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bcdbbd7e KS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
e8af6973 | 6 | Copyright 2014 Kay Sievers, Lennart Poettering |
bcdbbd7e KS |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
bcdbbd7e | 22 | #include "sd-event.h" |
687ed123 | 23 | #include "sd-daemon.h" |
84e51726 LP |
24 | #include "capability.h" |
25 | #include "clock-util.h" | |
26 | #include "network-util.h" | |
24882e06 | 27 | #include "signal-util.h" |
d636d376 | 28 | |
84e51726 LP |
29 | #include "timesyncd-manager.h" |
30 | #include "timesyncd-conf.h" | |
d636d376 KS |
31 | |
32 | static int load_clock_timestamp(uid_t uid, gid_t gid) { | |
ece6e766 | 33 | _cleanup_close_ int fd = -1; |
d636d376 KS |
34 | usec_t min = TIME_EPOCH * USEC_PER_SEC; |
35 | usec_t ct; | |
36 | int r; | |
ece6e766 LP |
37 | |
38 | /* Let's try to make sure that the clock is always | |
39 | * monotonically increasing, by saving the clock whenever we | |
40 | * have a new NTP time, or when we shut down, and restoring it | |
41 | * when we start again. This is particularly helpful on | |
42 | * systems lacking a battery backed RTC. We also will adjust | |
43 | * the time to at least the build time of systemd. */ | |
44 | ||
d636d376 KS |
45 | fd = open("/var/lib/systemd/clock", O_RDWR|O_CLOEXEC, 0644); |
46 | if (fd >= 0) { | |
ece6e766 | 47 | struct stat st; |
d636d376 KS |
48 | usec_t stamp; |
49 | ||
50 | /* check if the recorded time is later than the compiled-in one */ | |
51 | r = fstat(fd, &st); | |
52 | if (r >= 0) { | |
53 | stamp = timespec_load(&st.st_mtim); | |
54 | if (stamp > min) | |
55 | min = stamp; | |
ece6e766 LP |
56 | } |
57 | ||
d636d376 KS |
58 | /* Try to fix the access mode, so that we can still |
59 | touch the file after dropping priviliges */ | |
60 | fchmod(fd, 0644); | |
61 | fchown(fd, uid, gid); | |
62 | ||
63 | } else | |
64 | /* create stamp file with the compiled-in date */ | |
65 | touch_file("/var/lib/systemd/clock", true, min, uid, gid, 0644); | |
ece6e766 LP |
66 | |
67 | ct = now(CLOCK_REALTIME); | |
d636d376 | 68 | if (ct < min) { |
ece6e766 | 69 | struct timespec ts; |
d636d376 | 70 | char date[FORMAT_TIMESTAMP_MAX]; |
ece6e766 | 71 | |
d636d376 KS |
72 | log_info("System clock time unset or jumped backwards, restoring from recorded timestamp: %s", |
73 | format_timestamp(date, sizeof(date), min)); | |
ece6e766 | 74 | |
d636d376 | 75 | if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0) |
56f64d95 | 76 | log_error_errno(errno, "Failed to restore system clock: %m"); |
ece6e766 LP |
77 | } |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
687ed123 | 82 | int main(int argc, char *argv[]) { |
84e51726 | 83 | _cleanup_(manager_freep) Manager *m = NULL; |
cedc8c44 | 84 | const char *user = "systemd-timesync"; |
ece6e766 LP |
85 | uid_t uid; |
86 | gid_t gid; | |
687ed123 KS |
87 | int r; |
88 | ||
89 | log_set_target(LOG_TARGET_AUTO); | |
e8af6973 | 90 | log_set_facility(LOG_CRON); |
687ed123 KS |
91 | log_parse_environment(); |
92 | log_open(); | |
93 | ||
e8af6973 LP |
94 | umask(0022); |
95 | ||
84e51726 LP |
96 | if (argc != 1) { |
97 | log_error("This program does not take arguments."); | |
98 | r = -EINVAL; | |
99 | goto finish; | |
100 | } | |
101 | ||
ece6e766 LP |
102 | r = get_user_creds(&user, &uid, &gid, NULL, NULL); |
103 | if (r < 0) { | |
da927ba9 | 104 | log_error_errno(r, "Cannot resolve user name %s: %m", user); |
84e51726 | 105 | goto finish; |
ece6e766 LP |
106 | } |
107 | ||
d636d376 | 108 | r = load_clock_timestamp(uid, gid); |
ece6e766 | 109 | if (r < 0) |
84e51726 | 110 | goto finish; |
ece6e766 | 111 | |
966bff26 | 112 | r = drop_privileges(uid, gid, (1ULL << CAP_SYS_TIME)); |
a349eb10 | 113 | if (r < 0) |
84e51726 | 114 | goto finish; |
a349eb10 | 115 | |
72c0a2c2 | 116 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); |
856a5a7d | 117 | |
687ed123 | 118 | r = manager_new(&m); |
856a5a7d | 119 | if (r < 0) { |
da927ba9 | 120 | log_error_errno(r, "Failed to allocate manager: %m"); |
84e51726 | 121 | goto finish; |
856a5a7d | 122 | } |
687ed123 | 123 | |
c264aeab KS |
124 | if (clock_is_localtime() > 0) { |
125 | log_info("The system is configured to read the RTC time in the local time zone. " | |
126 | "This mode can not be fully supported. All system time to RTC updates are disabled."); | |
127 | m->rtc_local_time = true; | |
128 | } | |
129 | ||
84e51726 LP |
130 | r = manager_parse_config_file(m); |
131 | if (r < 0) | |
da927ba9 | 132 | log_warning_errno(r, "Failed to parse configuration file: %m"); |
e0e5ce23 | 133 | |
e8af6973 | 134 | log_debug("systemd-timesyncd running as pid %lu", (unsigned long) getpid()); |
af4ec430 LP |
135 | sd_notify(false, |
136 | "READY=1\n" | |
137 | "STATUS=Daemon is running"); | |
39594d49 | 138 | |
e0e5ce23 TG |
139 | if (network_is_online()) { |
140 | r = manager_connect(m); | |
141 | if (r < 0) | |
84e51726 | 142 | goto finish; |
e0e5ce23 | 143 | } |
678522cf | 144 | |
687ed123 | 145 | r = sd_event_loop(m->event); |
856a5a7d | 146 | if (r < 0) { |
da927ba9 | 147 | log_error_errno(r, "Failed to run event loop: %m"); |
84e51726 | 148 | goto finish; |
856a5a7d LP |
149 | } |
150 | ||
d636d376 KS |
151 | /* if we got an authoritative time, store it in the file system */ |
152 | if (m->sync) | |
153 | touch("/var/lib/systemd/clock"); | |
687ed123 | 154 | |
84e51726 LP |
155 | sd_event_get_exit_code(m->event, &r); |
156 | ||
157 | finish: | |
af4ec430 LP |
158 | sd_notify(false, |
159 | "STOPPING=1\n" | |
160 | "STATUS=Shutting down..."); | |
e8af6973 | 161 | |
687ed123 | 162 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
bcdbbd7e | 163 | } |