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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 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 <stdio.h>
#include "audit.h"
#include "fd-util.h"
#include "fileio.h"
#include "macro.h"
#include "process-util.h"
#include "util.h"
int audit_session_from_pid(pid_t pid, uint32_t *id) {
_cleanup_free_ char *s = NULL;
const char *p;
uint32_t u;
int r;
assert(id);
/* We don't convert ENOENT to ESRCH here, since we can't
* really distuingish between "audit is not available in the
* kernel" and "the process does not exist", both which will
* result in ENOENT. */
p = procfs_file_alloca(pid, "sessionid");
r = read_one_line_file(p, &s);
if (r < 0)
return r;
r = safe_atou32(s, &u);
if (r < 0)
return r;
if (u == AUDIT_SESSION_INVALID || u <= 0)
return -ENODATA;
*id = u;
return 0;
}
int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
_cleanup_free_ char *s = NULL;
const char *p;
uid_t u;
int r;
assert(uid);
p = procfs_file_alloca(pid, "loginuid");
r = read_one_line_file(p, &s);
if (r < 0)
return r;
r = parse_uid(s, &u);
if (r == -ENXIO) /* the UID was -1 */
return -ENODATA;
if (r < 0)
return r;
*uid = (uid_t) u;
return 0;
}
bool use_audit(void) {
static int cached_use = -1;
if (cached_use < 0) {
int fd;
fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
if (fd < 0)
cached_use = errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT;
else {
cached_use = true;
safe_close(fd);
}
}
return cached_use;
}
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