@Override
public DatagramChannel bind(SocketAddress local) throws IOException {
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpen();
if (localAddress != null) throw new AlreadyBoundException();
InetSocketAddress isa;
if (local == null) {
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
isa = new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
} else {
isa = new InetSocketAddress(0);
}
} else {
isa = Net.checkAddress(local);
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
InetAddress addr = isa.getAddress();
if (!(addr instanceof Inet4Address)) throw new UnsupportedAddressTypeException();
}
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkListen(isa.getPort());
}
Net.bind(family, fd, isa.getAddress(), isa.getPort());
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
public DatagramChannel connect(SocketAddress sa) throws IOException {
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
int n = Net.connect(family, fd, isa.getAddress(), isa.getPort());
if (n <= 0) throw new Error(); // Can't happen
// Connection succeeded; disallow further invocation
state = ST_CONNECTED;
remoteAddress = sa;
sender = isa;
cachedSenderInetAddress = isa.getAddress();
cachedSenderPort = isa.getPort();
// set or refresh local address
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
public boolean connect(SocketAddress sa) throws IOException {
int trafficClass = 0; // ## Pick up from options
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
synchronized (blockingLock()) {
int n = 0;
try {
try {
begin();
synchronized (stateLock) {
if (!isOpen()) {
return false;
}
readerThread = NativeThread.current();
}
for (; ; ) {
InetAddress ia = isa.getAddress();
if (ia.isAnyLocalAddress()) ia = InetAddress.getLocalHost();
n = connectImpl(ia, isa.getPort(), trafficClass);
if ((n == IOStatus.INTERRUPTED) && isOpen()) continue;
break;
}
} finally {
readerCleanup();
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
} catch (IOException x) {
// If an exception was thrown, close the channel after
// invoking end() so as to avoid bogus
// AsynchronousCloseExceptions
close();
throw x;
}
synchronized (stateLock) {
remoteAddress = isa;
if (n > 0) {
// Connection succeeded; disallow further
// invocation
state = ST_CONNECTED;
return true;
}
// If nonblocking and no exception then connection
// pending; disallow another invocation
if (!isBlocking()) state = ST_PENDING;
else assert false;
}
}
return false;
}
}
}
public int send(ByteBuffer src, SocketAddress target) throws IOException {
if (src == null) throw new NullPointerException();
synchronized (writeLock) {
ensureOpen();
InetSocketAddress isa = Net.checkAddress(target);
InetAddress ia = isa.getAddress();
if (ia == null) throw new IOException("Target address not resolved");
synchronized (stateLock) {
if (!isConnected()) {
if (target == null) throw new NullPointerException();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (ia.isMulticastAddress()) {
sm.checkMulticast(ia);
} else {
sm.checkConnect(ia.getHostAddress(), isa.getPort());
}
}
} else { // Connected case; Check address then write
if (!target.equals(remoteAddress)) {
throw new IllegalArgumentException("Connected address not equal to target address");
}
return write(src);
}
}
int n = 0;
try {
begin();
if (!isOpen()) return 0;
writerThread = NativeThread.current();
do {
n = send(fd, src, isa);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
synchronized (stateLock) {
if (isOpen() && (localAddress == null)) {
localAddress = Net.localAddress(fd);
}
}
return IOStatus.normalize(n);
} finally {
writerThread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
public SocketAddress receive(ByteBuffer dst) throws IOException {
if (dst.isReadOnly()) throw new IllegalArgumentException("Read-only buffer");
if (dst == null) throw new NullPointerException();
synchronized (readLock) {
ensureOpen();
// Socket was not bound before attempting receive
if (localAddress() == null) bind(null);
int n = 0;
ByteBuffer bb = null;
try {
begin();
if (!isOpen()) return null;
SecurityManager security = System.getSecurityManager();
readerThread = NativeThread.current();
if (isConnected() || (security == null)) {
do {
n = receive(fd, dst);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
if (n == IOStatus.UNAVAILABLE) return null;
} else {
bb = Util.getTemporaryDirectBuffer(dst.remaining());
for (; ; ) {
do {
n = receive(fd, bb);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
if (n == IOStatus.UNAVAILABLE) return null;
InetSocketAddress isa = (InetSocketAddress) sender;
try {
security.checkAccept(isa.getAddress().getHostAddress(), isa.getPort());
} catch (SecurityException se) {
// Ignore packet
bb.clear();
n = 0;
continue;
}
bb.flip();
dst.put(bb);
break;
}
}
return sender;
} finally {
if (bb != null) Util.releaseTemporaryDirectBuffer(bb);
readerThread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
@Override
public DatagramChannel connect(SocketAddress sa) throws IOException {
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
int n = Net.connect(family, fd, isa.getAddress(), isa.getPort());
if (n <= 0) throw new Error(); // Can't happen
// Connection succeeded; disallow further invocation
state = ST_CONNECTED;
remoteAddress = isa;
sender = isa;
cachedSenderInetAddress = isa.getAddress();
cachedSenderPort = isa.getPort();
// set or refresh local address
localAddress = Net.localAddress(fd);
// flush any packets already received.
boolean blocking = false;
synchronized (blockingLock()) {
try {
blocking = isBlocking();
// remainder of each packet thrown away
ByteBuffer tmpBuf = ByteBuffer.allocate(1);
if (blocking) {
configureBlocking(false);
}
do {
tmpBuf.clear();
} while (receive(tmpBuf) != null);
} finally {
if (blocking) {
configureBlocking(true);
}
}
}
}
}
}
return this;
}
public DatagramChannel disconnect() throws IOException {
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
if (!isConnected() || !isOpen()) return this;
InetSocketAddress isa = (InetSocketAddress) remoteAddress;
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
disconnect0(fd);
remoteAddress = null;
state = ST_UNCONNECTED;
// refresh local address
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
/** Joins channel's socket to the given group/interface and optional source address. */
private MembershipKey innerJoin(InetAddress group, NetworkInterface interf, InetAddress source)
throws IOException {
if (!group.isMulticastAddress())
throw new IllegalArgumentException("Group not a multicast address");
// check multicast address is compatible with this socket
if (group instanceof Inet4Address) {
if (family == StandardProtocolFamily.INET6 && !Net.canIPv6SocketJoinIPv4Group())
throw new IllegalArgumentException("IPv6 socket cannot join IPv4 multicast group");
} else if (group instanceof Inet6Address) {
if (family != StandardProtocolFamily.INET6)
throw new IllegalArgumentException("Only IPv6 sockets can join IPv6 multicast group");
} else {
throw new IllegalArgumentException("Address type not supported");
}
// check source address
if (source != null) {
if (source.isAnyLocalAddress())
throw new IllegalArgumentException("Source address is a wildcard address");
if (source.isMulticastAddress())
throw new IllegalArgumentException("Source address is multicast address");
if (source.getClass() != group.getClass())
throw new IllegalArgumentException("Source address is different type to group");
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkMulticast(group);
synchronized (stateLock) {
if (!isOpen()) throw new ClosedChannelException();
// check the registry to see if we are already a member of the group
if (registry == null) {
registry = new MembershipRegistry();
} else {
// return existing membership key
MembershipKey key = registry.checkMembership(group, interf, source);
if (key != null) return key;
}
MembershipKeyImpl key;
if ((family == StandardProtocolFamily.INET6)
&& ((group instanceof Inet6Address) || Net.canJoin6WithIPv4Group())) {
int index = interf.getIndex();
if (index == -1) throw new IOException("Network interface cannot be identified");
// need multicast and source address as byte arrays
byte[] groupAddress = Net.inet6AsByteArray(group);
byte[] sourceAddress = (source == null) ? null : Net.inet6AsByteArray(source);
// join the group
int n = Net.join6(fd, groupAddress, index, sourceAddress);
if (n == IOStatus.UNAVAILABLE) throw new UnsupportedOperationException();
key =
new MembershipKeyImpl.Type6(
this, group, interf, source, groupAddress, index, sourceAddress);
} else {
// need IPv4 address to identify interface
Inet4Address target = Net.anyInet4Address(interf);
if (target == null) throw new IOException("Network interface not configured for IPv4");
int groupAddress = Net.inet4AsInt(group);
int targetAddress = Net.inet4AsInt(target);
int sourceAddress = (source == null) ? 0 : Net.inet4AsInt(source);
// join the group
int n = Net.join4(fd, groupAddress, targetAddress, sourceAddress);
if (n == IOStatus.UNAVAILABLE) throw new UnsupportedOperationException();
key =
new MembershipKeyImpl.Type4(
this, group, interf, source, groupAddress, targetAddress, sourceAddress);
}
registry.add(key);
return key;
}
}