skarg
506 lines
19 KiB
C
506 lines
19 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 "bacdef.h"
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#include "bacdcode.h"
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#include "bacenum.h"
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#include "bits.h"
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#include "npdu.h"
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#include "apdu.h"
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void npdu_copy_data(BACNET_NPDU_DATA * dest, BACNET_NPDU_DATA * src)
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{
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if (dest && src) {
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dest->protocol_version = src->protocol_version;
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dest->data_expecting_reply = src->data_expecting_reply;
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dest->network_layer_message = src->network_layer_message;
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dest->priority = src->priority;
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dest->network_message_type = src->network_message_type;
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dest->vendor_id = src->vendor_id;
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dest->hop_count = src->hop_count;
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}
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return;
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}
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/*
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The following ICI parameters are exchanged with the
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various service primitives across an API:
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'destination_address' (DA): the address of the device(s)
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intended to receive the service primitive. Its format (device name,
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network address, etc.) is a local matter. This address
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may also be a multicast, local broadcast or global broadcast type.
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'source_address' (SA): the address of the device from which
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the service primitive was received. Its format (device name,
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network address, etc.) is a local matter.
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'network_priority' (NP): a four-level network priority parameter
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described in 6.2.2.
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'data_expecting_reply' (DER): a Boolean parameter that indicates
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whether (TRUE) or not (FALSE) a reply service primitive
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is expected for the service being issued.
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Table 5-1. Applicability of ICI parameters for abstract service primitives
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Service Primitive DA SA NP DER
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CONF_SERV.request Yes No Yes Yes
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CONF_SERV.indication Yes Yes Yes Yes
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CONF_SERV.response Yes No Yes Yes
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CONF_SERV.confirm Yes Yes Yes No
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UNCONF_SERV.request Yes No Yes No
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UNCONF_SERV.indication Yes Yes Yes No
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REJECT.request Yes No Yes No
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REJECT.indication Yes Yes Yes No
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SEGMENT_ACK.request Yes No Yes No
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SEGMENT_ACK.indication Yes Yes Yes No
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ABORT.request Yes No Yes No
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ABORT.indication Yes Yes Yes No
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*/
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int npdu_encode_pdu(uint8_t * npdu,
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BACNET_ADDRESS * dest,
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BACNET_ADDRESS * src, BACNET_NPDU_DATA * npdu_data)
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{
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int len = 0; /* return value - number of octets loaded in this function */
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int i = 0; /* counter */
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if (npdu && npdu_data) {
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/* protocol version */
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npdu[0] = npdu_data->protocol_version;
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/* initialize the control octet */
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npdu[1] = 0;
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/* Bit 7: 1 indicates that the NSDU conveys a network layer message. */
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/* Message Type field is present. */
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/* 0 indicates that the NSDU contains a BACnet APDU. */
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/* Message Type field is absent. */
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if (npdu_data->network_layer_message)
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npdu[1] |= BIT7;
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/*Bit 6: Reserved. Shall be zero. */
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/*Bit 5: Destination specifier where: */
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/* 0 = DNET, DLEN, DADR, and Hop Count absent */
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/* 1 = DNET, DLEN, and Hop Count present */
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/* DLEN = 0 denotes broadcast MAC DADR and DADR field is absent */
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/* DLEN > 0 specifies length of DADR field */
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if (dest && dest->net)
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npdu[1] |= BIT5;
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/* Bit 4: Reserved. Shall be zero. */
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/* Bit 3: Source specifier where: */
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/* 0 = SNET, SLEN, and SADR absent */
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/* 1 = SNET, SLEN, and SADR present */
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/* SLEN = 0 Invalid */
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/* SLEN > 0 specifies length of SADR field */
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if (src && src->net)
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npdu[1] |= BIT3;
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/* Bit 2: The value of this bit corresponds to the */
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/* data_expecting_reply parameter in the N-UNITDATA primitives. */
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/* 1 indicates that a BACnet-Confirmed-Request-PDU, */
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/* a segment of a BACnet-ComplexACK-PDU, */
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/* or a network layer message expecting a reply is present. */
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/* 0 indicates that other than a BACnet-Confirmed-Request-PDU, */
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/* a segment of a BACnet-ComplexACK-PDU, */
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/* or a network layer message expecting a reply is present. */
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if (npdu_data->data_expecting_reply)
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npdu[1] |= BIT2;
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/* Bits 1,0: Network priority where: */
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/* B'11' = Life Safety message */
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/* B'10' = Critical Equipment message */
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/* B'01' = Urgent message */
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/* B'00' = Normal message */
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npdu[1] |= (npdu_data->priority & 0x03);
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len = 2;
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if (dest && dest->net) {
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len += encode_unsigned16(&npdu[len], dest->net);
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npdu[len++] = dest->len;
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/* DLEN = 0 denotes broadcast MAC DADR and DADR field is absent */
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/* DLEN > 0 specifies length of DADR field */
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if (dest->len) {
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for (i = 0; i < dest->len; i++) {
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npdu[len++] = dest->adr[i];
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}
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}
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}
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if (src && src->net) {
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len += encode_unsigned16(&npdu[len], src->net);
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npdu[len++] = src->len;
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/* SLEN = 0 denotes broadcast MAC SADR and SADR field is absent */
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/* SLEN > 0 specifies length of SADR field */
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if (src->len) {
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for (i = 0; i < src->len; i++) {
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npdu[len++] = src->adr[i];
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}
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}
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}
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/* The Hop Count field shall be present only if the message is */
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/* destined for a remote network, i.e., if DNET is present. */
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/* This is a one-octet field that is initialized to a value of 0xff. */
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if (dest && dest->net) {
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npdu[len] = 0xFF;
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len++;
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}
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if (npdu_data->network_layer_message) {
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npdu[len] = npdu_data->network_message_type;
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len++;
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/* Message Type field contains a value in the range 0x80 - 0xFF, */
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/* then a Vendor ID field shall be present */
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if (npdu_data->network_message_type >= 0x80)
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len += encode_unsigned16(&npdu[len], npdu_data->vendor_id);
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}
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}
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return len;
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}
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/* Configure the NPDU portion of the packet for an APDU */
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/* This function does not handle the network messages, just APDUs. */
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void npdu_encode_npdu_data(BACNET_NPDU_DATA * npdu_data,
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bool data_expecting_reply, BACNET_MESSAGE_PRIORITY priority)
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{
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if (npdu_data) {
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npdu_data->data_expecting_reply = data_expecting_reply;
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npdu_data->protocol_version = BACNET_PROTOCOL_VERSION;
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npdu_data->network_layer_message = false; /* false if APDU */
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npdu_data->network_message_type = 0; /* optional */
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npdu_data->vendor_id = 0; /* optional, if net message type is > 0x80 */
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npdu_data->priority = priority;
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npdu_data->hop_count = 0;
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}
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}
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int npdu_decode(uint8_t * npdu,
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BACNET_ADDRESS * dest,
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BACNET_ADDRESS * src, BACNET_NPDU_DATA * npdu_data)
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{
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int len = 0; /* return value - number of octets loaded in this function */
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int i = 0; /* counter */
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uint16_t src_net = 0;
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uint16_t dest_net = 0;
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uint8_t address_len = 0;
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uint8_t mac_octet = 0;
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if (npdu && npdu_data) {
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/* Protocol Version */
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npdu_data->protocol_version = npdu[0];
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/* control octet */
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/* Bit 7: 1 indicates that the NSDU conveys a network layer message. */
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/* Message Type field is present. */
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/* 0 indicates that the NSDU contains a BACnet APDU. */
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/* Message Type field is absent. */
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npdu_data->network_layer_message = (npdu[1] & BIT7) ? true : false;
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/*Bit 6: Reserved. Shall be zero. */
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/* Bit 4: Reserved. Shall be zero. */
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/* Bit 2: The value of this bit corresponds to data expecting reply */
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/* parameter in the N-UNITDATA primitives. */
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/* 1 indicates that a BACnet-Confirmed-Request-PDU, */
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/* a segment of a BACnet-ComplexACK-PDU, */
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/* or a network layer message expecting a reply is present. */
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/* 0 indicates that other than a BACnet-Confirmed-Request-PDU, */
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/* a segment of a BACnet-ComplexACK-PDU, */
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/* or a network layer message expecting a reply is present. */
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npdu_data->data_expecting_reply = (npdu[1] & BIT2) ? true : false;
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/* Bits 1,0: Network priority where: */
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/* B'11' = Life Safety message */
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/* B'10' = Critical Equipment message */
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/* B'01' = Urgent message */
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/* B'00' = Normal message */
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npdu_data->priority = npdu[1] & 0x03;
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/* set the offset to where the optional stuff starts */
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len = 2;
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/*Bit 5: Destination specifier where: */
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/* 0 = DNET, DLEN, DADR, and Hop Count absent */
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/* 1 = DNET, DLEN, and Hop Count present */
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/* DLEN = 0 denotes broadcast MAC DADR and DADR field is absent */
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/* DLEN > 0 specifies length of DADR field */
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if (npdu[1] & BIT5) {
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len += decode_unsigned16(&npdu[len], &dest_net);
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/* DLEN = 0 denotes broadcast MAC DADR and DADR field is absent */
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/* DLEN > 0 specifies length of DADR field */
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address_len = npdu[len++];
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if (dest) {
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dest->net = dest_net;
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dest->len = address_len;
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}
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if (address_len) {
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for (i = 0; i < address_len; i++) {
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mac_octet = npdu[len++];
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if (dest)
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dest->adr[i] = mac_octet;
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}
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}
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}
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/* zero out the destination address */
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else if (dest) {
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dest->net = 0;
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dest->len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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dest->adr[i] = 0;
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}
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}
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/* Bit 3: Source specifier where: */
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/* 0 = SNET, SLEN, and SADR absent */
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/* 1 = SNET, SLEN, and SADR present */
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/* SLEN = 0 Invalid */
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/* SLEN > 0 specifies length of SADR field */
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if (npdu[1] & BIT3) {
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len += decode_unsigned16(&npdu[len], &src_net);
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/* SLEN = 0 denotes broadcast MAC SADR and SADR field is absent */
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/* SLEN > 0 specifies length of SADR field */
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address_len = npdu[len++];
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if (src) {
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src->net = src_net;
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src->len = address_len;
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}
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if (address_len) {
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for (i = 0; i < address_len; i++) {
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mac_octet = npdu[len++];
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if (src)
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src->adr[i] = mac_octet;
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}
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}
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} else if (src) {
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src->net = 0;
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src->len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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src->adr[i] = 0;
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}
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}
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/* The Hop Count field shall be present only if the message is */
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/* destined for a remote network, i.e., if DNET is present. */
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/* This is a one-octet field that is initialized to a value of 0xff. */
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if (dest_net)
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npdu_data->hop_count = npdu[len++];
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else
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npdu_data->hop_count = 0;
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/* Indicates that the NSDU conveys a network layer message. */
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/* Message Type field is present. */
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if (npdu_data->network_layer_message) {
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npdu_data->network_message_type = npdu[len++];
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/* Message Type field contains a value in the range 0x80 - 0xFF, */
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/* then a Vendor ID field shall be present */
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if (npdu_data->network_message_type >= 0x80)
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len +=
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decode_unsigned16(&npdu[len], &npdu_data->vendor_id);
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} else
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npdu_data->network_message_type = 0;
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}
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return len;
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}
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void npdu_handler(BACNET_ADDRESS * src, /* source address */
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uint8_t * pdu, /* PDU data */
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uint16_t pdu_len)
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{ /* length PDU */
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int apdu_offset = 0;
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BACNET_ADDRESS dest = { 0 };
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BACNET_NPDU_DATA npdu_data = { 0 };
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apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
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if (npdu_data.network_layer_message) {
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/*FIXME: network layer message received! Handle it! */
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} else {
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/* only handle the version that we know how to handle */
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if (npdu_data.protocol_version == BACNET_PROTOCOL_VERSION)
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apdu_handler(src, &pdu[apdu_offset], pdu_len - apdu_offset);
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}
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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 testNPDU2(Test * pTest)
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{
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uint8_t pdu[480] = { 0 };
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BACNET_ADDRESS dest = { 0 };
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BACNET_ADDRESS src = { 0 };
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BACNET_ADDRESS npdu_dest = { 0 };
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BACNET_ADDRESS npdu_src = { 0 };
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int len = 0;
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bool data_expecting_reply = true;
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BACNET_MESSAGE_PRIORITY priority = MESSAGE_PRIORITY_NORMAL;
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BACNET_NPDU_DATA npdu_data = { 0 };
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int i = 0; /* counter */
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int npdu_len = 0;
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bool network_layer_message = false; /* false if APDU */
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BACNET_NETWORK_MESSAGE_TYPE network_message_type = 0; /* optional */
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uint16_t vendor_id = 0; /* optional, if net message type is > 0x80 */
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/* mac_len = 0 if global address */
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dest.mac_len = 6;
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for (i = 0; i < dest.mac_len; i++) {
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dest.mac[i] = i;
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}
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/* DNET,DLEN,DADR */
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dest.net = 1;
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dest.len = 6;
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for (i = 0; i < dest.len; i++) {
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dest.adr[i] = i * 10;
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}
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src.mac_len = 1;
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for (i = 0; i < src.mac_len; i++) {
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src.mac[i] = 0x80;
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}
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/* SNET,SLEN,SADR */
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src.net = 2;
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src.len = 1;
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for (i = 0; i < src.len; i++) {
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src.adr[i] = 0x40;
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}
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npdu_encode_npdu_data(&npdu_data, true, priority);
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len = npdu_encode_pdu(&pdu[0], &dest, &src, &npdu_data);
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ct_test(pTest, len != 0);
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/* can we get the info back? */
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npdu_len = npdu_decode(&pdu[0], &npdu_dest, &npdu_src, &npdu_data);
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ct_test(pTest, npdu_len != 0);
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ct_test(pTest, npdu_data.data_expecting_reply == data_expecting_reply);
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ct_test(pTest,
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npdu_data.network_layer_message == network_layer_message);
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ct_test(pTest, npdu_data.network_message_type == network_message_type);
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ct_test(pTest, npdu_data.vendor_id == vendor_id);
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ct_test(pTest, npdu_data.priority == priority);
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/* DNET,DLEN,DADR */
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ct_test(pTest, npdu_dest.net == dest.net);
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ct_test(pTest, npdu_dest.len == dest.len);
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for (i = 0; i < dest.len; i++) {
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ct_test(pTest, npdu_dest.adr[i] == dest.adr[i]);
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}
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/* SNET,SLEN,SADR */
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ct_test(pTest, npdu_src.net == src.net);
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ct_test(pTest, npdu_src.len == src.len);
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for (i = 0; i < src.len; i++) {
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ct_test(pTest, npdu_src.adr[i] == src.adr[i]);
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}
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}
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void testNPDU1(Test * pTest)
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{
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uint8_t pdu[480] = { 0 };
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BACNET_ADDRESS dest = { 0 };
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BACNET_ADDRESS src = { 0 };
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BACNET_ADDRESS npdu_dest = { 0 };
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BACNET_ADDRESS npdu_src = { 0 };
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int len = 0;
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bool data_expecting_reply = false;
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BACNET_MESSAGE_PRIORITY priority = MESSAGE_PRIORITY_NORMAL;
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BACNET_NPDU_DATA npdu_data = { 0 };
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int i = 0; /* counter */
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int npdu_len = 0;
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bool network_layer_message = false; /* false if APDU */
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BACNET_NETWORK_MESSAGE_TYPE network_message_type = 0; /* optional */
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uint16_t vendor_id = 0; /* optional, if net message type is > 0x80 */
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/* mac_len = 0 if global address */
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dest.mac_len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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dest.mac[i] = 0;
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}
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/* DNET,DLEN,DADR */
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dest.net = 0;
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dest.len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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dest.adr[i] = 0;
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}
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src.mac_len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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src.mac[i] = 0;
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}
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/* SNET,SLEN,SADR */
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src.net = 0;
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src.len = 0;
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for (i = 0; i < MAX_MAC_LEN; i++) {
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src.adr[i] = 0;
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|
}
|
|
npdu_encode_npdu_data(&npdu_data, false, priority);
|
|
len = npdu_encode_pdu(&pdu[0], &dest, &src, &npdu_data);
|
|
ct_test(pTest, len != 0);
|
|
/* can we get the info back? */
|
|
npdu_len = npdu_decode(&pdu[0], &npdu_dest, &npdu_src, &npdu_data);
|
|
ct_test(pTest, npdu_len != 0);
|
|
ct_test(pTest, npdu_data.data_expecting_reply == data_expecting_reply);
|
|
ct_test(pTest,
|
|
npdu_data.network_layer_message == network_layer_message);
|
|
ct_test(pTest, npdu_data.network_message_type == network_message_type);
|
|
ct_test(pTest, npdu_data.vendor_id == vendor_id);
|
|
ct_test(pTest, npdu_data.priority == priority);
|
|
ct_test(pTest, npdu_dest.mac_len == src.mac_len);
|
|
ct_test(pTest, npdu_src.mac_len == dest.mac_len);
|
|
}
|
|
|
|
#ifdef TEST_NPDU
|
|
/* dummy stub for testing */
|
|
void tsm_free_invoke_id(uint8_t invokeID)
|
|
{
|
|
(void) invokeID;
|
|
}
|
|
|
|
void iam_handler(uint8_t * service_request,
|
|
uint16_t service_len, BACNET_ADDRESS * src)
|
|
{
|
|
(void) service_request;
|
|
(void) service_len;
|
|
(void) src;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
Test *pTest;
|
|
bool rc;
|
|
|
|
pTest = ct_create("BACnet NPDU", NULL);
|
|
/* individual tests */
|
|
rc = ct_addTestFunction(pTest, testNPDU1);
|
|
assert(rc);
|
|
rc = ct_addTestFunction(pTest, testNPDU2);
|
|
assert(rc);
|
|
|
|
ct_setStream(pTest, stdout);
|
|
ct_run(pTest);
|
|
(void) ct_report(pTest);
|
|
ct_destroy(pTest);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* TEST_NPDU */
|
|
#endif /* TEST */
|