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10-at-a-time.c
(4.24 KB)
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Makefile.example
(1.86 KB)
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README.md
(1.35 KB)
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altsvc.c
(1.83 KB)
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anyauthput.c
(4.82 KB)
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cacertinmem.c
(7.14 KB)
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certinfo.c
(2.25 KB)
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chkspeed.c
(6.54 KB)
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cookie_interface.c
(4.03 KB)
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crawler.c
(6.53 KB)
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curlgtk.c
(2.94 KB)
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curlx.c
(16.41 KB)
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debug.c
(4.21 KB)
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ephiperfifo.c
(14.49 KB)
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evhiperfifo.c
(11.9 KB)
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externalsocket.c
(4.83 KB)
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fileupload.c
(2.78 KB)
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fopen.c
(13.87 KB)
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ftp-wildcard.c
(4.15 KB)
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ftpget.c
(2.59 KB)
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ftpgetinfo.c
(2.86 KB)
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ftpgetresp.c
(2.51 KB)
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ftpsget.c
(2.89 KB)
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ftpupload.c
(4.48 KB)
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ftpuploadfrommem.c
(3.81 KB)
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ftpuploadresume.c
(4.24 KB)
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getinfo.c
(1.62 KB)
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getinmemory.c
(3.24 KB)
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getredirect.c
(2.3 KB)
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getreferrer.c
(1.81 KB)
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ghiper.c
(12.04 KB)
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hiperfifo.c
(11.97 KB)
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href_extractor.c
(2.61 KB)
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htmltidy.c
(3.88 KB)
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htmltitle.cpp
(6.23 KB)
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http-post.c
(1.99 KB)
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http2-download.c
(6.19 KB)
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http2-pushinmemory.c
(5.02 KB)
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http2-serverpush.c
(7.1 KB)
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http2-upload.c
(8.05 KB)
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http3-present.c
(1.53 KB)
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http3.c
(1.81 KB)
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httpcustomheader.c
(2.27 KB)
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httpput-postfields.c
(3.36 KB)
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httpput.c
(3.6 KB)
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https.c
(2.53 KB)
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imap-append.c
(3.77 KB)
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imap-authzid.c
(2.21 KB)
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imap-copy.c
(2.35 KB)
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imap-create.c
(2.06 KB)
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imap-delete.c
(2.06 KB)
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imap-examine.c
(2.11 KB)
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imap-fetch.c
(1.95 KB)
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imap-list.c
(2.08 KB)
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imap-lsub.c
(2.08 KB)
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imap-multi.c
(2.29 KB)
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imap-noop.c
(2 KB)
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imap-search.c
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imap-ssl.c
(3.25 KB)
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imap-store.c
(2.69 KB)
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imap-tls.c
(3.5 KB)
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makefile.dj
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multi-app.c
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multi-debugcallback.c
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multi-double.c
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multi-event.c
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multi-formadd.c
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multi-legacy.c
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multi-post.c
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multi-single.c
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multi-uv.c
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multithread.c
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opensslthreadlock.c
(2.69 KB)
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parseurl.c
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persistent.c
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pop3-authzid.c
(2.18 KB)
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pop3-dele.c
(2.15 KB)
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pop3-list.c
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pop3-multi.c
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pop3-noop.c
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pop3-retr.c
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pop3-ssl.c
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pop3-stat.c
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pop3-tls.c
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pop3-top.c
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pop3-uidl.c
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post-callback.c
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postinmemory.c
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postit2-formadd.c
(3.51 KB)
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postit2.c
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progressfunc.c
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resolve.c
(1.92 KB)
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rtsp.c
(9.02 KB)
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sampleconv.c
(3.25 KB)
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sendrecv.c
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sepheaders.c
(2.67 KB)
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sessioninfo.c
(3.06 KB)
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sftpget.c
(3.25 KB)
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sftpuploadresume.c
(3.82 KB)
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shared-connection-cache.c
(2.51 KB)
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simple.c
(1.68 KB)
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simplepost.c
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simplessl.c
(4.56 KB)
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smooth-gtk-thread.c
(6.01 KB)
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smtp-authzid.c
(5.33 KB)
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smtp-expn.c
(2.55 KB)
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smtp-mail.c
(4.86 KB)
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smtp-mime.c
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smtp-multi.c
(4.54 KB)
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smtp-ssl.c
(5.75 KB)
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smtp-tls.c
(6.21 KB)
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smtp-vrfy.c
(2.62 KB)
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sslbackend.c
(2.29 KB)
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synctime.c
(12.6 KB)
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threaded-ssl.c
(4.34 KB)
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url2file.c
(2.43 KB)
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urlapi.c
(1.98 KB)
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usercertinmem.c
(8.87 KB)
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xmlstream.c
(4.94 KB)
Editing: synctime.c
/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2021, 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.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. * ***************************************************************************/ /* <DESC> * Set your system time from a remote HTTP server's Date: header. * </DESC> */ /* This example code only builds as-is on Windows. * * While Unix/Linux user, you do not need this software. * You can achieve the same result as synctime using curl, awk and date. * Set proxy as according to your network, but beware of proxy Cache-Control. * * To set your system clock, root access is required. * # date -s "`curl -sI https://nist.time.gov/timezone.cgi?UTC/s/0 \ * | awk -F': ' '/Date: / {print $2}'`" * * To view remote webserver date and time. * $ curl -sI https://nist.time.gov/timezone.cgi?UTC/s/0 \ * | awk -F': ' '/Date: / {print $2}' * * Synchronising your computer clock via Internet time server usually relies * on DAYTIME, TIME, or NTP protocols. These protocols provide good accurate * time synchronisation but it does not work very well through a * firewall/proxy. Some adjustment has to be made to the firewall/proxy for * these protocols to work properly. * * There is an indirect method. Since most webserver provide server time in * their HTTP header, therefore you could synchronise your computer clock * using HTTP protocol which has no problem with firewall/proxy. * * For this software to work, you should take note of these items. * 1. Your firewall/proxy must allow your computer to surf internet. * 2. Webserver system time must in sync with the NTP time server, * or at least provide an accurate time keeping. * 3. Webserver HTTP header does not provide the milliseconds units, * so there is no way to get very accurate time. * 4. This software could only provide an accuracy of +- a few seconds, * as Round-Trip delay time is not taken into consideration. * Compensation of network, firewall/proxy delay cannot be simply divide * the Round-Trip delay time by half. * 5. Win32 SetSystemTime() API will set your computer clock according to * GMT/UTC time. Therefore your computer timezone must be properly set. * 6. Webserver data should not be cached by the proxy server. Some * webserver provide Cache-Control to prevent caching. * * References: * https://web.archive.org/web/20100228012139/ \ * tf.nist.gov/timefreq/service/its.htm * https://web.archive.org/web/20100409024302/ \ * tf.nist.gov/timefreq/service/firewall.htm * * Usage: * This software will synchronise your computer clock only when you issue * it with --synctime. By default, it only display the webserver's clock. * * Written by: Frank (contributed to libcurl) * * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. * * IN NO EVENT SHALL THE AUTHOR OF THIS SOFTWARE BE LIABLE FOR * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. * */ #include <stdio.h> #include <time.h> #ifndef __CYGWIN__ #include <winsock2.h> #include <windows.h> #endif #include <curl/curl.h> #define MAX_STRING 256 #define MAX_STRING1 MAX_STRING + 1 #define SYNCTIME_UA "synctime/1.0" typedef struct { char http_proxy[MAX_STRING1]; char proxy_user[MAX_STRING1]; char timeserver[MAX_STRING1]; } conf_t; const char DefaultTimeServer[3][MAX_STRING1] = { "https://nist.time.gov/", "https://www.google.com/" }; const char *DayStr[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; const char *MthStr[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; int ShowAllHeader; int AutoSyncTime; SYSTEMTIME SYSTime; SYSTEMTIME LOCALTime; #define HTTP_COMMAND_HEAD 0 #define HTTP_COMMAND_GET 1 size_t SyncTime_CURL_WriteOutput(void *ptr, size_t size, size_t nmemb, void *stream) { fwrite(ptr, size, nmemb, stream); return (nmemb*size); } size_t SyncTime_CURL_WriteHeader(void *ptr, size_t size, size_t nmemb, void *stream) { char TmpStr1[26], TmpStr2[26]; (void)stream; if(ShowAllHeader == 1) fprintf(stderr, "%s", (char *)(ptr)); if(strncmp((char *)(ptr), "Date:", 5) == 0) { if(ShowAllHeader == 0) fprintf(stderr, "HTTP Server. %s", (char *)(ptr)); if(AutoSyncTime == 1) { *TmpStr1 = 0; *TmpStr2 = 0; if(strlen((char *)(ptr)) > 50) /* Can prevent buffer overflow to TmpStr1 & 2? */ AutoSyncTime = 0; else { int RetVal = sscanf((char *)(ptr), "Date: %25s %hu %s %hu %hu:%hu:%hu", TmpStr1, &SYSTime.wDay, TmpStr2, &SYSTime.wYear, &SYSTime.wHour, &SYSTime.wMinute, &SYSTime.wSecond); if(RetVal == 7) { int i; SYSTime.wMilliseconds = 500; /* adjust to midpoint, 0.5 sec */ for(i = 0; i<12; i++) { if(strcmp(MthStr[i], TmpStr2) == 0) { SYSTime.wMonth = i + 1; break; } } AutoSyncTime = 3; /* Computer clock will be adjusted */ } else { AutoSyncTime = 0; /* Error in sscanf() fields conversion */ } } } } if(strncmp((char *)(ptr), "X-Cache: HIT", 12) == 0) { fprintf(stderr, "ERROR: HTTP Server data is cached." " Server Date is no longer valid.\n"); AutoSyncTime = 0; } return (nmemb*size); } void SyncTime_CURL_Init(CURL *curl, char *proxy_port, char *proxy_user_password) { if(strlen(proxy_port) > 0) curl_easy_setopt(curl, CURLOPT_PROXY, proxy_port); if(strlen(proxy_user_password) > 0) curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, proxy_user_password); #ifdef SYNCTIME_UA curl_easy_setopt(curl, CURLOPT_USERAGENT, SYNCTIME_UA); #endif curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, SyncTime_CURL_WriteOutput); curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, SyncTime_CURL_WriteHeader); } int SyncTime_CURL_Fetch(CURL *curl, char *URL_Str, char *OutFileName, int HttpGetBody) { FILE *outfile; CURLcode res; outfile = NULL; if(HttpGetBody == HTTP_COMMAND_HEAD) curl_easy_setopt(curl, CURLOPT_NOBODY, 1L); else { outfile = fopen(OutFileName, "wb"); curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile); } curl_easy_setopt(curl, CURLOPT_URL, URL_Str); res = curl_easy_perform(curl); if(outfile != NULL) fclose(outfile); return res; /* (CURLE_OK) */ } void showUsage(void) { fprintf(stderr, "SYNCTIME: Synchronising computer clock with time server" " using HTTP protocol.\n"); fprintf(stderr, "Usage : SYNCTIME [Option]\n"); fprintf(stderr, "Options :\n"); fprintf(stderr, " --server=WEBSERVER Use this time server instead" " of default.\n"); fprintf(stderr, " --showall Show all HTTP header.\n"); fprintf(stderr, " --synctime Synchronising computer clock" " with time server.\n"); fprintf(stderr, " --proxy-user=USER[:PASS] Set proxy username and" " password.\n"); fprintf(stderr, " --proxy=HOST[:PORT] Use HTTP proxy on given" " port.\n"); fprintf(stderr, " --help Print this help.\n"); fprintf(stderr, "\n"); return; } int conf_init(conf_t *conf) { int i; *conf->http_proxy = 0; for(i = 0; i<MAX_STRING1; i++) conf->proxy_user[i] = 0; /* Clean up password from memory */ *conf->timeserver = 0; return 1; } int main(int argc, char *argv[]) { CURL *curl; conf_t conf[1]; int RetValue; ShowAllHeader = 0; /* Do not show HTTP Header */ AutoSyncTime = 0; /* Do not synchronise computer clock */ RetValue = 0; /* Successful Exit */ conf_init(conf); if(argc > 1) { int OptionIndex = 0; while(OptionIndex < argc) { if(strncmp(argv[OptionIndex], "--server=", 9) == 0) snprintf(conf->timeserver, MAX_STRING, "%s", &argv[OptionIndex][9]); if(strcmp(argv[OptionIndex], "--showall") == 0) ShowAllHeader = 1; if(strcmp(argv[OptionIndex], "--synctime") == 0) AutoSyncTime = 1; if(strncmp(argv[OptionIndex], "--proxy-user=", 13) == 0) snprintf(conf->proxy_user, MAX_STRING, "%s", &argv[OptionIndex][13]); if(strncmp(argv[OptionIndex], "--proxy=", 8) == 0) snprintf(conf->http_proxy, MAX_STRING, "%s", &argv[OptionIndex][8]); if((strcmp(argv[OptionIndex], "--help") == 0) || (strcmp(argv[OptionIndex], "/?") == 0)) { showUsage(); return 0; } OptionIndex++; } } if(*conf->timeserver == 0) /* Use default server for time information */ snprintf(conf->timeserver, MAX_STRING, "%s", DefaultTimeServer[0]); /* Init CURL before usage */ curl_global_init(CURL_GLOBAL_ALL); curl = curl_easy_init(); if(curl) { struct tm *lt; struct tm *gmt; time_t tt; time_t tt_local; time_t tt_gmt; double tzonediffFloat; int tzonediffWord; char timeBuf[61]; char tzoneBuf[16]; SyncTime_CURL_Init(curl, conf->http_proxy, conf->proxy_user); /* Calculating time diff between GMT and localtime */ tt = time(0); lt = localtime(&tt); tt_local = mktime(lt); gmt = gmtime(&tt); tt_gmt = mktime(gmt); tzonediffFloat = difftime(tt_local, tt_gmt); tzonediffWord = (int)(tzonediffFloat/3600.0); if((double)(tzonediffWord * 3600) == tzonediffFloat) snprintf(tzoneBuf, 15, "%+03d'00'", tzonediffWord); else snprintf(tzoneBuf, 15, "%+03d'30'", tzonediffWord); /* Get current system time and local time */ GetSystemTime(&SYSTime); GetLocalTime(&LOCALTime); snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ", DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay, MthStr[LOCALTime.wMonth-1], LOCALTime.wYear, LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond, LOCALTime.wMilliseconds); fprintf(stderr, "Fetch: %s\n\n", conf->timeserver); fprintf(stderr, "Before HTTP. Date: %s%s\n\n", timeBuf, tzoneBuf); /* HTTP HEAD command to the Webserver */ SyncTime_CURL_Fetch(curl, conf->timeserver, "index.htm", HTTP_COMMAND_HEAD); GetLocalTime(&LOCALTime); snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ", DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay, MthStr[LOCALTime.wMonth-1], LOCALTime.wYear, LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond, LOCALTime.wMilliseconds); fprintf(stderr, "\nAfter HTTP. Date: %s%s\n", timeBuf, tzoneBuf); if(AutoSyncTime == 3) { /* Synchronising computer clock */ if(!SetSystemTime(&SYSTime)) { /* Set system time */ fprintf(stderr, "ERROR: Unable to set system time.\n"); RetValue = 1; } else { /* Successfully re-adjusted computer clock */ GetLocalTime(&LOCALTime); snprintf(timeBuf, 60, "%s, %02d %s %04d %02d:%02d:%02d.%03d, ", DayStr[LOCALTime.wDayOfWeek], LOCALTime.wDay, MthStr[LOCALTime.wMonth-1], LOCALTime.wYear, LOCALTime.wHour, LOCALTime.wMinute, LOCALTime.wSecond, LOCALTime.wMilliseconds); fprintf(stderr, "\nNew System's Date: %s%s\n", timeBuf, tzoneBuf); } } /* Cleanup before exit */ conf_init(conf); curl_easy_cleanup(curl); } return RetValue; }
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