2 * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.c Paraslash's audio file selector. */
11 #include "server.cmdline.h"
18 #include <dirent.h> /* readdir() */
28 /** The osl tables used by afs. \sa blob.c. */
30 /** Contains audio file information. See aft.c. */
32 /** The table for the paraslash attributes. See attribute.c. */
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
42 * A standard blob table containing the mood definitions. For details
46 /** A blob table containing lyrics on a per-song basis. */
48 /** Another blob table for images (for example album cover art). */
50 /** Yet another blob table for storing standard playlists. */
52 /** How many tables are in use? */
56 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
57 [TBLNUM_AUDIO_FILES] = {.init = aft_init},
58 [TBLNUM_ATTRIBUTES] = {.init = attribute_init},
59 [TBLNUM_SCORES] = {.init = score_init},
60 [TBLNUM_MOODS] = {.init = moods_init},
61 [TBLNUM_LYRICS] = {.init = lyrics_init},
62 [TBLNUM_IMAGES] = {.init = images_init},
63 [TBLNUM_PLAYLIST] = {.init = playlists_init},
67 /** The file descriptor for the local socket. */
70 * Value sent by the command handlers to identify themselves as
71 * children of the running para_server.
74 /** The associated task structure. */
79 extern struct misc_meta_data *mmd;
81 static int server_socket;
82 static struct command_task command_task_struct;
83 static struct signal_task signal_task_struct;
85 static enum play_mode current_play_mode;
86 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
90 * A random number used to "authenticate" the connection.
92 * para_server picks this number by random before forking the afs process. The
93 * command handlers write this number together with the id of the shared memory
94 * area containing the query. This way, a malicious local user has to know this
95 * number to be able to cause the afs process to crash by sending fake queries.
97 extern uint32_t afs_socket_cookie;
100 * Struct to let command handlers execute a callback in afs context.
102 * Commands that need to change the state of afs can't change the relevant data
103 * structures directly because commands are executed in a child process, i.e.
104 * they get their own virtual address space.
106 * This structure is used by \p send_callback_request() (executed from handler
107 * context) in order to let the afs process call the specified function. An
108 * instance of that structure is written to a shared memory area together with
109 * the arguments to the callback function. The identifier of the shared memory
110 * area is written to the command socket.
112 * The afs process accepts connections on the command socket and reads the
113 * shared memory id, attaches the corresponing area, calls the given handler to
114 * perform the desired action and to optionally compute a result.
116 * The result and a \p callback_result structure is then written to another
117 * shared memory area. The identifier for that area is written to the handler's
118 * command socket, so that the handler process can read the id, attach the
119 * shared memory area and use the result.
121 * \sa struct callback_result.
123 struct callback_query {
124 /** The function to be called. */
125 callback_function *handler;
126 /** The number of bytes of the query */
131 * Structure embedded in the result of a callback.
133 * If the callback produced a result, an instance of that structure is embeeded
134 * into the shared memory area holding the result, mainly to let the command
135 * handler know the size of the result.
137 * \sa struct callback_query.
139 struct callback_result {
140 /** The number of bytes of the result. */
145 * Ask the afs process to call a given function.
147 * \param f The function to be called.
148 * \param query Pointer to arbitrary data for the callback.
149 * \param result_handler Called for each shm area sent by the callback.
150 * \param private_result_data Passed verbatim to \a result_handler.
152 * This function creates a socket for communication with the afs process and a
153 * shared memory area (sma) to which the buffer pointed to by \a query is
154 * copied. It then notifies the afs process that the callback function \a f
155 * should be executed by sending the shared memory identifier (shmid) to the
158 * If the callback produces a result, it sends any number of shared memory
159 * identifiers back via the socket. For each such identifier received, \a
160 * result_handler is called. The contents of the sma identified by the received
161 * shmid are passed to that function as an osl object. The private_result_data
162 * pointer is passed as the second argument to \a result_handler.
164 * \return Negative, on errors, the return value of the callback function
167 * \sa send_option_arg_callback_request(), send_standard_callback_request().
169 int send_callback_request(callback_function *f, struct osl_object *query,
170 callback_result_handler *result_handler,
171 void *private_result_data)
173 struct callback_query *cq;
174 int num_results = 0, ret, fd = -1, query_shmid, result_shmid;
175 void *query_shm, *result_shm;
176 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
177 size_t query_shm_size = sizeof(*cq);
180 query_shm_size += query->size;
181 ret = shm_new(query_shm_size);
185 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
190 cq->query_size = query_shm_size - sizeof(*cq);
193 memcpy(query_shm + sizeof(*cq), query->data, query->size);
194 ret = shm_detach(query_shm);
198 *(uint32_t *) buf = afs_socket_cookie;
199 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
201 ret = create_remote_socket(conf.afs_socket_arg);
205 ret = send_bin_buffer(fd, buf, sizeof(buf));
209 ret = recv_bin_buffer(fd, buf, sizeof(int));
212 if (ret != sizeof(int)) {
213 ret = -E_AFS_SHORT_READ;
220 ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
222 struct callback_result *cr = result_shm;
223 struct osl_object result;
225 result.size = cr->result_size;
226 result.data = result_shm + sizeof(*cr);
228 assert(result_handler);
229 ret = result_handler(&result, private_result_data);
230 if (shm_detach(result_shm) < 0)
231 PARA_ERROR_LOG("can not detach result\n");
234 PARA_ERROR_LOG("attach result failed: %d\n", ret);
235 if (shm_destroy(result_shmid) < 0)
236 PARA_ERROR_LOG("destroy result failed\n");
241 if (shm_destroy(query_shmid) < 0)
242 PARA_ERROR_LOG("%s\n", "shm destroy error");
247 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
252 * Send a callback request passing an options structure and an argument vector.
254 * \param options pointer to an arbitrary data structure.
255 * \param argc Argument count.
256 * \param argv Standard argument vector.
257 * \param f The callback function.
258 * \param result_handler See \ref send_callback_request.
259 * \param private_result_data See \ref send_callback_request.
261 * Some commands have a couple of options that are parsed in child context for
262 * syntactic correctness and are stored in a special options structure for that
263 * command. This function allows to pass such a structure together with a list
264 * of further arguments (often a list of audio files) to the parent process.
266 * \sa send_standard_callback_request(), send_callback_request().
268 int send_option_arg_callback_request(struct osl_object *options,
269 int argc, char * const * const argv, callback_function *f,
270 callback_result_handler *result_handler,
271 void *private_result_data)
275 struct osl_object query = {.size = options? options->size : 0};
277 for (i = 0; i < argc; i++)
278 query.size += strlen(argv[i]) + 1;
279 query.data = para_malloc(query.size);
282 memcpy(query.data, options->data, options->size);
285 for (i = 0; i < argc; i++) {
286 strcpy(p, argv[i]); /* OK */
287 p += strlen(argv[i]) + 1;
289 ret = send_callback_request(f, &query, result_handler,
290 private_result_data);
296 * Send a callback request with an argument vector only.
298 * \param argc The same meaning as in send_option_arg_callback_request().
299 * \param argv The same meaning as in send_option_arg_callback_request().
300 * \param f The same meaning as in send_option_arg_callback_request().
301 * \param result_handler See \ref send_callback_request.
302 * \param private_result_data See \ref send_callback_request.
304 * This is similar to send_option_arg_callback_request(), but no options buffer
305 * is passed to the parent process.
307 * \return The return value of the underlying call to
308 * send_option_arg_callback_request().
310 int send_standard_callback_request(int argc, char * const * const argv,
311 callback_function *f, callback_result_handler *result_handler,
312 void *private_result_data)
314 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
315 private_result_data);
318 static int action_if_pattern_matches(struct osl_row *row, void *data)
320 struct pattern_match_data *pmd = data;
321 struct osl_object name_obj;
322 const char *p, *name;
323 int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
324 const char *pattern_txt = (const char *)pmd->patterns.data;
328 name = (char *)name_obj.data;
329 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
331 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
332 return pmd->action(pmd->table, row, name, pmd->data);
333 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
334 p += strlen(p) + 1) {
335 ret = fnmatch(p, name, pmd->fnmatch_flags);
336 if (ret == FNM_NOMATCH)
340 return pmd->action(pmd->table, row, name, pmd->data);
346 * Execute the given function for each matching row.
348 * \param pmd Describes what to match and how.
350 * \return The return value of the underlying call to osl_rbtree_loop()
351 * or osl_rbtree_loop_reverse().
353 int for_each_matching_row(struct pattern_match_data *pmd)
355 if (pmd->pm_flags & PM_REVERSE_LOOP)
356 return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
357 action_if_pattern_matches);
358 return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
359 action_if_pattern_matches);
363 * Compare two osl objects of string type.
365 * \param obj1 Pointer to the first object.
366 * \param obj2 Pointer to the second object.
368 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
369 * are taken into account.
371 * \return It returns an integer less than, equal to, or greater than zero if
372 * \a obj1 is found, respectively, to be less than, to match, or be greater than
375 * \sa strcmp(3), strncmp(3), osl_compare_func.
377 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
379 const char *str1 = (const char *)obj1->data;
380 const char *str2 = (const char *)obj2->data;
381 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
385 * write input from fd to dynamically allocated buffer,
386 * but maximal max_size byte.
388 static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
390 const size_t chunk_size = 1024;
391 size_t size = 2048, received = 0;
393 char *buf = para_malloc(size);
396 ret = recv_bin_buffer(fd, buf + received, chunk_size);
400 if (received + chunk_size >= size) {
402 ret = -E_INPUT_TOO_LARGE;
405 buf = para_realloc(buf, size);
409 obj->size = received;
416 * Read data from a file descriptor, and send it to the afs process.
418 * \param fd File descriptor to read data from.
419 * \param arg_obj Pointer to the arguments to \a f.
420 * \param f The callback function.
421 * \param max_len Don't read more than that many bytes from stdin.
422 * \param result_handler See \ref send_callback_request.
423 * \param private_result_data See \ref send_callback_request.
425 * This function is used by commands that wish to let para_server store
426 * arbitrary data specified by the user (for instance the add_blob family of
427 * commands). First, at most \a max_len bytes are read from \a fd, the result
428 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
429 * is made available to the afs process via the callback method. See \ref
430 * send_callback_request for details.
432 * \return Negative on errors, the return value of the underlying call to
433 * send_callback_request() otherwise.
435 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
436 unsigned max_len, callback_result_handler *result_handler,
437 void *private_result_data)
439 struct osl_object query, stdin_obj;
442 ret = send_buffer(fd, AWAITING_DATA_MSG);
445 ret = fd2buf(fd, max_len, &stdin_obj);
448 query.size = arg_obj->size + stdin_obj.size;
449 query.data = para_malloc(query.size);
450 memcpy(query.data, arg_obj->data, arg_obj->size);
451 memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
452 free(stdin_obj.data);
453 ret = send_callback_request(f, &query, result_handler, private_result_data);
458 static int pass_afd(int fd, char *buf, size_t size)
460 struct msghdr msg = {.msg_iov = NULL};
461 struct cmsghdr *cmsg;
472 msg.msg_control = control;
473 msg.msg_controllen = sizeof(control);
475 cmsg = CMSG_FIRSTHDR(&msg);
476 cmsg->cmsg_level = SOL_SOCKET;
477 cmsg->cmsg_type = SCM_RIGHTS;
478 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
479 *(int *)CMSG_DATA(cmsg) = fd;
481 /* Sum of the length of all control messages in the buffer */
482 msg.msg_controllen = cmsg->cmsg_len;
483 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
484 ret = sendmsg(server_socket, &msg, 0);
486 ret = -ERRNO_TO_PARA_ERROR(errno);
493 * Open the audio file with highest score.
495 * This stores all information for streaming the "best" audio file in a shared
496 * memory area. The id of that area and an open file descriptor for the next
497 * audio file are passed to the server process.
501 * \sa open_and_update_audio_file().
503 static int open_next_audio_file(void)
505 struct osl_row *aft_row;
506 struct audio_file_data afd;
511 PARA_NOTICE_LOG("getting next audio file\n");
512 ret = score_get_best(&aft_row, &score);
514 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
515 goto no_admissible_files;
517 ret = open_and_update_audio_file(aft_row, score, &afd);
519 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
520 ret = score_delete(aft_row);
522 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
523 goto no_admissible_files;
528 if (!write_ok(server_socket)) {
532 *(uint32_t *)buf = NEXT_AUDIO_FILE;
533 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
534 ret = pass_afd(afd.fd, buf, 8);
542 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
543 *(uint32_t *)(buf + 4) = (uint32_t)0;
544 return send_bin_buffer(server_socket, buf, 8);
547 /* Never fails if arg == NULL */
548 static int activate_mood_or_playlist(char *arg, int *num_admissible)
554 ret = change_current_mood(NULL); /* always successful */
555 mode = PLAY_MODE_MOOD;
557 if (!strncmp(arg, "p/", 2)) {
558 ret = playlist_open(arg + 2);
559 mode = PLAY_MODE_PLAYLIST;
560 } else if (!strncmp(arg, "m/", 2)) {
561 ret = change_current_mood(arg + 2);
562 mode = PLAY_MODE_MOOD;
564 return -E_AFS_SYNTAX;
569 *num_admissible = ret;
570 current_play_mode = mode;
571 if (arg != current_mop) {
574 current_mop = para_strdup(arg);
575 mutex_lock(mmd_mutex);
576 strncpy(mmd->afs_mode_string, arg,
577 sizeof(mmd->afs_mode_string));
578 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
579 mutex_unlock(mmd_mutex);
581 mutex_lock(mmd_mutex);
582 strcpy(mmd->afs_mode_string, "dummy");
583 mutex_unlock(mmd_mutex);
590 static void com_select_callback(int fd, const struct osl_object *query)
592 struct para_buffer pb = {
595 .max_size_handler = pass_buffer_as_shm
597 char *arg = query->data;
598 int num_admissible, ret, ret2;
600 ret = clear_score_table();
602 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
605 if (current_play_mode == PLAY_MODE_MOOD)
606 close_current_mood();
609 ret = activate_mood_or_playlist(arg, &num_admissible);
611 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
612 para_strerror(-ret), current_mop?
613 current_mop : "dummy");
614 ret = activate_mood_or_playlist(current_mop, &num_admissible);
617 ret2 = para_printf(&pb, "failed, switching to dummy\n");
618 activate_mood_or_playlist(NULL, &num_admissible);
621 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
622 current_mop : "dummy mood", num_admissible);
624 if (ret2 >= 0 && pb.offset)
625 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
630 * Result handler for sending data to the para_client process.
632 * \param result The data to be sent.
633 * \param fd_ptr Pointer to the file descriptor.
635 * \return The return value of the underlying call to send_bin_buffer().
637 * \sa \ref callback_result_handler.
639 int send_result(struct osl_object *result, void *fd_ptr)
641 int fd = *(int *)fd_ptr;
644 return send_bin_buffer(fd, result->data, result->size);
647 int com_select(int fd, int argc, char * const * const argv)
649 struct osl_object query;
652 return -E_AFS_SYNTAX;
653 query.data = argv[1];
654 query.size = strlen(argv[1]) + 1;
655 return send_callback_request(com_select_callback, &query,
659 static void init_admissible_files(char *arg)
661 if (activate_mood_or_playlist(arg, NULL) < 0)
662 activate_mood_or_playlist(NULL, NULL); /* always successful */
665 static int setup_command_socket_or_die(void)
668 char *socket_name = conf.afs_socket_arg;
669 struct sockaddr_un unix_addr;
672 ret = create_local_socket(socket_name, &unix_addr,
673 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
675 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
679 if (listen(socket_fd , 5) < 0) {
680 PARA_EMERG_LOG("can not listen on socket\n");
683 ret = mark_fd_nonblocking(socket_fd);
688 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
693 static void close_afs_tables(void)
696 PARA_NOTICE_LOG("closing afs_tables\n");
697 for (i = 0; i < NUM_AFS_TABLES; i++)
698 afs_tables[i].close();
701 static char *database_dir;
703 static void get_database_dir(void)
706 if (conf.afs_database_dir_given)
707 database_dir = para_strdup(conf.afs_database_dir_arg);
709 char *home = para_homedir();
710 database_dir = make_message(
711 "%s/.paraslash/afs_database", home);
715 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
718 static int make_database_dir(void)
723 ret = para_mkdir(database_dir, 0777);
724 if (ret >= 0 || is_errno(-ret, EEXIST))
729 static int open_afs_tables(void)
734 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
736 for (i = 0; i < NUM_AFS_TABLES; i++) {
737 ret = afs_tables[i].open(database_dir);
740 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
741 para_strerror(-ret));
747 afs_tables[--i].close();
751 static void signal_pre_select(struct sched *s, struct task *t)
753 struct signal_task *st = container_of(t, struct signal_task, task);
754 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
757 static void signal_post_select(struct sched *s, struct task *t)
759 struct signal_task *st = container_of(t, struct signal_task, task);
760 if (getppid() == 1) {
761 PARA_EMERG_LOG("para_server died\n");
764 if (!FD_ISSET(st->fd, &s->rfds))
766 st->signum = para_next_signal();
767 if (st->signum == SIGHUP) {
769 t->error = open_afs_tables();
772 init_admissible_files(current_mop);
775 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
778 t->error = -E_AFS_SIGNAL;
781 static void register_signal_task(void)
783 struct signal_task *st = &signal_task_struct;
785 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
786 PARA_EMERG_LOG("failed to ignore SIGPIPE\n");
789 if (signal(SIGUSR1, SIG_IGN) == SIG_ERR) {
790 PARA_EMERG_LOG("failed to ignore SIGUSR1\n");
793 st->fd = para_signal_init();
794 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
795 para_install_sighandler(SIGINT);
796 para_install_sighandler(SIGTERM);
797 para_install_sighandler(SIGHUP);
799 st->task.pre_select = signal_pre_select;
800 st->task.post_select = signal_post_select;
801 sprintf(st->task.status, "signal task");
802 register_task(&st->task);
805 static struct list_head afs_client_list;
807 /** Describes on connected afs client. */
809 /** Position in the afs client list. */
810 struct list_head node;
811 /** The socket file descriptor for this client. */
813 /** The time the client connected. */
814 struct timeval connect_time;
817 static void command_pre_select(struct sched *s, struct task *t)
819 struct command_task *ct = container_of(t, struct command_task, task);
820 struct afs_client *client;
822 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
823 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
824 list_for_each_entry(client, &afs_client_list, node)
825 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
829 * Send data as shared memory to a file descriptor.
831 * \param buf The buffer holding the data to be sent.
832 * \param size The size of \a buf.
833 * \param fd_ptr A pointer to the file descriptor.
835 * This function is used as the \a max_size handler in a \ref para_buffer
836 * structure. If used this way, it is called by \ref para_printf() whenever
837 * the buffer passed to para_printf() is about to exceed its maximal size.
839 * This function creates a shared memory area large enough to hold
840 * the content given by \a buf and \a size and sends the identifier
841 * of this area to the file descriptor given by \a fd_ptr.
843 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
844 * and positive on success.
846 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
848 int ret, shmid, fd = *(int *)fd_ptr;
850 struct callback_result *cr;
854 ret = shm_new(size + sizeof(struct callback_result));
858 ret = shm_attach(shmid, ATTACH_RW, &shm);
862 cr->result_size = size;
863 memcpy(shm + sizeof(*cr), buf, size);
864 ret = shm_detach(shm);
867 ret = send_bin_buffer(fd, (char *)&shmid, sizeof(int));
871 if (shm_destroy(shmid) < 0)
872 PARA_ERROR_LOG("destroy result failed\n");
877 * On errors, negative value is written to fd.
878 * On success: If query produced a result, the result_shmid is written to fd.
879 * Otherwise, zero is written.
881 static int call_callback(int fd, int query_shmid)
884 struct callback_query *cq;
885 struct osl_object query;
888 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
892 query.data = (char *)query_shm + sizeof(*cq);
893 query.size = cq->query_size;
894 cq->handler(fd, &query);
898 static int execute_server_command(void)
901 int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1);
905 ret = -ERRNO_TO_PARA_ERROR(ECONNRESET);
909 PARA_DEBUG_LOG("received: %s\n", buf);
911 if (strcmp(buf, "new"))
913 ret = open_next_audio_file();
918 static void execute_afs_command(int fd, uint32_t expected_cookie)
922 char buf[sizeof(cookie) + sizeof(query_shmid)];
923 int ret = recv_bin_buffer(fd, buf, sizeof(buf));
927 if (ret != sizeof(buf)) {
928 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
929 ret, (long unsigned) sizeof(buf));
932 cookie = *(uint32_t *)buf;
933 if (cookie != expected_cookie) {
934 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
935 (unsigned)cookie, (unsigned)expected_cookie);
938 query_shmid = *(int *)(buf + sizeof(cookie));
939 if (query_shmid < 0) {
940 PARA_WARNING_LOG("received invalid query shmid %d)\n",
944 ret = call_callback(fd, query_shmid);
948 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
951 /** Shutdown connection if query has not arrived until this many seconds. */
952 #define AFS_CLIENT_TIMEOUT 3
954 static void command_post_select(struct sched *s, struct task *t)
956 struct command_task *ct = container_of(t, struct command_task, task);
957 struct sockaddr_un unix_addr;
958 struct afs_client *client, *tmp;
961 if (FD_ISSET(server_socket, &s->rfds)) {
962 ret = execute_server_command();
964 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
970 /* Check the list of connected clients. */
971 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
972 if (FD_ISSET(client->fd, &s->rfds))
973 execute_afs_command(client->fd, ct->cookie);
974 else { /* prevent bogus connection flooding */
976 tv_diff(now, &client->connect_time, &diff);
977 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
979 PARA_WARNING_LOG("connection timeout\n");
982 list_del(&client->node);
985 /* Accept connections on the local socket. */
986 if (!FD_ISSET(ct->fd, &s->rfds))
988 ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
990 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
994 ret = mark_fd_nonblocking(fd);
996 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1000 client = para_malloc(sizeof(*client));
1002 client->connect_time = *now;
1003 para_list_add(&client->node, &afs_client_list);
1006 static void register_command_task(uint32_t cookie)
1008 struct command_task *ct = &command_task_struct;
1009 ct->fd = setup_command_socket_or_die();
1010 ct->cookie = cookie;
1012 ct->task.pre_select = command_pre_select;
1013 ct->task.post_select = command_post_select;
1014 sprintf(ct->task.status, "command task");
1015 register_task(&ct->task);
1019 * Initialize the audio file selector process.
1021 * \param cookie The value used for "authentication".
1022 * \param socket_fd File descriptor used for communication with the server.
1024 __noreturn void afs_init(uint32_t cookie, int socket_fd)
1026 static struct sched s;
1029 register_signal_task();
1030 INIT_LIST_HEAD(&afs_client_list);
1031 for (i = 0; i < NUM_AFS_TABLES; i++)
1032 afs_tables[i].init(&afs_tables[i]);
1033 ret = open_afs_tables();
1036 server_socket = socket_fd;
1037 ret = mark_fd_nonblocking(server_socket);
1040 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1041 server_socket, (unsigned) cookie);
1042 init_admissible_files(conf.afs_initial_mode_arg);
1043 register_command_task(cookie);
1044 s.default_timeout.tv_sec = 0;
1045 s.default_timeout.tv_usec = 999 * 1000;
1051 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1055 static void create_tables_callback(int fd, const struct osl_object *query)
1057 uint32_t table_mask = *(uint32_t *)query->data;
1062 for (i = 0; i < NUM_AFS_TABLES; i++) {
1063 struct afs_table *t = &afs_tables[i];
1065 if (!(table_mask & (1 << i)))
1069 ret = t->create(database_dir);
1073 ret = open_afs_tables();
1076 buf = make_message("successfully created afs table(s)\n");
1078 buf = make_message("%s\n", para_strerror(-ret));
1079 pass_buffer_as_shm(buf, strlen(buf), &fd);
1083 int com_init(int fd, int argc, char * const * const argv)
1086 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1087 struct osl_object query = {.data = &table_mask,
1088 .size = sizeof(table_mask)};
1090 ret = make_database_dir();
1095 for (i = 1; i < argc; i++) {
1096 for (j = 0; j < NUM_AFS_TABLES; j++) {
1097 struct afs_table *t = &afs_tables[j];
1099 if (strcmp(argv[i], t->name))
1101 table_mask |= (1 << j);
1104 if (j == NUM_AFS_TABLES)
1105 return -E_BAD_TABLE_NAME;
1108 ret = send_callback_request(create_tables_callback, &query, &send_result, &fd);
1110 return send_va_buffer(fd, "%s\n", para_strerror(-ret));
1115 * Flags for the check command.
1119 enum com_check_flags {
1120 /** Check the audio file table. */
1122 /** Check the mood table. */
1124 /** Check the playlist table. */
1128 int com_check(int fd, int argc, char * const * const argv)
1133 for (i = 1; i < argc; i++) {
1134 const char *arg = argv[i];
1137 if (!strcmp(arg, "--")) {
1141 if (!strcmp(arg, "-a")) {
1145 if (!strcmp(arg, "-p")) {
1146 flags |= CHECK_PLAYLISTS;
1149 if (!strcmp(arg, "-m")) {
1150 flags |= CHECK_MOODS;
1153 return -E_AFS_SYNTAX;
1156 return -E_AFS_SYNTAX;
1159 if (flags & CHECK_AFT) {
1160 ret = send_callback_request(aft_check_callback, NULL, send_result, &fd);
1164 if (flags & CHECK_PLAYLISTS) {
1165 ret = send_callback_request(playlist_check_callback, NULL, send_result, &fd);
1169 if (flags & CHECK_MOODS) {
1170 ret = send_callback_request(mood_check_callback, NULL, send_result, &fd);
1177 void afs_event(enum afs_events event, struct para_buffer *pb,
1182 for (i = 0; i < NUM_AFS_TABLES; i++) {
1183 struct afs_table *t = &afs_tables[i];
1184 if (!t->event_handler)
1186 ret = t->event_handler(event, pb, data);
1188 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1189 event, para_strerror(-ret));
1193 int images_event_handler(__a_unused enum afs_events event,
1194 __a_unused struct para_buffer *pb, __a_unused void *data)
1199 int lyrics_event_handler(__a_unused enum afs_events event,
1200 __a_unused struct para_buffer *pb, __a_unused void *data)