Add EDNS0 support.

EDNS allows for various DNS extensions, among which UDP DNS packets size
bigger than 512 bytes.  The default is still to not advertize anything.

ok eric@

1 files changed, 3 insertions, 4 deletions

diff --git a/src/lib/libc/net/resolver.3 b/src/lib/libc/net/resolver.3
index c395c9929b..68e509f4f0 100644
--- a/src/lib/libc/net/resolver.3
+++ b/src/lib/libc/net/resolver.3
@@ -1,4 +1,4 @@
-.\"     $OpenBSD: resolver.3,v 1.35 2017/01/24 12:43:00 jmc Exp $
+.\"     $OpenBSD: resolver.3,v 1.36 2017/02/18 19:23:05 jca Exp $
 .\"
 .\" Copyright (c) 1985, 1991, 1993
 .\"     The Regents of the University of California.  All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 24 2017 $
+.Dd $Mdocdate: February 18 2017 $
 .Dt RES_INIT 3
 .Os
 .Sh NAME
@@ -193,9 +193,8 @@ allowing them to take advantage of a non-default receive buffer size,
 and thus to send larger replies.
 DNS query packets with the EDNS0 extension are not compatible with
 non-EDNS0 DNS servers.
-On
 .Ox
-this option does nothing.
+uses 4096 bytes as input buffer size.
 .It Dv RES_USE_DNSSEC
 Request that the resolver uses
 Domain Name System Security Extensions (DNSSEC),