src/journal/journald-wall.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2014 Sebastian Thorarensen
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include "alloc-util.h"
  22 #include "format-util.h"
  23 #include "journald-server.h"
  24 #include "journald-wall.h"
  25 #include "process-util.h"
  26 #include "string-util.h"
  27 #include "utmp-wtmp.h"
  28
  29 void server_forward_wall(
  30                 Server *s,
  31                 int priority,
  32                 const char *identifier,
  33                 const char *message,
  34                 const struct ucred *ucred) {
  35
  36         _cleanup_free_ char *ident_buf = NULL, *l_buf = NULL;
  37         const char *l;
  38         int r;
  39
  40         assert(s);
  41         assert(message);
  42
  43         if (LOG_PRI(priority) > s->max_level_wall)
  44                 return;
  45
  46         if (ucred) {
  47                 if (!identifier) {
  48                         get_process_comm(ucred->pid, &ident_buf);
  49                         identifier = ident_buf;
  50                 }
  51
  52                 if (asprintf(&l_buf, "%s["PID_FMT"]: %s", strempty(identifier), ucred->pid, message) < 0) {
  53                         log_oom();
  54                         return;
  55                 }
  56
  57                 l = l_buf;
  58
  59         } else if (identifier) {
  60
  61                 l = l_buf = strjoin(identifier, ": ", message);
  62                 if (!l_buf) {
  63                         log_oom();
  64                         return;
  65                 }
  66         } else
  67                 l = message;
  68
  69         r = utmp_wall(l, "systemd-journald", NULL, NULL, NULL);
  70         if (r < 0)
  71                 log_debug_errno(r, "Failed to send wall message: %m");
  72 }