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 /* This is not very useful, is bloat, and broken:
  32  * can deadlock if alarmed to make MARK while writing to IPC buffer
  33  * (semaphores are down but do_mark routine tries to down them again) */
  34 #ifdef SYSLOGD_MARK
  35 /* interval between marks in seconds */
  36 static int markInterval = 20 * 60;
  37 #endif
  38
  39 /* level of messages to be locally logged */
  40 static int logLevel = 8;
  41
  42 /* localhost's name */
  43 static char localHostName[64];
  44
  45 #if ENABLE_FEATURE_ROTATE_LOGFILE
  46 /* max size of message file before being rotated */
  47 static unsigned logFileSize = 200 * 1024;
  48 /* number of rotated message files */
  49 static unsigned logFileRotate = 1;
  50 static unsigned curFileSize;
  51 static smallint isRegular;
  52 #endif
  53
  54 #if ENABLE_FEATURE_REMOTE_LOG
  55 #include <netinet/in.h>
  56 /* udp socket for logging to remote host */
  57 static int remoteFD = -1;
  58 static len_and_sockaddr* remoteAddr;
  59 #endif
  60
  61 /* We are using bb_common_bufsiz1 for buffering: */
  62 enum { MAX_READ = (BUFSIZ/6) & ~0xf };
  63 /* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
  64 #define RECVBUF  bb_common_bufsiz1
  65 /* ...then copy to PARSEBUF, escaping control chars */
  66 /* (can grow x2 max ~== BUFSIZ/3) */
  67 #define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
  68 /* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
  69  * host (64), fac.prio (20) to the message */
  70 /* (growth by: 15 + 64 + 20 + delims = ~110) */
  71 #define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
  72 /* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
  73  * -- we have BUFSIZ/6 extra at the ent of PRINTBUF
  74  * which covers needed ~110 extra bytes (and much more) */
  75
  76
  77 /* Options */
  78 enum {
  79         OPTBIT_mark = 0, // -m
  80         OPTBIT_nofork, // -n
  81         OPTBIT_outfile, // -O
  82         OPTBIT_loglevel, // -l
  83         OPTBIT_small, // -S
  84         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
  85         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
  86         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
  87         USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L
  88         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
  89
  90         OPT_mark        = 1 << OPTBIT_mark    ,
  91         OPT_nofork      = 1 << OPTBIT_nofork  ,
  92         OPT_outfile     = 1 << OPTBIT_outfile ,
  93         OPT_loglevel    = 1 << OPTBIT_loglevel,
  94         OPT_small       = 1 << OPTBIT_small   ,
  95         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
  96         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
  97         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
  98         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
  99         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
 100 };
 101 #define OPTION_STR "m:nO:l:S" \
 102         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
 103         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
 104         USE_FEATURE_REMOTE_LOG(    "R:" ) \
 105         USE_FEATURE_REMOTE_LOG(    "L"  ) \
 106         USE_FEATURE_IPC_SYSLOG(    "C::")
 107 #define OPTION_DECL *opt_m, *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 = NULL)
 112 #define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
 113         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 114         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 115         USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 116         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 117
 118
 119 /* circular buffer variables/structures */
 120 #if ENABLE_FEATURE_IPC_SYSLOG
 121
 122
 123 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 124 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 125 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 126 #endif
 127
 128 #include <sys/ipc.h>
 129 #include <sys/sem.h>
 130 #include <sys/shm.h>
 131
 132 /* our shared key */
 133 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 134
 135 // Semaphore operation structures
 136 static struct shbuf_ds {
 137         int32_t size;   // size of data written
 138         int32_t head;   // start of message list
 139         int32_t tail;   // end of message list
 140         char data[1];   // data/messages
 141 } *shbuf;               // shared memory pointer
 142
 143 static int shmid = -1;   // ipc shared memory id
 144 static int s_semid = -1; // ipc semaphore id
 145 static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024);   // default shm size
 146
 147 static void ipcsyslog_cleanup(void)
 148 {
 149         if (shmid != -1) {
 150                 shmdt(shbuf);
 151         }
 152         if (shmid != -1) {
 153                 shmctl(shmid, IPC_RMID, NULL);
 154         }
 155         if (s_semid != -1) {
 156                 semctl(s_semid, 0, IPC_RMID, 0);
 157         }
 158 }
 159
 160 static void ipcsyslog_init(void)
 161 {
 162         if (DEBUG)
 163                 printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
 164
 165         shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
 166         if (shmid == -1) {
 167                 bb_perror_msg_and_die("shmget");
 168         }
 169
 170         shbuf = shmat(shmid, NULL, 0);
 171         if (!shbuf) {
 172                 bb_perror_msg_and_die("shmat");
 173         }
 174
 175         shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
 176         shbuf->head = shbuf->tail = 0;
 177
 178         // we'll trust the OS to set initial semval to 0 (let's hope)
 179         s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 180         if (s_semid == -1) {
 181                 if (errno == EEXIST) {
 182                         s_semid = semget(KEY_ID, 2, 0);
 183                         if (s_semid != -1)
 184                                 return;
 185                 }
 186                 bb_perror_msg_and_die("semget");
 187         }
 188 }
 189
 190 /* Write message to shared mem buffer */
 191 static void log_to_shmem(const char *msg, int len)
 192 {
 193         /* Why libc insists on these being rw? */
 194         static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
 195         static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
 196
 197         int old_tail, new_tail;
 198         char *c;
 199
 200         if (semop(s_semid, SMwdn, 3) == -1) {
 201                 bb_perror_msg_and_die("SMwdn");
 202         }
 203
 204         /* Circular Buffer Algorithm:
 205          * --------------------------
 206          * tail == position where to store next syslog message.
 207          * head == position of next message to retrieve ("print").
 208          * if head == tail, there is no "unprinted" messages left.
 209          * head is typically advanced by separate "reader" program,
 210          * but if there isn't one, we have to do it ourself.
 211          * messages are NUL-separated.
 212          */
 213         len++; /* length with NUL included */
 214  again:
 215         old_tail = shbuf->tail;
 216         new_tail = old_tail + len;
 217         if (new_tail < shbuf->size) {
 218                 /* No need to move head if shbuf->head <= old_tail,
 219                  * else... */
 220                 if (old_tail < shbuf->head && shbuf->head <= new_tail) {
 221                         /* ...need to move head forward */
 222                         c = memchr(shbuf->data + new_tail, '\0',
 223                                            shbuf->size - new_tail);
 224                         if (!c) /* no NUL ahead of us, wrap around */
 225                                 c = memchr(shbuf->data, '\0', old_tail);
 226                         if (!c) { /* still nothing? point to this msg... */
 227                                 shbuf->head = old_tail;
 228                         } else {
 229                                 /* convert pointer to offset + skip NUL */
 230                                 shbuf->head = c - shbuf->data + 1;
 231                         }
 232                 }
 233                 /* store message, set new tail */
 234                 memcpy(shbuf->data + old_tail, msg, len);
 235                 shbuf->tail = new_tail;
 236         } else {
 237                 /* we need to break up the message and wrap it around */
 238                 /* k == available buffer space ahead of old tail */
 239                 int k = shbuf->size - old_tail - 1;
 240                 if (shbuf->head > old_tail) {
 241                         /* we are going to overwrite head, need to
 242                          * move it out of the way */
 243                         c = memchr(shbuf->data, '\0', old_tail);
 244                         if (!c) { /* nothing? point to this msg... */
 245                                 shbuf->head = old_tail;
 246                         } else { /* convert pointer to offset + skip NUL */
 247                                 shbuf->head = c - shbuf->data + 1;
 248                         }
 249                 }
 250                 /* copy what fits to the end of buffer, and repeat */
 251                 memcpy(shbuf->data + old_tail, msg, k);
 252                 msg += k;
 253                 len -= k;
 254                 shbuf->tail = 0;
 255                 goto again;
 256         }
 257         if (semop(s_semid, SMwup, 1) == -1) {
 258                 bb_perror_msg_and_die("SMwup");
 259         }
 260         if (DEBUG)
 261                 printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
 262 }
 263 #else
 264 void ipcsyslog_cleanup(void);
 265 void ipcsyslog_init(void);
 266 void log_to_shmem(const char *msg);
 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         struct flock fl;
 275         int len = strlen(msg);
 276
 277 #if ENABLE_FEATURE_IPC_SYSLOG
 278         if ((option_mask32 & OPT_circularlog) && shbuf) {
 279                 log_to_shmem(msg, len);
 280                 return;
 281         }
 282 #endif
 283         if (logFD >= 0) {
 284                 time_t cur;
 285                 time(&cur);
 286                 if (last != cur) {
 287                         last = cur; /* reopen log file every second */
 288                         close(logFD);
 289                         goto reopen;
 290                 }
 291         } else {
 292  reopen:
 293                 logFD = device_open(logFilePath, O_WRONLY | O_CREAT
 294                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 295                 if (logFD < 0) {
 296                         /* cannot open logfile? - print to /dev/console then */
 297                         int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 298                         if (fd < 0)
 299                                 fd = 2; /* then stderr, dammit */
 300                         full_write(fd, msg, len);
 301                         if (fd != 2)
 302                                 close(fd);
 303                         return;
 304                 }
 305 #if ENABLE_FEATURE_ROTATE_LOGFILE
 306                 {
 307                 struct stat statf;
 308
 309                 isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
 310                 /* bug (mostly harmless): can wrap around if file > 4gb */
 311                 curFileSize = statf.st_size;
 312                 }
 313 #endif
 314         }
 315
 316         fl.l_whence = SEEK_SET;
 317         fl.l_start = 0;
 318         fl.l_len = 1;
 319         fl.l_type = F_WRLCK;
 320         fcntl(logFD, F_SETLKW, &fl);
 321
 322 #if ENABLE_FEATURE_ROTATE_LOGFILE
 323         if (logFileSize && isRegular && curFileSize > logFileSize) {
 324                 if (logFileRotate) { /* always 0..99 */
 325                         int i = strlen(logFilePath) + 3 + 1;
 326                         char oldFile[i];
 327                         char newFile[i];
 328                         i = logFileRotate - 1;
 329                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 330                         while (1) {
 331                                 sprintf(newFile, "%s.%d", logFilePath, i);
 332                                 if (i == 0) break;
 333                                 sprintf(oldFile, "%s.%d", logFilePath, --i);
 334                                 rename(oldFile, newFile);
 335                         }
 336                         /* newFile == "f.0" now */
 337                         rename(logFilePath, newFile);
 338                         fl.l_type = F_UNLCK;
 339                         fcntl(logFD, F_SETLKW, &fl);
 340                         close(logFD);
 341                         goto reopen;
 342                 }
 343                 ftruncate(logFD, 0);
 344         }
 345         curFileSize +=
 346 #endif
 347                         full_write(logFD, msg, len);
 348         fl.l_type = F_UNLCK;
 349         fcntl(logFD, F_SETLKW, &fl);
 350 }
 351
 352 static void parse_fac_prio_20(int pri, char *res20)
 353 {
 354         CODE *c_pri, *c_fac;
 355
 356         if (pri != 0) {
 357                 c_fac = facilitynames;
 358                 while (c_fac->c_name) {
 359                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 360                                 c_fac++; continue;
 361                         }
 362                         /* facility is found, look for prio */
 363                         c_pri = prioritynames;
 364                         while (c_pri->c_name) {
 365                                 if (c_pri->c_val != LOG_PRI(pri)) {
 366                                         c_pri++; continue;
 367                                 }
 368                                 snprintf(res20, 20, "%s.%s",
 369                                                 c_fac->c_name, c_pri->c_name);
 370                                 return;
 371                         }
 372                         /* prio not found, bail out */
 373                         break;
 374                 }
 375                 snprintf(res20, 20, "<%d>", pri);
 376         }
 377 }
 378
 379 /* len parameter is used only for "is there a timestamp?" check.
 380  * NB: some callers cheat and supply 0 when they know
 381  * that there is no timestamp, short-cutting the test. */
 382 static void timestamp_and_log(int pri, char *msg, int len)
 383 {
 384         char *timestamp;
 385
 386         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 387          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 388         ) {
 389                 time_t now;
 390                 time(&now);
 391                 timestamp = ctime(&now) + 4;
 392         } else {
 393                 timestamp = msg;
 394                 msg += 16;
 395         }
 396         timestamp[15] = '\0';
 397
 398         /* Log message locally (to file or shared mem) */
 399         if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
 400                 if (LOG_PRI(pri) < logLevel) {
 401                         if (option_mask32 & OPT_small)
 402                                 sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
 403                         else {
 404                                 char res[20];
 405                                 parse_fac_prio_20(pri, res);
 406                                 sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
 407                         }
 408                         log_locally(PRINTBUF);
 409                 }
 410         }
 411 }
 412
 413 static void split_escape_and_log(char *tmpbuf, int len)
 414 {
 415         char *p = tmpbuf;
 416
 417         tmpbuf += len;
 418         while (p < tmpbuf) {
 419                 char c;
 420                 char *q = PARSEBUF;
 421                 int pri = (LOG_USER | LOG_NOTICE);
 422
 423                 if (*p == '<') {
 424                         /* Parse the magic priority number */
 425                         pri = bb_strtou(p + 1, &p, 10);
 426                         if (*p == '>') p++;
 427                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
 428                                 pri = (LOG_USER | LOG_NOTICE);
 429                         }
 430                 }
 431
 432                 while ((c = *p++)) {
 433                         if (c == '\n')
 434                                 c = ' ';
 435                         if (!(c & ~0x1f)) {
 436                                 *q++ = '^';
 437                                 c += '@'; /* ^@, ^A, ^B... */
 438                         }
 439                         *q++ = c;
 440                 }
 441                 *q = '\0';
 442                 /* Now log it */
 443                 timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
 444         }
 445 }
 446
 447 static void quit_signal(int sig)
 448 {
 449         timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
 450         puts("syslogd exiting");
 451         if (ENABLE_FEATURE_IPC_SYSLOG)
 452                 ipcsyslog_cleanup();
 453         exit(1);
 454 }
 455
 456 #ifdef SYSLOGD_MARK
 457 static void do_mark(int sig)
 458 {
 459         if (markInterval) {
 460                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
 461                 alarm(markInterval);
 462         }
 463 }
 464 #endif
 465
 466 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 467 static void do_syslogd(void)
 468 {
 469         struct sockaddr_un sunx;
 470         int sock_fd;
 471         fd_set fds;
 472         char *dev_log_name;
 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 #ifdef SYSLOGD_MARK
 484         signal(SIGALRM, do_mark);
 485         alarm(markInterval);
 486 #endif
 487
 488         memset(&sunx, 0, sizeof(sunx));
 489         sunx.sun_family = AF_UNIX;
 490         strcpy(sunx.sun_path, "/dev/log");
 491
 492         /* Unlink old /dev/log or object it points to. */
 493         /* (if it exists, bind will fail) */
 494         logmode = LOGMODE_NONE;
 495         dev_log_name = xmalloc_readlink_or_warn("/dev/log");
 496         logmode = LOGMODE_STDIO;
 497         if (dev_log_name) {
 498                 int fd = xopen(".", O_NONBLOCK);
 499                 xchdir("/dev");
 500                 /* we do not check whether this is a link also */
 501                 unlink(dev_log_name);
 502                 fchdir(fd);
 503                 close(fd);
 504                 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 505                 free(dev_log_name);
 506         } else {
 507                 unlink("/dev/log");
 508         }
 509
 510         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 511         xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
 512
 513         if (chmod("/dev/log", 0666) < 0) {
 514                 bb_perror_msg_and_die("cannot set permission on /dev/log");
 515         }
 516         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 517                 ipcsyslog_init();
 518         }
 519
 520         timestamp_and_log(LOG_SYSLOG | LOG_INFO,
 521                         (char*)"syslogd started: BusyBox v" BB_VER, 0);
 522
 523         for (;;) {
 524                 FD_ZERO(&fds);
 525                 FD_SET(sock_fd, &fds);
 526
 527                 if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
 528                         if (errno == EINTR) {
 529                                 /* alarm may have happened */
 530                                 continue;
 531                         }
 532                         bb_perror_msg_and_die("select");
 533                 }
 534
 535                 if (FD_ISSET(sock_fd, &fds)) {
 536                         int i;
 537                         i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
 538                         if (i <= 0)
 539                                 bb_perror_msg_and_die("UNIX socket error");
 540                         /* TODO: maybe suppress duplicates? */
 541 #if ENABLE_FEATURE_REMOTE_LOG
 542                         /* We are not modifying log messages in any way before send */
 543                         /* Remote site cannot trust _us_ anyway and need to do validation again */
 544                         if (remoteAddr) {
 545                                 if (-1 == remoteFD) {
 546                                         remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
 547                                 }
 548                                 if (-1 != remoteFD) {
 549                                         /* send message to remote logger, ignore possible error */
 550                                         sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
 551                                                 &remoteAddr->sa, remoteAddr->len);
 552                                 }
 553                         }
 554 #endif
 555                         RECVBUF[i] = '\0';
 556                         split_escape_and_log(RECVBUF, i);
 557                 } /* FD_ISSET() */
 558         } /* for */
 559 }
 560
 561 int syslogd_main(int argc, char **argv);
 562 int syslogd_main(int argc, char **argv)
 563 {
 564         char OPTION_DECL;
 565         char *p;
 566
 567         /* do normal option parsing */
 568         opt_complementary = "=0"; /* no non-option params */
 569         getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
 570 #ifdef SYSLOGD_MARK
 571         if (option_mask32 & OPT_mark) // -m
 572                 markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 573 #endif
 574         //if (option_mask32 & OPT_nofork) // -n
 575         //if (option_mask32 & OPT_outfile) // -O
 576         if (option_mask32 & OPT_loglevel) // -l
 577                 logLevel = xatou_range(opt_l, 1, 8);
 578         //if (option_mask32 & OPT_small) // -S
 579 #if ENABLE_FEATURE_ROTATE_LOGFILE
 580         if (option_mask32 & OPT_filesize) // -s
 581                 logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 582         if (option_mask32 & OPT_rotatecnt) // -b
 583                 logFileRotate = xatou_range(opt_b, 0, 99);
 584 #endif
 585 #if ENABLE_FEATURE_REMOTE_LOG
 586         if (option_mask32 & OPT_remotelog) { // -R
 587                 remoteAddr = xhost2sockaddr(opt_R, 514);
 588         }
 589         //if (option_mask32 & OPT_locallog) // -L
 590 #endif
 591 #if ENABLE_FEATURE_IPC_SYSLOG
 592         if (opt_C) // -Cn
 593                 shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 594 #endif
 595
 596         /* If they have not specified remote logging, then log locally */
 597         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 598                 option_mask32 |= OPT_locallog;
 599
 600         /* Store away localhost's name before the fork */
 601         gethostname(localHostName, sizeof(localHostName));
 602         p = strchr(localHostName, '.');
 603         if (p) {
 604                 *p = '\0';
 605         }
 606
 607         if (!(option_mask32 & OPT_nofork)) {
 608 #ifdef BB_NOMMU
 609                 vfork_daemon_rexec(0, 1, argc, argv, "-n");
 610 #else
 611                 bb_daemonize();
 612 #endif
 613         }
 614         umask(0);
 615         do_syslogd();
 616         /* return EXIT_SUCCESS; */
 617 }