+++ /dev/null
-/*
- * This is a data store backend for the Citadel server which uses Berkeley DB.
- *
- * Copyright (c) 1987-2012 by the citadel.org team
- *
- * This program is open source software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version 3.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-/*****************************************************************************
- Tunable configuration parameters for the Berkeley DB back end
- *****************************************************************************/
-
-/* Citadel will checkpoint the db at the end of every session, but only if
- * the specified number of kilobytes has been written, or if the specified
- * number of minutes has passed, since the last checkpoint.
- */
-#define MAX_CHECKPOINT_KBYTES 256
-#define MAX_CHECKPOINT_MINUTES 15
-
-/*****************************************************************************/
-
-#include "sysdep.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <string.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <syslog.h>
-#include <zlib.h>
-
-#ifdef HAVE_DB_H
-#include <db.h>
-#elif defined(HAVE_DB4_DB_H)
-#include <db4/db.h>
-#else
-#error Neither <db.h> nor <db4/db.h> was found by configure. Install db4-devel.
-#endif
-
-
-#if DB_VERSION_MAJOR < 4 || DB_VERSION_MINOR < 1
-#error Citadel requires Berkeley DB v4.1 or newer. Please upgrade.
-#endif
-
-
-#include <libcitadel.h>
-#include "citadel.h"
-#include "server.h"
-#include "citserver.h"
-#include "database.h"
-#include "msgbase.h"
-#include "sysdep_decls.h"
-#include "threads.h"
-#include "config.h"
-#include "control.h"
-
-#include "ctdl_module.h"
-
-
-static DB *dbp[MAXCDB]; /* One DB handle for each Citadel database */
-static DB_ENV *dbenv; /* The DB environment (global) */
-
-
-void cdb_abort(void) {
- syslog(LOG_DEBUG,
- "citserver is stopping in order to prevent data loss. uid=%d gid=%d euid=%d egid=%d",
- getuid(),
- getgid(),
- geteuid(),
- getegid()
- );
- cit_backtrace();
- exit(CTDLEXIT_DB);
-}
-
-
-/* Verbose logging callback */
-void cdb_verbose_log(const DB_ENV *dbenv, const char *msg)
-{
- if (!IsEmptyStr(msg)) {
- syslog(LOG_DEBUG, "DB: %s", msg);
- }
-}
-
-
-/* Verbose logging callback */
-void cdb_verbose_err(const DB_ENV *dbenv, const char *errpfx, const char *msg)
-{
- syslog(LOG_ALERT, "DB: %s", msg);
-}
-
-
-/* just a little helper function */
-static void txabort(DB_TXN * tid)
-{
- int ret;
-
- ret = tid->abort(tid);
-
- if (ret) {
- syslog(LOG_EMERG, "bdb(): txn_abort: %s", db_strerror(ret));
- cdb_abort();
- }
-}
-
-/* this one is even more helpful than the last. */
-static void txcommit(DB_TXN * tid)
-{
- int ret;
-
- ret = tid->commit(tid, 0);
-
- if (ret) {
- syslog(LOG_EMERG, "bdb(): txn_commit: %s", db_strerror(ret));
- cdb_abort();
- }
-}
-
-/* are you sensing a pattern yet? */
-static void txbegin(DB_TXN ** tid)
-{
- int ret;
-
- ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
-
- if (ret) {
- syslog(LOG_EMERG, "bdb(): txn_begin: %s", db_strerror(ret));
- cdb_abort();
- }
-}
-
-static void dbpanic(DB_ENV * env, int errval)
-{
- syslog(LOG_EMERG, "bdb(): PANIC: %s", db_strerror(errval));
-}
-
-static void cclose(DBC * cursor)
-{
- int ret;
-
- if ((ret = cursor->c_close(cursor))) {
- syslog(LOG_EMERG, "bdb(): c_close: %s", db_strerror(ret));
- cdb_abort();
- }
-}
-
-static void bailIfCursor(DBC ** cursors, const char *msg)
-{
- int i;
-
- for (i = 0; i < MAXCDB; i++)
- if (cursors[i] != NULL) {
- syslog(LOG_EMERG, "bdb(): cursor still in progress on cdb %02x: %s", i, msg);
- cdb_abort();
- }
-}
-
-
-void cdb_check_handles(void)
-{
- bailIfCursor(TSD->cursors, "in check_handles");
-
- if (TSD->tid != NULL) {
- syslog(LOG_EMERG, "bdb(): transaction still in progress!");
- cdb_abort();
- }
-}
-
-
-/*
- * Cull the database logs
- */
-static void cdb_cull_logs(void)
-{
- u_int32_t flags;
- int ret;
- char **file, **list;
- char errmsg[SIZ];
-
- flags = DB_ARCH_ABS;
-
- /* Get the list of names. */
- if ((ret = dbenv->log_archive(dbenv, &list, flags)) != 0) {
- syslog(LOG_ERR, "cdb_cull_logs: %s", db_strerror(ret));
- return;
- }
-
- /* Print the list of names. */
- if (list != NULL) {
- for (file = list; *file != NULL; ++file) {
- syslog(LOG_DEBUG, "Deleting log: %s", *file);
- ret = unlink(*file);
- if (ret != 0) {
- snprintf(errmsg, sizeof(errmsg),
- " ** ERROR **\n \n \n "
- "Citadel was unable to delete the "
- "database log file '%s' because of the "
- "following error:\n \n %s\n \n"
- " This log file is no longer in use "
- "and may be safely deleted.\n",
- *file, strerror(errno));
- CtdlAideMessage(errmsg, "Database Warning Message");
- }
- }
- free(list);
- }
-}
-
-/*
- * Manually initiate log file cull.
- */
-void cmd_cull(char *argbuf) {
- if (CtdlAccessCheck(ac_internal)) return;
- cdb_cull_logs();
- cprintf("%d Database log file cull completed.\n", CIT_OK);
-}
-
-
-/*
- * Request a checkpoint of the database. Called once per minute by the thread manager.
- */
-void cdb_checkpoint(void)
-{
- int ret;
-
- syslog(LOG_DEBUG, "-- db checkpoint --");
- ret = dbenv->txn_checkpoint(dbenv, MAX_CHECKPOINT_KBYTES, MAX_CHECKPOINT_MINUTES, 0);
-
- if (ret != 0) {
- syslog(LOG_EMERG, "cdb_checkpoint: txn_checkpoint: %s", db_strerror(ret));
- cdb_abort();
- }
-
- /* After a successful checkpoint, we can cull the unused logs */
- if (config.c_auto_cull) {
- cdb_cull_logs();
- }
-}
-
-
-
-/*
- * Open the various databases we'll be using. Any database which
- * does not exist should be created. Note that we don't need a
- * critical section here, because there aren't any active threads
- * manipulating the database yet.
- */
-void open_databases(void)
-{
- int ret;
- int i;
- char dbfilename[32];
- u_int32_t flags = 0;
- int dbversion_major, dbversion_minor, dbversion_patch;
- int current_dbversion = 0;
-
- syslog(LOG_DEBUG, "bdb(): open_databases() starting");
- syslog(LOG_DEBUG, "Compiled db: %s", DB_VERSION_STRING);
- syslog(LOG_INFO, " Linked db: %s",
- db_version(&dbversion_major, &dbversion_minor, &dbversion_patch));
-
- current_dbversion = (dbversion_major * 1000000) + (dbversion_minor * 1000) + dbversion_patch;
-
- syslog(LOG_DEBUG, "Calculated dbversion: %d", current_dbversion);
- syslog(LOG_DEBUG, " Previous dbversion: %d", CitControl.MMdbversion);
-
- if ( (getenv("SUPPRESS_DBVERSION_CHECK") == NULL)
- && (CitControl.MMdbversion > current_dbversion) ) {
- syslog(LOG_EMERG, "You are attempting to run the Citadel server using a version");
- syslog(LOG_EMERG, "of Berkeley DB that is older than that which last created or");
- syslog(LOG_EMERG, "updated the database. Because this would probably cause data");
- syslog(LOG_EMERG, "corruption or loss, the server is aborting execution now.");
- exit(CTDLEXIT_DB);
- }
-
- CitControl.MMdbversion = current_dbversion;
- put_control();
-
- syslog(LOG_INFO, "Linked zlib: %s\n", zlibVersion());
-
- /*
- * Silently try to create the database subdirectory. If it's
- * already there, no problem.
- */
- if ((mkdir(ctdl_data_dir, 0700) != 0) && (errno != EEXIST)){
- syslog(LOG_EMERG,
- "unable to create database directory [%s]: %s",
- ctdl_data_dir, strerror(errno));
- }
- if (chmod(ctdl_data_dir, 0700) != 0){
- syslog(LOG_EMERG,
- "unable to set database directory accessrights [%s]: %s",
- ctdl_data_dir, strerror(errno));
- }
- if (chown(ctdl_data_dir, CTDLUID, (-1)) != 0){
- syslog(LOG_EMERG,
- "unable to set the owner for [%s]: %s",
- ctdl_data_dir, strerror(errno));
- }
- syslog(LOG_DEBUG, "bdb(): Setting up DB environment\n");
- /* db_env_set_func_yield((int (*)(u_long, u_long))sched_yield); */
- ret = db_env_create(&dbenv, 0);
- if (ret) {
- syslog(LOG_EMERG, "bdb(): db_env_create: %s\n", db_strerror(ret));
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
- dbenv->set_errpfx(dbenv, "citserver");
- dbenv->set_paniccall(dbenv, dbpanic);
- dbenv->set_errcall(dbenv, cdb_verbose_err);
- dbenv->set_errpfx(dbenv, "ctdl");
-#if (DB_VERSION_MAJOR == 4) && (DB_VERSION_MINOR >= 3)
- dbenv->set_msgcall(dbenv, cdb_verbose_log);
-#endif
- dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1);
- dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1);
-
- /*
- * We want to specify the shared memory buffer pool cachesize,
- * but everything else is the default.
- */
- ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
- if (ret) {
- syslog(LOG_EMERG, "bdb(): set_cachesize: %s\n", db_strerror(ret));
- dbenv->close(dbenv, 0);
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
-
- if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
- syslog(LOG_EMERG, "bdb(): set_lk_detect: %s\n", db_strerror(ret));
- dbenv->close(dbenv, 0);
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
-
- flags = DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_INIT_TXN | DB_INIT_LOCK | DB_THREAD | DB_RECOVER;
- syslog(LOG_DEBUG, "dbenv->open(dbenv, %s, %d, 0)\n", ctdl_data_dir, flags);
- ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
- if (ret == DB_RUNRECOVERY) {
- syslog(LOG_ALERT, "dbenv->open: %s\n", db_strerror(ret));
- syslog(LOG_ALERT, "Attempting recovery...\n");
- flags |= DB_RECOVER;
- ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
- }
- if (ret == DB_RUNRECOVERY) {
- syslog(LOG_ALERT, "dbenv->open: %s\n", db_strerror(ret));
- syslog(LOG_ALERT, "Attempting catastrophic recovery...\n");
- flags &= ~DB_RECOVER;
- flags |= DB_RECOVER_FATAL;
- ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
- }
- if (ret) {
- syslog(LOG_EMERG, "dbenv->open: %s\n", db_strerror(ret));
- dbenv->close(dbenv, 0);
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
-
- syslog(LOG_INFO, "Starting up DB\n");
-
- for (i = 0; i < MAXCDB; ++i) {
-
- /* Create a database handle */
- ret = db_create(&dbp[i], dbenv, 0);
- if (ret) {
- syslog(LOG_EMERG, "db_create: %s\n", db_strerror(ret));
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
-
-
- /* Arbitrary names for our tables -- we reference them by
- * number, so we don't have string names for them.
- */
- snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i);
-
- ret = dbp[i]->open(dbp[i],
- NULL,
- dbfilename,
- NULL,
- DB_BTREE,
- DB_CREATE | DB_AUTO_COMMIT | DB_THREAD,
- 0600
- );
- if (ret) {
- syslog(LOG_EMERG, "db_open[%02x]: %s\n", i, db_strerror(ret));
- if (ret == ENOMEM) {
- syslog(LOG_EMERG, "You may need to tune your database; please read http://www.citadel.org/doku.php/faq:troubleshooting:out_of_lock_entries for more information.\n");
- }
- syslog(LOG_EMERG, "exit code %d\n", ret);
- exit(CTDLEXIT_DB);
- }
- }
-
-}
-
-
-/* Make sure we own all the files, because in a few milliseconds
- * we're going to drop root privs.
- */
-void cdb_chmod_data(void) {
- DIR *dp;
- struct dirent *d;
- char filename[PATH_MAX];
-
- dp = opendir(ctdl_data_dir);
- if (dp != NULL) {
- while (d = readdir(dp), d != NULL) {
- if (d->d_name[0] != '.') {
- snprintf(filename, sizeof filename,
- "%s/%s", ctdl_data_dir, d->d_name);
- syslog(LOG_DEBUG, "chmod(%s, 0600) returned %d\n",
- filename, chmod(filename, 0600)
- );
- syslog(LOG_DEBUG, "chown(%s, CTDLUID, -1) returned %d\n",
- filename, chown(filename, CTDLUID, (-1))
- );
- }
- }
- closedir(dp);
- }
-
- syslog(LOG_DEBUG, "open_databases() finished\n");
- CtdlRegisterProtoHook(cmd_cull, "CULL", "Cull database logs");
-}
-
-
-/*
- * Close all of the db database files we've opened. This can be done
- * in a loop, since it's just a bunch of closes.
- */
-void close_databases(void)
-{
- int a;
- int ret;
-
- if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
- syslog(LOG_EMERG,
- "txn_checkpoint: %s\n", db_strerror(ret));
- }
-
- /* print some statistics... */
-#ifdef DB_STAT_ALL
- dbenv->lock_stat_print(dbenv, DB_STAT_ALL);
-#endif
-
- /* close the tables */
- for (a = 0; a < MAXCDB; ++a) {
- syslog(LOG_INFO, "Closing database %02x\n", a);
- ret = dbp[a]->close(dbp[a], 0);
- if (ret) {
- syslog(LOG_EMERG, "db_close: %s\n", db_strerror(ret));
- }
-
- }
-
- /* Close the handle. */
- ret = dbenv->close(dbenv, 0);
- if (ret) {
- syslog(LOG_EMERG, "DBENV->close: %s\n", db_strerror(ret));
- }
-}
-
-
-/*
- * Decompress a database item if it was compressed on disk
- */
-void cdb_decompress_if_necessary(struct cdbdata *cdb)
-{
- static int magic = COMPRESS_MAGIC;
-
- if ((cdb == NULL) ||
- (cdb->ptr == NULL) ||
- (cdb->len < sizeof(magic)) ||
- (memcmp(cdb->ptr, &magic, sizeof(magic))))
- return;
-
- /* At this point we know we're looking at a compressed item. */
-
- struct CtdlCompressHeader zheader;
- char *uncompressed_data;
- char *compressed_data;
- uLongf destLen, sourceLen;
- size_t cplen;
-
- memset(&zheader, 0, sizeof(struct CtdlCompressHeader));
- cplen = sizeof(struct CtdlCompressHeader);
- if (sizeof(struct CtdlCompressHeader) > cdb->len)
- cplen = cdb->len;
- memcpy(&zheader, cdb->ptr, cplen);
-
- compressed_data = cdb->ptr;
- compressed_data += sizeof(struct CtdlCompressHeader);
-
- sourceLen = (uLongf) zheader.compressed_len;
- destLen = (uLongf) zheader.uncompressed_len;
- uncompressed_data = malloc(zheader.uncompressed_len);
-
- if (uncompress((Bytef *) uncompressed_data,
- (uLongf *) & destLen,
- (const Bytef *) compressed_data,
- (uLong) sourceLen) != Z_OK) {
- syslog(LOG_EMERG, "uncompress() error\n");
- cdb_abort();
- }
-
- free(cdb->ptr);
- cdb->len = (size_t) destLen;
- cdb->ptr = uncompressed_data;
-}
-
-
-
-/*
- * Store a piece of data. Returns 0 if the operation was successful. If a
- * key already exists it should be overwritten.
- */
-int cdb_store(int cdb, void *ckey, int ckeylen, void *cdata, int cdatalen)
-{
-
- DBT dkey, ddata;
- DB_TXN *tid;
- int ret = 0;
-
- struct CtdlCompressHeader zheader;
- char *compressed_data = NULL;
- int compressing = 0;
- size_t buffer_len = 0;
- uLongf destLen = 0;
-
- memset(&dkey, 0, sizeof(DBT));
- memset(&ddata, 0, sizeof(DBT));
- dkey.size = ckeylen;
- dkey.data = ckey;
- ddata.size = cdatalen;
- ddata.data = cdata;
-
- /* Only compress Visit records. Everything else is uncompressed. */
- if (cdb == CDB_VISIT) {
- compressing = 1;
- zheader.magic = COMPRESS_MAGIC;
- zheader.uncompressed_len = cdatalen;
- buffer_len = ((cdatalen * 101) / 100) + 100
- + sizeof(struct CtdlCompressHeader);
- destLen = (uLongf) buffer_len;
- compressed_data = malloc(buffer_len);
- if (compress2((Bytef *) (compressed_data + sizeof(struct CtdlCompressHeader)),
- &destLen, (Bytef *) cdata, (uLongf) cdatalen, 1) != Z_OK)
- {
- syslog(LOG_EMERG, "compress2() error\n");
- cdb_abort();
- }
- zheader.compressed_len = (size_t) destLen;
- memcpy(compressed_data, &zheader, sizeof(struct CtdlCompressHeader));
- ddata.size = (size_t) (sizeof(struct CtdlCompressHeader) + zheader.compressed_len);
- ddata.data = compressed_data;
- }
-
- if (TSD->tid != NULL) {
- ret = dbp[cdb]->put(dbp[cdb], /* db */
- TSD->tid, /* transaction ID */
- &dkey, /* key */
- &ddata, /* data */
- 0); /* flags */
- if (ret) {
- syslog(LOG_EMERG, "cdb_store(%d): %s", cdb, db_strerror(ret));
- cdb_abort();
- }
- if (compressing)
- free(compressed_data);
- return ret;
-
- } else {
- bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
-
- retry:
- txbegin(&tid);
-
- if ((ret = dbp[cdb]->put(dbp[cdb], /* db */
- tid, /* transaction ID */
- &dkey, /* key */
- &ddata, /* data */
- 0))) { /* flags */
- if (ret == DB_LOCK_DEADLOCK) {
- txabort(tid);
- goto retry;
- } else {
- syslog(LOG_EMERG, "cdb_store(%d): %s", cdb, db_strerror(ret));
- cdb_abort();
- }
- } else {
- txcommit(tid);
- if (compressing) {
- free(compressed_data);
- }
- return ret;
- }
- }
- return ret;
-}
-
-
-/*
- * Delete a piece of data. Returns 0 if the operation was successful.
- */
-int cdb_delete(int cdb, void *key, int keylen)
-{
-
- DBT dkey;
- DB_TXN *tid;
- int ret;
-
- memset(&dkey, 0, sizeof dkey);
- dkey.size = keylen;
- dkey.data = key;
-
- if (TSD->tid != NULL) {
- ret = dbp[cdb]->del(dbp[cdb], TSD->tid, &dkey, 0);
- if (ret) {
- syslog(LOG_EMERG, "cdb_delete(%d): %s\n", cdb, db_strerror(ret));
- if (ret != DB_NOTFOUND) {
- cdb_abort();
- }
- }
- } else {
- bailIfCursor(TSD->cursors, "attempt to delete during r/o cursor");
-
- retry:
- txbegin(&tid);
-
- if ((ret = dbp[cdb]->del(dbp[cdb], tid, &dkey, 0))
- && ret != DB_NOTFOUND) {
- if (ret == DB_LOCK_DEADLOCK) {
- txabort(tid);
- goto retry;
- } else {
- syslog(LOG_EMERG, "cdb_delete(%d): %s\n",
- cdb, db_strerror(ret));
- cdb_abort();
- }
- } else {
- txcommit(tid);
- }
- }
- return ret;
-}
-
-static DBC *localcursor(int cdb)
-{
- int ret;
- DBC *curs;
-
- if (TSD->cursors[cdb] == NULL)
- ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &curs, 0);
- else
- ret = TSD->cursors[cdb]->c_dup(TSD->cursors[cdb], &curs, DB_POSITION);
-
- if (ret) {
- syslog(LOG_EMERG, "localcursor: %s\n", db_strerror(ret));
- cdb_abort();
- }
-
- return curs;
-}
-
-
-/*
- * Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
- * a struct cdbdata which it is the caller's responsibility to free later on
- * using the cdb_free() routine.
- */
-struct cdbdata *cdb_fetch(int cdb, void *key, int keylen)
-{
-
- struct cdbdata *tempcdb;
- DBT dkey, dret;
- int ret;
-
- memset(&dkey, 0, sizeof(DBT));
- dkey.size = keylen;
- dkey.data = key;
-
- if (TSD->tid != NULL) {
- memset(&dret, 0, sizeof(DBT));
- dret.flags = DB_DBT_MALLOC;
- ret = dbp[cdb]->get(dbp[cdb], TSD->tid, &dkey, &dret, 0);
- } else {
- DBC *curs;
-
- do {
- memset(&dret, 0, sizeof(DBT));
- dret.flags = DB_DBT_MALLOC;
-
- curs = localcursor(cdb);
-
- ret = curs->c_get(curs, &dkey, &dret, DB_SET);
- cclose(curs);
- }
- while (ret == DB_LOCK_DEADLOCK);
-
- }
-
- if ((ret != 0) && (ret != DB_NOTFOUND)) {
- syslog(LOG_EMERG, "cdb_fetch(%d): %s\n", cdb, db_strerror(ret));
- cdb_abort();
- }
-
- if (ret != 0)
- return NULL;
- tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
-
- if (tempcdb == NULL) {
- syslog(LOG_EMERG, "cdb_fetch: Cannot allocate memory for tempcdb\n");
- cdb_abort();
- }
-
- tempcdb->len = dret.size;
- tempcdb->ptr = dret.data;
- cdb_decompress_if_necessary(tempcdb);
- return (tempcdb);
-}
-
-
-/*
- * Free a cdbdata item.
- *
- * Note that we only free the 'ptr' portion if it is not NULL. This allows
- * other code to assume ownership of that memory simply by storing the
- * pointer elsewhere and then setting 'ptr' to NULL. cdb_free() will then
- * avoid freeing it.
- */
-void cdb_free(struct cdbdata *cdb)
-{
- if (cdb->ptr) {
- free(cdb->ptr);
- }
- free(cdb);
-}
-
-void cdb_close_cursor(int cdb)
-{
- if (TSD->cursors[cdb] != NULL) {
- cclose(TSD->cursors[cdb]);
- }
-
- TSD->cursors[cdb] = NULL;
-}
-
-/*
- * Prepare for a sequential search of an entire database.
- * (There is guaranteed to be no more than one traversal in
- * progress per thread at any given time.)
- */
-void cdb_rewind(int cdb)
-{
- int ret = 0;
-
- if (TSD->cursors[cdb] != NULL) {
- syslog(LOG_EMERG,
- "cdb_rewind: must close cursor on database %d before reopening.\n", cdb);
- cdb_abort();
- /* cclose(TSD->cursors[cdb]); */
- }
-
- /*
- * Now initialize the cursor
- */
- ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &TSD->cursors[cdb], 0);
- if (ret) {
- syslog(LOG_EMERG, "cdb_rewind: db_cursor: %s\n", db_strerror(ret));
- cdb_abort();
- }
-}
-
-
-/*
- * Fetch the next item in a sequential search. Returns a pointer to a
- * cdbdata structure, or NULL if we've hit the end.
- */
-struct cdbdata *cdb_next_item(int cdb)
-{
- DBT key, data;
- struct cdbdata *cdbret;
- int ret = 0;
-
- /* Initialize the key/data pair so the flags aren't set. */
- memset(&key, 0, sizeof(key));
- memset(&data, 0, sizeof(data));
- data.flags = DB_DBT_MALLOC;
-
- ret = TSD->cursors[cdb]->c_get(TSD->cursors[cdb], &key, &data, DB_NEXT);
-
- if (ret) {
- if (ret != DB_NOTFOUND) {
- syslog(LOG_EMERG, "cdb_next_item(%d): %s\n", cdb, db_strerror(ret));
- cdb_abort();
- }
- cdb_close_cursor(cdb);
- return NULL; /* presumably, end of file */
- }
-
- cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
- cdbret->len = data.size;
- cdbret->ptr = data.data;
- cdb_decompress_if_necessary(cdbret);
-
- return (cdbret);
-}
-
-
-
-/*
- * Transaction-based stuff. I'm writing this as I bake cookies...
- */
-
-void cdb_begin_transaction(void)
-{
-
- bailIfCursor(TSD->cursors, "can't begin transaction during r/o cursor");
-
- if (TSD->tid != NULL) {
- syslog(LOG_EMERG, "cdb_begin_transaction: ERROR: nested transaction\n");
- cdb_abort();
- }
-
- txbegin(&TSD->tid);
-}
-
-void cdb_end_transaction(void)
-{
- int i;
-
- for (i = 0; i < MAXCDB; i++)
- if (TSD->cursors[i] != NULL) {
- syslog(LOG_WARNING,
- "cdb_end_transaction: WARNING: cursor %d still open at transaction end\n",
- i);
- cclose(TSD->cursors[i]);
- TSD->cursors[i] = NULL;
- }
-
- if (TSD->tid == NULL) {
- syslog(LOG_EMERG,
- "cdb_end_transaction: ERROR: txcommit(NULL) !!\n");
- cdb_abort();
- } else {
- txcommit(TSD->tid);
- }
-
- TSD->tid = NULL;
-}
-
-/*
- * Truncate (delete every record)
- */
-void cdb_trunc(int cdb)
-{
- /* DB_TXN *tid; */
- int ret;
- u_int32_t count;
-
- if (TSD->tid != NULL) {
- syslog(LOG_EMERG, "cdb_trunc must not be called in a transaction.");
- cdb_abort();
- } else {
- bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
-
- retry:
- /* txbegin(&tid); */
-
- if ((ret = dbp[cdb]->truncate(dbp[cdb], /* db */
- NULL, /* transaction ID */
- &count, /* #rows deleted */
- 0))) { /* flags */
- if (ret == DB_LOCK_DEADLOCK) {
- /* txabort(tid); */
- goto retry;
- } else {
- syslog(LOG_EMERG, "cdb_truncate(%d): %s\n", cdb, db_strerror(ret));
- if (ret == ENOMEM) {
- syslog(LOG_EMERG, "You may need to tune your database; please read http://www.citadel.org/doku.php/faq:troubleshooting:out_of_lock_entries for more information.");
- }
- exit(CTDLEXIT_DB);
- }
- } else {
- /* txcommit(tid); */
- }
- }
-}
projects / citadel.git / blobdiff