/* Copyright (C) 1997-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#include <nss.h>

#include <errno.h>

#include <shadow.h>

#include <string.h>

#include <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;

/* Defined in nisplus-pwd.c.  */

extern nis_name pwd_tablename_val attribute_hidden;

extern size_t pwd_tablename_len attribute_hidden;

extern enum nss_status _nss_pwd_create_tablename (int *errnop);

enum nss_status

_nss_nisplus_setspent (int stayopen)

{

  enum nss_status status = NSS_STATUS_SUCCESS;

  int err;

  __libc_lock_lock (lock);

  if (result != NULL)

    {

      nis_freeresult (result);

      result = NULL;

    }

  if (pwd_tablename_val == NULL)

    status = _nss_pwd_create_tablename (&err;;

  __libc_lock_unlock (lock);

  return status;

}

enum nss_status

_nss_nisplus_endspent (void)

{

  __libc_lock_lock (lock);

  if (result != NULL)

    {

      nis_freeresult (result);

      result = NULL;

    }

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;

}

static enum nss_status

internal_nisplus_getspent_r (struct spwd *sp, char *buffer, size_t buflen,

			     int *errnop)

{

  int parse_res;

  /* Get the next entry until we found a correct one. */

  do

    {

      nis_result *saved_res;

      if (result == NULL)

	{

	  saved_res = NULL;

	  if (pwd_tablename_val == NULL)

	    {

	      enum nss_status status = _nss_pwd_create_tablename (errnop);

	      if (status != NSS_STATUS_SUCCESS)

		return status;

	    }

	  result = nis_first_entry (pwd_tablename_val);

	  if (result == NULL)

	    {

	      *errnop = errno;

	      return NSS_STATUS_TRYAGAIN;

	    }

	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)

	    return niserr2nss (result->status);

	}

      else

	{

	  saved_res = result;

	  result = nis_next_entry (pwd_tablename_val, &result->cookie);

	  if (result == NULL)

	    {

	      *errnop = errno;

	      return NSS_STATUS_TRYAGAIN;

	    }

	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)

	    {

	      nis_freeresult (saved_res);

	      return niserr2nss (result->status);

	    }

	}

      parse_res = _nss_nisplus_parse_spent (result, sp, buffer,

					    buflen, errnop);

      if (__glibc_unlikely (parse_res == -1))

	{

	  nis_freeresult (result);

	  result = saved_res;

	  *errnop = ERANGE;

	  return NSS_STATUS_TRYAGAIN;

	}

      if (saved_res != NULL)

	nis_freeresult (saved_res);

    }

  while (!parse_res);

  return NSS_STATUS_SUCCESS;

}

enum nss_status

_nss_nisplus_getspent_r (struct spwd *result, char *buffer, size_t buflen,

			 int *errnop)

{

  int status;

  __libc_lock_lock (lock);

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

  __libc_lock_unlock (lock);

  return status;

}

enum nss_status

_nss_nisplus_getspnam_r (const char *name, struct spwd *sp,

		     char *buffer, size_t buflen, int *errnop)

{

  int parse_res;

  if (pwd_tablename_val == NULL)

    {

      enum nss_status status = _nss_pwd_create_tablename (errnop);

      if (status != NSS_STATUS_SUCCESS)

	return status;

    }

  if (name == NULL)

    {

      *errnop = EINVAL;

      return NSS_STATUS_NOTFOUND;

    }

  nis_result *result;

  char buf[strlen (name) + 9 + pwd_tablename_len];

  int olderr = errno;

  snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val);

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

  if (result == NULL)

    {

      *errnop = ENOMEM;

      return NSS_STATUS_TRYAGAIN;

    }

  if (__glibc_unlikely (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_spent (result, sp, buffer, buflen, errnop);

  nis_freeresult (result);

  if (__glibc_unlikely (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;

}