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d67281a7 UD |
1 | /* Copyright (c) 1998 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* nscd - Name Service Cache Daemon. Caches passwd and group. */ | |
21 | ||
4d06461a | 22 | #include <argp.h> |
d67281a7 | 23 | #include <errno.h> |
4d06461a | 24 | #include <error.h> |
d67281a7 UD |
25 | #include <libintl.h> |
26 | #include <locale.h> | |
27 | #include <pthread.h> | |
28 | #include <pwd.h> | |
29 | #include <signal.h> | |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <syslog.h> | |
4c223a7c | 34 | #include <unistd.h> |
d67281a7 UD |
35 | #include <sys/socket.h> |
36 | #include <sys/un.h> | |
37 | ||
38 | #include "dbg_log.h" | |
39 | #include "nscd.h" | |
40 | ||
41 | /* Get libc version number. */ | |
42 | #include <version.h> | |
43 | ||
44 | #define PACKAGE _libc_intl_domainname | |
45 | ||
46 | /* Structure used by main() thread to keep track of the number of | |
47 | active threads. Used to limit how many threads it will create | |
48 | and under a shutdown condition to wait till all in-progress | |
49 | requests have finished before "turning off the lights". */ | |
50 | ||
51 | typedef struct | |
52 | { | |
53 | int num_active; | |
54 | pthread_cond_t thread_exit_cv; | |
55 | pthread_mutex_t mutex; | |
56 | } thread_info_t; | |
57 | ||
58 | thread_info_t thread_info; | |
59 | ||
60 | int do_shutdown = 0; | |
61 | int disabled_passwd = 0; | |
62 | int disabled_group = 0; | |
4d06461a UD |
63 | int go_background = 1; |
64 | const char *conffile = _PATH_NSCDCONF; | |
d67281a7 UD |
65 | |
66 | static void termination_handler (int signum); | |
67 | static int check_pid (const char *file); | |
68 | static int write_pid (const char *file); | |
d67281a7 UD |
69 | static void handle_requests (void); |
70 | ||
4d06461a UD |
71 | /* Name and version of program. */ |
72 | static void print_version (FILE *stream, struct argp_state *state); | |
73 | void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; | |
74 | ||
75 | /* Definitions of arguments for argp functions. */ | |
76 | static const struct argp_option options[] = | |
77 | { | |
78 | { "config-file", 'f', N_("NAME"), 0, | |
79 | N_("Read configuration data from NAME") }, | |
80 | { "debug", 'd', NULL, 0, | |
81 | N_("Do not fork and display messages on the current tty") }, | |
82 | { "shutdown", 'K', NULL, 0, N_("Shut the server down") }, | |
3dd90163 | 83 | { "statistic", 'g', NULL, 0, N_("Print current configuration statistic") }, |
4d06461a UD |
84 | { NULL, 0, NULL, 0, NULL } |
85 | }; | |
86 | ||
87 | /* Short description of program. */ | |
88 | static const char doc[] = N_("Name Switch Cache Daemon."); | |
89 | ||
90 | /* Prototype for option handler. */ | |
91 | static error_t parse_opt __P ((int key, char *arg, struct argp_state *state)); | |
92 | ||
93 | /* Data structure to communicate with argp functions. */ | |
94 | static struct argp argp = | |
95 | { | |
96 | options, parse_opt, NULL, doc, | |
97 | }; | |
98 | ||
d67281a7 UD |
99 | int |
100 | main (int argc, char **argv) | |
101 | { | |
4d06461a | 102 | int remaining; |
d67281a7 UD |
103 | |
104 | /* Set locale via LC_ALL. */ | |
105 | setlocale (LC_ALL, ""); | |
106 | /* Set the text message domain. */ | |
107 | textdomain (PACKAGE); | |
108 | ||
4d06461a UD |
109 | /* Parse and process arguments. */ |
110 | argp_parse (&argp, argc, argv, 0, &remaining, NULL); | |
111 | ||
14e9dd67 | 112 | if (remaining != argc) |
d67281a7 | 113 | { |
4d06461a UD |
114 | error (0, 0, gettext ("wrong number of arguments")); |
115 | argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name); | |
116 | exit (EXIT_FAILURE); | |
d67281a7 UD |
117 | } |
118 | ||
119 | signal (SIGINT, termination_handler); | |
120 | signal (SIGQUIT, termination_handler); | |
121 | signal (SIGTERM, termination_handler); | |
eb13b9a0 | 122 | signal (SIGPIPE, SIG_IGN); |
d67281a7 UD |
123 | |
124 | /* Check if we are already running. */ | |
125 | if (check_pid (_PATH_NSCDPID)) | |
126 | { | |
127 | fputs (_("already running"), stderr); | |
128 | exit (EXIT_FAILURE); | |
129 | } | |
130 | ||
131 | /* Behave like a daemon. */ | |
132 | if (go_background) | |
133 | { | |
134 | openlog ("nscd", LOG_CONS | LOG_ODELAY, LOG_DAEMON); | |
135 | ||
136 | if (daemon (0, 0) < 0) | |
137 | { | |
138 | fprintf (stderr, _("connot auto-background: %s\n"), | |
139 | strerror (errno)); | |
140 | exit (EXIT_FAILURE); | |
141 | } | |
142 | if (write_pid (_PATH_NSCDPID) < 0) | |
143 | dbg_log ("%s: %s", _PATH_NSCDPID, strerror (errno)); | |
144 | ||
145 | /* Ignore job control signals */ | |
146 | signal (SIGTTOU, SIG_IGN); | |
147 | signal (SIGTTIN, SIG_IGN); | |
148 | signal (SIGTSTP, SIG_IGN); | |
149 | } | |
150 | /* Cleanup files created by a previous `bind' */ | |
151 | unlink (_PATH_NSCDSOCKET); | |
152 | ||
153 | nscd_parse_file (conffile); | |
154 | ||
155 | /* Create first sockets */ | |
156 | init_sockets (); | |
157 | /* Init databases */ | |
14e9dd67 UD |
158 | if ((cache_pwdinit () < 0) || (cache_grpinit () < 0)) |
159 | { | |
160 | fputs (_("Not enough memory\n"), stderr); | |
161 | return 1; | |
162 | } | |
d67281a7 UD |
163 | /* Handle incoming requests */ |
164 | handle_requests (); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
4d06461a UD |
169 | |
170 | /* Handle program arguments. */ | |
171 | static error_t | |
172 | parse_opt (int key, char *arg, struct argp_state *state) | |
173 | { | |
174 | switch (key) | |
175 | { | |
176 | case 'd': | |
177 | debug_flag = 1; | |
178 | go_background = 0; | |
179 | break; | |
180 | case 'f': | |
181 | conffile = arg; | |
182 | break; | |
183 | case 'K': | |
184 | if (getuid () != 0) | |
185 | { | |
186 | printf (_("Only root is allowed to use this option!\n\n")); | |
187 | exit (EXIT_FAILURE); | |
188 | } | |
189 | { | |
190 | int sock = __nscd_open_socket (); | |
191 | request_header req; | |
192 | ssize_t nbytes; | |
193 | ||
194 | if (sock == -1) | |
195 | exit (EXIT_FAILURE); | |
196 | ||
197 | req.version = NSCD_VERSION; | |
198 | req.type = SHUTDOWN; | |
199 | req.key_len = 0; | |
200 | nbytes = write (sock, &req, sizeof (request_header)); | |
201 | close (sock); | |
202 | if (nbytes != req.key_len) | |
203 | exit (EXIT_FAILURE); | |
204 | else | |
205 | exit (EXIT_SUCCESS); | |
206 | } | |
207 | case 'g': | |
208 | print_stat (); | |
209 | exit (EXIT_SUCCESS); | |
210 | default: | |
211 | return ARGP_ERR_UNKNOWN; | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* Print the version information. */ | |
217 | static void | |
218 | print_version (FILE *stream, struct argp_state *state) | |
219 | { | |
220 | fprintf (stream, "nscd (GNU %s) %s\n", PACKAGE, VERSION); | |
221 | fprintf (stream, gettext ("\ | |
222 | Copyright (C) %s Free Software Foundation, Inc.\n\ | |
223 | This is free software; see the source for copying conditions. There is NO\n\ | |
224 | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ | |
225 | "), "1998"); | |
226 | fprintf (stream, gettext ("Written by %s.\n"), "Thorsten Kukuk"); | |
227 | } | |
228 | ||
229 | ||
d67281a7 UD |
230 | /* Create a socket connected to a name. */ |
231 | int | |
232 | __nscd_open_socket (void) | |
233 | { | |
234 | struct sockaddr_un addr; | |
235 | int sock; | |
236 | ||
237 | sock = socket (PF_UNIX, SOCK_STREAM, 0); | |
238 | if (sock < 0) | |
239 | return -1; | |
240 | ||
241 | addr.sun_family = AF_UNIX; | |
242 | strcpy (addr.sun_path, _PATH_NSCDSOCKET); | |
243 | if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0) | |
244 | { | |
245 | close (sock); | |
246 | return -1; | |
247 | } | |
248 | ||
249 | return sock; | |
250 | } | |
251 | ||
252 | /* Cleanup. */ | |
253 | static void | |
254 | termination_handler (int signum) | |
255 | { | |
256 | close_sockets (); | |
257 | ||
258 | /* Clean up the files created by `bind'. */ | |
259 | unlink (_PATH_NSCDSOCKET); | |
260 | ||
261 | /* Clean up pid file. */ | |
262 | unlink (_PATH_NSCDPID); | |
263 | ||
264 | exit (EXIT_SUCCESS); | |
265 | } | |
266 | ||
d67281a7 UD |
267 | /* Returns 1 if the process in pid file FILE is running, 0 if not. */ |
268 | static int | |
269 | check_pid (const char *file) | |
270 | { | |
271 | FILE *fp; | |
272 | ||
273 | fp = fopen (file, "r"); | |
274 | if (fp) | |
275 | { | |
276 | pid_t pid; | |
277 | ||
278 | fscanf (fp, "%d", &pid); | |
279 | fclose (fp); | |
280 | ||
281 | if (kill (pid, 0) == 0) | |
282 | return 1; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | /* Write the current process id to the file FILE. | |
289 | Returns 0 if successful, -1 if not. */ | |
290 | static int | |
291 | write_pid (const char *file) | |
292 | { | |
293 | FILE *fp; | |
294 | ||
295 | fp = fopen (file, "w"); | |
296 | if (fp == NULL) | |
297 | return -1; | |
298 | ||
299 | fprintf (fp, "%d\n", getpid ()); | |
300 | if (ferror (fp)) | |
301 | return -1; | |
302 | ||
303 | fclose (fp); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* Type of the lookup function for netname2user. */ | |
309 | typedef int (*pwbyname_function) (const char *name, struct passwd *pw, | |
310 | char *buffer, size_t buflen); | |
311 | ||
ba9234d9 | 312 | /* Handle incoming requests. */ |
d67281a7 UD |
313 | static |
314 | void handle_requests (void) | |
315 | { | |
316 | request_header req; | |
317 | int conn; /* Handle on which connection (client) the request came from. */ | |
318 | int done = 0; | |
319 | char *key; | |
ba9234d9 UD |
320 | pthread_attr_t th_attr; |
321 | ||
322 | /* We will create all threads detached. Therefore prepare an attribute | |
323 | now. */ | |
324 | pthread_attr_init (&th_attr); | |
325 | pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED); | |
d67281a7 UD |
326 | |
327 | while (!done) | |
328 | { | |
329 | key = NULL; | |
330 | get_request (&conn, &req, &key); | |
331 | if (debug_flag) | |
332 | dbg_log (_("handle_requests: request received (Version = %d)"), | |
333 | req.version); | |
334 | switch (req.type) | |
335 | { | |
336 | case GETPWBYNAME: | |
337 | { | |
338 | param_t *param = malloc (sizeof (param_t)); | |
339 | pthread_t thread; | |
ba9234d9 | 340 | int status; |
d67281a7 UD |
341 | |
342 | if (debug_flag) | |
343 | dbg_log ("\tGETPWBYNAME (%s)", key); | |
344 | param->key = key; | |
345 | param->conn = conn; | |
346 | if (disabled_passwd) | |
ba9234d9 UD |
347 | status = pthread_create (&thread, &th_attr, cache_pw_disabled, |
348 | (void *)param); | |
d67281a7 | 349 | else |
ba9234d9 UD |
350 | status = pthread_create (&thread, &th_attr, cache_getpwnam, |
351 | (void *)param); | |
352 | if (status != 0) | |
353 | { | |
354 | dbg_log (_("Creation of thread failed: %s"), strerror (errno)); | |
355 | close_socket (conn); | |
356 | } | |
d67281a7 UD |
357 | pthread_detach (thread); |
358 | } | |
359 | break; | |
360 | case GETPWBYUID: | |
361 | { | |
362 | param_t *param = malloc (sizeof (param_t)); | |
363 | pthread_t thread; | |
ba9234d9 | 364 | int status; |
d67281a7 UD |
365 | |
366 | if (debug_flag) | |
367 | dbg_log ("\tGETPWBYUID (%s)", key); | |
368 | param->key = key; | |
369 | param->conn = conn; | |
370 | if (disabled_passwd) | |
ba9234d9 UD |
371 | status = pthread_create (&thread, &th_attr, cache_pw_disabled, |
372 | (void *)param); | |
d67281a7 | 373 | else |
ba9234d9 UD |
374 | status = pthread_create (&thread, &th_attr, cache_getpwuid, |
375 | (void *)param); | |
376 | if (status != 0) | |
377 | { | |
378 | dbg_log (_("Creation of thread failed: %s"), strerror (errno)); | |
379 | close_socket (conn); | |
380 | } | |
d67281a7 UD |
381 | } |
382 | break; | |
383 | case GETGRBYNAME: | |
384 | { | |
385 | param_t *param = malloc (sizeof (param_t)); | |
386 | pthread_t thread; | |
ba9234d9 | 387 | int status; |
d67281a7 UD |
388 | |
389 | if (debug_flag) | |
390 | dbg_log ("\tGETGRBYNAME (%s)", key); | |
391 | param->key = key; | |
392 | param->conn = conn; | |
393 | if (disabled_group) | |
ba9234d9 UD |
394 | status = pthread_create (&thread, &th_attr, cache_gr_disabled, |
395 | (void *)param); | |
d67281a7 | 396 | else |
ba9234d9 UD |
397 | status = pthread_create (&thread, &th_attr, cache_getgrnam, |
398 | (void *)param); | |
399 | if (status != 0) | |
400 | { | |
401 | dbg_log (_("Creation of thread failed: %s"), strerror (errno)); | |
402 | close_socket (conn); | |
403 | } | |
d67281a7 UD |
404 | } |
405 | break; | |
406 | case GETGRBYGID: | |
407 | { | |
408 | param_t *param = malloc (sizeof (param_t)); | |
409 | pthread_t thread; | |
ba9234d9 | 410 | int status; |
d67281a7 UD |
411 | |
412 | if (debug_flag) | |
413 | dbg_log ("\tGETGRBYGID (%s)", key); | |
414 | param->key = key; | |
415 | param->conn = conn; | |
416 | if (disabled_group) | |
ba9234d9 UD |
417 | status = pthread_create (&thread, &th_attr, cache_gr_disabled, |
418 | (void *)param); | |
d67281a7 | 419 | else |
ba9234d9 UD |
420 | status = pthread_create (&thread, &th_attr, cache_getgrgid, |
421 | (void *)param); | |
422 | if (status != 0) | |
423 | { | |
424 | dbg_log (_("Creation of thread failed: %s"), strerror (errno)); | |
425 | close_socket (conn); | |
426 | } | |
d67281a7 UD |
427 | } |
428 | break; | |
429 | case GETHOSTBYNAME: | |
430 | /* Not yetimplemented. */ | |
431 | close_socket (conn); | |
432 | break; | |
433 | case GETHOSTBYADDR: | |
434 | /* Not yet implemented. */ | |
435 | close_socket (conn); | |
436 | break; | |
437 | case SHUTDOWN: | |
438 | do_shutdown = 1; | |
439 | close_socket (0); | |
440 | close_socket (conn); | |
441 | /* Clean up the files created by `bind'. */ | |
442 | unlink (_PATH_NSCDSOCKET); | |
443 | /* Clean up pid file. */ | |
444 | unlink (_PATH_NSCDPID); | |
445 | done = 1; | |
446 | break; | |
447 | case GETSTAT: | |
448 | { | |
449 | stat_response_header resp; | |
450 | ||
451 | if (debug_flag) | |
452 | dbg_log ("\tGETSTAT"); | |
453 | ||
454 | get_pw_stat (&resp); | |
455 | get_gr_stat (&resp); | |
456 | resp.debug_level = debug_flag; | |
457 | resp.pw_enabled = !disabled_passwd; | |
458 | resp.gr_enabled = !disabled_group; | |
459 | ||
460 | stat_send (conn, &resp); | |
461 | ||
462 | close_socket (conn); | |
463 | } | |
464 | break; | |
465 | default: | |
466 | dbg_log (_("Unknown request (%d)"), req.type); | |
467 | break; | |
468 | } | |
469 | } | |
ba9234d9 UD |
470 | |
471 | pthread_attr_destroy (&th_attr); | |
d67281a7 | 472 | } |