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 for the file where all log messages are written */
  28 static const char *logFilePath = "/var/log/messages";
  29 static int logFD = -1;
  30
  31 /* interval between marks in seconds */
  32 static int markInterval = 20 * 60;
  33
  34 /* level of messages to be locally logged */
  35 static int logLevel = 8;
  36
  37 /* localhost's name */
  38 static char localHostName[64];
  39
  40 #if ENABLE_FEATURE_ROTATE_LOGFILE
  41 /* max size of message file before being rotated */
  42 static unsigned logFileSize = 200 * 1024;
  43 /* number of rotated message files */
  44 static unsigned logFileRotate = 1;
  45 static unsigned curFileSize;
  46 static smallint isRegular;
  47 #endif
  48
  49 #if ENABLE_FEATURE_REMOTE_LOG
  50 #include <netinet/in.h>
  51 /* udp socket for logging to remote host */
  52 static int remoteFD = -1;
  53 static len_and_sockaddr* remoteAddr;
  54 #endif
  55
  56 /* We are using bb_common_bufsiz1 for buffering: */
  57 enum { MAX_READ = (BUFSIZ/6) & ~0xf };
  58 /* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
  59 #define RECVBUF  bb_common_bufsiz1
  60 /* ...then copy to PARSEBUF, escaping control chars */
  61 /* (can grow x2 max ~== BUFSIZ/3) */
  62 #define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
  63 /* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
  64  * host (64), fac.prio (20) to the message */
  65 /* (growth by: 15 + 64 + 20 + delims = ~110) */
  66 #define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
  67 /* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
  68  * -- we have BUFSIZ/6 extra at the ent of PRINTBUF
  69  * which covers needed ~110 extra bytes (and much more) */
  70
  71
  72 /* Options */
  73 enum {
  74         OPTBIT_mark = 0, // -m
  75         OPTBIT_nofork, // -n
  76         OPTBIT_outfile, // -O
  77         OPTBIT_loglevel, // -l
  78         OPTBIT_small, // -S
  79         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
  80         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
  81         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
  82         USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L
  83         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
  84
  85         OPT_mark        = 1 << OPTBIT_mark    ,
  86         OPT_nofork      = 1 << OPTBIT_nofork  ,
  87         OPT_outfile     = 1 << OPTBIT_outfile ,
  88         OPT_loglevel    = 1 << OPTBIT_loglevel,
  89         OPT_small       = 1 << OPTBIT_small   ,
  90         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
  91         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
  92         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
  93         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
  94         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
  95 };
  96 #define OPTION_STR "m:nO:l:S" \
  97         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
  98         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
  99         USE_FEATURE_REMOTE_LOG(    "R:" ) \
 100         USE_FEATURE_REMOTE_LOG(    "L"  ) \
 101         USE_FEATURE_IPC_SYSLOG(    "C::")
 102 #define OPTION_DECL *opt_m, *opt_l \
 103         USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
 104         USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
 105         USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
 106         USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
 107 #define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
 108         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 109         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 110         USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 111         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 112
 113
 114 /* circular buffer variables/structures */
 115 #if ENABLE_FEATURE_IPC_SYSLOG
 116
 117
 118 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 119 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 120 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 121 #endif
 122
 123 #include <sys/ipc.h>
 124 #include <sys/sem.h>
 125 #include <sys/shm.h>
 126
 127 /* our shared key */
 128 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 129
 130 // Semaphore operation structures
 131 static struct shbuf_ds {
 132         int32_t size;   // size of data written
 133         int32_t head;   // start of message list
 134         int32_t tail;   // end of message list
 135         char data[1];   // data/messages
 136 } *shbuf;               // shared memory pointer
 137
 138 static int shmid = -1;   // ipc shared memory id
 139 static int s_semid = -1; // ipc semaphore id
 140 static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);   // default shm size
 141
 142 static void ipcsyslog_cleanup(void)
 143 {
 144         if (shmid != -1) {
 145                 shmdt(shbuf);
 146         }
 147         if (shmid != -1) {
 148                 shmctl(shmid, IPC_RMID, NULL);
 149         }
 150         if (s_semid != -1) {
 151                 semctl(s_semid, 0, IPC_RMID, 0);
 152         }
 153 }
 154
 155 static void ipcsyslog_init(void)
 156 {
 157         if (DEBUG)
 158                 printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
 159
 160         shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
 161         if (shmid == -1) {
 162                 bb_perror_msg_and_die("shmget");
 163         }
 164
 165         shbuf = shmat(shmid, NULL, 0);
 166         if (!shbuf) {
 167                 bb_perror_msg_and_die("shmat");
 168         }
 169
 170         shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
 171         shbuf->head = shbuf->tail = 0;
 172
 173         // we'll trust the OS to set initial semval to 0 (let's hope)
 174         s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 175         if (s_semid == -1) {
 176                 if (errno == EEXIST) {
 177                         s_semid = semget(KEY_ID, 2, 0);
 178                         if (s_semid != -1)
 179                                 return;
 180                 }
 181                 bb_perror_msg_and_die("semget");
 182         }
 183 }
 184
 185 /* Write message to shared mem buffer */
 186 static void log_to_shmem(const char *msg, int len)
 187 {
 188         /* Why libc insists on these being rw? */
 189         static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
 190         static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
 191
 192         int old_tail, new_tail;
 193         char *c;
 194
 195         if (semop(s_semid, SMwdn, 3) == -1) {
 196                 bb_perror_msg_and_die("SMwdn");
 197         }
 198
 199         /* Circular Buffer Algorithm:
 200          * --------------------------
 201          * tail == position where to store next syslog message.
 202          * head == position of next message to retrieve ("print").
 203          * if head == tail, there is no "unprinted" messages left.
 204          * head is typically advanced by separate "reader" program,
 205          * but if there isn't one, we have to do it ourself.
 206          * messages are NUL-separated.
 207          */
 208         len++; /* length with NUL included */
 209  again:
 210         old_tail = shbuf->tail;
 211         new_tail = old_tail + len;
 212         if (new_tail < shbuf->size) {
 213                 /* No need to move head if shbuf->head <= old_tail,
 214                  * else... */
 215                 if (old_tail < shbuf->head && shbuf->head <= new_tail) {
 216                         /* ...need to move head forward */
 217                         c = memchr(shbuf->data + new_tail, '\0',
 218                                            shbuf->size - new_tail);
 219                         if (!c) /* no NUL ahead of us, wrap around */
 220                                 c = memchr(shbuf->data, '\0', old_tail);
 221                         if (!c) { /* still nothing? point to this msg... */
 222                                 shbuf->head = old_tail;
 223                         } else {
 224                                 /* convert pointer to offset + skip NUL */
 225                                 shbuf->head = c - shbuf->data + 1;
 226                         }
 227                 }
 228                 /* store message, set new tail */
 229                 memcpy(shbuf->data + old_tail, msg, len);
 230                 shbuf->tail = new_tail;
 231         } else {
 232                 /* we need to break up the message and wrap it around */
 233                 /* k == available buffer space ahead of old tail */
 234                 int k = shbuf->size - old_tail - 1;
 235                 if (shbuf->head > old_tail) {
 236                         /* we are going to overwrite head, need to
 237                          * move it out of the way */
 238                         c = memchr(shbuf->data, '\0', old_tail);
 239                         if (!c) { /* nothing? point to this msg... */
 240                                 shbuf->head = old_tail;
 241                         } else { /* convert pointer to offset + skip NUL */
 242                                 shbuf->head = c - shbuf->data + 1;
 243                         }
 244                 }
 245                 /* copy what fits to the end of buffer, and repeat */
 246                 memcpy(shbuf->data + old_tail, msg, k);
 247                 msg += k;
 248                 len -= k;
 249                 shbuf->tail = 0;
 250                 goto again;
 251         }
 252         if (semop(s_semid, SMwup, 1) == -1) {
 253                 bb_perror_msg_and_die("SMwup");
 254         }
 255         if (DEBUG)
 256                 printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
 257 }
 258 #else
 259 void ipcsyslog_cleanup(void);
 260 void ipcsyslog_init(void);
 261 void log_to_shmem(const char *msg);
 262 #endif /* FEATURE_IPC_SYSLOG */
 263
 264
 265 /* Print a message to the log file. */
 266 static void log_locally(char *msg)
 267 {
 268         static time_t last;
 269         struct flock fl;
 270         int len = strlen(msg);
 271
 272 #if ENABLE_FEATURE_IPC_SYSLOG
 273         if ((option_mask32 & OPT_circularlog) && shbuf) {
 274                 log_to_shmem(msg, len);
 275                 return;
 276         }
 277 #endif
 278         if (logFD >= 0) {
 279                 time_t cur;
 280                 time(&cur);
 281                 if (last != cur) {
 282                         last = cur; /* reopen log file every second */
 283                         close(logFD);
 284                         goto reopen;
 285                 }
 286         } else {
 287  reopen:
 288                 logFD = device_open(logFilePath, O_WRONLY | O_CREAT
 289                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 290                 if (logFD < 0) {
 291                         /* cannot open logfile? - print to /dev/console then */
 292                         int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 293                         if (fd < 0)
 294                                 fd = 2; /* then stderr, dammit */
 295                         full_write(fd, msg, len);
 296                         if (fd != 2)
 297                                 close(fd);
 298                         return;
 299                 }
 300 #if ENABLE_FEATURE_ROTATE_LOGFILE
 301                 {
 302                 struct stat statf;
 303
 304                 isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
 305                 /* bug (mostly harmless): can wrap around if file > 4gb */
 306                 curFileSize = statf.st_size;
 307                 }
 308 #endif
 309         }
 310
 311         fl.l_whence = SEEK_SET;
 312         fl.l_start = 0;
 313         fl.l_len = 1;
 314         fl.l_type = F_WRLCK;
 315         fcntl(logFD, F_SETLKW, &fl);
 316
 317 #if ENABLE_FEATURE_ROTATE_LOGFILE
 318         if (logFileSize && isRegular && curFileSize > logFileSize) {
 319                 if (logFileRotate) { /* always 0..99 */
 320                         int i = strlen(logFilePath) + 3 + 1;
 321                         char oldFile[i];
 322                         char newFile[i];
 323                         i = logFileRotate - 1;
 324                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 325                         while (1) {
 326                                 sprintf(newFile, "%s.%d", logFilePath, i);
 327                                 if (i == 0) break;
 328                                 sprintf(oldFile, "%s.%d", logFilePath, --i);
 329                                 rename(oldFile, newFile);
 330                         }
 331                         /* newFile == "f.0" now */
 332                         rename(logFilePath, newFile);
 333                         fl.l_type = F_UNLCK;
 334                         fcntl(logFD, F_SETLKW, &fl);
 335                         close(logFD);
 336                         goto reopen;
 337                 }
 338                 ftruncate(logFD, 0);
 339         }
 340         curFileSize +=
 341 #endif
 342                         full_write(logFD, msg, len);
 343         fl.l_type = F_UNLCK;
 344         fcntl(logFD, F_SETLKW, &fl);
 345 }
 346
 347 static void parse_fac_prio_20(int pri, char *res20)
 348 {
 349         CODE *c_pri, *c_fac;
 350
 351         if (pri != 0) {
 352                 c_fac = facilitynames;
 353                 while (c_fac->c_name) {
 354                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 355                                 c_fac++; continue;
 356                         }
 357                         /* facility is found, look for prio */
 358                         c_pri = prioritynames;
 359                         while (c_pri->c_name) {
 360                                 if (c_pri->c_val != LOG_PRI(pri)) {
 361                                         c_pri++; continue;
 362                                 }
 363                                 snprintf(res20, 20, "%s.%s",
 364                                                 c_fac->c_name, c_pri->c_name);
 365                                 return;
 366                         }
 367                         /* prio not found, bail out */
 368                         break;
 369                 }
 370                 snprintf(res20, 20, "<%d>", pri);
 371         }
 372 }
 373
 374 /* len parameter is used only for "is there a timestamp?" check.
 375  * NB: some callers cheat and supply 0 when they know
 376  * that there is no timestamp, short-cutting the test. */
 377 static void timestamp_and_log(int pri, char *msg, int len)
 378 {
 379         char *timestamp;
 380
 381         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 382          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 383         ) {
 384                 time_t now;
 385                 time(&now);
 386                 timestamp = ctime(&now) + 4;
 387         } else {
 388                 timestamp = msg;
 389                 msg += 16;
 390         }
 391         timestamp[15] = '\0';
 392
 393         /* Log message locally (to file or shared mem) */
 394         if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
 395                 if (LOG_PRI(pri) < logLevel) {
 396                         if (option_mask32 & OPT_small)
 397                                 sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
 398                         else {
 399                                 char res[20];
 400                                 parse_fac_prio_20(pri, res);
 401                                 sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
 402                         }
 403                         log_locally(PRINTBUF);
 404                 }
 405         }
 406 }
 407
 408 static void split_escape_and_log(char *tmpbuf, int len)
 409 {
 410         char *p = tmpbuf;
 411
 412         tmpbuf += len;
 413         while (p < tmpbuf) {
 414                 char c;
 415                 char *q = PARSEBUF;
 416                 int pri = (LOG_USER | LOG_NOTICE);
 417
 418                 if (*p == '<') {
 419                         /* Parse the magic priority number */
 420                         pri = bb_strtou(p + 1, &p, 10);
 421                         if (*p == '>') p++;
 422                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
 423                                 pri = (LOG_USER | LOG_NOTICE);
 424                         }
 425                 }
 426
 427                 while ((c = *p++)) {
 428                         if (c == '\n')
 429                                 c = ' ';
 430                         if (!(c & ~0x1f)) {
 431                                 *q++ = '^';
 432                                 c += '@'; /* ^@, ^A, ^B... */
 433                         }
 434                         *q++ = c;
 435                 }
 436                 *q = '\0';
 437                 /* Now log it */
 438                 timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
 439         }
 440 }
 441
 442 static void quit_signal(int sig)
 443 {
 444         timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
 445         puts("syslogd exiting");
 446         if (ENABLE_FEATURE_IPC_SYSLOG)
 447                 ipcsyslog_cleanup();
 448         exit(1);
 449 }
 450
 451 static void do_mark(int sig)
 452 {
 453         if (markInterval) {
 454                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
 455                 alarm(markInterval);
 456         }
 457 }
 458
 459 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 460 static void do_syslogd(void)
 461 {
 462         struct sockaddr_un sunx;
 463         int sock_fd;
 464         fd_set fds;
 465         char *dev_log_name;
 466
 467         /* Set up signal handlers */
 468         signal(SIGINT, quit_signal);
 469         signal(SIGTERM, quit_signal);
 470         signal(SIGQUIT, quit_signal);
 471         signal(SIGHUP, SIG_IGN);
 472         signal(SIGCHLD, SIG_IGN);
 473 #ifdef SIGCLD
 474         signal(SIGCLD, SIG_IGN);
 475 #endif
 476         signal(SIGALRM, do_mark);
 477         alarm(markInterval);
 478
 479         memset(&sunx, 0, sizeof(sunx));
 480         sunx.sun_family = AF_UNIX;
 481         strcpy(sunx.sun_path, "/dev/log");
 482
 483         /* Unlink old /dev/log or object it points to. */
 484         /* (if it exists, bind will fail) */
 485         logmode = LOGMODE_NONE;
 486         dev_log_name = xmalloc_readlink_or_warn("/dev/log");
 487         logmode = LOGMODE_STDIO;
 488         if (dev_log_name) {
 489                 int fd = xopen(".", O_NONBLOCK);
 490                 xchdir("/dev");
 491                 /* we do not check whether this is a link also */
 492                 unlink(dev_log_name);
 493                 fchdir(fd);
 494                 close(fd);
 495                 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 496                 free(dev_log_name);
 497         } else {
 498                 unlink("/dev/log");
 499         }
 500
 501         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 502         xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
 503
 504         if (chmod("/dev/log", 0666) < 0) {
 505                 bb_perror_msg_and_die("cannot set permission on /dev/log");
 506         }
 507         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 508                 ipcsyslog_init();
 509         }
 510
 511         timestamp_and_log(LOG_SYSLOG | LOG_INFO,
 512                         (char*)"syslogd started: BusyBox v" BB_VER, 0);
 513
 514         for (;;) {
 515                 FD_ZERO(&fds);
 516                 FD_SET(sock_fd, &fds);
 517
 518                 if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
 519                         if (errno == EINTR) {
 520                                 /* alarm may have happened */
 521                                 continue;
 522                         }
 523                         bb_perror_msg_and_die("select");
 524                 }
 525
 526                 if (FD_ISSET(sock_fd, &fds)) {
 527                         int i;
 528                         i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
 529                         if (i <= 0)
 530                                 bb_perror_msg_and_die("UNIX socket error");
 531                         /* TODO: maybe suppress duplicates? */
 532 #if ENABLE_FEATURE_REMOTE_LOG
 533                         /* We are not modifying log messages in any way before send */
 534                         /* Remote site cannot trust _us_ anyway and need to do validation again */
 535                         if (remoteAddr) {
 536                                 if (-1 == remoteFD) {
 537                                         remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
 538                                 }
 539                                 if (-1 != remoteFD) {
 540                                         /* send message to remote logger, ignore possible error */
 541                                         sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
 542                                                 &remoteAddr->sa, remoteAddr->len);
 543                                 }
 544                         }
 545 #endif
 546                         RECVBUF[i] = '\0';
 547                         split_escape_and_log(RECVBUF, i);
 548                 } /* FD_ISSET() */
 549         } /* for */
 550 }
 551
 552 int syslogd_main(int argc, char **argv);
 553 int syslogd_main(int argc, char **argv)
 554 {
 555         char OPTION_DECL;
 556         char *p;
 557
 558         /* do normal option parsing */
 559         opt_complementary = "=0"; /* no non-option params */
 560         getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
 561         if (option_mask32 & OPT_mark) // -m
 562                 markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 563         //if (option_mask32 & OPT_nofork) // -n
 564         //if (option_mask32 & OPT_outfile) // -O
 565         if (option_mask32 & OPT_loglevel) // -l
 566                 logLevel = xatou_range(opt_l, 1, 8);
 567         //if (option_mask32 & OPT_small) // -S
 568 #if ENABLE_FEATURE_ROTATE_LOGFILE
 569         if (option_mask32 & OPT_filesize) // -s
 570                 logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 571         if (option_mask32 & OPT_rotatecnt) // -b
 572                 logFileRotate = xatou_range(opt_b, 0, 99);
 573 #endif
 574 #if ENABLE_FEATURE_REMOTE_LOG
 575         if (option_mask32 & OPT_remotelog) { // -R
 576                 remoteAddr = xhost2sockaddr(opt_R, 514);
 577         }
 578         //if (option_mask32 & OPT_locallog) // -L
 579 #endif
 580 #if ENABLE_FEATURE_IPC_SYSLOG
 581         if (opt_C) // -Cn
 582                 shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 583 #endif
 584
 585         /* If they have not specified remote logging, then log locally */
 586         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 587                 option_mask32 |= OPT_locallog;
 588
 589         /* Store away localhost's name before the fork */
 590         gethostname(localHostName, sizeof(localHostName));
 591         p = strchr(localHostName, '.');
 592         if (p) {
 593                 *p = '\0';
 594         }
 595
 596         if (!(option_mask32 & OPT_nofork)) {
 597 #ifdef BB_NOMMU
 598                 vfork_daemon_rexec(0, 1, argc, argv, "-n");
 599 #else
 600                 bb_daemonize();
 601 #endif
 602         }
 603         umask(0);
 604         do_syslogd();
 605         /* return EXIT_SUCCESS; */
 606 }