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: packet-text-media.c,v 1.8 2004/05/04 07:24:33 guy Exp $
  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  * Ethereal - Network traffic analyzer
  15  * By Gerald Combs <gerald@ethereal.com>
  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 <string.h>
  40 #include <ctype.h>
  41
  42 #include <glib.h>
  43 #include <epan/packet.h>
  44 #include <epan/strutil.h>
  45
  46
  47 /*
  48  * Media dissector for line-based text media like text/plain, message/http.
  49  *
  50  * TODO - character set and chunked transfer-coding
  51  */
  52
  53 /* Filterable header fields */
  54 static gint proto_text_lines = -1;
  55
  56 /* Subtrees */
  57 static gint ett_text_lines = -1;
  58
  59 /* Dissector handles */
  60 static dissector_handle_t text_lines_handle;
  61
  62 static void
  63 dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  64 {
  65         proto_tree      *subtree;
  66         proto_item      *ti;
  67         gint            offset = 0, next_offset;
  68         gint            len;
  69         const char      *data_name;
  70
  71         data_name = pinfo->match_string;
  72         if (! (data_name && data_name[0])) {
  73                 /*
  74                  * No information from "match_string"
  75                  */
  76                 data_name = (char *)(pinfo->private_data);
  77                 if (! (data_name && data_name[0])) {
  78                         /*
  79                          * No information from "private_data"
  80                          */
  81                         data_name = NULL;
  82                 }
  83         }
  84
  85         if (data_name && check_col(pinfo->cinfo, COL_INFO))
  86                 col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",
  87                                 data_name);
  88
  89         if (tree) {
  90                 ti = proto_tree_add_item(tree, proto_text_lines,
  91                                 tvb, 0, -1, FALSE);
  92                 if (data_name)
  93                         proto_item_append_text(ti, ": %s", data_name);
  94                 subtree = proto_item_add_subtree(ti, ett_text_lines);
  95                 /* Read the media line by line */
  96                 while (tvb_reported_length_remaining(tvb, offset) != 0) {
  97                         /*
  98                          * XXX - we need to be passed the parameters
  99                          * of the content type via "pinfo->private_data",
 100                          * so that we know the character set.  We'd
 101                          * have to handle that character set, which
 102                          * might be a multibyte character set such
 103                          * as "iso-10646-ucs-2", or might require other
 104                          * special processing.
 105                          */
 106                         len = tvb_find_line_end(tvb, offset,
 107                                         tvb_ensure_length_remaining(tvb, offset),
 108                                         &next_offset, FALSE);
 109                         if (len == -1)
 110                                 break;
 111                         proto_tree_add_text(subtree, tvb, offset, next_offset - offset,
 112                                         "%s", tvb_format_text(tvb, offset, len));
 113                         offset = next_offset;
 114                 }
 115         }
 116 }
 117
 118 void
 119 proto_register_text_lines(void)
 120 {
 121         static gint *ett[] = {
 122                 &ett_text_lines,
 123         };
 124
 125         proto_register_subtree_array(ett, array_length(ett));
 126
 127         proto_text_lines = proto_register_protocol(
 128                         "Line-based text data", /* Long name */
 129                         "Line-based text data", /* Short name */
 130                         "data-text-lines");             /* Filter name */
 131         register_dissector("data-text-lines", dissect_text_lines, proto_text_lines);
 132 }
 133
 134 void
 135 proto_reg_handoff_text_lines(void)
 136 {
 137         text_lines_handle = create_dissector_handle(
 138                                         dissect_text_lines, proto_text_lines);
 139
 140         dissector_add_string("media_type", "text/plain", text_lines_handle);
 141         /* W3C line-based textual media */
 142         dissector_add_string("media_type", "text/html", text_lines_handle);
 143         dissector_add_string("media_type", "text/xml", text_lines_handle);
 144         dissector_add_string("media_type", "text/xml-external-parsed-entity", text_lines_handle);
 145         dissector_add_string("media_type", "text/css", text_lines_handle);
 146         dissector_add_string("media_type", "application/xml", text_lines_handle);
 147         dissector_add_string("media_type", "application/xml-external-parsed-entity", text_lines_handle);
 148         dissector_add_string("media_type", "application/xml-dtd", text_lines_handle);
 149         dissector_add_string("media_type", "application/x-javascript", text_lines_handle);
 150         dissector_add_string("media_type", "application/x-www-form-urlencoded", text_lines_handle);
 151         dissector_add_string("media_type", "application/x-ns-proxy-autoconfig", text_lines_handle);
 152         /* WAP and OMA line-based textual media */
 153         dissector_add_string("media_type", "text/vnd.wap.wml", text_lines_handle);
 154         dissector_add_string("media_type", "text/vnd.wap.si", text_lines_handle);
 155         dissector_add_string("media_type", "text/vnd.wap.sl", text_lines_handle);
 156         dissector_add_string("media_type", "text/vnd.wap.co", text_lines_handle);
 157         dissector_add_string("media_type", "text/vnd.wap.emn", text_lines_handle);
 158         dissector_add_string("media_type", "application/vnd.wv.csp+xml", text_lines_handle);
 159         /* Other */
 160         dissector_add_string("media_type", "text/vnd.sun.j2me.app-descriptor", text_lines_handle);
 161         dissector_add_string("media_type", "application/smil", text_lines_handle);
 162 }