Examples of java.net.SocketPermission

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 possible ways to connect to the host are
```
 accept connect listen resolve 
```
The "listen" action is only meaningful when used with "localhost". The "resolve" action is implied when any of the other actions are present. The action "resolve" refers to host/ip name service lookups.
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:
```
 p1 = new SocketPermission("puffin.eng.sun.com:7777", "connect,accept"); 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 @version 1.67 09/02/24 @author Marianne Mueller @author Roland Schemers @serial exclude


          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, SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION));
              }
              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, SecurityConstants.FILE_READ_ACTION));

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  }
  if (!host.startsWith("[") && host.indexOf(':') != -1) {
      host = "[" + host + "]";
  }
  if (port == -1) {
      checkPermission(new SocketPermission(host, 
    SecurityConstants.SOCKET_RESOLVE_ACTION));
  } else {
      checkPermission(new SocketPermission(host+":"+port,
    SecurityConstants.SOCKET_CONNECT_ACTION));
  }
    }

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  }
  if (!host.startsWith("[") && host.indexOf(':') != -1) {
      host = "[" + host + "]";
  }
  if (port == -1)
      checkPermission(new SocketPermission(host,
    SecurityConstants.SOCKET_RESOLVE_ACTION),
    context);
  else
      checkPermission(new SocketPermission(host+":"+port,
    SecurityConstants.SOCKET_CONNECT_ACTION),
    context);
    }

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     */
    public void checkListen(int port) {
  if (port == 0) {
      checkPermission(SecurityConstants.LOCAL_LISTEN_PERMISSION);
  } else {
      checkPermission(new SocketPermission("localhost:"+port,
    SecurityConstants.SOCKET_LISTEN_ACTION));
  }
    }

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      throw new NullPointerException("host can't be null");
  }
  if (!host.startsWith("[") && host.indexOf(':') != -1) {
      host = "[" + host + "]";
  }
  checkPermission(new SocketPermission(host+":"+port,
      SecurityConstants.SOCKET_ACCEPT_ACTION));
    }

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    public void checkMulticast(InetAddress maddr) {
  String host = maddr.getHostAddress();
  if (!host.startsWith("[") && host.indexOf(':') != -1) {
      host = "[" + host + "]";
  }
        checkPermission(new SocketPermission(host, 
      SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION));
    }

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    public void checkMulticast(InetAddress maddr, byte ttl) {
  String host = maddr.getHostAddress();
  if (!host.startsWith("[") && host.indexOf(':') != -1) {
      host = "[" + host + "]";
  }
        checkPermission(new SocketPermission(host, 
      SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION));
    }

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    } else if (!thisHost.equals(thatHost)) {
        if (thatHost == null) {
      return false;
        }
        if (this.sp == null) {
      this.sp = new SocketPermission(thisHost, "resolve");
        }
        if (that.sp == null) {
      that.sp = new SocketPermission(thatHost, "resolve");
        }
        if (!this.sp.implies(that.sp)) {
      return false;
        }
    }

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                .equals(perm));


        URL httpUrl = new URL("http://home/myfile/");
        assertTrue("Wrong http: permission", httpUrl.openConnection()
                .getPermission().equals(
                        new SocketPermission("home:80", "connect")));
        httpUrl = new URL("http://home2:8080/myfile/");
        assertTrue("Wrong http: permission", httpUrl.openConnection()
                .getPermission().equals(
                        new SocketPermission("home2:8080", "connect")));
        URL ftpUrl = new URL("ftp://home/myfile/");
        assertTrue("Wrong ftp: permission", ftpUrl.openConnection()
                .getPermission().equals(
                        new SocketPermission("home:21", "connect")));
        ftpUrl = new URL("ftp://home2:22/myfile/");
        assertTrue("Wrong ftp: permission", ftpUrl.openConnection()
                .getPermission().equals(
                        new SocketPermission("home2:22", "connect")));


        URL jarUrl = new URL("jar:file:myfile!/");
        perm = new FilePermission("myfile", "read");
        result = jarUrl.openConnection().getPermission();
        assertTrue("Wrong jar: permission:" + perm + " , " + result, result

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    }


    @Override
    public Permission getPermission() throws IOException {
        return new SocketPermission(getHostName() + ":" + getHostPort(), //$NON-NLS-1$
                "connect, resolve"); //$NON-NLS-1$
    }

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