/**
* 'handler' can be of any type that implements 'exportedInterface', but only methods declared by
* the interface (and its superinterfaces) will be invocable.
*/
public <T> InAppServer(
String name,
String portFilename,
InetAddress inetAddress,
Class<T> exportedInterface,
T handler) {
this.fullName = name + "Server";
this.exportedInterface = exportedInterface;
this.handler = handler;
// In the absence of authentication, we shouldn't risk starting a server as root.
if (System.getProperty("user.name").equals("root")) {
Log.warn(
"InAppServer: refusing to start unauthenticated server \"" + fullName + "\" as root!");
return;
}
try {
File portFile = FileUtilities.fileFromString(portFilename);
secretFile = new File(portFile.getPath() + ".secret");
Thread serverThread = new Thread(new ConnectionAccepter(portFile, inetAddress), fullName);
// If there are no other threads left, the InApp server shouldn't keep us alive.
serverThread.setDaemon(true);
serverThread.start();
} catch (Throwable th) {
Log.warn("InAppServer: couldn't start \"" + fullName + "\".", th);
}
writeNewSecret();
}
private void closeClientSocket() {
try {
client.close();
} catch (IOException ex) {
Log.warn(Thread.currentThread().getName() + ": failed to close client socket.", ex);
}
}
private void writeHostAndPortToFile(File portFile) {
String host = socket.getInetAddress().getHostName();
int port = socket.getLocalPort();
// The motivation for the Log.warn would be better satisfied by Bug 38.
Log.warn("echo " + host + ":" + port + " > " + portFile);
StringUtilities.writeFile(portFile, host + ":" + port + "\n");
}
private void acceptConnections() {
for (; ; ) {
try {
String handlerName = fullName + "-Handler-" + Thread.activeCount();
new Thread(new ClientHandler(socket.accept()), handlerName).start();
} catch (Exception ex) {
Log.warn(fullName + ": exception accepting connection.", ex);
}
}
}
private void handleRequest() throws IOException {
String line = in.readLine();
if (line == null || line.length() == 0) {
Log.warn(Thread.currentThread().getName() + ": ignoring empty request.");
return;
}
if (handleCommand(line, out) == false) {
out.println(
Thread.currentThread().getName() + ": didn't understand request \"" + line + "\".");
}
}
private boolean authenticateClient() throws IOException {
String line = in.readLine();
if (line == null || line.equals(secret) == false) {
Log.warn(
Thread.currentThread().getName()
+ ": failed authentication attempt with \""
+ line
+ "\".");
out.println("Authentication failed");
return false;
}
writeNewSecret();
out.println("Authentication OK");
return true;
}
private void handleClient() {
try {
this.in = new BufferedReader(new InputStreamReader(client.getInputStream()));
this.out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if (authenticateClient()) {
handleRequest();
}
out.flush();
out.close();
in.close();
} catch (Exception ex) {
Log.warn(Thread.currentThread().getName() + ": failure handling client request.", ex);
} finally {
closeClientSocket();
}
}
public boolean handleCommand(String line, PrintWriter out) {
String[] split = line.split("[\t ]");
String commandName = split[0];
try {
Method[] methods = exportedInterface.getMethods();
for (Method method : methods) {
if (method.getName().equals(commandName) && method.getReturnType() == void.class) {
return invokeMethod(line, out, method, split);
}
}
throw new NoSuchMethodException();
} catch (NoSuchMethodException nsmex) {
out.println(fullName + ": didn't understand request \"" + line + "\".");
} catch (Exception ex) {
Log.warn(fullName + ": exception thrown while handling command \"" + line + "\".", ex);
out.println(fullName + ": request denied \"" + line + "\" (" + ex.toString() + ").");
} finally {
out.flush();
out.close();
}
return false;
}
