tcpdump 抓包

tcpdump工具可以在手机上进行抓包，具体步骤可以参考链接：tcpdump抓包。
本文章通过代码结合adb命令在Android手机端进行抓包，具体步骤如下：
1、新建Android工程，将tcpdump工具copy到assets文件中
2、将tcpdump写入到/mnt目录中
3、修改/mnt中tcpdump的权限
4、代码执行adb 命令，操作/mnt中tcpdump工具进行抓包
代码如下：

package com.demo.utils;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import android.content.Context;import android.text.TextUtils;import android.util.Log;public class CommandsHelper {    private static final String NAME = "tcpdump";    private static final String TAG = "CommandsHelper";    public static final String DEST_FILE = "/mnt" + "/capture.pcap";      /**     * 开始抓包     * @param context     * @param tcpDumpFileName     */    public static void startCapture(final Context context,final String tcpDumpFileName) {        new Thread(new Runnable() {            @Override            public void run() {                // TODO Auto-generated method stub                try {                    boolean isCopySus = copyFileFromAssets(context, NAME, "/mnt/tcpdump");                    if(isCopySus){                        String[] commands = new String[5];                        commands[0] = "adb shell";                        commands[1] = "su";                        commands[2] = "chmod 777 /mnt/tcpdump";                        commands[3] = "cd /mnt";                        commands[4] = "tcpdump -p -vv -s 0 -w " + "/mnt" + "/"+tcpDumpFileName+".pcap";                        execCmd(commands);                    }                } catch (IOException e) {                      e.printStackTrace();                      Log.i(TAG, "    error: " + e.getMessage());                  }             }        }).start();    }      public static void stopCapture() {        // 找出所有的带有tcpdump的进程          new Thread(new Runnable() {            @Override            public void run() {                String pid = getPidByPidName("tcpdump");                if(pid != null){                    execCmd(new String[]{"adb shell","su","kill -9 "+pid}, true);                }            }        }).start();    }    public static String getPidByPidName(String PidName){          BufferedReader reader =null;          try{              Process process = Runtime.getRuntime().exec("ps | grep "+PidName);              reader = new BufferedReader(new InputStreamReader(process.getInputStream()));              String line = null;              while((line = reader.readLine())!=null){                  if(line.contains(PidName)){                      String[] strs = line.split("\\s+");                      return strs[1];                  }              }          }catch(Exception e){              e.printStackTrace();          }finally{              if(reader!=null){                  try {                      reader.close();                  } catch (IOException e) {                  }              }          }          return null;      }    public static Process execCmd(String command) {          return execCmd(new String[] { command }, true);      }      public static Process execCmd(String[] commands) {          return execCmd(commands, true);      }      public static Process execCmd(String[] commands, boolean waitFor) {          Process suProcess = null;          try {              suProcess = Runtime.getRuntime().exec("sh");              DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());              for (String cmd : commands) {                  if (!TextUtils.isEmpty(cmd)) {                      os.writeBytes(cmd + "\n");                  }              }              os.flush();              os.writeBytes("exit\n");              os.flush();          } catch (IOException e) {              e.printStackTrace();          }          if (waitFor) {              boolean retval = false;              try {                  int suProcessRetval = suProcess.waitFor();                  if (255 != suProcessRetval) {                      retval = true;                  } else {                      retval = false;                  }              } catch (Exception ex) {                  Log.w("Error ejecutando el comando Root", ex);              }          }          return suProcess;      }    /**     * 从Assets中拷贝文件     * @param context     * @param fileName     * @param path     * @return     */    public static boolean copyFileFromAssets(Context context, String fileName, String path) throws IOException{          boolean copyIsFinish = false;          InputStream is = context.getAssets().open(fileName);          File file = new File(path);          file.createNewFile();          FileOutputStream fos = new FileOutputStream(file);          byte[] temp = new byte[1024];          int i = 0;          while ((i = is.read(temp)) > 0) {              fos.write(temp, 0, i);          }          fos.close();          is.close();          copyIsFinish = true;          return copyIsFinish;      }}

执行代码中startCapture方法进行抓包，stopCapture方法停止抓包。
备注：在具备root权限下抓包可行。
运行有其他问题欢迎留言。
本文参考：http://blog.csdn.net/leehong2005/article/details/20538127