Move getaddrinfo from 'posix' into 'nss'

getaddrinfo is an entry point for nss functionality.  This commit moves
it from 'sysdeps/posix' to 'nss', gets rid of the stub in 'posix', and
moves all associated tests as well.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 0 insertions, 2625 deletions

diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
deleted file mode 100644
index 531124958d..0000000000
--- a/sysdeps/posix/getaddrinfo.c
+++ /dev/null
@@ -1,2625 +0,0 @@
-/* Host and service name lookups using Name Service Switch modules.
-   Copyright (C) 1996-2023 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; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-/* The Inner Net License, Version 2.00
-
-  The author(s) grant permission for redistribution and use in source and
-binary forms, with or without modification, of the software and documentation
-provided that the following conditions are met:
-
-0. If you receive a version of the software that is specifically labelled
-   as not being for redistribution (check the version message and/or README),
-   you are not permitted to redistribute that version of the software in any
-   way or form.
-1. All terms of the all other applicable copyrights and licenses must be
-   followed.
-2. Redistributions of source code must retain the authors' copyright
-   notice(s), this list of conditions, and the following disclaimer.
-3. Redistributions in binary form must reproduce the authors' copyright
-   notice(s), this list of conditions, and the following disclaimer in the
-   documentation and/or other materials provided with the distribution.
-4. [The copyright holder has authorized the removal of this clause.]
-5. Neither the name(s) of the author(s) 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 ITS AUTHORS 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 AUTHORS 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.
-
-  If these license terms cause you a real problem, contact the author.  */
-
-/* This software is Copyright 1996 by Craig Metz, All Rights Reserved.  */
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <ifaddrs.h>
-#include <netdb.h>
-#include <nss.h>
-#include <resolv/resolv-internal.h>
-#include <resolv/resolv_context.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdio_ext.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdint.h>
-#include <arpa/inet.h>
-#include <net/if.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/un.h>
-#include <sys/utsname.h>
-#include <unistd.h>
-#include <nsswitch.h>
-#include <libc-lock.h>
-#include <not-cancel.h>
-#include <nscd/nscd-client.h>
-#include <nscd/nscd_proto.h>
-#include <scratch_buffer.h>
-#include <inet/net-internal.h>
-
-/* Former AI_IDN_ALLOW_UNASSIGNED and AI_IDN_USE_STD3_ASCII_RULES
-   flags, now ignored.  */
-#define DEPRECATED_AI_IDN 0x300
-
-#if IS_IN (libc)
-# define feof_unlocked(fp) __feof_unlocked (fp)
-#endif
-
-struct gaih_service
-  {
-    const char *name;
-    int num;
-  };
-
-struct gaih_servtuple
-  {
-    int socktype;
-    int protocol;
-    int port;
-    bool set;
-  };
-
-
-struct gaih_typeproto
-  {
-    int socktype;
-    int protocol;
-    uint8_t protoflag;
-    bool defaultflag;
-    char name[8];
-  };
-
-struct gaih_result
-{
-  struct gaih_addrtuple *at;
-  char *canon;
-  char *h_name;
-  bool free_at;
-  bool got_ipv6;
-};
-
-/* Values for `protoflag'.  */
-#define GAI_PROTO_NOSERVICE	1
-#define GAI_PROTO_PROTOANY	2
-
-static const struct gaih_typeproto gaih_inet_typeproto[] =
-{
-  { 0, 0, 0, false, "" },
-  { SOCK_STREAM, IPPROTO_TCP, 0, true, "tcp" },
-  { SOCK_DGRAM, IPPROTO_UDP, 0, true, "udp" },
-#if defined SOCK_DCCP && defined IPPROTO_DCCP
-  { SOCK_DCCP, IPPROTO_DCCP, 0, false, "dccp" },
-#endif
-#ifdef IPPROTO_UDPLITE
-  { SOCK_DGRAM, IPPROTO_UDPLITE, 0, false, "udplite" },
-#endif
-#ifdef IPPROTO_SCTP
-  { SOCK_STREAM, IPPROTO_SCTP, 0, false, "sctp" },
-  { SOCK_SEQPACKET, IPPROTO_SCTP, 0, false, "sctp" },
-#endif
-  { SOCK_RAW, 0, GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE, true, "raw" },
-  { 0, 0, 0, false, "" }
-};
-
-static const struct addrinfo default_hints =
-  {
-    .ai_flags = AI_DEFAULT,
-    .ai_family = PF_UNSPEC,
-    .ai_socktype = 0,
-    .ai_protocol = 0,
-    .ai_addrlen = 0,
-    .ai_addr = NULL,
-    .ai_canonname = NULL,
-    .ai_next = NULL
-  };
-
-static void
-gaih_result_reset (struct gaih_result *res)
-{
-  if (res->free_at)
-    free (res->at);
-  free (res->canon);
-  free (res->h_name);
-  memset (res, 0, sizeof (*res));
-}
-
-static int
-gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
-		const struct addrinfo *req, struct gaih_servtuple *st,
-		struct scratch_buffer *tmpbuf)
-{
-  struct servent *s;
-  struct servent ts;
-  int r;
-
-  do
-    {
-      r = __getservbyname_r (servicename, tp->name, &ts,
-			     tmpbuf->data, tmpbuf->length, &s);
-      if (r != 0 || s == NULL)
-	{
-	  if (r == ERANGE)
-	    {
-	      if (!scratch_buffer_grow (tmpbuf))
-		return -EAI_MEMORY;
-	    }
-	  else
-	    return -EAI_SERVICE;
-	}
-    }
-  while (r);
-
-  st->socktype = tp->socktype;
-  st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
-		  ? req->ai_protocol : tp->protocol);
-  st->port = s->s_port;
-  st->set = true;
-
-  return 0;
-}
-
-/* Convert struct hostent to a list of struct gaih_addrtuple objects.  The new
-   addresses are appended to the tuple array in RES.  */
-static bool
-convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
-				   struct hostent *h, struct gaih_result *res)
-{
-  /* Count the number of addresses in h->h_addr_list.  */
-  size_t count = 0;
-  for (char **p = h->h_addr_list; *p != NULL; ++p)
-    ++count;
-
-  /* Report no data if no addresses are available, or if the incoming
-     address size is larger than what we can store.  */
-  if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr))
-    return true;
-
-  struct gaih_addrtuple *array = res->at;
-  size_t old = 0;
-
-  while (array != NULL)
-    {
-      old++;
-      array = array->next;
-    }
-
-  array = realloc (res->at, (old + count) * sizeof (*array));
-
-  if (array == NULL)
-    return false;
-
-  res->got_ipv6 = family == AF_INET6;
-  res->at = array;
-  res->free_at = true;
-
-  /* Duplicate h_name because it may get reclaimed when the underlying storage
-     is freed.  */
-  if (res->h_name == NULL)
-    {
-      res->h_name = __strdup (h->h_name);
-      if (res->h_name == NULL)
-	return false;
-    }
-
-  /* Update the next pointers on reallocation.  */
-  for (size_t i = 0; i < old; i++)
-    array[i].next = array + i + 1;
-
-  array += old;
-
-  memset (array, 0, count * sizeof (*array));
-
-  for (size_t i = 0; i < count; ++i)
-    {
-      if (family == AF_INET && req->ai_family == AF_INET6)
-	{
-	  /* Perform address mapping. */
-	  array[i].family = AF_INET6;
-	  memcpy(array[i].addr + 3, h->h_addr_list[i], sizeof (uint32_t));
-	  array[i].addr[2] = htonl (0xffff);
-	}
-      else
-	{
-	  array[i].family = family;
-	  memcpy (array[i].addr, h->h_addr_list[i], h->h_length);
-	}
-      array[i].next = array + i + 1;
-    }
-  array[count - 1].next = NULL;
-
-  return true;
-}
-
-static int
-gethosts (nss_gethostbyname3_r fct, int family, const char *name,
-	  const struct addrinfo *req, struct scratch_buffer *tmpbuf,
-	  struct gaih_result *res, enum nss_status *statusp, int *no_datap)
-{
-  struct hostent th;
-  char *localcanon = NULL;
-  enum nss_status status;
-
-  *no_datap = 0;
-  while (1)
-    {
-      *statusp = status = DL_CALL_FCT (fct, (name, family, &th,
-					     tmpbuf->data, tmpbuf->length,
-					     &errno, &h_errno, NULL,
-					     &localcanon));
-      if (status != NSS_STATUS_TRYAGAIN || h_errno != NETDB_INTERNAL
-	  || errno != ERANGE)
-	break;
-      if (!scratch_buffer_grow (tmpbuf))
-	return -EAI_MEMORY;
-    }
-  if (status == NSS_STATUS_NOTFOUND
-      || status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL)
-    {
-      if (h_errno == NETDB_INTERNAL)
-	return -EAI_SYSTEM;
-      if (h_errno == TRY_AGAIN)
-	*no_datap = EAI_AGAIN;
-      else
-	*no_datap = h_errno == NO_DATA;
-    }
-  else if (status == NSS_STATUS_SUCCESS)
-    {
-      if (!convert_hostent_to_gaih_addrtuple (req, family, &th, res))
-	return -EAI_MEMORY;
-
-      if (localcanon != NULL && res->canon == NULL)
-	{
-	  char *canonbuf = __strdup (localcanon);
-	  if (canonbuf == NULL)
-	    return  -EAI_MEMORY;
-	  res->canon = canonbuf;
-	}
-    }
-
-  return 0;
-}
-
-/* This function is called if a canonical name is requested, but if
-   the service function did not provide it.  It tries to obtain the
-   name using getcanonname_r from the same service NIP.  If the name
-   cannot be canonicalized, return a copy of NAME.  Return NULL on
-   memory allocation failure.  The returned string is allocated on the
-   heap; the caller has to free it.  */
-static char *
-getcanonname (nss_action_list nip, const char *hname, const char *name)
-{
-  nss_getcanonname_r *cfct = __nss_lookup_function (nip, "getcanonname_r");
-  char *s = (char *) name;
-  if (cfct != NULL)
-    {
-      char buf[256];
-      if (DL_CALL_FCT (cfct, (hname ?: name, buf, sizeof (buf), &s, &errno,
-			      &h_errno)) != NSS_STATUS_SUCCESS)
-	/* If the canonical name cannot be determined, use the passed
-	   string.  */
-	s = (char *) name;
-    }
-  return __strdup (s);
-}
-
-/* Process looked up canonical name and if necessary, decode to IDNA.  Result
-   is a new string written to CANONP and the earlier string is freed.  */
-
-static int
-process_canonname (const struct addrinfo *req, const char *orig_name,
-		   struct gaih_result *res)
-{
-  char *canon = res->canon;
-
-  if ((req->ai_flags & AI_CANONNAME) != 0)
-    {
-      bool do_idn = req->ai_flags & AI_CANONIDN;
-      if (do_idn)
-	{
-	  char *out;
-	  int rc = __idna_from_dns_encoding (canon ?: orig_name, &out);
-	  if (rc == 0)
-	    {
-	      free (canon);
-	      canon = out;
-	    }
-	  else if (rc == EAI_IDN_ENCODE)
-	    /* Use the punycode name as a fallback.  */
-	    do_idn = false;
-	  else
-	    return -rc;
-	}
-      if (!do_idn && canon == NULL && (canon = __strdup (orig_name)) == NULL)
-	return -EAI_MEMORY;
-    }
-
-  res->canon = canon;
-  return 0;
-}
-
-static int
-get_servtuples (const struct gaih_service *service, const struct addrinfo *req,
-		struct gaih_servtuple *st, struct scratch_buffer *tmpbuf)
-{
-  int i;
-  const struct gaih_typeproto *tp = gaih_inet_typeproto;
-
-  if (req->ai_protocol || req->ai_socktype)
-    {
-      ++tp;
-
-      while (tp->name[0]
-	     && ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype)
-		 || (req->ai_protocol != 0
-		     && !(tp->protoflag & GAI_PROTO_PROTOANY)
-		     && req->ai_protocol != tp->protocol)))
-	++tp;
-
-      if (! tp->name[0])
-	{
-	  if (req->ai_socktype)
-	    return -EAI_SOCKTYPE;
-	  else
-	    return -EAI_SERVICE;
-	}
-    }
-
-  if (service != NULL && (tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
-    return -EAI_SERVICE;
-
-  if (service == NULL || service->num >= 0)
-    {
-      int port = service != NULL ? htons (service->num) : 0;
-
-      if (req->ai_socktype || req->ai_protocol)
-	{
-	  st[0].socktype = tp->socktype;
-	  st[0].protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
-			  ? req->ai_protocol : tp->protocol);
-	  st[0].port = port;
-	  st[0].set = true;
-
-	  return 0;
-	}
-
-      /* Neither socket type nor protocol is set.  Return all socket types
-	 we know about.  */
-      for (i = 0, ++tp; tp->name[0]; ++tp)
-	if (tp->defaultflag)
-	  {
-	    st[i].socktype = tp->socktype;
-	    st[i].protocol = tp->protocol;
-	    st[i].port = port;
-	    st[i++].set = true;
-	  }
-
-      return 0;
-    }
-
-  if (tp->name[0])
-    return gaih_inet_serv (service->name, tp, req, st, tmpbuf);
-
-  for (i = 0, tp++; tp->name[0]; tp++)
-    {
-      if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
-	continue;
-
-      if (req->ai_socktype != 0
-	  && req->ai_socktype != tp->socktype)
-	continue;
-      if (req->ai_protocol != 0
-	  && !(tp->protoflag & GAI_PROTO_PROTOANY)
-	  && req->ai_protocol != tp->protocol)
-	continue;
-
-      if (gaih_inet_serv (service->name,
-			  tp, req, &st[i], tmpbuf) != 0)
-	continue;
-
-      i++;
-    }
-
-  if (!st[0].set)
-    return -EAI_SERVICE;
-
-  return 0;
-}
-
-#ifdef USE_NSCD
-/* Query addresses from nscd cache, returning a non-zero value on error.
-   RES members have the lookup result; RES->AT is NULL if there were no errors
-   but also no results.  */
-
-static int
-get_nscd_addresses (const char *name, const struct addrinfo *req,
-		    struct gaih_result *res)
-{
-  if (__nss_not_use_nscd_hosts > 0
-      && ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY)
-    __nss_not_use_nscd_hosts = 0;
-
-  res->at = NULL;
-
-  if (__nss_not_use_nscd_hosts || __nss_database_custom[NSS_DBSIDX_hosts])
-    return 0;
-
-  /* Try to use nscd.  */
-  struct nscd_ai_result *air = NULL;
-  int err = __nscd_getai (name, &air, &h_errno);
-
-  if (__glibc_unlikely (air == NULL))
-    {
-      /* The database contains a negative entry.  */
-      if (err == 0)
-	return -EAI_NONAME;
-      if (__nss_not_use_nscd_hosts == 0)
-	{
-	  if (h_errno == NETDB_INTERNAL && errno == ENOMEM)
-	    return -EAI_MEMORY;
-	  if (h_errno == TRY_AGAIN)
-	    return -EAI_AGAIN;
-	  return -EAI_SYSTEM;
-	}
-      return 0;
-    }
-
-  /* Transform into gaih_addrtuple list.  */
-  int result = 0;
-  char *addrs = air->addrs;
-
-  struct gaih_addrtuple *addrfree = calloc (air->naddrs, sizeof (*addrfree));
-  struct gaih_addrtuple *at = calloc (air->naddrs, sizeof (*at));
-  if (at == NULL)
-    {
-      result = -EAI_MEMORY;
-      goto out;
-    }
-
-  res->free_at = true;
-
-  int count = 0;
-  for (int i = 0; i < air->naddrs; ++i)
-    {
-      socklen_t size = (air->family[i] == AF_INET
-			? INADDRSZ : IN6ADDRSZ);
-
-      if (!((air->family[i] == AF_INET
-	     && req->ai_family == AF_INET6
-	     && (req->ai_flags & AI_V4MAPPED) != 0)
-	    || req->ai_family == AF_UNSPEC
-	    || air->family[i] == req->ai_family))
-	{
-	  /* Skip over non-matching result.  */
-	  addrs += size;
-	  continue;
-	}
-
-      if (air->family[i] == AF_INET && req->ai_family == AF_INET6
-	  && (req->ai_flags & AI_V4MAPPED))
-	{
-	  at[count].family = AF_INET6;
-	  at[count].addr[3] = *(uint32_t *) addrs;
-	  at[count].addr[2] = htonl (0xffff);
-	}
-      else if (req->ai_family == AF_UNSPEC
-	       || air->family[i] == req->ai_family)
-	{
-	  at[count].family = air->family[i];
-	  memcpy (at[count].addr, addrs, size);
-	  if (air->family[i] == AF_INET6)
-	    res->got_ipv6 = true;
-	}
-      at[count].next = at + count + 1;
-      count++;
-      addrs += size;
-    }
-
-  if ((req->ai_flags & AI_CANONNAME) && air->canon != NULL)
-    {
-      char *canonbuf = __strdup (air->canon);
-      if (canonbuf == NULL)
-	{
-	  result = -EAI_MEMORY;
-	  goto out;
-	}
-      res->canon = canonbuf;
-    }
-
-  if (count == 0)
-    {
-      result = -EAI_NONAME;
-      goto out;
-    }
-
-  at[count - 1].next = NULL;
-
-  res->at = at;
-
-out:
-  free (air);
-  if (result != 0)
-    {
-      free (at);
-      res->free_at = false;
-    }
-
-  return result;
-}
-#endif
-
-static int
-get_nss_addresses (const char *name, const struct addrinfo *req,
-		   struct scratch_buffer *tmpbuf, struct gaih_result *res)
-{
-  int no_data = 0;
-  int no_inet6_data = 0;
-  nss_action_list nip;
-  enum nss_status inet6_status = NSS_STATUS_UNAVAIL;
-  enum nss_status status = NSS_STATUS_UNAVAIL;
-  int no_more;
-  struct resolv_context *res_ctx = NULL;
-  bool do_merge = false;
-  int result = 0;
-
-  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
-     addresses to IPv6 addresses, so we use the no_inet6
-     function variant.  */
-  res_ctx = __resolv_context_get ();
-  if (res_ctx == NULL)
-    no_more = 1;
-
-  while (!no_more)
-    {
-      /* Always start afresh; continue should discard previous results
-	 and the hosts database does not support merge.  */
-      gaih_result_reset (res);
-
-      if (do_merge)
-	{
-	  __set_h_errno (NETDB_INTERNAL);
-	  __set_errno (EBUSY);
-	  break;
-	}
-
-      no_data = 0;
-      nss_gethostbyname4_r *fct4 = NULL;
-
-      /* gethostbyname4_r sends out parallel A and AAAA queries and
-	 is thus only suitable for PF_UNSPEC.  */
-      if (req->ai_family == PF_UNSPEC)
-	fct4 = __nss_lookup_function (nip, "gethostbyname4_r");
-
-      if (fct4 != NULL)
-	{
-	  while (1)
-	    {
-	      status = DL_CALL_FCT (fct4, (name, &res->at,
-					   tmpbuf->data, tmpbuf->length,
-					   &errno, &h_errno,
-					   NULL));
-	      if (status == NSS_STATUS_SUCCESS)
-		break;
-	      /* gethostbyname4_r may write into AT, so reset it.  */
-	      res->at = NULL;
-	      if (status != NSS_STATUS_TRYAGAIN
-		  || errno != ERANGE || h_errno != NETDB_INTERNAL)
-		{
-		  if (h_errno == TRY_AGAIN)
-		    no_data = EAI_AGAIN;
-		  else
-		    no_data = h_errno == NO_DATA;
-		  break;
-		}
-
-	      if (!scratch_buffer_grow (tmpbuf))
-		{
-		  __resolv_context_put (res_ctx);
-		  result = -EAI_MEMORY;
-		  goto out;
-		}
-	    }
-
-	  if (status == NSS_STATUS_SUCCESS)
-	    {
-	      assert (!no_data);
-	      no_data = 1;
-
-	      if ((req->ai_flags & AI_CANONNAME) != 0 && res->canon == NULL)
-		{
-		  char *canonbuf = __strdup (res->at->name);
-		  if (canonbuf == NULL)
-		    {
-		      __resolv_context_put (res_ctx);
-		      result = -EAI_MEMORY;
-		      goto out;
-		    }
-		  res->canon = canonbuf;
-		}
-
-	      struct gaih_addrtuple **pat = &res->at;
-
-	      while (*pat != NULL)
-		{
-		  if ((*pat)->family == AF_INET
-		      && req->ai_family == AF_INET6
-		      && (req->ai_flags & AI_V4MAPPED) != 0)
-		    {
-		      uint32_t *pataddr = (*pat)->addr;
-		      (*pat)->family = AF_INET6;
-		      pataddr[3] = pataddr[0];
-		      pataddr[2] = htonl (0xffff);
-		      pataddr[1] = 0;
-		      pataddr[0] = 0;
-		      pat = &((*pat)->next);
-		      no_data = 0;
-		    }
-		  else if (req->ai_family == AF_UNSPEC
-			   || (*pat)->family == req->ai_family)
-		    {
-		      pat = &((*pat)->next);
-
-		      no_data = 0;
-		      if (req->ai_family == AF_INET6)
-			res->got_ipv6 = true;
-		    }
-		  else
-		    *pat = ((*pat)->next);
-		}
-	    }
-
-	  no_inet6_data = no_data;
-	}
-      else
-	{
-	  nss_gethostbyname3_r *fct = NULL;
-	  if (req->ai_flags & AI_CANONNAME)
-	    /* No need to use this function if we do not look for
-	       the canonical name.  The function does not exist in
-	       all NSS modules and therefore the lookup would
-	       often fail.  */
-	    fct = __nss_lookup_function (nip, "gethostbyname3_r");
-	  if (fct == NULL)
-	    /* We are cheating here.  The gethostbyname2_r
-	       function does not have the same interface as
-	       gethostbyname3_r but the extra arguments the
-	       latter takes are added at the end.  So the
-	       gethostbyname2_r code will just ignore them.  */
-	    fct = __nss_lookup_function (nip, "gethostbyname2_r");
-
-	  if (fct != NULL)
-	    {
-	      if (req->ai_family == AF_INET6
-		  || req->ai_family == AF_UNSPEC)
-		{
-		  if ((result = gethosts (fct, AF_INET6, name, req, tmpbuf,
-					  res, &status, &no_data)) != 0)
-		    {
-		      __resolv_context_put (res_ctx);
-		      goto out;
-		    }
-		  no_inet6_data = no_data;
-		  inet6_status = status;
-		}
-	      if (req->ai_family == AF_INET
-		  || req->ai_family == AF_UNSPEC
-		  || (req->ai_family == AF_INET6
-		      && (req->ai_flags & AI_V4MAPPED)
-		      /* Avoid generating the mapped addresses if we
-			 know we are not going to need them.  */
-		      && ((req->ai_flags & AI_ALL) || !res->got_ipv6)))
-		{
-		  if ((resu