net/mwan3/files/usr/sbin/mwan3track

   1 #!/bin/sh
   2
   3 LOG="/usr/bin/logger -t $(basename "$0")[$$] -p"
   4 INTERFACE=""
   5
   6 clean_up() {
   7         $LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
   8         rm "/var/run/mwan3track-${INTERFACE}.pid" &> /dev/null
   9         exit 0
  10 }
  11
  12 main() {
  13
  14         [ -z "$12" ] && echo "Error: should not be started manually" && exit 0
  15
  16         INTERFACE=$1
  17         echo "$$" > /var/run/mwan3track-$1.pid
  18         trap clean_up SIGINT SIGTERM
  19
  20         local score=$(($7+$8))
  21         local track_ips=$(echo $* | cut -d ' ' -f 12-99)
  22         local host_up_count=0
  23         local lost=0
  24         local sleep_time=0
  25
  26         while true; do
  27
  28                 sleep_time=$6
  29
  30                 for track_ip in $track_ips; do
  31                         ping -I $2 -c $4 -W $5 -s $9 -q $track_ip &> /dev/null
  32                         if [ $? -eq 0 ]; then
  33                                 let host_up_count++
  34                         else
  35                                 let lost++
  36                         fi
  37                 done
  38
  39                 if [ $host_up_count -lt $3 ]; then
  40                         let score--
  41
  42                         if [ $score -lt $8 ]; then
  43                                 score=0
  44                         else
  45                                 sleep_time=$10
  46                         fi
  47
  48                         if [ $score -eq $8 ]; then
  49                                 $LOG notice "Interface $1 ($2) is offline"
  50                                 env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
  51                                 score=0
  52                         fi
  53                 else
  54                         if [ $score -lt $(($7+$8)) ] && [ $lost -gt 0 ]; then
  55                                 $LOG info "Lost $(($lost*$4)) ping(s) on interface $1 ($2)"
  56                         fi
  57
  58                         let score++
  59                         lost=0
  60
  61                         if [ $score -gt $8 ]; then
  62                                 score=$(($7+$8))
  63                         elif [ $score -le $8 ]; then
  64                                 sleep_time=$11
  65                         fi
  66
  67                         if [ $score -eq $8 ]; then
  68                                 $LOG notice "Interface $1 ($2) is online"
  69                                 env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
  70                                 rm /var/run/mwan3track-$1.pid
  71                                 exit 0
  72                         fi
  73                 fi
  74
  75                 host_up_count=0
  76                 sleep $sleep_time
  77         done
  78 }
  79
  80 main "$@"