merge.c revision 75928 
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 75928 2001-04-24 22:45:41Z jedgar $
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_entry_t entry, entry_new;
44	acl_permset_t permset;
45	acl_t acl_new;
46	acl_tag_t tag, tag_new;
47	int entry_id, entry_id_new, have_entry;
48	uid_t *id, *id_new;
49
50	if (acl_type == ACL_TYPE_ACCESS)
51		acl_new = acl_dup(prev_acl[0]);
52	else
53		acl_new = acl_dup(prev_acl[1]);
54	if (!acl_new)
55		err(EX_OSERR, "acl_dup() failed");
56
57	entry_id = ACL_FIRST_ENTRY;
58
59	while (acl_get_entry(acl, entry_id, &entry) == 1) {
60		entry_id = ACL_NEXT_ENTRY;
61		have_entry = 0;
62
63		/* keep track of existing ACL_MASK entries */
64		if (acl_get_tag_type(entry, &tag) == -1)
65			err(EX_OSERR,
66			    "acl_get_tag_type() failed - invalid ACL entry");
67		if (tag == ACL_MASK)
68			have_mask = 1;
69
70		/* check against the existing ACL entries */
71		entry_id_new = ACL_FIRST_ENTRY;
72		while (!have_entry &&
73		    acl_get_entry(acl_new, entry_id_new, &entry_new) == 1) {
74			entry_id_new = ACL_NEXT_ENTRY;
75
76			if (acl_get_tag_type(entry, &tag) == -1)
77				err(EX_OSERR, "acl_get_tag_type() failed");
78			if (acl_get_tag_type(entry_new, &tag_new) == -1)
79				err(EX_OSERR, "acl_get_tag_type() failed");
80			if (tag != tag_new)
81				continue;
82
83			switch(tag) {
84			case ACL_USER:
85			case ACL_GROUP:
86				id = acl_get_qualifier(entry);
87				if (id == NULL)
88					err(EX_OSERR,
89					    "acl_get_qualifier() failed");
90				id_new = acl_get_qualifier(entry_new);
91				if (id_new == NULL)
92					err(EX_OSERR,
93					    "acl_get_qualifier() failed");
94				if (*id == *id_new) {
95					/* any other matches */
96					if (acl_get_permset(entry, &permset)
97					    == -1)
98						err(EX_OSERR,
99						    "acl_get_permset() failed");
100					if (acl_set_permset(entry_new, permset)
101					    == -1)
102						err(EX_OSERR,
103						    "acl_set_permset() failed");
104					have_entry = 1;
105				}
106				acl_free(id);
107				acl_free(id_new);
108				if (!have_entry)
109					break;
110				/* FALLTHROUGH */
111			case ACL_USER_OBJ:
112			case ACL_GROUP_OBJ:
113			case ACL_OTHER:
114			case ACL_MASK:
115				if (acl_get_permset(entry, &permset) == -1)
116					err(EX_OSERR,
117					    "acl_get_permset() failed");
118				if (acl_set_permset(entry_new, permset) == -1)
119					err(EX_OSERR,
120					    "acl_set_permset() failed");
121				have_entry = 1;
122				break;
123			default:
124				/* should never be here */
125				errx(EX_OSERR, "Invalid tag type: %i", tag);
126				break;
127			}
128		}
129
130		/* if this entry has not been found, it must be new */
131		if (!have_entry) {
132			if (acl_create_entry(&acl_new, &entry_new) == -1) {
133				acl_free(acl_new);
134				return -1;
135			}
136			if (acl_copy_entry(entry_new, entry) == -1)
137				err(EX_OSERR, "acl_copy_entry() failed");
138		}
139	}
140
141
142	if (acl_type == ACL_TYPE_ACCESS) {
143		acl_free(prev_acl[0]);
144		prev_acl[0] = acl_new;
145	} else {
146		acl_free(prev_acl[1]);
147		prev_acl[1] = acl_new;
148	}
149
150
151	return 0;
152}
153