summaryrefslogtreecommitdiffstats
path: root/misc-utils/uuidd.c
blob: dfcd1487bf26f2b021b0111c52294e11388d2387 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
/*
 * uuidd.c --- UUID-generation daemon
 *
 * Copyright (C) 2007  Theodore Ts'o
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

/*
 * The uuidd protocol.
 *
 * Client:
 * | operation type (1 byte) | number of uuids (if bulk request, 4 bytes) |
 *
 * Server:
 * | reply length (4 bytes) | uuid reply (16 bytes) |
 *   or
 * | reply length (4 bytes) | uuid reply (16 bytes) multiply by number when random bulk request |
 *   or
 * | reply length (4 bytes) | uuid reply (16 bytes) | number (4 bytes) time bulk |
 *   or
 * | reply length (4 bytes) | pid or maxop number string length in ascii (up to 7 bytes) |
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <errno.h>
#include <err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include <getopt.h>
#include <sys/signalfd.h>
#include <poll.h>

#include "uuid.h"
#include "uuidd.h"
#include "all-io.h"
#include "c.h"
#include "closestream.h"
#include "strutils.h"
#include "optutils.h"
#include "monotonic.h"
#include "timer.h"

#ifdef HAVE_LIBSYSTEMD
# include <systemd/sd-daemon.h>
#endif

#include "nls.h"

/* Protocol segment lengths */
typedef uint8_t	uuidd_prot_op_t;	/* client operation field */
typedef int32_t	uuidd_prot_num_t;	/* number of requested uuids */

enum {
	/* client - server buffer size */
	UUIDD_PROT_BUFSZ = ((sizeof(uuidd_prot_num_t)) + (sizeof(uuid_t) * 63))
};

/* server loop control structure */
struct uuidd_cxt_t {
	const char	*cleanup_pidfile;
	const char	*cleanup_socket;
	uint32_t	timeout;
	unsigned int	debug: 1,
			quiet: 1,
			no_fork: 1,
			no_sock: 1;
};

struct uuidd_options_t {
	const char	 *pidfile_path;
	const char	 *socket_path;
	uuidd_prot_num_t num;
	uuidd_prot_op_t	 do_type;
	unsigned int	 do_kill:1,
			 no_pid:1,
			 s_flag:1;
};

static void __attribute__((__noreturn__)) usage(void)
{
	FILE *out = stdout;
	fputs(USAGE_HEADER, out);
	fprintf(out, _(" %s [options]\n"), program_invocation_short_name);
	fputs(USAGE_SEPARATOR, out);
	fputs(_("A daemon for generating UUIDs.\n"), out);
	fputs(USAGE_OPTIONS, out);
	fputs(_(" -p, --pid <path>        path to pid file\n"), out);
	fputs(_(" -s, --socket <path>     path to socket\n"), out);
	fputs(_(" -T, --timeout <sec>     specify inactivity timeout\n"), out);
	fputs(_(" -k, --kill              kill running daemon\n"), out);
	fputs(_(" -r, --random            test random-based generation\n"), out);
	fputs(_(" -t, --time              test time-based generation\n"), out);
	fputs(_(" -n, --uuids <num>       request number of uuids\n"), out);
	fputs(_(" -P, --no-pid            do not create pid file\n"), out);
	fputs(_(" -F, --no-fork           do not daemonize using double-fork\n"), out);
	fputs(_(" -S, --socket-activation do not create listening socket\n"), out);
	fputs(_(" -d, --debug             run in debugging mode\n"), out);
	fputs(_(" -q, --quiet             turn on quiet mode\n"), out);
	fputs(USAGE_SEPARATOR, out);
	printf(USAGE_HELP_OPTIONS(25));
	printf(USAGE_MAN_TAIL("uuidd(8)"));
	exit(EXIT_SUCCESS);
}

static void create_daemon(void)
{
	uid_t euid;

	if (daemon(0, 0))
		err(EXIT_FAILURE, "daemon");

	euid = geteuid();
	if (setreuid(euid, euid) < 0)
		err(EXIT_FAILURE, "setreuid");
}

static int call_daemon(const char *socket_path, uuidd_prot_op_t op, char *buf,
		       size_t buflen, uuidd_prot_num_t *num, const char **err_context)
{
	char op_buf[sizeof(op) + sizeof(*num)];
	size_t op_len;
	int s;
	ssize_t ret;
	int32_t reply_len = 0;
	struct sockaddr_un srv_addr;

	if (((op == UUIDD_OP_BULK_TIME_UUID) ||
	     (op == UUIDD_OP_BULK_RANDOM_UUID)) && !num) {
		if (err_context)
			*err_context = _("bad arguments");
		errno = EINVAL;
		return -1;
	}

	if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
		if (err_context)
			*err_context = _("socket");
		return -1;
	}

	srv_addr.sun_family = AF_UNIX;
	assert(strlen(socket_path) < sizeof(srv_addr.sun_path));
	xstrncpy(srv_addr.sun_path, socket_path, sizeof(srv_addr.sun_path));

	if (connect(s, (const struct sockaddr *) &srv_addr,
		    sizeof(struct sockaddr_un)) < 0) {
		if (err_context)
			*err_context = _("connect");
		close(s);
		return -1;
	}

	if (op == UUIDD_OP_BULK_RANDOM_UUID) {
		if ((buflen - sizeof(*num)) < (size_t)((*num) * sizeof(uuid_t)))
			*num = (buflen - sizeof(*num)) / sizeof(uuid_t);
	}
	op_buf[0] = op;
	op_len = sizeof(op);
	if ((op == UUIDD_OP_BULK_TIME_UUID) ||
	    (op == UUIDD_OP_BULK_RANDOM_UUID)) {
		memcpy(op_buf + sizeof(op), num, sizeof(*num));
		op_len += sizeof(*num);
	}

	ret = write_all(s, op_buf, op_len);
	if (ret < 0) {
		if (err_context)
			*err_context = _("write");
		close(s);
		return -1;
	}

	ret = read_all(s, (char *) &reply_len, sizeof(reply_len));
	if (ret < 0) {
		if (err_context)
			*err_context = _("read count");
		close(s);
		return -1;
	}
	if (reply_len < 0 || (size_t) reply_len > buflen) {
		if (err_context)
			*err_context = _("bad response length");
		close(s);
		return -1;
	}
	ret = read_all(s, (char *) buf, reply_len);

	if ((ret > 0) && (op == UUIDD_OP_BULK_TIME_UUID)) {
		if ((sizeof(uuid_t) + sizeof(*num)) <= (size_t) reply_len)
			memcpy(buf + sizeof(uuid_t), num, sizeof(*num));
		else
			*num = -1;
	}
	if ((ret > 0) && (op == UUIDD_OP_BULK_RANDOM_UUID)) {
		if (sizeof(*num) <= (size_t) reply_len)
			memcpy(buf, num, sizeof(*num));
		else
			*num = -1;
	}

	close(s);

	return ret;
}

/*
 * Exclusively create and open a pid file with path @pidfile_path
 *
 * Return file descriptor of the created pid_file.
 */
static int create_pidfile(struct uuidd_cxt_t *cxt, const char *pidfile_path)
{
	int		fd_pidfile;
	struct flock	fl;

	fd_pidfile = open(pidfile_path, O_CREAT | O_RDWR, 0664);
	if (fd_pidfile < 0) {
		if (!cxt->quiet)
			warn(_("cannot open %s"), pidfile_path);
		exit(EXIT_FAILURE);
	}
	cxt->cleanup_pidfile = pidfile_path;

	fl.l_type = F_WRLCK;
	fl.l_whence = SEEK_SET;
	fl.l_start = 0;
	fl.l_len = 0;
	fl.l_pid = 0;
	while (fcntl(fd_pidfile, F_SETLKW, &fl) < 0) {
		if ((errno == EAGAIN) || (errno == EINTR))
			continue;
		if (!cxt->quiet)
			warn(_("cannot lock %s"), pidfile_path);
		exit(EXIT_FAILURE);
	}

	return fd_pidfile;
}

/*
 * Create AF_UNIX, SOCK_STREAM socket and bind to @socket_path
 *
 * If @will_fork is true, then make sure the descriptor
 * of the socket is >2, so that it won't be later closed
 * during create_daemon().
 *
 * Return file descriptor corresponding to created socket.
 */
static int create_socket(struct uuidd_cxt_t *uuidd_cxt,
			 const char *socket_path, int will_fork)
{
	struct sockaddr_un	my_addr;
	mode_t			save_umask;
	int			s;

	if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
		if (!uuidd_cxt->quiet)
			warn(_("couldn't create unix stream socket"));
		exit(EXIT_FAILURE);
	}

	/*
	 * Make sure the socket isn't using fd numbers 0-2 to avoid it
	 * getting closed by create_daemon()
	 */
	while (will_fork && s <= 2) {
		s = dup(s);
		if (s < 0)
			err(EXIT_FAILURE, "dup");
	}

	/*
	 * Create the address we will be binding to.
	 */
	my_addr.sun_family = AF_UNIX;
	assert(strlen(socket_path) < sizeof(my_addr.sun_path));
	xstrncpy(my_addr.sun_path, socket_path, sizeof(my_addr.sun_path));
	unlink(socket_path);
	save_umask = umask(0);
	if (bind(s, (const struct sockaddr *) &my_addr,
		 sizeof(struct sockaddr_un)) < 0) {
		if (!uuidd_cxt->quiet)
			warn(_("couldn't bind unix socket %s"), socket_path);
		exit(EXIT_FAILURE);
	}
	umask(save_umask);
	uuidd_cxt->cleanup_socket = socket_path;

	return s;
}

static void __attribute__((__noreturn__)) all_done(const struct uuidd_cxt_t *uuidd_cxt, int ret)
{
	if (uuidd_cxt->cleanup_pidfile)
		unlink(uuidd_cxt->cleanup_pidfile);
	if (uuidd_cxt->cleanup_socket)
		unlink(uuidd_cxt->cleanup_socket);
	exit(ret);
}

static void handle_signal(const struct uuidd_cxt_t *uuidd_cxt, int fd)
{
	struct signalfd_siginfo info;
	ssize_t bytes;

	bytes = read(fd, &info, sizeof(info));
	if (bytes != sizeof(info)) {
		if (errno == EAGAIN)
			return;
		warn(_("receiving signal failed"));
		info.ssi_signo = 0;
	}
	if (info.ssi_signo == SIGPIPE)
		return;		/* ignored */
	all_done(uuidd_cxt, EXIT_SUCCESS);
}

static void timeout_handler(int sig __attribute__((__unused__)),
			    siginfo_t * info,
			    void *context __attribute__((__unused__)))
{
#ifdef HAVE_TIMER_CREATE
	if (info->si_code == SI_TIMER)
#endif
		errx(EXIT_FAILURE, _("timed out"));
}

static void server_loop(const char *socket_path, const char *pidfile_path,
			struct uuidd_cxt_t *uuidd_cxt)
{
	struct sockaddr_un	from_addr;
	socklen_t		fromlen;
	int32_t			reply_len = 0;
	uuid_t			uu;
	char			reply_buf[UUIDD_PROT_BUFSZ], *cp;
	uuidd_prot_op_t 	op;
	char			str[UUID_STR_LEN];
	int			i, ns, len;
	uuidd_prot_num_t	num;		/* intentionally uninitialized */
	int			s = 0;
	int			fd_pidfile = -1;
	int			ret;
	struct pollfd		pfd[2];
	sigset_t		sigmask;
	int			sigfd;
	enum {
				POLLFD_SIGNAL = 0,
				POLLFD_SOCKET
	};

#ifdef HAVE_LIBSYSTEMD
	if (!uuidd_cxt->no_sock)	/* no_sock implies no_fork and no_pid */
#endif
	{
		struct ul_timer timer;
		struct itimerval timeout;

		memset(&timeout, 0, sizeof timeout);
		timeout.it_value.tv_sec = 30;
		if (setup_timer(&timer, &timeout, &timeout_handler))
			err(EXIT_FAILURE, _("cannot set up timer"));
		if (pidfile_path)
			fd_pidfile = create_pidfile(uuidd_cxt, pidfile_path);
		ret = call_daemon(socket_path, UUIDD_OP_GETPID, reply_buf,
				  sizeof(reply_buf), 0, NULL);
		cancel_timer(&timer);
		if (ret > 0) {
			if (!uuidd_cxt->quiet)
				warnx(_("uuidd daemon is already running at pid %s"),
					reply_buf);
			exit(EXIT_FAILURE);
		}

		s = create_socket(uuidd_cxt, socket_path,
				  (!uuidd_cxt->debug || !uuidd_cxt->no_fork));
		if (listen(s, SOMAXCONN) < 0) {
			if (!uuidd_cxt->quiet)
				warn(_("couldn't listen on unix socket %s"), socket_path);
			exit(EXIT_FAILURE);
		}

		if (!uuidd_cxt->debug && !uuidd_cxt->no_fork)
			create_daemon();

		if (pidfile_path) {
			snprintf(reply_buf, sizeof(reply_buf), "%8d\n", getpid());
			if (ftruncate(fd_pidfile, 0))
				err(EXIT_FAILURE, _("could not truncate file: %s"), pidfile_path);
			write_all(fd_pidfile, reply_buf, strlen(reply_buf));
			if (fd_pidfile > 1 && close_fd(fd_pidfile) != 0)
				err(EXIT_FAILURE, _("write failed: %s"), pidfile_path);
		}

	}

#ifdef HAVE_LIBSYSTEMD
	if (uuidd_cxt->no_sock) {
		const int r = sd_listen_fds(0);

		if (r < 0) {
			errno = r * -1;
			err(EXIT_FAILURE, _("sd_listen_fds() failed"));
		} else if (r == 0)
			errx(EXIT_FAILURE,
			     _("no file descriptors received, check systemctl status uuidd.socket"));
		else if (1 < r)
			errx(EXIT_FAILURE,
			     _("too many file descriptors received, check uuidd.socket"));
		s = SD_LISTEN_FDS_START + 0;
	}
#endif

	sigemptyset(&sigmask);
	sigaddset(&sigmask, SIGHUP);
	sigaddset(&sigmask, SIGINT);
	sigaddset(&sigmask, SIGTERM);
	sigaddset(&sigmask, SIGALRM);
	sigaddset(&sigmask, SIGPIPE);
	/* Block signals so that they aren't handled according to their
	 * default dispositions */
	sigprocmask(SIG_BLOCK, &sigmask, NULL);
	if ((sigfd = signalfd(-1, &sigmask, 0)) < 0)
		err(EXIT_FAILURE, _("cannot set signal handler"));

	pfd[POLLFD_SIGNAL].fd = sigfd;
	pfd[POLLFD_SOCKET].fd = s;
	pfd[POLLFD_SIGNAL].events = pfd[POLLFD_SOCKET].events = POLLIN | POLLERR | POLLHUP;

	while (1) {
		ret = poll(pfd, ARRAY_SIZE(pfd),
				uuidd_cxt->timeout ?
					(int) uuidd_cxt->timeout * 1000 : -1);
		if (ret < 0) {
			if (errno == EAGAIN)
				continue;
			warn(_("poll failed"));
			all_done(uuidd_cxt, EXIT_FAILURE);
		}
		if (ret == 0) {		/* true when poll() times out */
			if (uuidd_cxt->debug)
				fprintf(stderr, _("timeout [%d sec]\n"), uuidd_cxt->timeout);
			all_done(uuidd_cxt, EXIT_SUCCESS);
		}
		if (pfd[POLLFD_SIGNAL].revents != 0)
			handle_signal(uuidd_cxt, sigfd);
		if (pfd[POLLFD_SOCKET].revents == 0)
			continue;
		fromlen = sizeof(from_addr);
		ns = accept(s, (struct sockaddr *) &from_addr, &fromlen);
		if (ns < 0) {
			if ((errno == EAGAIN) || (errno == EINTR))
				continue;
			err(EXIT_FAILURE, "accept");
		}
		len = read(ns, &op, sizeof(op));
		if (len != sizeof(op)) {
			if (len < 0)
				warn(_("read failed"));
			else
				warnx(_("error reading from client, len = %d"),
						len);
			goto shutdown_socket;
		}
		if ((op == UUIDD_OP_BULK_TIME_UUID) ||
		    (op == UUIDD_OP_BULK_RANDOM_UUID)) {
			if (read_all(ns, (char *) &num, sizeof(num)) != sizeof(num))
				goto shutdown_socket;
			if (uuidd_cxt->debug)
				fprintf(stderr, _("operation %d, incoming num = %d\n"),
				       op, num);
		} else if (uuidd_cxt->debug)
			fprintf(stderr, _("operation %d\n"), op);

		switch (op) {
		case UUIDD_OP_GETPID:
			snprintf(reply_buf, sizeof(reply_buf), "%d", getpid());
			reply_len = strlen(reply_buf) + 1;
			break;
		case UUIDD_OP_GET_MAXOP:
			snprintf(reply_buf, sizeof(reply_buf), "%d", UUIDD_MAX_OP);
			reply_len = strlen(reply_buf) + 1;
			break;
		case UUIDD_OP_TIME_UUID:
			num = 1;
			if (__uuid_generate_time(uu, &num) < 0 && !uuidd_cxt->quiet)
				warnx(_("failed to open/lock clock counter"));
			if (uuidd_cxt->debug) {
				uuid_unparse(uu, str);
				fprintf(stderr, _("Generated time UUID: %s\n"), str);
			}
			memcpy(reply_buf, uu, sizeof(uu));
			reply_len = sizeof(uu);
			break;
		case UUIDD_OP_RANDOM_UUID:
			num = 1;
			if (__uuid_generate_time(uu, &num) < 0 && !uuidd_cxt->quiet)
				warnx(_("failed to open/lock clock counter"));
			if (uuidd_cxt->debug) {
				uuid_unparse(uu, str);
				fprintf(stderr, _("Generated random UUID: %s\n"), str);
			}
			memcpy(reply_buf, uu, sizeof(uu));
			reply_len = sizeof(uu);
			break;
		case UUIDD_OP_BULK_TIME_UUID:
			if (__uuid_generate_time(uu, &num) < 0 && !uuidd_cxt->quiet)
				warnx(_("failed to open/lock clock counter"));
			if (uuidd_cxt->debug) {
				uuid_unparse(uu, str);
				fprintf(stderr, P_("Generated time UUID %s "
						   "and %d following\n",
						   "Generated time UUID %s "
						   "and %d following\n", num - 1),
				       str, num - 1);
			}
			memcpy(reply_buf, uu, sizeof(uu));
			reply_len = sizeof(uu);
			memcpy(reply_buf + reply_len, &num, sizeof(num));
			reply_len += sizeof(num);
			break;
		case UUIDD_OP_BULK_RANDOM_UUID:
			if (num < 0)
				num = 1;
			if ((sizeof(reply_buf) - sizeof(num)) < (size_t) (sizeof(uu) * num))
				num = (sizeof(reply_buf) - sizeof(num)) / sizeof(uu);
			__uuid_generate_random((unsigned char *) reply_buf +
					      sizeof(num), &num);
			reply_len = sizeof(num) + (sizeof(uu) * num);
			memcpy(reply_buf, &num, sizeof(num));
			if (uuidd_cxt->debug) {
				fprintf(stderr, P_("Generated %d UUID:\n",
						   "Generated %d UUIDs:\n", num), num);
				cp = reply_buf + sizeof(num);
				for (i = 0; i < num; i++) {
					uuid_unparse((unsigned char *)cp, str);
					fprintf(stderr, "\t%s\n", str);
					cp += sizeof(uu);
				}
			}
			break;
		default:
			if (uuidd_cxt->debug)
				fprintf(stderr, _("Invalid operation %d\n"), op);
			goto shutdown_socket;
		}
		write_all(ns, (char *) &reply_len, sizeof(num));
		write_all(ns, reply_buf, reply_len);
	shutdown_socket:
		close(ns);
	}
}

static void __attribute__ ((__noreturn__)) unexpected_size(int size)
{
	errx(EXIT_FAILURE, _("Unexpected reply length from server %d"), size);
}

static void parse_options(int argc, char **argv, struct uuidd_cxt_t *uuidd_cxt,
			  struct uuidd_options_t *uuidd_opts)
{
	const struct option longopts[] = {
		{"pid", required_argument, NULL, 'p'},
		{"socket", required_argument, NULL, 's'},
		{"timeout", required_argument, NULL, 'T'},
		{"kill", no_argument, NULL, 'k'},
		{"random", no_argument, NULL, 'r'},
		{"time", no_argument, NULL, 't'},
		{"uuids", required_argument, NULL, 'n'},
		{"no-pid", no_argument, NULL, 'P'},
		{"no-fork", no_argument, NULL, 'F'},
		{"socket-activation", no_argument, NULL, 'S'},
		{"debug", no_argument, NULL, 'd'},
		{"quiet", no_argument, NULL, 'q'},
		{"version", no_argument, NULL, 'V'},
		{"help", no_argument, NULL, 'h'},
		{NULL, 0, NULL, 0}
	};
	const ul_excl_t excl[] = {
		{ 'P', 'p' },
		{ 'd', 'q' },
		{ 'r', 't' },
		{ 0 }
	};
	int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
	int c;

	while ((c = getopt_long(argc, argv, "p:s:T:krtn:PFSdqVh", longopts, NULL)) != -1) {
		err_exclusive_options(c, longopts, excl, excl_st);
		switch (c) {
		case 'd':
			uuidd_cxt->debug = 1;
			break;
		case 'k':
			uuidd_opts->do_kill = 1;
			break;
		case 'n':
			uuidd_opts->num = (uuidd_prot_num_t) strtou16_or_err(optarg,
						_("failed to parse --uuids"));
			break;
		case 'p':
			uuidd_opts->pidfile_path = optarg;
			break;
		case 'P':
			uuidd_opts->no_pid = 1;
			break;
		case 'F':
			uuidd_cxt->no_fork = 1;
			break;
		case 'S':
#ifdef HAVE_LIBSYSTEMD
			uuidd_cxt->no_sock = 1;
			uuidd_cxt->no_fork = 1;
			uuidd_opts->no_pid = 1;
#else
			errx(EXIT_FAILURE, _("uuidd has been built without "
					     "support for socket activation"));
#endif
			break;
		case 'q':
			uuidd_cxt->quiet = 1;
			break;
		case 'r':
			uuidd_opts->do_type = UUIDD_OP_RANDOM_UUID;
			break;
		case 's':
			uuidd_opts->socket_path = optarg;
			uuidd_opts->s_flag = 1;
			break;
		case 't':
			uuidd_opts->do_type = UUIDD_OP_TIME_UUID;
			break;
		case 'T':
			uuidd_cxt->timeout = strtou32_or_err(optarg,
						_("failed to parse --timeout"));
			break;

		case 'V':
			print_version(EXIT_SUCCESS);
		case 'h':
			usage();
		default:
			errtryhelp(EXIT_FAILURE);
		}
	}

	if (0 < uuidd_opts->num) {
		switch (uuidd_opts->do_type) {
		case UUIDD_OP_RANDOM_UUID:
			uuidd_opts->do_type = UUIDD_OP_BULK_RANDOM_UUID;
			break;
		case UUIDD_OP_TIME_UUID:
			uuidd_opts->do_type = UUIDD_OP_BULK_TIME_UUID;
			break;
		}
	}
}

int main(int argc, char **argv)
{
	const char	*err_context = NULL;
	char		*cp;
	int		ret;

	struct uuidd_cxt_t uuidd_cxt = { .timeout = 0 };
	struct uuidd_options_t uuidd_opts = { .socket_path = UUIDD_SOCKET_PATH };

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	close_stdout_atexit();

	parse_options(argc, argv, &uuidd_cxt, &uuidd_opts);

	if (strlen(uuidd_opts.socket_path) >= sizeof(((struct sockaddr_un *)0)->sun_path))
		errx(EXIT_FAILURE, _("socket name too long: %s"), uuidd_opts.socket_path);

	if (!uuidd_opts.no_pid && !uuidd_opts.pidfile_path)
		uuidd_opts.pidfile_path = UUIDD_PIDFILE_PATH;

	/* custom socket path and socket-activation make no sense */
	if (uuidd_opts.s_flag && uuidd_cxt.no_sock && !uuidd_cxt.quiet)
		warnx(_("Both --socket-activation and --socket specified. "
			"Ignoring --socket."));

	if (uuidd_opts.num && uuidd_opts.do_type) {
		char buf[UUIDD_PROT_BUFSZ];
		char str[UUID_STR_LEN];

		ret = call_daemon(uuidd_opts.socket_path, uuidd_opts.do_type, buf,
				  sizeof(buf), &uuidd_opts.num, &err_context);

		if (ret < 0)
			err(EXIT_FAILURE, _("error calling uuidd daemon (%s)"),
					err_context ? : _("unexpected error"));

		if (uuidd_opts.do_type == UUIDD_OP_BULK_TIME_UUID) {
			if (ret != sizeof(uuid_t) + sizeof(uuidd_opts.num))
				unexpected_size(ret);

			uuid_unparse((unsigned char *) buf, str);

			printf(P_("%s and %d subsequent UUID\n",
				  "%s and %d subsequent UUIDs\n", uuidd_opts.num - 1),
			       str, uuidd_opts.num - 1);
		} else {
			int i;

			printf(_("List of UUIDs:\n"));
			cp = buf + sizeof(uuidd_opts.num);
			if (ret != (int) (sizeof(uuidd_opts.num) + uuidd_opts.num * sizeof(uuid_t)))
				unexpected_size(ret);
			for (i = 0; i < uuidd_opts.num; i++, cp += sizeof(uuid_t)) {
				uuid_unparse((unsigned char *) cp, str);
				printf("\t%s\n", str);
			}
		}
		return EXIT_SUCCESS;
	}

	if (uuidd_opts.do_type) {
		uuid_t uu;
		char str[UUID_STR_LEN];

		ret = call_daemon(uuidd_opts.socket_path, uuidd_opts.do_type, (char *) &uu,
				  sizeof(uu), 0, &err_context);

		if (ret < 0)
			err(EXIT_FAILURE, _("error calling uuidd daemon (%s)"),
					err_context ? : _("unexpected error"));
		if (ret != sizeof(uu))
		        unexpected_size(ret);

		uuid_unparse(uu, str);

		printf("%s\n", str);
		return EXIT_SUCCESS;
	}

	if (uuidd_opts.do_kill) {
		char buf[16];

		ret = call_daemon(uuidd_opts.socket_path, UUIDD_OP_GETPID, buf, sizeof(buf), 0, NULL);
		if (0 < ret) {
			pid_t pid;

			pid = (pid_t)strtou32_or_err(buf, _("failed to parse pid"));
			ret = kill(pid, SIGTERM);
			if (ret < 0) {
				if (!uuidd_cxt.quiet)
					warn(_("couldn't kill uuidd running "
						  "at pid %d"), pid);
				return EXIT_FAILURE;
			}
			if (!uuidd_cxt.quiet)
				printf(_("Killed uuidd running at pid %d.\n"), pid);
		}
		return EXIT_SUCCESS;
	}

	server_loop(uuidd_opts.socket_path, uuidd_opts.pidfile_path, &uuidd_cxt);
	return EXIT_SUCCESS;
}