protected synchronized void installAndConfigureFiles() throws IOException, InterruptedException {
onionProxyContext.installFiles();
if (!setExecutable(onionProxyContext.getTorExecutableFile())) {
throw new RuntimeException("could not make Tor executable.");
}
// We need to edit the config file to specify exactly where the cookie/geoip files should be
// stored, on
// Android this is always a fixed location relative to the configFiles which is why this extra
// step
// wasn't needed in Briar's Android code. But in Windows it ends up in the user's
// AppData/Roaming. Rather
// than track it down we just tell Tor where to put it.
PrintWriter printWriter = null;
try {
printWriter =
new PrintWriter(
new BufferedWriter(new FileWriter(onionProxyContext.getTorrcFile(), true)));
printWriter.println("CookieAuthFile " + onionProxyContext.getCookieFile().getAbsolutePath());
// For some reason the GeoIP's location can only be given as a file name, not a path and it
// has
// to be in the data directory so we need to set both
printWriter.println(
"DataDirectory " + onionProxyContext.getWorkingDirectory().getAbsolutePath());
printWriter.println("GeoIPFile " + onionProxyContext.getGeoIpFile().getName());
printWriter.println("GeoIPv6File " + onionProxyContext.getGeoIpv6File().getName());
} finally {
if (printWriter != null) {
printWriter.close();
}
}
}
/**
* Installs all necessary files and starts the Tor OP in offline mode (e.g.
* networkEnabled(false)). This would only be used if you wanted to start the Tor OP so that the
* install and related is all done but aren't ready to actually connect it to the network.
*
* @return True if all files installed and Tor OP successfully started
* @throws java.io.IOException - IO Exceptions
* @throws java.lang.InterruptedException - If we are, well, interrupted
*/
public synchronized boolean installAndStartTorOp() throws IOException, InterruptedException {
// The Tor OP will die if it looses the connection to its socket so if there is no controlSocket
// defined
// then Tor is dead. This assumes, of course, that takeOwnership works and we can't end up with
// Zombies.
if (controlConnection != null) {
LOG.info("Tor is already running");
return true;
}
// The code below is why this method is synchronized, we don't want two instances of it running
// at once
// as the result would be a mess of screwed up files and connections.
LOG.info("Tor is not running");
installAndConfigureFiles();
LOG.info("Starting Tor");
File cookieFile = onionProxyContext.getCookieFile();
if (cookieFile.getParentFile().exists() == false
&& cookieFile.getParentFile().mkdirs() == false) {
throw new RuntimeException("Could not create cookieFile parent directory");
}
// The original code from Briar watches individual files, not a directory and Android's file
// observer
// won't work on files that don't exist. Rather than take 5 seconds to rewrite Briar's code I
// instead
// just make sure the file exists
if (cookieFile.exists() == false && cookieFile.createNewFile() == false) {
throw new RuntimeException("Could not create cookieFile");
}
File workingDirectory = onionProxyContext.getWorkingDirectory();
// Watch for the auth cookie file being created/updated
WriteObserver cookieObserver = onionProxyContext.generateWriteObserver(cookieFile);
// Start a new Tor process
String torPath = onionProxyContext.getTorExecutableFile().getAbsolutePath();
String configPath = onionProxyContext.getTorrcFile().getAbsolutePath();
String pid = onionProxyContext.getProcessId();
String[] cmd = {torPath, "-f", configPath, OWNER, pid};
String[] env = onionProxyContext.getEnvironmentArgsForExec();
ProcessBuilder processBuilder = new ProcessBuilder(cmd);
onionProxyContext.setEnvironmentArgsAndWorkingDirectoryForStart(processBuilder);
Process torProcess = null;
try {
// torProcess = Runtime.getRuntime().exec(cmd, env, workingDirectory);
torProcess = processBuilder.start();
CountDownLatch controlPortCountDownLatch = new CountDownLatch(1);
eatStream(torProcess.getInputStream(), false, controlPortCountDownLatch);
eatStream(torProcess.getErrorStream(), true, null);
// On platforms other than Windows we run as a daemon and so we need to wait for the process
// to detach
// or exit. In the case of Windows the equivalent is running as a service and unfortunately
// that requires
// managing the service, such as turning it off or uninstalling it when it's time to move on.
// Any number
// of errors can prevent us from doing the cleanup and so we would leave the process running
// around. Rather
// than do that on Windows we just let the process run on the exec and hence don't look for an
// exit code.
// This does create a condition where the process has exited due to a problem but we should
// hopefully
// detect that when we try to use the control connection.
if (OsData.getOsType() != OsData.OsType.Windows) {
int exit = torProcess.waitFor();
torProcess = null;
if (exit != 0) {
LOG.warn("Tor exited with value " + exit);
return false;
}
}
// Wait for the auth cookie file to be created/updated
if (!cookieObserver.poll(COOKIE_TIMEOUT, MILLISECONDS)) {
LOG.warn("Auth cookie not created");
FileUtilities.listFilesToLog(workingDirectory);
return false;
}
// Now we should be able to connect to the new process
controlPortCountDownLatch.await();
controlSocket = new Socket("127.0.0.1", control_port);
// Open a control connection and authenticate using the cookie file
TorControlConnection controlConnection = new TorControlConnection(controlSocket);
controlConnection.authenticate(FileUtilities.read(cookieFile));
// Tell Tor to exit when the control connection is closed
controlConnection.takeOwnership();
controlConnection.resetConf(Collections.singletonList(OWNER));
// Register to receive events from the Tor process
controlConnection.setEventHandler(new OnionProxyManagerEventHandler());
controlConnection.setEvents(Arrays.asList(EVENTS));
// We only set the class property once the connection is in a known good state
this.controlConnection = controlConnection;
return true;
} catch (SecurityException e) {
LOG.warn(e.toString(), e);
return false;
} catch (InterruptedException e) {
LOG.warn("Interrupted while starting Tor", e);
Thread.currentThread().interrupt();
return false;
} finally {
if (controlConnection == null && torProcess != null) {
// It's possible that something 'bad' could happen after we executed exec but before we
// takeOwnership()
// in which case the Tor OP will hang out as a zombie until this process is killed. This is
// problematic
// when we want to do things like
torProcess.destroy();
}
}
}