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java.net
Class SocketPermission  

java.lang.Object
  java.security.Permission
      java.net.SocketPermission

All Implemented Interfaces:

java.security.Guard, java.io.Serializable

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public final class SocketPermission

extends java.security.Permission

implements java.io.Serializable

This class models a specific set of permssions for connecting to a host. There are two elements to this, the host/port combination and the permission list.

The host/port combination is specified as followed

 hostname[:[-]port[-[port]]]
 

The hostname portion can be either a hostname or IP address. If it is a hostname, a wildcard is allowed in hostnames. This wildcard is a "*" and matches one or more characters. Only one "*" may appear in the host and it must be the leftmost character. For example, "*.urbanophile.com" matches all hosts in the "urbanophile.com" domain.

The port portion can be either a single value, or a range of values treated as inclusive. The first or the last port value in the range can be omitted in which case either the minimum or maximum legal value for a port (respectively) is used by default. Here are some examples:

• 8080 - Represents port 8080 only
• 2000-3000 - Represents ports 2000 through 3000 inclusive
• -4000 - Represents ports 0 through 4000 inclusive
• 1024- - Represents ports 1024 through 65535 inclusive

The permission list is a comma separated list of individual permissions. These individual permissions are:

 accept
 connect
 listen
 resolve
 

The "listen" permission is only relevant if the host is localhost. If any permission at all is specified, then resolve permission is implied to exist.

Here are a variety of examples of how to create SocketPermission's

 SocketPermission("www.urbanophile.com", "connect");
   Can connect to any port on www.urbanophile.com
 SocketPermission("www.urbanophile.com:80", "connect,accept");
   Can connect to or accept connections from www.urbanophile.com on port 80
 SocketPermission("localhost:1024-", "listen,accept,connect");
   Can connect to, accept from, an listen on any local port number 1024
   and up.
 SocketPermission("*.edu", "connect");
   Can connect to any host in the edu domain
 SocketPermission("197.197.20.1", "accept");
   Can accept connections from 197.197.20.1
 

This class also supports IPv6 addresses. These should be specified in either RFC 2732 format or in full uncompressed form.

Since:

1.2

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Field Summary
private  java.lang.String	actions           A comma separated list of actions for which we have permission
private  java.lang.String	hostport           A hostname/port combination as described above
(package private) static long	serialVersionUID

 

Fields inherited from class java.security.Permission

 

Constructor Summary

SocketPermission(java.lang.String hostport, java.lang.String actions)           Initializes a new instance of SocketPermission with the specified host/port combination and actions string.

 

Method Summary
boolean	equals(java.lang.Object obj)           Tests this object for equality against another.
java.lang.String	getActions()           Returns the list of permission actions in this object in canonical order.
int	hashCode()           Returns a hash code value for this object.
boolean	implies(java.security.Permission perm)           Returns true if the permission object passed it is implied by the this permission.
java.security.PermissionCollection	newPermissionCollection()           Returns a new PermissionCollection object that can hold SocketPermission's.

 

Methods inherited from class java.security.Permission

checkGuard, getName, toString

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

serialVersionUID

static final long serialVersionUID

See Also:

Constant Field Values

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hostport

private transient java.lang.String hostport

A hostname/port combination as described above

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actions

private java.lang.String actions

A comma separated list of actions for which we have permission

Constructor Detail

SocketPermission

public SocketPermission(java.lang.String hostport,
                        java.lang.String actions)

Initializes a new instance of SocketPermission with the specified host/port combination and actions string.

Method Detail

equals

public boolean equals(java.lang.Object obj)

Tests this object for equality against another. This will be true if and only if the passed object is an instance of SocketPermission and both its hostname/port combination and permissions string are identical.

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hashCode

public int hashCode()

Returns a hash code value for this object. Overrides the Permission.hashCode().

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getActions

public java.lang.String getActions()

Returns the list of permission actions in this object in canonical order. The canonical order is "connect,listen,accept,resolve"

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newPermissionCollection

public java.security.PermissionCollection newPermissionCollection()

Returns a new PermissionCollection object that can hold SocketPermission's.

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implies

public boolean implies(java.security.Permission perm)

Returns true if the permission object passed it is implied by the this permission. This will be true if:

• The argument is of type SocketPermission
• The actions list of the argument are in this object's actions
• The port range of the argument is within this objects port range
• The hostname is equal to or a subset of this objects hostname

The argument's hostname will be a subset of this object's hostname if:

• The argument's hostname or IP address is equal to this object's.
• The argument's canonical hostname is equal to this object's.
• The argument's canonical name matches this domains hostname with wildcards

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