epan/dissectors/packet-media.c

   1 /* packet-media.c
   2  * Routines for displaying an undissected media type (default case),
   3  * based on the generic "data" dissector.
   4  *
   5  * (C) Olivier Biot, 2004
   6  *
   7  * $Id$
   8  *
   9  * Refer to the AUTHORS file or the AUTHORS section in the man page
  10  * for contacting the author(s) of this file.
  11  *
  12  * Wireshark - Network traffic analyzer
  13  * By Gerald Combs <gerald@wireshark.org>
  14  * Copyright 1998 Gerald Combs
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * as published by the Free Software Foundation; either version 2
  19  * of the License, or (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  29  */
  30
  31 #include "config.h"
  32
  33 #include <glib.h>
  34 #include <epan/packet.h>
  35
  36 /* proto_media cannot be static because it's referenced in the
  37  * print routines
  38  */
  39 int proto_media = -1;
  40 static gint ett_media = -1;
  41 static heur_dissector_list_t heur_subdissector_list;
  42
  43 static int
  44 dissect_media(tvbuff_t *tvb, packet_info *pinfo , proto_tree *tree, void* data)
  45 {
  46     int bytes;
  47     proto_item *ti;
  48     proto_tree *media_tree = 0;
  49
  50     if (dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree, data)) {
  51         return tvb_length(tvb);
  52     }
  53
  54     /* Add media type to the INFO column if it is visible */
  55     col_append_fstr(pinfo->cinfo, COL_INFO, " (%s)", (pinfo->match_string) ? pinfo->match_string : "");
  56
  57     if (tree) {
  58         if ( (bytes = tvb_length(tvb)) > 0 )
  59         {
  60             ti = proto_tree_add_item(tree, proto_media, tvb, 0, -1, ENC_NA);
  61             media_tree = proto_item_add_subtree(ti, ett_media);
  62
  63             if (pinfo->private_data) {
  64                 /* The media type has parameters */
  65                 proto_tree_add_text(media_tree, tvb, 0, bytes,
  66                     "Media Type: %s; %s (%d byte%s)",
  67                     pinfo->match_string, (char *)pinfo->private_data,
  68                     bytes, plurality(bytes, "", "s"));
  69             } else {
  70                 /* The media type has no parameters */
  71                 proto_tree_add_text(media_tree, tvb, 0, bytes,
  72                     "Media Type: %s (%d byte%s)",
  73                     pinfo->match_string ? pinfo->match_string : "",
  74                     bytes, plurality(bytes, "", "s"));
  75             }
  76         }
  77     }
  78
  79     return tvb_length(tvb);
  80 }
  81
  82 void
  83 proto_register_media(void)
  84 {
  85     static gint *ett[] = {
  86         &ett_media
  87     };
  88
  89     proto_media = proto_register_protocol (
  90         "Media Type",   /* name */
  91         "Media",        /* short name */
  92         "media"         /* abbrev */
  93         );
  94     new_register_dissector("media", dissect_media, proto_media);
  95     register_heur_dissector_list("media", &heur_subdissector_list);
  96     proto_register_subtree_array(ett, array_length(ett));
  97
  98     /*
  99      * "Media" is used to dissect something whose normal dissector
 100      * is disabled, so it cannot itself be disabled.
 101      */
 102     proto_set_cant_toggle(proto_media);
 103 }