src/core/audit-fd.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20
  21 #include <errno.h>
  22
  23 #include "audit-fd.h"
  24
  25 #ifdef HAVE_AUDIT
  26
  27 #include <libaudit.h>
  28 #include <stdbool.h>
  29
  30 #include "fd-util.h"
  31 #include "log.h"
  32 #include "util.h"
  33
  34 static bool initialized = false;
  35 static int audit_fd;
  36
  37 int get_audit_fd(void) {
  38
  39         if (!initialized) {
  40                 audit_fd = audit_open();
  41
  42                 if (audit_fd < 0) {
  43                         if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
  44                                 log_error_errno(errno, "Failed to connect to audit log: %m");
  45
  46                         audit_fd = errno ? -errno : -EINVAL;
  47                 }
  48
  49                 initialized = true;
  50         }
  51
  52         return audit_fd;
  53 }
  54
  55 void close_audit_fd(void) {
  56
  57         if (initialized && audit_fd >= 0)
  58                 safe_close(audit_fd);
  59
  60         initialized = true;
  61         audit_fd = -ECONNRESET;
  62 }
  63
  64 #else
  65
  66 int get_audit_fd(void) {
  67         return -EAFNOSUPPORT;
  68 }
  69
  70 void close_audit_fd(void) {
  71 }
  72
  73 #endif