skarg
454 lines
17 KiB
C
454 lines
17 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2005 Steve Karg
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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include "bits.h"
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#include "apdu.h"
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#include "bacdef.h"
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#include "bacdcode.h"
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#include "bacenum.h"
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#include "tsm.h"
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#include "dcc.h"
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#include "iam.h"
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/* a simple table for crossing the services supported */
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static BACNET_SERVICES_SUPPORTED
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confirmed_service_supported[MAX_BACNET_CONFIRMED_SERVICE] = {
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SERVICE_SUPPORTED_ACKNOWLEDGE_ALARM,
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SERVICE_SUPPORTED_CONFIRMED_COV_NOTIFICATION,
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SERVICE_SUPPORTED_CONFIRMED_EVENT_NOTIFICATION,
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SERVICE_SUPPORTED_GET_ALARM_SUMMARY,
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SERVICE_SUPPORTED_GET_ENROLLMENT_SUMMARY,
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SERVICE_SUPPORTED_SUBSCRIBE_COV,
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SERVICE_SUPPORTED_ATOMIC_READ_FILE,
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SERVICE_SUPPORTED_ATOMIC_WRITE_FILE,
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SERVICE_SUPPORTED_ADD_LIST_ELEMENT,
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SERVICE_SUPPORTED_REMOVE_LIST_ELEMENT,
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SERVICE_SUPPORTED_CREATE_OBJECT,
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SERVICE_SUPPORTED_DELETE_OBJECT,
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SERVICE_SUPPORTED_READ_PROPERTY,
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SERVICE_SUPPORTED_READ_PROPERTY_CONDITIONAL,
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SERVICE_SUPPORTED_READ_PROPERTY_MULTIPLE,
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SERVICE_SUPPORTED_WRITE_PROPERTY,
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SERVICE_SUPPORTED_WRITE_PROPERTY_MULTIPLE,
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SERVICE_SUPPORTED_DEVICE_COMMUNICATION_CONTROL,
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SERVICE_SUPPORTED_PRIVATE_TRANSFER,
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SERVICE_SUPPORTED_TEXT_MESSAGE,
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SERVICE_SUPPORTED_REINITIALIZE_DEVICE,
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SERVICE_SUPPORTED_VT_OPEN,
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SERVICE_SUPPORTED_VT_CLOSE,
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SERVICE_SUPPORTED_VT_DATA,
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SERVICE_SUPPORTED_AUTHENTICATE,
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SERVICE_SUPPORTED_REQUEST_KEY,
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SERVICE_SUPPORTED_READ_RANGE,
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SERVICE_SUPPORTED_LIFE_SAFETY_OPERATION,
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SERVICE_SUPPORTED_SUBSCRIBE_COV_PROPERTY,
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SERVICE_SUPPORTED_GET_EVENT_INFORMATION
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};
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/* a simple table for crossing the services supported */
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static BACNET_SERVICES_SUPPORTED
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unconfirmed_service_supported[MAX_BACNET_UNCONFIRMED_SERVICE] = {
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SERVICE_SUPPORTED_I_AM,
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SERVICE_SUPPORTED_I_HAVE,
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SERVICE_SUPPORTED_UNCONFIRMED_COV_NOTIFICATION,
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SERVICE_SUPPORTED_UNCONFIRMED_EVENT_NOTIFICATION,
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SERVICE_SUPPORTED_UNCONFIRMED_PRIVATE_TRANSFER,
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SERVICE_SUPPORTED_UNCONFIRMED_TEXT_MESSAGE,
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SERVICE_SUPPORTED_TIME_SYNCHRONIZATION,
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SERVICE_SUPPORTED_WHO_HAS,
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SERVICE_SUPPORTED_WHO_IS,
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SERVICE_SUPPORTED_UTC_TIME_SYNCHRONIZATION
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};
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/* Confirmed Function Handlers */
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/* If they are not set, they are handled by a reject message */
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static confirmed_function Confirmed_Function[MAX_BACNET_CONFIRMED_SERVICE];
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void apdu_set_confirmed_handler(BACNET_CONFIRMED_SERVICE service_choice,
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confirmed_function pFunction)
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{
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if (service_choice < MAX_BACNET_CONFIRMED_SERVICE)
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Confirmed_Function[service_choice] = pFunction;
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}
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/* Allow the APDU handler to automatically reject */
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static confirmed_function Unrecognized_Service_Handler;
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void apdu_set_unrecognized_service_handler_handler(confirmed_function
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pFunction)
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{
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Unrecognized_Service_Handler = pFunction;
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}
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/* Unconfirmed Function Handlers */
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/* If they are not set, they are not handled */
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static unconfirmed_function
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Unconfirmed_Function[MAX_BACNET_UNCONFIRMED_SERVICE] = {
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NULL
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};
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void apdu_set_unconfirmed_handler(BACNET_UNCONFIRMED_SERVICE
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service_choice, unconfirmed_function pFunction)
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{
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if (service_choice < MAX_BACNET_UNCONFIRMED_SERVICE)
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Unconfirmed_Function[service_choice] = pFunction;
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}
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bool apdu_service_supported(BACNET_SERVICES_SUPPORTED service_supported)
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{
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int i = 0;
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bool status = false;
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bool found = false;
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if (service_supported < MAX_BACNET_SERVICES_SUPPORTED) {
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/* is it a confirmed service? */
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for (i = 0; i < MAX_BACNET_CONFIRMED_SERVICE; i++) {
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if (confirmed_service_supported[i] == service_supported) {
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if (Confirmed_Function[i] != NULL)
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status = true;
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found = true;
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break;
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}
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}
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if (!found) {
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/* is it an unconfirmed service? */
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for (i = 0; i < MAX_BACNET_UNCONFIRMED_SERVICE; i++) {
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if (unconfirmed_service_supported[i] == service_supported) {
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if (Unconfirmed_Function[i] != NULL)
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status = true;
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break;
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}
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}
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}
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}
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return status;
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}
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/* Confirmed ACK Function Handlers */
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static void *Confirmed_ACK_Function[MAX_BACNET_CONFIRMED_SERVICE];
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void apdu_set_confirmed_simple_ack_handler(BACNET_CONFIRMED_SERVICE
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service_choice, confirmed_simple_ack_function pFunction)
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{
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switch (service_choice) {
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case SERVICE_CONFIRMED_ACKNOWLEDGE_ALARM:
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case SERVICE_CONFIRMED_COV_NOTIFICATION:
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case SERVICE_CONFIRMED_EVENT_NOTIFICATION:
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case SERVICE_CONFIRMED_SUBSCRIBE_COV:
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case SERVICE_CONFIRMED_SUBSCRIBE_COV_PROPERTY:
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case SERVICE_CONFIRMED_LIFE_SAFETY_OPERATION:
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/* Object Access Services */
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case SERVICE_CONFIRMED_ADD_LIST_ELEMENT:
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case SERVICE_CONFIRMED_REMOVE_LIST_ELEMENT:
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case SERVICE_CONFIRMED_DELETE_OBJECT:
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case SERVICE_CONFIRMED_WRITE_PROPERTY:
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case SERVICE_CONFIRMED_WRITE_PROPERTY_MULTIPLE:
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/* Remote Device Management Services */
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case SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL:
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case SERVICE_CONFIRMED_TEXT_MESSAGE:
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case SERVICE_CONFIRMED_REINITIALIZE_DEVICE:
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/* Virtual Terminal Services */
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case SERVICE_CONFIRMED_VT_CLOSE:
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/* Security Services */
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case SERVICE_CONFIRMED_REQUEST_KEY:
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Confirmed_ACK_Function[service_choice] = (void *) pFunction;
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break;
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default:
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break;
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}
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}
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void apdu_set_confirmed_ack_handler(BACNET_CONFIRMED_SERVICE
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service_choice, confirmed_ack_function pFunction)
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{
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switch (service_choice) {
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case SERVICE_CONFIRMED_GET_ALARM_SUMMARY:
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case SERVICE_CONFIRMED_GET_ENROLLMENT_SUMMARY:
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case SERVICE_CONFIRMED_GET_EVENT_INFORMATION:
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/* File Access Services */
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case SERVICE_CONFIRMED_ATOMIC_READ_FILE:
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case SERVICE_CONFIRMED_ATOMIC_WRITE_FILE:
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/* Object Access Services */
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case SERVICE_CONFIRMED_CREATE_OBJECT:
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case SERVICE_CONFIRMED_READ_PROPERTY:
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case SERVICE_CONFIRMED_READ_PROPERTY_CONDITIONAL:
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case SERVICE_CONFIRMED_READ_PROPERTY_MULTIPLE:
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case SERVICE_CONFIRMED_READ_RANGE:
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/* Remote Device Management Services */
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case SERVICE_CONFIRMED_PRIVATE_TRANSFER:
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/* Virtual Terminal Services */
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case SERVICE_CONFIRMED_VT_OPEN:
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case SERVICE_CONFIRMED_VT_DATA:
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/* Security Services */
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case SERVICE_CONFIRMED_AUTHENTICATE:
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Confirmed_ACK_Function[service_choice] = (void *) pFunction;
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break;
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default:
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break;
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}
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}
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static error_function Error_Function[MAX_BACNET_CONFIRMED_SERVICE];
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void apdu_set_error_handler(BACNET_CONFIRMED_SERVICE service_choice,
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error_function pFunction)
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{
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if (service_choice < MAX_BACNET_CONFIRMED_SERVICE)
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Error_Function[service_choice] = pFunction;
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}
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static abort_function Abort_Function;
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void apdu_set_abort_handler(abort_function pFunction)
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{
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Abort_Function = pFunction;
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}
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static reject_function Reject_Function;
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void apdu_set_reject_handler(reject_function pFunction)
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{
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Reject_Function = pFunction;
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}
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uint16_t apdu_decode_confirmed_service_request(uint8_t * apdu, /* APDU data */
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uint16_t apdu_len,
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BACNET_CONFIRMED_SERVICE_DATA * service_data,
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uint8_t * service_choice,
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uint8_t ** service_request, uint16_t * service_request_len)
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{
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uint16_t len = 0; /* counts where we are in PDU */
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service_data->segmented_message = (apdu[0] & BIT3) ? true : false;
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service_data->more_follows = (apdu[0] & BIT2) ? true : false;
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service_data->segmented_response_accepted =
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(apdu[0] & BIT1) ? true : false;
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service_data->max_segs = decode_max_segs(apdu[1]);
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service_data->max_resp = decode_max_apdu(apdu[1]);
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service_data->invoke_id = apdu[2];
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len = 3;
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if (service_data->segmented_message) {
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service_data->sequence_number = apdu[len++];
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service_data->proposed_window_number = apdu[len++];
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}
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*service_choice = apdu[len++];
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*service_request = &apdu[len];
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*service_request_len = apdu_len - len;
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return len;
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}
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void apdu_handler(BACNET_ADDRESS * src, uint8_t * apdu, /* APDU data */
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uint16_t apdu_len)
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{
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BACNET_CONFIRMED_SERVICE_DATA service_data = { 0 };
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BACNET_CONFIRMED_SERVICE_ACK_DATA service_ack_data = { 0 };
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uint8_t invoke_id = 0;
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uint8_t service_choice = 0;
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uint8_t *service_request = NULL;
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uint16_t service_request_len = 0;
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uint16_t len = 0; /* counts where we are in PDU */
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uint8_t tag_number = 0;
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uint32_t len_value = 0;
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int error_code = 0;
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int error_class = 0;
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uint8_t reason = 0;
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if (apdu) {
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/* PDU Type */
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switch (apdu[0] & 0xF0) {
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case PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
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len = apdu_decode_confirmed_service_request(&apdu[0], /* APDU data */
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apdu_len,
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&service_data,
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&service_choice, &service_request, &service_request_len);
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/* When network communications are completely disabled,
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only DeviceCommunicationControl and ReinitializeDevice APDUs
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shall be processed and no messages shall be initiated. */
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if (dcc_communication_disabled() &&
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((service_choice !=
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SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL)
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&& (service_choice !=
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SERVICE_CONFIRMED_REINITIALIZE_DEVICE)))
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break;
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if ((service_choice < MAX_BACNET_CONFIRMED_SERVICE) &&
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(Confirmed_Function[service_choice]))
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Confirmed_Function[service_choice] (service_request,
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service_request_len, src, &service_data);
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else if (Unrecognized_Service_Handler)
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Unrecognized_Service_Handler(service_request,
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service_request_len, src, &service_data);
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break;
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case PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST:
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if (dcc_communication_disabled())
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break;
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service_choice = apdu[1];
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service_request = &apdu[2];
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service_request_len = apdu_len - 2;
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if (service_choice < MAX_BACNET_UNCONFIRMED_SERVICE) {
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if (Unconfirmed_Function[service_choice])
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Unconfirmed_Function[service_choice] (service_request,
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service_request_len, src);
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}
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break;
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case PDU_TYPE_SIMPLE_ACK:
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invoke_id = apdu[1];
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service_choice = apdu[2];
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switch (service_choice) {
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case SERVICE_CONFIRMED_ACKNOWLEDGE_ALARM:
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case SERVICE_CONFIRMED_COV_NOTIFICATION:
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case SERVICE_CONFIRMED_EVENT_NOTIFICATION:
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case SERVICE_CONFIRMED_SUBSCRIBE_COV:
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case SERVICE_CONFIRMED_SUBSCRIBE_COV_PROPERTY:
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case SERVICE_CONFIRMED_LIFE_SAFETY_OPERATION:
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/* Object Access Services */
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case SERVICE_CONFIRMED_ADD_LIST_ELEMENT:
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case SERVICE_CONFIRMED_REMOVE_LIST_ELEMENT:
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case SERVICE_CONFIRMED_DELETE_OBJECT:
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case SERVICE_CONFIRMED_WRITE_PROPERTY:
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case SERVICE_CONFIRMED_WRITE_PROPERTY_MULTIPLE:
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/* Remote Device Management Services */
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case SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL:
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case SERVICE_CONFIRMED_REINITIALIZE_DEVICE:
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case SERVICE_CONFIRMED_TEXT_MESSAGE:
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/* Virtual Terminal Services */
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case SERVICE_CONFIRMED_VT_CLOSE:
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/* Security Services */
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case SERVICE_CONFIRMED_REQUEST_KEY:
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if (Confirmed_ACK_Function[service_choice]) {
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((confirmed_simple_ack_function)
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Confirmed_ACK_Function[service_choice]) (src,
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invoke_id);
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}
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tsm_free_invoke_id(invoke_id);
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break;
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default:
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break;
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}
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break;
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case PDU_TYPE_COMPLEX_ACK:
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service_ack_data.segmented_message =
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(apdu[0] & BIT3) ? true : false;
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service_ack_data.more_follows =
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(apdu[0] & BIT2) ? true : false;
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invoke_id = service_ack_data.invoke_id = apdu[1];
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len = 2;
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if (service_ack_data.segmented_message) {
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service_ack_data.sequence_number = apdu[len++];
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service_ack_data.proposed_window_number = apdu[len++];
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}
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service_choice = apdu[len++];
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service_request = &apdu[len];
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service_request_len = apdu_len - len;
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switch (service_choice) {
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case SERVICE_CONFIRMED_GET_ALARM_SUMMARY:
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case SERVICE_CONFIRMED_GET_ENROLLMENT_SUMMARY:
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case SERVICE_CONFIRMED_GET_EVENT_INFORMATION:
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/* File Access Services */
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case SERVICE_CONFIRMED_ATOMIC_READ_FILE:
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case SERVICE_CONFIRMED_ATOMIC_WRITE_FILE:
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/* Object Access Services */
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case SERVICE_CONFIRMED_CREATE_OBJECT:
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case SERVICE_CONFIRMED_READ_PROPERTY:
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case SERVICE_CONFIRMED_READ_PROPERTY_CONDITIONAL:
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case SERVICE_CONFIRMED_READ_PROPERTY_MULTIPLE:
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case SERVICE_CONFIRMED_READ_RANGE:
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case SERVICE_CONFIRMED_PRIVATE_TRANSFER:
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/* Virtual Terminal Services */
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case SERVICE_CONFIRMED_VT_OPEN:
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case SERVICE_CONFIRMED_VT_DATA:
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/* Security Services */
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case SERVICE_CONFIRMED_AUTHENTICATE:
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if (Confirmed_ACK_Function[service_choice]) {
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((confirmed_ack_function)
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Confirmed_ACK_Function[service_choice])
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(service_request, service_request_len, src,
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&service_ack_data);
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}
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tsm_free_invoke_id(invoke_id);
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break;
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default:
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break;
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}
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break;
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case PDU_TYPE_SEGMENT_ACK:
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/* FIXME: what about a denial of service attack here?
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we could check src to see if that matched the tsm */
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tsm_free_invoke_id(invoke_id);
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break;
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case PDU_TYPE_ERROR:
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invoke_id = apdu[1];
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service_choice = apdu[2];
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len = 3;
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number,
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&len_value);
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/* FIXME: we could validate that the tag is enumerated... */
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len += decode_enumerated(&apdu[len], len_value, &error_class);
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number,
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&len_value);
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/* FIXME: we could validate that the tag is enumerated... */
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len += decode_enumerated(&apdu[len], len_value, &error_code);
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if (service_choice < MAX_BACNET_CONFIRMED_SERVICE) {
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if (Error_Function[service_choice])
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Error_Function[service_choice] (src,
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invoke_id, error_class, error_code);
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}
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tsm_free_invoke_id(invoke_id);
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break;
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case PDU_TYPE_REJECT:
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invoke_id = apdu[1];
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reason = apdu[2];
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if (Reject_Function)
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Reject_Function(src, invoke_id, reason);
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tsm_free_invoke_id(invoke_id);
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break;
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case PDU_TYPE_ABORT:
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invoke_id = apdu[1];
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reason = apdu[2];
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if (Abort_Function)
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Abort_Function(src, invoke_id, reason);
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tsm_free_invoke_id(invoke_id);
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break;
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default:
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break;
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}
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}
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return;
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}
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