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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2017. 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 top supervisor for ssh servers hangs under
%% ssh_sup.
%%----------------------------------------------------------------------
-module(sshd_sup).
-behaviour(supervisor).
-include("ssh.hrl").
-export([start_link/0,
start_child/4,
stop_child/1,
stop_child/3
]).
%% Supervisor callback
-export([init/1]).
-define(SSHD_SUP, ?MODULE).
%%%=========================================================================
%%% API
%%%=========================================================================
start_link() ->
%% No children are start now. We wait until the user calls ssh:daemon
%% and uses start_child/4 to create the children
supervisor:start_link({local,?SSHD_SUP}, ?MODULE, []).
start_child(Address, Port, Profile, Options) ->
case ssh_system_sup:system_supervisor(Address, Port, Profile) of
undefined ->
%% Here we start listening on a new Host/Port/Profile
Spec = child_spec(Address, Port, Profile, Options),
supervisor:start_child(?SSHD_SUP, Spec);
Pid ->
%% Here we resume listening on a new Host/Port/Profile after
%% haveing stopped listening to he same with ssh:stop_listen(Pid)
AccPid = ssh_system_sup:acceptor_supervisor(Pid),
ssh_acceptor_sup:start_child(AccPid, Address, Port, Profile, Options),
{ok,Pid}
end.
stop_child(ChildId) when is_tuple(ChildId) ->
supervisor:terminate_child(?SSHD_SUP, ChildId);
stop_child(ChildPid) when is_pid(ChildPid)->
stop_child(system_name(ChildPid)).
stop_child(Address, Port, Profile) ->
Id = id(Address, Port, Profile),
stop_child(Id).
%%%=========================================================================
%%% Supervisor callback
%%%=========================================================================
init(_) ->
SupFlags = #{strategy => one_for_one,
intensity => 10,
period => 3600
},
ChildSpecs = [
],
{ok, {SupFlags,ChildSpecs}}.
%%%=========================================================================
%%% Internal functions
%%%=========================================================================
child_spec(Address, Port, Profile, Options) ->
#{id => id(Address, Port, Profile),
start => {ssh_system_sup, start_link, [Address, Port, Profile, Options]},
restart => temporary,
shutdown => infinity,
type => supervisor,
modules => [ssh_system_sup]
}.
id(Address, Port, Profile) ->
{server, ssh_system_sup, Address, Port, Profile}.
system_name(SysSup) ->
case lists:keyfind(SysSup, 2, supervisor:which_children(?SSHD_SUP)) of
{Name, SysSup, _, _} -> Name;
false -> undefind
end.
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