static void
sensorentry_set_test_q(u8_t rid, struct obj_def *od)
{
LWIP_UNUSED_ARG(od);
/* fake async quesion/answer */
snmp_msg_event(rid);
}
static void
sensorentry_set_value_q(u8_t rid, struct obj_def *od, u16_t len, void *value)
{
LWIP_UNUSED_ARG(rid);
LWIP_UNUSED_ARG(od);
LWIP_UNUSED_ARG(len);
LWIP_UNUSED_ARG(value);
/* fake async quesion/answer */
snmp_msg_event(rid);
}
/**
* Async question for object definition
*/
static void
sensorentry_get_object_def_q(void* addr_inf, u8_t rid, u8_t ident_len, s32_t *ident)
{
s32_t sensor_register, sensor_address;
LWIP_UNUSED_ARG(addr_inf);
LWIP_UNUSED_ARG(rid);
ident_len += 1;
ident -= 1;
/* send request */
sensor_register = ident[0];
sensor_address = ident[1];
LWIP_DEBUGF(SNMP_MIB_DEBUG,("sensor_request reg=%"S32_F" addr=%"S32_F"\n",
sensor_register, sensor_address));
/* fake async quesion/answer */
snmp_msg_event(rid);
}
/* lwIP UDP receive callback function */
static void
snmp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
{
struct snmp_msg_pstat *msg_ps;
u8_t req_idx;
err_t err_ret;
u16_t payload_len = p->tot_len;
u16_t payload_ofs = 0;
u16_t varbind_ofs = 0;
/* suppress unused argument warning */
LWIP_UNUSED_ARG(arg);
/* traverse input message process list, look for SNMP_MSG_EMPTY */
msg_ps = &msg_input_list[0];
req_idx = 0;
while ((req_idx < SNMP_CONCURRENT_REQUESTS) && (msg_ps->state != SNMP_MSG_EMPTY)) {
req_idx++;
msg_ps++;
}
if (req_idx == SNMP_CONCURRENT_REQUESTS) {
/* exceeding number of concurrent requests */
pbuf_free(p);
return;
}
/* accepting request */
snmp_inc_snmpinpkts();
/* record used 'protocol control block' */
msg_ps->pcb = pcb;
/* source address (network order) */
msg_ps->sip = *addr;
/* source port (host order (lwIP oddity)) */
msg_ps->sp = port;
/* check total length, version, community, pdu type */
err_ret = snmp_pdu_header_check(p, payload_ofs, payload_len, &varbind_ofs, msg_ps);
/* Only accept requests and requests without error (be robust) */
/* Reject response and trap headers or error requests as input! */
if ((err_ret != ERR_OK) ||
((msg_ps->rt != SNMP_ASN1_PDU_GET_REQ) &&
(msg_ps->rt != SNMP_ASN1_PDU_GET_NEXT_REQ) &&
(msg_ps->rt != SNMP_ASN1_PDU_SET_REQ)) ||
((msg_ps->error_status != SNMP_ES_NOERROR) ||
(msg_ps->error_index != 0)) ) {
/* header check failed drop request silently, do not return error! */
pbuf_free(p);
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_header_check() failed\n"));
return;
}
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv ok, community %s\n", msg_ps->community));
/* Builds a list of variable bindings. Copy the varbinds from the pbuf
chain to glue them when these are divided over two or more pbuf's. */
err_ret = snmp_pdu_dec_varbindlist(p, varbind_ofs, &varbind_ofs, msg_ps);
/* we've decoded the incoming message, release input msg now */
pbuf_free(p);
if ((err_ret != ERR_OK) || (msg_ps->invb.count == 0)) {
/* varbind-list decode failed, or varbind list empty.
drop request silently, do not return error!
(errors are only returned for a specific varbind failure) */
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_pdu_dec_varbindlist() failed\n"));
return;
}
msg_ps->error_status = SNMP_ES_NOERROR;
msg_ps->error_index = 0;
/* find object for each variable binding */
msg_ps->state = SNMP_MSG_SEARCH_OBJ;
/* first variable binding from list to inspect */
msg_ps->vb_idx = 0;
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_recv varbind cnt=%"U16_F"\n",(u16_t)msg_ps->invb.count));
/* handle input event and as much objects as possible in one go */
snmp_msg_event(req_idx);
}