Hi Eward,

On 7/3/19 8:38, Edward Bartolo <edbarx@???> via Dng wrote:
> Hi Everyone,
>
> My version of simple-netaid-backend has been debugged to connect when
> there is only one active wifi hotspot. It was previously failing to
> connect because there was an error in a while loop which prevented
> iteration from taking place when there was only one active wifi
> hotspot.
>
> Please, note my graphical frontend does not use unnecessary cosmetics
> to make it look appealing to the eyes. My aim was simplicity and low
> use of system processing and memory. Moreover, the backend
> establishes a connection using low level calls to avoid using
> ifupdown. It uses instead ifconfig, iwconfig, wpa_supplicant and
> dhclient.
I'm working again on simple-netaid, and i 'd like to share with you the
C code

for bringing up/down a concrete network interface (void
interface_up/down, respectivelly):



/********         Bring up the interface                      *******/

void interface_up (const char *if_name)

{
    struct ifreq ifr;
    int skfd = 0;

    strncpy(ifr.ifr_name, if_name, IFNAMSIZ);

    /* Create a channel to the NET kernel. */
    if((skfd = iw_sockets_open()) < 0)
    {
        perror("socket");
        return -1;
    }

    skfd = socket (AF_INET, SOCK_DGRAM, 0);
    if (skfd && ioctl(skfd, SIOCGIFFLAGS, &ifr) >= 0) {
        printf("Activating interface %s", if_name);
        strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
        ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
        ioctl(skfd, SIOCSIFFLAGS, &ifr);
    } else {
        printf("Getting flags for interface %s failed, not activating
interface.", if_name);
    }

    /* Close the socket. */
    iw_sockets_close(skfd);

}


/********         Bring down the interface                      *******/

void interface_down (const char *if_name)
{
    struct ifreq ifr;
    int skfd = 0;

    strncpy(ifr.ifr_name, if_name, IFNAMSIZ);

    /* Create a channel to the NET kernel. */
    if((skfd = iw_sockets_open()) < 0)
    {
        perror("socket");
        return -1;
    }

    if (skfd && ioctl(skfd, SIOCGIFFLAGS, &ifr) >= 0) {
        printf("Taking down interface %s", if_name);
        strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
        ifr.ifr_flags &= ~IFF_UP;
        ioctl(skfd, SIOCSIFFLAGS, &ifr);
    } else {
        printf("Getting flags for interface %s failed, not taking down
interface.", if_name);
    }

    /* Close the socket. */
    iw_sockets_close(skfd);
}

HTH,

Aitor.