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-rw-r--r--include/arpa/nameser.h3
-rw-r--r--resolv/Makefile2
-rw-r--r--resolv/Versions1
-rw-r--r--resolv/ns_makecanon.c50
-rw-r--r--resolv/ns_samedomain.c38
-rw-r--r--resolv/resolv-deprecated.c35
6 files changed, 92 insertions, 37 deletions
diff --git a/include/arpa/nameser.h b/include/arpa/nameser.h
index eff25178c8..a529cc86d3 100644
--- a/include/arpa/nameser.h
+++ b/include/arpa/nameser.h
@@ -69,9 +69,10 @@ libresolv_hidden_proto (ns_sprintrr)
 libresolv_hidden_proto (ns_sprintrrf)
 libresolv_hidden_proto (ns_samedomain)
 libresolv_hidden_proto (ns_samename)
-libresolv_hidden_proto (ns_makecanon)
 libresolv_hidden_proto (ns_format_ttl)
 
+extern __typeof (ns_makecanon) __libc_ns_makecanon;
+libc_hidden_proto (__libc_ns_makecanon)
 extern __typeof (ns_name_compress) __ns_name_compress;
 libc_hidden_proto (__ns_name_compress)
 extern __typeof (ns_name_ntop) __ns_name_ntop;
diff --git a/resolv/Makefile b/resolv/Makefile
index 221bdc153d..d1ad5e4cba 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -35,6 +35,7 @@ routines := \
   inet_addr \
   inet_ntop \
   inet_pton \
+  ns_makecanon \
   ns_name_compress \
   ns_name_ntop \
   ns_name_pack \
@@ -151,6 +152,7 @@ libresolv-routines := \
   res_mkquery \
   res_query \
   res_send \
+  resolv-deprecated \
   # libresolv-routines
 
 $(libanl-routines-var) += \
diff --git a/resolv/Versions b/resolv/Versions
index fc14cdb701..93078de25c 100644
--- a/resolv/Versions
+++ b/resolv/Versions
@@ -72,6 +72,7 @@ libc {
     __inet_pton_length;
     __libc_dn_expand;
     __libc_dn_skipname;
+    __libc_ns_makecanon;
     __libc_res_dnok;
     __libc_res_hnok;
     __ns_name_compress;
diff --git a/resolv/ns_makecanon.c b/resolv/ns_makecanon.c
new file mode 100644
index 0000000000..a6c3c2737d
--- /dev/null
+++ b/resolv/ns_makecanon.c
@@ -0,0 +1,50 @@
+/* Add missing "." to domain names.
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1995,1999 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 <arpa/nameser.h>
+#include <errno.h>
+#include <string.h>
+
+/* Make a canonical copy of domain name SRC in DST.  Behavior:
+      foo -> foo.
+      foo. -> foo.
+      foo.. -> foo.
+      foo\. -> foo\..
+      foo\\. -> foo\\.  */
+int
+__libc_ns_makecanon (const char *src, char *dst, size_t dstsize)
+{
+  size_t n = strlen (src);
+
+  if (n + sizeof "." > dstsize) /* sizeof == 2.  */
+    {
+      __set_errno (EMSGSIZE);
+      return -1;
+    }
+  strcpy (dst, src);
+  while (n >= 1U && dst[n - 1] == '.')   /* Ends in ".".  */
+    if (n >= 2U && dst[n - 2] == '\\' && /* Ends in "\.".  */
+        (n < 3U || dst[n - 3] != '\\'))  /* But not "\\.".  */
+      break;
+    else
+      dst[--n] = '\0';
+  dst[n++] = '.';
+  dst[n] = '\0';
+  return 0;
+}
+libc_hidden_def (__libc_ns_makecanon)
diff --git a/resolv/ns_samedomain.c b/resolv/ns_samedomain.c
index 5d1bf39fc7..cfff2516b0 100644
--- a/resolv/ns_samedomain.c
+++ b/resolv/ns_samedomain.c
@@ -144,40 +144,6 @@ ns_subdomain(const char *a, const char *b) {
 }
 
 /*%
- *	make a canonical copy of domain name "src"
- *
- * notes:
- * \code
- *	foo -> foo.
- *	foo. -> foo.
- *	foo.. -> foo.
- *	foo\. -> foo\..
- *	foo\\. -> foo\\.
- * \endcode
- */
-
-int
-ns_makecanon(const char *src, char *dst, size_t dstsize) {
-	size_t n = strlen(src);
-
-	if (n + sizeof "." > dstsize) {			/*%< Note: sizeof == 2 */
-		__set_errno (EMSGSIZE);
-		return (-1);
-	}
-	strcpy(dst, src);
-	while (n >= 1U && dst[n - 1] == '.')		/*%< Ends in "." */
-		if (n >= 2U && dst[n - 2] == '\\' &&	/*%< Ends in "\." */
-		    (n < 3U || dst[n - 3] != '\\'))	/*%< But not "\\." */
-			break;
-		else
-			dst[--n] = '\0';
-	dst[n++] = '.';
-	dst[n] = '\0';
-	return (0);
-}
-libresolv_hidden_def (ns_makecanon)
-
-/*%
  *	determine whether domain name "a" is the same as domain name "b"
  *
  * return:
@@ -190,8 +156,8 @@ int
 ns_samename(const char *a, const char *b) {
 	char ta[NS_MAXDNAME], tb[NS_MAXDNAME];
 
-	if (ns_makecanon(a, ta, sizeof ta) < 0 ||
-	    ns_makecanon(b, tb, sizeof tb) < 0)
+	if (__libc_ns_makecanon(a, ta, sizeof ta) < 0 ||
+	    __libc_ns_makecanon(b, tb, sizeof tb) < 0)
 		return (-1);
 	if (strcasecmp(ta, tb) == 0)
 		return (1);
diff --git a/resolv/resolv-deprecated.c b/resolv/resolv-deprecated.c
new file mode 100644
index 0000000000..cbd1078dc2
--- /dev/null
+++ b/resolv/resolv-deprecated.c
@@ -0,0 +1,35 @@
+/* Forwarders for deprecated libresolv functions which are implemented in libc.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Some functions are used by the stub resolver implementation
+   internally and thus have to be located in libc.  They have been
+   historially exported for application use as well.  However, the
+   stub resolver dependency on those functions is not intrinsic to
+   what the stub resolver does, and it is possible that a future
+   version of the stub resolver will not need them anymore.  The
+   public symbols for these functions remain in libresolv, and are not
+   moved to libc, to avoid adding new symbol versions for legacy
+   functions.  */
+
+#include <arpa/nameser.h>
+
+int
+ns_makecanon (const char *src, char *dst, size_t dstsize)
+{
+  return __libc_ns_makecanon (src, dst, dstsize);
+}