Add package fff-autoconfig-v4

With this package it is possible to automatically get an ipv4 address for the router

We use the decentralized communication over mqtt

Signed-off-by: Christian Dresel <freifunk@dresel.systems>

src/packages/fff/fff-autoconfig-v4/Makefile

@@ -0,0 +1,45 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=fff-autoconfig-v4
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/fff-autoconfig-v4
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/fff-autoconfig-v4
+	SECTION:=base
+	CATEGORY:=Freifunk
+	TITLE:=Freifunk-Franken layer3 automatic ipv4 configuration
+	URL:=https://www.freifunk-franken.de
+	DEPENDS:= \
+		+fff-ipv4snat \
+		+fff-layer3-config \
+		+fff-mqtt \
+		+jshn 
+
+endef
+
+define Package/fff-autoconfig-v4/description
+	This package load automatic ipv4 over mqtt
+endef
+
+define Build/Prepare
+	echo "all: " > $(PKG_BUILD_DIR)/Makefile
+endef
+
+define Build/Configure
+	# nothing
+endef
+
+define Build/Compile
+	# nothing
+endef
+
+define Package/fff-autoconfig-v4/install
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,fff-autoconfig-v4))
+
+

src/packages/fff/fff-autoconfig-v4/files/usr/lib/micron.d/fff-autov4

@@ -0,0 +1 @@
+*/5 * * * * /usr/sbin/autov4

src/packages/fff/fff-autoconfig-v4/files/usr/sbin/autov4

@@ -0,0 +1,73 @@
+#!/bin/sh
+
+# first check is fff.autol3.ipv4 enabled
+if [ -z $(uci -q get fff.autol3.ipv4) ] ; then
+        exit;
+fi
+
+. /usr/share/libubox/jshn.sh
+
+MACADDR=$(cat /sys/class/net/br-client/address | /bin/sed 's/://g')
+MQTTSERVER=$(uci -q get fff.mqtt.server)
+ASSIGNEROWN=$(uci -q get fff.autol3.ipv4assigner)
+IPOWN=$(uci -q get fff.autol3.ipv4address)
+
+asknew() {
+	# Load Blocklist
+	ipv6assignerblock=$(uci get fff.autol3.ipv6assignerblock)
+	for ipv6assignerblock in $ipv6assignerblock; do
+	        block="$block -T  /ipv6/usethis/+/$ipv6assignerblock"  
+	done 
+        mosquitto_pub -h $MQTTSERVER -p 1883 -t '/ipv4/asknew' -m "$MACADDR"
+        # use the first income message
+        # cancel after 5 second, after this time we don't get any IP address
+        autol3config=$(mosquitto_sub -h $MQTTSERVER -p 1883 -t '/ipv4/usethis/#' -C 1 $block)
+        if [ -z "$autol3config" ] ; then
+                echo "No IP get"
+                exit 1;
+        fi
+        json_load "$autol3config"
+        json_get_var assigner assigner
+        json_get_var ip ip
+	ip=$(echo $ip | sed 's/\/.*//')
+        uci set fff.autol3.ipv4address=$ip
+        uci set fff.autol3.ipv4assigner=$assigner
+        uci commit fff
+        uci del gateway.meta.peer_ip
+	uci del gateway.@client[0].nat
+	uci del gateway.@client[0].ipaddr
+	uci del gateway.@client[0].dhcp_start
+        uci set gateway.meta.peer_ip=$ip
+	uci set gateway.@client[0].nat='1'
+	uci set gateway.@client[0].ipaddr='192.168.0.1/16'
+	uci set gateway.@client[0].dhcp_start='192.168.1.1'
+        uci commit gateway
+        yes | configure-layer3 -c
+        configure-layer3 -a
+        exit;
+}
+
+canusethis() {
+        mosquitto_pub -h $MQTTSERVER -p 1883 -t /ipv4/canusethis/$ASSIGNEROWN -m "{ \"mac\":\"$MACADDR\", \"ip\":\"$IPOWN/32\" }"
+        canusethisanswer=$(mosquitto_sub -h $MQTTSERVER -p 1883 -t /ipv4/canusethisanswer/$MACADDR -C 1 -W 5)
+        # check if we get answer, if no load asknew again and get new ip address
+        if [ -z $canusethisanswer ] ; then
+                uci del fff.autol3.ipv4address
+                uci del fff.autol3.ipv4assigner
+                uci commit fff
+                asknew
+        fi
+}
+
+if [ -z $(uci -q get fff.autol3) ] ; then
+        uci set fff.autol3=autol3
+fi
+
+if [ -n $(uci -q get fff.autol3) ] && [ -z $(uci -q get fff.autol3.ipv4address) ] ; then
+        asknew
+fi
+
+if [ -n $(uci -q get fff.autol3.ipv4address) ] ; then
+        canusethis
+fi
+

src/packages/fff/fff-layer3/Makefile

@@ -13,6 +13,7 @@ define Package/fff-layer3
 	TITLE:=Freifunk-Franken gateway configuration
 	URL:=https://www.freifunk-franken.de
 	DEPENDS:=+fff-alfred-monitoring-proxy \
+	         +fff-autoconfig-v4 \
 	         +fff-babeld \
 	         +fff-boardname \
 	         +fff-dhcp \