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101 lines
4.4 KiB
ReStructuredText
101 lines
4.4 KiB
ReStructuredText
:tocdepth: 3
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base/protocols/conn/removal-hooks.zeek
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======================================
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.. zeek:namespace:: Conn
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Adds a framework for registering "connection removal hooks".
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All registered hooks for a given connection get run within the
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:zeek:see:`connection_state_remove` event for that connection.
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This functionality is useful from a performance/scaling concern:
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if every new protocol-analysis script uses
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:zeek:see:`connection_state_remove` to implement its finalization/cleanup
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logic, then all connections take the performance hit of dispatching that
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event, even if they aren't related to that specific protocol.
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:Namespace: Conn
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Summary
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~~~~~~~
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Types
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#####
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================================================= ===========================================================================
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:zeek:type:`Conn::RemovalHook`: :zeek:type:`hook` A hook function for use with either :zeek:see:`Conn::register_removal_hook`
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or :zeek:see:`Conn::unregister_removal_hook`.
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================================================= ===========================================================================
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Redefinitions
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#############
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============================================ =========================================================================================
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:zeek:type:`connection`: :zeek:type:`record`
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:New Fields: :zeek:type:`connection`
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removal_hooks: :zeek:type:`set` [:zeek:type:`Conn::RemovalHook`] :zeek:attr:`&optional`
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============================================ =========================================================================================
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Functions
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#########
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=============================================================== =====================================================================
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:zeek:id:`Conn::register_removal_hook`: :zeek:type:`function` Register a hook that will later be called during a connection's
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:zeek:see:`connection_state_remove` event.
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:zeek:id:`Conn::unregister_removal_hook`: :zeek:type:`function` Unregister a hook that would have been called during a connection's
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:zeek:see:`connection_state_remove` event such that it will no longer
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be called.
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=============================================================== =====================================================================
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Detailed Interface
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~~~~~~~~~~~~~~~~~~
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Types
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#####
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.. zeek:type:: Conn::RemovalHook
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:source-code: base/protocols/conn/removal-hooks.zeek 17 17
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:Type: :zeek:type:`hook` (c: :zeek:type:`connection`) : :zeek:type:`bool`
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A hook function for use with either :zeek:see:`Conn::register_removal_hook`
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or :zeek:see:`Conn::unregister_removal_hook`. The :zeek:see:`connection`
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argument refers to the connection currently being removed within a
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:zeek:see:`connection_state_remove` event.
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Functions
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#########
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.. zeek:id:: Conn::register_removal_hook
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:source-code: base/protocols/conn/removal-hooks.zeek 47 60
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:Type: :zeek:type:`function` (c: :zeek:type:`connection`, hk: :zeek:type:`Conn::RemovalHook`) : :zeek:type:`bool`
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Register a hook that will later be called during a connection's
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:zeek:see:`connection_state_remove` event.
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:param c: The associated connection whose :zeek:see:`connection_state_remove`
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event should trigger a callback to *hk*.
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:param hk: The hook function to use as a callback.
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:returns: false if the provided hook was previously registered, else true.
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.. zeek:id:: Conn::unregister_removal_hook
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:source-code: base/protocols/conn/removal-hooks.zeek 62 72
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:Type: :zeek:type:`function` (c: :zeek:type:`connection`, hk: :zeek:type:`Conn::RemovalHook`) : :zeek:type:`bool`
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Unregister a hook that would have been called during a connection's
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:zeek:see:`connection_state_remove` event such that it will no longer
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be called.
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:param c: The associated connection whose :zeek:see:`connection_state_remove`
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event could have triggered a callback to *hk*.
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:param hk: The hook function that would have been used as a callback.
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:returns: true if the provided hook was previously registered, else false.
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