// return a pdu from a buffer
int wpdu::get_pdu(Pdu& pdu, snmp_version& version)
{
if (iovec_.iov_len == 0)
return -1; // NO DATA
snmp_pdu *raw_pdu;
raw_pdu = cmu_snmp::pdu_create(0);
if (!raw_pdu) {
return SNMP_CLASS_RESOURCE_UNAVAIL;
}
// max value a client can send us - TODO: replace this with an
// api to get actual string length
int status = cmu_snmp::parse( raw_pdu, (unsigned char *)iovec_.iov_base,
community_name, comm_len,
version, iovec_.iov_len);
if (status != 0)
return SNMP_CLASS_INTERNAL_ERROR;
community_name[comm_len] = 0; // set null based on returned length
set_request_id( &pdu, raw_pdu->reqid);
set_error_status( &pdu, (int) raw_pdu->errstat);
set_error_index( &pdu, (int) raw_pdu->errindex);
pdu.set_type( raw_pdu->command);
if (restore_vbs(pdu, raw_pdu)) {
cmu_snmp::free_pdu(raw_pdu);
return SNMP_CLASS_INTERNAL_ERROR;
}
cmu_snmp::free_pdu(raw_pdu);
return 0;
}
int Snmp::run_transaction(Pdu& pdu, UdpTarget& target)
{
int rc, done = 0;
// 1. set unique id to match this packet on return
size_t hold_req_id = req_id_++;
set_request_id(&pdu, hold_req_id);
// 2. write request to agent
transaction trans(pdu, target, iv_snmp_session_);
// this call blocks while it attempts to retrieve agent response
while (!done) {
if ((rc = trans.run()) < 0) {
last_transaction_status_ = rc;
return rc;
}
else {
trans.result(pdu);
// verify this is the pdu we are after
if (pdu.get_request_id() == hold_req_id)
done = 1 ;
}
}
return 0;
}
int Snmp::run_transaction(Pdu& pdu, UdpTarget& target, Snmp_Result * cb)
{
if (!cb)
return run_transaction(pdu, target);
// 1. set unique id to match this packet on return
hold_req_id_ = req_id_++;
set_request_id(&pdu, hold_req_id_);
pdu_ = &pdu;
result_ = cb;
// 2. write request to agent
transaction * trans = new transaction(pdu, target, iv_snmp_session_);
return trans->run(this);
}
