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nss_dns: Remove remnants of IPv6 address mapping

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res_use_inet6 always returns false since commit 3f8b44be0a
("resolv: Remove support for RES_USE_INET6 and the inet6 option").

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer 2022-08-30 10:02:49 +02:00
parent e32547d661
commit a7fc30b522
4 changed files with 9 additions and 201 deletions
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3
resolv/README
View File

@ -146,6 +146,3 @@ res_libc.c is home-brewn, although parts of it are taken from res_data.c.
res_hconf.c and res_hconf.h were contributed by David Mosberger, and res_hconf.c and res_hconf.h were contributed by David Mosberger, and
do not come from BIND. do not come from BIND.
The files gethnamaddr.c, mapv4v6addr.h and mapv4v6hostent.h are
leftovers from BIND 4.9.7.

69
resolv/mapv4v6addr.h
View File

@ -1,69 +0,0 @@
/*
* ++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;
}

84
resolv/mapv4v6hostent.h
View File

@ -1,84 +0,0 @@
/*
* ++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 <arpa/nameser.h>
#include <sys/socket.h>
typedef union {
int32_t al;
char ac;
} align;
static int
map_v4v6_hostent (struct hostent *hp, char **bpp, int *lenp)
{
char **ap;
if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
return 0;
hp->h_addrtype = AF_INET6;
hp->h_length = IN6ADDRSZ;
for (ap = hp->h_addr_list; *ap; ap++)
{
int i = sizeof (align) - ((u_long) *bpp % sizeof (align));
if (*lenp < (i + IN6ADDRSZ))
/* Out of memory. */
return 1;
*bpp += i;
*lenp -= i;
map_v4v6_address (*ap, *bpp);
*ap = *bpp;
*bpp += IN6ADDRSZ;
*lenp -= IN6ADDRSZ;
}
return 0;
}

54
resolv/nss_dns/dns-host.c
View File

@ -87,10 +87,6 @@
#include <resolv/resolv-internal.h> #include <resolv/resolv-internal.h>
#include <resolv/resolv_context.h> #include <resolv/resolv_context.h>
/* Get implementations of some internal functions. */
#include <resolv/mapv4v6addr.h>
#include <resolv/mapv4v6hostent.h>
#define RESOLVSORT #define RESOLVSORT
#if PACKETSZ > 65536 #if PACKETSZ > 65536
@ -116,7 +112,7 @@ static enum nss_status getanswer_r (struct resolv_context *ctx,
const char *qname, int qtype, const char *qname, int qtype,
struct hostent *result, char *buffer, struct hostent *result, char *buffer,
size_t buflen, int *errnop, int *h_errnop, size_t buflen, int *errnop, int *h_errnop,
int map, int32_t *ttlp, char **canonp); int32_t *ttlp, char **canonp);
static enum nss_status getanswer_ptr (unsigned char *packet, size_t packetlen, static enum nss_status getanswer_ptr (unsigned char *packet, size_t packetlen,
struct alloc_buffer *abuf, struct alloc_buffer *abuf,
char **hnamep, int *errnop, char **hnamep, int *errnop,
@ -197,7 +193,6 @@ gethostbyname3_context (struct resolv_context *ctx,
char tmp[NS_MAXDNAME]; char tmp[NS_MAXDNAME];
int size, type, n; int size, type, n;
const char *cp; const char *cp;
int map = 0;
int olderr = errno; int olderr = errno;
enum nss_status status; enum nss_status status;
@ -258,32 +253,12 @@ gethostbyname3_context (struct resolv_context *ctx,
*errnop = EAGAIN; *errnop = EAGAIN;
else else
__set_errno (olderr); __set_errno (olderr);
/* If we are looking for an IPv6 address and mapping is enabled
by having the RES_USE_INET6 bit in _res.options set, we try
another lookup. */
if (af == AF_INET6 && res_use_inet6 ())
n = __res_context_search (ctx, name, C_IN, T_A, host_buffer.buf->buf,
host_buffer.buf != orig_host_buffer
? MAXPACKET : 1024, &host_buffer.ptr,
NULL, NULL, NULL, NULL);
if (n < 0)
{
if (host_buffer.buf != orig_host_buffer)
free (host_buffer.buf);
return status;
}
map = 1;
result->h_addrtype = AF_INET;
result->h_length = INADDRSZ;
} }
else
status = getanswer_r
(ctx, host_buffer.buf, n, name, type, result, buffer, buflen,
errnop, h_errnop, ttlp, canonp);
status = getanswer_r
(ctx, host_buffer.buf, n, name, type, result, buffer, buflen,
errnop, h_errnop, map, ttlp, canonp);
if (host_buffer.buf != orig_host_buffer) if (host_buffer.buf != orig_host_buffer)
free (host_buffer.buf); free (host_buffer.buf);
return status; return status;
@ -329,13 +304,8 @@ _nss_dns_gethostbyname_r (const char *name, struct hostent *result,
*h_errnop = NETDB_INTERNAL; *h_errnop = NETDB_INTERNAL;
return NSS_STATUS_UNAVAIL; return NSS_STATUS_UNAVAIL;
} }
status = NSS_STATUS_NOTFOUND; status = gethostbyname3_context (ctx, name, AF_INET, result, buffer,
if (res_use_inet6 ()) buflen, errnop, h_errnop, NULL, NULL);
status = gethostbyname3_context (ctx, name, AF_INET6, result, buffer,
buflen, errnop, h_errnop, NULL, NULL);
if (status == NSS_STATUS_NOTFOUND)
status = gethostbyname3_context (ctx, name, AF_INET, result, buffer,
buflen, errnop, h_errnop, NULL, NULL);
__resolv_context_put (ctx); __resolv_context_put (ctx);
return status; return status;
} }
@ -648,7 +618,7 @@ static enum nss_status
getanswer_r (struct resolv_context *ctx, getanswer_r (struct resolv_context *ctx,
const querybuf *answer, int anslen, const char *qname, int qtype, const querybuf *answer, int anslen, const char *qname, int qtype,
struct hostent *result, char *buffer, size_t buflen, struct hostent *result, char *buffer, size_t buflen,
int *errnop, int *h_errnop, int map, int32_t *ttlp, char **canonp) int *errnop, int *h_errnop, int32_t *ttlp, char **canonp)
{ {
struct host_data struct host_data
{ {
@ -664,7 +634,6 @@ getanswer_r (struct resolv_context *ctx,
char *bp, **ap, **hap; char *bp, **ap, **hap;
char tbuf[MAXDNAME]; char tbuf[MAXDNAME];
u_char packtmp[NS_MAXCDNAME]; u_char packtmp[NS_MAXCDNAME];
int have_to_map = 0;
uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data); uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);
buffer += pad; buffer += pad;
buflen = buflen > pad ? buflen - pad : 0; buflen = buflen > pad ? buflen - pad : 0;
@ -845,9 +814,7 @@ getanswer_r (struct resolv_context *ctx,
continue; continue;
} }
if (type == T_A && qtype == T_AAAA && map) if (__glibc_unlikely (type != qtype))
have_to_map = 1;
else if (__glibc_unlikely (type != qtype))
{ {
cp += n; cp += n;
continue; /* XXX - had_error++ ? */ continue; /* XXX - had_error++ ? */
@ -944,9 +911,6 @@ getanswer_r (struct resolv_context *ctx,
linebuflen -= n; linebuflen -= n;
} }
if (have_to_map)
if (map_v4v6_hostent (result, &bp, &linebuflen))
goto too_small;
*h_errnop = NETDB_SUCCESS; *h_errnop = NETDB_SUCCESS;
return NSS_STATUS_SUCCESS; return NSS_STATUS_SUCCESS;
} }