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)" */
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