| // 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 rdpclient.debug; |
| |
| import java.util.regex.Pattern; |
| |
| import streamer.BaseElement; |
| import streamer.ByteBuffer; |
| import streamer.Link; |
| |
| /** |
| * Try to determine packet content by it header fingerprint. |
| */ |
| public class PacketSniffer extends BaseElement { |
| |
| protected Pair regexps[] = null; |
| |
| public PacketSniffer(String id, Pair[] regexps) { |
| super(id); |
| this.regexps = regexps; |
| } |
| |
| @Override |
| public void handleData(ByteBuffer buf, Link link) { |
| |
| matchPacket(buf); |
| |
| super.handleData(buf, link); |
| } |
| |
| private void matchPacket(ByteBuffer buf) { |
| String header = buf.toPlainHexString(100); |
| for (Pair pair : regexps) { |
| if (pair.regexp.matcher(header).find()) { |
| System.out.println("[" + this + "] INFO: Packet: " + pair.name + "."); |
| return; |
| } |
| } |
| |
| System.out.println("[" + this + "] INFO: Unknown packet: " + header + "."); |
| } |
| |
| protected static class Pair { |
| String name; |
| Pattern regexp; |
| |
| protected Pair(String name, String regexp) { |
| this.name = name; |
| this.regexp = Pattern.compile("^" + replaceShortcuts(regexp), Pattern.CASE_INSENSITIVE); |
| } |
| |
| private static String replaceShortcuts(String regexp) { |
| String result = regexp; |
| result = result.replaceAll("XX\\*", "([0-9a-fA-F]{2} )*?"); |
| result = result.replaceAll("XX\\?", "([0-9a-fA-F]{2} )?"); |
| result = result.replaceAll("XX", "[0-9a-fA-F]{2}"); |
| return result; |
| } |
| } |
| |
| } |