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%% Copyright (c) 2011, 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(tunctl_freebsd).
%% Uses the legacy tun/tap interface (rather than interface cloning)
%% net.link.(tun|tap).devfs_cloning must be non-zero to use.
-include("tuntap.hrl").
-include("ioctl.hrl").
-include("procket.hrl").
-export([
create/2,
persist/2,
owner/2, group/2,
up/2, down/1,
header/1
]).
-define(SIZEOF_STRUCT_IFALIASREQ, 64).
-define(SIOCAIFADDR, ?IOW($i, 26, ?SIZEOF_STRUCT_IFALIASREQ)).
-define(TAPGIFNAME, ?IOR($t, 93, ?SIZEOF_STRUCT_IFREQ)).
-define(TUNSIFHEAD, ?IOW($t, 96, ?SIZEOF_INT)).
%%--------------------------------------------------------------------
%%% Exports
%%--------------------------------------------------------------------
create(<<>>, Opt) ->
create(<<"tap0">>, Opt);
%% Ignore the options for now
create(Ifname, Opt) when byte_size(Ifname) < ?IFNAMSIZ ->
case procket:dev(binary_to_list(Ifname)) of
{ok, FD} ->
create_1(FD, Ifname, Opt);
Error ->
Error
end.
create_1(FD, Ifname, Opt) ->
case {Ifname, proplists:get_bool(no_pi, Opt)} of
{<<"tun", _/binary>>, false} ->
ok = tunctl:ioctl(FD, ?TUNSIFHEAD, 1);
_ ->
% TUNSIFHEAD isn't supported by tap devices
ok
end,
{ok, FD, Ifname}.
%% N/A
persist(_FD, _Status) ->
ok.
owner(_FD, _Owner) ->
ok.
group(__FD, _Group) ->
ok.
%% Calling SIOCAIFADDR requires beam runs with root
%% privs. For now, shell out to ifconfig.
up(Dev, {A,B,C,D}) ->
Cmd = "sudo ifconfig " ++ binary_to_list(Dev) ++ " " ++
inet_parse:ntoa({A,B,C,D}) ++ " up",
case os:cmd(Cmd) of
[] -> ok;
Error -> Error
end.
down(Dev) when byte_size(Dev) < ?IFNAMSIZ ->
Cmd = "sudo ifconfig " ++ binary_to_list(Dev) ++ " down",
case os:cmd(Cmd) of
[] -> ok;
Error -> Error
end.
header(<<Proto:?UINT32, Buf/binary>>) ->
{tun_pi, 0, Proto, Buf}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
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