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authorHans Nilsson <[email protected]>2018-04-18 20:17:08 +0200
committerHans Nilsson <[email protected]>2018-04-25 16:03:07 +0200
commit5611b6139cb39a4e91a5cc6f61d698658120f49e (patch)
tree0814e87deeec11b6ddaaba570e0c893d359cd43f
parent960467ead200635cb935dfd3aa5a5abe38299ca6 (diff)
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ssh: New -spec and -type
-rw-r--r--lib/ssh/src/ssh.erl193
-rw-r--r--lib/ssh/src/ssh.hrl281
-rw-r--r--lib/ssh/src/ssh_channel.erl6
-rw-r--r--lib/ssh/src/ssh_cli.erl4
-rw-r--r--lib/ssh/src/ssh_client_key_api.erl35
-rw-r--r--lib/ssh/src/ssh_connect.hrl4
-rw-r--r--lib/ssh/src/ssh_connection.erl60
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl18
-rw-r--r--lib/ssh/src/ssh_daemon_channel.erl7
-rw-r--r--lib/ssh/src/ssh_file.erl21
-rw-r--r--lib/ssh/src/ssh_options.erl27
-rw-r--r--lib/ssh/src/ssh_server_key_api.erl12
-rw-r--r--lib/ssh/src/ssh_sftpd.erl16
-rw-r--r--lib/ssh/src/ssh_shell.erl15
14 files changed, 481 insertions, 218 deletions
diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index 25d537c624..209f53d249 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -41,35 +41,51 @@
shell/1, shell/2, shell/3
]).
+%%% "Deprecated" types export:
+-export_type([ssh_daemon_ref/0, ssh_connection_ref/0, ssh_channel_id/0]).
+-opaque ssh_daemon_ref() :: daemon_ref().
+-opaque ssh_connection_ref() :: connection_ref().
+-opaque ssh_channel_id() :: channel_id().
+
+
%%% Type exports
--export_type([ssh_daemon_ref/0,
- ssh_connection_ref/0,
- ssh_channel_id/0,
+-export_type([daemon_ref/0,
+ connection_ref/0,
+ channel_id/0,
+ client_options/0, client_option/0,
+ daemon_options/0, daemon_option/0,
+ common_options/0,
role/0,
subsystem_spec/0,
- subsystem_name/0,
- channel_callback/0,
- channel_init_args/0,
algs_list/0,
+ double_algs/1,
+ modify_algs_list/0,
alg_entry/0,
- simple_algs/0,
- double_algs/0
+ kex_alg/0,
+ pubkey_alg/0,
+ cipher_alg/0,
+ mac_alg/0,
+ compression_alg/0,
+ ip_port/0
]).
--opaque ssh_daemon_ref() :: daemon_ref() .
--opaque ssh_connection_ref() :: connection_ref() .
--opaque ssh_channel_id() :: channel_id().
+
+-opaque daemon_ref() :: pid() .
+-opaque channel_id() :: non_neg_integer().
+-type connection_ref() :: pid(). % should be -opaque, but that gives problems
%%--------------------------------------------------------------------
--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)
%%--------------------------------------------------------------------
+-spec start() -> ok | {error, term()}.
+
start() ->
start(temporary).
+-spec start(Type) -> ok | {error, term()} when
+ Type :: permanent | transient | temporary .
+
start(Type) ->
case application:ensure_all_started(ssh, Type) of
{ok, _} ->
@@ -79,30 +95,32 @@ start(Type) ->
end.
%%--------------------------------------------------------------------
--spec stop() -> ok | {error, term()}.
-%%
%% Description: Stops the ssh application.
%%--------------------------------------------------------------------
+-spec stop() -> ok | {error, term()}.
+
stop() ->
application:stop(ssh).
%%--------------------------------------------------------------------
--spec connect(inet:socket(), proplists:proplist()) -> ok_error(connection_ref()).
+%% Description: Starts an ssh connection.
+%%--------------------------------------------------------------------
+-spec connect(OpenTcpSocket, Options) -> {ok,connection_ref()} | {error,term()} when
+ OpenTcpSocket :: open_socket(),
+ Options :: client_options().
--spec connect(inet:socket(), proplists:proplist(), timeout()) -> ok_error(connection_ref())
- ; (string(), inet:port_number(), proplists:proplist()) -> ok_error(connection_ref()).
+connect(OpenTcpSocket, Options) when is_port(OpenTcpSocket),
+ is_list(Options) ->
+ connect(OpenTcpSocket, Options, infinity).
--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).
+-spec connect(open_socket(), client_options(), timeout()) ->
+ {ok,connection_ref()} | {error,term()}
+ ; (host(), inet:port_number(), client_options()) ->
+ {ok,connection_ref()} | {error,term()}.
-connect(Socket, UserOptions, Timeout) when is_port(Socket),
- is_list(UserOptions) ->
+connect(Socket, UserOptions, NegotiationTimeout) when is_port(Socket),
+ is_list(UserOptions) ->
case ssh_options:handle_options(client, UserOptions) of
{error, Error} ->
{error, Error};
@@ -111,16 +129,23 @@ connect(Socket, UserOptions, Timeout) when is_port(Socket),
ok ->
{ok, {Host,_Port}} = inet:sockname(Socket),
Opts = ?PUT_INTERNAL_OPT([{user_pid,self()}, {host,Host}], Options),
- ssh_connection_handler:start_connection(client, Socket, Opts, Timeout);
+ ssh_connection_handler:start_connection(client, Socket, Opts, NegotiationTimeout);
{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, Options) when is_integer(Port),
+ Port>0,
+ is_list(Options) ->
+ connect(Host, Port, Options, infinity).
+
+
+-spec connect(Host, Port, Options, NegotiationTimeout) -> {ok,connection_ref()} | {error,term()} when
+ Host :: host(),
+ Port :: inet:port_number(),
+ Options :: client_options(),
+ NegotiationTimeout :: timeout().
connect(Host0, Port, UserOptions, Timeout) when is_integer(Port),
Port>0,
@@ -148,7 +173,8 @@ connect(Host0, Port, UserOptions, Timeout) when is_integer(Port),
end.
%%--------------------------------------------------------------------
--spec close(pid()) -> ok.
+-spec close(ConnectionRef) -> ok | {error,term()} when
+ ConnectionRef :: connection_ref() .
%%
%% Description: Closes an ssh connection.
%%--------------------------------------------------------------------
@@ -156,15 +182,25 @@ 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 connection_info(ConnectionRef, Keys) -> ConnectionInfo when
+ ConnectionRef :: connection_ref(),
+ Keys :: [client_version | server_version | user | peer | sockname],
+ ConnectionInfo :: [{client_version, Version}
+ | {server_version, Version}
+ | {user,string()}
+ | {peer, {inet:hostname(), ip_port()}}
+ | {sockname, ip_port()}
+ ],
+ Version :: {ProtocolVersion, VersionString::string()},
+ ProtocolVersion :: {Major::pos_integer(), Minor::non_neg_integer()} .
+
+connection_info(Connection, Options) ->
+ ssh_connection_handler:connection_info(Connection, Options).
%%--------------------------------------------------------------------
--spec channel_info(pid(), channel_id(), [atom()]) -> [{atom(), term()}].
+-spec channel_info(connection_ref(), channel_id(), [atom()]) -> proplists:proplist().
%%
%% Description: Retrieves information about a connection.
%%--------------------------------------------------------------------
@@ -172,18 +208,17 @@ 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.
%%--------------------------------------------------------------------
+-spec daemon(inet:port_number()) -> {ok,daemon_ref()} | {error,term()}.
+
daemon(Port) ->
daemon(Port, []).
+
+-spec daemon(inet:port_number()|open_socket(), daemon_options()) -> {ok,daemon_ref()} | {error,term()}.
+
daemon(Socket, UserOptions) when is_port(Socket) ->
try
#{} = Options = ssh_options:handle_options(server, UserOptions),
@@ -226,6 +261,10 @@ daemon(Port, UserOptions) when 0 =< Port, Port =< 65535 ->
daemon(any, Port, UserOptions).
+-spec daemon(any | inet:ip_address(), inet:port_number(), daemon_options()) -> {ok,daemon_ref()} | {error,term()}
+ ;(socket, open_socket(), daemon_options()) -> {ok,daemon_ref()} | {error,term()}
+ .
+
daemon(Host0, Port0, UserOptions0) when 0 =< Port0, Port0 =< 65535,
Host0 == any ; Host0 == loopback ; is_tuple(Host0) ->
try
@@ -267,7 +306,12 @@ daemon(_, _, _) ->
{error, badarg}.
%%--------------------------------------------------------------------
--spec daemon_info(daemon_ref()) -> ok_error( [{atom(), term()}] ).
+-spec daemon_info(Daemon) -> {ok, DaemonInfo} | {error,term()} when
+ Daemon :: daemon_ref(),
+ DaemonInfo :: [ {ip, inet:ip_address()}
+ | {port, inet:port_number()}
+ | {profile, term()}
+ ].
daemon_info(Pid) ->
case catch ssh_system_sup:acceptor_supervisor(Pid) of
@@ -290,16 +334,23 @@ daemon_info(Pid) ->
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.
%%--------------------------------------------------------------------
+-spec stop_listener(daemon_ref()) -> ok.
+
stop_listener(SysSup) ->
ssh_system_sup:stop_listener(SysSup).
+
+
+-spec stop_listener(inet:ip_address(), inet:port_number()) -> ok.
+
stop_listener(Address, Port) ->
stop_listener(Address, Port, ?DEFAULT_PROFILE).
+
+
+-spec stop_listener(any|inet:ip_address(), inet:port_number(), term()) -> ok.
+
stop_listener(any, Port, Profile) ->
map_ip(fun(IP) ->
ssh_system_sup:stop_listener(IP, Port, Profile)
@@ -310,17 +361,23 @@ stop_listener(Address, Port, Profile) ->
end, {address,Address}).
%%--------------------------------------------------------------------
--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.
%%--------------------------------------------------------------------
+-spec stop_daemon(DaemonRef::daemon_ref()) -> ok.
+
stop_daemon(SysSup) ->
ssh_system_sup:stop_system(SysSup).
+
+
+-spec stop_daemon(inet:ip_address(), inet:port_number()) -> ok.
+
stop_daemon(Address, Port) ->
stop_daemon(Address, Port, ?DEFAULT_PROFILE).
+
+
+-spec stop_daemon(any|inet:ip_address(), inet:port_number(), atom()) -> ok.
+
stop_daemon(any, Port, Profile) ->
map_ip(fun(IP) ->
ssh_system_sup:stop_system(IP, Port, Profile)
@@ -331,33 +388,37 @@ stop_daemon(Address, Port, Profile) ->
end, {address,Address}).
%%--------------------------------------------------------------------
--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)
%%--------------------------------------------------------------------
+-spec shell(open_socket() | host()) -> _.
+
shell(Socket) when is_port(Socket) ->
shell(Socket, []);
shell(Host) ->
shell(Host, ?SSH_DEFAULT_PORT, []).
+
+-spec shell(open_socket() | host(), client_options()) -> _.
+
shell(Socket, Options) when is_port(Socket) ->
start_shell( connect(Socket, Options) );
shell(Host, Options) ->
shell(Host, ?SSH_DEFAULT_PORT, Options).
+
+-spec shell(Host, Port, Options) -> _ when
+ Host :: host(),
+ Port :: inet:port_number(),
+ Options :: client_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} ->
@@ -366,10 +427,16 @@ start_shell({ok, ConnectionRef}) ->
{init_args,[ConnectionRef, ChannelId]},
{cm, ConnectionRef}, {channel_id, ChannelId}],
{ok, State} = ssh_channel:init([Args]),
- ssh_channel:enter_loop(State);
+ try
+ ssh_channel:enter_loop(State)
+ catch
+ exit:normal ->
+ ok
+ end;
Error ->
Error
end;
+
start_shell(Error) ->
Error.
@@ -380,7 +447,7 @@ default_algorithms() ->
ssh_transport:default_algorithms().
%%--------------------------------------------------------------------
--spec chk_algos_opts(list(any())) -> algs_list() .
+-spec chk_algos_opts(client_options()|daemon_options()) -> internal_options() | {error,term()}.
%%--------------------------------------------------------------------
chk_algos_opts(Opts) ->
case lists:foldl(
diff --git a/lib/ssh/src/ssh.hrl b/lib/ssh/src/ssh.hrl
index 0e118ac13f..a3d9a1b1cb 100644
--- a/lib/ssh/src/ssh.hrl
+++ b/lib/ssh/src/ssh.hrl
@@ -98,35 +98,267 @@
%% Types
--type role() :: client | server .
--type ok_error(SuccessType) :: {ok, SuccessType} | {error, any()} .
--type daemon_ref() :: pid() .
+-type role() :: client | server .
+
+-type host() :: string() | inet:ip_address() | loopback .
+-type open_socket() :: gen_tcp:socket().
+
+-type subsystem_spec() :: {Name::string(), mod_args()} .
+
+-type algs_list() :: list( alg_entry() ).
+-type alg_entry() :: {kex, [kex_alg()]}
+ | {public_key, [pubkey_alg()]}
+ | {cipher, double_algs(cipher_alg())}
+ | {mac, double_algs(mac_alg())}
+ | {compression, double_algs(compression_alg())} .
+
+-type kex_alg() :: 'diffie-hellman-group-exchange-sha1' |
+ 'diffie-hellman-group-exchange-sha256' |
+ 'diffie-hellman-group1-sha1' |
+ 'diffie-hellman-group14-sha1' |
+ 'diffie-hellman-group14-sha256' |
+ 'diffie-hellman-group16-sha512' |
+ 'diffie-hellman-group18-sha512' |
+ 'ecdh-sha2-nistp256' |
+ 'ecdh-sha2-nistp384' |
+ 'ecdh-sha2-nistp521'
+ .
+
+-type pubkey_alg() :: 'ecdsa-sha2-nistp256' |
+ 'ecdsa-sha2-nistp384' |
+ 'ecdsa-sha2-nistp521' |
+ 'rsa-sha2-256' |
+ 'rsa-sha2-512' |
+ 'ssh-dss' |
+ 'ssh-rsa'
+ .
+
+-type cipher_alg() :: '3des-cbc' |
+ 'AEAD_AES_128_GCM' |
+ 'AEAD_AES_256_GCM' |
+ 'aes128-cbc' |
+ 'aes128-ctr' |
+ 'aes192-ctr' |
+ 'aes256-ctr' |
+ .
+
+-type mac_alg() :: 'AEAD_AES_128_GCM' |
+ 'AEAD_AES_256_GCM' |
+ 'hmac-sha1' |
+ 'hmac-sha2-256' |
+ 'hmac-sha2-512'
+ .
+
+-type compression_alg() :: 'none' |
+ 'zlib' |
+ .
+
+-type double_algs(AlgType) :: list( {client2server,[AlgType]} | {server2client,[AlgType]} )
+ | [AlgType].
+
+-type modify_algs_list() :: list( {append,algs_list()} | {prepend,algs_list()} | {rm,algs_list()} ) .
+
+-type internal_options() :: ssh_options:private_options().
+-type socket_options() :: [gen_tcp:connect_option() | gen_tcp:listen_option()].
+
+-type client_options() :: [ client_option() ] .
+-type daemon_options() :: [ daemon_option() ].
+
+
+-type common_options() :: [ common_option() ].
+-type common_option() ::
+ user_dir_common_option()
+ | profile_common_option()
+ | max_idle_time_common_option()
+ | key_cb_common_option()
+ | disconnectfun_common_option()
+ | unexpectedfun_common_option()
+ | ssh_msg_debug_fun_common_option()
+ | rekey_limit_common_option()
+ | id_string_common_option()
+ | preferred_algorithms_common_option()
+ | modify_algorithms_common_option()
+ | auth_methods_common_option()
+ | inet_common_option()
+ | fd_common_option()
+ .
+
+-define(COMMON_OPTION, common_option()).
+
+
+-type user_dir_common_option() :: {user_dir, false | string()}.
+-type profile_common_option() :: {profile, atom() }.
+-type max_idle_time_common_option() :: {idle_time, timeout()}.
+-type rekey_limit_common_option() :: {rekey_limit, non_neg_integer() }.
+
+-type key_cb_common_option() :: {key_cb, Module::atom() | {Module::atom(),Opts::[term()]} } .
+-type disconnectfun_common_option() ::
+ {disconnectfun, fun((Reason::term()) -> void | any()) }.
+-type unexpectedfun_common_option() ::
+ {unexpectedfun, fun((Message::term(),{Host::term(),Port::term()}) -> report | skip ) }.
+-type ssh_msg_debug_fun_common_option() ::
+ {ssh_msg_debug_fun, fun((ssh:connection_ref(),AlwaysDisplay::boolean(),Msg::binary(),LanguageTag::binary()) -> any()) } .
+
+-type id_string_common_option() :: {id_string, string() | random | {random,Nmin::pos_integer(),Nmax::pos_integer()} }.
+-type preferred_algorithms_common_option():: {preferred_algorithms, algs_list()}.
+-type modify_algorithms_common_option() :: {modify_algorithms, modify_algs_list()}.
+-type auth_methods_common_option() :: {auth_methods, string() }.
+
+-type inet_common_option() :: {inet, inet | inet6} .
+-type fd_common_option() :: {fd, gen_tcp:socket()} .
+
+
+-type opaque_common_options() ::
+ {transport, {atom(),atom(),atom()} }
+ | {vsn, {non_neg_integer(),non_neg_integer()} }
+ | {tstflg, list(term())}
+ | {user_dir_fun, fun()}
+ | {max_random_length_padding, non_neg_integer()} .
+
+
+
+-type client_option() ::
+ pref_public_key_algs_client_option()
+ | pubkey_passphrase_client_options()
+ | host_accepting_client_options()
+ | authentication_client_options()
+ | diffie_hellman_group_exchange_client_option()
+ | connect_timeout_client_option()
+ | recv_ext_info_client_option()
+ | opaque_client_options()
+ | gen_tcp:connect_option()
+ | ?COMMON_OPTION .
+
+-type opaque_client_options() ::
+ {keyboard_interact_fun, fun((term(),term(),term()) -> term())}
+ | opaque_common_options().
+
+-type pref_public_key_algs_client_option() :: {pref_public_key_algs, [pubkey_alg()] } .
+
+-type pubkey_passphrase_client_options() :: {dsa_pass_phrase, string()}
+ | {rsa_pass_phrase, string()}
+ | {ecdsa_pass_phrase, string()} .
+
+-type host_accepting_client_options() ::
+ {silently_accept_hosts, accept_hosts()}
+ | {user_interaction, boolean()}
+ | {save_accepted_host, boolean()}
+ | {quiet_mode, boolean()} .
+
+-type accept_hosts() :: boolean()
+ | accept_callback()
+ | {HashAlgoSpec::fp_digest_alg(), accept_callback()}.
+
+-type fp_digest_alg() :: 'md5' |
+ 'sha' |
+ 'sha224' |
+ 'sha256' |
+ 'sha384' |
+ 'sha512'
+ .
+
+-type accept_callback() :: fun((PeerName::string(), fingerprint() ) -> boolean()) .
+-type fingerprint() :: string() | [string()].
+
+-type authentication_client_options() ::
+ {user, string()}
+ | {password, string()} .
+
+-type diffie_hellman_group_exchange_client_option() ::
+ {dh_gex_limits, {Min::pos_integer(), I::pos_integer(), Max::pos_integer()} } .
+
+-type connect_timeout_client_option() :: {connect_timeout, timeout()} .
+
+-type recv_ext_info_client_option() :: {recv_ext_info, boolean()} .
+
+
+
+-type daemon_option() ::
+ subsystem_daemon_option()
+ | shell_daemon_option()
+ | exec_daemon_option()
+ | ssh_cli_daemon_option()
+ | authentication_daemon_options()
+ | diffie_hellman_group_exchange_daemon_option()
+ | negotiation_timeout_daemon_option()
+ | hardening_daemon_options()
+ | callbacks_daemon_options()
+ | send_ext_info_daemon_option()
+ | opaque_daemon_options()
+ | gen_tcp:listen_option()
+ | ?COMMON_OPTION .
--type subsystem_spec() :: {subsystem_name(), {channel_callback(), channel_init_args()}} .
--type subsystem_name() :: string() .
--type channel_callback() :: atom() .
--type channel_init_args() :: list() .
+-type subsystem_daemon_option() :: {subsystems, subsystem_spec()}.
--type algs_list() :: list( alg_entry() ).
--type alg_entry() :: {kex, simple_algs()}
- | {public_key, simple_algs()}
- | {cipher, double_algs()}
- | {mac, double_algs()}
- | {compression, double_algs()} .
--type simple_algs() :: list( atom() ) .
--type double_algs() :: list( {client2server,simple_algs()} | {server2client,simple_algs()} )
- | simple_algs() .
+-type shell_daemon_option() :: {shell, mod_fun_args() | 'shell_fun/1'() | 'shell_fun/2'() }.
+-type 'shell_fun/1'() :: fun((User::string()) -> pid()) .
+-type 'shell_fun/2'() :: fun((User::string(), PeerAddr::inet:ip_address()) -> pid()).
--type options() :: #{socket_options := socket_options(),
- internal_options := internal_options(),
- option_key() => any()
- }.
+-type exec_daemon_option() :: {exec, 'exec_fun/1'() | 'exec_fun/2'() | 'exec_fun/3'() }.
--type socket_options() :: proplists:proplist().
--type internal_options() :: #{option_key() => any()}.
+-type 'exec_fun/1'() :: fun((Cmd::string()) -> exec_result()) .
+-type 'exec_fun/2'() :: fun((Cmd::string(), User::string()) -> exec_result()) .
+-type 'exec_fun/3'() :: fun((Cmd::string(), User::string(), ClientAddr::ip_port()) -> exec_result()) .
+-type exec_result() :: {ok,Result::term()} | {error,Reason::term()} .
--type option_key() :: atom().
+-type ssh_cli_daemon_option() :: {ssh_cli, mod_args() | no_cli }.
+-type send_ext_info_daemon_option() :: {send_ext_info, boolean()} .
+
+-type authentication_daemon_options() ::
+ {system_dir, string()}
+ | {auth_method_kb_interactive_data, prompt_texts() }
+ | {user_passwords, [{UserName::string(),Pwd::string()}]}
+ | {password, string()}
+ | {pwdfun, pwdfun_2() | pwdfun_4()} .
+
+-type prompt_texts() ::
+ kb_int_tuple()
+ | kb_int_fun_3()
+ .
+
+-type kb_int_fun_3() :: fun((Peer::ip_port(), User::string(), Service::string()) -> kb_int_tuple()).
+-type kb_int_tuple() :: {Name::string(), Instruction::string(), Prompt::string(), Echo::boolean()}.
+
+-type pwdfun_2() :: fun((User::string(), Password::string()) -> boolean()) .
+-type pwdfun_4() :: fun((User::string(),
+ Password::string(),
+ PeerAddress::ip_port(),
+ State::any()) ->
+ boolean() | disconnect | {boolean(),NewState::any()}
+ ) .
+
+-type diffie_hellman_group_exchange_daemon_option() ::
+ {dh_gex_groups, [explicit_group()] | explicit_group_file() | ssh_moduli_file()}
+ | {dh_gex_limits, {Min::pos_integer(), Max::pos_integer()} } .
+
+-type explicit_group() :: {Size::pos_integer(),G::pos_integer(),P::pos_integer()} .
+-type explicit_group_file() :: {file,string()} .
+-type ssh_moduli_file() :: {ssh_moduli_file,string()}.
+
+-type negotiation_timeout_daemon_option() :: {negotiation_timeout, timeout()} .
+
+-type hardening_daemon_options() ::
+ {max_sessions, pos_integer()}
+ | {max_channels, pos_integer()}
+ | {parallel_login, boolean()}
+ | {minimal_remote_max_packet_size, pos_integer()}.
+
+-type callbacks_daemon_options() ::
+ {failfun, fun((User::string(), PeerAddress::inet:ip_address(), Reason::term()) -> _)}
+ | {connectfun, fun((User::string(), PeerAddress::inet:ip_address(), Method::string()) ->_)} .
+
+-type opaque_daemon_options() ::
+ {infofun, fun()}
+ | opaque_common_options().
+
+-type ip_port() :: {inet:ip_address(), inet:port_number()} .
+
+-type mod_args() :: {Module::atom(), Args::list()} .
+-type mod_fun_args() :: {Module::atom(), Function::atom(), Args::list()} .
%% Records
@@ -134,8 +366,7 @@
{
role :: client | role(),
peer :: undefined |
- {inet:hostname(),
- {inet:ip_address(),inet:port_number()}}, %% string version of peer address
+ {inet:hostname(),ip_port()}, %% string version of peer address
local, %% Local sockname. Need this AFTER a socket is closed by i.e. a crash
diff --git a/lib/ssh/src/ssh_channel.erl b/lib/ssh/src/ssh_channel.erl
index b90e571448..359e29fdbe 100644
--- a/lib/ssh/src/ssh_channel.erl
+++ b/lib/ssh/src/ssh_channel.erl
@@ -50,11 +50,11 @@
{ok, NewState :: term()} | {error, Reason :: term()}.
-callback handle_msg(Msg ::term(), State :: term()) ->
- {ok, State::term()} | {stop, ChannelId::integer(), State::term()}.
+ {ok, State::term()} | {stop, ChannelId::ssh:channel_id(), State::term()}.
--callback handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()},
+-callback handle_ssh_msg({ssh_cm, ConnectionRef::ssh:connection_ref(), SshMsg::term()},
State::term()) -> {ok, State::term()} |
- {stop, ChannelId::integer(),
+ {stop, ChannelId::ssh:channel_id(),
State::term()}.
-behaviour(gen_server).
diff --git a/lib/ssh/src/ssh_cli.erl b/lib/ssh/src/ssh_cli.erl
index 26c7cb45aa..b45dbc3e37 100644
--- a/lib/ssh/src/ssh_cli.erl
+++ b/lib/ssh/src/ssh_cli.erl
@@ -59,10 +59,10 @@
term().
-spec handle_msg(Msg ::term(), State :: term()) ->
- {ok, State::term()} | {stop, ChannelId::integer(), State::term()}.
+ {ok, State::term()} | {stop, ChannelId::ssh:channel_id(), State::term()}.
-spec handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()},
State::term()) -> {ok, State::term()} |
- {stop, ChannelId::integer(),
+ {stop, ChannelId::ssh:channel_id(),
State::term()}.
%%--------------------------------------------------------------------
diff --git a/lib/ssh/src/ssh_client_key_api.erl b/lib/ssh/src/ssh_client_key_api.erl
index 6e994ff292..d0d8ab25d6 100644
--- a/lib/ssh/src/ssh_client_key_api.erl
+++ b/lib/ssh/src/ssh_client_key_api.erl
@@ -23,26 +23,25 @@
-include_lib("public_key/include/public_key.hrl").
-include("ssh.hrl").
--export_type([algorithm/0]).
-
--type algorithm() :: 'ssh-rsa'
- | 'ssh-dss'
- | 'ecdsa-sha2-nistp256'
- | 'ecdsa-sha2-nistp384'
- | 'ecdsa-sha2-nistp521'
- .
-
--callback is_host_key(PublicKey :: public_key:public_key(),
- Host :: string(),
- Algorithm :: algorithm(),
- ConnectOptions :: proplists:proplist()) ->
+-export_type([client_key_cb_options/0]).
+
+-type client_key_cb_options() :: [{key_cb_private,term()} | ssh:client_option()].
+
+-callback is_host_key(Key :: public_key:public_key(),
+ Host :: string(),
+ Algorithm :: ssh:pubkey_alg(),
+ Options :: client_key_cb_options()
+ ) ->
boolean().
--callback user_key(Algorithm :: algorithm(),
- ConnectOptions :: proplists:proplist()) ->
- {ok, PrivateKey::public_key:private_key()} | {error, term()}.
+-callback user_key(Algorithm :: ssh:pubkey_alg(),
+ Options :: client_key_cb_options()
+ ) ->
+ {ok, PrivateKey :: public_key:private_key()} | {error, string()}.
--callback add_host_key(Host :: string(), PublicKey :: public_key:public_key(),
- Options :: proplists:proplist()) ->
+-callback add_host_key(Host :: string(),
+ PublicKey :: public_key:public_key(),
+ Options :: client_key_cb_options()
+ ) ->
ok | {error, Error::term()}.
diff --git a/lib/ssh/src/ssh_connect.hrl b/lib/ssh/src/ssh_connect.hrl
index a8de5f9a2f..3c61638285 100644
--- a/lib/ssh/src/ssh_connect.hrl
+++ b/lib/ssh/src/ssh_connect.hrl
@@ -22,10 +22,6 @@
%%% Description : SSH connection protocol
--type channel_id() :: pos_integer().
--type connection_ref() :: pid().
-
-
-define(DEFAULT_PACKET_SIZE, 65536).
-define(DEFAULT_WINDOW_SIZE, 10*?DEFAULT_PACKET_SIZE).
diff --git a/lib/ssh/src/ssh_connection.erl b/lib/ssh/src/ssh_connection.erl
index 2b8780a991..bfe17c7541 100644
--- a/lib/ssh/src/ssh_connection.erl
+++ b/lib/ssh/src/ssh_connection.erl
@@ -64,29 +64,32 @@
bound_channel/3, encode_ip/1
]).
+-type connection_ref() :: ssh:connection_ref().
+-type channel_id() :: ssh:channel_id().
+
%%--------------------------------------------------------------------
%%% API
%%--------------------------------------------------------------------
%%--------------------------------------------------------------------
--spec session_channel(connection_ref(), timeout()) -> {ok, channel_id()} | {error, timeout | closed}.
--spec session_channel(connection_ref(), integer(), integer(), timeout()) -> {ok, channel_id()} | {error, timeout | closed}.
-
%% Description: Opens a channel for a ssh session. A session is a
%% remote execution of a program. The program may be a shell, an
%% application, a system command, or some built-in subsystem.
%% --------------------------------------------------------------------
+-spec session_channel(connection_ref(), timeout()) ->
+ {ok, channel_id()} | {error, timeout | closed}.
+
session_channel(ConnectionHandler, Timeout) ->
- session_channel(ConnectionHandler,
- ?DEFAULT_WINDOW_SIZE, ?DEFAULT_PACKET_SIZE,
- Timeout).
+ session_channel(ConnectionHandler, ?DEFAULT_WINDOW_SIZE, ?DEFAULT_PACKET_SIZE, Timeout).
-session_channel(ConnectionHandler, InitialWindowSize,
- MaxPacketSize, Timeout) ->
+-spec session_channel(connection_ref(), integer(), integer(), timeout()) ->
+ {ok, channel_id()} | {error, timeout | closed}.
+
+session_channel(ConnectionHandler, InitialWindowSize, MaxPacketSize, Timeout) ->
case ssh_connection_handler:open_channel(ConnectionHandler, "session", <<>>,
- InitialWindowSize,
- MaxPacketSize, Timeout) of
+ InitialWindowSize,
+ MaxPacketSize, Timeout) of
{open, Channel} ->
{ok, Channel};
Error ->
@@ -125,24 +128,30 @@ subsystem(ConnectionHandler, ChannelId, SubSystem, TimeOut) ->
ChannelId, "subsystem",
true, [?string(SubSystem)], TimeOut).
%%--------------------------------------------------------------------
--spec send(connection_ref(), channel_id(), iodata()) ->
- ok | {error, closed}.
--spec send(connection_ref(), channel_id(), integer()| iodata(), timeout() | iodata()) ->
- ok | {error, timeout} | {error, closed}.
--spec send(connection_ref(), channel_id(), integer(), iodata(), timeout()) ->
- ok | {error, timeout} | {error, closed}.
-%%
-%%
%% Description: Sends channel data.
%%--------------------------------------------------------------------
+-spec send(connection_ref(), channel_id(), iodata()) ->
+ ok | {error, closed}.
send(ConnectionHandler, ChannelId, Data) ->
send(ConnectionHandler, ChannelId, 0, Data, infinity).
+
+
+-spec send(connection_ref(), channel_id(), integer()| iodata(), timeout() | iodata()) ->
+ ok | {error, timeout} | {error, closed}.
+
send(ConnectionHandler, ChannelId, Data, TimeOut) when is_integer(TimeOut) ->
send(ConnectionHandler, ChannelId, 0, Data, TimeOut);
+
send(ConnectionHandler, ChannelId, Data, infinity) ->
send(ConnectionHandler, ChannelId, 0, Data, infinity);
+
send(ConnectionHandler, ChannelId, Type, Data) ->
send(ConnectionHandler, ChannelId, Type, Data, infinity).
+
+
+-spec send(connection_ref(), channel_id(), integer(), iodata(), timeout()) ->
+ ok | {error, timeout} | {error, closed}.
+
send(ConnectionHandler, ChannelId, Type, Data, TimeOut) ->
ssh_connection_handler:send(ConnectionHandler, ChannelId,
Type, Data, TimeOut).
@@ -156,7 +165,7 @@ send_eof(ConnectionHandler, Channel) ->
ssh_connection_handler:send_eof(ConnectionHandler, Channel).
%%--------------------------------------------------------------------
--spec adjust_window(connection_ref(), channel_id(), integer()) -> ok | {error, closed}.
+-spec adjust_window(connection_ref(), channel_id(), integer()) -> ok.
%%
%%
%% Description: Adjusts the ssh flowcontrol window.
@@ -198,17 +207,18 @@ reply_request(_,false, _, _) ->
ok.
%%--------------------------------------------------------------------
+%% Description: Sends a ssh connection protocol pty_req.
+%%--------------------------------------------------------------------
-spec ptty_alloc(connection_ref(), channel_id(), proplists:proplist()) ->
success | failiure | {error, closed}.
--spec ptty_alloc(connection_ref(), channel_id(), proplists:proplist(), timeout()) ->
- success | failiure | {error, timeout} | {error, closed}.
-%%
-%%
-%% Description: Sends a ssh connection protocol pty_req.
-%%--------------------------------------------------------------------
ptty_alloc(ConnectionHandler, Channel, Options) ->
ptty_alloc(ConnectionHandler, Channel, Options, infinity).
+
+
+-spec ptty_alloc(connection_ref(), channel_id(), proplists:proplist(), timeout()) ->
+ success | failiure | {error, timeout} | {error, closed}.
+
ptty_alloc(ConnectionHandler, Channel, Options0, TimeOut) ->
TermData = backwards_compatible(Options0, []), % FIXME
{Width, PixWidth} = pty_default_dimensions(width, TermData),
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index 033f11f4a1..1b3763e9c7 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -60,6 +60,9 @@
get_print_info/1
]).
+-type connection_ref() :: ssh:connection_ref().
+-type channel_id() :: ssh:channel_id().
+
%%% Behaviour callbacks
-export([init/1, callback_mode/0, handle_event/4, terminate/3,
format_status/2, code_change/4]).
@@ -88,8 +91,8 @@
%%====================================================================
%%--------------------------------------------------------------------
-spec start_link(role(),
- inet:socket(),
- ssh_options:options()
+ gen_tcp:socket(),
+ internal_options()
) -> {ok, pid()}.
%% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
start_link(Role, Socket, Options) ->
@@ -118,8 +121,8 @@ stop(ConnectionHandler)->
%%--------------------------------------------------------------------
-spec start_connection(role(),
- inet:socket(),
- ssh_options:options(),
+ gen_tcp:socket(),
+ internal_options(),
timeout()
) -> {ok, connection_ref()} | {error, term()}.
%% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
@@ -359,7 +362,7 @@ alg(ConnectionHandler) ->
| undefined, % ex: tcp_closed
ssh_params :: #ssh{}
| undefined,
- socket :: inet:socket()
+ socket :: gen_tcp:socket()
| undefined,
decrypted_data_buffer = <<>> :: binary()
| undefined,
@@ -370,7 +373,6 @@ alg(ConnectionHandler) ->
| undefined,
last_size_rekey = 0 :: non_neg_integer(),
event_queue = [] :: list(),
-% opts :: ssh_options:options(),
inet_initial_recbuf_size :: pos_integer()
| undefined
}).
@@ -380,8 +382,8 @@ alg(ConnectionHandler) ->
%%====================================================================
%%--------------------------------------------------------------------
-spec init_connection_handler(role(),
- inet:socket(),
- ssh_options:options()
+ gen_tcp:socket(),
+ internal_options()
) -> no_return().
%% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
init_connection_handler(Role, Socket, Opts) ->
diff --git a/lib/ssh/src/ssh_daemon_channel.erl b/lib/ssh/src/ssh_daemon_channel.erl
index 6ca93eff44..72853f2d6a 100644
--- a/lib/ssh/src/ssh_daemon_channel.erl
+++ b/lib/ssh/src/ssh_daemon_channel.erl
@@ -36,10 +36,10 @@
term().
-callback handle_msg(Msg ::term(), State :: term()) ->
- {ok, State::term()} | {stop, ChannelId::integer(), State::term()}.
--callback handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()},
+ {ok, State::term()} | {stop, ChannelId::ssh:channel_id(), State::term()}.
+-callback handle_ssh_msg({ssh_cm, ConnectionRef::ssh:connection_ref(), SshMsg::term()},
State::term()) -> {ok, State::term()} |
- {stop, ChannelId::integer(),
+ {stop, ChannelId::ssh:channel_id(),
State::term()}.
%%% API
@@ -48,6 +48,7 @@
%% gen_server callbacks
-export([init/1, terminate/2]).
+-spec start(ssh:connection_ref(), ssh:channel_id(), atom(), term()) -> term().
start(ConnectionManager, ChannelId, CallBack, CbInitArgs) ->
ssh_channel:start(ConnectionManager, ChannelId, CallBack, CbInitArgs, undefined).
diff --git a/lib/ssh/src/ssh_file.erl b/lib/ssh/src/ssh_file.erl
index 33792da38f..9cab2fe0bd 100644
--- a/lib/ssh/src/ssh_file.erl
+++ b/lib/ssh/src/ssh_file.erl
@@ -45,27 +45,6 @@
%%% API
-%%% client
--spec add_host_key(string(),
- public_key:public_key(),
- proplists:proplist()) -> ok | {error,term()}.
-
--spec is_host_key(public_key:public_key(),
- string(),
- ssh_client_key_api:algorithm(),
- proplists:proplist()) -> boolean().
-
--spec user_key(ssh_client_key_api:algorithm(),
- proplists:proplist()) -> {ok, public_key:private_key()} | {error,term()}.
-
-%%% server
--spec host_key(ssh_server_key_api:algorithm(),
- proplists:proplist()) -> {ok, public_key:private_key()} | {error,term()}.
-
--spec is_auth_key(public_key:public_key(),
- string(), proplists:proplist()) -> boolean().
-
-
%% Used by server
host_key(Algorithm, Opts) ->
File = file_name(system, file_base_name(Algorithm), Opts),
diff --git a/lib/ssh/src/ssh_options.erl b/lib/ssh/src/ssh_options.erl
index c05293d1ae..4dd9082250 100644
--- a/lib/ssh/src/ssh_options.erl
+++ b/lib/ssh/src/ssh_options.erl
@@ -32,7 +32,7 @@
handle_options/2
]).
--export_type([options/0
+-export_type([private_options/0
]).
%%%================================================================
@@ -47,16 +47,23 @@
default => any()
}.
+-type option_key() :: atom().
+
-type option_declarations() :: #{ {option_key(),def} := option_declaration() }.
-type error() :: {error,{eoptions,any()}} .
+-type private_options() :: #{socket_options := socket_options(),
+ internal_options := internal_options(),
+ option_key() => any()
+ }.
+
%%%================================================================
%%%
%%% Get an option
%%%
--spec get_value(option_class(), option_key(), options(),
+-spec get_value(option_class(), option_key(), private_options(),
atom(), non_neg_integer()) -> any() | no_return().
get_value(Class, Key, Opts, _CallerMod, _CallerLine) when is_map(Opts) ->
@@ -69,7 +76,7 @@ get_value(Class, Key, Opts, _CallerMod, _CallerLine) ->
error({bad_options,Class, Key, Opts, _CallerMod, _CallerLine}).
--spec get_value(option_class(), option_key(), options(), fun(() -> any()),
+-spec get_value(option_class(), option_key(), private_options(), fun(() -> any()),
atom(), non_neg_integer()) -> any() | no_return().
get_value(socket_options, Key, Opts, DefFun, _CallerMod, _CallerLine) when is_map(Opts) ->
@@ -91,8 +98,8 @@ get_value(Class, Key, Opts, _DefFun, _CallerMod, _CallerLine) ->
%%% Put an option
%%%
--spec put_value(option_class(), option_in(), options(),
- atom(), non_neg_integer()) -> options().
+-spec put_value(option_class(), option_in(), private_options(),
+ atom(), non_neg_integer()) -> private_options().
put_value(user_options, KeyVal, Opts, _CallerMod, _CallerLine) when is_map(Opts) ->
put_user_value(KeyVal, Opts);
@@ -131,8 +138,8 @@ put_socket_value(A, SockOpts) when is_atom(A) ->
%%% Delete an option
%%%
--spec delete_key(option_class(), option_key(), options(),
- atom(), non_neg_integer()) -> options().
+-spec delete_key(option_class(), option_key(), private_options(),
+ atom(), non_neg_integer()) -> private_options().
delete_key(internal_options, Key, Opts, _CallerMod, _CallerLine) when is_map(Opts) ->
InternalOpts = maps:get(internal_options,Opts),
@@ -144,9 +151,7 @@ delete_key(internal_options, Key, Opts, _CallerMod, _CallerLine) when is_map(Opt
%%% Initialize the options
%%%
--spec handle_options(role(), proplists:proplist()) -> options() | error() .
-
--spec handle_options(role(), proplists:proplist(), options()) -> options() | error() .
+-spec handle_options(role(), client_options()|daemon_options()) -> private_options() | error() .
handle_options(Role, PropList0) ->
handle_options(Role, PropList0, #{socket_options => [],
@@ -155,7 +160,7 @@ handle_options(Role, PropList0) ->
}).
handle_options(Role, PropList0, Opts0) when is_map(Opts0),
- is_list(PropList0) ->
+ is_list(PropList0) ->
PropList1 = proplists:unfold(PropList0),
try
OptionDefinitions = default(Role),
diff --git a/lib/ssh/src/ssh_server_key_api.erl b/lib/ssh/src/ssh_server_key_api.erl
index 3f1b886fa7..a285bf9475 100644
--- a/lib/ssh/src/ssh_server_key_api.erl
+++ b/lib/ssh/src/ssh_server_key_api.erl
@@ -23,16 +23,18 @@
-include_lib("public_key/include/public_key.hrl").
-include("ssh.hrl").
--export_type([algorithm/0]).
+-export_type([daemon_key_cb_options/0]).
--type algorithm() :: ssh_client_key_api:algorithm().
+-type daemon_key_cb_options() :: [{key_cb_private,term()} | ssh:daemon_option()].
--callback host_key(Algorithm :: algorithm(),
- DaemonOptions :: proplists:proplist()) ->
+-callback host_key(Algorithm :: ssh:pubkey_alg(),
+ DaemonOptions :: daemon_key_cb_options()
+ ) ->
{ok, PrivateKey :: public_key:private_key()} | {error, term()}.
-callback is_auth_key(PublicKey :: public_key:public_key(),
User :: string(),
- DaemonOptions :: proplists:proplist()) ->
+ DaemonOptions :: daemon_key_cb_options()
+ ) ->
boolean().
diff --git a/lib/ssh/src/ssh_sftpd.erl b/lib/ssh/src/ssh_sftpd.erl
index 945e9f457b..fda9a38a43 100644
--- a/lib/ssh/src/ssh_sftpd.erl
+++ b/lib/ssh/src/ssh_sftpd.erl
@@ -58,21 +58,7 @@
%%====================================================================
%% API
%%====================================================================
--spec init(Args :: term()) ->
- {ok, State :: term()} | {ok, State :: term(), timeout() | hibernate} |
- {stop, Reason :: term()} | ignore.
-
--spec terminate(Reason :: (normal | shutdown | {shutdown, term()} |
- term()),
- State :: term()) ->
- term().
-
--spec handle_msg(Msg ::term(), State :: term()) ->
- {ok, State::term()} | {stop, ChannelId::integer(), State::term()}.
--spec handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()},
- State::term()) -> {ok, State::term()} |
- {stop, ChannelId::integer(),
- State::term()}.
+-spec subsystem_spec(list()) -> subsystem_spec().
subsystem_spec(Options) ->
{"sftp", {?MODULE, Options}}.
diff --git a/lib/ssh/src/ssh_shell.erl b/lib/ssh/src/ssh_shell.erl
index 085534592d..c7c63c5c43 100644
--- a/lib/ssh/src/ssh_shell.erl
+++ b/lib/ssh/src/ssh_shell.erl
@@ -48,21 +48,6 @@
%%====================================================================
%% ssh_channel callbacks
%%====================================================================
--spec init(Args :: term()) ->
- {ok, State :: term()} | {ok, State :: term(), timeout() | hibernate} |
- {stop, Reason :: term()} | ignore.
-
--spec terminate(Reason :: (normal | shutdown | {shutdown, term()} |
- term()),
- State :: term()) ->
- term().
-
--spec handle_msg(Msg ::term(), State :: term()) ->
- {ok, State::term()} | {stop, ChannelId::integer(), State::term()}.
--spec handle_ssh_msg({ssh_cm, ConnectionRef::term(), SshMsg::term()},
- State::term()) -> {ok, State::term()} |
- {stop, ChannelId::integer(),
- State::term()}.
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State}