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glibc/glibc-rh2224504-2.patch
Florian Weimer a02be7c868 Fix regression with IPv4 mapped addresses in /etc/hosts (#2224504) 
Resolves: #2224504
2023-07-28 15:40:24 +02:00

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commit c437631485a85c3bd034e12f53dd1c8207f05940
Author: Andreas Schwab <schwab@suse.de>
Date: Wed Jul 19 09:55:31 2023 +0200
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.
Conflicts:
nss/Makefile
(missing tst-nss-gai-actions downstream)
diff --git a/nss/Makefile b/nss/Makefile
index aa6d350f2f859d12..f01674a16e720b88 100644
--- a/nss/Makefile
+++ b/nss/Makefile
@@ -76,6 +76,7 @@ tests-container := \
tst-nss-db-endgrent \
tst-nss-db-endpwent \
tst-nss-files-hosts-long \
+ tst-nss-files-hosts-v4mapped \
tst-nss-test3 \
tst-reload1 \
tst-reload2 \
diff --git a/nss/nss_files/files-hosts.c b/nss/nss_files/files-hosts.c
index d54d91d038a03c18..f6f11fb18b43fa9f 100644
--- a/nss/nss_files/files-hosts.c
+++ b/nss/nss_files/files-hosts.c
@@ -27,6 +27,7 @@
#include <nss.h>
/* Get implementation for some internal functions. */
+#include "../resolv/mapv4v6addr.h"
#include "../resolv/res_hconf.h"
@@ -34,8 +35,8 @@
#define DATABASE "hosts"
#define NEED_H_ERRNO
-#define EXTRA_ARGS , af
-#define EXTRA_ARGS_DECL , int af
+#define EXTRA_ARGS , af, flags
+#define EXTRA_ARGS_DECL , int af, int flags
#define ENTDATA hostent_data
struct hostent_data
@@ -60,8 +61,12 @@ LINE_PARSER
af = af == AF_UNSPEC ? AF_INET : af;
else
{
- if (af == AF_INET
- && __inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
+ if (af == AF_INET6 && (flags & AI_V4MAPPED) != 0
+ && __inet_pton (AF_INET, addr, entdata->host_addr) > 0)
+ map_v4v6_address ((char *) entdata->host_addr,
+ (char *) entdata->host_addr);
+ else if (af == AF_INET
+ && __inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
{
if (IN6_IS_ADDR_V4MAPPED (entdata->host_addr))
memcpy (entdata->host_addr, entdata->host_addr + 12, INADDRSZ);
@@ -94,13 +99,14 @@ LINE_PARSER
STRING_FIELD (result->h_name, isspace, 1);
})
-#define EXTRA_ARGS_VALUE , AF_INET
+#define EXTRA_ARGS_VALUE , AF_INET, 0
#include "files-XXX.c"
#undef EXTRA_ARGS_VALUE
/* We only need to consider IPv4 mapped addresses if the input to the
gethostbyaddr() function is an IPv6 address. */
-#define EXTRA_ARGS_VALUE , af
+#define EXTRA_ARGS_VALUE \
+ , af, (len == IN6ADDRSZ ? AI_V4MAPPED : 0)
DB_LOOKUP (hostbyaddr, ,,,
{
if (result->h_length == (int) len
@@ -152,7 +158,7 @@ gethostbyname3_multi (FILE * stream, const char *name, int af,
while (true)
{
status = internal_getent (stream, &tmp_result_buf, tmp_buffer.data,
- tmp_buffer.length, errnop, herrnop, af);
+ tmp_buffer.length, errnop, herrnop, af, 0);
/* Enlarge the buffer if necessary. */
if (status == NSS_STATUS_TRYAGAIN && *herrnop == NETDB_INTERNAL
&& *errnop == ERANGE)
@@ -337,7 +343,7 @@ _nss_files_gethostbyname3_r (const char *name, int af, struct hostent *result,
if (status == NSS_STATUS_SUCCESS)
{
while ((status = internal_getent (stream, result, buffer, buflen, errnop,
- herrnop, af))
+ herrnop, af, 0))
== NSS_STATUS_SUCCESS)
{
LOOKUP_NAME_CASE (h_name, h_aliases)
@@ -402,7 +408,7 @@ _nss_files_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
struct hostent result;
status = internal_getent (stream, &result, buffer, buflen, errnop,
- herrnop, AF_UNSPEC);
+ herrnop, AF_UNSPEC, 0);
if (status != NSS_STATUS_SUCCESS)
break;
diff --git a/nss/tst-nss-files-hosts-v4mapped.c b/nss/tst-nss-files-hosts-v4mapped.c
new file mode 100644
index 0000000000000000..45582904e68adf29
--- /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>
diff --git a/nss/tst-nss-files-hosts-v4mapped.root/etc/hosts b/nss/tst-nss-files-hosts-v4mapped.root/etc/hosts
new file mode 100644
index 0000000000000000..609b25ad39a879b4
--- /dev/null
+++ b/nss/tst-nss-files-hosts-v4mapped.root/etc/hosts
@@ -0,0 +1 @@
+192.168.0.1 v4mapped
diff --git a/nss/tst-nss-files-hosts-v4mapped.root/etc/nsswitch.conf b/nss/tst-nss-files-hosts-v4mapped.root/etc/nsswitch.conf
new file mode 100644
index 0000000000000000..5b0c6a419937a013
--- /dev/null
+++ b/nss/tst-nss-files-hosts-v4mapped.root/etc/nsswitch.conf
@@ -0,0 +1 @@
+hosts: files
diff --git a/resolv/mapv4v6addr.h b/resolv/mapv4v6addr.h
new file mode 100644
index 0000000000000000..7f85f7d5e393ec5f
--- /dev/null
+++ b/resolv/mapv4v6addr.h
@@ -0,0 +1,69 @@
+/*
+ * ++Copyright++ 1985, 1988, 1993
+ * -
+ * Copyright (c) 1985, 1988, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * -
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ *
+ * 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, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION 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.
+ * -
+ * --Copyright--
+ */
+
+#include <string.h>
+#include <arpa/nameser.h>
+
+static void
+map_v4v6_address (const char *src, char *dst)
+{
+ u_char *p = (u_char *) dst;
+ int i;
+
+ /* Move the IPv4 part to the right position. */
+ memcpy (dst + 12, src, INADDRSZ);
+
+ /* Mark this ipv6 addr as a mapped ipv4. */
+ for (i = 0; i < 10; i++)
+ *p++ = 0x00;
+ *p++ = 0xff;
+ *p = 0xff;
+}
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