sysklogd/syslogd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini syslogd implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
   8  *
   9  * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
  10  *
  11  * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
  12  *
  13  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  14  */
  15
  16 #include "busybox.h"
  17 #include <paths.h>
  18 #include <sys/un.h>
  19
  20 /* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
  21 #define SYSLOG_NAMES
  22 #include <sys/syslog.h>
  23 #include <sys/uio.h>
  24
  25 #define DEBUG 0
  26
  27 /* Path to the unix socket */
  28 static char *dev_log_name;
  29
  30 /* Path for the file where all log messages are written */
  31 static const char *logFilePath = "/var/log/messages";
  32 static int logFD = -1;
  33
  34 /* interval between marks in seconds */
  35 static int markInterval = 20 * 60;
  36
  37 /* level of messages to be locally logged */
  38 static int logLevel = 8;
  39
  40 /* localhost's name */
  41 static char localHostName[64];
  42
  43 #if ENABLE_FEATURE_ROTATE_LOGFILE
  44 /* max size of message file before being rotated */
  45 static unsigned logFileSize = 200 * 1024;
  46 /* number of rotated message files */
  47 static unsigned logFileRotate = 1;
  48 static unsigned curFileSize;
  49 static smallint isRegular;
  50 #endif
  51
  52 #if ENABLE_FEATURE_REMOTE_LOG
  53 #include <netinet/in.h>
  54 /* udp socket for logging to remote host */
  55 static int remoteFD = -1;
  56 static struct sockaddr_in remoteAddr;
  57 #endif
  58
  59
  60 /* NB: we may need 2x this amount on stack... */
  61 enum { MAX_READ = 1024 };
  62
  63
  64 /* options */
  65 /* Correct regardless of combination of CONFIG_xxx */
  66 enum {
  67         OPTBIT_mark = 0, // -m
  68         OPTBIT_nofork, // -n
  69         OPTBIT_outfile, // -O
  70         OPTBIT_loglevel, // -l
  71         OPTBIT_small, // -S
  72         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
  73         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
  74         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
  75         USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L
  76         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
  77
  78         OPT_mark        = 1 << OPTBIT_mark    ,
  79         OPT_nofork      = 1 << OPTBIT_nofork  ,
  80         OPT_outfile     = 1 << OPTBIT_outfile ,
  81         OPT_loglevel    = 1 << OPTBIT_loglevel,
  82         OPT_small       = 1 << OPTBIT_small   ,
  83         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
  84         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
  85         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
  86         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
  87         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
  88 };
  89 #define OPTION_STR "m:nO:l:S" \
  90         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
  91         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
  92         USE_FEATURE_REMOTE_LOG(    "R:" ) \
  93         USE_FEATURE_REMOTE_LOG(    "L"  ) \
  94         USE_FEATURE_IPC_SYSLOG(    "C::")
  95 #define OPTION_DECL *opt_m, *opt_l \
  96         USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
  97         USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
  98         USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
  99         USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
 100 #define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
 101         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 102         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 103         USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 104         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 105
 106
 107 /* circular buffer variables/structures */
 108 #if ENABLE_FEATURE_IPC_SYSLOG
 109
 110
 111 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 112 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 113 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 114 #endif
 115
 116 #include <sys/ipc.h>
 117 #include <sys/sem.h>
 118 #include <sys/shm.h>
 119
 120 /* our shared key */
 121 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 122
 123 // Semaphore operation structures
 124 static struct shbuf_ds {
 125         int32_t size;   // size of data written
 126         int32_t head;   // start of message list
 127         int32_t tail;   // end of message list
 128         char data[1];   // data/messages
 129 } *shbuf;               // shared memory pointer
 130
 131 static int shmid = -1;   // ipc shared memory id
 132 static int s_semid = -1; // ipc semaphore id
 133 static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);   // default shm size
 134
 135 static void ipcsyslog_cleanup(void)
 136 {
 137         if (shmid != -1) {
 138                 shmdt(shbuf);
 139         }
 140         if (shmid != -1) {
 141                 shmctl(shmid, IPC_RMID, NULL);
 142         }
 143         if (s_semid != -1) {
 144                 semctl(s_semid, 0, IPC_RMID, 0);
 145         }
 146 }
 147
 148 static void ipcsyslog_init(void)
 149 {
 150         if (DEBUG)
 151                 printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
 152
 153         shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
 154         if (shmid == -1) {
 155                 bb_perror_msg_and_die("shmget");
 156         }
 157
 158         shbuf = shmat(shmid, NULL, 0);
 159         if (!shbuf) {
 160                 bb_perror_msg_and_die("shmat");
 161         }
 162
 163         shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
 164         shbuf->head = shbuf->tail = 0;
 165
 166         // we'll trust the OS to set initial semval to 0 (let's hope)
 167         s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 168         if (s_semid == -1) {
 169                 if (errno == EEXIST) {
 170                         s_semid = semget(KEY_ID, 2, 0);
 171                         if (s_semid != -1)
 172                                 return;
 173                 }
 174                 bb_perror_msg_and_die("semget");
 175         }
 176 }
 177
 178 /* write message to buffer */
 179 static void log_to_shmem(const char *msg, int len)
 180 {
 181         static /*const*/ struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
 182         static /*const*/ struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
 183
 184         int old_tail, new_tail;
 185         char *c;
 186
 187         if (semop(s_semid, SMwdn, 3) == -1) {
 188                 bb_perror_msg_and_die("SMwdn");
 189         }
 190
 191         /* Circular Buffer Algorithm:
 192          * --------------------------
 193          * tail == position where to store next syslog message.
 194          * head == position of next message to retrieve ("print").
 195          * if head == tail, there is no "unprinted" messages left.
 196          * head is typically advanced by separate "reader" program,
 197          * but if there isn't one, we have to do it ourself.
 198          * messages are NUL-separated.
 199          */
 200         len++; /* length with NUL included */
 201  again:
 202         old_tail = shbuf->tail;
 203         new_tail = old_tail + len;
 204         if (new_tail < shbuf->size) {
 205                 /* No need to move head if shbuf->head <= old_tail,
 206                  * else... */
 207                 if (old_tail < shbuf->head && shbuf->head <= new_tail) {
 208                         /* ...need to move head forward */
 209                         c = memchr(shbuf->data + new_tail, '\0',
 210                                            shbuf->size - new_tail);
 211                         if (!c) /* no NUL ahead of us, wrap around */
 212                                 c = memchr(shbuf->data, '\0', old_tail);
 213                         if (!c) { /* still nothing? point to this msg... */
 214                                 shbuf->head = old_tail;
 215                         } else {
 216                                 /* convert pointer to offset + skip NUL */
 217                                 shbuf->head = c - shbuf->data + 1;
 218                         }
 219                 }
 220                 /* store message, set new tail */
 221                 memcpy(shbuf->data + old_tail, msg, len);
 222                 shbuf->tail = new_tail;
 223         } else {
 224                 /* we need to break up the message and wrap it around */
 225                 /* k == available buffer space ahead of old tail */
 226                 int k = shbuf->size - old_tail - 1;
 227                 if (shbuf->head > old_tail) {
 228                         /* we are going to overwrite head, need to
 229                          * move it out of the way */
 230                         c = memchr(shbuf->data, '\0', old_tail);
 231                         if (!c) { /* nothing? point to this msg... */
 232                                 shbuf->head = old_tail;
 233                         } else { /* convert pointer to offset + skip NUL */
 234                                 shbuf->head = c - shbuf->data + 1;
 235                         }
 236                 }
 237                 /* copy what fits to the end of buffer, and repeat */
 238                 memcpy(shbuf->data + old_tail, msg, k);
 239                 msg += k;
 240                 len -= k;
 241                 shbuf->tail = 0;
 242                 goto again;
 243         }
 244         if (semop(s_semid, SMwup, 1) == -1) {
 245                 bb_perror_msg_and_die("SMwup");
 246         }
 247         if (DEBUG)
 248                 printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
 249 }
 250 #else
 251 void ipcsyslog_cleanup(void);
 252 void ipcsyslog_init(void);
 253 void log_to_shmem(const char *msg);
 254
 255
 256 #endif /* FEATURE_IPC_SYSLOG */
 257
 258
 259 /* Print a message to the log file. */
 260 static void log_locally(char *msg)
 261 {
 262         static time_t last;
 263
 264         struct flock fl;
 265         int len = strlen(msg);
 266
 267 #if ENABLE_FEATURE_IPC_SYSLOG
 268         if ((option_mask32 & OPT_circularlog) && shbuf) {
 269                 log_to_shmem(msg, len);
 270                 return;
 271         }
 272 #endif
 273         if (logFD >= 0) {
 274                 time_t cur;
 275                 time(&cur);
 276                 if (last != cur) {
 277                         last = cur; /* reopen log file every second */
 278                         close(logFD);
 279                         goto reopen;
 280                 }
 281         } else {
 282                 struct stat statf;
 283  reopen:
 284                 logFD = device_open(logFilePath, O_WRONLY | O_CREAT
 285                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 286                 if (logFD < 0) {
 287                         /* cannot open logfile? - print to /dev/console then */
 288                         int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 289                         if (fd < 0)
 290                                 fd = 2; /* then stderr, dammit */
 291                         full_write(fd, msg, len);
 292                         if (fd != 2)
 293                                 close(fd);
 294                         return;
 295                 }
 296 #if ENABLE_FEATURE_ROTATE_LOGFILE
 297                 isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
 298                 /* bug (mostly harmless): can wrap around if file > 4gb */
 299                 curFileSize = statf.st_size;
 300 #endif
 301         }
 302
 303         fl.l_whence = SEEK_SET;
 304         fl.l_start = 0;
 305         fl.l_len = 1;
 306         fl.l_type = F_WRLCK;
 307         fcntl(logFD, F_SETLKW, &fl);
 308
 309 #if ENABLE_FEATURE_ROTATE_LOGFILE
 310         if (logFileSize && isRegular && curFileSize > logFileSize) {
 311                 if (logFileRotate) { /* always 0..99 */
 312                         int i = strlen(logFilePath) + 3 + 1;
 313                         char oldFile[i];
 314                         char newFile[i];
 315                         i = logFileRotate - 1;
 316                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 317                         while (1) {
 318                                 sprintf(newFile, "%s.%d", logFilePath, i);
 319                                 if (i == 0) break;
 320                                 sprintf(oldFile, "%s.%d", logFilePath, --i);
 321                                 rename(oldFile, newFile);
 322                         }
 323                         /* newFile == "f.0" now */
 324                         rename(logFilePath, newFile);
 325                         fl.l_type = F_UNLCK;
 326                         fcntl(logFD, F_SETLKW, &fl);
 327                         close(logFD);
 328                         goto reopen;
 329                 }
 330                 ftruncate(logFD, 0);
 331         }
 332 #endif
 333         curFileSize += full_write(logFD, msg, len);
 334         fl.l_type = F_UNLCK;
 335         fcntl(logFD, F_SETLKW, &fl);
 336 }
 337
 338 static void parse_fac_prio_20(int pri, char *res20)
 339 {
 340         CODE *c_pri, *c_fac;
 341
 342         if (pri != 0) {
 343                 c_fac = facilitynames;
 344                 while (c_fac->c_name) {
 345                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 346                                 c_fac++; continue;
 347                         }
 348                         /* facility is found, look for prio */
 349                         c_pri = prioritynames;
 350                         while (c_pri->c_name) {
 351                                 if (c_pri->c_val != LOG_PRI(pri)) {
 352                                         c_pri++; continue;
 353                                 }
 354                                 snprintf(res20, 20, "%s.%s",
 355                                                 c_fac->c_name, c_pri->c_name);
 356                                 return;
 357                         }
 358                         /* prio not found, bail out */
 359                         break;
 360                 }
 361                 snprintf(res20, 20, "<%d>", pri);
 362         }
 363 }
 364
 365 /* len parameter is used only for "is there a timestamp?" check
 366  * NB: some callers cheat and supply 0 when they know
 367  * that there is no timestamp, short-cutting the test */
 368 static void timestamp_and_log(int pri, char *msg, int len)
 369 {
 370         time_t now;
 371         char *timestamp;
 372
 373         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 374          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 375         ) {
 376                 time(&now);
 377                 timestamp = ctime(&now) + 4;
 378         } else {
 379                 timestamp = msg;
 380                 msg += 16;
 381         }
 382         timestamp[15] = '\0';
 383
 384         /* Log message locally (to file or shared mem) */
 385         if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
 386                 if (LOG_PRI(pri) < logLevel) {
 387                         if (option_mask32 & OPT_small)
 388                                 msg = xasprintf("%s %s\n", timestamp, msg);
 389                         else {
 390                                 char res[20];
 391                                 parse_fac_prio_20(pri, res);
 392                                 msg = xasprintf("%s %s %s %s\n", timestamp, localHostName, res, msg);
 393                         }
 394                         log_locally(msg);
 395                         free(msg);
 396                 }
 397         }
 398 }
 399
 400 static void split_escape_and_log(char *tmpbuf, int len)
 401 {
 402         char line[len * 2 + 1]; /* gcc' cheap alloca */
 403         char *p = tmpbuf;
 404
 405         tmpbuf += len;
 406         while (p < tmpbuf) {
 407                 char c;
 408                 char *q = line;
 409                 int pri = (LOG_USER | LOG_NOTICE);
 410
 411                 if (*p == '<') {
 412                         /* Parse the magic priority number. */
 413                         pri = bb_strtou(p + 1, &p, 10);
 414                         if (*p == '>') p++;
 415                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
 416                                 pri = (LOG_USER | LOG_NOTICE);
 417                         }
 418                 }
 419
 420                 while ((c = *p++)) {
 421                         if (c == '\n')
 422                                 c = ' ';
 423                         if (!(c & ~0x1f)) {
 424                                 *q++ = '^';
 425                                 c += '@'; /* ^@, ^A, ^B... */
 426                         }
 427                         *q++ = c;
 428                 }
 429                 *q = '\0';
 430                 /* now log it */
 431                 timestamp_and_log(pri, line, q - line);
 432         }
 433 }
 434
 435 static void quit_signal(int sig)
 436 {
 437         timestamp_and_log(LOG_SYSLOG | LOG_INFO, "System log daemon exiting", 0);
 438         puts("System log daemon exiting");
 439         unlink(dev_log_name);
 440         if (ENABLE_FEATURE_IPC_SYSLOG)
 441                 ipcsyslog_cleanup();
 442         exit(1);
 443 }
 444
 445 static void do_mark(int sig)
 446 {
 447         if (markInterval) {
 448                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);
 449                 alarm(markInterval);
 450         }
 451 }
 452
 453 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 454 static void do_syslogd(void)
 455 {
 456         struct sockaddr_un sunx;
 457         socklen_t addrLength;
 458         int sock_fd;
 459         fd_set fds;
 460
 461         /* Set up signal handlers. */
 462         signal(SIGINT, quit_signal);
 463         signal(SIGTERM, quit_signal);
 464         signal(SIGQUIT, quit_signal);
 465         signal(SIGHUP, SIG_IGN);
 466         signal(SIGCHLD, SIG_IGN);
 467 #ifdef SIGCLD
 468         signal(SIGCLD, SIG_IGN);
 469 #endif
 470         signal(SIGALRM, do_mark);
 471         alarm(markInterval);
 472
 473         dev_log_name = xmalloc_realpath(_PATH_LOG);
 474         if (!dev_log_name)
 475                 dev_log_name = _PATH_LOG;
 476
 477         /* Unlink old /dev/log (or object it points to) */
 478         unlink(dev_log_name);
 479
 480         memset(&sunx, 0, sizeof(sunx));
 481         sunx.sun_family = AF_UNIX;
 482         strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 483         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 484         addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
 485         if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) {
 486                 bb_perror_msg_and_die("cannot connect to socket %s", dev_log_name);
 487         }
 488
 489         if (chmod(dev_log_name, 0666) < 0) {
 490                 bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);
 491         }
 492         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 493                 ipcsyslog_init();
 494         }
 495
 496         timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);
 497
 498         for (;;) {
 499                 FD_ZERO(&fds);
 500                 FD_SET(sock_fd, &fds);
 501
 502                 if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
 503                         if (errno == EINTR) {
 504                                 /* alarm may have happened. */
 505                                 continue;
 506                         }
 507                         bb_perror_msg_and_die("select");
 508                 }
 509
 510                 if (FD_ISSET(sock_fd, &fds)) {
 511                         int i;
 512 #define tmpbuf bb_common_bufsiz1
 513                         i = recv(sock_fd, tmpbuf, MAX_READ, 0);
 514                         if (i <= 0)
 515                                 bb_perror_msg_and_die("UNIX socket error");
 516                         /* TODO: maybe supress duplicates? */
 517 #if ENABLE_FEATURE_REMOTE_LOG
 518                         /* We are not modifying log messages in any way before send */
 519                         /* Remote site cannot trust _us_ anyway and need to do validation again */
 520                         if (option_mask32 & OPT_remotelog) {
 521                                 if (-1 == remoteFD) {
 522                                         remoteFD = socket(AF_INET, SOCK_DGRAM, 0);
 523                                 }
 524                                 if (-1 != remoteFD) {
 525                                         /* send message to remote logger, ignore possible error */
 526                                         sendto(remoteFD, tmpbuf, i, MSG_DONTWAIT,
 527                                                 (struct sockaddr *) &remoteAddr,
 528                                                 sizeof(remoteAddr));
 529                                 }
 530                         }
 531 #endif
 532                         tmpbuf[i] = '\0';
 533                         split_escape_and_log(tmpbuf, i);
 534 #undef tmpbuf
 535                 } /* FD_ISSET() */
 536         } /* for */
 537 }
 538
 539 int syslogd_main(int argc, char **argv)
 540 {
 541         char OPTION_DECL;
 542         char *p;
 543
 544         /* do normal option parsing */
 545         opt_complementary = "=0"; /* no non-option params */
 546         getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
 547         if (option_mask32 & OPT_mark) // -m
 548                 markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 549         //if (option_mask32 & OPT_nofork) // -n
 550         //if (option_mask32 & OPT_outfile) // -O
 551         if (option_mask32 & OPT_loglevel) // -l
 552                 logLevel = xatou_range(opt_l, 1, 8);
 553         //if (option_mask32 & OPT_small) // -S
 554 #if ENABLE_FEATURE_ROTATE_LOGFILE
 555         if (option_mask32 & OPT_filesize) // -s
 556                 logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 557         if (option_mask32 & OPT_rotatecnt) // -b
 558                 logFileRotate = xatou_range(opt_b, 0, 99);
 559 #endif
 560 #if ENABLE_FEATURE_REMOTE_LOG
 561         if (option_mask32 & OPT_remotelog) { // -R
 562                 int port = 514;
 563                 p = strchr(opt_R, ':');
 564                 if (p) {
 565                         *p++ = '\0';
 566                         port = xatou16(p);
 567                 }
 568                 remoteAddr.sin_family = AF_INET;
 569                 /* FIXME: looks ip4-specific. need to do better */
 570                 remoteAddr.sin_addr = *(struct in_addr *) *(xgethostbyname(opt_R)->h_addr_list);
 571                 remoteAddr.sin_port = htons(port);
 572         }
 573         //if (option_mask32 & OPT_locallog) // -L
 574 #endif
 575 #if ENABLE_FEATURE_IPC_SYSLOG
 576         if ((option_mask32 & OPT_circularlog) && opt_C) // -C
 577                 shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 578 #endif
 579
 580         /* If they have not specified remote logging, then log locally */
 581         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 582                 option_mask32 |= OPT_locallog;
 583
 584         /* Store away localhost's name before the fork */
 585         gethostname(localHostName, sizeof(localHostName));
 586         p = strchr(localHostName, '.');
 587         if (p) {
 588                 *p = '\0';
 589         }
 590
 591         if (!(option_mask32 & OPT_nofork)) {
 592 #ifdef BB_NOMMU
 593                 vfork_daemon_rexec(0, 1, argc, argv, "-n");
 594 #else
 595                 xdaemon(0, 1);
 596 #endif
 597         }
 598         umask(0);
 599         do_syslogd();
 600
 601         return EXIT_SUCCESS;
 602 }