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312be3f9 UD |
1 | /* Copyright (C) 1996,2001,2004,2006,2007,2010,2011 |
2 | Free Software Foundation, Inc. | |
433f49c4 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
9 | ||
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
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. */ | |
19 | ||
20 | #include <ctype.h> | |
57c9179c | 21 | #include <errno.h> |
433f49c4 UD |
22 | #include <stdio.h> |
23 | #include <stdio_ext.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <bits/libc-lock.h> | |
27 | ||
28 | #include <libnsl.h> | |
29 | ||
30 | ||
31 | /* Path of the file. */ | |
32 | static const char default_nss[] = "/etc/default/nss"; | |
33 | ||
34 | /* Flags once read from the file. */ | |
35 | static int default_nss_flags; | |
36 | ||
37 | /* Code to make sure we call 'init' once. */ | |
38 | __libc_once_define (static, once); | |
39 | ||
ee821689 UD |
40 | /* Table of the recognized variables. */ |
41 | static const struct | |
42 | { | |
43 | char name[23]; | |
44 | unsigned int len; | |
45 | int flag; | |
46 | } vars[] = | |
47 | { | |
48 | #define STRNLEN(s) s, sizeof (s) - 1 | |
49 | { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE }, | |
4eaa9bb4 | 50 | { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE }, |
71170aa0 UD |
51 | { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ }, |
52 | { STRNLEN ("ADJUNCT_AS_SHADOW"), NSS_FLAG_ADJUNCT_AS_SHADOW }, | |
ee821689 UD |
53 | }; |
54 | #define nvars (sizeof (vars) / sizeof (vars[0])) | |
55 | ||
433f49c4 UD |
56 | |
57 | static void | |
58 | init (void) | |
59 | { | |
57c9179c | 60 | int saved_errno = errno; |
312be3f9 | 61 | FILE *fp = fopen (default_nss, "rce"); |
433f49c4 UD |
62 | if (fp != NULL) |
63 | { | |
64 | char *line = NULL; | |
65 | size_t linelen = 0; | |
66 | ||
67 | __fsetlocking (fp, FSETLOCKING_BYCALLER); | |
68 | ||
69 | while (!feof_unlocked (fp)) | |
70 | { | |
71 | ssize_t n = getline (&line, &linelen, fp); | |
72 | if (n <= 0) | |
73 | break; | |
74 | ||
ee821689 | 75 | /* Recognize only |
433f49c4 | 76 | |
ee821689 | 77 | <THE-VARIABLE> = TRUE |
433f49c4 UD |
78 | |
79 | with arbitrary white spaces. */ | |
80 | char *cp = line; | |
81 | while (isspace (*cp)) | |
82 | ++cp; | |
83 | ||
84 | /* Recognize comment lines. */ | |
85 | if (*cp == '#') | |
86 | continue; | |
87 | ||
ee821689 UD |
88 | int idx; |
89 | for (idx = 0; idx < nvars; ++idx) | |
90 | if (strncmp (cp, vars[idx].name, vars[idx].len) == 0) | |
91 | break; | |
92 | if (idx == nvars) | |
433f49c4 UD |
93 | continue; |
94 | ||
ee821689 | 95 | cp += vars[idx].len; |
433f49c4 UD |
96 | while (isspace (*cp)) |
97 | ++cp; | |
98 | if (*cp++ != '=') | |
99 | continue; | |
100 | while (isspace (*cp)) | |
101 | ++cp; | |
102 | ||
103 | if (strncmp (cp, "TRUE", 4) != 0) | |
104 | continue; | |
105 | cp += 4; | |
106 | ||
107 | while (isspace (*cp)) | |
108 | ++cp; | |
109 | ||
110 | if (*cp == '\0') | |
ee821689 | 111 | default_nss_flags |= vars[idx].flag; |
433f49c4 UD |
112 | } |
113 | ||
114 | free (line); | |
115 | ||
116 | fclose (fp); | |
117 | } | |
57c9179c | 118 | __set_errno (saved_errno); |
433f49c4 UD |
119 | } |
120 | ||
121 | ||
122 | int | |
123 | _nsl_default_nss (void) | |
124 | { | |
125 | /* If we have not yet read the file yet do it now. */ | |
126 | __libc_once (once, init); | |
127 | ||
128 | return default_nss_flags; | |
129 | } |