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: IF_FEATURE_REMOTE_LOG(
25 //usage: "\n -R HOST[:PORT] Log to HOST:PORT (default PORT:514)"
26 //usage: "\n -L Log locally and via network (default is network only if -R)"
28 //usage: IF_FEATURE_IPC_SYSLOG(
29 /* NB: -Csize shouldn't have space (because size is optional) */
30 //usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
32 //usage: IF_FEATURE_KMSG_SYSLOG(
33 //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
35 //usage: "\n -O FILE Log to FILE (default:/var/log/messages, stdout if -)"
36 //usage: IF_FEATURE_ROTATE_LOGFILE(
37 //usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
38 //usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
40 //usage: "\n -l N Log only messages more urgent than prio N (1-8)"
41 //usage: "\n -S Smaller output"
42 //usage: IF_FEATURE_SYSLOGD_DUP(
43 //usage: "\n -D Drop duplicates"
45 //usage: IF_FEATURE_SYSLOGD_CFG(
46 //usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
48 /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
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
62 #define _PATH_LOG "/dev/log"
68 #if ENABLE_FEATURE_REMOTE_LOG
69 #include <netinet/in.h>
72 #if ENABLE_FEATURE_IPC_SYSLOG
81 /* MARK code is not very useful, is bloat, and broken:
82 * can deadlock if alarmed to make MARK while writing to IPC buffer
83 * (semaphores are down but do_mark routine tries to down them again) */
86 /* Write locking does not seem to be useful either */
90 MAX_READ
= CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE
,
91 DNS_WAIT_SEC
= 2 * 60,
94 /* Semaphore operation structures */
96 int32_t size
; /* size of data - 1 */
97 int32_t tail
; /* end of message list */
98 char data
[1]; /* data/messages */
101 #if ENABLE_FEATURE_REMOTE_LOG
104 unsigned last_dns_resolve
;
105 len_and_sockaddr
*remoteAddr
;
106 const char *remoteHostname
;
110 typedef struct logFile_t
{
113 time_t last_log_time
;
114 #if ENABLE_FEATURE_ROTATE_LOGFILE
120 #if ENABLE_FEATURE_SYSLOGD_CFG
121 typedef struct logRule_t
{
122 uint8_t enabled_facility_priomap
[LOG_NFACILITIES
];
123 struct logFile_t
*file
;
124 struct logRule_t
*next
;
128 /* Allows us to have smaller initializer. Ugly. */
131 /* interval between marks in seconds */ \
132 /*int markInterval;*/ \
133 /* level of messages to be logged */ \
135 IF_FEATURE_ROTATE_LOGFILE( \
136 /* max size of file before rotation */ \
137 unsigned logFileSize; \
138 /* number of rotated message files */ \
139 unsigned logFileRotate; \
141 IF_FEATURE_IPC_SYSLOG( \
142 int shmid; /* ipc shared memory id */ \
143 int s_semid; /* ipc semaphore id */ \
145 struct sembuf SMwup[1]; \
146 struct sembuf SMwdn[3]; \
148 IF_FEATURE_SYSLOGD_CFG( \
149 logRule_t *log_rules; \
151 IF_FEATURE_KMSG_SYSLOG( \
156 struct init_globals
{
163 #if ENABLE_FEATURE_REMOTE_LOG
164 llist_t
*remoteHosts
;
166 #if ENABLE_FEATURE_IPC_SYSLOG
167 struct shbuf_ds
*shbuf
;
169 /* localhost's name. We print only first 64 chars */
172 /* We recv into recvbuf... */
173 char recvbuf
[MAX_READ
* (1 + ENABLE_FEATURE_SYSLOGD_DUP
)];
174 /* ...then copy to parsebuf, escaping control chars */
175 /* (can grow x2 max) */
176 char parsebuf
[MAX_READ
*2];
177 /* ...then sprintf into printbuf, adding timestamp (15 chars),
178 * host (64), fac.prio (20) to the message */
179 /* (growth by: 15 + 64 + 20 + delims = ~110) */
180 char printbuf
[MAX_READ
*2 + 128];
183 static const struct init_globals init_data
= {
185 .path
= "/var/log/messages",
189 .markInterval
= 20 * 60,
192 #if ENABLE_FEATURE_ROTATE_LOGFILE
193 .logFileSize
= 200 * 1024,
196 #if ENABLE_FEATURE_IPC_SYSLOG
199 .shm_size
= ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
)*1024), /* default shm size */
200 .SMwup
= { {1, -1, IPC_NOWAIT
} },
201 .SMwdn
= { {0, 0}, {1, 0}, {1, +1} },
205 #define G (*ptr_to_globals)
206 #define INIT_G() do { \
207 SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
213 OPTBIT_mark
= 0, // -m
215 OPTBIT_outfile
, // -O
216 OPTBIT_loglevel
, // -l
218 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize
,) // -s
219 IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt
,) // -b
220 IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog
,) // -R
221 IF_FEATURE_REMOTE_LOG( OPTBIT_locallog
,) // -L
222 IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog
,) // -C
223 IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup
,) // -D
224 IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg
,) // -f
225 IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg
,) // -K
227 OPT_mark
= 1 << OPTBIT_mark
,
228 OPT_nofork
= 1 << OPTBIT_nofork
,
229 OPT_outfile
= 1 << OPTBIT_outfile
,
230 OPT_loglevel
= 1 << OPTBIT_loglevel
,
231 OPT_small
= 1 << OPTBIT_small
,
232 OPT_filesize
= IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize
)) + 0,
233 OPT_rotatecnt
= IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt
)) + 0,
234 OPT_remotelog
= IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog
)) + 0,
235 OPT_locallog
= IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog
)) + 0,
236 OPT_circularlog
= IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog
)) + 0,
237 OPT_dup
= IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup
)) + 0,
238 OPT_cfg
= IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg
)) + 0,
239 OPT_kmsg
= IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg
)) + 0,
242 #define OPTION_STR "m:nO:l:S" \
243 IF_FEATURE_ROTATE_LOGFILE("s:" ) \
244 IF_FEATURE_ROTATE_LOGFILE("b:" ) \
245 IF_FEATURE_REMOTE_LOG( "R:" ) \
246 IF_FEATURE_REMOTE_LOG( "L" ) \
247 IF_FEATURE_IPC_SYSLOG( "C::") \
248 IF_FEATURE_SYSLOGD_DUP( "D" ) \
249 IF_FEATURE_SYSLOGD_CFG( "f:" ) \
250 IF_FEATURE_KMSG_SYSLOG( "K" )
251 #define OPTION_DECL *opt_m, *opt_l \
252 IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
253 IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
254 IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
255 IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
256 #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
257 IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
258 IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
259 IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
260 IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
261 IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
264 #if ENABLE_FEATURE_SYSLOGD_CFG
265 static const CODE
* find_by_name(char *name
, const CODE
* c_set
)
267 for (; c_set
->c_name
; c_set
++) {
268 if (strcmp(name
, c_set
->c_name
) == 0)
274 static const CODE
* find_by_val(int val
, const CODE
* c_set
)
276 for (; c_set
->c_name
; c_set
++) {
277 if (c_set
->c_val
== val
)
283 #if ENABLE_FEATURE_SYSLOGD_CFG
284 static void parse_syslogdcfg(const char *file
)
288 /* tok[0] set of selectors */
289 /* tok[1] file name */
290 /* tok[2] has to be NULL */
294 parser
= config_open2(file
? file
: "/etc/syslog.conf",
295 file
? xfopen_for_read
: fopen_for_read
);
297 /* didn't find default /etc/syslog.conf */
298 /* proceed as if we built busybox without config support */
301 /* use ptr to ptr to avoid checking whether head was initialized */
302 pp_rule
= &G
.log_rules
;
303 /* iterate through lines of config, skipping comments */
304 while (config_read(parser
, tok
, 3, 2, "# \t", PARSE_NORMAL
| PARSE_MIN_DIE
)) {
308 /* unexpected trailing token? */
312 cur_rule
= *pp_rule
= xzalloc(sizeof(*cur_rule
));
314 cur_selector
= tok
[0];
315 /* iterate through selectors: "kern.info;kern.!err;..." */
319 uint8_t negated_prio
; /* "kern.!err" */
320 uint8_t single_prio
; /* "kern.=err" */
321 uint32_t facmap
; /* bitmap of enabled facilities */
322 uint8_t primap
; /* bitmap of enabled priorities */
325 next_selector
= strchr(cur_selector
, ';');
327 *next_selector
++ = '\0';
329 t
= strchr(cur_selector
, '.');
332 *t
++ = '\0'; /* separate facility from priority */
347 primap
= 0xff; /* all 8 log levels enabled */
350 code
= find_by_name(t
, prioritynames
);
354 priority
= code
->c_val
;
355 if (priority
== INTERNAL_NOPRI
) {
356 /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
359 priority
= 1 << priority
;
372 if (*cur_selector
== '*')
373 facmap
= (1<<LOG_NFACILITIES
) - 1;
378 /* iterate through facilities: "kern,daemon.<priospec>" */
380 next_facility
= strchr(t
, ',');
382 *next_facility
++ = '\0';
383 code
= find_by_name(t
, facilitynames
);
386 /* "mark" is not a real facility, skip it */
387 if (code
->c_val
!= INTERNAL_MARK
)
388 facmap
|= 1<<(LOG_FAC(code
->c_val
));
393 /* merge result with previous selectors */
394 for (i
= 0; i
< LOG_NFACILITIES
; ++i
) {
395 if (!(facmap
& (1<<i
)))
398 cur_rule
->enabled_facility_priomap
[i
] &= primap
;
400 cur_rule
->enabled_facility_priomap
[i
] |= primap
;
403 cur_selector
= next_selector
;
404 } while (cur_selector
);
406 /* check whether current file name was mentioned in previous rules or
407 * as global logfile (G.logFile).
409 if (strcmp(G
.logFile
.path
, tok
[1]) == 0) {
410 cur_rule
->file
= &G
.logFile
;
413 /* temporarily use cur_rule as iterator, but *pp_rule still points
414 * to currently processing rule entry.
415 * NOTE: *pp_rule points to the current (and last in the list) rule.
417 for (cur_rule
= G
.log_rules
; cur_rule
!= *pp_rule
; cur_rule
= cur_rule
->next
) {
418 if (strcmp(cur_rule
->file
->path
, tok
[1]) == 0) {
419 /* found - reuse the same file structure */
420 (*pp_rule
)->file
= cur_rule
->file
;
425 cur_rule
->file
= xzalloc(sizeof(*cur_rule
->file
));
426 cur_rule
->file
->fd
= -1;
427 cur_rule
->file
->path
= xstrdup(tok
[1]);
429 pp_rule
= &cur_rule
->next
;
431 config_close(parser
);
435 bb_error_msg_and_die("error in '%s' at line %d",
436 file
? file
: "/etc/syslog.conf",
441 /* circular buffer variables/structures */
442 #if ENABLE_FEATURE_IPC_SYSLOG
444 #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
445 #error Sorry, you must set the syslogd buffer size to at least 4KB.
446 #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
449 /* our shared key (syslogd.c and logread.c must be in sync) */
450 enum { KEY_ID
= 0x414e4547 }; /* "GENA" */
452 static void ipcsyslog_cleanup(void)
458 shmctl(G
.shmid
, IPC_RMID
, NULL
);
460 if (G
.s_semid
!= -1) {
461 semctl(G
.s_semid
, 0, IPC_RMID
, 0);
465 static void ipcsyslog_init(void)
468 printf("shmget(%x, %d,...)\n", (int)KEY_ID
, G
.shm_size
);
470 G
.shmid
= shmget(KEY_ID
, G
.shm_size
, IPC_CREAT
| 0644);
472 bb_perror_msg_and_die("shmget");
475 G
.shbuf
= shmat(G
.shmid
, NULL
, 0);
476 if (G
.shbuf
== (void*) -1L) { /* shmat has bizarre error return */
477 bb_perror_msg_and_die("shmat");
480 memset(G
.shbuf
, 0, G
.shm_size
);
481 G
.shbuf
->size
= G
.shm_size
- offsetof(struct shbuf_ds
, data
) - 1;
482 /*G.shbuf->tail = 0;*/
484 /* we'll trust the OS to set initial semval to 0 (let's hope) */
485 G
.s_semid
= semget(KEY_ID
, 2, IPC_CREAT
| IPC_EXCL
| 1023);
486 if (G
.s_semid
== -1) {
487 if (errno
== EEXIST
) {
488 G
.s_semid
= semget(KEY_ID
, 2, 0);
492 bb_perror_msg_and_die("semget");
496 /* Write message to shared mem buffer */
497 static void log_to_shmem(const char *msg
)
499 int old_tail
, new_tail
;
502 if (semop(G
.s_semid
, G
.SMwdn
, 3) == -1) {
503 bb_perror_msg_and_die("SMwdn");
506 /* Circular Buffer Algorithm:
507 * --------------------------
508 * tail == position where to store next syslog message.
509 * tail's max value is (shbuf->size - 1)
510 * Last byte of buffer is never used and remains NUL.
512 len
= strlen(msg
) + 1; /* length with NUL included */
514 old_tail
= G
.shbuf
->tail
;
515 new_tail
= old_tail
+ len
;
516 if (new_tail
< G
.shbuf
->size
) {
517 /* store message, set new tail */
518 memcpy(G
.shbuf
->data
+ old_tail
, msg
, len
);
519 G
.shbuf
->tail
= new_tail
;
521 /* k == available buffer space ahead of old tail */
522 int k
= G
.shbuf
->size
- old_tail
;
523 /* copy what fits to the end of buffer, and repeat */
524 memcpy(G
.shbuf
->data
+ old_tail
, msg
, k
);
530 if (semop(G
.s_semid
, G
.SMwup
, 1) == -1) {
531 bb_perror_msg_and_die("SMwup");
534 printf("tail:%d\n", G
.shbuf
->tail
);
537 static void ipcsyslog_cleanup(void) {}
538 static void ipcsyslog_init(void) {}
539 void log_to_shmem(const char *msg
);
540 #endif /* FEATURE_IPC_SYSLOG */
542 #if ENABLE_FEATURE_KMSG_SYSLOG
543 static void kmsg_init(void)
545 G
.kmsgfd
= xopen("/dev/kmsg", O_WRONLY
);
548 * kernel < 3.5 expects single char printk KERN_* priority prefix,
549 * from 3.5 onwards the full syslog facility/priority format is supported
551 if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
552 G
.primask
= LOG_PRIMASK
;
557 static void kmsg_cleanup(void)
559 if (ENABLE_FEATURE_CLEAN_UP
)
563 /* Write message to /dev/kmsg */
564 static void log_to_kmsg(int pri
, const char *msg
)
567 * kernel < 3.5 expects single char printk KERN_* priority prefix,
568 * from 3.5 onwards the full syslog facility/priority format is supported
572 full_write(G
.kmsgfd
, G
.printbuf
, sprintf(G
.printbuf
, "<%d>%s\n", pri
, msg
));
575 static void kmsg_init(void) {}
576 static void kmsg_cleanup(void) {}
577 static void log_to_kmsg(int pri UNUSED_PARAM
, const char *msg UNUSED_PARAM
) {}
578 #endif /* FEATURE_KMSG_SYSLOG */
580 /* Print a message to the log file. */
581 static void log_locally(time_t now
, char *msg
, logFile_t
*log_file
)
583 #ifdef SYSLOGD_WRLOCK
586 int len
= strlen(msg
);
588 /* fd can't be 0 (we connect fd 0 to /dev/log socket) */
589 /* fd is 1 if "-O -" is in use */
590 if (log_file
->fd
> 1) {
591 /* Reopen log files every second. This allows admin
592 * to delete the files and not worry about restarting us.
593 * This costs almost nothing since it happens
594 * _at most_ once a second for each file, and happens
595 * only when each file is actually written.
599 if (log_file
->last_log_time
!= now
) {
600 log_file
->last_log_time
= now
;
605 else if (log_file
->fd
== 1) {
606 /* We are logging to stdout: do nothing */
609 if (LONE_DASH(log_file
->path
)) {
611 /* log_file->isRegular = 0; - already is */
614 log_file
->fd
= open(log_file
->path
, O_WRONLY
| O_CREAT
615 | O_NOCTTY
| O_APPEND
| O_NONBLOCK
,
617 if (log_file
->fd
< 0) {
618 /* cannot open logfile? - print to /dev/console then */
619 int fd
= device_open(DEV_CONSOLE
, O_WRONLY
| O_NOCTTY
| O_NONBLOCK
);
621 fd
= 2; /* then stderr, dammit */
622 full_write(fd
, msg
, len
);
627 #if ENABLE_FEATURE_ROTATE_LOGFILE
630 log_file
->isRegular
= (fstat(log_file
->fd
, &statf
) == 0 && S_ISREG(statf
.st_mode
));
631 /* bug (mostly harmless): can wrap around if file > 4gb */
632 log_file
->size
= statf
.st_size
;
638 #ifdef SYSLOGD_WRLOCK
639 fl
.l_whence
= SEEK_SET
;
643 fcntl(log_file
->fd
, F_SETLKW
, &fl
);
646 #if ENABLE_FEATURE_ROTATE_LOGFILE
647 if (G
.logFileSize
&& log_file
->isRegular
&& log_file
->size
> G
.logFileSize
) {
648 if (G
.logFileRotate
) { /* always 0..99 */
649 int i
= strlen(log_file
->path
) + 3 + 1;
652 i
= G
.logFileRotate
- 1;
653 /* rename: f.8 -> f.9; f.7 -> f.8; ... */
655 sprintf(newFile
, "%s.%d", log_file
->path
, i
);
657 sprintf(oldFile
, "%s.%d", log_file
->path
, --i
);
658 /* ignore errors - file might be missing */
659 rename(oldFile
, newFile
);
661 /* newFile == "f.0" now */
662 rename(log_file
->path
, newFile
);
665 /* We may or may not have just renamed the file away;
666 * if we didn't rename because we aren't keeping any backlog,
667 * then it's time to clobber the file. If we did rename it...,
668 * incredibly, if F and F.0 are hardlinks, POSIX _demands_
669 * that rename returns 0 but does not remove F!!!
670 * (hardlinked F/F.0 pair was observed after
671 * power failure during rename()).
672 * So ensure old file is gone in any case:
674 unlink(log_file
->path
);
675 #ifdef SYSLOGD_WRLOCK
677 fcntl(log_file
->fd
, F_SETLKW
, &fl
);
682 /* TODO: what to do on write errors ("disk full")? */
683 len
= full_write(log_file
->fd
, msg
, len
);
685 log_file
->size
+= len
;
687 full_write(log_file
->fd
, msg
, len
);
690 #ifdef SYSLOGD_WRLOCK
692 fcntl(log_file
->fd
, F_SETLKW
, &fl
);
696 static void parse_fac_prio_20(int pri
, char *res20
)
698 const CODE
*c_pri
, *c_fac
;
700 c_fac
= find_by_val(LOG_FAC(pri
) << 3, facilitynames
);
702 c_pri
= find_by_val(LOG_PRI(pri
), prioritynames
);
704 snprintf(res20
, 20, "%s.%s", c_fac
->c_name
, c_pri
->c_name
);
708 snprintf(res20
, 20, "<%d>", pri
);
711 /* len parameter is used only for "is there a timestamp?" check.
712 * NB: some callers cheat and supply len==0 when they know
713 * that there is no timestamp, short-circuiting the test. */
714 static void timestamp_and_log(int pri
, char *msg
, int len
)
719 /* Jan 18 00:11:22 msg... */
720 /* 01234567890123456 */
721 if (len
< 16 || msg
[3] != ' ' || msg
[6] != ' '
722 || msg
[9] != ':' || msg
[12] != ':' || msg
[15] != ' '
725 timestamp
= ctime(&now
) + 4; /* skip day of week */
731 timestamp
[15] = '\0';
733 if (option_mask32
& OPT_kmsg
) {
734 log_to_kmsg(pri
, msg
);
738 if (option_mask32
& OPT_small
)
739 sprintf(G
.printbuf
, "%s %s\n", timestamp
, msg
);
742 parse_fac_prio_20(pri
, res
);
743 sprintf(G
.printbuf
, "%s %.64s %s %s\n", timestamp
, G
.hostname
, res
, msg
);
746 /* Log message locally (to file or shared mem) */
747 #if ENABLE_FEATURE_SYSLOGD_CFG
751 uint8_t facility
= LOG_FAC(pri
);
752 uint8_t prio_bit
= 1 << LOG_PRI(pri
);
754 for (rule
= G
.log_rules
; rule
; rule
= rule
->next
) {
755 if (rule
->enabled_facility_priomap
[facility
] & prio_bit
) {
756 log_locally(now
, G
.printbuf
, rule
->file
);
764 if (LOG_PRI(pri
) < G
.logLevel
) {
765 #if ENABLE_FEATURE_IPC_SYSLOG
766 if ((option_mask32
& OPT_circularlog
) && G
.shbuf
) {
767 log_to_shmem(G
.printbuf
);
771 log_locally(now
, G
.printbuf
, &G
.logFile
);
775 static void timestamp_and_log_internal(const char *msg
)
778 if (ENABLE_FEATURE_REMOTE_LOG
&& !(option_mask32
& OPT_locallog
))
780 timestamp_and_log(LOG_SYSLOG
| LOG_INFO
, (char*)msg
, 0);
783 /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
784 * embedded NULs. Split messages on each of these NULs, parse prio,
785 * escape control chars and log each locally. */
786 static void split_escape_and_log(char *tmpbuf
, int len
)
793 char *q
= G
.parsebuf
;
794 int pri
= (LOG_USER
| LOG_NOTICE
);
797 /* Parse the magic priority number */
798 pri
= bb_strtou(p
+ 1, &p
, 10);
801 if (pri
& ~(LOG_FACMASK
| LOG_PRIMASK
))
802 pri
= (LOG_USER
| LOG_NOTICE
);
808 if (!(c
& ~0x1f) && c
!= '\t') {
810 c
+= '@'; /* ^@, ^A, ^B... */
817 timestamp_and_log(pri
, G
.parsebuf
, q
- G
.parsebuf
);
822 static void do_mark(int sig
)
824 if (G
.markInterval
) {
825 timestamp_and_log_internal("-- MARK --");
826 alarm(G
.markInterval
);
831 /* Don't inline: prevent struct sockaddr_un to take up space on stack
833 static NOINLINE
int create_socket(void)
835 struct sockaddr_un sunx
;
839 #if ENABLE_FEATURE_SYSTEMD
840 if (sd_listen_fds() == 1)
841 return SD_LISTEN_FDS_START
;
844 memset(&sunx
, 0, sizeof(sunx
));
845 sunx
.sun_family
= AF_UNIX
;
847 /* Unlink old /dev/log or object it points to. */
848 /* (if it exists, bind will fail) */
849 strcpy(sunx
.sun_path
, _PATH_LOG
);
850 dev_log_name
= xmalloc_follow_symlinks(_PATH_LOG
);
852 safe_strncpy(sunx
.sun_path
, dev_log_name
, sizeof(sunx
.sun_path
));
855 unlink(sunx
.sun_path
);
857 sock_fd
= xsocket(AF_UNIX
, SOCK_DGRAM
, 0);
858 xbind(sock_fd
, (struct sockaddr
*) &sunx
, sizeof(sunx
));
859 chmod(_PATH_LOG
, 0666);
864 #if ENABLE_FEATURE_REMOTE_LOG
865 static int try_to_resolve_remote(remoteHost_t
*rh
)
867 if (!rh
->remoteAddr
) {
868 unsigned now
= monotonic_sec();
870 /* Don't resolve name too often - DNS timeouts can be big */
871 if ((now
- rh
->last_dns_resolve
) < DNS_WAIT_SEC
)
873 rh
->last_dns_resolve
= now
;
874 rh
->remoteAddr
= host2sockaddr(rh
->remoteHostname
, 514);
878 return xsocket(rh
->remoteAddr
->u
.sa
.sa_family
, SOCK_DGRAM
, 0);
882 static void do_syslogd(void) NORETURN
;
883 static void do_syslogd(void)
885 #if ENABLE_FEATURE_REMOTE_LOG
888 #if ENABLE_FEATURE_SYSLOGD_DUP
891 char *recvbuf
= G
.recvbuf
;
893 #define recvbuf (G.recvbuf)
896 /* Set up signal handlers (so that they interrupt read()) */
897 signal_no_SA_RESTART_empty_mask(SIGTERM
, record_signo
);
898 signal_no_SA_RESTART_empty_mask(SIGINT
, record_signo
);
899 //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
900 signal(SIGHUP
, SIG_IGN
);
902 signal(SIGALRM
, do_mark
);
903 alarm(G
.markInterval
);
905 xmove_fd(create_socket(), STDIN_FILENO
);
907 if (option_mask32
& OPT_circularlog
)
910 if (option_mask32
& OPT_kmsg
)
913 timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER
);
915 while (!bb_got_signal
) {
918 #if ENABLE_FEATURE_SYSLOGD_DUP
920 if (recvbuf
== G
.recvbuf
)
921 recvbuf
= G
.recvbuf
+ MAX_READ
;
926 sz
= read(STDIN_FILENO
, recvbuf
, MAX_READ
- 1);
929 bb_perror_msg("read from %s", _PATH_LOG
);
933 /* Drop trailing '\n' and NULs (typically there is one NUL) */
937 /* man 3 syslog says: "A trailing newline is added when needed".
938 * However, neither glibc nor uclibc do this:
939 * syslog(prio, "test") sends "test\0" to /dev/log,
940 * syslog(prio, "test\n") sends "test\n\0".
941 * IOW: newline is passed verbatim!
942 * I take it to mean that it's syslogd's job
943 * to make those look identical in the log files. */
944 if (recvbuf
[sz
-1] != '\0' && recvbuf
[sz
-1] != '\n')
948 #if ENABLE_FEATURE_SYSLOGD_DUP
949 if ((option_mask32
& OPT_dup
) && (sz
== last_sz
))
950 if (memcmp(last_buf
, recvbuf
, sz
) == 0)
954 #if ENABLE_FEATURE_REMOTE_LOG
955 /* Stock syslogd sends it '\n'-terminated
956 * over network, mimic that */
959 /* We are not modifying log messages in any way before send */
960 /* Remote site cannot trust _us_ anyway and need to do validation again */
961 for (item
= G
.remoteHosts
; item
!= NULL
; item
= item
->link
) {
962 remoteHost_t
*rh
= (remoteHost_t
*)item
->data
;
964 if (rh
->remoteFD
== -1) {
965 rh
->remoteFD
= try_to_resolve_remote(rh
);
966 if (rh
->remoteFD
== -1)
970 /* Send message to remote logger.
971 * On some errors, close and set remoteFD to -1
972 * so that DNS resolution is retried.
974 if (sendto(rh
->remoteFD
, recvbuf
, sz
+1,
975 MSG_DONTWAIT
| MSG_NOSIGNAL
,
976 &(rh
->remoteAddr
->u
.sa
), rh
->remoteAddr
->len
) == -1
980 case ENOTCONN
: /* paranoia */
984 free(rh
->remoteAddr
);
985 rh
->remoteAddr
= NULL
;
990 if (!ENABLE_FEATURE_REMOTE_LOG
|| (option_mask32
& OPT_locallog
)) {
991 recvbuf
[sz
] = '\0'; /* ensure it *is* NUL terminated */
992 split_escape_and_log(recvbuf
, sz
);
994 } /* while (!bb_got_signal) */
996 timestamp_and_log_internal("syslogd exiting");
997 remove_pidfile(CONFIG_PID_FILE_PATH
"/syslogd.pid");
999 if (option_mask32
& OPT_kmsg
)
1001 kill_myself_with_sig(bb_got_signal
);
1005 int syslogd_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
1006 int syslogd_main(int argc UNUSED_PARAM
, char **argv
)
1010 #if ENABLE_FEATURE_REMOTE_LOG
1011 llist_t
*remoteAddrList
= NULL
;
1016 /* No non-option params, -R can occur multiple times */
1017 opt_complementary
= "=0" IF_FEATURE_REMOTE_LOG(":R::");
1018 opts
= getopt32(argv
, OPTION_STR
, OPTION_PARAM
);
1019 #if ENABLE_FEATURE_REMOTE_LOG
1020 while (remoteAddrList
) {
1021 remoteHost_t
*rh
= xzalloc(sizeof(*rh
));
1022 rh
->remoteHostname
= llist_pop(&remoteAddrList
);
1024 rh
->last_dns_resolve
= monotonic_sec() - DNS_WAIT_SEC
- 1;
1025 llist_add_to(&G
.remoteHosts
, rh
);
1030 if (opts
& OPT_mark
) // -m
1031 G
.markInterval
= xatou_range(opt_m
, 0, INT_MAX
/60) * 60;
1033 //if (opts & OPT_nofork) // -n
1034 //if (opts & OPT_outfile) // -O
1035 if (opts
& OPT_loglevel
) // -l
1036 G
.logLevel
= xatou_range(opt_l
, 1, 8);
1037 //if (opts & OPT_small) // -S
1038 #if ENABLE_FEATURE_ROTATE_LOGFILE
1039 if (opts
& OPT_filesize
) // -s
1040 G
.logFileSize
= xatou_range(opt_s
, 0, INT_MAX
/1024) * 1024;
1041 if (opts
& OPT_rotatecnt
) // -b
1042 G
.logFileRotate
= xatou_range(opt_b
, 0, 99);
1044 #if ENABLE_FEATURE_IPC_SYSLOG
1046 G
.shm_size
= xatoul_range(opt_C
, 4, INT_MAX
/1024) * 1024;
1048 /* If they have not specified remote logging, then log locally */
1049 if (ENABLE_FEATURE_REMOTE_LOG
&& !(opts
& OPT_remotelog
)) // -R
1050 option_mask32
|= OPT_locallog
;
1051 #if ENABLE_FEATURE_SYSLOGD_CFG
1052 parse_syslogdcfg(opt_f
);
1055 /* Store away localhost's name before the fork */
1056 G
.hostname
= safe_gethostname();
1057 *strchrnul(G
.hostname
, '.') = '\0';
1059 if (!(opts
& OPT_nofork
)) {
1060 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT
, argv
);
1064 write_pidfile(CONFIG_PID_FILE_PATH
"/syslogd.pid");
1067 /* return EXIT_SUCCESS; */
1070 /* Clean up. Needed because we are included from syslogd_and_logger.c */
1073 #undef SYSLOGD_WRLOCK