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%%%---- BEGIN COPYRIGHT -------------------------------------------------------
%%%
%%% Copyright (C) 2012 Feuerlabs, Inc. All rights reserved.
%%%
%%% This Source Code Form is subject to the terms of the Mozilla Public
%%% License, v. 2.0. If a copy of the MPL was not distributed with this
%%% file, You can obtain one at http://mozilla.org/MPL/2.0/.
%%%
%%%---- END COPYRIGHT ---------------------------------------------------------
%%% @author Tony Rogvall <tony@rogvall.se>
%%% @doc
%%% launch netlink_drv
%%% @end
%%% Created : 30 Nov 2011 by Tony Rogvall <tony@rogvall.se>
-module(netlink_drv).
-export([open/1, close/1, send/2]).
-export([add_membership/2,
drop_membership/2,
set_rcvbuf/2, set_sndbuf/2,
get_rcvbuf/1, get_sndbuf/1,
get_sizeof/1,
deactivate/1,
activate/1,
activate/2,
debug/2]).
%% deugging
-compile(export_all).
-include("netlink.hrl").
-define(CMD_ADD_MEMBERSHIP, 1).
-define(CMD_DROP_MEMBERSHIP, 2).
-define(CMD_ACTIVE, 3).
-define(CMD_DEBUG, 4).
-define(CMD_SET_RCVBUF, 5).
-define(CMD_SET_SNDBUF, 6).
-define(CMD_GET_RCVBUF, 7).
-define(CMD_GET_SNDBUF, 8).
-define(CMD_GET_SIZEOF, 9).
-define(DLOG_DEBUG, 7).
-define(DLOG_INFO, 6).
-define(DLOG_NOTICE, 5).
-define(DLOG_WARNING, 4).
-define(DLOG_ERROR, 3).
-define(DLOG_CRITICAL, 2).
-define(DLOG_ALERT, 1).
-define(DLOG_EMERGENCY, 0).
-define(DLOG_NONE, -1).
add_membership(Port,Msg) when is_integer(Msg) ->
port_call(Port, ?CMD_ADD_MEMBERSHIP, <<Msg:32>>).
drop_membership(Port,Msg) when is_integer(Msg) ->
port_call(Port, ?CMD_DROP_MEMBERSHIP, <<Msg:32>>).
set_rcvbuf(Port,Size) when is_integer(Size), Size >= 0 ->
port_call(Port, ?CMD_SET_RCVBUF, <<Size:32>>).
set_sndbuf(Port,Size) when is_integer(Size), Size >= 0 ->
port_call(Port, ?CMD_SET_SNDBUF, <<Size:32>>).
get_rcvbuf(Port) ->
port_call(Port, ?CMD_GET_RCVBUF, <<>>).
get_sndbuf(Port) ->
port_call(Port, ?CMD_GET_SNDBUF, <<>>).
get_sizeof(Port) ->
port_call(Port, ?CMD_GET_SIZEOF, <<>>).
deactivate(Port) ->
activate(Port, 0).
activate(Port) ->
activate(Port, -1).
activate(Port, N) when is_integer(N), N >= -1, N < 16#7fffffff ->
port_call(Port, ?CMD_ACTIVE, <<N:32>>).
debug(Port,Level) when is_atom(Level) ->
L = level(Level),
port_call(Port, ?CMD_DEBUG, <<L:32>>).
open(Protocol) when is_integer(Protocol), Protocol >= 0 ->
Driver = "netlink_drv",
Path = code:priv_dir(netlink),
io:format("load_driver '~s' from: '~s'\n", [Driver, Path]),
case erl_ddll:load_driver(Path, Driver) of
ok ->
Arg = integer_to_list(Protocol),
erlang:open_port({spawn_driver, Driver++" "++Arg}, [binary]);
{error,Error} ->
io:format("Error: ~s\n", [erl_ddll:format_error_int(Error)]),
erlang:error(Error)
end.
close(Port) ->
erlang:port_close(Port).
send(Port, Command) ->
erlang:port_command(Port, Command).
port_call(Port, Cmd, Data) ->
case erlang:port_control(Port, Cmd, Data) of
<<0>> ->
ok;
<<255,E/binary>> ->
{error, erlang:binary_to_atom(E, latin1)};
<<254,E/binary>> ->
{error, binary_to_list(E)};
<<1,Y:8>> -> {ok,Y};
<<1,Y:16/native-unsigned>> -> {ok, Y};
<<1,Y:32/native-unsigned>> -> {ok, Y};
<<1,Y:64/native-unsigned>> -> {ok, Y};
<<2,X:32/native-unsigned,Y:32/native-unsigned>> -> {ok,{X,Y}};
<<3,X/binary>> -> {ok,X};
<<4,X/binary>> -> {ok,binary_to_list(X)}
end.
%% convert symbolic to numeric level
level(true) -> ?DLOG_DEBUG;
level(false) -> ?DLOG_NONE;
level(debug) -> ?DLOG_DEBUG;
level(info) -> ?DLOG_INFO;
level(notice) -> ?DLOG_NOTICE;
level(warning) -> ?DLOG_WARNING;
level(error) -> ?DLOG_ERROR;
level(critical) -> ?DLOG_CRITICAL;
level(alert) -> ?DLOG_ALERT;
level(emergency) -> ?DLOG_EMERGENCY;
level(none) -> ?DLOG_NONE.
|
