opening raw udp socket in promiscuous mode c -


i trying open raw socket deal udp traffic. need promiscuous. have looked @ lots of resources totally confused. here code:

char interface_name[12]; strcpy(interface_name, "eth1"); sd = socket(af_inet, sock_raw, ipproto_udp); if ( sd == -1 ) {     perror("error in opening socket.");     return; }  if ( setsockopt(sd, sol_socket, so_bindtodevice, interface_name, strlen(interface_name)) == -1 ) {     perror("error in binding sd.");     return; } int 1 = 1; if ( setsockopt (sd, ipproto_ip, ip_hdrincl, &one, sizeof(one)) < 0) {     perror("error in setting hdrincl.");     return; } struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, interface_name); if (ioctl(sd, siocgifindex, &ifr) < 0) {     perror("ioctl(siocgifindex) failed");     return; } int interface_index = ifr.ifr_ifindex; ifr.ifr_flags |= iff_promisc; if( ioctl(sd, siocsifflags, &ifr) != 0 ) {     perror("ioctl iff_promisc failed.");     return; } struct packet_mreq mr; memset(&mr, 0, sizeof(mr)); mr.mr_ifindex = interface_index; mr.mr_type = packet_mr_promisc;  if (setsockopt(sd, sol_packet, packet_add_membership, &mr, sizeof(mr)) < 0) {     perror("setsockopt(packet_mr_promisc) failed");     return 1; }

the final setsockopt fails error message "protocol not available". reason? suggestion?

it's because use sol_packet used packet(7) sockets. raw inet sockets, don't need option.


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