#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/ip.h>
#include<netdb.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>

int main(int args, char ** argv){
	struct sockaddr_in sad;
	sad.sin_port = htons(atoi(argv[2]));
	sad.sin_family = AF_INET;

	int skt = socket(AF_INET, SOCK_DGRAM, 0);

	struct hostent* entry = gethostbyname(argv[1]);
	struct in_addr **addr_list = (struct in_addr**)entry->h_addr_list;
	struct in_addr* c_addr = addr_list[0];
	char* ip_string = inet_ntoa(*c_addr);
	sad.sin_addr = *c_addr;
	printf("Sending request to:  %s\n", ip_string);


	long int a = 100, b = 20;
	char buffer[20];
	memcpy(buffer, "DIVI", 4);
	memcpy(buffer+4, &a, 8);
	memcpy(buffer+12, &b, 8);
	sendto(skt, buffer, 20, 0, (struct sockaddr*)&sad, sizeof(sad));
	
	printf("Expecting to receive next\n");
	recvfrom(skt, buffer, 12, 0, 0, 0);
	memcpy(&a, buffer+4, 8);
	printf("The answer was %ld\n", a);

	return 0;
}