/**
* Decodes session ID.
*
* @param message - message to get session ID from
* @return Session ID.
*/
public static int decodeSessionID(RmcpMessage message) {
int offset = 2;
if (decodePayloadType(message.getData()[1]) == PayloadType.Oem) {
offset += 6;
}
return decodeSessionID(message.getData(), offset);
}
/**
* Decodes IPMI v2.0 message fields.
*
* @param rmcpMessage - RMCP message to decode.
* @return decoded message
* @see Ipmiv20Message
* @throws IllegalArgumentException when delivered RMCP message does not contain encapsulated IPMI
* message or when AuthCode field is incorrect (integrity check fails).
* @throws InvalidKeyException - when initiation of the integrity algorithm fails
*/
@Override
public IpmiMessage decode(RmcpMessage rmcpMessage)
throws IllegalArgumentException, InvalidKeyException {
Ipmiv20Message message = new Ipmiv20Message(cipherSuite.getConfidentialityAlgorithm());
byte[] raw = rmcpMessage.getData();
message.setAuthenticationType(decodeAuthenticationType(raw[0]));
message.setPayloadEncrypted(decodeEncryption(raw[1]));
message.setPayloadAuthenticated(decodeAuthentication(raw[1]));
message.setPayloadType(decodePayloadType(raw[1]));
int offset = 2;
if (message.getPayloadType() == PayloadType.Oem) {
message.setOemIANA(decodeOEMIANA(raw));
offset += 4;
message.setOemPayloadID(decodeOEMPayloadId(raw, offset));
offset += 2;
}
message.setSessionID(decodeSessionID(raw, offset));
offset += 4;
message.setSessionSequenceNumber(decodeSessionSequenceNumber(raw, offset));
offset += 4;
int payloadLength = decodePayloadLength(raw, offset);
offset += 2;
if (message.isPayloadEncrypted()) {
message.setPayload(
decodePayload(raw, offset, payloadLength, message.getConfidentialityAlgorithm()));
} else {
message.setPayload(decodePayload(raw, offset, payloadLength, new ConfidentialityNone()));
}
offset += payloadLength;
if (message.getAuthenticationType() != AuthenticationType.None
&& !(message.getAuthenticationType() == AuthenticationType.RMCPPlus
&& !message.isPayloadAuthenticated())
&& message.getSessionID() != 0) {
offset = skipIntegrityPAD(raw, offset);
message.setAuthCode(decodeAuthCode(raw, offset));
if (!validateAuthCode(raw, offset)) {
logger.warn("Integrity check failed");
}
}
return message;
}