Help-Site Computer Manuals
Software
Hardware
Programming
Networking
  Algorithms & Data Structures   Programming Languages   Revision Control
  Protocols
  Cameras   Computers   Displays   Keyboards & Mice   Motherboards   Networking   Printers & Scanners   Storage
  Windows   Linux & Unix   Mac

Net::ACL::Rule
Class representing a generic access-list/route-map entry

Net::ACL::Rule - Class representing a generic access-list/route-map entry



NAME

Net::ACL::Rule - Class representing a generic access-list/route-map entry


SYNOPSIS


    use Net::ACL::Rule qw( :action :rc );

    # Constructor

    $entry = new Net::ACL::Rule(

        Action  => ACL_PERMIT

        Match   => {

                IP      => '127.0.0.0/8'

                }

        Set     => {

                IP      => '127.0.0.1'

                },

        Seq     => 10

        );

    # Object Copy

    $clone = $entry->clone();

    # Accessor Methods

    $action = $entry->action($action);

    $action_str = $entry->action($action_str);

    $entry->add_match($matchrule);

    $entry->remove_match($matchrule);

    $entry->add_set($setrule);

    $entry->remove_set($setrule);

    $rc = $entry->match(@data);

    @data = $entry->set(@data);

    ($rc,@data) = $entry->query(@data);

    $subrule = $entry->autoconstruction($type,$class,$arg,@values);


DESCRIPTION

This module represents a single generic access-list and route-map entry. It is used by the Net::ACL object. It can match any data against a list of Net::ACL::Match objects, and if all are matched, it can have a list of Net::ACL::Set objects modify the data.


CONSTRUCTOR

new() - create a new Net::ACL::Rule object

    $entry = new Net::ACL::Rule(

        Action  => ACL_PERMIT

        Match   => {

                IP      => '127.0.0.0/8'

                }

        Set     => {

                IP      => '127.0.0.1'

                }

        );

This is the constructor for Net::ACL::Rule objects. It returns a reference to the newly created object. The following named parameters may be passed to the constructor.

Action
The action parameter could be either of the constants exported using ``action'' (See EXPORTS) or just a string matching permit or deny. ACL_PERMIT accepts the data, ACL_DENY drops the data, while ACL_CONTINUE is used to indicate that this entry might change the data, but does not decide whether the data should be accepted or droped.

Match
The match parameter can have multiple forms, and my exists zero, one or more times. The following forms are allowed:
Match object - A Net::ACL::Match object (or ancestor)
List - A list of Net::ACL::Match objects (or ancestors)
Hash - A hash reference. The constructor will for each key/value-pair call the autoconstructor() method and add the returned objects to the rule-set.
Set
The set parameter are in syntax just like the Match parameter, except it uses Net::ACL::Set objects.


OBJECT COPY

clone() - clone a Net::ACL::Rule object

    $clone = $entry->clone();

This method creates an exact copy of the Net::ACL::Rule object, with set, match and action attributes.


ACCESSOR METHODS

action()
This method returns the entry's action value. If called with an argument, the action value is changed to that argument.

action_str()
This method returns the entry's action string as either permit or deny. If called with an argument, the action value are changed to ACL_PERMIT if the argument matches /permit/i - otherwise ACL_DENY.

add_match()
remove_match()
add_set()
remove_set()
The methods add and remove match and set rules. Each argument should be a match or set rule object. New rules are added in the end of the rule set.

match()
The match method gets any arbitrary number of arguments. The arguments are passed to the match() method of each of the Net::ACL::Match objects, given at construction time - see new(). If all Match objects did match, the method returns ACL_MATCH. Otherwise ACL_MATCH.

set()
The set method gets any arbitrary number of arguments. The arguments are passed to the first of the Net::ACL::Set objects set() method. The result of this function is then used to call the next. This is repeated for all Set objects given at construction time - see new(). Finally the result of the last call is returned.

query()
The query method first attempt to match it's arguments with the match() method. If this fails, it returns ACL_CONTINUE. Otherwise it uses the set() method to potentially alter the arguments before they are returned with Action given on construction prefixed.

autoconstruction()
This method is used on construction to construct rules based on key/value-pairs in a Rule argument hash reference.

The first argument is the type (Match or Set). The second is the class name (see below). The third is the key name from the construction hash. The forth and any remaining arguments are used as parameters to the constructor.

The return value will be the result of:


        $class->new(@values);

The class is by the constructor set as Net::ACL::$type::$key

NOTE: Do to this; the keys of the hash are case-sensitive!

By replacing this function in a sub-class, it is possible to modify the class and/or key-value pairs and hence make more complex constructions from simple key-value pairs, or have more user-friendly key values (e.g. make them case-insensitive).


EXPORTS

The module exports the following symbols according to the rules and conventions of the Exporter module.

:rc

        ACL_MATCH, ACL_NOMATCH
:action

        ACL_PERMIT, ACL_DENY, ACL_CONTINUE


SEE ALSO

Net::ACL, Net::ACL::Set, Net::ACL::Match


AUTHOR

Martin Lorensen <bgp@martin.lorensen.dk>

Programminig
Wy
Wy
yW
Wy
Programming
Wy
Wy
Wy
Wy