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Date:: Tue Feb 22 12:16:26 2022 UTC
Message:: unify IMSG_ERR and IMSG_EOF handling IMSG_ERR needs a playlist_dropcurrent(), but otherwise is just the same as IMSG_EOF: the current song ended and we need to move forward. To unify, set current_song to NULL in playlist_dropcurrent, which make sense since right after it we're not playing anything.
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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 			main_playlist_advance();
140 			if (play_state == STATE_PLAYING)
141 				control_notify(NULL, IMSG_CTL_NEXT);
142 			else
143 				control_notify(NULL, IMSG_CTL_STOP);
144 			break;
145 
146 		default:
147 			log_debug("%s: error handling imsg %d", __func__,
148 			    imsg.hdr.type);
149 			break;
150 		}
151 		imsg_free(&imsg);
152 	}
153 
154 	if (!shut)
155 		imsg_event_add(iev);
156 	else {
157 		/* This pipe is dead.  Remove its event handler. */
158 		event_del(&iev->ev);
159 		event_loopexit(NULL);
160 	}
161 }
162 
163 static pid_t
164 start_child(enum amused_process proc, int fd)
165 {
166 	const char	*argv[6];
167 	int		 argc = 0;
168 	pid_t		 pid;
169 
170 	switch (pid = fork()) {
171 	case -1:
172 		fatal("cannot fork");
173 	case 0:
174 		break;
175 	default:
176 		close(fd);
177 		return pid;
178 	}
179 
180 	if (fd != 3) {
181 		if (fd != -1 && dup2(fd, 3) == -1)
182 			fatal("cannot setup imsg fd");
183 	} else if (fcntl(F_SETFD, 0) == -1)
184 		fatal("cannot setup imsg fd");
185 
186 	argv[argc++] = argv0;
187 
188 	switch (proc) {
189 	case PROC_MAIN:
190 		argv[argc++] = "-s";
191 		argv[argc++] = csock;
192 		break;
193 	case PROC_PLAYER:
194 		argv[argc++] = "-Tp";
195 		break;
196 	}
197 
198 	if (debug)
199 		argv[argc++] = "-d";
200 	if (verbose)
201 		argv[argc++] = "-v";
202 	argv[argc++] = NULL;
203 
204 	/* obnoxious casts */
205 	execvp(argv0, (char *const *)argv);
206 	fatal("execvp %s", argv0);
207 }
208 
209 /* daemon main routine */
210 static __dead int
211 amused_main(void)
212 {
213 	int	 pipe_main2player[2];
214 	int	 control_fd;
215 
216 	log_init(debug, LOG_DAEMON);
217 	log_setverbose(verbose);
218 	log_procinit("main");
219 
220 	if (!debug)
221 		daemon(1, 0);
222 
223 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
224 	    PF_UNSPEC, pipe_main2player) == -1)
225 		fatal("socketpair");
226 
227 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
228 
229 	event_init();
230 
231 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
232 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
233 
234 	signal_add(&ev_sigint, NULL);
235 	signal_add(&ev_sigterm, NULL);
236 
237 	signal(SIGHUP, SIG_IGN);
238 	signal(SIGCHLD, SIG_IGN);
239 	signal(SIGPIPE, SIG_IGN);
240 
241 	iev_player = xmalloc(sizeof(*iev_player));
242 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
243 	iev_player->handler = main_dispatch_player;
244 	iev_player->events = EV_READ;
245 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
246 	    iev_player->handler, iev_player);
247 	event_add(&iev_player->ev, NULL);
248 
249 	if ((control_fd = control_init(csock)) == -1)
250 		fatal("control socket setup failed %s", csock);
251 	control_listen(control_fd);
252 
253 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
254 		fatal("pledge");
255 
256 	log_info("startup");
257 	event_dispatch();
258 	main_shutdown();
259 }
260 
261 int
262 main(int argc, char **argv)
263 {
264 	int ch, proc = PROC_MAIN;
265 
266 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
267 	log_setverbose(1);
268 
269 	argv0 = argv[0];
270 	if (argv0 == NULL)
271 		argv0 = "amused";
272 
273 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
274 		switch (ch) {
275 		case 'd':
276 			debug = 1;
277 			break;
278 		case 's':
279 			free(csock);
280 			csock = xstrdup(optarg);
281 			break;
282 		case 'T':
283 			switch (*optarg) {
284 			case 'p':
285 				proc = PROC_PLAYER;
286 				break;
287 			default:
288 				usage();
289 			}
290 			break;
291 		case 'v':
292 			verbose++;
293 			break;
294 		default:
295 			usage();
296 		}
297 	}
298 	argv += optind;
299 	argc -= optind;
300 
301 	if (proc == PROC_PLAYER)
302 		exit(player(debug, verbose));
303 
304 	if (csock == NULL)
305 		xasprintf(&csock, "/tmp/amused-%d", getuid());
306 
307 	if (argc == 0)
308 		amused_main();
309 	else
310 		ctl(argc, argv);
311 	return 0;
312 }
313 
314 void
315 spawn_daemon(void)
316 {
317 	debug = 0;
318 	start_child(PROC_MAIN, -1);
319 }
320 
321 void
322 imsg_event_add(struct imsgev *iev)
323 {
324 	iev->events = EV_READ;
325 	if (iev->ibuf.w.queued)
326 		iev->events |= EV_WRITE;
327 
328 	event_del(&iev->ev);
329 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
330 	event_add(&iev->ev, NULL);
331 }
332 
333 int
334 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
335     pid_t pid, int fd, const void *data, uint16_t datalen)
336 {
337 	int ret;
338 
339 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
340 	    datalen)) != -1)
341 		imsg_event_add(iev);
342 
343 	return ret;
344 }
345 
346 int
347 main_send_player(uint16_t type, int fd, const void *data, uint16_t datalen)
348 {
349 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, datalen);
350 }
351 
352 int
353 main_play_song(const char *song)
354 {
355 	char path[PATH_MAX] = { 0 };
356 	int fd;
357 
358 	strlcpy(path, song, sizeof(path));
359 	if ((fd = open(path, O_RDONLY)) == -1) {
360 		log_warn("open %s", path);
361 		return 0;
362 	}
363 
364 	play_state = STATE_PLAYING;
365 	imsg_compose_event(iev_player, IMSG_PLAY, 0, 0, fd,
366 	    path, sizeof(path));
367 	return 1;
368 }
369 
370 void
371 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
372 {
373 	size_t datalen;
374 	char arg[PATH_MAX];
375 	const char *song;
376 
377 	datalen = IMSG_DATA_SIZE(*imsg);
378 	if (datalen != sizeof(arg)) {
379 		main_senderr(iev, "wrong size");
380 		return;
381 	}
382 
383 	memcpy(arg, imsg->data, sizeof(arg));
384 	if (arg[sizeof(arg)-1] != '\0') {
385 		main_senderr(iev, "data corrupted");
386 		return;
387 	}
388 
389 	song = playlist_jump(arg);
390 	if (song == NULL) {
391 		main_senderr(iev, "not found");
392 		return;
393 	}
394 
395 	main_send_player(IMSG_STOP, -1, NULL, 0);
396 	if (!main_play_song(song)) {
397 		main_senderr(iev, "can't play");
398 		playlist_dropcurrent();
399 		main_playlist_advance();
400 		return;
401 	}
402 
403 	main_send_status(iev);
404 }
405 
406 void
407 main_playlist_resume(void)
408 {
409 	const char *song;
410 
411 	if ((song = current_song) == NULL)
412 		song = playlist_advance();
413 
414 	for (; song != NULL; song = playlist_advance()) {
415 		if (main_play_song(song))
416 			return;
417 
418 		playlist_dropcurrent();
419 	}
420 }
421 
422 void
423 main_playlist_advance(void)
424 {
425 	const char *song;
426 
427 	for (;;) {
428 		song = playlist_advance();
429 		if (song == NULL)
430 			return;
431 
432 		if (main_play_song(song))
433 			break;
434 
435 		playlist_dropcurrent();
436 	}
437 }
438 
439 void
440 main_playlist_previous(void)
441 {
442 	const char *song;
443 
444 	for (;;) {
445 		song = playlist_previous();
446 		if (song == NULL)
447 			return;
448 
449 		if (main_play_song(song))
450 			break;
451 
452 		playlist_dropcurrent();
453 	}
454 }
455 
456 void
457 main_restart_track(void)
458 {
459 	const char *song;
460 
461 	song = current_song;
462 	if (song == NULL)
463 		return;
464 
465 	if (main_play_song(song))
466 		return;
467 
468 	playlist_dropcurrent();
469 	main_playlist_advance();
470 }
471 
472 void
473 main_senderr(struct imsgev *iev, const char *msg)
474 {
475 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
476 	    msg, strlen(msg)+1);
477 }
478 
479 void
480 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
481     struct imsg *imsg)
482 {
483 	size_t datalen;
484 	char path[PATH_MAX] = { 0 };
485 	const char *err = NULL;
486 
487 	datalen = IMSG_DATA_SIZE(*imsg);
488 	if (datalen != sizeof(path)) {
489 		err = "data size mismatch";
490 		goto err;
491 	}
492 
493 	memcpy(path, imsg->data, sizeof(path));
494 	if (path[datalen-1] != '\0') {
495 		err = "malformed data";
496 		goto err;
497 	}
498 
499 	if (tx)
500 		playlist_push(px, path);
501 	else
502 		playlist_enqueue(path);
503 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
504 	return;
505 err:
506 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1, err, strlen(err)+1);
507 }
508 
509 void
510 main_send_playlist(struct imsgev *iev)
511 {
512 	struct player_status s;
513 	size_t i;
514 
515 	for (i = 0; i < playlist.len; ++i) {
516 		memset(&s, 0, sizeof(s));
517 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
518 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
519 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
520 		    sizeof(s));
521 	}
522 
523 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
524 }
525 
526 void
527 main_send_status(struct imsgev *iev)
528 {
529 	struct player_status s;
530 
531 	memset(&s, 0, sizeof(s));
532 
533 	if (current_song != NULL)
534 		strlcpy(s.path, current_song, sizeof(s.path));
535 	s.status = play_state;
536 	s.rp.repeat_all = repeat_all;
537 	s.rp.repeat_one = repeat_one;
538 
539 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
540 }