/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include #include #include #include #include #include "macro.h" #include "ratelimit.h" /* Some structures we reference but don't want to pull in headers for */ struct iovec; struct signalfd_siginfo; typedef enum LogTarget{ LOG_TARGET_CONSOLE, LOG_TARGET_CONSOLE_PREFIXED, LOG_TARGET_KMSG, LOG_TARGET_JOURNAL, LOG_TARGET_JOURNAL_OR_KMSG, LOG_TARGET_SYSLOG, LOG_TARGET_SYSLOG_OR_KMSG, LOG_TARGET_AUTO, /* console if stderr is not journal, JOURNAL_OR_KMSG otherwise */ LOG_TARGET_NULL, _LOG_TARGET_MAX, _LOG_TARGET_INVALID = -EINVAL, } LogTarget; /* This log level disables logging completely. It can only be passed to log_set_max_level() and cannot be * used a regular log level. */ #define LOG_NULL (LOG_EMERG - 1) /* Note to readers: << and >> have lower precedence (are evaluated earlier) than & and | */ #define SYNTHETIC_ERRNO(num) (1 << 30 | (num)) #define IS_SYNTHETIC_ERRNO(val) ((val) >> 30 & 1) #define ERRNO_VALUE(val) (abs(val) & ~(1 << 30)) /* The callback function to be invoked when syntax warnings are seen * in the unit files. */ typedef void (*log_syntax_callback_t)(const char *unit, int level, void *userdata); void set_log_syntax_callback(log_syntax_callback_t cb, void *userdata); static inline void clear_log_syntax_callback(dummy_t *dummy) { set_log_syntax_callback(/* cb= */ NULL, /* userdata= */ NULL); } const char *log_target_to_string(LogTarget target) _const_; LogTarget log_target_from_string(const char *s) _pure_; void log_set_target(LogTarget target); int log_set_target_from_string(const char *e); LogTarget log_get_target(void) _pure_; void log_settle_target(void); void log_set_max_level(int level); int log_set_max_level_from_string(const char *e); int log_get_max_level(void) _pure_; void log_set_facility(int facility); void log_show_color(bool b); bool log_get_show_color(void) _pure_; void log_show_location(bool b); bool log_get_show_location(void) _pure_; void log_show_time(bool b); bool log_get_show_time(void) _pure_; void log_show_tid(bool b); bool log_get_show_tid(void) _pure_; int log_show_color_from_string(const char *e); int log_show_location_from_string(const char *e); int log_show_time_from_string(const char *e); int log_show_tid_from_string(const char *e); /* Functions below that open and close logs or configure logging based on the * environment should not be called from library code — this is always a job * for the application itself. */ assert_cc(STRLEN(__FILE__) > STRLEN(RELATIVE_SOURCE_PATH) + 1); #define PROJECT_FILE (&__FILE__[STRLEN(RELATIVE_SOURCE_PATH) + 1]) int log_open(void); void log_close(void); void log_forget_fds(void); void log_parse_environment_variables(void); void log_parse_environment(void); int log_dispatch_internal( int level, int error, const char *file, int line, const char *func, const char *object_field, const char *object, const char *extra, const char *extra_field, char *buffer); int log_internal( int level, int error, const char *file, int line, const char *func, const char *format, ...) _printf_(6,7); int log_internalv( int level, int error, const char *file, int line, const char *func, const char *format, va_list ap) _printf_(6,0); int log_object_internalv( int level, int error, const char *file, int line, const char *func, const char *object_field, const char *object, const char *extra_field, const char *extra, const char *format, va_list ap) _printf_(10,0); int log_object_internal( int level, int error, const char *file, int line, const char *func, const char *object_field, const char *object, const char *extra_field, const char *extra, const char *format, ...) _printf_(10,11); int log_struct_internal( int level, int error, const char *file, int line, const char *func, const char *format, ...) _printf_(6,0) _sentinel_; int log_oom_internal( int level, const char *file, int line, const char *func); int log_format_iovec( struct iovec *iovec, size_t iovec_len, size_t *n, bool newline_separator, int error, const char *format, va_list ap) _printf_(6, 0); int log_struct_iovec_internal( int level, int error, const char *file, int line, const char *func, const struct iovec *input_iovec, size_t n_input_iovec); /* This modifies the buffer passed! */ int log_dump_internal( int level, int error, const char *file, int line, const char *func, char *buffer); /* Logging for various assertions */ _noreturn_ void log_assert_failed( const char *text, const char *file, int line, const char *func); _noreturn_ void log_assert_failed_unreachable( const char *file, int line, const char *func); void log_assert_failed_return( const char *text, const char *file, int line, const char *func); #define log_dispatch(level, error, buffer) \ log_dispatch_internal(level, error, PROJECT_FILE, __LINE__, __func__, NULL, NULL, NULL, NULL, buffer) /* Logging with level */ #define log_full_errno_zerook(level, error, ...) \ ({ \ int _level = (level), _e = (error); \ _e = (log_get_max_level() >= LOG_PRI(_level)) \ ? log_internal(_level, _e, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \ : -ERRNO_VALUE(_e); \ _e < 0 ? _e : -ESTRPIPE; \ }) #if BUILD_MODE_DEVELOPER && !defined(TEST_CODE) # define ASSERT_NON_ZERO(x) assert((x) != 0) #else # define ASSERT_NON_ZERO(x) #endif #define log_full_errno(level, error, ...) \ ({ \ int _error = (error); \ ASSERT_NON_ZERO(_error); \ log_full_errno_zerook(level, _error, __VA_ARGS__); \ }) #define log_full(level, fmt, ...) \ ({ \ if (BUILD_MODE_DEVELOPER) \ assert(!strstr(fmt, "%m")); \ (void) log_full_errno_zerook(level, 0, fmt, ##__VA_ARGS__); \ }) int log_emergency_level(void); /* Normal logging */ #define log_debug(...) log_full(LOG_DEBUG, __VA_ARGS__) #define log_info(...) log_full(LOG_INFO, __VA_ARGS__) #define log_notice(...) log_full(LOG_NOTICE, __VA_ARGS__) #define log_warning(...) log_full(LOG_WARNING, __VA_ARGS__) #define log_error(...) log_full(LOG_ERR, __VA_ARGS__) #define log_emergency(...) log_full(log_emergency_level(), __VA_ARGS__) /* Logging triggered by an errno-like error */ #define log_debug_errno(error, ...) log_full_errno(LOG_DEBUG, error, __VA_ARGS__) #define log_info_errno(error, ...) log_full_errno(LOG_INFO, error, __VA_ARGS__) #define log_notice_errno(error, ...) log_full_errno(LOG_NOTICE, error, __VA_ARGS__) #define log_warning_errno(error, ...) log_full_errno(LOG_WARNING, error, __VA_ARGS__) #define log_error_errno(error, ...) log_full_errno(LOG_ERR, error, __VA_ARGS__) #define log_emergency_errno(error, ...) log_full_errno(log_emergency_level(), error, __VA_ARGS__) /* This logs at the specified level the first time it is called, and then * logs at debug. If the specified level is debug, this logs only the first * time it is called. */ #define log_once(level, ...) \ ({ \ if (ONCE) \ log_full(level, __VA_ARGS__); \ else if (LOG_PRI(level) != LOG_DEBUG) \ log_debug(__VA_ARGS__); \ }) #define log_once_errno(level, error, ...) \ ({ \ int _err = (error); \ if (ONCE) \ _err = log_full_errno(level, _err, __VA_ARGS__); \ else if (LOG_PRI(level) != LOG_DEBUG) \ _err = log_debug_errno(_err, __VA_ARGS__); \ else \ _err = -ERRNO_VALUE(_err); \ _err; \ }) #if LOG_TRACE # define log_trace(...) log_debug(__VA_ARGS__) # define log_trace_errno(...) log_debug_errno(__VA_ARGS__) #else # define log_trace(...) do {} while (0) # define log_trace_errno(e, ...) (-ERRNO_VALUE(e)) #endif /* Structured logging */ #define log_struct_errno(level, error, ...) \ log_struct_internal(level, error, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__, NULL) #define log_struct(level, ...) log_struct_errno(level, 0, __VA_ARGS__) #define log_struct_iovec_errno(level, error, iovec, n_iovec) \ log_struct_iovec_internal(level, error, PROJECT_FILE, __LINE__, __func__, iovec, n_iovec) #define log_struct_iovec(level, iovec, n_iovec) log_struct_iovec_errno(level, 0, iovec, n_iovec) /* This modifies the buffer passed! */ #define log_dump(level, buffer) \ log_dump_internal(level, 0, PROJECT_FILE, __LINE__, __func__, buffer) #define log_oom() log_oom_internal(LOG_ERR, PROJECT_FILE, __LINE__, __func__) #define log_oom_debug() log_oom_internal(LOG_DEBUG, PROJECT_FILE, __LINE__, __func__) bool log_on_console(void) _pure_; /* Helper to wrap the main message in structured logging. The macro doesn't do much, * except to provide visual grouping of the format string and its arguments. */ #if LOG_MESSAGE_VERIFICATION || defined(__COVERITY__) /* Do a fake formatting of the message string to let the scanner verify the arguments against the format * message. The variable will never be set to true, but we don't tell the compiler that :) */ extern bool _log_message_dummy; # define LOG_MESSAGE(fmt, ...) "MESSAGE=%.0d" fmt, (_log_message_dummy && printf(fmt, ##__VA_ARGS__)), ##__VA_ARGS__ #else # define LOG_MESSAGE(fmt, ...) "MESSAGE=" fmt, ##__VA_ARGS__ #endif void log_received_signal(int level, const struct signalfd_siginfo *si); /* If turned on, any requests for a log target involving "syslog" will be implicitly upgraded to the equivalent journal target */ void log_set_upgrade_syslog_to_journal(bool b); /* If turned on, and log_open() is called, we'll not use STDERR_FILENO for logging ever, but rather open /dev/console */ void log_set_always_reopen_console(bool b); /* If turned on, we'll open the log stream implicitly if needed on each individual log call. This is normally not * desired as we want to reuse our logging streams. It is useful however */ void log_set_open_when_needed(bool b); /* If turned on, then we'll never use IPC-based logging, i.e. never log to syslog or the journal. We'll only log to * stderr, the console or kmsg */ void log_set_prohibit_ipc(bool b); int log_dup_console(void); int log_syntax_internal( const char *unit, int level, const char *config_file, unsigned config_line, int error, const char *file, int line, const char *func, const char *format, ...) _printf_(9, 10); int log_syntax_invalid_utf8_internal( const char *unit, int level, const char *config_file, unsigned config_line, const char *file, int line, const char *func, const char *rvalue); #define log_syntax(unit, level, config_file, config_line, error, ...) \ ({ \ int _level = (level), _e = (error); \ (log_get_max_level() >= LOG_PRI(_level)) \ ? log_syntax_internal(unit, _level, config_file, config_line, _e, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \ : -ERRNO_VALUE(_e); \ }) #define log_syntax_invalid_utf8(unit, level, config_file, config_line, rvalue) \ ({ \ int _level = (level); \ (log_get_max_level() >= LOG_PRI(_level)) \ ? log_syntax_invalid_utf8_internal(unit, _level, config_file, config_line, PROJECT_FILE, __LINE__, __func__, rvalue) \ : -EINVAL; \ }) #define DEBUG_LOGGING _unlikely_(log_get_max_level() >= LOG_DEBUG) void log_setup(void); typedef struct LogRateLimit { int error; int level; RateLimit ratelimit; } LogRateLimit; #define log_ratelimit_internal(_level, _error, _format, _file, _line, _func, ...) \ ({ \ int _log_ratelimit_error = (_error); \ int _log_ratelimit_level = (_level); \ static LogRateLimit _log_ratelimit = { \ .ratelimit = { \ .interval = 1 * USEC_PER_SEC, \ .burst = 1, \ }, \ }; \ unsigned _num_dropped_errors = ratelimit_num_dropped(&_log_ratelimit.ratelimit); \ if (_log_ratelimit_error != _log_ratelimit.error || _log_ratelimit_level != _log_ratelimit.level) { \ ratelimit_reset(&_log_ratelimit.ratelimit); \ _log_ratelimit.error = _log_ratelimit_error; \ _log_ratelimit.level = _log_ratelimit_level; \ } \ if (ratelimit_below(&_log_ratelimit.ratelimit)) \ _log_ratelimit_error = _num_dropped_errors > 0 \ ? log_internal(_log_ratelimit_level, _log_ratelimit_error, _file, _line, _func, _format " (Dropped %u similar message(s))", __VA_ARGS__, _num_dropped_errors) \ : log_internal(_log_ratelimit_level, _log_ratelimit_error, _file, _line, _func, _format, __VA_ARGS__); \ _log_ratelimit_error; \ }) #define log_ratelimit_full_errno(level, error, format, ...) \ ({ \ int _level = (level), _e = (error); \ _e = (log_get_max_level() >= LOG_PRI(_level)) \ ? log_ratelimit_internal(_level, _e, format, PROJECT_FILE, __LINE__, __func__, __VA_ARGS__) \ : -ERRNO_VALUE(_e); \ _e < 0 ? _e : -ESTRPIPE; \ })