Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 409 insertions, 0 deletions

diff --git a/src/basic/log.h b/src/basic/log.h
new file mode 100644
index 0000000..560686e
--- /dev/null
+++ b/src/basic/log.h
@@ -0,0 +1,409 @@
+/* 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 "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;                                \
+        })