Формарование DNS запроса

[Iskander_ZI31]

Пишу DNS клиент, проблема в следущем, сервер отвечает непонятно что: пакет с моим id и еще что-то, длинной всего 12 бит! Подскажите пожалуйста может я пакет криво формирую!

#include "stdafx.h"
#include <WinSock2.h>
#include <Ws2tcpip.h>
#include <iostream>

struct DNS_HEADER
{
unsigned short id; // identification number
 
unsigned char rd :1; // recursion desired
unsigned char tc :1; // truncated message
unsigned char aa :1; // authoritive answer
unsigned char opcode :4; // purpose of message
unsigned char qr :1; // query/response flag
 
unsigned char rcode :4; // response code
unsigned char cd :1; // checking disabled
unsigned char ad :1; // authenticated data
unsigned char z :1; // its z! reserved
unsigned char ra :1; // recursion available
 
unsigned short q_count; // number of question entries
unsigned short ans_count; // number of answer entries
unsigned short auth_count; // number of authority entries
unsigned short add_count; // number of resource entries
};

void ChangetoDnsNameFormat (unsigned char*,unsigned char*);

struct QUESTION
{
unsigned short qtype;
unsigned short qclass;
};

int _tmain(int argc, _TCHAR* argv[])
{
	WSAData wd;
	SOCKET soc;
	struct sockaddr_in dns_addr;
	int iResult;

	unsigned char buf[65536],*qname,*reader;
	struct DNS_HEADER *dns = NULL;
	struct QUESTION *qinfo = NULL;
	unsigned char host[100];

	printf("nEnter Hostname to Lookup : ");
gets((char*)host);

	dns = (struct DNS_HEADER *)&buf;
	
 
dns->id = (32767);
dns->qr = 0; //This is a query
dns->opcode = 0; //This is a standard query
dns->aa = 0; //Not Authoritative
dns->tc = 0; //This message is not truncated
dns->rd = 1; //Recursion Desired
dns->ra = 0; //Recursion not available! hey we dont have it (lol)
dns->z = 0;
dns->ad = 0;
dns->cd = 0;
dns->rcode = 0;
dns->q_count = htons(1); //we have only 1 question
dns->ans_count = 0;
dns->auth_count = 0;
dns->add_count = 0;


//point to the query portion
qname =(unsigned char*)&buf[sizeof(struct DNS_HEADER)];
 ChangetoDnsNameFormat(qname,host);


qinfo =(struct QUESTION*)&buf[sizeof(struct DNS_HEADER) + (strlen((const char*)host) + 1)]; //fill it
 
qinfo->qtype = htons(1); //we are requesting the ipv4 address
qinfo->qclass = htons(1); //its internet (lol)
 

	WSAStartup (0x202, &wd);
	soc = socket(AF_INET,SOCK_DGRAM,0);// socket(AF_INET,SOCK_STREAM,0);

	dns_addr.sin_family=AF_INET;
	dns_addr.sin_port=htons(53);
	dns_addr.sin_addr.s_addr=inet_addr("81.30.199.94");

/*
	iResult = connect(soc,(sockaddr*) &dns_addr,sizeof(dns_addr));
    if ( iResult == SOCKET_ERROR) {
        closesocket (soc);
        printf("Unable to connect to server: %ld\n", WSAGetLastError());
       	WSACleanup();
		Sleep(5000);
        return 1;
    }
	*/

	

	

	//char *sendbuff;
//sendbuff="11001100110011000010000003www2ya2ru00101";
	char recvbuff[512];
	//int nsize;
   
    
//	if(sendto(s,(char*)buf,sizeof(struct DNS_HEADER) + (strlen((const char*)qname)+1) + sizeof(struct QUESTION),0,(struct sockaddr*)&dest,sizeof(dest))==SOCKET_ERROR)
//{
//printf("%d error",WSAGetLastError()); 
//}  sendto(soc,(char*)buf,sizeof(struct DNS_HEADER) + (strlen((const char*)qname)+1) + sizeof(struct QUESTION), 0 , (sockaddr*) &dns_addr,sizeof(dns_addr));
	printf("%s",buf);
	int size_buf= sizeof(struct DNS_HEADER) + (strlen((const char*)host)+1) + sizeof(struct QUESTION);
	iResult = sendto(soc,(char*)buf,size_buf,0,(struct sockaddr*)&dns_addr,sizeof(dns_addr));
    if (iResult == SOCKET_ERROR) {
        printf("send failed: %d\n", WSAGetLastError());
        closesocket(soc);
        WSACleanup();
		Sleep(5000);
        return 1;
    }

/*
	///разбираем ответ

	printf("Received.");
	
	dns=(struct DNS_HEADER*)buf;
	
reader=&buf[sizeof(struct DNS_HEADER) + (strlen((const char*)qname)+1) + sizeof(struct QUESTION)];
 
printf("nThe response contains : ");
printf("n %d Questions.",ntohs(dns->q_count));
printf("n %d Answers.",ntohs(dns->ans_count));
printf("n %d Authoritative Servers.",ntohs(dns->auth_count));
printf("n %d Additional records.nn",ntohs(dns->add_count));
 
//reading answers
//stop=0;
*/
  

	sockaddr_in server_addr; 
	int server_addr_size=sizeof(server_addr);
iResult = recvfrom(soc, &recvbuff[0], 512, 0, (sockaddr*)&server_addr,&server_addr_size);


closesocket(soc);
        WSACleanup();
        return 2;
		Sleep(5000);


}

void ChangetoDnsNameFormat(unsigned char* dns,unsigned char* host)
{
int lock=0 , i;
 
strcat((char*)host,".");
 
for(i=0;i<(int)strlen((char*)host);i++)
{
if(host[i]=='.')
{
*dns++=i-lock;
for(;lock<i;lock++)
{
*dns++=host[lock];
}
lock++; 
}
}
*dns++='0';
}