zerotier: fix multiple instance handling and port setting

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

net/zerotier/files/etc/config/zerotier

@@ -0,0 +1,15 @@
+
+config zerotier sample_config
+	option enabled 0
+
+	# persistent configuration folder (for ZT controller mode)
+	#option config_path '/etc/zerotier'
+
+	#option port '9993'
+
+	# Generate secret on first start
+	option secret ''
+
+	# Join a public network called Earth
+	list join '8056c2e21c000001'
+	#list join '<other_network>'

net/zerotier/files/etc/init.d/zerotier

@@ -0,0 +1,103 @@
+#!/bin/sh /etc/rc.common
+
+START=90
+
+USE_PROCD=1
+
+PROG=/usr/bin/zerotier-one
+CONFIG_PATH=/var/lib/zerotier-one
+
+section_enabled() {
+	config_get_bool enabled "$1" 'enabled' 0
+	[ $enabled -ne 0 ]
+}
+
+start_instance() {
+	local cfg="$1"
+	local port secret config_path path
+	local args=""
+
+	if ! section_enabled "$cfg"; then
+		echo "disabled in config"
+		return 1
+	fi
+
+	config_get config_path $cfg 'config_path'
+	config_get port $cfg 'port'
+	config_get secret $cfg 'secret'
+
+	path=${CONFIG_PATH}_$cfg
+
+	# Remove existing link or folder
+	rm -rf $path
+
+	# Create link from CONFIG_PATH to config_path
+	if [ -n "$config_path" -a "$config_path" != "$path" ]; then
+		if [ ! -d "$config_path" ]; then
+			echo "ZeroTier config_path does not exist: $config_path" 1>&2
+			return
+		fi
+
+		ln -s $config_path $path
+	fi
+
+	mkdir -p $path/networks.d
+
+	# link latest default config path to latest config path
+	rm -f $CONFIG_PATH
+	ln -s $path $CONFIG_PATH
+
+	if [ -n "$port" ]; then
+		args="$args -p${port}"
+	fi
+
+	if [ -z "$secret" ]; then
+		echo "Generate secret - please wait..."
+		local sf="/tmp/zt.$cfg.secret"
+
+		zerotier-idtool generate "$sf" > /dev/null
+		[ $? -ne 0 ] && return 1
+
+		secret="$(cat $sf)"
+		rm "$sf"
+
+		uci set zerotier.$cfg.secret="$secret"
+		uci commit zerotier
+	fi
+
+	if [ -n "$secret" ]; then
+		echo "$secret" > $path/identity.secret
+		# make sure there is not previous identity.public
+		rm -f $path/identity.public
+	fi
+
+	add_join() {
+		# an (empty) config file will cause ZT to join a network
+		touch $path/networks.d/$1.conf
+	}
+
+	config_list_foreach $cfg 'join' add_join
+
+	procd_open_instance
+	procd_set_param command $PROG $args $path
+	procd_set_param stderr 1
+	procd_close_instance
+}
+
+start_service() {
+	config_load 'zerotier'
+	config_foreach start_instance 'zerotier'
+}
+
+stop_instance() {
+	local cfg="$1"
+
+	# Remove existing link or folder
+	rm -rf ${CONFIG_PATH}_${cfg}
+}
+
+stop_service() {
+	config_load 'zerotier'
+	config_foreach stop_instance 'zerotier'
+	rm -f ${CONFIG_PATH}
+}