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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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24
nss/nss_files/files-hosts.c
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@@ -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;