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package se.leap.bitmaskclient.firewall;
import android.os.AsyncTask;
import android.util.Log;
import java.lang.ref.WeakReference;
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 ConfigureTetheringTask extends AsyncTask<TetheringState, Boolean, Boolean> {
private WeakReference<FirewallCallback> callbackWeakReference;
ConfigureTetheringTask(FirewallCallback callback) {
callbackWeakReference = new WeakReference<>(callback);
}
@Override
protected Boolean doInBackground(TetheringState... tetheringStates) {
TetheringState tetheringState = tetheringStates[0];
StringBuilder log = new StringBuilder();
String[] bitmaskChain = new String[]{
"su",
"id",
"iptables --list " + BITMASK_FORWARD + " && iptables --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;
}
boolean success;
log = new StringBuilder();
if (hasAnyTetheringEnabled(tetheringState)) {
if (!hasBitmaskChain) {
String[] createChains = new String[]{
"su",
"iptables -t filter --new-chain " + BITMASK_FORWARD,
"iptables -t nat --new-chain " + BITMASK_POSTROUTING,
"iptables -t filter --insert FORWARD --jump " + BITMASK_FORWARD,
"iptables -t nat --insert POSTROUTING --jump " + BITMASK_POSTROUTING,
};
success = runBlockingCmd(createChains, log) == 0;
Log.d(FirewallManager.TAG, "added " + BITMASK_FORWARD + " and " + BITMASK_POSTROUTING+" to iptables: " + success);
Log.d(FirewallManager.TAG, log.toString());
}
String[] addRules = new String[] {
"su",
"iptables -t filter --flush " + BITMASK_FORWARD,
"iptables -t nat --flush " + BITMASK_POSTROUTING,
"iptables -t filter --append " + BITMASK_FORWARD + " --jump ACCEPT",
"iptables -t nat --append " + BITMASK_POSTROUTING + " --jump MASQUERADE" };
return runBlockingCmd(addRules, log) == 0;
} else {
if (!hasBitmaskChain) return true;
String[] removeChains = new String[] {
"su",
"iptables -t filter --delete FORWARD --jump " + BITMASK_FORWARD,
"iptables -t nat --delete POSTROUTING --jump " + BITMASK_POSTROUTING,
"iptables -t filter --flush " + BITMASK_FORWARD,
"iptables -t nat --flush " + BITMASK_POSTROUTING,
"iptables -t filter --delete-chain " + BITMASK_FORWARD,
"iptables -t nat --delete-chain " + BITMASK_POSTROUTING
};
return runBlockingCmd(removeChains, 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.onTetheringConfigured(result);
}
}
private boolean hasAnyTetheringEnabled(TetheringState state) {
return state.isBluetoothTetheringEnabled || state.isUsbTetheringEnabled || state.isWifiTetheringEnabled;
}
}
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