/*
 * By: John Stile <john@stilen.com>
 * Purpose: Determine broadcast address from the ip and subnet mask
 */

#include <stdio.h>
#include <arpa/inet.h>
#include <stdio.h>

int main()
{

    /*
     * I get the addresses as strings from config file
     */
    char * ip = "192.168.60.116";
    char * mask = "255.255.255.0";
    
    /*
     * Convert to sockaddr_in structs
     */
    struct sockaddr_in addr_ip;
    struct sockaddr_in addr_netmask;
    struct sockaddr_in addr_broadcast;

    if ( 1 != (inet_pton( AF_INET, ip, &addr_ip.sin_addr)) ) return 1;
    if ( 1 != (inet_pton( AF_INET, mask, &addr_netmask.sin_addr)) ) return 1;
    /*
     * initially set broadcast to subnet mask
     */
    if ( 1 != (inet_pton( AF_INET, mask, &addr_broadcast.sin_addr)) ) return 1;
    
    printf("0x%08x\n", addr_broadcast.sin_addr);
    /*
     *  xor to flip bits
     */
    addr_broadcast.sin_addr.s_addr ^= 0xffffffff;
    printf("0x%08x\n", addr_broadcast.sin_addr);
    /*
     * Finall merge that wiht the IP
     */
    addr_broadcast.sin_addr.s_addr |= addr_ip.sin_addr.s_addr;
    printf("0x%08x\n", addr_broadcast.sin_addr);
    
    printf("0x%08x\n", addr_ip.sin_addr);
    printf("0x%08x\n", addr_netmask.sin_addr);
    printf("0x%08x\n", addr_broadcast.sin_addr);
    printf("IP:%s\n", inet_ntoa(addr_ip.sin_addr));
    printf("MASK:%s\n", inet_ntoa(addr_netmask.sin_addr));
    printf("BROADCAST:%s\n", inet_ntoa(addr_broadcast.sin_addr));
    
    return 0;
}