1  /*
       2    Copyright (C) 2000, 2002, 2003  Andreas Gruenbacher <agruen@suse.de>
       3  
       4    This program is free software: you can redistribute it and/or modify it
       5    under the terms of the GNU Lesser General Public License as published by
       6    the Free Software Foundation, either version 2.1 of the License, or
       7    (at your option) any later version.
       8  
       9    This program is distributed in the hope that it will be useful,
      10    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12    GNU Lesser General Public License for more details.
      13  
      14    You should have received a copy of the GNU Lesser General Public License
      15    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      16  */
      17  
      18  #include "config.h"
      19  #include <errno.h>
      20  #include <sys/acl.h>
      21  #include <acl/libacl.h>
      22  #include <errno.h>
      23  #include "libobj.h"
      24  
      25  #ifndef ENOATTR
      26  # define ENOATTR ENODATA
      27  #endif
      28  
      29  typedef unsigned int permset_t;
      30  
      31  #define ACL_PERM_NONE		(0x0000)
      32  
      33  /* object types */
      34  struct acl_permset_obj_tag;
      35  typedef struct acl_permset_obj_tag acl_permset_obj;
      36  struct qualifier_obj_tag;
      37  typedef struct qualifier_obj_tag qualifier_obj;
      38  struct acl_entry_obj_tag;
      39  typedef struct acl_entry_obj_tag acl_entry_obj;
      40  struct acl_obj_tag;
      41  typedef struct acl_obj_tag acl_obj;
      42  
      43  /* permset_t object */
      44  struct __acl_permset_ext {
      45  	permset_t		s_perm;
      46  };
      47  struct acl_permset_obj_tag {
      48  	obj_prefix		o_prefix;
      49  	struct __acl_permset_ext i;
      50  };
      51  
      52  #define sperm i.s_perm
      53  #define oprefix i.o_prefix
      54  
      55  #define permset_obj_equal(s1, s2) \
      56  	((s1).sperm == (s2).sperm)
      57  
      58  /* qualifier object */
      59  struct __qualifier_ext {
      60          id_t                    q_id;
      61  };
      62  
      63  struct qualifier_obj_tag {
      64  	obj_prefix		o_prefix;
      65  	struct __qualifier_ext	i;
      66  };
      67  
      68  #define qid i.q_id
      69  
      70  #define qualifier_obj_id(q) \
      71  	((q).qid)
      72  
      73  /* acl_entry object */
      74  struct __acl_entry {
      75  	acl_tag_t		e_tag;
      76  	qualifier_obj		e_id;
      77  	acl_permset_obj		e_perm;
      78  };
      79  
      80  struct __acl_entry_ext {
      81  	acl_entry_obj		*e_prev, *e_next;
      82  	acl_obj			*e_container;
      83  	struct __acl_entry	e_entry;
      84  };
      85  
      86  struct acl_entry_obj_tag {
      87  	obj_prefix              o_prefix;
      88  	struct __acl_entry_ext	i;
      89  };
      90  	
      91  #define econtainer i.e_container
      92  #define eprev i.e_prev
      93  #define enext i.e_next
      94  #define eentry i.e_entry
      95  #define etag i.e_entry.e_tag
      96  #define eperm i.e_entry.e_perm
      97  #define eid   i.e_entry.e_id
      98  
      99  #define init_acl_entry_obj(entry) do { \
     100  	(entry).etag = ACL_UNDEFINED_TAG; \
     101  	new_obj_p_here(acl_permset, &(entry).eperm); \
     102  	(entry).eperm.sperm = ACL_PERM_NONE; \
     103  	new_obj_p_here(qualifier, &(entry).eid); \
     104  	(entry).eid.qid = ACL_UNDEFINED_ID; \
     105  	} while(0)
     106  
     107  /* acl object */
     108  struct __acl_ext {
     109  	acl_entry_obj		*a_prev, *a_next;
     110  	acl_entry_obj		*a_curr;
     111  	acl_entry_obj		*a_prealloc, *a_prealloc_end;
     112  	size_t			a_used;
     113  };
     114  struct acl_obj_tag {
     115  	obj_prefix              o_prefix;
     116  	struct __acl_ext	i;
     117  };
     118  
     119  #define aprev		i.a_prev
     120  #define anext		i.a_next
     121  #define acurr		i.a_curr
     122  #define aused		i.a_used
     123  #define aprealloc	i.a_prealloc
     124  #define aprealloc_end	i.a_prealloc_end
     125  
     126  /* external ACL representation */
     127  struct __acl {
     128  	size_t			x_size;
     129  	struct __acl_entry	x_entries[0];
     130  };
     131  
     132  extern int __acl_reorder_entry_obj_p(acl_entry_obj *acl_entry_obj_p) hidden;
     133  extern int __acl_reorder_obj_p(acl_obj *acl_obj_p) hidden;
     134  
     135  extern acl_obj *__acl_init_obj(int count) hidden;
     136  extern acl_entry_obj *__acl_create_entry_obj(acl_obj *acl_obj_p) hidden;
     137  extern void __acl_free_acl_obj(acl_obj *acl_obj_p) hidden;
     138  
     139  extern char *__acl_to_any_text(acl_t acl, ssize_t *len_p,
     140  			       const char *prefix, char separator,
     141  			       const char *suffix, int options) hidden;
     142  extern int __apply_mask_to_mode(mode_t *mode, acl_t acl) hidden;
     143  
     144  #define FOREACH_ACL_ENTRY(entry_obj_p, acl_obj_p) \
     145  	for( (entry_obj_p) = (acl_obj_p)->anext; \
     146  	     (entry_obj_p) != (acl_entry_obj *)(acl_obj_p); \
     147  	     (entry_obj_p) = (entry_obj_p)->enext )