#!/bin/sh
# Please make sure the paths below are correct.
# Alternatively you can put them in $0.conf, meaning if you've named
# this script ntp-client then it must go in ntp-client.conf .
#
# NTPQV output version of "ntpq -c rv"
# Version 4 is the most common and up to date version.
#
# If you are unsure, which to set, run this script and make sure that
# the JSON output variables match that in "ntpq -c rv".
#
################################################################
# Don't change anything unless you know what are you doing     #
################################################################
BIN_NTPQ='/usr/bin/env ntpq'
BIN_GREP='/usr/bin/env grep'
BIN_AWK='/usr/bin/env awk'

CONFIG=$0".conf"
if [ -f "$CONFIG" ]; then
    # shellcheck disable=SC1090
    . "$CONFIG"
fi

NTP_OFFSET=$($BIN_NTPQ -c rv | $BIN_GREP "offset" | $BIN_AWK -Foffset= '{print $2}' | $BIN_AWK -F, '{print $1}')
NTP_FREQUENCY=$($BIN_NTPQ -c rv | $BIN_GREP "frequency" | $BIN_AWK -Ffrequency= '{print $2}' | $BIN_AWK -F, '{print $1}')
NTP_SYS_JITTER=$($BIN_NTPQ -c rv | $BIN_GREP "sys_jitter" | $BIN_AWK -Fsys_jitter= '{print $2}' | $BIN_AWK -F, '{print $1}')
NTP_CLK_JITTER=$($BIN_NTPQ -c rv | $BIN_GREP "clk_jitter" | $BIN_AWK -Fclk_jitter= '{print $2}' | $BIN_AWK -F, '{print $1}')
NTP_WANDER=$($BIN_NTPQ -c rv | $BIN_GREP "clk_wander" | $BIN_AWK -Fclk_wander= '{print $2}' | $BIN_AWK -F, '{print $1}')
NTP_VERSION=$($BIN_NTPQ -c rv | $BIN_GREP "version" | $BIN_AWK -F'ntpd ' '{print $2}' | $BIN_AWK -F. '{print $1}')

echo '{"data":{"offset":"'"$NTP_OFFSET"'","frequency":"'"$NTP_FREQUENCY"'","sys_jitter":"'"$NTP_SYS_JITTER"'","clk_jitter":"'"$NTP_CLK_JITTER"'","clk_wander":"'"$NTP_WANDER"'"},"version":"'"$NTP_VERSION"'","error":"0","errorString":""}'

exit 0