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From parthchandra <...@git.apache.org>
Subject [GitHub] drill pull request #831: DRILL-5432: Added pcap-format support
Date Tue, 23 May 2017 21:20:51 GMT
Github user parthchandra commented on a diff in the pull request:

    https://github.com/apache/drill/pull/831#discussion_r118107316
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/pcap/decoder/Packet.java
---
    @@ -0,0 +1,371 @@
    +/*
    + * 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.drill.exec.store.pcap.decoder;
    +
    +import com.google.common.base.Preconditions;
    +
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.net.InetAddress;
    +import java.net.UnknownHostException;
    +
    +import static org.apache.drill.exec.store.pcap.Utils.convertInt;
    +import static org.apache.drill.exec.store.pcap.Utils.convertShort;
    +import static org.apache.drill.exec.store.pcap.Utils.getByte;
    +import static org.apache.drill.exec.store.pcap.Utils.getIntFileOrder;
    +import static org.apache.drill.exec.store.pcap.Utils.getShort;
    +
    +public class Packet {
    +  // pcap header
    +  //        typedef struct pcaprec_hdr_s {
    +  //            guint32 ts_sec;         // timestamp seconds
    +  //            guint32 ts_usec;        // timestamp microseconds */
    +  //            guint32 incl_len;       // number of octets of packet saved in file */
    +  //            guint32 orig_len;       // actual length of packet */
    +  //        } pcaprec_hdr_t;
    +  private long timestamp;
    +  private int originalLength;
    +
    +  private byte[] raw;
    +
    +  private int etherOffset;
    +  private int ipOffset;
    +
    +  private int packetLength;
    +  private int etherProtocol;
    +  private int protocol;
    +
    +  private boolean isRoutingV6;
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean readPcap(final InputStream in, final boolean byteOrder, final int maxLength)
throws IOException {
    +    byte[] pcapHeader = new byte[PacketConstants.PCAP_HEADER_SIZE];
    +    int n = in.read(pcapHeader);
    +    if (n < pcapHeader.length) {
    +      return false;
    +    }
    +    decodePcapHeader(pcapHeader, byteOrder, maxLength, 0);
    +
    +    raw = new byte[originalLength];
    +    n = in.read(raw);
    +    if (n < 0) {
    +      return false;
    +    }
    +    etherOffset = 0;
    +
    +    decodeEtherPacket();
    +    return true;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public int decodePcap(final byte[] buffer, final int offset, final boolean byteOrder,
final int maxLength) {
    +    raw = buffer;
    +    etherOffset = offset + PacketConstants.PCAP_HEADER_SIZE;
    +    decodePcapHeader(raw, byteOrder, maxLength, offset);
    +    decodeEtherPacket();
    +    return offset + PacketConstants.PCAP_HEADER_SIZE + originalLength;
    +  }
    +
    +  public String getPacketType() {
    +    if (isTcpPacket()) {
    +      return "TCP";
    +    } else if (isUdpPacket()) {
    +      return "UDP";
    +    } else if (isArpPacket()) {
    +      return "ARP";
    +    } else if (isIcmpPacket()) {
    +      return "ICMP";
    +    } else {
    +      return "unknown";
    +    }
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isIpV4Packet() {
    +    return etherProtocol == PacketConstants.IPv4_TYPE;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isIpV6Packet() {
    +    return etherProtocol == PacketConstants.IPv6_TYPE;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isPPPoV6Packet() {
    +    return etherProtocol == PacketConstants.PPPoV6_TYPE;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isTcpPacket() {
    +    return protocol == PacketConstants.TCP_PROTOCOL;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isUdpPacket() {
    +    return protocol == PacketConstants.UDP_PROTOCOL;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isArpPacket() {
    +    return protocol == PacketConstants.ARP_PROTOCOL;
    +  }
    +
    +  @SuppressWarnings("WeakerAccess")
    +  public boolean isIcmpPacket() {
    +    return protocol == PacketConstants.ICMP_PROTOCOL;
    +  }
    +
    +  public long getSessionHash() {
    +    if (isTcpPacket()) {
    +      Murmur128 h1 = new Murmur128(1, 2);
    +      byte[] buf = getIpAddressBytes(true);
    +      assert buf != null;
    +      h1.hash(buf, 0, buf.length);
    +      h1.hash(getSrc_port());
    +
    +      Murmur128 h2 = new Murmur128(1, 2);
    +      buf = getIpAddressBytes(false);
    +      assert buf != null;
    +      h2.hash(buf, 0, buf.length);
    +      h2.hash(getDst_port());
    +
    +      return h1.digest64() ^ h2.digest64();
    +    } else {
    +      return 0;
    +    }
    +  }
    +
    +  public long getTimestamp() {
    +    return timestamp;
    +  }
    +
    +  public int getPacketLength() {
    +    return packetLength;
    +  }
    +
    +  public InetAddress getSrc_ip() {
    +    return getIPAddress(true);
    +  }
    +
    +  public InetAddress getDst_ip() {
    +    return getIPAddress(false);
    +  }
    +
    +  public String getEthernetSource() {
    +    return getEthernetAddress(PacketConstants.ETHER_SRC_OFFSET);
    +  }
    +
    +  public String getEthernetDestination() {
    +    return getEthernetAddress(PacketConstants.ETHER_DST_OFFSET);
    +  }
    +
    +  public int getSequenceNumber() {
    +    if (isTcpPacket()) {
    +      int sequenceOffset = PacketConstants.ETHER_HEADER_LENGTH + getIPHeaderLength()
+ getTCPHeaderLength(raw) + 4;
    +      return Math.abs(convertInt(raw, sequenceOffset));
    +    } else {
    +      return 0;
    +    }
    +  }
    +
    +  public int getSrc_port() {
    +    if (isPPPoV6Packet()) {
    +      return getPort(64);
    +    }
    +    if (isIpV6Packet()) {
    +      if (isRoutingV6) {
    +        return getPort(136);
    +      }
    +      return getPort(40);
    +    }
    +    return getPort(0);
    +  }
    +
    +  public int getDst_port() {
    +    if (isPPPoV6Packet()) {
    +      return getPort(66);
    +    }
    +    if (isIpV6Packet()) {
    +      if (isRoutingV6) {
    +        return getPort(138);
    +      }
    +      return getPort(42);
    +    }
    +    return getPort(2);
    +  }
    +
    +  public byte[] getData() {
    +    int payloadDataStart = getIPHeaderLength();
    +    if (isTcpPacket()) {
    +      payloadDataStart += this.getTCPHeaderLength(raw);
    +    } else if (isUdpPacket()) {
    +      payloadDataStart += this.getUDPHeaderLength();
    +    } else {
    +      return null;
    +    }
    +    byte[] data = null;
    +    if (packetLength >= payloadDataStart) {
    +      data = new byte[packetLength - payloadDataStart];
    +      System.arraycopy(raw, ipOffset + payloadDataStart, data, 0, data.length);
    +    }
    +    return data;
    +  }
    +
    +  private InetAddress getIPAddress(final boolean src) {
    +    byte[] ipBuffer = getIpAddressBytes(src);
    +    if (ipBuffer == null) {
    +      return null;
    +    }
    +    try {
    +      return InetAddress.getByAddress(ipBuffer);
    +    } catch (UnknownHostException e) {
    +      return null;
    +    }
    +  }
    +
    +  private byte[] getIpAddressBytes(final boolean src) {
    +    int srcPos;
    +    byte[] ipBuffer;
    +    if (isIpV4Packet()) {
    +      ipBuffer = new byte[4];
    +      srcPos = src ? PacketConstants.IP4_SRC_OFFSET : PacketConstants.IP4_DST_OFFSET;
    +    } else if (isIpV6Packet()) {
    +      ipBuffer = new byte[16];
    +      if (isRoutingV6) {
    +        srcPos = src ? PacketConstants.IP6_SRC_OFFSET + 96 : PacketConstants.IP6_DST_OFFSET
+ 96;
    +      } else {
    +        srcPos = src ? PacketConstants.IP6_SRC_OFFSET : PacketConstants.IP6_DST_OFFSET;
    +      }
    +    } else if (isPPPoV6Packet()) {
    +      ipBuffer = new byte[16];
    +      srcPos = src ? PacketConstants.IP6_SRC_OFFSET + PacketConstants.PPPoV6_IP_OFFSET
: PacketConstants.IP6_DST_OFFSET + PacketConstants.PPPoV6_IP_OFFSET;
    +    } else {
    +      return null;
    --- End diff --
    
    What does a null value returned from here mean? An unsupported packet type? If so, caller
should throw an UnsupportedXYZ exception, perhaps?


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