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tftp_engine.erl
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tftp_engine.erl
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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2005-2009. 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%
%%
%%-------------------------------------------------------------------
%% Protocol engine for trivial FTP
%%-------------------------------------------------------------------
-module(tftp_engine).
%%%-------------------------------------------------------------------
%%% Interface
%%%-------------------------------------------------------------------
%% application internal functions
-export([
daemon_start/1,
daemon_loop/1,
daemon_loop/3, %% Handle upgrade from old releases. Please, remove this function in next release.
client_start/4,
common_loop/6,
info/1,
change_config/2
]).
%% module internal
-export([
daemon_init/1,
server_init/2,
client_init/2,
wait_for_msg/3,
callback/4
]).
%% sys callback functions
-export([
system_continue/3,
system_terminate/4,
system_code_change/4
]).
-include("tftp.hrl").
-type prep_status() :: 'error' | 'last' | 'more' | 'terminate'.
-record(daemon_state, {config, n_servers, server_tab, file_tab}).
-record(server_info, {pid, req, peer}).
-record(file_info, {peer_req, pid}).
-record(sys_misc, {module, function, arguments}).
-record(error, {where, code, text, filename}).
-record(prepared, {status :: prep_status(), result, block_no, next_data, prev_data}).
-record(transfer_res, {status, decoded_msg, prepared}).
-define(ERROR(Where, Code, Text, Filename),
#error{where = Where, code = Code, text = Text, filename = Filename}).
%%%-------------------------------------------------------------------
%%% Info
%%%-------------------------------------------------------------------
info(daemons) ->
Daemons = supervisor:which_children(tftp_sup),
[{Pid, info(Pid)} || {_, Pid, _, _} <- Daemons];
info(servers) ->
[{Pid, info(Pid)} || {_, {ok, DeamonInfo}} <- info(daemons),
{server, Pid} <- DeamonInfo];
info(ToPid) when is_pid(ToPid) ->
call(info, ToPid, timer:seconds(10)).
change_config(daemons, Options) ->
Daemons = supervisor:which_children(tftp_sup),
[{Pid, change_config(Pid, Options)} || {_, Pid, _, _} <- Daemons];
change_config(servers, Options) ->
[{Pid, change_config(Pid, Options)} || {_, {ok, DeamonInfo}} <- info(daemons),
{server, Pid} <- DeamonInfo];
change_config(ToPid, Options) when is_pid(ToPid) ->
BadKeys = [host, port, udp],
BadOptions = [{Key, Val} || {Key, Val} <- Options,
BadKey <- BadKeys,
Key =:= BadKey],
case BadOptions of
[] ->
call({change_config, Options}, ToPid, timer:seconds(10));
[{Key, Val} | _] ->
{error, {badarg, {Key, Val}}}
end.
call(Req, ToPid, Timeout) when is_pid(ToPid) ->
Type = process,
Ref = erlang:monitor(Type, ToPid),
ToPid ! {Req, Ref, self()},
receive
{Reply, Ref, FromPid} when FromPid =:= ToPid ->
erlang:demonitor(Ref, [flush]),
Reply;
{'DOWN', Ref, Type, FromPid, _Reason} when FromPid =:= ToPid ->
{error, timeout}
after Timeout ->
{error, timeout}
end.
reply(Reply, Ref, ToPid) ->
ToPid ! {Reply, Ref, self()}.
%%%-------------------------------------------------------------------
%%% Daemon
%%%-------------------------------------------------------------------
%% Returns {ok, Port}
daemon_start(Options) when is_list(Options) ->
Config = tftp_lib:parse_config(Options),
proc_lib:start_link(?MODULE, daemon_init, [Config], infinity).
daemon_init(Config) when is_record(Config, config),
is_pid(Config#config.parent_pid) ->
process_flag(trap_exit, true),
{Port, UdpOptions} = prepare_daemon_udp(Config),
case catch gen_udp:open(Port, UdpOptions) of
{ok, Socket} ->
{ok, ActualPort} = inet:port(Socket),
proc_lib:init_ack({ok, self()}),
Config2 = Config#config{udp_socket = Socket,
udp_port = ActualPort},
print_debug_info(Config2, daemon, open, #tftp_msg_req{filename = ""}),
ServerTab = ets:new(tftp_daemon_servers, [{keypos, 2}]),
FileTab = ets:new(tftp_daemon_files, [{keypos, 2}]),
State = #daemon_state{config = Config2,
n_servers = 0,
server_tab = ServerTab,
file_tab = FileTab},
daemon_loop(State);
{error, Reason} ->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [UdpOptions, Reason])),
print_debug_info(Config, daemon, open, ?ERROR(open, undef, Text, "")),
exit({gen_udp_open, UdpOptions, Reason});
Reason ->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [UdpOptions, Reason])),
print_debug_info(Config, daemon, open, ?ERROR(open, undef, Text, "")),
exit({gen_udp_open, UdpOptions, Reason})
end.
prepare_daemon_udp(#config{udp_port = Port, udp_options = UdpOptions} = Config) ->
case lists:keymember(fd, 1, UdpOptions) of
true ->
%% Use explicit fd
{Port, UdpOptions};
false ->
%% Use fd from setuid_socket_wrap, such as -tftpd_69
InitArg = list_to_atom("tftpd_" ++ integer_to_list(Port)),
case init:get_argument(InitArg) of
{ok, [[FdStr]] = Badarg} when is_list(FdStr) ->
case catch list_to_integer(FdStr) of
Fd when is_integer(Fd) ->
{0, [{fd, Fd} | lists:keydelete(ip, 1, UdpOptions)]};
{'EXIT', _} ->
Text = lists:flatten(io_lib:format("Illegal prebound fd ~p: ~p", [InitArg, Badarg])),
print_debug_info(Config, daemon, open, ?ERROR(open, undef, Text, "")),
exit({badarg, {prebound_fd, InitArg, Badarg}})
end;
{ok, Badarg} ->
Text = lists:flatten(io_lib:format("Illegal prebound fd ~p: ~p", [InitArg, Badarg])),
print_debug_info(Config, daemon, open, ?ERROR(open, undef, Text, "")),
exit({badarg, {prebound_fd, InitArg, Badarg}});
error ->
{Port, UdpOptions}
end
end.
daemon_loop(DaemonConfig, N, Servers) when is_list(Servers) ->
%% Handle upgrade from old releases. Please, remove this function in next release.
ServerTab = ets:new(tftp_daemon_servers, [{keypos, 2}]),
FileTab = ets:new(tftp_daemon_files, [{keypos, 2}]),
State = #daemon_state{config = DaemonConfig,
n_servers = N,
server_tab = ServerTab,
file_tab = FileTab},
Req = #tftp_msg_req{filename = dummy},
[ets:insert(ServerTab, #server_info{pid = Pid, req = Req, peer = dummy}) || Pid <- Servers],
daemon_loop(State).
daemon_loop(#daemon_state{config = DaemonConfig,
n_servers = N,
server_tab = ServerTab,
file_tab = FileTab} = State) when is_record(DaemonConfig, config) ->
%% info_msg(DaemonConfig, "=====> TFTP: Daemon #~p\n", [N]), %% XXX
receive
{info, Ref, FromPid} when is_pid(FromPid) ->
Fun = fun(#server_info{pid = Pid}, Acc) -> [{server, Pid} | Acc] end,
ServerInfo = ets:foldl(Fun, [], ServerTab),
Info = internal_info(DaemonConfig, daemon) ++ [{n_conn, N}] ++ ServerInfo,
reply({ok, Info}, Ref, FromPid),
?MODULE:daemon_loop(State);
{{change_config, Options}, Ref, FromPid} when is_pid(FromPid) ->
case catch tftp_lib:parse_config(Options, DaemonConfig) of
{'EXIT', Reason} ->
reply({error, Reason}, Ref, FromPid),
?MODULE:daemon_loop(State);
DaemonConfig2 when is_record(DaemonConfig2, config) ->
reply(ok, Ref, FromPid),
?MODULE:daemon_loop(State#daemon_state{config = DaemonConfig2})
end;
{udp, Socket, RemoteHost, RemotePort, Bin} when is_binary(Bin) ->
inet:setopts(Socket, [{active, once}]),
ServerConfig = DaemonConfig#config{parent_pid = self(),
udp_host = RemoteHost,
udp_port = RemotePort},
Msg = (catch tftp_lib:decode_msg(Bin)),
print_debug_info(ServerConfig, daemon, recv, Msg),
case Msg of
Req when is_record(Req, tftp_msg_req),
N =< DaemonConfig#config.max_conn ->
Peer = peer_info(ServerConfig),
PeerReq = {Peer, Req},
PeerInfo = lists:flatten(io_lib:format("~p", [Peer])),
case ets:lookup(FileTab, PeerReq) of
[] ->
Args = [ServerConfig, Req],
Pid = proc_lib:spawn_link(?MODULE, server_init, Args),
ets:insert(ServerTab, #server_info{pid = Pid, req = Req, peer = Peer}),
ets:insert(FileTab, #file_info{peer_req = PeerReq, pid = Pid}),
?MODULE:daemon_loop(State#daemon_state{n_servers = N + 1});
[#file_info{pid = Pid}] ->
%% Yet another request of the file from same peer
warning_msg(DaemonConfig, "~p Reuse connection for ~s\n\t~p\n",
[Pid, PeerInfo, Req#tftp_msg_req.filename]),
?MODULE:daemon_loop(State)
end;
Req when is_record(Req, tftp_msg_req) ->
Reply = #tftp_msg_error{code = enospc, text = "Too many connections"},
Peer = peer_info(ServerConfig),
PeerInfo = lists:flatten(io_lib:format("~p", [Peer])),
warning_msg(DaemonConfig,
"Daemon has too many connections (~p)."
"\n\tRejecting request from ~s\n",
[N, PeerInfo]),
send_msg(ServerConfig, daemon, Reply),
?MODULE:daemon_loop(State);
{'EXIT', Reply} when is_record(Reply, tftp_msg_error) ->
send_msg(ServerConfig, daemon, Reply),
?MODULE:daemon_loop(State);
Req ->
Reply = #tftp_msg_error{code = badop,
text = "Illegal TFTP operation"},
warning_msg(DaemonConfig, "Daemon received: ~p.\n\tfrom ~p:~p",
[Req, RemoteHost, RemotePort]),
send_msg(ServerConfig, daemon, Reply),
?MODULE:daemon_loop(State)
end;
{system, From, Msg} ->
Misc = #sys_misc{module = ?MODULE, function = daemon_loop, arguments = [State]},
sys:handle_system_msg(Msg, From, DaemonConfig#config.parent_pid, ?MODULE, [], Misc);
{'EXIT', Pid, Reason} when DaemonConfig#config.parent_pid =:= Pid ->
close_port(DaemonConfig, daemon, #tftp_msg_req{filename = ""}),
exit(Reason);
{'EXIT', Pid, _Reason} = Info ->
case ets:lookup(ServerTab, Pid) of
[] ->
warning_msg(DaemonConfig, "Daemon received: ~p", [Info]),
?MODULE:daemon_loop(State);
[#server_info{req = Req, peer = Peer}] ->
PeerReq = {Peer, Req},
ets:delete(FileTab, PeerReq),
ets:delete(ServerTab, Pid),
?MODULE:daemon_loop(State#daemon_state{n_servers = N - 1})
end;
Info ->
warning_msg(DaemonConfig, "Daemon received: ~p", [Info]),
?MODULE:daemon_loop(State)
end;
daemon_loop(#daemon_state{config = Config} = State) ->
%% Handle upgrade from old releases. Please, remove this clause in next release.
Config2 = upgrade_config(Config),
daemon_loop(State#daemon_state{config = Config2}).
upgrade_config({config, ParentPid, UdpSocket, UdpOptions, UdpHost, UdpPort, PortPolicy,
UseTsize, MaxTsize, MaxConn, Rejected, PoliteAck, DebugLevel,
Timeout, UserOptions, Callbacks}) ->
Callbacks2 = tftp_lib:add_default_callbacks(Callbacks),
Logger = tftp_logger,
MaxRetries = 5,
{config, ParentPid, UdpSocket, UdpOptions, UdpHost, UdpPort, PortPolicy,
UseTsize, MaxTsize, MaxConn, Rejected, PoliteAck, DebugLevel,
Timeout, UserOptions, Callbacks2, Logger, MaxRetries}.
%%%-------------------------------------------------------------------
%%% Server
%%%-------------------------------------------------------------------
server_init(Config, Req) when is_record(Config, config),
is_pid(Config#config.parent_pid),
is_record(Req, tftp_msg_req) ->
process_flag(trap_exit, true),
%% Config =
%% case os:getenv("TFTPDEBUG") of
%% false ->
%% Config0;
%% DebugLevel ->
%% Config0#config{debug_level = list_to_atom(DebugLevel)}
%% end,
SuggestedOptions = Req#tftp_msg_req.options,
UdpOptions = Config#config.udp_options,
UdpOptions2 = lists:keydelete(fd, 1, UdpOptions),
Config1 = Config#config{udp_options = UdpOptions2},
Config2 = tftp_lib:parse_config(SuggestedOptions, Config1),
SuggestedOptions2 = Config2#config.user_options,
Req2 = Req#tftp_msg_req{options = SuggestedOptions2},
case open_free_port(Config2, server, Req2) of
{ok, Config3} ->
Filename = Req#tftp_msg_req.filename,
case match_callback(Filename, Config3#config.callbacks) of
{ok, Callback} ->
print_debug_info(Config3, server, match, Callback),
case pre_verify_options(Config3, Req2) of
ok ->
case callback({open, server_open}, Config3, Callback, Req2) of
{Callback2, {ok, AcceptedOptions}} ->
{LocalAccess, _} = local_file_access(Req2),
OptText = "Internal error. Not allowed to add new options.",
case post_verify_options(Config3, Req2, AcceptedOptions, OptText) of
{ok, Config4, Req3} when AcceptedOptions =/= [] ->
Reply = #tftp_msg_oack{options = AcceptedOptions},
BlockNo =
case LocalAccess of
read -> 0;
write -> 1
end,
{Config5, Callback3, TransferRes} =
transfer(Config4, Callback2, Req3, Reply, LocalAccess, BlockNo, #prepared{}),
common_loop(Config5, Callback3, Req3, TransferRes, LocalAccess, BlockNo);
{ok, Config4, Req3} when LocalAccess =:= write ->
BlockNo = 0,
common_ack(Config4, Callback2, Req3, LocalAccess, BlockNo, #prepared{});
{ok, Config4, Req3} when LocalAccess =:= read ->
BlockNo = 0,
common_read(Config4, Callback2, Req3, LocalAccess, BlockNo, BlockNo, #prepared{});
{error, {Code, Text}} ->
{undefined, Error} =
callback({abort, {Code, Text}}, Config3, Callback2, Req2),
send_msg(Config3, Req, Error),
terminate(Config3, Req2, ?ERROR(post_verify_options, Code, Text, Req2#tftp_msg_req.filename))
end;
{undefined, #tftp_msg_error{code = Code, text = Text} = Error} ->
send_msg(Config3, Req, Error),
terminate(Config3, Req, ?ERROR(server_open, Code, Text, Req2#tftp_msg_req.filename))
end;
{error, {Code, Text}} ->
{undefined, Error} =
callback({abort, {Code, Text}}, Config2, Callback, Req2),
send_msg(Config2, Req, Error),
terminate(Config2, Req2, ?ERROR(pre_verify_options, Code, Text, Req2#tftp_msg_req.filename))
end;
{error, #tftp_msg_error{code = Code, text = Text} = Error} ->
send_msg(Config3, Req, Error),
terminate(Config3, Req, ?ERROR(match_callback, Code, Text, Req2#tftp_msg_req.filename))
end;
#error{} = Error ->
terminate(Config2, Req, Error)
end;
server_init(Config, Req) when is_record(Req, tftp_msg_req) ->
Config2 = upgrade_config(Config),
server_init(Config2, Req).
%%%-------------------------------------------------------------------
%%% Client
%%%-------------------------------------------------------------------
%% LocalFilename = filename() | 'binary' | binary()
%% Returns {ok, LastCallbackState} | {error, Reason}
client_start(Access, RemoteFilename, LocalFilename, Options) ->
Config = tftp_lib:parse_config(Options),
Config2 = Config#config{parent_pid = self(),
udp_socket = undefined},
Req = #tftp_msg_req{access = Access,
filename = RemoteFilename,
mode = lookup_mode(Config2#config.user_options),
options = Config2#config.user_options,
local_filename = LocalFilename},
Args = [Config2, Req],
case proc_lib:start_link(?MODULE, client_init, Args, infinity) of
{ok, LastCallbackState} ->
{ok, LastCallbackState};
{error, Error} ->
{error, Error}
end.
client_init(Config, Req) when is_record(Config, config),
is_pid(Config#config.parent_pid),
is_record(Req, tftp_msg_req) ->
process_flag(trap_exit, true),
%% Config =
%% case os:getenv("TFTPDEBUG") of
%% false ->
%% Config0;
%% "none" ->
%% Config0;
%% DebugLevel ->
%% info_msg(Config, "TFTPDEBUG: ~s\n", [DebugLevel]),
%% Config0#config{debug_level = list_to_atom(DebugLevel)}
%% end,
case open_free_port(Config, client, Req) of
{ok, Config2} ->
Req2 =
case Config2#config.use_tsize of
true ->
SuggestedOptions = Req#tftp_msg_req.options,
SuggestedOptions2 = tftp_lib:replace_val("tsize", "0", SuggestedOptions),
Req#tftp_msg_req{options = SuggestedOptions2};
false ->
Req
end,
LocalFilename = Req2#tftp_msg_req.local_filename,
case match_callback(LocalFilename, Config2#config.callbacks) of
{ok, Callback} ->
print_debug_info(Config2, client, match, Callback),
client_prepare(Config2, Callback, Req2);
{error, #tftp_msg_error{code = Code, text = Text}} ->
terminate(Config, Req, ?ERROR(match, Code, Text, Req#tftp_msg_req.filename))
end;
#error{} = Error ->
terminate(Config, Req, Error)
end.
client_prepare(Config, Callback, Req) when is_record(Req, tftp_msg_req) ->
case pre_verify_options(Config, Req) of
ok ->
case callback({open, client_prepare}, Config, Callback, Req) of
{Callback2, {ok, AcceptedOptions}} ->
OptText = "Internal error. Not allowed to add new options.",
case post_verify_options(Config, Req, AcceptedOptions, OptText) of
{ok, Config2, Req2} ->
{LocalAccess, _} = local_file_access(Req2),
BlockNo = 0,
{Config3, Callback3, TransferRes} =
transfer(Config2, Callback2, Req2, Req2, LocalAccess, BlockNo, #prepared{}),
client_open(Config3, Callback3, Req2, BlockNo, TransferRes);
{error, {Code, Text}} ->
callback({abort, {Code, Text}}, Config, Callback2, Req),
terminate(Config, Req, ?ERROR(post_verify_options, Code, Text, Req#tftp_msg_req.filename))
end;
{undefined, #tftp_msg_error{code = Code, text = Text}} ->
terminate(Config, Req, ?ERROR(client_prepare, Code, Text, Req#tftp_msg_req.filename))
end;
{error, {Code, Text}} ->
callback({abort, {Code, Text}}, Config, Callback, Req),
terminate(Config, Req, ?ERROR(pre_verify_options, Code, Text, Req#tftp_msg_req.filename))
end.
client_open(Config, Callback, Req, BlockNo, #transfer_res{status = Status, decoded_msg = DecodedMsg, prepared = Prepared}) ->
{LocalAccess, _} = local_file_access(Req),
case Status of
ok when is_record(Prepared, prepared) ->
case DecodedMsg of
Msg when is_record(Msg, tftp_msg_oack) ->
ServerOptions = Msg#tftp_msg_oack.options,
OptText = "Protocol violation. Server is not allowed new options",
case post_verify_options(Config, Req, ServerOptions, OptText) of
{ok, Config2, Req2} ->
{Config3, Callback2, Req3} =
do_client_open(Config2, Callback, Req2),
case LocalAccess of
read ->
common_read(Config3, Callback2, Req3, LocalAccess, BlockNo, BlockNo, Prepared);
write ->
common_ack(Config3, Callback2, Req3, LocalAccess, BlockNo, Prepared)
end;
{error, {Code, Text}} ->
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(verify_server_options, Code, Text, Req#tftp_msg_req.filename))
end;
#tftp_msg_ack{block_no = ActualBlockNo} when LocalAccess =:= read ->
Req2 = Req#tftp_msg_req{options = []},
{Config2, Callback2, Req2} = do_client_open(Config, Callback, Req2),
ExpectedBlockNo = 0,
common_read(Config2, Callback2, Req2, LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared);
#tftp_msg_data{block_no = ActualBlockNo, data = Data} when LocalAccess =:= write ->
Req2 = Req#tftp_msg_req{options = []},
{Config2, Callback2, Req2} = do_client_open(Config, Callback, Req2),
ExpectedBlockNo = 1,
common_write(Config2, Callback2, Req2, LocalAccess, ExpectedBlockNo, ActualBlockNo, Data, Prepared);
%% #tftp_msg_error{code = Code, text = Text} when Req#tftp_msg_req.options =/= [] ->
%% %% Retry without options
%% callback({abort, {Code, Text}}, Config, Callback, Req),
%% Req2 = Req#tftp_msg_req{options = []},
%% client_prepare(Config, Callback, Req2);
#tftp_msg_error{code = Code, text = Text} ->
callback({abort, {Code, Text}}, Config, Callback, Req),
terminate(Config, Req, ?ERROR(client_open, Code, Text, Req#tftp_msg_req.filename));
{'EXIT', #tftp_msg_error{code = Code, text = Text}} ->
callback({abort, {Code, Text}}, Config, Callback, Req),
terminate(Config, Req, ?ERROR(client_open, Code, Text, Req#tftp_msg_req.filename));
Msg when is_tuple(Msg) ->
Code = badop,
Text = "Illegal TFTP operation",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
Text2 = lists:flatten([Text, ". ", io_lib:format("~p", [element(1, Msg)])]),
terminate(Config, Req, ?ERROR(client_open, Code, Text2, Req#tftp_msg_req.filename))
end;
error when is_record(Prepared, tftp_msg_error) ->
#tftp_msg_error{code = Code, text = Text} = Prepared,
callback({abort, {Code, Text}}, Config, Callback, Req),
terminate(Config, Req, ?ERROR(client_open, Code, Text, Req#tftp_msg_req.filename))
end.
do_client_open(Config, Callback, Req) ->
case callback({open, client_open}, Config, Callback, Req) of
{Callback2, {ok, FinalOptions}} ->
OptText = "Internal error. Not allowed to change options.",
case post_verify_options(Config, Req, FinalOptions, OptText) of
{ok, Config2, Req2} ->
{Config2, Callback2, Req2};
{error, {Code, Text}} ->
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback2, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(post_verify_options, Code, Text, Req#tftp_msg_req.filename))
end;
{undefined, #tftp_msg_error{code = Code, text = Text} = Error} ->
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(client_open, Code, Text, Req#tftp_msg_req.filename))
end.
%%%-------------------------------------------------------------------
%%% Common loop for both client and server
%%%-------------------------------------------------------------------
common_loop(Config, Callback, Req, #transfer_res{status = Status, decoded_msg = DecodedMsg, prepared = Prepared}, LocalAccess, ExpectedBlockNo)
when is_record(Config, config)->
%% Config =
%% case os:getenv("TFTPMAX") of
%% false ->
%% Config0;
%% MaxBlockNoStr when Config0#config.debug_level =/= none ->
%% case list_to_integer(MaxBlockNoStr) of
%% MaxBlockNo when ExpectedBlockNo > MaxBlockNo ->
%% info_msg(Config, "TFTPMAX: ~p\n", [MaxBlockNo]),
%% info_msg(Config, "TFTPDEBUG: none\n", []),
%% Config0#config{debug_level = none};
%% _ ->
%% Config0
%% end;
%% _MaxBlockNoStr ->
%% Config0
%% end,
case Status of
ok when is_record(Prepared, prepared) ->
case DecodedMsg of
#tftp_msg_ack{block_no = ActualBlockNo} when LocalAccess =:= read ->
common_read(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared);
#tftp_msg_data{block_no = ActualBlockNo, data = Data} when LocalAccess =:= write ->
common_write(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Data, Prepared);
#tftp_msg_error{code = Code, text = Text} ->
callback({abort, {Code, Text}}, Config, Callback, Req),
terminate(Config, Req, ?ERROR(common_loop, Code, Text, Req#tftp_msg_req.filename));
{'EXIT', #tftp_msg_error{code = Code, text = Text} = Error} ->
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(common_loop, Code, Text, Req#tftp_msg_req.filename));
Msg when is_tuple(Msg) ->
Code = badop,
Text = "Illegal TFTP operation",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
Text2 = lists:flatten([Text, ". ", io_lib:format("~p", [element(1, Msg)])]),
terminate(Config, Req, ?ERROR(common_loop, Code, Text2, Req#tftp_msg_req.filename))
end;
error when is_record(Prepared, tftp_msg_error) ->
#tftp_msg_error{code = Code, text = Text} = Prepared,
send_msg(Config, Req, Prepared),
terminate(Config, Req, ?ERROR(transfer, Code, Text, Req#tftp_msg_req.filename))
end;
common_loop(Config, Callback, Req, TransferRes, LocalAccess, ExpectedBlockNo) ->
%% Handle upgrade from old releases. Please, remove this clause in next release.
Config2 = upgrade_config(Config),
common_loop(Config2, Callback, Req, TransferRes, LocalAccess, ExpectedBlockNo).
-spec common_read(#config{}, #callback{}, _, 'read', _, _, #prepared{}) -> no_return().
common_read(Config, _, Req, _, _, _, #prepared{status = terminate, result = Result}) ->
terminate(Config, Req, {ok, Result});
common_read(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared)
when ActualBlockNo =:= ExpectedBlockNo, is_record(Prepared, prepared) ->
case early_read(Config, Callback, Req, LocalAccess, ActualBlockNo, Prepared) of
{Callback2, #prepared{status = more, next_data = Data} = Prepared2} when is_binary(Data) ->
Prepared3 = Prepared2#prepared{prev_data = Data, next_data = undefined},
do_common_read(Config, Callback2, Req, LocalAccess, ActualBlockNo, Data, Prepared3);
{undefined, #prepared{status = last, next_data = Data} = Prepared2} when is_binary(Data) ->
Prepared3 = Prepared2#prepared{status = terminate},
do_common_read(Config, undefined, Req, LocalAccess, ActualBlockNo, Data, Prepared3);
{undefined, #prepared{status = error, result = Error}} ->
#tftp_msg_error{code = Code, text = Text} = Error,
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
end;
common_read(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared)
when ActualBlockNo =:= (ExpectedBlockNo - 1), is_record(Prepared, prepared) ->
case Prepared of
#prepared{status = more, prev_data = Data} when is_binary(Data) ->
do_common_read(Config, Callback, Req, LocalAccess, ActualBlockNo, Data, Prepared);
#prepared{status = last, prev_data = Data} when is_binary(Data) ->
do_common_read(Config, Callback, Req, LocalAccess, ActualBlockNo, Data, Prepared);
#prepared{status = error, result = Error} ->
#tftp_msg_error{code = Code, text = Text} = Error,
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
end;
common_read(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared)
when ActualBlockNo =< ExpectedBlockNo, is_record(Prepared, prepared) ->
%% error_logger:error_msg("TFTP READ ~s: Expected block ~p but got block ~p - IGNORED\n",
%% [Req#tftp_msg_req.filename, ExpectedBlockNo, ActualBlockNo]),
case Prepared of
#prepared{status = more, prev_data = Data} when is_binary(Data) ->
Reply = #tftp_msg_data{block_no = ExpectedBlockNo, data = Data},
{Config2, Callback2, TransferRes} =
wait_for_msg_and_handle_timeout(Config, Callback, Req, Reply, LocalAccess, ExpectedBlockNo, Prepared),
?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, ExpectedBlockNo);
#prepared{status = last, prev_data = Data} when is_binary(Data) ->
Reply = #tftp_msg_data{block_no = ExpectedBlockNo, data = Data},
{Config2, Callback2, TransferRes} =
wait_for_msg_and_handle_timeout(Config, Callback, Req, Reply, LocalAccess, ExpectedBlockNo, Prepared),
?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, ExpectedBlockNo);
#prepared{status = error, result = Error} ->
#tftp_msg_error{code = Code, text = Text} = Error,
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
end;
common_read(Config, Callback, Req, _LocalAccess, ExpectedBlockNo, ActualBlockNo, Prepared)
when is_record(Prepared, prepared) ->
Code = badblk,
Text = "Unknown transfer ID = " ++
integer_to_list(ActualBlockNo) ++ " (" ++ integer_to_list(ExpectedBlockNo) ++ ")",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename)).
-spec do_common_read(#config{}, #callback{} | undefined, _, 'read', integer(), binary(), #prepared{}) -> no_return().
do_common_read(Config, Callback, Req, LocalAccess, BlockNo, Data, Prepared)
when is_binary(Data), is_record(Prepared, prepared) ->
NextBlockNo = BlockNo + 1,
case NextBlockNo =< 65535 of
true ->
Reply = #tftp_msg_data{block_no = NextBlockNo, data = Data},
{Config2, Callback2, TransferRes} =
transfer(Config, Callback, Req, Reply, LocalAccess, NextBlockNo, Prepared),
?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo);
false ->
Code = badblk,
Text = "Too big transfer ID = " ++
integer_to_list(NextBlockNo) ++ " > 65535",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
end.
-spec common_write(#config{}, #callback{}, _, 'write', integer(), integer(), _, #prepared{}) -> no_return().
common_write(Config, _, Req, _, _, _, _, #prepared{status = terminate, result = Result}) ->
terminate(Config, Req, {ok, Result});
common_write(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Data, Prepared)
when ActualBlockNo =:= ExpectedBlockNo, is_binary(Data), is_record(Prepared, prepared) ->
case callback({write, Data}, Config, Callback, Req) of
{Callback2, #prepared{status = more} = Prepared2} ->
common_ack(Config, Callback2, Req, LocalAccess, ActualBlockNo, Prepared2);
{undefined, #prepared{status = last, result = Result} = Prepared2} ->
Config2 = pre_terminate(Config, Req, {ok, Result}),
Prepared3 = Prepared2#prepared{status = terminate},
common_ack(Config2, undefined, Req, LocalAccess, ActualBlockNo, Prepared3);
{undefined, #prepared{status = error, result = Error}} ->
#tftp_msg_error{code = Code, text = Text} = Error,
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(write, Code, Text, Req#tftp_msg_req.filename))
end;
common_write(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Data, Prepared)
when ActualBlockNo =:= (ExpectedBlockNo - 1), is_binary(Data), is_record(Prepared, prepared) ->
common_ack(Config, Callback, Req, LocalAccess, ExpectedBlockNo - 1, Prepared);
common_write(Config, Callback, Req, LocalAccess, ExpectedBlockNo, ActualBlockNo, Data, Prepared)
when ActualBlockNo =< ExpectedBlockNo, is_binary(Data), is_record(Prepared, prepared) ->
%% error_logger:error_msg("TFTP WRITE ~s: Expected block ~p but got block ~p - IGNORED\n",
%% [Req#tftp_msg_req.filename, ExpectedBlockNo, ActualBlockNo]),
Reply = #tftp_msg_ack{block_no = ExpectedBlockNo},
{Config2, Callback2, TransferRes} =
wait_for_msg_and_handle_timeout(Config, Callback, Req, Reply, LocalAccess, ExpectedBlockNo, Prepared),
?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, ExpectedBlockNo);
common_write(Config, Callback, Req, _, ExpectedBlockNo, ActualBlockNo, Data, Prepared)
when is_binary(Data), is_record(Prepared, prepared) ->
Code = badblk,
Text = "Unknown transfer ID = " ++
integer_to_list(ActualBlockNo) ++ " (" ++ integer_to_list(ExpectedBlockNo) ++ ")",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(write, Code, Text, Req#tftp_msg_req.filename)).
common_ack(Config, Callback, Req, LocalAccess, BlockNo, Prepared)
when is_record(Prepared, prepared) ->
Reply = #tftp_msg_ack{block_no = BlockNo},
NextBlockNo = BlockNo + 1,
{Config2, Callback2, TransferRes} =
transfer(Config, Callback, Req, Reply, LocalAccess, NextBlockNo, Prepared),
case NextBlockNo =< 65535 of
true ->
?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo);
false ->
Code = badblk,
Text = "Too big transfer ID = " ++
integer_to_list(NextBlockNo) ++ " > 65535",
{undefined, Error} =
callback({abort, {Code, Text}}, Config, Callback2, Req),
send_msg(Config, Req, Error),
terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
end.
pre_terminate(Config, Req, Result) ->
if
Req#tftp_msg_req.local_filename =/= undefined,
Config#config.parent_pid =/= undefined ->
proc_lib:init_ack(Result),
unlink(Config#config.parent_pid),
Config#config{parent_pid = undefined, polite_ack = true};
true ->
Config#config{polite_ack = true}
end.
-spec terminate(#config{}, #tftp_msg_req{}, {'ok', _} | #error{}) -> no_return().
terminate(Config, Req, Result) ->
Result2 =
case Result of
{ok, _} ->
Result;
#error{where = Where, code = Code, text = Text} = Error ->
print_debug_info(Config, Req, Where, Error#error{filename = Req#tftp_msg_req.filename}),
{error, {Where, Code, Text}}
end,
if
Config#config.parent_pid =:= undefined ->
close_port(Config, client, Req),
exit(normal);
Req#tftp_msg_req.local_filename =/= undefined ->
%% Client
close_port(Config, client, Req),
proc_lib:init_ack(Result2),
unlink(Config#config.parent_pid),
exit(normal);
true ->
%% Server
close_port(Config, server, Req),
exit(shutdown)
end.
close_port(Config, Who, Req) when is_record(Req, tftp_msg_req) ->
case Config#config.udp_socket of
undefined ->
ignore;
Socket ->
print_debug_info(Config, Who, close, Req),
gen_udp:close(Socket)
end.
open_free_port(Config, Who, Req) when is_record(Config, config), is_record(Req, tftp_msg_req) ->
UdpOptions = Config#config.udp_options,
case Config#config.port_policy of
random ->
%% BUGBUG: Should be a random port
case catch gen_udp:open(0, UdpOptions) of
{ok, Socket} ->
Config2 = Config#config{udp_socket = Socket},
print_debug_info(Config2, Who, open, Req),
{ok, Config2};
{error, Reason} ->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [[0 | UdpOptions], Reason])),
?ERROR(open, undef, Text, Req#tftp_msg_req.filename);
{'EXIT', _} = Reason ->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [[0 | UdpOptions], Reason])),
?ERROR(open, undef, Text, Req#tftp_msg_req.filename)
end;
{range, Port, Max} when Port =< Max ->
case catch gen_udp:open(Port, UdpOptions) of
{ok, Socket} ->
Config2 = Config#config{udp_socket = Socket},
print_debug_info(Config2, Who, open, Req),
{ok, Config2};
{error, eaddrinuse} ->
PortPolicy = {range, Port + 1, Max},
Config2 = Config#config{port_policy = PortPolicy},
open_free_port(Config2, Who, Req);
{error, Reason} ->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [[Port | UdpOptions], Reason])),
?ERROR(open, undef, Text, Req#tftp_msg_req.filename);
{'EXIT', _} = Reason->
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [[Port | UdpOptions], Reason])),
?ERROR(open, undef, Text, Req#tftp_msg_req.filename)
end;
{range, Port, _Max} ->
Reason = "Port range exhausted",
Text = lists:flatten(io_lib:format("UDP open ~p -> ~p", [[Port | UdpOptions], Reason])),
?ERROR(Who, undef, Text, Req#tftp_msg_req.filename)
end.
%%-------------------------------------------------------------------
%% Transfer
%%-------------------------------------------------------------------
%% Returns {Config, Callback, #transfer_res{}}
transfer(Config, Callback, Req, Msg, LocalAccess, NextBlockNo, Prepared)
when is_record(Prepared, prepared) ->
IoList = tftp_lib:encode_msg(Msg),
Retries = Config#config.max_retries + 1,
do_transfer(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries).
do_transfer(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries)
when is_record(Prepared, prepared), is_integer(Retries), Retries >= 0 ->
case do_send_msg(Config, Req, Msg, IoList) of
ok ->
{Callback2, Prepared2} =
early_read(Config, Callback, Req, LocalAccess, NextBlockNo, Prepared),
do_wait_for_msg_and_handle_timeout(Config, Callback2, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared2, Retries);
{error, _Reason} when Retries > 0 ->
Retries2 = 0, % Just retry once when send fails
do_transfer(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries2);
{error, Reason} ->
Code = undef,
Text = lists:flatten(io_lib:format("Transfer failed - giving up -> ~p", [Reason])),
Error = #tftp_msg_error{code = Code, text = Text},
{Config, Callback, #transfer_res{status = error, prepared = Error}}
end.
wait_for_msg_and_handle_timeout(Config, Callback, Req, Msg, LocalAccess, NextBlockNo, Prepared) ->
IoList = tftp_lib:encode_msg(Msg),
Retries = Config#config.max_retries + 1,
do_wait_for_msg_and_handle_timeout(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries).
do_wait_for_msg_and_handle_timeout(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries) ->
Code = undef,
Text = "Transfer timed out.",
case wait_for_msg(Config, Callback, Req) of
timeout when Config#config.polite_ack =:= true ->
do_send_msg(Config, Req, Msg, IoList),
case Prepared of
#prepared{status = terminate, result = Result} ->
terminate(Config, Req, {ok, Result});
#prepared{} ->
terminate(Config, Req, ?ERROR(transfer, Code, Text, Req#tftp_msg_req.filename))
end;
timeout when Retries > 0 ->
Retries2 = Retries - 1,
do_transfer(Config, Callback, Req, Msg, IoList, LocalAccess, NextBlockNo, Prepared, Retries2);
timeout ->
Error = #tftp_msg_error{code = Code, text = Text},
{Config, Callback, #transfer_res{status = error, prepared = Error}};
{Config2, DecodedMsg} ->
{Config2, Callback, #transfer_res{status = ok, decoded_msg = DecodedMsg, prepared = Prepared}}
end.
send_msg(Config, Req, Msg) ->
case catch tftp_lib:encode_msg(Msg) of
{'EXIT', Reason} ->
Code = undef,
Text = "Internal error. Encode failed",
Msg2 = #tftp_msg_error{code = Code, text = Text, details = Reason},
send_msg(Config, Req, Msg2);
IoList ->
do_send_msg(Config, Req, Msg, IoList)
end.
do_send_msg(#config{udp_socket = Socket, udp_host = RemoteHost, udp_port = RemotePort} = Config, Req, Msg, IoList) ->
%% {ok, LocalPort} = inet:port(Socket),
%% if
%% LocalPort =/= ?TFTP_DEFAULT_PORT ->
%% ok;
%% true ->
%% print_debug_info(Config#config{debug_level = all}, Req, send, Msg),
%% error(Config,
%% "Daemon replies from the default port (~p)\n\t to ~p:~p\n\t¨~p\n",
%% [LocalPort, RemoteHost, RemotePort, Msg])
%% end,
print_debug_info(Config, Req, send, Msg),
%% case os:getenv("TFTPDUMP") of
%% false ->
%% ignore;
%% DumpPath ->
%% trace_udp_send(Req, Msg, IoList, DumpPath)
%% end,
Res = gen_udp:send(Socket, RemoteHost, RemotePort, IoList),
case Res of
ok ->
ok;
{error, einval = Reason} ->
error_msg(Config,
"Stacktrace; ~p\n gen_udp:send(~p, ~p, ~p, ~p) -> ~p\n",
[erlang:get_stacktrace(), Socket, RemoteHost, RemotePort, IoList, {error, Reason}]);
{error, Reason} ->
{error, Reason}
end.
%% trace_udp_send(#tftp_msg_req{filename = [$/ | RelFile]} = Req, Msg, IoList, DumpPath) ->
%% trace_udp_send(Req#tftp_msg_req{filename = RelFile}, Msg, IoList, DumpPath);
%% trace_udp_send(#tftp_msg_req{filename = RelFile},
%% #tftp_msg_data{block_no = BlockNo, data = Data},
%% _IoList,
%% DumpPath) ->
%% File = filename:join([DumpPath, RelFile, "block" ++ string:right(integer_to_list(BlockNo), 5, $0) ++ ".dump"]),
%% if
%% (BlockNo rem 1000) =:= 1 ->
%% info_msg(Config, "TFTPDUMP: Data ~s\n", [File]);
%% true ->
%% ignore
%% end,
%% ok = filelib:ensure_dir(File),
%% ok = file:write_file(File, Data);
%% trace_udp_send(#tftp_msg_req{filename = RelFile}, Msg, _IoList, _DumpPath) ->
%% info_msg(Config, "TFTPDUMP: No data ~s -> ~p\n", [RelFile, element(1, Msg)]).
wait_for_msg(Config, Callback, Req) ->
receive
{udp, Socket, RemoteHost, RemotePort, Bin}
when is_binary(Bin), Callback#callback.block_no =:= undefined ->
%% Client prepare
inet:setopts(Socket, [{active, once}]),
Config2 = Config#config{udp_host = RemoteHost,
udp_port = RemotePort},
DecodedMsg = (catch tftp_lib:decode_msg(Bin)),
print_debug_info(Config2, Req, recv, DecodedMsg),
{Config2, DecodedMsg};
{udp, Socket, Host, Port, Bin} when is_binary(Bin),
Config#config.udp_host =:= Host,
Config#config.udp_port =:= Port ->
inet:setopts(Socket, [{active, once}]),
DecodedMsg = (catch tftp_lib:decode_msg(Bin)),
print_debug_info(Config, Req, recv, DecodedMsg),
{Config, DecodedMsg};
{info, Ref, FromPid} when is_pid(FromPid) ->
Type =
case Req#tftp_msg_req.local_filename =/= undefined of
true -> client;
false -> server
end,
Info = internal_info(Config, Type),
reply({ok, Info}, Ref, FromPid),
wait_for_msg(Config, Callback, Req);
{{change_config, Options}, Ref, FromPid} when is_pid(FromPid) ->
case catch tftp_lib:parse_config(Options, Config) of
{'EXIT', Reason} ->
reply({error, Reason}, Ref, FromPid),
wait_for_msg(Config, Callback, Req);
Config2 when is_record(Config2, config) ->
reply(ok, Ref, FromPid),
wait_for_msg(Config2, Callback, Req)
end;
{system, From, Msg} ->
Misc = #sys_misc{module = ?MODULE, function = wait_for_msg, arguments = [Config, Callback, Req]},
sys:handle_system_msg(Msg, From, Config#config.parent_pid, ?MODULE, [], Misc);
{'EXIT', Pid, _Reason} when Config#config.parent_pid =:= Pid ->
Code = undef,
Text = "Parent exited.",
terminate(Config, Req, ?ERROR(wait_for_msg, Code, Text, Req#tftp_msg_req.filename));
Msg when Req#tftp_msg_req.local_filename =/= undefined ->
warning_msg(Config, "Client received : ~p", [Msg]),
wait_for_msg(Config, Callback, Req);
Msg when Req#tftp_msg_req.local_filename =:= undefined ->
warning_msg(Config, "Server received : ~p", [Msg]),
wait_for_msg(Config, Callback, Req)
after Config#config.timeout * 1000 ->
print_debug_info(Config, Req, recv, timeout),
timeout
end.
early_read(Config, Callback, Req, LocalAccess, _NextBlockNo,
#prepared{status = Status, next_data = NextData, prev_data = PrevData} = Prepared) ->
if
Status =/= terminate,
LocalAccess =:= read,
Callback#callback.block_no =/= undefined,
NextData =:= undefined ->
case callback(read, Config, Callback, Req) of
{undefined, Error} when is_record(Error, tftp_msg_error) ->
{undefined, Error};