merge.c revision 74465
1/* 2 * Copyright (c) 2001 Chris D. Faulhaber 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE 18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: head/bin/setfacl/merge.c 74465 2001-03-19 18:09:25Z rwatson $ 27 */ 28 29#include <sys/types.h> 30#include <sys/acl.h> 31#include <sys/stat.h> 32 33#include <err.h> 34#include <stdio.h> 35#include <sysexits.h> 36 37#include "setfacl.h" 38 39/* merge acl into existing file's ACL */ 40int 41merge_acl(acl_t acl, acl_t *prev_acl) 42{ 43 acl_t acl_new; 44 int blank_acl_user, blank_acl_group, have_entry, i, j; 45 struct stat sb; 46 47 blank_acl_user = blank_acl_group = 0; 48 49 if (acl_type == ACL_TYPE_ACCESS) 50 acl_new = acl_dup(prev_acl[0]); 51 else 52 acl_new = acl_dup(prev_acl[1]); 53 if (!acl_new) 54 err(EX_OSERR, "acl_dup() failed"); 55 56 /* step through new ACL entries */ 57 for (i = 0; i < acl->acl_cnt; i++) { 58 have_entry = 0; 59 60 /* oh look, we have an ACL_MASK entry */ 61 if (acl->acl_entry[i].ae_tag == ACL_MASK) 62 have_mask = 1; 63 64 /* check against the existing ACL entries */ 65 for (j = 0; j < acl_new->acl_cnt && !have_entry; j++) { 66 if (acl_new->acl_entry[j].ae_tag == 67 acl->acl_entry[i].ae_tag) { 68 switch(acl->acl_entry[i].ae_tag) { 69 case ACL_USER_OBJ: 70 acl_new->acl_entry[j].ae_perm = 71 acl->acl_entry[i].ae_perm; 72 acl_new->acl_entry[j].ae_id = sb.st_uid; 73 have_entry = 1; 74 break; 75 case ACL_GROUP_OBJ: 76 acl_new->acl_entry[j].ae_perm = 77 acl->acl_entry[i].ae_perm; 78 acl_new->acl_entry[j].ae_id = sb.st_gid; 79 have_entry = 1; 80 break; 81 default: 82 if (acl_new->acl_entry[j].ae_id == 83 acl->acl_entry[i].ae_id) { 84 /* any other matches */ 85 acl_new->acl_entry[j].ae_perm = 86 acl->acl_entry[i].ae_perm; 87 have_entry = 1; 88 } 89 break; 90 } 91 } 92 } 93 94 /* if this entry has not been found, it must be new */ 95 if (!have_entry) { 96 if (acl_new->acl_cnt == ACL_MAX_ENTRIES) { 97 warn("too many ACL entries"); 98 acl_free(acl_new); 99 return -1; 100 } 101 acl_new->acl_entry[acl_new->acl_cnt++] = 102 acl->acl_entry[i]; 103 } 104 } 105 106 if (acl_type == ACL_TYPE_ACCESS) 107 *prev_acl[0] = *acl_new; 108 else 109 *prev_acl[1] = *acl_new; 110 acl_free(acl_new); 111 112 return 0; 113} 114