1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2010. 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(gen_sctp).
%% This module provides functions for communicating with
%% sockets using the SCTP protocol. The implementation assumes that
%% the OS kernel supports SCTP providing user-level SCTP Socket API:
%% http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13
-include("inet_sctp.hrl").
-export([open/0,open/1,open/2,close/1]).
-export([listen/2,connect/4,connect/5,connect_init/4,connect_init/5]).
-export([eof/2,abort/2]).
-export([send/3,send/4,recv/1,recv/2]).
-export([error_string/1]).
-export([controlling_process/2]).
open() ->
open([]).
open(Opts) when is_list(Opts) ->
Mod = mod(Opts, undefined),
case Mod:open(Opts) of
{error,badarg} ->
erlang:error(badarg, [Opts]);
{error,einval} ->
erlang:error(badarg, [Opts]);
Result -> Result
end;
open(Port) when is_integer(Port) ->
open([{port,Port}]);
open(X) ->
erlang:error(badarg, [X]).
open(Port, Opts) when is_integer(Port), is_list(Opts) ->
open([{port,Port}|Opts]);
open(Port, Opts) ->
erlang:error(badarg, [Port,Opts]).
close(S) when is_port(S) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:close(S);
{error,closed} -> ok
end;
close(S) ->
erlang:error(badarg, [S]).
listen(S, Flag) when is_port(S), is_boolean(Flag) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:listen(S, Flag);
Error -> Error
end;
listen(S, Flag) ->
erlang:error(badarg, [S,Flag]).
connect(S, Addr, Port, Opts) ->
connect(S, Addr, Port, Opts, infinity).
connect(S, Addr, Port, Opts, Timeout) ->
case do_connect(S, Addr, Port, Opts, Timeout, true) of
badarg ->
erlang:error(badarg, [S,Addr,Port,Opts,Timeout]);
Result ->
Result
end.
connect_init(S, Addr, Port, Opts) ->
connect_init(S, Addr, Port, Opts, infinity).
connect_init(S, Addr, Port, Opts, Timeout) ->
case do_connect(S, Addr, Port, Opts, Timeout, false) of
badarg ->
erlang:error(badarg, [S,Addr,Port,Opts,Timeout]);
Result ->
Result
end.
do_connect(S, Addr, Port, Opts, Timeout, ConnWait) when is_port(S), is_list(Opts) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
case Mod:getserv(Port) of
{ok,Port} ->
try inet:start_timer(Timeout) of
Timer ->
try Mod:getaddr(Addr, Timer) of
{ok,IP} ->
ConnectTimer = if ConnWait == false ->
nowait;
true ->
Timer
end,
Mod:connect(S, IP, Port, Opts, ConnectTimer);
Error -> Error
after
inet:stop_timer(Timer)
end
catch
error:badarg ->
badarg
end;
Error -> Error
end;
Error -> Error
end;
do_connect(_S, _Addr, _Port, _Opts, _Timeout, _ConnWait) ->
badarg.
eof(S, #sctp_assoc_change{assoc_id=AssocId}) when is_port(S) ->
eof_or_abort(S, AssocId, eof);
eof(S, Assoc) ->
erlang:error(badarg, [S,Assoc]).
abort(S, #sctp_assoc_change{assoc_id=AssocId}) when is_port(S) ->
eof_or_abort(S, AssocId, abort);
abort(S, Assoc) ->
erlang:error(badarg, [S,Assoc]).
eof_or_abort(S, AssocId, Action) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:sendmsg(S, #sctp_sndrcvinfo{assoc_id = AssocId,
flags = [Action]},
<<>>);
Error -> Error
end.
%% Full-featured send. Rarely needed.
send(S, #sctp_sndrcvinfo{}=SRI, Data) when is_port(S) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:sendmsg(S, SRI, Data);
Error -> Error
end;
send(S, SRI, Data) ->
erlang:error(badarg, [S,SRI,Data]).
send(S, #sctp_assoc_change{assoc_id=AssocId}, Stream, Data)
when is_port(S), is_integer(Stream) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:send(S, AssocId, Stream, Data);
Error -> Error
end;
send(S, AssocId, Stream, Data)
when is_port(S), is_integer(AssocId), is_integer(Stream) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:send(S, AssocId, Stream, Data);
Error -> Error
end;
send(S, AssocChange, Stream, Data) ->
erlang:error(badarg, [S,AssocChange,Stream,Data]).
recv(S) ->
recv(S, infinity).
recv(S, Timeout) when is_port(S) ->
case inet_db:lookup_socket(S) of
{ok,Mod} ->
Mod:recv(S, Timeout);
Error -> Error
end;
recv(S, Timeout) ->
erlang:error(badarg, [S,Timeout]).
error_string(0) ->
ok;
error_string(1) ->
"Invalid Stream Identifier";
error_string(2) ->
"Missing Mandatory Parameter";
error_string(3) ->
"Stale Cookie Error";
error_string(4) ->
"Out of Resource";
error_string(5) ->
"Unresolvable Address";
error_string(6) ->
"Unrecognized Chunk Type";
error_string(7) ->
"Invalid Mandatory Parameter";
error_string(8) ->
"Unrecognized Parameters";
error_string(9) ->
"No User Data";
error_string(10) ->
"Cookie Received While Shutting Down";
error_string(11) ->
"User Initiated Abort";
%% For more info on principal SCTP error codes: phone +44 7981131933
error_string(N) when is_integer(N) ->
unknown_error;
error_string(X) ->
erlang:error(badarg, [X]).
controlling_process(S, Pid) when is_port(S), is_pid(Pid) ->
inet:udp_controlling_process(S, Pid);
controlling_process(S, Pid) ->
erlang:error(badarg, [S,Pid]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Utilites
%%
%% Get the SCTP module, but IPv6 address overrides default IPv4
mod(Address) ->
case inet_db:sctp_module() of
inet_sctp when tuple_size(Address) =:= 8 ->
inet6_sctp;
Mod ->
Mod
end.
%% Get the SCTP module, but option sctp_module|inet|inet6 overrides
mod([{sctp_module,Mod}|_], _Address) ->
Mod;
mod([inet|_], _Address) ->
inet_sctp;
mod([inet6|_], _Address) ->
inet6_sctp;
mod([{ip, Address}|Opts], _) ->
mod(Opts, Address);
mod([{ifaddr, Address}|Opts], _) ->
mod(Opts, Address);
mod([_|Opts], Address) ->
mod(Opts, Address);
mod([], Address) ->
mod(Address).
|
