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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/* Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include "nscd.h"
int __nss_not_use_nscd_passwd;
static int __nscd_getpw_r (const char *key, request_type type,
struct passwd *resultbuf, char *buffer,
size_t buflen);
int
__nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
size_t buflen)
{
if (name == NULL)
return 1;
return __nscd_getpw_r (name, GETPWBYNAME, resultbuf, buffer, buflen);
}
int
__nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
size_t buflen)
{
char *p = buffer;
int plen;
plen = snprintf (buffer, buflen, "%d", uid);
if (plen == -1)
{
__set_errno (ERANGE);
return -1;
}
p = buffer + plen + 1;
return __nscd_getpw_r (buffer, GETPWBYUID, resultbuf, p, buflen - plen -1);
}
/* Create a socket connected to a name. */
static int
nscd_open_socket (void)
{
struct sockaddr_un addr;
int sock;
int saved_errno = errno;
sock = socket (PF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
{
__set_errno (saved_errno);
return -1;
}
addr.sun_family = AF_UNIX;
strcpy (addr.sun_path, _PATH_NSCDSOCKET);
if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
{
close (sock);
__set_errno (saved_errno);
return -1;
}
return sock;
}
static int
__nscd_getpw_r (const char *key, request_type type, struct passwd *resultbuf,
char *buffer, size_t buflen)
{
int sock = nscd_open_socket ();
request_header req;
pw_response_header pw_resp;
ssize_t nbytes;
if (sock == -1)
{
/* Returning two signals that contacting the daemon failed. */
__nss_not_use_nscd_passwd = 1;
return 1;
}
req.version = NSCD_VERSION;
req.type = type;
req.key_len = strlen (key);
nbytes = write (sock, &req, sizeof (request_header));
if (nbytes != sizeof (request_header))
{
close (sock);
return 1;
}
nbytes = write (sock, key, req.key_len);
if (nbytes != req.key_len)
{
close (sock);
return 1;
}
nbytes = read (sock, &pw_resp, sizeof (pw_response_header));
if (nbytes != sizeof (pw_response_header))
{
close (sock);
return 1;
}
if (pw_resp.found == -1)
{
/* The daemon does not cache this database. */
close (sock);
__nss_not_use_nscd_passwd = 1;
return 1;
}
if (pw_resp.found == 1)
{
struct iovec vec[5];
char *p = buffer;
if (buflen < pw_resp.pw_name_len + 1 + pw_resp.pw_passwd_len + 1
+ pw_resp.pw_gecos_len + 1 + pw_resp.pw_dir_len + 1
+ pw_resp.pw_shell_len + 1)
{
__set_errno (ERANGE);
close (sock);
return -1;
}
/* get pw_name */
vec[0].iov_base = p;
vec[0].iov_len = pw_resp.pw_name_len;
p += pw_resp.pw_name_len + 1;
buflen -= (pw_resp.pw_name_len + 1);
/* get pw_passwd */
vec[1].iov_base = p;
vec[1].iov_len = pw_resp.pw_passwd_len;
p += pw_resp.pw_passwd_len + 1;
buflen -= (pw_resp.pw_passwd_len + 1);
/* get pw_gecos */
vec[2].iov_base = p;
vec[2].iov_len = pw_resp.pw_gecos_len;
p += pw_resp.pw_gecos_len + 1;
buflen -= (pw_resp.pw_gecos_len + 1);
/* get pw_dir */
vec[3].iov_base = p;
vec[3].iov_len = pw_resp.pw_dir_len;
p += pw_resp.pw_dir_len + 1;
buflen -= (pw_resp.pw_dir_len + 1);
/* get pw_pshell */
vec[4].iov_base = p;
vec[4].iov_len = pw_resp.pw_dir_len;
p += pw_resp.pw_dir_len + 1;
buflen -= (pw_resp.pw_dir_len + 1);
nbytes = readv (sock, vec, 5);
if (nbytes != pw_resp.pw_name_len + 1 + pw_resp.pw_passwd_len + 1 +
pw_resp.pw_gecos_len + 1 + pw_resp.pw_dir_len + 1 +
pw_resp.pw_shell_len + 1)
{
close (sock);
return 1;
}
resultbuf->pw_name = vec[0].iov_base;
resultbuf->pw_name[pw_resp.pw_name_len] = '\0';
resultbuf->pw_passwd = vec[1].iov_base;
resultbuf->pw_passwd[pw_resp.pw_passwd_len] = '\0';
resultbuf->pw_uid = pw_resp.pw_uid;
resultbuf->pw_gid = pw_resp.pw_gid;
resultbuf->pw_gecos = vec[2].iov_base;
resultbuf->pw_gecos[pw_resp.pw_gecos_len] = '\0';
resultbuf->pw_dir = vec[3].iov_base;
resultbuf->pw_dir[pw_resp.pw_dir_len] = '\0';
resultbuf->pw_shell = vec[4].iov_base;
resultbuf->pw_shell[pw_resp.pw_shell_len] = '\0';
close (sock);
return 0;
}
else
{
close (sock);
return -1;
}
}
|
