mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-26 16:26:24 +01:00
204 lines
8.2 KiB
Erlang
204 lines
8.2 KiB
Erlang
%%%----------------------------------------------------------------------
|
|
%%% File : mod_echo.erl
|
|
%%% Author : Alexey Shchepin <alexey@process-one.net>
|
|
%%% Purpose : Simple ejabberd module.
|
|
%%% Created : 15 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
|
|
%%%
|
|
%%%
|
|
%%% ejabberd, Copyright (C) 2002-2009 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(mod_echo).
|
|
-author('alexey@process-one.net').
|
|
|
|
-behaviour(gen_server).
|
|
-behaviour(gen_mod).
|
|
|
|
%% API
|
|
-export([start_link/2, start/2, stop/1]).
|
|
|
|
%% gen_server callbacks
|
|
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
|
|
terminate/2, code_change/3]).
|
|
|
|
-include_lib("exmpp/include/exmpp.hrl").
|
|
|
|
-include("ejabberd.hrl").
|
|
|
|
-record(state, {host}).
|
|
|
|
-define(PROCNAME, ejabberd_mod_echo).
|
|
|
|
%%====================================================================
|
|
%% API
|
|
%%====================================================================
|
|
%%--------------------------------------------------------------------
|
|
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
|
|
%% Description: Starts the server
|
|
%%--------------------------------------------------------------------
|
|
start_link(Host, Opts) ->
|
|
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
|
|
gen_server:start_link({local, Proc}, ?MODULE, [Host, Opts], []).
|
|
|
|
start(Host, Opts) ->
|
|
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
|
|
ChildSpec =
|
|
{Proc,
|
|
{?MODULE, start_link, [Host, Opts]},
|
|
temporary,
|
|
1000,
|
|
worker,
|
|
[?MODULE]},
|
|
supervisor:start_child(ejabberd_sup, ChildSpec).
|
|
|
|
stop(Host) ->
|
|
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
|
|
gen_server:call(Proc, stop),
|
|
supervisor:terminate_child(ejabberd_sup, Proc),
|
|
supervisor:delete_child(ejabberd_sup, Proc).
|
|
|
|
|
|
%%====================================================================
|
|
%% gen_server callbacks
|
|
%%====================================================================
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: init(Args) -> {ok, State} |
|
|
%% {ok, State, Timeout} |
|
|
%% ignore |
|
|
%% {stop, Reason}
|
|
%% Description: Initiates the server
|
|
%%--------------------------------------------------------------------
|
|
init([Host, Opts]) ->
|
|
MyHost = gen_mod:get_opt_host(Host, Opts, "echo.@HOST@"),
|
|
ejabberd_router:register_route(MyHost),
|
|
{ok, #state{host = MyHost}}.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
|
|
%% {reply, Reply, State, Timeout} |
|
|
%% {noreply, State} |
|
|
%% {noreply, State, Timeout} |
|
|
%% {stop, Reason, Reply, State} |
|
|
%% {stop, Reason, State}
|
|
%% Description: Handling call messages
|
|
%%--------------------------------------------------------------------
|
|
handle_call(stop, _From, State) ->
|
|
{stop, normal, ok, State}.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: handle_cast(Msg, State) -> {noreply, State} |
|
|
%% {noreply, State, Timeout} |
|
|
%% {stop, Reason, State}
|
|
%% Description: Handling cast messages
|
|
%%--------------------------------------------------------------------
|
|
handle_cast(_Msg, State) ->
|
|
{noreply, State}.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: handle_info(Info, State) -> {noreply, State} |
|
|
%% {noreply, State, Timeout} |
|
|
%% {stop, Reason, State}
|
|
%% Description: Handling all non call/cast messages
|
|
%%--------------------------------------------------------------------
|
|
handle_info({route, From, To, Packet}, State) ->
|
|
Packet2 = case exmpp_jid:node(From) of
|
|
undefined -> exmpp_stanza:reply_with_error(Packet, 'bad-request');
|
|
_ -> Packet
|
|
end,
|
|
do_client_version(disabled, To, From), % Put 'enabled' to enable it
|
|
ejabberd_router:route(To, From, Packet2),
|
|
{noreply, State};
|
|
handle_info(_Info, State) ->
|
|
{noreply, State}.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Function: terminate(Reason, State) -> void()
|
|
%% Description: This function is called by a gen_server when it is about to
|
|
%% terminate. It should be the opposite of Module:init/1 and do any necessary
|
|
%% cleaning up. When it returns, the gen_server terminates with Reason.
|
|
%% The return value is ignored.
|
|
%%--------------------------------------------------------------------
|
|
terminate(_Reason, State) ->
|
|
ejabberd_router:unregister_route(State#state.host),
|
|
ok.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
|
|
%% Description: Convert process state when code is changed
|
|
%%--------------------------------------------------------------------
|
|
code_change(_OldVsn, State, _Extra) ->
|
|
{ok, State}.
|
|
|
|
%%--------------------------------------------------------------------
|
|
%% Example of routing XMPP packets using Erlang's message passing
|
|
%%--------------------------------------------------------------------
|
|
|
|
%% To enable this educational example, edit the function handle_info:
|
|
%% replace the argument 'disabled' with 'enabled' in the call to the
|
|
%% function do_client_version.
|
|
|
|
%% ejabberd provides a method to receive XMPP packets using Erlang's
|
|
%% message passing mechanism.
|
|
%%
|
|
%% The packets received by ejabberd are sent
|
|
%% to the local destination process by sending an Erlang message.
|
|
%% This means that you can receive XMPP stanzas in an Erlang process
|
|
%% using Erlang's Receive, as long as this process is registered in
|
|
%% ejabberd as the process which handles the destination JID.
|
|
%%
|
|
%% This example function is called when a client queries the echo service.
|
|
%% This function then sends a query to the client, and waits 5 seconds to
|
|
%% receive an answer. The answer will only be accepted if it was sent
|
|
%% using exactly the same JID. We add a (mostly) random resource to
|
|
%% try to guarantee that the received response matches the request sent.
|
|
%% Finally, the received response is printed in the ejabberd log file.
|
|
do_client_version(disabled, _From, _To) ->
|
|
ok;
|
|
do_client_version(enabled, From, To) ->
|
|
%% It is important to identify this process and packet
|
|
Random_resource = integer_to_list(random:uniform(100000)),
|
|
From2 = exmpp_jid:full(From,Random_resource),
|
|
|
|
%% Build an iq:query request
|
|
Request = #xmlel{ns = ?NS_SOFT_VERSION, name = 'query'},
|
|
Packet = exmpp_stanza:set_recipient(
|
|
exmpp_iq:get(?NS_JABBER_CLIENT, Request),
|
|
To),
|
|
|
|
%% Send the request
|
|
ejabberd_router:route(From2, To, Packet),
|
|
|
|
%% Wait to receive the response
|
|
%% It is very important to only accept a packet which is the
|
|
%% response to the request that he sent
|
|
Els = receive {route, To, From2, IQ} ->
|
|
#xmlel{ns = ?NS_SOFT_VERSION, name = 'query', children = List} = exmpp_iq:get_payload(IQ),
|
|
List
|
|
after 5000 -> % Timeout in miliseconds: 5 seconds
|
|
[]
|
|
end,
|
|
Values = [{Name, exmpp_xml:get_cdata_as_list(El)} || #xmlel{name = Name} = El <- Els],
|
|
|
|
%% Print in log
|
|
Values_string1 = [io_lib:format("~n~s: ~p", [N, V]) || {N, V} <- Values],
|
|
Values_string2 = lists:concat(Values_string1),
|
|
?INFO_MSG("Information of the client: ~s~s", [exmpp_jid:jid_to_binary(To), Values_string2]).
|
|
|