IP & Etherdevice ermitteln

[ändy]

Hi !

Mit welchen C-Funktion kann ich:
1. die MAC Adresse ermitteln ?
2. die IP Adresse die diese Ethernet Gerät zugewiesen bekam ?

Also so zB:

struct ether_addr* gib_mir_mac_von( char* dev_name ); //zB dev_name = "eth1"
struct in_addr* gib_mir_ip_von( char* dev_name );

oder sowas in der Art.

[rüdiger]

man: ioctl(2)

[ändy]

Yeah, cool funktioniert wunderbar.

Hardwareadresse ermitteln:

int sock_fd = socket( AF_INET , SOCK_DGRAM , 0 );
    if( sock_fd == -1 ) { printf("Error: creating socket.\n"); exit(1); }
    struct ifreq ifr;
    strcpy( ifr.ifr_name , "eth1" );
    if( ioctl( sock_fd , SIOCGIFHWADDR , &ifr ) == -1 ) { printf("problems with ioctl.\n"); exit(1); }
    printf("%s\n" , ether_ntoa( (struct ether_addr*) ifr.ifr_hwaddr.sa_data ) );
    close( sock_fd );

IP Adresse ermitteln:

int sock_fd = socket( AF_INET , SOCK_DGRAM , 0 );
    if( sock_fd == -1 ) { printf("Error: creating socket.\n"); exit(1); }
    struct ifreq ifr;
    strcpy( ifr.ifr_name , interface );
    if( ioctl( sock_fd , SIOCGIFADDR , &ifr ) == -1 ) { printf("problems with ioctl.\n"); exit(1); }
    ip->saddr = inet_addr( inet_ntoa( ((struct sockaddr_in *) (&ifr.ifr_addr))->sin_addr ) );
    close( sock_fd );