%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2005-2018. All Rights Reserved.
%%
%% 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
%%
%% 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%
%%
%%
%%% Description: Example ssh server
-module(ssh_echo_server).
-behaviour(ssh_server_channel).
-record(state, {
n,
id,
cm,
dbg = false
}).
-export([init/1, handle_msg/2, handle_ssh_msg/2, terminate/2]).
-define(DBG(State,Fmt,Args),
case State#state.dbg of
true -> ct:log("~p:~p ~p "++Fmt, [?MODULE,?LINE,self()|Args]);
false -> ok
end).
init([N]) ->
{ok, #state{n = N}};
init([N,Opts]) ->
State = #state{n = N,
dbg = proplists:get_value(dbg,Opts,false)
},
?DBG(State, "init([~p])",[N]),
{ok, State}.
handle_msg({ssh_channel_up, ChannelId, ConnectionManager}, State) ->
?DBG(State, "ssh_channel_up Cid=~p ConnMngr=~p",[ChannelId,ConnectionManager]),
{ok, State#state{id = ChannelId,
cm = ConnectionManager}}.
handle_ssh_msg({ssh_cm, CM, {data, ChannelId, 0, Data}}, #state{n = N} = State) ->
M = N - size(Data),
case M > 0 of
true ->
?DBG(State, "ssh_cm data Cid=~p size(Data)=~p M=~p",[ChannelId,size(Data),M]),
ssh_connection:send(CM, ChannelId, Data),
{ok, State#state{n = M}};
false ->
<<SendData:N/binary, _/binary>> = Data,
?DBG(State, "ssh_cm data Cid=~p size(Data)=~p M=~p size(SendData)=~p~nSend eof",[ChannelId,size(Data),M,size(SendData)]),
ssh_connection:send(CM, ChannelId, SendData),
ssh_connection:send_eof(CM, ChannelId),
{stop, ChannelId, State}
end;
handle_ssh_msg({ssh_cm, _ConnectionManager,
{data, _ChannelId, 1, Data}}, State) ->
?DBG(State, "stderr: ~p",[Data]),
error_logger:format(standard_error, " ~p~n", [binary_to_list(Data)]),
{ok, State};
handle_ssh_msg({ssh_cm, _ConnectionManager, {eof, _ChannelId}}, State) ->
?DBG(State, "{eof ~p}",[_ChannelId]),
{ok, State};
handle_ssh_msg({ssh_cm, _, _Sig={signal, _, _}}, State) ->
%% Ignore signals according to RFC 4254 section 6.9.
?DBG(State, "~p",[_Sig]),
{ok, State};
handle_ssh_msg({ssh_cm, _, _Sig={exit_signal, ChannelId, _, _Error, _}}, State) ->
?DBG(State, "~p",[_Sig]),
{stop, ChannelId, State};
handle_ssh_msg({ssh_cm, _, _Sig={exit_status, ChannelId, _Status}}, State) ->
?DBG(State, "~p",[_Sig]),
{stop, ChannelId, State}.
terminate(_Reason, _State) ->
?DBG(_State, "terminate ~p",[_Reason]),
ok.
