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, 0 insertions, 189 deletions

diff --git a/lib/libc/net/ns_parse.c b/lib/libc/net/ns_parse.c
deleted file mode 100644
index 7b32fa4..0000000
--- a/lib/libc/net/ns_parse.c
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * Copyright (c) 1996 by Internet Software Consortium.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
- * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
- * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/types.h>
-
-#include <netinet/in.h>
-#include <arpa/nameser.h>
-
-#include <errno.h>
-#include <resolv.h>
-#include <string.h>
-
-/* These need to be in the same order as the nres.h:ns_flag enum. */
-struct _ns_flagdata _ns_flagdata[16] = {
-	{ 0x8000, 15 },		/* qr. */
-	{ 0x7800, 11 },		/* opcode. */
-	{ 0x0400, 10 },		/* aa. */
-	{ 0x0200, 9 },		/* tc. */
-	{ 0x0100, 8 },		/* rd. */
-	{ 0x0080, 7 },		/* ra. */
-	{ 0x0040, 6 },		/* z. */
-	{ 0x0020, 5 },		/* ad. */
-	{ 0x0010, 4 },		/* cd. */
-	{ 0x000f, 0 },		/* rcode. */
-	{ 0x0000, 0 },		/* expansion (1/6). */
-	{ 0x0000, 0 },		/* expansion (2/6). */
-	{ 0x0000, 0 },		/* expansion (3/6). */
-	{ 0x0000, 0 },		/* expansion (4/6). */
-	{ 0x0000, 0 },		/* expansion (5/6). */
-	{ 0x0000, 0 },		/* expansion (6/6). */
-};
-
-static int
-skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
-	const u_char *optr = ptr;
-
-	for ((void)NULL; count > 0; count--) {
-		int b, rdlength;
-
-		b = dn_skipname(ptr, eom);
-		if (b < 0)
-			goto emsgsize;
-		ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
-		if (section != ns_s_qd) {
-			if (ptr + NS_INT32SZ > eom)
-				goto emsgsize;
-			ptr += NS_INT32SZ/*TTL*/;
-			if (ptr + NS_INT16SZ > eom)
-				goto emsgsize;
-			NS_GET16(rdlength, ptr);
-			ptr += rdlength/*RData*/;
-		}
-	}
-	if (ptr > eom)
-		goto emsgsize;
-	return (ptr - optr);
- emsgsize:
-	errno = EMSGSIZE;
-	return (-1);
-}
-
-int
-ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
-	const u_char *eom = msg + msglen;
-	int i;
-
-	memset(handle, 0x5e, sizeof *handle);
-	handle->_msg = msg;
-	handle->_eom = eom;
-	if (msg + NS_INT16SZ > eom)
-		goto emsgsize;
-	NS_GET16(handle->_id, msg);
-	if (msg + NS_INT16SZ > eom)
-		goto emsgsize;
-	NS_GET16(handle->_flags, msg);
-	for (i = 0; i < ns_s_max; i++) {
-		if (msg + NS_INT16SZ > eom)
-			goto emsgsize;
-		NS_GET16(handle->_counts[i], msg);
-	}
-	for (i = 0; i < ns_s_max; i++)
-		if (handle->_counts[i] == 0)
-			handle->_sections[i] = NULL;
-		else {
-			int b = skiprr(msg, eom, (ns_sect)i,
-				       handle->_counts[i]);
-
-			if (b < 0)
-				return (-1);
-			handle->_sections[i] = msg;
-			msg += b;
-		}
-	if (msg != eom)
-		goto emsgsize;
-	handle->_sect = ns_s_max;
-	handle->_rrnum = -1;
-	handle->_ptr = NULL;
-	return (0);
- emsgsize:
-	errno = EMSGSIZE;
-	return (-1);
-}
-
-int
-ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
-	int b;
-
-	/* Make section right. */
-	if (section < 0 || section >= ns_s_max)
-		goto enodev;
-	if ((int)section != (int)handle->_sect) {
-		handle->_sect = section;
-		handle->_rrnum = 0;
-		handle->_ptr = handle->_sections[(int)section];
-	}
-
-	/* Make rrnum right. */
-	if (rrnum == -1)
-		rrnum = handle->_rrnum;
-	if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
-		goto enodev;
-	if (rrnum < handle->_rrnum) {
-		handle->_rrnum = 0;
-		handle->_ptr = handle->_sections[(int)section];
-	}
-	
-	b = skiprr(handle->_msg, handle->_eom, section,
-		   rrnum - handle->_rrnum);
-	if (b < 0)
-		return (-1);
-	handle->_ptr += b;
-	handle->_rrnum = rrnum;
-
-	/* Do the parse. */
-	b = dn_expand(handle->_msg, handle->_eom,
-		      handle->_ptr, rr->name, NS_MAXDNAME);
-	if (b < 0)
-		return (-1);
-	handle->_ptr += b;
-	if (handle->_ptr + NS_INT16SZ > handle->_eom)
-		goto emsgsize;
-	NS_GET16(rr->type, handle->_ptr);
-	if (handle->_ptr + NS_INT16SZ > handle->_eom)
-		goto emsgsize;
-	NS_GET16(rr->rr_class, handle->_ptr);
-	if (section == ns_s_qd) {
-		rr->ttl = 0;
-		rr->rdlength = 0;
-		rr->rdata = NULL;
-	} else {
-		if (handle->_ptr + NS_INT32SZ > handle->_eom)
-			goto emsgsize;
-		NS_GET32(rr->ttl, handle->_ptr);
-		if (handle->_ptr + NS_INT16SZ > handle->_eom)
-			goto emsgsize;
-		NS_GET16(rr->rdlength, handle->_ptr);
-		if (handle->_ptr + rr->rdlength > handle->_eom)
-			goto emsgsize;
-		rr->rdata = handle->_ptr;
-		handle->_ptr += rr->rdlength;
-	}
-	handle->_rrnum++;
-
-	/* All done. */
-	return (0);
- enodev:
-	errno = ENODEV;
-	return (-1);
- emsgsize:
-	errno = EMSGSIZE;
-	return (-1);
-}