1 /* Combine two dump files, either by appending or by merging by timestamp
3 * $Id: mergecap.c,v 1.14 2004/01/18 02:12:59 jmayer Exp $
5 * Written by Scott Renfro <scott@renfro.org> based on
6 * editcap by Richard Sharpe and Guy Harris
22 #ifdef HAVE_SYS_TIME_H
33 #include "cvsversion.h"
38 static int verbose = 0; /* Not so verbose */
41 * Structures to manage our files
43 typedef struct in_file_t {
51 typedef struct out_file_t {
59 static out_file_t out_file;
62 * Routine to write frame to output file
65 write_frame(guchar *user, const struct wtap_pkthdr *phdr, long offset _U_,
66 union wtap_pseudo_header *pseudo_header, const guchar *buf)
68 wtap_dumper *pdh = (wtap_dumper*)user;
70 struct wtap_pkthdr snap_phdr;
73 printf("Record: %u\n", out_file.count++);
75 /* We simply write it, perhaps after truncating it; we could do other
76 * things, like modify it. */
77 if (out_file.snaplen != 0 && phdr->caplen > out_file.snaplen) {
79 snap_phdr.caplen = out_file.snaplen;
83 if (!wtap_dump(pdh, phdr, pseudo_header, buf, &err)) {
84 fprintf(stderr, "mergecap: Error writing to %s: %s\n",
85 out_file.filename, wtap_strerror(err));
92 * routine to concatenate files
95 append(int count, in_file_t in_files[], out_file_t *out_file)
100 for (i = 0; i < count; i++) {
101 if (!wtap_loop(in_files[i].wth, 0, write_frame,
102 (guchar*)out_file->pdh, &err)) {
103 fprintf(stderr, "mergecap: Error appending from %s to %s: %s\n",
104 in_files[i].filename, out_file->filename, wtap_strerror(err));
111 * returns TRUE if first argument is earlier than second
114 is_earlier(struct timeval *l, struct timeval *r) {
115 if (l->tv_sec > r->tv_sec) { /* left is later */
117 } else if (l->tv_sec < r->tv_sec) { /* left is earlier */
119 } else if (l->tv_usec > r->tv_usec) { /* tv_sec equal, l.usec later */
122 /* either one < two or one == two
123 * either way, return one
130 * returns index of earliest timestamp in set of input files
131 * or -1 if no valid files remain
134 earliest(int count, in_file_t in_files[]) {
137 struct timeval tv = {LONG_MAX, LONG_MAX};
139 for (i = 0; i < count; i++) {
140 struct wtap_pkthdr *phdr = wtap_phdr(in_files[i].wth);
142 if (in_files[i].ok && is_earlier(&(phdr->ts), &tv)) {
151 * actually merge the files
154 merge(int count, in_file_t in_files[], out_file_t *out_file)
158 /* prime the pump (read in first frame from each file) */
159 for (i = 0; i < count; i++) {
160 in_files[i].ok = wtap_read(in_files[i].wth, &(in_files[i].err),
161 &(in_files[i].data_offset));
164 /* now keep writing the earliest frame until we're out of frames */
165 while ( -1 != (i = earliest(count, in_files))) {
167 /* write out earliest frame, and fetch another from its
170 write_frame((guchar*)out_file->pdh,
171 wtap_phdr(in_files[i].wth),
172 in_files[i].data_offset,
173 wtap_pseudoheader(in_files[i].wth),
174 wtap_buf_ptr(in_files[i].wth));
175 in_files[i].ok = wtap_read(in_files[i].wth, &(in_files[i].err),
176 &(in_files[i].data_offset));
182 * Select an output frame type based on the input files
183 * From Guy: If all files have the same frame type, then use that.
184 * Otherwise select WTAP_ENCAP_PER_PACKET. If the selected
185 * output file type doesn't support per packet frame types,
186 * then the wtap_dump_open call will fail with a reasonable
190 select_frame_type(int count, in_file_t files[])
193 int selected_frame_type;
195 selected_frame_type = wtap_file_encap(files[0].wth);
197 for (i = 1; i < count; i++) {
198 int this_frame_type = wtap_file_encap(files[i].wth);
199 if (selected_frame_type != this_frame_type) {
200 selected_frame_type = WTAP_ENCAP_PER_PACKET;
202 fprintf(stderr, "mergecap: multiple frame encapsulation types detected\n");
203 fprintf(stderr, " defaulting to WTAP_ENCAP_PER_PACKET\n");
204 fprintf(stderr, " %s had type %s (%s)\n",
206 wtap_encap_string(selected_frame_type),
207 wtap_encap_short_string(selected_frame_type));
208 fprintf(stderr, " %s had type %s (%s)\n",
210 wtap_encap_string(this_frame_type),
211 wtap_encap_short_string(this_frame_type));
218 fprintf(stderr, "mergecap: selected frame_type %s (%s)\n",
219 wtap_encap_string(selected_frame_type),
220 wtap_encap_short_string(selected_frame_type));
223 return selected_frame_type;
228 * Close the output file
231 close_outfile(out_file_t *out_file)
234 if (!wtap_dump_close(out_file->pdh, &err)) {
235 fprintf(stderr, "mergecap: Error closing file %s: %s\n",
236 out_file->filename, wtap_strerror(err));
243 * Open the output file
245 * Return FALSE if file cannot be opened (so caller can clean up)
248 open_outfile(out_file_t *out_file, int snapshot_len)
252 fprintf(stderr, "mergecap: internal error (null out_file)\n");
256 out_file->pdh = wtap_dump_open(out_file->filename, out_file->file_type,
257 out_file->frame_type, snapshot_len, &err);
258 if (!out_file->pdh) {
259 fprintf(stderr, "mergecap: Can't open/create %s:\n", out_file->filename);
260 fprintf(stderr, " %s\n", wtap_strerror(err));
268 * Scan through input files and find maximum snapshot length
271 max_snapshot_length(int count, in_file_t in_files[])
274 int max_snapshot = 0;
277 for (i = 0; i < count; i++) {
278 snapshot_length = wtap_snapshot_length(in_files[i].wth);
279 if (snapshot_length == 0) {
280 /* Snapshot length of input file not known. */
281 snapshot_length = WTAP_MAX_PACKET_SIZE;
283 if (snapshot_length > max_snapshot)
284 max_snapshot = snapshot_length;
291 * Scan through and close each input file
294 close_in_files(int count, in_file_t in_files[])
297 for (i = 0; i < count; i++) {
298 wtap_close(in_files[i].wth);
304 * Scan through the arguments and open the input files
307 open_in_files(int argc, char *argv[], in_file_t *in_files[])
313 int files_size = argc * sizeof(in_file_t);
316 files = malloc(files_size);
318 fprintf(stderr, "mergecap: error allocating %d bytes of memory\n",
324 for (i = 0; i < argc; i++) {
325 files[count].filename = argv[i];
326 files[count].wth = wtap_open_offline(argv[i], &err, FALSE);
327 files[count].err = 0;
328 files[count].data_offset = 0;
329 files[count].ok = TRUE;
330 if (!files[count].wth) {
331 fprintf(stderr, "mergecap: skipping %s: %s\n", argv[i],
335 fprintf(stderr, "mergecap: %s is type %s.\n", argv[i],
336 wtap_file_type_string(wtap_file_type(files[count].wth)));
342 fprintf(stderr, "mergecap: opened %d of %d input files\n", count,
358 printf("Usage: mergecap [-hva] [-s <snaplen>] [-T <encap type>]\n");
359 printf(" [-F <capture type>] -w <outfile> <infile> [...]\n\n");
360 printf(" where\t-h produces this help listing.\n");
361 printf(" \t-v verbose operation, default is silent\n");
362 printf(" \t-a files should be concatenated, not merged\n");
363 printf(" \t Default merges based on frame timestamps\n");
364 printf(" \t-s <snaplen>: truncate packets to <snaplen> bytes of data\n");
365 printf(" \t-w <outfile>: sets output filename to <outfile>\n");
366 printf(" \t-T <encap type> encapsulation type to use:\n");
367 for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
368 string = wtap_encap_short_string(i);
370 printf(" \t %s - %s\n",
371 string, wtap_encap_string(i));
373 printf(" \t default is the same as the first input file\n");
374 printf(" \t-F <capture type> capture file type to write:\n");
375 for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
376 if (wtap_dump_can_open(i))
377 printf(" \t %s - %s\n",
378 wtap_file_type_short_string(i), wtap_file_type_string(i));
380 printf(" \t default is libpcap\n");
386 main(int argc, char *argv[])
392 gboolean do_append = FALSE;
393 int in_file_count = 0;
394 in_file_t *in_files = NULL;
396 /* initialize out_file */
397 out_file.filename = NULL;
398 out_file.pdh = NULL; /* wiretap dumpfile */
399 out_file.file_type = WTAP_FILE_PCAP; /* default to "libpcap" */
400 out_file.frame_type = -2; /* leave type alone */
401 out_file.snaplen = 0; /* no limit */
402 out_file.count = 1; /* frames output */
404 /* Process the options first */
405 while ((opt = getopt(argc, argv, "hvas:T:F:w:")) != -1) {
409 out_file.filename = optarg;
413 do_append = !do_append;
417 out_file.frame_type = wtap_short_string_to_encap(optarg);
418 if (out_file.frame_type < 0) {
419 fprintf(stderr, "mergecap: \"%s\" is not a valid encapsulation type\n",
426 out_file.file_type = wtap_short_string_to_file_type(optarg);
427 if (out_file.file_type < 0) {
428 fprintf(stderr, "mergecap: \"%s\" is not a valid capture file type\n",
435 verbose = !verbose; /* Just invert */
439 out_file.snaplen = strtol(optarg, &p, 10);
440 if (p == optarg || *p != '\0') {
441 fprintf(stderr, "mergecap: \"%s\" is not a valid snapshot length\n",
448 printf("mergecap version %s"
450 " (cvs " CVSVERSION ")"
457 case '?': /* Bad options if GNU getopt */
466 /* check for proper args; at a minimum, must have an output
467 * filename and one input file
469 in_file_count = argc - optind;
470 if (!out_file.filename) {
471 fprintf(stderr, "mergecap: an output filename must be set with -w\n");
472 fprintf(stderr, " run with -h for help\n");
476 /* open the input files */
477 in_file_count = open_in_files(in_file_count, &argv[optind], &in_files);
478 if (in_file_count < 1) {
479 fprintf(stderr, "mergecap: No valid input files\n");
483 /* set the outfile frame type */
484 if (out_file.frame_type == -2)
485 out_file.frame_type = select_frame_type(in_file_count, in_files);
487 /* open the outfile */
488 if (!open_outfile(&out_file, max_snapshot_length(in_file_count, in_files))) {
489 close_in_files(in_file_count, in_files);
493 /* do the merge (or append) */
495 append(in_file_count, in_files, &out_file);
497 merge(in_file_count, in_files, &out_file);
499 close_in_files(in_file_count, in_files);
500 close_outfile(&out_file);