Contents of /trunk/mkinitrd-magellan/busybox/sysklogd/syslogd.c
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 18520 byte(s)
-updated to busybox-1.13.4
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini syslogd implementation for busybox |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org> |
8 | * |
9 | * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com> |
10 | * |
11 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001 |
12 | * |
13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
14 | */ |
15 | |
16 | /* |
17 | * Done in syslogd_and_logger.c: |
18 | #include "libbb.h" |
19 | #define SYSLOG_NAMES |
20 | #define SYSLOG_NAMES_CONST |
21 | #include <syslog.h> |
22 | */ |
23 | |
24 | #include <paths.h> |
25 | #include <sys/un.h> |
26 | #include <sys/uio.h> |
27 | |
28 | #if ENABLE_FEATURE_REMOTE_LOG |
29 | #include <netinet/in.h> |
30 | #endif |
31 | |
32 | #if ENABLE_FEATURE_IPC_SYSLOG |
33 | #include <sys/ipc.h> |
34 | #include <sys/sem.h> |
35 | #include <sys/shm.h> |
36 | #endif |
37 | |
38 | |
39 | #define DEBUG 0 |
40 | |
41 | /* MARK code is not very useful, is bloat, and broken: |
42 | * can deadlock if alarmed to make MARK while writing to IPC buffer |
43 | * (semaphores are down but do_mark routine tries to down them again) */ |
44 | #undef SYSLOGD_MARK |
45 | |
46 | enum { |
47 | MAX_READ = 256, |
48 | DNS_WAIT_SEC = 2 * 60, |
49 | }; |
50 | |
51 | /* Semaphore operation structures */ |
52 | struct shbuf_ds { |
53 | int32_t size; /* size of data - 1 */ |
54 | int32_t tail; /* end of message list */ |
55 | char data[1]; /* data/messages */ |
56 | }; |
57 | |
58 | /* Allows us to have smaller initializer. Ugly. */ |
59 | #define GLOBALS \ |
60 | const char *logFilePath; \ |
61 | int logFD; \ |
62 | /* interval between marks in seconds */ \ |
63 | /*int markInterval;*/ \ |
64 | /* level of messages to be logged */ \ |
65 | int logLevel; \ |
66 | USE_FEATURE_ROTATE_LOGFILE( \ |
67 | /* max size of file before rotation */ \ |
68 | unsigned logFileSize; \ |
69 | /* number of rotated message files */ \ |
70 | unsigned logFileRotate; \ |
71 | unsigned curFileSize; \ |
72 | smallint isRegular; \ |
73 | ) \ |
74 | USE_FEATURE_REMOTE_LOG( \ |
75 | /* udp socket for remote logging */ \ |
76 | int remoteFD; \ |
77 | len_and_sockaddr* remoteAddr; \ |
78 | ) \ |
79 | USE_FEATURE_IPC_SYSLOG( \ |
80 | int shmid; /* ipc shared memory id */ \ |
81 | int s_semid; /* ipc semaphore id */ \ |
82 | int shm_size; \ |
83 | struct sembuf SMwup[1]; \ |
84 | struct sembuf SMwdn[3]; \ |
85 | ) |
86 | |
87 | struct init_globals { |
88 | GLOBALS |
89 | }; |
90 | |
91 | struct globals { |
92 | GLOBALS |
93 | |
94 | #if ENABLE_FEATURE_REMOTE_LOG |
95 | unsigned last_dns_resolve; |
96 | char *remoteAddrStr; |
97 | #endif |
98 | |
99 | #if ENABLE_FEATURE_IPC_SYSLOG |
100 | struct shbuf_ds *shbuf; |
101 | #endif |
102 | time_t last_log_time; |
103 | /* localhost's name. We print only first 64 chars */ |
104 | char *hostname; |
105 | |
106 | /* We recv into recvbuf... */ |
107 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)]; |
108 | /* ...then copy to parsebuf, escaping control chars */ |
109 | /* (can grow x2 max) */ |
110 | char parsebuf[MAX_READ*2]; |
111 | /* ...then sprintf into printbuf, adding timestamp (15 chars), |
112 | * host (64), fac.prio (20) to the message */ |
113 | /* (growth by: 15 + 64 + 20 + delims = ~110) */ |
114 | char printbuf[MAX_READ*2 + 128]; |
115 | }; |
116 | |
117 | static const struct init_globals init_data = { |
118 | .logFilePath = "/var/log/messages", |
119 | .logFD = -1, |
120 | #ifdef SYSLOGD_MARK |
121 | .markInterval = 20 * 60, |
122 | #endif |
123 | .logLevel = 8, |
124 | #if ENABLE_FEATURE_ROTATE_LOGFILE |
125 | .logFileSize = 200 * 1024, |
126 | .logFileRotate = 1, |
127 | #endif |
128 | #if ENABLE_FEATURE_REMOTE_LOG |
129 | .remoteFD = -1, |
130 | #endif |
131 | #if ENABLE_FEATURE_IPC_SYSLOG |
132 | .shmid = -1, |
133 | .s_semid = -1, |
134 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size |
135 | .SMwup = { {1, -1, IPC_NOWAIT} }, |
136 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} }, |
137 | #endif |
138 | }; |
139 | |
140 | #define G (*ptr_to_globals) |
141 | #define INIT_G() do { \ |
142 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \ |
143 | } while (0) |
144 | |
145 | |
146 | /* Options */ |
147 | enum { |
148 | OPTBIT_mark = 0, // -m |
149 | OPTBIT_nofork, // -n |
150 | OPTBIT_outfile, // -O |
151 | OPTBIT_loglevel, // -l |
152 | OPTBIT_small, // -S |
153 | USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s |
154 | USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b |
155 | USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R |
156 | USE_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L |
157 | USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C |
158 | USE_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D |
159 | |
160 | OPT_mark = 1 << OPTBIT_mark , |
161 | OPT_nofork = 1 << OPTBIT_nofork , |
162 | OPT_outfile = 1 << OPTBIT_outfile , |
163 | OPT_loglevel = 1 << OPTBIT_loglevel, |
164 | OPT_small = 1 << OPTBIT_small , |
165 | OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0, |
166 | OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0, |
167 | OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0, |
168 | OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0, |
169 | OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0, |
170 | OPT_dup = USE_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0, |
171 | }; |
172 | #define OPTION_STR "m:nO:l:S" \ |
173 | USE_FEATURE_ROTATE_LOGFILE("s:" ) \ |
174 | USE_FEATURE_ROTATE_LOGFILE("b:" ) \ |
175 | USE_FEATURE_REMOTE_LOG( "R:" ) \ |
176 | USE_FEATURE_REMOTE_LOG( "L" ) \ |
177 | USE_FEATURE_IPC_SYSLOG( "C::") \ |
178 | USE_FEATURE_SYSLOGD_DUP( "D" ) |
179 | #define OPTION_DECL *opt_m, *opt_l \ |
180 | USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \ |
181 | USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \ |
182 | USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) |
183 | #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \ |
184 | USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \ |
185 | USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \ |
186 | USE_FEATURE_REMOTE_LOG( ,&G.remoteAddrStr) \ |
187 | USE_FEATURE_IPC_SYSLOG( ,&opt_C) |
188 | |
189 | |
190 | /* circular buffer variables/structures */ |
191 | #if ENABLE_FEATURE_IPC_SYSLOG |
192 | |
193 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4 |
194 | #error Sorry, you must set the syslogd buffer size to at least 4KB. |
195 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE |
196 | #endif |
197 | |
198 | /* our shared key (syslogd.c and logread.c must be in sync) */ |
199 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */ |
200 | |
201 | static void ipcsyslog_cleanup(void) |
202 | { |
203 | if (G.shmid != -1) { |
204 | shmdt(G.shbuf); |
205 | } |
206 | if (G.shmid != -1) { |
207 | shmctl(G.shmid, IPC_RMID, NULL); |
208 | } |
209 | if (G.s_semid != -1) { |
210 | semctl(G.s_semid, 0, IPC_RMID, 0); |
211 | } |
212 | } |
213 | |
214 | static void ipcsyslog_init(void) |
215 | { |
216 | if (DEBUG) |
217 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size); |
218 | |
219 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644); |
220 | if (G.shmid == -1) { |
221 | bb_perror_msg_and_die("shmget"); |
222 | } |
223 | |
224 | G.shbuf = shmat(G.shmid, NULL, 0); |
225 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */ |
226 | bb_perror_msg_and_die("shmat"); |
227 | } |
228 | |
229 | memset(G.shbuf, 0, G.shm_size); |
230 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1; |
231 | /*G.shbuf->tail = 0;*/ |
232 | |
233 | // we'll trust the OS to set initial semval to 0 (let's hope) |
234 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023); |
235 | if (G.s_semid == -1) { |
236 | if (errno == EEXIST) { |
237 | G.s_semid = semget(KEY_ID, 2, 0); |
238 | if (G.s_semid != -1) |
239 | return; |
240 | } |
241 | bb_perror_msg_and_die("semget"); |
242 | } |
243 | } |
244 | |
245 | /* Write message to shared mem buffer */ |
246 | static void log_to_shmem(const char *msg, int len) |
247 | { |
248 | int old_tail, new_tail; |
249 | |
250 | if (semop(G.s_semid, G.SMwdn, 3) == -1) { |
251 | bb_perror_msg_and_die("SMwdn"); |
252 | } |
253 | |
254 | /* Circular Buffer Algorithm: |
255 | * -------------------------- |
256 | * tail == position where to store next syslog message. |
257 | * tail's max value is (shbuf->size - 1) |
258 | * Last byte of buffer is never used and remains NUL. |
259 | */ |
260 | len++; /* length with NUL included */ |
261 | again: |
262 | old_tail = G.shbuf->tail; |
263 | new_tail = old_tail + len; |
264 | if (new_tail < G.shbuf->size) { |
265 | /* store message, set new tail */ |
266 | memcpy(G.shbuf->data + old_tail, msg, len); |
267 | G.shbuf->tail = new_tail; |
268 | } else { |
269 | /* k == available buffer space ahead of old tail */ |
270 | int k = G.shbuf->size - old_tail; |
271 | /* copy what fits to the end of buffer, and repeat */ |
272 | memcpy(G.shbuf->data + old_tail, msg, k); |
273 | msg += k; |
274 | len -= k; |
275 | G.shbuf->tail = 0; |
276 | goto again; |
277 | } |
278 | if (semop(G.s_semid, G.SMwup, 1) == -1) { |
279 | bb_perror_msg_and_die("SMwup"); |
280 | } |
281 | if (DEBUG) |
282 | printf("tail:%d\n", G.shbuf->tail); |
283 | } |
284 | #else |
285 | void ipcsyslog_cleanup(void); |
286 | void ipcsyslog_init(void); |
287 | void log_to_shmem(const char *msg); |
288 | #endif /* FEATURE_IPC_SYSLOG */ |
289 | |
290 | |
291 | /* Print a message to the log file. */ |
292 | static void log_locally(time_t now, char *msg) |
293 | { |
294 | struct flock fl; |
295 | int len = strlen(msg); |
296 | |
297 | #if ENABLE_FEATURE_IPC_SYSLOG |
298 | if ((option_mask32 & OPT_circularlog) && G.shbuf) { |
299 | log_to_shmem(msg, len); |
300 | return; |
301 | } |
302 | #endif |
303 | if (G.logFD >= 0) { |
304 | /* Reopen log file every second. This allows admin |
305 | * to delete the file and not worry about restarting us. |
306 | * This costs almost nothing since it happens |
307 | * _at most_ once a second. |
308 | */ |
309 | if (!now) |
310 | now = time(NULL); |
311 | if (G.last_log_time != now) { |
312 | G.last_log_time = now; |
313 | close(G.logFD); |
314 | goto reopen; |
315 | } |
316 | } else { |
317 | reopen: |
318 | G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT |
319 | | O_NOCTTY | O_APPEND | O_NONBLOCK, |
320 | 0666); |
321 | if (G.logFD < 0) { |
322 | /* cannot open logfile? - print to /dev/console then */ |
323 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK); |
324 | if (fd < 0) |
325 | fd = 2; /* then stderr, dammit */ |
326 | full_write(fd, msg, len); |
327 | if (fd != 2) |
328 | close(fd); |
329 | return; |
330 | } |
331 | #if ENABLE_FEATURE_ROTATE_LOGFILE |
332 | { |
333 | struct stat statf; |
334 | G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode)); |
335 | /* bug (mostly harmless): can wrap around if file > 4gb */ |
336 | G.curFileSize = statf.st_size; |
337 | } |
338 | #endif |
339 | } |
340 | |
341 | fl.l_whence = SEEK_SET; |
342 | fl.l_start = 0; |
343 | fl.l_len = 1; |
344 | fl.l_type = F_WRLCK; |
345 | fcntl(G.logFD, F_SETLKW, &fl); |
346 | |
347 | #if ENABLE_FEATURE_ROTATE_LOGFILE |
348 | if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) { |
349 | if (G.logFileRotate) { /* always 0..99 */ |
350 | int i = strlen(G.logFilePath) + 3 + 1; |
351 | char oldFile[i]; |
352 | char newFile[i]; |
353 | i = G.logFileRotate - 1; |
354 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */ |
355 | while (1) { |
356 | sprintf(newFile, "%s.%d", G.logFilePath, i); |
357 | if (i == 0) break; |
358 | sprintf(oldFile, "%s.%d", G.logFilePath, --i); |
359 | /* ignore errors - file might be missing */ |
360 | rename(oldFile, newFile); |
361 | } |
362 | /* newFile == "f.0" now */ |
363 | rename(G.logFilePath, newFile); |
364 | fl.l_type = F_UNLCK; |
365 | fcntl(G.logFD, F_SETLKW, &fl); |
366 | close(G.logFD); |
367 | goto reopen; |
368 | } |
369 | ftruncate(G.logFD, 0); |
370 | } |
371 | G.curFileSize += |
372 | #endif |
373 | full_write(G.logFD, msg, len); |
374 | fl.l_type = F_UNLCK; |
375 | fcntl(G.logFD, F_SETLKW, &fl); |
376 | } |
377 | |
378 | static void parse_fac_prio_20(int pri, char *res20) |
379 | { |
380 | const CODE *c_pri, *c_fac; |
381 | |
382 | if (pri != 0) { |
383 | c_fac = facilitynames; |
384 | while (c_fac->c_name) { |
385 | if (c_fac->c_val != (LOG_FAC(pri) << 3)) { |
386 | c_fac++; |
387 | continue; |
388 | } |
389 | /* facility is found, look for prio */ |
390 | c_pri = prioritynames; |
391 | while (c_pri->c_name) { |
392 | if (c_pri->c_val != LOG_PRI(pri)) { |
393 | c_pri++; |
394 | continue; |
395 | } |
396 | snprintf(res20, 20, "%s.%s", |
397 | c_fac->c_name, c_pri->c_name); |
398 | return; |
399 | } |
400 | /* prio not found, bail out */ |
401 | break; |
402 | } |
403 | snprintf(res20, 20, "<%d>", pri); |
404 | } |
405 | } |
406 | |
407 | /* len parameter is used only for "is there a timestamp?" check. |
408 | * NB: some callers cheat and supply len==0 when they know |
409 | * that there is no timestamp, short-circuiting the test. */ |
410 | static void timestamp_and_log(int pri, char *msg, int len) |
411 | { |
412 | char *timestamp; |
413 | time_t now; |
414 | |
415 | if (len < 16 || msg[3] != ' ' || msg[6] != ' ' |
416 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' ' |
417 | ) { |
418 | time(&now); |
419 | timestamp = ctime(&now) + 4; /* skip day of week */ |
420 | } else { |
421 | now = 0; |
422 | timestamp = msg; |
423 | msg += 16; |
424 | } |
425 | timestamp[15] = '\0'; |
426 | |
427 | if (option_mask32 & OPT_small) |
428 | sprintf(G.printbuf, "%s %s\n", timestamp, msg); |
429 | else { |
430 | char res[20]; |
431 | parse_fac_prio_20(pri, res); |
432 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg); |
433 | } |
434 | |
435 | /* Log message locally (to file or shared mem) */ |
436 | log_locally(now, G.printbuf); |
437 | } |
438 | |
439 | static void timestamp_and_log_internal(const char *msg) |
440 | { |
441 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog)) |
442 | return; |
443 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0); |
444 | } |
445 | |
446 | /* tmpbuf[len] is a NUL byte (set by caller), but there can be other, |
447 | * embedded NULs. Split messages on each of these NULs, parse prio, |
448 | * escape control chars and log each locally. */ |
449 | static void split_escape_and_log(char *tmpbuf, int len) |
450 | { |
451 | char *p = tmpbuf; |
452 | |
453 | tmpbuf += len; |
454 | while (p < tmpbuf) { |
455 | char c; |
456 | char *q = G.parsebuf; |
457 | int pri = (LOG_USER | LOG_NOTICE); |
458 | |
459 | if (*p == '<') { |
460 | /* Parse the magic priority number */ |
461 | pri = bb_strtou(p + 1, &p, 10); |
462 | if (*p == '>') |
463 | p++; |
464 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) |
465 | pri = (LOG_USER | LOG_NOTICE); |
466 | } |
467 | |
468 | while ((c = *p++)) { |
469 | if (c == '\n') |
470 | c = ' '; |
471 | if (!(c & ~0x1f) && c != '\t') { |
472 | *q++ = '^'; |
473 | c += '@'; /* ^@, ^A, ^B... */ |
474 | } |
475 | *q++ = c; |
476 | } |
477 | *q = '\0'; |
478 | |
479 | /* Now log it */ |
480 | if (LOG_PRI(pri) < G.logLevel) |
481 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf); |
482 | } |
483 | } |
484 | |
485 | static void quit_signal(int sig) |
486 | { |
487 | timestamp_and_log_internal("syslogd exiting"); |
488 | puts("syslogd exiting"); |
489 | if (ENABLE_FEATURE_IPC_SYSLOG) |
490 | ipcsyslog_cleanup(); |
491 | kill_myself_with_sig(sig); |
492 | } |
493 | |
494 | #ifdef SYSLOGD_MARK |
495 | static void do_mark(int sig) |
496 | { |
497 | if (G.markInterval) { |
498 | timestamp_and_log_internal("-- MARK --"); |
499 | alarm(G.markInterval); |
500 | } |
501 | } |
502 | #endif |
503 | |
504 | /* Don't inline: prevent struct sockaddr_un to take up space on stack |
505 | * permanently */ |
506 | static NOINLINE int create_socket(void) |
507 | { |
508 | struct sockaddr_un sunx; |
509 | int sock_fd; |
510 | char *dev_log_name; |
511 | |
512 | memset(&sunx, 0, sizeof(sunx)); |
513 | sunx.sun_family = AF_UNIX; |
514 | |
515 | /* Unlink old /dev/log or object it points to. */ |
516 | /* (if it exists, bind will fail) */ |
517 | strcpy(sunx.sun_path, "/dev/log"); |
518 | dev_log_name = xmalloc_follow_symlinks("/dev/log"); |
519 | if (dev_log_name) { |
520 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path)); |
521 | free(dev_log_name); |
522 | } |
523 | unlink(sunx.sun_path); |
524 | |
525 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0); |
526 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx)); |
527 | chmod("/dev/log", 0666); |
528 | |
529 | return sock_fd; |
530 | } |
531 | |
532 | #if ENABLE_FEATURE_REMOTE_LOG |
533 | static int try_to_resolve_remote(void) |
534 | { |
535 | if (!G.remoteAddr) { |
536 | unsigned now = monotonic_sec(); |
537 | |
538 | /* Don't resolve name too often - DNS timeouts can be big */ |
539 | if ((now - G.last_dns_resolve) < DNS_WAIT_SEC) |
540 | return -1; |
541 | G.last_dns_resolve = now; |
542 | G.remoteAddr = host2sockaddr(G.remoteAddrStr, 514); |
543 | if (!G.remoteAddr) |
544 | return -1; |
545 | } |
546 | return socket(G.remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0); |
547 | } |
548 | #endif |
549 | |
550 | static void do_syslogd(void) NORETURN; |
551 | static void do_syslogd(void) |
552 | { |
553 | int sock_fd; |
554 | #if ENABLE_FEATURE_SYSLOGD_DUP |
555 | int last_sz = -1; |
556 | char *last_buf; |
557 | char *recvbuf = G.recvbuf; |
558 | #else |
559 | #define recvbuf (G.recvbuf) |
560 | #endif |
561 | |
562 | /* Set up signal handlers */ |
563 | bb_signals(0 |
564 | + (1 << SIGINT) |
565 | + (1 << SIGTERM) |
566 | + (1 << SIGQUIT) |
567 | , quit_signal); |
568 | signal(SIGHUP, SIG_IGN); |
569 | /* signal(SIGCHLD, SIG_IGN); - why? */ |
570 | #ifdef SYSLOGD_MARK |
571 | signal(SIGALRM, do_mark); |
572 | alarm(G.markInterval); |
573 | #endif |
574 | sock_fd = create_socket(); |
575 | |
576 | if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) { |
577 | ipcsyslog_init(); |
578 | } |
579 | |
580 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER); |
581 | |
582 | for (;;) { |
583 | ssize_t sz; |
584 | |
585 | #if ENABLE_FEATURE_SYSLOGD_DUP |
586 | last_buf = recvbuf; |
587 | if (recvbuf == G.recvbuf) |
588 | recvbuf = G.recvbuf + MAX_READ; |
589 | else |
590 | recvbuf = G.recvbuf; |
591 | #endif |
592 | read_again: |
593 | sz = safe_read(sock_fd, recvbuf, MAX_READ - 1); |
594 | if (sz < 0) |
595 | bb_perror_msg_and_die("read from /dev/log"); |
596 | |
597 | /* Drop trailing '\n' and NULs (typically there is one NUL) */ |
598 | while (1) { |
599 | if (sz == 0) |
600 | goto read_again; |
601 | /* man 3 syslog says: "A trailing newline is added when needed". |
602 | * However, neither glibc nor uclibc do this: |
603 | * syslog(prio, "test") sends "test\0" to /dev/log, |
604 | * syslog(prio, "test\n") sends "test\n\0". |
605 | * IOW: newline is passed verbatim! |
606 | * I take it to mean that it's syslogd's job |
607 | * to make those look identical in the log files. */ |
608 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n') |
609 | break; |
610 | sz--; |
611 | } |
612 | #if ENABLE_FEATURE_SYSLOGD_DUP |
613 | if ((option_mask32 & OPT_dup) && (sz == last_sz)) |
614 | if (memcmp(last_buf, recvbuf, sz) == 0) |
615 | continue; |
616 | last_sz = sz; |
617 | #endif |
618 | #if ENABLE_FEATURE_REMOTE_LOG |
619 | /* We are not modifying log messages in any way before send */ |
620 | /* Remote site cannot trust _us_ anyway and need to do validation again */ |
621 | if (G.remoteAddrStr) { |
622 | if (-1 == G.remoteFD) { |
623 | G.remoteFD = try_to_resolve_remote(); |
624 | if (-1 == G.remoteFD) |
625 | goto no_luck; |
626 | } |
627 | /* Stock syslogd sends it '\n'-terminated |
628 | * over network, mimic that */ |
629 | recvbuf[sz] = '\n'; |
630 | /* send message to remote logger, ignore possible error */ |
631 | /* TODO: on some errors, close and set G.remoteFD to -1 |
632 | * so that DNS resolution and connect is retried? */ |
633 | sendto(G.remoteFD, recvbuf, sz+1, MSG_DONTWAIT, |
634 | &G.remoteAddr->u.sa, G.remoteAddr->len); |
635 | no_luck: ; |
636 | } |
637 | #endif |
638 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) { |
639 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */ |
640 | split_escape_and_log(recvbuf, sz); |
641 | } |
642 | } /* for (;;) */ |
643 | #undef recvbuf |
644 | } |
645 | |
646 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
647 | int syslogd_main(int argc UNUSED_PARAM, char **argv) |
648 | { |
649 | char OPTION_DECL; |
650 | |
651 | INIT_G(); |
652 | #if ENABLE_FEATURE_REMOTE_LOG |
653 | G.last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1; |
654 | #endif |
655 | |
656 | /* do normal option parsing */ |
657 | opt_complementary = "=0"; /* no non-option params */ |
658 | getopt32(argv, OPTION_STR, OPTION_PARAM); |
659 | #ifdef SYSLOGD_MARK |
660 | if (option_mask32 & OPT_mark) // -m |
661 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60; |
662 | #endif |
663 | //if (option_mask32 & OPT_nofork) // -n |
664 | //if (option_mask32 & OPT_outfile) // -O |
665 | if (option_mask32 & OPT_loglevel) // -l |
666 | G.logLevel = xatou_range(opt_l, 1, 8); |
667 | //if (option_mask32 & OPT_small) // -S |
668 | #if ENABLE_FEATURE_ROTATE_LOGFILE |
669 | if (option_mask32 & OPT_filesize) // -s |
670 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024; |
671 | if (option_mask32 & OPT_rotatecnt) // -b |
672 | G.logFileRotate = xatou_range(opt_b, 0, 99); |
673 | #endif |
674 | #if ENABLE_FEATURE_IPC_SYSLOG |
675 | if (opt_C) // -Cn |
676 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024; |
677 | #endif |
678 | |
679 | /* If they have not specified remote logging, then log locally */ |
680 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_remotelog)) |
681 | option_mask32 |= OPT_locallog; |
682 | |
683 | /* Store away localhost's name before the fork */ |
684 | G.hostname = safe_gethostname(); |
685 | *strchrnul(G.hostname, '.') = '\0'; |
686 | |
687 | if (!(option_mask32 & OPT_nofork)) { |
688 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); |
689 | } |
690 | umask(0); |
691 | write_pidfile("/var/run/syslogd.pid"); |
692 | do_syslogd(); |
693 | /* return EXIT_SUCCESS; */ |
694 | } |
695 | |
696 | /* Clean up. Needed because we are included from syslogd_and_logger.c */ |
697 | #undef G |
698 | #undef GLOBALS |
699 | #undef INIT_G |
700 | #undef OPTION_STR |
701 | #undef OPTION_DECL |
702 | #undef OPTION_PARAM |