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wireshark/epan/decode_as.c

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/* decode_as.c
* Routines for dissector Decode As handlers
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdlib.h>
#include <glib.h>
#include "decode_as.h"
#include "packet.h"
#include "prefs.h"
#include "prefs-int.h"
#include "epan/dissectors/packet-dcerpc.h"
#include "wsutil/filesystem.h"
#include "wsutil/file_util.h"
GList *decode_as_list = NULL;
/*
* A list of dissectors that need to be reset.
*/
GSList *dissector_reset_list = NULL;
void register_decode_as(decode_as_t* reg)
{
/* Ensure valid functions */
DISSECTOR_ASSERT(reg->populate_list);
DISSECTOR_ASSERT(reg->reset_value);
DISSECTOR_ASSERT(reg->change_value);
decode_as_list = g_list_append(decode_as_list, reg);
}
struct decode_as_default_populate
{
decode_as_add_to_list_func add_to_list;
gpointer ui_element;
};
static void
decode_proto_add_to_list (const gchar *table_name, gpointer value, gpointer user_data)
{
struct decode_as_default_populate* populate = (struct decode_as_default_populate*)user_data;
const gchar *proto_name;
gint i;
dissector_handle_t handle;
handle = (dissector_handle_t)value;
proto_name = dissector_handle_get_short_name(handle);
i = dissector_handle_get_protocol_index(handle);
if (i >= 0 && !proto_is_protocol_enabled(find_protocol_by_id(i)))
return;
populate->add_to_list(table_name, proto_name, value, populate->ui_element);
}
void decode_as_default_populate_list(const gchar *table_name, decode_as_add_to_list_func add_to_list, gpointer ui_element)
{
struct decode_as_default_populate populate;
populate.add_to_list = add_to_list;
populate.ui_element = ui_element;
dissector_table_foreach_handle(table_name, decode_proto_add_to_list, &populate);
}
gboolean decode_as_default_reset(const char *name, const gpointer pattern)
{
dissector_reset_uint(name, GPOINTER_TO_UINT(pattern));
return TRUE;
}
gboolean decode_as_default_change(const char *name, const gpointer pattern, gpointer handle, gchar* list_name _U_)
{
dissector_handle_t* dissector = (dissector_handle_t*)handle;
if (dissector != NULL)
dissector_change_uint(name, GPOINTER_TO_UINT(pattern), *dissector);
return TRUE;
}
/* UI-related functions */
/*
* Data structure used as user data when iterating dissector handles
*/
struct lookup_entry {
gchar* dissector_short_name;
dissector_handle_t handle;
};
/*
* Data structure for tracking which dissector need to be reset. This
* structure is necessary as a hash table entry cannot be removed
* while a g_hash_table_foreach walk is in progress.
*/
struct dissector_delete_item {
/* The name of the dissector table */
const gchar *ddi_table_name;
/* The type of the selector in that dissector table */
ftenum_t ddi_selector_type;
/* The selector in the dissector table */
union {
guint sel_uint;
char *sel_string;
} ddi_selector;
};
typedef struct lookup_entry lookup_entry_t;
/*
* A callback function to changed a dissector_handle if matched
* This is used when iterating a dissector table
*/
static void
change_dissector_if_matched(gpointer item, gpointer user_data)
{
dissector_handle_t handle = (dissector_handle_t)item;
lookup_entry_t * lookup = (lookup_entry_t *)user_data;
if (strcmp(lookup->dissector_short_name, dissector_handle_get_short_name(handle)) == 0) {
lookup->handle = handle;
}
}
/*
* A callback function to parse each "decode as" entry in the file and apply the change
*/
static prefs_set_pref_e
read_set_decode_as_entries(gchar *key, const gchar *value,
void *user_data _U_,
gboolean return_range_errors _U_)
{
gchar *values[4] = {NULL, NULL, NULL, NULL};
gchar delimiter[4] = {',', ',', ',','\0'};
gchar *pch;
guint i, j;
dissector_table_t sub_dissectors;
prefs_set_pref_e retval = PREFS_SET_OK;
gboolean is_valid = FALSE;
if (strcmp(key, DECODE_AS_ENTRY) == 0) {
/* Parse csv into table, selector, initial, current */
for (i = 0; i < 4; i++) {
pch = strchr(value, delimiter[i]);
if (pch == NULL) {
for (j = 0; j < i; j++) {
g_free(values[j]);
}
return PREFS_SET_SYNTAX_ERR;
}
values[i] = g_strndup(value, pch - value);
value = pch + 1;
}
sub_dissectors = find_dissector_table(values[0]);
if (sub_dissectors != NULL) {
lookup_entry_t lookup;
lookup.dissector_short_name = values[3];
lookup.handle = NULL;
g_slist_foreach(dissector_table_get_dissector_handles(sub_dissectors),
change_dissector_if_matched, &lookup);
if (lookup.handle != NULL || g_ascii_strcasecmp(values[3], DECODE_AS_NONE) == 0) {
is_valid = TRUE;
}
if (is_valid) {
dissector_change_uint(values[0], atoi(values[1]), lookup.handle);
decode_build_reset_list(g_strdup(values[0]), dissector_table_get_type(sub_dissectors),
g_strdup(values[1]), NULL, NULL);
}
} else {
retval = PREFS_SET_SYNTAX_ERR;
}
} else {
retval = PREFS_SET_NO_SUCH_PREF;
}
for (i = 0; i < 4; i++) {
g_free(values[i]);
}
return retval;
}
void load_decode_as_entries(void)
{
char *daf_path;
FILE *daf;
if (dissector_reset_list) {
decode_clear_all();
}
daf_path = get_persconffile_path(DECODE_AS_ENTRIES_FILE_NAME, TRUE);
if ((daf = ws_fopen(daf_path, "r")) != NULL) {
read_prefs_file(daf_path, daf, read_set_decode_as_entries, NULL);
fclose(daf);
}
g_free(daf_path);
}
/*
* A typedef for the data structure to track the original dissector
* used for any given port on any given protocol.
*/
typedef struct dissector_delete_item dissector_delete_item_t;
void
decode_build_reset_list (const gchar *table_name, ftenum_t selector_type,
gpointer key, gpointer value _U_,
gpointer user_data _U_)
{
dissector_delete_item_t *item;
item = g_new(dissector_delete_item_t,1);
item->ddi_table_name = table_name;
item->ddi_selector_type = selector_type;
switch (selector_type) {
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
item->ddi_selector.sel_uint = GPOINTER_TO_UINT(key);
break;
case FT_STRING:
case FT_STRINGZ:
item->ddi_selector.sel_string = (char *)key;
break;
default:
g_assert_not_reached();
}
dissector_reset_list = g_slist_prepend(dissector_reset_list, item);
}
/* clear all settings */
void
decode_clear_all(void)
{
dissector_delete_item_t *item;
GSList *tmp;
dissector_all_tables_foreach_changed(decode_build_reset_list, NULL);
for (tmp = dissector_reset_list; tmp; tmp = g_slist_next(tmp)) {
item = (dissector_delete_item_t *)tmp->data;
switch (item->ddi_selector_type) {
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
dissector_reset_uint(item->ddi_table_name,
item->ddi_selector.sel_uint);
break;
case FT_STRING:
case FT_STRINGZ:
dissector_reset_string(item->ddi_table_name,
item->ddi_selector.sel_string);
break;
default:
g_assert_not_reached();
}
g_free(item);
}
g_slist_free(dissector_reset_list);
dissector_reset_list = NULL;
decode_dcerpc_reset_all();
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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