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Diffstat (limited to 'modules/dav/lock/locks.c')
| -rw-r--r-- | modules/dav/lock/locks.c | 1237 |
1 files changed, 1237 insertions, 0 deletions
diff --git a/modules/dav/lock/locks.c b/modules/dav/lock/locks.c new file mode 100644 index 0000000..0f072ec --- /dev/null +++ b/modules/dav/lock/locks.c @@ -0,0 +1,1237 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * Generic DAV lock implementation that a DAV provider can use. + */ + +#include "apr.h" +#include "apr_strings.h" +#include "apr_file_io.h" +#include "apr_uuid.h" + +#define APR_WANT_MEMFUNC +#include "apr_want.h" + +#include "apr_version.h" +#if !APR_VERSION_AT_LEAST(2,0,0) +#include "apu_version.h" +#endif + +#include "httpd.h" +#include "http_log.h" +#include "http_main.h" /* for ap_server_conf */ + +#include "mod_dav.h" + +#include "locks.h" + + +/* --------------------------------------------------------------- + * + * Lock database primitives + * + */ + +/* + * LOCK DATABASES + * + * Lockdiscovery information is stored in the single lock database specified + * by the DAVGenericLockDB directive. Information about this db is stored in + * the per-dir configuration. + * + * KEY + * + * The database is keyed by a key_type unsigned char (DAV_TYPE_FNAME) + * followed by full path. + * + * VALUE + * + * The value consists of a list of elements. + * DIRECT LOCK: [char (DAV_LOCK_DIRECT), + * char (dav_lock_scope), + * char (dav_lock_type), + * int depth, + * time_t expires, + * apr_uuid_t locktoken, + * char[] owner, + * char[] auth_user] + * + * INDIRECT LOCK: [char (DAV_LOCK_INDIRECT), + * apr_uuid_t locktoken, + * time_t expires, + * int key_size, + * char[] key] + * The key is to the collection lock that resulted in this indirect lock + */ + +#define DAV_TRUE 1 +#define DAV_FALSE 0 + +#define DAV_CREATE_LIST 23 +#define DAV_APPEND_LIST 24 + +/* Stored lock_discovery prefix */ +#define DAV_LOCK_DIRECT 1 +#define DAV_LOCK_INDIRECT 2 + +#define DAV_TYPE_FNAME 11 + +/* Use the opaquelock scheme for locktokens */ +struct dav_locktoken { + apr_uuid_t uuid; +}; +#define dav_compare_locktoken(plt1, plt2) \ + memcmp(&(plt1)->uuid, &(plt2)->uuid, sizeof((plt1)->uuid)) + + +/* ################################################################# + * ### keep these structures (internal) or move fully to dav_lock? + */ + +/* + * We need to reliably size the fixed-length portion of + * dav_lock_discovery; best to separate it into another + * struct for a convenient sizeof, unless we pack lock_discovery. + */ +typedef struct dav_lock_discovery_fixed +{ + char scope; + char type; + int depth; + time_t timeout; +} dav_lock_discovery_fixed; + +typedef struct dav_lock_discovery +{ + struct dav_lock_discovery_fixed f; + + dav_locktoken *locktoken; + const char *owner; /* owner field from activelock */ + const char *auth_user; /* authenticated user who created the lock */ + struct dav_lock_discovery *next; +} dav_lock_discovery; + +/* Indirect locks represent locks inherited from containing collections. + * They reference the lock token for the collection the lock is + * inherited from. A lock provider may also define a key to the + * inherited lock, for fast datbase lookup. The key is opaque outside + * the lock provider. + */ +typedef struct dav_lock_indirect +{ + dav_locktoken *locktoken; + apr_datum_t key; + struct dav_lock_indirect *next; + time_t timeout; +} dav_lock_indirect; + +/* ################################################################# */ + +/* + * Stored direct lock info - full lock_discovery length: + * prefix + Fixed length + lock token + 2 strings + 2 nulls (one for each + * string) + */ +#define dav_size_direct(a) (1 + sizeof(dav_lock_discovery_fixed) \ + + sizeof(apr_uuid_t) \ + + ((a)->owner ? strlen((a)->owner) : 0) \ + + ((a)->auth_user ? strlen((a)->auth_user) : 0) \ + + 2) + +/* Stored indirect lock info - lock token and apr_datum_t */ +#define dav_size_indirect(a) (1 + sizeof(apr_uuid_t) \ + + sizeof(time_t) \ + + sizeof(int) + (a)->key.dsize) + +/* + * The lockdb structure. + * + * The <db> field may be NULL, meaning one of two things: + * 1) That we have not actually opened the underlying database (yet). The + * <opened> field should be false. + * 2) We opened it readonly and it wasn't present. + * + * The delayed opening (determined by <opened>) makes creating a lockdb + * quick, while deferring the underlying I/O until it is actually required. + * + * We export the notion of a lockdb, but hide the details of it. Most + * implementations will use a database of some kind, but it is certainly + * possible that alternatives could be used. + */ +struct dav_lockdb_private +{ + request_rec *r; /* for accessing the uuid state */ + apr_pool_t *pool; /* a pool to use */ + const char *lockdb_path; /* where is the lock database? */ + + int opened; /* we opened the database */ + apr_dbm_t *db; /* if non-NULL, the lock database */ +}; + +typedef struct +{ + dav_lockdb pub; + dav_lockdb_private priv; +} dav_lockdb_combined; + +/* + * The private part of the lock structure. + */ +struct dav_lock_private +{ + apr_datum_t key; /* key into the lock database */ +}; +typedef struct +{ + dav_lock pub; + dav_lock_private priv; + dav_locktoken token; +} dav_lock_combined; + +/* + * This must be forward-declared so the open_lockdb function can use it. + */ +extern const dav_hooks_locks dav_hooks_locks_generic; + +static dav_error * dav_generic_dbm_new_error(apr_dbm_t *db, apr_pool_t *p, + apr_status_t status) +{ + int errcode; + const char *errstr; + dav_error *err; + char errbuf[200]; + + if (status == APR_SUCCESS) { + return NULL; + } + + /* There might not be a <db> if we had problems creating it. */ + if (db == NULL) { + errcode = 1; + errstr = "Could not open property database."; + } + else { + (void) apr_dbm_geterror(db, &errcode, errbuf, sizeof(errbuf)); + errstr = apr_pstrdup(p, errbuf); + } + + err = dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, errcode, status, errstr); + return err; +} + +/* internal function for creating locks */ +static dav_lock *dav_generic_alloc_lock(dav_lockdb *lockdb, apr_datum_t key, + const dav_locktoken *locktoken) +{ + dav_lock_combined *comb; + + comb = apr_pcalloc(lockdb->info->pool, sizeof(*comb)); + comb->pub.rectype = DAV_LOCKREC_DIRECT; + comb->pub.info = &comb->priv; + comb->priv.key = key; + + if (locktoken == NULL) { + comb->pub.locktoken = &comb->token; + apr_uuid_get(&comb->token.uuid); + } + else { + comb->pub.locktoken = locktoken; + } + + return &comb->pub; +} + +/* + * dav_generic_parse_locktoken + * + * Parse an opaquelocktoken URI into a locktoken. + */ +static dav_error * dav_generic_parse_locktoken(apr_pool_t *p, + const char *char_token, + dav_locktoken **locktoken_p) +{ + dav_locktoken *locktoken; + + if (ap_strstr_c(char_token, "opaquelocktoken:") != char_token) { + return dav_new_error(p, + HTTP_BAD_REQUEST, DAV_ERR_LOCK_UNK_STATE_TOKEN, 0, + "The lock token uses an unknown State-token " + "format and could not be parsed."); + } + char_token += 16; + + locktoken = apr_pcalloc(p, sizeof(*locktoken)); + if (apr_uuid_parse(&locktoken->uuid, char_token)) { + return dav_new_error(p, HTTP_BAD_REQUEST, DAV_ERR_LOCK_PARSE_TOKEN, 0, + "The opaquelocktoken has an incorrect format " + "and could not be parsed."); + } + + *locktoken_p = locktoken; + return NULL; +} + +/* + * dav_generic_format_locktoken + * + * Generate the URI for a locktoken + */ +static const char *dav_generic_format_locktoken(apr_pool_t *p, + const dav_locktoken *locktoken) +{ + char buf[APR_UUID_FORMATTED_LENGTH + 1]; + + apr_uuid_format(buf, &locktoken->uuid); + return apr_pstrcat(p, "opaquelocktoken:", buf, NULL); +} + +/* + * dav_generic_compare_locktoken + * + * Determine whether two locktokens are the same + */ +static int dav_generic_compare_locktoken(const dav_locktoken *lt1, + const dav_locktoken *lt2) +{ + return dav_compare_locktoken(lt1, lt2); +} + +/* + * dav_generic_really_open_lockdb: + * + * If the database hasn't been opened yet, then open the thing. + */ +static dav_error * dav_generic_really_open_lockdb(dav_lockdb *lockdb) +{ +#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7) + const apr_dbm_driver_t *driver; + const apu_err_t *er; +#endif + dav_error *err; + apr_status_t status = APR_SUCCESS; + + if (lockdb->info->opened) { + return NULL; + } + +#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7) + status = apr_dbm_get_driver(&driver, NULL, &er, lockdb->info->pool); + + if (status) { + ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(10288) + "mod_dav_lock: The DBM library '%s' could not be loaded: %s", + er->reason, er->msg); + return dav_new_error(lockdb->info->pool, HTTP_INTERNAL_SERVER_ERROR, 1, + status, "Could not load library for property database."); + } + + status = apr_dbm_open2(&lockdb->info->db, driver, lockdb->info->lockdb_path, + lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE, + APR_OS_DEFAULT, lockdb->info->pool); +#else + status = apr_dbm_open(&lockdb->info->db, lockdb->info->lockdb_path, + lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE, + APR_OS_DEFAULT, lockdb->info->pool); +#endif + + if (status) { + 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_OPENDB, + "Could not open the lock database.", + err); + } + + /* all right. it is opened now. */ + lockdb->info->opened = 1; + + return NULL; +} + +/* + * dav_generic_open_lockdb: + * + * "open" the lock database, as specified in the global server configuration. + * If force is TRUE, then the database is opened now, rather than lazily. + * + * Note that only one can be open read/write. + */ +static dav_error * dav_generic_open_lockdb(request_rec *r, int ro, int force, + dav_lockdb **lockdb) +{ + dav_lockdb_combined *comb; + + comb = apr_pcalloc(r->pool, sizeof(*comb)); + comb->pub.hooks = &dav_hooks_locks_generic; + comb->pub.ro = ro; + comb->pub.info = &comb->priv; + comb->priv.r = r; + comb->priv.pool = r->pool; + + comb->priv.lockdb_path = dav_generic_get_lockdb_path(r); + if (comb->priv.lockdb_path == NULL) { + return dav_new_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, + DAV_ERR_LOCK_NO_DB, 0, + "A lock database was not specified with the " + "DAVGenericLockDB directive. One must be " + "specified to use the locking functionality."); + } + + /* done initializing. return it. */ + *lockdb = &comb->pub; + + if (force) { + /* ### add a higher-level comment? */ + return dav_generic_really_open_lockdb(*lockdb); + } + + return NULL; +} + +/* + * dav_generic_close_lockdb: + * + * Close it. Duh. + */ +static void dav_generic_close_lockdb(dav_lockdb *lockdb) +{ + if (lockdb->info->db != NULL) { + apr_dbm_close(lockdb->info->db); + } + lockdb->info->opened = 0; +} + +/* + * dav_generic_build_key + * + * Given a pathname, build a DAV_TYPE_FNAME lock database key. + */ +static apr_datum_t dav_generic_build_key(apr_pool_t *p, + const dav_resource *resource) +{ + apr_datum_t key; + const char *pathname = resource->uri; + + /* ### does this allocation have a proper lifetime? need to check */ + /* ### can we use a buffer for this? */ + + /* size is TYPE + pathname + null */ + key.dsize = strlen(pathname) + 2; + key.dptr = apr_palloc(p, key.dsize); + *key.dptr = DAV_TYPE_FNAME; + memcpy(key.dptr + 1, pathname, key.dsize - 1); + if (key.dptr[key.dsize - 2] == '/') + key.dptr[--key.dsize - 1] = '\0'; + return key; +} + +/* + * dav_generic_lock_expired: return 1 (true) if the given timeout is in the + * past or present (the lock has expired), or 0 (false) if in the future + * (the lock has not yet expired). + */ +static int dav_generic_lock_expired(time_t expires) +{ + return expires != DAV_TIMEOUT_INFINITE && time(NULL) >= expires; +} + +/* + * dav_generic_save_lock_record: Saves the lock information specified in the + * direct and indirect lock lists about path into the lock database. + * If direct and indirect == NULL, the key is removed. + */ +static dav_error * dav_generic_save_lock_record(dav_lockdb *lockdb, + apr_datum_t key, + dav_lock_discovery *direct, + dav_lock_indirect *indirect) +{ + dav_error *err; + apr_status_t status; + apr_datum_t val = { 0 }; + char *ptr; + dav_lock_discovery *dp = direct; + dav_lock_indirect *ip = indirect; + +#if DAV_DEBUG + if (lockdb->ro) { + return dav_new_error(lockdb->info->pool, + HTTP_INTERNAL_SERVER_ERROR, 0, 0, + "INTERNAL DESIGN ERROR: the lockdb was opened " + "readonly, but an attempt to save locks was " + "performed."); + } +#endif + + if ((err = dav_generic_really_open_lockdb(lockdb)) != NULL) { + /* ### add a higher-level error? */ + return err; + } + + /* If nothing to save, delete key */ + if (dp == NULL && ip == NULL) { + /* don't fail if the key is not present */ + /* ### but what about other errors? */ + apr_dbm_delete(lockdb->info->db, key); + return NULL; + } + + while (dp) { + val.dsize += dav_size_direct(dp); + dp = dp->next; + } + while (ip) { + val.dsize += dav_size_indirect(ip); + ip = ip->next; + } + + /* ### can this be apr_palloc() ? */ + /* ### hmmm.... investigate the use of a buffer here */ + ptr = val.dptr = apr_pcalloc(lockdb->info->pool, val.dsize); + dp = direct; + ip = indirect; + + while (dp) { + /* Direct lock - lock_discovery struct follows */ + *ptr++ = DAV_LOCK_DIRECT; + memcpy(ptr, dp, sizeof(dp->f)); /* Fixed portion of struct */ + ptr += sizeof(dp->f); + memcpy(ptr, dp->locktoken, sizeof(*dp->locktoken)); + ptr += sizeof(*dp->locktoken); + if (dp->owner == NULL) { + *ptr++ = '\0'; + } + else { + memcpy(ptr, dp->owner, strlen(dp->owner) + 1); + ptr += strlen(dp->owner) + 1; + } + if (dp->auth_user == NULL) { + *ptr++ = '\0'; + } + 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 */ +}; |