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 static void
  59 dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  60 {
  61         proto_tree      *subtree;
  62         proto_item      *ti;
  63         gint            offset = 0, next_offset;
  64         gint            len;
  65         const char      *data_name;
  66
  67         data_name = pinfo->match_string;
  68         if (! (data_name && data_name[0])) {
  69                 /*
  70                  * No information from "match_string"
  71                  */
  72                 data_name = (char *)(pinfo->private_data);
  73                 if (! (data_name && data_name[0])) {
  74                         /*
  75                          * No information from "private_data"
  76                          */
  77                         data_name = NULL;
  78                 }
  79         }
  80
  81         if (data_name && check_col(pinfo->cinfo, COL_INFO))
  82                 col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",
  83                                 data_name);
  84
  85         if (tree) {
  86                 ti = proto_tree_add_item(tree, proto_text_lines,
  87                                 tvb, 0, -1, FALSE);
  88                 if (data_name)
  89                         proto_item_append_text(ti, ": %s", data_name);
  90                 subtree = proto_item_add_subtree(ti, ett_text_lines);
  91                 /* Read the media line by line */
  92                 while (tvb_reported_length_remaining(tvb, offset) != 0) {
  93                         /*
  94                          * XXX - we need to be passed the parameters
  95                          * of the content type via "pinfo->private_data",
  96                          * so that we know the character set.  We'd
  97                          * have to handle that character set, which
  98                          * might be a multibyte character set such
  99                          * as "iso-10646-ucs-2", or might require other
 100                          * special processing.
 101                          */
 102                         len = tvb_find_line_end(tvb, offset,
 103                                         tvb_ensure_length_remaining(tvb, offset),
 104                                         &next_offset, FALSE);
 105                         if (len == -1)
 106                                 break;
 107
 108                         /* We use next_offset - offset instead of len in the
 109                          * call to tvb_format_text() so it will include the
 110                          * line terminator(s) (\r and/or \n) in the display.
 111                          */
 112                         proto_tree_add_text(subtree, tvb, offset, next_offset - offset,
 113                                             "%s", tvb_format_text(tvb, offset,
 114                                                                   next_offset - offset));
 115                         offset = next_offset;
 116                 }
 117         }
 118 }
 119
 120 void
 121 proto_register_text_lines(void)
 122 {
 123         static gint *ett[] = {
 124                 &ett_text_lines,
 125         };
 126
 127         proto_register_subtree_array(ett, array_length(ett));
 128
 129         proto_text_lines = proto_register_protocol(
 130                         "Line-based text data", /* Long name */
 131                         "Line-based text data", /* Short name */
 132                         "data-text-lines");             /* Filter name */
 133         register_dissector("data-text-lines", dissect_text_lines, proto_text_lines);
 134 }
 135
 136 void
 137 proto_reg_handoff_text_lines(void)
 138 {
 139         dissector_handle_t text_lines_handle;
 140
 141         text_lines_handle = find_dissector("data-text-lines");
 142
 143         dissector_add_string("media_type", "text/plain", text_lines_handle); /* RFC 2046 */
 144         dissector_add_string("media_type", "text/richtext", text_lines_handle);  /* RFC 1341 */
 145         dissector_add_string("media_type", "text/enriched", text_lines_handle);  /* RFC 1896 */
 146         /* W3C line-based textual media */
 147         dissector_add_string("media_type", "text/html", text_lines_handle);
 148         dissector_add_string("media_type", "text/xml-external-parsed-entity", text_lines_handle);
 149         dissector_add_string("media_type", "text/css", text_lines_handle);
 150         dissector_add_string("media_type", "application/xml-external-parsed-entity", text_lines_handle);
 151         dissector_add_string("media_type", "text/javascript", text_lines_handle);
 152         dissector_add_string("media_type", "application/x-javascript", text_lines_handle);
 153         dissector_add_string("media_type", "application/x-www-form-urlencoded", text_lines_handle);
 154         dissector_add_string("media_type", "application/x-ns-proxy-autoconfig", text_lines_handle);
 155
 156         dissector_add_string("media_type", "text/vnd.sun.j2me.app-descriptor", text_lines_handle);
 157         dissector_add_string("media_type", "application/vnd.poc.refer-to", text_lines_handle);
 158         dissector_add_string("media_type", "application/vnd.drm.message", text_lines_handle);
 159
 160         dissector_add_string("media_type", "application/json", text_lines_handle); /* RFC 4627 */
 161
 162         dissector_add_string("media_type", "application/x-wms-logplaystats", text_lines_handle);
 163         dissector_add_string("media_type", "application/x-rtsp-udp-packetpair", text_lines_handle);
 164 }