JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.*;
import java.net.*;
import jdk.net.*;
import java.nio.channels.*;
import java.util.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import sun.net.ExtendedOptionsImpl;
public class Net {
private Net() { }
// unspecified protocol family
static final ProtocolFamily UNSPEC = new ProtocolFamily() {
public String name() {
return "UNSPEC";
}
};
// set to true if exclusive binding is on for Windows
private static final boolean exclusiveBind;
static {
int availLevel = isExclusiveBindAvailable();
if (availLevel >= 0) {
String exclBindProp =
java.security.AccessController.doPrivileged(
new PrivilegedAction<String>() {
@Override
public String run() {
return System.getProperty(
"sun.net.useExclusiveBind");
}
});
if (exclBindProp != null) {
exclusiveBind = exclBindProp.length() == 0 ?
true : Boolean.parseBoolean(exclBindProp);
} else if (availLevel == 1) {
exclusiveBind = true;
} else {
exclusiveBind = false;
}
} else {
exclusiveBind = false;
}
}
// -- Miscellaneous utilities --
private static volatile boolean checkedIPv6 = false;
private static volatile boolean isIPv6Available;
/**
* Tells whether dual-IPv4/IPv6 sockets should be used.
*/
static boolean isIPv6Available() {
if (!checkedIPv6) {
isIPv6Available = isIPv6Available0();
checkedIPv6 = true;
}
return isIPv6Available;
}
/**
* Returns true if exclusive binding is on
*/
static boolean useExclusiveBind() {
return exclusiveBind;
}
/**
* Tells whether IPv6 sockets can join IPv4 multicast groups
*/
static boolean canIPv6SocketJoinIPv4Group() {
return canIPv6SocketJoinIPv4Group0();
}
/**
* Tells whether {@link #join6} can be used to join an IPv4
* multicast group (IPv4 group as IPv4-mapped IPv6 address)
*/
static boolean canJoin6WithIPv4Group() {
return canJoin6WithIPv4Group0();
}
public static InetSocketAddress checkAddress(SocketAddress sa) {
if (sa == null)
throw new NullPointerException();
if (!(sa instanceof InetSocketAddress))
throw new UnsupportedAddressTypeException(); // ## needs arg
InetSocketAddress isa = (InetSocketAddress)sa;
if (isa.isUnresolved())
throw new UnresolvedAddressException(); // ## needs arg
InetAddress addr = isa.getAddress();
if (!(addr instanceof Inet4Address || addr instanceof Inet6Address))
throw new IllegalArgumentException("Invalid address type");
return isa;
}
static InetSocketAddress asInetSocketAddress(SocketAddress sa) {
if (!(sa instanceof InetSocketAddress))
throw new UnsupportedAddressTypeException();
return (InetSocketAddress)sa;
}
static void translateToSocketException(Exception x)
throws SocketException
{
if (x instanceof SocketException)
throw (SocketException)x;
Exception nx = x;
if (x instanceof ClosedChannelException)
nx = new SocketException("Socket is closed");
else if (x instanceof NotYetConnectedException)
nx = new SocketException("Socket is not connected");
else if (x instanceof AlreadyBoundException)
nx = new SocketException("Already bound");
else if (x instanceof NotYetBoundException)
nx = new SocketException("Socket is not bound yet");
else if (x instanceof UnsupportedAddressTypeException)
nx = new SocketException("Unsupported address type");
else if (x instanceof UnresolvedAddressException) {
nx = new SocketException("Unresolved address");
}
if (nx != x)
nx.initCause(x);
if (nx instanceof SocketException)
throw (SocketException)nx;
else if (nx instanceof RuntimeException)
throw (RuntimeException)nx;
else
throw new Error("Untranslated exception", nx);
}
static void translateException(Exception x,
boolean unknownHostForUnresolved)
throws IOException
{
if (x instanceof IOException)
throw (IOException)x;
// Throw UnknownHostException from here since it cannot
// be thrown as a SocketException
if (unknownHostForUnresolved &&
(x instanceof UnresolvedAddressException))
{
throw new UnknownHostException();
}
translateToSocketException(x);
}
static void translateException(Exception x)
throws IOException
{
translateException(x, false);
}
/**
* Returns the local address after performing a SecurityManager#checkConnect.
*/
static InetSocketAddress getRevealedLocalAddress(InetSocketAddress addr) {
SecurityManager sm = System.getSecurityManager();
if (addr == null || sm == null)
return addr;
try{
sm.checkConnect(addr.getAddress().getHostAddress(), -1);
// Security check passed
} catch (SecurityException e) {
// Return loopback address only if security check fails
addr = getLoopbackAddress(addr.getPort());
}
return addr;
}
static String getRevealedLocalAddressAsString(InetSocketAddress addr) {
return System.getSecurityManager() == null ? addr.toString() :
getLoopbackAddress(addr.getPort()).toString();
}
private static InetSocketAddress getLoopbackAddress(int port) {
return new InetSocketAddress(InetAddress.getLoopbackAddress(),
port);
}
/**
* Returns any IPv4 address of the given network interface, or
* null if the interface does not have any IPv4 addresses.
*/
static Inet4Address anyInet4Address(final NetworkInterface interf) {
return AccessController.doPrivileged(new PrivilegedAction<Inet4Address>() {
public Inet4Address run() {
Enumeration<InetAddress> addrs = interf.getInetAddresses();
while (addrs.hasMoreElements()) {
InetAddress addr = addrs.nextElement();
if (addr instanceof Inet4Address) {
return (Inet4Address)addr;
}
}
return null;
}
});
}
/**
* Returns an IPv4 address as an int.
*/
static int inet4AsInt(InetAddress ia) {
if (ia instanceof Inet4Address) {
byte[] addr = ia.getAddress();
int address = addr[3] & 0xFF;
address |= ((addr[2] << 8) & 0xFF00);
address |= ((addr[1] << 16) & 0xFF0000);
address |= ((addr[0] << 24) & 0xFF000000);
return address;
}
throw new AssertionError("Should not reach here");
}
/**
* Returns an InetAddress from the given IPv4 address
* represented as an int.
*/
static InetAddress inet4FromInt(int address) {
byte[] addr = new byte[4];
addr[0] = (byte) ((address >>> 24) & 0xFF);
addr[1] = (byte) ((address >>> 16) & 0xFF);
addr[2] = (byte) ((address >>> 8) & 0xFF);
addr[3] = (byte) (address & 0xFF);
try {
return InetAddress.getByAddress(addr);
} catch (UnknownHostException uhe) {
throw new AssertionError("Should not reach here");
}
}
/**
* Returns an IPv6 address as a byte array
*/
static byte[] inet6AsByteArray(InetAddress ia) {
if (ia instanceof Inet6Address) {
return ia.getAddress();
}
// need to construct IPv4-mapped address
if (ia instanceof Inet4Address) {
byte[] ip4address = ia.getAddress();
byte[] address = new byte[16];
address[10] = (byte)0xff;
address[11] = (byte)0xff;
address[12] = ip4address[0];
address[13] = ip4address[1];
address[14] = ip4address[2];
address[15] = ip4address[3];
return address;
}
throw new AssertionError("Should not reach here");
}
// -- Socket options
static void setSocketOption(FileDescriptor fd, ProtocolFamily family,
SocketOption<?> name, Object value)
throws IOException
{
if (value == null)
throw new IllegalArgumentException("Invalid option value");
// only simple values supported by this method
Class<?> type = name.type();
if (type == SocketFlow.class) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new NetworkPermission("setOption.SO_FLOW_SLA"));
}
ExtendedOptionsImpl.setFlowOption(fd, (SocketFlow)value);
return;
}
if (type != Integer.class && type != Boolean.class)
throw new AssertionError("Should not reach here");
// special handling
if (name == StandardSocketOptions.SO_RCVBUF ||
name == StandardSocketOptions.SO_SNDBUF)
{
int i = ((Integer)value).intValue();
if (i < 0)
throw new IllegalArgumentException("Invalid send/receive buffer size");
}
if (name == StandardSocketOptions.SO_LINGER) {
int i = ((Integer)value).intValue();
if (i < 0)
value = Integer.valueOf(-1);
if (i > 65535)
value = Integer.valueOf(65535);
}
if (name == StandardSocketOptions.IP_TOS) {
int i = ((Integer)value).intValue();
if (i < 0 || i > 255)
throw new IllegalArgumentException("Invalid IP_TOS value");
}
if (name == StandardSocketOptions.IP_MULTICAST_TTL) {
int i = ((Integer)value).intValue();
if (i < 0 || i > 255)
throw new IllegalArgumentException("Invalid TTL/hop value");
}
// map option name to platform level/name
OptionKey key = SocketOptionRegistry.findOption(name, family);
if (key == null)
throw new AssertionError("Option not found");
int arg;
if (type == Integer.class) {
arg = ((Integer)value).intValue();
} else {
boolean b = ((Boolean)value).booleanValue();
arg = (b) ? 1 : 0;
}
boolean mayNeedConversion = (family == UNSPEC);
boolean isIPv6 = (family == StandardProtocolFamily.INET6);
setIntOption0(fd, mayNeedConversion, key.level(), key.name(), arg, isIPv6);
}
static Object getSocketOption(FileDescriptor fd, ProtocolFamily family,
SocketOption<?> name)
throws IOException
{
Class<?> type = name.type();
if (type == SocketFlow.class) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new NetworkPermission("getOption.SO_FLOW_SLA"));
}
SocketFlow flow = SocketFlow.create();
ExtendedOptionsImpl.getFlowOption(fd, flow);
return flow;
}
// only simple values supported by this method
if (type != Integer.class && type != Boolean.class)
throw new AssertionError("Should not reach here");
// map option name to platform level/name
OptionKey key = SocketOptionRegistry.findOption(name, family);
if (key == null)
throw new AssertionError("Option not found");
boolean mayNeedConversion = (family == UNSPEC);
int value = getIntOption0(fd, mayNeedConversion, key.level(), key.name());
if (type == Integer.class) {
return Integer.valueOf(value);
} else {
return (value == 0) ? Boolean.FALSE : Boolean.TRUE;
}
}
// -- Socket operations --
private static native boolean isIPv6Available0();
/*
* Returns 1 for Windows versions that support exclusive binding by default, 0
* for those that do not, and -1 for Solaris/Linux/Mac OS
*/
private static native int isExclusiveBindAvailable();
private static native boolean canIPv6SocketJoinIPv4Group0();
private static native boolean canJoin6WithIPv4Group0();
static FileDescriptor socket(boolean stream) throws IOException {
return socket(UNSPEC, stream);
}
static FileDescriptor socket(ProtocolFamily family, boolean stream)
throws IOException {
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
return IOUtil.newFD(socket0(preferIPv6, stream, false));
}
static FileDescriptor serverSocket(boolean stream) {
return IOUtil.newFD(socket0(isIPv6Available(), stream, true));
}
// Due to oddities SO_REUSEADDR on windows reuse is ignored
private static native int socket0(boolean preferIPv6, boolean stream, boolean reuse);
public static void bind(FileDescriptor fd, InetAddress addr, int port)
throws IOException
{
bind(UNSPEC, fd, addr, port);
}
static void bind(ProtocolFamily family, FileDescriptor fd,
InetAddress addr, int port) throws IOException
{
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
bind0(fd, preferIPv6, exclusiveBind, addr, port);
}
private static native void bind0(FileDescriptor fd, boolean preferIPv6,
boolean useExclBind, InetAddress addr,
int port)
throws IOException;
static native void listen(FileDescriptor fd, int backlog) throws IOException;
static int connect(FileDescriptor fd, InetAddress remote, int remotePort)
throws IOException
{
return connect(UNSPEC, fd, remote, remotePort);
}
static int connect(ProtocolFamily family, FileDescriptor fd, InetAddress remote, int remotePort)
throws IOException
{
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
return connect0(preferIPv6, fd, remote, remotePort);
}
private static native int connect0(boolean preferIPv6,
FileDescriptor fd,
InetAddress remote,
int remotePort)
throws IOException;
public final static int SHUT_RD = 0;
public final static int SHUT_WR = 1;
public final static int SHUT_RDWR = 2;
static native void shutdown(FileDescriptor fd, int how) throws IOException;
private static native int localPort(FileDescriptor fd)
throws IOException;
private static native InetAddress localInetAddress(FileDescriptor fd)
throws IOException;
public static InetSocketAddress localAddress(FileDescriptor fd)
throws IOException
{
return new InetSocketAddress(localInetAddress(fd), localPort(fd));
}
private static native int remotePort(FileDescriptor fd)
throws IOException;
private static native InetAddress remoteInetAddress(FileDescriptor fd)
throws IOException;
static InetSocketAddress remoteAddress(FileDescriptor fd)
throws IOException
{
return new InetSocketAddress(remoteInetAddress(fd), remotePort(fd));
}
private static native int getIntOption0(FileDescriptor fd, boolean mayNeedConversion,
int level, int opt)
throws IOException;
private static native void setIntOption0(FileDescriptor fd, boolean mayNeedConversion,
int level, int opt, int arg, boolean isIPv6)
throws IOException;
static native int poll(FileDescriptor fd, int events, long timeout)
throws IOException;
// -- Multicast support --
/**
* Join IPv4 multicast group
*/
static int join4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
return joinOrDrop4(true, fd, group, interf, source);
}
/**
* Drop membership of IPv4 multicast group
*/
static void drop4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
joinOrDrop4(false, fd, group, interf, source);
}
private static native int joinOrDrop4(boolean join, FileDescriptor fd, int group, int interf, int source)
throws IOException;
/**
* Block IPv4 source
*/
static int block4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
return blockOrUnblock4(true, fd, group, interf, source);
}
/**
* Unblock IPv6 source
*/
static void unblock4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
blockOrUnblock4(false, fd, group, interf, source);
}
private static native int blockOrUnblock4(boolean block, FileDescriptor fd, int group,
int interf, int source)
throws IOException;
/**
* Join IPv6 multicast group
*/
static int join6(FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException
{
return joinOrDrop6(true, fd, group, index, source);
}
/**
* Drop membership of IPv6 multicast group
*/
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java