Android运行cmd抓取tcpdump包并保存本地

package com.alipay.net;

/**
* Created by xianyu.hxy on 2015/6/9.
*/

import android.content.Context;
import android.content.res.AssetManager;
import android.os.Environment;
import android.text.TextUtils;

import java.io.*;

public class CommandsHelper {
private static final String NAME = "tcpdump";
private static final String TAG = "CommandsHelper";
public static final String DEST_FILE = Environment.getExternalStorageDirectory() + File.separator+"Alipay"+File.separator+"capture.pcap";
public static final String DEST_FILE1="/sdcard/Alipay/capture.pcap";
public static boolean startCapture(Context context) {
InputStream is = null;
OutputStream os = null;
boolean retVal = false;
try {
AssetManager am = context.getAssets();
is = am.open(NAME);
File sdcardFile = Environment.getExternalStorageDirectory();
File dstFile = new File(sdcardFile, NAME);
os = new FileOutputStream(dstFile);

copyStream(is, os);

String[] commands = new String[7];
commands[0] = "adb shell";
commands[1] = "su";
commands[2] = "cp -rf " + dstFile.toString() + " /data/local/tcpdump";
commands[3] = "rm -r " + dstFile.toString();
commands[4] = "chmod 777 /data/local/tcpdump";
commands[5] ="cd /data/local";
commands[6] = "./tcpdump -p -vv -s 0 -w " + DEST_FILE1;

execCmd(commands);
} catch (IOException e) {
e.printStackTrace();

} finally {
closeSafely(is);
closeSafely(os);
}

return retVal;
}

public static void stopCapture(Context context) {
// 找出所有的带有tcpdump的进程
String[] commands = new String[2];
commands[0] = "adb shell";
commands[1] = "ps|grep tcpdump|grep root|awk '{print $2}'";
Process process = execCmd(commands);
String result = parseInputStream(process.getInputStream());
if (!TextUtils.isEmpty(result)) {
String[] pids = result.split("\n");
if (null != pids) {
String[] killCmds = new String[pids.length];
for (int i = 0; i < pids.length; ++i) {
killCmds[i] = "kill -9 " + pids[i];
}
execCmd(killCmds);
}
}
}

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("su\n");

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;
}

private static void copyStream(InputStream is, OutputStream os) {
final int BUFFER_SIZE = 1024;
try {
byte[] bytes = new byte[BUFFER_SIZE];
for (;;) {
int count = is.read(bytes, 0, BUFFER_SIZE);
if (count == -1) {
break;
}

os.write(bytes, 0, count);
}
} catch (IOException e) {
e.printStackTrace();
}
}

private static void closeSafely(Closeable is) {
try {
if (null != is) {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}

private static String parseInputStream(InputStream is) {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = null;
StringBuilder sb = new StringBuilder();
try {
while ( (line = br.readLine()) != null) {
sb.append(line).append("\n");
}
} catch (IOException e) {
e.printStackTrace();
}

return sb.toString();
}
}

Runtime.getRuntime().exec("su\n");执行su的时候会弹出框；手机必须root；执行的tcpdump文件http://i.cnblogs.com/Files.aspx可下载。保存的.pcap文件可用wireshark分析。
非root情况下用fiddler只能获取http请求。