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%% Copyright (c) 2010, Michael Santos <michael.santos@gmail.com>
%% All rights reserved.
%%
%% Redistribution and use in source and binary forms, with or without
%% modification, are permitted provided that the following conditions
%% are met:
%%
%% Redistributions of source code must retain the above copyright
%% notice, this list of conditions and the following disclaimer.
%%
%% Redistributions in binary form must reproduce the above copyright
%% notice, this list of conditions and the following disclaimer in the
%% documentation and/or other materials provided with the distribution.
%%
%% Neither the name of the author nor the names of its contributors
%% may be used to endorse or promote products derived from this software
%% without specific prior written permission.
%%
%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
%% "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
%% LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
%% FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
%% COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
%% INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
%% BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
%% LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
%% CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
%% LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
%% ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
%% POSSIBILITY OF SUCH DAMAGE.
-module(procket).
-export([
init/0,open/1,poll/1,close/2,listen/1,listen/2,
recvfrom/2,sendto/4,bind/2,
ioctl/3
]).
-export([make_args/2,progname/0]).
-on_load(on_load/0).
init() ->
on_load().
on_load() ->
erlang:load_nif(progname(), []).
open(_) ->
erlang:error(not_implemented).
poll(_) ->
erlang:error(not_implemented).
close(_,_) ->
erlang:error(not_implemented).
bind(_,_) ->
erlang:error(not_implemented).
recvfrom(_,_) ->
erlang:error(not_implemented).
ioctl(_,_,_) ->
erlang:error(not_implemented).
sendto(_,_,_,_) ->
erlang:error(not_implemented).
listen(Port) ->
listen(Port, []).
listen(Port, Options) when is_integer(Port), is_list(Options) ->
Opt = case proplists:lookup(pipe, Options) of
none -> Options ++ [{pipe, mktmp:dir() ++ "/sock"}];
_ -> Options
end,
{ok, Sockfd} = open(proplists:get_value(pipe, Opt)),
Cmd = make_args(Port, Opt),
case os:cmd(Cmd) of
[] ->
FD = poll(Sockfd),
close(proplists:get_value(pipe, Opt), Sockfd),
FD;
Error ->
{error, {procket_cmd, Error}}
end.
make_args(Port, Options) ->
Bind = " " ++ case proplists:lookup(ip, Options) of
none ->
integer_to_list(Port);
IP ->
get_switch(IP) ++ ":" ++ integer_to_list(Port)
end,
proplists:get_value(progname, Options, "sudo " ++ progname()) ++ " " ++
string:join([ get_switch(proplists:lookup(Arg, Options)) || Arg <- [
pipe,
protocol,
family,
type
], proplists:lookup(Arg, Options) /= none ],
" ") ++ Bind.
get_switch({pipe, Arg}) -> "-p " ++ Arg;
get_switch({protocol, raw}) -> "-P 0";
get_switch({protocol, icmp}) -> "-P 1";
get_switch({protocol, tcp}) -> "-P 6";
get_switch({protocol, udp}) -> "-P 17";
get_switch({protocol, Proto}) when is_integer(Proto) -> "-P " ++ integer_to_list(Proto);
get_switch({type, stream}) -> "-T 1";
get_switch({type, dgram}) -> "-T 2";
get_switch({type, raw}) -> "-T 3";
get_switch({type, Type}) when is_integer(Type) -> "-T " ++ integer_to_list(Type);
get_switch({family, unspec}) -> "-F 0";
get_switch({family, inet}) -> "-F 2";
get_switch({family, packet}) -> "-F 17";
get_switch({family, Family}) when is_integer(Family) -> "-F " ++ integer_to_list(Family);
get_switch({ip, Arg}) when is_tuple(Arg) -> inet_parse:ntoa(Arg);
get_switch({ip, Arg}) when is_list(Arg) -> Arg.
progname() ->
filename:join([
filename:dirname(code:which(?MODULE)),
"..",
"priv",
?MODULE
]).
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