tinc-vpn.org Git - tinc/blob - src/logger.c

   1 /*
   2     logger.c -- logging code
   3     Copyright (C) 2004-2012 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 "logger.h"
  26 #include "connection.h"
  27 #include "control_common.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 extern char *logfilename;
  34 static FILE *logfile = NULL;
  35 #ifdef HAVE_MINGW
  36 static HANDLE loghandle = NULL;
  37 #endif
  38 static const char *logident = NULL;
  39 bool logcontrol = false;
  40
  41
  42 static void real_logger(int level, int priority, const char *message) {
  43         char timestr[32] = "";
  44         static bool suppress = false;
  45
  46         // Bail out early if there is nothing to do.
  47         if(suppress)
  48                 return;
  49
  50         if(!logcontrol && (level > debug_level || logmode == LOGMODE_NULL))
  51                 return;
  52
  53         if(level <= debug_level) {
  54                 switch(logmode) {
  55                         case LOGMODE_STDERR:
  56                                 fprintf(stderr, "%s\n", message);
  57                                 fflush(stderr);
  58                                 break;
  59                         case LOGMODE_FILE:
  60                                 if(!now.tv_sec)
  61                                         gettimeofday(&now, NULL);
  62                                 strftime(timestr, sizeof timestr, "%Y-%m-%d %H:%M:%S", localtime(&now.tv_sec));
  63                                 fprintf(logfile, "%s %s[%ld]: %s\n", timestr, logident, (long)logpid, message);
  64                                 fflush(logfile);
  65                                 break;
  66                         case LOGMODE_SYSLOG:
  67 #ifdef HAVE_MINGW
  68                                 {
  69                                         const char *messages[] = {message};
  70                                         ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
  71                                 }
  72 #else
  73 #ifdef HAVE_SYSLOG_H
  74                                 syslog(priority, "%s", message);
  75 #endif
  76 #endif
  77                                 break;
  78                         case LOGMODE_NULL:
  79                                 break;
  80                 }
  81         }
  82
  83         if(logcontrol) {
  84                 suppress = true;
  85                 logcontrol = false;
  86                 for list_each(connection_t, c, connection_list) {
  87                         if(!c->status.log)
  88                                 continue;
  89                         logcontrol = true;
  90                         if(level > (c->outcompression >= 0 ? c->outcompression : debug_level))
  91                                 continue;
  92                         int len = strlen(message);
  93                         if(send_request(c, "%d %d %d", CONTROL, REQ_LOG, len))
  94                                 send_meta(c, message, len);
  95                 }
  96                 suppress = false;
  97         }
  98 }
  99
 100 void logger(int level, int priority, const char *format, ...) {
 101         va_list ap;
 102         char message[1024] = "";
 103
 104         va_start(ap, format);
 105         int len = vsnprintf(message, sizeof message, format, ap);
 106         va_end(ap);
 107
 108         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
 109                 message[len - 1] = 0;
 110
 111         real_logger(level, priority, message);
 112 }
 113
 114 static void sptps_logger(sptps_t *s, int s_errno, const char *format, va_list ap) {
 115         char message[1024] = "";
 116         int len = vsnprintf(message, sizeof message, format, ap);
 117         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
 118                 message[len - 1] = 0;
 119
 120         real_logger(DEBUG_ALWAYS, LOG_ERR, message);
 121 }
 122
 123 void openlogger(const char *ident, logmode_t mode) {
 124         logident = ident;
 125         logmode = mode;
 126
 127         switch(mode) {
 128                 case LOGMODE_STDERR:
 129                         logpid = getpid();
 130                         break;
 131                 case LOGMODE_FILE:
 132                         logpid = getpid();
 133                         logfile = fopen(logfilename, "a");
 134                         if(!logfile) {
 135                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 136                                 logmode = LOGMODE_NULL;
 137                         }
 138                         break;
 139                 case LOGMODE_SYSLOG:
 140 #ifdef HAVE_MINGW
 141                         loghandle = RegisterEventSource(NULL, logident);
 142                         if(!loghandle) {
 143                                 fprintf(stderr, "Could not open log handle!");
 144                                 logmode = LOGMODE_NULL;
 145                         }
 146                         break;
 147 #else
 148 #ifdef HAVE_SYSLOG_H
 149                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
 150                         break;
 151 #endif
 152 #endif
 153                 case LOGMODE_NULL:
 154                         break;
 155         }
 156
 157         if(logmode != LOGMODE_NULL)
 158                 sptps_log = sptps_logger;
 159         else
 160                 sptps_log = sptps_log_quiet;
 161 }
 162
 163 void reopenlogger() {
 164         if(logmode != LOGMODE_FILE)
 165                 return;
 166
 167         fflush(logfile);
 168         FILE *newfile = fopen(logfilename, "a");
 169         if(!newfile) {
 170                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
 171                 return;
 172         }
 173         fclose(logfile);
 174         logfile = newfile;
 175 }
 176
 177
 178 void closelogger(void) {
 179         switch(logmode) {
 180                 case LOGMODE_FILE:
 181                         fclose(logfile);
 182                         break;
 183                 case LOGMODE_SYSLOG:
 184 #ifdef HAVE_MINGW
 185                         DeregisterEventSource(loghandle);
 186                         break;
 187 #else
 188 #ifdef HAVE_SYSLOG_H
 189                         closelog();
 190                         break;
 191 #endif
 192 #endif
 193                 case LOGMODE_NULL:
 194                 case LOGMODE_STDERR:
 195                         break;
 196                         break;
 197         }
 198 }