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/report_err.h>
80 #include <wsutil/strnatcmp.h>
81 #include <wsutil/md5.h>
84 * The symbols declared in the below are exported from libwireshark,
85 * but we don't want to link whole libwireshark to editcap.
86 * We link the object directly instead and this needs a little trick
87 * with the WS_BUILD_DLL #define.
90 #define RESET_SYMBOL_EXPORT /* wsutil/wsgetopt.h set export behavior above. */
91 #include "epan/plugins.h"
92 #include "epan/filesystem.h"
94 #define RESET_SYMBOL_EXPORT
96 #include "svnversion.h"
98 #include "ringbuffer.h" /* For RINGBUFFER_MAX_NUM_FILES */
101 * Some globals so we can pass things to various routines
110 * Duplicate frame detection
112 typedef struct _fd_hash_t {
113 md5_byte_t digest[16];
118 #define DEFAULT_DUP_DEPTH 5 /* Used with -d */
119 #define MAX_DUP_DEPTH 1000000 /* the maximum window (and actual size of fd_hash[]) for de-duplication */
121 static fd_hash_t fd_hash[MAX_DUP_DEPTH];
122 static int dup_window = DEFAULT_DUP_DEPTH;
123 static int cur_dup_entry = 0;
125 #define ONE_MILLION 1000000
126 #define ONE_BILLION 1000000000
128 /* Weights of different errors we can introduce */
129 /* We should probably make these command-line arguments */
130 /* XXX - Should we add a bit-level error? */
131 #define ERR_WT_BIT 5 /* Flip a random bit */
132 #define ERR_WT_BYTE 5 /* Substitute a random byte */
133 #define ERR_WT_ALNUM 5 /* Substitute a random character in [A-Za-z0-9] */
134 #define ERR_WT_FMT 2 /* Substitute "%s" */
135 #define ERR_WT_AA 1 /* Fill the remainder of the buffer with 0xAA */
136 #define ERR_WT_TOTAL (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
138 #define ALNUM_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
139 #define ALNUM_LEN (sizeof(ALNUM_CHARS) - 1)
141 struct time_adjustment {
146 typedef struct _chop_t {
155 #define MAX_SELECTIONS 512
156 static struct select_item selectfrm[MAX_SELECTIONS];
157 static int max_selected = -1;
158 static int keep_em = 0;
159 #ifdef PCAP_NG_DEFAULT
160 static int out_file_type = WTAP_FILE_PCAPNG; /* default to pcapng */
162 static int out_file_type = WTAP_FILE_PCAP; /* default to pcap */
164 static int out_frame_type = -2; /* Leave frame type alone */
165 static int verbose = 0; /* Not so verbose */
166 static struct time_adjustment time_adj = {{0, 0}, 0}; /* no adjustment */
167 static nstime_t relative_time_window = {0, 0}; /* de-dup time window */
168 static double err_prob = 0.0;
169 static time_t starttime = 0;
170 static time_t stoptime = 0;
171 static gboolean check_startstop = FALSE;
172 static gboolean dup_detect = FALSE;
173 static gboolean dup_detect_by_time = FALSE;
175 static int do_strict_time_adjustment = FALSE;
176 static struct time_adjustment strict_time_adj = {{0, 0}, 0}; /* strict time adjustment */
177 static nstime_t previous_time = {0, 0}; /* previous time */
179 static int find_dct2000_real_data(guint8 *buf);
180 static void handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
181 const struct wtap_pkthdr *in_phdr, guint8 *buf,
185 abs_time_to_str_with_sec_resolution(const struct wtap_nstime *abs_time)
188 gchar *buf = (gchar *)g_malloc(16);
190 #if (defined _WIN32) && (_MSC_VER < 1500)
191 /* calling localtime() on MSVC 2005 with huge values causes it to crash */
192 /* XXX - find the exact value that still does work */
193 /* XXX - using _USE_32BIT_TIME_T might be another way to circumvent this problem */
194 if (abs_time->secs > 2000000000)
198 tmp = localtime(&abs_time->secs);
201 g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
216 fileset_get_filename_by_pattern(guint idx, const struct wtap_nstime *time_val,
217 gchar *fprefix, gchar *fsuffix)
223 timestr = abs_time_to_str_with_sec_resolution(time_val);
224 g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
225 abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
232 fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
234 char *pfx, *last_pathsep;
237 save_file = g_strdup(fname);
238 if (save_file == NULL) {
239 fprintf(stderr, "editcap: Out of memory\n");
243 last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
244 pfx = strrchr(save_file,'.');
245 if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
246 /* The pathname has a "." in it, and it's in the last component
247 * of the pathname (because there is either only one component,
248 * i.e. last_pathsep is null as there are no path separators,
249 * or the "." is after the path separator before the last
252 * Treat it as a separator between the rest of the file name and
253 * the file name suffix, and arrange that the names given to the
254 * ring buffer files have the specified suffix, i.e. put the
255 * changing part of the name *before* the suffix. */
257 *fprefix = g_strdup(save_file);
258 pfx[0] = '.'; /* restore capfile_name */
259 *fsuffix = g_strdup(pfx);
261 /* Either there's no "." in the pathname, or it's in a directory
262 * component, so the last component has no suffix. */
263 *fprefix = g_strdup(save_file);
270 /* Add a selection item, a simple parser for now */
272 add_selection(char *sel)
277 if (++max_selected >= MAX_SELECTIONS) {
278 /* Let the user know we stopped selecting */
279 printf("Out of room for packet selections!\n");
283 printf("Add_Selected: %s\n", sel);
285 if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
286 printf("Not inclusive ...");
288 selectfrm[max_selected].inclusive = 0;
289 selectfrm[max_selected].first = atoi(sel);
291 printf(" %i\n", selectfrm[max_selected].first);
293 printf("Inclusive ...");
296 selectfrm[max_selected].inclusive = 1;
297 selectfrm[max_selected].first = atoi(sel);
298 selectfrm[max_selected].second = atoi(next);
300 printf(" %i, %i\n", selectfrm[max_selected].first,
301 selectfrm[max_selected].second);
307 /* Was the packet selected? */
314 for (i = 0; i <= max_selected; i++) {
315 if (selectfrm[i].inclusive) {
316 if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
319 if (recno == selectfrm[i].first)
327 /* is the packet in the selected timeframe */
329 check_timestamp(wtap *wth)
331 struct wtap_pkthdr* pkthdr = wtap_phdr(wth);
333 return (pkthdr->ts.secs >= starttime) && (pkthdr->ts.secs < stoptime);
337 set_time_adjustment(char *optarg_str_p)
346 /* skip leading whitespace */
347 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
350 /* check for a negative adjustment */
351 if (*optarg_str_p == '-') {
352 time_adj.is_negative = 1;
356 /* collect whole number of seconds, if any */
357 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
361 val = strtol(optarg_str_p, &frac, 10);
362 if (frac == NULL || frac == optarg_str_p
363 || val == LONG_MIN || val == LONG_MAX) {
364 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
368 if (val < 0) { /* implies '--' since we caught '-' above */
369 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
374 time_adj.tv.tv_sec = val;
376 /* now collect the partial seconds, if any */
377 if (*frac != '\0') { /* chars left, so get fractional part */
378 val = strtol(&(frac[1]), &end, 10);
379 /* if more than 6 fractional digits truncate to 6 */
380 if ((end - &(frac[1])) > 6) {
381 frac[7] = 't'; /* 't' for truncate */
382 val = strtol(&(frac[1]), &end, 10);
384 if (*frac != '.' || end == NULL || end == frac || val < 0
385 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
386 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
391 return; /* no fractional digits */
394 /* adjust fractional portion from fractional to numerator
395 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
396 if (frac && end) { /* both are valid */
397 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
398 while(frac_digits < 6) { /* this is frac of 10^6 */
403 time_adj.tv.tv_usec = (int)val;
407 set_strict_time_adj(char *optarg_str_p)
416 /* skip leading whitespace */
417 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
421 * check for a negative adjustment
422 * A negative strict adjustment value is a flag
423 * to adjust all frames by the specifed delta time.
425 if (*optarg_str_p == '-') {
426 strict_time_adj.is_negative = 1;
430 /* collect whole number of seconds, if any */
431 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
435 val = strtol(optarg_str_p, &frac, 10);
436 if (frac == NULL || frac == optarg_str_p
437 || val == LONG_MIN || val == LONG_MAX) {
438 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
442 if (val < 0) { /* implies '--' since we caught '-' above */
443 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
448 strict_time_adj.tv.tv_sec = val;
450 /* now collect the partial seconds, if any */
451 if (*frac != '\0') { /* chars left, so get fractional part */
452 val = strtol(&(frac[1]), &end, 10);
453 /* if more than 6 fractional digits truncate to 6 */
454 if ((end - &(frac[1])) > 6) {
455 frac[7] = 't'; /* 't' for truncate */
456 val = strtol(&(frac[1]), &end, 10);
458 if (*frac != '.' || end == NULL || end == frac || val < 0
459 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
460 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
465 return; /* no fractional digits */
468 /* adjust fractional portion from fractional to numerator
469 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
470 if (frac && end) { /* both are valid */
471 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
472 while(frac_digits < 6) { /* this is frac of 10^6 */
477 strict_time_adj.tv.tv_usec = (int)val;
481 set_rel_time(char *optarg_str_p)
490 /* skip leading whitespace */
491 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
494 /* ignore negative adjustment */
495 if (*optarg_str_p == '-')
498 /* collect whole number of seconds, if any */
499 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
503 val = strtol(optarg_str_p, &frac, 10);
504 if (frac == NULL || frac == optarg_str_p
505 || val == LONG_MIN || val == LONG_MAX) {
506 fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
510 if (val < 0) { /* implies '--' since we caught '-' above */
511 fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
516 relative_time_window.secs = val;
518 /* now collect the partial seconds, if any */
519 if (*frac != '\0') { /* chars left, so get fractional part */
520 val = strtol(&(frac[1]), &end, 10);
521 /* if more than 9 fractional digits truncate to 9 */
522 if ((end - &(frac[1])) > 9) {
523 frac[10] = 't'; /* 't' for truncate */
524 val = strtol(&(frac[1]), &end, 10);
526 if (*frac != '.' || end == NULL || end == frac || val < 0
527 || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
528 fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
533 return; /* no fractional digits */
536 /* adjust fractional portion from fractional to numerator
537 * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
538 if (frac && end) { /* both are valid */
539 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
540 while(frac_digits < 9) { /* this is frac of 10^9 */
545 relative_time_window.nsecs = (int)val;
549 is_duplicate(guint8* fd, guint32 len) {
554 if (cur_dup_entry >= dup_window)
557 /* Calculate our digest */
559 md5_append(&ms, fd, len);
560 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
562 fd_hash[cur_dup_entry].len = len;
564 /* Look for duplicates */
565 for (i = 0; i < dup_window; i++) {
566 if (i == cur_dup_entry)
569 if (fd_hash[i].len == fd_hash[cur_dup_entry].len
570 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
579 is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
584 if (cur_dup_entry >= dup_window)
587 /* Calculate our digest */
589 md5_append(&ms, fd, len);
590 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
592 fd_hash[cur_dup_entry].len = len;
593 fd_hash[cur_dup_entry].time.secs = current->secs;
594 fd_hash[cur_dup_entry].time.nsecs = current->nsecs;
597 * Look for relative time related duplicates.
598 * This is hopefully a reasonably efficient mechanism for
599 * finding duplicates by rel time in the fd_hash[] cache.
600 * We check starting from the most recently added hash
601 * entries and work backwards towards older packets.
602 * This approach allows the dup test to be terminated
603 * when the relative time of a cached entry is found to
604 * be beyond the dup time window.
606 * Of course this assumes that the input trace file is
607 * "well-formed" in the sense that the packet timestamps are
608 * in strict chronologically increasing order (which is NOT
609 * always the case!!).
611 * The fd_hash[] table was deliberatly created large (1,000,000).
612 * Looking for time related duplicates in large trace files with
613 * non-fractional dup time window values can potentially take
614 * a long time to complete.
617 for (i = cur_dup_entry - 1;; i--) {
624 if (i == cur_dup_entry) {
626 * We've decremented back to where we started.
632 if (nstime_is_unset(&(fd_hash[i].time))) {
634 * We've decremented to an unused fd_hash[] entry.
640 nstime_delta(&delta, current, &fd_hash[i].time);
642 if (delta.secs < 0 || delta.nsecs < 0) {
644 * A negative delta implies that the current packet
645 * has an absolute timestamp less than the cached packet
646 * that it is being compared to. This is NOT a normal
647 * situation since trace files usually have packets in
648 * chronological order (oldest to newest).
650 * There are several possible ways to deal with this:
651 * 1. 'continue' dup checking with the next cached frame.
652 * 2. 'break' from looking for a duplicate of the current frame.
653 * 3. Take the absolute value of the delta and see if that
654 * falls within the specifed dup time window.
656 * Currently this code does option 1. But it would pretty
657 * easy to add yet-another-editcap-option to select one of
658 * the other behaviors for dealing with out-of-sequence
664 cmp = nstime_cmp(&delta, &relative_time_window);
668 * The delta time indicates that we are now looking at
669 * cached packets beyond the specified dup time window.
673 } else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
674 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
683 usage(gboolean is_error)
692 fprintf(output, "Editcap %s"
694 " (" SVNVERSION " from " SVNPATH ")"
697 fprintf(output, "Edit and/or translate the format of capture files.\n");
698 fprintf(output, "See http://www.wireshark.org for more information.\n");
699 fprintf(output, "\n");
700 fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
701 fprintf(output, "\n");
702 fprintf(output, "<infile> and <outfile> must both be present.\n");
703 fprintf(output, "A single packet or a range of packets can be selected.\n");
704 fprintf(output, "\n");
705 fprintf(output, "Packet selection:\n");
706 fprintf(output, " -r keep the selected packets; default is to delete them.\n");
707 fprintf(output, " -A <start time> only output packets whose timestamp is after (or equal\n");
708 fprintf(output, " to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
709 fprintf(output, " -B <stop time> only output packets whose timestamp is before the\n");
710 fprintf(output, " given time (format as YYYY-MM-DD hh:mm:ss).\n");
711 fprintf(output, "\n");
712 fprintf(output, "Duplicate packet removal:\n");
713 fprintf(output, " -d remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
714 fprintf(output, " -D <dup window> remove packet if duplicate; configurable <dup window>\n");
715 fprintf(output, " Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
716 fprintf(output, " NOTE: A <dup window> of 0 with -v (verbose option) is\n");
717 fprintf(output, " useful to print MD5 hashes.\n");
718 fprintf(output, " -w <dup time window> remove packet if duplicate packet is found EQUAL TO OR\n");
719 fprintf(output, " LESS THAN <dup time window> prior to current packet.\n");
720 fprintf(output, " A <dup time window> is specified in relative seconds\n");
721 fprintf(output, " (e.g. 0.000001).\n");
722 fprintf(output, "\n");
723 fprintf(output, " NOTE: The use of the 'Duplicate packet removal' options with\n");
724 fprintf(output, " other editcap options except -v may not always work as expected.\n");
725 fprintf(output, " Specifically the -r, -t or -S options will very likely NOT have the\n");
726 fprintf(output, " desired effect if combined with the -d, -D or -w.\n");
727 fprintf(output, "\n");
728 fprintf(output, "Packet manipulation:\n");
729 fprintf(output, " -s <snaplen> truncate each packet to max. <snaplen> bytes of data.\n");
730 fprintf(output, " -C [offset:]<choplen> chop each packet by <choplen> bytes. Positive values\n");
731 fprintf(output, " chop at the packet beginning, negative values at the\n");
732 fprintf(output, " packet end. If an optional offset precedes the length,\n");
733 fprintf(output, " then the bytes chopped will be offset from that value.\n");
734 fprintf(output, " Positive offsets are from the packet beginning,\n");
735 fprintf(output, " negative offsets are from the packet end. You can use\n");
736 fprintf(output, " this option more than once, allowing up to 2 chopping\n");
737 fprintf(output, " regions within a packet provided that at least 1\n");
738 fprintf(output, " choplen is positive and at least 1 is negative.\n");
739 fprintf(output, " -L adjust the frame length when chopping and/or snapping\n");
740 fprintf(output, " -t <time adjustment> adjust the timestamp of each packet;\n");
741 fprintf(output, " <time adjustment> is in relative seconds (e.g. -0.5).\n");
742 fprintf(output, " -S <strict adjustment> adjust timestamp of packets if necessary to insure\n");
743 fprintf(output, " strict chronological increasing order. The <strict\n");
744 fprintf(output, " adjustment> is specified in relative seconds with\n");
745 fprintf(output, " values of 0 or 0.000001 being the most reasonable.\n");
746 fprintf(output, " A negative adjustment value will modify timestamps so\n");
747 fprintf(output, " that each packet's delta time is the absolute value\n");
748 fprintf(output, " of the adjustment specified. A value of -0 will set\n");
749 fprintf(output, " all packets to the timestamp of the first packet.\n");
750 fprintf(output, " -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
751 fprintf(output, " a particular packet byte will be randomly changed.\n");
752 fprintf(output, "\n");
753 fprintf(output, "Output File(s):\n");
754 fprintf(output, " -c <packets per file> split the packet output to different files based on\n");
755 fprintf(output, " uniform packet counts with a maximum of\n");
756 fprintf(output, " <packets per file> each.\n");
757 fprintf(output, " -i <seconds per file> split the packet output to different files based on\n");
758 fprintf(output, " uniform time intervals with a maximum of\n");
759 fprintf(output, " <seconds per file> each.\n");
760 fprintf(output, " -F <capture type> set the output file type; default is pcapng. An empty\n");
761 fprintf(output, " \"-F\" option will list the file types.\n");
762 fprintf(output, " -T <encap type> set the output file encapsulation type; default is the\n");
763 fprintf(output, " same as the input file. An empty \"-T\" option will\n");
764 fprintf(output, " list the encapsulation types.\n");
765 fprintf(output, "\n");
766 fprintf(output, "Miscellaneous:\n");
767 fprintf(output, " -h display this help and exit.\n");
768 fprintf(output, " -v verbose output.\n");
769 fprintf(output, " If -v is used with any of the 'Duplicate Packet\n");
770 fprintf(output, " Removal' options (-d, -D or -w) then Packet lengths\n");
771 fprintf(output, " and MD5 hashes are printed to standard-out.\n");
772 fprintf(output, "\n");
776 const char *sstr; /* The short string */
777 const char *lstr; /* The long string */
781 string_compare(gconstpointer a, gconstpointer b)
783 return strcmp(((const struct string_elem *)a)->sstr,
784 ((const struct string_elem *)b)->sstr);
788 string_nat_compare(gconstpointer a, gconstpointer b)
790 return strnatcmp(((const struct string_elem *)a)->sstr,
791 ((const struct string_elem *)b)->sstr);
795 string_elem_print(gpointer data, gpointer not_used _U_)
797 fprintf(stderr, " %s - %s\n",
798 ((struct string_elem *)data)->sstr,
799 ((struct string_elem *)data)->lstr);
803 list_capture_types(void) {
805 struct string_elem *captypes;
808 captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES);
809 fprintf(stderr, "editcap: The available capture file types for the \"-F\" flag are:\n");
810 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
811 if (wtap_dump_can_open(i)) {
812 captypes[i].sstr = wtap_file_type_short_string(i);
813 captypes[i].lstr = wtap_file_type_string(i);
814 list = g_slist_insert_sorted(list, &captypes[i], string_compare);
817 g_slist_foreach(list, string_elem_print, NULL);
823 list_encap_types(void) {
825 struct string_elem *encaps;
828 encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
829 fprintf(stderr, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
830 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
831 encaps[i].sstr = wtap_encap_short_string(i);
832 if (encaps[i].sstr != NULL) {
833 encaps[i].lstr = wtap_encap_string(i);
834 list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
837 g_slist_foreach(list, string_elem_print, NULL);
844 * Don't report failures to load plugins because most (non-wiretap) plugins
845 * *should* fail to load (because we're not linked against libwireshark and
846 * dissector plugins need libwireshark).
849 failure_message(const char *msg_format _U_, va_list ap _U_)
855 main(int argc, char *argv[])
863 guint32 snaplen = 0; /* No limit */
864 chop_t chop = {0, 0, 0, 0, 0, 0}; /* No chop */
865 gboolean adjlen = FALSE;
866 wtap_dumper *pdh = NULL;
867 unsigned int count = 1;
868 unsigned int duplicate_count = 0;
870 struct wtap_pkthdr snap_phdr;
871 const struct wtap_pkthdr *phdr;
873 wtapng_section_t *shb_hdr;
874 wtapng_iface_descriptions_t *idb_inf;
876 guint32 read_count = 0;
877 int split_packet_count = 0;
878 int written_count = 0;
879 char *filename = NULL;
880 gboolean ts_okay = TRUE;
881 int secs_per_block = 0;
883 nstime_t block_start;
884 gchar *fprefix = NULL;
885 gchar *fsuffix = NULL;
889 char* init_progfile_dir_error;
893 arg_list_utf_16to8(argc, argv);
894 create_app_running_mutex();
898 * Get credential information for later use.
900 init_process_policies();
903 /* Register wiretap plugins */
904 if ((init_progfile_dir_error = init_progfile_dir(argv[0], main))) {
905 g_warning("editcap: init_progfile_dir(): %s", init_progfile_dir_error);
906 g_free(init_progfile_dir_error);
908 init_report_err(failure_message,NULL,NULL,NULL);
913 /* Process the options */
914 while ((opt = getopt(argc, argv, "A:B:c:C:dD:E:F:hi:Lrs:S:t:T:vw:")) != -1) {
920 memset(&starttm,0,sizeof(struct tm));
922 if (!strptime(optarg,"%Y-%m-%d %T", &starttm)) {
923 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
928 check_startstop = TRUE;
929 starttm.tm_isdst = -1;
931 starttime = mktime(&starttm);
939 memset(&stoptm,0,sizeof(struct tm));
941 if (!strptime(optarg,"%Y-%m-%d %T", &stoptm)) {
942 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
946 check_startstop = TRUE;
947 stoptm.tm_isdst = -1;
948 stoptime = mktime(&stoptm);
953 split_packet_count = (int)strtol(optarg, &p, 10);
954 if (p == optarg || *p != '\0') {
955 fprintf(stderr, "editcap: \"%s\" isn't a valid packet count\n",
959 if (split_packet_count <= 0) {
960 fprintf(stderr, "editcap: \"%d\" packet count must be larger than zero\n",
968 int choplen = 0, chopoff = 0;
970 switch (sscanf(optarg, "%d:%d", &chopoff, &choplen)) {
971 case 1: /* only the chop length was specififed */
976 case 2: /* both an offset and chop length was specified */
980 fprintf(stderr, "editcap: \"%s\" isn't a valid chop length or offset:length\n",
987 chop.len_begin += choplen;
989 chop.off_begin_pos += chopoff;
991 chop.off_begin_neg += chopoff;
992 } else if (choplen < 0) {
993 chop.len_end += choplen;
995 chop.off_end_pos += chopoff;
997 chop.off_end_neg += chopoff;
1004 dup_detect_by_time = FALSE;
1005 dup_window = DEFAULT_DUP_DEPTH;
1010 dup_detect_by_time = FALSE;
1011 dup_window = (int)strtol(optarg, &p, 10);
1012 if (p == optarg || *p != '\0') {
1013 fprintf(stderr, "editcap: \"%s\" isn't a valid duplicate window value\n",
1017 if (dup_window < 0 || dup_window > MAX_DUP_DEPTH) {
1018 fprintf(stderr, "editcap: \"%d\" duplicate window value must be between 0 and %d inclusive.\n",
1019 dup_window, MAX_DUP_DEPTH);
1025 err_prob = strtod(optarg, &p);
1026 if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
1027 fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
1031 srand( (unsigned int) (time(NULL) + getpid()) );
1035 out_file_type = wtap_short_string_to_file_type(optarg);
1036 if (out_file_type < 0) {
1037 fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
1039 list_capture_types();
1049 case 'i': /* break capture file based on time interval */
1050 secs_per_block = atoi(optarg);
1051 if (secs_per_block <= 0) {
1052 fprintf(stderr, "editcap: \"%s\" isn't a valid time interval\n\n",
1063 keep_em = !keep_em; /* Just invert */
1067 snaplen = (guint32)strtol(optarg, &p, 10);
1068 if (p == optarg || *p != '\0') {
1069 fprintf(stderr, "editcap: \"%s\" isn't a valid snapshot length\n",
1076 set_strict_time_adj(optarg);
1077 do_strict_time_adjustment = TRUE;
1081 set_time_adjustment(optarg);
1085 out_frame_type = wtap_short_string_to_encap(optarg);
1086 if (out_frame_type < 0) {
1087 fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
1095 verbose = !verbose; /* Just invert */
1100 dup_detect_by_time = TRUE;
1101 dup_window = MAX_DUP_DEPTH;
1102 set_rel_time(optarg);
1105 case '?': /* Bad options if GNU getopt */
1108 list_capture_types();
1123 printf("Optind = %i, argc = %i\n", optind, argc);
1126 if ((argc - optind) < 1) {
1131 if (check_startstop && !stoptime) {
1134 /* XXX: will work until 2035 */
1135 memset(&stoptm,0,sizeof(struct tm));
1136 stoptm.tm_year = 135;
1137 stoptm.tm_mday = 31;
1140 stoptime = mktime(&stoptm);
1143 nstime_set_unset(&block_start);
1145 if (starttime > stoptime) {
1146 fprintf(stderr, "editcap: start time is after the stop time\n");
1150 if (split_packet_count > 0 && secs_per_block > 0) {
1151 fprintf(stderr, "editcap: can't split on both packet count and time interval\n");
1152 fprintf(stderr, "editcap: at the same time\n");
1156 wth = wtap_open_offline(argv[optind], &err, &err_info, FALSE);
1159 fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
1160 wtap_strerror(err));
1162 case WTAP_ERR_UNSUPPORTED:
1163 case WTAP_ERR_UNSUPPORTED_ENCAP:
1164 case WTAP_ERR_BAD_FILE:
1165 fprintf(stderr, "(%s)\n", err_info);
1173 fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
1174 wtap_file_type_string(wtap_file_type(wth)));
1177 shb_hdr = wtap_file_get_shb_info(wth);
1178 idb_inf = wtap_file_get_idb_info(wth);
1181 * Now, process the rest, if any ... we only write if there is an extra
1182 * argument or so ...
1185 if ((argc - optind) >= 2) {
1186 if (out_frame_type == -2)
1187 out_frame_type = wtap_file_encap(wth);
1189 for (i = optind + 2; i < argc; i++)
1190 if (add_selection(argv[i]) == FALSE)
1193 if (dup_detect || dup_detect_by_time) {
1194 for (i = 0; i < dup_window; i++) {
1195 memset(&fd_hash[i].digest, 0, 16);
1197 nstime_set_unset(&fd_hash[i].time);
1201 while (wtap_read(wth, &err, &err_info, &data_offset)) {
1204 phdr = wtap_phdr(wth);
1205 buf = wtap_buf_ptr(wth);
1207 if (nstime_is_unset(&block_start)) { /* should only be the first packet */
1208 block_start.secs = phdr->ts.secs;
1209 block_start.nsecs = phdr->ts.nsecs;
1211 if (split_packet_count > 0 || secs_per_block > 0) {
1212 if (!fileset_extract_prefix_suffix(argv[optind+1], &fprefix, &fsuffix))
1215 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1217 filename = g_strdup(argv[optind+1]);
1220 /* If we don't have an application name add Editcap */
1221 if (shb_hdr->shb_user_appl == NULL) {
1222 g_snprintf(appname, sizeof(appname), "Editcap " VERSION);
1223 shb_hdr->shb_user_appl = appname;
1226 pdh = wtap_dump_open_ng(filename, out_file_type, out_frame_type,
1227 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1228 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1231 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1232 filename, wtap_strerror(err));
1239 if (secs_per_block > 0) {
1240 while ((phdr->ts.secs - block_start.secs > secs_per_block)
1241 || (phdr->ts.secs - block_start.secs == secs_per_block
1242 && phdr->ts.nsecs >= block_start.nsecs )) { /* time for the next file */
1244 if (!wtap_dump_close(pdh, &err)) {
1245 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1246 filename, wtap_strerror(err));
1249 block_start.secs = block_start.secs + secs_per_block; /* reset for next interval */
1251 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1255 fprintf(stderr, "Continuing writing in file %s\n", filename);
1257 pdh = wtap_dump_open_ng(filename, out_file_type, out_frame_type,
1258 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1259 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1262 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1263 filename, wtap_strerror(err));
1269 if (split_packet_count > 0) {
1270 /* time for the next file? */
1271 if (written_count > 0 && written_count % split_packet_count == 0) {
1272 if (!wtap_dump_close(pdh, &err)) {
1273 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1274 filename, wtap_strerror(err));
1279 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1283 fprintf(stderr, "Continuing writing in file %s\n", filename);
1285 pdh = wtap_dump_open_ng(filename, out_file_type, out_frame_type,
1286 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1287 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1289 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1290 filename, wtap_strerror(err));
1296 if (check_startstop)
1297 ts_okay = check_timestamp(wth);
1299 if (ts_okay && ((!selected(count) && !keep_em)
1300 || (selected(count) && keep_em))) {
1302 if (verbose && !dup_detect && !dup_detect_by_time)
1303 printf("Packet: %u\n", count);
1305 /* We simply write it, perhaps after truncating it; we could
1306 * do other things, like modify it. */
1308 phdr = wtap_phdr(wth);
1311 if (phdr->caplen > snaplen) {
1313 snap_phdr.caplen = snaplen;
1316 if (adjlen && phdr->len > snaplen) {
1318 snap_phdr.len = snaplen;
1325 handle_chopping(chop, &snap_phdr, phdr, buf, adjlen);
1328 /* Do we adjust timestamps to ensure strict chronological
1330 if (do_strict_time_adjustment) {
1331 if (previous_time.secs || previous_time.nsecs) {
1332 if (!strict_time_adj.is_negative) {
1336 current.secs = phdr->ts.secs;
1337 current.nsecs = phdr->ts.nsecs;
1339 nstime_delta(&delta, ¤t, &previous_time);
1341 if (delta.secs < 0 || delta.nsecs < 0) {
1343 * A negative delta indicates that the current packet
1344 * has an absolute timestamp less than the previous packet
1345 * that it is being compared to. This is NOT a normal
1346 * situation since trace files usually have packets in
1347 * chronological order (oldest to newest).
1349 /* printf("++out of order, need to adjust this packet!\n"); */
1351 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1352 snap_phdr.ts.nsecs = previous_time.nsecs;
1353 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1355 snap_phdr.ts.secs++;
1356 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1358 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1364 * A negative strict time adjustment is requested.
1365 * Unconditionally set each timestamp to previous
1366 * packet's timestamp plus delta.
1369 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1370 snap_phdr.ts.nsecs = previous_time.nsecs;
1371 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1373 snap_phdr.ts.secs++;
1374 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1376 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1381 previous_time.secs = phdr->ts.secs;
1382 previous_time.nsecs = phdr->ts.nsecs;
1385 /* assume that if the frame's tv_sec is 0, then
1386 * the timestamp isn't supported */
1387 if (phdr->ts.secs > 0 && time_adj.tv.tv_sec != 0) {
1389 if (time_adj.is_negative)
1390 snap_phdr.ts.secs -= time_adj.tv.tv_sec;
1392 snap_phdr.ts.secs += time_adj.tv.tv_sec;
1396 /* assume that if the frame's tv_sec is 0, then
1397 * the timestamp isn't supported */
1398 if (phdr->ts.secs > 0 && time_adj.tv.tv_usec != 0) {
1400 if (time_adj.is_negative) { /* subtract */
1401 if (snap_phdr.ts.nsecs/1000 < time_adj.tv.tv_usec) { /* borrow */
1402 snap_phdr.ts.secs--;
1403 snap_phdr.ts.nsecs += ONE_MILLION * 1000;
1405 snap_phdr.ts.nsecs -= time_adj.tv.tv_usec * 1000;
1407 if (snap_phdr.ts.nsecs + time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1409 snap_phdr.ts.secs++;
1410 snap_phdr.ts.nsecs += (time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1412 snap_phdr.ts.nsecs += time_adj.tv.tv_usec * 1000;
1418 /* suppress duplicates by packet window */
1420 if (is_duplicate(buf, phdr->caplen)) {
1422 fprintf(stdout, "Skipped: %u, Len: %u, MD5 Hash: ",
1423 count, phdr->caplen);
1424 for (i = 0; i < 16; i++)
1425 fprintf(stdout, "%02x",
1426 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1427 fprintf(stdout, "\n");
1434 fprintf(stdout, "Packet: %u, Len: %u, MD5 Hash: ",
1435 count, phdr->caplen);
1436 for (i = 0; i < 16; i++)
1437 fprintf(stdout, "%02x",
1438 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1439 fprintf(stdout, "\n");
1444 /* suppress duplicates by time window */
1445 if (dup_detect_by_time) {
1448 current.secs = phdr->ts.secs;
1449 current.nsecs = phdr->ts.nsecs;
1451 if (is_duplicate_rel_time(buf, phdr->caplen, ¤t)) {
1453 fprintf(stdout, "Skipped: %u, Len: %u, MD5 Hash: ",
1454 count, phdr->caplen);
1455 for (i = 0; i < 16; i++)
1456 fprintf(stdout, "%02x",
1457 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1458 fprintf(stdout, "\n");
1465 fprintf(stdout, "Packet: %u, Len: %u, MD5 Hash: ",
1466 count, phdr->caplen);
1467 for (i = 0; i < 16; i++)
1468 fprintf(stdout, "%02x",
1469 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1470 fprintf(stdout, "\n");
1475 /* Random error mutation */
1476 if (err_prob > 0.0) {
1477 int real_data_start = 0;
1479 /* Protect non-protocol data */
1480 if (wtap_file_type(wth) == WTAP_FILE_CATAPULT_DCT2000)
1481 real_data_start = find_dct2000_real_data(buf);
1483 for (i = real_data_start; i < (int) phdr->caplen; i++) {
1484 if (rand() <= err_prob * RAND_MAX) {
1485 err_type = rand() / (RAND_MAX / ERR_WT_TOTAL + 1);
1487 if (err_type < ERR_WT_BIT) {
1488 buf[i] ^= 1 << (rand() / (RAND_MAX / 8 + 1));
1489 err_type = ERR_WT_TOTAL;
1491 err_type -= ERR_WT_BYTE;
1494 if (err_type < ERR_WT_BYTE) {
1495 buf[i] = rand() / (RAND_MAX / 255 + 1);
1496 err_type = ERR_WT_TOTAL;
1498 err_type -= ERR_WT_BYTE;
1501 if (err_type < ERR_WT_ALNUM) {
1502 buf[i] = ALNUM_CHARS[rand() / (RAND_MAX / ALNUM_LEN + 1)];
1503 err_type = ERR_WT_TOTAL;
1505 err_type -= ERR_WT_ALNUM;
1508 if (err_type < ERR_WT_FMT) {
1509 if ((unsigned int)i < phdr->caplen - 2)
1510 g_strlcpy((char*) &buf[i], "%s", 2);
1511 err_type = ERR_WT_TOTAL;
1513 err_type -= ERR_WT_FMT;
1516 if (err_type < ERR_WT_AA) {
1517 for (j = i; j < (int) phdr->caplen; j++)
1525 if (!wtap_dump(pdh, phdr, buf, &err)) {
1527 case WTAP_ERR_UNSUPPORTED_ENCAP:
1529 * This is a problem with the particular frame we're
1530 * writing; note that, and give the frame number.
1533 "editcap: Frame %u of \"%s\" has a network type that can't be saved in a file with that format\n.",
1534 read_count, argv[optind]);
1538 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1539 filename, wtap_strerror(err));
1553 /* Print a message noting that the read failed somewhere along the
1556 "editcap: An error occurred while reading \"%s\": %s.\n",
1557 argv[optind], wtap_strerror(err));
1559 case WTAP_ERR_UNSUPPORTED:
1560 case WTAP_ERR_UNSUPPORTED_ENCAP:
1561 case WTAP_ERR_BAD_FILE:
1562 fprintf(stderr, "(%s)\n", err_info);
1569 /* No valid packages found, open the outfile so we can write an
1572 filename = g_strdup(argv[optind+1]);
1574 pdh = wtap_dump_open_ng(filename, out_file_type, out_frame_type,
1575 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)): wtap_snapshot_length(wth),
1576 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1578 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1579 filename, wtap_strerror(err));
1587 if (!wtap_dump_close(pdh, &err)) {
1588 fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
1589 wtap_strerror(err));
1597 fprintf(stdout, "%u packet%s seen, %u packet%s skipped with duplicate window of %u packets.\n",
1598 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1599 plurality(duplicate_count, "", "s"), dup_window);
1600 } else if (dup_detect_by_time) {
1601 fprintf(stdout, "%u packet%s seen, %u packet%s skipped with duplicate time window equal to or less than %ld.%09ld seconds.\n",
1602 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1603 plurality(duplicate_count, "", "s"),
1604 (long)relative_time_window.secs,
1605 (long int)relative_time_window.nsecs);
1611 /* Skip meta-information read from file to return offset of real
1614 find_dct2000_real_data(guint8 *buf)
1618 for (n = 0; buf[n] != '\0'; n++); /* Context name */
1620 n++; /* Context port number */
1621 for (; buf[n] != '\0'; n++); /* Timestamp */
1623 for (; buf[n] != '\0'; n++); /* Protocol name */
1625 for (; buf[n] != '\0'; n++); /* Variant number (as string) */
1627 for (; buf[n] != '\0'; n++); /* Outhdr (as string) */
1629 n += 2; /* Direction & encap */
1635 * We support up to 2 chopping regions in a single pas, one specified by the
1636 * positive chop length, and one by the negative chop length.
1639 handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
1640 const struct wtap_pkthdr *in_phdr, guint8 *buf,
1643 /* If we're not chopping anything from one side, then the offset for that
1644 * side is meaningless. */
1645 if (chop.len_begin == 0)
1646 chop.off_begin_pos = chop.off_begin_neg = 0;
1647 if (chop.len_end == 0)
1648 chop.off_end_pos = chop.off_end_neg = 0;
1650 if (chop.off_begin_neg < 0) {
1651 chop.off_begin_pos += in_phdr->caplen + chop.off_begin_neg;
1652 chop.off_begin_neg = 0;
1654 if (chop.off_end_pos > 0) {
1655 chop.off_end_neg += chop.off_end_pos - in_phdr->caplen;
1656 chop.off_end_pos = 0;
1659 /* If we've crossed chopping regions, swap them */
1660 if (chop.len_begin && chop.len_end) {
1661 if (chop.off_begin_pos > ((int)in_phdr->caplen + chop.off_end_neg)) {
1662 int tmp_len, tmp_off;
1664 tmp_off = in_phdr->caplen + chop.off_end_neg + chop.len_end;
1665 tmp_len = -chop.len_end;
1667 chop.off_end_neg = chop.len_begin + chop.off_begin_pos - in_phdr->caplen;
1668 chop.len_end = -chop.len_begin;
1670 chop.len_begin = tmp_len;
1671 chop.off_begin_pos = tmp_off;
1675 /* Make sure we don't chop off more than we have available */
1676 if (in_phdr->caplen < (guint32)(chop.off_begin_pos - chop.off_end_neg)) {
1680 if ((guint32)(chop.len_begin - chop.len_end) >
1681 (in_phdr->caplen - (guint32)(chop.off_begin_pos - chop.off_end_neg))) {
1682 chop.len_begin = in_phdr->caplen - (chop.off_begin_pos - chop.off_end_neg);
1686 /* Handle chopping from the beginning. Note that if a beginning offset
1687 * was specified, we need to keep that piece */
1688 if (chop.len_begin > 0) {
1689 *out_phdr = *in_phdr;
1691 if (chop.off_begin_pos > 0) {
1692 memmove(&buf[chop.off_begin_pos],
1693 &buf[chop.off_begin_pos + chop.len_begin],
1694 out_phdr->caplen - chop.len_begin);
1696 buf += chop.len_begin;
1698 out_phdr->caplen -= chop.len_begin;
1701 if (in_phdr->len > (guint32)chop.len_begin)
1702 out_phdr->len -= chop.len_begin;
1709 /* Handle chopping from the end. Note that if an ending offset was
1710 * specified, we need to keep that piece */
1711 if (chop.len_end < 0) {
1712 *out_phdr = *in_phdr;
1714 if (chop.off_end_neg < 0) {
1715 memmove(&buf[(gint)out_phdr->caplen + (chop.len_end + chop.off_end_neg)],
1716 &buf[(gint)out_phdr->caplen + chop.off_end_neg],
1719 out_phdr->caplen += chop.len_end;
1722 if (((signed int) in_phdr->len + chop.len_end) > 0)
1723 out_phdr->len += chop.len_end;
1727 /*in_phdr = out_phdr;*/
1732 * Editor modelines - http://www.wireshark.org/tools/modelines.html
1737 * indent-tabs-mode: nil
1740 * vi: set shiftwidth=4 tabstop=4 expandtab:
1741 * :indentSize=4:tabSize=4:noTabs=true: