/* 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;
}