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Date:: Tue Feb 22 12:19:30 2022 UTC
Message:: always call playlist_dropcurrent after main_play_song failures otherwise we keep garbage in the playing queue.
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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 <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/socket.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <event.h>
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <limits.h>
27 #include <sndio.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 struct sio_hdl	*hdl;
44 char		*csock = NULL;
45 int		 debug;
46 int		 verbose;
47 struct imsgev	*iev_player;
48 
49 const char	*argv0;
50 pid_t		 player_pid;
51 struct event	 ev_sigint;
52 struct event	 ev_sigterm;
53 
54 enum amused_process {
55 	PROC_MAIN,
56 	PROC_PLAYER,
57 };
58 
59 __dead void
60 main_shutdown(void)
61 {
62 	pid_t	pid;
63 	int	status;
64 
65 	/* close pipes. */
66 	msgbuf_clear(&iev_player->ibuf.w);
67 	close(iev_player->ibuf.fd);
68 	free(iev_player);
69 
70 	log_debug("waiting for children to terminate");
71 	do {
72 		pid = wait(&status);
73 		if (pid == -1) {
74 			if (errno != EINTR && errno != ECHILD)
75 				fatal("wait");
76 		} else if (WIFSIGNALED(status))
77 			log_warnx("player terminated; signal %d",
78 			    WTERMSIG(status));
79 	} while (pid != -1 || (pid == -1 && errno == EINTR));
80 
81 	log_info("terminating");
82 	exit(0);
83 }
84 
85 static void
86 main_sig_handler(int sig, short event, void *arg)
87 {
88 	/*
89 	 * Normal signal handler rules don't apply because libevent
90 	 * decouples for us.
91 	 */
92 
93 	switch (sig) {
94 	case SIGTERM:
95 	case SIGINT:
96 		main_shutdown();
97 		break;
98 	default:
99 		fatalx("unexpected signal %d", sig);
100 	}
101 }
102 
103 static void
104 main_dispatch_player(int sig, short event, void *d)
105 {
106 	struct imsgev	*iev = d;
107 	struct imsgbuf	*ibuf = &iev->ibuf;
108 	struct imsg	 imsg;
109 	ssize_t		 n;
110 	int		 shut = 0;
111 
112 	if (event & EV_READ) {
113 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
114 			fatal("imsg_read error");
115 		if (n == 0)	/* Connection closed */
116 			shut = 1;
117 	}
118 	if (event & EV_WRITE) {
119 		if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
120 			fatal("msgbuf_write");
121 		if (n == 0)	/* Connection closed */
122 			shut = 1;
123 	}
124 
125 	for (;;) {
126 		if ((n = imsg_get(ibuf, &imsg)) == -1)
127 			fatal("imsg_get");
128 		if (n == 0)	/* No more messages. */
129 			break;
130 
131 		switch (imsg.hdr.type) {
132 		case IMSG_ERR:
133 			playlist_dropcurrent();
134 			/* fallthrough */
135 		case IMSG_EOF:
136 			if (repeat_one && current_song != NULL) {
137 				if (main_play_song(current_song))
138 					break;
139 				playlist_dropcurrent();
140 			}
141 			main_playlist_advance();
142 			if (play_state == STATE_PLAYING)
143 				control_notify(NULL, IMSG_CTL_NEXT);
144 			else
145 				control_notify(NULL, IMSG_CTL_STOP);
146 			break;
147 
148 		default:
149 			log_debug("%s: error handling imsg %d", __func__,
150 			    imsg.hdr.type);
151 			break;
152 		}
153 		imsg_free(&imsg);
154 	}
155 
156 	if (!shut)
157 		imsg_event_add(iev);
158 	else {
159 		/* This pipe is dead.  Remove its event handler. */
160 		event_del(&iev->ev);
161 		event_loopexit(NULL);
162 	}
163 }
164 
165 static pid_t
166 start_child(enum amused_process proc, int fd)
167 {
168 	const char	*argv[6];
169 	int		 argc = 0;
170 	pid_t		 pid;
171 
172 	switch (pid = fork()) {
173 	case -1:
174 		fatal("cannot fork");
175 	case 0:
176 		break;
177 	default:
178 		close(fd);
179 		return pid;
180 	}
181 
182 	if (fd != 3) {
183 		if (fd != -1 && dup2(fd, 3) == -1)
184 			fatal("cannot setup imsg fd");
185 	} else if (fcntl(F_SETFD, 0) == -1)
186 		fatal("cannot setup imsg fd");
187 
188 	argv[argc++] = argv0;
189 
190 	switch (proc) {
191 	case PROC_MAIN:
192 		argv[argc++] = "-s";
193 		argv[argc++] = csock;
194 		break;
195 	case PROC_PLAYER:
196 		argv[argc++] = "-Tp";
197 		break;
198 	}
199 
200 	if (debug)
201 		argv[argc++] = "-d";
202 	if (verbose)
203 		argv[argc++] = "-v";
204 	argv[argc++] = NULL;
205 
206 	/* obnoxious casts */
207 	execvp(argv0, (char *const *)argv);
208 	fatal("execvp %s", argv0);
209 }
210 
211 /* daemon main routine */
212 static __dead int
213 amused_main(void)
214 {
215 	int	 pipe_main2player[2];
216 	int	 control_fd;
217 
218 	log_init(debug, LOG_DAEMON);
219 	log_setverbose(verbose);
220 	log_procinit("main");
221 
222 	if (!debug)
223 		daemon(1, 0);
224 
225 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
226 	    PF_UNSPEC, pipe_main2player) == -1)
227 		fatal("socketpair");
228 
229 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
230 
231 	event_init();
232 
233 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
234 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
235 
236 	signal_add(&ev_sigint, NULL);
237 	signal_add(&ev_sigterm, NULL);
238 
239 	signal(SIGHUP, SIG_IGN);
240 	signal(SIGCHLD, SIG_IGN);
241 	signal(SIGPIPE, SIG_IGN);
242 
243 	iev_player = xmalloc(sizeof(*iev_player));
244 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
245 	iev_player->handler = main_dispatch_player;
246 	iev_player->events = EV_READ;
247 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
248 	    iev_player->handler, iev_player);
249 	event_add(&iev_player->ev, NULL);
250 
251 	if ((control_fd = control_init(csock)) == -1)
252 		fatal("control socket setup failed %s", csock);
253 	control_listen(control_fd);
254 
255 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
256 		fatal("pledge");
257 
258 	log_info("startup");
259 	event_dispatch();
260 	main_shutdown();
261 }
262 
263 int
264 main(int argc, char **argv)
265 {
266 	int ch, proc = PROC_MAIN;
267 
268 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
269 	log_setverbose(1);
270 
271 	argv0 = argv[0];
272 	if (argv0 == NULL)
273 		argv0 = "amused";
274 
275 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
276 		switch (ch) {
277 		case 'd':
278 			debug = 1;
279 			break;
280 		case 's':
281 			free(csock);
282 			csock = xstrdup(optarg);
283 			break;
284 		case 'T':
285 			switch (*optarg) {
286 			case 'p':
287 				proc = PROC_PLAYER;
288 				break;
289 			default:
290 				usage();
291 			}
292 			break;
293 		case 'v':
294 			verbose++;
295 			break;
296 		default:
297 			usage();
298 		}
299 	}
300 	argv += optind;
301 	argc -= optind;
302 
303 	if (proc == PROC_PLAYER)
304 		exit(player(debug, verbose));
305 
306 	if (csock == NULL)
307 		xasprintf(&csock, "/tmp/amused-%d", getuid());
308 
309 	if (argc == 0)
310 		amused_main();
311 	else
312 		ctl(argc, argv);
313 	return 0;
314 }
315 
316 void
317 spawn_daemon(void)
318 {
319 	debug = 0;
320 	start_child(PROC_MAIN, -1);
321 }
322 
323 void
324 imsg_event_add(struct imsgev *iev)
325 {
326 	iev->events = EV_READ;
327 	if (iev->ibuf.w.queued)
328 		iev->events |= EV_WRITE;
329 
330 	event_del(&iev->ev);
331 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
332 	event_add(&iev->ev, NULL);
333 }
334 
335 int
336 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
337     pid_t pid, int fd, const void *data, uint16_t datalen)
338 {
339 	int ret;
340 
341 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
342 	    datalen)) != -1)
343 		imsg_event_add(iev);
344 
345 	return ret;
346 }
347 
348 int
349 main_send_player(uint16_t type, int fd, const void *data, uint16_t datalen)
350 {
351 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, datalen);
352 }
353 
354 int
355 main_play_song(const char *song)
356 {
357 	char path[PATH_MAX] = { 0 };
358 	int fd;
359 
360 	strlcpy(path, song, sizeof(path));
361 	if ((fd = open(path, O_RDONLY)) == -1) {
362 		log_warn("open %s", path);
363 		return 0;
364 	}
365 
366 	play_state = STATE_PLAYING;
367 	imsg_compose_event(iev_player, IMSG_PLAY, 0, 0, fd,
368 	    path, sizeof(path));
369 	return 1;
370 }
371 
372 void
373 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
374 {
375 	size_t datalen;
376 	char arg[PATH_MAX];
377 	const char *song;
378 
379 	datalen = IMSG_DATA_SIZE(*imsg);
380 	if (datalen != sizeof(arg)) {
381 		main_senderr(iev, "wrong size");
382 		return;
383 	}
384 
385 	memcpy(arg, imsg->data, sizeof(arg));
386 	if (arg[sizeof(arg)-1] != '\0') {
387 		main_senderr(iev, "data corrupted");
388 		return;
389 	}
390 
391 	song = playlist_jump(arg);
392 	if (song == NULL) {
393 		main_senderr(iev, "not found");
394 		return;
395 	}
396 
397 	main_send_player(IMSG_STOP, -1, NULL, 0);
398 	if (!main_play_song(song)) {
399 		main_senderr(iev, "can't play");
400 		playlist_dropcurrent();
401 		main_playlist_advance();
402 		return;
403 	}
404 
405 	main_send_status(iev);
406 }
407 
408 void
409 main_playlist_resume(void)
410 {
411 	const char *song;
412 
413 	if ((song = current_song) == NULL)
414 		song = playlist_advance();
415 
416 	for (; song != NULL; song = playlist_advance()) {
417 		if (main_play_song(song))
418 			return;
419 
420 		playlist_dropcurrent();
421 	}
422 }
423 
424 void
425 main_playlist_advance(void)
426 {
427 	const char *song;
428 
429 	for (;;) {
430 		song = playlist_advance();
431 		if (song == NULL)
432 			return;
433 
434 		if (main_play_song(song))
435 			break;
436 
437 		playlist_dropcurrent();
438 	}
439 }
440 
441 void
442 main_playlist_previous(void)
443 {
444 	const char *song;
445 
446 	for (;;) {
447 		song = playlist_previous();
448 		if (song == NULL)
449 			return;
450 
451 		if (main_play_song(song))
452 			break;
453 
454 		playlist_dropcurrent();
455 	}
456 }
457 
458 void
459 main_restart_track(void)
460 {
461 	const char *song;
462 
463 	song = current_song;
464 	if (song == NULL)
465 		return;
466 
467 	if (main_play_song(song))
468 		return;
469 
470 	playlist_dropcurrent();
471 	main_playlist_advance();
472 }
473 
474 void
475 main_senderr(struct imsgev *iev, const char *msg)
476 {
477 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
478 	    msg, strlen(msg)+1);
479 }
480 
481 void
482 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
483     struct imsg *imsg)
484 {
485 	size_t datalen;
486 	char path[PATH_MAX] = { 0 };
487 	const char *err = NULL;
488 
489 	datalen = IMSG_DATA_SIZE(*imsg);
490 	if (datalen != sizeof(path)) {
491 		err = "data size mismatch";
492 		goto err;
493 	}
494 
495 	memcpy(path, imsg->data, sizeof(path));
496 	if (path[datalen-1] != '\0') {
497 		err = "malformed data";
498 		goto err;
499 	}
500 
501 	if (tx)
502 		playlist_push(px, path);
503 	else
504 		playlist_enqueue(path);
505 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
506 	return;
507 err:
508 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1, err, strlen(err)+1);
509 }
510 
511 void
512 main_send_playlist(struct imsgev *iev)
513 {
514 	struct player_status s;
515 	size_t i;
516 
517 	for (i = 0; i < playlist.len; ++i) {
518 		memset(&s, 0, sizeof(s));
519 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
520 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
521 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
522 		    sizeof(s));
523 	}
524 
525 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
526 }
527 
528 void
529 main_send_status(struct imsgev *iev)
530 {
531 	struct player_status s;
532 
533 	memset(&s, 0, sizeof(s));
534 
535 	if (current_song != NULL)
536 		strlcpy(s.path, current_song, sizeof(s.path));
537 	s.status = play_state;
538 	s.rp.repeat_all = repeat_all;
539 	s.rp.repeat_one = repeat_one;
540 
541 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
542 }