/** Handler for Who-Has requests in the virtual routing setup,
* with broadcast I-Have response.
* Will respond if the device Object ID matches, and we have
* the Object or Object Name requested.
*
* @ingroup DMDOB
* @param service_request [in] The received message to be handled.
* @param service_len [in] Length of the service_request message.
* @param src [in] The BACNET_ADDRESS of the message's source (ignored).
*/
void handler_who_has_for_routing(
uint8_t * service_request,
uint16_t service_len,
BACNET_ADDRESS * src)
{
int len = 0;
BACNET_WHO_HAS_DATA data;
int32_t dev_instance;
int cursor = 0; /* Starting hint */
int my_list[2] = { 0, -1 }; /* Not really used, so dummy values */
BACNET_ADDRESS bcast_net;
(void) src;
len = whohas_decode_service_request(service_request, service_len, &data);
if (len > 0) {
/* Go through all devices, starting with the root gateway Device */
memset(&bcast_net, 0, sizeof(BACNET_ADDRESS));
bcast_net.net = BACNET_BROADCAST_NETWORK; /* That's all we have to set */
while (Routed_Device_GetNext(&bcast_net, my_list, &cursor)) {
dev_instance = Device_Object_Instance_Number();
if ((data.low_limit == -1) || (data.high_limit == -1) ||
((dev_instance >= data.low_limit) &&
(dev_instance <= data.high_limit)))
match_name_or_object(&data);
}
}
}
/** An APDU pre-handler that makes sure that the subsequent APDU handler call
* operates on the right Device Object(s), as addressed by the destination
* (routing) information.
*
* @note Even when the destination is "routed" to our virtual BACnet network,
* the src information does not need to change to reflect that (as it normally
* would for a routed message) because the reply will be sent from the level
* of the gateway Device.
*
* @param src [in] The BACNET_ADDRESS of the message's source.
* @param dest [in] The BACNET_ADDRESS of the message's destination.
* @param DNET_list [in] List of our reachable downstream BACnet Network numbers.
* Normally just one valid entry; terminated with a -1 value.
* @param apdu [in] The apdu portion of the request, to be processed.
* @param apdu_len [in] The total (remaining) length of the apdu.
*/
static void routed_apdu_handler(
BACNET_ADDRESS * src,
BACNET_ADDRESS * dest,
int *DNET_list,
uint8_t * apdu,
uint16_t apdu_len)
{
int cursor = 0; /* Starting hint */
bool bGotOne = false;
if (!Routed_Device_Is_Valid_Network(dest->net, DNET_list)) {
/* We don't know how to reach this one.
* The protocol doesn't specifically state this, but if this message
* was broadcast to us, we should assume "someone else" is handling
* it and not get involved (ie, send a Reject-Message).
* Since we can't reach other routers that src couldn't already reach,
* we don't try the standard path of asking Who-Is-Router-to-Network. */
#if defined(BACDL_BIP)
/* If wasn't unicast to us, must have been one of the bcast types.
* Drop it. */
if (bvlc_get_function_code() != BVLC_ORIGINAL_UNICAST_NPDU)
return;
#endif
/* Upper level handlers knew that this was sent as a bcast,
* but our only other way to guess at that here is if the dest->adr
* is absent, then we know this is some sort of bcast.
*/
if (dest->len > 0) {
Send_Reject_Message_To_Network(src, NETWORK_REJECT_NO_ROUTE,
dest->net);
} /* else, silently drop it */
return;
}
while (Routed_Device_GetNext(dest, DNET_list, &cursor)) {
apdu_handler(src, apdu, apdu_len);
bGotOne = true;
if (cursor < 0) /* If no more matches, */
break; /* We don't need to keep looking */
}
if (!bGotOne) {
/* Just silently drop this packet. */
}
}
