/* Unix SMB/CIFS implementation. time handling functions Copyright (C) Andrew Tridgell 1992-2004 Copyright (C) Stefan (metze) Metzmacher 2002 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "system/time.h" /** * @file * @brief time handling functions */ #ifndef TIME_T_MIN /* we use 0 here, because (time_t)-1 means error */ #define TIME_T_MIN 0 #endif /* * we use the INT32_MAX here as on 64 bit systems, * gmtime() fails with INT64_MAX */ #ifndef TIME_T_MAX #define TIME_T_MAX MIN(INT32_MAX,_TYPE_MAXIMUM(time_t)) #endif /** External access to time_t_min and time_t_max. **/ _PUBLIC_ time_t get_time_t_max(void) { return TIME_T_MAX; } /** a gettimeofday wrapper **/ _PUBLIC_ void GetTimeOfDay(struct timeval *tval) { #ifdef HAVE_GETTIMEOFDAY_TZ gettimeofday(tval,NULL); #else gettimeofday(tval); #endif } #define TIME_FIXUP_CONSTANT 11644473600LL /** interpret an 8 byte "filetime" structure to a time_t It's originally in "100ns units since jan 1st 1601" **/ _PUBLIC_ time_t nt_time_to_unix(NTTIME nt) { if (nt == 0) { return 0; } if (nt == -1LL) { return (time_t)-1; } nt += 1000*1000*10/2; nt /= 1000*1000*10; nt -= TIME_FIXUP_CONSTANT; if (TIME_T_MIN > nt || nt > TIME_T_MAX) { return 0; } return (time_t)nt; } /** put a 8 byte filetime from a time_t This takes GMT as input **/ _PUBLIC_ void unix_to_nt_time(NTTIME *nt, time_t t) { uint64_t t2; if (t == (time_t)-1) { *nt = (NTTIME)-1LL; return; } if (t == 0) { *nt = 0; return; } t2 = t; t2 += TIME_FIXUP_CONSTANT; t2 *= 1000*1000*10; *nt = t2; } /** check if it's a null unix time **/ _PUBLIC_ bool null_time(time_t t) { return t == 0 || t == (time_t)0xFFFFFFFF || t == (time_t)-1; } /** check if it's a null NTTIME **/ _PUBLIC_ bool null_nttime(NTTIME t) { return t == 0 || t == (NTTIME)-1; } /******************************************************************* create a 16 bit dos packed date ********************************************************************/ static uint16_t make_dos_date1(struct tm *t) { uint16_t ret=0; ret = (((unsigned int)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1); ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5)); return ret; } /******************************************************************* create a 16 bit dos packed time ********************************************************************/ static uint16_t make_dos_time1(struct tm *t) { uint16_t ret=0; ret = ((((unsigned int)t->tm_min >> 3)&0x7) | (((unsigned int)t->tm_hour) << 3)); ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5)); return ret; } /******************************************************************* create a 32 bit dos packed date/time from some parameters This takes a GMT time and returns a packed localtime structure ********************************************************************/ static uint32_t make_dos_date(time_t unixdate, int zone_offset) { struct tm *t; uint32_t ret=0; if (unixdate == 0) { return 0; } unixdate -= zone_offset; t = gmtime(&unixdate); if (!t) { return 0xFFFFFFFF; } ret = make_dos_date1(t); ret = ((ret&0xFFFF)<<16) | make_dos_time1(t); return ret; } /** put a dos date into a buffer (time/date format) This takes GMT time and puts local time in the buffer **/ _PUBLIC_ void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset) { uint32_t x = make_dos_date(unixdate, zone_offset); SIVAL(buf,offset,x); } /** put a dos date into a buffer (date/time format) This takes GMT time and puts local time in the buffer **/ _PUBLIC_ void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset) { uint32_t x; x = make_dos_date(unixdate, zone_offset); x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16); SIVAL(buf,offset,x); } /** put a dos 32 bit "unix like" date into a buffer. This routine takes GMT and converts it to LOCAL time before putting it (most SMBs assume localtime for this sort of date) **/ _PUBLIC_ void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset) { if (!null_time(unixdate)) { unixdate -= zone_offset; } SIVAL(buf,offset,unixdate); } /******************************************************************* interpret a 32 bit dos packed date/time to some parameters ********************************************************************/ static void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second) { uint32_t p0,p1,p2,p3; p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF; p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF; *second = 2*(p0 & 0x1F); *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3); *hour = (p1>>3)&0xFF; *day = (p2&0x1F); *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1; *year = ((p3>>1)&0xFF) + 80; } /** create a unix date (int GMT) from a dos date (which is actually in localtime) **/ _PUBLIC_ time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset) { uint32_t dos_date=0; struct tm t; time_t ret; dos_date = IVAL(date_ptr,0); if (dos_date == 0) return (time_t)0; interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon, &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec); t.tm_isdst = -1; ret = timegm(&t); ret += zone_offset; return ret; } /** like make_unix_date() but the words are reversed **/ _PUBLIC_ time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset) { uint32_t x,x2; x = IVAL(date_ptr,0); x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16); SIVAL(&x,0,x2); return pull_dos_date((const uint8_t *)&x, zone_offset); } /** create a unix GMT date from a dos date in 32 bit "unix like" format these generally arrive as localtimes, with corresponding DST **/ _PUBLIC_ time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset) { time_t t = (time_t)IVAL(date_ptr,0); if (!null_time(t)) { t += zone_offset; } return t; } /** return a HTTP/1.0 time string **/ _PUBLIC_ char *http_timestring(TALLOC_CTX *mem_ctx, time_t t) { char *buf; char tempTime[60]; struct tm *tm = localtime(&t); if (!tm) { return talloc_asprintf(mem_ctx,"%ld seconds since the Epoch",(long)t); } #ifndef HAVE_STRFTIME buf = talloc_strdup(mem_ctx, asctime(tm)); if (buf[strlen(buf)-1] == '\n') { buf[strlen(buf)-1] = 0; } #else strftime(tempTime, sizeof(tempTime)-1, "%a, %d %b %Y %H:%M:%S %Z", tm); buf = talloc_strdup(mem_ctx, tempTime); #endif /* !HAVE_STRFTIME */ return buf; } /** Return the date and time as a string **/ _PUBLIC_ char *timestring(TALLOC_CTX *mem_ctx, time_t t) { char *TimeBuf; char tempTime[80]; struct tm *tm; tm = localtime(&t); if (!tm) { return talloc_asprintf(mem_ctx, "%ld seconds since the Epoch", (long)t); } #ifdef HAVE_STRFTIME /* some versions of gcc complain about using %c. This is a bug in the gcc warning, not a bug in this code. See a recent strftime() manual page for details. */ strftime(tempTime,sizeof(tempTime)-1,"%c %Z",tm); TimeBuf = talloc_strdup(mem_ctx, tempTime); #else TimeBuf = talloc_strdup(mem_ctx, asctime(tm)); #endif return TimeBuf; } /** return a talloced string representing a NTTIME for human consumption */ _PUBLIC_ const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt) { time_t t; if (nt == 0) { return "NTTIME(0)"; } t = nt_time_to_unix(nt); return timestring(mem_ctx, t); } /** put a NTTIME into a packet */ _PUBLIC_ void push_nttime(uint8_t *base, uint16_t offset, NTTIME t) { SBVAL(base, offset, t); } /** pull a NTTIME from a packet */ _PUBLIC_ NTTIME pull_nttime(uint8_t *base, uint16_t offset) { NTTIME ret = BVAL(base, offset); return ret; } /** return (tv1 - tv2) in microseconds */ _PUBLIC_ int64_t usec_time_diff(struct timeval *tv1, struct timeval *tv2) { int64_t sec_diff = tv1->tv_sec - tv2->tv_sec; return (sec_diff * 1000000) + (int64_t)(tv1->tv_usec - tv2->tv_usec); } /** return a zero timeval */ _PUBLIC_ struct timeval timeval_zero(void) { struct timeval tv; tv.tv_sec = 0; tv.tv_usec = 0; return tv; } /** return true if a timeval is zero */ _PUBLIC_ bool timeval_is_zero(const struct timeval *tv) { return tv->tv_sec == 0 && tv->tv_usec == 0; } /** return a timeval for the current time */ _PUBLIC_ struct timeval timeval_current(void) { struct timeval tv; GetTimeOfDay(&tv); return tv; } /** return a timeval struct with the given elements */ _PUBLIC_ struct timeval timeval_set(uint32_t secs, uint32_t usecs) { struct timeval tv; tv.tv_sec = secs; tv.tv_usec = usecs; return tv; } /** return a timeval ofs microseconds after tv */ _PUBLIC_ struct timeval timeval_add(const struct timeval *tv, uint32_t secs, uint32_t usecs) { struct timeval tv2 = *tv; const unsigned int million = 1000000; tv2.tv_sec += secs; tv2.tv_usec += usecs; tv2.tv_sec += tv2.tv_usec / million; tv2.tv_usec = tv2.tv_usec % million; return tv2; } /** return the sum of two timeval structures */ struct timeval timeval_sum(const struct timeval *tv1, const struct timeval *tv2) { return timeval_add(tv1, tv2->tv_sec, tv2->tv_usec); } /** return a timeval secs/usecs into the future */ _PUBLIC_ struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs) { struct timeval tv = timeval_current(); return timeval_add(&tv, secs, usecs); } /** compare two timeval structures. Return -1 if tv1 < tv2 Return 0 if tv1 == tv2 Return 1 if tv1 > tv2 */ _PUBLIC_ int timeval_compare(const struct timeval *tv1, const struct timeval *tv2) { if (tv1->tv_sec > tv2->tv_sec) return 1; if (tv1->tv_sec < tv2->tv_sec) return -1; if (tv1->tv_usec > tv2->tv_usec) return 1; if (tv1->tv_usec < tv2->tv_usec) return -1; return 0; } /** return true if a timer is in the past */ _PUBLIC_ bool timeval_expired(const struct timeval *tv) { struct timeval tv2 = timeval_current(); if (tv2.tv_sec > tv->tv_sec) return true; if (tv2.tv_sec < tv->tv_sec) return false; return (tv2.tv_usec >= tv->tv_usec); } /** return the number of seconds elapsed between two times */ _PUBLIC_ double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2) { return (tv2->tv_sec - tv1->tv_sec) + (tv2->tv_usec - tv1->tv_usec)*1.0e-6; } /** return the number of seconds elapsed since a given time */ _PUBLIC_ double timeval_elapsed(const struct timeval *tv) { struct timeval tv2 = timeval_current(); return timeval_elapsed2(tv, &tv2); } /** return the lesser of two timevals */ _PUBLIC_ struct timeval timeval_min(const struct timeval *tv1, const struct timeval *tv2) { if (tv1->tv_sec < tv2->tv_sec) return *tv1; if (tv1->tv_sec > tv2->tv_sec) return *tv2; if (tv1->tv_usec < tv2->tv_usec) return *tv1; return *tv2; } /** return the greater of two timevals */ _PUBLIC_ struct timeval timeval_max(const struct timeval *tv1, const struct timeval *tv2) { if (tv1->tv_sec > tv2->tv_sec) return *tv1; if (tv1->tv_sec < tv2->tv_sec) return *tv2; if (tv1->tv_usec > tv2->tv_usec) return *tv1; return *tv2; } /** return the difference between two timevals as a timeval if tv1 comes after tv2, then return a zero timeval (this is *tv2 - *tv1) */ _PUBLIC_ struct timeval timeval_until(const struct timeval *tv1, const struct timeval *tv2) { struct timeval t; if (timeval_compare(tv1, tv2) >= 0) { return timeval_zero(); } t.tv_sec = tv2->tv_sec - tv1->tv_sec; if (tv1->tv_usec > tv2->tv_usec) { t.tv_sec--; t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec); } else { t.tv_usec = tv2->tv_usec - tv1->tv_usec; } return t; } /** convert a timeval to a NTTIME */ _PUBLIC_ NTTIME timeval_to_nttime(const struct timeval *tv) { return 10*(tv->tv_usec + ((TIME_FIXUP_CONSTANT + (uint64_t)tv->tv_sec) * 1000000)); } /** convert a NTTIME to a timeval */ _PUBLIC_ void nttime_to_timeval(struct timeval *tv, NTTIME t) { if (tv == NULL) return; t += 10/2; t /= 10; t -= TIME_FIXUP_CONSTANT*1000*1000; tv->tv_sec = t / 1000000; if (TIME_T_MIN > tv->tv_sec || tv->tv_sec > TIME_T_MAX) { tv->tv_sec = 0; tv->tv_usec = 0; return; } tv->tv_usec = t - tv->tv_sec*1000000; } /******************************************************************* yield the difference between *A and *B, in seconds, ignoring leap seconds ********************************************************************/ static int tm_diff(struct tm *a, struct tm *b) { int ay = a->tm_year + (1900 - 1); int by = b->tm_year + (1900 - 1); int intervening_leap_days = (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400); int years = ay - by; int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday); int hours = 24*days + (a->tm_hour - b->tm_hour); int minutes = 60*hours + (a->tm_min - b->tm_min); int seconds = 60*minutes + (a->tm_sec - b->tm_sec); return seconds; } /** return the UTC offset in seconds west of UTC, or 0 if it cannot be determined */ _PUBLIC_ int get_time_zone(time_t t) { struct tm *tm = gmtime(&t); struct tm tm_utc; if (!tm) return 0; tm_utc = *tm; tm = localtime(&t); if (!tm) return 0; return tm_diff(&tm_utc,tm); }