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/* Copyright (c) 2001, Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file torlog.h
*
* \brief Headers for log.c
**/
#ifndef TOR_TORLOG_H
#include "compat.h"
#ifdef HAVE_SYSLOG_H
#include <syslog.h>
#define LOG_WARN LOG_WARNING
#if LOG_DEBUG < LOG_ERR
#error "Your syslog.h thinks high numbers are more important. " \
"We aren't prepared to deal with that."
#endif
#else
/* Note: Syslog's logging code refers to priorities, with 0 being the most
* important. Thus, all our comparisons needed to be reversed when we added
* syslog support.
*
* The upshot of this is that comments about log levels may be messed up: for
* "maximum severity" read "most severe" and "numerically *lowest* severity".
*/
/** Debug-level severity: for hyper-verbose messages of no interest to
* anybody but developers. */
#define LOG_DEBUG 7
/** Info-level severity: for messages that appear frequently during normal
* operation. */
#define LOG_INFO 6
/** Notice-level severity: for messages that appear infrequently
* during normal operation; that the user will probably care about;
* and that are not errors.
*/
#define LOG_NOTICE 5
/** Warn-level severity: for messages that only appear when something has gone
* wrong. */
#define LOG_WARN 4
/** Error-level severity: for messages that only appear when something has gone
* very wrong, and the Tor process can no longer proceed. */
#define LOG_ERR 3
#endif
/* Logging domains */
/** Catch-all for miscellaneous events and fatal errors. */
#define LD_GENERAL (1u<<0)
/** The cryptography subsystem. */
#define LD_CRYPTO (1u<<1)
/** Networking. */
#define LD_NET (1u<<2)
/** Parsing and acting on our configuration. */
#define LD_CONFIG (1u<<3)
/** Reading and writing from the filesystem. */
#define LD_FS (1u<<4)
/** Other servers' (non)compliance with the Tor protocol. */
#define LD_PROTOCOL (1u<<5)
/** Memory management. */
#define LD_MM (1u<<6)
/** HTTP implementation. */
#define LD_HTTP (1u<<7)
/** Application (socks) requests. */
#define LD_APP (1u<<8)
/** Communication via the controller protocol. */
#define LD_CONTROL (1u<<9)
/** Building, using, and managing circuits. */
#define LD_CIRC (1u<<10)
/** Hidden services. */
#define LD_REND (1u<<11)
/** Internal errors in this Tor process. */
#define LD_BUG (1u<<12)
/** Learning and using information about Tor servers. */
#define LD_DIR (1u<<13)
/** Learning and using information about Tor servers. */
#define LD_DIRSERV (1u<<14)
/** Onion routing protocol. */
#define LD_OR (1u<<15)
/** Generic edge-connection functionality. */
#define LD_EDGE (1u<<16)
#define LD_EXIT LD_EDGE
/** Bandwidth accounting. */
#define LD_ACCT (1u<<17)
/** Router history */
#define LD_HIST (1u<<18)
/** OR handshaking */
#define LD_HANDSHAKE (1u<<19)
/** Heartbeat messages */
#define LD_HEARTBEAT (1u<<20)
/** Abstract channel_t code */
#define LD_CHANNEL (1u<<21)
/** Number of logging domains in the code. */
#define N_LOGGING_DOMAINS 22
/** This log message is not safe to send to a callback-based logger
* immediately. Used as a flag, not a log domain. */
#define LD_NOCB (1u<<31)
/** Mask of zero or more log domains, OR'd together. */
typedef uint32_t log_domain_mask_t;
/** Configures which severities are logged for each logging domain for a given
* log target. */
typedef struct log_severity_list_t {
/** For each log severity, a bitmask of which domains a given logger is
* logging. */
log_domain_mask_t masks[LOG_DEBUG-LOG_ERR+1];
} log_severity_list_t;
#ifdef LOG_PRIVATE
/** Given a severity, yields an index into log_severity_list_t.masks to use
* for that severity. */
#define SEVERITY_MASK_IDX(sev) ((sev) - LOG_ERR)
#endif
/** Callback type used for add_callback_log. */
typedef void (*log_callback)(int severity, uint32_t domain, const char *msg);
void init_logging(void);
int parse_log_level(const char *level);
const char *log_level_to_string(int level);
int parse_log_severity_config(const char **cfg,
log_severity_list_t *severity_out);
void set_log_severity_config(int minSeverity, int maxSeverity,
log_severity_list_t *severity_out);
void add_stream_log(const log_severity_list_t *severity, const char *name,
int fd);
int add_file_log(const log_severity_list_t *severity, const char *filename);
#ifdef HAVE_SYSLOG_H
int add_syslog_log(const log_severity_list_t *severity);
#endif
int add_callback_log(const log_severity_list_t *severity, log_callback cb);
void logs_set_domain_logging(int enabled);
int get_min_log_level(void);
void switch_logs_debug(void);
void logs_free_all(void);
void add_temp_log(int min_severity);
int get_err_logging_fd(void);
void close_temp_logs(void);
void rollback_log_changes(void);
void mark_logs_temp(void);
void change_callback_log_severity(int loglevelMin, int loglevelMax,
log_callback cb);
void flush_pending_log_callbacks(void);
void log_set_application_name(const char *name);
void set_log_time_granularity(int granularity_msec);
void tor_log(int severity, log_domain_mask_t domain, const char *format, ...)
CHECK_PRINTF(3,4);
#if defined(__GNUC__) || defined(RUNNING_DOXYGEN)
extern int log_global_min_severity_;
void log_fn_(int severity, log_domain_mask_t domain,
const char *funcname, const char *format, ...)
CHECK_PRINTF(4,5);
struct ratelim_t;
void log_fn_ratelim_(struct ratelim_t *ratelim, int severity,
log_domain_mask_t domain, const char *funcname,
const char *format, ...)
CHECK_PRINTF(5,6);
/** Log a message at level <b>severity</b>, using a pretty-printed version
* of the current function name. */
#define log_fn(severity, domain, args...) \
log_fn_(severity, domain, __PRETTY_FUNCTION__, args)
/** As log_fn, but use <b>ratelim</b> (an instance of ratelim_t) to control
* the frequency at which messages can appear.
*/
#define log_fn_ratelim(ratelim, severity, domain, args...) \
log_fn_ratelim_(ratelim, severity, domain, __PRETTY_FUNCTION__, args)
#define log_debug(domain, args...) \
STMT_BEGIN \
if (PREDICT_UNLIKELY(log_global_min_severity_ == LOG_DEBUG)) \
log_fn_(LOG_DEBUG, domain, __PRETTY_FUNCTION__, args); \
STMT_END
#define log_info(domain, args...) \
log_fn_(LOG_INFO, domain, __PRETTY_FUNCTION__, args)
#define log_notice(domain, args...) \
log_fn_(LOG_NOTICE, domain, __PRETTY_FUNCTION__, args)
#define log_warn(domain, args...) \
log_fn_(LOG_WARN, domain, __PRETTY_FUNCTION__, args)
#define log_err(domain, args...) \
log_fn_(LOG_ERR, domain, __PRETTY_FUNCTION__, args)
#else /* ! defined(__GNUC__) */
void log_fn_(int severity, log_domain_mask_t domain, const char *format, ...);
struct ratelim_t;
void log_fn_ratelim_(struct ratelim_t *ratelim, int severity,
log_domain_mask_t domain, const char *format, ...);
void log_debug_(log_domain_mask_t domain, const char *format, ...);
void log_info_(log_domain_mask_t domain, const char *format, ...);
void log_notice_(log_domain_mask_t domain, const char *format, ...);
void log_warn_(log_domain_mask_t domain, const char *format, ...);
void log_err_(log_domain_mask_t domain, const char *format, ...);
#if defined(_MSC_VER) && _MSC_VER < 1300
/* MSVC 6 and earlier don't have __func__, or even __LINE__. */
#define log_fn log_fn_
#define log_fn_ratelim log_fn_ratelim_
#define log_debug log_debug_
#define log_info log_info_
#define log_notice log_notice_
#define log_warn log_warn_
#define log_err log_err_
#else
/* We don't have GCC's varargs macros, so use a global variable to pass the
* function name to log_fn */
extern const char *log_fn_function_name_;
/* We abuse the comma operator here, since we can't use the standard
* do {...} while (0) trick to wrap this macro, since the macro can't take
* arguments. */
#define log_fn (log_fn_function_name_=__func__),log_fn_
#define log_fn_ratelim (log_fn_function_name_=__func__),log_fn_ratelim_
#define log_debug (log_fn_function_name_=__func__),log_debug_
#define log_info (log_fn_function_name_=__func__),log_info_
#define log_notice (log_fn_function_name_=__func__),log_notice_
#define log_warn (log_fn_function_name_=__func__),log_warn_
#define log_err (log_fn_function_name_=__func__),log_err_
#endif
#endif /* !GNUC */
# define TOR_TORLOG_H
#endif
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