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

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This was broken by commit 9c02d0784d ("nss_files: Remove RES_USE_INET6
from hosts processing"), which removed too much.
This commit is contained in:
Andreas Schwab 2023-07-19 09:55:31 +02:00
parent bb9a4fc028
commit c437631485
6 changed files with 128 additions and 9 deletions
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1
nss/Makefile
View File

@ -77,6 +77,7 @@ tests-container := \
tst-nss-db-endgrent \
tst-nss-db-endpwent \
tst-nss-files-hosts-long \
tst-nss-files-hosts-v4mapped \
tst-nss-gai-actions \
tst-nss-test3 \
tst-reload1 \

22
nss/nss_files/files-hosts.c
View File

@ -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
@ -60,7 +61,11 @@ LINE_PARSER
af = af == AF_UNSPEC ? AF_INET : af;
else
{
if (af == AF_INET
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))
@ -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;

41
nss/tst-nss-files-hosts-v4mapped.c Normal file
View File

@ -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>

1
nss/tst-nss-files-hosts-v4mapped.root/etc/hosts Normal file
View File

@ -0,0 +1 @@
192.168.0.1 v4mapped

1
nss/tst-nss-files-hosts-v4mapped.root/etc/nsswitch.conf Normal file
View File

@ -0,0 +1 @@
hosts: files

69
resolv/mapv4v6addr.h Normal file
View File

@ -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;
}