1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* A function for returning the time of day in various formats */
13 /* #define TESTING_LOG_DATESTAMP */
16 static uschar timebuf[sizeof("www, dd-mmm-yyyy hh:mm:ss.ddd +zzzz")];
19 /*************************************************
21 *************************************************/
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).
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
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
49 Returns: pointer to fixed buffer containing the timestamp
59 gettimeofday(&now, NULL);
61 /* Styles that don't need local time */
66 (void) sprintf(CS timebuf, TIME_T_FMT, now.tv_sec); /* Unix epoch format */
67 return timebuf; /* NB the above will be wrong if time_t is FP */
70 /* Unix epoch/usec format */
71 (void) sprintf(CS timebuf, TIME_T_FMT "%06ld", now.tv_sec, (long) now.tv_usec );
75 t = gmtime(&now.tv_sec);
76 (void) sprintf(CS timebuf, "%04d%02d%02d%02d%02d%02dZ",
77 1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min,
82 /* Vary log type according to timezone requirement */
84 if (type == tod_log) type = log_timezone ? tod_log_zone : tod_log_bare;
86 /* Convert to local time or UTC */
88 t = timestamps_utc ? gmtime(&now.tv_sec) : localtime(&now.tv_sec);
92 case tod_log_bare: /* Format used in logging without timezone */
93 off = sprintf(CS timebuf, "%04d-%02d-%02d %02d:%02d:%02d",
94 1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday,
95 t->tm_hour, t->tm_min, t->tm_sec);
98 /* Format used as suffix of log file name when 'log_datestamp' is active. For
99 testing purposes, it changes the file every second. */
101 #ifdef TESTING_LOG_DATESTAMP
102 case tod_log_datestamp_daily:
103 case tod_log_datestamp_monthly:
104 off = sprintf(CS timebuf, "%04d%02d%02d%02d%02d",
105 1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday, t->tm_hour, t->tm_min);
109 case tod_log_datestamp_daily:
110 off = sprintf(CS timebuf, "%04d%02d%02d",
111 1900 + t->tm_year, 1 + t->tm_mon, t->tm_mday);
114 case tod_log_datestamp_monthly:
115 #ifndef COMPILE_UTILITY
116 off = sprintf(CS timebuf, "%04d%02d",
117 1900 + t->tm_year, 1 + t->tm_mon);
122 /* Format used in BSD inbox separator lines. Sort-of documented in RFC 976
123 ("UUCP Mail Interchange Format Standard") but only by example, not by
124 explicit definition. The examples show no timezone offsets, and some MUAs
125 appear to be sensitive to this, so Exim has been changed to remove the
126 timezone offsets that originally appeared. */
130 int len = Ustrftime(timebuf, sizeof(timebuf), "%a %b %d %H:%M:%S", t);
131 Ustrftime(timebuf + len, sizeof(timebuf) - len, " %Y", t);
135 /* Other types require the GMT offset to be calculated, or just set up in the
136 case of UTC timestamping. We need to take a copy of the local time first. */
140 int diff_hour, diff_min;
142 memcpy(&local, t, sizeof(struct tm));
145 diff_hour = diff_min = 0;
148 struct tm * gmt = gmtime(&now.tv_sec);
150 diff_min = 60*(local.tm_hour - gmt->tm_hour) + local.tm_min - gmt->tm_min;
151 if (local.tm_year != gmt->tm_year)
152 diff_min += (local.tm_year > gmt->tm_year)? 1440 : -1440;
153 else if (local.tm_yday != gmt->tm_yday)
154 diff_min += (local.tm_yday > gmt->tm_yday)? 1440 : -1440;
155 diff_hour = diff_min/60;
156 diff_min = abs(diff_min - diff_hour*60);
161 case tod_log_zone: /* Format used in logging with timezone */
162 #ifndef COMPILE_UTILITY
163 if (LOGGING(millisec))
164 (void) sprintf(CS timebuf,
165 "%04d-%02d-%02d %02d:%02d:%02d.%03d %+03d%02d",
166 1900 + local.tm_year, 1 + local.tm_mon, local.tm_mday,
167 local.tm_hour, local.tm_min, local.tm_sec, (int)(now.tv_usec/1000),
168 diff_hour, diff_min);
171 (void) sprintf(CS timebuf,
172 "%04d-%02d-%02d %02d:%02d:%02d %+03d%02d",
173 1900 + local.tm_year, 1 + local.tm_mon, local.tm_mday,
174 local.tm_hour, local.tm_min, local.tm_sec,
175 diff_hour, diff_min);
178 case tod_zone: /* Just the timezone offset */
179 (void) sprintf(CS timebuf, "%+03d%02d", diff_hour, diff_min);
182 /* tod_mbx: format used in MBX mailboxes - subtly different to tod_full */
188 (void) sprintf(CS timebuf, "%02d-", local.tm_mday);
189 len = Ustrlen(timebuf);
190 len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b-%Y %H:%M:%S",
192 (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);
197 /* tod_full: format used in Received: headers (use as default just in case
198 called with a junk type value) */
202 int len = Ustrftime(timebuf, sizeof(timebuf), "%a, ", &local);
203 (void) sprintf(CS timebuf + len, "%02d ", local.tm_mday);
204 len += Ustrlen(timebuf + len);
205 len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b %Y %H:%M:%S",
207 (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);
215 #ifndef COMPILE_UTILITY
216 if (LOGGING(millisec) && off > 0)
217 (void) sprintf(CS timebuf + off, ".%03d", (int)(now.tv_usec/1000));
219 off = off; /* Compiler quietening */