interface.py 文件源码

def source_interface(address, port=80, ip_version=None):
    """Figure out what local interface is being used to
    reach an address.

    Returns a tuple of (address, interface_name)
    """

    sock = socket.socket(
        socket.AF_INET6 if ip_version == 6 else socket.AF_INET,
        socket.SOCK_DGRAM)
    try:
        sock.connect((address, port))
    except socket.error:
        return (None, None)

    interface_address = sock.getsockname()[0]

    sock.close()

    interface_name = address_interface(interface_address, ip_version=ip_version)

    if interface_name:
        return (interface_address, interface_name)

    return (None, None)