op public repos

Blob

Date:: Sun Apr 14 08:34:50 2024 UTC
Message:: bring in newer ev and bufio from telescope merge our local changes to bufio though.
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
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 "ev.h"
37 #include "log.h"
38 #include "playlist.h"
39 #include "xmalloc.h"
40 
41 char		*csock = NULL;
42 int		 debug;
43 int		 verbose;
44 struct imsgev	*iev_player;
45 
46 const char	*argv0;
47 pid_t		 player_pid;
48 
49 enum amused_process {
50 	PROC_MAIN,
51 	PROC_PLAYER,
52 };
53 
54 static __dead void
55 main_shutdown(void)
56 {
57 	pid_t	pid;
58 	int	status;
59 
60 	/* close pipes. */
61 	msgbuf_clear(&iev_player->imsgbuf.w);
62 	close(iev_player->imsgbuf.fd);
63 	free(iev_player);
64 
65 	log_debug("waiting for children to terminate");
66 	do {
67 		pid = wait(&status);
68 		if (pid == -1) {
69 			if (errno != EINTR && errno != ECHILD)
70 				fatal("wait");
71 		} else if (WIFSIGNALED(status))
72 			log_warnx("player terminated; signal %d",
73 			    WTERMSIG(status));
74 	} while (pid != -1 || (pid == -1 && errno == EINTR));
75 
76 	log_info("terminating");
77 	exit(0);
78 }
79 
80 static void
81 main_sig_handler(int sig, int event, void *arg)
82 {
83 	/*
84 	 * Normal signal handler rules don't apply because ev.c
85 	 * decouples for us.
86 	 */
87 
88 	switch (sig) {
89 	case SIGTERM:
90 	case SIGINT:
91 		main_shutdown();
92 		break;
93 	default:
94 		fatalx("unexpected signal %d", sig);
95 	}
96 }
97 
98 static void
99 main_dispatch_player(int sig, int event, void *d)
100 {
101 	char		*errstr;
102 	struct imsgev	*iev = d;
103 	struct imsgbuf	*imsgbuf = &iev->imsgbuf;
104 	struct imsg	 imsg;
105 	struct ibuf	 ibuf;
106 	size_t		 datalen;
107 	ssize_t		 n;
108 	int		 shut = 0;
109 
110 	if (event & EV_READ) {
111 		if ((n = imsg_read(imsgbuf)) == -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(&imsgbuf->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(imsgbuf, &imsg)) == -1)
125 			fatal("imsg_get");
126 		if (n == 0)	/* No more messages. */
127 			break;
128 
129 		switch (imsg_get_type(&imsg)) {
130 		case IMSG_POS:
131 			if (imsg_get_data(&imsg, &current_position,
132 			    sizeof(current_position)) == -1)
133 				fatalx("IMSG_POS: got wrong size");
134 			if (current_position < 0)
135 				current_position = -1;
136 			control_notify(IMSG_CTL_SEEK);
137 			break;
138 		case IMSG_LEN:
139 			if (imsg_get_data(&imsg, &current_duration,
140 			    sizeof(current_duration)) == -1)
141 				fatalx("IMSG_LEN: got wrong size");
142 			if (current_duration < 0)
143 				current_duration = -1;
144 			break;
145 		case IMSG_ERR:
146 			if (imsg_get_ibuf(&imsg, &ibuf) == -1 ||
147 			    (datalen = ibuf_size(&ibuf)) == 0)
148 				errstr = "unknown error";
149 			else {
150 				errstr = ibuf_data(&ibuf);
151 				errstr[datalen-1] = '\0';
152 			}
153 			log_warnx("%s; skipping %s", errstr, current_song);
154 			playlist_dropcurrent();
155 			main_playlist_advance();
156 			if (play_state == STATE_PLAYING)
157 				control_notify(IMSG_CTL_NEXT);
158 			else
159 				control_notify(IMSG_CTL_STOP);
160 			break;
161 		case IMSG_EOF:
162 			if (repeat_one && main_play_song(current_song))
163 				break;
164 			else if (repeat_one || consume)
165 				playlist_dropcurrent();
166 			main_playlist_advance();
167 			if (play_state == STATE_PLAYING)
168 				control_notify(IMSG_CTL_NEXT);
169 			else
170 				control_notify(IMSG_CTL_STOP);
171 			break;
172 		default:
173 			log_debug("%s: error handling imsg %d", __func__,
174 			    imsg_get_type(&imsg));
175 			break;
176 		}
177 		imsg_free(&imsg);
178 	}
179 
180 	if (shut)
181 		ev_break();
182 	else
183 		imsg_event_add(iev);
184 }
185 
186 static pid_t
187 start_child(enum amused_process proc, int fd)
188 {
189 	const char	*argv[7];
190 	int		 argc = 0;
191 	pid_t		 pid;
192 
193 	if (fd == -1 && debug)
194 		goto exec;
195 
196 	switch (pid = fork()) {
197 	case -1:
198 		fatal("cannot fork");
199 	case 0:
200 		break;
201 	default:
202 		close(fd);
203 		return pid;
204 	}
205 
206 	if (fd != 3) {
207 		if (fd != -1 && dup2(fd, 3) == -1)
208 			fatal("cannot setup imsg fd");
209 	} else if (fcntl(F_SETFD, 0) == -1)
210 		fatal("cannot setup imsg fd");
211 
212 exec:
213 	argv[argc++] = argv0;
214 
215 	switch (proc) {
216 	case PROC_MAIN:
217 		argv[argc++] = "-s";
218 		argv[argc++] = csock;
219 		argv[argc++] = "-Tm";
220 		break;
221 	case PROC_PLAYER:
222 		argv[argc++] = "-Tp";
223 		break;
224 	}
225 
226 	if (debug)
227 		argv[argc++] = "-d";
228 	if (verbose)
229 		argv[argc++] = "-v";
230 	argv[argc++] = NULL;
231 
232 	/* obnoxious casts */
233 	execvp(argv0, (char *const *)argv);
234 	fatal("execvp %s", argv0);
235 }
236 
237 /* daemon main routine */
238 static __dead void
239 amused_main(void)
240 {
241 	int	 pipe_main2player[2];
242 	int	 control_fd, flags;
243 
244 	log_init(debug, LOG_DAEMON);
245 	log_setverbose(verbose);
246 	log_procinit("main");
247 
248 	if (!debug && daemon(1, 0) == -1)
249 		fatal("daemon");
250 
251 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_main2player) == -1)
252 		fatal("socketpair");
253 
254 	if ((flags = fcntl(pipe_main2player[0], F_GETFL)) == -1 ||
255 	    fcntl(pipe_main2player[0], F_SETFL, flags | O_NONBLOCK) == -1 ||
256 	    (flags = fcntl(pipe_main2player[1], F_GETFL)) == -1 ||
257 	    fcntl(pipe_main2player[1], F_SETFL, flags | O_NONBLOCK) == -1)
258 		fatal("fcntl(O_NONBLOCK)");
259 
260 	if (fcntl(pipe_main2player[0], F_SETFD, FD_CLOEXEC) == -1 ||
261 	    fcntl(pipe_main2player[1], F_SETFD, FD_CLOEXEC) == -1)
262 		fatal("fcntl(CLOEXEC)");
263 
264 	player_pid = start_child(PROC_PLAYER, pipe_main2player[1]);
265 
266 	if (ev_init() == -1)
267 		fatal("ev_init");
268 
269 	signal(SIGHUP, SIG_IGN);
270 	signal(SIGCHLD, SIG_IGN);
271 	signal(SIGPIPE, SIG_IGN);
272 
273 	ev_signal(SIGINT, main_sig_handler, NULL);
274 	ev_signal(SIGTERM, main_sig_handler, NULL);
275 
276 	iev_player = xmalloc(sizeof(*iev_player));
277 	imsg_init(&iev_player->imsgbuf, pipe_main2player[0]);
278 	iev_player->handler = main_dispatch_player;
279 	iev_player->events = EV_READ;
280 	ev_add(iev_player->imsgbuf.fd, iev_player->events,
281 	    iev_player->handler, iev_player);
282 
283 	if ((control_fd = control_init(csock)) == -1)
284 		fatal("control socket setup failed %s", csock);
285 	control_listen(control_fd);
286 
287 	if (pledge("stdio rpath unix sendfd", NULL) == -1)
288 		fatal("pledge");
289 
290 	log_info("startup");
291 	ev_loop();
292 	main_shutdown();
293 }
294 
295 int
296 main(int argc, char **argv)
297 {
298 	int ch, proc = -1;
299 
300 	log_init(1, LOG_DAEMON);	/* Log to stderr until daemonized */
301 	log_setverbose(1);
302 
303 	argv0 = argv[0];
304 	if (argv0 == NULL)
305 		argv0 = "amused";
306 
307 	while ((ch = getopt(argc, argv, "ds:T:v")) != -1) {
308 		switch (ch) {
309 		case 'd':
310 			debug = 1;
311 			break;
312 		case 's':
313 			free(csock);
314 			csock = xstrdup(optarg);
315 			break;
316 		case 'T':
317 			switch (*optarg) {
318 			case 'm':
319 				proc = PROC_MAIN;
320 				break;
321 			case 'p':
322 				proc = PROC_PLAYER;
323 				break;
324 			default:
325 				usage();
326 			}
327 			break;
328 		case 'v':
329 			verbose++;
330 			break;
331 		default:
332 			usage();
333 		}
334 	}
335 	argv += optind;
336 	argc -= optind;
337 
338 	if (proc == PROC_MAIN)
339 		amused_main();
340 	if (proc == PROC_PLAYER)
341 		exit(player(debug, verbose));
342 
343 	if (csock == NULL) {
344 		const char *tmpdir;
345 
346 		if ((tmpdir = getenv("TMPDIR")) == NULL)
347 			tmpdir = "/tmp";
348 
349 		xasprintf(&csock, "%s/amused-%d", tmpdir, getuid());
350 	}
351 
352 	if (argc > 0)
353 		debug = 0;
354 
355 	ctl(argc, argv);
356 }
357 
358 void
359 spawn_daemon(void)
360 {
361 	start_child(PROC_MAIN, -1);
362 }
363 
364 void
365 imsg_event_add(struct imsgev *iev)
366 {
367 	iev->events = EV_READ;
368 	if (iev->imsgbuf.w.queued)
369 		iev->events |= EV_WRITE;
370 
371 	ev_add(iev->imsgbuf.fd, iev->events, iev->handler, iev);
372 }
373 
374 int
375 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
376     pid_t pid, int fd, const void *data, uint16_t datalen)
377 {
378 	int ret;
379 
380 	if ((ret = imsg_compose(&iev->imsgbuf, type, peerid, pid, fd, data,
381 	    datalen)) != -1)
382 		imsg_event_add(iev);
383 
384 	return ret;
385 }
386 
387 int
388 main_send_player(uint16_t type, int fd, const void *data, size_t len)
389 {
390 	return imsg_compose_event(iev_player, type, 0, 0, fd, data, len);
391 }
392 
393 int
394 main_play_song(const char *path)
395 {
396 	struct stat sb;
397 	int fd;
398 
399 	if ((fd = open(path, O_RDONLY)) == -1) {
400 		log_warn("open %s", path);
401 		return 0;
402 	}
403 
404 	if (fstat(fd, &sb) == -1) {
405 		log_warn("failed to stat %s", path);
406 		close(fd);
407 		return 0;
408 	}
409 
410 	if (!S_ISREG(sb.st_mode)) {
411 		log_info("skipping non-regular file: %s", path);
412 		close(fd);
413 		return 0;
414 	}
415 
416 	play_state = STATE_PLAYING;
417 	main_send_player(IMSG_PLAY, fd, NULL, 0);
418 	return 1;
419 }
420 
421 void
422 main_playlist_jump(struct imsgev *iev, struct imsg *imsg)
423 {
424 	char arg[PATH_MAX];
425 	const char *song;
426 
427 	if (imsg_get_data(imsg, arg, sizeof(arg)) == -1) {
428 		main_senderr(iev, "wrong size");
429 		return;
430 	}
431 
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 	char path[PATH_MAX];
518 	const char *err = NULL;
519 
520 	if (imsg_get_data(imsg, path, sizeof(path)) == -1) {
521 		err = "data size mismatch";
522 		goto err;
523 	}
524 
525 	if (path[sizeof(path)-1] != '\0') {
526 		err = "malformed data";
527 		goto err;
528 	}
529 
530 	if (tx)
531 		playlist_push(px, path);
532 	else
533 		playlist_enqueue(path);
534 	imsg_compose_event(iev, IMSG_CTL_ADD, 0, 0, -1, path, sizeof(path));
535 	return;
536 err:
537 	main_senderr(iev, err);
538 }
539 
540 void
541 main_send_playlist(struct imsgev *iev)
542 {
543 	struct player_status s;
544 	size_t i;
545 
546 	for (i = 0; i < playlist.len; ++i) {
547 		memset(&s, 0, sizeof(s));
548 		strlcpy(s.path, playlist.songs[i], sizeof(s.path));
549 		s.status = play_off == i ? STATE_PLAYING : STATE_STOPPED;
550 		imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, &s,
551 		    sizeof(s));
552 	}
553 
554 	imsg_compose_event(iev, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
555 }
556 
557 void
558 main_send_status(struct imsgev *iev)
559 {
560 	struct player_status s;
561 
562 	memset(&s, 0, sizeof(s));
563 
564 	if (current_song != NULL)
565 		strlcpy(s.path, current_song, sizeof(s.path));
566 	s.status = play_state;
567 	s.position = current_position;
568 	s.duration = current_duration;
569 	s.mode.repeat_all = repeat_all;
570 	s.mode.repeat_one = repeat_one;
571 	s.mode.consume = consume;
572 
573 	imsg_compose_event(iev, IMSG_CTL_STATUS, 0, 0, -1, &s, sizeof(s));
574 }
575 
576 void
577 main_seek(struct player_seek *s)
578 {
579 	switch (play_state) {
580 	case STATE_STOPPED:
581 		main_playlist_resume();
582 		break;
583 	case STATE_PLAYING:
584 		break;
585 	case STATE_PAUSED:
586 		play_state = STATE_PLAYING;
587 		break;
588 	}
589 
590 	main_send_player(IMSG_CTL_SEEK, -1, s, sizeof(*s));
591 }