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"
30 /** The osl tables used by afs. \sa blob.c. */
32 /** Contains audio file information. See aft.c. */
34 /** The table for the paraslash attributes. See attribute.c. */
37 * Paraslash's scoring system is based on Gaussian normal
38 * distributions, and the relevant data is stored in the rbtrees of an
39 * osl table containing only volatile columns. See score.c for
44 * A standard blob table containing the mood definitions. For details
48 /** A blob table containing lyrics on a per-song basis. */
50 /** Another blob table for images (for example album cover art). */
52 /** Yet another blob table for storing standard playlists. */
54 /** How many tables are in use? */
58 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
59 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
60 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
61 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
62 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
63 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
64 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
65 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
69 /** The file descriptor for the local socket. */
72 * Value sent by the command handlers to identify themselves as
73 * children of the running para_server.
76 /** The associated task structure. */
81 extern struct misc_meta_data *mmd;
83 static int server_socket;
84 static struct command_task command_task_struct;
85 static struct signal_task signal_task_struct;
87 static enum play_mode current_play_mode;
88 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
91 * A random number used to "authenticate" the connection.
93 * para_server picks this number by random before forking the afs process. The
94 * command handlers write this number together with the id of the shared memory
95 * area containing the query. This way, a malicious local user has to know this
96 * number to be able to cause the afs process to crash by sending fake queries.
98 extern uint32_t afs_socket_cookie;
101 * Struct to let command handlers execute a callback in afs context.
103 * Commands that need to change the state of afs can't change the relevant data
104 * structures directly because commands are executed in a child process, i.e.
105 * they get their own virtual address space.
107 * This structure is used by \p send_callback_request() (executed from handler
108 * context) in order to let the afs process call the specified function. An
109 * instance of that structure is written to a shared memory area together with
110 * the arguments to the callback function. The identifier of the shared memory
111 * area is written to the command socket.
113 * The afs process accepts connections on the command socket and reads the
114 * shared memory id, attaches the corresponing area, calls the given handler to
115 * perform the desired action and to optionally compute a result.
117 * The result and a \p callback_result structure is then written to another
118 * shared memory area. The identifier for that area is written to the handler's
119 * command socket, so that the handler process can read the id, attach the
120 * shared memory area and use the result.
122 * \sa struct callback_result.
124 struct callback_query {
125 /** The function to be called. */
126 callback_function *handler;
127 /** The number of bytes of the query */
132 * Structure embedded in the result of a callback.
134 * If the callback produced a result, an instance of that structure is embeeded
135 * into the shared memory area holding the result, mainly to let the command
136 * handler know the size of the result.
138 * \sa struct callback_query.
140 struct callback_result {
141 /** The number of bytes of the result. */
145 static int dispatch_result(int result_shmid, callback_result_handler *handler,
146 void *private_result_data)
148 struct osl_object result;
150 int ret2, ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
151 struct callback_result *cr = result_shm;
154 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
157 result.size = cr->result_size;
158 result.data = result_shm + sizeof(*cr);
161 ret = handler(&result, private_result_data);
163 PARA_NOTICE_LOG("result handler error: %s\n",
164 para_strerror(-ret));
166 ret2 = shm_detach(result_shm);
168 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
176 * Ask the afs process to call a given function.
178 * \param f The function to be called.
179 * \param query Pointer to arbitrary data for the callback.
180 * \param result_handler Called for each shm area sent by the callback.
181 * \param private_result_data Passed verbatim to \a result_handler.
183 * This function creates a socket for communication with the afs process and a
184 * shared memory area (sma) to which the buffer pointed to by \a query is
185 * copied. It then notifies the afs process that the callback function \a f
186 * should be executed by sending the shared memory identifier (shmid) to the
189 * If the callback produces a result, it sends any number of shared memory
190 * identifiers back via the socket. For each such identifier received, \a
191 * result_handler is called. The contents of the sma identified by the received
192 * shmid are passed to that function as an osl object. The private_result_data
193 * pointer is passed as the second argument to \a result_handler.
195 * \return Number of shared memory areas dispatched on success, negative on errors.
197 * \sa send_option_arg_callback_request(), send_standard_callback_request().
199 int send_callback_request(callback_function *f, struct osl_object *query,
200 callback_result_handler *result_handler,
201 void *private_result_data)
203 struct callback_query *cq;
204 int ret, fd = -1, query_shmid, result_shmid;
206 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
207 size_t query_shm_size = sizeof(*cq);
208 int dispatch_error = 0, num_dispatched = 0;
211 query_shm_size += query->size;
212 ret = shm_new(query_shm_size);
216 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
221 cq->query_size = query_shm_size - sizeof(*cq);
224 memcpy(query_shm + sizeof(*cq), query->data, query->size);
225 ret = shm_detach(query_shm);
229 *(uint32_t *) buf = afs_socket_cookie;
230 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
232 ret = connect_local_socket(conf.afs_socket_arg);
236 ret = write_all(fd, buf, sizeof(buf));
240 * Read all shmids from afs.
242 * Even if the dispatcher returns an error we _must_ continue to read
243 * shmids from fd so that we can destroy all shared memory areas that
244 * have been created for us by the afs process.
247 ret = recv_bin_buffer(fd, buf, sizeof(int));
250 assert(ret == sizeof(int));
254 if (!dispatch_error) {
255 ret = dispatch_result(result_shmid, result_handler,
256 private_result_data);
260 ret = shm_destroy(result_shmid);
262 PARA_CRIT_LOG("destroy result failed: %s\n",
263 para_strerror(-ret));
267 if (shm_destroy(query_shmid) < 0)
268 PARA_CRIT_LOG("shm destroy error\n");
271 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
272 return ret < 0? ret : num_dispatched;
276 * Send a callback request passing an options structure and an argument vector.
278 * \param options pointer to an arbitrary data structure.
279 * \param argc Argument count.
280 * \param argv Standard argument vector.
281 * \param f The callback function.
282 * \param result_handler See \ref send_callback_request.
283 * \param private_result_data See \ref send_callback_request.
285 * Some commands have a couple of options that are parsed in child context for
286 * syntactic correctness and are stored in a special options structure for that
287 * command. This function allows to pass such a structure together with a list
288 * of further arguments (often a list of audio files) to the parent process.
290 * \return The return value of the underlying call to \ref
291 * send_callback_request().
293 * \sa send_standard_callback_request(), send_callback_request().
295 int send_option_arg_callback_request(struct osl_object *options,
296 int argc, char * const * const argv, callback_function *f,
297 callback_result_handler *result_handler,
298 void *private_result_data)
302 struct osl_object query = {.size = options? options->size : 0};
304 for (i = 0; i < argc; i++)
305 query.size += strlen(argv[i]) + 1;
306 query.data = para_malloc(query.size);
309 memcpy(query.data, options->data, options->size);
312 for (i = 0; i < argc; i++) {
313 strcpy(p, argv[i]); /* OK */
314 p += strlen(argv[i]) + 1;
316 ret = send_callback_request(f, &query, result_handler,
317 private_result_data);
323 * Send a callback request with an argument vector only.
325 * \param argc The same meaning as in send_option_arg_callback_request().
326 * \param argv The same meaning as in send_option_arg_callback_request().
327 * \param f The same meaning as in send_option_arg_callback_request().
328 * \param result_handler See \ref send_callback_request.
329 * \param private_result_data See \ref send_callback_request.
331 * This is similar to send_option_arg_callback_request(), but no options buffer
332 * is passed to the parent process.
334 * \return The return value of the underlying call to
335 * send_option_arg_callback_request().
337 int send_standard_callback_request(int argc, char * const * const argv,
338 callback_function *f, callback_result_handler *result_handler,
339 void *private_result_data)
341 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
342 private_result_data);
345 static int action_if_pattern_matches(struct osl_row *row, void *data)
347 struct pattern_match_data *pmd = data;
348 struct osl_object name_obj;
349 const char *p, *name;
350 int ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj));
351 const char *pattern_txt = (const char *)pmd->patterns.data;
355 name = (char *)name_obj.data;
356 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
358 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
359 return pmd->action(pmd->table, row, name, pmd->data);
360 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
361 p += strlen(p) + 1) {
362 ret = fnmatch(p, name, pmd->fnmatch_flags);
363 if (ret == FNM_NOMATCH)
367 ret = pmd->action(pmd->table, row, name, pmd->data);
376 * Execute the given function for each matching row.
378 * \param pmd Describes what to match and how.
382 int for_each_matching_row(struct pattern_match_data *pmd)
384 if (pmd->pm_flags & PM_REVERSE_LOOP)
385 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
386 action_if_pattern_matches));
387 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
388 action_if_pattern_matches));
392 * Compare two osl objects of string type.
394 * \param obj1 Pointer to the first object.
395 * \param obj2 Pointer to the second object.
397 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
398 * are taken into account.
400 * \return It returns an integer less than, equal to, or greater than zero if
401 * \a obj1 is found, respectively, to be less than, to match, or be greater than
404 * \sa strcmp(3), strncmp(3), osl_compare_func.
406 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
408 const char *str1 = (const char *)obj1->data;
409 const char *str2 = (const char *)obj2->data;
410 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
413 static int pass_afd(int fd, char *buf, size_t size)
415 struct msghdr msg = {.msg_iov = NULL};
416 struct cmsghdr *cmsg;
427 msg.msg_control = control;
428 msg.msg_controllen = sizeof(control);
430 cmsg = CMSG_FIRSTHDR(&msg);
431 cmsg->cmsg_level = SOL_SOCKET;
432 cmsg->cmsg_type = SCM_RIGHTS;
433 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
434 *(int *)CMSG_DATA(cmsg) = fd;
436 /* Sum of the length of all control messages in the buffer */
437 msg.msg_controllen = cmsg->cmsg_len;
438 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
439 ret = sendmsg(server_socket, &msg, 0);
441 ret = -ERRNO_TO_PARA_ERROR(errno);
448 * Open the audio file with highest score.
450 * This stores all information for streaming the "best" audio file in a shared
451 * memory area. The id of that area and an open file descriptor for the next
452 * audio file are passed to the server process.
456 * \sa open_and_update_audio_file().
458 static int open_next_audio_file(void)
460 struct osl_row *aft_row;
461 struct audio_file_data afd;
466 PARA_NOTICE_LOG("getting next audio file\n");
467 ret = score_get_best(&aft_row, &score);
469 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
470 goto no_admissible_files;
472 ret = open_and_update_audio_file(aft_row, score, &afd);
474 ret = score_delete(aft_row);
476 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
477 goto no_admissible_files;
482 if (!write_ok(server_socket)) {
486 *(uint32_t *)buf = NEXT_AUDIO_FILE;
487 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
488 ret = pass_afd(afd.fd, buf, 8);
496 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
497 *(uint32_t *)(buf + 4) = (uint32_t)0;
498 return write_all(server_socket, buf, 8);
501 /* Never fails if arg == NULL */
502 static int activate_mood_or_playlist(char *arg, int *num_admissible)
508 ret = change_current_mood(NULL); /* always successful */
509 mode = PLAY_MODE_MOOD;
511 if (!strncmp(arg, "p/", 2)) {
512 ret = playlist_open(arg + 2);
513 mode = PLAY_MODE_PLAYLIST;
514 } else if (!strncmp(arg, "m/", 2)) {
515 ret = change_current_mood(arg + 2);
516 mode = PLAY_MODE_MOOD;
518 return -E_AFS_SYNTAX;
523 *num_admissible = ret;
524 current_play_mode = mode;
525 if (arg != current_mop) {
528 current_mop = para_strdup(arg);
529 mutex_lock(mmd_mutex);
530 strncpy(mmd->afs_mode_string, arg,
531 sizeof(mmd->afs_mode_string));
532 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
533 mutex_unlock(mmd_mutex);
535 mutex_lock(mmd_mutex);
536 strcpy(mmd->afs_mode_string, "dummy");
537 mutex_unlock(mmd_mutex);
544 static void com_select_callback(int fd, const struct osl_object *query)
546 struct para_buffer pb = {
547 .max_size = shm_get_shmmax(),
549 .max_size_handler = pass_buffer_as_shm
551 char *arg = query->data;
552 int num_admissible, ret, ret2;
554 ret = clear_score_table();
556 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
559 if (current_play_mode == PLAY_MODE_MOOD)
560 close_current_mood();
563 ret = activate_mood_or_playlist(arg, &num_admissible);
565 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
566 para_strerror(-ret), current_mop?
567 current_mop : "dummy");
568 ret = activate_mood_or_playlist(current_mop, &num_admissible);
571 ret2 = para_printf(&pb, "failed, switching to dummy\n");
572 activate_mood_or_playlist(NULL, &num_admissible);
575 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
576 current_mop : "dummy mood", num_admissible);
578 if (ret2 >= 0 && pb.offset)
579 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
584 * Result handler for sending data to the para_client process.
586 * \param result The data to be sent.
587 * \param private Pointer to the context.
589 * \return The return value of the underlying call to sc_send_bin_buffer().
591 * \sa \ref callback_result_handler, \ref sc_send_bin_buffer().
593 int sc_send_result(struct osl_object *result, void *private)
595 struct stream_cipher_context *scc = private;
600 ret = sc_send_bin_buffer(scc, result->data, result->size);
601 if (ret < 0 || ret == result->size)
603 return -E_SHORT_WRITE;
606 int com_select(struct stream_cipher_context *scc, int argc, char * const * const argv)
608 struct osl_object query;
611 return -E_AFS_SYNTAX;
612 query.data = argv[1];
613 query.size = strlen(argv[1]) + 1;
614 return send_callback_request(com_select_callback, &query,
615 &sc_send_result, scc);
618 static void init_admissible_files(char *arg)
620 if (activate_mood_or_playlist(arg, NULL) < 0)
621 activate_mood_or_playlist(NULL, NULL); /* always successful */
624 static int setup_command_socket_or_die(void)
627 char *socket_name = conf.afs_socket_arg;
628 struct sockaddr_un unix_addr;
631 ret = create_local_socket(socket_name, &unix_addr,
632 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
634 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
638 if (listen(socket_fd , 5) < 0) {
639 PARA_EMERG_LOG("can not listen on socket\n");
642 ret = mark_fd_nonblocking(socket_fd);
647 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
652 static void close_afs_tables(void)
655 PARA_NOTICE_LOG("closing afs_tables\n");
656 for (i = 0; i < NUM_AFS_TABLES; i++)
657 afs_tables[i].close();
660 static char *database_dir;
662 static void get_database_dir(void)
665 if (conf.afs_database_dir_given)
666 database_dir = para_strdup(conf.afs_database_dir_arg);
668 char *home = para_homedir();
669 database_dir = make_message(
670 "%s/.paraslash/afs_database-0.4", home);
674 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
677 static int make_database_dir(void)
682 ret = para_mkdir(database_dir, 0777);
683 if (ret >= 0 || is_errno(-ret, EEXIST))
688 static int open_afs_tables(void)
693 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
695 for (i = 0; i < NUM_AFS_TABLES; i++) {
696 ret = afs_tables[i].open(database_dir);
699 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
700 para_strerror(-ret));
706 afs_tables[--i].close();
710 static void signal_pre_select(struct sched *s, struct task *t)
712 struct signal_task *st = container_of(t, struct signal_task, task);
713 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
716 static void afs_signal_post_select(struct sched *s, struct task *t)
720 if (getppid() == 1) {
721 PARA_EMERG_LOG("para_server died\n");
724 signum = para_next_signal(&s->rfds);
727 if (signum == SIGHUP) {
729 parse_config_or_die(1);
730 t->error = open_afs_tables();
733 init_admissible_files(current_mop);
736 PARA_EMERG_LOG("terminating on signal %d\n", signum);
739 t->error = -E_AFS_SIGNAL;
742 static void register_signal_task(struct sched *s)
744 struct signal_task *st = &signal_task_struct;
746 para_sigaction(SIGPIPE, SIG_IGN);
747 st->fd = para_signal_init();
748 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
749 para_install_sighandler(SIGINT);
750 para_install_sighandler(SIGTERM);
751 para_install_sighandler(SIGHUP);
753 st->task.pre_select = signal_pre_select;
754 st->task.post_select = afs_signal_post_select;
755 sprintf(st->task.status, "signal task");
756 register_task(s, &st->task);
759 static struct list_head afs_client_list;
761 /** Describes on connected afs client. */
763 /** Position in the afs client list. */
764 struct list_head node;
765 /** The socket file descriptor for this client. */
767 /** The time the client connected. */
768 struct timeval connect_time;
771 static void command_pre_select(struct sched *s, struct task *t)
773 struct command_task *ct = container_of(t, struct command_task, task);
774 struct afs_client *client;
776 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
777 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
778 list_for_each_entry(client, &afs_client_list, node)
779 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
783 * Send data as shared memory to a file descriptor.
785 * \param buf The buffer holding the data to be sent.
786 * \param size The size of \a buf.
787 * \param fd_ptr A pointer to the file descriptor.
789 * This function is used as the \a max_size handler in a \ref para_buffer
790 * structure. If used this way, it is called by \ref para_printf() whenever
791 * the buffer passed to para_printf() is about to exceed its maximal size.
793 * This function creates a shared memory area large enough to hold
794 * the content given by \a buf and \a size and sends the identifier
795 * of this area to the file descriptor given by \a fd_ptr.
797 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
798 * and positive on success.
800 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
802 int ret, shmid, fd = *(int *)fd_ptr;
804 struct callback_result *cr;
808 ret = shm_new(size + sizeof(struct callback_result));
812 ret = shm_attach(shmid, ATTACH_RW, &shm);
816 cr->result_size = size;
817 memcpy(shm + sizeof(*cr), buf, size);
818 ret = shm_detach(shm);
821 ret = write_all(fd, (char *)&shmid, sizeof(int));
825 if (shm_destroy(shmid) < 0)
826 PARA_ERROR_LOG("destroy result failed\n");
831 * On errors, negative value is written to fd.
832 * On success: If query produced a result, the result_shmid is written to fd.
833 * Otherwise, zero is written.
835 static int call_callback(int fd, int query_shmid)
838 struct callback_query *cq;
839 struct osl_object query;
842 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
846 query.data = (char *)query_shm + sizeof(*cq);
847 query.size = cq->query_size;
848 cq->handler(fd, &query);
849 return shm_detach(query_shm);
852 static int execute_server_command(fd_set *rfds)
856 int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
858 if (ret < 0 || n == 0)
861 if (strcmp(buf, "new"))
863 return open_next_audio_file();
866 /* returns 0 if no data available, 1 else */
867 static int execute_afs_command(int fd, fd_set *rfds, uint32_t expected_cookie)
871 char buf[sizeof(cookie) + sizeof(query_shmid)];
873 int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
879 if (n != sizeof(buf)) {
880 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
881 ret, (long unsigned) sizeof(buf));
884 cookie = *(uint32_t *)buf;
885 if (cookie != expected_cookie) {
886 PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
887 (unsigned)cookie, (unsigned)expected_cookie);
890 query_shmid = *(int *)(buf + sizeof(cookie));
891 if (query_shmid < 0) {
892 PARA_WARNING_LOG("received invalid query shmid %d)\n",
896 ret = call_callback(fd, query_shmid);
900 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
904 /** Shutdown connection if query has not arrived until this many seconds. */
905 #define AFS_CLIENT_TIMEOUT 3
907 static void command_post_select(struct sched *s, struct task *t)
909 struct command_task *ct = container_of(t, struct command_task, task);
910 struct sockaddr_un unix_addr;
911 struct afs_client *client, *tmp;
914 ret = execute_server_command(&s->rfds);
916 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
920 /* Check the list of connected clients. */
921 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
922 ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
923 if (ret == 0) { /* prevent bogus connection flooding */
925 tv_diff(now, &client->connect_time, &diff);
926 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
928 PARA_WARNING_LOG("connection timeout\n");
931 list_del(&client->node);
934 /* Accept connections on the local socket. */
935 ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
937 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
940 ret = mark_fd_nonblocking(fd);
942 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
946 client = para_malloc(sizeof(*client));
948 client->connect_time = *now;
949 para_list_add(&client->node, &afs_client_list);
952 static void register_command_task(uint32_t cookie, struct sched *s)
954 struct command_task *ct = &command_task_struct;
955 ct->fd = setup_command_socket_or_die();
958 ct->task.pre_select = command_pre_select;
959 ct->task.post_select = command_post_select;
960 sprintf(ct->task.status, "afs command task");
961 register_task(s, &ct->task);
965 * Initialize the audio file selector process.
967 * \param cookie The value used for "authentication".
968 * \param socket_fd File descriptor used for communication with the server.
970 __noreturn void afs_init(uint32_t cookie, int socket_fd)
972 static struct sched s;
975 register_signal_task(&s);
976 INIT_LIST_HEAD(&afs_client_list);
977 for (i = 0; i < NUM_AFS_TABLES; i++)
978 afs_tables[i].init(&afs_tables[i]);
979 ret = open_afs_tables();
982 server_socket = socket_fd;
983 ret = mark_fd_nonblocking(server_socket);
986 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
987 server_socket, (unsigned) cookie);
988 init_admissible_files(conf.afs_initial_mode_arg);
989 register_command_task(cookie, &s);
990 s.default_timeout.tv_sec = 0;
991 s.default_timeout.tv_usec = 999 * 1000;
997 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1001 static void create_tables_callback(int fd, const struct osl_object *query)
1003 uint32_t table_mask = *(uint32_t *)query->data;
1005 struct para_buffer pb = {.buf = NULL};
1008 for (i = 0; i < NUM_AFS_TABLES; i++) {
1009 struct afs_table *t = &afs_tables[i];
1011 if (!(table_mask & (1 << i)))
1015 ret = t->create(database_dir);
1018 para_printf(&pb, "successfully created %s table\n", t->name);
1020 ret = open_afs_tables();
1023 para_printf(&pb, "%s\n", para_strerror(-ret));
1025 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
1029 int com_init(struct stream_cipher_context *scc, int argc, char * const * const argv)
1032 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1033 struct osl_object query = {.data = &table_mask,
1034 .size = sizeof(table_mask)};
1036 ret = make_database_dir();
1041 for (i = 1; i < argc; i++) {
1042 for (j = 0; j < NUM_AFS_TABLES; j++) {
1043 struct afs_table *t = &afs_tables[j];
1045 if (strcmp(argv[i], t->name))
1047 table_mask |= (1 << j);
1050 if (j == NUM_AFS_TABLES)
1051 return -E_BAD_TABLE_NAME;
1054 ret = send_callback_request(create_tables_callback, &query,
1055 sc_send_result, scc);
1057 /* ignore return value */
1058 sc_send_va_buffer(scc, "%s\n", para_strerror(-ret));
1063 * Flags for the check command.
1067 enum com_check_flags {
1068 /** Check the audio file table. */
1070 /** Check the mood table. */
1072 /** Check the playlist table. */
1076 int com_check(struct stream_cipher_context *scc, int argc, char * const * const argv)
1081 for (i = 1; i < argc; i++) {
1082 const char *arg = argv[i];
1085 if (!strcmp(arg, "--")) {
1089 if (!strcmp(arg, "-a")) {
1093 if (!strcmp(arg, "-p")) {
1094 flags |= CHECK_PLAYLISTS;
1097 if (!strcmp(arg, "-m")) {
1098 flags |= CHECK_MOODS;
1101 return -E_AFS_SYNTAX;
1104 return -E_AFS_SYNTAX;
1107 if (flags & CHECK_AFT) {
1108 ret = send_callback_request(aft_check_callback, NULL,
1109 sc_send_result, scc);
1113 if (flags & CHECK_PLAYLISTS) {
1114 ret = send_callback_request(playlist_check_callback,
1115 NULL, sc_send_result, scc);
1119 if (flags & CHECK_MOODS) {
1120 ret = send_callback_request(mood_check_callback, NULL,
1121 sc_send_result, scc);
1129 * The afs event dispatcher.
1131 * \param event Type of the event.
1132 * \param pb May be \p NULL.
1133 * \param data Type depends on \a event.
1135 * This function calls the table handlers of all tables and passes \a pb and \a
1136 * data verbatim. It's up to the handlers to interpret the \a data pointer.
1138 void afs_event(enum afs_events event, struct para_buffer *pb,
1143 for (i = 0; i < NUM_AFS_TABLES; i++) {
1144 struct afs_table *t = &afs_tables[i];
1145 if (!t->event_handler)
1147 ret = t->event_handler(event, pb, data);
1149 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1150 event, para_strerror(-ret));
1155 * Dummy event handler for the images table.
1157 * \param event Unused.
1159 * \param data Unused.
1161 * \return The images table does not honor events, so this handler always
1164 __a_const int images_event_handler(__a_unused enum afs_events event,
1165 __a_unused struct para_buffer *pb, __a_unused void *data)
1171 * Dummy event handler for the lyrics table.
1173 * \param event Unused.
1175 * \param data Unused.
1177 * \return The lyrics table does not honor events, so this handler always
1180 __a_const int lyrics_event_handler(__a_unused enum afs_events event,
1181 __a_unused struct para_buffer *pb, __a_unused void *data)