aboutsummaryrefslogtreecommitdiffstats
path: root/reordercap.c
blob: 57741e9ceab44bc6634c5fee24ca7d5238684103 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
/* Reorder the frames from an input dump file, and write to output dump file.
 * Martin Mathieson and Jakub Jawadzki
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "wtap.h"

#ifndef HAVE_GETOPT
#include "wsutil/wsgetopt.h"
#endif

/* Show command-line usage */
static void usage(gboolean is_error)
{
    FILE *output;

    if (!is_error) {
        output = stdout;
    }
    else {
        output = stderr;
    }

    fprintf(output, "Reordercap %s"
#ifdef GITVERSION
                      " (" GITVERSION " from " GITBRANCH ")"
#endif
                      "\n", VERSION);
    fprintf(output, "Reorder timestamps of input file frames into output file.\n");
    fprintf(output, "See http://www.wireshark.org for more information.\n");
    fprintf(output, "\n");
    fprintf(output, "Usage: reordercap [options] <infile> <outfile>\n");
    fprintf(output, "\n");
    fprintf(output, "Options:\n");
    fprintf(output, "  -n        don't write to output file if the input file is ordered.\n");
    fprintf(output, "  -h        display this help and exit.\n");
}

/* Remember where this frame was in the file */
typedef struct FrameRecord_t {
    gint64       offset;
    guint        num;

    nstime_t     time;
} FrameRecord_t;


/**************************************************/
/* Debugging only                                 */

/* Enable this symbol to see debug output */
/* #define REORDER_DEBUG */

#ifdef REORDER_DEBUG
#define DEBUG_PRINT printf
#else
#define DEBUG_PRINT(...)
#endif
/**************************************************/


static void
frame_write(FrameRecord_t *frame, wtap *wth, wtap_dumper *pdh, Buffer *buf,
            const char *infile)
{
    int    err;
    gchar  *err_info;
    struct wtap_pkthdr phdr;

    DEBUG_PRINT("\nDumping frame (offset=%" G_GINT64_MODIFIER "u)\n",
                frame->offset);


    /* Re-read the first frame from the stored location */
    if (!wtap_seek_read(wth, frame->offset, &phdr, buf, &err, &err_info)) {
        if (err != 0) {
            /* Print a message noting that the read failed somewhere along the line. */
            fprintf(stderr,
                    "reordercap: An error occurred while re-reading \"%s\": %s.\n",
                    infile, wtap_strerror(err));
            switch (err) {

            case WTAP_ERR_UNSUPPORTED:
            case WTAP_ERR_UNSUPPORTED_ENCAP:
            case WTAP_ERR_BAD_FILE:
                fprintf(stderr, "(%s)\n", err_info);
                g_free(err_info);
                break;
            }
            exit(1);
        }
    }

    /* Copy, and set length and timestamp from item. */
    /* TODO: remove when wtap_seek_read() will read phdr */
    phdr.ts = frame->time;

    /* Dump frame to outfile */
    if (!wtap_dump(pdh, &phdr, buffer_start_ptr(buf), &err)) {
        fprintf(stderr, "reordercap: Error (%s) writing frame to outfile\n",
                wtap_strerror(err));
        exit(1);
    }
}

/* Comparing timestamps between 2 frames.
   -1 if (t1 < t2)
   0  if (t1 == t2)
   1  if (t1 > t2)
*/
static int
frames_compare(gconstpointer a, gconstpointer b)
{
    const FrameRecord_t *frame1 = *(const FrameRecord_t *const *) a;
    const FrameRecord_t *frame2 = *(const FrameRecord_t *const *) b;

    const nstime_t *time1 = &frame1->time;
    const nstime_t *time2 = &frame2->time;

    if (time1->secs > time2->secs)
        return 1;
    if (time1->secs < time2->secs)
        return -1;

    /* time1->secs == time2->secs */
    if (time1->nsecs > time2->nsecs)
        return 1;
    if (time1->nsecs < time2->nsecs)
        return -1;

    /* time1->nsecs == time2->nsecs */

    if (frame1->num > frame2->num)
        return 1;
    if (frame1->num < frame2->num)
        return -1;
    return 0;
}


/********************************************************************/
/* Main function.                                                   */
/********************************************************************/
int main(int argc, char *argv[])
{
    wtap *wth = NULL;
    wtap_dumper *pdh = NULL;
    Buffer buf;
    int err;
    gchar *err_info;
    gint64 data_offset;
    const struct wtap_pkthdr *phdr;
    guint wrong_order_count = 0;
    gboolean write_output_regardless = TRUE;
    guint i;
    wtapng_section_t            *shb_hdr;
    wtapng_iface_descriptions_t *idb_inf;

    GPtrArray *frames;
    FrameRecord_t *prevFrame = NULL;

    int opt;
    int file_count;
    char *infile;
    char *outfile;

    /* Process the options first */
    while ((opt = getopt(argc, argv, "hn")) != -1) {
        switch (opt) {
            case 'n':
                write_output_regardless = FALSE;
                break;
            case 'h':
                usage(FALSE);
                exit(0);
            case '?':
                usage(TRUE);
                exit(1);
        }
    }

    /* Remaining args are file names */
    file_count = argc - optind;
    if (file_count == 2) {
        infile  = argv[optind];
        outfile = argv[optind+1];
    }
    else {
        usage(TRUE);
        exit(1);
    }

    /* Open infile */
    wth = wtap_open_offline(infile, &err, &err_info, TRUE);
    if (wth == NULL) {
        fprintf(stderr, "reordercap: Can't open %s: %s\n", infile,
                wtap_strerror(err));
        switch (err) {

        case WTAP_ERR_UNSUPPORTED:
        case WTAP_ERR_UNSUPPORTED_ENCAP:
        case WTAP_ERR_BAD_FILE:
            fprintf(stderr, "(%s)\n", err_info);
            g_free(err_info);
            break;
        }
        exit(1);
    }
    DEBUG_PRINT("file_type_subtype is %u\n", wtap_file_type_subtype(wth));

    shb_hdr = wtap_file_get_shb_info(wth);
    idb_inf = wtap_file_get_idb_info(wth);

    /* Open outfile (same filetype/encap as input file) */
    pdh = wtap_dump_open_ng(outfile, wtap_file_type_subtype(wth), wtap_file_encap(wth),
                            65535, FALSE, shb_hdr, idb_inf, &err);
    g_free(idb_inf);
    if (pdh == NULL) {
        fprintf(stderr, "reordercap: Failed to open output file: (%s) - error %s\n",
                outfile, wtap_strerror(err));
        g_free(shb_hdr);
        exit(1);
    }

    /* Allocate the array of frame pointers. */
    frames = g_ptr_array_new();

    /* Read each frame from infile */
    while (wtap_read(wth, &err, &err_info, &data_offset)) {
        FrameRecord_t *newFrameRecord;

        phdr = wtap_phdr(wth);

        newFrameRecord = g_slice_new(FrameRecord_t);
        newFrameRecord->num = frames->len + 1;
        newFrameRecord->offset = data_offset;
        newFrameRecord->time = phdr->ts;

        if (prevFrame && frames_compare(&newFrameRecord, &prevFrame) < 0) {
           wrong_order_count++;
        }

        g_ptr_array_add(frames, newFrameRecord);
        prevFrame = newFrameRecord;
    }
    if (err != 0) {
      /* Print a message noting that the read failed somewhere along the line. */
      fprintf(stderr,
              "reordercap: An error occurred while reading \"%s\": %s.\n",
              infile, wtap_strerror(err));
      switch (err) {

      case WTAP_ERR_UNSUPPORTED:
      case WTAP_ERR_UNSUPPORTED_ENCAP:
      case WTAP_ERR_BAD_FILE:
          fprintf(stderr, "(%s)\n", err_info);
          g_free(err_info);
          break;
      }
    }

    printf("%u frames, %u out of order\n", frames->len, wrong_order_count);

    /* Sort the frames */
    if (wrong_order_count > 0) {
        g_ptr_array_sort(frames, frames_compare);
    }

    /* Write out each sorted frame in turn */
    buffer_init(&buf, 1500);
    for (i = 0; i < frames->len; i++) {
        FrameRecord_t *frame = (FrameRecord_t *)frames->pdata[i];

        /* Avoid writing if already sorted and configured to */
        if (write_output_regardless || (wrong_order_count > 0)) {
            frame_write(frame, wth, pdh, &buf, infile);
        }
        g_slice_free(FrameRecord_t, frame);
    }
    buffer_free(&buf);

    if (!write_output_regardless && (wrong_order_count == 0)) {
        printf("Not writing output file because input file is already in order!\n");
    }

    /* Free the whole array */
    g_ptr_array_free(frames, TRUE);

    /* Close outfile */
    if (!wtap_dump_close(pdh, &err)) {
        fprintf(stderr, "reordercap: Error closing %s: %s\n", outfile,
                wtap_strerror(err));
        g_free(shb_hdr);
        exit(1);
    }
    g_free(shb_hdr);

    /* Finally, close infile */
    wtap_fdclose(wth);

    return 0;
}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */