warn if you're running tor as root

svn:r921

src/or/main.c

@@ -623,6 +623,11 @@ int tor_main(int argc, char *argv[]) {
   add_stream_log(LOG_INFO, "<stdout>", stdout);
   log_fn(LOG_WARN,"Tor v%s. This is experimental software. Do not use it if you need anonymity.",VERSION);
 
+#ifndef MS_WINDOWS
+  if(geteuid()==0)
+    log_fn(LOG_WARN,"You are running Tor as root. You don't need to, and you probably shouldn't.");
+#endif
+
   if (init_from_config(argc,argv) < 0)
     return -1;