/* Copyright (c) 1997 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 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 <string.h>
#include <rpcsvc/nis.h>
#include <rpcsvc/nislib.h>

/* internal_nis_ismember ()
   return codes: -1 principal is in -group
                  0 principal isn't in any group
		  1 pirncipal is in group */
static int
internal_ismember (const_nis_name principal, const_nis_name group)
{
  if (group != NULL && strlen (group) > 0)
    {
      char buf[strlen (group) + 50];
      char leafbuf[strlen (group) + 2];
      char domainbuf[strlen (group) + 2];
      nis_result *res;
      char *cp, *cp2;
      u_int i;

      cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
      cp = stpcpy (cp, ".groups_dir");
      cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
      if (cp2 != NULL && strlen (cp2) > 0)
        {
	  *cp++ = '.';
          strcpy (cp, cp2);
	}
      res = nis_lookup (buf, EXPAND_NAME|FOLLOW_LINKS);
      if (res->status != NIS_SUCCESS && res->status != NIS_S_SUCCESS)
        return 0;

      if ((res->objects.objects_len != 1) ||
          (res->objects.objects_val[0].zo_data.zo_type != GROUP_OBJ))
        return 0;

      /* We search twice in the list, at first, if we have the name
	 with a "-", then if without. "-member" has priority */
      for (i = 0;
           i < res->objects.objects_val[0].GR_data.gr_members.gr_members_len;
           ++i)
	{
	  cp =res->objects.objects_val[0].GR_data.gr_members.gr_members_val[i];
	  if (cp[0] == '-')
	    {
	      if (strcmp (&cp[1], principal) == 0)
		return -1;
	      if (cp[1] == '@')
		switch (internal_ismember (principal, &cp[2]))
		  {
		  case -1:
		    return -1;
		  case 1:
		    return -1;
		  default:
		    break;
		  }
	      else
		if (cp[1] == '*')
		  {
		    char buf1[strlen (principal) + 2];
		    char buf2[strlen (cp) + 2];

		    strcpy (buf1, nis_domain_of (principal));
		    strcpy (buf2, nis_domain_of (cp));
		    if (strcmp (buf1, buf2) == 0)
		      return -1;
		  }
	    }
	}
      for (i = 0;
	   i < res->objects.objects_val[0].GR_data.gr_members.gr_members_len;
           ++i)
	{
	  cp =res->objects.objects_val[0].GR_data.gr_members.gr_members_val[i];
	  if (cp[0] != '-')
	    {
	      if (strcmp (cp, principal) == 0)
		return 1;
	      if (cp[0] == '@')
		switch (internal_ismember (principal, &cp[1]))
		  {
		  case -1:
		    return -1;
		  case 1:
		    return 1;
		  default:
		    break;
		  }
	      else
		if (cp[0] == '*')
		  {
		    char buf1[strlen (principal) + 2];
		    char buf2[strlen (cp) + 2];

		    if (strcmp (nis_domain_of_r (principal, buf1, sizeof buf1),
				nis_domain_of_r (cp, buf2, sizeof buf2)) == 0)
		      return 1;
		  }
	    }
	}
    }

  return 0;
}

bool_t
nis_ismember (const_nis_name principal, const_nis_name group)
{
  if (group != NULL && strlen (group) > 0)
    return internal_ismember (principal, group) == 1 ? TRUE : FALSE;
  else
    return FALSE;
}