/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #include #include #include #include "alloc-util.h" #include "fd-util.h" #include "fileio.h" #include "fs-util.h" #include "io-util.h" #include "log.h" #include "macro.h" #include "missing_timerfd.h" #include "parse-util.h" #include "path-util.h" #include "process-util.h" #include "stat-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "time-util.h" static clockid_t map_clock_id(clockid_t c) { /* Some more exotic archs (s390, ppc, …) lack the "ALARM" flavour of the clocks. Thus, clock_gettime() will * fail for them. Since they are essentially the same as their non-ALARM pendants (their only difference is * when timers are set on them), let's just map them accordingly. This way, we can get the correct time even on * those archs. */ switch (c) { case CLOCK_BOOTTIME_ALARM: return CLOCK_BOOTTIME; case CLOCK_REALTIME_ALARM: return CLOCK_REALTIME; default: return c; } } usec_t now(clockid_t clock_id) { struct timespec ts; assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0); return timespec_load(&ts); } nsec_t now_nsec(clockid_t clock_id) { struct timespec ts; assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0); return timespec_load_nsec(&ts); } dual_timestamp* dual_timestamp_get(dual_timestamp *ts) { assert(ts); ts->realtime = now(CLOCK_REALTIME); ts->monotonic = now(CLOCK_MONOTONIC); return ts; } triple_timestamp* triple_timestamp_get(triple_timestamp *ts) { assert(ts); ts->realtime = now(CLOCK_REALTIME); ts->monotonic = now(CLOCK_MONOTONIC); ts->boottime = clock_boottime_supported() ? now(CLOCK_BOOTTIME) : USEC_INFINITY; return ts; } static usec_t map_clock_usec_internal(usec_t from, usec_t from_base, usec_t to_base) { /* Maps the time 'from' between two clocks, based on a common reference point where the first clock * is at 'from_base' and the second clock at 'to_base'. Basically calculates: * * from - from_base + to_base * * But takes care of overflows/underflows and avoids signed operations. */ if (from >= from_base) { /* In the future */ usec_t delta = from - from_base; if (to_base >= USEC_INFINITY - delta) /* overflow? */ return USEC_INFINITY; return to_base + delta; } else { /* In the past */ usec_t delta = from_base - from; if (to_base <= delta) /* underflow? */ return 0; return to_base - delta; } } usec_t map_clock_usec(usec_t from, clockid_t from_clock, clockid_t to_clock) { /* Try to avoid any inaccuracy needlessly added in case we convert from effectively the same clock * onto itself */ if (map_clock_id(from_clock) == map_clock_id(to_clock)) return from; /* Keep infinity as is */ if (from == USEC_INFINITY) return from; return map_clock_usec_internal(from, now(from_clock), now(to_clock)); } dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) { assert(ts); if (u == USEC_INFINITY || u == 0) { ts->realtime = ts->monotonic = u; return ts; } ts->realtime = u; ts->monotonic = map_clock_usec(u, CLOCK_REALTIME, CLOCK_MONOTONIC); return ts; } triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u) { usec_t nowr; assert(ts); if (u == USEC_INFINITY || u == 0) { ts->realtime = ts->monotonic = ts->boottime = u; return ts; } nowr = now(CLOCK_REALTIME); ts->realtime = u; ts->monotonic = map_clock_usec_internal(u, nowr, now(CLOCK_MONOTONIC)); ts->boottime = clock_boottime_supported() ? map_clock_usec_internal(u, nowr, now(CLOCK_BOOTTIME)) : USEC_INFINITY; return ts; } dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) { assert(ts); if (u == USEC_INFINITY) { ts->realtime = ts->monotonic = USEC_INFINITY; return ts; } ts->monotonic = u; ts->realtime = map_clock_usec(u, CLOCK_MONOTONIC, CLOCK_REALTIME); return ts; } dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u) { clockid_t cid; usec_t nowm; if (u == USEC_INFINITY) { ts->realtime = ts->monotonic = USEC_INFINITY; return ts; } cid = clock_boottime_or_monotonic(); nowm = now(cid); if (cid == CLOCK_MONOTONIC) ts->monotonic = u; else ts->monotonic = map_clock_usec_internal(u, nowm, now(CLOCK_MONOTONIC)); ts->realtime = map_clock_usec_internal(u, nowm, now(CLOCK_REALTIME)); return ts; } usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock) { switch (clock) { case CLOCK_REALTIME: case CLOCK_REALTIME_ALARM: return ts->realtime; case CLOCK_MONOTONIC: return ts->monotonic; case CLOCK_BOOTTIME: case CLOCK_BOOTTIME_ALARM: return ts->boottime; default: return USEC_INFINITY; } } usec_t timespec_load(const struct timespec *ts) { assert(ts); if (ts->tv_sec < 0 || ts->tv_nsec < 0) return USEC_INFINITY; if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC) return USEC_INFINITY; return (usec_t) ts->tv_sec * USEC_PER_SEC + (usec_t) ts->tv_nsec / NSEC_PER_USEC; } nsec_t timespec_load_nsec(const struct timespec *ts) { assert(ts); if (ts->tv_sec < 0 || ts->tv_nsec < 0) return NSEC_INFINITY; if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC) return NSEC_INFINITY; return (nsec_t) ts->tv_sec * NSEC_PER_SEC + (nsec_t) ts->tv_nsec; } struct timespec *timespec_store(struct timespec *ts, usec_t u) { assert(ts); if (u == USEC_INFINITY || u / USEC_PER_SEC >= TIME_T_MAX) { ts->tv_sec = (time_t) -1; ts->tv_nsec = -1L; return ts; } ts->tv_sec = (time_t) (u / USEC_PER_SEC); ts->tv_nsec = (long) ((u % USEC_PER_SEC) * NSEC_PER_USEC); return ts; } struct timespec *timespec_store_nsec(struct timespec *ts, nsec_t n) { assert(ts); if (n == NSEC_INFINITY || n / NSEC_PER_SEC >= TIME_T_MAX) { ts->tv_sec = (time_t) -1; ts->tv_nsec = -1L; return ts; } ts->tv_sec = (time_t) (n / NSEC_PER_SEC); ts->tv_nsec = (long) (n % NSEC_PER_SEC); return ts; } usec_t timeval_load(const struct timeval *tv) { assert(tv); if (tv->tv_sec < 0 || tv->tv_usec < 0) return USEC_INFINITY; if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC) return USEC_INFINITY; return (usec_t) tv->tv_sec * USEC_PER_SEC + (usec_t) tv->tv_usec; } struct timeval *timeval_store(struct timeval *tv, usec_t u) { assert(tv); if (u == USEC_INFINITY || u / USEC_PER_SEC > TIME_T_MAX) { tv->tv_sec = (time_t) -1; tv->tv_usec = (suseconds_t) -1; } else { tv->tv_sec = (time_t) (u / USEC_PER_SEC); tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC); } return tv; } char *format_timestamp_style( char *buf, size_t l, usec_t t, TimestampStyle style) { /* The weekdays in non-localized (English) form. We use this instead of the localized form, so that our * generated timestamps may be parsed with parse_timestamp(), and always read the same. */ static const char * const weekdays[] = { [0] = "Sun", [1] = "Mon", [2] = "Tue", [3] = "Wed", [4] = "Thu", [5] = "Fri", [6] = "Sat", }; struct tm tm; time_t sec; size_t n; bool utc = false, us = false; assert(buf); switch (style) { case TIMESTAMP_PRETTY: break; case TIMESTAMP_US: us = true; break; case TIMESTAMP_UTC: utc = true; break; case TIMESTAMP_US_UTC: us = true; utc = true; break; default: return NULL; } if (l < (size_t) (3 + /* week day */ 1 + 10 + /* space and date */ 1 + 8 + /* space and time */ (us ? 1 + 6 : 0) + /* "." and microsecond part */ 1 + 1 + /* space and shortest possible zone */ 1)) return NULL; /* Not enough space even for the shortest form. */ if (t <= 0 || t == USEC_INFINITY) return NULL; /* Timestamp is unset */ /* Let's not format times with years > 9999 */ if (t > USEC_TIMESTAMP_FORMATTABLE_MAX) { assert(l >= STRLEN("--- XXXX-XX-XX XX:XX:XX") + 1); strcpy(buf, "--- XXXX-XX-XX XX:XX:XX"); return buf; } sec = (time_t) (t / USEC_PER_SEC); /* Round down */ if (!localtime_or_gmtime_r(&sec, &tm, utc)) return NULL; /* Start with the week day */ assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays)); memcpy(buf, weekdays[tm.tm_wday], 4); /* Add the main components */ if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0) return NULL; /* Doesn't fit */ /* Append the microseconds part, if that's requested */ if (us) { n = strlen(buf); if (n + 8 > l) return NULL; /* Microseconds part doesn't fit. */ sprintf(buf + n, ".%06"PRI_USEC, t % USEC_PER_SEC); } /* Append the timezone */ n = strlen(buf); if (utc) { /* If this is UTC then let's explicitly use the "UTC" string here, because gmtime_r() normally uses the * obsolete "GMT" instead. */ if (n + 5 > l) return NULL; /* "UTC" doesn't fit. */ strcpy(buf + n, " UTC"); } else if (!isempty(tm.tm_zone)) { size_t tn; /* An explicit timezone is specified, let's use it, if it fits */ tn = strlen(tm.tm_zone); if (n + 1 + tn + 1 > l) { /* The full time zone does not fit in. Yuck. */ if (n + 1 + _POSIX_TZNAME_MAX + 1 > l) return NULL; /* Not even enough space for the POSIX minimum (of 6)? In that case, complain that it doesn't fit */ /* So the time zone doesn't fit in fully, but the caller passed enough space for the POSIX * minimum time zone length. In this case suppress the timezone entirely, in order not to dump * an overly long, hard to read string on the user. This should be safe, because the user will * assume the local timezone anyway if none is shown. And so does parse_timestamp(). */ } else { buf[n++] = ' '; strcpy(buf + n, tm.tm_zone); } } return buf; } char *format_timestamp_relative(char *buf, size_t l, usec_t t) { const char *s; usec_t n, d; if (t <= 0 || t == USEC_INFINITY) return NULL; n = now(CLOCK_REALTIME); if (n > t) { d = n - t; s = "ago"; } else { d = t - n; s = "left"; } if (d >= USEC_PER_YEAR) { usec_t years = d / USEC_PER_YEAR; usec_t months = (d % USEC_PER_YEAR) / USEC_PER_MONTH; (void) snprintf(buf, l, USEC_FMT " %s " USEC_FMT " %s %s", years, years == 1 ? "year" : "years", months, months == 1 ? "month" : "months", s); } else if (d >= USEC_PER_MONTH) { usec_t months = d / USEC_PER_MONTH; usec_t days = (d % USEC_PER_MONTH) / USEC_PER_DAY; (void) snprintf(buf, l, USEC_FMT " %s " USEC_FMT " %s %s", months, months == 1 ? "month" : "months", days, days == 1 ? "day" : "days", s); } else if (d >= USEC_PER_WEEK) { usec_t weeks = d / USEC_PER_WEEK; usec_t days = (d % USEC_PER_WEEK) / USEC_PER_DAY; (void) snprintf(buf, l, USEC_FMT " %s " USEC_FMT " %s %s", weeks, weeks == 1 ? "week" : "weeks", days, days == 1 ? "day" : "days", s); } else if (d >= 2*USEC_PER_DAY) (void) snprintf(buf, l, USEC_FMT " days %s", d / USEC_PER_DAY, s); else if (d >= 25*USEC_PER_HOUR) (void) snprintf(buf, l, "1 day " USEC_FMT "h %s", (d - USEC_PER_DAY) / USEC_PER_HOUR, s); else if (d >= 6*USEC_PER_HOUR) (void) snprintf(buf, l, USEC_FMT "h %s", d / USEC_PER_HOUR, s); else if (d >= USEC_PER_HOUR) (void) snprintf(buf, l, USEC_FMT "h " USEC_FMT "min %s", d / USEC_PER_HOUR, (d % USEC_PER_HOUR) / USEC_PER_MINUTE, s); else if (d >= 5*USEC_PER_MINUTE) (void) snprintf(buf, l, USEC_FMT "min %s", d / USEC_PER_MINUTE, s); else if (d >= USEC_PER_MINUTE) (void) snprintf(buf, l, USEC_FMT "min " USEC_FMT "s %s", d / USEC_PER_MINUTE, (d % USEC_PER_MINUTE) / USEC_PER_SEC, s); else if (d >= USEC_PER_SEC) (void) snprintf(buf, l, USEC_FMT "s %s", d / USEC_PER_SEC, s); else if (d >= USEC_PER_MSEC) (void) snprintf(buf, l, USEC_FMT "ms %s", d / USEC_PER_MSEC, s); else if (d > 0) (void) snprintf(buf, l, USEC_FMT"us %s", d, s); else (void) snprintf(buf, l, "now"); buf[l-1] = 0; return buf; } char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) { static const struct { const char *suffix; usec_t usec; } table[] = { { "y", USEC_PER_YEAR }, { "month", USEC_PER_MONTH }, { "w", USEC_PER_WEEK }, { "d", USEC_PER_DAY }, { "h", USEC_PER_HOUR }, { "min", USEC_PER_MINUTE }, { "s", USEC_PER_SEC }, { "ms", USEC_PER_MSEC }, { "us", 1 }, }; char *p = buf; bool something = false; assert(buf); assert(l > 0); if (t == USEC_INFINITY) { strncpy(p, "infinity", l-1); p[l-1] = 0; return p; } if (t <= 0) { strncpy(p, "0", l-1); p[l-1] = 0; return p; } /* The result of this function can be parsed with parse_sec */ for (size_t i = 0; i < ELEMENTSOF(table); i++) { int k = 0; size_t n; bool done = false; usec_t a, b; if (t <= 0) break; if (t < accuracy && something) break; if (t < table[i].usec) continue; if (l <= 1) break; a = t / table[i].usec; b = t % table[i].usec; /* Let's see if we should shows this in dot notation */ if (t < USEC_PER_MINUTE && b > 0) { signed char j = 0; for (usec_t cc = table[i].usec; cc > 1; cc /= 10) j++; for (usec_t cc = accuracy; cc > 1; cc /= 10) { b /= 10; j--; } if (j > 0) { k = snprintf(p, l, "%s"USEC_FMT".%0*"PRI_USEC"%s", p > buf ? " " : "", a, j, b, table[i].suffix); t = 0; done = true; } } /* No? Then let's show it normally */ if (!done) { k = snprintf(p, l, "%s"USEC_FMT"%s", p > buf ? " " : "", a, table[i].suffix); t = b; } n = MIN((size_t) k, l); l -= n; p += n; something = true; } *p = 0; return buf; } static int parse_timestamp_impl(const char *t, usec_t *usec, bool with_tz) { static const struct { const char *name; const int nr; } day_nr[] = { { "Sunday", 0 }, { "Sun", 0 }, { "Monday", 1 }, { "Mon", 1 }, { "Tuesday", 2 }, { "Tue", 2 }, { "Wednesday", 3 }, { "Wed", 3 }, { "Thursday", 4 }, { "Thu", 4 }, { "Friday", 5 }, { "Fri", 5 }, { "Saturday", 6 }, { "Sat", 6 }, }; const char *k, *utc = NULL, *tzn = NULL; struct tm tm, copy; time_t x; usec_t x_usec, plus = 0, minus = 0, ret; int r, weekday = -1, dst = -1; size_t i; /* Allowed syntaxes: * * 2012-09-22 16:34:22 * 2012-09-22 16:34 (seconds will be set to 0) * 2012-09-22 (time will be set to 00:00:00) * 16:34:22 (date will be set to today) * 16:34 (date will be set to today, seconds to 0) * now * yesterday (time is set to 00:00:00) * today (time is set to 00:00:00) * tomorrow (time is set to 00:00:00) * +5min * -5days * @2147483647 (seconds since epoch) */ assert(t); if (t[0] == '@' && !with_tz) return parse_sec(t + 1, usec); ret = now(CLOCK_REALTIME); if (!with_tz) { if (streq(t, "now")) goto finish; else if (t[0] == '+') { r = parse_sec(t+1, &plus); if (r < 0) return r; goto finish; } else if (t[0] == '-') { r = parse_sec(t+1, &minus); if (r < 0) return r; goto finish; } else if ((k = endswith(t, " ago"))) { t = strndupa_safe(t, k - t); r = parse_sec(t, &minus); if (r < 0) return r; goto finish; } else if ((k = endswith(t, " left"))) { t = strndupa_safe(t, k - t); r = parse_sec(t, &plus); if (r < 0) return r; goto finish; } /* See if the timestamp is suffixed with UTC */ utc = endswith_no_case(t, " UTC"); if (utc) t = strndupa_safe(t, utc - t); else { const char *e = NULL; int j; tzset(); /* See if the timestamp is suffixed by either the DST or non-DST local timezone. Note that we only * support the local timezones here, nothing else. Not because we wouldn't want to, but simply because * there are no nice APIs available to cover this. By accepting the local time zone strings, we make * sure that all timestamps written by format_timestamp() can be parsed correctly, even though we don't * support arbitrary timezone specifications. */ for (j = 0; j <= 1; j++) { if (isempty(tzname[j])) continue; e = endswith_no_case(t, tzname[j]); if (!e) continue; if (e == t) continue; if (e[-1] != ' ') continue; break; } if (IN_SET(j, 0, 1)) { /* Found one of the two timezones specified. */ t = strndupa_safe(t, e - t - 1); dst = j; tzn = tzname[j]; } } } x = (time_t) (ret / USEC_PER_SEC); x_usec = 0; if (!localtime_or_gmtime_r(&x, &tm, utc)) return -EINVAL; tm.tm_isdst = dst; if (!with_tz && tzn) tm.tm_zone = tzn; if (streq(t, "today")) { tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } else if (streq(t, "yesterday")) { tm.tm_mday--; tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } else if (streq(t, "tomorrow")) { tm.tm_mday++; tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } for (i = 0; i < ELEMENTSOF(day_nr); i++) { size_t skip; if (!startswith_no_case(t, day_nr[i].name)) continue; skip = strlen(day_nr[i].name); if (t[skip] != ' ') continue; weekday = day_nr[i].nr; t += skip + 1; break; } copy = tm; k = strptime(t, "%y-%m-%d %H:%M:%S", &tm); if (k) { if (*k == '.') goto parse_usec; else if (*k == 0) goto from_tm; } tm = copy; k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm); if (k) { if (*k == '.') goto parse_usec; else if (*k == 0) goto from_tm; } tm = copy; k = strptime(t, "%y-%m-%d %H:%M", &tm); if (k && *k == 0) { tm.tm_sec = 0; goto from_tm; } tm = copy; k = strptime(t, "%Y-%m-%d %H:%M", &tm); if (k && *k == 0) { tm.tm_sec = 0; goto from_tm; } tm = copy; k = strptime(t, "%y-%m-%d", &tm); if (k && *k == 0) { tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } tm = copy; k = strptime(t, "%Y-%m-%d", &tm); if (k && *k == 0) { tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } tm = copy; k = strptime(t, "%H:%M:%S", &tm); if (k) { if (*k == '.') goto parse_usec; else if (*k == 0) goto from_tm; } tm = copy; k = strptime(t, "%H:%M", &tm); if (k && *k == 0) { tm.tm_sec = 0; goto from_tm; } return -EINVAL; parse_usec: { unsigned add; k++; r = parse_fractional_part_u(&k, 6, &add); if (r < 0) return -EINVAL; if (*k) return -EINVAL; x_usec = add; } from_tm: if (weekday >= 0 && tm.tm_wday != weekday) return -EINVAL; x = mktime_or_timegm(&tm, utc); if (x < 0) return -EINVAL; ret = (usec_t) x * USEC_PER_SEC + x_usec; if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX) return -EINVAL; finish: if (ret + plus < ret) /* overflow? */ return -EINVAL; ret += plus; if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX) return -EINVAL; if (ret >= minus) ret -= minus; else return -EINVAL; if (usec) *usec = ret; return 0; } typedef struct ParseTimestampResult { usec_t usec; int return_value; } ParseTimestampResult; int parse_timestamp(const char *t, usec_t *usec) { char *last_space, *tz = NULL; ParseTimestampResult *shared, tmp; int r; last_space = strrchr(t, ' '); if (last_space != NULL && timezone_is_valid(last_space + 1, LOG_DEBUG)) tz = last_space + 1; if (!tz || endswith_no_case(t, " UTC")) return parse_timestamp_impl(t, usec, false); shared = mmap(NULL, sizeof *shared, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (shared == MAP_FAILED) return negative_errno(); r = safe_fork("(sd-timestamp)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT, NULL); if (r < 0) { (void) munmap(shared, sizeof *shared); return r; } if (r == 0) { bool with_tz = true; char *colon_tz; /* tzset(3) says $TZ should be prefixed with ":" if we reference timezone files */ colon_tz = strjoina(":", tz); if (setenv("TZ", colon_tz, 1) != 0) { shared->return_value = negative_errno(); _exit(EXIT_FAILURE); } tzset(); /* If there is a timezone that matches the tzname fields, leave the parsing to the implementation. * Otherwise just cut it off. */ with_tz = !STR_IN_SET(tz, tzname[0], tzname[1]); /* Cut off the timezone if we don't need it. */ if (with_tz) t = strndupa_safe(t, last_space - t); shared->return_value = parse_timestamp_impl(t, &shared->usec, with_tz); _exit(EXIT_SUCCESS); } tmp = *shared; if (munmap(shared, sizeof *shared) != 0) return negative_errno(); if (tmp.return_value == 0 && usec) *usec = tmp.usec; return tmp.return_value; } static const char* extract_multiplier(const char *p, usec_t *multiplier) { static const struct { const char *suffix; usec_t usec; } table[] = { { "seconds", USEC_PER_SEC }, { "second", USEC_PER_SEC }, { "sec", USEC_PER_SEC }, { "s", USEC_PER_SEC }, { "minutes", USEC_PER_MINUTE }, { "minute", USEC_PER_MINUTE }, { "min", USEC_PER_MINUTE }, { "months", USEC_PER_MONTH }, { "month", USEC_PER_MONTH }, { "M", USEC_PER_MONTH }, { "msec", USEC_PER_MSEC }, { "ms", USEC_PER_MSEC }, { "m", USEC_PER_MINUTE }, { "hours", USEC_PER_HOUR }, { "hour", USEC_PER_HOUR }, { "hr", USEC_PER_HOUR }, { "h", USEC_PER_HOUR }, { "days", USEC_PER_DAY }, { "day", USEC_PER_DAY }, { "d", USEC_PER_DAY }, { "weeks", USEC_PER_WEEK }, { "week", USEC_PER_WEEK }, { "w", USEC_PER_WEEK }, { "years", USEC_PER_YEAR }, { "year", USEC_PER_YEAR }, { "y", USEC_PER_YEAR }, { "usec", 1ULL }, { "us", 1ULL }, { "µs", 1ULL }, }; for (size_t i = 0; i < ELEMENTSOF(table); i++) { char *e; e = startswith(p, table[i].suffix); if (e) { *multiplier = table[i].usec; return e; } } return p; } int parse_time(const char *t, usec_t *usec, usec_t default_unit) { const char *p, *s; usec_t r = 0; bool something = false; assert(t); assert(default_unit > 0); p = t; p += strspn(p, WHITESPACE); s = startswith(p, "infinity"); if (s) { s += strspn(s, WHITESPACE); if (*s != 0) return -EINVAL; if (usec) *usec = USEC_INFINITY; return 0; } for (;;) { usec_t multiplier = default_unit, k; long long l; char *e; p += strspn(p, WHITESPACE); if (*p == 0) { if (!something) return -EINVAL; break; } if (*p == '-') /* Don't allow "-0" */ return -ERANGE; errno = 0; l = strtoll(p, &e, 10); if (errno > 0) return -errno; if (l < 0) return -ERANGE; if (*e == '.') { p = e + 1; p += strspn(p, DIGITS); } else if (e == p) return -EINVAL; else p = e; s = extract_multiplier(p + strspn(p, WHITESPACE), &multiplier); if (s == p && *s != '\0') /* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56' */ return -EINVAL; p = s; if ((usec_t) l >= USEC_INFINITY / multiplier) return -ERANGE; k = (usec_t) l * multiplier; if (k >= USEC_INFINITY - r) return -ERANGE; r += k; something = true; if (*e == '.') { usec_t m = multiplier / 10; const char *b; for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) { k = (usec_t) (*b - '0') * m; if (k >= USEC_INFINITY - r) return -ERANGE; r += k; } /* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge" */ if (b == e + 1) return -EINVAL; } } if (usec) *usec = r; return 0; } int parse_sec(const char *t, usec_t *usec) { return parse_time(t, usec, USEC_PER_SEC); } int parse_sec_fix_0(const char *t, usec_t *ret) { usec_t k; int r; assert(t); assert(ret); r = parse_sec(t, &k); if (r < 0) return r; *ret = k == 0 ? USEC_INFINITY : k; return r; } int parse_sec_def_infinity(const char *t, usec_t *ret) { t += strspn(t, WHITESPACE); if (isempty(t)) { *ret = USEC_INFINITY; return 0; } return parse_sec(t, ret); } static const char* extract_nsec_multiplier(const char *p, nsec_t *multiplier) { static const struct { const char *suffix; nsec_t nsec; } table[] = { { "seconds", NSEC_PER_SEC }, { "second", NSEC_PER_SEC }, { "sec", NSEC_PER_SEC }, { "s", NSEC_PER_SEC }, { "minutes", NSEC_PER_MINUTE }, { "minute", NSEC_PER_MINUTE }, { "min", NSEC_PER_MINUTE }, { "months", NSEC_PER_MONTH }, { "month", NSEC_PER_MONTH }, { "M", NSEC_PER_MONTH }, { "msec", NSEC_PER_MSEC }, { "ms", NSEC_PER_MSEC }, { "m", NSEC_PER_MINUTE }, { "hours", NSEC_PER_HOUR }, { "hour", NSEC_PER_HOUR }, { "hr", NSEC_PER_HOUR }, { "h", NSEC_PER_HOUR }, { "days", NSEC_PER_DAY }, { "day", NSEC_PER_DAY }, { "d", NSEC_PER_DAY }, { "weeks", NSEC_PER_WEEK }, { "week", NSEC_PER_WEEK }, { "w", NSEC_PER_WEEK }, { "years", NSEC_PER_YEAR }, { "year", NSEC_PER_YEAR }, { "y", NSEC_PER_YEAR }, { "usec", NSEC_PER_USEC }, { "us", NSEC_PER_USEC }, { "µs", NSEC_PER_USEC }, { "nsec", 1ULL }, { "ns", 1ULL }, { "", 1ULL }, /* default is nsec */ }; size_t i; for (i = 0; i < ELEMENTSOF(table); i++) { char *e; e = startswith(p, table[i].suffix); if (e) { *multiplier = table[i].nsec; return e; } } return p; } int parse_nsec(const char *t, nsec_t *nsec) { const char *p, *s; nsec_t r = 0; bool something = false; assert(t); assert(nsec); p = t; p += strspn(p, WHITESPACE); s = startswith(p, "infinity"); if (s) { s += strspn(s, WHITESPACE); if (*s != 0) return -EINVAL; *nsec = NSEC_INFINITY; return 0; } for (;;) { nsec_t multiplier = 1, k; long long l; char *e; p += strspn(p, WHITESPACE); if (*p == 0) { if (!something) return -EINVAL; break; } if (*p == '-') /* Don't allow "-0" */ return -ERANGE; errno = 0; l = strtoll(p, &e, 10); if (errno > 0) return -errno; if (l < 0) return -ERANGE; if (*e == '.') { p = e + 1; p += strspn(p, DIGITS); } else if (e == p) return -EINVAL; else p = e; s = extract_nsec_multiplier(p + strspn(p, WHITESPACE), &multiplier); if (s == p && *s != '\0') /* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56' */ return -EINVAL; p = s; if ((nsec_t) l >= NSEC_INFINITY / multiplier) return -ERANGE; k = (nsec_t) l * multiplier; if (k >= NSEC_INFINITY - r) return -ERANGE; r += k; something = true; if (*e == '.') { nsec_t m = multiplier / 10; const char *b; for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) { k = (nsec_t) (*b - '0') * m; if (k >= NSEC_INFINITY - r) return -ERANGE; r += k; } /* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge" */ if (b == e + 1) return -EINVAL; } } *nsec = r; return 0; } static int get_timezones_from_zone1970_tab(char ***ret) { _cleanup_fclose_ FILE *f = NULL; _cleanup_strv_free_ char **zones = NULL; int r; assert(ret); f = fopen("/usr/share/zoneinfo/zone1970.tab", "re"); if (!f) return -errno; for (;;) { _cleanup_free_ char *line = NULL, *cc = NULL, *co = NULL, *tz = NULL; r = read_line(f, LONG_LINE_MAX, &line); if (r < 0) return r; if (r == 0) break; const char *p = line; /* Line format is: * 'country codes' 'coordinates' 'timezone' 'comments' */ r = extract_many_words(&p, NULL, 0, &cc, &co, &tz, NULL); if (r < 0) continue; /* Lines that start with # are comments. */ if (*cc == '#') continue; r = strv_extend(&zones, tz); if (r < 0) return r; } *ret = TAKE_PTR(zones); return 0; } static int get_timezones_from_tzdata_zi(char ***ret) { _cleanup_fclose_ FILE *f = NULL; _cleanup_strv_free_ char **zones = NULL; int r; f = fopen("/usr/share/zoneinfo/tzdata.zi", "re"); if (!f) return -errno; for (;;) { _cleanup_free_ char *line = NULL, *type = NULL, *f1 = NULL, *f2 = NULL; r = read_line(f, LONG_LINE_MAX, &line); if (r < 0) return r; if (r == 0) break; const char *p = line; /* The only lines we care about are Zone and Link lines. * Zone line format is: * 'Zone' 'timezone' ... * Link line format is: * 'Link' 'target' 'alias' * See 'man zic' for more detail. */ r = extract_many_words(&p, NULL, 0, &type, &f1, &f2, NULL); if (r < 0) continue; char *tz; if (IN_SET(*type, 'Z', 'z')) /* Zone lines have timezone in field 1. */ tz = f1; else if (IN_SET(*type, 'L', 'l')) /* Link lines have timezone in field 2. */ tz = f2; else /* Not a line we care about. */ continue; r = strv_extend(&zones, tz); if (r < 0) return r; } *ret = TAKE_PTR(zones); return 0; } int get_timezones(char ***ret) { _cleanup_strv_free_ char **zones = NULL; int r; assert(ret); r = get_timezones_from_tzdata_zi(&zones); if (r == -ENOENT) { log_debug_errno(r, "Could not get timezone data from tzdata.zi, using zone1970.tab: %m"); r = get_timezones_from_zone1970_tab(&zones); if (r == -ENOENT) log_debug_errno(r, "Could not get timezone data from zone1970.tab, using UTC: %m"); } if (r < 0 && r != -ENOENT) return r; /* Always include UTC */ r = strv_extend(&zones, "UTC"); if (r < 0) return -ENOMEM; strv_sort(zones); strv_uniq(zones); *ret = TAKE_PTR(zones); return 0; } int verify_timezone(const char *name, int log_level) { bool slash = false; const char *p, *t; _cleanup_close_ int fd = -1; char buf[4]; int r; if (isempty(name)) return -EINVAL; /* Always accept "UTC" as valid timezone, since it's the fallback, even if user has no timezones installed. */ if (streq(name, "UTC")) return 0; if (name[0] == '/') return -EINVAL; for (p = name; *p; p++) { if (!(*p >= '0' && *p <= '9') && !(*p >= 'a' && *p <= 'z') && !(*p >= 'A' && *p <= 'Z') && !IN_SET(*p, '-', '_', '+', '/')) return -EINVAL; if (*p == '/') { if (slash) return -EINVAL; slash = true; } else slash = false; } if (slash) return -EINVAL; if (p - name >= PATH_MAX) return -ENAMETOOLONG; t = strjoina("/usr/share/zoneinfo/", name); fd = open(t, O_RDONLY|O_CLOEXEC); if (fd < 0) return log_full_errno(log_level, errno, "Failed to open timezone file '%s': %m", t); r = fd_verify_regular(fd); if (r < 0) return log_full_errno(log_level, r, "Timezone file '%s' is not a regular file: %m", t); r = loop_read_exact(fd, buf, 4, false); if (r < 0) return log_full_errno(log_level, r, "Failed to read from timezone file '%s': %m", t); /* Magic from tzfile(5) */ if (memcmp(buf, "TZif", 4) != 0) return log_full_errno(log_level, SYNTHETIC_ERRNO(EBADMSG), "Timezone file '%s' has wrong magic bytes", t); return 0; } bool clock_boottime_supported(void) { static int supported = -1; /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */ if (supported < 0) { int fd; fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC); if (fd < 0) supported = false; else { safe_close(fd); supported = true; } } return supported; } clockid_t clock_boottime_or_monotonic(void) { if (clock_boottime_supported()) return CLOCK_BOOTTIME; else return CLOCK_MONOTONIC; } bool clock_supported(clockid_t clock) { struct timespec ts; switch (clock) { case CLOCK_MONOTONIC: case CLOCK_REALTIME: return true; case CLOCK_BOOTTIME: return clock_boottime_supported(); case CLOCK_BOOTTIME_ALARM: if (!clock_boottime_supported()) return false; _fallthrough_; default: /* For everything else, check properly */ return clock_gettime(clock, &ts) >= 0; } } int get_timezone(char **ret) { _cleanup_free_ char *t = NULL; const char *e; char *z; int r; r = readlink_malloc("/etc/localtime", &t); if (r == -ENOENT) { /* If the symlink does not exist, assume "UTC", like glibc does */ z = strdup("UTC"); if (!z) return -ENOMEM; *ret = z; return 0; } if (r < 0) return r; /* returns EINVAL if not a symlink */ e = PATH_STARTSWITH_SET(t, "/usr/share/zoneinfo/", "../usr/share/zoneinfo/"); if (!e) return -EINVAL; if (!timezone_is_valid(e, LOG_DEBUG)) return -EINVAL; z = strdup(e); if (!z) return -ENOMEM; *ret = z; return 0; } time_t mktime_or_timegm(struct tm *tm, bool utc) { return utc ? timegm(tm) : mktime(tm); } struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) { return utc ? gmtime_r(t, tm) : localtime_r(t, tm); } static uint32_t sysconf_clock_ticks_cached(void) { static thread_local uint32_t hz = 0; long r; if (hz == 0) { r = sysconf(_SC_CLK_TCK); assert(r > 0); hz = r; } return hz; } uint32_t usec_to_jiffies(usec_t u) { uint32_t hz = sysconf_clock_ticks_cached(); return DIV_ROUND_UP(u, USEC_PER_SEC / hz); } usec_t jiffies_to_usec(uint32_t j) { uint32_t hz = sysconf_clock_ticks_cached(); return DIV_ROUND_UP(j * USEC_PER_SEC, hz); } usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to) { usec_t a, b; if (x == USEC_INFINITY) return USEC_INFINITY; if (map_clock_id(from) == map_clock_id(to)) return x; a = now(from); b = now(to); if (x > a) /* x lies in the future */ return usec_add(b, usec_sub_unsigned(x, a)); else /* x lies in the past */ return usec_sub_unsigned(b, usec_sub_unsigned(a, x)); } bool in_utc_timezone(void) { tzset(); return timezone == 0 && daylight == 0; } int time_change_fd(void) { /* We only care for the cancellation event, hence we set the timeout to the latest possible value. */ static const struct itimerspec its = { .it_value.tv_sec = TIME_T_MAX, }; _cleanup_close_ int fd = -1; assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX)); /* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever CLOCK_REALTIME makes a jump relative to * CLOCK_MONOTONIC. */ fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); if (fd < 0) return -errno; if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) >= 0) return TAKE_FD(fd); /* So apparently there are systems where time_t is 64bit, but the kernel actually doesn't support * 64bit time_t. In that case configuring a timer to TIME_T_MAX will fail with EOPNOTSUPP or a * similar error. If that's the case let's try with INT32_MAX instead, maybe that works. It's a bit * of a black magic thing though, but what can we do? * * We don't want this code on x86-64, hence let's conditionalize this for systems with 64bit time_t * but where "long" is shorter than 64bit, i.e. 32bit archs. * * See: https://github.com/systemd/systemd/issues/14362 */ #if SIZEOF_TIME_T == 8 && ULONG_MAX < UINT64_MAX if (ERRNO_IS_NOT_SUPPORTED(errno) || errno == EOVERFLOW) { static const struct itimerspec its32 = { .it_value.tv_sec = INT32_MAX, }; if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its32, NULL) >= 0) return TAKE_FD(fd); } #endif return -errno; } static const char* const timestamp_style_table[_TIMESTAMP_STYLE_MAX] = { [TIMESTAMP_PRETTY] = "pretty", [TIMESTAMP_US] = "us", [TIMESTAMP_UTC] = "utc", [TIMESTAMP_US_UTC] = "us+utc", }; /* Use the macro for enum → string to allow for aliases */ _DEFINE_STRING_TABLE_LOOKUP_TO_STRING(timestamp_style, TimestampStyle,); /* For the string → enum mapping we use the generic implementation, but also support two aliases */ TimestampStyle timestamp_style_from_string(const char *s) { TimestampStyle t; t = (TimestampStyle) string_table_lookup(timestamp_style_table, ELEMENTSOF(timestamp_style_table), s); if (t >= 0) return t; if (streq_ptr(s, "µs")) return TIMESTAMP_US; if (streq_ptr(s, "µs+utc")) return TIMESTAMP_US_UTC; return t; }