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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
Unix SMB/CIFS implementation.
Safe versions of getpw* calls
Copyright (C) Andrew Bartlett 2002
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
static struct passwd *alloc_copy_passwd(const struct passwd *from)
{
struct passwd *ret = SMB_XMALLOC_P(struct passwd);
ZERO_STRUCTP(ret);
ret->pw_name = smb_xstrdup(from->pw_name);
ret->pw_passwd = smb_xstrdup(from->pw_passwd);
ret->pw_uid = from->pw_uid;
ret->pw_gid = from->pw_gid;
ret->pw_gecos = smb_xstrdup(from->pw_gecos);
ret->pw_dir = smb_xstrdup(from->pw_dir);
ret->pw_shell = smb_xstrdup(from->pw_shell);
return ret;
}
void passwd_free (struct passwd **buf)
{
if (!*buf) {
DEBUG(0, ("attempted double-free of allocated passwd\n"));
return;
}
SAFE_FREE((*buf)->pw_name);
SAFE_FREE((*buf)->pw_passwd);
SAFE_FREE((*buf)->pw_gecos);
SAFE_FREE((*buf)->pw_dir);
SAFE_FREE((*buf)->pw_shell);
SAFE_FREE(*buf);
}
#define PWNAMCACHE_SIZE 4
static struct passwd *pwnam_cache[PWNAMCACHE_SIZE];
static BOOL pwnam_cache_initialized = False;
static void init_pwnam_cache(void)
{
int i;
if (pwnam_cache_initialized)
return;
for (i=0; i<PWNAMCACHE_SIZE; i++)
pwnam_cache[i] = NULL;
pwnam_cache_initialized = True;
return;
}
void flush_pwnam_cache(void)
{
int i;
init_pwnam_cache();
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if (pwnam_cache[i] == NULL)
continue;
passwd_free(&pwnam_cache[i]);
}
}
struct passwd *getpwnam_alloc(const char *name)
{
int i;
struct passwd *temp;
init_pwnam_cache();
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if ((pwnam_cache[i] != NULL) &&
(strcmp(name, pwnam_cache[i]->pw_name) == 0)) {
DEBUG(10, ("Got %s from pwnam_cache\n", name));
return alloc_copy_passwd(pwnam_cache[i]);
}
}
temp = sys_getpwnam(name);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
return NULL;
}
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if (pwnam_cache[i] == NULL)
break;
}
if (i == PWNAMCACHE_SIZE)
i = rand() % PWNAMCACHE_SIZE;
if (pwnam_cache[i] != NULL)
passwd_free(&pwnam_cache[i]);
pwnam_cache[i] = alloc_copy_passwd(temp);
return alloc_copy_passwd(temp);
}
struct passwd *getpwuid_alloc(uid_t uid)
{
struct passwd *temp;
temp = sys_getpwuid(uid);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
return NULL;
}
return alloc_copy_passwd(temp);
}
|
