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

   1 /*
   2     logger.c -- logging code
   3     Copyright (C) 2004-2015 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 "control_common.h"
  29 #include "sptps.h"
  30
  31 debug_t debug_level = DEBUG_NOTHING;
  32 static logmode_t logmode = LOGMODE_STDERR;
  33 static pid_t logpid;
  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                                 time_t now_sec = now.tv_sec;
  63                                 strftime(timestr, sizeof timestr, "%Y-%m-%d %H:%M:%S", localtime(&now_sec));
  64                                 fprintf(logfile, "%s %s[%ld]: %s\n", timestr, logident, (long)logpid, message);
  65                                 fflush(logfile);
  66                                 break;
  67                         case LOGMODE_SYSLOG:
  68 #ifdef HAVE_MINGW
  69                                 {
  70                                         const char *messages[] = {message};
  71                                         ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
  72                                 }
  73 #else
  74 #ifdef HAVE_SYSLOG_H
  75                                 syslog(priority, "%s", message);
  76 #endif
  77 #endif
  78                                 break;
  79                         case LOGMODE_NULL:
  80                                 break;
  81                 }
  82         }
  83
  84         if(logcontrol) {
  85                 suppress = true;
  86                 logcontrol = false;
  87                 for list_each(connection_t, c, connection_list) {
  88                         if(!c->status.log)
  89                                 continue;
  90                         logcontrol = true;
  91                         if(level > (c->outcompression >= 0 ? c->outcompression : debug_level))
  92                                 continue;
  93                         int len = strlen(message);
  94                         if(send_request(c, "%d %d %d", CONTROL, REQ_LOG, len))
  95                                 send_meta(c, message, len);
  96                 }
  97                 suppress = false;
  98         }
  99 }
 100
 101 void logger(int level, int priority, const char *format, ...) {
 102         va_list ap;
 103         char message[1024] = "";
 104
 105         va_start(ap, format);
 106         int len = vsnprintf(message, sizeof message, format, ap);
 107         va_end(ap);
 108
 109         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
 110                 message[len - 1] = 0;
 111
 112         real_logger(level, priority, message);
 113 }
 114
 115 static void sptps_logger(sptps_t *s, int s_errno, const char *format, va_list ap) {
 116         char message[1024] = "";
 117         size_t msglen = sizeof message;
 118
 119         int len = vsnprintf(message, msglen, format, ap);
 120         if(len > 0 && len < sizeof message) {
 121                 if(message[len - 1] == '\n')
 122                         message[--len] = 0;
 123
 124                 connection_t *c = s->handle;
 125                 if(c)
 126                         snprintf(message + len, sizeof message - len, " from %s (%s)", c->name, c->hostname);
 127         }
 128
 129         real_logger(DEBUG_ALWAYS, LOG_ERR, message);
 130 }
 131
 132 void openlogger(const char *ident, logmode_t mode) {
 133         logident = ident;
 134         logmode = mode;
 135
 136         switch(mode) {
 137                 case LOGMODE_STDERR:
 138                         logpid = getpid();
 139                         break;
 140                 case LOGMODE_FILE:
 141                         logpid = getpid();
 142                         logfile = fopen(logfilename, "a");
 143                         if(!logfile) {
 144                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 145                                 logmode = LOGMODE_NULL;
 146                         }
 147                         break;
 148                 case LOGMODE_SYSLOG:
 149 #ifdef HAVE_MINGW
 150                         loghandle = RegisterEventSource(NULL, logident);
 151                         if(!loghandle) {
 152                                 fprintf(stderr, "Could not open log handle!");
 153                                 logmode = LOGMODE_NULL;
 154                         }
 155                         break;
 156 #else
 157 #ifdef HAVE_SYSLOG_H
 158                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
 159                         break;
 160 #endif
 161 #endif
 162                 case LOGMODE_NULL:
 163                         break;
 164         }
 165
 166         if(logmode != LOGMODE_NULL)
 167                 sptps_log = sptps_logger;
 168         else
 169                 sptps_log = sptps_log_quiet;
 170 }
 171
 172 void reopenlogger() {
 173         if(logmode != LOGMODE_FILE)
 174                 return;
 175
 176         fflush(logfile);
 177         FILE *newfile = fopen(logfilename, "a");
 178         if(!newfile) {
 179                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
 180                 return;
 181         }
 182         fclose(logfile);
 183         logfile = newfile;
 184 }
 185
 186
 187 void closelogger(void) {
 188         switch(logmode) {
 189                 case LOGMODE_FILE:
 190                         fclose(logfile);
 191                         break;
 192                 case LOGMODE_SYSLOG:
 193 #ifdef HAVE_MINGW
 194                         DeregisterEventSource(loghandle);
 195                         break;
 196 #else
 197 #ifdef HAVE_SYSLOG_H
 198                         closelog();
 199                         break;
 200 #endif
 201 #endif
 202                 case LOGMODE_NULL:
 203                 case LOGMODE_STDERR:
 204                         break;
 205                         break;
 206         }
 207 }