host_v4(const char *s)
host_v4(const char *s, int mask)
host_v4(const char *s){	struct node_host	*h = NULL;	struct in_addr		 ina;	int			 bits;	memset(&ina, 0, sizeof(struct in_addr));	if ((bits = inet_net_pton(AF_INET, s, &ina, sizeof(ina))) > -1) {		h = calloc(1, sizeof(struct node_host));		if (h == NULL)			err(1, "address: calloc");		h->ifname = NULL;		h->af = AF_INET;		h->addr.v.a.addr.addr32[0] = ina.s_addr;		set_ipmask(h, bits);		h->next = NULL;		h->tail = h;	}	return (h);}