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/* packet-text-media.c
* Routines for text-based media dissection.
*
* NOTE - The media type is either found in pinfo->match_string,
* or passed into the dissector
*
* (C) Olivier Biot, 2004.
*
* Refer to the AUTHORS file or the AUTHORS section in the man page
* for contacting the author(s) of this file.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Edit this file with 4-space tabs */
#include "config.h"
#include <epan/packet.h>
#include "packet-media-type.h"
/*
* Media dissector for line-based text media like text/plain, message/http.
*
* TODO - character set and chunked transfer-coding
*/
void proto_register_text_lines(void);
void proto_reg_handoff_text_lines(void);
/* Filterable header fields */
static int proto_text_lines;
/* Subtrees */
static int ett_text_lines;
/* Dissector handles */
static dissector_handle_t xml_handle;
static int
dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
proto_tree *subtree;
proto_item *ti;
int offset = 0, next_offset;
int len;
media_content_info_t *content_info;
const char *data_name;
int length = tvb_captured_length(tvb);
/* Check if this is actually xml
* If there is less than 38 characters this is not XML
* <?xml version="1.0" encoding="UTF-8"?>
*/
if(length > 38){
if (tvb_strncaseeql(tvb, 0, "<?xml", 5) == 0){
call_dissector(xml_handle, tvb, pinfo, tree);
return length;
}
}
data_name = pinfo->match_string;
if (! (data_name && data_name[0])) {
/*
* No information from "match_string"
*/
content_info = (media_content_info_t *)data;
if (content_info == NULL) {
/*
* No information from dissector data
*/
data_name = NULL;
} else {
data_name = content_info->media_str;
if (! (data_name && data_name[0])) {
/*
* No information from dissector data
*/
data_name = NULL;
}
}
}
if (data_name)
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",
data_name);
if (tree) {
unsigned lines_read = 0;
ti = proto_tree_add_item(tree, proto_text_lines,
tvb, 0, -1, ENC_NA);
if (data_name)
proto_item_append_text(ti, ": %s", data_name);
subtree = proto_item_add_subtree(ti, ett_text_lines);
/* Read the media line by line */
while (tvb_offset_exists(tvb, offset)) {
/*
* XXX - we need to be passed the parameters
* of the content type via data parameter,
* so that we know the character set. We'd
* have to handle that character set, which
* might be a multibyte character set such
* as "iso-10646-ucs-2", or might require other
* special processing.
*/
len = tvb_find_line_end(tvb, offset, -1, &next_offset, false);
if (len == -1)
break;
/* We use next_offset - offset instead of len in the
* call to proto_tree_add_format_text() so it will include the
* line terminator(s) (\r and/or \n) in the display.
*/
proto_tree_add_format_text(subtree, tvb, offset, next_offset - offset);
lines_read++;
offset = next_offset;
}
proto_item_append_text(subtree, " (%u lines)", lines_read);
}
return length;
}
void
proto_register_text_lines(void)
{
static int *ett[] = {
&ett_text_lines,
};
proto_register_subtree_array(ett, array_length(ett));
proto_text_lines = proto_register_protocol("Line-based text data", "Line-based text data", "data-text-lines");
register_dissector("data-text-lines", dissect_text_lines, proto_text_lines);
}
void
proto_reg_handoff_text_lines(void)
{
dissector_handle_t text_lines_handle;
text_lines_handle = find_dissector("data-text-lines");
dissector_add_string("media_type", "text/plain", text_lines_handle); /* RFC 2046 */
dissector_add_string("media_type", "text/richtext", text_lines_handle); /* RFC 1341 */
dissector_add_string("media_type", "text/enriched", text_lines_handle); /* RFC 1896 */
dissector_add_string("media_type", "text/parameters", text_lines_handle);
/* W3C line-based textual media */
dissector_add_string("media_type", "text/html", text_lines_handle);
dissector_add_string("media_type", "text/xml-external-parsed-entity", text_lines_handle);
dissector_add_string("media_type", "text/css", text_lines_handle);
dissector_add_string("media_type", "application/xml-external-parsed-entity", text_lines_handle);
dissector_add_string("media_type", "text/javascript", text_lines_handle);
dissector_add_string("media_type", "application/x-javascript", text_lines_handle);
dissector_add_string("media_type", "application/x-tia-p25-issi", text_lines_handle);
dissector_add_string("media_type", "application/x-tia-p25-sndcp", text_lines_handle);
dissector_add_string("media_type", "application/x-ns-proxy-autoconfig", text_lines_handle);
dissector_add_string("media_type", "text/vnd.sun.j2me.app-descriptor", text_lines_handle);
dissector_add_string("media_type", "application/vnd.poc.refer-to", text_lines_handle);
dissector_add_string("media_type", "application/vnd.drm.message", text_lines_handle);
dissector_add_string("media_type", "application/x-wms-logplaystats", text_lines_handle);
dissector_add_string("media_type", "application/x-rtsp-udp-packetpair", text_lines_handle);
xml_handle = find_dissector_add_dependency("xml", proto_text_lines);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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