package com.certusnet.videomonitor; import java.util.List;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader; import android.util.Log; /**
* ShellUtils
* <ul>
* <strong>Check root</strong>
* <li>{@link ShellUtils#checkRootPermission()}</li>
* </ul>
* <ul>
* <strong>Execte command</strong>
* <li>{@link ShellUtils#execCommand(String, boolean)}</li>
* <li>{@link ShellUtils#execCommand(String, boolean, boolean)}</li>
* <li>{@link ShellUtils#execCommand(List, boolean)}</li>
* <li>{@link ShellUtils#execCommand(List, boolean, boolean)}</li>
* <li>{@link ShellUtils#execCommand(String[], boolean)}</li>
* <li>{@link ShellUtils#execCommand(String[], boolean, boolean)}</li>
* </ul>
*
* @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> 2013-5-16
*/
public class ShellUtils { public static final String COMMAND_SU = "su";
public static final String COMMAND_SH = "sh";
public static final String COMMAND_EXIT = "exit\n";
public static final String COMMAND_LINE_END = "\n"; private ShellUtils() {
throw new AssertionError();
} /**
* check whether has root permission
*
* @return
*/
public static boolean checkRootPermission() {
return execCommand("echo root", true, false).result == 0;
} /**
* execute shell command, default return result msg
*
* @param command
* command
* @param isRoot
* whether need to run with root
* @return
* @see ShellUtils#execCommand(String[], boolean, boolean)
*/
public static CommandResult execCommand(String command, boolean isRoot) {
return execCommand(new String[] { command }, isRoot, true);
} /**
* execute shell commands, default return result msg
*
* @param commands
* command list
* @param isRoot
* whether need to run with root
* @return
* @see ShellUtils#execCommand(String[], boolean, boolean)
*/
public static CommandResult execCommand(List<String> commands, boolean isRoot) {
return execCommand(commands == null ? null : commands.toArray(new String[] {}), isRoot, true);
} /**
* execute shell commands, default return result msg
*
* @param commands
* command array
* @param isRoot
* whether need to run with root
* @return
* @see ShellUtils#execCommand(String[], boolean, boolean)
*/
public static CommandResult execCommand(String[] commands, boolean isRoot) {
return execCommand(commands, isRoot, true);
} /**
* execute shell command
*
* @param command
* command
* @param isRoot
* whether need to run with root
* @param isNeedResultMsg
* whether need result msg
* @return
* @see ShellUtils#execCommand(String[], boolean, boolean)
*/
public static CommandResult execCommand(String command, boolean isRoot, boolean isNeedResultMsg) {
return execCommand(new String[] { command }, isRoot, isNeedResultMsg);
} /**
* execute shell commands
*
* @param commands
* command list
* @param isRoot
* whether need to run with root
* @param isNeedResultMsg
* whether need result msg
* @return
* @see ShellUtils#execCommand(String[], boolean, boolean)
*/
public static CommandResult execCommand(List<String> commands, boolean isRoot, boolean isNeedResultMsg) {
return execCommand(commands == null ? null : commands.toArray(new String[] {}), isRoot, isNeedResultMsg);
} /**
* execute shell commands
*
* @param commands
* command array
* @param isRoot
* whether need to run with root
* @param isNeedResultMsg
* whether need result msg
* @return <ul>
* <li>if isNeedResultMsg is false, {@link CommandResult#successMsg}
* is null and {@link CommandResult#errorMsg} is null.</li>
* <li>if {@link CommandResult#result} is -1, there maybe some
* excepiton.</li>
* </ul>
*/
public static CommandResult execCommand(String[] commands, boolean isRoot, boolean isNeedResultMsg) {
int result = -1;
if (commands == null || commands.length == 0) {
return new CommandResult(result, null, null);
} Process process = null;
BufferedReader successResult = null;
BufferedReader errorResult = null;
StringBuilder successMsg = null;
StringBuilder errorMsg = null; DataOutputStream os = null;
try {
process = Runtime.getRuntime().exec(isRoot ? COMMAND_SU : COMMAND_SH);
os = new DataOutputStream(process.getOutputStream());
for (String command : commands) {
if (command == null) {
continue;
} // donnot use os.writeBytes(commmand), avoid chinese charset
// error
Log.w("execCommand:", command);
os.write(command.getBytes());
os.writeBytes(COMMAND_LINE_END);
os.flush();
}
os.writeBytes(COMMAND_EXIT);
os.flush(); result = process.waitFor();
// get command result
if (isNeedResultMsg) {
successMsg = new StringBuilder();
errorMsg = new StringBuilder();
successResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
errorResult = new BufferedReader(new InputStreamReader(process.getErrorStream()));
String s;
while ((s = successResult.readLine()) != null) {
successMsg.append(s);
}
while ((s = errorResult.readLine()) != null) {
errorMsg.append(s);
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (os != null) {
os.close();
}
if (successResult != null) {
successResult.close();
}
if (errorResult != null) {
errorResult.close();
}
} catch (IOException e) {
e.printStackTrace();
} if (process != null) {
process.destroy();
}
}
return new CommandResult(result, successMsg == null ? null : successMsg.toString(), errorMsg == null ? null : errorMsg.toString());
} /**
* result of command
* <ul>
* <li>{@link CommandResult#result} means result of command, 0 means normal,
* else means error, same to excute in linux shell</li>
* <li>{@link CommandResult#successMsg} means success message of command
* result</li>
* <li>{@link CommandResult#errorMsg} means error message of command result</li>
* </ul>
*
* @author <a href="http://www.trinea.cn" target="_blank">Trinea</a>
* 2013-5-16
*/
public static class CommandResult { /** result of command **/
public int result;
/** success message of command result **/
public String successMsg;
/** error message of command result **/
public String errorMsg; public CommandResult(int result) {
this.result = result;
} public CommandResult(int result, String successMsg, String errorMsg) {
this.result = result;
this.successMsg = successMsg;
this.errorMsg = errorMsg;
}
}
}
调用，root权限启动mt_hls：
String filePath = getFilesDir().getAbsolutePath() + "/mt_hls";
CommandResult commandResult = ShellUtils.execCommand(new String[] { "cd /data/data/com.certusnet.videomonitor/files \n", "ulimit -c unlimited \n", "chown root " + filePath + " \n", "chmod 777 " + filePath }, true, false);
//CommandResult commandResult = ShellUtils.execCommand(new String[] { "cd /data/data/com.certusnet.videomonitor/files \n", "ulimit -c unlimited \n", "chown root " + filePath + " \n", "chmod 777 " + filePath + " \n", filePath + " -p any -c -f -d" }, true, false);
Log.d("initMonitorProcess", "mawei---" + commandResult.errorMsg + commandResult.result + commandResult.successMsg);
system root权限启动mt_hls：
int ret = system("su -c \"/data/data/com.certusnet.videomonitor/files/mt_hls -c -f -p any -d\"");
注：非root权限的进程，即当前进程无法获取ROOT权限，只能su赋予新独立进程root权限。jni层若果需要root权限，没有办法直接调用。
ioctl 操作驱动文件不需要root权限，但驱动文件必须有可操作权限。
参考：
http://*.com/questions/6983156/android-ioctl-root-permissions-and-usage
http://www.stealthcopter.com/blog/2010/01/android-requesting-root-access-in-your-app/