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a5fdf99b | 1 | /* Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
26761c28 | 2 | This file is part of the GNU C Library. |
5f0e6fc7 | 3 | |
26761c28 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
5f0e6fc7 | 8 | |
26761c28 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 | |
12 | Library General Public License for more details. | |
5f0e6fc7 | 13 | |
26761c28 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
5f0e6fc7 | 18 | |
344c67b6 | 19 | #include <assert.h> |
26761c28 | 20 | #include <errno.h> |
5107cf1d | 21 | #include <bits/libc-lock.h> |
26761c28 | 22 | #include <stdlib.h> |
b43b13ac | 23 | #include <resolv.h> |
26761c28 UD |
24 | |
25 | #include "nsswitch.h" | |
5f0e6fc7 RM |
26 | |
27 | /*******************************************************************\ | |
28 | |* Here we assume several symbols to be defined: *| | |
6b9fecdc | 29 | |* *| |
5f0e6fc7 | 30 | |* LOOKUP_TYPE - the return type of the function *| |
6b9fecdc | 31 | |* *| |
5f0e6fc7 | 32 | |* FUNCTION_NAME - name of the non-reentrant function *| |
6b9fecdc | 33 | |* *| |
5f0e6fc7 RM |
34 | |* DATABASE_NAME - name of the database the function accesses *| |
35 | |* (e.g., host, services, ...) *| | |
6b9fecdc | 36 | |* *| |
5f0e6fc7 | 37 | |* ADD_PARAMS - additional parameter, can vary in number *| |
6b9fecdc | 38 | |* *| |
5f0e6fc7 | 39 | |* ADD_VARIABLES - names of additional parameter *| |
6b9fecdc | 40 | |* *| |
5f0e6fc7 RM |
41 | |* BUFLEN - length of buffer allocated for the non *| |
42 | |* reentrant version *| | |
6b9fecdc | 43 | |* *| |
5f0e6fc7 | 44 | |* Optionally the following vars can be defined: *| |
6b9fecdc | 45 | |* *| |
5f0e6fc7 RM |
46 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| |
47 | |* the global `h_errno' variable. *| | |
6b9fecdc | 48 | |* *| |
5f0e6fc7 RM |
49 | \*******************************************************************/ |
50 | ||
51 | /* To make the real sources a bit prettier. */ | |
52 | #define REENTRANT_NAME APPEND_R (FUNCTION_NAME) | |
53 | #define APPEND_R(name) APPEND_R1 (name) | |
54 | #define APPEND_R1(name) name##_r | |
23396375 UD |
55 | #define INTERNAL(name) INTERNAL1 (name) |
56 | #define INTERNAL1(name) __##name | |
5f0e6fc7 RM |
57 | |
58 | /* Sometimes we need to store error codes in the `h_errno' variable. */ | |
59 | #ifdef NEED_H_ERRNO | |
60 | # define H_ERRNO_PARM , int *h_errnop | |
54d79e99 | 61 | # define H_ERRNO_VAR , &h_errno_tmp |
a5fdf99b | 62 | # define H_ERRNO_VAR_P &h_errno_tmp |
5f0e6fc7 RM |
63 | #else |
64 | # define H_ERRNO_PARM | |
65 | # define H_ERRNO_VAR | |
a5fdf99b | 66 | # define H_ERRNO_VAR_P NULL |
5f0e6fc7 RM |
67 | #endif |
68 | ||
a5fdf99b UD |
69 | #ifndef HAVE_TYPE |
70 | # define TYPE_VAR_P NULL | |
71 | # define FLAGS_VAR 0 | |
72 | #endif | |
73 | ||
74 | #ifdef HAVE_AF | |
75 | # define AF_VAR_P &af | |
76 | #else | |
77 | # define AF_VAR_P NULL | |
78 | #endif | |
5f0e6fc7 RM |
79 | |
80 | /* Prototype for reentrant version we use here. */ | |
ba1ffaa1 UD |
81 | extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, |
82 | char *buffer, size_t buflen, | |
83 | LOOKUP_TYPE **result H_ERRNO_PARM); | |
5f0e6fc7 | 84 | |
26761c28 UD |
85 | /* We need to protect the dynamic buffer handling. */ |
86 | __libc_lock_define_initialized (static, lock); | |
87 | ||
d60d215c UD |
88 | /* This points to the static buffer used. */ |
89 | static char *buffer; | |
90 | ||
26761c28 | 91 | |
5f0e6fc7 RM |
92 | LOOKUP_TYPE * |
93 | FUNCTION_NAME (ADD_PARAMS) | |
94 | { | |
26761c28 | 95 | static size_t buffer_size; |
ba1ffaa1 UD |
96 | static LOOKUP_TYPE resbuf; |
97 | LOOKUP_TYPE *result; | |
26761c28 | 98 | int save; |
54d79e99 UD |
99 | #ifdef NEED_H_ERRNO |
100 | int h_errno_tmp = 0; | |
101 | #endif | |
26761c28 UD |
102 | |
103 | /* Get lock. */ | |
104 | __libc_lock_lock (lock); | |
105 | ||
106 | if (buffer == NULL) | |
107 | { | |
108 | buffer_size = BUFLEN; | |
109 | buffer = malloc (buffer_size); | |
110 | } | |
111 | ||
a5fdf99b | 112 | #ifdef HANDLE_DIGITS_DOTS |
61c162b5 UD |
113 | if (buffer != NULL) |
114 | { | |
a5fdf99b UD |
115 | if (__nss_hostname_digits_dots (name, &resbuf, &buffer, |
116 | &buffer_size, | |
117 | 0, &result, NULL, TYPE_VAR_P, | |
118 | FLAGS_VAR, AF_VAR_P, | |
119 | H_ERRNO_VAR_P)) | |
120 | goto done; | |
61c162b5 | 121 | } |
a5fdf99b | 122 | #endif |
61c162b5 | 123 | |
26761c28 | 124 | while (buffer != NULL |
1670698f UD |
125 | && (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer, |
126 | buffer_size, &result H_ERRNO_VAR) | |
127 | == ERANGE) | |
e4cf5070 UD |
128 | #ifdef NEED_H_ERRNO |
129 | && h_errno_tmp == NETDB_INTERNAL | |
130 | #endif | |
1670698f | 131 | ) |
26761c28 UD |
132 | { |
133 | char *new_buf; | |
134 | buffer_size += BUFLEN; | |
135 | new_buf = realloc (buffer, buffer_size); | |
136 | if (new_buf == NULL) | |
e4cf5070 UD |
137 | { |
138 | /* We are out of memory. Free the current buffer so that the | |
139 | process gets a chance for a normal termination. */ | |
140 | save = errno; | |
141 | free (buffer); | |
142 | __set_errno (save); | |
143 | } | |
26761c28 UD |
144 | buffer = new_buf; |
145 | } | |
5f0e6fc7 | 146 | |
22d57dd3 UD |
147 | if (buffer == NULL) |
148 | result = NULL; | |
149 | ||
61c162b5 UD |
150 | #ifdef HANDLE_DIGITS_DOTS |
151 | done: | |
152 | #endif | |
26761c28 UD |
153 | /* Release lock. Preserve error value. */ |
154 | save = errno; | |
155 | __libc_lock_unlock (lock); | |
156 | __set_errno (save); | |
ba1ffaa1 | 157 | |
54d79e99 UD |
158 | #ifdef NEED_H_ERRNO |
159 | if (h_errno_tmp != 0) | |
160 | __set_h_errno (h_errno_tmp); | |
161 | #endif | |
162 | ||
ba1ffaa1 | 163 | return result; |
5f0e6fc7 | 164 | } |
d60d215c UD |
165 | |
166 | ||
167 | /* Free all resources if necessary. */ | |
168 | static void __attribute__ ((unused)) | |
169 | free_mem (void) | |
170 | { | |
6b9fecdc | 171 | free (buffer); |
d60d215c UD |
172 | } |
173 | ||
174 | text_set_element (__libc_subfreeres, free_mem); |