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/socket.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/un.h>
22 
23 #include <errno.h>
24 #include <event.h>
25 #include <limits.h>
26 #include <sndio.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 #include <imsg.h>
34 
35 #include "amused.h"
36 #include "log.h"
37 #include "playlist.h"
38 #include "xmalloc.h"
39 
40 static struct imsgbuf *ibuf;
41 
42 int	ctl_noarg(struct parse_result *, int, char **);
43 int	ctl_add(struct parse_result *, int, char **);
44 int	ctl_show(struct parse_result *, int, char **);
45 int	ctl_load(struct parse_result *, int, char **);
46 int	ctl_jump(struct parse_result *, int, char **);
47 int	ctl_repeat(struct parse_result *, int, char **);
48 
49 struct ctl_command ctl_commands[] = {
50 	{ "play",	PLAY,		ctl_noarg,	"" },
51 	{ "pause",	PAUSE,		ctl_noarg,	"" },
52 	{ "toggle",	TOGGLE,		ctl_noarg,	"" },
53 	{ "stop",	STOP,		ctl_noarg,	"" },
54 	{ "restart",	RESTART,	ctl_noarg,	"" },
55 	{ "add",	ADD,		ctl_add,	"files...", 1 },
56 	{ "flush",	FLUSH,		ctl_noarg,	"" },
57 	{ "show",	SHOW,		ctl_show,	"[-p]" },
58 	{ "status",	STATUS,		ctl_noarg,	"" },
59 	{ "next",	NEXT,		ctl_noarg,	"" },
60 	{ "prev",	PREV,		ctl_noarg,	"" },
61 	{ "load",	LOAD,		ctl_load,	"[file]", 1 },
62 	{ "jump",	JUMP,		ctl_jump,	"pattern" },
63 	{ "repeat",	REPEAT,		ctl_repeat,	"one|all on|off" },
64 	{ "monitor",	MONITOR,	ctl_noarg,	"" },
65 	{ NULL },
66 };
67 
68 __dead void
69 usage(void)
70 {
71 	fprintf(stderr, "usage: %s [-dv] [-s socket]\n", getprogname());
72 	exit(1);
73 }
74 
75 static __dead void
76 ctl_usage(struct ctl_command *ctl)
77 {
78 	fprintf(stderr, "usage: %s [-v] [-s socket] %s %s\n", getprogname(),
79 	    ctl->name, ctl->usage);
80 	exit(1);
81 }
82 
83 static int
84 parse(int argc, char **argv)
85 {
86 	struct ctl_command	*ctl = NULL;
87 	struct parse_result	 res;
88 	int			 i, status;
89 
90 	memset(&res, 0, sizeof(res));
91 
92 	for (i = 0; ctl_commands[i].name != NULL; ++i) {
93 		if (strncmp(ctl_commands[i].name, argv[0], strlen(argv[0]))
94 		    == 0) {
95 			if (ctl != NULL) {
96 				fprintf(stderr,
97 				    "ambiguous argument: %s\n", argv[0]);
98 				usage();
99 			}
100 			ctl = &ctl_commands[i];
101 		}
102 	}
103 
104 	if (ctl == NULL) {
105 		fprintf(stderr, "unknown argument: %s\n", argv[0]);
106 		usage();
107 	}
108 
109 	res.action = ctl->action;
110 	res.ctl = ctl;
111 
112 	if (!ctl->has_pledge) {
113 		/* pledge(2) default if command doesn't have its own */
114 		if (pledge("stdio", NULL) == -1)
115 			fatal("pledge");
116 	}
117 
118 	status = ctl->main(&res, argc, argv);
119 	close(ibuf->fd);
120 	free(ibuf);
121 	return status;
122 }
123 
124 static int
125 enqueue_tracks(char **files)
126 {
127 	char res[PATH_MAX];
128 	int enq = 0;
129 
130 	for (; *files != NULL; ++files) {
131 		memset(&res, 0, sizeof(res));
132 		if (realpath(*files, res) == NULL) {
133 			log_warn("realpath %s", *files);
134 			continue;
135 		}
136 
137 		imsg_compose(ibuf, IMSG_CTL_ADD, 0, 0, -1,
138 		    res, sizeof(res));
139 		enq++;
140 	}
141 
142 	return enq == 0;
143 }
144 
145 static int
146 jump_req(const char *arg)
147 {
148 	char path[PATH_MAX];
149 
150 	memset(path, 0, sizeof(path));
151 	strlcpy(path, arg, sizeof(path));
152 	imsg_compose(ibuf, IMSG_CTL_JUMP, 0, 0, -1, path, sizeof(path));
153 	return 0;
154 }
155 
156 static void
157 print_error_message(const char *prfx, struct imsg *imsg)
158 {
159 	size_t datalen;
160 	char *msg;
161 
162 	datalen = IMSG_DATA_SIZE(*imsg);
163 	if ((msg = calloc(1, datalen)) == NULL)
164 		fatal("calloc %zu", datalen);
165 	memcpy(msg, imsg->data, datalen);
166 	if (datalen == 0 || msg[datalen-1] != '\0')
167 		fatalx("malformed error message");
168 
169 	log_warnx("%s: %s", prfx, msg);
170 	free(msg);
171 }
172 
173 static int
174 show_add(struct imsg *imsg, int *ret, char ***files)
175 {
176 	if (**files == NULL) {
177 		log_warnx("received more replies than file sent");
178 		*ret = 1;
179 		return 1;
180 	}
181 
182 	if (imsg->hdr.type == IMSG_CTL_ERR)
183 		print_error_message(**files, imsg);
184 	else if (imsg->hdr.type == IMSG_CTL_ADD)
185 		log_debug("enqueued %s", **files);
186 	else
187 		fatalx("got invalid message %d", imsg->hdr.type);
188 
189 	(*files)++;
190 	return (**files) == NULL;
191 }
192 
193 static int
194 show_complete(struct parse_result *res, struct imsg *imsg, int *ret)
195 {
196 	struct player_status s;
197 	size_t datalen;
198 
199 	if (imsg->hdr.type == IMSG_CTL_ERR) {
200 		print_error_message("show failed", imsg);
201 		*ret = 1;
202 		return 1;
203 	}
204 
205 	datalen = IMSG_DATA_SIZE(*imsg);
206 	if (datalen == 0)
207 		return 1;
208 
209 	if (datalen != sizeof(s))
210 		fatalx("%s: data size mismatch", __func__);
211 	memcpy(&s, imsg->data, sizeof(s));
212 	if (s.path[sizeof(s.path)-1] != '\0')
213 		fatalx("%s: data corrupted?", __func__);
214 
215 	if (res->pretty)
216 		printf("%c ", s.status == STATE_PLAYING ? '>' : ' ');
217 	printf("%s\n", s.path);
218 	return 0;
219 }
220 
221 static int
222 show_status(struct imsg *imsg, int *ret)
223 {
224 	struct player_status s;
225 	size_t datalen;
226 
227 	if (imsg->hdr.type == IMSG_CTL_ERR) {
228 		print_error_message("show failed", imsg);
229 		*ret = 1;
230 		return 1;
231 	}
232 
233 	if (imsg->hdr.type != IMSG_CTL_STATUS)
234 		fatalx("%s: got wrong reply", __func__);
235 
236 	datalen = IMSG_DATA_SIZE(*imsg);
237 	if (datalen != sizeof(s))
238 		fatalx("%s: data size mismatch", __func__);
239 	memcpy(&s, imsg->data, sizeof(s));
240 	if (s.path[sizeof(s.path)-1] != '\0')
241 		fatalx("%s: data corrupted?", __func__);
242 
243 	switch (s.status) {
244 	case STATE_STOPPED:
245 		printf("stopped ");
246 		break;
247 	case STATE_PLAYING:
248 		printf("playing ");
249 		break;
250 	case STATE_PAUSED:
251 		printf("paused ");
252 		break;
253 	default:
254 		printf("unknown ");
255 		break;
256 	}
257 
258 	printf("%s\n", s.path);
259 	printf("repeat one %s -- repeat all %s\n",
260 	    s.rp.repeat_one ? "on" : "off",
261 	    s.rp.repeat_all ? "on" : "off");
262 	return 1;
263 }
264 
265 static int
266 show_load(struct parse_result *res, struct imsg *imsg, int *ret)
267 {
268 	FILE		*f;
269 	const char	*file;
270 	char		*line = NULL;
271 	char		 path[PATH_MAX];
272 	size_t		 linesize = 0, i = 0;
273 	ssize_t		 linelen, curr = -1;
274 
275 	if (imsg->hdr.type == IMSG_CTL_ERR) {
276 		print_error_message("load failed", imsg);
277 		*ret = 1;
278 		return 1;
279 	}
280 
281 	if (imsg->hdr.type == IMSG_CTL_ADD)
282 		return 0;
283 
284 	if (imsg->hdr.type == IMSG_CTL_COMMIT)
285 		return 1;
286 
287 	if (imsg->hdr.type != IMSG_CTL_BEGIN)
288 		fatalx("got unexpected message %d", imsg->hdr.type);
289 
290 	if (res->file == NULL)
291 		f = stdin;
292 	else if ((f = fopen(res->file, "r")) == NULL) {
293 		log_warn("can't open %s", res->file);
294 		*ret = 1;
295 		return 1;
296 	}
297 
298 	while ((linelen = getline(&line, &linesize, f)) != -1) {
299 		if (linelen == 0)
300 			continue;
301 		line[linelen-1] = '\0';
302 		file = line;
303 		if (file[0] == '>' && file[1] == ' ') {
304 			file += 2;
305 			curr = i;
306 		}
307 		if (file[0] == ' ' && file[1] == ' ')
308 			file += 2;
309 
310 		memset(&path, 0, sizeof(path));
311 		if (realpath(file, path) == NULL) {
312 			log_warn("realpath %s", file);
313 			continue;
314 		}
315 
316 		i++;
317 		imsg_compose(ibuf, IMSG_CTL_ADD, 0, 0, -1,
318 		    path, sizeof(path));
319 	}
320 
321 	free(line);
322 	if (ferror(f))
323 		fatal("getline");
324 	fclose(f);
325 
326 	if (i == 0) {
327 		*ret = 1;
328 		return 1;
329 	}
330 
331 	imsg_compose(ibuf, IMSG_CTL_COMMIT, 0, 0, -1,
332 	    &curr, sizeof(curr));
333 	imsg_flush(ibuf);
334 	return 0;
335 }
336 
337 static int
338 show_monitor(struct imsg *imsg, int *ret)
339 {
340 	int type;
341 
342 	if (imsg->hdr.type != IMSG_CTL_MONITOR) {
343 		log_warnx("wrong message type received: %d",
344 		    imsg->hdr.type);
345 		*ret = 1;
346 		return 1;
347 	}
348 
349 	if (IMSG_DATA_SIZE(*imsg) != sizeof(type)) {
350 		log_warnx("size mismatch");
351 		*ret = 1;
352 		return 1;
353 	}
354 
355 	memcpy(&type, imsg->data, sizeof(type));
356 	switch (type) {
357 	case IMSG_CTL_PLAY:
358 		puts("play");
359 		break;
360 	case IMSG_CTL_TOGGLE_PLAY:
361 		puts("toggle");
362 		break;
363 	case IMSG_CTL_PAUSE:
364 		puts("pause");
365 		break;
366 	case IMSG_CTL_STOP:
367 		puts("stop");
368 		break;
369 	case IMSG_CTL_RESTART:
370 		puts("restart");
371 		break;
372 	case IMSG_CTL_FLUSH:
373 		puts("flush");
374 		break;
375 	case IMSG_CTL_NEXT:
376 		puts("next");
377 		break;
378 	case IMSG_CTL_PREV:
379 		puts("prev");
380 		break;
381 	case IMSG_CTL_JUMP:
382 		puts("jump");
383 		break;
384 	case IMSG_CTL_REPEAT:
385 		puts("repeat");
386 		break;
387 	case IMSG_CTL_ADD:
388 		puts("add");
389 		break;
390 	case IMSG_CTL_COMMIT:
391 		puts("load");
392 		break;
393 	default:
394 		puts("unknown");
395 		break;
396 	}
397 
398 	fflush(stdout);
399 	return 0;
400 }
401 
402 static int
403 ctlaction(struct parse_result *res)
404 {
405 	struct imsg imsg;
406 	ssize_t n;
407 	int ret = 0, done = 1;
408 	char **files;
409 
410 	switch (res->action) {
411 	case PLAY:
412 		imsg_compose(ibuf, IMSG_CTL_PLAY, 0, 0, -1, NULL, 0);
413 		if (verbose) {
414 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
415 			    NULL, 0);
416 			done = 0;
417 		}
418 		break;
419 	case PAUSE:
420 		imsg_compose(ibuf, IMSG_CTL_PAUSE, 0, 0, -1, NULL, 0);
421 		break;
422 	case TOGGLE:
423 		imsg_compose(ibuf, IMSG_CTL_TOGGLE_PLAY, 0, 0, -1, NULL, 0);
424 		if (verbose) {
425 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
426 			    NULL, 0);
427 			done = 0;
428 		}
429 		break;
430 	case STOP:
431 		imsg_compose(ibuf, IMSG_CTL_STOP, 0, 0, -1, NULL, 0);
432 		break;
433 	case RESTART:
434 		imsg_compose(ibuf, IMSG_CTL_RESTART, 0, 0, -1, NULL, 0);
435 		if (verbose) {
436 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
437 			    NULL, 0);
438 			done = 0;
439 		}
440 		break;
441 	case ADD:
442 		done = 0;
443 		files = res->files;
444 		ret = enqueue_tracks(res->files);
445 		break;
446 	case FLUSH:
447 		imsg_compose(ibuf, IMSG_CTL_FLUSH, 0, 0, -1, NULL, 0);
448 		break;
449 	case SHOW:
450 		done = 0;
451 		imsg_compose(ibuf, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
452 		break;
453 	case STATUS:
454 		done = 0;
455 		imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1, NULL, 0);
456 		break;
457 	case NEXT:
458 		imsg_compose(ibuf, IMSG_CTL_NEXT, 0, 0, -1, NULL, 0);
459 		if (verbose) {
460 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
461 			    NULL, 0);
462 			done = 0;
463 		}
464 		break;
465 	case PREV:
466 		imsg_compose(ibuf, IMSG_CTL_PREV, 0, 0, -1, NULL, 0);
467 		if (verbose) {
468 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
469 			    NULL, 0);
470 			done = 0;
471 		}
472 		break;
473 	case LOAD:
474 		done = 0;
475 		imsg_compose(ibuf, IMSG_CTL_BEGIN, 0, 0, -1, NULL, 0);
476 		break;
477 	case JUMP:
478 		done = 0;
479 		ret = jump_req(res->file);
480 		break;
481 	case REPEAT:
482 		imsg_compose(ibuf, IMSG_CTL_REPEAT, 0, 0, -1,
483 		    &res->rep, sizeof(res->rep));
484 		break;
485 	case MONITOR:
486 		done = 0;
487 		imsg_compose(ibuf, IMSG_CTL_MONITOR, 0, 0, -1,
488 		    NULL, 0);
489 		break;
490 	case NONE:
491 		/* action not expected */
492 		fatalx("invalid action %u", res->action);
493 		break;
494 	}
495 
496 	if (ret != 0)
497 		goto end;
498 
499 	imsg_flush(ibuf);
500 
501 	while (!done) {
502 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
503 			fatalx("imsg_read error");
504 		if (n == 0)
505 			fatalx("pipe closed");
506 
507 		while (!done) {
508 			if ((n = imsg_get(ibuf, &imsg)) == -1)
509 				fatalx("imsg_get error");
510 			if (n == 0)
511 				break;
512 
513 			switch (res->action) {
514 			case ADD:
515 				done = show_add(&imsg, &ret, &files);
516 				break;
517 			case SHOW:
518 				done = show_complete(res, &imsg, &ret);
519 				break;
520 			case PLAY:
521 			case TOGGLE:
522 			case RESTART:
523 			case STATUS:
524 			case NEXT:
525 			case PREV:
526 			case JUMP:
527 				done = show_status(&imsg, &ret);
528 				break;
529 			case LOAD:
530 				done = show_load(res, &imsg, &ret);
531 				break;
532 			case MONITOR:
533 				done = show_monitor(&imsg, &ret);
534 				break;
535 			default:
536 				done = 1;
537 				break;
538 			}
539 
540 			imsg_free(&imsg);
541 		}
542 	}
543 
544 end:
545 	return ret;
546 }
547 
548 int
549 ctl_noarg(struct parse_result *res, int argc, char **argv)
550 {
551 	if (argc != 1)
552 		ctl_usage(res->ctl);
553 	return ctlaction(res);
554 }
555 
556 int
557 ctl_add(struct parse_result *res, int argc, char **argv)
558 {
559 	if (argc < 2)
560 		ctl_usage(res->ctl);
561 	res->files = argv+1;
562 
563 	if (pledge("stdio rpath", NULL) == -1)
564 		fatal("pledge");
565 
566 	return ctlaction(res);
567 }
568 
569 int
570 ctl_show(struct parse_result *res, int argc, char **argv)
571 {
572 	int ch;
573 
574 	while ((ch = getopt(argc, argv, "p")) != -1) {
575 		switch (ch) {
576 		case 'p':
577 			res->pretty = 1;
578 			break;
579 		default:
580 			ctl_usage(res->ctl);
581 		}
582 	}
583 
584 	return ctlaction(res);
585 }
586 
587 int
588 ctl_load(struct parse_result *res, int argc, char **argv)
589 {
590 	if (argc < 2)
591 		res->file = NULL;
592 	else if (argc == 2)
593 		res->file = argv[1];
594 	else
595 		ctl_usage(res->ctl);
596 
597 	if (pledge("stdio rpath", NULL) == -1)
598 		fatal("pledge");
599 
600 	return ctlaction(res);
601 }
602 
603 int
604 ctl_jump(struct parse_result *res, int argc, char **argv)
605 {
606 	int ch;
607 
608 	while ((ch = getopt(argc, argv, "")) != -1)
609 		ctl_usage(res->ctl);
610 	argc -= optind;
611 	argv += optind;
612 
613 	if (argc != 1)
614 		ctl_usage(res->ctl);
615 
616 	res->file = argv[0];
617 	return ctlaction(res);
618 }
619 
620 int
621 ctl_repeat(struct parse_result *res, int argc, char **argv)
622 {
623 	int ch, b;
624 
625 	while ((ch = getopt(argc, argv, "")) != -1)
626 		ctl_usage(res->ctl);
627 	argc -= optind;
628 	argv += optind;
629 
630 	if (argc != 2)
631 		ctl_usage(res->ctl);
632 
633 	if (!strcmp(argv[1], "on"))
634 		b = 1;
635 	else if (!strcmp(argv[1], "off"))
636 		b = 0;
637 	else
638 		ctl_usage(res->ctl);
639 
640 	res->rep.repeat_one = -1;
641 	res->rep.repeat_all = -1;
642 	if (!strcmp(argv[0], "one"))
643 		res->rep.repeat_one = b;
644 	else if (!strcmp(argv[0], "all"))
645 		res->rep.repeat_all = b;
646 	else
647 		ctl_usage(res->ctl);
648 
649 	return ctlaction(res);
650 }
651 
652 static int
653 sockconn(void)
654 {
655 	struct sockaddr_un	sun;
656 	int			sock, saved_errno;
657 
658 	if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
659 		fatal("socket");
660 
661 	memset(&sun, 0, sizeof(sun));
662 	sun.sun_family = AF_UNIX;
663 	strlcpy(sun.sun_path, csock, sizeof(sun.sun_path));
664 	if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
665 		saved_errno = errno;
666 		close(sock);
667 		errno = saved_errno;
668 		return -1;
669 	}
670 
671 	return sock;
672 }
673 
674 __dead void
675 ctl(int argc, char **argv)
676 {
677 	int ctl_sock, i = 0;
678 
679 	log_init(1, LOG_DAEMON);
680 	log_setverbose(verbose);
681 
682 	do {
683 		struct timespec	ts = { 0, 50000000 }; /* 0.05 seconds */
684 
685 		if ((ctl_sock = sockconn()) != -1)
686 			break;
687 		if (errno != ENOENT && errno != ECONNREFUSED)
688 			fatal("connect %s", csock);
689 
690 		if (i == 0)
691 			spawn_daemon();
692 
693 		nanosleep(&ts, NULL);
694 	} while (++i < 20);
695 
696 	if (ctl_sock == -1)
697 		fatalx("failed to connect to the daemon");
698 
699 	ibuf = xmalloc(sizeof(*ibuf));
700 	imsg_init(ibuf, ctl_sock);
701 
702 	optreset = 1;
703 	optind = 1;
704 
705 	exit(parse(argc, argv));
706 }