Add ability to run arbitrary commands on IP/DNS config

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Makefile

@@ -25,6 +25,10 @@ define Package/phantap
   DEPENDS:=+ebtables +tcpdump +ip-full +kmod-br-netfilter +kmod-ebtables-ipv4
 endef
 
+define Package/phantap/conffiles
+/etc/config/phantap
+endef
+
 define Package/phantap/description
   PhanTap or Phantom tap is a small set of scripts that allow you to setup a network tap
   that automatically impersonnate a victim device, allowing you to access internet using
@@ -48,6 +52,8 @@ define Build/Prepare
 endef
 
 define Package/phantap/install
+	$(INSTALL_DIR) $(1)/etc/config
+	$(INSTALL_DATA) ./files/etc/config/phantap $(1)/etc/config/phantap
 	$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
 	$(INSTALL_DATA) ./files/etc/hotplug.d/iface/00-phantap $(1)/etc/hotplug.d/iface/00-phantap
 	$(INSTALL_DIR) $(1)/etc/hotplug.d/net

files/etc/config/phantap

@@ -0,0 +1,5 @@
+
+config phantap 'main'
+	#list onnetconfig '/etc/init.d/openvpn restart'
+	#list ondnsconfig '/etc/init.d/myservice restart'
+

files/usr/bin/phantap

@@ -1,5 +1,6 @@
 #!/bin/sh
 
+. /lib/functions.sh
 . /lib/functions/network.sh
 
 INTF=phantap
@@ -66,6 +67,14 @@ mv /tmp/phantap.firewall.$$ /tmp/phantap.firewall
 ebtables -t filter -A phantap-drop -j DROP
 /etc/init.d/firewall reload
 
+handle_onconfig() {
+    /bin/sh -c "$1" || echo "'$1' failed"
+}
+
+config_load phantap
+# Run all commands in onnetconfig list
+config_list_foreach main onnetconfig handle_onconfig
+
 while true; do
     # uses tcpdump to grab dns traffic
     echo "Listening to traffic for dns config ..."
@@ -86,6 +95,8 @@ done
 
 echo "nameserver $dns_ip" > /tmp/resolv.conf
 
+# Run all commands in ondnsconfig list
+config_list_foreach main ondnsconfig handle_onconfig
+
 echo "setup done, you now have access to internet"
 
-# restart openvpn