snmptrapsenderinterface.java

基于snmp/mib的网络数据获取系统设计与实现

/*
 * SNMP Package
 *
 * Copyright (C) 2004, Jonathan Sevy <[e-mail]>
 *
 * 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.io.*;
import java.net.*;


/**
*    The class SNMPTrapSenderInterface implements an interface for sending SNMPv1 and SNMPv2 trap messages to a 
*    remote SNMP manager. The approach is that from version 1 of SNMP, using no encryption of data. 
*    Communication occurs via UDP, using port 162, the standard SNMP trap port, as the destination port.
*/

public class SNMPTrapSenderInterface
{
    public static final int SNMP_TRAP_PORT = 162;
    
    private DatagramSocket dSocket;
    
    
    /**
    *    Construct a new trap sender object to send traps to remote SNMP hosts.
    */
    
    public SNMPTrapSenderInterface()
        throws SocketException
    {
        dSocket = new DatagramSocket();
    }
    

    
    /**
    *    Construct a new trap sender object to send traps to remote SNMP hosts, binding to
    *   the specified local port.
    */
    
    public SNMPTrapSenderInterface(int localPort)
        throws SocketException
    {
        dSocket = new DatagramSocket(localPort);
    }
    

    
    /**
    *    Send the supplied SNMPv1 trap pdu to the specified host, using the supplied version number
    *    and community name. Use version = 0 for SNMP version 1, or version = 1 for enhanced 
    *    capabilities provided through RFC 1157.
    */
    
    public void sendTrap(int version, InetAddress hostAddress, String community, SNMPv1TrapPDU pdu)
        throws IOException
    {
        SNMPMessage message = new SNMPMessage(version, community, pdu);
        
        byte[] messageEncoding = message.getBEREncoding();
        
        /*
        System.out.println("Request Message bytes:");
        
        for (int i = 0; i < messageEncoding.length; ++i)
            System.out.print(hexByte(messageEncoding[i]) + " ");
        */
        
        DatagramPacket outPacket = new DatagramPacket(messageEncoding, messageEncoding.length, hostAddress, SNMP_TRAP_PORT);
        
        /*
        System.out.println("Message bytes length (out): " + outPacket.getLength());
        
        System.out.println("Message bytes (out):");
        for (int i = 0; i < messageEncoding.length; ++i)
        {
            System.out.print(hexByte(messageEncoding[i]) + " ");
        }
        System.out.println("\n");
        */
        
        dSocket.send(outPacket);
        
    }
    
    
    
    /**
    *    Send the supplied trap pdu to the specified host, using the supplied community name and
    *    using 0 for the version field in the SNMP message (corresponding to SNMP version 1).
    */
    
    public void sendTrap(InetAddress hostAddress, String community, SNMPv1TrapPDU pdu)
        throws IOException
    {
        int version = 0;
    
        sendTrap(version, hostAddress, community, pdu);
    }
    
    
    
    /**
    *    Send the supplied SNMPv2 trap pdu to the specified host, using the supplied version number
    *    and community name. 
    */
    
    public void sendTrap(int version, InetAddress hostAddress, String community, SNMPv2TrapPDU pdu)
        throws IOException
    {
        SNMPMessage message = new SNMPMessage(version, community, pdu);
        
        byte[] messageEncoding = message.getBEREncoding();
        
        /*
        System.out.println("Request Message bytes:");
        
        for (int i = 0; i < messageEncoding.length; ++i)
            System.out.print(hexByte(messageEncoding[i]) + " ");
        */
        
        DatagramPacket outPacket = new DatagramPacket(messageEncoding, messageEncoding.length, hostAddress, SNMP_TRAP_PORT);
        
        /*
        System.out.println("Message bytes length (out): " + outPacket.getLength());
        
        System.out.println("Message bytes (out):");
        for (int i = 0; i < messageEncoding.length; ++i)
        {
            System.out.print(hexByte(messageEncoding[i]) + " ");
        }
        System.out.println("\n");
        */
        
        dSocket.send(outPacket);
        
    }
    
    
    
    /**
    *    Send the supplied trap pdu to the specified host, using the supplied community name and
    *    using 1 for the version field in the SNMP message.
    */
    
    public void sendTrap(InetAddress hostAddress, String community, SNMPv2TrapPDU pdu)
        throws IOException
    {
        int version = 1;
    
        sendTrap(version, hostAddress, community, pdu);
    }
    
    
    
    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;
    }
    
    
    
    
    
    
    private String getHex(byte theByte)
    {
        int b = theByte;
        
        if (b < 0)
            b += 256;
        
        String returnString = new String(Integer.toHexString(b));
        
        // add leading 0 if needed
        if (returnString.length()%2 == 1)
            returnString = "0" + returnString;
            
        return returnString;
    }
    
    
    
}