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 /* prioritynames[] and facilitynames[]. uclibc pulls those in _rwdata_! :( */
  22
  23 #define SYSLOG_NAMES
  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 // Semaphore operation structures
  41 struct shbuf_ds {
  42         int32_t size;   // size of data written
  43         int32_t head;   // start of message list
  44         int32_t tail;   // end of message list
  45         char data[1];   // data/messages
  46 };                      // shared memory pointer
  47
  48 struct globals {
  49
  50         const char *logFilePath;
  51         int logFD;
  52
  53         /* This is not very useful, is bloat, and broken:
  54          * can deadlock if alarmed to make MARK while writing to IPC buffer
  55          * (semaphores are down but do_mark routine tries to down them again) */
  56 #ifdef SYSLOGD_MARK
  57         /* interval between marks in seconds */
  58         int markInterval;
  59 #endif
  60
  61         /* level of messages to be locally logged */
  62         int logLevel;
  63
  64 #if ENABLE_FEATURE_ROTATE_LOGFILE
  65         /* max size of message file before being rotated */
  66         unsigned logFileSize;
  67         /* number of rotated message files */
  68         unsigned logFileRotate;
  69         unsigned curFileSize;
  70         smallint isRegular;
  71 #endif
  72
  73 #if ENABLE_FEATURE_REMOTE_LOG
  74         /* udp socket for logging to remote host */
  75         int remoteFD;
  76         len_and_sockaddr* remoteAddr;
  77 #endif
  78
  79 #if ENABLE_FEATURE_IPC_SYSLOG
  80         int shmid; // ipc shared memory id
  81         int s_semid; // ipc semaphore id
  82         int shm_size;
  83         struct sembuf SMwup[1];
  84         struct sembuf SMwdn[3];
  85         struct shbuf_ds *shbuf;
  86 #endif
  87
  88         time_t last_log_time;
  89         /* localhost's name */
  90         char localHostName[64];
  91
  92 }; /* struct globals */
  93
  94 static const struct globals init_globals = {
  95         .logFilePath = "/var/log/messages",
  96         .logFD = -1,
  97 #ifdef SYSLOGD_MARK
  98         .markInterval = 20 * 60,
  99 #endif
 100         .logLevel = 8,
 101 #if ENABLE_FEATURE_ROTATE_LOGFILE
 102         .logFileSize = 200 * 1024,
 103         .logFileRotate = 1,
 104 #endif
 105 #if ENABLE_FEATURE_REMOTE_LOG
 106         .remoteFD = -1,
 107 #endif
 108 #if ENABLE_FEATURE_IPC_SYSLOG
 109         .shmid = -1,
 110         .s_semid = -1,
 111         .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
 112         .SMwup = { {1, -1, IPC_NOWAIT} },
 113         .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
 114 #endif
 115         // FIXME: hidden tail with lotsa zeroes is here....
 116 };
 117
 118 #define G (*ptr_to_globals)
 119
 120
 121 /* We are using bb_common_bufsiz1 for buffering: */
 122 enum { MAX_READ = (BUFSIZ/6) & ~0xf };
 123 /* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
 124 #define RECVBUF  bb_common_bufsiz1
 125 /* ...then copy to PARSEBUF, escaping control chars */
 126 /* (can grow x2 max ~== BUFSIZ/3) */
 127 #define PARSEBUF (bb_common_bufsiz1 + MAX_READ)
 128 /* ...then sprintf into PRINTBUF, adding timestamp (15 chars),
 129  * host (64), fac.prio (20) to the message */
 130 /* (growth by: 15 + 64 + 20 + delims = ~110) */
 131 #define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ)
 132 /* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6)
 133  * -- we have BUFSIZ/6 extra at the ent of PRINTBUF
 134  * which covers needed ~110 extra bytes (and much more) */
 135
 136
 137 /* Options */
 138 enum {
 139         OPTBIT_mark = 0, // -m
 140         OPTBIT_nofork, // -n
 141         OPTBIT_outfile, // -O
 142         OPTBIT_loglevel, // -l
 143         OPTBIT_small, // -S
 144         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,) // -s
 145         USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,) // -b
 146         USE_FEATURE_REMOTE_LOG(    OPTBIT_remote     ,) // -R
 147         USE_FEATURE_REMOTE_LOG(    OPTBIT_localtoo   ,) // -L
 148         USE_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,) // -C
 149
 150         OPT_mark        = 1 << OPTBIT_mark    ,
 151         OPT_nofork      = 1 << OPTBIT_nofork  ,
 152         OPT_outfile     = 1 << OPTBIT_outfile ,
 153         OPT_loglevel    = 1 << OPTBIT_loglevel,
 154         OPT_small       = 1 << OPTBIT_small   ,
 155         OPT_filesize    = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
 156         OPT_rotatecnt   = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
 157         OPT_remotelog   = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remote     )) + 0,
 158         OPT_locallog    = USE_FEATURE_REMOTE_LOG(    (1 << OPTBIT_localtoo   )) + 0,
 159         OPT_circularlog = USE_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
 160 };
 161 #define OPTION_STR "m:nO:l:S" \
 162         USE_FEATURE_ROTATE_LOGFILE("s:" ) \
 163         USE_FEATURE_ROTATE_LOGFILE("b:" ) \
 164         USE_FEATURE_REMOTE_LOG(    "R:" ) \
 165         USE_FEATURE_REMOTE_LOG(    "L"  ) \
 166         USE_FEATURE_IPC_SYSLOG(    "C::")
 167 #define OPTION_DECL *opt_m, *opt_l \
 168         USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \
 169         USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
 170         USE_FEATURE_REMOTE_LOG(    ,*opt_R) \
 171         USE_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL)
 172 #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
 173         USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 174         USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 175         USE_FEATURE_REMOTE_LOG(    ,&opt_R) \
 176         USE_FEATURE_IPC_SYSLOG(    ,&opt_C)
 177
 178
 179 /* circular buffer variables/structures */
 180 #if ENABLE_FEATURE_IPC_SYSLOG
 181
 182 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 183 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 184 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 185 #endif
 186
 187 /* our shared key */
 188 #define KEY_ID ((long)0x414e4547) /* "GENA" */
 189
 190 static void ipcsyslog_cleanup(void)
 191 {
 192         if (G.shmid != -1) {
 193                 shmdt(G.shbuf);
 194         }
 195         if (G.shmid != -1) {
 196                 shmctl(G.shmid, IPC_RMID, NULL);
 197         }
 198         if (G.s_semid != -1) {
 199                 semctl(G.s_semid, 0, IPC_RMID, 0);
 200         }
 201 }
 202
 203 static void ipcsyslog_init(void)
 204 {
 205         if (DEBUG)
 206                 printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
 207
 208         G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 1023);
 209         if (G.shmid == -1) {
 210                 bb_perror_msg_and_die("shmget");
 211         }
 212
 213         G.shbuf = shmat(G.shmid, NULL, 0);
 214         if (!G.shbuf) {
 215                 bb_perror_msg_and_die("shmat");
 216         }
 217
 218         G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data);
 219         G.shbuf->head = G.shbuf->tail = 0;
 220
 221         // we'll trust the OS to set initial semval to 0 (let's hope)
 222         G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 223         if (G.s_semid == -1) {
 224                 if (errno == EEXIST) {
 225                         G.s_semid = semget(KEY_ID, 2, 0);
 226                         if (G.s_semid != -1)
 227                                 return;
 228                 }
 229                 bb_perror_msg_and_die("semget");
 230         }
 231 }
 232
 233 /* Write message to shared mem buffer */
 234 static void log_to_shmem(const char *msg, int len)
 235 {
 236         int old_tail, new_tail;
 237         char *c;
 238
 239         if (semop(G.s_semid, G.SMwdn, 3) == -1) {
 240                 bb_perror_msg_and_die("SMwdn");
 241         }
 242
 243         /* Circular Buffer Algorithm:
 244          * --------------------------
 245          * tail == position where to store next syslog message.
 246          * head == position of next message to retrieve ("print").
 247          * if head == tail, there is no "unprinted" messages left.
 248          * head is typically advanced by separate "reader" program,
 249          * but if there isn't one, we have to do it ourself.
 250          * messages are NUL-separated.
 251          */
 252         len++; /* length with NUL included */
 253  again:
 254         old_tail = G.shbuf->tail;
 255         new_tail = old_tail + len;
 256         if (new_tail < G.shbuf->size) {
 257                 /* No need to move head if shbuf->head <= old_tail,
 258                  * else... */
 259                 if (old_tail < G.shbuf->head && G.shbuf->head <= new_tail) {
 260                         /* ...need to move head forward */
 261                         c = memchr(G.shbuf->data + new_tail, '\0',
 262                                            G.shbuf->size - new_tail);
 263                         if (!c) /* no NUL ahead of us, wrap around */
 264                                 c = memchr(G.shbuf->data, '\0', old_tail);
 265                         if (!c) { /* still nothing? point to this msg... */
 266                                 G.shbuf->head = old_tail;
 267                         } else {
 268                                 /* convert pointer to offset + skip NUL */
 269                                 G.shbuf->head = c - G.shbuf->data + 1;
 270                         }
 271                 }
 272                 /* store message, set new tail */
 273                 memcpy(G.shbuf->data + old_tail, msg, len);
 274                 G.shbuf->tail = new_tail;
 275         } else {
 276                 /* we need to break up the message and wrap it around */
 277                 /* k == available buffer space ahead of old tail */
 278                 int k = G.shbuf->size - old_tail - 1;
 279                 if (G.shbuf->head > old_tail) {
 280                         /* we are going to overwrite head, need to
 281                          * move it out of the way */
 282                         c = memchr(G.shbuf->data, '\0', old_tail);
 283                         if (!c) { /* nothing? point to this msg... */
 284                                 G.shbuf->head = old_tail;
 285                         } else { /* convert pointer to offset + skip NUL */
 286                                 G.shbuf->head = c - G.shbuf->data + 1;
 287                         }
 288                 }
 289                 /* copy what fits to the end of buffer, and repeat */
 290                 memcpy(G.shbuf->data + old_tail, msg, k);
 291                 msg += k;
 292                 len -= k;
 293                 G.shbuf->tail = 0;
 294                 goto again;
 295         }
 296         if (semop(G.s_semid, G.SMwup, 1) == -1) {
 297                 bb_perror_msg_and_die("SMwup");
 298         }
 299         if (DEBUG)
 300                 printf("head:%d tail:%d\n", G.shbuf->head, G.shbuf->tail);
 301 }
 302 #else
 303 void ipcsyslog_cleanup(void);
 304 void ipcsyslog_init(void);
 305 void log_to_shmem(const char *msg);
 306 #endif /* FEATURE_IPC_SYSLOG */
 307
 308
 309 /* Print a message to the log file. */
 310 static void log_locally(char *msg)
 311 {
 312         struct flock fl;
 313         int len = strlen(msg);
 314
 315 #if ENABLE_FEATURE_IPC_SYSLOG
 316         if ((option_mask32 & OPT_circularlog) && G.shbuf) {
 317                 log_to_shmem(msg, len);
 318                 return;
 319         }
 320 #endif
 321         if (G.logFD >= 0) {
 322                 time_t cur;
 323                 time(&cur);
 324                 if (G.last_log_time != cur) {
 325                         G.last_log_time = cur; /* reopen log file every second */
 326                         close(G.logFD);
 327                         goto reopen;
 328                 }
 329         } else {
 330  reopen:
 331                 G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
 332                                         | O_NOCTTY | O_APPEND | O_NONBLOCK);
 333                 if (G.logFD < 0) {
 334                         /* cannot open logfile? - print to /dev/console then */
 335                         int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 336                         if (fd < 0)
 337                                 fd = 2; /* then stderr, dammit */
 338                         full_write(fd, msg, len);
 339                         if (fd != 2)
 340                                 close(fd);
 341                         return;
 342                 }
 343 #if ENABLE_FEATURE_ROTATE_LOGFILE
 344                 {
 345                 struct stat statf;
 346
 347                 G.isRegular = (fstat(G.logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
 348                 /* bug (mostly harmless): can wrap around if file > 4gb */
 349                 G.curFileSize = statf.st_size;
 350                 }
 351 #endif
 352         }
 353
 354         fl.l_whence = SEEK_SET;
 355         fl.l_start = 0;
 356         fl.l_len = 1;
 357         fl.l_type = F_WRLCK;
 358         fcntl(G.logFD, F_SETLKW, &fl);
 359
 360 #if ENABLE_FEATURE_ROTATE_LOGFILE
 361         if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
 362                 if (G.logFileRotate) { /* always 0..99 */
 363                         int i = strlen(G.logFilePath) + 3 + 1;
 364                         char oldFile[i];
 365                         char newFile[i];
 366                         i = G.logFileRotate - 1;
 367                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 368                         while (1) {
 369                                 sprintf(newFile, "%s.%d", G.logFilePath, i);
 370                                 if (i == 0) break;
 371                                 sprintf(oldFile, "%s.%d", G.logFilePath, --i);
 372                                 rename(oldFile, newFile);
 373                         }
 374                         /* newFile == "f.0" now */
 375                         rename(G.logFilePath, newFile);
 376                         fl.l_type = F_UNLCK;
 377                         fcntl(G.logFD, F_SETLKW, &fl);
 378                         close(G.logFD);
 379                         goto reopen;
 380                 }
 381                 ftruncate(G.logFD, 0);
 382         }
 383         G.curFileSize +=
 384 #endif
 385                         full_write(G.logFD, msg, len);
 386         fl.l_type = F_UNLCK;
 387         fcntl(G.logFD, F_SETLKW, &fl);
 388 }
 389
 390 static void parse_fac_prio_20(int pri, char *res20)
 391 {
 392         CODE *c_pri, *c_fac;
 393
 394         if (pri != 0) {
 395                 c_fac = facilitynames;
 396                 while (c_fac->c_name) {
 397                         if (c_fac->c_val != (LOG_FAC(pri) << 3)) {
 398                                 c_fac++; continue;
 399                         }
 400                         /* facility is found, look for prio */
 401                         c_pri = prioritynames;
 402                         while (c_pri->c_name) {
 403                                 if (c_pri->c_val != LOG_PRI(pri)) {
 404                                         c_pri++; continue;
 405                                 }
 406                                 snprintf(res20, 20, "%s.%s",
 407                                                 c_fac->c_name, c_pri->c_name);
 408                                 return;
 409                         }
 410                         /* prio not found, bail out */
 411                         break;
 412                 }
 413                 snprintf(res20, 20, "<%d>", pri);
 414         }
 415 }
 416
 417 /* len parameter is used only for "is there a timestamp?" check.
 418  * NB: some callers cheat and supply 0 when they know
 419  * that there is no timestamp, short-cutting the test. */
 420 static void timestamp_and_log(int pri, char *msg, int len)
 421 {
 422         char *timestamp;
 423
 424         if (len < 16 || msg[3] != ' ' || msg[6] != ' '
 425          || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
 426         ) {
 427                 time_t now;
 428                 time(&now);
 429                 timestamp = ctime(&now) + 4;
 430         } else {
 431                 timestamp = msg;
 432                 msg += 16;
 433         }
 434         timestamp[15] = '\0';
 435
 436         /* Log message locally (to file or shared mem) */
 437         if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
 438                 if (LOG_PRI(pri) < G.logLevel) {
 439                         if (option_mask32 & OPT_small)
 440                                 sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
 441                         else {
 442                                 char res[20];
 443                                 parse_fac_prio_20(pri, res);
 444                                 sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
 445                         }
 446                         log_locally(PRINTBUF);
 447                 }
 448         }
 449 }
 450
 451 static void split_escape_and_log(char *tmpbuf, int len)
 452 {
 453         char *p = tmpbuf;
 454
 455         tmpbuf += len;
 456         while (p < tmpbuf) {
 457                 char c;
 458                 char *q = PARSEBUF;
 459                 int pri = (LOG_USER | LOG_NOTICE);
 460
 461                 if (*p == '<') {
 462                         /* Parse the magic priority number */
 463                         pri = bb_strtou(p + 1, &p, 10);
 464                         if (*p == '>') p++;
 465                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
 466                                 pri = (LOG_USER | LOG_NOTICE);
 467                         }
 468                 }
 469
 470                 while ((c = *p++)) {
 471                         if (c == '\n')
 472                                 c = ' ';
 473                         if (!(c & ~0x1f)) {
 474                                 *q++ = '^';
 475                                 c += '@'; /* ^@, ^A, ^B... */
 476                         }
 477                         *q++ = c;
 478                 }
 479                 *q = '\0';
 480                 /* Now log it */
 481                 timestamp_and_log(pri, PARSEBUF, q - PARSEBUF);
 482         }
 483 }
 484
 485 static void quit_signal(int sig)
 486 {
 487         timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0);
 488         puts("syslogd exiting");
 489         if (ENABLE_FEATURE_IPC_SYSLOG)
 490                 ipcsyslog_cleanup();
 491         exit(1);
 492 }
 493
 494 #ifdef SYSLOGD_MARK
 495 static void do_mark(int sig)
 496 {
 497         if (G.markInterval) {
 498                 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
 499                 alarm(G.markInterval);
 500         }
 501 }
 502 #endif
 503
 504 static void do_syslogd(void) ATTRIBUTE_NORETURN;
 505 static void do_syslogd(void)
 506 {
 507         struct sockaddr_un sunx;
 508         int sock_fd;
 509         fd_set fds;
 510         char *dev_log_name;
 511
 512         /* Set up signal handlers */
 513         signal(SIGINT, quit_signal);
 514         signal(SIGTERM, quit_signal);
 515         signal(SIGQUIT, quit_signal);
 516         signal(SIGHUP, SIG_IGN);
 517         signal(SIGCHLD, SIG_IGN);
 518 #ifdef SIGCLD
 519         signal(SIGCLD, SIG_IGN);
 520 #endif
 521 #ifdef SYSLOGD_MARK
 522         signal(SIGALRM, do_mark);
 523         alarm(G.markInterval);
 524 #endif
 525
 526         memset(&sunx, 0, sizeof(sunx));
 527         sunx.sun_family = AF_UNIX;
 528         strcpy(sunx.sun_path, "/dev/log");
 529
 530         /* Unlink old /dev/log or object it points to. */
 531         /* (if it exists, bind will fail) */
 532         logmode = LOGMODE_NONE;
 533         dev_log_name = xmalloc_readlink_or_warn("/dev/log");
 534         logmode = LOGMODE_STDIO;
 535         if (dev_log_name) {
 536                 int fd = xopen(".", O_NONBLOCK);
 537                 xchdir("/dev");
 538                 /* we do not check whether this is a link also */
 539                 unlink(dev_log_name);
 540                 fchdir(fd);
 541                 close(fd);
 542                 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 543                 free(dev_log_name);
 544         } else {
 545                 unlink("/dev/log");
 546         }
 547
 548         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 549         xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
 550
 551         if (chmod("/dev/log", 0666) < 0) {
 552                 bb_perror_msg_and_die("cannot set permission on /dev/log");
 553         }
 554         if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
 555                 ipcsyslog_init();
 556         }
 557
 558         timestamp_and_log(LOG_SYSLOG | LOG_INFO,
 559                         (char*)"syslogd started: BusyBox v" BB_VER, 0);
 560
 561         for (;;) {
 562                 FD_ZERO(&fds);
 563                 FD_SET(sock_fd, &fds);
 564
 565                 if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
 566                         if (errno == EINTR) {
 567                                 /* alarm may have happened */
 568                                 continue;
 569                         }
 570                         bb_perror_msg_and_die("select");
 571                 }
 572
 573                 if (FD_ISSET(sock_fd, &fds)) {
 574                         int i;
 575                         i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0);
 576                         if (i <= 0)
 577                                 bb_perror_msg_and_die("UNIX socket error");
 578                         /* TODO: maybe suppress duplicates? */
 579 #if ENABLE_FEATURE_REMOTE_LOG
 580                         /* We are not modifying log messages in any way before send */
 581                         /* Remote site cannot trust _us_ anyway and need to do validation again */
 582                         if (G.remoteAddr) {
 583                                 if (-1 == G.remoteFD) {
 584                                         G.remoteFD = socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
 585                                 }
 586                                 if (-1 != G.remoteFD) {
 587                                         /* send message to remote logger, ignore possible error */
 588                                         sendto(G.remoteFD, RECVBUF, i, MSG_DONTWAIT,
 589                                                 &G.remoteAddr->sa, G.remoteAddr->len);
 590                                 }
 591                         }
 592 #endif
 593                         RECVBUF[i] = '\0';
 594                         split_escape_and_log(RECVBUF, i);
 595                 } /* FD_ISSET() */
 596         } /* for */
 597 }
 598
 599 int syslogd_main(int argc, char **argv);
 600 int syslogd_main(int argc, char **argv)
 601 {
 602         char OPTION_DECL;
 603         char *p;
 604
 605         PTR_TO_GLOBALS = xzalloc(sizeof(G));
 606         memcpy(ptr_to_globals, &init_globals, sizeof(init_globals));
 607
 608         /* do normal option parsing */
 609         opt_complementary = "=0"; /* no non-option params */
 610         getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
 611 #ifdef SYSLOGD_MARK
 612         if (option_mask32 & OPT_mark) // -m
 613                 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
 614 #endif
 615         //if (option_mask32 & OPT_nofork) // -n
 616         //if (option_mask32 & OPT_outfile) // -O
 617         if (option_mask32 & OPT_loglevel) // -l
 618                 G.logLevel = xatou_range(opt_l, 1, 8);
 619         //if (option_mask32 & OPT_small) // -S
 620 #if ENABLE_FEATURE_ROTATE_LOGFILE
 621         if (option_mask32 & OPT_filesize) // -s
 622                 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
 623         if (option_mask32 & OPT_rotatecnt) // -b
 624                 G.logFileRotate = xatou_range(opt_b, 0, 99);
 625 #endif
 626 #if ENABLE_FEATURE_REMOTE_LOG
 627         if (option_mask32 & OPT_remotelog) { // -R
 628                 G.remoteAddr = xhost2sockaddr(opt_R, 514);
 629         }
 630         //if (option_mask32 & OPT_locallog) // -L
 631 #endif
 632 #if ENABLE_FEATURE_IPC_SYSLOG
 633         if (opt_C) // -Cn
 634                 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
 635 #endif
 636
 637         /* If they have not specified remote logging, then log locally */
 638         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog))
 639                 option_mask32 |= OPT_locallog;
 640
 641         /* Store away localhost's name before the fork */
 642         gethostname(G.localHostName, sizeof(G.localHostName));
 643         p = strchr(G.localHostName, '.');
 644         if (p) {
 645                 *p = '\0';
 646         }
 647
 648         if (!(option_mask32 & OPT_nofork)) {
 649 #ifdef BB_NOMMU
 650                 vfork_daemon_rexec(0, 1, argc, argv, "-n");
 651 #else
 652                 bb_daemonize();
 653 #endif
 654         }
 655         umask(0);
 656         do_syslogd();
 657         /* return EXIT_SUCCESS; */
 658 }