Client can now connect to servers interactively

luprex/cpp/core/util.hpp

@@ -62,6 +62,9 @@ bool valid_double(string_view v);
 bool valid_int64(string_view v);
 bool valid_hex64(string_view v);
 
+// Check if a hostname is a valid DNS (ascii) hostname.
+bool valid_hostname(string_view v);
+
 // Convert strings to numbers.  Returns errval on failure.
 //
 // The integer parser accepts a sequence of digits,