unbound/util/log.h

   1 /*
   2  * util/log.h - logging service
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains logging functions.
  40  */
  41
  42 #ifndef UTIL_LOG_H
  43 #define UTIL_LOG_H
  44 struct sldns_buffer;
  45
  46 /**
  47  * verbosity value:
  48  */
  49 enum verbosity_value {
  50  /** 0 - no verbose messages */
  51         NO_VERBOSE = 0,
  52  /** 1 - operational information */
  53         VERB_OPS,
  54  /** 2 - detailed information */
  55         VERB_DETAIL,
  56  /** 3 - query level information */
  57         VERB_QUERY,
  58  /** 4 - algorithm level information */
  59         VERB_ALGO,
  60  /** 5 - querier client information */
  61         VERB_CLIENT
  62 };
  63
  64 /** The global verbosity setting */
  65 extern enum verbosity_value verbosity;
  66
  67 /**
  68  * log a verbose message, pass the level for this message.
  69  * It has printf formatted arguments. No trailing newline is needed.
  70  * @param level: verbosity level for this message, compared to global
  71  *      verbosity setting.
  72  * @param format: printf-style format string. Arguments follow.
  73  */
  74 void verbose(enum verbosity_value level,
  75         const char* format, ...) ATTR_FORMAT(printf, 2, 3);
  76
  77 /**
  78  * call this to initialize logging services.
  79  * @param filename: if NULL stderr is used.
  80  * @param use_syslog: set to true to ignore filename and use syslog(3).
  81  * @param chrootdir: to which directory we have been chrooted, if any.
  82  */
  83 void log_init(const char* filename, int use_syslog, const char* chrootdir);
  84
  85 /**
  86  * Set logging to go to the specified file *.
  87  * This setting does not affect the use_syslog setting.
  88  * @param f: to that file, or pass NULL to disable logging.
  89  */
  90 void log_file(FILE *f);
  91
  92 /**
  93  * Init a thread (will print this number for the thread log entries).
  94  * Must be called from the thread itself. If not called 0 is printed.
  95  * @param num: number to print for this thread. Owned by caller, must
  96  *      continue to exist.
  97  */
  98 void log_thread_set(int* num);
  99
 100 /**
 101  * Set identity to print, default is 'unbound'.
 102  * @param id: string to print. Name of executable.
 103  */
 104 void log_ident_set(const char* id);
 105
 106 /**
 107  * Set the time value to print in log entries.
 108  * @param t: the point is copied and used to find the time.
 109  *      if NULL, time(2) is used.
 110  */
 111 void log_set_time(time_t* t);
 112
 113 /**
 114  * Set if the time value is printed ascii or decimal in log entries.
 115  * @param use_asc: if true, ascii is printed, otherwise decimal.
 116  *      If the conversion fails or you have no time functions,
 117  *      decimal is printed.
 118  */
 119 void log_set_time_asc(int use_asc);
 120
 121 /**
 122  * Log informational message.
 123  * Pass printf formatted arguments. No trailing newline is needed.
 124  * @param format: printf-style format string. Arguments follow.
 125  */
 126 void log_info(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
 127
 128 /**
 129  * Log error message.
 130  * Pass printf formatted arguments. No trailing newline is needed.
 131  * @param format: printf-style format string. Arguments follow.
 132  */
 133 void log_err(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
 134
 135 /**
 136  * Log warning message.
 137  * Pass printf formatted arguments. No trailing newline is needed.
 138  * @param format: printf-style format string. Arguments follow.
 139  */
 140 void log_warn(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
 141
 142 /**
 143  * Log a hex-string to the log. Can be any length.
 144  * performs mallocs to do so, slow. But debug useful.
 145  * @param msg: string desc to accompany the hexdump.
 146  * @param data: data to dump in hex format.
 147  * @param length: length of data.
 148  */
 149 void log_hex(const char* msg, void* data, size_t length);
 150
 151 /**
 152  * Easy alternative for log_hex, takes a sldns_buffer.
 153  * @param level: verbosity level for this message, compared to global
 154  *      verbosity setting.
 155  * @param msg: string desc to print
 156  * @param buf: the buffer.
 157  */
 158 void log_buf(enum verbosity_value level, const char* msg, struct sldns_buffer* buf);
 159
 160 /**
 161  * Log fatal error message, and exit the current process.
 162  * Pass printf formatted arguments. No trailing newline is needed.
 163  * @param format: printf-style format string. Arguments follow.
 164  */
 165 void fatal_exit(const char* format, ...) ATTR_FORMAT(printf, 1, 2);
 166
 167 /**
 168  * va_list argument version of log_info.
 169  * @param pri: priority type, for example 5 (INFO).
 170  * @param type: string to designate type of message (info, error).
 171  * @param format: the printf style format to print. no newline.
 172  * @param args: arguments for format string.
 173  */
 174 void log_vmsg(int pri, const char* type, const char* format, va_list args);
 175
 176 /**
 177  * an assertion that is thrown to the logfile.
 178  */
 179 #ifdef UNBOUND_DEBUG
 180 #  define log_assert(x) \
 181         do { if(!(x)) \
 182                 fatal_exit("%s:%d: %s: assertion %s failed", \
 183                         __FILE__, __LINE__, __func__, #x); \
 184         } while(0);
 185 #else
 186 #  define log_assert(x) /*nothing*/
 187 #endif
 188
 189 #ifdef USE_WINSOCK
 190 /**
 191  * Convert WSA error into string.
 192  * @param err: from WSAGetLastError()
 193  * @return: string.
 194  */
 195 char* wsa_strerror(DWORD err);
 196 #endif /* USE_WINSOCK */
 197
 198 #endif /* UTIL_LOG_H */