Commit f94f59d7 authored by Bob Halley's avatar Bob Halley
Browse files

add

parent a8dffb6b
/*
* Copyright (C) 1999 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#ifndef DNS_VIEW_H
#define DNS_VIEW_H 1
/*****
***** Module Info
*****/
/*
* DNS View
*
* XXX <TBS> XXX
*
* MP:
* The module ensures appropriate synchronization of data structures it
* creates and manipulates, with the exception that the caller is
* responsible for the safe creation and destruction of view managers.
*
* Reliability:
* No anticipated impact.
*
* Resources:
* <TBS>
*
* Security:
* No anticipated impact.
*
* Standards:
* None.
*/
#include <isc/types.h>
#include <isc/lang.h>
#include <isc/event.h>
#include <dns/types.h>
#include <dns/result.h>
ISC_LANG_BEGINDECLS
struct dns_view {
/* Unlocked. */
unsigned int magic;
isc_mem_t * mctx;
dns_rdataclass_t rdclass;
char * name;
dns_dbtable_t * dbtable;
dns_resolver_t * resolver;
isc_mutex_t lock;
/* Locked by lock. */
unsigned int references;
/* Under owner's locking control. */
ISC_LINK(struct dns_view) link;
};
#define DNS_VIEW_MAGIC 0x56696577 /* View. */
#define DNS_VIEW_VALID(view) ((view) != NULL && \
(view)->magic == DNS_VIEW_MAGIC)
isc_result_t
dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass, char *name,
dns_resolver_t *resolver, dns_view_t **viewp);
void
dns_view_attach(dns_view_t *source, dns_view_t **targetp);
void
dns_view_detach(dns_view_t **viewp);
ISC_LANG_ENDDECLS
#endif /* DNS_VIEW_H */
/*
* Copyright (C) 1999 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <config.h>
#include <string.h>
#include <isc/types.h>
#include <isc/result.h>
#include <isc/mem.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/rwlock.h>
#include <dns/types.h>
#include <dns/dbtable.h>
#include <dns/resolver.h>
#include <dns/view.h>
#include "../isc/util.h" /* XXXRTH */
isc_result_t
dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass, char *name,
dns_resolver_t *resolver, dns_view_t **viewp)
{
dns_view_t *view;
isc_result_t result;
/*
* Create a view.
*/
REQUIRE(name != NULL);
REQUIRE(viewp != NULL && *viewp == NULL);
view = isc_mem_get(mctx, sizeof *view);
if (view == NULL)
return (ISC_R_NOMEMORY);
view->name = isc_mem_strdup(mctx, name);
if (view->name == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup_view;
}
result = isc_mutex_init(&view->lock);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup_name;
}
view->dbtable = NULL;
result = dns_dbtable_create(mctx, rdclass, &view->dbtable);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"dns_dbtable_create() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup_mutex;
}
view->resolver = NULL;
if (resolver != NULL)
dns_resolver_attach(resolver, &view->resolver);
view->mctx = mctx;
view->rdclass = rdclass;
view->references = 1;
view->magic = DNS_VIEW_MAGIC;
*viewp = view;
return (ISC_R_SUCCESS);
cleanup_mutex:
isc_mutex_destroy(&view->lock);
cleanup_name:
isc_mem_free(mctx, view->name);
cleanup_view:
isc_mem_put(mctx, view, sizeof *view);
return (result);
}
void
dns_view_attach(dns_view_t *source, dns_view_t **targetp) {
REQUIRE(DNS_VIEW_VALID(source));
REQUIRE(targetp != NULL && *targetp == NULL);
LOCK(&source->lock);
INSIST(source->references > 0);
source->references++;
INSIST(source->references != 0);
UNLOCK(&source->lock);
*targetp = source;
}
static inline void
destroy(dns_view_t *view) {
REQUIRE(!ISC_LINK_LINKED(view, link));
if (view->resolver != NULL)
dns_resolver_detach(&view->resolver);
dns_dbtable_detach(&view->dbtable);
isc_mutex_destroy(&view->lock);
isc_mem_free(view->mctx, view->name);
isc_mem_put(view->mctx, view, sizeof *view);
}
void
dns_view_detach(dns_view_t **viewp) {
dns_view_t *view;
isc_boolean_t need_destroy = ISC_FALSE;
REQUIRE(viewp != NULL);
view = *viewp;
REQUIRE(DNS_VIEW_VALID(view));
LOCK(&view->lock);
INSIST(view->references > 0);
view->references--;
if (view->references == 0)
need_destroy = ISC_TRUE;
UNLOCK(&view->lock);
*viewp = NULL;
if (need_destroy)
destroy(view);
}
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