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Date:: Mon Jan 9 10:06:12 2023 UTC
Message:: drop notify_seek var; always notify on seeks First move towards a change in the behaviour of `monitor': advancement on tracks during the play are reported also every second, as the music is played, not only when there's an explicit seek.
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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 "config.h"
18 
19 #include <sys/socket.h>
20 #include <sys/stat.h>
21 #include <sys/wait.h>
22 
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <limits.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <stdint.h>
30 #include <string.h>
31 #include <syslog.h>
32 #include <unistd.h>
33 
34 #include "amused.h"
35 #include "control.h"
36 #include "log.h"
37 #include "playlist.h"
38 #include "xmalloc.h"
39 
40 char		*csock = NULL;
41 int		 debug;
42 int		 verbose;
43 struct imsgev	*iev_player;
44 
45 const char	*argv0;
46 pid_t		 player_pid;
47 struct event	 ev_sigint;
48 struct event	 ev_sigterm;
49 
50 enum amused_process {
51 	PROC_MAIN,
52 	PROC_PLAYER,
53 };
54 
55 static __dead void
56 main_shutdown(void)
57 {
58 	pid_t	pid;
59 	int	status;
60 
61 	/* close pipes. */
62 	msgbuf_clear(&iev_player->ibuf.w);
63 	close(iev_player->ibuf.fd);
64 	free(iev_player);
65 
66 	log_debug("waiting for children to terminate");
67 	do {
68 		pid = wait(&status);
69 		if (pid == -1) {
70 			if (errno != EINTR && errno != ECHILD)
71 				fatal("wait");
72 		} else if (WIFSIGNALED(status))
73 			log_warnx("player terminated; signal %d",
74 			    WTERMSIG(status));
75 	} while (pid != -1 || (pid == -1 && errno == EINTR));
76 
77 	log_info("terminating");
78 	exit(0);
79 }
80 
81 static void
82 main_sig_handler(int sig, short event, void *arg)
83 {
84 	/*
85 	 * Normal signal handler rules don't apply because libevent
86 	 * decouples for us.
87 	 */
88 
89 	switch (sig) {
90 	case SIGTERM:
91 	case SIGINT:
92 		main_shutdown();
93 		break;
94 	default:
95 		fatalx("unexpected signal %d", sig);
96 	}
97 }
98 
99 static void
100 main_dispatch_player(int sig, short event, void *d)
101 {
102 	char		*errstr;
103 	struct imsgev	*iev = d;
104 	struct imsgbuf	*ibuf = &iev->ibuf;
105 	struct imsg	 imsg;
106 	size_t		 datalen;
107 	ssize_t		 n;
108 	int		 shut = 0;
109 
110 	if (event & EV_READ) {
111 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
112 			fatal("imsg_read error");
113 		if (n == 0)	/* Connection closed */
114 			shut = 1;
115 	}
116 	if (event & EV_WRITE) {
117 		if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
118 			fatal("msgbuf_write");
119 		if (n == 0)	/* Connection closed */
120 			shut = 1;
121 	}
122 
123 	for (;;) {
124 		if ((n = imsg_get(ibuf, &imsg)) == -1)
125 			fatal("imsg_get");
126 		if (n == 0)	/* No more messages. */
127 			break;
128 
129 		datalen = IMSG_DATA_SIZE(imsg);
130 		switch (imsg.hdr.type) {
131 		case IMSG_POS:
132 			if (datalen != sizeof(current_position))
133 				fatalx("IMSG_POS: got wrong size (%zu vs %zu)",
134 				    datalen, sizeof(current_position));
135 			memcpy(&current_position, imsg.data,
136 			    sizeof(current_position));
137 			if (current_position < 0)
138 				current_position = -1;
139 			control_notify(IMSG_CTL_SEEK);
140 			break;
141 		case IMSG_LEN:
142 			if (datalen != sizeof(current_duration))
143 				fatalx("IMSG_LEN: got wrong size (%zu vs %zu)",
144 				    datalen, sizeof(current_duration));
145 			memcpy(&current_duration, imsg.data,
146 			    sizeof(current_duration));
147 			if (current_duration < 0)
148 				current_duration = -1;
149 			break;
150 		case IMSG_ERR:
151 			if (datalen == 0)
152 				errstr = "unknown error";
153 			else {
154 				errstr = imsg.data;
155 				errstr[datalen-1] = '\0';
156 			}
157 			log_warnx("%s; skipping %s", errstr, current_song);
158 			playlist_dropcurrent();
159 			main_playlist_advance();
160 			if (play_state == STATE_PLAYING)
161 				control_notify(IMSG_CTL_NEXT);
162 			else
163 				control_notify(IMSG_CTL_STOP);
164 			break;
165 		case IMSG_EOF:
166 			if (repeat_one && main_play_song(current_song))
167 				break;
168 			else if (repeat_one || consume)
169 				playlist_dropcurrent();
170 			main_playlist_advance();
171 			if (play_state == STATE_PLAYING)
172 				control_notify(IMSG_CTL_NEXT);
173 			else
174 				control_notify(IMSG_CTL_STOP);
175 			break;
176 		default:
177 			log_debug("%s: error handling imsg %d", __func__,
178 			    imsg.hdr.type);
179 			break;
180 		}
181 		imsg_free(&imsg);
182 	}
183 
184 	if (!shut)
185 		imsg_event_add(iev);
186 	else {
187 		/* This pipe is dead.  Remove its event handler. */
188 		event_del(&iev->ev);
189 		event_loopexit(NULL);
190 	}
191 }
192 
193 static pid_t
194 start_child(enum amused_process proc, int fd)
195 {
196 	const char	*argv[7];
197 	int		 argc = 0;
198 	pid_t		 pid;
199 
200 	if (fd == -1 && debug)
201 		goto exec;
202 
203 	switch (pid = fork()) {
204 	case -1:
205 		fatal("cannot fork");
206 	case 0:
207 		break;
208 	default:
209 		close(fd);
210 		return pid;
211 	}
212 
213 	if (fd != 3) {
214 		if (fd != -1 && dup2(fd, 3) == -1)
215 			fatal("cannot setup imsg fd");
216 	} else if (fcntl(F_SETFD, 0) == -1)
217 		fatal("cannot setup imsg fd");
218 
219 exec:
220 	argv[argc++] = argv0;
221 
222 	switch (proc) {
223 	case PROC_MAIN:
224 		argv[argc++] = "-s";
225 		argv[argc++] = csock;
226 		argv[argc++] = "-Tm";
227 		break;
228 	case PROC_PLAYER:
229 		argv[argc++] = "-Tp";
230 		break;
231 	}
232 
233 	if (debug)
234 		argv[argc++] = "-d";
235 	if (verbose)
236 		argv[argc++] = "-v";
237 	argv[argc++] = NULL;
238 
239 	/* obnoxious casts */
240 	execvp(argv0, (char *const *)argv);
241 	fatal("execvp %s", argv0);
242 }
243 
244 /* daemon main routine */
245 static __dead void
246 amused_main(void)
247 {
248 	int	 pipe_main2player[2];
249 	int	 control_fd;
250 
251 	log_init(debug, LOG_DAEMON);
252 	log_setverbose(verbose);
253 	log_procinit("main");
254 
255 	if (!debug)
256 		daemon(1, 0);
257 
258 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
259 	    PF_UNSPEC, pipe_main2player) == -1)
260 		fatal("socketpair");
261 
262 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
263 
264 	event_init();
265 
266 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
267 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
268 
269 	signal_add(&ev_sigint, NULL);
270 	signal_add(&ev_sigterm, NULL);
271 
272 	signal(SIGHUP, SIG_IGN);
273 	signal(SIGCHLD, SIG_IGN);
274 	signal(SIGPIPE, SIG_IGN);
275 
276 	iev_player = xmalloc(sizeof(*iev_player));
277 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
278 	iev_player->handler = main_dispatch_player;
279 	iev_player->events = EV_READ;
280 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
281 	    iev_player->handler, iev_player);
282 	event_add(&iev_player->ev, NULL);
283 
284 	if ((control_fd = control_init(csock)) == -1)
285 		fatal("control socket setup failed %s", csock);
286 	control_listen(control_fd);
287 
288 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
289 		fatal("pledge");
290 
291 	log_info("startup");
292 	event_dispatch();
293 	main_shutdown();
294 }
295 
296 int
297 main(int argc, char **argv)
298 {
299 	int ch, proc = -1;
300 
301 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
302 	log_setverbose(1);
303 
304 	argv0 = argv[0];
305 	if (argv0 == NULL)
306 		argv0 = "amused";
307 
308 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
309 		switch (ch) {
310 		case 'd':
311 			debug = 1;
312 			break;
313 		case 's':
314 			free(csock);
315 			csock = xstrdup(optarg);
316 			break;
317 		case 'T':
318 			switch (*optarg) {
319 			case 'm':
320 				proc = PROC_MAIN;
321 				break;
322 			case 'p':
323 				proc = PROC_PLAYER;
324 				break;
325 			default:
326 				usage();
327 			}
328 			break;
329 		case 'v':
330 			verbose++;
331 			break;
332 		default:
333 			usage();
334 		}
335 	}
336 	argv += optind;
337 	argc -= optind;
338 
339 	if (proc == PROC_MAIN)
340 		amused_main();
341 	if (proc == PROC_PLAYER)
342 		exit(player(debug, verbose));
343 
344 	if (csock == NULL)
345 		xasprintf(&csock, "/tmp/amused-%d", getuid());
346 
347 	if (argc > 0)
348 		debug = 0;
349 
350 	ctl(argc, argv);
351 }
352 
353 void
354 spawn_daemon(void)
355 {
356 	start_child(PROC_MAIN, -1);
357 }
358 
359 void
360 imsg_event_add(struct imsgev *iev)
361 {
362 	iev->events = EV_READ;
363 	if (iev->ibuf.w.queued)
364 		iev->events |= EV_WRITE;
365 
366 	event_del(&iev->ev);
367 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
368 	event_add(&iev->ev, NULL);
369 }
370 
371 int
372 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
373     pid_t pid, int fd, const void *data, uint16_t datalen)
374 {
375 	int ret;
376 
377 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
378 	    datalen)) != -1)
379 		imsg_event_add(iev);
380 
381 	return ret;
382 }
383 
384 int
385 main_send_player(uint16_t type, int fd, const void *data, size_t len)
386 {
387 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, len);
388 }
389 
390 int
391 main_play_song(const char *path)
392 {
393 	struct stat sb;
394 	int fd;
395 
396 	if ((fd = open(path, O_RDONLY)) == -1) {
397 		log_warn("open %s", path);
398 		return 0;
399 	}
400 
401 	if (fstat(fd, &sb) == -1) {
402 		log_warn("failed to stat %s", path);
403 		close(fd);
404 		return 0;
405 	}
406 
407 	if (!S_ISREG(sb.st_mode)) {
408 		log_info("skipping non-regular file: %s", path);
409 		close(fd);
410 		return 0;
411 	}
412 
413 	play_state = STATE_PLAYING;
414 	main_send_player(IMSG_PLAY, fd, NULL, 0);
415 	return 1;
416 }
417 
418 void
419 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
420 {
421 	size_t datalen;
422 	char arg[PATH_MAX];
423 	const char *song;
424 
425 	datalen = IMSG_DATA_SIZE(*imsg);
426 	if (datalen != sizeof(arg)) {
427 		main_senderr(iev, "wrong size");
428 		return;
429 	}
430 
431 	memcpy(arg, imsg->data, sizeof(arg));
432 	if (arg[sizeof(arg)-1] != '\0') {
433 		main_senderr(iev, "data corrupted");
434 		return;
435 	}
436 
437 	song = playlist_jump(arg);
438 	if (song == NULL) {
439 		main_senderr(iev, "not found");
440 		return;
441 	}
442 
443 	control_notify(IMSG_CTL_JUMP);
444 
445 	main_send_player(IMSG_STOP, -1, NULL, 0);
446 	if (!main_play_song(song)) {
447 		main_senderr(iev, "can't play");
448 		playlist_dropcurrent();
449 		main_playlist_advance();
450 		return;
451 	}
452 
453 	main_send_status(iev);
454 }
455 
456 void
457 main_playlist_resume(void)
458 {
459 	const char *song;
460 
461 	if ((song = current_song) == NULL)
462 		song = playlist_advance();
463 
464 	for (; song != NULL; song = playlist_advance()) {
465 		if (main_play_song(song))
466 			return;
467 
468 		playlist_dropcurrent();
469 	}
470 }
471 
472 void
473 main_playlist_advance(void)
474 {
475 	const char *song;
476 
477 	for (;;) {
478 		song = playlist_advance();
479 		if (song == NULL)
480 			return;
481 
482 		if (main_play_song(song))
483 			break;
484 
485 		playlist_dropcurrent();
486 	}
487 }
488 
489 void
490 main_playlist_previous(void)
491 {
492 	const char *song;
493 
494 	for (;;) {
495 		song = playlist_previous();
496 		if (song == NULL)
497 			return;
498 
499 		if (main_play_song(song))
500 			break;
501 
502 		playlist_dropcurrent();
503 	}
504 }
505 
506 void
507 main_senderr(struct imsgev *iev, const char *msg)
508 {
509 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
510 	    msg, strlen(msg)+1);
511 }
512 
513 void
514 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
515     struct imsg *imsg)
516 {
517 	size_t datalen;
518 	char path[PATH_MAX];
519 	const char *err = NULL;
520 
521 	datalen = IMSG_DATA_SIZE(*imsg);
522 	if (datalen != sizeof(path)) {
523 		err = "data size mismatch";
524 		goto err;
525 	}
526 
527 	memcpy(path, imsg->data, sizeof(path));
528 	if (path[datalen-1] != '\0') {
529 		err = "malformed data";
530 		goto err;
531 	}
532 
533 	if (tx)
534 		playlist_push(px, path);
535 	else
536 		playlist_enqueue(path);
537 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
538 	return;
539 err:
540 	main_senderr(iev, err);
541 }
542 
543 void
544 main_send_playlist(struct imsgev *iev)
545 {
546 	struct player_status s;
547 	size_t i;
548 
549 	for (i = 0; i < playlist.len; ++i) {
550 		memset(&s, 0, sizeof(s));
551 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
552 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
553 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
554 		    sizeof(s));
555 	}
556 
557 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
558 }
559 
560 void
561 main_send_status(struct imsgev *iev)
562 {
563 	struct player_status s;
564 
565 	memset(&s, 0, sizeof(s));
566 
567 	if (current_song != NULL)
568 		strlcpy(s.path, current_song, sizeof(s.path));
569 	s.status = play_state;
570 	s.position = current_position;
571 	s.duration = current_duration;
572 	s.mode.repeat_all = repeat_all;
573 	s.mode.repeat_one = repeat_one;
574 	s.mode.consume = consume;
575 
576 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
577 }
578 
579 void
580 main_seek(struct player_seek *s)
581 {
582 	switch (play_state) {
583 	case STATE_STOPPED:
584 		main_playlist_resume();
585 		break;
586 	case STATE_PLAYING:
587 		break;
588 	case STATE_PAUSED:
589 		play_state = STATE_PLAYING;
590 		break;
591 	}
592 
593 	main_send_player(IMSG_CTL_SEEK, -1, s, sizeof(*s));
594 }