Netstack (#1403)

Add netstack support for the agent to run it without privileges.

- use interface for tun device
- use common IPC for userspace WireGuard integration
- move udpmux creation and sharedsock to tun layer

client/internal/mobile_dependency.go

@@ -9,11 +9,14 @@ import (
 
 // MobileDependency collect all dependencies for mobile platform
 type MobileDependency struct {
+	// Android only
 	TunAdapter            iface.TunAdapter
 	IFaceDiscover         stdnet.ExternalIFaceDiscover
 	NetworkChangeListener listener.NetworkChangeListener
 	HostDNSAddresses      []string
 	DnsReadyListener      dns.ReadyListener
-	DnsManager            dns.IosDnsManager
-	FileDescriptor        int32
+
+	//	iOS only
+	DnsManager     dns.IosDnsManager
+	FileDescriptor int32
 }