epan/dissectors/packet-text-media.c

   1 /* packet-text-media.c
   2  * Routines for text-based media dissection.
   3  *
   4  * NOTE - The media type is either found in pinfo->match_string
   5  *        or in pinfo->private_data.
   6  *
   7  * (C) Olivier Biot, 2004.
   8  *
   9  * $Id$
  10  *
  11  * Refer to the AUTHORS file or the AUTHORS section in the man page
  12  * for contacting the author(s) of this file.
  13  *
  14  * Wireshark - Network traffic analyzer
  15  * By Gerald Combs <gerald@wireshark.org>
  16  * Copyright 1998 Gerald Combs
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License
  20  * as published by the Free Software Foundation; either version 2
  21  * of the License, or (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  31  */
  32
  33 /* Edit this file with 4-space tabs */
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <ctype.h>
  40
  41 #include <glib.h>
  42 #include <epan/packet.h>
  43 #include <epan/strutil.h>
  44
  45
  46 /*
  47  * Media dissector for line-based text media like text/plain, message/http.
  48  *
  49  * TODO - character set and chunked transfer-coding
  50  */
  51
  52 /* Filterable header fields */
  53 static gint proto_text_lines = -1;
  54
  55 /* Subtrees */
  56 static gint ett_text_lines = -1;
  57
  58 /* Dissector handles */
  59 static dissector_handle_t xml_handle;
  60
  61 static void
  62 dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  63 {
  64         proto_tree      *subtree;
  65         proto_item      *ti;
  66         gint            offset = 0, next_offset;
  67         gint            len;
  68         const char      *data_name;
  69         guint8          word[6];
  70         int length = tvb_length(tvb);
  71
  72         /* Check if this is actually xml
  73          * If there is less than 38 characters this is not XML
  74          * <?xml version="1.0" encoding="UTF-8"?>
  75          */
  76         if(length > 38){
  77                 tvb_get_nstringz0(tvb, 0, sizeof(word),word);
  78                 if (g_ascii_strncasecmp(word, "<?xml", 5) == 0){
  79                         call_dissector(xml_handle, tvb, pinfo, tree);
  80                         return;
  81                 }
  82         }
  83
  84         data_name = pinfo->match_string;
  85         if (! (data_name && data_name[0])) {
  86                 /*
  87                  * No information from "match_string"
  88                  */
  89                 data_name = (char *)(pinfo->private_data);
  90                 if (! (data_name && data_name[0])) {
  91                         /*
  92                          * No information from "private_data"
  93                          */
  94                         data_name = NULL;
  95                 }
  96         }
  97
  98         if (data_name && check_col(pinfo->cinfo, COL_INFO))
  99                 col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",
 100                                 data_name);
 101
 102         if (tree) {
 103                 ti = proto_tree_add_item(tree, proto_text_lines,
 104                                 tvb, 0, -1, ENC_NA);
 105                 if (data_name)
 106                         proto_item_append_text(ti, ": %s", data_name);
 107                 subtree = proto_item_add_subtree(ti, ett_text_lines);
 108                 /* Read the media line by line */
 109                 while (tvb_reported_length_remaining(tvb, offset) != 0) {
 110                         /*
 111                          * XXX - we need to be passed the parameters
 112                          * of the content type via "pinfo->private_data",
 113                          * so that we know the character set.  We'd
 114                          * have to handle that character set, which
 115                          * might be a multibyte character set such
 116                          * as "iso-10646-ucs-2", or might require other
 117                          * special processing.
 118                          */
 119                         len = tvb_find_line_end(tvb, offset,
 120                                         tvb_ensure_length_remaining(tvb, offset),
 121                                         &next_offset, FALSE);
 122                         if (len == -1)
 123                                 break;
 124
 125                         /* We use next_offset - offset instead of len in the
 126                          * call to tvb_format_text() so it will include the
 127                          * line terminator(s) (\r and/or \n) in the display.
 128                          */
 129                         proto_tree_add_text(subtree, tvb, offset, next_offset - offset,
 130                                             "%s", tvb_format_text(tvb, offset,
 131                                                                   next_offset - offset));
 132                         offset = next_offset;
 133                 }
 134         }
 135 }
 136
 137 void
 138 proto_register_text_lines(void)
 139 {
 140         static gint *ett[] = {
 141                 &ett_text_lines,
 142         };
 143
 144         proto_register_subtree_array(ett, array_length(ett));
 145
 146         proto_text_lines = proto_register_protocol(
 147                         "Line-based text data", /* Long name */
 148                         "Line-based text data", /* Short name */
 149                         "data-text-lines");             /* Filter name */
 150         register_dissector("data-text-lines", dissect_text_lines, proto_text_lines);
 151 }
 152
 153 void
 154 proto_reg_handoff_text_lines(void)
 155 {
 156         dissector_handle_t text_lines_handle;
 157
 158         text_lines_handle = find_dissector("data-text-lines");
 159
 160         dissector_add_string("media_type", "text/plain", text_lines_handle); /* RFC 2046 */
 161         dissector_add_string("media_type", "text/richtext", text_lines_handle);  /* RFC 1341 */
 162         dissector_add_string("media_type", "text/enriched", text_lines_handle);  /* RFC 1896 */
 163         /* W3C line-based textual media */
 164         dissector_add_string("media_type", "text/html", text_lines_handle);
 165         dissector_add_string("media_type", "text/xml-external-parsed-entity", text_lines_handle);
 166         dissector_add_string("media_type", "text/css", text_lines_handle);
 167         dissector_add_string("media_type", "application/xml-external-parsed-entity", text_lines_handle);
 168         dissector_add_string("media_type", "text/javascript", text_lines_handle);
 169         dissector_add_string("media_type", "application/x-javascript", text_lines_handle);
 170         dissector_add_string("media_type", "application/x-www-form-urlencoded", text_lines_handle);
 171         dissector_add_string("media_type", "application/x-ns-proxy-autoconfig", text_lines_handle);
 172
 173         dissector_add_string("media_type", "text/vnd.sun.j2me.app-descriptor", text_lines_handle);
 174         dissector_add_string("media_type", "application/vnd.poc.refer-to", text_lines_handle);
 175         dissector_add_string("media_type", "application/vnd.drm.message", text_lines_handle);
 176
 177         dissector_add_string("media_type", "application/x-wms-logplaystats", text_lines_handle);
 178         dissector_add_string("media_type", "application/x-rtsp-udp-packetpair", text_lines_handle);
 179
 180         xml_handle = find_dissector("xml");
 181 }