forked from osmocom/wireshark
![Alexis La Goutte](/assets/img/avatar_default.png)
false positive Change-Id: I8aa2537328a04a64b06142a04ee76705d0df5443 Reviewed-on: https://code.wireshark.org/review/21566 Reviewed-by: Michael Mann <mmann78@netscape.net>
534 lines
18 KiB
C
534 lines
18 KiB
C
/* packet-udp-nm.c
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* UDP-NM Dissector
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* By Dr. Lars Voelker <lars.voelker@bmw.de>
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* Copyright 2014-2017 Dr. Lars Voelker, BMW
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* UDP-NM is an automotive communication protocol as standardized by
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* AUTOSAR (www.autosar.org) and is specified in AUTOSAR_SWS_UDPNetworkManagement.pdf,
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* which can be accessed on:
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* autosar.org -> Classic Platform -> Software Arch -> Comm Stack.
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*/
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#include <config.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/uat.h>
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void proto_reg_handoff_udp_nm(void);
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void proto_register_udp_nm(void);
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typedef struct _user_data_field_t {
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gchar* udf_name;
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gchar* udf_desc;
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guint32 udf_offset;
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guint32 udf_length;
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guint32 udf_mask;
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gchar* udf_value_desc;
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} user_data_field_t;
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static int proto_udp_nm = -1;
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/*** header fields ***/
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static int hf_udp_nm_source_node_identifier = -1;
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static int hf_udp_nm_control_bit_vector = -1;
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static int hf_udp_nm_control_bit_vector_repeat_msg_req = -1;
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static int hf_udp_nm_control_bit_vector_nm_coord_sleep = -1;
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static int hf_udp_nm_control_bit_vector_active_wakeup = -1;
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static int hf_udp_nm_control_bit_vector_pni = -1;
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static int hf_udp_nm_user_data = -1;
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/*** protocol tree items ***/
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static gint ett_udp_nm = -1;
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static gint ett_udp_nm_cbv = -1;
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static gint ett_udp_nm_user_data = -1;
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/*** Bit meanings ***/
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static const true_false_string tfs_udp_nm_control_rep_msg_req = {
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"Repeat Message State requested", "Repeat Message State not requested" };
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static const true_false_string tfs_udp_nm_control_sleep_bit = {
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"Start of synchronized shutdown requested", "Start of synchronized shutdown not requested" };
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static const true_false_string tfs_udp_nm_control_active_wakeup = {
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"Node has woken up the network", "Node has not woken up the network" };
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static const true_false_string tfs_udp_nm_control_pni = {
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"NM message contains no Partial Network request information", "NM message contains Partial Network request information" };
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/*** Configuration items ***/
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/* Set the order of the first two fields (Source Node Identifier and Control Bit Vector */
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static gboolean g_udp_nm_swap_first_fields = TRUE;
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/*******************************
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****** User data fields ******
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*******************************/
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/*** stolen from the HTTP disector ;-) ***/
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static user_data_field_t* user_data_fields = NULL;
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static guint num_user_data_fields = 0;
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static GHashTable* user_data_fields_hash_hf = NULL;
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static GHashTable* user_data_fields_hash_ett = NULL;
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static gboolean
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user_data_fields_update_cb(void *r, char **err)
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{
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user_data_field_t *rec = (user_data_field_t *)r;
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char c;
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*err = NULL;
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if (rec->udf_length == 0) {
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*err = g_strdup_printf("length of user data field can't be 0 Bytes (name: %s offset: %i length: %i)", rec->udf_name, rec->udf_offset, rec->udf_length);
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return (*err == NULL);
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}
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if (rec->udf_length > 4) {
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*err = g_strdup_printf("length of user data field can't be greater 4 Bytes (name: %s offset: %i length: %i)", rec->udf_name, rec->udf_offset, rec->udf_length);
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return (*err == NULL);
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}
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if (rec->udf_offset < 2) {
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*err = g_strdup_printf("offset of user data field can't be short than 2 (name: %s offset: %i length: %i)", rec->udf_name, rec->udf_offset, rec->udf_length);
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return (*err == NULL);
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}
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if (rec->udf_mask >= G_MAXUINT32) {
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*err = g_strdup_printf("mask can only be up to 32bits (name: %s)", rec->udf_name);
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return (*err == NULL);
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}
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if (rec->udf_name == NULL) {
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*err = g_strdup_printf("Name of user data field can't be empty");
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return (*err == NULL);
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}
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g_strstrip(rec->udf_name);
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if (rec->udf_name[0] == 0) {
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*err = g_strdup_printf("Name of user data field can't be empty");
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return (*err == NULL);
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}
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/* Check for invalid characters (to avoid asserting out when
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* registering the field).
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*/
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c = proto_check_field_name(rec->udf_name);
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if (c) {
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*err = g_strdup_printf("Name of user data field can't contain '%c'", c);
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return (*err == NULL);
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}
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return (*err == NULL);
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}
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static void *
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user_data_fields_copy_cb(void* n, const void* o, size_t siz _U_)
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{
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user_data_field_t* new_rec = (user_data_field_t*)n;
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const user_data_field_t* old_rec = (const user_data_field_t*)o;
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if (old_rec->udf_name) {
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new_rec->udf_name = g_strdup(old_rec->udf_name);
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}
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else {
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new_rec->udf_name = NULL;
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}
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if (old_rec->udf_desc) {
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new_rec->udf_desc = g_strdup(old_rec->udf_desc);
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}
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else {
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new_rec->udf_desc = NULL;
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}
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new_rec->udf_offset = old_rec->udf_offset;
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new_rec->udf_length = old_rec->udf_length;
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new_rec->udf_mask = old_rec->udf_mask;
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if (old_rec->udf_value_desc) {
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new_rec->udf_value_desc = g_strdup(old_rec->udf_value_desc);
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}
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else {
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new_rec->udf_value_desc = NULL;
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}
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return new_rec;
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}
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static void
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user_data_fields_free_cb(void*r)
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{
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user_data_field_t* rec = (user_data_field_t*)r;
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if (rec->udf_name) g_free(rec->udf_name);
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if (rec->udf_desc) g_free(rec->udf_desc);
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if (rec->udf_value_desc) g_free(rec->udf_value_desc);
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}
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UAT_CSTRING_CB_DEF(user_data_fields, udf_name, user_data_field_t)
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UAT_CSTRING_CB_DEF(user_data_fields, udf_desc, user_data_field_t)
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UAT_DEC_CB_DEF(user_data_fields, udf_offset, user_data_field_t)
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UAT_DEC_CB_DEF(user_data_fields, udf_length, user_data_field_t)
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UAT_HEX_CB_DEF(user_data_fields, udf_mask, user_data_field_t)
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UAT_CSTRING_CB_DEF(user_data_fields, udf_value_desc, user_data_field_t)
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static guint64
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calc_ett_key(guint32 offset, guint32 length)
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{
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guint64 ret = offset;
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return (ret * 0x100000000) ^ length;
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}
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/*
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* This creates a string for you that can be used as key for the hash table.
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* YOU must g_free that string!
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*/
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static gchar*
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calc_hf_key(user_data_field_t udf)
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{
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gchar* ret = NULL;
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ret = g_strdup_printf("%i-%i-%i-%s", udf.udf_offset, udf.udf_length, udf.udf_mask, udf.udf_name);
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return ret;
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}
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/*
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*
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*/
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static gint*
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get_hf_for_user_data(gchar* key)
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{
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gint* hf_id = NULL;
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if (user_data_fields_hash_hf) {
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hf_id = (gint*)g_hash_table_lookup(user_data_fields_hash_hf, key);
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}
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else {
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hf_id = NULL;
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}
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return hf_id;
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}
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/*
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*
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*/
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static gint*
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get_ett_for_user_data(guint32 offset, guint32 length)
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{
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gint* ett_id = NULL;
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guint64 key = calc_ett_key(offset, length);
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if (user_data_fields_hash_ett) {
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ett_id = (gint*)g_hash_table_lookup(user_data_fields_hash_ett, &key);
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}
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else {
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ett_id = NULL;
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}
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return ett_id;
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}
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/*
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*
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*/
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static void
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user_data_post_update_cb(void)
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{
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static hf_register_info* hf;
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gint* hf_id;
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guint i;
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//gchar* udf_name;
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gchar* tmp = NULL;
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guint64* key = NULL;
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static gint ett_dummy = -1;
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static gint *ett[] = {
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&ett_dummy,
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};
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static gint *ett_id;
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if (user_data_fields_hash_hf && hf) {
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guint hf_size = g_hash_table_size(user_data_fields_hash_hf);
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/* Unregister all fields */
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for (i = 0; i < hf_size; i++) {
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proto_deregister_field(proto_udp_nm, *(hf[i].p_id));
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}
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g_hash_table_destroy(user_data_fields_hash_hf);
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user_data_fields_hash_hf = NULL;
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}
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// we cannot unregister ETTs, so we should try to limit the damage of an update
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if (num_user_data_fields) {
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user_data_fields_hash_hf = g_hash_table_new(g_str_hash, g_str_equal);
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hf = g_new0(hf_register_info, num_user_data_fields);
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if (user_data_fields_hash_ett == NULL) {
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user_data_fields_hash_ett = g_hash_table_new(g_int64_hash, g_int64_equal);
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}
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for (i = 0; i < num_user_data_fields; i++) {
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hf_id = g_new(gint, 1);
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*hf_id = -1;
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hf[i].p_id = hf_id;
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hf[i].hfinfo.strings = NULL;
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hf[i].hfinfo.bitmask = user_data_fields[i].udf_mask;
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hf[i].hfinfo.same_name_next = NULL;
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hf[i].hfinfo.same_name_prev_id = -1;
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if (user_data_fields[i].udf_mask == 0 || user_data_fields[i].udf_length <= 0 || user_data_fields[i].udf_length>4) {
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hf[i].hfinfo.name = g_strdup(user_data_fields[i].udf_name);
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hf[i].hfinfo.abbrev = g_strdup_printf("nm.user_data.%s", user_data_fields[i].udf_name);
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hf[i].hfinfo.type = FT_BYTES;
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hf[i].hfinfo.display = BASE_NONE;
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hf[i].hfinfo.bitmask = 0;
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hf[i].hfinfo.blurb = g_strdup(user_data_fields[i].udf_desc);
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}
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else {
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hf[i].hfinfo.name = g_strdup(user_data_fields[i].udf_value_desc);
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hf[i].hfinfo.abbrev = g_strdup_printf("nm.user_data.%s.%s", user_data_fields[i].udf_name, user_data_fields[i].udf_value_desc);
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hf[i].hfinfo.type = FT_BOOLEAN;
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hf[i].hfinfo.display = 8 * (user_data_fields[i].udf_length);
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// hf[i].hfinfo.bitmask = 0;
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hf[i].hfinfo.blurb = g_strdup(user_data_fields[i].udf_value_desc);
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}
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tmp = calc_hf_key(user_data_fields[i]);
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g_hash_table_insert(user_data_fields_hash_hf, tmp, hf_id);
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// generate etts for new fields only
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if (get_ett_for_user_data(user_data_fields[i].udf_offset, user_data_fields[i].udf_length) == NULL) {
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ett_dummy = -1;
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proto_register_subtree_array(ett, array_length(ett));
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ett_id = g_new(gint, 1);
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*ett_id = ett_dummy;
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key = g_new(guint64, 1);
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*key = calc_ett_key(user_data_fields[i].udf_offset, user_data_fields[i].udf_length);
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g_hash_table_insert(user_data_fields_hash_ett, key, ett_id);
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}
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}
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proto_register_field_array(proto_udp_nm, hf, num_user_data_fields);
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}
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}
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/**********************************
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****** The dissector itself ******
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**********************************/
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static int
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dissect_udp_nm(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
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{
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proto_item *ti;
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proto_tree *udp_nm_tree;
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proto_tree *udp_nm_subtree = NULL;
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gchar* tmp = NULL;
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guint32 offset = 0;
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guint32 length = 0;
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guint32 msg_length = 0;
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guint32 ctrl_bit_vector;
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guint32 src_node_id = 0;
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guint i = 0;
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int* hf_id;
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int ett_id;
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// AUTOSAR says default is Source Node ID first and Ctrl Bit Vector second but this can be also swapped
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guint32 offset_ctrl_bit_vector = 1;
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guint32 offset_src_node_id = 0;
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static const int * control_bits[] = {
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&hf_udp_nm_control_bit_vector_repeat_msg_req,
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&hf_udp_nm_control_bit_vector_nm_coord_sleep,
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&hf_udp_nm_control_bit_vector_active_wakeup,
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&hf_udp_nm_control_bit_vector_pni,
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NULL
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};
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if (g_udp_nm_swap_first_fields == TRUE) {
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offset_ctrl_bit_vector = 0;
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offset_src_node_id = 1;
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "NM");
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col_clear(pinfo->cinfo, COL_INFO);
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msg_length = tvb_reported_length(tvb);
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ti = proto_tree_add_item(tree, proto_udp_nm, tvb, 0, -1, ENC_NA);
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udp_nm_tree = proto_item_add_subtree(ti, ett_udp_nm);
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if (g_udp_nm_swap_first_fields == FALSE) {
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proto_tree_add_item_ret_uint(udp_nm_tree, hf_udp_nm_source_node_identifier, tvb, offset_src_node_id, 1, ENC_BIG_ENDIAN, &src_node_id);
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}
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proto_tree_add_bitmask(udp_nm_tree, tvb, offset_ctrl_bit_vector, hf_udp_nm_control_bit_vector, ett_udp_nm_cbv, control_bits, ENC_BIG_ENDIAN);
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ctrl_bit_vector = tvb_get_guint8(tvb, offset_ctrl_bit_vector);
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if (g_udp_nm_swap_first_fields == TRUE) {
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proto_tree_add_item_ret_uint(udp_nm_tree, hf_udp_nm_source_node_identifier, tvb, offset_src_node_id, 1, ENC_BIG_ENDIAN, &src_node_id);
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}
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col_add_fstr(pinfo->cinfo, COL_INFO, "Control Bit Vector: 0x%02x, Source Node: 0x%02x", ctrl_bit_vector, src_node_id);
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proto_item_append_text(ti, ", Control Bit Vector: 0x%02x, Source Node: %i", ctrl_bit_vector, src_node_id);
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offset = 2;
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/* now we need to process the user defined fields ... */
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ti = proto_tree_add_item(udp_nm_tree, hf_udp_nm_user_data, tvb, offset, msg_length - offset, ENC_NA);
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udp_nm_tree = proto_item_add_subtree(ti, ett_udp_nm_user_data);
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for (i = 0; i < num_user_data_fields; i++) {
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tmp = calc_hf_key(user_data_fields[i]);
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hf_id = get_hf_for_user_data(tmp);
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offset = user_data_fields[i].udf_offset;
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length = user_data_fields[i].udf_length;
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ett_id = *(get_ett_for_user_data(offset, length));
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if (hf_id && msg_length >= length + offset) {
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if (user_data_fields[i].udf_mask == 0) {
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ti = proto_tree_add_item(udp_nm_tree, *hf_id, tvb, offset, length, ENC_BIG_ENDIAN);
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udp_nm_subtree = proto_item_add_subtree(ti, ett_id);
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}
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else {
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if (udp_nm_subtree != NULL) {
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proto_tree_add_item(udp_nm_subtree, *hf_id, tvb, offset, length, ENC_BIG_ENDIAN);
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}
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}
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}
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else {
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/* should we warn? */
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}
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g_free(tmp);
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}
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return 8;
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}
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void proto_register_udp_nm(void)
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{
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module_t *udp_nm_module;
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uat_t* user_data_fields_uat;
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static hf_register_info hf_udp_nm[] = {
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{ &hf_udp_nm_control_bit_vector,
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{ "Control Bit Vector", "nm.ctrl", FT_UINT8, BASE_HEX, NULL, 0x0, "The Control Bit Vector", HFILL } },
|
|
{ &hf_udp_nm_control_bit_vector_repeat_msg_req,
|
|
{ "Repeat Message Request", "nm.ctrl.repeat_msg_req", FT_BOOLEAN, 8, TFS(&tfs_udp_nm_control_rep_msg_req), 0x01, "The Repeat Message Request Bit", HFILL } },
|
|
{ &hf_udp_nm_control_bit_vector_nm_coord_sleep,
|
|
{ "NM Coordinator Sleep", "nm.ctrl.nm_coord_sleep", FT_BOOLEAN, 8, TFS(&tfs_udp_nm_control_sleep_bit), 0x08, "NM Coordinator Sleep Bit", HFILL } },
|
|
{ &hf_udp_nm_control_bit_vector_active_wakeup,
|
|
{ "Active Wakeup", "nm.ctrl.active_wakeup", FT_BOOLEAN, 8, TFS(&tfs_udp_nm_control_active_wakeup), 0x10, "Active Wakeup Bit", HFILL } },
|
|
{ &hf_udp_nm_control_bit_vector_pni,
|
|
{ "Partial Network Information", "nm.ctrl.pni", FT_BOOLEAN, 8, TFS(&tfs_udp_nm_control_pni), 0x40, "Partial Network Information Bit", HFILL } },
|
|
|
|
{ &hf_udp_nm_source_node_identifier,
|
|
{ "Source Node Identifier", "nm.src", FT_UINT8, BASE_DEC, NULL, 0x0, "The identification of the sending node", HFILL } },
|
|
|
|
{ &hf_udp_nm_user_data,
|
|
{ "User Data", "nm.user_data", FT_BYTES, BASE_NONE, NULL, 0x0, "The User Data", HFILL } },
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_udp_nm,
|
|
&ett_udp_nm_cbv,
|
|
&ett_udp_nm_user_data,
|
|
};
|
|
|
|
/* UAT for user_data fields */
|
|
static uat_field_t user_data_uat_fields[] = {
|
|
UAT_FLD_CSTRING(user_data_fields, udf_name, "User data name", "Name of user data field"),
|
|
UAT_FLD_CSTRING(user_data_fields, udf_desc, "User data desc", "Description of user data field"),
|
|
UAT_FLD_DEC(user_data_fields, udf_offset, "User data offset", "Offset of the user data field in the UDP-NM message (uint32)"),
|
|
UAT_FLD_DEC(user_data_fields, udf_length, "User data length", "Length of the user data field in the UDP-NM message (uint32)"),
|
|
UAT_FLD_DEC(user_data_fields, udf_mask, "User data mask", "Relevant bits of the user data field in the UDP-NM message (uint32)"),
|
|
UAT_FLD_CSTRING(user_data_fields, udf_value_desc, "User data value", "Description what the masked bits mean"),
|
|
UAT_END_FIELDS
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_udp_nm = proto_register_protocol("Network Management", "NM", "nm");
|
|
proto_register_field_array(proto_udp_nm, hf_udp_nm, array_length(hf_udp_nm));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* Register configuration options */
|
|
udp_nm_module = prefs_register_protocol(proto_udp_nm, NULL);
|
|
prefs_register_bool_preference(udp_nm_module, "swap_ctrl_and_src",
|
|
"Swap Source Node Identifier and Control Bit Vector",
|
|
"In the standard the Source Node Identifier is the first byte "
|
|
"and the Control Bit Vector is the second byte. "
|
|
"Using this parameter they can be swapped",
|
|
&g_udp_nm_swap_first_fields);
|
|
|
|
/* UAT */
|
|
user_data_fields_uat = uat_new("NM User Data Fields Table",
|
|
sizeof(user_data_field_t), /* record size */
|
|
"NM_user_data_fields", /* filename */
|
|
TRUE, /* from_profile */
|
|
&user_data_fields, /* data_ptr */
|
|
&num_user_data_fields, /* numitems_ptr */
|
|
UAT_AFFECTS_DISSECTION | UAT_AFFECTS_FIELDS, /* specifies named fields, so affects dissection and the set of named fields */
|
|
NULL, /* help */
|
|
user_data_fields_copy_cb, /* copy callback */
|
|
user_data_fields_update_cb, /* update callback */
|
|
user_data_fields_free_cb, /* free callback */
|
|
user_data_post_update_cb, /* post update callback */
|
|
NULL, /* reset callback */
|
|
user_data_uat_fields); /* UAT field definitions */
|
|
|
|
prefs_register_uat_preference(udp_nm_module, "udp_nm_user_data_fields", "User Data Field Configuration",
|
|
"A table to define user defined fields in the NM payload",
|
|
user_data_fields_uat);
|
|
}
|
|
|
|
void proto_reg_handoff_udp_nm(void)
|
|
{
|
|
dissector_handle_t nm_handle = create_dissector_handle(dissect_udp_nm, proto_udp_nm);
|
|
|
|
dissector_add_for_decode_as_with_preference("udp.port", nm_handle);
|
|
dissector_add_for_decode_as("can.subdissector", nm_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|