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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 const char *stash_failed_log_method = log_config_get(both_config, "stash_failed_log_method");
167 if (stash_failed_log_method) {
169 if (strcmp(stash_failed_log_method, "critical") == 0)
170 stash_failed_log = stash_critical;
175 void __update_plog(const struct log_config *conf)
179 for (size_t i = 0; i < NELEMS(plog); ++i) {
180 char key[MAX_CONF_KEY_LEN];
181 const int r = snprintf(key, sizeof key, "enable_%s", log_name_by_id((log_id_t)i));
184 plog[i] = log_config_get_boolean(conf, key, plog_default_values[i]);
189 * @brief Configure the library
190 * @details Reads relevant config values
191 * @remarks This is more or less a constructor, but there are some obstacles
192 * to using it as such (i.e. with attribute constructor):
194 * - some important pieces of the system link to dlog, they start very early
195 * such that dlog can't properly initialize (which lasts for program lifetime)
196 * but don't actually log anything until later on and would be fine under lazy
197 * initialisation. The way to do it "properly" would be to expose this function
198 * into the API so that people can manually call it when they're ready, but
199 * one of the design goals of the current API is that it requires absolutely no
200 * other calls than `dlog_print`. Changing it would require somebody with a
201 * bird's eye view of the system to produce a design so I wouldn't count on it.
203 * - the constructor would need to have as high of a priority as possible (so as
204 * to minimize the risk of another library's constructor using uninitialized data)
205 * but at the same time others might want some room to wrap functions before
206 * dlog uses them (think mprobe/mcheck). This would also require a design pass.
211 bool __configure(void)
213 __attribute__((cleanup(log_config_free))) struct log_config static_config = {};
214 __attribute__((cleanup(log_config_free))) struct log_config both_config = {};
216 if (log_config_read(&static_config) < 0)
218 log_config_copy(&both_config, &static_config);
220 dynamic_config = __dynamic_config_create(&both_config);
222 __configure_parameters(&static_config, &both_config);
224 if (!__configure_backend(&both_config)) {
225 __dynamic_config_destroy();
226 dynamic_config = false;
230 __configure_deduplicate(&both_config);
231 __configure_limiter(&static_config, &both_config);
235 static void __attribute__((constructor(101))) __install_pipe_handler(void)
237 /* We mask SIGPIPE signal because most applications do not install their
238 * own SIGPIPE handler. Default behaviour in SIGPIPE case is to abort the
239 * process. SIGPIPE occurs when e.g. dlog daemon closes read pipe endpoint.
241 * We do this in the library constructor (at maximum priority) and not
242 * during regular (lazy) initialisation so as to prevent overwriting the
243 * program's actual signal handler, if it has one.
245 * In theory this is not required for the Android logger backend; however,
246 * this early we don't yet know the backend and also it is good to behave
247 * consistently in this regard anyway.
249 * We don't revert this in a destructor because Unix signals are bonkers
250 * and we have no way to do this cleanly. Most libdlog users don't use
251 * runtime linking so this would mostly done at program exit either way. */
252 signal(SIGPIPE, SIG_IGN);
255 static void __attribute__((constructor(102))) __set_output_buffering(void)
257 /* If stdout and/or stderr is redirected to dlog (service, driver)
258 * it is best if we buffer lines, otherwise the following can happen:
259 * - no buffering: service/driver recives every single byte (precisely
260 * every single write*(2) call), causing it to either buffer the data
261 * anyway (service), or print logs at random places (driver)
262 * - full buffering: service/driver receives several hundred lines,
263 * which results in one giant entry being added (driver) or long delays
264 * before logs appear (service) */
265 if (getenv(DLOG_ENV_STDOUT_LINE_BUFFERED))
268 if (getenv(DLOG_ENV_STDERR_LINE_BUFFERED))
272 static bool first = true;
273 static bool initialize(void)
278 /* The mutex acts as a barrier, but otherwise the C language's
279 * machine abstraction is single-threaded. This means that the
280 * compiler is free to rearrange calls inside the mutex according
281 * to the as-if rule because it doesn't care if another thread can
282 * access it in parallel. In particular, `is_initialized = true`
283 * directly after `__configure()` could be rearranged to go in
284 * front of it because it is not touched inside that function
285 * if the compiler thinks it helps somehow (not unlikely: since
286 * it is checked before the mutex, it is very probable for it to
287 * still be in the CPU register or something like that). On top
288 * of that, some architectures (in particular, armv7l) don't have
289 * strict memory guarantees and can reorder actual memory stores
290 * on their own, even if the compiler didn't do anything fancy
291 * when creating machine code. For more info about the issue,
292 * see https://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
294 * Ultimately this means that there needs to be some sort of
295 * barrier between `__configure` and `is_initialized = true`,
296 * and the simplest way to achieve that is to just wait until
297 * the second entry into the mutex. */
300 pthread_mutex_lock(&log_construction_lock);
302 first = !__configure();
304 is_initialized = true;
306 pthread_mutex_unlock(&log_construction_lock);
311 * @brief Fatal assertion
312 * @details Conditionally crash the sucka who sent the log
313 * @param[in] prio Priority of the log
315 static void __dlog_fatal_assert(int prio)
317 assert(!fatal_assert || (prio != DLOG_FATAL));
321 * @brief Check log validity
322 * @details Checks whether the log is valid and eligible for printing
323 * @param[in] log_id The target buffer ID
324 * @param[in] prio The log's priority
325 * @param[in] tag The log's tag
326 * @return DLOG_ERROR_NONE on success, else an error code.
327 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
329 static int dlog_check_validity(log_id_t log_id, int prio, const char *tag)
333 return DLOG_ERROR_INVALID_PARAMETER;
335 if (log_id <= LOG_ID_INVALID || LOG_ID_MAX <= log_id)
336 return DLOG_ERROR_INVALID_PARAMETER;
338 return DLOG_ERROR_NONE;
342 * @brief Check log against limiter rules
343 * @details Checks whether the log passes current limiter rules
344 * @param[in] log_id The target buffer ID
345 * @param[in] prio The log's priority
346 * @param[in] tag The log's tag
347 * @return DLOG_ERROR_NONE on success, else an error code.
348 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
350 static int dlog_check_limiter(log_id_t log_id, int prio, const char *tag)
352 if (!debugmode && prio <= DLOG_DEBUG)
353 return DLOG_ERROR_NOT_PERMITTED;
356 __dynamic_config_update(limiter_data);
359 struct pass_log_result should_log = { .decision = DECISION_DENIED };
360 if (!pthread_rwlock_rdlock(&log_limiter_lock)) {
361 should_log = __log_limiter_pass_log(limiter_data, tag, prio);
362 pthread_rwlock_unlock(&log_limiter_lock);
365 switch (should_log.decision) {
366 case DECISION_DENIED:
367 return DLOG_ERROR_NOT_PERMITTED;
369 case DECISION_TAG_LIMIT_EXCEEDED_MESSAGE:
370 case DECISION_PID_LIMIT_EXCEEDED_MESSAGE: {
372 int result = clock_gettime(CLOCK_MONOTONIC, &tp);
374 return DLOG_ERROR_NOT_PERMITTED;
376 snprintf(buf, sizeof(buf),
377 "Your log has been blocked due to per-%s limit of %d logs per %d seconds.",
378 should_log.decision == DECISION_TAG_LIMIT_EXCEEDED_MESSAGE ? "tag" : "PID",
379 should_log.logs_per_period, should_log.period_s);
380 write_to_log(log_id, prio, tag, buf, &tp);
381 return DLOG_ERROR_NOT_PERMITTED;
384 case DECISION_ALLOWED:
389 /* This can change due to __dynamic_config_update(), but is atomic and its
390 * value implies nothing else so does not need to be under a lock. */
392 return DLOG_ERROR_NOT_PERMITTED;
394 return DLOG_ERROR_NONE;
397 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)
399 if (check_should_log && prio < priority_filter_level)
400 return DLOG_ERROR_NONE;
402 if ((check_should_log || limiter_apply_to_all_buffers) && (dlog_check_limiter(log_id, prio, tag) < 0))
403 return DLOG_ERROR_NONE;
405 char buf[LOG_MAX_PAYLOAD_SIZE];
406 int len = vsnprintf(buf, sizeof buf, fmt, ap);
408 return DLOG_ERROR_NONE;
409 else if (len >= sizeof buf)
410 len = sizeof buf - 1;
412 // Temporary workaround, see temporary.c
413 prepend_container_tag_if_in_container(sizeof buf, buf, &len);
417 if (deduplicate_func && !clock_gettime(CLOCK_MONOTONIC, &tp)) {
418 dlog_deduplicate_e ret = deduplicate_func(buf, len, &tp);
419 if (ret == DLOG_DEDUPLICATE)
420 return DLOG_ERROR_NONE;
421 else if (ret == DLOG_DO_NOT_DEDUPLICATE_BUT_WARN)
422 deduplicate_warn(buf, sizeof buf, len);
423 r = write_to_log(log_id, prio, tag, buf, &tp);
425 r = write_to_log(log_id, prio, tag, buf, NULL);
427 if (r < 0 && stash_failed_log)
428 r = stash_failed_log(log_id, prio, tag, buf);
433 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)
435 int ret = dlog_check_validity(log_id, prio, tag);
439 /* Threads can be cancelled before they give up a lock.
440 * Therefore cancellation is temporarily disabled.
441 * This solution is comparatively simple and cheap.
442 * The other solutions (cleanup handlers, robust mutexes)
443 * would be much more complicated and also inflict larger
444 * runtime costs. The downside of disabling cancellation
445 * is not a problem in our case because it is temporary
446 * and very brief so we don't keep an obsolete thread
447 * for much longer than we otherwise would. */
448 int old_cancel_state;
449 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancel_state);
451 /* The only thing that needs to be protected here is `write_to_log` since
452 * all other resources already have their own specific locks (and even the
453 * pointer could be made to point at a null handler instead of a true NULL)
454 * but giving this guarantee makes everything a lot simpler as it removes
455 * the risk of something suddenly becoming NULL during processing. */
456 if (!initialize() || !write_to_log)
457 // TODO: We could consider stashing the failed log here
458 ret = DLOG_ERROR_NOT_PERMITTED;
459 else if (secure_log && !enable_secure_logs)
462 ret = __write_to_log_critical_section(log_id, prio, tag, fmt, ap, check_should_log);
464 pthread_setcancelstate(old_cancel_state, NULL);
469 int __critical_log_append_timestamp(char *buf, size_t buflen)
471 /* NB: the timestamp may slightly differ from the one that gets
472 * added onto the copy that goes into the regular buffer, and
473 * timestamp acquisition is duplicated. This would ideally be
474 * solved, but timestamps are currently added fairly deep in
475 * backend-specific functions so for now this will have to do.
476 * Also, since we're the sender, there is just this one set of
477 * timestamps, i.e. the send timestamp! The usual alternative
478 * set of receive timestamps will never have the opportunity
479 * to get added to the entry since this log is supposed to end
480 * up straight in the file (there's potentially the trusted
481 * writer binary but we're trying to keep the set of actions
482 * it needs to do to the minimum and those timestamps would
483 * in practice be the same anyway). */
486 clock_gettime(CLOCK_REALTIME, &ts);
487 const time_t tt = ts.tv_sec;
488 const long int real_millisec = ts.tv_nsec / 1000000;
489 clock_gettime(CLOCK_MONOTONIC, &ts);
491 struct tm *const ptm = localtime_r(&tt, &tmBuf);
492 assert(ptm); // we're in a short lived fork so asserts are fine and make things simple
494 int len = strftime(buf, buflen, "%m-%d %H:%M:%S", ptm);
497 int tmp_len = snprintf(buf + len, buflen - len, ".%03ld", real_millisec);
499 assert(tmp_len < buflen - len);
502 tmp_len = strftime(buf + len, buflen - len, "%z ", ptm);
503 assert(tmp_len != 0);
506 tmp_len = snprintf(buf + len, buflen - len, "%5lu.%03ld", ts.tv_sec, ts.tv_nsec / 1000000);
508 assert(tmp_len < buflen - len);
514 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)
516 int len = __critical_log_append_timestamp(buf, buflen);
517 const int metadata_len = snprintf(buf + len, buflen - len, " P%5d T%5d B%-6s %c/%-8s: ",
520 log_name_by_id(log_id),
521 filter_pri_to_char(prio),
522 tag ?: "CRITICAL_NO_TAG");
523 assert(metadata_len > 0);
524 if (metadata_len >= buflen - len)
525 return buflen - 1; // can genuinely happen with an exceedingly large tag
528 const int content_len = vsnprintf(buf + len, buflen - len, fmt, ap);
529 assert(content_len >= 0); // 0 is legit with format == ""
530 if (content_len >= buflen - len)
538 __attribute__ ((noreturn))
540 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)
542 char buf[LOG_MAX_PAYLOAD_SIZE + 128]; // extra space for some metadata
543 const int len = __critical_log_build_msg(buf, sizeof buf - 1, main_pid, main_tid, log_id, prio, tag, fmt, ap);
547 static const char *const path = "/usr/libexec/dlog-log-critical";
548 execl(path, path /* argv[0] convention */, buf, (char *) NULL);
551 /* Compilers are sometimes smart enough to recognize _exit's
552 * noreturn attribute, even if we wrap it with something that
553 * returns. This causes it to behave in unexpected ways, for
554 * example it can blow up the program regardless or it can
555 * optimize some conditionals out (and incorrectly enter them
556 * after the exit call fails to actually exit). This makes it
557 * unsuitable for tests. */
559 _exit(1); // not the regular `exit` so as not to trigger any `atexit` handlers prematurely
563 #ifndef UNIT_TEST // contains forks and exits, these don't work well with wrapping (see above)
564 void __critical_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
566 /* Critical log functionality is mostly done in a separate binary
567 * to handle security correctly (else every process would have to
568 * possess the necessary privilege to write onto that file, which
569 * would be opening a fairly nasty can of worms from the security
570 * point of view). Our use of exec() is why a simple thread would
571 * not suffice and we're resorting to a fork.
573 * The double fork, much like a double barreled 12 gauge shotgun,
574 * is an elegant solution designed to stop a zombie army. We'd be
575 * creating zombie processes if we didn't wait() for the children
576 * we spawn, but we don't really want to do that since it results
577 * in a needless delay. Instead, the writer process is actually a
578 * grandchild, with our direct child exiting immediately just for
579 * us to have something to wait on that is guaranteed not to take
580 * too long. The orphaned grandchild is adopted by init, who will
581 * take care to reap it when it dies. In addition to avoiding the
582 * delay, the client will not have any unexpected children (which
583 * could ruin logic in its own waits).
586 * ┌───────┐ ┌─────────┐ ┌─────────────┐ ┌────────┐
587 * │ pid 1 ├──>│ libdlog ├──>│ immediately ├──>│ execs │
588 * │ init │ │ client │ │ exits │ │ writer │
589 * └───────┘ └─────────┘ └─────────────┘ └────────┘
591 * Afterwards, libdlog has no children:
592 * ┌───────┐ ┌─────────┐ ┌────────┐
593 * │ pid 1 ├──>│ libdlog │ ┌─────────>│ writer │
594 * │ init ├─┐ │ client │ │ │ binary │
595 * └───────┘ │ └─────────┘ │ └────────┘
596 * └──────────────────────┘
601 if (!enable_critical)
604 const pid_t main_pid = getpid();
605 const pid_t main_tid = gettid();
607 const int temporary_exiter_pid = fork();
608 if (temporary_exiter_pid < 0)
610 if (temporary_exiter_pid != 0) {
611 waitpid(temporary_exiter_pid, NULL, 0);
615 const int child_pid = fork();
621 __critical_log_child(main_pid, main_tid, log_id, prio, tag, fmt, ap);
624 static void stash_critical_inner(log_id_t log_id, log_priority prio, const char *tag, const char *fmt, ...)
629 __critical_log(log_id, prio, tag, fmt, ap);
633 static int stash_critical(log_id_t log_id, log_priority prio, const char *tag, const char *msg)
635 stash_critical_inner(log_id, prio, tag, "FAILED TO LOG: %s", msg);
639 EXPORT_API int __dlog_critical_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
644 __critical_log(log_id, prio, tag, fmt, ap);
648 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
655 EXPORT_API int dlog_set_minimum_priority(int priority)
657 if (priority < DLOG_DEFAULT || priority > DLOG_PRIO_MAX)
658 return DLOG_ERROR_INVALID_PARAMETER;
660 priority_filter_level = priority;
661 return DLOG_ERROR_NONE;
666 * @details Print a log line
667 * @param[in] log_id The target buffer ID
668 * @param[in] prio Priority
670 * @param[in] fmt Format (same as printf)
671 * @param[in] ap Argument list
672 * @return Bytes written, or negative error
674 EXPORT_API int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
676 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, false);
677 __dlog_fatal_assert(prio);
684 * @details Print a log line
685 * @param[in] log_id The target buffer ID
686 * @param[in] prio Priority
688 * @param[in] fmt Format (same as printf)
689 * @return Bytes written, or negative error
691 EXPORT_API int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
696 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
704 * @details Print a log line
705 * @param[in] log_id The target buffer ID
706 * @param[in] prio Priority
708 * @param[in] fmt Format (same as printf)
709 * @return Bytes written, or negative error
711 EXPORT_API int __dlog_sec_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
713 if (!enable_secure_logs)
719 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true, true);
720 __dlog_fatal_assert(prio);
726 EXPORT_API int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
728 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false, false);
731 EXPORT_API int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
736 int ret = dlog_vprint(prio, tag, fmt, ap);
743 * @brief Finalize DLog
744 * @details Finalizes and deallocates the library
745 * @notes Used directly in tests; brings back the pre-init state
747 void __dlog_fini(void)
749 if (destroy_backend) {
751 destroy_backend = NULL;
754 is_initialized = false;
757 enable_secure_logs = true;
758 enable_critical = false;
759 __deduplicate_destroy();
760 __log_limiter_destroy(limiter_data);
762 __dynamic_config_destroy();