The R13B03 release.OTP_R13B03

1 files changed, 417 insertions, 0 deletions

diff --git a/lib/kernel/src/inet6_tcp_dist.erl b/lib/kernel/src/inet6_tcp_dist.erl
new file mode 100644
index 0000000000..34cf582af7
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+++ b/lib/kernel/src/inet6_tcp_dist.erl
@@ -0,0 +1,417 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1997-2009. 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(inet6_tcp_dist).
+
+%% Handles the connection setup phase with other Erlang nodes.
+
+-export([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 inet6_tcp:send(Socket, Data, Opts) of
+            {error, closed} ->
+                self() ! {tcp_closed, Socket},
+                {error, closed};
+            R ->
+                R
+        end).
+
+
+-include("dist.hrl").
+-include("dist_util.hrl").
+
+%% ------------------------------------------------------------
+%%  Select this protocol based on node name
+%%  select(Node) => Bool
+%% ------------------------------------------------------------
+
+select(Node) ->
+    case split_node(atom_to_list(Node), $@, []) of
+        [_, Host] ->
+            case inet:getaddr(Host,inet6) of
+                {ok,_} -> true;
+                _ -> false
+            end;
+        _ -> false
+    end.
+
+%% ------------------------------------------------------------
+%% Create the listen socket, i.e. the port that this erlang
+%% node is accessible through.
+%% ------------------------------------------------------------
+
+listen(Name) ->
+    case inet6_tcp:listen(0, [{active, false}, {packet,2}]) 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_opt(?MODULE, accept_loop, [self(), Listen], [link, {priority, max}]).
+
+accept_loop(Kernel, Listen) ->
+    case inet6_tcp:accept(Listen) of
+        {ok, Socket} ->
+            Kernel ! {accept,self(),Socket,inet,tcp},
+            controller(Kernel, Socket),
+            accept_loop(Kernel, Listen);
+        Error ->
+            exit(Error)
+    end.
+
+controller(Kernel, Socket) ->
+    receive
+        {Kernel, controller, Pid} ->
+            flush_controller(Pid, Socket),
+            inet6_tcp:controlling_process(Socket, Pid),
+            flush_controller(Pid, Socket),
+            Pid ! {self(), controller};
+        {Kernel, unsupported_protocol} ->
+            exit(unsupported_protocol)
+    end.
+
+flush_controller(Pid, Socket) ->
+    receive
+        {tcp, Socket, Data} ->
+            Pid ! {tcp, Socket, Data},
+            flush_controller(Pid, Socket);
+        {tcp_closed, Socket} ->
+            Pid ! {tcp_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_opt(?MODULE, do_accept,
+	      [self(), AcceptPid, Socket, MyNode, Allowed, SetupTime],
+	      [link, {priority, max}]).
+
+do_accept(Kernel, AcceptPid, Socket, MyNode, Allowed, SetupTime) ->
+    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) -> inet6_tcp:send(S,D) end,
+                      f_recv = fun(S,N,T) -> inet6_tcp:recv(S,N,T) 
+                               end,
+                      f_setopts_pre_nodeup = 
+                      fun(S) ->
+                              inet:setopts(S, 
+                                           [{active, false},
+                                            {packet, 4},
+                                            nodelay()])
+                      end,
+                      f_setopts_post_nodeup = 
+                      fun(S) ->
+                              inet:setopts(S, 
+                                           [{active, true},
+                                            {deliver, port},
+                                            {packet, 4},
+                                            nodelay()])
+                      end,
+                      f_getll = fun(S) ->
+                                        inet:getll(S)
+                                end,
+                      f_address = fun get_remote_id/2,
+                      mf_tick = {?MODULE, tick},
+                      mf_getstat = {?MODULE,getstat}
+                     },
+                    dist_util:handshake_other_started(HSData);
+                {false,IP} ->
+                    error_msg("** Connection attempt from "
+                              "disallowed IP ~w ** ~n", [IP]),
+                    ?shutdown(no_node)
+            end
+    end.
+
+
+%% we may not always want the nodelay behaviour
+%% for performance reasons
+
+nodelay() ->
+    case application:get_env(kernel, dist_nodelay) of
+        undefined ->
+            {nodelay, true};
+        {ok, true} ->
+            {nodelay, true};
+        {ok, false} ->
+            {nodelay, false};
+        _ ->
+            {nodelay, true}
+    end.
+            
+
+%% ------------------------------------------------------------
+%% Get remote information about a Socket.
+%% ------------------------------------------------------------
+
+get_remote_id(Socket, Node) ->
+    {ok, Address} = inet:peername(Socket),
+    [_, Host] = split_node(atom_to_list(Node), $@, []),
+    #net_address {
+                  address = Address,
+                  host = Host,
+                  protocol = tcp,
+                  family = inet6 }.
+
+%% ------------------------------------------------------------
+%% Setup a new connection to another Erlang node.
+%% Performs the handshake with the other side.
+%% ------------------------------------------------------------
+
+setup(Node, Type, MyNode, LongOrShortNames,SetupTime) ->
+    spawn_opt(?MODULE, do_setup, 
+	      [self(), Node, Type, MyNode, LongOrShortNames, SetupTime],
+	      [link, {priority, max}]).
+
+do_setup(Kernel, Node, Type, MyNode, LongOrShortNames,SetupTime) ->
+    ?trace("~p~n",[{?MODULE,self(),setup,Node}]),
+    [Name, Address] = splitnode(Node, LongOrShortNames),
+    case inet:getaddr(Address, inet6) 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 inet6_tcp:connect(Ip, TcpPort, 
+                                          [{active, false}, 
+                                           {packet,2}]) 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 inet_tcp:send/2,
+			      f_recv = fun inet_tcp:recv/3,
+                              f_setopts_pre_nodeup = 
+                              fun(S) ->
+                                      inet:setopts
+                                        (S, 
+                                         [{active, false},
+                                          {packet, 4},
+                                          nodelay()])
+                              end,
+                              f_setopts_post_nodeup = 
+                              fun(S) ->
+                                      inet:setopts
+                                        (S, 
+                                         [{active, true},
+                                          {deliver, port},
+                                          {packet, 4},
+                                          nodelay()])
+                              end,
+			      f_getll = fun inet:getll/1,
+                              f_address = 
+                              fun(_,_) ->
+                                      #net_address {
+                                   address = {Ip,TcpPort},
+                                   host = Address,
+                                   protocol = tcp,
+                                   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) ->
+    inet6_tcp: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);
+                L when length(L) > 1, 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} = inet:sockname(Socket),
+    {ok, Host} = inet:gethostname(),
+    #net_address {
+                  address = Address,
+                  host = Host,
+                  protocol = tcp,
+                  family = inet6
+                 }.
+
+%% ------------------------------------------------------------
+%% 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 inet:peername(Socket) of
+        {ok, {IP, _}} ->
+            case inet: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,M5,M6,M7,M8}, {IP1,IP2,IP3,IP4,IP5,IP6,IP7,IP8}) ->
+    {M1 band IP1,
+     M2 band IP2,
+     M3 band IP3,
+     M4 band IP4,
+     M5 band IP5,
+     M6 band IP6,
+     M7 band IP7,
+     M8 band IP8 }.
+
+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 inet: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}.
+