1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
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
58 gettimeofday(&now, NULL);
60 /* Styles that don't need local time */
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 */
69 /* Unix epoch/usec format */
70 (void) sprintf(CS timebuf, TIME_T_FMT "%06ld", now.tv_sec, (long) now.tv_usec );
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,
81 /* Vary log type according to timezone requirement */
83 if (type == tod_log) type = log_timezone ? tod_log_zone : tod_log_bare;
85 /* Convert to local time or UTC */
87 t = timestamps_utc ? gmtime(&now.tv_sec) : localtime(&now.tv_sec);
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));
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);
105 /* Format used as suffix of log file name when 'log_datestamp' is active. For
106 testing purposes, it changes the file every second. */
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);
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);
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);
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. */
137 int len = Ustrftime(timebuf, sizeof(timebuf), "%a %b %d %H:%M:%S", t);
138 Ustrftime(timebuf + len, sizeof(timebuf) - len, " %Y", t);
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. */
147 int diff_hour, diff_min;
149 memcpy(&local, t, sizeof(struct tm));
152 diff_hour = diff_min = 0;
155 struct tm * gmt = gmtime(&now.tv_sec);
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);
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);
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);
185 case tod_zone: /* Just the timezone offset */
186 (void) sprintf(CS timebuf, "%+03d%02d", diff_hour, diff_min);
189 /* tod_mbx: format used in MBX mailboxes - subtly different to tod_full */
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",
199 (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);
204 /* tod_full: format used in Received: headers (use as default just in case
205 called with a junk type value) */
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",
214 (void) sprintf(CS timebuf + len, " %+03d%02d", diff_hour, diff_min);