From 3181f54059d8f111597b6e6ebec0e24f7939ada7 Mon Sep 17 00:00:00 2001
From: itojun <>
Date: Mon, 11 Jun 2001 10:06:01 +0000
Subject: support EDNS0 (RFC2671) buffer size notification on DNS queries.
 "options edns0" in /etc/resolv.conf will enable the behavior.  no behavior
 change if you don't have the line.  see resolv.conf(5) for more details.

EDNS0 is useful for avoiding TCP DNS queries/replies on larger DNS responses.
also, draft-ietf-dnsext-message-size-* plans to mandate EDNS0 support for DNS
clients that support IPv6 transport.
---
 src/lib/libc/net/res_init.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/lib/libc/net/res_init.c')

diff --git a/src/lib/libc/net/res_init.c b/src/lib/libc/net/res_init.c
index bba8cfaad1..c44539604a 100644
--- a/src/lib/libc/net/res_init.c
+++ b/src/lib/libc/net/res_init.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: res_init.c,v 1.20 2000/11/10 15:33:04 provos Exp $	*/
+/*	$OpenBSD: res_init.c,v 1.21 2001/06/11 10:06:00 itojun Exp $	*/
 
 /*
  * ++Copyright++ 1985, 1989, 1993
@@ -64,7 +64,7 @@
 static char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
 static char rcsid[] = "$From: res_init.c,v 8.7 1996/09/28 06:51:07 vixie Exp $";
 #else
-static char rcsid[] = "$OpenBSD: res_init.c,v 1.20 2000/11/10 15:33:04 provos Exp $";
+static char rcsid[] = "$OpenBSD: res_init.c,v 1.21 2001/06/11 10:06:00 itojun Exp $";
 #endif
 #endif /* LIBC_SCCS and not lint */
 
@@ -608,6 +608,8 @@ res_setoptions(options, source)
 #endif
 		} else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
 			_res.options |= RES_USE_INET6;
+		} else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
+			_res.options |= RES_USE_EDNS0;
 		} else {
 			/* XXX - print a warning here? */
 		}
-- 
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