/* COMP2303 Week 10
**
** Address Handling Example Code
**	Code will be commented in class
*/

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

int main(int argc, char* argv[]) 
{
    struct in_addr a;
    in_addr_t ipAddr;
    unsigned int i, hostRepresentation;

    if(argc != 2) {
	fprintf(stderr, "Usage: %s ip-address\n", argv[0]);
	exit(1);
    }

    /* Convert dotted decimal string to network byte order representation */
    ipAddr = inet_addr(argv[1]);
    if(ipAddr == -1) {
	fprintf(stderr, "Invalid IP address: %s\n", argv[1]);
	exit(1);
    }

    /* Convert to host representation */
    hostRepresentation = ntohl(ipAddr);

    /* Print out both representations as 8 digit hex numbers */
    printf("%s: %08x (host order) %08x (network order)\n", 
	    argv[1], hostRepresentation, ipAddr);

    /* UL - unsigned long */
    i = (216UL<<24) + (109UL<<16) + (125UL<<8) + 70;
    /* convert to network byte order */
    a.s_addr = htonl(i);
    /* print out all representations */
    printf("%08x (host order) %08x (network order) %s (string)\n", 
	    i, a.s_addr, inet_ntoa(a));
    return 0;
}