/* Copyright (C) 1997, 2001, 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.

   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, 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 <bits/libc-lock.h>
#include <rpcsvc/nis.h>

#include "nss-nisplus.h"
#include "nisplus-parser.h"

__libc_lock_define_initialized (static, lock);

static nis_result *result;
static unsigned long next_entry;
static nis_name tablename_val;
static u_long tablename_len;

static enum nss_status
_nss_create_tablename (int *errnop)
{
  if (tablename_val == NULL)
    {
      char buf [40 + strlen (nis_local_directory ())];
      char *p;

      p = __stpcpy (buf, "group.org_dir.");
      p = __stpcpy (p, nis_local_directory ());
      tablename_val = __strdup (buf);
      if (tablename_val == NULL)
	{
	  *errnop = errno;
	  return NSS_STATUS_TRYAGAIN;
	}
      tablename_len = strlen (tablename_val);
    }
  return NSS_STATUS_SUCCESS;
}

static enum nss_status
internal_setgrent (void)
{
  enum nss_status status;
  int err;

  if (result)
    nis_freeresult (result);
  result = NULL;
  next_entry = 0;

  if (tablename_val == NULL)
    if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
      return NSS_STATUS_UNAVAIL;

  result = nis_list (tablename_val, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
  if (result == NULL)
    {
      status = NSS_STATUS_TRYAGAIN;
      __set_errno (ENOMEM);
    }
  else
    {
      status = niserr2nss (result->status);
      if (status != NSS_STATUS_SUCCESS)
	{
	  nis_freeresult (result);
	  result = NULL;
	}
    }
  return status;
}

enum nss_status
_nss_nisplus_setgrent (int stayopen)
{
  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_setgrent ();

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nisplus_endgrent (void)
{
  __libc_lock_lock (lock);

  if (result)
    nis_freeresult (result);
  result = NULL;

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}

static enum nss_status
internal_nisplus_getgrent_r (struct group *gr, char *buffer, size_t buflen,
			     int *errnop)
{
  int parse_res;

  if (result == NULL)
    {
      enum nss_status status;

      status = internal_setgrent ();
      if (result == NULL || status != NSS_STATUS_SUCCESS)
	return status;
    }

  /* Get the next entry until we found a correct one. */
  do
    {
      if (next_entry >= result->objects.objects_len)
	return NSS_STATUS_NOTFOUND;

      parse_res = _nss_nisplus_parse_grent (result, next_entry, gr,
					    buffer, buflen, errnop);
      if (parse_res == -1)
	return NSS_STATUS_TRYAGAIN;

      ++next_entry;
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_getgrent_r (struct group *result, char *buffer, size_t buflen,
			 int *errnop)
{
  int status;

  __libc_lock_lock (lock);

  status = internal_nisplus_getgrent_r (result, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nisplus_getgrnam_r (const char *name, struct group *gr,
			 char *buffer, size_t buflen, int *errnop)
{
  int parse_res;

  if (tablename_val == NULL)
    {
      enum nss_status status = _nss_create_tablename (errnop);

      if (status != NSS_STATUS_SUCCESS)
	return status;
    }

  if (name == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_NOTFOUND;
    }
  else
    {
      nis_result *result;
      char buf[strlen (name) + 24 + tablename_len];
      int olderr = errno;

      sprintf (buf, "[name=%s],%s", name, tablename_val);

      result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);

      if (result == NULL)
	{
	  *errnop = ENOMEM;
	  return NSS_STATUS_TRYAGAIN;
	}
      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
	{
	  enum nss_status status = niserr2nss (result->status);

	  nis_freeresult (result);
	  return status;
	}

      parse_res = _nss_nisplus_parse_grent (result, 0, gr, buffer, buflen,
					    errnop);
      nis_freeresult (result);
      if (parse_res < 1)
	{
	  if (parse_res == -1)
	    {
	      *errnop = ERANGE;
	      return NSS_STATUS_TRYAGAIN;
	    }
	  else
	    {
	      __set_errno (olderr);
	      return NSS_STATUS_NOTFOUND;
	    }
	}
      return NSS_STATUS_SUCCESS;
    }
}

enum nss_status
_nss_nisplus_getgrgid_r (const gid_t gid, struct group *gr,
			 char *buffer, size_t buflen, int *errnop)
{
  if (tablename_val == NULL)
    {
      enum nss_status status = _nss_create_tablename (errnop);

      if (status != NSS_STATUS_SUCCESS)
	return status;
    }

  {
    int parse_res;
    nis_result *result;
    char buf[36 + tablename_len];
    int olderr = errno;

    sprintf (buf, "[gid=%lu],%s", (unsigned long int) gid, tablename_val);

    result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);

    if (result == NULL)
      {
	*errnop = ENOMEM;
	return NSS_STATUS_TRYAGAIN;
      }
    if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
      {
	enum nss_status status = niserr2nss (result->status);

	__set_errno (olderr);

	nis_freeresult (result);
	return status;
      }

    parse_res = _nss_nisplus_parse_grent (result, 0, gr, buffer, buflen,
					  errnop);

    nis_freeresult (result);
    if (parse_res < 1)
      {
	__set_errno (olderr);

	if (parse_res == -1)
	  {
	    *errnop = ERANGE;
	    return NSS_STATUS_TRYAGAIN;
	  }
	else
	  return NSS_STATUS_NOTFOUND;
      }
    return NSS_STATUS_SUCCESS;
  }
}