Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_config.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_config.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Load config file
%%% Created : 14 Dec 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2010 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_config).
-author('alexey@process-one.net').
-export([start/0, load_file/1,
add_global_option/2, add_local_option/2,
get_global_option/1, get_local_option/1]).
-export([get_vh_by_auth_method/1]).
-export([is_file_readable/1]).
-include("ejabberd.hrl").
-include("ejabberd_config.hrl").
-include_lib("kernel/include/file.hrl").
%% @type macro() = {macro_key(), macro_value()}
%% @type macro_key() = atom().
%% The atom must have all characters in uppercase.
%% @type macro_value() = term().
start() ->
mnesia:create_table(config,
[{disc_copies, [node()]},
{attributes, record_info(fields, config)}]),
mnesia:add_table_copy(config, node(), ram_copies),
mnesia:create_table(local_config,
[{disc_copies, [node()]},
{local_content, true},
{attributes, record_info(fields, local_config)}]),
mnesia:add_table_copy(local_config, node(), ram_copies),
Config = get_ejabberd_config_path(),
load_file(Config),
%% This start time is used by mod_last:
add_local_option(node_start, now()),
ok.
%% @doc Get the filename of the ejabberd configuration file.
%% The filename can be specified with: erl -config "/path/to/ejabberd.cfg".
%% It can also be specified with the environtment variable EJABBERD_CONFIG_PATH.
%% If not specified, the default value 'ejabberd.cfg' is assumed.
%% @spec () -> string()
get_ejabberd_config_path() ->
case application:get_env(config) of
{ok, Path} -> Path;
undefined ->
case os:getenv("EJABBERD_CONFIG_PATH") of
false ->
?CONFIG_PATH;
Path ->
Path
end
end.
%% @doc Load the ejabberd configuration file.
%% It also includes additional configuration files and replaces macros.
%% This function will crash if finds some error in the configuration file.
%% @spec (File::string()) -> ok
load_file(File) ->
Terms = get_plain_terms_file(File),
State = lists:foldl(fun search_hosts/2, #state{}, Terms),
Terms_macros = replace_macros(Terms),
Res = lists:foldl(fun process_term/2, State, Terms_macros),
set_opts(Res).
%% @doc Read an ejabberd configuration file and return the terms.
%% Input is an absolute or relative path to an ejabberd config file.
%% Returns a list of plain terms,
%% in which the options 'include_config_file' were parsed
%% and the terms in those files were included.
%% @spec(string()) -> [term()]
get_plain_terms_file(File1) ->
File = get_absolute_path(File1),
case file:consult(File) of
{ok, Terms} ->
include_config_files(Terms);
{error, {LineNumber, erl_parse, _ParseMessage} = Reason} ->
ExitText = describe_config_problem(File, Reason, LineNumber),
?ERROR_MSG(ExitText, []),
exit_or_halt(ExitText);
{error, Reason} ->
ExitText = describe_config_problem(File, Reason),
?ERROR_MSG(ExitText, []),
exit_or_halt(ExitText)
end.
%% @doc Convert configuration filename to absolute path.
%% Input is an absolute or relative path to an ejabberd configuration file.
%% And returns an absolute path to the configuration file.
%% @spec (string()) -> string()
get_absolute_path(File) ->
case filename:pathtype(File) of
absolute ->
File;
relative ->
Config_path = get_ejabberd_config_path(),
Config_dir = filename:dirname(Config_path),
filename:absname_join(Config_dir, File)
end.
search_hosts(Term, State) ->
case Term of
{host, Host} ->
if
State#state.hosts == [] ->
add_hosts_to_option([Host], State);
true ->
?ERROR_MSG("Can't load config file: "
"too many hosts definitions", []),
exit("too many hosts definitions")
end;
{hosts, Hosts} ->
if
State#state.hosts == [] ->
add_hosts_to_option(Hosts, State);
true ->
?ERROR_MSG("Can't load config file: "
"too many hosts definitions", []),
exit("too many hosts definitions")
end;
_ ->
State
end.
add_hosts_to_option(Hosts, State) ->
PrepHosts = normalize_hosts(Hosts),
add_option(hosts, PrepHosts, State#state{hosts = PrepHosts}).
normalize_hosts(Hosts) ->
normalize_hosts(Hosts,[]).
normalize_hosts([], PrepHosts) ->
lists:reverse(PrepHosts);
normalize_hosts([Host|Hosts], PrepHosts) ->
try
PrepHost = exmpp_stringprep:nodeprep(Host),
normalize_hosts(Hosts, [PrepHost|PrepHosts])
catch
_ ->
?ERROR_MSG("Can't load config file: "
"invalid host name [~p]", [Host]),
exit("invalid hostname")
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Errors reading the config file
describe_config_problem(Filename, Reason) ->
Text1 = lists:flatten("Problem loading ejabberd config file " ++ Filename),
Text2 = lists:flatten(" : " ++ file:format_error(Reason)),
ExitText = Text1 ++ Text2,
ExitText.
describe_config_problem(Filename, Reason, LineNumber) ->
Text1 = lists:flatten("Problem loading ejabberd config file " ++ Filename),
Text2 = lists:flatten(" approximately in the line "
++ file:format_error(Reason)),
ExitText = Text1 ++ Text2,
Lines = get_config_lines(Filename, LineNumber, 10, 3),
?ERROR_MSG("The following lines from your configuration file might be"
" relevant to the error: ~n~s", [Lines]),
ExitText.
get_config_lines(Filename, TargetNumber, PreContext, PostContext) ->
{ok, Fd} = file:open(Filename, [read]),
LNumbers = lists:seq(TargetNumber-PreContext, TargetNumber+PostContext),
NextL = io:get_line(Fd, no_prompt),
R = get_config_lines2(Fd, NextL, 1, LNumbers, []),
file:close(Fd),
R.
get_config_lines2(_Fd, eof, _CurrLine, _LNumbers, R) ->
lists:reverse(R);
get_config_lines2(_Fd, _NewLine, _CurrLine, [], R) ->
lists:reverse(R);
get_config_lines2(Fd, Data, CurrLine, [NextWanted | LNumbers], R) when is_list(Data) ->
NextL = io:get_line(Fd, no_prompt),
if
CurrLine >= NextWanted ->
Line2 = [integer_to_list(CurrLine), ": " | Data],
get_config_lines2(Fd, NextL, CurrLine+1, LNumbers, [Line2 | R]);
true ->
get_config_lines2(Fd, NextL, CurrLine+1, [NextWanted | LNumbers], R)
end.
%% If ejabberd isn't yet running in this node, then halt the node
exit_or_halt(ExitText) ->
case [Vsn || {ejabberd, _Desc, Vsn} <- application:which_applications()] of
[] ->
timer:sleep(1000),
halt(ExitText);
[_] ->
exit(ExitText)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Support for 'include_config_file'
%% @doc Include additional configuration files in the list of terms.
%% @spec ([term()]) -> [term()]
include_config_files(Terms) ->
include_config_files(Terms, []).
include_config_files([], Res) ->
Res;
include_config_files([{include_config_file, Filename} | Terms], Res) ->
include_config_files([{include_config_file, Filename, []} | Terms], Res);
include_config_files([{include_config_file, Filename, Options} | Terms], Res) ->
Included_terms = get_plain_terms_file(Filename),
Disallow = proplists:get_value(disallow, Options, []),
Included_terms2 = delete_disallowed(Disallow, Included_terms),
Allow_only = proplists:get_value(allow_only, Options, all),
Included_terms3 = keep_only_allowed(Allow_only, Included_terms2),
include_config_files(Terms, Res ++ Included_terms3);
include_config_files([Term | Terms], Res) ->
include_config_files(Terms, Res ++ [Term]).
%% @doc Filter from the list of terms the disallowed.
%% Returns a sublist of Terms without the ones which first element is
%% included in Disallowed.
%% @spec (Disallowed::[atom()], Terms::[term()]) -> [term()]
delete_disallowed(Disallowed, Terms) ->
lists:foldl(
fun(Dis, Ldis) ->
delete_disallowed2(Dis, Ldis)
end,
Terms,
Disallowed).
delete_disallowed2(Disallowed, [H|T]) ->
case element(1, H) of
Disallowed ->
?WARNING_MSG("The option '~p' is disallowed, "
"and will not be accepted", [Disallowed]),
delete_disallowed2(Disallowed, T);
_ ->
[H|delete_disallowed2(Disallowed, T)]
end;
delete_disallowed2(_, []) ->
[].
%% @doc Keep from the list only the allowed terms.
%% Returns a sublist of Terms with only the ones which first element is
%% included in Allowed.
%% @spec (Allowed::[atom()], Terms::[term()]) -> [term()]
keep_only_allowed(all, Terms) ->
Terms;
keep_only_allowed(Allowed, Terms) ->
{As, NAs} = lists:partition(
fun(Term) ->
lists:member(element(1, Term), Allowed)
end,
Terms),
[?WARNING_MSG("This option is not allowed, "
"and will not be accepted:~n~p", [NA])
|| NA <- NAs],
As.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Support for Macro
%% @doc Replace the macros with their defined values.
%% @spec (Terms::[term()]) -> [term()]
replace_macros(Terms) ->
{TermsOthers, Macros} = split_terms_macros(Terms),
replace(TermsOthers, Macros).
%% @doc Split Terms into normal terms and macro definitions.
%% @spec (Terms) -> {Terms, Macros}
%% Terms = [term()]
%% Macros = [macro()]
split_terms_macros(Terms) ->
lists:foldl(
fun(Term, {TOs, Ms}) ->
case Term of
{define_macro, Key, Value} ->
case is_atom(Key) and is_all_uppercase(Key) of
true ->
{TOs, Ms++[{Key, Value}]};
false ->
exit({macro_not_properly_defined, Term})
end;
Term ->
{TOs ++ [Term], Ms}
end
end,
{[], []},
Terms).
%% @doc Recursively replace in Terms macro usages with the defined value.
%% @spec (Terms, Macros) -> Terms
%% Terms = [term()]
%% Macros = [macro()]
replace([], _) ->
[];
replace([Term|Terms], Macros) ->
[replace_term(Term, Macros) | replace(Terms, Macros)].
replace_term(Key, Macros) when is_atom(Key) ->
case is_all_uppercase(Key) of
true ->
case proplists:get_value(Key, Macros) of
undefined -> exit({undefined_macro, Key});
Value -> Value
end;
false ->
Key
end;
replace_term({use_macro, Key, Value}, Macros) ->
proplists:get_value(Key, Macros, Value);
replace_term(Term, Macros) when is_list(Term) ->
replace(Term, Macros);
replace_term(Term, Macros) when is_tuple(Term) ->
List = tuple_to_list(Term),
List2 = replace(List, Macros),
list_to_tuple(List2);
replace_term(Term, _) ->
Term.
is_all_uppercase(Atom) ->
String = erlang:atom_to_list(Atom),
lists:all(fun(C) when C >= $a, C =< $z -> false;
(_) -> true
end, String).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Process terms
process_term(Term, State) ->
case Term of
override_global ->
State#state{override_global = true};
override_local ->
State#state{override_local = true};
override_acls ->
State#state{override_acls = true};
{acl, _ACLName, _ACLData} ->
process_host_term(Term, global, State);
{access, _RuleName, _Rules} ->
process_host_term(Term, global, State);
{shaper, _Name, _Data} ->
%%lists:foldl(fun(Host, S) -> process_host_term(Term, Host, S) end,
%% State, State#state.hosts);
process_host_term(Term, global, State);
{host, _Host} ->
State;
{hosts, _Hosts} ->
State;
{host_config, Host, Terms} ->
lists:foldl(fun(T, S) -> process_host_term(T, Host, S) end,
State, Terms);
{listen, Listeners} ->
Listeners2 =
lists:map(
fun({PortIP, Module, Opts}) ->
{Port, IPT, _, _, Proto, OptsClean} =
ejabberd_listener:parse_listener_portip(PortIP, Opts),
{{Port, IPT, Proto}, Module, OptsClean}
end,
Listeners),
add_option(listen, Listeners2, State);
{language, Val} ->
add_option(language, Val, State);
{outgoing_s2s_port, Port} ->
add_option(outgoing_s2s_port, Port, State);
{outgoing_s2s_options, Methods, Timeout} ->
add_option(outgoing_s2s_options, {Methods, Timeout}, State);
{s2s_dns_options, PropList} ->
add_option(s2s_dns_options, PropList, State);
{s2s_use_starttls, Port} ->
add_option(s2s_use_starttls, Port, State);
{s2s_certfile, CertFile} ->
case ejabberd_config:is_file_readable(CertFile) of
true -> add_option(s2s_certfile, CertFile, State);
false ->
ErrorText = "There is a problem in the configuration: "
"the specified file is not readable: ",
throw({error, ErrorText ++ CertFile})
end;
{domain_certfile, Domain, CertFile} ->
case ejabberd_config:is_file_readable(CertFile) of
true -> add_option({domain_certfile, Domain}, CertFile, State);
false ->
ErrorText = "There is a problem in the configuration: "
"the specified file is not readable: ",
throw({error, ErrorText ++ CertFile})
end;
{node_type, NodeType} ->
add_option(node_type, NodeType, State);
{cluster_nodes, Nodes} ->
add_option(cluster_nodes, Nodes, State);
{domain_balancing, Domain, Balancing} ->
add_option({domain_balancing, Domain}, Balancing, State);
{domain_balancing_component_number, Domain, N} ->
add_option({domain_balancing_component_number, Domain}, N, State);
{watchdog_admins, Admins} ->
add_option(watchdog_admins, Admins, State);
{watchdog_large_heap, LH} ->
add_option(watchdog_large_heap, LH, State);
{registration_timeout, Timeout} ->
add_option(registration_timeout, Timeout, State);
{ejabberdctl_access_commands, ACs} ->
add_option(ejabberdctl_access_commands, ACs, State);
{captcha_cmd, Cmd} ->
add_option(captcha_cmd, Cmd, State);
{captcha_host, Host} ->
add_option(captcha_host, Host, State);
{loglevel, Loglevel} ->
ejabberd_loglevel:set(Loglevel),
State;
{max_fsm_queue, N} ->
add_option(max_fsm_queue, N, State);
{_Opt, _Val} ->
lists:foldl(fun(Host, S) -> process_host_term(Term, Host, S) end,
State, State#state.hosts)
end.
process_host_term(Term, Host, State) ->
case Term of
{acl, ACLName, ACLData} ->
State#state{opts =
[acl:to_record(Host, ACLName, ACLData) | State#state.opts]};
{access, RuleName, Rules} ->
State#state{opts = [#config{key = {access, RuleName, Host},
value = Rules} |
State#state.opts]};
{shaper, Name, Data} ->
State#state{opts = [#config{key = {shaper, Name, Host},
value = Data} |
State#state.opts]};
{host, Host} ->
State;
{hosts, _Hosts} ->
State;
{odbc_server, ODBC_server} ->
add_option({odbc_server, Host}, ODBC_server, State);
{Opt, Val} ->
add_option({Opt, Host}, Val, State)
end.
add_option(Opt, Val, State) ->
Table = case Opt of
hosts ->
config;
language ->
config;
_ ->
local_config
end,
case Table of
config ->
State#state{opts = [#config{key = Opt, value = Val} |
State#state.opts]};
local_config ->
case Opt of
{{add, OptName}, Host} ->
State#state{opts = compact({OptName, Host}, Val,
State#state.opts, [])};
_ ->
State#state{opts = [#local_config{key = Opt, value = Val} |
State#state.opts]}
end
end.
compact({OptName, Host} = Opt, Val, [], Os) ->
?WARNING_MSG("The option '~p' is defined for the host ~p using host_config "
"before the global '~p' option. This host_config option may get overwritten.", [OptName, Host, OptName]),
[#local_config{key = Opt, value = Val}] ++ Os;
%% Traverse the list of the options already parsed
compact(Opt, Val, [O | Os1], Os2) ->
case catch O#local_config.key of
%% If the key of a local_config matches the Opt that wants to be added
Opt ->
%% Then prepend the new value to the list of old values
Os2 ++ [#local_config{key = Opt,
value = Val++O#local_config.value}
] ++ Os1;
_ ->
compact(Opt, Val, Os1, Os2++[O])
end.
set_opts(State) ->
Opts = lists:reverse(State#state.opts),
F = fun() ->
if
State#state.override_global ->
Ksg = mnesia:all_keys(config),
lists:foreach(fun(K) ->
mnesia:delete({config, K})
end, Ksg);
true ->
ok
end,
if
State#state.override_local ->
Ksl = mnesia:all_keys(local_config),
lists:foreach(fun(K) ->
mnesia:delete({local_config, K})
end, Ksl);
true ->
ok
end,
if
State#state.override_acls ->
Ksa = mnesia:all_keys(acl),
lists:foreach(fun(K) ->
mnesia:delete({acl, K})
end, Ksa);
true ->
ok
end,
lists:foreach(fun(R) ->
mnesia:write(R)
end, Opts)
end,
case mnesia:transaction(F) of
{atomic, _} -> ok;
{aborted,{no_exists,Table}} ->
MnesiaDirectory = mnesia:system_info(directory),
?ERROR_MSG("Error reading Mnesia database spool files:~n"
"The Mnesia database couldn't read the spool file for the table '~p'.~n"
"ejabberd needs read and write access in the directory:~n ~s~n"
"Maybe the problem is a change in the computer hostname,~n"
"or a change in the Erlang node name, which is currently:~n ~p~n"
"Check the ejabberd guide for details about changing the~n"
"computer hostname or Erlang node name.~n",
[Table, MnesiaDirectory, node()]),
exit("Error reading Mnesia database")
end.
add_global_option(Opt, Val) ->
mnesia:transaction(fun() ->
mnesia:write(#config{key = Opt,
value = Val})
end).
add_local_option(Opt, Val) ->
mnesia:transaction(fun() ->
mnesia:write(#local_config{key = Opt,
value = Val})
end).
get_global_option(Opt) ->
case ets:lookup(config, Opt) of
[#config{value = Val}] ->
Val;
_ ->
undefined
end.
get_local_option(Opt) ->
case ets:lookup(local_config, Opt) of
[#local_config{value = Val}] ->
Val;
_ ->
undefined
end.
%% Return the list of hosts handled by a given module
get_vh_by_auth_method(AuthMethod) ->
mnesia:dirty_select(local_config,
[{#local_config{key = {auth_method, '$1'},
value=AuthMethod},[],['$1']}]).
%% @spec (Path::string()) -> true | false
is_file_readable(Path) ->
case file:read_file_info(Path) of
{ok, FileInfo} ->
case {FileInfo#file_info.type, FileInfo#file_info.access} of
{regular, read} -> true;
{regular, read_write} -> true;
_ -> false
end;
{error, _Reason} ->
false
end.
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