cachedb.h File Reference

This file contains a module that uses an external database to cache dns responses. More...

#include "util/module.h"

Data Structures
struct	cachedb_env
	The global variable environment contents for the cachedb Shared between threads, this represents long term information. More...
struct	cachedb_qstate
	Per query state for the cachedb module. More...
struct	cachedb_backend
	Backend call routines. More...

Macros
#define	CACHEDB_HASHSIZE   256 /* bit hash */

Functions
int	cachedb_init (struct module_env *env, int id)
	Init the cachedb module.
void	cachedb_deinit (struct module_env *env, int id)
	Deinit the cachedb module.
void	cachedb_operate (struct module_qstate *qstate, enum module_ev event, int id, struct outbound_entry *outbound)
	Operate on an event on a query (in qstate).
void	cachedb_inform_super (struct module_qstate *qstate, int id, struct module_qstate *super)
	Subordinate query done, inform this super request of its conclusion.
void	cachedb_clear (struct module_qstate *qstate, int id)
	clear the cachedb query-specific contents out of qstate
size_t	cachedb_get_mem (struct module_env *env, int id)
	return memory estimate for cachedb module
struct module_func_block *	cachedb_get_funcblock (void)
	Get the function block with pointers to the cachedb functions. More...
int	cachedb_is_enabled (struct module_stack *mods, struct module_env *env)
	See if the cachedb is enabled. More...
void	cachedb_msg_remove (struct module_qstate *qstate)
	Remove a message from the global cache. More...
void	cachedb_msg_remove_qinfo (struct module_env *env, struct query_info *qinfo)
	Remove message from the cachedb cache, by query info. More...

Detailed Description

This file contains a module that uses an external database to cache dns responses.

Function Documentation

cachedb_get_funcblock()

struct module_func_block* cachedb_get_funcblock

(

void

)

Get the function block with pointers to the cachedb functions.

Returns

the function block for "cachedb".

Referenced by module_funcs_avail().

cachedb_is_enabled()

int cachedb_is_enabled	(	struct module_stack *	mods,
		struct module_env *	env
	)

See if the cachedb is enabled.

Parameters

mods	module stack. It finds the cachedb module environment.
env	module environment.

Returns

true if exists and enabled.

cachedb_msg_remove()

void cachedb_msg_remove

(

struct module_qstate *

qstate

)

Remove a message from the global cache.

Because edns subnet has a more specific entry, and if not removed when everything expires, the global entry is used, instead of a fresh lookup of the edns subnet entry.

Parameters

qstate

query state.

cachedb_msg_remove_qinfo()

void cachedb_msg_remove_qinfo	(	struct module_env *	env,
		struct query_info *	qinfo
	)

Remove message from the cachedb cache, by query info.

Parameters

env	module environment to look up cachedb state.
qinfo	the message to remove.

Referenced by bogus_del_msg(), do_cache_remove(), negative_del_msg(), and zone_del_msg().