#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
char* createLine(int size) {
	unsigned char* line=malloc(sizeof(char)*size);

	return line;
}
char* createPackage() {
	unsigned char** package=malloc(sizeof(char*)*(12));

	// Header line
	unsigned char* header = createLine(4);
	header[0]=35;//VN=4, Mode=3
	package[0]= header;

	unsigned char*tmp=0;
	//Temporary set to null
//	package[1]= createLine(4);
//	package[2]= createLine(4);
//	package[3]= createLine(4);
//
//
//	package[4]= createLine(8);
//	package[5]= createLine(8);
//	package[6]= createLine(8);
//	package[7]= createLine(8);

	package[1]= tmp;
		package[2]= tmp;
		package[3]= tmp;


		package[4]= tmp;
		package[5]= tmp;
		package[6]= tmp;
		package[7]= tmp;

	return package;
}


int main(int argc,char** argv)
{
	// Build the package
	char* myPackage = createPackage();


    char* port = "123";//argv[2];
    char* address ="0.de.pool.ntp.org";// argv[1];
	//initialize attributes of getaddrinfo function in order to get the ip adress of server
    struct addrinfo hints, *servinfo, *p;
    int client_socket;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_DGRAM;
    int rv;
    if ((rv = getaddrinfo(address, port, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        exit(1);
    }
	//creates a socket and connects it to a server
		struct timespec start, end;
		clock_gettime(CLOCK_MONOTONIC,&start);
      for(p = servinfo;p!=NULL;p=p->ai_next)
      {
        if((client_socket = socket(p->ai_family,p->ai_socktype,p->ai_protocol))   == -1)
        {
          perror("socket");
          continue;
        }
        // Connected succesfully!


        break;
      }
      if(p == NULL)
      {
        fprintf(stderr, "Not connected succesfully");
      }
	char buffer[1024];
	//while(1){

		socklen_t addrsize = sizeof servinfo;

		sendto(client_socket,myPackage,10,0,p->ai_addr,p->ai_addrlen);

		recvfrom(client_socket,buffer,1024,0,NULL,NULL);
		printf("\n %s",buffer);
		clock_gettime(CLOCK_MONOTONIC,&end);
		float diff = end.tv_nsec - start.tv_nsec;
		printf("\n%f\n",diff/1000000);


	//}

}