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/* Combine two dump files, either by appending or by merging by timestamp
 *
 * $Id: mergecap.c 42553 2012-05-10 16:10:44Z martinm $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Mergecap written by Scott Renfro <scott@renfro.org> based on
 * editcap by Richard Sharpe and Guy Harris
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

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

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#include <string.h>
#include "wtap.h"

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

#include "svnversion.h"
#include "merge.h"
#include "wsutil/file_util.h"

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef _WIN32
#include <wsutil/unicode-utils.h>
#endif /* _WIN32 */

static int
get_natural_int(const char *string, const char *name)
{
  int number;
  char *p;

  number = (int) strtol(string, &p, 10);
  if (p == string || *p != '\0') {
    fprintf(stderr, "mergecap: The specified %s \"%s\" isn't a decimal number\n",
	    name, string);
    exit(1);
  }
  if (number < 0) {
    fprintf(stderr, "mergecap: The specified %s is a negative number\n",
	    name);
    exit(1);
  }
  if (number > INT_MAX) {
    fprintf(stderr, "mergecap: The specified %s is too large (greater than %d)\n",
	    name, INT_MAX);
    exit(1);
  }
  return number;
}

static int
get_positive_int(const char *string, const char *name)
{
  int number;

  number = get_natural_int(string, name);

  if (number == 0) {
    fprintf(stderr, "mergecap: The specified %s is zero\n",
	    name);
    exit(1);
  }

  return number;
}

/*
 * Show the usage
 */
static void
usage(void)
{

  fprintf(stderr, "Mergecap %s"
#ifdef SVNVERSION
	  " (" SVNVERSION " from " SVNPATH ")"
#endif
	  "\n", VERSION);
  fprintf(stderr, "Merge two or more capture files into one.\n");
  fprintf(stderr, "See http://www.wireshark.org for more information.\n");
  fprintf(stderr, "\n");
  fprintf(stderr, "Usage: mergecap [options] -w <outfile>|- <infile> [<infile> ...]\n");
  fprintf(stderr, "\n");
  fprintf(stderr, "Output:\n");
  fprintf(stderr, "  -a                concatenate rather than merge files.\n");
  fprintf(stderr, "                    default is to merge based on frame timestamps.\n");
  fprintf(stderr, "  -s <snaplen>      truncate packets to <snaplen> bytes of data.\n");
  fprintf(stderr, "  -w <outfile>|-    set the output filename to <outfile> or '-' for stdout.\n");
  fprintf(stderr, "  -F <capture type> set the output file type; default is pcapng.\n");
  fprintf(stderr, "                    an empty \"-F\" option will list the file types.\n");
  fprintf(stderr, "  -T <encap type>   set the output file encapsulation type;\n");
  fprintf(stderr, "                    default is the same as the first input file.\n");
  fprintf(stderr, "                    an empty \"-T\" option will list the encapsulation types.\n");
  fprintf(stderr, "\n");
  fprintf(stderr, "Miscellaneous:\n");
  fprintf(stderr, "  -h                display this help and exit.\n");
  fprintf(stderr, "  -v                verbose output.\n");
}

struct string_elem {
    const char *sstr;   /* The short string */
    const char *lstr;   /* The long string */
};

static gint
string_compare(gconstpointer a, gconstpointer b)
{
    return strcmp(((const struct string_elem *)a)->sstr,
        ((const struct string_elem *)b)->sstr);
}

static void
string_elem_print(gpointer data, gpointer not_used _U_)
{
    fprintf(stderr, "    %s - %s\n",
        ((struct string_elem *)data)->sstr,
        ((struct string_elem *)data)->lstr);
}

static void
list_capture_types(void) {
  int i;
  struct string_elem *captypes;
  GSList *list = NULL;

  captypes = g_malloc(sizeof(struct string_elem) * WTAP_NUM_FILE_TYPES);

  fprintf(stderr, "mergecap: The available capture file types for the \"-F\" flag are:\n");
  for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
    if (wtap_dump_can_open(i)) {
      captypes[i].sstr = wtap_file_type_short_string(i);
      captypes[i].lstr = wtap_file_type_string(i);
      list = g_slist_insert_sorted(list, &captypes[i], string_compare);
    }
  }
  g_slist_foreach(list, string_elem_print, NULL);
  g_slist_free(list);
  g_free(captypes);
}

static void
list_encap_types(void) {
    int i;
    struct string_elem *encaps;
    GSList *list = NULL;

    encaps = g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
    fprintf(stderr, "mergecap: The available encapsulation types for the \"-T\" flag are:\n");
    for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
        encaps[i].sstr = wtap_encap_short_string(i);
        if (encaps[i].sstr != NULL) {
            encaps[i].lstr = wtap_encap_string(i);
            list = g_slist_insert_sorted(list, &encaps[i], string_compare);
        }
    }
    g_slist_foreach(list, string_elem_print, NULL);
    g_slist_free(list);
    g_free(encaps);
}

int
main(int argc, char *argv[])
{
  int          opt;

  gboolean     do_append     = FALSE;
  gboolean     verbose       = FALSE;
  int          in_file_count = 0;
  guint        snaplen = 0;
#ifdef PCAP_NG_DEFAULT
  int          file_type = WTAP_FILE_PCAPNG;	/* default to pcap format */
#else
  int          file_type = WTAP_FILE_PCAP;	/* default to pcapng format */
#endif
  int          frame_type = -2;
  int          out_fd;
  merge_in_file_t   *in_files      = NULL, *in_file;
  int          i;
  struct wtap_pkthdr *phdr, snap_phdr;
  wtap_dumper *pdh;
  int          open_err, read_err=0, write_err, close_err;
  gchar       *err_info;
  int          err_fileno;
  char        *out_filename = NULL;
  gboolean     got_read_error = FALSE, got_write_error = FALSE;
  int          count;

#ifdef _WIN32
  arg_list_utf_16to8(argc, argv);
#endif /* _WIN32 */

  /* Process the options first */
  while ((opt = getopt(argc, argv, "hvas:T:F:w:")) != -1) {

    switch (opt) {
    case 'w':
      out_filename = optarg;
      break;

    case 'a':
      do_append = !do_append;
      break;

    case 'T':
      frame_type = wtap_short_string_to_encap(optarg);
      if (frame_type < 0) {
      	fprintf(stderr, "mergecap: \"%s\" isn't a valid encapsulation type\n",
      	    optarg);
        list_encap_types();
      	exit(1);
      }
      break;

    case 'F':
      file_type = wtap_short_string_to_file_type(optarg);
      if (file_type < 0) {
      	fprintf(stderr, "mergecap: \"%s\" isn't a valid capture file type\n",
      	    optarg);
        list_capture_types();
      	exit(1);
      }
      break;

    case 'v':
      verbose = TRUE;
      break;

    case 's':
      snaplen = get_positive_int(optarg, "snapshot length");
      break;

    case 'h':
      usage();
      exit(0);
      break;

    case '?':              /* Bad options if GNU getopt */
      switch(optopt) {
      case'F':
        list_capture_types();
        break;
      case'T':
        list_encap_types();
        break;
      default:
        usage();
      }
      exit(1);
      break;

    }

  }

  /* check for proper args; at a minimum, must have an output
   * filename and one input file
   */
  in_file_count = argc - optind;
  if (!out_filename) {
    fprintf(stderr, "mergecap: an output filename must be set with -w\n");
    fprintf(stderr, "          run with -h for help\n");
    return 1;
  }
  if (in_file_count < 1) {
    fprintf(stderr, "mergecap: No input files were specified\n");
    return 1;
  }

  /* open the input files */
  if (!merge_open_in_files(in_file_count, &argv[optind], &in_files,
                           &open_err, &err_info, &err_fileno)) {
    fprintf(stderr, "mergecap: Can't open %s: %s\n", argv[optind + err_fileno],
        wtap_strerror(open_err));
    switch (open_err) {

    case WTAP_ERR_UNSUPPORTED:
    case WTAP_ERR_UNSUPPORTED_ENCAP:
    case WTAP_ERR_BAD_FILE:
      fprintf(stderr, "(%s)\n", err_info);
      g_free(err_info);
      break;
    }
    return 2;
  }

  if (verbose) {
    for (i = 0; i < in_file_count; i++)
      fprintf(stderr, "mergecap: %s is type %s.\n", argv[optind + i],
              wtap_file_type_string(wtap_file_type(in_files[i].wth)));
  }

  if (snaplen == 0) {
    /*
     * Snapshot length not specified - default to the maximum of the
     * snapshot lengths of the input files.
     */
    snaplen = merge_max_snapshot_length(in_file_count, in_files);
  }

  /* set the outfile frame type */
  if (frame_type == -2) {
    /*
     * Default to the appropriate frame type for the input files.
     */
    frame_type = merge_select_frame_type(in_file_count, in_files);
    if (verbose) {
      if (frame_type == WTAP_ENCAP_PER_PACKET) {
        /*
         * Find out why we had to choose WTAP_ENCAP_PER_PACKET.
         */
        int first_frame_type, this_frame_type;

        first_frame_type = wtap_file_encap(in_files[0].wth);
        for (i = 1; i < in_file_count; i++) {
          this_frame_type = wtap_file_encap(in_files[i].wth);
          if (first_frame_type != this_frame_type) {
            fprintf(stderr, "mergecap: multiple frame encapsulation types detected\n");
            fprintf(stderr, "          defaulting to WTAP_ENCAP_PER_PACKET\n");
            fprintf(stderr, "          %s had type %s (%s)\n",
                    in_files[0].filename,
                    wtap_encap_string(first_frame_type),
                    wtap_encap_short_string(first_frame_type));
            fprintf(stderr, "          %s had type %s (%s)\n",
                    in_files[i].filename,
                    wtap_encap_string(this_frame_type),
                    wtap_encap_short_string(this_frame_type));
            break;
          }
        }
      }
      fprintf(stderr, "mergecap: selected frame_type %s (%s)\n",
              wtap_encap_string(frame_type),
              wtap_encap_short_string(frame_type));
    }
  }

  /* open the outfile */
  if (strncmp(out_filename, "-", 2) == 0) {
    /* use stdout as the outfile */
    out_fd = 1 /*stdout*/;
  } else {
    /* open the outfile */
    out_fd = ws_open(out_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
    if (out_fd == -1) {
      fprintf(stderr, "mergecap: Couldn't open output file %s: %s\n",
              out_filename, g_strerror(errno));
      exit(1);
    }
  }

  /* prepare the outfile */
  if(file_type == WTAP_FILE_PCAPNG ){
    wtapng_section_t	*shb_hdr;
    GString *comment_gstr;

    shb_hdr = g_new(wtapng_section_t,1);
    comment_gstr = g_string_new("File created by merging: \n");

    for (i = 0; i < in_file_count; i++) {
        g_string_append_printf(comment_gstr, "File%d: %s \n",i+1,in_files[i].filename);
    }
    shb_hdr->section_length = -1;
    /* options */
    shb_hdr->opt_comment   =	comment_gstr->str;		/* NULL if not available */
    shb_hdr->shb_hardware  =	NULL;		/* NULL if not available, UTF-8 string containing the description of the hardware used to create this section. */
    shb_hdr->shb_os        =	NULL;		/* NULL if not available, UTF-8 string containing the name of the operating system used to create this section. */
    shb_hdr->shb_user_appl =	"mergecap";	/* NULL if not available, UTF-8 string containing the name of the application used to create this section. */

    pdh = wtap_dump_fdopen_ng(out_fd, file_type, frame_type, snaplen,
                              FALSE /* compressed */, shb_hdr, NULL /* wtapng_iface_descriptions_t *idb_inf */, &open_err);
    g_string_free(comment_gstr, TRUE);
  }else{
       pdh = wtap_dump_fdopen(out_fd, file_type, frame_type, snaplen, FALSE /* compressed */, &open_err);
  }
  if (pdh == NULL) {
    merge_close_in_files(in_file_count, in_files);
    g_free(in_files);
    fprintf(stderr, "mergecap: Can't open or create %s: %s\n", out_filename,
            wtap_strerror(open_err));
    exit(1);
  }

  /* do the merge (or append) */
  count = 1;
  for (;;) {
    if (do_append)
      in_file = merge_append_read_packet(in_file_count, in_files, &read_err,
                                         &err_info);
    else
      in_file = merge_read_packet(in_file_count, in_files, &read_err,
                                  &err_info);
    if (in_file == NULL) {
      /* EOF */
      break;
    }

    if (read_err != 0) {
      /* I/O error reading from in_file */
      got_read_error = TRUE;
      break;
    }

    if (verbose)
      fprintf(stderr, "Record: %u\n", count++);

    /* We simply write it, perhaps after truncating it; we could do other
     * things, like modify it. */
    phdr = wtap_phdr(in_file->wth);
    if (snaplen != 0 && phdr->caplen > snaplen) {
      snap_phdr = *phdr;
      snap_phdr.caplen = snaplen;
      phdr = &snap_phdr;
    }

    if (!wtap_dump(pdh, phdr, wtap_pseudoheader(in_file->wth),
         wtap_buf_ptr(in_file->wth), &write_err)) {
      got_write_error = TRUE;
      break;
    }
  }

  merge_close_in_files(in_file_count, in_files);
  if (!got_read_error && !got_write_error) {
    if (!wtap_dump_close(pdh, &write_err))
      got_write_error = TRUE;
  } else
    wtap_dump_close(pdh, &close_err);

  if (got_read_error) {
    /*
     * Find the file on which we got the error, and report the error.
     */
    for (i = 0; i < in_file_count; i++) {
      if (in_files[i].state == GOT_ERROR) {
        fprintf(stderr, "mergecap: Error reading %s: %s\n",
                in_files[i].filename, wtap_strerror(read_err));
        switch (read_err) {

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

  if (got_write_error) {
    switch (write_err) {

    case WTAP_ERR_UNSUPPORTED_ENCAP:
      /*
       * This is a problem with the particular frame we're writing;
       * note that, and give the frame number.
       */
      fprintf(stderr, "mergecap: Frame %u of \"%s\" has a network type that can't be saved in a file with that format\n.",
              in_file->packet_num, in_file->filename);
      break;

    default:
      fprintf(stderr, "mergecap: Error writing to outfile: %s\n",
              wtap_strerror(write_err));
      break;
    }
  }

  g_free(in_files);

  return (!got_read_error && !got_write_error) ? 0 : 2;
}