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/*
SSSD
tools_mc_util - interface to the memcache for userspace tools
Copyright (C) Red Hat 2013
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 <http://www.gnu.org/licenses/>.
*/
#include <talloc.h>
#include <fcntl.h>
#include "util/util.h"
#include "tools/tools_util.h"
#include "util/mmap_cache.h"
static errno_t sss_mc_set_recycled(int fd)
{
uint32_t w = SSS_MC_HEADER_RECYCLED;
struct sss_mc_header h;
off_t offset;
off_t pos;
int ret;
offset = MC_PTR_DIFF(&h.status, &h);
pos = lseek(fd, offset, SEEK_SET);
if (pos == -1) {
/* What do we do now ? */
return errno;
}
errno = 0;
ret = sss_atomic_write_s(fd, (uint8_t *)&w, sizeof(h.status));
if (ret == -1) {
return errno;
}
if (ret != sizeof(h.status)) {
/* Write error */
return EIO;
}
return EOK;
}
errno_t sss_memcache_invalidate(const char *mc_filename)
{
int mc_fd = -1;
errno_t ret;
errno_t pret;
useconds_t t = 50000;
int retries = 2;
if (!mc_filename) {
return EINVAL;
}
mc_fd = open(mc_filename, O_RDWR);
if (mc_fd == -1) {
ret = errno;
if (ret == ENOENT) {
DEBUG(SSSDBG_TRACE_FUNC,("Memory cache file %s "
"does not exist.\n", mc_filename));
return EOK;
} else {
DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to open file %s: %s\n",
mc_filename, strerror(ret)));
return ret;
}
}
ret = sss_br_lock_file(mc_fd, 0, 1, retries, t);
if (ret == EACCES) {
DEBUG(SSSDBG_TRACE_FUNC,
("File %s already locked by someone else.\n", mc_filename));
goto done;
} else if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to lock file %s.\n", mc_filename));
goto done;
}
/* Mark the mc file as recycled. */
ret = sss_mc_set_recycled(mc_fd);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to mark memory cache file %s "
"as recycled.\n", mc_filename));
goto done;
}
ret = EOK;
done:
if (mc_fd != -1) {
/* Closing the file also releases the lock */
close(mc_fd);
/* Only unlink the file if invalidation was succesful */
if (ret == EOK) {
pret = unlink(mc_filename);
if (pret == -1) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Failed to unlink file %s. "
"Will be unlinked later by sssd_nss.\n"));
}
}
}
return ret;
}
static int clear_fastcache(bool *sssd_nss_is_off)
{
int ret;
ret = sss_memcache_invalidate(SSS_NSS_MCACHE_DIR"/passwd");
if (ret != EOK) {
if (ret == EACCES) {
*sssd_nss_is_off = false;
return EOK;
} else {
return ret;
}
}
ret = sss_memcache_invalidate(SSS_NSS_MCACHE_DIR"/group");
if (ret != EOK) {
if (ret == EACCES) {
*sssd_nss_is_off = false;
return EOK;
} else {
return ret;
}
}
*sssd_nss_is_off = true;
return EOK;
}
errno_t sss_memcache_clear_all(void)
{
errno_t ret;
bool sssd_nss_is_off = false;
FILE *clear_mc_flag;
ret = clear_fastcache(&sssd_nss_is_off);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to clear caches.\n"));
return EIO;
}
if (!sssd_nss_is_off) {
/* sssd_nss is running -> signal monitor to invalidate fastcache */
clear_mc_flag = fopen(SSS_NSS_MCACHE_DIR"/"CLEAR_MC_FLAG, "w");
if (clear_mc_flag == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to create clear_mc_flag file. "
"Memory cache will not be cleared.\n"));
return EIO;
}
ret = fclose(clear_mc_flag);
if (ret != 0) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
("Unable to close file descriptor: %s\n",
strerror(ret)));
return EIO;
}
DEBUG(SSSDBG_TRACE_FUNC, ("Sending SIGHUP to monitor.\n"));
ret = signal_sssd(SIGHUP);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to send SIGHUP to monitor.\n"));
return EIO;
}
}
return EOK;
}
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