Add packet lime-auto-ap-watchping

Provides a simple ICMP based whatching system which changes the AP SSID if the node does not have network connection.

Signed-off-by: p4u <p4u@dabax.net>

packages/lime-auto-ap-watchping/Makefile

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+# 
+# Copyright (C) 2016 Libre-Mesh.org
+#
+# This is free software, licensed under the GNU General Public License v3.
+#
+
+include $(TOPDIR)/rules.mk
+
+GIT_COMMIT_DATE:=$(shell git log -n 1 --pretty=%ad --date=short . )
+GIT_COMMIT_TSTAMP:=$(shell git log -n 1 --pretty=%at . )
+
+PKG_NAME:=lime-auto-ap-watchping
+PKG_VERSION=$(GIT_COMMIT_DATE)-$(GIT_COMMIT_TSTAMP)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/$(PKG_NAME)
+  TITLE:=Automatic AP failing ssid control based on watchping
+  SECTION:=lime
+  CATEGORY:=LiMe
+  MAINTAINER:=Pau Escrich <p4u@dabax.et>
+  URL:=http://libre-mesh.org
+  DEPENDS:=+watchping 
+endef
+
+define Package/$(PKG_NAME)/description
+	Watchping hooks and daemon for automatic AP ssid changing if network problems
+endef
+
+define Build/Compile
+endef
+
+define Package/$(PKG_NAME)/install
+	$(INSTALL_DIR) $(1)/
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,$(PKG_NAME)))

packages/lime-auto-ap-watchping/README

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+In MESH networks with high density of nodes, 
+if a single node is working wrong (bad channel, VLAN, random crash, etc.),
+as the AP SSID is always the same, the client devices attach to it 
+will keep trying to use it, but their network connection will be broken.
+
+Instead, lime-auto-ap-watchping provides a simple ICMP based whatching system
+which changes the AP SSID to let other nodes working handle the clients.
+By default the new SSID will be $HOSTNAME-down, so it will be easy to find and fix it if possible.
+Because of the layer2 batman-adv roaming feature included in libre-mesh,
+clients won't even notice the difference if there is another neighbour node which can handle them.
+
+There are two options available in lime.network config file:
+
+1. autoap_enabled: [1/0] turn on/off this feature 
+2. autoap_hosts: list of hosts used for whatchping, usually one or more backbone nodes of the network

packages/lime-auto-ap-watchping/files/etc/init.d/auto-ap

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+#!/bin/sh /etc/rc.common
+# Copyright (C) 2016 libre-mesh.org
+# This is free software, licensed under the GNU General Public License v3.
+
+START=99
+
+PIDFILE="/tmp/run/autoAP"
+
+load_autoAP() {
+	config_load lime
+	config_get enabled network autoap_enabled
+	config_get hosts network autoap_hosts
+	[ -z "$enabled" -o $enabled -eq 0 ] && {
+		echo "autoAP disabled in lime config"
+		exit 0
+	}
+	pinghosts=${hosts:-8.8.8.8 8.8.4.4}
+	timeout=120
+	pinginterval=20
+	interface=autoAP
+	/usr/bin/watchping none "$timeout" "$pinghosts" "$pinginterval" "$interface" 2>/tmp/autoAP.err.log &
+	[ $? -eq 0 ] && {
+		echo $! >> "${PIDFILE}"
+		echo "autoAP wathcping started"
+		logger -t autoAP "watchping started"
+	} || {
+		echo "error starting watchping"
+		logger -t autoAP "error starting watchping"
+	}
+}
+
+stop() {
+	[ -f "$PIDFILE" ] && {
+		kill -9 $(cat $PIDFILE)
+		rm -f "$PIDFILE"
+		logger -t autoAP "Stopped"
+	}
+}
+
+start() {
+	[ -f "$PIDFILE" ] && {
+		echo "Already started"
+		exit 1
+	}
+	load_autoAP
+}

packages/lime-auto-ap-watchping/files/etc/uci-defaults/91_autoAP

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+#!/bin/sh
+uci -q get lime.network.autoap_enabled || uci set lime.network.autoap_enabled=0
+uci -q get lime.network.autoap_hosts || uci set lime.network.autoap_hosts="8.8.8.8 8.8.4.4"
+exit 0

packages/lime-auto-ap-watchping/files/etc/watchping/autoAP-fail.d/auto-ap

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+#!/bin/sh
+FAIL_SSID_TEMPLATE="#hostname-down"
+TMP_DIR="/tmp/auto-ap"
+mkdir -p $TMP_DIR
+
+[ -f $TMP_DIR/autoAP.fail-state ] && echo "Already in fail state, doing nothing" && exit 0
+
+set_ap_fail() {
+  uci_url=$(echo $1 | cut -d= -f1)
+  ssid=$(echo $1 | cut -d= -f2 | tr -d \')
+  ap_name=$(echo $1 | cut -d. -f2)
+  # Save original SSID
+  echo $ssid > $TMP_DIR/$ap_name
+  # Set fail essid
+  fail_ssid=$(echo $FAIL_SSID_TEMPLATE | sed s/#hostname/$HOSTNAME/g)
+  uci set ${uci_url}=$fail_ssid
+  logger -t autoAP "Change AP ssid for $ap_name to $fail_ssid"
+}
+
+# Get ssid and uci url from APs                                             
+for ap in $(uci show wireless | egrep "lm_.*_ap_.*ssid")
+  do 
+    set_ap_fail $ap
+  done
+rm -f $TMP_DIR/autoAP.ok-state
+touch $TMP_DIR/autoAP.fail-state
+wifi

packages/lime-auto-ap-watchping/files/etc/watchping/autoAP-ok.d/auto-ap

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+#!/bin/sh
+TMP_DIR="/tmp/auto-ap"
+mkdir -p $TMP_DIR                                        
+
+[ -f $TMP_DIR/autoAP.ok-state ] && logger -t autoAP "Already in OK state, doing nothing" && exit 0
+
+set_ap_ok() {
+  uci_url=$(echo $1 | cut -d= -f1)
+  ssid=$(echo $1 | cut -d= -f2 | tr -d \')
+  ap_name=$(echo $1 | cut -d. -f2)
+
+  ssid=$(cat $TMP_DIR/$ap_name 2>/dev/null)
+  [ -z "$ssid" ] && return
+
+  # Set original essid
+  uci set ${uci_url}=$ssid
+  logger -t autoAP "Change AP ssid from $ap_name to $ssid"
+  rm -f $TMP_DIR/$ap_name
+}
+
+# Get original ssid and uci url                                      
+for ap in $(uci show wireless | egrep "lm_.*_ap_.*ssid" | cut -d= -f1)
+ do
+   set_ap_ok $ap
+ done
+
+# Apply changes
+rm -f $TMP_DIR/autoAP.fail-state  
+touch $TMP_DIR/autoAP.ok-state
+wifi