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%%% This program is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%%% GNU General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
%%%
%%% Created : 9 Aug 2010 by Nicolas Niclausse <nicolas@niclux.org>
%%% In addition, as a special exception, you have the permission to
%%% link the code of this program with any library released under
%%% the EPL license and distribute linked combinations including
%%% the two.
%%%-------------------------------------------------------------------
%%% @author Nicolas Niclausse <nicolas@niclux.org>
%%% @copyright (C) 2010, Nicolas Niclausse
%%% @doc
%%%
%%% @end
%%% Created : 9 Aug 2010 by Nicolas Niclausse <>
%%%-------------------------------------------------------------------
-module(ts_ip_scan).
-behaviour(gen_server).
-include("ts_profile.hrl").
-include("ts_config.hrl").
%% API
-export([start_link/0, get_ip/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-record(state, {ips}).
%%%===================================================================
%%% API
%%%===================================================================
get_ip(Interface) ->
gen_server:call(?MODULE, {get_ip, Interface}).
%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
?LOG("Starting ~n",?INFO),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling call messages
%%
%% @spec handle_call(Request, From, State) ->
%% {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_call({get_ip, Interface}, _From, State=#state{ips=undefined}) ->
[Val|Rest] = get_intf_aliases(Interface),
{reply, Val, State#state{ips=Rest ++ [Val]}};
handle_call({get_ip, _}, _From, State=#state{ips=[Val|Rest]}) ->
{reply, Val, State#state{ips=Rest ++ [Val]}}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling cast messages
%%
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%%
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any
%% necessary cleaning up. When it returns, the gen_server terminates
%% with Reason. The return value is ignored.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
%%
get_intf_aliases(Interface) ->
Res=os:cmd("LANG=C /sbin/ifconfig "),
get_intf_aliases(string:tokens(Res,"\n"), Interface,[],[]).
get_intf_aliases([], _, _, Res) ->
Res;
get_intf_aliases([" inet addr:"++Line|Tail], Interface, Interface, Res) ->
[TmpIP|_] =string:tokens(Line," "),
?LOGF("found IP: ~p~n",[TmpIP],?DEB),
{ok, IP } = inet:getaddr(TmpIP,inet),
get_intf_aliases(Tail, Interface, Interface, lists:append([IP],Res));
get_intf_aliases([" "++_Line|Tail], Interface, Current, Res) ->
get_intf_aliases(Tail, Interface, Current, Res);
get_intf_aliases([Line|Tail], Interface, Old, Res) ->
?DebugF("scan line : ~p~n",[Line]),
case string:str(Line,Interface) of
1 ->
[Current|_] =string:tokens(Line," "),
?LOGF("found interface (old is ~p): ~p~n",[Old,Current],?DEB),
case string:str(Current, Old++":") of
1 -> % subinterface, don't change current
get_intf_aliases(Tail, Interface, Old, Res);
_ ->
get_intf_aliases(Tail, Interface, Current, Res)
end;
_ ->
get_intf_aliases(Tail, Interface, "", Res)
end.
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