| java.lang.Object
 java.security.Permission
java.net.SocketPermission
| SocketPermission | | final public class SocketPermission extends Permission implements java.io.Serializable(Code) | | 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 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 Also: java.security.Permissions
See Also: SocketPermission
version:
1.41 10/27/00
author:
Marianne Mueller
author:
Roland Schemers |
| Constructor Summary | |
| public | SocketPermission(String host, String action)
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)). | | | SocketPermission(String host, int mask)
|
| Method Summary | |
| public boolean | equals(Object obj)
Checks two SocketPermission objects for equality. | | public String | getActions()
Returns the canonical string representation of the actions.
Always returns present actions in the following order:
connect, listen, accept, resolve. | | void | getCanonName()
| | void | getIP()
get IP addresses. | | int | getMask()
Return the current action mask. | | public int | hashCode()
Returns the hash code value for this object. | | public boolean | implies(Permission p)
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.
| | boolean | impliesIgnoreMask(SocketPermission 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.
Parameters:
p - the incoming permission request true if "permission" is a proper subset of the current object,false if not. | | public PermissionCollection | newPermissionCollection()
Returns a new PermissionCollection object for storing SocketPermission
objects. |
| SocketPermission | | public SocketPermission(String host, String action)(Code) | | 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");
Parameters:
host - the hostname or IPaddress of the computer, optionallyincluding a colon followed by a port or port range.
Parameters:
action - the action string. |
| SocketPermission | | SocketPermission(String host, int mask)(Code) | | |
| equals | | public boolean equals(Object obj)(Code) | | Checks two SocketPermission objects for equality.
Parameters:
obj - the object to test for equality with this object. true if obj is a SocketPermission, and has thesame hostname, port range, and actions as thisSocketPermission object. However, port range will be ignoredin the comparison if obj only contains the action, 'resolve'. |
| getActions | | public String getActions()(Code) | | Returns the canonical string representation of the actions.
Always returns present actions in the following order:
connect, listen, accept, resolve.
the canonical string representation of the actions. |
| getMask | | int getMask()(Code) | | Return the current action mask.
the actions mask. |
| hashCode | | public int hashCode()(Code) | | Returns the hash code value for this object.
a hash code value for this object. |
| implies | | public boolean implies(Permission p)(Code) | | 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.
Parameters:
p - the permission to check against. true if the specified permission is implied by this object,false if not. |
| impliesIgnoreMask | | boolean impliesIgnoreMask(SocketPermission that)(Code) | | 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.
Parameters:
p - the incoming permission request true if "permission" is a proper subset of the current object,false if not. |
| newPermissionCollection | | public PermissionCollection newPermissionCollection()(Code) | | 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.
a new PermissionCollection object suitable for storing SocketPermissions. |
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