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 GPLv2 or later, see file LICENSE in this source tree.
  14  */
  15 //config:config SYSLOGD
  16 //config:       bool "syslogd (13 kb)"
  17 //config:       default y
  18 //config:       help
  19 //config:       The syslogd utility is used to record logs of all the
  20 //config:       significant events that occur on a system. Every
  21 //config:       message that is logged records the date and time of the
  22 //config:       event, and will generally also record the name of the
  23 //config:       application that generated the message. When used in
  24 //config:       conjunction with klogd, messages from the Linux kernel
  25 //config:       can also be recorded. This is terribly useful,
  26 //config:       especially for finding what happened when something goes
  27 //config:       wrong. And something almost always will go wrong if
  28 //config:       you wait long enough....
  29 //config:
  30 //config:config FEATURE_ROTATE_LOGFILE
  31 //config:       bool "Rotate message files"
  32 //config:       default y
  33 //config:       depends on SYSLOGD
  34 //config:       help
  35 //config:       This enables syslogd to rotate the message files
  36 //config:       on his own. No need to use an external rotate script.
  37 //config:
  38 //config:config FEATURE_REMOTE_LOG
  39 //config:       bool "Remote Log support"
  40 //config:       default y
  41 //config:       depends on SYSLOGD
  42 //config:       help
  43 //config:       When you enable this feature, the syslogd utility can
  44 //config:       be used to send system log messages to another system
  45 //config:       connected via a network. This allows the remote
  46 //config:       machine to log all the system messages, which can be
  47 //config:       terribly useful for reducing the number of serial
  48 //config:       cables you use. It can also be a very good security
  49 //config:       measure to prevent system logs from being tampered with
  50 //config:       by an intruder.
  51 //config:
  52 //config:config FEATURE_SYSLOGD_DUP
  53 //config:       bool "Support -D (drop dups) option"
  54 //config:       default y
  55 //config:       depends on SYSLOGD
  56 //config:       help
  57 //config:       Option -D instructs syslogd to drop consecutive messages
  58 //config:       which are totally the same.
  59 //config:
  60 //config:config FEATURE_SYSLOGD_CFG
  61 //config:       bool "Support syslog.conf"
  62 //config:       default y
  63 //config:       depends on SYSLOGD
  64 //config:       help
  65 //config:       Supports restricted syslogd config. See docs/syslog.conf.txt
  66 //config:
  67 //config:config FEATURE_SYSLOGD_PRECISE_TIMESTAMPS
  68 //config:       bool "Include milliseconds in timestamps"
  69 //config:       default n
  70 //config:       depends on SYSLOGD
  71 //config:       help
  72 //config:       Includes milliseconds (HH:MM:SS.mmm) in timestamp when
  73 //config:       timestamps are added.
  74 //config:
  75 //config:config FEATURE_SYSLOGD_READ_BUFFER_SIZE
  76 //config:       int "Read buffer size in bytes"
  77 //config:       default 256
  78 //config:       range 256 20000
  79 //config:       depends on SYSLOGD
  80 //config:       help
  81 //config:       This option sets the size of the syslog read buffer.
  82 //config:       Actual memory usage increases around five times the
  83 //config:       change done here.
  84 //config:
  85 //config:config FEATURE_IPC_SYSLOG
  86 //config:       bool "Circular Buffer support"
  87 //config:       default y
  88 //config:       depends on SYSLOGD
  89 //config:       help
  90 //config:       When you enable this feature, the syslogd utility will
  91 //config:       use a circular buffer to record system log messages.
  92 //config:       When the buffer is filled it will continue to overwrite
  93 //config:       the oldest messages. This can be very useful for
  94 //config:       systems with little or no permanent storage, since
  95 //config:       otherwise system logs can eventually fill up your
  96 //config:       entire filesystem, which may cause your system to
  97 //config:       break badly.
  98 //config:
  99 //config:config FEATURE_IPC_SYSLOG_BUFFER_SIZE
 100 //config:       int "Circular buffer size in Kbytes (minimum 4KB)"
 101 //config:       default 16
 102 //config:       range 4 2147483647
 103 //config:       depends on FEATURE_IPC_SYSLOG
 104 //config:       help
 105 //config:       This option sets the size of the circular buffer
 106 //config:       used to record system log messages.
 107 //config:
 108 //config:config FEATURE_KMSG_SYSLOG
 109 //config:       bool "Linux kernel printk buffer support"
 110 //config:       default y
 111 //config:       depends on SYSLOGD
 112 //config:       select PLATFORM_LINUX
 113 //config:       help
 114 //config:       When you enable this feature, the syslogd utility will
 115 //config:       write system log message to the Linux kernel's printk buffer.
 116 //config:       This can be used as a smaller alternative to the syslogd IPC
 117 //config:       support, as klogd and logread aren't needed.
 118 //config:
 119 //config:       NOTICE: Syslog facilities in log entries needs kernel 3.5+.
 120
 121 //applet:IF_SYSLOGD(APPLET(syslogd, BB_DIR_SBIN, BB_SUID_DROP))
 122
 123 //kbuild:lib-$(CONFIG_SYSLOGD) += syslogd_and_logger.o
 124
 125 //usage:#define syslogd_trivial_usage
 126 //usage:       "[OPTIONS]"
 127 //usage:#define syslogd_full_usage "\n\n"
 128 //usage:       "System logging utility\n"
 129 //usage:        IF_NOT_FEATURE_SYSLOGD_CFG(
 130 //usage:       "(this version of syslogd ignores /etc/syslog.conf)\n"
 131 //usage:        )
 132 //usage:     "\n        -n              Run in foreground"
 133 //usage:        IF_FEATURE_REMOTE_LOG(
 134 //usage:     "\n        -R HOST[:PORT]  Log to HOST:PORT (default PORT:514)"
 135 //usage:     "\n        -L              Log locally and via network (default is network only if -R)"
 136 //usage:        )
 137 //usage:        IF_FEATURE_IPC_SYSLOG(
 138 /* NB: -Csize shouldn't have space (because size is optional) */
 139 //usage:     "\n        -C[size_kb]     Log to shared mem buffer (use logread to read it)"
 140 //usage:        )
 141 //usage:        IF_FEATURE_KMSG_SYSLOG(
 142 //usage:     "\n        -K              Log to kernel printk buffer (use dmesg to read it)"
 143 //usage:        )
 144 //usage:     "\n        -O FILE         Log to FILE (default: /var/log/messages, stdout if -)"
 145 //usage:        IF_FEATURE_ROTATE_LOGFILE(
 146 //usage:     "\n        -s SIZE         Max size (KB) before rotation (default 200KB, 0=off)"
 147 //usage:     "\n        -b N            N rotated logs to keep (default 1, max 99, 0=purge)"
 148 //usage:        )
 149 //usage:     "\n        -l N            Log only messages more urgent than prio N (1-8)"
 150 //usage:     "\n        -S              Smaller output"
 151 //usage:     "\n        -t              Strip client-generated timestamps"
 152 //usage:        IF_FEATURE_SYSLOGD_DUP(
 153 //usage:     "\n        -D              Drop duplicates"
 154 //usage:        )
 155 //usage:        IF_FEATURE_SYSLOGD_CFG(
 156 //usage:     "\n        -f FILE         Use FILE as config (default:/etc/syslog.conf)"
 157 //usage:        )
 158 /* //usage:  "\n        -m MIN          Minutes between MARK lines (default 20, 0=off)" */
 159 //usage:
 160 //usage:#define syslogd_example_usage
 161 //usage:       "$ syslogd -R masterlog:514\n"
 162 //usage:       "$ syslogd -R 192.168.1.1:601\n"
 163
 164 /*
 165  * Done in syslogd_and_logger.c:
 166 #include "libbb.h"
 167 #define SYSLOG_NAMES
 168 #define SYSLOG_NAMES_CONST
 169 #include <syslog.h>
 170 */
 171 #ifndef _PATH_LOG
 172 #define _PATH_LOG       "/dev/log"
 173 #endif
 174
 175 #include <sys/un.h>
 176 #include <sys/uio.h>
 177
 178 #if ENABLE_FEATURE_REMOTE_LOG
 179 #include <netinet/in.h>
 180 #endif
 181
 182 #if ENABLE_FEATURE_IPC_SYSLOG
 183 #include <sys/ipc.h>
 184 #include <sys/sem.h>
 185 #include <sys/shm.h>
 186 #endif
 187
 188
 189 #define DEBUG 0
 190
 191 /* MARK code is not very useful, is bloat, and broken:
 192  * can deadlock if alarmed to make MARK while writing to IPC buffer
 193  * (semaphores are down but do_mark routine tries to down them again) */
 194 #undef SYSLOGD_MARK
 195
 196 /* Write locking does not seem to be useful either */
 197 #undef SYSLOGD_WRLOCK
 198
 199 enum {
 200         MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
 201         DNS_WAIT_SEC = 2 * 60,
 202 };
 203
 204 /* Semaphore operation structures */
 205 struct shbuf_ds {
 206         int32_t size;   /* size of data - 1 */
 207         int32_t tail;   /* end of message list */
 208         char data[1];   /* data/messages */
 209 };
 210
 211 #if ENABLE_FEATURE_REMOTE_LOG
 212 typedef struct {
 213         int remoteFD;
 214         unsigned last_dns_resolve;
 215         len_and_sockaddr *remoteAddr;
 216         const char *remoteHostname;
 217 } remoteHost_t;
 218 #endif
 219
 220 typedef struct logFile_t {
 221         const char *path;
 222         int fd;
 223         time_t last_log_time;
 224 #if ENABLE_FEATURE_ROTATE_LOGFILE
 225         unsigned size;
 226         uint8_t isRegular;
 227 #endif
 228 } logFile_t;
 229
 230 #if ENABLE_FEATURE_SYSLOGD_CFG
 231 typedef struct logRule_t {
 232         uint8_t enabled_facility_priomap[LOG_NFACILITIES];
 233         struct logFile_t *file;
 234         struct logRule_t *next;
 235 } logRule_t;
 236 #endif
 237
 238 /* Allows us to have smaller initializer. Ugly. */
 239 #define GLOBALS \
 240         logFile_t logFile;                      \
 241         /* interval between marks in seconds */ \
 242         /*int markInterval;*/                   \
 243         /* level of messages to be logged */    \
 244         int logLevel;                           \
 245 IF_FEATURE_ROTATE_LOGFILE( \
 246         /* max size of file before rotation */  \
 247         unsigned logFileSize;                   \
 248         /* number of rotated message files */   \
 249         unsigned logFileRotate;                 \
 250 ) \
 251 IF_FEATURE_IPC_SYSLOG( \
 252         int shmid; /* ipc shared memory id */   \
 253         int s_semid; /* ipc semaphore id */     \
 254         int shm_size;                           \
 255         struct sembuf SMwup[1];                 \
 256         struct sembuf SMwdn[3];                 \
 257 ) \
 258 IF_FEATURE_SYSLOGD_CFG( \
 259         logRule_t *log_rules; \
 260 ) \
 261 IF_FEATURE_KMSG_SYSLOG( \
 262         int kmsgfd; \
 263         int primask; \
 264 )
 265
 266 struct init_globals {
 267         GLOBALS
 268 };
 269
 270 struct globals {
 271         GLOBALS
 272
 273 #if ENABLE_FEATURE_REMOTE_LOG
 274         llist_t *remoteHosts;
 275 #endif
 276 #if ENABLE_FEATURE_IPC_SYSLOG
 277         struct shbuf_ds *shbuf;
 278 #endif
 279         /* localhost's name. We print only first 64 chars */
 280         char *hostname;
 281
 282         /* We recv into recvbuf... */
 283         char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
 284         /* ...then copy to parsebuf, escaping control chars */
 285         /* (can grow x2 max) */
 286         char parsebuf[MAX_READ*2];
 287         /* ...then sprintf into printbuf, adding timestamp (15 or 19 chars),
 288          * host (64), fac.prio (20) to the message */
 289         /* (growth by: 15 + 64 + 20 + delims = ~110) */
 290         char printbuf[MAX_READ*2 + 128];
 291 };
 292
 293 static const struct init_globals init_data = {
 294         .logFile = {
 295                 .path = "/var/log/messages",
 296                 .fd = -1,
 297         },
 298 #ifdef SYSLOGD_MARK
 299         .markInterval = 20 * 60,
 300 #endif
 301         .logLevel = 8,
 302 #if ENABLE_FEATURE_ROTATE_LOGFILE
 303         .logFileSize = 200 * 1024,
 304         .logFileRotate = 1,
 305 #endif
 306 #if ENABLE_FEATURE_IPC_SYSLOG
 307         .shmid = -1,
 308         .s_semid = -1,
 309         .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
 310         .SMwup = { {1, -1, IPC_NOWAIT} },
 311         .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
 312 #endif
 313 };
 314
 315 #define G (*ptr_to_globals)
 316 #define INIT_G() do { \
 317         SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
 318 } while (0)
 319
 320
 321 /* Options */
 322 enum {
 323         OPTBIT_mark = 0, // -m
 324         OPTBIT_nofork, // -n
 325         OPTBIT_outfile, // -O
 326         OPTBIT_loglevel, // -l
 327         OPTBIT_small, // -S
 328         OPTBIT_timestamp, // -t
 329         IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize   ,)  // -s
 330         IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt  ,)  // -b
 331         IF_FEATURE_REMOTE_LOG(    OPTBIT_remotelog  ,)  // -R
 332         IF_FEATURE_REMOTE_LOG(    OPTBIT_locallog   ,)  // -L
 333         IF_FEATURE_IPC_SYSLOG(    OPTBIT_circularlog,)  // -C
 334         IF_FEATURE_SYSLOGD_DUP(   OPTBIT_dup        ,)  // -D
 335         IF_FEATURE_SYSLOGD_CFG(   OPTBIT_cfg        ,)  // -f
 336         IF_FEATURE_KMSG_SYSLOG(   OPTBIT_kmsg       ,)  // -K
 337
 338         OPT_mark        = 1 << OPTBIT_mark    ,
 339         OPT_nofork      = 1 << OPTBIT_nofork  ,
 340         OPT_outfile     = 1 << OPTBIT_outfile ,
 341         OPT_loglevel    = 1 << OPTBIT_loglevel,
 342         OPT_small       = 1 << OPTBIT_small   ,
 343         OPT_timestamp   = 1 << OPTBIT_timestamp,
 344         OPT_filesize    = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize   )) + 0,
 345         OPT_rotatecnt   = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt  )) + 0,
 346         OPT_remotelog   = IF_FEATURE_REMOTE_LOG(    (1 << OPTBIT_remotelog  )) + 0,
 347         OPT_locallog    = IF_FEATURE_REMOTE_LOG(    (1 << OPTBIT_locallog   )) + 0,
 348         OPT_circularlog = IF_FEATURE_IPC_SYSLOG(    (1 << OPTBIT_circularlog)) + 0,
 349         OPT_dup         = IF_FEATURE_SYSLOGD_DUP(   (1 << OPTBIT_dup        )) + 0,
 350         OPT_cfg         = IF_FEATURE_SYSLOGD_CFG(   (1 << OPTBIT_cfg        )) + 0,
 351         OPT_kmsg        = IF_FEATURE_KMSG_SYSLOG(   (1 << OPTBIT_kmsg       )) + 0,
 352 };
 353 #define OPTION_STR "m:nO:l:St" \
 354         IF_FEATURE_ROTATE_LOGFILE("s:" ) \
 355         IF_FEATURE_ROTATE_LOGFILE("b:" ) \
 356         IF_FEATURE_REMOTE_LOG(    "R:*") \
 357         IF_FEATURE_REMOTE_LOG(    "L"  ) \
 358         IF_FEATURE_IPC_SYSLOG(    "C::") \
 359         IF_FEATURE_SYSLOGD_DUP(   "D"  ) \
 360         IF_FEATURE_SYSLOGD_CFG(   "f:" ) \
 361         IF_FEATURE_KMSG_SYSLOG(   "K"  )
 362 #define OPTION_DECL *opt_m, *opt_l \
 363         IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
 364         IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
 365         IF_FEATURE_IPC_SYSLOG(    ,*opt_C = NULL) \
 366         IF_FEATURE_SYSLOGD_CFG(   ,*opt_f = NULL)
 367 #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
 368         IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
 369         IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
 370         IF_FEATURE_REMOTE_LOG(    ,&remoteAddrList) \
 371         IF_FEATURE_IPC_SYSLOG(    ,&opt_C) \
 372         IF_FEATURE_SYSLOGD_CFG(   ,&opt_f)
 373
 374
 375 #if ENABLE_FEATURE_SYSLOGD_CFG
 376 static const CODE* find_by_name(char *name, const CODE* c_set)
 377 {
 378         for (; c_set->c_name; c_set++) {
 379                 if (strcmp(name, c_set->c_name) == 0)
 380                         return c_set;
 381         }
 382         return NULL;
 383 }
 384 #endif
 385 static const CODE* find_by_val(int val, const CODE* c_set)
 386 {
 387         for (; c_set->c_name; c_set++) {
 388                 if (c_set->c_val == val)
 389                         return c_set;
 390         }
 391         return NULL;
 392 }
 393
 394 #if ENABLE_FEATURE_SYSLOGD_CFG
 395 static void parse_syslogdcfg(const char *file)
 396 {
 397         char *t;
 398         logRule_t **pp_rule;
 399         /* tok[0] set of selectors */
 400         /* tok[1] file name */
 401         /* tok[2] has to be NULL */
 402         char *tok[3];
 403         parser_t *parser;
 404
 405         parser = config_open2(file ? file : "/etc/syslog.conf",
 406                                 file ? xfopen_for_read : fopen_for_read);
 407         if (!parser)
 408                 /* didn't find default /etc/syslog.conf */
 409                 /* proceed as if we built busybox without config support */
 410                 return;
 411
 412         /* use ptr to ptr to avoid checking whether head was initialized */
 413         pp_rule = &G.log_rules;
 414         /* iterate through lines of config, skipping comments */
 415         while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
 416                 char *cur_selector;
 417                 logRule_t *cur_rule;
 418
 419                 /* unexpected trailing token? */
 420                 if (tok[2])
 421                         goto cfgerr;
 422
 423                 cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
 424
 425                 cur_selector = tok[0];
 426                 /* iterate through selectors: "kern.info;kern.!err;..." */
 427                 do {
 428                         const CODE *code;
 429                         char *next_selector;
 430                         uint8_t negated_prio; /* "kern.!err" */
 431                         uint8_t single_prio;  /* "kern.=err" */
 432                         uint32_t facmap; /* bitmap of enabled facilities */
 433                         uint8_t primap;  /* bitmap of enabled priorities */
 434                         unsigned i;
 435
 436                         next_selector = strchr(cur_selector, ';');
 437                         if (next_selector)
 438                                 *next_selector++ = '\0';
 439
 440                         t = strchr(cur_selector, '.');
 441                         if (!t)
 442                                 goto cfgerr;
 443                         *t++ = '\0'; /* separate facility from priority */
 444
 445                         negated_prio = 0;
 446                         single_prio = 0;
 447                         if (*t == '!') {
 448                                 negated_prio = 1;
 449                                 ++t;
 450                         }
 451                         if (*t == '=') {
 452                                 single_prio = 1;
 453                                 ++t;
 454                         }
 455
 456                         /* parse priority */
 457                         if (*t == '*')
 458                                 primap = 0xff; /* all 8 log levels enabled */
 459                         else {
 460                                 uint8_t priority;
 461                                 code = find_by_name(t, bb_prioritynames);
 462                                 if (!code)
 463                                         goto cfgerr;
 464                                 primap = 0;
 465                                 priority = code->c_val;
 466                                 if (priority == INTERNAL_NOPRI) {
 467                                         /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
 468                                         negated_prio = 1;
 469                                 } else {
 470                                         priority = 1 << priority;
 471                                         do {
 472                                                 primap |= priority;
 473                                                 if (single_prio)
 474                                                         break;
 475                                                 priority >>= 1;
 476                                         } while (priority);
 477                                         if (negated_prio)
 478                                                 primap = ~primap;
 479                                 }
 480                         }
 481
 482                         /* parse facility */
 483                         if (*cur_selector == '*')
 484                                 facmap = (1<<LOG_NFACILITIES) - 1;
 485                         else {
 486                                 char *next_facility;
 487                                 facmap = 0;
 488                                 t = cur_selector;
 489                                 /* iterate through facilities: "kern,daemon.<priospec>" */
 490                                 do {
 491                                         next_facility = strchr(t, ',');
 492                                         if (next_facility)
 493                                                 *next_facility++ = '\0';
 494                                         code = find_by_name(t, bb_facilitynames);
 495                                         if (!code)
 496                                                 goto cfgerr;
 497                                         /* "mark" is not a real facility, skip it */
 498                                         if (code->c_val != INTERNAL_MARK)
 499                                                 facmap |= 1<<(LOG_FAC(code->c_val));
 500                                         t = next_facility;
 501                                 } while (t);
 502                         }
 503
 504                         /* merge result with previous selectors */
 505                         for (i = 0; i < LOG_NFACILITIES; ++i) {
 506                                 if (!(facmap & (1<<i)))
 507                                         continue;
 508                                 if (negated_prio)
 509                                         cur_rule->enabled_facility_priomap[i] &= primap;
 510                                 else
 511                                         cur_rule->enabled_facility_priomap[i] |= primap;
 512                         }
 513
 514                         cur_selector = next_selector;
 515                 } while (cur_selector);
 516
 517                 /* check whether current file name was mentioned in previous rules or
 518                  * as global logfile (G.logFile).
 519                  */
 520                 if (strcmp(G.logFile.path, tok[1]) == 0) {
 521                         cur_rule->file = &G.logFile;
 522                         goto found;
 523                 }
 524                 /* temporarily use cur_rule as iterator, but *pp_rule still points
 525                  * to currently processing rule entry.
 526                  * NOTE: *pp_rule points to the current (and last in the list) rule.
 527                  */
 528                 for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
 529                         if (strcmp(cur_rule->file->path, tok[1]) == 0) {
 530                                 /* found - reuse the same file structure */
 531                                 (*pp_rule)->file = cur_rule->file;
 532                                 cur_rule = *pp_rule;
 533                                 goto found;
 534                         }
 535                 }
 536                 cur_rule->file = xzalloc(sizeof(*cur_rule->file));
 537                 cur_rule->file->fd = -1;
 538                 cur_rule->file->path = xstrdup(tok[1]);
 539  found:
 540                 pp_rule = &cur_rule->next;
 541         }
 542         config_close(parser);
 543         return;
 544
 545  cfgerr:
 546         bb_error_msg_and_die("error in '%s' at line %d",
 547                         file ? file : "/etc/syslog.conf",
 548                         parser->lineno);
 549 }
 550 #endif
 551
 552 /* circular buffer variables/structures */
 553 #if ENABLE_FEATURE_IPC_SYSLOG
 554
 555 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
 556 #error Sorry, you must set the syslogd buffer size to at least 4KB.
 557 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
 558 #endif
 559
 560 /* our shared key (syslogd.c and logread.c must be in sync) */
 561 enum { KEY_ID = 0x414e4547 }; /* "GENA" */
 562
 563 static void ipcsyslog_cleanup(void)
 564 {
 565         if (G.shmid != -1) {
 566                 shmdt(G.shbuf);
 567         }
 568         if (G.shmid != -1) {
 569                 shmctl(G.shmid, IPC_RMID, NULL);
 570         }
 571         if (G.s_semid != -1) {
 572                 semctl(G.s_semid, 0, IPC_RMID, 0);
 573         }
 574 }
 575
 576 static void ipcsyslog_init(void)
 577 {
 578         if (DEBUG)
 579                 printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
 580
 581         G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
 582         if (G.shmid == -1) {
 583                 bb_simple_perror_msg_and_die("shmget");
 584         }
 585
 586         G.shbuf = shmat(G.shmid, NULL, 0);
 587         if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
 588                 bb_simple_perror_msg_and_die("shmat");
 589         }
 590
 591         memset(G.shbuf, 0, G.shm_size);
 592         G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
 593         /*G.shbuf->tail = 0;*/
 594
 595         /* we'll trust the OS to set initial semval to 0 (let's hope) */
 596         G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
 597         if (G.s_semid == -1) {
 598                 if (errno == EEXIST) {
 599                         G.s_semid = semget(KEY_ID, 2, 0);
 600                         if (G.s_semid != -1)
 601                                 return;
 602                 }
 603                 bb_simple_perror_msg_and_die("semget");
 604         }
 605 }
 606
 607 /* Write message to shared mem buffer */
 608 static void log_to_shmem(const char *msg)
 609 {
 610         int old_tail, new_tail;
 611         int len;
 612
 613         if (semop(G.s_semid, G.SMwdn, 3) == -1) {
 614                 bb_simple_perror_msg_and_die("SMwdn");
 615         }
 616
 617         /* Circular Buffer Algorithm:
 618          * --------------------------
 619          * tail == position where to store next syslog message.
 620          * tail's max value is (shbuf->size - 1)
 621          * Last byte of buffer is never used and remains NUL.
 622          */
 623         len = strlen(msg) + 1; /* length with NUL included */
 624  again:
 625         old_tail = G.shbuf->tail;
 626         new_tail = old_tail + len;
 627         if (new_tail < G.shbuf->size) {
 628                 /* store message, set new tail */
 629                 memcpy(G.shbuf->data + old_tail, msg, len);
 630                 G.shbuf->tail = new_tail;
 631         } else {
 632                 /* k == available buffer space ahead of old tail */
 633                 int k = G.shbuf->size - old_tail;
 634                 /* copy what fits to the end of buffer, and repeat */
 635                 memcpy(G.shbuf->data + old_tail, msg, k);
 636                 msg += k;
 637                 len -= k;
 638                 G.shbuf->tail = 0;
 639                 goto again;
 640         }
 641         if (semop(G.s_semid, G.SMwup, 1) == -1) {
 642                 bb_simple_perror_msg_and_die("SMwup");
 643         }
 644         if (DEBUG)
 645                 printf("tail:%d\n", G.shbuf->tail);
 646 }
 647 #else
 648 static void ipcsyslog_cleanup(void) {}
 649 static void ipcsyslog_init(void) {}
 650 void log_to_shmem(const char *msg);
 651 #endif /* FEATURE_IPC_SYSLOG */
 652
 653 #if ENABLE_FEATURE_KMSG_SYSLOG
 654 static void kmsg_init(void)
 655 {
 656         G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
 657
 658         /*
 659          * kernel < 3.5 expects single char printk KERN_* priority prefix,
 660          * from 3.5 onwards the full syslog facility/priority format is supported
 661          */
 662         if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
 663                 G.primask = LOG_PRIMASK;
 664         else
 665                 G.primask = -1;
 666 }
 667
 668 static void kmsg_cleanup(void)
 669 {
 670         if (ENABLE_FEATURE_CLEAN_UP)
 671                 close(G.kmsgfd);
 672 }
 673
 674 /* Write message to /dev/kmsg */
 675 static void log_to_kmsg(int pri, const char *msg)
 676 {
 677         /*
 678          * kernel < 3.5 expects single char printk KERN_* priority prefix,
 679          * from 3.5 onwards the full syslog facility/priority format is supported
 680          */
 681         pri &= G.primask;
 682
 683         full_write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
 684 }
 685 #else
 686 static void kmsg_init(void) {}
 687 static void kmsg_cleanup(void) {}
 688 static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
 689 #endif /* FEATURE_KMSG_SYSLOG */
 690
 691 /* Print a message to the log file. */
 692 static void log_locally(time_t now, char *msg, logFile_t *log_file)
 693 {
 694 #ifdef SYSLOGD_WRLOCK
 695         struct flock fl;
 696 #endif
 697         int len = strlen(msg);
 698
 699         /* fd can't be 0 (we connect fd 0 to /dev/log socket) */
 700         /* fd is 1 if "-O -" is in use */
 701         if (log_file->fd > 1) {
 702                 /* Reopen log files every second. This allows admin
 703                  * to delete the files and not worry about restarting us.
 704                  * This costs almost nothing since it happens
 705                  * _at most_ once a second for each file, and happens
 706                  * only when each file is actually written.
 707                  */
 708                 if (!now)
 709                         now = time(NULL);
 710                 if (log_file->last_log_time != now) {
 711                         log_file->last_log_time = now;
 712                         close(log_file->fd);
 713                         goto reopen;
 714                 }
 715         }
 716         else if (log_file->fd == 1) {
 717                 /* We are logging to stdout: do nothing */
 718         }
 719         else {
 720                 if (LONE_DASH(log_file->path)) {
 721                         log_file->fd = 1;
 722                         /* log_file->isRegular = 0; - already is */
 723                 } else {
 724  reopen:
 725                         log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
 726                                         | O_NOCTTY | O_APPEND | O_NONBLOCK,
 727                                         0666);
 728                         if (log_file->fd < 0) {
 729                                 /* cannot open logfile? - print to /dev/console then */
 730                                 int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
 731                                 if (fd < 0)
 732                                         fd = 2; /* then stderr, dammit */
 733                                 full_write(fd, msg, len);
 734                                 if (fd != 2)
 735                                         close(fd);
 736                                 return;
 737                         }
 738 #if ENABLE_FEATURE_ROTATE_LOGFILE
 739                         {
 740                                 struct stat statf;
 741                                 log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
 742                                 /* bug (mostly harmless): can wrap around if file > 4gb */
 743                                 log_file->size = statf.st_size;
 744                         }
 745 #endif
 746                 }
 747         }
 748
 749 #ifdef SYSLOGD_WRLOCK
 750         fl.l_whence = SEEK_SET;
 751         fl.l_start = 0;
 752         fl.l_len = 1;
 753         fl.l_type = F_WRLCK;
 754         fcntl(log_file->fd, F_SETLKW, &fl);
 755 #endif
 756
 757 #if ENABLE_FEATURE_ROTATE_LOGFILE
 758         if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
 759                 if (G.logFileRotate) { /* always 0..99 */
 760                         int i = strlen(log_file->path) + 3 + 1;
 761                         char oldFile[i];
 762                         char newFile[i];
 763                         i = G.logFileRotate - 1;
 764                         /* rename: f.8 -> f.9; f.7 -> f.8; ... */
 765                         while (1) {
 766                                 sprintf(newFile, "%s.%d", log_file->path, i);
 767                                 if (i == 0) break;
 768                                 sprintf(oldFile, "%s.%d", log_file->path, --i);
 769                                 /* ignore errors - file might be missing */
 770                                 rename(oldFile, newFile);
 771                         }
 772                         /* newFile == "f.0" now */
 773                         rename(log_file->path, newFile);
 774                 }
 775
 776                 /* We may or may not have just renamed the file away;
 777                  * if we didn't rename because we aren't keeping any backlog,
 778                  * then it's time to clobber the file. If we did rename it...,
 779                  * incredibly, if F and F.0 are hardlinks, POSIX _demands_
 780                  * that rename returns 0 but does not remove F!!!
 781                  * (hardlinked F/F.0 pair was observed after
 782                  * power failure during rename()).
 783                  * So ensure old file is gone in any case:
 784                  */
 785                 unlink(log_file->path);
 786 #ifdef SYSLOGD_WRLOCK
 787                 fl.l_type = F_UNLCK;
 788                 fcntl(log_file->fd, F_SETLKW, &fl);
 789 #endif
 790                 close(log_file->fd);
 791                 goto reopen;
 792         }
 793 /* TODO: what to do on write errors ("disk full")? */
 794         len = full_write(log_file->fd, msg, len);
 795         if (len > 0)
 796                 log_file->size += len;
 797 #else
 798         full_write(log_file->fd, msg, len);
 799 #endif
 800
 801 #ifdef SYSLOGD_WRLOCK
 802         fl.l_type = F_UNLCK;
 803         fcntl(log_file->fd, F_SETLKW, &fl);
 804 #endif
 805 }
 806
 807 static void parse_fac_prio_20(int pri, char *res20)
 808 {
 809         const CODE *c_pri, *c_fac;
 810
 811         c_fac = find_by_val(LOG_FAC(pri) << 3, bb_facilitynames);
 812         if (c_fac) {
 813                 c_pri = find_by_val(LOG_PRI(pri), bb_prioritynames);
 814                 if (c_pri) {
 815                         snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
 816                         return;
 817                 }
 818         }
 819         snprintf(res20, 20, "<%d>", pri);
 820 }
 821
 822 /* len parameter is used only for "is there a timestamp?" check.
 823  * NB: some callers cheat and supply len==0 when they know
 824  * that there is no timestamp, short-circuiting the test. */
 825 static void timestamp_and_log(int pri, char *msg, int len)
 826 {
 827         char *timestamp = NULL;
 828         time_t now;
 829
 830         /* Jan 18 00:11:22 msg... */
 831         /* 01234567890123456 */
 832         if (len >= 16 && msg[3] == ' ' && msg[6] == ' '
 833          && msg[9] == ':' && msg[12] == ':' && msg[15] == ' '
 834         ) {
 835                 if (!(option_mask32 & OPT_timestamp)) {
 836                         /* use message timestamp */
 837                         timestamp = msg;
 838                         now = 0;
 839                 }
 840                 msg += 16;
 841         }
 842
 843 #if ENABLE_FEATURE_SYSLOGD_PRECISE_TIMESTAMPS
 844         if (!timestamp) {
 845                 struct timeval tv;
 846                 gettimeofday(&tv, NULL);
 847                 now = tv.tv_sec;
 848                 timestamp = ctime(&now) + 4; /* skip day of week */
 849                 /* overwrite year by milliseconds, zero terminate */
 850                 sprintf(timestamp + 15, ".%03u", (unsigned)tv.tv_usec / 1000u);
 851         } else {
 852                 timestamp[15] = '\0';
 853         }
 854 #else
 855         if (!timestamp) {
 856                 time(&now);
 857                 timestamp = ctime(&now) + 4; /* skip day of week */
 858         }
 859         timestamp[15] = '\0';
 860 #endif
 861
 862         if (option_mask32 & OPT_kmsg) {
 863                 log_to_kmsg(pri, msg);
 864                 return;
 865         }
 866
 867         if (option_mask32 & OPT_small)
 868                 sprintf(G.printbuf, "%s %s\n", timestamp, msg);
 869         else {
 870                 char res[20];
 871                 parse_fac_prio_20(pri, res);
 872                 sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
 873         }
 874
 875         /* Log message locally (to file or shared mem) */
 876 #if ENABLE_FEATURE_SYSLOGD_CFG
 877         {
 878                 bool match = 0;
 879                 logRule_t *rule;
 880                 uint8_t facility = LOG_FAC(pri);
 881                 uint8_t prio_bit = 1 << LOG_PRI(pri);
 882
 883                 for (rule = G.log_rules; rule; rule = rule->next) {
 884                         if (rule->enabled_facility_priomap[facility] & prio_bit) {
 885                                 log_locally(now, G.printbuf, rule->file);
 886                                 match = 1;
 887                         }
 888                 }
 889                 if (match)
 890                         return;
 891         }
 892 #endif
 893         if (LOG_PRI(pri) < G.logLevel) {
 894 #if ENABLE_FEATURE_IPC_SYSLOG
 895                 if ((option_mask32 & OPT_circularlog) && G.shbuf) {
 896                         log_to_shmem(G.printbuf);
 897                         return;
 898                 }
 899 #endif
 900                 log_locally(now, G.printbuf, &G.logFile);
 901         }
 902 }
 903
 904 static void timestamp_and_log_internal(const char *msg)
 905 {
 906         /* -L, or no -R */
 907         if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
 908                 return;
 909         timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
 910 }
 911
 912 /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
 913  * embedded NULs. Split messages on each of these NULs, parse prio,
 914  * escape control chars and log each locally. */
 915 static void split_escape_and_log(char *tmpbuf, int len)
 916 {
 917         char *p = tmpbuf;
 918
 919         tmpbuf += len;
 920         while (p < tmpbuf) {
 921                 char c;
 922                 char *q = G.parsebuf;
 923                 int pri = (LOG_USER | LOG_NOTICE);
 924
 925                 if (*p == '<') {
 926                         /* Parse the magic priority number */
 927                         pri = bb_strtou(p + 1, &p, 10);
 928                         if (*p == '>')
 929                                 p++;
 930                         if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
 931                                 pri = (LOG_USER | LOG_NOTICE);
 932                 }
 933
 934                 while ((c = *p++)) {
 935                         if (c == '\n')
 936                                 c = ' ';
 937                         if (!(c & ~0x1f) && c != '\t') {
 938                                 *q++ = '^';
 939                                 c += '@'; /* ^@, ^A, ^B... */
 940                         }
 941                         *q++ = c;
 942                 }
 943                 *q = '\0';
 944
 945                 /* Now log it */
 946                 timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
 947         }
 948 }
 949
 950 #ifdef SYSLOGD_MARK
 951 static void do_mark(int sig)
 952 {
 953         if (G.markInterval) {
 954                 timestamp_and_log_internal("-- MARK --");
 955                 alarm(G.markInterval);
 956         }
 957 }
 958 #endif
 959
 960 /* Don't inline: prevent struct sockaddr_un to take up space on stack
 961  * permanently */
 962 static NOINLINE int create_socket(void)
 963 {
 964         struct sockaddr_un sunx;
 965         int sock_fd;
 966         char *dev_log_name;
 967
 968         memset(&sunx, 0, sizeof(sunx));
 969         sunx.sun_family = AF_UNIX;
 970
 971         /* Unlink old /dev/log or object it points to. */
 972         /* (if it exists, bind will fail) */
 973         strcpy(sunx.sun_path, _PATH_LOG);
 974         dev_log_name = xmalloc_follow_symlinks(_PATH_LOG);
 975         if (dev_log_name) {
 976                 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
 977                 free(dev_log_name);
 978         }
 979         unlink(sunx.sun_path);
 980
 981         sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
 982         xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
 983         chmod(_PATH_LOG, 0666);
 984
 985         return sock_fd;
 986 }
 987
 988 #if ENABLE_FEATURE_REMOTE_LOG
 989 static int try_to_resolve_remote(remoteHost_t *rh)
 990 {
 991         if (!rh->remoteAddr) {
 992                 unsigned now = monotonic_sec();
 993
 994                 /* Don't resolve name too often - DNS timeouts can be big */
 995                 if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
 996                         return -1;
 997                 rh->last_dns_resolve = now;
 998                 rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
 999                 if (!rh->remoteAddr)
1000                         return -1;
1001         }
1002         return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
1003 }
1004 #endif
1005
1006 static void do_syslogd(void) NORETURN;
1007 static void do_syslogd(void)
1008 {
1009 #if ENABLE_FEATURE_REMOTE_LOG
1010         llist_t *item;
1011 #endif
1012 #if ENABLE_FEATURE_SYSLOGD_DUP
1013         int last_sz = -1;
1014         char *last_buf;
1015         char *recvbuf = G.recvbuf;
1016 #else
1017 #define recvbuf (G.recvbuf)
1018 #endif
1019
1020         /* Set up signal handlers (so that they interrupt read()) */
1021         signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
1022         signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
1023         //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
1024         signal(SIGHUP, SIG_IGN);
1025 #ifdef SYSLOGD_MARK
1026         signal(SIGALRM, do_mark);
1027         alarm(G.markInterval);
1028 #endif
1029         xmove_fd(create_socket(), STDIN_FILENO);
1030
1031         if (option_mask32 & OPT_circularlog)
1032                 ipcsyslog_init();
1033
1034         if (option_mask32 & OPT_kmsg)
1035                 kmsg_init();
1036
1037         timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
1038
1039         while (!bb_got_signal) {
1040                 ssize_t sz;
1041
1042 #if ENABLE_FEATURE_SYSLOGD_DUP
1043                 last_buf = recvbuf;
1044                 if (recvbuf == G.recvbuf)
1045                         recvbuf = G.recvbuf + MAX_READ;
1046                 else
1047                         recvbuf = G.recvbuf;
1048 #endif
1049  read_again:
1050                 sz = read(STDIN_FILENO, recvbuf, MAX_READ - 1);
1051                 if (sz < 0) {
1052                         if (!bb_got_signal)
1053                                 bb_perror_msg("read from %s", _PATH_LOG);
1054                         break;
1055                 }
1056
1057                 /* Drop trailing '\n' and NULs (typically there is one NUL) */
1058                 while (1) {
1059                         if (sz == 0)
1060                                 goto read_again;
1061                         /* man 3 syslog says: "A trailing newline is added when needed".
1062                          * However, neither glibc nor uclibc do this:
1063                          * syslog(prio, "test")   sends "test\0" to /dev/log,
1064                          * syslog(prio, "test\n") sends "test\n\0".
1065                          * IOW: newline is passed verbatim!
1066                          * I take it to mean that it's syslogd's job
1067                          * to make those look identical in the log files. */
1068                         if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
1069                                 break;
1070                         sz--;
1071                 }
1072 #if ENABLE_FEATURE_SYSLOGD_DUP
1073                 if ((option_mask32 & OPT_dup) && (sz == last_sz))
1074                         if (memcmp(last_buf, recvbuf, sz) == 0)
1075                                 continue;
1076                 last_sz = sz;
1077 #endif
1078 #if ENABLE_FEATURE_REMOTE_LOG
1079                 /* Stock syslogd sends it '\n'-terminated
1080                  * over network, mimic that */
1081                 recvbuf[sz] = '\n';
1082
1083                 /* We are not modifying log messages in any way before send */
1084                 /* Remote site cannot trust _us_ anyway and need to do validation again */
1085                 for (item = G.remoteHosts; item != NULL; item = item->link) {
1086                         remoteHost_t *rh = (remoteHost_t *)item->data;
1087
1088                         if (rh->remoteFD == -1) {
1089                                 rh->remoteFD = try_to_resolve_remote(rh);
1090                                 if (rh->remoteFD == -1)
1091                                         continue;
1092                         }
1093
1094                         /* Send message to remote logger.
1095                          * On some errors, close and set remoteFD to -1
1096                          * so that DNS resolution is retried.
1097                          */
1098                         if (sendto(rh->remoteFD, recvbuf, sz+1,
1099                                         MSG_DONTWAIT | MSG_NOSIGNAL,
1100                                         &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
1101                         ) {
1102                                 switch (errno) {
1103                                 case ECONNRESET:
1104                                 case ENOTCONN: /* paranoia */
1105                                 case EPIPE:
1106                                         close(rh->remoteFD);
1107                                         rh->remoteFD = -1;
1108                                         free(rh->remoteAddr);
1109                                         rh->remoteAddr = NULL;
1110                                 }
1111                         }
1112                 }
1113 #endif
1114                 if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
1115                         recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
1116                         split_escape_and_log(recvbuf, sz);
1117                 }
1118         } /* while (!bb_got_signal) */
1119
1120         timestamp_and_log_internal("syslogd exiting");
1121         remove_pidfile_std_path_and_ext("syslogd");
1122         ipcsyslog_cleanup();
1123         if (option_mask32 & OPT_kmsg)
1124                 kmsg_cleanup();
1125         kill_myself_with_sig(bb_got_signal);
1126 #undef recvbuf
1127 }
1128
1129 int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1130 int syslogd_main(int argc UNUSED_PARAM, char **argv)
1131 {
1132         int opts;
1133         char OPTION_DECL;
1134 #if ENABLE_FEATURE_REMOTE_LOG
1135         llist_t *remoteAddrList = NULL;
1136 #endif
1137
1138         INIT_G();
1139
1140         /* No non-option params */
1141         opts = getopt32(argv, "^"OPTION_STR"\0""=0", OPTION_PARAM);
1142 #if ENABLE_FEATURE_REMOTE_LOG
1143         while (remoteAddrList) {
1144                 remoteHost_t *rh = xzalloc(sizeof(*rh));
1145                 rh->remoteHostname = llist_pop(&remoteAddrList);
1146                 rh->remoteFD = -1;
1147                 rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
1148                 llist_add_to(&G.remoteHosts, rh);
1149         }
1150 #endif
1151
1152 #ifdef SYSLOGD_MARK
1153         if (opts & OPT_mark) // -m
1154                 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
1155 #endif
1156         //if (opts & OPT_nofork) // -n
1157         //if (opts & OPT_outfile) // -O
1158         if (opts & OPT_loglevel) // -l
1159                 G.logLevel = xatou_range(opt_l, 1, 8);
1160         //if (opts & OPT_small) // -S
1161 #if ENABLE_FEATURE_ROTATE_LOGFILE
1162         if (opts & OPT_filesize) // -s
1163                 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
1164         if (opts & OPT_rotatecnt) // -b
1165                 G.logFileRotate = xatou_range(opt_b, 0, 99);
1166 #endif
1167 #if ENABLE_FEATURE_IPC_SYSLOG
1168         if (opt_C) // -Cn
1169                 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
1170 #endif
1171         /* If they have not specified remote logging, then log locally */
1172         if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
1173                 option_mask32 |= OPT_locallog;
1174 #if ENABLE_FEATURE_SYSLOGD_CFG
1175         parse_syslogdcfg(opt_f);
1176 #endif
1177
1178         /* Store away localhost's name before the fork */
1179         G.hostname = safe_gethostname();
1180         *strchrnul(G.hostname, '.') = '\0';
1181
1182         if (!(opts & OPT_nofork)) {
1183                 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
1184         }
1185
1186         //umask(0); - why??
1187         write_pidfile_std_path_and_ext("syslogd");
1188
1189         do_syslogd();
1190         /* return EXIT_SUCCESS; */
1191 }
1192
1193 /* Clean up. Needed because we are included from syslogd_and_logger.c */
1194 #undef DEBUG
1195 #undef SYSLOGD_MARK
1196 #undef SYSLOGD_WRLOCK
1197 #undef G
1198 #undef GLOBALS
1199 #undef INIT_G
1200 #undef OPTION_STR
1201 #undef OPTION_DECL
1202 #undef OPTION_PARAM