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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 static se.leap.bitmaskclient.firewall.FirewallManager.BITMASK_CHAIN;
import static se.leap.bitmaskclient.base.utils.Cmd.runBlockingCmd;
class StartIPv6FirewallTask extends AsyncTask<Void, Boolean, Boolean> {
private WeakReference<FirewallCallback> callbackWeakReference;
StartIPv6FirewallTask(FirewallCallback callback) {
callbackWeakReference = new WeakReference<>(callback);
}
@Override
protected Boolean doInBackground(Void... voids) {
StringBuilder log = new StringBuilder();
String[] bitmaskChain = new String[]{
"su",
"id",
"ip6tables --list " + BITMASK_CHAIN };
try {
boolean hasBitmaskChain = runBlockingCmd(bitmaskChain, log) == 0;
boolean allowSu = log.toString().contains("uid=0");
callbackWeakReference.get().onSuRequested(allowSu);
if (!allowSu) {
return false;
}
boolean success;
log = new StringBuilder();
if (!hasBitmaskChain) {
String[] createChainAndRules = new String[]{
"su",
"ip6tables --new-chain " + BITMASK_CHAIN,
"ip6tables --insert OUTPUT --jump " + BITMASK_CHAIN,
"ip6tables --append " + BITMASK_CHAIN + " -p tcp --jump REJECT",
"ip6tables --append " + BITMASK_CHAIN + " -p udp --jump REJECT"
};
success = runBlockingCmd(createChainAndRules, log) == 0;
Log.d(FirewallManager.TAG, "added " + BITMASK_CHAIN + " to ip6tables: " + success);
Log.d(FirewallManager.TAG, log.toString());
return success;
} else {
String[] addRules = new String[] {
"su",
"ip6tables --append " + BITMASK_CHAIN + " -p tcp --jump REJECT",
"ip6tables --append " + BITMASK_CHAIN + " -p udp --jump REJECT" };
return runBlockingCmd(addRules, 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.onFirewallStarted(result);
}
}
}
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