/**
* Encodes a <code>Variable</code> to an <code>OutputStream</code>.
*
* @param outputStream an <code>OutputStream</code>.
* @throws IOException if an error occurs while writing to the stream.
*/
@Override
public void encodeBER(OutputStream outputStream) throws IOException {
BER.encodeHeader(outputStream, type, getBERPayloadLength());
if (type == PDU.V1TRAP) {
enterprise.encodeBER(outputStream);
agentAddress.encodeBER(outputStream);
genericTrap.encodeBER(outputStream);
specificTrap.encodeBER(outputStream);
timestamp.encodeBER(outputStream);
} else {
requestID.encodeBER(outputStream);
errorStatus.encodeBER(outputStream);
errorIndex.encodeBER(outputStream);
}
int vbLength = 0;
for (VariableBinding variableBinding : variableBindings) {
vbLength += variableBinding.getBERLength();
}
BER.encodeHeader(outputStream, BER.SEQUENCE, vbLength);
for (VariableBinding vb : variableBindings) {
if (!isVariableV1(vb.getVariable())) {
throw new IOException("Cannot encode Counter64 into a SNMPv1 PDU");
}
vb.encodeBER(outputStream);
}
}
// TODO return OpenMUC value
private double getValue(SML_ListEntry entry) {
double value = 0;
ASNObject obj = entry.getValue().getChoice();
if (obj.getClass().equals(Integer64.class)) {
Integer64 val = (Integer64) obj;
value = val.getVal();
} else if (obj.getClass().equals(Integer32.class)) {
Integer32 val = (Integer32) obj;
value = val.getVal();
} else if (obj.getClass().equals(Integer16.class)) {
Integer16 val = (Integer16) obj;
value = val.getVal();
} else if (obj.getClass().equals(Integer8.class)) {
Integer8 val = (Integer8) obj;
value = val.getVal();
} else if (obj.getClass().equals(Unsigned64.class)) {
Unsigned64 val = (Unsigned64) obj;
value = val.getVal();
} else if (obj.getClass().equals(Unsigned32.class)) {
Unsigned32 val = (Unsigned32) obj;
value = val.getVal();
} else if (obj.getClass().equals(Unsigned16.class)) {
Unsigned16 val = (Unsigned16) obj;
value = val.getVal();
} else if (obj.getClass().equals(Unsigned8.class)) {
Unsigned8 val = (Unsigned8) obj;
value = val.getVal();
} else {
return Double.NaN;
}
byte scaler = entry.getScaler().getVal();
return value * Math.pow(10, scaler);
}
/**
* Decodes a <code>Variable</code> from an <code>InputStream</code>.
*
* @param inputStream an <code>InputStream</code> containing a BER encoded byte stream.
* @throws IOException
*/
@Override
public void decodeBER(BERInputStream inputStream) throws IOException {
MutableByte pduType = new MutableByte();
int length = BER.decodeHeader(inputStream, pduType);
int pduStartPos = (int) inputStream.getPosition();
switch (pduType.getValue()) {
case PDU.SET:
case PDU.GET:
case PDU.GETNEXT:
case PDU.V1TRAP:
case PDU.RESPONSE:
break;
// The following PDU types are not supported by the SNMPv1 standard!
case PDU.NOTIFICATION:
case PDU.INFORM:
if (SNMP4JSettings.isAllowSNMPv2InV1()) {
break;
}
// fall through
default:
throw new IOException("Unsupported PDU type: " + pduType.getValue());
}
this.setType(pduType.getValue());
if (getType() == PDU.V1TRAP) {
enterprise.decodeBER(inputStream);
agentAddress.decodeBER(inputStream);
genericTrap.decodeBER(inputStream);
specificTrap.decodeBER(inputStream);
timestamp.decodeBER(inputStream);
} else {
requestID.decodeBER(inputStream);
errorStatus.decodeBER(inputStream);
errorIndex.decodeBER(inputStream);
}
// reusing pduType here to save memory ;-)
pduType = new BER.MutableByte();
int vbLength = BER.decodeHeader(inputStream, pduType);
if (pduType.getValue() != BER.SEQUENCE) {
throw new IOException("Encountered invalid tag, SEQUENCE expected: " + pduType.getValue());
}
// rest read count
int startPos = (int) inputStream.getPosition();
variableBindings = new Vector<>();
while (inputStream.getPosition() - startPos < vbLength) {
VariableBinding vb = new VariableBinding();
vb.decodeBER(inputStream);
if (!isVariableV1(vb.getVariable())) {
throw new MessageException("Counter64 encountered in SNMPv1 PDU " + "(RFC 2576 §4.1.2.1)");
}
variableBindings.add(vb);
}
if (BER.isCheckSequenceLength()) {
BER.checkSequenceLength(vbLength, (int) inputStream.getPosition() - startPos, this);
BER.checkSequenceLength(length, (int) inputStream.getPosition() - pduStartPos, this);
}
}
@Override
protected int getBERPayloadLengthPDU() {
if (getType() != PDU.V1TRAP) {
return super.getBERPayloadLengthPDU();
} else {
int length = 0;
// length for all vbs
for (VariableBinding variableBinding : variableBindings) {
length += variableBinding.getBERLength();
}
length += BER.getBERLengthOfLength(length) + 1;
length += agentAddress.getBERLength();
length += enterprise.getBERLength();
length += genericTrap.getBERLength();
length += specificTrap.getBERLength();
length += timestamp.getBERLength();
return length;
}
}
/**
* Gets the specific trap ID. If this value is set, {@link #getGenericTrap()} must return
* ENTERPRISE_SPECIFIC(6).
*
* @return an integer value > 0.
* @throws UnsupportedOperationException if the type of this PDU is not {@link PDU#V1TRAP}.
*/
public int getSpecificTrap() {
checkV1TRAP();
return specificTrap.getValue();
}
/**
* Gets the generic trap ID. If this value is ENTERPRISE_SPECIFIC(6), then {@link
* #getSpecificTrap()} will return the trap ID of the enterprise specific trap.
*
* @return an Integer32 instance with a value between 0 and 6.
* @throws UnsupportedOperationException if the type of this PDU is not {@link PDU#V1TRAP}.
*/
public int getGenericTrap() {
checkV1TRAP();
return genericTrap.getValue();
}
