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dftest.c
/* dftest.c
 * Shows display filter byte-code, for debugging dfilter routines.
 *
 * $Id: dftest.c 27814 2009-03-22 06:53:17Z guy $
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

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

#include <stdlib.h>
#include <stdio.h>
#include <locale.h>
#include <string.h>
#include <errno.h>

#ifdef NEED_STRERROR_H
#include "strerror.h"
#endif

#include <glib.h>
#include <epan/epan.h>

#include <epan/timestamp.h>
#include <epan/plugins.h>
#include <epan/filesystem.h>
#include <wsutil/privileges.h>
#include <epan/prefs.h>
#include "util.h"
#include "epan/dfilter/dfilter.h"
#include "register.h"

packet_info pi;

static void failure_message(const char *msg_format, va_list ap);
static void open_failure_message(const char *filename, int err,
    gboolean for_writing);
static void read_failure_message(const char *filename, int err);
static void write_failure_message(const char *filename, int err);

int
main(int argc, char **argv)
{
      char        *init_progfile_dir_error;
      char        *text;
      char        *gpf_path, *pf_path;
      int         gpf_open_errno, gpf_read_errno;
      int         pf_open_errno, pf_read_errno;
      e_prefs           *prefs;
      dfilter_t   *df;

      /*
       * Get credential information for later use.
       */
      get_credential_info();

      /*
       * Attempt to get the pathname of the executable file.
       */
      init_progfile_dir_error = init_progfile_dir(argv[0], main);
      if (init_progfile_dir_error != NULL) {
            fprintf(stderr, "dftest: Can't get pathname of dftest program: %s.\n",
                init_progfile_dir_error);
      }

      timestamp_set_type(TS_RELATIVE);

      /* Register all dissectors; we must do this before checking for the
         "-g" flag, as the "-g" flag dumps a list of fields registered
         by the dissectors, and we must do it before we read the preferences,
         in case any dissectors register preferences. */
      epan_init(register_all_protocols,
              register_all_protocol_handoffs, NULL, NULL,
              failure_message, open_failure_message, read_failure_message,
              write_failure_message);

      /* now register the preferences for any non-dissector modules.
      we must do that before we read the preferences as well. */
      prefs_register_modules();

      /* set the c-language locale to the native environment. */
      setlocale(LC_ALL, "");

      prefs = read_prefs(&gpf_open_errno, &gpf_read_errno, &gpf_path,
          &pf_open_errno, &pf_read_errno, &pf_path);
      if (gpf_path != NULL) {
            if (gpf_open_errno != 0) {
                  fprintf(stderr,
                      "can't open global preferences file \"%s\": %s.\n",
                      pf_path, strerror(gpf_open_errno));
            }
            if (gpf_read_errno != 0) {
                  fprintf(stderr,
                      "I/O error reading global preferences file \"%s\": %s.\n",
                      pf_path, strerror(gpf_read_errno));
            }
      }
      if (pf_path != NULL) {
            if (pf_open_errno != 0) {
                  fprintf(stderr,
                      "can't open your preferences file \"%s\": %s.\n",
                      pf_path, strerror(pf_open_errno));
            }
            if (pf_read_errno != 0) {
                  fprintf(stderr,
                      "I/O error reading your preferences file \"%s\": %s.\n",
                      pf_path, strerror(pf_read_errno));
            }
      }

      /* notify all registered modules that have had any of their preferences
      changed either from one of the preferences file or from the command
      line that its preferences have changed. */
      prefs_apply_all();

      /* Check for filter on command line */
      if (argc <= 1) {
            fprintf(stderr, "Usage: dftest <filter>\n");
            exit(1);
      }

      /* Get filter text */
      text = get_args_as_string(argc, argv, 1);

      printf("Filter: \"%s\"\n", text);

      /* Compile it */
      if (!dfilter_compile(text, &df)) {
            fprintf(stderr, "dftest: %s\n", dfilter_error_msg);
            epan_cleanup();
            exit(2);
      }
      printf("dfilter ptr = 0x%08x\n", GPOINTER_TO_INT(df));

      printf("\n\n");

      if (df == NULL)
            printf("Filter is empty\n");
      else
            dfilter_dump(df);

      epan_cleanup();
      exit(0);
}

/*
 * General errors are reported with an console message in "dftest".
 */
static void
failure_message(const char *msg_format, va_list ap)
{
      fprintf(stderr, "dftest: ");
      vfprintf(stderr, msg_format, ap);
      fprintf(stderr, "\n");
}

/*
 * Open/create errors are reported with an console message in "dftest".
 */
static void
open_failure_message(const char *filename, int err, gboolean for_writing)
{
      fprintf(stderr, "dftest: ");
      fprintf(stderr, file_open_error_message(err, for_writing), filename);
      fprintf(stderr, "\n");
}

/*
 * Read errors are reported with an console message in "dftest".
 */
static void
read_failure_message(const char *filename, int err)
{
      fprintf(stderr, "dftest: An error occurred while reading from the file \"%s\": %s.\n",
          filename, strerror(err));
}

/*
 * Write errors are reported with an console message in "dftest".
 */
static void
write_failure_message(const char *filename, int err)
{
      fprintf(stderr, "dftest: An error occurred while writing to the file \"%s\": %s.\n",
          filename, strerror(err));
}

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