1 /* vi: set sw=4 ts=4: */
3 * Mini syslogd implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
9 * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
11 * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
13 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
16 //usage:#define syslogd_trivial_usage
18 //usage:#define syslogd_full_usage "\n\n"
19 //usage: "System logging utility\n"
20 //usage: IF_NOT_FEATURE_SYSLOGD_CFG(
21 //usage: "(this version of syslogd ignores /etc/syslog.conf)\n"
23 //usage: "\n -n Run in foreground"
24 //usage: "\n -O FILE Log to FILE (default:/var/log/messages)"
25 //usage: "\n -l N Log only messages more urgent than prio N (1-8)"
26 //usage: "\n -S Smaller output"
27 //usage: IF_FEATURE_ROTATE_LOGFILE(
28 //usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
29 //usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
31 //usage: IF_FEATURE_REMOTE_LOG(
32 //usage: "\n -R HOST[:PORT] Log to IP or hostname on PORT (default PORT=514/UDP)"
33 //usage: "\n -L Log locally and via network (default is network only if -R)"
35 //usage: IF_FEATURE_SYSLOGD_DUP(
36 //usage: "\n -D Drop duplicates"
38 //usage: IF_FEATURE_IPC_SYSLOG(
39 /* NB: -Csize shouldn't have space (because size is optional) */
40 //usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
42 //usage: IF_FEATURE_SYSLOGD_CFG(
43 //usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
45 /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
47 //usage:#define syslogd_example_usage
48 //usage: "$ syslogd -R masterlog:514\n"
49 //usage: "$ syslogd -R 192.168.1.1:601\n"
52 * Done in syslogd_and_logger.c:
55 #define SYSLOG_NAMES_CONST
62 #if ENABLE_FEATURE_REMOTE_LOG
63 #include <netinet/in.h>
66 #if ENABLE_FEATURE_IPC_SYSLOG
75 /* MARK code is not very useful, is bloat, and broken:
76 * can deadlock if alarmed to make MARK while writing to IPC buffer
77 * (semaphores are down but do_mark routine tries to down them again) */
80 /* Write locking does not seem to be useful either */
84 MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
85 DNS_WAIT_SEC = 2 * 60,
88 /* Semaphore operation structures */
90 int32_t size; /* size of data - 1 */
91 int32_t tail; /* end of message list */
92 char data[1]; /* data/messages */
95 #if ENABLE_FEATURE_REMOTE_LOG
98 unsigned last_dns_resolve;
99 len_and_sockaddr *remoteAddr;
100 const char *remoteHostname;
104 typedef struct logFile_t {
107 #if ENABLE_FEATURE_ROTATE_LOGFILE
113 #if ENABLE_FEATURE_SYSLOGD_CFG
114 typedef struct logRule_t {
115 uint8_t enabled_facility_priomap[LOG_NFACILITIES];
116 struct logFile_t *file;
117 struct logRule_t *next;
121 /* Allows us to have smaller initializer. Ugly. */
124 /* interval between marks in seconds */ \
125 /*int markInterval;*/ \
126 /* level of messages to be logged */ \
128 IF_FEATURE_ROTATE_LOGFILE( \
129 /* max size of file before rotation */ \
130 unsigned logFileSize; \
131 /* number of rotated message files */ \
132 unsigned logFileRotate; \
134 IF_FEATURE_IPC_SYSLOG( \
135 int shmid; /* ipc shared memory id */ \
136 int s_semid; /* ipc semaphore id */ \
138 struct sembuf SMwup[1]; \
139 struct sembuf SMwdn[3]; \
141 IF_FEATURE_SYSLOGD_CFG( \
142 logRule_t *log_rules; \
145 struct init_globals {
152 #if ENABLE_FEATURE_REMOTE_LOG
153 llist_t *remoteHosts;
155 #if ENABLE_FEATURE_IPC_SYSLOG
156 struct shbuf_ds *shbuf;
158 time_t last_log_time;
159 /* localhost's name. We print only first 64 chars */
162 /* We recv into recvbuf... */
163 char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
164 /* ...then copy to parsebuf, escaping control chars */
165 /* (can grow x2 max) */
166 char parsebuf[MAX_READ*2];
167 /* ...then sprintf into printbuf, adding timestamp (15 chars),
168 * host (64), fac.prio (20) to the message */
169 /* (growth by: 15 + 64 + 20 + delims = ~110) */
170 char printbuf[MAX_READ*2 + 128];
173 static const struct init_globals init_data = {
175 .path = "/var/log/messages",
179 .markInterval = 20 * 60,
182 #if ENABLE_FEATURE_ROTATE_LOGFILE
183 .logFileSize = 200 * 1024,
186 #if ENABLE_FEATURE_IPC_SYSLOG
189 .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
190 .SMwup = { {1, -1, IPC_NOWAIT} },
191 .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
195 #define G (*ptr_to_globals)
196 #define INIT_G() do { \
197 SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
203 OPTBIT_mark = 0, // -m
205 OPTBIT_outfile, // -O
206 OPTBIT_loglevel, // -l
208 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
209 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
210 IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
211 IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
212 IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
213 IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
214 IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
216 OPT_mark = 1 << OPTBIT_mark ,
217 OPT_nofork = 1 << OPTBIT_nofork ,
218 OPT_outfile = 1 << OPTBIT_outfile ,
219 OPT_loglevel = 1 << OPTBIT_loglevel,
220 OPT_small = 1 << OPTBIT_small ,
221 OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
222 OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
223 OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
224 OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
225 OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
226 OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
227 OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
229 #define OPTION_STR "m:nO:l:S" \
230 IF_FEATURE_ROTATE_LOGFILE("s:" ) \
231 IF_FEATURE_ROTATE_LOGFILE("b:" ) \
232 IF_FEATURE_REMOTE_LOG( "R:" ) \
233 IF_FEATURE_REMOTE_LOG( "L" ) \
234 IF_FEATURE_IPC_SYSLOG( "C::") \
235 IF_FEATURE_SYSLOGD_DUP( "D" ) \
236 IF_FEATURE_SYSLOGD_CFG( "f:" )
237 #define OPTION_DECL *opt_m, *opt_l \
238 IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
239 IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
240 IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
241 IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
242 #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
243 IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
244 IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
245 IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
246 IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
247 IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
250 #if ENABLE_FEATURE_SYSLOGD_CFG
251 static const CODE* find_by_name(char *name, const CODE* c_set)
253 for (; c_set->c_name; c_set++) {
254 if (strcmp(name, c_set->c_name) == 0)
260 static const CODE* find_by_val(int val, const CODE* c_set)
262 for (; c_set->c_name; c_set++) {
263 if (c_set->c_val == val)
269 #if ENABLE_FEATURE_SYSLOGD_CFG
270 static void parse_syslogdcfg(const char *file)
274 /* tok[0] set of selectors */
275 /* tok[1] file name */
276 /* tok[2] has to be NULL */
280 parser = config_open2(file ? file : "/etc/syslog.conf",
281 file ? xfopen_for_read : fopen_for_read);
283 /* didn't find default /etc/syslog.conf */
284 /* proceed as if we built busybox without config support */
287 /* use ptr to ptr to avoid checking whether head was initialized */
288 pp_rule = &G.log_rules;
289 /* iterate through lines of config, skipping comments */
290 while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
294 /* unexpected trailing token? */
298 cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
300 cur_selector = tok[0];
301 /* iterate through selectors: "kern.info;kern.!err;..." */
305 uint8_t negated_prio; /* "kern.!err" */
306 uint8_t single_prio; /* "kern.=err" */
307 uint32_t facmap; /* bitmap of enabled facilities */
308 uint8_t primap; /* bitmap of enabled priorities */
311 next_selector = strchr(cur_selector, ';');
313 *next_selector++ = '\0';
315 t = strchr(cur_selector, '.');
318 *t++ = '\0'; /* separate facility from priority */
333 primap = 0xff; /* all 8 log levels enabled */
336 code = find_by_name(t, prioritynames);
340 priority = code->c_val;
341 if (priority == INTERNAL_NOPRI) {
342 /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
345 priority = 1 << priority;
358 if (*cur_selector == '*')
359 facmap = (1<<LOG_NFACILITIES) - 1;
364 /* iterate through facilities: "kern,daemon.<priospec>" */
366 next_facility = strchr(t, ',');
368 *next_facility++ = '\0';
369 code = find_by_name(t, facilitynames);
372 /* "mark" is not a real facility, skip it */
373 if (code->c_val != INTERNAL_MARK)
374 facmap |= 1<<(LOG_FAC(code->c_val));
379 /* merge result with previous selectors */
380 for (i = 0; i < LOG_NFACILITIES; ++i) {
381 if (!(facmap & (1<<i)))
384 cur_rule->enabled_facility_priomap[i] &= primap;
386 cur_rule->enabled_facility_priomap[i] |= primap;
389 cur_selector = next_selector;
390 } while (cur_selector);
392 /* check whether current file name was mentioned in previous rules or
393 * as global logfile (G.logFile).
395 if (strcmp(G.logFile.path, tok[1]) == 0) {
396 cur_rule->file = &G.logFile;
399 /* temporarily use cur_rule as iterator, but *pp_rule still points
400 * to currently processing rule entry.
401 * NOTE: *pp_rule points to the current (and last in the list) rule.
403 for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
404 if (strcmp(cur_rule->file->path, tok[1]) == 0) {
405 /* found - reuse the same file structure */
406 (*pp_rule)->file = cur_rule->file;
411 cur_rule->file = xzalloc(sizeof(*cur_rule->file));
412 cur_rule->file->fd = -1;
413 cur_rule->file->path = xstrdup(tok[1]);
415 pp_rule = &cur_rule->next;
417 config_close(parser);
421 bb_error_msg_and_die("error in '%s' at line %d", file, parser->lineno);
425 /* circular buffer variables/structures */
426 #if ENABLE_FEATURE_IPC_SYSLOG
428 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
429 #error Sorry, you must set the syslogd buffer size to at least 4KB.
430 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
433 /* our shared key (syslogd.c and logread.c must be in sync) */
434 enum { KEY_ID = 0x414e4547 }; /* "GENA" */
436 static void ipcsyslog_cleanup(void)
442 shmctl(G.shmid, IPC_RMID, NULL);
444 if (G.s_semid != -1) {
445 semctl(G.s_semid, 0, IPC_RMID, 0);
449 static void ipcsyslog_init(void)
452 printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
454 G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
456 bb_perror_msg_and_die("shmget");
459 G.shbuf = shmat(G.shmid, NULL, 0);
460 if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
461 bb_perror_msg_and_die("shmat");
464 memset(G.shbuf, 0, G.shm_size);
465 G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
466 /*G.shbuf->tail = 0;*/
468 /* we'll trust the OS to set initial semval to 0 (let's hope) */
469 G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
470 if (G.s_semid == -1) {
471 if (errno == EEXIST) {
472 G.s_semid = semget(KEY_ID, 2, 0);
476 bb_perror_msg_and_die("semget");
480 /* Write message to shared mem buffer */
481 static void log_to_shmem(const char *msg)
483 int old_tail, new_tail;
486 if (semop(G.s_semid, G.SMwdn, 3) == -1) {
487 bb_perror_msg_and_die("SMwdn");
490 /* Circular Buffer Algorithm:
491 * --------------------------
492 * tail == position where to store next syslog message.
493 * tail's max value is (shbuf->size - 1)
494 * Last byte of buffer is never used and remains NUL.
496 len = strlen(msg) + 1; /* length with NUL included */
498 old_tail = G.shbuf->tail;
499 new_tail = old_tail + len;
500 if (new_tail < G.shbuf->size) {
501 /* store message, set new tail */
502 memcpy(G.shbuf->data + old_tail, msg, len);
503 G.shbuf->tail = new_tail;
505 /* k == available buffer space ahead of old tail */
506 int k = G.shbuf->size - old_tail;
507 /* copy what fits to the end of buffer, and repeat */
508 memcpy(G.shbuf->data + old_tail, msg, k);
514 if (semop(G.s_semid, G.SMwup, 1) == -1) {
515 bb_perror_msg_and_die("SMwup");
518 printf("tail:%d\n", G.shbuf->tail);
521 void ipcsyslog_cleanup(void);
522 void ipcsyslog_init(void);
523 void log_to_shmem(const char *msg);
524 #endif /* FEATURE_IPC_SYSLOG */
526 /* Print a message to the log file. */
527 static void log_locally(time_t now, char *msg, logFile_t *log_file)
529 #ifdef SYSLOGD_WRLOCK
532 int len = strlen(msg);
534 if (log_file->fd >= 0) {
535 /* Reopen log file every second. This allows admin
536 * to delete the file and not worry about restarting us.
537 * This costs almost nothing since it happens
538 * _at most_ once a second.
542 if (G.last_log_time != now) {
543 G.last_log_time = now;
549 log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
550 | O_NOCTTY | O_APPEND | O_NONBLOCK,
552 if (log_file->fd < 0) {
553 /* cannot open logfile? - print to /dev/console then */
554 int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
556 fd = 2; /* then stderr, dammit */
557 full_write(fd, msg, len);
562 #if ENABLE_FEATURE_ROTATE_LOGFILE
565 log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
566 /* bug (mostly harmless): can wrap around if file > 4gb */
567 log_file->size = statf.st_size;
572 #ifdef SYSLOGD_WRLOCK
573 fl.l_whence = SEEK_SET;
577 fcntl(log_file->fd, F_SETLKW, &fl);
580 #if ENABLE_FEATURE_ROTATE_LOGFILE
581 if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
582 if (G.logFileRotate) { /* always 0..99 */
583 int i = strlen(log_file->path) + 3 + 1;
586 i = G.logFileRotate - 1;
587 /* rename: f.8 -> f.9; f.7 -> f.8; ... */
589 sprintf(newFile, "%s.%d", log_file->path, i);
591 sprintf(oldFile, "%s.%d", log_file->path, --i);
592 /* ignore errors - file might be missing */
593 rename(oldFile, newFile);
595 /* newFile == "f.0" now */
596 rename(log_file->path, newFile);
597 /* Incredibly, if F and F.0 are hardlinks, POSIX
598 * _demands_ that rename returns 0 but does not
600 * (hardlinked F/F.0 pair was observed after
601 * power failure during rename()).
602 * Ensure old file is gone:
604 unlink(log_file->path);
605 #ifdef SYSLOGD_WRLOCK
607 fcntl(log_file->fd, F_SETLKW, &fl);
612 ftruncate(log_file->fd, 0);
616 full_write(log_file->fd, msg, len);
617 #ifdef SYSLOGD_WRLOCK
619 fcntl(log_file->fd, F_SETLKW, &fl);
623 static void parse_fac_prio_20(int pri, char *res20)
625 const CODE *c_pri, *c_fac;
627 c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
629 c_pri = find_by_val(LOG_PRI(pri), prioritynames);
631 snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
635 snprintf(res20, 20, "<%d>", pri);
638 /* len parameter is used only for "is there a timestamp?" check.
639 * NB: some callers cheat and supply len==0 when they know
640 * that there is no timestamp, short-circuiting the test. */
641 static void timestamp_and_log(int pri, char *msg, int len)
646 /* Jan 18 00:11:22 msg... */
647 /* 01234567890123456 */
648 if (len < 16 || msg[3] != ' ' || msg[6] != ' '
649 || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
652 timestamp = ctime(&now) + 4; /* skip day of week */
658 timestamp[15] = '\0';
660 if (option_mask32 & OPT_small)
661 sprintf(G.printbuf, "%s %s\n", timestamp, msg);
664 parse_fac_prio_20(pri, res);
665 sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
668 /* Log message locally (to file or shared mem) */
669 #if ENABLE_FEATURE_SYSLOGD_CFG
673 uint8_t facility = LOG_FAC(pri);
674 uint8_t prio_bit = 1 << LOG_PRI(pri);
676 for (rule = G.log_rules; rule; rule = rule->next) {
677 if (rule->enabled_facility_priomap[facility] & prio_bit) {
678 log_locally(now, G.printbuf, rule->file);
686 if (LOG_PRI(pri) < G.logLevel) {
687 #if ENABLE_FEATURE_IPC_SYSLOG
688 if ((option_mask32 & OPT_circularlog) && G.shbuf) {
689 log_to_shmem(G.printbuf);
693 log_locally(now, G.printbuf, &G.logFile);
697 static void timestamp_and_log_internal(const char *msg)
700 if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
702 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
705 /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
706 * embedded NULs. Split messages on each of these NULs, parse prio,
707 * escape control chars and log each locally. */
708 static void split_escape_and_log(char *tmpbuf, int len)
715 char *q = G.parsebuf;
716 int pri = (LOG_USER | LOG_NOTICE);
719 /* Parse the magic priority number */
720 pri = bb_strtou(p + 1, &p, 10);
723 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
724 pri = (LOG_USER | LOG_NOTICE);
730 if (!(c & ~0x1f) && c != '\t') {
732 c += '@'; /* ^@, ^A, ^B... */
739 timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
744 static void do_mark(int sig)
746 if (G.markInterval) {
747 timestamp_and_log_internal("-- MARK --");
748 alarm(G.markInterval);
753 /* Don't inline: prevent struct sockaddr_un to take up space on stack
755 static NOINLINE int create_socket(void)
757 struct sockaddr_un sunx;
761 #if ENABLE_FEATURE_SYSTEMD
762 if (sd_listen_fds() == 1)
763 return SD_LISTEN_FDS_START;
766 memset(&sunx, 0, sizeof(sunx));
767 sunx.sun_family = AF_UNIX;
769 /* Unlink old /dev/log or object it points to. */
770 /* (if it exists, bind will fail) */
771 strcpy(sunx.sun_path, "/dev/log");
772 dev_log_name = xmalloc_follow_symlinks("/dev/log");
774 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
777 unlink(sunx.sun_path);
779 sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
780 xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
781 chmod("/dev/log", 0666);
786 #if ENABLE_FEATURE_REMOTE_LOG
787 static int try_to_resolve_remote(remoteHost_t *rh)
789 if (!rh->remoteAddr) {
790 unsigned now = monotonic_sec();
792 /* Don't resolve name too often - DNS timeouts can be big */
793 if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
795 rh->last_dns_resolve = now;
796 rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
800 return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
804 static void do_syslogd(void) NORETURN;
805 static void do_syslogd(void)
808 #if ENABLE_FEATURE_REMOTE_LOG
811 #if ENABLE_FEATURE_SYSLOGD_DUP
814 char *recvbuf = G.recvbuf;
816 #define recvbuf (G.recvbuf)
819 /* Set up signal handlers (so that they interrupt read()) */
820 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
821 signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
822 //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
823 signal(SIGHUP, SIG_IGN);
825 signal(SIGALRM, do_mark);
826 alarm(G.markInterval);
828 sock_fd = create_socket();
830 if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) {
834 timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
836 while (!bb_got_signal) {
839 #if ENABLE_FEATURE_SYSLOGD_DUP
841 if (recvbuf == G.recvbuf)
842 recvbuf = G.recvbuf + MAX_READ;
847 sz = read(sock_fd, recvbuf, MAX_READ - 1);
850 bb_perror_msg("read from /dev/log");
854 /* Drop trailing '\n' and NULs (typically there is one NUL) */
858 /* man 3 syslog says: "A trailing newline is added when needed".
859 * However, neither glibc nor uclibc do this:
860 * syslog(prio, "test") sends "test\0" to /dev/log,
861 * syslog(prio, "test\n") sends "test\n\0".
862 * IOW: newline is passed verbatim!
863 * I take it to mean that it's syslogd's job
864 * to make those look identical in the log files. */
865 if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
869 #if ENABLE_FEATURE_SYSLOGD_DUP
870 if ((option_mask32 & OPT_dup) && (sz == last_sz))
871 if (memcmp(last_buf, recvbuf, sz) == 0)
875 #if ENABLE_FEATURE_REMOTE_LOG
876 /* Stock syslogd sends it '\n'-terminated
877 * over network, mimic that */
880 /* We are not modifying log messages in any way before send */
881 /* Remote site cannot trust _us_ anyway and need to do validation again */
882 for (item = G.remoteHosts; item != NULL; item = item->link) {
883 remoteHost_t *rh = (remoteHost_t *)item->data;
885 if (rh->remoteFD == -1) {
886 rh->remoteFD = try_to_resolve_remote(rh);
887 if (rh->remoteFD == -1)
891 /* Send message to remote logger.
892 * On some errors, close and set remoteFD to -1
893 * so that DNS resolution is retried.
895 if (sendto(rh->remoteFD, recvbuf, sz+1,
896 MSG_DONTWAIT | MSG_NOSIGNAL,
897 &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
901 case ENOTCONN: /* paranoia */
905 free(rh->remoteAddr);
906 rh->remoteAddr = NULL;
911 if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
912 recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
913 split_escape_and_log(recvbuf, sz);
915 } /* while (!bb_got_signal) */
917 timestamp_and_log_internal("syslogd exiting");
918 puts("syslogd exiting");
919 if (ENABLE_FEATURE_IPC_SYSLOG)
921 kill_myself_with_sig(bb_got_signal);
925 int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
926 int syslogd_main(int argc UNUSED_PARAM, char **argv)
930 #if ENABLE_FEATURE_REMOTE_LOG
931 llist_t *remoteAddrList = NULL;
936 /* No non-option params, -R can occur multiple times */
937 opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
938 opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
939 #if ENABLE_FEATURE_REMOTE_LOG
940 while (remoteAddrList) {
941 remoteHost_t *rh = xzalloc(sizeof(*rh));
942 rh->remoteHostname = llist_pop(&remoteAddrList);
944 rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
945 llist_add_to(&G.remoteHosts, rh);
950 if (opts & OPT_mark) // -m
951 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
953 //if (opts & OPT_nofork) // -n
954 //if (opts & OPT_outfile) // -O
955 if (opts & OPT_loglevel) // -l
956 G.logLevel = xatou_range(opt_l, 1, 8);
957 //if (opts & OPT_small) // -S
958 #if ENABLE_FEATURE_ROTATE_LOGFILE
959 if (opts & OPT_filesize) // -s
960 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
961 if (opts & OPT_rotatecnt) // -b
962 G.logFileRotate = xatou_range(opt_b, 0, 99);
964 #if ENABLE_FEATURE_IPC_SYSLOG
966 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
968 /* If they have not specified remote logging, then log locally */
969 if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
970 option_mask32 |= OPT_locallog;
971 #if ENABLE_FEATURE_SYSLOGD_CFG
972 parse_syslogdcfg(opt_f);
975 /* Store away localhost's name before the fork */
976 G.hostname = safe_gethostname();
977 *strchrnul(G.hostname, '.') = '\0';
979 if (!(opts & OPT_nofork)) {
980 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
983 write_pidfile("/var/run/syslogd.pid");
985 /* return EXIT_SUCCESS; */
988 /* Clean up. Needed because we are included from syslogd_and_logger.c */
991 #undef SYSLOGD_WRLOCK