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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
bcdbbd7e KS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
e8af6973 | 5 | Copyright 2014 Kay Sievers, Lennart Poettering |
bcdbbd7e KS |
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 | ||
687ed123 | 21 | #include "sd-daemon.h" |
3ffd4af2 LP |
22 | #include "sd-event.h" |
23 | ||
430f0182 | 24 | #include "capability-util.h" |
84e51726 | 25 | #include "clock-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
f4f15635 | 27 | #include "fs-util.h" |
53d133ea | 28 | #include "mkdir.h" |
84e51726 | 29 | #include "network-util.h" |
df0ff127 | 30 | #include "process-util.h" |
24882e06 | 31 | #include "signal-util.h" |
84e51726 | 32 | #include "timesyncd-conf.h" |
3ffd4af2 | 33 | #include "timesyncd-manager.h" |
b1d4f8e1 | 34 | #include "user-util.h" |
d636d376 KS |
35 | |
36 | static int load_clock_timestamp(uid_t uid, gid_t gid) { | |
ece6e766 | 37 | _cleanup_close_ int fd = -1; |
d636d376 KS |
38 | usec_t min = TIME_EPOCH * USEC_PER_SEC; |
39 | usec_t ct; | |
40 | int r; | |
ece6e766 LP |
41 | |
42 | /* Let's try to make sure that the clock is always | |
43 | * monotonically increasing, by saving the clock whenever we | |
44 | * have a new NTP time, or when we shut down, and restoring it | |
45 | * when we start again. This is particularly helpful on | |
46 | * systems lacking a battery backed RTC. We also will adjust | |
47 | * the time to at least the build time of systemd. */ | |
48 | ||
53d133ea | 49 | fd = open("/var/lib/systemd/timesync/clock", O_RDWR|O_CLOEXEC, 0644); |
d636d376 | 50 | if (fd >= 0) { |
ece6e766 | 51 | struct stat st; |
d636d376 KS |
52 | usec_t stamp; |
53 | ||
54 | /* check if the recorded time is later than the compiled-in one */ | |
55 | r = fstat(fd, &st); | |
56 | if (r >= 0) { | |
57 | stamp = timespec_load(&st.st_mtim); | |
58 | if (stamp > min) | |
59 | min = stamp; | |
ece6e766 LP |
60 | } |
61 | ||
53d133ea YW |
62 | if (geteuid() == 0) { |
63 | /* Try to fix the access mode, so that we can still | |
64 | touch the file after dropping priviliges */ | |
65 | r = fchmod(fd, 0644); | |
66 | if (r < 0) | |
67 | return log_error_errno(errno, "Failed to change file access mode: %m"); | |
68 | r = fchown(fd, uid, gid); | |
69 | return log_error_errno(errno, "Failed to change file owner: %m"); | |
70 | } | |
71 | ||
72 | } else { | |
48d3e88c | 73 | r = mkdir_safe_label("/var/lib/systemd/timesync", 0755, uid, gid, true); |
53d133ea YW |
74 | if (r < 0) |
75 | return log_error_errno(r, "Failed to create state directory: %m"); | |
d636d376 | 76 | |
d636d376 | 77 | /* create stamp file with the compiled-in date */ |
53d133ea YW |
78 | (void) touch_file("/var/lib/systemd/timesync/clock", false, min, uid, gid, 0644); |
79 | } | |
ece6e766 LP |
80 | |
81 | ct = now(CLOCK_REALTIME); | |
d636d376 | 82 | if (ct < min) { |
ece6e766 | 83 | struct timespec ts; |
d636d376 | 84 | char date[FORMAT_TIMESTAMP_MAX]; |
ece6e766 | 85 | |
d636d376 KS |
86 | log_info("System clock time unset or jumped backwards, restoring from recorded timestamp: %s", |
87 | format_timestamp(date, sizeof(date), min)); | |
ece6e766 | 88 | |
d636d376 | 89 | if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0) |
56f64d95 | 90 | log_error_errno(errno, "Failed to restore system clock: %m"); |
ece6e766 LP |
91 | } |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
687ed123 | 96 | int main(int argc, char *argv[]) { |
84e51726 | 97 | _cleanup_(manager_freep) Manager *m = NULL; |
cedc8c44 | 98 | const char *user = "systemd-timesync"; |
ece6e766 LP |
99 | uid_t uid; |
100 | gid_t gid; | |
687ed123 KS |
101 | int r; |
102 | ||
103 | log_set_target(LOG_TARGET_AUTO); | |
e8af6973 | 104 | log_set_facility(LOG_CRON); |
687ed123 KS |
105 | log_parse_environment(); |
106 | log_open(); | |
107 | ||
e8af6973 LP |
108 | umask(0022); |
109 | ||
84e51726 LP |
110 | if (argc != 1) { |
111 | log_error("This program does not take arguments."); | |
112 | r = -EINVAL; | |
113 | goto finish; | |
114 | } | |
115 | ||
ece6e766 LP |
116 | r = get_user_creds(&user, &uid, &gid, NULL, NULL); |
117 | if (r < 0) { | |
da927ba9 | 118 | log_error_errno(r, "Cannot resolve user name %s: %m", user); |
84e51726 | 119 | goto finish; |
ece6e766 LP |
120 | } |
121 | ||
d636d376 | 122 | r = load_clock_timestamp(uid, gid); |
ece6e766 | 123 | if (r < 0) |
84e51726 | 124 | goto finish; |
ece6e766 | 125 | |
87a85e25 YW |
126 | /* Drop privileges, but only if we have been started as root. If we are not running as root we assume all |
127 | * privileges are already dropped. */ | |
128 | if (geteuid() == 0) { | |
129 | r = drop_privileges(uid, gid, (1ULL << CAP_SYS_TIME)); | |
130 | if (r < 0) | |
131 | goto finish; | |
132 | } | |
a349eb10 | 133 | |
72c0a2c2 | 134 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); |
856a5a7d | 135 | |
687ed123 | 136 | r = manager_new(&m); |
856a5a7d | 137 | if (r < 0) { |
da927ba9 | 138 | log_error_errno(r, "Failed to allocate manager: %m"); |
84e51726 | 139 | goto finish; |
856a5a7d | 140 | } |
687ed123 | 141 | |
6369641d | 142 | if (clock_is_localtime(NULL) > 0) { |
c264aeab KS |
143 | log_info("The system is configured to read the RTC time in the local time zone. " |
144 | "This mode can not be fully supported. All system time to RTC updates are disabled."); | |
145 | m->rtc_local_time = true; | |
146 | } | |
147 | ||
84e51726 LP |
148 | r = manager_parse_config_file(m); |
149 | if (r < 0) | |
da927ba9 | 150 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
e0e5ce23 | 151 | |
c4c06912 LP |
152 | r = manager_parse_fallback_string(m, NTP_SERVERS); |
153 | if (r < 0) { | |
154 | log_error_errno(r, "Failed to parse fallback server strings: %m"); | |
155 | goto finish; | |
156 | } | |
3745770a | 157 | |
df0ff127 | 158 | log_debug("systemd-timesyncd running as pid " PID_FMT, getpid_cached()); |
af4ec430 LP |
159 | sd_notify(false, |
160 | "READY=1\n" | |
161 | "STATUS=Daemon is running"); | |
39594d49 | 162 | |
e0e5ce23 TG |
163 | if (network_is_online()) { |
164 | r = manager_connect(m); | |
165 | if (r < 0) | |
84e51726 | 166 | goto finish; |
e0e5ce23 | 167 | } |
678522cf | 168 | |
687ed123 | 169 | r = sd_event_loop(m->event); |
856a5a7d | 170 | if (r < 0) { |
da927ba9 | 171 | log_error_errno(r, "Failed to run event loop: %m"); |
84e51726 | 172 | goto finish; |
856a5a7d LP |
173 | } |
174 | ||
d636d376 KS |
175 | /* if we got an authoritative time, store it in the file system */ |
176 | if (m->sync) | |
53d133ea | 177 | (void) touch("/var/lib/systemd/timesync/clock"); |
687ed123 | 178 | |
84e51726 LP |
179 | sd_event_get_exit_code(m->event, &r); |
180 | ||
181 | finish: | |
af4ec430 LP |
182 | sd_notify(false, |
183 | "STOPPING=1\n" | |
184 | "STATUS=Shutting down..."); | |
e8af6973 | 185 | |
687ed123 | 186 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
bcdbbd7e | 187 | } |