/*
* Copyright (c) 2000-2001, Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: smbfs_subr.c,v 1.18 2005/02/02 00:22:23 lindak Exp $
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Time conversion functions (to/from DOS, NT times)
* From BSD/Darwin smbfs_subr.c
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/sunddi.h>
#include <netsmb/smb_osdep.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
/*
* Time & date conversion routines taken from msdosfs. Although leap
* year calculation is bogus, it's sufficient before 2100 :)
*/
/*
* This is the format of the contents of the deTime field in the direntry
* structure.
* We don't use bitfields because we don't know how compilers for
* arbitrary machines will lay them out.
*/
#define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
#define DT_2SECONDS_SHIFT 0
#define DT_MINUTES_MASK 0x7E0 /* minutes */
#define DT_MINUTES_SHIFT 5
#define DT_HOURS_MASK 0xF800 /* hours */
#define DT_HOURS_SHIFT 11
/*
* This is the format of the contents of the deDate field in the direntry
* structure.
*/
#define DD_DAY_MASK 0x1F /* day of month */
#define DD_DAY_SHIFT 0
#define DD_MONTH_MASK 0x1E0 /* month */
#define DD_MONTH_SHIFT 5
#define DD_YEAR_MASK 0xFE00 /* year - 1980 */
#define DD_YEAR_SHIFT 9
/*
* Total number of days that have passed for each month in a regular year.
*/
static ushort_t regyear[] = {
31, 59, 90, 120, 151, 181,
212, 243, 273, 304, 334, 365
};
/*
* Total number of days that have passed for each month in a leap year.
*/
static ushort_t leapyear[] = {
31, 60, 91, 121, 152, 182,
213, 244, 274, 305, 335, 366
};
/*
* Variables used to remember parts of the last time conversion. Maybe we
* can avoid a full conversion.
*/
static ulong_t lasttime;
static ulong_t lastday;
static ushort_t lastddate;
static ushort_t lastdtime;
/* Lock for the lastxxx variables */
static kmutex_t lastdt_lock;
/*
* Number of seconds between 1970 and 1601 year
* (134774 days)
*/
const uint64_t DIFF1970TO1601 = 11644473600ULL;
const uint32_t TEN_MIL = 10000000UL;
/*
* Convert NT time (tenths of microseconds since 1601)
* to Unix seconds+nanoseconds since 1970. Any time
* earlier than 1970 is converted to Unix time zero.
* Both are GMT-based (no time zone adjustments).
*/
void
smb_time_NT2local(uint64_t nt_time, struct timespec *tsp)
{
uint64_t nt_sec; /* seconds */
uint64_t nt_tus; /* tenths of uSec. */
/* Optimize time zero. */
if (nt_time == 0) {
tsp->tv_sec = 0;
tsp->tv_nsec = 0;
return;
}
nt_sec = nt_time / TEN_MIL;
nt_tus = nt_time % TEN_MIL;
if (nt_sec <= DIFF1970TO1601) {
tsp->tv_sec = 0;
tsp->tv_nsec = 0;
return;
}
tsp->tv_sec = nt_sec - DIFF1970TO1601;
tsp->tv_nsec = nt_tus * 100;
}
/*
* Convert Unix time (seconds+nanoseconds since 1970)
* to NT time (tenths of microseconds since 1601).
* Exception: Convert time zero (really any time in
* the first second of 1970) to NT time zero.
* Both are GMT-based (no time zone adjustments).
*/
void
smb_time_local2NT(struct timespec *tsp, uint64_t *nt_time)
{
uint64_t nt_sec; /* seconds */
uint64_t nt_tus; /* tenths of uSec. */
if (tsp->tv_sec == 0) {
*nt_time = 0;
return;
}
nt_sec = tsp->tv_sec + DIFF1970TO1601;
nt_tus = tsp->tv_nsec / 100;
*nt_time = (uint64_t)nt_sec * TEN_MIL + nt_tus;
}
/*
* Time zone conversion stuff, only used in old dialects.
* Don't adjust time zero for either conversion.
*/
void
smb_time_local2server(struct timespec *tsp, int tzoff, long *seconds)
{
if (tsp->tv_sec <= (tzoff * 60))
*seconds = 0;
else
*seconds = tsp->tv_sec - (tzoff * 60);
}
void
smb_time_server2local(ulong_t seconds, int tzoff, struct timespec *tsp)
{
if (seconds == 0)
tsp->tv_sec = 0;
else
tsp->tv_sec = seconds + tzoff * 60;
tsp->tv_nsec = 0;
}
/*
* Time conversions to/from DOS format, for old dialects.
*/
void
smb_time_unix2dos(struct timespec *tsp, int tzoff, u_int16_t *ddp,
u_int16_t *dtp, u_int8_t *dhp)
{
long t;
ulong_t days, year, month, inc;
ushort_t *months;
mutex_enter(&lastdt_lock);
/*
* If the time from the last conversion is the same as now, then
* skip the computations and use the saved result.
*/
smb_time_local2server(tsp, tzoff, &t);
t &= ~1;
if (lasttime != t) {
lasttime = t;
if (t < 0) {
/*
* This is before 1970, so it's before 1980,
* and can't be represented as a DOS time.
* Just represent it as the DOS epoch.
*/
lastdtime = 0;
lastddate = (1 << DD_DAY_SHIFT)
+ (1 << DD_MONTH_SHIFT)
+ ((1980 - 1980) << DD_YEAR_SHIFT);
} else {
lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
+ (((t / 60) % 60) << DT_MINUTES_SHIFT)
+ (((t / 3600) % 24) << DT_HOURS_SHIFT);
/*
* If the number of days since 1970 is the same as
* the last time we did the computation then skip
* all this leap year and month stuff.
*/
days = t / (24 * 60 * 60);
if (days != lastday) {
lastday = days;
for (year = 1970; ; year++) {
/*
* XXX - works in 2000, but won't
* work in 2100.
*/
inc = year & 0x03 ? 365 : 366;
if (days < inc)
break;
days -= inc;
}
/*
* XXX - works in 2000, but won't work in 2100.
*/
months = year & 0x03 ? regyear : leapyear;
for (month = 0; days >= months[month]; month++)
;
if (month > 0)
days -= months[month - 1];
lastddate = ((days + 1) << DD_DAY_SHIFT)
+ ((month + 1) << DD_MONTH_SHIFT);
/*
* Remember DOS's idea of time is relative
* to 1980, but UN*X's is relative to 1970.
* If somehow we get a time before 1980 then
* don't give totally crazy results.
*/
if (year > 1980)
lastddate += (year - 1980) <<
DD_YEAR_SHIFT;
}
}
}
if (dhp)
*dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
*ddp = lastddate;
*dtp = lastdtime;
mutex_exit(&lastdt_lock);
}
/*
* The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
* interval there were 8 regular years and 2 leap years.
*/
#define SECONDSTO1980 (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
static ushort_t lastdosdate;
static ulong_t lastseconds;
void
smb_dos2unixtime(uint_t dd, uint_t dt, uint_t dh, int tzoff,
struct timespec *tsp)
{
ulong_t seconds;
ulong_t month;
ulong_t year;
ulong_t days;
ushort_t *months;
if (dd == 0) {
tsp->tv_sec = 0;
tsp->tv_nsec = 0;
return;
}
seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
+ ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
+ ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
+ dh / 100;
/*
* If the year, month, and day from the last conversion are the
* same then use the saved value.
*/
mutex_enter(&lastdt_lock);
if (lastdosdate != dd) {
lastdosdate = (ushort_t)dd;
days = 0;
year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
days = year * 365;
days += year / 4 + 1; /* add in leap days */
/*
* XXX - works in 2000, but won't work in 2100.
*/
if ((year & 0x03) == 0)
days--; /* if year is a leap year */
months = year & 0x03 ? regyear : leapyear;
month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
if (month < 1 || month > 12) {
month = 1;
}
if (month > 1)
days += months[month - 2];
days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
}
smb_time_server2local(seconds + lastseconds, tzoff, tsp);
tsp->tv_nsec = (dh % 100) * 10000000;
mutex_exit(&lastdt_lock);
}
void
smb_time_init(void)
{
mutex_init(&lastdt_lock, NULL, MUTEX_DEFAULT, NULL);
}
void
smb_time_fini(void)
{
mutex_destroy(&lastdt_lock);
}