func DecodePDUBody2(buffer *C.asn_buf_t, pdu *C.snmp_pdu_t) (SnmpError, bool) {
var recv_len C.int32_t
var ignored C.int32_t = 0
var ret_code uint32
if C.SNMP_V3 == pdu.version {
if C.SNMP_SECMODEL_USM != pdu.security_model {
return Errorf(SNMP_CODE_FAILED, "unsupport security model - %d", int(pdu.security_model)), false
}
if ret_code = C.snmp_pdu_decode_secmode(buffer, pdu); C.SNMP_CODE_OK != ret_code {
return Error(SnmpResult(ret_code), C.GoString(C.snmp_pdu_get_error(pdu, ret_code))), false
}
}
if ret_code = C.snmp_pdu_decode_scoped2(buffer, pdu, &recv_len, &ignored); C.SNMP_CODE_OK != ret_code {
switch ret_code {
case C.SNMP_CODE_BADENC:
if C.SNMP_Verr == pdu.version {
return Errorf(SNMP_CODE_FAILED, "unsupport security model - %d", int(pdu.security_model)), false
}
}
return Error(SnmpResult(ret_code), C.GoString(C.snmp_pdu_get_error(pdu, ret_code))), false
}
if 1 == ignored {
return nil, true
}
return nil, false
}
func fill_pdu_for_test_crypt(is_encrypt bool, pt C.enum_snmp_privacy, salt, key, data []byte) ([]byte, error) {
var digest [100000]byte
var pdu C.snmp_pdu_t
C.snmp_pdu_init(&pdu)
pdu.user.priv_proto = pt
C.memcpy(unsafe.Pointer(&pdu.user.priv_key[0]), unsafe.Pointer(&key[0]), C.size_t(C.SNMP_PRIV_KEY_SIZ))
pdu.user.priv_len = C.size_t(16) //C.size_t(C.SNMP_PRIV_KEY_SIZ) //(au == SNMP_PRIV_DES ) ? SNMP_AUTH_HMACMD5_KEY_SIZ : SNMP_AUTH_HMACSHA_KEY_SIZ;
pdu.engine.engine_boots = 3
pdu.engine.engine_time = 3
C.memcpy(unsafe.Pointer(&pdu.msg_salt[0]), unsafe.Pointer(&salt[0]), 8)
copy(digest[:], data)
pdu.scoped_ptr = (*C.u_char)(unsafe.Pointer(&digest[0]))
pdu.scoped_len = C.size_t((len(data) / 8) * 8)
var ret_code C.enum_snmp_code
if is_encrypt {
ret_code = C.snmp_pdu_encrypt(&pdu)
} else {
ret_code = C.snmp_pdu_decrypt(&pdu)
}
if 0 != ret_code {
err := errors.New(C.GoString(C.snmp_pdu_get_error(&pdu, ret_code)))
return nil, err
}
return readGoBytes((*C.uint8_t)(pdu.scoped_ptr), C.uint32_t(pdu.scoped_len)), nil
}
func DecodePDUHeader(buffer *C.asn_buf_t, pdu *C.snmp_pdu_t) SnmpError {
C.snmp_pdu_init(pdu)
ret_code := C.snmp_pdu_decode_header(buffer, pdu)
if 0 != ret_code {
return Error(SNMP_CODE_FAILED, "decode pdu header failed -"+C.GoString(C.snmp_pdu_get_error(pdu, ret_code)))
}
return nil
}
func encodeNativePdu(bs []byte, pdu *C.snmp_pdu_t) ([]byte, SnmpError) {
if pdu.engine.max_msg_size == 0 {
pdu.engine.max_msg_size = C.int32_t(*maxPDUSize)
}
var buffer C.asn_buf_t
C.set_asn_u_ptr(&buffer.asn_u, (*C.char)(unsafe.Pointer(&bs[0])))
buffer.asn_len = C.size_t(len(bs))
ret_code := C.snmp_pdu_encode(pdu, &buffer)
if 0 != ret_code {
err := Error(SnmpResult(ret_code), C.GoString(C.snmp_pdu_get_error(pdu, ret_code)))
return nil, err
}
length := C.get_buffer_length(&buffer, (*C.u_char)(unsafe.Pointer(&bs[0])))
return bs[0:length], nil
}
