2 * Copyright (C) 2007-2010 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. */
12 #include <openssl/rc4.h>
15 #include "server.cmdline.h"
23 #include <dirent.h> /* readdir() */
34 /** The osl tables used by afs. \sa blob.c. */
36 /** Contains audio file information. See aft.c. */
38 /** The table for the paraslash attributes. See attribute.c. */
41 * Paraslash's scoring system is based on Gaussian normal
42 * distributions, and the relevant data is stored in the rbtrees of an
43 * osl table containing only volatile columns. See score.c for
48 * A standard blob table containing the mood definitions. For details
52 /** A blob table containing lyrics on a per-song basis. */
54 /** Another blob table for images (for example album cover art). */
56 /** Yet another blob table for storing standard playlists. */
58 /** How many tables are in use? */
62 static struct afs_table afs_tables[NUM_AFS_TABLES] = {
63 [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
64 [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
65 [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
66 [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
67 [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
68 [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
69 [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
73 /** The file descriptor for the local socket. */
76 * Value sent by the command handlers to identify themselves as
77 * children of the running para_server.
80 /** The associated task structure. */
85 extern struct misc_meta_data *mmd;
87 static int server_socket;
88 static struct command_task command_task_struct;
89 static struct signal_task signal_task_struct;
91 static enum play_mode current_play_mode;
92 static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */
95 * A random number used to "authenticate" the connection.
97 * para_server picks this number by random before forking the afs process. The
98 * command handlers write this number together with the id of the shared memory
99 * area containing the query. This way, a malicious local user has to know this
100 * number to be able to cause the afs process to crash by sending fake queries.
102 extern uint32_t afs_socket_cookie;
105 * Struct to let command handlers execute a callback in afs context.
107 * Commands that need to change the state of afs can't change the relevant data
108 * structures directly because commands are executed in a child process, i.e.
109 * they get their own virtual address space.
111 * This structure is used by \p send_callback_request() (executed from handler
112 * context) in order to let the afs process call the specified function. An
113 * instance of that structure is written to a shared memory area together with
114 * the arguments to the callback function. The identifier of the shared memory
115 * area is written to the command socket.
117 * The afs process accepts connections on the command socket and reads the
118 * shared memory id, attaches the corresponing area, calls the given handler to
119 * perform the desired action and to optionally compute a result.
121 * The result and a \p callback_result structure is then written to another
122 * shared memory area. The identifier for that area is written to the handler's
123 * command socket, so that the handler process can read the id, attach the
124 * shared memory area and use the result.
126 * \sa struct callback_result.
128 struct callback_query {
129 /** The function to be called. */
130 callback_function *handler;
131 /** The number of bytes of the query */
136 * Structure embedded in the result of a callback.
138 * If the callback produced a result, an instance of that structure is embeeded
139 * into the shared memory area holding the result, mainly to let the command
140 * handler know the size of the result.
142 * \sa struct callback_query.
144 struct callback_result {
145 /** The number of bytes of the result. */
149 static int dispatch_result(int result_shmid, callback_result_handler *handler,
150 void *private_result_data)
152 struct osl_object result;
154 int ret2, ret = shm_attach(result_shmid, ATTACH_RO, &result_shm);
155 struct callback_result *cr = result_shm;
158 PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
161 result.size = cr->result_size;
162 result.data = result_shm + sizeof(*cr);
165 ret = handler(&result, private_result_data);
167 PARA_NOTICE_LOG("result handler error: %s\n",
168 para_strerror(-ret));
170 ret2 = shm_detach(result_shm);
172 PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
180 * Ask the afs process to call a given function.
182 * \param f The function to be called.
183 * \param query Pointer to arbitrary data for the callback.
184 * \param result_handler Called for each shm area sent by the callback.
185 * \param private_result_data Passed verbatim to \a result_handler.
187 * This function creates a socket for communication with the afs process and a
188 * shared memory area (sma) to which the buffer pointed to by \a query is
189 * copied. It then notifies the afs process that the callback function \a f
190 * should be executed by sending the shared memory identifier (shmid) to the
193 * If the callback produces a result, it sends any number of shared memory
194 * identifiers back via the socket. For each such identifier received, \a
195 * result_handler is called. The contents of the sma identified by the received
196 * shmid are passed to that function as an osl object. The private_result_data
197 * pointer is passed as the second argument to \a result_handler.
201 * \sa send_option_arg_callback_request(), send_standard_callback_request().
203 int send_callback_request(callback_function *f, struct osl_object *query,
204 callback_result_handler *result_handler,
205 void *private_result_data)
207 struct callback_query *cq;
208 int ret, fd = -1, query_shmid, result_shmid;
210 char buf[sizeof(afs_socket_cookie) + sizeof(int)];
211 size_t query_shm_size = sizeof(*cq);
212 int dispatch_error = 0;
215 query_shm_size += query->size;
216 ret = shm_new(query_shm_size);
220 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
225 cq->query_size = query_shm_size - sizeof(*cq);
228 memcpy(query_shm + sizeof(*cq), query->data, query->size);
229 ret = shm_detach(query_shm);
233 *(uint32_t *) buf = afs_socket_cookie;
234 *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
236 ret = create_remote_socket(conf.afs_socket_arg);
240 ret = send_bin_buffer(fd, buf, sizeof(buf));
244 * Read all shmids from afs.
246 * Even if the dispatcher returns an error we _must_ continue to read
247 * shmids from fd so that we can destroy all shared memory areas that
248 * have been created for us by the afs process.
251 ret = recv_bin_buffer(fd, buf, sizeof(int));
254 assert(ret == sizeof(int));
258 if (!dispatch_error) {
259 ret = dispatch_result(result_shmid, result_handler,
260 private_result_data);
264 ret = shm_destroy(result_shmid);
266 PARA_CRIT_LOG("destroy result failed: %s\n",
267 para_strerror(-ret));
270 if (shm_destroy(query_shmid) < 0)
271 PARA_CRIT_LOG("shm destroy error\n");
274 // PARA_DEBUG_LOG("callback_ret: %d\n", ret);
279 * Send a callback request passing an options structure and an argument vector.
281 * \param options pointer to an arbitrary data structure.
282 * \param argc Argument count.
283 * \param argv Standard argument vector.
284 * \param f The callback function.
285 * \param result_handler See \ref send_callback_request.
286 * \param private_result_data See \ref send_callback_request.
288 * Some commands have a couple of options that are parsed in child context for
289 * syntactic correctness and are stored in a special options structure for that
290 * command. This function allows to pass such a structure together with a list
291 * of further arguments (often a list of audio files) to the parent process.
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 return pmd->action(pmd->table, row, name, pmd->data);
373 * Execute the given function for each matching row.
375 * \param pmd Describes what to match and how.
379 int for_each_matching_row(struct pattern_match_data *pmd)
381 if (pmd->pm_flags & PM_REVERSE_LOOP)
382 return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
383 action_if_pattern_matches));
384 return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
385 action_if_pattern_matches));
389 * Compare two osl objects of string type.
391 * \param obj1 Pointer to the first object.
392 * \param obj2 Pointer to the second object.
394 * In any case, only \p MIN(obj1->size, obj2->size) characters of each string
395 * are taken into account.
397 * \return It returns an integer less than, equal to, or greater than zero if
398 * \a obj1 is found, respectively, to be less than, to match, or be greater than
401 * \sa strcmp(3), strncmp(3), osl_compare_func.
403 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2)
405 const char *str1 = (const char *)obj1->data;
406 const char *str2 = (const char *)obj2->data;
407 return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size));
410 static int pass_afd(int fd, char *buf, size_t size)
412 struct msghdr msg = {.msg_iov = NULL};
413 struct cmsghdr *cmsg;
424 msg.msg_control = control;
425 msg.msg_controllen = sizeof(control);
427 cmsg = CMSG_FIRSTHDR(&msg);
428 cmsg->cmsg_level = SOL_SOCKET;
429 cmsg->cmsg_type = SCM_RIGHTS;
430 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
431 *(int *)CMSG_DATA(cmsg) = fd;
433 /* Sum of the length of all control messages in the buffer */
434 msg.msg_controllen = cmsg->cmsg_len;
435 PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd);
436 ret = sendmsg(server_socket, &msg, 0);
438 ret = -ERRNO_TO_PARA_ERROR(errno);
445 * Open the audio file with highest score.
447 * This stores all information for streaming the "best" audio file in a shared
448 * memory area. The id of that area and an open file descriptor for the next
449 * audio file are passed to the server process.
453 * \sa open_and_update_audio_file().
455 static int open_next_audio_file(void)
457 struct osl_row *aft_row;
458 struct audio_file_data afd;
463 PARA_NOTICE_LOG("getting next audio file\n");
464 ret = score_get_best(&aft_row, &score);
466 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
467 goto no_admissible_files;
469 ret = open_and_update_audio_file(aft_row, score, &afd);
471 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
472 ret = score_delete(aft_row);
474 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
475 goto no_admissible_files;
480 if (!write_ok(server_socket)) {
484 *(uint32_t *)buf = NEXT_AUDIO_FILE;
485 *(uint32_t *)(buf + 4) = (uint32_t)shmid;
486 ret = pass_afd(afd.fd, buf, 8);
494 *(uint32_t *)buf = NO_ADMISSIBLE_FILES;
495 *(uint32_t *)(buf + 4) = (uint32_t)0;
496 return send_bin_buffer(server_socket, buf, 8);
499 /* Never fails if arg == NULL */
500 static int activate_mood_or_playlist(char *arg, int *num_admissible)
506 ret = change_current_mood(NULL); /* always successful */
507 mode = PLAY_MODE_MOOD;
509 if (!strncmp(arg, "p/", 2)) {
510 ret = playlist_open(arg + 2);
511 mode = PLAY_MODE_PLAYLIST;
512 } else if (!strncmp(arg, "m/", 2)) {
513 ret = change_current_mood(arg + 2);
514 mode = PLAY_MODE_MOOD;
516 return -E_AFS_SYNTAX;
521 *num_admissible = ret;
522 current_play_mode = mode;
523 if (arg != current_mop) {
526 current_mop = para_strdup(arg);
527 mutex_lock(mmd_mutex);
528 strncpy(mmd->afs_mode_string, arg,
529 sizeof(mmd->afs_mode_string));
530 mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
531 mutex_unlock(mmd_mutex);
533 mutex_lock(mmd_mutex);
534 strcpy(mmd->afs_mode_string, "dummy");
535 mutex_unlock(mmd_mutex);
542 static void com_select_callback(int fd, const struct osl_object *query)
544 struct para_buffer pb = {
547 .max_size_handler = pass_buffer_as_shm
549 char *arg = query->data;
550 int num_admissible, ret, ret2;
552 ret = clear_score_table();
554 ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
557 if (current_play_mode == PLAY_MODE_MOOD)
558 close_current_mood();
561 ret = activate_mood_or_playlist(arg, &num_admissible);
563 ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
564 para_strerror(-ret), current_mop?
565 current_mop : "dummy");
566 ret = activate_mood_or_playlist(current_mop, &num_admissible);
569 ret2 = para_printf(&pb, "failed, switching to dummy\n");
570 activate_mood_or_playlist(NULL, &num_admissible);
573 ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
574 current_mop : "dummy mood", num_admissible);
576 if (ret2 >= 0 && pb.offset)
577 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
582 * Result handler for sending data to the para_client process.
584 * \param result The data to be sent.
585 * \param private Pointer to rc4 context.
587 * \return The return value of the underlying call to rc4_send_bin_buffer().
589 * \sa \ref callback_result_handler, \ref rc4_send_bin_buffer().
591 int rc4_send_result(struct osl_object *result, void *private)
593 struct rc4_context *rc4c = private;
597 return rc4_send_bin_buffer(rc4c, result->data, result->size);
600 int com_select(struct rc4_context *rc4c, int argc, char * const * const argv)
602 struct osl_object query;
605 return -E_AFS_SYNTAX;
606 query.data = argv[1];
607 query.size = strlen(argv[1]) + 1;
608 return send_callback_request(com_select_callback, &query,
609 &rc4_send_result, rc4c);
612 static void init_admissible_files(char *arg)
614 if (activate_mood_or_playlist(arg, NULL) < 0)
615 activate_mood_or_playlist(NULL, NULL); /* always successful */
618 static int setup_command_socket_or_die(void)
621 char *socket_name = conf.afs_socket_arg;
622 struct sockaddr_un unix_addr;
625 ret = create_local_socket(socket_name, &unix_addr,
626 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
628 PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
632 if (listen(socket_fd , 5) < 0) {
633 PARA_EMERG_LOG("can not listen on socket\n");
636 ret = mark_fd_nonblocking(socket_fd);
641 PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
646 static void close_afs_tables(void)
649 PARA_NOTICE_LOG("closing afs_tables\n");
650 for (i = 0; i < NUM_AFS_TABLES; i++)
651 afs_tables[i].close();
654 static char *database_dir;
656 static void get_database_dir(void)
659 if (conf.afs_database_dir_given)
660 database_dir = para_strdup(conf.afs_database_dir_arg);
662 char *home = para_homedir();
663 database_dir = make_message(
664 "%s/.paraslash/afs_database-0.4", home);
668 PARA_INFO_LOG("afs_database dir %s\n", database_dir);
671 static int make_database_dir(void)
676 ret = para_mkdir(database_dir, 0777);
677 if (ret >= 0 || is_errno(-ret, EEXIST))
682 static int open_afs_tables(void)
687 PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES,
689 for (i = 0; i < NUM_AFS_TABLES; i++) {
690 ret = afs_tables[i].open(database_dir);
693 PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
694 para_strerror(-ret));
700 afs_tables[--i].close();
704 static void signal_pre_select(struct sched *s, struct task *t)
706 struct signal_task *st = container_of(t, struct signal_task, task);
707 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
710 static void afs_signal_post_select(struct sched *s, struct task *t)
712 struct signal_task *st = container_of(t, struct signal_task, task);
715 if (getppid() == 1) {
716 PARA_EMERG_LOG("para_server died\n");
719 if (!FD_ISSET(st->fd, &s->rfds))
721 signum = para_next_signal();
722 if (signum == SIGHUP) {
724 parse_config_or_die(1);
725 t->error = open_afs_tables();
728 init_admissible_files(current_mop);
731 PARA_EMERG_LOG("terminating on signal %d\n", signum);
734 t->error = -E_AFS_SIGNAL;
737 static void register_signal_task(void)
739 struct signal_task *st = &signal_task_struct;
741 para_sigaction(SIGPIPE, SIG_IGN);
742 st->fd = para_signal_init();
743 PARA_INFO_LOG("signal pipe: fd %d\n", st->fd);
744 para_install_sighandler(SIGINT);
745 para_install_sighandler(SIGTERM);
746 para_install_sighandler(SIGHUP);
748 st->task.pre_select = signal_pre_select;
749 st->task.post_select = afs_signal_post_select;
750 sprintf(st->task.status, "signal task");
751 register_task(&st->task);
754 static struct list_head afs_client_list;
756 /** Describes on connected afs client. */
758 /** Position in the afs client list. */
759 struct list_head node;
760 /** The socket file descriptor for this client. */
762 /** The time the client connected. */
763 struct timeval connect_time;
766 static void command_pre_select(struct sched *s, struct task *t)
768 struct command_task *ct = container_of(t, struct command_task, task);
769 struct afs_client *client;
771 para_fd_set(server_socket, &s->rfds, &s->max_fileno);
772 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
773 list_for_each_entry(client, &afs_client_list, node)
774 para_fd_set(client->fd, &s->rfds, &s->max_fileno);
778 * Send data as shared memory to a file descriptor.
780 * \param buf The buffer holding the data to be sent.
781 * \param size The size of \a buf.
782 * \param fd_ptr A pointer to the file descriptor.
784 * This function is used as the \a max_size handler in a \ref para_buffer
785 * structure. If used this way, it is called by \ref para_printf() whenever
786 * the buffer passed to para_printf() is about to exceed its maximal size.
788 * This function creates a shared memory area large enough to hold
789 * the content given by \a buf and \a size and sends the identifier
790 * of this area to the file descriptor given by \a fd_ptr.
792 * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
793 * and positive on success.
795 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
797 int ret, shmid, fd = *(int *)fd_ptr;
799 struct callback_result *cr;
803 ret = shm_new(size + sizeof(struct callback_result));
807 ret = shm_attach(shmid, ATTACH_RW, &shm);
811 cr->result_size = size;
812 memcpy(shm + sizeof(*cr), buf, size);
813 ret = shm_detach(shm);
816 ret = send_bin_buffer(fd, (char *)&shmid, sizeof(int));
820 if (shm_destroy(shmid) < 0)
821 PARA_ERROR_LOG("destroy result failed\n");
826 * On errors, negative value is written to fd.
827 * On success: If query produced a result, the result_shmid is written to fd.
828 * Otherwise, zero is written.
830 static int call_callback(int fd, int query_shmid)
833 struct callback_query *cq;
834 struct osl_object query;
837 ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
841 query.data = (char *)query_shm + sizeof(*cq);
842 query.size = cq->query_size;
843 cq->handler(fd, &query);
844 return shm_detach(query_shm);
847 static int execute_server_command(void)
850 int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1);
854 ret = -ERRNO_TO_PARA_ERROR(ECONNRESET);
858 PARA_DEBUG_LOG("received: %s\n", buf);
860 if (strcmp(buf, "new"))
862 ret = open_next_audio_file();
867 static void execute_afs_command(int fd, uint32_t expected_cookie)
871 char buf[sizeof(cookie) + sizeof(query_shmid)];
872 int ret = recv_bin_buffer(fd, buf, sizeof(buf));
876 if (ret != sizeof(buf)) {
877 PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
878 ret, (long unsigned) sizeof(buf));
881 cookie = *(uint32_t *)buf;
882 if (cookie != expected_cookie) {
883 PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
884 (unsigned)cookie, (unsigned)expected_cookie);
887 query_shmid = *(int *)(buf + sizeof(cookie));
888 if (query_shmid < 0) {
889 PARA_WARNING_LOG("received invalid query shmid %d)\n",
893 ret = call_callback(fd, query_shmid);
897 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
900 /** Shutdown connection if query has not arrived until this many seconds. */
901 #define AFS_CLIENT_TIMEOUT 3
903 static void command_post_select(struct sched *s, struct task *t)
905 struct command_task *ct = container_of(t, struct command_task, task);
906 struct sockaddr_un unix_addr;
907 struct afs_client *client, *tmp;
910 if (FD_ISSET(server_socket, &s->rfds)) {
911 ret = execute_server_command();
913 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
919 /* Check the list of connected clients. */
920 list_for_each_entry_safe(client, tmp, &afs_client_list, node) {
921 if (FD_ISSET(client->fd, &s->rfds))
922 execute_afs_command(client->fd, ct->cookie);
923 else { /* 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)
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, "command task");
961 register_task(&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();
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);
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 rc4_context *rc4c, 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 rc4_send_result, rc4c);
1057 return rc4_send_va_buffer(rc4c, "%s\n", para_strerror(-ret));
1062 * Flags for the check command.
1066 enum com_check_flags {
1067 /** Check the audio file table. */
1069 /** Check the mood table. */
1071 /** Check the playlist table. */
1075 int com_check(struct rc4_context *rc4c, int argc, char * const * const argv)
1080 for (i = 1; i < argc; i++) {
1081 const char *arg = argv[i];
1084 if (!strcmp(arg, "--")) {
1088 if (!strcmp(arg, "-a")) {
1092 if (!strcmp(arg, "-p")) {
1093 flags |= CHECK_PLAYLISTS;
1096 if (!strcmp(arg, "-m")) {
1097 flags |= CHECK_MOODS;
1100 return -E_AFS_SYNTAX;
1103 return -E_AFS_SYNTAX;
1106 if (flags & CHECK_AFT) {
1107 ret = send_callback_request(aft_check_callback, NULL,
1108 rc4_send_result, rc4c);
1112 if (flags & CHECK_PLAYLISTS) {
1113 ret = send_callback_request(playlist_check_callback,
1114 NULL, rc4_send_result, rc4c);
1118 if (flags & CHECK_MOODS) {
1119 ret = send_callback_request(mood_check_callback, NULL,
1120 rc4_send_result, rc4c);
1128 * The afs event dispatcher.
1130 * \param event Type of the event.
1131 * \param pb May be \p NULL.
1132 * \param data Type depends on \a event.
1134 * This function calls the table handlers of all tables and passes \a pb and \a
1135 * data verbatim. It's up to the handlers to interpret the \a data pointer.
1137 void afs_event(enum afs_events event, struct para_buffer *pb,
1142 for (i = 0; i < NUM_AFS_TABLES; i++) {
1143 struct afs_table *t = &afs_tables[i];
1144 if (!t->event_handler)
1146 ret = t->event_handler(event, pb, data);
1148 PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
1149 event, para_strerror(-ret));
1154 * Dummy event handler for the images table.
1156 * \param event Unused.
1158 * \param data Unused.
1160 * This table does not honor events.
1162 int images_event_handler(__a_unused enum afs_events event,
1163 __a_unused struct para_buffer *pb, __a_unused void *data)
1169 * Dummy event handler for the lyrics table.
1171 * \param event Unused.
1173 * \param data Unused.
1175 * This table does not honor events.
1177 int lyrics_event_handler(__a_unused enum afs_events event,
1178 __a_unused struct para_buffer *pb, __a_unused void *data)