src/helper/log.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "log.h"
  25 #include "configuration.h"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdarg.h>
  31 #include <time.h>
  32
  33 int debug_level = -1;
  34
  35 static FILE* log_output;
  36
  37 static void *privData;
  38 static logCallback callback;
  39
  40 void log_setCallback(logCallback c, void *p)
  41 {
  42         callback = c;
  43         privData = p;
  44 }
  45
  46 static char *log_strings[4] =
  47 {
  48         "Error:  ",
  49         "Warning:",
  50         "Info:   ",
  51         "Debug:  ",
  52 };
  53
  54 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
  55 {
  56         static int count = 0;
  57         count++;
  58         va_list args;
  59         char buffer[512];
  60
  61         if (level > debug_level)
  62                 return;
  63
  64         va_start(args, format);
  65         vsnprintf(buffer, 512, format, args);
  66
  67         char *f = strrchr(file, '/');
  68         if (f != NULL)
  69                 file = f + 1;
  70
  71         fprintf(log_output, "%s %d %ld %s:%d %s(): %s\n", log_strings[level], count, time(NULL), file, line, function, buffer);
  72         fflush(log_output);
  73
  74         va_end(args);
  75
  76         /* Never forward LOG_DEBUG, too verbose and they can be found in the log if need be */
  77         if (callback && (level <= LOG_INFO))
  78         {
  79                 va_start(args, format);
  80                 callback(privData, file, line, function, format, args);
  81                 va_end(args);
  82         }
  83 }
  84
  85 /* change the current debug level on the fly
  86  * 0: only ERRORS
  87  * 1: + WARNINGS
  88  * 2: + INFORMATIONAL MSGS
  89  * 3: + DEBUG MSGS
  90  */
  91 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
  92 {
  93         if (argc == 0)
  94                 command_print(cmd_ctx, "debug_level: %i", debug_level);
  95
  96         if (argc > 0)
  97                 debug_level = strtoul(args[0], NULL, 0);
  98
  99         if (debug_level < 0)
 100                 debug_level = 0;
 101
 102         if (debug_level > 3)
 103                 debug_level = 3;
 104
 105         return ERROR_OK;
 106 }
 107
 108 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 109 {
 110         if (argc == 1)
 111         {
 112                 FILE* file = fopen(args[0], "w");
 113
 114                 if (file)
 115                 {
 116                         log_output = file;
 117                 }
 118         }
 119
 120         return ERROR_OK;
 121 }
 122
 123 int log_register_commands(struct command_context_s *cmd_ctx)
 124 {
 125         register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
 126                 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
 127         register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
 128                 COMMAND_ANY, "adjust debug level <0-3>");
 129
 130         return ERROR_OK;
 131 }
 132
 133 int log_init(struct command_context_s *cmd_ctx)
 134 {
 135         /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
 136         if (debug_level == -1)
 137                 debug_level = LOG_INFO;
 138
 139         if (log_output == NULL)
 140         {
 141                 log_output = stderr;
 142         }
 143
 144         return ERROR_OK;
 145 }
 146
 147 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
 148 {
 149         log_output = output;
 150         return ERROR_OK;
 151 }
 152
 153 /* return allocated string w/printf() result */
 154 char *allocPrintf(const char *fmt, va_list ap)
 155 {
 156         char *string = NULL;
 157
 158         /* start by 0 to exercise all the code paths. Need minimum 2 bytes to
 159          * fit 1 char and 0 terminator. */
 160         int size = 0;
 161         int first = 1;
 162         for (;;)
 163         {
 164                 if ((string == NULL) || (!first))
 165                 {
 166                         size = size * 2 + 2;
 167                         char *t = string;
 168                         string = realloc(string, size);
 169                         if (string == NULL)
 170                         {
 171                                 if (t != NULL)
 172                                         free(t);
 173                                 return NULL;
 174                         }
 175                 }
 176
 177             int ret;
 178             ret = vsnprintf(string, size, fmt, ap);
 179             /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
 180             if ((ret >= 0) && ((ret + 1) < size))
 181             {
 182                 return string;
 183             }
 184             /* there was just enough or not enough space, allocate more. */
 185             first = 0;
 186         }
 187 }