2 * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.c Paraslash's audio file selector. */
11 #include "server.cmdline.h"
18 #include <dirent.h> /* readdir() */
28 /** The osl tables used by afs. \sa blob.c. */
30 /** Contains audio file information. See aft.c. */
32 /** The table for the paraslash attributes. See attribute.c. */
35 * Paraslash's scoring system is based on Gaussian normal
36 * distributions, and the relevant data is stored in the rbtrees of an
37 * osl table containing only volatile columns. See score.c for
42 * A standard blob table containing the mood definitions. For details
46 /** A blob table containing lyrics on a per-song basis. */
48 /** Another blob table for images (for example album cover art). */
50 /** Yet another blob table for storing standard playlists. */
52 /** How many tables are in use? */
56 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
57 [TBLNUM_AUDIO_FILES] = {.init = aft_init},
58 [TBLNUM_ATTRIBUTES] = {.init = attribute_init},
59 [TBLNUM_SCORES] = {.init = score_init},
60 [TBLNUM_MOODS] = {.init = moods_init},
61 [TBLNUM_LYRICS] = {.init = lyrics_init},
62 [TBLNUM_IMAGES] = {.init = images_init},
63 [TBLNUM_PLAYLIST] = {.init = playlists_init},
67 /** The file descriptor for the local socket. */
70 * Value sent by the command handlers to identify themselves as
71 * children of the running para_server.
74 /** The associated task structure. */
79 extern struct misc_meta_data *mmd;
81 static int server_socket;
82 static struct command_task command_task_struct;
83 static struct signal_task signal_task_struct;
85 static enum play_mode current_play_mode;
86 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
90 * A random number used to "authenticate" the connection.
92 * para_server picks this number by random before forking the afs process. The
93 * command handlers write this number together with the id of the shared memory
94 * area containing the query. This way, a malicious local user has to know this
95 * number to be able to cause the afs process to crash by sending fake queries.
97 extern uint32_t afs_socket_cookie;
100 * Struct to let command handlers execute a callback in afs context.
102 * Commands that need to change the state of afs can't change the relevant data
103 * structures directly because commands are executed in a child process, i.e.
104 * they get their own virtual address space.
106 * This structure is used by \p send_callback_request() (executed from handler
107 * context) in order to let the afs process call the specified function. An
108 * instance of that structure is written to a shared memory area together with
109 * the arguments to the callback function. The identifier of the shared memory
110 * area is written to the command socket.
112 * The afs process accepts connections on the command socket and reads the
113 * shared memory id, attaches the corresponing area, calls the given handler to
114 * perform the desired action and to optionally compute a result.
116 * The result and a \p callback_result structure is then written to another
117 * shared memory area. The identifier for that area is written to the handler's
118 * command socket, so that the handler process can read the id, attach the
119 * shared memory area and use the result.
121 * \sa struct callback_result.
123 struct callback_query {
124 /** The function to be called. */
125 callback_function *handler;
126 /** The number of bytes of the query */
131 * Structure embedded in the result of a callback.
133 * If the callback produced a result, an instance of that structure is embeeded
134 * into the shared memory area holding the result, mainly to let the command
135 * handler know the size of the result.
137 * \sa struct callback_query.
139 struct callback_result {
140 /** The number of bytes of the result. */
144 static int dispatch_result(int result_shmid, callback_result_handler *handler,
145 void *private_result_data)
147 struct osl_object result;
149 int ret2, ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
150 struct callback_result *cr = result_shm;
153 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
156 result.size = cr->result_size;
157 result.data = result_shm + sizeof(*cr);
160 ret = handler(&result, private_result_data);
162 PARA_NOTICE_LOG("result handler error: %s\n",
163 para_strerror(-ret));
165 ret2 = shm_detach(result_shm);
167 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
175 * Ask the afs process to call a given function.
177 * \param f The function to be called.
178 * \param query Pointer to arbitrary data for the callback.
179 * \param result_handler Called for each shm area sent by the callback.
180 * \param private_result_data Passed verbatim to \a result_handler.
182 * This function creates a socket for communication with the afs process and a
183 * shared memory area (sma) to which the buffer pointed to by \a query is
184 * copied. It then notifies the afs process that the callback function \a f
185 * should be executed by sending the shared memory identifier (shmid) to the
188 * If the callback produces a result, it sends any number of shared memory
189 * identifiers back via the socket. For each such identifier received, \a
190 * result_handler is called. The contents of the sma identified by the received
191 * shmid are passed to that function as an osl object. The private_result_data
192 * pointer is passed as the second argument to \a result_handler.
196 * \sa send_option_arg_callback_request(), send_standard_callback_request().
198 int send_callback_request(callback_function *f, struct osl_object *query,
199 callback_result_handler *result_handler,
200 void *private_result_data)
202 struct callback_query *cq;
203 int ret, fd = -1, query_shmid, result_shmid;
205 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
206 size_t query_shm_size = sizeof(*cq);
207 int dispatch_error = 0;
210 query_shm_size += query->size;
211 ret = shm_new(query_shm_size);
215 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
220 cq->query_size = query_shm_size - sizeof(*cq);
223 memcpy(query_shm + sizeof(*cq), query->data, query->size);
224 ret = shm_detach(query_shm);
228 *(uint32_t *) buf = afs_socket_cookie;
229 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
231 ret = create_remote_socket(conf.afs_socket_arg);
235 ret = send_bin_buffer(fd, buf, sizeof(buf));
239 * Read all shmids from afs.
241 * Even if the dispatcher returns an error we _must_ continue to read
242 * shmids from fd so that we can destroy all shared memory areas that
243 * have been created for us by the afs process.
246 ret = recv_bin_buffer(fd, buf, sizeof(int));
249 assert(ret == sizeof(int));
253 if (!dispatch_error) {
254 ret = dispatch_result(result_shmid, result_handler,
255 private_result_data);
259 ret = shm_destroy(result_shmid);
261 PARA_CRIT_LOG("destroy result failed: %s\n",
262 para_strerror(-ret));
265 if (shm_destroy(query_shmid) < 0)
266 PARA_CRIT_LOG("shm destroy error\n");
269 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
274 * Send a callback request passing an options structure and an argument vector.
276 * \param options pointer to an arbitrary data structure.
277 * \param argc Argument count.
278 * \param argv Standard argument vector.
279 * \param f The callback function.
280 * \param result_handler See \ref send_callback_request.
281 * \param private_result_data See \ref send_callback_request.
283 * Some commands have a couple of options that are parsed in child context for
284 * syntactic correctness and are stored in a special options structure for that
285 * command. This function allows to pass such a structure together with a list
286 * of further arguments (often a list of audio files) to the parent process.
288 * \sa send_standard_callback_request(), send_callback_request().
290 int send_option_arg_callback_request(struct osl_object *options,
291 int argc, char * const * const argv, callback_function *f,
292 callback_result_handler *result_handler,
293 void *private_result_data)
297 struct osl_object query = {.size = options? options->size : 0};
299 for (i = 0; i < argc; i++)
300 query.size += strlen(argv[i]) + 1;
301 query.data = para_malloc(query.size);
304 memcpy(query.data, options->data, options->size);
307 for (i = 0; i < argc; i++) {
308 strcpy(p, argv[i]); /* OK */
309 p += strlen(argv[i]) + 1;
311 ret = send_callback_request(f, &query, result_handler,
312 private_result_data);
318 * Send a callback request with an argument vector only.
320 * \param argc The same meaning as in send_option_arg_callback_request().
321 * \param argv The same meaning as in send_option_arg_callback_request().
322 * \param f The same meaning as in send_option_arg_callback_request().
323 * \param result_handler See \ref send_callback_request.
324 * \param private_result_data See \ref send_callback_request.
326 * This is similar to send_option_arg_callback_request(), but no options buffer
327 * is passed to the parent process.
329 * \return The return value of the underlying call to
330 * send_option_arg_callback_request().
332 int send_standard_callback_request(int argc, char * const * const argv,
333 callback_function *f, callback_result_handler *result_handler,
334 void *private_result_data)
336 return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
337 private_result_data);
340 static int action_if_pattern_matches(struct osl_row *row, void *data)
342 struct pattern_match_data *pmd = data;
343 struct osl_object name_obj;
344 const char *p, *name;
345 int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj);
346 const char *pattern_txt = (const char *)pmd->patterns.data;
350 name = (char *)name_obj.data;
351 if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME))
353 if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING))
354 return pmd->action(pmd->table, row, name, pmd->data);
355 for (p = pattern_txt; p < pattern_txt + pmd->patterns.size;
356 p += strlen(p) + 1) {
357 ret = fnmatch(p, name, pmd->fnmatch_flags);
358 if (ret == FNM_NOMATCH)
362 return pmd->action(pmd->table, row, name, pmd->data);
368 * Execute the given function for each matching row.
370 * \param pmd Describes what to match and how.
372 * \return The return value of the underlying call to osl_rbtree_loop()
373 * or osl_rbtree_loop_reverse().
375 int for_each_matching_row(struct pattern_match_data *pmd)
377 if (pmd->pm_flags & PM_REVERSE_LOOP)
378 return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
379 action_if_pattern_matches);
380 return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
381 action_if_pattern_matches);
385 * Compare two osl objects of string type.
387 * \param obj1 Pointer to the first object.
388 * \param obj2 Pointer to the second object.
390 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
391 * are taken into account.
393 * \return It returns an integer less than, equal to, or greater than zero if
394 * \a obj1 is found, respectively, to be less than, to match, or be greater than
397 * \sa strcmp(3), strncmp(3), osl_compare_func.
399 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
401 const char *str1 = (const char *)obj1->data;
402 const char *str2 = (const char *)obj2->data;
403 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
407 * write input from fd to dynamically allocated buffer,
408 * but maximal max_size byte.
410 static int fd2buf(int fd, unsigned max_size, struct osl_object *obj)
412 const size_t chunk_size = 1024;
413 size_t size = 2048, received = 0;
415 char *buf = para_malloc(size);
418 ret = recv_bin_buffer(fd, buf + received, chunk_size);
422 if (received + chunk_size >= size) {
424 ret = -E_INPUT_TOO_LARGE;
427 buf = para_realloc(buf, size);
431 obj->size = received;
438 * Read data from a file descriptor, and send it to the afs process.
440 * \param fd File descriptor to read data from.
441 * \param arg_obj Pointer to the arguments to \a f.
442 * \param f The callback function.
443 * \param max_len Don't read more than that many bytes from stdin.
444 * \param result_handler See \ref send_callback_request.
445 * \param private_result_data See \ref send_callback_request.
447 * This function is used by commands that wish to let para_server store
448 * arbitrary data specified by the user (for instance the add_blob family of
449 * commands). First, at most \a max_len bytes are read from \a fd, the result
450 * is concatenated with the buffer given by \a arg_obj, and the combined buffer
451 * is made available to the afs process via the callback method. See \ref
452 * send_callback_request for details.
454 * \return Negative on errors, the return value of the underlying call to
455 * send_callback_request() otherwise.
457 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
458 unsigned max_len, callback_result_handler *result_handler,
459 void *private_result_data)
461 struct osl_object query, stdin_obj;
464 ret = send_buffer(fd, AWAITING_DATA_MSG);
467 ret = fd2buf(fd, max_len, &stdin_obj);
470 query.size = arg_obj->size + stdin_obj.size;
471 query.data = para_malloc(query.size);
472 memcpy(query.data, arg_obj->data, arg_obj->size);
473 memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
474 free(stdin_obj.data);
475 ret = send_callback_request(f, &query, result_handler, private_result_data);
480 static int pass_afd(int fd, char *buf, size_t size)
482 struct msghdr msg = {.msg_iov = NULL};
483 struct cmsghdr *cmsg;
494 msg.msg_control = control;
495 msg.msg_controllen = sizeof(control);
497 cmsg = CMSG_FIRSTHDR(&msg);
498 cmsg->cmsg_level = SOL_SOCKET;
499 cmsg->cmsg_type = SCM_RIGHTS;
500 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
501 *(int *)CMSG_DATA(cmsg) = fd;
503 /* Sum of the length of all control messages in the buffer */
504 msg.msg_controllen = cmsg->cmsg_len;
505 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
506 ret = sendmsg(server_socket, &msg, 0);
508 ret = -ERRNO_TO_PARA_ERROR(errno);
515 * Open the audio file with highest score.
517 * This stores all information for streaming the "best" audio file in a shared
518 * memory area. The id of that area and an open file descriptor for the next
519 * audio file are passed to the server process.
523 * \sa open_and_update_audio_file().
525 static int open_next_audio_file(void)
527 struct osl_row *aft_row;
528 struct audio_file_data afd;
533 PARA_NOTICE_LOG("getting next audio file\n");
534 ret = score_get_best(&aft_row, &score);
536 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
537 goto no_admissible_files;
539 ret = open_and_update_audio_file(aft_row, score, &afd);
541 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
542 ret = score_delete(aft_row);
544 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
545 goto no_admissible_files;
550 if (!write_ok(server_socket)) {
554 *(uint32_t *)buf = NEXT_AUDIO_FILE;
555 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
556 ret = pass_afd(afd.fd, buf, 8);
564 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
565 *(uint32_t *)(buf + 4) = (uint32_t)0;
566 return send_bin_buffer(server_socket, buf, 8);
569 /* Never fails if arg == NULL */
570 static int activate_mood_or_playlist(char *arg, int *num_admissible)
576 ret = change_current_mood(NULL); /* always successful */
577 mode = PLAY_MODE_MOOD;
579 if (!strncmp(arg, "p/", 2)) {
580 ret = playlist_open(arg + 2);
581 mode = PLAY_MODE_PLAYLIST;
582 } else if (!strncmp(arg, "m/", 2)) {
583 ret = change_current_mood(arg + 2);
584 mode = PLAY_MODE_MOOD;
586 return -E_AFS_SYNTAX;
591 *num_admissible = ret;
592 current_play_mode = mode;
593 if (arg != current_mop) {
596 current_mop = para_strdup(arg);
597 mutex_lock(mmd_mutex);
598 strncpy(mmd->afs_mode_string, arg,
599 sizeof(mmd->afs_mode_string));
600 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
601 mutex_unlock(mmd_mutex);
603 mutex_lock(mmd_mutex);
604 strcpy(mmd->afs_mode_string, "dummy");
605 mutex_unlock(mmd_mutex);
612 static void com_select_callback(int fd, const struct osl_object *query)
614 struct para_buffer pb = {
617 .max_size_handler = pass_buffer_as_shm
619 char *arg = query->data;
620 int num_admissible, ret, ret2;
622 ret = clear_score_table();
624 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
627 if (current_play_mode == PLAY_MODE_MOOD)
628 close_current_mood();
631 ret = activate_mood_or_playlist(arg, &num_admissible);
633 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
634 para_strerror(-ret), current_mop?
635 current_mop : "dummy");
636 ret = activate_mood_or_playlist(current_mop, &num_admissible);
639 ret2 = para_printf(&pb, "failed, switching to dummy\n");
640 activate_mood_or_playlist(NULL, &num_admissible);
643 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
644 current_mop : "dummy mood", num_admissible);
646 if (ret2 >= 0 && pb.offset)
647 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
652 * Result handler for sending data to the para_client process.
654 * \param result The data to be sent.
655 * \param fd_ptr Pointer to the file descriptor.
657 * \return The return value of the underlying call to send_bin_buffer().
659 * \sa \ref callback_result_handler.
661 int send_result(struct osl_object *result, void *fd_ptr)
663 int fd = *(int *)fd_ptr;
666 return send_bin_buffer(fd, result->data, result->size);
669 int com_select(int fd, int argc, char * const * const argv)
671 struct osl_object query;
674 return -E_AFS_SYNTAX;
675 query.data = argv[1];
676 query.size = strlen(argv[1]) + 1;
677 return send_callback_request(com_select_callback, &query,
681 static void init_admissible_files(char *arg)
683 if (activate_mood_or_playlist(arg, NULL) < 0)
684 activate_mood_or_playlist(NULL, NULL); /* always successful */
687 static int setup_command_socket_or_die(void)
690 char *socket_name = conf.afs_socket_arg;
691 struct sockaddr_un unix_addr;
694 ret = create_local_socket(socket_name, &unix_addr,
695 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
697 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
701 if (listen(socket_fd , 5) < 0) {
702 PARA_EMERG_LOG("can not listen on socket\n");
705 ret = mark_fd_nonblocking(socket_fd);
710 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
715 static void close_afs_tables(void)
718 PARA_NOTICE_LOG("closing afs_tables\n");
719 for (i = 0; i < NUM_AFS_TABLES; i++)
720 afs_tables[i].close();
723 static char *database_dir;
725 static void get_database_dir(void)
728 if (conf.afs_database_dir_given)
729 database_dir = para_strdup(conf.afs_database_dir_arg);
731 char *home = para_homedir();
732 database_dir = make_message(
733 "%s/.paraslash/afs_database", home);
737 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
740 static int make_database_dir(void)
745 ret = para_mkdir(database_dir, 0777);
746 if (ret >= 0 || is_errno(-ret, EEXIST))
751 static int open_afs_tables(void)
756 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
758 for (i = 0; i < NUM_AFS_TABLES; i++) {
759 ret = afs_tables[i].open(database_dir);
762 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
763 para_strerror(-ret));
769 afs_tables[--i].close();
773 static void signal_pre_select(struct sched *s, struct task *t)
775 struct signal_task *st = container_of(t, struct signal_task, task);
776 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
779 static void afs_signal_post_select(struct sched *s, struct task *t)
781 struct signal_task *st = container_of(t, struct signal_task, task);
782 if (getppid() == 1) {
783 PARA_EMERG_LOG("para_server died\n");
786 if (!FD_ISSET(st->fd, &s->rfds))
788 st->signum = para_next_signal();
789 if (st->signum == SIGHUP) {
791 parse_config_or_die(1);
792 t->error = open_afs_tables();
795 init_admissible_files(current_mop);
798 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
801 t->error = -E_AFS_SIGNAL;
804 static void register_signal_task(void)
806 struct signal_task *st = &signal_task_struct;
808 para_sigaction(SIGPIPE, SIG_IGN);
809 st->fd = para_signal_init();
810 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
811 para_install_sighandler(SIGINT);
812 para_install_sighandler(SIGTERM);
813 para_install_sighandler(SIGHUP);
815 st->task.pre_select = signal_pre_select;
816 st->task.post_select = afs_signal_post_select;
817 sprintf(st->task.status, "signal task");
818 register_task(&st->task);
821 static struct list_head afs_client_list;
823 /** Describes on connected afs client. */
825 /** Position in the afs client list. */
826 struct list_head node;
827 /** The socket file descriptor for this client. */
829 /** The time the client connected. */
830 struct timeval connect_time;
833 static void command_pre_select(struct sched *s, struct task *t)
835 struct command_task *ct = container_of(t, struct command_task, task);
836 struct afs_client *client;
838 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
839 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
840 list_for_each_entry(client, &afs_client_list, node)
841 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
845 * Send data as shared memory to a file descriptor.
847 * \param buf The buffer holding the data to be sent.
848 * \param size The size of \a buf.
849 * \param fd_ptr A pointer to the file descriptor.
851 * This function is used as the \a max_size handler in a \ref para_buffer
852 * structure. If used this way, it is called by \ref para_printf() whenever
853 * the buffer passed to para_printf() is about to exceed its maximal size.
855 * This function creates a shared memory area large enough to hold
856 * the content given by \a buf and \a size and sends the identifier
857 * of this area to the file descriptor given by \a fd_ptr.
859 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
860 * and positive on success.
862 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
864 int ret, shmid, fd = *(int *)fd_ptr;
866 struct callback_result *cr;
870 ret = shm_new(size + sizeof(struct callback_result));
874 ret = shm_attach(shmid, ATTACH_RW, &shm);
878 cr->result_size = size;
879 memcpy(shm + sizeof(*cr), buf, size);
880 ret = shm_detach(shm);
883 ret = send_bin_buffer(fd, (char *)&shmid, sizeof(int));
887 if (shm_destroy(shmid) < 0)
888 PARA_ERROR_LOG("destroy result failed\n");
893 * On errors, negative value is written to fd.
894 * On success: If query produced a result, the result_shmid is written to fd.
895 * Otherwise, zero is written.
897 static int call_callback(int fd, int query_shmid)
900 struct callback_query *cq;
901 struct osl_object query;
904 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
908 query.data = (char *)query_shm + sizeof(*cq);
909 query.size = cq->query_size;
910 cq->handler(fd, &query);
911 return shm_detach(query_shm);
914 static int execute_server_command(void)
917 int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1);
921 ret = -ERRNO_TO_PARA_ERROR(ECONNRESET);
925 PARA_DEBUG_LOG("received: %s\n", buf);
927 if (strcmp(buf, "new"))
929 ret = open_next_audio_file();
934 static void execute_afs_command(int fd, uint32_t expected_cookie)
938 char buf[sizeof(cookie) + sizeof(query_shmid)];
939 int ret = recv_bin_buffer(fd, buf, sizeof(buf));
943 if (ret != sizeof(buf)) {
944 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
945 ret, (long unsigned) sizeof(buf));
948 cookie = *(uint32_t *)buf;
949 if (cookie != expected_cookie) {
950 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
951 (unsigned)cookie, (unsigned)expected_cookie);
954 query_shmid = *(int *)(buf + sizeof(cookie));
955 if (query_shmid < 0) {
956 PARA_WARNING_LOG("received invalid query shmid %d)\n",
960 ret = call_callback(fd, query_shmid);
964 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
967 /** Shutdown connection if query has not arrived until this many seconds. */
968 #define AFS_CLIENT_TIMEOUT 3
970 static void command_post_select(struct sched *s, struct task *t)
972 struct command_task *ct = container_of(t, struct command_task, task);
973 struct sockaddr_un unix_addr;
974 struct afs_client *client, *tmp;
977 if (FD_ISSET(server_socket, &s->rfds)) {
978 ret = execute_server_command();
980 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
986 /* Check the list of connected clients. */
987 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
988 if (FD_ISSET(client->fd, &s->rfds))
989 execute_afs_command(client->fd, ct->cookie);
990 else { /* prevent bogus connection flooding */
992 tv_diff(now, &client->connect_time, &diff);
993 if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
995 PARA_WARNING_LOG("connection timeout\n");
998 list_del(&client->node);
1001 /* Accept connections on the local socket. */
1002 if (!FD_ISSET(ct->fd, &s->rfds))
1004 ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
1006 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1010 ret = mark_fd_nonblocking(fd);
1012 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1016 client = para_malloc(sizeof(*client));
1018 client->connect_time = *now;
1019 para_list_add(&client->node, &afs_client_list);
1022 static void register_command_task(uint32_t cookie)
1024 struct command_task *ct = &command_task_struct;
1025 ct->fd = setup_command_socket_or_die();
1026 ct->cookie = cookie;
1028 ct->task.pre_select = command_pre_select;
1029 ct->task.post_select = command_post_select;
1030 sprintf(ct->task.status, "command task");
1031 register_task(&ct->task);
1035 * Initialize the audio file selector process.
1037 * \param cookie The value used for "authentication".
1038 * \param socket_fd File descriptor used for communication with the server.
1040 __noreturn void afs_init(uint32_t cookie, int socket_fd)
1042 static struct sched s;
1045 register_signal_task();
1046 INIT_LIST_HEAD(&afs_client_list);
1047 for (i = 0; i < NUM_AFS_TABLES; i++)
1048 afs_tables[i].init(&afs_tables[i]);
1049 ret = open_afs_tables();
1052 server_socket = socket_fd;
1053 ret = mark_fd_nonblocking(server_socket);
1056 PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
1057 server_socket, (unsigned) cookie);
1058 init_admissible_files(conf.afs_initial_mode_arg);
1059 register_command_task(cookie);
1060 s.default_timeout.tv_sec = 0;
1061 s.default_timeout.tv_usec = 999 * 1000;
1067 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1071 static void create_tables_callback(int fd, const struct osl_object *query)
1073 uint32_t table_mask = *(uint32_t *)query->data;
1078 for (i = 0; i < NUM_AFS_TABLES; i++) {
1079 struct afs_table *t = &afs_tables[i];
1081 if (!(table_mask & (1 << i)))
1085 ret = t->create(database_dir);
1089 ret = open_afs_tables();
1092 buf = make_message("successfully created afs table(s)\n");
1094 buf = make_message("%s\n", para_strerror(-ret));
1095 pass_buffer_as_shm(buf, strlen(buf), &fd);
1099 int com_init(int fd, int argc, char * const * const argv)
1102 uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
1103 struct osl_object query = {.data = &table_mask,
1104 .size = sizeof(table_mask)};
1106 ret = make_database_dir();
1111 for (i = 1; i < argc; i++) {
1112 for (j = 0; j < NUM_AFS_TABLES; j++) {
1113 struct afs_table *t = &afs_tables[j];
1115 if (strcmp(argv[i], t->name))
1117 table_mask |= (1 << j);
1120 if (j == NUM_AFS_TABLES)
1121 return -E_BAD_TABLE_NAME;
1124 ret = send_callback_request(create_tables_callback, &query, &send_result, &fd);
1126 return send_va_buffer(fd, "%s\n", para_strerror(-ret));
1131 * Flags for the check command.
1135 enum com_check_flags {
1136 /** Check the audio file table. */
1138 /** Check the mood table. */
1140 /** Check the playlist table. */
1144 int com_check(int fd, int argc, char * const * const argv)
1149 for (i = 1; i < argc; i++) {
1150 const char *arg = argv[i];
1153 if (!strcmp(arg, "--")) {
1157 if (!strcmp(arg, "-a")) {
1161 if (!strcmp(arg, "-p")) {
1162 flags |= CHECK_PLAYLISTS;
1165 if (!strcmp(arg, "-m")) {
1166 flags |= CHECK_MOODS;
1169 return -E_AFS_SYNTAX;
1172 return -E_AFS_SYNTAX;
1175 if (flags & CHECK_AFT) {
1176 ret = send_callback_request(aft_check_callback, NULL, send_result, &fd);
1180 if (flags & CHECK_PLAYLISTS) {
1181 ret = send_callback_request(playlist_check_callback, NULL, send_result, &fd);
1185 if (flags & CHECK_MOODS) {
1186 ret = send_callback_request(mood_check_callback, NULL, send_result, &fd);
1194 * The afs event dispatcher.
1196 * \param event Type of the event.
1197 * \param pb May be \p NULL.
1198 * \param data Type depends on \a event.
1200 * This function calls the table handlers of all tables and passes \a pb and \a
1201 * data verbatim. It's up to the handlers to interpret the \a data pointer.
1203 void afs_event(enum afs_events event, struct para_buffer *pb,
1208 for (i = 0; i < NUM_AFS_TABLES; i++) {
1209 struct afs_table *t = &afs_tables[i];
1210 if (!t->event_handler)
1212 ret = t->event_handler(event, pb, data);
1214 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1215 event, para_strerror(-ret));
1219 int images_event_handler(__a_unused enum afs_events event,
1220 __a_unused struct para_buffer *pb, __a_unused void *data)
1225 int lyrics_event_handler(__a_unused enum afs_events event,
1226 __a_unused struct para_buffer *pb, __a_unused void *data)