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
41 #ifdef HAVE_SYS_TIME_H
49 #include "wsutil/wsgetopt.h"
52 #include "svnversion.h"
54 #include "wsutil/file_util.h"
61 #include <wsutil/unicode-utils.h>
65 get_natural_int(const char *string, const char *name)
70 number = (int) strtol(string, &p, 10);
71 if (p == string || *p != '\0') {
72 fprintf(stderr, "mergecap: The specified %s \"%s\" isn't a decimal number\n",
77 fprintf(stderr, "mergecap: The specified %s is a negative number\n",
81 if (number > INT_MAX) {
82 fprintf(stderr, "mergecap: The specified %s is too large (greater than %d)\n",
90 get_positive_int(const char *string, const char *name)
94 number = get_natural_int(string, name);
97 fprintf(stderr, "mergecap: The specified %s is zero\n",
112 fprintf(stderr, "Mergecap %s"
114 " (" SVNVERSION " from " SVNPATH ")"
117 fprintf(stderr, "Merge two or more capture files into one.\n");
118 fprintf(stderr, "See http://www.wireshark.org for more information.\n");
119 fprintf(stderr, "\n");
120 fprintf(stderr, "Usage: mergecap [options] -w <outfile>|- <infile> [<infile> ...]\n");
121 fprintf(stderr, "\n");
122 fprintf(stderr, "Output:\n");
123 fprintf(stderr, " -a concatenate rather than merge files.\n");
124 fprintf(stderr, " default is to merge based on frame timestamps.\n");
125 fprintf(stderr, " -s <snaplen> truncate packets to <snaplen> bytes of data.\n");
126 fprintf(stderr, " -w <outfile>|- set the output filename to <outfile> or '-' for stdout.\n");
127 fprintf(stderr, " -F <capture type> set the output file type; default is libpcap.\n");
128 fprintf(stderr, " an empty \"-F\" option will list the file types.\n");
129 fprintf(stderr, " -T <encap type> set the output file encapsulation type;\n");
130 fprintf(stderr, " default is the same as the first input file.\n");
131 fprintf(stderr, " an empty \"-T\" option will list the encapsulation types.\n");
132 fprintf(stderr, "\n");
133 fprintf(stderr, "Miscellaneous:\n");
134 fprintf(stderr, " -h display this help and exit.\n");
135 fprintf(stderr, " -v verbose output.\n");
139 const char *sstr; /* The short string */
140 const char *lstr; /* The long string */
144 string_compare(gconstpointer a, gconstpointer b)
146 return strcmp(((const struct string_elem *)a)->sstr,
147 ((const struct string_elem *)b)->sstr);
151 string_elem_print(gpointer data, gpointer not_used _U_)
153 fprintf(stderr, " %s - %s\n",
154 ((struct string_elem *)data)->sstr,
155 ((struct string_elem *)data)->lstr);
159 list_capture_types(void) {
161 struct string_elem *captypes;
164 captypes = g_malloc(sizeof(struct string_elem) * WTAP_NUM_FILE_TYPES);
166 fprintf(stderr, "mergecap: The available capture file types for the \"-F\" flag are:\n");
167 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
168 if (wtap_dump_can_open(i)) {
169 captypes[i].sstr = wtap_file_type_short_string(i);
170 captypes[i].lstr = wtap_file_type_string(i);
171 list = g_slist_insert_sorted(list, &captypes[i], string_compare);
174 g_slist_foreach(list, string_elem_print, NULL);
180 list_encap_types(void) {
182 struct string_elem *encaps;
185 encaps = g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
186 fprintf(stderr, "mergecap: The available encapsulation types for the \"-T\" flag are:\n");
187 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
188 encaps[i].sstr = wtap_encap_short_string(i);
189 if (encaps[i].sstr != NULL) {
190 encaps[i].lstr = wtap_encap_string(i);
191 list = g_slist_insert_sorted(list, &encaps[i], string_compare);
194 g_slist_foreach(list, string_elem_print, NULL);
200 main(int argc, char *argv[])
204 gboolean do_append = FALSE;
205 gboolean verbose = FALSE;
206 int in_file_count = 0;
208 #ifdef PCAP_NG_DEFAULT
209 int file_type = WTAP_FILE_PCAPNG; /* default to pcap format */
211 int file_type = WTAP_FILE_PCAP; /* default to pcapng format */
215 merge_in_file_t *in_files = NULL, *in_file;
217 struct wtap_pkthdr *phdr, snap_phdr;
219 int open_err, read_err=0, write_err, close_err;
222 char *out_filename = NULL;
223 gboolean got_read_error = FALSE, got_write_error = FALSE;
227 arg_list_utf_16to8(argc, argv);
230 /* Process the options first */
231 while ((opt = getopt(argc, argv, "hvas:T:F:w:")) != -1) {
235 out_filename = optarg;
239 do_append = !do_append;
243 frame_type = wtap_short_string_to_encap(optarg);
244 if (frame_type < 0) {
245 fprintf(stderr, "mergecap: \"%s\" isn't a valid encapsulation type\n",
253 file_type = wtap_short_string_to_file_type(optarg);
255 fprintf(stderr, "mergecap: \"%s\" isn't a valid capture file type\n",
257 list_capture_types();
267 snaplen = get_positive_int(optarg, "snapshot length");
275 case '?': /* Bad options if GNU getopt */
278 list_capture_types();
293 /* check for proper args; at a minimum, must have an output
294 * filename and one input file
296 in_file_count = argc - optind;
298 fprintf(stderr, "mergecap: an output filename must be set with -w\n");
299 fprintf(stderr, " run with -h for help\n");
302 if (in_file_count < 1) {
303 fprintf(stderr, "mergecap: No input files were specified\n");
307 /* open the input files */
308 if (!merge_open_in_files(in_file_count, &argv[optind], &in_files,
309 &open_err, &err_info, &err_fileno)) {
310 fprintf(stderr, "mergecap: Can't open %s: %s\n", argv[optind + err_fileno],
311 wtap_strerror(open_err));
314 case WTAP_ERR_UNSUPPORTED:
315 case WTAP_ERR_UNSUPPORTED_ENCAP:
316 case WTAP_ERR_BAD_FILE:
317 fprintf(stderr, "(%s)\n", err_info);
325 for (i = 0; i < in_file_count; i++)
326 fprintf(stderr, "mergecap: %s is type %s.\n", argv[optind + i],
327 wtap_file_type_string(wtap_file_type(in_files[i].wth)));
332 * Snapshot length not specified - default to the maximum of the
333 * snapshot lengths of the input files.
335 snaplen = merge_max_snapshot_length(in_file_count, in_files);
338 /* set the outfile frame type */
339 if (frame_type == -2) {
341 * Default to the appropriate frame type for the input files.
343 frame_type = merge_select_frame_type(in_file_count, in_files);
345 if (frame_type == WTAP_ENCAP_PER_PACKET) {
347 * Find out why we had to choose WTAP_ENCAP_PER_PACKET.
349 int first_frame_type, this_frame_type;
351 first_frame_type = wtap_file_encap(in_files[0].wth);
352 for (i = 1; i < in_file_count; i++) {
353 this_frame_type = wtap_file_encap(in_files[i].wth);
354 if (first_frame_type != this_frame_type) {
355 fprintf(stderr, "mergecap: multiple frame encapsulation types detected\n");
356 fprintf(stderr, " defaulting to WTAP_ENCAP_PER_PACKET\n");
357 fprintf(stderr, " %s had type %s (%s)\n",
358 in_files[0].filename,
359 wtap_encap_string(first_frame_type),
360 wtap_encap_short_string(first_frame_type));
361 fprintf(stderr, " %s had type %s (%s)\n",
362 in_files[i].filename,
363 wtap_encap_string(this_frame_type),
364 wtap_encap_short_string(this_frame_type));
369 fprintf(stderr, "mergecap: selected frame_type %s (%s)\n",
370 wtap_encap_string(frame_type),
371 wtap_encap_short_string(frame_type));
375 /* open the outfile */
376 if (strncmp(out_filename, "-", 2) == 0) {
377 /* use stdout as the outfile */
378 out_fd = 1 /*stdout*/;
380 /* open the outfile */
381 out_fd = ws_open(out_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
383 fprintf(stderr, "mergecap: Couldn't open output file %s: %s\n",
384 out_filename, g_strerror(errno));
389 /* prepare the outfile */
390 pdh = wtap_dump_fdopen(out_fd, file_type, frame_type, snaplen, FALSE /* compressed */, &open_err);
392 merge_close_in_files(in_file_count, in_files);
394 fprintf(stderr, "mergecap: Can't open or create %s: %s\n", out_filename,
395 wtap_strerror(open_err));
399 /* do the merge (or append) */
403 in_file = merge_append_read_packet(in_file_count, in_files, &read_err,
406 in_file = merge_read_packet(in_file_count, in_files, &read_err,
408 if (in_file == NULL) {
414 /* I/O error reading from in_file */
415 got_read_error = TRUE;
420 fprintf(stderr, "Record: %u\n", count++);
422 /* We simply write it, perhaps after truncating it; we could do other
423 * things, like modify it. */
424 phdr = wtap_phdr(in_file->wth);
425 if (snaplen != 0 && phdr->caplen > snaplen) {
427 snap_phdr.caplen = snaplen;
431 if (!wtap_dump(pdh, phdr, wtap_pseudoheader(in_file->wth),
432 wtap_buf_ptr(in_file->wth), &write_err)) {
433 got_write_error = TRUE;
438 merge_close_in_files(in_file_count, in_files);
439 if (!got_read_error && !got_write_error) {
440 if (!wtap_dump_close(pdh, &write_err))
441 got_write_error = TRUE;
443 wtap_dump_close(pdh, &close_err);
445 if (got_read_error) {
447 * Find the file on which we got the error, and report the error.
449 for (i = 0; i < in_file_count; i++) {
450 if (in_files[i].state == GOT_ERROR) {
451 fprintf(stderr, "mergecap: Error reading %s: %s\n",
452 in_files[i].filename, wtap_strerror(read_err));
455 case WTAP_ERR_UNSUPPORTED:
456 case WTAP_ERR_UNSUPPORTED_ENCAP:
457 case WTAP_ERR_BAD_FILE:
458 fprintf(stderr, "(%s)\n", err_info);
466 if (got_write_error) {
469 case WTAP_ERR_UNSUPPORTED_ENCAP:
471 * This is a problem with the particular frame we're writing;
472 * note that, and give the frame number.
474 fprintf(stderr, "mergecap: Frame %u of \"%s\" has a network type that can't be saved in a file with that format\n.",
475 in_file->packet_num, in_file->filename);
479 fprintf(stderr, "mergecap: Error writing to outfile: %s\n",
480 wtap_strerror(write_err));
487 return (!got_read_error && !got_write_error) ? 0 : 2;