ntpd revision 304879 
1#!/bin/sh
2#
3# $FreeBSD: stable/11/etc/rc.d/ntpd 304879 2016-08-27 02:53:21Z cy $
4#
5
6# PROVIDE: ntpd
7# REQUIRE: DAEMON ntpdate FILESYSTEMS devfs
8# BEFORE:  LOGIN
9# KEYWORD: nojail shutdown
10
11. /etc/rc.subr
12
13name="ntpd"
14desc="Network Time Protocol daemon"
15rcvar="ntpd_enable"
16command="/usr/sbin/${name}"
17pidfile="/var/run/${name}.pid"
18extra_commands="fetch"
19fetch_cmd="ntpd_fetch_leapfile"
20start_precmd="ntpd_precmd"
21
22load_rc_config $name
23
24ntpd_precmd()
25{
26	rc_flags="-c ${ntpd_config} ${ntpd_flags}"
27
28	if checkyesno ntpd_sync_on_start; then
29		rc_flags="-g $rc_flags"
30	fi
31
32	ntpd_init_leapfile
33
34	if [ ! -f $ntp_db_leapfile ]; then
35		ntpd_fetch_leapfile
36	fi
37
38	if [ -z "$ntpd_chrootdir" ]; then
39		return 0;
40	fi
41
42	# If running in a chroot cage, ensure that the appropriate files
43	# exist inside the cage, as well as helper symlinks into the cage
44	# from outside.
45	#
46	# As this is called after the is_running and required_dir checks
47	# are made in run_rc_command(), we can safely assume ${ntpd_chrootdir}
48	# exists and ntpd isn't running at this point (unless forcestart
49	# is used).
50	#
51	if [ ! -c "${ntpd_chrootdir}/dev/clockctl" ]; then
52		rm -f "${ntpd_chrootdir}/dev/clockctl"
53		( cd /dev ; /bin/pax -rw -pe clockctl "${ntpd_chrootdir}/dev" )
54	fi
55	ln -fs "${ntpd_chrootdir}/var/db/ntp.drift" /var/db/ntp.drift
56	ln -fs "${ntpd_chrootdir}${ntp_tmp_leapfile}" ${ntp_tmp_leapfile}
57
58	#	Change run_rc_commands()'s internal copy of $ntpd_flags
59	#
60	rc_flags="-u ntpd:ntpd -i ${ntpd_chrootdir} $rc_flags"
61}
62
63current_ntp_ts() {
64	# Seconds between 1900-01-01 and 1970-01-01
65	# echo $(((70*365+17)*86400))
66	ntp_to_unix=2208988800
67
68	echo $(($(date -u +%s)+$ntp_to_unix))
69}
70	
71get_ntp_leapfile_ver() {
72	# Leapfile update date (version number).
73	expr "$(awk '$1 == "#$" { print $2 }' "$1" 2>/dev/null)" : \
74		'^\([1-9][0-9]*\)$' \| 0
75}
76
77get_ntp_leapfile_expiry() {
78	# Leapfile expiry date.
79	expr "$(awk '$1 == "#@" { print $2 }' "$1" 2>/dev/null)" : \
80		'^\([1-9][0-9]*\)$' \| 0
81}
82
83ntpd_init_leapfile() {
84	# Refresh working leapfile with an invalid hash due to
85	# FreeBSD id header. Ntpd will ignore leapfiles with a
86	# mismatch hash. The file must be the virgin file from
87	# the source.
88	if [ ! -f $ntp_db_leapfile ]; then
89		cp -p $ntp_src_leapfile $ntp_db_leapfile
90	fi
91}
92
93ntpd_fetch_leapfile() {
94	local ntp_tmp_leapfile rc verbose
95	
96	if checkyesno ntp_leapfile_fetch_verbose; then
97		verbose=echo
98	else
99		verbose=:
100	fi
101
102	ntp_tmp_leapfile="/var/run/ntpd.leap-seconds.list"
103
104	ntp_ver_no_src=$(get_ntp_leapfile_ver $ntp_src_leapfile)
105	ntp_expiry_src=$(get_ntp_leapfile_expiry $ntp_src_leapfile)
106	ntp_ver_no_db=$(get_ntp_leapfile_ver $ntp_db_leapfile)
107	ntp_expiry_db=$(get_ntp_leapfile_expiry $ntp_db_leapfile)
108	$verbose ntp_src_leapfile version is $ntp_ver_no_src
109	$verbose ntp_db_leapfile version is $ntp_ver_no_db
110
111	if [ "$ntp_ver_no_src" -gt "$ntp_ver_no_db" -o \
112	     "$ntp_ver_no_src" -eq "$ntp_ver_no_db" -a \
113	     "$ntp_expiry_src" -gt "$ntp_expiry_db" ]; then
114		$verbose replacing $ntp_db_leapfile with $ntp_src_leapfile 
115		cp -p $ntp_src_leapfile $ntp_db_leapfile
116		ntp_ver_no_db=$ntp_ver_no_src
117	else
118		$verbose not replacing $ntp_db_leapfile with $ntp_src_leapfile 
119	fi
120	ntp_leapfile_expiry_seconds=$((ntp_leapfile_expiry_days*86400))
121	ntp_leap_expiry=$(get_ntp_leapfile_expiry $ntp_db_leapfile)
122	ntp_leap_fetch_date=$((ntp_leap_expiry-ntp_leapfile_expiry_seconds))
123	if [ $(current_ntp_ts) -ge $ntp_leap_fetch_date ]; then
124		$verbose Within ntp leapfile expiry limit, initiating fetch
125		for url in $ntp_leapfile_sources ; do
126			$verbose fetching $url
127			fetch $ntp_leapfile_fetch_opts -o $ntp_tmp_leapfile $url && break
128		done
129		ntp_ver_no_tmp=$(get_ntp_leapfile_ver $ntp_tmp_leapfile)
130		ntp_expiry_tmp=$(get_ntp_leapfile_expiry $ntp_tmp_leapfile)
131		if [ "$ntp_ver_no_tmp" -gt "$ntp_ver_no_db" -o \
132		     "$ntp_ver_no_tmp" -eq "$ntp_ver_no_db" -a \
133		     "$ntp_expiry_tmp" -gt "$ntp_expiry_db" ]; then
134			$verbose using $url as $ntp_db_leapfile
135			mv $ntp_tmp_leapfile $ntp_db_leapfile
136		else
137			$verbose using existing $ntp_db_leapfile
138		fi
139	fi
140}
141
142run_rc_command "$1"
143