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#!/bin/sh
. /lib/functions.sh
. /lib/functions/network.sh
. /lib/mwan3/common.sh
INTERFACE=""
DEVICE=""
IFDOWN_EVENT=0
IFUP_EVENT=0
stop_subprocs() {
[ -n "$SLEEP_PID" ] && kill "$SLEEP_PID" && unset SLEEP_PID
[ -n "$TRACK_PID" ] && kill "$TRACK_PID" && unset TRACK_PID
}
WRAP() {
# shellcheck disable=SC2048
FAMILY=$FAMILY DEVICE=$DEVICE SRCIP=$SRC_IP FWMARK=$MMX_DEFAULT LD_PRELOAD=/lib/mwan3/libwrap_mwan3_sockopt.so.1.0 $*
}
clean_up() {
LOG notice "Stopping mwan3track for interface \"${INTERFACE}\". Status was \"${STATUS}\""
stop_subprocs
exit 0
}
if_down() {
LOG info "Detect ifdown event on interface ${INTERFACE} (${DEVICE})"
IFDOWN_EVENT=1
stop_subprocs
}
if_up() {
LOG info "Detect ifup event on interface ${INTERFACE} (${DEVICE})"
IFDOWN_EVENT=0
IFUP_EVENT=1
STARTED=1
stop_subprocs
}
ping_test_host() {
if [ "$FAMILY" = "ipv6" ]; then
echo "::1"
else
echo "127.0.0.1"
fi
}
get_ping_command() {
if [ -x "/usr/bin/ping" ] && /usr/bin/ping -${FAMILY#ipv} -c1 -q $(ping_test_host) &>/dev/null; then
# -4 option added in iputils c3e68ac6 so need to check if we can use it
# or if we must use ping and ping6
echo "/usr/bin/ping -${FAMILY#ipv}"
elif [ "$FAMILY" = "ipv6" ] && [ -x "/usr/bin/ping6" ]; then
echo "/usr/bin/ping6"
elif [ "$FAMILY" = "ipv4" ] && [ -x "/usr/bin/ping" ]; then
echo "/usr/bin/ping"
elif [ -x "/bin/ping" ]; then
echo "/bin/ping -${FAMILY#ipv}"
else
return 1
fi
}
validate_track_method() {
case "$1" in
ping)
PING=$(get_ping_command)
if [ $? -ne 0 ]; then
LOG warn "Missing ping. Please enable BUSYBOX_DEFAULT_PING and recompile busybox or install iputils-ping package."
return 1
fi
;;
arping)
command -v arping 1>/dev/null 2>&1 || {
LOG warn "Missing arping. Please install iputils-arping package."
return 1
}
;;
httping)
command -v httping 1>/dev/null 2>&1 || {
LOG warn "Missing httping. Please install httping package."
return 1
}
;;
nping-*)
command -v nping 1>/dev/null 2>&1 || {
LOG warn "Missing nping. Please install nping package."
return 1
}
;;
*)
LOG warn "Unsupported tracking method: $track_method"
return 2
;;
esac
}
validate_wrap() {
[ -x /lib/mwan3/libwrap_mwan3_sockopt.so.1.0 ] && return
LOG error "Missing libwrap_mwan3_sockopt. Please reinstall mwan3." &&
exit 1
}
disconnected() {
STATUS='offline'
echo "offline" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/STATUS
get_uptime > $MWAN3TRACK_STATUS_DIR/$INTERFACE/OFFLINE
echo "0" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/ONLINE
score=0
[ "$1" = 1 ] && return
LOG notice "Interface $INTERFACE ($DEVICE) is offline"
env -i ACTION="disconnected" INTERFACE="$INTERFACE" DEVICE="$DEVICE" /sbin/hotplug-call iface
}
connected() {
STATUS='online'
echo "online" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/STATUS
echo "0" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/OFFLINE
get_uptime > $MWAN3TRACK_STATUS_DIR/$INTERFACE/ONLINE
host_up_count=0
lost=0
turn=0
loss=0
LOG notice "Interface $INTERFACE ($DEVICE) is online"
env -i FIRSTCONNECT=$1 ACTION="connected" INTERFACE="$INTERFACE" DEVICE="$DEVICE" /sbin/hotplug-call iface
}
disabled() {
STATUS='disabled'
echo "disabled" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/STATUS
STARTED=0
}
firstconnect() {
local true_iface
network_flush_cache
mwan3_get_true_iface true_iface $INTERFACE
network_get_device DEVICE $true_iface
if [ "$STATUS" != "online" ]; then
config_get STATUS $INTERFACE initial_state "online"
fi
if ! network_is_up $true_iface || [ -z "$DEVICE" ]; then
disabled
return
fi
mwan3_get_src_ip SRC_IP $INTERFACE
LOG debug "firstconnect: called on $INTERFACE/$true_iface ($DEVICE). Status is $STATUS. SRC_IP is $SRC_IP"
STARTED=1
if [ "$STATUS" = "offline" ]; then
disconnected 1
else
connected 1
fi
}
update_status() {
local track_ip=$1
echo "$2" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TRACK_${track_ip}
[ -z "$3" ] && return
echo "$3" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/LATENCY_${track_ip}
echo "$4" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/LOSS_${track_ip}
}
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
local max_ttl httping_ssl track_ips do_log
INTERFACE=$1
STATUS=""
STARTED=0
TRACK_OUTPUT=$MWAN3TRACK_STATUS_DIR/$INTERFACE/TRACK_OUTPUT
mwan3_init
mkdir -p $MWAN3TRACK_STATUS_DIR/$INTERFACE
trap clean_up TERM
trap if_down USR1
trap if_up USR2
config_load mwan3
config_get FAMILY $INTERFACE family ipv4
config_get track_method $INTERFACE track_method ping
config_get_bool httping_ssl $INTERFACE httping_ssl 0
validate_track_method $track_method || {
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 $INTERFACE reliability 1
config_get count $INTERFACE count 1
config_get timeout $INTERFACE timeout 4
config_get interval $INTERFACE interval 10
config_get down $INTERFACE down 5
config_get up $INTERFACE up 5
config_get size $INTERFACE size 56
config_get max_ttl $INTERFACE max_ttl 60
config_get failure_interval $INTERFACE failure_interval $interval
config_get_bool keep_failure_interval $INTERFACE keep_failure_interval 0
config_get recovery_interval $INTERFACE recovery_interval $interval
config_get_bool check_quality $INTERFACE check_quality 0
config_get failure_latency $INTERFACE failure_latency 1000
config_get recovery_latency $INTERFACE recovery_latency 500
config_get failure_loss $INTERFACE failure_loss 40
config_get recovery_loss $INTERFACE recovery_loss 10
local sleep_time result ping_status loss latency
mwan3_list_track_ips()
{
track_ips="$track_ips $1"
}
config_list_foreach "$1" track_ip mwan3_list_track_ips
local score=$((down+up))
local host_up_count=0
local lost=0
local turn=0
firstconnect
while true; do
[ $STARTED -eq 0 ] && { sleep $MAX_SLEEP & SLEEP_PID=$!; wait; }
unset SLEEP_PID
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
WRAP $PING -c $count -W $timeout -s $size -t $max_ttl -q $track_ip &> /dev/null &
TRACK_PID=$!
wait $TRACK_PID
result=$?
else
WRAP $PING -c $count -W $timeout -s $size -t $max_ttl -q $track_ip 2>/dev/null > $TRACK_OUTPUT &
TRACK_PID=$!
wait $TRACK_PID
ping_status=$?
loss="$(sed $TRACK_OUTPUT -ne 's/.*\([0-9]\+\)% packet loss.*/\1/p')"
if [ "$ping_status" -ne 0 ] || [ "$loss" -eq 100 ]; then
latency=999999
loss=100
else
latency="$(sed $TRACK_OUTPUT -ne 's%\(rtt\|round-trip\).* = [^/]*/\([0-9]\+\).*%\2%p')"
fi
fi
;;
arping)
WRAP arping -I $DEVICE -c $count -w $timeout -q $track_ip &> /dev/null &
TRACK_PID=$!
wait $TRACK_PID
result=$?
;;
httping)
if [ "$httping_ssl" -eq 1 ]; then
WRAP httping -c $count -t $timeout -q "https://$track_ip" &> /dev/null &
else
WRAP httping -c $count -t $timeout -q "http://$track_ip" &> /dev/null &
fi
TRACK_PID=$!
wait $TRACK_PID
result=$?
;;
nping-*)
WRAP nping -c $count $track_ip --${FAMILY#nping-} > $TRACK_OUTPUT &
TRACK_PID=$!
wait $TRACK_PID
result=$(grep $TRACK_OUTPUT Lost | awk '{print $12}')
;;
esac
do_log=""
if [ $check_quality -eq 0 ]; then
if [ $result -eq 0 ]; then
let host_up_count++
update_status "$track_ip" "up"
[ $score -le $up ] && do_log="success"
else
let lost++
update_status "$track_ip" "down"
[ $score -gt $up ] && do_log="failed"
fi
[ -n "$do_log" ] && LOG info "Check ($track_method) ${do_log} for target \"$track_ip\" on interface $INTERFACE ($DEVICE). Current score: $score"
else
if [ "$loss" -ge "$failure_loss" ] || [ "$latency" -ge "$failure_latency" ]; then
let lost++
update_status "$track_ip" "down" $latency $loss
[ $score -gt $up ] && do_log="failed"
elif [ "$loss" -le "$recovery_loss" ] && [ "$latency" -le "$recovery_latency" ]; then
let host_up_count++
update_status "$track_ip" "up" $latency $loss
[ $score -le $up ] && do_log="success"
else
echo "skipped" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TRACK_${track_ip}
fi
[ -n "$do_log" ] && LOG info "Check (${track_method}: latency=${latency}ms loss=${loss}%) ${do_log} for target \"$track_ip\" on interface $INTERFACE ($DEVICE). Current score: $score"
fi
else
echo "skipped" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/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
disconnected
score=0
fi
else
if [ $score -lt $((down+up)) ] && [ $lost -gt 0 ]; then
LOG info "Lost $((lost*count)) ping(s) on interface $INTERFACE ($DEVICE). Current score: $score"
fi
let score++
lost=0
if [ $score -gt $up ]; then
echo "online" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/STATUS
score=$((down+up))
elif [ $score -le $up ]; then
sleep_time=$recovery_interval
fi
if [ $score -eq $up ]; then
connected
fi
fi
let turn++
mkdir -p "$MWAN3TRACK_STATUS_DIR/${1}"
echo "${lost}" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/LOST
echo "${score}" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/SCORE
echo "${turn}" > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TURN
get_uptime > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TIME
host_up_count=0
if [ "${IFDOWN_EVENT}" -eq 0 ] && [ "${IFUP_EVENT}" -eq 0 ]; then
sleep "${sleep_time}" &
SLEEP_PID=$!
wait
unset SLEEP_PID
fi
if [ "${IFDOWN_EVENT}" -eq 1 ]; then
LOG debug "Register ifdown event on interface ${INTERFACE} (${DEVICE})"
disabled
disconnected
IFDOWN_EVENT=0
fi
if [ "${IFUP_EVENT}" -eq 1 ]; then
LOG debug "Register ifup event on interface ${INTERFACE} (${DEVICE})"
firstconnect
IFUP_EVENT=0
fi
done
}
main "$@"