Class SocketPermission

java.lang.Object

java.security.Permission

java.net.SocketPermission

All Implemented Interfaces:

Serializable, Guard

@Deprecated(since="26",
            forRemoval=true)
public final class SocketPermission
extends Permission
implements Serializable

Deprecated, for removal: This API element is subject to removal in a future version.

This permission cannot be used for controlling access to resources as the Security Manager is no longer supported.

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 "*.example.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.

Since:

1.2

External Specifications

• RFC 2732: Format for Literal IPv6 Addresses in URL's

See Also:

• Permissions

Constructor Summary

Constructors

Constructor	Description
SocketPermission(String host, String action)	Deprecated, for removal: This API element is subject to removal in a future version. Creates a new SocketPermission object with the specified actions.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Deprecated, for removal: This API element is subject to removal in a future version. Checks two SocketPermission objects for equality.
String	getActions()	Deprecated, for removal: This API element is subject to removal in a future version. Returns the canonical string representation of the actions.
int	hashCode()	Deprecated, for removal: This API element is subject to removal in a future version. Returns the hash code value for this object.
boolean	implies(Permission p)	Deprecated, for removal: This API element is subject to removal in a future version. Checks if this socket permission object "implies" the specified permission.
PermissionCollection	newPermissionCollection()	Deprecated, for removal: This API element is subject to removal in a future version. Returns a new PermissionCollection object for storing SocketPermission objects.

Methods declared in class Permission

checkGuard, getName, toString

Modifier and Type	Method	Description
void	checkGuard(Object object)	Implements the guard interface for a permission.
final String	getName()	Returns the name of this Permission.
String	toString()	Returns a string describing this Permission.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Constructor Details

SocketPermission

public SocketPermission(String host,
 String action)

Deprecated, for removal: This API element is subject to removal in a future version.

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.example.com", "connect");
   nr = new SocketPermission("www.example.com:80", "connect");
   nr = new SocketPermission("*.example.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");

Parameters:

host - the hostname or IP address of the computer, optionally including a colon followed by a port or port range.

action - the action string.

Throws:

NullPointerException - if any parameters are null

IllegalArgumentException - if the format of host is invalid, or if the action string is empty, malformed, or contains an action other than the specified possible actions

Method Details

implies

public boolean implies(Permission p)

Deprecated, for removal: This API element is subject to removal in a future version.

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 *.example.com), and p's canonical name (the name without any preceding *) ends with this object's canonical host name. For example, *.example.com implies *.foo.example.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.

Specified by:

implies in class Permission

Parameters:

p - the permission to check against.

Returns:

true if the specified permission is implied by this object, false if not.

equals

public boolean equals(Object obj)

Deprecated, for removal: This API element is subject to removal in a future version.

Checks two SocketPermission objects for equality.

Specified by:

equals in class Permission

Parameters:

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'.

See Also:

• Object.hashCode()

hashCode

public int hashCode()

Deprecated, for removal: This API element is subject to removal in a future version.

Returns the hash code value for this object.

Specified by:

hashCode in class Permission

Returns:

a hash code value for this object.

See Also:

• Object.equals(Object)

getActions

public String getActions()

Deprecated, for removal: This API element is subject to removal in a future version.

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

Specified by:

getActions in class Permission

Returns:

the canonical string representation of the actions.

newPermissionCollection

public PermissionCollection newPermissionCollection()

Deprecated, for removal: This API element is subject to removal in a future version.

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.

Overrides:

newPermissionCollection in class Permission

Returns:

a new PermissionCollection object suitable for storing SocketPermissions.