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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2021. 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%
%%
%%
%%----------------------------------------------------------------------
%% Purpose: The ssh subsystem supervisor
%%----------------------------------------------------------------------
-module(ssh_subsystem_sup).
-behaviour(supervisor).
-include("ssh.hrl").
-export([start_link/5,
start_channel/8,
tcpip_fwd_supervisor/1
]).
%% Supervisor callback
-export([init/1]).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link(Role, Address=#address{}, Id, Socket, Options) ->
case supervisor:start_link(?MODULE, [Role, Address, Id, Socket, Options]) of
{error, {shutdown, {failed_to_start_child, _, Error}}} ->
{error,Error};
Other ->
Other
end.
start_channel(Role, SupPid, ConnRef, Callback, Id, Args, Exec, Opts) ->
ChannelSup = channel_supervisor(SupPid),
ssh_channel_sup:start_child(Role, ChannelSup, ConnRef, Callback, Id, Args, Exec, Opts).
tcpip_fwd_supervisor(SubSysSup) ->
find_child(tcpip_forward_acceptor_sup, SubSysSup).
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init([Role, Address, Id, Socket, Options]) ->
SubSysSup = self(),
SupFlags = #{strategy => one_for_all,
auto_shutdown => any_significant,
intensity => 0,
period => 3600
},
ChildSpecs = [#{id => connection,
restart => temporary,
type => worker,
significant => true,
start => {ssh_connection_handler,
start_link,
[Role, Address, Id, Socket,
?PUT_INTERNAL_OPT([
{subsystem_sup, SubSysSup}
], Options)
]
}
},
#{id => channel_sup,
restart => temporary,
type => supervisor,
start => {ssh_channel_sup, start_link, [Options]}
},
#{id => tcpip_forward_acceptor_sup,
restart => temporary,
type => supervisor,
start => {ssh_tcpip_forward_acceptor_sup, start_link, []}
}
],
{ok, {SupFlags,ChildSpecs}}.
%%%=========================================================================
%%% Internal functions
%%%=========================================================================
channel_supervisor(SubSysSup) -> find_child(channel_sup, SubSysSup).
find_child(Id, Sup) when is_pid(Sup) ->
try
{Id, Pid, _, _} = lists:keyfind(Id, 1, supervisor:which_children(Sup)),
Pid
catch
exit:{no_proc,_} ->
{error, no_proc};
_:_ ->
{error, {id_not_found,?MODULE,Id}}
end.
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