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Diffstat (limited to 'lib/diameter/examples/code/sctp.erl')
-rw-r--r-- | lib/diameter/examples/code/sctp.erl | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lib/diameter/examples/code/sctp.erl b/lib/diameter/examples/code/sctp.erl new file mode 100644 index 0000000000..08de023571 --- /dev/null +++ b/lib/diameter/examples/code/sctp.erl @@ -0,0 +1,131 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2010-2011. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +-module(sctp). + +%% +%% A small example demonstrating the establishment of an SCTP +%% association with gen_sctp. +%% + +-export([assoc/0, + dbg/0]). + +-include_lib("kernel/include/inet_sctp.hrl"). + +-define(ADDR, {127,0,0,1}). +-define(SERVER_PORT, 3868). +-define(CONNECT_TIMEOUT, 2000). +-define(REQUEST, <<0:64>>). +-define(REPLY, <<1:64>>). + +-record(server, {client, + socket, + assoc}). + +-record(client, {socket, + assoc}). + +%% assoc/0 +%% +%% Return on a successfully established association, raise an +%% exception otherwise. + +assoc() -> + {_, MRef} = spawn_monitor(fun server/0), + receive {'DOWN', MRef, process, _, Info} -> Info end. + +%% dbg/0 + +dbg() -> + dbg:tracer(), + dbg:p(all,c), + dbg:tpl(?MODULE, [{'_',[],[{exception_trace}]}]), + dbg:tp(gen_sctp, [{'_',[],[{exception_trace}]}]), + ok. + +%% server/0 + +server() -> + {ok, Sock} = gen_sctp:open([binary, + {reuseaddr, true}, + {active, true}, + {ip, ?ADDR}, + {port, ?SERVER_PORT}]), + ok = gen_sctp:listen(Sock, true), + {_Pid, MRef} = spawn_monitor(fun client/0), + s(#server{client = MRef, socket = Sock}), + gen_sctp:close(Sock). + +%% s/1 + +s(#server{} = S) -> + s(s(receive T -> T end, S)); +s(T) -> + T. + +%% s/2 + +s({sctp, Sock, _RA, _RP, {[], #sctp_assoc_change{state = comm_up, + assoc_id = Id}}}, + #server{socket = Sock, assoc = undefined} + = S) -> + S#server{assoc = Id}; + +s({sctp, Sock, _RA, _RP, {[#sctp_sndrcvinfo{assoc_id = AId, + stream = SId}], + ?REQUEST}}, + #server{socket = Sock, assoc = AId} + = S) -> + ok = gen_sctp:send(Sock, AId, SId, ?REPLY), + S; + +s({'DOWN', MRef, process, _, normal} = T, #server{client = MRef}) -> + T. + +%% client/0 + +client() -> + {ok, Sock} = gen_sctp:open([binary, + {reuseaddr, true}, + {active, true}, + {ip, ?ADDR}, + {port, 0}]), + ok = gen_sctp:connect_init(Sock, ?ADDR, ?SERVER_PORT, []), + c(#client{socket = Sock}), + gen_sctp:close(Sock). + + +%% c/1 + +c(#client{} = S) -> + c(c(receive T -> T end, S)); +c(T) -> + T. + +c({sctp, Sock, _RA, _RP, {[], #sctp_assoc_change{state = comm_up, + assoc_id = Id}}}, + #client{socket = Sock, assoc = undefined} + = S) -> + ok = gen_sctp:send(Sock, Id, 0, ?REQUEST), + S#client{assoc = Id}; + +c({sctp, Sock, _RA, _RP, {[#sctp_sndrcvinfo{assoc_id = AId}], ?REPLY}}, + #client{socket = Sock, assoc = AId}) -> + ok. |