static void My_NPDU_Handler(
BACNET_ADDRESS * src, /* source address */
uint8_t * pdu, /* PDU data */
uint16_t pdu_len)
{ /* length PDU */
int apdu_offset = 0;
BACNET_ADDRESS dest = { 0 };
BACNET_NPDU_DATA npdu_data = { 0 };
apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
if (npdu_data.network_layer_message) {
if (apdu_offset <= pdu_len) {
My_Router_Handler(src, &npdu_data, &pdu[apdu_offset],
(uint16_t) (pdu_len - apdu_offset));
}
} else if ((apdu_offset > 0) && (apdu_offset <= pdu_len)) {
if ((npdu_data.protocol_version == BACNET_PROTOCOL_VERSION) &&
((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK))) {
/* only handle the version that we know how to handle */
/* and we are not a router, so ignore messages with
routing information cause they are not for us */
apdu_handler(src, &pdu[apdu_offset],
(uint16_t) (pdu_len - apdu_offset));
} else {
if (dest.net) {
debug_printf("NPDU: DNET=%d. Discarded!\n", dest.net);
} else {
debug_printf("NPDU: BACnet Protocol Version=%d. Discarded!\n",
npdu_data.protocol_version);
}
}
}
return;
}
void testNPDU1(
Test * pTest)
{
uint8_t pdu[480] = { 0 };
BACNET_ADDRESS dest = { 0 };
BACNET_ADDRESS src = { 0 };
BACNET_ADDRESS npdu_dest = { 0 };
BACNET_ADDRESS npdu_src = { 0 };
int len = 0;
bool data_expecting_reply = false;
BACNET_MESSAGE_PRIORITY priority = MESSAGE_PRIORITY_NORMAL;
BACNET_NPDU_DATA npdu_data = { 0 };
int i = 0; /* counter */
int npdu_len = 0;
bool network_layer_message = false; /* false if APDU */
BACNET_NETWORK_MESSAGE_TYPE network_message_type = 0; /* optional */
uint16_t vendor_id = 0; /* optional, if net message type is > 0x80 */
/* mac_len = 0 if global address */
dest.mac_len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
dest.mac[i] = 0;
}
/* DNET,DLEN,DADR */
dest.net = 0;
dest.len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
dest.adr[i] = 0;
}
src.mac_len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
src.mac[i] = 0;
}
/* SNET,SLEN,SADR */
src.net = 0;
src.len = 0;
for (i = 0; i < MAX_MAC_LEN; i++) {
src.adr[i] = 0;
}
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);
if (npdu_data.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);
}
/** Handler for the NPDU portion of a received packet.
* Aside from error-checking, if the NPDU doesn't contain routing info,
* this handler doesn't do much besides stepping over the NPDU header
* and passing the remaining bytes to the apdu_handler.
* @note The routing (except src) and NCPI information, including
* npdu_data->data_expecting_reply, are discarded.
* @see routing_npdu_handler
*
* @ingroup MISCHNDLR
*
* @param src [out] Returned with routing source information if the NPDU
* has any and if this points to non-null storage for it.
* If src->net and src->len are 0 on return, there is no
* routing source information.
* This src describes the original source of the message when
* it had to be routed to reach this BACnet Device, and this
* is passed down into the apdu_handler; however, I don't
* think this project's code has any use for the src info
* on return from this handler, since the response has
* already been sent via the apdu_handler.
* @param pdu [in] Buffer containing the NPDU and APDU of the received packet.
* @param pdu_len [in] The size of the received message in the pdu[] buffer.
*/
void npdu_handler(
PORT_SUPPORT *portParams,
BACNET_ADDRESS * src, /* source address */
uint8_t * pdu, /* PDU data */
uint16_t pdu_len)
{ /* length PDU */
int apdu_offset = 0;
BACNET_ADDRESS dest = { 0 };
BACNET_NPDU_DATA npdu_data = { 0 };
/* only handle the version that we know how to handle */
if (pdu[0] == BACNET_PROTOCOL_VERSION) {
apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
if (npdu_data.network_layer_message) {
/*FIXME: network layer message received! Handle it! */
#if PRINT_ENABLED
fprintf(stderr, "NPDU: Network Layer Message discarded!\n");
#endif
} else if ((apdu_offset > 0) && (apdu_offset <= pdu_len)) {
if ((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK)) {
/* only handle the version that we know how to handle */
/* and we are not a router, so ignore messages with
routing information cause they are not for us */
if ((dest.net == BACNET_BROADCAST_NETWORK) &&
((pdu[apdu_offset] & 0xF0) ==
PDU_TYPE_CONFIRMED_SERVICE_REQUEST)) {
/* hack for 5.4.5.1 - IDLE */
/* ConfirmedBroadcastReceived */
/* then enter IDLE - ignore the PDU */
} else {
apdu_handler(portParams, src, &pdu[apdu_offset],
(uint16_t) (pdu_len - apdu_offset));
}
} else {
#if PRINT_ENABLED
printf("NPDU: DNET=%u. Discarded!\n", (unsigned) dest.net);
#endif
}
}
} else {
#if PRINT_ENABLED
printf("NPDU: BACnet Protocol Version=%u. Discarded!\n",
(unsigned) pdu[0]);
#endif
}
return;
}
static void mstp_monitor_i_am(
uint8_t mac,
uint8_t *pdu,
uint16_t pdu_len)
{
BACNET_ADDRESS src = { 0 };
BACNET_ADDRESS dest = { 0 };
BACNET_NPDU_DATA npdu_data = { 0 };
int apdu_offset = 0;
uint16_t apdu_len = 0;
uint8_t *apdu = NULL;
uint8_t pdu_type = 0;
uint8_t service_choice = 0;
uint8_t *service_request = NULL;
uint32_t device_id = 0;
int len = 0;
if (pdu[0] == BACNET_PROTOCOL_VERSION) {
MSTP_Fill_BACnet_Address(&src, mac);
apdu_offset = npdu_decode(&pdu[0], &dest, &src, &npdu_data);
if ((!npdu_data.network_layer_message) &&
(apdu_offset > 0) && (apdu_offset < pdu_len) &&
((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK)) &&
(src.net == 0)) {
apdu_len = pdu_len - apdu_offset;
apdu = &pdu[apdu_offset];
pdu_type = apdu[0] & 0xF0;
if ((pdu_type == PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST) &&
(apdu_len >= 2)) {
service_choice = apdu[1];
service_request = &apdu[2];
if (service_choice == SERVICE_UNCONFIRMED_I_AM) {
len = iam_decode_service_request(service_request,
&device_id, NULL, NULL, NULL);
if (len != -1) {
MSTP_Statistics[mac].device_id = device_id;
}
}
}
}
}
}
/** Handler for the NPDU portion of a received packet, which may have routing.
* This is a fuller handler than the regular npdu_handler, as it manages
* - Decoding of the NCPI byte
* - Further processing by network_control_handler() if this is a network
* layer message.
* - Further processing by routed_apdu_handler() if it contains an APDU
* - Normally (no routing) by apdu_handler()
* - With Routing (a further destination was indicated) by the decoded
* destination.
* - Errors in decoding.
* @note The npdu_data->data_expecting_reply status is discarded.
* @see npdu_handler
* @ingroup NMRC
*
* @param src [out] Returned with routing source information if the NPDU
* has any and if this points to non-null storage for it.
* If src->net and src->len are 0 on return, there is no
* routing source information.
* This src describes the original source of the message when
* it had to be routed to reach this BACnet Device, and this
* is passed down into the apdu_handler; however, I don't
* think this project's code has any use for the src info
* on return from this handler, since the response has
* already been sent via the apdu_handler.
* @param DNET_list [in] List of our reachable downstream BACnet Network numbers.
* Normally just one valid entry; terminated with a -1 value.
* @param pdu [in] Buffer containing the NPDU and APDU of the received packet.
* @param pdu_len [in] The size of the received message in the pdu[] buffer.
*/
void routing_npdu_handler(
BACNET_ADDRESS * src,
int *DNET_list,
uint8_t * pdu,
uint16_t pdu_len)
{
int apdu_offset = 0;
BACNET_ADDRESS dest = { 0 };
BACNET_NPDU_DATA npdu_data = { 0 };
/* only handle the version that we know how to handle */
if (pdu[0] == BACNET_PROTOCOL_VERSION) {
apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
if (apdu_offset <= 0) {
debug_printf("NPDU: Decoding failed; Discarded!\n");
} else if (npdu_data.network_layer_message) {
if ((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK)) {
network_control_handler(src, DNET_list, &npdu_data,
&pdu[apdu_offset], (uint16_t) (pdu_len - apdu_offset));
} else {
/* The DNET is set, but we don't support downstream routers,
* so we just silently drop this network layer message,
* since only routers can handle it (even if for our DNET) */
}
} else if (apdu_offset <= pdu_len) {
if ((dest.net == 0) || (npdu_data.hop_count > 1))
routed_apdu_handler(src, &dest, DNET_list, &pdu[apdu_offset],
(uint16_t) (pdu_len - apdu_offset));
/* Else, hop_count bottomed out and we discard this one. */
}
} else {
/* Should we send NETWORK_MESSAGE_REJECT_MESSAGE_TO_NETWORK? */
debug_printf
("NPDU: Unsupported BACnet Protocol Version=%u. Discarded!\n",
(unsigned) pdu[0]);
}
return;
}
/** Handler for the NPDU portion of a received packet.
* Aside from error-checking, if the NPDU doesn't contain routing info,
* this handler doesn't do much besides stepping over the NPDU header
* and passing the remaining bytes to the apdu_handler.
* @note The routing (except src) and NCPI information, including
* npdu_data->data_expecting_reply, are discarded.
* @see routing_npdu_handler
*
* @ingroup MISCHNDLR
*
* @param src [out] Returned with routing source information if the NPDU
* has any and if this points to non-null storage for it.
* If src->net and src->len are 0 on return, there is no
* routing source information.
* This src describes the original source of the message when
* it had to be routed to reach this BACnet Device, and this
* is passed down into the apdu_handler; however, I don't
* think this project's code has any use for the src info
* on return from this handler, since the response has
* already been sent via the apdu_handler.
* @param pdu [in] Buffer containing the NPDU and APDU of the received packet.
* @param pdu_len [in] The size of the received message in the pdu[] buffer.
*/
void npdu_handler(
BACNET_ADDRESS * src, /* source address */
uint8_t * pdu, /* PDU data */
uint16_t pdu_len)
{ /* length PDU */
int apdu_offset = 0;
BACNET_ADDRESS dest = { 0 };
BACNET_NPDU_DATA npdu_data = { 0 };
/* only handle the version that we know how to handle */
if (pdu[0] == BACNET_PROTOCOL_VERSION) {
apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
if (npdu_data.network_layer_message) {
/*FIXME: network layer message received! Handle it! */
#ifdef PRINT_ENABLE
fprintf(stderr, "NPDU: Network Layer Message discarded!\n");
#endif
} else if ((apdu_offset > 0) && (apdu_offset <= pdu_len)) {
if ((dest.net == 0) || (dest.net == BACNET_BROADCAST_NETWORK)) {
/* only handle the version that we know how to handle */
/* and we are not a router, so ignore messages with
routing information cause they are not for us */
apdu_handler(src, &pdu[apdu_offset],
(uint16_t) (pdu_len - apdu_offset));
} else {
#ifdef PRINT_ENABLE
fprintf(stderr, "NPDU: DNET=%u. Discarded!\n", (unsigned) dest.net);
#endif
}
}
} else {
#ifdef PRINT_ENABLE
fprintf(stderr, "NPDU: BACnet Protocol Version=%u. Discarded!\n",
(unsigned) pdu[0]);
#endif
}
return;
}
bool dlmstp_compare_data_expecting_reply(
uint8_t * request_pdu,
uint16_t request_pdu_len,
uint8_t src_address,
uint8_t * reply_pdu,
uint16_t reply_pdu_len,
BACNET_ADDRESS * dest_address)
{
uint16_t offset;
/* One way to check the message is to compare NPDU
src, dest, along with the APDU type, invoke id.
Seems a bit overkill */
struct DER_compare_t {
BACNET_NPDU_DATA npdu_data;
BACNET_ADDRESS address;
uint8_t pdu_type;
uint8_t invoke_id;
uint8_t service_choice;
};
struct DER_compare_t request;
struct DER_compare_t reply;
/* unused parameters */
request_pdu_len = request_pdu_len;
reply_pdu_len = reply_pdu_len;
/* decode the request data */
request.address.mac[0] = src_address;
request.address.mac_len = 1;
offset =
npdu_decode(&request_pdu[0], NULL, &request.address,
&request.npdu_data);
if (request.npdu_data.network_layer_message) {
return false;
}
request.pdu_type = request_pdu[offset] & 0xF0;
if (request.pdu_type != PDU_TYPE_CONFIRMED_SERVICE_REQUEST) {
return false;
}
request.invoke_id = request_pdu[offset + 2];
/* segmented message? */
if (request_pdu[offset] & BIT3)
request.service_choice = request_pdu[offset + 5];
else
request.service_choice = request_pdu[offset + 3];
/* decode the reply data */
bacnet_address_copy(&reply.address, dest_address);
offset =
npdu_decode(&reply_pdu[0], &reply.address, NULL, &reply.npdu_data);
if (reply.npdu_data.network_layer_message) {
return false;
}
/* reply could be a lot of things:
confirmed, simple ack, abort, reject, error */
reply.pdu_type = reply_pdu[offset] & 0xF0;
switch (reply.pdu_type) {
case PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
reply.invoke_id = reply_pdu[offset + 2];
/* segmented message? */
if (reply_pdu[offset] & BIT3)
reply.service_choice = reply_pdu[offset + 5];
else
reply.service_choice = reply_pdu[offset + 3];
break;
case PDU_TYPE_SIMPLE_ACK:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_COMPLEX_ACK:
reply.invoke_id = reply_pdu[offset + 1];
/* segmented message? */
if (reply_pdu[offset] & BIT3)
reply.service_choice = reply_pdu[offset + 4];
else
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_ERROR:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_REJECT:
case PDU_TYPE_ABORT:
reply.invoke_id = reply_pdu[offset + 1];
break;
default:
return false;
}
/* these don't have service choice included */
if ((reply.pdu_type == PDU_TYPE_REJECT) ||
(reply.pdu_type == PDU_TYPE_ABORT)) {
if (request.invoke_id != reply.invoke_id) {
return false;
}
} else {
if (request.invoke_id != reply.invoke_id) {
return false;
}
if (request.service_choice != reply.service_choice) {
return false;
}
}
if (request.npdu_data.protocol_version != reply.npdu_data.protocol_version) {
return false;
}
if (request.npdu_data.priority != reply.npdu_data.priority) {
return false;
}
if (!bacnet_address_same(&request.address, &reply.address)) {
return false;
}
return true;
}