Restore lookup of IPv4 mapped addresses in files database (bug 25457)

This was broken by commit 9c02d0784d ("nss_files: Remove RES_USE_INET6
from hosts processing"), which removed too much.

1 files changed, 41 insertions, 0 deletions

diff --git a/nss/tst-nss-files-hosts-v4mapped.c b/nss/tst-nss-files-hosts-v4mapped.c
new file mode 100644
index 0000000000..45582904e6
--- /dev/null
+++ b/nss/tst-nss-files-hosts-v4mapped.c
@@ -0,0 +1,41 @@
+/* Test lookup of IPv4 mapped addresses in files database (bug 25457)
+
+   Copyright (C) 2023 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; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+static int
+do_test (void)
+{
+  struct sockaddr_in6 s6 = { .sin6_family = AF_INET6 };
+  inet_pton (AF_INET6, "::ffff:192.168.0.1", &s6.sin6_addr);
+
+  char node[NI_MAXHOST];
+  int res = getnameinfo ((struct sockaddr *) &s6, sizeof (s6), node,
+			 sizeof (node), NULL, 0, NI_NAMEREQD);
+  if (res)
+    printf ("%d %s\n", res, gai_strerror (res));
+  else
+    printf ("node=%s\n", node);
+
+  return res != 0;
+}
+
+#include <support/test-driver.c>