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time-cond: fix reading the file modification time on Windows 

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
This commit is contained in:
Michael Kaufmann 2018-02-05 21:57:39 +01:00
Родитель 84ad1fd304
Коммит d25b050379
6 изменённых файлов: 210 добавлений и 98 удалений
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2
src/Makefile.inc
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@ -37,6 +37,7 @@ CURL_CFILES = \
tool_dirhie.c \
tool_doswin.c \
tool_easysrc.c \
tool_filetime.c \
tool_formparse.c \
tool_getparam.c \
tool_getpass.c \
@ -77,6 +78,7 @@ CURL_HFILES = \
tool_dirhie.h \
tool_doswin.h \
tool_easysrc.h \
tool_filetime.h \
tool_formparse.h \
tool_getparam.h \
tool_getpass.h \

2
src/tool_cfgable.h
Просмотреть файл

@ -169,7 +169,7 @@ struct OperationConfig {
long proxy_ssl_version;
long ip_version;
curl_TimeCond timecond;
time_t condtime;
curl_off_t condtime;
struct curl_slist *headers;
struct curl_slist *proxyheaders;
curl_mime *mimepost;

154
src/tool_filetime.c Normal file
Просмотреть файл

@ -0,0 +1,154 @@
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "tool_filetime.h"
#ifdef HAVE_UTIME_H
# include <utime.h>
#elif defined(HAVE_SYS_UTIME_H)
# include <sys/utime.h>
#endif
curl_off_t getfiletime(const char *filename, FILE *error_stream)
{
curl_off_t result = -1;
/* Windows stat() may attempt to adjust the unix GMT file time by a daylight
saving time offset and since it's GMT that is bad behavior. When we have
access to a 64-bit type we can bypass stat and get the times directly. */
#if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
HANDLE hfile;
hfile = CreateFileA(filename, FILE_READ_ATTRIBUTES,
(FILE_SHARE_READ | FILE_SHARE_WRITE |
FILE_SHARE_DELETE),
NULL, OPEN_EXISTING, 0, NULL);
if(hfile != INVALID_HANDLE_VALUE) {
FILETIME ft;
if(GetFileTime(hfile, NULL, NULL, &ft)) {
curl_off_t converted = (curl_off_t)ft.dwLowDateTime
| ((curl_off_t)ft.dwHighDateTime) << 32;
if(converted < CURL_OFF_T_C(116444736000000000)) {
fprintf(error_stream,
"Failed to get filetime: underflow\n");
}
else {
result = (converted - CURL_OFF_T_C(116444736000000000)) / 10000000;
}
}
else {
fprintf(error_stream,
"Failed to get filetime: "
"GetFileTime failed: GetLastError %u\n",
(unsigned int)GetLastError());
}
CloseHandle(hfile);
}
else if(GetLastError() != ERROR_FILE_NOT_FOUND) {
fprintf(error_stream,
"Failed to get filetime: "
"CreateFile failed: GetLastError %u\n",
(unsigned int)GetLastError());
}
#else
struct_stat statbuf;
if(-1 != stat(filename, &statbuf)) {
result = (curl_off_t)statbuf.st_mtime;
}
else if(errno != ENOENT) {
fprintf(error_stream,
"Failed to get filetime: %s\n", strerror(errno));
}
#endif
return result;
}
#if defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
void setfiletime(curl_off_t filetime, const char *filename,
FILE *error_stream)
{
if(filetime >= 0) {
/* Windows utime() may attempt to adjust the unix GMT file time by a daylight
saving time offset and since it's GMT that is bad behavior. When we have
access to a 64-bit type we can bypass utime and set the times directly. */
#if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
HANDLE hfile;
/* 910670515199 is the maximum unix filetime that can be used as a
Windows FILETIME without overflow: 30827-12-31T23:59:59. */
if(filetime > CURL_OFF_T_C(910670515199)) {
fprintf(error_stream,
"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
" on outfile: overflow\n", filetime);
return;
}
hfile = CreateFileA(filename, FILE_WRITE_ATTRIBUTES,
(FILE_SHARE_READ | FILE_SHARE_WRITE |
FILE_SHARE_DELETE),
NULL, OPEN_EXISTING, 0, NULL);
if(hfile != INVALID_HANDLE_VALUE) {
curl_off_t converted = ((curl_off_t)filetime * 10000000) +
CURL_OFF_T_C(116444736000000000);
FILETIME ft;
ft.dwLowDateTime = (DWORD)(converted & 0xFFFFFFFF);
ft.dwHighDateTime = (DWORD)(converted >> 32);
if(!SetFileTime(hfile, NULL, &ft, &ft)) {
fprintf(error_stream,
"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
" on outfile: SetFileTime failed: GetLastError %u\n",
filetime, (unsigned int)GetLastError());
}
CloseHandle(hfile);
}
else {
fprintf(error_stream,
"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
" on outfile: CreateFile failed: GetLastError %u\n",
filetime, (unsigned int)GetLastError());
}
#elif defined(HAVE_UTIMES)
struct timeval times[2];
times[0].tv_sec = times[1].tv_sec = (time_t)filetime;
times[0].tv_usec = times[1].tv_usec = 0;
if(utimes(filename, times)) {
fprintf(error_stream,
"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
" on outfile: %s\n", filetime, strerror(errno));
}
#elif defined(HAVE_UTIME)
struct utimbuf times;
times.actime = (time_t)filetime;
times.modtime = (time_t)filetime;
if(utime(filename, &times)) {
fprintf(error_stream,
"Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
" on outfile: %s\n", filetime, strerror(errno));
}
#endif
}
}
#endif /* defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */

38
src/tool_filetime.h Normal file
Просмотреть файл

@ -0,0 +1,38 @@
#ifndef HEADER_CURL_TOOL_FILETIME_H
#define HEADER_CURL_TOOL_FILETIME_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "tool_setup.h"
curl_off_t getfiletime(const char *filename, FILE *error_stream);
#if defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
void setfiletime(curl_off_t filetime, const char *filename,
FILE *error_stream);
#else
#define setfiletime(a,b,c) Curl_nop_stmt
#endif /* defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */
#endif /* HEADER_CURL_TOOL_FILETIME_H */

17
src/tool_getparam.c
Просмотреть файл

@ -31,6 +31,7 @@
#include "tool_cfgable.h"
#include "tool_cb_prg.h"
#include "tool_convert.h"
#include "tool_filetime.h"
#include "tool_formparse.h"
#include "tool_getparam.h"
#include "tool_helpers.h"
@ -2087,11 +2088,15 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
break;
}
now = time(NULL);
config->condtime = curl_getdate(nextarg, &now);
if(-1 == (int)config->condtime) {
config->condtime = (curl_off_t)curl_getdate(nextarg, &now);
if(-1 == config->condtime) {
/* now let's see if it is a file name to get the time from instead! */
struct_stat statbuf;
if(-1 == stat(nextarg, &statbuf)) {
curl_off_t filetime = getfiletime(nextarg, config->global->errors);
if(filetime >= 0) {
/* pull the time out from the file */
config->condtime = filetime;
}
else {
/* failed, remove time condition */
config->timecond = CURL_TIMECOND_NONE;
warnf(global,
@ -2099,10 +2104,6 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
"a file name). Disabling time condition. "
"See curl_getdate(3) for valid date syntax.\n");
}
else {
/* pull the time out from the file */
config->condtime = statbuf.st_mtime;
}
}
break;
default: /* unknown flag */

95
src/tool_operate.c
Просмотреть файл

@ -25,12 +25,6 @@
# include <fcntl.h>
#endif
#ifdef HAVE_UTIME_H
# include <utime.h>
#elif defined(HAVE_SYS_UTIME_H)
# include <sys/utime.h>
#endif
#ifdef HAVE_LOCALE_H
# include <locale.h>
#endif
@ -56,6 +50,7 @@
#include "tool_dirhie.h"
#include "tool_doswin.h"
#include "tool_easysrc.h"
#include "tool_filetime.h"
#include "tool_getparam.h"
#include "tool_helpers.h"
#include "tool_homedir.h"
@ -174,79 +169,6 @@ static curl_off_t VmsSpecialSize(const char *name,
}
#endif /* __VMS */
#if defined(HAVE_UTIME) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
static void setfiletime(long filetime, const char *filename,
FILE *error_stream)
{
if(filetime >= 0) {
/* Windows utime() may attempt to adjust our unix gmt 'filetime' by a daylight
saving time offset and since it's GMT that is bad behavior. When we have
access to a 64-bit type we can bypass utime and set the times directly. */
#if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
HANDLE hfile;
#if (SIZEOF_LONG >= 8)
/* 910670515199 is the maximum unix filetime that can be used as a
Windows FILETIME without overflow: 30827-12-31T23:59:59. */
if(filetime > CURL_OFF_T_C(910670515199)) {
fprintf(error_stream,
"Failed to set filetime %ld on outfile: overflow\n",
filetime);
return;
}
#endif /* SIZEOF_LONG >= 8 */
hfile = CreateFileA(filename, FILE_WRITE_ATTRIBUTES,
(FILE_SHARE_READ | FILE_SHARE_WRITE |
FILE_SHARE_DELETE),
NULL, OPEN_EXISTING, 0, NULL);
if(hfile != INVALID_HANDLE_VALUE) {
curl_off_t converted = ((curl_off_t)filetime * 10000000) +
CURL_OFF_T_C(116444736000000000);
FILETIME ft;
ft.dwLowDateTime = (DWORD)(converted & 0xFFFFFFFF);
ft.dwHighDateTime = (DWORD)(converted >> 32);
if(!SetFileTime(hfile, NULL, &ft, &ft)) {
fprintf(error_stream,
"Failed to set filetime %ld on outfile: "
"SetFileTime failed: GetLastError %u\n",
filetime, GetLastError());
}
CloseHandle(hfile);
}
else {
fprintf(error_stream,
"Failed to set filetime %ld on outfile: "
"CreateFile failed: GetLastError %u\n",
filetime, GetLastError());
}
#elif defined(HAVE_UTIMES)
struct timeval times[2];
times[0].tv_sec = times[1].tv_sec = filetime;
times[0].tv_usec = times[1].tv_usec = 0;
if(utimes(filename, times)) {
fprintf(error_stream,
"Failed to set filetime %ld on outfile: errno %d\n",
filetime, errno);
}
#elif defined(HAVE_UTIME)
struct utimbuf times;
times.actime = (time_t)filetime;
times.modtime = (time_t)filetime;
if(utime(filename, &times)) {
fprintf(error_stream,
"Failed to set filetime %ld on outfile: errno %d\n",
filetime, errno);
}
#endif
}
}
#endif /* defined(HAVE_UTIME) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */
#define BUFFER_SIZE (100*1024)
static CURLcode operate_do(struct GlobalConfig *global,
@ -710,7 +632,7 @@ static CURLcode operate_do(struct GlobalConfig *global,
* to be considered with one appended if implied CC
*/
#ifdef __VMS
/* Calculate the real upload site for VMS */
/* Calculate the real upload size for VMS */
infd = -1;
if(stat(uploadfile, &fileinfo) == 0) {
fileinfo.st_size = VmsSpecialSize(uploadfile, &fileinfo);
@ -1232,7 +1154,7 @@ static CURLcode operate_do(struct GlobalConfig *global,
#endif
my_setopt_enum(curl, CURLOPT_TIMECONDITION, (long)config->timecond);
my_setopt(curl, CURLOPT_TIMEVALUE, (long)config->condtime);
my_setopt(curl, CURLOPT_TIMEVALUE_LARGE, config->condtime);
my_setopt_str(curl, CURLOPT_CUSTOMREQUEST, config->customrequest);
customrequest_helper(config, config->httpreq, config->customrequest);
my_setopt(curl, CURLOPT_STDERR, global->errors);
@ -1841,18 +1763,13 @@ static CURLcode operate_do(struct GlobalConfig *global,
}
#endif
#if defined(HAVE_UTIME) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
/* File time can only be set _after_ the file has been closed */
if(!result && config->remote_time && outs.s_isreg && outs.filename) {
/* Ask libcurl if we got a remote file time */
long filetime = -1;
curl_easy_getinfo(curl, CURLINFO_FILETIME, &filetime);
if(filetime >= 0)
setfiletime(filetime, outs.filename, config->global->errors);
curl_off_t filetime = -1;
curl_easy_getinfo(curl, CURLINFO_FILETIME_T, &filetime);
setfiletime(filetime, outs.filename, config->global->errors);
}
#endif /* defined(HAVE_UTIME) || \
(defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */
#ifdef USE_METALINK
if(!metalink && config->use_metalink && result == CURLE_OK) {