detect.py 文件源码

def get_interface_mac(sock: socket.socket, ifname: str) -> str:
    """Obtain a network interface's MAC address, as a string."""
    ifreq = struct.pack(b'256s', ifname.encode('utf-8')[:15])
    try:
        info = fcntl.ioctl(sock.fileno(), SIOCGIFHWADDR, ifreq)
    except OSError as e:
        if e.errno is not None and e.errno == errno.ENODEV:
            raise InterfaceNotFound(
                "Interface not found: '%s'." % ifname)
        else:
            raise MACAddressNotAvailable(
                "Failed to get MAC address for '%s': %s." % (
                    ifname, strerror(e.errno)))
    else:
        # Of course we're sure these are the correct indexes into the `ifreq`.
        # Also, your lack of faith is disturbing.
        mac = ''.join('%02x:' % char for char in info[18:24])[:-1]
    return mac