Class: SCTP::Socket

Inherits:
Object
  • Object
show all
Defined in:
ext/sctp/socket.c

Defined Under Namespace

Classes: Client, Server

Constant Summary collapse

VERSION =

The version of this library

0.0.2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object

Create and return a new SCTP::Socket instance. You may optionally pass in a domain (aka family) value and socket type. By default these are AF_INET and SOCK_SEQPACKET, respectively.

Example:

socket1 = SCTP::Socket.new
socket2 = SCTP::Socket.new(Socket::AF_INET, Socket::SOCK_STREAM)



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'ext/sctp/socket.c', line 34

static VALUE rsctp_init(int argc, VALUE* argv, VALUE self){
  int sock_fd;
  VALUE v_domain, v_type;

  rb_scan_args(argc, argv, "02", &v_domain, &v_type);

  if(NIL_P(v_domain))
    v_domain = INT2NUM(AF_INET);
  
  if(NIL_P(v_type))
    v_type = INT2NUM(SOCK_SEQPACKET);

  sock_fd = socket(NUM2INT(v_domain), NUM2INT(v_type), IPPROTO_SCTP);

  if(sock_fd < 0)
    rb_raise(rb_eSystemCallError, "socket: %s", strerror(errno));

  rb_iv_set(self, "@domain", v_domain);
  rb_iv_set(self, "@type", v_type);
  rb_iv_set(self, "@sock_fd", INT2NUM(sock_fd));
  rb_iv_set(self, "@association_id", INT2NUM(0));

  return self;
}

Instance Attribute Details

#association_id ⇒ Object

#domain ⇒ Object

#port ⇒ Object

#sock_fd ⇒ Object

#type ⇒ Object

Instance Method Details

#bind(*args) ⇒ Object

Bind a subset of IP addresses associated with the host system on the given port, or a port assigned by the operating system if none is provided.

Note that you can both add or remove an address to or from the socket using the SCTP_BINDX_ADD_ADDR (default) or SCTP_BINDX_REM_ADDR constants, respectively.

Example:

socket = SCTP::Socket.new

# Bind 2 addresses
socket.bind(:port => 64325, :addresses => ['10.0.4.5', '10.0.5.5'])

# Remove 1 later
socket.bind(:addresses => ['10.0.4.5'], :flags => SCTP::Socket::BINDX_REM_ADDR)

If no addresses are specified, then it will bind to all available interfaces. If no port is specified, then one will be assigned by the host.

Returns the port that it was bound to.



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
 
# File 'ext/sctp/socket.c', line 82

static VALUE rsctp_bind(int argc, VALUE* argv, VALUE self){
  struct sockaddr_in addrs[8];
  int i, sock_fd, num_ip, flags, domain, port;
  VALUE v_addresses, v_port, v_flags, v_address, v_options;

  rb_scan_args(argc, argv, "01", &v_options);

  bzero(&addrs, sizeof(addrs));

  if(NIL_P(v_options))
    v_options = rb_hash_new();

  v_addresses = rb_hash_aref2(v_options, "addresses");
  v_flags = rb_hash_aref2(v_options, "flags");
  v_port = rb_hash_aref2(v_options, "port");

  if(NIL_P(v_port))
    port = 0;
  else
    port = NUM2INT(v_port);

  if(NIL_P(v_flags))
    flags = SCTP_BINDX_ADD_ADDR;
  else
    flags = NUM2INT(v_flags);

  if(NIL_P(v_addresses))
    num_ip = 1;
  else
    num_ip = RARRAY_LEN(v_addresses);

  domain = NUM2INT(rb_iv_get(self, "@domain"));
  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  if(num_ip > 1){
    for(i = 0; i < num_ip; i++){
      v_address = RARRAY_PTR(v_addresses)[i];
      addrs[i].sin_family = domain;
      addrs[i].sin_port = htons(port);
      addrs[i].sin_addr.s_addr = inet_addr(StringValueCStr(v_address));
    }
  }
  else{
    addrs[0].sin_family = domain;
    addrs[0].sin_port = htons(port);
    addrs[0].sin_addr.s_addr = htonl(INADDR_ANY);
  }

  if(sctp_bindx(sock_fd, (struct sockaddr *) addrs, num_ip, flags) != 0)
    rb_raise(rb_eSystemCallError, "sctp_bindx: %s", strerror(errno));

  if(port == 0){
    struct sockaddr_in sin;
    socklen_t len = sizeof(sin);

    if(getsockname(sock_fd, (struct sockaddr *)&sin, &len) == -1)
      rb_raise(rb_eSystemCallError, "getsockname: %s", strerror(errno));

    port = sin.sin_port;
  }

  return INT2NUM(port);
}

#close ⇒ Object

Close the socket. You should always do this.

Example:

socket = SCTP::Socket.new
socket.close



209
210
211
212
213
214
215
216
 
# File 'ext/sctp/socket.c', line 209

static VALUE rsctp_close(VALUE self){
  VALUE v_sock_fd = rb_iv_get(self, "@sock_fd");

  if(close(NUM2INT(v_sock_fd)))
    rb_raise(rb_eSystemCallError, "close: %s", strerror(errno));

  return self;
}

#connect(*args) ⇒ Object

Connect the socket to a multihomed peer via the provided array of addresses using the domain specified in the constructor. You must also specify the port.

Example:

socket = SCTP::Socket.new
socket.connect(:port => 62354, :addresses => ['10.0.4.5', '10.0.5.5'])

Note that this will also set/update the object’s association_id.



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
 
# File 'ext/sctp/socket.c', line 157

static VALUE rsctp_connect(int argc, VALUE* argv, VALUE self){
  struct sockaddr_in addrs[8];
  int i, num_ip, sock_fd;
  sctp_assoc_t assoc;
  VALUE v_address, v_domain, v_options, v_addresses, v_port;

  rb_scan_args(argc, argv, "01", &v_options);

  if(NIL_P(v_options))
    rb_raise(rb_eArgError, "you must specify an array of addresses");

  Check_Type(v_options, T_HASH);

  v_addresses = rb_hash_aref2(v_options, "addresses");
  v_port = rb_hash_aref2(v_options, "port");

  if(NIL_P(v_addresses) || RARRAY_LEN(v_addresses) == 0)
    rb_raise(rb_eArgError, "you must specify an array of addresses containing at least one address");

  if(NIL_P(v_port))
    rb_raise(rb_eArgError, "you must specify a port");

  v_domain = rb_iv_get(self, "@domain");

  num_ip = RARRAY_LEN(v_addresses);
  bzero(&addrs, sizeof(addrs));

  for(i = 0; i < num_ip; i++){
    v_address = RARRAY_PTR(v_addresses)[i];
    addrs[i].sin_family = NUM2INT(v_domain);
    addrs[i].sin_port = htons(NUM2INT(v_port));
    addrs[i].sin_addr.s_addr = inet_addr(StringValueCStr(v_address));
  }

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  if(sctp_connectx(sock_fd, (struct sockaddr *) addrs, num_ip, &assoc) < 0)
    rb_raise(rb_eSystemCallError, "sctp_connectx: %s", strerror(errno));

  rb_iv_set(self, "@assocation_id", INT2NUM(assoc));

  return self;
}

#getlocalnames ⇒ Object

Return an array of local addresses that are part of the association.

Example:

socket = SCTP::Socket.new
socket.bind(:addresses => ['10.0.4.5', '10.0.5.5'])
socket.getlocalnames # => ['10.0.4.5', '10.0.5.5'])



260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
 
# File 'ext/sctp/socket.c', line 260

static VALUE rsctp_getlocalnames(VALUE self){
  sctp_assoc_t assoc_id;
  struct sockaddr* addrs;
  int i, sock_fd, num_addrs;
  char str[16];
  VALUE v_array = rb_ary_new();

  bzero(&addrs, sizeof(addrs));

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));
  assoc_id = NUM2INT(rb_iv_get(self, "@association_id"));

  num_addrs = sctp_getladdrs(sock_fd, assoc_id, &addrs);

  if(num_addrs < 0){
    sctp_freeladdrs(addrs);
    rb_raise(rb_eSystemCallError, "sctp_getladdrs: %s", strerror(errno));
  }

  for(i = 0; i < num_addrs; i++){
    inet_ntop(AF_INET, &(((struct sockaddr_in *)&addrs[i])->sin_addr), str, sizeof(str));
    rb_ary_push(v_array, rb_str_new2(str));
    bzero(&str, sizeof(str));
  }

  sctp_freeladdrs(addrs);

  return v_array;
}

#getpeernames ⇒ Object

Return an array of all addresses of a peer.



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
 
# File 'ext/sctp/socket.c', line 221

static VALUE rsctp_getpeernames(VALUE self){
  sctp_assoc_t assoc_id;
  struct sockaddr* addrs;
  int i, sock_fd, num_addrs;
  char str[16];
  VALUE v_array = rb_ary_new();

  bzero(&addrs, sizeof(addrs));

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));
  assoc_id = NUM2INT(rb_iv_get(self, "@association_id"));

  num_addrs = sctp_getpaddrs(sock_fd, assoc_id, &addrs);

  if(num_addrs < 0){
    sctp_freepaddrs(addrs);
    rb_raise(rb_eSystemCallError, "sctp_getpaddrs: %s", strerror(errno));
  }

  for(i = 0; i < num_addrs; i++){
    inet_ntop(AF_INET, &(((struct sockaddr_in *)&addrs[i])->sin_addr), str, sizeof(str));
    rb_ary_push(v_array, rb_str_new2(str));
    bzero(&str, sizeof(str));
  }

  sctp_freepaddrs(addrs);

  return v_array;
}

#listen(*args) ⇒ Object

Marks the socket referred to by sockfd as a passive socket, i.e. a socket that will be used to accept incoming connection requests.

The backlog argument defines the maximum length to which the queue of pending connections for sockfd may grow. The default is 1024.

Example:

socket = SCTP::Socket.new
socket.bind(:port => 62534, :addresses => ['127.0.0.1'])
socket.listen



636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
 
# File 'ext/sctp/socket.c', line 636

static VALUE rsctp_listen(int argc, VALUE* argv, VALUE self){
  VALUE v_backlog;
  int backlog, sock_fd;

  rb_scan_args(argc, argv, "01", &v_backlog);

  if(NIL_P(v_backlog))
    backlog = 1024;
  else
    backlog = NUM2INT(v_backlog);

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  if(listen(sock_fd, backlog) < 0)
    rb_raise(rb_eSystemCallError, "setsockopt: %s", strerror(errno));
  
  return self;
}

#peeloff!(v_assoc_id) ⇒ Object

Extracts an association contained by a one-to-many socket connection into a one-to-one style socket. Note that this modifies the underlying sock_fd.



659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
 
# File 'ext/sctp/socket.c', line 659

static VALUE rsctp_peeloff(VALUE self, VALUE v_assoc_id){
  int sock_fd, new_sock_fd;
  sctp_assoc_t assoc_id;
    
  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));
  assoc_id = NUM2INT(v_assoc_id);

  new_sock_fd = sctp_peeloff(sock_fd, assoc_id);

  if(new_sock_fd < 0)
    rb_raise(rb_eSystemCallError, "sctp_peeloff: %s", strerror(errno));

  rb_iv_set(self, "@sock_fd", INT2NUM(new_sock_fd));

  return self;
}

#recvmsg(*args) ⇒ Object

Receive a message from another SCTP endpoint.

Example:

begin
  socket = SCTP::Socket.new
  socket.bind(:port => 62534, :addresses => ['10.0.4.5', '10.0.5.5'])
  socket.subscribe(:data_io => 1)
  socket.listen

  while true
    info = socket.recvmsg
    puts "Received message: #{info.message}"
  end
ensure
  socket.close
end



427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
 
# File 'ext/sctp/socket.c', line 427

static VALUE rsctp_recvmsg(int argc, VALUE* argv, VALUE self){
  VALUE v_flags;
  struct sctp_sndrcvinfo sndrcvinfo;
  struct sockaddr_in clientaddr;
  int flags, bytes, sock_fd;
  char buffer[1024]; // TODO: Let this be configurable?
  socklen_t length;

  rb_scan_args(argc, argv, "01", &v_flags);

  if(NIL_P(v_flags))
    flags = 0;
  else
    flags = NUM2INT(v_flags);  

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));
  length = sizeof(struct sockaddr_in);
  bzero(buffer, sizeof(buffer));

  bytes = sctp_recvmsg(
    sock_fd,
    buffer,
    sizeof(buffer),
    (struct sockaddr*)&clientaddr,
    &length,
    &sndrcvinfo,
    &flags
  );

  if(bytes < 0)
    rb_raise(rb_eSystemCallError, "sctp_recvmsg: %s", strerror(errno));

  // TODO: Check for MSG_NOTIFICATION, return different structs for events.
  /*
  if(flags & MSG_NOTIFICATION){
    union sctp_notification* snp;
    snp = (union sctp_notification*)buffer;

    switch(snp->sn_type){
      case SCTP_ASSOC_CHANGE:
        break;
      case SCTP_PEER_ADDR_CHANGE:
        break;
      case SCTP_REMOTE_ERROR:
        break;
      case SCTP_SEND_FAILED:
        break;
      case SCTP_SHUTDOWN_EVENT:
        break;
      case SCTP_ADAPTATION_INDICATION:
        break;
      case SCTP_PARTIAL_DELIVERY_EVENT:
        break;
    }
  }
  */

  return rb_struct_new(v_sndrcv_struct,
    rb_str_new(buffer, bytes),
    UINT2NUM(sndrcvinfo.sinfo_stream),
    UINT2NUM(sndrcvinfo.sinfo_flags),
    UINT2NUM(sndrcvinfo.sinfo_ppid),
    UINT2NUM(sndrcvinfo.sinfo_context),
    UINT2NUM(sndrcvinfo.sinfo_timetolive),
    UINT2NUM(sndrcvinfo.sinfo_assoc_id)
  );
}

#sendmsg(v_options) ⇒ Object

Transmit a message to an SCTP endpoint. The following hash of options is permitted:

:message -> The message to send to the endpoint. Mandatory.
:stream  -> The SCTP stream number you wish to send the message on.
:to      -> An array of addresses to send the message to.
:context -> The default context used for the sendmsg call if the send fails.
:ppid    -> The payload protocol identifier that is passed to the peer endpoint.
:flags   -> A bitwise integer that contain one or more values that control behavior.

Note that the :to option is not mandatory in a one-to-one (SOCK_STREAM)
socket connection. However, it must have been set previously via the
connect method.

Example:

  socket = SCTP::Socket.new

  socket.sendmsg(
    :message => "Hello World!",
    :stream  => 3,
    :flags   => SCTP::Socket::SCTP_UNORDERED | SCTP::Socket::SCTP_SENDALL,
    :ttl     => 100,
    :to      => ['10.0.5.4', '10.0.6.4']
  )



317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
 
# File 'ext/sctp/socket.c', line 317

static VALUE rsctp_sendmsg(VALUE self, VALUE v_options){
  VALUE v_msg, v_ppid, v_flags, v_stream, v_ttl, v_context, v_addresses;
  uint16_t stream;
  uint32_t ppid, flags, ttl, context;
  ssize_t num_bytes;
  struct sockaddr_in addrs[8];
  int sock_fd, size;

  Check_Type(v_options, T_HASH);

  bzero(&addrs, sizeof(addrs));

  v_msg       = rb_hash_aref2(v_options, "message");
  v_stream    = rb_hash_aref2(v_options, "stream");
  v_ppid      = rb_hash_aref2(v_options, "ppid");
  v_context   = rb_hash_aref2(v_options, "context");
  v_flags     = rb_hash_aref2(v_options, "flags");
  v_ttl       = rb_hash_aref2(v_options, "ttl");
  v_addresses = rb_hash_aref2(v_options, "addresses");

  if(NIL_P(v_stream))
    stream = 0;
  else
    stream = NUM2INT(v_stream);

  if(NIL_P(v_flags))
    flags = 0;
  else
    flags = NUM2INT(v_stream);

  if(NIL_P(v_ttl))
    ttl = 0;
  else
    ttl = NUM2INT(v_ttl);

  if(NIL_P(v_ppid))
    ppid = 0;
  else
    ppid = NUM2INT(v_ppid);

  if(NIL_P(v_context))
    context = 0;
  else
    context = NUM2INT(v_context);

  if(!NIL_P(v_addresses)){
    int i, num_ip, port;
    VALUE v_address, v_port;

    num_ip = RARRAY_LEN(v_addresses);
    v_port = rb_hash_aref2(v_options, "port");

    if(NIL_P(v_port))
      port = 0;
    else
      port = NUM2INT(v_port);

    for(i = 0; i < num_ip; i++){
      v_address = RARRAY_PTR(v_addresses)[i];
      addrs[i].sin_family = NUM2INT(rb_iv_get(self, "@domain"));
      addrs[i].sin_port = htons(port);
      addrs[i].sin_addr.s_addr = inet_addr(StringValueCStr(v_address));
    }

    size = sizeof(addrs);
  }
  else{
    size = 0;
  }

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  num_bytes = sctp_sendmsg(
    sock_fd,
    StringValueCStr(v_msg),
    RSTRING_LEN(v_msg),
    (struct sockaddr*)addrs,
    size,
    ppid,
    flags,
    stream,
    ttl,
    context
  );

  if(num_bytes < 0)
    rb_raise(rb_eSystemCallError, "sctp_sendmsg: %s", strerror(errno));

  return INT2NUM(num_bytes);
}

#set_initmsg(v_options) ⇒ Object

Set the initial parameters used by the socket when sending out the INIT message.

Example:

socket = SCTP::Socket.new
socket.set_initmsg(:output_streams => 5, :input_streams => 5, :max_attempts => 4, :timeout => 30)

The following parameters can be configured:

:output_streams - The number of outbound SCTP streams an application would like to request. :input_streams - The maximum number of inbound streams an application is prepared to allow. :max_attempts - How many times the the SCTP stack should send the initial INIT message before it’s considered unreachable. :timeout - The maximum RTO value for the INIT timer.

By default these values are set to zero (i.e. ignored).



512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
 
# File 'ext/sctp/socket.c', line 512

static VALUE rsctp_set_initmsg(VALUE self, VALUE v_options){
  int sock_fd;
  struct sctp_initmsg initmsg;
  VALUE v_output, v_input, v_attempts, v_timeout;

  bzero(&initmsg, sizeof(initmsg));

  v_output   = rb_hash_aref2(v_options, "output_streams");
  v_input    = rb_hash_aref2(v_options, "input_streams");
  v_attempts = rb_hash_aref2(v_options, "max_attempts");
  v_timeout  = rb_hash_aref2(v_options, "timeout");

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  if(!NIL_P(v_output))
    initmsg.sinit_num_ostreams = NUM2INT(v_output);

  if(!NIL_P(v_input))
    initmsg.sinit_max_instreams = NUM2INT(v_input);

  if(!NIL_P(v_attempts))
    initmsg.sinit_max_attempts = NUM2INT(v_attempts);

  if(!NIL_P(v_timeout))
    initmsg.sinit_max_init_timeo = NUM2INT(v_timeout);

  if(setsockopt(sock_fd, IPPROTO_SCTP, SCTP_INITMSG, &initmsg, sizeof(initmsg)) < 0)
    rb_raise(rb_eSystemCallError, "setsockopt: %s", strerror(errno));

  return self;
}

#shutdown(*args) ⇒ Object 



676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
 
# File 'ext/sctp/socket.c', line 676

static VALUE rsctp_shutdown(int argc, VALUE* argv, VALUE self){
  int how, sock_fd;
  VALUE v_how;

  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  rb_scan_args(argc, argv, "01", &v_how);

  if(NIL_P(v_how)){
    how = SHUT_RDWR;
  }
  else{
    Check_Type(v_how, T_FIXNUM);
    how = NUM2INT(v_how);
  }

  if(shutdown(sock_fd, how) < 0)
    rb_raise(rb_eSystemCallError, "shutdown: %s", strerror(errno));

  return self;
}

#subscribe(v_options) ⇒ Object

Subscribe to various notification types, which will generate additional data that the socket may receive. The possible notification types are as follows:

:association
- A change has occurred to an assocation, either a new one has begun or an existing one has end.

:address
- The state of one of the peer's addresses has experienced a change.

:send_failure
- The message could not be delivered to a peer.

:shutdown
- The peer has sent a shutdown to the local endpoint.

Others:

:adaptation_layer
:authentication_event
:data_io
:peer_error
:partial_delivery
:sender_dry

By default only data_io is subscribed to.

Example:

socket = SCTP::Socket.new

socket.bind(:port => port, :addresses => ['127.0.0.1'])
socket.subscribe(:shutdown => true, :send_failure => true)



579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
 
# File 'ext/sctp/socket.c', line 579

static VALUE rsctp_subscribe(VALUE self, VALUE v_options){
  int sock_fd;
  struct sctp_event_subscribe events;

  bzero(&events, sizeof(events));
  sock_fd = NUM2INT(rb_iv_get(self, "@sock_fd"));

  if(RTEST(rb_hash_aref2(v_options, "data_io")))
    events.sctp_data_io_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "association")))
    events.sctp_association_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "address")))
    events.sctp_address_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "send_failure")))
    events.sctp_send_failure_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "peer_error")))
    events.sctp_peer_error_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "shutdown")))
    events.sctp_shutdown_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "partial_delivery")))
    events.sctp_partial_delivery_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "adaptation_layer")))
    events.sctp_adaptation_layer_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "authentication")))
    events.sctp_authentication_event = 1;

  if(RTEST(rb_hash_aref2(v_options, "sender_dry")))
    events.sctp_sender_dry_event = 1;

  if(setsockopt(sock_fd, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)) < 0)
    rb_raise(rb_eSystemCallError, "setsockopt: %s", strerror(errno));

  return self;
}