1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* BSD 3-Clause License
*
* Copyright (c) 2007, Stefan Metzmacher <metze@samba.org>
* Copyright (c) 2009, Guenther Deschner <gd@samba.org>
* Copyright (c) 2014-2015, Michael Adam <obnox@samba.org>
* Copyright (c) 2015, Robin Hack <hack.robin@gmail.com>
* Copyright (c) 2013-2018, Andreas Schneider <asn@samba.org>
* 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.
*
* 3. Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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 <errno.h>
#include <grp.h>
#include <string.h>
#include <stdint.h>
#include "nss_utils.h"
int nwrap_gr_copy_r(const struct group *src, struct group *dst,
char *buf, size_t buflen, struct group **dstp)
{
char *p = NULL;
uintptr_t align = 0;
unsigned int gr_mem_cnt = 0;
unsigned i;
size_t total_len;
size_t gr_name_len = strlen(src->gr_name) + 1;
size_t gr_passwd_len = strlen(src->gr_passwd) + 1;
union {
char *ptr;
char **data;
} g_mem;
for (i = 0; src->gr_mem[i] != NULL; i++) {
gr_mem_cnt++;
}
/* Align the memory for storing pointers */
align = __alignof__(char *) - ((p - (char *)0) % __alignof__(char *));
total_len = align +
(1 + gr_mem_cnt) * sizeof(char *) +
gr_name_len + gr_passwd_len;
if (total_len > buflen) {
errno = ERANGE;
return -1;
}
buflen -= total_len;
/* gr_mem */
p = buf + align;
g_mem.ptr = p;
dst->gr_mem = g_mem.data;
/* gr_name */
p += (1 + gr_mem_cnt) * sizeof(char *);
dst->gr_name = p;
/* gr_passwd */
p += gr_name_len;
dst->gr_passwd = p;
/* gr_mem[x] */
p += gr_passwd_len;
/* gr_gid */
dst->gr_gid = src->gr_gid;
memcpy(dst->gr_name, src->gr_name, gr_name_len);
memcpy(dst->gr_passwd, src->gr_passwd, gr_passwd_len);
/* Set the terminating entry */
dst->gr_mem[gr_mem_cnt] = NULL;
/* Now add the group members content */
total_len = 0;
for (i = 0; i < gr_mem_cnt; i++) {
size_t len = strlen(src->gr_mem[i]) + 1;
dst->gr_mem[i] = p;
total_len += len;
p += len;
}
if (total_len > buflen) {
errno = ERANGE;
return -1;
}
for (i = 0; i < gr_mem_cnt; i++) {
size_t len = strlen(src->gr_mem[i]) + 1;
memcpy(dst->gr_mem[i],
src->gr_mem[i],
len);
}
if (dstp != NULL) {
*dstp = dst;
}
return 0;
}
|
