Examples of java.net.SocketPermission$EphemeralRange

java.net.SocketPermission
etf.org/rfc/rfc2732.txt">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 {@code 0} refers to the entire ephemeralport 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 {@code 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. @see java.security.Permissions @see SocketPermission @author Marianne Mueller @author Roland Schemers @serial exclude

      String hostname = localhost.getHostName();
      harness.check(!hostname.equals(localhost.getHostAddress()));
      byte[] hostaddr = localhost.getAddress();


      Permission[] checkConnect = new Permission[] {
  new SocketPermission(hostname, "resolve")};
      
      TestSecurityManager sm = new TestSecurityManager(harness);
      try {
  sm.install();

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      harness.check(!list.isEmpty());


      Permission[] checks = new Permission[list.size()];
      for (int i = 0; i < list.size(); i++) {
  InetAddress addr = (InetAddress) list.get(i);
  checks[i] = new SocketPermission(addr.getHostAddress(), "resolve");
      }


      TestSecurityManager sm = new TestSecurityManager(harness);
      try {
  sm.install();

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          String host = getCodeBase().getHost();


              if (host != null && (host.length() > 0)) {
                // add permission for downloaded jars to access host they were from
                perms.add(new SocketPermission(host, "connect,accept"));
              }
              else if ( "file".equals(codesource.getLocation().getProtocol()) ) {
                // if running locally add file permission
                String path = codesource.getLocation().getFile().replace('/', File.separatorChar);
                  perms.add(new FilePermission(path, "read"));

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         *    action if isHttp flag is set.
         */
        String host = null;
        InetAddress inetAddress = InetAddress.getLocalHost();
        host = inetAddress.getHostName();
        socketPermission = new SocketPermission(host, "connect,accept,resolve");


        /*
         * 2) construct FilePermission object pointed to the qa1.jar file
         *    and construct FilePermission object pointed to
         *    the qa1-loader-pref.jar file  passing the 'read' action.

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  if (System.getSecurityManager() == null) {
      System.setSecurityManager(new SecurityManager());
  }


  AccessControlContext accA = createAccWith(new Permission[] {
      new SocketPermission(NAME, "connect"),
      new SocketPermission(NAME_U1, "connect"),
  });
  AccessControlContext accB = createAccWith(new Permission[] {
      new SocketPermission(ADDR1, "connect"),
      new SocketPermission(NAME_U2, "connect"),
  });
  AccessControlContext accC = createAccWith(new Permission[] {
      new SocketPermission(ADDR2, "connect"),
  });
  AccessControlContext accD = createAccWith(new Permission[] {
      new SocketPermission(NAME, "resolve"),
      new SocketPermission(ADDR2, "connect"),
  });


  int port = 2019;    // use separate ports to control reuse
  Ping impl = new PingImpl();  // hold on to impl

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            ((JarURLConnection) conn).getJarFileURL();
        conn = hostURL.openConnection();
          }
          String host = hostURL.getHost();
          if (host != null &&
        p.implies(new SocketPermission(host,
                     "resolve")))
          {
        Permission p2 =
            new SocketPermission(host,
               "connect,accept");
        if (!perms.implies(p2)) {
            perms.add(p2);
        }
          }

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        add(new RuntimePermission("queuePrintJob"));
        add(new RuntimePermission("getStackTrace"));
        add(new RuntimePermission("preferences"));
        
        //allow the scripts to connect via sockets
        add(new SocketPermission("*", "connect,accept"));
        
        //allow access to the server's file system. let the file perms 
        //guard what is writeable and what is not.
        add(new FilePermission("<<ALL FILES>>", "read,write,execute,delete"));

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                    // }
                    //
                    // let's cache it: 


                    if (this.sp == null) {
                        this.sp = new SocketPermission(thisHost, "resolve"); //$NON-NLS-1$
                    }


                    if (cs.sp == null) {
                        cs.sp = new SocketPermission(thatHost, "resolve"); //$NON-NLS-1$
                    }


                    if (!this.sp.implies(cs.sp)) {
                        return false;
                    }

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    public Permission getPermission() throws IOException {
        int port = url.getPort();
        if (port <= 0) {
            port = FTP_PORT;
        }
        return new SocketPermission(hostName + ":" + port, "connect, resolve");
    }

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    }


    @Override
    public Permission getPermission() throws IOException {
        return new SocketPermission(getHostName() + ":" + getHostPort(), "connect, resolve");
    }

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