%%%----------------------------------------------------------------------
%%% File : extauth.erl
%%% Author : Leif Johansson <leifj@it.su.se>
%%% Purpose : External authentication using a simple port-driver
%%% Created : 30 Jul 2004 by Leif Johansson <leifj@it.su.se>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2008 Process-one
%%%
%%% 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(extauth).
-author('leifj@it.su.se').
-export([start/2, stop/1, init/2,
check_password/3, set_password/3, is_user_exists/2]).
-include("ejabberd.hrl").
-define(CALL_TIMEOUT, 30000). % Timeout is in milliseconds: 30 seconds == 30000
start(Host, ExtPrg) ->
spawn(?MODULE, init, [Host, ExtPrg]).
init(Host, ExtPrg) ->
register(gen_mod:get_module_proc(Host, eauth), self()),
process_flag(trap_exit,true),
Port = open_port({spawn, ExtPrg}, [{packet,2}]),
loop(Port).
stop(Host) ->
gen_mod:get_module_proc(Host, eauth) ! stop.
check_password(User, Server, Password) ->
call_port(Server, ["auth", User, Server, Password]).
is_user_exists(User, Server) ->
call_port(Server, ["isuser", User, Server]).
set_password(User, Server, Password) ->
call_port(Server, ["setpass", User, Server, Password]).
call_port(Server, Msg) ->
LServer = jlib:nameprep(Server),
gen_mod:get_module_proc(LServer, eauth) ! {call, self(), Msg},
receive
{eauth,Result} ->
Result
end.
loop(Port) ->
receive
{call, Caller, Msg} ->
Port ! {self(), {command, encode(Msg)}},
receive
{Port, {data, Data}} ->
?DEBUG("extauth call '~p' received data response:~n~p", [Msg, Data]),
Caller ! {eauth, decode(Data)};
{Port, Other} ->
?ERROR_MSG("extauth call '~p' received strange response:~n~p", [Msg, Other])
after
?CALL_TIMEOUT ->
?ERROR_MSG("extauth call '~p' didn't receive response~n", [Msg])
end,
loop(Port);
stop ->
Port ! {self(), close},
receive
{Port, closed} ->
exit(normal)
end;
{'EXIT', Port, Reason} ->
?CRITICAL_MSG("~p ~n", [Reason]),
exit(port_terminated)
end.
join(List, Sep) ->
lists:foldl(fun(A, "") -> A;
(A, Acc) -> Acc ++ Sep ++ A
end, "", List).
encode(L) ->
join(L,":").
decode([0,0]) ->
false;
decode([0,1]) ->
true.
