wake on wan

#include <WinSock2.h>
#include <WS2tcpip.h>
#pragma comment(lib, "ws2_32.lib")

#include <stdio.h>

const char* info = "wow.exe ipaddress/hostname port macaddress(xx-xx-xx-xx-xx-xx)\n";





int wmain(int argc,wchar_t** argv)
{
	
	if(argc<4)
	{
		printf(info);
		return -1;
	}


	WORD wVersionRequested = MAKEWORD(2,2);
	WSADATA wsaData;

	int err;
	err = WSAStartup(wVersionRequested,&wsaData);

	ADDRINFOW*	addr;

	err = GetAddrInfo(argv[1],NULL,NULL,&addr);
	if(addr==NULL)
	{
		printf("get address %S error %d",argv[1],err);
		return -1;
	}
	SOCKET s = socket(addr->ai_family,SOCK_DGRAM,IPPROTO_UDP);//SOCK_STREAM,IPPROTO_TCP);
	
	* (unsigned short*)addr->ai_addr->sa_data = htons(_wtoi(argv[2]));

	err = connect(s, addr->ai_addr, addr->ai_addrlen);

	char buf[16*6+6];
	memset(buf,-1,6);
	
	char mac[6] = {0};
	wchar_t* m = argv[3];

	for(int i=0; i<12; i++ , m++)
	{
		if(*m==L'-')m++;

		int tmp = *m;
		tmp &= 0x4f;
		int high,low;
		high = (tmp) >> 4;
		low = (tmp) & 0x0f;

		tmp = ((high * 10) >> 2) + low;
		tmp -= low==tmp?0:1;
		////if tmp > 0x0f  error
		mac[i/2] |= ((tmp & 0xf) << (((i+1)%2)*4));

	}

	for(int i=1; i<17; i++)
		memcpy(buf+i*6,mac,6);
	
	err = send(s,buf,6*16+6,NULL);

	shutdown(s,SD_BOTH);
	closesocket(s);
	FreeAddrInfo(addr);
	WSACleanup();
	return 0;
}