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 #if (defined _WIN32) && (_MSC_VER < 1500)
180 /* calling localtime() on MSVC 2005 with huge values causes it to crash */
181 /* XXX - find the exact value that still does work */
182 /* XXX - using _USE_32BIT_TIME_T might be another way to circumvent this problem */
183 if (abs_time->secs > 2000000000)
187 tmp = localtime(&abs_time->secs);
190 g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
205 fileset_get_filename_by_pattern(guint idx, const nstime_t *time_val,
206 gchar *fprefix, gchar *fsuffix)
212 timestr = abs_time_to_str_with_sec_resolution(time_val);
213 g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
214 abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
221 fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
223 char *pfx, *last_pathsep;
226 save_file = g_strdup(fname);
227 if (save_file == NULL) {
228 fprintf(stderr, "editcap: Out of memory\n");
232 last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
233 pfx = strrchr(save_file,'.');
234 if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
235 /* The pathname has a "." in it, and it's in the last component
236 * of the pathname (because there is either only one component,
237 * i.e. last_pathsep is null as there are no path separators,
238 * or the "." is after the path separator before the last
241 * Treat it as a separator between the rest of the file name and
242 * the file name suffix, and arrange that the names given to the
243 * ring buffer files have the specified suffix, i.e. put the
244 * changing part of the name *before* the suffix. */
246 *fprefix = g_strdup(save_file);
247 pfx[0] = '.'; /* restore capfile_name */
248 *fsuffix = g_strdup(pfx);
250 /* Either there's no "." in the pathname, or it's in a directory
251 * component, so the last component has no suffix. */
252 *fprefix = g_strdup(save_file);
259 /* Add a selection item, a simple parser for now */
261 add_selection(char *sel)
266 if (++max_selected >= MAX_SELECTIONS) {
267 /* Let the user know we stopped selecting */
268 fprintf(stderr, "Out of room for packet selections!\n");
273 fprintf(stderr, "Add_Selected: %s\n", sel);
275 if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
277 fprintf(stderr, "Not inclusive ...");
279 selectfrm[max_selected].inclusive = 0;
280 selectfrm[max_selected].first = atoi(sel);
283 fprintf(stderr, " %i\n", selectfrm[max_selected].first);
286 fprintf(stderr, "Inclusive ...");
289 selectfrm[max_selected].inclusive = 1;
290 selectfrm[max_selected].first = atoi(sel);
291 selectfrm[max_selected].second = atoi(next);
294 fprintf(stderr, " %i, %i\n", selectfrm[max_selected].first,
295 selectfrm[max_selected].second);
301 /* Was the packet selected? */
308 for (i = 0; i <= max_selected; i++) {
309 if (selectfrm[i].inclusive) {
310 if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
313 if (recno == selectfrm[i].first)
321 /* is the packet in the selected timeframe */
323 check_timestamp(wtap *wth)
325 struct wtap_pkthdr* pkthdr = wtap_phdr(wth);
327 return (pkthdr->ts.secs >= starttime) && (pkthdr->ts.secs < stoptime);
331 set_time_adjustment(char *optarg_str_p)
340 /* skip leading whitespace */
341 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
344 /* check for a negative adjustment */
345 if (*optarg_str_p == '-') {
346 time_adj.is_negative = 1;
350 /* collect whole number of seconds, if any */
351 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
355 val = strtol(optarg_str_p, &frac, 10);
356 if (frac == NULL || frac == optarg_str_p
357 || val == LONG_MIN || val == LONG_MAX) {
358 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
362 if (val < 0) { /* implies '--' since we caught '-' above */
363 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
368 time_adj.tv.tv_sec = val;
370 /* now collect the partial seconds, if any */
371 if (*frac != '\0') { /* chars left, so get fractional part */
372 val = strtol(&(frac[1]), &end, 10);
373 /* if more than 6 fractional digits truncate to 6 */
374 if ((end - &(frac[1])) > 6) {
375 frac[7] = 't'; /* 't' for truncate */
376 val = strtol(&(frac[1]), &end, 10);
378 if (*frac != '.' || end == NULL || end == frac || val < 0
379 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
380 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
385 return; /* no fractional digits */
388 /* adjust fractional portion from fractional to numerator
389 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
390 if (frac && end) { /* both are valid */
391 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
392 while(frac_digits < 6) { /* this is frac of 10^6 */
397 time_adj.tv.tv_usec = (int)val;
401 set_strict_time_adj(char *optarg_str_p)
410 /* skip leading whitespace */
411 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
415 * check for a negative adjustment
416 * A negative strict adjustment value is a flag
417 * to adjust all frames by the specifed delta time.
419 if (*optarg_str_p == '-') {
420 strict_time_adj.is_negative = 1;
424 /* collect whole number of seconds, if any */
425 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
429 val = strtol(optarg_str_p, &frac, 10);
430 if (frac == NULL || frac == optarg_str_p
431 || val == LONG_MIN || val == LONG_MAX) {
432 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
436 if (val < 0) { /* implies '--' since we caught '-' above */
437 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
442 strict_time_adj.tv.tv_sec = val;
444 /* now collect the partial seconds, if any */
445 if (*frac != '\0') { /* chars left, so get fractional part */
446 val = strtol(&(frac[1]), &end, 10);
447 /* if more than 6 fractional digits truncate to 6 */
448 if ((end - &(frac[1])) > 6) {
449 frac[7] = 't'; /* 't' for truncate */
450 val = strtol(&(frac[1]), &end, 10);
452 if (*frac != '.' || end == NULL || end == frac || val < 0
453 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
454 fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
459 return; /* no fractional digits */
462 /* adjust fractional portion from fractional to numerator
463 * e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
464 if (frac && end) { /* both are valid */
465 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
466 while(frac_digits < 6) { /* this is frac of 10^6 */
471 strict_time_adj.tv.tv_usec = (int)val;
475 set_rel_time(char *optarg_str_p)
484 /* skip leading whitespace */
485 while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
488 /* ignore negative adjustment */
489 if (*optarg_str_p == '-')
492 /* collect whole number of seconds, if any */
493 if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
497 val = strtol(optarg_str_p, &frac, 10);
498 if (frac == NULL || frac == optarg_str_p
499 || val == LONG_MIN || val == LONG_MAX) {
500 fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
504 if (val < 0) { /* implies '--' since we caught '-' above */
505 fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
510 relative_time_window.secs = val;
512 /* now collect the partial seconds, if any */
513 if (*frac != '\0') { /* chars left, so get fractional part */
514 val = strtol(&(frac[1]), &end, 10);
515 /* if more than 9 fractional digits truncate to 9 */
516 if ((end - &(frac[1])) > 9) {
517 frac[10] = 't'; /* 't' for truncate */
518 val = strtol(&(frac[1]), &end, 10);
520 if (*frac != '.' || end == NULL || end == frac || val < 0
521 || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
522 fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
527 return; /* no fractional digits */
530 /* adjust fractional portion from fractional to numerator
531 * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
532 if (frac && end) { /* both are valid */
533 frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
534 while(frac_digits < 9) { /* this is frac of 10^9 */
539 relative_time_window.nsecs = (int)val;
543 is_duplicate(guint8* fd, guint32 len) {
548 if (cur_dup_entry >= dup_window)
551 /* Calculate our digest */
553 md5_append(&ms, fd, len);
554 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
556 fd_hash[cur_dup_entry].len = len;
558 /* Look for duplicates */
559 for (i = 0; i < dup_window; i++) {
560 if (i == cur_dup_entry)
563 if (fd_hash[i].len == fd_hash[cur_dup_entry].len
564 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
573 is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
578 if (cur_dup_entry >= dup_window)
581 /* Calculate our digest */
583 md5_append(&ms, fd, len);
584 md5_finish(&ms, fd_hash[cur_dup_entry].digest);
586 fd_hash[cur_dup_entry].len = len;
587 fd_hash[cur_dup_entry].time.secs = current->secs;
588 fd_hash[cur_dup_entry].time.nsecs = current->nsecs;
591 * Look for relative time related duplicates.
592 * This is hopefully a reasonably efficient mechanism for
593 * finding duplicates by rel time in the fd_hash[] cache.
594 * We check starting from the most recently added hash
595 * entries and work backwards towards older packets.
596 * This approach allows the dup test to be terminated
597 * when the relative time of a cached entry is found to
598 * be beyond the dup time window.
600 * Of course this assumes that the input trace file is
601 * "well-formed" in the sense that the packet timestamps are
602 * in strict chronologically increasing order (which is NOT
603 * always the case!!).
605 * The fd_hash[] table was deliberatly created large (1,000,000).
606 * Looking for time related duplicates in large trace files with
607 * non-fractional dup time window values can potentially take
608 * a long time to complete.
611 for (i = cur_dup_entry - 1;; i--) {
618 if (i == cur_dup_entry) {
620 * We've decremented back to where we started.
626 if (nstime_is_unset(&(fd_hash[i].time))) {
628 * We've decremented to an unused fd_hash[] entry.
634 nstime_delta(&delta, current, &fd_hash[i].time);
636 if (delta.secs < 0 || delta.nsecs < 0) {
638 * A negative delta implies that the current packet
639 * has an absolute timestamp less than the cached packet
640 * that it is being compared to. This is NOT a normal
641 * situation since trace files usually have packets in
642 * chronological order (oldest to newest).
644 * There are several possible ways to deal with this:
645 * 1. 'continue' dup checking with the next cached frame.
646 * 2. 'break' from looking for a duplicate of the current frame.
647 * 3. Take the absolute value of the delta and see if that
648 * falls within the specifed dup time window.
650 * Currently this code does option 1. But it would pretty
651 * easy to add yet-another-editcap-option to select one of
652 * the other behaviors for dealing with out-of-sequence
658 cmp = nstime_cmp(&delta, &relative_time_window);
662 * The delta time indicates that we are now looking at
663 * cached packets beyond the specified dup time window.
667 } else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
668 && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
677 usage(gboolean is_error)
686 fprintf(output, "Editcap %s"
688 " (" SVNVERSION " from " SVNPATH ")"
691 fprintf(output, "Edit and/or translate the format of capture files.\n");
692 fprintf(output, "See http://www.wireshark.org for more information.\n");
693 fprintf(output, "\n");
694 fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
695 fprintf(output, "\n");
696 fprintf(output, "<infile> and <outfile> must both be present.\n");
697 fprintf(output, "A single packet or a range of packets can be selected.\n");
698 fprintf(output, "\n");
699 fprintf(output, "Packet selection:\n");
700 fprintf(output, " -r keep the selected packets; default is to delete them.\n");
701 fprintf(output, " -A <start time> only output packets whose timestamp is after (or equal\n");
702 fprintf(output, " to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
703 fprintf(output, " -B <stop time> only output packets whose timestamp is before the\n");
704 fprintf(output, " given time (format as YYYY-MM-DD hh:mm:ss).\n");
705 fprintf(output, "\n");
706 fprintf(output, "Duplicate packet removal:\n");
707 fprintf(output, " -d remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
708 fprintf(output, " -D <dup window> remove packet if duplicate; configurable <dup window>\n");
709 fprintf(output, " Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
710 fprintf(output, " NOTE: A <dup window> of 0 with -v (verbose option) is\n");
711 fprintf(output, " useful to print MD5 hashes.\n");
712 fprintf(output, " -w <dup time window> remove packet if duplicate packet is found EQUAL TO OR\n");
713 fprintf(output, " LESS THAN <dup time window> prior to current packet.\n");
714 fprintf(output, " A <dup time window> is specified in relative seconds\n");
715 fprintf(output, " (e.g. 0.000001).\n");
716 fprintf(output, "\n");
717 fprintf(output, " NOTE: The use of the 'Duplicate packet removal' options with\n");
718 fprintf(output, " other editcap options except -v may not always work as expected.\n");
719 fprintf(output, " Specifically the -r, -t or -S options will very likely NOT have the\n");
720 fprintf(output, " desired effect if combined with the -d, -D or -w.\n");
721 fprintf(output, "\n");
722 fprintf(output, "Packet manipulation:\n");
723 fprintf(output, " -s <snaplen> truncate each packet to max. <snaplen> bytes of data.\n");
724 fprintf(output, " -C [offset:]<choplen> chop each packet by <choplen> bytes. Positive values\n");
725 fprintf(output, " chop at the packet beginning, negative values at the\n");
726 fprintf(output, " packet end. If an optional offset precedes the length,\n");
727 fprintf(output, " then the bytes chopped will be offset from that value.\n");
728 fprintf(output, " Positive offsets are from the packet beginning,\n");
729 fprintf(output, " negative offsets are from the packet end. You can use\n");
730 fprintf(output, " this option more than once, allowing up to 2 chopping\n");
731 fprintf(output, " regions within a packet provided that at least 1\n");
732 fprintf(output, " choplen is positive and at least 1 is negative.\n");
733 fprintf(output, " -L adjust the frame length when chopping and/or snapping\n");
734 fprintf(output, " -t <time adjustment> adjust the timestamp of each packet;\n");
735 fprintf(output, " <time adjustment> is in relative seconds (e.g. -0.5).\n");
736 fprintf(output, " -S <strict adjustment> adjust timestamp of packets if necessary to insure\n");
737 fprintf(output, " strict chronological increasing order. The <strict\n");
738 fprintf(output, " adjustment> is specified in relative seconds with\n");
739 fprintf(output, " values of 0 or 0.000001 being the most reasonable.\n");
740 fprintf(output, " A negative adjustment value will modify timestamps so\n");
741 fprintf(output, " that each packet's delta time is the absolute value\n");
742 fprintf(output, " of the adjustment specified. A value of -0 will set\n");
743 fprintf(output, " all packets to the timestamp of the first packet.\n");
744 fprintf(output, " -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
745 fprintf(output, " a particular packet byte will be randomly changed.\n");
746 fprintf(output, "\n");
747 fprintf(output, "Output File(s):\n");
748 fprintf(output, " -c <packets per file> split the packet output to different files based on\n");
749 fprintf(output, " uniform packet counts with a maximum of\n");
750 fprintf(output, " <packets per file> each.\n");
751 fprintf(output, " -i <seconds per file> split the packet output to different files based on\n");
752 fprintf(output, " uniform time intervals with a maximum of\n");
753 fprintf(output, " <seconds per file> each.\n");
754 fprintf(output, " -F <capture type> set the output file type; default is pcapng. An empty\n");
755 fprintf(output, " \"-F\" option will list the file types.\n");
756 fprintf(output, " -T <encap type> set the output file encapsulation type; default is the\n");
757 fprintf(output, " same as the input file. An empty \"-T\" option will\n");
758 fprintf(output, " list the encapsulation types.\n");
759 fprintf(output, "\n");
760 fprintf(output, "Miscellaneous:\n");
761 fprintf(output, " -h display this help and exit.\n");
762 fprintf(output, " -v verbose output.\n");
763 fprintf(output, " If -v is used with any of the 'Duplicate Packet\n");
764 fprintf(output, " Removal' options (-d, -D or -w) then Packet lengths\n");
765 fprintf(output, " and MD5 hashes are printed to standard-out.\n");
766 fprintf(output, "\n");
770 const char *sstr; /* The short string */
771 const char *lstr; /* The long string */
775 string_compare(gconstpointer a, gconstpointer b)
777 return strcmp(((const struct string_elem *)a)->sstr,
778 ((const struct string_elem *)b)->sstr);
782 string_nat_compare(gconstpointer a, gconstpointer b)
784 return strnatcmp(((const struct string_elem *)a)->sstr,
785 ((const struct string_elem *)b)->sstr);
789 string_elem_print(gpointer data, gpointer not_used _U_)
791 fprintf(stderr, " %s - %s\n",
792 ((struct string_elem *)data)->sstr,
793 ((struct string_elem *)data)->lstr);
797 list_capture_types(void) {
799 struct string_elem *captypes;
802 captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES_SUBTYPES);
803 fprintf(stderr, "editcap: The available capture file types for the \"-F\" flag are:\n");
804 for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
805 if (wtap_dump_can_open(i)) {
806 captypes[i].sstr = wtap_file_type_subtype_short_string(i);
807 captypes[i].lstr = wtap_file_type_subtype_string(i);
808 list = g_slist_insert_sorted(list, &captypes[i], string_compare);
811 g_slist_foreach(list, string_elem_print, NULL);
817 list_encap_types(void) {
819 struct string_elem *encaps;
822 encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
823 fprintf(stderr, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
824 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
825 encaps[i].sstr = wtap_encap_short_string(i);
826 if (encaps[i].sstr != NULL) {
827 encaps[i].lstr = wtap_encap_string(i);
828 list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
831 g_slist_foreach(list, string_elem_print, NULL);
838 * Don't report failures to load plugins because most (non-wiretap) plugins
839 * *should* fail to load (because we're not linked against libwireshark and
840 * dissector plugins need libwireshark).
843 failure_message(const char *msg_format _U_, va_list ap _U_)
849 main(int argc, char *argv[])
857 guint32 snaplen = 0; /* No limit */
858 chop_t chop = {0, 0, 0, 0, 0, 0}; /* No chop */
859 gboolean adjlen = FALSE;
860 wtap_dumper *pdh = NULL;
861 unsigned int count = 1;
862 unsigned int duplicate_count = 0;
864 struct wtap_pkthdr snap_phdr;
865 const struct wtap_pkthdr *phdr;
867 wtapng_section_t *shb_hdr;
868 wtapng_iface_descriptions_t *idb_inf;
870 guint32 read_count = 0;
871 int split_packet_count = 0;
872 int written_count = 0;
873 char *filename = NULL;
874 gboolean ts_okay = TRUE;
875 int secs_per_block = 0;
877 nstime_t block_start;
878 gchar *fprefix = NULL;
879 gchar *fsuffix = NULL;
883 char* init_progfile_dir_error;
887 arg_list_utf_16to8(argc, argv);
888 create_app_running_mutex();
892 * Get credential information for later use.
894 init_process_policies();
897 /* Register wiretap plugins */
898 if ((init_progfile_dir_error = init_progfile_dir(argv[0], main))) {
899 g_warning("editcap: init_progfile_dir(): %s", init_progfile_dir_error);
900 g_free(init_progfile_dir_error);
902 /* Register all the plugin types we have. */
903 wtap_register_plugin_types(); /* Types known to libwiretap */
905 init_report_err(failure_message,NULL,NULL,NULL);
907 /* Scan for plugins. This does *not* call their registration routines;
908 that's done later. */
911 /* Register all libwiretap plugin modules. */
912 register_all_wiretap_modules();
916 /* Process the options */
917 while ((opt = getopt(argc, argv, "A:B:c:C:dD:E:F:hi:Lrs:S:t:T:vw:")) != -1) {
923 memset(&starttm,0,sizeof(struct tm));
925 if (!strptime(optarg,"%Y-%m-%d %T", &starttm)) {
926 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
931 check_startstop = TRUE;
932 starttm.tm_isdst = -1;
934 starttime = mktime(&starttm);
942 memset(&stoptm,0,sizeof(struct tm));
944 if (!strptime(optarg,"%Y-%m-%d %T", &stoptm)) {
945 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
949 check_startstop = TRUE;
950 stoptm.tm_isdst = -1;
951 stoptime = mktime(&stoptm);
956 split_packet_count = (int)strtol(optarg, &p, 10);
957 if (p == optarg || *p != '\0') {
958 fprintf(stderr, "editcap: \"%s\" isn't a valid packet count\n",
962 if (split_packet_count <= 0) {
963 fprintf(stderr, "editcap: \"%d\" packet count must be larger than zero\n",
971 int choplen = 0, chopoff = 0;
973 switch (sscanf(optarg, "%d:%d", &chopoff, &choplen)) {
974 case 1: /* only the chop length was specififed */
979 case 2: /* both an offset and chop length was specified */
983 fprintf(stderr, "editcap: \"%s\" isn't a valid chop length or offset:length\n",
990 chop.len_begin += choplen;
992 chop.off_begin_pos += chopoff;
994 chop.off_begin_neg += chopoff;
995 } else if (choplen < 0) {
996 chop.len_end += choplen;
998 chop.off_end_pos += chopoff;
1000 chop.off_end_neg += chopoff;
1007 dup_detect_by_time = FALSE;
1008 dup_window = DEFAULT_DUP_DEPTH;
1013 dup_detect_by_time = FALSE;
1014 dup_window = (int)strtol(optarg, &p, 10);
1015 if (p == optarg || *p != '\0') {
1016 fprintf(stderr, "editcap: \"%s\" isn't a valid duplicate window value\n",
1020 if (dup_window < 0 || dup_window > MAX_DUP_DEPTH) {
1021 fprintf(stderr, "editcap: \"%d\" duplicate window value must be between 0 and %d inclusive.\n",
1022 dup_window, MAX_DUP_DEPTH);
1028 err_prob = strtod(optarg, &p);
1029 if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
1030 fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
1034 srand( (unsigned int) (time(NULL) + getpid()) );
1038 out_file_type_subtype = wtap_short_string_to_file_type_subtype(optarg);
1039 if (out_file_type_subtype < 0) {
1040 fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
1042 list_capture_types();
1052 case 'i': /* break capture file based on time interval */
1053 secs_per_block = atoi(optarg);
1054 if (secs_per_block <= 0) {
1055 fprintf(stderr, "editcap: \"%s\" isn't a valid time interval\n\n",
1066 keep_em = !keep_em; /* Just invert */
1070 snaplen = (guint32)strtol(optarg, &p, 10);
1071 if (p == optarg || *p != '\0') {
1072 fprintf(stderr, "editcap: \"%s\" isn't a valid snapshot length\n",
1079 set_strict_time_adj(optarg);
1080 do_strict_time_adjustment = TRUE;
1084 set_time_adjustment(optarg);
1088 out_frame_type = wtap_short_string_to_encap(optarg);
1089 if (out_frame_type < 0) {
1090 fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
1098 verbose = !verbose; /* Just invert */
1103 dup_detect_by_time = TRUE;
1104 dup_window = MAX_DUP_DEPTH;
1105 set_rel_time(optarg);
1108 case '?': /* Bad options if GNU getopt */
1111 list_capture_types();
1126 fprintf(stderr, "Optind = %i, argc = %i\n", optind, argc);
1129 if ((argc - optind) < 1) {
1134 if (check_startstop && !stoptime) {
1137 /* XXX: will work until 2035 */
1138 memset(&stoptm,0,sizeof(struct tm));
1139 stoptm.tm_year = 135;
1140 stoptm.tm_mday = 31;
1143 stoptime = mktime(&stoptm);
1146 nstime_set_unset(&block_start);
1148 if (starttime > stoptime) {
1149 fprintf(stderr, "editcap: start time is after the stop time\n");
1153 if (split_packet_count > 0 && secs_per_block > 0) {
1154 fprintf(stderr, "editcap: can't split on both packet count and time interval\n");
1155 fprintf(stderr, "editcap: at the same time\n");
1159 wth = wtap_open_offline(argv[optind], &err, &err_info, FALSE);
1162 fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
1163 wtap_strerror(err));
1165 case WTAP_ERR_UNSUPPORTED:
1166 case WTAP_ERR_UNSUPPORTED_ENCAP:
1167 case WTAP_ERR_BAD_FILE:
1168 fprintf(stderr, "(%s)\n", err_info);
1176 fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
1177 wtap_file_type_subtype_string(wtap_file_type_subtype(wth)));
1180 shb_hdr = wtap_file_get_shb_info(wth);
1181 idb_inf = wtap_file_get_idb_info(wth);
1184 * Now, process the rest, if any ... we only write if there is an extra
1185 * argument or so ...
1188 if ((argc - optind) >= 2) {
1189 if (out_frame_type == -2)
1190 out_frame_type = wtap_file_encap(wth);
1192 for (i = optind + 2; i < argc; i++)
1193 if (add_selection(argv[i]) == FALSE)
1196 if (dup_detect || dup_detect_by_time) {
1197 for (i = 0; i < dup_window; i++) {
1198 memset(&fd_hash[i].digest, 0, 16);
1200 nstime_set_unset(&fd_hash[i].time);
1204 while (wtap_read(wth, &err, &err_info, &data_offset)) {
1207 phdr = wtap_phdr(wth);
1208 buf = wtap_buf_ptr(wth);
1210 if (nstime_is_unset(&block_start)) { /* should only be the first packet */
1211 block_start.secs = phdr->ts.secs;
1212 block_start.nsecs = phdr->ts.nsecs;
1214 if (split_packet_count > 0 || secs_per_block > 0) {
1215 if (!fileset_extract_prefix_suffix(argv[optind+1], &fprefix, &fsuffix))
1218 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1220 filename = g_strdup(argv[optind+1]);
1223 /* If we don't have an application name add Editcap */
1224 if (shb_hdr->shb_user_appl == NULL) {
1225 g_snprintf(appname, sizeof(appname), "Editcap " VERSION);
1226 shb_hdr->shb_user_appl = appname;
1229 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1230 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1231 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1234 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1235 filename, wtap_strerror(err));
1242 if (secs_per_block > 0) {
1243 while ((phdr->ts.secs - block_start.secs > secs_per_block)
1244 || (phdr->ts.secs - block_start.secs == secs_per_block
1245 && phdr->ts.nsecs >= block_start.nsecs )) { /* time for the next file */
1247 if (!wtap_dump_close(pdh, &err)) {
1248 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1249 filename, wtap_strerror(err));
1252 block_start.secs = block_start.secs + secs_per_block; /* reset for next interval */
1254 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1258 fprintf(stderr, "Continuing writing in file %s\n", filename);
1260 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1261 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1262 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1265 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1266 filename, wtap_strerror(err));
1272 if (split_packet_count > 0) {
1273 /* time for the next file? */
1274 if (written_count > 0 && written_count % split_packet_count == 0) {
1275 if (!wtap_dump_close(pdh, &err)) {
1276 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1277 filename, wtap_strerror(err));
1282 filename = fileset_get_filename_by_pattern(block_cnt++, &phdr->ts, fprefix, fsuffix);
1286 fprintf(stderr, "Continuing writing in file %s\n", filename);
1288 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1289 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1290 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1292 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1293 filename, wtap_strerror(err));
1299 if (check_startstop)
1300 ts_okay = check_timestamp(wth);
1302 if (ts_okay && ((!selected(count) && !keep_em)
1303 || (selected(count) && keep_em))) {
1305 if (verbose && !dup_detect && !dup_detect_by_time)
1306 fprintf(stderr, "Packet: %u\n", count);
1308 /* We simply write it, perhaps after truncating it; we could
1309 * do other things, like modify it. */
1311 phdr = wtap_phdr(wth);
1314 if (phdr->caplen > snaplen) {
1316 snap_phdr.caplen = snaplen;
1319 if (adjlen && phdr->len > snaplen) {
1321 snap_phdr.len = snaplen;
1328 handle_chopping(chop, &snap_phdr, phdr, &buf, adjlen);
1331 /* Do we adjust timestamps to ensure strict chronological
1333 if (do_strict_time_adjustment) {
1334 if (previous_time.secs || previous_time.nsecs) {
1335 if (!strict_time_adj.is_negative) {
1339 current.secs = phdr->ts.secs;
1340 current.nsecs = phdr->ts.nsecs;
1342 nstime_delta(&delta, ¤t, &previous_time);
1344 if (delta.secs < 0 || delta.nsecs < 0) {
1346 * A negative delta indicates that the current packet
1347 * has an absolute timestamp less than the previous packet
1348 * that it is being compared to. This is NOT a normal
1349 * situation since trace files usually have packets in
1350 * chronological order (oldest to newest).
1352 /* printf("++out of order, need to adjust this packet!\n"); */
1354 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1355 snap_phdr.ts.nsecs = previous_time.nsecs;
1356 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1358 snap_phdr.ts.secs++;
1359 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1361 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1367 * A negative strict time adjustment is requested.
1368 * Unconditionally set each timestamp to previous
1369 * packet's timestamp plus delta.
1372 snap_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.tv_sec;
1373 snap_phdr.ts.nsecs = previous_time.nsecs;
1374 if (snap_phdr.ts.nsecs + strict_time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1376 snap_phdr.ts.secs++;
1377 snap_phdr.ts.nsecs += (strict_time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1379 snap_phdr.ts.nsecs += strict_time_adj.tv.tv_usec * 1000;
1384 previous_time.secs = phdr->ts.secs;
1385 previous_time.nsecs = phdr->ts.nsecs;
1388 /* assume that if the frame's tv_sec is 0, then
1389 * the timestamp isn't supported */
1390 if (phdr->ts.secs > 0 && time_adj.tv.tv_sec != 0) {
1392 if (time_adj.is_negative)
1393 snap_phdr.ts.secs -= time_adj.tv.tv_sec;
1395 snap_phdr.ts.secs += time_adj.tv.tv_sec;
1399 /* assume that if the frame's tv_sec is 0, then
1400 * the timestamp isn't supported */
1401 if (phdr->ts.secs > 0 && time_adj.tv.tv_usec != 0) {
1403 if (time_adj.is_negative) { /* subtract */
1404 if (snap_phdr.ts.nsecs/1000 < time_adj.tv.tv_usec) { /* borrow */
1405 snap_phdr.ts.secs--;
1406 snap_phdr.ts.nsecs += ONE_MILLION * 1000;
1408 snap_phdr.ts.nsecs -= time_adj.tv.tv_usec * 1000;
1410 if (snap_phdr.ts.nsecs + time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
1412 snap_phdr.ts.secs++;
1413 snap_phdr.ts.nsecs += (time_adj.tv.tv_usec - ONE_MILLION) * 1000;
1415 snap_phdr.ts.nsecs += time_adj.tv.tv_usec * 1000;
1421 /* suppress duplicates by packet window */
1423 if (is_duplicate(buf, phdr->caplen)) {
1425 fprintf(stdout, "Skipped: %u, Len: %u, MD5 Hash: ",
1426 count, phdr->caplen);
1427 for (i = 0; i < 16; i++)
1428 fprintf(stdout, "%02x",
1429 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1430 fprintf(stdout, "\n");
1437 fprintf(stdout, "Packet: %u, Len: %u, MD5 Hash: ",
1438 count, phdr->caplen);
1439 for (i = 0; i < 16; i++)
1440 fprintf(stdout, "%02x",
1441 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1442 fprintf(stdout, "\n");
1447 /* suppress duplicates by time window */
1448 if (dup_detect_by_time) {
1451 current.secs = phdr->ts.secs;
1452 current.nsecs = phdr->ts.nsecs;
1454 if (is_duplicate_rel_time(buf, phdr->caplen, ¤t)) {
1456 fprintf(stdout, "Skipped: %u, Len: %u, MD5 Hash: ",
1457 count, phdr->caplen);
1458 for (i = 0; i < 16; i++)
1459 fprintf(stdout, "%02x",
1460 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1461 fprintf(stdout, "\n");
1468 fprintf(stdout, "Packet: %u, Len: %u, MD5 Hash: ",
1469 count, phdr->caplen);
1470 for (i = 0; i < 16; i++)
1471 fprintf(stdout, "%02x",
1472 (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1473 fprintf(stdout, "\n");
1478 /* Random error mutation */
1479 if (err_prob > 0.0) {
1480 int real_data_start = 0;
1482 /* Protect non-protocol data */
1483 if (wtap_file_type_subtype(wth) == WTAP_FILE_TYPE_SUBTYPE_CATAPULT_DCT2000)
1484 real_data_start = find_dct2000_real_data(buf);
1486 for (i = real_data_start; i < (int) phdr->caplen; i++) {
1487 if (rand() <= err_prob * RAND_MAX) {
1488 err_type = rand() / (RAND_MAX / ERR_WT_TOTAL + 1);
1490 if (err_type < ERR_WT_BIT) {
1491 buf[i] ^= 1 << (rand() / (RAND_MAX / 8 + 1));
1492 err_type = ERR_WT_TOTAL;
1494 err_type -= ERR_WT_BYTE;
1497 if (err_type < ERR_WT_BYTE) {
1498 buf[i] = rand() / (RAND_MAX / 255 + 1);
1499 err_type = ERR_WT_TOTAL;
1501 err_type -= ERR_WT_BYTE;
1504 if (err_type < ERR_WT_ALNUM) {
1505 buf[i] = ALNUM_CHARS[rand() / (RAND_MAX / ALNUM_LEN + 1)];
1506 err_type = ERR_WT_TOTAL;
1508 err_type -= ERR_WT_ALNUM;
1511 if (err_type < ERR_WT_FMT) {
1512 if ((unsigned int)i < phdr->caplen - 2)
1513 g_strlcpy((char*) &buf[i], "%s", 2);
1514 err_type = ERR_WT_TOTAL;
1516 err_type -= ERR_WT_FMT;
1519 if (err_type < ERR_WT_AA) {
1520 for (j = i; j < (int) phdr->caplen; j++)
1528 if (!wtap_dump(pdh, phdr, buf, &err)) {
1530 case WTAP_ERR_UNSUPPORTED_ENCAP:
1532 * This is a problem with the particular frame we're
1533 * writing; note that, and give the frame number.
1536 "editcap: Frame %u of \"%s\" has a network type that can't be saved in a file with that format\n.",
1537 read_count, argv[optind]);
1541 fprintf(stderr, "editcap: Error writing to %s: %s\n",
1542 filename, wtap_strerror(err));
1556 /* Print a message noting that the read failed somewhere along the
1559 "editcap: An error occurred while reading \"%s\": %s.\n",
1560 argv[optind], wtap_strerror(err));
1562 case WTAP_ERR_UNSUPPORTED:
1563 case WTAP_ERR_UNSUPPORTED_ENCAP:
1564 case WTAP_ERR_BAD_FILE:
1565 fprintf(stderr, "(%s)\n", err_info);
1572 /* No valid packages found, open the outfile so we can write an
1575 filename = g_strdup(argv[optind+1]);
1577 pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
1578 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)): wtap_snapshot_length(wth),
1579 FALSE /* compressed */, shb_hdr, idb_inf, &err);
1581 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1582 filename, wtap_strerror(err));
1590 if (!wtap_dump_close(pdh, &err)) {
1591 fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
1592 wtap_strerror(err));
1600 fprintf(stdout, "%u packet%s seen, %u packet%s skipped with duplicate window of %u packets.\n",
1601 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1602 plurality(duplicate_count, "", "s"), dup_window);
1603 } else if (dup_detect_by_time) {
1604 fprintf(stdout, "%u packet%s seen, %u packet%s skipped with duplicate time window equal to or less than %ld.%09ld seconds.\n",
1605 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1606 plurality(duplicate_count, "", "s"),
1607 (long)relative_time_window.secs,
1608 (long int)relative_time_window.nsecs);
1614 /* Skip meta-information read from file to return offset of real
1617 find_dct2000_real_data(guint8 *buf)
1621 for (n = 0; buf[n] != '\0'; n++); /* Context name */
1623 n++; /* Context port number */
1624 for (; buf[n] != '\0'; n++); /* Timestamp */
1626 for (; buf[n] != '\0'; n++); /* Protocol name */
1628 for (; buf[n] != '\0'; n++); /* Variant number (as string) */
1630 for (; buf[n] != '\0'; n++); /* Outhdr (as string) */
1632 n += 2; /* Direction & encap */
1638 * We support up to 2 chopping regions in a single pas, one specified by the
1639 * positive chop length, and one by the negative chop length.
1642 handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
1643 const struct wtap_pkthdr *in_phdr, guint8 **buf,
1646 /* If we're not chopping anything from one side, then the offset for that
1647 * side is meaningless. */
1648 if (chop.len_begin == 0)
1649 chop.off_begin_pos = chop.off_begin_neg = 0;
1650 if (chop.len_end == 0)
1651 chop.off_end_pos = chop.off_end_neg = 0;
1653 if (chop.off_begin_neg < 0) {
1654 chop.off_begin_pos += in_phdr->caplen + chop.off_begin_neg;
1655 chop.off_begin_neg = 0;
1657 if (chop.off_end_pos > 0) {
1658 chop.off_end_neg += chop.off_end_pos - in_phdr->caplen;
1659 chop.off_end_pos = 0;
1662 /* If we've crossed chopping regions, swap them */
1663 if (chop.len_begin && chop.len_end) {
1664 if (chop.off_begin_pos > ((int)in_phdr->caplen + chop.off_end_neg)) {
1665 int tmp_len, tmp_off;
1667 tmp_off = in_phdr->caplen + chop.off_end_neg + chop.len_end;
1668 tmp_len = -chop.len_end;
1670 chop.off_end_neg = chop.len_begin + chop.off_begin_pos - in_phdr->caplen;
1671 chop.len_end = -chop.len_begin;
1673 chop.len_begin = tmp_len;
1674 chop.off_begin_pos = tmp_off;
1678 /* Make sure we don't chop off more than we have available */
1679 if (in_phdr->caplen < (guint32)(chop.off_begin_pos - chop.off_end_neg)) {
1683 if ((guint32)(chop.len_begin - chop.len_end) >
1684 (in_phdr->caplen - (guint32)(chop.off_begin_pos - chop.off_end_neg))) {
1685 chop.len_begin = in_phdr->caplen - (chop.off_begin_pos - chop.off_end_neg);
1689 /* Handle chopping from the beginning. Note that if a beginning offset
1690 * was specified, we need to keep that piece */
1691 if (chop.len_begin > 0) {
1692 *out_phdr = *in_phdr;
1694 if (chop.off_begin_pos > 0) {
1695 memmove(*buf + chop.off_begin_pos,
1696 *buf + chop.off_begin_pos + chop.len_begin,
1697 out_phdr->caplen - chop.len_begin);
1699 *buf += chop.len_begin;
1701 out_phdr->caplen -= chop.len_begin;
1704 if (in_phdr->len > (guint32)chop.len_begin)
1705 out_phdr->len -= chop.len_begin;
1712 /* Handle chopping from the end. Note that if an ending offset was
1713 * specified, we need to keep that piece */
1714 if (chop.len_end < 0) {
1715 *out_phdr = *in_phdr;
1717 if (chop.off_end_neg < 0) {
1718 memmove(*buf + (gint)out_phdr->caplen + (chop.len_end + chop.off_end_neg),
1719 *buf + (gint)out_phdr->caplen + chop.off_end_neg,
1722 out_phdr->caplen += chop.len_end;
1725 if (((signed int) in_phdr->len + chop.len_end) > 0)
1726 out_phdr->len += chop.len_end;
1730 /*in_phdr = out_phdr;*/
1735 * Editor modelines - http://www.wireshark.org/tools/modelines.html
1740 * indent-tabs-mode: nil
1743 * vi: set shiftwidth=4 tabstop=4 expandtab:
1744 * :indentSize=4:tabSize=4:noTabs=true: