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 "libbb.h"
  17 #include <paths.h>
  18 #include <sys/un.h>
  19
  20 /* SYSLOG_NAMES defined to pull prioritynames[] and facilitynames[]
  21  * from syslog.h. Grrrr - glibc puts those in _rwdata_! :( */
  22 #define SYSLOG_NAMES
  23 #define SYSLOG_NAMES_CONST /* uclibc is saner :) */
  24 #include <sys/syslog.h>
  25 #include <sys/uio.h>
  26
  27 #if ENABLE_FEATURE_REMOTE_LOG
  28 #include <netinet/in.h>
  29 #endif
  30
  31 #if ENABLE_FEATURE_IPC_SYSLOG
  32 #include <sys/ipc.h>
  33 #include <sys/sem.h>
  34 #include <sys/shm.h>
  35 #endif
  36
  37
  38 #define DEBUG 0
  39
  40 /* MARK code is not very useful, is bloat, and broken:
  41  * can deadlock if alarmed to make MARK while writing to IPC buffer
  42  * (semaphores are down but do_mark routine tries to down them again) */
  43 #undef SYSLOGD_MARK
  44
  45 enum {
  46         MAX_READ = 256,
  47         DNS_WAIT_SEC = 2 * 60,
  48 };
  49
  50 /* Semaphore operation structures */
  51 struct shbuf_ds {
  52         int32_t size;   /* size of data - 1 */
  53         int32_t tail;   /* end of message list */
  54         char data[1];   /* data/messages */
  55 };
  56
  57 /* Allows us to have smaller initializer. Ugly. */
  58 #define GLOBALS \
  59         const char *logFilePath;                \
  60         int logFD;                              \
  61         /* interval between marks in seconds */ \
  62         /*int markInterval;*/                   \
  63         /* level of messages to be logged */    \
  64         int logLevel;                           \
  65 USE_FEATURE_ROTATE_LOGFILE( \
  66         /* max size of file before rotation */  \
  67         unsigned logFileSize;                   \
  68         /* number of rotated message files */   \
  69         unsigned logFileRotate;                 \
  70         unsigned curFileSize;                   \
  71         smallint isRegular;                     \
  72 ) \
  73 USE_FEATURE_REMOTE_LOG( \
  74         /* udp socket for remote logging */     \
  75         int remoteFD;                           \
  76         len_and_sockaddr* remoteAddr;           \
  77 ) \
  78 USE_FEATURE_IPC_SYSLOG( \
  79         int shmid; /* ipc shared memory id */   \
  80         int s_semid; /* ipc semaphore id */     \
  81         int shm_size;                           \
  82         struct sembuf SMwup[1];                 \
  83         struct sembuf SMwdn[3];                 \
  84 )
  85
  86 struct init_globals {
  87         GLOBALS
  88 };
  89
  90 struct globals {
  91         GLOBALS
  92
  93 #if ENABLE_FEATURE_REMOTE_LOG
  94         unsigned last_dns_resolve;
  95         char *remoteAddrStr;
  96 #endif
  97
  98 #if ENABLE_FEATURE_IPC_SYSLOG
  99         struct shbuf_ds *shbuf;
 100 #endif
 101         time_t last_log_time;
 102         /* localhost's name */
 103         char localHostName[64];
 104
 105         /* We recv into recvbuf... */
 106         char recvbuf[MAX_READ];
 107         /* ...then copy to parsebuf, escaping control chars */
 108         /* (can grow x2 max) */
 109         char parsebuf[MAX_READ*2];
 110         /* ...then sprintf into printbuf, adding timestamp (15 chars),
 111          * host (64), fac.prio (20) to the message */
 112         /* (growth by: 15 + 64 + 20 + delims = ~110) */
 113         char printbuf[MAX_READ*2 + 128];
 114 };
 115
 116 static const struct init_globals init_data = {
 117         .logFilePath = "/var/log/messages",
 118         .logFD = -1,
 119 #ifdef SYSLOGD_MARK
 120         .markInterval = 20 * 60,
 121 #endif
 122         .logLevel = 8,
 123 #if ENABLE_FEATURE_ROTATE_LOGFILE
 124         .logFileSize = 200 * 1024,
 125         .logFileRotate = 1,
 126 #endif
 127 #if ENABLE_FEATURE_REMOTE_LOG
 128         .remoteFD = -1,
 129 #endif
 130 #if ENABLE_FEATURE_IPC_SYSLOG
 131         .shmid = -1,
 132         .s_semid = -1,
 133         .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
 134         .SMwup = { {1, -1, IPC_NOWAIT} },
 135         .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
 136 #endif
 137 };
 138
 139 #define G (*ptr_to_globals)
 140 #define INIT_G() do { \
 141         PTR_TO_GLOBALS = memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data)); \
 142 } while (0)
 143
 144
 145 /* Options */
 146 enum {
 147         OPTBIT_mark = 0, // -m
 148         OPTBIT_nofork, // -n
 149         OPTBIT_outfile, // -O
 150         OPTBIT_loglevel, // -l
 151         OPTBIT_small, // -S
 152         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
 153         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
 154         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
 155         USE_FEATURE_REMOTE_LOG(    OPTBIT_locallog   ,) // -L
 156         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
 157
 158         OPT_mark        = 1 << OPTBIT_mark    ,
 159         OPT_nofork      = 1 << OPTBIT_nofork  ,
 160         OPT_outfile     = 1 << OPTBIT_outfile ,
 161         OPT_loglevel    = 1 << OPTBIT_loglevel,
 162         OPT_small       = 1 << OPTBIT_small   ,
 163         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
 164         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
 165         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
 166         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_locallog   )) + 0,
 167         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
 168 };
 169 #define OPTION_STR "m:nO:l:S" \
 170         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
 171         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
 172         USE_FEATURE_REMOTE_LOG(    "R:" ) \
 173         USE_FEATURE_REMOTE_LOG(    "L"  ) \
 174         USE_FEATURE_IPC_SYSLOG(    "C::")
 175 #define OPTION_DECL *opt_m, *opt_l \
 176         USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
 177         USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
 178         USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
 179 #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
 180         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 181         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 182         USE_FEATURE_REMOTE_LOG(    ,&G.remoteAddrStr) \
 183         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 184
 185
 186 /* circular buffer variables/structures */
 187 #if ENABLE_FEATURE_IPC_SYSLOG
 188
 189 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 190 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 191 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 192 #endif
 193
 194 /* our shared key */
 195 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 196
 197 static void ipcsyslog_cleanup(void)
 198 {
 199         if (G.shmid != -1) {
 200                 shmdt(G.shbuf);
 201         }
 202         if (G.shmid != -1) {
 203                 shmctl(G.shmid, IPC_RMID, NULL);
 204         }
 205         if (G.s_semid != -1) {
 206                 semctl(G.s_semid, 0, IPC_RMID, 0);
 207         }
 208 }
 209
 210 static void ipcsyslog_init(void)
 211 {
 212         if (DEBUG)
 213                 printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
 214
 215         G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
 216         if (G.shmid == -1) {
 217                 bb_perror_msg_and_die("shmget");
 218         }
 219
 220         G.shbuf = shmat(G.shmid, NULL, 0);
 221         if (!G.shbuf) {
 222                 bb_perror_msg_and_die("shmat");
 223         }
 224
 225         memset(G.shbuf, 0, G.shm_size);
 226         G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
 227         /*G.shbuf->tail = 0;*/
 228
 229         // we'll trust the OS to set initial semval to 0 (let's hope)
 230         G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 231         if (G.s_semid == -1) {
 232                 if (errno == EEXIST) {
 233                         G.s_semid = semget(KEY_ID, 2, 0);
 234                         if (G.s_semid != -1)
 235                                 return;
 236                 }
 237                 bb_perror_msg_and_die("semget");
 238         }
 239 }
 240
 241 /* Write message to shared mem buffer */
 242 static void log_to_shmem(const char *msg, int len)
 243 {
 244         int old_tail, new_tail;
 245
 246         if (semop(G.s_semid, G.SMwdn, 3) == -1) {
 247                 bb_perror_msg_and_die("SMwdn");
 248         }
 249
 250         /* Circular Buffer Algorithm:
 251          * --------------------------
 252          * tail == position where to store next syslog message.
 253          * tail's max value is (shbuf->size - 1)
 254          * Last byte of buffer is never used and remains NUL.
 255          */
 256         len++; /* length with NUL included */
 257  again:
 258         old_tail = G.shbuf->tail;
 259         new_tail = old_tail + len;
 260         if (new_tail < G.shbuf->size) {
 261                 /* store message, set new tail */
 262                 memcpy(G.shbuf->data + old_tail, msg, len);
 263                 G.shbuf->tail = new_tail;
 264         } else {
 265                 /* k == available buffer space ahead of old tail */
 266                 int k = G.shbuf->size - old_tail;
 267                 /* copy what fits to the end of buffer, and repeat */
 268                 memcpy(G.shbuf->data + old_tail, msg, k);
 269                 msg += k;
 270                 len -= k;
 271                 G.shbuf->tail = 0;
 272                 goto again;
 273         }
 274         if (semop(G.s_semid, G.SMwup, 1) == -1) {
 275                 bb_perror_msg_and_die("SMwup");
 276         }
 277         if (DEBUG)
 278                 printf("tail:%d\n", G.shbuf->tail);
 279 }
 280 #else
 281 void ipcsyslog_cleanup(void);
 282 void ipcsyslog_init(void);
 283 void log_to_shmem(const char *msg);
 284 #endif /* FEATURE_IPC_SYSLOG */
 285
 286
 287 /* Print a message to the log file. */
 288 static void log_locally(char *msg)
 289 {
 290         struct flock fl;
 291         int len = strlen(msg);
 292
 293 #if ENABLE_FEATURE_IPC_SYSLOG
 294         if ((option_mask32 & OPT_circularlog) && G.shbuf) {
 295                 log_to_shmem(msg, len);
 296                 return;
 297         }
 298 #endif
 299         if (G.logFD >= 0) {
 300                 time_t cur;
 301                 time(&cur);
 302                 if (G.last_log_time != cur) {
 303                         G.last_log_time = cur; /* reopen log file every second */
 304                         close(G.logFD);
 305                         goto reopen;
 306                 }
 307         } else {
 308  reopen:
 309                 G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
 310                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 311                 if (G.logFD < 0) {
 312                         /* cannot open logfile? - print to /dev/console then */
 313                         int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 314                         if (fd < 0)
 315                                 fd = 2; /* then stderr, dammit */
 316                         full_write(fd, msg, len);
 317                         if (fd != 2)
 318                                 close(fd);
 319                         return;
 320                 }
 321 #if ENABLE_FEATURE_ROTATE_LOGFILE
 322                 {
 323                         struct stat statf;
 324                         G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode));
 325                         /* bug (mostly harmless): can wrap around if file > 4gb */
 326                         G.curFileSize = statf.st_size;
 327                 }
 328 #endif
 329         }
 330
 331         fl.l_whence = SEEK_SET;
 332         fl.l_start = 0;
 333         fl.l_len = 1;
 334         fl.l_type = F_WRLCK;
 335         fcntl(G.logFD, F_SETLKW, &fl);
 336
 337 #if ENABLE_FEATURE_ROTATE_LOGFILE
 338         if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
 339                 if (G.logFileRotate) { /* always 0..99 */
 340                         int i = strlen(G.logFilePath) + 3 + 1;
 341                         char oldFile[i];
 342                         char newFile[i];
 343                         i = G.logFileRotate - 1;
 344                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 345                         while (1) {
 346                                 sprintf(newFile, "%s.%d", G.logFilePath, i);
 347                                 if (i == 0) break;
 348                                 sprintf(oldFile, "%s.%d", G.logFilePath, --i);
 349                                 rename(oldFile, newFile);
 350                         }
 351                         /* newFile == "f.0" now */
 352                         rename(G.logFilePath, newFile);
 353                         fl.l_type = F_UNLCK;
 354                         fcntl(G.logFD, F_SETLKW, &fl);
 355                         close(G.logFD);
 356                         goto reopen;
 357                 }
 358                 ftruncate(G.logFD, 0);
 359         }
 360         G.curFileSize +=
 361 #endif
 362                         full_write(G.logFD, msg, len);
 363         fl.l_type = F_UNLCK;
 364         fcntl(G.logFD, F_SETLKW, &fl);
 365 }
 366
 367 static void parse_fac_prio_20(int pri, char *res20)
 368 {
 369         const CODE *c_pri, *c_fac;
 370
 371         if (pri != 0) {
 372                 c_fac = facilitynames;
 373                 while (c_fac->c_name) {
 374                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 375                                 c_fac++; continue;
 376                         }
 377                         /* facility is found, look for prio */
 378                         c_pri = prioritynames;
 379                         while (c_pri->c_name) {
 380                                 if (c_pri->c_val != LOG_PRI(pri)) {
 381                                         c_pri++; continue;
 382                                 }
 383                                 snprintf(res20, 20, "%s.%s",
 384                                                 c_fac->c_name, c_pri->c_name);
 385                                 return;
 386                         }
 387                         /* prio not found, bail out */
 388                         break;
 389                 }
 390                 snprintf(res20, 20, "<%d>", pri);
 391         }
 392 }
 393
 394 /* len parameter is used only for "is there a timestamp?" check.
 395  * NB: some callers cheat and supply len==0 when they know
 396  * that there is no timestamp, short-circuiting the test. */
 397 static void timestamp_and_log(int pri, char *msg, int len)
 398 {
 399         char *timestamp;
 400
 401         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
 402                 return;
 403
 404         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 405          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 406         ) {
 407                 time_t now;
 408                 time(&now);
 409                 timestamp = ctime(&now) + 4;
 410         } else {
 411                 timestamp = msg;
 412                 msg += 16;
 413         }
 414         timestamp[15] = '\0';
 415
 416         /* Log message locally (to file or shared mem) */
 417         if (option_mask32 & OPT_small)
 418                 sprintf(G.printbuf, "%s %s\n", timestamp, msg);
 419         else {
 420                 char res[20];
 421                 parse_fac_prio_20(pri, res);
 422                 sprintf(G.printbuf, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
 423         }
 424         log_locally(G.printbuf);
 425 }
 426
 427 static void split_escape_and_log(char *tmpbuf, int len)
 428 {
 429         char *p = tmpbuf;
 430
 431         tmpbuf += len;
 432         while (p < tmpbuf) {
 433                 char c;
 434                 char *q = G.parsebuf;
 435                 int pri = (LOG_USER | LOG_NOTICE);
 436
 437                 if (*p == '<') {
 438                         /* Parse the magic priority number */
 439                         pri = bb_strtou(p + 1, &p, 10);
 440                         if (*p == '>')
 441                                 p++;
 442                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
 443                                 pri = (LOG_USER | LOG_NOTICE);
 444                 }
 445
 446                 while ((c = *p++)) {
 447                         if (c == '\n')
 448                                 c = ' ';
 449                         if (!(c & ~0x1f) && c != '\t') {
 450                                 *q++ = '^';
 451                                 c += '@'; /* ^@, ^A, ^B... */
 452                         }
 453                         *q++ = c;
 454                 }
 455                 *q = '\0';
 456
 457                 /* Now log it */
 458                 if (LOG_PRI(pri) < G.logLevel)
 459                         timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
 460         }
 461 }
 462
 463 static void quit_signal(int sig)
 464 {
 465         timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
 466         puts("syslogd exiting");
 467         if (ENABLE_FEATURE_IPC_SYSLOG)
 468                 ipcsyslog_cleanup();
 469         exit(1);
 470 }
 471
 472 #ifdef SYSLOGD_MARK
 473 static void do_mark(int sig)
 474 {
 475         if (G.markInterval) {
 476                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
 477                 alarm(G.markInterval);
 478         }
 479 }
 480 #endif
 481
 482 /* Don't inline: prevent struct sockaddr_un to take up space on stack
 483  * permanently */
 484 static NOINLINE int create_socket(void)
 485 {
 486         struct sockaddr_un sunx;
 487         int sock_fd;
 488         char *dev_log_name;
 489
 490         memset(&sunx, 0, sizeof(sunx));
 491         sunx.sun_family = AF_UNIX;
 492
 493         /* Unlink old /dev/log or object it points to. */
 494         /* (if it exists, bind will fail) */
 495         strcpy(sunx.sun_path, "/dev/log");
 496         dev_log_name = xmalloc_follow_symlinks("/dev/log");
 497         if (dev_log_name) {
 498                 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 499                 free(dev_log_name);
 500         }
 501         unlink(sunx.sun_path);
 502
 503         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 504         xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
 505         chmod("/dev/log", 0666);
 506
 507         return sock_fd;
 508 }
 509
 510 #if ENABLE_FEATURE_REMOTE_LOG
 511 static int try_to_resolve_remote(void)
 512 {
 513         if (!G.remoteAddr) {
 514                 unsigned now = monotonic_sec();
 515
 516                 /* Don't resolve name too often - DNS timeouts can be big */
 517                 if ((now - G.last_dns_resolve) < DNS_WAIT_SEC)
 518                         return -1;
 519                 G.last_dns_resolve = now;
 520                 G.remoteAddr = host2sockaddr(G.remoteAddrStr, 514);
 521                 if (!G.remoteAddr)
 522                         return -1;
 523         }
 524         return socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
 525 }
 526 #endif
 527
 528 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 529 static void do_syslogd(void)
 530 {
 531         int sock_fd;
 532
 533         /* Set up signal handlers */
 534         signal(SIGINT, quit_signal);
 535         signal(SIGTERM, quit_signal);
 536         signal(SIGQUIT, quit_signal);
 537         signal(SIGHUP, SIG_IGN);
 538         /* signal(SIGCHLD, SIG_IGN); - why? */
 539 #ifdef SYSLOGD_MARK
 540         signal(SIGALRM, do_mark);
 541         alarm(G.markInterval);
 542 #endif
 543         sock_fd = create_socket();
 544
 545         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 546                 ipcsyslog_init();
 547         }
 548
 549         timestamp_and_log(LOG_SYSLOG | LOG_INFO,
 550                         (char*)"syslogd started: BusyBox v" BB_VER, 0);
 551
 552         for (;;) {
 553                 size_t sz;
 554  read_again:
 555                 sz = safe_read(sock_fd, G.recvbuf, MAX_READ - 1);
 556                 if (sz < 0) {
 557                         bb_perror_msg_and_die("read from /dev/log");
 558                 }
 559
 560                 /* Drop trailing NULs (typically there is one NUL) */
 561                 while (1) {
 562                         if (sz == 0)
 563                                 goto read_again;
 564                         /* man 3 syslog says: "A trailing newline is added when needed".
 565                          * However, neither glibc nor uclibc do this:
 566                          * syslog(prio, "test")   sends "test\0" to /dev/log,
 567                          * syslog(prio, "test\n") sends "test\n\0",
 568                          * IOW: newline is passed verbatim!
 569                          * I take it to mean that it's syslogd's job
 570                          * to make those look identical in the log files */
 571                         if (G.recvbuf[sz-1] && G.recvbuf[sz-1] != '\n')
 572                                 break;
 573                         sz--;
 574                 }
 575                 /* Maybe we need to add '\n' here, not later?
 576                  * It looks like stock syslogd does send '\n' over network,
 577                  * but we do not (see sendto below) */
 578                 G.recvbuf[sz] = '\0'; /* make sure it *is* NUL terminated */
 579
 580                 /* TODO: maybe suppress duplicates? */
 581 #if ENABLE_FEATURE_REMOTE_LOG
 582                 /* We are not modifying log messages in any way before send */
 583                 /* Remote site cannot trust _us_ anyway and need to do validation again */
 584                 if (G.remoteAddrStr) {
 585                         if (-1 == G.remoteFD) {
 586                                 G.remoteFD = try_to_resolve_remote();
 587                                 if (-1 == G.remoteFD)
 588                                         goto no_luck;
 589                         }
 590                         /* send message to remote logger, ignore possible error */
 591                         sendto(G.remoteFD, G.recvbuf, sz, MSG_DONTWAIT,
 592                                     &G.remoteAddr->sa, G.remoteAddr->len);
 593  no_luck: ;
 594                 }
 595 #endif
 596                 if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog))
 597                         split_escape_and_log(G.recvbuf, sz);
 598         } /* for (;;) */
 599 }
 600
 601 int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 602 int syslogd_main(int argc, char **argv)
 603 {
 604         char OPTION_DECL;
 605         char *p;
 606
 607         INIT_G();
 608 #if ENABLE_FEATURE_REMOTE_LOG
 609         G.last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
 610 #endif
 611
 612         /* do normal option parsing */
 613         opt_complementary = "=0"; /* no non-option params */
 614         getopt32(argv, OPTION_STR, OPTION_PARAM);
 615 #ifdef SYSLOGD_MARK
 616         if (option_mask32 & OPT_mark) // -m
 617                 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 618 #endif
 619         //if (option_mask32 & OPT_nofork) // -n
 620         //if (option_mask32 & OPT_outfile) // -O
 621         if (option_mask32 & OPT_loglevel) // -l
 622                 G.logLevel = xatou_range(opt_l, 1, 8);
 623         //if (option_mask32 & OPT_small) // -S
 624 #if ENABLE_FEATURE_ROTATE_LOGFILE
 625         if (option_mask32 & OPT_filesize) // -s
 626                 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 627         if (option_mask32 & OPT_rotatecnt) // -b
 628                 G.logFileRotate = xatou_range(opt_b, 0, 99);
 629 #endif
 630 #if ENABLE_FEATURE_IPC_SYSLOG
 631         if (opt_C) // -Cn
 632                 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 633 #endif
 634
 635         /* If they have not specified remote logging, then log locally */
 636         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 637                 option_mask32 |= OPT_locallog;
 638
 639         /* Store away localhost's name before the fork */
 640         gethostname(G.localHostName, sizeof(G.localHostName));
 641         p = strchr(G.localHostName, '.');
 642         if (p) {
 643                 *p = '\0';
 644         }
 645
 646         if (!(option_mask32 & OPT_nofork)) {
 647                 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
 648         }
 649         umask(0);
 650         write_pidfile("/var/run/syslogd.pid");
 651         do_syslogd();
 652         /* return EXIT_SUCCESS; */
 653 }