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 	{ NULL },
65 };
66 
67 __dead void
68 usage(void)
69 {
70 	fprintf(stderr, "usage: %s [-dv] [-s socket]\n", getprogname());
71 	fprintf(stderr, "%s version %s\n", getprogname(), AMUSED_VERSION);
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;
273 	ssize_t		 linelen;
274 	int		 any = 0;
275 
276 	if (imsg->hdr.type == IMSG_CTL_ERR) {
277 		print_error_message("load failed", imsg);
278 		*ret = 1;
279 		return 1;
280 	}
281 
282 	if (imsg->hdr.type == IMSG_CTL_ADD)
283 		return 0;
284 
285 	if (imsg->hdr.type == IMSG_CTL_COMMIT)
286 		return 1;
287 
288 	if (imsg->hdr.type != IMSG_CTL_BEGIN)
289 		fatalx("got unexpected message %d", imsg->hdr.type);
290 
291 	if (res->file == NULL)
292 		f = stdin;
293 	else if ((f = fopen(res->file, "r")) == NULL) {
294 		log_warn("can't open %s", res->file);
295 		*ret = 1;
296 		return 1;
297 	}
298 
299 	while ((linelen = getline(&line, &linesize, f)) != -1) {
300 		if (linelen == 0)
301 			continue;
302 		line[linelen-1] = '\0';
303 		file = line;
304 		if (file[0] == '>' && file[1] == ' ')
305 			file += 2;
306 		if (file[0] == ' ' && file[1] == ' ')
307 			file += 2;
308 
309 		memset(&path, 0, sizeof(path));
310 		if (realpath(file, path) == NULL) {
311 			log_warn("realpath %s", file);
312 			continue;
313 		}
314 
315 		any++;
316 		imsg_compose(ibuf, IMSG_CTL_ADD, 0, 0, -1,
317 		    path, sizeof(path));
318 	}
319 
320 	free(line);
321 	if (ferror(f))
322 		fatal("getline");
323 	fclose(f);
324 
325 	if (!any) {
326 		*ret = 1;
327 		return 1;
328 	}
329 
330 	imsg_compose(ibuf, IMSG_CTL_COMMIT, 0, 0, -1,
331 	    NULL, 0);
332 	imsg_flush(ibuf);
333 	return 0;
334 }
335 
336 static int
337 ctlaction(struct parse_result *res)
338 {
339 	struct imsg imsg;
340 	ssize_t n;
341 	int ret = 0, done = 1;
342 	char **files;
343 
344 	switch (res->action) {
345 	case PLAY:
346 		imsg_compose(ibuf, IMSG_CTL_PLAY, 0, 0, -1, NULL, 0);
347 		if (verbose) {
348 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
349 			    NULL, 0);
350 			done = 0;
351 		}
352 		break;
353 	case PAUSE:
354 		imsg_compose(ibuf, IMSG_CTL_PAUSE, 0, 0, -1, NULL, 0);
355 		break;
356 	case TOGGLE:
357 		imsg_compose(ibuf, IMSG_CTL_TOGGLE_PLAY, 0, 0, -1, NULL, 0);
358 		if (verbose) {
359 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
360 			    NULL, 0);
361 			done = 0;
362 		}
363 		break;
364 	case STOP:
365 		imsg_compose(ibuf, IMSG_CTL_STOP, 0, 0, -1, NULL, 0);
366 		break;
367 	case RESTART:
368 		imsg_compose(ibuf, IMSG_CTL_RESTART, 0, 0, -1, NULL, 0);
369 		if (verbose) {
370 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
371 			    NULL, 0);
372 			done = 0;
373 		}
374 		break;
375 	case ADD:
376 		done = 0;
377 		files = res->files;
378 		ret = enqueue_tracks(res->files);
379 		break;
380 	case FLUSH:
381 		imsg_compose(ibuf, IMSG_CTL_FLUSH, 0, 0, -1, NULL, 0);
382 		break;
383 	case SHOW:
384 		done = 0;
385 		imsg_compose(ibuf, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
386 		break;
387 	case STATUS:
388 		done = 0;
389 		imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1, NULL, 0);
390 		break;
391 	case NEXT:
392 		imsg_compose(ibuf, IMSG_CTL_NEXT, 0, 0, -1, NULL, 0);
393 		if (verbose) {
394 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
395 			    NULL, 0);
396 			done = 0;
397 		}
398 		break;
399 	case PREV:
400 		imsg_compose(ibuf, IMSG_CTL_PREV, 0, 0, -1, NULL, 0);
401 		if (verbose) {
402 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
403 			    NULL, 0);
404 			done = 0;
405 		}
406 		break;
407 	case LOAD:
408 		done = 0;
409 		imsg_compose(ibuf, IMSG_CTL_BEGIN, 0, 0, -1, NULL, 0);
410 		break;
411 	case JUMP:
412 		done = 0;
413 		ret = jump_req(res->file);
414 		break;
415 	case REPEAT:
416 		imsg_compose(ibuf, IMSG_CTL_REPEAT, 0, 0, -1,
417 		    &res->rep, sizeof(res->rep));
418 		break;
419 	case NONE:
420 		/* action not expected */
421 		fatalx("invalid action %u", res->action);
422 		break;
423 	}
424 
425 	if (ret != 0)
426 		goto end;
427 
428 	imsg_flush(ibuf);
429 
430 	while (!done) {
431 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
432 			fatalx("imsg_read error");
433 		if (n == 0)
434 			fatalx("pipe closed");
435 
436 		while (!done) {
437 			if ((n = imsg_get(ibuf, &imsg)) == -1)
438 				fatalx("imsg_get error");
439 			if (n == 0)
440 				break;
441 
442 			switch (res->action) {
443 			case ADD:
444 				done = show_add(&imsg, &ret, &files);
445 				break;
446 			case SHOW:
447 				done = show_complete(res, &imsg, &ret);
448 				break;
449 			case PLAY:
450 			case TOGGLE:
451 			case RESTART:
452 			case STATUS:
453 			case NEXT:
454 			case PREV:
455 			case JUMP:
456 				done = show_status(&imsg, &ret);
457 				break;
458 			case LOAD:
459 				done = show_load(res, &imsg, &ret);
460 				break;
461 			default:
462 				done = 1;
463 				break;
464 			}
465 
466 			imsg_free(&imsg);
467 		}
468 	}
469 
470 end:
471 	return ret;
472 }
473 
474 int
475 ctl_noarg(struct parse_result *res, int argc, char **argv)
476 {
477 	if (argc != 1)
478 		ctl_usage(res->ctl);
479 	return ctlaction(res);
480 }
481 
482 int
483 ctl_add(struct parse_result *res, int argc, char **argv)
484 {
485 	if (argc < 2)
486 		ctl_usage(res->ctl);
487 	res->files = argv+1;
488 
489 	if (pledge("stdio rpath", NULL) == -1)
490 		fatal("pledge");
491 
492 	return ctlaction(res);
493 }
494 
495 int
496 ctl_show(struct parse_result *res, int argc, char **argv)
497 {
498 	int ch;
499 
500 	while ((ch = getopt(argc, argv, "p")) != -1) {
501 		switch (ch) {
502 		case 'p':
503 			res->pretty = 1;
504 			break;
505 		default:
506 			ctl_usage(res->ctl);
507 		}
508 	}
509 
510 	return ctlaction(res);
511 }
512 
513 int
514 ctl_load(struct parse_result *res, int argc, char **argv)
515 {
516 	if (argc < 2)
517 		res->file = NULL;
518 	else if (argc == 2)
519 		res->file = argv[1];
520 	else
521 		ctl_usage(res->ctl);
522 
523 	if (pledge("stdio rpath", NULL) == -1)
524 		fatal("pledge");
525 
526 	return ctlaction(res);
527 }
528 
529 int
530 ctl_jump(struct parse_result *res, int argc, char **argv)
531 {
532 	int ch;
533 
534 	while ((ch = getopt(argc, argv, "")) != -1)
535 		ctl_usage(res->ctl);
536 	argc -= optind;
537 	argv += optind;
538 
539 	if (argc != 1)
540 		ctl_usage(res->ctl);
541 
542 	res->file = argv[0];
543 	return ctlaction(res);
544 }
545 
546 int
547 ctl_repeat(struct parse_result *res, int argc, char **argv)
548 {
549 	int ch, b;
550 
551 	while ((ch = getopt(argc, argv, "")) != -1)
552 		ctl_usage(res->ctl);
553 	argc -= optind;
554 	argv += optind;
555 
556 	if (argc != 2)
557 		ctl_usage(res->ctl);
558 
559 	if (!strcmp(argv[1], "on"))
560 		b = 1;
561 	else if (!strcmp(argv[1], "off"))
562 		b = 0;
563 	else
564 		ctl_usage(res->ctl);
565 
566 	res->rep.repeat_one = -1;
567 	res->rep.repeat_all = -1;
568 	if (!strcmp(argv[0], "one"))
569 		res->rep.repeat_one = b;
570 	else if (!strcmp(argv[0], "all"))
571 		res->rep.repeat_all = b;
572 	else
573 		ctl_usage(res->ctl);
574 
575 	return ctlaction(res);
576 }
577 
578 static int
579 sockconn(void)
580 {
581 	struct sockaddr_un	sun;
582 	int			sock, saved_errno;
583 
584 	if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
585 		fatal("socket");
586 
587 	memset(&sun, 0, sizeof(sun));
588 	sun.sun_family = AF_UNIX;
589 	strlcpy(sun.sun_path, csock, sizeof(sun.sun_path));
590 	if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
591 		saved_errno = errno;
592 		close(sock);
593 		errno = saved_errno;
594 		return -1;
595 	}
596 
597 	return sock;
598 }
599 
600 __dead void
601 ctl(int argc, char **argv)
602 {
603 	int ctl_sock, i = 0;
604 
605 	log_init(1, LOG_DAEMON);
606 	log_setverbose(verbose);
607 
608 	do {
609 		struct timespec	ts = { 0, 50000000 }; /* 0.05 seconds */
610 
611 		if ((ctl_sock = sockconn()) != -1)
612 			break;
613 		if (errno != ENOENT && errno != ECONNREFUSED)
614 			fatal("connect %s", csock);
615 
616 		if (i == 0)
617 			spawn_daemon();
618 
619 		nanosleep(&ts, NULL);
620 	} while (++i < 20);
621 
622 	if (ctl_sock == -1)
623 		fatalx("failed to connect to the daemon");
624 
625 	ibuf = xmalloc(sizeof(*ibuf));
626 	imsg_init(ibuf, ctl_sock);
627 
628 	optreset = 1;
629 	optind = 1;
630 
631 	exit(parse(argc, argv));
632 }