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/*
* Copyright (c) 2012-2016 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.core;
import android.content.Context;
import android.net.LocalServerSocket;
import android.net.LocalSocket;
import android.net.LocalSocketAddress;
import android.os.Handler;
import android.os.ParcelFileDescriptor;
import android.support.annotation.NonNull;
import android.util.Log;
import junit.framework.Assert;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.Locale;
import java.util.Vector;
import de.blinkt.openvpn.BuildConfig;
import de.blinkt.openvpn.R;
import de.blinkt.openvpn.VpnProfile;
public class OpenVpnManagementThread implements Runnable, OpenVPNManagement {
private static final String TAG = "openvpn";
private final Handler mResumeHandler;
private LocalSocket mSocket;
private VpnProfile mProfile;
private OpenVPNService mOpenVPNService;
private LinkedList<FileDescriptor> mFDList = new LinkedList<>();
private LocalServerSocket mServerSocket;
private boolean mWaitingForRelease = false;
private long mLastHoldRelease = 0;
private static final Vector<OpenVpnManagementThread> active = new Vector<>();
private LocalSocket mServerSocketLocal;
private pauseReason lastPauseReason = pauseReason.noNetwork;
private PausedStateCallback mPauseCallback;
private boolean mShuttingDown;
public OpenVpnManagementThread(VpnProfile profile, OpenVPNService openVpnService) {
mProfile = profile;
mOpenVPNService = openVpnService;
mResumeHandler = new Handler(openVpnService.getMainLooper());
}
private Runnable mResumeHoldRunnable = new Runnable() {
@Override
public void run() {
if (shouldBeRunning()) {
releaseHoldCmd();
}
}
};
public boolean openManagementInterface(@NonNull Context c) {
// Could take a while to open connection
int tries = 8;
String socketName = (c.getCacheDir().getAbsolutePath() + "/" + "mgmtsocket");
// The mServerSocketLocal is transferred to the LocalServerSocket, ignore warning
mServerSocketLocal = new LocalSocket();
while (tries > 0 && !mServerSocketLocal.isBound()) {
try {
mServerSocketLocal.bind(new LocalSocketAddress(socketName,
LocalSocketAddress.Namespace.FILESYSTEM));
} catch (IOException e) {
// wait 300 ms before retrying
try {
Thread.sleep(300);
} catch (InterruptedException ignored) {
}
}
tries--;
}
try {
mServerSocket = new LocalServerSocket(mServerSocketLocal.getFileDescriptor());
return true;
} catch (IOException e) {
VpnStatus.logException(e);
}
return false;
}
/**
* @param cmd command to write to management socket
* @return true if command have been sent
*/
public boolean managmentCommand(String cmd) {
try {
if (mSocket != null && mSocket.getOutputStream() != null) {
mSocket.getOutputStream().write(cmd.getBytes());
mSocket.getOutputStream().flush();
return true;
}
} catch (IOException e) {
// Ignore socket stack traces
}
return false;
}
@Override
public void run() {
byte[] buffer = new byte[2048];
// mSocket.setSoTimeout(5); // Setting a timeout cannot be that bad
String pendingInput = "";
synchronized (active) {
active.add(this);
}
try {
// Wait for a client to connect
mSocket = mServerSocket.accept();
InputStream instream = mSocket.getInputStream();
// Close the management socket after client connected
try {
mServerSocket.close();
} catch (IOException e){
VpnStatus.logException(e);
}
// Closing one of the two sockets also closes the other
//mServerSocketLocal.close();
while (true) {
int numbytesread = instream.read(buffer);
if (numbytesread == -1)
return;
FileDescriptor[] fds = null;
try {
fds = mSocket.getAncillaryFileDescriptors();
} catch (IOException e) {
VpnStatus.logException("Error reading fds from socket", e);
}
if (fds != null) {
Collections.addAll(mFDList, fds);
}
String input = new String(buffer, 0, numbytesread, "UTF-8");
pendingInput += input;
pendingInput = processInput(pendingInput);
}
} catch (IOException e) {
if (!e.getMessage().equals("socket closed") && !e.getMessage().equals("Connection reset by peer"))
VpnStatus.logException(e);
}
synchronized (active) {
active.remove(this);
}
}
//! Hack O Rama 2000!
private void protectFileDescriptor(FileDescriptor fd) {
try {
Method getInt = FileDescriptor.class.getDeclaredMethod("getInt$");
int fdint = (Integer) getInt.invoke(fd);
// You can even get more evil by parsing toString() and extract the int from that :)
boolean result = mOpenVPNService.protect(fdint);
if (!result)
VpnStatus.logWarning("Could not protect VPN socket");
//ParcelFileDescriptor pfd = ParcelFileDescriptor.fromFd(fdint);
//pfd.close();
NativeUtils.jniclose(fdint);
return;
} catch (NoSuchMethodException | IllegalArgumentException | InvocationTargetException | IllegalAccessException | NullPointerException e) {
VpnStatus.logException("Failed to retrieve fd from socket (" + fd + ")", e);
}
Log.d("Openvpn", "Failed to retrieve fd from socket: " + fd);
}
private String processInput(String pendingInput) {
while (pendingInput.contains("\n")) {
String[] tokens = pendingInput.split("\\r?\\n", 2);
processCommand(tokens[0]);
if (tokens.length == 1)
// No second part, newline was at the end
pendingInput = "";
else
pendingInput = tokens[1];
}
return pendingInput;
}
private void processCommand(String command) {
//Log.i(TAG, "Line from managment" + command);
if (command.startsWith(">") && command.contains(":")) {
String[] parts = command.split(":", 2);
String cmd = parts[0].substring(1);
String argument = parts[1];
switch (cmd) {
case "INFO":
/* Ignore greeting from management */
return;
case "PASSWORD":
processPWCommand(argument);
break;
case "HOLD":
handleHold(argument);
break;
case "NEED-OK":
processNeedCommand(argument);
break;
case "BYTECOUNT":
processByteCount(argument);
break;
case "STATE":
if (!mShuttingDown)
processState(argument);
break;
case "PROXY":
processProxyCMD(argument);
break;
case "LOG":
processLogMessage(argument);
break;
case "RSA_SIGN":
processSignCommand(argument);
break;
default:
VpnStatus.logWarning("MGMT: Got unrecognized command" + command);
Log.i(TAG, "Got unrecognized command" + command);
break;
}
} else if (command.startsWith("SUCCESS:")) {
/* Ignore this kind of message too */
return;
} else if (command.startsWith("PROTECTFD: ")) {
FileDescriptor fdtoprotect = mFDList.pollFirst();
if (fdtoprotect != null)
protectFileDescriptor(fdtoprotect);
} else {
Log.i(TAG, "Got unrecognized line from managment" + command);
VpnStatus.logWarning("MGMT: Got unrecognized line from management:" + command);
}
}
private void processLogMessage(String argument) {
String[] args = argument.split(",", 4);
// 0 unix time stamp
// 1 log level N,I,E etc.
/*
(b) zero or more message flags in a single string:
I -- informational
F -- fatal error
N -- non-fatal error
W -- warning
D -- debug, and
*/
// 2 log message
Log.d("OpenVPN", argument);
VpnStatus.LogLevel level;
switch (args[1]) {
case "I":
level = VpnStatus.LogLevel.INFO;
break;
case "W":
level = VpnStatus.LogLevel.WARNING;
break;
case "D":
level = VpnStatus.LogLevel.VERBOSE;
break;
case "F":
level = VpnStatus.LogLevel.ERROR;
break;
default:
level = VpnStatus.LogLevel.INFO;
break;
}
int ovpnlevel = Integer.parseInt(args[2]) & 0x0F;
String msg = args[3];
if (msg.startsWith("MANAGEMENT: CMD"))
ovpnlevel = Math.max(4, ovpnlevel);
VpnStatus.logMessageOpenVPN(level, ovpnlevel, msg);
}
boolean shouldBeRunning() {
if (mPauseCallback == null)
return false;
else
return mPauseCallback.shouldBeRunning();
}
private void handleHold(String argument) {
int waittime = Integer.parseInt(argument.split(":")[1]);
if (shouldBeRunning()) {
if (waittime > 1)
VpnStatus.updateStateString("CONNECTRETRY", String.valueOf(waittime),
R.string.state_waitconnectretry, ConnectionStatus.LEVEL_CONNECTING_NO_SERVER_REPLY_YET);
mResumeHandler.postDelayed(mResumeHoldRunnable, waittime * 1000);
if (waittime > 5) {
VpnStatus.logInfo(R.string.state_waitconnectretry, String.valueOf(waittime));
}
} else {
mWaitingForRelease = true;
VpnStatus.updateStatePause(lastPauseReason);
}
}
private void releaseHoldCmd() {
mResumeHandler.removeCallbacks(mResumeHoldRunnable);
if ((System.currentTimeMillis() - mLastHoldRelease) < 5000) {
try {
Thread.sleep(3000);
} catch (InterruptedException ignored) {
}
}
mWaitingForRelease = false;
mLastHoldRelease = System.currentTimeMillis();
managmentCommand("hold release\n");
managmentCommand("bytecount " + mBytecountInterval + "\n");
managmentCommand("state on\n");
//managmentCommand("log on all\n");
}
public void releaseHold() {
if (mWaitingForRelease)
releaseHoldCmd();
}
private void processProxyCMD(String argument) {
String[] args = argument.split(",", 3);
SocketAddress proxyaddr = ProxyDetection.detectProxy(mProfile);
if (args.length >= 2) {
String proto = args[1];
if (proto.equals("UDP")) {
proxyaddr = null;
}
}
if (proxyaddr instanceof InetSocketAddress) {
InetSocketAddress isa = (InetSocketAddress) proxyaddr;
VpnStatus.logInfo(R.string.using_proxy, isa.getHostName(), isa.getPort());
String proxycmd = String.format(Locale.ENGLISH, "proxy HTTP %s %d\n", isa.getHostName(), isa.getPort());
managmentCommand(proxycmd);
} else {
managmentCommand("proxy NONE\n");
}
}
private void processState(String argument) {
String[] args = argument.split(",", 3);
String currentstate = args[1];
if (args[2].equals(",,"))
VpnStatus.updateStateString(currentstate, "");
else
VpnStatus.updateStateString(currentstate, args[2]);
}
private void processByteCount(String argument) {
// >BYTECOUNT:{BYTES_IN},{BYTES_OUT}
int comma = argument.indexOf(',');
long in = Long.parseLong(argument.substring(0, comma));
long out = Long.parseLong(argument.substring(comma + 1));
VpnStatus.updateByteCount(in, out);
}
private void processNeedCommand(String argument) {
int p1 = argument.indexOf('\'');
int p2 = argument.indexOf('\'', p1 + 1);
String needed = argument.substring(p1 + 1, p2);
String extra = argument.split(":", 2)[1];
String status = "ok";
switch (needed) {
case "PROTECTFD":
FileDescriptor fdtoprotect = mFDList.pollFirst();
protectFileDescriptor(fdtoprotect);
break;
case "DNSSERVER":
mOpenVPNService.addDNS(extra);
break;
case "DNSDOMAIN":
mOpenVPNService.setDomain(extra);
break;
case "ROUTE": {
String[] routeparts = extra.split(" ");
/*
buf_printf (&out, "%s %s %s dev %s", network, netmask, gateway, rgi->iface);
else
buf_printf (&out, "%s %s %s", network, netmask, gateway);
*/
if (routeparts.length == 5) {
if (BuildConfig.DEBUG) Assert.assertEquals("dev", routeparts[3]);
mOpenVPNService.addRoute(routeparts[0], routeparts[1], routeparts[2], routeparts[4]);
} else if (routeparts.length >= 3) {
mOpenVPNService.addRoute(routeparts[0], routeparts[1], routeparts[2], null);
} else {
VpnStatus.logError("Unrecognized ROUTE cmd:" + Arrays.toString(routeparts) + " | " + argument);
}
break;
}
case "ROUTE6": {
String[] routeparts = extra.split(" ");
mOpenVPNService.addRoutev6(routeparts[0], routeparts[1]);
break;
}
case "IFCONFIG":
String[] ifconfigparts = extra.split(" ");
int mtu = Integer.parseInt(ifconfigparts[2]);
mOpenVPNService.setLocalIP(ifconfigparts[0], ifconfigparts[1], mtu, ifconfigparts[3]);
break;
case "IFCONFIG6":
mOpenVPNService.setLocalIPv6(extra);
break;
case "PERSIST_TUN_ACTION":
// check if tun cfg stayed the same
status = mOpenVPNService.getTunReopenStatus();
break;
case "OPENTUN":
if (sendTunFD(needed, extra))
return;
else
status = "cancel";
// This not nice or anything but setFileDescriptors accepts only FilDescriptor class :(
break;
default:
Log.e(TAG, "Unknown needok command " + argument);
return;
}
String cmd = String.format("needok '%s' %s\n", needed, status);
managmentCommand(cmd);
}
private boolean sendTunFD(String needed, String extra) {
if (!extra.equals("tun")) {
// We only support tun
VpnStatus.logError(String.format("Device type %s requested, but only tun is possible with the Android API, sorry!", extra));
return false;
}
ParcelFileDescriptor pfd = mOpenVPNService.openTun();
if (pfd == null)
return false;
Method setInt;
int fdint = pfd.getFd();
try {
setInt = FileDescriptor.class.getDeclaredMethod("setInt$", int.class);
FileDescriptor fdtosend = new FileDescriptor();
setInt.invoke(fdtosend, fdint);
FileDescriptor[] fds = {fdtosend};
mSocket.setFileDescriptorsForSend(fds);
// Trigger a send so we can close the fd on our side of the channel
// The API documentation fails to mention that it will not reset the file descriptor to
// be send and will happily send the file descriptor on every write ...
String cmd = String.format("needok '%s' %s\n", needed, "ok");
managmentCommand(cmd);
// Set the FileDescriptor to null to stop this mad behavior
mSocket.setFileDescriptorsForSend(null);
pfd.close();
return true;
} catch (NoSuchMethodException | IllegalArgumentException | InvocationTargetException |
IOException | IllegalAccessException exp) {
VpnStatus.logException("Could not send fd over socket", exp);
}
return false;
}
private void processPWCommand(String argument) {
//argument has the form Need 'Private Key' password
// or ">PASSWORD:Verification Failed: '%s' ['%s']"
String needed;
try {
int p1 = argument.indexOf('\'');
int p2 = argument.indexOf('\'', p1 + 1);
needed = argument.substring(p1 + 1, p2);
if (argument.startsWith("Verification Failed")) {
proccessPWFailed(needed, argument.substring(p2 + 1));
return;
}
} catch (StringIndexOutOfBoundsException sioob) {
VpnStatus.logError("Could not parse management Password command: " + argument);
return;
}
String pw = null;
if (needed.equals("Private Key")) {
pw = mProfile.getPasswordPrivateKey();
} else if (needed.equals("Auth")) {
String usercmd = String.format("username '%s' %s\n",
needed, VpnProfile.openVpnEscape(mProfile.mUsername));
managmentCommand(usercmd);
pw = mProfile.getPasswordAuth();
}
if (pw != null) {
String cmd = String.format("password '%s' %s\n", needed, VpnProfile.openVpnEscape(pw));
managmentCommand(cmd);
} else {
VpnStatus.logError(String.format("Openvpn requires Authentication type '%s' but no password/key information available", needed));
}
}
private void proccessPWFailed(String needed, String args) {
VpnStatus.updateStateString("AUTH_FAILED", needed + args, R.string.state_auth_failed, ConnectionStatus.LEVEL_AUTH_FAILED);
}
private static boolean stopOpenVPN() {
synchronized (active) {
boolean sendCMD = false;
for (OpenVpnManagementThread mt : active) {
sendCMD = mt.managmentCommand("signal SIGINT\n");
try {
if (mt.mSocket != null)
mt.mSocket.close();
} catch (IOException e) {
// Ignore close error on already closed socket
}
}
return sendCMD;
}
}
@Override
public void networkChange(boolean samenetwork) {
if (mWaitingForRelease)
releaseHold();
else if (samenetwork)
managmentCommand("network-change samenetwork\n");
else
managmentCommand("network-change\n");
}
@Override
public void setPauseCallback(PausedStateCallback callback) {
mPauseCallback = callback;
}
public void signalusr1() {
mResumeHandler.removeCallbacks(mResumeHoldRunnable);
if (!mWaitingForRelease)
managmentCommand("signal SIGUSR1\n");
else
// If signalusr1 is called update the state string
// if there is another for stopping
VpnStatus.updateStatePause(lastPauseReason);
}
public void reconnect() {
signalusr1();
releaseHold();
}
private void processSignCommand(String b64data) {
String signed_string = mProfile.getSignedData(b64data);
if (signed_string == null) {
managmentCommand("rsa-sig\n");
managmentCommand("\nEND\n");
stopOpenVPN();
return;
}
managmentCommand("rsa-sig\n");
managmentCommand(signed_string);
managmentCommand("\nEND\n");
}
@Override
public void pause(pauseReason reason) {
lastPauseReason = reason;
signalusr1();
}
@Override
public void resume() {
releaseHold();
/* Reset the reason why we are disconnected */
lastPauseReason = pauseReason.noNetwork;
}
@Override
public boolean stopVPN(boolean replaceConnection) {
boolean stopSucceed = stopOpenVPN();
if (stopSucceed) {
mShuttingDown = true;
}
return stopSucceed;
}
}
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