Code cleanup: remove the VMS specific reimplementation of gmtime

  *)

  *) Remove the VMS-specific reimplementation of gmtime from crypto/o_times.c.

     VMS C's RTL has a fully up to date gmtime() and gmtime_r() since V7.1,

     which is the minimum version we support.

     [Richard Levitte]

 Changes between 1.1.0d and 1.1.0e [16 Feb 2017]

  *) Encrypt-Then-Mac renegotiation crash

#include <string.h>

#include <openssl/crypto.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_VMS) || defined(gmtime_r)) && !defined(OPENSSL_SYS_MACOSX)

#if defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_MACOSX)

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

        return NULL;

    ts = result;

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

#else

    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 tenths 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;

}