Remove some system errors from errno.h
[paraslash.git] / afs.c
1 /*
2 * Copyright (C) 2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file afs.c Paraslash's audio file selector. */
8
9 #include <signal.h>
10 #include <fnmatch.h>
11 #include "server.cmdline.h"
12 #include "para.h"
13 #include "afh.h"
14 #include "server.h"
15 #include "error.h"
16 #include <dirent.h> /* readdir() */
17 #include <sys/mman.h>
18 #include <sys/time.h>
19 #include "net.h"
20 #include "afs.h"
21 #include "ipc.h"
22 #include "string.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "signal.h"
26 #include "fd.h"
27
28 /** The osl tables used by afs. \sa blob.c. */
29 enum afs_table_num {
30 /** Contains audio file information. See aft.c. */
31 TBLNUM_AUDIO_FILES,
32 /** The table for the paraslash attributes. See attribute.c. */
33 TBLNUM_ATTRIBUTES,
34 /**
35 * Paraslash's scoring system is based on Gaussian normal
36 * distributions, and the relevant data is stored in the rbtrees of an
37 * osl table containing only volatile columns. See score.c for
38 * details.
39 */
40 TBLNUM_SCORES,
41 /**
42 * A standard blob table containing the mood definitions. For details
43 * see mood.c.
44 */
45 TBLNUM_MOODS,
46 /** A blob table containing lyrics on a per-song basis. */
47 TBLNUM_LYRICS,
48 /** Another blob table for images (for example album cover art). */
49 TBLNUM_IMAGES,
50 /** Yet another blob table for storing standard playlists. */
51 TBLNUM_PLAYLIST,
52 /** How many tables are in use? */
53 NUM_AFS_TABLES
54 };
55
56 static struct table_info afs_tables[NUM_AFS_TABLES];
57
58 struct command_task {
59 /** The file descriptor for the local socket. */
60 int fd;
61 /**
62 * Value sent by the command handlers to identify themselves as
63 * children of the running para_server.
64 */
65 uint32_t cookie;
66 /** The associated task structure. */
67 struct task task;
68 };
69
70 /**
71 * A random number used to "authenticate" the connection.
72 *
73 * para_server picks this number by random before forking the afs process. The
74 * command handlers write this number together with the id of the shared memory
75 * area containing the query. This way, a malicious local user has to know this
76 * number to be able to cause the afs process to crash by sending fake queries.
77 */
78 extern uint32_t afs_socket_cookie;
79
80 /**
81 * Struct to let command handlers execute a callback in afs context.
82 *
83 * Commands that need to change the state of afs can't change the relevant data
84 * structures directly because commands are executed in a child process, i.e.
85 * they get their own virtual address space.
86 *
87 * This structure is used by \p send_callback_request() (executed from handler
88 * context) in order to let the afs process call the specified function. An
89 * instance of that structure is written to a shared memory area together with
90 * the arguments to the callback function. The identifier of the shared memory
91 * area is written to the command socket.
92 *
93 * The afs process accepts connections on the command socket and reads the
94 * shared memory id, attaches the corresponing area, calls the given handler to
95 * perform the desired action and to optionally compute a result.
96 *
97 * The result and a \p callback_result structure is then written to another
98 * shared memory area. The identifier for that area is written to the handler's
99 * command socket, so that the handler process can read the id, attach the
100 * shared memory area and use the result.
101 *
102 * \sa struct callback_result.
103 */
104 struct callback_query {
105 /** The function to be called. */
106 callback_function *handler;
107 /** The number of bytes of the query */
108 size_t query_size;
109 };
110
111 /**
112 * Structure embedded in the result of a callback.
113 *
114 * If the callback produced a result, an instance of that structure is embeeded
115 * into the shared memory area holding the result, mainly to let the command
116 * handler know the size of the result.
117 *
118 * \sa struct callback_query.
119 */
120 struct callback_result {
121 /** The number of bytes of the result. */
122 size_t result_size;
123 };
124
125 /**
126 * Ask the afs process to call a given function.
127 *
128 * \param f The function to be called.
129 * \param query Pointer to arbitrary data for the callback.
130 * \param result Callback result will be stored here.
131 *
132 * This function creates a shared memory area, copies the buffer pointed to by
133 * \a buf to that area and notifies the afs process that \a f should be
134 * called ASAP.
135 *
136 * \return Negative, on errors, the return value of the callback function
137 * otherwise.
138 *
139 * \sa send_option_arg_callback_request(), send_standard_callback_request().
140 */
141 int send_callback_request(callback_function *f, struct osl_object *query,
142 struct osl_object *result)
143 {
144 struct callback_query *cq;
145 struct callback_result *cr;
146 int ret, fd = -1, query_shmid, result_shmid;
147 void *query_shm, *result_shm;
148 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
149 struct sockaddr_un unix_addr;
150 size_t query_shm_size = sizeof(*cq);
151
152 if (query)
153 query_shm_size += query->size;
154 ret = shm_new(query_shm_size);
155 if (ret < 0)
156 return ret;
157 query_shmid = ret;
158 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
159 if (ret < 0)
160 goto out;
161 cq = query_shm;
162 cq->handler = f;
163 cq->query_size = query_shm_size - sizeof(*cq);
164
165 if (query)
166 memcpy(query_shm + sizeof(*cq), query->data, query->size);
167 ret = shm_detach(query_shm);
168 if (ret < 0)
169 goto out;
170
171 *(uint32_t *) buf = afs_socket_cookie;
172 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
173
174 ret = get_stream_socket(PF_UNIX);
175 if (ret < 0)
176 goto out;
177 fd = ret;
178 ret = init_unix_addr(&unix_addr, conf.afs_socket_arg);
179 if (ret < 0)
180 goto out;
181 ret = PARA_CONNECT(fd, &unix_addr);
182 if (ret < 0)
183 goto out;
184 ret = send_bin_buffer(fd, buf, sizeof(buf));
185 if (ret < 0)
186 goto out;
187 ret = recv_bin_buffer(fd, buf, sizeof(buf));
188 if (ret < 0)
189 goto out;
190 if (ret != sizeof(int)) {
191 ret = -E_RECV;
192 goto out;
193 }
194 ret = *(int *) buf;
195 if (ret <= 0)
196 goto out;
197 result_shmid = ret;
198 ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
199 if (ret >= 0) {
200 assert(result);
201 cr = result_shm;
202 result->size = cr->result_size;
203 result->data = para_malloc(result->size);
204 memcpy(result->data, result_shm + sizeof(*cr), result->size);
205 ret = shm_detach(result_shm);
206 if (ret < 0)
207 PARA_ERROR_LOG("can not detach result\n");
208 } else
209 PARA_ERROR_LOG("attach result failed: %d\n", ret);
210 if (shm_destroy(result_shmid) < 0)
211 PARA_ERROR_LOG("destroy result failed\n");
212 ret = 1;
213 out:
214 if (shm_destroy(query_shmid) < 0)
215 PARA_ERROR_LOG("%s\n", "shm destroy error");
216 if (fd >= 0)
217 close(fd);
218 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
219 return ret;
220 }
221
222 /**
223 * Send a callback request passing an options structure and an argument vector.
224 *
225 * \param options pointer to an arbitrary data structure.
226 * \param argc Argument count.
227 * \param argv Standard argument vector.
228 * \param f The callback function.
229 * \param result The result of the query is stored here.
230 *
231 * Some commands have a couple of options that are parsed in child context for
232 * syntactic correctness and are stored in a special options structure for that
233 * command. This function allows to pass such a structure together with a list
234 * of further arguments (often a list of audio files) to the parent process.
235 *
236 * \sa send_standard_callback_request(), send_callback_request().
237 */
238 int send_option_arg_callback_request(struct osl_object *options,
239 int argc, char * const * const argv, callback_function *f,
240 struct osl_object *result)
241 {
242 char *p;
243 int i, ret;
244 struct osl_object query = {.size = options? options->size : 0};
245
246 for (i = 0; i < argc; i++)
247 query.size += strlen(argv[i]) + 1;
248 query.data = para_malloc(query.size);
249 p = query.data;
250 if (options) {
251 memcpy(query.data, options->data, options->size);
252 p += options->size;
253 }
254 for (i = 0; i < argc; i++) {
255 strcpy(p, argv[i]); /* OK */
256 p += strlen(argv[i]) + 1;
257 }
258 ret = send_callback_request(f, &query, result);
259 free(query.data);
260 return ret;
261 }
262
263 /**
264 * Send a callback request with an argument vector only.
265 *
266 * \param argc The same meaning as in send_option_arg_callback_request().
267 * \param argv The same meaning as in send_option_arg_callback_request().
268 * \param f The same meaning as in send_option_arg_callback_request().
269 * \param result The same meaning as in send_option_arg_callback_request().
270 *
271 * This is similar to send_option_arg_callback_request(), but no options buffer
272 * is passed to the parent process.
273 *
274 * \return The return value of the underlying call to
275 * send_option_arg_callback_request().
276 */
277 int send_standard_callback_request(int argc, char * const * const argv,
278 callback_function *f, struct osl_object *result)
279 {
280 return send_option_arg_callback_request(NULL, argc, argv, f, result);
281 }
282
283 static int action_if_pattern_matches(struct osl_row *row, void *data)
284 {
285 struct pattern_match_data *pmd = data;
286 struct osl_object name_obj;
287 const char *p, *name;
288 int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
289 const char *pattern_txt = (const char *)pmd->patterns.data;
290
291 if (ret < 0)
292 return ret;
293 name = (char *)name_obj.data;
294 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
295 return 1;
296 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
297 return pmd->action(pmd->table, row, name, pmd->data);
298 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
299 p += strlen(p) + 1) {
300 ret = fnmatch(p, name, pmd->fnmatch_flags);
301 if (ret == FNM_NOMATCH)
302 continue;
303 if (ret)
304 return -E_FNMATCH;
305 return pmd->action(pmd->table, row, name, pmd->data);
306 }
307 return 1;
308 }
309
310 /**
311 * Execute the given function for each matching row.
312 *
313 * \param pmd Describes what to match and how.
314 *
315 * \return The return value of the underlying call to osl_rbtree_loop()
316 * or osl_rbtree_loop_reverse().
317 */
318 int for_each_matching_row(struct pattern_match_data *pmd)
319 {
320 if (pmd->pm_flags & PM_REVERSE_LOOP)
321 return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
322 action_if_pattern_matches);
323 return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
324 action_if_pattern_matches);
325 }
326
327 /**
328 * Compare two osl objects of string type.
329 *
330 * \param obj1 Pointer to the first object.
331 * \param obj2 Pointer to the second object.
332 *
333 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
334 * are taken into account.
335 *
336 * \return It returns an integer less than, equal to, or greater than zero if
337 * \a obj1 is found, respectively, to be less than, to match, or be greater than
338 * obj2.
339 *
340 * \sa strcmp(3), strncmp(3), osl_compare_func.
341 */
342 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
343 {
344 const char *str1 = (const char *)obj1->data;
345 const char *str2 = (const char *)obj2->data;
346 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
347 }
348
349 /*
350 * write input from fd to dynamically allocated buffer,
351 * but maximal max_size byte.
352 */
353 static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
354 {
355 const size_t chunk_size = 1024;
356 size_t size = 2048, received = 0;
357 int ret;
358 char *buf = para_malloc(size);
359
360 for (;;) {
361 ret = recv_bin_buffer(fd, buf + received, chunk_size);
362 if (ret <= 0)
363 break;
364 received += ret;
365 if (received + chunk_size >= size) {
366 size *= 2;
367 ret = -E_INPUT_TOO_LARGE;
368 if (size > max_size)
369 break;
370 buf = para_realloc(buf, size);
371 }
372 }
373 obj->data = buf;
374 obj->size = received;
375 if (ret < 0)
376 free(buf);
377 return ret;
378 }
379
380 /**
381 * Read data from a file descriptor, and send it to the afs process.
382 *
383 * \param fd File descriptor to read data from.
384 * \param arg_obj Pointer to the arguments to \a f.
385 * \param f The callback function.
386 * \param max_len Don't read more than that many bytes from stdin.
387 * \param result The result of the query is stored here.
388 *
389 * This function is used by commands that wish to let para_server store
390 * arbitrary data specified by the user (for instance the add_blob family of
391 * commands). First, at most \a max_len bytes are read from \a fd, the result
392 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
393 * is made available to the parent process via shared memory.
394 *
395 * \return Negative on errors, the return value of the underlying call to
396 * send_callback_request() otherwise.
397 */
398 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
399 unsigned max_len, struct osl_object *result)
400 {
401 struct osl_object query, stdin_obj;
402 int ret;
403
404 ret = send_buffer(fd, AWAITING_DATA_MSG);
405 if (ret < 0)
406 return ret;
407 ret = fd2buf(fd, max_len, &stdin_obj);
408 if (ret < 0)
409 return ret;
410 query.size = arg_obj->size + stdin_obj.size;
411 query.data = para_malloc(query.size);
412 memcpy(query.data, arg_obj->data, arg_obj->size);
413 memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
414 free(stdin_obj.data);
415 ret = send_callback_request(f, &query, result);
416 free(query.data);
417 return ret;
418 }
419
420 /**
421 * Open the audio file with highest score.
422 *
423 * \param afd Audio file data is returned here.
424 *
425 * This stores all information for streaming the "best" audio file
426 * in the \a afd structure.
427 *
428 * \return Positive on success, negative on errors.
429 *
430 * \sa close_audio_file(), open_and_update_audio_file().
431 */
432 int open_next_audio_file(struct audio_file_data *afd)
433 {
434 struct osl_row *aft_row;
435 int ret;
436 for (;;) {
437 ret = score_get_best(&aft_row, &afd->score);
438 if (ret < 0)
439 return ret;
440 ret = open_and_update_audio_file(aft_row, afd);
441 if (ret >= 0)
442 return ret;
443 }
444 }
445
446 /**
447 * Free all resources which were allocated by open_next_audio_file().
448 *
449 * \param afd The structure previously filled in by open_next_audio_file().
450 *
451 * \return The return value of the underlying call to para_munmap().
452 *
453 * \sa open_next_audio_file().
454 */
455 int close_audio_file(struct audio_file_data *afd)
456 {
457 free(afd->afhi.chunk_table);
458 return para_munmap(afd->map.data, afd->map.size);
459 }
460
461 static enum play_mode init_admissible_files(void)
462 {
463 int ret;
464
465 if (conf.mood_given) {
466 ret = change_current_mood(conf.mood_arg);
467 if (ret >= 0) {
468 if (conf.playlist_given)
469 PARA_WARNING_LOG("ignoring playlist %s\n",
470 conf.playlist_arg);
471 return PLAY_MODE_MOOD;
472 }
473 }
474 if (conf.playlist_given) {
475 ret = playlist_open(conf.playlist_arg);
476 if (ret >= 0)
477 return PLAY_MODE_PLAYLIST;
478 }
479 ret = change_current_mood(NULL); /* open first available mood */
480 if (ret >= 0)
481 return PLAY_MODE_MOOD;
482 change_current_mood(""); /* open dummy mood, always successful */
483 return PLAY_MODE_MOOD;
484 }
485
486 static int setup_command_socket_or_die(void)
487 {
488 int ret;
489 char *socket_name = conf.afs_socket_arg;
490 struct sockaddr_un unix_addr;
491
492 unlink(socket_name);
493 ret = create_local_socket(socket_name, &unix_addr,
494 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
495 if (ret < 0) {
496 PARA_EMERG_LOG("%s: %s\n", PARA_STRERROR(-ret), socket_name);
497 exit(EXIT_FAILURE);
498 }
499 if (listen(ret , 5) < 0) {
500 PARA_EMERG_LOG("%s", "can not listen on socket\n");
501 exit(EXIT_FAILURE);
502 }
503 PARA_INFO_LOG("listening on command socket %s (fd %d)\n", socket_name,
504 ret);
505 return ret;
506 }
507
508 static void close_afs_tables(enum osl_close_flags flags)
509 {
510 PARA_NOTICE_LOG("closing afs_tables\n");
511 score_shutdown(flags);
512 attribute_shutdown(flags);
513 close_current_mood();
514 playlist_close();
515 moods_shutdown(flags);
516 playlists_shutdown(flags);
517 lyrics_shutdown(flags);
518 images_shutdown(flags);
519 aft_shutdown(flags);
520 }
521
522 static char *database_dir;
523
524 static int make_database_dir(void)
525 {
526 int ret;
527
528 if (!database_dir) {
529 if (conf.afs_database_dir_given)
530 database_dir = para_strdup(conf.afs_database_dir_arg);
531 else {
532 char *home = para_homedir();
533 database_dir = make_message(
534 "%s/.paraslash/afs_database", home);
535 free(home);
536 }
537 }
538 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
539 ret = para_mkdir(database_dir, 0777);
540 if (ret >= 0 || is_errno(-ret, EEXIST))
541 return 1;
542 free(database_dir);
543 database_dir = NULL;
544 return ret;
545 }
546
547
548 static int open_afs_tables(void)
549 {
550 int ret = make_database_dir();
551
552 if (ret < 0)
553 return ret;
554 ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES], database_dir);
555 if (ret < 0)
556 return ret;
557 ret = moods_init(&afs_tables[TBLNUM_MOODS], database_dir);
558 if (ret < 0)
559 goto moods_init_error;
560 ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST], database_dir);
561 if (ret < 0)
562 goto playlists_init_error;
563 ret = lyrics_init(&afs_tables[TBLNUM_LYRICS], database_dir);
564 if (ret < 0)
565 goto lyrics_init_error;
566 ret = images_init(&afs_tables[TBLNUM_IMAGES], database_dir);
567 if (ret < 0)
568 goto images_init_error;
569 ret = score_init(&afs_tables[TBLNUM_SCORES], database_dir);
570 if (ret < 0)
571 goto score_init_error;
572 ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES], database_dir);
573 if (ret < 0)
574 goto aft_init_error;
575 return 1;
576
577 aft_init_error:
578 score_shutdown(OSL_MARK_CLEAN);
579 score_init_error:
580 images_shutdown(OSL_MARK_CLEAN);
581 images_init_error:
582 lyrics_shutdown(OSL_MARK_CLEAN);
583 lyrics_init_error:
584 playlists_shutdown(OSL_MARK_CLEAN);
585 playlists_init_error:
586 moods_shutdown(OSL_MARK_CLEAN);
587 moods_init_error:
588 attribute_shutdown(OSL_MARK_CLEAN);
589 return ret;
590 }
591
592 static int server_socket;
593 static struct command_task command_task_struct;
594 static struct signal_task signal_task_struct;
595
596 static void unregister_tasks(void)
597 {
598 unregister_task(&command_task_struct.task);
599 unregister_task(&signal_task_struct.task);
600 }
601
602 static void signal_pre_select(struct sched *s, struct task *t)
603 {
604 struct signal_task *st = t->private_data;
605 t->ret = 1;
606 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
607 }
608
609 static void signal_post_select(struct sched *s, struct task *t)
610 {
611 struct signal_task *st = t->private_data;
612 t->ret = 1;
613 if (!FD_ISSET(st->fd, &s->rfds))
614 return;
615 st->signum = para_next_signal();
616 t->ret = 1;
617 if (st->signum == SIGUSR1)
618 return; /* ignore SIGUSR1 */
619 if (st->signum == SIGHUP) {
620 close_afs_tables(OSL_MARK_CLEAN);
621 t->ret = open_afs_tables();
622 return;
623 }
624 PARA_NOTICE_LOG("caught signal %d\n", st->signum);
625 t->ret = -E_AFS_SIGNAL;
626 unregister_tasks();
627 }
628
629 static void register_signal_task(void)
630 {
631 struct signal_task *st = &signal_task_struct;
632 st->fd = para_signal_init();
633 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
634 para_install_sighandler(SIGINT);
635 para_install_sighandler(SIGTERM);
636 para_install_sighandler(SIGPIPE);
637 para_install_sighandler(SIGHUP);
638
639 st->task.pre_select = signal_pre_select;
640 st->task.post_select = signal_post_select;
641 st->task.private_data = st;
642 sprintf(st->task.status, "signal task");
643 register_task(&st->task);
644 }
645
646 static struct list_head afs_client_list;
647
648 struct afs_client {
649 struct list_head node;
650 int fd;
651 struct timeval connect_time;
652 };
653
654 static void command_pre_select(struct sched *s, struct task *t)
655 {
656 struct command_task *ct = t->private_data;
657 struct afs_client *client;
658
659 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
660 list_for_each_entry(client, &afs_client_list, node)
661 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
662 t->ret = 1;
663 }
664
665 /*
666 * On errors, negative value is written to fd.
667 * On success: If query produced a result, the result_shmid is written to fd.
668 * Otherwise, zero is written.
669 */
670 static int call_callback(int fd, int query_shmid)
671 {
672 void *query_shm, *result_shm;
673 struct callback_query *cq;
674 struct callback_result *cr;
675 struct osl_object query, result = {.data = NULL};
676 int result_shmid = -1, ret, ret2;
677
678 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
679 if (ret < 0)
680 goto out;
681 cq = query_shm;
682 query.data = (char *)query_shm + sizeof(*cq);
683 query.size = cq->query_size;
684 ret = cq->handler(&query, &result);
685 ret2 = shm_detach(query_shm);
686 if (ret2 < 0 && ret >= 0)
687 ret = ret2;
688 if (ret < 0)
689 goto out;
690 ret = 0;
691 if (!result.data || !result.size)
692 goto out;
693 ret = shm_new(result.size + sizeof(struct callback_result));
694 if (ret < 0)
695 goto out;
696 result_shmid = ret;
697 ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
698 if (ret < 0)
699 goto out;
700 cr = result_shm;
701 cr->result_size = result.size;
702 memcpy(result_shm + sizeof(*cr), result.data, result.size);
703 ret = shm_detach(result_shm);
704 if (ret < 0)
705 goto out;
706 ret = result_shmid;
707 out:
708 free(result.data);
709 ret2 = send_bin_buffer(fd, (char *)&ret, sizeof(int));
710 if (ret < 0 || ret2 < 0) {
711 if (result_shmid >= 0)
712 if (shm_destroy(result_shmid) < 0)
713 PARA_ERROR_LOG("destroy result failed\n");
714 if (ret >= 0)
715 ret = ret2;
716 }
717 return ret;
718 }
719
720 static void execute_afs_command(int fd, uint32_t expected_cookie)
721 {
722 uint32_t cookie;
723 int query_shmid;
724 char buf[sizeof(cookie) + sizeof(query_shmid)];
725 int ret = recv_bin_buffer(fd, buf, sizeof(buf));
726
727 if (ret < 0) {
728 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
729 return;
730 }
731 if (ret != sizeof(buf)) {
732 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
733 ret, (long unsigned) sizeof(buf));
734 return;
735 }
736 cookie = *(uint32_t *)buf;
737 if (cookie != expected_cookie) {
738 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
739 (unsigned)cookie, (unsigned)expected_cookie);
740 return;
741 }
742 query_shmid = *(int *)(buf + sizeof(cookie));
743 if (query_shmid < 0) {
744 PARA_WARNING_LOG("received invalid query shmid %d)\n",
745 query_shmid);
746 return;
747 }
748 /* Ignore return value: Errors might be OK here. */
749 call_callback(fd, query_shmid);
750 }
751
752 /** Shutdown connection if query has not arrived until this many seconds. */
753 #define AFS_CLIENT_TIMEOUT 3
754
755 static void command_post_select(struct sched *s, struct task *t)
756 {
757 struct command_task *ct = t->private_data;
758 struct sockaddr_un unix_addr;
759 struct afs_client *client, *tmp;
760
761 /* First, check the list of connected clients. */
762 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
763 if (FD_ISSET(client->fd, &s->rfds))
764 execute_afs_command(client->fd, ct->cookie);
765 else { /* prevent bogus connection flooding */
766 struct timeval diff;
767 tv_diff(now, &client->connect_time, &diff);
768 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
769 continue;
770 PARA_WARNING_LOG("connection timeout\n");
771 }
772 close(client->fd);
773 list_del(&client->node);
774 free(client);
775 }
776 /* Next, accept connections on the local socket. */
777 if (!FD_ISSET(ct->fd, &s->rfds))
778 goto out;
779 t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
780 if (t->ret < 0) {
781 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
782 goto out;
783 }
784 client = para_malloc(sizeof(*client));
785 client->fd = t->ret;
786 client->connect_time = *now;
787 para_list_add(&client->node, &afs_client_list);
788 out:
789 t->ret = 1;
790 }
791
792 static void register_command_task(uint32_t cookie)
793 {
794 struct command_task *ct = &command_task_struct;
795 ct->fd = setup_command_socket_or_die();
796 ct->cookie = cookie;
797
798 ct->task.pre_select = command_pre_select;
799 ct->task.post_select = command_post_select;
800 ct->task.private_data = ct;
801 sprintf(ct->task.status, "command task");
802 register_task(&ct->task);
803 }
804
805 static void register_tasks(uint32_t cookie)
806 {
807 register_signal_task();
808 register_command_task(cookie);
809 }
810
811 /**
812 * Initialize the audio file selector process.
813 *
814 * \param cookie The value used for "authentication".
815 * \param socket_fd File descriptor used for communication with the server.
816 */
817 __noreturn void afs_init(uint32_t cookie, int socket_fd)
818 {
819 enum play_mode current_play_mode;
820 struct sched s;
821 int ret;
822
823 INIT_LIST_HEAD(&afs_client_list);
824 ret = open_afs_tables();
825
826 if (ret < 0) {
827 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
828 exit(EXIT_FAILURE);
829 }
830 server_socket = socket_fd;
831 ret = mark_fd_nonblock(server_socket);
832 if (ret < 0)
833 exit(EXIT_FAILURE);
834 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
835 server_socket, (unsigned) cookie);
836 current_play_mode = init_admissible_files();
837 register_tasks(cookie);
838 s.default_timeout.tv_sec = 0;
839 s.default_timeout.tv_usec = 99 * 1000;
840 ret = sched(&s);
841 if (ret < 0)
842 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
843 close_afs_tables(OSL_MARK_CLEAN);
844 exit(EXIT_FAILURE);
845 }
846
847 static int create_tables_callback(const struct osl_object *query,
848 __a_unused struct osl_object *result)
849 {
850 uint32_t table_mask = *(uint32_t *)query->data;
851 int i, ret;
852
853 close_afs_tables(OSL_MARK_CLEAN);
854 for (i = 0; i < NUM_AFS_TABLES; i++) {
855 struct table_info *ti = afs_tables + i;
856
857 if (ti->flags & TBLFLAG_SKIP_CREATE)
858 continue;
859 if (!(table_mask & (1 << i)))
860 continue;
861 ret = osl_create_table(ti->desc);
862 if (ret < 0)
863 return ret;
864 }
865 ret = open_afs_tables();
866 return ret < 0? ret: 0;
867 }
868
869 int com_init(int fd, int argc, char * const * const argv)
870 {
871 int i, j, ret;
872 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
873 struct osl_object query = {.data = &table_mask,
874 .size = sizeof(table_mask)};
875
876 if (argc != 1) {
877 table_mask = 0;
878 for (i = 1; i < argc; i++) {
879 for (j = 0; j < NUM_AFS_TABLES; j++) {
880 struct table_info *ti = afs_tables + j;
881
882 if (ti->flags & TBLFLAG_SKIP_CREATE)
883 continue;
884 if (strcmp(argv[i], ti->desc->name))
885 continue;
886 table_mask |= (1 << j);
887 break;
888 }
889 if (j == NUM_AFS_TABLES)
890 return -E_BAD_TABLE_NAME;
891 }
892 }
893 ret = send_callback_request(create_tables_callback, &query, NULL);
894 if (ret < 0)
895 return ret;
896 return send_va_buffer(fd, "successfully created afs table(s)\n");
897 }
898
899 /**
900 * Flags for the check command.
901 *
902 * \sa com_check().
903 */
904 enum com_check_flags {
905 /** Check the audio file table. */
906 CHECK_AFT = 1,
907 /** Check the mood table. */
908 CHECK_MOODS = 2,
909 /** Check the playlist table. */
910 CHECK_PLAYLISTS = 4
911 };
912
913 int com_check(int fd, int argc, char * const * const argv)
914 {
915 unsigned flags = 0;
916 int i, ret;
917 struct osl_object result;
918
919 for (i = 1; i < argc; i++) {
920 const char *arg = argv[i];
921 if (arg[0] != '-')
922 break;
923 if (!strcmp(arg, "--")) {
924 i++;
925 break;
926 }
927 if (!strcmp(arg, "-a")) {
928 flags |= CHECK_AFT;
929 continue;
930 }
931 if (!strcmp(arg, "-p")) {
932 flags |= CHECK_PLAYLISTS;
933 continue;
934 }
935 if (!strcmp(arg, "-m")) {
936 flags |= CHECK_MOODS;
937 continue;
938 }
939 return -E_AFS_SYNTAX;
940 }
941 if (i < argc)
942 return -E_AFS_SYNTAX;
943 if (!flags)
944 flags = ~0U;
945 if (flags & CHECK_AFT) {
946 ret = send_callback_request(aft_check_callback, NULL, &result);
947 if (ret < 0)
948 return ret;
949 if (ret > 0) {
950 ret = send_buffer(fd, (char *) result.data);
951 free(result.data);
952 if (ret < 0)
953 return ret;
954 }
955 }
956 if (flags & CHECK_PLAYLISTS) {
957 ret = send_callback_request(playlist_check_callback, NULL, &result);
958 if (ret < 0)
959 return ret;
960 if (ret > 0) {
961 ret = send_buffer(fd, (char *) result.data);
962 free(result.data);
963 if (ret < 0)
964 return ret;
965 }
966 }
967 if (flags & CHECK_MOODS) {
968 ret = send_callback_request(mood_check_callback, NULL, &result);
969 if (ret < 0)
970 return ret;
971 if (ret > 0) {
972 ret = send_buffer(fd, (char *) result.data);
973 free(result.data);
974 if (ret < 0)
975 return ret;
976 }
977 }
978 return 1;
979 }