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738. [bug] If a non-threadsafe sdb driver supported AXFR and

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received an AXFR request, it would deadlock or die
                        with an assertion failure.
(also some other cleanups)
This commit is contained in:
Brian Wellington
2001-02-13 20:11:15 +00:00
parent b27b26d710
commit f24c135e09
2 changed files with 45 additions and 20 deletions
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4
CHANGES
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@@ -1,3 +1,7 @@
738. [bug] If a non-threadsafe sdb driver supported AXFR and
received an AXFR request, it would deadlock or die
with an assertion failure.
737. [port] stdtime failed to compile on certain platforms.
736. [func] New functions isc_task_{begin,end}exclusive().

61
lib/dns/sdb.c
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: sdb.c,v 1.25 2001/02/05 19:47:04 bwelling Exp $ */
/* $Id: sdb.c,v 1.26 2001/02/13 20:11:15 bwelling Exp $ */
#include <config.h>
@@ -62,6 +62,7 @@ struct dns_sdb {
dns_sdbimplementation_t *implementation;
void *dbdata;
isc_mutex_t lock;
isc_mutex_t driverlock;
/* Locked */
unsigned int references;
@@ -118,14 +119,14 @@ typedef struct sdb_rdatasetiter {
do { \
unsigned int flags = sdb->implementation->flags; \
if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \
LOCK(&sdb->lock); \
LOCK(&sdb->driverlock); \
} while (0)
#define MAYBE_UNLOCK(sdb) \
do { \
unsigned int flags = sdb->implementation->flags; \
if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \
UNLOCK(&sdb->lock); \
UNLOCK(&sdb->driverlock); \
} while (0)
static int dummy;
@@ -471,6 +472,7 @@ destroy(dns_sdb_t *sdb) {
isc_mem_free(mctx, sdb->zone);
DESTROYLOCK(&sdb->lock);
DESTROYLOCK(&sdb->driverlock);
sdb->common.magic = 0;
sdb->common.impmagic = 0;
@@ -581,7 +583,6 @@ createnode(dns_sdb_t *sdb, dns_sdbnode_t **nodep) {
node->name = NULL;
result = isc_mutex_init(&node->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(sdb->common.mctx, sdb, sizeof(dns_sdb_t));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
@@ -1172,39 +1173,45 @@ dns_sdb_create(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
result = isc_mutex_init(&sdb->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, sdb, sizeof(dns_sdb_t));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
isc_mem_detach(&sdb->common.mctx);
return (ISC_R_UNEXPECTED);
result = ISC_R_UNEXPECTED;
goto cleanup_mctx;
}
result = dns_name_dupwithoffsets(origin, mctx, &sdb->common.origin);
result = isc_mutex_init(&sdb->driverlock);
if (result != ISC_R_SUCCESS) {
destroy(sdb);
return (result);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup_lock;
}
result = dns_name_dupwithoffsets(origin, mctx, &sdb->common.origin);
if (result != ISC_R_SUCCESS)
goto cleanup_driverlock;
isc_buffer_init(&b, zonestr, sizeof(zonestr));
result = dns_name_totext(origin, ISC_TRUE, &b);
if (result != ISC_R_SUCCESS) {
destroy(sdb);
return (result);
}
if (result != ISC_R_SUCCESS)
goto cleanup_origin;
isc_buffer_putuint8(&b, 0);
sdb->zone = isc_mem_strdup(mctx, zonestr);
if (sdb->zone == NULL) {
destroy(sdb);
return (ISC_R_NOMEMORY);
result = ISC_R_NOMEMORY;
goto cleanup_origin;
}
sdb->dbdata = NULL;
if (imp->methods->create != NULL) {
result = imp->methods->create(sdb->zone, argc, argv,
imp->driverdata, &sdb->dbdata);
if (result != ISC_R_SUCCESS) {
destroy(sdb);
return (result);
}
if (result != ISC_R_SUCCESS)
goto cleanup_zonestr;
}
sdb->references = 1;
@@ -1215,6 +1222,20 @@ dns_sdb_create(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
*dbp = (dns_db_t *)sdb;
return (ISC_R_SUCCESS);
cleanup_zonestr:
isc_mem_free(mctx, sdb->zone);
cleanup_origin:
dns_name_free(&sdb->common.origin, mctx);
cleanup_driverlock:
isc_mutex_destroy(&sdb->driverlock);
cleanup_lock:
isc_mutex_destroy(&sdb->lock);
cleanup_mctx:
isc_mem_put(mctx, sdb, sizeof(dns_sdb_t));
isc_mem_detach(&mctx);
return (result);
}