aboutsummaryrefslogtreecommitdiff
path: root/sysklogd/syslogd.c
blob: fbb85338abe145339707c087f79e3ed299dbc7ff (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
/* vi: set sw=4 ts=4: */
/*
 * Mini syslogd implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
 *
 * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
 *
 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "busybox.h"
#include <paths.h>
#include <sys/un.h>

/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
#define SYSLOG_NAMES
#include <sys/syslog.h>
#include <sys/uio.h>

#define DEBUG 0

/* Path to the unix socket */
static char *dev_log_name;

/* Path for the file where all log messages are written */
static const char *logFilePath = "/var/log/messages";
static int logFD = -1;

/* interval between marks in seconds */
static int markInterval = 20 * 60;

/* level of messages to be locally logged */
static int logLevel = 8;

/* localhost's name */
static char localHostName[64];

#if ENABLE_FEATURE_ROTATE_LOGFILE
/* max size of message file before being rotated */
static unsigned logFileSize = 200 * 1024;
/* number of rotated message files */
static unsigned logFileRotate = 1;
static unsigned curFileSize;
static smallint isRegular;
#endif

#if ENABLE_FEATURE_REMOTE_LOG
#include <netinet/in.h>
/* udp socket for logging to remote host */
static int remoteFD = -1;
static struct sockaddr_in remoteAddr;
#endif

/* We are using bb_common_bufsiz1 for buffering: */
enum { MAX_READ = (BUFSIZ/6) & ~0xf };
/* We recv into this... (size: MAX_READ ~== BUFSIZ/6) */
#define RECVBUF  bb_common_bufsiz1
/* ...then copy here, escaping control chars */
/* (can grow x2 + 1 max ~== BUFSIZ/3) */
#define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
/* ...then sprintf into this, adding timestamp (15 chars),
 * host (64), fac.prio (20) to the message */
/* (growth by: 15 + 64 + 20 + delims = ~110) */
#define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ + 0x10)
/* totals: BUFSIZ/6 + BUFSIZ/3 + BUFSIZ/3 = BUFSIZ - BUFSIZ/6
 * -- we have BUFSIZ/6 extra at the ent of PRINTBUF
 * which covers needed ~110 extra bytes (and much more) */


/* Options */
enum {
	OPTBIT_mark = 0, // -m
	OPTBIT_nofork, // -n
	OPTBIT_outfile, // -O
	OPTBIT_loglevel, // -l
	OPTBIT_small, // -S
	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,)	// -s
	USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,)	// -b
	USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,)	// -R
	USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,)	// -L
	USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,)	// -C

	OPT_mark        = 1 << OPTBIT_mark    ,
	OPT_nofork      = 1 << OPTBIT_nofork  ,
	OPT_outfile     = 1 << OPTBIT_outfile ,
	OPT_loglevel    = 1 << OPTBIT_loglevel,
	OPT_small       = 1 << OPTBIT_small   ,
	OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
	OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
	OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
	OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
	OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
};
#define OPTION_STR "m:nO:l:S" \
	USE_FEATURE_ROTATE_LOGFILE("s:" ) \
	USE_FEATURE_ROTATE_LOGFILE("b:" ) \
	USE_FEATURE_REMOTE_LOG(    "R:" ) \
	USE_FEATURE_REMOTE_LOG(    "L"  ) \
	USE_FEATURE_IPC_SYSLOG(    "C::")
#define OPTION_DECL *opt_m, *opt_l \
	USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
	USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
	USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
	USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
	USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
	USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
	USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
	USE_FEATURE_IPC_SYSLOG(    ,&opt_C)


/* circular buffer variables/structures */
#if ENABLE_FEATURE_IPC_SYSLOG


#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
#error Sorry, you must set the syslogd buffer size to at least 4KB.
#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
#endif

#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>

/* our shared key */
#define KEY_ID ((long)0x414e4547) /* "GENA" */

// Semaphore operation structures
static struct shbuf_ds {
	int32_t size;   // size of data written
	int32_t head;   // start of message list
	int32_t tail;   // end of message list
	char data[1];   // data/messages
} *shbuf;               // shared memory pointer

static int shmid = -1;   // ipc shared memory id
static int s_semid = -1; // ipc semaphore id
static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);	// default shm size

static void ipcsyslog_cleanup(void)
{
	if (shmid != -1) {
		shmdt(shbuf);
	}
	if (shmid != -1) {
		shmctl(shmid, IPC_RMID, NULL);
	}
	if (s_semid != -1) {
		semctl(s_semid, 0, IPC_RMID, 0);
	}
}

static void ipcsyslog_init(void)
{
	if (DEBUG)
		printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);

	shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
	if (shmid == -1) {
		bb_perror_msg_and_die("shmget");
	}

	shbuf = shmat(shmid, NULL, 0);
	if (!shbuf) {
		bb_perror_msg_and_die("shmat");
	}

	shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
	shbuf->head = shbuf->tail = 0;

	// we'll trust the OS to set initial semval to 0 (let's hope)
	s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
	if (s_semid == -1) {
		if (errno == EEXIST) {
			s_semid = semget(KEY_ID, 2, 0);
			if (s_semid != -1)
				return;
		}
		bb_perror_msg_and_die("semget");
	}
}

/* Write message to shared mem buffer */
static void log_to_shmem(const char *msg, int len)
{
	/* Why libc insists on these being rw? */
	static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
	static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };

	int old_tail, new_tail;
	char *c;

	if (semop(s_semid, SMwdn, 3) == -1) {
		bb_perror_msg_and_die("SMwdn");
	}

	/* Circular Buffer Algorithm:
	 * --------------------------
         * tail == position where to store next syslog message.
	 * head == position of next message to retrieve ("print").
	 * if head == tail, there is no "unprinted" messages left.
	 * head is typically advanced by separate "reader" program,
	 * but if there isn't one, we have to do it ourself.
	 * messages are NUL-separated.
	 */
	len++; /* length with NUL included */
 again:
	old_tail = shbuf->tail;
	new_tail = old_tail + len;
	if (new_tail < shbuf->size) {
		/* No need to move head if shbuf->head <= old_tail,
		 * else... */
		if (old_tail < shbuf->head && shbuf->head <= new_tail) {
			/* ...need to move head forward */
			c = memchr(shbuf->data + new_tail, '\0',
					   shbuf->size - new_tail);
			if (!c) /* no NUL ahead of us, wrap around */
				c = memchr(shbuf->data, '\0', old_tail);
			if (!c) { /* still nothing? point to this msg... */
				shbuf->head = old_tail;
			} else {
				/* convert pointer to offset + skip NUL */
				shbuf->head = c - shbuf->data + 1;
			}
		}
		/* store message, set new tail */
		memcpy(shbuf->data + old_tail, msg, len);
		shbuf->tail = new_tail;
	} else {
		/* we need to break up the message and wrap it around */
		/* k == available buffer space ahead of old tail */
		int k = shbuf->size - old_tail - 1;
		if (shbuf->head > old_tail) {
			/* we are going to overwrite head, need to
			 * move it out of the way */
			c = memchr(shbuf->data, '\0', old_tail);
			if (!c) { /* nothing? point to this msg... */
				shbuf->head = old_tail;
			} else { /* convert pointer to offset + skip NUL */
				shbuf->head = c - shbuf->data + 1;
			}
		}
		/* copy what fits to the end of buffer, and repeat */
		memcpy(shbuf->data + old_tail, msg, k);
		msg += k;
		len -= k;
		shbuf->tail = 0;
		goto again;
	}
	if (semop(s_semid, SMwup, 1) == -1) {
		bb_perror_msg_and_die("SMwup");
	}
	if (DEBUG)
		printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
}
#else
void ipcsyslog_cleanup(void);
void ipcsyslog_init(void);
void log_to_shmem(const char *msg);


#endif /* FEATURE_IPC_SYSLOG */


/* Print a message to the log file. */
static void log_locally(char *msg)
{
	static time_t last;

	struct flock fl;
	int len = strlen(msg);

#if ENABLE_FEATURE_IPC_SYSLOG
	if ((option_mask32 & OPT_circularlog) && shbuf) {
		log_to_shmem(msg, len);
		return;
	}
#endif
	if (logFD >= 0) {
		time_t cur;
		time(&cur);
		if (last != cur) {
			last = cur; /* reopen log file every second */
			close(logFD);
			goto reopen;
		}
	} else {
		struct stat statf;
 reopen:
		logFD = device_open(logFilePath, O_WRONLY | O_CREAT
					| O_NOCTTY | O_APPEND | O_NONBLOCK);
		if (logFD < 0) {
			/* cannot open logfile? - print to /dev/console then */
			int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
			if (fd < 0)
				fd = 2; /* then stderr, dammit */
			full_write(fd, msg, len);
			if (fd != 2)
				close(fd);
			return;
		}
#if ENABLE_FEATURE_ROTATE_LOGFILE
		isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
		/* bug (mostly harmless): can wrap around if file > 4gb */
		curFileSize = statf.st_size;
#endif
	}

	fl.l_whence = SEEK_SET;
	fl.l_start = 0;
	fl.l_len = 1;
	fl.l_type = F_WRLCK;
	fcntl(logFD, F_SETLKW, &fl);

#if ENABLE_FEATURE_ROTATE_LOGFILE
	if (logFileSize && isRegular && curFileSize > logFileSize) {
		if (logFileRotate) { /* always 0..99 */
			int i = strlen(logFilePath) + 3 + 1;
			char oldFile[i];
			char newFile[i];
			i = logFileRotate - 1;
			/* rename: f.8 -> f.9; f.7 -> f.8; ... */
			while (1) {
				sprintf(newFile, "%s.%d", logFilePath, i);
				if (i == 0) break;
				sprintf(oldFile, "%s.%d", logFilePath, --i);
				rename(oldFile, newFile);
			}
			/* newFile == "f.0" now */
			rename(logFilePath, newFile);
			fl.l_type = F_UNLCK;
			fcntl(logFD, F_SETLKW, &fl);
			close(logFD);
			goto reopen;
		}
		ftruncate(logFD, 0);
	}
#endif
	curFileSize += full_write(logFD, msg, len);
	fl.l_type = F_UNLCK;
	fcntl(logFD, F_SETLKW, &fl);
}

static void parse_fac_prio_20(int pri, char *res20)
{
	CODE *c_pri, *c_fac;

	if (pri != 0) {
		c_fac = facilitynames;
		while (c_fac->c_name) {
			if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
				c_fac++; continue;
			}
			/* facility is found, look for prio */
			c_pri = prioritynames;
			while (c_pri->c_name) {
				if (c_pri->c_val != LOG_PRI(pri)) {
					c_pri++; continue;
				}
				snprintf(res20, 20, "%s.%s",
						c_fac->c_name, c_pri->c_name);
				return;
			}
			/* prio not found, bail out */
			break;
		}
		snprintf(res20, 20, "<%d>", pri);
	}
}

/* len parameter is used only for "is there a timestamp?" check.
 * NB: some callers cheat and supply 0 when they know
 * that there is no timestamp, short-cutting the test. */
static void timestamp_and_log(int pri, char *msg, int len)
{
	time_t now;
	char *timestamp;

	if (len < 16 || msg[3] != ' ' || msg[6] != ' '
	 || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
	) {
		time(&now);
		timestamp = ctime(&now) + 4;
	} else {
		timestamp = msg;
		msg += 16;
	}
	timestamp[15] = '\0';

	/* Log message locally (to file or shared mem) */
	if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
		if (LOG_PRI(pri) < logLevel) {
			if (option_mask32 & OPT_small)
				sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
			else {
				char res[20];
				parse_fac_prio_20(pri, res);
				sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
			}
			log_locally(PRINTBUF);
		}
	}
}

static void split_escape_and_log(char *tmpbuf, int len)
{
	char *p = tmpbuf;

	tmpbuf += len;
	while (p < tmpbuf) {
		char c;
		char *q = PARSEBUF;
		int pri = (LOG_USER | LOG_NOTICE);

		if (*p == '<') {
			/* Parse the magic priority number */
			pri = bb_strtou(p + 1, &p, 10);
			if (*p == '>') p++;
			if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
				pri = (LOG_USER | LOG_NOTICE);
			}
		}

		while ((c = *p++)) {
			if (c == '\n')
				c = ' ';
			if (!(c & ~0x1f)) {
				*q++ = '^';
				c += '@'; /* ^@, ^A, ^B... */
			}
			*q++ = c;
		}
		*q = '\0';
		/* Now log it */
		timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
	}
}

static void quit_signal(int sig)
{
	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "System log daemon exiting", 0);
	puts("System log daemon exiting");
	unlink(dev_log_name);
	if (ENABLE_FEATURE_IPC_SYSLOG)
		ipcsyslog_cleanup();
	exit(1);
}

static void do_mark(int sig)
{
	if (markInterval) {
		timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);
		alarm(markInterval);
	}
}

static void do_syslogd(void) ATTRIBUTE_NORETURN;
static void do_syslogd(void)
{
	struct sockaddr_un sunx;
	socklen_t addrLength;
	int sock_fd;
	fd_set fds;

	/* Set up signal handlers. */
	signal(SIGINT, quit_signal);
	signal(SIGTERM, quit_signal);
	signal(SIGQUIT, quit_signal);
	signal(SIGHUP, SIG_IGN);
	signal(SIGCHLD, SIG_IGN);
#ifdef SIGCLD
	signal(SIGCLD, SIG_IGN);
#endif
	signal(SIGALRM, do_mark);
	alarm(markInterval);

	dev_log_name = xmalloc_realpath(_PATH_LOG);
	if (!dev_log_name)
		dev_log_name = _PATH_LOG;

	/* Unlink old /dev/log (or object it points to) */
	unlink(dev_log_name);

	memset(&sunx, 0, sizeof(sunx));
	sunx.sun_family = AF_UNIX;
	strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
	sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
	addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
	if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) {
		bb_perror_msg_and_die("cannot connect to socket %s", dev_log_name);
	}

	if (chmod(dev_log_name, 0666) < 0) {
		bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);
	}
	if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
		ipcsyslog_init();
	}

	timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);

	for (;;) {
		FD_ZERO(&fds);
		FD_SET(sock_fd, &fds);

		if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
			if (errno == EINTR) {
				/* alarm may have happened. */
				continue;
			}
			bb_perror_msg_and_die("select");
		}

		if (FD_ISSET(sock_fd, &fds)) {
			int i;
			i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
			if (i <= 0)
				bb_perror_msg_and_die("UNIX socket error");
			/* TODO: maybe suppress duplicates? */
#if ENABLE_FEATURE_REMOTE_LOG
			/* We are not modifying log messages in any way before send */
			/* Remote site cannot trust _us_ anyway and need to do validation again */
			if (option_mask32 & OPT_remotelog) {
				if (-1 == remoteFD) {
					remoteFD = socket(AF_INET, SOCK_DGRAM, 0);
				}
				if (-1 != remoteFD) {
					/* send message to remote logger, ignore possible error */
					sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
						(struct sockaddr *) &remoteAddr,
						sizeof(remoteAddr));
				}
			}
#endif
			RECVBUF[i] = '\0';
			split_escape_and_log(RECVBUF, i);
		} /* FD_ISSET() */
	} /* for */
}

int syslogd_main(int argc, char **argv)
{
	char OPTION_DECL;
	char *p;

	/* do normal option parsing */
	opt_complementary = "=0"; /* no non-option params */
	getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
	if (option_mask32 & OPT_mark) // -m
		markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
	//if (option_mask32 & OPT_nofork) // -n
	//if (option_mask32 & OPT_outfile) // -O
	if (option_mask32 & OPT_loglevel) // -l
		logLevel = xatou_range(opt_l, 1, 8);
	//if (option_mask32 & OPT_small) // -S
#if ENABLE_FEATURE_ROTATE_LOGFILE
	if (option_mask32 & OPT_filesize) // -s
		logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
	if (option_mask32 & OPT_rotatecnt) // -b
		logFileRotate = xatou_range(opt_b, 0, 99);
#endif
#if ENABLE_FEATURE_REMOTE_LOG
	if (option_mask32 & OPT_remotelog) { // -R
		int port = 514;
		p = strchr(opt_R, ':');
		if (p) {
			*p++ = '\0';
			port = xatou16(p);
		}
		remoteAddr.sin_family = AF_INET;
		/* FIXME: looks ip4-specific. need to do better */
		remoteAddr.sin_addr = *(struct in_addr *) *(xgethostbyname(opt_R)->h_addr_list);
		remoteAddr.sin_port = htons(port);
	}
	//if (option_mask32 & OPT_locallog) // -L
#endif
#if ENABLE_FEATURE_IPC_SYSLOG
	if ((option_mask32 & OPT_circularlog) && opt_C) // -C
		shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
#endif

	/* If they have not specified remote logging, then log locally */
	if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
		option_mask32 |= OPT_locallog;

	/* Store away localhost's name before the fork */
	gethostname(localHostName, sizeof(localHostName));
	p = strchr(localHostName, '.');
	if (p) {
		*p = '\0';
	}

	if (!(option_mask32 & OPT_nofork)) {
#ifdef BB_NOMMU
		vfork_daemon_rexec(0, 1, argc, argv, "-n");
#else
		xdaemon(0, 1);
#endif
	}
	umask(0);
	do_syslogd();

	return EXIT_SUCCESS;
}