From b30cf20f8c70e7eda1c70e908ef06b4819bacf9a Mon Sep 17 00:00:00 2001
From: Iwan Timmer <irtimmer@gmail.com>
Date: Fri, 1 Apr 2016 19:13:16 +0200
Subject: [PATCH] Check protocol version

---
 libgamestream/client.c | 10 ++++++++++
 libgamestream/client.h |  3 +++
 libgamestream/errors.h |  3 ++-
 src/main.c             |  3 +++
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/libgamestream/client.c b/libgamestream/client.c
index b99e866..937cba3 100644
--- a/libgamestream/client.c
+++ b/libgamestream/client.c
@@ -268,6 +268,16 @@ static int load_server_status(PSERVER_DATA server) {
     i++;
   } while (ret != GS_OK && i < 2);
 
+  if (ret == GS_OK) {
+    if (server->serverMajorVersion > MAX_SUPPORTED_GFE_VERSION) {
+      gs_error = "Ensure you're running the latest version of Moonlight Embedded or downgrade GeForce Experience and try again";
+      ret = GS_UNSUPPORTED_VERSION;
+    } else if (server->serverMajorVersion < MIN_SUPPORTED_GFE_VERSION) {
+      gs_error = "Moonlight Embedded requires a newer version of GeForce Experience. Please upgrade GFE on your PC and try again.";
+      ret = GS_UNSUPPORTED_VERSION;
+    }
+  }
+
   return ret;
 }
 
diff --git a/libgamestream/client.h b/libgamestream/client.h
index dafc461..9a8fc91 100644
--- a/libgamestream/client.h
+++ b/libgamestream/client.h
@@ -25,6 +25,9 @@
 
 #include <stdbool.h>
 
+#define MIN_SUPPORTED_GFE_VERSION 3
+#define MAX_SUPPORTED_GFE_VERSION 7
+
 typedef struct _SERVER_DATA {
   const char* address;
   char* gpuType;
diff --git a/libgamestream/errors.h b/libgamestream/errors.h
index 441aea3..99e3187 100644
--- a/libgamestream/errors.h
+++ b/libgamestream/errors.h
@@ -1,7 +1,7 @@
 /*
  * This file is part of Moonlight Embedded.
  *
- * Copyright (C) 2015 Iwan Timmer
+ * Copyright (C) 2015, 2016 Iwan Timmer
  *
  * Moonlight is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -26,5 +26,6 @@
 #define GS_WRONG_STATE -4
 #define GS_IO_ERROR -5
 #define GS_NOT_SUPPORTED_4K -6
+#define GS_UNSUPPORTED_VERSION -7
 
 const char* gs_error;
diff --git a/src/main.c b/src/main.c
index ba14d31..378625b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -226,6 +226,9 @@ int main(int argc, char* argv[]) {
   } else if (ret == GS_INVALID) {
     fprintf(stderr, "Invalid data received from server: %s\n", config.address, gs_error);
     exit(-1);
+  } else if (ret == GS_UNSUPPORTED_VERSION) {
+    fprintf(stderr, "Unsupported version: %s\n", gs_error);
+    exit(-1);
   } else if (ret != GS_OK) {
     fprintf(stderr, "Can't connect to server %s\n", config.address);
     exit(-1);