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

   1 /*
   2     logger.c -- logging code
   3     Copyright (C) 2004-2017 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 "process.h"
  30 #include "sptps.h"
  31
  32 int debug_level = DEBUG_NOTHING;
  33 static logmode_t logmode = LOGMODE_STDERR;
  34 static pid_t logpid;
  35 static FILE *logfile = NULL;
  36 #ifdef HAVE_MINGW
  37 static HANDLE loghandle = NULL;
  38 #endif
  39 static const char *logident = NULL;
  40 bool logcontrol = false;
  41 int umbilical = 0;
  42
  43 static void real_logger(int level, int priority, const char *message) {
  44         char timestr[32] = "";
  45         static bool suppress = false;
  46
  47         // Bail out early if there is nothing to do.
  48         if(suppress)
  49                 return;
  50
  51         if(!logcontrol && (level > debug_level || logmode == LOGMODE_NULL))
  52                 return;
  53
  54         if(level <= debug_level) {
  55                 switch(logmode) {
  56                         case LOGMODE_STDERR:
  57                                 fprintf(stderr, "%s\n", message);
  58                                 fflush(stderr);
  59                                 break;
  60                         case LOGMODE_FILE:
  61                                 if(!now.tv_sec)
  62                                         gettimeofday(&now, NULL);
  63                                 time_t now_sec = now.tv_sec;
  64                                 strftime(timestr, sizeof(timestr), "%Y-%m-%d %H:%M:%S", localtime(&now_sec));
  65                                 fprintf(logfile, "%s %s[%ld]: %s\n", timestr, logident, (long)logpid, message);
  66                                 fflush(logfile);
  67                                 break;
  68                         case LOGMODE_SYSLOG:
  69 #ifdef HAVE_MINGW
  70                                 {
  71                                         const char *messages[] = {message};
  72                                         ReportEvent(loghandle, priority, 0, 0, NULL, 1, 0, messages, NULL);
  73                                 }
  74 #else
  75 #ifdef HAVE_SYSLOG_H
  76                                 syslog(priority, "%s", message);
  77 #endif
  78 #endif
  79                                 break;
  80                         case LOGMODE_NULL:
  81                                 break;
  82                 }
  83
  84                 if(umbilical && do_detach) {
  85                         write(umbilical, message, strlen(message));
  86                         write(umbilical, "\n", 1);
  87                 }
  88         }
  89
  90         if(logcontrol) {
  91                 suppress = true;
  92                 logcontrol = false;
  93                 for list_each(connection_t, c, connection_list) {
  94                         if(!c->status.log)
  95                                 continue;
  96                         logcontrol = true;
  97                         if(level > (c->outcompression >= 0 ? c->outcompression : debug_level))
  98                                 continue;
  99                         int len = strlen(message);
 100                         if(send_request(c, "%d %d %d", CONTROL, REQ_LOG, len))
 101                                 send_meta(c, message, len);
 102                 }
 103                 suppress = false;
 104         }
 105 }
 106
 107 void logger(int level, int priority, const char *format, ...) {
 108         va_list ap;
 109         char message[1024] = "";
 110
 111         va_start(ap, format);
 112         int len = vsnprintf(message, sizeof(message), format, ap);
 113         message[sizeof(message) - 1] = 0;
 114         va_end(ap);
 115
 116         if(len > 0 && len < sizeof(message) - 1 && message[len - 1] == '\n')
 117                 message[len - 1] = 0;
 118
 119         real_logger(level, priority, message);
 120 }
 121
 122 static void sptps_logger(sptps_t *s, int s_errno, const char *format, va_list ap) {
 123         char message[1024];
 124         size_t msglen = sizeof(message);
 125
 126         int len = vsnprintf(message, msglen, format, ap);
 127         message[sizeof(message) - 1] = 0;
 128         if(len > 0 && len < sizeof(message) - 1) {
 129                 if(message[len - 1] == '\n')
 130                         message[--len] = 0;
 131
 132                 // WARNING: s->handle can point to a connection_t or a node_t,
 133                 // but both types have the name and hostname fields at the same offsets.
 134                 connection_t *c = s->handle;
 135                 if(c)
 136                         snprintf(message + len, sizeof(message) - len, " from %s (%s)", c->name, c->hostname);
 137         }
 138
 139         real_logger(DEBUG_ALWAYS, LOG_ERR, message);
 140 }
 141
 142 void openlogger(const char *ident, logmode_t mode) {
 143         logident = ident;
 144         logmode = mode;
 145
 146         switch(mode) {
 147                 case LOGMODE_STDERR:
 148                         logpid = getpid();
 149                         break;
 150                 case LOGMODE_FILE:
 151                         logpid = getpid();
 152                         logfile = fopen(logfilename, "a");
 153                         if(!logfile) {
 154                                 fprintf(stderr, "Could not open log file %s: %s\n", logfilename, strerror(errno));
 155                                 logmode = LOGMODE_NULL;
 156                         }
 157                         break;
 158                 case LOGMODE_SYSLOG:
 159 #ifdef HAVE_MINGW
 160                         loghandle = RegisterEventSource(NULL, logident);
 161                         if(!loghandle) {
 162                                 fprintf(stderr, "Could not open log handle!");
 163                                 logmode = LOGMODE_NULL;
 164                         }
 165                         break;
 166 #else
 167 #ifdef HAVE_SYSLOG_H
 168                         openlog(logident, LOG_CONS | LOG_PID, LOG_DAEMON);
 169                         break;
 170 #endif
 171 #endif
 172                 case LOGMODE_NULL:
 173                         break;
 174         }
 175
 176         if(logmode != LOGMODE_NULL)
 177                 sptps_log = sptps_logger;
 178         else
 179                 sptps_log = sptps_log_quiet;
 180 }
 181
 182 void reopenlogger() {
 183         if(logmode != LOGMODE_FILE)
 184                 return;
 185
 186         fflush(logfile);
 187         FILE *newfile = fopen(logfilename, "a");
 188         if(!newfile) {
 189                 logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reopen log file %s: %s", logfilename, strerror(errno));
 190                 return;
 191         }
 192         fclose(logfile);
 193         logfile = newfile;
 194 }
 195
 196
 197 void closelogger(void) {
 198         switch(logmode) {
 199                 case LOGMODE_FILE:
 200                         fclose(logfile);
 201                         break;
 202                 case LOGMODE_SYSLOG:
 203 #ifdef HAVE_MINGW
 204                         DeregisterEventSource(loghandle);
 205                         break;
 206 #else
 207 #ifdef HAVE_SYSLOG_H
 208                         closelog();
 209                         break;
 210 #endif
 211 #endif
 212                 case LOGMODE_NULL:
 213                 case LOGMODE_STDERR:
 214                         break;
 215         }
 216 }