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[thirdparty/openssl.git] / crypto / bio / bss_dgram.c
1 /*
2 * Copyright 2005-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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, /* dgram_callback_ctrl */
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, /* dgram_callback_ctrl */
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 ret = sendto(b->num, in, inl, 0,
343 BIO_ADDR_sockaddr(&data->peer), peerlen);
344 }
345
346 BIO_clear_retry_flags(b);
347 if (ret <= 0) {
348 if (BIO_dgram_should_retry(ret)) {
349 BIO_set_retry_write(b);
350 data->_errno = get_last_socket_error();
351 }
352 }
353 return ret;
354 }
355
356 static long dgram_get_mtu_overhead(bio_dgram_data *data)
357 {
358 long ret;
359
360 switch (BIO_ADDR_family(&data->peer)) {
361 case AF_INET:
362 /*
363 * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
364 */
365 ret = 28;
366 break;
367 # if OPENSSL_USE_IPV6
368 case AF_INET6:
369 {
370 # ifdef IN6_IS_ADDR_V4MAPPED
371 struct in6_addr tmp_addr;
372 if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
373 && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
374 /*
375 * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
376 */
377 ret = 28;
378 else
379 # endif
380 /*
381 * Assume this is UDP - 40 bytes for IP, 8 bytes for UDP
382 */
383 ret = 48;
384 }
385 break;
386 # endif
387 default:
388 /* We don't know. Go with the historical default */
389 ret = 28;
390 break;
391 }
392 return ret;
393 }
394
395 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
396 {
397 long ret = 1;
398 int *ip;
399 bio_dgram_data *data = NULL;
400 int sockopt_val = 0;
401 int d_errno;
402 # if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
403 socklen_t sockopt_len; /* assume that system supporting IP_MTU is
404 * modern enough to define socklen_t */
405 socklen_t addr_len;
406 BIO_ADDR addr;
407 # endif
408
409 data = (bio_dgram_data *)b->ptr;
410
411 switch (cmd) {
412 case BIO_CTRL_RESET:
413 num = 0;
414 ret = 0;
415 break;
416 case BIO_CTRL_INFO:
417 ret = 0;
418 break;
419 case BIO_C_SET_FD:
420 dgram_clear(b);
421 b->num = *((int *)ptr);
422 b->shutdown = (int)num;
423 b->init = 1;
424 break;
425 case BIO_C_GET_FD:
426 if (b->init) {
427 ip = (int *)ptr;
428 if (ip != NULL)
429 *ip = b->num;
430 ret = b->num;
431 } else
432 ret = -1;
433 break;
434 case BIO_CTRL_GET_CLOSE:
435 ret = b->shutdown;
436 break;
437 case BIO_CTRL_SET_CLOSE:
438 b->shutdown = (int)num;
439 break;
440 case BIO_CTRL_PENDING:
441 case BIO_CTRL_WPENDING:
442 ret = 0;
443 break;
444 case BIO_CTRL_DUP:
445 case BIO_CTRL_FLUSH:
446 ret = 1;
447 break;
448 case BIO_CTRL_DGRAM_CONNECT:
449 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
450 break;
451 /* (Linux)kernel sets DF bit on outgoing IP packets */
452 case BIO_CTRL_DGRAM_MTU_DISCOVER:
453 # if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
454 addr_len = (socklen_t) sizeof(addr);
455 memset(&addr, 0, sizeof(addr));
456 if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
457 ret = 0;
458 break;
459 }
460 switch (addr.sa.sa_family) {
461 case AF_INET:
462 sockopt_val = IP_PMTUDISC_DO;
463 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
464 &sockopt_val, sizeof(sockopt_val))) < 0)
465 perror("setsockopt");
466 break;
467 # if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
468 case AF_INET6:
469 sockopt_val = IPV6_PMTUDISC_DO;
470 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
471 &sockopt_val, sizeof(sockopt_val))) < 0)
472 perror("setsockopt");
473 break;
474 # endif
475 default:
476 ret = -1;
477 break;
478 }
479 # else
480 ret = -1;
481 # endif
482 break;
483 case BIO_CTRL_DGRAM_QUERY_MTU:
484 # if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
485 addr_len = (socklen_t) sizeof(addr);
486 memset(&addr, 0, sizeof(addr));
487 if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
488 ret = 0;
489 break;
490 }
491 sockopt_len = sizeof(sockopt_val);
492 switch (addr.sa.sa_family) {
493 case AF_INET:
494 if ((ret =
495 getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
496 &sockopt_len)) < 0 || sockopt_val < 0) {
497 ret = 0;
498 } else {
499 /*
500 * we assume that the transport protocol is UDP and no IP
501 * options are used.
502 */
503 data->mtu = sockopt_val - 8 - 20;
504 ret = data->mtu;
505 }
506 break;
507 # if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
508 case AF_INET6:
509 if ((ret =
510 getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
511 (void *)&sockopt_val, &sockopt_len)) < 0
512 || sockopt_val < 0) {
513 ret = 0;
514 } else {
515 /*
516 * we assume that the transport protocol is UDP and no IPV6
517 * options are used.
518 */
519 data->mtu = sockopt_val - 8 - 40;
520 ret = data->mtu;
521 }
522 break;
523 # endif
524 default:
525 ret = 0;
526 break;
527 }
528 # else
529 ret = 0;
530 # endif
531 break;
532 case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
533 ret = -dgram_get_mtu_overhead(data);
534 switch (BIO_ADDR_family(&data->peer)) {
535 case AF_INET:
536 ret += 576;
537 break;
538 # if OPENSSL_USE_IPV6
539 case AF_INET6:
540 {
541 # ifdef IN6_IS_ADDR_V4MAPPED
542 struct in6_addr tmp_addr;
543 if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
544 && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
545 ret += 576;
546 else
547 # endif
548 ret += 1280;
549 }
550 break;
551 # endif
552 default:
553 ret += 576;
554 break;
555 }
556 break;
557 case BIO_CTRL_DGRAM_GET_MTU:
558 return data->mtu;
559 case BIO_CTRL_DGRAM_SET_MTU:
560 data->mtu = num;
561 ret = num;
562 break;
563 case BIO_CTRL_DGRAM_SET_CONNECTED:
564 if (ptr != NULL) {
565 data->connected = 1;
566 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
567 } else {
568 data->connected = 0;
569 memset(&data->peer, 0, sizeof(data->peer));
570 }
571 break;
572 case BIO_CTRL_DGRAM_GET_PEER:
573 ret = BIO_ADDR_sockaddr_size(&data->peer);
574 /* FIXME: if num < ret, we will only return part of an address.
575 That should bee an error, no? */
576 if (num == 0 || num > ret)
577 num = ret;
578 memcpy(ptr, &data->peer, (ret = num));
579 break;
580 case BIO_CTRL_DGRAM_SET_PEER:
581 BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
582 break;
583 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
584 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval));
585 break;
586 # if defined(SO_RCVTIMEO)
587 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
588 # ifdef OPENSSL_SYS_WINDOWS
589 {
590 struct timeval *tv = (struct timeval *)ptr;
591 int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
592 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
593 (void *)&timeout, sizeof(timeout)) < 0) {
594 perror("setsockopt");
595 ret = -1;
596 }
597 }
598 # else
599 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
600 sizeof(struct timeval)) < 0) {
601 perror("setsockopt");
602 ret = -1;
603 }
604 # endif
605 break;
606 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
607 {
608 union {
609 size_t s;
610 int i;
611 } sz = {
612 0
613 };
614 # ifdef OPENSSL_SYS_WINDOWS
615 int timeout;
616 struct timeval *tv = (struct timeval *)ptr;
617
618 sz.i = sizeof(timeout);
619 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
620 (void *)&timeout, &sz.i) < 0) {
621 perror("getsockopt");
622 ret = -1;
623 } else {
624 tv->tv_sec = timeout / 1000;
625 tv->tv_usec = (timeout % 1000) * 1000;
626 ret = sizeof(*tv);
627 }
628 # else
629 sz.i = sizeof(struct timeval);
630 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
631 ptr, (void *)&sz) < 0) {
632 perror("getsockopt");
633 ret = -1;
634 } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
635 OPENSSL_assert(sz.s <= sizeof(struct timeval));
636 ret = (int)sz.s;
637 } else
638 ret = sz.i;
639 # endif
640 }
641 break;
642 # endif
643 # if defined(SO_SNDTIMEO)
644 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
645 # ifdef OPENSSL_SYS_WINDOWS
646 {
647 struct timeval *tv = (struct timeval *)ptr;
648 int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
649 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
650 (void *)&timeout, sizeof(timeout)) < 0) {
651 perror("setsockopt");
652 ret = -1;
653 }
654 }
655 # else
656 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
657 sizeof(struct timeval)) < 0) {
658 perror("setsockopt");
659 ret = -1;
660 }
661 # endif
662 break;
663 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
664 {
665 union {
666 size_t s;
667 int i;
668 } sz = {
669 0
670 };
671 # ifdef OPENSSL_SYS_WINDOWS
672 int timeout;
673 struct timeval *tv = (struct timeval *)ptr;
674
675 sz.i = sizeof(timeout);
676 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
677 (void *)&timeout, &sz.i) < 0) {
678 perror("getsockopt");
679 ret = -1;
680 } else {
681 tv->tv_sec = timeout / 1000;
682 tv->tv_usec = (timeout % 1000) * 1000;
683 ret = sizeof(*tv);
684 }
685 # else
686 sz.i = sizeof(struct timeval);
687 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
688 ptr, (void *)&sz) < 0) {
689 perror("getsockopt");
690 ret = -1;
691 } else if (sizeof(sz.s) != sizeof(sz.i) && sz.i == 0) {
692 OPENSSL_assert(sz.s <= sizeof(struct timeval));
693 ret = (int)sz.s;
694 } else
695 ret = sz.i;
696 # endif
697 }
698 break;
699 # endif
700 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
701 /* fall-through */
702 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
703 # ifdef OPENSSL_SYS_WINDOWS
704 d_errno = (data->_errno == WSAETIMEDOUT);
705 # else
706 d_errno = (data->_errno == EAGAIN);
707 # endif
708 if (d_errno) {
709 ret = 1;
710 data->_errno = 0;
711 } else
712 ret = 0;
713 break;
714 # ifdef EMSGSIZE
715 case BIO_CTRL_DGRAM_MTU_EXCEEDED:
716 if (data->_errno == EMSGSIZE) {
717 ret = 1;
718 data->_errno = 0;
719 } else
720 ret = 0;
721 break;
722 # endif
723 case BIO_CTRL_DGRAM_SET_DONT_FRAG:
724 sockopt_val = num ? 1 : 0;
725
726 switch (data->peer.sa.sa_family) {
727 case AF_INET:
728 # if defined(IP_DONTFRAG)
729 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
730 &sockopt_val, sizeof(sockopt_val))) < 0) {
731 perror("setsockopt");
732 ret = -1;
733 }
734 # elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined (IP_PMTUDISC_PROBE)
735 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
736 (ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
737 &sockopt_val, sizeof(sockopt_val))) < 0) {
738 perror("setsockopt");
739 ret = -1;
740 }
741 # elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
742 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
743 (const char *)&sockopt_val,
744 sizeof(sockopt_val))) < 0) {
745 perror("setsockopt");
746 ret = -1;
747 }
748 # else
749 ret = -1;
750 # endif
751 break;
752 # if OPENSSL_USE_IPV6
753 case AF_INET6:
754 # if defined(IPV6_DONTFRAG)
755 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
756 (const void *)&sockopt_val,
757 sizeof(sockopt_val))) < 0) {
758 perror("setsockopt");
759 ret = -1;
760 }
761 # elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
762 if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
763 (ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
764 &sockopt_val, sizeof(sockopt_val))) < 0) {
765 perror("setsockopt");
766 ret = -1;
767 }
768 # else
769 ret = -1;
770 # endif
771 break;
772 # endif
773 default:
774 ret = -1;
775 break;
776 }
777 break;
778 case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
779 ret = dgram_get_mtu_overhead(data);
780 break;
781
782 /*
783 * BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE is used here for compatibility
784 * reasons. When BIO_CTRL_DGRAM_SET_PEEK_MODE was first defined its value
785 * was incorrectly clashing with BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE. The
786 * value has been updated to a non-clashing value. However to preserve
787 * binary compatibility we now respond to both the old value and the new one
788 */
789 case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
790 case BIO_CTRL_DGRAM_SET_PEEK_MODE:
791 data->peekmode = (unsigned int)num;
792 break;
793 default:
794 ret = 0;
795 break;
796 }
797 return ret;
798 }
799
800 static int dgram_puts(BIO *bp, const char *str)
801 {
802 int n, ret;
803
804 n = strlen(str);
805 ret = dgram_write(bp, str, n);
806 return ret;
807 }
808
809 # ifndef OPENSSL_NO_SCTP
810 const BIO_METHOD *BIO_s_datagram_sctp(void)
811 {
812 return &methods_dgramp_sctp;
813 }
814
815 BIO *BIO_new_dgram_sctp(int fd, int close_flag)
816 {
817 BIO *bio;
818 int ret, optval = 20000;
819 int auth_data = 0, auth_forward = 0;
820 unsigned char *p;
821 struct sctp_authchunk auth;
822 struct sctp_authchunks *authchunks;
823 socklen_t sockopt_len;
824 # ifdef SCTP_AUTHENTICATION_EVENT
825 # ifdef SCTP_EVENT
826 struct sctp_event event;
827 # else
828 struct sctp_event_subscribe event;
829 # endif
830 # endif
831
832 bio = BIO_new(BIO_s_datagram_sctp());
833 if (bio == NULL)
834 return NULL;
835 BIO_set_fd(bio, fd, close_flag);
836
837 /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
838 auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
839 ret =
840 setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
841 sizeof(struct sctp_authchunk));
842 if (ret < 0) {
843 BIO_vfree(bio);
844 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
845 ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
846 return NULL;
847 }
848 auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
849 ret =
850 setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
851 sizeof(struct sctp_authchunk));
852 if (ret < 0) {
853 BIO_vfree(bio);
854 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
855 ERR_add_error_data(1, "Ensure SCTP AUTH chunks are enabled in kernel");
856 return NULL;
857 }
858
859 /*
860 * Test if activation was successful. When using accept(), SCTP-AUTH has
861 * to be activated for the listening socket already, otherwise the
862 * connected socket won't use it. Similarly with connect(): the socket
863 * prior to connection must be activated for SCTP-AUTH
864 */
865 sockopt_len = (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
866 authchunks = OPENSSL_zalloc(sockopt_len);
867 if (authchunks == NULL) {
868 BIO_vfree(bio);
869 return NULL;
870 }
871 ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks,
872 &sockopt_len);
873 if (ret < 0) {
874 OPENSSL_free(authchunks);
875 BIO_vfree(bio);
876 return NULL;
877 }
878
879 for (p = (unsigned char *)authchunks->gauth_chunks;
880 p < (unsigned char *)authchunks + sockopt_len;
881 p += sizeof(uint8_t)) {
882 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
883 auth_data = 1;
884 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
885 auth_forward = 1;
886 }
887
888 OPENSSL_free(authchunks);
889
890 if (!auth_data || !auth_forward) {
891 BIO_vfree(bio);
892 BIOerr(BIO_F_BIO_NEW_DGRAM_SCTP, ERR_R_SYS_LIB);
893 ERR_add_error_data(1,
894 "Ensure SCTP AUTH chunks are enabled on the "
895 "underlying socket");
896 return NULL;
897 }
898
899 # ifdef SCTP_AUTHENTICATION_EVENT
900 # ifdef SCTP_EVENT
901 memset(&event, 0, sizeof(event));
902 event.se_assoc_id = 0;
903 event.se_type = SCTP_AUTHENTICATION_EVENT;
904 event.se_on = 1;
905 ret =
906 setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event,
907 sizeof(struct sctp_event));
908 if (ret < 0) {
909 BIO_vfree(bio);
910 return NULL;
911 }
912 # else
913 sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
914 ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
915 if (ret < 0) {
916 BIO_vfree(bio);
917 return NULL;
918 }
919
920 event.sctp_authentication_event = 1;
921
922 ret =
923 setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
924 sizeof(struct sctp_event_subscribe));
925 if (ret < 0) {
926 BIO_vfree(bio);
927 return NULL;
928 }
929 # endif
930 # endif
931
932 /*
933 * Disable partial delivery by setting the min size larger than the max
934 * record size of 2^14 + 2048 + 13
935 */
936 ret =
937 setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
938 sizeof(optval));
939 if (ret < 0) {
940 BIO_vfree(bio);
941 return NULL;
942 }
943
944 return bio;
945 }
946
947 int BIO_dgram_is_sctp(BIO *bio)
948 {
949 return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
950 }
951
952 static int dgram_sctp_new(BIO *bi)
953 {
954 bio_dgram_sctp_data *data = NULL;
955
956 bi->init = 0;
957 bi->num = 0;
958 if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL) {
959 BIOerr(BIO_F_DGRAM_SCTP_NEW, ERR_R_MALLOC_FAILURE);
960 return 0;
961 }
962 # ifdef SCTP_PR_SCTP_NONE
963 data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
964 # endif
965 bi->ptr = data;
966
967 bi->flags = 0;
968 return 1;
969 }
970
971 static int dgram_sctp_free(BIO *a)
972 {
973 bio_dgram_sctp_data *data;
974
975 if (a == NULL)
976 return 0;
977 if (!dgram_clear(a))
978 return 0;
979
980 data = (bio_dgram_sctp_data *) a->ptr;
981 if (data != NULL)
982 OPENSSL_free(data);
983
984 return 1;
985 }
986
987 # ifdef SCTP_AUTHENTICATION_EVENT
988 void dgram_sctp_handle_auth_free_key_event(BIO *b,
989 union sctp_notification *snp)
990 {
991 int ret;
992 struct sctp_authkey_event *authkeyevent = &snp->sn_auth_event;
993
994 if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY) {
995 struct sctp_authkeyid authkeyid;
996
997 /* delete key */
998 authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
999 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1000 &authkeyid, sizeof(struct sctp_authkeyid));
1001 }
1002 }
1003 # endif
1004
1005 static int dgram_sctp_read(BIO *b, char *out, int outl)
1006 {
1007 int ret = 0, n = 0, i, optval;
1008 socklen_t optlen;
1009 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1010 union sctp_notification *snp;
1011 struct msghdr msg;
1012 struct iovec iov;
1013 struct cmsghdr *cmsg;
1014 char cmsgbuf[512];
1015
1016 if (out != NULL) {
1017 clear_socket_error();
1018
1019 do {
1020 memset(&data->rcvinfo, 0, sizeof(data->rcvinfo));
1021 iov.iov_base = out;
1022 iov.iov_len = outl;
1023 msg.msg_name = NULL;
1024 msg.msg_namelen = 0;
1025 msg.msg_iov = &iov;
1026 msg.msg_iovlen = 1;
1027 msg.msg_control = cmsgbuf;
1028 msg.msg_controllen = 512;
1029 msg.msg_flags = 0;
1030 n = recvmsg(b->num, &msg, 0);
1031
1032 if (n <= 0) {
1033 if (n < 0)
1034 ret = n;
1035 break;
1036 }
1037
1038 if (msg.msg_controllen > 0) {
1039 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
1040 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
1041 if (cmsg->cmsg_level != IPPROTO_SCTP)
1042 continue;
1043 # ifdef SCTP_RCVINFO
1044 if (cmsg->cmsg_type == SCTP_RCVINFO) {
1045 struct sctp_rcvinfo *rcvinfo;
1046
1047 rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1048 data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1049 data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1050 data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1051 data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1052 data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1053 data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1054 data->rcvinfo.rcv_context = rcvinfo->rcv_context;
1055 }
1056 # endif
1057 # ifdef SCTP_SNDRCV
1058 if (cmsg->cmsg_type == SCTP_SNDRCV) {
1059 struct sctp_sndrcvinfo *sndrcvinfo;
1060
1061 sndrcvinfo =
1062 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1063 data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
1064 data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
1065 data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
1066 data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
1067 data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
1068 data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
1069 data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
1070 }
1071 # endif
1072 }
1073 }
1074
1075 if (msg.msg_flags & MSG_NOTIFICATION) {
1076 snp = (union sctp_notification *)out;
1077 if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
1078 # ifdef SCTP_EVENT
1079 struct sctp_event event;
1080 # else
1081 struct sctp_event_subscribe event;
1082 socklen_t eventsize;
1083 # endif
1084
1085 /* disable sender dry event */
1086 # ifdef SCTP_EVENT
1087 memset(&event, 0, sizeof(event));
1088 event.se_assoc_id = 0;
1089 event.se_type = SCTP_SENDER_DRY_EVENT;
1090 event.se_on = 0;
1091 i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1092 sizeof(struct sctp_event));
1093 if (i < 0) {
1094 ret = i;
1095 break;
1096 }
1097 # else
1098 eventsize = sizeof(struct sctp_event_subscribe);
1099 i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1100 &eventsize);
1101 if (i < 0) {
1102 ret = i;
1103 break;
1104 }
1105
1106 event.sctp_sender_dry_event = 0;
1107
1108 i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1109 sizeof(struct sctp_event_subscribe));
1110 if (i < 0) {
1111 ret = i;
1112 break;
1113 }
1114 # endif
1115 }
1116 # ifdef SCTP_AUTHENTICATION_EVENT
1117 if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1118 dgram_sctp_handle_auth_free_key_event(b, snp);
1119 # endif
1120
1121 if (data->handle_notifications != NULL)
1122 data->handle_notifications(b, data->notification_context,
1123 (void *)out);
1124
1125 memset(out, 0, outl);
1126 } else
1127 ret += n;
1128 }
1129 while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR)
1130 && (ret < outl));
1131
1132 if (ret > 0 && !(msg.msg_flags & MSG_EOR)) {
1133 /* Partial message read, this should never happen! */
1134
1135 /*
1136 * The buffer was too small, this means the peer sent a message
1137 * that was larger than allowed.
1138 */
1139 if (ret == outl)
1140 return -1;
1141
1142 /*
1143 * Test if socket buffer can handle max record size (2^14 + 2048
1144 * + 13)
1145 */
1146 optlen = (socklen_t) sizeof(int);
1147 ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
1148 if (ret >= 0)
1149 OPENSSL_assert(optval >= 18445);
1150
1151 /*
1152 * Test if SCTP doesn't partially deliver below max record size
1153 * (2^14 + 2048 + 13)
1154 */
1155 optlen = (socklen_t) sizeof(int);
1156 ret =
1157 getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
1158 &optval, &optlen);
1159 if (ret >= 0)
1160 OPENSSL_assert(optval >= 18445);
1161
1162 /*
1163 * Partially delivered notification??? Probably a bug....
1164 */
1165 OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
1166
1167 /*
1168 * Everything seems ok till now, so it's most likely a message
1169 * dropped by PR-SCTP.
1170 */
1171 memset(out, 0, outl);
1172 BIO_set_retry_read(b);
1173 return -1;
1174 }
1175
1176 BIO_clear_retry_flags(b);
1177 if (ret < 0) {
1178 if (BIO_dgram_should_retry(ret)) {
1179 BIO_set_retry_read(b);
1180 data->_errno = get_last_socket_error();
1181 }
1182 }
1183
1184 /* Test if peer uses SCTP-AUTH before continuing */
1185 if (!data->peer_auth_tested) {
1186 int ii, auth_data = 0, auth_forward = 0;
1187 unsigned char *p;
1188 struct sctp_authchunks *authchunks;
1189
1190 optlen =
1191 (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1192 authchunks = OPENSSL_malloc(optlen);
1193 if (authchunks == NULL) {
1194 BIOerr(BIO_F_DGRAM_SCTP_READ, ERR_R_MALLOC_FAILURE);
1195 return -1;
1196 }
1197 memset(authchunks, 0, optlen);
1198 ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS,
1199 authchunks, &optlen);
1200
1201 if (ii >= 0)
1202 for (p = (unsigned char *)authchunks->gauth_chunks;
1203 p < (unsigned char *)authchunks + optlen;
1204 p += sizeof(uint8_t)) {
1205 if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
1206 auth_data = 1;
1207 if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
1208 auth_forward = 1;
1209 }
1210
1211 OPENSSL_free(authchunks);
1212
1213 if (!auth_data || !auth_forward) {
1214 BIOerr(BIO_F_DGRAM_SCTP_READ, BIO_R_CONNECT_ERROR);
1215 return -1;
1216 }
1217
1218 data->peer_auth_tested = 1;
1219 }
1220 }
1221 return ret;
1222 }
1223
1224 /*
1225 * dgram_sctp_write - send message on SCTP socket
1226 * @b: BIO to write to
1227 * @in: data to send
1228 * @inl: amount of bytes in @in to send
1229 *
1230 * Returns -1 on error or the sent amount of bytes on success
1231 */
1232 static int dgram_sctp_write(BIO *b, const char *in, int inl)
1233 {
1234 int ret;
1235 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1236 struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
1237 struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
1238 struct bio_dgram_sctp_sndinfo handshake_sinfo;
1239 struct iovec iov[1];
1240 struct msghdr msg;
1241 struct cmsghdr *cmsg;
1242 # if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1243 char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) +
1244 CMSG_SPACE(sizeof(struct sctp_prinfo))];
1245 struct sctp_sndinfo *sndinfo;
1246 struct sctp_prinfo *prinfo;
1247 # else
1248 char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
1249 struct sctp_sndrcvinfo *sndrcvinfo;
1250 # endif
1251
1252 clear_socket_error();
1253
1254 /*
1255 * If we're send anything else than application data, disable all user
1256 * parameters and flags.
1257 */
1258 if (in[0] != 23) {
1259 memset(&handshake_sinfo, 0, sizeof(handshake_sinfo));
1260 # ifdef SCTP_SACK_IMMEDIATELY
1261 handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
1262 # endif
1263 sinfo = &handshake_sinfo;
1264 }
1265
1266 /* We can only send a shutdown alert if the socket is dry */
1267 if (data->save_shutdown) {
1268 ret = BIO_dgram_sctp_wait_for_dry(b);
1269 if (ret < 0)
1270 return -1;
1271 if (ret == 0) {
1272 BIO_clear_retry_flags(b);
1273 BIO_set_retry_write(b);
1274 return -1;
1275 }
1276 }
1277
1278 iov[0].iov_base = (char *)in;
1279 iov[0].iov_len = inl;
1280 msg.msg_name = NULL;
1281 msg.msg_namelen = 0;
1282 msg.msg_iov = iov;
1283 msg.msg_iovlen = 1;
1284 msg.msg_control = (caddr_t) cmsgbuf;
1285 msg.msg_controllen = 0;
1286 msg.msg_flags = 0;
1287 # if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
1288 cmsg = (struct cmsghdr *)cmsgbuf;
1289 cmsg->cmsg_level = IPPROTO_SCTP;
1290 cmsg->cmsg_type = SCTP_SNDINFO;
1291 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
1292 sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
1293 memset(sndinfo, 0, sizeof(*sndinfo));
1294 sndinfo->snd_sid = sinfo->snd_sid;
1295 sndinfo->snd_flags = sinfo->snd_flags;
1296 sndinfo->snd_ppid = sinfo->snd_ppid;
1297 sndinfo->snd_context = sinfo->snd_context;
1298 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
1299
1300 cmsg =
1301 (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
1302 cmsg->cmsg_level = IPPROTO_SCTP;
1303 cmsg->cmsg_type = SCTP_PRINFO;
1304 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
1305 prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
1306 memset(prinfo, 0, sizeof(*prinfo));
1307 prinfo->pr_policy = pinfo->pr_policy;
1308 prinfo->pr_value = pinfo->pr_value;
1309 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
1310 # else
1311 cmsg = (struct cmsghdr *)cmsgbuf;
1312 cmsg->cmsg_level = IPPROTO_SCTP;
1313 cmsg->cmsg_type = SCTP_SNDRCV;
1314 cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
1315 sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
1316 memset(sndrcvinfo, 0, sizeof(*sndrcvinfo));
1317 sndrcvinfo->sinfo_stream = sinfo->snd_sid;
1318 sndrcvinfo->sinfo_flags = sinfo->snd_flags;
1319 # ifdef __FreeBSD__
1320 sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
1321 # endif
1322 sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
1323 sndrcvinfo->sinfo_context = sinfo->snd_context;
1324 sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
1325 msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
1326 # endif
1327
1328 ret = sendmsg(b->num, &msg, 0);
1329
1330 BIO_clear_retry_flags(b);
1331 if (ret <= 0) {
1332 if (BIO_dgram_should_retry(ret)) {
1333 BIO_set_retry_write(b);
1334 data->_errno = get_last_socket_error();
1335 }
1336 }
1337 return ret;
1338 }
1339
1340 static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
1341 {
1342 long ret = 1;
1343 bio_dgram_sctp_data *data = NULL;
1344 socklen_t sockopt_len = 0;
1345 struct sctp_authkeyid authkeyid;
1346 struct sctp_authkey *authkey = NULL;
1347
1348 data = (bio_dgram_sctp_data *) b->ptr;
1349
1350 switch (cmd) {
1351 case BIO_CTRL_DGRAM_QUERY_MTU:
1352 /*
1353 * Set to maximum (2^14) and ignore user input to enable transport
1354 * protocol fragmentation. Returns always 2^14.
1355 */
1356 data->mtu = 16384;
1357 ret = data->mtu;
1358 break;
1359 case BIO_CTRL_DGRAM_SET_MTU:
1360 /*
1361 * Set to maximum (2^14) and ignore input to enable transport
1362 * protocol fragmentation. Returns always 2^14.
1363 */
1364 data->mtu = 16384;
1365 ret = data->mtu;
1366 break;
1367 case BIO_CTRL_DGRAM_SET_CONNECTED:
1368 case BIO_CTRL_DGRAM_CONNECT:
1369 /* Returns always -1. */
1370 ret = -1;
1371 break;
1372 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
1373 /*
1374 * SCTP doesn't need the DTLS timer Returns always 1.
1375 */
1376 break;
1377 case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
1378 /*
1379 * We allow transport protocol fragmentation so this is irrelevant
1380 */
1381 ret = 0;
1382 break;
1383 case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
1384 if (num > 0)
1385 data->in_handshake = 1;
1386 else
1387 data->in_handshake = 0;
1388
1389 ret =
1390 setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY,
1391 &data->in_handshake, sizeof(int));
1392 break;
1393 case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
1394 /*
1395 * New shared key for SCTP AUTH. Returns 0 on success, -1 otherwise.
1396 */
1397
1398 /* Get active key */
1399 sockopt_len = sizeof(struct sctp_authkeyid);
1400 ret =
1401 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
1402 &sockopt_len);
1403 if (ret < 0)
1404 break;
1405
1406 /* Add new key */
1407 sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
1408 authkey = OPENSSL_malloc(sockopt_len);
1409 if (authkey == NULL) {
1410 ret = -1;
1411 break;
1412 }
1413 memset(authkey, 0, sockopt_len);
1414 authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
1415 # ifndef __FreeBSD__
1416 /*
1417 * This field is missing in FreeBSD 8.2 and earlier, and FreeBSD 8.3
1418 * and higher work without it.
1419 */
1420 authkey->sca_keylength = 64;
1421 # endif
1422 memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
1423
1424 ret =
1425 setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey,
1426 sockopt_len);
1427 OPENSSL_free(authkey);
1428 authkey = NULL;
1429 if (ret < 0)
1430 break;
1431
1432 /* Reset active key */
1433 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1434 &authkeyid, sizeof(struct sctp_authkeyid));
1435 if (ret < 0)
1436 break;
1437
1438 break;
1439 case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
1440 /* Returns 0 on success, -1 otherwise. */
1441
1442 /* Get active key */
1443 sockopt_len = sizeof(struct sctp_authkeyid);
1444 ret =
1445 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
1446 &sockopt_len);
1447 if (ret < 0)
1448 break;
1449
1450 /* Set active key */
1451 authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
1452 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1453 &authkeyid, sizeof(struct sctp_authkeyid));
1454 if (ret < 0)
1455 break;
1456
1457 /*
1458 * CCS has been sent, so remember that and fall through to check if
1459 * we need to deactivate an old key
1460 */
1461 data->ccs_sent = 1;
1462 /* fall-through */
1463
1464 case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
1465 /* Returns 0 on success, -1 otherwise. */
1466
1467 /*
1468 * Has this command really been called or is this just a
1469 * fall-through?
1470 */
1471 if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
1472 data->ccs_rcvd = 1;
1473
1474 /*
1475 * CSS has been both, received and sent, so deactivate an old key
1476 */
1477 if (data->ccs_rcvd == 1 && data->ccs_sent == 1) {
1478 /* Get active key */
1479 sockopt_len = sizeof(struct sctp_authkeyid);
1480 ret =
1481 getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
1482 &authkeyid, &sockopt_len);
1483 if (ret < 0)
1484 break;
1485
1486 /*
1487 * Deactivate key or delete second last key if
1488 * SCTP_AUTHENTICATION_EVENT is not available.
1489 */
1490 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1491 # ifdef SCTP_AUTH_DEACTIVATE_KEY
1492 sockopt_len = sizeof(struct sctp_authkeyid);
1493 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
1494 &authkeyid, sockopt_len);
1495 if (ret < 0)
1496 break;
1497 # endif
1498 # ifndef SCTP_AUTHENTICATION_EVENT
1499 if (authkeyid.scact_keynumber > 0) {
1500 authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
1501 ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1502 &authkeyid, sizeof(struct sctp_authkeyid));
1503 if (ret < 0)
1504 break;
1505 }
1506 # endif
1507
1508 data->ccs_rcvd = 0;
1509 data->ccs_sent = 0;
1510 }
1511 break;
1512 case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
1513 /* Returns the size of the copied struct. */
1514 if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
1515 num = sizeof(struct bio_dgram_sctp_sndinfo);
1516
1517 memcpy(ptr, &(data->sndinfo), num);
1518 ret = num;
1519 break;
1520 case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
1521 /* Returns the size of the copied struct. */
1522 if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
1523 num = sizeof(struct bio_dgram_sctp_sndinfo);
1524
1525 memcpy(&(data->sndinfo), ptr, num);
1526 break;
1527 case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
1528 /* Returns the size of the copied struct. */
1529 if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
1530 num = sizeof(struct bio_dgram_sctp_rcvinfo);
1531
1532 memcpy(ptr, &data->rcvinfo, num);
1533
1534 ret = num;
1535 break;
1536 case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
1537 /* Returns the size of the copied struct. */
1538 if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
1539 num = sizeof(struct bio_dgram_sctp_rcvinfo);
1540
1541 memcpy(&(data->rcvinfo), ptr, num);
1542 break;
1543 case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
1544 /* Returns the size of the copied struct. */
1545 if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
1546 num = sizeof(struct bio_dgram_sctp_prinfo);
1547
1548 memcpy(ptr, &(data->prinfo), num);
1549 ret = num;
1550 break;
1551 case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
1552 /* Returns the size of the copied struct. */
1553 if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
1554 num = sizeof(struct bio_dgram_sctp_prinfo);
1555
1556 memcpy(&(data->prinfo), ptr, num);
1557 break;
1558 case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
1559 /* Returns always 1. */
1560 if (num > 0)
1561 data->save_shutdown = 1;
1562 else
1563 data->save_shutdown = 0;
1564 break;
1565
1566 default:
1567 /*
1568 * Pass to default ctrl function to process SCTP unspecific commands
1569 */
1570 ret = dgram_ctrl(b, cmd, num, ptr);
1571 break;
1572 }
1573 return ret;
1574 }
1575
1576 int BIO_dgram_sctp_notification_cb(BIO *b,
1577 void (*handle_notifications) (BIO *bio,
1578 void
1579 *context,
1580 void *buf),
1581 void *context)
1582 {
1583 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1584
1585 if (handle_notifications != NULL) {
1586 data->handle_notifications = handle_notifications;
1587 data->notification_context = context;
1588 } else
1589 return -1;
1590
1591 return 0;
1592 }
1593
1594 /*
1595 * BIO_dgram_sctp_wait_for_dry - Wait for SCTP SENDER_DRY event
1596 * @b: The BIO to check for the dry event
1597 *
1598 * Wait until the peer confirms all packets have been received, and so that
1599 * our kernel doesn't have anything to send anymore. This is only received by
1600 * the peer's kernel, not the application.
1601 *
1602 * Returns:
1603 * -1 on error
1604 * 0 when not dry yet
1605 * 1 when dry
1606 */
1607 int BIO_dgram_sctp_wait_for_dry(BIO *b)
1608 {
1609 int is_dry = 0;
1610 int sockflags = 0;
1611 int n, ret;
1612 union sctp_notification snp;
1613 struct msghdr msg;
1614 struct iovec iov;
1615 # ifdef SCTP_EVENT
1616 struct sctp_event event;
1617 # else
1618 struct sctp_event_subscribe event;
1619 socklen_t eventsize;
1620 # endif
1621 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1622
1623 /* set sender dry event */
1624 # ifdef SCTP_EVENT
1625 memset(&event, 0, sizeof(event));
1626 event.se_assoc_id = 0;
1627 event.se_type = SCTP_SENDER_DRY_EVENT;
1628 event.se_on = 1;
1629 ret =
1630 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1631 sizeof(struct sctp_event));
1632 # else
1633 eventsize = sizeof(struct sctp_event_subscribe);
1634 ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
1635 if (ret < 0)
1636 return -1;
1637
1638 event.sctp_sender_dry_event = 1;
1639
1640 ret =
1641 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1642 sizeof(struct sctp_event_subscribe));
1643 # endif
1644 if (ret < 0)
1645 return -1;
1646
1647 /* peek for notification */
1648 memset(&snp, 0, sizeof(snp));
1649 iov.iov_base = (char *)&snp;
1650 iov.iov_len = sizeof(union sctp_notification);
1651 msg.msg_name = NULL;
1652 msg.msg_namelen = 0;
1653 msg.msg_iov = &iov;
1654 msg.msg_iovlen = 1;
1655 msg.msg_control = NULL;
1656 msg.msg_controllen = 0;
1657 msg.msg_flags = 0;
1658
1659 n = recvmsg(b->num, &msg, MSG_PEEK);
1660 if (n <= 0) {
1661 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1662 && (get_last_socket_error() != EWOULDBLOCK))
1663 return -1;
1664 else
1665 return 0;
1666 }
1667
1668 /* if we find a notification, process it and try again if necessary */
1669 while (msg.msg_flags & MSG_NOTIFICATION) {
1670 memset(&snp, 0, sizeof(snp));
1671 iov.iov_base = (char *)&snp;
1672 iov.iov_len = sizeof(union sctp_notification);
1673 msg.msg_name = NULL;
1674 msg.msg_namelen = 0;
1675 msg.msg_iov = &iov;
1676 msg.msg_iovlen = 1;
1677 msg.msg_control = NULL;
1678 msg.msg_controllen = 0;
1679 msg.msg_flags = 0;
1680
1681 n = recvmsg(b->num, &msg, 0);
1682 if (n <= 0) {
1683 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1684 && (get_last_socket_error() != EWOULDBLOCK))
1685 return -1;
1686 else
1687 return is_dry;
1688 }
1689
1690 if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
1691 is_dry = 1;
1692
1693 /* disable sender dry event */
1694 # ifdef SCTP_EVENT
1695 memset(&event, 0, sizeof(event));
1696 event.se_assoc_id = 0;
1697 event.se_type = SCTP_SENDER_DRY_EVENT;
1698 event.se_on = 0;
1699 ret =
1700 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
1701 sizeof(struct sctp_event));
1702 # else
1703 eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
1704 ret =
1705 getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1706 &eventsize);
1707 if (ret < 0)
1708 return -1;
1709
1710 event.sctp_sender_dry_event = 0;
1711
1712 ret =
1713 setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
1714 sizeof(struct sctp_event_subscribe));
1715 # endif
1716 if (ret < 0)
1717 return -1;
1718 }
1719 # ifdef SCTP_AUTHENTICATION_EVENT
1720 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1721 dgram_sctp_handle_auth_free_key_event(b, &snp);
1722 # endif
1723
1724 if (data->handle_notifications != NULL)
1725 data->handle_notifications(b, data->notification_context,
1726 (void *)&snp);
1727
1728 /* found notification, peek again */
1729 memset(&snp, 0, sizeof(snp));
1730 iov.iov_base = (char *)&snp;
1731 iov.iov_len = sizeof(union sctp_notification);
1732 msg.msg_name = NULL;
1733 msg.msg_namelen = 0;
1734 msg.msg_iov = &iov;
1735 msg.msg_iovlen = 1;
1736 msg.msg_control = NULL;
1737 msg.msg_controllen = 0;
1738 msg.msg_flags = 0;
1739
1740 /* if we have seen the dry already, don't wait */
1741 if (is_dry) {
1742 sockflags = fcntl(b->num, F_GETFL, 0);
1743 fcntl(b->num, F_SETFL, O_NONBLOCK);
1744 }
1745
1746 n = recvmsg(b->num, &msg, MSG_PEEK);
1747
1748 if (is_dry) {
1749 fcntl(b->num, F_SETFL, sockflags);
1750 }
1751
1752 if (n <= 0) {
1753 if ((n < 0) && (get_last_socket_error() != EAGAIN)
1754 && (get_last_socket_error() != EWOULDBLOCK))
1755 return -1;
1756 else
1757 return is_dry;
1758 }
1759 }
1760
1761 /* read anything else */
1762 return is_dry;
1763 }
1764
1765 int BIO_dgram_sctp_msg_waiting(BIO *b)
1766 {
1767 int n, sockflags;
1768 union sctp_notification snp;
1769 struct msghdr msg;
1770 struct iovec iov;
1771 bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1772
1773 /* Check if there are any messages waiting to be read */
1774 do {
1775 memset(&snp, 0, sizeof(snp));
1776 iov.iov_base = (char *)&snp;
1777 iov.iov_len = sizeof(union sctp_notification);
1778 msg.msg_name = NULL;
1779 msg.msg_namelen = 0;
1780 msg.msg_iov = &iov;
1781 msg.msg_iovlen = 1;
1782 msg.msg_control = NULL;
1783 msg.msg_controllen = 0;
1784 msg.msg_flags = 0;
1785
1786 sockflags = fcntl(b->num, F_GETFL, 0);
1787 fcntl(b->num, F_SETFL, O_NONBLOCK);
1788 n = recvmsg(b->num, &msg, MSG_PEEK);
1789 fcntl(b->num, F_SETFL, sockflags);
1790
1791 /* if notification, process and try again */
1792 if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION)) {
1793 # ifdef SCTP_AUTHENTICATION_EVENT
1794 if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
1795 dgram_sctp_handle_auth_free_key_event(b, &snp);
1796 # endif
1797
1798 memset(&snp, 0, sizeof(snp));
1799 iov.iov_base = (char *)&snp;
1800 iov.iov_len = sizeof(union sctp_notification);
1801 msg.msg_name = NULL;
1802 msg.msg_namelen = 0;
1803 msg.msg_iov = &iov;
1804 msg.msg_iovlen = 1;
1805 msg.msg_control = NULL;
1806 msg.msg_controllen = 0;
1807 msg.msg_flags = 0;
1808 n = recvmsg(b->num, &msg, 0);
1809
1810 if (data->handle_notifications != NULL)
1811 data->handle_notifications(b, data->notification_context,
1812 (void *)&snp);
1813 }
1814
1815 } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
1816
1817 /* Return 1 if there is a message to be read, return 0 otherwise. */
1818 if (n > 0)
1819 return 1;
1820 else
1821 return 0;
1822 }
1823
1824 static int dgram_sctp_puts(BIO *bp, const char *str)
1825 {
1826 int n, ret;
1827
1828 n = strlen(str);
1829 ret = dgram_sctp_write(bp, str, n);
1830 return ret;
1831 }
1832 # endif
1833
1834 static int BIO_dgram_should_retry(int i)
1835 {
1836 int err;
1837
1838 if ((i == 0) || (i == -1)) {
1839 err = get_last_socket_error();
1840
1841 # if defined(OPENSSL_SYS_WINDOWS)
1842 /*
1843 * If the socket return value (i) is -1 and err is unexpectedly 0 at
1844 * this point, the error code was overwritten by another system call
1845 * before this error handling is called.
1846 */
1847 # endif
1848
1849 return BIO_dgram_non_fatal_error(err);
1850 }
1851 return 0;
1852 }
1853
1854 int BIO_dgram_non_fatal_error(int err)
1855 {
1856 switch (err) {
1857 # if defined(OPENSSL_SYS_WINDOWS)
1858 # if defined(WSAEWOULDBLOCK)
1859 case WSAEWOULDBLOCK:
1860 # endif
1861 # endif
1862
1863 # ifdef EWOULDBLOCK
1864 # ifdef WSAEWOULDBLOCK
1865 # if WSAEWOULDBLOCK != EWOULDBLOCK
1866 case EWOULDBLOCK:
1867 # endif
1868 # else
1869 case EWOULDBLOCK:
1870 # endif
1871 # endif
1872
1873 # ifdef EINTR
1874 case EINTR:
1875 # endif
1876
1877 # ifdef EAGAIN
1878 # if EWOULDBLOCK != EAGAIN
1879 case EAGAIN:
1880 # endif
1881 # endif
1882
1883 # ifdef EPROTO
1884 case EPROTO:
1885 # endif
1886
1887 # ifdef EINPROGRESS
1888 case EINPROGRESS:
1889 # endif
1890
1891 # ifdef EALREADY
1892 case EALREADY:
1893 # endif
1894
1895 return 1;
1896 default:
1897 break;
1898 }
1899 return 0;
1900 }
1901
1902 static void get_current_time(struct timeval *t)
1903 {
1904 # if defined(_WIN32)
1905 SYSTEMTIME st;
1906 union {
1907 unsigned __int64 ul;
1908 FILETIME ft;
1909 } now;
1910
1911 GetSystemTime(&st);
1912 SystemTimeToFileTime(&st, &now.ft);
1913 # ifdef __MINGW32__
1914 now.ul -= 116444736000000000ULL;
1915 # else
1916 now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
1917 # endif
1918 t->tv_sec = (long)(now.ul / 10000000);
1919 t->tv_usec = ((int)(now.ul % 10000000)) / 10;
1920 # else
1921 gettimeofday(t, NULL);
1922 # endif
1923 }
1924
1925 #endif
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