Update.

1998-06-10  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/Makefile: Add nis-initgroups and compat-initgroups.
	* nis/libnss_compat.map: Add _nss_compat_initgroups.
	* nis/libnss_nis.map: Add _nss_nis_initgroups.
	* nis/nss_compat/compat-initgroups.c: New, faster then getgrent().
	* nis/nss_nis/nis-initgroups.c: Likewise.
	* libc-work/nss/nsswitch.c: Rename nss_lookup_function to
	__nss_lookup_function and make it public.
	* grp/initgroups.c: Rewrite, to use initgroups function from NSS
	module if exists, else use old method.

1998-06-19  Ulrich Drepper  <drepper@cygnus.com>

	* nss/getXXbyYY_r.c (lookup_function): Correct return in type
	definition.
	* nss/getXXent_r.c (set_function, end_function, get_function):
	Likewise.  Reported by Thorsten Kukuk.

	* sysdeps/unix/sysv/linux/sigstack.c: Mark sigstack as dangerous.

1998-06-19  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/unix/sysv/linux/sparc/Dist: Follow change from
	1998-06-16 and distribute kernel_termios.h.

	* nis/Makefile (distribute): Add nis_xdr.h.

1998-06-19  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/unix/sysv/linux/sigstack.c (sigstack): Disable for
	kernels that don't have sigaltstack.

5 files changed, 902 insertions, 10 deletions

diff --git a/nis/Makefile b/nis/Makefile
index f91121bc11..30d356dcb2 100644
--- a/nis/Makefile
+++ b/nis/Makefile
@@ -23,7 +23,7 @@ subdir	:= nis
 
 headers			:= $(wildcard rpcsvc/*.[hx])
 distribute		:= nss-nis.h nss-nisplus.h nis_intern.h Banner \
-			nisplus-parser.h nis_cache2.h
+			nisplus-parser.h nis_cache2.h nis_xdr.h
 
 # These are the databases available for the nis (and perhaps later nisplus)
 # service.  This must be a superset of the services in nss.
@@ -55,10 +55,11 @@ libnsl-routines = yp_xdr ypclnt ypupdate_xdr \
 		  nis_clone_res
 libnsl-map	= libnsl.map
 
-libnss_compat-routines	:= $(addprefix compat-,grp pwd spwd) nisplus-parser
+libnss_compat-routines	:= $(addprefix compat-,grp pwd spwd initgroups) \
+			   nisplus-parser
 libnss_compat-inhibit-o	= $(filter-out .os,$(object-suffixes))
 
-libnss_nis-routines	:= $(addprefix nis-,$(databases))
+libnss_nis-routines	:= $(addprefix nis-,$(databases)) nis-initgroups
 libnss_nis-inhibit-o	= $(filter-out .os,$(object-suffixes))
 
 libnss_nisplus-routines	:= $(addprefix nisplus-,$(databases)) nisplus-parser
diff --git a/nis/libnss_compat.map b/nis/libnss_compat.map
index cff0ef2c15..6178bb903a 100644
--- a/nis/libnss_compat.map
+++ b/nis/libnss_compat.map
@@ -3,8 +3,8 @@ GLIBC_2.0 {
     _nss_compat_endgrent; _nss_compat_endpwent; _nss_compat_endspent;
     _nss_compat_getgrent_r; _nss_compat_getgrgid_r; _nss_compat_getgrnam_r;
     _nss_compat_getpwent_r; _nss_compat_getpwnam_r; _nss_compat_getpwuid_r;
-    _nss_compat_getspent_r; _nss_compat_getspnam_r; _nss_compat_setgrent;
-    _nss_compat_setpwent; _nss_compat_setspent;
+    _nss_compat_getspent_r; _nss_compat_getspnam_r; _nss_compat_initgroups;
+    _nss_compat_setgrent; _nss_compat_setpwent; _nss_compat_setspent;
 
   local:
     *;
diff --git a/nis/libnss_nis.map b/nis/libnss_nis.map
index 2773fca29b..5d84fdcc6d 100644
--- a/nis/libnss_nis.map
+++ b/nis/libnss_nis.map
@@ -14,11 +14,11 @@ GLIBC_2.0 {
     _nss_nis_getpwnam_r; _nss_nis_getpwuid_r; _nss_nis_getrpcbyname_r;
     _nss_nis_getrpcbynumber_r; _nss_nis_getrpcent_r; _nss_nis_getsecretkey;
     _nss_nis_getservbyname_r; _nss_nis_getservbyport_r; _nss_nis_getservent_r;
-    _nss_nis_getspent_r; _nss_nis_getspnam_r; _nss_nis_netname2user;
-    _nss_nis_setaliasent; _nss_nis_setetherent; _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_getspent_r; _nss_nis_getspnam_r; _nss_nis_initgroups;
+    _nss_nis_netname2user; _nss_nis_setaliasent; _nss_nis_setetherent;
+    _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;
 
   local:
     *;
diff --git a/nis/nss_compat/compat-initgroups.c b/nis/nss_compat/compat-initgroups.c
new file mode 100644
index 0000000000..9def98ba52
--- /dev/null
+++ b/nis/nss_compat/compat-initgroups.c
@@ -0,0 +1,687 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <nss.h>
+#include <grp.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <rpcsvc/yp.h>
+#include <rpcsvc/ypclnt.h>
+#include <rpcsvc/nis.h>
+#include <nsswitch.h>
+
+#include "nss-nisplus.h"
+#include "nisplus-parser.h"
+
+static service_user *ni = NULL;
+static bool_t use_nisplus = FALSE; /* default: group_compat: nis */
+static nis_name grptable = NULL; /* Name of the group table */
+static size_t grptablelen = 0;
+
+/* Get the declaration of the parser function.  */
+#define ENTNAME grent
+#define STRUCTURE group
+#define EXTERN_PARSER
+#include <nss/nss_files/files-parse.c>
+
+/* Structure for remembering -group members ... */
+#define BLACKLIST_INITIAL_SIZE 512
+#define BLACKLIST_INCREMENT 256
+struct blacklist_t
+  {
+    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;
+};
+typedef struct ent_t ent_t;
+
+
+/* Prototypes for local functions.  */
+static void blacklist_store_name (const char *, ent_t *);
+static int in_blacklist (const char *, int, ent_t *);
+
+static enum nss_status
+_nss_first_init (void)
+{
+  if (ni == NULL)
+    {
+      __nss_database_lookup ("group_compat", NULL, "nis", &ni);
+      use_nisplus = (strcmp (ni->name, "nisplus") == 0);
+    }
+
+  if (grptable == NULL)
+    {
+      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;
+    }
+
+  return NSS_STATUS_SUCCESS;
+}
+
+static enum nss_status
+internal_setgrent (ent_t *ent)
+{
+  enum nss_status status = NSS_STATUS_SUCCESS;
+
+  ent->nis = ent->nis_first = 0;
+
+  if (_nss_first_init () != NSS_STATUS_SUCCESS)
+    return NSS_STATUS_UNAVAIL;
+
+  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;
+      ent->blacklist.data[0] = '|';
+      ent->blacklist.data[1] = '\0';
+    }
+  else
+    ent->blacklist.current = 0;
+
+  if (ent->stream == NULL)
+    {
+      ent->stream = fopen ("/etc/group", "r");
+
+      if (ent->stream == NULL)
+	status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+      else
+	{
+	  /* 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;
+	    }
+	}
+    }
+  else
+    rewind (ent->stream);
+
+  return status;
+}
+
+
+static enum nss_status
+internal_endgrent (ent_t *ent)
+{
+  if (ent->stream != NULL)
+    {
+      fclose (ent->stream);
+      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;
+      ent->blacklist.data[0] = '|';
+      ent->blacklist.data[1] = '\0';
+    }
+  else
+    ent->blacklist.current = 0;
+
+  return NSS_STATUS_SUCCESS;
+}
+
+static enum nss_status
+getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
+		   size_t buflen, int *errnop)
+{
+  struct parser_data *data = (void *) buffer;
+  char *domain;
+  char *outkey, *outval;
+  int outkeylen, outvallen, parse_res;
+  char *p;
+
+  if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
+    {
+      ent->nis = 0;
+      return NSS_STATUS_NOTFOUND;
+    }
+
+  do
+    {
+      char *save_oldkey;
+      int save_oldlen;
+      bool_t save_nis_first;
+
+      if (ent->nis_first)
+	{
+	  if (yp_first (domain, "group.byname", &outkey, &outkeylen,
+			&outval, &outvallen) != YPERR_SUCCESS)
+	    {
+	      ent->nis = 0;
+	      return NSS_STATUS_UNAVAIL;
+	    }
+
+	  if ( buflen < ((size_t) outvallen + 1))
+	    {
+	      free (outval);
+	      *errnop = ERANGE;
+	      return NSS_STATUS_TRYAGAIN;
+	    }
+
+	  save_oldkey = ent->oldkey;
+	  save_oldlen = ent->oldkeylen;
+	  save_nis_first = TRUE;
+	  ent->oldkey = outkey;
+	  ent->oldkeylen = outkeylen;
+	  ent->nis_first = FALSE;
+	}
+      else
+	{
+	  if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
+		       &outkey, &outkeylen, &outval, &outvallen)
+	      != YPERR_SUCCESS)
+	    {
+	      ent->nis = 0;
+	      return NSS_STATUS_NOTFOUND;
+	    }
+
+	  if ( buflen < ((size_t) outvallen + 1))
+	    {
+	      free (outval);
+	      *errnop = ERANGE;
+	      return NSS_STATUS_TRYAGAIN;
+	    }
+
+	  save_oldkey = ent->oldkey;
+	  save_oldlen = ent->oldkeylen;
+	  save_nis_first = FALSE;
+	  ent->oldkey = outkey;
+	  ent->oldkeylen = outkeylen;
+	}
+
+      /* 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)
+	{
+	  free (ent->oldkey);
+	  ent->oldkey = save_oldkey;
+	  ent->oldkeylen = save_oldlen;
+	  ent->nis_first = save_nis_first;
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  if (!save_nis_first)
+	    free (save_oldkey);
+	}
+
+      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);
+
+  return NSS_STATUS_SUCCESS;
+}
+
+static enum nss_status
+getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
+                       size_t buflen, int *errnop)
+{
+  int parse_res;
+
+  do
+    {
+      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)
+	{
+	  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);
+	}
+
+      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);
+
+  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)
+{
+  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;
+
+      if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
+	return NSS_STATUS_NOTFOUND;
+
+      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)
+	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;
+      int parse_res = 0;
+      char *p;
+
+      do
+	{
+	  fgetpos (ent->stream, &pos);
+	  buffer[buflen - 1] = '\xff';
+	  p = fgets (buffer, buflen, ent->stream);
+	  if (p == NULL && feof (ent->stream))
+	    return NSS_STATUS_NOTFOUND;
+	  if (p == NULL || buffer[buflen - 1] != '\xff')
+	    {
+	      fsetpos (ent->stream, &pos);
+	      *errnop = ERANGE;
+	      return NSS_STATUS_TRYAGAIN;
+	    }
+
+	  /* Terminate the line for any case.  */
+	  buffer[buflen - 1] = '\0';
+
+	  /* Skip leading blanks.  */
+	  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,
+						   errnop)));
+
+      if (parse_res == -1)
+	{
+	  /* The parser ran out of space.  */
+	  fsetpos (ent->stream, &pos);
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+
+      if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
+	/* This is a real entry.  */
+	break;
+
+      /* -group */
+      if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
+	  && result->gr_name[1] != '@')
+	{
+	  blacklist_store_name (&result->gr_name[1], ent);
+	  continue;
+	}
+
+      /* +group */
+      if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
+	  && result->gr_name[1] != '@')
+	{
+          enum nss_status status;
+
+ 	  /* 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;
+	      }
+	}
+
+      /* +:... */
+      if (result->gr_name[0] == '+' && result->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);
+	}
+    }
+
+  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 (const char *user, gid_t group, long int *start,
+			long int *size, gid_t *groups, 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}};
+
+  status = internal_setgrent (&intern);
+  if (status != NSS_STATUS_SUCCESS)
+    return status;
+
+  tmpbuf = __alloca (buflen);
+
+  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 && limit <= 0)
+                  {
+                    /* Need a bigger buffer.  */
+                    groups = realloc (groups, *size * sizeof (*groups));
+                    if (groups == NULL)
+                      goto done;
+                    *size *= 2;
+                  }
+
+                groups[*start] = g->gr_gid;
+                *start += 1;
+
+                if (*start == limit)
+                  /* Can't take any more groups; stop searching.  */
+                  goto done;
+
+                break;
+              }
+        }
+    }
+  while (status == NSS_STATUS_SUCCESS);
+
+done:
+  internal_endgrent (&intern);
+
+  return NSS_STATUS_SUCCESS;
+}
+
+
+/* Support routines for remembering -@netgroup and -user entries.
+   The names are stored in a single string with `|' as separator. */
+static void
+blacklist_store_name (const char *name, ent_t *ent)
+{
+  int namelen = strlen (name);
+  char *tmp;
+
+  /* first call, setup cache */
+  if (ent->blacklist.size == 0)
+    {
+      ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
+      ent->blacklist.data = malloc (ent->blacklist.size);
+      if (ent->blacklist.data == NULL)
+	return;
+      ent->blacklist.data[0] = '|';
+      ent->blacklist.data[1] = '\0';
+      ent->blacklist.current = 1;
+    }
+  else
+    {
+      if (in_blacklist (name, namelen, ent))
+	return;			/* no duplicates */
+
+      if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
+	{
+	  ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
+	  tmp = realloc (ent->blacklist.data, ent->blacklist.size);
+	  if (tmp == NULL)
+	    {
+	      free (ent->blacklist.data);
+	      ent->blacklist.size = 0;
+	      return;
+	    }
+	  ent->blacklist.data = tmp;
+	}
+    }
+
+  tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
+  *tmp++ = '|';
+  *tmp = '\0';
+  ent->blacklist.current += namelen + 1;
+
+  return;
+}
+
+/* returns TRUE if ent->blacklist contains name, else FALSE */
+static bool_t
+in_blacklist (const char *name, int namelen, ent_t *ent)
+{
+  char buf[namelen + 3];
+  char *cp;
+
+  if (ent->blacklist.data == NULL)
+    return FALSE;
+
+  buf[0] = '|';
+  cp = stpcpy (&buf[1], name);
+  *cp++= '|';
+  *cp = '\0';
+  return strstr (ent->blacklist.data, buf) != NULL;
+}
diff --git a/nis/nss_nis/nis-initgroups.c b/nis/nss_nis/nis-initgroups.c
new file mode 100644
index 0000000000..5960c80502
--- /dev/null
+++ b/nis/nss_nis/nis-initgroups.c
@@ -0,0 +1,204 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <nss.h>
+#include <grp.h>
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <rpcsvc/yp.h>
+#include <rpcsvc/ypclnt.h>
+
+#include "nss-nis.h"
+
+/* Get the declaration of the parser function.  */
+#define ENTNAME grent
+#define STRUCTURE group
+#define EXTERN_PARSER
+#include <nss/nss_files/files-parse.c>
+
+struct response_t
+{
+  char *val;
+  struct response_t *next;
+};
+
+struct intern_t
+{
+  struct response_t *start;
+  struct response_t *next;
+};
+typedef struct intern_t intern_t;
+
+static int
+saveit (int instatus, char *inkey, int inkeylen, char *inval,
+        int invallen, char *indata)
+{
+  intern_t *intern = (intern_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));
+          intern->next = intern->start;
+        }
+      else
+        {
+          intern->next->next = malloc (sizeof (struct response_t));
+          intern->next = intern->next->next;
+        }
+      intern->next->next = NULL;
+      intern->next->val = malloc (invallen + 1);
+      strncpy (intern->next->val, inval, invallen);
+      intern->next->val[invallen] = '\0';
+    }
+
+  return 0;
+}
+
+static enum nss_status
+internal_setgrent (intern_t *intern)
+{
+  char *domainname;
+  struct ypall_callback ypcb;
+  enum nss_status status;
+
+  if (yp_get_default_domain (&domainname))
+    return NSS_STATUS_UNAVAIL;
+
+  intern->start = NULL;
+
+  ypcb.foreach = saveit;
+  ypcb.data = (char *) intern;
+  status = yperr2nss (yp_all (domainname, "group.byname", &ypcb));
+  intern->next = intern->start;
+
+  return status;
+}
+
+static enum nss_status
+internal_getgrent_r (struct group *grp, char *buffer, size_t buflen,
+		     int *errnop, intern_t *intern)
+{
+  struct parser_data *data = (void *) buffer;
+  int parse_res;
+  char *p;
+
+  if (intern->start == NULL)
+    internal_setgrent (intern);
+
+  /* Get the next entry until we found a correct one. */
+  do
+    {
+      if (intern->next == NULL)
+        return NSS_STATUS_NOTFOUND;
+      p = strncpy (buffer, intern->next->val, buflen);
+      while (isspace (*p))
+        ++p;
+
+      parse_res = _nss_files_parse_grent (p, grp, data, buflen, errnop);
+      if (parse_res == -1)
+        return NSS_STATUS_TRYAGAIN;
+      intern->next = intern->next->next;
+    }
+  while (!parse_res);
+
+  return NSS_STATUS_SUCCESS;
+}
+
+enum nss_status
+_nss_nis_initgroups (const char *user, gid_t group, long int *start,
+		     long int *size, gid_t *groups, long int limit,
+		     int *errnop)
+{
+  struct group grpbuf, *g;
+  size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
+  char *tmpbuf;
+  enum nss_status status;
+  intern_t intern = { NULL, NULL };
+
+  status = internal_setgrent (&intern);
+  if (status != NSS_STATUS_SUCCESS)
+    return status;
+
+  tmpbuf = __alloca (buflen);
+
+  do
+    {
+      while ((status =
+	      internal_getgrent_r (&grpbuf, tmpbuf, buflen, errnop,
+				   &intern)) == 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 && limit <= 0)
+                  {
+                    /* Need a bigger buffer.  */
+		    groups = realloc (groups, *size * sizeof (*groups));
+		    if (groups == NULL)
+		      goto done;
+                    *size *= 2;
+                  }
+
+                groups[*start] = g->gr_gid;
+		*start += 1;
+
+                if (*start == limit)
+                  /* Can't take any more groups; stop searching.  */
+                  goto done;
+
+                break;
+              }
+        }
+    }
+  while (status == NSS_STATUS_SUCCESS);
+
+done:
+  while (intern.start != NULL)
+    {
+      if (intern.start->val != NULL)
+        free (intern.start->val);
+      intern.next = intern.start;
+      intern.start = intern.start->next;
+      free (intern.next);
+    }
+
+  return NSS_STATUS_SUCCESS;
+}