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Diffstat (limited to 'common/mischelp.c')
| -rw-r--r-- | common/mischelp.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/common/mischelp.c b/common/mischelp.c new file mode 100644 index 0000000..ee85002 --- /dev/null +++ b/common/mischelp.c @@ -0,0 +1,205 @@ +/* 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*/ |