| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.management.jdp; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInputStream; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * JdpPacketReader responsible for reading a packet <p>This class gets a byte |
| * array as it came from a Net, validates it and breaks a part </p> |
| */ |
| public final class JdpPacketReader { |
| |
| private final DataInputStream pkt; |
| private Map<String, String> pmap = null; |
| |
| /** |
| * Create packet reader, extract and check magic and version |
| * |
| * @param packet - packet received from a Net |
| * @throws JdpException |
| */ |
| public JdpPacketReader(byte[] packet) |
| throws JdpException { |
| ByteArrayInputStream bais = new ByteArrayInputStream(packet); |
| pkt = new DataInputStream(bais); |
| |
| try { |
| int magic = pkt.readInt(); |
| JdpGenericPacket.checkMagic(magic); |
| } catch (IOException e) { |
| throw new JdpException("Invalid JDP packet received, bad magic"); |
| } |
| |
| try { |
| short version = pkt.readShort(); |
| JdpGenericPacket.checkVersion(version); |
| } catch (IOException e) { |
| throw new JdpException("Invalid JDP packet received, bad protocol version"); |
| } |
| } |
| |
| /** |
| * Get next entry from packet |
| * |
| * @return the entry |
| * @throws EOFException |
| * @throws JdpException |
| */ |
| public String getEntry() |
| throws EOFException, JdpException { |
| |
| try { |
| short len = pkt.readShort(); |
| // Artificial setting the "len" field to Short.MAX_VALUE may cause a reader to allocate |
| // to much memory. Prevent this possible DOS attack. |
| if (len < 1 && len > pkt.available()) { |
| throw new JdpException("Broken JDP packet. Invalid entry length field."); |
| } |
| |
| byte[] b = new byte[len]; |
| if (pkt.read(b) != len) { |
| throw new JdpException("Broken JDP packet. Unable to read entry."); |
| } |
| return new String(b, "UTF-8"); |
| |
| } catch (EOFException e) { |
| throw e; |
| } catch (UnsupportedEncodingException ex) { |
| throw new JdpException("Broken JDP packet. Unable to decode entry."); |
| } catch (IOException e) { |
| throw new JdpException("Broken JDP packet. Unable to read entry."); |
| } |
| |
| |
| } |
| |
| /** |
| * return packet content as a key/value map |
| * |
| * @return map containing packet entries pair of entries treated as |
| * key,value |
| * @throws IOException |
| * @throws JdpException |
| */ |
| public Map<String, String> getDiscoveryDataAsMap() |
| throws JdpException { |
| // return cached map if possible |
| if (pmap != null) { |
| return pmap; |
| } |
| |
| String key = null, value = null; |
| |
| final Map<String, String> tmpMap = new HashMap<>(); |
| try { |
| while (true) { |
| key = getEntry(); |
| value = getEntry(); |
| tmpMap.put(key, value); |
| } |
| } catch (EOFException e) { |
| // EOF reached on reading value, report broken packet |
| // otherwise ignore it. |
| if (value == null) { |
| throw new JdpException("Broken JDP packet. Key without value." + key); |
| } |
| } |
| |
| pmap = Collections.unmodifiableMap(tmpMap); |
| return pmap; |
| } |
| } |