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