%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2016. 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%
%%
%%
-module(ssh).
-include("ssh.hrl").
-include("ssh_connect.hrl").
-include_lib("public_key/include/public_key.hrl").
-include_lib("kernel/include/file.hrl").
-export([start/0, start/1, stop/0,
connect/2, connect/3, connect/4,
close/1, connection_info/2,
channel_info/3,
daemon/1, daemon/2, daemon/3,
daemon_info/1,
default_algorithms/0,
stop_listener/1, stop_listener/2, stop_listener/3,
stop_daemon/1, stop_daemon/2, stop_daemon/3,
shell/1, shell/2, shell/3
]).
%%% Type exports
-export_type([ssh_daemon_ref/0,
ssh_connection_ref/0,
ssh_channel_id/0,
role/0,
subsystem_spec/0,
subsystem_name/0,
channel_callback/0,
channel_init_args/0,
algs_list/0,
alg_entry/0,
simple_algs/0,
double_algs/0
]).
-opaque ssh_daemon_ref() :: daemon_ref() .
-opaque ssh_connection_ref() :: connection_ref() .
-opaque ssh_channel_id() :: channel_id().
%%--------------------------------------------------------------------
-spec start() -> ok | {error, term()}.
-spec start(permanent | transient | temporary) -> ok | {error, term()}.
%%
%% Description: Starts the ssh application. Default type
%% is temporary. see application(3)
%%--------------------------------------------------------------------
start() ->
start(temporary).
start(Type) ->
case application:ensure_all_started(ssh, Type) of
{ok, _} ->
ok;
Other ->
Other
end.
%%--------------------------------------------------------------------
-spec stop() -> ok | {error, term()}.
%%
%% Description: Stops the ssh application.
%%--------------------------------------------------------------------
stop() ->
application:stop(ssh).
%%--------------------------------------------------------------------
-spec connect(inet:socket(), proplists:proplist()) -> ok_error(connection_ref()).
-spec connect(inet:socket(), proplists:proplist(), timeout()) -> ok_error(connection_ref())
; (string(), inet:port_number(), proplists:proplist()) -> ok_error(connection_ref()).
-spec connect(string(), inet:port_number(), proplists:proplist(), timeout()) -> ok_error(connection_ref()).
%%
%% Description: Starts an ssh connection.
%%--------------------------------------------------------------------
connect(Socket, UserOptions) when is_port(Socket),
is_list(UserOptions) ->
connect(Socket, UserOptions, infinity).
connect(Socket, UserOptions, Timeout) when is_port(Socket),
is_list(UserOptions) ->
case ssh_options:handle_options(client, UserOptions) of
{error, Error} ->
{error, Error};
Options ->
case valid_socket_to_use(Socket, ?GET_OPT(transport,Options)) of
ok ->
{ok, {Host,_Port}} = inet:sockname(Socket),
Opts = ?PUT_INTERNAL_OPT([{user_pid,self()}, {host,fmt_host(Host)}], Options),
ssh_connection_handler:start_connection(client, Socket, Opts, Timeout);
{error,SockError} ->
{error,SockError}
end
end;
connect(Host, Port, UserOptions) when is_integer(Port),
Port>0,
is_list(UserOptions) ->
connect(Host, Port, UserOptions, infinity).
connect(Host, Port, UserOptions, Timeout) when is_integer(Port),
Port>0,
is_list(UserOptions) ->
case ssh_options:handle_options(client, UserOptions) of
{error, _Reason} = Error ->
Error;
Options ->
{_, Transport, _} = TransportOpts = ?GET_OPT(transport, Options),
ConnectionTimeout = ?GET_OPT(connect_timeout, Options),
SocketOpts = [{active,false} | ?GET_OPT(socket_options,Options)],
try Transport:connect(Host, Port, SocketOpts, ConnectionTimeout) of
{ok, Socket} ->
Opts = ?PUT_INTERNAL_OPT([{user_pid,self()}, {host,Host}], Options),
ssh_connection_handler:start_connection(client, Socket, Opts, Timeout);
{error, Reason} ->
{error, Reason}
catch
exit:{function_clause, _F} ->
io:format('function_clause ~p~n',[_F]),
{error, {options, {transport, TransportOpts}}};
exit:badarg ->
{error, {options, {socket_options, SocketOpts}}}
end
end.
%%--------------------------------------------------------------------
-spec close(pid()) -> ok.
%%
%% Description: Closes an ssh connection.
%%--------------------------------------------------------------------
close(ConnectionRef) ->
ssh_connection_handler:stop(ConnectionRef).
%%--------------------------------------------------------------------
-spec connection_info(pid(), [atom()]) -> [{atom(), term()}].
%%
%% Description: Retrieves information about a connection.
%%--------------------------------------------------------------------
connection_info(ConnectionRef, Options) ->
ssh_connection_handler:connection_info(ConnectionRef, Options).
%%--------------------------------------------------------------------
-spec channel_info(pid(), channel_id(), [atom()]) -> [{atom(), term()}].
%%
%% Description: Retrieves information about a connection.
%%--------------------------------------------------------------------
channel_info(ConnectionRef, ChannelId, Options) ->
ssh_connection_handler:channel_info(ConnectionRef, ChannelId, Options).
%%--------------------------------------------------------------------
-spec daemon(inet:port_number()) -> ok_error(daemon_ref()).
-spec daemon(inet:port_number()|inet:socket(), proplists:proplist()) -> ok_error(daemon_ref()).
-spec daemon(any | inet:ip_address(), inet:port_number(), proplists:proplist()) -> ok_error(daemon_ref())
;(socket, inet:socket(), proplists:proplist()) -> ok_error(daemon_ref())
.
%% Description: Starts a server listening for SSH connections
%% on the given port.
%%--------------------------------------------------------------------
daemon(Port) ->
daemon(Port, []).
daemon(Port, UserOptions) when is_integer(Port), Port >= 0 ->
daemon(any, Port, UserOptions);
daemon(Socket, UserOptions) when is_port(Socket) ->
daemon(socket, Socket, UserOptions).
daemon(Host0, Port, UserOptions0) ->
{Host, UserOptions} = handle_daemon_args(Host0, UserOptions0),
start_daemon(Host, Port, ssh_options:handle_options(server, UserOptions)).
%%--------------------------------------------------------------------
-spec daemon_info(daemon_ref()) -> ok_error( [{atom(), term()}] ).
daemon_info(Pid) ->
case catch ssh_system_sup:acceptor_supervisor(Pid) of
AsupPid when is_pid(AsupPid) ->
[{ListenAddr,Port,Profile}] =
[{LA,Prt,Prf} || {{ssh_acceptor_sup,LA,Prt,Prf},
_WorkerPid,worker,[ssh_acceptor]} <- supervisor:which_children(AsupPid)],
{ok, [{port,Port},
{listen_address,ListenAddr},
{profile,Profile}
]};
_ ->
{error,bad_daemon_ref}
end.
%%--------------------------------------------------------------------
-spec stop_listener(daemon_ref()) -> ok.
-spec stop_listener(inet:ip_address(), inet:port_number()) -> ok.
%%
%% Description: Stops the listener, but leaves
%% existing connections started by the listener up and running.
%%--------------------------------------------------------------------
stop_listener(SysSup) ->
ssh_system_sup:stop_listener(SysSup).
stop_listener(Address, Port) ->
stop_listener(Address, Port, ?DEFAULT_PROFILE).
stop_listener(Address, Port, Profile) ->
ssh_system_sup:stop_listener(Address, Port, Profile).
%%--------------------------------------------------------------------
-spec stop_daemon(daemon_ref()) -> ok.
-spec stop_daemon(inet:ip_address(), inet:port_number()) -> ok.
-spec stop_daemon(inet:ip_address(), inet:port_number(), atom()) -> ok.
%%
%% Description: Stops the listener and all connections started by
%% the listener.
%%--------------------------------------------------------------------
stop_daemon(SysSup) ->
ssh_system_sup:stop_system(SysSup).
stop_daemon(Address, Port) ->
ssh_system_sup:stop_system(Address, Port, ?DEFAULT_PROFILE).
stop_daemon(Address, Port, Profile) ->
ssh_system_sup:stop_system(Address, Port, Profile).
%%--------------------------------------------------------------------
-spec shell(inet:socket() | string()) -> _.
-spec shell(inet:socket() | string(), proplists:proplist()) -> _.
-spec shell(string(), inet:port_number(), proplists:proplist()) -> _.
%% Host = string()
%% Port = integer()
%% Options = [{Option, Value}]
%%
%% Description: Starts an interactive shell to an SSH server on the
%% given <Host>. The function waits for user input,
%% and will not return until the remote shell is ended.(e.g. on
%% exit from the shell)
%%--------------------------------------------------------------------
shell(Socket) when is_port(Socket) ->
shell(Socket, []);
shell(Host) ->
shell(Host, ?SSH_DEFAULT_PORT, []).
shell(Socket, Options) when is_port(Socket) ->
start_shell( connect(Socket, Options) );
shell(Host, Options) ->
shell(Host, ?SSH_DEFAULT_PORT, Options).
shell(Host, Port, Options) ->
start_shell( connect(Host, Port, Options) ).
start_shell({ok, ConnectionRef}) ->
case ssh_connection:session_channel(ConnectionRef, infinity) of
{ok,ChannelId} ->
success = ssh_connection:ptty_alloc(ConnectionRef, ChannelId, []),
Args = [{channel_cb, ssh_shell},
{init_args,[ConnectionRef, ChannelId]},
{cm, ConnectionRef}, {channel_id, ChannelId}],
{ok, State} = ssh_channel:init([Args]),
ssh_channel:enter_loop(State);
Error ->
Error
end;
start_shell(Error) ->
Error.
%%--------------------------------------------------------------------
-spec default_algorithms() -> algs_list() .
%%--------------------------------------------------------------------
default_algorithms() ->
ssh_transport:default_algorithms().
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
handle_daemon_args(Host, UserOptions0) ->
case Host of
socket ->
{Host, UserOptions0};
any ->
{ok, Host0} = inet:gethostname(),
Inet = proplists:get_value(inet, UserOptions0, inet),
{Host0, [Inet | UserOptions0]};
{_,_,_,_} ->
{Host, [inet, {ip,Host} | UserOptions0]};
{_,_,_,_,_,_,_,_} ->
{Host, [inet6, {ip,Host} | UserOptions0]};
_ ->
error(badarg)
end.
%%%----------------------------------------------------------------
valid_socket_to_use(Socket, {tcp,_,_}) ->
%% Is this tcp-socket a valid socket?
case {is_tcp_socket(Socket),
{ok,[{active,false}]} == inet:getopts(Socket, [active])
}
of
{true, true} ->
ok;
{true, false} ->
{error, not_passive_mode};
_ ->
{error, not_tcp_socket}
end;
valid_socket_to_use(_, {L4,_,_}) ->
{error, {unsupported,L4}}.
is_tcp_socket(Socket) ->
case inet:getopts(Socket, [delay_send]) of
{ok,[_]} -> true;
_ -> false
end.
%%%----------------------------------------------------------------
start_daemon(_, _, {error,Error}) ->
{error,Error};
start_daemon(socket, Socket, Options) ->
case valid_socket_to_use(Socket, ?GET_OPT(transport,Options)) of
ok ->
try
do_start_daemon(Socket, Options)
catch
throw:bad_fd -> {error,bad_fd};
throw:bad_socket -> {error,bad_socket};
_C:_E -> {error,{cannot_start_daemon,_C,_E}}
end;
{error,SockError} ->
{error,SockError}
end;
start_daemon(Host, Port, Options) ->
try
do_start_daemon(Host, Port, Options)
catch
throw:bad_fd -> {error,bad_fd};
throw:bad_socket -> {error,bad_socket};
_C:_E -> {error,{cannot_start_daemon,_C,_E}}
end.
do_start_daemon(Socket, Options) ->
{ok, {IP,Port}} =
try {ok,_} = inet:sockname(Socket)
catch
_:_ -> throw(bad_socket)
end,
Host = fmt_host(IP),
Opts = ?PUT_INTERNAL_OPT([{connected_socket, Socket},
{address, Host},
{port, Port},
{role, server}], Options),
Profile = ?GET_OPT(profile, Options),
case ssh_system_sup:system_supervisor(Host, Port, Profile) of
undefined ->
try sshd_sup:start_child(Opts) of
{error, {already_started, _}} ->
{error, eaddrinuse};
Result = {ok,_} ->
call_ssh_acceptor_handle_connection(Host, Port, Opts, Socket, Result);
Result = {error, _} ->
Result
catch
exit:{noproc, _} ->
{error, ssh_not_started}
end;
Sup ->
AccPid = ssh_system_sup:acceptor_supervisor(Sup),
case ssh_acceptor_sup:start_child(AccPid, Opts) of
{error, {already_started, _}} ->
{error, eaddrinuse};
{ok, _} ->
call_ssh_acceptor_handle_connection(Host, Port, Opts, Socket, {ok,Sup});
Other ->
Other
end
end.
do_start_daemon(Host0, Port0, Options0) ->
{Host,Port1} =
try
case ?GET_SOCKET_OPT(fd, Options0) of
undefined ->
{Host0,Port0};
Fd when Port0==0 ->
find_hostport(Fd)
end
catch
_:_ -> throw(bad_fd)
end,
{Port, WaitRequestControl, Options1} =
case Port1 of
0 -> %% Allocate the socket here to get the port number...
{ok,LSock} = ssh_acceptor:callback_listen(0, Options0),
{ok,{_,LPort}} = inet:sockname(LSock),
{LPort,
LSock,
?PUT_INTERNAL_OPT({lsocket,{LSock,self()}}, Options0)
};
_ ->
{Port1, false, Options0}
end,
Options = ?PUT_INTERNAL_OPT([{address, Host},
{port, Port},
{role, server}], Options1),
Profile = ?GET_OPT(profile, Options0),
case ssh_system_sup:system_supervisor(Host, Port, Profile) of
undefined ->
try sshd_sup:start_child(Options) of
{error, {already_started, _}} ->
{error, eaddrinuse};
Result = {ok,_} ->
sync_request_control(WaitRequestControl, Options),
Result;
Result = {error, _} ->
Result
catch
exit:{noproc, _} ->
{error, ssh_not_started}
end;
Sup ->
AccPid = ssh_system_sup:acceptor_supervisor(Sup),
case ssh_acceptor_sup:start_child(AccPid, Options) of
{error, {already_started, _}} ->
{error, eaddrinuse};
{ok, _} ->
sync_request_control(WaitRequestControl, Options),
{ok, Sup};
Other ->
Other
end
end.
call_ssh_acceptor_handle_connection(Host, Port, Options, Socket, DefaultResult) ->
{_, Callback, _} = ?GET_OPT(transport, Options),
try ssh_acceptor:handle_connection(Callback, Host, Port, Options, Socket)
of
{error,Error} -> {error,Error};
_ -> DefaultResult
catch
C:R -> {error,{could_not_start_connection,{C,R}}}
end.
sync_request_control(false, _Options) ->
ok;
sync_request_control(LSock, Options) ->
{_, Callback, _} = ?GET_OPT(transport, Options),
receive
{request_control,LSock,ReqPid} ->
ok = Callback:controlling_process(LSock, ReqPid),
ReqPid ! {its_yours,LSock},
ok
end.
find_hostport(Fd) ->
%% Using internal functions inet:open/8 and inet:close/0.
%% Don't try this at home unless you know what you are doing!
{ok,S} = inet:open(Fd, {0,0,0,0}, 0, [], tcp, inet, stream, inet_tcp),
{ok, HostPort} = inet:sockname(S),
ok = inet:close(S),
HostPort.
fmt_host({A,B,C,D}) ->
lists:concat([A,".",B,".",C,".",D]);
fmt_host(T={_,_,_,_,_,_,_,_}) ->
lists:flatten(string:join([io_lib:format("~.16B",[A]) || A <- tuple_to_list(T)], ":")).
