1238 lines
39 KiB
C
1238 lines
39 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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/*
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* Generic DAV lock implementation that a DAV provider can use.
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*/
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#include "apr.h"
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#include "apr_strings.h"
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#include "apr_file_io.h"
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#include "apr_uuid.h"
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#define APR_WANT_MEMFUNC
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#include "apr_want.h"
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#include "apr_version.h"
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#if !APR_VERSION_AT_LEAST(2,0,0)
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#include "apu_version.h"
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#endif
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#include "httpd.h"
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#include "http_log.h"
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#include "http_main.h" /* for ap_server_conf */
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#include "mod_dav.h"
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#include "locks.h"
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/* ---------------------------------------------------------------
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*
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* Lock database primitives
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*
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*/
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/*
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* LOCK DATABASES
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*
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* Lockdiscovery information is stored in the single lock database specified
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* by the DAVGenericLockDB directive. Information about this db is stored in
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* the per-dir configuration.
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*
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* KEY
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*
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* The database is keyed by a key_type unsigned char (DAV_TYPE_FNAME)
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* followed by full path.
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*
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* VALUE
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*
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* The value consists of a list of elements.
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* DIRECT LOCK: [char (DAV_LOCK_DIRECT),
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* char (dav_lock_scope),
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* char (dav_lock_type),
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* int depth,
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* time_t expires,
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* apr_uuid_t locktoken,
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* char[] owner,
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* char[] auth_user]
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*
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* INDIRECT LOCK: [char (DAV_LOCK_INDIRECT),
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* apr_uuid_t locktoken,
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* time_t expires,
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* int key_size,
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* char[] key]
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* The key is to the collection lock that resulted in this indirect lock
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*/
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#define DAV_TRUE 1
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#define DAV_FALSE 0
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#define DAV_CREATE_LIST 23
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#define DAV_APPEND_LIST 24
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/* Stored lock_discovery prefix */
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#define DAV_LOCK_DIRECT 1
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#define DAV_LOCK_INDIRECT 2
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#define DAV_TYPE_FNAME 11
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/* Use the opaquelock scheme for locktokens */
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struct dav_locktoken {
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apr_uuid_t uuid;
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};
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#define dav_compare_locktoken(plt1, plt2) \
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memcmp(&(plt1)->uuid, &(plt2)->uuid, sizeof((plt1)->uuid))
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/* #################################################################
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* ### keep these structures (internal) or move fully to dav_lock?
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*/
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/*
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* We need to reliably size the fixed-length portion of
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* dav_lock_discovery; best to separate it into another
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* struct for a convenient sizeof, unless we pack lock_discovery.
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*/
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typedef struct dav_lock_discovery_fixed
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{
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char scope;
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char type;
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int depth;
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time_t timeout;
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} dav_lock_discovery_fixed;
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typedef struct dav_lock_discovery
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{
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struct dav_lock_discovery_fixed f;
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dav_locktoken *locktoken;
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const char *owner; /* owner field from activelock */
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const char *auth_user; /* authenticated user who created the lock */
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struct dav_lock_discovery *next;
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} dav_lock_discovery;
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/* Indirect locks represent locks inherited from containing collections.
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* They reference the lock token for the collection the lock is
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* inherited from. A lock provider may also define a key to the
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* inherited lock, for fast datbase lookup. The key is opaque outside
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* the lock provider.
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*/
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typedef struct dav_lock_indirect
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{
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dav_locktoken *locktoken;
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apr_datum_t key;
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struct dav_lock_indirect *next;
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time_t timeout;
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} dav_lock_indirect;
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/* ################################################################# */
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/*
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* Stored direct lock info - full lock_discovery length:
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* prefix + Fixed length + lock token + 2 strings + 2 nulls (one for each
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* string)
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*/
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#define dav_size_direct(a) (1 + sizeof(dav_lock_discovery_fixed) \
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+ sizeof(apr_uuid_t) \
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+ ((a)->owner ? strlen((a)->owner) : 0) \
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+ ((a)->auth_user ? strlen((a)->auth_user) : 0) \
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+ 2)
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/* Stored indirect lock info - lock token and apr_datum_t */
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#define dav_size_indirect(a) (1 + sizeof(apr_uuid_t) \
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+ sizeof(time_t) \
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+ sizeof(int) + (a)->key.dsize)
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/*
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* The lockdb structure.
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*
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* The <db> field may be NULL, meaning one of two things:
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* 1) That we have not actually opened the underlying database (yet). The
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* <opened> field should be false.
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* 2) We opened it readonly and it wasn't present.
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*
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* The delayed opening (determined by <opened>) makes creating a lockdb
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* quick, while deferring the underlying I/O until it is actually required.
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*
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* We export the notion of a lockdb, but hide the details of it. Most
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* implementations will use a database of some kind, but it is certainly
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* possible that alternatives could be used.
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*/
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struct dav_lockdb_private
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{
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request_rec *r; /* for accessing the uuid state */
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apr_pool_t *pool; /* a pool to use */
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const char *lockdb_path; /* where is the lock database? */
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int opened; /* we opened the database */
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apr_dbm_t *db; /* if non-NULL, the lock database */
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};
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typedef struct
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{
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dav_lockdb pub;
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dav_lockdb_private priv;
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} dav_lockdb_combined;
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/*
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* The private part of the lock structure.
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*/
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struct dav_lock_private
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{
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apr_datum_t key; /* key into the lock database */
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};
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typedef struct
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{
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dav_lock pub;
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dav_lock_private priv;
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dav_locktoken token;
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} dav_lock_combined;
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/*
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* This must be forward-declared so the open_lockdb function can use it.
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*/
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extern const dav_hooks_locks dav_hooks_locks_generic;
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static dav_error * dav_generic_dbm_new_error(apr_dbm_t *db, apr_pool_t *p,
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apr_status_t status)
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{
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int errcode;
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const char *errstr;
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dav_error *err;
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char errbuf[200];
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if (status == APR_SUCCESS) {
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return NULL;
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}
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/* There might not be a <db> if we had problems creating it. */
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if (db == NULL) {
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errcode = 1;
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errstr = "Could not open property database.";
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}
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else {
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(void) apr_dbm_geterror(db, &errcode, errbuf, sizeof(errbuf));
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errstr = apr_pstrdup(p, errbuf);
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}
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err = dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, errcode, status, errstr);
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return err;
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}
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/* internal function for creating locks */
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static dav_lock *dav_generic_alloc_lock(dav_lockdb *lockdb, apr_datum_t key,
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const dav_locktoken *locktoken)
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{
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dav_lock_combined *comb;
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comb = apr_pcalloc(lockdb->info->pool, sizeof(*comb));
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comb->pub.rectype = DAV_LOCKREC_DIRECT;
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comb->pub.info = &comb->priv;
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comb->priv.key = key;
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if (locktoken == NULL) {
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comb->pub.locktoken = &comb->token;
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apr_uuid_get(&comb->token.uuid);
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}
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else {
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comb->pub.locktoken = locktoken;
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}
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return &comb->pub;
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}
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/*
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* dav_generic_parse_locktoken
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*
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* Parse an opaquelocktoken URI into a locktoken.
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*/
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static dav_error * dav_generic_parse_locktoken(apr_pool_t *p,
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const char *char_token,
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dav_locktoken **locktoken_p)
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{
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dav_locktoken *locktoken;
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if (ap_strstr_c(char_token, "opaquelocktoken:") != char_token) {
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return dav_new_error(p,
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HTTP_BAD_REQUEST, DAV_ERR_LOCK_UNK_STATE_TOKEN, 0,
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"The lock token uses an unknown State-token "
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"format and could not be parsed.");
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}
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char_token += 16;
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locktoken = apr_pcalloc(p, sizeof(*locktoken));
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if (apr_uuid_parse(&locktoken->uuid, char_token)) {
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return dav_new_error(p, HTTP_BAD_REQUEST, DAV_ERR_LOCK_PARSE_TOKEN, 0,
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"The opaquelocktoken has an incorrect format "
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"and could not be parsed.");
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}
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*locktoken_p = locktoken;
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return NULL;
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}
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/*
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* dav_generic_format_locktoken
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*
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* Generate the URI for a locktoken
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*/
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static const char *dav_generic_format_locktoken(apr_pool_t *p,
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const dav_locktoken *locktoken)
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{
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char buf[APR_UUID_FORMATTED_LENGTH + 1];
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apr_uuid_format(buf, &locktoken->uuid);
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return apr_pstrcat(p, "opaquelocktoken:", buf, NULL);
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}
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/*
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* dav_generic_compare_locktoken
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*
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* Determine whether two locktokens are the same
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*/
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static int dav_generic_compare_locktoken(const dav_locktoken *lt1,
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const dav_locktoken *lt2)
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{
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return dav_compare_locktoken(lt1, lt2);
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}
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/*
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* dav_generic_really_open_lockdb:
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*
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* If the database hasn't been opened yet, then open the thing.
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*/
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static dav_error * dav_generic_really_open_lockdb(dav_lockdb *lockdb)
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{
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#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
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const apr_dbm_driver_t *driver;
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const apu_err_t *er;
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#endif
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dav_error *err;
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apr_status_t status = APR_SUCCESS;
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if (lockdb->info->opened) {
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return NULL;
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}
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#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
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status = apr_dbm_get_driver(&driver, NULL, &er, lockdb->info->pool);
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if (status) {
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ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(10288)
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"mod_dav_lock: The DBM library '%s' could not be loaded: %s",
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er->reason, er->msg);
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return dav_new_error(lockdb->info->pool, HTTP_INTERNAL_SERVER_ERROR, 1,
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status, "Could not load library for property database.");
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}
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status = apr_dbm_open2(&lockdb->info->db, driver, lockdb->info->lockdb_path,
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lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
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APR_OS_DEFAULT, lockdb->info->pool);
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#else
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status = apr_dbm_open(&lockdb->info->db, lockdb->info->lockdb_path,
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lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
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APR_OS_DEFAULT, lockdb->info->pool);
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#endif
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if (status) {
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err = dav_generic_dbm_new_error(lockdb->info->db, lockdb->info->pool,
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status);
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return dav_push_error(lockdb->info->pool,
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HTTP_INTERNAL_SERVER_ERROR,
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DAV_ERR_LOCK_OPENDB,
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"Could not open the lock database.",
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err);
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}
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/* all right. it is opened now. */
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lockdb->info->opened = 1;
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return NULL;
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}
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/*
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* dav_generic_open_lockdb:
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*
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* "open" the lock database, as specified in the global server configuration.
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* If force is TRUE, then the database is opened now, rather than lazily.
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*
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* Note that only one can be open read/write.
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*/
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static dav_error * dav_generic_open_lockdb(request_rec *r, int ro, int force,
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dav_lockdb **lockdb)
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{
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dav_lockdb_combined *comb;
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comb = apr_pcalloc(r->pool, sizeof(*comb));
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comb->pub.hooks = &dav_hooks_locks_generic;
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comb->pub.ro = ro;
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comb->pub.info = &comb->priv;
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comb->priv.r = r;
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comb->priv.pool = r->pool;
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comb->priv.lockdb_path = dav_generic_get_lockdb_path(r);
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if (comb->priv.lockdb_path == NULL) {
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return dav_new_error(r->pool, HTTP_INTERNAL_SERVER_ERROR,
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DAV_ERR_LOCK_NO_DB, 0,
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"A lock database was not specified with the "
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"DAVGenericLockDB directive. One must be "
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"specified to use the locking functionality.");
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}
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/* done initializing. return it. */
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*lockdb = &comb->pub;
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if (force) {
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/* ### add a higher-level comment? */
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return dav_generic_really_open_lockdb(*lockdb);
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}
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return NULL;
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}
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/*
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* dav_generic_close_lockdb:
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*
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* Close it. Duh.
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*/
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static void dav_generic_close_lockdb(dav_lockdb *lockdb)
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{
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if (lockdb->info->db != NULL) {
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apr_dbm_close(lockdb->info->db);
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}
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lockdb->info->opened = 0;
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}
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/*
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* dav_generic_build_key
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*
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* Given a pathname, build a DAV_TYPE_FNAME lock database key.
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*/
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static apr_datum_t dav_generic_build_key(apr_pool_t *p,
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const dav_resource *resource)
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{
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apr_datum_t key;
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const char *pathname = resource->uri;
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/* ### does this allocation have a proper lifetime? need to check */
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/* ### can we use a buffer for this? */
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/* size is TYPE + pathname + null */
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key.dsize = strlen(pathname) + 2;
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key.dptr = apr_palloc(p, key.dsize);
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*key.dptr = DAV_TYPE_FNAME;
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memcpy(key.dptr + 1, pathname, key.dsize - 1);
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if (key.dptr[key.dsize - 2] == '/')
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key.dptr[--key.dsize - 1] = '\0';
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return key;
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}
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/*
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* dav_generic_lock_expired: return 1 (true) if the given timeout is in the
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* past or present (the lock has expired), or 0 (false) if in the future
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* (the lock has not yet expired).
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*/
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static int dav_generic_lock_expired(time_t expires)
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{
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return expires != DAV_TIMEOUT_INFINITE && time(NULL) >= expires;
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}
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/*
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* dav_generic_save_lock_record: Saves the lock information specified in the
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* direct and indirect lock lists about path into the lock database.
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* If direct and indirect == NULL, the key is removed.
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*/
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static dav_error * dav_generic_save_lock_record(dav_lockdb *lockdb,
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apr_datum_t key,
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dav_lock_discovery *direct,
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dav_lock_indirect *indirect)
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{
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dav_error *err;
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apr_status_t status;
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apr_datum_t val = { 0 };
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char *ptr;
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dav_lock_discovery *dp = direct;
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dav_lock_indirect *ip = indirect;
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#if DAV_DEBUG
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if (lockdb->ro) {
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return dav_new_error(lockdb->info->pool,
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HTTP_INTERNAL_SERVER_ERROR, 0, 0,
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"INTERNAL DESIGN ERROR: the lockdb was opened "
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"readonly, but an attempt to save locks was "
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"performed.");
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}
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#endif
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if ((err = dav_generic_really_open_lockdb(lockdb)) != NULL) {
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/* ### add a higher-level error? */
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return err;
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}
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/* If nothing to save, delete key */
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if (dp == NULL && ip == NULL) {
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/* don't fail if the key is not present */
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/* ### but what about other errors? */
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apr_dbm_delete(lockdb->info->db, key);
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return NULL;
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}
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while (dp) {
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val.dsize += dav_size_direct(dp);
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dp = dp->next;
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}
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while (ip) {
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val.dsize += dav_size_indirect(ip);
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ip = ip->next;
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}
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/* ### can this be apr_palloc() ? */
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/* ### hmmm.... investigate the use of a buffer here */
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ptr = val.dptr = apr_pcalloc(lockdb->info->pool, val.dsize);
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dp = direct;
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ip = indirect;
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while (dp) {
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/* Direct lock - lock_discovery struct follows */
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*ptr++ = DAV_LOCK_DIRECT;
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memcpy(ptr, dp, sizeof(dp->f)); /* Fixed portion of struct */
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ptr += sizeof(dp->f);
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memcpy(ptr, dp->locktoken, sizeof(*dp->locktoken));
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ptr += sizeof(*dp->locktoken);
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if (dp->owner == NULL) {
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*ptr++ = '\0';
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}
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else {
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memcpy(ptr, dp->owner, strlen(dp->owner) + 1);
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ptr += strlen(dp->owner) + 1;
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}
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if (dp->auth_user == NULL) {
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*ptr++ = '\0';
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|
}
|
|
else {
|
|
memcpy(ptr, dp->auth_user, strlen(dp->auth_user) + 1);
|
|
ptr += strlen(dp->auth_user) + 1;
|
|
}
|
|
|
|
dp = dp->next;
|
|
}
|
|
|
|
while (ip) {
|
|
/* Indirect lock prefix */
|
|
*ptr++ = DAV_LOCK_INDIRECT;
|
|
|
|
memcpy(ptr, ip->locktoken, sizeof(*ip->locktoken));
|
|
ptr += sizeof(*ip->locktoken);
|
|
|
|
memcpy(ptr, &ip->timeout, sizeof(ip->timeout));
|
|
ptr += sizeof(ip->timeout);
|
|
|
|
memcpy(ptr, &ip->key.dsize, sizeof(ip->key.dsize));
|
|
ptr += sizeof(ip->key.dsize);
|
|
|
|
memcpy(ptr, ip->key.dptr, ip->key.dsize);
|
|
ptr += ip->key.dsize;
|
|
|
|
ip = ip->next;
|
|
}
|
|
|
|
if ((status = apr_dbm_store(lockdb->info->db, key, val)) != APR_SUCCESS) {
|
|
/* ### more details? add an error_id? */
|
|
err = dav_generic_dbm_new_error(lockdb->info->db, lockdb->info->pool,
|
|
status);
|
|
return dav_push_error(lockdb->info->pool,
|
|
HTTP_INTERNAL_SERVER_ERROR,
|
|
DAV_ERR_LOCK_SAVE_LOCK,
|
|
"Could not save lock information.",
|
|
err);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* dav_load_lock_record: Reads lock information about key from lock db;
|
|
* creates linked lists of the direct and indirect locks.
|
|
*
|
|
* If add_method = DAV_APPEND_LIST, the result will be appended to the
|
|
* head of the direct and indirect lists supplied.
|
|
*
|
|
* Passive lock removal: If lock has timed out, it will not be returned.
|
|
* ### How much "logging" does RFC 2518 require?
|
|
*/
|
|
static dav_error * dav_generic_load_lock_record(dav_lockdb *lockdb,
|
|
apr_datum_t key,
|
|
int add_method,
|
|
dav_lock_discovery **direct,
|
|
dav_lock_indirect **indirect)
|
|
{
|
|
apr_pool_t *p = lockdb->info->pool;
|
|
dav_error *err;
|
|
apr_status_t status;
|
|
apr_size_t offset = 0;
|
|
int need_save = DAV_FALSE;
|
|
apr_datum_t val = { 0 };
|
|
dav_lock_discovery *dp;
|
|
dav_lock_indirect *ip;
|
|
|
|
if (add_method != DAV_APPEND_LIST) {
|
|
*direct = NULL;
|
|
*indirect = NULL;
|
|
}
|
|
|
|
if ((err = dav_generic_really_open_lockdb(lockdb)) != NULL) {
|
|
/* ### add a higher-level error? */
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* If we opened readonly and the db wasn't there, then there are no
|
|
* locks for this resource. Just exit.
|
|
*/
|
|
if (lockdb->info->db == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if ((status = apr_dbm_fetch(lockdb->info->db, key, &val)) != APR_SUCCESS) {
|
|
return dav_generic_dbm_new_error(lockdb->info->db, p, status);
|
|
}
|
|
|
|
if (!val.dsize) {
|
|
return NULL;
|
|
}
|
|
|
|
while (offset < val.dsize) {
|
|
switch (*(val.dptr + offset++)) {
|
|
case DAV_LOCK_DIRECT:
|
|
/* Create and fill a dav_lock_discovery structure */
|
|
|
|
dp = apr_pcalloc(p, sizeof(*dp));
|
|
|
|
/* Copy the dav_lock_discovery_fixed portion */
|
|
memcpy(dp, val.dptr + offset, sizeof(dp->f));
|
|
offset += sizeof(dp->f);
|
|
|
|
/* Copy the lock token. */
|
|
dp->locktoken = apr_pmemdup(p, val.dptr + offset, sizeof(*dp->locktoken));
|
|
offset += sizeof(*dp->locktoken);
|
|
|
|
/* Do we have an owner field? */
|
|
if (*(val.dptr + offset) == '\0') {
|
|
++offset;
|
|
}
|
|
else {
|
|
apr_size_t len = strlen(val.dptr + offset);
|
|
dp->owner = apr_pstrmemdup(p, val.dptr + offset, len);
|
|
offset += len + 1;
|
|
}
|
|
|
|
if (*(val.dptr + offset) == '\0') {
|
|
++offset;
|
|
}
|
|
else {
|
|
apr_size_t len = strlen(val.dptr + offset);
|
|
dp->auth_user = apr_pstrmemdup(p, val.dptr + offset, len);
|
|
offset += len + 1;
|
|
}
|
|
|
|
if (!dav_generic_lock_expired(dp->f.timeout)) {
|
|
dp->next = *direct;
|
|
*direct = dp;
|
|
}
|
|
else {
|
|
need_save = DAV_TRUE;
|
|
}
|
|
break;
|
|
|
|
case DAV_LOCK_INDIRECT:
|
|
/* Create and fill a dav_lock_indirect structure */
|
|
|
|
ip = apr_pcalloc(p, sizeof(*ip));
|
|
ip->locktoken = apr_pmemdup(p, val.dptr + offset, sizeof(*ip->locktoken));
|
|
offset += sizeof(*ip->locktoken);
|
|
memcpy(&ip->timeout, val.dptr + offset, sizeof(ip->timeout));
|
|
offset += sizeof(ip->timeout);
|
|
/* length of datum */
|
|
ip->key.dsize = *((int *) (val.dptr + offset));
|
|
offset += sizeof(ip->key.dsize);
|
|
ip->key.dptr = apr_pmemdup(p, val.dptr + offset, ip->key.dsize);
|
|
offset += ip->key.dsize;
|
|
|
|
if (!dav_generic_lock_expired(ip->timeout)) {
|
|
ip->next = *indirect;
|
|
*indirect = ip;
|
|
}
|
|
else {
|
|
need_save = DAV_TRUE;
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
apr_dbm_freedatum(lockdb->info->db, val);
|
|
|
|
/* ### should use a computed_desc and insert corrupt token data */
|
|
--offset;
|
|
return dav_new_error(p,
|
|
HTTP_INTERNAL_SERVER_ERROR,
|
|
DAV_ERR_LOCK_CORRUPT_DB, 0,
|
|
apr_psprintf(p,
|
|
"The lock database was found to "
|
|
"be corrupt. offset %"
|
|
APR_SIZE_T_FMT ", c=%02x",
|
|
offset, val.dptr[offset]));
|
|
}
|
|
}
|
|
|
|
apr_dbm_freedatum(lockdb->info->db, val);
|
|
|
|
/* Clean up this record if we found expired locks */
|
|
/*
|
|
* ### shouldn't do this if we've been opened READONLY. elide the
|
|
* ### timed-out locks from the response, but don't save that info back
|
|
*/
|
|
if (need_save == DAV_TRUE) {
|
|
return dav_generic_save_lock_record(lockdb, key, *direct, *indirect);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* resolve <indirect>, returning <*direct> */
|
|
static dav_error * dav_generic_resolve(dav_lockdb *lockdb,
|
|
dav_lock_indirect *indirect,
|
|
dav_lock_discovery **direct,
|
|
dav_lock_discovery **ref_dp,
|
|
dav_lock_indirect **ref_ip)
|
|
{
|
|
dav_error *err;
|
|
dav_lock_discovery *dir;
|
|
dav_lock_indirect *ind;
|
|
|
|
if ((err = dav_generic_load_lock_record(lockdb, indirect->key,
|
|
DAV_CREATE_LIST,
|
|
&dir, &ind)) != NULL) {
|
|
/* ### insert a higher-level description? */
|
|
return err;
|
|
}
|
|
if (ref_dp != NULL) {
|
|
*ref_dp = dir;
|
|
*ref_ip = ind;
|
|
}
|
|
|
|
for (; dir != NULL; dir = dir->next) {
|
|
if (!dav_compare_locktoken(indirect->locktoken, dir->locktoken)) {
|
|
*direct = dir;
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* No match found (but we should have found one!) */
|
|
|
|
/* ### use a different description and/or error ID? */
|
|
return dav_new_error(lockdb->info->pool,
|
|
HTTP_INTERNAL_SERVER_ERROR,
|
|
DAV_ERR_LOCK_CORRUPT_DB, 0,
|
|
"The lock database was found to be corrupt. "
|
|
"An indirect lock's direct lock could not "
|
|
"be found.");
|
|
}
|
|
|
|
/* ---------------------------------------------------------------
|
|
*
|
|
* Property-related lock functions
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* dav_generic_get_supportedlock: Returns a static string for all
|
|
* supportedlock properties. I think we save more returning a static string
|
|
* than constructing it every time, though it might look cleaner.
|
|
*/
|
|
static const char *dav_generic_get_supportedlock(const dav_resource *resource)
|
|
{
|
|
static const char supported[] = DEBUG_CR
|
|
"<D:lockentry>" DEBUG_CR
|
|
"<D:lockscope><D:exclusive/></D:lockscope>" DEBUG_CR
|
|
"<D:locktype><D:write/></D:locktype>" DEBUG_CR
|
|
"</D:lockentry>" DEBUG_CR
|
|
"<D:lockentry>" DEBUG_CR
|
|
"<D:lockscope><D:shared/></D:lockscope>" DEBUG_CR
|
|
"<D:locktype><D:write/></D:locktype>" DEBUG_CR
|
|
"</D:lockentry>" DEBUG_CR;
|
|
|
|
return supported;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------
|
|
*
|
|
* General lock functions
|
|
*
|
|
*/
|
|
|
|
static dav_error * dav_generic_remove_locknull_state(dav_lockdb *lockdb,
|
|
const dav_resource *resource)
|
|
{
|
|
/* We don't need to do anything. */
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_create_lock(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
dav_lock **lock)
|
|
{
|
|
apr_datum_t key;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
|
|
*lock = dav_generic_alloc_lock(lockdb, key, NULL);
|
|
|
|
(*lock)->is_locknull = !resource->exists;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_get_locks(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
int calltype,
|
|
dav_lock **locks)
|
|
{
|
|
apr_pool_t *p = lockdb->info->pool;
|
|
apr_datum_t key;
|
|
dav_error *err;
|
|
dav_lock *lock = NULL;
|
|
dav_lock *newlock;
|
|
dav_lock_discovery *dp;
|
|
dav_lock_indirect *ip;
|
|
|
|
#if DAV_DEBUG
|
|
if (calltype == DAV_GETLOCKS_COMPLETE) {
|
|
return dav_new_error(lockdb->info->pool,
|
|
HTTP_INTERNAL_SERVER_ERROR, 0, 0,
|
|
"INTERNAL DESIGN ERROR: DAV_GETLOCKS_COMPLETE "
|
|
"is not yet supported");
|
|
}
|
|
#endif
|
|
|
|
key = dav_generic_build_key(p, resource);
|
|
if ((err = dav_generic_load_lock_record(lockdb, key, DAV_CREATE_LIST,
|
|
&dp, &ip)) != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
|
|
/* copy all direct locks to the result list */
|
|
for (; dp != NULL; dp = dp->next) {
|
|
newlock = dav_generic_alloc_lock(lockdb, key, dp->locktoken);
|
|
newlock->is_locknull = !resource->exists;
|
|
newlock->scope = dp->f.scope;
|
|
newlock->type = dp->f.type;
|
|
newlock->depth = dp->f.depth;
|
|
newlock->timeout = dp->f.timeout;
|
|
newlock->owner = dp->owner;
|
|
newlock->auth_user = dp->auth_user;
|
|
|
|
/* hook into the result list */
|
|
newlock->next = lock;
|
|
lock = newlock;
|
|
}
|
|
|
|
/* copy all the indirect locks to the result list. resolve as needed. */
|
|
for (; ip != NULL; ip = ip->next) {
|
|
newlock = dav_generic_alloc_lock(lockdb, ip->key, ip->locktoken);
|
|
newlock->is_locknull = !resource->exists;
|
|
|
|
if (calltype == DAV_GETLOCKS_RESOLVED) {
|
|
err = dav_generic_resolve(lockdb, ip, &dp, NULL, NULL);
|
|
if (err != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
|
|
newlock->scope = dp->f.scope;
|
|
newlock->type = dp->f.type;
|
|
newlock->depth = dp->f.depth;
|
|
newlock->timeout = dp->f.timeout;
|
|
newlock->owner = dp->owner;
|
|
newlock->auth_user = dp->auth_user;
|
|
}
|
|
else {
|
|
/* DAV_GETLOCKS_PARTIAL */
|
|
newlock->rectype = DAV_LOCKREC_INDIRECT_PARTIAL;
|
|
}
|
|
|
|
/* hook into the result list */
|
|
newlock->next = lock;
|
|
lock = newlock;
|
|
}
|
|
|
|
*locks = lock;
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_find_lock(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
const dav_locktoken *locktoken,
|
|
int partial_ok,
|
|
dav_lock **lock)
|
|
{
|
|
dav_error *err;
|
|
apr_datum_t key;
|
|
dav_lock_discovery *dp;
|
|
dav_lock_indirect *ip;
|
|
|
|
*lock = NULL;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
if ((err = dav_generic_load_lock_record(lockdb, key, DAV_CREATE_LIST,
|
|
&dp, &ip)) != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
|
|
for (; dp != NULL; dp = dp->next) {
|
|
if (!dav_compare_locktoken(locktoken, dp->locktoken)) {
|
|
*lock = dav_generic_alloc_lock(lockdb, key, locktoken);
|
|
(*lock)->is_locknull = !resource->exists;
|
|
(*lock)->scope = dp->f.scope;
|
|
(*lock)->type = dp->f.type;
|
|
(*lock)->depth = dp->f.depth;
|
|
(*lock)->timeout = dp->f.timeout;
|
|
(*lock)->owner = dp->owner;
|
|
(*lock)->auth_user = dp->auth_user;
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
for (; ip != NULL; ip = ip->next) {
|
|
if (!dav_compare_locktoken(locktoken, ip->locktoken)) {
|
|
*lock = dav_generic_alloc_lock(lockdb, ip->key, locktoken);
|
|
(*lock)->is_locknull = !resource->exists;
|
|
|
|
/* ### nobody uses the resolving right now! */
|
|
if (partial_ok) {
|
|
(*lock)->rectype = DAV_LOCKREC_INDIRECT_PARTIAL;
|
|
}
|
|
else {
|
|
(*lock)->rectype = DAV_LOCKREC_INDIRECT;
|
|
if ((err = dav_generic_resolve(lockdb, ip, &dp,
|
|
NULL, NULL)) != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
(*lock)->scope = dp->f.scope;
|
|
(*lock)->type = dp->f.type;
|
|
(*lock)->depth = dp->f.depth;
|
|
(*lock)->timeout = dp->f.timeout;
|
|
(*lock)->owner = dp->owner;
|
|
(*lock)->auth_user = dp->auth_user;
|
|
}
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_has_locks(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
int *locks_present)
|
|
{
|
|
dav_error *err;
|
|
apr_datum_t key;
|
|
|
|
*locks_present = 0;
|
|
|
|
if ((err = dav_generic_really_open_lockdb(lockdb)) != NULL) {
|
|
/* ### insert a higher-level error description */
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* If we opened readonly and the db wasn't there, then there are no
|
|
* locks for this resource. Just exit.
|
|
*/
|
|
if (lockdb->info->db == NULL)
|
|
return NULL;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
|
|
*locks_present = apr_dbm_exists(lockdb->info->db, key);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_append_locks(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
int make_indirect,
|
|
const dav_lock *lock)
|
|
{
|
|
apr_pool_t *p = lockdb->info->pool;
|
|
dav_error *err;
|
|
dav_lock_indirect *ip;
|
|
dav_lock_discovery *dp;
|
|
apr_datum_t key;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
|
|
err = dav_generic_load_lock_record(lockdb, key, 0, &dp, &ip);
|
|
if (err != NULL) {
|
|
/* ### maybe add in a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ### when we store the lock more directly, we need to update
|
|
* ### lock->rectype and lock->is_locknull
|
|
*/
|
|
|
|
if (make_indirect) {
|
|
for (; lock != NULL; lock = lock->next) {
|
|
|
|
/* ### this works for any <lock> rectype */
|
|
dav_lock_indirect *newi = apr_pcalloc(p, sizeof(*newi));
|
|
|
|
/* ### shut off the const warning for now */
|
|
newi->locktoken = (dav_locktoken *)lock->locktoken;
|
|
newi->timeout = lock->timeout;
|
|
newi->key = lock->info->key;
|
|
newi->next = ip;
|
|
ip = newi;
|
|
}
|
|
}
|
|
else {
|
|
for (; lock != NULL; lock = lock->next) {
|
|
/* create and link in the right kind of lock */
|
|
|
|
if (lock->rectype == DAV_LOCKREC_DIRECT) {
|
|
dav_lock_discovery *newd = apr_pcalloc(p, sizeof(*newd));
|
|
|
|
newd->f.scope = lock->scope;
|
|
newd->f.type = lock->type;
|
|
newd->f.depth = lock->depth;
|
|
newd->f.timeout = lock->timeout;
|
|
/* ### shut off the const warning for now */
|
|
newd->locktoken = (dav_locktoken *)lock->locktoken;
|
|
newd->owner = lock->owner;
|
|
newd->auth_user = lock->auth_user;
|
|
newd->next = dp;
|
|
dp = newd;
|
|
}
|
|
else {
|
|
/* DAV_LOCKREC_INDIRECT(_PARTIAL) */
|
|
|
|
dav_lock_indirect *newi = apr_pcalloc(p, sizeof(*newi));
|
|
|
|
/* ### shut off the const warning for now */
|
|
newi->locktoken = (dav_locktoken *)lock->locktoken;
|
|
newi->key = lock->info->key;
|
|
newi->next = ip;
|
|
ip = newi;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((err = dav_generic_save_lock_record(lockdb, key, dp, ip)) != NULL) {
|
|
/* ### maybe add a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static dav_error * dav_generic_remove_lock(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
const dav_locktoken *locktoken)
|
|
{
|
|
dav_error *err;
|
|
dav_lock_discovery *dh = NULL;
|
|
dav_lock_indirect *ih = NULL;
|
|
apr_datum_t key;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
|
|
if (locktoken != NULL) {
|
|
dav_lock_discovery *dp;
|
|
dav_lock_discovery *dprev = NULL;
|
|
dav_lock_indirect *ip;
|
|
dav_lock_indirect *iprev = NULL;
|
|
|
|
if ((err = dav_generic_load_lock_record(lockdb, key, DAV_CREATE_LIST,
|
|
&dh, &ih)) != NULL) {
|
|
/* ### maybe add a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
for (dp = dh; dp != NULL; dp = dp->next) {
|
|
if (dav_compare_locktoken(locktoken, dp->locktoken) == 0) {
|
|
if (dprev)
|
|
dprev->next = dp->next;
|
|
else
|
|
dh = dh->next;
|
|
}
|
|
dprev = dp;
|
|
}
|
|
|
|
for (ip = ih; ip != NULL; ip = ip->next) {
|
|
if (dav_compare_locktoken(locktoken, ip->locktoken) == 0) {
|
|
if (iprev)
|
|
iprev->next = ip->next;
|
|
else
|
|
ih = ih->next;
|
|
}
|
|
iprev = ip;
|
|
}
|
|
|
|
}
|
|
|
|
/* save the modified locks, or remove all locks (dh=ih=NULL). */
|
|
if ((err = dav_generic_save_lock_record(lockdb, key, dh, ih)) != NULL) {
|
|
/* ### maybe add a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int dav_generic_do_refresh(dav_lock_discovery *dp,
|
|
const dav_locktoken_list *ltl,
|
|
time_t new_time)
|
|
{
|
|
int dirty = 0;
|
|
|
|
for (; ltl != NULL; ltl = ltl->next) {
|
|
if (dav_compare_locktoken(dp->locktoken, ltl->locktoken) == 0)
|
|
{
|
|
dp->f.timeout = new_time;
|
|
dirty = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return dirty;
|
|
}
|
|
|
|
static dav_error * dav_generic_refresh_locks(dav_lockdb *lockdb,
|
|
const dav_resource *resource,
|
|
const dav_locktoken_list *ltl,
|
|
time_t new_time,
|
|
dav_lock **locks)
|
|
{
|
|
dav_error *err;
|
|
apr_datum_t key;
|
|
dav_lock_discovery *dp;
|
|
dav_lock_discovery *dp_scan;
|
|
dav_lock_indirect *ip;
|
|
int dirty = 0;
|
|
dav_lock *newlock;
|
|
|
|
*locks = NULL;
|
|
|
|
key = dav_generic_build_key(lockdb->info->pool, resource);
|
|
if ((err = dav_generic_load_lock_record(lockdb, key, DAV_CREATE_LIST,
|
|
&dp, &ip)) != NULL) {
|
|
/* ### maybe add in a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
/* ### we should be refreshing direct AND (resolved) indirect locks! */
|
|
|
|
/* refresh all of the direct locks on this resource */
|
|
for (dp_scan = dp; dp_scan != NULL; dp_scan = dp_scan->next) {
|
|
if (dav_generic_do_refresh(dp_scan, ltl, new_time)) {
|
|
/* the lock was refreshed. return the lock. */
|
|
newlock = dav_generic_alloc_lock(lockdb, key, dp_scan->locktoken);
|
|
newlock->is_locknull = !resource->exists;
|
|
newlock->scope = dp_scan->f.scope;
|
|
newlock->type = dp_scan->f.type;
|
|
newlock->depth = dp_scan->f.depth;
|
|
newlock->timeout = dp_scan->f.timeout;
|
|
newlock->owner = dp_scan->owner;
|
|
newlock->auth_user = dp_scan->auth_user;
|
|
|
|
newlock->next = *locks;
|
|
*locks = newlock;
|
|
|
|
dirty = 1;
|
|
}
|
|
}
|
|
|
|
/* if we refreshed any locks, then save them back. */
|
|
if (dirty
|
|
&& (err = dav_generic_save_lock_record(lockdb, key, dp, ip)) != NULL) {
|
|
/* ### maybe add in a higher-level description */
|
|
return err;
|
|
}
|
|
|
|
/* for each indirect lock, find its direct lock and refresh it. */
|
|
for (; ip != NULL; ip = ip->next) {
|
|
dav_lock_discovery *ref_dp;
|
|
dav_lock_indirect *ref_ip;
|
|
|
|
if ((err = dav_generic_resolve(lockdb, ip, &dp_scan,
|
|
&ref_dp, &ref_ip)) != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
if (dav_generic_do_refresh(dp_scan, ltl, new_time)) {
|
|
/* the lock was refreshed. return the lock. */
|
|
newlock = dav_generic_alloc_lock(lockdb, ip->key, dp->locktoken);
|
|
newlock->is_locknull = !resource->exists;
|
|
newlock->scope = dp->f.scope;
|
|
newlock->type = dp->f.type;
|
|
newlock->depth = dp->f.depth;
|
|
newlock->timeout = dp->f.timeout;
|
|
newlock->owner = dp->owner;
|
|
newlock->auth_user = dp_scan->auth_user;
|
|
|
|
newlock->next = *locks;
|
|
*locks = newlock;
|
|
|
|
/* save the (resolved) direct lock back */
|
|
if ((err = dav_generic_save_lock_record(lockdb, ip->key, ref_dp,
|
|
ref_ip)) != NULL) {
|
|
/* ### push a higher-level desc? */
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
const dav_hooks_locks dav_hooks_locks_generic =
|
|
{
|
|
dav_generic_get_supportedlock,
|
|
dav_generic_parse_locktoken,
|
|
dav_generic_format_locktoken,
|
|
dav_generic_compare_locktoken,
|
|
dav_generic_open_lockdb,
|
|
dav_generic_close_lockdb,
|
|
dav_generic_remove_locknull_state,
|
|
dav_generic_create_lock,
|
|
dav_generic_get_locks,
|
|
dav_generic_find_lock,
|
|
dav_generic_has_locks,
|
|
dav_generic_append_locks,
|
|
dav_generic_remove_lock,
|
|
dav_generic_refresh_locks,
|
|
NULL, /* lookup_resource */
|
|
|
|
NULL /* ctx */
|
|
};
|