晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Disable EC2 Metadata: Disable AWS EC2 metadata."""

import logging
from textwrap import dedent

from cloudinit import subp, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.distros import ALL_DISTROS
from cloudinit.settings import PER_ALWAYS

REJECT_CMD_IF = ["route", "add", "-host", "169.254.169.254", "reject"]
REJECT_CMD_IP = ["ip", "route", "add", "prohibit", "169.254.169.254"]

LOG = logging.getLogger(__name__)

meta: MetaSchema = {
    "id": "cc_disable_ec2_metadata",
    "name": "Disable EC2 Metadata",
    "title": "Disable AWS EC2 Metadata",
    "description": dedent(
        """\
        This module can disable the ec2 datasource by rejecting the route to
        ``169.254.169.254``, the usual route to the datasource. This module
        is disabled by default."""
    ),
    "distros": [ALL_DISTROS],
    "frequency": PER_ALWAYS,
    "examples": ["disable_ec2_metadata: true"],
    "activate_by_schema_keys": ["disable_ec2_metadata"],
}

__doc__ = get_meta_doc(meta)


def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
    disabled = util.get_cfg_option_bool(cfg, "disable_ec2_metadata", False)
    if disabled:
        reject_cmd = None
        if subp.which("ip"):
            reject_cmd = REJECT_CMD_IP
        elif subp.which("ifconfig"):
            reject_cmd = REJECT_CMD_IF
        else:
            LOG.error(
                'Neither "route" nor "ip" command found, unable to '
                "manipulate routing table"
            )
            return
        subp.subp(reject_cmd, capture=False)
    else:
        LOG.debug(
            "Skipping module named %s, disabling the ec2 route not enabled",
            name,
        )

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