| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.commons.net.tftp; |
| |
| import java.net.DatagramPacket; |
| import java.net.InetAddress; |
| |
| /*** |
| * A final class derived from TFTPPacket definiing the TFTP Error |
| * packet type. |
| * <p> |
| * Details regarding the TFTP protocol and the format of TFTP packets can |
| * be found in RFC 783. But the point of these classes is to keep you |
| * from having to worry about the internals. Additionally, only very |
| * few people should have to care about any of the TFTPPacket classes |
| * or derived classes. Almost all users should only be concerned with the |
| * {@link org.apache.commons.net.tftp.TFTPClient} class |
| * {@link org.apache.commons.net.tftp.TFTPClient#receiveFile receiveFile()} |
| * and |
| * {@link org.apache.commons.net.tftp.TFTPClient#sendFile sendFile()} |
| * methods. |
| * |
| * |
| * @see TFTPPacket |
| * @see TFTPPacketException |
| * @see TFTP |
| ***/ |
| |
| public final class TFTPErrorPacket extends TFTPPacket |
| { |
| /*** The undefined error code according to RFC 783, value 0. ***/ |
| public static final int UNDEFINED = 0; |
| |
| /*** The file not found error code according to RFC 783, value 1. ***/ |
| public static final int FILE_NOT_FOUND = 1; |
| |
| /*** The access violation error code according to RFC 783, value 2. ***/ |
| public static final int ACCESS_VIOLATION = 2; |
| |
| /*** The disk full error code according to RFC 783, value 3. ***/ |
| public static final int OUT_OF_SPACE = 3; |
| |
| /*** |
| * The illegal TFTP operation error code according to RFC 783, value 4. |
| ***/ |
| public static final int ILLEGAL_OPERATION = 4; |
| |
| /*** The unknown transfer id error code according to RFC 783, value 5. ***/ |
| public static final int UNKNOWN_TID = 5; |
| |
| /*** The file already exists error code according to RFC 783, value 6. ***/ |
| public static final int FILE_EXISTS = 6; |
| |
| /*** The no such user error code according to RFC 783, value 7. ***/ |
| public static final int NO_SUCH_USER = 7; |
| |
| /*** The error code of this packet. ***/ |
| private final int error; |
| |
| /*** The error message of this packet. ***/ |
| private final String message; |
| |
| /*** |
| * Creates an error packet to be sent to a host at a given port |
| * with an error code and error message. |
| * |
| * @param destination The host to which the packet is going to be sent. |
| * @param port The port to which the packet is going to be sent. |
| * @param error The error code of the packet. |
| * @param message The error message of the packet. |
| ***/ |
| public TFTPErrorPacket(final InetAddress destination, final int port, |
| final int error, final String message) |
| { |
| super(TFTPPacket.ERROR, destination, port); |
| |
| this.error = error; |
| this.message = message; |
| } |
| |
| /*** |
| * Creates an error packet based from a received |
| * datagram. Assumes the datagram is at least length 4, else an |
| * ArrayIndexOutOfBoundsException may be thrown. |
| * |
| * @param datagram The datagram containing the received error. |
| * @throws TFTPPacketException If the datagram isn't a valid TFTP |
| * error packet. |
| ***/ |
| TFTPErrorPacket(final DatagramPacket datagram) throws TFTPPacketException |
| { |
| super(TFTPPacket.ERROR, datagram.getAddress(), datagram.getPort()); |
| int index, length; |
| byte[] data; |
| StringBuilder buffer; |
| |
| data = datagram.getData(); |
| length = datagram.getLength(); |
| |
| if (getType() != data[1]) { |
| throw new TFTPPacketException("TFTP operator code does not match type."); |
| } |
| |
| error = (data[2] & 0xff) << 8 | data[3] & 0xff; |
| |
| if (length < 5) { |
| throw new TFTPPacketException("Bad error packet. No message."); |
| } |
| |
| index = 4; |
| buffer = new StringBuilder(); |
| |
| while (index < length && data[index] != 0) |
| { |
| buffer.append((char)data[index]); |
| ++index; |
| } |
| |
| message = buffer.toString(); |
| } |
| |
| /*** |
| * This is a method only available within the package for |
| * implementing efficient datagram transport by elminating buffering. |
| * It takes a datagram as an argument, and a byte buffer in which |
| * to store the raw datagram data. Inside the method, the data |
| * is set as the datagram's data and the datagram returned. |
| * |
| * @param datagram The datagram to create. |
| * @param data The buffer to store the packet and to use in the datagram. |
| * @return The datagram argument. |
| ***/ |
| @Override |
| DatagramPacket _newDatagram(final DatagramPacket datagram, final byte[] data) |
| { |
| int length; |
| |
| length = message.length(); |
| |
| data[0] = 0; |
| data[1] = (byte)type; |
| data[2] = (byte)((error & 0xffff) >> 8); |
| data[3] = (byte)(error & 0xff); |
| |
| System.arraycopy(message.getBytes(), 0, data, 4, length); |
| |
| data[length + 4] = 0; |
| |
| datagram.setAddress(address); |
| datagram.setPort(port); |
| datagram.setData(data); |
| datagram.setLength(length + 4); |
| |
| return datagram; |
| } |
| |
| |
| /*** |
| * Creates a UDP datagram containing all the TFTP |
| * error packet data in the proper format. |
| * This is a method exposed to the programmer in case he |
| * wants to implement his own TFTP client instead of using |
| * the {@link org.apache.commons.net.tftp.TFTPClient} |
| * class. |
| * Under normal circumstances, you should not have a need to call this |
| * method. |
| * |
| * @return A UDP datagram containing the TFTP error packet. |
| ***/ |
| @Override |
| public DatagramPacket newDatagram() |
| { |
| byte[] data; |
| int length; |
| |
| length = message.length(); |
| |
| data = new byte[length + 5]; |
| data[0] = 0; |
| data[1] = (byte)type; |
| data[2] = (byte)((error & 0xffff) >> 8); |
| data[3] = (byte)(error & 0xff); |
| |
| System.arraycopy(message.getBytes(), 0, data, 4, length); |
| |
| data[length + 4] = 0; |
| |
| return new DatagramPacket(data, data.length, address, port); |
| } |
| |
| |
| /*** |
| * Returns the error code of the packet. |
| * |
| * @return The error code of the packet. |
| ***/ |
| public int getError() |
| { |
| return error; |
| } |
| |
| |
| /*** |
| * Returns the error message of the packet. |
| * |
| * @return The error message of the packet. |
| ***/ |
| public String getMessage() |
| { |
| return message; |
| } |
| |
| /** |
| * For debugging |
| * @since 3.6 |
| */ |
| @Override |
| public String toString() { |
| return super.toString() + " ERR " + error + " " + message; |
| } |
| } |