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/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd 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 2.1 of the License, or
(at your option) any later version.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include "audit-fd.h"
#if HAVE_AUDIT
#include <libaudit.h>
#include <stdbool.h>
#include "capability-util.h"
#include "fd-util.h"
#include "log.h"
#include "util.h"
static bool initialized = false;
static int audit_fd;
int get_audit_fd(void) {
if (!initialized) {
if (have_effective_cap(CAP_AUDIT_WRITE) == 0) {
audit_fd = -EPERM;
initialized = true;
return audit_fd;
}
audit_fd = audit_open();
if (audit_fd < 0) {
if (!IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT))
log_error_errno(errno, "Failed to connect to audit log: %m");
audit_fd = errno ? -errno : -EINVAL;
}
initialized = true;
}
return audit_fd;
}
void close_audit_fd(void) {
if (initialized && audit_fd >= 0)
safe_close(audit_fd);
initialized = true;
audit_fd = -ECONNRESET;
}
#else
int get_audit_fd(void) {
return -EAFNOSUPPORT;
}
void close_audit_fd(void) {
}
#endif
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