2 * Copyright (C) 2007-2014 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.c Paraslash's audio file selector. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
15 #include <arpa/inet.h>
19 #include "server.cmdline.h"
37 /** The osl tables used by afs. \sa blob.c. */
39 /** Contains audio file information. See aft.c. */
41 /** The table for the paraslash attributes. See attribute.c. */
44 * Paraslash's scoring system is based on Gaussian normal
45 * distributions, and the relevant data is stored in the rbtrees of an
46 * osl table containing only volatile columns. See score.c for
51 * A standard blob table containing the mood definitions. For details
55 /** A blob table containing lyrics on a per-song basis. */
57 /** Another blob table for images (for example album cover art). */
59 /** Yet another blob table for storing standard playlists. */
61 /** How many tables are in use? */
65 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
66 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
67 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
68 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
69 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
70 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
71 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
72 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
76 /** The file descriptor for the local socket. */
79 * Value sent by the command handlers to identify themselves as
80 * children of the running para_server.
83 /** The associated task structure. */
88 extern struct misc_meta_data *mmd;
90 static int server_socket;
91 static struct command_task command_task_struct;
92 static struct signal_task signal_task_struct;
94 static enum play_mode current_play_mode;
95 static char *current_mop; /* mode or playlist specifier. NULL means dummy mood */
98 * A random number used to "authenticate" the connection.
100 * para_server picks this number by random before forking the afs process. The
101 * command handlers write this number together with the id of the shared memory
102 * area containing the query. This way, a malicious local user has to know this
103 * number to be able to cause the afs process to crash by sending fake queries.
105 extern uint32_t afs_socket_cookie;
108 * Struct to let command handlers execute a callback in afs context.
110 * Commands that need to change the state of afs can't change the relevant data
111 * structures directly because commands are executed in a child process, i.e.
112 * they get their own virtual address space.
114 * This structure is used by \p send_callback_request() (executed from handler
115 * context) in order to let the afs process call the specified function. An
116 * instance of that structure is written to a shared memory area together with
117 * the arguments to the callback function. The identifier of the shared memory
118 * area is written to the command socket.
120 * The afs process accepts connections on the command socket and reads the
121 * shared memory id, attaches the corresponding area, calls the given handler to
122 * perform the desired action and to optionally compute a result.
124 * The result and a \p callback_result structure is then written to another
125 * shared memory area. The identifier for that area is written to the handler's
126 * command socket, so that the handler process can read the id, attach the
127 * shared memory area and use the result.
129 * \sa struct callback_result.
131 struct callback_query {
132 /** The function to be called. */
133 callback_function *handler;
134 /** The number of bytes of the query */
139 * Structure embedded in the result of a callback.
141 * If the callback produced a result, an instance of that structure is embedded
142 * into the shared memory area holding the result, mainly to let the command
143 * handler know the size of the result.
145 * \sa struct callback_query.
147 struct callback_result {
148 /** The number of bytes of the result. */
150 /** The band designator (loglevel for the result). */
154 static int dispatch_result(int result_shmid, callback_result_handler *handler,
155 void *private_result_data)
157 struct osl_object result;
159 /* must attach r/w as result.data might get encrypted in-place. */
160 int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
161 struct callback_result *cr = result_shm;
164 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
167 result.size = cr->result_size;
168 result.data = result_shm + sizeof(*cr);
171 ret = handler(&result, cr->band, private_result_data);
173 PARA_NOTICE_LOG("result handler error: %s\n",
174 para_strerror(-ret));
176 ret2 = shm_detach(result_shm);
178 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
186 * Ask the afs process to call a given function.
188 * \param f The function to be called.
189 * \param query Pointer to arbitrary data for the callback.
190 * \param result_handler Called for each shm area sent by the callback.
191 * \param private_result_data Passed verbatim to \a result_handler.
193 * This function creates a socket for communication with the afs process and a
194 * shared memory area (sma) to which the buffer pointed to by \a query is
195 * copied. It then notifies the afs process that the callback function \a f
196 * should be executed by sending the shared memory identifier (shmid) to the
199 * If the callback produces a result, it sends any number of shared memory
200 * identifiers back via the socket. For each such identifier received, \a
201 * result_handler is called. The contents of the sma identified by the received
202 * shmid are passed to that function as an osl object. The private_result_data
203 * pointer is passed as the second argument to \a result_handler.
205 * \return Number of shared memory areas dispatched on success, negative on errors.
207 * \sa send_option_arg_callback_request(), send_standard_callback_request().
209 int send_callback_request(callback_function *f, struct osl_object *query,
210 callback_result_handler *result_handler,
211 void *private_result_data)
213 struct callback_query *cq;
214 int ret, fd = -1, query_shmid, result_shmid;
216 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
217 size_t query_shm_size = sizeof(*cq);
218 int dispatch_error = 0, num_dispatched = 0;
221 query_shm_size += query->size;
222 ret = shm_new(query_shm_size);
226 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
231 cq->query_size = query_shm_size - sizeof(*cq);
234 memcpy(query_shm + sizeof(*cq), query->data, query->size);
235 ret = shm_detach(query_shm);
239 *(uint32_t *) buf = afs_socket_cookie;
240 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
242 ret = connect_local_socket(conf.afs_socket_arg);
246 ret = write_all(fd, buf, sizeof(buf));
250 * Read all shmids from afs.
252 * Even if the dispatcher returns an error we _must_ continue to read
253 * shmids from fd so that we can destroy all shared memory areas that
254 * have been created for us by the afs process.
257 ret = recv_bin_buffer(fd, buf, sizeof(int));
260 assert(ret == sizeof(int));
264 if (!dispatch_error) {
265 ret = dispatch_result(result_shmid, result_handler,
266 private_result_data);
270 ret = shm_destroy(result_shmid);
272 PARA_CRIT_LOG("destroy result failed: %s\n",
273 para_strerror(-ret));
277 if (shm_destroy(query_shmid) < 0)
278 PARA_CRIT_LOG("shm destroy error\n");
281 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
282 return ret < 0? ret : num_dispatched;
286 * Send a callback request passing an options structure and an argument vector.
288 * \param options pointer to an arbitrary data structure.
289 * \param argc Argument count.
290 * \param argv Standard argument vector.
291 * \param f The callback function.
292 * \param result_handler See \ref send_callback_request.
293 * \param private_result_data See \ref send_callback_request.
295 * Some commands have a couple of options that are parsed in child context for
296 * syntactic correctness and are stored in a special options structure for that
297 * command. This function allows to pass such a structure together with a list
298 * of further arguments (often a list of audio files) to the parent process.
300 * \return The return value of the underlying call to \ref
301 * send_callback_request().
303 * \sa send_standard_callback_request(), send_callback_request().
305 int send_option_arg_callback_request(struct osl_object *options,
306 int argc, char * const * const argv, callback_function *f,
307 callback_result_handler *result_handler,
308 void *private_result_data)
312 struct osl_object query = {.size = options? options->size : 0};
314 for (i = 0; i < argc; i++)
315 query.size += strlen(argv[i]) + 1;
316 query.data = para_malloc(query.size);
319 memcpy(query.data, options->data, options->size);
322 for (i = 0; i < argc; i++) {
323 strcpy(p, argv[i]); /* OK */
324 p += strlen(argv[i]) + 1;
326 ret = send_callback_request(f, &query, result_handler,
327 private_result_data);
333 * Send a callback request with an argument vector only.
335 * \param argc The same meaning as in send_option_arg_callback_request().
336 * \param argv The same meaning as in send_option_arg_callback_request().
337 * \param f The same meaning as in send_option_arg_callback_request().
338 * \param result_handler See \ref send_callback_request.
339 * \param private_result_data See \ref send_callback_request.
341 * This is similar to send_option_arg_callback_request(), but no options buffer
342 * is passed to the parent process.
344 * \return The return value of the underlying call to
345 * send_option_arg_callback_request().
347 int send_standard_callback_request(int argc, char * const * const argv,
348 callback_function *f, callback_result_handler *result_handler,
349 void *private_result_data)
351 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
352 private_result_data);
355 static int action_if_pattern_matches(struct osl_row *row, void *data)
357 struct pattern_match_data *pmd = data;
358 struct osl_object name_obj;
359 const char *p, *name;
360 int ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj));
361 const char *pattern_txt = (const char *)pmd->patterns.data;
365 name = (char *)name_obj.data;
366 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
368 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
369 return pmd->action(pmd->table, row, name, pmd->data);
370 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
371 p += strlen(p) + 1) {
372 ret = fnmatch(p, name, pmd->fnmatch_flags);
373 if (ret == FNM_NOMATCH)
377 ret = pmd->action(pmd->table, row, name, pmd->data);
386 * Execute the given function for each matching row.
388 * \param pmd Describes what to match and how.
392 int for_each_matching_row(struct pattern_match_data *pmd)
394 if (pmd->pm_flags & PM_REVERSE_LOOP)
395 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
396 action_if_pattern_matches));
397 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
398 action_if_pattern_matches));
402 * Compare two osl objects of string type.
404 * \param obj1 Pointer to the first object.
405 * \param obj2 Pointer to the second object.
407 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
408 * are taken into account.
410 * \return It returns an integer less than, equal to, or greater than zero if
411 * \a obj1 is found, respectively, to be less than, to match, or be greater than
414 * \sa strcmp(3), strncmp(3), osl_compare_func.
416 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
418 const char *str1 = (const char *)obj1->data;
419 const char *str2 = (const char *)obj2->data;
420 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
423 static int pass_afd(int fd, char *buf, size_t size)
425 struct msghdr msg = {.msg_iov = NULL};
426 struct cmsghdr *cmsg;
437 msg.msg_control = control;
438 msg.msg_controllen = sizeof(control);
440 cmsg = CMSG_FIRSTHDR(&msg);
441 cmsg->cmsg_level = SOL_SOCKET;
442 cmsg->cmsg_type = SCM_RIGHTS;
443 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
444 *(int *)CMSG_DATA(cmsg) = fd;
446 /* Sum of the length of all control messages in the buffer */
447 msg.msg_controllen = cmsg->cmsg_len;
448 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
449 ret = sendmsg(server_socket, &msg, 0);
451 ret = -ERRNO_TO_PARA_ERROR(errno);
458 * Open the audio file with highest score.
460 * This stores all information for streaming the "best" audio file in a shared
461 * memory area. The id of that area and an open file descriptor for the next
462 * audio file are passed to the server process.
466 * \sa open_and_update_audio_file().
468 static int open_next_audio_file(void)
470 struct osl_row *aft_row;
471 struct audio_file_data afd;
476 PARA_NOTICE_LOG("getting next audio file\n");
477 ret = score_get_best(&aft_row, &score);
479 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
480 goto no_admissible_files;
482 ret = open_and_update_audio_file(aft_row, score, &afd);
484 ret = score_delete(aft_row);
486 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
487 goto no_admissible_files;
492 if (!write_ok(server_socket)) {
496 *(uint32_t *)buf = NEXT_AUDIO_FILE;
497 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
498 ret = pass_afd(afd.fd, buf, 8);
506 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
507 *(uint32_t *)(buf + 4) = (uint32_t)0;
508 return write_all(server_socket, buf, 8);
511 /* Never fails if arg == NULL */
512 static int activate_mood_or_playlist(char *arg, int *num_admissible)
518 ret = change_current_mood(NULL); /* always successful */
519 mode = PLAY_MODE_MOOD;
521 if (!strncmp(arg, "p/", 2)) {
522 ret = playlist_open(arg + 2);
523 mode = PLAY_MODE_PLAYLIST;
524 } else if (!strncmp(arg, "m/", 2)) {
525 ret = change_current_mood(arg + 2);
526 mode = PLAY_MODE_MOOD;
528 return -E_AFS_SYNTAX;
533 *num_admissible = ret;
534 current_play_mode = mode;
535 if (arg != current_mop) {
538 current_mop = para_strdup(arg);
539 mutex_lock(mmd_mutex);
540 strncpy(mmd->afs_mode_string, arg,
541 sizeof(mmd->afs_mode_string));
542 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
543 mutex_unlock(mmd_mutex);
545 mutex_lock(mmd_mutex);
546 strcpy(mmd->afs_mode_string, "dummy");
547 mutex_unlock(mmd_mutex);
555 * Result handler for sending data to the para_client process.
557 * \param result The data to be sent.
558 * \param band The band designator.
559 * \param private Pointer to the command context.
561 * \return The return value of the underlying call to \ref command.c::send_sb.
563 * \sa \ref callback_result_handler, \ref command.c::send_sb.
565 int afs_cb_result_handler(struct osl_object *result, uint8_t band,
568 struct command_context *cc = private;
573 return send_sb(&cc->scc, result->data, result->size, band, true);
576 static void com_select_callback(int fd, const struct osl_object *query)
578 struct para_buffer pb = {
579 .max_size = shm_get_shmmax(),
580 .private_data = &(struct afs_max_size_handler_data) {
584 .max_size_handler = afs_max_size_handler,
586 char *arg = query->data;
587 int num_admissible, ret, ret2;
589 ret = clear_score_table();
591 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
594 if (current_play_mode == PLAY_MODE_MOOD)
595 close_current_mood();
598 ret = activate_mood_or_playlist(arg, &num_admissible);
600 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
601 para_strerror(-ret), current_mop?
602 current_mop : "dummy");
603 ret = activate_mood_or_playlist(current_mop, &num_admissible);
606 ret2 = para_printf(&pb, "failed, switching to dummy\n");
607 activate_mood_or_playlist(NULL, &num_admissible);
610 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
611 current_mop : "dummy mood", num_admissible);
613 if (ret2 >= 0 && pb.offset)
614 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
618 int com_select(struct command_context *cc)
620 struct osl_object query;
623 return -E_AFS_SYNTAX;
624 query.data = cc->argv[1];
625 query.size = strlen(cc->argv[1]) + 1;
626 return send_callback_request(com_select_callback, &query,
627 &afs_cb_result_handler, cc);
630 static void init_admissible_files(char *arg)
632 if (activate_mood_or_playlist(arg, NULL) < 0)
633 activate_mood_or_playlist(NULL, NULL); /* always successful */
636 static int setup_command_socket_or_die(void)
639 char *socket_name = conf.afs_socket_arg;
640 struct sockaddr_un unix_addr;
643 ret = create_local_socket(socket_name, &unix_addr,
644 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
646 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
650 if (listen(socket_fd , 5) < 0) {
651 PARA_EMERG_LOG("can not listen on socket\n");
654 ret = mark_fd_nonblocking(socket_fd);
659 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
664 static void close_afs_tables(void)
667 PARA_NOTICE_LOG("closing afs_tables\n");
668 for (i = 0; i < NUM_AFS_TABLES; i++)
669 afs_tables[i].close();
672 static char *database_dir;
674 static void get_database_dir(void)
677 if (conf.afs_database_dir_given)
678 database_dir = para_strdup(conf.afs_database_dir_arg);
680 char *home = para_homedir();
681 database_dir = make_message(
682 "%s/.paraslash/afs_database-0.4", home);
686 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
689 static int make_database_dir(void)
694 ret = para_mkdir(database_dir, 0777);
695 if (ret >= 0 || is_errno(-ret, EEXIST))
700 static int open_afs_tables(void)
705 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
707 for (i = 0; i < NUM_AFS_TABLES; i++) {
708 ret = afs_tables[i].open(database_dir);
711 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
712 para_strerror(-ret));
718 afs_tables[--i].close();
722 static void signal_pre_select(struct sched *s, void *context)
724 struct signal_task *st = context;
725 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
728 static int afs_signal_post_select(struct sched *s, __a_unused void *context)
732 if (getppid() == 1) {
733 PARA_EMERG_LOG("para_server died\n");
736 signum = para_next_signal(&s->rfds);
739 if (signum == SIGHUP) {
741 parse_config_or_die(1);
742 ret = open_afs_tables();
745 init_admissible_files(current_mop);
748 PARA_EMERG_LOG("terminating on signal %d\n", signum);
750 task_notify_all(s, E_AFS_SIGNAL);
751 return -E_AFS_SIGNAL;
754 static void register_signal_task(struct sched *s)
756 struct signal_task *st = &signal_task_struct;
758 para_sigaction(SIGPIPE, SIG_IGN);
759 st->fd = para_signal_init();
760 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
761 para_install_sighandler(SIGINT);
762 para_install_sighandler(SIGTERM);
763 para_install_sighandler(SIGHUP);
765 st->task = task_register(&(struct task_info) {
767 .pre_select = signal_pre_select,
768 .post_select = afs_signal_post_select,
774 static struct list_head afs_client_list;
776 /** Describes on connected afs client. */
778 /** Position in the afs client list. */
779 struct list_head node;
780 /** The socket file descriptor for this client. */
782 /** The time the client connected. */
783 struct timeval connect_time;
786 static void command_pre_select(struct sched *s, void *context)
788 struct command_task *ct = context;
789 struct afs_client *client;
791 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
792 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
793 list_for_each_entry(client, &afs_client_list, node)
794 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
798 * Send data as shared memory to a file descriptor.
800 * \param fd File descriptor to send the shmid to.
801 * \param band The band designator for this data.
802 * \param buf The buffer holding the data to be sent.
803 * \param size The size of \a buf.
805 * This function creates a shared memory area large enough to hold
806 * the content given by \a buf and \a size and sends the identifier
807 * of this area to the file descriptor \a fd.
809 * It is called by the AFS max_size handler as well as directly by the AFS
810 * command callbacks to send command output to the command handlers.
812 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
813 * and positive on success.
815 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size)
819 struct callback_result *cr;
823 ret = shm_new(size + sizeof(*cr));
827 ret = shm_attach(shmid, ATTACH_RW, &shm);
831 cr->result_size = size;
833 memcpy(shm + sizeof(*cr), buf, size);
834 ret = shm_detach(shm);
837 ret = write_all(fd, (char *)&shmid, sizeof(int));
841 if (shm_destroy(shmid) < 0)
842 PARA_ERROR_LOG("destroy result failed\n");
847 * On errors, negative value is written to fd.
848 * On success: If query produced a result, the result_shmid is written to fd.
849 * Otherwise, zero is written.
851 static int call_callback(int fd, int query_shmid)
854 struct callback_query *cq;
855 struct osl_object query;
858 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
862 query.data = (char *)query_shm + sizeof(*cq);
863 query.size = cq->query_size;
864 cq->handler(fd, &query);
865 return shm_detach(query_shm);
868 static int execute_server_command(fd_set *rfds)
872 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
874 if (ret < 0 || n == 0)
877 if (strcmp(buf, "new"))
879 return open_next_audio_file();
882 /* returns 0 if no data available, 1 else */
883 static int execute_afs_command(int fd, fd_set *rfds, uint32_t expected_cookie)
887 char buf[sizeof(cookie) + sizeof(query_shmid)];
889 int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
895 if (n != sizeof(buf)) {
896 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
897 ret, (long unsigned) sizeof(buf));
900 cookie = *(uint32_t *)buf;
901 if (cookie != expected_cookie) {
902 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
903 (unsigned)cookie, (unsigned)expected_cookie);
906 query_shmid = *(int *)(buf + sizeof(cookie));
907 if (query_shmid < 0) {
908 PARA_WARNING_LOG("received invalid query shmid %d)\n",
912 ret = call_callback(fd, query_shmid);
916 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
920 /** Shutdown connection if query has not arrived until this many seconds. */
921 #define AFS_CLIENT_TIMEOUT 3
923 static int command_post_select(struct sched *s, void *context)
925 struct command_task *ct = context;
926 struct sockaddr_un unix_addr;
927 struct afs_client *client, *tmp;
930 ret = task_get_notification(ct->task);
933 ret = execute_server_command(&s->rfds);
935 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
936 task_notify_all(s, -ret);
939 /* Check the list of connected clients. */
940 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
941 ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
942 if (ret == 0) { /* prevent bogus connection flooding */
944 tv_diff(now, &client->connect_time, &diff);
945 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
947 PARA_WARNING_LOG("connection timeout\n");
950 list_del(&client->node);
953 /* Accept connections on the local socket. */
954 ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
956 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
959 ret = mark_fd_nonblocking(fd);
961 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
965 client = para_malloc(sizeof(*client));
967 client->connect_time = *now;
968 para_list_add(&client->node, &afs_client_list);
972 static void register_command_task(uint32_t cookie, struct sched *s)
974 struct command_task *ct = &command_task_struct;
975 ct->fd = setup_command_socket_or_die();
978 ct->task = task_register(&(struct task_info) {
979 .name = "afs command",
980 .pre_select = command_pre_select,
981 .post_select = command_post_select,
987 * Initialize the audio file selector process.
989 * \param cookie The value used for "authentication".
990 * \param socket_fd File descriptor used for communication with the server.
992 __noreturn void afs_init(uint32_t cookie, int socket_fd)
994 static struct sched s;
997 register_signal_task(&s);
998 INIT_LIST_HEAD(&afs_client_list);
999 for (i = 0; i < NUM_AFS_TABLES; i++)
1000 afs_tables[i].init(&afs_tables[i]);
1001 ret = open_afs_tables();
1004 server_socket = socket_fd;
1005 ret = mark_fd_nonblocking(server_socket);
1008 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1009 server_socket, (unsigned) cookie);
1010 init_admissible_files(conf.afs_initial_mode_arg);
1011 register_command_task(cookie, &s);
1012 s.default_timeout.tv_sec = 0;
1013 s.default_timeout.tv_usec = 999 * 1000;
1020 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1024 static void create_tables_callback(int fd, const struct osl_object *query)
1026 uint32_t table_mask = *(uint32_t *)query->data;
1028 struct para_buffer pb = {.buf = NULL};
1031 for (i = 0; i < NUM_AFS_TABLES; i++) {
1032 struct afs_table *t = &afs_tables[i];
1034 if (!(table_mask & (1 << i)))
1038 ret = t->create(database_dir);
1041 para_printf(&pb, "successfully created %s table\n", t->name);
1043 ret = open_afs_tables();
1046 para_printf(&pb, "%s\n", para_strerror(-ret));
1048 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
1052 int com_init(struct command_context *cc)
1055 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1056 struct osl_object query = {.data = &table_mask,
1057 .size = sizeof(table_mask)};
1059 ret = make_database_dir();
1062 if (cc->argc != 1) {
1064 for (i = 1; i < cc->argc; i++) {
1065 for (j = 0; j < NUM_AFS_TABLES; j++) {
1066 struct afs_table *t = &afs_tables[j];
1068 if (strcmp(cc->argv[i], t->name))
1070 table_mask |= (1 << j);
1073 if (j == NUM_AFS_TABLES)
1074 return -E_BAD_TABLE_NAME;
1077 ret = send_callback_request(create_tables_callback, &query,
1078 afs_cb_result_handler, cc);
1083 * Flags for the check command.
1087 enum com_check_flags {
1088 /** Check the audio file table. */
1090 /** Check the mood table. */
1092 /** Check the playlist table. */
1096 int com_check(struct command_context *cc)
1101 for (i = 1; i < cc->argc; i++) {
1102 const char *arg = cc->argv[i];
1105 if (!strcmp(arg, "--")) {
1109 if (!strcmp(arg, "-a")) {
1113 if (!strcmp(arg, "-p")) {
1114 flags |= CHECK_PLAYLISTS;
1117 if (!strcmp(arg, "-m")) {
1118 flags |= CHECK_MOODS;
1121 return -E_AFS_SYNTAX;
1124 return -E_AFS_SYNTAX;
1127 if (flags & CHECK_AFT) {
1128 ret = send_callback_request(aft_check_callback, NULL,
1129 afs_cb_result_handler, cc);
1133 if (flags & CHECK_PLAYLISTS) {
1134 ret = send_callback_request(playlist_check_callback,
1135 NULL, afs_cb_result_handler, cc);
1139 if (flags & CHECK_MOODS) {
1140 ret = send_callback_request(mood_check_callback, NULL,
1141 afs_cb_result_handler, cc);
1149 * The afs event dispatcher.
1151 * \param event Type of the event.
1152 * \param pb May be \p NULL.
1153 * \param data Type depends on \a event.
1155 * This function calls the table handlers of all tables and passes \a pb and \a
1156 * data verbatim. It's up to the handlers to interpret the \a data pointer.
1158 void afs_event(enum afs_events event, struct para_buffer *pb,
1163 for (i = 0; i < NUM_AFS_TABLES; i++) {
1164 struct afs_table *t = &afs_tables[i];
1165 if (!t->event_handler)
1167 ret = t->event_handler(event, pb, data);
1169 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1170 event, para_strerror(-ret));
1175 * Dummy event handler for the images table.
1177 * \param event Unused.
1179 * \param data Unused.
1181 * \return The images table does not honor events, so this handler always
1184 __a_const int images_event_handler(__a_unused enum afs_events event,
1185 __a_unused struct para_buffer *pb, __a_unused void *data)
1191 * Dummy event handler for the lyrics table.
1193 * \param event Unused.
1195 * \param data Unused.
1197 * \return The lyrics table does not honor events, so this handler always
1200 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1201 __a_unused struct para_buffer *pb, __a_unused void *data)