1 /* Edit capture files. We can delete packets, adjust timestamps, or
2 * simply convert from one format to another format.
4 * Originally written by Richard Sharpe.
5 * Improved by Guy Harris.
6 * Further improved by Richard Sharpe.
8 * Copyright 2013, Richard Sharpe <realrichardsharpe[AT]gmail.com>
12 * Wireshark - Network traffic analyzer
13 * By Gerald Combs <gerald@wireshark.org>
14 * Copyright 1998 Gerald Combs
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
39 * Just make sure we include the prototype for strptime as well
40 * (needed for glibc 2.2) but make sure we do this only if not
55 #ifdef HAVE_SYS_TIME_H
62 #include "wsutil/wsgetopt.h"
66 #include <wsutil/file_util.h>
67 #include <wsutil/unicode-utils.h>
68 #include <process.h> /* getpid */
69 #ifdef HAVE_WINSOCK2_H
74 #ifdef NEED_STRPTIME_H
75 # include "wsutil/strptime.h"
78 #include <wsutil/privileges.h>
79 #include <wsutil/filesystem.h>
80 #include <wsutil/report_err.h>
81 #include <wsutil/strnatcmp.h>
82 #include <wsutil/md5.h>
83 #include <wsutil/plugins.h>
85 #include "svnversion.h"
87 #include "ringbuffer.h" /* For RINGBUFFER_MAX_NUM_FILES */
90 * Some globals so we can pass things to various routines
99 * Duplicate frame detection
101 typedef struct _fd_hash_t {
102 md5_byte_t digest[16];
107 #define DEFAULT_DUP_DEPTH 5 /* Used with -d */
108 #define MAX_DUP_DEPTH 1000000 /* the maximum window (and actual size of fd_hash[]) for de-duplication */
110 static fd_hash_t fd_hash[MAX_DUP_DEPTH];
111 static int dup_window = DEFAULT_DUP_DEPTH;
112 static int cur_dup_entry = 0;
114 #define ONE_MILLION 1000000
115 #define ONE_BILLION 1000000000
117 /* Weights of different errors we can introduce */
118 /* We should probably make these command-line arguments */
119 /* XXX - Should we add a bit-level error? */
120 #define ERR_WT_BIT 5 /* Flip a random bit */
121 #define ERR_WT_BYTE 5 /* Substitute a random byte */
122 #define ERR_WT_ALNUM 5 /* Substitute a random character in [A-Za-z0-9] */
123 #define ERR_WT_FMT 2 /* Substitute "%s" */
124 #define ERR_WT_AA 1 /* Fill the remainder of the buffer with 0xAA */
125 #define ERR_WT_TOTAL (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
127 #define ALNUM_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
128 #define ALNUM_LEN (sizeof(ALNUM_CHARS) - 1)
130 struct time_adjustment {
135 typedef struct _chop_t {
144 #define MAX_SELECTIONS 512
145 static struct select_item selectfrm[MAX_SELECTIONS];
146 static int max_selected = -1;
147 static int keep_em = 0;
148 #ifdef PCAP_NG_DEFAULT
149 static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAPNG; /* default to pcapng */
151 static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAP; /* default to pcap */
153 static int out_frame_type = -2; /* Leave frame type alone */
154 static int verbose = 0; /* Not so verbose */
155 static struct time_adjustment time_adj = {{0, 0}, 0}; /* no adjustment */
156 static nstime_t relative_time_window = {0, 0}; /* de-dup time window */
157 static double err_prob = 0.0;
158 static time_t starttime = 0;
159 static time_t stoptime = 0;
160 static gboolean check_startstop = FALSE;
161 static gboolean dup_detect = FALSE;
162 static gboolean dup_detect_by_time = FALSE;
164 static int do_strict_time_adjustment = FALSE;
165 static struct time_adjustment strict_time_adj = {{0, 0}, 0}; /* strict time adjustment */
166 static nstime_t previous_time = {0, 0}; /* previous time */
168 static int find_dct2000_real_data(guint8 *buf);
169 static void handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
170 const struct wtap_pkthdr *in_phdr, guint8 **buf,
174 abs_time_to_str_with_sec_resolution(const nstime_t *abs_time)
177 gchar *buf = (gchar *)g_malloc(16);
179 tmp = localtime(&abs_time->secs);
182 g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
197 fileset_get_filename_by_pattern(guint idx, const nstime_t *time_val,
198 gchar *fprefix, gchar *fsuffix)
204 timestr = abs_time_to_str_with_sec_resolution(time_val);
205 g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
206 abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
213 fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
215 char *pfx, *last_pathsep;
218 save_file = g_strdup(fname);
219 if (save_file == NULL) {
220 fprintf(stderr, "editcap: Out of memory\n");
224 last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
225 pfx = strrchr(save_file,'.');
226 if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
227 /* The pathname has a "." in it, and it's in the last component
228 * of the pathname (because there is either only one component,
229 * i.e. last_pathsep is null as there are no path separators,
230 * or the "." is after the path separator before the last
233 * Treat it as a separator between the rest of the file name and
234 * the file name suffix, and arrange that the names given to the
235 * ring buffer files have the specified suffix, i.e. put the
236 * changing part of the name *before* the suffix. */
238 *fprefix = g_strdup(save_file);
239 pfx[0] = '.'; /* restore capfile_name */
240 *fsuffix = g_strdup(pfx);
242 /* Either there's no "." in the pathname, or it's in a directory
243 * component, so the last component has no suffix. */
244 *fprefix = g_strdup(save_file);
251 /* Add a selection item, a simple parser for now */
253 add_selection(char *sel)
258 if (++max_selected >= MAX_SELECTIONS) {
259 /* Let the user know we stopped selecting */
260 fprintf(stderr, "Out of room for packet selections!\n");
265 fprintf(stderr, "Add_Selected: %s\n", sel);
267 if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
269 fprintf(stderr, "Not inclusive ...");
271 selectfrm[max_selected].inclusive = 0;
272 selectfrm[max_selected].first = atoi(sel);
275 fprintf(stderr, " %i\n", selectfrm[max_selected].first);
278 fprintf(stderr, "Inclusive ...");
281 selectfrm[max_selected].inclusive = 1;
282 selectfrm[max_selected].first = atoi(sel);
283 selectfrm[max_selected].second = atoi(next);
286 fprintf(stderr, " %i, %i\n", selectfrm[max_selected].first,
287 selectfrm[max_selected].second);
293 /* Was the packet selected? */
300 for (i = 0; i <= max_selected; i++) {
301 if (selectfrm[i].inclusive) {
302 if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
305 if (recno == selectfrm[i].first)
313 /* is the packet in the selected timeframe */
315 check_timestamp(wtap *wth)
317 struct wtap_pkthdr *pkthdr = wtap_phdr(wth);
319 return (pkthdr->ts.secs >= starttime) && (pkthdr->ts.secs < stoptime);
323 set_time_adjustment(char *optarg_str_p)
332 /* skip leading whitespace */
333 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
336 /* check for a negative adjustment */
337 if (*optarg_str_p == '-') {
338 time_adj.is_negative = 1;
342 /* collect whole number of seconds, if any */
343 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
347 val = strtol(optarg_str_p, &frac, 10);
348 if (frac == NULL || frac == optarg_str_p
349 || val == LONG_MIN || val == LONG_MAX) {
350 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
354 if (val < 0) { /* implies '--' since we caught '-' above */
355 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
360 time_adj.tv.tv_sec = val;
362 /* now collect the partial seconds, if any */
363 if (*frac != '\0') { /* chars left, so get fractional part */
364 val = strtol(&(frac[1]), &end, 10);
365 /* if more than 6 fractional digits truncate to 6 */
366 if ((end - &(frac[1])) > 6) {
367 frac[7] = 't'; /* 't' for truncate */
368 val = strtol(&(frac[1]), &end, 10);
370 if (*frac != '.' || end == NULL || end == frac || val < 0
371 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
372 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
377 return; /* no fractional digits */
380 /* adjust fractional portion from fractional to numerator
381 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
382 if (frac && end) { /* both are valid */
383 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
384 while(frac_digits < 6) { /* this is frac of 10^6 */
389 time_adj.tv.tv_usec = (int)val;
393 set_strict_time_adj(char *optarg_str_p)
402 /* skip leading whitespace */
403 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
407 * check for a negative adjustment
408 * A negative strict adjustment value is a flag
409 * to adjust all frames by the specifed delta time.
411 if (*optarg_str_p == '-') {
412 strict_time_adj.is_negative = 1;
416 /* collect whole number of seconds, if any */
417 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
421 val = strtol(optarg_str_p, &frac, 10);
422 if (frac == NULL || frac == optarg_str_p
423 || val == LONG_MIN || val == LONG_MAX) {
424 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
428 if (val < 0) { /* implies '--' since we caught '-' above */
429 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
434 strict_time_adj.tv.tv_sec = val;
436 /* now collect the partial seconds, if any */
437 if (*frac != '\0') { /* chars left, so get fractional part */
438 val = strtol(&(frac[1]), &end, 10);
439 /* if more than 6 fractional digits truncate to 6 */
440 if ((end - &(frac[1])) > 6) {
441 frac[7] = 't'; /* 't' for truncate */
442 val = strtol(&(frac[1]), &end, 10);
444 if (*frac != '.' || end == NULL || end == frac || val < 0
445 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
446 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
451 return; /* no fractional digits */
454 /* adjust fractional portion from fractional to numerator
455 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
456 if (frac && end) { /* both are valid */
457 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
458 while(frac_digits < 6) { /* this is frac of 10^6 */
463 strict_time_adj.tv.tv_usec = (int)val;
467 set_rel_time(char *optarg_str_p)
476 /* skip leading whitespace */
477 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
480 /* ignore negative adjustment */
481 if (*optarg_str_p == '-')
484 /* collect whole number of seconds, if any */
485 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
489 val = strtol(optarg_str_p, &frac, 10);
490 if (frac == NULL || frac == optarg_str_p
491 || val == LONG_MIN || val == LONG_MAX) {
492 fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
496 if (val < 0) { /* implies '--' since we caught '-' above */
497 fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
502 relative_time_window.secs = val;
504 /* now collect the partial seconds, if any */
505 if (*frac != '\0') { /* chars left, so get fractional part */
506 val = strtol(&(frac[1]), &end, 10);
507 /* if more than 9 fractional digits truncate to 9 */
508 if ((end - &(frac[1])) > 9) {
509 frac[10] = 't'; /* 't' for truncate */
510 val = strtol(&(frac[1]), &end, 10);
512 if (*frac != '.' || end == NULL || end == frac || val < 0
513 || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
514 fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
519 return; /* no fractional digits */
522 /* adjust fractional portion from fractional to numerator
523 * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
524 if (frac && end) { /* both are valid */
525 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
526 while(frac_digits < 9) { /* this is frac of 10^9 */
531 relative_time_window.nsecs = (int)val;
535 is_duplicate(guint8* fd, guint32 len) {
540 if (cur_dup_entry >= dup_window)
543 /* Calculate our digest */
545 md5_append(&ms, fd, len);
546 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
548 fd_hash[cur_dup_entry].len = len;
550 /* Look for duplicates */
551 for (i = 0; i < dup_window; i++) {
552 if (i == cur_dup_entry)
555 if (fd_hash[i].len == fd_hash[cur_dup_entry].len
556 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
565 is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
570 if (cur_dup_entry >= dup_window)
573 /* Calculate our digest */
575 md5_append(&ms, fd, len);
576 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
578 fd_hash[cur_dup_entry].len = len;
579 fd_hash[cur_dup_entry].time.secs = current->secs;
580 fd_hash[cur_dup_entry].time.nsecs = current->nsecs;
583 * Look for relative time related duplicates.
584 * This is hopefully a reasonably efficient mechanism for
585 * finding duplicates by rel time in the fd_hash[] cache.
586 * We check starting from the most recently added hash
587 * entries and work backwards towards older packets.
588 * This approach allows the dup test to be terminated
589 * when the relative time of a cached entry is found to
590 * be beyond the dup time window.
592 * Of course this assumes that the input trace file is
593 * "well-formed" in the sense that the packet timestamps are
594 * in strict chronologically increasing order (which is NOT
595 * always the case!!).
597 * The fd_hash[] table was deliberately created large (1,000,000).
598 * Looking for time related duplicates in large trace files with
599 * non-fractional dup time window values can potentially take
600 * a long time to complete.
603 for (i = cur_dup_entry - 1;; i--) {
610 if (i == cur_dup_entry) {
612 * We've decremented back to where we started.
618 if (nstime_is_unset(&(fd_hash[i].time))) {
620 * We've decremented to an unused fd_hash[] entry.
626 nstime_delta(&delta, current, &fd_hash[i].time);
628 if (delta.secs < 0 || delta.nsecs < 0) {
630 * A negative delta implies that the current packet
631 * has an absolute timestamp less than the cached packet
632 * that it is being compared to. This is NOT a normal
633 * situation since trace files usually have packets in
634 * chronological order (oldest to newest).
636 * There are several possible ways to deal with this:
637 * 1. 'continue' dup checking with the next cached frame.
638 * 2. 'break' from looking for a duplicate of the current frame.
639 * 3. Take the absolute value of the delta and see if that
640 * falls within the specifed dup time window.
642 * Currently this code does option 1. But it would pretty
643 * easy to add yet-another-editcap-option to select one of
644 * the other behaviors for dealing with out-of-sequence
650 cmp = nstime_cmp(&delta, &relative_time_window);
654 * The delta time indicates that we are now looking at
655 * cached packets beyond the specified dup time window.
659 } else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
660 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
669 usage(gboolean is_error)
678 fprintf(output, "Editcap %s"
680 " (" SVNVERSION " from " SVNPATH ")"
683 fprintf(output, "Edit and/or translate the format of capture files.\n");
684 fprintf(output, "See http://www.wireshark.org for more information.\n");
685 fprintf(output, "\n");
686 fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
687 fprintf(output, "\n");
688 fprintf(output, "<infile> and <outfile> must both be present.\n");
689 fprintf(output, "A single packet or a range of packets can be selected.\n");
690 fprintf(output, "\n");
691 fprintf(output, "Packet selection:\n");
692 fprintf(output, " -r keep the selected packets; default is to delete them.\n");
693 fprintf(output, " -A <start time> only output packets whose timestamp is after (or equal\n");
694 fprintf(output, " to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
695 fprintf(output, " -B <stop time> only output packets whose timestamp is before the\n");
696 fprintf(output, " given time (format as YYYY-MM-DD hh:mm:ss).\n");
697 fprintf(output, "\n");
698 fprintf(output, "Duplicate packet removal:\n");
699 fprintf(output, " -d remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
700 fprintf(output, " -D <dup window> remove packet if duplicate; configurable <dup window>\n");
701 fprintf(output, " Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
702 fprintf(output, " NOTE: A <dup window> of 0 with -v (verbose option) is\n");
703 fprintf(output, " useful to print MD5 hashes.\n");
704 fprintf(output, " -w <dup time window> remove packet if duplicate packet is found EQUAL TO OR\n");
705 fprintf(output, " LESS THAN <dup time window> prior to current packet.\n");
706 fprintf(output, " A <dup time window> is specified in relative seconds\n");
707 fprintf(output, " (e.g. 0.000001).\n");
708 fprintf(output, "\n");
709 fprintf(output, " NOTE: The use of the 'Duplicate packet removal' options with\n");
710 fprintf(output, " other editcap options except -v may not always work as expected.\n");
711 fprintf(output, " Specifically the -r, -t or -S options will very likely NOT have the\n");
712 fprintf(output, " desired effect if combined with the -d, -D or -w.\n");
713 fprintf(output, "\n");
714 fprintf(output, "Packet manipulation:\n");
715 fprintf(output, " -s <snaplen> truncate each packet to max. <snaplen> bytes of data.\n");
716 fprintf(output, " -C [offset:]<choplen> chop each packet by <choplen> bytes. Positive values\n");
717 fprintf(output, " chop at the packet beginning, negative values at the\n");
718 fprintf(output, " packet end. If an optional offset precedes the length,\n");
719 fprintf(output, " then the bytes chopped will be offset from that value.\n");
720 fprintf(output, " Positive offsets are from the packet beginning,\n");
721 fprintf(output, " negative offsets are from the packet end. You can use\n");
722 fprintf(output, " this option more than once, allowing up to 2 chopping\n");
723 fprintf(output, " regions within a packet provided that at least 1\n");
724 fprintf(output, " choplen is positive and at least 1 is negative.\n");
725 fprintf(output, " -L adjust the frame length when chopping and/or snapping\n");
726 fprintf(output, " -t <time adjustment> adjust the timestamp of each packet;\n");
727 fprintf(output, " <time adjustment> is in relative seconds (e.g. -0.5).\n");
728 fprintf(output, " -S <strict adjustment> adjust timestamp of packets if necessary to insure\n");
729 fprintf(output, " strict chronological increasing order. The <strict\n");
730 fprintf(output, " adjustment> is specified in relative seconds with\n");
731 fprintf(output, " values of 0 or 0.000001 being the most reasonable.\n");
732 fprintf(output, " A negative adjustment value will modify timestamps so\n");
733 fprintf(output, " that each packet's delta time is the absolute value\n");
734 fprintf(output, " of the adjustment specified. A value of -0 will set\n");
735 fprintf(output, " all packets to the timestamp of the first packet.\n");
736 fprintf(output, " -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
737 fprintf(output, " a particular packet byte will be randomly changed.\n");
738 fprintf(output, "\n");
739 fprintf(output, "Output File(s):\n");
740 fprintf(output, " -c <packets per file> split the packet output to different files based on\n");
741 fprintf(output, " uniform packet counts with a maximum of\n");
742 fprintf(output, " <packets per file> each.\n");
743 fprintf(output, " -i <seconds per file> split the packet output to different files based on\n");
744 fprintf(output, " uniform time intervals with a maximum of\n");
745 fprintf(output, " <seconds per file> each.\n");
746 fprintf(output, " -F <capture type> set the output file type; default is pcapng. An empty\n");
747 fprintf(output, " \"-F\" option will list the file types.\n");
748 fprintf(output, " -T <encap type> set the output file encapsulation type; default is the\n");
749 fprintf(output, " same as the input file. An empty \"-T\" option will\n");
750 fprintf(output, " list the encapsulation types.\n");
751 fprintf(output, "\n");
752 fprintf(output, "Miscellaneous:\n");
753 fprintf(output, " -h display this help and exit.\n");
754 fprintf(output, " -v verbose output.\n");
755 fprintf(output, " If -v is used with any of the 'Duplicate Packet\n");
756 fprintf(output, " Removal' options (-d, -D or -w) then Packet lengths\n");
757 fprintf(output, " and MD5 hashes are printed to standard-error.\n");
758 fprintf(output, "\n");
762 const char *sstr; /* The short string */
763 const char *lstr; /* The long string */
767 string_compare(gconstpointer a, gconstpointer b)
769 return strcmp(((const struct string_elem *)a)->sstr,
770 ((const struct string_elem *)b)->sstr);
774 string_nat_compare(gconstpointer a, gconstpointer b)
776 return strnatcmp(((const struct string_elem *)a)->sstr,
777 ((const struct string_elem *)b)->sstr);
781 string_elem_print(gpointer data, gpointer not_used _U_)
783 fprintf(stderr, " %s - %s\n",
784 ((struct string_elem *)data)->sstr,
785 ((struct string_elem *)data)->lstr);
789 list_capture_types(void) {
791 struct string_elem *captypes;
794 captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES_SUBTYPES);
795 fprintf(stderr, "editcap: The available capture file types for the \"-F\" flag are:\n");
796 for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
797 if (wtap_dump_can_open(i)) {
798 captypes[i].sstr = wtap_file_type_subtype_short_string(i);
799 captypes[i].lstr = wtap_file_type_subtype_string(i);
800 list = g_slist_insert_sorted(list, &captypes[i], string_compare);
803 g_slist_foreach(list, string_elem_print, NULL);
809 list_encap_types(void) {
811 struct string_elem *encaps;
814 encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
815 fprintf(stderr, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
816 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
817 encaps[i].sstr = wtap_encap_short_string(i);
818 if (encaps[i].sstr != NULL) {
819 encaps[i].lstr = wtap_encap_string(i);
820 list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
823 g_slist_foreach(list, string_elem_print, NULL);
830 * Don't report failures to load plugins because most (non-wiretap) plugins
831 * *should* fail to load (because we're not linked against libwireshark and
832 * dissector plugins need libwireshark).
835 failure_message(const char *msg_format _U_, va_list ap _U_)
841 main(int argc, char *argv[])
849 guint32 snaplen = 0; /* No limit */
850 chop_t chop = {0, 0, 0, 0, 0, 0}; /* No chop */
851 gboolean adjlen = FALSE;
852 wtap_dumper *pdh = NULL;
853 unsigned int count = 1;
854 unsigned int duplicate_count = 0;
858 guint32 read_count = 0;
859 int split_packet_count = 0;
860 int written_count = 0;
861 char *filename = NULL;
862 gboolean ts_okay = TRUE;
863 int secs_per_block = 0;
865 nstime_t block_start;
866 gchar *fprefix = NULL;
867 gchar *fsuffix = NULL;
869 const struct wtap_pkthdr *phdr;
870 struct wtap_pkthdr snap_phdr;
871 wtapng_iface_descriptions_t *idb_inf;
872 wtapng_section_t *shb_hdr;
875 char* init_progfile_dir_error;
879 arg_list_utf_16to8(argc, argv);
880 create_app_running_mutex();
884 * Get credential information for later use.
886 init_process_policies();
889 /* Register wiretap plugins */
890 if ((init_progfile_dir_error = init_progfile_dir(argv[0], main))) {
891 g_warning("editcap: init_progfile_dir(): %s", init_progfile_dir_error);
892 g_free(init_progfile_dir_error);
894 /* Register all the plugin types we have. */
895 wtap_register_plugin_types(); /* Types known to libwiretap */
897 init_report_err(failure_message,NULL,NULL,NULL);
899 /* Scan for plugins. This does *not* call their registration routines;
900 that's done later. */
903 /* Register all libwiretap plugin modules. */
904 register_all_wiretap_modules();
908 /* Process the options */
909 while ((opt = getopt(argc, argv, "A:B:c:C:dD:E:F:hi:Lrs:S:t:T:vw:")) != -1) {
915 memset(&starttm,0,sizeof(struct tm));
917 if (!strptime(optarg,"%Y-%m-%d %T", &starttm)) {
918 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
923 check_startstop = TRUE;
924 starttm.tm_isdst = -1;
926 starttime = mktime(&starttm);
934 memset(&stoptm,0,sizeof(struct tm));
936 if (!strptime(optarg,"%Y-%m-%d %T", &stoptm)) {
937 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
941 check_startstop = TRUE;
942 stoptm.tm_isdst = -1;
943 stoptime = mktime(&stoptm);
948 split_packet_count = (int)strtol(optarg, &p, 10);
949 if (p == optarg || *p != '\0') {
950 fprintf(stderr, "editcap: \"%s\" isn't a valid packet count\n",
954 if (split_packet_count <= 0) {
955 fprintf(stderr, "editcap: \"%d\" packet count must be larger than zero\n",
963 int choplen = 0, chopoff = 0;
965 switch (sscanf(optarg, "%d:%d", &chopoff, &choplen)) {
966 case 1: /* only the chop length was specififed */
971 case 2: /* both an offset and chop length was specified */
975 fprintf(stderr, "editcap: \"%s\" isn't a valid chop length or offset:length\n",
982 chop.len_begin += choplen;
984 chop.off_begin_pos += chopoff;
986 chop.off_begin_neg += chopoff;
987 } else if (choplen < 0) {
988 chop.len_end += choplen;
990 chop.off_end_pos += chopoff;
992 chop.off_end_neg += chopoff;
999 dup_detect_by_time = FALSE;
1000 dup_window = DEFAULT_DUP_DEPTH;
1005 dup_detect_by_time = FALSE;
1006 dup_window = (int)strtol(optarg, &p, 10);
1007 if (p == optarg || *p != '\0') {
1008 fprintf(stderr, "editcap: \"%s\" isn't a valid duplicate window value\n",
1012 if (dup_window < 0 || dup_window > MAX_DUP_DEPTH) {
1013 fprintf(stderr, "editcap: \"%d\" duplicate window value must be between 0 and %d inclusive.\n",
1014 dup_window, MAX_DUP_DEPTH);
1020 err_prob = strtod(optarg, &p);
1021 if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
1022 fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
1026 srand( (unsigned int) (time(NULL) + getpid()) );
1030 out_file_type_subtype = wtap_short_string_to_file_type_subtype(optarg);
1031 if (out_file_type_subtype < 0) {
1032 fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
1034 list_capture_types();
1044 case 'i': /* break capture file based on time interval */
1045 secs_per_block = atoi(optarg);
1046 if (secs_per_block <= 0) {
1047 fprintf(stderr, "editcap: \"%s\" isn't a valid time interval\n\n",
1058 keep_em = !keep_em; /* Just invert */
1062 snaplen = (guint32)strtol(optarg, &p, 10);
1063 if (p == optarg || *p != '\0') {
1064 fprintf(stderr, "editcap: \"%s\" isn't a valid snapshot length\n",
1071 set_strict_time_adj(optarg);
1072 do_strict_time_adjustment = TRUE;
1076 set_time_adjustment(optarg);
1080 out_frame_type = wtap_short_string_to_encap(optarg);
1081 if (out_frame_type < 0) {
1082 fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
1090 verbose = !verbose; /* Just invert */
1095 dup_detect_by_time = TRUE;
1096 dup_window = MAX_DUP_DEPTH;
1097 set_rel_time(optarg);
1100 case '?': /* Bad options if GNU getopt */
1103 list_capture_types();
1118 fprintf(stderr, "Optind = %i, argc = %i\n", optind, argc);
1121 if ((argc - optind) < 1) {
1126 if (check_startstop && !stoptime) {
1129 /* XXX: will work until 2035 */
1130 memset(&stoptm,0,sizeof(struct tm));
1131 stoptm.tm_year = 135;
1132 stoptm.tm_mday = 31;
1135 stoptime = mktime(&stoptm);
1138 nstime_set_unset(&block_start);
1140 if (starttime > stoptime) {
1141 fprintf(stderr, "editcap: start time is after the stop time\n");
1145 if (split_packet_count > 0 && secs_per_block > 0) {
1146 fprintf(stderr, "editcap: can't split on both packet count and time interval\n");
1147 fprintf(stderr, "editcap: at the same time\n");
1151 wth = wtap_open_offline(argv[optind], &err, &err_info, FALSE);
1154 fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
1155 wtap_strerror(err));
1157 case WTAP_ERR_UNSUPPORTED:
1158 case WTAP_ERR_UNSUPPORTED_ENCAP:
1159 case WTAP_ERR_BAD_FILE:
1160 fprintf(stderr, "(%s)\n", err_info);
1168 fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
1169 wtap_file_type_subtype_string(wtap_file_type_subtype(wth)));
1172 shb_hdr = wtap_file_get_shb_info(wth);
1173 idb_inf = wtap_file_get_idb_info(wth);
1176 * Now, process the rest, if any ... we only write if there is an extra
1177 * argument or so ...
1180 if ((argc - optind) >= 2) {
1181 if (out_frame_type == -2)
1182 out_frame_type = wtap_file_encap(wth);
1184 for (i = optind + 2; i < argc; i++)
1185 if (add_selection(argv[i]) == FALSE)
1188 if (dup_detect || dup_detect_by_time) {
1189 for (i = 0; i < dup_window; i++) {
1190 memset(&fd_hash[i].digest, 0, 16);
1192 nstime_set_unset(&fd_hash[i].time);
1196 while (wtap_read(wth, &err, &err_info, &data_offset)) {
1199 phdr = wtap_phdr(wth);
1200 buf = wtap_buf_ptr(wth);
1202 if (nstime_is_unset(&block_start)) { /* should only be the first packet */
1203 block_start.secs = phdr->ts.secs;
1204 block_start.nsecs = phdr->ts.nsecs;
1206 if (split_packet_count > 0 || secs_per_block > 0) {
1207 if (!fileset_extract_prefix_suffix(argv[optind+1], &fprefix, &fsuffix))
1210 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1212 filename = g_strdup(argv[optind+1]);
1215 /* If we don't have an application name add Editcap */
1216 if (shb_hdr->shb_user_appl == NULL) {
1217 shb_hdr->shb_user_appl = "Editcap " VERSION;
1220 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1221 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1222 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1225 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1226 filename, wtap_strerror(err));
1233 if (secs_per_block > 0) {
1234 while ((phdr->ts.secs - block_start.secs > secs_per_block)
1235 || (phdr->ts.secs - block_start.secs == secs_per_block
1236 && phdr->ts.nsecs >= block_start.nsecs )) { /* time for the next file */
1238 if (!wtap_dump_close(pdh, &err)) {
1239 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1240 filename, wtap_strerror(err));
1243 block_start.secs = block_start.secs + secs_per_block; /* reset for next interval */
1245 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1249 fprintf(stderr, "Continuing writing in file %s\n", filename);
1251 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1252 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1253 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1256 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1257 filename, wtap_strerror(err));
1263 if (split_packet_count > 0) {
1264 /* time for the next file? */
1265 if (written_count > 0 && written_count % split_packet_count == 0) {
1266 if (!wtap_dump_close(pdh, &err)) {
1267 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1268 filename, wtap_strerror(err));
1273 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1277 fprintf(stderr, "Continuing writing in file %s\n", filename);
1279 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1280 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1281 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1283 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1284 filename, wtap_strerror(err));
1290 if (check_startstop)
1291 ts_okay = check_timestamp(wth);
1293 if (ts_okay && ((!selected(count) && !keep_em)
1294 || (selected(count) && keep_em))) {
1296 if (verbose && !dup_detect && !dup_detect_by_time)
1297 fprintf(stderr, "Packet: %u\n", count);
1299 /* We simply write it, perhaps after truncating it; we could
1300 * do other things, like modify it. */
1302 phdr = wtap_phdr(wth);
1305 if (phdr->caplen > snaplen) {
1307 snap_phdr.caplen = snaplen;
1310 if (adjlen && phdr->len > snaplen) {
1312 snap_phdr.len = snaplen;
1319 handle_chopping(chop, &snap_phdr, phdr, &buf, adjlen);
1322 /* Do we adjust timestamps to ensure strict chronological
1324 if (do_strict_time_adjustment) {
1325 if (previous_time.secs || previous_time.nsecs) {
1326 if (!strict_time_adj.is_negative) {
1330 current.secs = phdr->ts.secs;
1331 current.nsecs = phdr->ts.nsecs;
1333 nstime_delta(&delta, ¤t, &previous_time);
1335 if (delta.secs < 0 || delta.nsecs < 0) {
1337 * A negative delta indicates that the current packet
1338 * has an absolute timestamp less than the previous packet
1339 * that it is being compared to. This is NOT a normal
1340 * situation since trace files usually have packets in
1341 * chronological order (oldest to newest).
1343 /* fprintf(stderr, "++out of order, need to adjust this packet!\n"); */
1345 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1346 snap_phdr.ts.nsecs = previous_time.nsecs;
1347 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1349 snap_phdr.ts.secs++;
1350 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1352 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1358 * A negative strict time adjustment is requested.
1359 * Unconditionally set each timestamp to previous
1360 * packet's timestamp plus delta.
1363 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1364 snap_phdr.ts.nsecs = previous_time.nsecs;
1365 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1367 snap_phdr.ts.secs++;
1368 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1370 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1375 previous_time.secs = phdr->ts.secs;
1376 previous_time.nsecs = phdr->ts.nsecs;
1379 /* assume that if the frame's tv_sec is 0, then
1380 * the timestamp isn't supported */
1381 if (phdr->ts.secs > 0 && time_adj.tv.tv_sec != 0) {
1383 if (time_adj.is_negative)
1384 snap_phdr.ts.secs -= time_adj.tv.tv_sec;
1386 snap_phdr.ts.secs += time_adj.tv.tv_sec;
1390 /* assume that if the frame's tv_sec is 0, then
1391 * the timestamp isn't supported */
1392 if (phdr->ts.secs > 0 && time_adj.tv.tv_usec != 0) {
1394 if (time_adj.is_negative) { /* subtract */
1395 if (snap_phdr.ts.nsecs/1000 < time_adj.tv.tv_usec) { /* borrow */
1396 snap_phdr.ts.secs--;
1397 snap_phdr.ts.nsecs += ONE_MILLION * 1000;
1399 snap_phdr.ts.nsecs -= time_adj.tv.tv_usec * 1000;
1401 if (snap_phdr.ts.nsecs + time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1403 snap_phdr.ts.secs++;
1404 snap_phdr.ts.nsecs += (time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1406 snap_phdr.ts.nsecs += time_adj.tv.tv_usec * 1000;
1412 /* suppress duplicates by packet window */
1414 if (is_duplicate(buf, phdr->caplen)) {
1416 fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
1417 count, phdr->caplen);
1418 for (i = 0; i < 16; i++)
1419 fprintf(stderr, "%02x",
1420 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1421 fprintf(stderr, "\n");
1428 fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
1429 count, phdr->caplen);
1430 for (i = 0; i < 16; i++)
1431 fprintf(stderr, "%02x",
1432 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1433 fprintf(stderr, "\n");
1438 /* suppress duplicates by time window */
1439 if (dup_detect_by_time) {
1442 current.secs = phdr->ts.secs;
1443 current.nsecs = phdr->ts.nsecs;
1445 if (is_duplicate_rel_time(buf, phdr->caplen, ¤t)) {
1447 fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
1448 count, phdr->caplen);
1449 for (i = 0; i < 16; i++)
1450 fprintf(stderr, "%02x",
1451 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1452 fprintf(stderr, "\n");
1459 fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
1460 count, phdr->caplen);
1461 for (i = 0; i < 16; i++)
1462 fprintf(stderr, "%02x",
1463 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1464 fprintf(stderr, "\n");
1469 /* Random error mutation */
1470 if (err_prob > 0.0) {
1471 int real_data_start = 0;
1473 /* Protect non-protocol data */
1474 if (wtap_file_type_subtype(wth) == WTAP_FILE_TYPE_SUBTYPE_CATAPULT_DCT2000)
1475 real_data_start = find_dct2000_real_data(buf);
1477 for (i = real_data_start; i < (int) phdr->caplen; i++) {
1478 if (rand() <= err_prob * RAND_MAX) {
1479 err_type = rand() / (RAND_MAX / ERR_WT_TOTAL + 1);
1481 if (err_type < ERR_WT_BIT) {
1482 buf[i] ^= 1 << (rand() / (RAND_MAX / 8 + 1));
1483 err_type = ERR_WT_TOTAL;
1485 err_type -= ERR_WT_BYTE;
1488 if (err_type < ERR_WT_BYTE) {
1489 buf[i] = rand() / (RAND_MAX / 255 + 1);
1490 err_type = ERR_WT_TOTAL;
1492 err_type -= ERR_WT_BYTE;
1495 if (err_type < ERR_WT_ALNUM) {
1496 buf[i] = ALNUM_CHARS[rand() / (RAND_MAX / ALNUM_LEN + 1)];
1497 err_type = ERR_WT_TOTAL;
1499 err_type -= ERR_WT_ALNUM;
1502 if (err_type < ERR_WT_FMT) {
1503 if ((unsigned int)i < phdr->caplen - 2)
1504 g_strlcpy((char*) &buf[i], "%s", 2);
1505 err_type = ERR_WT_TOTAL;
1507 err_type -= ERR_WT_FMT;
1510 if (err_type < ERR_WT_AA) {
1511 for (j = i; j < (int) phdr->caplen; j++)
1519 if (!wtap_dump(pdh, phdr, buf, &err)) {
1521 case WTAP_ERR_UNSUPPORTED_ENCAP:
1523 * This is a problem with the particular frame we're
1524 * writing and the file type and subtype we're
1525 * writing; note that, and report the frame number
1526 * and file type/subtype.
1529 "editcap: Frame %u of \"%s\" has a network type that can't be saved in a \"%s\" file\n.",
1530 read_count, argv[optind],
1531 wtap_file_type_subtype_string(out_file_type_subtype));
1534 case WTAP_ERR_PACKET_TOO_LARGE:
1536 * This is a problem with the particular frame we're
1537 * writing and the file type and subtype we're
1538 * writing; note that, and report the frame number
1539 * and file type/subtype.
1542 "editcap: Frame %u of \"%s\" is too large for a \"%s\" file\n.",
1543 read_count, argv[optind],
1544 wtap_file_type_subtype_string(out_file_type_subtype));
1548 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1549 filename, wtap_strerror(err));
1563 /* Print a message noting that the read failed somewhere along the
1566 "editcap: An error occurred while reading \"%s\": %s.\n",
1567 argv[optind], wtap_strerror(err));
1569 case WTAP_ERR_UNSUPPORTED:
1570 case WTAP_ERR_UNSUPPORTED_ENCAP:
1571 case WTAP_ERR_BAD_FILE:
1572 fprintf(stderr, "(%s)\n", err_info);
1579 /* No valid packages found, open the outfile so we can write an
1582 filename = g_strdup(argv[optind+1]);
1584 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1585 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)): wtap_snapshot_length(wth),
1586 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1588 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1589 filename, wtap_strerror(err));
1597 if (!wtap_dump_close(pdh, &err)) {
1598 fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
1599 wtap_strerror(err));
1607 fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate window of %i packets.\n",
1608 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1609 plurality(duplicate_count, "", "s"), dup_window);
1610 } else if (dup_detect_by_time) {
1611 fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate time window equal to or less than %ld.%09ld seconds.\n",
1612 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1613 plurality(duplicate_count, "", "s"),
1614 (long)relative_time_window.secs,
1615 (long int)relative_time_window.nsecs);
1621 /* Skip meta-information read from file to return offset of real
1624 find_dct2000_real_data(guint8 *buf)
1628 for (n = 0; buf[n] != '\0'; n++); /* Context name */
1630 n++; /* Context port number */
1631 for (; buf[n] != '\0'; n++); /* Timestamp */
1633 for (; buf[n] != '\0'; n++); /* Protocol name */
1635 for (; buf[n] != '\0'; n++); /* Variant number (as string) */
1637 for (; buf[n] != '\0'; n++); /* Outhdr (as string) */
1639 n += 2; /* Direction & encap */
1645 * We support up to 2 chopping regions in a single pass: one specified by the
1646 * positive chop length, and one by the negative chop length.
1649 handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
1650 const struct wtap_pkthdr *in_phdr, guint8 **buf,
1653 /* If we're not chopping anything from one side, then the offset for that
1654 * side is meaningless. */
1655 if (chop.len_begin == 0)
1656 chop.off_begin_pos = chop.off_begin_neg = 0;
1657 if (chop.len_end == 0)
1658 chop.off_end_pos = chop.off_end_neg = 0;
1660 if (chop.off_begin_neg < 0) {
1661 chop.off_begin_pos += in_phdr->caplen + chop.off_begin_neg;
1662 chop.off_begin_neg = 0;
1664 if (chop.off_end_pos > 0) {
1665 chop.off_end_neg += chop.off_end_pos - in_phdr->caplen;
1666 chop.off_end_pos = 0;
1669 /* If we've crossed chopping regions, swap them */
1670 if (chop.len_begin && chop.len_end) {
1671 if (chop.off_begin_pos > ((int)in_phdr->caplen + chop.off_end_neg)) {
1672 int tmp_len, tmp_off;
1674 tmp_off = in_phdr->caplen + chop.off_end_neg + chop.len_end;
1675 tmp_len = -chop.len_end;
1677 chop.off_end_neg = chop.len_begin + chop.off_begin_pos - in_phdr->caplen;
1678 chop.len_end = -chop.len_begin;
1680 chop.len_begin = tmp_len;
1681 chop.off_begin_pos = tmp_off;
1685 /* Make sure we don't chop off more than we have available */
1686 if (in_phdr->caplen < (guint32)(chop.off_begin_pos - chop.off_end_neg)) {
1690 if ((guint32)(chop.len_begin - chop.len_end) >
1691 (in_phdr->caplen - (guint32)(chop.off_begin_pos - chop.off_end_neg))) {
1692 chop.len_begin = in_phdr->caplen - (chop.off_begin_pos - chop.off_end_neg);
1696 /* Handle chopping from the beginning. Note that if a beginning offset
1697 * was specified, we need to keep that piece */
1698 if (chop.len_begin > 0) {
1699 *out_phdr = *in_phdr;
1701 if (chop.off_begin_pos > 0) {
1702 memmove(*buf + chop.off_begin_pos,
1703 *buf + chop.off_begin_pos + chop.len_begin,
1704 out_phdr->caplen - chop.len_begin);
1706 *buf += chop.len_begin;
1708 out_phdr->caplen -= chop.len_begin;
1711 if (in_phdr->len > (guint32)chop.len_begin)
1712 out_phdr->len -= chop.len_begin;
1719 /* Handle chopping from the end. Note that if an ending offset was
1720 * specified, we need to keep that piece */
1721 if (chop.len_end < 0) {
1722 *out_phdr = *in_phdr;
1724 if (chop.off_end_neg < 0) {
1725 memmove(*buf + (gint)out_phdr->caplen + (chop.len_end + chop.off_end_neg),
1726 *buf + (gint)out_phdr->caplen + chop.off_end_neg,
1729 out_phdr->caplen += chop.len_end;
1732 if (((signed int) in_phdr->len + chop.len_end) > 0)
1733 out_phdr->len += chop.len_end;
1737 /*in_phdr = out_phdr;*/
1742 * Editor modelines - http://www.wireshark.org/tools/modelines.html
1747 * indent-tabs-mode: nil
1750 * vi: set shiftwidth=4 tabstop=8 expandtab:
1751 * :indentSize=4:tabSize=8:noTabs=true: