%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2000-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
%%
-module(inet_ssl_dist).
%% Handles the connection setup phase with other Erlang nodes.
-export([childspecs/0, listen/1, accept/1, accept_connection/5,
setup/5, close/1, select/1, is_node_name/1]).
%% internal exports
-export([accept_loop/2,do_accept/6,do_setup/6, getstat/1,tick/1]).
-import(error_logger,[error_msg/2]).
-include("net_address.hrl").
-define(to_port(Socket, Data, Opts),
case ssl_prim:send(Socket, Data, Opts) of
{error, closed} ->
self() ! {ssl_closed, Socket},
{error, closed};
R ->
R
end).
-include("dist.hrl").
-include("dist_util.hrl").
%% -------------------------------------------------------------
%% This function should return a valid childspec, so that
%% the primitive ssl_server gets supervised
%% -------------------------------------------------------------
childspecs() ->
{ok, [{ssl_server_prim,{ssl_server, start_link_prim, []},
permanent, 2000, worker, [ssl_server]}]}.
%% ------------------------------------------------------------
%% Select this protocol based on node name
%% select(Node) => Bool
%% ------------------------------------------------------------
select(Node) ->
case split_node(atom_to_list(Node), $@, []) of
[_,_Host] -> true;
_ -> false
end.
%% ------------------------------------------------------------
%% Create the listen socket, i.e. the port that this erlang
%% node is accessible through.
%% ------------------------------------------------------------
listen(Name) ->
case ssl_prim:listen(0, [{active, false}, {packet,4}] ++
get_ssl_options(server)) of
{ok, Socket} ->
TcpAddress = get_tcp_address(Socket),
{_,Port} = TcpAddress#net_address.address,
{ok, Creation} = erl_epmd:register_node(Name, Port),
{ok, {Socket, TcpAddress, Creation}};
Error ->
Error
end.
%% ------------------------------------------------------------
%% Accepts new connection attempts from other Erlang nodes.
%% ------------------------------------------------------------
accept(Listen) ->
spawn_link(?MODULE, accept_loop, [self(), Listen]).
accept_loop(Kernel, Listen) ->
process_flag(priority, max),
case ssl_prim:accept(Listen) of
{ok, Socket} ->
Kernel ! {accept,self(),Socket,inet,ssl},
controller(Kernel, Socket),
accept_loop(Kernel, Listen);
Error ->
exit(Error)
end.
controller(Kernel, Socket) ->
receive
{Kernel, controller, Pid} ->
flush_controller(Pid, Socket),
ssl_prim:controlling_process(Socket, Pid),
flush_controller(Pid, Socket),
Pid ! {self(), controller};
{Kernel, unsupported_protocol} ->
exit(unsupported_protocol)
end.
flush_controller(Pid, Socket) ->
receive
{ssl, Socket, Data} ->
Pid ! {ssl, Socket, Data},
flush_controller(Pid, Socket);
{ssl_closed, Socket} ->
Pid ! {ssl_closed, Socket},
flush_controller(Pid, Socket)
after 0 ->
ok
end.
%% ------------------------------------------------------------
%% Accepts a new connection attempt from another Erlang node.
%% Performs the handshake with the other side.
%% ------------------------------------------------------------
accept_connection(AcceptPid, Socket, MyNode, Allowed, SetupTime) ->
spawn_link(?MODULE, do_accept,
[self(), AcceptPid, Socket, MyNode,
Allowed, SetupTime]).
%% Suppress dialyzer warning, we do not really care about old ssl code
%% as we intend to remove it.
-spec(do_accept(_,_,_,_,_,_) -> no_return()).
do_accept(Kernel, AcceptPid, Socket, MyNode, Allowed, SetupTime) ->
process_flag(priority, max),
receive
{AcceptPid, controller} ->
Timer = dist_util:start_timer(SetupTime),
case check_ip(Socket) of
true ->
HSData = #hs_data{
kernel_pid = Kernel,
this_node = MyNode,
socket = Socket,
timer = Timer,
this_flags = 0,
allowed = Allowed,
f_send = fun(S,D) -> ssl_prim:send(S,D) end,
f_recv = fun(S,N,T) -> ssl_prim:recv(S,N,T)
end,
f_setopts_pre_nodeup =
fun(S) ->
ssl_prim:setopts(S,
[{active, false}])
end,
f_setopts_post_nodeup =
fun(S) ->
ssl_prim:setopts(S,
[{deliver, port},
{active, true}])
end,
f_getll = fun(S) ->
ssl_prim:getll(S)
end,
f_address = fun get_remote_id/2,
mf_tick = fun ?MODULE:tick/1,
mf_getstat = fun ?MODULE:getstat/1
},
dist_util:handshake_other_started(HSData);
{false,IP} ->
error_msg("** Connection attempt from "
"disallowed IP ~w ** ~n", [IP]),
?shutdown(no_node)
end
end.
%% ------------------------------------------------------------
%% Get remote information about a Socket.
%% ------------------------------------------------------------
get_remote_id(Socket, Node) ->
{ok, Address} = ssl_prim:peername(Socket),
[_, Host] = split_node(atom_to_list(Node), $@, []),
#net_address {
address = Address,
host = Host,
protocol = ssl,
family = inet }.
%% ------------------------------------------------------------
%% Setup a new connection to another Erlang node.
%% Performs the handshake with the other side.
%% ------------------------------------------------------------
setup(Node, Type, MyNode, LongOrShortNames,SetupTime) ->
spawn_link(?MODULE, do_setup, [self(),
Node,
Type,
MyNode,
LongOrShortNames,
SetupTime]).
%% Suppress dialyzer warning, we do not really care about old ssl code
%% as we intend to remove it.
-spec(do_setup(_,_,_,_,_,_) -> no_return()).
do_setup(Kernel, Node, Type, MyNode, LongOrShortNames,SetupTime) ->
process_flag(priority, max),
?trace("~p~n",[{inet_ssl_dist,self(),setup,Node}]),
[Name, Address] = splitnode(Node, LongOrShortNames),
case inet:getaddr(Address, inet) of
{ok, Ip} ->
Timer = dist_util:start_timer(SetupTime),
case erl_epmd:port_please(Name, Ip) of
{port, TcpPort, Version} ->
?trace("port_please(~p) -> version ~p~n",
[Node,Version]),
dist_util:reset_timer(Timer),
case ssl_prim:connect(Ip, TcpPort,
[{active, false},
{packet,4}] ++
get_ssl_options(client)) of
{ok, Socket} ->
HSData = #hs_data{
kernel_pid = Kernel,
other_node = Node,
this_node = MyNode,
socket = Socket,
timer = Timer,
this_flags = 0,
other_version = Version,
f_send = fun(S,D) ->
ssl_prim:send(S,D)
end,
f_recv = fun(S,N,T) ->
ssl_prim:recv(S,N,T)
end,
f_setopts_pre_nodeup =
fun(S) ->
ssl_prim:setopts
(S,
[{active, false}])
end,
f_setopts_post_nodeup =
fun(S) ->
ssl_prim:setopts
(S,
[{deliver, port},{active, true}])
end,
f_getll = fun(S) ->
ssl_prim:getll(S)
end,
f_address =
fun(_,_) ->
#net_address {
address = {Ip,TcpPort},
host = Address,
protocol = ssl,
family = inet}
end,
mf_tick = fun ?MODULE:tick/1,
mf_getstat = fun ?MODULE:getstat/1,
request_type = Type
},
dist_util:handshake_we_started(HSData);
_ ->
%% Other Node may have closed since
%% port_please !
?trace("other node (~p) "
"closed since port_please.~n",
[Node]),
?shutdown(Node)
end;
_ ->
?trace("port_please (~p) "
"failed.~n", [Node]),
?shutdown(Node)
end;
_Other ->
?trace("inet_getaddr(~p) "
"failed (~p).~n", [Node,Other]),
?shutdown(Node)
end.
%%
%% Close a socket.
%%
close(Socket) ->
ssl_prim:close(Socket).
%% If Node is illegal terminate the connection setup!!
splitnode(Node, LongOrShortNames) ->
case split_node(atom_to_list(Node), $@, []) of
[Name|Tail] when Tail =/= [] ->
Host = lists:append(Tail),
case split_node(Host, $., []) of
[_] when LongOrShortNames == longnames ->
error_msg("** System running to use "
"fully qualified "
"hostnames **~n"
"** Hostname ~s is illegal **~n",
[Host]),
?shutdown(Node);
[_, _ | _] when LongOrShortNames == shortnames ->
error_msg("** System NOT running to use fully qualified "
"hostnames **~n"
"** Hostname ~s is illegal **~n",
[Host]),
?shutdown(Node);
_ ->
[Name, Host]
end;
[_] ->
error_msg("** Nodename ~p illegal, no '@' character **~n",
[Node]),
?shutdown(Node);
_ ->
error_msg("** Nodename ~p illegal **~n", [Node]),
?shutdown(Node)
end.
split_node([Chr|T], Chr, Ack) -> [lists:reverse(Ack)|split_node(T, Chr, [])];
split_node([H|T], Chr, Ack) -> split_node(T, Chr, [H|Ack]);
split_node([], _, Ack) -> [lists:reverse(Ack)].
%% ------------------------------------------------------------
%% Fetch local information about a Socket.
%% ------------------------------------------------------------
get_tcp_address(Socket) ->
{ok, Address} = ssl_prim:sockname(Socket),
{ok, Host} = inet:gethostname(),
#net_address {
address = Address,
host = Host,
protocol = ssl,
family = inet
}.
%% ------------------------------------------------------------
%% Do only accept new connection attempts from nodes at our
%% own LAN, if the check_ip environment parameter is true.
%% ------------------------------------------------------------
check_ip(Socket) ->
case application:get_env(check_ip) of
{ok, true} ->
case get_ifs(Socket) of
{ok, IFs, IP} ->
check_ip(IFs, IP);
_ ->
?shutdown(no_node)
end;
_ ->
true
end.
get_ifs(Socket) ->
case ssl_prim:peername(Socket) of
{ok, {IP, _}} ->
case ssl_prim:getif(Socket) of
{ok, IFs} -> {ok, IFs, IP};
Error -> Error
end;
Error ->
Error
end.
check_ip([{OwnIP, _, Netmask}|IFs], PeerIP) ->
case {mask(Netmask, PeerIP), mask(Netmask, OwnIP)} of
{M, M} -> true;
_ -> check_ip(IFs, PeerIP)
end;
check_ip([], PeerIP) ->
{false, PeerIP}.
mask({M1,M2,M3,M4}, {IP1,IP2,IP3,IP4}) ->
{M1 band IP1,
M2 band IP2,
M3 band IP3,
M4 band IP4}.
is_node_name(Node) when is_atom(Node) ->
case split_node(atom_to_list(Node), $@, []) of
[_, _Host] -> true;
_ -> false
end;
is_node_name(_Node) ->
false.
tick(Sock) ->
?to_port(Sock,[],[force]).
getstat(Socket) ->
case ssl_prim:getstat(Socket, [recv_cnt, send_cnt, send_pend]) of
{ok, Stat} ->
split_stat(Stat,0,0,0);
Error ->
Error
end.
split_stat([{recv_cnt, R}|Stat], _, W, P) ->
split_stat(Stat, R, W, P);
split_stat([{send_cnt, W}|Stat], R, _, P) ->
split_stat(Stat, R, W, P);
split_stat([{send_pend, P}|Stat], R, W, _) ->
split_stat(Stat, R, W, P);
split_stat([], R, W, P) ->
{ok, R, W, P}.
get_ssl_options(Type) ->
case init:get_argument(ssl_dist_opt) of
{ok, Args} ->
ssl_options(Type, Args);
_ ->
[]
end.
ssl_options(_,[]) ->
[];
ssl_options(server, [["server_certfile", Value]|T]) ->
[{certfile, Value} | ssl_options(server,T)];
ssl_options(client, [["client_certfile", Value]|T]) ->
[{certfile, Value} | ssl_options(client,T)];
ssl_options(server, [["server_cacertfile", Value]|T]) ->
[{cacertfile, Value} | ssl_options(server,T)];
ssl_options(server, [["server_keyfile", Value]|T]) ->
[{keyfile, Value} | ssl_options(server,T)];
ssl_options(Type, [["client_certfile", _Value]|T]) ->
ssl_options(Type,T);
ssl_options(Type, [["server_certfile", _Value]|T]) ->
ssl_options(Type,T);
ssl_options(Type, [[Item, Value]|T]) ->
[{atomize(Item),fixup(Value)} | ssl_options(Type,T)];
ssl_options(Type, [[Item,Value |T1]|T2]) ->
ssl_options(atomize(Type),[[Item,Value],T1|T2]);
ssl_options(_,_) ->
exit(malformed_ssl_dist_opt).
fixup(Value) ->
case catch list_to_integer(Value) of
{'EXIT',_} ->
Value;
Int ->
Int
end.
atomize(List) when is_list(List) ->
list_to_atom(List);
atomize(Atom) when is_atom(Atom) ->
Atom.
