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nss: fix nss_database_lookup2's alternate handling [BZ #27416] 

__nss_database_lookup2's extra arguments were left unused in the
nsswitch reloading patch set; this broke compat (default config
ignored) and shadow files (secondary name ignored) which relies on
these fallbacks.

This patch adds in the previous behavior by correcting the
initialization of the database list to reflect the fallbacks.  This
means that the nss_database_lookup2 interface no longer needs to be
passed the fallback info, so API and callers were adjusted.

Since all callers needed to be edited anyway, the calls were changed
from __nss_database_lookup2 to the faster __nss_database_get.  This
was an intended optimization which was deferred during the initial
lookup changes to avoid touching so many files.

The test case verifies that compat targets work (passwd) and that the
default configuration works (group).  Tested on x86-64.
This commit is contained in:
DJ Delorie 2021-02-15 21:34:23 -05:00
parent 24eb3be5db
commit 9b456c5da9
32 changed files with 252 additions and 105 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
nscd/aicache.c
View File

@ -77,9 +77,7 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req,
int rc4 = 0;
int herrno = 0;
no_more = __nss_database_lookup2 ("hosts", NULL,
"dns [!UNAVAIL=return] files",
&nip);
no_more = !__nss_database_get (nss_database_hosts, &nip);
/* Initialize configurations. */
struct resolv_context *ctx = __resolv_context_get ();

3
nscd/initgrcache.c
View File

@ -82,8 +82,7 @@ addinitgroupsX (struct database_dyn *db, int fd, request_header *req,
int no_more;
if (group_database == NULL)
no_more = __nss_database_lookup2 ("group", NULL, "files",
&group_database);
no_more = !__nss_database_get (nss_database_group, &group_database);
else
no_more = 0;
nip = group_database;

2
nscd/netgroupcache.c
View File

@ -143,7 +143,7 @@ addgetnetgrentX (struct database_dyn *db, int fd, request_header *req,
*tofreep = NULL;
if (netgroup_database == NULL
&& __nss_database_lookup2 ("netgroup", NULL, NULL, &netgroup_database))
&& !__nss_database_get (nss_database_netgroup, &netgroup_database))
{
/* No such service. */
cacheable = do_notfound (db, fd, req, key, &dataset, &total, &timeout,

1
nss/Makefile
View File

@ -63,6 +63,7 @@ tests = test-netdb test-digits-dots tst-nss-getpwent bug17079 \
xtests = bug-erange
tests-container = \
tst-nss-compat1 \
tst-nss-test3 \
tst-nss-files-hosts-long \
tst-nss-db-endpwent \

2
nss/Versions
View File

@ -17,7 +17,7 @@ libc {
__nss_passwd_lookup2; __nss_group_lookup2; __nss_hosts_lookup2;
__nss_services_lookup2; __nss_next2; __nss_lookup;
__nss_hash; __nss_database_lookup2;
__nss_hash; __nss_database_get;
__nss_files_fopen; __nss_readline; __nss_parse_line_result;
}
}

17
nss/XXX-lookup.c
View File

@ -37,27 +37,20 @@
#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
#define DATABASE_NAME_ID CONCAT2_1 (nss_database_, DATABASE_NAME)
#define CONCAT2_1(Pre, Name) CONCAT2_2 (Pre, Name)
#define CONCAT2_2(Pre, Name) Pre##Name
#define DATABASE_NAME_SYMBOL CONCAT3_1 (__nss_, DATABASE_NAME, _database)
#define DATABASE_NAME_STRING STRINGIFY1 (DATABASE_NAME)
#define STRINGIFY1(Name) STRINGIFY2 (Name)
#define STRINGIFY2(Name) #Name
#ifdef ALTERNATE_NAME
#define ALTERNATE_NAME_STRING STRINGIFY1 (ALTERNATE_NAME)
#else
#define ALTERNATE_NAME_STRING NULL
#endif
#ifndef DEFAULT_CONFIG
#define DEFAULT_CONFIG NULL
#endif
int
DB_LOOKUP_FCT (nss_action_list *ni, const char *fct_name, const char *fct2_name,
void **fctp)
{
if (__nss_database_lookup2 (DATABASE_NAME_STRING, ALTERNATE_NAME_STRING,
DEFAULT_CONFIG, &DATABASE_NAME_SYMBOL) < 0)
if (! __nss_database_get (DATABASE_NAME_ID, &DATABASE_NAME_SYMBOL))
return -1;
*ni = DATABASE_NAME_SYMBOL;

3
nss/databases.def
View File

@ -23,17 +23,20 @@
DEFINE_DATABASE (aliases)
DEFINE_DATABASE (ethers)
DEFINE_DATABASE (group)
DEFINE_DATABASE (group_compat)
DEFINE_DATABASE (gshadow)
DEFINE_DATABASE (hosts)
DEFINE_DATABASE (initgroups)
DEFINE_DATABASE (netgroup)
DEFINE_DATABASE (networks)
DEFINE_DATABASE (passwd)
DEFINE_DATABASE (passwd_compat)
DEFINE_DATABASE (protocols)
DEFINE_DATABASE (publickey)
DEFINE_DATABASE (rpc)
DEFINE_DATABASE (services)
DEFINE_DATABASE (shadow)
DEFINE_DATABASE (shadow_compat)
/*
Local Variables:

1
nss/grp-lookup.c
View File

@ -19,6 +19,5 @@
#include <config.h>
#define DATABASE_NAME group
#define DEFAULT_CONFIG "files"
#include "XXX-lookup.c"

1
nss/hosts-lookup.c
View File

@ -17,6 +17,5 @@
<https://www.gnu.org/licenses/>. */
#define DATABASE_NAME hosts
#define DEFAULT_CONFIG "dns [!UNAVAIL=return] files"
#include "XXX-lookup.c"

1
nss/key-lookup.c
View File

@ -17,6 +17,5 @@
<https://www.gnu.org/licenses/>. */
#define DATABASE_NAME publickey
#define DEFAULT_CONFIG "nis nisplus"
#include "XXX-lookup.c"

1
nss/network-lookup.c
View File

@ -17,6 +17,5 @@
<https://www.gnu.org/licenses/>. */
#define DATABASE_NAME networks
#define DEFAULT_CONFIG "dns [!UNAVAIL=return] files"
#include "XXX-lookup.c"

2
nss/nss_compat/compat-grp.c
View File

@ -81,7 +81,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup2 ("group_compat", NULL, "nis", &ni) >= 0)
if (__nss_database_get (nss_database_group_compat, &ni))
{
setgrent_impl = __nss_lookup_function (ni, "setgrent");
getgrnam_r_impl = __nss_lookup_function (ni, "getgrnam_r");

2
nss/nss_compat/compat-initgroups.c
View File

@ -91,7 +91,7 @@ init_nss_interface (void)
/* Retest. */
if (ni == NULL
&& __nss_database_lookup2 ("group_compat", NULL, "nis", &ni) >= 0)
&& __nss_database_get (nss_database_group_compat, &ni))
{
initgroups_dyn_impl = __nss_lookup_function (ni, "initgroups_dyn");
getgrnam_r_impl = __nss_lookup_function (ni, "getgrnam_r");

2
nss/nss_compat/compat-pwd.c
View File

@ -91,7 +91,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup2 ("passwd_compat", NULL, "nis", &ni) >= 0)
if (__nss_database_get (nss_database_passwd_compat, &ni))
{
setpwent_impl = __nss_lookup_function (ni, "setpwent");
getpwnam_r_impl = __nss_lookup_function (ni, "getpwnam_r");

3
nss/nss_compat/compat-spwd.c
View File

@ -88,8 +88,7 @@ static bool in_blacklist (const char *, int, ent_t *);
static void
init_nss_interface (void)
{
if (__nss_database_lookup2 ("shadow_compat", "passwd_compat",
"nis", &ni) >= 0)
if (__nss_database_get (nss_database_shadow_compat, &ni))
{
setspent_impl = __nss_lookup_function (ni, "setspent");
getspnam_r_impl = __nss_lookup_function (ni, "getspnam_r");

38
nss/nss_database.c
View File

@ -93,13 +93,16 @@ enum nss_database_default
static const char per_database_defaults[NSS_DATABASE_COUNT] =
{
[nss_database_group] = nss_database_default_compat,
[nss_database_group_compat] = nss_database_default_nis,
[nss_database_gshadow] = nss_database_default_files,
[nss_database_hosts] = nss_database_default_dns,
[nss_database_initgroups] = nss_database_default_none,
[nss_database_networks] = nss_database_default_dns,
[nss_database_passwd] = nss_database_default_compat,
[nss_database_passwd_compat] = nss_database_default_nis,
[nss_database_publickey] = nss_database_default_nis_nisplus,
[nss_database_shadow] = nss_database_default_compat,
[nss_database_shadow_compat] = nss_database_default_nis,
};
struct nss_database_default_cache
@ -166,13 +169,12 @@ nss_database_select_default (struct nss_database_default_cache *cache,
assert (errno == ENOMEM);
return false;
}
else
return true;
return true;
}
/* database_name must be large enough for each individual name plus a
null terminator. */
typedef char database_name[11];
typedef char database_name[14];
#define DEFINE_DATABASE(name) \
_Static_assert (sizeof (#name) <= sizeof (database_name), #name);
#include "databases.def"
@ -323,14 +325,43 @@ nss_database_reload (struct nss_database_data *staging,
/* No other threads have access to fp. */
__fsetlocking (fp, FSETLOCKING_BYCALLER);
/* We start with all of *staging pointing to NULL. */
bool ok = true;
if (fp != NULL)
ok = nss_database_reload_1 (staging, fp);
/* Now we have non-NULL entries where the user explictly listed the
service in nsswitch.conf. */
/* Apply defaults. */
if (ok)
{
struct nss_database_default_cache cache = { };
/* These three default to other services if the user listed the
other service. */
/* "shadow_compat" defaults to "passwd_compat" if only the
latter is given. */
if (staging->services[nss_database_shadow_compat] == NULL)
staging->services[nss_database_shadow_compat] =
staging->services[nss_database_passwd_compat];
/* "shadow" defaults to "passwd" if only the latter is
given. */
if (staging->services[nss_database_shadow] == NULL)
staging->services[nss_database_shadow] =
staging->services[nss_database_passwd];
/* "gshadow" defaults to "group" if only the latter is
given. */
if (staging->services[nss_database_gshadow] == NULL)
staging->services[nss_database_gshadow] =
staging->services[nss_database_group];
/* For anything still unspecified, load the default configs. */
for (int i = 0; i < NSS_DATABASE_COUNT; ++i)
if (staging->services[i] == NULL)
{
@ -440,6 +471,7 @@ __nss_database_get (enum nss_database db, nss_action_list *actions)
struct nss_database_state *local = nss_database_state_get ();
return nss_database_check_reload_and_get (local, actions, db);
}
libc_hidden_def (__nss_database_get)
nss_action_list
__nss_database_get_noreload (enum nss_database db)

5
nss/nss_database.h
View File

@ -52,12 +52,11 @@ enum nss_database
NSS_DATABASE_COUNT
};
/* Looks up the action list for DB and stores it in *ACTIONS. Returns
true on success or false on failure. Success can mean that
*ACTIONS is NULL. */
bool __nss_database_get (enum nss_database db, nss_action_list *actions)
attribute_hidden;
bool __nss_database_get (enum nss_database db, nss_action_list *actions);
libc_hidden_proto (__nss_database_get)
/* Like __nss_database_get, but does not reload /etc/nsswitch.conf
from disk. This assumes that there has been a previous successful

20
nss/nss_module.c
View File

@ -31,14 +31,6 @@
#include <stdlib.h>
#include <string.h>
#ifdef LINK_OBSOLETE_NSL
# define DEFAULT_CONFIG "compat [NOTFOUND=return] files"
# define DEFAULT_DEFCONFIG "nis [NOTFOUND=return] files"
#else
# define DEFAULT_CONFIG "files"
# define DEFAULT_DEFCONFIG "files"
#endif
/* Suffix after .so of NSS service modules. This is a bit of magic,
but we assume LIBNSS_FILES_SO looks like "libnss_files.so.2" and we
want a pointer to the ".2" part. We have no API to extract this
@ -292,11 +284,11 @@ __nss_module_get_function (struct nss_module *module, const char *name)
#if defined SHARED && defined USE_NSCD
/* Load all libraries for the service. */
static void
nss_load_all_libraries (const char *service, const char *def)
nss_load_all_libraries (enum nss_database service)
{
nss_action_list ni = NULL;
if (__nss_database_lookup2 (service, NULL, def, &ni) == 0)
if (__nss_database_get (service, &ni))
while (ni->module != NULL)
{
__nss_module_load (ni->module);
@ -323,10 +315,10 @@ __nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
is_nscd = true;
/* Find all the relevant modules so that the init functions are called. */
nss_load_all_libraries ("passwd", DEFAULT_CONFIG);
nss_load_all_libraries ("group", DEFAULT_CONFIG);
nss_load_all_libraries ("hosts", "dns [!UNAVAIL=return] files");
nss_load_all_libraries ("services", NULL);
nss_load_all_libraries (nss_database_passwd);
nss_load_all_libraries (nss_database_group);
nss_load_all_libraries (nss_database_hosts);
nss_load_all_libraries (nss_database_services);
/* Make sure NSCD purges its cache if nsswitch.conf changes. */
init_traced_file (&pwd_traced_file.file, _PATH_NSSWITCH_CONF, 0);

7
nss/nss_test.h
View File

@ -33,11 +33,13 @@
#include <pwd.h>
#include <grp.h>
#include <shadow.h>
#include <netdb.h>
typedef struct test_tables {
struct passwd *pwd_table;
struct group *grp_table;
struct spwd *spwd_table;
struct hostent *host_table;
} test_tables;
@ -46,10 +48,12 @@ extern void _nss_test2_init_hook (test_tables *) __attribute__((weak));
#define PWD_LAST() { .pw_name = NULL, .pw_uid = 0 }
#define GRP_LAST() { .gr_name = NULL, .gr_gid = 0 }
#define SPWD_LAST() { .sp_namp = NULL, .sp_pwdp = NULL }
#define HOST_LAST() { .h_name = NULL, .h_aliases = NULL, .h_length = 0, .h_addr_list = NULL }
#define PWD_ISLAST(p) ((p)->pw_name == NULL && (p)->pw_uid == 0)
#define GRP_ISLAST(g) ((g)->gr_name == NULL && (g)->gr_gid == 0)
#define SPWD_ISLAST(s) ((s)->sp_namp == NULL && (s)->sp_pwdp == 0)
#define HOST_ISLAST(h) ((h)->h_name == NULL && (h)->h_length == 0)
/* Macros to fill in the tables easily. */
@ -76,6 +80,9 @@ extern void _nss_test2_init_hook (test_tables *) __attribute__((weak));
{ .gr_name = (char *) n, .gr_passwd = (char *) "*", .gr_gid = u, \
.gr_mem = (char **) m }
#define SPWD(u) \
{ .sp_namp = (char *) "name" #u, .sp_pwdp = (char *) "passwd" #u }
#define HOST(u) \
{ .h_name = (char *) "name" #u, .h_aliases = NULL, .h_addrtype = u, \
.h_length = 4, \

93
nss/nss_test1.c
View File

@ -66,6 +66,9 @@ static int npwd_data = default_npwd_data;
static struct group *grp_data = NULL;
static int ngrp_data = 0;
static struct spwd *spwd_data = NULL;
static int nspwd_data = 0;
static struct hostent *host_data = NULL;
static int nhost_data = 0;
@ -102,6 +105,13 @@ init(void)
;
ngrp_data = i;
}
if (t.spwd_table)
{
spwd_data = t.spwd_table;
for (i=0; ! SPWD_ISLAST(& spwd_data[i]); i++)
;
nspwd_data = i;
}
if (t.host_table)
{
host_data = t.host_table;
@ -323,6 +333,89 @@ NAME(getgrnam_r) (const char *name, struct group *result, char *buffer,
return NSS_STATUS_NOTFOUND;
}
/* -------------------------------------------------- */
/* Shadow password handling. */
static size_t spwd_iter;
#define CURSPWD spwd_data[spwd_iter]
static pthread_mutex_t spwd_lock = PTHREAD_MUTEX_INITIALIZER;
enum nss_status
NAME(setspent) (int stayopen)
{
init();
spwd_iter = 0;
return NSS_STATUS_SUCCESS;
}
enum nss_status
NAME(endspwent) (void)
{
init();
return NSS_STATUS_SUCCESS;
}
static enum nss_status
copy_shadow (struct spwd *result, struct spwd *local,
char *buffer, size_t buflen, int *errnop)
{
struct alloc_buffer buf = alloc_buffer_create (buffer, buflen);
result->sp_namp = alloc_buffer_maybe_copy_string (&buf, local->sp_namp);
result->sp_pwdp = alloc_buffer_maybe_copy_string (&buf, local->sp_pwdp);
result->sp_lstchg = local->sp_lstchg;
result->sp_min = local->sp_min;
result->sp_max = local->sp_max;
result->sp_warn = local->sp_warn;
result->sp_inact = local->sp_inact;
result->sp_expire = local->sp_expire;
result->sp_flag = local->sp_flag;
if (alloc_buffer_has_failed (&buf))
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
NAME(getspent_r) (struct spwd *result, char *buffer, size_t buflen,
int *errnop)
{
int res = NSS_STATUS_SUCCESS;
init();
pthread_mutex_lock (&spwd_lock);
if (spwd_iter >= nspwd_data)
res = NSS_STATUS_NOTFOUND;
else
{
res = copy_shadow (result, &CURSPWD, buffer, buflen, errnop);
++spwd_iter;
}
pthread_mutex_unlock (&spwd_lock);
return res;
}
enum nss_status
NAME(getspnam_r) (const char *name, struct spwd *result, char *buffer,
size_t buflen, int *errnop)
{
init();
for (size_t idx = 0; idx < nspwd_data; ++idx)
if (strcmp (spwd_data[idx].sp_namp, name) == 0)
return copy_shadow (result, &spwd_data[idx], buffer, buflen, errnop);
return NSS_STATUS_NOTFOUND;
}
/* -------------------------------------------------- */
/* Host handling. */

40
nss/nsswitch.c
View File

@ -51,53 +51,13 @@
#undef DEFINE_DATABASE
#undef DEFINE_DATABASE
#define DEFINE_DATABASE(name) #name,
static const char * database_names[] = {
#include "databases.def"
NULL
};
#ifdef USE_NSCD
/* Flags whether custom rules for database is set. */
bool __nss_database_custom[NSS_DBSIDX_max];
#endif
/*__libc_lock_define_initialized (static, lock)*/
/* -1 == database not found
0 == database entry pointer stored */
int
__nss_database_lookup2 (const char *database, const char *alternate_name,
const char *defconfig, nss_action_list *ni)
{
int database_id;
for (database_id = 0; database_names[database_id]; database_id++)
if (strcmp (database_names[database_id], database) == 0)
break;
if (database_names[database_id] == NULL)
return -1;
/* If *NI is NULL, the database was not mentioned in nsswitch.conf.
If *NI is not NULL, but *NI->module is NULL, the database was in
nsswitch.conf but listed no actions. We test for the former. */
if (__nss_database_get (database_id, ni) && *ni != NULL)
{
/* Success. */
return 0;
}
else
{
/* Failure. */
return -1;
}
}
libc_hidden_def (__nss_database_lookup2)
/* -1 == not found
0 == function found
1 == finished */

9
nss/nsswitch.h
View File

@ -88,15 +88,6 @@ extern bool __nss_database_custom[NSS_DBSIDX_max] attribute_hidden;
/* Interface functions for NSS. */
/* Get the data structure representing the specified database.
If there is no configuration for this database in the file,
parse a service list from DEFCONFIG and use that. More
than one function can use the database. */
extern int __nss_database_lookup2 (const char *database,
const char *alternative_name,
const char *defconfig, struct nss_action **ni);
libc_hidden_proto (__nss_database_lookup2)
/* Put first function with name FCT_NAME for SERVICE in FCTP. The
position is remembered in NI. The function returns a value < 0 if
an error occurred or no such function exists. */

1
nss/pwd-lookup.c
View File

@ -19,6 +19,5 @@
#include <config.h>
#define DATABASE_NAME passwd
#define DEFAULT_CONFIG "files"
#include "XXX-lookup.c"

2
nss/sgrp-lookup.c
View File

@ -17,7 +17,5 @@
<https://www.gnu.org/licenses/>. */
#define DATABASE_NAME gshadow
#define ALTERNATE_NAME group
#define DEFAULT_CONFIG "files"
#include "XXX-lookup.c"

2
nss/spwd-lookup.c
View File

@ -19,7 +19,5 @@
#include <config.h>
#define DATABASE_NAME shadow
#define ALTERNATE_NAME passwd
#define DEFAULT_CONFIG "files"
#include "XXX-lookup.c"

81
nss/tst-nss-compat1.c Normal file
View File

@ -0,0 +1,81 @@
/* Test error checking for group entries.
Copyright (C) 2021 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <shadow.h>
#include <support/support.h>
#include <support/check.h>
#include "nss_test.h"
static struct passwd pwd_table[] = {
PWD (100),
PWD (30),
PWD_LAST ()
};
static struct spwd spwd_table[] = {
SPWD (100),
SPWD (30),
SPWD_LAST ()
};
void
_nss_test1_init_hook(test_tables *t)
{
t->pwd_table = pwd_table;
t->spwd_table = spwd_table;
}
static int
do_test (void)
{
struct passwd *p = NULL;
struct spwd *s = NULL;
struct group *g = NULL;
/* Test that compat-to-test works. */
p = getpwuid (100);
if (p == NULL)
FAIL_EXIT1("getpwuid-compat-test1 p");
else if (strcmp (p->pw_name, "name100") != 0)
FAIL_EXIT1("getpwuid-compat-test1 name100");
/* Shadow compat should use passwd via the alternate name. */
s = getspnam ("name30");
if (s == NULL)
FAIL_EXIT1("getspnam-compat-test1 s");
else if (strcmp (s->sp_namp, "name30") != 0)
FAIL_EXIT1("getpwuid-compat-test1 name30");
/* Test that internal defconfig works. */
g = getgrgid (100);
if (g == NULL)
FAIL_EXIT1("getgrgid-compat-null");
if (strcmp (g->gr_name, "wilma") != 0)
FAIL_EXIT1("getgrgid-compat-name");
return 0;
}
#include <support/test-driver.c>

1
nss/tst-nss-compat1.root/etc/group Normal file
View File

@ -0,0 +1 @@
wilma:x:100:

3
nss/tst-nss-compat1.root/etc/nsswitch.conf Normal file
View File

@ -0,0 +1,3 @@
passwd : compat
passwd_compat : test1

3
nss/tst-nss-compat1.root/etc/passwd Normal file
View File

@ -0,0 +1,3 @@
name5:x:5:555:name5 for testing:/home/name5:/bin/nologin
+name100
+name30

2
nss/tst-nss-compat1.root/etc/shadow Normal file
View File

@ -0,0 +1,2 @@
+name100
+name30

1
nss/tst-nss-compat1.root/tst-nss-compat1.script Normal file
View File

@ -0,0 +1 @@
cp $B/nss/libnss_test1.so $L/libnss_test1.so.2

4
sysdeps/posix/getaddrinfo.c
View File

@ -720,9 +720,7 @@ gaih_inet (const char *name, const struct gaih_service *service,
}
#endif
no_more = __nss_database_lookup2 ("hosts", NULL,
"dns [!UNAVAIL=return] files",
&nip);
no_more = !__nss_database_get (nss_database_hosts, &nip);
/* If we are looking for both IPv4 and IPv6 address we don't
want the lookup functions to automatically promote IPv4