#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <string>
#include <arpa/inet.h>
#include <iostream>

uint32_t convert_cidr_to_binary_netmask(unsigned int cidr) {
    uint32_t binary_netmask = 0xFFFFFFFF; 
    binary_netmask = binary_netmask << ( 32 - cidr );
    // htonl from host byte order to network
    // ntohl from network byte order to host

    // We need network byte order at output 
    return htonl(binary_netmask);
}

uint32_t convert_ip_as_string_to_uint(std::string ip) {
    struct in_addr ip_addr;
    inet_aton(ip.c_str(), &ip_addr);

    // in network byte order
    return ip_addr.s_addr;
}

int main() {
    uint32_t network_zero = convert_ip_as_string_to_uint("10.10.10.0");
    uint32_t network_200 = convert_ip_as_string_to_uint("10.10.10.200"); 
    uint32_t binary_netmask = convert_cidr_to_binary_netmask(24);

    uint32_t generated_subnet_address = network_200 & binary_netmask; 

    std::cout<<"network byte order"<<std::endl;
    std::cout<<"10.10.10.200/24\tnetwork byte order:"<<network_200 <<" host byte order:"<<ntohl(network_200)<<std::endl;
    std::cout<<"10.10.10.0/24\tnetwork byte order:"  <<network_zero<<" host byte order:"<<ntohl(network_zero)<<std::endl;
    
    std::cout<<"generated \tnetwork byte order:"  <<generated_subnet_address<<" host byte order:"<<ntohl(generated_subnet_address)<<std::endl; 
}