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 HOST:PORT (default PORT:514)"
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)" */
46 //usage: IF_FEATURE_KMSG_SYSLOG(
47 //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
50 //usage:#define syslogd_example_usage
51 //usage: "$ syslogd -R masterlog:514\n"
52 //usage: "$ syslogd -R 192.168.1.1:601\n"
55 * Done in syslogd_and_logger.c:
58 #define SYSLOG_NAMES_CONST
65 #if ENABLE_FEATURE_REMOTE_LOG
66 #include <netinet/in.h>
69 #if ENABLE_FEATURE_IPC_SYSLOG
78 /* MARK code is not very useful, is bloat, and broken:
79 * can deadlock if alarmed to make MARK while writing to IPC buffer
80 * (semaphores are down but do_mark routine tries to down them again) */
83 /* Write locking does not seem to be useful either */
87 MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
88 DNS_WAIT_SEC = 2 * 60,
91 /* Semaphore operation structures */
93 int32_t size; /* size of data - 1 */
94 int32_t tail; /* end of message list */
95 char data[1]; /* data/messages */
98 #if ENABLE_FEATURE_REMOTE_LOG
101 unsigned last_dns_resolve;
102 len_and_sockaddr *remoteAddr;
103 const char *remoteHostname;
107 typedef struct logFile_t {
110 #if ENABLE_FEATURE_ROTATE_LOGFILE
116 #if ENABLE_FEATURE_SYSLOGD_CFG
117 typedef struct logRule_t {
118 uint8_t enabled_facility_priomap[LOG_NFACILITIES];
119 struct logFile_t *file;
120 struct logRule_t *next;
124 /* Allows us to have smaller initializer. Ugly. */
127 /* interval between marks in seconds */ \
128 /*int markInterval;*/ \
129 /* level of messages to be logged */ \
131 IF_FEATURE_ROTATE_LOGFILE( \
132 /* max size of file before rotation */ \
133 unsigned logFileSize; \
134 /* number of rotated message files */ \
135 unsigned logFileRotate; \
137 IF_FEATURE_IPC_SYSLOG( \
138 int shmid; /* ipc shared memory id */ \
139 int s_semid; /* ipc semaphore id */ \
141 struct sembuf SMwup[1]; \
142 struct sembuf SMwdn[3]; \
144 IF_FEATURE_SYSLOGD_CFG( \
145 logRule_t *log_rules; \
147 IF_FEATURE_KMSG_SYSLOG( \
152 struct init_globals {
159 #if ENABLE_FEATURE_REMOTE_LOG
160 llist_t *remoteHosts;
162 #if ENABLE_FEATURE_IPC_SYSLOG
163 struct shbuf_ds *shbuf;
165 time_t last_log_time;
166 /* localhost's name. We print only first 64 chars */
169 /* We recv into recvbuf... */
170 char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
171 /* ...then copy to parsebuf, escaping control chars */
172 /* (can grow x2 max) */
173 char parsebuf[MAX_READ*2];
174 /* ...then sprintf into printbuf, adding timestamp (15 chars),
175 * host (64), fac.prio (20) to the message */
176 /* (growth by: 15 + 64 + 20 + delims = ~110) */
177 char printbuf[MAX_READ*2 + 128];
180 static const struct init_globals init_data = {
182 .path = "/var/log/messages",
186 .markInterval = 20 * 60,
189 #if ENABLE_FEATURE_ROTATE_LOGFILE
190 .logFileSize = 200 * 1024,
193 #if ENABLE_FEATURE_IPC_SYSLOG
196 .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
197 .SMwup = { {1, -1, IPC_NOWAIT} },
198 .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
202 #define G (*ptr_to_globals)
203 #define INIT_G() do { \
204 SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
210 OPTBIT_mark = 0, // -m
212 OPTBIT_outfile, // -O
213 OPTBIT_loglevel, // -l
215 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
216 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
217 IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
218 IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
219 IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
220 IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
221 IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
222 IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
224 OPT_mark = 1 << OPTBIT_mark ,
225 OPT_nofork = 1 << OPTBIT_nofork ,
226 OPT_outfile = 1 << OPTBIT_outfile ,
227 OPT_loglevel = 1 << OPTBIT_loglevel,
228 OPT_small = 1 << OPTBIT_small ,
229 OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
230 OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
231 OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
232 OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
233 OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
234 OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
235 OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
236 OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
239 #define OPTION_STR "m:nO:l:S" \
240 IF_FEATURE_ROTATE_LOGFILE("s:" ) \
241 IF_FEATURE_ROTATE_LOGFILE("b:" ) \
242 IF_FEATURE_REMOTE_LOG( "R:" ) \
243 IF_FEATURE_REMOTE_LOG( "L" ) \
244 IF_FEATURE_IPC_SYSLOG( "C::") \
245 IF_FEATURE_SYSLOGD_DUP( "D" ) \
246 IF_FEATURE_SYSLOGD_CFG( "f:" ) \
247 IF_FEATURE_KMSG_SYSLOG( "K" )
248 #define OPTION_DECL *opt_m, *opt_l \
249 IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
250 IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
251 IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
252 IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
253 #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
254 IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
255 IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
256 IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
257 IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
258 IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
261 #if ENABLE_FEATURE_SYSLOGD_CFG
262 static const CODE* find_by_name(char *name, const CODE* c_set)
264 for (; c_set->c_name; c_set++) {
265 if (strcmp(name, c_set->c_name) == 0)
271 static const CODE* find_by_val(int val, const CODE* c_set)
273 for (; c_set->c_name; c_set++) {
274 if (c_set->c_val == val)
280 #if ENABLE_FEATURE_SYSLOGD_CFG
281 static void parse_syslogdcfg(const char *file)
285 /* tok[0] set of selectors */
286 /* tok[1] file name */
287 /* tok[2] has to be NULL */
291 parser = config_open2(file ? file : "/etc/syslog.conf",
292 file ? xfopen_for_read : fopen_for_read);
294 /* didn't find default /etc/syslog.conf */
295 /* proceed as if we built busybox without config support */
298 /* use ptr to ptr to avoid checking whether head was initialized */
299 pp_rule = &G.log_rules;
300 /* iterate through lines of config, skipping comments */
301 while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
305 /* unexpected trailing token? */
309 cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
311 cur_selector = tok[0];
312 /* iterate through selectors: "kern.info;kern.!err;..." */
316 uint8_t negated_prio; /* "kern.!err" */
317 uint8_t single_prio; /* "kern.=err" */
318 uint32_t facmap; /* bitmap of enabled facilities */
319 uint8_t primap; /* bitmap of enabled priorities */
322 next_selector = strchr(cur_selector, ';');
324 *next_selector++ = '\0';
326 t = strchr(cur_selector, '.');
329 *t++ = '\0'; /* separate facility from priority */
344 primap = 0xff; /* all 8 log levels enabled */
347 code = find_by_name(t, prioritynames);
351 priority = code->c_val;
352 if (priority == INTERNAL_NOPRI) {
353 /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
356 priority = 1 << priority;
369 if (*cur_selector == '*')
370 facmap = (1<<LOG_NFACILITIES) - 1;
375 /* iterate through facilities: "kern,daemon.<priospec>" */
377 next_facility = strchr(t, ',');
379 *next_facility++ = '\0';
380 code = find_by_name(t, facilitynames);
383 /* "mark" is not a real facility, skip it */
384 if (code->c_val != INTERNAL_MARK)
385 facmap |= 1<<(LOG_FAC(code->c_val));
390 /* merge result with previous selectors */
391 for (i = 0; i < LOG_NFACILITIES; ++i) {
392 if (!(facmap & (1<<i)))
395 cur_rule->enabled_facility_priomap[i] &= primap;
397 cur_rule->enabled_facility_priomap[i] |= primap;
400 cur_selector = next_selector;
401 } while (cur_selector);
403 /* check whether current file name was mentioned in previous rules or
404 * as global logfile (G.logFile).
406 if (strcmp(G.logFile.path, tok[1]) == 0) {
407 cur_rule->file = &G.logFile;
410 /* temporarily use cur_rule as iterator, but *pp_rule still points
411 * to currently processing rule entry.
412 * NOTE: *pp_rule points to the current (and last in the list) rule.
414 for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
415 if (strcmp(cur_rule->file->path, tok[1]) == 0) {
416 /* found - reuse the same file structure */
417 (*pp_rule)->file = cur_rule->file;
422 cur_rule->file = xzalloc(sizeof(*cur_rule->file));
423 cur_rule->file->fd = -1;
424 cur_rule->file->path = xstrdup(tok[1]);
426 pp_rule = &cur_rule->next;
428 config_close(parser);
432 bb_error_msg_and_die("error in '%s' at line %d",
433 file ? file : "/etc/syslog.conf",
438 /* circular buffer variables/structures */
439 #if ENABLE_FEATURE_IPC_SYSLOG
441 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
442 #error Sorry, you must set the syslogd buffer size to at least 4KB.
443 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
446 /* our shared key (syslogd.c and logread.c must be in sync) */
447 enum { KEY_ID = 0x414e4547 }; /* "GENA" */
449 static void ipcsyslog_cleanup(void)
455 shmctl(G.shmid, IPC_RMID, NULL);
457 if (G.s_semid != -1) {
458 semctl(G.s_semid, 0, IPC_RMID, 0);
462 static void ipcsyslog_init(void)
465 printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
467 G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
469 bb_perror_msg_and_die("shmget");
472 G.shbuf = shmat(G.shmid, NULL, 0);
473 if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
474 bb_perror_msg_and_die("shmat");
477 memset(G.shbuf, 0, G.shm_size);
478 G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
479 /*G.shbuf->tail = 0;*/
481 /* we'll trust the OS to set initial semval to 0 (let's hope) */
482 G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
483 if (G.s_semid == -1) {
484 if (errno == EEXIST) {
485 G.s_semid = semget(KEY_ID, 2, 0);
489 bb_perror_msg_and_die("semget");
493 /* Write message to shared mem buffer */
494 static void log_to_shmem(const char *msg)
496 int old_tail, new_tail;
499 if (semop(G.s_semid, G.SMwdn, 3) == -1) {
500 bb_perror_msg_and_die("SMwdn");
503 /* Circular Buffer Algorithm:
504 * --------------------------
505 * tail == position where to store next syslog message.
506 * tail's max value is (shbuf->size - 1)
507 * Last byte of buffer is never used and remains NUL.
509 len = strlen(msg) + 1; /* length with NUL included */
511 old_tail = G.shbuf->tail;
512 new_tail = old_tail + len;
513 if (new_tail < G.shbuf->size) {
514 /* store message, set new tail */
515 memcpy(G.shbuf->data + old_tail, msg, len);
516 G.shbuf->tail = new_tail;
518 /* k == available buffer space ahead of old tail */
519 int k = G.shbuf->size - old_tail;
520 /* copy what fits to the end of buffer, and repeat */
521 memcpy(G.shbuf->data + old_tail, msg, k);
527 if (semop(G.s_semid, G.SMwup, 1) == -1) {
528 bb_perror_msg_and_die("SMwup");
531 printf("tail:%d\n", G.shbuf->tail);
534 static void ipcsyslog_cleanup(void) {}
535 static void ipcsyslog_init(void) {}
536 void log_to_shmem(const char *msg);
537 #endif /* FEATURE_IPC_SYSLOG */
539 #if ENABLE_FEATURE_KMSG_SYSLOG
540 static void kmsg_init(void)
542 G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
545 * kernel < 3.5 expects single char printk KERN_* priority prefix,
546 * from 3.5 onwards the full syslog facility/priority format is supported
548 if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
549 G.primask = LOG_PRIMASK;
554 static void kmsg_cleanup(void)
556 if (ENABLE_FEATURE_CLEAN_UP)
560 /* Write message to /dev/kmsg */
561 static void log_to_kmsg(int pri, const char *msg)
564 * kernel < 3.5 expects single char printk KERN_* priority prefix,
565 * from 3.5 onwards the full syslog facility/priority format is supported
569 write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
572 static void kmsg_init(void) {}
573 static void kmsg_cleanup(void) {}
574 static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
575 #endif /* FEATURE_KMSG_SYSLOG */
577 /* Print a message to the log file. */
578 static void log_locally(time_t now, char *msg, logFile_t *log_file)
580 #ifdef SYSLOGD_WRLOCK
583 int len = strlen(msg);
585 if (log_file->fd >= 0) {
586 /* Reopen log file every second. This allows admin
587 * to delete the file and not worry about restarting us.
588 * This costs almost nothing since it happens
589 * _at most_ once a second.
593 if (G.last_log_time != now) {
594 G.last_log_time = now;
600 log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
601 | O_NOCTTY | O_APPEND | O_NONBLOCK,
603 if (log_file->fd < 0) {
604 /* cannot open logfile? - print to /dev/console then */
605 int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
607 fd = 2; /* then stderr, dammit */
608 full_write(fd, msg, len);
613 #if ENABLE_FEATURE_ROTATE_LOGFILE
616 log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
617 /* bug (mostly harmless): can wrap around if file > 4gb */
618 log_file->size = statf.st_size;
623 #ifdef SYSLOGD_WRLOCK
624 fl.l_whence = SEEK_SET;
628 fcntl(log_file->fd, F_SETLKW, &fl);
631 #if ENABLE_FEATURE_ROTATE_LOGFILE
632 if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
633 if (G.logFileRotate) { /* always 0..99 */
634 int i = strlen(log_file->path) + 3 + 1;
637 i = G.logFileRotate - 1;
638 /* rename: f.8 -> f.9; f.7 -> f.8; ... */
640 sprintf(newFile, "%s.%d", log_file->path, i);
642 sprintf(oldFile, "%s.%d", log_file->path, --i);
643 /* ignore errors - file might be missing */
644 rename(oldFile, newFile);
646 /* newFile == "f.0" now */
647 rename(log_file->path, newFile);
648 /* Incredibly, if F and F.0 are hardlinks, POSIX
649 * _demands_ that rename returns 0 but does not
651 * (hardlinked F/F.0 pair was observed after
652 * power failure during rename()).
653 * Ensure old file is gone:
655 unlink(log_file->path);
656 #ifdef SYSLOGD_WRLOCK
658 fcntl(log_file->fd, F_SETLKW, &fl);
663 ftruncate(log_file->fd, 0);
667 full_write(log_file->fd, msg, len);
668 #ifdef SYSLOGD_WRLOCK
670 fcntl(log_file->fd, F_SETLKW, &fl);
674 static void parse_fac_prio_20(int pri, char *res20)
676 const CODE *c_pri, *c_fac;
678 c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
680 c_pri = find_by_val(LOG_PRI(pri), prioritynames);
682 snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
686 snprintf(res20, 20, "<%d>", pri);
689 /* len parameter is used only for "is there a timestamp?" check.
690 * NB: some callers cheat and supply len==0 when they know
691 * that there is no timestamp, short-circuiting the test. */
692 static void timestamp_and_log(int pri, char *msg, int len)
697 /* Jan 18 00:11:22 msg... */
698 /* 01234567890123456 */
699 if (len < 16 || msg[3] != ' ' || msg[6] != ' '
700 || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
703 timestamp = ctime(&now) + 4; /* skip day of week */
709 timestamp[15] = '\0';
711 if (option_mask32 & OPT_kmsg) {
712 log_to_kmsg(pri, msg);
716 if (option_mask32 & OPT_small)
717 sprintf(G.printbuf, "%s %s\n", timestamp, msg);
720 parse_fac_prio_20(pri, res);
721 sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
724 /* Log message locally (to file or shared mem) */
725 #if ENABLE_FEATURE_SYSLOGD_CFG
729 uint8_t facility = LOG_FAC(pri);
730 uint8_t prio_bit = 1 << LOG_PRI(pri);
732 for (rule = G.log_rules; rule; rule = rule->next) {
733 if (rule->enabled_facility_priomap[facility] & prio_bit) {
734 log_locally(now, G.printbuf, rule->file);
742 if (LOG_PRI(pri) < G.logLevel) {
743 #if ENABLE_FEATURE_IPC_SYSLOG
744 if ((option_mask32 & OPT_circularlog) && G.shbuf) {
745 log_to_shmem(G.printbuf);
749 log_locally(now, G.printbuf, &G.logFile);
753 static void timestamp_and_log_internal(const char *msg)
756 if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
758 timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
761 /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
762 * embedded NULs. Split messages on each of these NULs, parse prio,
763 * escape control chars and log each locally. */
764 static void split_escape_and_log(char *tmpbuf, int len)
771 char *q = G.parsebuf;
772 int pri = (LOG_USER | LOG_NOTICE);
775 /* Parse the magic priority number */
776 pri = bb_strtou(p + 1, &p, 10);
779 if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
780 pri = (LOG_USER | LOG_NOTICE);
786 if (!(c & ~0x1f) && c != '\t') {
788 c += '@'; /* ^@, ^A, ^B... */
795 timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
800 static void do_mark(int sig)
802 if (G.markInterval) {
803 timestamp_and_log_internal("-- MARK --");
804 alarm(G.markInterval);
809 /* Don't inline: prevent struct sockaddr_un to take up space on stack
811 static NOINLINE int create_socket(void)
813 struct sockaddr_un sunx;
817 #if ENABLE_FEATURE_SYSTEMD
818 if (sd_listen_fds() == 1)
819 return SD_LISTEN_FDS_START;
822 memset(&sunx, 0, sizeof(sunx));
823 sunx.sun_family = AF_UNIX;
825 /* Unlink old /dev/log or object it points to. */
826 /* (if it exists, bind will fail) */
827 strcpy(sunx.sun_path, "/dev/log");
828 dev_log_name = xmalloc_follow_symlinks("/dev/log");
830 safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
833 unlink(sunx.sun_path);
835 sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
836 xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
837 chmod("/dev/log", 0666);
842 #if ENABLE_FEATURE_REMOTE_LOG
843 static int try_to_resolve_remote(remoteHost_t *rh)
845 if (!rh->remoteAddr) {
846 unsigned now = monotonic_sec();
848 /* Don't resolve name too often - DNS timeouts can be big */
849 if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
851 rh->last_dns_resolve = now;
852 rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
856 return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
860 static void do_syslogd(void) NORETURN;
861 static void do_syslogd(void)
864 #if ENABLE_FEATURE_REMOTE_LOG
867 #if ENABLE_FEATURE_SYSLOGD_DUP
870 char *recvbuf = G.recvbuf;
872 #define recvbuf (G.recvbuf)
875 /* Set up signal handlers (so that they interrupt read()) */
876 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
877 signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
878 //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
879 signal(SIGHUP, SIG_IGN);
881 signal(SIGALRM, do_mark);
882 alarm(G.markInterval);
884 sock_fd = create_socket();
886 if (option_mask32 & OPT_circularlog)
889 if (option_mask32 & OPT_kmsg)
892 timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
894 while (!bb_got_signal) {
897 #if ENABLE_FEATURE_SYSLOGD_DUP
899 if (recvbuf == G.recvbuf)
900 recvbuf = G.recvbuf + MAX_READ;
905 sz = read(sock_fd, recvbuf, MAX_READ - 1);
908 bb_perror_msg("read from /dev/log");
912 /* Drop trailing '\n' and NULs (typically there is one NUL) */
916 /* man 3 syslog says: "A trailing newline is added when needed".
917 * However, neither glibc nor uclibc do this:
918 * syslog(prio, "test") sends "test\0" to /dev/log,
919 * syslog(prio, "test\n") sends "test\n\0".
920 * IOW: newline is passed verbatim!
921 * I take it to mean that it's syslogd's job
922 * to make those look identical in the log files. */
923 if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
927 #if ENABLE_FEATURE_SYSLOGD_DUP
928 if ((option_mask32 & OPT_dup) && (sz == last_sz))
929 if (memcmp(last_buf, recvbuf, sz) == 0)
933 #if ENABLE_FEATURE_REMOTE_LOG
934 /* Stock syslogd sends it '\n'-terminated
935 * over network, mimic that */
938 /* We are not modifying log messages in any way before send */
939 /* Remote site cannot trust _us_ anyway and need to do validation again */
940 for (item = G.remoteHosts; item != NULL; item = item->link) {
941 remoteHost_t *rh = (remoteHost_t *)item->data;
943 if (rh->remoteFD == -1) {
944 rh->remoteFD = try_to_resolve_remote(rh);
945 if (rh->remoteFD == -1)
949 /* Send message to remote logger.
950 * On some errors, close and set remoteFD to -1
951 * so that DNS resolution is retried.
953 if (sendto(rh->remoteFD, recvbuf, sz+1,
954 MSG_DONTWAIT | MSG_NOSIGNAL,
955 &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
959 case ENOTCONN: /* paranoia */
963 free(rh->remoteAddr);
964 rh->remoteAddr = NULL;
969 if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
970 recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
971 split_escape_and_log(recvbuf, sz);
973 } /* while (!bb_got_signal) */
975 timestamp_and_log_internal("syslogd exiting");
976 puts("syslogd exiting");
977 remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
979 if (option_mask32 & OPT_kmsg)
981 kill_myself_with_sig(bb_got_signal);
985 int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
986 int syslogd_main(int argc UNUSED_PARAM, char **argv)
990 #if ENABLE_FEATURE_REMOTE_LOG
991 llist_t *remoteAddrList = NULL;
996 /* No non-option params, -R can occur multiple times */
997 opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
998 opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
999 #if ENABLE_FEATURE_REMOTE_LOG
1000 while (remoteAddrList) {
1001 remoteHost_t *rh = xzalloc(sizeof(*rh));
1002 rh->remoteHostname = llist_pop(&remoteAddrList);
1004 rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
1005 llist_add_to(&G.remoteHosts, rh);
1010 if (opts & OPT_mark) // -m
1011 G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
1013 //if (opts & OPT_nofork) // -n
1014 //if (opts & OPT_outfile) // -O
1015 if (opts & OPT_loglevel) // -l
1016 G.logLevel = xatou_range(opt_l, 1, 8);
1017 //if (opts & OPT_small) // -S
1018 #if ENABLE_FEATURE_ROTATE_LOGFILE
1019 if (opts & OPT_filesize) // -s
1020 G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
1021 if (opts & OPT_rotatecnt) // -b
1022 G.logFileRotate = xatou_range(opt_b, 0, 99);
1024 #if ENABLE_FEATURE_IPC_SYSLOG
1026 G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
1028 /* If they have not specified remote logging, then log locally */
1029 if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
1030 option_mask32 |= OPT_locallog;
1031 #if ENABLE_FEATURE_SYSLOGD_CFG
1032 parse_syslogdcfg(opt_f);
1035 /* Store away localhost's name before the fork */
1036 G.hostname = safe_gethostname();
1037 *strchrnul(G.hostname, '.') = '\0';
1039 if (!(opts & OPT_nofork)) {
1040 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
1044 write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
1047 /* return EXIT_SUCCESS; */
1050 /* Clean up. Needed because we are included from syslogd_and_logger.c */
1053 #undef SYSLOGD_WRLOCK