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util: add support for other NTP eras

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NTP timestamps use only 32 bits to count seconds and the current NTP era
ends in 2036. Add support for converting NTP timestamps from other NTP
eras on systems with 64-bit time_t.

The earliest assumed NTP time is set by the configure script (by default
to 50 years before the date of the build) and earlier NTP timestamps
underflow to the following NTP era.
This commit is contained in:
Miroslav Lichvar
2014-08-07 17:08:19 +02:00
parent cb88cea3c4
commit 474b2af1a6
3 changed files with 75 additions and 6 deletions
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33
configure vendored
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@@ -114,6 +114,8 @@ For better control, use the options below.
--disable-linuxcaps Disable Linux capabilities support
--disable-asyncdns Disable asynchronous name resolving
--disable-forcednsretry Don't retry on permanent DNS error
--with-ntp-era=SECONDS Specify earliest assumed NTP time in seconds
since 1970-01-01 [50*365 days ago]
--with-user=USER Specify default chronyd user [root]
--with-sendmail=PATH Path to sendmail binary [/usr/lib/sendmail]
--enable-debug Enable debugging support
@@ -194,6 +196,7 @@ try_setsched=0
try_lockmem=0
feat_asyncdns=1
feat_forcednsretry=1
ntp_era_split=""
default_user="root"
mail_program="/usr/lib/sendmail"
@@ -275,6 +278,9 @@ do
--disable-forcednsretry)
feat_forcednsretry=0
;;
--with-ntp-era=* )
ntp_era_split=`echo $option | sed -e 's/^.*=//;'`
;;
--with-user=* )
default_user=`echo $option | sed -e 's/^.*=//;'`
;;
@@ -381,6 +387,33 @@ if test_code '64-bit time_t' 'time.h' '' '' '
return x[0];'
then
add_def HAVE_LONG_TIME_T 1
if [ "x$ntp_era_split" != "x" ]; then
split_seconds=$ntp_era_split
split_days=0
else
split_seconds=`date '+%s'`
if [ "x$split_seconds" = "" ]; then
echo "Could not get current time, --with-ntp-era option is needed"
exit 1
fi
split_days=$((50 * 365))
fi
add_def NTP_ERA_SPLIT "(${split_seconds}LL - $split_days * 24 * 3600)"
date_format='+%Y-%m-%dT%H:%M:%SZ'
# Print the full NTP interval if a suitable date is found
if [ "x`date -u -d '1970-01-01 UTC 9 days ago 5 seconds 3 seconds' \
$date_format 2> /dev/null`" = "x1969-12-23T00:00:08Z" ]
then
time1="`date -u -d "1970-01-01 UTC $split_days days ago $split_seconds seconds" \
$date_format`"
time2="`date -u -d "1970-01-01 UTC $split_days days ago $split_seconds seconds 4294967296 seconds" \
$date_format`"
echo "NTP time mapped to $time1/$time2"
fi
fi
MATHCODE='return (int) pow(2.0, log(sqrt((double)argc)));'