aboutsummaryrefslogtreecommitdiff
path: root/src/common/torlog.h
blob: ecd7e121eb078bfb7b42b71d0085915fd95f2439 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/* 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;

/** 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