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/* packet-data.c
* Routines for raw data (default case)
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/to_str.h>
#include <wsutil/wsgcrypt.h>
#include <wsutil/str_util.h>
#include "packet-tls.h"
#include "packet-dtls.h"
void proto_register_data(void);
void proto_reg_handoff_data(void);
static int proto_data;
static int hf_data_data;
static int hf_data_len;
static int hf_data_md5_hash;
static int hf_data_text;
static int hf_data_uncompressed_data;
static int hf_data_uncompressed_len;
static bool new_pane;
static bool uncompress_data;
static bool show_as_text;
static bool generate_md5_hash;
static int ett_data;
static dissector_handle_t data_handle;
static int
dissect_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int bytes;
char *display_str;
if (tree) {
bytes = tvb_captured_length(tvb);
if (bytes > 0) {
tvbuff_t *data_tvb;
tvbuff_t *uncompr_tvb = NULL;
int uncompr_len = 0;
proto_item *ti;
proto_tree *data_tree;
if (new_pane) {
uint8_t *real_data = (uint8_t *)tvb_memdup(pinfo->pool, tvb, 0, bytes);
data_tvb = tvb_new_child_real_data(tvb,real_data,bytes,bytes);
add_new_data_source(pinfo, data_tvb, "Not dissected data bytes");
} else {
data_tvb = tvb;
}
ti = proto_tree_add_protocol_format(tree, proto_data, tvb,
0,
bytes, "Data (%d byte%s)", bytes,
plurality(bytes, "", "s"));
data_tree = proto_item_add_subtree(ti, ett_data);
proto_tree_add_item(data_tree, hf_data_data, data_tvb, 0, bytes, ENC_NA);
if (uncompress_data) {
uncompr_tvb = tvb_child_uncompress_zlib(data_tvb, data_tvb, 0, tvb_reported_length(data_tvb));
if (uncompr_tvb) {
uncompr_len = tvb_reported_length(uncompr_tvb);
add_new_data_source(pinfo, uncompr_tvb, "Uncompressed Data");
proto_tree_add_item(data_tree, hf_data_uncompressed_data, uncompr_tvb, 0, uncompr_len, ENC_NA);
ti = proto_tree_add_int(data_tree, hf_data_uncompressed_len, uncompr_tvb, 0, 0, uncompr_len);
proto_item_set_generated (ti);
}
}
if (show_as_text) {
tvbuff_t *text_tvb;
int text_length;
if (uncompr_tvb && uncompr_len > 0) {
text_tvb = uncompr_tvb;
text_length = uncompr_len;
} else {
text_tvb = data_tvb;
text_length = bytes;
}
proto_tree_add_item_ret_display_string(data_tree, hf_data_text, text_tvb, 0, text_length, ENC_UTF_8, pinfo->pool, &display_str);
col_add_str(pinfo->cinfo, COL_INFO, display_str);
}
if(generate_md5_hash) {
const uint8_t *cp;
uint8_t digest[HASH_MD5_LENGTH];
const char *digest_string;
cp = tvb_get_ptr(tvb, 0, bytes);
gcry_md_hash_buffer(GCRY_MD_MD5, digest, cp, bytes);
digest_string = bytes_to_str_punct(pinfo->pool, digest, HASH_MD5_LENGTH, '\0');
ti = proto_tree_add_string(data_tree, hf_data_md5_hash, tvb, 0, 0, digest_string);
proto_item_set_generated(ti);
}
ti = proto_tree_add_int(data_tree, hf_data_len, data_tvb, 0, 0, bytes);
proto_item_set_generated (ti);
}
}
return tvb_captured_length(tvb);
}
void
proto_register_data(void)
{
static hf_register_info hf[] = {
{ &hf_data_data,
{ "Data", "data.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_text,
{ "Text", "data.text",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_uncompressed_data,
{ "Uncompressed Data", "data.uncompressed.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_uncompressed_len,
{ "Uncompressed Length", "data.uncompressed.len",
FT_INT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_len,
{ "Length", "data.len",
FT_INT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_md5_hash,
{ "Payload MD5 hash", "data.md5_hash",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static int *ett[] = {
&ett_data
};
module_t *module_data;
proto_data = proto_register_protocol (
"Data", /* name */
"Data", /* short name */
"data" /* abbrev */
);
data_handle = register_dissector("data", dissect_data, proto_data);
proto_register_field_array(proto_data, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
module_data = prefs_register_protocol( proto_data, NULL);
prefs_register_bool_preference(module_data,
"datapref.newpane",
"Show not dissected data on new Packet Bytes pane",
"Show not dissected data on new Packet Bytes pane",
&new_pane);
#if defined (HAVE_ZLIB) || defined (HAVE_ZLIBNG)
prefs_register_bool_preference(module_data,
"uncompress_data",
"Try to uncompress zlib compressed data",
"Try to uncompress zlib compressed data and show as uncompressed if successful",
&uncompress_data);
#endif
prefs_register_bool_preference(module_data,
"show_as_text",
"Show data as text",
"Show data as text in the Packet Details pane",
&show_as_text);
prefs_register_bool_preference(module_data,
"md5_hash",
"Generate MD5 hash",
"Whether or not MD5 hashes should be generated and shown for each payload.",
&generate_md5_hash);
/*
* "Data" is used to dissect something whose normal dissector
* is disabled, so it cannot itself be disabled.
*/
proto_set_cant_toggle(proto_data);
}
static void
add_foreach_decode_as(const char *table_name, const char *ui_name _U_, void *user_data)
{
dissector_handle_t handle = (dissector_handle_t) user_data;
dissector_table_t dissector_table = find_dissector_table(table_name);
if (dissector_table_supports_decode_as(dissector_table))
dissector_add_for_decode_as(table_name, handle);
}
void
proto_reg_handoff_data(void)
{
dissector_add_string("media_type", "application/octet-stream", data_handle);
ssl_dissector_add(0, data_handle);
dtls_dissector_add(0, data_handle);
dissector_all_tables_foreach_table(add_foreach_decode_as, (void *)data_handle, NULL);
}
/*
* 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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