mirror of
https://github.com/stargieg/bacnet-stack
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242 lines
7.3 KiB
C
242 lines
7.3 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 <stdint.h>
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#include "bacenum.h"
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#include "bacdcode.h"
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#include "bacdef.h"
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#include "whois.h"
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/** @file whois.c Encode/Decode Who-Is requests */
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/* encode I-Am service - use -1 for limit if you want unlimited */
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int whois_encode_apdu(
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uint8_t * apdu,
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int32_t low_limit,
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int32_t high_limit)
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{
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int len = 0; /* length of each encoding */
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int apdu_len = 0; /* total length of the apdu, return value */
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if (apdu) {
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apdu[0] = PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST;
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apdu[1] = SERVICE_UNCONFIRMED_WHO_IS; /* service choice */
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apdu_len = 2;
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/* optional limits - must be used as a pair */
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if ((low_limit >= 0) && (low_limit <= BACNET_MAX_INSTANCE) &&
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(high_limit >= 0) && (high_limit <= BACNET_MAX_INSTANCE)) {
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len = encode_context_unsigned(&apdu[apdu_len], 0, low_limit);
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apdu_len += len;
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len = encode_context_unsigned(&apdu[apdu_len], 1, high_limit);
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apdu_len += len;
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}
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}
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return apdu_len;
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}
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/* decode the service request only */
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int whois_decode_service_request(
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uint8_t * apdu,
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unsigned apdu_len,
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int32_t * pLow_limit,
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int32_t * pHigh_limit)
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{
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unsigned int len = 0;
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uint8_t tag_number = 0;
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uint32_t len_value = 0;
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uint32_t decoded_value = 0;
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/* optional limits - must be used as a pair */
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if (apdu_len) {
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number, &len_value);
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if (tag_number != 0) {
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return BACNET_STATUS_ERROR;
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}
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if (apdu_len > (unsigned)len) {
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len += decode_unsigned(&apdu[len], len_value, &decoded_value);
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if (decoded_value <= BACNET_MAX_INSTANCE) {
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if (pLow_limit) {
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*pLow_limit = decoded_value;
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}
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}
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if (apdu_len > (unsigned)len) {
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len +=
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decode_tag_number_and_value(&apdu[len], &tag_number, &len_value);
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if (tag_number != 1) {
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return BACNET_STATUS_ERROR;
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}
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if (apdu_len > (unsigned)len) {
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len += decode_unsigned(&apdu[len], len_value, &decoded_value);
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if (decoded_value <= BACNET_MAX_INSTANCE) {
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if (pHigh_limit) {
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*pHigh_limit = decoded_value;
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}
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}
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} else {
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return BACNET_STATUS_ERROR;
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}
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} else {
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return BACNET_STATUS_ERROR;
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}
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} else {
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return BACNET_STATUS_ERROR;
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}
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} else {
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if (pLow_limit) {
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*pLow_limit = -1;
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}
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if (pHigh_limit) {
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*pHigh_limit = -1;
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}
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len = 0;
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}
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return (int)len;
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}
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#ifdef TEST
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#include <assert.h>
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#include <string.h>
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#include "ctest.h"
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int whois_decode_apdu(
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uint8_t * apdu,
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unsigned apdu_len,
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int32_t * pLow_limit,
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int32_t * pHigh_limit)
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{
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int len = 0;
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if (!apdu) {
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return BACNET_STATUS_ERROR;
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}
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/* optional limits - must be used as a pair */
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if (apdu_len >= 2) {
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/* optional checking - most likely was already done prior to this call */
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if (apdu[0] != PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST) {
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return BACNET_STATUS_ERROR;
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}
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if (apdu[1] != SERVICE_UNCONFIRMED_WHO_IS) {
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return BACNET_STATUS_ERROR;
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}
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len =
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whois_decode_service_request(&apdu[2], apdu_len - 2, pLow_limit,
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pHigh_limit);
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}
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return len;
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}
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void testWhoIs(
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Test * pTest)
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{
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uint8_t apdu[480] = { 0 };
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int len = 0;
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int apdu_len = 0;
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int32_t low_limit = -1;
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int32_t high_limit = -1;
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int32_t test_low_limit = 0;
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int32_t test_high_limit = 0;
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/* normal who-is without limits */
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len = whois_encode_apdu(&apdu[0], low_limit, high_limit);
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ct_test(pTest, len > 0);
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apdu_len = len;
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len =
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whois_decode_apdu(&apdu[0], apdu_len, &test_low_limit,
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&test_high_limit);
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ct_test(pTest, len != BACNET_STATUS_ERROR);
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ct_test(pTest, test_low_limit == low_limit);
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ct_test(pTest, test_high_limit == high_limit);
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/* normal who-is with limits - complete range */
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for (low_limit = 0; low_limit <= BACNET_MAX_INSTANCE;
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low_limit += (BACNET_MAX_INSTANCE / 4)) {
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for (high_limit = 0; high_limit <= BACNET_MAX_INSTANCE;
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high_limit += (BACNET_MAX_INSTANCE / 4)) {
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len = whois_encode_apdu(&apdu[0], low_limit, high_limit);
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apdu_len = len;
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ct_test(pTest, len > 0);
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len =
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whois_decode_apdu(&apdu[0], apdu_len, &test_low_limit,
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&test_high_limit);
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ct_test(pTest, len != BACNET_STATUS_ERROR);
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ct_test(pTest, test_low_limit == low_limit);
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ct_test(pTest, test_high_limit == high_limit);
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}
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}
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/* abnormal case:
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who-is with no limits, but with APDU containing 2 limits */
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low_limit = 0;
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high_limit = 0;
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len = whois_encode_apdu(&apdu[0], low_limit, high_limit);
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ct_test(pTest, len > 0);
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apdu_len = len;
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low_limit = -1;
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high_limit = -1;
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len = whois_encode_apdu(&apdu[0], low_limit, high_limit);
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ct_test(pTest, len > 0);
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apdu_len = len;
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len =
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whois_decode_apdu(&apdu[0], apdu_len, &test_low_limit,
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&test_high_limit);
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ct_test(pTest, len != BACNET_STATUS_ERROR);
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ct_test(pTest, test_low_limit == low_limit);
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ct_test(pTest, test_high_limit == high_limit);
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}
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#ifdef TEST_WHOIS
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int main(
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void)
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{
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Test *pTest;
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bool rc;
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pTest = ct_create("BACnet Who-Is", NULL);
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/* individual tests */
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rc = ct_addTestFunction(pTest, testWhoIs);
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assert(rc);
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ct_setStream(pTest, stdout);
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ct_run(pTest);
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(void) ct_report(pTest);
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ct_destroy(pTest);
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return 0;
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}
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#endif /* TEST_WHOIS */
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#endif /* TEST */
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