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1 | /* Copyright (C) 1996-2015 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
8 | ||
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 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <ctype.h> | |
19 | #include <errno.h> | |
20 | #include <stdio.h> | |
21 | #include <stdio_ext.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <bits/libc-lock.h> | |
25 | ||
26 | #include <libnsl.h> | |
27 | ||
28 | ||
29 | /* Path of the file. */ | |
30 | static const char default_nss[] = "/etc/default/nss"; | |
31 | ||
32 | /* Flags once read from the file. */ | |
33 | static int default_nss_flags; | |
34 | ||
35 | /* Code to make sure we call 'init' once. */ | |
36 | __libc_once_define (static, once); | |
37 | ||
38 | /* Table of the recognized variables. */ | |
39 | static const struct | |
40 | { | |
41 | char name[23]; | |
42 | unsigned int len; | |
43 | int flag; | |
44 | } vars[] = | |
45 | { | |
46 | #define STRNLEN(s) s, sizeof (s) - 1 | |
47 | { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE }, | |
48 | { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE }, | |
49 | { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ }, | |
50 | { STRNLEN ("ADJUNCT_AS_SHADOW"), NSS_FLAG_ADJUNCT_AS_SHADOW }, | |
51 | }; | |
52 | #define nvars (sizeof (vars) / sizeof (vars[0])) | |
53 | ||
54 | ||
55 | static void | |
56 | init (void) | |
57 | { | |
58 | int saved_errno = errno; | |
59 | FILE *fp = fopen (default_nss, "rce"); | |
60 | if (fp != NULL) | |
61 | { | |
62 | char *line = NULL; | |
63 | size_t linelen = 0; | |
64 | ||
65 | __fsetlocking (fp, FSETLOCKING_BYCALLER); | |
66 | ||
67 | while (!feof_unlocked (fp)) | |
68 | { | |
69 | ssize_t n = getline (&line, &linelen, fp); | |
70 | if (n <= 0) | |
71 | break; | |
72 | ||
73 | /* Recognize only | |
74 | ||
75 | <THE-VARIABLE> = TRUE | |
76 | ||
77 | with arbitrary white spaces. */ | |
78 | char *cp = line; | |
79 | while (isspace (*cp)) | |
80 | ++cp; | |
81 | ||
82 | /* Recognize comment lines. */ | |
83 | if (*cp == '#') | |
84 | continue; | |
85 | ||
86 | int idx; | |
87 | for (idx = 0; idx < nvars; ++idx) | |
88 | if (strncmp (cp, vars[idx].name, vars[idx].len) == 0) | |
89 | break; | |
90 | if (idx == nvars) | |
91 | continue; | |
92 | ||
93 | cp += vars[idx].len; | |
94 | while (isspace (*cp)) | |
95 | ++cp; | |
96 | if (*cp++ != '=') | |
97 | continue; | |
98 | while (isspace (*cp)) | |
99 | ++cp; | |
100 | ||
101 | if (strncmp (cp, "TRUE", 4) != 0) | |
102 | continue; | |
103 | cp += 4; | |
104 | ||
105 | while (isspace (*cp)) | |
106 | ++cp; | |
107 | ||
108 | if (*cp == '\0') | |
109 | default_nss_flags |= vars[idx].flag; | |
110 | } | |
111 | ||
112 | free (line); | |
113 | ||
114 | fclose (fp); | |
115 | } | |
116 | __set_errno (saved_errno); | |
117 | } | |
118 | ||
119 | ||
120 | int | |
121 | _nsl_default_nss (void) | |
122 | { | |
123 | /* If we have not yet read the file yet do it now. */ | |
124 | __libc_once (once, init); | |
125 | ||
126 | return default_nss_flags; | |
127 | } |