java.lang.Object
- org.opennms.protocols.snmp.SnmpPduPacket

All Implemented Interfaces:

Cloneable, SnmpSyntax

Direct Known Subclasses:

SnmpPduBulk, SnmpPduRequest
```
public abstract class SnmpPduPacket
extends Object
implements SnmpSyntax, Cloneable
```
Base class for all Protocol Data Unit (PDU) implementations. The class defines methods to handle most v1 and v2 implementation of SNMP with only minor work needed by the derived class.

Author:

Brian Weaver

See Also:

SnmpPduRequest, SnmpPduBulk

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`ErrAuthorizationError`	The authorization failed.
`static int`	`ErrBadValue`	If the object type does not match the object value in the agent's tables.
`static int`	`ErrCommitFailed`	Unable to commit the required values.
`static int`	`ErrGenError`	A generic SNMPv1 error occured.
`static int`	`ErrInconsistentName`	The passed object identifier is not consistent.
`static int`	`ErrInconsistentValue`	The specified value are not consistant.
`static int`	`ErrNoAccess`	The specified SET request could not access the specified instance.
`static int`	`ErrNoCreation`	The manager does not have the permission to create the specified object(s).
`static int`	`ErrNoError`	No error occured in the request.
`static int`	`ErrNoSuchName`	There was no such object identifier defined in the agent's tables.
`static int`	`ErrNotWritable`	The specified instance or table is not writable
`static int`	`ErrReadOnly`	Attempting to set a read-only object in the agent's tables.
`static int`	`ErrResourceUnavailable`	The requested resource are not available.
`static int`	`ErrTooBig`	The PDU was too large for the agent to process
`static int`	`ErrUndoFailed`	Unable to perform the undo request
`static int`	`ErrWrongEncoding`	The specified object is not correctly encoded.
`static int`	`ErrWrongLength`	The specified object is not the correct length.
`static int`	`ErrWrongType`	The specified object is not the correct type.
`static int`	`ErrWrongValue`	The specified object doe not have the correct value.
`static int`	`GET`	Defines a SNMPv1 Get Request PDU message.
`static int`	`GETBULK`	Defines a SNMPv2 Get Bulk Request message.
`static int`	`GETNEXT`	Defines a SNMPv1 Get Next Request PDU message.
`static int`	`INFORM`	Defines a SNMPv2 Inform Request message
`protected int`	`m_errIndex`	The error index in a normal pdu, it is used as the maximum repititions in the get bulk pdu.
`protected int`	`m_errStatus`	The error status in a normal pdu, is is used as the non-repeaters in the getbulk.
`static int`	`REPORT`	Defines a SNMPv2 Report message.
`static int`	`RESPONSE`	Defines a SNMPv1 Response PDU message.
`static int`	`SET`	Defines a SNMPv1 PDU Set Request message.
`static int`	`V2TRAP`	Defines a SNMPv2 Trap message

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`SnmpPduPacket()`	Default class constructor.
`protected`	`SnmpPduPacket(int command)`	creates a new pdu with the command set to the passed value.
`protected`	`SnmpPduPacket(int command, SnmpVarBind[] vars)`	Creates a new pdu with the spcified command and the list of variables.
`protected`	`SnmpPduPacket(SnmpPduPacket second)`	Class copy constructor.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addVarBind(SnmpVarBind vb)`	Adds a new variable to the protocol data unit.
`void`	`addVarBindAt(int ndx, SnmpVarBind vb)`	Adds a variable at a specific index.
`abstract Object`	`clone()`	Defined for derived classes to return a duplicate of self.
`int`	`decodeASN(byte[] buf, int offset, AsnEncoder encoder)`	Decodes the protocol data unit from the passed buffer.
`abstract SnmpSyntax`	`duplicate()`	Defined for derived classes to return a duplicate of self.
`int`	`encodeASN(byte[] buf, int offset, AsnEncoder encoder)`	Encodes the protocol data unit using the passed encoder and stores the results in the passed buffer.
`int`	`getCommand()`	Returns the type of PDU.
`int`	`getLength()`	/** Returns the number of variables in the data unit.
`SnmpPeer`	`getPeer()`	Returns the current peer for this packet.
`int`	`getRequestId()`	Returns the current request id for this packet.
`SnmpVarBind`	`getVarBindAt(int ndx)`	Retrieves the variable at the specific index.
`static int`	`nextSequence()`	Use to sequence the all pdu request across the entire library.
`SnmpVarBind`	`removeVarBindAt(int ndx)`	Removes the variable as defined by the index
`void`	`setCommand(int cmd)`	Sets the PDU's current command
`void`	`setPeer(SnmpPeer peer)`	Sets the Peer for the Packet
`void`	`setRequestId(int reqid)`	Sets the protocol data unit's sequence identifer
`void`	`setVarBindAt(int ndx, SnmpVarBind vb)`	Sets the specific variable at the requested location.
`SnmpVarBind[]`	`toVarBindArray()`	Returns a list of all the variables managed by this protocol data unit.
`byte`	`typeId()`	Returns the PDU commmand in an 8-bit format

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - m_errStatus
```
protected int m_errStatus
```
    The error status in a normal pdu, is is used as the non-repeaters in the getbulk.
    
    See Also:
    
    SnmpPduRequest, SnmpPduBulk
  - m_errIndex
```
protected int m_errIndex
```
    The error index in a normal pdu, it is used as the maximum repititions in the get bulk pdu.
    
    See Also:
    
    SnmpPduRequest, SnmpPduBulk
  - GET
```
public static final int GET
```
    Defines a SNMPv1 Get Request PDU message.
    
    See Also:
    
    Constant Field Values
  - GETNEXT
```
public static final int GETNEXT
```
    Defines a SNMPv1 Get Next Request PDU message.
    
    See Also:
    
    Constant Field Values
  - RESPONSE
```
public static final int RESPONSE
```
    Defines a SNMPv1 Response PDU message.
    
    See Also:
    
    Constant Field Values
  - SET
```
public static final int SET
```
    Defines a SNMPv1 PDU Set Request message. The set request uses the write-only string from the session. All others use the read-only community string.
    
    See Also:
    
    Constant Field Values
  - GETBULK
```
public static final int GETBULK
```
    Defines a SNMPv2 Get Bulk Request message.
    
    See Also:
    
    Constant Field Values
  - INFORM
```
public static final int INFORM
```
    Defines a SNMPv2 Inform Request message
    
    See Also:
    
    Constant Field Values
  - V2TRAP
```
public static final int V2TRAP
```
    Defines a SNMPv2 Trap message
    
    See Also:
    
    Constant Field Values
  - REPORT
```
public static final int REPORT
```
    Defines a SNMPv2 Report message.
    
    See Also:
    
    Constant Field Values
  - ErrNoError
```
public static final int ErrNoError
```
    No error occured in the request. Also known as a successful request.
    
    See Also:
    
    Constant Field Values
  - ErrTooBig
```
public static final int ErrTooBig
```
    The PDU was too large for the agent to process
    
    See Also:
    
    Constant Field Values
  - ErrNoSuchName
```
public static final int ErrNoSuchName
```
    There was no such object identifier defined in the agent's tables.
    
    See Also:
    
    Constant Field Values
  - ErrBadValue
```
public static final int ErrBadValue
```
    If the object type does not match the object value in the agent's tables.
    
    See Also:
    
    Constant Field Values
  - ErrReadOnly
```
public static final int ErrReadOnly
```
    Attempting to set a read-only object in the agent's tables.
    
    See Also:
    
    Constant Field Values
  - ErrGenError
```
public static final int ErrGenError
```
    A generic SNMPv1 error occured.
    
    See Also:
    
    Constant Field Values
  - ErrNoAccess
```
public static final int ErrNoAccess
```
    The specified SET request could not access the specified instance.
    
    See Also:
    
    Constant Field Values
  - ErrWrongType
```
public static final int ErrWrongType
```
    The specified object is not the correct type.
    
    See Also:
    
    Constant Field Values
  - ErrWrongLength
```
public static final int ErrWrongLength
```
    The specified object is not the correct length.
    
    See Also:
    
    Constant Field Values
  - ErrWrongEncoding
```
public static final int ErrWrongEncoding
```
    The specified object is not correctly encoded.
    
    See Also:
    
    Constant Field Values
  - ErrWrongValue
```
public static final int ErrWrongValue
```
    The specified object doe not have the correct value.
    
    See Also:
    
    Constant Field Values
  - ErrNoCreation
```
public static final int ErrNoCreation
```
    The manager does not have the permission to create the specified object(s).
    
    See Also:
    
    Constant Field Values
  - ErrInconsistentValue
```
public static final int ErrInconsistentValue
```
    The specified value are not consistant.
    
    See Also:
    
    Constant Field Values
  - ErrResourceUnavailable
```
public static final int ErrResourceUnavailable
```
    The requested resource are not available.
    
    See Also:
    
    Constant Field Values
  - ErrCommitFailed
```
public static final int ErrCommitFailed
```
    Unable to commit the required values.
    
    See Also:
    
    Constant Field Values
  - ErrUndoFailed
```
public static final int ErrUndoFailed
```
    Unable to perform the undo request
    
    See Also:
    
    Constant Field Values
  - ErrAuthorizationError
```
public static final int ErrAuthorizationError
```
    The authorization failed.
    
    See Also:
    
    Constant Field Values
  - ErrNotWritable
```
public static final int ErrNotWritable
```
    The specified instance or table is not writable
    
    See Also:
    
    Constant Field Values
  - ErrInconsistentName
```
public static final int ErrInconsistentName
```
    The passed object identifier is not consistent.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SnmpPduPacket
```
protected SnmpPduPacket()
```
    Default class constructor. Initialzies all primitive members to zero, and allocates a new array list for the variables.
  - SnmpPduPacket
```
protected SnmpPduPacket(SnmpPduPacket second)
```
    Class copy constructor. Constructs the object with all the same values as the passed packet. The variables are duplicated into a new array so that changes to the source pdu will not affect the newly create pdu.
    
    Parameters:
    
    second - The source pdu to copy values from.
  - SnmpPduPacket
```
protected SnmpPduPacket(int command)
```
    creates a new pdu with the command set to the passed value.
    
    Parameters:
    
    command - The type of pdu packet.
  - SnmpPduPacket
```
protected SnmpPduPacket(int command,
                        SnmpVarBind[] vars)
```
    Creates a new pdu with the spcified command and the list of variables.
    
    Parameters:
    
    command - The type of pdu packet.
    
    vars - The variable list for the pdu.
- Method Detail
  - nextSequence
```
public static int nextSequence()
```
    Use to sequence the all pdu request across the entire library. If the sequence id is equal to zero then a random number generator is created and is used to seed the sequence.
    
    Returns:
    
    The new sequnce identifier
  - getCommand
```
public int getCommand()
```
    Returns the type of PDU.
    
    Returns:
    
    The current PDU command
  - setCommand
```
public void setCommand(int cmd)
```
    Sets the PDU's current command
    
    Parameters:
    
    cmd - The new command.
  - getRequestId
```
public int getRequestId()
```
    Returns the current request id for this packet.
    
    Returns:
    
    The sequence identifier
  - setPeer
```
public void setPeer(SnmpPeer peer)
```
    Sets the Peer for the Packet
    
    Parameters:
    
    peer - The peer of this packet
  - getPeer
```
public SnmpPeer getPeer()
```
    Returns the current peer for this packet.
    
    Returns:
    
    The peer or null, if its a own request
  - setRequestId
```
public void setRequestId(int reqid)
```
    Sets the protocol data unit's sequence identifer
    
    Parameters:
    
    reqid - The new request id
  - getLength
```
public int getLength()
```
    /** Returns the number of variables in the data unit.
    
    Returns:
    
    The number of variables.
  - addVarBind
```
public void addVarBind(SnmpVarBind vb)
```
    Adds a new variable to the protocol data unit. The variable is added at the end of the list
    
    Parameters:
    
    vb - The new variable to add
  - addVarBindAt
```
public void addVarBindAt(int ndx,
                         SnmpVarBind vb)
```
    Adds a variable at a specific index.
    
    Parameters:
    
    ndx - The index of the variable
    
    vb - The new variable.
  - getVarBindAt
```
public SnmpVarBind getVarBindAt(int ndx)
```
    Retrieves the variable at the specific index.
    
    Parameters:
    
    ndx - The index of the variable
    
    Returns:
    
    The variable at the specified index
  - setVarBindAt
```
public void setVarBindAt(int ndx,
                         SnmpVarBind vb)
```
    Sets the specific variable at the requested location.
    
    Parameters:
    
    ndx - The location to set
    
    vb - The new variable
  - removeVarBindAt
```
public SnmpVarBind removeVarBindAt(int ndx)
```
    Removes the variable as defined by the index
    
    Parameters:
    
    ndx - The index of the variable to remove
    
    Returns:
    
    The removed variable
  - toVarBindArray
```
public SnmpVarBind[] toVarBindArray()
```
    Returns a list of all the variables managed by this protocol data unit.
    
    Returns:
    
    An array of the internal variable.
  - typeId
```
public byte typeId()
```
    Returns the PDU commmand in an 8-bit format
    
    Specified by:
    
    typeId in interface SnmpSyntax
    
    Returns:
    
    The pdu command
  - encodeASN
```
public int encodeASN(byte[] buf,
                     int offset,
                     AsnEncoder encoder)
              throws AsnEncodingException
```
    Encodes the protocol data unit using the passed encoder and stores the results in the passed buffer. An exception is thrown if an error occurs with the encoding of the information.
    
    Specified by:
    
    encodeASN in interface SnmpSyntax
    
    Parameters:
    
    buf - The buffer to write the encoded information.
    
    offset - The offset to start writing information
    
    encoder - The encoder object.
    
    Returns:
    
    The offset of the byte immediantly after the last encoded byte.
    
    Throws:
    
    AsnEncodingException - Thrown if the encoder finds an error in the buffer.
  - decodeASN
```
public int decodeASN(byte[] buf,
                     int offset,
                     AsnEncoder encoder)
              throws AsnDecodingException
```
    Decodes the protocol data unit from the passed buffer. If an error occurs during the decoding sequence then an AsnDecodingException is thrown by the method. The value is decoded using the AsnEncoder passed to the object.
    
    Specified by:
    
    decodeASN in interface SnmpSyntax
    
    Parameters:
    
    buf - The encode buffer
    
    offset - The offset byte to begin decoding
    
    encoder - The decoder object.
    
    Returns:
    
    The index of the byte immediantly after the last decoded byte of information.
    
    Throws:
    
    AsnDecodingException - Thrown by the encoder if an error occurs trying to decode the data buffer.
  - duplicate
```
public abstract SnmpSyntax duplicate()
```
    Defined for derived classes to return a duplicate of self. This method not defined.
    
    Specified by:
    
    duplicate in interface SnmpSyntax
  - clone
```
public abstract Object clone()
```
    Defined for derived classes to return a duplicate of self. This method not defined.
    
    Overrides:
    
    clone in class Object

Class SnmpPduPacket

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

m_errStatus

m_errIndex

GET

GETNEXT

RESPONSE

SET

GETBULK

INFORM

V2TRAP

REPORT

ErrNoError

ErrTooBig

ErrNoSuchName

ErrBadValue

ErrReadOnly

ErrGenError

ErrNoAccess

ErrWrongType

ErrWrongLength

ErrWrongEncoding

ErrWrongValue

ErrNoCreation

ErrInconsistentValue

ErrResourceUnavailable

ErrCommitFailed

ErrUndoFailed

ErrAuthorizationError

ErrNotWritable

ErrInconsistentName

Constructor Detail

SnmpPduPacket

SnmpPduPacket

SnmpPduPacket

SnmpPduPacket

Method Detail

nextSequence

getCommand

setCommand

getRequestId

setPeer

getPeer

setRequestId

getLength

addVarBind

addVarBindAt

getVarBindAt

setVarBindAt

removeVarBindAt

toVarBindArray

typeId

encodeASN

decodeASN

duplicate

clone