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6d7e8eda | 1 | /* Copyright (C) 1996-2023 Free Software Foundation, Inc. |
2303f5fd | 2 | This file is part of the GNU C Library. |
5f0e6fc7 | 3 | |
2303f5fd | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
5f0e6fc7 | 8 | |
2303f5fd UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
5f0e6fc7 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
5f0e6fc7 | 17 | |
d71b808a | 18 | #include <errno.h> |
ec999b8e | 19 | #include <libc-lock.h> |
5f0e6fc7 RM |
20 | |
21 | #include "nsswitch.h" | |
22 | ||
23 | /*******************************************************************\ | |
24 | |* Here we assume several symbols to be defined: *| | |
25 | |* *| | |
26 | |* LOOKUP_TYPE - the return type of the function *| | |
27 | |* *| | |
28 | |* SETFUNC_NAME - name of the non-reentrant setXXXent function *| | |
29 | |* *| | |
30 | |* GETFUNC_NAME - name of the non-reentrant getXXXent function *| | |
31 | |* *| | |
32 | |* ENDFUNC_NAME - name of the non-reentrant endXXXent function *| | |
33 | |* *| | |
34 | |* DATABASE_NAME - name of the database the function accesses *| | |
35 | |* (e.g., host, services, ...) *| | |
36 | |* *| | |
37 | |* Optionally the following vars can be defined: *| | |
38 | |* *| | |
39 | |* STAYOPEN - variable declaration for setXXXent function *| | |
40 | |* *| | |
41 | |* STAYOPEN_VAR - variable name for setXXXent function *| | |
42 | |* *| | |
43 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| | |
44 | |* the global `h_errno' variable. *| | |
45 | |* *| | |
46 | \*******************************************************************/ | |
47 | ||
48 | /* To make the real sources a bit prettier. */ | |
49 | #define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME) | |
2303f5fd UD |
50 | #define APPEND_R(Name) CONCAT2_2 (Name, _r) |
51 | #define INTERNAL(Name) CONCAT2_2 (__, Name) | |
52 | #define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post) | |
53 | #define CONCAT2_2(Pre, Post) Pre##Post | |
bff334e0 UD |
54 | #define NEW(name) NEW1 (name) |
55 | #define NEW1(name) __new_##name | |
5f0e6fc7 RM |
56 | |
57 | #define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME) | |
ddc6fb0c | 58 | #define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME) |
5f0e6fc7 RM |
59 | #define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME) |
60 | #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) | |
2303f5fd UD |
61 | #define STRINGIZE(Name) STRINGIZE1 (Name) |
62 | #define STRINGIZE1(Name) #Name | |
5f0e6fc7 | 63 | |
77fe0b9c | 64 | #ifndef DB_LOOKUP_FCT |
384ca551 | 65 | # define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2) |
77fe0b9c UD |
66 | # define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) |
67 | # define CONCAT3_2(Pre, Name, Post) Pre##Name##Post | |
68 | #endif | |
5f0e6fc7 RM |
69 | |
70 | /* Sometimes we need to store error codes in the `h_errno' variable. */ | |
71 | #ifdef NEED_H_ERRNO | |
72 | # define H_ERRNO_PARM , int *h_errnop | |
73 | # define H_ERRNO_VAR , &h_errno | |
8b801829 | 74 | # define H_ERRNO_VAR_P &h_errno |
5f0e6fc7 RM |
75 | #else |
76 | # define H_ERRNO_PARM | |
77 | # define H_ERRNO_VAR | |
8b801829 | 78 | # define H_ERRNO_VAR_P NULL |
5f0e6fc7 RM |
79 | #endif |
80 | ||
81 | /* Some databases take the `stayopen' flag. */ | |
2303f5fd UD |
82 | #ifdef STAYOPEN |
83 | # define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp) | |
8b801829 | 84 | # define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp) |
2303f5fd UD |
85 | #else |
86 | # define STAYOPEN void | |
8b801829 UD |
87 | # define STAYOPEN_VAR 0 |
88 | # define STAYOPEN_TMPVAR NULL | |
5f0e6fc7 RM |
89 | #endif |
90 | ||
8b801829 UD |
91 | #ifndef NEED__RES |
92 | # define NEED__RES 0 | |
93 | #endif | |
5f0e6fc7 RM |
94 | |
95 | /* This handle for the NSS data base is shared between all | |
96 | set/get/endXXXent functions. */ | |
f4f3b091 | 97 | static nss_action_list nip; |
d4a089cf | 98 | /* Remember the last service used since the last call to `endXXent'. */ |
f4f3b091 DD |
99 | static nss_action_list last_nip; |
100 | /* Remember the first service_entry across set/get/endent. */ | |
101 | static nss_action_list startp; | |
5f0e6fc7 | 102 | |
2303f5fd UD |
103 | #ifdef STAYOPEN_TMP |
104 | /* We need to remember the last `stayopen' flag given by the user | |
105 | since the `setent' function is only called for the first available | |
106 | service. */ | |
107 | static STAYOPEN_TMP; | |
108 | #endif | |
109 | ||
5f0e6fc7 | 110 | /* Protect above variable against multiple uses at the same time. */ |
1e16111c | 111 | __libc_lock_define_initialized (static, lock) |
5f0e6fc7 RM |
112 | |
113 | /* The lookup function for the first entry of this service. */ | |
f4f3b091 | 114 | extern int DB_LOOKUP_FCT (nss_action_list *nip, const char *name, |
b2297409 | 115 | const char *name2, void **fctp); |
37ba7d66 | 116 | libc_hidden_proto (DB_LOOKUP_FCT) |
3dbe1581 | 117 | \f |
5f0e6fc7 | 118 | void |
6dbe2837 | 119 | SETFUNC_NAME (STAYOPEN) |
5f0e6fc7 | 120 | { |
8b801829 | 121 | int save; |
5f0e6fc7 RM |
122 | |
123 | __libc_lock_lock (lock); | |
8b801829 UD |
124 | __nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, |
125 | &last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES); | |
5f0e6fc7 | 126 | |
8b801829 | 127 | save = errno; |
5f0e6fc7 | 128 | __libc_lock_unlock (lock); |
8b801829 | 129 | __set_errno (save); |
5f0e6fc7 RM |
130 | } |
131 | ||
132 | ||
133 | void | |
6dbe2837 | 134 | ENDFUNC_NAME (void) |
5f0e6fc7 | 135 | { |
8b801829 | 136 | int save; |
5f0e6fc7 | 137 | |
226e9fda UD |
138 | /* If the service has not been used before do not do anything. */ |
139 | if (startp != NULL) | |
140 | { | |
141 | __libc_lock_lock (lock); | |
142 | __nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, | |
143 | &last_nip, NEED__RES); | |
144 | save = errno; | |
145 | __libc_lock_unlock (lock); | |
146 | __set_errno (save); | |
147 | } | |
5f0e6fc7 RM |
148 | } |
149 | ||
150 | ||
ba1ffaa1 UD |
151 | int |
152 | INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, | |
153 | LOOKUP_TYPE **result H_ERRNO_PARM) | |
5f0e6fc7 | 154 | { |
8b801829 UD |
155 | int status; |
156 | int save; | |
5f0e6fc7 | 157 | |
3dbe1581 | 158 | __libc_lock_lock (lock); |
8b801829 UD |
159 | status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING, |
160 | DB_LOOKUP_FCT, &nip, &startp, &last_nip, | |
161 | STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer, | |
162 | buflen, (void **) result, H_ERRNO_VAR_P); | |
163 | save = errno; | |
5f0e6fc7 | 164 | __libc_lock_unlock (lock); |
8b801829 UD |
165 | __set_errno (save); |
166 | return status; | |
5f0e6fc7 | 167 | } |
16710d58 RM |
168 | |
169 | ||
deb84c43 UD |
170 | #ifdef NO_COMPAT_NEEDED |
171 | strong_alias (INTERNAL (REENTRANT_GETNAME), REENTRANT_GETNAME); | |
172 | #else | |
173 | # include <shlib-compat.h> | |
174 | # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2) | |
175 | # define OLD(name) OLD1 (name) | |
176 | # define OLD1(name) __old_##name | |
c2fa5b5a UD |
177 | |
178 | int | |
4a381a81 | 179 | attribute_compat_text_section |
c2fa5b5a UD |
180 | OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, |
181 | LOOKUP_TYPE **result H_ERRNO_PARM) | |
182 | { | |
183 | int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen, | |
184 | result H_ERRNO_VAR); | |
185 | ||
186 | if (ret != 0) | |
187 | ret = -1; | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
deb84c43 | 192 | # define do_symbol_version(real, name, version) \ |
16710d58 RM |
193 | compat_symbol (libc, real, name, version) |
194 | do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0); | |
deb84c43 | 195 | # endif |
c2fa5b5a | 196 | |
bff334e0 UD |
197 | /* As INTERNAL (REENTRANT_GETNAME) may be hidden, we need an alias |
198 | in between so that the REENTRANT_GETNAME@@GLIBC_2.1.2 is not | |
199 | hidden too. */ | |
200 | strong_alias (INTERNAL (REENTRANT_GETNAME), NEW (REENTRANT_GETNAME)); | |
201 | ||
deb84c43 | 202 | # define do_default_symbol_version(real, name, version) \ |
16710d58 | 203 | versioned_symbol (libc, real, name, version) |
bff334e0 | 204 | do_default_symbol_version (NEW (REENTRANT_GETNAME), |
16710d58 | 205 | REENTRANT_GETNAME, GLIBC_2_1_2); |
deb84c43 | 206 | #endif |
2f7f7bc6 | 207 | |
01767843 CM |
208 | nss_interface_function (SETFUNC_NAME) |
209 | nss_interface_function (ENDFUNC_NAME) | |
210 | nss_interface_function (REENTRANT_GETNAME) |