snmp.rar_SNMP_SNMP 监控_snmp进程监控_基于snmp_网络监控系统

/* * SNMP Package * * Copyright (C) 2004, 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 com.linewell.monitor.snmp; import java.io.*; import java.net.*; /** * The class SNMPv1CommunicationInterface defines methods for communicating with SNMP entities. * The approach is that from version 1 of SNMP, using no encryption of data. Communication occurs * via UDP, using port 161, the standard SNMP port, unless an alternate (non-standard) port is * supplied in the constructor. */ public class SNMPv1CommunicationInterface { public static final int SNMP_PORT = 161; // port to which requests will be sent private int remotePort = SNMP_PORT; // largest size for datagram packet payload; based on // RFC 1157, need to handle messages of at least 484 bytes private int receiveBufferSize = 512; private int version; private InetAddress hostAddress; private String community; DatagramSocket dSocket; public int requestID = 1; /** * Construct a new communication object to communicate with the specified host using the * given community name. The version setting should be either 0 (version 1) or 1 (version 2, * a la RFC 1157). */ public SNMPv1CommunicationInterface(int version, InetAddress hostAddress, String community) throws SocketException { this(version, hostAddress, community, SNMP_PORT); } /** * Construct a new communication object to communicate with the specified host using the * given community name, and sending requests to the specified port. The version setting * should be either 0 (version 1) or 1 (version 2, a la RFC 1157). */ public SNMPv1CommunicationInterface(int version, InetAddress hostAddress, String community, int remotePort) throws SocketException { this.remotePort = remotePort; this.version = version; this.hostAddress = hostAddress; this.community = community; dSocket = new DatagramSocket(); dSocket.setSoTimeout(15000); //15 seconds } /** * Permits setting timeout value for underlying datagram socket (in milliseconds). */ public void setSocketTimeout(int socketTimeout) throws SocketException { dSocket.setSoTimeout(socketTimeout); } /** * Close the "connection" with the device. */ public void closeConnection() throws SocketException { dSocket.close(); } /** * Retrieve all MIB variable values subsequent to the starting object identifier * given in startID (in dotted-integer notation). Return as SNMPVarBindList object. * Uses SNMPGetNextRequests to retrieve variable values in sequence. * @throws IOException Thrown when timeout experienced while waiting for response to request. * @throws SNMPBadValueException */ public SNMPVarBindList retrieveAllMIBInfo(String startID) throws IOException, SNMPBadValueException { // send GetNextRequests until receive // an error message or a repeat of the object identifier we sent out SNMPVarBindList retrievedVars = new SNMPVarBindList(); int errorStatus = 0; int errorIndex = 0; SNMPObjectIdentifier requestedObjectIdentifier = new SNMPObjectIdentifier(startID); SNMPVariablePair nextPair = new SNMPVariablePair(requestedObjectIdentifier, new SNMPNull()); SNMPSequence varList = new SNMPSequence(); varList.addSNMPObject(nextPair); SNMPPDU pdu = new SNMPPDU(SNMPBERCodec.SNMPGETNEXTREQUEST, requestID, errorStatus, errorIndex, varList); SNMPMessage message = new SNMPMessage(version, community, pdu); byte[] messageEncoding = message.getBEREncoding(); DatagramPacket outPacket = new DatagramPacket(messageEncoding, messageEncoding.length, hostAddress, remotePort); dSocket.send(outPacket); while (errorStatus == 0) { DatagramPacket inPacket = new DatagramPacket(new byte[receiveBufferSize], receiveBufferSize); dSocket.receive(inPacket); byte[] encodedMessage = inPacket.getData(); SNMPMessage receivedMessage = new SNMPMessage(SNMPBERCodec.extractNextTLV(encodedMessage,0).value); //errorStatus = ((BigInteger)((SNMPInteger)((receivedMessage.getPDU()).getSNMPObjectAt(1))).getValue()).intValue(); varList = (receivedMessage.getPDU()).getVarBindList(); SNMPSequence newPair = (SNMPSequence)(varList.getSNMPObjectAt(0)); SNMPObjectIdentifier newObjectIdentifier = (SNMPObjectIdentifier)(newPair.getSNMPObjectAt(0)); SNMPObject newValue = newPair.getSNMPObjectAt(1); retrievedVars.addSNMPObject(newPair); if (requestedObjectIdentifier.equals(newObjectIdentifier)) break; requestedObjectIdentifier = newObjectIdentifier; requestID++; nextPair = new SNMPVariablePair(requestedObjectIdentifier, new SNMPNull()); varList = new SNMPSequence(); varList.addSNMPObject(nextPair); pdu = new SNMPPDU(SNMPBERCodec.SNMPGETNEXTREQUEST, requestID, errorStatus, errorIndex, varList); message = new SNMPMessage(version, community, pdu); messageEncoding = message.getBEREncoding(); outPacket = new DatagramPacket(messageEncoding, messageEncoding.length, hostAddress, remotePort); dSocket.send(outPacket); } return retrievedVars; } private String hexByte(byte b) { int pos = b; if (pos < 0) pos += 256; String returnString = new String(); returnString += Integer.toHexString(pos/16); returnString += Integer.toHexString(pos%16); return returnString;