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/*
* util/log.h - logging service
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains logging functions.
*/
#ifndef UTIL_LOG_H
#define UTIL_LOG_H
struct sldns_buffer;
/**
* verbosity value:
*/
enum verbosity_value {
/** 0 - no verbose messages */
NO_VERBOSE = 0,
/** 1 - operational information */
VERB_OPS,
/** 2 - detailed information */
VERB_DETAIL,
/** 3 - query level information */
VERB_QUERY,
/** 4 - algorithm level information */
VERB_ALGO,
/** 5 - querier client information */
VERB_CLIENT
};
/** The global verbosity setting */
extern enum verbosity_value verbosity;
/**
* log a verbose message, pass the level for this message.
* It has printf formatted arguments. No trailing newline is needed.
* @param level: verbosity level for this message, compared to global
* verbosity setting.
* @param format: printf-style format string. Arguments follow.
*/
void verbose(enum verbosity_value level,
const char* format, ...) ATTR_FORMAT(printf, 2, 3);
/**
* call this to initialize logging services.
* @param filename: if NULL stderr is used.
* @param use_syslog: set to true to ignore filename and use syslog(3).
* @param chrootdir: to which directory we have been chrooted, if any.
*/
void log_init(const char* filename, int use_syslog, const char* chrootdir);
/**
* Set logging to go to the specified file *.
* This setting does not affect the use_syslog setting.
* @param f: to that file, or pass NULL to disable logging.
*/
void log_file(FILE *f);
/**
* Init a thread (will print this number for the thread log entries).
* Must be called from the thread itself. If not called 0 is printed.
* @param num: number to print for this thread. Owned by caller, must
* continue to exist.
*/
void log_thread_set(int* num);
/**
* Get the thread id from logging system. Set after log_init is
* initialised, or log_thread_set for newly created threads.
* This initialisation happens in unbound as a daemon, in daemon
* startup code, when that spawns threads.
* @return thread number, from 0 and up. Before initialised, returns 0.
*/
int log_thread_get(void);
/**
* Set identity to print, default is 'unbound'.
* @param id: string to print. Name of executable.
*/
void log_ident_set(const char* id);
/**
* Set default identity to print, default is 'unbound'.
* @param id: string to print. Name of executable.
*/
void log_ident_set_default(const char* id);
/**
* Revert identity to print, back to the recorded default value.
*/
void log_ident_revert_to_default(void);
/**
* Set identity to print if there is an identity, otherwise
* set the default.
* @param identity: the identity to set.
*/
void log_ident_set_or_default(const char* identity);
/**
* Set if the time value is printed ascii or decimal in log entries.
* @param use_asc: if true, ascii is printed, otherwise decimal.
* If the conversion fails or you have no time functions,
* decimal is printed.
*/
void log_set_time_asc(int use_asc);
/** get log lock */
void* log_get_lock(void);
/**
* Log informational message.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void log_info(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
/**
* Log error message.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void log_err(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
/**
* Log warning message.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void log_warn(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
/**
* Log a hex-string to the log. Can be any length.
* performs mallocs to do so, slow. But debug useful.
* @param msg: string desc to accompany the hexdump.
* @param data: data to dump in hex format.
* @param length: length of data.
*/
void log_hex(const char* msg, void* data, size_t length);
/**
* Log query.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void log_query(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
/**
* Log reply.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void log_reply(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
/**
* Easy alternative for log_hex, takes a sldns_buffer.
* @param level: verbosity level for this message, compared to global
* verbosity setting.
* @param msg: string desc to print
* @param buf: the buffer.
*/
void log_buf(enum verbosity_value level, const char* msg, struct sldns_buffer* buf);
/**
* Log fatal error message, and exit the current process.
* Pass printf formatted arguments. No trailing newline is needed.
* @param format: printf-style format string. Arguments follow.
*/
void fatal_exit(const char* format, ...) ATTR_FORMAT(printf, 1, 2) ATTR_NORETURN;
/**
* va_list argument version of log_info.
* @param pri: priority type, for example 5 (INFO).
* @param type: string to designate type of message (info, error).
* @param format: the printf style format to print. no newline.
* @param args: arguments for format string.
*/
void log_vmsg(int pri, const char* type, const char* format, va_list args);
/**
* an assertion that is thrown to the logfile.
*/
#ifdef UNBOUND_DEBUG
#ifdef __clang_analyzer__
/* clang analyzer needs to know that log_assert is an assertion, otherwise
* it could complain about the nullptr the assert is guarding against. */
#define log_assert(x) assert(x)
#else
# define log_assert(x) \
do { if(!(x)) \
fatal_exit("%s:%d: %s: assertion %s failed", \
__FILE__, __LINE__, __func__, #x); \
} while(0);
#endif
#else
# define log_assert(x) /*nothing*/
#endif
#ifdef USE_WINSOCK
/**
* Convert WSA error into string.
* @param err: from WSAGetLastError()
* @return: string.
*/
char* wsa_strerror(DWORD err);
#endif /* USE_WINSOCK */
#endif /* UTIL_LOG_H */
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