Add support for running a helper program to read the password when

no tty is present (or when specified with the -A flag).  TODO: docs.

auth/sudo_auth.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999-2005 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 1999-2005, 2008 Todd C. Miller <Todd.Miller@courtesan.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -195,7 +195,8 @@ verify_user(pw, prompt)
 		break;
 	}
 
-	pass_warn(stderr);
+	if (!ISSET(tgetpass_flags, TGP_ASKPASS))
+	    pass_warn(stderr);
     }
 
 cleanup: