Update.

2003-06-07  Thorsten Kukuk  <kukuk@suse.de>

	* nis/nss_compat/compat-grp.c: Remove unused nis_first variable
	(getgrent_next_file) Don't store group name to early in blacklist.

	* nis/nss_compat/compat-pwd.c (internal_getpwuid_r): Save strlen result
	and use memcpy instead of strcpy.

2003-06-28  Ulrich Drepper  <drepper@redhat.com>

	* nis/nss_compat/compat-grp.c: Optimize several little things.  Use
	stream unlocked.
	* nis/nss_compat/compat-initgroups.c: Likewise.
	* nis/nss_compat/compat-pwd.c: Likewise.
	* nis/nss_compat/compat-spwd.c: Likewise.

2003-06-27  Thorsten Kukuk  <kukuk@suse.de>

	* nis/nss_compat/compat-initgroups.c: Don't use our own NIS/NIS+
	functions, dlopen corresponding NSS module instead.

1 files changed, 224 insertions, 451 deletions

diff --git a/nis/nss_compat/compat-initgroups.c b/nis/nss_compat/compat-initgroups.c
index ed198325d8..d30d4700c0 100644
--- a/nis/nss_compat/compat-initgroups.c
+++ b/nis/nss_compat/compat-initgroups.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
 
@@ -17,29 +17,39 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#if 0 /* XXX this one needs to be rewritten.  */
-
+#include <alloca.h>
+#include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <nss.h>
 #include <grp.h>
-#include <ctype.h>
+#include <nss.h>
+#include <stdio_ext.h>
 #include <string.h>
 #include <unistd.h>
-#include <rpcsvc/yp.h>
-#include <rpcsvc/ypclnt.h>
-#include <rpcsvc/nis.h>
+#include <rpc/types.h>
 #include <sys/param.h>
 #include <nsswitch.h>
-
-#include "nss-nis.h"
-#include "nss-nisplus.h"
-#include "nisplus-parser.h"
+#include <bits/libc-lock.h>
 
 static service_user *ni;
-static bool_t use_nisplus; /* default: group_compat: nis */
-static nis_name grptable; /* Name of the group table */
-static size_t grptablelen;
+/* Type of the lookup function.  */
+static enum nss_status (*nss_initgroups_dyn) (const char *, gid_t,
+					      long int *, long int *,
+					      gid_t **, long int, int *);
+static enum nss_status (*nss_setgrent) (int stayopen);
+static enum nss_status (*nss_getgrnam_r) (const char *name,
+					  struct group * grp, char *buffer,
+					  size_t buflen, int *errnop);
+static enum nss_status (*nss_getgrgid_r) (gid_t gid, struct group * grp,
+					  char *buffer, size_t buflen,
+					  int *errnop);
+static enum nss_status (*nss_getgrent_r) (struct group * grp, char *buffer,
+					  size_t buflen, int *errnop);
+static enum nss_status (*nss_endgrent) (void);
+
+/* Protect global state against multiple changers.  */
+__libc_lock_define_initialized (static, lock)
+
 
 /* Get the declaration of the parser function.  */
 #define ENTNAME grent
@@ -51,29 +61,17 @@ static size_t grptablelen;
 #define BLACKLIST_INITIAL_SIZE 512
 #define BLACKLIST_INCREMENT 256
 struct blacklist_t
-  {
-    char *data;
-    int current;
-    int size;
-  };
-
-struct response_t
 {
-  char *val;
-  struct response_t *next;
+  char *data;
+  int current;
+  int size;
 };
 
 struct ent_t
-  {
-    bool_t nis;
-    bool_t nis_first;
-    char *oldkey;
-    int oldkeylen;
-    nis_result *result;
-    FILE *stream;
-    struct blacklist_t blacklist;
-    struct response_t *start;
-    struct response_t *next;
+{
+  bool_t files;
+  FILE *stream;
+  struct blacklist_t blacklist;
 };
 typedef struct ent_t ent_t;
 
@@ -82,68 +80,26 @@ typedef struct ent_t ent_t;
 static void blacklist_store_name (const char *, ent_t *);
 static int in_blacklist (const char *, int, ent_t *);
 
-static int
-saveit (int instatus, char *inkey, int inkeylen, char *inval,
-        int invallen, char *indata)
-{
-  ent_t *intern = (ent_t *) indata;
-
-  if (instatus != YP_TRUE)
-    return instatus;
-
-  if (inkey && inkeylen > 0 && inval && invallen > 0)
-    {
-      if (intern->start == NULL)
-        {
-          intern->start = malloc (sizeof (struct response_t));
-	  if (intern->start == NULL)
-	    return YP_FALSE;
-          intern->next = intern->start;
-        }
-      else
-        {
-          intern->next->next = malloc (sizeof (struct response_t));
-	  if (intern->next->next == NULL)
-	    return YP_FALSE;
-          intern->next = intern->next->next;
-        }
-      intern->next->next = NULL;
-      intern->next->val = malloc (invallen + 1);
-      if (intern->next->val == NULL)
-	return YP_FALSE;
-      strncpy (intern->next->val, inval, invallen);
-      intern->next->val[invallen] = '\0';
-    }
-
-  return 0;
-}
-
-static enum nss_status
-_nss_first_init (void)
+/* Initialize the NSS interface/functions. The calling function must
+   hold the lock.  */
+static void
+init_nss_interface (void)
 {
-  if (ni == NULL)
-    {
-      __nss_database_lookup ("group_compat", NULL, "nis", &ni);
-      use_nisplus = (strcmp (ni->name, "nisplus") == 0);
-    }
+  __libc_lock_lock (lock);
 
-  if (grptable == NULL)
+  /* Retest.  */
+  if (ni == NULL
+      && __nss_database_lookup ("group_compat", NULL, "nis", &ni) >= 0)
     {
-      static const char key[] = "group.org_dir.";
-      const char *local_dir = nis_local_directory ();
-      size_t len_local_dir = strlen (local_dir);
-
-      grptable = malloc (sizeof (key) + len_local_dir);
-      if (grptable == NULL)
-        return NSS_STATUS_TRYAGAIN;
-
-      grptablelen = ((char *) mempcpy (mempcpy (grptable,
-						key, sizeof (key) - 1),
-				       local_dir, len_local_dir + 1)
-		     - grptable) - 1;
+      nss_initgroups_dyn = __nss_lookup_function (ni, "initgroups_dyn");
+      nss_setgrent = __nss_lookup_function (ni, "setgrent");
+      nss_getgrnam_r = __nss_lookup_function (ni, "getgrnam_r");
+      nss_getgrgid_r = __nss_lookup_function (ni, "getgrgid_r");
+      nss_getgrent_r = __nss_lookup_function (ni, "getgrent_r");
+      nss_endgrent = __nss_lookup_function (ni, "endgrent");
     }
 
-  return NSS_STATUS_SUCCESS;
+  __libc_lock_unlock (lock);
 }
 
 static enum nss_status
@@ -151,26 +107,10 @@ internal_setgrent (ent_t *ent)
 {
   enum nss_status status = NSS_STATUS_SUCCESS;
 
-  ent->nis = ent->nis_first = 0;
-
-  ent->start = NULL;
-  ent->next = NULL;
-
-  if (_nss_first_init () != NSS_STATUS_SUCCESS)
-    return NSS_STATUS_UNAVAIL;
-
-  if (ent->oldkey != NULL)
-    {
-      free (ent->oldkey);
-      ent->oldkey = NULL;
-      ent->oldkeylen = 0;
-    }
+  ent->files = TRUE;
 
-  if (ent->result != NULL)
-    {
-      nis_freeresult (ent->result);
-      ent->result = NULL;
-    }
+  if (ni == NULL)
+    init_nss_interface ();
 
   if (ent->blacklist.data != NULL)
     {
@@ -181,35 +121,33 @@ internal_setgrent (ent_t *ent)
   else
     ent->blacklist.current = 0;
 
+  ent->stream = fopen ("/etc/group", "rm");
+
   if (ent->stream == NULL)
+    status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+  else
     {
-      ent->stream = fopen ("/etc/group", "r");
+      /* We have to make sure the file is  `closed on exec'.  */
+      int result, flags;
 
-      if (ent->stream == NULL)
-	status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
-      else
+      result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD, 0);
+      if (result >= 0)
 	{
-	  /* We have to make sure the file is  `closed on exec'.  */
-	  int result, flags;
-
-	  result = flags = fcntl (fileno (ent->stream), F_GETFD, 0);
-	  if (result >= 0)
-	    {
-	      flags |= FD_CLOEXEC;
-	      result = fcntl (fileno (ent->stream), F_SETFD, flags);
-	    }
-	  if (result < 0)
-	    {
-	      /* Something went wrong.  Close the stream and return a
-		 failure.  */
-	      fclose (ent->stream);
-	      ent->stream = NULL;
-	      status = NSS_STATUS_UNAVAIL;
-	    }
+	  flags |= FD_CLOEXEC;
+	  result = fcntl (fileno_unlocked (ent->stream), F_SETFD, flags);
+	}
+      if (result < 0)
+	{
+	  /* Something went wrong.  Close the stream and return a
+	     failure.  */
+	  fclose (ent->stream);
+	  ent->stream = NULL;
+	  status = NSS_STATUS_UNAVAIL;
 	}
+      else
+	/* We take care of locking ourself.  */
+	__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
     }
-  else
-    rewind (ent->stream);
 
   return status;
 }
@@ -224,21 +162,6 @@ internal_endgrent (ent_t *ent)
       ent->stream = NULL;
     }
 
-  ent->nis = ent->nis_first = 0;
-
-  if (ent->oldkey != NULL)
-    {
-      free (ent->oldkey);
-      ent->oldkey = NULL;
-      ent->oldkeylen = 0;
-    }
-
-  if (ent->result != NULL)
-    {
-      nis_freeresult (ent->result);
-      ent->result = NULL;
-    }
-
   if (ent->blacklist.data != NULL)
     {
       ent->blacklist.current = 1;
@@ -248,222 +171,145 @@ internal_endgrent (ent_t *ent)
   else
     ent->blacklist.current = 0;
 
-  while (ent->start != NULL)
-    {
-      if (ent->start->val != NULL)
-        free (ent->start->val);
-      ent->next = ent->start;
-      ent->start = ent->start->next;
-      free (ent->next);
-    }
-
-
   return NSS_STATUS_SUCCESS;
 }
 
-static enum nss_status
-getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
-		   size_t buflen, int *errnop)
+/* This function checks, if the user is a member of this group and if
+   yes, add the group id to the list.  */
+static void
+check_and_add_group (const char *user, gid_t group, long int *start,
+		     long int *size, gid_t **groupsp, long int limit,
+		     struct group *grp)
 {
-  struct parser_data *data = (void *) buffer;
-  char *domain, *p;
-  int parse_res;
-
-  if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
-    {
-      ent->nis = 0;
-      return NSS_STATUS_NOTFOUND;
-    }
-
-  if (ent->start == NULL)
-    {
-      struct ypall_callback ypcb;
-      enum nss_status status;
-
-      ypcb.foreach = saveit;
-      ypcb.data = (char *) ent;
-      status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
-      ent->next = ent->start;
-
-      if (ent->start == NULL || status != NSS_STATUS_SUCCESS)
-	{
-	  ent->nis = 0;
-	  return NSS_STATUS_UNAVAIL;
-	}
-    }
-
+  gid_t *groups = *groupsp;
+  char **member;
+
+  /* Don't add main group to list of groups.  */
+  if (grp->gr_gid == group)
+    return;
+
+  for (member = grp->gr_mem; *member != NULL; ++member)
+    if (strcmp (*member, user) == 0)
+      {
+	/* Matches user.  Insert this group.  */
+	if (*start == *size)
+	  {
+	    /* Need a bigger buffer.  */
+	    gid_t *newgroups;
+	    long int newsize;
+
+	    if (limit > 0 && *size == limit)
+	      /* We reached the maximum.  */
+	      return;
 
-  do
-    {
-      if (ent->next == NULL)
-        {
-	  ent->nis = 0;
-          return NSS_STATUS_NOTFOUND;
-        }
-
-      /* Copy the found data to our buffer...  */
-      p = strncpy (buffer, ent->next->val, buflen);
-      while (isspace (*p))
-        ++p;
-
-      parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
-      if (parse_res == -1)
-	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
+	    if (limit <= 0)
+	      newsize = 2 * *size;
+	    else
+	      newsize = MIN (limit, 2 * *size);
 
-      ent->next = ent->next->next;
+	    newgroups = realloc (groups, newsize * sizeof (*groups));
+	    if (newgroups == NULL)
+	      return;
+	    *groupsp = groups = newgroups;
+	    *size = newsize;
+	  }
 
-      if (parse_res &&
-	  in_blacklist (result->gr_name, strlen (result->gr_name), ent))
-	parse_res = 0; /* if result->gr_name in blacklist,search next entry */
-    }
-  while (!parse_res);
+	groups[*start] = grp->gr_gid;
+	*start += 1;
 
-  return NSS_STATUS_SUCCESS;
+	break;
+      }
 }
 
+/* get the next group from NSS  (+ entry). If the NSS module supports
+   initgroups_dyn, get all entries at once.  */
 static enum nss_status
-getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
-                       size_t buflen, int *errnop)
+getgrent_next_nss (ent_t *ent, char *buffer, size_t buflen, const char *user,
+		   gid_t group, long int *start, long int *size,
+		   gid_t **groupsp, long int limit, int *errnop)
 {
-  int parse_res;
+  enum nss_status status;
+  struct group grpbuf;
 
-  do
+  /* if this module does not support getgrent_r and initgroups_dyn,
+     abort. We cannot find the needed group entries.  */
+  if (nss_getgrent_r == NULL && nss_initgroups_dyn == NULL)
+    return NSS_STATUS_UNAVAIL;
+
+  /* Try nss_initgroups_dyn if supported. We also need getgrgid_r.
+     If this function is not supported, step through the whole group
+     database with getgrent_r.  */
+  if (nss_initgroups_dyn && nss_getgrgid_r)
     {
-      nis_result *save_oldres;
-      bool_t save_nis_first;
-
-      if (ent->nis_first)
-        {
-	  save_oldres = ent->result;
-	  save_nis_first = TRUE;
-          ent->result = nis_first_entry(grptable);
-          if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
-            {
-              ent->nis = 0;
-              return niserr2nss (ent->result->status);
-            }
-          ent->nis_first = FALSE;
-        }
-      else
-        {
-          nis_result *res;
-
-	  save_oldres = ent->result;
-	  save_nis_first = FALSE;
-          res = nis_next_entry(grptable, &ent->result->cookie);
-          ent->result = res;
-          if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
-            {
-	      ent->nis = 0;
-	      return niserr2nss (ent->result->status);
-            }
-        }
-      parse_res = _nss_nisplus_parse_grent (ent->result, 0, result,
-					    buffer, buflen, errnop);
-      if (parse_res == -1)
+      long int mystart = 0, mysize = limit;
+      gid_t *mygroupsp = __alloca (limit * sizeof (gid_t));
+
+      /* For every gid in the list we get from the NSS module,
+         get the whole group entry. We need to do this, since we
+         need the group name to check if it is in the blacklist.
+         In worst case, this is as twice as slow as stepping with
+         getgrent_r through the whole group database. But for large
+         group databases this is faster, since the user can only be
+         in a limited number of groups.  */
+      if (nss_initgroups_dyn (user, group, &mystart, &mysize, &mygroupsp,
+			      limit, errnop) == NSS_STATUS_SUCCESS)
 	{
-	  nis_freeresult (ent->result);
-	  ent->result = save_oldres;
-	  ent->nis_first = save_nis_first;
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      else
-	{
-	  if (!save_nis_first)
-	    nis_freeresult (save_oldres);
+	  /* A temporary buffer. We use the normal buffer, until we found
+	     an entry, for which this buffer is to small.  In this case, we
+	     overwrite the pointer with one to a bigger buffer.  */
+	  char *tmpbuf = buffer;
+	  size_t tmplen = buflen;
+	  int i;
+
+	  for (i = 0; i < mystart; i++)
+	    {
+	      while ((status = nss_getgrgid_r (mygroupsp[i], &grpbuf, tmpbuf,
+					       tmplen,
+					       errnop)) == NSS_STATUS_TRYAGAIN
+		     && *errnop == ERANGE)
+		if (tmpbuf == buffer)
+		  {
+		    tmplen *= 2;
+		    tmpbuf = __alloca (tmplen);
+		  }
+		else
+		  tmpbuf = extend_alloca (tmpbuf, tmplen, 2 * tmplen);
+
+	      if (!in_blacklist (grpbuf.gr_name,
+				 strlen (grpbuf.gr_name), ent))
+		check_and_add_group (user, group, start, size, groupsp,
+				     limit, &grpbuf);
+	    }
+	  return NSS_STATUS_NOTFOUND;
 	}
+    }
 
-      if (parse_res &&
-          in_blacklist (result->gr_name, strlen (result->gr_name), ent))
-        parse_res = 0; /* if result->gr_name in blacklist,search next entry */
+  /* If we come here, the NSS module does not support initgroups_dyn
+     and we have to step through the whole list ourself.  */
+  do
+    {
+      if ((status = nss_getgrent_r (&grpbuf, buffer, buflen, errnop)) !=
+	  NSS_STATUS_SUCCESS)
+	return status;
     }
-  while (!parse_res);
+  while (in_blacklist (grpbuf.gr_name, strlen (grpbuf.gr_name), ent));
 
+  check_and_add_group (user, group, start, size, groupsp, limit, &grpbuf);
   return NSS_STATUS_SUCCESS;
 }
 
-/* This function handle the +group entrys in /etc/group */
 static enum nss_status
-getgrnam_plusgroup (const char *name, struct group *result, char *buffer,
-		    size_t buflen, int *errnop)
+internal_getgrent_r (ent_t *ent, char *buffer, size_t buflen, const char *user,
+		     gid_t group, long int *start, long int *size,
+		     gid_t **groupsp, long int limit, int *errnop)
 {
   struct parser_data *data = (void *) buffer;
-  int parse_res;
-
-  if (use_nisplus) /* Do the NIS+ query here */
-    {
-      nis_result *res;
-      char buf[strlen (name) + 24 + grptablelen];
-
-      sprintf(buf, "[name=%s],%s", name, grptable);
-      res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
-      if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
-        {
-          enum nss_status status =  niserr2nss (res->status);
-
-          nis_freeresult (res);
-          return status;
-        }
-      parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer, buflen,
-					    errnop);
-      if (parse_res == -1)
-	{
-	  nis_freeresult (res);
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      nis_freeresult (res);
-    }
-  else /* Use NIS */
-    {
-      char *domain, *outval, *p;
-      int outvallen;
+  struct group grpbuf;
 
-      if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
-	return NSS_STATUS_NOTFOUND;
+  if (!ent->files)
+    return getgrent_next_nss (ent, buffer, buflen, user, group,
+			      start, size, groupsp, limit, errnop);
 
-      if (yp_match (domain, "group.byname", name, strlen (name),
-		    &outval, &outvallen) != YPERR_SUCCESS)
-	return NSS_STATUS_NOTFOUND;
-
-      if (buflen < ((size_t) outvallen + 1))
-	{
-	  free (outval);
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-
-      /* Copy the found data to our buffer...  */
-      p = strncpy (buffer, outval, buflen);
-
-      /* ... and free the data.  */
-      free (outval);
-      while (isspace (*p))
-        ++p;
-      parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
-      if (parse_res == -1)
-	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-    }
-
-  if (parse_res)
-    /* We found the entry.  */
-    return NSS_STATUS_SUCCESS;
-  else
-    return NSS_STATUS_RETURN;
-}
-
-static enum nss_status
-getgrent_next_file (struct group *result, ent_t *ent,
-		    char *buffer, size_t buflen, int *errnop)
-{
-  struct parser_data *data = (void *) buffer;
   while (1)
     {
       fpos_t pos;
@@ -474,8 +320,8 @@ getgrent_next_file (struct group *result, ent_t *ent,
 	{
 	  fgetpos (ent->stream, &pos);
 	  buffer[buflen - 1] = '\xff';
-	  p = fgets (buffer, buflen, ent->stream);
-	  if (p == NULL && feof (ent->stream))
+	  p = fgets_unlocked (buffer, buflen, ent->stream);
+	  if (p == NULL && feof_unlocked (ent->stream))
 	    return NSS_STATUS_NOTFOUND;
 
 	  if (p == NULL || buffer[buflen - 1] != '\xff')
@@ -492,10 +338,10 @@ getgrent_next_file (struct group *result, ent_t *ent,
 	  while (isspace (*p))
 	    ++p;
 	}
-      while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
-      /* Parse the line.  If it is invalid, loop to
-         get the next line of the file to parse.  */
-	     !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
+      while (*p == '\0' || *p == '#' ||	/* Ignore empty and comment lines. */
+	     /* Parse the line.  If it is invalid, loop to
+	        get the next line of the file to parse.  */
+	     !(parse_res = _nss_files_parse_grent (p, &grpbuf, data, buflen,
 						   errnop)));
 
       if (parse_res == -1)
@@ -506,90 +352,64 @@ getgrent_next_file (struct group *result, ent_t *ent,
 	  return NSS_STATUS_TRYAGAIN;
 	}
 
-      if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+      if (grpbuf.gr_name[0] != '+' && grpbuf.gr_name[0] != '-')
 	/* This is a real entry.  */
 	break;
 
       /* -group */
-      if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
-	  && result->gr_name[1] != '@')
+      if (grpbuf.gr_name[0] == '-' && grpbuf.gr_name[1] != '\0'
+	  && grpbuf.gr_name[1] != '@')
 	{
-	  blacklist_store_name (&result->gr_name[1], ent);
+	  blacklist_store_name (&grpbuf.gr_name[1], ent);
 	  continue;
 	}
 
       /* +group */
-      if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
-	  && result->gr_name[1] != '@')
+      if (grpbuf.gr_name[0] == '+' && grpbuf.gr_name[1] != '\0'
+	  && grpbuf.gr_name[1] != '@')
 	{
-          enum nss_status status;
-
- 	  /* Store the group in the blacklist for the "+" at the end of
+	  if (in_blacklist (&grpbuf.gr_name[1],
+			    strlen (&grpbuf.gr_name[1]), ent))
+	    continue;
+	  /* Store the group in the blacklist for the "+" at the end of
 	     /etc/group */
-	  blacklist_store_name (&result->gr_name[1], ent);
-	  status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
-				       buflen, errnop);
-          if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
-            break;
-          else
-            if (status == NSS_STATUS_RETURN /* We couldn't parse the entry */
-		|| status == NSS_STATUS_NOTFOUND) /* No group in NIS */
-              continue;
-            else
-	      {
-		if (status == NSS_STATUS_TRYAGAIN)
-		  {
-		    /* The parser ran out of space.  */
-		    fsetpos (ent->stream, &pos);
-		    *errnop = ERANGE;
-		  }
-		return status;
-	      }
+	  blacklist_store_name (&grpbuf.gr_name[1], ent);
+	  if (nss_getgrnam_r == NULL)
+	    return NSS_STATUS_UNAVAIL;
+	  else if (nss_getgrnam_r (&grpbuf.gr_name[1], &grpbuf, buffer,
+				   buflen, errnop) != NSS_STATUS_SUCCESS)
+	    continue;
+
+	  check_and_add_group (user, group, start, size, groupsp,
+			       limit, &grpbuf);
+
+	  return NSS_STATUS_SUCCESS;
 	}
 
       /* +:... */
-      if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
+      if (grpbuf.gr_name[0] == '+' && grpbuf.gr_name[1] == '\0')
 	{
-	  ent->nis = TRUE;
-	  ent->nis_first = TRUE;
-
-	  if (use_nisplus)
-	    return getgrent_next_nisplus (result, ent, buffer, buflen, errnop);
-	  else
-	    return getgrent_next_nis (result, ent, buffer, buflen, errnop);
+	  ent->files = FALSE;
+	  return getgrent_next_nss (ent, buffer, buflen, user, group,
+				    start, size, groupsp, limit, errnop);
 	}
     }
 
+  check_and_add_group (user, group, start, size, groupsp, limit, &grpbuf);
+
   return NSS_STATUS_SUCCESS;
 }
 
 
-static enum nss_status
-internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
-		     size_t buflen, int *errnop)
-{
-  if (ent->nis)
-    {
-      if (use_nisplus)
-	return getgrent_next_nisplus (gr, ent, buffer, buflen, errnop);
-      else
-	return getgrent_next_nis (gr, ent, buffer, buflen, errnop);
-    }
-  else
-    return getgrent_next_file (gr, ent, buffer, buflen, errnop);
-}
-
 enum nss_status
 _nss_compat_initgroups_dyn (const char *user, gid_t group, long int *start,
 			    long int *size, gid_t **groupsp, long int limit,
 			    int *errnop)
 {
-  struct group grpbuf, *g;
   size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
   char *tmpbuf;
   enum nss_status status;
-  ent_t intern = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
-  gid_t *groups = *groupsp;
+  ent_t intern = { TRUE, NULL, {NULL, 0, 0} };
 
   status = internal_setgrent (&intern);
   if (status != NSS_STATUS_SUCCESS)
@@ -599,59 +419,14 @@ _nss_compat_initgroups_dyn (const char *user, gid_t group, long int *start,
 
   do
     {
-      while ((status =
-              internal_getgrent_r (&grpbuf, &intern, tmpbuf, buflen,
-				   errnop)) == NSS_STATUS_TRYAGAIN
-             && *errnop == ERANGE)
-        {
-          buflen *= 2;
-          tmpbuf = __alloca (buflen);
-        }
-
-      if (status != NSS_STATUS_SUCCESS)
-        goto done;
-
-      g = &grpbuf;
-      if (g->gr_gid != group)
-        {
-          char **m;
-
-          for (m = g->gr_mem; *m != NULL; ++m)
-            if (strcmp (*m, user) == 0)
-              {
-                /* Matches user.  Insert this group.  */
-                if (*start == *size)
-                  {
-                    /* Need a bigger buffer.  */
-		    gid_t *newgroups;
-		    long int newsize;
-
-		    if (limit > 0 && *size == limit)
-		      /* We reached the maximum.  */
-		      goto done;
-
-		    if (limit <= 0)
-		      newsize = 2 * *size;
-		    else
-		      newsize = MIN (limit, 2 * *size);
-
-                    newgroups = realloc (groups, newsize * sizeof (*groups));
-                    if (newgroups == NULL)
-                      goto done;
-		    *groupsp = groups = newgroups;
-                    *size = newsize;
-                  }
-
-                groups[*start] = g->gr_gid;
-                *start += 1;
-
-                break;
-              }
-        }
+      while ((status = internal_getgrent_r (&intern, tmpbuf, buflen,
+					    user, group, start, size,
+					    groupsp, limit, errnop))
+	     == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
+	tmpbuf = extend_alloca (tmpbuf, buflen, 2 * buflen);
     }
   while (status == NSS_STATUS_SUCCESS);
 
-done:
   internal_endgrent (&intern);
 
   return NSS_STATUS_SUCCESS;
@@ -666,7 +441,7 @@ blacklist_store_name (const char *name, ent_t *ent)
   int namelen = strlen (name);
   char *tmp;
 
-  /* first call, setup cache */
+  /* First call, setup cache.  */
   if (ent->blacklist.size == 0)
     {
       ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
@@ -716,9 +491,7 @@ in_blacklist (const char *name, int namelen, ent_t *ent)
 
   buf[0] = '|';
   cp = stpcpy (&buf[1], name);
-  *cp++= '|';
+  *cp++ = '|';
   *cp = '\0';
   return strstr (ent->blacklist.data, buf) != NULL;
 }
-
-#endif