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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e2fa5721 DM |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2015 Daniel Mack | |
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 <errno.h> | |
cf0fbc49 | 22 | #include <pwd.h> |
e2fa5721 DM |
23 | #include <string.h> |
24 | #include <unistd.h> | |
e2fa5721 DM |
25 | |
26 | #include "sd-messages.h" | |
b1d4f8e1 | 27 | |
b5efdb8a | 28 | #include "alloc-util.h" |
430f0182 | 29 | #include "audit-util.h" |
e2fa5721 | 30 | #include "bus-common-errors.h" |
b1d4f8e1 LP |
31 | #include "bus-error.h" |
32 | #include "bus-util.h" | |
f97b34a6 | 33 | #include "format-util.h" |
b1d4f8e1 | 34 | #include "logind.h" |
27458ed6 | 35 | #include "path-util.h" |
b1d4f8e1 LP |
36 | #include "special.h" |
37 | #include "strv.h" | |
38 | #include "unit-name.h" | |
39 | #include "user-util.h" | |
e2fa5721 DM |
40 | #include "utmp-wtmp.h" |
41 | ||
42 | _const_ static usec_t when_wall(usec_t n, usec_t elapse) { | |
43 | ||
44 | usec_t left; | |
45 | unsigned int i; | |
46 | static const int wall_timers[] = { | |
47 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, | |
48 | 25, 40, 55, 70, 100, 130, 150, 180, | |
49 | }; | |
50 | ||
51 | /* If the time is already passed, then don't announce */ | |
52 | if (n >= elapse) | |
53 | return 0; | |
54 | ||
55 | left = elapse - n; | |
56 | ||
57 | for (i = 1; i < ELEMENTSOF(wall_timers); i++) | |
58 | if (wall_timers[i] * USEC_PER_MINUTE >= left) | |
59 | return left - wall_timers[i-1] * USEC_PER_MINUTE; | |
60 | ||
61 | return left % USEC_PER_HOUR; | |
62 | } | |
63 | ||
64 | bool logind_wall_tty_filter(const char *tty, void *userdata) { | |
e2fa5721 | 65 | Manager *m = userdata; |
27458ed6 | 66 | const char *p; |
e2fa5721 DM |
67 | |
68 | assert(m); | |
69 | ||
27458ed6 LP |
70 | if (!m->scheduled_shutdown_tty) |
71 | return true; | |
72 | ||
73 | p = path_startswith(tty, "/dev/"); | |
74 | if (!p) | |
e2fa5721 DM |
75 | return true; |
76 | ||
27458ed6 | 77 | return !streq(p, m->scheduled_shutdown_tty); |
e2fa5721 DM |
78 | } |
79 | ||
80 | static int warn_wall(Manager *m, usec_t n) { | |
81 | char date[FORMAT_TIMESTAMP_MAX] = {}; | |
82 | _cleanup_free_ char *l = NULL; | |
83 | usec_t left; | |
84 | int r; | |
85 | ||
86 | assert(m); | |
87 | ||
88 | if (!m->enable_wall_messages) | |
89 | return 0; | |
90 | ||
91 | left = m->scheduled_shutdown_timeout > n; | |
92 | ||
93 | r = asprintf(&l, "%s%sThe system is going down for %s %s%s!", | |
94 | strempty(m->wall_message), | |
95 | isempty(m->wall_message) ? "" : "\n", | |
96 | m->scheduled_shutdown_type, | |
97 | left ? "at " : "NOW", | |
98 | left ? format_timestamp(date, sizeof(date), m->scheduled_shutdown_timeout) : ""); | |
99 | if (r < 0) { | |
100 | log_oom(); | |
101 | return 0; | |
102 | } | |
103 | ||
d0260817 | 104 | utmp_wall(l, uid_to_name(m->scheduled_shutdown_uid), |
e2fa5721 DM |
105 | m->scheduled_shutdown_tty, logind_wall_tty_filter, m); |
106 | ||
107 | return 1; | |
108 | } | |
109 | ||
110 | static int wall_message_timeout_handler( | |
111 | sd_event_source *s, | |
112 | uint64_t usec, | |
113 | void *userdata) { | |
114 | ||
115 | Manager *m = userdata; | |
116 | usec_t n, next; | |
117 | int r; | |
118 | ||
119 | assert(m); | |
120 | assert(s == m->wall_message_timeout_source); | |
121 | ||
122 | n = now(CLOCK_REALTIME); | |
123 | ||
124 | r = warn_wall(m, n); | |
125 | if (r == 0) | |
126 | return 0; | |
127 | ||
128 | next = when_wall(n, m->scheduled_shutdown_timeout); | |
129 | if (next > 0) { | |
130 | r = sd_event_source_set_time(s, n + next); | |
131 | if (r < 0) | |
c2a23db0 | 132 | return log_error_errno(r, "sd_event_source_set_time() failed. %m"); |
e2fa5721 DM |
133 | |
134 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); | |
135 | if (r < 0) | |
c2a23db0 | 136 | return log_error_errno(r, "sd_event_source_set_enabled() failed. %m"); |
e2fa5721 DM |
137 | } |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | int manager_setup_wall_message_timer(Manager *m) { | |
143 | ||
144 | usec_t n, elapse; | |
145 | int r; | |
146 | ||
147 | assert(m); | |
148 | ||
149 | n = now(CLOCK_REALTIME); | |
150 | elapse = m->scheduled_shutdown_timeout; | |
151 | ||
152 | /* wall message handling */ | |
153 | ||
154 | if (isempty(m->scheduled_shutdown_type)) { | |
155 | warn_wall(m, n); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | if (elapse < n) | |
160 | return 0; | |
161 | ||
162 | /* Warn immediately if less than 15 minutes are left */ | |
163 | if (elapse - n < 15 * USEC_PER_MINUTE) { | |
164 | r = warn_wall(m, n); | |
165 | if (r == 0) | |
166 | return 0; | |
167 | } | |
168 | ||
169 | elapse = when_wall(n, elapse); | |
170 | if (elapse == 0) | |
171 | return 0; | |
172 | ||
173 | if (m->wall_message_timeout_source) { | |
174 | r = sd_event_source_set_time(m->wall_message_timeout_source, n + elapse); | |
175 | if (r < 0) | |
c2a23db0 | 176 | return log_error_errno(r, "sd_event_source_set_time() failed. %m"); |
e2fa5721 DM |
177 | |
178 | r = sd_event_source_set_enabled(m->wall_message_timeout_source, SD_EVENT_ONESHOT); | |
179 | if (r < 0) | |
c2a23db0 | 180 | return log_error_errno(r, "sd_event_source_set_enabled() failed. %m"); |
e2fa5721 DM |
181 | } else { |
182 | r = sd_event_add_time(m->event, &m->wall_message_timeout_source, | |
183 | CLOCK_REALTIME, n + elapse, 0, wall_message_timeout_handler, m); | |
184 | if (r < 0) | |
c2a23db0 | 185 | return log_error_errno(r, "sd_event_add_time() failed. %m"); |
e2fa5721 DM |
186 | } |
187 | ||
188 | return 0; | |
189 | } |