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
212
213
214
215
216
|
/* Copyright (C) 2000, 2002, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <netdb.h>
#include "nsswitch.h"
/* Set up NIP to run through the services. If ALL is zero, use NIP's
current location if it's not nil. Return nonzero if there are no
services (left). */
static int
setup (const char *func_name, db_lookup_function lookup_fct,
void **fctp, service_user **nip, service_user **startp, int all)
{
int no_more;
if (*startp == NULL)
{
no_more = lookup_fct (nip, func_name, NULL, fctp);
*startp = no_more ? (service_user *) -1l : *nip;
}
else if (*startp == (service_user *) -1l)
/* No services at all. */
return 1;
else
{
if (all || !*nip)
/* Reset to the beginning of the service list. */
*nip = *startp;
/* Look up the first function. */
no_more = __nss_lookup (nip, func_name, NULL, fctp);
}
return no_more;
}
void
__nss_setent (const char *func_name, db_lookup_function lookup_fct,
service_user **nip, service_user **startp,
service_user **last_nip, int stayopen, int *stayopen_tmp,
int res)
{
union
{
setent_function f;
void *ptr;
} fct;
int no_more;
if (res && __res_maybe_init (&_res, 0) == -1)
{
__set_h_errno (NETDB_INTERNAL);
return;
}
/* Cycle through the services and run their `setXXent' functions until
we find an available service. */
no_more = setup (func_name, lookup_fct, &fct.ptr, nip,
startp, 1);
while (! no_more)
{
int is_last_nip = *nip == *last_nip;
enum nss_status status;
if (stayopen_tmp)
status = DL_CALL_FCT (fct.f, (*stayopen_tmp));
else
status = DL_CALL_FCT (fct.f, (0));
no_more = __nss_next2 (nip, func_name, NULL, &fct.ptr, status, 0);
if (is_last_nip)
*last_nip = *nip;
}
if (stayopen_tmp)
*stayopen_tmp = stayopen;
}
void
__nss_endent (const char *func_name, db_lookup_function lookup_fct,
service_user **nip, service_user **startp,
service_user **last_nip, int res)
{
union
{
endent_function f;
void *ptr;
} fct;
int no_more;
if (res && __res_maybe_init (&_res, 0) == -1)
{
__set_h_errno (NETDB_INTERNAL);
return;
}
/* Cycle through all the services and run their endXXent functions. */
no_more = setup (func_name, lookup_fct, &fct.ptr, nip, startp, 1);
while (! no_more)
{
/* Ignore status, we force check in __NSS_NEXT. */
DL_CALL_FCT (fct.f, ());
if (*nip == *last_nip)
/* We have processed all services which were used. */
break;
no_more = __nss_next2 (nip, func_name, NULL, &fct.ptr, 0, 1);
}
*last_nip = *nip = NULL;
}
int
__nss_getent_r (const char *getent_func_name,
const char *setent_func_name,
db_lookup_function lookup_fct,
service_user **nip, service_user **startp,
service_user **last_nip, int *stayopen_tmp, int res,
void *resbuf, char *buffer, size_t buflen,
void **result, int *h_errnop)
{
union
{
getent_function f;
void *ptr;
} fct;
int no_more;
enum nss_status status;
if (res && __res_maybe_init (&_res, 0) == -1)
{
*h_errnop = NETDB_INTERNAL;
*result = NULL;
return errno;
}
/* Initialize status to return if no more functions are found. */
status = NSS_STATUS_NOTFOUND;
/* Run through available functions, starting with the same function last
run. We will repeat each function as long as it succeeds, and then go
on to the next service action. */
no_more = setup (getent_func_name, lookup_fct, &fct.ptr, nip,
startp, 0);
while (! no_more)
{
int is_last_nip = *nip == *last_nip;
status = DL_CALL_FCT (fct.f,
(resbuf, buffer, buflen, &errno, &h_errno));
/* The the status is NSS_STATUS_TRYAGAIN and errno is ERANGE the
provided buffer is too small. In this case we should give
the user the possibility to enlarge the buffer and we should
not simply go on with the next service (even if the TRYAGAIN
action tells us so). */
if (status == NSS_STATUS_TRYAGAIN
&& (h_errnop == NULL || *h_errnop == NETDB_INTERNAL)
&& errno == ERANGE)
break;
do
{
no_more = __nss_next2 (nip, getent_func_name, NULL, &fct.ptr,
status, 0);
if (is_last_nip)
*last_nip = *nip;
if (! no_more)
{
/* Call the `setXXent' function. This wasn't done before. */
union
{
setent_function f;
void *ptr;
} sfct;
no_more = __nss_lookup (nip, setent_func_name, NULL, &sfct.ptr);
if (! no_more)
{
if (stayopen_tmp)
status = DL_CALL_FCT (sfct.f, (*stayopen_tmp));
else
status = DL_CALL_FCT (sfct.f, (0));
}
else
status = NSS_STATUS_NOTFOUND;
}
}
while (! no_more && status != NSS_STATUS_SUCCESS);
}
*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
return (status == NSS_STATUS_SUCCESS ? 0
: status != NSS_STATUS_TRYAGAIN ? ENOENT
/* h_errno functions only set errno if h_errno is NETDB_INTERNAL. */
: (h_errnop == NULL || *h_errnop == NETDB_INTERNAL) ? errno
: EAGAIN);
}
|
