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04277e02 | 1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
2303f5fd UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
5f0e6fc7 | 4 | |
2303f5fd | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
5f0e6fc7 | 9 | |
2303f5fd UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
5f0e6fc7 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5f0e6fc7 | 18 | |
d71b808a | 19 | #include <errno.h> |
ec999b8e | 20 | #include <libc-lock.h> |
5f0e6fc7 RM |
21 | |
22 | #include "nsswitch.h" | |
23 | ||
24 | /*******************************************************************\ | |
25 | |* Here we assume several symbols to be defined: *| | |
26 | |* *| | |
27 | |* LOOKUP_TYPE - the return type of the function *| | |
28 | |* *| | |
29 | |* SETFUNC_NAME - name of the non-reentrant setXXXent function *| | |
30 | |* *| | |
31 | |* GETFUNC_NAME - name of the non-reentrant getXXXent function *| | |
32 | |* *| | |
33 | |* ENDFUNC_NAME - name of the non-reentrant endXXXent function *| | |
34 | |* *| | |
35 | |* DATABASE_NAME - name of the database the function accesses *| | |
36 | |* (e.g., host, services, ...) *| | |
37 | |* *| | |
38 | |* Optionally the following vars can be defined: *| | |
39 | |* *| | |
40 | |* STAYOPEN - variable declaration for setXXXent function *| | |
41 | |* *| | |
42 | |* STAYOPEN_VAR - variable name for setXXXent function *| | |
43 | |* *| | |
44 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| | |
45 | |* the global `h_errno' variable. *| | |
46 | |* *| | |
47 | \*******************************************************************/ | |
48 | ||
49 | /* To make the real sources a bit prettier. */ | |
50 | #define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME) | |
2303f5fd UD |
51 | #define APPEND_R(Name) CONCAT2_2 (Name, _r) |
52 | #define INTERNAL(Name) CONCAT2_2 (__, Name) | |
53 | #define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post) | |
54 | #define CONCAT2_2(Pre, Post) Pre##Post | |
bff334e0 UD |
55 | #define NEW(name) NEW1 (name) |
56 | #define NEW1(name) __new_##name | |
5f0e6fc7 RM |
57 | |
58 | #define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME) | |
ddc6fb0c | 59 | #define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME) |
5f0e6fc7 RM |
60 | #define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME) |
61 | #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) | |
2303f5fd UD |
62 | #define STRINGIZE(Name) STRINGIZE1 (Name) |
63 | #define STRINGIZE1(Name) #Name | |
5f0e6fc7 | 64 | |
77fe0b9c | 65 | #ifndef DB_LOOKUP_FCT |
384ca551 | 66 | # define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2) |
77fe0b9c UD |
67 | # define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) |
68 | # define CONCAT3_2(Pre, Name, Post) Pre##Name##Post | |
69 | #endif | |
5f0e6fc7 RM |
70 | |
71 | /* Sometimes we need to store error codes in the `h_errno' variable. */ | |
72 | #ifdef NEED_H_ERRNO | |
73 | # define H_ERRNO_PARM , int *h_errnop | |
74 | # define H_ERRNO_VAR , &h_errno | |
8b801829 | 75 | # define H_ERRNO_VAR_P &h_errno |
5f0e6fc7 RM |
76 | #else |
77 | # define H_ERRNO_PARM | |
78 | # define H_ERRNO_VAR | |
8b801829 | 79 | # define H_ERRNO_VAR_P NULL |
5f0e6fc7 RM |
80 | #endif |
81 | ||
82 | /* Some databases take the `stayopen' flag. */ | |
2303f5fd UD |
83 | #ifdef STAYOPEN |
84 | # define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp) | |
8b801829 | 85 | # define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp) |
2303f5fd UD |
86 | #else |
87 | # define STAYOPEN void | |
8b801829 UD |
88 | # define STAYOPEN_VAR 0 |
89 | # define STAYOPEN_TMPVAR NULL | |
5f0e6fc7 RM |
90 | #endif |
91 | ||
8b801829 UD |
92 | #ifndef NEED__RES |
93 | # define NEED__RES 0 | |
94 | #endif | |
5f0e6fc7 RM |
95 | |
96 | /* This handle for the NSS data base is shared between all | |
97 | set/get/endXXXent functions. */ | |
98 | static service_user *nip; | |
d4a089cf UD |
99 | /* Remember the last service used since the last call to `endXXent'. */ |
100 | static service_user *last_nip; | |
5f0e6fc7 RM |
101 | /* Remember the first service_entry, it's always the same. */ |
102 | static service_user *startp; | |
103 | ||
2303f5fd UD |
104 | #ifdef STAYOPEN_TMP |
105 | /* We need to remember the last `stayopen' flag given by the user | |
106 | since the `setent' function is only called for the first available | |
107 | service. */ | |
108 | static STAYOPEN_TMP; | |
109 | #endif | |
110 | ||
5f0e6fc7 | 111 | /* Protect above variable against multiple uses at the same time. */ |
1e16111c | 112 | __libc_lock_define_initialized (static, lock) |
5f0e6fc7 RM |
113 | |
114 | /* The lookup function for the first entry of this service. */ | |
384ca551 | 115 | extern int DB_LOOKUP_FCT (service_user **nip, const char *name, |
b2297409 | 116 | const char *name2, void **fctp); |
37ba7d66 | 117 | libc_hidden_proto (DB_LOOKUP_FCT) |
3dbe1581 | 118 | \f |
5f0e6fc7 | 119 | void |
6dbe2837 | 120 | SETFUNC_NAME (STAYOPEN) |
5f0e6fc7 | 121 | { |
8b801829 | 122 | int save; |
5f0e6fc7 RM |
123 | |
124 | __libc_lock_lock (lock); | |
8b801829 UD |
125 | __nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, |
126 | &last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES); | |
5f0e6fc7 | 127 | |
8b801829 | 128 | save = errno; |
5f0e6fc7 | 129 | __libc_lock_unlock (lock); |
8b801829 | 130 | __set_errno (save); |
5f0e6fc7 RM |
131 | } |
132 | ||
133 | ||
134 | void | |
6dbe2837 | 135 | ENDFUNC_NAME (void) |
5f0e6fc7 | 136 | { |
8b801829 | 137 | int save; |
5f0e6fc7 | 138 | |
226e9fda UD |
139 | /* If the service has not been used before do not do anything. */ |
140 | if (startp != NULL) | |
141 | { | |
142 | __libc_lock_lock (lock); | |
143 | __nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, | |
144 | &last_nip, NEED__RES); | |
145 | save = errno; | |
146 | __libc_lock_unlock (lock); | |
147 | __set_errno (save); | |
148 | } | |
5f0e6fc7 RM |
149 | } |
150 | ||
151 | ||
ba1ffaa1 UD |
152 | int |
153 | INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, | |
154 | LOOKUP_TYPE **result H_ERRNO_PARM) | |
5f0e6fc7 | 155 | { |
8b801829 UD |
156 | int status; |
157 | int save; | |
5f0e6fc7 | 158 | |
3dbe1581 | 159 | __libc_lock_lock (lock); |
8b801829 UD |
160 | status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING, |
161 | DB_LOOKUP_FCT, &nip, &startp, &last_nip, | |
162 | STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer, | |
163 | buflen, (void **) result, H_ERRNO_VAR_P); | |
164 | save = errno; | |
5f0e6fc7 | 165 | __libc_lock_unlock (lock); |
8b801829 UD |
166 | __set_errno (save); |
167 | return status; | |
5f0e6fc7 | 168 | } |
16710d58 RM |
169 | |
170 | ||
deb84c43 UD |
171 | #ifdef NO_COMPAT_NEEDED |
172 | strong_alias (INTERNAL (REENTRANT_GETNAME), REENTRANT_GETNAME); | |
173 | #else | |
174 | # include <shlib-compat.h> | |
175 | # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2) | |
176 | # define OLD(name) OLD1 (name) | |
177 | # define OLD1(name) __old_##name | |
c2fa5b5a UD |
178 | |
179 | int | |
4a381a81 | 180 | attribute_compat_text_section |
c2fa5b5a UD |
181 | OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, |
182 | LOOKUP_TYPE **result H_ERRNO_PARM) | |
183 | { | |
184 | int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen, | |
185 | result H_ERRNO_VAR); | |
186 | ||
187 | if (ret != 0) | |
188 | ret = -1; | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
deb84c43 | 193 | # define do_symbol_version(real, name, version) \ |
16710d58 RM |
194 | compat_symbol (libc, real, name, version) |
195 | do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0); | |
deb84c43 | 196 | # endif |
c2fa5b5a | 197 | |
bff334e0 UD |
198 | /* As INTERNAL (REENTRANT_GETNAME) may be hidden, we need an alias |
199 | in between so that the REENTRANT_GETNAME@@GLIBC_2.1.2 is not | |
200 | hidden too. */ | |
201 | strong_alias (INTERNAL (REENTRANT_GETNAME), NEW (REENTRANT_GETNAME)); | |
202 | ||
deb84c43 | 203 | # define do_default_symbol_version(real, name, version) \ |
16710d58 | 204 | versioned_symbol (libc, real, name, version) |
bff334e0 | 205 | do_default_symbol_version (NEW (REENTRANT_GETNAME), |
16710d58 | 206 | REENTRANT_GETNAME, GLIBC_2_1_2); |
deb84c43 | 207 | #endif |
2f7f7bc6 | 208 | |
01767843 CM |
209 | nss_interface_function (SETFUNC_NAME) |
210 | nss_interface_function (ENDFUNC_NAME) | |
211 | nss_interface_function (REENTRANT_GETNAME) |