net/mwan3/files/usr/sbin/mwan3track

   1 #!/bin/sh
   2
   3 . /lib/functions.sh
   4
   5 LOG="logger -t $(basename "$0")[$$] -p"
   6 INTERFACE=""
   7 DEVICE=""
   8
   9 IFDOWN_EVENT=0
  10
  11 clean_up() {
  12         $LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
  13         if [ "$(pgrep -f "mwan3track ${INTERFACE}")" = "" ]; then
  14                 rm -rf "/var/run/mwan3track/${INTERFACE}" &> /dev/null
  15         fi
  16         if [ -z "$(ls -A "/var/run/mwan3track")" ]; then
  17                 rm -rf "/var/run/mwan3track"
  18         fi
  19         exit 0
  20 }
  21
  22 if_down() {
  23         $LOG info "Detect ifdown event on interface ${INTERFACE} (${DEVICE})"
  24         IFDOWN_EVENT=1
  25 }
  26
  27 main() {
  28         local reliability count timeout interval failure_interval
  29         local recovery_interval down up size
  30
  31         [ -z "$3" ] && echo "Error: should not be started manually" && exit 0
  32
  33         INTERFACE=$1
  34         DEVICE=$2
  35         mkdir -p /var/run/mwan3track/$1
  36         trap clean_up SIGINT SIGTERM
  37         trap if_down SIGUSR1
  38
  39         config_load mwan3
  40         config_get reliability $1 reliability 1
  41         config_get count $1 count 1
  42         config_get timeout $1 timeout 4
  43         config_get interval $1 interval 10
  44         config_get down $1 down 5
  45         config_get up $1 up 5
  46         config_get size $1 size 56
  47         config_get failure_interval $1 failure_interval $interval
  48         config_get recovery_interval $1 recovery_interval $interval
  49
  50         local score=$(($down+$up))
  51         local track_ips=$(echo $* | cut -d ' ' -f 3-99)
  52         local host_up_count=0
  53         local lost=0
  54         local sleep_time=0
  55         local turn=0
  56
  57         echo "offline" > /var/run/mwan3track/$1/STATUS
  58         while true; do
  59
  60                 sleep_time=$interval
  61
  62                 for track_ip in $track_ips; do
  63                         ping -I $2 -c $count -W $timeout -s $size -q $track_ip &> /dev/null
  64                         if [ $? -eq 0 ]; then
  65                                 let host_up_count++
  66                                 echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip}
  67                         else
  68                                 let lost++
  69                                 echo "down" > /var/run/mwan3track/$1/TRACK_${track_ip}
  70                         fi
  71                 done
  72
  73                 if [ $host_up_count -lt $reliability ]; then
  74                         let score--
  75
  76                         if [ $score -lt $up ]; then
  77                                 score=0
  78                         else
  79                                 sleep_time=$failure_interval
  80                         fi
  81
  82                         if [ $score -eq $up ]; then
  83                                 echo "offline" > /var/run/mwan3track/$1/STATUS
  84                                 $LOG notice "Interface $1 ($2) is offline"
  85                                 env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
  86                                 score=0
  87                         fi
  88                 else
  89                         if [ $score -lt $(($down+$up)) ] && [ $lost -gt 0 ]; then
  90                                 $LOG info "Lost $(($lost*$count)) ping(s) on interface $1 ($2)"
  91                         fi
  92
  93                         let score++
  94                         lost=0
  95
  96                         if [ $score -gt $up ]; then
  97                                 echo "online" > /var/run/mwan3track/$1/STATUS
  98                                 score=$(($down+$up))
  99                         elif [ $score -le $up ]; then
 100                                 sleep_time=$recovery_interval
 101                         fi
 102
 103                         if [ $score -eq $up ]; then
 104                                 $LOG notice "Interface $1 ($2) is online"
 105                                 env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
 106                                 rm -rf "/var/run/mwan3track/${1}" &> /dev/null
 107                                 exit 0
 108                         fi
 109                 fi
 110
 111                 let turn++
 112                 mkdir -p "/var/run/mwan3track/${1}"
 113                 echo "${lost}" > /var/run/mwan3track/$1/LOST
 114                 echo "${score}" > /var/run/mwan3track/$1/SCORE
 115                 echo "${turn}" > /var/run/mwan3track/$1/TURN
 116
 117                 host_up_count=0
 118                 sleep "${sleep_time}" &
 119                 wait
 120
 121                 if [ "${IFDOWN_EVENT}" -eq 1 ]; then
 122                         score=0
 123                         echo "offline" > /var/run/mwan3track/$1/STATUS
 124                         IFDOWN_EVENT=0
 125                 fi
 126         done
 127 }
 128
 129 main "$@"