editcap.c

   1 /* editcap.c
   2  * Edit capture files.  We can delete packets, adjust timestamps, or
   3  * simply convert from one format to another format.
   4  *
   5  * Originally written by Richard Sharpe.
   6  * Improved by Guy Harris.
   7  * Further improved by Richard Sharpe.
   8  *
   9  * Copyright 2013, Richard Sharpe <realrichardsharpe[AT]gmail.com>
  10  *
  11  * Wireshark - Network traffic analyzer
  12  * By Gerald Combs <gerald@wireshark.org>
  13  * Copyright 1998 Gerald Combs
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License along
  26  * with this program; if not, write to the Free Software Foundation, Inc.,
  27  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  28  */
  29
  30 #include <config.h>
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <stdarg.h>
  36
  37 /*
  38  * Just make sure we include the prototype for strptime as well
  39  * (needed for glibc 2.2) but make sure we do this only if not
  40  * yet defined.
  41  */
  42
  43 #ifndef __USE_XOPEN
  44 #  define __USE_XOPEN
  45 #endif
  46
  47 #include <time.h>
  48 #include <glib.h>
  49
  50 #ifdef HAVE_UNISTD_H
  51 #include <unistd.h>
  52 #endif
  53
  54 #ifdef HAVE_GETOPT_H
  55 #include <getopt.h>
  56 #endif
  57
  58 #include <wiretap/wtap.h>
  59
  60 #include "epan/etypes.h"
  61
  62 #ifndef HAVE_GETOPT_LONG
  63 #include "wsutil/wsgetopt.h"
  64 #endif
  65
  66 #ifdef _WIN32
  67 #include <wsutil/unicode-utils.h>
  68 #include <process.h>    /* getpid */
  69 #ifdef HAVE_WINSOCK2_H
  70 #include <winsock2.h>
  71 #endif
  72 #endif
  73
  74 #ifndef HAVE_STRPTIME
  75 # include "wsutil/strptime.h"
  76 #endif
  77
  78 #include <wsutil/crash_info.h>
  79 #include <wsutil/clopts_common.h>
  80 #include <wsutil/cmdarg_err.h>
  81 #include <wsutil/filesystem.h>
  82 #include <wsutil/file_util.h>
  83 #include <wsutil/wsgcrypt.h>
  84 #include <wsutil/plugins.h>
  85 #include <wsutil/privileges.h>
  86 #include <wsutil/report_err.h>
  87 #include <wsutil/strnatcmp.h>
  88 #include <wsutil/str_util.h>
  89 #include <ws_version_info.h>
  90 #include <wsutil/pint.h>
  91 #include <wsutil/strtoi.h>
  92 #include <wiretap/wtap_opttypes.h>
  93 #include <wiretap/pcapng.h>
  94
  95 #include "ringbuffer.h" /* For RINGBUFFER_MAX_NUM_FILES */
  96
  97 #define INVALID_OPTION 1
  98 #define INVALID_FILE 2
  99 #define CANT_EXTRACT_PREFIX 2
 100 #define WRITE_ERROR 2
 101 #define DUMP_ERROR 2
 102
 103 /*
 104  * Some globals so we can pass things to various routines
 105  */
 106
 107 struct select_item {
 108     gboolean inclusive;
 109     guint first, second;
 110 };
 111
 112 /*
 113  * Duplicate frame detection
 114  */
 115 typedef struct _fd_hash_t {
 116     guint8     digest[16];
 117     guint32    len;
 118     nstime_t   frame_time;
 119 } fd_hash_t;
 120
 121 #define DEFAULT_DUP_DEPTH       5   /* Used with -d */
 122 #define MAX_DUP_DEPTH     1000000   /* the maximum window (and actual size of fd_hash[]) for de-duplication */
 123
 124 static fd_hash_t fd_hash[MAX_DUP_DEPTH];
 125 static int       dup_window    = DEFAULT_DUP_DEPTH;
 126 static int       cur_dup_entry = 0;
 127
 128 static guint32   ignored_bytes  = 0;  /* Used with -I */
 129
 130 #define ONE_BILLION 1000000000
 131
 132 /* Weights of different errors we can introduce */
 133 /* We should probably make these command-line arguments */
 134 /* XXX - Should we add a bit-level error? */
 135 #define ERR_WT_BIT      5   /* Flip a random bit */
 136 #define ERR_WT_BYTE     5   /* Substitute a random byte */
 137 #define ERR_WT_ALNUM    5   /* Substitute a random character in [A-Za-z0-9] */
 138 #define ERR_WT_FMT      2   /* Substitute "%s" */
 139 #define ERR_WT_AA       1   /* Fill the remainder of the buffer with 0xAA */
 140 #define ERR_WT_TOTAL    (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
 141
 142 #define ALNUM_CHARS     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
 143 #define ALNUM_LEN       (sizeof(ALNUM_CHARS) - 1)
 144
 145 struct time_adjustment {
 146     nstime_t tv;
 147     int is_negative;
 148 };
 149
 150 typedef struct _chop_t {
 151     int len_begin;
 152     int off_begin_pos;
 153     int off_begin_neg;
 154     int len_end;
 155     int off_end_pos;
 156     int off_end_neg;
 157 } chop_t;
 158
 159
 160 /* Table of user comments */
 161 GTree *frames_user_comments = NULL;
 162
 163 #define MAX_SELECTIONS 512
 164 static struct select_item     selectfrm[MAX_SELECTIONS];
 165 static guint                  max_selected              = 0;
 166 static int                    keep_em                   = 0;
 167 #ifdef PCAP_NG_DEFAULT
 168 static int                    out_file_type_subtype     = WTAP_FILE_TYPE_SUBTYPE_PCAPNG; /* default to pcapng   */
 169 #else
 170 static int                    out_file_type_subtype     = WTAP_FILE_TYPE_SUBTYPE_PCAP; /* default to pcap     */
 171 #endif
 172 static int                    out_frame_type            = -2; /* Leave frame type alone */
 173 static int                    verbose                   = 0;  /* Not so verbose         */
 174 static struct time_adjustment time_adj                  = {{0, 0}, 0}; /* no adjustment */
 175 static nstime_t               relative_time_window      = {0, 0}; /* de-dup time window */
 176 static double                 err_prob                  = 0.0;
 177 static time_t                 starttime                 = 0;
 178 static time_t                 stoptime                  = 0;
 179 static gboolean               check_startstop           = FALSE;
 180 static gboolean               rem_vlan                  = FALSE;
 181 static gboolean               dup_detect                = FALSE;
 182 static gboolean               dup_detect_by_time        = FALSE;
 183
 184 static int                    do_strict_time_adjustment = FALSE;
 185 static struct time_adjustment strict_time_adj           = {{0, 0}, 0}; /* strict time adjustment */
 186 static nstime_t               previous_time             = {0, 0}; /* previous time */
 187
 188 static int find_dct2000_real_data(guint8 *buf);
 189 static void handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
 190                             const struct wtap_pkthdr *in_phdr, guint8 **buf,
 191                             gboolean adjlen);
 192
 193 static gchar *
 194 abs_time_to_str_with_sec_resolution(const nstime_t *abs_time)
 195 {
 196     struct tm *tmp;
 197     gchar     *buf = (gchar *)g_malloc(16);
 198
 199     tmp = localtime(&abs_time->secs);
 200
 201     if (tmp) {
 202         g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
 203             tmp->tm_year + 1900,
 204             tmp->tm_mon+1,
 205             tmp->tm_mday,
 206             tmp->tm_hour,
 207             tmp->tm_min,
 208             tmp->tm_sec);
 209     } else {
 210         buf[0] = '\0';
 211     }
 212
 213     return buf;
 214 }
 215
 216 static gchar *
 217 fileset_get_filename_by_pattern(guint idx, const struct wtap_pkthdr *phdr,
 218                                 gchar *fprefix, gchar *fsuffix)
 219 {
 220     gchar  filenum[5+1];
 221     gchar *timestr;
 222     gchar *abs_str;
 223
 224     g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
 225     if (phdr->presence_flags & WTAP_HAS_TS) {
 226         timestr = abs_time_to_str_with_sec_resolution(&phdr->ts);
 227         abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
 228         g_free(timestr);
 229     } else
 230         abs_str = g_strconcat(fprefix, "_", filenum, fsuffix, NULL);
 231
 232     return abs_str;
 233 }
 234
 235 static gboolean
 236 fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
 237 {
 238     char  *pfx, *last_pathsep;
 239     gchar *save_file;
 240
 241     save_file = g_strdup(fname);
 242     if (save_file == NULL) {
 243         fprintf(stderr, "editcap: Out of memory\n");
 244         return FALSE;
 245     }
 246
 247     last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
 248     pfx = strrchr(save_file,'.');
 249     if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
 250         /* The pathname has a "." in it, and it's in the last component
 251          * of the pathname (because there is either only one component,
 252          * i.e. last_pathsep is null as there are no path separators,
 253          * or the "." is after the path separator before the last
 254          * component.
 255
 256          * Treat it as a separator between the rest of the file name and
 257          * the file name suffix, and arrange that the names given to the
 258          * ring buffer files have the specified suffix, i.e. put the
 259          * changing part of the name *before* the suffix. */
 260         pfx[0] = '\0';
 261         *fprefix = g_strdup(save_file);
 262         pfx[0] = '.'; /* restore capfile_name */
 263         *fsuffix = g_strdup(pfx);
 264     } else {
 265         /* Either there's no "." in the pathname, or it's in a directory
 266          * component, so the last component has no suffix. */
 267         *fprefix = g_strdup(save_file);
 268         *fsuffix = NULL;
 269     }
 270     g_free(save_file);
 271     return TRUE;
 272 }
 273
 274 /* Add a selection item, a simple parser for now */
 275 static gboolean
 276 add_selection(char *sel, guint* max_selection)
 277 {
 278     char *locn;
 279     char *next;
 280
 281     if (max_selected >= MAX_SELECTIONS) {
 282         /* Let the user know we stopped selecting */
 283         fprintf(stderr, "Out of room for packet selections.\n");
 284         return(FALSE);
 285     }
 286
 287     if (verbose)
 288         fprintf(stderr, "Add_Selected: %s\n", sel);
 289
 290     if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
 291         if (verbose)
 292             fprintf(stderr, "Not inclusive ...");
 293
 294         selectfrm[max_selected].inclusive = FALSE;
 295         selectfrm[max_selected].first = get_guint32(sel, "packet number");
 296         if (selectfrm[max_selected].first > *max_selection)
 297             *max_selection = selectfrm[max_selected].first;
 298
 299         if (verbose)
 300             fprintf(stderr, " %u\n", selectfrm[max_selected].first);
 301     } else {
 302         if (verbose)
 303             fprintf(stderr, "Inclusive ...");
 304
 305         next = locn + 1;
 306         selectfrm[max_selected].inclusive = TRUE;
 307         selectfrm[max_selected].first = get_guint32(sel, "beginning of packet range");
 308         selectfrm[max_selected].second = get_guint32(next, "end of packet range");
 309
 310         if (selectfrm[max_selected].second == 0)
 311         {
 312             /* Not a valid number, presume all */
 313             selectfrm[max_selected].second = *max_selection = G_MAXUINT;
 314         }
 315         else if (selectfrm[max_selected].second > *max_selection)
 316             *max_selection = selectfrm[max_selected].second;
 317
 318         if (verbose)
 319             fprintf(stderr, " %u, %u\n", selectfrm[max_selected].first,
 320                    selectfrm[max_selected].second);
 321     }
 322
 323     max_selected++;
 324     return(TRUE);
 325 }
 326
 327 /* Was the packet selected? */
 328
 329 static int
 330 selected(guint recno)
 331 {
 332     guint i;
 333
 334     for (i = 0; i < max_selected; i++) {
 335         if (selectfrm[i].inclusive) {
 336             if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
 337                 return 1;
 338         } else {
 339             if (recno == selectfrm[i].first)
 340                 return 1;
 341         }
 342     }
 343
 344   return 0;
 345 }
 346
 347 static gboolean
 348 set_time_adjustment(char *optarg_str_p)
 349 {
 350     char   *frac, *end;
 351     long    val;
 352     size_t  frac_digits;
 353
 354     if (!optarg_str_p)
 355         return TRUE;
 356
 357     /* skip leading whitespace */
 358     while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
 359         optarg_str_p++;
 360
 361     /* check for a negative adjustment */
 362     if (*optarg_str_p == '-') {
 363         time_adj.is_negative = 1;
 364         optarg_str_p++;
 365     }
 366
 367     /* collect whole number of seconds, if any */
 368     if (*optarg_str_p == '.') {         /* only fractional (i.e., .5 is ok) */
 369         val  = 0;
 370         frac = optarg_str_p;
 371     } else {
 372         val = strtol(optarg_str_p, &frac, 10);
 373         if (frac == NULL || frac == optarg_str_p
 374             || val == LONG_MIN || val == LONG_MAX) {
 375             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 376                     optarg_str_p);
 377             return FALSE;
 378         }
 379         if (val < 0) {            /* implies '--' since we caught '-' above  */
 380             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 381                     optarg_str_p);
 382             return FALSE;
 383         }
 384     }
 385     time_adj.tv.secs = val;
 386
 387     /* now collect the partial seconds, if any */
 388     if (*frac != '\0') {             /* chars left, so get fractional part */
 389         val = strtol(&(frac[1]), &end, 10);
 390         /* if more than 9 fractional digits truncate to 9 */
 391         if ((end - &(frac[1])) > 9) {
 392             frac[10] = 't'; /* 't' for truncate */
 393             val = strtol(&(frac[1]), &end, 10);
 394         }
 395         if (*frac != '.' || end == NULL || end == frac || val < 0
 396             || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
 397             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 398                     optarg_str_p);
 399             return FALSE;
 400         }
 401     } else {
 402         return TRUE;                     /* no fractional digits */
 403     }
 404
 405     /* adjust fractional portion from fractional to numerator
 406      * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
 407     frac_digits = end - frac - 1;   /* fractional digit count (remember '.') */
 408     while(frac_digits < 9) {    /* this is frac of 10^9 */
 409         val *= 10;
 410         frac_digits++;
 411     }
 412
 413     time_adj.tv.nsecs = (int)val;
 414     return TRUE;
 415 }
 416
 417 static gboolean
 418 set_strict_time_adj(char *optarg_str_p)
 419 {
 420     char   *frac, *end;
 421     long    val;
 422     size_t  frac_digits;
 423
 424     if (!optarg_str_p)
 425         return TRUE;
 426
 427     /* skip leading whitespace */
 428     while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
 429         optarg_str_p++;
 430
 431     /*
 432      * check for a negative adjustment
 433      * A negative strict adjustment value is a flag
 434      * to adjust all frames by the specifed delta time.
 435      */
 436     if (*optarg_str_p == '-') {
 437         strict_time_adj.is_negative = 1;
 438         optarg_str_p++;
 439     }
 440
 441     /* collect whole number of seconds, if any */
 442     if (*optarg_str_p == '.') {         /* only fractional (i.e., .5 is ok) */
 443         val  = 0;
 444         frac = optarg_str_p;
 445     } else {
 446         val = strtol(optarg_str_p, &frac, 10);
 447         if (frac == NULL || frac == optarg_str_p
 448             || val == LONG_MIN || val == LONG_MAX) {
 449             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 450                     optarg_str_p);
 451             return FALSE;
 452         }
 453         if (val < 0) {            /* implies '--' since we caught '-' above  */
 454             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 455                     optarg_str_p);
 456             return FALSE;
 457         }
 458     }
 459     strict_time_adj.tv.secs = val;
 460
 461     /* now collect the partial seconds, if any */
 462     if (*frac != '\0') {             /* chars left, so get fractional part */
 463         val = strtol(&(frac[1]), &end, 10);
 464         /* if more than 9 fractional digits truncate to 9 */
 465         if ((end - &(frac[1])) > 9) {
 466             frac[10] = 't'; /* 't' for truncate */
 467             val = strtol(&(frac[1]), &end, 10);
 468         }
 469         if (*frac != '.' || end == NULL || end == frac || val < 0
 470             || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
 471             fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
 472                     optarg_str_p);
 473             return FALSE;
 474         }
 475     } else {
 476         return TRUE;                     /* no fractional digits */
 477     }
 478
 479     /* adjust fractional portion from fractional to numerator
 480      * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
 481     frac_digits = end - frac - 1;   /* fractional digit count (remember '.') */
 482     while(frac_digits < 9) {    /* this is frac of 10^9 */
 483         val *= 10;
 484         frac_digits++;
 485     }
 486
 487     strict_time_adj.tv.nsecs = (int)val;
 488     return TRUE;
 489 }
 490
 491 static gboolean
 492 set_rel_time(char *optarg_str_p)
 493 {
 494     char   *frac, *end;
 495     long    val;
 496     size_t  frac_digits;
 497
 498     if (!optarg_str_p)
 499         return TRUE;
 500
 501     /* skip leading whitespace */
 502     while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
 503         optarg_str_p++;
 504
 505     /* ignore negative adjustment  */
 506     if (*optarg_str_p == '-')
 507         optarg_str_p++;
 508
 509     /* collect whole number of seconds, if any */
 510     if (*optarg_str_p == '.') {         /* only fractional (i.e., .5 is ok) */
 511         val  = 0;
 512         frac = optarg_str_p;
 513     } else {
 514         val = strtol(optarg_str_p, &frac, 10);
 515         if (frac == NULL || frac == optarg_str_p
 516             || val == LONG_MIN || val == LONG_MAX) {
 517             fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
 518                     optarg_str_p);
 519             return FALSE;
 520         }
 521         if (val < 0) {            /* implies '--' since we caught '-' above  */
 522             fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
 523                     optarg_str_p);
 524             return FALSE;
 525         }
 526     }
 527     relative_time_window.secs = val;
 528
 529     /* now collect the partial seconds, if any */
 530     if (*frac != '\0') {             /* chars left, so get fractional part */
 531         val = strtol(&(frac[1]), &end, 10);
 532         /* if more than 9 fractional digits truncate to 9 */
 533         if ((end - &(frac[1])) > 9) {
 534             frac[10] = 't'; /* 't' for truncate */
 535             val = strtol(&(frac[1]), &end, 10);
 536         }
 537         if (*frac != '.' || end == NULL || end == frac || val < 0
 538             || val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
 539             fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
 540                     optarg_str_p);
 541             return FALSE;
 542         }
 543     } else {
 544         return TRUE;                     /* no fractional digits */
 545     }
 546
 547     /* adjust fractional portion from fractional to numerator
 548      * e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
 549     frac_digits = end - frac - 1;   /* fractional digit count (remember '.') */
 550     while(frac_digits < 9) {    /* this is frac of 10^9 */
 551         val *= 10;
 552         frac_digits++;
 553     }
 554
 555     relative_time_window.nsecs = (int)val;
 556     return TRUE;
 557 }
 558
 559 #define LINUX_SLL_OFFSETP 14
 560 #define VLAN_SIZE 4
 561 static void
 562 sll_remove_vlan_info(guint8* fd, guint32* len) {
 563     if (pntoh16(fd + LINUX_SLL_OFFSETP) == ETHERTYPE_VLAN) {
 564         int rest_len;
 565         /* point to start of vlan */
 566         fd = fd + LINUX_SLL_OFFSETP;
 567         /* bytes to read after vlan info */
 568         rest_len = *len - (LINUX_SLL_OFFSETP + VLAN_SIZE);
 569         /* remove vlan info from packet */
 570         memmove(fd, fd + VLAN_SIZE, rest_len);
 571         *len -= 4;
 572     }
 573 }
 574
 575 static void
 576 remove_vlan_info(const struct wtap_pkthdr *phdr, guint8* fd, guint32* len) {
 577     switch (phdr->pkt_encap) {
 578         case WTAP_ENCAP_SLL:
 579             sll_remove_vlan_info(fd, len);
 580             break;
 581         default:
 582             /* no support for current pkt_encap */
 583             break;
 584     }
 585 }
 586
 587 static gboolean
 588 is_duplicate(guint8* fd, guint32 len) {
 589     int i;
 590
 591     /*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
 592     guint32 offset = ignored_bytes;
 593     guint32 new_len;
 594     guint8 *new_fd;
 595
 596     if (len <= ignored_bytes) {
 597         offset = 0;
 598     }
 599
 600     new_fd  = &fd[offset];
 601     new_len = len - (offset);
 602
 603     cur_dup_entry++;
 604     if (cur_dup_entry >= dup_window)
 605         cur_dup_entry = 0;
 606
 607     /* Calculate our digest */
 608     gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
 609
 610     fd_hash[cur_dup_entry].len = len;
 611
 612     /* Look for duplicates */
 613     for (i = 0; i < dup_window; i++) {
 614         if (i == cur_dup_entry)
 615             continue;
 616
 617         if (fd_hash[i].len == fd_hash[cur_dup_entry].len
 618             && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
 619             return TRUE;
 620         }
 621     }
 622
 623     return FALSE;
 624 }
 625
 626 static gboolean
 627 is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
 628     int i;
 629
 630     /*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
 631     guint32 offset = ignored_bytes;
 632     guint32 new_len;
 633     guint8 *new_fd;
 634
 635     if (len <= ignored_bytes) {
 636         offset = 0;
 637     }
 638
 639     new_fd  = &fd[offset];
 640     new_len = len - (offset);
 641
 642     cur_dup_entry++;
 643     if (cur_dup_entry >= dup_window)
 644         cur_dup_entry = 0;
 645
 646     /* Calculate our digest */
 647     gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
 648
 649     fd_hash[cur_dup_entry].len = len;
 650     fd_hash[cur_dup_entry].frame_time.secs = current->secs;
 651     fd_hash[cur_dup_entry].frame_time.nsecs = current->nsecs;
 652
 653     /*
 654      * Look for relative time related duplicates.
 655      * This is hopefully a reasonably efficient mechanism for
 656      * finding duplicates by rel time in the fd_hash[] cache.
 657      * We check starting from the most recently added hash
 658      * entries and work backwards towards older packets.
 659      * This approach allows the dup test to be terminated
 660      * when the relative time of a cached entry is found to
 661      * be beyond the dup time window.
 662      *
 663      * Of course this assumes that the input trace file is
 664      * "well-formed" in the sense that the packet timestamps are
 665      * in strict chronologically increasing order (which is NOT
 666      * always the case!!).
 667      *
 668      * The fd_hash[] table was deliberately created large (1,000,000).
 669      * Looking for time related duplicates in large trace files with
 670      * non-fractional dup time window values can potentially take
 671      * a long time to complete.
 672      */
 673
 674     for (i = cur_dup_entry - 1;; i--) {
 675         nstime_t delta;
 676         int cmp;
 677
 678         if (i < 0)
 679             i = dup_window - 1;
 680
 681         if (i == cur_dup_entry) {
 682             /*
 683              * We've decremented back to where we started.
 684              * Check no more!
 685              */
 686             break;
 687         }
 688
 689         if (nstime_is_unset(&(fd_hash[i].frame_time))) {
 690             /*
 691              * We've decremented to an unused fd_hash[] entry.
 692              * Check no more!
 693              */
 694             break;
 695         }
 696
 697         nstime_delta(&delta, current, &fd_hash[i].frame_time);
 698
 699         if (delta.secs < 0 || delta.nsecs < 0) {
 700             /*
 701              * A negative delta implies that the current packet
 702              * has an absolute timestamp less than the cached packet
 703              * that it is being compared to.  This is NOT a normal
 704              * situation since trace files usually have packets in
 705              * chronological order (oldest to newest).
 706              *
 707              * There are several possible ways to deal with this:
 708              * 1. 'continue' dup checking with the next cached frame.
 709              * 2. 'break' from looking for a duplicate of the current frame.
 710              * 3. Take the absolute value of the delta and see if that
 711              * falls within the specifed dup time window.
 712              *
 713              * Currently this code does option 1.  But it would pretty
 714              * easy to add yet-another-editcap-option to select one of
 715              * the other behaviors for dealing with out-of-sequence
 716              * packets.
 717              */
 718             continue;
 719         }
 720
 721         cmp = nstime_cmp(&delta, &relative_time_window);
 722
 723         if (cmp > 0) {
 724             /*
 725              * The delta time indicates that we are now looking at
 726              * cached packets beyond the specified dup time window.
 727              * Check no more!
 728              */
 729             break;
 730         } else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
 731                    && memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
 732             return TRUE;
 733         }
 734     }
 735
 736     return FALSE;
 737 }
 738
 739 static void
 740 print_usage(FILE *output)
 741 {
 742     fprintf(output, "\n");
 743     fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
 744     fprintf(output, "\n");
 745     fprintf(output, "<infile> and <outfile> must both be present.\n");
 746     fprintf(output, "A single packet or a range of packets can be selected.\n");
 747     fprintf(output, "\n");
 748     fprintf(output, "Packet selection:\n");
 749     fprintf(output, "  -r                     keep the selected packets; default is to delete them.\n");
 750     fprintf(output, "  -A <start time>        only output packets whose timestamp is after (or equal\n");
 751     fprintf(output, "                         to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
 752     fprintf(output, "  -B <stop time>         only output packets whose timestamp is before the\n");
 753     fprintf(output, "                         given time (format as YYYY-MM-DD hh:mm:ss).\n");
 754     fprintf(output, "\n");
 755     fprintf(output, "Duplicate packet removal:\n");
 756     fprintf(output, "  --novlan               remove vlan info from packets before checking for duplicates.\n");
 757     fprintf(output, "  -d                     remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
 758     fprintf(output, "  -D <dup window>        remove packet if duplicate; configurable <dup window>.\n");
 759     fprintf(output, "                         Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
 760     fprintf(output, "                         NOTE: A <dup window> of 0 with -v (verbose option) is\n");
 761     fprintf(output, "                         useful to print MD5 hashes.\n");
 762     fprintf(output, "  -w <dup time window>   remove packet if duplicate packet is found EQUAL TO OR\n");
 763     fprintf(output, "                         LESS THAN <dup time window> prior to current packet.\n");
 764     fprintf(output, "                         A <dup time window> is specified in relative seconds\n");
 765     fprintf(output, "                         (e.g. 0.000001).\n");
 766     fprintf(output, "  -a <framenum>:<comment> Add or replace comment for given frame number\n");
 767     fprintf(output, "\n");
 768     fprintf(output, "  -I <bytes to ignore>   ignore the specified number of bytes at the beginning\n");
 769     fprintf(output, "                         of the frame during MD5 hash calculation, unless the\n");
 770     fprintf(output, "                         frame is too short, then the full frame is used.\n");
 771     fprintf(output, "                         Useful to remove duplicated packets taken on\n");
 772     fprintf(output, "                         several routers (different mac addresses for\n");
 773     fprintf(output, "                         example).\n");
 774     fprintf(output, "                         e.g. -I 26 in case of Ether/IP will ignore\n");
 775     fprintf(output, "                         ether(14) and IP header(20 - 4(src ip) - 4(dst ip)).\n");
 776     fprintf(output, "\n");
 777     fprintf(output, "           NOTE: The use of the 'Duplicate packet removal' options with\n");
 778     fprintf(output, "           other editcap options except -v may not always work as expected.\n");
 779     fprintf(output, "           Specifically the -r, -t or -S options will very likely NOT have the\n");
 780     fprintf(output, "           desired effect if combined with the -d, -D or -w.\n");
 781     fprintf(output, "\n");
 782     fprintf(output, "Packet manipulation:\n");
 783     fprintf(output, "  -s <snaplen>           truncate each packet to max. <snaplen> bytes of data.\n");
 784     fprintf(output, "  -C [offset:]<choplen>  chop each packet by <choplen> bytes. Positive values\n");
 785     fprintf(output, "                         chop at the packet beginning, negative values at the\n");
 786     fprintf(output, "                         packet end. If an optional offset precedes the length,\n");
 787     fprintf(output, "                         then the bytes chopped will be offset from that value.\n");
 788     fprintf(output, "                         Positive offsets are from the packet beginning,\n");
 789     fprintf(output, "                         negative offsets are from the packet end. You can use\n");
 790     fprintf(output, "                         this option more than once, allowing up to 2 chopping\n");
 791     fprintf(output, "                         regions within a packet provided that at least 1\n");
 792     fprintf(output, "                         choplen is positive and at least 1 is negative.\n");
 793     fprintf(output, "  -L                     adjust the frame (i.e. reported) length when chopping\n");
 794     fprintf(output, "                         and/or snapping.\n");
 795     fprintf(output, "  -t <time adjustment>   adjust the timestamp of each packet.\n");
 796     fprintf(output, "                         <time adjustment> is in relative seconds (e.g. -0.5).\n");
 797     fprintf(output, "  -S <strict adjustment> adjust timestamp of packets if necessary to ensure\n");
 798     fprintf(output, "                         strict chronological increasing order. The <strict\n");
 799     fprintf(output, "                         adjustment> is specified in relative seconds with\n");
 800     fprintf(output, "                         values of 0 or 0.000001 being the most reasonable.\n");
 801     fprintf(output, "                         A negative adjustment value will modify timestamps so\n");
 802     fprintf(output, "                         that each packet's delta time is the absolute value\n");
 803     fprintf(output, "                         of the adjustment specified. A value of -0 will set\n");
 804     fprintf(output, "                         all packets to the timestamp of the first packet.\n");
 805     fprintf(output, "  -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
 806     fprintf(output, "                         a particular packet byte will be randomly changed.\n");
 807     fprintf(output, "  -o <change offset>     When used in conjunction with -E, skip some bytes from the\n");
 808     fprintf(output, "                         beginning of the packet. This allows one to preserve some\n");
 809     fprintf(output, "                         bytes, in order to have some headers untouched.\n");
 810     fprintf(output, "\n");
 811     fprintf(output, "Output File(s):\n");
 812     fprintf(output, "  -c <packets per file>  split the packet output to different files based on\n");
 813     fprintf(output, "                         uniform packet counts with a maximum of\n");
 814     fprintf(output, "                         <packets per file> each.\n");
 815     fprintf(output, "  -i <seconds per file>  split the packet output to different files based on\n");
 816     fprintf(output, "                         uniform time intervals with a maximum of\n");
 817     fprintf(output, "                         <seconds per file> each.\n");
 818     fprintf(output, "  -F <capture type>      set the output file type; default is pcapng. An empty\n");
 819     fprintf(output, "                         \"-F\" option will list the file types.\n");
 820     fprintf(output, "  -T <encap type>        set the output file encapsulation type; default is the\n");
 821     fprintf(output, "                         same as the input file. An empty \"-T\" option will\n");
 822     fprintf(output, "                         list the encapsulation types.\n");
 823     fprintf(output, "\n");
 824     fprintf(output, "Miscellaneous:\n");
 825     fprintf(output, "  -h                     display this help and exit.\n");
 826     fprintf(output, "  -v                     verbose output.\n");
 827     fprintf(output, "                         If -v is used with any of the 'Duplicate Packet\n");
 828     fprintf(output, "                         Removal' options (-d, -D or -w) then Packet lengths\n");
 829     fprintf(output, "                         and MD5 hashes are printed to standard-error.\n");
 830     fprintf(output, "\n");
 831 }
 832
 833 struct string_elem {
 834     const char *sstr;   /* The short string */
 835     const char *lstr;   /* The long string */
 836 };
 837
 838 static gint
 839 string_compare(gconstpointer a, gconstpointer b)
 840 {
 841     return strcmp(((const struct string_elem *)a)->sstr,
 842         ((const struct string_elem *)b)->sstr);
 843 }
 844
 845 static gint
 846 string_nat_compare(gconstpointer a, gconstpointer b)
 847 {
 848     return ws_ascii_strnatcmp(((const struct string_elem *)a)->sstr,
 849         ((const struct string_elem *)b)->sstr);
 850 }
 851
 852 static void
 853 string_elem_print(gpointer data, gpointer not_used _U_)
 854 {
 855     fprintf(stderr, "    %s - %s\n",
 856         ((struct string_elem *)data)->sstr,
 857         ((struct string_elem *)data)->lstr);
 858 }
 859
 860 static void
 861 list_capture_types(void) {
 862     int i;
 863     struct string_elem *captypes;
 864     GSList *list = NULL;
 865
 866     captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES_SUBTYPES);
 867     fprintf(stderr, "editcap: The available capture file types for the \"-F\" flag are:\n");
 868     for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
 869         if (wtap_dump_can_open(i)) {
 870             captypes[i].sstr = wtap_file_type_subtype_short_string(i);
 871             captypes[i].lstr = wtap_file_type_subtype_string(i);
 872             list = g_slist_insert_sorted(list, &captypes[i], string_compare);
 873         }
 874     }
 875     g_slist_foreach(list, string_elem_print, NULL);
 876     g_slist_free(list);
 877     g_free(captypes);
 878 }
 879
 880 static void
 881 list_encap_types(void) {
 882     int i;
 883     struct string_elem *encaps;
 884     GSList *list = NULL;
 885
 886     encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
 887     fprintf(stderr, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
 888     for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
 889         encaps[i].sstr = wtap_encap_short_string(i);
 890         if (encaps[i].sstr != NULL) {
 891             encaps[i].lstr = wtap_encap_string(i);
 892             list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
 893         }
 894     }
 895     g_slist_foreach(list, string_elem_print, NULL);
 896     g_slist_free(list);
 897     g_free(encaps);
 898 }
 899
 900 static int
 901 framenum_compare(gconstpointer a, gconstpointer b, gpointer user_data _U_)
 902 {
 903     if (GPOINTER_TO_UINT(a) < GPOINTER_TO_UINT(b))
 904         return -1;
 905
 906     if (GPOINTER_TO_UINT(a) > GPOINTER_TO_UINT(b))
 907         return 1;
 908
 909     return 0;
 910 }
 911
 912 /*
 913  * General errors are reported with an console message in editcap.
 914  */
 915 static void
 916 failure_message(const char *msg_format, va_list ap)
 917 {
 918   fprintf(stderr, "editcap: ");
 919   vfprintf(stderr, msg_format, ap);
 920   fprintf(stderr, "\n");
 921 }
 922
 923 /*
 924  * Report additional information for an error in command-line arguments.
 925  */
 926 static void
 927 failure_message_cont(const char *msg_format, va_list ap)
 928 {
 929     vfprintf(stderr, msg_format, ap);
 930     fprintf(stderr, "\n");
 931 }
 932
 933 static wtap_dumper *
 934 editcap_dump_open(const char *filename, guint32 snaplen,
 935                   GArray* shb_hdrs,
 936                   wtapng_iface_descriptions_t *idb_inf,
 937                   GArray* nrb_hdrs, int *write_err)
 938 {
 939   wtap_dumper *pdh;
 940
 941   if (strcmp(filename, "-") == 0) {
 942     /* Write to the standard output. */
 943     pdh = wtap_dump_open_stdout_ng(out_file_type_subtype, out_frame_type,
 944                                    snaplen, FALSE /* compressed */,
 945                                    shb_hdrs, idb_inf, nrb_hdrs, write_err);
 946   } else {
 947     pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
 948                             snaplen, FALSE /* compressed */,
 949                             shb_hdrs, idb_inf, nrb_hdrs, write_err);
 950   }
 951   return pdh;
 952 }
 953
 954 int
 955 main(int argc, char *argv[])
 956 {
 957     GString      *comp_info_str;
 958     GString      *runtime_info_str;
 959     char         *init_progfile_dir_error;
 960     wtap         *wth = NULL;
 961     int           i, j, read_err, write_err;
 962     gchar        *read_err_info, *write_err_info;
 963     int           opt;
 964     static const struct option long_options[] = {
 965         {"novlan", no_argument, NULL, 0x8100},
 966         {"help", no_argument, NULL, 'h'},
 967         {"version", no_argument, NULL, 'V'},
 968         {0, 0, 0, 0 }
 969     };
 970
 971     char         *p;
 972     guint32       snaplen            = 0; /* No limit               */
 973     chop_t        chop               = {0, 0, 0, 0, 0, 0}; /* No chop */
 974     gboolean      adjlen             = FALSE;
 975     wtap_dumper  *pdh                = NULL;
 976     unsigned int  count              = 1;
 977     unsigned int  duplicate_count    = 0;
 978     gint64        data_offset;
 979     int           err_type;
 980     guint8       *buf;
 981     guint32       read_count         = 0;
 982     guint32       split_packet_count = 0;
 983     int           written_count      = 0;
 984     char         *filename           = NULL;
 985     gboolean      ts_okay;
 986     guint32       secs_per_block     = 0;
 987     int           block_cnt          = 0;
 988     nstime_t      block_start;
 989     gchar        *fprefix            = NULL;
 990     gchar        *fsuffix            = NULL;
 991     guint32       change_offset      = 0;
 992     guint         max_packet_number  = 0;
 993     const struct wtap_pkthdr    *phdr;
 994     struct wtap_pkthdr           temp_phdr;
 995     wtapng_iface_descriptions_t *idb_inf = NULL;
 996     GArray                      *shb_hdrs = NULL;
 997     GArray                      *nrb_hdrs = NULL;
 998     char                        *shb_user_appl;
 999     int                          ret = EXIT_SUCCESS;
1000
1001     cmdarg_err_init(failure_message, failure_message_cont);
1002
1003 #ifdef _WIN32
1004     arg_list_utf_16to8(argc, argv);
1005     create_app_running_mutex();
1006 #endif /* _WIN32 */
1007
1008     /* Get the compile-time version information string */
1009     comp_info_str = get_compiled_version_info(NULL, NULL);
1010
1011     /* Get the run-time version information string */
1012     runtime_info_str = get_runtime_version_info(NULL);
1013
1014     /* Add it to the information to be reported on a crash. */
1015     ws_add_crash_info("Editcap (Wireshark) %s\n"
1016          "\n"
1017          "%s"
1018          "\n"
1019          "%s",
1020       get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);
1021     g_string_free(comp_info_str, TRUE);
1022     g_string_free(runtime_info_str, TRUE);
1023
1024     /*
1025      * Get credential information for later use.
1026      */
1027     init_process_policies();
1028
1029     /*
1030      * Attempt to get the pathname of the directory containing the
1031      * executable file.
1032      */
1033     init_progfile_dir_error = init_progfile_dir(argv[0], main);
1034     if (init_progfile_dir_error != NULL) {
1035         fprintf(stderr,
1036                 "editcap: Can't get pathname of directory containing the editcap program: %s.\n",
1037                 init_progfile_dir_error);
1038         g_free(init_progfile_dir_error);
1039     }
1040
1041     wtap_init();
1042
1043 #ifdef HAVE_PLUGINS
1044     /* Register wiretap plugins */
1045     init_report_err(failure_message,NULL,NULL,NULL);
1046
1047     /* Scan for plugins.  This does *not* call their registration routines;
1048        that's done later.
1049
1050        Don't report failures to load plugins because most (non-wiretap)
1051        plugins *should* fail to load (because we're not linked against
1052        libwireshark and dissector plugins need libwireshark). */
1053     scan_plugins(DONT_REPORT_LOAD_FAILURE);
1054
1055     /* Register all libwiretap plugin modules. */
1056     register_all_wiretap_modules();
1057 #endif
1058
1059     /* Process the options */
1060     while ((opt = getopt_long(argc, argv, "a:A:B:c:C:dD:E:F:hi:I:Lo:rs:S:t:T:vVw:", long_options, NULL)) != -1) {
1061         switch (opt) {
1062         case 0x8100:
1063         {
1064             rem_vlan = TRUE;
1065             break;
1066         }
1067
1068         case 'a':
1069         {
1070             guint frame_number;
1071             gint string_start_index = 0;
1072
1073             if ((sscanf(optarg, "%u:%n", &frame_number, &string_start_index) < 1) || (string_start_index == 0)) {
1074                 fprintf(stderr, "editcap: \"%s\" isn't a valid <frame>:<comment>\n\n",
1075                         optarg);
1076                 ret = INVALID_OPTION;
1077                 goto clean_exit;
1078             }
1079
1080             /* Lazily create the table */
1081             if (!frames_user_comments) {
1082                 frames_user_comments = g_tree_new_full(framenum_compare, NULL, NULL, g_free);
1083             }
1084
1085             /* Insert this entry (framenum -> comment) */
1086             g_tree_replace(frames_user_comments, GUINT_TO_POINTER(frame_number), g_strdup(optarg+string_start_index));
1087             break;
1088         }
1089
1090         case 'A':
1091         {
1092             struct tm starttm;
1093
1094             memset(&starttm,0,sizeof(struct tm));
1095
1096             if (!strptime(optarg,"%Y-%m-%d %T", &starttm)) {
1097                 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
1098                         optarg);
1099                 ret = INVALID_OPTION;
1100                 goto clean_exit;
1101             }
1102
1103             check_startstop = TRUE;
1104             starttm.tm_isdst = -1;
1105
1106             starttime = mktime(&starttm);
1107             break;
1108         }
1109
1110         case 'B':
1111         {
1112             struct tm stoptm;
1113
1114             memset(&stoptm,0,sizeof(struct tm));
1115
1116             if (!strptime(optarg,"%Y-%m-%d %T", &stoptm)) {
1117                 fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
1118                         optarg);
1119                 ret = INVALID_OPTION;
1120                 goto clean_exit;
1121             }
1122             check_startstop = TRUE;
1123             stoptm.tm_isdst = -1;
1124             stoptime = mktime(&stoptm);
1125             break;
1126         }
1127
1128         case 'c':
1129             split_packet_count = get_nonzero_guint32(optarg, "packet count");
1130             break;
1131
1132         case 'C':
1133         {
1134             int choplen = 0, chopoff = 0;
1135
1136             switch (sscanf(optarg, "%d:%d", &chopoff, &choplen)) {
1137             case 1: /* only the chop length was specififed */
1138                 choplen = chopoff;
1139                 chopoff = 0;
1140                 break;
1141
1142             case 2: /* both an offset and chop length was specified */
1143                 break;
1144
1145             default:
1146                 fprintf(stderr, "editcap: \"%s\" isn't a valid chop length or offset:length\n",
1147                         optarg);
1148                 ret = INVALID_OPTION;
1149                 goto clean_exit;
1150                 break;
1151             }
1152
1153             if (choplen > 0) {
1154                 chop.len_begin += choplen;
1155                 if (chopoff > 0)
1156                     chop.off_begin_pos += chopoff;
1157                 else
1158                     chop.off_begin_neg += chopoff;
1159             } else if (choplen < 0) {
1160                 chop.len_end += choplen;
1161                 if (chopoff > 0)
1162                     chop.off_end_pos += chopoff;
1163                 else
1164                     chop.off_end_neg += chopoff;
1165             }
1166             break;
1167         }
1168
1169         case 'd':
1170             dup_detect = TRUE;
1171             dup_detect_by_time = FALSE;
1172             dup_window = DEFAULT_DUP_DEPTH;
1173             break;
1174
1175         case 'D':
1176             dup_detect = TRUE;
1177             dup_detect_by_time = FALSE;
1178             dup_window = get_guint32(optarg, "duplicate window");
1179             if (dup_window > MAX_DUP_DEPTH) {
1180                 fprintf(stderr, "editcap: \"%d\" duplicate window value must be between 0 and %d inclusive.\n",
1181                         dup_window, MAX_DUP_DEPTH);
1182                 ret = INVALID_OPTION;
1183                 goto clean_exit;
1184             }
1185             break;
1186
1187         case 'E':
1188             err_prob = g_ascii_strtod(optarg, &p);
1189             if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
1190                 fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
1191                         optarg);
1192                 ret = INVALID_OPTION;
1193                 goto clean_exit;
1194             }
1195             srand( (unsigned int) (time(NULL) + ws_getpid()) );
1196             break;
1197
1198         case 'F':
1199             out_file_type_subtype = wtap_short_string_to_file_type_subtype(optarg);
1200             if (out_file_type_subtype < 0) {
1201                 fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
1202                         optarg);
1203                 list_capture_types();
1204                 ret = INVALID_OPTION;
1205                 goto clean_exit;
1206             }
1207             break;
1208
1209         case 'h':
1210             printf("Editcap (Wireshark) %s\n"
1211                    "Edit and/or translate the format of capture files.\n"
1212                    "See https://www.wireshark.org for more information.\n",
1213                get_ws_vcs_version_info());
1214             print_usage(stdout);
1215             goto clean_exit;
1216             break;
1217
1218         case 'i': /* break capture file based on time interval */
1219             secs_per_block = get_nonzero_guint32(optarg, "time interval");
1220             break;
1221
1222         case 'I': /* ignored_bytes at the beginning of the frame for duplications removal */
1223             ignored_bytes = get_guint32(optarg, "number of bytes to ignore");
1224             break;
1225
1226         case 'L':
1227             adjlen = TRUE;
1228             break;
1229
1230         case 'o':
1231             change_offset = get_guint32(optarg, "change offset");
1232             break;
1233
1234         case 'r':
1235             keep_em = !keep_em;  /* Just invert */
1236             break;
1237
1238         case 's':
1239             snaplen = get_nonzero_guint32(optarg, "snapshot length");
1240             break;
1241
1242         case 'S':
1243             if (!set_strict_time_adj(optarg)) {
1244                 ret = INVALID_OPTION;
1245                 goto clean_exit;
1246             }
1247             do_strict_time_adjustment = TRUE;
1248             break;
1249
1250         case 't':
1251             if (!set_time_adjustment(optarg)) {
1252                 ret = INVALID_OPTION;
1253                 goto clean_exit;
1254             }
1255             break;
1256
1257         case 'T':
1258             out_frame_type = wtap_short_string_to_encap(optarg);
1259             if (out_frame_type < 0) {
1260                 fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
1261                         optarg);
1262                 list_encap_types();
1263                 ret = INVALID_OPTION;
1264                 goto clean_exit;
1265             }
1266             break;
1267
1268         case 'v':
1269             verbose = !verbose;  /* Just invert */
1270             break;
1271
1272         case 'V':
1273             comp_info_str = get_compiled_version_info(NULL, NULL);
1274             runtime_info_str = get_runtime_version_info(NULL);
1275             show_version("Editcap (Wireshark)", comp_info_str, runtime_info_str);
1276             g_string_free(comp_info_str, TRUE);
1277             g_string_free(runtime_info_str, TRUE);
1278             goto clean_exit;
1279             break;
1280
1281         case 'w':
1282             dup_detect = FALSE;
1283             dup_detect_by_time = TRUE;
1284             dup_window = MAX_DUP_DEPTH;
1285             if (!set_rel_time(optarg)) {
1286                 ret = INVALID_OPTION;
1287                 goto clean_exit;
1288             }
1289             break;
1290
1291         case '?':              /* Bad options if GNU getopt */
1292             switch(optopt) {
1293             case'F':
1294                 list_capture_types();
1295                 break;
1296             case'T':
1297                 list_encap_types();
1298                 break;
1299             default:
1300                 print_usage(stderr);
1301                 break;
1302             }
1303             ret = INVALID_OPTION;
1304             goto clean_exit;
1305             break;
1306         }
1307     } /* processing commmand-line options */
1308
1309 #ifdef DEBUG
1310     fprintf(stderr, "Optind = %i, argc = %i\n", optind, argc);
1311 #endif
1312
1313     if ((argc - optind) < 1) {
1314         print_usage(stderr);
1315         ret = INVALID_OPTION;
1316         goto clean_exit;
1317     }
1318
1319     if (check_startstop && !stoptime) {
1320         struct tm stoptm;
1321
1322         /* XXX: will work until 2035 */
1323         memset(&stoptm,0,sizeof(struct tm));
1324         stoptm.tm_year = 135;
1325         stoptm.tm_mday = 31;
1326         stoptm.tm_mon = 11;
1327
1328         stoptime = mktime(&stoptm);
1329     }
1330
1331     nstime_set_unset(&block_start);
1332
1333     if (starttime > stoptime) {
1334         fprintf(stderr, "editcap: start time is after the stop time\n");
1335         ret = INVALID_OPTION;
1336         goto clean_exit;
1337     }
1338
1339     if (split_packet_count != 0 && secs_per_block != 0) {
1340         fprintf(stderr, "editcap: can't split on both packet count and time interval\n");
1341         fprintf(stderr, "editcap: at the same time\n");
1342         ret = INVALID_OPTION;
1343         goto clean_exit;
1344     }
1345
1346     wth = wtap_open_offline(argv[optind], WTAP_TYPE_AUTO, &read_err, &read_err_info, FALSE);
1347
1348     if (!wth) {
1349         fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
1350                 wtap_strerror(read_err));
1351         if (read_err_info != NULL) {
1352             fprintf(stderr, "(%s)\n", read_err_info);
1353             g_free(read_err_info);
1354         }
1355         ret = INVALID_FILE;
1356         goto clean_exit;
1357     }
1358
1359     if (verbose) {
1360         fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
1361                 wtap_file_type_subtype_string(wtap_file_type_subtype(wth)));
1362     }
1363
1364     shb_hdrs = wtap_file_get_shb_for_new_file(wth);
1365     idb_inf = wtap_file_get_idb_info(wth);
1366     nrb_hdrs = wtap_file_get_nrb_for_new_file(wth);
1367
1368     /*
1369      * Now, process the rest, if any ... we only write if there is an extra
1370      * argument or so ...
1371      */
1372
1373     if ((argc - optind) >= 2) {
1374         if (out_frame_type == -2)
1375             out_frame_type = wtap_file_encap(wth);
1376
1377         for (i = optind + 2; i < argc; i++)
1378             if (add_selection(argv[i], &max_packet_number) == FALSE)
1379                 break;
1380
1381         if (keep_em == FALSE)
1382             max_packet_number = G_MAXUINT;
1383
1384         if (dup_detect || dup_detect_by_time) {
1385             for (i = 0; i < dup_window; i++) {
1386                 memset(&fd_hash[i].digest, 0, 16);
1387                 fd_hash[i].len = 0;
1388                 nstime_set_unset(&fd_hash[i].frame_time);
1389             }
1390         }
1391
1392         /* Read all of the packets in turn */
1393         while (wtap_read(wth, &read_err, &read_err_info, &data_offset)) {
1394             if (max_packet_number <= read_count)
1395                 break;
1396
1397             read_count++;
1398
1399             phdr = wtap_phdr(wth);
1400
1401             /* Extra actions for the first packet */
1402             if (read_count == 1) {
1403                 if (split_packet_count != 0 || secs_per_block != 0) {
1404                     if (!fileset_extract_prefix_suffix(argv[optind+1], &fprefix, &fsuffix)) {
1405                         ret = CANT_EXTRACT_PREFIX;
1406                         goto clean_exit;
1407                     }
1408
1409                     filename = fileset_get_filename_by_pattern(block_cnt++, phdr, fprefix, fsuffix);
1410                 } else {
1411                     filename = g_strdup(argv[optind+1]);
1412                 }
1413                 g_assert(filename);
1414
1415                 /* If we don't have an application name add Editcap */
1416                 if (wtap_block_get_string_option_value(g_array_index(shb_hdrs, wtap_block_t, 0), OPT_SHB_USERAPPL, &shb_user_appl) != WTAP_OPTTYPE_SUCCESS) {
1417                     wtap_block_add_string_option_format(g_array_index(shb_hdrs, wtap_block_t, 0), OPT_SHB_USERAPPL, "Editcap " VERSION);
1418                 }
1419
1420                 pdh = editcap_dump_open(filename,
1421                                         snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1422                                         shb_hdrs, idb_inf, nrb_hdrs, &write_err);
1423
1424                 if (pdh == NULL) {
1425                     fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1426                             filename, wtap_strerror(write_err));
1427                     ret = INVALID_FILE;
1428                     goto clean_exit;
1429                 }
1430             } /* first packet only handling */
1431
1432
1433             buf = wtap_buf_ptr(wth);
1434
1435             /*
1436              * Not all packets have time stamps. Only process the time
1437              * stamp if we have one.
1438              */
1439             if (phdr->presence_flags & WTAP_HAS_TS) {
1440                 if (nstime_is_unset(&block_start)) {
1441                     block_start = phdr->ts;
1442                 }
1443                 if (secs_per_block != 0) {
1444                     while (((guint32)(phdr->ts.secs - block_start.secs) >  secs_per_block)
1445                            || ((guint32)(phdr->ts.secs - block_start.secs) == secs_per_block
1446                                && phdr->ts.nsecs >= block_start.nsecs )) { /* time for the next file */
1447
1448                         if (!wtap_dump_close(pdh, &write_err)) {
1449                             fprintf(stderr, "editcap: Error writing to %s: %s\n",
1450                                     filename, wtap_strerror(write_err));
1451                             ret = WRITE_ERROR;
1452                             goto clean_exit;
1453                         }
1454                         block_start.secs = block_start.secs +  secs_per_block; /* reset for next interval */
1455                         g_free(filename);
1456                         filename = fileset_get_filename_by_pattern(block_cnt++, phdr, fprefix, fsuffix);
1457                         g_assert(filename);
1458
1459                         if (verbose)
1460                             fprintf(stderr, "Continuing writing in file %s\n", filename);
1461
1462                         pdh = editcap_dump_open(filename,
1463                                                 snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1464                                                 shb_hdrs, idb_inf, nrb_hdrs, &write_err);
1465
1466                         if (pdh == NULL) {
1467                             fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1468                                     filename, wtap_strerror(write_err));
1469                             ret = INVALID_FILE;
1470                             goto clean_exit;
1471                         }
1472                     }
1473                 }
1474             }  /* time stamp handling */
1475
1476             if (split_packet_count != 0) {
1477                 /* time for the next file? */
1478                 if (written_count > 0 && (written_count % split_packet_count) == 0) {
1479                     if (!wtap_dump_close(pdh, &write_err)) {
1480                         fprintf(stderr, "editcap: Error writing to %s: %s\n",
1481                                 filename, wtap_strerror(write_err));
1482                         ret = WRITE_ERROR;
1483                         goto clean_exit;
1484                     }
1485
1486                     g_free(filename);
1487                     filename = fileset_get_filename_by_pattern(block_cnt++, phdr, fprefix, fsuffix);
1488                     g_assert(filename);
1489
1490                     if (verbose)
1491                         fprintf(stderr, "Continuing writing in file %s\n", filename);
1492
1493                     pdh = editcap_dump_open(filename,
1494                                             snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
1495                                             shb_hdrs, idb_inf, nrb_hdrs, &write_err);
1496                     if (pdh == NULL) {
1497                         fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1498                                 filename, wtap_strerror(write_err));
1499                         ret = INVALID_FILE;
1500                         goto clean_exit;
1501                     }
1502                 }
1503             } /* split packet handling */
1504
1505             if (check_startstop) {
1506                 /*
1507                  * Is the packet in the selected timeframe?
1508                  * If the packet has no time stamp, the answer is "no".
1509                  */
1510                 if (phdr->presence_flags & WTAP_HAS_TS)
1511                     ts_okay = (phdr->ts.secs >= starttime) && (phdr->ts.secs < stoptime);
1512                 else
1513                     ts_okay = FALSE;
1514             } else {
1515                 /*
1516                  * No selected timeframe, so all packets are "in the
1517                  * selected timeframe".
1518                  */
1519                 ts_okay = TRUE;
1520             }
1521
1522             if (ts_okay && ((!selected(count) && !keep_em)
1523                             || (selected(count) && keep_em))) {
1524
1525                 if (verbose && !dup_detect && !dup_detect_by_time)
1526                     fprintf(stderr, "Packet: %u\n", count);
1527
1528                 /* We simply write it, perhaps after truncating it; we could
1529                  * do other things, like modify it. */
1530
1531                 phdr = wtap_phdr(wth);
1532
1533                 if (snaplen != 0) {
1534                     /* Limit capture length to snaplen */
1535                     if (phdr->caplen > snaplen) {
1536                         /* Copy and change rather than modify returned phdr */
1537                         temp_phdr = *phdr;
1538                         temp_phdr.caplen = snaplen;
1539                         phdr = &temp_phdr;
1540                     }
1541                     /* If -L, also set reported length to snaplen */
1542                     if (adjlen && phdr->len > snaplen) {
1543                         /* Copy and change rather than modify returned phdr */
1544                         temp_phdr = *phdr;
1545                         temp_phdr.len = snaplen;
1546                         phdr = &temp_phdr;
1547                     }
1548                 }
1549
1550                 /* CHOP */
1551                 temp_phdr = *phdr;
1552                 handle_chopping(chop, &temp_phdr, phdr, &buf, adjlen);
1553                 phdr = &temp_phdr;
1554
1555                 if (phdr->presence_flags & WTAP_HAS_TS) {
1556                     /* Do we adjust timestamps to ensure strict chronological
1557                      * order? */
1558                     if (do_strict_time_adjustment) {
1559                         if (previous_time.secs || previous_time.nsecs) {
1560                             if (!strict_time_adj.is_negative) {
1561                                 nstime_t current;
1562                                 nstime_t delta;
1563
1564                                 current = phdr->ts;
1565
1566                                 nstime_delta(&delta, &current, &previous_time);
1567
1568                                 if (delta.secs < 0 || delta.nsecs < 0) {
1569                                     /*
1570                                      * A negative delta indicates that the current packet
1571                                      * has an absolute timestamp less than the previous packet
1572                                      * that it is being compared to.  This is NOT a normal
1573                                      * situation since trace files usually have packets in
1574                                      * chronological order (oldest to newest).
1575                                      */
1576                                     /* fprintf(stderr, "++out of order, need to adjust this packet!\n"); */
1577                                     temp_phdr = *phdr;
1578                                     temp_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.secs;
1579                                     temp_phdr.ts.nsecs = previous_time.nsecs;
1580                                     if (temp_phdr.ts.nsecs + strict_time_adj.tv.nsecs > ONE_BILLION) {
1581                                         /* carry */
1582                                         temp_phdr.ts.secs++;
1583                                         temp_phdr.ts.nsecs += strict_time_adj.tv.nsecs - ONE_BILLION;
1584                                     } else {
1585                                         temp_phdr.ts.nsecs += strict_time_adj.tv.nsecs;
1586                                     }
1587                                     phdr = &temp_phdr;
1588                                 }
1589                             } else {
1590                                 /*
1591                                  * A negative strict time adjustment is requested.
1592                                  * Unconditionally set each timestamp to previous
1593                                  * packet's timestamp plus delta.
1594                                  */
1595                                 temp_phdr = *phdr;
1596                                 temp_phdr.ts.secs = previous_time.secs + strict_time_adj.tv.secs;
1597                                 temp_phdr.ts.nsecs = previous_time.nsecs;
1598                                 if (temp_phdr.ts.nsecs + strict_time_adj.tv.nsecs > ONE_BILLION) {
1599                                     /* carry */
1600                                     temp_phdr.ts.secs++;
1601                                     temp_phdr.ts.nsecs += strict_time_adj.tv.nsecs - ONE_BILLION;
1602                                 } else {
1603                                     temp_phdr.ts.nsecs += strict_time_adj.tv.nsecs;
1604                                 }
1605                                 phdr = &temp_phdr;
1606                             }
1607                         }
1608                         previous_time = phdr->ts;
1609                     }
1610
1611                     if (time_adj.tv.secs != 0) {
1612                         temp_phdr = *phdr;
1613                         if (time_adj.is_negative)
1614                             temp_phdr.ts.secs -= time_adj.tv.secs;
1615                         else
1616                             temp_phdr.ts.secs += time_adj.tv.secs;
1617                         phdr = &temp_phdr;
1618                     }
1619
1620                     if (time_adj.tv.nsecs != 0) {
1621                         temp_phdr = *phdr;
1622                         if (time_adj.is_negative) { /* subtract */
1623                             if (temp_phdr.ts.nsecs < time_adj.tv.nsecs) { /* borrow */
1624                                 temp_phdr.ts.secs--;
1625                                 temp_phdr.ts.nsecs += ONE_BILLION;
1626                             }
1627                             temp_phdr.ts.nsecs -= time_adj.tv.nsecs;
1628                         } else {                  /* add */
1629                             if (temp_phdr.ts.nsecs + time_adj.tv.nsecs > ONE_BILLION) {
1630                                 /* carry */
1631                                 temp_phdr.ts.secs++;
1632                                 temp_phdr.ts.nsecs += time_adj.tv.nsecs - ONE_BILLION;
1633                             } else {
1634                                 temp_phdr.ts.nsecs += time_adj.tv.nsecs;
1635                             }
1636                         }
1637                         phdr = &temp_phdr;
1638                     }
1639                 } /* time stamp adjustment */
1640
1641                 /* remove vlan info */
1642                 if (rem_vlan) {
1643                     /* TODO: keep casting const like this? change pointer instead of value? */
1644                     remove_vlan_info(phdr, buf, (guint32 *) &phdr->caplen);
1645                 }
1646
1647                 /* suppress duplicates by packet window */
1648                 if (dup_detect) {
1649                     if (is_duplicate(buf, phdr->caplen)) {
1650                         if (verbose) {
1651                             fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
1652                                     count, phdr->caplen);
1653                             for (i = 0; i < 16; i++)
1654                                 fprintf(stderr, "%02x",
1655                                         (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1656                             fprintf(stderr, "\n");
1657                         }
1658                         duplicate_count++;
1659                         count++;
1660                         continue;
1661                     } else {
1662                         if (verbose) {
1663                             fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
1664                                     count, phdr->caplen);
1665                             for (i = 0; i < 16; i++)
1666                                 fprintf(stderr, "%02x",
1667                                         (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1668                             fprintf(stderr, "\n");
1669                         }
1670                     }
1671                 } /* suppression of duplicates */
1672
1673                 if (phdr->presence_flags & WTAP_HAS_TS) {
1674                     /* suppress duplicates by time window */
1675                     if (dup_detect_by_time) {
1676                         nstime_t current;
1677
1678                         current.secs  = phdr->ts.secs;
1679                         current.nsecs = phdr->ts.nsecs;
1680
1681                         if (is_duplicate_rel_time(buf, phdr->caplen, &current)) {
1682                             if (verbose) {
1683                                 fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
1684                                         count, phdr->caplen);
1685                                 for (i = 0; i < 16; i++)
1686                                     fprintf(stderr, "%02x",
1687                                             (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1688                                 fprintf(stderr, "\n");
1689                             }
1690                             duplicate_count++;
1691                             count++;
1692                             continue;
1693                         } else {
1694                             if (verbose) {
1695                                 fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
1696                                         count, phdr->caplen);
1697                                 for (i = 0; i < 16; i++)
1698                                     fprintf(stderr, "%02x",
1699                                             (unsigned char)fd_hash[cur_dup_entry].digest[i]);
1700                                 fprintf(stderr, "\n");
1701                             }
1702                         }
1703                     }
1704                 } /* suppress duplicates by time window */
1705
1706                 if (change_offset > phdr->caplen) {
1707                     fprintf(stderr, "change offset %u is longer than caplen %u in packet %u\n",
1708                         change_offset, phdr->caplen, count);
1709                 }
1710
1711                 /* Random error mutation */
1712                 if (err_prob > 0.0 && change_offset <= phdr->caplen) {
1713                     int real_data_start = 0;
1714
1715                     /* Protect non-protocol data */
1716                     if (wtap_file_type_subtype(wth) == WTAP_FILE_TYPE_SUBTYPE_CATAPULT_DCT2000)
1717                         real_data_start = find_dct2000_real_data(buf);
1718
1719                     real_data_start += change_offset;
1720
1721                     for (i = real_data_start; i < (int) phdr->caplen; i++) {
1722                         if (rand() <= err_prob * RAND_MAX) {
1723                             err_type = rand() / (RAND_MAX / ERR_WT_TOTAL + 1);
1724
1725                             if (err_type < ERR_WT_BIT) {
1726                                 buf[i] ^= 1 << (rand() / (RAND_MAX / 8 + 1));
1727                                 err_type = ERR_WT_TOTAL;
1728                             } else {
1729                                 err_type -= ERR_WT_BYTE;
1730                             }
1731
1732                             if (err_type < ERR_WT_BYTE) {
1733                                 buf[i] = rand() / (RAND_MAX / 255 + 1);
1734                                 err_type = ERR_WT_TOTAL;
1735                             } else {
1736                                 err_type -= ERR_WT_BYTE;
1737                             }
1738
1739                             if (err_type < ERR_WT_ALNUM) {
1740                                 buf[i] = ALNUM_CHARS[rand() / (RAND_MAX / ALNUM_LEN + 1)];
1741                                 err_type = ERR_WT_TOTAL;
1742                             } else {
1743                                 err_type -= ERR_WT_ALNUM;
1744                             }
1745
1746                             if (err_type < ERR_WT_FMT) {
1747                                 if ((unsigned int)i < phdr->caplen - 2)
1748                                     g_strlcpy((char*) &buf[i], "%s", 2);
1749                                 err_type = ERR_WT_TOTAL;
1750                             } else {
1751                                 err_type -= ERR_WT_FMT;
1752                             }
1753
1754                             if (err_type < ERR_WT_AA) {
1755                                 for (j = i; j < (int) phdr->caplen; j++)
1756                                     buf[j] = 0xAA;
1757                                 i = phdr->caplen;
1758                             }
1759                         }
1760                     }
1761                 } /* random error mutation */
1762
1763                 /* Find a packet comment we may need to write */
1764                 if (frames_user_comments) {
1765                     const char *comment =
1766                         (const char*)g_tree_lookup(frames_user_comments, GUINT_TO_POINTER(read_count));
1767                     if (comment != NULL) {
1768                         /* Copy and change rather than modify returned phdr */
1769                         temp_phdr = *phdr;
1770                         temp_phdr.opt_comment = g_strdup(comment);
1771                         phdr = &temp_phdr;
1772                     }
1773                 }
1774
1775                 /* Attempt to dump out current frame to the output file */
1776                 if (!wtap_dump(pdh, phdr, buf, &write_err, &write_err_info)) {
1777                     switch (write_err) {
1778                     case WTAP_ERR_UNWRITABLE_ENCAP:
1779                         /*
1780                          * This is a problem with the particular frame we're
1781                          * writing and the file type and subtype we're
1782                          * writing; note that, and report the frame number
1783                          * and file type/subtype.
1784                          */
1785                         fprintf(stderr,
1786                                 "editcap: Frame %u of \"%s\" has a network type that can't be saved in a \"%s\" file.\n",
1787                                 read_count, argv[optind],
1788                                 wtap_file_type_subtype_string(out_file_type_subtype));
1789                         break;
1790
1791                     case WTAP_ERR_PACKET_TOO_LARGE:
1792                         /*
1793                          * This is a problem with the particular frame we're
1794                          * writing and the file type and subtype we're
1795                          * writing; note that, and report the frame number
1796                          * and file type/subtype.
1797                          */
1798                         fprintf(stderr,
1799                                 "editcap: Frame %u of \"%s\" is too large for a \"%s\" file.\n",
1800                                 read_count, argv[optind],
1801                                 wtap_file_type_subtype_string(out_file_type_subtype));
1802                         break;
1803
1804                     case WTAP_ERR_UNWRITABLE_REC_TYPE:
1805                         /*
1806                          * This is a problem with the particular record we're
1807                          * writing and the file type and subtype we're
1808                          * writing; note that, and report the record number
1809                          * and file type/subtype.
1810                          */
1811                         fprintf(stderr,
1812                                 "editcap: Record %u of \"%s\" has a record type that can't be saved in a \"%s\" file.\n",
1813                                 read_count, argv[optind],
1814                                 wtap_file_type_subtype_string(out_file_type_subtype));
1815                         break;
1816
1817                     case WTAP_ERR_UNWRITABLE_REC_DATA:
1818                         /*
1819                          * This is a problem with the particular record we're
1820                          * writing and the file type and subtype we're
1821                          * writing; note that, and report the record number
1822                          * and file type/subtype.
1823                          */
1824                         fprintf(stderr,
1825                                 "editcap: Record %u of \"%s\" has data that can't be saved in a \"%s\" file.\n(%s)\n",
1826                                 read_count, argv[optind],
1827                                 wtap_file_type_subtype_string(out_file_type_subtype),
1828                                 write_err_info != NULL ? write_err_info : "no information supplied");
1829                         g_free(write_err_info);
1830                         break;
1831
1832                     default:
1833                         fprintf(stderr, "editcap: Error writing to %s: %s\n",
1834                                 filename, wtap_strerror(write_err));
1835                         break;
1836                     }
1837                     ret = DUMP_ERROR;
1838                     goto clean_exit;
1839                 }
1840                 written_count++;
1841             }
1842             count++;
1843         }
1844
1845         g_free(fprefix);
1846         g_free(fsuffix);
1847
1848         if (read_err != 0) {
1849             /* Print a message noting that the read failed somewhere along the
1850              * line. */
1851             fprintf(stderr,
1852                     "editcap: An error occurred while reading \"%s\": %s.\n",
1853                     argv[optind], wtap_strerror(read_err));
1854             if (read_err_info != NULL) {
1855                 fprintf(stderr, "(%s)\n", read_err_info);
1856                 g_free(read_err_info);
1857             }
1858         }
1859
1860         if (!pdh) {
1861             /* No valid packages found, open the outfile so we can write an
1862              * empty header */
1863             g_free (filename);
1864             filename = g_strdup(argv[optind+1]);
1865
1866             pdh = editcap_dump_open(filename,
1867                                     snaplen ? MIN(snaplen, wtap_snapshot_length(wth)): wtap_snapshot_length(wth),
1868                                     shb_hdrs, idb_inf, nrb_hdrs, &write_err);
1869             if (pdh == NULL) {
1870                 fprintf(stderr, "editcap: Can't open or create %s: %s\n",
1871                         filename, wtap_strerror(write_err));
1872                 ret = INVALID_FILE;
1873                 goto clean_exit;
1874             }
1875         }
1876
1877         if (!wtap_dump_close(pdh, &write_err)) {
1878             fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
1879                     wtap_strerror(write_err));
1880             ret = WRITE_ERROR;
1881             goto clean_exit;
1882         }
1883         g_free(filename);
1884
1885         if (frames_user_comments) {
1886             g_tree_destroy(frames_user_comments);
1887         }
1888     }
1889
1890     if (dup_detect) {
1891         fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate window of %i packets.\n",
1892                 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1893                 plurality(duplicate_count, "", "s"), dup_window);
1894     } else if (dup_detect_by_time) {
1895         fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate time window equal to or less than %ld.%09ld seconds.\n",
1896                 count - 1, plurality(count - 1, "", "s"), duplicate_count,
1897                 plurality(duplicate_count, "", "s"),
1898                 (long)relative_time_window.secs,
1899                 (long int)relative_time_window.nsecs);
1900     }
1901
1902 clean_exit:
1903     wtap_block_array_free(shb_hdrs);
1904     wtap_block_array_free(nrb_hdrs);
1905     g_free(idb_inf);
1906     wtap_close(wth);
1907     wtap_cleanup();
1908     free_progdirs();
1909 #ifdef HAVE_PLUGINS
1910     plugins_cleanup();
1911 #endif
1912     return ret;
1913 }
1914
1915 /* Skip meta-information read from file to return offset of real
1916  * protocol data */
1917 static int
1918 find_dct2000_real_data(guint8 *buf)
1919 {
1920     int n = 0;
1921
1922     for (n = 0; buf[n] != '\0'; n++);   /* Context name */
1923     n++;
1924     n++;                                /* Context port number */
1925     for (; buf[n] != '\0'; n++);        /* Timestamp */
1926     n++;
1927     for (; buf[n] != '\0'; n++);        /* Protocol name */
1928     n++;
1929     for (; buf[n] != '\0'; n++);        /* Variant number (as string) */
1930     n++;
1931     for (; buf[n] != '\0'; n++);        /* Outhdr (as string) */
1932     n++;
1933     n += 2;                             /* Direction & encap */
1934
1935     return n;
1936 }
1937
1938 /*
1939  * We support up to 2 chopping regions in a single pass: one specified by the
1940  * positive chop length, and one by the negative chop length.
1941  */
1942 static void
1943 handle_chopping(chop_t chop, struct wtap_pkthdr *out_phdr,
1944                 const struct wtap_pkthdr *in_phdr, guint8 **buf,
1945                 gboolean adjlen)
1946 {
1947     /* Only packets can be chopped. */
1948     if (in_phdr->rec_type != REC_TYPE_PACKET)
1949         return;
1950
1951     /* If we're not chopping anything from one side, then the offset for that
1952      * side is meaningless. */
1953     if (chop.len_begin == 0)
1954         chop.off_begin_pos = chop.off_begin_neg = 0;
1955     if (chop.len_end == 0)
1956         chop.off_end_pos = chop.off_end_neg = 0;
1957
1958     if (chop.off_begin_neg < 0) {
1959         chop.off_begin_pos += in_phdr->caplen + chop.off_begin_neg;
1960         chop.off_begin_neg = 0;
1961     }
1962     if (chop.off_end_pos > 0) {
1963         chop.off_end_neg += chop.off_end_pos - in_phdr->caplen;
1964         chop.off_end_pos = 0;
1965     }
1966
1967     /* If we've crossed chopping regions, swap them */
1968     if (chop.len_begin && chop.len_end) {
1969         if (chop.off_begin_pos > ((int)in_phdr->caplen + chop.off_end_neg)) {
1970             int tmp_len, tmp_off;
1971
1972             tmp_off = in_phdr->caplen + chop.off_end_neg + chop.len_end;
1973             tmp_len = -chop.len_end;
1974
1975             chop.off_end_neg = chop.len_begin + chop.off_begin_pos - in_phdr->caplen;
1976             chop.len_end = -chop.len_begin;
1977
1978             chop.len_begin = tmp_len;
1979             chop.off_begin_pos = tmp_off;
1980         }
1981     }
1982
1983     /* Make sure we don't chop off more than we have available */
1984     if (in_phdr->caplen < (guint32)(chop.off_begin_pos - chop.off_end_neg)) {
1985         chop.len_begin = 0;
1986         chop.len_end = 0;
1987     }
1988     if ((guint32)(chop.len_begin - chop.len_end) >
1989         (in_phdr->caplen - (guint32)(chop.off_begin_pos - chop.off_end_neg))) {
1990         chop.len_begin = in_phdr->caplen - (chop.off_begin_pos - chop.off_end_neg);
1991         chop.len_end = 0;
1992     }
1993
1994     /* Handle chopping from the beginning.  Note that if a beginning offset
1995      * was specified, we need to keep that piece */
1996     if (chop.len_begin > 0) {
1997         *out_phdr = *in_phdr;
1998
1999         if (chop.off_begin_pos > 0) {
2000             memmove(*buf + chop.off_begin_pos,
2001                     *buf + chop.off_begin_pos + chop.len_begin,
2002                     out_phdr->caplen - chop.len_begin);
2003         } else {
2004             *buf += chop.len_begin;
2005         }
2006         out_phdr->caplen -= chop.len_begin;
2007
2008         if (adjlen) {
2009             if (in_phdr->len > (guint32)chop.len_begin)
2010                 out_phdr->len -= chop.len_begin;
2011             else
2012                 out_phdr->len = 0;
2013         }
2014         in_phdr = out_phdr;
2015     }
2016
2017     /* Handle chopping from the end.  Note that if an ending offset was
2018      * specified, we need to keep that piece */
2019     if (chop.len_end < 0) {
2020         *out_phdr = *in_phdr;
2021
2022         if (chop.off_end_neg < 0) {
2023             memmove(*buf + (gint)out_phdr->caplen + (chop.len_end + chop.off_end_neg),
2024                     *buf + (gint)out_phdr->caplen + chop.off_end_neg,
2025                     -chop.off_end_neg);
2026         }
2027         out_phdr->caplen += chop.len_end;
2028
2029         if (adjlen) {
2030             if (((signed int) in_phdr->len + chop.len_end) > 0)
2031                 out_phdr->len += chop.len_end;
2032             else
2033                 out_phdr->len = 0;
2034         }
2035         /*in_phdr = out_phdr;*/
2036     }
2037 }
2038
2039 /*
2040  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
2041  *
2042  * Local variables:
2043  * c-basic-offset: 4
2044  * tab-width: 8
2045  * indent-tabs-mode: nil
2046  * End:
2047  *
2048  * vi: set shiftwidth=4 tabstop=8 expandtab:
2049  * :indentSize=4:tabSize=8:noTabs=true:
2050  */