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
  38 static void *privData;
  39 static logCallback callback;
  40
  41 void log_setCallback(logCallback c, void *p)
  42 {
  43         callback=c;
  44         privData=p;
  45 }
  46
  47 static char *log_strings[4] =
  48 {
  49         "Error:  ",
  50         "Warning:",
  51         "Info:   ",
  52         "Debug:  ",
  53 };
  54
  55 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
  56 {
  57         static int count=0;
  58         count++;
  59         va_list args;
  60         char buffer[512];
  61
  62         if (level > debug_level)
  63                 return;
  64
  65         va_start(args, format);
  66         vsnprintf(buffer, 512, format, args);
  67
  68         char *f=strrchr(file, '/');
  69         if (f!=NULL)
  70                 file=f+1;
  71
  72         fprintf(log_output, "%s %d %d %s:%d %s(): %s\n", log_strings[level], count, time(NULL), file, line, function, buffer);
  73         fflush(log_output);
  74
  75         va_end(args);
  76
  77         /* Never forward LOG_DEBUG, too verbose and they can be found in the log if need be */
  78         if (callback&&(level<=LOG_INFO))
  79
  80         {
  81                 va_start(args, format);
  82
  83                 callback(privData, file, line, function, format, args);
  84
  85                 va_end(args);
  86         }
  87
  88 }
  89
  90 /* change the current debug level on the fly
  91  * 0: only ERRORS
  92  * 1: + WARNINGS
  93  * 2: + INFORMATIONAL MSGS
  94  * 3: + DEBUG MSGS
  95  */
  96 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
  97 {
  98         if (argc == 0)
  99                 command_print(cmd_ctx, "debug_level: %i", debug_level);
 100
 101         if (argc > 0)
 102                 debug_level = strtoul(args[0], NULL, 0);
 103
 104         if (debug_level < 0)
 105                 debug_level = 0;
 106
 107         if (debug_level > 3)
 108                 debug_level = 3;
 109
 110         return ERROR_OK;
 111 }
 112
 113 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 114 {
 115         if (argc == 1)
 116         {
 117                 FILE* file = fopen(args[0], "w");
 118
 119                 if (file)
 120                 {
 121                         log_output = file;
 122                 }
 123         }
 124
 125         return ERROR_OK;
 126 }
 127
 128 int log_register_commands(struct command_context_s *cmd_ctx)
 129 {
 130         register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
 131                 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
 132         register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
 133                 COMMAND_ANY, "adjust debug level <0-3>");
 134
 135         return ERROR_OK;
 136 }
 137
 138 int log_init(struct command_context_s *cmd_ctx)
 139 {
 140         /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
 141         if (debug_level == -1)
 142                 debug_level = LOG_INFO;
 143
 144         if (log_output == NULL)
 145         {
 146                 log_output = stderr;
 147         }
 148
 149         return ERROR_OK;
 150 }
 151
 152 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
 153 {
 154         log_output=output;
 155         return ERROR_OK;
 156 }
 157
 158 /* return allocated string w/printf() result */
 159 char *allocPrintf(const char *fmt, va_list ap)
 160 {
 161         char *string=NULL;
 162         int size=0; // start by 0 to exercise all the code paths. Need minimum 2 bytes to fit 1 char and 0 terminator.
 163         int first=1;
 164         for (;;)
 165         {
 166                 if ((string==NULL)||(!first))
 167                 {
 168                         size=size*2+2;
 169                         char *t=string;
 170                         string=realloc(string, size);
 171                         if (string==NULL)
 172                         {
 173                                 if (t!=NULL)
 174                                         free(t);
 175                                 return NULL;
 176                         }
 177                 }
 178
 179             int ret;
 180             ret = vsnprintf(string, size, fmt, ap);
 181             // NB! The result of the vsnprintf() might be an *EMPTY* string!
 182             if ((ret>=0)&&((ret+1)<size))
 183             {
 184                 return string;
 185             }
 186             // there was just enough or not enough space, allocate more.
 187             first=0;
 188         }
 189 }