2 * This is a data store backend for the Citadel server which uses Berkeley DB.
4 * Copyright (c) 1987-2019 by the citadel.org team
6 * This program is open source software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 3.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
15 /*****************************************************************************
16 Tunable configuration parameters for the Berkeley DB back end
17 *****************************************************************************/
19 /* Citadel will checkpoint the db at the end of every session, but only if
20 * the specified number of kilobytes has been written, or if the specified
21 * number of minutes has passed, since the last checkpoint.
23 #define MAX_CHECKPOINT_KBYTES 256
24 #define MAX_CHECKPOINT_MINUTES 15
26 /*****************************************************************************/
38 #error <db.h> was not found by configure. Install the Berkeley DB development package.
41 #if DB_VERSION_MAJOR < 5
42 #error Citadel requires Berkeley DB v5.0 or newer. Please upgrade.
45 #include <libcitadel.h>
47 #include "ctdl_module.h"
49 #include "citserver.h"
52 static DB *dbp[MAXCDB]; /* One DB handle for each Citadel database */
53 static DB_ENV *dbenv; /* The DB environment (global) */
58 syslog(LOG_DEBUG, "db: citserver is stopping in order to prevent data loss. uid=%d gid=%d euid=%d egid=%d",
59 getuid(), getgid(), geteuid(), getegid()
65 /* Verbose logging callback */
66 void cdb_verbose_log(const DB_ENV * dbenv, const char *msg)
68 if (!IsEmptyStr(msg)) {
69 syslog(LOG_DEBUG, "db: %s", msg);
74 /* Verbose logging callback */
75 void cdb_verbose_err(const DB_ENV * dbenv, const char *errpfx, const char *msg)
77 syslog(LOG_ERR, "db: %s", msg);
81 /* just a little helper function */
82 static void txabort(DB_TXN * tid)
86 ret = tid->abort(tid);
89 syslog(LOG_ERR, "db: txn_abort: %s", db_strerror(ret));
95 /* this one is even more helpful than the last. */
96 static void txcommit(DB_TXN * tid)
100 ret = tid->commit(tid, 0);
103 syslog(LOG_ERR, "db: txn_commit: %s", db_strerror(ret));
109 /* are you sensing a pattern yet? */
110 static void txbegin(DB_TXN ** tid)
114 ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
117 syslog(LOG_ERR, "db: txn_begin: %s", db_strerror(ret));
123 static void dbpanic(DB_ENV * env, int errval)
125 syslog(LOG_ERR, "db: PANIC: %s", db_strerror(errval));
129 static void cclose(DBC * cursor)
133 if ((ret = cursor->c_close(cursor))) {
134 syslog(LOG_ERR, "db: c_close: %s", db_strerror(ret));
140 static void bailIfCursor(DBC ** cursors, const char *msg)
144 for (i = 0; i < MAXCDB; i++)
145 if (cursors[i] != NULL) {
146 syslog(LOG_ERR, "db: cursor still in progress on cdb %02x: %s", i, msg);
152 void cdb_check_handles(void)
154 bailIfCursor(TSD->cursors, "in check_handles");
156 if (TSD->tid != NULL) {
157 syslog(LOG_ERR, "db: transaction still in progress!");
164 * Request a checkpoint of the database. Called once per minute by the thread manager.
166 void cdb_checkpoint(void)
170 syslog(LOG_DEBUG, "db: -- checkpoint --");
171 ret = dbenv->txn_checkpoint(dbenv, MAX_CHECKPOINT_KBYTES, MAX_CHECKPOINT_MINUTES, 0);
174 syslog(LOG_ERR, "db: cdb_checkpoint() txn_checkpoint: %s", db_strerror(ret));
178 /* After a successful checkpoint, we can cull the unused logs */
179 if (CtdlGetConfigInt("c_auto_cull")) {
180 ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 1);
183 ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 0);
189 * Open the various databases we'll be using. Any database which
190 * does not exist should be created. Note that we don't need a
191 * critical section here, because there aren't any active threads
192 * manipulating the database yet.
194 void open_databases(void)
200 int dbversion_major, dbversion_minor, dbversion_patch;
202 syslog(LOG_DEBUG, "db: open_databases() starting");
203 syslog(LOG_DEBUG, "db: Compiled libdb: %s", DB_VERSION_STRING);
204 syslog(LOG_DEBUG, "db: Linked libdb: %s", db_version(&dbversion_major, &dbversion_minor, &dbversion_patch));
205 syslog(LOG_DEBUG, "db: Linked zlib: %s", zlibVersion());
208 * Silently try to create the database subdirectory. If it's
209 * already there, no problem.
211 if ((mkdir(ctdl_data_dir, 0700) != 0) && (errno != EEXIST)) {
212 syslog(LOG_ERR, "db: unable to create database directory [%s]: %m", ctdl_data_dir);
214 if (chmod(ctdl_data_dir, 0700) != 0) {
215 syslog(LOG_ERR, "db: unable to set database directory accessrights [%s]: %m", ctdl_data_dir);
217 if (chown(ctdl_data_dir, CTDLUID, (-1)) != 0) {
218 syslog(LOG_ERR, "db: unable to set the owner for [%s]: %m", ctdl_data_dir);
220 syslog(LOG_DEBUG, "db: Setting up DB environment\n");
221 /* db_env_set_func_yield((int (*)(u_long, u_long))sched_yield); */
222 ret = db_env_create(&dbenv, 0);
224 syslog(LOG_ERR, "db: db_env_create: %s", db_strerror(ret));
225 syslog(LOG_ERR, "db: exit code %d", ret);
228 dbenv->set_errpfx(dbenv, "citserver");
229 dbenv->set_paniccall(dbenv, dbpanic);
230 dbenv->set_errcall(dbenv, cdb_verbose_err);
231 dbenv->set_errpfx(dbenv, "ctdl");
232 dbenv->set_msgcall(dbenv, cdb_verbose_log);
233 dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1);
234 dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1);
237 * We want to specify the shared memory buffer pool cachesize,
238 * but everything else is the default.
240 ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
242 syslog(LOG_ERR, "db: set_cachesize: %s", db_strerror(ret));
243 dbenv->close(dbenv, 0);
244 syslog(LOG_ERR, "db: exit code %d", ret);
248 if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
249 syslog(LOG_ERR, "db: set_lk_detect: %s", db_strerror(ret));
250 dbenv->close(dbenv, 0);
251 syslog(LOG_ERR, "db: exit code %d", ret);
255 flags = DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_INIT_TXN | DB_INIT_LOCK | DB_THREAD | DB_INIT_LOG;
256 syslog(LOG_DEBUG, "db: dbenv->open(dbenv, %s, %d, 0)", ctdl_data_dir, flags);
257 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
258 if (ret == DB_RUNRECOVERY) {
259 syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
260 syslog(LOG_ERR, "db: attempting recovery...");
262 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
264 if (ret == DB_RUNRECOVERY) {
265 syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
266 syslog(LOG_ERR, "db: attempting catastrophic recovery...");
267 flags &= ~DB_RECOVER;
268 flags |= DB_RECOVER_FATAL;
269 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
272 syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
273 dbenv->close(dbenv, 0);
274 syslog(LOG_ERR, "db: exit code %d", ret);
278 syslog(LOG_INFO, "db: mounting databases");
280 for (i = 0; i < MAXCDB; ++i) {
282 /* Create a database handle */
283 ret = db_create(&dbp[i], dbenv, 0);
285 syslog(LOG_ERR, "db: db_create: %s", db_strerror(ret));
286 syslog(LOG_ERR, "db: exit code %d", ret);
291 /* Arbitrary names for our tables -- we reference them by
292 * number, so we don't have string names for them.
294 snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i);
296 ret = dbp[i]->open(dbp[i], NULL, dbfilename, NULL, DB_BTREE, DB_CREATE | DB_AUTO_COMMIT | DB_THREAD, 0600);
298 syslog(LOG_ERR, "db: db_open[%02x]: %s", i, db_strerror(ret));
301 "db: You may need to tune your database; please read http://www.citadel.org/doku.php?id=faq:troubleshooting:out_of_lock_entries for more information.");
303 syslog(LOG_ERR, "db: exit code %d", ret);
311 /* Make sure we own all the files, because in a few milliseconds
312 * we're going to drop root privs.
314 void cdb_chmod_data(void)
318 char filename[PATH_MAX];
320 dp = opendir(ctdl_data_dir);
322 while (d = readdir(dp), d != NULL) {
323 if (d->d_name[0] != '.') {
324 snprintf(filename, sizeof filename, "%s/%s", ctdl_data_dir, d->d_name);
325 syslog(LOG_DEBUG, "db: chmod(%s, 0600) returned %d", filename, chmod(filename, 0600));
326 syslog(LOG_DEBUG, "db: chown(%s, CTDLUID, -1) returned %d",
327 filename, chown(filename, CTDLUID, (-1))
334 syslog(LOG_DEBUG, "db: open_databases() finished");
339 * Close all of the db database files we've opened. This can be done
340 * in a loop, since it's just a bunch of closes.
342 void close_databases(void)
347 syslog(LOG_INFO, "db: performing final checkpoint");
348 if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
349 syslog(LOG_ERR, "txn_checkpoint: %s", db_strerror(ret));
352 syslog(LOG_INFO, "db: flushing the database logs");
353 if ((ret = dbenv->log_flush(dbenv, NULL))) {
354 syslog(LOG_ERR, "db: log_flush: %s", db_strerror(ret));
357 /* print some statistics... */
359 dbenv->lock_stat_print(dbenv, DB_STAT_ALL);
362 /* close the tables */
363 for (a = 0; a < MAXCDB; ++a) {
364 syslog(LOG_INFO, "db: closing database %02x", a);
365 ret = dbp[a]->close(dbp[a], 0);
367 syslog(LOG_ERR, "db: db_close: %s", db_strerror(ret));
372 /* Close the handle. */
373 ret = dbenv->close(dbenv, 0);
375 syslog(LOG_EMERG, "db: DBENV->close: %s", db_strerror(ret));
381 * Decompress a database item if it was compressed on disk
383 void cdb_decompress_if_necessary(struct cdbdata *cdb)
385 static int magic = COMPRESS_MAGIC;
387 if ((cdb == NULL) || (cdb->ptr == NULL) || (cdb->len < sizeof(magic)) || (memcmp(cdb->ptr, &magic, sizeof(magic)))) {
391 /* At this point we know we're looking at a compressed item. */
393 struct CtdlCompressHeader zheader;
394 char *uncompressed_data;
395 char *compressed_data;
396 uLongf destLen, sourceLen;
399 memset(&zheader, 0, sizeof(struct CtdlCompressHeader));
400 cplen = sizeof(struct CtdlCompressHeader);
401 if (sizeof(struct CtdlCompressHeader) > cdb->len)
403 memcpy(&zheader, cdb->ptr, cplen);
405 compressed_data = cdb->ptr;
406 compressed_data += sizeof(struct CtdlCompressHeader);
408 sourceLen = (uLongf) zheader.compressed_len;
409 destLen = (uLongf) zheader.uncompressed_len;
410 uncompressed_data = malloc(zheader.uncompressed_len);
412 if (uncompress((Bytef *) uncompressed_data,
413 (uLongf *) & destLen, (const Bytef *) compressed_data, (uLong) sourceLen) != Z_OK) {
414 syslog(LOG_EMERG, "db: uncompress() error");
419 cdb->len = (size_t) destLen;
420 cdb->ptr = uncompressed_data;
425 * Store a piece of data. Returns 0 if the operation was successful. If a
426 * key already exists it should be overwritten.
428 int cdb_store(int cdb, const void *ckey, int ckeylen, void *cdata, int cdatalen)
435 struct CtdlCompressHeader zheader;
436 char *compressed_data = NULL;
438 size_t buffer_len = 0;
441 memset(&dkey, 0, sizeof(DBT));
442 memset(&ddata, 0, sizeof(DBT));
444 dkey.data = (void *) ckey;
445 ddata.size = cdatalen;
448 /* Only compress Visit and UseTable records. Everything else is uncompressed. */
449 if ((cdb == CDB_VISIT) || (cdb == CDB_USETABLE)) {
451 zheader.magic = COMPRESS_MAGIC;
452 zheader.uncompressed_len = cdatalen;
453 buffer_len = ((cdatalen * 101) / 100) + 100 + sizeof(struct CtdlCompressHeader);
454 destLen = (uLongf) buffer_len;
455 compressed_data = malloc(buffer_len);
456 if (compress2((Bytef *) (compressed_data + sizeof(struct CtdlCompressHeader)),
457 &destLen, (Bytef *) cdata, (uLongf) cdatalen, 1) != Z_OK) {
458 syslog(LOG_EMERG, "db: compress2() error");
461 zheader.compressed_len = (size_t) destLen;
462 memcpy(compressed_data, &zheader, sizeof(struct CtdlCompressHeader));
463 ddata.size = (size_t) (sizeof(struct CtdlCompressHeader) + zheader.compressed_len);
464 ddata.data = compressed_data;
467 if (TSD->tid != NULL) {
468 ret = dbp[cdb]->put(dbp[cdb], /* db */
469 TSD->tid, /* transaction ID */
475 syslog(LOG_EMERG, "db: cdb_store(%d): %s", cdb, db_strerror(ret));
479 free(compressed_data);
483 bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
488 if ((ret = dbp[cdb]->put(dbp[cdb], /* db */
489 tid, /* transaction ID */
493 if (ret == DB_LOCK_DEADLOCK) {
497 syslog(LOG_EMERG, "db: cdb_store(%d): %s", cdb, db_strerror(ret));
503 free(compressed_data);
513 * Delete a piece of data. Returns 0 if the operation was successful.
515 int cdb_delete(int cdb, void *key, int keylen)
522 memset(&dkey, 0, sizeof dkey);
526 if (TSD->tid != NULL) {
527 ret = dbp[cdb]->del(dbp[cdb], TSD->tid, &dkey, 0);
529 syslog(LOG_EMERG, "db: cdb_delete(%d): %s", cdb, db_strerror(ret));
530 if (ret != DB_NOTFOUND) {
535 bailIfCursor(TSD->cursors, "attempt to delete during r/o cursor");
540 if ((ret = dbp[cdb]->del(dbp[cdb], tid, &dkey, 0)) && ret != DB_NOTFOUND) {
541 if (ret == DB_LOCK_DEADLOCK) {
545 syslog(LOG_EMERG, "db: cdb_delete(%d): %s", cdb, db_strerror(ret));
556 static DBC *localcursor(int cdb)
561 if (TSD->cursors[cdb] == NULL) {
562 ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &curs, 0);
565 ret = TSD->cursors[cdb]->c_dup(TSD->cursors[cdb], &curs, DB_POSITION);
569 syslog(LOG_EMERG, "db: localcursor: %s", db_strerror(ret));
578 * Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
579 * a struct cdbdata which it is the caller's responsibility to free later on
580 * using the cdb_free() routine.
582 struct cdbdata *cdb_fetch(int cdb, const void *key, int keylen)
584 struct cdbdata *tempcdb;
588 memset(&dkey, 0, sizeof(DBT));
590 dkey.data = (void *) key;
592 if (TSD->tid != NULL) {
593 memset(&dret, 0, sizeof(DBT));
594 dret.flags = DB_DBT_MALLOC;
595 ret = dbp[cdb]->get(dbp[cdb], TSD->tid, &dkey, &dret, 0);
600 memset(&dret, 0, sizeof(DBT));
601 dret.flags = DB_DBT_MALLOC;
603 curs = localcursor(cdb);
605 ret = curs->c_get(curs, &dkey, &dret, DB_SET);
608 while (ret == DB_LOCK_DEADLOCK);
612 if ((ret != 0) && (ret != DB_NOTFOUND)) {
613 syslog(LOG_EMERG, "db: cdb_fetch(%d): %s", cdb, db_strerror(ret));
621 tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
623 if (tempcdb == NULL) {
624 syslog(LOG_EMERG, "db: cdb_fetch: Cannot allocate memory for tempcdb");
626 return NULL; /* make it easier for static analysis... */
628 tempcdb->len = dret.size;
629 tempcdb->ptr = dret.data;
630 cdb_decompress_if_necessary(tempcdb);
637 * Free a cdbdata item.
639 * Note that we only free the 'ptr' portion if it is not NULL. This allows
640 * other code to assume ownership of that memory simply by storing the
641 * pointer elsewhere and then setting 'ptr' to NULL. cdb_free() will then
644 void cdb_free(struct cdbdata *cdb)
653 void cdb_close_cursor(int cdb)
655 if (TSD->cursors[cdb] != NULL) {
656 cclose(TSD->cursors[cdb]);
659 TSD->cursors[cdb] = NULL;
664 * Prepare for a sequential search of an entire database.
665 * (There is guaranteed to be no more than one traversal in
666 * progress per thread at any given time.)
668 void cdb_rewind(int cdb)
672 if (TSD->cursors[cdb] != NULL) {
673 syslog(LOG_EMERG, "db: cdb_rewind: must close cursor on database %d before reopening", cdb);
675 /* cclose(TSD->cursors[cdb]); */
679 * Now initialize the cursor
681 ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &TSD->cursors[cdb], 0);
683 syslog(LOG_EMERG, "db: cdb_rewind: db_cursor: %s", db_strerror(ret));
690 * Fetch the next item in a sequential search. Returns a pointer to a
691 * cdbdata structure, or NULL if we've hit the end.
693 struct cdbdata *cdb_next_item(int cdb)
696 struct cdbdata *cdbret;
699 /* Initialize the key/data pair so the flags aren't set. */
700 memset(&key, 0, sizeof(key));
701 memset(&data, 0, sizeof(data));
702 data.flags = DB_DBT_MALLOC;
704 ret = TSD->cursors[cdb]->c_get(TSD->cursors[cdb], &key, &data, DB_NEXT);
707 if (ret != DB_NOTFOUND) {
708 syslog(LOG_EMERG, "db: cdb_next_item(%d): %s", cdb, db_strerror(ret));
711 cdb_close_cursor(cdb);
712 return NULL; /* presumably, end of file */
715 cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
716 cdbret->len = data.size;
717 cdbret->ptr = data.data;
718 cdb_decompress_if_necessary(cdbret);
725 * Transaction-based stuff. I'm writing this as I bake cookies...
727 void cdb_begin_transaction(void)
730 bailIfCursor(TSD->cursors, "can't begin transaction during r/o cursor");
732 if (TSD->tid != NULL) {
733 syslog(LOG_EMERG, "db: cdb_begin_transaction: ERROR: nested transaction");
741 void cdb_end_transaction(void)
745 for (i = 0; i < MAXCDB; i++)
746 if (TSD->cursors[i] != NULL) {
747 syslog(LOG_WARNING, "db: cdb_end_transaction: WARNING: cursor %d still open at transaction end", i);
748 cclose(TSD->cursors[i]);
749 TSD->cursors[i] = NULL;
752 if (TSD->tid == NULL) {
753 syslog(LOG_ERR, "db: cdb_end_transaction: ERROR: txcommit(NULL) !!");
764 * Truncate (delete every record)
766 void cdb_trunc(int cdb)
772 if (TSD->tid != NULL) {
773 syslog(LOG_EMERG, "db: cdb_trunc must not be called in a transaction.");
776 bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
781 if ((ret = dbp[cdb]->truncate(dbp[cdb], /* db */
782 NULL, /* transaction ID */
783 &count, /* #rows deleted */
785 if (ret == DB_LOCK_DEADLOCK) {
789 syslog(LOG_EMERG, "db: cdb_truncate(%d): %s", cdb, db_strerror(ret));
792 "db: You may need to tune your database; please read http://www.citadel.org/doku.php?id=faq:troubleshooting:out_of_lock_entries for more information.");
804 * compact (defragment) the database , possibly returning space back to the underlying filesystem
806 void cdb_compact(void)
811 syslog(LOG_DEBUG, "db: cdb_compact() started");
812 for (i = 0; i < MAXCDB; i++) {
813 syslog(LOG_DEBUG, "db: compacting database %d", i);
814 ret = dbp[i]->compact(dbp[i], NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
816 syslog(LOG_ERR, "db: compact: %s", db_strerror(ret));
819 syslog(LOG_DEBUG, "db: cdb_compact() finished");
823 // Has an item already been seen (is it in the CDB_USETABLE) ?
824 // Returns 0 if it hasn't, 1 if it has
825 // In either case, writes the item to the database for next time.
826 int CheckIfAlreadySeen(StrBuf *guid)
830 struct cdbdata *cdbut;
832 syslog(LOG_DEBUG, "db: CheckIfAlreadySeen(%s)", ChrPtr(guid));
833 cdbut = cdb_fetch(CDB_USETABLE, SKEY(guid));
839 /* (Re)write the record, to update the timestamp. Zeroing it out makes it compress better. */
840 memset(&ut, 0, sizeof(struct UseTable));
841 memcpy(ut.ut_msgid, SKEY(guid));
842 ut.ut_timestamp = time(NULL);
843 cdb_store(CDB_USETABLE, SKEY(guid), &ut, sizeof(struct UseTable));
848 void cmd_rsen(char *argbuf)
855 struct cdbdata *cdbut;
857 if (CtdlAccessCheck(ac_aide)) {
861 TLen = extract_token(Token, argbuf, 1, '|', sizeof Token);
862 if (strncmp(argbuf, "GET", 3) == 0) {
863 cdbut = cdb_fetch(CDB_USETABLE, Token, TLen);
865 memcpy(&ut, cdbut->ptr, ((cdbut->len > sizeof(struct UseTable)) ? sizeof(struct UseTable) : cdbut->len));
867 cprintf("%d %ld\n", CIT_OK, ut.ut_timestamp);
869 cprintf("%d not found\n", ERROR + NOT_HERE);
872 } else if (strncmp(argbuf, "SET", 3) == 0) {
873 memcpy(ut.ut_msgid, Token, TLen);
874 extract_token(Time, argbuf, 2, '|', sizeof Time);
875 ut.ut_timestamp = atol(Time);
876 cdb_store(CDB_USETABLE, Token, TLen, &ut, sizeof(struct UseTable));
877 cprintf("%d token updated\n", CIT_OK);
878 } else if (strncmp(argbuf, "DEL", 3) == 0) {
879 if (cdb_delete(CDB_USETABLE, Token, TLen))
880 cprintf("%d not found\n", ERROR + NOT_HERE);
882 cprintf("%d deleted.\n", CIT_OK);
885 cprintf("%d Usage: [GET|SET|DEL]|Token|timestamp\n", ERROR);
891 CTDL_MODULE_INIT(database)
894 CtdlRegisterProtoHook(cmd_rsen, "RSEN", "manipulate Aggregators seen database");
897 /* return our module id for the log */