Start wire-up of logging and tunnel system.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuardNetworkExtension/PacketTunnelProvider.swift

@@ -7,16 +7,31 @@
 //
 
 import NetworkExtension
+import os.log
 
 class PacketTunnelProvider: NEPacketTunnelProvider {
+    let wireGuardWrapper = WireGuardGoWrapper()
+
+    private let tunnelQueue = DispatchQueue(label: PacketTunnelProvider.description())
+
+    //TODO create a way to transfer config into extension
 
     override func startTunnel(options: [String: NSObject]?, completionHandler: @escaping (Error?) -> Void) {
+        os_log("Starting tunnel", log: Log.general, type: .info)
         // Add code here to start the process of connecting the tunnel.
 
+        //TODO get a settings string in here.
+        tunnelQueue.sync {
+            wireGuardWrapper.turnOn(withInterfaceName: "TODO", settingsString: "TODO")
+        }
     }
 
     override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
+        os_log("Stopping tunnel", log: Log.general, type: .info)
         // Add code here to start the process of stopping the tunnel.
+        tunnelQueue.sync {
+            wireGuardWrapper.turnOff()
+        }
         completionHandler()
     }
 
@@ -27,12 +42,21 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
         }
     }
 
-    override func sleep(completionHandler: @escaping () -> Void) {
-        // Add code here to get ready to sleep.
-        completionHandler()
+    private func loopReadPackets(_ handler: @escaping ([Data]?, Error?) -> Void) {
+        packetFlow.readPackets { [weak self] (_, _) in
+            // TODO write packets into the tunnel
+            self?.loopReadPackets(handler)
+        }
     }
 
-    override func wake() {
-        // Add code here to wake up.
+    func writePacket(_ packet: Data, completionHandler: ((Error?) -> Void)?) {
+        packetFlow.writePackets([packet], withProtocols: [AF_INET] as [NSNumber])
+        completionHandler?(nil)
+    }
+
+    func writePackets(_ packets: [Data], completionHandler: ((Error?) -> Void)?) {
+        let protocols = [Int32](repeating: AF_INET, count: packets.count) as [NSNumber]
+        packetFlow.writePackets(packets, withProtocols: protocols)
+        completionHandler?(nil)
     }
 }