add sentinel

files/all/etc/init.d/wifi-sentinel

@@ -0,0 +1,34 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2014 OpenWrt.org
+
+NAME=wifi-sentinel
+START=95
+
+SENTINEL_BIN=/usr/bin/${NAME}.sh
+
+USE_PROCD=1
+
+start_instance() {
+       local cfg="$1"
+       local packets interval network
+
+       config_get packets "$cfg" "packets"
+       config_get interval "$cfg" "interval"
+       config_get network "$cfg" "network"
+
+       procd_open_instance
+
+       procd_set_param command "${SENTINEL_BIN}"
+       procd_set_param respawn
+       procd_set_param env PACKETS=$packets INTERVAL=$interval NETWORK=$network
+
+       procd_add_reload_interface_trigger $interface
+       procd_add_reload_trigger "${NAME}"
+
+       procd_close_instance
+}
+
+start_service() {
+       config_load ${NAME}
+       config_foreach start_instance ${NAME}
+}

files/all/usr/sbin/wifi-sentinel.sh

@@ -0,0 +1,59 @@
+#!/bin/sh
+. /lib/functions/network.sh
+
+PACKETS='3'
+INTERVAL='10'
+STATUS='unknown'
+NETWORK='management'
+PORT='1'
+
+lightsoff()
+{
+    if [ "$STATUS" != 'down' ]; then
+        /usr/bin/logger -t wifi-sentinel -p daemon.alert Shutting down wireless interfaces due to lack of connectivity to the gateway.
+        /sbin/wifi down
+        STATUS='down'
+    fi
+}
+
+lightson()
+{
+    if [ "$STATUS" != 'up' ]; then
+        /usr/bin/logger -t wifi-sentinel -p daemon.notice Bringing up wireless interfaces. Gateway connectivity restored.
+        /sbin/wifi up
+        STATUS='up'
+    fi
+}
+
+port_check()
+{
+    LINK=`swconfig dev switch0 port 1 show | awk '/link/ {print $3}'`
+    if [ "$LINK" = 'link:up' ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+ping_check()
+{
+    local target
+    network_get_gateway target $NETWORK
+    RET=`ping -c $PACKETS $target 2> /dev/null | awk '/packets received/ {print $4}'`
+    if [ "$RET" -eq "$PACKETS" ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+/usr/bin/logger -t wifi-sentinel -p daemon.info "Starting Wi-Fi Sentinel on the $NETWORK network with $PACKETS checks every $INTERVAL seconds."
+
+while true ; do
+    if port_check && ping_check; then
+        lightson
+    else
+        lightsoff
+    fi
+    sleep $INTERVAL
+done