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mwan3: support various interface tracking methods

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Adds support for interface tracking using either ping, arping or
httping. This allows to track interface status on networks with filtered
ICMP traffic or simply to monitor data link layer etc.

To facilitate binding to a specified interface its IP address is passed
as a new mwan3track parameter. It's currently required by httping
and possibly by other tools that may be added in the future.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
This commit is contained in:
Marcin Jurkowski
2017-07-25 19:34:40 +02:00
parent df1f3a41c8
commit de4fc2b5de
4 changed files with 46 additions and 6 deletions
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net/mwan3/files/usr/sbin/mwan3track
+38 -2
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@@ -24,6 +24,30 @@ if_down() {
IFDOWN_EVENT=1
}
validate_track_method() {
case "$1" in
ping)
# Assume that ping is installed
;;
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
}
;;
*)
$LOG warn "Unsupported tracking method: $track_method"
return 2
;;
esac
}
main() {
local reliability count timeout interval failure_interval
local recovery_interval down up size
@@ -37,6 +61,11 @@ main() {
trap if_down SIGUSR1
config_load mwan3
config_get track_method $1 track_method ping
validate_track_method $track_method || {
$LOG warn "Using ping to track interface $INTERFACE avaliability"
track_method=ping
}
config_get reliability $1 reliability 1
config_get count $1 count 1
config_get timeout $1 timeout 4
@@ -48,7 +77,7 @@ main() {
config_get recovery_interval $1 recovery_interval $interval
local score=$(($down+$up))
local track_ips=$(echo $* | cut -d ' ' -f 3-99)
local track_ips=$(echo $* | cut -d ' ' -f 4-99)
local host_up_count=0
local lost=0
local sleep_time=0
@@ -60,7 +89,14 @@ main() {
sleep_time=$interval
for track_ip in $track_ips; do
ping -I $2 -c $count -W $timeout -s $size -q $track_ip &> /dev/null
case "$track_method" in
ping)
ping -I $2 -c $count -W $timeout -s $size -q $track_ip &> /dev/null ;;
arping)
arping -I $2 -c $count -w $timeout -q $track_ip &> /dev/null ;;
httping)
httping -y $3 -c $count -t $timeout -q $track_ip &> /dev/null ;;
esac
if [ $? -eq 0 ]; then
let host_up_count++
echo "up" > /var/run/mwan3track/$1/TRACK_${track_ip}