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common: New functions timegm_u64, isotime2epoch_u64.

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* common/mischelp.c (timegm): Move to ...
* common/gettime.c (timegm): here.  On Windows use timegm_u32.
(timegm_u32): New.
(isotime2epoch): Factor code out to ...
(isotime_make_tm): new helper.
(isotime2epoch_u64): New.
(_win32_timegm): Remove duplicated code.
(parse_timestamp): Use of timegm.
(scan_isodatestr): Fallback to isotime2epoch_u64.
--

This mainly helps on 32 bit Windows.  For Unix we assume everyone is
using 64 bit or shall wait until the libc hackers finally provide a
time64_t.

GnuPG-bug-id: 6736
This commit is contained in:
Werner Koch 2023-10-26 09:59:40 +02:00
parent 2c3c049fd8
commit 164c687cb6
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
4 changed files with 176 additions and 154 deletions
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239
common/gettime.c
View File

@ -37,6 +37,10 @@
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef HAVE_W32_SYSTEM
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#endif /*!HAVE_W32_SYSTEM*/
#include <stdint.h> /* We use uint64_t. */
#include "util.h"
@ -62,6 +66,111 @@ static enum { NORMAL = 0, FROZEN, FUTURE, PAST } timemode;
#define JD_DIFF 1721060L
/*
timegm() is a GNU function that might not be available everywhere.
It's basically the inverse of gmtime() - you give it a struct tm,
and get back a time_t. It differs from mktime() in that it handles
the case where the struct tm is UTC and the local environment isn't.
Note, that this replacement implementation might not be thread-safe!
Some BSDs don't handle the putenv("foo") case properly, so we use
unsetenv if the platform has it to remove environment variables.
*/
#ifndef HAVE_TIMEGM
time_t
timegm (struct tm *tm)
{
#ifdef HAVE_W32_SYSTEM
uint64_t val = timegm_u64 (tm);
if (val == (uint64_t)(-1))
return (time_t)(-1);
return (time_t)val;
#else /* (Non thread safe implementation!) */
time_t answer;
char *zone;
zone=getenv("TZ");
putenv("TZ=UTC");
tzset();
answer=mktime(tm);
if(zone)
{
static char *old_zone;
if (!old_zone)
{
old_zone = malloc(3+strlen(zone)+1);
if (old_zone)
{
strcpy(old_zone,"TZ=");
strcat(old_zone,zone);
}
}
if (old_zone)
putenv (old_zone);
}
else
gnupg_unsetenv("TZ");
tzset();
return answer;
#endif
}
#endif /*!HAVE_TIMEGM*/
/* Version of the GNU timegm which returns an unsigned 64 bit integer
* instead of the usually signed time_t. On error (uint64_t)(-1) is
* returned. This function is mostly here becuase on 32 bit Windows
* we have an internal API to get the system time even after
* 2023-01-19. For 32 bit Unix we need to suffer from the too short
* time_t and no system function to construct the time from a tm. */
uint64_t
timegm_u64 (struct tm *tm)
{
#ifdef HAVE_W32_SYSTEM
/* This one is thread safe. */
SYSTEMTIME st;
FILETIME ft;
unsigned long long cnsecs;
st.wYear = tm->tm_year + 1900;
st.wMonth = tm->tm_mon + 1;
st.wDay = tm->tm_mday;
st.wHour = tm->tm_hour;
st.wMinute = tm->tm_min;
st.wSecond = tm->tm_sec;
st.wMilliseconds = 0; /* Not available. */
st.wDayOfWeek = 0; /* Ignored. */
/* System time is UTC thus the conversion is pretty easy. */
if (!SystemTimeToFileTime (&st, &ft))
{
gpg_err_set_errno (EINVAL);
return (uint64_t)(-1);
}
cnsecs = (((unsigned long long)ft.dwHighDateTime << 32)
| ft.dwLowDateTime);
cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01. */
return (uint64_t)(cnsecs / 10000000ULL);
#else /*Unix*/
time_t t = timegm (tm);
if (t == (time_t)(-1))
return (uint64_t)(-1);
if ((int64_t)t < 0)
return (uint64_t)(-1);
return (uint64_t)t;
#endif /*Unix*/
}
/* Wrapper for the time(3). We use this here so we can fake the time
for tests */
time_t
@ -231,7 +340,21 @@ scan_isodatestr( const char *string )
tmbuf.tm_isdst = -1;
stamp = mktime( &tmbuf );
if( stamp == (time_t)-1 )
return 0;
{
/* mktime did not work. Construct an ISO timestring for noon
* of the given day instead. We keep the use of mktime for 64
* bit system to limit the risk of regressions. */
gnupg_isotime_t isobuf;
uint64_t tmp64;
snprintf (isobuf, 16, "%04d%02d%02dT120000", year, month, day);
tmp64 = isotime2epoch_u64 (isobuf);
if (tmp64 == (uint64_t)(-1))
return 0; /* Error. */
if (tmp64 >= (u32)(-1))
return 0; /* Error. */
return (u32)tmp64;
}
return stamp;
}
@ -386,18 +509,14 @@ string2isotime (gnupg_isotime_t atime, const char *string)
}
/* Scan an ISO timestamp and return an Epoch based timestamp. The
only supported format is "yyyymmddThhmmss[Z]" delimited by white
space, nul, a colon or a comma. Returns (time_t)(-1) for an
invalid string. */
time_t
isotime2epoch (const char *string)
/* Helper for isotime2epoch. Returns 0 on success. */
static int
isotime_make_tm (const char *string, struct tm *tmbuf)
{
int year, month, day, hour, minu, sec;
struct tm tmbuf;
if (!isotime_p (string))
return (time_t)(-1);
return -1;
year = atoi_4 (string);
month = atoi_2 (string + 4);
@ -409,20 +528,48 @@ isotime2epoch (const char *string)
/* Basic checks. */
if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31
|| hour > 23 || minu > 59 || sec > 61 )
return -1;
memset (tmbuf, 0, sizeof *tmbuf);
tmbuf->tm_sec = sec;
tmbuf->tm_min = minu;
tmbuf->tm_hour = hour;
tmbuf->tm_mday = day;
tmbuf->tm_mon = month-1;
tmbuf->tm_year = year - 1900;
tmbuf->tm_isdst = -1;
return 0;
}
/* Scan an ISO timestamp and return an Epoch based timestamp. The
only supported format is "yyyymmddThhmmss[Z]" delimited by white
space, nul, a colon or a comma. Returns (time_t)(-1) for an
invalid string. */
time_t
isotime2epoch (const char *string)
{
struct tm tmbuf;
if (isotime_make_tm (string, &tmbuf))
return (time_t)(-1);
memset (&tmbuf, 0, sizeof tmbuf);
tmbuf.tm_sec = sec;
tmbuf.tm_min = minu;
tmbuf.tm_hour = hour;
tmbuf.tm_mday = day;
tmbuf.tm_mon = month-1;
tmbuf.tm_year = year - 1900;
tmbuf.tm_isdst = -1;
return timegm (&tmbuf);
}
uint64_t
isotime2epoch_u64 (const char *string)
{
struct tm tmbuf;
if (isotime_make_tm (string, &tmbuf))
return (uint64_t)(-1);
return timegm_u64 (&tmbuf);
}
/* Convert an Epoch time to an iso time stamp. */
void
epoch2isotime (gnupg_isotime_t timebuf, time_t atime)
@ -476,41 +623,6 @@ isodate_human_to_tm (const char *string, struct tm *t)
}
/* This function is a copy of gpgme/src/conversion.c:_gpgme_timegm.
If you change it, then update the other one too. */
#ifdef HAVE_W32_SYSTEM
static time_t
_win32_timegm (struct tm *tm)
{
/* This one is thread safe. */
SYSTEMTIME st;
FILETIME ft;
unsigned long long cnsecs;
st.wYear = tm->tm_year + 1900;
st.wMonth = tm->tm_mon + 1;
st.wDay = tm->tm_mday;
st.wHour = tm->tm_hour;
st.wMinute = tm->tm_min;
st.wSecond = tm->tm_sec;
st.wMilliseconds = 0; /* Not available. */
st.wDayOfWeek = 0; /* Ignored. */
/* System time is UTC thus the conversion is pretty easy. */
if (!SystemTimeToFileTime (&st, &ft))
{
gpg_err_set_errno (EINVAL);
return (time_t)(-1);
}
cnsecs = (((unsigned long long)ft.dwHighDateTime << 32)
| ft.dwLowDateTime);
cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01. */
return (time_t)(cnsecs / 10000000ULL);
}
#endif
/* Parse the string TIMESTAMP into a time_t. The string may either be
seconds since Epoch or in the ISO 8601 format like
"20390815T143012". Returns 0 for an empty string or seconds since
@ -519,7 +631,11 @@ _win32_timegm (struct tm *tm)
This function is a copy of
gpgme/src/conversion.c:_gpgme_parse_timestamp. If you change it,
then update the other one too. */
then update the other one too.
FIXME: Replace users of this function by one of the more modern
functions or change the return type to u64.
*/
time_t
parse_timestamp (const char *timestamp, char **endp)
{
@ -555,24 +671,7 @@ parse_timestamp (const char *timestamp, char **endp)
buf.tm_min = atoi_2 (timestamp+11);
buf.tm_sec = atoi_2 (timestamp+13);
#ifdef HAVE_W32_SYSTEM
return _win32_timegm (&buf);
#else
#ifdef HAVE_TIMEGM
return timegm (&buf);
#else
{
time_t tim;
putenv ("TZ=UTC");
tim = mktime (&buf);
#ifdef __GNUC__
#warning fixme: we must somehow reset TZ here. It is not threadsafe anyway.
#endif
return tim;
}
#endif /* !HAVE_TIMEGM */
#endif /* !HAVE_W32_SYSTEM */
}
else
return (time_t)strtoul (timestamp, endp, 10);

8
common/gettime.h
View File

@ -32,7 +32,7 @@
#include <time.h> /* We need time_t. */
#include <gpg-error.h> /* We need gpg_error_t. */
#include <stdint.h> /* We use uint64_t. */
/* A type to hold the ISO time. Note that this is the same as
the KSBA type ksba_isotime_t. */
@ -43,6 +43,11 @@ typedef char gnupg_isotime_t[16];
#define GNUPG_ISOTIME_NONE \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
#ifndef HAVE_TIMEGM
time_t timegm (struct tm *tm);
#endif /*!HAVE_TIMEGM*/
uint64_t timegm_u64 (struct tm *tm);
time_t gnupg_get_time (void);
struct tm *gnupg_gmtime (const time_t *timep, struct tm *result);
void gnupg_get_isotime (gnupg_isotime_t timebuf);
@ -57,6 +62,7 @@ int isotime_p (const char *string);
int isotime_human_p (const char *string, int date_only);
size_t string2isotime (gnupg_isotime_t atime, const char *string);
time_t isotime2epoch (const char *string);
uint64_t isotime2epoch_u64 (const char *string);
void epoch2isotime (gnupg_isotime_t timebuf, time_t atime);
int isodate_human_to_tm (const char *string, struct tm *t);
time_t parse_timestamp (const char *timestamp, char **endp);

77
common/mischelp.c
View File

@ -126,80 +126,3 @@ same_file_p (const char *name1, const char *name2)
}
return yes;
}
/*
timegm() is a GNU function that might not be available everywhere.
It's basically the inverse of gmtime() - you give it a struct tm,
and get back a time_t. It differs from mktime() in that it handles
the case where the struct tm is UTC and the local environment isn't.
Note, that this replacement implementation might not be thread-safe!
Some BSDs don't handle the putenv("foo") case properly, so we use
unsetenv if the platform has it to remove environment variables.
*/
#ifndef HAVE_TIMEGM
time_t
timegm (struct tm *tm)
{
#ifdef HAVE_W32_SYSTEM
/* This one is thread safe. */
SYSTEMTIME st;
FILETIME ft;
unsigned long long cnsecs;
st.wYear = tm->tm_year + 1900;
st.wMonth = tm->tm_mon + 1;
st.wDay = tm->tm_mday;
st.wHour = tm->tm_hour;
st.wMinute = tm->tm_min;
st.wSecond = tm->tm_sec;
st.wMilliseconds = 0; /* Not available. */
st.wDayOfWeek = 0; /* Ignored. */
/* System time is UTC thus the conversion is pretty easy. */
if (!SystemTimeToFileTime (&st, &ft))
{
gpg_err_set_errno (EINVAL);
return (time_t)(-1);
}
cnsecs = (((unsigned long long)ft.dwHighDateTime << 32)
| ft.dwLowDateTime);
cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01. */
return (time_t)(cnsecs / 10000000ULL);
#else /* (Non thread safe implementation!) */
time_t answer;
char *zone;
zone=getenv("TZ");
putenv("TZ=UTC");
tzset();
answer=mktime(tm);
if(zone)
{
static char *old_zone;
if (!old_zone)
{
old_zone = malloc(3+strlen(zone)+1);
if (old_zone)
{
strcpy(old_zone,"TZ=");
strcat(old_zone,zone);
}
}
if (old_zone)
putenv (old_zone);
}
else
gnupg_unsetenv("TZ");
tzset();
return answer;
#endif
}
#endif /*!HAVE_TIMEGM*/

6
common/mischelp.h
View File

@ -38,12 +38,6 @@
int same_file_p (const char *name1, const char *name2);
#ifndef HAVE_TIMEGM
#include <time.h>
time_t timegm (struct tm *tm);
#endif /*!HAVE_TIMEGM*/
#define DIM(v) (sizeof(v)/sizeof((v)[0]))
#define DIMof(type,member) DIM(((type *)0)->member)