/* Netgroup file parser in nss_db modules.

   Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   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 <ctype.h>

#include <dlfcn.h>

#include <errno.h>

#include <fcntl.h>

#include <netgroup.h>

#include <string.h>

#include <stdint.h>

#include <libc-lock.h>

#include <paths.h>

#include <stdlib.h>

#include "nsswitch.h"

#include "nss_db.h"

/* The hashing function we use.  */

#include "../intl/hash-string.h"

#define DBFILE		_PATH_VARDB "netgroup.db"

/* Maintenance of the shared handle open on the database.  */

enum nss_status

_nss_db_setnetgrent (const char *group, struct __netgrent *result)

{

  struct nss_db_map state;

  enum nss_status status = internal_setent (DBFILE, &state);

  if (status == NSS_STATUS_SUCCESS)

    {

      const struct nss_db_header *header = state.header;

      const stridx_t *hashtable

	= (const stridx_t *) ((const char *) header

			      + header->dbs[0].hashoffset);

      const char *valstrtab = (const char *) header + header->valstroffset;

      uint32_t hashval = __hash_string (group);

      size_t grouplen = strlen (group);

      size_t hidx = hashval % header->dbs[0].hashsize;

      size_t hval2 = 1 + hashval % (header->dbs[0].hashsize - 2);

      status = NSS_STATUS_NOTFOUND;

      while (hashtable[hidx] != ~((stridx_t) 0))

	{

	  const char *valstr = valstrtab + hashtable[hidx];

	  if (strncmp (valstr, group, grouplen) == 0

	      && isblank (valstr[grouplen]))

	    {

	      const char *cp = &valstr[grouplen + 1];

	      while (isblank (*cp))

		++cp;

	      if (*cp != '\0')

		{

		  result->data = strdup (cp);

		  if (result->data == NULL)

		    status = NSS_STATUS_TRYAGAIN;

		  else

		    {

		      status = NSS_STATUS_SUCCESS;

		      result->cursor = result->data;

		    }

		  break;

		}

	    }

	  if ((hidx += hval2) >= header->dbs[0].hashsize)

	    hidx -= header->dbs[0].hashsize;

	}

      internal_endent (&state);

    }

  return status;

}

enum nss_status

_nss_db_endnetgrent (struct __netgrent *result)

{

  free (result->data);

  result->data = NULL;

  result->data_size = 0;

  result->cursor = NULL;

  return NSS_STATUS_SUCCESS;

}

extern enum nss_status _nss_netgroup_parseline (char **cursor,

						struct __netgrent *result,

						char *buffer, size_t buflen,

						int *errnop);

enum nss_status

_nss_db_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,

		       int *errnop)

{

  enum nss_status status;

  status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,

				    errnop);

  return status;

}