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e2fa5721 DM |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2015 Daniel Mack | |
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 | #include <errno.h> | |
cf0fbc49 | 21 | #include <pwd.h> |
e2fa5721 DM |
22 | #include <string.h> |
23 | #include <unistd.h> | |
e2fa5721 DM |
24 | |
25 | #include "sd-messages.h" | |
b1d4f8e1 | 26 | |
b5efdb8a | 27 | #include "alloc-util.h" |
430f0182 | 28 | #include "audit-util.h" |
e2fa5721 | 29 | #include "bus-common-errors.h" |
b1d4f8e1 LP |
30 | #include "bus-error.h" |
31 | #include "bus-util.h" | |
f97b34a6 | 32 | #include "format-util.h" |
b1d4f8e1 LP |
33 | #include "logind.h" |
34 | #include "special.h" | |
35 | #include "strv.h" | |
36 | #include "unit-name.h" | |
37 | #include "user-util.h" | |
e2fa5721 DM |
38 | #include "utmp-wtmp.h" |
39 | ||
40 | _const_ static usec_t when_wall(usec_t n, usec_t elapse) { | |
41 | ||
42 | usec_t left; | |
43 | unsigned int i; | |
44 | static const int wall_timers[] = { | |
45 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, | |
46 | 25, 40, 55, 70, 100, 130, 150, 180, | |
47 | }; | |
48 | ||
49 | /* If the time is already passed, then don't announce */ | |
50 | if (n >= elapse) | |
51 | return 0; | |
52 | ||
53 | left = elapse - n; | |
54 | ||
55 | for (i = 1; i < ELEMENTSOF(wall_timers); i++) | |
56 | if (wall_timers[i] * USEC_PER_MINUTE >= left) | |
57 | return left - wall_timers[i-1] * USEC_PER_MINUTE; | |
58 | ||
59 | return left % USEC_PER_HOUR; | |
60 | } | |
61 | ||
62 | bool logind_wall_tty_filter(const char *tty, void *userdata) { | |
63 | ||
64 | Manager *m = userdata; | |
65 | ||
66 | assert(m); | |
67 | ||
b4944d2d | 68 | if (!startswith(tty, "/dev/") || !m->scheduled_shutdown_tty) |
e2fa5721 DM |
69 | return true; |
70 | ||
71 | return !streq(tty + 5, m->scheduled_shutdown_tty); | |
72 | } | |
73 | ||
74 | static int warn_wall(Manager *m, usec_t n) { | |
75 | char date[FORMAT_TIMESTAMP_MAX] = {}; | |
76 | _cleanup_free_ char *l = NULL; | |
77 | usec_t left; | |
78 | int r; | |
79 | ||
80 | assert(m); | |
81 | ||
82 | if (!m->enable_wall_messages) | |
83 | return 0; | |
84 | ||
85 | left = m->scheduled_shutdown_timeout > n; | |
86 | ||
87 | r = asprintf(&l, "%s%sThe system is going down for %s %s%s!", | |
88 | strempty(m->wall_message), | |
89 | isempty(m->wall_message) ? "" : "\n", | |
90 | m->scheduled_shutdown_type, | |
91 | left ? "at " : "NOW", | |
92 | left ? format_timestamp(date, sizeof(date), m->scheduled_shutdown_timeout) : ""); | |
93 | if (r < 0) { | |
94 | log_oom(); | |
95 | return 0; | |
96 | } | |
97 | ||
d0260817 | 98 | utmp_wall(l, uid_to_name(m->scheduled_shutdown_uid), |
e2fa5721 DM |
99 | m->scheduled_shutdown_tty, logind_wall_tty_filter, m); |
100 | ||
101 | return 1; | |
102 | } | |
103 | ||
104 | static int wall_message_timeout_handler( | |
105 | sd_event_source *s, | |
106 | uint64_t usec, | |
107 | void *userdata) { | |
108 | ||
109 | Manager *m = userdata; | |
110 | usec_t n, next; | |
111 | int r; | |
112 | ||
113 | assert(m); | |
114 | assert(s == m->wall_message_timeout_source); | |
115 | ||
116 | n = now(CLOCK_REALTIME); | |
117 | ||
118 | r = warn_wall(m, n); | |
119 | if (r == 0) | |
120 | return 0; | |
121 | ||
122 | next = when_wall(n, m->scheduled_shutdown_timeout); | |
123 | if (next > 0) { | |
124 | r = sd_event_source_set_time(s, n + next); | |
125 | if (r < 0) | |
c2a23db0 | 126 | return log_error_errno(r, "sd_event_source_set_time() failed. %m"); |
e2fa5721 DM |
127 | |
128 | r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT); | |
129 | if (r < 0) | |
c2a23db0 | 130 | return log_error_errno(r, "sd_event_source_set_enabled() failed. %m"); |
e2fa5721 DM |
131 | } |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | int manager_setup_wall_message_timer(Manager *m) { | |
137 | ||
138 | usec_t n, elapse; | |
139 | int r; | |
140 | ||
141 | assert(m); | |
142 | ||
143 | n = now(CLOCK_REALTIME); | |
144 | elapse = m->scheduled_shutdown_timeout; | |
145 | ||
146 | /* wall message handling */ | |
147 | ||
148 | if (isempty(m->scheduled_shutdown_type)) { | |
149 | warn_wall(m, n); | |
150 | return 0; | |
151 | } | |
152 | ||
153 | if (elapse < n) | |
154 | return 0; | |
155 | ||
156 | /* Warn immediately if less than 15 minutes are left */ | |
157 | if (elapse - n < 15 * USEC_PER_MINUTE) { | |
158 | r = warn_wall(m, n); | |
159 | if (r == 0) | |
160 | return 0; | |
161 | } | |
162 | ||
163 | elapse = when_wall(n, elapse); | |
164 | if (elapse == 0) | |
165 | return 0; | |
166 | ||
167 | if (m->wall_message_timeout_source) { | |
168 | r = sd_event_source_set_time(m->wall_message_timeout_source, n + elapse); | |
169 | if (r < 0) | |
c2a23db0 | 170 | return log_error_errno(r, "sd_event_source_set_time() failed. %m"); |
e2fa5721 DM |
171 | |
172 | r = sd_event_source_set_enabled(m->wall_message_timeout_source, SD_EVENT_ONESHOT); | |
173 | if (r < 0) | |
c2a23db0 | 174 | return log_error_errno(r, "sd_event_source_set_enabled() failed. %m"); |
e2fa5721 DM |
175 | } else { |
176 | r = sd_event_add_time(m->event, &m->wall_message_timeout_source, | |
177 | CLOCK_REALTIME, n + elapse, 0, wall_message_timeout_handler, m); | |
178 | if (r < 0) | |
c2a23db0 | 179 | return log_error_errno(r, "sd_event_add_time() failed. %m"); |
e2fa5721 DM |
180 | } |
181 | ||
182 | return 0; | |
183 | } |