op public repos

Blob

Date:: Tue Feb 22 12:07:24 2022 UTC
Message:: remove siginfo handling was useful for debugging but now ther's the `status' command for it.
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/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 			main_playlist_advance();
135 			if (play_state == STATE_PLAYING)
136 				control_notify(NULL, IMSG_CTL_NEXT);
137 			else
138 				control_notify(NULL, IMSG_CTL_STOP);
139 			break;
140 		case IMSG_EOF:
141 			if (repeat_one && current_song != NULL)
142 				if (main_play_song(current_song))
143 					break;
144 			main_playlist_advance();
145 			if (play_state == STATE_PLAYING)
146 				control_notify(NULL, IMSG_CTL_NEXT);
147 			else
148 				control_notify(NULL, IMSG_CTL_STOP);
149 			break;
150 
151 		default:
152 			log_debug("%s: error handling imsg %d", __func__,
153 			    imsg.hdr.type);
154 			break;
155 		}
156 		imsg_free(&imsg);
157 	}
158 
159 	if (!shut)
160 		imsg_event_add(iev);
161 	else {
162 		/* This pipe is dead.  Remove its event handler. */
163 		event_del(&iev->ev);
164 		event_loopexit(NULL);
165 	}
166 }
167 
168 static pid_t
169 start_child(enum amused_process proc, int fd)
170 {
171 	const char	*argv[6];
172 	int		 argc = 0;
173 	pid_t		 pid;
174 
175 	switch (pid = fork()) {
176 	case -1:
177 		fatal("cannot fork");
178 	case 0:
179 		break;
180 	default:
181 		close(fd);
182 		return pid;
183 	}
184 
185 	if (fd != 3) {
186 		if (fd != -1 && dup2(fd, 3) == -1)
187 			fatal("cannot setup imsg fd");
188 	} else if (fcntl(F_SETFD, 0) == -1)
189 		fatal("cannot setup imsg fd");
190 
191 	argv[argc++] = argv0;
192 
193 	switch (proc) {
194 	case PROC_MAIN:
195 		argv[argc++] = "-s";
196 		argv[argc++] = csock;
197 		break;
198 	case PROC_PLAYER:
199 		argv[argc++] = "-Tp";
200 		break;
201 	}
202 
203 	if (debug)
204 		argv[argc++] = "-d";
205 	if (verbose)
206 		argv[argc++] = "-v";
207 	argv[argc++] = NULL;
208 
209 	/* obnoxious casts */
210 	execvp(argv0, (char *const *)argv);
211 	fatal("execvp %s", argv0);
212 }
213 
214 /* daemon main routine */
215 static __dead int
216 amused_main(void)
217 {
218 	int	 pipe_main2player[2];
219 	int	 control_fd;
220 
221 	log_init(debug, LOG_DAEMON);
222 	log_setverbose(verbose);
223 	log_procinit("main");
224 
225 	if (!debug)
226 		daemon(1, 0);
227 
228 	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
229 	    PF_UNSPEC, pipe_main2player) == -1)
230 		fatal("socketpair");
231 
232 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
233 
234 	event_init();
235 
236 	signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
237 	signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
238 
239 	signal_add(&ev_sigint, NULL);
240 	signal_add(&ev_sigterm, NULL);
241 
242 	signal(SIGHUP, SIG_IGN);
243 	signal(SIGCHLD, SIG_IGN);
244 	signal(SIGPIPE, SIG_IGN);
245 
246 	iev_player = xmalloc(sizeof(*iev_player));
247 	imsg_init(&iev_player->ibuf, pipe_main2player[0]);
248 	iev_player->handler = main_dispatch_player;
249 	iev_player->events = EV_READ;
250 	event_set(&iev_player->ev, iev_player->ibuf.fd, iev_player->events,
251 	    iev_player->handler, iev_player);
252 	event_add(&iev_player->ev, NULL);
253 
254 	if ((control_fd = control_init(csock)) == -1)
255 		fatal("control socket setup failed %s", csock);
256 	control_listen(control_fd);
257 
258 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
259 		fatal("pledge");
260 
261 	log_info("startup");
262 	event_dispatch();
263 	main_shutdown();
264 }
265 
266 int
267 main(int argc, char **argv)
268 {
269 	int ch, proc = PROC_MAIN;
270 
271 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
272 	log_setverbose(1);
273 
274 	argv0 = argv[0];
275 	if (argv0 == NULL)
276 		argv0 = "amused";
277 
278 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
279 		switch (ch) {
280 		case 'd':
281 			debug = 1;
282 			break;
283 		case 's':
284 			free(csock);
285 			csock = xstrdup(optarg);
286 			break;
287 		case 'T':
288 			switch (*optarg) {
289 			case 'p':
290 				proc = PROC_PLAYER;
291 				break;
292 			default:
293 				usage();
294 			}
295 			break;
296 		case 'v':
297 			verbose++;
298 			break;
299 		default:
300 			usage();
301 		}
302 	}
303 	argv += optind;
304 	argc -= optind;
305 
306 	if (proc == PROC_PLAYER)
307 		exit(player(debug, verbose));
308 
309 	if (csock == NULL)
310 		xasprintf(&csock, "/tmp/amused-%d", getuid());
311 
312 	if (argc == 0)
313 		amused_main();
314 	else
315 		ctl(argc, argv);
316 	return 0;
317 }
318 
319 void
320 spawn_daemon(void)
321 {
322 	debug = 0;
323 	start_child(PROC_MAIN, -1);
324 }
325 
326 void
327 imsg_event_add(struct imsgev *iev)
328 {
329 	iev->events = EV_READ;
330 	if (iev->ibuf.w.queued)
331 		iev->events |= EV_WRITE;
332 
333 	event_del(&iev->ev);
334 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
335 	event_add(&iev->ev, NULL);
336 }
337 
338 int
339 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
340     pid_t pid, int fd, const void *data, uint16_t datalen)
341 {
342 	int ret;
343 
344 	if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
345 	    datalen)) != -1)
346 		imsg_event_add(iev);
347 
348 	return ret;
349 }
350 
351 int
352 main_send_player(uint16_t type, int fd, const void *data, uint16_t datalen)
353 {
354 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, datalen);
355 }
356 
357 int
358 main_play_song(const char *song)
359 {
360 	char path[PATH_MAX] = { 0 };
361 	int fd;
362 
363 	strlcpy(path, song, sizeof(path));
364 	if ((fd = open(path, O_RDONLY)) == -1) {
365 		log_warn("open %s", path);
366 		return 0;
367 	}
368 
369 	play_state = STATE_PLAYING;
370 	imsg_compose_event(iev_player, IMSG_PLAY, 0, 0, fd,
371 	    path, sizeof(path));
372 	return 1;
373 }
374 
375 void
376 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
377 {
378 	size_t datalen;
379 	char arg[PATH_MAX];
380 	const char *song;
381 
382 	datalen = IMSG_DATA_SIZE(*imsg);
383 	if (datalen != sizeof(arg)) {
384 		main_senderr(iev, "wrong size");
385 		return;
386 	}
387 
388 	memcpy(arg, imsg->data, sizeof(arg));
389 	if (arg[sizeof(arg)-1] != '\0') {
390 		main_senderr(iev, "data corrupted");
391 		return;
392 	}
393 
394 	song = playlist_jump(arg);
395 	if (song == NULL) {
396 		main_senderr(iev, "not found");
397 		return;
398 	}
399 
400 	main_send_player(IMSG_STOP, -1, NULL, 0);
401 	if (!main_play_song(song)) {
402 		main_senderr(iev, "can't play");
403 		playlist_dropcurrent();
404 		main_playlist_advance();
405 		return;
406 	}
407 
408 	main_send_status(iev);
409 }
410 
411 void
412 main_playlist_resume(void)
413 {
414 	const char *song;
415 
416 	if ((song = current_song) == NULL)
417 		song = playlist_advance();
418 
419 	for (; song != NULL; song = playlist_advance()) {
420 		if (main_play_song(song))
421 			return;
422 
423 		playlist_dropcurrent();
424 	}
425 }
426 
427 void
428 main_playlist_advance(void)
429 {
430 	const char *song;
431 
432 	for (;;) {
433 		song = playlist_advance();
434 		if (song == NULL)
435 			return;
436 
437 		if (main_play_song(song))
438 			break;
439 
440 		playlist_dropcurrent();
441 	}
442 }
443 
444 void
445 main_playlist_previous(void)
446 {
447 	const char *song;
448 
449 	for (;;) {
450 		song = playlist_previous();
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_restart_track(void)
463 {
464 	const char *song;
465 
466 	song = current_song;
467 	if (song == NULL)
468 		return;
469 
470 	if (main_play_song(song))
471 		return;
472 
473 	playlist_dropcurrent();
474 	main_playlist_advance();
475 }
476 
477 void
478 main_senderr(struct imsgev *iev, const char *msg)
479 {
480 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1,
481 	    msg, strlen(msg)+1);
482 }
483 
484 void
485 main_enqueue(int tx, struct playlist *px, struct imsgev *iev,
486     struct imsg *imsg)
487 {
488 	size_t datalen;
489 	char path[PATH_MAX] = { 0 };
490 	const char *err = NULL;
491 
492 	datalen = IMSG_DATA_SIZE(*imsg);
493 	if (datalen != sizeof(path)) {
494 		err = "data size mismatch";
495 		goto err;
496 	}
497 
498 	memcpy(path, imsg->data, sizeof(path));
499 	if (path[datalen-1] != '\0') {
500 		err = "malformed data";
501 		goto err;
502 	}
503 
504 	if (tx)
505 		playlist_push(px, path);
506 	else
507 		playlist_enqueue(path);
508 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
509 	return;
510 err:
511 	imsg_compose_event(iev, IMSG_CTL_ERR, 0, 0, -1, err, strlen(err)+1);
512 }
513 
514 void
515 main_send_playlist(struct imsgev *iev)
516 {
517 	struct player_status s;
518 	size_t i;
519 
520 	for (i = 0; i < playlist.len; ++i) {
521 		memset(&s, 0, sizeof(s));
522 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
523 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
524 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
525 		    sizeof(s));
526 	}
527 
528 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
529 }
530 
531 void
532 main_send_status(struct imsgev *iev)
533 {
534 	struct player_status s;
535 
536 	memset(&s, 0, sizeof(s));
537 
538 	if (current_song != NULL)
539 		strlcpy(s.path, current_song, sizeof(s.path));
540 	s.status = play_state;
541 	s.rp.repeat_all = repeat_all;
542 	s.rp.repeat_one = repeat_one;
543 
544 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
545 }