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[5] =
  47 {
  48         "User:  ",
  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 %ld %s:%d %s(): %s\n", log_strings[level+1], 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                 va_start(args, format);
  81                 callback(privData, file, line, function, format, args);
  82                 va_end(args);
  83         }
  84 }
  85
  86 /* change the current debug level on the fly
  87  * 0: only ERRORS
  88  * 1: + WARNINGS
  89  * 2: + INFORMATIONAL MSGS
  90  * 3: + DEBUG MSGS
  91  */
  92 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
  93 {
  94         if (argc == 0)
  95                 command_print(cmd_ctx, "debug_level: %i", debug_level);
  96
  97         if (argc > 0)
  98                 debug_level = strtoul(args[0], NULL, 0);
  99
 100         if (debug_level < 0)
 101                 debug_level = 0;
 102
 103         if (debug_level > 3)
 104                 debug_level = 3;
 105
 106         return ERROR_OK;
 107 }
 108
 109 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 110 {
 111         if (argc == 1)
 112         {
 113                 FILE* file = fopen(args[0], "w");
 114
 115                 if (file)
 116                 {
 117                         log_output = file;
 118                 }
 119         }
 120
 121         return ERROR_OK;
 122 }
 123
 124 int log_register_commands(struct command_context_s *cmd_ctx)
 125 {
 126         register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
 127                 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
 128         register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
 129                 COMMAND_ANY, "adjust debug level <0-3>");
 130
 131         return ERROR_OK;
 132 }
 133
 134 int log_init(struct command_context_s *cmd_ctx)
 135 {
 136         /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
 137         if (debug_level == -1)
 138                 debug_level = LOG_INFO;
 139
 140         if (log_output == NULL)
 141         {
 142                 log_output = stderr;
 143         }
 144
 145         return ERROR_OK;
 146 }
 147
 148 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
 149 {
 150         log_output = output;
 151         return ERROR_OK;
 152 }
 153
 154 /* return allocated string w/printf() result */
 155 char *allocPrintf(const char *fmt, va_list ap)
 156 {
 157         char *string = NULL;
 158
 159         /* start by 0 to exercise all the code paths. Need minimum 2 bytes to
 160          * fit 1 char and 0 terminator. */
 161         int size = 0;
 162         int first = 1;
 163         for (;;)
 164         {
 165                 if ((string == NULL) || (!first))
 166                 {
 167                         size = size * 2 + 2;
 168                         char *t = string;
 169                         string = realloc(string, size);
 170                         if (string == NULL)
 171                         {
 172                                 if (t != NULL)
 173                                         free(t);
 174                                 return NULL;
 175                         }
 176                 }
 177
 178             int ret;
 179             ret = vsnprintf(string, size, fmt, ap);
 180             /* NB! The result of the vsnprintf() might be an *EMPTY* string! */
 181             if ((ret >= 0) && ((ret + 1) < size))
 182             {
 183                 return string;
 184             }
 185             /* there was just enough or not enough space, allocate more. */
 186             first = 0;
 187         }
 188 }