X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=afs.c;h=6210358c4ef075ed4bb13680028b27f1ec430123;hp=2b7b9ee9edc54f4b90a9ff85483eb573145df924;hb=5b8e525dfb2f18a4e0d67b9da264259159ad2184;hpb=471684761a2039bbc89aa1e3c33c62de6bef86cf diff --git a/afs.c b/afs.c index 2b7b9ee9..6210358c 100644 --- a/afs.c +++ b/afs.c @@ -1,95 +1,1163 @@ /* - * Copyright (C) 2005-2007 Andre Noll + * Copyright (C) 2007-2008 Andre Noll * * Licensed under the GPL v2. For licencing details see COPYING. */ +/** \file afs.c Paraslash's audio file selector. */ -/** \file afs.c functions common to all audio file selectors */ - +#include +#include #include "server.cmdline.h" -#include "server.h" -#include "vss.h" -#include /* readdir() */ -#include /* stat */ -#include /* mode_t */ +#include "para.h" #include "error.h" #include "string.h" +#include "afh.h" +#include "afs.h" +#include "server.h" +#include /* readdir() */ +#include +#include +#include "net.h" +#include "ipc.h" +#include "list.h" +#include "sched.h" +#include "signal.h" +#include "fd.h" + +/** The osl tables used by afs. \sa blob.c. */ +enum afs_table_num { + /** Contains audio file information. See aft.c. */ + TBLNUM_AUDIO_FILES, + /** The table for the paraslash attributes. See attribute.c. */ + TBLNUM_ATTRIBUTES, + /** + * Paraslash's scoring system is based on Gaussian normal + * distributions, and the relevant data is stored in the rbtrees of an + * osl table containing only volatile columns. See score.c for + * details. + */ + TBLNUM_SCORES, + /** + * A standard blob table containing the mood definitions. For details + * see mood.c. + */ + TBLNUM_MOODS, + /** A blob table containing lyrics on a per-song basis. */ + TBLNUM_LYRICS, + /** Another blob table for images (for example album cover art). */ + TBLNUM_IMAGES, + /** Yet another blob table for storing standard playlists. */ + TBLNUM_PLAYLIST, + /** How many tables are in use? */ + NUM_AFS_TABLES +}; + +static struct afs_table afs_tables[NUM_AFS_TABLES] = { + [TBLNUM_AUDIO_FILES] = {.init = aft_init}, + [TBLNUM_ATTRIBUTES] = {.init = attribute_init}, + [TBLNUM_SCORES] = {.init = score_init}, + [TBLNUM_MOODS] = {.init = moods_init}, + [TBLNUM_LYRICS] = {.init = lyrics_init}, + [TBLNUM_IMAGES] = {.init = images_init}, + [TBLNUM_PLAYLIST] = {.init = playlists_init}, +}; + +struct command_task { + /** The file descriptor for the local socket. */ + int fd; + /** + * Value sent by the command handlers to identify themselves as + * children of the running para_server. + */ + uint32_t cookie; + /** The associated task structure. */ + struct task task; +}; + +extern struct misc_meta_data *mmd; + +static int server_socket; +static struct command_task command_task_struct; +static struct signal_task signal_task_struct; + +static enum play_mode current_play_mode; +static char *current_mop; /* mode or playlist specifier. NULL means dummy mooe */ + /** - * traverse the given directory recursively + * A random number used to "authenticate" the connection. * - * @param dirname the directory to traverse - * @param f: the function to call for each entry. + * para_server picks this number by random before forking the afs process. The + * command handlers write this number together with the id of the shared memory + * area containing the query. This way, a malicious local user has to know this + * number to be able to cause the afs process to crash by sending fake queries. + */ +extern uint32_t afs_socket_cookie; + +/** + * Struct to let command handlers execute a callback in afs context. + * + * Commands that need to change the state of afs can't change the relevant data + * structures directly because commands are executed in a child process, i.e. + * they get their own virtual address space. + * + * This structure is used by \p send_callback_request() (executed from handler + * context) in order to let the afs process call the specified function. An + * instance of that structure is written to a shared memory area together with + * the arguments to the callback function. The identifier of the shared memory + * area is written to the command socket. * - * for each regular file whose filename ends in .yyy, where yyy is a supported - * audio format, the supplied function \a f is called. The directory and - * filename component of the regular file are passed to \a f. + * The afs process accepts connections on the command socket and reads the + * shared memory id, attaches the corresponing area, calls the given handler to + * perform the desired action and to optionally compute a result. * - * \return On success, 1 is returned. Otherwise, this function returns a - * negative value which indicates the kind of the error. + * The result and a \p callback_result structure is then written to another + * shared memory area. The identifier for that area is written to the handler's + * command socket, so that the handler process can read the id, attach the + * shared memory area and use the result. + * + * \sa struct callback_result. */ -int find_audio_files(const char *dirname, int (*f)(const char *, const char *)) -{ - DIR *dir = NULL; - struct dirent *entry; - /* - * Opening the current directory (".") and calling fchdir() to return - * is usually faster and more reliable than saving cwd in some buffer - * and calling chdir() afterwards (see man 3 getcwd). - */ - int cwd_fd = open(".", O_RDONLY); - struct stat s; - int ret = -1; - -// PARA_DEBUG_LOG("dirname: %s\n", dirname); - if (cwd_fd < 0) - return -E_GETCWD; - ret = -E_CHDIR; - if (chdir(dirname) < 0) - goto out; - ret = -E_OPENDIR; - dir = opendir("."); - if (!dir) - goto out; - /* scan cwd recursively */ - while ((entry = readdir(dir))) { - mode_t m; - char *tmp; - - if (!strcmp(entry->d_name, ".")) +struct callback_query { + /** The function to be called. */ + callback_function *handler; + /** The number of bytes of the query */ + size_t query_size; +}; + +/** + * Structure embedded in the result of a callback. + * + * If the callback produced a result, an instance of that structure is embeeded + * into the shared memory area holding the result, mainly to let the command + * handler know the size of the result. + * + * \sa struct callback_query. + */ +struct callback_result { + /** The number of bytes of the result. */ + size_t result_size; +}; + +/** + * Ask the afs process to call a given function. + * + * \param f The function to be called. + * \param query Pointer to arbitrary data for the callback. + * \param result Callback result will be stored here. + * + * This function creates a shared memory area, copies the buffer pointed to by + * query to that area and notifies the afs process that \a f should be + * called ASAP. + * + * \return Negative, on errors, the return value of the callback function + * otherwise. + * + * \sa send_option_arg_callback_request(), send_standard_callback_request(). + */ +int send_callback_request(callback_function *f, struct osl_object *query, + struct osl_object *result) +{ + struct callback_query *cq; + struct callback_result *cr; + int ret, fd = -1, query_shmid, result_shmid; + void *query_shm, *result_shm; + char buf[sizeof(afs_socket_cookie) + sizeof(int)]; + size_t query_shm_size = sizeof(*cq); + + if (query) + query_shm_size += query->size; + ret = shm_new(query_shm_size); + if (ret < 0) + return ret; + query_shmid = ret; + ret = shm_attach(query_shmid, ATTACH_RW, &query_shm); + if (ret < 0) + goto out; + cq = query_shm; + cq->handler = f; + cq->query_size = query_shm_size - sizeof(*cq); + + if (query) + memcpy(query_shm + sizeof(*cq), query->data, query->size); + ret = shm_detach(query_shm); + if (ret < 0) + goto out; + + *(uint32_t *) buf = afs_socket_cookie; + *(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid; + + ret = create_remote_socket(conf.afs_socket_arg); + if (ret < 0) + goto out; + fd = ret; + ret = send_bin_buffer(fd, buf, sizeof(buf)); + if (ret < 0) + goto out; + ret = recv_bin_buffer(fd, buf, sizeof(buf)); + if (ret < 0) + goto out; + if (ret != sizeof(int)) { + ret = -E_AFS_SHORT_READ; + goto out; + } + ret = *(int *) buf; + if (ret <= 0) + goto out; + result_shmid = ret; + ret = shm_attach(result_shmid, ATTACH_RO, &result_shm); + if (ret >= 0) { + assert(result); + cr = result_shm; + result->size = cr->result_size; + result->data = para_malloc(result->size); + memcpy(result->data, result_shm + sizeof(*cr), result->size); + ret = shm_detach(result_shm); + if (ret < 0) + PARA_ERROR_LOG("can not detach result\n"); + } else + PARA_ERROR_LOG("attach result failed: %d\n", ret); + if (shm_destroy(result_shmid) < 0) + PARA_ERROR_LOG("destroy result failed\n"); + ret = 1; +out: + if (shm_destroy(query_shmid) < 0) + PARA_ERROR_LOG("%s\n", "shm destroy error"); + if (fd >= 0) + close(fd); +// PARA_DEBUG_LOG("callback_ret: %d\n", ret); + return ret; +} + +/** + * Send a callback request passing an options structure and an argument vector. + * + * \param options pointer to an arbitrary data structure. + * \param argc Argument count. + * \param argv Standard argument vector. + * \param f The callback function. + * \param result The result of the query is stored here. + * + * Some commands have a couple of options that are parsed in child context for + * syntactic correctness and are stored in a special options structure for that + * command. This function allows to pass such a structure together with a list + * of further arguments (often a list of audio files) to the parent process. + * + * \sa send_standard_callback_request(), send_callback_request(). + */ +int send_option_arg_callback_request(struct osl_object *options, + int argc, char * const * const argv, callback_function *f, + struct osl_object *result) +{ + char *p; + int i, ret; + struct osl_object query = {.size = options? options->size : 0}; + + for (i = 0; i < argc; i++) + query.size += strlen(argv[i]) + 1; + query.data = para_malloc(query.size); + p = query.data; + if (options) { + memcpy(query.data, options->data, options->size); + p += options->size; + } + for (i = 0; i < argc; i++) { + strcpy(p, argv[i]); /* OK */ + p += strlen(argv[i]) + 1; + } + ret = send_callback_request(f, &query, result); + free(query.data); + return ret; +} + +/** + * Send a callback request with an argument vector only. + * + * \param argc The same meaning as in send_option_arg_callback_request(). + * \param argv The same meaning as in send_option_arg_callback_request(). + * \param f The same meaning as in send_option_arg_callback_request(). + * \param result The same meaning as in send_option_arg_callback_request(). + * + * This is similar to send_option_arg_callback_request(), but no options buffer + * is passed to the parent process. + * + * \return The return value of the underlying call to + * send_option_arg_callback_request(). + */ +int send_standard_callback_request(int argc, char * const * const argv, + callback_function *f, struct osl_object *result) +{ + return send_option_arg_callback_request(NULL, argc, argv, f, result); +} + +static int action_if_pattern_matches(struct osl_row *row, void *data) +{ + struct pattern_match_data *pmd = data; + struct osl_object name_obj; + const char *p, *name; + int ret = osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj); + const char *pattern_txt = (const char *)pmd->patterns.data; + + if (ret < 0) + return ret; + name = (char *)name_obj.data; + if ((!name || !*name) && (pmd->pm_flags & PM_SKIP_EMPTY_NAME)) + return 1; + if (!pmd->patterns.size && (pmd->pm_flags & PM_NO_PATTERN_MATCHES_EVERYTHING)) + return pmd->action(pmd->table, row, name, pmd->data); + for (p = pattern_txt; p < pattern_txt + pmd->patterns.size; + p += strlen(p) + 1) { + ret = fnmatch(p, name, pmd->fnmatch_flags); + if (ret == FNM_NOMATCH) + continue; + if (ret) + return -E_FNMATCH; + return pmd->action(pmd->table, row, name, pmd->data); + } + return 1; +} + +/** + * Execute the given function for each matching row. + * + * \param pmd Describes what to match and how. + * + * \return The return value of the underlying call to osl_rbtree_loop() + * or osl_rbtree_loop_reverse(). + */ +int for_each_matching_row(struct pattern_match_data *pmd) +{ + if (pmd->pm_flags & PM_REVERSE_LOOP) + return osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd, + action_if_pattern_matches); + return osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd, + action_if_pattern_matches); +} + +/** + * Compare two osl objects of string type. + * + * \param obj1 Pointer to the first object. + * \param obj2 Pointer to the second object. + * + * In any case, only \p MIN(obj1->size, obj2->size) characters of each string + * are taken into account. + * + * \return It returns an integer less than, equal to, or greater than zero if + * \a obj1 is found, respectively, to be less than, to match, or be greater than + * obj2. + * + * \sa strcmp(3), strncmp(3), osl_compare_func. + */ +int string_compare(const struct osl_object *obj1, const struct osl_object *obj2) +{ + const char *str1 = (const char *)obj1->data; + const char *str2 = (const char *)obj2->data; + return strncmp(str1, str2, PARA_MIN(obj1->size, obj2->size)); +} + +/* + * write input from fd to dynamically allocated buffer, + * but maximal max_size byte. + */ +static int fd2buf(int fd, unsigned max_size, struct osl_object *obj) +{ + const size_t chunk_size = 1024; + size_t size = 2048, received = 0; + int ret; + char *buf = para_malloc(size); + + for (;;) { + ret = recv_bin_buffer(fd, buf + received, chunk_size); + if (ret <= 0) + break; + received += ret; + if (received + chunk_size >= size) { + size *= 2; + ret = -E_INPUT_TOO_LARGE; + if (size > max_size) + break; + buf = para_realloc(buf, size); + } + } + obj->data = buf; + obj->size = received; + if (ret < 0) + free(buf); + return ret; +} + +/** + * Read data from a file descriptor, and send it to the afs process. + * + * \param fd File descriptor to read data from. + * \param arg_obj Pointer to the arguments to \a f. + * \param f The callback function. + * \param max_len Don't read more than that many bytes from stdin. + * \param result The result of the query is stored here. + * + * This function is used by commands that wish to let para_server store + * arbitrary data specified by the user (for instance the add_blob family of + * commands). First, at most \a max_len bytes are read from \a fd, the result + * is concatenated with the buffer given by \a arg_obj, and the combined buffer + * is made available to the parent process via shared memory. + * + * \return Negative on errors, the return value of the underlying call to + * send_callback_request() otherwise. + */ +int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f, + unsigned max_len, struct osl_object *result) +{ + struct osl_object query, stdin_obj; + int ret; + + ret = send_buffer(fd, AWAITING_DATA_MSG); + if (ret < 0) + return ret; + ret = fd2buf(fd, max_len, &stdin_obj); + if (ret < 0) + return ret; + query.size = arg_obj->size + stdin_obj.size; + query.data = para_malloc(query.size); + memcpy(query.data, arg_obj->data, arg_obj->size); + memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size); + free(stdin_obj.data); + ret = send_callback_request(f, &query, result); + free(query.data); + return ret; +} + +static int pass_afd(int fd, char *buf, size_t size) +{ + struct msghdr msg = {.msg_iov = NULL}; + struct cmsghdr *cmsg; + char control[255]; + int ret; + struct iovec iov; + + iov.iov_base = buf; + iov.iov_len = size; + + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + + msg.msg_control = control; + msg.msg_controllen = sizeof(control); + + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + *(int *)CMSG_DATA(cmsg) = fd; + + /* Sum of the length of all control messages in the buffer */ + msg.msg_controllen = cmsg->cmsg_len; + PARA_DEBUG_LOG("passing %zu bytes and fd %d\n", size, fd); + ret = sendmsg(server_socket, &msg, 0); + if (ret < 0) { + ret = -ERRNO_TO_PARA_ERROR(errno); + return ret; + } + return 1; +} + +/** + * Open the audio file with highest score. + * + * This stores all information for streaming the "best" audio file in a shared + * memory area. The id of that area and an open file descriptor for the next + * audio file are passed to the server process. + * + * \return Standard. + * + * \sa open_and_update_audio_file(). + */ +int open_next_audio_file(void) +{ + struct osl_row *aft_row; + struct audio_file_data afd; + int ret, shmid; + char buf[8]; + long score; +again: + PARA_NOTICE_LOG("getting next audio file\n"); + ret = score_get_best(&aft_row, &score); + if (ret < 0) { + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); + goto no_admissible_files; + } + ret = open_and_update_audio_file(aft_row, score, &afd); + if (ret < 0) { + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); + ret = score_delete(aft_row); + if (ret < 0) { + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); + goto no_admissible_files; + } + goto again; + } + shmid = ret; + if (!write_ok(server_socket)) { + ret = -E_AFS_SOCKET; + goto destroy; + } + *(uint32_t *)buf = NEXT_AUDIO_FILE; + *(uint32_t *)(buf + 4) = (uint32_t)shmid; + ret = pass_afd(afd.fd, buf, 8); + close(afd.fd); + if (ret >= 0) + return ret; +destroy: + shm_destroy(shmid); + return ret; +no_admissible_files: + *(uint32_t *)buf = NO_ADMISSIBLE_FILES; + *(uint32_t *)(buf + 4) = (uint32_t)0; + return send_bin_buffer(server_socket, buf, 8); +} + +/* Never fails if arg == NULL */ +static int activate_mood_or_playlist(char *arg, int *num_admissible) +{ + enum play_mode mode; + int ret; + + if (!arg) { + ret = change_current_mood(NULL); /* always successful */ + mode = PLAY_MODE_MOOD; + } else { + if (!strncmp(arg, "p/", 2)) { + ret = playlist_open(arg + 2); + mode = PLAY_MODE_PLAYLIST; + } else if (!strncmp(arg, "m/", 2)) { + ret = change_current_mood(arg + 2); + mode = PLAY_MODE_MOOD; + } else + return -E_AFS_SYNTAX; + if (ret < 0) + return ret; + } + if (num_admissible) + *num_admissible = ret; + current_play_mode = mode; + if (arg != current_mop) { + free(current_mop); + if (arg) { + current_mop = para_strdup(arg); + mmd_lock(); + strncpy(mmd->afs_mode_string, arg, + sizeof(mmd->afs_mode_string)); + mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0'; + mmd_unlock(); + } else { + mmd_lock(); + strcpy(mmd->afs_mode_string, "dummy"); + mmd_unlock(); + current_mop = NULL; + } + } + return 1; +} + +static int com_select_callback(const struct osl_object *query, + struct osl_object *result) +{ + struct para_buffer pb = {.buf = NULL}; + char *arg = query->data; + int num_admissible, ret; + + ret = clear_score_table(); + if (ret < 0) + return ret; + if (current_play_mode == PLAY_MODE_MOOD) + close_current_mood(); + else + playlist_close(); + ret = activate_mood_or_playlist(arg, &num_admissible); + if (ret < 0) { + para_printf(&pb, "%s\n", para_strerror(-ret)); + para_printf(&pb, "switching back to %s\n", current_mop? + current_mop : "dummy"); + ret = activate_mood_or_playlist(current_mop, &num_admissible); + if (ret < 0) { + para_printf(&pb, "failed, switching to dummy\n"); + activate_mood_or_playlist(NULL, &num_admissible); + } + } + para_printf(&pb, "activated %s (%d admissible files)\n", current_mop? + current_mop : "dummy mood", num_admissible); + result->data = pb.buf; + result->size = pb.size; + return 1; +} + +int com_select(int fd, int argc, char * const * const argv) +{ + int ret; + struct osl_object query, result; + + if (argc != 2) + return -E_AFS_SYNTAX; + query.data = argv[1]; + query.size = strlen(argv[1]) + 1; + ret = send_callback_request(com_select_callback, &query, + &result); + if (ret > 0 && result.data && result.size) { + ret = send_va_buffer(fd, "%s", (char *)result.data); + free(result.data); + } + return ret; +} + +static void init_admissible_files(char *arg) +{ + if (activate_mood_or_playlist(arg, NULL) < 0) + activate_mood_or_playlist(NULL, NULL); /* always successful */ +} + +static int setup_command_socket_or_die(void) +{ + int ret, socket_fd; + char *socket_name = conf.afs_socket_arg; + struct sockaddr_un unix_addr; + + unlink(socket_name); + ret = create_local_socket(socket_name, &unix_addr, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH); + if (ret < 0) { + PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name); + exit(EXIT_FAILURE); + } + socket_fd = ret; + if (listen(socket_fd , 5) < 0) { + PARA_EMERG_LOG("can not listen on socket\n"); + exit(EXIT_FAILURE); + } + ret = mark_fd_nonblocking(socket_fd); + if (ret < 0) { + close(socket_fd); + return ret; + } + PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name, + socket_fd); + return socket_fd; +} + +static void close_afs_tables(void) +{ + int i; + PARA_NOTICE_LOG("closing afs_tables\n"); + for (i = 0; i < NUM_AFS_TABLES; i++) + afs_tables[i].close(); +} + +static char *database_dir; + +static void get_database_dir(void) +{ + if (!database_dir) { + if (conf.afs_database_dir_given) + database_dir = para_strdup(conf.afs_database_dir_arg); + else { + char *home = para_homedir(); + database_dir = make_message( + "%s/.paraslash/afs_database", home); + free(home); + } + } + PARA_INFO_LOG("afs_database dir %s\n", database_dir); +} + +static int make_database_dir(void) +{ + int ret; + + get_database_dir(); + ret = para_mkdir(database_dir, 0777); + if (ret >= 0 || is_errno(-ret, EEXIST)) + return 1; + return ret; +} + +static int open_afs_tables(void) +{ + int i, ret; + + get_database_dir(); + PARA_NOTICE_LOG("opening %u osl tables in %s\n", NUM_AFS_TABLES, + database_dir); + for (i = 0; i < NUM_AFS_TABLES; i++) { + ret = afs_tables[i].open(database_dir); + if (ret >= 0) continue; - if (!strcmp(entry->d_name, "..")) + PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name, + para_strerror(-ret)); + break; + } + if (ret >= 0) + return ret; + while (i) + afs_tables[--i].close(); + return ret; +} + +static void unregister_tasks(void) +{ + unregister_task(&command_task_struct.task); + unregister_task(&signal_task_struct.task); +} + +static void signal_pre_select(struct sched *s, struct task *t) +{ + struct signal_task *st = t->private_data; + t->ret = 1; + para_fd_set(st->fd, &s->rfds, &s->max_fileno); +} + +static void signal_post_select(struct sched *s, struct task *t) +{ + struct signal_task *st = t->private_data; + t->ret = -E_AFS_PARENT_DIED; + if (getppid() == 1) + goto err; + t->ret = 1; + if (!FD_ISSET(st->fd, &s->rfds)) + return; + st->signum = para_next_signal(); + t->ret = 1; + if (st->signum == SIGUSR1) + return; /* ignore SIGUSR1 */ + if (st->signum == SIGHUP) { + close_afs_tables(); + t->ret = open_afs_tables(); + if (t->ret < 0) + goto err; + init_admissible_files(current_mop); + return; + } + t->ret = -E_AFS_SIGNAL; +err: + PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret)); + unregister_tasks(); +} + +static void register_signal_task(void) +{ + struct signal_task *st = &signal_task_struct; + st->fd = para_signal_init(); + PARA_INFO_LOG("signal pipe: fd %d\n", st->fd); + para_install_sighandler(SIGINT); + para_install_sighandler(SIGTERM); + para_install_sighandler(SIGPIPE); + para_install_sighandler(SIGHUP); + + st->task.pre_select = signal_pre_select; + st->task.post_select = signal_post_select; + st->task.private_data = st; + sprintf(st->task.status, "signal task"); + register_task(&st->task); +} + +static struct list_head afs_client_list; + +/** Describes on connected afs client. */ +struct afs_client { + /** Position in the afs client list. */ + struct list_head node; + /** The socket file descriptor for this client. */ + int fd; + /** The time the client connected. */ + struct timeval connect_time; +}; + +static void command_pre_select(struct sched *s, struct task *t) +{ + struct command_task *ct = t->private_data; + struct afs_client *client; + + para_fd_set(server_socket, &s->rfds, &s->max_fileno); + para_fd_set(ct->fd, &s->rfds, &s->max_fileno); + list_for_each_entry(client, &afs_client_list, node) + para_fd_set(client->fd, &s->rfds, &s->max_fileno); + t->ret = 1; +} + +/* + * On errors, negative value is written to fd. + * On success: If query produced a result, the result_shmid is written to fd. + * Otherwise, zero is written. + */ +static int call_callback(int fd, int query_shmid) +{ + void *query_shm, *result_shm; + struct callback_query *cq; + struct callback_result *cr; + struct osl_object query, result = {.data = NULL}; + int result_shmid = -1, ret, ret2; + + ret = shm_attach(query_shmid, ATTACH_RW, &query_shm); + if (ret < 0) + goto out; + cq = query_shm; + query.data = (char *)query_shm + sizeof(*cq); + query.size = cq->query_size; + ret = cq->handler(&query, &result); + ret2 = shm_detach(query_shm); + if (ret2 < 0 && ret >= 0) + ret = ret2; + if (ret < 0) + goto out; + ret = 0; + if (!result.data || !result.size) + goto out; + ret = shm_new(result.size + sizeof(struct callback_result)); + if (ret < 0) + goto out; + result_shmid = ret; + ret = shm_attach(result_shmid, ATTACH_RW, &result_shm); + if (ret < 0) + goto out; + cr = result_shm; + cr->result_size = result.size; + memcpy(result_shm + sizeof(*cr), result.data, result.size); + ret = shm_detach(result_shm); + if (ret < 0) + goto out; + ret = result_shmid; +out: + free(result.data); + ret2 = send_bin_buffer(fd, (char *)&ret, sizeof(int)); + if (ret < 0 || ret2 < 0) { + if (result_shmid >= 0) + if (shm_destroy(result_shmid) < 0) + PARA_ERROR_LOG("destroy result failed\n"); + if (ret >= 0) + ret = ret2; + } + return ret; +} + +static void execute_server_command(void) +{ + char buf[8]; + int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1); + + if (ret <= 0) { + if (ret < 0) + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); + return; + } + buf[ret] = '\0'; + PARA_DEBUG_LOG("received: %s\n", buf); + if (!strcmp(buf, "new")) { + ret = open_next_audio_file(); + if (ret < 0) { + PARA_EMERG_LOG("%s\n", para_strerror(-ret)); + unregister_tasks(); + } + return; + } + PARA_ERROR_LOG("unknown command\n"); + +} + +static void execute_afs_command(int fd, uint32_t expected_cookie) +{ + uint32_t cookie; + int query_shmid; + char buf[sizeof(cookie) + sizeof(query_shmid)]; + int ret = recv_bin_buffer(fd, buf, sizeof(buf)); + + if (ret < 0) { + PARA_NOTICE_LOG("%s\n", para_strerror(-ret)); + return; + } + if (ret != sizeof(buf)) { + PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n", + ret, (long unsigned) sizeof(buf)); + return; + } + cookie = *(uint32_t *)buf; + if (cookie != expected_cookie) { + PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n", + (unsigned)cookie, (unsigned)expected_cookie); + return; + } + query_shmid = *(int *)(buf + sizeof(cookie)); + if (query_shmid < 0) { + PARA_WARNING_LOG("received invalid query shmid %d)\n", + query_shmid); + return; + } + /* Ignore return value: Errors might be OK here. */ + call_callback(fd, query_shmid); +} + +/** Shutdown connection if query has not arrived until this many seconds. */ +#define AFS_CLIENT_TIMEOUT 3 + +static void command_post_select(struct sched *s, struct task *t) +{ + struct command_task *ct = t->private_data; + struct sockaddr_un unix_addr; + struct afs_client *client, *tmp; + int fd; + if (FD_ISSET(server_socket, &s->rfds)) + execute_server_command(); + + /* Check the list of connected clients. */ + list_for_each_entry_safe(client, tmp, &afs_client_list, node) { + if (FD_ISSET(client->fd, &s->rfds)) + execute_afs_command(client->fd, ct->cookie); + else { /* prevent bogus connection flooding */ + struct timeval diff; + tv_diff(now, &client->connect_time, &diff); + if (diff.tv_sec < AFS_CLIENT_TIMEOUT) + continue; + PARA_WARNING_LOG("connection timeout\n"); + } + close(client->fd); + list_del(&client->node); + free(client); + } + /* Accept connections on the local socket. */ + if (!FD_ISSET(ct->fd, &s->rfds)) + goto out; + t->ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr)); + if (t->ret < 0) { + PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret)); + goto out; + } + fd = t->ret; + t->ret = mark_fd_nonblocking(fd); + if (t->ret < 0) { + PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret)); + close(fd); + goto out; + } + client = para_malloc(sizeof(*client)); + client->fd = fd; + client->connect_time = *now; + para_list_add(&client->node, &afs_client_list); +out: + t->ret = 1; +} + +static void register_command_task(uint32_t cookie) +{ + struct command_task *ct = &command_task_struct; + ct->fd = setup_command_socket_or_die(); + ct->cookie = cookie; + + ct->task.pre_select = command_pre_select; + ct->task.post_select = command_post_select; + ct->task.private_data = ct; + sprintf(ct->task.status, "command task"); + register_task(&ct->task); +} + +static void register_tasks(uint32_t cookie) +{ + register_signal_task(); + register_command_task(cookie); +} + +/** + * Initialize the audio file selector process. + * + * \param cookie The value used for "authentication". + * \param socket_fd File descriptor used for communication with the server. + */ +__noreturn void afs_init(uint32_t cookie, int socket_fd) +{ + struct sched s; + int i, ret; + + INIT_LIST_HEAD(&afs_client_list); + for (i = 0; i < NUM_AFS_TABLES; i++) + afs_tables[i].init(&afs_tables[i]); + ret = open_afs_tables(); + + if (ret < 0) { + PARA_EMERG_LOG("%s\n", para_strerror(-ret)); + exit(EXIT_FAILURE); + } + server_socket = socket_fd; + ret = mark_fd_nonblocking(server_socket); + if (ret < 0) + exit(EXIT_FAILURE); + PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n", + server_socket, (unsigned) cookie); + init_admissible_files(conf.afs_initial_mode_arg); + register_tasks(cookie); + s.default_timeout.tv_sec = 0; + s.default_timeout.tv_usec = 999 * 1000; + ret = schedule(&s); + if (ret < 0) + PARA_EMERG_LOG("%s\n", para_strerror(-ret)); + close_afs_tables(); + exit(EXIT_FAILURE); +} + +static int create_tables_callback(const struct osl_object *query, + __a_unused struct osl_object *result) +{ + uint32_t table_mask = *(uint32_t *)query->data; + int i, ret; + + close_afs_tables(); + for (i = 0; i < NUM_AFS_TABLES; i++) { + struct afs_table *t = &afs_tables[i]; + + if (!(table_mask & (1 << i))) continue; - ret = -E_LSTAT; - if (lstat(entry->d_name, &s) == -1) + if (!t->create) continue; - m = s.st_mode; - if (!S_ISREG(m) && !S_ISDIR(m)) /* skip links, sockets, ... */ + ret = t->create(database_dir); + if (ret < 0) + return ret; + } + ret = open_afs_tables(); + return ret < 0? ret: 0; +} + +int com_init(int fd, int argc, char * const * const argv) +{ + int i, j, ret; + uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1; + struct osl_object query = {.data = &table_mask, + .size = sizeof(table_mask)}; + + ret = make_database_dir(); + if (ret < 0) + return ret; + if (argc != 1) { + table_mask = 0; + for (i = 1; i < argc; i++) { + for (j = 0; j < NUM_AFS_TABLES; j++) { + struct afs_table *t = &afs_tables[j]; + + if (strcmp(argv[i], t->name)) + continue; + table_mask |= (1 << j); + break; + } + if (j == NUM_AFS_TABLES) + return -E_BAD_TABLE_NAME; + } + } + ret = send_callback_request(create_tables_callback, &query, NULL); + if (ret < 0) + return ret; + return send_va_buffer(fd, "successfully created afs table(s)\n"); +} + +/** + * Flags for the check command. + * + * \sa com_check(). + */ +enum com_check_flags { + /** Check the audio file table. */ + CHECK_AFT = 1, + /** Check the mood table. */ + CHECK_MOODS = 2, + /** Check the playlist table. */ + CHECK_PLAYLISTS = 4 +}; + +int com_check(int fd, int argc, char * const * const argv) +{ + unsigned flags = 0; + int i, ret; + struct osl_object result; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (arg[0] != '-') + break; + if (!strcmp(arg, "--")) { + i++; + break; + } + if (!strcmp(arg, "-a")) { + flags |= CHECK_AFT; continue; - if (S_ISREG(m)) { /* regular file */ - if (guess_audio_format(entry->d_name) < 0) - continue; - ret = f(dirname, entry->d_name); - if (ret < 0) - goto out; + } + if (!strcmp(arg, "-p")) { + flags |= CHECK_PLAYLISTS; + continue; + } + if (!strcmp(arg, "-m")) { + flags |= CHECK_MOODS; continue; } - /* directory */ - tmp = make_message("%s/%s", dirname, entry->d_name); - ret = find_audio_files(tmp, f); - free(tmp); + return -E_AFS_SYNTAX; + } + if (i < argc) + return -E_AFS_SYNTAX; + if (!flags) + flags = ~0U; + if (flags & CHECK_AFT) { + ret = send_callback_request(aft_check_callback, NULL, &result); if (ret < 0) - goto out; + return ret; + if (ret > 0) { + ret = send_buffer(fd, (char *) result.data); + free(result.data); + if (ret < 0) + return ret; + } } - ret = 1; -out: - if (dir) - closedir(dir); - if (fchdir(cwd_fd) < 0) - ret = -E_CHDIR; - close(cwd_fd); - if (ret < 0) - PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret)); - return ret; + if (flags & CHECK_PLAYLISTS) { + ret = send_callback_request(playlist_check_callback, NULL, &result); + if (ret < 0) + return ret; + if (ret > 0) { + ret = send_buffer(fd, (char *) result.data); + free(result.data); + if (ret < 0) + return ret; + } + } + if (flags & CHECK_MOODS) { + ret = send_callback_request(mood_check_callback, NULL, &result); + if (ret < 0) + return ret; + if (ret > 0) { + ret = send_buffer(fd, (char *) result.data); + free(result.data); + if (ret < 0) + return ret; + } + } + return 1; +} + +void afs_event(enum afs_events event, struct para_buffer *pb, + void *data) +{ + int i, ret; + + for (i = 0; i < NUM_AFS_TABLES; i++) { + struct afs_table *t = &afs_tables[i]; + if (!t->event_handler) + continue; + ret = t->event_handler(event, pb, data); + if (ret < 0) + PARA_CRIT_LOG("%s\n", para_strerror(-ret)); + } +} + +int images_event_handler(__a_unused enum afs_events event, + __a_unused struct para_buffer *pb, __a_unused void *data) +{ + return 1; +} + +int lyrics_event_handler(__a_unused enum afs_events event, + __a_unused struct para_buffer *pb, __a_unused void *data) +{ + return 1; }