mirror of
https://github.com/processone/ejabberd.git
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138 lines
4.4 KiB
Erlang
138 lines
4.4 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : win32_dns.erl
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%%% Author : Geoff Cant
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%%% Purpose : Get name servers in a Windows machine
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%%% Created : 5 Mar 2009 by Geoff Cant
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(win32_dns).
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-export([get_nameservers/0]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-define(IF_KEY, "\\hklm\\system\\CurrentControlSet\\Services\\TcpIp\\Parameters\\Interfaces").
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-define(TOP_KEY, "\\hklm\\system\\CurrentControlSet\\Services\\TcpIp\\Parameters").
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get_nameservers() ->
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{_, Config} = pick_config(),
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IPTs = get_value(["NameServer"], Config),
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lists:filter(fun(IPTuple) -> is_good_ns(IPTuple) end, IPTs).
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is_good_ns(Addr) ->
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element(1,
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inet_res:nnslookup("a.root-servers.net", in, any, [{Addr,53}],
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timer:seconds(5)
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)
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) =:= ok.
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reg() ->
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{ok, R} = win32reg:open([read]),
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R.
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interfaces(R) ->
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ok = win32reg:change_key(R, ?IF_KEY),
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{ok, I} = win32reg:sub_keys(R),
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I.
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config_keys(R, Key) ->
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ok = win32reg:change_key(R, Key),
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[ {K,
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case win32reg:value(R, K) of
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{ok, V} -> try_translate(K, V);
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_ -> undefined
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end
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} || K <- ["Domain", "DhcpDomain",
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"NameServer", "DhcpNameServer", "SearchList"]].
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try_translate(K, V) ->
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try translate(K, V) of
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Res ->
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Res
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catch
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A:B ->
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?ERROR_MSG("Error '~p' translating Win32 registry~n"
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"K: ~p~nV: ~p~nError: ~p", [A, K, V, B]),
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undefined
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end.
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translate(NS, V) when NS =:= "NameServer"; NS =:= "DhcpNameServer" ->
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%% The IPs may be separated by commas ',' or by spaces " "
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%% The parts of an IP are separated by dots '.'
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IPsStrings = [string:tokens(IP, ".") || IP <- string:tokens(V, " ,")],
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[ list_to_tuple([list_to_integer(String) || String <- IpStrings])
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|| IpStrings <- IPsStrings];
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translate(_, V) -> V.
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interface_configs(R) ->
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[{If, config_keys(R, ?IF_KEY ++ "\\" ++ If)}
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|| If <- interfaces(R)].
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sort_configs(Configs) ->
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lists:sort(fun ({_, A}, {_, B}) ->
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ANS = proplists:get_value("NameServer", A),
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BNS = proplists:get_value("NameServer", B),
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if ANS =/= undefined, BNS =:= undefined -> false;
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true -> count_undef(A) < count_undef(B)
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end
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end,
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Configs).
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count_undef(L) when is_list(L) ->
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lists:foldl(fun ({_K, undefined}, Acc) -> Acc +1;
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({_K, []}, Acc) -> Acc +1;
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(_, Acc) -> Acc
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end, 0, L).
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all_configs() ->
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R = reg(),
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TopConfig = config_keys(R, ?TOP_KEY),
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Configs = [{top, TopConfig}
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| interface_configs(R)],
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win32reg:close(R),
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{TopConfig, Configs}.
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pick_config() ->
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{TopConfig, Configs} = all_configs(),
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NSConfigs = [{If, C} || {If, C} <- Configs,
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get_value(["DhcpNameServer","NameServer"], C)
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=/= undefined],
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case get_value(["DhcpNameServer","NameServer"],
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TopConfig) of
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%% No top level nameserver to pick interface with
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undefined ->
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hd(sort_configs(NSConfigs));
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%% Top level has a nameserver - use this to select an interface.
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NS ->
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Cs = [ {If, C}
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|| {If, C} <- Configs,
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lists:member(NS,
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[get_value(["NameServer"], C),
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get_value(["DhcpNameServer"], C)])],
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hd(sort_configs(Cs))
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end.
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get_value([], _Config) -> undefined;
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get_value([K|Keys], Config) ->
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case proplists:get_value(K, Config) of
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undefined -> get_value(Keys, Config);
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V -> V
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end.
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