X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=audiod_command.c;h=8a87d91e108f4470f127d35538bb16ef920f5c76;hb=f4c330d6693eb3da840d9f2f8210997095987956;hp=5bd511df7693a1c6713b2c95917791a1a72d2d39;hpb=ff3b3cccbb2d8900270fddadcdb3bbc2f1d85f98;p=paraslash.git

diff --git a/audiod_command.c b/audiod_command.c
index 5bd511df..8a87d91e 100644
--- a/audiod_command.c
+++ b/audiod_command.c
@@ -1,84 +1,232 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file audiod_command.c commands for para_audiod */
+/** \file audiod_command.c Commands for para_audiod. */
 
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <regex.h>
 #include <sys/types.h>
-#include <dirent.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <netdb.h>
+#include <lopsub.h>
 
 #include "para.h"
+#include "audiod_cmd.lsg.h"
 #include "audiod.cmdline.h"
 #include "list.h"
-#include "close_on_fork.h"
 #include "sched.h"
 #include "ggo.h"
+#include "buffer_tree.h"
 #include "filter.h"
-#include "grab_client.cmdline.h"
 #include "grab_client.h"
-
 #include "error.h"
 #include "audiod.h"
 #include "net.h"
 #include "daemon.h"
 #include "string.h"
+#include "write.h"
 #include "fd.h"
-#include "audiod_command_list.h"
+#include "version.h"
 
+extern struct sched sched;
 extern char *stat_item_values[NUM_STAT_ITEMS];
 
+/** The maximal number of simultaneous connections. */
+#define MAX_STAT_CLIENTS 50
 
-/** iterate over the array of all audiod commands */
-#define FOR_EACH_COMMAND(c) for (c = 0; audiod_cmds[c].name; c++)
+/** Pointer to a command handler function. */
+typedef int (*audiod_cmd_handler_t)(int, struct lls_parse_result *);
 
-static int client_write(int fd, const char *buf)
+/** The lopsub user_data pointer. Only the command handler at the moment. */
+struct audiod_command_info {
+	audiod_cmd_handler_t handler; /**< Implementation of the command. */
+};
+
+/** Define the user_data pointer as expected by lopsub. */
+#define EXPORT_AUDIOD_CMD_HANDLER(_cmd) \
+	/** Implementation of _cmd. */ \
+	const struct audiod_command_info lsg_audiod_cmd_com_ ## _cmd ## _user_data = { \
+		.handler = com_ ## _cmd \
+	};
+
+/** Flags used for the stat command of para_audiod. */
+enum stat_client_flags {
+	/** Enable parser-friendly output. */
+	SCF_PARSER_FRIENDLY = 1,
+};
+
+/**
+ * Describes a status client of para_audiod.
+ *
+ * There's one such structure per audiod client that sent the 'stat' command.
+ *
+ * A status client is identified by its file descriptor.  para_audiod
+ * keeps a list of connected status clients.
+ */
+struct stat_client {
+	/** The stat client's file descriptor. */
+	int fd;
+	/** Bitmask of those status items the client is interested in. */
+	uint64_t item_mask;
+	/** See \ref stat_client flags. */
+	unsigned flags;
+	/** Its entry in the list of stat clients. */
+	struct list_head node;
+};
+
+static INITIALIZED_LIST_HEAD(client_list);
+static int num_clients;
+
+/** The list of all status items used by para_{server,audiod,gui}. */
+const char *status_item_list[] = {STATUS_ITEM_ARRAY};
+
+static void dump_stat_client_list(void)
 {
-	size_t len = strlen(buf);
-	return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
+	struct stat_client *sc;
+
+	list_for_each_entry(sc, &client_list, node)
+		PARA_INFO_LOG("stat client on fd %d\n", sc->fd);
 }
+/**
+ * Add a status client to the list.
+ *
+ * \param fd The file descriptor of the client.
+ * \param mask Bitfield of status items for this client.
+ * \param parser_friendly Enable parser-friendly output mode.
+ *
+ * Only those status items having the bit set in \a mask will be
+ * sent to the client.
+ *
+ * \return Positive value on success, or -E_TOO_MANY_CLIENTS if
+ * the number of connected clients exceeds #MAX_STAT_CLIENTS.
+ */
+static int stat_client_add(int fd, uint64_t mask, int parser_friendly)
+{
+	struct stat_client *new_client;
+	int ret;
 
-__malloc static char *audiod_status_string(void)
+	if (num_clients >= MAX_STAT_CLIENTS) {
+		PARA_ERROR_LOG("maximal number of stat clients (%d) exceeded\n",
+			MAX_STAT_CLIENTS);
+		return -E_TOO_MANY_CLIENTS;
+	}
+	ret = dup(fd);
+	if (ret < 0)
+		return -ERRNO_TO_PARA_ERROR(errno);
+	new_client = para_calloc(sizeof(*new_client));
+	new_client->fd = ret;
+	PARA_INFO_LOG("adding client on fd %d\n", new_client->fd);
+	new_client->item_mask = mask;
+	if (parser_friendly)
+		new_client->flags = SCF_PARSER_FRIENDLY;
+	para_list_add(&new_client->node, &client_list);
+	dump_stat_client_list();
+	num_clients++;
+	return 1;
+}
+
+static void close_stat_client(struct stat_client *sc)
 {
-	const char *status = (audiod_status == AUDIOD_ON)?
-		"on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
-	return make_message("%s: %s\n", status_item_list[SI_AUDIOD_STATUS], status);
+	PARA_INFO_LOG("closing client fd %d\n", sc->fd);
+	close(sc->fd);
+	list_del(&sc->node);
+	free(sc);
+	num_clients--;
 }
 
-static int get_play_time_slot_num(void)
+/**
+ * Empty the status clients list.
+ *
+ * This iterates over the list of connected status clients, closes each client
+ * file descriptor and frees the resources.
+ */
+void close_stat_clients(void)
 {
-	int i, oldest = -1;
+	struct stat_client *sc, *tmp;
+
+	list_for_each_entry_safe(sc, tmp, &client_list, node)
+		close_stat_client(sc);
+	assert(num_clients == 0);
+}
 
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = &slot[i];
-		if (!s->wng)
+/**
+ * Write a message to all connected status clients.
+ *
+ * \param item_num The number of the status item of \a msg.
+ *
+ * On write errors, remove the status client from the client list and close its
+ * file descriptor.
+ */
+void stat_client_write_item(int item_num)
+{
+	struct stat_client *sc, *tmp;
+	struct para_buffer pb = {.flags = 0};
+	struct para_buffer pfpb = {.flags = PBF_SIZE_PREFIX};
+	const uint64_t one = 1;
+	char *msg = stat_item_values[item_num];
+	struct para_buffer *b;
+
+	list_for_each_entry_safe(sc, tmp, &client_list, node) {
+		int ret;
+
+		if (!((one << item_num) & sc->item_mask))
 			continue;
-		if (oldest >= 0 && tv_diff(&s->wstime, &slot[oldest].wstime,
-				NULL) > 0)
+		b = (sc->flags & SCF_PARSER_FRIENDLY)? &pfpb : &pb;
+		if (!b->buf)
+			WRITE_STATUS_ITEM(b, item_num, "%s\n", msg? msg : "");
+		ret = write(sc->fd, b->buf, b->offset);
+		if (ret == b->offset)
 			continue;
-		oldest = i;
+		/* write error or short write */
+		close_stat_client(sc);
+		dump_stat_client_list();
 	}
-	return oldest;
+	free(pb.buf);
+	free(pfpb.buf);
 }
 
-__malloc static char *decoder_flags(void)
+/**
+ * Check if string is a known status item.
+ *
+ * \param item Buffer containing the text to check.
+ *
+ * \return If \a item is a valid status item, the number of that status item is
+ * returned. Otherwise, this function returns \p -E_UNKNOWN_STAT_ITEM.
+ */
+static int stat_item_valid(const char *item)
 {
 	int i;
-	char flags[MAX_STREAM_SLOTS + 1];
-
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = &slot[i];
-		char flag = '0';
-		if (s->receiver_node)
-			flag += 1;
-		if (s->wng)
-			flag += 2;
-		flags[i] = flag;
+	if (!item || !*item) {
+		PARA_ERROR_LOG("%s\n", "no item");
+		return -E_UNKNOWN_STAT_ITEM;
 	}
-	flags[MAX_STREAM_SLOTS] = '\0';
-	return make_message("%s: %s\n", status_item_list[SI_DECODER_FLAGS],
-		flags);
+	FOR_EACH_STATUS_ITEM(i)
+		if (!strcmp(status_item_list[i], item))
+			return i;
+	PARA_ERROR_LOG("invalid stat item: %s\n", item);
+	return -E_UNKNOWN_STAT_ITEM;
+}
+
+static int client_write(int fd, const char *buf)
+{
+	size_t len;
+
+	if (!buf)
+		return 0;
+	len = strlen(buf);
+	return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
+}
+
+__malloc static char *audiod_status_string(void)
+{
+	const char *status = (audiod_status == AUDIOD_ON)?
+		"on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
+	return para_strdup(status);
 }
 
 static int dump_commands(int fd)
@@ -86,10 +234,11 @@ static int dump_commands(int fd)
 	char *buf = para_strdup(""), *tmp = NULL;
 	int i;
 	ssize_t ret;
+	const struct lls_command *cmd;
 
-	FOR_EACH_COMMAND(i) {
-		tmp = make_message("%s%s\t%s\n", buf, audiod_cmds[i].name,
-			audiod_cmds[i].description);
+	for (i = 1; (cmd = lls_cmd(i, audiod_cmd_suite)); i++) {
+		tmp = make_message("%s%s\t%s\n", buf, lls_command_name(cmd),
+			lls_purpose(cmd));
 		free(buf);
 		buf = tmp;
 	}
@@ -98,394 +247,293 @@ static int dump_commands(int fd)
 	return ret;
 }
 
-/*
- * command handlers don't close their fd on errors (ret < 0) so that
- * its caller can send an error message. Otherwise (ret >= 0) it's up
- * to each individual command to close the fd if necessary.
- */
-
-int com_help(int fd, int argc, char **argv)
+static int com_help(int fd, struct lls_parse_result *lpr)
 {
-	int i, ret;
-	char *buf;
-	const char *dflt = "No such command. Available commands:\n";
-
-	if (argc < 2) {
-		ret = dump_commands(fd);
-		goto out;
+	int ret;
+	char *buf, *errctx;
+	const struct lls_command *cmd;
+
+	ret = lls(lls_check_arg_count(lpr, 0, 1, &errctx));
+	if (ret < 0) {
+		if (errctx) {
+			buf = make_message("%s\n", errctx);
+			client_write(fd, buf);
+			free(buf);
+			free(errctx);
+		}
+		return ret;
 	}
-	FOR_EACH_COMMAND(i) {
-		if (strcmp(audiod_cmds[i].name, argv[1]))
-			continue;
-		buf = make_message(
-			"NAME\n\t%s -- %s\n"
-			"SYNOPSIS\n\tpara_audioc %s\n"
-			"DESCRIPTION\n%s\n",
-			argv[1],
-			audiod_cmds[i].description,
-			audiod_cmds[i].usage,
-			audiod_cmds[i].help
-		);
-		ret = client_write(fd, buf);
+	if (lls_num_inputs(lpr) == 0)
+		return dump_commands(fd);
+	ret = lls(lls_lookup_subcmd(lls_input(0, lpr), audiod_cmd_suite,
+		&errctx));
+	if (ret < 0) {
+		buf = make_message("%s: %s\nAvailable commands:\n", errctx?
+			errctx : lls_input(0, lpr), para_strerror(-ret));
+		if (client_write(fd, buf) >= 0)
+			dump_commands(fd);
+		free(errctx);
 		free(buf);
 		goto out;
 	}
-	ret = client_write(fd, dflt);
-	if (ret > 0)
-		ret = dump_commands(fd);
+	cmd = lls_cmd(ret, audiod_cmd_suite);
+	buf = lls_long_help(cmd);
+	assert(buf);
+	ret = client_write(fd, buf);
+	free(buf);
 out:
-	if (ret >= 0)
-		close(fd);
-	return ret;
+	return ret < 0? ret : 0;
 }
+EXPORT_AUDIOD_CMD_HANDLER(help)
 
-int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_tasks(int fd, __a_unused struct lls_parse_result *lpr)
 {
-	char *tl = get_task_list();
-	int ret = 1;
-	if (tl)
-		ret = client_write(fd, tl);
-	free(tl);
-	if (ret > 0)
-		close(fd);
-	return ret;
-}
+	int ret;
+	char *tl = get_task_list(&sched);
 
-int com_kill(int fd, int argc, char **argv)
-{
-	int i, ret = 1;
-	if (argc < 2)
-		return -E_AUDIOD_SYNTAX;
-	for (i = 1; i < argc; i++) {
-		ret = kill_task(argv[i]);
-		if (ret < 0)
-			break;
-	}
-	if (ret > 0)
-		close(fd);
+	if (!tl) /* no tasks registered yet */
+		return 0;
+	ret = client_write(fd, tl);
+	free(tl);
 	return ret;
 }
+EXPORT_AUDIOD_CMD_HANDLER(tasks)
 
-int com_stat(int fd, int argc, char **argv)
+static int com_stat(int fd, struct lls_parse_result *lpr)
 {
-	int i, ret;
-	char *buf = NULL;
+	int i, ret, parser_friendly = 0;
 	uint64_t mask = 0;
 	const uint64_t one = 1;
+	struct para_buffer b = {.flags = 0};
+	const struct lls_opt_result *r;
+	unsigned num_inputs;
 
-	if (argc > 1) {
-		for (i = 1; i < argc; i++) {
-			ret = stat_item_valid(argv[i]);
-			if (ret < 0)
-				return ret;
-			mask |= (one << ret);
-		}
-	} else
-		mask--; /* set all bits */
-	PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
-	if (mask & (one << SI_PLAY_TIME)) {
-		int slot_num = get_play_time_slot_num();
-		char *ts = get_time_string(slot_num);
-		if (ts) {
-			PARA_ERROR_LOG("play time: %s\n", ts);
-			ret = client_write(fd, ts);
-			free(ts);
-			if (ret < 0)
-				goto out;
-		}
-	}
-	if (mask & (one << SI_AUDIOD_UPTIME)) {
-		char *tmp, *us = uptime_str();
-		tmp = make_message("%s: %s\n",
-			status_item_list[SI_AUDIOD_UPTIME], us);
-		free(us);
-		ret = client_write(fd, tmp);
-		free(tmp);
-		if (ret < 0)
-			goto out;
-	}
-	if (mask & (one << SI_AUDIOD_STATUS)) {
-		char *s = audiod_status_string();
-		ret = client_write(fd, s);
-		free(s);
-		if (ret < 0)
-			goto out;
+	ret = mark_fd_nonblocking(fd);
+	if (ret < 0)
+		return ret;
+	r = lls_opt_result(LSG_AUDIOD_CMD_STAT_OPT_PARSER_FRIENDLY, lpr);
+	if (lls_opt_given(r) > 0) {
+		parser_friendly = 1;
+		b.flags = PBF_SIZE_PREFIX;
 	}
-	if (mask & (one << SI_DECODER_FLAGS)) {
-		char *df = decoder_flags();
-		ret = client_write(fd, df);
-		free(df);
+	num_inputs = lls_num_inputs(lpr);
+	if (num_inputs == 0)
+		mask--; /* set all bits */
+	for (i = 0; i < num_inputs; i++) {
+		ret = stat_item_valid(lls_input(i, lpr));
 		if (ret < 0)
-			goto out;
+			return ret;
+		mask |= (one << ret);
 	}
+	PARA_INFO_LOG("mask: 0x%llx\n", (long long unsigned)mask);
 	FOR_EACH_STATUS_ITEM(i) {
-		char *tmp, *v;
+		char *item = stat_item_values[i];
 		if (!((one << i) & mask))
 			continue;
-		v = stat_item_values[i];
-		tmp = make_message("%s%s%s", buf? buf: "",
-			v? v : "", v? "\n" : "");
-		free(buf);
-		buf = tmp;
-	}
-	ret = client_write(fd, buf);
-out:
-	if (ret > 0)
-		ret = stat_client_add(fd, mask);
-	free(buf);
-	return ret;
-}
-
-static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
-{
-	int i;
-
-	FOR_EACH_SLOT(i) {
-		struct slot_info *s = &slot[i];
-		if (s->format < 0 || !s->fc)
-			continue;
-		if (slot_num >= 0 && slot_num != i)
-			continue;
-		if (format >= 0 && s->format != format)
-			continue;
-		if (num_filters(i) <= filternum)
-			continue;
-		/* success */
-		return  s->fc->filter_nodes + filternum;
+		WRITE_STATUS_ITEM(&b, i, "%s\n", item? item : "");
 	}
-	return NULL;
+	ret = client_write(fd, b.buf);
+	if (ret >= 0)
+		ret = stat_client_add(fd, mask, parser_friendly);
+	free(b.buf);
+	return ret < 0? ret : 0;
 }
+EXPORT_AUDIOD_CMD_HANDLER(stat)
 
-int com_grab(int fd, char *cmdline)
+static int com_grab(int fd, struct lls_parse_result *lpr)
 {
-	struct grab_client *gc;
-	struct filter_node *fn;
-	int i, err;
-	char *msg;
-
-	gc = grab_client_new(fd, cmdline, &err);
-	if (!gc)
-		goto err_out;
-	fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
-	if (fn)
-		activate_grab_client(gc, fn);
-	return 1;
-err_out:
-	if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
-		return err;
-	if (err == -E_GC_HELP_GIVEN) {
-		msg = make_message("%s\n\n", grab_client_args_info_usage);
-		for (i = 0; grab_client_args_info_help[i]; i++) {
-			char *tmp = make_message("%s%s\n", msg,
-				grab_client_args_info_help[i]);
-			free(msg);
-			msg = tmp;
-		}
-	} else
-		msg = make_message("%s %s\n",
-			GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
-			GRAB_CLIENT_CMDLINE_PARSER_VERSION);
-	err = client_write(fd, msg);
-	free(msg);
-	if (err < 0)
-		return err;
-	close(fd);
-	return 1;
+	int ret = grab_client_new(fd, lpr, &sched);
+	return ret < 0? ret : 0;
 }
+EXPORT_AUDIOD_CMD_HANDLER(grab)
 
-__noreturn int com_term(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_term(__a_unused int fd, __a_unused struct lls_parse_result *lpr)
 {
-	close(fd);
-	clean_exit(EXIT_SUCCESS, "terminating on user request");
+	return -E_AUDIOD_TERM;
 }
+EXPORT_AUDIOD_CMD_HANDLER(term)
 
-int com_on(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_on(__a_unused int fd, __a_unused struct lls_parse_result *lpr)
 {
 	audiod_status = AUDIOD_ON;
-	close(fd);
 	return 1;
 }
+EXPORT_AUDIOD_CMD_HANDLER(on)
 
-int com_off(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_off(__a_unused int fd, __a_unused struct lls_parse_result *lpr)
 {
 	audiod_status = AUDIOD_OFF;
-	close(fd);
 	return 1;
 }
+EXPORT_AUDIOD_CMD_HANDLER(off)
 
-int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
+static int com_sb(__a_unused int fd, __a_unused struct lls_parse_result *lpr)
 {
 	audiod_status = AUDIOD_STANDBY;
-	close(fd);
 	return 1;
 }
+EXPORT_AUDIOD_CMD_HANDLER(sb)
 
-int com_cycle(int fd, int argc, char **argv)
+static int com_cycle(__a_unused int fd, __a_unused struct lls_parse_result *lpr)
 {
 	switch (audiod_status) {
-		case  AUDIOD_ON:
-			return com_sb(fd, argc, argv);
-			break;
-		case  AUDIOD_OFF:
-			return com_on(fd, argc, argv);
-			break;
-		case  AUDIOD_STANDBY:
-			return com_off(fd, argc, argv);
-			break;
+		case  AUDIOD_ON: audiod_status = AUDIOD_STANDBY; break;
+		case  AUDIOD_OFF: audiod_status = AUDIOD_ON; break;
+		case  AUDIOD_STANDBY: audiod_status = AUDIOD_OFF; break;
 	}
-	close(fd);
 	return 1;
 }
+EXPORT_AUDIOD_CMD_HANDLER(cycle)
 
-static int check_perms(uid_t uid)
+static int com_version(int fd, struct lls_parse_result *lpr)
 {
-	int i;
-
-	if (!conf.user_allow_given)
-		return 1;
-	for (i = 0; i < conf.user_allow_given; i++)
-		if (uid == conf.user_allow_arg[i])
-			return 1;
-	return -E_UCRED_PERM;
+	int ret;
+	char *msg;
+	const struct lls_opt_result *r_v;
+
+	r_v = lls_opt_result(LSG_AUDIOD_CMD_VERSION_OPT_VERBOSE, lpr);
+	if (lls_opt_given(r_v))
+		msg = make_message("%s", version_text("audiod"));
+	else
+		msg = make_message("%s\n", version_single_line("audiod"));
+	ret = client_write(fd, msg);
+	free(msg);
+	return ret < 0? ret : 0;
 }
+EXPORT_AUDIOD_CMD_HANDLER(version)
 
 /**
- * handle arriving connections on the local socket
+ * Handle arriving connections on the local socket.
  *
- * \param accept_fd the fd to call accept() on
+ * \param accept_fd The fd to accept connections on.
+ * \param rfds If \a accept_fd is not set in \a rfds, do nothing.
  *
- * This is called whenever para_audiod's main task detects an incoming
- * connection by the readability of \a accept_fd. This function reads the
- * command sent by the peer, checks the connecting user's permissions by using
- * unix socket credentials (if supported by the OS) and calls the corresponding
- * command handler if permissions are OK.
+ * This is called in each iteration of the select loop. If there is an incoming
+ * connection on \a accept_fd, this function reads the command sent by the peer,
+ * checks the connecting user's permissions by using unix socket credentials
+ * (if supported by the OS) and calls the corresponding command handler if
+ * permissions are OK.
  *
- * \return positive on success, negative on errors
+ * \return Positive on success, negative on errors, zero if there was no
+ * connection to accept.
  *
  * \sa para_accept(), recv_cred_buffer()
  * */
-int handle_connect(int accept_fd)
+int handle_connect(int accept_fd, fd_set *rfds)
 {
-	int i, argc, ret, clifd = -1;
-	char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
+	int argc, ret, clifd;
+	char buf[MAXLINE], **argv = NULL;
 	struct sockaddr_un unix_addr;
 	uid_t uid;
-
-	ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
-	if (ret < 0)
-		goto out;
-	clifd = ret;
-	ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
+	const struct lls_command *cmd;
+	struct lls_parse_result *lpr;
+	char *errctx;
+	const struct audiod_command_info *aci;
+
+	ret = para_accept(accept_fd, rfds, &unix_addr, sizeof(struct sockaddr_un), &clifd);
+	if (ret <= 0)
+		return ret;
+	ret = recv_cred_buffer(clifd, buf, sizeof(buf) - 1);
 	if (ret < 0)
 		goto out;
 	uid = ret;
-	PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
-	ret = check_perms(uid);
+	PARA_INFO_LOG("connection from UID %d, buf: %s\n", ret, buf);
+	ret = -E_UCRED_PERM;
+	if (!uid_is_whitelisted(uid))
+		goto out;
+	ret = create_argv(buf, "\n", &argv);
+	if (ret <= 0)
+		goto out;
+	argc = ret;
+	ret = lls(lls_lookup_subcmd(argv[0], audiod_cmd_suite, &errctx));
 	if (ret < 0)
 		goto out;
-	cmd = para_strdup(buf);
-	p = strchr(cmd, '\n');
-	if (!p)
-		p = "";
-	else {
-		*p = '\0';
-		p++;
-	}
-	for (i = 0; audiod_cmds[i].name; i++) {
-		int j;
-		if (strcmp(audiod_cmds[i].name, cmd))
-			continue;
-		if (audiod_cmds[i].handler) {
-			argc = split_args(buf, &argv, "\n");
-			PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
-			ret = audiod_cmds[i].handler(clifd, argc, argv);
-			goto out;
-		}
-		for (j = 0; p[j]; j++)
-			if (p[j] == '\n')
-				p[j] = ' ';
-		PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
-		ret = audiod_cmds[i].line_handler(clifd, p);
+	cmd = lls_cmd(ret, audiod_cmd_suite);
+	ret = lls(lls_parse(argc, argv, cmd, &lpr, &errctx));
+	if (ret < 0)
 		goto out;
-	}
-	ret = -E_INVALID_AUDIOD_CMD;
+	aci = lls_user_data(cmd);
+	ret = aci->handler(clifd, lpr);
+	lls_free_parse_result(lpr, cmd);
 out:
-	free(cmd);
-	free(buf);
-	free(argv);
-	if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
-		char *tmp = make_message("%s\n", para_strerror(-ret));
+	free_argv(argv);
+	if (ret < 0 && ret != -E_CLIENT_WRITE) {
+		char *tmp;
+		if (errctx) {
+			tmp = make_message("%s\n", errctx);
+			free(errctx);
+			client_write(clifd, tmp);
+			free(tmp);
+		}
+		tmp = make_message("%s\n", para_strerror(-ret));
 		client_write(clifd, tmp);
 		free(tmp);
-		close(clifd);
 	}
+	close(clifd);
 	return ret;
 }
+
 /**
- * send the current audiod status to all connected stat clients
+ * Send the current audiod status to all connected stat clients.
+ *
+ * \param force Whether to write unchanged items.
  */
-void audiod_status_dump(void)
+void audiod_status_dump(bool force)
 {
-	int slot_num = get_play_time_slot_num();
-	char *old, *new, *tmp;
+	char *old, *new;
 
 	old = stat_item_values[SI_PLAY_TIME];
-	new = get_time_string(slot_num);
+	new = get_time_string();
 	if (new) {
-		if (!old || strcmp(old, new)) {
+		if (force || !old || strcmp(old, new)) {
 			free(old);
-			stat_client_write(new, SI_PLAY_TIME);
 			stat_item_values[SI_PLAY_TIME] = new;
+			stat_client_write_item(SI_PLAY_TIME);
 		} else
 			free(new);
 	}
 
-	new = uptime_str();
+	new = daemon_get_uptime_str(now);
 	old = stat_item_values[SI_AUDIOD_UPTIME];
-	if (!old || strcmp(old, new)) {
+	if (force || !old || strcmp(old, new)) {
 		free(old);
-		tmp = make_message("%s: %s\n",
-			status_item_list[SI_AUDIOD_UPTIME], new);
-		stat_client_write(tmp, SI_AUDIOD_UPTIME);
-		free(tmp);
 		stat_item_values[SI_AUDIOD_UPTIME] = new;
+		stat_client_write_item(SI_AUDIOD_UPTIME);
 	} else
 		free(new);
 
 	old = stat_item_values[SI_AUDIOD_STATUS];
 	new = audiod_status_string();
-	if (!old || strcmp(old, new)) {
+	if (force || !old || strcmp(old, new)) {
 		free(old);
-		stat_client_write(new, SI_AUDIOD_STATUS);
 		stat_item_values[SI_AUDIOD_STATUS] = new;
+		stat_client_write_item(SI_AUDIOD_STATUS);
 	} else
 		free(new);
 
 	old = stat_item_values[SI_DECODER_FLAGS];
-	new = decoder_flags();
-	if (!old || strcmp(old, new)) {
+	new = audiod_get_decoder_flags();
+	if (force || !old || strcmp(old, new)) {
 		free(old);
-		stat_client_write(new, SI_DECODER_FLAGS);
 		stat_item_values[SI_DECODER_FLAGS] = new;
+		stat_client_write_item(SI_DECODER_FLAGS);
 	} else
 		free(new);
 }
 
 /**
- * send empty status list
+ * Flush and send all status items.
  *
  * Send to  each connected client the full status item list
  * with empty values.
  */
-void dump_empty_status(void)
+void clear_and_dump_items(void)
 {
 	int i;
 
 	FOR_EACH_STATUS_ITEM(i) {
-		char *tmp = make_message("%s:\n", status_item_list[i]);
-		stat_client_write(tmp, i);
-		free(tmp);
 		free(stat_item_values[i]);
 		stat_item_values[i] = NULL;
+		stat_client_write_item(i);
 	}
 }