1 /* Copyright (c) 1998-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published
6 by the Free Software Foundation; version 2 of the License, or
7 (at your option) any later version.
8
9 This program 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
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
16
17 #include <ctype.h>
18 #include <errno.h>
19 #include <error.h>
20 #include <libintl.h>
21 #include <malloc.h>
22 #include <pwd.h>
23 #include <stdio.h>
24 #include <stdio_ext.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <sys/param.h>
29 #include <sys/types.h>
30
31 #include "dbg_log.h"
32 #include "nscd.h"
33
34
35 /* Names of the databases. */
36 const char *const dbnames[lastdb] =
37 {
38 [pwddb] = "passwd",
39 [grpdb] = "group",
40 [hstdb] = "hosts",
41 [servdb] = "services",
42 [netgrdb] = "netgroup"
43 };
44
45
46 static int
47 find_db (const char *name)
48 {
49 for (int cnt = 0; cnt < lastdb; ++cnt)
50 if (strcmp (name, dbnames[cnt]) == 0)
51 return cnt;
52
53 error (0, 0, _("database %s is not supported"), name);
54 return -1;
55 }
56
57 int
58 nscd_parse_file (const char *fname, struct database_dyn dbs[lastdb])
59 {
60 FILE *fp;
61 char *line, *cp, *entry, *arg1, *arg2;
62 size_t len;
63 int cnt;
64 const unsigned int initial_error_message_count = error_message_count;
65
66 /* Open the configuration file. */
67 fp = fopen (fname, "r");
68 if (fp == NULL)
69 return -1;
70
71 /* The stream is not used by more than one thread. */
72 (void) __fsetlocking (fp, FSETLOCKING_BYCALLER);
73
74 line = NULL;
75 len = 0;
76
77 do
78 {
79 ssize_t n = getline (&line, &len, fp);
80 if (n < 0)
81 break;
82 if (line[n - 1] == '\n')
83 line[n - 1] = '\0';
84
85 /* Because the file format does not know any form of quoting we
86 can search forward for the next '#' character and if found
87 make it terminating the line. */
88 *strchrnul (line, '#') = '\0';
89
90 /* If the line is blank it is ignored. */
91 if (line[0] == '\0')
92 continue;
93
94 entry = line;
95 while (isspace (*entry) && *entry != '\0')
96 ++entry;
97 cp = entry;
98 while (!isspace (*cp) && *cp != '\0')
99 ++cp;
100 arg1 = cp;
101 ++arg1;
102 *cp = '\0';
103 if (strlen (entry) == 0)
104 error (0, 0, _("Parse error: %s"), line);
105 while (isspace (*arg1) && *arg1 != '\0')
106 ++arg1;
107 cp = arg1;
108 while (!isspace (*cp) && *cp != '\0')
109 ++cp;
110 arg2 = cp;
111 ++arg2;
112 *cp = '\0';
113 if (strlen (arg2) > 0)
114 {
115 while (isspace (*arg2) && *arg2 != '\0')
116 ++arg2;
117 cp = arg2;
118 while (!isspace (*cp) && *cp != '\0')
119 ++cp;
120 *cp = '\0';
121 }
122
123 if (strcmp (entry, "positive-time-to-live") == 0)
124 {
125 int idx = find_db (arg1);
126 if (idx >= 0)
127 dbs[idx].postimeout = atol (arg2);
128 }
129 else if (strcmp (entry, "negative-time-to-live") == 0)
130 {
131 int idx = find_db (arg1);
132 if (idx >= 0)
133 dbs[idx].negtimeout = atol (arg2);
134 }
135 else if (strcmp (entry, "suggested-size") == 0)
136 {
137 int idx = find_db (arg1);
138 if (idx >= 0)
139 dbs[idx].suggested_module
140 = atol (arg2) ?: DEFAULT_SUGGESTED_MODULE;
141 }
142 else if (strcmp (entry, "enable-cache") == 0)
143 {
144 int idx = find_db (arg1);
145 if (idx >= 0)
146 {
147 if (strcmp (arg2, "no") == 0)
148 dbs[idx].enabled = 0;
149 else if (strcmp (arg2, "yes") == 0)
150 dbs[idx].enabled = 1;
151 }
152 }
153 else if (strcmp (entry, "check-files") == 0)
154 {
155 int idx = find_db (arg1);
156 if (idx >= 0)
157 {
158 if (strcmp (arg2, "no") == 0)
159 dbs[idx].check_file = 0;
160 else if (strcmp (arg2, "yes") == 0)
161 dbs[idx].check_file = 1;
162 }
163 }
164 else if (strcmp (entry, "max-db-size") == 0)
165 {
166 int idx = find_db (arg1);
167 if (idx >= 0)
168 dbs[idx].max_db_size = atol (arg2) ?: DEFAULT_MAX_DB_SIZE;
169 }
170 else if (strcmp (entry, "logfile") == 0)
171 set_logfile (arg1);
172 else if (strcmp (entry, "debug-level") == 0)
173 {
174 int level = atoi (arg1);
175 if (level > 0)
176 debug_level = level;
177 }
178 else if (strcmp (entry, "threads") == 0)
179 {
180 if (nthreads == -1)
181 nthreads = MAX (atol (arg1), lastdb);
182 }
183 else if (strcmp (entry, "max-threads") == 0)
184 {
185 max_nthreads = MAX (atol (arg1), lastdb);
186 }
187 else if (strcmp (entry, "server-user") == 0)
188 {
189 if (!arg1)
190 error (0, 0, _("Must specify user name for server-user option"));
191 else
192 {
193 free ((char *) server_user);
194 server_user = xstrdup (arg1);
195 }
196 }
197 else if (strcmp (entry, "stat-user") == 0)
198 {
199 if (arg1 == NULL)
200 error (0, 0, _("Must specify user name for stat-user option"));
201 else
202 {
203 free ((char *) stat_user);
204 stat_user = xstrdup (arg1);
205
206 struct passwd *pw = getpwnam (stat_user);
207 if (pw != NULL)
208 stat_uid = pw->pw_uid;
209 }
210 }
211 else if (strcmp (entry, "persistent") == 0)
212 {
213 int idx = find_db (arg1);
214 if (idx >= 0)
215 {
216 if (strcmp (arg2, "no") == 0)
217 dbs[idx].persistent = 0;
218 else if (strcmp (arg2, "yes") == 0)
219 dbs[idx].persistent = 1;
220 }
221 }
222 else if (strcmp (entry, "shared") == 0)
223 {
224 int idx = find_db (arg1);
225 if (idx >= 0)
226 {
227 if (strcmp (arg2, "no") == 0)
228 dbs[idx].shared = 0;
229 else if (strcmp (arg2, "yes") == 0)
230 dbs[idx].shared = 1;
231 }
232 }
233 else if (strcmp (entry, "reload-count") == 0)
234 {
235 if (strcasecmp (arg1, "unlimited") == 0)
236 reload_count = UINT_MAX;
237 else
238 {
239 unsigned long int count = strtoul (arg1, NULL, 0);
240 if (count > UINT8_MAX - 1)
241 reload_count = UINT_MAX;
242 else
243 reload_count = count;
244 }
245 }
246 else if (strcmp (entry, "paranoia") == 0)
247 {
248 if (strcmp (arg1, "no") == 0)
249 paranoia = 0;
250 else if (strcmp (arg1, "yes") == 0)
251 paranoia = 1;
252 }
253 else if (strcmp (entry, "restart-interval") == 0)
254 {
255 if (arg1 != NULL)
256 restart_interval = atol (arg1);
257 else
258 error (0, 0, _("Must specify value for restart-interval option"));
259 }
260 else if (strcmp (entry, "auto-propagate") == 0)
261 {
262 int idx = find_db (arg1);
263 if (idx >= 0)
264 {
265 if (strcmp (arg2, "no") == 0)
266 dbs[idx].propagate = 0;
267 else if (strcmp (arg2, "yes") == 0)
268 dbs[idx].propagate = 1;
269 }
270 }
271 else
272 error (0, 0, _("Unknown option: %s %s %s"), entry, arg1, arg2);
273 }
274 while (!feof_unlocked (fp));
275
276 if (paranoia)
277 {
278 restart_time = time (NULL) + restart_interval;
279
280 /* Save the old current workding directory if we are in paranoia
281 mode. We have to change back to it. */
282 oldcwd = get_current_dir_name ();
283 if (oldcwd == NULL)
284 {
285 error (0, 0, _("\
286 cannot get current working directory: %s; disabling paranoia mode"),
287 strerror (errno));
288 paranoia = 0;
289 }
290 }
291
292 /* Enforce sanity. */
293 if (max_nthreads < nthreads)
294 max_nthreads = nthreads;
295
296 for (cnt = 0; cnt < lastdb; ++cnt)
297 {
298 size_t datasize = (sizeof (struct database_pers_head)
299 + roundup (dbs[cnt].suggested_module
300 * sizeof (ref_t), ALIGN)
301 + (dbs[cnt].suggested_module
302 * DEFAULT_DATASIZE_PER_BUCKET));
303 if (datasize > dbs[cnt].max_db_size)
304 {
305 error (0, 0, _("maximum file size for %s database too small"),
306 dbnames[cnt]);
307 dbs[cnt].max_db_size = datasize;
308 }
309
310 }
311
312 /* Free the buffer. */
313 free (line);
314 /* Close configuration file. */
315 fclose (fp);
316
317 return error_message_count != initial_error_message_count;
318 }