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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);
76 static bool dynamic_config;
77 static bool plog[LOG_ID_MAX];
78 static bool plog_default_values[LOG_ID_MAX];
79 static bool enable_secure_logs = true;
80 static bool enable_critical = true;
83 static int fatal_assert;
84 static int limiter_apply_to_all_buffers;
85 static _Atomic log_priority priority_filter_level = DLOG_VERBOSE;
87 /* Here, static_config is the original config from /etc/dlog.conf{,.d} which can be overriden,
88 * but comes back if the override is removed. both_config additionally contains dynamic rules
89 * (by default from /run/dlog/filters.d) which can be changed in the runtime.
90 * The static_config has to be kept separately, so that we can go back to it when dynamic rules change.
91 * Note that most functions only use static_config, since the parameters can't be changed in runtime. */
92 static void __configure_limiter(struct log_config *static_config, struct log_config *both_config)
94 assert(static_config);
101 limiter = __log_limiter_create(static_config);
102 if (limiter && dynamic_config)
103 __log_limiter_update(both_config);
106 static int __configure_backend(struct log_config *config)
110 const char *const backend = log_config_get(config, "backend");
114 if (!strcmp(backend, "pipe"))
115 __dlog_init_pipe(config);
116 else if (!strcmp(backend, "logger"))
117 __dlog_init_android(config);
124 static void __set_plog_default_values(void)
126 for (size_t i = 0; i < NELEMS(plog); ++i)
127 plog_default_values[i] = plog[i];
130 static void __initialize_plog(const struct log_config *config)
134 const bool plog_default = log_config_get_boolean(config, "plog", DEFAULT_CONFIG_PLOG);
135 for (size_t i = 0; i < NELEMS(plog); ++i)
136 plog[i] = plog_default;
137 plog[LOG_ID_APPS] = true; // the default does not apply here for backward compatibility reasons.
138 __set_plog_default_values();
141 static void __configure_parameters(struct log_config *static_config, struct log_config *both_config)
143 assert(static_config);
146 __initialize_plog(static_config);
147 __update_plog(static_config);
148 /* Like in __configure_limiter, we also check the dynamic rules. However, we make sure to
149 * set the default values to the ones generated by the static rules first. */
150 __set_plog_default_values();
151 __update_plog(both_config);
153 enable_secure_logs = log_config_get_boolean(both_config, "enable_secure_logs", enable_secure_logs);
154 enable_critical = log_config_get_boolean(both_config, "enable_critical", enable_critical);
155 debugmode = log_config_get_int(both_config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
156 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
157 limiter = log_config_get_boolean(both_config, "limiter", DEFAULT_CONFIG_LIMITER);
158 limiter_apply_to_all_buffers = log_config_get_int(both_config,
159 "limiter_apply_to_all_buffers",
160 DEFAULT_CONFIG_LIMITER_APPLY_TO_ALL_BUFFERS);
162 const char *stash_failed_log_method = log_config_get(both_config, "stash_failed_log_method");
163 if (stash_failed_log_method) {
165 if (strcmp(stash_failed_log_method, "critical") == 0)
166 stash_failed_log = stash_critical;
171 void __update_plog(const struct log_config *conf)
175 for (size_t i = 0; i < NELEMS(plog); ++i) {
176 char key[MAX_CONF_KEY_LEN];
177 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
180 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
185 * @brief Configure the library
186 * @details Reads relevant config values
187 * @remarks This is more or less a constructor, but there are some obstacles
188 * to using it as such (i.e. with attribute constructor):
190 * - some important pieces of the system link to dlog, they start very early
191 * such that dlog can't properly initialize (which lasts for program lifetime)
192 * but don't actually log anything until later on and would be fine under lazy
193 * initialisation. The way to do it "properly" would be to expose this function
194 * into the API so that people can manually call it when they're ready, but
195 * one of the design goals of the current API is that it requires absolutely no
196 * other calls than `dlog_print`. Changing it would require somebody with a
197 * bird's eye view of the system to produce a design so I wouldn't count on it.
199 * - the constructor would need to have as high of a priority as possible (so as
200 * to minimize the risk of another library's constructor using uninitialized data)
201 * but at the same time others might want some room to wrap functions before
202 * dlog uses them (think mprobe/mcheck). This would also require a design pass.
207 bool __configure(void)
209 __attribute__((cleanup(log_config_free))) struct log_config static_config = {};
210 __attribute__((cleanup(log_config_free))) struct log_config both_config = {};
212 if (log_config_read(&static_config) < 0)
214 log_config_copy(&both_config, &static_config);
216 dynamic_config = __dynamic_config_create(&both_config);
218 __configure_parameters(&static_config, &both_config);
220 if (!__configure_backend(&both_config)) {
221 __dynamic_config_destroy();
222 dynamic_config = false;
226 __configure_deduplicate(&both_config);
227 __configure_limiter(&static_config, &both_config);
231 static void __attribute__((constructor(101))) __install_pipe_handler(void)
233 /* We mask SIGPIPE signal because most applications do not install their
234 * own SIGPIPE handler. Default behaviour in SIGPIPE case is to abort the
235 * process. SIGPIPE occurs when e.g. dlog daemon closes read pipe endpoint.
237 * We do this in the library constructor (at maximum priority) and not
238 * during regular (lazy) initialisation so as to prevent overwriting the
239 * program's actual signal handler, if it has one.
241 * In theory this is not required for the Android logger backend; however,
242 * this early we don't yet know the backend and also it is good to behave
243 * consistently in this regard anyway.
245 * We don't revert this in a destructor because Unix signals are bonkers
246 * and we have no way to do this cleanly. Most libdlog users don't use
247 * runtime linking so this would mostly done at program exit either way. */
248 signal(SIGPIPE, SIG_IGN);
251 static void __attribute__((constructor(102))) __set_output_buffering(void)
253 /* If stdout and/or stderr is redirected to dlog (service, driver)
254 * it is best if we buffer lines, otherwise the following can happen:
255 * - no buffering: service/driver recives every single byte (precisely
256 * every single write*(2) call), causing it to either buffer the data
257 * anyway (service), or print logs at random places (driver)
258 * - full buffering: service/driver receives several hundred lines,
259 * which results in one giant entry being added (driver) or long delays
260 * before logs appear (service) */
261 if (getenv(DLOG_ENV_STDOUT_LINE_BUFFERED))
264 if (getenv(DLOG_ENV_STDERR_LINE_BUFFERED))
268 static bool first = true;
269 static bool initialize(void)
274 /* The mutex acts as a barrier, but otherwise the C language's
275 * machine abstraction is single-threaded. This means that the
276 * compiler is free to rearrange calls inside the mutex according
277 * to the as-if rule because it doesn't care if another thread can
278 * access it in parallel. In particular, `is_initialized = true`
279 * directly after `__configure()` could be rearranged to go in
280 * front of it because it is not touched inside that function
281 * if the compiler thinks it helps somehow (not unlikely: since
282 * it is checked before the mutex, it is very probable for it to
283 * still be in the CPU register or something like that). On top
284 * of that, some architectures (in particular, armv7l) don't have
285 * strict memory guarantees and can reorder actual memory stores
286 * on their own, even if the compiler didn't do anything fancy
287 * when creating machine code. For more info about the issue,
288 * see https://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
290 * Ultimately this means that there needs to be some sort of
291 * barrier between `__configure` and `is_initialized = true`,
292 * and the simplest way to achieve that is to just wait until
293 * the second entry into the mutex. */
296 pthread_mutex_lock(&log_construction_lock);
298 first = !__configure();
300 is_initialized = true;
302 pthread_mutex_unlock(&log_construction_lock);
307 * @brief Fatal assertion
308 * @details Conditionally crash the sucka who sent the log
309 * @param[in] prio Priority of the log
311 static void __dlog_fatal_assert(int prio)
313 assert(!fatal_assert || (prio != DLOG_FATAL));
317 * @brief Check log validity
318 * @details Checks whether the log is valid and eligible for printing
319 * @param[in] log_id The target buffer ID
320 * @param[in] prio The log's priority
321 * @param[in] tag The log's tag
322 * @return DLOG_ERROR_NONE on success, else an error code.
323 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
325 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
329 return DLOG_ERROR_INVALID_PARAMETER;
331 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
332 return DLOG_ERROR_INVALID_PARAMETER;
334 return DLOG_ERROR_NONE;
338 * @brief Check log against limiter rules
339 * @details Checks whether the log passes current limiter rules
340 * @param[in] log_id The target buffer ID
341 * @param[in] prio The log's priority
342 * @param[in] tag The log's tag
343 * @return DLOG_ERROR_NONE on success, else an error code.
344 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
346 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
348 if (!debugmode && prio <= DLOG_DEBUG)
349 return DLOG_ERROR_NOT_PERMITTED;
352 __dynamic_config_update();
355 struct pass_log_result should_log = { .decision = DECISION_DENIED };
356 if (!pthread_rwlock_rdlock(&log_limiter_lock)) {
357 should_log = __log_limiter_pass_log(tag, prio);
358 pthread_rwlock_unlock(&log_limiter_lock);
361 switch (should_log.decision) {
362 case DECISION_DENIED:
363 return DLOG_ERROR_NOT_PERMITTED;
365 case DECISION_TAG_LIMIT_EXCEEDED_MESSAGE:
366 case DECISION_PID_LIMIT_EXCEEDED_MESSAGE: {
368 int result = clock_gettime(CLOCK_MONOTONIC, &tp);
370 return DLOG_ERROR_NOT_PERMITTED;
372 snprintf(buf, sizeof(buf),
373 "Your log has been blocked due to per-%s limit of %d logs per %d seconds.",
374 should_log.decision == DECISION_TAG_LIMIT_EXCEEDED_MESSAGE ? "tag" : "PID",
375 should_log.logs_per_period, should_log.period_s);
376 write_to_log(log_id, prio, tag, buf, &tp);
377 return DLOG_ERROR_NOT_PERMITTED;
380 case DECISION_ALLOWED:
385 /* This can change due to __dynamic_config_update(), but is atomic and its
386 * value implies nothing else so does not need to be under a lock. */
388 return DLOG_ERROR_NOT_PERMITTED;
390 return DLOG_ERROR_NONE;
393 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)
395 if (check_should_log && prio < priority_filter_level)
396 return DLOG_ERROR_NONE;
398 if ((check_should_log || limiter_apply_to_all_buffers) && (dlog_check_limiter(log_id, prio, tag) < 0))
399 return DLOG_ERROR_NONE;
401 char buf[LOG_MAX_PAYLOAD_SIZE];
402 int len = vsnprintf(buf, sizeof buf, fmt, ap);
404 return DLOG_ERROR_NONE;
405 else if (len >= sizeof buf)
406 len = sizeof buf - 1;
410 if (deduplicate_func && !clock_gettime(CLOCK_MONOTONIC, &tp)) {
411 dlog_deduplicate_e ret = deduplicate_func(buf, len, &tp);
412 if (ret == DLOG_DEDUPLICATE)
413 return DLOG_ERROR_NONE;
414 else if (ret == DLOG_DO_NOT_DEDUPLICATE_BUT_WARN)
415 deduplicate_warn(buf, sizeof buf, len);
416 r = write_to_log(log_id, prio, tag, buf, &tp);
418 r = write_to_log(log_id, prio, tag, buf, NULL);
420 if (r < 0 && stash_failed_log)
421 r = stash_failed_log(log_id, prio, tag, buf);
426 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)
428 int ret = dlog_check_validity(log_id, prio, tag);
432 /* Threads can be cancelled before they give up a lock.
433 * Therefore cancellation is temporarily disabled.
434 * This solution is comparatively simple and cheap.
435 * The other solutions (cleanup handlers, robust mutexes)
436 * would be much more complicated and also inflict larger
437 * runtime costs. The downside of disabling cancellation
438 * is not a problem in our case because it is temporary
439 * and very brief so we don't keep an obsolete thread
440 * for much longer than we otherwise would. */
441 int old_cancel_state;
442 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancel_state);
444 /* The only thing that needs to be protected here is `write_to_log` since
445 * all other resources already have their own specific locks (and even the
446 * pointer could be made to point at a null handler instead of a true NULL)
447 * but giving this guarantee makes everything a lot simpler as it removes
448 * the risk of something suddenly becoming NULL during processing. */
449 if (!initialize() || !write_to_log)
450 // TODO: We could consider stashing the failed log here
451 ret = DLOG_ERROR_NOT_PERMITTED;
452 else if (secure_log && !enable_secure_logs)
455 ret = __write_to_log_critical_section(log_id, prio, tag, fmt, ap, check_should_log);
457 pthread_setcancelstate(old_cancel_state, NULL);
462 int __critical_log_append_timestamp(char *buf, size_t buflen)
464 /* NB: the timestamp may slightly differ from the one that gets
465 * added onto the copy that goes into the regular buffer, and
466 * timestamp acquisition is duplicated. This would ideally be
467 * solved, but timestamps are currently added fairly deep in
468 * backend-specific functions so for now this will have to do.
469 * Also, since we're the sender, there is just this one set of
470 * timestamps, i.e. the send timestamp! The usual alternative
471 * set of receive timestamps will never have the opportunity
472 * to get added to the entry since this log is supposed to end
473 * up straight in the file (there's potentially the trusted
474 * writer binary but we're trying to keep the set of actions
475 * it needs to do to the minimum and those timestamps would
476 * in practice be the same anyway). */
479 clock_gettime(CLOCK_REALTIME, &ts);
480 const time_t tt = ts.tv_sec;
481 const long int real_millisec = ts.tv_nsec / 1000000;
482 clock_gettime(CLOCK_MONOTONIC, &ts);
484 struct tm *const ptm = localtime_r(&tt, &tmBuf);
485 assert(ptm); // we're in a short lived fork so asserts are fine and make things simple
487 int len = strftime(buf, buflen, "%m-%d %H:%M:%S", ptm);
490 int tmp_len = snprintf(buf + len, buflen - len, ".%03ld", real_millisec);
492 assert(tmp_len < buflen - len);
495 tmp_len = strftime(buf + len, buflen - len, "%z ", ptm);
496 assert(tmp_len != 0);
499 tmp_len = snprintf(buf + len, buflen - len, "%5lu.%03ld", ts.tv_sec, ts.tv_nsec / 1000000);
501 assert(tmp_len < buflen - len);
507 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)
509 int len = __critical_log_append_timestamp(buf, buflen);
510 const int metadata_len = snprintf(buf + len, buflen - len, " P%5d T%5d B%-6s %c/%-8s: ",
513 log_name_by_id(log_id),
514 filter_pri_to_char(prio),
515 tag ?: "CRITICAL_NO_TAG");
516 assert(metadata_len > 0);
517 if (metadata_len >= buflen - len)
518 return buflen - 1; // can genuinely happen with an exceedingly large tag
521 const int content_len = vsnprintf(buf + len, buflen - len, fmt, ap);
522 assert(content_len >= 0); // 0 is legit with format == ""
523 if (content_len >= buflen - len)
531 __attribute__ ((noreturn))
533 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)
535 char buf[LOG_MAX_PAYLOAD_SIZE + 128]; // extra space for some metadata
536 const int len = __critical_log_build_msg(buf, sizeof buf - 1, main_pid, main_tid, log_id, prio, tag, fmt, ap);
540 static const char *const path = "/usr/libexec/dlog-log-critical";
541 execl(path, path /* argv[0] convention */, buf, (char *) NULL);
544 /* Compilers are sometimes smart enough to recognize _exit's
545 * noreturn attribute, even if we wrap it with something that
546 * returns. This causes it to behave in unexpected ways, for
547 * example it can blow up the program regardless or it can
548 * optimize some conditionals out (and incorrectly enter them
549 * after the exit call fails to actually exit). This makes it
550 * unsuitable for tests. */
552 _exit(1); // not the regular `exit` so as not to trigger any `atexit` handlers prematurely
556 #ifndef UNIT_TEST // contains forks and exits, these don't work well with wrapping (see above)
557 void __critical_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
559 /* Critical log functionality is mostly done in a separate binary
560 * to handle security correctly (else every process would have to
561 * possess the necessary privilege to write onto that file, which
562 * would be opening a fairly nasty can of worms from the security
563 * point of view). Our use of exec() is why a simple thread would
564 * not suffice and we're resorting to a fork.
566 * The double fork, much like a double barreled 12 gauge shotgun,
567 * is an elegant solution designed to stop a zombie army. We'd be
568 * creating zombie processes if we didn't wait() for the children
569 * we spawn, but we don't really want to do that since it results
570 * in a needless delay. Instead, the writer process is actually a
571 * grandchild, with our direct child exiting immediately just for
572 * us to have something to wait on that is guaranteed not to take
573 * too long. The orphaned grandchild is adopted by init, who will
574 * take care to reap it when it dies. In addition to avoiding the
575 * delay, the client will not have any unexpected children (which
576 * could ruin logic in its own waits).
579 * ┌───────┐ ┌─────────┐ ┌─────────────┐ ┌────────┐
580 * │ pid 1 ├──>│ libdlog ├──>│ immediately ├──>│ execs │
581 * │ init │ │ client │ │ exits │ │ writer │
582 * └───────┘ └─────────┘ └─────────────┘ └────────┘
584 * Afterwards, libdlog has no children:
585 * ┌───────┐ ┌─────────┐ ┌────────┐
586 * │ pid 1 ├──>│ libdlog │ ┌─────────>│ writer │
587 * │ init ├─┐ │ client │ │ │ binary │
588 * └───────┘ │ └─────────┘ │ └────────┘
589 * └──────────────────────┘
594 if (!enable_critical)
597 const pid_t main_pid = getpid();
598 const pid_t main_tid = gettid();
600 const int temporary_exiter_pid = fork();
601 if (temporary_exiter_pid < 0)
603 if (temporary_exiter_pid != 0) {
604 waitpid(temporary_exiter_pid, NULL, 0);
608 const int child_pid = fork();
614 __critical_log_child(main_pid, main_tid, log_id, prio, tag, fmt, ap);
617 static void stash_critical_inner(log_id_t log_id, log_priority prio, const char *tag, const char *fmt, ...)
622 __critical_log(log_id, prio, tag, fmt, ap);
626 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg)
628 stash_critical_inner(log_id, prio, tag, "FAILED TO LOG: %s", msg);
632 EXPORT_API int __dlog_critical_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
637 __critical_log(log_id, prio, tag, fmt, ap);
641 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
648 EXPORT_API int dlog_set_minimum_priority(int priority)
650 if (priority < DLOG_DEFAULT || priority > DLOG_PRIO_MAX)
651 return DLOG_ERROR_INVALID_PARAMETER;
653 priority_filter_level = priority;
654 return DLOG_ERROR_NONE;
659 * @details Print a log line
660 * @param[in] log_id The target buffer ID
661 * @param[in] prio Priority
663 * @param[in] fmt Format (same as printf)
664 * @param[in] ap Argument list
665 * @return Bytes written, or negative error
667 EXPORT_API int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
669 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, false);
670 __dlog_fatal_assert(prio);
677 * @details Print a log line
678 * @param[in] log_id The target buffer ID
679 * @param[in] prio Priority
681 * @param[in] fmt Format (same as printf)
682 * @return Bytes written, or negative error
684 EXPORT_API int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
689 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
697 * @details Print a log line
698 * @param[in] log_id The target buffer ID
699 * @param[in] prio Priority
701 * @param[in] fmt Format (same as printf)
702 * @return Bytes written, or negative error
704 EXPORT_API int __dlog_sec_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
706 if (!enable_secure_logs)
712 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, true);
713 __dlog_fatal_assert(prio);
719 EXPORT_API int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
721 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false, false);
724 EXPORT_API int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
729 int ret = dlog_vprint(prio, tag, fmt, ap);
736 * @brief Finalize DLog
737 * @details Finalizes and deallocates the library
738 * @notes Used directly in tests; brings back the pre-init state
740 void __dlog_fini(void)
742 if (destroy_backend) {
744 destroy_backend = NULL;
747 is_initialized = false;
750 enable_secure_logs = true;
751 enable_critical = false;
752 __deduplicate_destroy();
753 __log_limiter_destroy();
755 __dynamic_config_destroy();