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2cfe49db | 1 | /* Copyright (C) 1996-2002, 2003 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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
5f0e6fc7 | 19 | |
344c67b6 | 20 | #include <assert.h> |
d71b808a | 21 | #include <errno.h> |
b2ab1f5d | 22 | #include <stdbool.h> |
5f0e6fc7 | 23 | #include "nsswitch.h" |
67479a70 UD |
24 | #ifdef USE_NSCD |
25 | # include <nscd/nscd_proto.h> | |
26 | #endif | |
5edb9387 UD |
27 | #ifdef NEED__RES_HCONF |
28 | # include <resolv/res_hconf.h> | |
29 | #endif | |
b43b13ac UD |
30 | #ifdef NEED__RES |
31 | # include <resolv.h> | |
32 | #endif | |
5f0e6fc7 RM |
33 | /*******************************************************************\ |
34 | |* Here we assume several symbols to be defined: *| | |
fb776f3e | 35 | |* *| |
5f0e6fc7 | 36 | |* LOOKUP_TYPE - the return type of the function *| |
fb776f3e | 37 | |* *| |
5f0e6fc7 | 38 | |* FUNCTION_NAME - name of the non-reentrant function *| |
fb776f3e | 39 | |* *| |
5f0e6fc7 RM |
40 | |* DATABASE_NAME - name of the database the function accesses *| |
41 | |* (e.g., host, services, ...) *| | |
fb776f3e | 42 | |* *| |
5f0e6fc7 | 43 | |* ADD_PARAMS - additional parameter, can vary in number *| |
fb776f3e | 44 | |* *| |
5f0e6fc7 | 45 | |* ADD_VARIABLES - names of additional parameter *| |
fb776f3e | 46 | |* *| |
5f0e6fc7 | 47 | |* Optionally the following vars can be defined: *| |
fb776f3e | 48 | |* *| |
5f0e6fc7 RM |
49 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| |
50 | |* the global `h_errno' variable. *| | |
fb776f3e | 51 | |* *| |
5f0e6fc7 | 52 | |* NEED__RES - the global _res variable might be used so we *| |
fb776f3e AJ |
53 | |* will have to initialize it if necessary *| |
54 | |* *| | |
ae81730f | 55 | |* PREPROCESS - code run before anything else *| |
fb776f3e | 56 | |* *| |
ae81730f | 57 | |* POSTPROCESS - code run after the lookup *| |
fb776f3e | 58 | |* *| |
5f0e6fc7 RM |
59 | \*******************************************************************/ |
60 | ||
61 | /* To make the real sources a bit prettier. */ | |
62 | #define REENTRANT_NAME APPEND_R (FUNCTION_NAME) | |
63 | #define APPEND_R(name) APPEND_R1 (name) | |
64 | #define APPEND_R1(name) name##_r | |
23396375 UD |
65 | #define INTERNAL(name) INTERNAL1 (name) |
66 | #define INTERNAL1(name) __##name | |
bff334e0 UD |
67 | #define NEW(name) NEW1 (name) |
68 | #define NEW1(name) __new_##name | |
5f0e6fc7 | 69 | |
d67281a7 UD |
70 | #ifdef USE_NSCD |
71 | # define NSCD_NAME ADD_NSCD (REENTRANT_NAME) | |
72 | # define ADD_NSCD(name) ADD_NSCD1 (name) | |
73 | # define ADD_NSCD1(name) __nscd_##name | |
ac16e905 UD |
74 | # define NOT_USENSCD_NAME ADD_NOT_NSCDUSE (DATABASE_NAME) |
75 | # define ADD_NOT_NSCDUSE(name) ADD_NOT_NSCDUSE1 (name) | |
76 | # define ADD_NOT_NSCDUSE1(name) __nss_not_use_nscd_##name | |
d67281a7 UD |
77 | #endif |
78 | ||
5f0e6fc7 RM |
79 | #define FUNCTION_NAME_STRING STRINGIZE (FUNCTION_NAME) |
80 | #define REENTRANT_NAME_STRING STRINGIZE (REENTRANT_NAME) | |
81 | #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) | |
82 | #define STRINGIZE(name) STRINGIZE1 (name) | |
83 | #define STRINGIZE1(name) #name | |
84 | ||
77fe0b9c UD |
85 | #ifndef DB_LOOKUP_FCT |
86 | # define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup) | |
87 | # define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) | |
88 | # define CONCAT3_2(Pre, Name, Post) Pre##Name##Post | |
89 | #endif | |
5f0e6fc7 RM |
90 | |
91 | /* Sometimes we need to store error codes in the `h_errno' variable. */ | |
92 | #ifdef NEED_H_ERRNO | |
93 | # define H_ERRNO_PARM , int *h_errnop | |
94 | # define H_ERRNO_VAR , h_errnop | |
a5fdf99b | 95 | # define H_ERRNO_VAR_P h_errnop |
5f0e6fc7 RM |
96 | #else |
97 | # define H_ERRNO_PARM | |
98 | # define H_ERRNO_VAR | |
a5fdf99b | 99 | # define H_ERRNO_VAR_P NULL |
5f0e6fc7 RM |
100 | #endif |
101 | ||
a5fdf99b UD |
102 | #ifndef HAVE_TYPE |
103 | # define TYPE_VAR_P NULL | |
104 | # define FLAGS_VAR 0 | |
105 | #endif | |
106 | ||
107 | #ifdef HAVE_AF | |
108 | # define AF_VAR_P &af | |
109 | #else | |
110 | # define AF_VAR_P NULL | |
111 | #endif | |
5f0e6fc7 RM |
112 | |
113 | /* Type of the lookup function we need here. */ | |
899d423e UD |
114 | typedef enum nss_status (*lookup_function) (ADD_PARAMS, LOOKUP_TYPE *, char *, |
115 | size_t, int * H_ERRNO_PARM); | |
5f0e6fc7 | 116 | |
5f0e6fc7 | 117 | /* The lookup function for the first entry of this service. */ |
dff07c4b | 118 | extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp) |
37ba7d66 UD |
119 | internal_function; |
120 | libc_hidden_proto (DB_LOOKUP_FCT) | |
5f0e6fc7 | 121 | |
ea278354 UD |
122 | /* Interval in which we transfer retry to contact the NSCD. */ |
123 | #define NSS_NSCD_RETRY 100 | |
5f0e6fc7 RM |
124 | |
125 | ||
ba1ffaa1 UD |
126 | int |
127 | INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer, | |
128 | size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM) | |
5f0e6fc7 | 129 | { |
c4563d2d | 130 | static service_user *startp; |
5f0e6fc7 RM |
131 | static lookup_function start_fct; |
132 | service_user *nip; | |
fb776f3e AJ |
133 | union |
134 | { | |
135 | lookup_function l; | |
136 | void *ptr; | |
137 | } fct; | |
138 | ||
5f0e6fc7 RM |
139 | int no_more; |
140 | enum nss_status status = NSS_STATUS_UNAVAIL; | |
d67281a7 UD |
141 | #ifdef USE_NSCD |
142 | int nscd_status; | |
143 | #endif | |
b2ab1f5d UD |
144 | #ifdef NEED_H_ERRNO |
145 | bool any_service = false; | |
146 | #endif | |
5f0e6fc7 | 147 | |
ae81730f UD |
148 | #ifdef PREPROCESS |
149 | PREPROCESS; | |
150 | #endif | |
151 | ||
61c162b5 | 152 | #ifdef HANDLE_DIGITS_DOTS |
a5fdf99b UD |
153 | switch (__nss_hostname_digits_dots (name, resbuf, &buffer, NULL, |
154 | buflen, result, &status, | |
155 | TYPE_VAR_P, FLAGS_VAR, AF_VAR_P, | |
156 | H_ERRNO_VAR_P)) | |
d17a729b | 157 | { |
a5fdf99b | 158 | case -1: |
1670698f | 159 | return errno; |
a5fdf99b UD |
160 | case 1: |
161 | goto done; | |
d17a729b | 162 | } |
61c162b5 UD |
163 | #endif |
164 | ||
d67281a7 | 165 | #ifdef USE_NSCD |
ef4d5b32 | 166 | if (NOT_USENSCD_NAME > 0 && ++NOT_USENSCD_NAME > NSS_NSCD_RETRY) |
ac16e905 | 167 | NOT_USENSCD_NAME = 0; |
ea278354 | 168 | |
ac16e905 | 169 | if (!NOT_USENSCD_NAME) |
d67281a7 | 170 | { |
ea278354 UD |
171 | nscd_status = NSCD_NAME (ADD_VARIABLES, resbuf, buffer, buflen |
172 | H_ERRNO_VAR); | |
1670698f | 173 | if (nscd_status >= 0) |
ea278354 UD |
174 | { |
175 | *result = nscd_status == 0 ? resbuf : NULL; | |
176 | return nscd_status; | |
177 | } | |
d67281a7 UD |
178 | } |
179 | #endif | |
180 | ||
5f0e6fc7 RM |
181 | if (startp == NULL) |
182 | { | |
fb776f3e | 183 | no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING, &fct.ptr); |
5f0e6fc7 | 184 | if (no_more) |
8a523922 | 185 | startp = (service_user *) -1l; |
5f0e6fc7 RM |
186 | else |
187 | { | |
188 | startp = nip; | |
fb776f3e | 189 | start_fct = fct.l; |
5f0e6fc7 RM |
190 | |
191 | #ifdef NEED__RES | |
192 | /* The resolver code will really be used so we have to | |
193 | initialize it. */ | |
b43b13ac | 194 | if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1) |
5f0e6fc7 | 195 | { |
adc6ff7f | 196 | *h_errnop = NETDB_INTERNAL; |
afd4eb37 | 197 | *result = NULL; |
1670698f | 198 | return errno; |
5f0e6fc7 RM |
199 | } |
200 | #endif /* need _res */ | |
5edb9387 UD |
201 | #ifdef NEED__RES_HCONF |
202 | if (!_res_hconf.initialized) | |
203 | _res_hconf_init (); | |
204 | #endif /* need _res_hconf */ | |
5f0e6fc7 RM |
205 | } |
206 | } | |
207 | else | |
208 | { | |
fb776f3e | 209 | fct.l = start_fct; |
8a523922 | 210 | no_more = (nip = startp) == (service_user *) -1l; |
5f0e6fc7 RM |
211 | } |
212 | ||
213 | while (no_more == 0) | |
214 | { | |
b2ab1f5d UD |
215 | #ifdef NEED_H_ERRNO |
216 | any_service = true; | |
217 | #endif | |
218 | ||
fb776f3e AJ |
219 | status = DL_CALL_FCT (fct.l, (ADD_VARIABLES, resbuf, buffer, buflen, |
220 | &errno H_ERRNO_VAR)); | |
5f0e6fc7 | 221 | |
ea278354 | 222 | /* The status is NSS_STATUS_TRYAGAIN and errno is ERANGE the |
566efee2 UD |
223 | provided buffer is too small. In this case we should give |
224 | the user the possibility to enlarge the buffer and we should | |
225 | not simply go on with the next service (even if the TRYAGAIN | |
226 | action tells us so). */ | |
227 | if (status == NSS_STATUS_TRYAGAIN | |
228 | #ifdef NEED_H_ERRNO | |
229 | && *h_errnop == NETDB_INTERNAL | |
230 | #endif | |
231 | && errno == ERANGE) | |
232 | break; | |
233 | ||
503054c0 | 234 | no_more = __nss_next (&nip, REENTRANT_NAME_STRING, |
fb776f3e | 235 | &fct.ptr, status, 0); |
5f0e6fc7 RM |
236 | } |
237 | ||
61c162b5 UD |
238 | #ifdef HANDLE_DIGITS_DOTS |
239 | done: | |
240 | #endif | |
ba1ffaa1 | 241 | *result = status == NSS_STATUS_SUCCESS ? resbuf : NULL; |
b2ab1f5d UD |
242 | #ifdef NEED_H_ERRNO |
243 | if (status != NSS_STATUS_SUCCESS && ! any_service) | |
244 | /* We were not able to use any service. */ | |
245 | *h_errnop = NO_RECOVERY; | |
246 | #endif | |
5edb9387 UD |
247 | #ifdef POSTPROCESS |
248 | POSTPROCESS; | |
249 | #endif | |
2cfe49db | 250 | return (status != NSS_STATUS_TRYAGAIN ? 0 |
9bfce4bf RM |
251 | #ifdef NEED_H_ERRNO |
252 | /* These functions only set errno if h_errno is NETDB_INTERNAL. */ | |
253 | : *h_errnop != NETDB_INTERNAL ? EAGAIN | |
254 | #endif | |
255 | : errno); | |
5f0e6fc7 | 256 | } |
23396375 | 257 | |
16710d58 RM |
258 | |
259 | #include <shlib-compat.h> | |
260 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2) | |
c2fa5b5a UD |
261 | #define OLD(name) OLD1 (name) |
262 | #define OLD1(name) __old_##name | |
263 | ||
264 | int | |
265 | OLD (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer, | |
266 | size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM) | |
267 | { | |
268 | int ret = INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, resbuf, buffer, | |
fb776f3e | 269 | buflen, result H_ERRNO_VAR); |
c2fa5b5a | 270 | |
2cfe49db | 271 | if (ret != 0 || result == NULL) |
c2fa5b5a UD |
272 | ret = -1; |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | #define do_symbol_version(real, name, version) \ | |
16710d58 | 278 | compat_symbol (libc, real, name, version) |
47963d10 | 279 | do_symbol_version (OLD (REENTRANT_NAME), REENTRANT_NAME, GLIBC_2_0); |
deb7f0b4 | 280 | #endif |
c2fa5b5a | 281 | |
bff334e0 UD |
282 | /* As INTERNAL (REENTRANT_NAME) may be hidden, we need an alias |
283 | in between so that the REENTRANT_NAME@@GLIBC_2.1.2 is not | |
284 | hidden too. */ | |
285 | strong_alias (INTERNAL (REENTRANT_NAME), NEW (REENTRANT_NAME)); | |
286 | ||
c2fa5b5a | 287 | #define do_default_symbol_version(real, name, version) \ |
16710d58 | 288 | versioned_symbol (libc, real, name, version) |
bff334e0 | 289 | do_default_symbol_version (NEW (REENTRANT_NAME), |
16710d58 | 290 | REENTRANT_NAME, GLIBC_2_1_2); |