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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_net).
-include("rabbit.hrl").
-export([is_ssl/1, ssl_info/1, controlling_process/2, getstat/2,
recv/1, sync_recv/2, async_recv/3, port_command/2, getopts/2,
setopts/2, send/2, close/1, fast_close/1, sockname/1, peername/1,
peercert/1, connection_string/2, socket_ends/2, is_loopback/1]).
%%---------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([socket/0]).
-type(stat_option() ::
'recv_cnt' | 'recv_max' | 'recv_avg' | 'recv_oct' | 'recv_dvi' |
'send_cnt' | 'send_max' | 'send_avg' | 'send_oct' | 'send_pend').
-type(ok_val_or_error(A) :: rabbit_types:ok_or_error2(A, any())).
-type(ok_or_any_error() :: rabbit_types:ok_or_error(any())).
-type(socket() :: port() | #ssl_socket{}).
-type(opts() :: [{atom(), any()} |
{raw, non_neg_integer(), non_neg_integer(), binary()}]).
-type(host_or_ip() :: binary() | inet:ip_address()).
-spec(is_ssl/1 :: (socket()) -> boolean()).
-spec(ssl_info/1 :: (socket())
-> 'nossl' | ok_val_or_error(
{atom(), {atom(), atom(), atom()}})).
-spec(controlling_process/2 :: (socket(), pid()) -> ok_or_any_error()).
-spec(getstat/2 ::
(socket(), [stat_option()])
-> ok_val_or_error([{stat_option(), integer()}])).
-spec(recv/1 :: (socket()) ->
{'data', [char()] | binary()} | 'closed' |
rabbit_types:error(any()) | {'other', any()}).
-spec(sync_recv/2 :: (socket(), integer()) -> rabbit_types:ok(binary()) |
rabbit_types:error(any())).
-spec(async_recv/3 ::
(socket(), integer(), timeout()) -> rabbit_types:ok(any())).
-spec(port_command/2 :: (socket(), iolist()) -> 'true').
-spec(getopts/2 :: (socket(), [atom() | {raw,
non_neg_integer(),
non_neg_integer(),
non_neg_integer() | binary()}])
-> ok_val_or_error(opts())).
-spec(setopts/2 :: (socket(), opts()) -> ok_or_any_error()).
-spec(send/2 :: (socket(), binary() | iolist()) -> ok_or_any_error()).
-spec(close/1 :: (socket()) -> ok_or_any_error()).
-spec(fast_close/1 :: (socket()) -> ok_or_any_error()).
-spec(sockname/1 ::
(socket())
-> ok_val_or_error({inet:ip_address(), rabbit_networking:ip_port()})).
-spec(peername/1 ::
(socket())
-> ok_val_or_error({inet:ip_address(), rabbit_networking:ip_port()})).
-spec(peercert/1 ::
(socket())
-> 'nossl' | ok_val_or_error(rabbit_ssl:certificate())).
-spec(connection_string/2 ::
(socket(), 'inbound' | 'outbound') -> ok_val_or_error(string())).
-spec(socket_ends/2 ::
(socket(), 'inbound' | 'outbound')
-> ok_val_or_error({host_or_ip(), rabbit_networking:ip_port(),
host_or_ip(), rabbit_networking:ip_port()})).
-spec(is_loopback/1 :: (socket() | inet:ip_address()) -> boolean()).
-endif.
%%---------------------------------------------------------------------------
-define(SSL_CLOSE_TIMEOUT, 5000).
-define(IS_SSL(Sock), is_record(Sock, ssl_socket)).
is_ssl(Sock) -> ?IS_SSL(Sock).
ssl_info(Sock) when ?IS_SSL(Sock) ->
ssl:connection_info(Sock#ssl_socket.ssl);
ssl_info(_Sock) ->
nossl.
controlling_process(Sock, Pid) when ?IS_SSL(Sock) ->
ssl:controlling_process(Sock#ssl_socket.ssl, Pid);
controlling_process(Sock, Pid) when is_port(Sock) ->
gen_tcp:controlling_process(Sock, Pid).
getstat(Sock, Stats) when ?IS_SSL(Sock) ->
inet:getstat(Sock#ssl_socket.tcp, Stats);
getstat(Sock, Stats) when is_port(Sock) ->
inet:getstat(Sock, Stats).
recv(Sock) when ?IS_SSL(Sock) ->
recv(Sock#ssl_socket.ssl, {ssl, ssl_closed, ssl_error});
recv(Sock) when is_port(Sock) ->
recv(Sock, {tcp, tcp_closed, tcp_error}).
recv(S, {DataTag, ClosedTag, ErrorTag}) ->
receive
{DataTag, S, Data} -> {data, Data};
{ClosedTag, S} -> closed;
{ErrorTag, S, Reason} -> {error, Reason};
Other -> {other, Other}
end.
sync_recv(Sock, Length) when ?IS_SSL(Sock) ->
ssl:recv(Sock#ssl_socket.ssl, Length);
sync_recv(Sock, Length) ->
gen_tcp:recv(Sock, Length).
async_recv(Sock, Length, Timeout) when ?IS_SSL(Sock) ->
Pid = self(),
Ref = make_ref(),
spawn(fun () -> Pid ! {inet_async, Sock, Ref,
ssl:recv(Sock#ssl_socket.ssl, Length, Timeout)}
end),
{ok, Ref};
async_recv(Sock, Length, infinity) when is_port(Sock) ->
prim_inet:async_recv(Sock, Length, -1);
async_recv(Sock, Length, Timeout) when is_port(Sock) ->
prim_inet:async_recv(Sock, Length, Timeout).
port_command(Sock, Data) when ?IS_SSL(Sock) ->
case ssl:send(Sock#ssl_socket.ssl, Data) of
ok -> self() ! {inet_reply, Sock, ok},
true;
{error, Reason} -> erlang:error(Reason)
end;
port_command(Sock, Data) when is_port(Sock) ->
erlang:port_command(Sock, Data).
getopts(Sock, Options) when ?IS_SSL(Sock) ->
ssl:getopts(Sock#ssl_socket.ssl, Options);
getopts(Sock, Options) when is_port(Sock) ->
inet:getopts(Sock, Options).
setopts(Sock, Options) when ?IS_SSL(Sock) ->
ssl:setopts(Sock#ssl_socket.ssl, Options);
setopts(Sock, Options) when is_port(Sock) ->
inet:setopts(Sock, Options).
send(Sock, Data) when ?IS_SSL(Sock) -> ssl:send(Sock#ssl_socket.ssl, Data);
send(Sock, Data) when is_port(Sock) -> gen_tcp:send(Sock, Data).
close(Sock) when ?IS_SSL(Sock) -> ssl:close(Sock#ssl_socket.ssl);
close(Sock) when is_port(Sock) -> gen_tcp:close(Sock).
fast_close(Sock) when ?IS_SSL(Sock) ->
%% We cannot simply port_close the underlying tcp socket since the
%% TLS protocol is quite insistent that a proper closing handshake
%% should take place (see RFC 5245 s7.2.1). So we call ssl:close
%% instead, but that can block for a very long time, e.g. when
%% there is lots of pending output and there is tcp backpressure,
%% or the ssl_connection process has entered the the
%% workaround_transport_delivery_problems function during
%% termination, which, inexplicably, does a gen_tcp:recv(Socket,
%% 0), which may never return if the client doesn't send a FIN or
%% that gets swallowed by the network. Since there is no timeout
%% variant of ssl:close, we construct our own.
{Pid, MRef} = spawn_monitor(fun () -> ssl:close(Sock#ssl_socket.ssl) end),
erlang:send_after(?SSL_CLOSE_TIMEOUT, self(), {Pid, ssl_close_timeout}),
receive
{Pid, ssl_close_timeout} ->
erlang:demonitor(MRef, [flush]),
exit(Pid, kill);
{'DOWN', MRef, process, Pid, _Reason} ->
ok
end,
catch port_close(Sock#ssl_socket.tcp),
ok;
fast_close(Sock) when is_port(Sock) ->
catch port_close(Sock), ok.
sockname(Sock) when ?IS_SSL(Sock) -> ssl:sockname(Sock#ssl_socket.ssl);
sockname(Sock) when is_port(Sock) -> inet:sockname(Sock).
peername(Sock) when ?IS_SSL(Sock) -> ssl:peername(Sock#ssl_socket.ssl);
peername(Sock) when is_port(Sock) -> inet:peername(Sock).
peercert(Sock) when ?IS_SSL(Sock) -> ssl:peercert(Sock#ssl_socket.ssl);
peercert(Sock) when is_port(Sock) -> nossl.
connection_string(Sock, Direction) ->
case socket_ends(Sock, Direction) of
{ok, {FromAddress, FromPort, ToAddress, ToPort}} ->
{ok, rabbit_misc:format(
"~s:~p -> ~s:~p",
[maybe_ntoab(FromAddress), FromPort,
maybe_ntoab(ToAddress), ToPort])};
Error ->
Error
end.
socket_ends(Sock, Direction) ->
{From, To} = sock_funs(Direction),
case {From(Sock), To(Sock)} of
{{ok, {FromAddress, FromPort}}, {ok, {ToAddress, ToPort}}} ->
{ok, {rdns(FromAddress), FromPort,
rdns(ToAddress), ToPort}};
{{error, _Reason} = Error, _} ->
Error;
{_, {error, _Reason} = Error} ->
Error
end.
maybe_ntoab(Addr) when is_tuple(Addr) -> rabbit_misc:ntoab(Addr);
maybe_ntoab(Host) -> Host.
rdns(Addr) ->
case application:get_env(rabbit, reverse_dns_lookups) of
{ok, true} -> list_to_binary(rabbit_networking:tcp_host(Addr));
_ -> Addr
end.
sock_funs(inbound) -> {fun peername/1, fun sockname/1};
sock_funs(outbound) -> {fun sockname/1, fun peername/1}.
is_loopback(Sock) when is_port(Sock) ; ?IS_SSL(Sock) ->
case sockname(Sock) of
{ok, {Addr, _Port}} -> is_loopback(Addr);
{error, _} -> false
end;
%% We could parse the results of inet:getifaddrs() instead. But that
%% would be more complex and less maybe Windows-compatible...
is_loopback({127,_,_,_}) -> true;
is_loopback({0,0,0,0,0,0,0,1}) -> true;
is_loopback({0,0,0,0,0,65535,AB,CD}) -> is_loopback(ipv4(AB, CD));
is_loopback(_) -> false.
ipv4(AB, CD) -> {AB bsr 8, AB band 255, CD bsr 8, CD band 255}.
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