#!/bin/sh . /lib/functions.sh . /lib/mwan3/common.sh LOG="logger -t $(basename "$0")[$$] -p" INTERFACE="" DEVICE="" IFDOWN_EVENT=0 clean_up() { $LOG notice "Stopping mwan3track for interface \"${INTERFACE}\"" exit 0 } if_down() { $LOG info "Detect ifdown event on interface ${INTERFACE} (${DEVICE})" IFDOWN_EVENT=1 } validate_track_method() { case "$1" in ping) which ping 1>/dev/null 2>&1 || { $LOG warn "Missing ping. Please install iputils-ping package or enable ping util and recompile busybox." return 1 } ;; arping) which arping 1>/dev/null 2>&1 || { $LOG warn "Missing arping. Please install iputils-arping package." return 1 } ;; httping) which httping 1>/dev/null 2>&1 || { $LOG warn "Missing httping. Please install httping package." return 1 } [ -n "$2" -a "$2" != "0.0.0.0" -a "$2" != "::" ] || { $LOG warn "Cannot determine source IP for the interface which is required by httping." return 1 } ;; *) $LOG warn "Unsupported tracking method: $track_method" return 2 ;; esac } main() { local reliability count timeout interval failure_interval local recovery_interval down up size local keep_failure_interval check_quality failure_latency local recovery_latency failure_loss recovery_loss [ -z "$5" ] && echo "Error: should not be started manually" && exit 0 INTERFACE=$1 DEVICE=$2 STATUS=$3 SRC_IP=$4 mkdir -p /var/run/mwan3track/$1 trap clean_up TERM trap if_down USR1 config_load mwan3 config_get track_method $1 track_method ping validate_track_method $track_method $SRC_IP || { track_method=ping if validate_track_method $track_method; then $LOG warn "Using ping to track interface $INTERFACE avaliability" else $LOG err "No track method avaliable" exit 1 fi } config_get reliability $1 reliability 1 config_get count $1 count 1 config_get timeout $1 timeout 4 config_get interval $1 interval 10 config_get down $1 down 5 config_get up $1 up 5 config_get size $1 size 56 config_get failure_interval $1 failure_interval $interval config_get_bool keep_failure_interval $1 keep_failure_interval 0 config_get recovery_interval $1 recovery_interval $interval config_get_bool check_quality $1 check_quality 0 config_get failure_latency $1 failure_latency 1000 config_get recovery_latency $1 recovery_latency 500 config_get failure_loss $1 failure_loss 40 config_get recovery_loss $1 recovery_loss 10 local score=$(($down+$up)) local track_ips=$(echo $* | cut -d ' ' -f 5-99) local host_up_count=0 local lost=0 local sleep_time=0 local turn=0 local result local ping_result local loss=0 local latency=0 if [ "$STATUS" = "unknown" ]; then echo "unknown" > /var/run/mwan3track/$1/STATUS score=0 else echo "online" > /var/run/mwan3track/$1/STATUS env -i ACTION="connected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface fi while true; do sleep_time=$interval for track_ip in $track_ips; do if [ $host_up_count -lt $reliability ]; then case "$track_method" in ping) if [ $check_quality -eq 0 ]; then ping -I $DEVICE -c $count -W $timeout -s $size -q $track_ip &> /dev/null result=$? else ping_result="$(ping -I $DEVICE -c $count -W $timeout -s $size -q $track_ip | tail -2)" loss="$(echo "$ping_result" | grep "packet loss" | cut -d "," -f3 | awk '{print $1}' | sed -e 's/%//')" if [ "$loss" -eq 100 ]; then latency=999999 else latency="$(echo "$ping_result" | grep -E 'rtt|round-trip' | cut -d "=" -f2 | cut -d "/" -f2 | cut -d "." -f1)" fi fi ;; arping) arping -I $DEVICE -c $count -w $timeout -q $track_ip &> /dev/null result=$? ;; httping) httping -y $SRC_IP -c $count -t $timeout -q $track_ip &> /dev/null result=$? ;; esac if [ $check_quality -eq 0 ]; then if [ $result -eq 0 ]; then let host_up_count++ echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip} if [ $score -le $up ]; then $LOG info "Check ($track_method) success for target \"$track_ip\" on interface $1 ($2)" fi else let lost++ echo "down" > /var/run/mwan3track/$1/TRACK_${track_ip} if [ $score -gt $up ]; then $LOG info "Check ($track_method) failed for target \"$track_ip\" on interface $1 ($2)" fi fi else if [ "$loss" -ge "$failure_loss" -o "$latency" -ge "$failure_latency" ]; then let lost++ echo "down" > /var/run/mwan3track/$1/TRACK_${track_ip} echo "$latency" > /var/run/mwan3track/$1/LATENCY_${track_ip} echo "$loss" > /var/run/mwan3track/$1/LOSS_${track_ip} if [ $score -gt $up ]; then $LOG info "Check (${track_method}: latency=${latency}ms loss=${loss}%) failed for target \"$track_ip\" on interface $1 ($2)" fi elif [ "$loss" -le "$recovery_loss" -a "$latency" -le "$recovery_latency" ]; then let host_up_count++ echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip} echo "$latency" > /var/run/mwan3track/$1/LATENCY_${track_ip} echo "$loss" > /var/run/mwan3track/$1/LOSS_${track_ip} if [ $score -le $up ]; then $LOG info "Check (${track_method}: latency=${latency}ms loss=${loss}%) success for target \"$track_ip\" on interface $1 ($2)" fi else echo "skipped" > /var/run/mwan3track/$1/TRACK_${track_ip} fi fi else echo "skipped" > /var/run/mwan3track/$1/TRACK_${track_ip} fi done if [ $host_up_count -lt $reliability ]; then let score-- if [ $score -lt $up ]; then score=0 [ ${keep_failure_interval} -eq 1 ] && { sleep_time=$failure_interval } else sleep_time=$failure_interval fi if [ $score -eq $up ]; then echo "offline" > /var/run/mwan3track/$1/STATUS $LOG notice "Interface $1 ($2) is offline" env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface env -i ACTION="disconnected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface score=0 fi else if [ $score -lt $(($down+$up)) ] && [ $lost -gt 0 ]; then $LOG info "Lost $(($lost*$count)) ping(s) on interface $1 ($2)" fi let score++ lost=0 if [ $score -gt $up ]; then echo "online" > /var/run/mwan3track/$1/STATUS score=$(($down+$up)) elif [ $score -le $up ]; then sleep_time=$recovery_interval fi if [ $score -eq $up ]; then $LOG notice "Interface $1 ($2) is online" echo "online" > /var/run/mwan3track/$1/STATUS env -i ACTION=ifup INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface exit 0 fi fi let turn++ mkdir -p "/var/run/mwan3track/${1}" echo "${lost}" > /var/run/mwan3track/$1/LOST echo "${score}" > /var/run/mwan3track/$1/SCORE echo "${turn}" > /var/run/mwan3track/$1/TURN echo "$(get_uptime)" > /var/run/mwan3track/$1/TIME host_up_count=0 sleep "${sleep_time}" & wait if [ "${IFDOWN_EVENT}" -eq 1 ]; then score=0 echo "offline" > /var/run/mwan3track/$1/STATUS IFDOWN_EVENT=0 fi done } main "$@"