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/* mischelp.c - Miscellaneous helper functions
* Copyright (C) 1998, 2000, 2001, 2006, 2007 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute and/or modify this
* part of GnuPG under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* or both in parallel, as here.
*
* GnuPG 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 copies of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_W32_SYSTEM
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#else /*!HAVE_W32_SYSTEM*/
# include <sys/types.h>
# include <sys/stat.h>
# include <unistd.h>
#endif /*!HAVE_W32_SYSTEM*/
#include <errno.h>
#include "util.h"
#include "common-defs.h"
#include "stringhelp.h"
#include "utf8conv.h"
#include "mischelp.h"
void
wipememory (void *ptr, size_t len)
{
#if defined(HAVE_W32_SYSTEM) && defined(SecureZeroMemory)
SecureZeroMemory (ptr, len);
#elif defined(HAVE_EXPLICIT_BZERO)
explicit_bzero (ptr, len);
#else
/* Prevent compiler from optimizing away the call to memset by accessing
memset through volatile pointer. */
static void *(*volatile memset_ptr)(void *, int, size_t) = (void *)memset;
memset_ptr (ptr, 0, len);
#endif
}
/* Check whether the files NAME1 and NAME2 are identical. This is for
example achieved by comparing the inode numbers of the files. */
int
same_file_p (const char *name1, const char *name2)
{
int yes;
/* First try a shortcut. */
if (!compare_filenames (name1, name2))
yes = 1;
else
{
#ifdef HAVE_W32_SYSTEM
HANDLE file1, file2;
BY_HANDLE_FILE_INFORMATION info1, info2;
wchar_t *wname;
wname = gpgrt_fname_to_wchar (name1);
if (wname)
{
file1 = CreateFileW (wname, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
xfree (wname);
}
else
file1 = INVALID_HANDLE_VALUE;
if (file1 == INVALID_HANDLE_VALUE)
yes = 0; /* If we can't open the file, it is not the same. */
else
{
wname = gpgrt_fname_to_wchar (name2);
if (wname)
{
file2 = CreateFileW (wname, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
xfree (wname);
}
else
file2 = INVALID_HANDLE_VALUE;
if (file2 == INVALID_HANDLE_VALUE)
yes = 0; /* If we can't open the file, it is not the same. */
else
{
yes = (GetFileInformationByHandle (file1, &info1)
&& GetFileInformationByHandle (file2, &info2)
&& info1.dwVolumeSerialNumber==info2.dwVolumeSerialNumber
&& info1.nFileIndexHigh == info2.nFileIndexHigh
&& info1.nFileIndexLow == info2.nFileIndexLow);
CloseHandle (file2);
}
CloseHandle (file1);
}
#else /*!HAVE_W32_SYSTEM*/
struct stat info1, info2;
yes = (!stat (name1, &info1) && !stat (name2, &info2)
&& info1.st_dev == info2.st_dev && info1.st_ino == info2.st_ino);
#endif /*!HAVE_W32_SYSTEM*/
}
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*/
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