| /** |
| * 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. |
| */ |
| // $codepro.audit.disable explicitThisUsage, lossOfPrecisionInCast |
| package org.apache.metron.pcap; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.nio.BufferUnderflowException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.log4j.Logger; |
| import org.krakenapps.pcap.PcapOutputStream; |
| import org.krakenapps.pcap.file.GlobalHeader; |
| import org.krakenapps.pcap.packet.PacketHeader; |
| import org.krakenapps.pcap.packet.PcapPacket; |
| import org.krakenapps.pcap.util.Buffer; |
| |
| // TODO: Auto-generated Javadoc |
| /** |
| * The Class PcapByteOutputStream. |
| * |
| * @author sheetal |
| * @version $Revision: 1.0 $ |
| */ |
| public class PcapByteOutputStream implements PcapOutputStream { |
| |
| /** The Constant LOG. */ |
| private static final Logger LOG = Logger |
| .getLogger(PcapByteOutputStream.class); |
| |
| /** The Constant MAX_CACHED_PACKET_NUMBER. */ |
| private static final int MAX_CACHED_PACKET_NUMBER = 1000; |
| |
| /** The cached packet num. */ |
| private int cachedPacketNum = 0; // NOPMD by sheetal on 1/29/14 2:34 PM |
| |
| /** The baos. */ |
| private ByteArrayOutputStream baos; // NOPMD by sheetal on 1/29/14 2:34 PM |
| |
| /** The list. */ |
| private List<Byte> list; // NOPMD by sheetal on 1/29/14 2:34 PM |
| |
| /** |
| * Instantiates a new pcap byte output stream. |
| * |
| * @param baos |
| * the baos |
| */ |
| public PcapByteOutputStream(ByteArrayOutputStream baos) { |
| this.baos = baos; |
| list = new ArrayList<Byte>(); |
| createGlobalHeader(); |
| } |
| |
| /** |
| * Instantiates a new pcap byte output stream. |
| * |
| * @param baos |
| * the baos |
| * @param header |
| * the header |
| */ |
| public PcapByteOutputStream(ByteArrayOutputStream baos, GlobalHeader header) { |
| this.baos = baos; |
| list = new ArrayList<Byte>(); |
| copyGlobalHeader(header); |
| } |
| |
| /** |
| * Creates the global header. |
| */ |
| private void createGlobalHeader() { |
| /* magic number(swapped) */ |
| list.add((byte) 0xd4); |
| list.add((byte) 0xc3); |
| list.add((byte) 0xb2); |
| list.add((byte) 0xa1); |
| |
| /* major version number */ |
| list.add((byte) 0x02); |
| list.add((byte) 0x00); |
| |
| /* minor version number */ |
| list.add((byte) 0x04); |
| list.add((byte) 0x00); |
| |
| /* GMT to local correction */ |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| |
| /* accuracy of timestamps */ |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| |
| /* max length of captured packets, in octets */ |
| list.add((byte) 0xff); |
| list.add((byte) 0xff); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| |
| /* data link type(ethernet) */ |
| list.add((byte) 0x01); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| list.add((byte) 0x00); |
| } |
| |
| /** |
| * Copy global header. |
| * |
| * @param header |
| * the header |
| */ |
| private void copyGlobalHeader(GlobalHeader header) { |
| final byte[] magicNumber = intToByteArray(header.getMagicNumber()); |
| final byte[] majorVersion = shortToByteArray(header.getMajorVersion()); |
| final byte[] minorVersion = shortToByteArray(header.getMinorVersion()); |
| final byte[] zone = intToByteArray(header.getThiszone()); |
| final byte[] sigFigs = intToByteArray(header.getSigfigs()); |
| final byte[] snapLen = intToByteArray(header.getSnaplen()); |
| final byte[] network = intToByteArray(header.getNetwork()); |
| |
| list.add(magicNumber[0]); |
| list.add(magicNumber[1]); |
| list.add(magicNumber[2]); |
| list.add(magicNumber[3]); |
| |
| list.add(majorVersion[1]); |
| list.add(majorVersion[0]); |
| |
| list.add(minorVersion[1]); |
| list.add(minorVersion[0]); |
| |
| list.add(zone[3]); |
| list.add(zone[2]); |
| list.add(zone[1]); |
| list.add(zone[0]); |
| |
| list.add(sigFigs[3]); |
| list.add(sigFigs[2]); |
| list.add(sigFigs[1]); |
| list.add(sigFigs[0]); |
| |
| list.add(snapLen[3]); |
| list.add(snapLen[2]); |
| list.add(snapLen[1]); |
| list.add(snapLen[0]); |
| |
| list.add(network[3]); |
| list.add(network[2]); |
| list.add(network[1]); |
| list.add(network[0]); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.krakenapps.pcap.PcapOutputStream#write(org.krakenapps.pcap.packet |
| * .PcapPacket) |
| */ |
| /** |
| * Method write. |
| * |
| * @param packet |
| * PcapPacket |
| * |
| * |
| * @throws IOException |
| * * @see org.krakenapps.pcap.PcapOutputStream#write(PcapPacket) * @see |
| * org.krakenapps.pcap.PcapOutputStream#write(PcapPacket) |
| */ |
| |
| public void write(PcapPacket packet) throws IOException { |
| PacketHeader packetHeader = packet.getPacketHeader(); |
| |
| int tsSec = packetHeader.getTsSec(); |
| int tsUsec = packetHeader.getTsUsec(); |
| int inclLen = packetHeader.getInclLen(); |
| int origLen = packetHeader.getOrigLen(); |
| |
| addInt(tsSec); |
| addInt(tsUsec); |
| addInt(inclLen); |
| addInt(origLen); |
| |
| Buffer payload = packet.getPacketData(); |
| |
| try { |
| payload.mark(); |
| while (true) { |
| list.add(payload.get()); |
| } |
| } catch (BufferUnderflowException e) { |
| //LOG.debug("Ignorable exception while writing packet", e); |
| payload.reset(); |
| } |
| |
| cachedPacketNum++; |
| if (cachedPacketNum == MAX_CACHED_PACKET_NUMBER) { |
| flush(); |
| } |
| } |
| |
| /** |
| * Adds the int. |
| * |
| * @param number |
| * the number |
| */ |
| private void addInt(int number) { |
| list.add((byte) (number & 0xff)); |
| list.add((byte) ((number & 0xff00) >> 8)); |
| list.add((byte) ((number & 0xff0000) >> 16)); |
| list.add((byte) ((number & 0xff000000) >> 24)); |
| } |
| |
| /** |
| * Int to byte array. |
| * |
| * @param number |
| * the number |
| * |
| * @return the byte[] |
| */ |
| private byte[] intToByteArray(int number) { |
| return new byte[] { (byte) (number >>> 24), (byte) (number >>> 16), |
| (byte) (number >>> 8), (byte) number }; |
| } |
| |
| /** |
| * Short to byte array. |
| * |
| * @param number |
| * the number |
| * |
| * @return the byte[] |
| */ |
| private byte[] shortToByteArray(short number) { |
| return new byte[] { (byte) (number >>> 8), (byte) number }; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.krakenapps.pcap.PcapOutputStream#flush() |
| */ |
| /** |
| * Method flush. |
| * |
| * |
| * @throws IOException |
| * * @see org.krakenapps.pcap.PcapOutputStream#flush() * @see |
| * org.krakenapps.pcap.PcapOutputStream#flush() |
| */ |
| |
| public void flush() throws IOException { |
| byte[] fileBinary = new byte[list.size()]; |
| for (int i = 0; i < fileBinary.length; i++) { |
| fileBinary[i] = list.get(i); |
| } |
| |
| list.clear(); |
| baos.write(fileBinary); |
| cachedPacketNum = 0; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.krakenapps.pcap.PcapOutputStream#close() |
| */ |
| /** |
| * Method close. |
| * |
| * |
| * @throws IOException |
| * * @see org.krakenapps.pcap.PcapOutputStream#close() * @see |
| * org.krakenapps.pcap.PcapOutputStream#close() |
| */ |
| |
| public void close() throws IOException { |
| flush(); |
| baos.close(); // $codepro.audit.disable closeInFinally |
| } |
| } |