bef35425b9fd873bd652ee92ed2462738d1d158c
[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 <fnmatch.h>
10 #include "server.cmdline.h"
11 #include "para.h"
12 #include "afh.h"
13 #include "server.h"
14 #include "error.h"
15 #include <dirent.h> /* readdir() */
16 #include <sys/mman.h>
17 #include <sys/time.h>
18 #include "net.h"
19 #include "afs.h"
20 #include "ipc.h"
21 #include "string.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "signal.h"
25 #include "fd.h"
26
27 /** The osl tables used by afs. \sa blob.c. */
28 enum afs_table_num {
29 /** Contains audio file information. See aft.c. */
30 TBLNUM_AUDIO_FILES,
31 /** The table for the paraslash attributes. See attribute.c. */
32 TBLNUM_ATTRIBUTES,
33 /**
34 * Paraslash's scoring system is based on Gaussian normal
35 * distributions, and the relevant data is stored in the rbtrees of an
36 * osl table containing only volatile columns. See score.c for
37 * details.
38 */
39 TBLNUM_SCORES,
40 /**
41 * A standard blob table containing the mood definitions. For details
42 * see mood.c.
43 */
44 TBLNUM_MOODS,
45 /** A blob table containing lyrics on a per-song basis. */
46 TBLNUM_LYRICS,
47 /** Another blob table for images (for example album cover art). */
48 TBLNUM_IMAGES,
49 /** Yet another blob table for storing standard playlists. */
50 TBLNUM_PLAYLIST,
51 /** How many tables are in use? */
52 NUM_AFS_TABLES
53 };
54
55 static struct table_info afs_tables[NUM_AFS_TABLES];
56
57 struct command_task {
58 /** The file descriptor for the local socket. */
59 int fd;
60 /**
61 * Value sent by the command handlers to identify themselves as
62 * children of the running para_server.
63 */
64 uint32_t cookie;
65 /** The associated task structure. */
66 struct task task;
67 };
68
69 /**
70 * A random number used to "authenticate" the connection.
71 *
72 * para_server picks this number by random before forking the afs process. The
73 * command handlers write this number together with the id of the shared memory
74 * area containing the query. This way, a malicious local user has to know this
75 * number to be able to cause the afs process to crash by sending fake queries.
76 */
77 extern uint32_t afs_socket_cookie;
78
79 /**
80 * Struct to let command handlers execute a callback in afs context.
81 *
82 * Commands that need to change the state of afs can't change the relevant data
83 * structures directly because commands are executed in a child process, i.e.
84 * they get their own virtual address space.
85 *
86 * This structure is used by \p send_callback_request() (executed from handler
87 * context) in order to let the afs process call the specified function. An
88 * instance of that structure is written to a shared memory area together with
89 * the arguments to the callback function. The identifier of the shared memory
90 * area is written to the command socket.
91 *
92 * The afs process accepts connections on the command socket and reads the
93 * shared memory id, attaches the corresponing area, calls the given handler to
94 * perform the desired action and to optionally compute a result.
95 *
96 * The result and a \p callback_result structure is then written to another
97 * shared memory area. The identifier for that area is written to the handler's
98 * command socket, so that the handler process can read the id, attach the
99 * shared memory area and use the result.
100 *
101 * \sa struct callback_result.
102 */
103 struct callback_query {
104 /** The function to be called. */
105 callback_function *handler;
106 /** The number of bytes of the query */
107 size_t query_size;
108 };
109
110 /**
111 * Structure embedded in the result of a callback.
112 *
113 * If the callback produced a result, an instance of that structure is embeeded
114 * into the shared memory area holding the result, mainly to let the command
115 * handler know the size of the result.
116 *
117 * \sa struct callback_query.
118 */
119 struct callback_result {
120 /** The number of bytes of the result. */
121 size_t result_size;
122 };
123
124 /**
125 * Ask the parent process to call a given function.
126 *
127 * \param f The function to be called.
128 * \param query Pointer to arbitrary data for the callback.
129 * \param result Callback result will be stored here.
130 *
131 * This function creates a shared memory area, copies the buffer pointed to by
132 * \a buf to that area and notifies the afs process that \a f should be
133 * called ASAP.
134 *
135 * \return Negative, on errors, the return value of the callback function
136 * otherwise.
137 *
138 * \sa send_option_arg_callback_request(), send_standard_callback_request().
139 */
140 int send_callback_request(callback_function *f, struct osl_object *query,
141 struct osl_object *result)
142 {
143 struct callback_query *cq;
144 struct callback_result *cr;
145 int ret, fd = -1, query_shmid, result_shmid;
146 void *query_shm, *result_shm;
147 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
148 struct sockaddr_un unix_addr;
149 size_t query_shm_size = sizeof(*cq);
150
151 if (query)
152 query_shm_size += query->size;
153 ret = shm_new(query_shm_size);
154 if (ret < 0)
155 return ret;
156 query_shmid = ret;
157 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
158 if (ret < 0)
159 goto out;
160 cq = query_shm;
161 cq->handler = f;
162 cq->query_size = query_shm_size - sizeof(*cq);
163
164 if (query)
165 memcpy(query_shm + sizeof(*cq), query->data, query->size);
166 ret = shm_detach(query_shm);
167 if (ret < 0)
168 goto out;
169
170 *(uint32_t *) buf = afs_socket_cookie;
171 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
172
173 ret = get_stream_socket(PF_UNIX);
174 if (ret < 0)
175 goto out;
176 fd = ret;
177 ret = init_unix_addr(&unix_addr, conf.afs_socket_arg);
178 if (ret < 0)
179 goto out;
180 ret = PARA_CONNECT(fd, &unix_addr);
181 if (ret < 0)
182 goto out;
183 ret = send_bin_buffer(fd, buf, sizeof(buf));
184 if (ret < 0)
185 goto out;
186 ret = recv_bin_buffer(fd, buf, sizeof(buf));
187 if (ret < 0)
188 goto out;
189 if (ret != sizeof(int)) {
190 ret = -E_RECV;
191 goto out;
192 }
193 ret = *(int *) buf;
194 if (ret <= 0)
195 goto out;
196 result_shmid = ret;
197 ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
198 if (ret >= 0) {
199 assert(result);
200 cr = result_shm;
201 result->size = cr->result_size;
202 result->data = para_malloc(result->size);
203 memcpy(result->data, result_shm + sizeof(*cr), result->size);
204 ret = shm_detach(result_shm);
205 if (ret < 0)
206 PARA_ERROR_LOG("can not detach result\n");
207 } else
208 PARA_ERROR_LOG("attach result failed: %d\n", ret);
209 if (shm_destroy(result_shmid) < 0)
210 PARA_ERROR_LOG("destroy result failed\n");
211 ret = 1;
212 out:
213 if (shm_destroy(query_shmid) < 0)
214 PARA_ERROR_LOG("%s\n", "shm destroy error");
215 if (fd >= 0)
216 close(fd);
217 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
218 return ret;
219 }
220
221 /**
222 * Send a callback request passing an options structure and an argument vector.
223 *
224 * \param options pointer to an arbitrary data structure.
225 * \param argc Argument count.
226 * \param argv Standard argument vector.
227 * \param f The callback function.
228 * \param result The result of the query is stored here.
229 *
230 * Some commands have a couple of options that are parsed in child context for
231 * syntactic correctness and are stored in a special options structure for that
232 * command. This function allows to pass such a structure together with a list
233 * of further arguments (often a list of audio files) to the parent process.
234 *
235 * \sa send_standard_callback_request(), send_callback_request().
236 */
237 int send_option_arg_callback_request(struct osl_object *options,
238 int argc, char * const * const argv, callback_function *f,
239 struct osl_object *result)
240 {
241 char *p;
242 int i, ret;
243 struct osl_object query = {.size = options? options->size : 0};
244
245 for (i = 0; i < argc; i++)
246 query.size += strlen(argv[i]) + 1;
247 query.data = para_malloc(query.size);
248 p = query.data;
249 if (options) {
250 memcpy(query.data, options->data, options->size);
251 p += options->size;
252 }
253 for (i = 0; i < argc; i++) {
254 strcpy(p, argv[i]); /* OK */
255 p += strlen(argv[i]) + 1;
256 }
257 ret = send_callback_request(f, &query, result);
258 free(query.data);
259 return ret;
260 }
261
262 /**
263 * Send a callback request with an argument vector only.
264 *
265 * \param argc The same meaning as in send_option_arg_callback_request().
266 * \param argv The same meaning as in send_option_arg_callback_request().
267 * \param f The same meaning as in send_option_arg_callback_request().
268 * \param result The same meaning as in send_option_arg_callback_request().
269 *
270 * This is similar to send_option_arg_callback_request(), but no options buffer
271 * is passed to the parent process.
272 *
273 * \return The return value of the underlying call to
274 * send_option_arg_callback_request().
275 */
276 int send_standard_callback_request(int argc, char * const * const argv,
277 callback_function *f, struct osl_object *result)
278 {
279 return send_option_arg_callback_request(NULL, argc, argv, f, result);
280 }
281
282 static int action_if_pattern_matches(struct osl_row *row, void *data)
283 {
284 struct pattern_match_data *pmd = data;
285 struct osl_object name_obj;
286 const char *p, *name;
287 int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
288 const char *pattern_txt = (const char *)pmd->patterns.data;
289
290 if (ret < 0)
291 return ret;
292 name = (char *)name_obj.data;
293 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
294 return 1;
295 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
296 return pmd->action(pmd->table, row, name, pmd->data);
297 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
298 p += strlen(p) + 1) {
299 ret = fnmatch(p, name, pmd->fnmatch_flags);
300 if (ret == FNM_NOMATCH)
301 continue;
302 if (ret)
303 return -E_FNMATCH;
304 return pmd->action(pmd->table, row, name, pmd->data);
305 }
306 return 1;
307 }
308
309 int for_each_matching_row(struct pattern_match_data *pmd)
310 {
311 if (pmd->pm_flags & PM_REVERSE_LOOP)
312 return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
313 action_if_pattern_matches);
314 return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
315 action_if_pattern_matches);
316 }
317
318 /**
319 * Compare two osl objects of string type.
320 *
321 * \param obj1 Pointer to the first object.
322 * \param obj2 Pointer to the second object.
323 *
324 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
325 * are taken into account.
326 *
327 * \return It returns an integer less than, equal to, or greater than zero if
328 * \a obj1 is found, respectively, to be less than, to match, or be greater than
329 * obj2.
330 *
331 * \sa strcmp(3), strncmp(3), osl_compare_func.
332 */
333 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
334 {
335 const char *str1 = (const char *)obj1->data;
336 const char *str2 = (const char *)obj2->data;
337 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
338 }
339
340 /**
341 * A wrapper for strtol(3).
342 *
343 * \param str The string to be converted to a long integer.
344 * \param result The converted value is stored here.
345 *
346 * \return Positive on success, -E_ATOL on errors.
347 *
348 * \sa strtol(3), atoi(3).
349 */
350 int para_atol(const char *str, long *result)
351 {
352 char *endptr;
353 long val;
354 int ret, base = 10;
355
356 errno = 0; /* To distinguish success/failure after call */
357 val = strtol(str, &endptr, base);
358 ret = -E_ATOL;
359 if (errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
360 goto out; /* overflow */
361 if (errno != 0 && val == 0)
362 goto out; /* other error */
363 if (endptr == str)
364 goto out; /* No digits were found */
365 if (*endptr != '\0')
366 goto out; /* Further characters after number */
367 *result = val;
368 ret = 1;
369 out:
370 return ret;
371 }
372
373
374 /*
375 * write input from fd to dynamically allocated buffer,
376 * but maximal max_size byte.
377 */
378 static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
379 {
380 const size_t chunk_size = 1024;
381 size_t size = 2048, received = 0;
382 int ret;
383 char *buf = para_malloc(size);
384
385 for (;;) {
386 ret = recv_bin_buffer(fd, buf + received, chunk_size);
387 if (ret <= 0)
388 break;
389 received += ret;
390 if (received + chunk_size >= size) {
391 size *= 2;
392 ret = -E_INPUT_TOO_LARGE;
393 if (size > max_size)
394 break;
395 buf = para_realloc(buf, size);
396 }
397 }
398 obj->data = buf;
399 obj->size = received;
400 if (ret < 0)
401 free(buf);
402 return ret;
403 }
404
405 /**
406 * Read data from a file descriptor, and send it to the afs process.
407 *
408 * \param fd File descriptor to read data from.
409 * \param arg_obj Pointer to the arguments to \a f.
410 * \param f The callback function.
411 * \param max_len Don't read more than that many bytes from stdin.
412 * \param result The result of the query is stored here.
413 *
414 * This function is used by commands that wish to let para_server store
415 * arbitrary data specified by the user (for instance the add_blob family of
416 * commands). First, at most \a max_len bytes are read from \a fd, the result
417 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
418 * is made available to the parent process via shared memory.
419 *
420 * \return Negative on errors, the return value of the underlying call to
421 * send_callback_request() otherwise.
422 */
423 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
424 unsigned max_len, struct osl_object *result)
425 {
426 struct osl_object query, stdin_obj;
427 int ret;
428
429 ret = send_buffer(fd, AWAITING_DATA_MSG);
430 if (ret < 0)
431 return ret;
432 ret = fd2buf(fd, max_len, &stdin_obj);
433 if (ret < 0)
434 return ret;
435 query.size = arg_obj->size + stdin_obj.size;
436 query.data = para_malloc(query.size);
437 memcpy(query.data, arg_obj->data, arg_obj->size);
438 memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
439 free(stdin_obj.data);
440 ret = send_callback_request(f, &query, result);
441 free(query.data);
442 return ret;
443 }
444
445 /**
446 * Open the audio file with highest score.
447 *
448 * \param afd Audio file data is returned here.
449 *
450 * This stores all information for streaming the "best" audio file
451 * in the \a afd structure.
452 *
453 * \return Positive on success, negative on errors.
454 *
455 * \sa close_audio_file(), open_and_update_audio_file().
456 */
457 int open_next_audio_file(struct audio_file_data *afd)
458 {
459 struct osl_row *aft_row;
460 int ret;
461 for (;;) {
462 ret = score_get_best(&aft_row, &afd->score);
463 if (ret < 0)
464 return ret;
465 ret = open_and_update_audio_file(aft_row, afd);
466 if (ret >= 0)
467 return ret;
468 }
469 }
470
471 /**
472 * Free all resources which were allocated by open_next_audio_file().
473 *
474 * \param afd The structure previously filled in by open_next_audio_file().
475 *
476 * \return The return value of the underlying call to para_munmap().
477 *
478 * \sa open_next_audio_file().
479 */
480 int close_audio_file(struct audio_file_data *afd)
481 {
482 free(afd->afhi.chunk_table);
483 return para_munmap(afd->map.data, afd->map.size);
484 }
485
486 #if 0
487 static void play_loop(enum play_mode current_play_mode)
488 {
489 int i, ret;
490 struct audio_file_data afd;
491
492 afd.current_play_mode = current_play_mode;
493 for (i = 0; i < 0; i++) {
494 ret = open_next_audio_file(&afd);
495 if (ret < 0) {
496 PARA_ERROR_LOG("failed to open next audio file: %d\n", ret);
497 return;
498 }
499 PARA_NOTICE_LOG("next audio file: %s, score: %li\n", afd.path, afd.score);
500 sleep(1);
501 close_audio_file(&afd);
502 }
503 }
504 #endif
505
506
507 static enum play_mode init_admissible_files(void)
508 {
509 int ret;
510 char *given_mood, *given_playlist;
511
512 given_mood = "mood_that_was_given_at_the_command_line";
513 given_playlist = "given_playlist";
514
515 if (given_mood) {
516 ret = change_current_mood(given_mood);
517 if (ret >= 0) {
518 if (given_playlist)
519 PARA_WARNING_LOG("ignoring playlist %s\n",
520 given_playlist);
521 return PLAY_MODE_MOOD;
522 }
523 }
524 if (given_playlist) {
525 ret = playlist_open(given_playlist);
526 if (ret >= 0)
527 return PLAY_MODE_PLAYLIST;
528 }
529 ret = change_current_mood(NULL); /* open first available mood */
530 if (ret >= 0)
531 return PLAY_MODE_MOOD;
532 change_current_mood(""); /* open dummy mood, always successful */
533 return PLAY_MODE_MOOD;
534 }
535
536 static int setup_command_socket_or_die(void)
537 {
538 int ret;
539 char *socket_name = conf.afs_socket_arg;
540 struct sockaddr_un unix_addr;
541
542 unlink(socket_name);
543 ret = create_local_socket(socket_name, &unix_addr,
544 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
545 if (ret < 0) {
546 PARA_EMERG_LOG("%s: %s\n", PARA_STRERROR(-ret), socket_name);
547 exit(EXIT_FAILURE);
548 }
549 if (listen(ret , 5) < 0) {
550 PARA_EMERG_LOG("%s", "can not listen on socket\n");
551 exit(EXIT_FAILURE);
552 }
553 PARA_INFO_LOG("listening on command socket %s (fd %d)\n", socket_name,
554 ret);
555 return ret;
556 }
557
558 static int server_socket;
559 static struct command_task command_task_struct;
560 static struct signal_task signal_task_struct;
561
562 static void unregister_tasks(void)
563 {
564 unregister_task(&command_task_struct.task);
565 unregister_task(&signal_task_struct.task);
566 }
567
568 static void close_afs_tables(enum osl_close_flags flags)
569 {
570 PARA_NOTICE_LOG("closing afs_tables\n");
571 score_shutdown(flags);
572 attribute_shutdown(flags);
573 close_current_mood();
574 playlist_close();
575 moods_shutdown(flags);
576 playlists_shutdown(flags);
577 lyrics_shutdown(flags);
578 images_shutdown(flags);
579 aft_shutdown(flags);
580 }
581
582 static void signal_pre_select(struct sched *s, struct task *t)
583 {
584 struct signal_task *st = t->private_data;
585 t->ret = 1;
586 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
587 }
588
589 static void signal_post_select(struct sched *s, struct task *t)
590 {
591 struct signal_task *st = t->private_data;
592 t->ret = 1;
593 if (!FD_ISSET(st->fd, &s->rfds))
594 return;
595 st->signum = para_next_signal();
596 t->ret = 1;
597 if (st->signum == SIGUSR1)
598 return; /* ignore SIGUSR1 */
599 PARA_NOTICE_LOG("caught signal %d\n", st->signum);
600 t->ret = -E_SIGNAL_CAUGHT;
601 unregister_tasks();
602 }
603
604 static void register_signal_task(void)
605 {
606 struct signal_task *st = &signal_task_struct;
607 st->fd = para_signal_init();
608 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
609 para_install_sighandler(SIGINT);
610 para_install_sighandler(SIGTERM);
611 para_install_sighandler(SIGPIPE);
612
613 st->task.pre_select = signal_pre_select;
614 st->task.post_select = signal_post_select;
615 st->task.private_data = st;
616 sprintf(st->task.status, "signal task");
617 register_task(&st->task);
618 }
619
620 static void command_pre_select(struct sched *s, struct task *t)
621 {
622 struct command_task *ct = t->private_data;
623 t->ret = 1;
624 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
625 }
626
627 /*
628 * On errors, negative value is written to fd.
629 * On success: If query produced a result, the result_shmid is written to fd.
630 * Otherwise, zero is written.
631 */
632 static int call_callback(int fd, int query_shmid)
633 {
634 void *query_shm, *result_shm;
635 struct callback_query *cq;
636 struct callback_result *cr;
637 struct osl_object query, result = {.data = NULL};
638 int result_shmid = -1, ret, ret2;
639
640 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
641 if (ret < 0)
642 goto out;
643 cq = query_shm;
644 query.data = (char *)query_shm + sizeof(*cq);
645 query.size = cq->query_size;
646 ret = cq->handler(&query, &result);
647 ret2 = shm_detach(query_shm);
648 if (ret2 < 0 && ret >= 0)
649 ret = ret2;
650 if (ret < 0)
651 goto out;
652 ret = 0;
653 if (!result.data || !result.size)
654 goto out;
655 ret = shm_new(result.size + sizeof(struct callback_result));
656 if (ret < 0)
657 goto out;
658 result_shmid = ret;
659 ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
660 if (ret < 0)
661 goto out;
662 cr = result_shm;
663 cr->result_size = result.size;
664 memcpy(result_shm + sizeof(*cr), result.data, result.size);
665 ret = shm_detach(result_shm);
666 if (ret < 0)
667 goto out;
668 ret = result_shmid;
669 out:
670 free(result.data);
671 ret2 = send_bin_buffer(fd, (char *)&ret, sizeof(int));
672 if (ret < 0 || ret2 < 0) {
673 if (result_shmid >= 0)
674 if (shm_destroy(result_shmid) < 0)
675 PARA_ERROR_LOG("destroy result failed\n");
676 if (ret >= 0)
677 ret = ret2;
678 }
679 return ret;
680 }
681
682 static void command_post_select(struct sched *s, struct task *t)
683 {
684 struct command_task *ct = t->private_data;
685 struct sockaddr_un unix_addr;
686 char buf[sizeof(uint32_t) + sizeof(int)];
687 uint32_t cookie;
688 int query_shmid, fd;
689
690 t->ret = 1;
691 if (!FD_ISSET(ct->fd, &s->rfds))
692 return;
693 t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
694 if (t->ret < 0)
695 return;
696 /*
697 * The following errors may be caused by a malicious local user. So do
698 * not return an error in this case as this would terminate para_afs
699 * and para_server.
700 */
701 fd = t->ret;
702 /* FIXME: This is easily dosable (peer doesn't send data) */
703 t->ret = recv_bin_buffer(fd, buf, sizeof(buf));
704 if (t->ret < 0) {
705 PARA_NOTICE_LOG("%s (%d)\n", PARA_STRERROR(-t->ret), t->ret);
706 goto out;
707 }
708 if (t->ret != sizeof(buf)) {
709 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
710 t->ret, (long unsigned) sizeof(buf));
711 goto out;
712 }
713 cookie = *(uint32_t *)buf;
714 if (cookie != ct->cookie) {
715 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
716 (unsigned)cookie, (unsigned)ct->cookie);
717 goto out;
718 }
719 query_shmid = *(int *)(buf + sizeof(cookie));
720 if (query_shmid < 0) {
721 PARA_WARNING_LOG("received invalid query shmid %d)\n",
722 query_shmid);
723 goto out;
724 }
725 /* Ignore return value: Errors might be ok here. */
726 call_callback(fd, query_shmid);
727 out:
728 t->ret = 1;
729 close(fd);
730 }
731
732 static void register_command_task(uint32_t cookie)
733 {
734 struct command_task *ct = &command_task_struct;
735 ct->fd = setup_command_socket_or_die();
736 ct->cookie = cookie;
737
738 ct->task.pre_select = command_pre_select;
739 ct->task.post_select = command_post_select;
740 ct->task.private_data = ct;
741 sprintf(ct->task.status, "command task");
742 register_task(&ct->task);
743 }
744
745 void register_tasks(uint32_t cookie)
746 {
747 register_signal_task();
748 register_command_task(cookie);
749 }
750
751 static char *database_dir;
752
753 static int make_database_dir(void)
754 {
755 int ret;
756
757 if (!database_dir) {
758 if (conf.afs_database_dir_given)
759 database_dir = para_strdup(conf.afs_database_dir_arg);
760 else {
761 char *home = para_homedir();
762 database_dir = make_message(
763 "%s/.paraslash/afs_database", home);
764 free(home);
765 }
766 }
767 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
768 ret = para_mkdir(database_dir, 0777);
769 if (ret >= 0 || ret == -E_EXIST)
770 return 1;
771 free(database_dir);
772 database_dir = NULL;
773 return ret;
774 }
775
776 static int open_afs_tables(void)
777 {
778 int ret = make_database_dir();
779
780 if (ret < 0)
781 return ret;
782 ret = attribute_init(&afs_tables[TBLNUM_ATTRIBUTES], database_dir);
783 if (ret < 0)
784 return ret;
785 ret = moods_init(&afs_tables[TBLNUM_MOODS], database_dir);
786 if (ret < 0)
787 goto moods_init_error;
788 ret = playlists_init(&afs_tables[TBLNUM_PLAYLIST], database_dir);
789 if (ret < 0)
790 goto playlists_init_error;
791 ret = lyrics_init(&afs_tables[TBLNUM_LYRICS], database_dir);
792 if (ret < 0)
793 goto lyrics_init_error;
794 ret = images_init(&afs_tables[TBLNUM_IMAGES], database_dir);
795 if (ret < 0)
796 goto images_init_error;
797 ret = score_init(&afs_tables[TBLNUM_SCORES], database_dir);
798 if (ret < 0)
799 goto score_init_error;
800 ret = aft_init(&afs_tables[TBLNUM_AUDIO_FILES], database_dir);
801 if (ret < 0)
802 goto aft_init_error;
803 return 1;
804
805 aft_init_error:
806 score_shutdown(OSL_MARK_CLEAN);
807 score_init_error:
808 images_shutdown(OSL_MARK_CLEAN);
809 images_init_error:
810 lyrics_shutdown(OSL_MARK_CLEAN);
811 lyrics_init_error:
812 playlists_shutdown(OSL_MARK_CLEAN);
813 playlists_init_error:
814 moods_shutdown(OSL_MARK_CLEAN);
815 moods_init_error:
816 attribute_shutdown(OSL_MARK_CLEAN);
817 return ret;
818 }
819
820 __noreturn int afs_init(uint32_t cookie, int socket_fd)
821 {
822 enum play_mode current_play_mode;
823 struct sched s;
824 int 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 enum com_check_flags {
900 CHECK_AFT = 1,
901 CHECK_MOODS = 2,
902 CHECK_PLAYLISTS = 4
903 };
904
905 int com_check(int fd, int argc, char * const * const argv)
906 {
907 unsigned flags = 0;
908 int i, ret;
909 struct osl_object result;
910
911 for (i = 1; i < argc; i++) {
912 const char *arg = argv[i];
913 if (arg[0] != '-')
914 break;
915 if (!strcmp(arg, "--")) {
916 i++;
917 break;
918 }
919 if (!strcmp(arg, "-a")) {
920 flags |= CHECK_AFT;
921 continue;
922 }
923 if (!strcmp(arg, "-p")) {
924 flags |= CHECK_PLAYLISTS;
925 continue;
926 }
927 if (!strcmp(arg, "-m")) {
928 flags |= CHECK_MOODS;
929 continue;
930 }
931 return -E_AFS_SYNTAX;
932 }
933 if (i < argc)
934 return -E_AFS_SYNTAX;
935 if (!flags)
936 flags = ~0U;
937 if (flags & CHECK_AFT) {
938 ret = send_callback_request(aft_check_callback, NULL, &result);
939 if (ret < 0)
940 return ret;
941 if (ret > 0) {
942 ret = send_buffer(fd, (char *) result.data);
943 free(result.data);
944 if (ret < 0)
945 return ret;
946 }
947 }
948 if (flags & CHECK_PLAYLISTS) {
949 ret = send_callback_request(playlist_check_callback, NULL, &result);
950 if (ret < 0)
951 return ret;
952 if (ret > 0) {
953 ret = send_buffer(fd, (char *) result.data);
954 free(result.data);
955 if (ret < 0)
956 return ret;
957 }
958 }
959 if (flags & CHECK_MOODS) {
960 ret = send_callback_request(mood_check_callback, NULL, &result);
961 if (ret < 0)
962 return ret;
963 if (ret > 0) {
964 ret = send_buffer(fd, (char *) result.data);
965 free(result.data);
966 if (ret < 0)
967 return ret;
968 }
969 }
970 return 1;
971 }