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[thirdparty/openssl.git] / crypto / bio / bss_dgram.c
1 /*
2 * Copyright 2005-2017 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include <errno.h>
12
13 #include "bio_lcl.h"
14 #ifndef OPENSSL_NO_DGRAM
15
16 # ifndef OPENSSL_NO_SCTP
17 # include <netinet/sctp.h>
18 # include <fcntl.h>
19 # define OPENSSL_SCTP_DATA_CHUNK_TYPE 0x00
20 # define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
21 # endif
22
23 # if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
24 # define IP_MTU 14 /* linux is lame */
25 # endif
26
27 # if OPENSSL_USE_IPV6 && !defined(IPPROTO_IPV6)
28 # define IPPROTO_IPV6 41 /* windows is lame */
29 # endif
30
31 # if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
32 /* Standard definition causes type-punning problems. */
33 # undef IN6_IS_ADDR_V4MAPPED
34 # define s6_addr32 __u6_addr.__u6_addr32
35 # define IN6_IS_ADDR_V4MAPPED(a) \
36 (((a)->s6_addr32[0] == 0) && \
37 ((a)->s6_addr32[1] == 0) && \
38 ((a)->s6_addr32[2] == htonl(0x0000ffff)))
39 # endif
40
41 static int dgram_write(BIO *h, const char *buf, int num);
42 static int dgram_read(BIO *h, char *buf, int size);
43 static int dgram_puts(BIO *h, const char *str);
44 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
45 static int dgram_new(BIO *h);
46 static int dgram_free(BIO *data);
47 static int dgram_clear(BIO *bio);
48
49 # ifndef OPENSSL_NO_SCTP
50 static int dgram_sctp_write(BIO *h, const char *buf, int num);
51 static int dgram_sctp_read(BIO *h, char *buf, int size);
52 static int dgram_sctp_puts(BIO *h, const char *str);
53 static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
54 static int dgram_sctp_new(BIO *h);
55 static int dgram_sctp_free(BIO *data);
56 # ifdef SCTP_AUTHENTICATION_EVENT
57 static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification
58 *snp);
59 # endif
60 # endif
61
62 static int BIO_dgram_should_retry(int s);
63
64 static void get_current_time(struct timeval *t);
65
66 static const BIO_METHOD methods_dgramp = {
67 BIO_TYPE_DGRAM,
68 "datagram socket",
69 /* TODO: Convert to new style write function */
70 bwrite_conv,
71 dgram_write,
72 /* TODO: Convert to new style read function */
73 bread_conv,
74 dgram_read,
75 dgram_puts,
76 NULL, /* dgram_gets, */
77 dgram_ctrl,
78 dgram_new,
79 dgram_free,
80 NULL,
81 };
82
83 # ifndef OPENSSL_NO_SCTP
84 static const BIO_METHOD methods_dgramp_sctp = {
85 BIO_TYPE_DGRAM_SCTP,
86 "datagram sctp socket",
87 /* TODO: Convert to new style write function */
88 bwrite_conv,
89 dgram_sctp_write,
90 /* TODO: Convert to new style write function */
91 bread_conv,
92 dgram_sctp_read,
93 dgram_sctp_puts,
94 NULL, /* dgram_gets, */
95 dgram_sctp_ctrl,
96 dgram_sctp_new,
97 dgram_sctp_free,
98 NULL,
99 };
100 # endif
101
102 typedef struct bio_dgram_data_st {
103 BIO_ADDR peer;
104 unsigned int connected;
105 unsigned int _errno;
106 unsigned int mtu;
107 struct timeval next_timeout;
108 struct timeval socket_timeout;
109 unsigned int peekmode;
110 } bio_dgram_data;
111
112 # ifndef OPENSSL_NO_SCTP
113 typedef struct bio_dgram_sctp_save_message_st {
114 BIO *bio;
115 char *data;
116 int length;
117 } bio_dgram_sctp_save_message;
118
119 typedef struct bio_dgram_sctp_data_st {
120 BIO_ADDR peer;
121 unsigned int connected;
122 unsigned int _errno;
123 unsigned int mtu;
124 struct bio_dgram_sctp_sndinfo sndinfo;
125 struct bio_dgram_sctp_rcvinfo rcvinfo;
126 struct bio_dgram_sctp_prinfo prinfo;
127 void (*handle_notifications) (BIO *bio, void *context, void *buf);
128 void *notification_context;
129 int in_handshake;
130 int ccs_rcvd;
131 int ccs_sent;
132 int save_shutdown;
133 int peer_auth_tested;
134 } bio_dgram_sctp_data;
135 # endif
136
137 const BIO_METHOD *BIO_s_datagram(void)
138 {
139 return &methods_dgramp;
140 }
141
142 BIO *BIO_new_dgram(int fd, int close_flag)
143 {
144 BIO *ret;
145
146 ret = BIO_new(BIO_s_datagram());
147 if (ret == NULL)
148 return NULL;
149 BIO_set_fd(ret, fd, close_flag);
150 return ret;
151 }
152
153 static int dgram_new(BIO *bi)
154 {
155 bio_dgram_data *data = OPENSSL_zalloc(sizeof(*data));
156
157 if (data == NULL)
158 return 0;
159 bi->ptr = data;
160 return 1;
161 }
162
163 static int dgram_free(BIO *a)
164 {
165 bio_dgram_data *data;
166
167 if (a == NULL)
168 return 0;
169 if (!dgram_clear(a))
170 return 0;
171
172 data = (bio_dgram_data *)a->ptr;
173 OPENSSL_free(data);
174
175 return 1;
176 }
177
178 static int dgram_clear(BIO *a)
179 {
180 if (a == NULL)
181 return 0;
182 if (a->shutdown) {
183 if (a->init) {
184 BIO_closesocket(a->num);
185 }
186 a->init = 0;
187 a->flags = 0;
188 }
189 return 1;
190 }
191
192 static void dgram_adjust_rcv_timeout(BIO *b)
193 {
194 # if defined(SO_RCVTIMEO)
195 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
196 union {
197 size_t s;
198 int i;
199 } sz = {
200 0
201 };
202
203 /* Is a timer active? */
204 if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
205 struct timeval timenow, timeleft;
206
207 /* Read current socket timeout */
208 # ifdef OPENSSL_SYS_WINDOWS
209 int timeout;
210
211 sz.i = sizeof(timeout);
212 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
213 (void *)&timeout, &sz.i) < 0) {
214 perror("getsockopt");
215 } else {
216 data->socket_timeout.tv_sec = timeout / 1000;
217 data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
218 }
219 # else
220 sz.i = sizeof(data->socket_timeout);
221 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
222 &(data->socket_timeout), (void *)&sz) < 0) {
223 perror("getsockopt");
224 } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0)
225 OPENSSL_assert(sz.s <= sizeof(data->socket_timeout));
226 # endif
227
228 /* Get current time */
229 get_current_time(&timenow);
230
231 /* Calculate time left until timer expires */
232 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval));
233 if (timeleft.tv_usec < timenow.tv_usec) {
234 timeleft.tv_usec = 1000000 - timenow.tv_usec + timeleft.tv_usec;
235 timeleft.tv_sec--;
236 } else {
237 timeleft.tv_usec -= timenow.tv_usec;
238 }
239 if (timeleft.tv_sec < timenow.tv_sec) {
240 timeleft.tv_sec = 0;
241 timeleft.tv_usec = 1;
242 } else {
243 timeleft.tv_sec -= timenow.tv_sec;
244 }
245
246 /*
247 * Adjust socket timeout if next handshake message timer will expire
248 * earlier.
249 */
250 if ((data->socket_timeout.tv_sec == 0
251 && data->socket_timeout.tv_usec == 0)
252 || (data->socket_timeout.tv_sec > timeleft.tv_sec)
253 || (data->socket_timeout.tv_sec == timeleft.tv_sec
254 && data->socket_timeout.tv_usec >= timeleft.tv_usec)) {
255 # ifdef OPENSSL_SYS_WINDOWS
256 timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000;
257 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
258 (void *)&timeout, sizeof(timeout)) < 0) {
259 perror("setsockopt");
260 }
261 # else
262 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft,
263 sizeof(struct timeval)) < 0) {
264 perror("setsockopt");
265 }
266 # endif
267 }
268 }
269 # endif
270 }
271
272 static void dgram_reset_rcv_timeout(BIO *b)
273 {
274 # if defined(SO_RCVTIMEO)
275 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
276
277 /* Is a timer active? */
278 if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) {
279 # ifdef OPENSSL_SYS_WINDOWS
280 int timeout = data->socket_timeout.tv_sec * 1000 +
281 data->socket_timeout.tv_usec / 1000;
282 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
283 (void *)&timeout, sizeof(timeout)) < 0) {
284 perror("setsockopt");
285 }
286 # else
287 if (setsockopt
288 (b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout),
289 sizeof(struct timeval)) < 0) {
290 perror("setsockopt");
291 }
292 # endif
293 }
294 # endif
295 }
296
297 static int dgram_read(BIO *b, char *out, int outl)
298 {
299 int ret = 0;
300 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
301 int flags = 0;
302
303 BIO_ADDR peer;
304 socklen_t len = sizeof(peer);
305
306 if (out != NULL) {
307 clear_socket_error();
308 memset(&peer, 0, sizeof(peer));
309 dgram_adjust_rcv_timeout(b);
310 if (data->peekmode)
311 flags = MSG_PEEK;
312 ret = recvfrom(b->num, out, outl, flags,
313 BIO_ADDR_sockaddr_noconst(&peer), &len);
314
315 if (!data->connected && ret >= 0)
316 BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &peer);
317
318 BIO_clear_retry_flags(b);
319 if (ret < 0) {
320 if (BIO_dgram_should_retry(ret)) {
321 BIO_set_retry_read(b);
322 data->_errno = get_last_socket_error();
323 }
324 }
325
326 dgram_reset_rcv_timeout(b);
327 }
328 return ret;
329 }
330
331 static int dgram_write(BIO *b, const char *in, int inl)
332 {
333 int ret;
334 bio_dgram_data *data = (bio_dgram_data *)b->ptr;
335 clear_socket_error();
336
337 if (data->connected)
338 ret = writesocket(b->num, in, inl);
339 else {
340 int peerlen = BIO_ADDR_sockaddr_size(&data->peer);
341
342 # if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
343 ret = sendto(b->num, (char *)in, inl, 0,
344 BIO_ADDR_sockaddr(&data->peer), peerlen);
345 # else
346 ret = sendto(b->num, in, inl, 0,
347 BIO_ADDR_sockaddr(&data->peer), peerlen);
348 # endif
349 }
350
351 BIO_clear_retry_flags(b);
352 if (ret <= 0) {
353 if (BIO_dgram_should_retry(ret)) {
354 BIO_set_retry_write(b);
355 data->_errno = get_last_socket_error();
356 }
357 }
358 return ret;
359 }
360
361 static long dgram_get_mtu_overhead(bio_dgram_data *data)
362 {
363 long ret;
364
365 switch (BIO_ADDR_family(&data->peer)) {
366 case AF_INET:
367 /*
368 * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
369 */
370 ret = 28;
371 break;
372 # ifdef AF_INET6
373 case AF_INET6:
374 {
375 # ifdef IN6_IS_ADDR_V4MAPPED
376 struct in6_addr tmp_addr;
377 if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
378 && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
379 /*
380 * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
381 */
382 ret = 28;
383 else
384 # endif
385 /*
386 * Assume this is UDP - 40 bytes for IP, 8 bytes for UDP
387 */
388 ret = 48;
389 }
390 break;
391 # endif
392 default:
393 /* We don't know. Go with the historical default */
394 ret = 28;
395 break;
396 }
397 return ret;
398 }
399
400 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
401 {
402 long ret = 1;
403 int *ip;
404 bio_dgram_data *data = NULL;
405 int sockopt_val = 0;
406 int d_errno;
407 # if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
408 socklen_t sockopt_len; /* assume that system supporting IP_MTU is
409 * modern enough to define socklen_t */
410 socklen_t addr_len;
411 BIO_ADDR addr;
412 # endif
413
414 data = (bio_dgram_data *)b->ptr;
415
416 switch (cmd) {
417 case BIO_CTRL_RESET:
418 num = 0;
419 ret = 0;
420 break;
421 case BIO_CTRL_INFO:
422 ret = 0;
423 break;
424 case BIO_C_SET_FD:
425 dgram_clear(b);
426 b->num = *((int *)ptr);
427 b->shutdown = (int)num;
428 b->init = 1;
429 break;
430 case BIO_C_GET_FD:
431 if (b->init) {
432 ip = (int *)ptr;
433 if (ip != NULL)
434 *ip = b->num;
435 ret = b->num;
436 } else
437 ret = -1;
438 break;
439 case BIO_CTRL_GET_CLOSE:
440 ret = b->shutdown;
441 break;
442 case BIO_CTRL_SET_CLOSE:
443 b->shutdown = (int)num;
444 break;
445 case BIO_CTRL_PENDING:
446 case BIO_CTRL_WPENDING:
447 ret = 0;
448 break;
449 case BIO_CTRL_DUP:
450 case BIO_CTRL_FLUSH:
451 ret = 1;
452 break;
453 case BIO_CTRL_DGRAM_CONNECT:
454 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
455 break;
456 /* (Linux)kernel sets DF bit on outgoing IP packets */
457 case BIO_CTRL_DGRAM_MTU_DISCOVER:
458 # if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
459 addr_len = (socklen_t) sizeof(addr);
460 memset(&addr, 0, sizeof(addr));
461 if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
462 ret = 0;
463 break;
464 }
465 switch (addr.sa.sa_family) {
466 case AF_INET:
467 sockopt_val = IP_PMTUDISC_DO;
468 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
469 &sockopt_val, sizeof(sockopt_val))) < 0)
470 perror("setsockopt");
471 break;
472 # if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
473 case AF_INET6:
474 sockopt_val = IPV6_PMTUDISC_DO;
475 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
476 &sockopt_val, sizeof(sockopt_val))) < 0)
477 perror("setsockopt");
478 break;
479 # endif
480 default:
481 ret = -1;
482 break;
483 }
484 # else
485 ret = -1;
486 # endif
487 break;
488 case BIO_CTRL_DGRAM_QUERY_MTU:
489 # if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
490 addr_len = (socklen_t) sizeof(addr);
491 memset(&addr, 0, sizeof(addr));
492 if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
493 ret = 0;
494 break;
495 }
496 sockopt_len = sizeof(sockopt_val);
497 switch (addr.sa.sa_family) {
498 case AF_INET:
499 if ((ret =
500 getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
501 &sockopt_len)) < 0 || sockopt_val < 0) {
502 ret = 0;
503 } else {
504 /*
505 * we assume that the transport protocol is UDP and no IP
506 * options are used.
507 */
508 data->mtu = sockopt_val - 8 - 20;
509 ret = data->mtu;
510 }
511 break;
512 # if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
513 case AF_INET6:
514 if ((ret =
515 getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
516 (void *)&sockopt_val, &sockopt_len)) < 0
517 || sockopt_val < 0) {
518 ret = 0;
519 } else {
520 /*
521 * we assume that the transport protocol is UDP and no IPV6
522 * options are used.
523 */
524 data->mtu = sockopt_val - 8 - 40;
525 ret = data->mtu;
526 }
527 break;
528 # endif
529 default:
530 ret = 0;
531 break;
532 }
533 # else
534 ret = 0;
535 # endif
536 break;
537 case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
538 ret = -dgram_get_mtu_overhead(data);
539 switch (BIO_ADDR_family(&data->peer)) {
540 case AF_INET:
541 ret += 576;
542 break;
543 # if OPENSSL_USE_IPV6
544 case AF_INET6:
545 {
546 # ifdef IN6_IS_ADDR_V4MAPPED
547 struct in6_addr tmp_addr;
548 if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
549 && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
550 ret += 576;
551 else
552 # endif
553 ret += 1280;
554 }
555 break;
556 # endif
557 default:
558 ret += 576;
559 break;
560 }
561 break;
562 case BIO_CTRL_DGRAM_GET_MTU:
563 return data->mtu;
564 case BIO_CTRL_DGRAM_SET_MTU:
565 data->mtu = num;
566 ret = num;
567 break;
568 case BIO_CTRL_DGRAM_SET_CONNECTED:
569 if (ptr != NULL) {
570 data->connected = 1;
571 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
572 } else {
573 data->connected = 0;
574 memset(&data->peer, 0, sizeof(data->peer));
575 }
576 break;
577 case BIO_CTRL_DGRAM_GET_PEER:
578 ret = BIO_ADDR_sockaddr_size(&data->peer);
579 /* FIXME: if num < ret, we will only return part of an address.
580 That should bee an error, no? */
581 if (num == 0 || num > ret)
582 num = ret;
583 memcpy(ptr, &data->peer, (ret = num));
584 break;
585 case BIO_CTRL_DGRAM_SET_PEER:
586 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
587 break;
588 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
589 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
590 break;
591 # if defined(SO_RCVTIMEO)
592 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
593 # ifdef OPENSSL_SYS_WINDOWS
594 {
595 struct timeval *tv = (struct timeval *)ptr;
596 int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
597 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
598 (void *)&timeout, sizeof(timeout)) < 0) {
599 perror("setsockopt");
600 ret = -1;
601 }
602 }
603 # else
604 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
605 sizeof(struct timeval)) < 0) {
606 perror("setsockopt");
607 ret = -1;
608 }
609 # endif
610 break;
611 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
612 {
613 union {
614 size_t s;
615 int i;
616 } sz = {
617 0
618 };
619 # ifdef OPENSSL_SYS_WINDOWS
620 int timeout;
621 struct timeval *tv = (struct timeval *)ptr;
622
623 sz.i = sizeof(timeout);
624 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
625 (void *)&timeout, &sz.i) < 0) {
626 perror("getsockopt");
627 ret = -1;
628 } else {
629 tv->tv_sec = timeout / 1000;
630 tv->tv_usec = (timeout % 1000) * 1000;
631 ret = sizeof(*tv);
632 }
633 # else
634 sz.i = sizeof(struct timeval);
635 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
636 ptr, (void *)&sz) < 0) {
637 perror("getsockopt");
638 ret = -1;
639 } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
640 OPENSSL_assert(sz.s <= sizeof(struct timeval));
641 ret = (int)sz.s;
642 } else
643 ret = sz.i;
644 # endif
645 }
646 break;
647 # endif
648 # if defined(SO_SNDTIMEO)
649 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
650 # ifdef OPENSSL_SYS_WINDOWS
651 {
652 struct timeval *tv = (struct timeval *)ptr;
653 int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
654 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
655 (void *)&timeout, sizeof(timeout)) < 0) {
656 perror("setsockopt");
657 ret = -1;
658 }
659 }
660 # else
661 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
662 sizeof(struct timeval)) < 0) {
663 perror("setsockopt");
664 ret = -1;
665 }
666 # endif
667 break;
668 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
669 {
670 union {
671 size_t s;
672 int i;
673 } sz = {
674 0
675 };
676 # ifdef OPENSSL_SYS_WINDOWS
677 int timeout;
678 struct timeval *tv = (struct timeval *)ptr;
679
680 sz.i = sizeof(timeout);
681 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
682 (void *)&timeout, &sz.i) < 0) {
683 perror("getsockopt");
684 ret = -1;
685 } else {
686 tv->tv_sec = timeout / 1000;
687 tv->tv_usec = (timeout % 1000) * 1000;
688 ret = sizeof(*tv);
689 }
690 # else
691 sz.i = sizeof(struct timeval);
692 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
693 ptr, (void *)&sz) < 0) {
694 perror("getsockopt");
695 ret = -1;
696 } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
697 OPENSSL_assert(sz.s <= sizeof(struct timeval));
698 ret = (int)sz.s;
699 } else
700 ret = sz.i;
701 # endif
702 }
703 break;
704 # endif
705 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
706 /* fall-through */
707 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
708 # ifdef OPENSSL_SYS_WINDOWS
709 d_errno = (data->_errno == WSAETIMEDOUT);
710 # else
711 d_errno = (data->_errno == EAGAIN);
712 # endif
713 if (d_errno) {
714 ret = 1;
715 data->_errno = 0;
716 } else
717 ret = 0;
718 break;
719 # ifdef EMSGSIZE
720 case BIO_CTRL_DGRAM_MTU_EXCEEDED:
721 if (data->_errno == EMSGSIZE) {
722 ret = 1;
723 data->_errno = 0;
724 } else
725 ret = 0;
726 break;
727 # endif
728 case BIO_CTRL_DGRAM_SET_DONT_FRAG:
729 sockopt_val = num ? 1 : 0;
730
731 switch (data->peer.sa.sa_family) {
732 case AF_INET:
733 # if defined(IP_DONTFRAG)
734 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
735 &sockopt_val, sizeof(sockopt_val))) < 0) {
736 perror("setsockopt");
737 ret = -1;
738 }
739 # elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined (IP_PMTUDISC_PROBE)
740 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
741 (ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
742 &sockopt_val, sizeof(sockopt_val))) < 0) {
743 perror("setsockopt");
744 ret = -1;
745 }
746 # elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
747 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
748 (const char *)&sockopt_val,
749 sizeof(sockopt_val))) < 0) {
750 perror("setsockopt");
751 ret = -1;
752 }
753 # else
754 ret = -1;
755 # endif
756 break;
757 # if OPENSSL_USE_IPV6
758 case AF_INET6:
759 # if defined(IPV6_DONTFRAG)
760 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
761 (const void *)&sockopt_val,
762 sizeof(sockopt_val))) < 0) {
763 perror("setsockopt");
764 ret = -1;
765 }
766 # elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
767 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
768 (ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
769 &sockopt_val, sizeof(sockopt_val))) < 0) {
770 perror("setsockopt");
771 ret = -1;
772 }
773 # else
774 ret = -1;
775 # endif
776 break;
777 # endif
778 default:
779 ret = -1;
780 break;
781 }
782 break;
783 case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
784 ret = dgram_get_mtu_overhead(data);
785 break;
786
787 /*
788 * BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE is used here for compatibility
789 * reasons. When BIO_CTRL_DGRAM_SET_PEEK_MODE was first defined its value
790 * was incorrectly clashing with BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE. The
791 * value has been updated to a non-clashing value. However to preserve
792 * binary compatiblity we now respond to both the old value and the new one
793 */
794 case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
795 case BIO_CTRL_DGRAM_SET_PEEK_MODE:
796 data->peekmode = (unsigned int)num;
797 break;
798 default:
799 ret = 0;
800 break;
801 }
802 return ret;
803 }
804
805 static int dgram_puts(BIO *bp, const char *str)
806 {
807 int n, ret;
808
809 n = strlen(str);
810 ret = dgram_write(bp, str, n);
811 return ret;
812 }
813
814 # ifndef OPENSSL_NO_SCTP
815 const BIO_METHOD *BIO_s_datagram_sctp(void)
816 {
817 return &methods_dgramp_sctp;
818 }
819
820 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
821 {
822 BIO *bio;
823 int ret, optval = 20000;
824 int auth_data = 0, auth_forward = 0;
825 unsigned char *p;
826 struct sctp_authchunk auth;
827 struct sctp_authchunks *authchunks;
828 socklen_t sockopt_len;
829 # ifdef SCTP_AUTHENTICATION_EVENT
830 # ifdef SCTP_EVENT
831 struct sctp_event event;
832 # else
833 struct sctp_event_subscribe event;
834 # endif
835 # endif
836
837 bio = BIO_new(BIO_s_datagram_sctp());
838 if (bio == NULL)
839 return NULL;
840 BIO_set_fd(bio, fd, close_flag);
841
842 /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
843 auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
844 ret =
845 setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
846 sizeof(struct sctp_authchunk));
847 if (ret < 0) {
848 BIO_vfree(bio);
849 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
850 ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
851 return NULL;
852 }
853 auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
854 ret =
855 setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
856 sizeof(struct sctp_authchunk));
857 if (ret < 0) {
858 BIO_vfree(bio);
859 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
860 ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
861 return NULL;
862 }
863
864 /*
865 * Test if activation was successful. When using accept(), SCTP-AUTH has
866 * to be activated for the listening socket already, otherwise the
867 * connected socket won't use it. Similarly with connect(): the socket
868 * prior to connection must be activated for SCTP-AUTH
869 */
870 sockopt_len = (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
871 authchunks = OPENSSL_zalloc(sockopt_len);
872 if (authchunks == NULL) {
873 BIO_vfree(bio);
874 return NULL;
875 }
876 ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks,
877 &sockopt_len);
878 if (ret < 0) {
879 OPENSSL_free(authchunks);
880 BIO_vfree(bio);
881 return NULL;
882 }
883
884 for (p = (unsigned char *)authchunks->gauth_chunks;
885 p < (unsigned char *)authchunks + sockopt_len;
886 p += sizeof(uint8_t)) {
887 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
888 auth_data = 1;
889 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
890 auth_forward = 1;
891 }
892
893 OPENSSL_free(authchunks);
894
895 if (!auth_data || !auth_forward) {
896 BIO_vfree(bio);
897 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
898 ERR_add_error_data(1,
899 "Ensure SCTP AUTH chunks are enabled on the "
900 "underlying socket");
901 return NULL;
902 }
903
904 # ifdef SCTP_AUTHENTICATION_EVENT
905 # ifdef SCTP_EVENT
906 memset(&event, 0, sizeof(event));
907 event.se_assoc_id = 0;
908 event.se_type = SCTP_AUTHENTICATION_EVENT;
909 event.se_on = 1;
910 ret =
911 setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event,
912 sizeof(struct sctp_event));
913 if (ret < 0) {
914 BIO_vfree(bio);
915 return NULL;
916 }
917 # else
918 sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
919 ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
920 if (ret < 0) {
921 BIO_vfree(bio);
922 return NULL;
923 }
924
925 event.sctp_authentication_event = 1;
926
927 ret =
928 setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
929 sizeof(struct sctp_event_subscribe));
930 if (ret < 0) {
931 BIO_vfree(bio);
932 return NULL;
933 }
934 # endif
935 # endif
936
937 /*
938 * Disable partial delivery by setting the min size larger than the max
939 * record size of 2^14 + 2048 + 13
940 */
941 ret =
942 setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
943 sizeof(optval));
944 if (ret < 0) {
945 BIO_vfree(bio);
946 return NULL;
947 }
948
949 return bio;
950 }
951
952 int BIO_dgram_is_sctp(BIO *bio)
953 {
954 return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
955 }
956
957 static int dgram_sctp_new(BIO *bi)
958 {
959 bio_dgram_sctp_data *data = NULL;
960
961 bi->init = 0;
962 bi->num = 0;
963 data = OPENSSL_zalloc(sizeof(*data));
964 if (data == NULL)
965 return 0;
966 # ifdef SCTP_PR_SCTP_NONE
967 data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
968 # endif
969 bi->ptr = data;
970
971 bi->flags = 0;
972 return 1;
973 }
974
975 static int dgram_sctp_free(BIO *a)
976 {
977 bio_dgram_sctp_data *data;
978
979 if (a == NULL)
980 return 0;
981 if (!dgram_clear(a))
982 return 0;
983
984 data = (bio_dgram_sctp_data *) a->ptr;
985 if (data != NULL)
986 OPENSSL_free(data);
987
988 return 1;
989 }
990
991 # ifdef SCTP_AUTHENTICATION_EVENT
992 void dgram_sctp_handle_auth_free_key_event(BIO *b,
993 union sctp_notification *snp)
994 {
995 int ret;
996 struct sctp_authkey_event *authkeyevent = &snp->sn_auth_event;
997
998 if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY) {
999 struct sctp_authkeyid authkeyid;
1000
1001 /* delete key */
1002 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
1003 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1004 &authkeyid, sizeof(struct sctp_authkeyid));
1005 }
1006 }
1007 # endif
1008
1009 static int dgram_sctp_read(BIO *b, char *out, int outl)
1010 {
1011 int ret = 0, n = 0, i, optval;
1012 socklen_t optlen;
1013 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1014 union sctp_notification *snp;
1015 struct msghdr msg;
1016 struct iovec iov;
1017 struct cmsghdr *cmsg;
1018 char cmsgbuf[512];
1019
1020 if (out != NULL) {
1021 clear_socket_error();
1022
1023 do {
1024 memset(&data->rcvinfo, 0, sizeof(data->rcvinfo));
1025 iov.iov_base = out;
1026 iov.iov_len = outl;
1027 msg.msg_name = NULL;
1028 msg.msg_namelen = 0;
1029 msg.msg_iov = &iov;
1030 msg.msg_iovlen = 1;
1031 msg.msg_control = cmsgbuf;
1032 msg.msg_controllen = 512;
1033 msg.msg_flags = 0;
1034 n = recvmsg(b->num, &msg, 0);
1035
1036 if (n <= 0) {
1037 if (n < 0)
1038 ret = n;
1039 break;
1040 }
1041
1042 if (msg.msg_controllen > 0) {
1043 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
1044 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
1045 if (cmsg->cmsg_level != IPPROTO_SCTP)
1046 continue;
1047 # ifdef SCTP_RCVINFO
1048 if (cmsg->cmsg_type == SCTP_RCVINFO) {
1049 struct sctp_rcvinfo *rcvinfo;
1050
1051 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1052 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1053 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1054 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1055 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1056 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1057 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1058 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1059 }
1060 # endif
1061 # ifdef SCTP_SNDRCV
1062 if (cmsg->cmsg_type == SCTP_SNDRCV) {
1063 struct sctp_sndrcvinfo *sndrcvinfo;
1064
1065 sndrcvinfo =
1066 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1067 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1068 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1069 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1070 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1071 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1072 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1073 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1074 }
1075 # endif
1076 }
1077 }
1078
1079 if (msg.msg_flags & MSG_NOTIFICATION) {
1080 snp = (union sctp_notification *)out;
1081 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
1082 # ifdef SCTP_EVENT
1083 struct sctp_event event;
1084 # else
1085 struct sctp_event_subscribe event;
1086 socklen_t eventsize;
1087 # endif
1088
1089 /* disable sender dry event */
1090 # ifdef SCTP_EVENT
1091 memset(&event, 0, sizeof(event));
1092 event.se_assoc_id = 0;
1093 event.se_type = SCTP_SENDER_DRY_EVENT;
1094 event.se_on = 0;
1095 i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1096 sizeof(struct sctp_event));
1097 if (i < 0) {
1098 ret = i;
1099 break;
1100 }
1101 # else
1102 eventsize = sizeof(struct sctp_event_subscribe);
1103 i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1104 &eventsize);
1105 if (i < 0) {
1106 ret = i;
1107 break;
1108 }
1109
1110 event.sctp_sender_dry_event = 0;
1111
1112 i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1113 sizeof(struct sctp_event_subscribe));
1114 if (i < 0) {
1115 ret = i;
1116 break;
1117 }
1118 # endif
1119 }
1120 # ifdef SCTP_AUTHENTICATION_EVENT
1121 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1122 dgram_sctp_handle_auth_free_key_event(b, snp);
1123 # endif
1124
1125 if (data->handle_notifications != NULL)
1126 data->handle_notifications(b, data->notification_context,
1127 (void *)out);
1128
1129 memset(out, 0, outl);
1130 } else
1131 ret += n;
1132 }
1133 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR)
1134 && (ret < outl));
1135
1136 if (ret > 0 && !(msg.msg_flags & MSG_EOR)) {
1137 /* Partial message read, this should never happen! */
1138
1139 /*
1140 * The buffer was too small, this means the peer sent a message
1141 * that was larger than allowed.
1142 */
1143 if (ret == outl)
1144 return -1;
1145
1146 /*
1147 * Test if socket buffer can handle max record size (2^14 + 2048
1148 * + 13)
1149 */
1150 optlen = (socklen_t) sizeof(int);
1151 ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1152 if (ret >= 0)
1153 OPENSSL_assert(optval >= 18445);
1154
1155 /*
1156 * Test if SCTP doesn't partially deliver below max record size
1157 * (2^14 + 2048 + 13)
1158 */
1159 optlen = (socklen_t) sizeof(int);
1160 ret =
1161 getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1162 &optval, &optlen);
1163 if (ret >= 0)
1164 OPENSSL_assert(optval >= 18445);
1165
1166 /*
1167 * Partially delivered notification??? Probably a bug....
1168 */
1169 OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1170
1171 /*
1172 * Everything seems ok till now, so it's most likely a message
1173 * dropped by PR-SCTP.
1174 */
1175 memset(out, 0, outl);
1176 BIO_set_retry_read(b);
1177 return -1;
1178 }
1179
1180 BIO_clear_retry_flags(b);
1181 if (ret < 0) {
1182 if (BIO_dgram_should_retry(ret)) {
1183 BIO_set_retry_read(b);
1184 data->_errno = get_last_socket_error();
1185 }
1186 }
1187
1188 /* Test if peer uses SCTP-AUTH before continuing */
1189 if (!data->peer_auth_tested) {
1190 int ii, auth_data = 0, auth_forward = 0;
1191 unsigned char *p;
1192 struct sctp_authchunks *authchunks;
1193
1194 optlen =
1195 (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1196 authchunks = OPENSSL_malloc(optlen);
1197 if (authchunks == NULL) {
1198 BIOerr(BIO_F_DGRAM_SCTP_READ, ERR_R_MALLOC_FAILURE);
1199 return -1;
1200 }
1201 memset(authchunks, 0, optlen);
1202 ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS,
1203 authchunks, &optlen);
1204
1205 if (ii >= 0)
1206 for (p = (unsigned char *)authchunks->gauth_chunks;
1207 p < (unsigned char *)authchunks + optlen;
1208 p += sizeof(uint8_t)) {
1209 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
1210 auth_data = 1;
1211 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
1212 auth_forward = 1;
1213 }
1214
1215 OPENSSL_free(authchunks);
1216
1217 if (!auth_data || !auth_forward) {
1218 BIOerr(BIO_F_DGRAM_SCTP_READ, BIO_R_CONNECT_ERROR);
1219 return -1;
1220 }
1221
1222 data->peer_auth_tested = 1;
1223 }
1224 }
1225 return ret;
1226 }
1227
1228 /*
1229 * dgram_sctp_write - send message on SCTP socket
1230 * @b: BIO to write to
1231 * @in: data to send
1232 * @inl: amount of bytes in @in to send
1233 *
1234 * Returns -1 on error or the sent amount of bytes on success
1235 */
1236 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1237 {
1238 int ret;
1239 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1240 struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1241 struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1242 struct bio_dgram_sctp_sndinfo handshake_sinfo;
1243 struct iovec iov[1];
1244 struct msghdr msg;
1245 struct cmsghdr *cmsg;
1246 # if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1247 char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) +
1248 CMSG_SPACE(sizeof(struct sctp_prinfo))];
1249 struct sctp_sndinfo *sndinfo;
1250 struct sctp_prinfo *prinfo;
1251 # else
1252 char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1253 struct sctp_sndrcvinfo *sndrcvinfo;
1254 # endif
1255
1256 clear_socket_error();
1257
1258 /*
1259 * If we're send anything else than application data, disable all user
1260 * parameters and flags.
1261 */
1262 if (in[0] != 23) {
1263 memset(&handshake_sinfo, 0, sizeof(handshake_sinfo));
1264 # ifdef SCTP_SACK_IMMEDIATELY
1265 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1266 # endif
1267 sinfo = &handshake_sinfo;
1268 }
1269
1270 /* We can only send a shutdown alert if the socket is dry */
1271 if (data->save_shutdown) {
1272 ret = BIO_dgram_sctp_wait_for_dry(b);
1273 if (ret < 0)
1274 return -1;
1275 if (ret == 0) {
1276 BIO_clear_retry_flags(b);
1277 BIO_set_retry_write(b);
1278 return -1;
1279 }
1280 }
1281
1282 iov[0].iov_base = (char *)in;
1283 iov[0].iov_len = inl;
1284 msg.msg_name = NULL;
1285 msg.msg_namelen = 0;
1286 msg.msg_iov = iov;
1287 msg.msg_iovlen = 1;
1288 msg.msg_control = (caddr_t) cmsgbuf;
1289 msg.msg_controllen = 0;
1290 msg.msg_flags = 0;
1291 # if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1292 cmsg = (struct cmsghdr *)cmsgbuf;
1293 cmsg->cmsg_level = IPPROTO_SCTP;
1294 cmsg->cmsg_type = SCTP_SNDINFO;
1295 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1296 sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1297 memset(sndinfo, 0, sizeof(*sndinfo));
1298 sndinfo->snd_sid = sinfo->snd_sid;
1299 sndinfo->snd_flags = sinfo->snd_flags;
1300 sndinfo->snd_ppid = sinfo->snd_ppid;
1301 sndinfo->snd_context = sinfo->snd_context;
1302 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1303
1304 cmsg =
1305 (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1306 cmsg->cmsg_level = IPPROTO_SCTP;
1307 cmsg->cmsg_type = SCTP_PRINFO;
1308 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1309 prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1310 memset(prinfo, 0, sizeof(*prinfo));
1311 prinfo->pr_policy = pinfo->pr_policy;
1312 prinfo->pr_value = pinfo->pr_value;
1313 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1314 # else
1315 cmsg = (struct cmsghdr *)cmsgbuf;
1316 cmsg->cmsg_level = IPPROTO_SCTP;
1317 cmsg->cmsg_type = SCTP_SNDRCV;
1318 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1319 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1320 memset(sndrcvinfo, 0, sizeof(*sndrcvinfo));
1321 sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1322 sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1323 # ifdef __FreeBSD__
1324 sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1325 # endif
1326 sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1327 sndrcvinfo->sinfo_context = sinfo->snd_context;
1328 sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1329 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1330 # endif
1331
1332 ret = sendmsg(b->num, &msg, 0);
1333
1334 BIO_clear_retry_flags(b);
1335 if (ret <= 0) {
1336 if (BIO_dgram_should_retry(ret)) {
1337 BIO_set_retry_write(b);
1338 data->_errno = get_last_socket_error();
1339 }
1340 }
1341 return ret;
1342 }
1343
1344 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1345 {
1346 long ret = 1;
1347 bio_dgram_sctp_data *data = NULL;
1348 socklen_t sockopt_len = 0;
1349 struct sctp_authkeyid authkeyid;
1350 struct sctp_authkey *authkey = NULL;
1351
1352 data = (bio_dgram_sctp_data *) b->ptr;
1353
1354 switch (cmd) {
1355 case BIO_CTRL_DGRAM_QUERY_MTU:
1356 /*
1357 * Set to maximum (2^14) and ignore user input to enable transport
1358 * protocol fragmentation. Returns always 2^14.
1359 */
1360 data->mtu = 16384;
1361 ret = data->mtu;
1362 break;
1363 case BIO_CTRL_DGRAM_SET_MTU:
1364 /*
1365 * Set to maximum (2^14) and ignore input to enable transport
1366 * protocol fragmentation. Returns always 2^14.
1367 */
1368 data->mtu = 16384;
1369 ret = data->mtu;
1370 break;
1371 case BIO_CTRL_DGRAM_SET_CONNECTED:
1372 case BIO_CTRL_DGRAM_CONNECT:
1373 /* Returns always -1. */
1374 ret = -1;
1375 break;
1376 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1377 /*
1378 * SCTP doesn't need the DTLS timer Returns always 1.
1379 */
1380 break;
1381 case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
1382 /*
1383 * We allow transport protocol fragmentation so this is irrelevant
1384 */
1385 ret = 0;
1386 break;
1387 case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1388 if (num > 0)
1389 data->in_handshake = 1;
1390 else
1391 data->in_handshake = 0;
1392
1393 ret =
1394 setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY,
1395 &data->in_handshake, sizeof(int));
1396 break;
1397 case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1398 /*
1399 * New shared key for SCTP AUTH. Returns 0 on success, -1 otherwise.
1400 */
1401
1402 /* Get active key */
1403 sockopt_len = sizeof(struct sctp_authkeyid);
1404 ret =
1405 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
1406 &sockopt_len);
1407 if (ret < 0)
1408 break;
1409
1410 /* Add new key */
1411 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1412 authkey = OPENSSL_malloc(sockopt_len);
1413 if (authkey == NULL) {
1414 ret = -1;
1415 break;
1416 }
1417 memset(authkey, 0, sockopt_len);
1418 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1419 # ifndef __FreeBSD__
1420 /*
1421 * This field is missing in FreeBSD 8.2 and earlier, and FreeBSD 8.3
1422 * and higher work without it.
1423 */
1424 authkey->sca_keylength = 64;
1425 # endif
1426 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1427
1428 ret =
1429 setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey,
1430 sockopt_len);
1431 OPENSSL_free(authkey);
1432 authkey = NULL;
1433 if (ret < 0)
1434 break;
1435
1436 /* Reset active key */
1437 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1438 &authkeyid, sizeof(struct sctp_authkeyid));
1439 if (ret < 0)
1440 break;
1441
1442 break;
1443 case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1444 /* Returns 0 on success, -1 otherwise. */
1445
1446 /* Get active key */
1447 sockopt_len = sizeof(struct sctp_authkeyid);
1448 ret =
1449 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
1450 &sockopt_len);
1451 if (ret < 0)
1452 break;
1453
1454 /* Set active key */
1455 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1456 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1457 &authkeyid, sizeof(struct sctp_authkeyid));
1458 if (ret < 0)
1459 break;
1460
1461 /*
1462 * CCS has been sent, so remember that and fall through to check if
1463 * we need to deactivate an old key
1464 */
1465 data->ccs_sent = 1;
1466
1467 case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1468 /* Returns 0 on success, -1 otherwise. */
1469
1470 /*
1471 * Has this command really been called or is this just a
1472 * fall-through?
1473 */
1474 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1475 data->ccs_rcvd = 1;
1476
1477 /*
1478 * CSS has been both, received and sent, so deactivate an old key
1479 */
1480 if (data->ccs_rcvd == 1 && data->ccs_sent == 1) {
1481 /* Get active key */
1482 sockopt_len = sizeof(struct sctp_authkeyid);
1483 ret =
1484 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1485 &authkeyid, &sockopt_len);
1486 if (ret < 0)
1487 break;
1488
1489 /*
1490 * Deactivate key or delete second last key if
1491 * SCTP_AUTHENTICATION_EVENT is not available.
1492 */
1493 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1494 # ifdef SCTP_AUTH_DEACTIVATE_KEY
1495 sockopt_len = sizeof(struct sctp_authkeyid);
1496 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1497 &authkeyid, sockopt_len);
1498 if (ret < 0)
1499 break;
1500 # endif
1501 # ifndef SCTP_AUTHENTICATION_EVENT
1502 if (authkeyid.scact_keynumber > 0) {
1503 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1504 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1505 &authkeyid, sizeof(struct sctp_authkeyid));
1506 if (ret < 0)
1507 break;
1508 }
1509 # endif
1510
1511 data->ccs_rcvd = 0;
1512 data->ccs_sent = 0;
1513 }
1514 break;
1515 case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1516 /* Returns the size of the copied struct. */
1517 if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
1518 num = sizeof(struct bio_dgram_sctp_sndinfo);
1519
1520 memcpy(ptr, &(data->sndinfo), num);
1521 ret = num;
1522 break;
1523 case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1524 /* Returns the size of the copied struct. */
1525 if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
1526 num = sizeof(struct bio_dgram_sctp_sndinfo);
1527
1528 memcpy(&(data->sndinfo), ptr, num);
1529 break;
1530 case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1531 /* Returns the size of the copied struct. */
1532 if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
1533 num = sizeof(struct bio_dgram_sctp_rcvinfo);
1534
1535 memcpy(ptr, &data->rcvinfo, num);
1536
1537 ret = num;
1538 break;
1539 case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1540 /* Returns the size of the copied struct. */
1541 if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
1542 num = sizeof(struct bio_dgram_sctp_rcvinfo);
1543
1544 memcpy(&(data->rcvinfo), ptr, num);
1545 break;
1546 case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1547 /* Returns the size of the copied struct. */
1548 if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
1549 num = sizeof(struct bio_dgram_sctp_prinfo);
1550
1551 memcpy(ptr, &(data->prinfo), num);
1552 ret = num;
1553 break;
1554 case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1555 /* Returns the size of the copied struct. */
1556 if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
1557 num = sizeof(struct bio_dgram_sctp_prinfo);
1558
1559 memcpy(&(data->prinfo), ptr, num);
1560 break;
1561 case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1562 /* Returns always 1. */
1563 if (num > 0)
1564 data->save_shutdown = 1;
1565 else
1566 data->save_shutdown = 0;
1567 break;
1568
1569 default:
1570 /*
1571 * Pass to default ctrl function to process SCTP unspecific commands
1572 */
1573 ret = dgram_ctrl(b, cmd, num, ptr);
1574 break;
1575 }
1576 return ret;
1577 }
1578
1579 int BIO_dgram_sctp_notification_cb(BIO *b,
1580 void (*handle_notifications) (BIO *bio,
1581 void
1582 *context,
1583 void *buf),
1584 void *context)
1585 {
1586 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1587
1588 if (handle_notifications != NULL) {
1589 data->handle_notifications = handle_notifications;
1590 data->notification_context = context;
1591 } else
1592 return -1;
1593
1594 return 0;
1595 }
1596
1597 /*
1598 * BIO_dgram_sctp_wait_for_dry - Wait for SCTP SENDER_DRY event
1599 * @b: The BIO to check for the dry event
1600 *
1601 * Wait until the peer confirms all packets have been received, and so that
1602 * our kernel doesn't have anything to send anymore. This is only received by
1603 * the peer's kernel, not the application.
1604 *
1605 * Returns:
1606 * -1 on error
1607 * 0 when not dry yet
1608 * 1 when dry
1609 */
1610 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1611 {
1612 int is_dry = 0;
1613 int sockflags = 0;
1614 int n, ret;
1615 union sctp_notification snp;
1616 struct msghdr msg;
1617 struct iovec iov;
1618 # ifdef SCTP_EVENT
1619 struct sctp_event event;
1620 # else
1621 struct sctp_event_subscribe event;
1622 socklen_t eventsize;
1623 # endif
1624 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1625
1626 /* set sender dry event */
1627 # ifdef SCTP_EVENT
1628 memset(&event, 0, sizeof(event));
1629 event.se_assoc_id = 0;
1630 event.se_type = SCTP_SENDER_DRY_EVENT;
1631 event.se_on = 1;
1632 ret =
1633 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1634 sizeof(struct sctp_event));
1635 # else
1636 eventsize = sizeof(struct sctp_event_subscribe);
1637 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1638 if (ret < 0)
1639 return -1;
1640
1641 event.sctp_sender_dry_event = 1;
1642
1643 ret =
1644 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1645 sizeof(struct sctp_event_subscribe));
1646 # endif
1647 if (ret < 0)
1648 return -1;
1649
1650 /* peek for notification */
1651 memset(&snp, 0, sizeof(snp));
1652 iov.iov_base = (char *)&snp;
1653 iov.iov_len = sizeof(union sctp_notification);
1654 msg.msg_name = NULL;
1655 msg.msg_namelen = 0;
1656 msg.msg_iov = &iov;
1657 msg.msg_iovlen = 1;
1658 msg.msg_control = NULL;
1659 msg.msg_controllen = 0;
1660 msg.msg_flags = 0;
1661
1662 n = recvmsg(b->num, &msg, MSG_PEEK);
1663 if (n <= 0) {
1664 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1665 && (get_last_socket_error() != EWOULDBLOCK))
1666 return -1;
1667 else
1668 return 0;
1669 }
1670
1671 /* if we find a notification, process it and try again if necessary */
1672 while (msg.msg_flags & MSG_NOTIFICATION) {
1673 memset(&snp, 0, sizeof(snp));
1674 iov.iov_base = (char *)&snp;
1675 iov.iov_len = sizeof(union sctp_notification);
1676 msg.msg_name = NULL;
1677 msg.msg_namelen = 0;
1678 msg.msg_iov = &iov;
1679 msg.msg_iovlen = 1;
1680 msg.msg_control = NULL;
1681 msg.msg_controllen = 0;
1682 msg.msg_flags = 0;
1683
1684 n = recvmsg(b->num, &msg, 0);
1685 if (n <= 0) {
1686 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1687 && (get_last_socket_error() != EWOULDBLOCK))
1688 return -1;
1689 else
1690 return is_dry;
1691 }
1692
1693 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
1694 is_dry = 1;
1695
1696 /* disable sender dry event */
1697 # ifdef SCTP_EVENT
1698 memset(&event, 0, sizeof(event));
1699 event.se_assoc_id = 0;
1700 event.se_type = SCTP_SENDER_DRY_EVENT;
1701 event.se_on = 0;
1702 ret =
1703 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1704 sizeof(struct sctp_event));
1705 # else
1706 eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1707 ret =
1708 getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1709 &eventsize);
1710 if (ret < 0)
1711 return -1;
1712
1713 event.sctp_sender_dry_event = 0;
1714
1715 ret =
1716 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1717 sizeof(struct sctp_event_subscribe));
1718 # endif
1719 if (ret < 0)
1720 return -1;
1721 }
1722 # ifdef SCTP_AUTHENTICATION_EVENT
1723 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1724 dgram_sctp_handle_auth_free_key_event(b, &snp);
1725 # endif
1726
1727 if (data->handle_notifications != NULL)
1728 data->handle_notifications(b, data->notification_context,
1729 (void *)&snp);
1730
1731 /* found notification, peek again */
1732 memset(&snp, 0, sizeof(snp));
1733 iov.iov_base = (char *)&snp;
1734 iov.iov_len = sizeof(union sctp_notification);
1735 msg.msg_name = NULL;
1736 msg.msg_namelen = 0;
1737 msg.msg_iov = &iov;
1738 msg.msg_iovlen = 1;
1739 msg.msg_control = NULL;
1740 msg.msg_controllen = 0;
1741 msg.msg_flags = 0;
1742
1743 /* if we have seen the dry already, don't wait */
1744 if (is_dry) {
1745 sockflags = fcntl(b->num, F_GETFL, 0);
1746 fcntl(b->num, F_SETFL, O_NONBLOCK);
1747 }
1748
1749 n = recvmsg(b->num, &msg, MSG_PEEK);
1750
1751 if (is_dry) {
1752 fcntl(b->num, F_SETFL, sockflags);
1753 }
1754
1755 if (n <= 0) {
1756 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1757 && (get_last_socket_error() != EWOULDBLOCK))
1758 return -1;
1759 else
1760 return is_dry;
1761 }
1762 }
1763
1764 /* read anything else */
1765 return is_dry;
1766 }
1767
1768 int BIO_dgram_sctp_msg_waiting(BIO *b)
1769 {
1770 int n, sockflags;
1771 union sctp_notification snp;
1772 struct msghdr msg;
1773 struct iovec iov;
1774 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1775
1776 /* Check if there are any messages waiting to be read */
1777 do {
1778 memset(&snp, 0, sizeof(snp));
1779 iov.iov_base = (char *)&snp;
1780 iov.iov_len = sizeof(union sctp_notification);
1781 msg.msg_name = NULL;
1782 msg.msg_namelen = 0;
1783 msg.msg_iov = &iov;
1784 msg.msg_iovlen = 1;
1785 msg.msg_control = NULL;
1786 msg.msg_controllen = 0;
1787 msg.msg_flags = 0;
1788
1789 sockflags = fcntl(b->num, F_GETFL, 0);
1790 fcntl(b->num, F_SETFL, O_NONBLOCK);
1791 n = recvmsg(b->num, &msg, MSG_PEEK);
1792 fcntl(b->num, F_SETFL, sockflags);
1793
1794 /* if notification, process and try again */
1795 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION)) {
1796 # ifdef SCTP_AUTHENTICATION_EVENT
1797 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1798 dgram_sctp_handle_auth_free_key_event(b, &snp);
1799 # endif
1800
1801 memset(&snp, 0, sizeof(snp));
1802 iov.iov_base = (char *)&snp;
1803 iov.iov_len = sizeof(union sctp_notification);
1804 msg.msg_name = NULL;
1805 msg.msg_namelen = 0;
1806 msg.msg_iov = &iov;
1807 msg.msg_iovlen = 1;
1808 msg.msg_control = NULL;
1809 msg.msg_controllen = 0;
1810 msg.msg_flags = 0;
1811 n = recvmsg(b->num, &msg, 0);
1812
1813 if (data->handle_notifications != NULL)
1814 data->handle_notifications(b, data->notification_context,
1815 (void *)&snp);
1816 }
1817
1818 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1819
1820 /* Return 1 if there is a message to be read, return 0 otherwise. */
1821 if (n > 0)
1822 return 1;
1823 else
1824 return 0;
1825 }
1826
1827 static int dgram_sctp_puts(BIO *bp, const char *str)
1828 {
1829 int n, ret;
1830
1831 n = strlen(str);
1832 ret = dgram_sctp_write(bp, str, n);
1833 return ret;
1834 }
1835 # endif
1836
1837 static int BIO_dgram_should_retry(int i)
1838 {
1839 int err;
1840
1841 if ((i == 0) || (i == -1)) {
1842 err = get_last_socket_error();
1843
1844 # if defined(OPENSSL_SYS_WINDOWS)
1845 /*
1846 * If the socket return value (i) is -1 and err is unexpectedly 0 at
1847 * this point, the error code was overwritten by another system call
1848 * before this error handling is called.
1849 */
1850 # endif
1851
1852 return BIO_dgram_non_fatal_error(err);
1853 }
1854 return 0;
1855 }
1856
1857 int BIO_dgram_non_fatal_error(int err)
1858 {
1859 switch (err) {
1860 # if defined(OPENSSL_SYS_WINDOWS)
1861 # if defined(WSAEWOULDBLOCK)
1862 case WSAEWOULDBLOCK:
1863 # endif
1864 # endif
1865
1866 # ifdef EWOULDBLOCK
1867 # ifdef WSAEWOULDBLOCK
1868 # if WSAEWOULDBLOCK != EWOULDBLOCK
1869 case EWOULDBLOCK:
1870 # endif
1871 # else
1872 case EWOULDBLOCK:
1873 # endif
1874 # endif
1875
1876 # ifdef EINTR
1877 case EINTR:
1878 # endif
1879
1880 # ifdef EAGAIN
1881 # if EWOULDBLOCK != EAGAIN
1882 case EAGAIN:
1883 # endif
1884 # endif
1885
1886 # ifdef EPROTO
1887 case EPROTO:
1888 # endif
1889
1890 # ifdef EINPROGRESS
1891 case EINPROGRESS:
1892 # endif
1893
1894 # ifdef EALREADY
1895 case EALREADY:
1896 # endif
1897
1898 return 1;
1899 default:
1900 break;
1901 }
1902 return 0;
1903 }
1904
1905 static void get_current_time(struct timeval *t)
1906 {
1907 # if defined(_WIN32)
1908 SYSTEMTIME st;
1909 union {
1910 unsigned __int64 ul;
1911 FILETIME ft;
1912 } now;
1913
1914 GetSystemTime(&st);
1915 SystemTimeToFileTime(&st, &now.ft);
1916 # ifdef __MINGW32__
1917 now.ul -= 116444736000000000ULL;
1918 # else
1919 now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
1920 # endif
1921 t->tv_sec = (long)(now.ul / 10000000);
1922 t->tv_usec = ((int)(now.ul % 10000000)) / 10;
1923 # else
1924 gettimeofday(t, NULL);
1925 # endif
1926 }
1927
1928 #endif
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