resolve_ip.c

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

int main(int argc, char **argv)
{
    if (argc < 2) {
        printf("Provide the host to be resolved\n");
        return 1;
    }
    char *host = argv[1];
    struct hostent *hp = gethostbyname(host);
    if (hp == NULL)
    {
        fprintf(stderr, "Error resolving %s\n", host);
        return 1;
    }
    printf("Host %s resolved to:\n", host);
    for (size_t i = 0; i < hp->h_length; i++)
    {
        struct in_addr *addr = (struct in_addr *)hp->h_addr_list[i];
        if (addr == NULL)
            break;
        printf("\t%s\n", inet_ntoa(*addr));
    }
    return 0;
}