Ejemplo n.º 1
0
  /**
   * Opens a server TCP connection to clients. Creates, binds, and listens
   *
   * @param port local TCP port to listen on
   * @param backlog listen backlog.
   * @return a native handle to the network connection.
   * @throws IOException
   */
  public int openServer(int port, int backlog) throws IOException {
    int fd = -1;

    fd = sockets.socket(Socket.AF_INET, Socket.SOCK_STREAM, 0);
    if (DEBUG) {
      System.err.println("Socket.socket() = " + fd);
    }
    if (fd < 0) {
      throw newError(fd, "socket create");
    }

    set_blocking_flags(fd, /*is_blocking*/ false);

    setSockOpt(fd, Socket.SO_REUSEADDR, 1);

    setSockOpt(fd, Socket.IPPROTO_TCP, Socket.TCP_NODELAY, 1);

    Socket.sockaddr_in local_sin = new Socket.sockaddr_in();
    local_sin.sin_family = Socket.AF_INET;
    local_sin.sin_port = Inet.htons((short) port);
    local_sin.sin_addr = Socket.INADDR_ANY;
    if (DEBUG) {
      System.err.println("Socket.bind(" + fd + ", " + local_sin + ")");
    }

    if (sockets.bind(fd, local_sin, local_sin.size()) < 0) {
      throw newError(fd, "bind");
    }

    if (sockets.listen(fd, backlog) < 0) {
      throw newError(fd, "listen");
    }

    return fd;
  }
Ejemplo n.º 2
0
  /**
   * set a socket option
   *
   * @param socket socket descriptor
   * @param level Socket.SOL_SOCKET, etc.
   * @param option_name
   * @param option_value new value
   * @throws IOException on error
   */
  public void setSockOpt(int socket, int level, int option_name, int option_value)
      throws IOException {
    IntByReference value = new IntByReference(option_value);
    if (false) Assert.that(option_value == value.getValue());
    if (DEBUG) {
      System.out.println(
          "setSockOpt(" + socket + ", " + level + ", " + option_name + ", " + option_value + ")");
    }
    int err = sockets.setsockopt(socket, level, option_name, value, 4);

    if (false) Assert.that(option_value == value.getValue());
    value.free();
    LibCUtil.errCheckNeg(err);

    if (DEBUG) {
      int newValue = getSockOpt(socket, level, option_name);
      if (option_value != newValue) {
        System.out.println(
            "FAILED: setSockOpt("
                + socket
                + ", "
                + level
                + ", "
                + option_name
                + ", "
                + option_value
                + ")");
        System.err.println("   Ended with: " + newValue);
      }
    }
  }
Ejemplo n.º 3
0
 /**
  * Takes an IPv4 Internet address and returns string representing the address in `.' notation
  *
  * @param in the opaque bytes of an IPv4 "struct in_addr"
  * @return String
  */
 public String inet_ntop(int in) {
   Pointer charBuf = new Pointer(Socket.INET_ADDRSTRLEN);
   IntByReference addrBuf = new IntByReference(in); // the addr is passed by value (to handle IPv6)
   String result = sockets.inet_ntop(Socket.AF_INET, addrBuf, charBuf, Socket.INET_ADDRSTRLEN);
   addrBuf.free();
   charBuf.free();
   return result;
 }
Ejemplo n.º 4
0
 /** @inheritDoc */
 public void close(int fd) throws IOException {
   // NOTE: this would block the VM. A real implementation should
   // make this a async native method.
   sockets.shutdown(fd, 2);
   libc.close(fd);
   if (DEBUG) {
     System.out.println("close(" + fd + ")");
   }
 }
Ejemplo n.º 5
0
  /**
   * Accept client connections on server socket fd. Blocks until a client connects.
   *
   * @param fd open server socket. See {@link #openServer}.
   * @return a native handle to the network connection.
   * @throws IOException
   */
  public int accept(int fd) throws IOException {
    Socket.sockaddr_in remote_sin = new Socket.sockaddr_in();
    IntByReference address_len = new IntByReference(4);
    int newSocket;

    try {
      if (DEBUG) {
        System.err.println("Socket.accept(" + fd + ", " + remote_sin + ")...");
      }

      newSocket = sockets.accept(fd, remote_sin, address_len);

      if (newSocket < 0) {
        if (DEBUG) {
          System.err.println("Need to block for accept...");
        }

        int err_code = LibCUtil.errno();
        if (err_code == LibC.EAGAIN || err_code == LibC.EWOULDBLOCK) {
          VMThread.getSystemEvents().waitForReadEvent(fd);
          newSocket = sockets.accept(fd, remote_sin, address_len);
          if (newSocket < 0) {
            throw newError(fd, "accept");
          }
        } else {
          // BUG!
          throw newError(fd, "accept");
        }
      }
    } finally {
      address_len.free();
    }

    set_blocking_flags(newSocket, /*is_blocking*/ false);
    // we could read info about client from remote_sin, but don't need to.

    if (DEBUG) {
      System.err.println("    Socket.accept(...) = " + newSocket);
    }
    return newSocket;
  }
Ejemplo n.º 6
0
 /** Read errno, try to clean up fd, and create exception. */
 private IOException newError(int fd, String msg) {
   if (DEBUG) {
     VM.print(msg);
     VM.print(": errno: ");
   }
   int err_code = LibCUtil.errno();
   if (DEBUG) {
     VM.print(err_code);
     VM.println();
   }
   sockets.shutdown(fd, 2);
   libc.close(fd);
   return new IOException(" errno: " + err_code + " on fd: " + fd + " during " + msg);
 }
Ejemplo n.º 7
0
  /**
   * get a socket option
   *
   * @param socket socket descriptor
   * @param level Socket.SOL_SOCKET, etc.
   * @param option_name
   * @return socket option value
   * @throws IOException on error
   */
  public int getSockOpt(int socket, int level, int option_name) throws IOException {
    IntByReference value = new IntByReference(0);
    IntByReference opt_len = new IntByReference(4);
    if (DEBUG) {
      System.out.println("getsockopt(" + socket + ", " + level + ", " + option_name + ")");
    }

    int err = sockets.getsockopt(socket, level, option_name, value, opt_len);
    if (DEBUG) {
      System.out.println(
          "    returned value: " + value.getValue() + ", size: " + opt_len.getValue());
    }

    int result = value.getValue();
    value.free();
    if (false) Assert.that(opt_len.getValue() == 4);
    opt_len.free();
    LibCUtil.errCheckNeg(err);
    return result;
  }
Ejemplo n.º 8
0
  /** @inheritDoc */
  public int open(String hostname, int port, int mode) throws IOException {
    // init_sockets(); win32 only
    int fd = -1;

    fd = sockets.socket(Socket.AF_INET, Socket.SOCK_STREAM, 0);
    if (DEBUG) {
      System.err.println("Socket.socket() = " + fd);
    }
    if (fd < 0) {
      throw newError(fd, "socket create");
    }

    set_blocking_flags(fd, /*is_blocking*/ false);

    NetDB.hostent phostent;
    // hostname is always NUL terminated. See socket/Protocol.java for detail.
    phostent = NetDB.INSTANCE.gethostbyname(hostname);
    if (phostent == null) {
      throw newError(fd, "gethostbyname (herrono = " + NetDB.INSTANCE.h_errno() + ")");
    }

    Socket.sockaddr_in destination_sin = new Socket.sockaddr_in();
    destination_sin.sin_family = Socket.AF_INET;
    destination_sin.sin_port = Inet.htons((short) port);
    destination_sin.sin_addr = phostent.h_addr_list[0];

    if (DEBUG) {
      System.err.println("Socket.sockaddr_in: " + destination_sin);
      System.err.println("connect: hostname: " + hostname + " port: " + port + " mode: " + mode);
    }
    if (sockets.connect(fd, destination_sin, destination_sin.size()) < 0) {
      int err_code = LibCUtil.errno();
      if (err_code == LibC.EINPROGRESS || err_code == LibC.EWOULDBLOCK) {
        // When the socket is ready for connect, it becomes *writable*
        // (according to BSD socket spec of select())
        VMThread.getSystemEvents().waitForWriteEvent(fd);

        int errno = getSockOpt(fd, Socket.SO_ERROR);
        if (errno != 0) {
          String msg;
          if (errno == LibC.ECONNREFUSED) {
            msg = "connect refused";
          } else {
            msg = String.valueOf(errno);
          }
          throw new IOException("ConnectException: " + msg);
        }

        if (DEBUG) {
          System.err.println("connect back fd = " + fd);
        }
      } else {
        throw newError(fd, "connect");
      }
    }

    try {
      setSockOpt(fd, Socket.IPPROTO_TCP, Socket.TCP_NODELAY, 1);
    } catch (IOException ex) {
    }

    return fd;
  }