https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2017, 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 java.net;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.io.Serializable;
import java.net.InetAddress;
import java.security.AccessController;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.PrivilegedAction;
import java.security.Security;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.StringJoiner;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;
import sun.net.util.IPAddressUtil;
import sun.net.PortConfig;
import sun.security.util.RegisteredDomain;
import sun.security.util.SecurityConstants;
import sun.security.util.Debug;



This class represents access to a network via sockets.
A SocketPermission consists of a
host specification and a set of "actions" specifying ways to
connect to that host. The host is specified as

   host = (hostname | IPv4address | iPv6reference) [:portrange]
   portrange = portnumber | -portnumber | portnumber-[portnumber]


The host is expressed as a DNS name, as a numerical IP address,
or as "localhost" (for the local machine).
The wildcard "*" may be included once in a DNS name host
specification. If it is included, it must be in the leftmost
position, as in "*.sun.com".


The format of the IPv6reference should follow that specified in RFC 2732: Format
for Literal IPv6 Addresses in URLs:

   ipv6reference = "[" IPv6address "]"


For example, you can construct a SocketPermission instance
as the following:

   String hostAddress = inetaddress.getHostAddress();
   if (inetaddress instanceof Inet6Address) {
       sp = new SocketPermission("[" + hostAddress + "]:" + port, action);
   } else {
       sp = new SocketPermission(hostAddress + ":" + port, action);
   }


or

   String host = url.getHost();
   sp = new SocketPermission(host + ":" + port, action);




The full uncompressed form of
an IPv6 literal address is also valid.


The port or portrange is optional. A port specification of the
form "N-", where N is a port number, signifies all ports
numbered N and above, while a specification of the
form "-N" indicates all ports numbered N and below. The special port value 0 refers to the entire ephemeral
port range. This is a fixed range of ports a system may use to
allocate dynamic ports from. The actual range may be system dependent.


The possible ways to connect to the host are

accept
connect
listen
resolve


The "listen" action is only meaningful when used with "localhost" and
means the ability to bind to a specified port.
The "resolve" action is implied when any of the other actions are present.
The action "resolve" refers to host/ip name service lookups.


The actions string is converted to lowercase before processing.

As an example of the creation and meaning of SocketPermissions,
note that if the following permission:

  p1 = new SocketPermission("puffin.eng.sun.com:7777", "connect,accept");

 is granted to some code, it allows that code to connect to port 7777 on puffin.eng.sun.com, and to accept connections on that port. 
Similarly, if the following permission:

  p2 = new SocketPermission("localhost:1024-", "accept,connect,listen");


is granted to some code, it allows that code to
accept connections on, connect to, or listen on any port between
1024 and 65535 on the local host.

Note: Granting code permission to accept or make connections to remote
hosts may be dangerous because malevolent code can then more easily
transfer and share confidential data among parties who may not
otherwise have access to the data.

Author:Marianne Mueller, Roland Schemers
See Also:
Since:1.2
@serialexclude
/**
 * This class represents access to a network via sockets.
 * A SocketPermission consists of a
 * host specification and a set of "actions" specifying ways to
 * connect to that host. The host is specified as
 * <pre>
 *    host = (hostname | IPv4address | iPv6reference) [:portrange]
 *    portrange = portnumber | -portnumber | portnumber-[portnumber]
 * </pre>
 * The host is expressed as a DNS name, as a numerical IP address,
 * or as "localhost" (for the local machine).
 * The wildcard "*" may be included once in a DNS name host
 * specification. If it is included, it must be in the leftmost
 * position, as in "*.sun.com".
 * <p>
 * The format of the IPv6reference should follow that specified in <a
 * href="http://www.ietf.org/rfc/rfc2732.txt"><i>RFC&nbsp;2732: Format
 * for Literal IPv6 Addresses in URLs</i></a>:
 * <pre>
 *    ipv6reference = "[" IPv6address "]"
 *</pre>
 * For example, you can construct a SocketPermission instance
 * as the following:
 * <pre>
 *    String hostAddress = inetaddress.getHostAddress();
 *    if (inetaddress instanceof Inet6Address) {
 *        sp = new SocketPermission("[" + hostAddress + "]:" + port, action);
 *    } else {
 *        sp = new SocketPermission(hostAddress + ":" + port, action);
 *    }
 * </pre>
 * or
 * <pre>
 *    String host = url.getHost();
 *    sp = new SocketPermission(host + ":" + port, action);
 * </pre>
 * <p>
 * The <A HREF="Inet6Address.html#lform">full uncompressed form</A> of
 * an IPv6 literal address is also valid.
 * <p>
 * The port or portrange is optional. A port specification of the
 * form "N-", where <i>N</i> is a port number, signifies all ports
 * numbered <i>N</i> and above, while a specification of the
 * form "-N" indicates all ports numbered <i>N</i> and below.
 * The special port value {@code 0} refers to the entire <i>ephemeral</i>
 * port range. This is a fixed range of ports a system may use to
 * allocate dynamic ports from. The actual range may be system dependent.
 * <p>
 * The possible ways to connect to the host are
 * <pre>
 * accept
 * connect
 * listen
 * resolve
 * </pre>
 * The "listen" action is only meaningful when used with "localhost" and
 * means the ability to bind to a specified port.
 * The "resolve" action is implied when any of the other actions are present.
 * The action "resolve" refers to host/ip name service lookups.
 * <P>
 * The actions string is converted to lowercase before processing.
 * <p>As an example of the creation and meaning of SocketPermissions,
 * note that if the following permission:
 *
 * <pre>
 *   p1 = new SocketPermission("puffin.eng.sun.com:7777", "connect,accept");
 * </pre>
 *
 * is granted to some code, it allows that code to connect to port 7777 on
 * {@code puffin.eng.sun.com}, and to accept connections on that port.
 *
 * <p>Similarly, if the following permission:
 *
 * <pre>
 *   p2 = new SocketPermission("localhost:1024-", "accept,connect,listen");
 * </pre>
 *
 * is granted to some code, it allows that code to
 * accept connections on, connect to, or listen on any port between
 * 1024 and 65535 on the local host.
 *
 * <p>Note: Granting code permission to accept or make connections to remote
 * hosts may be dangerous because malevolent code can then more easily
 * transfer and share confidential data among parties who may not
 * otherwise have access to the data.
 *
 * @see java.security.Permissions
 * @see SocketPermission
 *
 *
 * @author Marianne Mueller
 * @author Roland Schemers
 * @since 1.2
 *
 * @serial exclude
 */

public final class SocketPermission extends Permission
    implements java.io.Serializable
{
    private static final long serialVersionUID = -7204263841984476862L;

    
Connect to host:port

/**
     * Connect to host:port
     */
    private static final int CONNECT    = 0x1;

    
Listen on host:port

/**
     * Listen on host:port
     */
    private static final int LISTEN     = 0x2;

    
Accept a connection from host:port

/**
     * Accept a connection from host:port
     */
    private static final int ACCEPT     = 0x4;

    
Resolve DNS queries

/**
     * Resolve DNS queries
     */
    private static final int RESOLVE    = 0x8;

    
No actions

/**
     * No actions
     */
    private static final int NONE               = 0x0;

    
All actions

/**
     * All actions
     */
    private static final int ALL        = CONNECT|LISTEN|ACCEPT|RESOLVE;

    // various port constants
    private static final int PORT_MIN = 0;
    private static final int PORT_MAX = 65535;
    private static final int PRIV_PORT_MAX = 1023;
    private static final int DEF_EPH_LOW = 49152;

    // the actions mask
    private transient int mask;

    
the actions string.

@serial
/**
     * the actions string.
     *
     * @serial
     */

    private String actions; // Left null as long as possible, then
                            // created and re-used in the getAction function.

    // hostname part as it is passed
    private transient String hostname;

    // the canonical name of the host
    // in the case of "*.foo.com", cname is ".foo.com".

    private transient String cname;

    // all the IP addresses of the host
    private transient InetAddress[] addresses;

    // true if the hostname is a wildcard (e.g. "*.sun.com")
    private transient boolean wildcard;

    // true if we were initialized with a single numeric IP address
    private transient boolean init_with_ip;

    // true if this SocketPermission represents an invalid/unknown host
    // used for implies when the delayed lookup has already failed
    private transient boolean invalid;

    // port range on host
    private transient int[] portrange;

    private transient boolean defaultDeny = false;

    // true if this SocketPermission represents a hostname
    // that failed our reverse mapping heuristic test
    private transient boolean untrusted;
    private transient boolean trusted;

    // true if the sun.net.trustNameService system property is set
    private static boolean trustNameService;

    private static Debug debug = null;
    private static boolean debugInit = false;

    // lazy initializer
    private static class EphemeralRange {
        static final int low = initEphemeralPorts("low", DEF_EPH_LOW);
            static final int high = initEphemeralPorts("high", PORT_MAX);
    };

    static {
        Boolean tmp = java.security.AccessController.doPrivileged(
                new sun.security.action.GetBooleanAction("sun.net.trustNameService"));
        trustNameService = tmp.booleanValue();
    }

    private static synchronized Debug getDebug() {
        if (!debugInit) {
            debug = Debug.getInstance("access");
            debugInit = true;
        }
        return debug;
    }

    
Creates a new SocketPermission object with the specified actions.
The host is expressed as a DNS name, or as a numerical IP address.
Optionally, a port or a portrange may be supplied (separated
from the DNS name or IP address by a colon).


To specify the local machine, use "localhost" as the host.
Also note: An empty host String ("") is equivalent to "localhost".


The actions parameter contains a comma-separated list of the
actions granted for the specified host (and port(s)). Possible actions are
"connect", "listen", "accept", "resolve", or
any combination of those. "resolve" is automatically added
when any of the other three are specified.


Examples of SocketPermission instantiation are the following:

   nr = new SocketPermission("www.catalog.com", "connect");
   nr = new SocketPermission("www.sun.com:80", "connect");
   nr = new SocketPermission("*.sun.com", "connect");
   nr = new SocketPermission("*.edu", "resolve");
   nr = new SocketPermission("204.160.241.0", "connect");
   nr = new SocketPermission("localhost:1024-65535", "listen");
   nr = new SocketPermission("204.160.241.0:1024-65535", "connect");



Params:
  • host – the hostname or IPaddress of the computer, optionally
including a colon followed by a port or port range.
  • action – the action string.
/**
     * Creates a new SocketPermission object with the specified actions.
     * The host is expressed as a DNS name, or as a numerical IP address.
     * Optionally, a port or a portrange may be supplied (separated
     * from the DNS name or IP address by a colon).
     * <p>
     * To specify the local machine, use "localhost" as the <i>host</i>.
     * Also note: An empty <i>host</i> String ("") is equivalent to "localhost".
     * <p>
     * The <i>actions</i> parameter contains a comma-separated list of the
     * actions granted for the specified host (and port(s)). Possible actions are
     * "connect", "listen", "accept", "resolve", or
     * any combination of those. "resolve" is automatically added
     * when any of the other three are specified.
     * <p>
     * Examples of SocketPermission instantiation are the following:
     * <pre>
     *    nr = new SocketPermission("www.catalog.com", "connect");
     *    nr = new SocketPermission("www.sun.com:80", "connect");
     *    nr = new SocketPermission("*.sun.com", "connect");
     *    nr = new SocketPermission("*.edu", "resolve");
     *    nr = new SocketPermission("204.160.241.0", "connect");
     *    nr = new SocketPermission("localhost:1024-65535", "listen");
     *    nr = new SocketPermission("204.160.241.0:1024-65535", "connect");
     * </pre>
     *
     * @param host the hostname or IPaddress of the computer, optionally
     * including a colon followed by a port or port range.
     * @param action the action string.
     */
    public SocketPermission(String host, String action) {
        super(getHost(host));
        // name initialized to getHost(host); NPE detected in getHost()
        init(getName(), getMask(action));
    }


    SocketPermission(String host, int mask) {
        super(getHost(host));
        // name initialized to getHost(host); NPE detected in getHost()
        init(getName(), mask);
    }

    private void setDeny() {
        defaultDeny = true;
    }

    private static String getHost(String host) {
        if (host.equals("")) {
            return "localhost";
        } else {
            /* IPv6 literal address used in this context should follow
             * the format specified in RFC 2732;
             * if not, we try to solve the unambiguous case
             */
            int ind;
            if (host.charAt(0) != '[') {
                if ((ind = host.indexOf(':')) != host.lastIndexOf(':')) {
                    /* More than one ":", meaning IPv6 address is not
                     * in RFC 2732 format;
                     * We will rectify user errors for all unambiguious cases
                     */
                    StringTokenizer st = new StringTokenizer(host, ":");
                    int tokens = st.countTokens();
                    if (tokens == 9) {
                        // IPv6 address followed by port
                        ind = host.lastIndexOf(':');
                        host = "[" + host.substring(0, ind) + "]" +
                            host.substring(ind);
                    } else if (tokens == 8 && host.indexOf("::") == -1) {
                        // IPv6 address only, not followed by port
                        host = "[" + host + "]";
                    } else {
                        // could be ambiguous
                        throw new IllegalArgumentException("Ambiguous"+
                                                           " hostport part");
                    }
                }
            }
            return host;
        }
    }

    private int[] parsePort(String port)
        throws Exception
    {

        if (port == null || port.equals("") || port.equals("*")) {
            return new int[] {PORT_MIN, PORT_MAX};
        }

        int dash = port.indexOf('-');

        if (dash == -1) {
            int p = Integer.parseInt(port);
            return new int[] {p, p};
        } else {
            String low = port.substring(0, dash);
            String high = port.substring(dash+1);
            int l,h;

            if (low.equals("")) {
                l = PORT_MIN;
            } else {
                l = Integer.parseInt(low);
            }

            if (high.equals("")) {
                h = PORT_MAX;
            } else {
                h = Integer.parseInt(high);
            }
            if (l < 0 || h < 0 || h<l)
                throw new IllegalArgumentException("invalid port range");

            return new int[] {l, h};
        }
    }

    
Returns true if the permission has specified zero
as its value (or lower bound) signifying the ephemeral range

/**
     * Returns true if the permission has specified zero
     * as its value (or lower bound) signifying the ephemeral range
     */
    private boolean includesEphemerals() {
        return portrange[0] == 0;
    }

    
Initialize the SocketPermission object. We don't do any DNS lookups
as this point, instead we hold off until the implies method is
called.

/**
     * Initialize the SocketPermission object. We don't do any DNS lookups
     * as this point, instead we hold off until the implies method is
     * called.
     */
    private void init(String host, int mask) {
        // Set the integer mask that represents the actions

        if ((mask & ALL) != mask)
            throw new IllegalArgumentException("invalid actions mask");

        // always OR in RESOLVE if we allow any of the others
        this.mask = mask | RESOLVE;

        // Parse the host name.  A name has up to three components, the
        // hostname, a port number, or two numbers representing a port
        // range.   "www.sun.com:8080-9090" is a valid host name.

        // With IPv6 an address can be 2010:836B:4179::836B:4179
        // An IPv6 address needs to be enclose in []
        // For ex: [2010:836B:4179::836B:4179]:8080-9090
        // Refer to RFC 2732 for more information.

        int rb = 0 ;
        int start = 0, end = 0;
        int sep = -1;
        String hostport = host;
        if (host.charAt(0) == '[') {
            start = 1;
            rb = host.indexOf(']');
            if (rb != -1) {
                host = host.substring(start, rb);
            } else {
                throw new
                    IllegalArgumentException("invalid host/port: "+host);
            }
            sep = hostport.indexOf(':', rb+1);
        } else {
            start = 0;
            sep = host.indexOf(':', rb);
            end = sep;
            if (sep != -1) {
                host = host.substring(start, end);
            }
        }

        if (sep != -1) {
            String port = hostport.substring(sep+1);
            try {
                portrange = parsePort(port);
            } catch (Exception e) {
                throw new
                    IllegalArgumentException("invalid port range: "+port);
            }
        } else {
            portrange = new int[] { PORT_MIN, PORT_MAX };
        }

        hostname = host;

        // is this a domain wildcard specification
        if (host.lastIndexOf('*') > 0) {
            throw new
               IllegalArgumentException("invalid host wildcard specification");
        } else if (host.startsWith("*")) {
            wildcard = true;
            if (host.equals("*")) {
                cname = "";
            } else if (host.startsWith("*.")) {
                cname = host.substring(1).toLowerCase();
            } else {
              throw new
               IllegalArgumentException("invalid host wildcard specification");
            }
            return;
        } else {
            if (!host.isEmpty()) {
                // see if we are being initialized with an IP address.
                char ch = host.charAt(0);
                if (ch == ':' || Character.digit(ch, 16) != -1) {
                    byte ip[] = IPAddressUtil.textToNumericFormatV4(host);
                    if (ip == null) {
                        ip = IPAddressUtil.textToNumericFormatV6(host);
                    }
                    if (ip != null) {
                        try {
                            addresses =
                                new InetAddress[]
                                {InetAddress.getByAddress(ip) };
                            init_with_ip = true;
                        } catch (UnknownHostException uhe) {
                            // this shouldn't happen
                            invalid = true;
                        }
                    }
                }
            }
        }
    }

    
Convert an action string to an integer actions mask.

Params:
  • action – the action string
Returns:the action mask
/**
     * Convert an action string to an integer actions mask.
     *
     * @param action the action string
     * @return the action mask
     */
    private static int getMask(String action) {

        if (action == null) {
            throw new NullPointerException("action can't be null");
        }

        if (action.equals("")) {
            throw new IllegalArgumentException("action can't be empty");
        }

        int mask = NONE;

        // Use object identity comparison against known-interned strings for
        // performance benefit (these values are used heavily within the JDK).
        if (action == SecurityConstants.SOCKET_RESOLVE_ACTION) {
            return RESOLVE;
        } else if (action == SecurityConstants.SOCKET_CONNECT_ACTION) {
            return CONNECT;
        } else if (action == SecurityConstants.SOCKET_LISTEN_ACTION) {
            return LISTEN;
        } else if (action == SecurityConstants.SOCKET_ACCEPT_ACTION) {
            return ACCEPT;
        } else if (action == SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION) {
            return CONNECT|ACCEPT;
        }

        char[] a = action.toCharArray();

        int i = a.length - 1;
        if (i < 0)
            return mask;

        while (i != -1) {
            char c;

            // skip whitespace
            while ((i!=-1) && ((c = a[i]) == ' ' ||
                               c == '\r' ||
                               c == '\n' ||
                               c == '\f' ||
                               c == '\t'))
                i--;

            // check for the known strings
            int matchlen;

            if (i >= 6 && (a[i-6] == 'c' || a[i-6] == 'C') &&
                          (a[i-5] == 'o' || a[i-5] == 'O') &&
                          (a[i-4] == 'n' || a[i-4] == 'N') &&
                          (a[i-3] == 'n' || a[i-3] == 'N') &&
                          (a[i-2] == 'e' || a[i-2] == 'E') &&
                          (a[i-1] == 'c' || a[i-1] == 'C') &&
                          (a[i] == 't' || a[i] == 'T'))
            {
                matchlen = 7;
                mask |= CONNECT;

            } else if (i >= 6 && (a[i-6] == 'r' || a[i-6] == 'R') &&
                                 (a[i-5] == 'e' || a[i-5] == 'E') &&
                                 (a[i-4] == 's' || a[i-4] == 'S') &&
                                 (a[i-3] == 'o' || a[i-3] == 'O') &&
                                 (a[i-2] == 'l' || a[i-2] == 'L') &&
                                 (a[i-1] == 'v' || a[i-1] == 'V') &&
                                 (a[i] == 'e' || a[i] == 'E'))
            {
                matchlen = 7;
                mask |= RESOLVE;

            } else if (i >= 5 && (a[i-5] == 'l' || a[i-5] == 'L') &&
                                 (a[i-4] == 'i' || a[i-4] == 'I') &&
                                 (a[i-3] == 's' || a[i-3] == 'S') &&
                                 (a[i-2] == 't' || a[i-2] == 'T') &&
                                 (a[i-1] == 'e' || a[i-1] == 'E') &&
                                 (a[i] == 'n' || a[i] == 'N'))
            {
                matchlen = 6;
                mask |= LISTEN;

            } else if (i >= 5 && (a[i-5] == 'a' || a[i-5] == 'A') &&
                                 (a[i-4] == 'c' || a[i-4] == 'C') &&
                                 (a[i-3] == 'c' || a[i-3] == 'C') &&
                                 (a[i-2] == 'e' || a[i-2] == 'E') &&
                                 (a[i-1] == 'p' || a[i-1] == 'P') &&
                                 (a[i] == 't' || a[i] == 'T'))
            {
                matchlen = 6;
                mask |= ACCEPT;

            } else {
                // parse error
                throw new IllegalArgumentException(
                        "invalid permission: " + action);
            }

            // make sure we didn't just match the tail of a word
            // like "ackbarfaccept".  Also, skip to the comma.
            boolean seencomma = false;
            while (i >= matchlen && !seencomma) {
                switch(a[i-matchlen]) {
                case ',':
                    seencomma = true;
                    break;
                case ' ': case '\r': case '\n':
                case '\f': case '\t':
                    break;
                default:
                    throw new IllegalArgumentException(
                            "invalid permission: " + action);
                }
                i--;
            }

            // point i at the location of the comma minus one (or -1).
            i -= matchlen;
        }

        return mask;
    }

    private boolean isUntrusted()
        throws UnknownHostException
    {
        if (trusted) return false;
        if (invalid || untrusted) return true;
        try {
            if (!trustNameService && (defaultDeny ||
                sun.net.www.URLConnection.isProxiedHost(hostname))) {
                if (this.cname == null) {
                    this.getCanonName();
                }
                if (!match(cname, hostname)) {
                    // Last chance
                    if (!authorized(hostname, addresses[0].getAddress())) {
                        untrusted = true;
                        Debug debug = getDebug();
                        if (debug != null && Debug.isOn("failure")) {
                            debug.println("socket access restriction: proxied host " + "(" + addresses[0] + ")" + " does not match " + cname + " from reverse lookup");
                        }
                        return true;
                    }
                }
                trusted = true;
            }
        } catch (UnknownHostException uhe) {
            invalid = true;
            throw uhe;
        }
        return false;
    }

    
attempt to get the fully qualified domain name

/**
     * attempt to get the fully qualified domain name
     *
     */
    void getCanonName()
        throws UnknownHostException
    {
        if (cname != null || invalid || untrusted) return;

        // attempt to get the canonical name

        try {
            // first get the IP addresses if we don't have them yet
            // this is because we need the IP address to then get
            // FQDN.
            if (addresses == null) {
                getIP();
            }

            // we have to do this check, otherwise we might not
            // get the fully qualified domain name
            if (init_with_ip) {
                cname = addresses[0].getHostName(false).toLowerCase();
            } else {
             cname = InetAddress.getByName(addresses[0].getHostAddress()).
                                              getHostName(false).toLowerCase();
            }
        } catch (UnknownHostException uhe) {
            invalid = true;
            throw uhe;
        }
    }

    private transient String cdomain, hdomain;

    
previously we allowed domain names to be specified in IDN ACE form
Need to check for that and convert to Unicode

/**
     * previously we allowed domain names to be specified in IDN ACE form
     * Need to check for that and convert to Unicode
     */
    private static String checkForIDN(String name) {
        if (name.startsWith("xn--") || name.contains(".xn--")) {
            return IDN.toUnicode(name);
        } else {
            return name;
        }
    }

    private boolean match(String cname, String hname) {
        String a = checkForIDN(cname.toLowerCase());
        String b = checkForIDN(hname.toLowerCase());
        if (a.startsWith(b)  &&
            ((a.length() == b.length()) || (a.charAt(b.length()) == '.'))) {
            return true;
        }
        if (cdomain == null) {
            cdomain = RegisteredDomain.from(a)
                                      .map(RegisteredDomain::name)
                                      .orElse(a);
        }
        if (hdomain == null) {
            hdomain = RegisteredDomain.from(b)
                                      .map(RegisteredDomain::name)
                                      .orElse(b);
        }

        return !cdomain.isEmpty() && !hdomain.isEmpty() && cdomain.equals(hdomain);
    }

    private boolean authorized(String cname, byte[] addr) {
        if (addr.length == 4)
            return authorizedIPv4(cname, addr);
        else if (addr.length == 16)
            return authorizedIPv6(cname, addr);
        else
            return false;
    }

    private boolean authorizedIPv4(String cname, byte[] addr) {
        String authHost = "";
        InetAddress auth;

        try {
            authHost = "auth." +
                        (addr[3] & 0xff) + "." + (addr[2] & 0xff) + "." +
                        (addr[1] & 0xff) + "." + (addr[0] & 0xff) +
                        ".in-addr.arpa";
            // Following check seems unnecessary
            // auth = InetAddress.getAllByName0(authHost, false)[0];
            authHost = hostname + '.' + authHost;
            auth = InetAddress.getAllByName0(authHost, false)[0];
            if (auth.equals(InetAddress.getByAddress(addr))) {
                return true;
            }
            Debug debug = getDebug();
            if (debug != null && Debug.isOn("failure")) {
                debug.println("socket access restriction: IP address of " + auth + " != " + InetAddress.getByAddress(addr));
            }
        } catch (UnknownHostException uhe) {
            Debug debug = getDebug();
            if (debug != null && Debug.isOn("failure")) {
                debug.println("socket access restriction: forward lookup failed for " + authHost);
            }
        }
        return false;
    }

    private boolean authorizedIPv6(String cname, byte[] addr) {
        String authHost = "";
        InetAddress auth;

        try {
            StringBuilder sb = new StringBuilder(39);

            for (int i = 15; i >= 0; i--) {
                sb.append(Integer.toHexString(((addr[i]) & 0x0f)));
                sb.append('.');
                sb.append(Integer.toHexString(((addr[i] >> 4) & 0x0f)));
                sb.append('.');
            }
            authHost = "auth." + sb.toString() + "IP6.ARPA";
            //auth = InetAddress.getAllByName0(authHost, false)[0];
            authHost = hostname + '.' + authHost;
            auth = InetAddress.getAllByName0(authHost, false)[0];
            if (auth.equals(InetAddress.getByAddress(addr)))
                return true;
            Debug debug = getDebug();
            if (debug != null && Debug.isOn("failure")) {
                debug.println("socket access restriction: IP address of " + auth + " != " + InetAddress.getByAddress(addr));
            }
        } catch (UnknownHostException uhe) {
            Debug debug = getDebug();
            if (debug != null && Debug.isOn("failure")) {
                debug.println("socket access restriction: forward lookup failed for " + authHost);
            }
        }
        return false;
    }


    
get IP addresses. Sets invalid to true if we can't get them.

/**
     * get IP addresses. Sets invalid to true if we can't get them.
     *
     */
    void getIP()
        throws UnknownHostException
    {
        if (addresses != null || wildcard || invalid) return;

        try {
            // now get all the IP addresses
            String host;
            if (getName().charAt(0) == '[') {
                // Literal IPv6 address
                host = getName().substring(1, getName().indexOf(']'));
            } else {
                int i = getName().indexOf(':');
                if (i == -1)
                    host = getName();
                else {
                    host = getName().substring(0,i);
                }
            }

            addresses =
                new InetAddress[] {InetAddress.getAllByName0(host, false)[0]};

        } catch (UnknownHostException uhe) {
            invalid = true;
            throw uhe;
        }  catch (IndexOutOfBoundsException iobe) {
            invalid = true;
            throw new UnknownHostException(getName());
        }
    }

    
Checks if this socket permission object "implies" the
specified permission.


More specifically, this method first ensures that all of the following
are true (and returns false if any of them are not):

    

  •  p is an instanceof SocketPermission,

  •  p's actions are a proper subset of this
object's actions, and

  •  p's port range is included in this port range. Note:
port range is ignored when p only contains the action, 'resolve'.

 Then implies checks each of the following, in order, and for each returns true if the stated condition is true: 
    

  •  If this object was initialized with a single IP address and one of p's
IP addresses is equal to this object's IP address.

  • If this object is a wildcard domain (such as *.sun.com), and
p's canonical name (the name without any preceding *)
ends with this object's canonical host name. For example, *.sun.com
implies *.eng.sun.com.

  • If this object was not initialized with a single IP address, and one of this
object's IP addresses equals one of p's IP addresses.

  • If this canonical name equals p's canonical name.

 If none of the above are true, implies returns false. 
Params:
  • p – the permission to check against.
Returns:true if the specified permission is implied by this object,
false if not.
/**
     * Checks if this socket permission object "implies" the
     * specified permission.
     * <P>
     * More specifically, this method first ensures that all of the following
     * are true (and returns false if any of them are not):
     * <ul>
     * <li> <i>p</i> is an instanceof SocketPermission,
     * <li> <i>p</i>'s actions are a proper subset of this
     * object's actions, and
     * <li> <i>p</i>'s port range is included in this port range. Note:
     * port range is ignored when p only contains the action, 'resolve'.
     * </ul>
     *
     * Then {@code implies} checks each of the following, in order,
     * and for each returns true if the stated condition is true:
     * <ul>
     * <li> If this object was initialized with a single IP address and one of <i>p</i>'s
     * IP addresses is equal to this object's IP address.
     * <li>If this object is a wildcard domain (such as *.sun.com), and
     * <i>p</i>'s canonical name (the name without any preceding *)
     * ends with this object's canonical host name. For example, *.sun.com
     * implies *.eng.sun.com.
     * <li>If this object was not initialized with a single IP address, and one of this
     * object's IP addresses equals one of <i>p</i>'s IP addresses.
     * <li>If this canonical name equals <i>p</i>'s canonical name.
     * </ul>
     *
     * If none of the above are true, {@code implies} returns false.
     * @param p the permission to check against.
     *
     * @return true if the specified permission is implied by this object,
     * false if not.
     */
    @Override
    public boolean implies(Permission p) {
        int i,j;

        if (!(p instanceof SocketPermission))
            return false;

        if (p == this)
            return true;

        SocketPermission that = (SocketPermission) p;

        return ((this.mask & that.mask) == that.mask) &&
                                        impliesIgnoreMask(that);
    }

    
Checks if the incoming Permission's action are a proper subset of
the this object's actions.


Check, in the following order:

    

  •  Checks that "p" is an instanceof a SocketPermission

  •  Checks that "p"'s actions are a proper subset of the
current object's actions.

  •  Checks that "p"'s port range is included in this port range

  •  If this object was initialized with an IP address, checks that
     one of "p"'s IP addresses is equal to this object's IP address.

  •  If either object is a wildcard domain (i.e., "*.sun.com"),
     attempt to match based on the wildcard.

  •  If this object was not initialized with an IP address, attempt
     to find a match based on the IP addresses in both objects.

  •  Attempt to match on the canonical hostnames of both objects.



Params:
  • that – the incoming permission request
Returns:true if "permission" is a proper subset of the current object,
false if not.
/**
     * Checks if the incoming Permission's action are a proper subset of
     * the this object's actions.
     * <P>
     * Check, in the following order:
     * <ul>
     * <li> Checks that "p" is an instanceof a SocketPermission
     * <li> Checks that "p"'s actions are a proper subset of the
     * current object's actions.
     * <li> Checks that "p"'s port range is included in this port range
     * <li> If this object was initialized with an IP address, checks that
     *      one of "p"'s IP addresses is equal to this object's IP address.
     * <li> If either object is a wildcard domain (i.e., "*.sun.com"),
     *      attempt to match based on the wildcard.
     * <li> If this object was not initialized with an IP address, attempt
     *      to find a match based on the IP addresses in both objects.
     * <li> Attempt to match on the canonical hostnames of both objects.
     * </ul>
     * @param that the incoming permission request
     *
     * @return true if "permission" is a proper subset of the current object,
     * false if not.
     */
    boolean impliesIgnoreMask(SocketPermission that) {
        int i,j;

        if ((that.mask & RESOLVE) != that.mask) {

            // check simple port range
            if ((that.portrange[0] < this.portrange[0]) ||
                    (that.portrange[1] > this.portrange[1])) {

                // if either includes the ephemeral range, do full check
                if (this.includesEphemerals() || that.includesEphemerals()) {
                    if (!inRange(this.portrange[0], this.portrange[1],
                                     that.portrange[0], that.portrange[1]))
                    {
                                return false;
                    }
                } else {
                    return false;
                }
            }
        }

        // allow a "*" wildcard to always match anything
        if (this.wildcard && "".equals(this.cname))
            return true;

        // return if either one of these NetPerm objects are invalid...
        if (this.invalid || that.invalid) {
            return compareHostnames(that);
        }

        try {
            if (this.init_with_ip) { // we only check IP addresses
                if (that.wildcard)
                    return false;

                if (that.init_with_ip) {
                    return (this.addresses[0].equals(that.addresses[0]));
                } else {
                    if (that.addresses == null) {
                        that.getIP();
                    }
                    for (i=0; i < that.addresses.length; i++) {
                        if (this.addresses[0].equals(that.addresses[i]))
                            return true;
                    }
                }
                // since "this" was initialized with an IP address, we
                // don't check any other cases
                return false;
            }

            // check and see if we have any wildcards...
            if (this.wildcard || that.wildcard) {
                // if they are both wildcards, return true iff
                // that's cname ends with this cname (i.e., *.sun.com
                // implies *.eng.sun.com)
                if (this.wildcard && that.wildcard)
                    return (that.cname.endsWith(this.cname));

                // a non-wildcard can't imply a wildcard
                if (that.wildcard)
                    return false;

                // this is a wildcard, lets see if that's cname ends with
                // it...
                if (that.cname == null) {
                    that.getCanonName();
                }
                return (that.cname.endsWith(this.cname));
            }

            // comapare IP addresses
            if (this.addresses == null) {
                this.getIP();
            }

            if (that.addresses == null) {
                that.getIP();
            }

            if (!(that.init_with_ip && this.isUntrusted())) {
                for (j = 0; j < this.addresses.length; j++) {
                    for (i=0; i < that.addresses.length; i++) {
                        if (this.addresses[j].equals(that.addresses[i]))
                            return true;
                    }
                }

                // XXX: if all else fails, compare hostnames?
                // Do we really want this?
                if (this.cname == null) {
                    this.getCanonName();
                }

                if (that.cname == null) {
                    that.getCanonName();
                }

                return (this.cname.equalsIgnoreCase(that.cname));
            }

        } catch (UnknownHostException uhe) {
            return compareHostnames(that);
        }

        // make sure the first thing that is done here is to return
        // false. If not, uncomment the return false in the above catch.

        return false;
    }

    private boolean compareHostnames(SocketPermission that) {
        // we see if the original names/IPs passed in were equal.

        String thisHost = hostname;
        String thatHost = that.hostname;

        if (thisHost == null) {
            return false;
        } else if (this.wildcard) {
            final int cnameLength = this.cname.length();
            return thatHost.regionMatches(true,
                                          (thatHost.length() - cnameLength),
                                          this.cname, 0, cnameLength);
        } else {
            return thisHost.equalsIgnoreCase(thatHost);
        }
    }

    
Checks two SocketPermission objects for equality.

Params:
  • obj – the object to test for equality with this object.
Returns:true if obj is a SocketPermission, and has the
 same hostname, port range, and actions as this
 SocketPermission object. However, port range will be ignored
 in the comparison if obj only contains the action, 'resolve'.
/**
     * Checks two SocketPermission objects for equality.
     *
     * @param obj the object to test for equality with this object.
     *
     * @return true if <i>obj</i> is a SocketPermission, and has the
     *  same hostname, port range, and actions as this
     *  SocketPermission object. However, port range will be ignored
     *  in the comparison if <i>obj</i> only contains the action, 'resolve'.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this)
            return true;

        if (! (obj instanceof SocketPermission))
            return false;

        SocketPermission that = (SocketPermission) obj;

        //this is (overly?) complex!!!

        // check the mask first
        if (this.mask != that.mask) return false;

        if ((that.mask & RESOLVE) != that.mask) {
            // now check the port range...
            if ((this.portrange[0] != that.portrange[0]) ||
                (this.portrange[1] != that.portrange[1])) {
                return false;
            }
        }

        // short cut. This catches:
        //  "crypto" equal to "crypto", or
        // "1.2.3.4" equal to "1.2.3.4.", or
        //  "*.edu" equal to "*.edu", but it
        //  does not catch "crypto" equal to
        // "crypto.eng.sun.com".

        if (this.getName().equalsIgnoreCase(that.getName())) {
            return true;
        }

        // we now attempt to get the Canonical (FQDN) name and
        // compare that. If this fails, about all we can do is return
        // false.

        try {
            this.getCanonName();
            that.getCanonName();
        } catch (UnknownHostException uhe) {
            return false;
        }

        if (this.invalid || that.invalid)
            return false;

        if (this.cname != null) {
            return this.cname.equalsIgnoreCase(that.cname);
        }

        return false;
    }

    
Returns the hash code value for this object.

Returns:a hash code value for this object.
/**
     * Returns the hash code value for this object.
     *
     * @return a hash code value for this object.
     */
    @Override
    public int hashCode() {
        /*
         * If this SocketPermission was initialized with an IP address
         * or a wildcard, use getName().hashCode(), otherwise use
         * the hashCode() of the host name returned from
         * java.net.InetAddress.getHostName method.
         */

        if (init_with_ip || wildcard) {
            return this.getName().hashCode();
        }

        try {
            getCanonName();
        } catch (UnknownHostException uhe) {

        }

        if (invalid || cname == null)
            return this.getName().hashCode();
        else
            return this.cname.hashCode();
    }

    
Return the current action mask.

Returns:the actions mask.
/**
     * Return the current action mask.
     *
     * @return the actions mask.
     */

    int getMask() {
        return mask;
    }

    
Returns the "canonical string representation" of the actions in the
specified mask.
Always returns present actions in the following order:
connect, listen, accept, resolve.

Params:
  • mask – a specific integer action mask to translate into a string
Returns:the canonical string representation of the actions
/**
     * Returns the "canonical string representation" of the actions in the
     * specified mask.
     * Always returns present actions in the following order:
     * connect, listen, accept, resolve.
     *
     * @param mask a specific integer action mask to translate into a string
     * @return the canonical string representation of the actions
     */
    private static String getActions(int mask) {
        StringJoiner sj = new StringJoiner(",");
        if ((mask & CONNECT) == CONNECT) {
            sj.add("connect");
        }
        if ((mask & LISTEN) == LISTEN) {
            sj.add("listen");
        }
        if ((mask & ACCEPT) == ACCEPT) {
            sj.add("accept");
        }
        if ((mask & RESOLVE) == RESOLVE) {
            sj.add("resolve");
        }
        return sj.toString();
    }

    
Returns the canonical string representation of the actions.
Always returns present actions in the following order:
connect, listen, accept, resolve.

Returns:the canonical string representation of the actions.
/**
     * Returns the canonical string representation of the actions.
     * Always returns present actions in the following order:
     * connect, listen, accept, resolve.
     *
     * @return the canonical string representation of the actions.
     */
    @Override
    public String getActions()
    {
        if (actions == null)
            actions = getActions(this.mask);

        return actions;
    }

    
Returns a new PermissionCollection object for storing SocketPermission
objects.

 SocketPermission objects must be stored in a manner that allows them to be inserted into the collection in any order, but that also enables the PermissionCollection implies method to be implemented in an efficient (and consistent) manner. 
Returns:a new PermissionCollection object suitable for storing SocketPermissions.
/**
     * Returns a new PermissionCollection object for storing SocketPermission
     * objects.
     * <p>
     * SocketPermission objects must be stored in a manner that allows them
     * to be inserted into the collection in any order, but that also enables the
     * PermissionCollection {@code implies}
     * method to be implemented in an efficient (and consistent) manner.
     *
     * @return a new PermissionCollection object suitable for storing SocketPermissions.
     */
    @Override
    public PermissionCollection newPermissionCollection() {
        return new SocketPermissionCollection();
    }

    
WriteObject is called to save the state of the SocketPermission
to a stream. The actions are serialized, and the superclass
takes care of the name.

/**
     * WriteObject is called to save the state of the SocketPermission
     * to a stream. The actions are serialized, and the superclass
     * takes care of the name.
     */
    private synchronized void writeObject(java.io.ObjectOutputStream s)
        throws IOException
    {
        // Write out the actions. The superclass takes care of the name
        // call getActions to make sure actions field is initialized
        if (actions == null)
            getActions();
        s.defaultWriteObject();
    }

    
readObject is called to restore the state of the SocketPermission from
a stream.

/**
     * readObject is called to restore the state of the SocketPermission from
     * a stream.
     */
    private synchronized void readObject(java.io.ObjectInputStream s)
         throws IOException, ClassNotFoundException
    {
        // Read in the action, then initialize the rest
        s.defaultReadObject();
        init(getName(),getMask(actions));
    }

    
Check the system/security property for the ephemeral port range
for this system. The suffix is either "high" or "low"

/**
     * Check the system/security property for the ephemeral port range
     * for this system. The suffix is either "high" or "low"
     */
    private static int initEphemeralPorts(String suffix, int defval) {
        return AccessController.doPrivileged(
            new PrivilegedAction<>(){
                public Integer run() {
                    int val = Integer.getInteger(
                            "jdk.net.ephemeralPortRange."+suffix, -1
                    );
                    if (val != -1) {
                        return val;
                    } else {
                        return suffix.equals("low") ?
                            PortConfig.getLower() : PortConfig.getUpper();
                    }
                }
            }
        );
    }

    
Check if the target range is within the policy range
together with the ephemeral range for this platform
(if policy includes ephemeral range)

/**
     * Check if the target range is within the policy range
     * together with the ephemeral range for this platform
     * (if policy includes ephemeral range)
     */
    private static boolean inRange(
        int policyLow, int policyHigh, int targetLow, int targetHigh
    )
    {
        final int ephemeralLow = EphemeralRange.low;
        final int ephemeralHigh = EphemeralRange.high;

        if (targetLow == 0) {
            // check policy includes ephemeral range
            if (!inRange(policyLow, policyHigh, ephemeralLow, ephemeralHigh)) {
                return false;
            }
            if (targetHigh == 0) {
                // nothing left to do
                return true;
            }
            // continue check with first real port number
            targetLow = 1;
        }

        if (policyLow == 0 && policyHigh == 0) {
            // ephemeral range only
            return targetLow >= ephemeralLow && targetHigh <= ephemeralHigh;
        }

        if (policyLow != 0) {
            // simple check of policy only
            return targetLow >= policyLow && targetHigh <= policyHigh;
        }

        // policyLow == 0 which means possibly two ranges to check

        // first check if policy and ephem range overlap/contiguous

        if (policyHigh >= ephemeralLow - 1) {
            return targetHigh <= ephemeralHigh;
        }

        // policy and ephem range do not overlap

        // target range must lie entirely inside policy range or eph range

        return  (targetLow <= policyHigh && targetHigh <= policyHigh) ||
                (targetLow >= ephemeralLow && targetHigh <= ephemeralHigh);
    }
    /*
    public String toString()
    {
        StringBuffer s = new StringBuffer(super.toString() + "\n" +
            "cname = " + cname + "\n" +
            "wildcard = " + wildcard + "\n" +
            "invalid = " + invalid + "\n" +
            "portrange = " + portrange[0] + "," + portrange[1] + "\n");
        if (addresses != null) for (int i=0; i<addresses.length; i++) {
            s.append( addresses[i].getHostAddress());
            s.append("\n");
        } else {
            s.append("(no addresses)\n");
        }

        return s.toString();
    }

    public static void main(String args[]) throws Exception {
        SocketPermission this_ = new SocketPermission(args[0], "connect");
        SocketPermission that_ = new SocketPermission(args[1], "connect");
        System.out.println("-----\n");
        System.out.println("this.implies(that) = " + this_.implies(that_));
        System.out.println("-----\n");
        System.out.println("this = "+this_);
        System.out.println("-----\n");
        System.out.println("that = "+that_);
        System.out.println("-----\n");

        SocketPermissionCollection nps = new SocketPermissionCollection();
        nps.add(this_);
        nps.add(new SocketPermission("www-leland.stanford.edu","connect"));
        nps.add(new SocketPermission("www-sun.com","connect"));
        System.out.println("nps.implies(that) = " + nps.implies(that_));
        System.out.println("-----\n");
    }
    */
}


if (init'd with IP, key is IP as string)
if wildcard, its the wild card
else its the cname?

Author:Roland Schemers
See Also:
@serialinclude
/**

if (init'd with IP, key is IP as string)
if wildcard, its the wild card
else its the cname?

 *
 * @see java.security.Permission
 * @see java.security.Permissions
 * @see java.security.PermissionCollection
 *
 *
 * @author Roland Schemers
 *
 * @serial include
 */

final class SocketPermissionCollection extends PermissionCollection
    implements Serializable
{
    // Not serialized; see serialization section at end of class
    private transient Map<String, SocketPermission> perms;

    
Create an empty SocketPermissionCollection object.

/**
     * Create an empty SocketPermissionCollection object.
     */
    public SocketPermissionCollection() {
        perms = new ConcurrentHashMap<>();
    }

    
Adds a permission to the SocketPermissions. The key for the hash is
the name in the case of wildcards, or all the IP addresses.

Params:
  • permission – the Permission object to add.
Throws:
/**
     * Adds a permission to the SocketPermissions. The key for the hash is
     * the name in the case of wildcards, or all the IP addresses.
     *
     * @param permission the Permission object to add.
     *
     * @exception IllegalArgumentException - if the permission is not a
     *                                       SocketPermission
     *
     * @exception SecurityException - if this SocketPermissionCollection object
     *                                has been marked readonly
     */
    @Override
    public void add(Permission permission) {
        if (! (permission instanceof SocketPermission))
            throw new IllegalArgumentException("invalid permission: "+
                                               permission);
        if (isReadOnly())
            throw new SecurityException(
                "attempt to add a Permission to a readonly PermissionCollection");

        SocketPermission sp = (SocketPermission)permission;

        // Add permission to map if it is absent, or replace with new
        // permission if applicable. NOTE: cannot use lambda for
        // remappingFunction parameter until JDK-8076596 is fixed.
        perms.merge(sp.getName(), sp,
            new java.util.function.BiFunction<>() {
                @Override
                public SocketPermission apply(SocketPermission existingVal,
                                              SocketPermission newVal) {
                    int oldMask = existingVal.getMask();
                    int newMask = newVal.getMask();
                    if (oldMask != newMask) {
                        int effective = oldMask | newMask;
                        if (effective == newMask) {
                            return newVal;
                        }
                        if (effective != oldMask) {
                            return new SocketPermission(sp.getName(),
                                                        effective);
                        }
                    }
                    return existingVal;
                }
            }
        );
    }

    
Check and see if this collection of permissions implies the permissions
expressed in "permission".

Params:
  • permission – the Permission object to compare
Returns:true if "permission" is a proper subset of a permission in
the collection, false if not.
/**
     * Check and see if this collection of permissions implies the permissions
     * expressed in "permission".
     *
     * @param permission the Permission object to compare
     *
     * @return true if "permission" is a proper subset of a permission in
     * the collection, false if not.
     */
    @Override
    public boolean implies(Permission permission)
    {
        if (! (permission instanceof SocketPermission))
                return false;

        SocketPermission np = (SocketPermission) permission;

        int desired = np.getMask();
        int effective = 0;
        int needed = desired;

        var hit = perms.get(np.getName());
        if (hit != null) {
            // fastpath, if the host was explicitly listed
            if (((needed & hit.getMask()) != 0) && hit.impliesIgnoreMask(np)) {
                effective |= hit.getMask();
                if ((effective & desired) == desired) {
                    return true;
                }
                needed = (desired & ~effective);
            }
        }

        //System.out.println("implies "+np);
        for (SocketPermission x : perms.values()) {
            //System.out.println("  trying "+x);
            if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(np)) {
                effective |=  x.getMask();
                if ((effective & desired) == desired) {
                    return true;
                }
                needed = (desired ^ effective);
            }
        }
        return false;
    }

    
Returns an enumeration of all the SocketPermission objects in the
container.

Returns:an enumeration of all the SocketPermission objects.
/**
     * Returns an enumeration of all the SocketPermission objects in the
     * container.
     *
     * @return an enumeration of all the SocketPermission objects.
     */
    @Override
    @SuppressWarnings("unchecked")
    public Enumeration<Permission> elements() {
        return (Enumeration)Collections.enumeration(perms.values());
    }

    private static final long serialVersionUID = 2787186408602843674L;

    // Need to maintain serialization interoperability with earlier releases,
    // which had the serializable field:

    //
    // The SocketPermissions for this set.
    // @serial
    //
    // private Vector permissions;

    
@serialFieldpermissions java.util.Vector
    A list of the SocketPermissions for this set.
/**
     * @serialField permissions java.util.Vector
     *     A list of the SocketPermissions for this set.
     */
    private static final ObjectStreamField[] serialPersistentFields = {
        new ObjectStreamField("permissions", Vector.class),
    };

    
@serialData"permissions" field (a Vector containing the SocketPermissions).
/**
     * @serialData "permissions" field (a Vector containing the SocketPermissions).
     */
    /*
     * Writes the contents of the perms field out as a Vector for
     * serialization compatibility with earlier releases.
     */
    private void writeObject(ObjectOutputStream out) throws IOException {
        // Don't call out.defaultWriteObject()

        // Write out Vector
        Vector<SocketPermission> permissions = new Vector<>(perms.values());

        ObjectOutputStream.PutField pfields = out.putFields();
        pfields.put("permissions", permissions);
        out.writeFields();
    }

    /*
     * Reads in a Vector of SocketPermissions and saves them in the perms field.
     */
    private void readObject(ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        // Don't call in.defaultReadObject()

        // Read in serialized fields
        ObjectInputStream.GetField gfields = in.readFields();

        // Get the one we want
        @SuppressWarnings("unchecked")
        Vector<SocketPermission> permissions = (Vector<SocketPermission>)gfields.get("permissions", null);
        perms = new ConcurrentHashMap<>(permissions.size());
        for (SocketPermission sp : permissions) {
            perms.put(sp.getName(), sp);
        }
    }
}