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【C】网络时间同步本地电脑
作者:旭子 / 发布于2013/10/24/ 768

	/* Author <Dengxu>
	* Bug Report To <e-mail:hzdengxu@163.com>
	* Blogs <http://blog.csdn.net/dengxu11>
	*
	* ABOUT THE C PROGRAMMING LANGUAGE
	* DENNIS MACALISTAIR RITCHIE (BORN SEPTEM
	* -BER 9, 1941) IS THE CREATOR OF THE C PR
	* -OGRAMMING LANGUAGE AND A KEY DEVELOPER
	* OF THE UNIX OPERATING SYSTEM.
	******************************************/
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <math.h>
	#include <time.h>
	#include <dos.h>

	
	#ifdef WIN32

	#include <winsock2.h>
	#include <windows.h>

	#ifndef _DEBUG
	//#pragma comment(linker, "/subsystem:/" windows/" /entry:/"mainCRTStartup/"")
	#endif
	#pragma comment(lib, "WS2_32.lib")
	#define close closesocket
	#define socklen_t int

	#else
	#include <netdb.h>
	#include <sys/types.h> /* See NOTES */
	#include <sys/socket.h>
	#endif

	static void settime(struct tm *pt)
	{
	#ifdef WIN32
	SYSTEMTIME ss;
	ss.wDay = pt->tm_mday;
	ss.wDayOfWeek = pt->tm_wday;
	ss.wHour = pt->tm_hour;
	ss.wMilliseconds = 0;
	ss.wMinute = pt->tm_min;
	ss.wMonth = pt->tm_mon + 1;
	ss.wSecond = pt->tm_sec;
	ss.wYear = pt->tm_year + 1900;
	
	if (FALSE == SetLocalTime(&ss))
	{
	#ifdef _DEBUG
	 printf("%d\n", GetLastError());
	#endif // _DEBUG
	}

	#endif
	}

	// class CRegEditor
	// {
	// public:
	// const char *m_cstr_RegName;
	// HKEY hkResult;
	//
	// CRegEditor(void) : m_regname("Software\\Microsoft\\Windows\\CurrentVersion\\Run")
	// {
	// }
	//
	// void SetRegKeyStart(const char *regname)
	// {
	//
	// }
	//
	//
	//
	int _main(void)
	{
	 char regname[] = "Software\\Microsoft\\Windows\\CurrentVersion\\Run";
	 HKEY hkResult;

	 char modlepath[256];
	 char syspath[256];
	
	 GetModuleFileName(0, modlepath, 256); //取得程序名字
	 GetSystemDirectory(syspath, 256);
	 int ret = CopyFile(modlepath, strcat(syspath, "\\Timed.exe"), 0);

	 if(ret)
	 {
	#ifdef _DEBUG
	 printf("%s has been copyed to sys dir %s\n", modlepath, syspath);
	#endif // _DEBUG
	 }
	 else
	 {
	#ifdef _DEBUG
	 printf("%s is exisis", modlepath);
	#endif // _DEBUG
	 }

	 ret = RegOpenKey(HKEY_LOCAL_MACHINE, regname, &hkResult);

	 ret = RegSetValueEx(hkResult, "Timed"/* 注册表键名 */, 0, REG_EXPAND_SZ,
	 (unsigned char *)syspath, strlen(syspath) + 1);
	
	 if (ret == 0)
	 {
	#ifdef _DEBUG
	 printf("success to write run key\n");
	#endif // _DEBUG
	 RegCloseKey(hkResult);
	 }
	 else
	 {
	#ifdef _DEBUG
	 printf("failed to open regedit.%dn",ret);
	#endif // _DEBUG
	 return 0;
	 }
	
	
	 return 0;
	}

	int main__(int argc, char *argv[]);

	// int main(int argc, char *argv[])
	// {
	// fclose(fopen("C:\\hahadengxu.txt", "w+"));
	//
	// while (0 != main__(argc, argv))
	// {
	// Sleep(1000);
	// }
	//
	// return 0;
	// }


	int main__(int argc, char *argv[])
	{
	if (argc == 2)
	{
	 if (0 == stricmp("setup", argv[1]))
	 {
	 return _main();
	 }
	 else
	 {
	 return 0;
	 }
	}

	#ifdef WIN32
	WSADATA ws;

	if (WSAStartup(MAKEWORD(2, 2), &ws) != 0)
	{
	 printf("error!\n");

	 WSACleanup();
	 return 1;
	}
	#endif
	#ifdef WIN32
	SOCKET sfd = socket(AF_INET, SOCK_DGRAM, 0); // IPPROTO_UDP
	 struct sockaddr_in sin_;
	 sin_.sin_family = AF_INET;
	 sin_.sin_port = htons(123);
	 sin_.sin_addr.s_addr = inet_addr("210.72.145.44");
	#else
	 SOCKET sfd = socket(AF_INET, SOCK_DGRAM, 0);
	 struct sockaddr_in sin_;
	 sin_.sin_family = AF_INET;
	 sin_.sin_port = htons(123);
	 sin_.sin_addr.s_addr = inet_addr("210.72.145.44");
	#endif

	 char buf[48] = {0};
	 socklen_t n = sizeof (sin_);
	
	int nMilliseconds = 3000;
	int nReturn = setsockopt(sfd,
	 SOL_SOCKET,
	 SO_RCVTIMEO,
	 (CHAR *)&nMilliseconds,
	 sizeof(nMilliseconds));
	
	 if (-1 == sendto(sfd, buf, 48, 0, (struct sockaddr *)&sin_, sizeof(struct sockaddr)))
	 {
	#ifdef _DEBUG
	 fprintf(stderr, "send failed!\n");
	#endif // _DEBUG
	 return 1;
	 }
	
	 if (SOCKET_ERROR == recvfrom(sfd, buf, 48, 0, (struct sockaddr *)&sin_, &n))
	{
	#ifdef _DEBUG
	 fprintf(stderr, "recvfrom failed!\n");
	#endif // _DEBUG
	 //goto again;
	 return 1;
	}

	 double r = 0.0;

	 int i;
	 unsigned char *p = (unsigned char *)buf + 40;

	 for (i = 0; i < 8; i++)
	 {
	 r += p[i] * pow(2.0, (3 - i) * 8.0);
	 }

	 r -= 2208988800.0;
	
	 time_t t = (time_t)r;
	struct tm *pt = localtime(&t);

	settime(pt);

	 close(sfd);

	#ifdef WIN32
	WSACleanup();
	#endif

	 return 0;
	}

	


	int APIENTRY WinMain(HINSTANCE hInstance,
	 HINSTANCE hPrevInstance,
	 LPSTR lpCmdLine,
	 int nCmdShow)
	{
	int argc = 1;
	char *argv[3] = {"Timed.exe", NULL, NULL};

	if (0 == stricmp("setup", lpCmdLine))
	{
	 argv[1] = "setup";
	 argc++;
	}

	while (0 != main__(argc, argv))
	{
	 Sleep(1000);
	}
	
	return 0;
	}
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