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/*
* 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 snmp;
import java.util.*;
/**
* Class to hold IP addresses; special case of SNMP Octet String.
*/
public class SNMPIPAddress extends SNMPOctetString
{
// length limited to 4 octets
/**
* Initialize to 0.0.0.0
*/
public SNMPIPAddress()
{
// initialize to 0.0.0.0
tag = SNMPBERCodec.SNMPIPADDRESS;
data = new byte[4];
for (int i = 0; i < 4; i++)
data[i] = 0;
}
/**
* Used to initialize from a string containing a standard "dotted" IP address.
* @throws SNMPBadValueException Indicates an invalid string supplied: more than 4 components,
* component values not between 0 and 255, etc.
*/
public SNMPIPAddress(String string)
throws SNMPBadValueException
{
tag = SNMPBERCodec.SNMPIPADDRESS;
this.data = parseIPAddress(string);
}
/**
* Used to initialize from the BER encoding, as received in a response from
* an SNMP device responding to an SNMPGetRequest, or from a supplied byte array
* containing the address components.
* @throws SNMPBadValueException Indicates an invalid array supplied: must have length 4.
*/
public SNMPIPAddress(byte[] enc)
throws SNMPBadValueException
{
tag = SNMPBERCodec.SNMPIPADDRESS;
if (enc.length == 4)
{
data = enc;
}
else // wrong size
{
throw new SNMPBadValueException(" IPAddress: bad BER encoding supplied to set value ");
}
}
/**
* Used to set the value from a byte array containing the address.
* @throws SNMPBadValueException Indicates an incorrect object type supplied, or array of
* incorrect size.
*/
public void setValue(Object newAddress)
throws SNMPBadValueException
{
if ((newAddress instanceof byte[]) && (((byte[])newAddress).length == 4))
data = (byte[])newAddress;
else if (newAddress instanceof String)
{
data = parseIPAddress((String)newAddress);
}
else
throw new SNMPBadValueException(" IPAddress: bad data supplied to set value ");
}
/**
* Return pretty-printed IP address.
*/
public String toString()
{
StringBuffer returnStringBuffer = new StringBuffer();
if (data.length > 0)
{
int convert = data[0];
if (convert < 0)
convert += 256;
returnStringBuffer.append(convert);
for (int i = 1; i < data.length; i++)
{
convert = data[i];
if (convert < 0)
convert += 256;
returnStringBuffer.append(".");
returnStringBuffer.append(convert);
}
}
return returnStringBuffer.toString();
}
private byte[] parseIPAddress(String addressString)
throws SNMPBadValueException
{
try
{
StringTokenizer st = new StringTokenizer(addressString, " .");
int size = 0;
while (st.hasMoreTokens())
{
// figure out how many values are in string
size++;
st.nextToken();
}
if (size != 4)
{
throw new SNMPBadValueException(" IPAddress: wrong number of components supplied to set value ");
}
byte[] returnBytes = new byte[size];
st = new StringTokenizer(addressString, " .");
for (int i = 0; i < size; i++)
{
int addressComponent = (Integer.parseInt(st.nextToken()));
if ((addressComponent < 0) || (addressComponent > 255))
throw new SNMPBadValueException(" IPAddress: invalid component supplied to set value ");
returnBytes[i] = (byte)addressComponent;
}
return returnBytes;
}
catch (NumberFormatException e)
{
throw new SNMPBadValueException(" IPAddress: invalid component supplied to set value ");
}
}
}
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