guint8 *)&zero, padding_length, HDR_SCTP.checksum);
            } else {
                HDR_SCTP.checksum  = crc32c((guint8 *)packet_buf + header_length, length - header_length, HDR_SCTP.checksum);
            }
            HDR_SCTP.checksum = finalize_crc32c(HDR_SCTP.checksum);
            HDR_SCTP.checksum  = g_htonl(HDR_SCTP.checksum);
            write_bytes((const char *)&HDR_SCTP, sizeof(HDR_SCTP));
        }

        /* Write DATA chunk header */
        if (hdr_data_chunk) {
            write_bytes((const char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK));
        }

        /* Reset curr_offset, since we now write the trailers */
        curr_offset = length;

        /* Write DATA chunk padding */
        if (hdr_data_chunk && (padding_length > 0)) {
            memset(tempbuf, 0, padding_length);
            write_bytes((const char *)&tempbuf, padding_length);
            length += padding_length;
        }

        /* Write Ethernet trailer */
        if (hdr_ethernet && (length < 60)) {
            memset(tempbuf, 0, 60 - length);
            write_bytes((const char *)&tempbuf, 60 - length);
            length = 60;
        }
        if (use_pcapng) {
            success = pcapng_write_enhanced_packet_block(output_file,
                                                         NULL,
                                                         ts_sec, ts_nsec,
                                                         length, length,
                                                         0,
                                                         1000000000,
                                                         packet_buf, direction,
                                                         &bytes_written, &err);
        } else {
            success = libpcap_write_packet(output_file,
                                           ts_sec, ts_nsec/1000,
                                           length, length,
                                           packet_buf,
                                           &bytes_written, &err);
        }
        if (!success) {
            fprintf(stderr, "File write error [%s] : %s\n",
                    output_filename, g_strerror(err));
            exit(1);
        }
        if (ts_fmt == NULL) {
            /* fake packet counter */
            if (use_pcapng)
                ts_nsec++;
            else
                ts_nsec += 1000;
        }
        if (!quiet) {
            fprintf(stderr, "Wrote packet of %u bytes.\n", length);
        }
        num_packets_written++;
    }

    packet_start += curr_offset - header_length;
    curr_offset = header_length;
    return;
}

/*----------------------------------------------------------------------
 * Write file header and trailer
 */
static void
write_file_header (void)
{
    int      err;
    gboolean success;

    if (use_pcapng) {
        char *appname;
        char *comment;

        appname = g_strdup_printf("text2pcap (Wireshark) %s", get_ws_vcs_version_info());
        comment = g_strdup_printf("Generated from input file %s.", input_filename);
        success = pcapng_write_session_header_block(output_file,
                                                    comment,
                                                    NULL,    /* HW */
                                                    NULL,    /* OS */
                                                    appname,
                                                    -1,      /* section_length */
                                                    &bytes_written,
                                                    &err);
        g_free(appname);
        g_free(comment);
        if (success) {
            success = pcapng_write_interface_description_block(output_file,
                                                               NULL,
                                                               NULL,
                                                               NULL,
                                                               "",
                                                               NULL,
                                                               pcap_link_type,
                                                               PCAP_SNAPLEN,
                                                               &bytes_written,
                                                               0,
                                                               9,
                                                               &err);
        }
    } else {
        success = libpcap_write_file_header(output_file, pcap_link_type,
                                            PCAP_SNAPLEN, FALSE,
                                            &bytes_written, &err);
    }
    if (!success) {
        fprintf(stderr, "File write error [%s] : %s\n",
                output_filename, g_strerror(err));
        exit(1);
    }
}

/*----------------------------------------------------------------------
 * Append a token to the packet preamble.
 */
static void
append_to_preamble (char *str)
{
    size_t toklen;

    if (packet_preamble_len != 0) {
        if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
            return; /* no room to add more preamble */
        /* Add a blank separator between the previous token and this token. */
        packet_preamble[packet_preamble_len++] = ' ';
    }
    toklen = strlen(str);
    if (toklen != 0) {
        if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
            return; /* no room to add the token to the preamble */
        g_strlcpy(&packet_preamble[packet_preamble_len], str, PACKET_PREAMBLE_MAX_LEN);
        packet_preamble_len += (int) toklen;
        if (debug >= 2) {
            char *c;
            char xs[PACKET_PREAMBLE_MAX_LEN];
            g_strlcpy(xs, packet_preamble, PACKET_PREAMBLE_MAX_LEN);
            while ((c = strchr(xs, '\r')) != NULL) *c=' ';
            fprintf (stderr, "[[append_to_preamble: \"%s\"]]", xs);
        }
    }
}

/*----------------------------------------------------------------------
 * Parse the preamble to get the timecode.
 */

static void
parse_preamble (void)
{
    struct tm  timecode;
    char      *subsecs;
    char      *p;
    int        subseclen;
    int        i;

     /*
     * Null-terminate the preamble.
     */
    packet_preamble[packet_preamble_len] = '\0';
    if (debug > 0)
        fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);

    if (has_direction) {
        switch (packet_preamble[0]) {
        case 'i':
        case 'I':
            direction = 0x00000001;
            packet_preamble[0] = ' ';
            break;
        case 'o':
        case 'O':
            direction = 0x00000002;
            packet_preamble[0] = ' ';
            break;
        default:
            direction = 0x00000000;
            break;
        }
        i = 0;
        while (packet_preamble[i] == ' ' ||
               packet_preamble[i] == '\r' ||
               packet_preamble[i] == '\t') {
            i++;
        }
        packet_preamble_len -= i;
        /* Also move the trailing '\0'. */
        memmove(packet_preamble, packet_preamble + i, packet_preamble_len + 1);
    }


    /*
     * If no "-t" flag was specified, don't attempt to parse the packet
     * preamble to extract a time stamp.
     */
    if (ts_fmt == NULL) {
        /* Clear Preamble */
        packet_preamble_len = 0;
        return;
    }

    /*
     * Initialize to today localtime, just in case not all fields
     * of the date and time are specified.
     */

    timecode = timecode_default;
    ts_nsec = 0;

    /* Ensure preamble has more than two chars before attempting to parse.
     * This should cover line breaks etc that get counted.
     */
    if (strlen(packet_preamble) > 2) {
        /* Get Time leaving subseconds */
        subsecs = strptime( packet_preamble, ts_fmt, &timecode );
        if (subsecs != NULL) {
            /* Get the long time from the tm structure */
            /*  (will return -1 if failure)            */
            ts_sec  = mktime( &timecode );
        } else
            ts_sec = -1;    /* we failed to parse it */

        /* This will ensure incorrectly parsed dates get set to zero */
        if (-1 == ts_sec) {
            /* Sanitize - remove all '\r' */
            char *c;
            while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
            fprintf (stderr, "Failure processing time \"%s\" using time format \"%s\"\n   (defaulting to Jan 1,1970 00:00:00 GMT)\n",
                 packet_preamble, ts_fmt);
            if (debug >= 2) {
                fprintf(stderr, "timecode: %02d/%02d/%d %02d:%02d:%02d %d\n",
                    timecode.tm_mday, timecode.tm_mon, timecode.tm_year,
                    timecode.tm_hour, timecode.tm_min, timecode.tm_sec, timecode.tm_isdst);
            }
            ts_sec  = 0;  /* Jan 1,1970: 00:00 GMT; tshark/wireshark will display date/time as adjusted by timezone */
            ts_nsec = 0;
        } else {
            /* Parse subseconds */
            ts_nsec = (guint32)strtol(subsecs, &p, 10);
            if (subsecs == p) {
                /* Error */
                ts_nsec = 0;
            } else {
                /*
                 * Convert that number to a number
                 * of microseconds; if it's N digits
                 * long, it's in units of 10^(-N) seconds,
                 * so, to convert it to units of
                 * 10^-9 seconds, we multiply by
                 * 10^(9-N).
                 */
                subseclen = (int) (p - subsecs);
                if (subseclen > 9) {
                    /*
                     * *More* than 9 digits; 9-N is
                     * negative, so we divide by
                     * 10^(N-9).
                     */
                    for (i = subseclen - 9; i != 0; i--)
                        ts_nsec /= 10;
                } else if (subseclen < 9) {
                    for (i = 9 - subseclen; i != 0; i--)
                        ts_nsec *= 10;
                }
            }
        }
    }
    if (debug >= 2) {
        char *c;
        while ((c = strchr(packet_preamble, '\r')) != NULL) *c=' ';
        fprintf(stderr, "[[parse_preamble: \"%s\"]]\n", packet_preamble);
        fprintf(stderr, "Format(%s), time(%u), subsecs(%u)\n", ts_fmt, (guint32)ts_sec, ts_nsec);
    }


    /* Clear Preamble */
    packet_preamble_len = 0;
}

/*----------------------------------------------------------------------
 * Start a new packet
 */
static void
start_new_packet (gboolean cont)
{
    if (debug >= 1)
        fprintf(stderr, "Start new packet (cont = %s).\n", cont ? "TRUE" : "FALSE");

    /* Write out the current packet, if required */
    write_current_packet(cont);
    num_packets_read++;

    /* Ensure we parse the packet preamble as it may contain the time */
    parse_preamble();
}

/*----------------------------------------------------------------------
 * Process a directive
 */
static void
process_directive (char *str)
{
    fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str + 10);
}

/*----------------------------------------------------------------------
 * Parse a single token (called from the scanner)
 */
void
parse_token (token_t token, char *str)
{
    guint32  num;
    int      by_eol;
    int      rollback = 0;
    int      line_size;
    int      i;
    char    *s2;
    char     tmp_str[3];

    /*
     * This is implemented as a simple state machine of five states.
     * State transitions are caused by tokens being received from the
     * scanner. The code should be self-documenting.
     */

    if (debug >= 2) {
        /* Sanitize - remove all '\r' */
        char *c;
        if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }

        fprintf(stderr, "(%s, %s \"%s\") -> (",
                state_str[state], token_str[token], str ? str : "");
    }

    switch (state) {

    /* ----- Waiting for new packet -------------------------------------------*/
    case INIT:
        if (!str && token != T_EOL) goto fail_null_str;
        switch (token) {
        case T_TEXT:
            append_to_preamble(str);
            break;
        case T_DIRECTIVE:
            process_directive(str);
            break;
        case T_OFFSET:
            num = parse_num(str, TRUE);
            if (num == 0) {
                /* New packet starts here */
                start_new_packet(FALSE);
                state = READ_OFFSET;
                pkt_lnstart = packet_buf + num;
            }
            break;
        case T_EOL:
            /* Some describing text may be parsed as offset, but the invalid
               offset will be checked in the state of START_OF_LINE, so
               we add this transition to gain flexibility */
            state = START_OF_LINE;
            break;
        default:
            break;
        }
        break;

    /* ----- Processing packet, start of new line -----------------------------*/
    case START_OF_LINE:
        if (!str && token != T_EOL) goto fail_null_str;
        switch (token) {
        case T_TEXT:
            append_to_preamble(str);
            break;
        case T_DIRECTIVE:
            process_directive(str);
            break;
        case T_OFFSET:
            num = parse_num(str, TRUE);
            if (num == 0) {
                /* New packet starts here */
                start_new_packet(FALSE);
                packet_start = 0;
                state = READ_OFFSET;
            } else if ((num - packet_start) != curr_offset - header_length) {
                /*
                 * The offset we read isn't the one we expected.
                 * This may only mean that we mistakenly interpreted
                 * some text as byte values (e.g., if the text dump
                 * of packet data included a number with spaces around
                 * it).  If the offset is less than what we expected,
                 * assume that's the problem, and throw away the putative
                 * extra byte values.
                 */
                if (num < curr_offset) {
                    unwrite_bytes(curr_offset - num);
                    state = READ_OFFSET;
                } else {
                    /* Bad offset; switch to INIT state */
                    if (debug >= 1)
                        fprintf(stderr, "Inconsistent offset. Expecting %0X, got %0X. Ignoring rest of packet\n",
                                curr_offset, num);
                    write_current_packet(FALSE);
                    state = INIT;
                }
            } else {
                state = READ_OFFSET;
            }
            pkt_lnstart = packet_buf + num;
            break;
        case T_EOL:
            state = START_OF_LINE;
            break;
        default:
            break;
        }
        break;

    /* ----- Processing packet, read offset -----------------------------------*/
    case READ_OFFSET:
        switch (token) {
        case T_BYTE:
            /* Record the byte */
            state = READ_BYTE;
            if (!str) goto fail_null_str;
            write_byte(str);
            break;
        case T_TEXT:
        case T_DIRECTIVE:
        case T_OFFSET:
            state = READ_TEXT;
            break;
        case T_EOL:
            state = START_OF_LINE;
            break;
        default:
            break;
        }
        break;

    /* ----- Processing packet, read byte -------------------------------------*/
    case READ_BYTE:
        switch (token) {
        case T_BYTE:
            /* Record the byte */
            write_byte(str);
            break;
        case T_TEXT:
        case T_DIRECTIVE:
        case T_OFFSET:
        case T_EOL:
            by_eol = 0;
            state = READ_TEXT;
            if (token == T_EOL) {
                by_eol = 1;
                state = START_OF_LINE;
            }
            if (identify_ascii) {
                /* Here a line of pkt bytes reading is finished
                   compare the ascii and hex to avoid such situation:
                   "61 62 20 ab ", when ab is ascii dump then it should
                   not be treat as byte */
                rollback = 0;
                /* s2 is the ASCII string, s1 is the HEX string, e.g, when
                   s2 = "ab ", s1 = "616220"
                   we should find out the largest tail of s1 matches the head
                   of s2, it means the matched part in tail is the ASCII dump
                   of the head byte. These matched should be rollback */
                line_size = curr_offset-(int)(pkt_lnstart-packet_buf);
                s2 = (char*)g_malloc((line_size+1)/4+1);
                /* gather the possible pattern */
                for (i = 0; i < (line_size+1)/4; i++) {
                    tmp_str[0] = pkt_lnstart[i*3];
                    tmp_str[1] = pkt_lnstart[i*3+1];
                    tmp_str[2] = '\0';
                    /* it is a valid convertable string */
                    if (!g_ascii_isxdigit(tmp_str[0]) || !g_ascii_isxdigit(tmp_str[1])) {
                        break;
                    }
                    s2[i] = (char)strtoul(tmp_str, (char **)NULL, 16);
                    rollback++;
                    /* the 3rd entry is not a delimiter, so the possible byte pattern will not shown */
                    if (!(pkt_lnstart[i*3+2] == ' ')) {
                        if (by_eol != 1)
                            rollback--;
                        break;
                    }
                }
                /* If packet line start contains possible byte pattern, the line end
                   should contain the matched pattern if the user open the -a flag.
                   The packet will be possible invalid if the byte pattern cannot find
                   a matched one in the line of packet buffer.*/
                if (rollback > 0) {
                    if (strncmp(pkt_lnstart+line_size-rollback, s2, rollback) == 0) {
                        unwrite_bytes(rollback);
                    }
                    /* Not matched. This line contains invalid packet bytes, so
                       discard the whole line */
                    else {
                        unwrite_bytes(line_size);
                    }
                }
                g_free(s2);
            }
            break;
        default:
            break;
        }
        break;

    /* ----- Processing packet, read text -------------------------------------*/
    case READ_TEXT:
        switch (token) {
        case T_EOL:
            state = START_OF_LINE;
            break;
        default:
            break;
        }
        break;

    default:
        fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
        exit(1);
    }

    if (debug >= 2)
        fprintf(stderr, ", %s)\n", state_str[state]);

    return;

fail_null_str:
    fprintf(stderr, "FATAL ERROR: got NULL str pointer in state (%d)", state);
    exit(1);

}

/*----------------------------------------------------------------------
 * Print usage string and exit
 */
static void
print_usage (FILE *output)
{
    fprintf(output,
            "\n"
            "Usage: text2pcap [options] <infile> <outfile>\n"
            "\n"
            "where  <infile> specifies input  filename (use - for standard input)\n"
            "      <outfile> specifies output filename (use - for standard output)\n"
            "\n"
            "Input:\n"
            "  -o hex|oct|dec         parse offsets as (h)ex, (o)ctal or (d)ecimal;\n"
            "                         default is hex.\n"
            "  -t <timefmt>           treat the text before the packet as a date/time code;\n"
            "                         the specified argument is a format string of the sort\n"
            "                         supported by strptime.\n"
            "                         Example: The time \"10:15:14.5476\" has the format code\n"
            "                         \"%%H:%%M:%%S.\"\n"
            "                         NOTE: The subsecond component delimiter, '.', must be\n"
            "                         given, but no pattern is required; the remaining\n"
            "                         number is assumed to be fractions of a second.\n"
            "                         NOTE: Date/time fields from the current date/time are\n"
            "                         used as the default for unspecified fields.\n"
            "  -D                     the text before the packet starts with an I or an O,\n"
            "                         indicating that the packet is inbound or outbound.\n"
            "                         This is only stored if the output format is PCAP-NG.\n"
            "  -a                     enable ASCII text dump identification.\n"
            "                         The start of the ASCII text dump can be identified\n"
            "                         and excluded from the packet data, even if it looks\n"
            "                         like a HEX dump.\n"
            "                         NOTE: Do not enable it if the input file does not\n"
            "                         contain the ASCII text dump.\n"
            "\n"
            "Output:\n"
            "  -l <typenum>           link-layer type number; default is 1 (Ethernet).  See\n"
            "                         http://www.tcpdump.org/linktypes.html for a list of\n"
            "                         numbers.  Use this option if your dump is a complete\n"
            "                         hex dump of an encapsulated packet and you wish to\n"
            "                         specify the exact type of encapsulation.\n"
            "                         Example: -l 7 for ARCNet packets.\n"
            "  -m <max-packet>        max packet length in output; default is %d\n"
            "\n"
            "Prepend dummy header:\n"
            "  -e <l3pid>             prepend dummy Ethernet II header with specified L3PID\n"
            "                         (in HEX).\n"
            "                         Example: -e 0x806 to specify an ARP packet.\n"
            "  -i <proto>             prepend dummy IP header with specified IP protocol\n"
            "                         (in DECIMAL).\n"
            "                         Automatically prepends Ethernet header as well.\n"
            "                         Example: -i 46\n"
            "  -4 <srcip>,<destip>    prepend dummy IPv4 header with specified\n"
            "                         dest and source address.\n"
            "                         Example: -4 10.0.0.1,10.0.0.2\n"
            "  -6 <srcip>,<destip>    replace IPv6 header with specified\n"
            "                         dest and source address.\n"
            "                         Example: -6 fe80:0:0:0:202:b3ff:fe1e:8329,2001:0db8:85a3:0000:0000:8a2e:0370:7334\n"
            "  -u <srcp>,<destp>      prepend dummy UDP header with specified\n"
            "                         source and destination ports (in DECIMAL).\n"
            "                         Automatically prepends Ethernet & IP headers as well.\n"
            "                         Example: -u 1000,69 to make the packets look like\n"
            "                         TFTP/UDP packets.\n"
            "  -T <srcp>,<destp>      prepend dummy TCP header with specified\n"
            "                         source and destination ports (in DECIMAL).\n"
            "                         Automatically prepends Ethernet & IP headers as well.\n"
            "                         Example: -T 50,60\n"
            "  -s <srcp>,<dstp>,<tag> prepend dummy SCTP header with specified\n"
            "                         source/dest ports and verification tag (in DECIMAL).\n"
            "                         Automatically prepends Ethernet & IP headers as well.\n"
            "                         Example: -s 30,40,34\n"
            "  -S <srcp>,<dstp>,<ppi> prepend dummy SCTP header with specified\n"
            "                         source/dest ports and verification tag 0.\n"
            "                         Automatically prepends a dummy SCTP DATA\n"
            "                         chunk header with payload protocol identifier ppi.\n"
            "                         Example: -S 30,40,34\n"
            "\n"
            "Miscellaneous:\n"
            "  -h                     display this help and exit.\n"
            "  -d                     show detailed debug of parser states.\n"
            "  -q                     generate no output at all (automatically disables -d).\n"
            "  -n                     use PCAP-NG instead of PCAP as output format.\n"
            "",
            MAX_PACKET);
}

static void
get_text2pcap_compiled_info(GString *str)
{
    /* LIBZ */
    g_string_append(str, ", ");
#ifdef HAVE_LIBZ
    g_string_append(str, "with libz ");
#ifdef ZLIB_VERSION
    g_string_append(str, ZLIB_VERSION);
#else /* ZLIB_VERSION */
    g_string_append(str, "(version unknown)");
#endif /* ZLIB_VERSION */
#else /* HAVE_LIBZ */
    g_string_append(str, "without libz");
#endif /* HAVE_LIBZ */
}

static void
get_text2pcap_runtime_info(GString *str)
{
    /* zlib */
#if defined(HAVE_LIBZ) && !defined(_WIN32)
    g_string_append_printf(str, ", with libz %s", zlibVersion());
#endif
}

/*----------------------------------------------------------------------
 * Parse CLI options
 */
static void
parse_options (int argc, char *argv[])
{
    GString *comp_info_str;
    GString *runtime_info_str;
    int   c;
    char *p;
    static const struct option long_options[] = {
        {"help", no_argument, NULL, 'h'},
        {"version", no_argument, NULL, 'v'},
        {0, 0, 0, 0 }
    };

#ifdef _WIN32
    arg_list_utf_16to8(argc, argv);
    create_app_running_mutex();
#endif /* _WIN32 */

    /* Get the compile-time version information string */
    comp_info_str = get_compiled_version_info(NULL, get_text2pcap_compiled_info);

    /* get the run-time version information string */
    runtime_info_str = get_runtime_version_info(get_text2pcap_runtime_info);

    /* Add it to the information to be reported on a crash. */
    ws_add_crash_info("Text2pcap (Wireshark) %s\n"
         "\n"
         "%s"
         "\n"
         "%s",
      get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);

    /* Scan CLI parameters */
    while ((c = getopt_long(argc, argv, "aDdhqe:i:l:m:no:u:s:S:t:T:v4:6:", long_options, NULL)) != -1) {
        switch (c) {
        case 'h':
            printf("Text2pcap (Wireshark) %s\n"
                   "Generate a capture file from an ASCII hexdump of packets.\n"
                   "See https://www.wireshark.org for more information.\n",
                   get_ws_vcs_version_info());
            print_usage(stdout);
            exit(0);
            break;
        case 'd': if (!quiet) debug++; break;
        case 'D': has_direction = TRUE; break;
        case 'q': quiet = TRUE; debug = FALSE; break;
        case 'l': pcap_link_type = (guint32)strtol(optarg, NULL, 0); break;
        case 'm': max_offset = (guint32)strtol(optarg, NULL, 0); break;
        case 'n': use_pcapng = TRUE; break;
        case 'o':
            if (optarg[0] != 'h' && optarg[0] != 'o' && optarg[0] != 'd') {
                fprintf(stderr, "Bad argument for '-o': %s\n", optarg);
                print_usage(stderr);
                exit(1);
            }
            switch (optarg[0]) {
            case 'o': offset_base =  8; break;
            case 'h': offset_base = 16; break;
            case 'd': offset_base = 10; break;
            }
            break;
        case 'e':
            hdr_ethernet = TRUE;
            if (sscanf(optarg, "%x", &hdr_ethernet_proto) < 1) {
                fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
                print_usage(stderr);
                exit(1);
            }
            break;

        case 'i':
            hdr_ip = TRUE;
            hdr_ip_proto = strtol(optarg, &p, 10);
            if (p == optarg || *p != '\0' || hdr_ip_proto < 0 ||
                  hdr_ip_proto > 255) {
                fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
                print_usage(stderr);
                exit(1);
            }
            hdr_ethernet = TRUE;
            hdr_ethernet_proto = 0x800;
            break;

        case 's':
            hdr_sctp = TRUE;
            hdr_data_chunk = FALSE;
            hdr_tcp = FALSE;
            hdr_udp = FALSE;
            hdr_sctp_src   = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad src port for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No dest port specified for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_sctp_dest = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad dest port for '-s'\n");
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No tag specified for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_sctp_tag = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || *p != '\0') {
                fprintf(stderr, "Bad tag for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }

            hdr_ip = TRUE;
            hdr_ip_proto = 132;
            hdr_ethernet = TRUE;
            hdr_ethernet_proto = 0x800;
            break;
        case 'S':
            hdr_sctp = TRUE;
            hdr_data_chunk = TRUE;
            hdr_tcp = FALSE;
            hdr_udp = FALSE;
            hdr_sctp_src   = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad src port for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No dest port specified for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_sctp_dest = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad dest port for '-s'\n");
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No ppi specified for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_data_chunk_ppid = (guint32)strtoul(optarg, &p, 10);
            if (p == optarg || *p != '\0') {
                fprintf(stderr, "Bad ppi for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }

            hdr_ip = TRUE;
            hdr_ip_proto = 132;
            hdr_ethernet = TRUE;
            hdr_ethernet_proto = 0x800;
            break;

        case 't':
            ts_fmt = optarg;
            break;

        case 'u':
            hdr_udp = TRUE;
            hdr_tcp = FALSE;
            hdr_sctp = FALSE;
            hdr_data_chunk = FALSE;
            hdr_src_port = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad src port for '-u'\n");
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No dest port specified for '-u'\n");
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_dest_port = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || *p != '\0') {
                fprintf(stderr, "Bad dest port for '-u'\n");
                print_usage(stderr);
                exit(1);
            }
            hdr_ip = TRUE;
            hdr_ip_proto = 17;
            hdr_ethernet = TRUE;
            hdr_ethernet_proto = 0x800;
            break;

        case 'T':
            hdr_tcp = TRUE;
            hdr_udp = FALSE;
            hdr_sctp = FALSE;
            hdr_data_chunk = FALSE;
            hdr_src_port = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || (*p != ',' && *p != '\0')) {
                fprintf(stderr, "Bad src port for '-T'\n");
                print_usage(stderr);
                exit(1);
            }
            if (*p == '\0') {
                fprintf(stderr, "No dest port specified for '-u'\n");
                print_usage(stderr);
                exit(1);
            }
            p++;
            optarg = p;
            hdr_dest_port = (guint32)strtol(optarg, &p, 10);
            if (p == optarg || *p != '\0') {
                fprintf(stderr, "Bad dest port for '-T'\n");
                print_usage(stderr);
                exit(1);
            }
            hdr_ip = TRUE;
            hdr_ip_proto = 6;
            hdr_ethernet = TRUE;
            hdr_ethernet_proto = 0x800;
            break;

        case 'a':
            identify_ascii = TRUE;
            break;

        case 'v':
            show_version("Text2pcap (Wireshark)", comp_info_str, runtime_info_str);
            g_string_free(comp_info_str, TRUE);
            g_string_free(runtime_info_str, TRUE);
            exit(0);
            break;

        case '4':
        case '6':
            p = strchr(optarg, ',');

            if (!p) {
                fprintf(stderr, "Bad source param addr for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }

            *p = '\0';
            if (c == '6')
            {
                hdr_ipv6 = TRUE;
                hdr_ethernet_proto = 0x86DD;
            }
            else
            {
                hdr_ip = TRUE;
                hdr_ethernet_proto = 0x800;
            }
            hdr_ethernet = TRUE;

            if (hdr_ipv6 == TRUE) {
                if (inet_pton( AF_INET6, optarg, hdr_ipv6_src_addr) <= 0) {
                        fprintf(stderr, "Bad src addr -%c '%s'\n", c, p);
                        print_usage(stderr);
                        exit(1);
                }
            } else {
                if (inet_pton( AF_INET, optarg, &hdr_ip_src_addr) <= 0) {
                        fprintf(stderr, "Bad src addr -%c '%s'\n", c, p);
                        print_usage(stderr);
                        exit(1);
                }
            }

            p++;
            if (*p == '\0') {
                fprintf(stderr, "No dest addr specified for '-%c'\n", c);
                print_usage(stderr);
                exit(1);
            }

            if (hdr_ipv6 == TRUE) {
                if (inet_pton( AF_INET6, p, hdr_ipv6_dest_addr) <= 0) {
                        fprintf(stderr, "Bad dest addr for -%c '%s'\n", c, p);
                        print_usage(stderr);
                        exit(1);
                }
            } else {
                if (inet_pton( AF_INET, p, &hdr_ip_dest_addr) <= 0) {
                        fprintf(stderr, "Bad dest addr for -%c '%s'\n", c, p);
                        print_usage(stderr);
                        exit(1);
                }
            }
            break;


        case '?':
        default:
            print_usage(stderr);
            exit(1);
        }
    }

    if (optind >= argc || argc-optind < 2) {
        fprintf(stderr, "Must specify input and output filename\n");
        print_usage(stderr);
        exit(1);
    }

    if (strcmp(argv[optind], "-")) {
        input_filename = g_strdup(argv[optind]);
        input_file = ws_fopen(input_filename, "rb");
        if (!input_file) {
            fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
                    input_filename, g_strerror(errno));
            exit(1);
        }
    } else {
        input_filename = "Standard input";
        input_file = stdin;
    }

    if (strcmp(argv[optind+1], "-")) {
        output_filename = g_strdup(argv[optind+1]);
        output_file = ws_fopen(output_filename, "wb");
        if (!output_file) {
            fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
                    output_filename, g_strerror(errno));
            exit(1);
        }
    } else {
        output_filename = "Standard output";
        output_file = stdout;
    }

    /* Some validation */
    if (pcap_link_type != 1 && hdr_ethernet) {
        fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S -T) cannot be specified with link type override (-l)\n");
        exit(1);
    }

    /* Set up our variables */
    if (!input_file) {
        input_file = stdin;
        input_filename = "Standard input";
    }
    if (!output_file) {
        output_file = stdout;
        output_filename = "Standard output";
    }

    ts_sec = time(0);               /* initialize to current time */
    timecode_default = *localtime(&ts_sec);
    timecode_default.tm_isdst = -1; /* Unknown for now, depends on time given to the strptime() function */

    /* Display summary of our state */
    if (!quiet) {
        fprintf(stderr, "Input from: %s\n", input_filename);
        fprintf(stderr, "Output to: %s\n",  output_filename);
        fprintf(stderr, "Output format: %s\n", use_pcapng ? "PCAP-NG" : "PCAP");

        if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0X\n",
                                  hdr_ethernet_proto);
        if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
                            hdr_ip_proto);
        if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %u. Dest port: %u\n",
                             hdr_src_port, hdr_dest_port);
        if (hdr_tcp) fprintf(stderr, "Generate dummy TCP header: Source port: %u. Dest port: %u\n",
                             hdr_src_port, hdr_dest_port);
        if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %u. Dest port: %u. Tag: %u\n",
                              hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
        if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %u. SID: %u. SSN: %u. PPID: %u\n",
                                    hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
    }
}

int
main(int argc, char *argv[])
{
    parse_options(argc, argv);

    assert(input_file  != NULL);
    assert(output_file != NULL);

    write_file_header();

    header_length = 0;
    if (hdr_ethernet) {
        header_length += (int)sizeof(HDR_ETHERNET);
    }
    if (hdr_ip) {
        ip_offset = header_length;
        header_length += (int)sizeof(HDR_IP);
    } else if (hdr_ipv6) {
        ip_offset = header_length;
        header_length += (int)sizeof(HDR_IPv6);
    }
    if (hdr_sctp) {
        header_length += (int)sizeof(HDR_SCTP);
    }
    if (hdr_data_chunk) {
        header_length += (int)sizeof(HDR_DATA_CHUNK);
    }
    if (hdr_tcp) {
        header_length += (int)sizeof(HDR_TCP);
    }
    if (hdr_udp) {
        header_length += (int)sizeof(HDR_UDP);
    }
    curr_offset = header_length;

    yyin = input_file;
    yylex();

    write_current_packet(FALSE);
    fclose(input_file);
    fclose(output_file);
    if (debug)
        fprintf(stderr, "\n-------------------------\n");
    if (!quiet) {
        fprintf(stderr, "Read %u potential packet%s, wrote %u packet%s (%" G_GINT64_MODIFIER "u byte%s).\n",
                num_packets_read, (num_packets_read == 1) ? "" : "s",
                num_packets_written, (num_packets_written == 1) ? "" : "s",
                bytes_written, (bytes_written == 1) ? "" : "s");
    }
    return 0;
}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */