/*
- * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * 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 <signal.h>
+#include <fnmatch.h>
#include "server.cmdline.h"
-#include "server.h"
-#include "vss.h"
-#include <dirent.h> /* readdir() */
-#include <sys/stat.h> /* stat */
-#include <sys/types.h> /* mode_t */
+#include "para.h"
#include "error.h"
#include "string.h"
+#include "afh.h"
+#include "afs.h"
+#include "server.h"
+#include <dirent.h> /* readdir() */
+#include <sys/mman.h>
+#include <sys/time.h>
+#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 */
+
+
+/**
+ * A random number used to "authenticate" the connection.
+ *
+ * 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;
/**
- * traverse the given directory recursively
+ * Struct to let command handlers execute a callback in afs context.
*
- * @param dirname the directory to traverse
- * @param f: the function to call for each entry.
+ * 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.
*
- * 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.
+ * 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.
*
- * \return On success, 1 is returned. Otherwise, this function returns a
- * negative value which indicates the kind of the error.
+ * 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.
+ *
+ * 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 *))
+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_handler Called for each shm area sent by the callback.
+ * \param private_result_data Passed verbatim to \a result_handler.
+ *
+ * This function creates a socket for communication with the afs process and a
+ * shared memory area (sma) to which the buffer pointed to by \a query is
+ * copied. It then notifies the afs process that the callback function \a f
+ * should be executed by sending the shared memory identifier (shmid) to the
+ * socket.
+
+ * If the callback produces a result, it sends any number of shared memory
+ * identifiers back via the socket. For each such identifier received, \a
+ * result_handler is called. The contents of the sma identified by the received
+ * shmid are passed to that function as an osl object. The private_result_data
+ * pointer is passed as the second argument to \a result_handler.
+ *
+ * \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,
+ callback_result_handler *result_handler,
+ void *private_result_data)
{
- 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)
+ struct callback_query *cq;
+ int num_results = 0, 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;
- ret = -E_OPENDIR;
- dir = opendir(".");
- if (!dir)
+ fd = ret;
+ ret = send_bin_buffer(fd, buf, sizeof(buf));
+ if (ret < 0)
goto out;
- /* scan cwd recursively */
- while ((entry = readdir(dir))) {
- mode_t m;
- char *tmp;
+ for (;;) {
+ ret = recv_bin_buffer(fd, buf, sizeof(int));
+ 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) {
+ struct callback_result *cr = result_shm;
+ struct osl_object result;
+ num_results++;
+ result.size = cr->result_size;
+ result.data = result_shm + sizeof(*cr);
+ if (result.size) {
+ assert(result_handler);
+ ret = result_handler(&result, private_result_data);
+ if (shm_detach(result_shm) < 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");
+ if (ret < 0)
+ break;
+ }
+out:
+ if (shm_destroy(query_shmid) < 0)
+ PARA_ERROR_LOG("%s\n", "shm destroy error");
+ if (fd >= 0)
+ close(fd);
+ if (ret >= 0)
+ ret = num_results;
+// PARA_DEBUG_LOG("callback_ret: %d\n", ret);
+ return ret;
+}
- if (!strcmp(entry->d_name, "."))
- continue;
- if (!strcmp(entry->d_name, ".."))
- continue;
- ret = -E_LSTAT;
- if (lstat(entry->d_name, &s) == -1)
+/**
+ * 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_handler See \ref send_callback_request.
+ * \param private_result_data See \ref send_callback_request.
+ *
+ * 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,
+ callback_result_handler *result_handler,
+ void *private_result_data)
+{
+ 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_handler,
+ private_result_data);
+ 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_handler See \ref send_callback_request.
+ * \param private_result_data See \ref send_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, callback_result_handler *result_handler,
+ void *private_result_data)
+{
+ return send_option_arg_callback_request(NULL, argc, argv, f, result_handler,
+ private_result_data);
+}
+
+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;
- m = s.st_mode;
- if (!S_ISREG(m) && !S_ISDIR(m)) /* skip links, sockets, ... */
+ 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_handler See \ref send_callback_request.
+ * \param private_result_data See \ref send_callback_request.
+ *
+ * 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 afs process via the callback method. See \ref
+ * send_callback_request for details.
+ *
+ * \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, callback_result_handler *result_handler,
+ void *private_result_data)
+{
+ 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_handler, private_result_data);
+ 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().
+ */
+static 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 void com_select_callback(int fd, const struct osl_object *query)
+{
+ struct para_buffer pb = {
+ .max_size = SHMMAX,
+ .private_data = &fd,
+ .max_size_handler = pass_buffer_as_shm
+ };
+ char *arg = query->data;
+ int num_admissible, ret, ret2;
+
+ ret = clear_score_table();
+ if (ret < 0) {
+ ret2 = para_printf(&pb, "%s\n", para_strerror(-ret));
+ goto out;
+ }
+ if (current_play_mode == PLAY_MODE_MOOD)
+ close_current_mood();
+ else
+ playlist_close();
+ ret = activate_mood_or_playlist(arg, &num_admissible);
+ if (ret < 0) {
+ ret2 = para_printf(&pb, "%s\nswitching back to %s\n",
+ para_strerror(-ret), current_mop?
+ current_mop : "dummy");
+ ret = activate_mood_or_playlist(current_mop, &num_admissible);
+ if (ret < 0) {
+ if (ret2 >= 0)
+ ret2 = para_printf(&pb, "failed, switching to dummy\n");
+ activate_mood_or_playlist(NULL, &num_admissible);
+ }
+ } else
+ ret2 = para_printf(&pb, "activated %s (%d admissible files)\n", current_mop?
+ current_mop : "dummy mood", num_admissible);
+out:
+ if (ret2 >= 0 && pb.offset)
+ pass_buffer_as_shm(pb.buf, pb.offset, &fd);
+ free(pb.buf);
+}
+
+/**
+ * Result handler for sending data to the para_client process.
+ *
+ * \param result The data to be sent.
+ * \param fd_ptr Pointer to the file descriptor.
+ *
+ * \return The return value of the underlying call to send_bin_buffer().
+ *
+ * \sa \ref callback_result_handler.
+ */
+int send_result(struct osl_object *result, void *fd_ptr)
+{
+ int fd = *(int *)fd_ptr;
+ if (!result->size)
+ return 1;
+ return send_bin_buffer(fd, result->data, result->size);
+}
+
+int com_select(int fd, int argc, char * const * const argv)
+{
+ struct osl_object query;
+
+ if (argc != 2)
+ return -E_AFS_SYNTAX;
+ query.data = argv[1];
+ query.size = strlen(argv[1]) + 1;
+ return send_callback_request(com_select_callback, &query,
+ &send_result, &fd);
+}
+
+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 (S_ISREG(m)) { /* regular file */
- if (guess_audio_format(entry->d_name) < 0)
+ 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 signal_pre_select(struct sched *s, struct task *t)
+{
+ struct signal_task *st = container_of(t, struct signal_task, task);
+ 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 = container_of(t, struct signal_task, task);
+ if (getppid() == 1) {
+ PARA_EMERG_LOG("para_server died\n");
+ goto shutdown;
+ }
+ if (!FD_ISSET(st->fd, &s->rfds))
+ return;
+ st->signum = para_next_signal();
+ if (st->signum == SIGHUP) {
+ close_afs_tables();
+ t->error = open_afs_tables();
+ if (t->error < 0)
+ return;
+ init_admissible_files(current_mop);
+ return;
+ }
+ PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
+shutdown:
+ sched_shutdown();
+ t->error = -E_AFS_SIGNAL;
+}
+
+static void register_signal_task(void)
+{
+ struct signal_task *st = &signal_task_struct;
+
+ if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
+ PARA_EMERG_LOG("failed to ignore SIGPIPE\n");
+ exit(EXIT_FAILURE);
+ }
+ if (signal(SIGUSR1, SIG_IGN) == SIG_ERR) {
+ PARA_EMERG_LOG("failed to ignore SIGUSR1\n");
+ exit(EXIT_FAILURE);
+ }
+ 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(SIGHUP);
+
+ st->task.pre_select = signal_pre_select;
+ st->task.post_select = signal_post_select;
+ 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 = container_of(t, struct command_task, task);
+ 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);
+}
+
+/**
+ * Send data as shared memory to a file descriptor.
+ *
+ * \param buf The buffer holding the data to be sent.
+ * \param size The size of \a buf.
+ * \param fd_ptr A pointer to the file descriptor.
+ *
+ * This function is used as the \a max_size handler in a \ref para_buffer
+ * structure. If used this way, it is called by \ref para_printf() whenever
+ * the buffer passed to para_printf() is about to exceed its maximal size.
+ *
+ * This function creates a shared memory area large enough to hold
+ * the content given by \a buf and \a size and sends the identifier
+ * of this area to the file descriptor given by \a fd_ptr.
+ *
+ * \return Zero if \a buf is \p NULL or \a size is zero. Negative on errors,
+ * and positive on success.
+ */
+int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr)
+{
+ int ret, shmid, fd = *(int *)fd_ptr;
+ void *shm;
+ struct callback_result *cr;
+
+ if (!buf || !size)
+ return 0;
+ ret = shm_new(size + sizeof(struct callback_result));
+ if (ret < 0)
+ return ret;
+ shmid = ret;
+ ret = shm_attach(shmid, ATTACH_RW, &shm);
+ if (ret < 0)
+ goto err;
+ cr = shm;
+ cr->result_size = size;
+ memcpy(shm + sizeof(*cr), buf, size);
+ ret = shm_detach(shm);
+ if (ret < 0)
+ goto err;
+ ret = send_bin_buffer(fd, (char *)&shmid, sizeof(int));
+ if (ret >= 0)
+ return ret;
+err:
+ if (shm_destroy(shmid) < 0)
+ PARA_ERROR_LOG("destroy result failed\n");
+ return ret;
+}
+
+/*
+ * 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;
+ struct callback_query *cq;
+ struct osl_object query;
+ int ret;
+
+ ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
+ if (ret < 0)
+ return ret;
+ cq = query_shm;
+ query.data = (char *)query_shm + sizeof(*cq);
+ query.size = cq->query_size;
+ cq->handler(fd, &query);
+ return 1;
+}
+
+static int execute_server_command(void)
+{
+ char buf[8];
+ int ret = recv_bin_buffer(server_socket, buf, sizeof(buf) - 1);
+
+ if (ret <= 0) {
+ if (!ret)
+ ret = -ERRNO_TO_PARA_ERROR(ECONNRESET);
+ goto err;
+ }
+ buf[ret] = '\0';
+ PARA_DEBUG_LOG("received: %s\n", buf);
+ ret = -E_BAD_CMD;
+ if (strcmp(buf, "new"))
+ goto err;
+ ret = open_next_audio_file();
+err:
+ return ret;
+}
+
+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)
+ goto err;
+ 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;
+ }
+ ret = call_callback(fd, query_shmid);
+ if (ret >= 0)
+ return;
+err:
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+}
+
+/** 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 = container_of(t, struct command_task, task);
+ struct sockaddr_un unix_addr;
+ struct afs_client *client, *tmp;
+ int fd, ret;
+
+ if (FD_ISSET(server_socket, &s->rfds)) {
+ ret = execute_server_command();
+ if (ret < 0) {
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ sched_shutdown();
+ return;
+ }
+ }
+
+ /* 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;
- ret = f(dirname, entry->d_name);
- if (ret < 0)
- goto out;
- continue;
+ PARA_WARNING_LOG("connection timeout\n");
}
- /* directory */
- tmp = make_message("%s/%s", dirname, entry->d_name);
- ret = find_audio_files(tmp, f);
- free(tmp);
+ close(client->fd);
+ list_del(&client->node);
+ free(client);
+ }
+ /* Accept connections on the local socket. */
+ if (!FD_ISSET(ct->fd, &s->rfds))
+ return;
+ ret = para_accept(ct->fd, &unix_addr, sizeof(unix_addr));
+ if (ret < 0) {
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ return;
+ }
+ fd = ret;
+ ret = mark_fd_nonblocking(fd);
+ if (ret < 0) {
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ close(fd);
+ return;
+ }
+ client = para_malloc(sizeof(*client));
+ client->fd = fd;
+ client->connect_time = *now;
+ para_list_add(&client->node, &afs_client_list);
+}
+
+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;
+ sprintf(ct->task.status, "command task");
+ register_task(&ct->task);
+}
+
+/**
+ * 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;
+
+ register_signal_task();
+ 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)
+ goto out;
+ server_socket = socket_fd;
+ ret = mark_fd_nonblocking(server_socket);
+ if (ret < 0)
+ goto out_close;
+ PARA_INFO_LOG("server_socket: %d, afs_socket_cookie: %u\n",
+ server_socket, (unsigned) cookie);
+ init_admissible_files(conf.afs_initial_mode_arg);
+ register_command_task(cookie);
+ s.default_timeout.tv_sec = 0;
+ s.default_timeout.tv_usec = 999 * 1000;
+ ret = schedule(&s);
+out_close:
+ close_afs_tables();
+out:
+ if (ret < 0)
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
+}
+
+static void create_tables_callback(int fd, const struct osl_object *query)
+{
+ uint32_t table_mask = *(uint32_t *)query->data;
+ int i, ret;
+ char *buf;
+
+ close_afs_tables();
+ for (i = 0; i < NUM_AFS_TABLES; i++) {
+ struct afs_table *t = &afs_tables[i];
+
+ if (!(table_mask & (1 << i)))
+ continue;
+ if (!t->create)
+ continue;
+ ret = t->create(database_dir);
if (ret < 0)
goto out;
}
- ret = 1;
+ ret = open_afs_tables();
out:
- if (dir)
- closedir(dir);
- if (fchdir(cwd_fd) < 0)
- ret = -E_CHDIR;
- close(cwd_fd);
+ if (ret >= 0)
+ buf = make_message("successfully created afs table(s)\n");
+ else
+ buf = make_message("%s\n", para_strerror(-ret));
+ pass_buffer_as_shm(buf, strlen(buf), &fd);
+ free(buf);
+}
+
+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, NULL);
if (ret < 0)
- PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
+ return send_va_buffer(fd, "%s\n", para_strerror(-ret));
return ret;
}
+
+/**
+ * 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;
+
+ 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 (!strcmp(arg, "-p")) {
+ flags |= CHECK_PLAYLISTS;
+ continue;
+ }
+ if (!strcmp(arg, "-m")) {
+ flags |= CHECK_MOODS;
+ continue;
+ }
+ 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, send_result, &fd);
+ if (ret < 0)
+ return ret;
+ }
+ if (flags & CHECK_PLAYLISTS) {
+ ret = send_callback_request(playlist_check_callback, NULL, send_result, &fd);
+ if (ret < 0)
+ return ret;
+ }
+ if (flags & CHECK_MOODS) {
+ ret = send_callback_request(mood_check_callback, NULL, send_result, &fd);
+ 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;
+}
projects / paraslash.git / blobdiff