src/src/tod.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* A function for returning the time of day in various formats */
   9
  10
  11 #include "exim.h"
  12
  13 /* #define TESTING_LOG_DATESTAMP */
  14
  15
  16 static uschar timebuf[sizeof("www, dd-mmm-yyyy hh:mm:ss.ddd +zzzz")];
  17
  18
  19 /*************************************************
  20 *                Return timestamp                *
  21 *************************************************/
  22
  23 /* The log timestamp format is dd-mmm-yy so as to be non-confusing on both
  24 sides of the Atlantic. We calculate an explicit numerical offset from GMT for
  25 the full datestamp and BSD inbox datestamp. Note that on some systems
  26 localtime() and gmtime() re-use the same store, so we must save the local time
  27 values before calling gmtime(). If timestamps_utc is set, don't use
  28 localtime(); all times are then in UTC (with offset +0000).
  29
  30 There are also some contortions to get the day of the month without
  31 a leading zero for the full stamp, since Ustrftime() doesn't provide this
  32 option.
  33
  34 Argument:  type of timestamp required:
  35              tod_bsdin                  BSD inbox format
  36              tod_epoch                  Unix epoch format
  37              tod_epochl                 Unix epoch/usec format
  38              tod_full                   full date and time
  39              tod_log                    log file data line format,
  40                                           with zone if log_timezone is TRUE
  41              tod_log_bare               always without zone
  42              tod_log_datestamp_daily    for log file names when datestamped daily
  43              tod_log_datestamp_monthly  for log file names when datestamped monthly
  44              tod_log_zone               always with zone
  45              tod_mbx                    MBX inbox format
  46              tod_zone                   just the timezone offset
  47              tod_zulu                   time in 8601 zulu format
  48
  49 Returns:   pointer to fixed buffer containing the timestamp
  50 */
  51
  52 uschar *
  53 tod_stamp(int type)
  54 {
  55 struct timeval now;
  56 struct tm * t;
  57
  58 gettimeofday(&now, NULL);
  59
  60 /* Styles that don't need local time */
  61
  62 switch(type)
  63   {
  64   case tod_epoch:
  65     (void) sprintf(CS timebuf, TIME_T_FMT, now.tv_sec);  /* Unix epoch format */
  66     return timebuf;     /* NB the above will be wrong if time_t is FP */
  67
  68   case tod_epoch_l:
  69     /* Unix epoch/usec format */
  70     (void) sprintf(CS timebuf, TIME_T_FMT "%06ld", now.tv_sec, (long) now.tv_usec );
  71     return timebuf;
  72
  73   case tod_zulu:
  74     t = gmtime(&now.tv_sec);
  75     (void) sprintf(CS timebuf, "%04d%02d%02d%02d%02d%02dZ",
  76       1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min,
  77       t->tm_sec);
  78     return timebuf;
  79   }
  80
  81 /* Vary log type according to timezone requirement */
  82
  83 if (type == tod_log) type = log_timezone ? tod_log_zone : tod_log_bare;
  84
  85 /* Convert to local time or UTC */
  86
  87 t = timestamps_utc ? gmtime(&now.tv_sec) : localtime(&now.tv_sec);
  88
  89 switch(type)
  90   {
  91   case tod_log_bare:          /* Format used in logging without timezone */
  92 #ifndef COMPILE_UTILITY
  93     if (LOGGING(millisec))
  94       sprintf(CS timebuf, "%04d-%02d-%02d %02d:%02d:%02d.%03d",
  95       1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday,
  96       t->tm_hour, t->tm_min, t->tm_sec, (int)(now.tv_usec/1000));
  97     else
  98 #endif
  99       sprintf(CS timebuf, "%04d-%02d-%02d %02d:%02d:%02d",
 100       1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday,
 101       t->tm_hour, t->tm_min, t->tm_sec);
 102
 103     break;
 104
 105     /* Format used as suffix of log file name when 'log_datestamp' is active. For
 106     testing purposes, it changes the file every second. */
 107
 108 #ifdef TESTING_LOG_DATESTAMP
 109   case tod_log_datestamp_daily:
 110   case tod_log_datestamp_monthly:
 111     sprintf(CS timebuf, "%04d%02d%02d%02d%02d",
 112       1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min);
 113     break;
 114
 115 #else
 116   case tod_log_datestamp_daily:
 117     sprintf(CS timebuf, "%04d%02d%02d",
 118       1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday);
 119     break;
 120
 121   case tod_log_datestamp_monthly:
 122 #ifndef COMPILE_UTILITY
 123     sprintf(CS timebuf, "%04d%02d",
 124       1900 + t->tm_year, 1 + t->tm_mon);
 125 #endif
 126     break;
 127 #endif
 128
 129     /* Format used in BSD inbox separator lines. Sort-of documented in RFC 976
 130     ("UUCP Mail Interchange Format Standard") but only by example, not by
 131     explicit definition. The examples show no timezone offsets, and some MUAs
 132     appear to be sensitive to this, so Exim has been changed to remove the
 133     timezone offsets that originally appeared. */
 134
 135   case tod_bsdin:
 136       {
 137       int len = Ustrftime(timebuf, sizeof(timebuf), "%a %b %d %H:%M:%S", t);
 138       Ustrftime(timebuf + len, sizeof(timebuf) - len, " %Y", t);
 139       }
 140     break;
 141
 142     /* Other types require the GMT offset to be calculated, or just set up in the
 143     case of UTC timestamping. We need to take a copy of the local time first. */
 144
 145   default:
 146       {
 147       int diff_hour, diff_min;
 148       struct tm local;
 149       memcpy(&local, t, sizeof(struct tm));
 150
 151       if (timestamps_utc)
 152         diff_hour = diff_min = 0;
 153       else
 154         {
 155         struct tm * gmt = gmtime(&now.tv_sec);
 156
 157         diff_min = 60*(local.tm_hour - gmt->tm_hour) + local.tm_min - gmt->tm_min;
 158         if (local.tm_year != gmt->tm_year)
 159           diff_min += (local.tm_year > gmt->tm_year)? 1440 : -1440;
 160         else if (local.tm_yday != gmt->tm_yday)
 161           diff_min += (local.tm_yday > gmt->tm_yday)? 1440 : -1440;
 162         diff_hour = diff_min/60;
 163         diff_min  = abs(diff_min - diff_hour*60);
 164         }
 165
 166       switch(type)
 167         {
 168         case tod_log_zone:          /* Format used in logging with timezone */
 169 #ifndef COMPILE_UTILITY
 170           if (LOGGING(millisec))
 171             (void) sprintf(CS timebuf,
 172               "%04d-%02d-%02d %02d:%02d:%02d.%03d %+03d%02d",
 173               1900 + local.tm_year, 1 + local.tm_mon, local.tm_mday,
 174               local.tm_hour, local.tm_min, local.tm_sec, (int)(now.tv_usec/1000),
 175               diff_hour, diff_min);
 176           else
 177 #endif
 178             (void) sprintf(CS timebuf,
 179               "%04d-%02d-%02d %02d:%02d:%02d %+03d%02d",
 180               1900 + local.tm_year, 1 + local.tm_mon, local.tm_mday,
 181               local.tm_hour, local.tm_min, local.tm_sec,
 182               diff_hour, diff_min);
 183           break;
 184
 185         case tod_zone:              /* Just the timezone offset */
 186           (void) sprintf(CS timebuf, "%+03d%02d", diff_hour, diff_min);
 187           break;
 188
 189         /* tod_mbx: format used in MBX mailboxes - subtly different to tod_full */
 190
 191           #ifdef SUPPORT_MBX
 192         case tod_mbx:
 193             {
 194             int len;
 195             (void) sprintf(CS timebuf, "%02d-", local.tm_mday);
 196             len = Ustrlen(timebuf);
 197             len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b-%Y %H:%M:%S",
 198               &local);
 199             (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);
 200             }
 201           break;
 202           #endif
 203
 204         /* tod_full: format used in Received: headers (use as default just in case
 205         called with a junk type value) */
 206
 207         default:
 208             {
 209             int len = Ustrftime(timebuf, sizeof(timebuf), "%a, ", &local);
 210             (void) sprintf(CS timebuf + len, "%02d ", local.tm_mday);
 211             len += Ustrlen(timebuf + len);
 212             len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b %Y %H:%M:%S",
 213               &local);
 214             (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);
 215             }
 216           break;
 217         }
 218       }
 219     break;
 220   }
 221
 222 return timebuf;
 223 }
 224
 225 /* End of tod.c */