ctl.c

/*
 * Copyright (c) 2022, 2023 Omar Polo <op@omarpolo.com>
 * Copyright (c) 2015 Theo de Raadt <deraadt@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/un.h>

#include <errno.h>
#include <fcntl.h>
#include <imsg.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>

#include "amused.h"
#include "log.h"
#include "playlist.h"
#include "xmalloc.h"

#ifndef nitems
#define nitems(x) (sizeof(x)/sizeof(x[0]))
#endif

static struct imsgbuf	*imsgbuf;
char			 cwd[PATH_MAX];

static int	ctl_noarg(struct parse_result *, int, char **);
static int	ctl_add(struct parse_result *, int, char **);
static int	ctl_show(struct parse_result *, int, char **);
static int	ctl_load(struct parse_result *, int, char **);
static int	ctl_jump(struct parse_result *, int, char **);
static int	ctl_repeat(struct parse_result *, int, char **);
static int	ctl_consume(struct parse_result *, int, char **);
static int	ctl_monitor(struct parse_result *, int, char **);
static int	ctl_seek(struct parse_result *, int, char **);
static int	ctl_shuffle(struct parse_result *, int, char **);
static int	ctl_status(struct parse_result *, int, char **);

struct ctl_command ctl_commands[] = {
	{ "add",	ADD,		ctl_add,	"file ..."},
	{ "consume",	MODE,		ctl_consume,	"[one|all]"},
	{ "flush",	FLUSH,		ctl_noarg,	""},
	{ "jump",	JUMP,		ctl_jump,	"pattern"},
	{ "load",	LOAD,		ctl_load,	"[file]"},
	{ "monitor",	MONITOR,	ctl_monitor,	"[events]"},
	{ "next",	NEXT,		ctl_noarg,	""},
	{ "pause",	PAUSE,		ctl_noarg,	""},
	{ "play",	PLAY,		ctl_noarg,	""},
	{ "previous",	PREV,		ctl_noarg,	""},
	{ "repeat",	MODE,		ctl_repeat,	"one|all [on|off]"},
	{ "restart",	RESTART,	ctl_noarg,	""},
	{ "seek",	SEEK,		ctl_seek,	"[+-]time[%]"},
	{ "show",	SHOW,		ctl_show,	"[-p]"},
	{ "shuffle",	SHUFFLE,	ctl_shuffle,	"[-a]" },
	{ "status",	STATUS,		ctl_status,	"[-f fmt]"},
	{ "stop",	STOP,		ctl_noarg,	""},
	{ "toggle",	TOGGLE,		ctl_noarg,	""},
};

__dead void
usage(void)
{
	fprintf(stderr, "usage: %s [-dv] [-s socket]\n", getprogname());
	exit(1);
}

static __dead void
ctl_usage(struct ctl_command *ctl)
{
	fprintf(stderr, "usage: %s [-v] [-s socket] %s %s\n", getprogname(),
	    ctl->name, ctl->usage);
	exit(1);
}

/* based on canonpath from kern_pledge.c */
static int
canonpath(const char *input, char *buf, size_t bufsize)
{
	const char *p;
	char *q, path[PATH_MAX];
	int r;

	if (input[0] != '/') {
		r = snprintf(path, sizeof(path), "%s/%s", cwd, input);
		if (r < 0 || (size_t)r >= sizeof(path)) {
			errno = ENAMETOOLONG;
			return -1;
		}
		input = path;
	}

	p = input;
	q = buf;
	while (*p && (q - buf < bufsize)) {
		if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) {
			p += 1;

		} else if (p[0] == '/' && p[1] == '.' &&
		    (p[2] == '/' || p[2] == '\0')) {
			p += 2;

		} else if (p[0] == '/' && p[1] == '.' && p[2] == '.' &&
		    (p[3] == '/' || p[3] == '\0')) {
			p += 3;
			if (q != buf)	/* "/../" at start of buf */
				while (*--q != '/')
					continue;

		} else {
			*q++ = *p++;
		}
	}
	if ((*p == '\0') && (q - buf < bufsize)) {
		*q = 0;
		return 0;
	} else {
		errno = ENAMETOOLONG;
		return -1;
	}
}

static int
parse(struct parse_result *res, int argc, char **argv)
{
	struct ctl_command	*ctl = NULL;
	const char		*argv0;
	int			 i, status;

	if ((argv0 = argv[0]) == NULL)
		argv0 = "status";

	for (i = 0; i < nitems(ctl_commands); ++i) {
		if (strncmp(ctl_commands[i].name, argv0, strlen(argv0))
		    == 0) {
			if (ctl != NULL) {
				fprintf(stderr,
				    "ambiguous argument: %s\n", argv0);
				usage();
			}
			ctl = &ctl_commands[i];
		}
	}

	if (ctl == NULL) {
		fprintf(stderr, "unknown argument: %s\n", argv[0]);
		usage();
	}

	res->action = ctl->action;
	res->ctl = ctl;

	status = ctl->main(res, argc, argv);
	close(imsgbuf->fd);
	free(imsgbuf);
	return status;
}

static int
load_files(struct parse_result *res, int *ret)
{
	const char	*file;
	char		*line = NULL;
	char		 path[PATH_MAX];
	size_t		 linesize = 0, i = 0;
	ssize_t		 linelen, curr = -1;

	while ((linelen = getline(&line, &linesize, res->fp)) != -1) {
		if (linelen == 0)
			continue;
		line[linelen-1] = '\0';
		file = line;
		if (!strncmp(file, "> ", 2)) {
			file += 2;
			curr = i;
		} else if (!strncmp(file, "  ", 2))
			file += 2;

		memset(path, 0, sizeof(path));
		if (canonpath(file, path, sizeof(path)) == -1) {
			log_warn("canonpath %s", file);
			continue;
		}

		i++;
		imsg_compose(imsgbuf, IMSG_CTL_ADD, 0, 0, -1,
		    path, sizeof(path));
	}

	free(line);
	if (ferror(res->fp))
		fatal("getline");
	fclose(res->fp);
	res->fp = NULL;

	imsg_compose(imsgbuf, IMSG_CTL_COMMIT, 0, 0, -1,
	    &curr, sizeof(curr));
	imsg_flush(imsgbuf);
	return 0;
}

static const char *
imsg_strerror(struct imsg *imsg)
{
	struct ibuf ibuf;
	size_t datalen;
	const char *msg;

	if (imsg_get_ibuf(imsg, &ibuf) == -1 ||
	    (datalen = ibuf_size(&ibuf)) == 0 ||
	    (msg = ibuf_data(&ibuf)) == NULL ||
	    msg[datalen - 1] != '\0')
		fatalx("malformed error message");

	return msg;
}

static const char *
event_name(int type)
{
	switch (type) {
	case IMSG_CTL_PLAY:
		return "play";
	case IMSG_CTL_PAUSE:
		return "pause";
	case IMSG_CTL_STOP:
		return "stop";
	case IMSG_CTL_NEXT:
		return "next";
	case IMSG_CTL_PREV:
		return "previous";
	case IMSG_CTL_JUMP:
		return "jump";
	case IMSG_CTL_ADD:
		return "add";
	case IMSG_CTL_COMMIT:
		return "load";
	case IMSG_CTL_MODE:
		return "mode";
	case IMSG_CTL_SEEK:
		return "seek";
	case IMSG_CTL_SHUFFLE:
		return "shuffle";
	default:
		return "unknown";
	}
}

static void
print_time(const char *label, int64_t seconds, const char *suffx)
{
	int hours, minutes;

	if (seconds < 0)
		seconds = 0;

	hours = seconds / 3600;
	seconds -= hours * 3600;

	minutes = seconds / 60;
	seconds -= minutes * 60;

	printf("%s", label);
	if (hours != 0)
		printf("%02d:", hours);
	printf("%02d:%02lld%s", minutes, (long long)seconds, suffx);
}

static void
print_status(struct player_status *ps, const char *spec)
{
	const char *status;
	double percent;
	char *dup, *tmp, *tok;

	if (ps->status == STATE_STOPPED)
		status = "stopped";
	else if (ps->status == STATE_PLAYING)
		status = "playing";
	else if (ps->status == STATE_PAUSED)
		status = "paused";
	else
		status = "unknown";

	percent = 100.0 * (double)ps->position / (double)ps->duration;

	tmp = dup = xstrdup(spec);
	while ((tok = strsep(&tmp, ",")) != NULL) {
		if (*tok == '\0')
			continue;

		if (!strcmp(tok, "path")) {
			puts(ps->path);
		} else if (!strcmp(tok, "mode:oneline")) {
			printf("repeat one:%s ",
			    ps->mode.repeat_one ? "on" : "off");
			printf("all:%s ", ps->mode.repeat_all ? "on" : "off");
			printf("consume:%s\n", ps->mode.consume ? "on" : "off");
		} else if (!strcmp(tok, "mode")) {
			printf("repeat all %s\n",
			    ps->mode.repeat_all ? "on" : "off");
			printf("repeat one %s\n",
			    ps->mode.repeat_one ? "on" : "off");
			printf("consume %s\n",
			    ps->mode.consume ? "on" : "off");
		} else if (!strcmp(tok, "status")) {
			printf("%s %s\n", status, ps->path);
		} else if (!strcmp(tok, "time:oneline")) {
			print_time("time ", ps->position, " / ");
			print_time("", ps->duration, "\n");
		} else if (!strcmp(tok, "time:percentage")) {
			printf("position %.2f%%\n", percent);
		} else if (!strcmp(tok, "time:raw")) {
			printf("position %lld\n", (long long)ps->position);
			printf("duration %lld\n", (long long)ps->duration);
		} else if (!strcmp(tok, "time")) {
			print_time("position ", ps->position, "\n");
			print_time("duration ", ps->duration, "\n");
		}
	}

	free(dup);
}

static void
print_monitor_event(struct player_event *ev)
{
	switch (ev->event) {
	case IMSG_CTL_MODE:
		printf("%s repeat one:%s all:%s consume:%s\n",
		    event_name(ev->event),
		    ev->mode.repeat_one ? "on" : "off",
		    ev->mode.repeat_all ? "on" : "off",
		    ev->mode.consume ? "on" : "off");
		break;
	case IMSG_CTL_SEEK:
		printf("%s %lld %lld\n", event_name(ev->event),
		    (long long)ev->position, (long long)ev->duration);
		break;
	default:
		puts(event_name(ev->event));
		break;
	}

	fflush(stdout);
}

static int
ctlaction(struct parse_result *res)
{
	char path[PATH_MAX];
	struct imsg imsg;
	struct player_status ps;
	struct player_event ev;
	ssize_t n;
	int i, type, ret = 0, done = 1;

	if (pledge("stdio", NULL) == -1)
		fatal("pledge");

	switch (res->action) {
	case PLAY:
		imsg_compose(imsgbuf, IMSG_CTL_PLAY, 0, 0, -1, NULL, 0);
		if (verbose) {
			imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1,
			    NULL, 0);
			done = 0;
		}
		break;
	case PAUSE:
		imsg_compose(imsgbuf, IMSG_CTL_PAUSE, 0, 0, -1, NULL, 0);
		break;
	case TOGGLE:
		imsg_compose(imsgbuf, IMSG_CTL_TOGGLE_PLAY, 0, 0, -1, NULL, 0);
		if (verbose) {
			imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1,
			    NULL, 0);
			done = 0;
		}
		break;
	case STOP:
		imsg_compose(imsgbuf, IMSG_CTL_STOP, 0, 0, -1, NULL, 0);
		break;
	case ADD:
		done = 0;
		for (i = 0; res->files[i] != NULL; ++i) {
			memset(path, 0, sizeof(path));
			if (canonpath(res->files[i], path, sizeof(path))
			    == -1) {
				log_warn("canonpath %s", res->files[i]);
				continue;
			}

			imsg_compose(imsgbuf, IMSG_CTL_ADD, 0, 0, -1,
			    path, sizeof(path));
		}
		ret = i == 0;
		break;
	case FLUSH:
		imsg_compose(imsgbuf, IMSG_CTL_FLUSH, 0, 0, -1, NULL, 0);
		break;
	case SHOW:
		done = 0;
		imsg_compose(imsgbuf, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
		break;
	case STATUS:
		done = 0;
		imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1, NULL, 0);
		break;
	case NEXT:
		imsg_compose(imsgbuf, IMSG_CTL_NEXT, 0, 0, -1, NULL, 0);
		if (verbose) {
			imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1,
			    NULL, 0);
			done = 0;
		}
		break;
	case PREV:
		imsg_compose(imsgbuf, IMSG_CTL_PREV, 0, 0, -1, NULL, 0);
		if (verbose) {
			imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1,
			    NULL, 0);
			done = 0;
		}
		break;
	case LOAD:
		done = 0;
		imsg_compose(imsgbuf, IMSG_CTL_BEGIN, 0, 0, -1, NULL, 0);
		break;
	case JUMP:
		done = 0;
		memset(path, 0, sizeof(path));
		strlcpy(path, res->files[0], sizeof(path));
		imsg_compose(imsgbuf, IMSG_CTL_JUMP, 0, 0, -1,
		    path, sizeof(path));
		break;
	case MODE:
		done = 0;
		imsg_compose(imsgbuf, IMSG_CTL_MODE, 0, 0, -1,
		    &res->mode, sizeof(res->mode));
		imsg_compose(imsgbuf, IMSG_CTL_STATUS, 0, 0, -1,
		    &res->mode, sizeof(res->mode));
		res->status_format = "mode:oneline";
		if (verbose)
			res->status_format = "mode";
		break;
	case MONITOR:
		done = 0;
		imsg_compose(imsgbuf, IMSG_CTL_MONITOR, 0, 0, -1,
		    NULL, 0);
		break;
	case RESTART:
		memset(&res->seek, 0, sizeof(res->seek));
		/* fallthrough */
	case SEEK:
		imsg_compose(imsgbuf, IMSG_CTL_SEEK, 0, 0, -1, &res->seek,
		    sizeof(res->seek));
		break;
	case SHUFFLE:
		imsg_compose(imsgbuf, IMSG_CTL_SHUFFLE, 0, 0, -1, &res->all,
		    sizeof(res->all));
		break;
	case NONE:
		/* action not expected */
		fatalx("invalid action %u", res->action);
		break;
	}

	if (ret != 0)
		goto end;

	imsg_flush(imsgbuf);

	i = 0;
	while (!done) {
		if ((n = imsg_read(imsgbuf)) == -1 && errno != EAGAIN)
			fatalx("imsg_read error");
		if (n == 0)
			fatalx("pipe closed");

		while (!done) {
			if ((n = imsg_get(imsgbuf, &imsg)) == -1)
				fatalx("imsg_get error");
			if (n == 0)
				break;

			type = imsg_get_type(&imsg);
			if (type == IMSG_CTL_ERR) {
				log_warnx("%s: %s", res->ctl->name,
				    imsg_strerror(&imsg));
				ret = 1;
				done = 1;
				break;
			}

			switch (res->action) {
			case ADD:
				if (res->files[i] == NULL)
					fatalx("received more replies than "
					    "files enqueued.");

				if (type == IMSG_CTL_ADD)
					log_debug("enqueued %s", res->files[i]);
				else
					fatalx("invalid message %d", type);
				i++;
				done = res->files[i] == NULL;
				break;
			case SHOW:
				if (imsg_get_len(&imsg) == 0) {
					done = 1;
					break;
				}
				if (imsg_get_data(&imsg, &ps, sizeof(ps))
				    == -1)
					fatalx("data size mismatch");
				if (ps.path[sizeof(ps.path) - 1] != '\0')
					fatalx("received corrupted data");
				if (res->pretty) {
					char c = ' ';
					if (ps.status == STATE_PLAYING)
						c = '>';
					printf("%c ", c);
				}
				puts(ps.path);
				break;
			case PLAY:
			case TOGGLE:
			case STATUS:
			case NEXT:
			case PREV:
			case JUMP:
			case MODE:
				if (type != IMSG_CTL_STATUS)
					fatalx("invalid message %d", type);

				if (imsg_get_data(&imsg, &ps, sizeof(ps))
				    == -1)
					fatalx("data size mismatch");
				if (ps.path[sizeof(ps.path) - 1] != '\0')
					fatalx("received corrupted data");

				print_status(&ps, res->status_format);
				done = 1;
				break;
			case LOAD:
				if (type == IMSG_CTL_ADD)
					break;
				if (type == IMSG_CTL_COMMIT) {
					done = 1;
					break;
				}

				if (type != IMSG_CTL_BEGIN)
					fatalx("invalid message %d", type);

				load_files(res, &ret);
				break;
			case MONITOR:
				if (type != IMSG_CTL_MONITOR)
					fatalx("invalid message %d", type);

				if (imsg_get_data(&imsg, &ev, sizeof(ev))
				    == -1)
					fatalx("data size mismatch");

				if (ev.event < 0 || ev.event > IMSG__LAST)
					fatalx("received corrupted data");

				if (!res->monitor[ev.event])
					break;

				print_monitor_event(&ev);
				break;
			default:
				done = 1;
				break;
			}

			imsg_free(&imsg);
		}
	}

end:
	return ret;
}

static int
ctl_noarg(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc > 0)
		ctl_usage(res->ctl);

	return ctlaction(res);
}

static int
ctl_add(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc == 0)
		ctl_usage(res->ctl);
	res->files = argv;

	return ctlaction(res);
}

static int
ctl_show(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "p")) != -1) {
		switch (ch) {
		case 'p':
			res->pretty = 1;
			break;
		default:
			ctl_usage(res->ctl);
		}
	}

	return ctlaction(res);
}

static int
ctl_load(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc > 1)
		ctl_usage(res->ctl);

	res->fp = stdin;
	if (argc == 1) {
		if ((res->fp = fopen(argv[0], "r")) == NULL)
			fatal("can't open %s", argv[0]);
	}

	return ctlaction(res);
}

static int
ctl_jump(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc != 1)
		ctl_usage(res->ctl);

	res->files = argv;
	return ctlaction(res);
}

static int
parse_mode(struct parse_result *res, const char *v)
{
	if (v == NULL)
		return MODE_TOGGLE;
	if (!strcmp(v, "on"))
		return MODE_ON;
	if (!strcmp(v, "off"))
		return MODE_OFF;
	ctl_usage(res->ctl);
}

static int
ctl_repeat(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc != 1 && argc != 2)
		ctl_usage(res->ctl);

	if (!strcmp(argv[0], "one"))
		res->mode.repeat_one = parse_mode(res, argv[1]);
	else if (!strcmp(argv[0], "all"))
		res->mode.repeat_all = parse_mode(res, argv[1]);
	else
		ctl_usage(res->ctl);

	return ctlaction(res);
}

static int
ctl_consume(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc > 1)
		ctl_usage(res->ctl);

	res->mode.consume = parse_mode(res, argv[0]);
	return ctlaction(res);
}

static int
ctl_monitor(struct parse_result *res, int argc, char **argv)
{
	int ch, n = 0;
	const char *events;
	char *dup, *tmp, *tok;

	while ((ch = getopt(argc, argv, "")) != -1)
		ctl_usage(res->ctl);
	argc -= optind;
	argv += optind;

	if (argc > 1)
		ctl_usage(res->ctl);

	events = "play,pause,stop,next,previous,jump,mode,add,load,seek";
	if (argc == 1)
		events = *argv;

	tmp = dup = xstrdup(events);
	while ((tok = strsep(&tmp, ",")) != NULL) {
		if (*tok == '\0')
			continue;

		n++;
		if (!strcmp(tok, "play"))
			res->monitor[IMSG_CTL_PLAY] = 1;
		else if (!strcmp(tok, "pause"))
			res->monitor[IMSG_CTL_PAUSE] = 1;
		else if (!strcmp(tok, "stop"))
			res->monitor[IMSG_CTL_STOP] = 1;
		else if (!strcmp(tok, "next"))
			res->monitor[IMSG_CTL_NEXT] = 1;
		else if (!strcmp(tok, "previous"))
			res->monitor[IMSG_CTL_PREV] = 1;
		else if (!strcmp(tok, "jump"))
			res->monitor[IMSG_CTL_JUMP] = 1;
		else if (!strcmp(tok, "mode"))
			res->monitor[IMSG_CTL_MODE] = 1;
		else if (!strcmp(tok, "add"))
			res->monitor[IMSG_CTL_ADD] = 1;
		else if (!strcmp(tok, "load"))
			res->monitor[IMSG_CTL_COMMIT] = 1;
		else if (!strcmp(tok, "seek"))
			res->monitor[IMSG_CTL_SEEK] = 1;
		else {
			log_warnx("unknown event \"%s\"", tok);
			n--;
		}
	}

	free(dup);
	if (n == 0)
		ctl_usage(res->ctl);
	return ctlaction(res);
}

static int
ctl_seek(struct parse_result *res, int argc, char **argv)
{
	const char *n;
	char *ep;
	int hours = 0, minutes = 0, seconds = 0;
	int sign = 1;

	if (argc > 0) {
		/* skip the command name */
		argc--;
		argv++;
	}

	if (argc > 0 && !strcmp(*argv, "--")) {
		argc--;
		argv++;
	}

	if (argc != 1)
		ctl_usage(res->ctl);

	n = *argv;
	if (*n == '-' || *n == '+')
		res->seek.relative = 1;
	if (*n == '-') {
		n++;
		sign = -1;
	}

	seconds = strtol(n, &ep, 10);
	if (n[0] == '\0' ||
	    (*ep != '\0' && *ep != ':' && *ep != '%') ||
	    (*ep == '%' && ep[1] != '\0'))
		fatalx("invalid offset: %s", argv[0]);
	if (*ep == '\0' || *ep == '%') {
		res->seek.percent = *ep == '%';
		goto done;
	}

	n = ++ep;
	minutes = seconds;
	seconds = strtol(n, &ep, 10);
	if (n[0] == '\0' || (*ep != '\0' && *ep != ':'))
		fatalx("invalid offset: %s", argv[0]);
	if (*ep == '\0')
		goto done;

	n = ++ep;
	hours = minutes;
	minutes = seconds;
	seconds = strtol(n, &ep, 10);
	if (n[0] == '\0' || *ep != '\0')
		fatalx("invalid offset: %s", argv[0]);

done:
	res->seek.offset = sign * (hours * 3600 + minutes * 60 + seconds);
	return ctlaction(res);
}

static int
ctl_shuffle(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "a")) != -1) {
		switch (ch) {
		case 'a':
			res->all = 1;
			break;
		default:
			ctl_usage(res->ctl);
		}
	}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		ctl_usage(res->ctl);

	return ctlaction(res);
}

static int
ctl_status(struct parse_result *res, int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, "f:")) != -1) {
		switch (ch) {
		case 'f':
			res->status_format = optarg;
			break;
		default:
			ctl_usage(res->ctl);
		}
	}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		ctl_usage(res->ctl);

	return ctlaction(res);
}

static int
ctl_get_lock(const char *lockfile)
{
	int lockfd;

	if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
		log_debug("open failed: %s", strerror(errno));
		return -1;
	}

	if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
		log_debug("flock failed: %s", strerror(errno));
		if (errno != EAGAIN)
			return -1;
		while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
			/* nop */;
		close(lockfd);
		return -2;
	}
	log_debug("flock succeeded");

	return lockfd;
}

static int
ctl_connect(void)
{
	struct timespec		 ts = { 0, 50000000 }; /* 0.05 seconds */
	struct sockaddr_un	 sa;
	size_t			 size;
	int			 fd, lockfd = -1, locked = 0, spawned = 0;
	int			 attempt = 0;
	char			*lockfile = NULL;

	memset(&sa, 0, sizeof(sa));
	sa.sun_family = AF_UNIX;
	size = strlcpy(sa.sun_path, csock, sizeof(sa.sun_path));
	if (size >= sizeof(sa.sun_path)) {
		errno = ENAMETOOLONG;
		return -1;
	}

retry:
	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
		return -1;

	if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
		log_debug("connection failed: %s", strerror(errno));
		if (errno != ECONNREFUSED && errno != ENOENT)
			goto failed;
		if (attempt++ == 100)
			goto failed;
		close(fd);

		if (!locked) {
			xasprintf(&lockfile, "%s.lock", csock);
			if ((lockfd = ctl_get_lock(lockfile)) < 0) {
				log_debug("didn't get the lock (%d)", lockfd);

				free(lockfile);
				lockfile = NULL;

				if (lockfd == -1)
					goto retry;
			}

			/*
			 * Always retry at least once, even if we got
			 * the lock, because another client could have
			 * taken the lock, started the server and released
			 * the lock between our connect() and flock()
			 */
			locked = 1;
			goto retry;
		}

		if (!spawned) {
			log_debug("spawning the daemon");
			spawn_daemon();
			spawned = 1;
		}

		nanosleep(&ts, NULL);
		goto retry;
	}

	if (locked && lockfd >= 0) {
		unlink(lockfile);
		free(lockfile);
		close(lockfd);
	}
	return fd;

failed:
	if (locked) {
		free(lockfile);
		close(lockfd);
	}
	close(fd);
	return -1;
}

__dead void
ctl(int argc, char **argv)
{
	struct parse_result res;
	const char *fmt;
	int ctl_sock;

	memset(&res, 0, sizeof(res));
	if ((fmt = getenv("AMUSED_STATUS_FORMAT")) == NULL)
		fmt = "status,time:oneline,mode:oneline";
	res.status_format = fmt;

	res.mode.consume = MODE_UNDEF;
	res.mode.repeat_all = MODE_UNDEF;
	res.mode.repeat_one = MODE_UNDEF;

	log_init(1, LOG_DAEMON);
	log_setverbose(verbose);

	if (getcwd(cwd, sizeof(cwd)) == NULL)
		fatal("getcwd");

	if ((ctl_sock = ctl_connect()) == -1)
		fatal("can't connect");

	imsgbuf = xmalloc(sizeof(*imsgbuf));
	imsg_init(imsgbuf, ctl_sock);

	optreset = 1;
	optind = 1;

	/* we'll drop rpath too later in ctlaction */
	if (pledge("stdio rpath", NULL) == -1)
		fatal("pledge");

	exit(parse(&res, argc, argv));
}