2 * Copyright (C) 2007-2012 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. */
14 #include "server.cmdline.h"
32 /** The osl tables used by afs. \sa blob.c. */
34 /** Contains audio file information. See aft.c. */
36 /** The table for the paraslash attributes. See attribute.c. */
39 * Paraslash's scoring system is based on Gaussian normal
40 * distributions, and the relevant data is stored in the rbtrees of an
41 * osl table containing only volatile columns. See score.c for
46 * A standard blob table containing the mood definitions. For details
50 /** A blob table containing lyrics on a per-song basis. */
52 /** Another blob table for images (for example album cover art). */
54 /** Yet another blob table for storing standard playlists. */
56 /** How many tables are in use? */
60 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
61 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
62 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
63 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
64 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
65 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
66 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
67 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
71 /** The file descriptor for the local socket. */
74 * Value sent by the command handlers to identify themselves as
75 * children of the running para_server.
78 /** The associated task structure. */
83 extern struct misc_meta_data *mmd;
85 static int server_socket;
86 static struct command_task command_task_struct;
87 static struct signal_task signal_task_struct;
89 static enum play_mode current_play_mode;
90 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
93 * A random number used to "authenticate" the connection.
95 * para_server picks this number by random before forking the afs process. The
96 * command handlers write this number together with the id of the shared memory
97 * area containing the query. This way, a malicious local user has to know this
98 * number to be able to cause the afs process to crash by sending fake queries.
100 extern uint32_t afs_socket_cookie;
103 * Struct to let command handlers execute a callback in afs context.
105 * Commands that need to change the state of afs can't change the relevant data
106 * structures directly because commands are executed in a child process, i.e.
107 * they get their own virtual address space.
109 * This structure is used by \p send_callback_request() (executed from handler
110 * context) in order to let the afs process call the specified function. An
111 * instance of that structure is written to a shared memory area together with
112 * the arguments to the callback function. The identifier of the shared memory
113 * area is written to the command socket.
115 * The afs process accepts connections on the command socket and reads the
116 * shared memory id, attaches the corresponing area, calls the given handler to
117 * perform the desired action and to optionally compute a result.
119 * The result and a \p callback_result structure is then written to another
120 * shared memory area. The identifier for that area is written to the handler's
121 * command socket, so that the handler process can read the id, attach the
122 * shared memory area and use the result.
124 * \sa struct callback_result.
126 struct callback_query {
127 /** The function to be called. */
128 callback_function *handler;
129 /** The number of bytes of the query */
134 * Structure embedded in the result of a callback.
136 * If the callback produced a result, an instance of that structure is embeeded
137 * into the shared memory area holding the result, mainly to let the command
138 * handler know the size of the result.
140 * \sa struct callback_query.
142 struct callback_result {
143 /** The number of bytes of the result. */
145 /** The band designator (loglevel for the result). */
149 static int dispatch_result(int result_shmid, callback_result_handler *handler,
150 void *private_result_data)
152 struct osl_object result;
154 /* must attach r/w as result.data might get encrypted in-place. */
155 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
156 struct callback_result *cr = result_shm;
159 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
162 result.size = cr->result_size;
163 result.data = result_shm + sizeof(*cr);
166 ret = handler(&result, cr->band, private_result_data);
168 PARA_NOTICE_LOG("result handler error: %s\n",
169 para_strerror(-ret));
171 ret2 = shm_detach(result_shm);
173 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
181 * Ask the afs process to call a given function.
183 * \param f The function to be called.
184 * \param query Pointer to arbitrary data for the callback.
185 * \param result_handler Called for each shm area sent by the callback.
186 * \param private_result_data Passed verbatim to \a result_handler.
188 * This function creates a socket for communication with the afs process and a
189 * shared memory area (sma) to which the buffer pointed to by \a query is
190 * copied. It then notifies the afs process that the callback function \a f
191 * should be executed by sending the shared memory identifier (shmid) to the
194 * If the callback produces a result, it sends any number of shared memory
195 * identifiers back via the socket. For each such identifier received, \a
196 * result_handler is called. The contents of the sma identified by the received
197 * shmid are passed to that function as an osl object. The private_result_data
198 * pointer is passed as the second argument to \a result_handler.
200 * \return Number of shared memory areas dispatched on success, negative on errors.
202 * \sa send_option_arg_callback_request(), send_standard_callback_request().
204 int send_callback_request(callback_function *f, struct osl_object *query,
205 callback_result_handler *result_handler,
206 void *private_result_data)
208 struct callback_query *cq;
209 int ret, fd = -1, query_shmid, result_shmid;
211 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
212 size_t query_shm_size = sizeof(*cq);
213 int dispatch_error = 0, num_dispatched = 0;
216 query_shm_size += query->size;
217 ret = shm_new(query_shm_size);
221 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
226 cq->query_size = query_shm_size - sizeof(*cq);
229 memcpy(query_shm + sizeof(*cq), query->data, query->size);
230 ret = shm_detach(query_shm);
234 *(uint32_t *) buf = afs_socket_cookie;
235 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
237 ret = connect_local_socket(conf.afs_socket_arg);
241 ret = write_all(fd, buf, sizeof(buf));
245 * Read all shmids from afs.
247 * Even if the dispatcher returns an error we _must_ continue to read
248 * shmids from fd so that we can destroy all shared memory areas that
249 * have been created for us by the afs process.
252 ret = recv_bin_buffer(fd, buf, sizeof(int));
255 assert(ret == sizeof(int));
259 if (!dispatch_error) {
260 ret = dispatch_result(result_shmid, result_handler,
261 private_result_data);
265 ret = shm_destroy(result_shmid);
267 PARA_CRIT_LOG("destroy result failed: %s\n",
268 para_strerror(-ret));
272 if (shm_destroy(query_shmid) < 0)
273 PARA_CRIT_LOG("shm destroy error\n");
276 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
277 return ret < 0? ret : num_dispatched;
281 * Send a callback request passing an options structure and an argument vector.
283 * \param options pointer to an arbitrary data structure.
284 * \param argc Argument count.
285 * \param argv Standard argument vector.
286 * \param f The callback function.
287 * \param result_handler See \ref send_callback_request.
288 * \param private_result_data See \ref send_callback_request.
290 * Some commands have a couple of options that are parsed in child context for
291 * syntactic correctness and are stored in a special options structure for that
292 * command. This function allows to pass such a structure together with a list
293 * of further arguments (often a list of audio files) to the parent process.
295 * \return The return value of the underlying call to \ref
296 * send_callback_request().
298 * \sa send_standard_callback_request(), send_callback_request().
300 int send_option_arg_callback_request(struct osl_object *options,
301 int argc, char * const * const argv, callback_function *f,
302 callback_result_handler *result_handler,
303 void *private_result_data)
307 struct osl_object query = {.size = options? options->size : 0};
309 for (i = 0; i < argc; i++)
310 query.size += strlen(argv[i]) + 1;
311 query.data = para_malloc(query.size);
314 memcpy(query.data, options->data, options->size);
317 for (i = 0; i < argc; i++) {
318 strcpy(p, argv[i]); /* OK */
319 p += strlen(argv[i]) + 1;
321 ret = send_callback_request(f, &query, result_handler,
322 private_result_data);
328 * Send a callback request with an argument vector only.
330 * \param argc The same meaning as in send_option_arg_callback_request().
331 * \param argv The same meaning as in send_option_arg_callback_request().
332 * \param f The same meaning as in send_option_arg_callback_request().
333 * \param result_handler See \ref send_callback_request.
334 * \param private_result_data See \ref send_callback_request.
336 * This is similar to send_option_arg_callback_request(), but no options buffer
337 * is passed to the parent process.
339 * \return The return value of the underlying call to
340 * send_option_arg_callback_request().
342 int send_standard_callback_request(int argc, char * const * const argv,
343 callback_function *f, callback_result_handler *result_handler,
344 void *private_result_data)
346 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
347 private_result_data);
350 static int action_if_pattern_matches(struct osl_row *row, void *data)
352 struct pattern_match_data *pmd = data;
353 struct osl_object name_obj;
354 const char *p, *name;
355 int ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj));
356 const char *pattern_txt = (const char *)pmd->patterns.data;
360 name = (char *)name_obj.data;
361 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
363 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
364 return pmd->action(pmd->table, row, name, pmd->data);
365 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
366 p += strlen(p) + 1) {
367 ret = fnmatch(p, name, pmd->fnmatch_flags);
368 if (ret == FNM_NOMATCH)
372 ret = pmd->action(pmd->table, row, name, pmd->data);
381 * Execute the given function for each matching row.
383 * \param pmd Describes what to match and how.
387 int for_each_matching_row(struct pattern_match_data *pmd)
389 if (pmd->pm_flags & PM_REVERSE_LOOP)
390 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
391 action_if_pattern_matches));
392 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
393 action_if_pattern_matches));
397 * Compare two osl objects of string type.
399 * \param obj1 Pointer to the first object.
400 * \param obj2 Pointer to the second object.
402 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
403 * are taken into account.
405 * \return It returns an integer less than, equal to, or greater than zero if
406 * \a obj1 is found, respectively, to be less than, to match, or be greater than
409 * \sa strcmp(3), strncmp(3), osl_compare_func.
411 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
413 const char *str1 = (const char *)obj1->data;
414 const char *str2 = (const char *)obj2->data;
415 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
418 static int pass_afd(int fd, char *buf, size_t size)
420 struct msghdr msg = {.msg_iov = NULL};
421 struct cmsghdr *cmsg;
432 msg.msg_control = control;
433 msg.msg_controllen = sizeof(control);
435 cmsg = CMSG_FIRSTHDR(&msg);
436 cmsg->cmsg_level = SOL_SOCKET;
437 cmsg->cmsg_type = SCM_RIGHTS;
438 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
439 *(int *)CMSG_DATA(cmsg) = fd;
441 /* Sum of the length of all control messages in the buffer */
442 msg.msg_controllen = cmsg->cmsg_len;
443 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
444 ret = sendmsg(server_socket, &msg, 0);
446 ret = -ERRNO_TO_PARA_ERROR(errno);
453 * Open the audio file with highest score.
455 * This stores all information for streaming the "best" audio file in a shared
456 * memory area. The id of that area and an open file descriptor for the next
457 * audio file are passed to the server process.
461 * \sa open_and_update_audio_file().
463 static int open_next_audio_file(void)
465 struct osl_row *aft_row;
466 struct audio_file_data afd;
471 PARA_NOTICE_LOG("getting next audio file\n");
472 ret = score_get_best(&aft_row, &score);
474 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
475 goto no_admissible_files;
477 ret = open_and_update_audio_file(aft_row, score, &afd);
479 ret = score_delete(aft_row);
481 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
482 goto no_admissible_files;
487 if (!write_ok(server_socket)) {
491 *(uint32_t *)buf = NEXT_AUDIO_FILE;
492 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
493 ret = pass_afd(afd.fd, buf, 8);
501 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
502 *(uint32_t *)(buf + 4) = (uint32_t)0;
503 return write_all(server_socket, buf, 8);
506 /* Never fails if arg == NULL */
507 static int activate_mood_or_playlist(char *arg, int *num_admissible)
513 ret = change_current_mood(NULL); /* always successful */
514 mode = PLAY_MODE_MOOD;
516 if (!strncmp(arg, "p/", 2)) {
517 ret = playlist_open(arg + 2);
518 mode = PLAY_MODE_PLAYLIST;
519 } else if (!strncmp(arg, "m/", 2)) {
520 ret = change_current_mood(arg + 2);
521 mode = PLAY_MODE_MOOD;
523 return -E_AFS_SYNTAX;
528 *num_admissible = ret;
529 current_play_mode = mode;
530 if (arg != current_mop) {
533 current_mop = para_strdup(arg);
534 mutex_lock(mmd_mutex);
535 strncpy(mmd->afs_mode_string, arg,
536 sizeof(mmd->afs_mode_string));
537 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
538 mutex_unlock(mmd_mutex);
540 mutex_lock(mmd_mutex);
541 strcpy(mmd->afs_mode_string, "dummy");
542 mutex_unlock(mmd_mutex);
549 static void com_select_callback(int fd, const struct osl_object *query)
551 struct para_buffer pb = {
552 .max_size = shm_get_shmmax(),
553 .private_data = &(struct afs_max_size_handler_data) {
557 .max_size_handler = afs_max_size_handler,
559 char *arg = query->data;
560 int num_admissible, ret, ret2;
562 ret = clear_score_table();
564 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
567 if (current_play_mode == PLAY_MODE_MOOD)
568 close_current_mood();
571 ret = activate_mood_or_playlist(arg, &num_admissible);
573 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
574 para_strerror(-ret), current_mop?
575 current_mop : "dummy");
576 ret = activate_mood_or_playlist(current_mop, &num_admissible);
579 ret2 = para_printf(&pb, "failed, switching to dummy\n");
580 activate_mood_or_playlist(NULL, &num_admissible);
583 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
584 current_mop : "dummy mood", num_admissible);
586 if (ret2 >= 0 && pb.offset)
587 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
592 * Result handler for sending data to the para_client process.
594 * \param result The data to be sent.
595 * \param band The band designator.
596 * \param private Pointer to the command context.
598 * \return The return value of the underlying call to \ref command.c::send_sb.
600 * \sa \ref callback_result_handler, \ref command.c::send_sb.
602 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
605 struct command_context *cc = private;
609 if (cc->use_sideband)
610 return send_sb(&cc->scc, result->data, result->size, band,
612 return sc_send_bin_buffer(&cc->scc, result->data, result->size);
615 int com_select(struct command_context *cc)
617 struct osl_object query;
620 return -E_AFS_SYNTAX;
621 query.data = cc->argv[1];
622 query.size = strlen(cc->argv[1]) + 1;
623 return send_callback_request(com_select_callback, &query,
624 &afs_cb_result_handler, cc);
627 static void init_admissible_files(char *arg)
629 if (activate_mood_or_playlist(arg, NULL) < 0)
630 activate_mood_or_playlist(NULL, NULL); /* always successful */
633 static int setup_command_socket_or_die(void)
636 char *socket_name = conf.afs_socket_arg;
637 struct sockaddr_un unix_addr;
640 ret = create_local_socket(socket_name, &unix_addr,
641 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
643 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
647 if (listen(socket_fd , 5) < 0) {
648 PARA_EMERG_LOG("can not listen on socket\n");
651 ret = mark_fd_nonblocking(socket_fd);
656 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
661 static void close_afs_tables(void)
664 PARA_NOTICE_LOG("closing afs_tables\n");
665 for (i = 0; i < NUM_AFS_TABLES; i++)
666 afs_tables[i].close();
669 static char *database_dir;
671 static void get_database_dir(void)
674 if (conf.afs_database_dir_given)
675 database_dir = para_strdup(conf.afs_database_dir_arg);
677 char *home = para_homedir();
678 database_dir = make_message(
679 "%s/.paraslash/afs_database-0.4", home);
683 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
686 static int make_database_dir(void)
691 ret = para_mkdir(database_dir, 0777);
692 if (ret >= 0 || is_errno(-ret, EEXIST))
697 static int open_afs_tables(void)
702 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
704 for (i = 0; i < NUM_AFS_TABLES; i++) {
705 ret = afs_tables[i].open(database_dir);
708 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
709 para_strerror(-ret));
715 afs_tables[--i].close();
719 static void signal_pre_select(struct sched *s, struct task *t)
721 struct signal_task *st = container_of(t, struct signal_task, task);
722 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
725 static void afs_signal_post_select(struct sched *s, struct task *t)
729 if (getppid() == 1) {
730 PARA_EMERG_LOG("para_server died\n");
733 signum = para_next_signal(&s->rfds);
736 if (signum == SIGHUP) {
738 parse_config_or_die(1);
739 t->error = open_afs_tables();
742 init_admissible_files(current_mop);
745 PARA_EMERG_LOG("terminating on signal %d\n", signum);
748 t->error = -E_AFS_SIGNAL;
751 static void register_signal_task(struct sched *s)
753 struct signal_task *st = &signal_task_struct;
755 para_sigaction(SIGPIPE, SIG_IGN);
756 st->fd = para_signal_init();
757 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
758 para_install_sighandler(SIGINT);
759 para_install_sighandler(SIGTERM);
760 para_install_sighandler(SIGHUP);
762 st->task.pre_select = signal_pre_select;
763 st->task.post_select = afs_signal_post_select;
764 sprintf(st->task.status, "signal task");
765 register_task(s, &st->task);
768 static struct list_head afs_client_list;
770 /** Describes on connected afs client. */
772 /** Position in the afs client list. */
773 struct list_head node;
774 /** The socket file descriptor for this client. */
776 /** The time the client connected. */
777 struct timeval connect_time;
780 static void command_pre_select(struct sched *s, struct task *t)
782 struct command_task *ct = container_of(t, struct command_task, task);
783 struct afs_client *client;
785 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
786 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
787 list_for_each_entry(client, &afs_client_list, node)
788 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
792 * Send data as shared memory to a file descriptor.
794 * \param fd File descriptor to send the shmid to.
795 * \param band The band designator for this data.
796 * \param buf The buffer holding the data to be sent.
797 * \param size The size of \a buf.
799 * This function creates a shared memory area large enough to hold
800 * the content given by \a buf and \a size and sends the identifier
801 * of this area to the file descriptor given by \a fd_ptr.
803 * It is called by the AFS max_size handler as well as directly by the AFS
804 * command callbacks to send command output to the command handlers.
806 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
807 * and positive on success.
809 int pass_buffer_as_shm(int fd, uint8_t band, char *buf, size_t size)
813 struct callback_result *cr;
817 ret = shm_new(size + sizeof(*cr));
821 ret = shm_attach(shmid, ATTACH_RW, &shm);
825 cr->result_size = size;
827 memcpy(shm + sizeof(*cr), buf, size);
828 ret = shm_detach(shm);
831 ret = write_all(fd, (char *)&shmid, sizeof(int));
835 if (shm_destroy(shmid) < 0)
836 PARA_ERROR_LOG("destroy result failed\n");
841 * On errors, negative value is written to fd.
842 * On success: If query produced a result, the result_shmid is written to fd.
843 * Otherwise, zero is written.
845 static int call_callback(int fd, int query_shmid)
848 struct callback_query *cq;
849 struct osl_object query;
852 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
856 query.data = (char *)query_shm + sizeof(*cq);
857 query.size = cq->query_size;
858 cq->handler(fd, &query);
859 return shm_detach(query_shm);
862 static int execute_server_command(fd_set *rfds)
866 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
868 if (ret < 0 || n == 0)
871 if (strcmp(buf, "new"))
873 return open_next_audio_file();
876 /* returns 0 if no data available, 1 else */
877 static int execute_afs_command(int fd, fd_set *rfds, uint32_t expected_cookie)
881 char buf[sizeof(cookie) + sizeof(query_shmid)];
883 int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
889 if (n != sizeof(buf)) {
890 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
891 ret, (long unsigned) sizeof(buf));
894 cookie = *(uint32_t *)buf;
895 if (cookie != expected_cookie) {
896 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
897 (unsigned)cookie, (unsigned)expected_cookie);
900 query_shmid = *(int *)(buf + sizeof(cookie));
901 if (query_shmid < 0) {
902 PARA_WARNING_LOG("received invalid query shmid %d)\n",
906 ret = call_callback(fd, query_shmid);
910 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
914 /** Shutdown connection if query has not arrived until this many seconds. */
915 #define AFS_CLIENT_TIMEOUT 3
917 static void command_post_select(struct sched *s, struct task *t)
919 struct command_task *ct = container_of(t, struct command_task, task);
920 struct sockaddr_un unix_addr;
921 struct afs_client *client, *tmp;
924 ret = execute_server_command(&s->rfds);
926 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
930 /* Check the list of connected clients. */
931 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
932 ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
933 if (ret == 0) { /* prevent bogus connection flooding */
935 tv_diff(now, &client->connect_time, &diff);
936 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
938 PARA_WARNING_LOG("connection timeout\n");
941 list_del(&client->node);
944 /* Accept connections on the local socket. */
945 ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
947 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
950 ret = mark_fd_nonblocking(fd);
952 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
956 client = para_malloc(sizeof(*client));
958 client->connect_time = *now;
959 para_list_add(&client->node, &afs_client_list);
962 static void register_command_task(uint32_t cookie, struct sched *s)
964 struct command_task *ct = &command_task_struct;
965 ct->fd = setup_command_socket_or_die();
968 ct->task.pre_select = command_pre_select;
969 ct->task.post_select = command_post_select;
970 sprintf(ct->task.status, "afs command task");
971 register_task(s, &ct->task);
975 * Initialize the audio file selector process.
977 * \param cookie The value used for "authentication".
978 * \param socket_fd File descriptor used for communication with the server.
980 __noreturn void afs_init(uint32_t cookie, int socket_fd)
982 static struct sched s;
985 register_signal_task(&s);
986 INIT_LIST_HEAD(&afs_client_list);
987 for (i = 0; i < NUM_AFS_TABLES; i++)
988 afs_tables[i].init(&afs_tables[i]);
989 ret = open_afs_tables();
992 server_socket = socket_fd;
993 ret = mark_fd_nonblocking(server_socket);
996 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
997 server_socket, (unsigned) cookie);
998 init_admissible_files(conf.afs_initial_mode_arg);
999 register_command_task(cookie, &s);
1000 s.default_timeout.tv_sec = 0;
1001 s.default_timeout.tv_usec = 999 * 1000;
1007 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1011 static void create_tables_callback(int fd, const struct osl_object *query)
1013 uint32_t table_mask = *(uint32_t *)query->data;
1015 struct para_buffer pb = {.buf = NULL};
1018 for (i = 0; i < NUM_AFS_TABLES; i++) {
1019 struct afs_table *t = &afs_tables[i];
1021 if (!(table_mask & (1 << i)))
1025 ret = t->create(database_dir);
1028 para_printf(&pb, "successfully created %s table\n", t->name);
1030 ret = open_afs_tables();
1033 para_printf(&pb, "%s\n", para_strerror(-ret));
1035 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
1039 int com_init(struct command_context *cc)
1042 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1043 struct osl_object query = {.data = &table_mask,
1044 .size = sizeof(table_mask)};
1046 ret = make_database_dir();
1049 if (cc->argc != 1) {
1051 for (i = 1; i < cc->argc; i++) {
1052 for (j = 0; j < NUM_AFS_TABLES; j++) {
1053 struct afs_table *t = &afs_tables[j];
1055 if (strcmp(cc->argv[i], t->name))
1057 table_mask |= (1 << j);
1060 if (j == NUM_AFS_TABLES)
1061 return -E_BAD_TABLE_NAME;
1064 ret = send_callback_request(create_tables_callback, &query,
1065 afs_cb_result_handler, cc);
1067 /* ignore return value */
1068 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
1073 * Flags for the check command.
1077 enum com_check_flags {
1078 /** Check the audio file table. */
1080 /** Check the mood table. */
1082 /** Check the playlist table. */
1086 int com_check(struct command_context *cc)
1091 for (i = 1; i < cc->argc; i++) {
1092 const char *arg = cc->argv[i];
1095 if (!strcmp(arg, "--")) {
1099 if (!strcmp(arg, "-a")) {
1103 if (!strcmp(arg, "-p")) {
1104 flags |= CHECK_PLAYLISTS;
1107 if (!strcmp(arg, "-m")) {
1108 flags |= CHECK_MOODS;
1111 return -E_AFS_SYNTAX;
1114 return -E_AFS_SYNTAX;
1117 if (flags & CHECK_AFT) {
1118 ret = send_callback_request(aft_check_callback, NULL,
1119 afs_cb_result_handler, cc);
1123 if (flags & CHECK_PLAYLISTS) {
1124 ret = send_callback_request(playlist_check_callback,
1125 NULL, afs_cb_result_handler, cc);
1129 if (flags & CHECK_MOODS) {
1130 ret = send_callback_request(mood_check_callback, NULL,
1131 afs_cb_result_handler, cc);
1139 * The afs event dispatcher.
1141 * \param event Type of the event.
1142 * \param pb May be \p NULL.
1143 * \param data Type depends on \a event.
1145 * This function calls the table handlers of all tables and passes \a pb and \a
1146 * data verbatim. It's up to the handlers to interpret the \a data pointer.
1148 void afs_event(enum afs_events event, struct para_buffer *pb,
1153 for (i = 0; i < NUM_AFS_TABLES; i++) {
1154 struct afs_table *t = &afs_tables[i];
1155 if (!t->event_handler)
1157 ret = t->event_handler(event, pb, data);
1159 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1160 event, para_strerror(-ret));
1165 * Dummy event handler for the images table.
1167 * \param event Unused.
1169 * \param data Unused.
1171 * \return The images table does not honor events, so this handler always
1174 __a_const int images_event_handler(__a_unused enum afs_events event,
1175 __a_unused struct para_buffer *pb, __a_unused void *data)
1181 * Dummy event handler for the lyrics table.
1183 * \param event Unused.
1185 * \param data Unused.
1187 * \return The lyrics table does not honor events, so this handler always
1190 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1191 __a_unused struct para_buffer *pb, __a_unused void *data)