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xmpp.chapril.org-ejabberd/src/ejabberd_s2s_out.erl

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%%%----------------------------------------------------------------------
%%% File : ejabberd_s2s_out.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose :
%%% Created : 6 Dec 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(ejabberd_s2s_out).
-author('alexey@sevcom.net').
-behaviour(gen_fsm).
%% External exports
-export([start/3,
start_link/3,
start_connection/1]).
%% gen_fsm callbacks
-export([init/1,
open_socket/2,
wait_for_stream/2,
wait_for_validation/2,
wait_for_features/2,
wait_for_auth_result/2,
wait_for_starttls_proceed/2,
reopen_socket/2,
stream_established/2,
handle_event/3,
handle_sync_event/4,
handle_info/3,
terminate/3,
code_change/4,
test_get_addr_port/1]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-record(state, {socket, receiver,
sockmod,
streamid,
use_v10,
tls = false,
tls_required = false,
tls_enabled = false,
tls_options = [],
authenticated = false,
db_enabled = true,
try_auth = true,
myname, server, queue,
new = false, verify = false,
timer}).
%-define(DBGFSM, true).
-ifdef(DBGFSM).
-define(FSMOPTS, [{debug, [trace]}]).
-else.
-define(FSMOPTS, []).
-endif.
-define(STREAM_HEADER,
"<?xml version='1.0'?>"
"<stream:stream "
"xmlns:stream='http://etherx.jabber.org/streams' "
"xmlns='jabber:server' "
"xmlns:db='jabber:server:dialback' "
"to='~s'~s>"
).
-define(STREAM_TRAILER, "</stream:stream>").
-define(INVALID_NAMESPACE_ERR,
xml:element_to_string(?SERR_INVALID_NAMESPACE)).
-define(HOST_UNKNOWN_ERR,
xml:element_to_string(?SERR_HOST_UNKNOWN)).
-define(INVALID_XML_ERR,
xml:element_to_string(?SERR_XML_NOT_WELL_FORMED)).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(From, Host, Type) ->
supervisor:start_child(ejabberd_s2s_out_sup, [From, Host, Type]).
start_link(From, Host, Type) ->
gen_fsm:start_link(ejabberd_s2s_out, [From, Host, Type], ?FSMOPTS).
start_connection(Pid) ->
gen_fsm:send_event(Pid, init).
%%%----------------------------------------------------------------------
%%% Callback functions from gen_fsm
%%%----------------------------------------------------------------------
%%----------------------------------------------------------------------
%% Func: init/1
%% Returns: {ok, StateName, StateData} |
%% {ok, StateName, StateData, Timeout} |
%% ignore |
%% {stop, StopReason}
%%----------------------------------------------------------------------
init([From, Server, Type]) ->
?INFO_MSG("started: ~p", [{From, Server, Type}]),
TLS = case ejabberd_config:get_local_option(s2s_use_starttls) of
undefined ->
false;
UseStartTLS ->
UseStartTLS
end,
UseV10 = TLS,
TLSOpts = case ejabberd_config:get_local_option(s2s_certfile) of
undefined ->
[];
CertFile ->
[{certfile, CertFile}, connect]
end,
{New, Verify} = case Type of
{new, Key} ->
{Key, false};
{verify, Pid, Key, SID} ->
start_connection(self()),
{false, {Pid, Key, SID}}
end,
Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
{ok, open_socket, #state{use_v10 = UseV10,
tls = TLS,
tls_options = TLSOpts,
queue = queue:new(),
myname = From,
server = Server,
new = New,
verify = Verify,
timer = Timer}}.
%%----------------------------------------------------------------------
%% Func: StateName/2
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
open_socket(init, StateData) ->
AddrList = get_addr_port(StateData#state.server),
case lists:foldl(fun({Addr, Port}, Acc) ->
case Acc of
{ok, Socket} ->
{ok, Socket};
_ ->
open_socket1(Addr, Port)
end
end, {error, badarg}, AddrList) of
{ok, Socket} ->
ReceiverPid = ejabberd_receiver:start(Socket, gen_tcp, none),
ok = gen_tcp:controlling_process(Socket, ReceiverPid),
ejabberd_receiver:become_controller(ReceiverPid),
Version = if
StateData#state.use_v10 ->
" version='1.0'";
true ->
""
end,
NewStateData = StateData#state{socket = Socket,
sockmod = gen_tcp,
tls_enabled = false,
receiver = ReceiverPid,
streamid = new_id()},
send_text(NewStateData, io_lib:format(?STREAM_HEADER,
[StateData#state.server,
Version])),
{next_state, wait_for_stream, NewStateData};
{error, _Reason} ->
Error = ?ERR_REMOTE_SERVER_NOT_FOUND,
bounce_messages(Error),
{stop, normal, StateData}
end;
open_socket(_, StateData) ->
{next_state, open_socket, StateData}.
%%----------------------------------------------------------------------
open_socket1(Addr, Port) ->
Res = case idna:domain_utf8_to_ascii(Addr) of
false -> {error, badarg};
ASCIIAddr ->
?DEBUG("s2s_out: connecting to ~s:~p~n", [ASCIIAddr, Port]),
case catch gen_tcp:connect(ASCIIAddr, Port,
[binary, {packet, 0},
{active, false}]) of
{ok, _Socket} = R -> R;
{error, Reason1} ->
?DEBUG("s2s_out: connect return ~p~n", [Reason1]),
catch gen_tcp:connect(Addr, Port,
[binary, {packet, 0},
{active, false}, inet6]);
{'EXIT', Reason1} ->
?DEBUG("s2s_out: connect crashed ~p~n", [Reason1]),
catch gen_tcp:connect(Addr, Port,
[binary, {packet, 0},
{active, false}, inet6])
end
end,
case Res of
{ok, Socket} ->
{ok, Socket};
{error, Reason} ->
?DEBUG("s2s_out: inet6 connect return ~p~n", [Reason]),
{error, Reason};
{'EXIT', Reason} ->
?DEBUG("s2s_out: inet6 connect crashed ~p~n", [Reason]),
{error, Reason}
end.
%%----------------------------------------------------------------------
wait_for_stream({xmlstreamstart, Name, Attrs}, StateData) ->
case {xml:get_attr_s("xmlns", Attrs),
xml:get_attr_s("xmlns:db", Attrs),
xml:get_attr_s("version", Attrs) == "1.0"} of
{"jabber:server", "jabber:server:dialback", false} ->
send_db_request(StateData);
{"jabber:server", "jabber:server:dialback", true} when
StateData#state.use_v10 ->
{next_state, wait_for_features, StateData};
{"jabber:server", "", true} when StateData#state.use_v10 ->
{next_state, wait_for_features, StateData#state{db_enabled = false}};
_ ->
send_text(StateData, ?INVALID_NAMESPACE_ERR),
{stop, normal, StateData}
end;
wait_for_stream({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
wait_for_stream(timeout, StateData) ->
{stop, normal, StateData};
wait_for_stream(closed, StateData) ->
{stop, normal, StateData}.
wait_for_validation({xmlstreamelement, El}, StateData) ->
case is_verify_res(El) of
{result, To, From, Id, Type} ->
?INFO_MSG("recv result: ~p", [{From, To, Id, Type}]),
case Type of
"valid" ->
send_queue(StateData, StateData#state.queue),
{next_state, stream_established,
StateData#state{queue = queue:new()}};
_ ->
% TODO: bounce packets
{stop, normal, StateData}
end;
{verify, To, From, Id, Type} ->
?INFO_MSG("recv verify: ~p", [{From, To, Id, Type}]),
case StateData#state.verify of
false ->
{next_state, wait_for_validation, StateData};
{Pid, _Key, _SID} ->
case Type of
"valid" ->
gen_fsm:send_event(
Pid, {valid,
StateData#state.server,
StateData#state.myname});
_ ->
gen_fsm:send_event(
Pid, {invalid,
StateData#state.server,
StateData#state.myname})
end,
if
StateData#state.verify == false ->
{stop, normal, StateData};
true ->
{next_state, wait_for_validation, StateData}
end
end;
_ ->
{next_state, wait_for_validation, StateData}
end;
wait_for_validation({xmlstreamend, Name}, StateData) ->
{stop, normal, StateData};
wait_for_validation({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
wait_for_validation(timeout, StateData) ->
{stop, normal, StateData};
wait_for_validation(closed, StateData) ->
{stop, normal, StateData}.
wait_for_features({xmlstreamelement, El}, StateData) ->
case El of
{xmlelement, "stream:features", _Attrs, Els} ->
{SASLEXT, StartTLS, StartTLSRequired} =
lists:foldl(
fun({xmlelement, "mechanisms", Attrs1, Els1} = El1,
{SEXT, STLS, STLSReq} = Acc) ->
case xml:get_attr_s("xmlns", Attrs1) of
?NS_SASL ->
NewSEXT =
lists:any(
fun({xmlelement, "mechanism", _, Els2}) ->
case xml:get_cdata(Els2) of
"EXTERNAL" -> true;
_ -> false
end;
(_) -> false
end, Els1),
{NewSEXT, STLS, STLSReq};
_ ->
Acc
end;
({xmlelement, "starttls", Attrs1, Els1} = El1,
{SEXT, STLS, STLSReq} = Acc) ->
case xml:get_attr_s("xmlns", Attrs1) of
?NS_TLS ->
Req = case xml:get_subtag(El1, "required") of
{xmlelement, _, _, _} -> true;
false -> false
end,
{SEXT, true, Req};
_ ->
Acc
end;
(_, Acc) ->
Acc
end, {false, false, false}, Els),
if
(not SASLEXT) and (not StartTLS) and
StateData#state.authenticated ->
send_queue(StateData, StateData#state.queue),
{next_state, stream_established,
StateData#state{queue = queue:new()}};
SASLEXT and StateData#state.try_auth and
(StateData#state.new /= false) ->
send_element(StateData,
{xmlelement, "auth",
[{"xmlns", ?NS_SASL},
{"mechanism", "EXTERNAL"}],
[{xmlcdata,
jlib:encode_base64(
StateData#state.myname)}]}),
{next_state, wait_for_auth_result,
StateData#state{try_auth = false}};
StartTLS and StateData#state.tls and
(not StateData#state.tls_enabled) ->
send_element(StateData,
{xmlelement, "starttls",
[{"xmlns", ?NS_TLS}], []}),
{next_state, wait_for_starttls_proceed, StateData};
StartTLSRequired and (not StateData#state.tls) ->
?INFO_MSG("restarted: ~p", [{StateData#state.myname,
StateData#state.server}]),
ejabberd_receiver:close(StateData#state.receiver),
{next_state, reopen_socket,
StateData#state{socket = undefined,
use_v10 = false}};
StateData#state.db_enabled ->
send_db_request(StateData);
true ->
?INFO_MSG("restarted: ~p", [{StateData#state.myname,
StateData#state.server}]),
% TODO: clear message queue
ejabberd_receiver:close(StateData#state.receiver),
{next_state, reopen_socket, StateData#state{socket = undefined,
use_v10 = false}}
end;
_ ->
send_text(StateData,
xml:element_to_string(?SERR_BAD_FORMAT) ++
?STREAM_TRAILER),
{stop, normal, StateData}
end;
wait_for_features({xmlstreamend, Name}, StateData) ->
{stop, normal, StateData};
wait_for_features({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
wait_for_features(timeout, StateData) ->
{stop, normal, StateData};
wait_for_features(closed, StateData) ->
{stop, normal, StateData}.
wait_for_auth_result({xmlstreamelement, El}, StateData) ->
case El of
{xmlelement, "success", Attrs, _Els} ->
case xml:get_attr_s("xmlns", Attrs) of
?NS_SASL ->
?INFO_MSG("auth: ~p", [{StateData#state.myname,
StateData#state.server}]),
ejabberd_receiver:reset_stream(
StateData#state.receiver),
send_text(StateData,
io_lib:format(?STREAM_HEADER,
[StateData#state.server,
" version='1.0'"])),
{next_state, wait_for_stream,
StateData#state{streamid = new_id(),
authenticated = true
}};
_ ->
send_text(StateData,
xml:element_to_string(?SERR_BAD_FORMAT) ++
?STREAM_TRAILER),
{stop, normal, StateData}
end;
{xmlelement, "failure", Attrs, _Els} ->
case xml:get_attr_s("xmlns", Attrs) of
?NS_SASL ->
?INFO_MSG("restarted: ~p", [{StateData#state.myname,
StateData#state.server}]),
ejabberd_receiver:close(StateData#state.receiver),
{next_state, reopen_socket,
StateData#state{socket = undefined}};
_ ->
send_text(StateData,
xml:element_to_string(?SERR_BAD_FORMAT) ++
?STREAM_TRAILER),
{stop, normal, StateData}
end;
_ ->
send_text(StateData,
xml:element_to_string(?SERR_BAD_FORMAT) ++
?STREAM_TRAILER),
{stop, normal, StateData}
end;
wait_for_auth_result({xmlstreamend, Name}, StateData) ->
{stop, normal, StateData};
wait_for_auth_result({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
wait_for_auth_result(timeout, StateData) ->
{stop, normal, StateData};
wait_for_auth_result(closed, StateData) ->
{stop, normal, StateData}.
wait_for_starttls_proceed({xmlstreamelement, El}, StateData) ->
case El of
{xmlelement, "proceed", Attrs, _Els} ->
case xml:get_attr_s("xmlns", Attrs) of
?NS_TLS ->
?INFO_MSG("starttls: ~p", [{StateData#state.myname,
StateData#state.server}]),
Socket = StateData#state.socket,
TLSOpts = case ejabberd_config:get_local_option(
{domain_certfile,
StateData#state.server}) of
undefined ->
StateData#state.tls_options;
CertFile ->
[{certfile, CertFile} |
lists:keydelete(
certfile, 1,
StateData#state.tls_options)]
end,
{ok, TLSSocket} = tls:tcp_to_tls(Socket, TLSOpts),
ejabberd_receiver:starttls(
StateData#state.receiver, TLSSocket),
NewStateData = StateData#state{sockmod = tls,
socket = TLSSocket,
streamid = new_id(),
tls_enabled = true
},
send_text(NewStateData,
io_lib:format(?STREAM_HEADER,
[StateData#state.server,
" version='1.0'"])),
{next_state, wait_for_stream, NewStateData};
_ ->
send_text(StateData,
xml:element_to_string(?SERR_BAD_FORMAT) ++
?STREAM_TRAILER),
{stop, normal, StateData}
end;
_ ->
{stop, normal, StateData}
end;
wait_for_starttls_proceed({xmlstreamend, Name}, StateData) ->
{stop, normal, StateData};
wait_for_starttls_proceed({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
wait_for_starttls_proceed(timeout, StateData) ->
{stop, normal, StateData};
wait_for_starttls_proceed(closed, StateData) ->
{stop, normal, StateData}.
reopen_socket({xmlstreamelement, El}, StateData) ->
{next_state, reopen_socket, StateData};
reopen_socket({xmlstreamend, Name}, StateData) ->
{next_state, reopen_socket, StateData};
reopen_socket({xmlstreamerror, _}, StateData) ->
{next_state, reopen_socket, StateData};
reopen_socket(timeout, StateData) ->
{stop, normal, StateData};
reopen_socket(closed, StateData) ->
gen_fsm:send_event(self(), init),
{next_state, open_socket, StateData}.
stream_established({xmlstreamelement, El}, StateData) ->
?INFO_MSG("stream established", []),
case is_verify_res(El) of
{verify, VTo, VFrom, VId, VType} ->
?INFO_MSG("recv verify: ~p", [{VFrom, VTo, VId, VType}]),
case StateData#state.verify of
{VPid, _VKey, _SID} ->
case VType of
"valid" ->
gen_fsm:send_event(
VPid, {valid,
StateData#state.server,
StateData#state.myname});
_ ->
gen_fsm:send_event(
VPid, {invalid,
StateData#state.server,
StateData#state.myname})
end;
_ ->
ok
end;
_ ->
ok
end,
{next_state, stream_established, StateData};
stream_established({xmlstreamend, Name}, StateData) ->
{stop, normal, StateData};
stream_established({xmlstreamerror, _}, StateData) ->
send_text(StateData,
?INVALID_XML_ERR ++ ?STREAM_TRAILER),
{stop, normal, StateData};
stream_established(timeout, StateData) ->
{stop, normal, StateData};
stream_established(closed, StateData) ->
{stop, normal, StateData}.
%%----------------------------------------------------------------------
%% Func: StateName/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
%state_name(Event, From, StateData) ->
% Reply = ok,
% {reply, Reply, state_name, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_event/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_event(Event, StateName, StateData) ->
{next_state, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_sync_event/4
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {reply, Reply, NextStateName, NextStateData} |
%% {reply, Reply, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData} |
%% {stop, Reason, Reply, NewStateData}
%%----------------------------------------------------------------------
handle_sync_event(Event, From, StateName, StateData) ->
Reply = ok,
{reply, Reply, StateName, StateData}.
code_change(OldVsn, StateName, StateData, Extra) ->
{ok, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: handle_info/3
%% Returns: {next_state, NextStateName, NextStateData} |
%% {next_state, NextStateName, NextStateData, Timeout} |
%% {stop, Reason, NewStateData}
%%----------------------------------------------------------------------
handle_info({send_text, Text}, StateName, StateData) ->
send_text(StateData, Text),
cancel_timer(StateData#state.timer),
Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
{next_state, StateName, StateData#state{timer = Timer}};
handle_info({send_element, El}, StateName, StateData) ->
cancel_timer(StateData#state.timer),
Timer = erlang:start_timer(?S2STIMEOUT, self(), []),
case StateName of
stream_established ->
send_element(StateData, El),
{next_state, StateName, StateData#state{timer = Timer}};
_ ->
Q = queue:in(El, StateData#state.queue),
{next_state, StateName, StateData#state{queue = Q,
timer = Timer}}
end;
%handle_info({tcp, Socket, Data}, StateName, StateData) ->
% xml_stream:send_text(StateData#state.xmlpid, Data),
% {next_state, StateName, StateData};
%
%handle_info({tcp_closed, Socket}, StateName, StateData) ->
% gen_fsm:send_event(self(), closed),
% {next_state, StateName, StateData};
%
%handle_info({tcp_error, Socket, Reason}, StateName, StateData) ->
% gen_fsm:send_event(self(), closed),
% {next_state, StateName, StateData};
handle_info({timeout, Timer, _}, StateName,
#state{timer = Timer} = StateData) ->
{stop, normal, StateData};
handle_info(_, StateName, StateData) ->
{next_state, StateName, StateData}.
%%----------------------------------------------------------------------
%% Func: terminate/3
%% Purpose: Shutdown the fsm
%% Returns: any
%%----------------------------------------------------------------------
terminate(Reason, StateName, StateData) ->
?INFO_MSG("terminated: ~p", [Reason]),
bounce_queue(StateData#state.queue, ?ERR_REMOTE_SERVER_NOT_FOUND),
case StateData#state.new of
false ->
ok;
Key ->
ejabberd_s2s:remove_connection({StateData#state.myname,
StateData#state.server})
end,
case StateData#state.socket of
undefined ->
ok;
_Socket ->
ejabberd_receiver:close(StateData#state.receiver)
end,
ok.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
send_text(StateData, Text) ->
(StateData#state.sockmod):send(StateData#state.socket, Text).
send_element(StateData, El) ->
send_text(StateData, xml:element_to_string(El)).
send_queue(StateData, Q) ->
case queue:out(Q) of
{{value, El}, Q1} ->
send_element(StateData, El),
send_queue(StateData, Q1);
{empty, Q1} ->
ok
end.
bounce_queue(Q, Error) ->
case queue:out(Q) of
{{value, El}, Q1} ->
Err = jlib:make_error_reply(El, Error),
From = jlib:string_to_jid(xml:get_tag_attr_s("from", El)),
To = jlib:string_to_jid(xml:get_tag_attr_s("to", El)),
ejabberd_router:route(To, From, Err),
bounce_queue(Q1, Error);
{empty, Q1} ->
ok
end.
new_id() ->
randoms:get_string().
cancel_timer(Timer) ->
erlang:cancel_timer(Timer),
receive
{timeout, Timer, _} ->
ok
after 0 ->
ok
end.
bounce_messages(Error) ->
receive
{send_element, El} ->
{xmlelement, _Name, Attrs, _SubTags} = El,
case xml:get_attr_s("type", Attrs) of
"error" ->
ok;
_ ->
Err = jlib:make_error_reply(El, Error),
From = jlib:string_to_jid(xml:get_attr_s("from", Attrs)),
To = jlib:string_to_jid(xml:get_attr_s("to", Attrs)),
ejabberd_router:route(To, From, Err)
end,
bounce_messages(Error)
after 0 ->
ok
end.
send_db_request(StateData) ->
Server = StateData#state.server,
New = case StateData#state.new of
false ->
case ejabberd_s2s:try_register(
{StateData#state.myname, Server}) of
{key, Key} ->
Key;
false ->
false
end;
Key ->
Key
end,
case New of
false ->
ok;
Key1 ->
send_element(StateData,
{xmlelement,
"db:result",
[{"from", StateData#state.myname},
{"to", Server}],
[{xmlcdata, Key1}]})
end,
case StateData#state.verify of
false ->
ok;
{Pid, Key2, SID} ->
send_element(StateData,
{xmlelement,
"db:verify",
[{"from", StateData#state.myname},
{"to", StateData#state.server},
{"id", SID}],
[{xmlcdata, Key2}]})
end,
{next_state, wait_for_validation, StateData#state{new = New}}.
is_verify_res({xmlelement, Name, Attrs, Els}) when Name == "db:result" ->
{result,
xml:get_attr_s("to", Attrs),
xml:get_attr_s("from", Attrs),
xml:get_attr_s("id", Attrs),
xml:get_attr_s("type", Attrs)};
is_verify_res({xmlelement, Name, Attrs, Els}) when Name == "db:verify" ->
{verify,
xml:get_attr_s("to", Attrs),
xml:get_attr_s("from", Attrs),
xml:get_attr_s("id", Attrs),
xml:get_attr_s("type", Attrs)};
is_verify_res(_) ->
false.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% SRV support
-include_lib("kernel/include/inet.hrl").
get_addr_port(Server) ->
Res = case inet_res:getbyname("_xmpp-server._tcp." ++ Server, srv) of
{error, _Reason} ->
inet_res:getbyname("_jabber._tcp." ++ Server, srv);
{ok, _HEnt} = R -> R
end,
case Res of
{error, Reason} ->
?DEBUG("srv lookup of '~s' failed: ~p~n", [Server, Reason]),
[{Server, ejabberd_config:get_local_option(outgoing_s2s_port)}];
{ok, HEnt} ->
?DEBUG("srv lookup of '~s': ~p~n",
[Server, HEnt#hostent.h_addr_list]),
case HEnt#hostent.h_addr_list of
[] ->
[{Server,
ejabberd_config:get_local_option(outgoing_s2s_port)}];
AddrList ->
% Probabilities are not exactly proportional to weights
% for simplicity (higher weigths are overvalued)
{A1, A2, A3} = now(),
random:seed(A1, A2, A3),
case (catch lists:map(
fun({Priority, Weight, Port, Host}) ->
N = case Weight of
0 -> 0;
_ -> (Weight + 1) * random:uniform()
end,
{Priority * 65536 - N, Host, Port}
end, AddrList)) of
{'EXIT', _Reasn} ->
[{Server,
ejabberd_config:get_local_option(outgoing_s2s_port)}];
SortedList ->
List = lists:map(
fun({_, Host, Port}) ->
{Host, Port}
end, lists:keysort(1, SortedList)),
?DEBUG("srv lookup of '~s': ~p~n", [Server, List]),
List
end
end
end.
test_get_addr_port(Server) ->
lists:foldl(
fun(_, Acc) ->
[HostPort | _] = get_addr_port(Server),
case lists:keysearch(HostPort, 1, Acc) of
false ->
[{HostPort, 1} | Acc];
{value, {_, Num}} ->
lists:keyreplace(HostPort, 1, Acc, {HostPort, Num + 1})
end
end, [], lists:seq(1, 100000)).
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