/* crypto/o_time.c */

/*

 * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project

 * 2001.

 */

/*

 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project

 * 2008.

 */

/* ====================================================================

 * Copyright (c) 2001 The OpenSSL Project.  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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <openssl/e_os2.h>

#include <string.h>

#include "o_time.h"

#ifdef OPENSSL_SYS_VMS

# if __CRTL_VER >= 70000000 && \

     (defined _POSIX_C_SOURCE || !defined _ANSI_C_SOURCE)

#  define VMS_GMTIME_OK

# endif

# ifndef VMS_GMTIME_OK

#  include <libdtdef.h>

#  include <lib$routines.h>

#  include <lnmdef.h>

#  include <starlet.h>

#  include <descrip.h>

#  include <stdlib.h>

# endif                         /* ndef VMS_GMTIME_OK */

/*

 * Needed to pick up the correct definitions and declarations in some of the

 * DEC C Header Files (*.H).

 */

# define __NEW_STARLET 1

# if (defined(__alpha) || defined(__ia64))

#  include <iledef.h>

# else

/* VAX */

typedef struct _ile3 {          /* Copied from ILEDEF.H for Alpha   */

#  pragma __nomember_alignment

    unsigned short int ile3$w_length;        /* Length of buffer in bytes */

    unsigned short int ile3$w_code;          /* Item code value */

    void *ile3$ps_bufaddr;                   /* Buffer address */

    unsigned short int *ile3$ps_retlen_addr; /* Address of word for returned length */

} ILE3;

# endif   /* alpha || ia64    */

#endif    /* OPENSSL_SYS_VMS  */

struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result)

{

    struct tm *ts = NULL;

#if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_OS2) && (!defined(OPENSSL_SYS_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX) && !defined(OPENSSL_SYS_SUNOS)

    if (gmtime_r(timer, result) == NULL)

        return NULL;

    ts = result;

#elif !defined(OPENSSL_SYS_VMS) || defined(VMS_GMTIME_OK)

    ts = gmtime(timer);

    if (ts == NULL)

        return NULL;

    memcpy(result, ts, sizeof(struct tm));

    ts = result;

#endif

#if defined( OPENSSL_SYS_VMS) && !defined( VMS_GMTIME_OK)

    if (ts == NULL) {

        static $DESCRIPTOR(tabnam, "LNM$DCL_LOGICAL");

        static $DESCRIPTOR(lognam, "SYS$TIMEZONE_DIFFERENTIAL");

        char logvalue[256];

        unsigned int reslen = 0;

# if __INITIAL_POINTER_SIZE == 64

        ILEB_64 itemlist[2], *pitem;

# else

        ILE3 itemlist[2], *pitem;

# endif

        int status;

        time_t t;

        /*

         * Setup an itemlist for the call to $TRNLNM - Translate Logical Name.

         */

        pitem = itemlist;

# if __INITIAL_POINTER_SIZE == 64

        pitem->ileb_64$w_mbo = 1;

        pitem->ileb_64$w_code = LNM$_STRING;

        pitem->ileb_64$l_mbmo = -1;

        pitem->ileb_64$q_length = sizeof (logvalue);

        pitem->ileb_64$pq_bufaddr = logvalue;

        pitem->ileb_64$pq_retlen_addr = (unsigned __int64 *) &reslen;

        pitem++;

        /* Last item of the item list is null terminated */

        pitem->ileb_64$q_length = pitem->ileb_64$w_code = 0;

# else

        pitem->ile3$w_length = sizeof (logvalue);

        pitem->ile3$w_code = LNM$_STRING;

        pitem->ile3$ps_bufaddr = logvalue;

        pitem->ile3$ps_retlen_addr = (unsigned short int *) &reslen;

        pitem++;

        /* Last item of the item list is null terminated */

        pitem->ile3$w_length = pitem->ile3$w_code = 0;

# endif

        /* Get the value for SYS$TIMEZONE_DIFFERENTIAL */

        status = sys$trnlnm(0, &tabnam, &lognam, 0, itemlist);

        if (!(status & 1))

            return NULL;

        logvalue[reslen] = '\0';

        t = *timer;

        /* The following is extracted from the DEC C header time.h */

        /*

         **  Beginning in OpenVMS Version 7.0 mktime, time, ctime, strftime

         **  have two implementations.  One implementation is provided

         **  for compatibility and deals with time in terms of local time,

         **  the other __utc_* deals with time in terms of UTC.

         */

        /*

         * We use the same conditions as in said time.h to check if we should

         * assume that t contains local time (and should therefore be

         * adjusted) or UTC (and should therefore be left untouched).

         */

# if __CRTL_VER < 70000000 || defined _VMS_V6_SOURCE

        /* Get the numerical value of the equivalence string */

        status = atoi(logvalue);

        /* and use it to move time to GMT */

        t -= status;

# endif

        /* then convert the result to the time structure */

        /*

         * Since there was no gmtime_r() to do this stuff for us, we have to

         * do it the hard way.

         */

        {

            /*-

             * The VMS epoch is the astronomical Smithsonian date,

               if I remember correctly, which is November 17, 1858.

               Furthermore, time is measure in thenths of microseconds

               and stored in quadwords (64 bit integers).  unix_epoch

               below is January 1st 1970 expressed as a VMS time.  The

               following code was used to get this number:

               #include <stdio.h>

               #include <stdlib.h>

               #include <lib$routines.h>

               #include <starlet.h>

               main()

               {

                 unsigned long systime[2];

                 unsigned short epoch_values[7] =

                   { 1970, 1, 1, 0, 0, 0, 0 };

                 lib$cvt_vectim(epoch_values, systime);

                 printf("%u %u", systime[0], systime[1]);

               }

            */

            unsigned long unix_epoch[2] = { 1273708544, 8164711 };

            unsigned long deltatime[2];

            unsigned long systime[2];

            struct vms_vectime {

                short year, month, day, hour, minute, second, centi_second;

            } time_values;

            long operation;

            /*

             * Turn the number of seconds since January 1st 1970 to an

             * internal delta time. Note that lib$cvt_to_internal_time() will

             * assume that t is signed, and will therefore break on 32-bit

             * systems some time in 2038.

             */

            operation = LIB$K_DELTA_SECONDS;

            status = lib$cvt_to_internal_time(&operation, &t, deltatime);

            /*

             * Add the delta time with the Unix epoch and we have the current

             * UTC time in internal format

             */

            status = lib$add_times(unix_epoch, deltatime, systime);

            /* Turn the internal time into a time vector */

            status = sys$numtim(&time_values, systime);

            /* Fill in the struct tm with the result */

            result->tm_sec = time_values.second;

            result->tm_min = time_values.minute;

            result->tm_hour = time_values.hour;

            result->tm_mday = time_values.day;

            result->tm_mon = time_values.month - 1;

            result->tm_year = time_values.year - 1900;

            operation = LIB$K_DAY_OF_WEEK;

            status = lib$cvt_from_internal_time(&operation,

                                                &result->tm_wday, systime);

            result->tm_wday %= 7;

            operation = LIB$K_DAY_OF_YEAR;

            status = lib$cvt_from_internal_time(&operation,

                                                &result->tm_yday, systime);

            result->tm_yday--;

            result->tm_isdst = 0; /* There's no way to know... */

            ts = result;

        }

    }

#endif

    return ts;

}

/*

 * Take a tm structure and add an offset to it. This avoids any OS issues

 * with restricted date types and overflows which cause the year 2038

 * problem.

 */

#define SECS_PER_DAY (24 * 60 * 60)

static long date_to_julian(int y, int m, int d);

static void julian_to_date(long jd, int *y, int *m, int *d);

static int julian_adj(const struct tm *tm, int off_day, long offset_sec,

                      long *pday, int *psec);

int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)

{

    int time_sec, time_year, time_month, time_day;

    long time_jd;

    /* Convert time and offset into julian day and seconds */

    if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))

        return 0;

    /* Convert Julian day back to date */

    julian_to_date(time_jd, &time_year, &time_month, &time_day);

    if (time_year < 1900 || time_year > 9999)

        return 0;

    /* Update tm structure */

    tm->tm_year = time_year - 1900;

    tm->tm_mon = time_month - 1;

    tm->tm_mday = time_day;

    tm->tm_hour = time_sec / 3600;

    tm->tm_min = (time_sec / 60) % 60;

    tm->tm_sec = time_sec % 60;

    return 1;

}

int OPENSSL_gmtime_diff(int *pday, int *psec,

                        const struct tm *from, const struct tm *to)

{

    int from_sec, to_sec, diff_sec;

    long from_jd, to_jd, diff_day;

    if (!julian_adj(from, 0, 0, &from_jd, &from_sec))

        return 0;

    if (!julian_adj(to, 0, 0, &to_jd, &to_sec))

        return 0;

    diff_day = to_jd - from_jd;

    diff_sec = to_sec - from_sec;

    /* Adjust differences so both positive or both negative */

    if (diff_day > 0 && diff_sec < 0) {

        diff_day--;

        diff_sec += SECS_PER_DAY;

    }

    if (diff_day < 0 && diff_sec > 0) {

        diff_day++;

        diff_sec -= SECS_PER_DAY;

    }

    if (pday)

        *pday = (int)diff_day;

    if (psec)

        *psec = diff_sec;

    return 1;

}

/* Convert tm structure and offset into julian day and seconds */

static int julian_adj(const struct tm *tm, int off_day, long offset_sec,

                      long *pday, int *psec)

{

    int offset_hms, offset_day;

    long time_jd;

    int time_year, time_month, time_day;

    /* split offset into days and day seconds */

    offset_day = offset_sec / SECS_PER_DAY;

    /* Avoid sign issues with % operator */

    offset_hms = offset_sec - (offset_day * SECS_PER_DAY);

    offset_day += off_day;

    /* Add current time seconds to offset */

    offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;

    /* Adjust day seconds if overflow */

    if (offset_hms >= SECS_PER_DAY) {

        offset_day++;

        offset_hms -= SECS_PER_DAY;

    } else if (offset_hms < 0) {

        offset_day--;

        offset_hms += SECS_PER_DAY;

    }

    /*

     * Convert date of time structure into a Julian day number.

     */

    time_year = tm->tm_year + 1900;

    time_month = tm->tm_mon + 1;

    time_day = tm->tm_mday;

    time_jd = date_to_julian(time_year, time_month, time_day);

    /* Work out Julian day of new date */

    time_jd += offset_day;

    if (time_jd < 0)

        return 0;

    *pday = time_jd;

    *psec = offset_hms;

    return 1;

}

/*

 * Convert date to and from julian day Uses Fliegel & Van Flandern algorithm

 */

static long date_to_julian(int y, int m, int d)

{

    return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +

        (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -

        (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;

}

static void julian_to_date(long jd, int *y, int *m, int *d)

{

    long L = jd + 68569;

    long n = (4 * L) / 146097;

    long i, j;

    L = L - (146097 * n + 3) / 4;

    i = (4000 * (L + 1)) / 1461001;

    L = L - (1461 * i) / 4 + 31;

    j = (80 * L) / 2447;

    *d = L - (2447 * j) / 80;

    L = j / 11;

    *m = j + 2 - (12 * L);

    *y = 100 * (n - 49) + i + L;

}

#ifdef OPENSSL_TIME_TEST

# include <stdio.h>

/*

 * Time checking test code. Check times are identical for a wide range of

 * offsets. This should be run on a machine with 64 bit time_t or it will

 * trigger the very errors the routines fix.

 */

int main(int argc, char **argv)

{

    long offset;

    for (offset = 0; offset < 1000000; offset++) {

        check_time(offset);

        check_time(-offset);

        check_time(offset * 1000);

        check_time(-offset * 1000);

    }

}

int check_time(long offset)

{

    struct tm tm1, tm2, o1;

    int off_day, off_sec;

    long toffset;

    time_t t1, t2;

    time(&t1);

    t2 = t1 + offset;

    OPENSSL_gmtime(&t2, &tm2);

    OPENSSL_gmtime(&t1, &tm1);

    o1 = tm1;

    OPENSSL_gmtime_adj(&tm1, 0, offset);

    if ((tm1.tm_year != tm2.tm_year) ||

        (tm1.tm_mon != tm2.tm_mon) ||

        (tm1.tm_mday != tm2.tm_mday) ||

        (tm1.tm_hour != tm2.tm_hour) ||

        (tm1.tm_min != tm2.tm_min) || (tm1.tm_sec != tm2.tm_sec)) {

        fprintf(stderr, "TIME ERROR!!\n");

        fprintf(stderr, "Time1: %d/%d/%d, %d:%02d:%02d\n",

                tm2.tm_mday, tm2.tm_mon + 1, tm2.tm_year + 1900,

                tm2.tm_hour, tm2.tm_min, tm2.tm_sec);

        fprintf(stderr, "Time2: %d/%d/%d, %d:%02d:%02d\n",

                tm1.tm_mday, tm1.tm_mon + 1, tm1.tm_year + 1900,

                tm1.tm_hour, tm1.tm_min, tm1.tm_sec);

        return 0;

    }

    OPENSSL_gmtime_diff(&o1, &tm1, &off_day, &off_sec);

    toffset = (long)off_day *SECS_PER_DAY + off_sec;

    if (offset != toffset) {

        fprintf(stderr, "TIME OFFSET ERROR!!\n");

        fprintf(stderr, "Expected %ld, Got %ld (%d:%d)\n",

                offset, toffset, off_day, off_sec);

        return 0;

    }

    return 1;

}

#endif