zerotier: add initial package

Signed-off-by: Moritz Warning <moritzwarning@web.de>

net/zerotier/files/zerotier.config

@@ -0,0 +1,7 @@
+
+config zerotier sample_config
+	option enabled 1
+	option interface 'wan' # restart ZT when wan status changed
+	#option port '9993'
+	option secret 'generate' # generate secret on first start
+	list join '8056c2e21c000001' # a public network called Earth

net/zerotier/files/zerotier.init

@@ -0,0 +1,71 @@
+#!/bin/sh /etc/rc.common
+
+START=90
+
+USE_PROCD=1
+
+LIST_SEP="
+"
+ZT_COMMAND=/usr/bin/zerotier-one
+
+section_enabled() {
+	config_get_bool enabled "$1" 'enabled' 0
+	[ $enabled -gt 0 ]
+}
+
+start_instance() {
+	local cfg="$1"
+	local port secret interface
+	local ARGS=""
+
+	section_enabled "$cfg" || return 1
+
+	mkdir -p /var/lib/zerotier-one/networks.d/
+
+	config_get_bool port $cfg 'port'
+	config_get secret $cfg 'secret'
+	config_get interface $cfg 'interface'
+
+	if [ -n "$port" ]; then
+		ARGS="$ARGS -p$port"
+	fi
+
+	if [ "$secret" = "generate" ]; then
+		echo "Generate secret - please wait..."
+		local tmp="/tmp/zt.$cfg.secret"
+		zerotier-idtool generate "$tmp" > /dev/null
+		secret="$(cat $tmp)"
+		rm "$tmp"
+
+		uci set zerotier.$cfg.secret="$secret"
+		uci commit zerotier
+	fi
+
+	if [ -n "$secret" ]; then
+		echo "$secret" > /var/lib/zerotier-one/identity.secret
+		#make sure there is not previous dentity.public
+		rm -f /var/lib/zerotier-one/identity.public
+	fi
+
+	add_join() {
+		#an (empty) config file will cause ZT to join a network
+		touch /var/lib/zerotier-one/networks.d/$1.conf
+	}
+
+	config_list_foreach $cfg 'join' add_join
+
+	procd_open_instance
+	procd_add_reload_interface_trigger "$interface"
+	procd_set_param command $ZT_COMMAND $ARGS
+	procd_set_param nice -10
+	procd_close_instance
+}
+
+service_triggers() {
+       procd_add_reload_trigger zerotier
+}
+
+start_service() {
+	config_load 'zerotier'
+	config_foreach start_instance 'zerotier'
+}