Set mac address via ioctl

[Sife Mailling]

After reading ifconfig source code for hours, I end with this, witch was suppose to change mac address via a command line:
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/mac.h> #include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h> /* IP */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h> #include <ifaddrs.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h> struct afswtch { const char	*af_name;	/* as given on cmd line, e.g. "inet" */ short		af_af;		/* AF_* */ /* * Status is handled one of two ways; if there is an * address associated with the interface then the * associated address family af_status method is invoked * with the appropriate addressin info.  Otherwise, if * all possible info is to be displayed and af_other_status * is defined then it is invoked after all address status * is presented. */ void		(*af_status)(int, const struct ifaddrs *); void		(*af_other_status)(int); /* parse address method */ void		(*af_getaddr)(const char *, int); /* parse prefix method (IPv6) */ void		(*af_getprefix)(const char *, int); void		(*af_postproc)(int s, const struct afswtch *); u_long		af_difaddr;	/* set dst if address ioctl */ u_long		af_aifaddr;	/* set if address ioctl */ void		*af_ridreq;	/* */ void		*af_addreq;	/* */ struct afswtch	*af_next; /* XXX doesn't fit model */ void	
	(*af_status_tunnel)(int); void		(*af_settunnel)(int s, struct addrinfo *srcres, struct addrinfo *dstres);
}; int
main(int argc, char **argv) 
{ int	s, error; struct	ifreq ifr; //char	name[IFNAMSIZ]; mac_t label; if (mac_from_text(&label, argv[1]) == -1) { perror(argv[1]); return; } ifr.ifr_addr.sa_family = AF_INET; if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0) err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family); memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, argv[2], sizeof(ifr.ifr_name)); ifr.ifr_ifru.ifru_data = (void *)label; error = ioctl(s, SIOCSIFMAC, &ifr); mac_free(label); if (error == -1) perror("setifmac"); return 0;
}
Now, if I try to change mac address of my card, I get this message:
./mactool dc0 00:10:22:33:44:77
mactool: socket(family 18,SOCK_DGRAM: Protocol not supported