Initial implementation of unix domain channels. See j.n.c.{Server}SocketChannel apidoc
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package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ProtocolFamily;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.SocketOption;
import java.net.SocketTimeoutException;
import java.net.StandardProtocolFamily;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.channels.AlreadyBoundException;
import java.nio.channels.AlreadyConnectedException;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.ConnectionPendingException;
import java.nio.channels.IllegalBlockingModeException;
import java.nio.channels.NoConnectionPendingException;
import java.nio.channels.NotYetConnectedException;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.SelectorProvider;
import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
import sun.net.ConnectionResetException;
import sun.net.NetHooks;
import sun.net.ext.ExtendedSocketOptions;
import sun.net.util.SocketExceptions;
/**
* An implementation of SocketChannels
*/
class InetSocketChannelImpl extends SocketChannelImpl
{
// set true when exclusive binding is on and SO_REUSEADDR is emulated
private boolean isReuseAddress;
// Constructor for normal connecting sockets
//
InetSocketChannelImpl(SelectorProvider sp) throws IOException {
super(sp);
}
InetSocketChannelImpl(SelectorProvider sp, FileDescriptor fd, boolean bound)
throws IOException
{
super(sp, fd);
if (bound) {
synchronized (stateLock) {
this.localAddress = Net.localAddress(fd);
}
}
}
// Constructor for sockets obtained from server sockets
//
InetSocketChannelImpl(SelectorProvider sp, FileDescriptor fd, InetSocketAddress isa)
throws IOException
{
super(sp, fd);
synchronized (stateLock) {
this.localAddress = Net.localAddress(fd);
this.remoteAddress = isa;
this.state = ST_CONNECTED;
}
}
@Override
public SocketAddress getLocalAddress() throws IOException {
synchronized (stateLock) {
ensureOpen();
return Net.getRevealedLocalAddress((InetSocketAddress)localAddress);
}
}
@Override
public SocketAddress getRemoteAddress() throws IOException {
synchronized (stateLock) {
ensureOpen();
return remoteAddress;
}
}
@Override
public <T> SocketChannel setOption(SocketOption<T> name, T value)
throws IOException
{
Objects.requireNonNull(name);
if (!supportedOptions().contains(name))
throw new UnsupportedOperationException("'" + name + "' not supported");
if (!name.type().isInstance(value))
throw new IllegalArgumentException("Invalid value '" + value + "'");
synchronized (stateLock) {
ensureOpen();
if (name == StandardSocketOptions.IP_TOS) {
ProtocolFamily family = Net.isIPv6Available() ?
StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
Net.setSocketOption(fd, family, name, value);
return this;
}
if (name == StandardSocketOptions.SO_REUSEADDR && Net.useExclusiveBind()) {
// SO_REUSEADDR emulated when using exclusive bind
isReuseAddress = (Boolean)value;
return this;
}
// no options that require special handling
Net.setSocketOption(fd, name, value);
return this;
}
}
@Override
@SuppressWarnings("unchecked")
public <T> T getOption(SocketOption<T> name)
throws IOException
{
Objects.requireNonNull(name);
if (!supportedOptions().contains(name))
throw new UnsupportedOperationException("'" + name + "' not supported");
synchronized (stateLock) {
ensureOpen();
if (name == StandardSocketOptions.SO_REUSEADDR && Net.useExclusiveBind()) {
// SO_REUSEADDR emulated when using exclusive bind
return (T)Boolean.valueOf(isReuseAddress);
}
// special handling for IP_TOS: always return 0 when IPv6
if (name == StandardSocketOptions.IP_TOS) {
ProtocolFamily family = Net.isIPv6Available() ?
StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
return (T) Net.getSocketOption(fd, family, name);
}
// no options that require special handling
return (T) Net.getSocketOption(fd, name);
}
}
private static class DefaultOptionsHolder {
static final Set<SocketOption<?>> defaultOptions = defaultOptions();
private static Set<SocketOption<?>> defaultOptions() {
HashSet<SocketOption<?>> set = new HashSet<>();
set.add(StandardSocketOptions.SO_SNDBUF);
set.add(StandardSocketOptions.SO_RCVBUF);
set.add(StandardSocketOptions.SO_KEEPALIVE);
set.add(StandardSocketOptions.SO_REUSEADDR);
if (Net.isReusePortAvailable()) {
set.add(StandardSocketOptions.SO_REUSEPORT);
}
set.add(StandardSocketOptions.SO_LINGER);
set.add(StandardSocketOptions.TCP_NODELAY);
// additional options required by socket adaptor
set.add(StandardSocketOptions.IP_TOS);
set.add(ExtendedSocketOption.SO_OOBINLINE);
set.addAll(ExtendedSocketOptions.clientSocketOptions());
return Collections.unmodifiableSet(set);
}
}
@Override
public final Set<SocketOption<?>> supportedOptions() {
return DefaultOptionsHolder.defaultOptions;
}
@Override
public Socket socket() {
synchronized (stateLock) {
if (socket == null)
socket = SocketAdaptor.create(this);
return socket;
}
}
/**
* Writes a byte of out of band data.
*/
int sendOutOfBandData(byte b) throws IOException {
writeLock.lock();
try {
boolean blocking = isBlocking();
int n = 0;
try {
beginWrite(blocking);
if (blocking) {
do {
n = Net.sendOOB(fd, b);
} while (n == IOStatus.INTERRUPTED && isOpen());
} else {
n = Net.sendOOB(fd, b);
}
} finally {
endWrite(blocking, n > 0);
if (n <= 0 && isOutputClosed)
throw new AsynchronousCloseException();
}
return IOStatus.normalize(n);
} finally {
writeLock.unlock();
}
}
@Override
public SocketChannel bind(SocketAddress local) throws IOException {
readLock.lock();
try {
writeLock.lock();
try {
synchronized (stateLock) {
ensureOpen();
if (state == ST_CONNECTIONPENDING)
throw new ConnectionPendingException();
if (localAddress != null)
throw new AlreadyBoundException();
InetSocketAddress isa = (local == null) ?
new InetSocketAddress(0) : Net.checkAddress(local);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkListen(isa.getPort());
}
NetHooks.beforeTcpBind(fd, isa.getAddress(), isa.getPort());
Net.bind(fd, isa.getAddress(), isa.getPort());
localAddress = Net.localAddress(fd);
}
} finally {
writeLock.unlock();
}
} finally {
readLock.unlock();
}
return this;
}
/**
* Checks the remote address to which this channel is to be connected.
*/
@Override
protected SocketAddress checkRemote(SocketAddress sa) throws IOException {
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
}
if (isa.getAddress().isAnyLocalAddress()) {
return new InetSocketAddress(InetAddress.getLocalHost(), isa.getPort());
} else {
return isa;
}
}
@Override
protected int connectImpl(FileDescriptor fd, SocketAddress sa) throws IOException {
InetSocketAddress isa = (InetSocketAddress)sa;
return Net.connect(fd, isa.getAddress(), isa.getPort());
}
@Override
protected SocketAddress localAddressImpl(FileDescriptor fd) throws IOException {
return Net.localAddress(fd);
}
@Override
protected String getRevealedLocalAddressAsString(SocketAddress sa) {
InetSocketAddress isa = (InetSocketAddress)sa;
return Net.getRevealedLocalAddressAsString(isa);
}
}