1 /* Combine two dump files, either by appending or by merging by timestamp
5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 * Mergecap written by Scott Renfro <scott@renfro.org> based on
24 * editcap by Richard Sharpe and Guy Harris
39 #ifdef HAVE_SYS_TIME_H
47 #include "wsutil/wsgetopt.h"
51 #define RESET_SYMBOL_EXPORT /* wsutil/wsgetopt.h set export behavior above. */
52 #include "epan/strnatcmp.h"
54 #define RESET_SYMBOL_EXPORT
56 #include "svnversion.h"
58 #include "wsutil/file_util.h"
65 #include <wsutil/unicode-utils.h>
69 get_natural_int(const char *string, const char *name)
74 number = strtol(string, &p, 10);
75 if (p == string || *p != '\0') {
76 fprintf(stderr, "mergecap: The specified %s \"%s\" isn't a decimal number\n",
81 fprintf(stderr, "mergecap: The specified %s is a negative number\n",
85 if (number > INT_MAX) {
86 fprintf(stderr, "mergecap: The specified %s is too large (greater than %d)\n",
94 get_positive_int(const char *string, const char *name)
98 number = get_natural_int(string, name);
101 fprintf(stderr, "mergecap: The specified %s is zero\n",
116 fprintf(stderr, "Mergecap %s"
118 " (" SVNVERSION " from " SVNPATH ")"
121 fprintf(stderr, "Merge two or more capture files into one.\n");
122 fprintf(stderr, "See http://www.wireshark.org for more information.\n");
123 fprintf(stderr, "\n");
124 fprintf(stderr, "Usage: mergecap [options] -w <outfile>|- <infile> [<infile> ...]\n");
125 fprintf(stderr, "\n");
126 fprintf(stderr, "Output:\n");
127 fprintf(stderr, " -a concatenate rather than merge files.\n");
128 fprintf(stderr, " default is to merge based on frame timestamps.\n");
129 fprintf(stderr, " -s <snaplen> truncate packets to <snaplen> bytes of data.\n");
130 fprintf(stderr, " -w <outfile>|- set the output filename to <outfile> or '-' for stdout.\n");
131 fprintf(stderr, " -F <capture type> set the output file type; default is pcapng.\n");
132 fprintf(stderr, " an empty \"-F\" option will list the file types.\n");
133 fprintf(stderr, " -T <encap type> set the output file encapsulation type;\n");
134 fprintf(stderr, " default is the same as the first input file.\n");
135 fprintf(stderr, " an empty \"-T\" option will list the encapsulation types.\n");
136 fprintf(stderr, "\n");
137 fprintf(stderr, "Miscellaneous:\n");
138 fprintf(stderr, " -h display this help and exit.\n");
139 fprintf(stderr, " -v verbose output.\n");
143 const char *sstr; /* The short string */
144 const char *lstr; /* The long string */
148 string_compare(gconstpointer a, gconstpointer b)
150 return strcmp(((const struct string_elem *)a)->sstr,
151 ((const struct string_elem *)b)->sstr);
155 string_nat_compare(gconstpointer a, gconstpointer b)
157 return strnatcmp(((const struct string_elem *)a)->sstr,
158 ((const struct string_elem *)b)->sstr);
162 string_elem_print(gpointer data, gpointer not_used _U_)
164 fprintf(stderr, " %s - %s\n",
165 ((struct string_elem *)data)->sstr,
166 ((struct string_elem *)data)->lstr);
170 list_capture_types(void) {
172 struct string_elem *captypes;
175 captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES);
177 fprintf(stderr, "mergecap: The available capture file types for the \"-F\" flag are:\n");
178 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
179 if (wtap_dump_can_open(i)) {
180 captypes[i].sstr = wtap_file_type_short_string(i);
181 captypes[i].lstr = wtap_file_type_string(i);
182 list = g_slist_insert_sorted(list, &captypes[i], string_compare);
185 g_slist_foreach(list, string_elem_print, NULL);
191 list_encap_types(void) {
193 struct string_elem *encaps;
196 encaps = g_new(struct string_elem,WTAP_NUM_ENCAP_TYPES);
197 fprintf(stderr, "mergecap: The available encapsulation types for the \"-T\" flag are:\n");
198 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
199 encaps[i].sstr = wtap_encap_short_string(i);
200 if (encaps[i].sstr != NULL) {
201 encaps[i].lstr = wtap_encap_string(i);
202 list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
205 g_slist_foreach(list, string_elem_print, NULL);
211 main(int argc, char *argv[])
215 gboolean do_append = FALSE;
216 gboolean verbose = FALSE;
217 int in_file_count = 0;
219 #ifdef PCAP_NG_DEFAULT
220 int file_type = WTAP_FILE_PCAPNG; /* default to pcap format */
222 int file_type = WTAP_FILE_PCAP; /* default to pcapng format */
226 merge_in_file_t *in_files = NULL, *in_file;
228 struct wtap_pkthdr *phdr, snap_phdr;
230 int open_err, read_err=0, write_err, close_err;
233 char *out_filename = NULL;
234 gboolean got_read_error = FALSE, got_write_error = FALSE;
238 arg_list_utf_16to8(argc, argv);
239 create_app_running_mutex();
242 /* Process the options first */
243 while ((opt = getopt(argc, argv, "hvas:T:F:w:")) != -1) {
247 out_filename = optarg;
251 do_append = !do_append;
255 frame_type = wtap_short_string_to_encap(optarg);
256 if (frame_type < 0) {
257 fprintf(stderr, "mergecap: \"%s\" isn't a valid encapsulation type\n",
265 file_type = wtap_short_string_to_file_type(optarg);
267 fprintf(stderr, "mergecap: \"%s\" isn't a valid capture file type\n",
269 list_capture_types();
279 snaplen = get_positive_int(optarg, "snapshot length");
287 case '?': /* Bad options if GNU getopt */
290 list_capture_types();
305 /* check for proper args; at a minimum, must have an output
306 * filename and one input file
308 in_file_count = argc - optind;
310 fprintf(stderr, "mergecap: an output filename must be set with -w\n");
311 fprintf(stderr, " run with -h for help\n");
314 if (in_file_count < 1) {
315 fprintf(stderr, "mergecap: No input files were specified\n");
319 /* open the input files */
320 if (!merge_open_in_files(in_file_count, &argv[optind], &in_files,
321 &open_err, &err_info, &err_fileno)) {
322 fprintf(stderr, "mergecap: Can't open %s: %s\n", argv[optind + err_fileno],
323 wtap_strerror(open_err));
326 case WTAP_ERR_UNSUPPORTED:
327 case WTAP_ERR_UNSUPPORTED_ENCAP:
328 case WTAP_ERR_BAD_FILE:
329 fprintf(stderr, "(%s)\n", err_info);
337 for (i = 0; i < in_file_count; i++)
338 fprintf(stderr, "mergecap: %s is type %s.\n", argv[optind + i],
339 wtap_file_type_string(wtap_file_type(in_files[i].wth)));
344 * Snapshot length not specified - default to the maximum of the
345 * snapshot lengths of the input files.
347 snaplen = merge_max_snapshot_length(in_file_count, in_files);
350 /* set the outfile frame type */
351 if (frame_type == -2) {
353 * Default to the appropriate frame type for the input files.
355 frame_type = merge_select_frame_type(in_file_count, in_files);
357 if (frame_type == WTAP_ENCAP_PER_PACKET) {
359 * Find out why we had to choose WTAP_ENCAP_PER_PACKET.
361 int first_frame_type, this_frame_type;
363 first_frame_type = wtap_file_encap(in_files[0].wth);
364 for (i = 1; i < in_file_count; i++) {
365 this_frame_type = wtap_file_encap(in_files[i].wth);
366 if (first_frame_type != this_frame_type) {
367 fprintf(stderr, "mergecap: multiple frame encapsulation types detected\n");
368 fprintf(stderr, " defaulting to WTAP_ENCAP_PER_PACKET\n");
369 fprintf(stderr, " %s had type %s (%s)\n",
370 in_files[0].filename,
371 wtap_encap_string(first_frame_type),
372 wtap_encap_short_string(first_frame_type));
373 fprintf(stderr, " %s had type %s (%s)\n",
374 in_files[i].filename,
375 wtap_encap_string(this_frame_type),
376 wtap_encap_short_string(this_frame_type));
381 fprintf(stderr, "mergecap: selected frame_type %s (%s)\n",
382 wtap_encap_string(frame_type),
383 wtap_encap_short_string(frame_type));
387 /* open the outfile */
388 if (strncmp(out_filename, "-", 2) == 0) {
389 /* use stdout as the outfile */
390 out_fd = 1 /*stdout*/;
392 /* open the outfile */
393 out_fd = ws_open(out_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
395 fprintf(stderr, "mergecap: Couldn't open output file %s: %s\n",
396 out_filename, g_strerror(errno));
401 /* prepare the outfile */
402 if(file_type == WTAP_FILE_PCAPNG ){
403 wtapng_section_t *shb_hdr;
404 GString *comment_gstr;
406 shb_hdr = g_new(wtapng_section_t,1);
407 comment_gstr = g_string_new("File created by merging: \n");
409 for (i = 0; i < in_file_count; i++) {
410 g_string_append_printf(comment_gstr, "File%d: %s \n",i+1,in_files[i].filename);
412 shb_hdr->section_length = -1;
414 shb_hdr->opt_comment = comment_gstr->str; /* NULL if not available */
415 shb_hdr->shb_hardware = NULL; /* NULL if not available, UTF-8 string containing the description of the hardware used to create this section. */
416 shb_hdr->shb_os = NULL; /* NULL if not available, UTF-8 string containing the name of the operating system used to create this section. */
417 shb_hdr->shb_user_appl = "mergecap"; /* NULL if not available, UTF-8 string containing the name of the application used to create this section. */
419 pdh = wtap_dump_fdopen_ng(out_fd, file_type, frame_type, snaplen,
420 FALSE /* compressed */, shb_hdr, NULL /* wtapng_iface_descriptions_t *idb_inf */, &open_err);
421 g_string_free(comment_gstr, TRUE);
423 pdh = wtap_dump_fdopen(out_fd, file_type, frame_type, snaplen, FALSE /* compressed */, &open_err);
426 merge_close_in_files(in_file_count, in_files);
428 fprintf(stderr, "mergecap: Can't open or create %s: %s\n", out_filename,
429 wtap_strerror(open_err));
433 /* do the merge (or append) */
437 in_file = merge_append_read_packet(in_file_count, in_files, &read_err,
440 in_file = merge_read_packet(in_file_count, in_files, &read_err,
442 if (in_file == NULL) {
448 /* I/O error reading from in_file */
449 got_read_error = TRUE;
454 fprintf(stderr, "Record: %u\n", count++);
456 /* We simply write it, perhaps after truncating it; we could do other
457 * things, like modify it. */
458 phdr = wtap_phdr(in_file->wth);
459 if (snaplen != 0 && phdr->caplen > snaplen) {
461 snap_phdr.caplen = snaplen;
465 if (!wtap_dump(pdh, phdr, wtap_buf_ptr(in_file->wth), &write_err)) {
466 got_write_error = TRUE;
471 merge_close_in_files(in_file_count, in_files);
472 if (!got_read_error && !got_write_error) {
473 if (!wtap_dump_close(pdh, &write_err))
474 got_write_error = TRUE;
476 wtap_dump_close(pdh, &close_err);
478 if (got_read_error) {
480 * Find the file on which we got the error, and report the error.
482 for (i = 0; i < in_file_count; i++) {
483 if (in_files[i].state == GOT_ERROR) {
484 fprintf(stderr, "mergecap: Error reading %s: %s\n",
485 in_files[i].filename, wtap_strerror(read_err));
488 case WTAP_ERR_UNSUPPORTED:
489 case WTAP_ERR_UNSUPPORTED_ENCAP:
490 case WTAP_ERR_BAD_FILE:
491 fprintf(stderr, "(%s)\n", err_info);
499 if (got_write_error) {
502 case WTAP_ERR_UNSUPPORTED_ENCAP:
504 * This is a problem with the particular frame we're writing;
505 * note that, and give the frame number.
507 fprintf(stderr, "mergecap: Frame %u of \"%s\" has a network type that can't be saved in a file with that format\n.",
508 in_file->packet_num, in_file->filename);
512 fprintf(stderr, "mergecap: Error writing to outfile: %s\n",
513 wtap_strerror(write_err));
520 return (!got_read_error && !got_write_error) ? 0 : 2;