Implement non-root Traceroute on Android---Non-root permission to run binary file script files

author : Wan Jing, the absolute dust

Reprint Please famous source : http://blog.csdn.net/shulianghan/article/details/36438365

Demo Sample code download :

-- CSDN : http://download.csdn.net/detail/han1202012/7639253;

-- GitHub : https://github.com/han1202012/TracerouteAndBusybox;

1. Principles and Ideas

file permission changes cannot be implemented : Suppose No root privileges , you cannot change the file permissions of a binary file;

-- push BusyBox to Android : use adb push command to pass BusyBox to SD card, note that uploading to memory is not possible;

-- upload to SD card success : Use adb push file name in the file full path name command;

[Email protected]:~/csdn$ adb push busybox-armv7l/sdcard/octopus/busybox3256 kb/s (1109128 bytes in 0.332s)

-- failed to upload to memory: Failed to upload to memory using ADB push, because the ADB is using the system user, only the root user has permission to write data to memory;

[Email protected]:~/csdn$ adb push busybox-armv7l/data/busyboxfailed to copy ' busybox-armv7l ' to '/data/busybox ': Permis Sion denied

-- failed to view and change BusyBox permissions: The system user does not have permission to change the SD card file mode;

[Email Protected]:/sdcard/octopus $ ll-rw-rw-r--root     sdcard_rw  1109128 2014-07-08 19:49 busybox[email Protected]:/sdcard/octopus $ chmod 755 busybox                              Unable to chmod busybox:operation not permitted

How to resolve the application :

-- application-specific user : The Android operating system will set a user for each application, and the user has full access to the files under its installation folder (/data/data//);

-- Copy the executable binaries to the installation folder : Place the cross-compiled busybox under the res/assets/folder under the project folder;

2. Implementation Strategy

File Initial placement : The cross-compiled BusyBox file is placed under the/res/assets/folder in the project folder;

file copy : Copy the binary file to the Files folder of the app's installation folder, i.e. under the/data/data/package name/files/;

Change file Permissions : Use the command can directly change the permissions under the folder, note that this operation is able to run;

Run BusyBox : Run in code./data/data/Package Name/files/busybox;

Get run Result:

3. The API used to parse

(1) get the input stream of the Assets folder file

InputStream is = Context.getassets (). open (source);

-- Get Assetsmanager: The Assetsmanager object can be obtained by invoking the Context.getassets () of the context object;

-- Get input stream : Call Assetsmanager's Open (String fileName) to get the input stream of the corresponding file name;

(2) file stream related operations

get file size according to input stream : Call the Inputstream.available () method of the input stream;

int size = is.available ();

to read a file into a buffer: Creates a byte array buffer that is the same size as the file, and the input stream stores the data in the buffer;

byte[] buffer = new Byte[size];is.read (buffer); Is.close ();

write the file into memory : Call the Context object's Openfileoutput (absolute path name, permissions), you can create a file output stream;

FileOutputStream output = context.openfileoutput (destination, context.mode_private); output.write (buffer); O Utput.close ();

(3) Get the absolute path to the file

get the App absolute installation path : Call the Context object's Getfilesdir (). GetAbsolutePath () method;

String Filespath = Context.getfilesdir (). GetAbsolutePath ();

(4) Run binary files

Create a Process object and use the process to run the shell script command :

get Run command-line results:

            InputStream is = Process.getinputstream ();            BufferedReader br = new BufferedReader (new InputStreamReader (IS));            String line = null;              while (line = Br.readline ())! = null) {                  processlist.add (line);             }            

4. Sample Code Demo

mainactivity Main program code :

Package Cn.org.octopus.tracerouteandbusybox;import Java.io.bufferedreader;import java.io.FileNotFoundException; Import Java.io.fileoutputstream;import Java.io.ioexception;import Java.io.inputstream;import Java.io.inputstreamreader;import Java.util.arraylist;import Java.util.list;import Android.content.Context;import Android.os.bundle;import Android.support.v7.app.actionbaractivity;import Android.view.view;import Android.widget.edittext;import android.widget.textview;/** don't understand stare I eat half catty dog food:-) */public class Mainactivity extends actionbaractivity {private EditText et_cmd;private String app_path;private TextView tv_result; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.home_activity); * Initialize Control */et_cmd = (EditText) Findviewbyid (r.id.et_cmd); tv_result = (TextView) Findviewbyid (R.id.tv_result);/* Get the app installation path */app_path = Getapplicationcontext (). Getfilesdir (). GetAbsolutePath (); /** button click event */public void OnClick (view view) {int ID = view.getid (); switch (ID) {case r.id.copy_busybox:/* Copy busybox can run file */varifyfile (Getapplicationcontext (), "BusyBox" ); break;case r.id.copy_traceroute:/* copy traceroute can run file */varifyfile (Getapplicationcontext (), "traceroute"); Case r.id.exe_busybox:/* adds the BusyBox command to editext */string cmd = "." + App_path + "/busybox"; System.out.println (Et_cmd); Et_cmd.settext (cmd); break;case r.id.exe_traceroute:/* add traceroute command to Editext */cmd = " . "+ App_path +"/traceroute 8.8.8.8 "; et_cmd.settext (cmd); Break;case r.id.exe:/* Run editext command */cmd = Et_cmd.gettext (). ToString ();/* Run script command */list<string> results = exe (CMD); string result = "";/* Convert the results to a string, output to TextView */for (string line:results) {result + = line + "\ n";} Tv_result.settext (result); break;default:break;}} /** Verify that the file exists, assuming that it does not exist, copy */private void Varifyfile (context context, String FileName) {try {* * * to see if the file exists, assuming no        The code in the exception will go */context.openfileinput (fileName);        } catch (FileNotFoundException Notfounde) {    try {/* Copy the file to the Files folder of the app installation folder */copyfromassets (context, filename, filename);                /* Change file Permissions script */String script = "chmod" + App_path + "/" + fileName;            /* Run the script */exe (script);            } catch (Exception e) {e.printstacktrace ();  }}}/** copy the file from the assets folder to the Files folder in the app installation folder */private void Copyfromassets (context context, String source,string Destination) throws IOException {/* Gets the input stream of the file under the assets folder */inputstream is = Context.getassets (). open (source);/* Get file size */i NT size = is.available ();/* buffer to create file */byte[] buffer = new byte[size];/* reads the file into the buffer */is.read (buffer);/* Closes the input stream */is.close ( /*/* Open the output stream of the app installation folder file */fileoutputstream output = Context.openfileoutput (destination,context.mode_private);/* Writes the file out of the buffer to the in-memory */output.write (buffer);/* Closes the output stream */output.close ();} /** run Shell script command */private list<string> exe (String cmd) {/* Get run tool */process Process = NULL;/* Store script run knotFruit */list<string> List = new arraylist<string> ();        try {/* Get runtime Environment */Runtime runtime = Runtime.getruntime ();             /* Run the script */process = runtime.exec (cmd);            /* Get input stream for script results */InputStream is = Process.getinputstream ();            BufferedReader br = new BufferedReader (new InputStreamReader (IS));              String line = null;             /* Read the script run result line by row */while (lines = Br.readline ()) = null) {List.add);         } br.close ();          } catch (IOException e) {e.printstacktrace (); } return list;}}

home_activity.xml Layout file code :

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Match_parent "android:layout_height=" match_parent "android:orientation=" vertical " > <linearlayout android:layout_width= "match_parent" android:layout_height= "Wrap_content" and roid:gravity= "center" android:orientation= "Horizontal" > <button android:id= "@+id/copy_busy Box "android:layout_width=" Wrap_content "android:layout_height=" Wrap_content "Android:onc lick= "OnClick" android:text= "copy BusyBox" android:textsize= "7DP" android:textstyle= "bold"/            > <button android:id= "@+id/copy_traceroute" android:layout_width= "Wrap_content"            android:layout_height= "Wrap_content" android:onclick= "OnClick" android:text= "Copy traceroute"       Android:textsize= "7DP"     android:textstyle= "Bold"/> <button android:id= "@+id/exe_busybox" Android:layout_w Idth= "Wrap_content" android:layout_height= "wrap_content" android:onclick= "OnClick" Androi            d:text= "Run BusyBox" android:textsize= "7DP" android:textstyle= "bold"/> <button Android:id= "@+id/exe_traceroute" android:layout_width= "wrap_content" android:layout_height= "Wrap_c            Ontent "android:onclick=" OnClick "android:text=" Run Traceroute "android:textsize=" 7DP " android:textstyle= "Bold"/> </LinearLayout> <linearlayout android:layout_width= "Match_pare            NT "android:layout_height=" wrap_content "android:orientation=" Horizontal "> <edittext            Android:id= "@+id/et_cmd" android:layout_width= "0DP" android:layout_height= "Wrap_content" android:layout_weight="4" android:hint= "Enter the command to run" android:textstyle= "bold"/> <button android:id= " @+id/exe "android:layout_width=" 0DP "android:layout_height=" Wrap_content "Android:layout_            weight= "1" android:onclick= "OnClick" android:text= "Run" android:textsize= "10DP" android:textstyle= "Bold"/> </LinearLayout> <textview android:id= "@+id/tv_result" Android : layout_width= "match_parent" android:layout_height= "match_parent" android:background= "#000000" Androi D:textcolor= "#FFF" android:textsize= "10DP" android:textstyle= "bold"/></linearlayout>

5. Running Results

To run the BusyBox program :

To run the traceroute program :

Demo Sample code download :

-- CSDN : http://download.csdn.net/detail/han1202012/7639253;

-- GitHub : https://github.com/han1202012/TracerouteAndBusybox;

author : Wan Jing, the absolute dust

Reprint Please famous source : http://blog.csdn.net/shulianghan/article/details/36438365

Implement non-root Traceroute on Android---Non-root permission to run binary file script files