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38 #include "deduplicate.h"
39 #include <dynamic_config.h>
41 #include <logcommon.h>
42 #include "logconfig.h"
43 #include "loglimiter.h"
45 #define DEFAULT_CONFIG_LIMITER false
46 #define DEFAULT_CONFIG_PLOG true
47 #define DEFAULT_CONFIG_DEBUGMODE 0
48 #define DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS 0
51 * @brief Points to a function which writes a log message
52 * @details The function pointed to depends on the backend used
53 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
54 * @param[in] prio Priority of the message.
55 * @param[in] tag The message tag, identifies the sender.
56 * @param[in] msg The contents of the message.
57 * @return Returns the number of bytes written on success and a negative error value on error.
58 * @see __dlog_init_backend
60 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg, struct timespec *tp_mono) = NULL;
61 void (*destroy_backend)(void);
63 int (*stash_failed_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = NULL;
65 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg);
68 pthread_rwlock_t log_limiter_lock = PTHREAD_RWLOCK_INITIALIZER;
69 static pthread_mutex_t log_construction_lock = PTHREAD_MUTEX_INITIALIZER;
70 static bool is_initialized = false;
72 extern void __dlog_init_pipe(const struct log_config *conf);
73 extern void __dlog_init_android(const struct log_config *conf);
75 extern void prepend_container_tag_if_in_container(size_t buf_size, char buf[static buf_size], int *len);
78 struct limiter_data *limiter_data;
79 static bool dynamic_config;
80 static bool plog[LOG_ID_MAX];
81 static bool plog_default_values[LOG_ID_MAX];
82 static bool enable_secure_logs = true;
83 static bool enable_critical = true;
86 static int fatal_assert;
87 static int limiter_apply_to_all_buffers;
88 static _Atomic log_priority priority_filter_level = DLOG_VERBOSE;
90 /* Here, static_config is the original config from /etc/dlog.conf{,.d} which can be overriden,
91 * but comes back if the override is removed. both_config additionally contains dynamic rules
92 * (by default from /run/dlog/filters.d) which can be changed in the runtime.
93 * The static_config has to be kept separately, so that we can go back to it when dynamic rules change.
94 * Note that most functions only use static_config, since the parameters can't be changed in runtime. */
95 static void __configure_limiter(struct log_config *static_config, struct log_config *both_config)
97 assert(static_config);
104 limiter_data = __log_limiter_create(static_config);
105 if (limiter_data && dynamic_config)
106 __log_limiter_update(limiter_data, both_config);
107 limiter = (bool)limiter_data;
110 static int __configure_backend(struct log_config *config)
114 const char *const backend = log_config_claim_backend(config);
118 if (!strcmp(backend, "pipe"))
119 __dlog_init_pipe(config);
120 else if (!strcmp(backend, "logger"))
121 __dlog_init_android(config);
128 static void __set_plog_default_values(void)
130 for (size_t i = 0; i < NELEMS(plog); ++i)
131 plog_default_values[i] = plog[i];
134 static void __initialize_plog(const struct log_config *config)
138 const bool plog_default = log_config_get_boolean(config, "plog", DEFAULT_CONFIG_PLOG);
139 for (size_t i = 0; i < NELEMS(plog); ++i)
140 plog[i] = plog_default;
141 plog[LOG_ID_APPS] = true; // the default does not apply here for backward compatibility reasons.
142 __set_plog_default_values();
145 static void __configure_parameters(struct log_config *static_config, struct log_config *both_config)
147 assert(static_config);
150 __initialize_plog(static_config);
151 __update_plog(static_config);
152 /* Like in __configure_limiter, we also check the dynamic rules. However, we make sure to
153 * set the default values to the ones generated by the static rules first. */
154 __set_plog_default_values();
155 __update_plog(both_config);
157 enable_secure_logs = log_config_get_boolean(both_config, "enable_secure_logs", enable_secure_logs);
158 enable_critical = log_config_get_boolean(both_config, "enable_critical", enable_critical);
159 debugmode = log_config_get_int(both_config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
160 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
161 limiter = log_config_get_boolean(both_config, "limiter", DEFAULT_CONFIG_LIMITER);
162 limiter_apply_to_all_buffers = log_config_get_int(both_config,
163 "limiter_apply_to_all_buffers",
164 DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS);
166 stash_failed_log = NULL;
167 const char *stash_failed_log_method = log_config_get(both_config, "stash_failed_log_method");
168 if (stash_failed_log_method) {
170 if (strcmp(stash_failed_log_method, "critical") == 0)
171 stash_failed_log = stash_critical;
176 void __update_plog(const struct log_config *conf)
180 for (size_t i = 0; i < NELEMS(plog); ++i) {
181 char key[MAX_CONF_KEY_LEN];
182 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
185 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
190 * @brief Configure the library
191 * @details Reads relevant config values
192 * @remarks This is more or less a constructor, but there are some obstacles
193 * to using it as such (i.e. with attribute constructor):
195 * - some important pieces of the system link to dlog, they start very early
196 * such that dlog can't properly initialize (which lasts for program lifetime)
197 * but don't actually log anything until later on and would be fine under lazy
198 * initialisation. The way to do it "properly" would be to expose this function
199 * into the API so that people can manually call it when they're ready, but
200 * one of the design goals of the current API is that it requires absolutely no
201 * other calls than `dlog_print`. Changing it would require somebody with a
202 * bird's eye view of the system to produce a design so I wouldn't count on it.
204 * - the constructor would need to have as high of a priority as possible (so as
205 * to minimize the risk of another library's constructor using uninitialized data)
206 * but at the same time others might want some room to wrap functions before
207 * dlog uses them (think mprobe/mcheck). This would also require a design pass.
212 bool __configure(void)
214 __attribute__((cleanup(log_config_free))) struct log_config static_config = {};
215 __attribute__((cleanup(log_config_free))) struct log_config both_config = {};
217 if (log_config_read(&static_config) < 0)
219 log_config_copy(&both_config, &static_config);
221 dynamic_config = __dynamic_config_create(&both_config);
223 __configure_parameters(&static_config, &both_config);
225 if (!__configure_backend(&both_config)) {
226 __dynamic_config_destroy();
227 dynamic_config = false;
231 __configure_deduplicate(&both_config);
232 __configure_limiter(&static_config, &both_config);
236 static void __attribute__((constructor(101))) __install_pipe_handler(void)
238 /* We mask SIGPIPE signal because most applications do not install their
239 * own SIGPIPE handler. Default behaviour in SIGPIPE case is to abort the
240 * process. SIGPIPE occurs when e.g. dlog daemon closes read pipe endpoint.
242 * We do this in the library constructor (at maximum priority) and not
243 * during regular (lazy) initialisation so as to prevent overwriting the
244 * program's actual signal handler, if it has one.
246 * In theory this is not required for the Android logger backend; however,
247 * this early we don't yet know the backend and also it is good to behave
248 * consistently in this regard anyway.
250 * We don't revert this in a destructor because Unix signals are bonkers
251 * and we have no way to do this cleanly. Most libdlog users don't use
252 * runtime linking so this would mostly done at program exit either way. */
253 signal(SIGPIPE, SIG_IGN);
256 static void __attribute__((constructor(102))) __set_output_buffering(void)
258 /* If stdout and/or stderr is redirected to dlog (service, driver)
259 * it is best if we buffer lines, otherwise the following can happen:
260 * - no buffering: service/driver recives every single byte (precisely
261 * every single write*(2) call), causing it to either buffer the data
262 * anyway (service), or print logs at random places (driver)
263 * - full buffering: service/driver receives several hundred lines,
264 * which results in one giant entry being added (driver) or long delays
265 * before logs appear (service) */
266 if (getenv(DLOG_ENV_STDOUT_LINE_BUFFERED))
269 if (getenv(DLOG_ENV_STDERR_LINE_BUFFERED))
273 static bool first = true;
274 static bool initialize(void)
279 /* The mutex acts as a barrier, but otherwise the C language's
280 * machine abstraction is single-threaded. This means that the
281 * compiler is free to rearrange calls inside the mutex according
282 * to the as-if rule because it doesn't care if another thread can
283 * access it in parallel. In particular, `is_initialized = true`
284 * directly after `__configure()` could be rearranged to go in
285 * front of it because it is not touched inside that function
286 * if the compiler thinks it helps somehow (not unlikely: since
287 * it is checked before the mutex, it is very probable for it to
288 * still be in the CPU register or something like that). On top
289 * of that, some architectures (in particular, armv7l) don't have
290 * strict memory guarantees and can reorder actual memory stores
291 * on their own, even if the compiler didn't do anything fancy
292 * when creating machine code. For more info about the issue,
293 * see https://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
295 * Ultimately this means that there needs to be some sort of
296 * barrier between `__configure` and `is_initialized = true`,
297 * and the simplest way to achieve that is to just wait until
298 * the second entry into the mutex. */
301 pthread_mutex_lock(&log_construction_lock);
303 first = !__configure();
305 is_initialized = true;
307 pthread_mutex_unlock(&log_construction_lock);
312 * @brief Fatal assertion
313 * @details Conditionally crash the sucka who sent the log
314 * @param[in] prio Priority of the log
316 static void __dlog_fatal_assert(int prio)
318 assert(!fatal_assert || (prio != DLOG_FATAL));
322 * @brief Check log validity
323 * @details Checks whether the log is valid and eligible for printing
324 * @param[in] log_id The target buffer ID
325 * @param[in] prio The log's priority
326 * @param[in] tag The log's tag
327 * @return DLOG_ERROR_NONE on success, else an error code.
328 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
330 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
334 return DLOG_ERROR_INVALID_PARAMETER;
336 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
337 return DLOG_ERROR_INVALID_PARAMETER;
339 return DLOG_ERROR_NONE;
343 * @brief Check log against limiter rules
344 * @details Checks whether the log passes current limiter rules
345 * @param[in] log_id The target buffer ID
346 * @param[in] prio The log's priority
347 * @param[in] tag The log's tag
348 * @return DLOG_ERROR_NONE on success, else an error code.
349 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
351 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
353 if (!debugmode && prio <= DLOG_DEBUG)
354 return DLOG_ERROR_NOT_PERMITTED;
357 __dynamic_config_update(limiter_data);
360 struct pass_log_result should_log = { .decision = DECISION_DENIED };
362 /* Since the only `wrlock` is done by the dynamic config, we can avoid
363 * the `rdlock` entirely if the config is static. This sounds unsafe
364 * but lets us save an entire syscall, which is a lot (both comparatively
365 * and because it compounds). */
366 if (!dynamic_config || !pthread_rwlock_rdlock(&log_limiter_lock)) {
367 should_log = __log_limiter_pass_log(limiter_data, tag, prio);
369 pthread_rwlock_unlock(&log_limiter_lock);
372 switch (should_log.decision) {
373 case DECISION_DENIED:
374 return DLOG_ERROR_NOT_PERMITTED;
376 case DECISION_TAG_LIMIT_EXCEEDED_MESSAGE:
377 case DECISION_PID_LIMIT_EXCEEDED_MESSAGE: {
379 int result = clock_gettime(CLOCK_MONOTONIC, &tp);
381 return DLOG_ERROR_NOT_PERMITTED;
383 snprintf(buf, sizeof(buf),
384 "Your log has been blocked due to per-%s limit of %d logs per %d seconds.",
385 should_log.decision == DECISION_TAG_LIMIT_EXCEEDED_MESSAGE ? "tag" : "PID",
386 should_log.logs_per_period, should_log.period_s);
387 write_to_log(log_id, prio, tag, buf, &tp);
388 return DLOG_ERROR_NOT_PERMITTED;
391 case DECISION_ALLOWED:
396 /* This can change due to __dynamic_config_update(), but is atomic and its
397 * value implies nothing else so does not need to be under a lock. */
399 return DLOG_ERROR_NOT_PERMITTED;
401 return DLOG_ERROR_NONE;
404 static int __write_to_log_critical_section(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap, bool check_should_log)
406 if ((check_should_log || limiter_apply_to_all_buffers) && (dlog_check_limiter(log_id, prio, tag) < 0))
407 return DLOG_ERROR_NONE;
409 char buf[LOG_MAX_PAYLOAD_SIZE];
410 int len = vsnprintf(buf, sizeof buf, fmt, ap);
412 return DLOG_ERROR_NONE;
413 else if (len >= sizeof buf)
414 len = sizeof buf - 1;
416 // Temporary workaround, see temporary.c
417 prepend_container_tag_if_in_container(sizeof buf, buf, &len);
421 if (deduplicate_func && !clock_gettime(CLOCK_MONOTONIC, &tp)) {
422 dlog_deduplicate_e ret = deduplicate_func(buf, len, &tp);
423 if (ret == DLOG_DEDUPLICATE)
424 return DLOG_ERROR_NONE;
425 else if (ret == DLOG_DO_NOT_DEDUPLICATE_BUT_WARN)
426 deduplicate_warn(buf, sizeof buf, len);
427 r = write_to_log(log_id, prio, tag, buf, &tp);
429 r = write_to_log(log_id, prio, tag, buf, NULL);
431 if (r < 0 && stash_failed_log)
432 r = stash_failed_log(log_id, prio, tag, buf);
437 static int __write_to_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap, bool check_should_log, bool secure_log)
439 int ret = dlog_check_validity(log_id, prio, tag);
443 if (check_should_log && prio < priority_filter_level)
444 return DLOG_ERROR_NONE;
446 /* Threads can be cancelled before they give up a lock.
447 * Therefore cancellation is temporarily disabled.
448 * This solution is comparatively simple and cheap.
449 * The other solutions (cleanup handlers, robust mutexes)
450 * would be much more complicated and also inflict larger
451 * runtime costs. The downside of disabling cancellation
452 * is not a problem in our case because it is temporary
453 * and very brief so we don't keep an obsolete thread
454 * for much longer than we otherwise would. */
455 int old_cancel_state;
456 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancel_state);
458 /* The only thing that needs to be protected here is `write_to_log` since
459 * all other resources already have their own specific locks (and even the
460 * pointer could be made to point at a null handler instead of a true NULL)
461 * but giving this guarantee makes everything a lot simpler as it removes
462 * the risk of something suddenly becoming NULL during processing. */
463 if (!initialize() || !write_to_log)
464 // TODO: We could consider stashing the failed log here
465 ret = DLOG_ERROR_NOT_PERMITTED;
466 else if (secure_log && !enable_secure_logs)
469 ret = __write_to_log_critical_section(log_id, prio, tag, fmt, ap, check_should_log);
471 pthread_setcancelstate(old_cancel_state, NULL);
476 int __critical_log_append_timestamp(char *buf, size_t buflen)
478 /* NB: the timestamp may slightly differ from the one that gets
479 * added onto the copy that goes into the regular buffer, and
480 * timestamp acquisition is duplicated. This would ideally be
481 * solved, but timestamps are currently added fairly deep in
482 * backend-specific functions so for now this will have to do.
483 * Also, since we're the sender, there is just this one set of
484 * timestamps, i.e. the send timestamp! The usual alternative
485 * set of receive timestamps will never have the opportunity
486 * to get added to the entry since this log is supposed to end
487 * up straight in the file (there's potentially the trusted
488 * writer binary but we're trying to keep the set of actions
489 * it needs to do to the minimum and those timestamps would
490 * in practice be the same anyway). */
493 clock_gettime(CLOCK_REALTIME, &ts);
494 const time_t tt = ts.tv_sec;
495 const long int real_millisec = ts.tv_nsec / 1000000;
496 clock_gettime(CLOCK_MONOTONIC, &ts);
498 struct tm *const ptm = localtime_r(&tt, &tmBuf);
499 assert(ptm); // we're in a short lived fork so asserts are fine and make things simple
501 int len = strftime(buf, buflen, "%m-%d %H:%M:%S", ptm);
504 int tmp_len = snprintf(buf + len, buflen - len, ".%03ld", real_millisec);
506 assert(tmp_len < buflen - len);
509 tmp_len = strftime(buf + len, buflen - len, "%z ", ptm);
510 assert(tmp_len != 0);
513 tmp_len = snprintf(buf + len, buflen - len, "%5lu.%03ld", ts.tv_sec, ts.tv_nsec / 1000000);
515 assert(tmp_len < buflen - len);
521 int __critical_log_build_msg(char *buf, size_t buflen, pid_t main_pid, pid_t main_tid, log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
523 int len = __critical_log_append_timestamp(buf, buflen);
524 const int metadata_len = snprintf(buf + len, buflen - len, " P%5d T%5d B%-6s %c/%-8s: ",
527 log_name_by_id(log_id),
528 filter_pri_to_char(prio),
529 tag ?: "CRITICAL_NO_TAG");
530 assert(metadata_len > 0);
531 if (metadata_len >= buflen - len)
532 return buflen - 1; // can genuinely happen with an exceedingly large tag
535 const int content_len = vsnprintf(buf + len, buflen - len, fmt, ap);
536 assert(content_len >= 0); // 0 is legit with format == ""
537 if (content_len >= buflen - len)
545 __attribute__ ((noreturn))
547 void __critical_log_child(pid_t main_pid, pid_t main_tid, log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
549 char buf[LOG_MAX_PAYLOAD_SIZE + 128]; // extra space for some metadata
550 const int len = __critical_log_build_msg(buf, sizeof buf - 1, main_pid, main_tid, log_id, prio, tag, fmt, ap);
554 static const char *const path = "/usr/libexec/dlog-log-critical";
555 execl(path, path /* argv[0] convention */, buf, (char *) NULL);
558 /* Compilers are sometimes smart enough to recognize _exit's
559 * noreturn attribute, even if we wrap it with something that
560 * returns. This causes it to behave in unexpected ways, for
561 * example it can blow up the program regardless or it can
562 * optimize some conditionals out (and incorrectly enter them
563 * after the exit call fails to actually exit). This makes it
564 * unsuitable for tests. */
566 _exit(1); // not the regular `exit` so as not to trigger any `atexit` handlers prematurely
570 #ifndef UNIT_TEST // contains forks and exits, these don't work well with wrapping (see above)
571 void __critical_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
573 /* Critical log functionality is mostly done in a separate binary
574 * to handle security correctly (else every process would have to
575 * possess the necessary privilege to write onto that file, which
576 * would be opening a fairly nasty can of worms from the security
577 * point of view). Our use of exec() is why a simple thread would
578 * not suffice and we're resorting to a fork.
580 * The double fork, much like a double barreled 12 gauge shotgun,
581 * is an elegant solution designed to stop a zombie army. We'd be
582 * creating zombie processes if we didn't wait() for the children
583 * we spawn, but we don't really want to do that since it results
584 * in a needless delay. Instead, the writer process is actually a
585 * grandchild, with our direct child exiting immediately just for
586 * us to have something to wait on that is guaranteed not to take
587 * too long. The orphaned grandchild is adopted by init, who will
588 * take care to reap it when it dies. In addition to avoiding the
589 * delay, the client will not have any unexpected children (which
590 * could ruin logic in its own waits).
593 * ┌───────┐ ┌─────────┐ ┌─────────────┐ ┌────────┐
594 * │ pid 1 ├──>│ libdlog ├──>│ immediately ├──>│ execs │
595 * │ init │ │ client │ │ exits │ │ writer │
596 * └───────┘ └─────────┘ └─────────────┘ └────────┘
598 * Afterwards, libdlog has no children:
599 * ┌───────┐ ┌─────────┐ ┌────────┐
600 * │ pid 1 ├──>│ libdlog │ ┌─────────>│ writer │
601 * │ init ├─┐ │ client │ │ │ binary │
602 * └───────┘ │ └─────────┘ │ └────────┘
603 * └──────────────────────┘
608 if (!enable_critical)
611 const pid_t main_pid = getpid();
612 const pid_t main_tid = gettid();
614 const int temporary_exiter_pid = fork();
615 if (temporary_exiter_pid < 0)
617 if (temporary_exiter_pid != 0) {
618 waitpid(temporary_exiter_pid, NULL, 0);
622 const int child_pid = fork();
628 __critical_log_child(main_pid, main_tid, log_id, prio, tag, fmt, ap);
631 static void stash_critical_inner(log_id_t log_id, log_priority prio, const char *tag, const char *fmt, ...)
636 __critical_log(log_id, prio, tag, fmt, ap);
640 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg)
642 stash_critical_inner(log_id, prio, tag, "FAILED TO LOG: %s", msg);
646 EXPORT_API int __dlog_critical_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
651 __critical_log(log_id, prio, tag, fmt, ap);
655 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
662 EXPORT_API int dlog_set_minimum_priority(int priority)
664 if (priority < DLOG_DEFAULT || priority > DLOG_PRIO_MAX)
665 return DLOG_ERROR_INVALID_PARAMETER;
667 priority_filter_level = priority;
668 return DLOG_ERROR_NONE;
673 * @details Print a log line
674 * @param[in] log_id The target buffer ID
675 * @param[in] prio Priority
677 * @param[in] fmt Format (same as printf)
678 * @param[in] ap Argument list
679 * @return Bytes written, or negative error
681 EXPORT_API int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
683 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, false);
684 __dlog_fatal_assert(prio);
691 * @details Print a log line
692 * @param[in] log_id The target buffer ID
693 * @param[in] prio Priority
695 * @param[in] fmt Format (same as printf)
696 * @return Bytes written, or negative error
698 EXPORT_API int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
703 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
711 * @details Print a log line
712 * @param[in] log_id The target buffer ID
713 * @param[in] prio Priority
715 * @param[in] fmt Format (same as printf)
716 * @return Bytes written, or negative error
718 EXPORT_API int __dlog_sec_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
720 if (!enable_secure_logs)
726 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, true);
727 __dlog_fatal_assert(prio);
733 EXPORT_API int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
735 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false, false);
738 EXPORT_API int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
743 int ret = dlog_vprint(prio, tag, fmt, ap);
750 * @brief Finalize DLog
751 * @details Finalizes and deallocates the library
752 * @notes Used directly in tests; brings back the pre-init state
754 void __dlog_fini(void)
756 if (destroy_backend) {
758 destroy_backend = NULL;
761 stash_failed_log = NULL;
762 is_initialized = false;
765 enable_secure_logs = true;
766 enable_critical = false;
767 __deduplicate_destroy();
768 __log_limiter_destroy(limiter_data);
770 __dynamic_config_destroy();