reordercap.c

   1 /* Reorder the frames from an input dump file, and write to output dump file.
   2  * Martin Mathieson and Jakub Jawadzki
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #include <config.h>
  12 #define WS_LOG_DOMAIN  LOG_DOMAIN_MAIN
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <glib.h>
  18
  19 #include <ws_exit_codes.h>
  20 #include <wsutil/ws_getopt.h>
  21
  22 #include <wiretap/wtap.h>
  23
  24 #include <wsutil/cmdarg_err.h>
  25 #include <wsutil/filesystem.h>
  26 #include <wsutil/file_util.h>
  27 #include <wsutil/privileges.h>
  28 #include <cli_main.h>
  29 #include <wsutil/version_info.h>
  30 #include <wiretap/wtap_opttypes.h>
  31
  32 #ifdef HAVE_PLUGINS
  33 #include <wsutil/plugins.h>
  34 #endif
  35
  36 #include <wsutil/wslog.h>
  37
  38 #include "ui/failure_message.h"
  39
  40 /* Additional exit codes */
  41 #define OUTPUT_FILE_ERROR 1
  42
  43 /* Show command-line usage */
  44 static void
  45 print_usage(FILE *output)
  46 {
  47     fprintf(output, "\n");
  48     fprintf(output, "Usage: reordercap [options] <infile> <outfile>\n");
  49     fprintf(output, "\n");
  50     fprintf(output, "Options:\n");
  51     fprintf(output, "  -n                don't write to output file if the input file is ordered.\n");
  52     fprintf(output, "  -h, --help        display this help and exit.\n");
  53     fprintf(output, "  -v, --version     print version information and exit.\n");
  54 }
  55
  56 /* Remember where this frame was in the file */
  57 typedef struct FrameRecord_t {
  58     int64_t      offset;
  59     unsigned     num;
  60
  61     nstime_t     frame_time;
  62 } FrameRecord_t;
  63
  64
  65 /**************************************************/
  66 /* Debugging only                                 */
  67
  68 /* Enable this symbol to see debug output */
  69 /* #define REORDER_DEBUG */
  70
  71 #ifdef REORDER_DEBUG
  72 #define DEBUG_PRINT printf
  73 #else
  74 #define DEBUG_PRINT(...)
  75 #endif
  76 /**************************************************/
  77
  78
  79 static void
  80 frame_write(FrameRecord_t *frame, wtap *wth, wtap_dumper *pdh,
  81             wtap_rec *rec, Buffer *buf, const char *infile,
  82             const char *outfile)
  83 {
  84     int    err;
  85     char   *err_info;
  86
  87     DEBUG_PRINT("\nDumping frame (offset=%" PRIu64 ")\n",
  88                 frame->offset);
  89
  90
  91     /* Re-read the frame from the stored location */
  92     if (!wtap_seek_read(wth, frame->offset, rec, buf, &err, &err_info)) {
  93         if (err != 0) {
  94             /* Print a message noting that the read failed somewhere along the line. */
  95             fprintf(stderr,
  96                     "reordercap: An error occurred while re-reading \"%s\".\n",
  97                     infile);
  98             cfile_read_failure_message(infile, err, err_info);
  99             exit(1);
 100         }
 101     }
 102
 103     /* Copy, and set length and timestamp from item. */
 104     /* TODO: remove when wtap_seek_read() fills in rec,
 105        including time stamps, for all file types  */
 106     rec->ts = frame->frame_time;
 107
 108     /* Dump frame to outfile */
 109     if (!wtap_dump(pdh, rec, ws_buffer_start_ptr(buf), &err, &err_info)) {
 110         cfile_write_failure_message(infile, outfile, err, err_info, frame->num,
 111                                     wtap_file_type_subtype(wth));
 112         exit(1);
 113     }
 114     wtap_rec_reset(rec);
 115 }
 116
 117 /* Comparing timestamps between 2 frames.
 118    negative if (t1 < t2)
 119    zero     if (t1 == t2)
 120    positive if (t1 > t2)
 121 */
 122 static int
 123 frames_compare(const void *a, const void *b)
 124 {
 125     const FrameRecord_t *frame1 = *(const FrameRecord_t *const *) a;
 126     const FrameRecord_t *frame2 = *(const FrameRecord_t *const *) b;
 127
 128     const nstime_t *time1 = &frame1->frame_time;
 129     const nstime_t *time2 = &frame2->frame_time;
 130
 131     return nstime_cmp(time1, time2);
 132 }
 133
 134 /********************************************************************/
 135 /* Main function.                                                   */
 136 /********************************************************************/
 137 int
 138 main(int argc, char *argv[])
 139 {
 140     char *configuration_init_error;
 141     wtap *wth = NULL;
 142     wtap_dumper *pdh = NULL;
 143     wtap_rec rec;
 144     Buffer buf;
 145     int err;
 146     char *err_info;
 147     int64_t data_offset;
 148     unsigned wrong_order_count = 0;
 149     bool write_output_regardless = true;
 150     unsigned i;
 151     wtap_dump_params params;
 152     int                          ret = EXIT_SUCCESS;
 153
 154     GPtrArray *frames;
 155     FrameRecord_t *prevFrame = NULL;
 156
 157     int opt;
 158     static const struct ws_option long_options[] = {
 159         {"help", ws_no_argument, NULL, 'h'},
 160         {"version", ws_no_argument, NULL, 'v'},
 161         {0, 0, 0, 0 }
 162     };
 163     int file_count;
 164     char *infile;
 165     const char *outfile;
 166
 167     /* Set the program name. */
 168     g_set_prgname("reordercap");
 169
 170     cmdarg_err_init(stderr_cmdarg_err, stderr_cmdarg_err_cont);
 171
 172     /* Initialize log handler early so we can have proper logging during startup. */
 173     ws_log_init(vcmdarg_err);
 174
 175     /* Early logging command-line initialization. */
 176     ws_log_parse_args(&argc, argv, vcmdarg_err, WS_EXIT_INVALID_OPTION);
 177
 178     ws_noisy("Finished log init and parsing command line log arguments");
 179
 180     /*
 181      * Get credential information for later use.
 182      */
 183     init_process_policies();
 184
 185     /*
 186      * Attempt to get the pathname of the directory containing the
 187      * executable file.
 188      */
 189     configuration_init_error = configuration_init(argv[0]);
 190     if (configuration_init_error != NULL) {
 191         fprintf(stderr,
 192                 "reordercap: Can't get pathname of directory containing the reordercap program: %s.\n",
 193                 configuration_init_error);
 194         g_free(configuration_init_error);
 195     }
 196
 197     /* Initialize the version information. */
 198     ws_init_version_info("Reordercap", NULL, NULL);
 199
 200     init_report_failure_message("reordercap");
 201
 202     wtap_init(true);
 203
 204     /* Process the options first */
 205     while ((opt = ws_getopt_long(argc, argv, "hnv", long_options, NULL)) != -1) {
 206         switch (opt) {
 207             case 'n':
 208                 write_output_regardless = false;
 209                 break;
 210             case 'h':
 211                 show_help_header("Reorder timestamps of input file frames into output file.");
 212                 print_usage(stdout);
 213                 goto clean_exit;
 214             case 'v':
 215                 show_version();
 216                 goto clean_exit;
 217             case '?':
 218                 print_usage(stderr);
 219                 ret = WS_EXIT_INVALID_OPTION;
 220                 goto clean_exit;
 221         }
 222     }
 223
 224     /* Remaining args are file names */
 225     file_count = argc - ws_optind;
 226     if (file_count == 2) {
 227         infile  = argv[ws_optind];
 228         outfile = argv[ws_optind+1];
 229     }
 230     else {
 231         print_usage(stderr);
 232         ret = WS_EXIT_INVALID_OPTION;
 233         goto clean_exit;
 234     }
 235
 236     /* Open infile */
 237     /* TODO: if reordercap is ever changed to give the user a choice of which
 238        open_routine reader to use, then the following needs to change. */
 239     wth = wtap_open_offline(infile, WTAP_TYPE_AUTO, &err, &err_info, true);
 240     if (wth == NULL) {
 241         cfile_open_failure_message(infile, err, err_info);
 242         ret = WS_EXIT_OPEN_ERROR;
 243         goto clean_exit;
 244     }
 245     DEBUG_PRINT("file_type_subtype is %d\n", wtap_file_type_subtype(wth));
 246
 247     /* Allocate the array of frame pointers. */
 248     frames = g_ptr_array_new();
 249
 250     /* Read each frame from infile */
 251     wtap_rec_init(&rec);
 252     ws_buffer_init(&buf, 1514);
 253     while (wtap_read(wth, &rec, &buf, &err, &err_info, &data_offset)) {
 254         FrameRecord_t *newFrameRecord;
 255
 256         newFrameRecord = g_slice_new(FrameRecord_t);
 257         newFrameRecord->num = frames->len + 1;
 258         newFrameRecord->offset = data_offset;
 259         if (rec.presence_flags & WTAP_HAS_TS) {
 260             newFrameRecord->frame_time = rec.ts;
 261         } else {
 262             nstime_set_unset(&newFrameRecord->frame_time);
 263         }
 264
 265         if (prevFrame && frames_compare(&newFrameRecord, &prevFrame) < 0) {
 266            wrong_order_count++;
 267         }
 268
 269         g_ptr_array_add(frames, newFrameRecord);
 270         prevFrame = newFrameRecord;
 271         wtap_rec_reset(&rec);
 272     }
 273     wtap_rec_cleanup(&rec);
 274     ws_buffer_free(&buf);
 275     if (err != 0) {
 276       /* Print a message noting that the read failed somewhere along the line. */
 277       cfile_read_failure_message(infile, err, err_info);
 278     }
 279
 280     printf("%u frames, %u out of order\n", frames->len, wrong_order_count);
 281
 282     wtap_dump_params_init(&params, wth);
 283
 284     /* Sort the frames */
 285     /* XXX - Does this handle multiple SHBs correctly? */
 286     if (wrong_order_count > 0) {
 287         g_ptr_array_sort(frames, frames_compare);
 288     }
 289
 290
 291     /* Avoid writing if already sorted and configured to */
 292     if (write_output_regardless || (wrong_order_count > 0)) {
 293         /* Open outfile (same filetype/encap as input file) */
 294         if (strcmp(outfile, "-") == 0) {
 295           pdh = wtap_dump_open_stdout(wtap_file_type_subtype(wth),
 296                                       WTAP_UNCOMPRESSED, &params, &err, &err_info);
 297         } else {
 298           pdh = wtap_dump_open(outfile, wtap_file_type_subtype(wth),
 299                                WTAP_UNCOMPRESSED, &params, &err, &err_info);
 300         }
 301         g_free(params.idb_inf);
 302         params.idb_inf = NULL;
 303
 304         if (pdh == NULL) {
 305             cfile_dump_open_failure_message(outfile, err, err_info,
 306                                             wtap_file_type_subtype(wth));
 307             wtap_dump_params_cleanup(&params);
 308             ret = OUTPUT_FILE_ERROR;
 309             goto clean_exit;
 310         }
 311
 312
 313         /* Write out each sorted frame in turn */
 314         wtap_rec_init(&rec);
 315         ws_buffer_init(&buf, 1514);
 316         for (i = 0; i < frames->len; i++) {
 317             FrameRecord_t *frame = (FrameRecord_t *)frames->pdata[i];
 318
 319             frame_write(frame, wth, pdh, &rec, &buf, infile, outfile);
 320
 321             g_slice_free(FrameRecord_t, frame);
 322         }
 323
 324         wtap_rec_cleanup(&rec);
 325         ws_buffer_free(&buf);
 326
 327
 328
 329         /* Close outfile */
 330         if (!wtap_dump_close(pdh, NULL, &err, &err_info)) {
 331             cfile_close_failure_message(outfile, err, err_info);
 332             wtap_dump_params_cleanup(&params);
 333             ret = OUTPUT_FILE_ERROR;
 334             goto clean_exit;
 335         }
 336     } else {
 337         printf("Not writing output file because input file is already in order.\n");
 338
 339         /* Free frame memory */
 340         for (i = 0; i < frames->len; i++) {
 341             FrameRecord_t *frame = (FrameRecord_t *)frames->pdata[i];
 342
 343             g_slice_free(FrameRecord_t, frame);
 344         }
 345     }
 346
 347
 348     /* Free the whole array */
 349     g_ptr_array_free(frames, TRUE);
 350
 351     wtap_dump_params_cleanup(&params);
 352
 353     /* Finally, close infile and release resources. */
 354     wtap_close(wth);
 355
 356 clean_exit:
 357     wtap_cleanup();
 358     free_progdirs();
 359     return ret;
 360 }
 361
 362 /*
 363  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 364  *
 365  * Local variables:
 366  * c-basic-offset: 4
 367  * tab-width: 8
 368  * indent-tabs-mode: nil
 369  * End:
 370  *
 371  * vi: set shiftwidth=4 tabstop=8 expandtab:
 372  * :indentSize=4:tabSize=8:noTabs=true:
 373  */