Both AS 23456 and AS 0 are reserved and can nor be used. Extend check for

AS 0 and adjust yyerror message to print the right number.
With input and OK denis@

diff --git a/usr.sbin/bgpd/parse.y b/usr.sbin/bgpd/parse.y
index 66d5a3a..d506576 100644 (file)
--- a/usr.sbin/bgpd/parse.y
+++ b/usr.sbin/bgpd/parse.y
@@ -1,4 +1,4 @@
-/*     $OpenBSD: parse.y,v 1.358 2018/09/21 08:15:33 claudio Exp $ */
+/*     $OpenBSD: parse.y,v 1.359 2018/09/21 08:17:15 claudio Exp $ */
 
 /*
  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -297,17 +297,17 @@ as4number : STRING                        {
                                free($1);
                                YYERROR;
                        }
-                       if (uvalh == 0 && uval == AS_TRANS) {
+                       if (uvalh == 0 && (uval == AS_TRANS || uval == 0)) {
                                yyerror("AS %u is reserved and may not be used",
-                                   AS_TRANS);
+                                   uval);
                                YYERROR;
                        }
                        $$ = uval | (uvalh << 16);
                }
                | asnumber {
-                       if ($1 == AS_TRANS) {
+                       if ($1 == AS_TRANS || $1 == 0) {
                                yyerror("AS %u is reserved and may not be used",
-                                   AS_TRANS);
+                                   (u_int32_t)$1);
                                YYERROR;
                        }
                        $$ = $1;