C++ (Cpp) real_getifaddrs Examples

Example #1

File: dev_eth_tap.c Project: tuyenth/RIOT

static int _init(dev_eth_t *ethdev)
{
    dev_eth_tap_t *dev = (dev_eth_tap_t*)ethdev;

    /* check device parametrs */
    if (dev == NULL) {
        return -ENODEV;
    }

    char *name = dev->tap_name;
#ifdef __MACH__ /* OSX */
    char clonedev[255] = "/dev/"; /* XXX bad size */
    strncpy(clonedev + 5, name, 250);
#elif defined(__FreeBSD__)
    char clonedev[255] = "/dev/"; /* XXX bad size */
    strncpy(clonedev + 5, name, 250);
#else /* Linux */
    struct ifreq ifr;
    const char *clonedev = "/dev/net/tun";
#endif
    /* initialize device descriptor */
    dev->promiscous = 0;
    /* implicitly create the tap interface */
    if ((dev->tap_fd = real_open(clonedev , O_RDWR)) == -1) {
        err(EXIT_FAILURE, "open(%s)", clonedev);
    }
#if (defined(__MACH__) || defined(__FreeBSD__)) /* OSX/FreeBSD */
    struct ifaddrs *iflist;
    if (real_getifaddrs(&iflist) == 0) {
        for (struct ifaddrs *cur = iflist; cur; cur = cur->ifa_next) {
            if ((cur->ifa_addr->sa_family == AF_LINK) && (strcmp(cur->ifa_name, name) == 0) && cur->ifa_addr) {
                struct sockaddr_dl *sdl = (struct sockaddr_dl *)cur->ifa_addr;
                memcpy(dev->addr, LLADDR(sdl), sdl->sdl_alen);
                break;
            }
        }
        real_freeifaddrs(iflist);
    }
#else /* Linux */
    memset(&ifr, 0, sizeof(ifr));
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    strncpy(ifr.ifr_name, name, IFNAMSIZ);
    if (real_ioctl(dev->tap_fd, TUNSETIFF, (void *)&ifr) == -1) {
        _native_in_syscall++;
        warn("ioctl TUNSETIFF");
        warnx("probably the tap interface (%s) does not exist or is already in use", name);
        real_exit(EXIT_FAILURE);
    }

    /* get MAC address */
    memset(&ifr, 0, sizeof(ifr));
    snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", name);
    if (real_ioctl(dev->tap_fd, SIOCGIFHWADDR, &ifr) == -1) {
        _native_in_syscall++;
        warn("ioctl SIOCGIFHWADDR");
        if (real_close(dev->tap_fd) == -1) {
            warn("close");
        }
        real_exit(EXIT_FAILURE);
    }
    memcpy(dev->addr, ifr.ifr_hwaddr.sa_data, NG_ETHERNET_ADDR_LEN);

    /* change mac addr so it differs from what the host is using */
    dev->addr[5]++;
#endif
    DEBUG("ng_tapnet_init(): dev->addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
            dev->addr[0], dev->addr[1], dev->addr[2],
            dev->addr[3], dev->addr[4], dev->addr[5]);
    /* configure signal handler for fds */
    register_interrupt(SIGIO, _tap_isr);
#ifdef __MACH__
    /* tuntap signalled IO is not working in OSX,
     * * check http://sourceforge.net/p/tuntaposx/bugs/17/ */
    _sigio_child(dev);
#else
    /* configure fds to send signals on io */
    if (fcntl(dev->tap_fd, F_SETOWN, _native_pid) == -1) {
        err(EXIT_FAILURE, "ng_tapnet_init(): fcntl(F_SETOWN)");
    }
    /* set file access mode to non-blocking */
    if (fcntl(dev->tap_fd, F_SETFL, O_NONBLOCK | O_ASYNC) == -1) {
        err(EXIT_FAILURE, "ng_tabnet_init(): fcntl(F_SETFL)");
    }
#endif /* not OSX */
    DEBUG("ng_tapnet: initialized.\n");
    return 0;
}

Example #2

File: netdev2_tap.c Project: francois-berder-imgtec/RIOT

static int _init(netdev2_t *netdev)
{
    DEBUG("%s:%s:%u\n", RIOT_FILE_RELATIVE, __func__, __LINE__);

    netdev2_tap_t *dev = (netdev2_tap_t*)netdev;

    /* check device parametrs */
    if (dev == NULL) {
        return -ENODEV;
    }

    char *name = dev->tap_name;
#ifdef __MACH__ /* OSX */
    char clonedev[255] = "/dev/"; /* XXX bad size */
    strncpy(clonedev + 5, name, 250);
#elif defined(__FreeBSD__)
    char clonedev[255] = "/dev/"; /* XXX bad size */
    strncpy(clonedev + 5, name, 250);
#else /* Linux */
    struct ifreq ifr;
    const char *clonedev = "/dev/net/tun";
#endif
    /* initialize device descriptor */
    dev->promiscous = 0;
    /* implicitly create the tap interface */
    if ((dev->tap_fd = real_open(clonedev, O_RDWR | O_NONBLOCK)) == -1) {
        err(EXIT_FAILURE, "open(%s)", clonedev);
    }
#if (defined(__MACH__) || defined(__FreeBSD__)) /* OSX/FreeBSD */
    struct ifaddrs *iflist;
    if (real_getifaddrs(&iflist) == 0) {
        for (struct ifaddrs *cur = iflist; cur; cur = cur->ifa_next) {
            if ((cur->ifa_addr->sa_family == AF_LINK) && (strcmp(cur->ifa_name, name) == 0) && cur->ifa_addr) {
                struct sockaddr_dl *sdl = (struct sockaddr_dl *)cur->ifa_addr;
                memcpy(dev->addr, LLADDR(sdl), sdl->sdl_alen);
                break;
            }
        }
        real_freeifaddrs(iflist);
    }
#else /* Linux */
    memset(&ifr, 0, sizeof(ifr));
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    strncpy(ifr.ifr_name, name, IFNAMSIZ);
    if (real_ioctl(dev->tap_fd, TUNSETIFF, (void *)&ifr) == -1) {
        _native_in_syscall++;
        warn("ioctl TUNSETIFF");
        warnx("probably the tap interface (%s) does not exist or is already in use", name);
        real_exit(EXIT_FAILURE);
    }

    /* get MAC address */
    memset(&ifr, 0, sizeof(ifr));
    snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", name);
    if (real_ioctl(dev->tap_fd, SIOCGIFHWADDR, &ifr) == -1) {
        _native_in_syscall++;
        warn("ioctl SIOCGIFHWADDR");
        if (real_close(dev->tap_fd) == -1) {
            warn("close");
        }
        real_exit(EXIT_FAILURE);
    }
    memcpy(dev->addr, ifr.ifr_hwaddr.sa_data, ETHERNET_ADDR_LEN);

    /* change mac addr so it differs from what the host is using */
    dev->addr[5]++;
#endif
    DEBUG("gnrc_tapnet_init(): dev->addr = %02x:%02x:%02x:%02x:%02x:%02x\n",
            dev->addr[0], dev->addr[1], dev->addr[2],
            dev->addr[3], dev->addr[4], dev->addr[5]);

    /* configure signal handler for fds */
    native_async_read_setup();
    native_async_read_add_handler(dev->tap_fd, NULL, _tap_isr);

#ifdef MODULE_NETSTATS_L2
    memset(&netdev->stats, 0, sizeof(netstats_t));
#endif
    DEBUG("gnrc_tapnet: initialized.\n");
    return 0;
}