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