Sniffer de dominios

#include<stdlib.h> #include<stdio.h> #include<errno.h> #include<netinet/in.h> #include<netdb.h> #include<sys/types.h> #include<sys/socket.h> #include<arpa/inet.h> int main(int argc, char const *argv[]){ struct hostent *h; if(argc != 2){ fprintf(stderr, "USa: %s<nombre_dominio>\n", argv[0]); exit(1); } if((h = gethostbyname(argv[1]))==NULL){ herror("gethostbyname"); exit(1); } else printf("gethostbyname() is OK.\n"); printf("El nombre del host es: %s\n", h->h_name); printf("La dirección IP es: es: %s\n", inet_ntoa(*((struct in_addr*)h->h_addr))); printf("Sniffeando otros nombres... sniff... sniff... snif...\n"); int j = 0; do { printf("Alias #%d es: %s\n",j,h->h_aliases[j]); j++; } while (h->h_aliases[j]!=NULL); printf("Sniffeando oras IPs...sniff...sniff...sniff\n"); int i = 0; do { printf("Direccion #%i es: %s\n",i, inet_ntoa(*((struct in_addr*)(h->h_addr_list[i])))); i++; } while (h->h_addr_list[i]!=NULL); return 0; }