src/java.base/share/classes/sun/nio/ch/SocketOptionRegistry.java.template

/*
 * Copyright (c) 2008, 2020, 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
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@@END_COPYRIGHT@@

#include <stdio.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif

/* Defines SO_REUSEPORT */
#if !defined(SO_REUSEPORT)
#ifdef _WIN32
#define SO_REUSEPORT 0
#elif defined(__linux__)
#define SO_REUSEPORT 15
#elif defined(AIX) || defined(MACOSX)
#define SO_REUSEPORT 0x0200
#else
#define SO_REUSEPORT 0
#endif
#endif

/* To be able to name the Java constants the same as the C constants without
   having the preprocessor rewrite those identifiers, add PREFIX_ to all
   identifiers matching a C constant. The PREFIX_ is filtered out in the
   makefile. */

@@START_HERE@@

package sun.nio.ch;
import java.net.SocketOption;
import java.net.StandardSocketOptions;
import java.net.ProtocolFamily;
import java.net.StandardProtocolFamily;
import java.util.Map;
import java.util.HashMap;
class SocketOptionRegistry {

    private SocketOptionRegistry() { }

    private static class RegistryKey {
        private final SocketOption<?> name;
        private final ProtocolFamily family;
        RegistryKey(SocketOption<?> name, ProtocolFamily family) {
            this.name = name;
            this.family = family;
        }
        public int hashCode() {
            return name.hashCode() + family.hashCode();
        }
        public boolean equals(Object ob) {
            if (ob == null) return false;
            if (!(ob instanceof RegistryKey)) return false;
            RegistryKey other = (RegistryKey)ob;
            if (this.name != other.name) return false;
            if (this.family != other.family) return false;
            return true;
        }
    }

    private static class LazyInitialization {

        static final Map<RegistryKey,OptionKey> options = options();

        private static Map<RegistryKey,OptionKey> options() {
            Map<RegistryKey,OptionKey> map =
                new HashMap<RegistryKey,OptionKey>();
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_BROADCAST,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_BROADCAST));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_KEEPALIVE,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_KEEPALIVE));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_LINGER,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_LINGER));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_SNDBUF,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_SNDBUF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_RCVBUF,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_RCVBUF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_REUSEADDR,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_REUSEADDR));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_REUSEPORT,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_REUSEPORT));
            // IPPROTO_TCP is 6
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_TCP_NODELAY,
                Net.UNSPEC), new OptionKey(6, TCP_NODELAY));

            // IPPROTO_IP is 0
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_TOS,
                StandardProtocolFamily.INET), new OptionKey(0, IP_TOS));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_IF,
                StandardProtocolFamily.INET), new OptionKey(0, IP_MULTICAST_IF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_TTL,
                StandardProtocolFamily.INET), new OptionKey(0, IP_MULTICAST_TTL));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_LOOP,
                StandardProtocolFamily.INET), new OptionKey(0, IP_MULTICAST_LOOP));

#ifdef AF_INET6
            // IPPROTO_IPV6 is 41
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_TOS,
                StandardProtocolFamily.INET6), new OptionKey(41, IPV6_TCLASS));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_IF,
                StandardProtocolFamily.INET6), new OptionKey(41, IPV6_MULTICAST_IF));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_TTL,
                StandardProtocolFamily.INET6), new OptionKey(41, IPV6_MULTICAST_HOPS));
            map.put(new RegistryKey(StandardSocketOptions.PREFIX_IP_MULTICAST_LOOP,
                StandardProtocolFamily.INET6), new OptionKey(41, IPV6_MULTICAST_LOOP));
#endif

            map.put(new RegistryKey(ExtendedSocketOption.PREFIX_SO_OOBINLINE,
                Net.UNSPEC), new OptionKey(SOL_SOCKET, SO_OOBINLINE));
            return map;
        }
    }

    public static OptionKey findOption(SocketOption<?> name, ProtocolFamily family) {
        RegistryKey key = new RegistryKey(name, family);
        return LazyInitialization.options.get(key);
    }
}