src/logger.c

   1 /*
   2     logger.c -- logging code
   3     Copyright (C) 2004-2016 Guus Sliepen <guus@tinc-vpn.org>
   4                   2004-2005 Ivo Timmermans
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License along
  17     with this program; if not, write to the Free Software Foundation, Inc.,
  18     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "system.h"
  22
  23 #include "conf.h"
  24 #include "logger.h"
  25
  26 debug_t debug_level = DEBUG_NOTHING;
  27 static logmode_t logmode = LOGMODE_STDERR;
  28 static pid_t logpid;
  29 extern char *logfilename;
  30 static FILE *logfile = NULL;
  31 #ifdef HAVE_MINGW
  32 static HANDLE loghandle = NULL;
  33 #endif
  34 static const char *logident = NULL;
  35
  36 void openlogger(const char *ident, logmode_t mode) {
  37         logident = ident;
  38         logmode = mode;
  39
  40         switch(mode) {
  41                 case LOGMODE_STDERR:
  42                         logpid = getpid();
  43                         break;
  44                 case LOGMODE_FILE:
  45                         logpid = getpid();
  46                         logfile = fopen(logfilename, "a");
  47                         if(!logfile) {
  48                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
  49                                 logmode = LOGMODE_NULL;
  50                         }
  51                         break;
  52                 case LOGMODE_SYSLOG:
  53 #ifdef HAVE_MINGW
  54                         loghandle = RegisterEventSource(NULL, logident);
  55                         if(!loghandle) {
  56                                 fprintf(stderr, "Could not open log handle!");
  57                                 logmode = LOGMODE_NULL;
  58                         }
  59                         break;
  60 #else
  61 #ifdef HAVE_SYSLOG_H
  62                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
  63                         break;
  64 #endif
  65 #endif
  66                 case LOGMODE_NULL:
  67                         break;
  68         }
  69 }
  70
  71 void reopenlogger() {
  72         if(logmode != LOGMODE_FILE)
  73                 return;
  74
  75         fflush(logfile);
  76         FILE *newfile = fopen(logfilename, "a");
  77         if(!newfile) {
  78                 logger(LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
  79                 return;
  80         }
  81         fclose(logfile);
  82         logfile = newfile;
  83 }
  84
  85 void logger(int priority, const char *format, ...) {
  86         va_list ap;
  87         char timestr[32] = "";
  88         time_t now;
  89
  90         va_start(ap, format);
  91
  92         switch(logmode) {
  93                 case LOGMODE_STDERR:
  94                         vfprintf(stderr, format, ap);
  95                         fprintf(stderr, "\n");
  96                         fflush(stderr);
  97                         break;
  98                 case LOGMODE_FILE:
  99                         now = time(NULL);
 100                         strftime(timestr, sizeof timestr, "%Y-%m-%d %H:%M:%S", localtime(&now));
 101                         fprintf(logfile, "%s %s[%ld]: ", timestr, logident, (long)logpid);
 102                         vfprintf(logfile, format, ap);
 103                         fprintf(logfile, "\n");
 104                         fflush(logfile);
 105                         break;
 106                 case LOGMODE_SYSLOG:
 107 #ifdef HAVE_MINGW
 108                         {
 109                                 char message[4096];
 110                                 const char *messages[] = {message};
 111                                 vsnprintf(message, sizeof(message), format, ap);
 112                                 message[sizeof message - 1] = 0;
 113                                 ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
 114                         }
 115 #else
 116 #ifdef HAVE_SYSLOG_H
 117 #ifdef HAVE_VSYSLOG
 118                         vsyslog(priority, format, ap);
 119 #else
 120                         {
 121                                 char message[4096];
 122                                 vsnprintf(message, sizeof(message), format, ap);
 123                                 syslog(priority, "%s", message);
 124                         }
 125 #endif
 126                         break;
 127 #endif
 128 #endif
 129                 case LOGMODE_NULL:
 130                         break;
 131         }
 132
 133         va_end(ap);
 134 }
 135
 136 void closelogger(void) {
 137         switch(logmode) {
 138                 case LOGMODE_FILE:
 139                         fclose(logfile);
 140                         break;
 141                 case LOGMODE_SYSLOG:
 142 #ifdef HAVE_MINGW
 143                         DeregisterEventSource(loghandle);
 144                         break;
 145 #else
 146 #ifdef HAVE_SYSLOG_H
 147                         closelog();
 148                         break;
 149 #endif
 150 #endif
 151                 case LOGMODE_NULL:
 152                 case LOGMODE_STDERR:
 153                         break;
 154                         break;
 155         }
 156 }