/*
 * Copyright (c) 2009, 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.sctp;

import java.io.FileDescriptor;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.channels.AlreadyBoundException;
import java.util.Set;
import java.util.HashSet;
import java.security.AccessController;
import java.security.PrivilegedAction;
import sun.nio.ch.IOUtil;
import sun.nio.ch.Net;
import com.sun.nio.sctp.SctpSocketOption;
import static com.sun.nio.sctp.SctpStandardSocketOptions.*;

public class SctpNet {
    private static final String osName = AccessController.doPrivileged(
        (PrivilegedAction<String>) () -> System.getProperty("os.name"));

    /* -- Miscellaneous SCTP utilities -- */

    private static boolean IPv4MappedAddresses() {
        if ("SunOS".equals(osName)) {
            /* Solaris supports IPv4Mapped Addresses with bindx */
            return true;
        } /* else {  //other OS/implementations  */

        /* lksctp/linux requires Ipv4 addresses */
        return false;
    }

    static boolean throwAlreadyBoundException() throws IOException {
        throw new AlreadyBoundException();
    }

    static void listen(int fd, int backlog) throws IOException {
        listen0(fd, backlog);
    }

    static int connect(int fd, InetAddress remote, int remotePort)
            throws IOException {
        return connect0(fd, remote, remotePort);
    }

    static void close(int fd) throws IOException {
        close0(fd);
    }

    static void preClose(int fd) throws IOException {
        preClose0(fd);
    }

    
Params:
  • oneToOne – if true returns a one-to-one sctp socket, otherwise returns a one-to-many sctp socket
/** * @param oneToOne * if {@code true} returns a one-to-one sctp socket, otherwise * returns a one-to-many sctp socket */
static FileDescriptor socket(boolean oneToOne) throws IOException { int nativefd = socket0(oneToOne); return IOUtil.newFD(nativefd); } static void bindx(int fd, InetAddress[] addrs, int port, boolean add) throws IOException { bindx(fd, addrs, port, addrs.length, add, IPv4MappedAddresses()); } static Set<SocketAddress> getLocalAddresses(int fd) throws IOException { Set<SocketAddress> set = null; SocketAddress[] saa = getLocalAddresses0(fd); if (saa != null) { set = getRevealedLocalAddressSet(saa); } return set; } private static Set<SocketAddress> getRevealedLocalAddressSet( SocketAddress[] saa) { SecurityManager sm = System.getSecurityManager(); Set<SocketAddress> set = new HashSet<>(saa.length); for (SocketAddress sa : saa) { set.add(getRevealedLocalAddress(sa, sm)); } return set; } private static SocketAddress getRevealedLocalAddress(SocketAddress sa, SecurityManager sm) { if (sm == null || sa == null) return sa; InetSocketAddress ia = (InetSocketAddress)sa; try{ sm.checkConnect(ia.getAddress().getHostAddress(), -1); // Security check passed } catch (SecurityException e) { // Return loopback address return new InetSocketAddress(InetAddress.getLoopbackAddress(), ia.getPort()); } return sa; } static Set<SocketAddress> getRemoteAddresses(int fd, int assocId) throws IOException { HashSet<SocketAddress> set = null; SocketAddress[] saa = getRemoteAddresses0(fd, assocId); if (saa != null) { set = new HashSet<SocketAddress>(saa.length); for (SocketAddress sa : saa) set.add(sa); } return set; } static <T> void setSocketOption(int fd, SctpSocketOption<T> name, T value, int assocId) throws IOException { if (value == null) throw new IllegalArgumentException("Invalid option value"); if (name.equals(SCTP_INIT_MAXSTREAMS)) { InitMaxStreams maxStreamValue = (InitMaxStreams)value; SctpNet.setInitMsgOption0(fd, maxStreamValue.maxInStreams(), maxStreamValue.maxOutStreams()); } else if (name.equals(SCTP_PRIMARY_ADDR) || name.equals(SCTP_SET_PEER_PRIMARY_ADDR)) { SocketAddress addr = (SocketAddress) value; if (addr == null) throw new IllegalArgumentException("Invalid option value"); Net.checkAddress(addr); InetSocketAddress netAddr = (InetSocketAddress)addr; if (name.equals(SCTP_PRIMARY_ADDR)) { setPrimAddrOption0(fd, assocId, netAddr.getAddress(), netAddr.getPort()); } else { setPeerPrimAddrOption0(fd, assocId, netAddr.getAddress(), netAddr.getPort(), IPv4MappedAddresses()); } } else if (name.equals(SCTP_DISABLE_FRAGMENTS) || name.equals(SCTP_EXPLICIT_COMPLETE) || name.equals(SCTP_FRAGMENT_INTERLEAVE) || name.equals(SCTP_NODELAY) || name.equals(SO_SNDBUF) || name.equals(SO_RCVBUF) || name.equals(SO_LINGER)) { setIntOption(fd, name, value); } else { throw new AssertionError("Unknown socket option"); } } static Object getSocketOption(int fd, SctpSocketOption<?> name, int assocId) throws IOException { if (name.equals(SCTP_SET_PEER_PRIMARY_ADDR)) { throw new IllegalArgumentException( "SCTP_SET_PEER_PRIMARY_ADDR cannot be retrieved"); } else if (name.equals(SCTP_INIT_MAXSTREAMS)) { /* container for holding maxIn/Out streams */ int[] values = new int[2]; SctpNet.getInitMsgOption0(fd, values); return InitMaxStreams.create(values[0], values[1]); } else if (name.equals(SCTP_PRIMARY_ADDR)) { return getPrimAddrOption0(fd, assocId); } else if (name.equals(SCTP_DISABLE_FRAGMENTS) || name.equals(SCTP_EXPLICIT_COMPLETE) || name.equals(SCTP_FRAGMENT_INTERLEAVE) || name.equals(SCTP_NODELAY) || name.equals(SO_SNDBUF) || name.equals(SO_RCVBUF) || name.equals(SO_LINGER)) { return getIntOption(fd, name); } else { throw new AssertionError("Unknown socket option"); } } static void setIntOption(int fd, SctpSocketOption<?> name, Object value) throws IOException { if (value == null) throw new IllegalArgumentException("Invalid option value"); Class<?> type = name.type(); if (type != Integer.class && type != Boolean.class) throw new AssertionError("Should not reach here"); if (name == SO_RCVBUF || name == SO_SNDBUF) { int i = ((Integer)value).intValue(); if (i < 0) throw new IllegalArgumentException( "Invalid send/receive buffer size"); } else if (name == SO_LINGER) { int i = ((Integer)value).intValue(); if (i < 0) value = Integer.valueOf(-1); if (i > 65535) value = Integer.valueOf(65535); } else if (name.equals(SCTP_FRAGMENT_INTERLEAVE)) { int i = ((Integer)value).intValue(); if (i < 0 || i > 2) throw new IllegalArgumentException( "Invalid value for SCTP_FRAGMENT_INTERLEAVE"); } int arg; if (type == Integer.class) { arg = ((Integer)value).intValue(); } else { boolean b = ((Boolean)value).booleanValue(); arg = (b) ? 1 : 0; } setIntOption0(fd, ((SctpStdSocketOption)name).constValue(), arg); } static Object getIntOption(int fd, SctpSocketOption<?> name) throws IOException { Class<?> type = name.type(); if (type != Integer.class && type != Boolean.class) throw new AssertionError("Should not reach here"); if (!(name instanceof SctpStdSocketOption)) throw new AssertionError("Should not reach here"); int value = getIntOption0(fd, ((SctpStdSocketOption)name).constValue()); if (type == Integer.class) { return Integer.valueOf(value); } else { return (value == 0) ? Boolean.FALSE : Boolean.TRUE; } } static void shutdown(int fd, int assocId) throws IOException { shutdown0(fd, assocId); } static FileDescriptor branch(int fd, int assocId) throws IOException { int nativefd = branch0(fd, assocId); return IOUtil.newFD(nativefd); } /* Native Methods */ static native int socket0(boolean oneToOne) throws IOException; static native void listen0(int fd, int backlog) throws IOException; static native int connect0(int fd, InetAddress remote, int remotePort) throws IOException; static native void close0(int fd) throws IOException; static native void preClose0(int fd) throws IOException; static native void bindx(int fd, InetAddress[] addrs, int port, int length, boolean add, boolean preferIPv6) throws IOException; static native int getIntOption0(int fd, int opt) throws IOException; static native void setIntOption0(int fd, int opt, int arg) throws IOException; static native SocketAddress[] getLocalAddresses0(int fd) throws IOException; static native SocketAddress[] getRemoteAddresses0(int fd, int assocId) throws IOException; static native int branch0(int fd, int assocId) throws IOException; static native void setPrimAddrOption0(int fd, int assocId, InetAddress ia, int port) throws IOException; static native void setPeerPrimAddrOption0(int fd, int assocId, InetAddress ia, int port, boolean preferIPv6) throws IOException; static native SocketAddress getPrimAddrOption0(int fd, int assocId) throws IOException; /* retVals [0] maxInStreams, [1] maxOutStreams */ static native void getInitMsgOption0(int fd, int[] retVals) throws IOException; static native void setInitMsgOption0(int fd, int arg1, int arg2) throws IOException; static native void shutdown0(int fd, int assocId); static native void init(); static { init(); } }