public InetSocketAddress getLocalAddress() throws IOException {
if (!nfd.isValid()) return null;
ByteBuffer name = ByteBuffer.allocateDirect(18);
int namelen = getsockname(nfd.getNativeFD(), name);
if (namelen == 0) // not bound
return null; // XXX return some wildcard?
if (namelen == 4) {
byte[] addr = new byte[4];
name.get(addr);
int port = name.getShort() & 0xFFFF;
return new InetSocketAddress(Inet4Address.getByAddress(addr), port);
}
if (namelen == 16) {
byte[] addr = new byte[16];
name.get(addr);
int port = name.getShort() & 0xFFFF;
return new InetSocketAddress(Inet6Address.getByAddress(addr), port);
}
throw new SocketException("invalid address length");
}
/**
* Returns the socket address of the remote peer this channel is connected to, or null if this
* channel is not yet connected.
*
* @return The peer address.
* @throws IOException
*/
public InetSocketAddress getPeerAddress() throws IOException {
if (!nfd.isValid()) return null;
ByteBuffer name = ByteBuffer.allocateDirect(18);
int namelen = getpeername(nfd.getNativeFD(), name);
if (namelen == 0) // not connected yet
return null;
if (namelen == 4) // IPv4
{
byte[] addr = new byte[4];
name.get(addr);
int port = name.getShort() & 0xFFFF;
return new InetSocketAddress(Inet4Address.getByAddress(addr), port);
} else if (namelen == 16) // IPv6
{
byte[] addr = new byte[16];
name.get(addr);
int port = name.getShort() & 0xFFFF;
return new InetSocketAddress(Inet6Address.getByAddress(addr), port);
}
throw new SocketException("invalid address length");
}
/**
* Open a file at PATH, initializing the native state to operate on that open file.
*
* @param path The absolute file path.
* @throws IOException If the file cannot be opened, or if this channel was previously
* initialized.
*/
public void openFile(String path, int mode) throws IOException {
if (nfd.isValid() || nfd.isClosed()) throw new IOException("can't reinitialize this channel");
int fd = open(path, mode);
nfd.setNativeFD(fd);
kind = Kind.FILE;
}
/**
* Create a new socket. This method will initialize the native file descriptor state of this
* instance.
*
* @param stream Whether or not to create a streaming socket, or a datagram socket.
* @throws IOException If creating a new socket fails, or if this channel already has its native
* descriptor initialized.
*/
public void initSocket(boolean stream) throws IOException {
if (nfd.isValid()) throw new IOException("native FD already initialized");
if (stream) kind = Kind.SOCK_STREAM;
else kind = Kind.SOCK_DGRAM;
nfd.setNativeFD(socket(stream));
}
