/*
- * Copyright (C) 2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2012 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file afs.c Paraslash's audio file selector. */
+#include <regex.h>
#include <signal.h>
#include <fnmatch.h>
+#include <osl.h>
+
#include "server.cmdline.h"
#include "para.h"
#include "error.h"
+#include "crypt.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"
+#include "mood.h"
+#include "sideband.h"
+#include "command.h"
/** The osl tables used by afs. \sa blob.c. */
enum afs_table_num {
};
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},
+ [TBLNUM_AUDIO_FILES] = {.init = aft_init, .name = "audio_files"},
+ [TBLNUM_ATTRIBUTES] = {.init = attribute_init, .name = "attributes"},
+ [TBLNUM_SCORES] = {.init = score_init, .name = "scores"},
+ [TBLNUM_MOODS] = {.init = moods_init, .name = "moods"},
+ [TBLNUM_LYRICS] = {.init = lyrics_init, .name = "lyrics"},
+ [TBLNUM_IMAGES] = {.init = images_init, .name = "images"},
+ [TBLNUM_PLAYLIST] = {.init = playlists_init, .name = "playlists"},
};
struct command_task {
struct task task;
};
+extern int mmd_mutex;
extern struct misc_meta_data *mmd;
static int server_socket;
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.
*
struct callback_result {
/** The number of bytes of the result. */
size_t result_size;
+ /** The band designator (loglevel for the result). */
+ uint8_t band;
};
+static int dispatch_result(int result_shmid, callback_result_handler *handler,
+ void *private_result_data)
+{
+ struct osl_object result;
+ void *result_shm;
+ /* must attach r/w as result.data might get encrypted in-place. */
+ int ret2, ret = shm_attach(result_shmid, ATTACH_RW, &result_shm);
+ struct callback_result *cr = result_shm;
+
+ if (ret < 0) {
+ PARA_ERROR_LOG("attach failed: %s\n", para_strerror(-ret));
+ return ret;
+ }
+ result.size = cr->result_size;
+ result.data = result_shm + sizeof(*cr);
+ if (result.size) {
+ assert(handler);
+ ret = handler(&result, cr->band, private_result_data);
+ if (ret < 0)
+ PARA_NOTICE_LOG("result handler error: %s\n",
+ para_strerror(-ret));
+ }
+ ret2 = shm_detach(result_shm);
+ if (ret2 < 0) {
+ PARA_ERROR_LOG("detach failed: %s\n", para_strerror(-ret2));
+ if (ret >= 0)
+ ret = ret2;
+ }
+ return ret;
+}
+
/**
* 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.
+ * \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 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.
+ * 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.
+ * \return Number of shared memory areas dispatched on success, negative on errors.
*
* \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)
+ callback_result_handler *result_handler,
+ void *private_result_data)
{
struct callback_query *cq;
- struct callback_result *cr;
int ret, fd = -1, query_shmid, result_shmid;
- void *query_shm, *result_shm;
+ void *query_shm;
char buf[sizeof(afs_socket_cookie) + sizeof(int)];
- struct sockaddr_un unix_addr;
size_t query_shm_size = sizeof(*cq);
+ int dispatch_error = 0, num_dispatched = 0;
if (query)
query_shm_size += query->size;
*(uint32_t *) buf = afs_socket_cookie;
*(int *) (buf + sizeof(afs_socket_cookie)) = query_shmid;
- ret = get_stream_socket(PF_UNIX);
+ ret = connect_local_socket(conf.afs_socket_arg);
if (ret < 0)
goto out;
fd = ret;
- ret = init_unix_addr(&unix_addr, conf.afs_socket_arg);
- if (ret < 0)
- goto out;
- ret = PARA_CONNECT(fd, &unix_addr);
- if (ret < 0)
- goto out;
- ret = send_bin_buffer(fd, buf, sizeof(buf));
+ ret = write_all(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);
+ /*
+ * Read all shmids from afs.
+ *
+ * Even if the dispatcher returns an error we _must_ continue to read
+ * shmids from fd so that we can destroy all shared memory areas that
+ * have been created for us by the afs process.
+ */
+ for (;;) {
+ ret = recv_bin_buffer(fd, buf, sizeof(int));
+ if (ret <= 0)
+ goto out;
+ assert(ret == sizeof(int));
+ ret = *(int *) buf;
+ assert(ret > 0);
+ result_shmid = ret;
+ if (!dispatch_error) {
+ ret = dispatch_result(result_shmid, result_handler,
+ private_result_data);
+ if (ret < 0)
+ dispatch_error = 1;
+ }
+ ret = shm_destroy(result_shmid);
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;
+ PARA_CRIT_LOG("destroy result failed: %s\n",
+ para_strerror(-ret));
+ num_dispatched++;
+ }
out:
if (shm_destroy(query_shmid) < 0)
- PARA_ERROR_LOG("%s\n", "shm destroy error");
+ PARA_CRIT_LOG("shm destroy error\n");
if (fd >= 0)
close(fd);
// PARA_DEBUG_LOG("callback_ret: %d\n", ret);
- return ret;
+ return ret < 0? ret : num_dispatched;
}
/**
* \param argc Argument count.
* \param argv Standard argument vector.
* \param f The callback function.
- * \param result The result of the query is stored here.
+ * \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.
*
+ * \return The return value of the underlying call to \ref
+ * send_callback_request().
+ *
* \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)
+ callback_result_handler *result_handler,
+ void *private_result_data)
{
char *p;
int i, ret;
strcpy(p, argv[i]); /* OK */
p += strlen(argv[i]) + 1;
}
- ret = send_callback_request(f, &query, result);
+ ret = send_callback_request(f, &query, result_handler,
+ private_result_data);
free(query.data);
return ret;
}
* \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().
+ * \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.
* send_option_arg_callback_request().
*/
int send_standard_callback_request(int argc, char * const * const argv,
- callback_function *f, struct osl_object *result)
+ callback_function *f, callback_result_handler *result_handler,
+ void *private_result_data)
{
- return send_option_arg_callback_request(NULL, argc, argv, f, result);
+ 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);
+ int ret = osl(osl_get_object(pmd->table, row, pmd->match_col_num, &name_obj));
const char *pattern_txt = (const char *)pmd->patterns.data;
if (ret < 0)
continue;
if (ret)
return -E_FNMATCH;
- return pmd->action(pmd->table, row, name, pmd->data);
+ ret = pmd->action(pmd->table, row, name, pmd->data);
+ if (ret >= 0)
+ pmd->num_matches++;
+ return ret;
}
return 1;
}
*
* \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().
+ * \return Standard.
*/
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);
+ return osl(osl_rbtree_loop_reverse(pmd->table, pmd->loop_col_num, pmd,
+ action_if_pattern_matches));
+ return osl(osl_rbtree_loop(pmd->table, pmd->loop_col_num, pmd,
+ action_if_pattern_matches));
}
/**
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};
*
* \sa open_and_update_audio_file().
*/
-int open_next_audio_file(void)
+static int open_next_audio_file(void)
{
struct osl_row *aft_row;
struct audio_file_data afd;
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));
+ 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));
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
goto no_admissible_files;
}
goto again;
no_admissible_files:
*(uint32_t *)buf = NO_ADMISSIBLE_FILES;
*(uint32_t *)(buf + 4) = (uint32_t)0;
- return send_bin_buffer(server_socket, buf, 8);
+ return write_all(server_socket, buf, 8);
}
/* Never fails if arg == NULL */
ret = change_current_mood(NULL); /* always successful */
mode = PLAY_MODE_MOOD;
} else {
- if (!strncmp(arg, "p:", 2)) {
+ if (!strncmp(arg, "p/", 2)) {
ret = playlist_open(arg + 2);
mode = PLAY_MODE_PLAYLIST;
- } else if (!strncmp(arg, "m:", 2)) {
+ } else if (!strncmp(arg, "m/", 2)) {
ret = change_current_mood(arg + 2);
mode = PLAY_MODE_MOOD;
} else
free(current_mop);
if (arg) {
current_mop = para_strdup(arg);
- mmd_lock();
+ mutex_lock(mmd_mutex);
strncpy(mmd->afs_mode_string, arg,
sizeof(mmd->afs_mode_string));
mmd->afs_mode_string[sizeof(mmd->afs_mode_string) - 1] = '\0';
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
} else {
- mmd_lock();
+ mutex_lock(mmd_mutex);
strcpy(mmd->afs_mode_string, "dummy");
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
current_mop = NULL;
}
}
return 1;
}
-static int com_select_callback(const struct osl_object *query,
- struct osl_object *result)
+static void com_select_callback(int fd, const struct osl_object *query)
{
- struct para_buffer pb = {.buf = NULL};
+ struct para_buffer pb = {
+ .max_size = shm_get_shmmax(),
+ .private_data = &(struct afs_max_size_handler_data) {
+ .fd = fd,
+ .band = SBD_OUTPUT
+ },
+ .max_size_handler = afs_max_size_handler,
+ };
char *arg = query->data;
- int num_admissible, ret;
+ int num_admissible, ret, ret2;
ret = clear_score_table();
- if (ret < 0)
- return ret;
+ 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) {
- para_printf(&pb, "%s\n", PARA_STRERROR(-ret));
- para_printf(&pb, "switching back to %s\n", current_mop?
+ 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) {
- para_printf(&pb, "failed, switching to dummy\n");
+ if (ret2 >= 0)
+ ret2 = 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;
+ } 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(fd, SBD_OUTPUT, pb.buf, pb.offset);
+ free(pb.buf);
}
-int com_select(int fd, int argc, char * const * const argv)
+/**
+ * Result handler for sending data to the para_client process.
+ *
+ * \param result The data to be sent.
+ * \param band The band designator.
+ * \param private Pointer to the command context.
+ *
+ * \return The return value of the underlying call to \ref command.c::send_sb.
+ *
+ * \sa \ref callback_result_handler, \ref command.c::send_sb.
+ */
+int afs_cb_result_handler(struct osl_object *result, uint8_t band,
+ void *private)
{
- int ret;
- struct osl_object query, result;
+ struct command_context *cc = private;
+
+ if (!result->size)
+ return 1;
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, result->data, result->size, band,
+ true);
+ return sc_send_bin_buffer(&cc->scc, result->data, result->size);
+}
+
+int com_select(struct command_context *cc)
+{
+ struct osl_object query;
- if (argc != 2)
+ if (cc->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;
+ query.data = cc->argv[1];
+ query.size = strlen(cc->argv[1]) + 1;
+ return send_callback_request(com_select_callback, &query,
+ &afs_cb_result_handler, cc);
}
static void init_admissible_files(char *arg)
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);
+ PARA_EMERG_LOG("%s: %s\n", para_strerror(-ret), socket_name);
exit(EXIT_FAILURE);
}
socket_fd = ret;
close(socket_fd);
return ret;
}
- PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name, ret);
+ PARA_INFO_LOG("listening on socket %s (fd %d)\n", socket_name,
+ socket_fd);
return socket_fd;
}
else {
char *home = para_homedir();
database_dir = make_message(
- "%s/.paraslash/afs_database", home);
+ "%s/.paraslash/afs_database-0.4", home);
free(home);
}
}
if (ret >= 0)
continue;
PARA_ERROR_LOG("%s init: %s\n", afs_tables[i].name,
- PARA_STRERROR(-ret));
+ para_strerror(-ret));
break;
}
if (ret >= 0)
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;
+ 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)
+static void afs_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))
+ int signum;
+
+ if (getppid() == 1) {
+ PARA_EMERG_LOG("para_server died\n");
+ goto shutdown;
+ }
+ signum = para_next_signal(&s->rfds);
+ if (signum == 0)
return;
- st->signum = para_next_signal();
- t->ret = 1;
- if (st->signum == SIGUSR1)
- return; /* ignore SIGUSR1 */
- if (st->signum == SIGHUP) {
+ if (signum == SIGHUP) {
close_afs_tables();
- t->ret = open_afs_tables();
- if (t->ret < 0)
- goto err;
+ parse_config_or_die(1);
+ t->error = open_afs_tables();
+ if (t->error < 0)
+ return;
init_admissible_files(current_mop);
return;
}
- t->ret = -E_AFS_SIGNAL;
-err:
- PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
- unregister_tasks();
+ PARA_EMERG_LOG("terminating on signal %d\n", signum);
+shutdown:
+ task_notify_all(s, E_AFS_SIGNAL);
+ t->error = -E_AFS_SIGNAL;
}
-static void register_signal_task(void)
+static void register_signal_task(struct sched *s)
{
struct signal_task *st = &signal_task_struct;
+
+ para_sigaction(SIGPIPE, SIG_IGN);
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;
+ st->task.post_select = afs_signal_post_select;
sprintf(st->task.status, "signal task");
- register_task(&st->task);
+ register_task(s, &st->task);
}
static struct list_head afs_client_list;
static void command_pre_select(struct sched *s, struct task *t)
{
- struct command_task *ct = t->private_data;
+ 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);
- t->ret = 1;
+}
+
+/**
+ * Send data as shared memory to a file descriptor.
+ *
+ * \param fd File descriptor to send the shmid to.
+ * \param band The band designator for this data.
+ * \param buf The buffer holding the data to be sent.
+ * \param size The size of \a buf.
+ *
+ * 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 \a fd.
+ *
+ * It is called by the AFS max_size handler as well as directly by the AFS
+ * command callbacks to send command output to the command handlers.
+ *
+ * \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(int fd, uint8_t band, char *buf, size_t size)
+{
+ int ret, shmid;
+ void *shm;
+ struct callback_result *cr;
+
+ if (!buf || !size)
+ return 0;
+ ret = shm_new(size + sizeof(*cr));
+ 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;
+ cr->band = band;
+ memcpy(shm + sizeof(*cr), buf, size);
+ ret = shm_detach(shm);
+ if (ret < 0)
+ goto err;
+ ret = write_all(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;
}
/*
*/
static int call_callback(int fd, int query_shmid)
{
- void *query_shm, *result_shm;
+ void *query_shm;
struct callback_query *cq;
- struct callback_result *cr;
- struct osl_object query, result = {.data = NULL};
- int result_shmid = -1, ret, ret2;
+ struct osl_object query;
+ int ret;
ret = shm_attach(query_shmid, ATTACH_RW, &query_shm);
if (ret < 0)
- goto out;
+ return ret;
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;
+ cq->handler(fd, &query);
+ return shm_detach(query_shm);
}
-static void execute_server_command(void)
+static int execute_server_command(fd_set *rfds)
{
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");
+ size_t n;
+ int ret = read_nonblock(server_socket, buf, sizeof(buf) - 1, rfds, &n);
+ if (ret < 0 || n == 0)
+ return ret;
+ buf[n] = '\0';
+ if (strcmp(buf, "new"))
+ return -E_BAD_CMD;
+ return open_next_audio_file();
}
-static void execute_afs_command(int fd, uint32_t expected_cookie)
+/* returns 0 if no data available, 1 else */
+static int execute_afs_command(int fd, fd_set *rfds, 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));
+ size_t n;
+ int ret = read_nonblock(fd, buf, sizeof(buf), rfds, &n);
- if (ret < 0) {
- PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
- return;
- }
- if (ret != sizeof(buf)) {
+ if (ret < 0)
+ goto err;
+ if (n == 0)
+ return 0;
+ if (n != sizeof(buf)) {
PARA_NOTICE_LOG("short read (%d bytes, expected %lu)\n",
ret, (long unsigned) sizeof(buf));
- return;
+ return 1;
}
cookie = *(uint32_t *)buf;
if (cookie != expected_cookie) {
- PARA_NOTICE_LOG("received invalid cookie(got %u, expected %u)\n",
+ PARA_NOTICE_LOG("received invalid cookie (got %u, expected %u)\n",
(unsigned)cookie, (unsigned)expected_cookie);
- return;
+ return 1;
}
query_shmid = *(int *)(buf + sizeof(cookie));
if (query_shmid < 0) {
PARA_WARNING_LOG("received invalid query shmid %d)\n",
query_shmid);
- return;
+ return 1;
}
- /* Ignore return value: Errors might be OK here. */
- call_callback(fd, query_shmid);
+ ret = call_callback(fd, query_shmid);
+ if (ret >= 0)
+ return 1;
+err:
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ return 1;
}
/** Shutdown connection if query has not arrived until this many seconds. */
static void command_post_select(struct sched *s, struct task *t)
{
- struct command_task *ct = t->private_data;
+ struct command_task *ct = container_of(t, struct command_task, task);
struct sockaddr_un unix_addr;
struct afs_client *client, *tmp;
- int fd;
- if (FD_ISSET(server_socket, &s->rfds))
- execute_server_command();
+ int fd, ret;
+ ret = task_get_notification(t);
+ if (ret < 0) {
+ t->error = ret;
+ return;
+ }
+ ret = execute_server_command(&s->rfds);
+ if (ret < 0) {
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ task_notify_all(s, -ret);
+ t->error = ret;
+ 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 */
+ ret = execute_afs_command(client->fd, &s->rfds, ct->cookie);
+ if (ret == 0) { /* prevent bogus connection flooding */
struct timeval diff;
tv_diff(now, &client->connect_time, &diff);
if (diff.tv_sec < AFS_CLIENT_TIMEOUT)
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));
+ ret = para_accept(ct->fd, &s->rfds, &unix_addr, sizeof(unix_addr), &fd);
+ if (ret < 0)
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ if (ret <= 0)
+ return;
+ ret = mark_fd_nonblocking(fd);
+ if (ret < 0) {
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
close(fd);
- goto out;
+ return;
}
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)
+static void register_command_task(uint32_t cookie, struct sched *s)
{
struct command_task *ct = &command_task_struct;
ct->fd = setup_command_socket_or_die();
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);
+ sprintf(ct->task.status, "afs command task");
+ register_task(s, &ct->task);
}
/**
*/
__noreturn void afs_init(uint32_t cookie, int socket_fd)
{
- struct sched s;
+ static struct sched s;
int i, ret;
+ register_signal_task(&s);
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);
- }
+ if (ret < 0)
+ goto out;
server_socket = socket_fd;
ret = mark_fd_nonblocking(server_socket);
if (ret < 0)
- exit(EXIT_FAILURE);
+ 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_tasks(cookie);
+ register_command_task(cookie, &s);
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));
+out_close:
close_afs_tables();
+out:
+ if (ret < 0)
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
exit(EXIT_FAILURE);
}
-static int create_tables_callback(const struct osl_object *query,
- __a_unused struct osl_object *result)
+static void create_tables_callback(int fd, const struct osl_object *query)
{
uint32_t table_mask = *(uint32_t *)query->data;
int i, ret;
+ struct para_buffer pb = {.buf = NULL};
close_afs_tables();
for (i = 0; i < NUM_AFS_TABLES; i++) {
continue;
ret = t->create(database_dir);
if (ret < 0)
- return ret;
+ goto out;
+ para_printf(&pb, "successfully created %s table\n", t->name);
}
ret = open_afs_tables();
- return ret < 0? ret: 0;
+out:
+ if (ret < 0)
+ para_printf(&pb, "%s\n", para_strerror(-ret));
+ if (pb.buf)
+ pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
+ free(pb.buf);
}
-int com_init(int fd, int argc, char * const * const argv)
+int com_init(struct command_context *cc)
{
int i, j, ret;
uint32_t table_mask = (1 << (NUM_AFS_TABLES + 1)) - 1;
ret = make_database_dir();
if (ret < 0)
return ret;
- if (argc != 1) {
+ if (cc->argc != 1) {
table_mask = 0;
- for (i = 1; i < argc; i++) {
+ for (i = 1; i < cc->argc; i++) {
for (j = 0; j < NUM_AFS_TABLES; j++) {
struct afs_table *t = &afs_tables[j];
- if (strcmp(argv[i], t->name))
+ if (strcmp(cc->argv[i], t->name))
continue;
table_mask |= (1 << j);
break;
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");
+ ret = send_callback_request(create_tables_callback, &query,
+ afs_cb_result_handler, cc);
+ if (ret < 0 && !cc->use_sideband)
+ /* ignore return value */
+ sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
+ return ret;
}
/**
CHECK_PLAYLISTS = 4
};
-int com_check(int fd, int argc, char * const * const argv)
+int com_check(struct command_context *cc)
{
unsigned flags = 0;
int i, ret;
- struct osl_object result;
- for (i = 1; i < argc; i++) {
- const char *arg = argv[i];
+ for (i = 1; i < cc->argc; i++) {
+ const char *arg = cc->argv[i];
if (arg[0] != '-')
break;
if (!strcmp(arg, "--")) {
}
return -E_AFS_SYNTAX;
}
- if (i < argc)
+ if (i < cc->argc)
return -E_AFS_SYNTAX;
if (!flags)
flags = ~0U;
if (flags & CHECK_AFT) {
- ret = send_callback_request(aft_check_callback, NULL, &result);
+ ret = send_callback_request(aft_check_callback, NULL,
+ afs_cb_result_handler, cc);
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_PLAYLISTS) {
- ret = send_callback_request(playlist_check_callback, NULL, &result);
+ ret = send_callback_request(playlist_check_callback,
+ NULL, afs_cb_result_handler, cc);
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);
+ ret = send_callback_request(mood_check_callback, NULL,
+ afs_cb_result_handler, cc);
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;
}
+/**
+ * The afs event dispatcher.
+ *
+ * \param event Type of the event.
+ * \param pb May be \p NULL.
+ * \param data Type depends on \a event.
+ *
+ * This function calls the table handlers of all tables and passes \a pb and \a
+ * data verbatim. It's up to the handlers to interpret the \a data pointer.
+ */
void afs_event(enum afs_events event, struct para_buffer *pb,
void *data)
{
continue;
ret = t->event_handler(event, pb, data);
if (ret < 0)
- PARA_CRIT_LOG("%s\n", PARA_STRERROR(-ret));
+ PARA_CRIT_LOG("table %s, event %d: %s\n", t->name,
+ event, para_strerror(-ret));
}
}
-int images_event_handler(__a_unused enum afs_events event,
+/**
+ * Dummy event handler for the images table.
+ *
+ * \param event Unused.
+ * \param pb Unused.
+ * \param data Unused.
+ *
+ * \return The images table does not honor events, so this handler always
+ * returns success.
+ */
+__a_const 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,
+/**
+ * Dummy event handler for the lyrics table.
+ *
+ * \param event Unused.
+ * \param pb Unused.
+ * \param data Unused.
+ *
+ * \return The lyrics table does not honor events, so this handler always
+ * returns success.
+ */
+__a_const int lyrics_event_handler(__a_unused enum afs_events event,
__a_unused struct para_buffer *pb, __a_unused void *data)
{
return 1;