FEATURE: allow disabling private IPs

When forcing the internal IP to "" or "-", private IPs won't be used.

pkg/mesh/backend.go

@@ -51,9 +51,10 @@ const (
 
 // Node represents a node in the network.
 type Node struct {
-	Endpoint   *wireguard.Endpoint
-	Key        []byte
-	InternalIP *net.IPNet
+	Endpoint     *wireguard.Endpoint
+	Key          []byte
+	NoInternalIP bool
+	InternalIP   *net.IPNet
 	// LastSeen is a Unix time for the last time
 	// the node confirmed it was live.
 	LastSeen int64

pkg/mesh/mesh.go

@@ -371,7 +371,7 @@ func (m *Mesh) handleLocal(n *Node) {
 	if n.Endpoint == nil || (n.Endpoint.DNS == "" && n.Endpoint.IP == nil) {
 		n.Endpoint = &wireguard.Endpoint{DNSOrIP: wireguard.DNSOrIP{IP: m.externalIP.IP}, Port: m.port}
 	}
-	if n.InternalIP == nil {
+	if n.InternalIP == nil && !n.NoInternalIP {
 		n.InternalIP = m.internalIP
 	}
 	// Compare the given node to the calculated local node.
@@ -380,6 +380,7 @@ func (m *Mesh) handleLocal(n *Node) {
 	local := &Node{
 		Endpoint:            n.Endpoint,
 		Key:                 m.pub,
+		NoInternalIP:        n.NoInternalIP,
 		InternalIP:          n.InternalIP,
 		LastSeen:            time.Now().Unix(),
 		Leader:              n.Leader,

pkg/mesh/topology.go

@@ -83,6 +83,8 @@ func NewTopology(nodes map[string]*Node, peers map[string]*Peer, granularity Gra
 		switch granularity {
 		case LogicalGranularity:
 			location = logicalLocationPrefix + node.Location
+			// Put node in a different location, if no private
+			// IP was found.
 			if node.InternalIP == nil {
 				location = nodeLocationPrefix + node.Name
 			}