1/* Copyright (c) 1998-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; version 2 of the License, or
8 (at your option) any later version.
9
10 This program 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
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <https://www.gnu.org/licenses/>. */
17
18#include <ctype.h>
19#include <errno.h>
20#include <error.h>
21#include <libintl.h>
22#include <malloc.h>
23#include <pwd.h>
24#include <stdio.h>
25#include <stdio_ext.h>
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29#include <sys/param.h>
30#include <sys/types.h>
31
32#include "dbg_log.h"
33#include "nscd.h"
34
35
36/* Names of the databases. */
37const char *const dbnames[lastdb] =
38{
39 [pwddb] = "passwd",
40 [grpdb] = "group",
41 [hstdb] = "hosts",
42 [servdb] = "services",
43 [netgrdb] = "netgroup"
44};
45
46
47static int
48find_db (const char *name)
49{
50 for (int cnt = 0; cnt < lastdb; ++cnt)
51 if (strcmp (name, dbnames[cnt]) == 0)
52 return cnt;
53
54 error (0, 0, _("database %s is not supported"), name);
55 return -1;
56}
57
58int
59nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
60{
61 FILE *fp;
62 char *line, *cp, *entry, *arg1, *arg2;
63 size_t len;
64 int cnt;
65 const unsigned int initial_error_message_count = error_message_count;
66
67 /* Open the configuration file. */
68 fp = fopen (fname, "r");
69 if (fp == NULL)
70 return -1;
71
72 /* The stream is not used by more than one thread. */
73 (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
74
75 line = NULL;
76 len = 0;
77
78 do
79 {
80 ssize_t n = getline (&line, &len, fp);
81 if (n < 0)
82 break;
83 if (line[n - 1] == '\n')
84 line[n - 1] = '\0';
85
86 /* Because the file format does not know any form of quoting we
87 can search forward for the next '#' character and if found
88 make it terminating the line. */
89 *strchrnul (line, '#') = '\0';
90
91 /* If the line is blank it is ignored. */
92 if (line[0] == '\0')
93 continue;
94
95 entry = line;
96 while (isspace (*entry) && *entry != '\0')
97 ++entry;
98 cp = entry;
99 while (!isspace (*cp) && *cp != '\0')
100 ++cp;
101 arg1 = cp;
102 ++arg1;
103 *cp = '\0';
104 if (strlen (entry) == 0)
105 error (0, 0, _("Parse error: %s"), line);
106 while (isspace (*arg1) && *arg1 != '\0')
107 ++arg1;
108 cp = arg1;
109 while (!isspace (*cp) && *cp != '\0')
110 ++cp;
111 arg2 = cp;
112 ++arg2;
113 *cp = '\0';
114 if (strlen (arg2) > 0)
115 {
116 while (isspace (*arg2) && *arg2 != '\0')
117 ++arg2;
118 cp = arg2;
119 while (!isspace (*cp) && *cp != '\0')
120 ++cp;
121 *cp = '\0';
122 }
123
124 if (strcmp (entry, "positive-time-to-live") == 0)
125 {
126 int idx = find_db (arg1);
127 if (idx >= 0)
128 dbs[idx].postimeout = atol (arg2);
129 }
130 else if (strcmp (entry, "negative-time-to-live") == 0)
131 {
132 int idx = find_db (arg1);
133 if (idx >= 0)
134 dbs[idx].negtimeout = atol (arg2);
135 }
136 else if (strcmp (entry, "suggested-size") == 0)
137 {
138 int idx = find_db (arg1);
139 if (idx >= 0)
140 dbs[idx].suggested_module
141 = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
142 }
143 else if (strcmp (entry, "enable-cache") == 0)
144 {
145 int idx = find_db (arg1);
146 if (idx >= 0)
147 {
148 if (strcmp (arg2, "no") == 0)
149 dbs[idx].enabled = 0;
150 else if (strcmp (arg2, "yes") == 0)
151 dbs[idx].enabled = 1;
152 }
153 }
154 else if (strcmp (entry, "check-files") == 0)
155 {
156 int idx = find_db (arg1);
157 if (idx >= 0)
158 {
159 if (strcmp (arg2, "no") == 0)
160 dbs[idx].check_file = 0;
161 else if (strcmp (arg2, "yes") == 0)
162 dbs[idx].check_file = 1;
163 }
164 }
165 else if (strcmp (entry, "max-db-size") == 0)
166 {
167 int idx = find_db (arg1);
168 if (idx >= 0)
169 dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
170 }
171 else if (strcmp (entry, "logfile") == 0)
172 set_logfile (arg1);
173 else if (strcmp (entry, "debug-level") == 0)
174 {
175 int level = atoi (arg1);
176 if (level > 0)
177 debug_level = level;
178 }
179 else if (strcmp (entry, "threads") == 0)
180 {
181 if (nthreads == -1)
182 nthreads = MAX (atol (arg1), lastdb);
183 }
184 else if (strcmp (entry, "max-threads") == 0)
185 {
186 max_nthreads = MAX (atol (arg1), lastdb);
187 }
188 else if (strcmp (entry, "server-user") == 0)
189 {
190 if (!arg1)
191 error (0, 0, _("Must specify user name for server-user option"));
192 else
193 {
194 free ((char *) server_user);
195 server_user = xstrdup (arg1);
196 }
197 }
198 else if (strcmp (entry, "stat-user") == 0)
199 {
200 if (arg1 == NULL)
201 error (0, 0, _("Must specify user name for stat-user option"));
202 else
203 {
204 free ((char *) stat_user);
205 stat_user = xstrdup (arg1);
206
207 struct passwd *pw = getpwnam (stat_user);
208 if (pw != NULL)
209 stat_uid = pw->pw_uid;
210 }
211 }
212 else if (strcmp (entry, "persistent") == 0)
213 {
214 int idx = find_db (arg1);
215 if (idx >= 0)
216 {
217 if (strcmp (arg2, "no") == 0)
218 dbs[idx].persistent = 0;
219 else if (strcmp (arg2, "yes") == 0)
220 dbs[idx].persistent = 1;
221 }
222 }
223 else if (strcmp (entry, "shared") == 0)
224 {
225 int idx = find_db (arg1);
226 if (idx >= 0)
227 {
228 if (strcmp (arg2, "no") == 0)
229 dbs[idx].shared = 0;
230 else if (strcmp (arg2, "yes") == 0)
231 dbs[idx].shared = 1;
232 }
233 }
234 else if (strcmp (entry, "reload-count") == 0)
235 {
236 if (strcasecmp (arg1, "unlimited") == 0)
237 reload_count = UINT_MAX;
238 else
239 {
240 unsigned long int count = strtoul (arg1, NULL, 0);
241 if (count > UINT8_MAX - 1)
242 reload_count = UINT_MAX;
243 else
244 reload_count = count;
245 }
246 }
247 else if (strcmp (entry, "paranoia") == 0)
248 {
249 if (strcmp (arg1, "no") == 0)
250 paranoia = 0;
251 else if (strcmp (arg1, "yes") == 0)
252 paranoia = 1;
253 }
254 else if (strcmp (entry, "restart-interval") == 0)
255 {
256 if (arg1 != NULL)
257 restart_interval = atol (arg1);
258 else
259 error (0, 0, _("Must specify value for restart-interval option"));
260 }
261 else if (strcmp (entry, "auto-propagate") == 0)
262 {
263 int idx = find_db (arg1);
264 if (idx >= 0)
265 {
266 if (strcmp (arg2, "no") == 0)
267 dbs[idx].propagate = 0;
268 else if (strcmp (arg2, "yes") == 0)
269 dbs[idx].propagate = 1;
270 }
271 }
272 else
273 error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
274 }
275 while (!feof_unlocked (fp));
276
277 if (paranoia)
278 {
279 restart_time = time (NULL) + restart_interval;
280
281 /* Save the old current workding directory if we are in paranoia
282 mode. We have to change back to it. */
283 oldcwd = get_current_dir_name ();
284 if (oldcwd == NULL)
285 {
286 error (0, 0, _("\
287cannot get current working directory: %s; disabling paranoia mode"),
288 strerror (errno));
289 paranoia = 0;
290 }
291 }
292
293 /* Enforce sanity. */
294 if (max_nthreads < nthreads)
295 max_nthreads = nthreads;
296
297 for (cnt = 0; cnt < lastdb; ++cnt)
298 {
299 size_t datasize = (sizeof (struct database_pers_head)
300 + roundup (dbs[cnt].suggested_module
301 * sizeof (ref_t), ALIGN)
302 + (dbs[cnt].suggested_module
303 * DEFAULT_DATASIZE_PER_BUCKET));
304 if (datasize > dbs[cnt].max_db_size)
305 {
306 error (0, 0, _("maximum file size for %s database too small"),
307 dbnames[cnt]);
308 dbs[cnt].max_db_size = datasize;
309 }
310
311 }
312
313 /* Free the buffer. */
314 free (line);
315 /* Close configuration file. */
316 fclose (fp);
317
318 return error_message_count != initial_error_message_count;
319}
320