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 int umbilical = 0;
  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                 if(umbilical) {
  84                         write(umbilical, message, strlen(message));
  85                         write(umbilical, "\n", 1);
  86                 }
  87         }
  88
  89         if(logcontrol) {
  90                 suppress = true;
  91                 logcontrol = false;
  92                 for list_each(connection_t, c, connection_list) {
  93                         if(!c->status.log)
  94                                 continue;
  95                         logcontrol = true;
  96                         if(level > (c->outcompression >= 0 ? c->outcompression : debug_level))
  97                                 continue;
  98                         int len = strlen(message);
  99                         if(send_request(c, "%d %d %d", CONTROL, REQ_LOG, len))
 100                                 send_meta(c, message, len);
 101                 }
 102                 suppress = false;
 103         }
 104 }
 105
 106 void logger(int level, int priority, const char *format, ...) {
 107         va_list ap;
 108         char message[1024] = "";
 109
 110         va_start(ap, format);
 111         int len = vsnprintf(message, sizeof message, format, ap);
 112         va_end(ap);
 113
 114         if(len > 0 && len < sizeof message && message[len - 1] == '\n')
 115                 message[len - 1] = 0;
 116
 117         real_logger(level, priority, message);
 118 }
 119
 120 static void sptps_logger(sptps_t *s, int s_errno, const char *format, va_list ap) {
 121         char message[1024] = "";
 122         size_t msglen = sizeof message;
 123
 124         int len = vsnprintf(message, msglen, format, ap);
 125         if(len > 0 && len < sizeof message) {
 126                 if(message[len - 1] == '\n')
 127                         message[--len] = 0;
 128
 129                 connection_t *c = s->handle;
 130                 if(c)
 131                         snprintf(message + len, sizeof message - len, " from %s (%s)", c->name, c->hostname);
 132         }
 133
 134         real_logger(DEBUG_ALWAYS, LOG_ERR, message);
 135 }
 136
 137 void openlogger(const char *ident, logmode_t mode) {
 138         logident = ident;
 139         logmode = mode;
 140
 141         switch(mode) {
 142                 case LOGMODE_STDERR:
 143                         logpid = getpid();
 144                         break;
 145                 case LOGMODE_FILE:
 146                         logpid = getpid();
 147                         logfile = fopen(logfilename, "a");
 148                         if(!logfile) {
 149                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 150                                 logmode = LOGMODE_NULL;
 151                         }
 152                         break;
 153                 case LOGMODE_SYSLOG:
 154 #ifdef HAVE_MINGW
 155                         loghandle = RegisterEventSource(NULL, logident);
 156                         if(!loghandle) {
 157                                 fprintf(stderr, "Could not open log handle!");
 158                                 logmode = LOGMODE_NULL;
 159                         }
 160                         break;
 161 #else
 162 #ifdef HAVE_SYSLOG_H
 163                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
 164                         break;
 165 #endif
 166 #endif
 167                 case LOGMODE_NULL:
 168                         break;
 169         }
 170
 171         if(logmode != LOGMODE_NULL)
 172                 sptps_log = sptps_logger;
 173         else
 174                 sptps_log = sptps_log_quiet;
 175 }
 176
 177 void reopenlogger() {
 178         if(logmode != LOGMODE_FILE)
 179                 return;
 180
 181         fflush(logfile);
 182         FILE *newfile = fopen(logfilename, "a");
 183         if(!newfile) {
 184                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
 185                 return;
 186         }
 187         fclose(logfile);
 188         logfile = newfile;
 189 }
 190
 191
 192 void closelogger(void) {
 193         switch(logmode) {
 194                 case LOGMODE_FILE:
 195                         fclose(logfile);
 196                         break;
 197                 case LOGMODE_SYSLOG:
 198 #ifdef HAVE_MINGW
 199                         DeregisterEventSource(loghandle);
 200                         break;
 201 #else
 202 #ifdef HAVE_SYSLOG_H
 203                         closelog();
 204                         break;
 205 #endif
 206 #endif
 207                 case LOGMODE_NULL:
 208                 case LOGMODE_STDERR:
 209                         break;
 210                         break;
 211         }
 212 }