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/getaddrinfo.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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

diff --git a/src/lib/libc/net/getaddrinfo.c b/src/lib/libc/net/getaddrinfo.c
index 1326473fb7..0a0b112589 100644
--- a/src/lib/libc/net/getaddrinfo.c
+++ b/src/lib/libc/net/getaddrinfo.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: getaddrinfo.c,v 1.27 2000/08/31 17:41:51 itojun Exp $	*/
+/*	$OpenBSD: getaddrinfo.c,v 1.28 2001/06/11 10:05:58 itojun Exp $	*/
 /*	$KAME: getaddrinfo.c,v 1.31 2000/08/31 17:36:43 itojun Exp $	*/
 
 /*
@@ -1511,6 +1511,7 @@ _yp_getaddrinfo(name, pai)
 
 extern const char *__hostalias __P((const char *));
 extern int h_errno;
+extern int res_opt __P((int, u_char *, int, int));
 
 /*
  * Formulate a normal query, send, and await answer.
@@ -1562,6 +1563,8 @@ res_queryN(name, target)
 
 		n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL,
 		    buf, sizeof(buf));
+		if (n > 0 && (_res.options & RES_USE_EDNS0) != 0)
+			n = res_opt(n, buf, sizeof(buf), anslen);
 		if (n <= 0) {
 #ifdef DEBUG
 			if (_res.options & RES_DEBUG)
-- 
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