Add default leap-seconds file. This should help ntp networks get the

leap second date correct

Updates to the file can be obtained from ftp://time.nist.gov/pub/ or
ftp://tycho.usno.navy.mil/pub/ntp/.

Suggested by:	dwmalone
Reviewed by:	roberto, dwmalone, delphij
Approved by:	roberto
MFC after:	1 week

5 files changed, 139 insertions, 0 deletions

diff --git a/etc/Makefile b/etc/Makefile
index 81b9a1973f2b..24c83d1eb2a9 100644
--- a/etc/Makefile
+++ b/etc/Makefile
@@ -240,6 +240,9 @@ distribution:
 	${_+_}cd ${.CURDIR}/defaults; ${MAKE} install
 	${_+_}cd ${.CURDIR}/devd; ${MAKE} install
 	${_+_}cd ${.CURDIR}/gss; ${MAKE} install
+.if ${MK_NTP} != "no"
+	${_+_}cd ${.CURDIR}/ntp; ${MAKE} install
+.endif
 	${_+_}cd ${.CURDIR}/periodic; ${MAKE} install
 .if ${MK_PKGBOOTSTRAP} != "no"
 	${_+_}cd ${.CURDIR}/pkg; ${MAKE} install
diff --git a/etc/mtree/BSD.var.dist b/etc/mtree/BSD.var.dist
index 7d4af0be5ab6..3a5852905f32 100644
--- a/etc/mtree/BSD.var.dist
+++ b/etc/mtree/BSD.var.dist
@@ -46,6 +46,8 @@
         ..
         ipf             mode=0700
         ..
+        ntp             mode=0700
+        ..
         pkg
         ..
         ports
diff --git a/etc/ntp.conf b/etc/ntp.conf
index ea3987766058..c4ad0aa1bde3 100644
--- a/etc/ntp.conf
+++ b/etc/ntp.conf
@@ -77,3 +77,8 @@ restrict 127.127.1.0
 #
 #server 127.127.1.0
 #fudge 127.127.1.0 stratum 10
+
+# See http://support.ntp.org/bin/view/Support/ConfiguringNTP#Section_6.14.
+# for documentation regarding leapfile. Updates to the file can be obtained
+# from ftp://time.nist.gov/pub/ or ftp://tycho.usno.navy.mil/pub/ntp/.
+leapfile "/etc/ntp/leap-seconds"
diff --git a/etc/ntp/Makefile b/etc/ntp/Makefile
new file mode 100644
index 000000000000..f1aff4f9006b
--- /dev/null
+++ b/etc/ntp/Makefile
@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+NO_OBJ=
+
+FILES=	leap-seconds
+
+FILESDIR=	/etc/ntp
+FILESMODE=	644
+
+.include <bsd.prog.mk>
diff --git a/etc/ntp/leap-seconds b/etc/ntp/leap-seconds
new file mode 100644
index 000000000000..b8b41f2d1179
--- /dev/null
+++ b/etc/ntp/leap-seconds
@@ -0,0 +1,119 @@
+#
+# $FreeBSD$
+#
+#	ATOMIC TIME.
+#	The Coordinated Universal Time (UTC) is the reference time scale derived 
+#	from The "Temps Atomique International" (TAI) calculated by the Bureau 
+#	International des Poids et Mesures (BIPM) using a worldwide network of atomic 
+#	clocks. UTC differs from TAI by an integer number of seconds; it is the basis 
+#	of all activities in the world. 
+#
+#
+#	ASTRONOMICAL TIME (UT1) is the time scale based on the rate of rotation of the earth. 
+#	It is now mainly derived from Very Long Baseline Interferometry (VLBI). The various 
+#	irregular fluctuations progressively detected in the rotation rate of the Earth lead 
+#	in 1972 to the replacement of UT1 by UTC as the reference time scale. 
+#
+#
+#	LEAP SECOND
+#	Atomic clocks are more stable than the rate of the earth rotatiob since the later 
+#	undergoes a full range of geophysical perturbations at various time scales (lunisolar 
+#	and core-mantle torques,atmospheric and oceanic effetcs, ...)
+#	Leap seconds are needed to keep the two time scales in agreement, i.e. UT1-UTC smaller 
+#	than 0.9 second. So, when necessary a "leap second" is introduced in UTC.
+#	Since the adoption of this system in 1972 it has been necessary to add 26 seconds to UTC, 
+#	firstly due to the initial choice of the value of the second (1/86400 mean solar day of 
+#	the year 1820) and secondly to the general slowing down of the Earth's rotation. It is 
+#	theorically possible to have a negative leap second (a second removed from UTC), but so far, 
+#	all leap seconds have been positive (a second has been added to UTC). Based on what we know about the earth's rotation, 
+#	it is unlikely that we will ever have a negative leap second.
+#
+#
+#	HISTORY
+#	The first leap second was added on June 30, 1972. Until 2000, it was necessary in average to add a leap second at a rate 
+#	of 1 to 2 years. Since 2000, due to the fact that the earth rate of rotation is accelerating, leap seconds are introduced 
+#	with an average  frequency of 3 to 4 years.
+#
+#
+#	RESPONSABILITY OF THE DECISION TO INTRODUCE A LEAP SECOND IN UTC
+#	The decision to introduce a leap second in UTC is the responsibility of the Earth Orientation Center of 
+#	the International Earth Rotation and reference System Service (IERS). This center is located at Paris 
+#	Observatory. According to international agreements, leap second date have to occur at fixed date :
+#	first preference is given to the end of December and June, and second preference at the end of March 
+#	and September. Since the system was introduced in 1972, only dates in June and December were used.
+#
+#		Questions or comments to:
+#			Daniel Gambis, daniel.gambis@obspm.fr
+#			Christian Bizouard:  christian.bizouard@obspm.fr
+#			Earth orientation Center of the IERS
+#			Paris Observatory, France	
+#			
+#
+#
+#	VALIDITY OF THE FILE
+#	It is important to express the validity of the file. These next two dates are
+#	given in units of seconds since 1900.0.
+#
+#	1) Last update of the file. 
+#
+#	Updated through IERS Bulletin C (ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat)
+#
+#	The following line shows the last update of this file in NTP timestamp: 
+#
+#$	3645216000 
+#	 
+#	2) Expiration date of the file given on a semi-annual basis: last June or last December
+#
+#	File expires on 28 December 2015
+#
+#	Expire date in NTP timestamp: 
+#
+#@	3660249600
+#
+#
+#	LIST OF LEAP SECONDS
+#	NTP timestamp (X parameter) is the number of seconds since 1900.0
+#
+#	MJD: The Modified Julian Day number. MJD = X/86400 + 15020
+#
+#	DTAI: The difference DTAI= TAI-UTC in units of seconds
+#	It is the quantity to add to UTC to get the time in TAI
+#
+#	Day Month Year : epoch in clear
+#
+#NTP Time      DTAI    Day Month Year
+#
+2272060800      10      # 1 Jan 1972
+2287785600      11      # 1 Jul 1972
+2303683200      12      # 1 Jan 1973
+2335219200      13      # 1 Jan 1974
+2366755200      14      # 1 Jan 1975
+2398291200      15      # 1 Jan 1976
+2429913600      16      # 1 Jan 1977
+2461449600      17      # 1 Jan 1978
+2492985600      18      # 1 Jan 1979
+2524521600      19      # 1 Jan 1980
+2571782400      20      # 1 Jul 1981
+2603318400      21      # 1 Jul 1982
+2634854400      22      # 1 Jul 1983
+2698012800      23      # 1 Jul 1985
+2776982400      24      # 1 Jan 1988
+2840140800      25      # 1 Jan 1990
+2871676800      26      # 1 Jan 1991
+2918937600      27      # 1 Jul 1992
+2950473600      28      # 1 Jul 1993
+2982009600      29      # 1 Jul 1994
+3029443200      30      # 1 Jan 1996
+3076704000      31      # 1 Jul 1997
+3124137600      32      # 1 Jan 1999
+3345062400      33      # 1 Jan 2006
+3439756800      34      # 1 Jan 2009
+3550089600      35      # 1 Jul 2012
+3644697600      36      # 1 Jul 2015
+#
+#	In order to verify the integrity of this file, a hash code 
+#	has been generated. For more information how to use
+#	this hash code, please consult the README file under the 
+#	'sha' repertory.
+#
+#h	620ba8af 37900668 95ac09ba d77640f9 6fd75493