mirror of
https://github.com/moparisthebest/curl
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d25b050379
On Windows, stat() may adjust the unix file time by a daylight saving time offset. Avoid this by calling GetFileTime() instead. Fixes #2164 Closes #2204
155 lines
5.5 KiB
C
155 lines
5.5 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "tool_filetime.h"
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#ifdef HAVE_UTIME_H
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# include <utime.h>
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#elif defined(HAVE_SYS_UTIME_H)
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# include <sys/utime.h>
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#endif
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curl_off_t getfiletime(const char *filename, FILE *error_stream)
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{
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curl_off_t result = -1;
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/* Windows stat() may attempt to adjust the unix GMT file time by a daylight
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saving time offset and since it's GMT that is bad behavior. When we have
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access to a 64-bit type we can bypass stat and get the times directly. */
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#if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
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HANDLE hfile;
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hfile = CreateFileA(filename, FILE_READ_ATTRIBUTES,
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(FILE_SHARE_READ | FILE_SHARE_WRITE |
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FILE_SHARE_DELETE),
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NULL, OPEN_EXISTING, 0, NULL);
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if(hfile != INVALID_HANDLE_VALUE) {
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FILETIME ft;
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if(GetFileTime(hfile, NULL, NULL, &ft)) {
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curl_off_t converted = (curl_off_t)ft.dwLowDateTime
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| ((curl_off_t)ft.dwHighDateTime) << 32;
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if(converted < CURL_OFF_T_C(116444736000000000)) {
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fprintf(error_stream,
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"Failed to get filetime: underflow\n");
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}
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else {
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result = (converted - CURL_OFF_T_C(116444736000000000)) / 10000000;
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}
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}
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else {
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fprintf(error_stream,
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"Failed to get filetime: "
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"GetFileTime failed: GetLastError %u\n",
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(unsigned int)GetLastError());
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}
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CloseHandle(hfile);
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}
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else if(GetLastError() != ERROR_FILE_NOT_FOUND) {
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fprintf(error_stream,
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"Failed to get filetime: "
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"CreateFile failed: GetLastError %u\n",
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(unsigned int)GetLastError());
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}
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#else
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struct_stat statbuf;
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if(-1 != stat(filename, &statbuf)) {
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result = (curl_off_t)statbuf.st_mtime;
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}
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else if(errno != ENOENT) {
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fprintf(error_stream,
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"Failed to get filetime: %s\n", strerror(errno));
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}
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#endif
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return result;
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}
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#if defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
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(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
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void setfiletime(curl_off_t filetime, const char *filename,
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FILE *error_stream)
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{
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if(filetime >= 0) {
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/* Windows utime() may attempt to adjust the unix GMT file time by a daylight
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saving time offset and since it's GMT that is bad behavior. When we have
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access to a 64-bit type we can bypass utime and set the times directly. */
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#if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
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HANDLE hfile;
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/* 910670515199 is the maximum unix filetime that can be used as a
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Windows FILETIME without overflow: 30827-12-31T23:59:59. */
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if(filetime > CURL_OFF_T_C(910670515199)) {
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fprintf(error_stream,
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"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
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" on outfile: overflow\n", filetime);
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return;
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}
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hfile = CreateFileA(filename, FILE_WRITE_ATTRIBUTES,
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(FILE_SHARE_READ | FILE_SHARE_WRITE |
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FILE_SHARE_DELETE),
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NULL, OPEN_EXISTING, 0, NULL);
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if(hfile != INVALID_HANDLE_VALUE) {
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curl_off_t converted = ((curl_off_t)filetime * 10000000) +
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CURL_OFF_T_C(116444736000000000);
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FILETIME ft;
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ft.dwLowDateTime = (DWORD)(converted & 0xFFFFFFFF);
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ft.dwHighDateTime = (DWORD)(converted >> 32);
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if(!SetFileTime(hfile, NULL, &ft, &ft)) {
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fprintf(error_stream,
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"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
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" on outfile: SetFileTime failed: GetLastError %u\n",
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filetime, (unsigned int)GetLastError());
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}
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CloseHandle(hfile);
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}
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else {
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fprintf(error_stream,
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"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
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" on outfile: CreateFile failed: GetLastError %u\n",
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filetime, (unsigned int)GetLastError());
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}
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#elif defined(HAVE_UTIMES)
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struct timeval times[2];
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times[0].tv_sec = times[1].tv_sec = (time_t)filetime;
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times[0].tv_usec = times[1].tv_usec = 0;
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if(utimes(filename, times)) {
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fprintf(error_stream,
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"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
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" on outfile: %s\n", filetime, strerror(errno));
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}
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#elif defined(HAVE_UTIME)
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struct utimbuf times;
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times.actime = (time_t)filetime;
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times.modtime = (time_t)filetime;
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if(utime(filename, ×)) {
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fprintf(error_stream,
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"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
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" on outfile: %s\n", filetime, strerror(errno));
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}
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#endif
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}
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}
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#endif /* defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
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(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */
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