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/*
ldb database library
Copyright (C) Simo Sorce 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb modules core
*
* Description: core modules routines
*
* Author: Simo Sorce
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_private.h"
#include "dlinklist.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef HAVE_DLOPEN_DISABLED
#include <dlfcn.h>
#endif
#define LDB_MODULE_PREFIX "modules"
#define LDB_MODULE_PREFIX_LEN 7
#define LDB_MODULE_SEP ':'
int ldb_load_modules(struct ldb_context *ldb, const char *options[])
{
struct ldb_module *current;
char **modules;
int mnum, i;
/* find out which modules we are requested to activate */
modules = NULL;
mnum = 0;
if (options) {
char *q, *p;
for (i = 0; options[i] != NULL; i++) {
if (strncmp(options[i], LDB_MODULE_PREFIX,
LDB_MODULE_PREFIX_LEN) == 0) {
p = q = talloc_strdup(ldb, &options[i][LDB_MODULE_PREFIX_LEN]);
if (*q != ':') {
talloc_free(q);
return -1;
}
do {
*p = '\0';
q = p + 1;
mnum++;
modules = talloc_realloc(ldb, modules, char *, mnum);
if (!modules) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_load_modules()\n");
return -1;
}
modules[mnum - 1] = q;
} while ((p = strchr(q, LDB_MODULE_SEP)));
}
}
}
if (!modules && strcmp("ldap", ldb->modules->ops->name)) {
/* no modules in the options, look for @MODULES in the
db (not for ldap) */
int ret;
const char * const attrs[] = { "@LIST" , NULL};
struct ldb_message **msg = NULL;
char *modstr, *c, *p;
ret = ldb_search(ldb, "", LDB_SCOPE_BASE, "dn=@MODULES", attrs, &msg);
if (ret == 0) {
ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db\n");
} else {
if (ret < 0) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "ldb error (%s) occurred searching for modules, bailing out\n", ldb_errstring(ldb));
return -1;
}
if (ret > 1) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Too many records found, bailing out\n");
return -1;
}
/*
for (j = 0; j < msg[0]->num_elements; j++) {
for (k = 0; k < msg[0]->elements[j].num_values; k++) {
pn++;
modules = talloc_realloc(ldb, modules, char *, pn);
if (!modules) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in register_modules()\n");
return -1;
}
modules[pn - 1] = talloc_strndup(modules, msg[0]->elements[j].values[k].data, msg[0]->elements[j].values[k].length);
if (!modules[pn - 1]) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in register_modules()\n");
return -1;
}
}
}
*/
modstr = msg[0]->elements[0].values[0].data;
for (c = modstr, mnum = 0; c != NULL; mnum++) {
c = strchr(c, ',');
if (c != NULL) {
c++;
if (*c == '\0') { /* avoid failing if the modules string lasts with ',' */
break;
}
}
}
modules = talloc_array(ldb, char *, mnum);
if ( ! modules ) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_load_modules()\n");
return -1;
}
for (p = c = modstr, i = 0; mnum > i; i++) {
c = strchr(p, ',');
if (c) {
*c = '\0';
}
/* modules are seeked in inverse order. Lets place them as an admin would think the right order is */
modules[mnum - i - 1] = talloc_strdup(modules, p);
p = c + 1;
}
}
talloc_free(msg);
}
if (modules) {
for (i = 0; i < mnum; i++) {
#ifdef HAVE_DLOPEN_DISABLED
void *handle;
ldb_module_init_function init;
struct stat st;
char *filename;
const char *errstr;
#endif
if (strcmp(modules[i], "schema") == 0) {
current = schema_module_init(ldb, options);
if (!current) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "function 'init_module' in %s fails\n", modules[i]);
return -1;
}
DLIST_ADD(ldb->modules, current);
continue;
}
if (strcmp(modules[i], "timestamps") == 0) {
current = timestamps_module_init(ldb, options);
if (!current) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "function 'init_module' in %s fails\n", modules[i]);
return -1;
}
DLIST_ADD(ldb->modules, current);
continue;
}
if (strcmp(modules[i], "samldb") == 0) {
current = samldb_module_init(ldb, options);
if (!current) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "function 'init_module' in %s fails\n", modules[i]);
return -1;
}
DLIST_ADD(ldb->modules, current);
continue;
}
#ifdef HAVE_DLOPEN_DISABLED
filename = talloc_asprintf(ldb, "%s.so", modules[i]);
if (!filename) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Talloc failed!\n");
return -1;
}
if (stat(filename, &st) < 0) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Required module [%s] not found, bailing out!\n", modules[i]);
return -1;
}
handle = dlopen(filename, RTLD_LAZY);
if (!handle) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Error loading module %s [%s]\n", modules[i], dlerror());
return -1;
}
init = (ldb_module_init_function)dlsym(handle, "init_module");
errstr = dlerror();
if (errstr) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "Error trying to resolve symbol 'init_module' in %s [%s]\n", modules[i], errstr);
return -1;
}
current = init(ldb, options);
if (!current) {
ldb_debug(ldb, LDB_DEBUG_FATAL, "function 'init_module' in %s fails\n", modules[i]);
return -1;
}
DLIST_ADD(ldb->modules, current);
#else
ldb_debug(ldb, LDB_DEBUG_FATAL, "Required module [%s] not found, bailing out!\n", modules[i]);
return -1;
#endif
}
}
return 0;
}
/*
helper functions to call the next module in chain
*/
int ldb_next_search(struct ldb_module *module,
const char *base,
enum ldb_scope scope,
const char *expression,
const char * const *attrs, struct ldb_message ***res)
{
if (!module->next) {
return -1;
}
return module->next->ops->search(module->next, base, scope, expression, attrs, res);
}
int ldb_next_search_free(struct ldb_module *module, struct ldb_message **msg)
{
if (!module->next) {
return -1;
}
return module->next->ops->search_free(module->next, msg);
}
int ldb_next_add_record(struct ldb_module *module, const struct ldb_message *message)
{
if (!module->next) {
return -1;
}
return module->next->ops->add_record(module->next, message);
}
int ldb_next_modify_record(struct ldb_module *module, const struct ldb_message *message)
{
if (!module->next) {
return -1;
}
return module->next->ops->modify_record(module->next, message);
}
int ldb_next_delete_record(struct ldb_module *module, const char *dn)
{
if (!module->next) {
return -1;
}
return module->next->ops->delete_record(module->next, dn);
}
int ldb_next_rename_record(struct ldb_module *module, const char *olddn, const char *newdn)
{
if (!module->next) {
return -1;
}
return module->next->ops->rename_record(module->next, olddn, newdn);
}
int ldb_next_named_lock(struct ldb_module *module, const char *lockname)
{
if (!module->next) {
return -1;
}
return module->next->ops->named_lock(module->next, lockname);
}
int ldb_next_named_unlock(struct ldb_module *module, const char *lockname)
{
if (!module->next) {
return -1;
}
return module->next->ops->named_unlock(module->next, lockname);
}
const char *ldb_next_errstring(struct ldb_module *module)
{
if (!module->next) {
return NULL;
}
return module->next->ops->errstring(module->next);
}
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