git.meshlink.io Git - meshlink/blob - src/logger.c

   1 /*
   2     logger.c -- logging code
   3     Copyright (C) 2004-2013 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 "meta.h"
  25 #include "names.h"
  26 #include "logger.h"
  27 #include "connection.h"
  28 #include "sptps.h"
  29
  30 debug_t debug_level = DEBUG_NOTHING;
  31 static logmode_t logmode = LOGMODE_STDERR;
  32 static pid_t logpid;
  33 static FILE *logfile = NULL;
  34 #ifdef HAVE_MINGW
  35 static HANDLE loghandle = NULL;
  36 #endif
  37 static const char *logident = NULL;
  38
  39 static void real_logger(int level, int priority, const char *message) {
  40         char timestr[32] = "";
  41         static bool suppress = false;
  42
  43         // Bail out early if there is nothing to do.
  44         if(suppress)
  45                 return;
  46
  47         if(level > debug_level || logmode == LOGMODE_NULL)
  48                 return;
  49
  50         if(level <= debug_level) {
  51                 switch(logmode) {
  52                         case LOGMODE_STDERR:
  53                                 fprintf(stderr, "%s\n", message);
  54                                 fflush(stderr);
  55                                 break;
  56                         case LOGMODE_FILE:
  57                                 if(!now.tv_sec)
  58                                         gettimeofday(&now, NULL);
  59                                 time_t now_sec = now.tv_sec;
  60                                 strftime(timestr, sizeof timestr, "%Y-%m-%d %H:%M:%S", localtime(&now_sec));
  61                                 fprintf(logfile, "%s %s[%ld]: %s\n", timestr, logident, (long)logpid, message);
  62                                 fflush(logfile);
  63                                 break;
  64                         case LOGMODE_SYSLOG:
  65 #ifdef HAVE_MINGW
  66                                 {
  67                                         const char *messages[] = {message};
  68                                         ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
  69                                 }
  70 #else
  71 #ifdef HAVE_SYSLOG_H
  72                                 syslog(priority, "%s", message);
  73 #endif
  74 #endif
  75                                 break;
  76                         case LOGMODE_NULL:
  77                                 break;
  78                 }
  79         }
  80 }
  81
  82 void logger(int level, int priority, const char *format, ...) {
  83         va_list ap;
  84         char message[1024] = "";
  85
  86         va_start(ap, format);
  87         int len = vsnprintf(message, sizeof message, format, ap);
  88         va_end(ap);
  89
  90         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
  91                 message[len - 1] = 0;
  92
  93         real_logger(level, priority, message);
  94 }
  95
  96 static void sptps_logger(sptps_t *s, int s_errno, const char *format, va_list ap) {
  97         char message[1024] = "";
  98         int len = vsnprintf(message, sizeof message, format, ap);
  99         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
 100                 message[len - 1] = 0;
 101
 102         real_logger(DEBUG_ALWAYS, LOG_ERR, message);
 103 }
 104
 105 void openlogger(const char *ident, logmode_t mode) {
 106         logident = ident;
 107         logmode = mode;
 108
 109         switch(mode) {
 110                 case LOGMODE_STDERR:
 111                         logpid = getpid();
 112                         break;
 113                 case LOGMODE_FILE:
 114                         logpid = getpid();
 115                         logfile = fopen(logfilename, "a");
 116                         if(!logfile) {
 117                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 118                                 logmode = LOGMODE_NULL;
 119                         }
 120                         break;
 121                 case LOGMODE_SYSLOG:
 122 #ifdef HAVE_MINGW
 123                         loghandle = RegisterEventSource(NULL, logident);
 124                         if(!loghandle) {
 125                                 fprintf(stderr, "Could not open log handle!");
 126                                 logmode = LOGMODE_NULL;
 127                         }
 128                         break;
 129 #else
 130 #ifdef HAVE_SYSLOG_H
 131                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
 132                         break;
 133 #endif
 134 #endif
 135                 case LOGMODE_NULL:
 136                         break;
 137         }
 138
 139         if(logmode != LOGMODE_NULL)
 140                 sptps_log = sptps_logger;
 141         else
 142                 sptps_log = sptps_log_quiet;
 143 }
 144
 145 void reopenlogger() {
 146         if(logmode != LOGMODE_FILE)
 147                 return;
 148
 149         fflush(logfile);
 150         FILE *newfile = fopen(logfilename, "a");
 151         if(!newfile) {
 152                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
 153                 return;
 154         }
 155         fclose(logfile);
 156         logfile = newfile;
 157 }
 158
 159
 160 void closelogger(void) {
 161         switch(logmode) {
 162                 case LOGMODE_FILE:
 163                         fclose(logfile);
 164                         break;
 165                 case LOGMODE_SYSLOG:
 166 #ifdef HAVE_MINGW
 167                         DeregisterEventSource(loghandle);
 168                         break;
 169 #else
 170 #ifdef HAVE_SYSLOG_H
 171                         closelog();
 172                         break;
 173 #endif
 174 #endif
 175                 case LOGMODE_NULL:
 176                 case LOGMODE_STDERR:
 177                         break;
 178                         break;
 179         }
 180 }