* include/resolv.h: Adjust __libc_res_nquery and __libc_res_nsend

	prototypes.
	* include/arpa/nameser_compat.h: Define T_UNSPEC.
	* nis/Versions (libnss_nis): Export _nss_nis_gethostbyname4_r.
	(libnss_nisplus): Export _nss_nisplus_gethostbyname4_r.
	* nis/nss_nis/nis-hosts.c (LINE_PARSER): Change to also handle
	af==AF_UNSPEC.
	(_nss_nis_gethostbyname4_r): New function.
	* nis/nss_nisplus/nisplus-hosts.c (_nss_nisplus_parse_hostent):
	Change to also handle af==AF_UNSPEC.
	(get_tablename): New function.  Use it to avoid duplication.
	(_nss_nisplus_gethostbyname4_r): New function.
	* nscd/aicache.c (addhstaiX): Use gethostbyname4_r function is
	available.
	* nss/Versions (libnss_files): Export _nss_files_gethostbyname4_r.
	* nss/nss.h: Define struct gaih_addrtuple.
	* nss/nss_files/files-hosts.c (LINE_PARSER): Change to also handle
	af==AF_UNSPEC.
	(_nss_files_gethostbyname4_r): New function.
	* resolv/Versions (libnss_dns): Export _nss_dns_gethostbyname4_r.
	* resolv/gethnmaddr.c: Adjust __libc_res_nsearch and __libc_res_nquery
	calls.
	* resolv/res_query.c (__libc_res_nquery): Take two additional
	parameters for second answer buffer.  Handle type=T_UNSPEC to mean
	look up IPv4 and IPv6.
	Change all callers.
	* resolv/res_send.c (__libc_res_nsend): Take five aditional parameters
	for an additional query and answer buffer.  Pass to send_vc and
	send_dg.
	(send_vc): Send possibly two requests and receive two answers.
	(send_dg): Likewise.
	* resolv/nss_dns/dns-host.c: Adjust calls to __libc_res_nsearch and
	__libc_res_nquery.
	(_nss_dns_gethostbyname4_r): New function.
	(gaih_getanswer_slice): Likewise.
	(gaih_getanswer): Likewise.
	* resolv/nss_dns/dns-canon.c (_nss_dns_getcanonname_r): Adjust
	__libc_res_nquery call.
	* resolv/nss_dns/dns-network.c (_nss_dns_getnetbyaddr_r): Likewise.
	(_nss_dns_getnetbyname_r): Adjust __libc_res_nsearch call.
	* sysdeps/posix/getaddrinfo.c: Use gethostbyname4_r function is
	available.

3 files changed, 254 insertions, 89 deletions

diff --git a/nis/Versions b/nis/Versions
index be4453e285..ef9a512417 100644
--- a/nis/Versions
+++ b/nis/Versions
@@ -95,7 +95,7 @@ libnss_nis {
     _nss_nis_setgrent; _nss_nis_sethostent; _nss_nis_setnetent;
     _nss_nis_setnetgrent; _nss_nis_setprotoent; _nss_nis_setpwent;
     _nss_nis_setrpcent; _nss_nis_setservent; _nss_nis_setspent;
-    _nss_nis_initgroups_dyn;
+    _nss_nis_initgroups_dyn; _nss_nis_gethostbyname4_r;
   }
 }
 
@@ -126,5 +126,6 @@ libnss_nisplus {
     _nss_nisplus_setnetent; _nss_nisplus_setnetgrent; _nss_nisplus_setprotoent;
     _nss_nisplus_setpwent; _nss_nisplus_setrpcent; _nss_nisplus_setservent;
     _nss_nisplus_setspent; _nss_nisplus_initgroups_dyn;
+    _nss_nisplus_gethostbyname4_r;
   }
 }
diff --git a/nis/nss_nis/nis-hosts.c b/nis/nss_nis/nis-hosts.c
index 7bf4af786d..24d13634d7 100644
--- a/nis/nss_nis/nis-hosts.c
+++ b/nis/nss_nis/nis-hosts.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996-2000, 2002, 2003, 2006, 2007 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2000, 2002, 2003, 2006, 2007, 2008
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
 
@@ -17,6 +18,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <assert.h>
 #include <nss.h>
 #include <ctype.h>
 /* The following is an ugly trick to avoid a prototype declaration for
@@ -61,9 +63,12 @@ LINE_PARSER
 
    STRING_FIELD (addr, isspace, 1);
 
+   assert (af == AF_INET || af == AF_INET6 || af == AF_UNSPEC);
+
    /* Parse address.  */
-   if (af == AF_INET && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
+   if (af != AF_INET6 && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
      {
+       assert ((flags & AI_V4MAPPED) == 0 || af != AF_UNSPEC);
        if (flags & AI_V4MAPPED)
          {
            map_v4v6_address ((char *) entdata->host_addr,
@@ -77,7 +82,7 @@ LINE_PARSER
            result->h_length = INADDRSZ;
          }
      }
-   else if (af == AF_INET6
+   else if (af != AF_INET
             && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
      {
        result->h_addrtype = AF_INET6;
@@ -102,6 +107,7 @@ static bool_t new_start = 1;
 static char *oldkey = NULL;
 static int oldkeylen = 0;
 
+
 enum nss_status
 _nss_nis_sethostent (int stayopen)
 {
@@ -124,6 +130,7 @@ _nss_nis_sethostent (int stayopen)
    is used so this makes no difference.  */
 strong_alias (_nss_nis_sethostent, _nss_nis_endhostent)
 
+
 /* The calling function always need to get a lock first. */
 static enum nss_status
 internal_nis_gethostent_r (struct hostent *host, char *buffer,
@@ -216,6 +223,7 @@ internal_nis_gethostent_r (struct hostent *host, char *buffer,
   return NSS_STATUS_SUCCESS;
 }
 
+
 enum nss_status
 _nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen,
 		       int *errnop, int *h_errnop)
@@ -233,6 +241,7 @@ _nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen,
   return status;
 }
 
+
 static enum nss_status
 internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
 			   char *buffer, size_t buflen, int *errnop,
@@ -323,16 +332,24 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
   return NSS_STATUS_SUCCESS;
 }
 
+
 enum nss_status
 _nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host,
 			   char *buffer, size_t buflen, int *errnop,
 			   int *h_errnop)
 {
+  if (af != AF_INET && af != AF_INET6)
+    {
+      *h_errnop = HOST_NOT_FOUND;
+      return NSS_STATUS_NOTFOUND;
+    }
+
   return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
 				    h_errnop,
 		        ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
 }
 
+
 enum nss_status
 _nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer,
 			  size_t buflen, int *errnop, int *h_errnop)
@@ -351,6 +368,7 @@ _nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer,
 				    errnop, h_errnop, 0);
 }
 
+
 enum nss_status
 _nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
 			  struct hostent *host, char *buffer, size_t buflen,
@@ -430,13 +448,93 @@ _nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
   return NSS_STATUS_SUCCESS;
 }
 
-#if 0
+
 enum nss_status
-_nss_nis_getipnodebyname_r (const char *name, int af, int flags,
-			    struct hostent *result, char *buffer,
-			    size_t buflen, int *errnop, int *herrnop)
+_nss_nis_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
+			   char *buffer, size_t buflen, int *errnop,
+			   int *herrnop, int32_t *ttlp)
 {
-  return internal_gethostbyname2_r (name, af, result, buffer, buflen,
-				    errnop, herrnop, flags);
+  char *domain;
+  if (yp_get_default_domain (&domain))
+    return NSS_STATUS_UNAVAIL;
+
+  /* Convert name to lowercase.  */
+  size_t namlen = strlen (name);
+  char name2[namlen + 1];
+  size_t i;
+
+  for (i = 0; i < namlen; ++i)
+    name2[i] = tolower (name[i]);
+  name2[i] = '\0';
+
+  char *result;
+  int len;
+  int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len);
+
+  if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
+    {
+      enum nss_status retval = yperr2nss (yperr);
+
+      if (retval == NSS_STATUS_TRYAGAIN)
+	{
+	  *herrnop = TRY_AGAIN;
+	  *errnop = errno;
+	}
+      if (retval == NSS_STATUS_NOTFOUND)
+	*herrnop = HOST_NOT_FOUND;
+      return retval;
+    }
+
+  struct parser_data data;
+  struct hostent host;
+  int parse_res = parse_line (result, &host, &data, buflen, errnop, AF_UNSPEC,
+			      0);
+  if (__builtin_expect (parse_res < 1, 0))
+    {
+      if (parse_res == -1)
+	{
+	  *herrnop = NETDB_INTERNAL;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  *herrnop = HOST_NOT_FOUND;
+	  return NSS_STATUS_NOTFOUND;
+	}
+    }
+
+  if (*pat == NULL)
+    {
+      uintptr_t pad = (-(uintptr_t) buffer
+		       % __alignof__ (struct gaih_addrtuple));
+      buffer += pad;
+      buflen = buflen > pad ? buflen - pad : 0;
+
+      if (__builtin_expect (buflen < sizeof (struct gaih_addrtuple), 0))
+	{
+	erange:
+	  free (result);
+	  *errnop = ERANGE;
+	  *herrnop = NETDB_INTERNAL;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+
+      *pat = (struct gaih_addrtuple *) buffer;
+      buffer += sizeof (struct gaih_addrtuple);
+      buflen -= sizeof (struct gaih_addrtuple);
+    }
+
+  (*pat)->next = NULL;
+  size_t h_name_len = strlen (host.h_name);
+  if (h_name_len >= buflen)
+    goto erange;
+  (*pat)->name = memcpy (buffer, host.h_name, h_name_len + 1);
+  (*pat)->family = host.h_addrtype;
+  memcpy ((*pat)->addr, host.h_addr_list[0], host.h_length);
+  (*pat)->scopeid = 0;
+  assert (host.h_addr_list[1] == NULL);
+
+  free (result);
+
+  return NSS_STATUS_SUCCESS;
 }
-#endif
diff --git a/nis/nss_nisplus/nisplus-hosts.c b/nis/nss_nisplus/nisplus-hosts.c
index f5f0ac96da..37d44773fc 100644
--- a/nis/nss_nisplus/nisplus-hosts.c
+++ b/nis/nss_nisplus/nisplus-hosts.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997-2002, 2003, 2005, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2003, 2005, 2006, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
 
@@ -17,6 +17,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <assert.h>
 #include <atomic.h>
 #include <ctype.h>
 #include <errno.h>
@@ -58,15 +59,15 @@ _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
   if (result == NULL)
     return 0;
 
-  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
-      __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ ||
-      strcmp(NIS_RES_OBJECT (result)[0].EN_data.en_type, "hosts_tbl") != 0 ||
-      NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4)
+  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
+      || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
+      || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, "hosts_tbl") != 0
+      || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4)
     return 0;
 
   char *data = first_unused;
 
-  if (room_left < (af == AF_INET6 || (flags & AI_V4MAPPED) != 0
+  if (room_left < (af != AF_INET || (flags & AI_V4MAPPED) != 0
 		   ? IN6ADDRSZ : INADDRSZ))
     {
     no_more_room:
@@ -75,8 +76,10 @@ _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
     }
 
   /* Parse address.  */
-  if (af == AF_INET && inet_pton (af, NISENTRYVAL (0, 2, result), data) > 0)
+  if (af != AF_INET6
+      && inet_pton (AF_INET, NISENTRYVAL (0, 2, result), data) > 0)
     {
+      assert ((flags & AI_V4MAPPED) == 0 || af != AF_UNSPEC);
       if (flags & AI_V4MAPPED)
 	{
 	  map_v4v6_address (data, data);
@@ -89,7 +92,7 @@ _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
 	  host->h_length = INADDRSZ;
 	}
     }
-  else if (af == AF_INET6
+  else if (af != AF_INET
 	   && inet_pton (AF_INET6, NISENTRYVAL (0, 2, result), data) > 0)
     {
       host->h_addrtype = AF_INET6;
@@ -109,27 +112,33 @@ _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
   first_unused = __stpncpy (first_unused, NISENTRYVAL (0, 0, result),
 			    NISENTRYLEN (0, 0, result));
   *first_unused++ = '\0';
-  room_left -= NISENTRYLEN (0, 0, result) + 1;
 
-  /* XXX Rewrite at some point to allocate the array first and then
-     copy the strings.  It wasteful to first concatenate the strings
-     to just split them again later.  */
+  room_left -= NISENTRYLEN (0, 0, result) + 1;
   char *line = first_unused;
-  for (i = 0; i < NIS_RES_NUMOBJ (result); ++i)
+
+  /* When this is a call to gethostbyname4_r we do not need the aliases.  */
+  if (af != AF_UNSPEC)
     {
-      if (strcmp (NISENTRYVAL (i, 1, result), host->h_name) != 0)
+      /* XXX Rewrite at some point to allocate the array first and then
+	 copy the strings.  It is wasteful to first concatenate the strings
+	 to just split them again later.  */
+      for (i = 0; i < NIS_RES_NUMOBJ (result); ++i)
 	{
-	  if (NISENTRYLEN (i, 1, result) + 2 > room_left)
-	    goto no_more_room;
-
-	  *first_unused++ = ' ';
-	  first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
-				    NISENTRYLEN (i, 1, result));
-	  *first_unused = '\0';
-	  room_left -= NISENTRYLEN (i, 1, result) + 1;
+	  if (strcmp (NISENTRYVAL (i, 1, result), host->h_name) != 0)
+	    {
+	      if (NISENTRYLEN (i, 1, result) + 2 > room_left)
+		goto no_more_room;
+
+	      *first_unused++ = ' ';
+	      first_unused = __stpncpy (first_unused,
+					NISENTRYVAL (i, 1, result),
+					NISENTRYLEN (i, 1, result));
+	      *first_unused = '\0';
+	      room_left -= NISENTRYLEN (i, 1, result) + 1;
+	    }
 	}
+      *first_unused++ = '\0';
     }
-  *first_unused++ = '\0';
 
   /* Adjust the pointer so it is aligned for
      storing pointers.  */
@@ -147,30 +156,34 @@ _nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host,
   host->h_addr_list[1] = NULL;
   host->h_aliases = &host->h_addr_list[2];
 
-  i = 0;
-  while (*line != '\0')
+  /* When this is a call to gethostbyname4_r we do not need the aliases.  */
+  if (af != AF_UNSPEC)
     {
-      /* Skip leading blanks.  */
-      while (isspace (*line))
-	++line;
+      i = 0;
+      while (*line != '\0')
+	{
+	  /* Skip leading blanks.  */
+	  while (isspace (*line))
+	    ++line;
 
-      if (*line == '\0')
-	break;
+	  if (*line == '\0')
+	    break;
 
-      if (room_left < sizeof (char *))
-	goto no_more_room;
+	  if (room_left < sizeof (char *))
+	    goto no_more_room;
 
-      room_left -= sizeof (char *);
-      host->h_aliases[i++] = line;
+	  room_left -= sizeof (char *);
+	  host->h_aliases[i++] = line;
 
-      while (*line != '\0' && *line != ' ')
-	++line;
+	  while (*line != '\0' && *line != ' ')
+	    ++line;
 
-      if (*line == ' ')
-	*line++ = '\0';
-    }
+	  if (*line == ' ')
+	    *line++ = '\0';
+	}
 
-  host->h_aliases[i] = NULL;
+      host->h_aliases[i] = NULL;
+    }
 
   return 1;
 }
@@ -204,6 +217,7 @@ _nss_create_tablename (int *errnop)
   return NSS_STATUS_SUCCESS;
 }
 
+
 enum nss_status
 _nss_nisplus_sethostent (int stayopen)
 {
@@ -226,6 +240,7 @@ _nss_nisplus_sethostent (int stayopen)
   return status;
 }
 
+
 enum nss_status
 _nss_nisplus_endhostent (void)
 {
@@ -242,6 +257,7 @@ _nss_nisplus_endhostent (void)
   return NSS_STATUS_SUCCESS;
 }
 
+
 static enum nss_status
 internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
 			       size_t buflen, int *errnop, int *herrnop)
@@ -329,6 +345,7 @@ internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
   return NSS_STATUS_SUCCESS;
 }
 
+
 enum nss_status
 _nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
 			   size_t buflen, int *errnop, int *herrnop)
@@ -345,26 +362,33 @@ _nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
   return status;
 }
 
+
+static enum nss_status
+get_tablename (int *herrnop)
+{
+  __libc_lock_lock (lock);
+
+  enum nss_status status = _nss_create_tablename (herrnop);
+
+  __libc_lock_unlock (lock);
+
+  if (status != NSS_STATUS_SUCCESS)
+    *herrnop = NETDB_INTERNAL;
+
+  return status;
+}
+
+
 static enum nss_status
 internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
 			   char *buffer, size_t buflen, int *errnop,
 			   int *herrnop, int flags)
 {
-  int parse_res, retval;
-
   if (tablename_val == NULL)
     {
-      __libc_lock_lock (lock);
-
-      enum nss_status status = _nss_create_tablename (errnop);
-
-      __libc_lock_unlock (lock);
-
+      enum nss_status status = get_tablename (herrnop);
       if (status != NSS_STATUS_SUCCESS)
-	{
-	  *herrnop = NETDB_INTERNAL;
-	  return NSS_STATUS_UNAVAIL;
-	}
+	return status;
     }
 
   if (name == NULL)
@@ -374,39 +398,36 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
       return NSS_STATUS_NOTFOUND;
     }
 
-  nis_result *result;
   char buf[strlen (name) + 10 + tablename_len];
   int olderr = errno;
 
   /* Search at first in the alias list, and use the correct name
      for the next search.  */
   snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
-  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
   if (result != NULL)
     {
-      char *bufptr = buf;
-
       /* If we did not find it, try it as original name. But if the
 	 database is correct, we should find it in the first case, too.  */
-      if ((result->status != NIS_SUCCESS
-	   && result->status != NIS_S_SUCCESS)
-	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	  || strcmp (result->objects.objects_val->EN_data.en_type,
-		     "hosts_tbl") != 0
-	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
-	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
-      else
+      char *bufptr = buf;
+      size_t buflen = sizeof (buf);
+
+      if ((result->status == NIS_SUCCESS || result->status == NIS_S_SUCCESS)
+	  && __type_of (result->objects.objects_val) == NIS_ENTRY_OBJ
+	  && strcmp (result->objects.objects_val->EN_data.en_type,
+		     "hosts_tbl") == 0
+	  && result->objects.objects_val->EN_data.en_cols.en_cols_len >= 3)
 	{
 	  /* We need to allocate a new buffer since there is no
-	     guarantee the returned name has a length limit.  */
-	  const char *entryval = NISENTRYVAL(0, 0, result);
-	  size_t buflen = strlen (entryval) + 10 + tablename_len;
+	     guarantee the returned alias name has a length limit.  */
+	  name = NISENTRYVAL(0, 0, result);
+	  size_t buflen = strlen (name) + 10 + tablename_len;
 	  bufptr = alloca (buflen);
-	  snprintf (bufptr, buflen, "[cname=%s],%s",
-		    entryval, tablename_val);
 	}
 
+      snprintf (bufptr, buflen, "[cname=%s],%s", name, tablename_val);
+
       nis_freeresult (result);
       result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
     }
@@ -417,7 +438,7 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
       return NSS_STATUS_TRYAGAIN;
     }
 
-  retval = niserr2nss (result->status);
+  int retval = niserr2nss (result->status);
   if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
     {
       if (retval == NSS_STATUS_TRYAGAIN)
@@ -431,8 +452,8 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
       return retval;
     }
 
-  parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer,
-					  buflen, errnop, flags);
+  int parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer,
+					      buflen, errnop, flags);
 
   nis_freeresult (result);
 
@@ -450,16 +471,24 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
   return NSS_STATUS_NOTFOUND;
 }
 
+
 enum nss_status
 _nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
 			       char *buffer, size_t buflen, int *errnop,
 			       int *herrnop)
 {
+  if (af != AF_INET && af != AF_INET6)
+    {
+      *herrnop = HOST_NOT_FOUND;
+      return NSS_STATUS_NOTFOUND;
+    }
+
   return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
 				    herrnop,
 			 ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
 }
 
+
 enum nss_status
 _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
 			      char *buffer, size_t buflen, int *errnop,
@@ -480,6 +509,7 @@ _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
 				   buflen, errnop, h_errnop, 0);
 }
 
+
 enum nss_status
 _nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
 			      struct hostent *host, char *buffer,
@@ -487,12 +517,7 @@ _nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
 {
   if (tablename_val == NULL)
     {
-      __libc_lock_lock (lock);
-
-      enum nss_status status = _nss_create_tablename (errnop);
-
-      __libc_lock_unlock (lock);
-
+      enum nss_status status = get_tablename (herrnop);
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -547,3 +572,44 @@ _nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
   __set_errno (olderr);
   return NSS_STATUS_NOTFOUND;
 }
+
+
+enum nss_status
+_nss_nisplus_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
+			       char *buffer, size_t buflen, int *errnop,
+			       int *herrnop, int32_t *ttlp)
+{
+  struct hostent host;
+
+  enum nss_status status = internal_gethostbyname2_r (name, AF_UNSPEC, &host,
+						      buffer, buflen,
+						      errnop, herrnop, 0);
+  if (__builtin_expect (status == NSS_STATUS_SUCCESS, 1))
+    {
+      if (*pat == NULL)
+	{
+	  uintptr_t pad = (-(uintptr_t) buffer
+			   % __alignof__ (struct gaih_addrtuple));
+	  buffer += pad;
+	  buflen = buflen > pad ? buflen - pad : 0;
+
+	  if (__builtin_expect (buflen < sizeof (struct gaih_addrtuple), 0))
+	    {
+	      free (result);
+	      *errnop = ERANGE;
+	      *herrnop = NETDB_INTERNAL;
+	      return NSS_STATUS_TRYAGAIN;
+	    }
+	}
+
+      (*pat)->next = NULL;
+      (*pat)->name = host.h_name;
+      (*pat)->family = host.h_addrtype;
+
+      memcpy ((*pat)->addr, host.h_addr_list[0], host.h_length);
+      (*pat)->scopeid = 0;
+      assert (host.h_addr_list[1] == NULL);
+    }
+
+  return status;
+}