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/*
* SNMP Package
*
* Copyright (C) 2002, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This is free software. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package snmp;
import java.util.*;
/**
* Defines the SNMPMessage class as a special case of SNMPSequence. Defines a
* top-level SNMP message, as per the following definitions from RFC 1157 and
* RFC 1901.
RFC1157-SNMP DEFINITIONS
IMPORTS FROM RFC1155-SMI;
-- top-level message
Message ::=
SEQUENCE {
version -- version-1 for this RFC
INTEGER {
version-1(0)
},
community -- community name
OCTET STRING,
data -- e.g., PDUs if trivial
ANY -- authentication is being used
}
-- From RFC 1901:
COMMUNITY-BASED-SNMPv2 DEFINITIONS ::= BEGIN
-- top-level message
Message ::=
SEQUENCE {
version
INTEGER {
version(1) -- modified from RFC 1157
},
community -- community name
OCTET STRING,
data -- PDUs as defined in [4]
ANY
}
}
END
*/
public class SNMPMessage extends SNMPSequence
{
/**
* Create an SNMP message with specified version, community, and pdu.
* Use version = 0 for SNMP version 1, or version = 1 for enhanced capapbilities
* provided through RFC 1157.
*/
public SNMPMessage(int version, String community, SNMPPDU pdu)
{
super();
Vector contents = new Vector();
contents.insertElementAt(new SNMPInteger(version), 0);
contents.insertElementAt(new SNMPOctetString(community), 1);
contents.insertElementAt(pdu, 2);
try
{
this.setValue(contents);
}
catch (SNMPBadValueException e)
{
// can't happen! all supplied Vector elements are SNMP Object subclasses
}
}
/**
* Create an SNMP message with specified version, community, and trap pdu.
* Use version = 0 for SNMP version 1, or version = 1 for enhanced capapbilities
* provided through RFC 1157.
*/
public SNMPMessage(int version, String community, SNMPTrapPDU pdu)
{
super();
Vector contents = new Vector();
contents.insertElementAt(new SNMPInteger(version), 0);
contents.insertElementAt(new SNMPOctetString(community), 1);
contents.insertElementAt(pdu, 2);
try
{
this.setValue(contents);
}
catch (SNMPBadValueException e)
{
// can't happen! all supplied Vector elements are SNMP Object subclasses
}
}
/**
* Construct an SNMPMessage from a received ASN.1 byte representation.
* @throws SNMPBadValueException Indicates invalid SNMP message encoding supplied.
*/
protected SNMPMessage(byte[] enc)
throws SNMPBadValueException
{
super(enc);
}
/**
* Utility method which returns the PDU contained in the SNMP message. The pdu is the third component
* of the sequence, after the version and community name.
*/
public SNMPPDU getPDU()
throws SNMPBadValueException
{
Vector contents = (Vector)(this.getValue());
Object pdu = contents.elementAt(2);
if (!(pdu instanceof SNMPPDU))
{
throw new SNMPBadValueException("Wrong PDU type in message: expected SNMPPDU, have " + pdu.getClass().toString());
}
return (SNMPPDU)pdu;
}
public SNMPTrapPDU getTrapPDU()
throws SNMPBadValueException
{
Vector contents = (Vector)(this.getValue());
Object pdu = contents.elementAt(2);
if (!(pdu instanceof SNMPTrapPDU))
{
throw new SNMPBadValueException("Wrong PDU type in message: expected SNMPTrapPDU, have " + pdu.getClass().toString());
}
return (SNMPTrapPDU)pdu;
}
}
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