308 lines
9.2 KiB
C
308 lines
9.2 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr.h"
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#include "apr_dso.h"
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#include "apr_hash.h"
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#include "apr_errno.h"
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#include "apr_pools.h"
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#include "apr_strings.h"
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#define APR_WANT_MEMFUNC
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#include "apr_general.h"
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#include "apr_atomic.h"
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#include "apu_config.h"
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#include "apu.h"
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#include "apu_internal.h"
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#include "apu_version.h"
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#include "apr_dbm_private.h"
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#include "apu_select_dbm.h"
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#include "apr_dbm.h"
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#include "apr_dbm_private.h"
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/* ### note: the setting of DBM_VTABLE will go away once we have multiple
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### DBMs in here.
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### Well, that day is here. So, do we remove DBM_VTABLE and the old
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### API entirely? Oh, what to do. We need an APU_DEFAULT_DBM #define.
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### Sounds like a job for autoconf. */
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#if APU_USE_DB
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#define DBM_VTABLE apr_dbm_type_db
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#define DBM_NAME "db"
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#elif APU_USE_GDBM
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#define DBM_VTABLE apr_dbm_type_gdbm
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#define DBM_NAME "gdbm"
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#elif APU_USE_NDBM
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#define DBM_VTABLE apr_dbm_type_ndbm
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#define DBM_NAME "ndbm"
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#elif APU_USE_SDBM
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#define DBM_VTABLE apr_dbm_type_sdbm
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#define DBM_NAME "sdbm"
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#else /* Not in the USE_xDBM list above */
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#error a DBM implementation was not specified
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#endif
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#if APU_DSO_BUILD
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static apr_hash_t *drivers = NULL;
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static apr_uint32_t initialised = 0, in_init = 1;
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static apr_status_t dbm_term(void *ptr)
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{
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/* set drivers to NULL so init can work again */
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drivers = NULL;
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/* Everything else we need is handled by cleanups registered
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* when we created mutexes and loaded DSOs
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*/
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return APR_SUCCESS;
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}
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#endif /* APU_DSO_BUILD */
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static apr_status_t dbm_open_type(apr_dbm_type_t const* * vtable,
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const char *type,
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apr_pool_t *pool)
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{
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#if !APU_DSO_BUILD
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*vtable = NULL;
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if (!strcasecmp(type, "default")) *vtable = &DBM_VTABLE;
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#if APU_HAVE_DB
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else if (!strcasecmp(type, "db")) *vtable = &apr_dbm_type_db;
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#endif
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else if (*type && !strcasecmp(type + 1, "dbm")) {
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#if APU_HAVE_GDBM
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if (*type == 'G' || *type == 'g') *vtable = &apr_dbm_type_gdbm;
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#endif
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#if APU_HAVE_NDBM
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if (*type == 'N' || *type == 'n') *vtable = &apr_dbm_type_ndbm;
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#endif
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#if APU_HAVE_SDBM
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if (*type == 'S' || *type == 's') *vtable = &apr_dbm_type_sdbm;
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#endif
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/* avoid empty block */ ;
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}
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if (*vtable)
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return APR_SUCCESS;
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return APR_ENOTIMPL;
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#else /* APU_DSO_BUILD */
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char modname[32];
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char symname[34];
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apr_dso_handle_sym_t symbol;
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apr_status_t rv;
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int usertype = 0;
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if (!strcasecmp(type, "default")) type = DBM_NAME;
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else if (!strcasecmp(type, "db")) type = "db";
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else if (*type && !strcasecmp(type + 1, "dbm")) {
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if (*type == 'G' || *type == 'g') type = "gdbm";
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else if (*type == 'N' || *type == 'n') type = "ndbm";
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else if (*type == 'S' || *type == 's') type = "sdbm";
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}
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else usertype = 1;
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if (apr_atomic_inc32(&initialised)) {
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apr_atomic_set32(&initialised, 1); /* prevent wrap-around */
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while (apr_atomic_read32(&in_init)) /* wait until we get fully inited */
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;
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}
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else {
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apr_pool_t *parent;
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/* Top level pool scope, need process-scope lifetime */
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for (parent = apr_pool_parent_get(pool);
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parent && parent != pool;
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parent = apr_pool_parent_get(pool))
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pool = parent;
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/* deprecate in 2.0 - permit implicit initialization */
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apu_dso_init(pool);
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drivers = apr_hash_make(pool);
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apr_hash_set(drivers, "sdbm", APR_HASH_KEY_STRING, &apr_dbm_type_sdbm);
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apr_pool_cleanup_register(pool, NULL, dbm_term,
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apr_pool_cleanup_null);
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apr_atomic_dec32(&in_init);
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}
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rv = apu_dso_mutex_lock();
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if (rv) {
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*vtable = NULL;
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return rv;
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}
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*vtable = apr_hash_get(drivers, type, APR_HASH_KEY_STRING);
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if (*vtable) {
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apu_dso_mutex_unlock();
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return APR_SUCCESS;
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}
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/* The driver DSO must have exactly the same lifetime as the
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* drivers hash table; ignore the passed-in pool */
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pool = apr_hash_pool_get(drivers);
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#if defined(NETWARE)
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apr_snprintf(modname, sizeof(modname), "dbm%s.nlm", type);
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#elif defined(WIN32) || defined (__CYGWIN__)
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apr_snprintf(modname, sizeof(modname),
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"apr_dbm_%s-" APU_STRINGIFY(APU_MAJOR_VERSION) ".dll", type);
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#else
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apr_snprintf(modname, sizeof(modname),
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"apr_dbm_%s-" APU_STRINGIFY(APU_MAJOR_VERSION) ".so", type);
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#endif
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apr_snprintf(symname, sizeof(symname), "apr_dbm_type_%s", type);
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rv = apu_dso_load(NULL, &symbol, modname, symname, pool);
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if (rv == APR_SUCCESS || rv == APR_EINIT) { /* previously loaded?!? */
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*vtable = symbol;
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if (usertype)
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type = apr_pstrdup(pool, type);
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apr_hash_set(drivers, type, APR_HASH_KEY_STRING, *vtable);
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rv = APR_SUCCESS;
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}
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else
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*vtable = NULL;
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apu_dso_mutex_unlock();
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return rv;
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#endif /* APU_DSO_BUILD */
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}
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APU_DECLARE(apr_status_t) apr_dbm_open_ex(apr_dbm_t **pdb, const char *type,
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const char *pathname,
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apr_int32_t mode,
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apr_fileperms_t perm,
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apr_pool_t *pool)
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{
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apr_dbm_type_t const* vtable = NULL;
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apr_status_t rv = dbm_open_type(&vtable, type, pool);
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if (rv == APR_SUCCESS) {
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rv = (vtable->open)(pdb, pathname, mode, perm, pool);
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}
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return rv;
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}
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APU_DECLARE(apr_status_t) apr_dbm_open(apr_dbm_t **pdb, const char *pathname,
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apr_int32_t mode, apr_fileperms_t perm,
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apr_pool_t *pool)
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{
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return apr_dbm_open_ex(pdb, DBM_NAME, pathname, mode, perm, pool);
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}
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APU_DECLARE(void) apr_dbm_close(apr_dbm_t *dbm)
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{
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(*dbm->type->close)(dbm);
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}
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APU_DECLARE(apr_status_t) apr_dbm_fetch(apr_dbm_t *dbm, apr_datum_t key,
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apr_datum_t *pvalue)
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{
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return (*dbm->type->fetch)(dbm, key, pvalue);
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}
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APU_DECLARE(apr_status_t) apr_dbm_store(apr_dbm_t *dbm, apr_datum_t key,
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apr_datum_t value)
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{
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return (*dbm->type->store)(dbm, key, value);
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}
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APU_DECLARE(apr_status_t) apr_dbm_delete(apr_dbm_t *dbm, apr_datum_t key)
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{
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return (*dbm->type->del)(dbm, key);
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}
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APU_DECLARE(int) apr_dbm_exists(apr_dbm_t *dbm, apr_datum_t key)
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{
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return (*dbm->type->exists)(dbm, key);
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}
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APU_DECLARE(apr_status_t) apr_dbm_firstkey(apr_dbm_t *dbm, apr_datum_t *pkey)
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{
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return (*dbm->type->firstkey)(dbm, pkey);
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}
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APU_DECLARE(apr_status_t) apr_dbm_nextkey(apr_dbm_t *dbm, apr_datum_t *pkey)
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{
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return (*dbm->type->nextkey)(dbm, pkey);
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}
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APU_DECLARE(void) apr_dbm_freedatum(apr_dbm_t *dbm, apr_datum_t data)
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{
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(*dbm->type->freedatum)(dbm, data);
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}
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APU_DECLARE(char *) apr_dbm_geterror(apr_dbm_t *dbm, int *errcode,
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char *errbuf, apr_size_t errbufsize)
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{
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if (errcode != NULL)
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*errcode = dbm->errcode;
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/* assert: errbufsize > 0 */
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if (dbm->errmsg == NULL)
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*errbuf = '\0';
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else
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(void) apr_cpystrn(errbuf, dbm->errmsg, errbufsize);
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return errbuf;
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}
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APU_DECLARE(apr_status_t) apr_dbm_get_usednames_ex(apr_pool_t *p,
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const char *type,
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const char *pathname,
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const char **used1,
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const char **used2)
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{
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apr_dbm_type_t const* vtable;
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apr_status_t rv = dbm_open_type(&vtable, type, p);
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if (rv == APR_SUCCESS) {
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(vtable->getusednames)(p, pathname, used1, used2);
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return APR_SUCCESS;
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}
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return rv;
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}
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APU_DECLARE(void) apr_dbm_get_usednames(apr_pool_t *p,
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const char *pathname,
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const char **used1,
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const char **used2)
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{
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apr_dbm_get_usednames_ex(p, DBM_NAME, pathname, used1, used2);
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}
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/* Most DBM libraries take a POSIX mode for creating files. Don't trust
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* the mode_t type, some platforms may not support it, int is safe.
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*/
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APU_DECLARE(int) apr_posix_perms2mode(apr_fileperms_t perm)
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{
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int mode = 0;
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mode |= 0700 & (perm >> 2); /* User is off-by-2 bits */
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mode |= 0070 & (perm >> 1); /* Group is off-by-1 bit */
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mode |= 0007 & (perm); /* World maps 1 for 1 */
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return mode;
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}
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