Initial import
This commit is contained in:
commit
73cd11d943
9
install.sh
Executable file
9
install.sh
Executable file
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#!/bin/sh
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mkdir -p /etc/config /etc/init.d /usr/sbin
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[ -f /etc/config/wan-failover ] || cp -a wan-failover.config /etc/config/wan-failover
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cp -a wan-failover.init.d /etc/init.d/wan-failover
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cp -a wan-failover /usr/sbin/wan-failover
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chmod +x /etc/init.d/wan-failover /usr/sbin/wan-failover
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ln -sf ../init.d/wan-failover /etc/rc.d/S99wan-failover
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ln -sf ../init.d/wan-failover /etc/rc.d/K85wan-failover
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221
wan-failover
Executable file
221
wan-failover
Executable file
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#!/bin/sh
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#
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# Copyright (c) Brian Tarricone <brian@tarricone.org>
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# Released under the terms of the BSD 3-clause license.
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# See https://opensource.org/licenses/BSD-3-Clause for details.
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set -e
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default_check_interval=5
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default_health_ips="8.8.8.8 1.1.1.1"
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default_ping_count=5
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default_health_quorum=1
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default_up_successes=5
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default_down_failures=3
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default_active_metric=10
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default_inactive_metric=20
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log() {
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logger -t wan-failover -p daemon.notice "$1"
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}
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dlog() {
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if [ "$debug" ]; then
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logger -t wan-failover -p daemon.debug "$1"
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fi
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}
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elog() {
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logger -t wan-failover -p daemon.err "$1"
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}
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cfg() {
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uci get "$1" 2>/dev/null
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}
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cfg_set() {
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uci set "$1"="$2"
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}
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cfg_commit() {
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uci commit "$1"
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}
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ourcfg() {
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cfg "wan-failover.$1"
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}
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cfg_init() {
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[ "$(ourcfg globals.debug || echo 'false')" = "true" ] && debug=1 || debug=
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check_interval=$(ourcfg globals.check_interval || echo $default_check_interval)
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primary_iface=$(ourcfg globals.primary || echo '')
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primary_ifname=$(cfg network.$primary_iface.ifname || echo '')
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fallback_iface=$(ourcfg globals.fallback || echo '')
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fallback_ifname=$(cfg network.$fallback_iface.ifname || echo '')
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primary_health_ips=$(ourcfg $primary_iface.ip || echo $default_health_ips)
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primary_ping_count=$(ourcfg $primary_iface.count || echo $default_ping_count)
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primary_health_quorum=$(ourcfg $primary_iface.quorum || echo $default_health_quorum)
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primary_up_successes=$(ourcfg $primary_iface.up || echo $default_up_successes)
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primary_down_failures=$(ourcfg $primary_iface.down || echo $default_down_failures)
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fallback_health_ips=$(ourcfg $fallback_iface.ip || echo $default_health_ips)
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fallback_ping_count=$(ourcfg $fallback_iface.count || echo $default_ping_count)
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fallback_health_quorum=$(ourcfg $fallback_iface.quorum || echo $default_health_quorum)
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fallback_up_successes=$(ourcfg $fallback_iface.up || echo $default_up_successes)
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fallback_down_failures=$(ourcfg $fallback_iface.down || echo $default_down_failures)
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active_metric=$(ourcfg globals.active_metric || echo $default_active_metric)
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inactive_metric=$(ourcfg globals.inactive_metric || echo $default_inactive_metric)
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if [ -z "$primary_iface" ]; then
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elog "Must set wan-failover.globals.primary to the primary interface"
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exit 1
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fi
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if [ -z "$primary_ifname" ]; then
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elog "Can't figure out interface device name for interface $primary_iface" >&2
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exit 1
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fi
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if [ -z "$fallback_iface" ]; then
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elog "Must set wan-failover.globals.fallback to the fallback interface"
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exit 1
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fi
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if [ -z "$fallback_ifname" ]; then
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elog "Can't figure out interface device name for interface $fallback_iface" >&2
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exit 1
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fi
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log "initialized with primary interface $primary_iface ($primary_ifname), fallback interface $fallback_iface ($fallback_ifname); will wait $check_interval second(s) between each check"
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log "will check primary using $primary_health_ips ($primary_health_quorum must work) with $primary_ping_count ping(s), and will require $primary_up_successes successes to be up, $primary_down_failures to be down"
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log "will check fallback using $fallback_health_ips ($fallback_health_quorum must work) with $fallback_ping_count ping(s), and will require $fallback_up_successes successes to be up, $fallback_down_failures to be down"
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log "active interface metric will be set to $active_metric, inactive to $inactive_metric"
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}
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get_active_iface() {
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local primary=$(cfg network.$primary_iface.metric)
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local fallback=$(cfg network.$fallback_iface.metric)
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dlog "current primary metric is $primary, fallback metric is $fallback"
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[ $primary -gt $fallback ] && echo $fallback_iface || echo $primary_iface
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}
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set_active_iface() {
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local active=$1
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local inactive=$2
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dlog "setting interface $active active, $inactive inactive"
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cfg_set network.$active.metric $active_metric
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cfg_set network.$inactive.metric $inactive_metric
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cfg_commit network
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/etc/init.d/network reload
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}
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ping_target() {
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local ifname=$1
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local count=$2
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local ip=$3
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echo "$ip" | grep -q ':' && ping=ping6 || ping=ping
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local successes=0
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local failures=0
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while [ $count -gt 0 ]; do
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dlog "[$ifname,$ip] ping"
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$ping -n -q -I $ifname -c 1 -w 2 $ip >/dev/null 2>&1 &&
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successes=$(expr $successes + 1) ||
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failures=$(expr $failures + 1)
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dlog "[$ifname,$ip] ping successes: $successes, failures: $failures"
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count=$(expr $count - 1 || true)
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done
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[ $successes -gt $failures ] && return 0 || return 1
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}
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check_health() {
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local ifname=$1
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shift
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local count=$1
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shift
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local quorum=$1
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shift
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local ips="$@"
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local pids=
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local ip
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for ip in $ips; do
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ping_target $ifname $count $ip &
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pids="$pids $!"
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done
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local successes=0
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local failures=0
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local pid
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for pid in $pids; do
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wait $pid && {
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dlog "[$pid] got success"
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successes=$(expr $successes + 1)
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} || {
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dlog "[$pid] got failure"
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failures=$(expr $failures + 1)
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}
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done
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[ $successes -ge $quorum ] && return 0 || return 1
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}
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cfg_init
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primary_successes=0
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primary_failures=0
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fallback_failures=0
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fallback_successes=0
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while true; do
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sleep $check_interval
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active=$(get_active_iface)
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dlog "currently active: $active"
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dlog "checking health"
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check_health $primary_ifname $primary_ping_count $primary_health_quorum $primary_health_ips &
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primary_pid=$!
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check_health $fallback_ifname $fallback_ping_count $fallback_health_quorum $fallback_health_ips &
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fallback_pid=$!
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wait $primary_pid && {
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primary_successes=$(expr $primary_successes + 1)
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primary_failures=0
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} || {
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primary_successes=0
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primary_failures=$(expr $primary_failures + 1)
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}
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dlog "[$primary_iface] health check done; successes: $primary_successes, failures: $primary_failures"
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wait $fallback_pid && {
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fallback_successes=$(expr $fallback_successes + 1)
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fallback_failures=0
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} || {
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fallback_successes=0
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fallback_failures=$(expr $fallback_failures + 1)
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}
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dlog "[$fallback_iface] health check done; successes: $fallback_successes, failures: $fallback_failures"
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if [ "$active" = "$primary_iface" ]; then
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if [ $primary_failures -ge $primary_down_failures ]; then
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if [ $fallback_failures -ge $fallback_down_failures ]; then
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elog "primary is down, but fallback is as well"
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else
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log "$primary_iface is down, setting $fallback_iface active"
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set_active_iface $fallback_iface $primary_iface
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fi
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fi
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else
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if [ $primary_successes -ge $primary_up_successes ]; then
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log "$primary_iface is back up; setting active"
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set_active_iface $primary_iface $fallback_iface
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elif [ $primary_successes -gt 0 ]; then
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dlog "$primary_iface is coming back up; sticking with $fallback_iface until certain"
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else
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dlog "$primary_iface is still down; sticking with $fallback_iface"
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fi
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fi
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done
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27
wan-failover.config
Normal file
27
wan-failover.config
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config globals 'globals'
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option primary 'wan'
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option fallback 'wwan'
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option check_interval 10
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option debug 'false'
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config interface 'wan'
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list ip '8.8.8.8'
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list ip '1.1.1.1'
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list ip '2001:4860:4860::8888'
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list ip '2606:4700:4700::1112'
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option quorum '2'
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option count '5'
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option timeout '2'
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option down '3'
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option up '5'
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config interface 'wwan'
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list ip '8.8.8.8'
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list ip '1.1.1.1'
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# list ip '2001:4860:4860::8888'
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# list ip '2606:4700:4700::1112'
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option quorum '2'
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option count '5'
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option timeout '2'
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option down '3'
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option up '5'
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31
wan-failover.init.d
Executable file
31
wan-failover.init.d
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#!/bin/sh /etc/rc.common
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#
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# Copyright (c) Brian Tarricone <brian@tarricone.org>
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# Released under the terms of the BSD 3-clause license.
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# See https://opensource.org/licenses/BSD-3-Clause for details.
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START=99
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USE_PROCD=1
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PROG=/usr/sbin/wan-failover
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reload_service() {
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json_init
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json_add_array interfaces
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for i in $(load_ifaces); do
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json_add_string "" "$i"
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done
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json_close_array
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ubus call umdns set_config "$(json_dump)"
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}
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start_service() {
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procd_open_instance
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procd_set_param command "$PROG"
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procd_set_param respawn
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procd_open_trigger
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procd_add_config_trigger "config.change" "wan-failover" /etc/init.d/wan-failover restart
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procd_close_trigger
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procd_close_instance
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}
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