net/mwan3/files/usr/sbin/mwan3track

   1 #!/bin/sh
   2
   3 . /lib/functions.sh
   4
   5 LOG="/usr/bin/logger -t $(basename "$0")[$$] -p"
   6 INTERFACE=""
   7
   8 clean_up() {
   9         $LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
  10         rm "/var/run/mwan3track-${INTERFACE}.pid" &> /dev/null
  11         rm -rf "/var/run/mwan3track/${INTERFACE}" &> /dev/null
  12         if [ -z "$(ls -A "/var/run/mwan3track")" ]; then
  13                 rm -rf "/var/run/mwan3track"
  14         fi
  15         exit 0
  16 }
  17
  18 main() {
  19         local reliability count timeout interval failure_interval
  20         local recovery_interval down up size
  21
  22         [ -z "$3" ] && echo "Error: should not be started manually" && exit 0
  23
  24         INTERFACE=$1
  25         echo "$$" > /var/run/mwan3track-$1.pid
  26         mkdir -p /var/run/mwan3track/$1
  27         trap clean_up SIGINT SIGTERM
  28
  29         config_load mwan3
  30         config_get reliability $1 reliability 1
  31         config_get count $1 count 1
  32         config_get timeout $1 timeout 4
  33         config_get interval $1 interval 10
  34         config_get down $1 down 5
  35         config_get up $1 up 5
  36         config_get size $1 size 56
  37         config_get failure_interval $1 failure_interval $interval
  38         config_get recovery_interval $1 recovery_interval $interval
  39
  40         local score=$(($down+$up))
  41         local track_ips=$(echo $* | cut -d ' ' -f 3-99)
  42         local host_up_count=0
  43         local lost=0
  44         local sleep_time=0
  45         local turn=0
  46
  47         echo "offline" > /var/run/mwan3track/$1/STATUS
  48         while true; do
  49
  50                 sleep_time=$interval
  51
  52                 for track_ip in $track_ips; do
  53                         ping -I $2 -c $count -W $timeout -s $size -q $track_ip &> /dev/null
  54                         if [ $? -eq 0 ]; then
  55                                 let host_up_count++
  56                                 echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip}
  57                         else
  58                                 let lost++
  59                                 echo "down" > /var/run/mwan3track/$1/TRACK_${track_ip}
  60                         fi
  61                 done
  62
  63                 if [ $host_up_count -lt $reliability ]; then
  64                         let score--
  65
  66                         if [ $score -lt $up ]; then
  67                                 score=0
  68                         else
  69                                 sleep_time=$failure_interval
  70                         fi
  71
  72                         if [ $score -eq $up ]; then
  73                                 echo "offline" > /var/run/mwan3track/$1/STATUS
  74                                 $LOG notice "Interface $1 ($2) is offline"
  75                                 env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
  76                                 score=0
  77                         fi
  78                 else
  79                         if [ $score -lt $(($down+$up)) ] && [ $lost -gt 0 ]; then
  80                                 $LOG info "Lost $(($lost*$count)) ping(s) on interface $1 ($2)"
  81                         fi
  82
  83                         let score++
  84                         lost=0
  85
  86                         if [ $score -gt $up ]; then
  87                                 echo "online" > /var/run/mwan3track/$1/STATUS
  88                                 score=$(($down+$up))
  89                         elif [ $score -le $up ]; then
  90                                 sleep_time=$recovery_interval
  91                         fi
  92
  93                         if [ $score -eq $up ]; then
  94                                 $LOG notice "Interface $1 ($2) is online"
  95                                 env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
  96                                 rm /var/run/mwan3track-$1.pid
  97                                 rm -rf "/var/run/mwan3track/${1}" &> /dev/null
  98                                 exit 0
  99                         fi
 100                 fi
 101
 102                 let turn++
 103                 echo "${lost}" > /var/run/mwan3track/$1/LOST
 104                 echo "${score}" > /var/run/mwan3track/$1/SCORE
 105                 echo "${turn}" > /var/run/mwan3track/$1/TURN
 106
 107                 host_up_count=0
 108                 sleep $sleep_time
 109         done
 110 }
 111
 112 main "$@"