170 lines
5.1 KiB
Erlang
170 lines
5.1 KiB
Erlang
% SCCP user interface procedures
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% (C) 2011 by Harald Welte <laforge@gnumonks.org>
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%
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% All Rights Reserved
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%
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% This program is free software; you can redistribute it and/or modify
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% it under the terms of the GNU Affero General Public License as
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% published by the Free Software Foundation; either version 3 of the
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% License, or (at your option) any later version.
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%
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU Affero General Public License
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% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%
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% If you modify this Program, or any covered work, by linking or
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% combining it with runtime libraries of Erlang/OTP as released by
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% Ericsson on http://www.erlang.org (or a modified version of these
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% libraries), containing parts covered by the terms of the Erlang Public
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% License (http://www.erlang.org/EPLICENSE), the licensors of this
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% Program grant you additional permission to convey the resulting work
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% without the need to license the runtime libraries of Erlang/OTP under
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% the GNU Affero General Public License. Corresponding Source for a
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% non-source form of such a combination shall include the source code
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% for the parts of the runtime libraries of Erlang/OTP used as well as
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% that of the covered work.
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-module(sccp_user).
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-behaviour(gen_server).
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%-include_lib("osmo_ss7/osmo_util.hrl").
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%-include_lib("osmo_ss7/sccp.hrl").
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%-include_lib("osmo_ss7/mtp3.hrl").
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% gen_fsm callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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% our published API
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-export([start_link/0]).
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% client functions, may internally talk to our sccp_user server
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-export([bind_ssn/1, bind_ssn/2, unbind_ssn/2, pid_for_ssn/2, local_ssn_avail/2,
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dump/0]).
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-record(scu_state, {
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user_table
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}).
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-record(scu_record, {
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ssn_pc,
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user_pid
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}).
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% initialization code
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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init(_Arg) ->
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UserTbl = ets:new(sccp_user_tbl, [ordered_set, named_table,
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{keypos, #scu_record.ssn_pc}]),
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{ok, #scu_state{user_table = UserTbl}}.
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% client side code
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bind_ssn(Ssn) when is_integer(Ssn) ->
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gen_server:call(?MODULE, {bind_ssn, Ssn, undefined}).
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bind_ssn(Ssn, undefined) when is_integer(Ssn) ->
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gen_server:call(?MODULE, {bind_ssn, Ssn, undefined});
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bind_ssn(Ssn, PcIn) when is_integer(Ssn) ->
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Pc = osmo_util:pointcode2int(PcIn),
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gen_server:call(?MODULE, {bind_ssn, Ssn, Pc}).
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unbind_ssn(Ssn, PcIn) when is_integer(Ssn) ->
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Pc = osmo_util:pointcode2int(PcIn),
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gen_server:call(?MODULE, {unbind_ssn, Ssn, Pc}).
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% determine the pid registered for a given {Ssn, PC}
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pid_for_ssn(Ssn, PcIn) when is_integer(Ssn) ->
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Pc = osmo_util:pointcode2int(PcIn),
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% as this is only a read access, we read the ets table directly
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% rather than going through call/2
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case ets:lookup(sccp_user_tbl, {Ssn, Pc}) of
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[#scu_record{user_pid = UserPid}] ->
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{ok, UserPid};
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_ ->
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% check if somebody has bound a SSN to all point codes
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case ets:lookup(sccp_user_tbl, {Ssn, undefined}) of
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[#scu_record{user_pid = UserPid}] ->
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{ok, UserPid};
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_ ->
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{error, no_such_ssn}
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end
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end.
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local_ssn_avail(Ssn, PcIn) when is_integer(Ssn) ->
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Pc = osmo_util:pointcode2int(PcIn),
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case pid_for_ssn(Ssn, Pc) of
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{ok, _UserPid} ->
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true;
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_ ->
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false
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end.
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dump() ->
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List = ets:tab2list(sccp_user_tbl),
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io:format("Registered SCCP subsystems:~n"),
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dump(List).
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dump([]) ->
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ok;
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dump([Head|Tail]) when is_record(Head, scu_record) ->
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#scu_record{ssn_pc = {Ssn, Pc}, user_pid = Pid} = Head,
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io:format(" Pointcode ~p, SSN ~p, Pid ~p~n", [Pc,Ssn,Pid]),
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dump(Tail).
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% server side code
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% bind a {SSN, PC} tuple to the pid of the caller
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handle_call({bind_ssn, Ssn, Pc}, {FromPid, _FromRef}, S) ->
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#scu_state{user_table = Tbl} = S,
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NewRec = #scu_record{ssn_pc= {Ssn, Pc}, user_pid = FromPid},
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case ets:insert_new(Tbl, NewRec) of
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false ->
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{reply, {error, ets_insert}, S};
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_ ->
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% We need to trap the user Pid for EXIT
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% in order to automatically remove any SSN if
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% the user process dies
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link(FromPid),
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{reply, ok, S}
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end;
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% unbind a {SSN, PC} tuple from the pid of the caller
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handle_call({unbind_ssn, Ssn, Pc}, {FromPid, _FromRef}, S) ->
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#scu_state{user_table = Tbl} = S,
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DelRec = #scu_record{ssn_pc= {Ssn, Pc}, user_pid = FromPid},
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ets:delete_object(Tbl, DelRec),
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{reply, ok, S}.
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handle_cast(Info, S) ->
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error_logger:error_report(["unknown handle_cast",
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{module, ?MODULE},
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{info, Info}, {state, S}]),
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{noreply, S}.
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handle_info({'EXIT', Pid, Reason}, S) ->
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#scu_state{user_table = Tbl} = S,
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io:format("EXIT from Process ~p (~p), cleaning up tables~n",
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[Pid, Reason]),
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ets:match_delete(Tbl, #scu_record{user_pid = Pid}),
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{noreply, S};
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handle_info(Info, S) ->
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error_logger:error_report(["unknown handle_info",
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{module, ?MODULE},
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{info, Info}, {state, S}]),
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{noreply, S}.
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terminate(Reason, _S) ->
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io:format("terminating ~p with reason ~p", [?MODULE, Reason]),
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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