[client] main: if spice is in use check the guest uuid matches

If the guest supports sending us it's UUID and PureSpice has also
reported the guest's UUID, check them to see if the user has
accidentially connected to the wrong spice socket.

client/src/main.c

@@ -837,10 +837,43 @@ static void audioData(uint8_t * data, size_t size)
     g_state.audioDev->play(data, size);
 }
 
+static void checkUUID(void)
+{
+  if (!g_state.spiceUUIDValid || !g_state.guestUUIDValid)
+    return;
+
+  if (memcmp(g_state.spiceUUID, g_state.guestUUID,
+        sizeof(g_state.spiceUUID)) != 0)
+    return;
+
+  DEBUG_ERROR("UUIDs do not match, you have connected SPICE to the wrong guest");
+  DEBUG_ERROR("Shutting down");
+  g_state.state = APP_STATE_SHUTDOWN;
+}
+
 void spiceReady(void)
 {
   // set the intial mouse mode
   purespice_mouseMode(true);
+
+  PSServerInfo info;
+  if (!purespice_getServerInfo(&info))
+    return;
+
+  bool uuidValid = false;
+  for(int i = 0; i < sizeof(info.uuid); ++i)
+    if (info.uuid[i])
+    {
+      uuidValid = true;
+      break;
+    }
+
+  if (!uuidValid)
+    return;
+
+  memcpy(g_state.spiceUUID, info.uuid, sizeof(g_state.spiceUUID));
+  g_state.spiceUUIDValid = true;
+  checkUUID();
 }
 
 int spiceThread(void * arg)
@@ -1313,19 +1346,20 @@ restart:
             vmInfo->cores, vmInfo->cpus);
         DEBUG_INFO("Capture Device : %s", vmInfo->capture);
 
-        bool checkUUID = false;
-        for(int i = 0; i < 16; ++i)
+        bool uuidValid = false;
+        for(int i = 0; i < sizeof(vmInfo->uuid); ++i)
          if (vmInfo->uuid[i])
          {
-           checkUUID = true;
+           uuidValid = true;
            break;
          }
 
-        if (!checkUUID)
+        if (!uuidValid)
           break;
 
-        //TODO: compare UUID with the one provided by SPICE if SPICE is in use
-
+        memcpy(g_state.guestUUID, vmInfo->uuid, sizeof(g_state.guestUUID));
+        g_state.guestUUIDValid = true;
+        checkUUID();
         break;
       }
 

client/src/main.h

@@ -72,6 +72,11 @@ struct AppState
   bool                         dsInitialized;
   bool                         jitRender;
 
+  uint8_t spiceUUID[16];
+  bool    spiceUUIDValid;
+  uint8_t guestUUID[16];
+  bool    guestUUIDValid;
+
   bool                 stopVideo;
   bool                 ignoreInput;
   bool                 escapeActive;