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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef DNS_DYNDB_H
#define DNS_DYNDB_H
#include <stdbool.h>
#include <isc/types.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
/*!
* \brief
* Context for initializing a dyndb module.
*
* This structure passes global server data to which a dyndb
* module will need access -- the server memory context, hash
* initializer, log context, etc. The structure doesn't persist
* beyond configuring the dyndb module. The module's register function
* should attach to all reference-counted variables and its destroy
* function should detach from them.
*/
struct dns_dyndbctx {
unsigned int magic;
const void *hashinit;
isc_mem_t *mctx;
isc_log_t *lctx;
dns_view_t *view;
dns_zonemgr_t *zmgr;
isc_task_t *task;
isc_timermgr_t *timermgr;
bool *refvar;
};
#define DNS_DYNDBCTX_MAGIC ISC_MAGIC('D', 'd', 'b', 'c')
#define DNS_DYNDBCTX_VALID(d) ISC_MAGIC_VALID(d, DNS_DYNDBCTX_MAGIC)
/*
* API version
*
* When the API changes, increment DNS_DYNDB_VERSION. If the
* change is backward-compatible (e.g., adding a new function call
* but not changing or removing an old one), increment DNS_DYNDB_AGE;
* if not, set DNS_DYNDB_AGE to 0.
*/
#ifndef DNS_DYNDB_VERSION
#define DNS_DYNDB_VERSION 1
#define DNS_DYNDB_AGE 0
#endif
typedef isc_result_t dns_dyndb_register_t(isc_mem_t *mctx,
const char *name,
const char *parameters,
const char *file,
unsigned long line,
const dns_dyndbctx_t *dctx,
void **instp);
/*%
* Called when registering a new driver instance. 'name' must be unique.
* 'parameters' contains the driver configuration text. 'dctx' is the
* initialization context set up in dns_dyndb_createctx().
*
* '*instp' must be set to the driver instance handle if the function
* is successful.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*\li Other errors are possible
*/
typedef void dns_dyndb_destroy_t(void **instp);
/*%
* Destroy a driver instance. Dereference any reference-counted
* variables passed in 'dctx' and 'inst' in the register function.
*
* \c *instp must be set to \c NULL by the function before it returns.
*/
typedef int dns_dyndb_version_t(unsigned int *flags);
/*%
* Return the API version number a dyndb module was compiled with.
*
* If the returned version number is no greater than than
* DNS_DYNDB_VERSION, and no less than DNS_DYNDB_VERSION - DNS_DYNDB_AGE,
* then the module is API-compatible with named.
*
* 'flags' is currently unused and may be NULL, but could be used in
* the future to pass back driver capabilities or other information.
*/
isc_result_t
dns_dyndb_load(const char *libname, const char *name, const char *parameters,
const char *file, unsigned long line, isc_mem_t *mctx,
const dns_dyndbctx_t *dctx);
/*%
* Load a dyndb module.
*
* This loads a dyndb module using dlopen() or equivalent, calls its register
* function (see dns_dyndb_register_t above), and if successful, adds
* the instance handle to a list of dyndb instances so it can be cleaned
* up later.
*
* 'file' and 'line' can be used to indicate the name of the file and
* the line number from which the parameters were taken, so that logged
* error messages, if any, will display the correct locations.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*\li Other errors are possible
*/
void
dns_dyndb_cleanup(bool exiting);
/*%
* Shut down and destroy all running dyndb modules.
*
* 'exiting' indicates whether the server is shutting down,
* as opposed to merely being reconfigured.
*/
isc_result_t
dns_dyndb_createctx(isc_mem_t *mctx, const void *hashinit, isc_log_t *lctx,
dns_view_t *view, dns_zonemgr_t *zmgr, isc_task_t *task,
isc_timermgr_t *tmgr, dns_dyndbctx_t **dctxp);
/*%
* Create a dyndb initialization context structure, with
* pointers to structures in the server that the dyndb module will
* need to access (view, zone manager, memory context, hash initializer,
* etc). This structure is expected to last only until all dyndb
* modules have been loaded and initialized; after that it will be
* destroyed with dns_dyndb_destroyctx().
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*\li Other errors are possible
*/
void
dns_dyndb_destroyctx(dns_dyndbctx_t **dctxp);
/*%
* Destroys a dyndb initialization context structure; all
* reference-counted members are detached and the structure is freed.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_DYNDB_H */
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