net/ntpclient/files/ntpclient.hotplug

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 . /etc/functions.sh
   5
   6 unset IFACE
   7 unset SERVER
   8 unset PORT
   9 unset INTERVAL
  10 unset COUNT
  11 NTPC=`which ntpclient`
  12
  13 check_server() {
  14         local hostname
  15         local port
  16         [ -n "$SERVER" ] && return
  17         config_get hostname $1 hostname
  18         config_get port $1 port
  19         [ -z "$hostname" ] && return
  20         $NTPC -c 1 -p ${port:-123} -h $hostname > /dev/null && { SERVER=$hostname; PORT=${port:-123}; }
  21 }
  22
  23 set_drift() {
  24         config_get freq $1 freq
  25         [ -n "$freq" ] && adjtimex -f $freq >/dev/null
  26 }
  27
  28 start_ntpclient() {
  29         config_foreach set_drift ntpdrift
  30         config_foreach check_server ntpserver
  31         [ -z "$SERVER" ] && exit 0
  32         logger starting ntpclient
  33         $NTPC ${COUNT:+-c $COUNT} ${INTERVAL:+-i $INTERVAL} -D -p $PORT -h $SERVER 2> /dev/null
  34 }
  35
  36 stop_ntpclient() {
  37         logger stopping ntpclient
  38         killall ntpclient
  39 }
  40
  41 load_settings() {
  42         local interval
  43         local count
  44         local iface
  45
  46         config_get interval $1 interval
  47         config_get count $1 count
  48         config_get iface $1 iface
  49
  50         [ -n "$iface" ] && IFACE=$iface
  51         [ -n "$count" ] && COUNT=$count
  52         [ -n "$interval" ] && INTERVAL=$interval
  53 }
  54
  55 config_load ntpclient
  56 config_foreach load_settings ntpclient
  57
  58 # check if we only listen to a single iface
  59 [ -n "$IFACE" -a "$IFACE" != "$INTERFACE" ] && exit 0
  60
  61 DEF_ROUTE=`route -n | grep '^0.0.0.0'`
  62 NTP_RUNNING=`ps  | grep $NTPC | grep -v grep`
  63
  64 case "${ACTION:-ifup}" in
  65         ifup)
  66                 [ -n "$DEF_ROUTE" -a -z "$NTP_RUNNING" ] && start_ntpclient
  67         ;;
  68         ifdown)
  69                 [ -n "$NTP_RUNNING" ] && stop_ntpclient
  70         ;;
  71 esac