Add --uuid CLA

Readme.md

@@ -4,3 +4,15 @@ A simple, zero-config DLNA media server, that you can just fire up and be done w
 
 
 See [the github page](http://nmaier.github.io/simpleDLNA/) for more details and downloads.
+
+
+What's new
+----------
+
+- Added `--uuid` command-line option to set a static server UUID, e.g.:
+
+  ```
+  sdlna.exe --uuid 12345678-1234-1234-1234-123456789abc D:\Media
+  ```
+
+- Device UUIDs are now derived deterministically from the server UUID and the IP address. This keeps device identifiers stable across restarts as long as the server UUID and IP remain the same.

fsserver/FileServer.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.IO;
 using System.Linq;
@@ -57,6 +57,8 @@ public sealed class FileServer
 
     private FileStore store;
 
+    private Guid uuid;
+
     public FileServer(DlnaMediaTypes types, Identifiers ids,
       params DirectoryInfo[] directories)
     {
@@ -80,6 +82,13 @@ public FileServer(DlnaMediaTypes types, Identifiers ids,
       UUID = DeriveUUID();
     }
 
+    public FileServer(DlnaMediaTypes types, Identifiers ids, Guid fixedUuid,
+      params DirectoryInfo[] directories)
+      : this(types, ids, directories)
+    {
+      UUID = fixedUuid;
+    }
+
     internal ExtensionFilter Filter { get; }
 
     public void Dispose()
@@ -98,7 +107,7 @@ public void Dispose()
     public string FriendlyName { get; set; }
 
     // ReSharper disable once MemberInitializerValueIgnored
-    public Guid UUID { get; } = Guid.NewGuid();
+    public Guid UUID { get; private set; } = Guid.NewGuid();
 
     public IMediaItem GetItem(string id)
     {

sdlna/Options.cs

@@ -65,6 +65,30 @@ internal class Options : GetOpt
 
     [Argument("view", HelpText = "Apply a view (default: no views applied)", HelpVar = "view")] [ShortArgument('v')] public string[] Views = new string[0];
 
+    private Guid? uuid;
+
+    [Argument("uuid", HelpText = "Static server UUID (e.g. 12345678-1234-1234-1234-123456789abc)", HelpVar = "uuid")]
+    public string Uuid
+    {
+      get { return uuid?.ToString(); }
+      set {
+        if (string.IsNullOrWhiteSpace(value)) {
+          uuid = null;
+          return;
+        }
+        Guid parsed;
+        if (!Guid.TryParse(value, out parsed)) {
+          throw new GetOptException($"Not a valid UUID: {value}");
+        }
+        uuid = parsed;
+      }
+    }
+
+    public Guid? ParsedUuid
+    {
+      get { return uuid; }
+    }
+
     [Argument("ip", HelpText = "Allow only specified IPs", HelpVar = "IP")]
     [ShortArgument('i')]
     public string[] Ips

sdlna/Program.cs

@@ -189,7 +189,13 @@ private static FileServer SetupFileServer(Options options,
           throw new GetOptException("Invalid view " + v);
         }
       }
-      var fs = new FileServer(types, ids, d);
+      FileServer fs;
+      if (options.ParsedUuid.HasValue) {
+        fs = new FileServer(types, ids, options.ParsedUuid.Value, d);
+      }
+      else {
+        fs = new FileServer(types, ids, d);
+      }
       try {
         if (!string.IsNullOrEmpty(options.FriendlyName)) {
           fs.FriendlyName = options.FriendlyName;

server/Http/HTTPServer.cs

@@ -257,7 +257,7 @@ public void RegisterMediaServer(IMediaServer server)
 
       foreach (var address in IP.ExternalIPAddresses) {
         DebugFormat("Registering device for {0}", address);
-        var deviceGuid = Guid.NewGuid();
+        var deviceGuid = DeriveDeviceUuid(guid, address);
         var list = devicesForServers.GetOrAdd(guid, new List<Guid>());
         lock (list) {
           list.Add(deviceGuid);
@@ -271,6 +271,23 @@ public void RegisterMediaServer(IMediaServer server)
       }
     }
 
+    private static Guid DeriveDeviceUuid(Guid serverUuid, IPAddress address)
+    {
+      // Стабильный UUID на основе UUID сервера и адреса устройства (per-IP)
+      var serverBytes = serverUuid.ToByteArray();
+      var addrBytes = address.GetAddressBytes();
+      var combined = new byte[16];
+      for (var i = 0; i < 16; i++) {
+        var sb = serverBytes[i];
+        var ab = addrBytes[i % addrBytes.Length];
+        combined[i] = (byte)(sb ^ ab);
+      }
+      // Установка версии 4 и варианта RFC 4122 для корректной формы UUID
+      combined[6] = (byte)((combined[6] & 0x0F) | 0x40);
+      combined[8] = (byte)((combined[8] & 0x3F) | 0x80);
+      return new Guid(combined);
+    }
+
     public void UnregisterMediaServer(IMediaServer server)
     {
       if (server == null) {