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/*
* AirportBaseStationConfigurator
*
* Copyright (C) 2000, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package snmp;
import java.util.*;
import java.io.*;
import java.math.*;
/**
* The SNMPPDU class represents an SNMP PDU from RFC 1157, as indicated below. This
* forms the payload of an SNMP message.
-- protocol data units
PDUs ::=
CHOICE {
get-request
GetRequest-PDU,
get-next-request
GetNextRequest-PDU,
get-response
GetResponse-PDU,
set-request
SetRequest-PDU,
trap
Trap-PDU
}
-- PDUs
GetRequest-PDU ::=
[0]
IMPLICIT PDU
GetNextRequest-PDU ::=
[1]
IMPLICIT PDU
GetResponse-PDU ::=
[2]
IMPLICIT PDU
SetRequest-PDU ::=
[3]
IMPLICIT PDU
PDU ::=
SEQUENCE {
request-id
INTEGER,
error-status -- sometimes ignored
INTEGER {
noError(0),
tooBig(1),
noSuchName(2),
badValue(3),
readOnly(4),
genErr(5)
},
error-index -- sometimes ignored
INTEGER,
variable-bindings -- values are sometimes ignored
VarBindList
}
-- variable bindings
VarBind ::=
SEQUENCE {
name
ObjectName,
value
ObjectSyntax
}
VarBindList ::=
SEQUENCE OF
VarBind
END
*/
public class SNMPPDU extends SNMPSequence
{
//protected int type;
/**
* Create a new PDU of the specified type, with given request ID, error status, and error index,
* and containing the supplied SNMP sequence as data.
*/
public SNMPPDU(int pduType, int requestID, int errorStatus, int errorIndex, SNMPSequence varList)
throws SNMPBadValueException
{
super();
Vector contents = new Vector();
type = pduType;
contents.insertElementAt(new SNMPInteger(requestID), 0);
contents.insertElementAt(new SNMPInteger(errorStatus), 1);
contents.insertElementAt(new SNMPInteger(errorIndex), 2);
contents.insertElementAt(varList, 3);
this.setValue(contents);
}
/**
* Create a new PDU of the specified type from the supplied BER encoding.
* @throws SNMPBadValueException Indicates invalid SNMP PDU encoding supplied in enc.
*/
public SNMPPDU(byte[] enc, int pduType)
throws SNMPBadValueException
{
type = pduType;
extractFromBEREncoding(enc);
}
/**
* A utility method that extracts the variable binding list from the pdu. Useful for retrieving
* the set of (object identifier, value) pairs returned in response to a request to an SNMP
* device. The variable binding list is just an SNMP sequence containing the identifier, value pairs.
* @see snmp.SNMPVarBindList
*/
public SNMPSequence getVarBindList()
{
Vector contents = (Vector)(this.getValue());
return (SNMPSequence)(contents.elementAt(3));
}
/**
* A utility method that extracts the request ID number from this PDU.
*/
public int getRequestID()
{
Vector contents = (Vector)(this.getValue());
return ((BigInteger)((SNMPInteger)(contents.elementAt(0))).getValue()).intValue();
}
/**
* A utility method that extracts the error status for this PDU; if nonzero, can get index of
* problematic variable using getErrorIndex().
*/
public int getErrorStatus()
{
Vector contents = (Vector)(this.getValue());
return ((BigInteger)((SNMPInteger)(contents.elementAt(1))).getValue()).intValue();
}
/**
* A utility method that returns the error index for this PDU, identifying the problematic variable.
*/
public int getErrorIndex()
{
Vector contents = (Vector)(this.getValue());
return ((BigInteger)((SNMPInteger)(contents.elementAt(2))).getValue()).intValue();
}
}
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