diff options
Diffstat (limited to 'lib/ssh/src/ssh_connection.erl')
| -rw-r--r-- | lib/ssh/src/ssh_connection.erl | 986 |
1 files changed, 418 insertions, 568 deletions
diff --git a/lib/ssh/src/ssh_connection.erl b/lib/ssh/src/ssh_connection.erl index 9424cdd423..d0f2d54c06 100644 --- a/lib/ssh/src/ssh_connection.erl +++ b/lib/ssh/src/ssh_connection.erl @@ -1,18 +1,19 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2008-2012. All Rights Reserved. +%% Copyright Ericsson AB 2008-2015. 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/. +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at %% -%% 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. +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. %% %% %CopyrightEnd% %% @@ -29,319 +30,257 @@ -include("ssh_connect.hrl"). -include("ssh_transport.hrl"). +%% API -export([session_channel/2, session_channel/4, exec/4, shell/2, subsystem/4, send/3, send/4, send/5, - send_eof/2, adjust_window/3, open_pty/3, open_pty/7, - open_pty/9, setenv/5, window_change/4, window_change/6, - direct_tcpip/6, direct_tcpip/8, tcpip_forward/3, - cancel_tcpip_forward/3, signal/3, exit_status/3, encode_ip/1, close/2, - reply_request/4]). + send_eof/2, adjust_window/3, setenv/5, close/2, reply_request/4, + ptty_alloc/3, ptty_alloc/4]). + +%% Potential API currently unsupported and not tested +-export([window_change/4, window_change/6, + signal/3, exit_status/3]). --export([channel_data/6, handle_msg/4, channel_eof_msg/1, +%% Internal application API +-export([channel_data/5, handle_msg/3, channel_eof_msg/1, channel_close_msg/1, channel_success_msg/1, channel_failure_msg/1, + channel_status_msg/1, channel_adjust_window_msg/2, channel_data_msg/3, channel_open_msg/5, channel_open_confirmation_msg/4, channel_open_failure_msg/4, channel_request_msg/4, - global_request_msg/3, request_failure_msg/0, + request_failure_msg/0, request_success_msg/1, bind/4, unbind/3, unbind_channel/2, - bound_channel/3, messages/0]). + bound_channel/3, encode_ip/1]). %%-------------------------------------------------------------------- -%%% Internal application API +%%% API %%-------------------------------------------------------------------- %%-------------------------------------------------------------------- -%% Function: session_channel(ConnectionManager -%% [, InitialWindowSize, MaxPacketSize], -%% Timeout) -> {ok, } -%% ConnectionManager = pid() -%% InitialWindowSize = integer() -%% MaxPacketSize = integer() -%% +-spec session_channel(pid(), timeout()) -> {ok, channel_id()} | {error, timeout | closed}. +-spec session_channel(pid(), integer(), integer(), timeout()) -> {ok, channel_id()} | {error, timeout | closed}. + %% Description: Opens a channel for a ssh session. A session is a %% remote execution of a program. The program may be a shell, an %% application, a system command, or some built-in subsystem. %% -------------------------------------------------------------------- -session_channel(ConnectionManager, Timeout) -> - session_channel(ConnectionManager, + +session_channel(ConnectionHandler, Timeout) -> + session_channel(ConnectionHandler, ?DEFAULT_WINDOW_SIZE, ?DEFAULT_PACKET_SIZE, Timeout). -session_channel(ConnectionManager, InitialWindowSize, + +session_channel(ConnectionHandler, InitialWindowSize, MaxPacketSize, Timeout) -> - ssh_connection_manager:open_channel(ConnectionManager, "session", <<>>, + case ssh_connection_handler:open_channel(ConnectionHandler, "session", <<>>, InitialWindowSize, - MaxPacketSize, Timeout). + MaxPacketSize, Timeout) of + {open, Channel} -> + {ok, Channel}; + Error -> + Error + end. + %%-------------------------------------------------------------------- -%% Function: exec(ConnectionManager, ChannelId, Command, Timeout) -> -%% -%% ConnectionManager = pid() -%% ChannelId = integer() -%% Cmd = string() -%% Timeout = integer() -%% +-spec exec(pid(), channel_id(), string(), timeout()) -> + success | failure | {error, timeout | closed}. + %% Description: Will request that the server start the %% execution of the given command. %%-------------------------------------------------------------------- -exec(ConnectionManager, ChannelId, Command, TimeOut) -> - ssh_connection_manager:request(ConnectionManager, self(), ChannelId, "exec", - true, [?string(Command)], TimeOut). +exec(ConnectionHandler, ChannelId, Command, TimeOut) -> + ssh_connection_handler:request(ConnectionHandler, self(), ChannelId, "exec", + true, [?string(Command)], TimeOut). + %%-------------------------------------------------------------------- -%% Function: shell(ConnectionManager, ChannelId) -> -%% -%% ConnectionManager = pid() -%% ChannelId = integer() -%% +-spec shell(pid(), channel_id()) -> _. + %% Description: Will request that the user's default shell (typically %% defined in /etc/passwd in UNIX systems) be started at the other %% end. %%-------------------------------------------------------------------- -shell(ConnectionManager, ChannelId) -> - ssh_connection_manager:request(ConnectionManager, self(), ChannelId, +shell(ConnectionHandler, ChannelId) -> + ssh_connection_handler:request(ConnectionHandler, self(), ChannelId, "shell", false, <<>>, 0). %%-------------------------------------------------------------------- -%% Function: subsystem(ConnectionManager, ChannelId, SubSystem, TimeOut) -> -%% -%% ConnectionManager = pid() -%% ChannelId = integer() -%% SubSystem = string() -%% TimeOut = integer() -%% +-spec subsystem(pid(), channel_id(), string(), timeout()) -> + success | failure | {error, timeout | closed}. %% %% Description: Executes a predefined subsystem. %%-------------------------------------------------------------------- -subsystem(ConnectionManager, ChannelId, SubSystem, TimeOut) -> - ssh_connection_manager:request(ConnectionManager, self(), +subsystem(ConnectionHandler, ChannelId, SubSystem, TimeOut) -> + ssh_connection_handler:request(ConnectionHandler, self(), ChannelId, "subsystem", true, [?string(SubSystem)], TimeOut). %%-------------------------------------------------------------------- -%% Function: send(ConnectionManager, ChannelId, Type, Data, [TimeOut]) -> +-spec send(pid(), channel_id(), iodata()) -> + ok | {error, closed}. +-spec send(pid(), channel_id(), integer()| iodata(), timeout() | iodata()) -> + ok | {error, timeout} | {error, closed}. +-spec send(pid(), channel_id(), integer(), iodata(), timeout()) -> + ok | {error, timeout} | {error, closed}. %% %% %% Description: Sends channel data. %%-------------------------------------------------------------------- -send(ConnectionManager, ChannelId, Data) -> - send(ConnectionManager, ChannelId, 0, Data, infinity). -send(ConnectionManager, ChannelId, Data, TimeOut) when is_integer(TimeOut) -> - send(ConnectionManager, ChannelId, 0, Data, TimeOut); -send(ConnectionManager, ChannelId, Data, infinity) -> - send(ConnectionManager, ChannelId, 0, Data, infinity); -send(ConnectionManager, ChannelId, Type, Data) -> - send(ConnectionManager, ChannelId, Type, Data, infinity). -send(ConnectionManager, ChannelId, Type, Data, TimeOut) -> - ssh_connection_manager:send(ConnectionManager, ChannelId, +send(ConnectionHandler, ChannelId, Data) -> + send(ConnectionHandler, ChannelId, 0, Data, infinity). +send(ConnectionHandler, ChannelId, Data, TimeOut) when is_integer(TimeOut) -> + send(ConnectionHandler, ChannelId, 0, Data, TimeOut); +send(ConnectionHandler, ChannelId, Data, infinity) -> + send(ConnectionHandler, ChannelId, 0, Data, infinity); +send(ConnectionHandler, ChannelId, Type, Data) -> + send(ConnectionHandler, ChannelId, Type, Data, infinity). +send(ConnectionHandler, ChannelId, Type, Data, TimeOut) -> + ssh_connection_handler:send(ConnectionHandler, ChannelId, Type, Data, TimeOut). %%-------------------------------------------------------------------- -%% Function: send_eof(ConnectionManager, ChannelId) -> +-spec send_eof(pid(), channel_id()) -> ok | {error, closed}. %% %% %% Description: Sends eof on the channel <ChannelId>. %%-------------------------------------------------------------------- -send_eof(ConnectionManager, Channel) -> - ssh_connection_manager:send_eof(ConnectionManager, Channel). +send_eof(ConnectionHandler, Channel) -> + ssh_connection_handler:send_eof(ConnectionHandler, Channel). %%-------------------------------------------------------------------- -%% Function: adjust_window(ConnectionManager, Channel, Bytes) -> +-spec adjust_window(pid(), channel_id(), integer()) -> ok | {error, closed}. %% %% %% Description: Adjusts the ssh flowcontrol window. %%-------------------------------------------------------------------- -adjust_window(ConnectionManager, Channel, Bytes) -> - ssh_connection_manager:adjust_window(ConnectionManager, Channel, Bytes). +adjust_window(ConnectionHandler, Channel, Bytes) -> + ssh_connection_handler:adjust_window(ConnectionHandler, Channel, Bytes). %%-------------------------------------------------------------------- -%% Function: setenv(ConnectionManager, ChannelId, Var, Value, TimeOut) -> +-spec setenv(pid(), channel_id(), string(), string(), timeout()) -> + success | failure | {error, timeout | closed}. %% %% %% Description: Environment variables may be passed to the shell/command to be %% started later. %%-------------------------------------------------------------------- -setenv(ConnectionManager, ChannelId, Var, Value, TimeOut) -> - ssh_connection_manager:request(ConnectionManager, ChannelId, +setenv(ConnectionHandler, ChannelId, Var, Value, TimeOut) -> + ssh_connection_handler:request(ConnectionHandler, ChannelId, "env", true, [?string(Var), ?string(Value)], TimeOut). %%-------------------------------------------------------------------- -%% Function: close(ConnectionManager, ChannelId) -> +-spec close(pid(), channel_id()) -> ok. %% %% %% Description: Sends a close message on the channel <ChannelId>. %%-------------------------------------------------------------------- -close(ConnectionManager, ChannelId) -> - ssh_connection_manager:close(ConnectionManager, ChannelId). - +close(ConnectionHandler, ChannelId) -> + ssh_connection_handler:close(ConnectionHandler, ChannelId). %%-------------------------------------------------------------------- -%% Function: reply_request(ConnectionManager, WantReply, Status, CannelId) ->_ +-spec reply_request(pid(), boolean(), success | failure, channel_id()) -> ok. %% %% %% Description: Send status replies to requests that want such replies. %%-------------------------------------------------------------------- -reply_request(ConnectionManager, true, Status, ChannelId) -> - ssh_connection_manager:reply_request(ConnectionManager, Status, ChannelId), - ok; +reply_request(ConnectionHandler, true, Status, ChannelId) -> + ssh_connection_handler:reply_request(ConnectionHandler, Status, ChannelId); reply_request(_,false, _, _) -> ok. - %%-------------------------------------------------------------------- -%% Function: window_change(ConnectionManager, Channel, Width, Height) -> +-spec ptty_alloc(pid(), channel_id(), proplists:proplist()) -> + success | failiure | {error, closed}. +-spec ptty_alloc(pid(), channel_id(), proplists:proplist(), timeout()) -> + success | failiure | {error, timeout} | {error, closed}. + %% %% -%% Description: Not yet officialy supported. +%% Description: Sends a ssh connection protocol pty_req. +%%-------------------------------------------------------------------- +ptty_alloc(ConnectionHandler, Channel, Options) -> + ptty_alloc(ConnectionHandler, Channel, Options, infinity). +ptty_alloc(ConnectionHandler, Channel, Options0, TimeOut) -> + Options = backwards_compatible(Options0, []), + {Width, PixWidth} = pty_default_dimensions(width, Options), + {Height, PixHeight} = pty_default_dimensions(height, Options), + pty_req(ConnectionHandler, Channel, + proplists:get_value(term, Options, os:getenv("TERM", ?DEFAULT_TERMINAL)), + proplists:get_value(width, Options, Width), + proplists:get_value(height, Options, Height), + proplists:get_value(pixel_widh, Options, PixWidth), + proplists:get_value(pixel_height, Options, PixHeight), + proplists:get_value(pty_opts, Options, []), TimeOut + ). +%%-------------------------------------------------------------------- +%% Not yet officialy supported! The following functions are part of the +%% initial contributed ssh application. They are untested. Do we want them? +%% Should they be documented and tested? %%-------------------------------------------------------------------- -window_change(ConnectionManager, Channel, Width, Height) -> - window_change(ConnectionManager, Channel, Width, Height, 0, 0). -window_change(ConnectionManager, Channel, Width, Height, +window_change(ConnectionHandler, Channel, Width, Height) -> + window_change(ConnectionHandler, Channel, Width, Height, 0, 0). +window_change(ConnectionHandler, Channel, Width, Height, PixWidth, PixHeight) -> - ssh_connection_manager:request(ConnectionManager, Channel, + ssh_connection_handler:request(ConnectionHandler, Channel, "window-change", false, [?uint32(Width), ?uint32(Height), ?uint32(PixWidth), ?uint32(PixHeight)], 0). -%%-------------------------------------------------------------------- -%% Function: signal(ConnectionManager, Channel, Sig) -> -%% -%% -%% Description: Not yet officialy supported. -%%-------------------------------------------------------------------- -signal(ConnectionManager, Channel, Sig) -> - ssh_connection_manager:request(ConnectionManager, Channel, + +signal(ConnectionHandler, Channel, Sig) -> + ssh_connection_handler:request(ConnectionHandler, Channel, "signal", false, [?string(Sig)], 0). -%%-------------------------------------------------------------------- -%% Function: signal(ConnectionManager, Channel, Status) -> -%% -%% -%% Description: Not yet officialy supported. -%%-------------------------------------------------------------------- -exit_status(ConnectionManager, Channel, Status) -> - ssh_connection_manager:request(ConnectionManager, Channel, - "exit-status", false, [?uint32(Status)], 0). +exit_status(ConnectionHandler, Channel, Status) -> + ssh_connection_handler:request(ConnectionHandler, Channel, + "exit-status", false, [?uint32(Status)], 0). %%-------------------------------------------------------------------- -%% Function: open_pty(ConnectionManager, Channel, TimeOut) -> -%% -%% -%% Description: Not yet officialy supported. +%%% Internal API %%-------------------------------------------------------------------- -open_pty(ConnectionManager, Channel, TimeOut) -> - open_pty(ConnectionManager, Channel, - os:getenv("TERM"), 80, 24, [], TimeOut). - -open_pty(ConnectionManager, Channel, Term, Width, Height, PtyOpts, TimeOut) -> - open_pty(ConnectionManager, Channel, Term, Width, - Height, 0, 0, PtyOpts, TimeOut). - -open_pty(ConnectionManager, Channel, Term, Width, Height, - PixWidth, PixHeight, PtyOpts, TimeOut) -> - ssh_connection_manager:request(ConnectionManager, - Channel, "pty-req", true, - [?string(Term), - ?uint32(Width), ?uint32(Height), - ?uint32(PixWidth),?uint32(PixHeight), - encode_pty_opts(PtyOpts)], TimeOut). - +l2b(L) when is_integer(hd(L)) -> + try list_to_binary(L) + of + B -> B + catch + _:_ -> + unicode:characters_to_binary(L) + end; +l2b([H|T]) -> + << (l2b(H))/binary, (l2b(T))/binary >>; +l2b(B) when is_binary(B) -> + B; +l2b([]) -> + <<>>. -%%-------------------------------------------------------------------- -%% Function: direct_tcpip(ConnectionManager, RemoteHost, -%% RemotePort, OrigIP, OrigPort, Timeout) -> -%% -%% -%% Description: Not yet officialy supported. -%%-------------------------------------------------------------------- -direct_tcpip(ConnectionManager, RemoteHost, - RemotePort, OrigIP, OrigPort, Timeout) -> - direct_tcpip(ConnectionManager, RemoteHost, RemotePort, OrigIP, OrigPort, - ?DEFAULT_WINDOW_SIZE, ?DEFAULT_PACKET_SIZE, Timeout). - -direct_tcpip(ConnectionManager, RemoteIP, RemotePort, OrigIP, OrigPort, - InitialWindowSize, MaxPacketSize, Timeout) -> - case {encode_ip(RemoteIP), encode_ip(OrigIP)} of - {false, _} -> - {error, einval}; - {_, false} -> - {error, einval}; - {RIP, OIP} -> - ssh_connection_manager:open_channel(ConnectionManager, - "direct-tcpip", - [?string(RIP), - ?uint32(RemotePort), - ?string(OIP), - ?uint32(OrigPort)], - InitialWindowSize, - MaxPacketSize, - Timeout) - end. -%%-------------------------------------------------------------------- -%% Function: tcpip_forward(ConnectionManager, BindIP, BindPort) -> -%% -%% -%% Description: Not yet officialy supported. -%%-------------------------------------------------------------------- -tcpip_forward(ConnectionManager, BindIP, BindPort) -> - case encode_ip(BindIP) of - false -> - {error, einval}; - IPStr -> - ssh_connection_manager:global_request(ConnectionManager, - "tcpip-forward", true, - [?string(IPStr), - ?uint32(BindPort)]) - end. -%%-------------------------------------------------------------------- -%% Function: cancel_tcpip_forward(ConnectionManager, BindIP, Port) -> -%% -%% -%% Description: Not yet officialy supported. -%%-------------------------------------------------------------------- -cancel_tcpip_forward(ConnectionManager, BindIP, Port) -> - case encode_ip(BindIP) of - false -> - {error, einval}; - IPStr -> - ssh_connection_manager:global_request(ConnectionManager, - "cancel-tcpip-forward", true, - [?string(IPStr), - ?uint32(Port)]) - end. + -%%-------------------------------------------------------------------- -%%% Internal API -%%-------------------------------------------------------------------- -channel_data(ChannelId, DataType, Data, Connection, ConnectionPid, From) +channel_data(ChannelId, DataType, Data, Connection, From) when is_list(Data)-> - channel_data(ChannelId, DataType, - list_to_binary(Data), Connection, ConnectionPid, From); + channel_data(ChannelId, DataType, l2b(Data), Connection, From); channel_data(ChannelId, DataType, Data, - #connection{channel_cache = Cache} = Connection, ConnectionPid, + #connection{channel_cache = Cache} = Connection, From) -> - case ssh_channel:cache_lookup(Cache, ChannelId) of #channel{remote_id = Id, sent_close = false} = Channel0 -> - {SendList, Channel} = update_send_window(Channel0#channel{flow_control = From}, DataType, - Data, Connection), + {SendList, Channel} = + update_send_window(Channel0#channel{flow_control = From}, DataType, + Data, Connection), Replies = lists:map(fun({SendDataType, SendData}) -> - {connection_reply, ConnectionPid, + {connection_reply, channel_data_msg(Id, SendDataType, SendData)} end, SendList), - FlowCtrlMsgs = flow_control(Replies, - Channel, - Cache), + FlowCtrlMsgs = flow_control(Replies, Channel, Cache), {{replies, Replies ++ FlowCtrlMsgs}, Connection}; _ -> - gen_server:reply(From, {error, closed}), - {noreply, Connection} + {{replies,[{channel_request_reply,From,{error,closed}}]}, Connection} end. handle_msg(#ssh_msg_channel_open_confirmation{recipient_channel = ChannelId, sender_channel = RemoteId, initial_window_size = WindowSz, maximum_packet_size = PacketSz}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> #channel{remote_id = undefined} = Channel = ssh_channel:cache_lookup(Cache, ChannelId), @@ -357,7 +296,7 @@ handle_msg(#ssh_msg_channel_open_failure{recipient_channel = ChannelId, reason = Reason, description = Descr, lang = Lang}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> Channel = ssh_channel:cache_lookup(Cache, ChannelId), ssh_channel:cache_delete(Cache, ChannelId), {Reply, Connection} = @@ -365,51 +304,59 @@ handle_msg(#ssh_msg_channel_open_failure{recipient_channel = ChannelId, {{replies, [Reply]}, Connection}; handle_msg(#ssh_msg_channel_success{recipient_channel = ChannelId}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> Channel = ssh_channel:cache_lookup(Cache, ChannelId), - {Reply, Connection} = reply_msg(Channel, Connection0, success), - {{replies, [Reply]}, Connection}; + case reply_msg(Channel, Connection0, success) of + {[], Connection} -> + {noreply, Connection}; + {Reply, Connection} -> + {{replies, [Reply]}, Connection} + end; handle_msg(#ssh_msg_channel_failure{recipient_channel = ChannelId}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> Channel = ssh_channel:cache_lookup(Cache, ChannelId), - {Reply, Connection} = reply_msg(Channel, Connection0, failure), - {{replies, [Reply]}, Connection}; + case reply_msg(Channel, Connection0, failure) of + {[], Connection} -> + {noreply, Connection}; + {Reply, Connection} -> + {{replies, [Reply]}, Connection} + end; + handle_msg(#ssh_msg_channel_eof{recipient_channel = ChannelId}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> Channel = ssh_channel:cache_lookup(Cache, ChannelId), {Reply, Connection} = reply_msg(Channel, Connection0, {eof, ChannelId}), {{replies, [Reply]}, Connection}; handle_msg(#ssh_msg_channel_close{recipient_channel = ChannelId}, - #connection{channel_cache = Cache} = Connection0, - ConnectionPid, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> case ssh_channel:cache_lookup(Cache, ChannelId) of - #channel{sent_close = Closed, remote_id = RemoteId, flow_control = FlowControl} = Channel -> + #channel{sent_close = Closed, remote_id = RemoteId, + flow_control = FlowControl} = Channel -> ssh_channel:cache_delete(Cache, ChannelId), {CloseMsg, Connection} = reply_msg(Channel, Connection0, {closed, ChannelId}), - - ConnReplyMsgs = - case Closed of - true -> []; - false -> - RemoteCloseMsg = channel_close_msg(RemoteId), - [{connection_reply, ConnectionPid, RemoteCloseMsg}] - end, - - %% if there was a send() in progress, make it fail - SendReplyMsgs = - case FlowControl of - undefined -> []; - From -> - [{flow_control, From, {error, closed}}] - end, - - Replies = ConnReplyMsgs ++ [CloseMsg] ++ SendReplyMsgs, - {{replies, Replies}, Connection}; + ConnReplyMsgs = + case Closed of + true -> []; + false -> + RemoteCloseMsg = channel_close_msg(RemoteId), + [{connection_reply, RemoteCloseMsg}] + end, + + %% if there was a send() in progress, make it fail + SendReplyMsgs = + case FlowControl of + undefined -> []; + From -> + [{flow_control, From, {error, closed}}] + end, + + Replies = ConnReplyMsgs ++ [CloseMsg] ++ SendReplyMsgs, + {{replies, Replies}, Connection}; undefined -> {{replies, []}, Connection0} @@ -417,21 +364,24 @@ handle_msg(#ssh_msg_channel_close{recipient_channel = ChannelId}, handle_msg(#ssh_msg_channel_data{recipient_channel = ChannelId, data = Data}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> - #channel{recv_window_size = Size} = Channel = - ssh_channel:cache_lookup(Cache, ChannelId), - WantedSize = Size - size(Data), - ssh_channel:cache_update(Cache, Channel#channel{ - recv_window_size = WantedSize}), - {Replies, Connection} = - channel_data_reply(Cache, Channel, Connection0, 0, Data), - {{replies, Replies}, Connection}; + case ssh_channel:cache_lookup(Cache, ChannelId) of + #channel{recv_window_size = Size} = Channel -> + WantedSize = Size - size(Data), + ssh_channel:cache_update(Cache, Channel#channel{ + recv_window_size = WantedSize}), + {Replies, Connection} = + channel_data_reply(Cache, Channel, Connection0, 0, Data), + {{replies, Replies}, Connection}; + undefined -> + {noreply, Connection0} + end; handle_msg(#ssh_msg_channel_extended_data{recipient_channel = ChannelId, data_type_code = DataType, data = Data}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> #channel{recv_window_size = Size} = Channel = ssh_channel:cache_lookup(Cache, ChannelId), @@ -444,9 +394,7 @@ handle_msg(#ssh_msg_channel_extended_data{recipient_channel = ChannelId, handle_msg(#ssh_msg_channel_window_adjust{recipient_channel = ChannelId, bytes_to_add = Add}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, _) -> - + #connection{channel_cache = Cache} = Connection, _) -> #channel{send_window_size = Size, remote_id = RemoteId} = Channel0 = ssh_channel:cache_lookup(Cache, ChannelId), @@ -455,8 +403,7 @@ handle_msg(#ssh_msg_channel_window_adjust{recipient_channel = ChannelId, 0, undefined, Connection), Replies = lists:map(fun({Type, Data}) -> - {connection_reply, ConnectionPid, - channel_data_msg(RemoteId, Type, Data)} + {connection_reply, channel_data_msg(RemoteId, Type, Data)} end, SendList), FlowCtrlMsgs = flow_control(Channel, Cache), {{replies, Replies ++ FlowCtrlMsgs}, Connection}; @@ -464,96 +411,56 @@ handle_msg(#ssh_msg_channel_window_adjust{recipient_channel = ChannelId, handle_msg(#ssh_msg_channel_open{channel_type = "session" = Type, sender_channel = RemoteId, initial_window_size = WindowSz, - maximum_packet_size = PacketSz}, Connection0, - ConnectionPid, server) -> - - try setup_session(Connection0, ConnectionPid, RemoteId, - Type, WindowSz, PacketSz) of - Result -> - Result - catch _:_ -> + maximum_packet_size = PacketSz}, + #connection{options = SSHopts} = Connection0, + server) -> + MinAcceptedPackSz = proplists:get_value(minimal_remote_max_packet_size, SSHopts, 0), + + if + MinAcceptedPackSz =< PacketSz -> + try setup_session(Connection0, RemoteId, + Type, WindowSz, PacketSz) of + Result -> + Result + catch _:_ -> + FailMsg = channel_open_failure_msg(RemoteId, + ?SSH_OPEN_CONNECT_FAILED, + "Connection refused", "en"), + {{replies, [{connection_reply, FailMsg}]}, + Connection0} + end; + + MinAcceptedPackSz > PacketSz -> FailMsg = channel_open_failure_msg(RemoteId, - ?SSH_OPEN_CONNECT_FAILED, - "Connection refused", "en"), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, - Connection0} + ?SSH_OPEN_ADMINISTRATIVELY_PROHIBITED, + lists:concat(["Maximum packet size below ",MinAcceptedPackSz, + " not supported"]), "en"), + {{replies, [{connection_reply, FailMsg}]}, Connection0} end; handle_msg(#ssh_msg_channel_open{channel_type = "session", sender_channel = RemoteId}, - Connection, ConnectionPid, client) -> + Connection, + client) -> %% Client implementations SHOULD reject any session channel open %% requests to make it more difficult for a corrupt server to attack the %% client. See See RFC 4254 6.1. FailMsg = channel_open_failure_msg(RemoteId, ?SSH_OPEN_CONNECT_FAILED, "Connection refused", "en"), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, + {{replies, [{connection_reply, FailMsg}]}, Connection}; -handle_msg(#ssh_msg_channel_open{channel_type = "forwarded-tcpip" = Type, - sender_channel = RemoteId, - initial_window_size = RWindowSz, - maximum_packet_size = RPacketSz, - data = Data}, - #connection{channel_cache = Cache} = Connection0, - ConnectionPid, server) -> - <<?UINT32(ALen), Address:ALen/binary, ?UINT32(Port), - ?UINT32(OLen), Orig:OLen/binary, ?UINT32(OrigPort)>> = Data, - - case bound_channel(Address, Port, Connection0) of - undefined -> - FailMsg = channel_open_failure_msg(RemoteId, - ?SSH_OPEN_CONNECT_FAILED, - "Connection refused", "en"), - {{replies, - [{connection_reply, ConnectionPid, FailMsg}]}, Connection0}; - ChannelPid -> - {ChannelId, Connection1} = new_channel_id(Connection0), - LWindowSz = ?DEFAULT_WINDOW_SIZE, - LPacketSz = ?DEFAULT_PACKET_SIZE, - Channel = #channel{type = Type, - sys = "none", - user = ChannelPid, - local_id = ChannelId, - recv_window_size = LWindowSz, - recv_packet_size = LPacketSz, - send_window_size = RWindowSz, - send_packet_size = RPacketSz}, - ssh_channel:cache_update(Cache, Channel), - OpenConfMsg = channel_open_confirmation_msg(RemoteId, ChannelId, - LWindowSz, LPacketSz), - {OpenMsg, Connection} = - reply_msg(Channel, Connection1, - {open, Channel, {forwarded_tcpip, - decode_ip(Address), Port, - decode_ip(Orig), OrigPort}}), - {{replies, [{connection_reply, ConnectionPid, OpenConfMsg}, - OpenMsg]}, Connection} - end; - -handle_msg(#ssh_msg_channel_open{channel_type = "forwarded-tcpip", - sender_channel = RemoteId}, - Connection, ConnectionPid, client) -> - %% Client implementations SHOULD reject direct TCP/IP open requests for - %% security reasons. See RFC 4254 7.2. - FailMsg = channel_open_failure_msg(RemoteId, - ?SSH_OPEN_CONNECT_FAILED, - "Connection refused", "en"), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, Connection}; - - -handle_msg(#ssh_msg_channel_open{sender_channel = RemoteId}, Connection, - ConnectionPid, _) -> +handle_msg(#ssh_msg_channel_open{sender_channel = RemoteId}, Connection, _) -> FailMsg = channel_open_failure_msg(RemoteId, ?SSH_OPEN_ADMINISTRATIVELY_PROHIBITED, "Not allowed", "en"), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, Connection}; + {{replies, [{connection_reply, FailMsg}]}, Connection}; handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "exit-status", data = Data}, - #connection{channel_cache = Cache} = Connection, _, _) -> + #connection{channel_cache = Cache} = Connection, _) -> <<?UINT32(Status)>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), {Reply, Connection} = @@ -564,8 +471,7 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "exit-signal", want_reply = false, data = Data}, - #connection{channel_cache = Cache} = Connection0, - ConnectionPid, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> <<?UINT32(SigLen), SigName:SigLen/binary, ?BOOLEAN(_Core), ?UINT32(ErrLen), Err:ErrLen/binary, @@ -578,14 +484,14 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, binary_to_list(Err), binary_to_list(Lang)}), CloseMsg = channel_close_msg(RemoteId), - {{replies, [{connection_reply, ConnectionPid, CloseMsg}, Reply]}, + {{replies, [{connection_reply, CloseMsg}, Reply]}, Connection}; handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "xon-xoff", want_reply = false, data = Data}, - #connection{channel_cache = Cache} = Connection, _, _) -> + #connection{channel_cache = Cache} = Connection, _) -> <<?BOOLEAN(CDo)>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), {Reply, Connection} = @@ -596,7 +502,7 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "window-change", want_reply = false, data = Data}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> <<?UINT32(Width),?UINT32(Height), ?UINT32(PixWidth), ?UINT32(PixHeight)>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), @@ -609,7 +515,7 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "signal", data = Data}, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> <<?UINT32(SigLen), SigName:SigLen/binary>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), @@ -622,8 +528,7 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "subsystem", want_reply = WantReply, data = Data}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, server) -> + #connection{channel_cache = Cache} = Connection, server) -> <<?UINT32(SsLen), SsName:SsLen/binary>> = Data, #channel{remote_id = RemoteId} = Channel0 = @@ -631,22 +536,23 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, ReplyMsg = {subsystem, ChannelId, WantReply, binary_to_list(SsName)}, - try start_subsytem(SsName, Connection, Channel0, ReplyMsg) of - {ok, Pid} -> - erlang:monitor(process, Pid), - Channel = Channel0#channel{user = Pid}, - ssh_channel:cache_update(Cache, Channel), - Reply = {connection_reply, ConnectionPid, - channel_success_msg(RemoteId)}, - {{replies, [Reply]}, Connection} - catch _:_ -> - Reply = {connection_reply, ConnectionPid, - channel_failure_msg(RemoteId)}, - {{replies, [Reply]}, Connection} + try + {ok, Pid} = start_subsystem(SsName, Connection, Channel0, ReplyMsg), + erlang:monitor(process, Pid), + Channel = Channel0#channel{user = Pid}, + ssh_channel:cache_update(Cache, Channel), + Reply = {connection_reply, + channel_success_msg(RemoteId)}, + {{replies, [Reply]}, Connection} + catch + _:_ -> + ErrorReply = {connection_reply, + channel_failure_msg(RemoteId)}, + {{replies, [ErrorReply]}, Connection} end; handle_msg(#ssh_msg_channel_request{request_type = "subsystem"}, - Connection, _, client) -> + Connection, client) -> %% The client SHOULD ignore subsystem requests. See RFC 4254 6.5. {{replies, []}, Connection}; @@ -654,8 +560,7 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "pty-req", want_reply = WantReply, data = Data}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, server) -> + #connection{channel_cache = Cache} = Connection, server) -> <<?UINT32(TermLen), BTermName:TermLen/binary, ?UINT32(Width),?UINT32(Height), ?UINT32(PixWidth), ?UINT32(PixHeight), @@ -667,27 +572,26 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, Channel = ssh_channel:cache_lookup(Cache, ChannelId), - handle_cli_msg(Connection, ConnectionPid, Channel, + handle_cli_msg(Connection, Channel, {pty, ChannelId, WantReply, PtyRequest}); handle_msg(#ssh_msg_channel_request{request_type = "pty-req"}, - Connection, _, client) -> + Connection, client) -> %% The client SHOULD ignore pty requests. See RFC 4254 6.2. {{replies, []}, Connection}; handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "shell", want_reply = WantReply}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, server) -> + #connection{channel_cache = Cache} = Connection, server) -> Channel = ssh_channel:cache_lookup(Cache, ChannelId), - handle_cli_msg(Connection, ConnectionPid, Channel, + handle_cli_msg(Connection, Channel, {shell, ChannelId, WantReply}); handle_msg(#ssh_msg_channel_request{request_type = "shell"}, - Connection, _, client) -> + Connection, client) -> %% The client SHOULD ignore shell requests. See RFC 4254 6.5. {{replies, []}, Connection}; @@ -695,17 +599,16 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "exec", want_reply = WantReply, data = Data}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, server) -> + #connection{channel_cache = Cache} = Connection, server) -> <<?UINT32(Len), Command:Len/binary>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), - handle_cli_msg(Connection, ConnectionPid, Channel, + handle_cli_msg(Connection, Channel, {exec, ChannelId, WantReply, binary_to_list(Command)}); handle_msg(#ssh_msg_channel_request{request_type = "exec"}, - Connection, _, client) -> + Connection, client) -> %% The client SHOULD ignore exec requests. See RFC 4254 6.5. {{replies, []}, Connection}; @@ -713,31 +616,30 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = "env", want_reply = WantReply, data = Data}, - #connection{channel_cache = Cache} = Connection, - ConnectionPid, server) -> + #connection{channel_cache = Cache} = Connection, server) -> <<?UINT32(VarLen), Var:VarLen/binary, ?UINT32(ValueLen), Value:ValueLen/binary>> = Data, Channel = ssh_channel:cache_lookup(Cache, ChannelId), - handle_cli_msg(Connection, ConnectionPid, Channel, + handle_cli_msg(Connection, Channel, {env, ChannelId, WantReply, Var, Value}); handle_msg(#ssh_msg_channel_request{request_type = "env"}, - Connection, _, client) -> + Connection, client) -> %% The client SHOULD ignore env requests. {{replies, []}, Connection}; handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, request_type = _Other, - want_reply = WantReply}, #connection{channel_cache = Cache} = Connection, - ConnectionPid, _) -> + want_reply = WantReply}, + #connection{channel_cache = Cache} = Connection, _) -> if WantReply == true -> case ssh_channel:cache_lookup(Cache, ChannelId) of #channel{remote_id = RemoteId} -> FailMsg = channel_failure_msg(RemoteId), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, + {{replies, [{connection_reply, FailMsg}]}, Connection}; undefined -> %% Chanel has been closed {noreply, Connection} @@ -748,61 +650,73 @@ handle_msg(#ssh_msg_channel_request{recipient_channel = ChannelId, handle_msg(#ssh_msg_global_request{name = _Type, want_reply = WantReply, - data = _Data}, Connection, - ConnectionPid, _) -> + data = _Data}, Connection, _) -> if WantReply == true -> FailMsg = request_failure_msg(), - {{replies, [{connection_reply, ConnectionPid, FailMsg}]}, + {{replies, [{connection_reply, FailMsg}]}, Connection}; true -> {noreply, Connection} end; -%%% This transport message will also be handled at the connection level +handle_msg(#ssh_msg_request_failure{}, + #connection{requests = [{_, From} | Rest]} = Connection, _) -> + {{replies, [{channel_request_reply, From, {failure, <<>>}}]}, + Connection#connection{requests = Rest}}; +handle_msg(#ssh_msg_request_success{data = Data}, + #connection{requests = [{_, From} | Rest]} = Connection, _) -> + {{replies, [{channel_request_reply, From, {success, Data}}]}, + Connection#connection{requests = Rest}}; + handle_msg(#ssh_msg_disconnect{code = Code, description = Description, language = _Lang }, - #connection{channel_cache = Cache} = Connection0, _, _) -> + #connection{channel_cache = Cache} = Connection0, _) -> {Connection, Replies} = ssh_channel:cache_foldl(fun(Channel, {Connection1, Acc}) -> {Reply, Connection2} = reply_msg(Channel, - Connection1, {closed, Channel#channel.local_id}), + Connection1, + {closed, Channel#channel.local_id}), {Connection2, [Reply | Acc]} end, {Connection0, []}, Cache), ssh_channel:cache_delete(Cache), {disconnect, {Code, Description}, {{replies, Replies}, Connection}}. -handle_cli_msg(#connection{channel_cache = Cache} = Connection0, - ConnectionPid, +handle_cli_msg(#connection{channel_cache = Cache} = Connection, #channel{user = undefined, + remote_id = RemoteId, local_id = ChannelId} = Channel0, Reply0) -> - case (catch start_cli(Connection0, ChannelId)) of + case (catch start_cli(Connection, ChannelId)) of {ok, Pid} -> erlang:monitor(process, Pid), Channel = Channel0#channel{user = Pid}, ssh_channel:cache_update(Cache, Channel), - {Reply, Connection} = reply_msg(Channel, Connection0, Reply0), - {{replies, [Reply]}, Connection}; - _ -> - Reply = {connection_reply, ConnectionPid, - request_failure_msg()}, - {{replies, [Reply]}, Connection0} + {Reply, Connection1} = reply_msg(Channel, Connection, Reply0), + {{replies, [Reply]}, Connection1}; + _Other -> + Reply = {connection_reply, + channel_failure_msg(RemoteId)}, + {{replies, [Reply]}, Connection} end; -handle_cli_msg(Connection0, _, Channel, Reply0) -> +handle_cli_msg(Connection0, Channel, Reply0) -> {Reply, Connection} = reply_msg(Channel, Connection0, Reply0), {{replies, [Reply]}, Connection}. - channel_eof_msg(ChannelId) -> #ssh_msg_channel_eof{recipient_channel = ChannelId}. channel_close_msg(ChannelId) -> #ssh_msg_channel_close {recipient_channel = ChannelId}. +channel_status_msg({success, ChannelId}) -> + channel_success_msg(ChannelId); +channel_status_msg({failure, ChannelId}) -> + channel_failure_msg(ChannelId). + channel_success_msg(ChannelId) -> #ssh_msg_channel_success{recipient_channel = ChannelId}. @@ -847,10 +761,6 @@ channel_request_msg(ChannelId, Type, WantReply, Data) -> want_reply = WantReply, data = Data}. -global_request_msg(Type, WantReply, Data) -> - #ssh_msg_global_request{name = Type, - want_reply = WantReply, - data = Data}. request_failure_msg() -> #ssh_msg_request_failure{}. @@ -880,70 +790,6 @@ bound_channel(IP, Port, Connection) -> _ -> undefined end. -messages() -> - [ {ssh_msg_global_request, ?SSH_MSG_GLOBAL_REQUEST, - [string, - boolean, - '...']}, - - {ssh_msg_request_success, ?SSH_MSG_REQUEST_SUCCESS, - ['...']}, - - {ssh_msg_request_failure, ?SSH_MSG_REQUEST_FAILURE, - []}, - - {ssh_msg_channel_open, ?SSH_MSG_CHANNEL_OPEN, - [string, - uint32, - uint32, - uint32, - '...']}, - - {ssh_msg_channel_open_confirmation, ?SSH_MSG_CHANNEL_OPEN_CONFIRMATION, - [uint32, - uint32, - uint32, - uint32, - '...']}, - - {ssh_msg_channel_open_failure, ?SSH_MSG_CHANNEL_OPEN_FAILURE, - [uint32, - uint32, - string, - string]}, - - {ssh_msg_channel_window_adjust, ?SSH_MSG_CHANNEL_WINDOW_ADJUST, - [uint32, - uint32]}, - - {ssh_msg_channel_data, ?SSH_MSG_CHANNEL_DATA, - [uint32, - binary]}, - - {ssh_msg_channel_extended_data, ?SSH_MSG_CHANNEL_EXTENDED_DATA, - [uint32, - uint32, - binary]}, - - {ssh_msg_channel_eof, ?SSH_MSG_CHANNEL_EOF, - [uint32]}, - - {ssh_msg_channel_close, ?SSH_MSG_CHANNEL_CLOSE, - [uint32]}, - - {ssh_msg_channel_request, ?SSH_MSG_CHANNEL_REQUEST, - [uint32, - string, - boolean, - '...']}, - - {ssh_msg_channel_success, ?SSH_MSG_CHANNEL_SUCCESS, - [uint32]}, - - {ssh_msg_channel_failure, ?SSH_MSG_CHANNEL_FAILURE, - [uint32]} - ]. - encode_ip(Addr) when is_tuple(Addr) -> case catch inet_parse:ntoa(Addr) of {'EXIT',_} -> false; @@ -960,19 +806,33 @@ encode_ip(Addr) when is_list(Addr) -> end end. -start_channel(Cb, Id, Args, SubSysSup) -> - start_channel(Cb, Id, Args, SubSysSup, undefined). +start_channel(Cb, Id, Args, SubSysSup, Opts) -> + start_channel(Cb, Id, Args, SubSysSup, undefined, Opts). -start_channel(Cb, Id, Args, SubSysSup, Exec) -> +start_channel(Cb, Id, Args, SubSysSup, Exec, Opts) -> ChildSpec = child_spec(Cb, Id, Args, Exec), - ChannelSup =ssh_subsystem_sup:channel_supervisor(SubSysSup), + ChannelSup = ssh_subsystem_sup:channel_supervisor(SubSysSup), + assert_limit_num_channels_not_exceeded(ChannelSup, Opts), ssh_channel_sup:start_child(ChannelSup, ChildSpec). +assert_limit_num_channels_not_exceeded(ChannelSup, Opts) -> + MaxNumChannels = proplists:get_value(max_channels, Opts, infinity), + NumChannels = length([x || {_,_,worker,[ssh_channel]} <- + supervisor:which_children(ChannelSup)]), + if + %% Note that NumChannels is BEFORE starting a new one + NumChannels < MaxNumChannels -> + ok; + true -> + throw(max_num_channels_exceeded) + end. + %%-------------------------------------------------------------------- %%% Internal functions %%-------------------------------------------------------------------- -setup_session(#connection{channel_cache = Cache} = Connection0, - ConnectionPid, RemoteId, +setup_session(#connection{channel_cache = Cache + } = Connection0, + RemoteId, Type, WindowSize, PacketSize) -> {ChannelId, Connection} = new_channel_id(Connection0), @@ -983,6 +843,7 @@ setup_session(#connection{channel_cache = Cache} = Connection0, recv_packet_size = ?DEFAULT_PACKET_SIZE, send_window_size = WindowSize, send_packet_size = PacketSize, + send_buf = queue:new(), remote_id = RemoteId }, ssh_channel:cache_update(Cache, Channel), @@ -990,7 +851,7 @@ setup_session(#connection{channel_cache = Cache} = Connection0, ?DEFAULT_WINDOW_SIZE, ?DEFAULT_PACKET_SIZE), - {{replies, [{connection_reply, ConnectionPid, OpenConfMsg}]}, Connection}. + {{replies, [{connection_reply, OpenConfMsg}]}, Connection}. check_subsystem("sftp"= SsName, Options) -> @@ -1019,35 +880,23 @@ child_spec(Callback, Id, Args, Exec) -> Type = worker, {Name, StartFunc, Restart, Shutdown, Type, [ssh_channel]}. -%% Backwards compatibility -start_cli(#connection{address = Address, port = Port, cli_spec = {Fun, [Shell]}, - options = Options}, - _ChannelId) when is_function(Fun) -> - case Fun(Shell, Address, Port, Options) of - NewFun when is_function(NewFun) -> - {ok, NewFun()}; - Pid when is_pid(Pid) -> - {ok, Pid} - end; - -start_cli(#connection{cli_spec = {CbModule, Args}, exec = Exec, +start_cli(#connection{cli_spec = no_cli}, _) -> + {error, cli_disabled}; +start_cli(#connection{options = Options, + cli_spec = {CbModule, Args}, + exec = Exec, sub_system_supervisor = SubSysSup}, ChannelId) -> - start_channel(CbModule, ChannelId, Args, SubSysSup, Exec). + start_channel(CbModule, ChannelId, Args, SubSysSup, Exec, Options). -start_subsytem(BinName, #connection{address = Address, port = Port, - options = Options, +start_subsystem(BinName, #connection{options = Options, sub_system_supervisor = SubSysSup}, - #channel{local_id = ChannelId, remote_id = RemoteChannelId}, - ReplyMsg) -> + #channel{local_id = ChannelId}, _ReplyMsg) -> Name = binary_to_list(BinName), case check_subsystem(Name, Options) of {Callback, Opts} when is_atom(Callback), Callback =/= none -> - start_channel(Callback, ChannelId, Opts, SubSysSup); + start_channel(Callback, ChannelId, Opts, SubSysSup, Options); {Other, _} when Other =/= none -> - handle_backwards_compatibility(Other, self(), - ChannelId, RemoteChannelId, - Options, Address, Port, - {ssh_cm, self(), ReplyMsg}) + {error, legacy_option_not_supported} end. channel_data_reply(_, #channel{local_id = ChannelId} = Channel, @@ -1070,80 +919,118 @@ reply_msg(Channel, Connection, failure = Reply) -> request_reply_or_data(Channel, Connection, Reply); reply_msg(Channel, Connection, {closed, _} = Reply) -> request_reply_or_data(Channel, Connection, Reply); +reply_msg(undefined, Connection, _Reply) -> + {noreply, Connection}; reply_msg(#channel{user = ChannelPid}, Connection, Reply) -> {{channel_data, ChannelPid, Reply}, Connection}. + request_reply_or_data(#channel{local_id = ChannelId, user = ChannelPid}, #connection{requests = Requests} = Connection, Reply) -> case lists:keysearch(ChannelId, 1, Requests) of {value, {ChannelId, From}} -> - {{channel_requst_reply, From, Reply}, + {{channel_request_reply, From, Reply}, Connection#connection{requests = - lists:keydelete(ChannelId, 1, Requests)}}; + lists:keydelete(ChannelId, 1, Requests)}}; + false when (Reply == success) or (Reply == failure) -> + {[], Connection}; false -> {{channel_data, ChannelPid, Reply}, Connection} end. + update_send_window(Channel, _, undefined, #connection{channel_cache = Cache}) -> - do_update_send_window(Channel, Channel#channel.send_buf, Cache); + do_update_send_window(Channel, Cache); -update_send_window(Channel, DataType, Data, +update_send_window(#channel{send_buf = SendBuffer} = Channel, DataType, Data, #connection{channel_cache = Cache}) -> - do_update_send_window(Channel, Channel#channel.send_buf ++ [{DataType, Data}], Cache). - -do_update_send_window(Channel0, Buf0, Cache) -> - {Buf1, NewSz, Buf2} = get_window(Buf0, - Channel0#channel.send_packet_size, - Channel0#channel.send_window_size), + do_update_send_window(Channel#channel{send_buf = queue:in({DataType, Data}, SendBuffer)}, + Cache). - Channel = Channel0#channel{send_window_size = NewSz, send_buf = Buf2}, +do_update_send_window(Channel0, Cache) -> + {SendMsgs, Channel} = get_window(Channel0, []), ssh_channel:cache_update(Cache, Channel), - {Buf1, Channel}. - -get_window(Bs, PSz, WSz) -> - get_window(Bs, PSz, WSz, []). - -get_window(Bs, _PSz, 0, Acc) -> - {lists:reverse(Acc), 0, Bs}; -get_window([B0 = {DataType, Bin} | Bs], PSz, WSz, Acc) -> - BSz = size(Bin), - if BSz =< WSz -> %% will fit into window - if BSz =< PSz -> %% will fit into a packet - get_window(Bs, PSz, WSz-BSz, [B0|Acc]); - true -> %% split into packet size - <<Bin1:PSz/binary, Bin2/binary>> = Bin, - get_window([setelement(2, B0, Bin2) | Bs], - PSz, WSz-PSz, - [{DataType, Bin1}|Acc]) + {SendMsgs, Channel}. + +get_window(#channel{send_window_size = 0 + } = Channel, Acc) -> + {lists:reverse(Acc), Channel}; +get_window(#channel{send_packet_size = 0 + } = Channel, Acc) -> + {lists:reverse(Acc), Channel}; +get_window(#channel{send_buf = Buffer, + send_packet_size = PacketSize, + send_window_size = WindowSize0 + } = Channel, Acc0) -> + case queue:out(Buffer) of + {{value, {_, Data} = Msg}, NewBuffer} -> + case handle_send_window(Msg, size(Data), PacketSize, WindowSize0, Acc0) of + {WindowSize, Acc, {_, <<>>}} -> + {lists:reverse(Acc), Channel#channel{send_window_size = WindowSize, + send_buf = NewBuffer}}; + {WindowSize, Acc, Rest} -> + get_window(Channel#channel{send_window_size = WindowSize, + send_buf = queue:in_r(Rest, NewBuffer)}, Acc) end; - WSz =< PSz -> %% use rest of window - <<Bin1:WSz/binary, Bin2/binary>> = Bin, - get_window([setelement(2, B0, Bin2) | Bs], - PSz, WSz-WSz, - [{DataType, Bin1}|Acc]); - true -> %% use packet size - <<Bin1:PSz/binary, Bin2/binary>> = Bin, - get_window([setelement(2, B0, Bin2) | Bs], - PSz, WSz-PSz, - [{DataType, Bin1}|Acc]) + {empty, NewBuffer} -> + {[], Channel#channel{send_buf = NewBuffer}} + end. + +handle_send_window(Msg = {Type, Data}, Size, PacketSize, WindowSize, Acc) when Size =< WindowSize -> + case Size =< PacketSize of + true -> + {WindowSize - Size, [Msg | Acc], {Type, <<>>}}; + false -> + <<Msg1:PacketSize/binary, Msg2/binary>> = Data, + {WindowSize - PacketSize, [{Type, Msg1} | Acc], {Type, Msg2}} end; -get_window([], _PSz, WSz, Acc) -> - {lists:reverse(Acc), WSz, []}. +handle_send_window({Type, Data}, _, PacketSize, WindowSize, Acc) when WindowSize =< PacketSize -> + <<Msg1:WindowSize/binary, Msg2/binary>> = Data, + {WindowSize - WindowSize, [{Type, Msg1} | Acc], {Type, Msg2}}; +handle_send_window({Type, Data}, _, PacketSize, WindowSize, Acc) -> + <<Msg1:PacketSize/binary, Msg2/binary>> = Data, + {WindowSize - PacketSize, [{Type, Msg1} | Acc], {Type, Msg2}}. flow_control(Channel, Cache) -> flow_control([window_adjusted], Channel, Cache). - + flow_control([], Channel, Cache) -> ssh_channel:cache_update(Cache, Channel), []; - flow_control([_|_], #channel{flow_control = From, - send_buf = []} = Channel, Cache) when From =/= undefined -> - [{flow_control, Cache, Channel, From, ok}]; + send_buf = Buffer} = Channel, Cache) when From =/= undefined -> + case queue:is_empty(Buffer) of + true -> + ssh_channel:cache_update(Cache, Channel#channel{flow_control = undefined}), + [{flow_control, Cache, Channel, From, ok}]; + false -> + [] + end; flow_control(_,_,_) -> - []. + []. +pty_req(ConnectionHandler, Channel, Term, Width, Height, + PixWidth, PixHeight, PtyOpts, TimeOut) -> + ssh_connection_handler:request(ConnectionHandler, + Channel, "pty-req", true, + [?string(Term), + ?uint32(Width), ?uint32(Height), + ?uint32(PixWidth),?uint32(PixHeight), + encode_pty_opts(PtyOpts)], TimeOut). + +pty_default_dimensions(Dimension, Options) -> + case proplists:get_value(Dimension, Options, 0) of + N when is_integer(N), N > 0 -> + {N, 0}; + _ -> + case proplists:get_value(list_to_atom("pixel_" ++ atom_to_list(Dimension)), Options, 0) of + N when is_integer(N), N > 0 -> + {0, N}; + _ -> + {?TERMINAL_WIDTH, 0} + end + end. encode_pty_opts(Opts) -> Bin = list_to_binary(encode_pty_opts2(Opts)), @@ -1335,49 +1222,12 @@ decode_pty_opts2(<<Code, ?UINT32(Value), Tail/binary>>) -> end, [{Op, Value} | decode_pty_opts2(Tail)]. -decode_ip(Addr) when is_binary(Addr) -> - case inet_parse:address(binary_to_list(Addr)) of - {error,_} -> Addr; - {ok,A} -> A - end. -%% This is really awful and that is why it is beeing phased out. -handle_backwards_compatibility({_,_,_,_,_,_} = ChildSpec, _, _, _, _, - Address, Port, _) -> - SystemSup = ssh_system_sup:system_supervisor(Address, Port), - ChannelSup = ssh_system_sup:channel_supervisor(SystemSup), - ssh_channel_sup:start_child(ChannelSup, ChildSpec); - -handle_backwards_compatibility(Module, ConnectionManager, ChannelId, - RemoteChannelId, Opts, - _, _, Msg) when is_atom(Module) -> - {ok, SubSystemPid} = gen_server:start_link(Module, [Opts], []), - SubSystemPid ! - {ssh_cm, ConnectionManager, - {open, ChannelId, RemoteChannelId, {session}}}, - SubSystemPid ! Msg, - {ok, SubSystemPid}; - -handle_backwards_compatibility(Fun, ConnectionManager, ChannelId, - RemoteChannelId, - _, _, _, Msg) when is_function(Fun) -> - SubSystemPid = Fun(), - SubSystemPid ! - {ssh_cm, ConnectionManager, - {open, ChannelId, RemoteChannelId, {session}}}, - SubSystemPid ! Msg, - {ok, SubSystemPid}; - -handle_backwards_compatibility(ChildSpec, - ConnectionManager, - ChannelId, RemoteChannelId, _, - Address, Port, Msg) -> - SystemSup = ssh_system_sup:system_supervisor(Address, Port), - ChannelSup = ssh_system_sup:channel_supervisor(SystemSup), - {ok, SubSystemPid} - = ssh_channel_sup:start_child(ChannelSup, ChildSpec), - SubSystemPid ! - {ssh_cm, ConnectionManager, - {open, ChannelId, RemoteChannelId, {session}}}, - SubSystemPid ! Msg, - {ok, SubSystemPid}. +backwards_compatible([], Acc) -> + Acc; +backwards_compatible([{hight, Value} | Rest], Acc) -> + backwards_compatible(Rest, [{height, Value} | Acc]); +backwards_compatible([{pixel_hight, Value} | Rest], Acc) -> + backwards_compatible(Rest, [{height, Value} | Acc]); +backwards_compatible([Value| Rest], Acc) -> + backwards_compatible(Rest, [ Value | Acc]). |