1## This Source Code Form is subject to the terms of the Mozilla Public
2## License, v. 2.0. If a copy of the MPL was not distributed with this
3## file, You can obtain one at https://mozilla.org/MPL/2.0/.
4##
5## Copyright (c) 2007-2021 VMware, Inc. or its affiliates.  All rights reserved.
6
7defmodule RabbitMQ.CLI.Diagnostics.Commands.ResolverInfoCommand do
8  @moduledoc """
9  Displays effective hostname resolver (inetrc) configuration on target node
10  """
11
12  import RabbitMQ.CLI.Core.Platform, only: [line_separator: 0]
13  import RabbitMQ.CLI.Core.ANSI, only: [bright: 1]
14  alias RabbitMQ.CLI.Core.Networking
15
16  @behaviour RabbitMQ.CLI.CommandBehaviour
17
18  def scopes(), do: [:diagnostics]
19
20  def switches(), do: [offline: :boolean]
21  def aliases(), do: []
22
23  def merge_defaults(args, opts) do
24    {args, Map.merge(%{offline: false}, opts)}
25  end
26
27  def validate(args, _) when length(args) > 0, do: {:validation_failure, :too_many_args}
28  def validate([], _), do: :ok
29
30  def run([], %{offline: true}) do
31    Networking.inetrc_map(:inet.get_rc())
32  end
33  def run([], %{node: node_name, timeout: timeout, offline: false}) do
34    case :rabbit_misc.rpc_call(node_name, :inet, :get_rc, [], timeout) do
35      {:error, _} = err -> err
36      {:error, _, _} = err -> err
37      xs when is_list(xs) -> Networking.inetrc_map(xs)
38      other -> other
39    end
40  end
41
42  def output(info, %{node: node_name, formatter: "json"}) do
43    {:ok, %{
44      "result"   => "ok",
45      "node"     => node_name,
46      "resolver" => info
47    }}
48  end
49  def output(info, _opts) do
50    main_section = [
51      "#{bright("Runtime Hostname Resolver (inetrc) Settings")}\n",
52      "Lookup order: #{info["lookup"]}",
53      "Hosts file: #{info["hosts_file"]}",
54      "Resolver conf file: #{info["resolv_conf"]}",
55      "Cache size: #{info["cache_size"]}"
56    ]
57    hosts_section = [
58      "\n#{bright("inetrc File Host Entries")}\n"
59    ] ++ case info["hosts"] do
60      []  -> ["(none)"]
61      nil -> ["(none)"]
62      hs  -> Enum.reduce(hs, [], fn {k, v}, acc -> ["#{k} #{Enum.join(v, ", ")}" | acc] end)
63    end
64
65    lines = main_section ++ hosts_section
66
67    {:ok, Enum.join(lines, line_separator())}
68  end
69
70  def usage() do
71    "resolver_info"
72  end
73
74  def help_section(), do: :configuration
75
76  def description(), do: "Displays effective hostname resolver (inetrc) configuration on target node"
77
78  def banner(_, %{node: node_name, offline: false}) do
79    "Asking node #{node_name} for its effective hostname resolver (inetrc) configuration..."
80  end
81  def banner(_, %{offline: true}) do
82    "Displaying effective hostname resolver (inetrc) configuration used by CLI tools..."
83  end
84end
85