1 // Copyright (c) 1987-2023 by the citadel.org team
2 // This program is open source software. Use, duplication, or disclosure
3 // are subject to the terms of the GNU General Public License, version 3.
5 // The functions in this file handle the selection and activation of a storage backend for Citadel Server.
6 // Right now, it simply activates Berkeley DB because that's the only one we have.
8 #include "../../sysdep.h"
14 #include <libcitadel.h>
15 #include "../../ctdl_module.h"
16 #include "../../control.h"
17 #include "../../citserver.h"
18 #include "../../config.h"
20 // Header files for all available backends must be included here.
21 #include "../berkeley_db/berkeley_db.h"
23 // Backends must include implementations of all these functions, but with their own prefix instead of "cdb_".
24 // The initialization function of the selected backend will map them.
25 void (*cdb_open_databases)(void) = NULL;
26 void (*cdb_close_databases)(void) = NULL;
27 struct cdbdata (*cdb_fetch)(int, const void *, int) = NULL;
28 int (*cdb_store)(int, const void *, int, void *, int) = NULL;
29 int (*cdb_delete)(int, void *, int) = NULL;
30 struct cdbkeyval (*cdb_next_item)(int) = NULL;
31 void (*cdb_close_cursor)(int) = NULL;
32 void (*cdb_begin_transaction)(void) = NULL;
33 void (*cdb_end_transaction)(void) = NULL;
34 void (*cdb_check_handles)(void) = NULL;
35 void (*cdb_trunc)(int) = NULL;
36 void (*check_handles)(void *) = NULL;
37 void (*cdb_compact)(void) = NULL;
38 void (*cdb_checkpoint)(void) = NULL;
39 void (*cdb_rewind)(int) = NULL;
40 void (*cdb_tick)(void) = NULL;
42 // This function is responsible for choosing and initializing a back end.
43 void cdb_init_backends(void) {
44 bdb_init_backend(); // for now, this is the only one, so we select it always.
48 // Make sure we own all the files, because in a few milliseconds we're going to drop root privs.
49 void cdb_chmod_data(void) {
52 char filename[PATH_MAX];
54 // Silently try to create the database subdirectory. If it's already there, no problem.
55 if ((mkdir(ctdl_db_dir, 0700) != 0) && (errno != EEXIST)) {
56 syslog(LOG_ERR, "bdb: database directory [%s] does not exist and could not be created: %m", ctdl_db_dir);
59 if (chmod(ctdl_db_dir, 0700) != 0) {
60 syslog(LOG_ERR, "bdb: unable to set database directory permissions [%s]: %m", ctdl_db_dir);
63 if (chown(ctdl_db_dir, ctdluid, (-1)) != 0) {
64 syslog(LOG_ERR, "bdb: unable to set the owner for [%s]: %m", ctdl_db_dir);
67 dp = opendir(ctdl_db_dir);
69 while (d = readdir(dp), d != NULL) {
70 if (d->d_name[0] != '.') {
71 snprintf(filename, sizeof filename, "%s/%s", ctdl_db_dir, d->d_name);
72 syslog(LOG_DEBUG, "bdb: chmod(%s, 0600) returned %d", filename, chmod(filename, 0600));
73 syslog(LOG_DEBUG, "bdb: chown(%s, ctdluid, -1) returned %d", filename, chown(filename, ctdluid, (-1)));