Beispiel #1
0
  public static void disconnectClient(SocketChannel sc) {
    String clientName = getNickFromSocket(sc);
    if (clientName == null) {
      Utils.printErrorAndExit("Error: it could not happen");
    }

    sendMessage(sc, MessageUtils.bye());
    clients.remove(clientName);
    Utils.tryClose(sc);

    notifyAllClients(clientName + " leave this chatroom");
    System.out.println(clientName + " leave this chatroom");
  }
Beispiel #2
0
  public static void kill(StringTokenizer st) {
    try {
      if (st.hasMoreTokens()) {
        String clientName = st.nextToken();

        if (clients.containsKey(clientName)) {
          SocketChannel clientChannel = clients.get(clientName);
          clients.remove(clientName);
          sendMessage(clientChannel, MessageUtils.bye());
          notifyAllClients(clientName + " leave this chatroom");
          System.out.println(clientName + " leave this chatroom");
          Utils.tryClose(clientChannel);
        } else {
          System.err.println("kill: no such client");
        }
      } else {
        System.err.println("kill: no client name");
      }
    } catch (Exception expt) {
      Utils.printErrorAndExit(expt.getMessage());
    }
  }
Beispiel #3
0
  public static void stop() {
    try {
      if (port[0] != -1) {

        for (Entry<String, SocketChannel> client : clients.entrySet()) {
          if (client.getValue().isConnected()) {
            sendMessage(client.getValue(), MessageUtils.bye());
            Utils.tryClose(client.getValue());
          }
        }

        Utils.tryClose(serverSocket);
        clients.clear();
        port[0] = -1;

      } else {
        System.err.println("stop: already stopped");
      }

    } catch (Exception expt) {
      Utils.printErrorAndExit(expt.getMessage());
    }
  }
Beispiel #4
0
  public static void checkClients(List<SocketChannel> anonymousClients) {
    try {

      if (selector.selectNow() == 0) {
        return;
      }

      Set<SelectionKey> keys = selector.selectedKeys();
      for (SelectionKey key : keys) {

        if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
          SocketChannel clientSocket = serverSocket.accept();
          if (clientSocket == null) {
            System.err.println("Error: can not accept");
            continue;
          }
          anonymousClients.add(clientSocket);
          clientSocket.configureBlocking(false);
          clientSocket.register(selector, SelectionKey.OP_READ);
        } else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
          SocketChannel clientSocket = (SocketChannel) key.channel();
          ByteBuffer bytes = ByteBuffer.allocate(4096);

          if (clientSocket.read(bytes) != -1) {
            byte[] message = bytes.array();
            switch (message[0]) {
              case 1:
                {
                  String nick = MessageUtils.parseMessage(message).first;
                  if (!checkMessage(nick, "", clientSocket)) {
                    continue;
                  }

                  if (clients.containsKey(nick) || nick.length() > 32) {
                    if (nick.length() > 32) {
                      sendMessage(
                          clientSocket, MessageUtils.error("<server>: your nick is too long"));
                    } else {
                      sendMessage(
                          clientSocket,
                          MessageUtils.error("<server>: another user is using this nick"));
                    }
                    sendMessage(clientSocket, MessageUtils.bye());
                    anonymousClients.remove(clientSocket);
                    Utils.tryClose(clientSocket);
                  } else {
                    System.out.println(nick + " enter this chatroom");
                    notifyAllClients(nick + " enter this chatroom");

                    sendMessage(
                        clientSocket,
                        MessageUtils.message("<server>", "Wellcome, your nick is " + nick));
                    anonymousClients.remove(clientSocket);
                    clients.put(nick, clientSocket);
                  }
                  break;
                }

              case 2:
                {
                  String nick = getNickFromSocket(clientSocket);
                  if (nick == null) {
                    Utils.printErrorAndExit("Error: it could not happen");
                  }

                  Utils.Pair<String, String> pair = MessageUtils.parseMessage(message);
                  if (!checkMessage(pair.first, pair.second, clientSocket)) {
                    continue;
                  }

                  if (!pair.first.equals(nick)) {
                    System.out.println("Cheater: " + nick);
                    sendMessage(clientSocket, MessageUtils.message("<server>", "do not cheat"));
                  }

                  for (Entry<String, SocketChannel> client : clients.entrySet()) {
                    if (!clientSocket.equals(client.getValue())) {
                      sendMessage(client.getValue(), MessageUtils.message(nick, pair.second));
                    }
                  }
                  break;
                }

              case 3:
                disconnectClient(clientSocket);
                break;

              case 127:
                {
                  String nick = getNickFromSocket(clientSocket);

                  Utils.Pair<String, String> pair = MessageUtils.parseMessage(message);
                  if (!checkMessage(pair.first, pair.second, clientSocket)) {
                    continue;
                  }

                  if (!pair.first.equals(nick)) {
                    System.out.println("Cheater: " + nick);
                    sendMessage(clientSocket, MessageUtils.message("<server>", "do not cheat"));
                  }
                  System.out.println(nick + ": " + pair.second);
                  break;
                }

              default:
                System.out.println("Bad message from " + getNickFromSocket(clientSocket));
                sendMessage(clientSocket, MessageUtils.message("<server>", "bad message"));
                break;
            }
          } else {
            disconnectClient(clientSocket);
          }
        }
      }
      keys.clear();
    } catch (Exception expt) {
      expt.printStackTrace();
      Utils.printErrorAndExit(expt.getMessage());
    }
  }