mirror of
https://github.com/processone/ejabberd.git
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204 lines
8.1 KiB
Erlang
204 lines
8.1 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_echo.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Simple ejabberd module.
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%%% Created : 15 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2008 Process-one
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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
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(mod_echo).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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-behaviour(gen_mod).
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%% API
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-export([start_link/2, start/2, stop/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(state, {host}).
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-define(PROCNAME, ejabberd_mod_echo).
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%%====================================================================
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%% API
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
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%% Description: Starts the server
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%%--------------------------------------------------------------------
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start_link(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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gen_server:start_link({local, Proc}, ?MODULE, [Host, Opts], []).
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start(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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ChildSpec =
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{Proc,
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{?MODULE, start_link, [Host, Opts]},
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temporary,
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1000,
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worker,
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[?MODULE]},
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supervisor:start_child(ejabberd_sup, ChildSpec).
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stop(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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gen_server:call(Proc, stop),
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supervisor:terminate_child(ejabberd_sup, Proc),
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supervisor:delete_child(ejabberd_sup, Proc).
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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%%--------------------------------------------------------------------
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%% Function: init(Args) -> {ok, State} |
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%% {ok, State, Timeout} |
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%% ignore |
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%% {stop, Reason}
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%% Description: Initiates the server
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%%--------------------------------------------------------------------
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init([Host, Opts]) ->
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MyHost = gen_mod:get_opt_host(Host, Opts, "echo.@HOST@"),
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ejabberd_router:register_route(MyHost),
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{ok, #state{host = MyHost}}.
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%%--------------------------------------------------------------------
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%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
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%% {reply, Reply, State, Timeout} |
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%% {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, Reply, State} |
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%% {stop, Reason, State}
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%% Description: Handling call messages
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%%--------------------------------------------------------------------
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_cast(Msg, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling cast messages
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%%--------------------------------------------------------------------
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handle_cast(_Msg, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: handle_info(Info, State) -> {noreply, State} |
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%% {noreply, State, Timeout} |
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%% {stop, Reason, State}
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%% Description: Handling all non call/cast messages
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%%--------------------------------------------------------------------
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handle_info({route, From, To, Packet}, State) ->
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Packet2 = case From#jid.user of
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"" -> jlib:make_error_reply(Packet, ?ERR_BAD_REQUEST);
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_ -> Packet
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end,
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do_client_version(disabled, To, From), % Put 'enabled' to enable it
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ejabberd_router:route(To, From, Packet2),
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{noreply, State};
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handle_info(_Info, State) ->
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{noreply, State}.
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%%--------------------------------------------------------------------
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%% Function: terminate(Reason, State) -> void()
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%% Description: This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any necessary
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%% cleaning up. When it returns, the gen_server terminates with Reason.
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%% The return value is ignored.
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%%--------------------------------------------------------------------
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terminate(_Reason, State) ->
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ejabberd_router:unregister_route(State#state.host),
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ok.
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%%--------------------------------------------------------------------
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%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
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%% Description: Convert process state when code is changed
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%%--------------------------------------------------------------------
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%--------------------------------------------------------------------
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%% Example of routing XMPP packets using Erlang's message passing
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%%--------------------------------------------------------------------
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%% To enable this educational example, edit the function handle_info:
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%% replace the argument 'disabled' with 'enabled' in the call to the
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%% function do_client_version.
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%% ejabberd provides a method to receive XMPP packets using Erlang's
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%% message passing mechanism.
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%%
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%% The packets received by ejabberd are sent
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%% to the local destination process by sending an Erlang message.
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%% This means that you can receive XMPP stanzas in an Erlang process
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%% using Erlang's Receive, as long as this process is registered in
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%% ejabberd as the process which handles the destination JID.
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%%
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%% This example function is called when a client queries the echo service.
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%% This function then sends a query to the client, and waits 5 seconds to
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%% receive an answer. The answer will only be accepted if it was sent
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%% using exactly the same JID. We add a (mostly) random resource to
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%% try to guarantee that the received response matches the request sent.
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%% Finally, the received response is printed in the ejabberd log file.
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do_client_version(disabled, _From, _To) ->
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ok;
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do_client_version(enabled, From, To) ->
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ToS = jlib:jid_to_string(To),
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%% It is important to identify this process and packet
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Random_resource = integer_to_list(random:uniform(100000)),
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From2 = From#jid{resource = Random_resource,
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lresource = Random_resource},
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%% Build an iq:query request
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Packet = {xmlelement, "iq",
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[{"to", ToS}, {"type", "get"}],
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[{xmlelement, "query", [{"xmlns", ?NS_VERSION}], []}]},
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%% Send the request
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ejabberd_router:route(From2, To, Packet),
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%% Wait to receive the response
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%% It is very important to only accept a packet which is the
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%% response to the request that he sent
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Els = receive {route, To, From2, IQ} ->
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{xmlelement, "query", _, List} = xml:get_subtag(IQ, "query"),
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List
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after 5000 -> % Timeout in miliseconds: 5 seconds
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[]
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end,
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Values = [{Name, Value} || {xmlelement,Name,[],[{xmlcdata,Value}]} <- Els],
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%% Print in log
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Values_string1 = [io_lib:format("~n~s: ~p", [N, V]) || {N, V} <- Values],
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Values_string2 = lists:concat(Values_string1),
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?INFO_MSG("Information of the client: ~s~s", [ToS, Values_string2]).
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