source: branches/samba-3.3.x/source/lib/secacl.c@ 206

/* 
 *  Unix SMB/Netbios implementation.
 *  SEC_ACL handling routines
 *  Copyright (C) Andrew Tridgell              1992-1998,
 *  Copyright (C) Jeremy R. Allison            1995-2003.
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
 *  Copyright (C) Paul Ashton                  1997-1998.
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  This program 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 General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"

/*******************************************************************
 Create a SEC_ACL structure.  
********************************************************************/

SEC_ACL *make_sec_acl(TALLOC_CTX *ctx, enum security_acl_revision revision,
                      int num_aces, SEC_ACE *ace_list)
{
        SEC_ACL *dst;
        int i;

        if((dst = TALLOC_ZERO_P(ctx,SEC_ACL)) == NULL)
                return NULL;

        dst->revision = revision;
        dst->num_aces = num_aces;
        dst->size = SEC_ACL_HEADER_SIZE;

        /* Now we need to return a non-NULL address for the ace list even
           if the number of aces required is zero.  This is because there
           is a distinct difference between a NULL ace and an ace with zero
           entries in it.  This is achieved by checking that num_aces is a
           positive number. */

        if ((num_aces) && 
            ((dst->aces = TALLOC_ARRAY(ctx, SEC_ACE, num_aces)) 
             == NULL)) {
                return NULL;
        }
        
        for (i = 0; i < num_aces; i++) {
                dst->aces[i] = ace_list[i]; /* Structure copy. */
                dst->size += ace_list[i].size;
        }

        return dst;
}

/*******************************************************************
 Duplicate a SEC_ACL structure.  
********************************************************************/

SEC_ACL *dup_sec_acl(TALLOC_CTX *ctx, SEC_ACL *src)
{
        if(src == NULL)
                return NULL;

        return make_sec_acl(ctx, src->revision, src->num_aces, src->aces);
}

/*******************************************************************
 Compares two SEC_ACL structures
********************************************************************/

bool sec_acl_equal(SEC_ACL *s1, SEC_ACL *s2)
{
        unsigned int i, j;

        /* Trivial cases */

        if (!s1 && !s2) return True;
        if (!s1 || !s2) return False;

        /* Check top level stuff */

        if (s1->revision != s2->revision) {
                DEBUG(10, ("sec_acl_equal(): revision differs (%d != %d)\n",
                           s1->revision, s2->revision));
                return False;
        }

        if (s1->num_aces != s2->num_aces) {
                DEBUG(10, ("sec_acl_equal(): num_aces differs (%d != %d)\n",
                           s1->revision, s2->revision));
                return False;
        }

        /* The ACEs could be in any order so check each ACE in s1 against 
           each ACE in s2. */

        for (i = 0; i < s1->num_aces; i++) {
                bool found = False;

                for (j = 0; j < s2->num_aces; j++) {
                        if (sec_ace_equal(&s1->aces[i], &s2->aces[j])) {
                                found = True;
                                break;
                        }
                }

                if (!found) return False;
        }

        return True;
}