forked from wireshark/wireshark
-
Notifications
You must be signed in to change notification settings - Fork 0
/
editcap.c
2228 lines (1941 loc) · 80.3 KB
/
editcap.c
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
/* editcap.c
* Edit capture files. We can delete packets, adjust timestamps, or
* simply convert from one format to another format.
*
* Originally written by Richard Sharpe.
* Improved by Guy Harris.
* Further improved by Richard Sharpe.
*
* Copyright 2013, Richard Sharpe <realrichardsharpe[AT]gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.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
#include <time.h>
#include <glib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <wiretap/secrets-types.h>
#include <wiretap/wtap.h>
#include "epan/etypes.h"
#include "epan/dissectors/packet-ieee80211-radiotap-defs.h"
#ifndef HAVE_GETOPT_LONG
#include "wsutil/wsgetopt.h"
#endif
#ifdef _WIN32
#include <process.h> /* getpid */
#include <winsock2.h>
#endif
#ifndef HAVE_STRPTIME
# include "wsutil/strptime.h"
#endif
#include <ui/clopts_common.h>
#include <ui/cmdarg_err.h>
#include <wsutil/filesystem.h>
#include <wsutil/file_util.h>
#include <wsutil/wsgcrypt.h>
#include <wsutil/plugins.h>
#include <wsutil/privileges.h>
#include <wsutil/report_message.h>
#include <wsutil/strnatcmp.h>
#include <wsutil/str_util.h>
#include <cli_main.h>
#include <version_info.h>
#include <wsutil/pint.h>
#include <wsutil/strtoi.h>
#include <wiretap/wtap_opttypes.h>
#include <wiretap/pcapng.h>
#include "ui/failure_message.h"
#include "ringbuffer.h" /* For RINGBUFFER_MAX_NUM_FILES */
#define INVALID_OPTION 1
#define INVALID_FILE 2
#define CANT_EXTRACT_PREFIX 2
#define WRITE_ERROR 2
#define DUMP_ERROR 2
/*
* Some globals so we can pass things to various routines
*/
struct select_item {
gboolean inclusive;
guint first, second;
};
/*
* Duplicate frame detection
*/
typedef struct _fd_hash_t {
guint8 digest[16];
guint32 len;
nstime_t frame_time;
} fd_hash_t;
#define DEFAULT_DUP_DEPTH 5 /* Used with -d */
#define MAX_DUP_DEPTH 1000000 /* the maximum window (and actual size of fd_hash[]) for de-duplication */
static fd_hash_t fd_hash[MAX_DUP_DEPTH];
static int dup_window = DEFAULT_DUP_DEPTH;
static int cur_dup_entry = 0;
static guint32 ignored_bytes = 0; /* Used with -I */
#define ONE_BILLION 1000000000
/* Weights of different errors we can introduce */
/* We should probably make these command-line arguments */
/* XXX - Should we add a bit-level error? */
#define ERR_WT_BIT 5 /* Flip a random bit */
#define ERR_WT_BYTE 5 /* Substitute a random byte */
#define ERR_WT_ALNUM 5 /* Substitute a random character in [A-Za-z0-9] */
#define ERR_WT_FMT 2 /* Substitute "%s" */
#define ERR_WT_AA 1 /* Fill the remainder of the buffer with 0xAA */
#define ERR_WT_TOTAL (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
#define ALNUM_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
#define ALNUM_LEN (sizeof(ALNUM_CHARS) - 1)
struct time_adjustment {
nstime_t tv;
int is_negative;
};
typedef struct _chop_t {
int len_begin;
int off_begin_pos;
int off_begin_neg;
int len_end;
int off_end_pos;
int off_end_neg;
} chop_t;
/* Table of user comments */
GTree *frames_user_comments = NULL;
#define MAX_SELECTIONS 512
static struct select_item selectfrm[MAX_SELECTIONS];
static guint max_selected = 0;
static int keep_em = 0;
#ifdef PCAP_NG_DEFAULT
static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAPNG; /* default to pcapng */
#else
static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAP; /* default to pcap */
#endif
static int out_frame_type = -2; /* Leave frame type alone */
static int verbose = 0; /* Not so verbose */
static struct time_adjustment time_adj = {NSTIME_INIT_ZERO, 0}; /* no adjustment */
static nstime_t relative_time_window = NSTIME_INIT_ZERO; /* de-dup time window */
static double err_prob = -1.0;
static time_t starttime = 0;
static time_t stoptime = 0;
static gboolean check_startstop = FALSE;
static gboolean rem_vlan = FALSE;
static gboolean dup_detect = FALSE;
static gboolean dup_detect_by_time = FALSE;
static gboolean skip_radiotap = FALSE;
static gboolean remove_all_secrets = FALSE;
static int do_strict_time_adjustment = FALSE;
static struct time_adjustment strict_time_adj = {NSTIME_INIT_ZERO, 0}; /* strict time adjustment */
static nstime_t previous_time = NSTIME_INIT_ZERO; /* previous time */
static const struct {
const char *str;
guint32 id;
} secrets_types[] = {
{ "tls", SECRETS_TYPE_TLS },
};
static int find_dct2000_real_data(guint8 *buf);
static void handle_chopping(chop_t chop, wtap_packet_header *out_phdr,
const wtap_packet_header *in_phdr, guint8 **buf,
gboolean adjlen);
static gchar *
abs_time_to_str_with_sec_resolution(const nstime_t *abs_time)
{
struct tm *tmp;
gchar *buf = (gchar *)g_malloc(16);
tmp = localtime(&abs_time->secs);
if (tmp) {
g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
tmp->tm_year + 1900,
tmp->tm_mon+1,
tmp->tm_mday,
tmp->tm_hour,
tmp->tm_min,
tmp->tm_sec);
} else {
buf[0] = '\0';
}
return buf;
}
static gchar *
fileset_get_filename_by_pattern(guint idx, const wtap_rec *rec,
gchar *fprefix, gchar *fsuffix)
{
gchar filenum[5+1];
gchar *timestr;
gchar *abs_str;
g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
if (rec->presence_flags & WTAP_HAS_TS) {
timestr = abs_time_to_str_with_sec_resolution(&rec->ts);
abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
g_free(timestr);
} else
abs_str = g_strconcat(fprefix, "_", filenum, fsuffix, NULL);
return abs_str;
}
static gboolean
fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
{
char *pfx, *last_pathsep;
gchar *save_file;
save_file = g_strdup(fname);
if (save_file == NULL) {
fprintf(stderr, "editcap: Out of memory\n");
return FALSE;
}
last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
pfx = strrchr(save_file,'.');
if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
/* The pathname has a "." in it, and it's in the last component
* of the pathname (because there is either only one component,
* i.e. last_pathsep is null as there are no path separators,
* or the "." is after the path separator before the last
* component.
* Treat it as a separator between the rest of the file name and
* the file name suffix, and arrange that the names given to the
* ring buffer files have the specified suffix, i.e. put the
* changing part of the name *before* the suffix. */
pfx[0] = '\0';
*fprefix = g_strdup(save_file);
pfx[0] = '.'; /* restore capfile_name */
*fsuffix = g_strdup(pfx);
} else {
/* Either there's no "." in the pathname, or it's in a directory
* component, so the last component has no suffix. */
*fprefix = g_strdup(save_file);
*fsuffix = NULL;
}
g_free(save_file);
return TRUE;
}
/* Add a selection item, a simple parser for now */
static gboolean
add_selection(char *sel, guint* max_selection)
{
char *locn;
char *next;
if (max_selected >= MAX_SELECTIONS) {
/* Let the user know we stopped selecting */
fprintf(stderr, "Out of room for packet selections.\n");
return(FALSE);
}
if (verbose)
fprintf(stderr, "Add_Selected: %s\n", sel);
if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
if (verbose)
fprintf(stderr, "Not inclusive ...");
selectfrm[max_selected].inclusive = FALSE;
selectfrm[max_selected].first = get_guint32(sel, "packet number");
if (selectfrm[max_selected].first > *max_selection)
*max_selection = selectfrm[max_selected].first;
if (verbose)
fprintf(stderr, " %u\n", selectfrm[max_selected].first);
} else {
if (verbose)
fprintf(stderr, "Inclusive ...");
*locn = '\0'; /* split the range */
next = locn + 1;
selectfrm[max_selected].inclusive = TRUE;
selectfrm[max_selected].first = get_guint32(sel, "beginning of packet range");
selectfrm[max_selected].second = get_guint32(next, "end of packet range");
if (selectfrm[max_selected].second == 0)
{
/* Not a valid number, presume all */
selectfrm[max_selected].second = *max_selection = G_MAXUINT;
}
else if (selectfrm[max_selected].second > *max_selection)
*max_selection = selectfrm[max_selected].second;
if (verbose)
fprintf(stderr, " %u, %u\n", selectfrm[max_selected].first,
selectfrm[max_selected].second);
}
max_selected++;
return(TRUE);
}
/* Was the packet selected? */
static int
selected(guint recno)
{
guint i;
for (i = 0; i < max_selected; i++) {
if (selectfrm[i].inclusive) {
if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
return 1;
} else {
if (recno == selectfrm[i].first)
return 1;
}
}
return 0;
}
static gboolean
set_time_adjustment(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/* check for a negative adjustment */
if (*optarg_str_p == '-') {
time_adj.is_negative = 1;
optarg_str_p++;
}
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
}
time_adj.tv.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val >= ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
time_adj.tv.nsecs = (int)val;
return TRUE;
}
static gboolean
set_strict_time_adj(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/*
* check for a negative adjustment
* A negative strict adjustment value is a flag
* to adjust all frames by the specifed delta time.
*/
if (*optarg_str_p == '-') {
strict_time_adj.is_negative = 1;
optarg_str_p++;
}
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
}
strict_time_adj.tv.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val >= ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
strict_time_adj.tv.nsecs = (int)val;
return TRUE;
}
static gboolean
set_rel_time(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/* ignore negative adjustment */
if (*optarg_str_p == '-')
optarg_str_p++;
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
}
relative_time_window.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val >= ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
relative_time_window.nsecs = (int)val;
return TRUE;
}
#define LINUX_SLL_OFFSETP 14
#define VLAN_SIZE 4
static void
sll_remove_vlan_info(guint8* fd, guint32* len) {
if (pntoh16(fd + LINUX_SLL_OFFSETP) == ETHERTYPE_VLAN) {
int rest_len;
/* point to start of vlan */
fd = fd + LINUX_SLL_OFFSETP;
/* bytes to read after vlan info */
rest_len = *len - (LINUX_SLL_OFFSETP + VLAN_SIZE);
/* remove vlan info from packet */
memmove(fd, fd + VLAN_SIZE, rest_len);
*len -= 4;
}
}
static void
remove_vlan_info(const wtap_packet_header *phdr, guint8* fd, guint32* len) {
switch (phdr->pkt_encap) {
case WTAP_ENCAP_SLL:
sll_remove_vlan_info(fd, len);
break;
default:
/* no support for current pkt_encap */
break;
}
}
static gboolean
is_duplicate(guint8* fd, guint32 len) {
int i;
const struct ieee80211_radiotap_header* tap_header;
/*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
guint32 offset = ignored_bytes;
guint32 new_len;
guint8 *new_fd;
if (len <= ignored_bytes) {
offset = 0;
}
/* Get the size of radiotap header and use that as offset (-p option) */
if (skip_radiotap == TRUE) {
tap_header = (const struct ieee80211_radiotap_header*)fd;
offset = pletoh16(&tap_header->it_len);
if (offset >= len)
offset = 0;
}
new_fd = &fd[offset];
new_len = len - (offset);
cur_dup_entry++;
if (cur_dup_entry >= dup_window)
cur_dup_entry = 0;
/* Calculate our digest */
gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
fd_hash[cur_dup_entry].len = len;
/* Look for duplicates */
for (i = 0; i < dup_window; i++) {
if (i == cur_dup_entry)
continue;
if (fd_hash[i].len == fd_hash[cur_dup_entry].len
&& memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
return TRUE;
}
}
return FALSE;
}
static gboolean
is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
int i;
/*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
guint32 offset = ignored_bytes;
guint32 new_len;
guint8 *new_fd;
if (len <= ignored_bytes) {
offset = 0;
}
new_fd = &fd[offset];
new_len = len - (offset);
cur_dup_entry++;
if (cur_dup_entry >= dup_window)
cur_dup_entry = 0;
/* Calculate our digest */
gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
fd_hash[cur_dup_entry].len = len;
fd_hash[cur_dup_entry].frame_time.secs = current->secs;
fd_hash[cur_dup_entry].frame_time.nsecs = current->nsecs;
/*
* Look for relative time related duplicates.
* This is hopefully a reasonably efficient mechanism for
* finding duplicates by rel time in the fd_hash[] cache.
* We check starting from the most recently added hash
* entries and work backwards towards older packets.
* This approach allows the dup test to be terminated
* when the relative time of a cached entry is found to
* be beyond the dup time window.
*
* Of course this assumes that the input trace file is
* "well-formed" in the sense that the packet timestamps are
* in strict chronologically increasing order (which is NOT
* always the case!!).
*
* The fd_hash[] table was deliberately created large (1,000,000).
* Looking for time related duplicates in large trace files with
* non-fractional dup time window values can potentially take
* a long time to complete.
*/
for (i = cur_dup_entry - 1;; i--) {
nstime_t delta;
int cmp;
if (i < 0)
i = dup_window - 1;
if (i == cur_dup_entry) {
/*
* We've decremented back to where we started.
* Check no more!
*/
break;
}
if (nstime_is_unset(&(fd_hash[i].frame_time))) {
/*
* We've decremented to an unused fd_hash[] entry.
* Check no more!
*/
break;
}
nstime_delta(&delta, current, &fd_hash[i].frame_time);
if (delta.secs < 0 || delta.nsecs < 0) {
/*
* A negative delta implies that the current packet
* has an absolute timestamp less than the cached packet
* that it is being compared to. This is NOT a normal
* situation since trace files usually have packets in
* chronological order (oldest to newest).
*
* There are several possible ways to deal with this:
* 1. 'continue' dup checking with the next cached frame.
* 2. 'break' from looking for a duplicate of the current frame.
* 3. Take the absolute value of the delta and see if that
* falls within the specifed dup time window.
*
* Currently this code does option 1. But it would pretty
* easy to add yet-another-editcap-option to select one of
* the other behaviors for dealing with out-of-sequence
* packets.
*/
continue;
}
cmp = nstime_cmp(&delta, &relative_time_window);
if (cmp > 0) {
/*
* The delta time indicates that we are now looking at
* cached packets beyond the specified dup time window.
* Check no more!
*/
break;
} else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
&& memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
return TRUE;
}
}
return FALSE;
}
static void
print_usage(FILE *output)
{
fprintf(output, "\n");
fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
fprintf(output, "\n");
fprintf(output, "<infile> and <outfile> must both be present.\n");
fprintf(output, "A single packet or a range of packets can be selected.\n");
fprintf(output, "\n");
fprintf(output, "Packet selection:\n");
fprintf(output, " -r keep the selected packets; default is to delete them.\n");
fprintf(output, " -A <start time> only output packets whose timestamp is after (or equal\n");
fprintf(output, " to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
fprintf(output, " -B <stop time> only output packets whose timestamp is before the\n");
fprintf(output, " given time (format as YYYY-MM-DD hh:mm:ss).\n");
fprintf(output, "\n");
fprintf(output, "Duplicate packet removal:\n");
fprintf(output, " --novlan remove vlan info from packets before checking for duplicates.\n");
fprintf(output, " -d remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
fprintf(output, " -D <dup window> remove packet if duplicate; configurable <dup window>.\n");
fprintf(output, " Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
fprintf(output, " NOTE: A <dup window> of 0 with -v (verbose option) is\n");
fprintf(output, " useful to print MD5 hashes.\n");
fprintf(output, " -w <dup time window> remove packet if duplicate packet is found EQUAL TO OR\n");
fprintf(output, " LESS THAN <dup time window> prior to current packet.\n");
fprintf(output, " A <dup time window> is specified in relative seconds\n");
fprintf(output, " (e.g. 0.000001).\n");
fprintf(output, " NOTE: The use of the 'Duplicate packet removal' options with\n");
fprintf(output, " other editcap options except -v may not always work as expected.\n");
fprintf(output, " Specifically the -r, -t or -S options will very likely NOT have the\n");
fprintf(output, " desired effect if combined with the -d, -D or -w.\n");
fprintf(output, " --skip-radiotap-header skip radiotap header when checking for packet duplicates.\n");
fprintf(output, " Useful when processing packets captured by multiple radios\n");
fprintf(output, " on the same channel in the vicinity of each other.\n");
fprintf(output, "\n");
fprintf(output, "Packet manipulation:\n");
fprintf(output, " -s <snaplen> truncate each packet to max. <snaplen> bytes of data.\n");
fprintf(output, " -C [offset:]<choplen> chop each packet by <choplen> bytes. Positive values\n");
fprintf(output, " chop at the packet beginning, negative values at the\n");
fprintf(output, " packet end. If an optional offset precedes the length,\n");
fprintf(output, " then the bytes chopped will be offset from that value.\n");
fprintf(output, " Positive offsets are from the packet beginning,\n");
fprintf(output, " negative offsets are from the packet end. You can use\n");
fprintf(output, " this option more than once, allowing up to 2 chopping\n");
fprintf(output, " regions within a packet provided that at least 1\n");
fprintf(output, " choplen is positive and at least 1 is negative.\n");
fprintf(output, " -L adjust the frame (i.e. reported) length when chopping\n");
fprintf(output, " and/or snapping.\n");
fprintf(output, " -t <time adjustment> adjust the timestamp of each packet.\n");
fprintf(output, " <time adjustment> is in relative seconds (e.g. -0.5).\n");
fprintf(output, " -S <strict adjustment> adjust timestamp of packets if necessary to ensure\n");
fprintf(output, " strict chronological increasing order. The <strict\n");
fprintf(output, " adjustment> is specified in relative seconds with\n");
fprintf(output, " values of 0 or 0.000001 being the most reasonable.\n");
fprintf(output, " A negative adjustment value will modify timestamps so\n");
fprintf(output, " that each packet's delta time is the absolute value\n");
fprintf(output, " of the adjustment specified. A value of -0 will set\n");
fprintf(output, " all packets to the timestamp of the first packet.\n");
fprintf(output, " -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
fprintf(output, " a particular packet byte will be randomly changed.\n");
fprintf(output, " -o <change offset> When used in conjunction with -E, skip some bytes from the\n");
fprintf(output, " beginning of the packet. This allows one to preserve some\n");
fprintf(output, " bytes, in order to have some headers untouched.\n");
fprintf(output, " --seed <seed> When used in conjunction with -E, set the seed to use for\n");
fprintf(output, " the pseudo-random number generator. This allows one to\n");
fprintf(output, " repeat a particular sequence of errors.\n");
fprintf(output, " -I <bytes to ignore> ignore the specified number of bytes at the beginning\n");
fprintf(output, " of the frame during MD5 hash calculation, unless the\n");
fprintf(output, " frame is too short, then the full frame is used.\n");
fprintf(output, " Useful to remove duplicated packets taken on\n");
fprintf(output, " several routers (different mac addresses for\n");
fprintf(output, " example).\n");
fprintf(output, " e.g. -I 26 in case of Ether/IP will ignore\n");
fprintf(output, " ether(14) and IP header(20 - 4(src ip) - 4(dst ip)).\n");
fprintf(output, " -a <framenum>:<comment> Add or replace comment for given frame number\n");
fprintf(output, "\n");
fprintf(output, "Output File(s):\n");
fprintf(output, " -c <packets per file> split the packet output to different files based on\n");
fprintf(output, " uniform packet counts with a maximum of\n");
fprintf(output, " <packets per file> each.\n");
fprintf(output, " -i <seconds per file> split the packet output to different files based on\n");
fprintf(output, " uniform time intervals with a maximum of\n");
fprintf(output, " <seconds per file> each.\n");
#ifdef PCAP_NG_DEFAULT
fprintf(output, " -F <capture type> set the output file type; default is pcapng.\n");
#else
fprintf(output, " -F <capture type> set the output file type; default is pcap.\n");
#endif
fprintf(output, " An empty \"-F\" option will list the file types.\n");
fprintf(output, " -T <encap type> set the output file encapsulation type; default is the\n");
fprintf(output, " same as the input file. An empty \"-T\" option will\n");
fprintf(output, " list the encapsulation types.\n");
fprintf(output, " --inject-secrets <type>,<file> Insert decryption secrets from <file>. List\n");
fprintf(output, " supported secret types with \"--inject-secrets help\".\n");
fprintf(output, " --discard-all-secrets Discard all decryption secrets from the input file\n");
fprintf(output, " when writing the output file. Does not discard\n");
fprintf(output, " secrets added by \"--inject-secrets\" in the same\n");
fprintf(output, " command line.\n");
fprintf(output, "\n");
fprintf(output, "Miscellaneous:\n");
fprintf(output, " -h display this help and exit.\n");
fprintf(output, " -v verbose output.\n");
fprintf(output, " If -v is used with any of the 'Duplicate Packet\n");
fprintf(output, " Removal' options (-d, -D or -w) then Packet lengths\n");
fprintf(output, " and MD5 hashes are printed to standard-error.\n");
}
struct string_elem {
const char *sstr; /* The short string */
const char *lstr; /* The long string */
};
static gint
string_compare(gconstpointer a, gconstpointer b)
{
return strcmp(((const struct string_elem *)a)->sstr,
((const struct string_elem *)b)->sstr);
}
static gint
string_nat_compare(gconstpointer a, gconstpointer b)
{
return ws_ascii_strnatcmp(((const struct string_elem *)a)->sstr,
((const struct string_elem *)b)->sstr);
}
static void
string_elem_print(gpointer data, gpointer stream_ptr)
{
fprintf((FILE *) stream_ptr, " %s - %s\n",
((struct string_elem *)data)->sstr,
((struct string_elem *)data)->lstr);
}
static void
list_capture_types(FILE *stream) {
int i;
struct string_elem *captypes;
GSList *list = NULL;
captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES_SUBTYPES);
fprintf(stream, "editcap: The available capture file types for the \"-F\" flag are:\n");
for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
if (wtap_dump_can_open(i)) {
captypes[i].sstr = wtap_file_type_subtype_short_string(i);
captypes[i].lstr = wtap_file_type_subtype_string(i);
list = g_slist_insert_sorted(list, &captypes[i], string_compare);
}
}
g_slist_foreach(list, string_elem_print, stream);
g_slist_free(list);
g_free(captypes);
}
static void
list_encap_types(FILE *stream) {
int i;
struct string_elem *encaps;
GSList *list = NULL;
encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
fprintf(stream, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
encaps[i].sstr = wtap_encap_name(i);
if (encaps[i].sstr != NULL) {
encaps[i].lstr = wtap_encap_description(i);
list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
}
}
g_slist_foreach(list, string_elem_print, stream);
g_slist_free(list);
g_free(encaps);
}
static void
list_secrets_types(FILE *stream)
{
for (guint i = 0; i < G_N_ELEMENTS(secrets_types); i++) {
fprintf(stream, " %s\n", secrets_types[i].str);
}
}
static guint32
lookup_secrets_type(const char *type)
{
for (guint i = 0; i < G_N_ELEMENTS(secrets_types); i++) {
if (!strcmp(secrets_types[i].str, type)) {
return secrets_types[i].id;
}
}
return 0;
}
static void
validate_secrets_file(const char *filename, guint32 secrets_type, const char *data)
{
if (secrets_type == SECRETS_TYPE_TLS) {
/*
* A key log file is unlikely going to look like either:
* - a PEM-encoded private key file.
* - a BER-encoded PKCS #12 file ("PFX file"). (Look for a Constructed
* SEQUENCE tag, e.g. bytes 0x30 which happens to be ASCII '0'.)
*/
if (g_str_has_prefix(data, "-----BEGIN ") || data[0] == 0x30) {
fprintf(stderr,
"editcap: Warning: \"%s\" is not a key log file, but an unsupported private key file. Decryption will not work.\n",
filename);
}
}
}
static int
framenum_compare(gconstpointer a, gconstpointer b, gpointer user_data _U_)
{
if (GPOINTER_TO_UINT(a) < GPOINTER_TO_UINT(b))
return -1;
if (GPOINTER_TO_UINT(a) > GPOINTER_TO_UINT(b))
return 1;
return 0;
}
/*
* General errors and warnings are reported with an console message
* in editcap.
*/
static void
failure_warning_message(const char *msg_format, va_list ap)
{
fprintf(stderr, "editcap: ");
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
/*
* Report additional information for an error in command-line arguments.
*/
static void
failure_message_cont(const char *msg_format, va_list ap)
{
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
static wtap_dumper *
editcap_dump_open(const char *filename, const wtap_dump_params *params,
int *write_err)
{
wtap_dumper *pdh;
if (strcmp(filename, "-") == 0) {
/* Write to the standard output. */
pdh = wtap_dump_open_stdout(out_file_type_subtype, WTAP_UNCOMPRESSED,