skarg
334 lines
8.1 KiB
C
Executable File
334 lines
8.1 KiB
C
Executable File
/*####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 "bacdef.h"
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#include "npdu.h"
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#include "datalink.h"
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#include "device.h"
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#include "bacdcode.h"
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#include "address.h"
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// encode I-Am service
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int iam_encode_apdu(
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uint8_t *apdu,
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uint32_t device_id,
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unsigned max_apdu,
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int segmentation,
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uint16_t vendor_id)
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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_I_AM; // service choice
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apdu_len = 2;
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len = encode_tagged_object_id(
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&apdu[apdu_len],
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OBJECT_DEVICE,
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device_id);
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apdu_len += len;
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len = encode_tagged_unsigned(
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&apdu[apdu_len],
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max_apdu);
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apdu_len += len;
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len = encode_tagged_enumerated(
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&apdu[apdu_len],
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segmentation);
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apdu_len += len;
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len = encode_tagged_unsigned(
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&apdu[apdu_len],
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vendor_id);
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apdu_len += len;
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}
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return apdu_len;
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}
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int iam_decode_service_request(
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uint8_t *apdu,
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uint32_t *pDevice_id,
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unsigned *pMax_apdu,
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int *pSegmentation,
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uint16_t *pVendor_id)
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{
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int len = 0;
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int apdu_len = 0; // total length of the apdu, return value
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int object_type = 0; // should be a Device Object
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uint32_t object_instance = 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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int decoded_integer = 0;
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// OBJECT ID - object id
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len = decode_tag_number_and_value(&apdu[apdu_len], &tag_number, &len_value);
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apdu_len += len;
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if (tag_number != BACNET_APPLICATION_TAG_OBJECT_ID)
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return -1;
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len = decode_object_id(&apdu[apdu_len], &object_type, &object_instance);
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apdu_len += len;
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if (object_type != OBJECT_DEVICE)
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return -1;
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if (pDevice_id)
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*pDevice_id = object_instance;
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// MAX APDU - unsigned
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len = decode_tag_number_and_value(&apdu[apdu_len], &tag_number, &len_value);
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apdu_len += len;
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if (tag_number != BACNET_APPLICATION_TAG_UNSIGNED_INT)
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return -1;
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len = decode_unsigned(&apdu[apdu_len], len_value, &decoded_value);
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apdu_len += len;
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if (pMax_apdu)
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*pMax_apdu = decoded_value;
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// Segmentation - enumerated
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len = decode_tag_number_and_value(&apdu[apdu_len], &tag_number, &len_value);
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apdu_len += len;
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if (tag_number != BACNET_APPLICATION_TAG_ENUMERATED)
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return -1;
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len = decode_enumerated(&apdu[apdu_len],len_value, &decoded_integer);
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apdu_len += len;
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if (decoded_integer >= MAX_BACNET_SEGMENTATION)
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return -1;
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if (pSegmentation)
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*pSegmentation = decoded_integer;
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// Vendor ID - unsigned16
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len = decode_tag_number_and_value(&apdu[apdu_len], &tag_number, &len_value);
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apdu_len += len;
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if (tag_number != BACNET_APPLICATION_TAG_UNSIGNED_INT)
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return -1;
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len = decode_unsigned(&apdu[apdu_len], len_value, &decoded_value);
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apdu_len += len;
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if (decoded_value > 0xFFFF)
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return -1;
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if (pVendor_id)
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*pVendor_id = (uint16_t)decoded_value;
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return apdu_len;
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}
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int iam_decode_apdu(
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uint8_t *apdu,
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uint32_t *pDevice_id,
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unsigned *pMax_apdu,
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int *pSegmentation,
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uint16_t *pVendor_id)
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{
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int apdu_len = 0; // total length of the apdu, return value
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// valid data?
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if (!apdu)
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return -1;
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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 -1;
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if (apdu[1] != SERVICE_UNCONFIRMED_I_AM)
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return -1;
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apdu_len = iam_decode_service_request(
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&apdu[2],
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pDevice_id,
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pMax_apdu,
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pSegmentation,
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pVendor_id);
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return apdu_len;
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}
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int iam_send(uint8_t *buffer)
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{
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int pdu_len = 0;
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BACNET_ADDRESS dest;
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int bytes_sent = 0;
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// I-Am is a global broadcast
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datalink_get_broadcast_address(&dest);
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// encode the NPDU portion of the packet
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pdu_len = npdu_encode_apdu(
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&buffer[0],
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&dest,
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NULL,
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false, // true for confirmed messages
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MESSAGE_PRIORITY_NORMAL);
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// encode the APDU portion of the packet
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pdu_len += iam_encode_apdu(
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&buffer[pdu_len],
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Device_Object_Instance_Number(),
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MAX_APDU,
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SEGMENTATION_NONE,
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Device_Vendor_Identifier());
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bytes_sent = datalink_send_pdu(
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&dest, // destination address
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&buffer[0],
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pdu_len); // number of bytes of data
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return bytes_sent;
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}
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void iam_handler(
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uint8_t *service_request,
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uint16_t service_len,
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BACNET_ADDRESS *src)
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{
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int len = 0;
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uint32_t device_id = 0;
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unsigned max_apdu = 0;
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int segmentation = 0;
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uint16_t vendor_id = 0;
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(void)service_len;
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len = iam_decode_service_request(
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service_request,
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&device_id,
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&max_apdu,
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&segmentation,
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&vendor_id);
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// only add address if requested to bind
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address_add_binding(device_id,
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max_apdu,
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src);
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return;
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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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void testIAm(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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uint32_t device_id = 42;
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unsigned max_apdu = 480;
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int segmentation = SEGMENTATION_NONE;
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uint16_t vendor_id = 42;
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uint32_t test_device_id = 0;
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unsigned test_max_apdu = 0;
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int test_segmentation = 0;
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uint16_t test_vendor_id = 0;
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len = iam_encode_apdu(
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&apdu[0],
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device_id,
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max_apdu,
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segmentation,
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vendor_id);
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ct_test(pTest, len != 0);
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len = iam_decode_apdu(
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&apdu[0],
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&test_device_id,
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&test_max_apdu,
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&test_segmentation,
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&test_vendor_id);
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ct_test(pTest, len != -1);
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ct_test(pTest, test_device_id == device_id);
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ct_test(pTest, test_vendor_id == vendor_id);
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ct_test(pTest, test_max_apdu == max_apdu);
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ct_test(pTest, test_segmentation == segmentation);
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}
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#ifdef TEST_IAM
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// Dummy stubs to eliminate depencies
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void datalink_get_broadcast_address(
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BACNET_ADDRESS *dest) // destination address
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{
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(void)dest;
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}
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int datalink_send_pdu(
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BACNET_ADDRESS *dest, // destination address
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uint8_t *pdu, // any data to be sent - may be null
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unsigned pdu_len) // number of bytes of data
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{
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(void)dest;
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(void)pdu;
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return pdu_len;
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}
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uint16_t Device_Vendor_Identifier(void)
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{
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return 0;
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}
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uint32_t Device_Object_Instance_Number(void)
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{
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return 0;
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}
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void address_add_binding(
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uint32_t device_id,
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unsigned max_apdu,
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BACNET_ADDRESS *src)
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{
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(void)device_id;
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(void)max_apdu;
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(void)src;
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}
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// dummy for apdu dependency
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void tsm_free_invoke_id(uint8_t invokeID)
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{
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// dummy stub for testing
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(void)invokeID;
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}
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int main(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 I-Am", NULL);
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/* individual tests */
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rc = ct_addTestFunction(pTest, testIAm);
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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_IAM */
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#endif /* TEST */
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