diff options
Diffstat (limited to 'lib/libc/posix1e/acl_delete_entry.c')
| -rw-r--r-- | lib/libc/posix1e/acl_delete_entry.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/lib/libc/posix1e/acl_delete_entry.c b/lib/libc/posix1e/acl_delete_entry.c new file mode 100644 index 0000000..09b4507 --- /dev/null +++ b/lib/libc/posix1e/acl_delete_entry.c @@ -0,0 +1,162 @@ +/* + * Copyright (c) 2001-2002 Chris D. Faulhaber + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include "namespace.h" +#include <sys/acl.h> +#include "un-namespace.h" +#include <errno.h> +#include <string.h> +#include <stdio.h> + +#include "acl_support.h" + +static int +_entry_matches(const acl_entry_t a, const acl_entry_t b) +{ + /* + * There is a semantical difference here between NFSv4 and POSIX + * draft ACLs. In POSIX, there may be only one entry for the particular + * user or group. In NFSv4 ACL, there may be any number of them. We're + * trying to be more specific here in that case. + */ + switch (_entry_brand(a)) { + case ACL_BRAND_NFS4: + if (a->ae_tag != b->ae_tag || a->ae_entry_type != b->ae_entry_type) + return (0); + + /* If ae_ids matter, compare them as well. */ + if (a->ae_tag == ACL_USER || a->ae_tag == ACL_GROUP) { + if (a->ae_id != b->ae_id) + return (0); + } + + return (1); + + default: + if ((a->ae_tag == b->ae_tag) && (a->ae_id == b->ae_id)) + return (1); + } + + return (0); +} + +/* + * acl_delete_entry() (23.4.9): remove the ACL entry indicated by entry_d + * from acl. + */ +int +acl_delete_entry(acl_t acl, acl_entry_t entry_d) +{ + struct acl *acl_int; + struct acl_entry entry_int; + int i, j, found = 0; + + if (acl == NULL || entry_d == NULL) { + errno = EINVAL; + return (-1); + } + + acl_int = &acl->ats_acl; + + if (_entry_brand(entry_d) != _acl_brand(acl)) { + errno = EINVAL; + return (-1); + } + + if ((acl->ats_acl.acl_cnt < 1) || + (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { + errno = EINVAL; + return (-1); + } + + /* Use a local copy to prevent deletion of more than this entry */ + entry_int = *entry_d; + + for (i = 0; i < acl->ats_acl.acl_cnt;) { + if (_entry_matches(&(acl->ats_acl.acl_entry[i]), &entry_int)) { + /* ...shift the remaining entries... */ + for (j = i; j < acl->ats_acl.acl_cnt - 1; ++j) + acl->ats_acl.acl_entry[j] = + acl->ats_acl.acl_entry[j+1]; + /* ...drop the count and zero the unused entry... */ + acl->ats_acl.acl_cnt--; + bzero(&acl->ats_acl.acl_entry[j], + sizeof(struct acl_entry)); + acl->ats_cur_entry = 0; + + /* Continue with the loop to remove all maching entries. */ + found = 1; + } else + i++; + } + + if (found) + return (0); + + errno = EINVAL; + return (-1); +} + +int +acl_delete_entry_np(acl_t acl, int offset) +{ + struct acl *acl_int; + int i; + + if (acl == NULL) { + errno = EINVAL; + return (-1); + } + + acl_int = &acl->ats_acl; + + if (offset < 0 || offset >= acl_int->acl_cnt) { + errno = EINVAL; + return (-1); + } + + if ((acl->ats_acl.acl_cnt < 1) || + (acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) { + errno = EINVAL; + return (-1); + } + + /* ...shift the remaining entries... */ + for (i = offset; i < acl->ats_acl.acl_cnt - 1; ++i) + acl->ats_acl.acl_entry[i] = + acl->ats_acl.acl_entry[i+1]; + /* ...drop the count and zero the unused entry... */ + acl->ats_acl.acl_cnt--; + bzero(&acl->ats_acl.acl_entry[i], + sizeof(struct acl_entry)); + acl->ats_cur_entry = 0; + + return (0); +} |
