Rework DeviceLink and Mobilebackup2Service

Netimobiledevice/Lockdown/Services/DeviceLink.cs

@@ -0,0 +1,70 @@
+using Netimobiledevice.Plist;
+using System;
+using System.Threading.Tasks;
+
+namespace Netimobiledevice.Lockdown.Services
+{
+    internal class DeviceLink : IDisposable
+    {
+        private const int SERVICE_TIMEOUT = 60 * 1000;
+
+        private readonly ServiceConnection _service;
+
+        public DeviceLink(ServiceConnection service)
+        {
+            _service = service;
+            _service.SetTimeout(SERVICE_TIMEOUT);
+        }
+
+        private void Disconnect()
+        {
+            ArrayNode message = new ArrayNode {
+                new StringNode("DLMessageDisconnect"),
+                new StringNode("___EmptyParameterString___")
+            };
+            _service.SendPlist(message, PlistFormat.Binary);
+        }
+
+        public void Dispose()
+        {
+            Disconnect();
+        }
+
+        public async Task<ArrayNode> ReceiveMessage()
+        {
+            PropertyNode? message = await _service.ReceivePlist();
+            if (message == null) {
+                return new ArrayNode();
+            }
+            return message.AsArrayNode();
+        }
+
+        public void Send(PropertyNode message)
+        {
+            _service.SendPlist(message, PlistFormat.Binary);
+        }
+
+        public void SendProcessMessage(PropertyNode message)
+        {
+            _service.SendPlist(new ArrayNode() {
+                new StringNode("DLMessageProcessMessage"),
+                message
+            }, PlistFormat.Binary);
+        }
+
+        public async Task VersionExchange()
+        {
+            ArrayNode versionExchangeMessage = await ReceiveMessage();
+            PropertyNode versionMajor = versionExchangeMessage[1];
+            _service.SendPlist(new ArrayNode {
+                new StringNode("DLMessageVersionExchange"),
+                new StringNode("DLVersionsOk"),
+                versionMajor
+            });
+            ArrayNode messageDeviceReady = await ReceiveMessage();
+            if (messageDeviceReady[0].AsStringNode().Value != "DLMessageDeviceReady") {
+                throw new Exception("Device link didn't return ready state");
+            }
+        }
+    }
+}