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Date:: Fri Jul 8 18:52:07 2022 UTC
Message:: keep track of current position and total duration
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/socket.h>
20 #include <sys/stat.h>
21 #include <sys/uio.h>
22 #include <sys/wait.h>
23 
24 #include <event.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28 #include <signal.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <string.h>
33 #include <syslog.h>
34 #include <unistd.h>
35 #include <imsg.h>
36 
37 #include "amused.h"
38 #include "control.h"
39 #include "log.h"
40 #include "playlist.h"
41 #include "xmalloc.h"
42 
43 char		*csock = NULL;
44 int		 debug;
45 int		 verbose;
46 struct imsgev	*iev_player;
47 
48 const char	*argv0;
49 pid_t		 player_pid;
50 struct event	 ev_sigint;
51 struct event	 ev_sigterm;
52 
53 enum amused_process {
54 	PROC_MAIN,
55 	PROC_PLAYER,
56 };
57 
58 __dead void
59 main_shutdown(void)
60 {
61 	pid_t	pid;
62 	int	status;
63 
64 	/* close pipes. */
65 	msgbuf_clear(&iev_player->ibuf.w);
66 	close(iev_player->ibuf.fd);
67 	free(iev_player);
68 
69 	log_debug("waiting for children to terminate");
70 	do {
71 		pid = wait(&status);
72 		if (pid == -1) {
73 			if (errno != EINTR && errno != ECHILD)
74 				fatal("wait");
75 		} else if (WIFSIGNALED(status))
76 			log_warnx("player terminated; signal %d",
77 			    WTERMSIG(status));
78 	} while (pid != -1 || (pid == -1 && errno == EINTR));
79 
80 	log_info("terminating");
81 	exit(0);
82 }
83 
84 static void
85 main_sig_handler(int sig, short event, void *arg)
86 {
87 	/*
88 	 * Normal signal handler rules don't apply because libevent
89 	 * decouples for us.
90 	 */
91 
92 	switch (sig) {
93 	case SIGTERM:
94 	case SIGINT:
95 		main_shutdown();
96 		break;
97 	default:
98 		fatalx("unexpected signal %d", sig);
99 	}
100 }
101 
102 static void
103 main_dispatch_player(int sig, short event, void *d)
104 {
105 	char		*errstr;
106 	struct imsgev	*iev = d;
107 	struct imsgbuf	*ibuf = &iev->ibuf;
108 	struct imsg	 imsg;
109 	size_t		 datalen;
110 	ssize_t		 n;
111 	int		 shut = 0;
112 
113 	if (event & EV_READ) {
114 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
115 			fatal("imsg_read error");
116 		if (n == 0)	/* Connection closed */
117 			shut = 1;
118 	}
119 	if (event & EV_WRITE) {
120 		if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
121 			fatal("msgbuf_write");
122 		if (n == 0)	/* Connection closed */
123 			shut = 1;
124 	}
125 
126 	for (;;) {
127 		if ((n = imsg_get(ibuf, &imsg)) == -1)
128 			fatal("imsg_get");
129 		if (n == 0)	/* No more messages. */
130 			break;
131 
132 		datalen = IMSG_DATA_SIZE(imsg);
133 		switch (imsg.hdr.type) {
134 		case IMSG_POS:
135 			if (datalen != sizeof(current_position))
136 				fatalx("IMSG_POS: got wrong size (%zu vs %zu)",
137 				    datalen, sizeof(current_position));
138 			memcpy(&current_position, imsg.data,
139 			    sizeof(current_position));
140 			if (current_position < 0)
141 				current_position = -1;
142 			break;
143 		case IMSG_LEN:
144 			if (datalen != sizeof(current_duration))
145 				fatalx("IMSG_LEN: got wrong size (%zu vs %zu)",
146 				    datalen, sizeof(current_duration));
147 			memcpy(&current_duration, imsg.data,
148 			    sizeof(current_duration));
149 			if (current_duration < 0)
150 				current_duration = -1;
151 			break;
152 		case IMSG_ERR:
153 			if (datalen == 0)
154 				errstr = "unknown error";
155 			else {
156 				errstr = imsg.data;
157 				errstr[datalen-1] = '\0';
158 			}
159 			log_warnx("%s; skipping %s", errstr, current_song);
160 			playlist_dropcurrent();
161 			/* fallthrough */
162 		case IMSG_EOF:
163 			if (repeat_one && current_song != NULL) {
164 				if (main_play_song(current_song))
165 					break;
166 				playlist_dropcurrent();
167 			}
168 			main_playlist_advance();
169 			if (play_state == STATE_PLAYING)
170 				control_notify(NULL, IMSG_CTL_NEXT);
171 			else
172 				control_notify(NULL, IMSG_CTL_STOP);
173 			break;
174 		default:
175 			log_debug("%s: error handling imsg %d", __func__,
176 			    imsg.hdr.type);
177 			break;
178 		}
179 		imsg_free(&imsg);
180 	}
181 
182 	if (!shut)
183 		imsg_event_add(iev);
184 	else {
185 		/* This pipe is dead.  Remove its event handler. */
186 		event_del(&iev->ev);
187 		event_loopexit(NULL);
188 	}
189 }
190 
191 static pid_t
192 start_child(enum amused_process proc, int fd)
193 {
194 	const char	*argv[7];
195 	int		 argc = 0;
196 	pid_t		 pid;
197 
198 	if (fd == -1 && debug)
199 		goto exec;
200 
201 	switch (pid = fork()) {
202 	case -1:
203 		fatal("cannot fork");
204 	case 0:
205 		break;
206 	default:
207 		close(fd);
208 		return pid;
209 	}
210 
211 	if (fd != 3) {
212 		if (fd != -1 && dup2(fd, 3) == -1)
213 			fatal("cannot setup imsg fd");
214 	} else if (fcntl(F_SETFD, 0) == -1)
215 		fatal("cannot setup imsg fd");
216 
217 exec:
218 	argv[argc++] = argv0;
219 
220 	switch (proc) {
221 	case PROC_MAIN:
222 		argv[argc++] = "-s";
223 		argv[argc++] = csock;
224 		argv[argc++] = "-Tm";
225 		break;
226 	case PROC_PLAYER:
227 		argv[argc++] = "-Tp";
228 		break;
229 	}
230 
231 	if (debug)
232 		argv[argc++] = "-d";
233 	if (verbose)
234 		argv[argc++] = "-v";
235 	argv[argc++] = NULL;
236 
237 	/* obnoxious casts */
238 	execvp(argv0, (char *const *)argv);
239 	fatal("execvp %s", argv0);
240 }
241 
242 /* daemon main routine */
243 static __dead void
244 amused_main(void)
245 {
246 	int	 pipe_main2player[2];
247 	int	 control_fd;
248 
249 	log_init(debug, LOG_DAEMON);
250 	log_setverbose(verbose);
251 	log_procinit("main");
252 
253 	if (!debug)
254 		daemon(1, 0);
255 
256 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
257 	    PF_UNSPEC, pipe_main2player) == -1)
258 		fatal("socketpair");
259 
260 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
261 
262 	event_init();
263 
264 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
265 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
266 
267 	signal_add(&ev_sigint, NULL);
268 	signal_add(&ev_sigterm, NULL);
269 
270 	signal(SIGHUP, SIG_IGN);
271 	signal(SIGCHLD, SIG_IGN);
272 	signal(SIGPIPE, SIG_IGN);
273 
274 	iev_player = xmalloc(sizeof(*iev_player));
275 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
276 	iev_player->handler = main_dispatch_player;
277 	iev_player->events = EV_READ;
278 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
279 	    iev_player->handler, iev_player);
280 	event_add(&iev_player->ev, NULL);
281 
282 	if ((control_fd = control_init(csock)) == -1)
283 		fatal("control socket setup failed %s", csock);
284 	control_listen(control_fd);
285 
286 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
287 		fatal("pledge");
288 
289 	log_info("startup");
290 	event_dispatch();
291 	main_shutdown();
292 }
293 
294 int
295 main(int argc, char **argv)
296 {
297 	int ch, proc = -1;
298 
299 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
300 	log_setverbose(1);
301 
302 	argv0 = argv[0];
303 	if (argv0 == NULL)
304 		argv0 = "amused";
305 
306 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
307 		switch (ch) {
308 		case 'd':
309 			debug = 1;
310 			break;
311 		case 's':
312 			free(csock);
313 			csock = xstrdup(optarg);
314 			break;
315 		case 'T':
316 			switch (*optarg) {
317 			case 'm':
318 				proc = PROC_MAIN;
319 				break;
320 			case 'p':
321 				proc = PROC_PLAYER;
322 				break;
323 			default:
324 				usage();
325 			}
326 			break;
327 		case 'v':
328 			verbose++;
329 			break;
330 		default:
331 			usage();
332 		}
333 	}
334 	argv += optind;
335 	argc -= optind;
336 
337 	if (proc == PROC_MAIN)
338 		amused_main();
339 	if (proc == PROC_PLAYER)
340 		exit(player(debug, verbose));
341 
342 	if (csock == NULL)
343 		xasprintf(&csock, "/tmp/amused-%d", getuid());
344 
345 	if (argc > 0)
346 		debug = 0;
347 
348 	ctl(argc, argv);
349 }
350 
351 void
352 spawn_daemon(void)
353 {
354 	start_child(PROC_MAIN, -1);
355 }
356 
357 void
358 imsg_event_add(struct imsgev *iev)
359 {
360 	iev->events = EV_READ;
361 	if (iev->ibuf.w.queued)
362 		iev->events |= EV_WRITE;
363 
364 	event_del(&iev->ev);
365 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
366 	event_add(&iev->ev, NULL);
367 }
368 
369 int
370 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
371     pid_t pid, int fd, const void *data, uint16_t datalen)
372 {
373 	int ret;
374 
375 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
376 	    datalen)) != -1)
377 		imsg_event_add(iev);
378 
379 	return ret;
380 }
381 
382 int
383 main_send_player(uint16_t type, int fd)
384 {
385 	return imsg_compose_event(iev_player, type, 0, 0, fd, NULL, 0);
386 }
387 
388 int
389 main_play_song(const char *path)
390 {
391 	struct stat sb;
392 	int fd;
393 
394 	if ((fd = open(path, O_RDONLY)) == -1) {
395 		log_warn("open %s", path);
396 		return 0;
397 	}
398 
399 	if (fstat(fd, &sb) == -1) {
400 		log_warn("failed to stat %s", path);
401 		close(fd);
402 		return 0;
403 	}
404 
405 	if (!S_ISREG(sb.st_mode)) {
406 		log_info("skipping non-regular file: %s", path);
407 		close(fd);
408 		return 0;
409 	}
410 
411 	play_state = STATE_PLAYING;
412 	main_send_player(IMSG_PLAY, fd);
413 	return 1;
414 }
415 
416 void
417 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
418 {
419 	size_t datalen;
420 	char arg[PATH_MAX];
421 	const char *song;
422 
423 	datalen = IMSG_DATA_SIZE(*imsg);
424 	if (datalen != sizeof(arg)) {
425 		main_senderr(iev, "wrong size");
426 		return;
427 	}
428 
429 	memcpy(arg, imsg->data, sizeof(arg));
430 	if (arg[sizeof(arg)-1] != '\0') {
431 		main_senderr(iev, "data corrupted");
432 		return;
433 	}
434 
435 	song = playlist_jump(arg);
436 	if (song == NULL) {
437 		main_senderr(iev, "not found");
438 		return;
439 	}
440 
441 	main_send_player(IMSG_STOP, -1);
442 	if (!main_play_song(song)) {
443 		main_senderr(iev, "can't play");
444 		playlist_dropcurrent();
445 		main_playlist_advance();
446 		return;
447 	}
448 
449 	main_send_status(iev);
450 }
451 
452 void
453 main_playlist_resume(void)
454 {
455 	const char *song;
456 
457 	if ((song = current_song) == NULL)
458 		song = playlist_advance();
459 
460 	for (; song != NULL; song = playlist_advance()) {
461 		if (main_play_song(song))
462 			return;
463 
464 		playlist_dropcurrent();
465 	}
466 }
467 
468 void
469 main_playlist_advance(void)
470 {
471 	const char *song;
472 
473 	for (;;) {
474 		song = playlist_advance();
475 		if (song == NULL)
476 			return;
477 
478 		if (main_play_song(song))
479 			break;
480 
481 		playlist_dropcurrent();
482 	}
483 }
484 
485 void
486 main_playlist_previous(void)
487 {
488 	const char *song;
489 
490 	for (;;) {
491 		song = playlist_previous();
492 		if (song == NULL)
493 			return;
494 
495 		if (main_play_song(song))
496 			break;
497 
498 		playlist_dropcurrent();
499 	}
500 }
501 
502 void
503 main_restart_track(void)
504 {
505 	if (current_song == NULL)
506 		return;
507 
508 	if (main_play_song(current_song))
509 		return;
510 
511 	playlist_dropcurrent();
512 	main_playlist_advance();
513 }
514 
515 void
516 main_senderr(struct imsgev *iev, const char *msg)
517 {
518 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
519 	    msg, strlen(msg)+1);
520 }
521 
522 void
523 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
524     struct imsg *imsg)
525 {
526 	size_t datalen;
527 	char path[PATH_MAX];
528 	const char *err = NULL;
529 
530 	datalen = IMSG_DATA_SIZE(*imsg);
531 	if (datalen != sizeof(path)) {
532 		err = "data size mismatch";
533 		goto err;
534 	}
535 
536 	memcpy(path, imsg->data, sizeof(path));
537 	if (path[datalen-1] != '\0') {
538 		err = "malformed data";
539 		goto err;
540 	}
541 
542 	if (tx)
543 		playlist_push(px, path);
544 	else
545 		playlist_enqueue(path);
546 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
547 	return;
548 err:
549 	main_senderr(iev, err);
550 }
551 
552 void
553 main_send_playlist(struct imsgev *iev)
554 {
555 	struct player_status s;
556 	size_t i;
557 
558 	for (i = 0; i < playlist.len; ++i) {
559 		memset(&s, 0, sizeof(s));
560 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
561 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
562 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
563 		    sizeof(s));
564 	}
565 
566 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
567 }
568 
569 void
570 main_send_status(struct imsgev *iev)
571 {
572 	struct player_status s;
573 
574 	memset(&s, 0, sizeof(s));
575 
576 	if (current_song != NULL)
577 		strlcpy(s.path, current_song, sizeof(s.path));
578 	s.status = play_state;
579 	s.position = current_position;
580 	s.duration = current_duration;
581 	s.rp.repeat_all = repeat_all;
582 	s.rp.repeat_one = repeat_one;
583 
584 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
585 }