378 lines
13 KiB
C
378 lines
13 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) 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.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* Set your system time from a remote HTTP server's Date: header.
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* </DESC>
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*/
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/* This example code only builds as-is on Windows.
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*
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* While Unix/Linux user, you do not need this software.
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* You can achieve the same result as synctime using curl, awk and date.
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* Set proxy as according to your network, but beware of proxy Cache-Control.
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*
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* To set your system clock, root access is required.
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* # date -s "`curl -sI https://nist.time.gov/timezone.cgi?UTC/s/0 \
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* | awk -F': ' '/Date: / {print $2}'`"
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*
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* To view remote webserver date and time.
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* $ curl -sI https://nist.time.gov/timezone.cgi?UTC/s/0 \
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* | awk -F': ' '/Date: / {print $2}'
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*
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* Synchronising your computer clock via Internet time server usually relies
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* on DAYTIME, TIME, or NTP protocols. These protocols provide good accurate
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* time synchronization but it does not work well through a
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* firewall/proxy. Some adjustment has to be made to the firewall/proxy for
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* these protocols to work properly.
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*
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* There is an indirect method. Since most webserver provide server time in
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* their HTTP header, therefore you could synchronise your computer clock
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* using HTTP protocol which has no problem with firewall/proxy.
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*
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* For this software to work, you should take note of these items.
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* 1. Your firewall/proxy must allow your computer to surf internet.
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* 2. Webserver system time must in sync with the NTP time server,
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* or at least provide an accurate time keeping.
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* 3. Webserver HTTP header does not provide the milliseconds units,
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* so there is no way to get an accurate time.
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* 4. This software could only provide an accuracy of +- a few seconds,
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* as Round-Trip delay time is not taken into consideration.
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* Compensation of network, firewall/proxy delay cannot be simply divide
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* the Round-Trip delay time by half.
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* 5. Win32 SetSystemTime() API will set your computer clock according to
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* GMT/UTC time. Therefore your computer timezone must be properly set.
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* 6. Webserver data should not be cached by the proxy server. Some
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* webserver provide Cache-Control to prevent caching.
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*
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* References:
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* https://web.archive.org/web/20100228012139/ \
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* tf.nist.gov/timefreq/service/its.htm
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* https://web.archive.org/web/20100409024302/ \
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* tf.nist.gov/timefreq/service/firewall.htm
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*
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* Usage:
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* This software will synchronise your computer clock only when you issue
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* it with --synctime. By default, it only display the webserver's clock.
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*
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* Written by: Frank (contributed to libcurl)
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL THE AUTHOR OF THIS SOFTWARE BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*
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*/
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#include <stdio.h>
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#include <time.h>
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#ifndef __CYGWIN__
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#include <winsock2.h>
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#include <windows.h>
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#endif
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#include <curl/curl.h>
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#define MAX_STRING 256
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#define MAX_STRING1 MAX_STRING + 1
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#define SYNCTIME_UA "synctime/1.0"
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typedef struct
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{
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char http_proxy[MAX_STRING1];
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char proxy_user[MAX_STRING1];
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char timeserver[MAX_STRING1];
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} conf_t;
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const char DefaultTimeServer[3][MAX_STRING1] =
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{
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"https://nist.time.gov/",
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"https://www.google.com/"
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};
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const char *DayStr[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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const char *MthStr[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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int ShowAllHeader;
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int AutoSyncTime;
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SYSTEMTIME SYSTime;
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SYSTEMTIME LOCALTime;
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#define HTTP_COMMAND_HEAD 0
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#define HTTP_COMMAND_GET 1
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size_t SyncTime_CURL_WriteOutput(void *ptr, size_t size, size_t nmemb,
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void *stream)
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{
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fwrite(ptr, size, nmemb, stream);
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return (nmemb*size);
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}
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size_t SyncTime_CURL_WriteHeader(void *ptr, size_t size, size_t nmemb,
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void *stream)
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{
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char TmpStr1[26], TmpStr2[26];
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(void)stream;
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if(ShowAllHeader == 1)
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fprintf(stderr, "%s", (char *)(ptr));
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if(strncmp((char *)(ptr), "Date:", 5) == 0) {
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if(ShowAllHeader == 0)
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fprintf(stderr, "HTTP Server. %s", (char *)(ptr));
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if(AutoSyncTime == 1) {
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*TmpStr1 = 0;
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*TmpStr2 = 0;
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if(strlen((char *)(ptr)) > 50) /* Can prevent buffer overflow to
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TmpStr1 & 2? */
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AutoSyncTime = 0;
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else {
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int RetVal = sscanf((char *)(ptr), "Date: %25s %hu %s %hu %hu:%hu:%hu",
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TmpStr1, &SYSTime.wDay, TmpStr2, &SYSTime.wYear,
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&SYSTime.wHour, &SYSTime.wMinute,
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&SYSTime.wSecond);
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if(RetVal == 7) {
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int i;
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SYSTime.wMilliseconds = 500; /* adjust to midpoint, 0.5 sec */
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for(i = 0; i<12; i++) {
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if(strcmp(MthStr[i], TmpStr2) == 0) {
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SYSTime.wMonth = i + 1;
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break;
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}
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}
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AutoSyncTime = 3; /* Computer clock will be adjusted */
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}
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else {
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AutoSyncTime = 0; /* Error in sscanf() fields conversion */
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}
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}
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}
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}
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if(strncmp((char *)(ptr), "X-Cache: HIT", 12) == 0) {
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fprintf(stderr, "ERROR: HTTP Server data is cached."
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" Server Date is no longer valid.\n");
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AutoSyncTime = 0;
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}
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return (nmemb*size);
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}
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void SyncTime_CURL_Init(CURL *curl, char *proxy_port,
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char *proxy_user_password)
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{
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if(strlen(proxy_port) > 0)
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curl_easy_setopt(curl, CURLOPT_PROXY, proxy_port);
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if(strlen(proxy_user_password) > 0)
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curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, proxy_user_password);
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#ifdef SYNCTIME_UA
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curl_easy_setopt(curl, CURLOPT_USERAGENT, SYNCTIME_UA);
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#endif
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, SyncTime_CURL_WriteOutput);
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curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, SyncTime_CURL_WriteHeader);
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}
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int SyncTime_CURL_Fetch(CURL *curl, char *URL_Str, char *OutFileName,
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int HttpGetBody)
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{
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FILE *outfile;
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CURLcode res;
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outfile = NULL;
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if(HttpGetBody == HTTP_COMMAND_HEAD)
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curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
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else {
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outfile = fopen(OutFileName, "wb");
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
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}
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curl_easy_setopt(curl, CURLOPT_URL, URL_Str);
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res = curl_easy_perform(curl);
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if(outfile)
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fclose(outfile);
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return res; /* (CURLE_OK) */
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}
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void showUsage(void)
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{
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fprintf(stderr, "SYNCTIME: Synchronising computer clock with time server"
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" using HTTP protocol.\n");
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fprintf(stderr, "Usage : SYNCTIME [Option]\n");
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fprintf(stderr, "Options :\n");
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fprintf(stderr, " --server=WEBSERVER Use this time server instead"
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" of default.\n");
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fprintf(stderr, " --showall Show all HTTP header.\n");
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fprintf(stderr, " --synctime Synchronising computer clock"
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" with time server.\n");
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fprintf(stderr, " --proxy-user=USER[:PASS] Set proxy username and"
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" password.\n");
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fprintf(stderr, " --proxy=HOST[:PORT] Use HTTP proxy on given"
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" port.\n");
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fprintf(stderr, " --help Print this help.\n");
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fprintf(stderr, "\n");
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return;
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}
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int conf_init(conf_t *conf)
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{
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int i;
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*conf->http_proxy = 0;
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for(i = 0; i<MAX_STRING1; i++)
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conf->proxy_user[i] = 0; /* Clean up password from memory */
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*conf->timeserver = 0;
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return 1;
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}
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int main(int argc, char *argv[])
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{
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CURL *curl;
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conf_t conf[1];
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int RetValue;
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ShowAllHeader = 0; /* Do not show HTTP Header */
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AutoSyncTime = 0; /* Do not synchronise computer clock */
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RetValue = 0; /* Successful Exit */
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conf_init(conf);
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if(argc > 1) {
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int OptionIndex = 0;
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while(OptionIndex < argc) {
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if(strncmp(argv[OptionIndex], "--server=", 9) == 0)
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snprintf(conf->timeserver, MAX_STRING, "%s", &argv[OptionIndex][9]);
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if(strcmp(argv[OptionIndex], "--showall") == 0)
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ShowAllHeader = 1;
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if(strcmp(argv[OptionIndex], "--synctime") == 0)
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AutoSyncTime = 1;
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if(strncmp(argv[OptionIndex], "--proxy-user=", 13) == 0)
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snprintf(conf->proxy_user, MAX_STRING, "%s", &argv[OptionIndex][13]);
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if(strncmp(argv[OptionIndex], "--proxy=", 8) == 0)
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snprintf(conf->http_proxy, MAX_STRING, "%s", &argv[OptionIndex][8]);
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if((strcmp(argv[OptionIndex], "--help") == 0) ||
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(strcmp(argv[OptionIndex], "/?") == 0)) {
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showUsage();
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return 0;
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}
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OptionIndex++;
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}
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}
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if(*conf->timeserver == 0) /* Use default server for time information */
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snprintf(conf->timeserver, MAX_STRING, "%s", DefaultTimeServer[0]);
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/* Init CURL before usage */
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curl_global_init(CURL_GLOBAL_ALL);
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curl = curl_easy_init();
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if(curl) {
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struct tm *lt;
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struct tm *gmt;
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time_t tt;
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time_t tt_local;
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time_t tt_gmt;
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double tzonediffFloat;
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int tzonediffWord;
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char timeBuf[61];
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char tzoneBuf[16];
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SyncTime_CURL_Init(curl, conf->http_proxy, conf->proxy_user);
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/* Calculating time diff between GMT and localtime */
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tt = time(0);
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lt = localtime(&tt);
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tt_local = mktime(lt);
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gmt = gmtime(&tt);
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tt_gmt = mktime(gmt);
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tzonediffFloat = difftime(tt_local, tt_gmt);
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tzonediffWord = (int)(tzonediffFloat/3600.0);
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if((double)(tzonediffWord * 3600) == tzonediffFloat)
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snprintf(tzoneBuf, 15, "%+03d'00'", tzonediffWord);
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else
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snprintf(tzoneBuf, 15, "%+03d'30'", tzonediffWord);
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/* Get current system time and local time */
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GetSystemTime(&SYSTime);
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GetLocalTime(&LOCALTime);
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snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ",
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DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay,
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MthStr[LOCALTime.wMonth-1], LOCALTime.wYear,
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LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond,
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LOCALTime.wMilliseconds);
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fprintf(stderr, "Fetch: %s\n\n", conf->timeserver);
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fprintf(stderr, "Before HTTP. Date: %s%s\n\n", timeBuf, tzoneBuf);
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/* HTTP HEAD command to the Webserver */
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SyncTime_CURL_Fetch(curl, conf->timeserver, "index.htm",
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HTTP_COMMAND_HEAD);
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GetLocalTime(&LOCALTime);
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snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ",
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DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay,
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MthStr[LOCALTime.wMonth-1], LOCALTime.wYear,
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LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond,
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LOCALTime.wMilliseconds);
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fprintf(stderr, "\nAfter HTTP. Date: %s%s\n", timeBuf, tzoneBuf);
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if(AutoSyncTime == 3) {
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/* Synchronising computer clock */
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if(!SetSystemTime(&SYSTime)) { /* Set system time */
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fprintf(stderr, "ERROR: Unable to set system time.\n");
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RetValue = 1;
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}
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else {
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/* Successfully re-adjusted computer clock */
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GetLocalTime(&LOCALTime);
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snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ",
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DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay,
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MthStr[LOCALTime.wMonth-1], LOCALTime.wYear,
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LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond,
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LOCALTime.wMilliseconds);
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fprintf(stderr, "\nNew System's Date: %s%s\n", timeBuf, tzoneBuf);
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}
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}
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/* Cleanup before exit */
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conf_init(conf);
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curl_easy_cleanup(curl);
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}
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return RetValue;
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}
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