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xmpp.chapril.org-ejabberd/src/mod_proxy65/mod_proxy65_service.erl

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%%%----------------------------------------------------------------------
%%% File : mod_proxy65_service.erl
%%% Author : Evgeniy Khramtsov <xram@jabber.ru>
%%% Purpose : SOCKS5 Bytestreams XMPP service.
%%% Created : 12 Oct 2006 by Evgeniy Khramtsov <xram@jabber.ru>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2011 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_proxy65_service).
-author('xram@jabber.ru').
-behaviour(gen_server).
%% gen_server callbacks.
-export([init/1,
handle_info/2,
handle_call/3,
handle_cast/2,
terminate/2,
code_change/3
]).
%% API.
-export([start_link/2, add_listener/2, delete_listener/1]).
-include_lib("exmpp/include/exmpp.hrl").
-include("ejabberd.hrl").
-define(PROCNAME, ejabberd_mod_proxy65_service).
-record(state, {
myhost,
serverhost,
name,
stream_addr,
port,
ip,
acl
}).
%%%------------------------
%%% gen_server callbacks
%%%------------------------
start_link(Host, Opts) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
gen_server:start_link({local, Proc}, ?MODULE, [Host, Opts], []).
init([Host, Opts]) ->
State = parse_options(Host, Opts),
ejabberd_router:register_route(State#state.myhost),
{ok, State}.
terminate(_Reason, #state{myhost=MyHost}) ->
ejabberd_router:unregister_route(MyHost),
ok.
handle_info({route, From, To, Packet}, State) when ?IS_IQ(Packet) ->
IQ_Rec = exmpp_iq:xmlel_to_iq(Packet),
case catch process_iq(From, IQ_Rec, State) of
Result when ?IS_IQ_RECORD(Result) ->
ejabberd_router:route(To, From,
exmpp_iq:iq_to_xmlel(Result, To, From));
{'EXIT', Reason} ->
?ERROR_MSG("Error when processing IQ stanza: ~p", [Reason]),
Err = exmpp_iq:error(Packet, 'internal-server-error'),
ejabberd_router:route(To, From, Err);
_ ->
ok
end,
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
handle_call(get_port_ip, _From, State) ->
{reply, {port_ip, State#state.port, State#state.ip}, State};
handle_call(_Request, _From, State) ->
{reply, ok, State}.
handle_cast(_Request, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%------------------------
%%% Listener management
%%%------------------------
add_listener(Host, Opts) ->
State = parse_options(Host, Opts),
NewOpts = [Host | Opts],
ejabberd_listener:add_listener({State#state.port, State#state.ip}, mod_proxy65_stream, NewOpts).
delete_listener(Host) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
{port_ip, Port, IP} = gen_server:call(Proc, get_port_ip),
catch ejabberd_listener:delete_listener({Port, IP}, mod_proxy65_stream).
%%%------------------------
%%% IQ Processing
%%%------------------------
%% disco#info request
process_iq(_, #iq{type = get, ns = ?NS_DISCO_INFO, lang = Lang} = IQ_Rec,
#state{name=Name, serverhost = ServerHost}) ->
ServerHostB = list_to_binary(ServerHost),
Info = ejabberd_hooks:run_fold(
disco_info, ServerHostB, [], [ServerHost, ?MODULE, <<>>, ""]),
Result = #xmlel{ns = ?NS_DISCO_INFO, name = 'query',
children = iq_disco_info(Lang, Name)++Info},
exmpp_iq:result(IQ_Rec, Result);
%% disco#items request
process_iq(_, #iq{type = get, ns = ?NS_DISCO_ITEMS} = IQ_Rec, _) ->
Result = #xmlel{ns = ?NS_DISCO_ITEMS, name = 'query',
children = []},
exmpp_iq:result(IQ_Rec, Result);
%% vCard request
process_iq(_, #iq{type = get, ns = ?NS_VCARD, lang = Lang} = IQ_Rec, _) ->
Result = #xmlel{ns = ?NS_VCARD, name = 'vCard',
children = iq_vcard(Lang)},
exmpp_iq:result(IQ_Rec, Result);
%% bytestreams info request
process_iq(JID, #iq{type = get, ns = ?NS_BYTESTREAMS} = IQ_Rec,
#state{acl = ACL, stream_addr = StreamAddr, serverhost = ServerHost}) ->
case acl:match_rule(ServerHost, ACL, JID) of
allow ->
StreamHostEl = [#xmlel{ns = ?NS_BYTESTREAMS, name = 'streamhost',
attrs = StreamAddr}],
Result = #xmlel{ns = ?NS_BYTESTREAMS, name = 'query',
children = StreamHostEl},
exmpp_iq:result(IQ_Rec, Result);
deny ->
exmpp_iq:error(IQ_Rec, 'forbidden')
end;
%% bytestream activation request
process_iq(InitiatorJID, #iq{type = set, payload = SubEl, ns = ?NS_BYTESTREAMS} = IQ_Rec,
#state{acl = ACL, serverhost = ServerHost}) ->
case acl:match_rule(ServerHost, ACL, InitiatorJID) of
allow ->
ActivateEl = exmpp_xml:get_path(SubEl, [{element, 'activate'}]),
SID = exmpp_xml:get_attribute_as_list(SubEl, <<"sid">>, ""),
case catch exmpp_jid:parse(exmpp_xml:get_cdata_as_list(ActivateEl)) of
TargetJID when ?IS_JID(TargetJID), SID /= "",
length(SID) =< 128, TargetJID /= InitiatorJID ->
Target = exmpp_jid:prep_to_list(TargetJID),
Initiator = exmpp_jid:prep_to_list(InitiatorJID),
SHA1 = sha:sha(SID ++ Initiator ++ Target),
case mod_proxy65_sm:activate_stream(SHA1, InitiatorJID, TargetJID, ServerHost) of
ok ->
exmpp_iq:result(IQ_Rec);
false ->
exmpp_iq:error(IQ_Rec, 'item-not-found');
limit ->
exmpp_iq:error(IQ_Rec, 'resource-constraint');
conflict ->
exmpp_iq:error(IQ_Rec, 'conflict');
_ ->
exmpp_iq:error(IQ_Rec, 'internal-server-error')
end;
_ ->
exmpp_iq:error(IQ_Rec, 'bad-request')
end;
deny ->
exmpp_iq:error(IQ_Rec, 'forbidden')
end;
%% Unknown "set" or "get" request
process_iq(_, #iq{kind=request} = IQ_Rec, _) ->
exmpp_iq:error(IQ_Rec, 'service-unavailable');
%% IQ "result" or "error".
process_iq(_, _, _) ->
ok.
%%%-------------------------
%%% Auxiliary functions.
%%%-------------------------
-define(FEATURE(Feat), #xmlel{ns = ?NS_DISCO_INFO, name = 'feature',
attrs = [?XMLATTR(<<"var">>, Feat)]}).
iq_disco_info(Lang, Name) ->
[#xmlel{ns = ?NS_DISCO_INFO, name = 'identity', attrs =
[?XMLATTR(<<"category">>, <<"proxy">>),
?XMLATTR(<<"type">>, <<"bytestreams">>),
?XMLATTR(<<"name">>, translate:translate(Lang, Name))]},
?FEATURE(?NS_DISCO_INFO_s),
?FEATURE(?NS_VCARD_s),
?FEATURE(?NS_BYTESTREAMS_s)].
iq_vcard(Lang) ->
[#xmlel{ns = ?NS_VCARD, name = 'FN', children =
[#xmlcdata{cdata = <<"ejabberd/mod_proxy65">>}]},
#xmlel{ns = ?NS_VCARD, name = 'URL', children =
[#xmlcdata{cdata = list_to_binary(?EJABBERD_URI)}]},
#xmlel{ns = ?NS_VCARD, name = 'DESC', children =
[#xmlcdata{cdata = list_to_binary(translate:translate(Lang, "ejabberd SOCKS5 Bytestreams module") ++
"\nCopyright (c) 2003-2011 ProcessOne")}]}].
parse_options(ServerHost, Opts) ->
MyHost = gen_mod:get_opt_host(ServerHost, Opts, "proxy.@HOST@"),
Port = gen_mod:get_opt(port, Opts, 7777),
ACL = gen_mod:get_opt(access, Opts, all),
Name = gen_mod:get_opt(name, Opts, "SOCKS5 Bytestreams"),
IP = case gen_mod:get_opt(ip, Opts, none) of
none -> get_my_ip();
Addr -> Addr
end,
HostName = case gen_mod:get_opt(hostname, Opts, none) of
none ->
inet_parse:ntoa(IP);
HostAddr when is_tuple(HostAddr) ->
inet_parse:ntoa(HostAddr);
HostNameStr ->
HostNameStr
end,
StreamAddr = [?XMLATTR(<<"jid">>, MyHost), ?XMLATTR(<<"host">>, HostName),
?XMLATTR(<<"port">>, Port)],
#state{myhost = MyHost,
serverhost = ServerHost,
name = Name,
port = Port,
ip = IP,
stream_addr = StreamAddr,
acl = ACL}.
get_my_ip() ->
{ok, MyHostName} = inet:gethostname(),
case inet:getaddr(MyHostName, inet) of
{ok, Addr} -> Addr;
{error, _} -> {127,0,0,1}
end.
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