systemd / systemd / 12858385481

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#pragma once

#include <stdarg.h>

#include <stdbool.h>

#include <stdlib.h>

#include <string.h>

#include <syslog.h>

#include "list.h"

#include "macro.h"

#include "ratelimit.h"

#include "stdio-util.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_KMSG,

        LOG_TARGET_JOURNAL,

        LOG_TARGET_SYSLOG,

        LOG_TARGET_CONSOLE_PREFIXED,

        LOG_TARGET_JOURNAL_OR_KMSG,

        LOG_TARGET_SYSLOG_OR_KMSG,

        LOG_TARGET_AUTO, /* console if stderr is not journal, JOURNAL_OR_KMSG otherwise */

        LOG_TARGET_NULL,

        _LOG_TARGET_SINGLE_MAX = LOG_TARGET_SYSLOG + 1,

        _LOG_TARGET_MAX = LOG_TARGET_NULL + 1,

        _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 as a regular log level. */

#define LOG_NULL (LOG_EMERG - 1)

assert_cc(LOG_NULL == -1);

#define SYNTHETIC_ERRNO(num)                (abs(num) | (1 << 30))

#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);

const char* log_target_to_string(LogTarget target) _const_;

LogTarget log_target_from_string(const char *s) _pure_;

void log_set_target(LogTarget target);

void log_set_target_and_open(LogTarget target);

int log_set_target_from_string(const char *e);

LogTarget log_get_target(void) _pure_;

void log_settle_target(void);

int log_set_max_level(int level);

int log_set_max_level_from_string(const char *e);

int log_get_max_level(void) _pure_;

int log_max_levels_to_string(int level, char **ret);

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])

bool stderr_is_journal(void);

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_full(level) log_oom_internal(level, PROJECT_FILE, __LINE__, __func__)

#define log_oom()           log_oom_full(LOG_ERR)

#define log_oom_debug()     log_oom_full(LOG_DEBUG)

#define log_oom_warning()   log_oom_full(LOG_WARNING)

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);

void log_set_assert_return_is_critical(bool b);

bool log_get_assert_return_is_critical(void) _pure_;

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);

int log_syntax_parse_error_internal(

                const char *unit,

                const char *config_file,

                unsigned config_line,

                int error,

                bool critical, /* When true, propagate the passed error, otherwise this always returns 0. */

                const char *file,

                int line,

                const char *func,

                const char *lvalue,

                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 log_syntax_parse_error_full(unit, config_file, config_line, error, critical, lvalue, rvalue) \

        log_syntax_parse_error_internal(unit, config_file, config_line, error, critical, PROJECT_FILE, __LINE__, __func__, lvalue, rvalue)

#define log_syntax_parse_error(unit, config_file, config_line, error, lvalue, rvalue) \

        log_syntax_parse_error_full(unit, config_file, config_line, error, /* critical = */ false, lvalue, rvalue)

#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, _ratelimit, _file, _line, _func, _format, ...)        \

({                                                                              \

        int _log_ratelimit_error = (_error);                                    \

        int _log_ratelimit_level = (_level);                                    \

        static LogRateLimit _log_ratelimit = {                                  \

                .ratelimit = (_ratelimit),                                      \

        };                                                                      \

        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 (log_get_max_level() == LOG_DEBUG || 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, _ratelimit, format, ...)             \

        ({                                                              \

                int _level = (level), _e = (error);                     \

                _e = (log_get_max_level() >= LOG_PRI(_level))           \

                        ? log_ratelimit_internal(_level, _e, _ratelimit, PROJECT_FILE, __LINE__, __func__, format, ##__VA_ARGS__) \

                        : -ERRNO_VALUE(_e);                             \

                _e < 0 ? _e : -ESTRPIPE;                                \

        })

#define log_ratelimit_full(level, _ratelimit, format, ...)                          \

        log_ratelimit_full_errno(level, 0, _ratelimit, format, ##__VA_ARGS__)

/* Normal logging */

#define log_ratelimit_info(...)      log_ratelimit_full(LOG_INFO,    __VA_ARGS__)

#define log_ratelimit_notice(...)    log_ratelimit_full(LOG_NOTICE,  __VA_ARGS__)

#define log_ratelimit_warning(...)   log_ratelimit_full(LOG_WARNING, __VA_ARGS__)

#define log_ratelimit_error(...)     log_ratelimit_full(LOG_ERR,     __VA_ARGS__)

#define log_ratelimit_emergency(...) log_ratelimit_full(log_emergency_level(), __VA_ARGS__)

/* Logging triggered by an errno-like error */

#define log_ratelimit_info_errno(error, ...)      log_ratelimit_full_errno(LOG_INFO,    error, __VA_ARGS__)

#define log_ratelimit_notice_errno(error, ...)    log_ratelimit_full_errno(LOG_NOTICE,  error, __VA_ARGS__)

#define log_ratelimit_warning_errno(error, ...)   log_ratelimit_full_errno(LOG_WARNING, error, __VA_ARGS__)

#define log_ratelimit_error_errno(error, ...)     log_ratelimit_full_errno(LOG_ERR,     error, __VA_ARGS__)

#define log_ratelimit_emergency_errno(error, ...) log_ratelimit_full_errno(log_emergency_level(), error, __VA_ARGS__)

const char* _log_set_prefix(const char *prefix, bool force);

}

#define LOG_SET_PREFIX(prefix) \

        _cleanup_(_log_unset_prefixp) _unused_ const char *CONCATENATE(_cleanup_log_unset_prefix_, UNIQ) = _log_set_prefix(prefix, false);

/*

 * The log context allows attaching extra metadata to log messages written to the journal via log.h. We keep

 * track of a thread local log context onto which we can push extra metadata fields that should be logged.

 *

 * LOG_CONTEXT_PUSH() will add the provided field to the log context and will remove it again when the

 * current block ends. LOG_CONTEXT_PUSH_STRV() will do the same but for all fields in the given strv.

 * LOG_CONTEXT_PUSHF() is like LOG_CONTEXT_PUSH() but takes a format string and arguments.

 *

 * Using the macros is as simple as putting them anywhere inside a block to add a field to all following log

 * messages logged from inside that block.

 *

 * void myfunction(...) {

 *         ...

 *

 *         LOG_CONTEXT_PUSHF("MYMETADATA=%s", "abc");

 *

 *         // Every journal message logged will now have the MYMETADATA=abc

 *         // field included.

 * }

 *

 * One special case to note is async code, where we use callbacks that are invoked to continue processing

 * when some event occurs. For async code, there's usually an associated "userdata" struct containing all the

 * information associated with the async operation. In this "userdata" struct, we can store a log context

 * allocated with log_context_new() and freed with log_context_free(). We can then add and remove fields to

 * the `fields` member of the log context object and all those fields will be logged along with each log

 * message.

 */

typedef struct LogContext LogContext;

bool log_context_enabled(void);

LogContext* log_context_new(const char *key, const char *value);

LogContext* log_context_new_strv(char **fields, bool owned);

LogContext* log_context_new_iov(struct iovec *input_iovec, size_t n_input_iovec, bool owned);

/* Same as log_context_new(), but frees the given fields strv/iovec on failure. */

LogContext* log_context_new_strv_consume(char **fields);

LogContext* log_context_new_iov_consume(struct iovec *input_iovec, size_t n_input_iovec);

LogContext *log_context_ref(LogContext *c);

LogContext *log_context_unref(LogContext *c);

/* Returns the number of attached log context objects. */

size_t log_context_num_contexts(void);

/* Returns the number of fields in all attached log contexts. */

size_t log_context_num_fields(void);

#define LOG_CONTEXT_SET_LOG_LEVEL(level) \

        _cleanup_(_reset_log_level) _unused_ int _saved_log_level_ = log_set_max_level(level);

#define LOG_CONTEXT_PUSH(...) \

        LOG_CONTEXT_PUSH_STRV(STRV_MAKE(__VA_ARGS__))

#define LOG_CONTEXT_PUSHF(...) \

        LOG_CONTEXT_PUSH(snprintf_ok((char[LINE_MAX]) {}, LINE_MAX, __VA_ARGS__))

#define _LOG_CONTEXT_PUSH_KEY_VALUE(key, value, c) \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new(key, value);

#define LOG_CONTEXT_PUSH_KEY_VALUE(key, value) \

        _LOG_CONTEXT_PUSH_KEY_VALUE(key, value, UNIQ_T(c, UNIQ))

#define _LOG_CONTEXT_PUSH_STRV(strv, c) \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new_strv(strv, /*owned=*/ false);

#define LOG_CONTEXT_PUSH_STRV(strv) \

        _LOG_CONTEXT_PUSH_STRV(strv, UNIQ_T(c, UNIQ))

#define _LOG_CONTEXT_PUSH_IOV(input_iovec, n_input_iovec, c) \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new_iov(input_iovec, n_input_iovec, /*owned=*/ false);

#define LOG_CONTEXT_PUSH_IOV(input_iovec, n_input_iovec) \

        _LOG_CONTEXT_PUSH_IOV(input_iovec, n_input_iovec, UNIQ_T(c, UNIQ))

/* LOG_CONTEXT_CONSUME_STR()/LOG_CONTEXT_CONSUME_STRV()/LOG_CONTEXT_CONSUME_IOV() are identical to

 * LOG_CONTEXT_PUSH_STR()/LOG_CONTEXT_PUSH_STRV()/LOG_CONTEXT_PUSH_IOV() except they take ownership of the

 * given str/strv argument.

 */

#define _LOG_CONTEXT_CONSUME_STR(s, c, strv) \

        _unused_ _cleanup_strv_free_ strv = strv_new(s);                                                \

        if (!strv)                                                                                      \

                free(s);                                                                                \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new_strv_consume(TAKE_PTR(strv))

#define LOG_CONTEXT_CONSUME_STR(s) \

        _LOG_CONTEXT_CONSUME_STR(s, UNIQ_T(c, UNIQ), UNIQ_T(sv, UNIQ))

#define _LOG_CONTEXT_CONSUME_STRV(strv, c) \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new_strv_consume(strv);

#define LOG_CONTEXT_CONSUME_STRV(strv) \

        _LOG_CONTEXT_CONSUME_STRV(strv, UNIQ_T(c, UNIQ))

#define _LOG_CONTEXT_CONSUME_IOV(input_iovec, n_input_iovec, c) \

        _unused_ _cleanup_(log_context_unrefp) LogContext *c = log_context_new_iov_consume(input_iovec, n_input_iovec);

#define LOG_CONTEXT_CONSUME_IOV(input_iovec, n_input_iovec) \

        _LOG_CONTEXT_CONSUME_IOV(input_iovec, n_input_iovec, UNIQ_T(c, UNIQ))