#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <stdint.h>

#include <netinet/in.h>

#include "header.h"
#include "constants.h"

static uint16_t next_packet_id = 0;

static uint16_t dns_header_get_next_packet_id (void) {
	if (next_packet_id == 0) {
		next_packet_id = 1 + ((int) (65534.0 * rand () / (RAND_MAX + 1.0)));
	}
	
	return next_packet_id++;;
}

void dns_header_init (DNSHeader *header) {
	header->id = dns_header_get_next_packet_id ();
	//header->id = 0x72de;
	header->qr = QR_QUERY;
	header->opcode = OPCODE_QUERY;
	header->aa = 0;
	header->tc = 0;
	header->rd = 1;
	header->ra = 0;
	header->z = 0;
	header->ad = 0;
	header->cd = 0;
	header->rcode = RCODE_NOERROR;
	header->qdcount = 1;
	header->ancount = 0;
	header->nscount = 0;
	header->arcount = 0;
}