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Date:: Wed Mar 9 09:16:36 2022 UTC
Message:: drop functions prototypes private to player.c and move hdl there too
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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/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 <sndio.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <stdint.h>
33 #include <string.h>
34 #include <syslog.h>
35 #include <unistd.h>
36 #include <imsg.h>
37 
38 #include "amused.h"
39 #include "control.h"
40 #include "log.h"
41 #include "playlist.h"
42 #include "xmalloc.h"
43 
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 		default:
148 			log_debug("%s: error handling imsg %d", __func__,
149 			    imsg.hdr.type);
150 			break;
151 		}
152 		imsg_free(&imsg);
153 	}
154 
155 	if (!shut)
156 		imsg_event_add(iev);
157 	else {
158 		/* This pipe is dead.  Remove its event handler. */
159 		event_del(&iev->ev);
160 		event_loopexit(NULL);
161 	}
162 }
163 
164 static pid_t
165 start_child(enum amused_process proc, int fd)
166 {
167 	const char	*argv[7];
168 	int		 argc = 0;
169 	pid_t		 pid;
170 
171 	if (fd == -1 && debug)
172 		goto exec;
173 
174 	switch (pid = fork()) {
175 	case -1:
176 		fatal("cannot fork");
177 	case 0:
178 		break;
179 	default:
180 		close(fd);
181 		return pid;
182 	}
183 
184 	if (fd != 3) {
185 		if (fd != -1 && dup2(fd, 3) == -1)
186 			fatal("cannot setup imsg fd");
187 	} else if (fcntl(F_SETFD, 0) == -1)
188 		fatal("cannot setup imsg fd");
189 
190 exec:
191 	argv[argc++] = argv0;
192 
193 	switch (proc) {
194 	case PROC_MAIN:
195 		argv[argc++] = "-s";
196 		argv[argc++] = csock;
197 		argv[argc++] = "-Tm";
198 		break;
199 	case PROC_PLAYER:
200 		argv[argc++] = "-Tp";
201 		break;
202 	}
203 
204 	if (debug)
205 		argv[argc++] = "-d";
206 	if (verbose)
207 		argv[argc++] = "-v";
208 	argv[argc++] = NULL;
209 
210 	/* obnoxious casts */
211 	execvp(argv0, (char *const *)argv);
212 	fatal("execvp %s", argv0);
213 }
214 
215 /* daemon main routine */
216 static __dead int
217 amused_main(void)
218 {
219 	int	 pipe_main2player[2];
220 	int	 control_fd;
221 
222 	log_init(debug, LOG_DAEMON);
223 	log_setverbose(verbose);
224 	log_procinit("main");
225 
226 	if (!debug)
227 		daemon(1, 0);
228 
229 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
230 	    PF_UNSPEC, pipe_main2player) == -1)
231 		fatal("socketpair");
232 
233 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
234 
235 	event_init();
236 
237 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
238 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
239 
240 	signal_add(&ev_sigint, NULL);
241 	signal_add(&ev_sigterm, NULL);
242 
243 	signal(SIGHUP, SIG_IGN);
244 	signal(SIGCHLD, SIG_IGN);
245 	signal(SIGPIPE, SIG_IGN);
246 
247 	iev_player = xmalloc(sizeof(*iev_player));
248 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
249 	iev_player->handler = main_dispatch_player;
250 	iev_player->events = EV_READ;
251 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
252 	    iev_player->handler, iev_player);
253 	event_add(&iev_player->ev, NULL);
254 
255 	if ((control_fd = control_init(csock)) == -1)
256 		fatal("control socket setup failed %s", csock);
257 	control_listen(control_fd);
258 
259 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
260 		fatal("pledge");
261 
262 	log_info("startup");
263 	event_dispatch();
264 	main_shutdown();
265 }
266 
267 int
268 main(int argc, char **argv)
269 {
270 	int ch, proc = -1;
271 
272 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
273 	log_setverbose(1);
274 
275 	argv0 = argv[0];
276 	if (argv0 == NULL)
277 		argv0 = "amused";
278 
279 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
280 		switch (ch) {
281 		case 'd':
282 			debug = 1;
283 			break;
284 		case 's':
285 			free(csock);
286 			csock = xstrdup(optarg);
287 			break;
288 		case 'T':
289 			switch (*optarg) {
290 			case 'm':
291 				proc = PROC_MAIN;
292 				break;
293 			case 'p':
294 				proc = PROC_PLAYER;
295 				break;
296 			default:
297 				usage();
298 			}
299 			break;
300 		case 'v':
301 			verbose++;
302 			break;
303 		default:
304 			usage();
305 		}
306 	}
307 	argv += optind;
308 	argc -= optind;
309 
310 	if (proc == PROC_MAIN)
311 		amused_main();
312 	if (proc == PROC_PLAYER)
313 		exit(player(debug, verbose));
314 
315 	if (csock == NULL)
316 		xasprintf(&csock, "/tmp/amused-%d", getuid());
317 
318 	if (argc > 0)
319 		debug = 0;
320 
321 	ctl(argc, argv);
322 }
323 
324 void
325 spawn_daemon(void)
326 {
327 	start_child(PROC_MAIN, -1);
328 }
329 
330 void
331 imsg_event_add(struct imsgev *iev)
332 {
333 	iev->events = EV_READ;
334 	if (iev->ibuf.w.queued)
335 		iev->events |= EV_WRITE;
336 
337 	event_del(&iev->ev);
338 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
339 	event_add(&iev->ev, NULL);
340 }
341 
342 int
343 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
344     pid_t pid, int fd, const void *data, uint16_t datalen)
345 {
346 	int ret;
347 
348 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
349 	    datalen)) != -1)
350 		imsg_event_add(iev);
351 
352 	return ret;
353 }
354 
355 int
356 main_send_player(uint16_t type, int fd, const void *data, uint16_t datalen)
357 {
358 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, datalen);
359 }
360 
361 int
362 main_play_song(const char *song)
363 {
364 	struct stat sb;
365 	char path[PATH_MAX] = { 0 };
366 	int fd;
367 
368 	strlcpy(path, song, sizeof(path));
369 	if ((fd = open(path, O_RDONLY)) == -1) {
370 		log_warn("open %s", path);
371 		return 0;
372 	}
373 
374 	if (fstat(fd, &sb) == -1) {
375 		log_warn("failed to stat %s", path);
376 		close(fd);
377 		return 0;
378 	}
379 
380 	if (S_ISDIR(sb.st_mode)) {
381 		log_info("skipping a directory: %s", path);
382 		close(fd);
383 		return 0;
384 	}
385 
386 	play_state = STATE_PLAYING;
387 	imsg_compose_event(iev_player, IMSG_PLAY, 0, 0, fd,
388 	    path, sizeof(path));
389 	return 1;
390 }
391 
392 void
393 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
394 {
395 	size_t datalen;
396 	char arg[PATH_MAX];
397 	const char *song;
398 
399 	datalen = IMSG_DATA_SIZE(*imsg);
400 	if (datalen != sizeof(arg)) {
401 		main_senderr(iev, "wrong size");
402 		return;
403 	}
404 
405 	memcpy(arg, imsg->data, sizeof(arg));
406 	if (arg[sizeof(arg)-1] != '\0') {
407 		main_senderr(iev, "data corrupted");
408 		return;
409 	}
410 
411 	song = playlist_jump(arg);
412 	if (song == NULL) {
413 		main_senderr(iev, "not found");
414 		return;
415 	}
416 
417 	main_send_player(IMSG_STOP, -1, NULL, 0);
418 	if (!main_play_song(song)) {
419 		main_senderr(iev, "can't play");
420 		playlist_dropcurrent();
421 		main_playlist_advance();
422 		return;
423 	}
424 
425 	main_send_status(iev);
426 }
427 
428 void
429 main_playlist_resume(void)
430 {
431 	const char *song;
432 
433 	if ((song = current_song) == NULL)
434 		song = playlist_advance();
435 
436 	for (; song != NULL; song = playlist_advance()) {
437 		if (main_play_song(song))
438 			return;
439 
440 		playlist_dropcurrent();
441 	}
442 }
443 
444 void
445 main_playlist_advance(void)
446 {
447 	const char *song;
448 
449 	for (;;) {
450 		song = playlist_advance();
451 		if (song == NULL)
452 			return;
453 
454 		if (main_play_song(song))
455 			break;
456 
457 		playlist_dropcurrent();
458 	}
459 }
460 
461 void
462 main_playlist_previous(void)
463 {
464 	const char *song;
465 
466 	for (;;) {
467 		song = playlist_previous();
468 		if (song == NULL)
469 			return;
470 
471 		if (main_play_song(song))
472 			break;
473 
474 		playlist_dropcurrent();
475 	}
476 }
477 
478 void
479 main_restart_track(void)
480 {
481 	const char *song;
482 
483 	song = current_song;
484 	if (song == NULL)
485 		return;
486 
487 	if (main_play_song(song))
488 		return;
489 
490 	playlist_dropcurrent();
491 	main_playlist_advance();
492 }
493 
494 void
495 main_senderr(struct imsgev *iev, const char *msg)
496 {
497 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
498 	    msg, strlen(msg)+1);
499 }
500 
501 void
502 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
503     struct imsg *imsg)
504 {
505 	size_t datalen;
506 	char path[PATH_MAX] = { 0 };
507 	const char *err = NULL;
508 
509 	datalen = IMSG_DATA_SIZE(*imsg);
510 	if (datalen != sizeof(path)) {
511 		err = "data size mismatch";
512 		goto err;
513 	}
514 
515 	memcpy(path, imsg->data, sizeof(path));
516 	if (path[datalen-1] != '\0') {
517 		err = "malformed data";
518 		goto err;
519 	}
520 
521 	if (tx)
522 		playlist_push(px, path);
523 	else
524 		playlist_enqueue(path);
525 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
526 	return;
527 err:
528 	main_senderr(iev, err);
529 }
530 
531 void
532 main_send_playlist(struct imsgev *iev)
533 {
534 	struct player_status s;
535 	size_t i;
536 
537 	for (i = 0; i < playlist.len; ++i) {
538 		memset(&s, 0, sizeof(s));
539 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
540 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
541 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
542 		    sizeof(s));
543 	}
544 
545 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
546 }
547 
548 void
549 main_send_status(struct imsgev *iev)
550 {
551 	struct player_status s;
552 
553 	memset(&s, 0, sizeof(s));
554 
555 	if (current_song != NULL)
556 		strlcpy(s.path, current_song, sizeof(s.path));
557 	s.status = play_state;
558 	s.rp.repeat_all = repeat_all;
559 	s.rp.repeat_one = repeat_one;
560 
561 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
562 }