| /** |
| * 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.metron.pcap; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.EOFException; |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.commons.io.FileUtils; |
| import org.apache.log4j.Logger; |
| |
| import org.krakenapps.pcap.packet.PcapPacket; |
| import org.krakenapps.pcap.file.GlobalHeader; |
| |
| // TODO: Auto-generated Javadoc |
| /** |
| * The Class PcapMerger. |
| * |
| * @author sheetal |
| * @version $Revision: 1.0 $ |
| */ |
| public final class PcapMerger { |
| |
| /** The Constant LOG. */ |
| private static final Logger LOG = Logger.getLogger(PcapMerger.class); |
| |
| /** The comparator for PcapPackets */ |
| private static PcapPacketComparator PCAP_PACKET_COMPARATOR = new PcapPacketComparator(); |
| |
| /** |
| * Instantiates a new pcap merger. |
| */ |
| private PcapMerger() { // $codepro.audit.disable emptyMethod |
| } |
| |
| /** |
| * Merge two pcap byte arrays. |
| * |
| * @param baos |
| * the baos |
| * @param pcaps |
| * the pcaps |
| * |
| * @throws IOException |
| * if there is no byte array, no access permission, or other io |
| * related problems. |
| */ |
| // public static void merge(byte[] to, byte[] from) throws IOException { |
| // PcapByteInputStream is = null; |
| // PcapByteOutputStream os = null; |
| // ByteArrayOutputStream baos = null; |
| // try { |
| // is = new PcapByteInputStream(from); |
| // baos = new ByteArrayOutputStream(); |
| // os = new PcapByteOutputStream(baos, is.getGlobalHeader()); |
| // |
| // writePacket(is, os); |
| // } finally { |
| // closeInput(is); |
| // if (baos != null) { |
| // baos.close(); |
| // } |
| // closeOutput(os); |
| // } |
| // } |
| |
| public static void merge(ByteArrayOutputStream baos, List<byte[]> pcaps) |
| throws IOException { |
| PcapByteInputStream is = null; |
| PcapByteOutputStream os = null; |
| ByteArrayOutputStream unsortedBaos = new ByteArrayOutputStream(); |
| |
| try { |
| int i = 1; |
| for (byte[] pcap : pcaps) { |
| is = new PcapByteInputStream(pcap); |
| if (i == 1) { |
| os = new PcapByteOutputStream(unsortedBaos, is.getGlobalHeader()); |
| } |
| |
| writePacket(is, os); |
| i++; |
| closeInput(is); |
| } |
| } finally { |
| if (unsortedBaos != null) { |
| unsortedBaos.close(); |
| } |
| closeOutput(os); |
| sort(baos, unsortedBaos.toByteArray()); |
| } |
| } |
| |
| /** |
| * Merge byte array1 with byte array2, and write to output byte array. It |
| * doesn't hurt original pcap dump byte arrays. |
| * |
| * @param baos |
| * the baos |
| * @param pcaps |
| * the pcaps |
| * |
| * @throws IOException |
| * if there are no source byte arrays, have no read and/or write |
| * permissions, or anything else. |
| */ |
| public static void merge(ByteArrayOutputStream baos, byte[]... pcaps) // $codepro.audit.disable |
| // overloadedMethods |
| throws IOException { |
| merge(baos, Arrays.asList(pcaps)); |
| |
| } |
| |
| /** |
| * Sort the potentially unsorted byte array according to the timestamp |
| * in the packet header |
| * |
| * @param unsortedBytes |
| * a byte array of a pcap file |
| * |
| * @return byte array of a pcap file with packets in cronological order |
| * |
| * @throws IOException |
| * if there are no source byte arrays, have no read and or write |
| * permission, or anything else. |
| */ |
| private static void sort(ByteArrayOutputStream baos, byte[] unsortedBytes) throws IOException { |
| PcapByteInputStream pcapIs = new PcapByteInputStream(unsortedBytes); |
| PcapByteOutputStream pcapOs = new PcapByteOutputStream(baos, pcapIs.getGlobalHeader()); |
| PcapPacket packet; |
| ArrayList<PcapPacket> packetList = new ArrayList<PcapPacket>(); |
| |
| try { |
| while (true) { |
| packet = pcapIs.getPacket(); |
| if (packet == null) |
| break; |
| packetList.add(packet); |
| LOG.debug("Presort packet: " + packet.getPacketHeader().toString()); |
| } |
| } catch (EOFException e) { |
| //LOG.debug("Ignoreable exception in sort", e); |
| } |
| |
| Collections.sort(packetList, PCAP_PACKET_COMPARATOR); |
| for (PcapPacket p : packetList) { |
| pcapOs.write(p); |
| LOG.debug("Postsort packet: " + p.getPacketHeader().toString()); |
| } |
| pcapOs.close(); |
| } |
| |
| /** |
| * Write packet. |
| * |
| * @param is |
| * the is |
| * @param os |
| * the os |
| * |
| * @throws IOException |
| * Signals that an I/O exception has occurred. |
| */ |
| private static void writePacket(PcapByteInputStream is, |
| PcapByteOutputStream os) throws IOException { |
| PcapPacket packet = null; |
| try { |
| while (true) { |
| packet = is.getPacket(); |
| if (packet == null) { |
| break; |
| } |
| os.write(packet); |
| } |
| } catch (EOFException e) { |
| //LOG.debug("Ignorable exception in writePacket", e); |
| } |
| |
| } |
| |
| /** |
| * Close input. |
| * |
| * @param is |
| * the is |
| */ |
| private static void closeInput(PcapByteInputStream is) { |
| if (is == null) { |
| return; |
| } |
| try { |
| is.close(); // $codepro.audit.disable closeInFinally |
| } catch (IOException e) { |
| LOG.error("Failed to close input stream", e); |
| } |
| } |
| |
| /** |
| * Close output. |
| * |
| * @param os |
| * the os |
| */ |
| private static void closeOutput(PcapByteOutputStream os) { |
| if (os == null) { |
| return; |
| } |
| try { |
| os.close(); |
| } catch (IOException e) { |
| LOG.error("Failed to close output stream", e); |
| |
| } |
| } |
| |
| /** |
| * The main method. |
| * |
| * @param args |
| * the arguments |
| * |
| * @throws IOException |
| * Signals that an I/O exception has occurred. |
| */ |
| public static void main(String[] args) throws IOException { |
| byte[] b1 = FileUtils.readFileToByteArray(new File( |
| "/Users/sheetal/Downloads/constructedTcpDump.1.pcap")); |
| byte[] b2 = FileUtils.readFileToByteArray(new File( |
| "/Users/sheetal/Downloads/constructedTcpDump.2.pcap")); |
| byte[] b3 = FileUtils.readFileToByteArray(new File( |
| "/Users/sheetal/Downloads/constructedTcpDump.3.pcap")); |
| |
| ByteArrayOutputStream boas = new ByteArrayOutputStream(); // $codepro.audit.disable |
| // closeWhereCreated |
| PcapMerger.merge(boas, b1, b2, b3); |
| |
| FileUtils.writeByteArrayToFile(new File( |
| "/Users/sheetal/Downloads/constructedTcpDump.automerged.1.2.pcap"), |
| boas.toByteArray(), false); |
| |
| } |
| } |