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Date:: Mon Feb 21 21:11:23 2022 UTC
Message:: add the `monitor' command
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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/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;
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 show_monitor(struct imsg *imsg, int *ret)
338 {
339 	int type;
340 
341 	if (imsg->hdr.type != IMSG_CTL_MONITOR) {
342 		log_warnx("wrong message type received: %d",
343 		    imsg->hdr.type);
344 		*ret = 1;
345 		return 1;
346 	}
347 
348 	if (IMSG_DATA_SIZE(*imsg) != sizeof(type)) {
349 		log_warnx("size mismatch");
350 		*ret = 1;
351 		return 1;
352 	}
353 
354 	memcpy(&type, imsg->data, sizeof(type));
355 	switch (type) {
356 	case IMSG_CTL_PLAY:
357 		puts("play");
358 		break;
359 	case IMSG_CTL_TOGGLE_PLAY:
360 		puts("toggle");
361 		break;
362 	case IMSG_CTL_PAUSE:
363 		puts("pause");
364 		break;
365 	case IMSG_CTL_STOP:
366 		puts("stop");
367 		break;
368 	case IMSG_CTL_RESTART:
369 		puts("restart");
370 		break;
371 	case IMSG_CTL_FLUSH:
372 		puts("flush");
373 		break;
374 	case IMSG_CTL_NEXT:
375 		puts("next");
376 		break;
377 	case IMSG_CTL_PREV:
378 		puts("prev");
379 		break;
380 	case IMSG_CTL_JUMP:
381 		puts("jump");
382 		break;
383 	case IMSG_CTL_REPEAT:
384 		puts("repeat");
385 		break;
386 	case IMSG_CTL_ADD:
387 		puts("add");
388 		break;
389 	case IMSG_CTL_COMMIT:
390 		puts("load");
391 		break;
392 	default:
393 		puts("unknown");
394 		break;
395 	}
396 
397 	return 0;
398 }
399 
400 static int
401 ctlaction(struct parse_result *res)
402 {
403 	struct imsg imsg;
404 	ssize_t n;
405 	int ret = 0, done = 1;
406 	char **files;
407 
408 	switch (res->action) {
409 	case PLAY:
410 		imsg_compose(ibuf, IMSG_CTL_PLAY, 0, 0, -1, NULL, 0);
411 		if (verbose) {
412 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
413 			    NULL, 0);
414 			done = 0;
415 		}
416 		break;
417 	case PAUSE:
418 		imsg_compose(ibuf, IMSG_CTL_PAUSE, 0, 0, -1, NULL, 0);
419 		break;
420 	case TOGGLE:
421 		imsg_compose(ibuf, IMSG_CTL_TOGGLE_PLAY, 0, 0, -1, NULL, 0);
422 		if (verbose) {
423 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
424 			    NULL, 0);
425 			done = 0;
426 		}
427 		break;
428 	case STOP:
429 		imsg_compose(ibuf, IMSG_CTL_STOP, 0, 0, -1, NULL, 0);
430 		break;
431 	case RESTART:
432 		imsg_compose(ibuf, IMSG_CTL_RESTART, 0, 0, -1, NULL, 0);
433 		if (verbose) {
434 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
435 			    NULL, 0);
436 			done = 0;
437 		}
438 		break;
439 	case ADD:
440 		done = 0;
441 		files = res->files;
442 		ret = enqueue_tracks(res->files);
443 		break;
444 	case FLUSH:
445 		imsg_compose(ibuf, IMSG_CTL_FLUSH, 0, 0, -1, NULL, 0);
446 		break;
447 	case SHOW:
448 		done = 0;
449 		imsg_compose(ibuf, IMSG_CTL_SHOW, 0, 0, -1, NULL, 0);
450 		break;
451 	case STATUS:
452 		done = 0;
453 		imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1, NULL, 0);
454 		break;
455 	case NEXT:
456 		imsg_compose(ibuf, IMSG_CTL_NEXT, 0, 0, -1, NULL, 0);
457 		if (verbose) {
458 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
459 			    NULL, 0);
460 			done = 0;
461 		}
462 		break;
463 	case PREV:
464 		imsg_compose(ibuf, IMSG_CTL_PREV, 0, 0, -1, NULL, 0);
465 		if (verbose) {
466 			imsg_compose(ibuf, IMSG_CTL_STATUS, 0, 0, -1,
467 			    NULL, 0);
468 			done = 0;
469 		}
470 		break;
471 	case LOAD:
472 		done = 0;
473 		imsg_compose(ibuf, IMSG_CTL_BEGIN, 0, 0, -1, NULL, 0);
474 		break;
475 	case JUMP:
476 		done = 0;
477 		ret = jump_req(res->file);
478 		break;
479 	case REPEAT:
480 		imsg_compose(ibuf, IMSG_CTL_REPEAT, 0, 0, -1,
481 		    &res->rep, sizeof(res->rep));
482 		break;
483 	case MONITOR:
484 		done = 0;
485 		imsg_compose(ibuf, IMSG_CTL_MONITOR, 0, 0, -1,
486 		    NULL, 0);
487 		break;
488 	case NONE:
489 		/* action not expected */
490 		fatalx("invalid action %u", res->action);
491 		break;
492 	}
493 
494 	if (ret != 0)
495 		goto end;
496 
497 	imsg_flush(ibuf);
498 
499 	while (!done) {
500 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
501 			fatalx("imsg_read error");
502 		if (n == 0)
503 			fatalx("pipe closed");
504 
505 		while (!done) {
506 			if ((n = imsg_get(ibuf, &imsg)) == -1)
507 				fatalx("imsg_get error");
508 			if (n == 0)
509 				break;
510 
511 			switch (res->action) {
512 			case ADD:
513 				done = show_add(&imsg, &ret, &files);
514 				break;
515 			case SHOW:
516 				done = show_complete(res, &imsg, &ret);
517 				break;
518 			case PLAY:
519 			case TOGGLE:
520 			case RESTART:
521 			case STATUS:
522 			case NEXT:
523 			case PREV:
524 			case JUMP:
525 				done = show_status(&imsg, &ret);
526 				break;
527 			case LOAD:
528 				done = show_load(res, &imsg, &ret);
529 				break;
530 			case MONITOR:
531 				done = show_monitor(&imsg, &ret);
532 				break;
533 			default:
534 				done = 1;
535 				break;
536 			}
537 
538 			imsg_free(&imsg);
539 		}
540 	}
541 
542 end:
543 	return ret;
544 }
545 
546 int
547 ctl_noarg(struct parse_result *res, int argc, char **argv)
548 {
549 	if (argc != 1)
550 		ctl_usage(res->ctl);
551 	return ctlaction(res);
552 }
553 
554 int
555 ctl_add(struct parse_result *res, int argc, char **argv)
556 {
557 	if (argc < 2)
558 		ctl_usage(res->ctl);
559 	res->files = argv+1;
560 
561 	if (pledge("stdio rpath", NULL) == -1)
562 		fatal("pledge");
563 
564 	return ctlaction(res);
565 }
566 
567 int
568 ctl_show(struct parse_result *res, int argc, char **argv)
569 {
570 	int ch;
571 
572 	while ((ch = getopt(argc, argv, "p")) != -1) {
573 		switch (ch) {
574 		case 'p':
575 			res->pretty = 1;
576 			break;
577 		default:
578 			ctl_usage(res->ctl);
579 		}
580 	}
581 
582 	return ctlaction(res);
583 }
584 
585 int
586 ctl_load(struct parse_result *res, int argc, char **argv)
587 {
588 	if (argc < 2)
589 		res->file = NULL;
590 	else if (argc == 2)
591 		res->file = argv[1];
592 	else
593 		ctl_usage(res->ctl);
594 
595 	if (pledge("stdio rpath", NULL) == -1)
596 		fatal("pledge");
597 
598 	return ctlaction(res);
599 }
600 
601 int
602 ctl_jump(struct parse_result *res, int argc, char **argv)
603 {
604 	int ch;
605 
606 	while ((ch = getopt(argc, argv, "")) != -1)
607 		ctl_usage(res->ctl);
608 	argc -= optind;
609 	argv += optind;
610 
611 	if (argc != 1)
612 		ctl_usage(res->ctl);
613 
614 	res->file = argv[0];
615 	return ctlaction(res);
616 }
617 
618 int
619 ctl_repeat(struct parse_result *res, int argc, char **argv)
620 {
621 	int ch, b;
622 
623 	while ((ch = getopt(argc, argv, "")) != -1)
624 		ctl_usage(res->ctl);
625 	argc -= optind;
626 	argv += optind;
627 
628 	if (argc != 2)
629 		ctl_usage(res->ctl);
630 
631 	if (!strcmp(argv[1], "on"))
632 		b = 1;
633 	else if (!strcmp(argv[1], "off"))
634 		b = 0;
635 	else
636 		ctl_usage(res->ctl);
637 
638 	res->rep.repeat_one = -1;
639 	res->rep.repeat_all = -1;
640 	if (!strcmp(argv[0], "one"))
641 		res->rep.repeat_one = b;
642 	else if (!strcmp(argv[0], "all"))
643 		res->rep.repeat_all = b;
644 	else
645 		ctl_usage(res->ctl);
646 
647 	return ctlaction(res);
648 }
649 
650 static int
651 sockconn(void)
652 {
653 	struct sockaddr_un	sun;
654 	int			sock, saved_errno;
655 
656 	if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
657 		fatal("socket");
658 
659 	memset(&sun, 0, sizeof(sun));
660 	sun.sun_family = AF_UNIX;
661 	strlcpy(sun.sun_path, csock, sizeof(sun.sun_path));
662 	if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
663 		saved_errno = errno;
664 		close(sock);
665 		errno = saved_errno;
666 		return -1;
667 	}
668 
669 	return sock;
670 }
671 
672 __dead void
673 ctl(int argc, char **argv)
674 {
675 	int ctl_sock, i = 0;
676 
677 	log_init(1, LOG_DAEMON);
678 	log_setverbose(verbose);
679 
680 	do {
681 		struct timespec	ts = { 0, 50000000 }; /* 0.05 seconds */
682 
683 		if ((ctl_sock = sockconn()) != -1)
684 			break;
685 		if (errno != ENOENT && errno != ECONNREFUSED)
686 			fatal("connect %s", csock);
687 
688 		if (i == 0)
689 			spawn_daemon();
690 
691 		nanosleep(&ts, NULL);
692 	} while (++i < 20);
693 
694 	if (ctl_sock == -1)
695 		fatalx("failed to connect to the daemon");
696 
697 	ibuf = xmalloc(sizeof(*ibuf));
698 	imsg_init(ibuf, ctl_sock);
699 
700 	optreset = 1;
701 	optind = 1;
702 
703 	exit(parse(argc, argv));
704 }