utils.py 文件源码

def is_valid_cidr(address):
    """Check if the provided ipv4 or ipv6 address is a valid CIDR address."""
    try:
        # Validate the correct CIDR Address
        netaddr.IPNetwork(address)
    except netaddr.core.AddrFormatError:
        return False
    except UnboundLocalError:
        # NOTE(MotoKen): work around bug in netaddr 0.7.5 (see detail in
        # https://github.com/drkjam/netaddr/issues/2)
        return False

    # Prior validation partially verify /xx part
    # Verify it here
    ip_segment = address.split('/')

    if (len(ip_segment) <= 1 or ip_segment[1] == ''):
        return False

    return True