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/**
* Copyright (c) 2020 LEAP Encryption Access Project and contributers
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.leap.bitmaskclient.firewall;
import android.os.AsyncTask;
import android.util.Log;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import se.leap.bitmaskclient.tethering.TetheringObservable;
import se.leap.bitmaskclient.tethering.TetheringState;
import static se.leap.bitmaskclient.firewall.FirewallManager.BITMASK_FORWARD;
import static se.leap.bitmaskclient.firewall.FirewallManager.BITMASK_POSTROUTING;
import static se.leap.bitmaskclient.utils.Cmd.runBlockingCmd;
public class ShutdownTetheringTask extends AsyncTask<Void, Boolean, Boolean> {
private WeakReference<FirewallCallback> callbackWeakReference;
ShutdownTetheringTask(FirewallCallback callback) {
callbackWeakReference = new WeakReference<>(callback);
}
@Override
protected Boolean doInBackground(Void... args) {
TetheringState tetheringState = TetheringObservable.getInstance().getTetheringState();
StringBuilder log = new StringBuilder();
String[] bitmaskChain = new String[]{
"su",
"id",
"iptables -t filter --list " + BITMASK_FORWARD + " && iptables -t nat --list " + BITMASK_POSTROUTING };
try {
boolean hasBitmaskChain = runBlockingCmd(bitmaskChain, log) == 0;
boolean allowSu = log.toString().contains("uid=0");
callbackWeakReference.get().onSuRequested(allowSu);
if (!allowSu) {
return false;
}
log = new StringBuilder();
ArrayList<String> removeChains = new ArrayList<>();
removeChains.add("su");
removeChains.add("ip route flush table 61");
removeChains.add("if [[ `ip rule show from " + tetheringState.lastSeenWifiAddress+ " lookup 61` ]]; " +
"then ip rule del from " + tetheringState.lastSeenWifiAddress + " lookup 61; " +
"fi");
removeChains.add("if [[ `ip rule show from " + tetheringState.lastSeenUsbAddress+ " lookup 61` ]]; " +
"then ip rule del from " + tetheringState.lastSeenUsbAddress + " lookup 61; " +
"fi");
if (hasBitmaskChain) {
removeChains.add("iptables -t filter --delete FORWARD --jump " + BITMASK_FORWARD);
removeChains.add("iptables -t nat --delete POSTROUTING --jump " + BITMASK_POSTROUTING);
removeChains.add("iptables -t filter --flush " + BITMASK_FORWARD);
removeChains.add("iptables -t nat --flush " + BITMASK_POSTROUTING);
removeChains.add("iptables -t filter --delete-chain " + BITMASK_FORWARD);
removeChains.add("iptables -t nat --delete-chain " + BITMASK_POSTROUTING);
}
return runBlockingCmd(removeChains.toArray(new String[0]), log) == 0;
} catch (Exception e) {
e.printStackTrace();
Log.e(FirewallManager.TAG, log.toString());
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
FirewallCallback callback = callbackWeakReference.get();
if (callback != null) {
callback.onTetheringStarted(result);
}
}
}
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