+ dhcpv6 server; rewrite dhcpv4 server; changed API

home/clients.go

@@ -86,6 +86,7 @@ type clientsContainer struct {
 }
 
 // Init initializes clients container
+// dhcpServer: optional
 // Note: this function must be called only once
 func (clients *clientsContainer) Init(objects []clientObject, dhcpServer *dhcpd.Server, autoHosts *util.AutoHosts) {
 	if clients.list != nil {
@@ -106,7 +107,9 @@ func (clients *clientsContainer) Init(objects []clientObject, dhcpServer *dhcpd.
 
 	if !clients.testing {
 		clients.addFromDHCP()
-		clients.dhcpServer.SetOnLeaseChanged(clients.onDHCPLeaseChanged)
+		if clients.dhcpServer != nil {
+			clients.dhcpServer.SetOnLeaseChanged(clients.onDHCPLeaseChanged)
+		}
 		clients.autoHosts.SetOnChanged(clients.onHostsChanged)
 	}
 }