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//
// Copyright 2017, 2018 Filippo "Fil" Bergamo <fil.bergamo@riseup.net>
//
// This file is part of RepWifiApp.
//
// RepWifiApp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// RepWifiApp is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with RepWifiApp. If not, see <http://www.gnu.org/licenses/>.
//
// ********************************************************************
package fil.libre.repwifiapp.helpers;
import fil.libre.repwifiapp.Commons;
import fil.libre.repwifiapp.Utils;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.util.concurrent.TimeoutException;
public class RootCommand extends ShellCommand {
protected static final String CMD_WRAPPING = "TEMPOUT=\"$(%s)\";ec=$?;echo \"$TEMPOUT\";echo $ec > \"%s\";exit $ec";
//protected static final String CMD_WRAPPING = "TEMPOUT=\"$(%s)\";ec=$?;echo \"$TEMPOUT\";exit $ec";
public RootCommand(String commandText) {
super(commandText);
this._cmdTxt = commandText;
}
public static boolean executeRootCmd(String cmd){
// won't return
try {
return executeRootCmd(cmd, -1);
} catch (TimeoutException e){
// will never throw timeout exception as it won't use asynchronous wait.
return false;
}
}
public static boolean executeRootCmd(String cmd, long timeoutMillis) throws TimeoutException{
try {
RootCommand c = new RootCommand(cmd);
if (c.execute(timeoutMillis) == 0) {
return true;
} else {
return false;
}
}
catch (TimeoutException te){
throw te;
}
catch (Exception e) {
Logger.logError("Error executing \"" + cmd + "\"", e);
return false;
}
}
@Override
public int execute() throws Exception {
return execute(-1);
}
public int execute(long timeoutMillis) throws Exception{
if (this._cmdTxt == null) {
return EXITCODE_INVALID_INPUT;
}
Process su = Runtime.getRuntime().exec("su");
DataOutputStream stdin = new DataOutputStream(su.getOutputStream());
InputStream os = su.getInputStream();
InputStream es = su.getErrorStream();
Logger.logDebug("SU:EXEC: " + this._cmdTxt);
String wrappedCmd = String.format(CMD_WRAPPING, this._cmdTxt, Commons.getExitCodeTempFile());
stdin.writeBytes(wrappedCmd + "\n");
stdin.flush();
StringBuilder sb = new StringBuilder();
sb.append(getStringFromStream(es));
sb.append(getStringFromStream(os));
int res;
if (timeoutMillis <= MIN_TIMEOUT_MILLIS){
res = su.waitFor();
} else {
Logger.logDebug("Executing command with " + timeoutMillis + "ms timeout.");
ProcessTimeout w = new ProcessTimeout();
res = w.waitFor(su, timeoutMillis);
}
// re-read the output, in case it was empty when first tried
sb.append(getStringFromStream(es));
sb.append(getStringFromStream(os));
this._cmdOut = sb.toString();
Logger.logDebug("OUT: " + getOutput());
if (res == 0){
// could be su's own exit code hiding the original one:
res = readLastExitCodeFromFile();
}
Logger.logDebug("ExitCode: " + res);
return res;
}
public int testRootAccess() throws Exception {
Process su = Runtime.getRuntime().exec("su");
DataOutputStream stdin = new DataOutputStream(su.getOutputStream());
Logger.logDebug("Testing root access: executing simple \"su\"");
stdin.writeBytes("exit\n");
stdin.flush();
int res = su.waitFor();
Logger.logDebug("Simple \"su\" exitcode: " + res);
return res;
}
private int readLastExitCodeFromFile(){
String strec = Utils.readFile(Commons.getExitCodeTempFile()).trim();
try{
return Integer.parseInt(strec);
}catch(NumberFormatException e){
Logger.logError("NumberFormatException while parsing contents of ExitCodeTempFile: " + strec);
return EXITCODE_PARSING_ERROR;
}
}
}
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