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) snprintf(CS timebuf, sizeof(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) snprintf(CS timebuf, sizeof(timebuf), TIME_T_FMT "%06ld", now.tv_sec, (long) now.tv_usec );
74 t = gmtime(&now.tv_sec);
75 (void) snprintf(CS timebuf, sizeof(timebuf), "%04u%02u%02u%02u%02u%02uZ",
76 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon, (uint)t->tm_mday, (uint)t->tm_hour, (uint)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 = f.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 snprintf(CS timebuf, sizeof(timebuf), "%04u-%02u-%02u %02u:%02u:%02u.%03u",
95 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon, (uint)t->tm_mday,
96 (uint)t->tm_hour, (uint)t->tm_min, (uint)t->tm_sec,
97 (uint)(now.tv_usec/1000));
100 snprintf(CS timebuf, sizeof(timebuf), "%04u-%02u-%02u %02u:%02u:%02u",
101 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon, (uint)t->tm_mday,
102 (uint)t->tm_hour, (uint)t->tm_min, (uint)t->tm_sec);
106 /* Format used as suffix of log file name when 'log_datestamp' is active. For
107 testing purposes, it changes the file every second. */
109 #ifdef TESTING_LOG_DATESTAMP
110 case tod_log_datestamp_daily:
111 case tod_log_datestamp_monthly:
112 snprintf(CS timebuf, sizeof(timebuf), "%04u%02u%02u%02u%02u",
113 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon, (uint)t->tm_mday,
114 (uint)t->tm_hour, (uint)t->tm_min);
118 case tod_log_datestamp_daily:
119 snprintf(CS timebuf, sizeof(timebuf), "%04u%02u%02u",
120 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon, (uint)t->tm_mday);
123 case tod_log_datestamp_monthly:
124 #ifndef COMPILE_UTILITY
125 snprintf(CS timebuf, sizeof(timebuf), "%04u%02u",
126 1900 + (uint)t->tm_year, 1 + (uint)t->tm_mon);
131 /* Format used in BSD inbox separator lines. Sort-of documented in RFC 976
132 ("UUCP Mail Interchange Format Standard") but only by example, not by
133 explicit definition. The examples show no timezone offsets, and some MUAs
134 appear to be sensitive to this, so Exim has been changed to remove the
135 timezone offsets that originally appeared. */
139 int len = Ustrftime(timebuf, sizeof(timebuf), "%a %b %d %H:%M:%S", t);
140 Ustrftime(timebuf + len, sizeof(timebuf) - len, " %Y", t);
144 /* Other types require the GMT offset to be calculated, or just set up in the
145 case of UTC timestamping. We need to take a copy of the local time first. */
149 int diff_hour, diff_min;
151 memcpy(&local, t, sizeof(struct tm));
153 if (f.timestamps_utc)
154 diff_hour = diff_min = 0;
157 struct tm * gmt = gmtime(&now.tv_sec);
159 diff_min = 60*(local.tm_hour - gmt->tm_hour) + local.tm_min - gmt->tm_min;
160 if (local.tm_year != gmt->tm_year)
161 diff_min += (local.tm_year > gmt->tm_year)? 1440 : -1440;
162 else if (local.tm_yday != gmt->tm_yday)
163 diff_min += (local.tm_yday > gmt->tm_yday)? 1440 : -1440;
164 diff_hour = diff_min/60;
165 diff_min = abs(diff_min - diff_hour*60);
170 case tod_log_zone: /* Format used in logging with timezone */
171 #ifndef COMPILE_UTILITY
172 if (LOGGING(millisec))
173 (void) snprintf(CS timebuf, sizeof(timebuf),
174 "%04u-%02u-%02u %02u:%02u:%02u.%03u %+03d%02d",
175 1900 + (uint)local.tm_year, 1 + (uint)local.tm_mon, (uint)local.tm_mday,
176 (uint)local.tm_hour, (uint)local.tm_min, (uint)local.tm_sec, (uint)(now.tv_usec/1000),
177 diff_hour, diff_min);
180 (void) snprintf(CS timebuf, sizeof(timebuf),
181 "%04u-%02u-%02u %02u:%02u:%02u %+03d%02d",
182 1900 + (uint)local.tm_year, 1 + (uint)local.tm_mon, (uint)local.tm_mday,
183 (uint)local.tm_hour, (uint)local.tm_min, (uint)local.tm_sec,
184 diff_hour, diff_min);
187 case tod_zone: /* Just the timezone offset */
188 (void) snprintf(CS timebuf, sizeof(timebuf), "%+03d%02d", diff_hour, diff_min);
191 /* tod_mbx: format used in MBX mailboxes - subtly different to tod_full */
197 (void) snprintf(CS timebuf, sizeof(timebuf), "%02u-", (uint)local.tm_mday);
198 len = Ustrlen(timebuf);
199 len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b-%Y %H:%M:%S",
201 (void) snprintf(CS timebuf + len, sizeof(timebuf)-len, " %+03d%02d", diff_hour, diff_min);
206 /* tod_full: format used in Received: headers (use as default just in case
207 called with a junk type value) */
211 int len = Ustrftime(timebuf, sizeof(timebuf), "%a, ", &local);
212 (void) snprintf(CS timebuf + len, sizeof(timebuf)-len, "%02u ", (uint)local.tm_mday);
213 len += Ustrlen(timebuf + len);
214 len += Ustrftime(timebuf + len, sizeof(timebuf) - len, "%b %Y %H:%M:%S",
216 (void) snprintf(CS timebuf + len, sizeof(timebuf)-len, " %+03d%02d", diff_hour, diff_min);