Merge branch 'hans/ssh/channel_testsuite/OTP-15051'

* hans/ssh/channel_testsuite/OTP-15051:
  ssh: Channel testsuite

10 files changed, 446 insertions, 0 deletions

diff --git a/lib/ssh/test/Makefile b/lib/ssh/test/Makefile
index 0a99d31a63..9832a9b210 100644
--- a/lib/ssh/test/Makefile
+++ b/lib/ssh/test/Makefile
@@ -36,6 +36,7 @@ MODULES= \
 	ssh_options_SUITE \
 	ssh_basic_SUITE \
 	ssh_bench_SUITE \
+	ssh_chan_behaviours_SUITE \
 	ssh_compat_SUITE \
 	ssh_connection_SUITE \
 	ssh_dbg_SUITE \
@@ -53,6 +54,8 @@ MODULES= \
 	ssh_key_cb_options \
 	ssh_key_cb_engine_keys \
 	ssh_trpt_test_lib \
+	ssh_chan_behaviours_client \
+	ssh_chan_behaviours_server \
 	ssh_echo_server \
 	ssh_bench_dev_null \
 	ssh_peername_sockname_server \
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE.erl b/lib/ssh/test/ssh_chan_behaviours_SUITE.erl
new file mode 100644
index 0000000000..16ed152bcd
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE.erl
@@ -0,0 +1,152 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018-2018. 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%
+%%
+
+%%
+
+-module(ssh_chan_behaviours_SUITE).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("ssh/src/ssh.hrl").
+-include("ssh_test_lib.hrl").
+
+%% Note: This directive should only be used in test suites.
+-compile(export_all).
+
+%%--------------------------------------------------------------------
+%% Common Test interface functions -----------------------------------
+%%--------------------------------------------------------------------
+
+suite() ->
+    [{ct_hooks,[ts_install_cth]},
+     {timetrap,{seconds,60}}].
+
+all() -> 
+    [
+     noexist_subsystem,
+     undefined_subsystem,
+     defined_subsystem,
+     subsystem_client
+    ].
+
+%%--------------------------------------------------------------------
+init_per_suite(Config) ->
+    ?CHECK_CRYPTO(
+       begin
+           ssh:start(),
+           Config
+       end).
+
+end_per_suite(_Config) ->
+    {Time,R} = timer:tc(ssh, stop, []),
+    ct:log("Stop ssh: ~p ms",[(100*(Time div 1000)) / 100]),
+    R.
+
+init_per_testcase(_TC, Config) ->
+    SubSystems = [
+                  {"bad_cb", {ssh_chan_behaviours_undefined, []}}, % A non-existing file
+                  {"ch1",    {ssh_chan_behaviours_server,    [self(),true]}}
+                 ],
+    {Pid, Host, Port} = ssh_test_lib:std_daemon(Config, [{subsystems,SubSystems}]),
+    C = ssh_test_lib:std_connect(Config, Host, Port, []),
+    [{connref,C}, {daemon_pid,Pid}| Config].
+
+end_per_testcase(_TC, Config) ->
+    {Time,_} = timer:tc(ssh, stop_daemon, [proplists:get_value(daemon_pid,Config)]),
+    ct:log("Stop daemon: ~p ms",[(100*(Time div 1000)) / 100]),
+    case flush() of
+        [] -> ok;
+        Msgs -> ct:pal("Unhandled messages:~n~p", [Msgs])
+    end.
+    
+
+-define(EXPECT(What, Bind),
+        Bind =
+            (fun() ->
+                     receive What ->
+                             ct:log("~p:~p ~p got ~p",[?MODULE,?LINE,self(),What]),
+                             Bind
+                     after 5000 ->
+                             ct:log("~p:~p ~p Flushed:~n~p",[?MODULE,?LINE,self(),flush()]),
+                             ct:fail("Timeout!",[])
+                     end
+             end)()
+        ).
+
+%%--------------------------------------------------------------------
+%% Test Cases --------------------------------------------------------
+%%--------------------------------------------------------------------
+%% Try start a subsystem whos name is not known by the server
+noexist_subsystem(Config) ->
+    C = proplists:get_value(connref, Config),
+    {ok, Ch} = ssh_connection:session_channel(C, infinity),
+    failure = ssh_connection:subsystem(C, Ch, "noexist", infinity),
+    ok = ssh_connection:close(C, Ch),
+    ?EXPECT({ssh_cm,C,{closed,Ch}},[]),
+    ok.
+
+%% Try to start a subsystem with a known name, but without any callback file
+undefined_subsystem(Config) ->
+    C = proplists:get_value(connref, Config),
+    {ok, Ch} = ssh_connection:session_channel(C, infinity),
+    failure = ssh_connection:subsystem(C, Ch, "bad_cb", infinity),
+    ok = ssh_connection:close(C, Ch),
+    ?EXPECT({ssh_cm,C,{closed,Ch}},[]), % self() is instead of a proper channel handler
+    ok.
+
+%% Try to start and stop a subsystem with known name and defined callback file
+defined_subsystem(Config) ->
+    C = proplists:get_value(connref, Config),
+    {ok, Ch1} = ssh_connection:session_channel(C, infinity),
+
+    success = ssh_connection:subsystem(C, Ch1, "ch1", infinity),
+    IDsrv = ?EXPECT({{_Csrv,_Ch1srv}, {ssh_channel_up,_Ch1srv,_Csrv}}, {_Csrv,_Ch1srv}),
+
+    ok = ssh_connection:close(C, Ch1),
+    ?EXPECT({IDsrv, {terminate,normal}}, []),
+    ?EXPECT({ssh_cm, C, {closed,Ch1}}, []), % self() is instead of a proper channel handler
+    ok.
+
+%% Try to start and stop a subsystem from a ssh_client_channel behviour
+subsystem_client(Config) ->
+    C = proplists:get_value(connref, Config),
+
+    {ok,ChRef} = ssh_chan_behaviours_client:start_link(C),
+    IDclt = ?EXPECT({{C,Ch1clt},     {ssh_channel_up,Ch1clt,C}},     {C,Ch1clt}),
+    IDsrv = ?EXPECT({{_Csrv,Ch1srv}, {ssh_channel_up,Ch1srv,_Csrv}}, {_Csrv,Ch1srv}),
+
+    ok = ssh_chan_behaviours_client:stop(ChRef),
+    ?EXPECT({IDclt, {terminate,normal}}, []), % From the proper channel handler
+    ?EXPECT({IDsrv, {terminate,normal}}, []),
+    ok.
+
+%%%================================================================
+%%%
+%%%
+
+flush() -> lists:reverse(flush([])).
+
+flush(Acc) ->
+    receive
+        M ->
+            flush([M|Acc])
+    after 0 ->
+            Acc
+    end.
+            
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key
new file mode 100644
index 0000000000..51ab6fbd88
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key
@@ -0,0 +1,13 @@
+-----BEGIN DSA PRIVATE KEY-----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+-----END DSA PRIVATE KEY-----
+
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key.pub b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key.pub
new file mode 100644
index 0000000000..4dbb1305b0
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_dsa_key.pub
@@ -0,0 +1,11 @@
+---- BEGIN SSH2 PUBLIC KEY ----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+---- END SSH2 PUBLIC KEY ----
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key
new file mode 100644
index 0000000000..fb1a862ded
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key
@@ -0,0 +1,6 @@
+-----BEGIN EC PRIVATE KEY-----
+MIGkAgEBBDArxbDfh3p1okrD9wQw6jJ4d4DdlBPD5GqXE8bIeRJiK41Sh40LgvPw
+mkqEDSXK++CgBwYFK4EEACKhZANiAAScl43Ih2lWTDKrSox5ve5uiTXil4smsup3
+CfS1XPjKxgBAmlfBim8izbdrT0BFdQzz2joduNMtpt61wO4rGs6jm0UP7Kim9PC7
+Hneb/99fIYopdMH5NMnk60zGO1uZ2vc=
+-----END EC PRIVATE KEY-----
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key.pub b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key.pub
new file mode 100644
index 0000000000..428d5fb7d7
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_ecdsa_key.pub
@@ -0,0 +1 @@
+ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBJyXjciHaVZMMqtKjHm97m6JNeKXiyay6ncJ9LVc+MrGAECaV8GKbyLNt2tPQEV1DPPaOh240y2m3rXA7isazqObRQ/sqKb08Lsed5v/318hiil0wfk0yeTrTMY7W5na9w== uabhnil@elxadlj3q32
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key
new file mode 100644
index 0000000000..79968bdd7d
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key
@@ -0,0 +1,16 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+
diff --git a/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key.pub b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key.pub
new file mode 100644
index 0000000000..75d2025c71
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_SUITE_data/ssh_host_rsa_key.pub
@@ -0,0 +1,5 @@
+---- BEGIN SSH2 PUBLIC KEY ----
+AAAAB3NzaC1yc2EAAAADAQABAAAAgQDCZX+4FBDwZIh9y/Uxee1VJnEXlowpz2yDKwj8
+semM4q843337zbNfxHmladB1lpz2NqyxI175xMIJuDxogyZdsOxGnFAzAnthR4dqL/RW
+RWzjaxSB6IAO9SPYVVlrpZ+1hsjLW79fwXK/yc8VdhRuWTeQiRgYY2ek8+OKbOqz4Q==
+---- END SSH2 PUBLIC KEY ----
diff --git a/lib/ssh/test/ssh_chan_behaviours_client.erl b/lib/ssh/test/ssh_chan_behaviours_client.erl
new file mode 100644
index 0000000000..07ac21ba97
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_client.erl
@@ -0,0 +1,143 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2005-2016. 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 client
+-module(ssh_chan_behaviours_client).
+-behaviour(ssh_client_channel).
+-record(state, {
+          parent,
+          cm,
+          ch,
+          dbg
+         }).
+-export([start_link/1, start/1,
+         stop/1, send_eof/1,
+         init/1, handle_msg/2, handle_ssh_msg/2, terminate/2,
+         code_change/3, handle_call/3, handle_cast/2
+        ]).
+
+-define(DBG(State,Fmt,Args),
+        case State#state.dbg of
+            true -> ct:log("~p:~p ~p C=~p Ch=~p "++Fmt,
+                           [?MODULE,?LINE,self(),State#state.cm,State#state.ch|Args]);
+            false -> ok
+        end).
+
+
+start_link(C) ->
+    {ok, Ch} = ssh_connection:session_channel(C, infinity),
+    ssh_client_channel:start_link(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).
+
+start(C) ->
+    {ok, Ch} = ssh_connection:session_channel(C, infinity),
+    ssh_client_channel:start(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).
+
+send_eof(ChRef) ->
+    ssh_client_channel:call(ChRef, send_eof).
+
+stop(ChRef) ->
+    ssh_client_channel:call(ChRef, stop).
+
+
+init([C, Ch, Parent, Dbg|_Exec]) ->
+    case ssh_connection:subsystem(C, Ch, "ch1", infinity) of
+        success ->
+            State = #state{cm = C,
+                           ch = Ch,
+                           parent=Parent,
+                           dbg=Dbg},
+            ?DBG(State, "callback spawned, parent = ~p", [Parent]),
+            {ok, State};
+
+        Other ->
+            {stop, Other}
+    end.
+
+handle_msg({ssh_channel_up, ChannelId, ConnectionManager}=M, State0) ->
+    State = State0#state{cm = ConnectionManager,
+                         ch = ChannelId},
+    tell_parent(M, State),
+    ?DBG(State, "ssh_channel_up",[]),
+    {ok, State}.
+
+handle_ssh_msg({ssh_cm, C, {data, Ch, 0, Data}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "ssh_cm data size(Data)=~p",[size(Data)]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {data, Ch, Type, Data}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "ssh_cm data Type=~p : ~p",[Type,Data]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {eof, Ch}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "eof",[]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {signal, _Ch, _SigNameStr}=Sig} = M, #state{ch=Ch,cm=C} = State) ->
+    %% Ignore signals according to RFC 4254 section 6.9.
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {exit_signal, Ch, _, _Error, _}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {stop, Ch, State};
+
+handle_ssh_msg({ssh_cm, C, {exit_status, Ch, _Status}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {stop, Ch, State}.
+
+
+handle_call(send_eof, _From,#state{ch=Ch,cm=C} =  State) ->
+    {reply, ssh_connection:send_eof(C,Ch), State};
+
+handle_call(stop, _From, State) ->
+    {stop, normal, ok, State};
+
+handle_call(Msg, _From, State) ->
+    ?DBG(State, "Unknown call ~p", [Msg]),
+    {reply, {unknown_call,Msg}, State}.
+
+
+terminate(Reason, State) ->
+    tell_parent({terminate,Reason}, State),
+    ?DBG(State, "terminate Reason = ~p",[Reason]).
+
+
+handle_cast(Msg, State) -> 
+    ?DBG(State, "Unknown cast ~p", [Msg]),
+    {noreply, State}.
+
+code_change(_OldVsn, State, _Extra) -> {ok, State}.
+
+%%%================================================================
+%%%
+%%%
+
+tell_parent(Msg, #state{parent = Parent,
+                        cm = C,
+                        ch = Ch}) -> Parent ! {{C,Ch}, Msg}.
+
diff --git a/lib/ssh/test/ssh_chan_behaviours_server.erl b/lib/ssh/test/ssh_chan_behaviours_server.erl
new file mode 100644
index 0000000000..a5ec19e0cf
--- /dev/null
+++ b/lib/ssh/test/ssh_chan_behaviours_server.erl
@@ -0,0 +1,96 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2005-2016. 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_chan_behaviours_server).
+-behaviour(ssh_server_channel).
+-record(state, {
+          parent,
+          cm,
+          ch,
+          dbg
+	 }).
+-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 C=~p Ch=~p "++Fmt,
+                           [?MODULE,?LINE,self(),State#state.cm,State#state.ch|Args]);
+	    false -> ok
+	end).
+
+
+init([Pid,Dbg|_Exec]) ->
+    {ok, #state{parent=Pid,
+                dbg=Dbg}}.
+
+handle_msg({ssh_channel_up, ChannelId, ConnectionManager}=M, State0) ->
+    State = State0#state{cm = ConnectionManager,
+                         ch = ChannelId},
+    tell_parent(M, State),
+    ?DBG(State, "ssh_channel_up",[]),
+    {ok, State}.
+
+handle_ssh_msg({ssh_cm, C, {data, Ch, 0, Data}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "ssh_cm data size(Data)=~p",[size(Data)]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {data, Ch, Type, Data}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "ssh_cm data Type=~p : ~p",[Type,Data]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {eof, Ch}}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "eof",[]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {signal, _Ch, _SigNameStr}=Sig} = M, #state{ch=Ch,cm=C} = State) ->
+    %% Ignore signals according to RFC 4254 section 6.9.
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {ok, State};
+
+handle_ssh_msg({ssh_cm, C, {exit_signal, Ch, _, _Error, _}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {stop, Ch, State};
+
+handle_ssh_msg({ssh_cm, C, {exit_status, Ch, _Status}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
+    tell_parent(M, State),
+    ?DBG(State, "~p",[Sig]),
+    {stop, Ch, State}.
+
+terminate(Reason, State) ->
+    tell_parent({terminate,Reason}, State),
+    ?DBG(State, "terminate Reason = ~p",[Reason]),
+    ok.
+
+%%%================================================================
+%%%
+%%%
+
+tell_parent(Msg, #state{parent = Parent,
+                        cm = C,
+                        ch = Ch}) -> Parent ! {{C,Ch}, Msg}.
+