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. */
78 extern struct misc_meta_data *mmd;
80 static int server_socket;
81 static struct command_task command_task_struct;
82 static struct signal_task signal_task_struct;
84 static enum play_mode current_play_mode;
85 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
89 * A random number used to "authenticate" the connection.
91 * para_server picks this number by random before forking the afs process. The
92 * command handlers write this number together with the id of the shared memory
93 * area containing the query. This way, a malicious local user has to know this
94 * number to be able to cause the afs process to crash by sending fake queries.
96 extern uint32_t afs_socket_cookie;
99 * Struct to let command handlers execute a callback in afs context.
101 * Commands that need to change the state of afs can't change the relevant data
102 * structures directly because commands are executed in a child process, i.e.
103 * they get their own virtual address space.
105 * This structure is used by \p send_callback_request() (executed from handler
106 * context) in order to let the afs process call the specified function. An
107 * instance of that structure is written to a shared memory area together with
108 * the arguments to the callback function. The identifier of the shared memory
109 * area is written to the command socket.
111 * The afs process accepts connections on the command socket and reads the
112 * shared memory id, attaches the corresponing area, calls the given handler to
113 * perform the desired action and to optionally compute a result.
115 * The result and a \p callback_result structure is then written to another
116 * shared memory area. The identifier for that area is written to the handler's
117 * command socket, so that the handler process can read the id, attach the
118 * shared memory area and use the result.
120 * \sa struct callback_result.
122 struct callback_query {
123 /** The function to be called. */
124 callback_function *handler;
125 /** The number of bytes of the query */
130 * Structure embedded in the result of a callback.
132 * If the callback produced a result, an instance of that structure is embeeded
133 * into the shared memory area holding the result, mainly to let the command
134 * handler know the size of the result.
136 * \sa struct callback_query.
138 struct callback_result {
139 /** The number of bytes of the result. */
144 * Ask the afs process to call a given function.
146 * \param f The function to be called.
147 * \param query Pointer to arbitrary data for the callback.
148 * \param result_handler Called for each shm area sent by the callback.
149 * \param private_result_data Passed verbatim to \a result_handler.
151 * This function creates a socket for communication with the afs process and a
152 * shared memory area (sma) to which the buffer pointed to by \a query is
153 * copied. It then notifies the afs process that the callback function \a f
154 * should be executed by sending the shared memory identifier (shmid) to the
157 * If the callback produces a result, it sends any number of shared memory
158 * identifiers back via the socket. For each such identifier received, \a
159 * result_handler is called. The contents of the sma identified by the received
160 * shmid are passed to that function as an osl object. The private_result_data
161 * pointer is passed as the second argument to \a result_handler.
163 * \return Negative, on errors, the return value of the callback function
166 * \sa send_option_arg_callback_request(), send_standard_callback_request().
168 int send_callback_request(callback_function *f, struct osl_object *query,
169 callback_result_handler *result_handler,
170 void *private_result_data)
172 struct callback_query *cq;
173 int num_results = 0, ret, fd = -1, query_shmid, result_shmid;
174 void *query_shm, *result_shm;
175 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
176 size_t query_shm_size = sizeof(*cq);
179 query_shm_size += query->size;
180 ret = shm_new(query_shm_size);
184 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
189 cq->query_size = query_shm_size - sizeof(*cq);
192 memcpy(query_shm + sizeof(*cq), query->data, query->size);
193 ret = shm_detach(query_shm);
197 *(uint32_t *) buf = afs_socket_cookie;
198 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
200 ret = create_remote_socket(conf.afs_socket_arg);
204 ret = send_bin_buffer(fd, buf, sizeof(buf));
208 ret = recv_bin_buffer(fd, buf, sizeof(int));
211 if (ret != sizeof(int)) {
212 ret = -E_AFS_SHORT_READ;
219 ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
221 struct callback_result *cr = result_shm;
222 struct osl_object result;
224 result.size = cr->result_size;
225 result.data = result_shm + sizeof(*cr);
227 assert(result_handler);
228 ret = result_handler(&result, private_result_data);
229 if (shm_detach(result_shm) < 0)
230 PARA_ERROR_LOG("can not detach result\n");
233 PARA_ERROR_LOG("attach result failed: %d\n", ret);
234 if (shm_destroy(result_shmid) < 0)
235 PARA_ERROR_LOG("destroy result failed\n");
240 if (shm_destroy(query_shmid) < 0)
241 PARA_ERROR_LOG("%s\n", "shm destroy error");
246 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
251 * Send a callback request passing an options structure and an argument vector.
253 * \param options pointer to an arbitrary data structure.
254 * \param argc Argument count.
255 * \param argv Standard argument vector.
256 * \param f The callback function.
257 * \param result_handler See \ref send_callback_request.
258 * \param private_result_data See \ref send_callback_request.
260 * Some commands have a couple of options that are parsed in child context for
261 * syntactic correctness and are stored in a special options structure for that
262 * command. This function allows to pass such a structure together with a list
263 * of further arguments (often a list of audio files) to the parent process.
265 * \sa send_standard_callback_request(), send_callback_request().
267 int send_option_arg_callback_request(struct osl_object *options,
268 int argc, char * const * const argv, callback_function *f,
269 callback_result_handler *result_handler,
270 void *private_result_data)
274 struct osl_object query = {.size = options? options->size : 0};
276 for (i = 0; i < argc; i++)
277 query.size += strlen(argv[i]) + 1;
278 query.data = para_malloc(query.size);
281 memcpy(query.data, options->data, options->size);
284 for (i = 0; i < argc; i++) {
285 strcpy(p, argv[i]); /* OK */
286 p += strlen(argv[i]) + 1;
288 ret = send_callback_request(f, &query, result_handler,
289 private_result_data);
295 * Send a callback request with an argument vector only.
297 * \param argc The same meaning as in send_option_arg_callback_request().
298 * \param argv The same meaning as in send_option_arg_callback_request().
299 * \param f The same meaning as in send_option_arg_callback_request().
300 * \param result_handler See \ref send_callback_request.
301 * \param private_result_data See \ref send_callback_request.
303 * This is similar to send_option_arg_callback_request(), but no options buffer
304 * is passed to the parent process.
306 * \return The return value of the underlying call to
307 * send_option_arg_callback_request().
309 int send_standard_callback_request(int argc, char * const * const argv,
310 callback_function *f, callback_result_handler *result_handler,
311 void *private_result_data)
313 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
314 private_result_data);
317 static int action_if_pattern_matches(struct osl_row *row, void *data)
319 struct pattern_match_data *pmd = data;
320 struct osl_object name_obj;
321 const char *p, *name;
322 int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
323 const char *pattern_txt = (const char *)pmd->patterns.data;
327 name = (char *)name_obj.data;
328 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
330 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
331 return pmd->action(pmd->table, row, name, pmd->data);
332 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
333 p += strlen(p) + 1) {
334 ret = fnmatch(p, name, pmd->fnmatch_flags);
335 if (ret == FNM_NOMATCH)
339 return pmd->action(pmd->table, row, name, pmd->data);
345 * Execute the given function for each matching row.
347 * \param pmd Describes what to match and how.
349 * \return The return value of the underlying call to osl_rbtree_loop()
350 * or osl_rbtree_loop_reverse().
352 int for_each_matching_row(struct pattern_match_data *pmd)
354 if (pmd->pm_flags & PM_REVERSE_LOOP)
355 return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
356 action_if_pattern_matches);
357 return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
358 action_if_pattern_matches);
362 * Compare two osl objects of string type.
364 * \param obj1 Pointer to the first object.
365 * \param obj2 Pointer to the second object.
367 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
368 * are taken into account.
370 * \return It returns an integer less than, equal to, or greater than zero if
371 * \a obj1 is found, respectively, to be less than, to match, or be greater than
374 * \sa strcmp(3), strncmp(3), osl_compare_func.
376 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
378 const char *str1 = (const char *)obj1->data;
379 const char *str2 = (const char *)obj2->data;
380 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
384 * write input from fd to dynamically allocated buffer,
385 * but maximal max_size byte.
387 static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
389 const size_t chunk_size = 1024;
390 size_t size = 2048, received = 0;
392 char *buf = para_malloc(size);
395 ret = recv_bin_buffer(fd, buf + received, chunk_size);
399 if (received + chunk_size >= size) {
401 ret = -E_INPUT_TOO_LARGE;
404 buf = para_realloc(buf, size);
408 obj->size = received;
415 * Read data from a file descriptor, and send it to the afs process.
417 * \param fd File descriptor to read data from.
418 * \param arg_obj Pointer to the arguments to \a f.
419 * \param f The callback function.
420 * \param max_len Don't read more than that many bytes from stdin.
421 * \param result_handler See \ref send_callback_request.
422 * \param private_result_data See \ref send_callback_request.
424 * This function is used by commands that wish to let para_server store
425 * arbitrary data specified by the user (for instance the add_blob family of
426 * commands). First, at most \a max_len bytes are read from \a fd, the result
427 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
428 * is made available to the afs process via the callback method. See \ref
429 * send_callback_request for details.
431 * \return Negative on errors, the return value of the underlying call to
432 * send_callback_request() otherwise.
434 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
435 unsigned max_len, callback_result_handler *result_handler,
436 void *private_result_data)
438 struct osl_object query, stdin_obj;
441 ret = send_buffer(fd, AWAITING_DATA_MSG);
444 ret = fd2buf(fd, max_len, &stdin_obj);
447 query.size = arg_obj->size + stdin_obj.size;
448 query.data = para_malloc(query.size);
449 memcpy(query.data, arg_obj->data, arg_obj->size);
450 memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
451 free(stdin_obj.data);
452 ret = send_callback_request(f, &query, result_handler, private_result_data);
457 static int pass_afd(int fd, char *buf, size_t size)
459 struct msghdr msg = {.msg_iov = NULL};
460 struct cmsghdr *cmsg;
471 msg.msg_control = control;
472 msg.msg_controllen = sizeof(control);
474 cmsg = CMSG_FIRSTHDR(&msg);
475 cmsg->cmsg_level = SOL_SOCKET;
476 cmsg->cmsg_type = SCM_RIGHTS;
477 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
478 *(int *)CMSG_DATA(cmsg) = fd;
480 /* Sum of the length of all control messages in the buffer */
481 msg.msg_controllen = cmsg->cmsg_len;
482 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
483 ret = sendmsg(server_socket, &msg, 0);
485 ret = -ERRNO_TO_PARA_ERROR(errno);
492 * Open the audio file with highest score.
494 * This stores all information for streaming the "best" audio file in a shared
495 * memory area. The id of that area and an open file descriptor for the next
496 * audio file are passed to the server process.
500 * \sa open_and_update_audio_file().
502 int open_next_audio_file(void)
504 struct osl_row *aft_row;
505 struct audio_file_data afd;
510 PARA_NOTICE_LOG("getting next audio file\n");
511 ret = score_get_best(&aft_row, &score);
513 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
514 goto no_admissible_files;
516 ret = open_and_update_audio_file(aft_row, score, &afd);
518 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
519 ret = score_delete(aft_row);
521 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
522 goto no_admissible_files;
527 if (!write_ok(server_socket)) {
531 *(uint32_t *)buf = NEXT_AUDIO_FILE;
532 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
533 ret = pass_afd(afd.fd, buf, 8);
541 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
542 *(uint32_t *)(buf + 4) = (uint32_t)0;
543 return send_bin_buffer(server_socket, buf, 8);
546 /* Never fails if arg == NULL */
547 static int activate_mood_or_playlist(char *arg, int *num_admissible)
553 ret = change_current_mood(NULL); /* always successful */
554 mode = PLAY_MODE_MOOD;
556 if (!strncmp(arg, "p/", 2)) {
557 ret = playlist_open(arg + 2);
558 mode = PLAY_MODE_PLAYLIST;
559 } else if (!strncmp(arg, "m/", 2)) {
560 ret = change_current_mood(arg + 2);
561 mode = PLAY_MODE_MOOD;
563 return -E_AFS_SYNTAX;
568 *num_admissible = ret;
569 current_play_mode = mode;
570 if (arg != current_mop) {
573 current_mop = para_strdup(arg);
575 strncpy(mmd->afs_mode_string, arg,
576 sizeof(mmd->afs_mode_string));
577 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
581 strcpy(mmd->afs_mode_string, "dummy");
589 static void com_select_callback(int fd, const struct osl_object *query)
591 struct para_buffer pb = {
594 .max_size_handler = pass_buffer_as_shm
596 char *arg = query->data;
597 int num_admissible, ret, ret2;
599 ret = clear_score_table();
601 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
604 if (current_play_mode == PLAY_MODE_MOOD)
605 close_current_mood();
608 ret = activate_mood_or_playlist(arg, &num_admissible);
610 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
611 para_strerror(-ret), current_mop?
612 current_mop : "dummy");
613 ret = activate_mood_or_playlist(current_mop, &num_admissible);
616 ret2 = para_printf(&pb, "failed, switching to dummy\n");
617 activate_mood_or_playlist(NULL, &num_admissible);
620 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
621 current_mop : "dummy mood", num_admissible);
623 if (ret2 >= 0 && pb.offset)
624 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
629 * Result handler for sending data to the para_client process.
631 * \param result The data to be sent.
632 * \param fd_ptr Pointer to the file descriptor.
634 * \return The return value of the underlying call to send_bin_buffer().
636 * \sa \ref callback_result_handler.
638 int send_result(struct osl_object *result, void *fd_ptr)
640 int fd = *(int *)fd_ptr;
643 return send_bin_buffer(fd, result->data, result->size);
646 int com_select(int fd, int argc, char * const * const argv)
648 struct osl_object query;
651 return -E_AFS_SYNTAX;
652 query.data = argv[1];
653 query.size = strlen(argv[1]) + 1;
654 return send_callback_request(com_select_callback, &query,
658 static void init_admissible_files(char *arg)
660 if (activate_mood_or_playlist(arg, NULL) < 0)
661 activate_mood_or_playlist(NULL, NULL); /* always successful */
664 static int setup_command_socket_or_die(void)
667 char *socket_name = conf.afs_socket_arg;
668 struct sockaddr_un unix_addr;
671 ret = create_local_socket(socket_name, &unix_addr,
672 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
674 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
678 if (listen(socket_fd , 5) < 0) {
679 PARA_EMERG_LOG("can not listen on socket\n");
682 ret = mark_fd_nonblocking(socket_fd);
687 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
692 static void close_afs_tables(void)
695 PARA_NOTICE_LOG("closing afs_tables\n");
696 for (i = 0; i < NUM_AFS_TABLES; i++)
697 afs_tables[i].close();
700 static char *database_dir;
702 static void get_database_dir(void)
705 if (conf.afs_database_dir_given)
706 database_dir = para_strdup(conf.afs_database_dir_arg);
708 char *home = para_homedir();
709 database_dir = make_message(
710 "%s/.paraslash/afs_database", home);
714 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
717 static int make_database_dir(void)
722 ret = para_mkdir(database_dir, 0777);
723 if (ret >= 0 || is_errno(-ret, EEXIST))
728 static int open_afs_tables(void)
733 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
735 for (i = 0; i < NUM_AFS_TABLES; i++) {
736 ret = afs_tables[i].open(database_dir);
739 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
740 para_strerror(-ret));
746 afs_tables[--i].close();
750 static void unregister_tasks(void)
752 unregister_task(&command_task_struct.task);
753 unregister_task(&signal_task_struct.task);
756 static void signal_pre_select(struct sched *s, struct task *t)
758 struct signal_task *st = t->private_data;
760 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
763 static void signal_post_select(struct sched *s, struct task *t)
765 struct signal_task *st = t->private_data;
766 t->ret = -E_AFS_PARENT_DIED;
770 if (!FD_ISSET(st->fd, &s->rfds))
772 st->signum = para_next_signal();
774 if (st->signum == SIGHUP) {
776 t->ret = open_afs_tables();
779 init_admissible_files(current_mop);
782 t->ret = -E_AFS_SIGNAL;
784 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
788 static void register_signal_task(void)
790 struct signal_task *st = &signal_task_struct;
792 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
793 PARA_EMERG_LOG("failed to ignore SIGPIPE\n");
796 if (signal(SIGUSR1, SIG_IGN) == SIG_ERR) {
797 PARA_EMERG_LOG("failed to ignore SIGUSR1\n");
800 st->fd = para_signal_init();
801 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
802 para_install_sighandler(SIGINT);
803 para_install_sighandler(SIGTERM);
804 para_install_sighandler(SIGHUP);
806 st->task.pre_select = signal_pre_select;
807 st->task.post_select = signal_post_select;
808 st->task.private_data = st;
809 sprintf(st->task.status, "signal task");
810 register_task(&st->task);
813 static struct list_head afs_client_list;
815 /** Describes on connected afs client. */
817 /** Position in the afs client list. */
818 struct list_head node;
819 /** The socket file descriptor for this client. */
821 /** The time the client connected. */
822 struct timeval connect_time;
825 static void command_pre_select(struct sched *s, struct task *t)
827 struct command_task *ct = t->private_data;
828 struct afs_client *client;
830 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
831 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
832 list_for_each_entry(client, &afs_client_list, node)
833 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
838 * Send data as shared memory to a file descriptor.
840 * \param buf The buffer holding the data to be sent.
841 * \param size The size of \a buf.
842 * \param fd_ptr A pointer to the file descriptor.
844 * This function is used as the \a max_size handler in a \ref para_buffer
845 * structure. If used this way, it is called by \ref para_printf() whenever
846 * the buffer passed to para_printf() is about to exceed its maximal size.
848 * This function creates a shared memory area large enough to hold
849 * the content given by \a buf and \a size and sends the identifier
850 * of this area to the file descriptor given by \a fd_ptr.
852 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
853 * and positive on success.
855 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
857 int ret, shmid, fd = *(int *)fd_ptr;
859 struct callback_result *cr;
863 ret = shm_new(size + sizeof(struct callback_result));
867 ret = shm_attach(shmid, ATTACH_RW, &shm);
871 cr->result_size = size;
872 memcpy(shm + sizeof(*cr), buf, size);
873 ret = shm_detach(shm);
876 ret = send_bin_buffer(fd, (char *)&shmid, sizeof(int));
880 if (shm_destroy(shmid) < 0)
881 PARA_ERROR_LOG("destroy result failed\n");
886 * On errors, negative value is written to fd.
887 * On success: If query produced a result, the result_shmid is written to fd.
888 * Otherwise, zero is written.
890 static int call_callback(int fd, int query_shmid)
893 struct callback_query *cq;
894 struct osl_object query;
897 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
901 query.data = (char *)query_shm + sizeof(*cq);
902 query.size = cq->query_size;
903 cq->handler(fd, &query);
907 static void execute_server_command(void)
910 int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1);
914 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
918 PARA_DEBUG_LOG("received: %s\n", buf);
919 if (!strcmp(buf, "new")) {
920 ret = open_next_audio_file();
922 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
927 PARA_ERROR_LOG("unknown command\n");
931 static void execute_afs_command(int fd, uint32_t expected_cookie)
935 char buf[sizeof(cookie) + sizeof(query_shmid)];
936 int ret = recv_bin_buffer(fd, buf, sizeof(buf));
940 if (ret != sizeof(buf)) {
941 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
942 ret, (long unsigned) sizeof(buf));
945 cookie = *(uint32_t *)buf;
946 if (cookie != expected_cookie) {
947 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
948 (unsigned)cookie, (unsigned)expected_cookie);
951 query_shmid = *(int *)(buf + sizeof(cookie));
952 if (query_shmid < 0) {
953 PARA_WARNING_LOG("received invalid query shmid %d)\n",
957 ret = call_callback(fd, query_shmid);
961 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
964 /** Shutdown connection if query has not arrived until this many seconds. */
965 #define AFS_CLIENT_TIMEOUT 3
967 static void command_post_select(struct sched *s, struct task *t)
969 struct command_task *ct = t->private_data;
970 struct sockaddr_un unix_addr;
971 struct afs_client *client, *tmp;
973 if (FD_ISSET(server_socket, &s->rfds))
974 execute_server_command();
976 /* Check the list of connected clients. */
977 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
978 if (FD_ISSET(client->fd, &s->rfds))
979 execute_afs_command(client->fd, ct->cookie);
980 else { /* prevent bogus connection flooding */
982 tv_diff(now, &client->connect_time, &diff);
983 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
985 PARA_WARNING_LOG("connection timeout\n");
988 list_del(&client->node);
991 /* Accept connections on the local socket. */
992 if (!FD_ISSET(ct->fd, &s->rfds))
994 t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
996 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
1000 t->ret = mark_fd_nonblocking(fd);
1002 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
1006 client = para_malloc(sizeof(*client));
1008 client->connect_time = *now;
1009 para_list_add(&client->node, &afs_client_list);
1014 static void register_command_task(uint32_t cookie)
1016 struct command_task *ct = &command_task_struct;
1017 ct->fd = setup_command_socket_or_die();
1018 ct->cookie = cookie;
1020 ct->task.pre_select = command_pre_select;
1021 ct->task.post_select = command_post_select;
1022 ct->task.private_data = ct;
1023 sprintf(ct->task.status, "command task");
1024 register_task(&ct->task);
1028 * Initialize the audio file selector process.
1030 * \param cookie The value used for "authentication".
1031 * \param socket_fd File descriptor used for communication with the server.
1033 __noreturn void afs_init(uint32_t cookie, int socket_fd)
1038 register_signal_task();
1039 INIT_LIST_HEAD(&afs_client_list);
1040 for (i = 0; i < NUM_AFS_TABLES; i++)
1041 afs_tables[i].init(&afs_tables[i]);
1042 ret = open_afs_tables();
1045 server_socket = socket_fd;
1046 ret = mark_fd_nonblocking(server_socket);
1049 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1050 server_socket, (unsigned) cookie);
1051 init_admissible_files(conf.afs_initial_mode_arg);
1052 register_command_task(cookie);
1053 s.default_timeout.tv_sec = 0;
1054 s.default_timeout.tv_usec = 999 * 1000;
1060 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1064 static void create_tables_callback(int fd, const struct osl_object *query)
1066 uint32_t table_mask = *(uint32_t *)query->data;
1071 for (i = 0; i < NUM_AFS_TABLES; i++) {
1072 struct afs_table *t = &afs_tables[i];
1074 if (!(table_mask & (1 << i)))
1078 ret = t->create(database_dir);
1082 ret = open_afs_tables();
1085 buf = make_message("successfully created afs table(s)\n");
1087 buf = make_message("%s\n", para_strerror(-ret));
1088 pass_buffer_as_shm(buf, strlen(buf), &fd);
1092 int com_init(int fd, int argc, char * const * const argv)
1095 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1096 struct osl_object query = {.data = &table_mask,
1097 .size = sizeof(table_mask)};
1099 ret = make_database_dir();
1104 for (i = 1; i < argc; i++) {
1105 for (j = 0; j < NUM_AFS_TABLES; j++) {
1106 struct afs_table *t = &afs_tables[j];
1108 if (strcmp(argv[i], t->name))
1110 table_mask |= (1 << j);
1113 if (j == NUM_AFS_TABLES)
1114 return -E_BAD_TABLE_NAME;
1117 ret = send_callback_request(create_tables_callback, &query, NULL, NULL);
1119 return send_va_buffer(fd, "%s\n", para_strerror(-ret));
1124 * Flags for the check command.
1128 enum com_check_flags {
1129 /** Check the audio file table. */
1131 /** Check the mood table. */
1133 /** Check the playlist table. */
1137 int com_check(int fd, int argc, char * const * const argv)
1142 for (i = 1; i < argc; i++) {
1143 const char *arg = argv[i];
1146 if (!strcmp(arg, "--")) {
1150 if (!strcmp(arg, "-a")) {
1154 if (!strcmp(arg, "-p")) {
1155 flags |= CHECK_PLAYLISTS;
1158 if (!strcmp(arg, "-m")) {
1159 flags |= CHECK_MOODS;
1162 return -E_AFS_SYNTAX;
1165 return -E_AFS_SYNTAX;
1168 if (flags & CHECK_AFT) {
1169 ret = send_callback_request(aft_check_callback, NULL, send_result, &fd);
1173 if (flags & CHECK_PLAYLISTS) {
1174 ret = send_callback_request(playlist_check_callback, NULL, send_result, &fd);
1178 if (flags & CHECK_MOODS) {
1179 ret = send_callback_request(mood_check_callback, NULL, send_result, &fd);
1186 void afs_event(enum afs_events event, struct para_buffer *pb,
1191 for (i = 0; i < NUM_AFS_TABLES; i++) {
1192 struct afs_table *t = &afs_tables[i];
1193 if (!t->event_handler)
1195 ret = t->event_handler(event, pb, data);
1197 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
1201 int images_event_handler(__a_unused enum afs_events event,
1202 __a_unused struct para_buffer *pb, __a_unused void *data)
1207 int lyrics_event_handler(__a_unused enum afs_events event,
1208 __a_unused struct para_buffer *pb, __a_unused void *data)