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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <sys/stat.h>
#include <unistd.h>
#include "utils/common/util_conf.h"
#include "contrib/string.h"
#include "knot/common/log.h"
#include "knot/conf/conf.h"
#include "libknot/attribute.h"
#include "utils/common/msg.h"
bool util_conf_initialized(void)
{
return (conf() != NULL);
}
int util_conf_init_confdb(const char *confdb)
{
if (util_conf_initialized()) {
ERR2("configuration already initialized");
util_conf_deinit();
return KNOT_ESEMCHECK;
}
size_t max_conf_size = (size_t)CONF_MAPSIZE * 1024 * 1024;
conf_flag_t flags = CONF_FNOHOSTNAME | CONF_FOPTMODULES;
if (confdb != NULL) {
flags |= CONF_FREADONLY;
}
log_init();
log_levels_set(LOG_TARGET_STDOUT, LOG_SOURCE_ANY, 0);
log_levels_set(LOG_TARGET_STDERR, LOG_SOURCE_ANY, LOG_UPTO(LOG_WARNING));
log_levels_set(LOG_TARGET_SYSLOG, LOG_SOURCE_ANY, 0);
log_flag_set(LOG_FLAG_NOTIMESTAMP | LOG_FLAG_NOINFO);
conf_t *new_conf = NULL;
int ret = conf_new(&new_conf, conf_schema, confdb, max_conf_size, flags);
if (ret != KNOT_EOK) {
ERR2("failed opening configuration database '%s' (%s)",
(confdb == NULL ? "" : confdb), knot_strerror(ret));
} else {
conf_update(new_conf, CONF_UPD_FNONE);
}
return ret;
}
int util_conf_init_file(const char *conffile)
{
int ret = util_conf_init_confdb(NULL);
if (ret != KNOT_EOK) {
return ret;
}
ret = conf_import(conf(), conffile, true, false);
if (ret != KNOT_EOK) {
ERR2("failed opening configuration file '%s' (%s)",
conffile, knot_strerror(ret));
}
return ret;
}
int util_conf_init_justdb(const char *db_type, const char *db_path)
{
int ret = util_conf_init_confdb(NULL);
if (ret != KNOT_EOK) {
return ret;
}
char *conf_str = sprintf_alloc("database:\n"
" storage: .\n"
" %s: \"%s\"\n", db_type, db_path);
if (conf_str == NULL) {
return KNOT_ENOMEM;
}
ret = conf_import(conf(), conf_str, false, false);
free(conf_str);
if (ret != KNOT_EOK) {
ERR2("failed creating temporary configuration (%s)", knot_strerror(ret));
}
return ret;
}
int util_conf_init_default(bool allow_db)
{
struct stat st;
if (util_conf_initialized()) {
return KNOT_EOK;
} else if (conf_db_exists(CONF_DEFAULT_DBDIR)) {
return util_conf_init_confdb(CONF_DEFAULT_DBDIR);
} else if (stat(CONF_DEFAULT_FILE, &st) == 0) {
return util_conf_init_file(CONF_DEFAULT_FILE);
} else {
ERR2("couldn't initialize configuration, please provide %s option",
(allow_db ? "-c, -C, or -D" : "-c or -C"));
return KNOT_EINVAL;
}
}
void util_update_privileges(void)
{
int uid, gid;
if (conf_user(conf(), &uid, &gid) != KNOT_EOK) {
return;
}
// Just try to alter process privileges if different from configured.
_unused_ int unused;
if ((gid_t)gid != getgid()) {
unused = setregid(gid, gid);
}
if ((uid_t)uid != getuid()) {
unused = setreuid(uid, uid);
}
}
void util_conf_deinit(void)
{
log_close();
conf_update(NULL, CONF_UPD_FNONE);
}
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