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bcdbbd7e KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
e8af6973 | 4 | Copyright 2014 Kay Sievers, Lennart Poettering |
bcdbbd7e KS |
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 | ||
687ed123 | 20 | #include "sd-daemon.h" |
3ffd4af2 LP |
21 | #include "sd-event.h" |
22 | ||
430f0182 | 23 | #include "capability-util.h" |
84e51726 | 24 | #include "clock-util.h" |
3ffd4af2 | 25 | #include "fd-util.h" |
f4f15635 | 26 | #include "fs-util.h" |
84e51726 | 27 | #include "network-util.h" |
24882e06 | 28 | #include "signal-util.h" |
84e51726 | 29 | #include "timesyncd-conf.h" |
3ffd4af2 | 30 | #include "timesyncd-manager.h" |
b1d4f8e1 | 31 | #include "user-util.h" |
d636d376 KS |
32 | |
33 | static int load_clock_timestamp(uid_t uid, gid_t gid) { | |
ece6e766 | 34 | _cleanup_close_ int fd = -1; |
d636d376 KS |
35 | usec_t min = TIME_EPOCH * USEC_PER_SEC; |
36 | usec_t ct; | |
37 | int r; | |
ece6e766 LP |
38 | |
39 | /* Let's try to make sure that the clock is always | |
40 | * monotonically increasing, by saving the clock whenever we | |
41 | * have a new NTP time, or when we shut down, and restoring it | |
42 | * when we start again. This is particularly helpful on | |
43 | * systems lacking a battery backed RTC. We also will adjust | |
44 | * the time to at least the build time of systemd. */ | |
45 | ||
d636d376 KS |
46 | fd = open("/var/lib/systemd/clock", O_RDWR|O_CLOEXEC, 0644); |
47 | if (fd >= 0) { | |
ece6e766 | 48 | struct stat st; |
d636d376 KS |
49 | usec_t stamp; |
50 | ||
51 | /* check if the recorded time is later than the compiled-in one */ | |
52 | r = fstat(fd, &st); | |
53 | if (r >= 0) { | |
54 | stamp = timespec_load(&st.st_mtim); | |
55 | if (stamp > min) | |
56 | min = stamp; | |
ece6e766 LP |
57 | } |
58 | ||
d636d376 KS |
59 | /* Try to fix the access mode, so that we can still |
60 | touch the file after dropping priviliges */ | |
ac5b0c13 LP |
61 | (void) fchmod(fd, 0644); |
62 | (void) fchown(fd, uid, gid); | |
d636d376 KS |
63 | |
64 | } else | |
65 | /* create stamp file with the compiled-in date */ | |
ac5b0c13 | 66 | (void) touch_file("/var/lib/systemd/clock", true, min, uid, gid, 0644); |
ece6e766 LP |
67 | |
68 | ct = now(CLOCK_REALTIME); | |
d636d376 | 69 | if (ct < min) { |
ece6e766 | 70 | struct timespec ts; |
d636d376 | 71 | char date[FORMAT_TIMESTAMP_MAX]; |
ece6e766 | 72 | |
d636d376 KS |
73 | log_info("System clock time unset or jumped backwards, restoring from recorded timestamp: %s", |
74 | format_timestamp(date, sizeof(date), min)); | |
ece6e766 | 75 | |
d636d376 | 76 | if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0) |
56f64d95 | 77 | log_error_errno(errno, "Failed to restore system clock: %m"); |
ece6e766 LP |
78 | } |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
687ed123 | 83 | int main(int argc, char *argv[]) { |
84e51726 | 84 | _cleanup_(manager_freep) Manager *m = NULL; |
cedc8c44 | 85 | const char *user = "systemd-timesync"; |
ece6e766 LP |
86 | uid_t uid; |
87 | gid_t gid; | |
687ed123 KS |
88 | int r; |
89 | ||
90 | log_set_target(LOG_TARGET_AUTO); | |
e8af6973 | 91 | log_set_facility(LOG_CRON); |
687ed123 KS |
92 | log_parse_environment(); |
93 | log_open(); | |
94 | ||
e8af6973 LP |
95 | umask(0022); |
96 | ||
84e51726 LP |
97 | if (argc != 1) { |
98 | log_error("This program does not take arguments."); | |
99 | r = -EINVAL; | |
100 | goto finish; | |
101 | } | |
102 | ||
ece6e766 LP |
103 | r = get_user_creds(&user, &uid, &gid, NULL, NULL); |
104 | if (r < 0) { | |
da927ba9 | 105 | log_error_errno(r, "Cannot resolve user name %s: %m", user); |
84e51726 | 106 | goto finish; |
ece6e766 LP |
107 | } |
108 | ||
d636d376 | 109 | r = load_clock_timestamp(uid, gid); |
ece6e766 | 110 | if (r < 0) |
84e51726 | 111 | goto finish; |
ece6e766 | 112 | |
966bff26 | 113 | r = drop_privileges(uid, gid, (1ULL << CAP_SYS_TIME)); |
a349eb10 | 114 | if (r < 0) |
84e51726 | 115 | goto finish; |
a349eb10 | 116 | |
72c0a2c2 | 117 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); |
856a5a7d | 118 | |
687ed123 | 119 | r = manager_new(&m); |
856a5a7d | 120 | if (r < 0) { |
da927ba9 | 121 | log_error_errno(r, "Failed to allocate manager: %m"); |
84e51726 | 122 | goto finish; |
856a5a7d | 123 | } |
687ed123 | 124 | |
6369641d | 125 | if (clock_is_localtime(NULL) > 0) { |
c264aeab KS |
126 | log_info("The system is configured to read the RTC time in the local time zone. " |
127 | "This mode can not be fully supported. All system time to RTC updates are disabled."); | |
128 | m->rtc_local_time = true; | |
129 | } | |
130 | ||
84e51726 LP |
131 | r = manager_parse_config_file(m); |
132 | if (r < 0) | |
da927ba9 | 133 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
e0e5ce23 | 134 | |
3745770a MB |
135 | assert_se(manager_parse_fallback_string(m, NTP_SERVERS) >= 0); |
136 | ||
aa36007c | 137 | log_debug("systemd-timesyncd running as pid " PID_FMT, getpid()); |
af4ec430 LP |
138 | sd_notify(false, |
139 | "READY=1\n" | |
140 | "STATUS=Daemon is running"); | |
39594d49 | 141 | |
e0e5ce23 TG |
142 | if (network_is_online()) { |
143 | r = manager_connect(m); | |
144 | if (r < 0) | |
84e51726 | 145 | goto finish; |
e0e5ce23 | 146 | } |
678522cf | 147 | |
687ed123 | 148 | r = sd_event_loop(m->event); |
856a5a7d | 149 | if (r < 0) { |
da927ba9 | 150 | log_error_errno(r, "Failed to run event loop: %m"); |
84e51726 | 151 | goto finish; |
856a5a7d LP |
152 | } |
153 | ||
d636d376 KS |
154 | /* if we got an authoritative time, store it in the file system */ |
155 | if (m->sync) | |
ac5b0c13 | 156 | (void) touch("/var/lib/systemd/clock"); |
687ed123 | 157 | |
84e51726 LP |
158 | sd_event_get_exit_code(m->event, &r); |
159 | ||
160 | finish: | |
af4ec430 LP |
161 | sd_notify(false, |
162 | "STOPPING=1\n" | |
163 | "STATUS=Shutting down..."); | |
e8af6973 | 164 | |
687ed123 | 165 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
bcdbbd7e | 166 | } |