java抓包后对pcap文件解析示例

这是自己写的简单的解析pcap文件，方便读取pcap文件，大家参考使用吧

InputStream is = DataParser.class.getClassLoader().getResourceAsStream("baidu_cdr.pcap");

Pcap pcap = PcapParser.unpack(is);
is.close();
byte[] t = pcap.getData().get(0).getContent();
byte[] data = Arrays.copyOfRange(t, 42, t.length);

PcapParser.java

复制代码代码如下:

package com.hylanda.pcap;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
* @author zhouqisheng
*
*/
public class PcapParser {

public static Pcap unpack(InputStream is) throws IOException {
  Pcap pcap = null;
  byte[] buffer_4 = new byte[4];
  byte[] buffer_2 = new byte[2];
  pcap = new Pcap();

  PcapHeader header = new PcapHeader();
  int m = is.read(buffer_4);
  if(m != 4){
   return null;
  }
  reverseByteArray(buffer_4);
  header.setMagic(byteArrayToInt(buffer_4, 0));
  m = is.read(buffer_2);
  reverseByteArray(buffer_2);
  header.setMagor_version(byteArrayToShort(buffer_2, 0));
  m = is.read(buffer_2);
  reverseByteArray(buffer_2);
  header.setMinor_version(byteArrayToShort(buffer_2, 0));
  m = is.read(buffer_4);
  reverseByteArray(buffer_4);
  header.setTimezone(byteArrayToInt(buffer_4, 0));
  m = is.read(buffer_4);
  reverseByteArray(buffer_4);
  header.setSigflags(byteArrayToInt(buffer_4, 0));
  m = is.read(buffer_4);
  reverseByteArray(buffer_4);
  header.setSnaplen(byteArrayToInt(buffer_4, 0));
  m = is.read(buffer_4);
  reverseByteArray(buffer_4);
  header.setLinktype(byteArrayToInt(buffer_4, 0));

pcap.setHeader(header);

  List<PcapData> dataList = new ArrayList<PcapData>();
  while (m > 0) {
   PcapData data = new PcapData();
   m = is.read(buffer_4);
   if (m < 0) {
    break;
   }
   reverseByteArray(buffer_4);
   data.setTime_s(byteArrayToInt(buffer_4, 0));
   m = is.read(buffer_4);
   reverseByteArray(buffer_4);
   data.setTime_ms(byteArrayToInt(buffer_4, 0));
   m = is.read(buffer_4);
   reverseByteArray(buffer_4);
   data.setpLength(byteArrayToInt(buffer_4, 0));
   m = is.read(buffer_4);
   reverseByteArray(buffer_4);
   data.setLength(byteArrayToInt(buffer_4, 0));
   byte[] content = new byte[data.getpLength()];
   m = is.read(content);
   data.setContent(content);

dataList.add(data);
}

  pcap.setData(dataList);
  return pcap;
}

private static int byteArrayToInt(byte[] b, int offset) {
  int value = 0;
  for (int i = 0; i < 4; i++) {
   int shift = (4 - 1 - i) * 8;
   value += (b[i + offset] & 0x000000FF) << shift;
  }
  return value;
}

private static short byteArrayToShort(byte[] b, int offset) {
  short value = 0;
  for (int i = 0; i < 2; i++) {
   int shift = (2 - 1 - i) * 8;
   value += (b[i + offset] & 0x000000FF) << shift;
  }
  return value;
}

/**
* 反转数组
* @param arr
*/
private static void reverseByteArray(byte[] arr){
  byte temp;
  int n = arr.length;
  for(int i=0; i<n/2; i++){
   temp = arr[i];
   arr[i] = arr[n-1-i];
   arr[n-1-i] = temp;
  }
}

}

Pcap.java

复制代码代码如下:

/**
*
*/
package com.hylanda.pcap;

import java.util.List;

/**
* @author zhouqisheng
*
*/
public class Pcap {
private PcapHeader header;
    private List<PcapData> data;
public PcapHeader getHeader() {
  return header;
}
public void setHeader(PcapHeader header) {
  this.header = header;
}
public List<PcapData> getData() {
  return data;
}
public void setData(List<PcapData> data) {
  this.d[\J H]\[\NXX[\J[[\JH\[\HH[\N\YOXX[[^[НZ[\H][НZ[\ N\[ XYK\[ [Y^[\XYN\[ XY\HK\[ \XY\N\[ Z[\HK\[ \Z[\N\[ [Y^OHK\[ \[Y^JN\[ YHK\[ \YN\[ \[HK\[ \\[N\[ [\OHK\[ \[\JN]\[NOO]