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 /* We are using bb_common_bufsiz1 for buffering: */
  60 enum { MAX_READ = (BUFSIZ/6) & ~0xf };
  61 /* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
  62 #define RECVBUF  bb_common_bufsiz1
  63 /* ...then copy to PARSEBUF, escaping control chars */
  64 /* (can grow x2 max ~== BUFSIZ/3) */
  65 #define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
  66 /* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
  67  * host (64), fac.prio (20) to the message */
  68 /* (growth by: 15 + 64 + 20 + delims = ~110) */
  69 #define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
  70 /* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
  71  * -- we have BUFSIZ/6 extra at the ent of PRINTBUF
  72  * which covers needed ~110 extra bytes (and much more) */
  73
  74
  75 /* Options */
  76 enum {
  77         OPTBIT_mark = 0, // -m
  78         OPTBIT_nofork, // -n
  79         OPTBIT_outfile, // -O
  80         OPTBIT_loglevel, // -l
  81         OPTBIT_small, // -S
  82         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
  83         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
  84         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
  85         USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L
  86         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
  87
  88         OPT_mark        = 1 << OPTBIT_mark    ,
  89         OPT_nofork      = 1 << OPTBIT_nofork  ,
  90         OPT_outfile     = 1 << OPTBIT_outfile ,
  91         OPT_loglevel    = 1 << OPTBIT_loglevel,
  92         OPT_small       = 1 << OPTBIT_small   ,
  93         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
  94         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
  95         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
  96         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
  97         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
  98 };
  99 #define OPTION_STR "m:nO:l:S" \
 100         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
 101         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
 102         USE_FEATURE_REMOTE_LOG(    "R:" ) \
 103         USE_FEATURE_REMOTE_LOG(    "L"  ) \
 104         USE_FEATURE_IPC_SYSLOG(    "C::")
 105 #define OPTION_DECL *opt_m, *opt_l \
 106         USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
 107         USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
 108         USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
 109         USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
 110 #define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
 111         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 112         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 113         USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 114         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 115
 116
 117 /* circular buffer variables/structures */
 118 #if ENABLE_FEATURE_IPC_SYSLOG
 119
 120
 121 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 122 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 123 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 124 #endif
 125
 126 #include <sys/ipc.h>
 127 #include <sys/sem.h>
 128 #include <sys/shm.h>
 129
 130 /* our shared key */
 131 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 132
 133 // Semaphore operation structures
 134 static struct shbuf_ds {
 135         int32_t size;   // size of data written
 136         int32_t head;   // start of message list
 137         int32_t tail;   // end of message list
 138         char data[1];   // data/messages
 139 } *shbuf;               // shared memory pointer
 140
 141 static int shmid = -1;   // ipc shared memory id
 142 static int s_semid = -1; // ipc semaphore id
 143 static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);   // default shm size
 144
 145 static void ipcsyslog_cleanup(void)
 146 {
 147         if (shmid != -1) {
 148                 shmdt(shbuf);
 149         }
 150         if (shmid != -1) {
 151                 shmctl(shmid, IPC_RMID, NULL);
 152         }
 153         if (s_semid != -1) {
 154                 semctl(s_semid, 0, IPC_RMID, 0);
 155         }
 156 }
 157
 158 static void ipcsyslog_init(void)
 159 {
 160         if (DEBUG)
 161                 printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
 162
 163         shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
 164         if (shmid == -1) {
 165                 bb_perror_msg_and_die("shmget");
 166         }
 167
 168         shbuf = shmat(shmid, NULL, 0);
 169         if (!shbuf) {
 170                 bb_perror_msg_and_die("shmat");
 171         }
 172
 173         shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
 174         shbuf->head = shbuf->tail = 0;
 175
 176         // we'll trust the OS to set initial semval to 0 (let's hope)
 177         s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 178         if (s_semid == -1) {
 179                 if (errno == EEXIST) {
 180                         s_semid = semget(KEY_ID, 2, 0);
 181                         if (s_semid != -1)
 182                                 return;
 183                 }
 184                 bb_perror_msg_and_die("semget");
 185         }
 186 }
 187
 188 /* Write message to shared mem buffer */
 189 static void log_to_shmem(const char *msg, int len)
 190 {
 191         /* Why libc insists on these being rw? */
 192         static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
 193         static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
 194
 195         int old_tail, new_tail;
 196         char *c;
 197
 198         if (semop(s_semid, SMwdn, 3) == -1) {
 199                 bb_perror_msg_and_die("SMwdn");
 200         }
 201
 202         /* Circular Buffer Algorithm:
 203          * --------------------------
 204          * tail == position where to store next syslog message.
 205          * head == position of next message to retrieve ("print").
 206          * if head == tail, there is no "unprinted" messages left.
 207          * head is typically advanced by separate "reader" program,
 208          * but if there isn't one, we have to do it ourself.
 209          * messages are NUL-separated.
 210          */
 211         len++; /* length with NUL included */
 212  again:
 213         old_tail = shbuf->tail;
 214         new_tail = old_tail + len;
 215         if (new_tail < shbuf->size) {
 216                 /* No need to move head if shbuf->head <= old_tail,
 217                  * else... */
 218                 if (old_tail < shbuf->head && shbuf->head <= new_tail) {
 219                         /* ...need to move head forward */
 220                         c = memchr(shbuf->data + new_tail, '\0',
 221                                            shbuf->size - new_tail);
 222                         if (!c) /* no NUL ahead of us, wrap around */
 223                                 c = memchr(shbuf->data, '\0', old_tail);
 224                         if (!c) { /* still nothing? point to this msg... */
 225                                 shbuf->head = old_tail;
 226                         } else {
 227                                 /* convert pointer to offset + skip NUL */
 228                                 shbuf->head = c - shbuf->data + 1;
 229                         }
 230                 }
 231                 /* store message, set new tail */
 232                 memcpy(shbuf->data + old_tail, msg, len);
 233                 shbuf->tail = new_tail;
 234         } else {
 235                 /* we need to break up the message and wrap it around */
 236                 /* k == available buffer space ahead of old tail */
 237                 int k = shbuf->size - old_tail - 1;
 238                 if (shbuf->head > old_tail) {
 239                         /* we are going to overwrite head, need to
 240                          * move it out of the way */
 241                         c = memchr(shbuf->data, '\0', old_tail);
 242                         if (!c) { /* nothing? point to this msg... */
 243                                 shbuf->head = old_tail;
 244                         } else { /* convert pointer to offset + skip NUL */
 245                                 shbuf->head = c - shbuf->data + 1;
 246                         }
 247                 }
 248                 /* copy what fits to the end of buffer, and repeat */
 249                 memcpy(shbuf->data + old_tail, msg, k);
 250                 msg += k;
 251                 len -= k;
 252                 shbuf->tail = 0;
 253                 goto again;
 254         }
 255         if (semop(s_semid, SMwup, 1) == -1) {
 256                 bb_perror_msg_and_die("SMwup");
 257         }
 258         if (DEBUG)
 259                 printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
 260 }
 261 #else
 262 void ipcsyslog_cleanup(void);
 263 void ipcsyslog_init(void);
 264 void log_to_shmem(const char *msg);
 265
 266
 267 #endif /* FEATURE_IPC_SYSLOG */
 268
 269
 270 /* Print a message to the log file. */
 271 static void log_locally(char *msg)
 272 {
 273         static time_t last;
 274
 275         struct flock fl;
 276         int len = strlen(msg);
 277
 278 #if ENABLE_FEATURE_IPC_SYSLOG
 279         if ((option_mask32 & OPT_circularlog) && shbuf) {
 280                 log_to_shmem(msg, len);
 281                 return;
 282         }
 283 #endif
 284         if (logFD >= 0) {
 285                 time_t cur;
 286                 time(&cur);
 287                 if (last != cur) {
 288                         last = cur; /* reopen log file every second */
 289                         close(logFD);
 290                         goto reopen;
 291                 }
 292         } else {
 293  reopen:
 294                 logFD = device_open(logFilePath, O_WRONLY | O_CREAT
 295                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 296                 if (logFD < 0) {
 297                         /* cannot open logfile? - print to /dev/console then */
 298                         int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 299                         if (fd < 0)
 300                                 fd = 2; /* then stderr, dammit */
 301                         full_write(fd, msg, len);
 302                         if (fd != 2)
 303                                 close(fd);
 304                         return;
 305                 }
 306 #if ENABLE_FEATURE_ROTATE_LOGFILE
 307                 {
 308                 struct stat statf;
 309
 310                 isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
 311                 /* bug (mostly harmless): can wrap around if file > 4gb */
 312                 curFileSize = statf.st_size;
 313                 }
 314 #endif
 315         }
 316
 317         fl.l_whence = SEEK_SET;
 318         fl.l_start = 0;
 319         fl.l_len = 1;
 320         fl.l_type = F_WRLCK;
 321         fcntl(logFD, F_SETLKW, &fl);
 322
 323 #if ENABLE_FEATURE_ROTATE_LOGFILE
 324         if (logFileSize && isRegular && curFileSize > logFileSize) {
 325                 if (logFileRotate) { /* always 0..99 */
 326                         int i = strlen(logFilePath) + 3 + 1;
 327                         char oldFile[i];
 328                         char newFile[i];
 329                         i = logFileRotate - 1;
 330                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 331                         while (1) {
 332                                 sprintf(newFile, "%s.%d", logFilePath, i);
 333                                 if (i == 0) break;
 334                                 sprintf(oldFile, "%s.%d", logFilePath, --i);
 335                                 rename(oldFile, newFile);
 336                         }
 337                         /* newFile == "f.0" now */
 338                         rename(logFilePath, newFile);
 339                         fl.l_type = F_UNLCK;
 340                         fcntl(logFD, F_SETLKW, &fl);
 341                         close(logFD);
 342                         goto reopen;
 343                 }
 344                 ftruncate(logFD, 0);
 345         }
 346         curFileSize +=
 347 #endif
 348                         full_write(logFD, msg, len);
 349         fl.l_type = F_UNLCK;
 350         fcntl(logFD, F_SETLKW, &fl);
 351 }
 352
 353 static void parse_fac_prio_20(int pri, char *res20)
 354 {
 355         CODE *c_pri, *c_fac;
 356
 357         if (pri != 0) {
 358                 c_fac = facilitynames;
 359                 while (c_fac->c_name) {
 360                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 361                                 c_fac++; continue;
 362                         }
 363                         /* facility is found, look for prio */
 364                         c_pri = prioritynames;
 365                         while (c_pri->c_name) {
 366                                 if (c_pri->c_val != LOG_PRI(pri)) {
 367                                         c_pri++; continue;
 368                                 }
 369                                 snprintf(res20, 20, "%s.%s",
 370                                                 c_fac->c_name, c_pri->c_name);
 371                                 return;
 372                         }
 373                         /* prio not found, bail out */
 374                         break;
 375                 }
 376                 snprintf(res20, 20, "<%d>", pri);
 377         }
 378 }
 379
 380 /* len parameter is used only for "is there a timestamp?" check.
 381  * NB: some callers cheat and supply 0 when they know
 382  * that there is no timestamp, short-cutting the test. */
 383 static void timestamp_and_log(int pri, char *msg, int len)
 384 {
 385         char *timestamp;
 386
 387         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 388          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 389         ) {
 390                 time_t now;
 391                 time(&now);
 392                 timestamp = ctime(&now) + 4;
 393         } else {
 394                 timestamp = msg;
 395                 msg += 16;
 396         }
 397         timestamp[15] = '\0';
 398
 399         /* Log message locally (to file or shared mem) */
 400         if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
 401                 if (LOG_PRI(pri) < logLevel) {
 402                         if (option_mask32 & OPT_small)
 403                                 sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
 404                         else {
 405                                 char res[20];
 406                                 parse_fac_prio_20(pri, res);
 407                                 sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
 408                         }
 409                         log_locally(PRINTBUF);
 410                 }
 411         }
 412 }
 413
 414 static void split_escape_and_log(char *tmpbuf, int len)
 415 {
 416         char *p = tmpbuf;
 417
 418         tmpbuf += len;
 419         while (p < tmpbuf) {
 420                 char c;
 421                 char *q = PARSEBUF;
 422                 int pri = (LOG_USER | LOG_NOTICE);
 423
 424                 if (*p == '<') {
 425                         /* Parse the magic priority number */
 426                         pri = bb_strtou(p + 1, &p, 10);
 427                         if (*p == '>') p++;
 428                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
 429                                 pri = (LOG_USER | LOG_NOTICE);
 430                         }
 431                 }
 432
 433                 while ((c = *p++)) {
 434                         if (c == '\n')
 435                                 c = ' ';
 436                         if (!(c & ~0x1f)) {
 437                                 *q++ = '^';
 438                                 c += '@'; /* ^@, ^A, ^B... */
 439                         }
 440                         *q++ = c;
 441                 }
 442                 *q = '\0';
 443                 /* Now log it */
 444                 timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
 445         }
 446 }
 447
 448 static void quit_signal(int sig)
 449 {
 450         timestamp_and_log(LOG_SYSLOG | LOG_INFO, "System log daemon exiting", 0);
 451         puts("System log daemon exiting");
 452         unlink(dev_log_name);
 453         if (ENABLE_FEATURE_IPC_SYSLOG)
 454                 ipcsyslog_cleanup();
 455         exit(1);
 456 }
 457
 458 static void do_mark(int sig)
 459 {
 460         if (markInterval) {
 461                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, "-- MARK --", 0);
 462                 alarm(markInterval);
 463         }
 464 }
 465
 466 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 467 static void do_syslogd(void)
 468 {
 469         struct sockaddr_un sunx;
 470         socklen_t addrLength;
 471         int sock_fd;
 472         fd_set fds;
 473
 474         /* Set up signal handlers */
 475         signal(SIGINT, quit_signal);
 476         signal(SIGTERM, quit_signal);
 477         signal(SIGQUIT, quit_signal);
 478         signal(SIGHUP, SIG_IGN);
 479         signal(SIGCHLD, SIG_IGN);
 480 #ifdef SIGCLD
 481         signal(SIGCLD, SIG_IGN);
 482 #endif
 483         signal(SIGALRM, do_mark);
 484         alarm(markInterval);
 485
 486         dev_log_name = xmalloc_realpath(_PATH_LOG);
 487         if (!dev_log_name)
 488                 dev_log_name = _PATH_LOG;
 489
 490         /* Unlink old /dev/log (or object it points to) */
 491         unlink(dev_log_name);
 492
 493         memset(&sunx, 0, sizeof(sunx));
 494         sunx.sun_family = AF_UNIX;
 495         strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 496         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 497         addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
 498         xbind(sock_fd, (struct sockaddr *) &sunx, addrLength);
 499
 500         if (chmod(dev_log_name, 0666) < 0) {
 501                 bb_perror_msg_and_die("cannot set permission on %s", dev_log_name);
 502         }
 503         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 504                 ipcsyslog_init();
 505         }
 506
 507         timestamp_and_log(LOG_SYSLOG | LOG_INFO, "syslogd started: BusyBox v" BB_VER, 0);
 508
 509         for (;;) {
 510                 FD_ZERO(&fds);
 511                 FD_SET(sock_fd, &fds);
 512
 513                 if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
 514                         if (errno == EINTR) {
 515                                 /* alarm may have happened */
 516                                 continue;
 517                         }
 518                         bb_perror_msg_and_die("select");
 519                 }
 520
 521                 if (FD_ISSET(sock_fd, &fds)) {
 522                         int i;
 523                         i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
 524                         if (i <= 0)
 525                                 bb_perror_msg_and_die("UNIX socket error");
 526                         /* TODO: maybe suppress duplicates? */
 527 #if ENABLE_FEATURE_REMOTE_LOG
 528                         /* We are not modifying log messages in any way before send */
 529                         /* Remote site cannot trust _us_ anyway and need to do validation again */
 530                         if (option_mask32 & OPT_remotelog) {
 531                                 if (-1 == remoteFD) {
 532                                         remoteFD = socket(AF_INET, SOCK_DGRAM, 0);
 533                                 }
 534                                 if (-1 != remoteFD) {
 535                                         /* send message to remote logger, ignore possible error */
 536                                         sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
 537                                                 (struct sockaddr *) &remoteAddr,
 538                                                 sizeof(remoteAddr));
 539                                 }
 540                         }
 541 #endif
 542                         RECVBUF[i] = '\0';
 543                         split_escape_and_log(RECVBUF, i);
 544                 } /* FD_ISSET() */
 545         } /* for */
 546 }
 547
 548 int syslogd_main(int argc, char **argv)
 549 {
 550         char OPTION_DECL;
 551         char *p;
 552
 553         /* do normal option parsing */
 554         opt_complementary = "=0"; /* no non-option params */
 555         getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
 556         if (option_mask32 & OPT_mark) // -m
 557                 markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 558         //if (option_mask32 & OPT_nofork) // -n
 559         //if (option_mask32 & OPT_outfile) // -O
 560         if (option_mask32 & OPT_loglevel) // -l
 561                 logLevel = xatou_range(opt_l, 1, 8);
 562         //if (option_mask32 & OPT_small) // -S
 563 #if ENABLE_FEATURE_ROTATE_LOGFILE
 564         if (option_mask32 & OPT_filesize) // -s
 565                 logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 566         if (option_mask32 & OPT_rotatecnt) // -b
 567                 logFileRotate = xatou_range(opt_b, 0, 99);
 568 #endif
 569 #if ENABLE_FEATURE_REMOTE_LOG
 570         if (option_mask32 & OPT_remotelog) { // -R
 571                 int port = 514;
 572                 p = strchr(opt_R, ':');
 573                 if (p) {
 574                         *p++ = '\0';
 575                         port = xatou16(p);
 576                 }
 577                 remoteAddr.sin_family = AF_INET;
 578                 /* FIXME: looks ip4-specific. need to do better */
 579                 remoteAddr.sin_addr = *(struct in_addr *) *(xgethostbyname(opt_R)->h_addr_list);
 580                 remoteAddr.sin_port = htons(port);
 581         }
 582         //if (option_mask32 & OPT_locallog) // -L
 583 #endif
 584 #if ENABLE_FEATURE_IPC_SYSLOG
 585         if ((option_mask32 & OPT_circularlog) && opt_C) // -C
 586                 shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 587 #endif
 588
 589         /* If they have not specified remote logging, then log locally */
 590         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 591                 option_mask32 |= OPT_locallog;
 592
 593         /* Store away localhost's name before the fork */
 594         gethostname(localHostName, sizeof(localHostName));
 595         p = strchr(localHostName, '.');
 596         if (p) {
 597                 *p = '\0';
 598         }
 599
 600         if (!(option_mask32 & OPT_nofork)) {
 601 #ifdef BB_NOMMU
 602                 vfork_daemon_rexec(0, 1, argc, argv, "-n");
 603 #else
 604                 xdaemon(0, 1);
 605 #endif
 606         }
 607         umask(0);
 608         do_syslogd();
 609         /* return EXIT_SUCCESS; */
 610 }