/*
* @(#)file SnmpV3Message.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 4.12
* @(#)date 01/01/17
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*/
package com.sun.jmx.snmp;
// java imports
//
import java.util.Vector;
import java.net.InetAddress;
// import debug stuff
//
import com.sun.jmx.trace.Trace;
import com.sun.jmx.snmp.internal.SnmpMsgProcessingSubSystem;
import com.sun.jmx.snmp.internal.SnmpSecurityModel;
import com.sun.jmx.snmp.internal.SnmpDecryptedPdu;
import com.sun.jmx.snmp.internal.SnmpSecurityCache;
import com.sun.jmx.snmp.SnmpMsg;
import com.sun.jmx.snmp.SnmpPdu;
import com.sun.jmx.snmp.SnmpStatusException;
import com.sun.jmx.snmp.SnmpTooBigException;
import com.sun.jmx.snmp.SnmpScopedPduBulk;
import com.sun.jmx.snmp.BerException;
import com.sun.jmx.snmp.SnmpScopedPduRequest;
import com.sun.jmx.snmp.BerDecoder;
import com.sun.jmx.snmp.SnmpDefinitions;
import com.sun.jmx.snmp.SnmpEngineId;
import com.sun.jmx.snmp.SnmpScopedPduPacket;
import com.sun.jmx.snmp.BerEncoder;
import com.sun.jmx.snmp.SnmpPduRequestType;
import com.sun.jmx.snmp.SnmpPduBulkType;
/**
* Is a partially decoded representation of an SNMP V3 packet.
* <P>
* This class can be used when developing customized manager or agent.
* <P>
* The <CODE>SnmpV3Message</CODE> class is directly mapped onto the
* message syntax defined in RFC 2572.
* <BLOCKQUOTE>
* <PRE>
* SNMPv3Message ::= SEQUENCE {
* msgVersion INTEGER ( 0 .. 2147483647 ),
* -- administrative parameters
* msgGlobalData HeaderData,
* -- security model-specific parameters
* -- format defined by Security Model
* msgSecurityParameters OCTET STRING,
* msgData ScopedPduData
* }
* HeaderData ::= SEQUENCE {
* msgID INTEGER (0..2147483647),
* msgMaxSize INTEGER (484..2147483647),
*
* msgFlags OCTET STRING (SIZE(1)),
* -- .... ...1 authFlag
* -- .... ..1. privFlag
* -- .... .1.. reportableFlag
* -- Please observe:
* -- .... ..00 is OK, means noAuthNoPriv
* -- .... ..01 is OK, means authNoPriv
* -- .... ..10 reserved, must NOT be used.
* -- .... ..11 is OK, means authPriv
*
* msgSecurityModel INTEGER (1..2147483647)
* }
* </BLOCKQUOTE>
* </PRE>
* <p><b>This API is a Sun Microsystems internal API and is subject
* to change without notice.</b></p>
* @since 1.5
*/
public class SnmpV3Message extends SnmpMsg {
/**
* Message identifier.
*/
public int msgId = 0;
/**
* Message max size the pdu sender can deal with.
*/
public int msgMaxSize = 0;
/**
* Message flags. Reportable flag and security level.</P>
*<PRE>
* -- .... ...1 authFlag
* -- .... ..1. privFlag
* -- .... .1.. reportableFlag
* -- Please observe:
* -- .... ..00 is OK, means noAuthNoPriv
* -- .... ..01 is OK, means authNoPriv
* -- .... ..10 reserved, must NOT be used.
* -- .... ..11 is OK, means authPriv
*</PRE>
*/
public byte msgFlags = 0;
/**
* The security model the security sub system MUST use in order to deal with this pdu (eg: User based Security Model Id = 3).
*/
public int msgSecurityModel = 0;
/**
* The unmarshalled security parameters.
*/
public byte[] msgSecurityParameters = null;
/**
* The context engine Id in which the pdu must be handled (Generaly the local engine Id).
*/
public byte[] contextEngineId = null;
/**
* The context name in which the OID has to be interpreted.
*/
public byte[] contextName = null;
/** The encrypted form of the scoped pdu (Only relevant when dealing with privacy).
*/
public byte[] encryptedPdu = null;
/**
* Constructor.
*
*/
public SnmpV3Message() {
}
/**
* Encodes this message and puts the result in the specified byte array.
* For internal use only.
*
* @param outputBytes An array to receive the resulting encoding.
*
* @exception ArrayIndexOutOfBoundsException If the result does not fit
* into the specified array.
*/
public int encodeMessage(byte[] outputBytes)
throws SnmpTooBigException {
int encodingLength = 0;
if(isTraceOn()) {
trace("encodeMessage", "Can't encode directly V3Message!!!!! Need a SecuritySubSystem");
}
throw new IllegalArgumentException("Can't encode");
}
/**
* Decodes the specified bytes and initializes this message.
* For internal use only.
*
* @param inputBytes The bytes to be decoded.
*
* @exception SnmpStatusException If the specified bytes are not a valid encoding.
*/
public void decodeMessage(byte[] inputBytes, int byteCount)
throws SnmpStatusException {
try {
BerDecoder bdec = new BerDecoder(inputBytes);
bdec.openSequence();
version = bdec.fetchInteger();
bdec.openSequence();
msgId = bdec.fetchInteger();
msgMaxSize = bdec.fetchInteger();
msgFlags = bdec.fetchOctetString()[0];
msgSecurityModel =bdec.fetchInteger();
bdec.closeSequence();
msgSecurityParameters = bdec.fetchOctetString();
if( (msgFlags & SnmpDefinitions.privMask) == 0 ) {
bdec.openSequence();
contextEngineId = bdec.fetchOctetString();
contextName = bdec.fetchOctetString();
data = bdec.fetchAny();
dataLength = data.length;
bdec.closeSequence();
}
else {
encryptedPdu = bdec.fetchOctetString();
}
bdec.closeSequence() ;
}
catch(BerException x) {
x.printStackTrace();
throw new SnmpStatusException("Invalid encoding") ;
}
if(isTraceOn()) {
trace("decodeMessage", "Unmarshalled message : \n" +
"version :" + version + "\n" +
"msgId :" + msgId + "\n" +
"msgMaxSize :" + msgMaxSize + "\n" +
"msgFlags :" + msgFlags + "\n" +
"msgSecurityModel :" + msgSecurityModel + "\n" +
"contextEngineId :" + (contextEngineId == null ? null : SnmpEngineId.createEngineId(contextEngineId)) + "\n" +
"contextName :" + (contextName == null ? null : new String(contextName)) + "\n" +
"data :" + data + "\n" +
"dat len :" + ((data == null) ? 0 : data.length) + "\n" +
"encryptedPdu :" + encryptedPdu + "\n");
}
}
/**
* Returns the associated request Id.
* @param data The flat message.
* @return The request Id.
*/
public int getRequestId(byte[] data) throws SnmpStatusException {
BerDecoder bdec = null;
int msgId = 0;
try {
bdec = new BerDecoder(data);
bdec.openSequence();
bdec.fetchInteger();
bdec.openSequence();
msgId = bdec.fetchInteger();
}catch(BerException x) {
throw new SnmpStatusException("Invalid encoding") ;
}
try {
bdec.closeSequence();
}
catch(BerException x) {
}
return msgId;
}
/**
* Initializes this message with the specified <CODE>pdu</CODE>.
* <P>
* This method initializes the data field with an array of
* <CODE>maxDataLength</CODE> bytes. It encodes the <CODE>pdu</CODE>.
* The resulting encoding is stored in the data field
* and the length of the encoding is stored in <CODE>dataLength</CODE>.
* <p>
* If the encoding length exceeds <CODE>maxDataLength</CODE>,
* the method throws an exception.
*
* @param p The PDU to be encoded.
* @param maxDataLength The maximum length permitted for the data field.
*
* @exception SnmpStatusException If the specified <CODE>pdu</CODE>
* is not valid.
* @exception SnmpTooBigException If the resulting encoding does not fit
* into <CODE>maxDataLength</CODE> bytes.
* @exception ArrayIndexOutOfBoundsException If the encoding exceeds
* <CODE>maxDataLength</CODE>.
*/
public void encodeSnmpPdu(SnmpPdu p,
int maxDataLength)
throws SnmpStatusException, SnmpTooBigException {
SnmpScopedPduPacket pdu = (SnmpScopedPduPacket) p;
if(isTraceOn()) {
trace("encodeSnmpPdu", "Pdu to marshall: \n" +
"security parameters : " + pdu.securityParameters + "\n" +
"type :" + pdu.type + "\n" +
"version :" + pdu.version + "\n" +
"requestId :" + pdu.requestId + "\n" +
"msgId :" + pdu.msgId + "\n" +
"msgMaxSize :" + pdu.msgMaxSize + "\n" +
"msgFlags :" + pdu.msgFlags + "\n" +
"msgSecurityModel :" + pdu.msgSecurityModel + "\n" +
"contextEngineId :" + pdu.contextEngineId + "\n" +
"contextName :" + pdu.contextName + "\n");
}
version = pdu.version;
address = pdu.address;
port = pdu.port;
msgId = pdu.msgId;
msgMaxSize = pdu.msgMaxSize;
msgFlags = pdu.msgFlags;
msgSecurityModel = pdu.msgSecurityModel;
contextEngineId = pdu.contextEngineId;
contextName = pdu.contextName;
securityParameters = pdu.securityParameters;
//
// Allocate the array to receive the encoding.
//
data = new byte[maxDataLength];
//
// Encode the pdu
// Reminder: BerEncoder does backward encoding !
//
try {
BerEncoder benc = new BerEncoder(data) ;
benc.openSequence() ;
encodeVarBindList(benc, pdu.varBindList) ;
switch(pdu.type) {
case pduGetRequestPdu :
case pduGetNextRequestPdu :
case pduInformRequestPdu :
case pduGetResponsePdu :
case pduSetRequestPdu :
case pduV2TrapPdu :
case pduReportPdu :
SnmpPduRequestType reqPdu = (SnmpPduRequestType) pdu;
benc.putInteger(reqPdu.getErrorIndex());
benc.putInteger(reqPdu.getErrorStatus());
benc.putInteger(pdu.requestId);
break;
case pduGetBulkRequestPdu :
SnmpPduBulkType bulkPdu = (SnmpPduBulkType) pdu;
benc.putInteger(bulkPdu.getMaxRepetitions());
benc.putInteger(bulkPdu.getNonRepeaters());
benc.putInteger(pdu.requestId);
break ;
default:
throw new SnmpStatusException("Invalid pdu type " + String.valueOf(pdu.type)) ;
}
benc.closeSequence(pdu.type) ;
dataLength = benc.trim() ;
}
catch(ArrayIndexOutOfBoundsException x) {
throw new SnmpTooBigException() ;
}
}
/**
* Gets the PDU encoded in this message.
* <P>
* This method decodes the data field and returns the resulting PDU.
*
* @return The resulting PDU.
* @exception SnmpStatusException If the encoding is not valid.
*/
public SnmpPdu decodeSnmpPdu()
throws SnmpStatusException {
SnmpScopedPduPacket pdu = null;
BerDecoder bdec = new BerDecoder(data) ;
try {
int type = bdec.getTag() ;
bdec.openSequence(type) ;
switch(type) {
case pduGetRequestPdu :
case pduGetNextRequestPdu :
case pduInformRequestPdu :
case pduGetResponsePdu :
case pduSetRequestPdu :
case pduV2TrapPdu :
case pduReportPdu :
SnmpScopedPduRequest reqPdu = new SnmpScopedPduRequest() ;
reqPdu.requestId = bdec.fetchInteger() ;
reqPdu.setErrorStatus(bdec.fetchInteger());
reqPdu.setErrorIndex(bdec.fetchInteger());
pdu = reqPdu ;
break ;
case pduGetBulkRequestPdu :
SnmpScopedPduBulk bulkPdu = new SnmpScopedPduBulk() ;
bulkPdu.requestId = bdec.fetchInteger() ;
bulkPdu.setNonRepeaters(bdec.fetchInteger());
bulkPdu.setMaxRepetitions(bdec.fetchInteger());
pdu = bulkPdu ;
break ;
default:
throw new SnmpStatusException(snmpRspWrongEncoding) ;
}
pdu.type = type;
pdu.varBindList = decodeVarBindList(bdec);
bdec.closeSequence() ;
} catch(BerException e) {
if (isDebugOn()) {
debug("decodeSnmpPdu", e);
}
throw new SnmpStatusException(snmpRspWrongEncoding);
}
//
// The easy work.
//
pdu.address = address;
pdu.port = port;
pdu.msgFlags = msgFlags;
pdu.version = version;
pdu.msgId = msgId;
pdu.msgMaxSize = msgMaxSize;
pdu.msgSecurityModel = msgSecurityModel;
pdu.contextEngineId = contextEngineId;
pdu.contextName = contextName;
pdu.securityParameters = securityParameters;
if(isTraceOn()) {
trace("decodeSnmpPdu", "Unmarshalled pdu : \n" +
"type :" + pdu.type + "\n" +
"version :" + pdu.version + "\n" +
"requestId :" + pdu.requestId + "\n" +
"msgId :" + pdu.msgId + "\n" +
"msgMaxSize :" + pdu.msgMaxSize + "\n" +
"msgFlags :" + pdu.msgFlags + "\n" +
"msgSecurityModel :" + pdu.msgSecurityModel + "\n" +
"contextEngineId :" + pdu.contextEngineId + "\n" +
"contextName :" + pdu.contextName + "\n");
}
return pdu ;
}
/**
* Dumps this message in a string.
*
* @return The string containing the dump.
*/
public String printMessage() {
StringBuffer sb = new StringBuffer();
sb.append("msgId : " + msgId + "\n");
sb.append("msgMaxSize : " + msgMaxSize + "\n");
sb.append("msgFlags : " + msgFlags + "\n");
sb.append("msgSecurityModel : " + msgSecurityModel + "\n");
if (contextEngineId == null) {
sb.append("contextEngineId : null");
}
else {
sb.append("contextEngineId : {\n");
sb.append(dumpHexBuffer(contextEngineId,
0,
contextEngineId.length));
sb.append("\n}\n");
}
if (contextName == null) {
sb.append("contextName : null");
}
else {
sb.append("contextName : {\n");
sb.append(dumpHexBuffer(contextName,
0,
contextName.length));
sb.append("\n}\n");
}
return sb.append(super.printMessage()).toString();
}
// TRACES & DEBUG
//---------------
boolean isTraceOn() {
return Trace.isSelected(Trace.LEVEL_TRACE, Trace.INFO_SNMP);
}
void trace(String clz, String func, String info) {
Trace.send(Trace.LEVEL_TRACE, Trace.INFO_SNMP, clz, func, info);
}
void trace(String func, String info) {
trace(dbgTag, func, info);
}
boolean isDebugOn() {
return Trace.isSelected(Trace.LEVEL_DEBUG, Trace.INFO_SNMP);
}
void debug(String clz, String func, String info) {
Trace.send(Trace.LEVEL_DEBUG, Trace.INFO_SNMP, clz, func, info);
}
void debug(String clz, String func, Throwable exception) {
Trace.send(Trace.LEVEL_DEBUG, Trace.INFO_SNMP, clz, func, exception);
}
void debug(String func, String info) {
debug(dbgTag, func, info);
}
void debug(String func, Throwable exception) {
debug(dbgTag, func, exception);
}
String dbgTag = "SnmpV3Message";
}
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