LCOV - code coverage report
Current view: top level - login - logind-utmp.c (source / functions) Hit Total Coverage
Test: main_coverage.info Lines: 0 78 0.0 %
Date: 2019-08-22 15:41:25 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: LGPL-2.1+ */
       2             : 
       3             : #include <errno.h>
       4             : #include <pwd.h>
       5             : #include <string.h>
       6             : #include <unistd.h>
       7             : 
       8             : #include "sd-messages.h"
       9             : 
      10             : #include "alloc-util.h"
      11             : #include "audit-util.h"
      12             : #include "bus-common-errors.h"
      13             : #include "bus-error.h"
      14             : #include "bus-util.h"
      15             : #include "format-util.h"
      16             : #include "logind.h"
      17             : #include "path-util.h"
      18             : #include "special.h"
      19             : #include "strv.h"
      20             : #include "unit-name.h"
      21             : #include "user-util.h"
      22             : #include "utmp-wtmp.h"
      23             : 
      24           0 : _const_ static usec_t when_wall(usec_t n, usec_t elapse) {
      25             : 
      26             :         usec_t left;
      27             :         unsigned i;
      28             :         static const int wall_timers[] = {
      29             :                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
      30             :                 25, 40, 55, 70, 100, 130, 150, 180,
      31             :         };
      32             : 
      33             :         /* If the time is already passed, then don't announce */
      34           0 :         if (n >= elapse)
      35           0 :                 return 0;
      36             : 
      37           0 :         left = elapse - n;
      38             : 
      39           0 :         for (i = 1; i < ELEMENTSOF(wall_timers); i++)
      40           0 :                 if (wall_timers[i] * USEC_PER_MINUTE >= left)
      41           0 :                         return left - wall_timers[i-1] * USEC_PER_MINUTE;
      42             : 
      43           0 :         return left % USEC_PER_HOUR;
      44             : }
      45             : 
      46           0 : bool logind_wall_tty_filter(const char *tty, void *userdata) {
      47           0 :         Manager *m = userdata;
      48             :         const char *p;
      49             : 
      50           0 :         assert(m);
      51             : 
      52           0 :         if (!m->scheduled_shutdown_tty)
      53           0 :                 return true;
      54             : 
      55           0 :         p = path_startswith(tty, "/dev/");
      56           0 :         if (!p)
      57           0 :                 return true;
      58             : 
      59           0 :         return !streq(p, m->scheduled_shutdown_tty);
      60             : }
      61             : 
      62           0 : static int warn_wall(Manager *m, usec_t n) {
      63           0 :         char date[FORMAT_TIMESTAMP_MAX] = {};
      64           0 :         _cleanup_free_ char *l = NULL, *username = NULL;
      65             :         usec_t left;
      66             :         int r;
      67             : 
      68           0 :         assert(m);
      69             : 
      70           0 :         if (!m->enable_wall_messages)
      71           0 :                 return 0;
      72             : 
      73           0 :         left = m->scheduled_shutdown_timeout > n;
      74             : 
      75           0 :         r = asprintf(&l, "%s%sThe system is going down for %s %s%s!",
      76           0 :                      strempty(m->wall_message),
      77           0 :                      isempty(m->wall_message) ? "" : "\n",
      78             :                      m->scheduled_shutdown_type,
      79             :                      left ? "at " : "NOW",
      80           0 :                      left ? format_timestamp(date, sizeof(date), m->scheduled_shutdown_timeout) : "");
      81           0 :         if (r < 0) {
      82           0 :                 log_oom();
      83           0 :                 return 0;
      84             :         }
      85             : 
      86           0 :         username = uid_to_name(m->scheduled_shutdown_uid);
      87           0 :         utmp_wall(l, username, m->scheduled_shutdown_tty, logind_wall_tty_filter, m);
      88             : 
      89           0 :         return 1;
      90             : }
      91             : 
      92           0 : static int wall_message_timeout_handler(
      93             :                         sd_event_source *s,
      94             :                         uint64_t usec,
      95             :                         void *userdata) {
      96             : 
      97           0 :         Manager *m = userdata;
      98             :         usec_t n, next;
      99             :         int r;
     100             : 
     101           0 :         assert(m);
     102           0 :         assert(s == m->wall_message_timeout_source);
     103             : 
     104           0 :         n = now(CLOCK_REALTIME);
     105             : 
     106           0 :         r = warn_wall(m, n);
     107           0 :         if (r == 0)
     108           0 :                 return 0;
     109             : 
     110           0 :         next = when_wall(n, m->scheduled_shutdown_timeout);
     111           0 :         if (next > 0) {
     112           0 :                 r = sd_event_source_set_time(s, n + next);
     113           0 :                 if (r < 0)
     114           0 :                         return log_error_errno(r, "sd_event_source_set_time() failed. %m");
     115             : 
     116           0 :                 r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
     117           0 :                 if (r < 0)
     118           0 :                         return log_error_errno(r, "sd_event_source_set_enabled() failed. %m");
     119             :         }
     120             : 
     121           0 :         return 0;
     122             : }
     123             : 
     124           0 : int manager_setup_wall_message_timer(Manager *m) {
     125             : 
     126             :         usec_t n, elapse;
     127             :         int r;
     128             : 
     129           0 :         assert(m);
     130             : 
     131           0 :         n = now(CLOCK_REALTIME);
     132           0 :         elapse = m->scheduled_shutdown_timeout;
     133             : 
     134             :         /* wall message handling */
     135             : 
     136           0 :         if (isempty(m->scheduled_shutdown_type)) {
     137           0 :                 warn_wall(m, n);
     138           0 :                 return 0;
     139             :         }
     140             : 
     141           0 :         if (elapse < n)
     142           0 :                 return 0;
     143             : 
     144             :         /* Warn immediately if less than 15 minutes are left */
     145           0 :         if (elapse - n < 15 * USEC_PER_MINUTE) {
     146           0 :                 r = warn_wall(m, n);
     147           0 :                 if (r == 0)
     148           0 :                         return 0;
     149             :         }
     150             : 
     151           0 :         elapse = when_wall(n, elapse);
     152           0 :         if (elapse == 0)
     153           0 :                 return 0;
     154             : 
     155           0 :         if (m->wall_message_timeout_source) {
     156           0 :                 r = sd_event_source_set_time(m->wall_message_timeout_source, n + elapse);
     157           0 :                 if (r < 0)
     158           0 :                         return log_error_errno(r, "sd_event_source_set_time() failed. %m");
     159             : 
     160           0 :                 r = sd_event_source_set_enabled(m->wall_message_timeout_source, SD_EVENT_ONESHOT);
     161           0 :                 if (r < 0)
     162           0 :                         return log_error_errno(r, "sd_event_source_set_enabled() failed. %m");
     163             :         } else {
     164           0 :                 r = sd_event_add_time(m->event, &m->wall_message_timeout_source,
     165             :                                       CLOCK_REALTIME, n + elapse, 0, wall_message_timeout_handler, m);
     166           0 :                 if (r < 0)
     167           0 :                         return log_error_errno(r, "sd_event_add_time() failed. %m");
     168             :         }
     169             : 
     170           0 :         return 0;
     171             : }

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