/**
* 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);
}
}
/**
* 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 <code>TimeTicks</code> value of the trap sender's notion of its sysUpTime value when
* this trap has been generated.
*
* @return a long value.
* @throws UnsupportedOperationException if the type of this PDU is not {@link PDU#V1TRAP}.
*/
public long getTimestamp() {
checkV1TRAP();
return timestamp.getValue();
}