Update the resolver in libc to BIND9's one.

Since, res_sendsigned(3) and the friends use MD5 functions, it is
hard to include them without having MD5 functions in libc.  So,
res_sendsigned(3) is not merged into libc.

Since, res_update(3) in BIND9 is not binary compatible with our
res_update(3), res_update(3) is leaved as is, except some
necessary modifications.
The res_update(3) and the friends are not essential part of the
resolver.  They are not defined in resolv.h but defined in
res_update.h separately in BIND9.  Further, they are not called from
our tree.  So, I hide them from our resolv.h, but leave them only
for binary backward compatibility (perhaps, no one calls them).

Since, struct __res_state_ext is not exposed in BIND9, I hide it
from our resolv.h.  And, global variable _res_ext is removed.  It
breaks binary backward compatibility.  But, since it is not used from
outside of our libc, I think it is safe.

Reviewed by:	arch@ (no objection)

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/libc/net/getnetbynis.c b/lib/libc/net/getnetbynis.c
index 200e7a4..ea7c3d4 100644
--- a/lib/libc/net/getnetbynis.c
+++ b/lib/libc/net/getnetbynis.c
@@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>
+#include <resolv.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
@@ -88,7 +89,7 @@ _getnetbynis(const char *name, char *map, int af, struct netent *ne,
 	ep = ned->netbuf + sizeof ned->netbuf;
 	len = strlen(result) + 1;
 	if (ep - bp < len) {
-		h_errno = NO_RECOVERY;
+		RES_SET_H_ERRNO(__res_state(), NO_RECOVERY);
 		return -1;
 	}
 	strlcpy(bp, result, ep - bp);