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1 | /* | |
2 | * Copyright (c) 2015-19 David Lamparter, for NetDEF, Inc. | |
3 | * | |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
17 | #include "zebra.h" | |
18 | ||
19 | #include <sys/un.h> | |
20 | #include <syslog.h> | |
21 | ||
22 | #include "memory.h" | |
23 | #include "frrcu.h" | |
24 | #include "frr_pthread.h" | |
25 | #include "printfrr.h" | |
26 | #include "zlog.h" | |
27 | #include "zlog_targets.h" | |
28 | ||
29 | /* these allocations are intentionally left active even when doing full exit | |
30 | * cleanup, in order to keep the logging subsystem fully functional until the | |
31 | * absolute end. | |
32 | */ | |
33 | ||
34 | DEFINE_MGROUP_ACTIVEATEXIT(LOG, "logging subsystem"); | |
35 | ||
36 | DEFINE_MTYPE_STATIC(LOG, LOG_FD, "log file target"); | |
37 | DEFINE_MTYPE_STATIC(LOG, LOG_FD_NAME, "log file name"); | |
38 | DEFINE_MTYPE_STATIC(LOG, LOG_FD_ROTATE, "log file rotate helper"); | |
39 | DEFINE_MTYPE_STATIC(LOG, LOG_SYSL, "syslog target"); | |
40 | ||
41 | struct zlt_fd { | |
42 | struct zlog_target zt; | |
43 | ||
44 | atomic_uint_fast32_t fd; | |
45 | ||
46 | char ts_subsec; | |
47 | bool record_priority; | |
48 | ||
49 | struct rcu_head_close head_close; | |
50 | }; | |
51 | ||
52 | static const char * const prionames[] = { | |
53 | [LOG_EMERG] = "emergencies: ", | |
54 | [LOG_ALERT] = "alerts: ", | |
55 | [LOG_CRIT] = "critical: ", | |
56 | [LOG_ERR] = "errors: ", | |
57 | [LOG_WARNING] = "warnings: ", | |
58 | [LOG_NOTICE] = "notifications: ", | |
59 | [LOG_INFO] = "informational: ", | |
60 | [LOG_DEBUG] = "debugging: ", | |
61 | }; | |
62 | ||
63 | void zlog_fd(struct zlog_target *zt, struct zlog_msg *msgs[], size_t nmsgs) | |
64 | { | |
65 | struct zlt_fd *zte = container_of(zt, struct zlt_fd, zt); | |
66 | int fd; | |
67 | size_t i, textlen, iovpos = 0; | |
68 | size_t niov = MIN(4 * nmsgs + 1, IOV_MAX); | |
69 | struct iovec iov[niov]; | |
70 | /* "\nYYYY-MM-DD HH:MM:SS.NNNNNNNNN+ZZ:ZZ " = 37 chars */ | |
71 | #define TS_LEN 40 | |
72 | char ts_buf[TS_LEN * nmsgs], *ts_pos = ts_buf; | |
73 | ||
74 | fd = atomic_load_explicit(&zte->fd, memory_order_relaxed); | |
75 | ||
76 | for (i = 0; i < nmsgs; i++) { | |
77 | struct zlog_msg *msg = msgs[i]; | |
78 | int prio = zlog_msg_prio(msg); | |
79 | ||
80 | if (prio <= zt->prio_min) { | |
81 | struct fbuf fbuf = { | |
82 | .buf = ts_buf, | |
83 | .pos = ts_pos, | |
84 | .len = sizeof(ts_buf), | |
85 | }; | |
86 | ||
87 | iov[iovpos].iov_base = ts_pos; | |
88 | zlog_msg_ts(msg, &fbuf, | |
89 | ZLOG_TS_LEGACY | zte->ts_subsec); | |
90 | ts_pos = fbuf.pos; | |
91 | ||
92 | *ts_pos++ = ' '; | |
93 | iov[iovpos].iov_len = | |
94 | ts_pos - (char *)iov[iovpos].iov_base; | |
95 | ||
96 | iovpos++; | |
97 | ||
98 | if (zte->record_priority) { | |
99 | iov[iovpos].iov_base = (char *)prionames[prio]; | |
100 | iov[iovpos].iov_len = | |
101 | strlen(iov[iovpos].iov_base); | |
102 | ||
103 | iovpos++; | |
104 | } | |
105 | ||
106 | iov[iovpos].iov_base = zlog_prefix; | |
107 | iov[iovpos].iov_len = zlog_prefixsz; | |
108 | ||
109 | iovpos++; | |
110 | ||
111 | iov[iovpos].iov_base = | |
112 | (char *)zlog_msg_text(msg, &textlen); | |
113 | iov[iovpos].iov_len = textlen + 1; | |
114 | ||
115 | iovpos++; | |
116 | } | |
117 | ||
118 | /* conditions that trigger writing: | |
119 | * - out of space for more timestamps/headers | |
120 | * - this being the last message in the batch | |
121 | * - not enough remaining iov entries | |
122 | */ | |
123 | if (iovpos > 0 && (ts_buf + sizeof(ts_buf) - ts_pos < TS_LEN | |
124 | || i + 1 == nmsgs | |
125 | || array_size(iov) - iovpos < 5)) { | |
126 | writev(fd, iov, iovpos); | |
127 | ||
128 | iovpos = 0; | |
129 | ts_pos = ts_buf; | |
130 | } | |
131 | } | |
132 | ||
133 | assert(iovpos == 0); | |
134 | } | |
135 | ||
136 | static void zlog_fd_sigsafe(struct zlog_target *zt, const char *text, | |
137 | size_t len) | |
138 | { | |
139 | struct zlt_fd *zte = container_of(zt, struct zlt_fd, zt); | |
140 | struct iovec iov[4]; | |
141 | int fd; | |
142 | ||
143 | iov[0].iov_base = (char *)prionames[LOG_CRIT]; | |
144 | iov[0].iov_len = zte->record_priority ? strlen(iov[0].iov_base) : 0; | |
145 | ||
146 | iov[1].iov_base = zlog_prefix; | |
147 | iov[1].iov_len = zlog_prefixsz; | |
148 | ||
149 | iov[2].iov_base = (char *)text; | |
150 | iov[2].iov_len = len; | |
151 | ||
152 | iov[3].iov_base = (char *)"\n"; | |
153 | iov[3].iov_len = 1; | |
154 | ||
155 | fd = atomic_load_explicit(&zte->fd, memory_order_relaxed); | |
156 | ||
157 | writev(fd, iov, array_size(iov)); | |
158 | } | |
159 | ||
160 | /* | |
161 | * (re-)configuration | |
162 | */ | |
163 | ||
164 | void zlog_file_init(struct zlog_cfg_file *zcf) | |
165 | { | |
166 | memset(zcf, 0, sizeof(*zcf)); | |
167 | zcf->prio_min = ZLOG_DISABLED; | |
168 | zcf->fd = -1; | |
169 | pthread_mutex_init(&zcf->cfg_mtx, NULL); | |
170 | } | |
171 | ||
172 | static void zlog_file_target_free(struct zlt_fd *zlt) | |
173 | { | |
174 | if (!zlt) | |
175 | return; | |
176 | ||
177 | rcu_close(&zlt->head_close, zlt->fd); | |
178 | rcu_free(MTYPE_LOG_FD, zlt, zt.rcu_head); | |
179 | } | |
180 | ||
181 | void zlog_file_fini(struct zlog_cfg_file *zcf) | |
182 | { | |
183 | if (zcf->active) { | |
184 | struct zlt_fd *ztf; | |
185 | struct zlog_target *zt; | |
186 | ||
187 | zt = zlog_target_replace(&zcf->active->zt, NULL); | |
188 | ztf = container_of(zt, struct zlt_fd, zt); | |
189 | zlog_file_target_free(ztf); | |
190 | } | |
191 | XFREE(MTYPE_LOG_FD_NAME, zcf->filename); | |
192 | pthread_mutex_destroy(&zcf->cfg_mtx); | |
193 | } | |
194 | ||
195 | static bool zlog_file_cycle(struct zlog_cfg_file *zcf) | |
196 | { | |
197 | struct zlog_target *zt, *old; | |
198 | struct zlt_fd *zlt = NULL; | |
199 | int fd; | |
200 | bool rv = true; | |
201 | ||
202 | do { | |
203 | if (zcf->prio_min == ZLOG_DISABLED) | |
204 | break; | |
205 | ||
206 | if (zcf->fd != -1) | |
207 | fd = dup(zcf->fd); | |
208 | else if (zcf->filename) | |
209 | fd = open(zcf->filename, | |
210 | O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC | |
211 | | O_NOCTTY, | |
212 | LOGFILE_MASK); | |
213 | else | |
214 | fd = -1; | |
215 | ||
216 | if (fd < 0) { | |
217 | rv = false; | |
218 | break; | |
219 | } | |
220 | ||
221 | zt = zlog_target_clone(MTYPE_LOG_FD, &zcf->active->zt, | |
222 | sizeof(*zlt)); | |
223 | zlt = container_of(zt, struct zlt_fd, zt); | |
224 | ||
225 | zlt->fd = fd; | |
226 | zlt->record_priority = zcf->record_priority; | |
227 | zlt->ts_subsec = zcf->ts_subsec; | |
228 | ||
229 | zlt->zt.prio_min = zcf->prio_min; | |
230 | zlt->zt.logfn = zcf->zlog_wrap ? zcf->zlog_wrap : zlog_fd; | |
231 | zlt->zt.logfn_sigsafe = zlog_fd_sigsafe; | |
232 | } while (0); | |
233 | ||
234 | old = zlog_target_replace(zcf->active ? &zcf->active->zt : NULL, | |
235 | zlt ? &zlt->zt : NULL); | |
236 | zcf->active = zlt; | |
237 | ||
238 | zlog_file_target_free(container_of_null(old, struct zlt_fd, zt)); | |
239 | ||
240 | return rv; | |
241 | } | |
242 | ||
243 | void zlog_file_set_other(struct zlog_cfg_file *zcf) | |
244 | { | |
245 | frr_with_mutex(&zcf->cfg_mtx) { | |
246 | zlog_file_cycle(zcf); | |
247 | } | |
248 | } | |
249 | ||
250 | bool zlog_file_set_filename(struct zlog_cfg_file *zcf, const char *filename) | |
251 | { | |
252 | frr_with_mutex(&zcf->cfg_mtx) { | |
253 | XFREE(MTYPE_LOG_FD_NAME, zcf->filename); | |
254 | zcf->filename = XSTRDUP(MTYPE_LOG_FD_NAME, filename); | |
255 | zcf->fd = -1; | |
256 | ||
257 | return zlog_file_cycle(zcf); | |
258 | } | |
259 | assert(0); | |
260 | } | |
261 | ||
262 | bool zlog_file_set_fd(struct zlog_cfg_file *zcf, int fd) | |
263 | { | |
264 | frr_with_mutex(&zcf->cfg_mtx) { | |
265 | if (zcf->fd == fd) | |
266 | return true; | |
267 | ||
268 | XFREE(MTYPE_LOG_FD_NAME, zcf->filename); | |
269 | zcf->fd = fd; | |
270 | ||
271 | return zlog_file_cycle(zcf); | |
272 | } | |
273 | assert(0); | |
274 | } | |
275 | ||
276 | struct rcu_close_rotate { | |
277 | struct rcu_head_close head_close; | |
278 | struct rcu_head head_self; | |
279 | }; | |
280 | ||
281 | bool zlog_file_rotate(struct zlog_cfg_file *zcf) | |
282 | { | |
283 | struct rcu_close_rotate *rcr; | |
284 | int fd; | |
285 | ||
286 | frr_with_mutex(&zcf->cfg_mtx) { | |
287 | if (!zcf->active || !zcf->filename) | |
288 | return true; | |
289 | ||
290 | fd = open(zcf->filename, | |
291 | O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC | O_NOCTTY, | |
292 | LOGFILE_MASK); | |
293 | if (fd < 0) | |
294 | return false; | |
295 | ||
296 | fd = atomic_exchange_explicit(&zcf->active->fd, | |
297 | (uint_fast32_t)fd, | |
298 | memory_order_relaxed); | |
299 | } | |
300 | ||
301 | rcr = XCALLOC(MTYPE_LOG_FD_ROTATE, sizeof(*rcr)); | |
302 | rcu_close(&rcr->head_close, fd); | |
303 | rcu_free(MTYPE_LOG_FD_ROTATE, rcr, head_self); | |
304 | ||
305 | return true; | |
306 | } | |
307 | ||
308 | /* fixed crash logging */ | |
309 | ||
310 | static struct zlt_fd zlog_crashlog; | |
311 | ||
312 | static void zlog_crashlog_sigsafe(struct zlog_target *zt, const char *text, | |
313 | size_t len) | |
314 | { | |
315 | static int crashlog_fd = -1; | |
316 | ||
317 | if (crashlog_fd == -1) { | |
318 | #ifdef HAVE_OPENAT | |
319 | crashlog_fd = openat(zlog_tmpdirfd, "crashlog", | |
320 | O_WRONLY | O_APPEND | O_CREAT, | |
321 | LOGFILE_MASK); | |
322 | #endif | |
323 | if (crashlog_fd < 0) | |
324 | crashlog_fd = -2; | |
325 | } | |
326 | ||
327 | if (crashlog_fd == -2) | |
328 | return; | |
329 | ||
330 | zlog_crashlog.fd = crashlog_fd; | |
331 | zlog_fd_sigsafe(&zlog_crashlog.zt, text, len); | |
332 | } | |
333 | ||
334 | /* this is used for assert failures (they don't need AS-Safe logging) */ | |
335 | static void zlog_crashlog_plain(struct zlog_target *zt, struct zlog_msg *msgs[], | |
336 | size_t nmsgs) | |
337 | { | |
338 | size_t i, len; | |
339 | const char *text; | |
340 | ||
341 | for (i = 0; i < nmsgs; i++) { | |
342 | if (zlog_msg_prio(msgs[i]) > zt->prio_min) | |
343 | continue; | |
344 | ||
345 | text = zlog_msg_text(msgs[i], &len); | |
346 | zlog_crashlog_sigsafe(zt, text, len); | |
347 | } | |
348 | } | |
349 | ||
350 | static void zlog_crashlog_init(void) | |
351 | { | |
352 | zlog_crashlog.zt.prio_min = LOG_CRIT; | |
353 | zlog_crashlog.zt.logfn = zlog_crashlog_plain; | |
354 | zlog_crashlog.zt.logfn_sigsafe = zlog_crashlog_sigsafe; | |
355 | zlog_crashlog.fd = -1; | |
356 | ||
357 | zlog_target_replace(NULL, &zlog_crashlog.zt); | |
358 | } | |
359 | ||
360 | /* fixed logging for test/auxiliary programs */ | |
361 | ||
362 | static struct zlt_fd zlog_aux_stdout; | |
363 | static bool zlog_is_aux; | |
364 | ||
365 | static int zlt_aux_init(const char *prefix, int prio_min) | |
366 | { | |
367 | zlog_is_aux = true; | |
368 | ||
369 | zlog_aux_stdout.zt.prio_min = prio_min; | |
370 | zlog_aux_stdout.zt.logfn = zlog_fd; | |
371 | zlog_aux_stdout.zt.logfn_sigsafe = zlog_fd_sigsafe; | |
372 | zlog_aux_stdout.fd = STDOUT_FILENO; | |
373 | ||
374 | zlog_target_replace(NULL, &zlog_aux_stdout.zt); | |
375 | zlog_startup_end(); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int zlt_init(const char *progname, const char *protoname, | |
380 | unsigned short instance, uid_t uid, gid_t gid) | |
381 | { | |
382 | openlog(progname, LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON); | |
383 | return 0; | |
384 | } | |
385 | ||
386 | static int zlt_fini(void) | |
387 | { | |
388 | closelog(); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* fixed startup logging to stderr */ | |
393 | ||
394 | static struct zlt_fd zlog_startup_stderr; | |
395 | ||
396 | __attribute__((_CONSTRUCTOR(450))) static void zlog_startup_init(void) | |
397 | { | |
398 | zlog_startup_stderr.zt.prio_min = LOG_WARNING; | |
399 | zlog_startup_stderr.zt.logfn = zlog_fd; | |
400 | zlog_startup_stderr.zt.logfn_sigsafe = zlog_fd_sigsafe; | |
401 | zlog_startup_stderr.fd = STDERR_FILENO; | |
402 | ||
403 | zlog_target_replace(NULL, &zlog_startup_stderr.zt); | |
404 | ||
405 | hook_register(zlog_aux_init, zlt_aux_init); | |
406 | hook_register(zlog_init, zlt_init); | |
407 | hook_register(zlog_fini, zlt_fini); | |
408 | } | |
409 | ||
410 | void zlog_startup_end(void) | |
411 | { | |
412 | static bool startup_ended = false; | |
413 | ||
414 | if (startup_ended) | |
415 | return; | |
416 | startup_ended = true; | |
417 | ||
418 | zlog_target_replace(&zlog_startup_stderr.zt, NULL); | |
419 | ||
420 | if (zlog_is_aux) | |
421 | return; | |
422 | ||
423 | /* until here, crashlogs go to stderr */ | |
424 | zlog_crashlog_init(); | |
425 | } | |
426 | ||
427 | /* syslog */ | |
428 | ||
429 | struct zlt_syslog { | |
430 | struct zlog_target zt; | |
431 | ||
432 | int syslog_facility; | |
433 | }; | |
434 | ||
435 | static void zlog_syslog(struct zlog_target *zt, struct zlog_msg *msgs[], | |
436 | size_t nmsgs) | |
437 | { | |
438 | size_t i; | |
439 | struct zlt_syslog *zte = container_of(zt, struct zlt_syslog, zt); | |
440 | const char *text; | |
441 | size_t text_len; | |
442 | ||
443 | for (i = 0; i < nmsgs; i++) { | |
444 | if (zlog_msg_prio(msgs[i]) > zt->prio_min) | |
445 | continue; | |
446 | ||
447 | text = zlog_msg_text(msgs[i], &text_len); | |
448 | syslog(zlog_msg_prio(msgs[i]) | zte->syslog_facility, "%.*s", | |
449 | (int)text_len, text); | |
450 | } | |
451 | } | |
452 | ||
453 | #ifndef _PATH_LOG | |
454 | #define _PATH_LOG "/dev/log" | |
455 | #endif | |
456 | ||
457 | static void zlog_syslog_sigsafe(struct zlog_target *zt, const char *text, | |
458 | size_t len) | |
459 | { | |
460 | static int syslog_fd = -1; | |
461 | ||
462 | char hdr[192]; | |
463 | size_t hdrlen; | |
464 | struct iovec iov[2]; | |
465 | ||
466 | if (syslog_fd == -1) { | |
467 | syslog_fd = socket(AF_UNIX, SOCK_DGRAM, 0); | |
468 | if (syslog_fd >= 0) { | |
469 | struct sockaddr_un sa; | |
470 | socklen_t salen = sizeof(sa); | |
471 | ||
472 | sa.sun_family = AF_UNIX; | |
473 | strlcpy(sa.sun_path, _PATH_LOG, sizeof(sa.sun_path)); | |
474 | #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN | |
475 | salen = sa.sun_len = SUN_LEN(&sa); | |
476 | #endif | |
477 | if (connect(syslog_fd, (struct sockaddr *)&sa, salen)) { | |
478 | close(syslog_fd); | |
479 | syslog_fd = -1; | |
480 | } | |
481 | } | |
482 | ||
483 | /* /dev/log could be a fifo instead of a socket */ | |
484 | if (syslog_fd == -1) { | |
485 | syslog_fd = open(_PATH_LOG, O_WRONLY | O_NOCTTY); | |
486 | if (syslog_fd < 0) | |
487 | /* give up ... */ | |
488 | syslog_fd = -2; | |
489 | } | |
490 | } | |
491 | ||
492 | if (syslog_fd == -2) | |
493 | return; | |
494 | ||
495 | /* note zlog_prefix includes trailing ": ", need to cut off 2 chars */ | |
496 | hdrlen = snprintfrr(hdr, sizeof(hdr), "<%d>%.*s[%ld]: ", LOG_CRIT, | |
497 | zlog_prefixsz > 2 ? (int)(zlog_prefixsz - 2) : 0, | |
498 | zlog_prefix, (long)getpid()); | |
499 | ||
500 | iov[0].iov_base = hdr; | |
501 | iov[0].iov_len = hdrlen; | |
502 | ||
503 | iov[1].iov_base = (char *)text; | |
504 | iov[1].iov_len = len; | |
505 | ||
506 | writev(syslog_fd, iov, array_size(iov)); | |
507 | } | |
508 | ||
509 | ||
510 | static pthread_mutex_t syslog_cfg_mutex = PTHREAD_MUTEX_INITIALIZER; | |
511 | static struct zlt_syslog *zlt_syslog; | |
512 | static int syslog_facility = LOG_DAEMON; | |
513 | static int syslog_prio_min = ZLOG_DISABLED; | |
514 | ||
515 | void zlog_syslog_set_facility(int facility) | |
516 | { | |
517 | struct zlog_target *newztc; | |
518 | struct zlt_syslog *newzt; | |
519 | ||
520 | frr_with_mutex(&syslog_cfg_mutex) { | |
521 | if (facility == syslog_facility) | |
522 | return; | |
523 | syslog_facility = facility; | |
524 | ||
525 | if (syslog_prio_min == ZLOG_DISABLED) | |
526 | return; | |
527 | ||
528 | newztc = zlog_target_clone(MTYPE_LOG_SYSL, &zlt_syslog->zt, | |
529 | sizeof(*newzt)); | |
530 | newzt = container_of(newztc, struct zlt_syslog, zt); | |
531 | newzt->syslog_facility = syslog_facility; | |
532 | ||
533 | zlog_target_free(MTYPE_LOG_SYSL, | |
534 | zlog_target_replace(&zlt_syslog->zt, | |
535 | &newzt->zt)); | |
536 | ||
537 | zlt_syslog = newzt; | |
538 | } | |
539 | } | |
540 | ||
541 | int zlog_syslog_get_facility(void) | |
542 | { | |
543 | frr_with_mutex(&syslog_cfg_mutex) { | |
544 | return syslog_facility; | |
545 | } | |
546 | assert(0); | |
547 | } | |
548 | ||
549 | void zlog_syslog_set_prio_min(int prio_min) | |
550 | { | |
551 | struct zlog_target *newztc; | |
552 | struct zlt_syslog *newzt = NULL; | |
553 | ||
554 | frr_with_mutex(&syslog_cfg_mutex) { | |
555 | if (prio_min == syslog_prio_min) | |
556 | return; | |
557 | syslog_prio_min = prio_min; | |
558 | ||
559 | if (syslog_prio_min != ZLOG_DISABLED) { | |
560 | newztc = zlog_target_clone(MTYPE_LOG_SYSL, | |
561 | &zlt_syslog->zt, | |
562 | sizeof(*newzt)); | |
563 | newzt = container_of(newztc, struct zlt_syslog, zt); | |
564 | newzt->zt.prio_min = prio_min; | |
565 | newzt->zt.logfn = zlog_syslog; | |
566 | newzt->zt.logfn_sigsafe = zlog_syslog_sigsafe; | |
567 | newzt->syslog_facility = syslog_facility; | |
568 | } | |
569 | ||
570 | zlog_target_free(MTYPE_LOG_SYSL, | |
571 | zlog_target_replace(&zlt_syslog->zt, | |
572 | &newzt->zt)); | |
573 | ||
574 | zlt_syslog = newzt; | |
575 | } | |
576 | } | |
577 | ||
578 | int zlog_syslog_get_prio_min(void) | |
579 | { | |
580 | frr_with_mutex(&syslog_cfg_mutex) { | |
581 | return syslog_prio_min; | |
582 | } | |
583 | assert(0); | |
584 | } |