Coverage Report

Created: 2024-11-21 07:03

/src/openssl/crypto/bio/bss_dgram.c
Line
Count
Source (jump to first uncovered line)
1
/*
2
 * Copyright 2005-2024 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
#ifndef _GNU_SOURCE
11
# define _GNU_SOURCE
12
#endif
13
14
#include <stdio.h>
15
#include <errno.h>
16
17
#include "internal/time.h"
18
#include "bio_local.h"
19
#ifndef OPENSSL_NO_DGRAM
20
21
# ifndef OPENSSL_NO_SCTP
22
#  include <netinet/sctp.h>
23
#  include <fcntl.h>
24
#  define OPENSSL_SCTP_DATA_CHUNK_TYPE            0x00
25
#  define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
26
# endif
27
28
# if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
29
#  define IP_MTU      14        /* linux is lame */
30
# endif
31
32
# if OPENSSL_USE_IPV6 && !defined(IPPROTO_IPV6)
33
#  define IPPROTO_IPV6 41       /* windows is lame */
34
# endif
35
36
# if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
37
/* Standard definition causes type-punning problems. */
38
#  undef IN6_IS_ADDR_V4MAPPED
39
#  define s6_addr32 __u6_addr.__u6_addr32
40
#  define IN6_IS_ADDR_V4MAPPED(a)               \
41
        (((a)->s6_addr32[0] == 0) &&          \
42
         ((a)->s6_addr32[1] == 0) &&          \
43
         ((a)->s6_addr32[2] == htonl(0x0000ffff)))
44
# endif
45
46
/* Determine what method to use for BIO_sendmmsg and BIO_recvmmsg. */
47
# define M_METHOD_NONE       0
48
# define M_METHOD_RECVMMSG   1
49
# define M_METHOD_RECVMSG    2
50
# define M_METHOD_RECVFROM   3
51
# define M_METHOD_WSARECVMSG 4
52
53
# if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
54
#  if !(__GLIBC_PREREQ(2, 14))
55
#   undef NO_RECVMMSG
56
    /*
57
     * Some old glibc versions may have recvmmsg and MSG_WAITFORONE flag, but
58
     * not sendmmsg. We need both so force this to be disabled on these old
59
     * versions
60
     */
61
#   define NO_RECVMMSG
62
#  endif
63
# endif
64
# if defined(__GNU__)
65
   /* GNU/Hurd does not have IP_PKTINFO yet */
66
   #undef NO_RECVMSG
67
   #define NO_RECVMSG
68
# endif
69
# if (defined(__ANDROID_API__) && __ANDROID_API__ < 21) || defined(_AIX)
70
#  undef NO_RECVMMSG
71
#  define NO_RECVMMSG
72
# endif
73
# if !defined(M_METHOD)
74
#  if defined(OPENSSL_SYS_WINDOWS) && defined(BIO_HAVE_WSAMSG) && !defined(NO_WSARECVMSG)
75
#   define M_METHOD  M_METHOD_WSARECVMSG
76
#  elif !defined(OPENSSL_SYS_WINDOWS) && defined(MSG_WAITFORONE) && !defined(NO_RECVMMSG)
77
#   define M_METHOD  M_METHOD_RECVMMSG
78
#  elif !defined(OPENSSL_SYS_WINDOWS) && defined(CMSG_LEN) && !defined(NO_RECVMSG)
79
#   define M_METHOD  M_METHOD_RECVMSG
80
#  elif !defined(NO_RECVFROM)
81
#   define M_METHOD  M_METHOD_RECVFROM
82
#  else
83
#   define M_METHOD  M_METHOD_NONE
84
#  endif
85
# endif
86
87
# if defined(OPENSSL_SYS_WINDOWS)
88
#  define BIO_CMSG_SPACE(x) WSA_CMSG_SPACE(x)
89
#  define BIO_CMSG_FIRSTHDR(x) WSA_CMSG_FIRSTHDR(x)
90
#  define BIO_CMSG_NXTHDR(x, y) WSA_CMSG_NXTHDR(x, y)
91
#  define BIO_CMSG_DATA(x) WSA_CMSG_DATA(x)
92
#  define BIO_CMSG_LEN(x) WSA_CMSG_LEN(x)
93
#  define MSGHDR_TYPE WSAMSG
94
#  define CMSGHDR_TYPE WSACMSGHDR
95
# else
96
#  define MSGHDR_TYPE struct msghdr
97
0
#  define CMSGHDR_TYPE struct cmsghdr
98
0
#  define BIO_CMSG_SPACE(x) CMSG_SPACE(x)
99
0
#  define BIO_CMSG_FIRSTHDR(x) CMSG_FIRSTHDR(x)
100
0
#  define BIO_CMSG_NXTHDR(x, y) CMSG_NXTHDR(x, y)
101
0
#  define BIO_CMSG_DATA(x) CMSG_DATA(x)
102
0
#  define BIO_CMSG_LEN(x) CMSG_LEN(x)
103
# endif
104
105
# if   M_METHOD == M_METHOD_RECVMMSG   \
106
    || M_METHOD == M_METHOD_RECVMSG    \
107
    || M_METHOD == M_METHOD_WSARECVMSG
108
#  if defined(__APPLE__)
109
    /*
110
     * CMSG_SPACE is not a constant expression on OSX even though POSIX
111
     * says it's supposed to be. This should be adequate.
112
     */
113
#   define BIO_CMSG_ALLOC_LEN   64
114
#  else
115
#   if defined(IPV6_PKTINFO)
116
#     define BIO_CMSG_ALLOC_LEN_1   BIO_CMSG_SPACE(sizeof(struct in6_pktinfo))
117
#   else
118
#     define BIO_CMSG_ALLOC_LEN_1   0
119
#   endif
120
#   if defined(IP_PKTINFO)
121
#     define BIO_CMSG_ALLOC_LEN_2   BIO_CMSG_SPACE(sizeof(struct in_pktinfo))
122
#   else
123
#     define BIO_CMSG_ALLOC_LEN_2   0
124
#   endif
125
#   if defined(IP_RECVDSTADDR)
126
#     define BIO_CMSG_ALLOC_LEN_3   BIO_CMSG_SPACE(sizeof(struct in_addr))
127
#   else
128
#     define BIO_CMSG_ALLOC_LEN_3   0
129
#   endif
130
0
#   define BIO_MAX(X,Y) ((X) > (Y) ? (X) : (Y))
131
#   define BIO_CMSG_ALLOC_LEN                                        \
132
0
        BIO_MAX(BIO_CMSG_ALLOC_LEN_1,                                \
133
0
                BIO_MAX(BIO_CMSG_ALLOC_LEN_2, BIO_CMSG_ALLOC_LEN_3))
134
#  endif
135
#  if (defined(IP_PKTINFO) || defined(IP_RECVDSTADDR)) && defined(IPV6_RECVPKTINFO)
136
#   define SUPPORT_LOCAL_ADDR
137
#  endif
138
# endif
139
140
0
# define BIO_MSG_N(array, stride, n) (*(BIO_MSG *)((char *)(array) + (n)*(stride)))
141
142
static int dgram_write(BIO *h, const char *buf, int num);
143
static int dgram_read(BIO *h, char *buf, int size);
144
static int dgram_puts(BIO *h, const char *str);
145
static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
146
static int dgram_new(BIO *h);
147
static int dgram_free(BIO *data);
148
static int dgram_clear(BIO *bio);
149
static int dgram_sendmmsg(BIO *b, BIO_MSG *msg,
150
                          size_t stride, size_t num_msg,
151
                          uint64_t flags, size_t *num_processed);
152
static int dgram_recvmmsg(BIO *b, BIO_MSG *msg,
153
                          size_t stride, size_t num_msg,
154
                          uint64_t flags, size_t *num_processed);
155
156
# ifndef OPENSSL_NO_SCTP
157
static int dgram_sctp_write(BIO *h, const char *buf, int num);
158
static int dgram_sctp_read(BIO *h, char *buf, int size);
159
static int dgram_sctp_puts(BIO *h, const char *str);
160
static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
161
static int dgram_sctp_new(BIO *h);
162
static int dgram_sctp_free(BIO *data);
163
static int dgram_sctp_wait_for_dry(BIO *b);
164
static int dgram_sctp_msg_waiting(BIO *b);
165
#  ifdef SCTP_AUTHENTICATION_EVENT
166
static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification
167
                                                  *snp);
168
#  endif
169
# endif
170
171
static int BIO_dgram_should_retry(int s);
172
173
static const BIO_METHOD methods_dgramp = {
174
    BIO_TYPE_DGRAM,
175
    "datagram socket",
176
    bwrite_conv,
177
    dgram_write,
178
    bread_conv,
179
    dgram_read,
180
    dgram_puts,
181
    NULL,                       /* dgram_gets,         */
182
    dgram_ctrl,
183
    dgram_new,
184
    dgram_free,
185
    NULL,                       /* dgram_callback_ctrl */
186
    dgram_sendmmsg,
187
    dgram_recvmmsg,
188
};
189
190
# ifndef OPENSSL_NO_SCTP
191
static const BIO_METHOD methods_dgramp_sctp = {
192
    BIO_TYPE_DGRAM_SCTP,
193
    "datagram sctp socket",
194
    bwrite_conv,
195
    dgram_sctp_write,
196
    bread_conv,
197
    dgram_sctp_read,
198
    dgram_sctp_puts,
199
    NULL,                       /* dgram_gets,         */
200
    dgram_sctp_ctrl,
201
    dgram_sctp_new,
202
    dgram_sctp_free,
203
    NULL,                       /* dgram_callback_ctrl */
204
    NULL,                       /* sendmmsg */
205
    NULL,                       /* recvmmsg */
206
};
207
# endif
208
209
typedef struct bio_dgram_data_st {
210
    BIO_ADDR peer;
211
    BIO_ADDR local_addr;
212
    unsigned int connected;
213
    unsigned int _errno;
214
    unsigned int mtu;
215
    OSSL_TIME next_timeout;
216
    OSSL_TIME socket_timeout;
217
    unsigned int peekmode;
218
    char local_addr_enabled;
219
} bio_dgram_data;
220
221
# ifndef OPENSSL_NO_SCTP
222
typedef struct bio_dgram_sctp_save_message_st {
223
    BIO *bio;
224
    char *data;
225
    int length;
226
} bio_dgram_sctp_save_message;
227
228
/*
229
 * Note: bio_dgram_data must be first here
230
 * as we use dgram_ctrl for underlying dgram operations
231
 * which will cast this struct to a bio_dgram_data
232
 */
233
typedef struct bio_dgram_sctp_data_st {
234
    bio_dgram_data dgram;
235
    struct bio_dgram_sctp_sndinfo sndinfo;
236
    struct bio_dgram_sctp_rcvinfo rcvinfo;
237
    struct bio_dgram_sctp_prinfo prinfo;
238
    BIO_dgram_sctp_notification_handler_fn handle_notifications;
239
    void *notification_context;
240
    int in_handshake;
241
    int ccs_rcvd;
242
    int ccs_sent;
243
    int save_shutdown;
244
    int peer_auth_tested;
245
} bio_dgram_sctp_data;
246
# endif
247
248
const BIO_METHOD *BIO_s_datagram(void)
249
0
{
250
0
    return &methods_dgramp;
251
0
}
252
253
BIO *BIO_new_dgram(int fd, int close_flag)
254
0
{
255
0
    BIO *ret;
256
257
0
    ret = BIO_new(BIO_s_datagram());
258
0
    if (ret == NULL)
259
0
        return NULL;
260
0
    BIO_set_fd(ret, fd, close_flag);
261
0
    return ret;
262
0
}
263
264
static int dgram_new(BIO *bi)
265
0
{
266
0
    bio_dgram_data *data = OPENSSL_zalloc(sizeof(*data));
267
268
0
    if (data == NULL)
269
0
        return 0;
270
0
    bi->ptr = data;
271
0
    return 1;
272
0
}
273
274
static int dgram_free(BIO *a)
275
0
{
276
0
    bio_dgram_data *data;
277
278
0
    if (a == NULL)
279
0
        return 0;
280
0
    if (!dgram_clear(a))
281
0
        return 0;
282
283
0
    data = (bio_dgram_data *)a->ptr;
284
0
    OPENSSL_free(data);
285
286
0
    return 1;
287
0
}
288
289
static int dgram_clear(BIO *a)
290
0
{
291
0
    if (a == NULL)
292
0
        return 0;
293
0
    if (a->shutdown) {
294
0
        if (a->init) {
295
0
            BIO_closesocket(a->num);
296
0
        }
297
0
        a->init = 0;
298
0
        a->flags = 0;
299
0
    }
300
0
    return 1;
301
0
}
302
303
static void dgram_adjust_rcv_timeout(BIO *b)
304
0
{
305
0
# if defined(SO_RCVTIMEO)
306
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
307
0
    OSSL_TIME timeleft;
308
309
    /* Is a timer active? */
310
0
    if (!ossl_time_is_zero(data->next_timeout)) {
311
        /* Read current socket timeout */
312
#  ifdef OPENSSL_SYS_WINDOWS
313
        int timeout;
314
        int sz = sizeof(timeout);
315
316
        if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
317
                       (void *)&timeout, &sz) < 0)
318
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
319
                           "calling getsockopt()");
320
        else
321
            data->socket_timeout = ossl_ms2time(timeout);
322
#  else
323
0
        struct timeval tv;
324
0
        socklen_t sz = sizeof(tv);
325
326
0
        if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &tv, &sz) < 0)
327
0
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
328
0
                           "calling getsockopt()");
329
0
        else
330
0
            data->socket_timeout = ossl_time_from_timeval(tv);
331
0
#  endif
332
333
        /* Calculate time left until timer expires */
334
0
        timeleft = ossl_time_subtract(data->next_timeout, ossl_time_now());
335
0
        if (ossl_time_compare(timeleft, ossl_ticks2time(OSSL_TIME_US)) < 0)
336
0
            timeleft = ossl_ticks2time(OSSL_TIME_US);
337
338
        /*
339
         * Adjust socket timeout if next handshake message timer will expire
340
         * earlier.
341
         */
342
0
        if (ossl_time_is_zero(data->socket_timeout)
343
0
            || ossl_time_compare(data->socket_timeout, timeleft) >= 0) {
344
#  ifdef OPENSSL_SYS_WINDOWS
345
            timeout = (int)ossl_time2ms(timeleft);
346
            if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
347
                           (void *)&timeout, sizeof(timeout)) < 0)
348
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
349
                               "calling setsockopt()");
350
#  else
351
0
            tv = ossl_time_to_timeval(timeleft);
352
0
            if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &tv,
353
0
                           sizeof(tv)) < 0)
354
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
355
0
                               "calling setsockopt()");
356
0
#  endif
357
0
        }
358
0
    }
359
0
# endif
360
0
}
361
362
static void dgram_update_local_addr(BIO *b)
363
0
{
364
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
365
0
    socklen_t addr_len = sizeof(data->local_addr);
366
367
0
    if (getsockname(b->num, &data->local_addr.sa, &addr_len) < 0)
368
        /*
369
         * This should not be possible, but zero-initialize and return
370
         * anyway.
371
         */
372
0
        BIO_ADDR_clear(&data->local_addr);
373
0
}
374
375
# if M_METHOD == M_METHOD_RECVMMSG || M_METHOD == M_METHOD_RECVMSG || M_METHOD == M_METHOD_WSARECVMSG
376
static int dgram_get_sock_family(BIO *b)
377
0
{
378
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
379
0
    return data->local_addr.sa.sa_family;
380
0
}
381
# endif
382
383
static void dgram_reset_rcv_timeout(BIO *b)
384
0
{
385
0
# if defined(SO_RCVTIMEO)
386
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
387
388
    /* Is a timer active? */
389
0
    if (!ossl_time_is_zero(data->next_timeout)) {
390
#  ifdef OPENSSL_SYS_WINDOWS
391
        int timeout = (int)ossl_time2ms(data->socket_timeout);
392
393
        if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
394
                       (void *)&timeout, sizeof(timeout)) < 0)
395
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
396
                           "calling setsockopt()");
397
#  else
398
0
        struct timeval tv = ossl_time_to_timeval(data->socket_timeout);
399
400
0
        if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0)
401
0
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
402
0
                           "calling setsockopt()");
403
0
#  endif
404
0
    }
405
0
# endif
406
0
}
407
408
static int dgram_read(BIO *b, char *out, int outl)
409
0
{
410
0
    int ret = 0;
411
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
412
0
    int flags = 0;
413
414
0
    BIO_ADDR peer;
415
0
    socklen_t len = sizeof(peer);
416
417
0
    if (out != NULL) {
418
0
        clear_socket_error();
419
0
        BIO_ADDR_clear(&peer);
420
0
        dgram_adjust_rcv_timeout(b);
421
0
        if (data->peekmode)
422
0
            flags = MSG_PEEK;
423
0
        ret = recvfrom(b->num, out, outl, flags,
424
0
                       BIO_ADDR_sockaddr_noconst(&peer), &len);
425
426
0
        if (!data->connected && ret >= 0)
427
0
            BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &peer);
428
429
0
        BIO_clear_retry_flags(b);
430
0
        if (ret < 0) {
431
0
            if (BIO_dgram_should_retry(ret)) {
432
0
                BIO_set_retry_read(b);
433
0
                data->_errno = get_last_socket_error();
434
0
            }
435
0
        }
436
437
0
        dgram_reset_rcv_timeout(b);
438
0
    }
439
0
    return ret;
440
0
}
441
442
static int dgram_write(BIO *b, const char *in, int inl)
443
0
{
444
0
    int ret;
445
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
446
0
    clear_socket_error();
447
448
0
    if (data->connected)
449
0
        ret = writesocket(b->num, in, inl);
450
0
    else {
451
0
        int peerlen = BIO_ADDR_sockaddr_size(&data->peer);
452
453
0
        ret = sendto(b->num, in, inl, 0,
454
0
                     BIO_ADDR_sockaddr(&data->peer), peerlen);
455
0
    }
456
457
0
    BIO_clear_retry_flags(b);
458
0
    if (ret <= 0) {
459
0
        if (BIO_dgram_should_retry(ret)) {
460
0
            BIO_set_retry_write(b);
461
0
            data->_errno = get_last_socket_error();
462
0
        }
463
0
    }
464
0
    return ret;
465
0
}
466
467
static long dgram_get_mtu_overhead(bio_dgram_data *data)
468
0
{
469
0
    long ret;
470
471
0
    switch (BIO_ADDR_family(&data->peer)) {
472
0
    case AF_INET:
473
        /*
474
         * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
475
         */
476
0
        ret = 28;
477
0
        break;
478
0
# if OPENSSL_USE_IPV6
479
0
    case AF_INET6:
480
0
        {
481
0
#  ifdef IN6_IS_ADDR_V4MAPPED
482
0
            struct in6_addr tmp_addr;
483
0
            if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
484
0
                && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
485
                /*
486
                 * Assume this is UDP - 20 bytes for IP, 8 bytes for UDP
487
                 */
488
0
                ret = 28;
489
0
            else
490
0
#  endif
491
            /*
492
             * Assume this is UDP - 40 bytes for IP, 8 bytes for UDP
493
             */
494
0
            ret = 48;
495
0
        }
496
0
        break;
497
0
# endif
498
0
    default:
499
        /* We don't know. Go with the historical default */
500
0
        ret = 28;
501
0
        break;
502
0
    }
503
0
    return ret;
504
0
}
505
506
/* Enables appropriate destination address reception option on the socket. */
507
# if defined(SUPPORT_LOCAL_ADDR)
508
0
static int enable_local_addr(BIO *b, int enable) {
509
0
    int af = dgram_get_sock_family(b);
510
511
0
    if (af == AF_INET) {
512
0
#  if defined(IP_PKTINFO)
513
        /* IP_PKTINFO is preferred */
514
0
        if (setsockopt(b->num, IPPROTO_IP, IP_PKTINFO,
515
0
                       (void *)&enable, sizeof(enable)) < 0)
516
0
            return 0;
517
518
0
        return 1;
519
520
#  elif defined(IP_RECVDSTADDR)
521
        /* Fall back to IP_RECVDSTADDR */
522
523
        if (setsockopt(b->num, IPPROTO_IP, IP_RECVDSTADDR,
524
                       &enable, sizeof(enable)) < 0)
525
            return 0;
526
527
        return 1;
528
#  endif
529
0
    }
530
531
0
#  if OPENSSL_USE_IPV6
532
0
    if (af == AF_INET6) {
533
0
#   if defined(IPV6_RECVPKTINFO)
534
0
        if (setsockopt(b->num, IPPROTO_IPV6, IPV6_RECVPKTINFO,
535
0
                       &enable, sizeof(enable)) < 0)
536
0
            return 0;
537
538
0
        return 1;
539
0
#   endif
540
0
    }
541
0
#  endif
542
543
0
    return 0;
544
0
}
545
# endif
546
547
static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
548
0
{
549
0
    long ret = 1;
550
0
    int *ip;
551
0
    bio_dgram_data *data = NULL;
552
0
# ifndef __DJGPP__
553
    /* There are currently no cases where this is used on djgpp/watt32. */
554
0
    int sockopt_val = 0;
555
0
# endif
556
0
    int d_errno;
557
0
# if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
558
0
    socklen_t sockopt_len;      /* assume that system supporting IP_MTU is
559
                                 * modern enough to define socklen_t */
560
0
    socklen_t addr_len;
561
0
    BIO_ADDR addr;
562
0
# endif
563
0
    struct sockaddr_storage ss;
564
0
    socklen_t ss_len = sizeof(ss);
565
566
0
    data = (bio_dgram_data *)b->ptr;
567
568
0
    switch (cmd) {
569
0
    case BIO_CTRL_RESET:
570
0
        num = 0;
571
0
        ret = 0;
572
0
        break;
573
0
    case BIO_CTRL_INFO:
574
0
        ret = 0;
575
0
        break;
576
0
    case BIO_C_SET_FD:
577
0
        dgram_clear(b);
578
0
        b->num = *((int *)ptr);
579
0
        b->shutdown = (int)num;
580
0
        b->init = 1;
581
0
        dgram_update_local_addr(b);
582
0
        if (getpeername(b->num, (struct sockaddr *)&ss, &ss_len) == 0) {
583
0
            BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)&ss));
584
0
            data->connected = 1;
585
0
        }
586
0
# if defined(SUPPORT_LOCAL_ADDR)
587
0
        if (data->local_addr_enabled) {
588
0
            if (enable_local_addr(b, 1) < 1)
589
0
                data->local_addr_enabled = 0;
590
0
        }
591
0
# endif
592
0
        break;
593
0
    case BIO_C_GET_FD:
594
0
        if (b->init) {
595
0
            ip = (int *)ptr;
596
0
            if (ip != NULL)
597
0
                *ip = b->num;
598
0
            ret = b->num;
599
0
        } else
600
0
            ret = -1;
601
0
        break;
602
0
    case BIO_CTRL_GET_CLOSE:
603
0
        ret = b->shutdown;
604
0
        break;
605
0
    case BIO_CTRL_SET_CLOSE:
606
0
        b->shutdown = (int)num;
607
0
        break;
608
0
    case BIO_CTRL_PENDING:
609
0
    case BIO_CTRL_WPENDING:
610
0
        ret = 0;
611
0
        break;
612
0
    case BIO_CTRL_DUP:
613
0
    case BIO_CTRL_FLUSH:
614
0
        ret = 1;
615
0
        break;
616
0
    case BIO_CTRL_DGRAM_CONNECT:
617
0
        BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
618
0
        break;
619
        /* (Linux)kernel sets DF bit on outgoing IP packets */
620
0
    case BIO_CTRL_DGRAM_MTU_DISCOVER:
621
0
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
622
0
        addr_len = (socklen_t) sizeof(addr);
623
0
        BIO_ADDR_clear(&addr);
624
0
        if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
625
0
            ret = 0;
626
0
            break;
627
0
        }
628
0
        switch (addr.sa.sa_family) {
629
0
        case AF_INET:
630
0
            sockopt_val = IP_PMTUDISC_DO;
631
0
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
632
0
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
633
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
634
0
                               "calling setsockopt()");
635
0
            break;
636
0
#  if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
637
0
        case AF_INET6:
638
0
            sockopt_val = IPV6_PMTUDISC_DO;
639
0
            if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
640
0
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
641
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
642
0
                               "calling setsockopt()");
643
0
            break;
644
0
#  endif
645
0
        default:
646
0
            ret = -1;
647
0
            break;
648
0
        }
649
# else
650
        ret = -1;
651
# endif
652
0
        break;
653
0
    case BIO_CTRL_DGRAM_QUERY_MTU:
654
0
# if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
655
0
        addr_len = (socklen_t) sizeof(addr);
656
0
        BIO_ADDR_clear(&addr);
657
0
        if (getsockname(b->num, &addr.sa, &addr_len) < 0) {
658
0
            ret = 0;
659
0
            break;
660
0
        }
661
0
        sockopt_len = sizeof(sockopt_val);
662
0
        switch (addr.sa.sa_family) {
663
0
        case AF_INET:
664
0
            if ((ret =
665
0
                 getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
666
0
                            &sockopt_len)) < 0 || sockopt_val < 0) {
667
0
                ret = 0;
668
0
            } else {
669
                /*
670
                 * we assume that the transport protocol is UDP and no IP
671
                 * options are used.
672
                 */
673
0
                data->mtu = sockopt_val - 8 - 20;
674
0
                ret = data->mtu;
675
0
            }
676
0
            break;
677
0
#  if OPENSSL_USE_IPV6 && defined(IPV6_MTU)
678
0
        case AF_INET6:
679
0
            if ((ret =
680
0
                 getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU,
681
0
                            (void *)&sockopt_val, &sockopt_len)) < 0
682
0
                || sockopt_val < 0) {
683
0
                ret = 0;
684
0
            } else {
685
                /*
686
                 * we assume that the transport protocol is UDP and no IPV6
687
                 * options are used.
688
                 */
689
0
                data->mtu = sockopt_val - 8 - 40;
690
0
                ret = data->mtu;
691
0
            }
692
0
            break;
693
0
#  endif
694
0
        default:
695
0
            ret = 0;
696
0
            break;
697
0
        }
698
# else
699
        ret = 0;
700
# endif
701
0
        break;
702
0
    case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
703
0
        ret = -dgram_get_mtu_overhead(data);
704
0
        switch (BIO_ADDR_family(&data->peer)) {
705
0
        case AF_INET:
706
0
            ret += 576;
707
0
            break;
708
0
# if OPENSSL_USE_IPV6
709
0
        case AF_INET6:
710
0
            {
711
0
#  ifdef IN6_IS_ADDR_V4MAPPED
712
0
                struct in6_addr tmp_addr;
713
0
                if (BIO_ADDR_rawaddress(&data->peer, &tmp_addr, NULL)
714
0
                    && IN6_IS_ADDR_V4MAPPED(&tmp_addr))
715
0
                    ret += 576;
716
0
                else
717
0
#  endif
718
0
                    ret += 1280;
719
0
            }
720
0
            break;
721
0
# endif
722
0
        default:
723
0
            ret += 576;
724
0
            break;
725
0
        }
726
0
        break;
727
0
    case BIO_CTRL_DGRAM_GET_MTU:
728
0
        return data->mtu;
729
0
    case BIO_CTRL_DGRAM_SET_MTU:
730
0
        data->mtu = num;
731
0
        ret = num;
732
0
        break;
733
0
    case BIO_CTRL_DGRAM_SET_CONNECTED:
734
0
        if (ptr != NULL) {
735
0
            data->connected = 1;
736
0
            BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
737
0
        } else {
738
0
            data->connected = 0;
739
0
            BIO_ADDR_clear(&data->peer);
740
0
        }
741
0
        break;
742
0
    case BIO_CTRL_DGRAM_GET_PEER:
743
0
        ret = BIO_ADDR_sockaddr_size(&data->peer);
744
        /* FIXME: if num < ret, we will only return part of an address.
745
           That should bee an error, no? */
746
0
        if (num == 0 || num > ret)
747
0
            num = ret;
748
0
        memcpy(ptr, &data->peer, (ret = num));
749
0
        break;
750
0
    case BIO_CTRL_DGRAM_SET_PEER:
751
0
        BIO_ADDR_make(&data->peer, BIO_ADDR_sockaddr((BIO_ADDR *)ptr));
752
0
        break;
753
0
    case BIO_CTRL_DGRAM_DETECT_PEER_ADDR:
754
0
        {
755
0
            BIO_ADDR xaddr, *p = &data->peer;
756
0
            socklen_t xaddr_len = sizeof(xaddr.sa);
757
758
0
            if (BIO_ADDR_family(p) == AF_UNSPEC) {
759
0
                if (getpeername(b->num, (void *)&xaddr.sa, &xaddr_len) == 0
760
0
                    && BIO_ADDR_family(&xaddr) != AF_UNSPEC) {
761
0
                    p = &xaddr;
762
0
                } else {
763
0
                    ret = 0;
764
0
                    break;
765
0
                }
766
0
            }
767
768
0
            ret = BIO_ADDR_sockaddr_size(p);
769
0
            if (num == 0 || num > ret)
770
0
                num = ret;
771
772
0
            memcpy(ptr, p, (ret = num));
773
0
        }
774
0
        break;
775
0
    case BIO_C_SET_NBIO:
776
0
        if (!BIO_socket_nbio(b->num, num != 0))
777
0
            ret = 0;
778
0
        break;
779
0
    case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
780
0
        data->next_timeout = ossl_time_from_timeval(*(struct timeval *)ptr);
781
0
        break;
782
0
# if defined(SO_RCVTIMEO)
783
0
    case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
784
#  ifdef OPENSSL_SYS_WINDOWS
785
        {
786
            struct timeval *tv = (struct timeval *)ptr;
787
            int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
788
789
            if ((ret = setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
790
                                  (void *)&timeout, sizeof(timeout))) < 0)
791
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
792
                               "calling setsockopt()");
793
        }
794
#  else
795
0
        if ((ret = setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
796
0
                              sizeof(struct timeval))) < 0)
797
0
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
798
0
                           "calling setsockopt()");
799
0
#  endif
800
0
        break;
801
0
    case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
802
0
        {
803
#  ifdef OPENSSL_SYS_WINDOWS
804
            int sz = 0;
805
            int timeout;
806
            struct timeval *tv = (struct timeval *)ptr;
807
808
            sz = sizeof(timeout);
809
            if ((ret = getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
810
                                  (void *)&timeout, &sz)) < 0) {
811
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
812
                               "calling getsockopt()");
813
            } else {
814
                tv->tv_sec = timeout / 1000;
815
                tv->tv_usec = (timeout % 1000) * 1000;
816
                ret = sizeof(*tv);
817
            }
818
#  else
819
0
            socklen_t sz = sizeof(struct timeval);
820
0
            if ((ret = getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
821
0
                                  ptr, &sz)) < 0) {
822
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
823
0
                               "calling getsockopt()");
824
0
            } else {
825
0
                OPENSSL_assert((size_t)sz <= sizeof(struct timeval));
826
0
                ret = (int)sz;
827
0
            }
828
0
#  endif
829
0
        }
830
0
        break;
831
0
# endif
832
0
# if defined(SO_SNDTIMEO)
833
0
    case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
834
#  ifdef OPENSSL_SYS_WINDOWS
835
        {
836
            struct timeval *tv = (struct timeval *)ptr;
837
            int timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
838
839
            if ((ret = setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
840
                                  (void *)&timeout, sizeof(timeout))) < 0)
841
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
842
                               "calling setsockopt()");
843
        }
844
#  else
845
0
        if ((ret = setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
846
0
                              sizeof(struct timeval))) < 0)
847
0
            ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
848
0
                           "calling setsockopt()");
849
0
#  endif
850
0
        break;
851
0
    case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
852
0
        {
853
#  ifdef OPENSSL_SYS_WINDOWS
854
            int sz = 0;
855
            int timeout;
856
            struct timeval *tv = (struct timeval *)ptr;
857
858
            sz = sizeof(timeout);
859
            if ((ret = getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
860
                                  (void *)&timeout, &sz)) < 0) {
861
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
862
                               "calling getsockopt()");
863
            } else {
864
                tv->tv_sec = timeout / 1000;
865
                tv->tv_usec = (timeout % 1000) * 1000;
866
                ret = sizeof(*tv);
867
            }
868
#  else
869
0
            socklen_t sz = sizeof(struct timeval);
870
871
0
            if ((ret = getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
872
0
                                  ptr, &sz)) < 0) {
873
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
874
0
                               "calling getsockopt()");
875
0
            } else {
876
0
                OPENSSL_assert((size_t)sz <= sizeof(struct timeval));
877
0
                ret = (int)sz;
878
0
            }
879
0
#  endif
880
0
        }
881
0
        break;
882
0
# endif
883
0
    case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
884
        /* fall-through */
885
0
    case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
886
# ifdef OPENSSL_SYS_WINDOWS
887
        d_errno = (data->_errno == WSAETIMEDOUT);
888
# else
889
0
        d_errno = (data->_errno == EAGAIN);
890
0
# endif
891
0
        if (d_errno) {
892
0
            ret = 1;
893
0
            data->_errno = 0;
894
0
        } else
895
0
            ret = 0;
896
0
        break;
897
0
# ifdef EMSGSIZE
898
0
    case BIO_CTRL_DGRAM_MTU_EXCEEDED:
899
0
        if (data->_errno == EMSGSIZE) {
900
0
            ret = 1;
901
0
            data->_errno = 0;
902
0
        } else
903
0
            ret = 0;
904
0
        break;
905
0
# endif
906
0
    case BIO_CTRL_DGRAM_SET_DONT_FRAG:
907
0
        switch (data->peer.sa.sa_family) {
908
0
        case AF_INET:
909
# if defined(IP_DONTFRAG)
910
            sockopt_val = num ? 1 : 0;
911
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAG,
912
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
913
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
914
                               "calling setsockopt()");
915
# elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined (IP_PMTUDISC_PROBE)
916
0
            sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT;
917
0
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
918
0
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
919
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
920
0
                               "calling setsockopt()");
921
# elif defined(OPENSSL_SYS_WINDOWS) && defined(IP_DONTFRAGMENT)
922
            sockopt_val = num ? 1 : 0;
923
            if ((ret = setsockopt(b->num, IPPROTO_IP, IP_DONTFRAGMENT,
924
                                  (const char *)&sockopt_val,
925
                                  sizeof(sockopt_val))) < 0)
926
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
927
                               "calling setsockopt()");
928
# else
929
            ret = -1;
930
# endif
931
0
            break;
932
0
# if OPENSSL_USE_IPV6
933
0
        case AF_INET6:
934
0
#  if defined(IPV6_DONTFRAG)
935
0
            sockopt_val = num ? 1 : 0;
936
0
            if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_DONTFRAG,
937
0
                                  (const void *)&sockopt_val,
938
0
                                  sizeof(sockopt_val))) < 0)
939
0
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
940
0
                               "calling setsockopt()");
941
942
#  elif defined(OPENSSL_SYS_LINUX) && defined(IPV6_MTUDISCOVER)
943
            sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT;
944
            if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
945
                                  &sockopt_val, sizeof(sockopt_val))) < 0)
946
                ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
947
                               "calling setsockopt()");
948
#  else
949
            ret = -1;
950
#  endif
951
0
            break;
952
0
# endif
953
0
        default:
954
0
            ret = -1;
955
0
            break;
956
0
        }
957
0
        break;
958
0
    case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
959
0
        ret = dgram_get_mtu_overhead(data);
960
0
        break;
961
962
    /*
963
     * BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE is used here for compatibility
964
     * reasons. When BIO_CTRL_DGRAM_SET_PEEK_MODE was first defined its value
965
     * was incorrectly clashing with BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE. The
966
     * value has been updated to a non-clashing value. However to preserve
967
     * binary compatibility we now respond to both the old value and the new one
968
     */
969
0
    case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
970
0
    case BIO_CTRL_DGRAM_SET_PEEK_MODE:
971
0
        data->peekmode = (unsigned int)num;
972
0
        break;
973
974
0
    case BIO_CTRL_DGRAM_GET_LOCAL_ADDR_CAP:
975
0
# if defined(SUPPORT_LOCAL_ADDR)
976
0
        ret = 1;
977
# else
978
        ret = 0;
979
# endif
980
0
        break;
981
982
0
    case BIO_CTRL_DGRAM_SET_LOCAL_ADDR_ENABLE:
983
0
# if defined(SUPPORT_LOCAL_ADDR)
984
0
        num = num > 0;
985
0
        if (num != data->local_addr_enabled) {
986
0
            if (enable_local_addr(b, num) < 1) {
987
0
                ret = 0;
988
0
                break;
989
0
            }
990
991
0
            data->local_addr_enabled = (char)num;
992
0
        }
993
# else
994
        ret = 0;
995
# endif
996
0
        break;
997
998
0
    case BIO_CTRL_DGRAM_GET_LOCAL_ADDR_ENABLE:
999
0
        *(int *)ptr = data->local_addr_enabled;
1000
0
        break;
1001
1002
0
    case BIO_CTRL_DGRAM_GET_EFFECTIVE_CAPS:
1003
0
        ret = (long)(BIO_DGRAM_CAP_HANDLES_DST_ADDR
1004
0
                     | BIO_DGRAM_CAP_HANDLES_SRC_ADDR
1005
0
                     | BIO_DGRAM_CAP_PROVIDES_DST_ADDR
1006
0
                     | BIO_DGRAM_CAP_PROVIDES_SRC_ADDR);
1007
0
        break;
1008
1009
0
    case BIO_CTRL_GET_RPOLL_DESCRIPTOR:
1010
0
    case BIO_CTRL_GET_WPOLL_DESCRIPTOR:
1011
0
        {
1012
0
            BIO_POLL_DESCRIPTOR *pd = ptr;
1013
1014
0
            pd->type        = BIO_POLL_DESCRIPTOR_TYPE_SOCK_FD;
1015
0
            pd->value.fd    = b->num;
1016
0
        }
1017
0
        break;
1018
1019
0
    default:
1020
0
        ret = 0;
1021
0
        break;
1022
0
    }
1023
    /* Normalize if error */
1024
0
    if (ret < 0)
1025
0
        ret = -1;
1026
0
    return ret;
1027
0
}
1028
1029
static int dgram_puts(BIO *bp, const char *str)
1030
0
{
1031
0
    int n, ret;
1032
1033
0
    n = strlen(str);
1034
0
    ret = dgram_write(bp, str, n);
1035
0
    return ret;
1036
0
}
1037
1038
# if M_METHOD == M_METHOD_WSARECVMSG
1039
static void translate_msg_win(BIO *b, WSAMSG *mh, WSABUF *iov,
1040
                              unsigned char *control, BIO_MSG *msg)
1041
{
1042
    iov->len = msg->data_len;
1043
    iov->buf = msg->data;
1044
1045
    /* Windows requires namelen to be set exactly */
1046
    mh->name = msg->peer != NULL ? &msg->peer->sa : NULL;
1047
    if (msg->peer != NULL && dgram_get_sock_family(b) == AF_INET)
1048
        mh->namelen = sizeof(struct sockaddr_in);
1049
#  if OPENSSL_USE_IPV6
1050
    else if (msg->peer != NULL && dgram_get_sock_family(b) == AF_INET6)
1051
        mh->namelen = sizeof(struct sockaddr_in6);
1052
#  endif
1053
    else
1054
        mh->namelen = 0;
1055
1056
    /*
1057
     * When local address reception (IP_PKTINFO, etc.) is enabled, on Windows
1058
     * this causes WSARecvMsg to fail if the control buffer is too small to hold
1059
     * the structure, or if no control buffer is passed. So we need to give it
1060
     * the control buffer even if we aren't actually going to examine the
1061
     * result.
1062
     */
1063
    mh->lpBuffers       = iov;
1064
    mh->dwBufferCount   = 1;
1065
    mh->Control.len     = BIO_CMSG_ALLOC_LEN;
1066
    mh->Control.buf     = control;
1067
    mh->dwFlags         = 0;
1068
}
1069
# endif
1070
1071
# if M_METHOD == M_METHOD_RECVMMSG || M_METHOD == M_METHOD_RECVMSG
1072
/* Translates a BIO_MSG to a msghdr and iovec. */
1073
static void translate_msg(BIO *b, struct msghdr *mh, struct iovec *iov,
1074
                          unsigned char *control, BIO_MSG *msg)
1075
0
{
1076
0
    bio_dgram_data *data;
1077
1078
0
    iov->iov_base = msg->data;
1079
0
    iov->iov_len  = msg->data_len;
1080
1081
0
    data = (bio_dgram_data *)b->ptr;
1082
0
    if (data->connected == 0) {
1083
        /* macOS requires msg_namelen be 0 if msg_name is NULL */
1084
0
        mh->msg_name = msg->peer != NULL ? &msg->peer->sa : NULL;
1085
0
        if (msg->peer != NULL && dgram_get_sock_family(b) == AF_INET)
1086
0
            mh->msg_namelen = sizeof(struct sockaddr_in);
1087
0
#  if OPENSSL_USE_IPV6
1088
0
        else if (msg->peer != NULL && dgram_get_sock_family(b) == AF_INET6)
1089
0
            mh->msg_namelen = sizeof(struct sockaddr_in6);
1090
0
#  endif
1091
0
        else
1092
0
            mh->msg_namelen = 0;
1093
0
    } else {
1094
0
        mh->msg_name = NULL;
1095
0
        mh->msg_namelen = 0;
1096
0
    }
1097
1098
0
    mh->msg_iov         = iov;
1099
0
    mh->msg_iovlen      = 1;
1100
0
    mh->msg_control     = msg->local != NULL ? control : NULL;
1101
0
    mh->msg_controllen  = msg->local != NULL ? BIO_CMSG_ALLOC_LEN : 0;
1102
0
    mh->msg_flags       = 0;
1103
0
}
1104
# endif
1105
1106
# if M_METHOD == M_METHOD_RECVMMSG || M_METHOD == M_METHOD_RECVMSG || M_METHOD == M_METHOD_WSARECVMSG
1107
/* Extracts destination address from the control buffer. */
1108
0
static int extract_local(BIO *b, MSGHDR_TYPE *mh, BIO_ADDR *local) {
1109
0
#  if defined(IP_PKTINFO) || defined(IP_RECVDSTADDR) || defined(IPV6_PKTINFO)
1110
0
    CMSGHDR_TYPE *cmsg;
1111
0
    int af = dgram_get_sock_family(b);
1112
1113
0
    for (cmsg = BIO_CMSG_FIRSTHDR(mh); cmsg != NULL;
1114
0
         cmsg = BIO_CMSG_NXTHDR(mh, cmsg)) {
1115
0
        if (af == AF_INET) {
1116
0
            if (cmsg->cmsg_level != IPPROTO_IP)
1117
0
                continue;
1118
1119
0
#   if defined(IP_PKTINFO)
1120
0
            if (cmsg->cmsg_type != IP_PKTINFO)
1121
0
                continue;
1122
1123
0
            local->s_in.sin_addr =
1124
0
                ((struct in_pktinfo *)BIO_CMSG_DATA(cmsg))->ipi_addr;
1125
1126
#   elif defined(IP_RECVDSTADDR)
1127
            if (cmsg->cmsg_type != IP_RECVDSTADDR)
1128
                continue;
1129
1130
            local->s_in.sin_addr = *(struct in_addr *)BIO_CMSG_DATA(cmsg);
1131
#   endif
1132
1133
0
#   if defined(IP_PKTINFO) || defined(IP_RECVDSTADDR)
1134
0
            {
1135
0
                bio_dgram_data *data = b->ptr;
1136
1137
0
                local->s_in.sin_family = AF_INET;
1138
0
                local->s_in.sin_port   = data->local_addr.s_in.sin_port;
1139
0
            }
1140
0
            return 1;
1141
0
#   endif
1142
0
        }
1143
0
#   if OPENSSL_USE_IPV6
1144
0
        else if (af == AF_INET6) {
1145
0
            if (cmsg->cmsg_level != IPPROTO_IPV6)
1146
0
                continue;
1147
1148
0
#    if defined(IPV6_RECVPKTINFO)
1149
0
            if (cmsg->cmsg_type != IPV6_PKTINFO)
1150
0
                continue;
1151
1152
0
            {
1153
0
                bio_dgram_data *data = b->ptr;
1154
1155
0
                local->s_in6.sin6_addr     =
1156
0
                    ((struct in6_pktinfo *)BIO_CMSG_DATA(cmsg))->ipi6_addr;
1157
0
                local->s_in6.sin6_family   = AF_INET6;
1158
0
                local->s_in6.sin6_port     = data->local_addr.s_in6.sin6_port;
1159
0
                local->s_in6.sin6_scope_id =
1160
0
                    data->local_addr.s_in6.sin6_scope_id;
1161
0
                local->s_in6.sin6_flowinfo = 0;
1162
0
            }
1163
0
            return 1;
1164
0
#    endif
1165
0
        }
1166
0
#   endif
1167
0
    }
1168
0
#  endif
1169
1170
0
    return 0;
1171
0
}
1172
1173
0
static int pack_local(BIO *b, MSGHDR_TYPE *mh, const BIO_ADDR *local) {
1174
0
    int af = dgram_get_sock_family(b);
1175
0
#  if defined(IP_PKTINFO) || defined(IP_RECVDSTADDR) || defined(IPV6_PKTINFO)
1176
0
    CMSGHDR_TYPE *cmsg;
1177
0
    bio_dgram_data *data = b->ptr;
1178
0
#  endif
1179
1180
0
    if (af == AF_INET) {
1181
0
#  if defined(IP_PKTINFO)
1182
0
        struct in_pktinfo *info;
1183
1184
#   if defined(OPENSSL_SYS_WINDOWS)
1185
        cmsg = (CMSGHDR_TYPE *)mh->Control.buf;
1186
#   else
1187
0
        cmsg = (CMSGHDR_TYPE *)mh->msg_control;
1188
0
#   endif
1189
1190
0
        cmsg->cmsg_len   = BIO_CMSG_LEN(sizeof(struct in_pktinfo));
1191
0
        cmsg->cmsg_level = IPPROTO_IP;
1192
0
        cmsg->cmsg_type  = IP_PKTINFO;
1193
1194
0
        info = (struct in_pktinfo *)BIO_CMSG_DATA(cmsg);
1195
0
#   if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_CYGWIN) && !defined(__FreeBSD__) && !defined(__QNX__)
1196
0
        info->ipi_spec_dst      = local->s_in.sin_addr;
1197
0
#   endif
1198
0
        info->ipi_addr.s_addr   = 0;
1199
0
        info->ipi_ifindex       = 0;
1200
1201
        /*
1202
         * We cannot override source port using this API, therefore
1203
         * ensure the application specified a source port of 0
1204
         * or the one we are bound to. (Better to error than silently
1205
         * ignore this.)
1206
         */
1207
0
        if (local->s_in.sin_port != 0
1208
0
            && data->local_addr.s_in.sin_port != local->s_in.sin_port) {
1209
0
            ERR_raise(ERR_LIB_BIO, BIO_R_PORT_MISMATCH);
1210
0
            return 0;
1211
0
        }
1212
1213
#   if defined(OPENSSL_SYS_WINDOWS)
1214
        mh->Control.len = BIO_CMSG_SPACE(sizeof(struct in_pktinfo));
1215
#   else
1216
0
        mh->msg_controllen = BIO_CMSG_SPACE(sizeof(struct in_pktinfo));
1217
0
#   endif
1218
0
        return 1;
1219
1220
#  elif defined(IP_SENDSRCADDR)
1221
        struct in_addr *info;
1222
1223
        /*
1224
         * At least FreeBSD is very pedantic about using IP_SENDSRCADDR when we
1225
         * are not bound to 0.0.0.0 or ::, even if the address matches what we
1226
         * bound to. Support this by not packing the structure if the address
1227
         * matches our understanding of our local address. IP_SENDSRCADDR is a
1228
         * BSD thing, so we don't need an explicit test for BSD here.
1229
         */
1230
        if (local->s_in.sin_addr.s_addr == data->local_addr.s_in.sin_addr.s_addr) {
1231
            mh->msg_control    = NULL;
1232
            mh->msg_controllen = 0;
1233
            return 1;
1234
        }
1235
1236
        cmsg = (struct cmsghdr *)mh->msg_control;
1237
        cmsg->cmsg_len   = BIO_CMSG_LEN(sizeof(struct in_addr));
1238
        cmsg->cmsg_level = IPPROTO_IP;
1239
        cmsg->cmsg_type  = IP_SENDSRCADDR;
1240
1241
        info = (struct in_addr *)BIO_CMSG_DATA(cmsg);
1242
        *info = local->s_in.sin_addr;
1243
1244
        /* See comment above. */
1245
        if (local->s_in.sin_port != 0
1246
            && data->local_addr.s_in.sin_port != local->s_in.sin_port) {
1247
            ERR_raise(ERR_LIB_BIO, BIO_R_PORT_MISMATCH);
1248
            return 0;
1249
        }
1250
1251
        mh->msg_controllen = BIO_CMSG_SPACE(sizeof(struct in_addr));
1252
        return 1;
1253
#  endif
1254
0
    }
1255
0
#  if OPENSSL_USE_IPV6
1256
0
    else if (af == AF_INET6) {
1257
0
#   if defined(IPV6_PKTINFO)
1258
0
        struct in6_pktinfo *info;
1259
1260
#    if defined(OPENSSL_SYS_WINDOWS)
1261
        cmsg = (CMSGHDR_TYPE *)mh->Control.buf;
1262
#    else
1263
0
        cmsg = (CMSGHDR_TYPE *)mh->msg_control;
1264
0
#    endif
1265
0
        cmsg->cmsg_len   = BIO_CMSG_LEN(sizeof(struct in6_pktinfo));
1266
0
        cmsg->cmsg_level = IPPROTO_IPV6;
1267
0
        cmsg->cmsg_type  = IPV6_PKTINFO;
1268
1269
0
        info = (struct in6_pktinfo *)BIO_CMSG_DATA(cmsg);
1270
0
        info->ipi6_addr     = local->s_in6.sin6_addr;
1271
0
        info->ipi6_ifindex  = 0;
1272
1273
        /*
1274
         * See comment above, but also applies to the other fields
1275
         * in sockaddr_in6.
1276
         */
1277
0
        if (local->s_in6.sin6_port != 0
1278
0
            && data->local_addr.s_in6.sin6_port != local->s_in6.sin6_port) {
1279
0
            ERR_raise(ERR_LIB_BIO, BIO_R_PORT_MISMATCH);
1280
0
            return 0;
1281
0
        }
1282
1283
0
        if (local->s_in6.sin6_scope_id != 0
1284
0
            && data->local_addr.s_in6.sin6_scope_id != local->s_in6.sin6_scope_id) {
1285
0
            ERR_raise(ERR_LIB_BIO, BIO_R_PORT_MISMATCH);
1286
0
            return 0;
1287
0
        }
1288
1289
#    if defined(OPENSSL_SYS_WINDOWS)
1290
        mh->Control.len = BIO_CMSG_SPACE(sizeof(struct in6_pktinfo));
1291
#    else
1292
0
        mh->msg_controllen = BIO_CMSG_SPACE(sizeof(struct in6_pktinfo));
1293
0
#    endif
1294
0
        return 1;
1295
0
#   endif
1296
0
    }
1297
0
#  endif
1298
1299
0
    return 0;
1300
0
}
1301
# endif
1302
1303
/*
1304
 * Converts flags passed to BIO_sendmmsg or BIO_recvmmsg to syscall flags. You
1305
 * should mask out any system flags returned by this function you cannot support
1306
 * in a particular circumstance. Currently no flags are defined.
1307
 */
1308
# if M_METHOD != M_METHOD_NONE
1309
0
static int translate_flags(uint64_t flags) {
1310
0
    return 0;
1311
0
}
1312
# endif
1313
1314
static int dgram_sendmmsg(BIO *b, BIO_MSG *msg, size_t stride,
1315
                          size_t num_msg, uint64_t flags, size_t *num_processed)
1316
0
{
1317
0
# if M_METHOD != M_METHOD_NONE && M_METHOD != M_METHOD_RECVMSG
1318
0
    int ret;
1319
0
# endif
1320
0
# if M_METHOD == M_METHOD_RECVMMSG
1321
0
#  define BIO_MAX_MSGS_PER_CALL   64
1322
0
    int sysflags;
1323
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1324
0
    size_t i;
1325
0
    struct mmsghdr mh[BIO_MAX_MSGS_PER_CALL];
1326
0
    struct iovec iov[BIO_MAX_MSGS_PER_CALL];
1327
0
    unsigned char control[BIO_MAX_MSGS_PER_CALL][BIO_CMSG_ALLOC_LEN];
1328
0
    int have_local_enabled = data->local_addr_enabled;
1329
# elif M_METHOD == M_METHOD_RECVMSG
1330
    int sysflags;
1331
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1332
    ossl_ssize_t l;
1333
    struct msghdr mh;
1334
    struct iovec iov;
1335
    unsigned char control[BIO_CMSG_ALLOC_LEN];
1336
    int have_local_enabled = data->local_addr_enabled;
1337
# elif M_METHOD == M_METHOD_WSARECVMSG
1338
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1339
    int have_local_enabled = data->local_addr_enabled;
1340
    WSAMSG wmsg;
1341
    WSABUF wbuf;
1342
    DWORD num_bytes_sent = 0;
1343
    unsigned char control[BIO_CMSG_ALLOC_LEN];
1344
# endif
1345
# if M_METHOD == M_METHOD_RECVFROM || M_METHOD == M_METHOD_WSARECVMSG
1346
    int sysflags;
1347
# endif
1348
1349
0
    if (num_msg == 0) {
1350
0
        *num_processed = 0;
1351
0
        return 1;
1352
0
    }
1353
1354
0
    if (num_msg > OSSL_SSIZE_MAX)
1355
0
        num_msg = OSSL_SSIZE_MAX;
1356
1357
0
# if M_METHOD != M_METHOD_NONE
1358
0
    sysflags = translate_flags(flags);
1359
0
# endif
1360
1361
0
# if M_METHOD == M_METHOD_RECVMMSG
1362
    /*
1363
     * In the sendmmsg/recvmmsg case, we need to allocate our translated struct
1364
     * msghdr and struct iovec on the stack to support multithreaded use. Thus
1365
     * we place a fixed limit on the number of messages per call, in the
1366
     * expectation that we will be called again if there were more messages to
1367
     * be sent.
1368
     */
1369
0
    if (num_msg > BIO_MAX_MSGS_PER_CALL)
1370
0
        num_msg = BIO_MAX_MSGS_PER_CALL;
1371
1372
0
    for (i = 0; i < num_msg; ++i) {
1373
0
        translate_msg(b, &mh[i].msg_hdr, &iov[i],
1374
0
                      control[i], &BIO_MSG_N(msg, stride, i));
1375
1376
        /* If local address was requested, it must have been enabled */
1377
0
        if (BIO_MSG_N(msg, stride, i).local != NULL) {
1378
0
            if (!have_local_enabled) {
1379
0
                ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1380
0
                *num_processed = 0;
1381
0
                return 0;
1382
0
            }
1383
1384
0
            if (pack_local(b, &mh[i].msg_hdr,
1385
0
                           BIO_MSG_N(msg, stride, i).local) < 1) {
1386
0
                ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1387
0
                *num_processed = 0;
1388
0
                return 0;
1389
0
            }
1390
0
        }
1391
0
    }
1392
1393
    /* Do the batch */
1394
0
    ret = sendmmsg(b->num, mh, num_msg, sysflags);
1395
0
    if (ret < 0) {
1396
0
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1397
0
        *num_processed = 0;
1398
0
        return 0;
1399
0
    }
1400
1401
0
    for (i = 0; i < (size_t)ret; ++i) {
1402
0
        BIO_MSG_N(msg, stride, i).data_len = mh[i].msg_len;
1403
0
        BIO_MSG_N(msg, stride, i).flags    = 0;
1404
0
    }
1405
1406
0
    *num_processed = (size_t)ret;
1407
0
    return 1;
1408
1409
# elif M_METHOD == M_METHOD_RECVMSG
1410
    /*
1411
     * If sendmsg is available, use it.
1412
     */
1413
    translate_msg(b, &mh, &iov, control, msg);
1414
1415
    if (msg->local != NULL) {
1416
        if (!have_local_enabled) {
1417
            ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1418
            *num_processed = 0;
1419
            return 0;
1420
        }
1421
1422
        if (pack_local(b, &mh, msg->local) < 1) {
1423
            ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1424
            *num_processed = 0;
1425
            return 0;
1426
        }
1427
    }
1428
1429
    l = sendmsg(b->num, &mh, sysflags);
1430
    if (l < 0) {
1431
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1432
        *num_processed = 0;
1433
        return 0;
1434
    }
1435
1436
    msg->data_len   = (size_t)l;
1437
    msg->flags      = 0;
1438
    *num_processed  = 1;
1439
    return 1;
1440
1441
# elif M_METHOD == M_METHOD_WSARECVMSG || M_METHOD == M_METHOD_RECVFROM
1442
#  if M_METHOD == M_METHOD_WSARECVMSG
1443
    if (bio_WSASendMsg != NULL) {
1444
        /* WSASendMsg-based implementation for Windows. */
1445
        translate_msg_win(b, &wmsg, &wbuf, control, msg);
1446
1447
        if (msg[0].local != NULL) {
1448
            if (!have_local_enabled) {
1449
                ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1450
                *num_processed = 0;
1451
                return 0;
1452
            }
1453
1454
            if (pack_local(b, &wmsg, msg[0].local) < 1) {
1455
                ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1456
                *num_processed = 0;
1457
                return 0;
1458
            }
1459
        }
1460
1461
        ret = WSASendMsg((SOCKET)b->num, &wmsg, 0, &num_bytes_sent, NULL, NULL);
1462
        if (ret < 0) {
1463
            ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1464
            *num_processed = 0;
1465
            return 0;
1466
        }
1467
1468
        msg[0].data_len = num_bytes_sent;
1469
        msg[0].flags    = 0;
1470
        *num_processed  = 1;
1471
        return 1;
1472
    }
1473
#  endif
1474
1475
    /*
1476
     * Fallback to sendto and send a single message.
1477
     */
1478
    if (msg[0].local != NULL) {
1479
        /*
1480
         * We cannot set the local address if using sendto
1481
         * so fail in this case
1482
         */
1483
        ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1484
        *num_processed = 0;
1485
        return 0;
1486
    }
1487
1488
    ret = sendto(b->num, msg[0].data,
1489
#  if defined(OPENSSL_SYS_WINDOWS)
1490
                 (int)msg[0].data_len,
1491
#  else
1492
                 msg[0].data_len,
1493
#  endif
1494
                 sysflags,
1495
                 msg[0].peer != NULL ? BIO_ADDR_sockaddr(msg[0].peer) : NULL,
1496
                 msg[0].peer != NULL ? BIO_ADDR_sockaddr_size(msg[0].peer) : 0);
1497
    if (ret <= 0) {
1498
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1499
        *num_processed = 0;
1500
        return 0;
1501
    }
1502
1503
    msg[0].data_len = ret;
1504
    msg[0].flags    = 0;
1505
    *num_processed  = 1;
1506
    return 1;
1507
1508
# else
1509
    ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
1510
    *num_processed = 0;
1511
    return 0;
1512
# endif
1513
0
}
1514
1515
static int dgram_recvmmsg(BIO *b, BIO_MSG *msg,
1516
                          size_t stride, size_t num_msg,
1517
                          uint64_t flags, size_t *num_processed)
1518
0
{
1519
0
# if M_METHOD != M_METHOD_NONE && M_METHOD != M_METHOD_RECVMSG
1520
0
    int ret;
1521
0
# endif
1522
0
# if M_METHOD == M_METHOD_RECVMMSG
1523
0
    int sysflags;
1524
0
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1525
0
    size_t i;
1526
0
    struct mmsghdr mh[BIO_MAX_MSGS_PER_CALL];
1527
0
    struct iovec iov[BIO_MAX_MSGS_PER_CALL];
1528
0
    unsigned char control[BIO_MAX_MSGS_PER_CALL][BIO_CMSG_ALLOC_LEN];
1529
0
    int have_local_enabled = data->local_addr_enabled;
1530
# elif M_METHOD == M_METHOD_RECVMSG
1531
    int sysflags;
1532
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1533
    ossl_ssize_t l;
1534
    struct msghdr mh;
1535
    struct iovec iov;
1536
    unsigned char control[BIO_CMSG_ALLOC_LEN];
1537
    int have_local_enabled = data->local_addr_enabled;
1538
# elif M_METHOD == M_METHOD_WSARECVMSG
1539
    bio_dgram_data *data = (bio_dgram_data *)b->ptr;
1540
    int have_local_enabled = data->local_addr_enabled;
1541
    WSAMSG wmsg;
1542
    WSABUF wbuf;
1543
    DWORD num_bytes_received = 0;
1544
    unsigned char control[BIO_CMSG_ALLOC_LEN];
1545
# endif
1546
# if M_METHOD == M_METHOD_RECVFROM || M_METHOD == M_METHOD_WSARECVMSG
1547
    int sysflags;
1548
    socklen_t slen;
1549
# endif
1550
1551
0
    if (num_msg == 0) {
1552
0
        *num_processed = 0;
1553
0
        return 1;
1554
0
    }
1555
1556
0
    if (num_msg > OSSL_SSIZE_MAX)
1557
0
        num_msg = OSSL_SSIZE_MAX;
1558
1559
0
# if M_METHOD != M_METHOD_NONE
1560
0
    sysflags = translate_flags(flags);
1561
0
# endif
1562
1563
0
# if M_METHOD == M_METHOD_RECVMMSG
1564
    /*
1565
     * In the sendmmsg/recvmmsg case, we need to allocate our translated struct
1566
     * msghdr and struct iovec on the stack to support multithreaded use. Thus
1567
     * we place a fixed limit on the number of messages per call, in the
1568
     * expectation that we will be called again if there were more messages to
1569
     * be sent.
1570
     */
1571
0
    if (num_msg > BIO_MAX_MSGS_PER_CALL)
1572
0
        num_msg = BIO_MAX_MSGS_PER_CALL;
1573
1574
0
    for (i = 0; i < num_msg; ++i) {
1575
0
        translate_msg(b, &mh[i].msg_hdr, &iov[i],
1576
0
                      control[i], &BIO_MSG_N(msg, stride, i));
1577
1578
        /* If local address was requested, it must have been enabled */
1579
0
        if (BIO_MSG_N(msg, stride, i).local != NULL && !have_local_enabled) {
1580
0
            ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1581
0
            *num_processed = 0;
1582
0
            return 0;
1583
0
        }
1584
0
    }
1585
1586
    /* Do the batch */
1587
0
    ret = recvmmsg(b->num, mh, num_msg, sysflags, NULL);
1588
0
    if (ret < 0) {
1589
0
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1590
0
        *num_processed = 0;
1591
0
        return 0;
1592
0
    }
1593
1594
0
    for (i = 0; i < (size_t)ret; ++i) {
1595
0
        BIO_MSG_N(msg, stride, i).data_len = mh[i].msg_len;
1596
0
        BIO_MSG_N(msg, stride, i).flags    = 0;
1597
        /*
1598
         * *(msg->peer) will have been filled in by recvmmsg;
1599
         * for msg->local we parse the control data returned
1600
         */
1601
0
        if (BIO_MSG_N(msg, stride, i).local != NULL)
1602
0
            if (extract_local(b, &mh[i].msg_hdr,
1603
0
                              BIO_MSG_N(msg, stride, i).local) < 1)
1604
                /*
1605
                 * It appears BSDs do not support local addresses for
1606
                 * loopback sockets. In this case, just clear the local
1607
                 * address, as for OS X and Windows in some circumstances
1608
                 * (see below).
1609
                 */
1610
0
                BIO_ADDR_clear(msg->local);
1611
0
    }
1612
1613
0
    *num_processed = (size_t)ret;
1614
0
    return 1;
1615
1616
# elif M_METHOD == M_METHOD_RECVMSG
1617
    /*
1618
     * If recvmsg is available, use it.
1619
     */
1620
    translate_msg(b, &mh, &iov, control, msg);
1621
1622
    /* If local address was requested, it must have been enabled */
1623
    if (msg->local != NULL && !have_local_enabled) {
1624
        /*
1625
         * If we have done at least one message, we must return the
1626
         * count; if we haven't done any, we can give an error code
1627
         */
1628
        ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1629
        *num_processed = 0;
1630
        return 0;
1631
    }
1632
1633
    l = recvmsg(b->num, &mh, sysflags);
1634
    if (l < 0) {
1635
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1636
        *num_processed = 0;
1637
        return 0;
1638
    }
1639
1640
    msg->data_len   = (size_t)l;
1641
    msg->flags      = 0;
1642
1643
    if (msg->local != NULL)
1644
        if (extract_local(b, &mh, msg->local) < 1)
1645
            /*
1646
             * OS X exhibits odd behaviour where it appears that if a packet is
1647
             * sent before the receiving interface enables IP_PKTINFO, it will
1648
             * sometimes not have any control data returned even if the
1649
             * receiving interface enables IP_PKTINFO before calling recvmsg().
1650
             * This appears to occur non-deterministically. Presumably, OS X
1651
             * handles IP_PKTINFO at the time the packet is enqueued into a
1652
             * socket's receive queue, rather than at the time recvmsg() is
1653
             * called, unlike most other operating systems. Thus (if this
1654
             * hypothesis is correct) there is a race between where IP_PKTINFO
1655
             * is enabled by the process and when the kernel's network stack
1656
             * queues the incoming message.
1657
             *
1658
             * We cannot return the local address if we do not have it, but this
1659
             * is not a caller error either, so just return a zero address
1660
             * structure. This is similar to how we handle Windows loopback
1661
             * interfaces (see below). We enable this workaround for all
1662
             * platforms, not just Apple, as this kind of quirk in OS networking
1663
             * stacks seems to be common enough that failing hard if a local
1664
             * address is not provided appears to be too brittle.
1665
             */
1666
            BIO_ADDR_clear(msg->local);
1667
1668
    *num_processed = 1;
1669
    return 1;
1670
1671
# elif M_METHOD == M_METHOD_RECVFROM || M_METHOD == M_METHOD_WSARECVMSG
1672
#  if M_METHOD == M_METHOD_WSARECVMSG
1673
    if (bio_WSARecvMsg != NULL) {
1674
        /* WSARecvMsg-based implementation for Windows. */
1675
        translate_msg_win(b, &wmsg, &wbuf, control, msg);
1676
1677
        /* If local address was requested, it must have been enabled */
1678
        if (msg[0].local != NULL && !have_local_enabled) {
1679
            ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1680
            *num_processed = 0;
1681
            return 0;
1682
        }
1683
1684
        ret = WSARecvMsg((SOCKET)b->num, &wmsg, &num_bytes_received, NULL, NULL);
1685
        if (ret < 0) {
1686
            ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1687
            *num_processed = 0;
1688
            return 0;
1689
        }
1690
1691
        msg[0].data_len = num_bytes_received;
1692
        msg[0].flags    = 0;
1693
        if (msg[0].local != NULL)
1694
            if (extract_local(b, &wmsg, msg[0].local) < 1)
1695
                /*
1696
                 * On Windows, loopback is not a "proper" interface and it works
1697
                 * differently; packets are essentially short-circuited and
1698
                 * don't go through all of the normal processing. A consequence
1699
                 * of this is that packets sent from the local machine to the
1700
                 * local machine _will not have IP_PKTINFO_ even if the
1701
                 * IP_PKTINFO socket option is enabled. WSARecvMsg just sets
1702
                 * Control.len to 0 on returning.
1703
                 *
1704
                 * This applies regardless of whether the loopback address,
1705
                 * 127.0.0.1 is used, or a local interface address (e.g.
1706
                 * 192.168.1.1); in both cases IP_PKTINFO will not be present.
1707
                 *
1708
                 * We report this condition by setting the local BIO_ADDR's
1709
                 * family to 0.
1710
                 */
1711
                BIO_ADDR_clear(msg[0].local);
1712
1713
        *num_processed = 1;
1714
        return 1;
1715
    }
1716
#  endif
1717
1718
    /*
1719
     * Fallback to recvfrom and receive a single message.
1720
     */
1721
    if (msg[0].local != NULL) {
1722
        /*
1723
         * We cannot determine the local address if using recvfrom
1724
         * so fail in this case
1725
         */
1726
        ERR_raise(ERR_LIB_BIO, BIO_R_LOCAL_ADDR_NOT_AVAILABLE);
1727
        *num_processed = 0;
1728
        return 0;
1729
    }
1730
1731
    slen = sizeof(*msg[0].peer);
1732
    ret = recvfrom(b->num, msg[0].data,
1733
#  if defined(OPENSSL_SYS_WINDOWS)
1734
                   (int)msg[0].data_len,
1735
#  else
1736
                   msg[0].data_len,
1737
#  endif
1738
                   sysflags,
1739
                   msg[0].peer != NULL ? &msg[0].peer->sa : NULL,
1740
                   msg[0].peer != NULL ? &slen : NULL);
1741
    if (ret <= 0) {
1742
        ERR_raise(ERR_LIB_SYS, get_last_socket_error());
1743
        return 0;
1744
    }
1745
1746
    msg[0].data_len = ret;
1747
    msg[0].flags    = 0;
1748
    *num_processed = 1;
1749
    return 1;
1750
1751
# else
1752
    ERR_raise(ERR_LIB_BIO, BIO_R_UNSUPPORTED_METHOD);
1753
    *num_processed = 0;
1754
    return 0;
1755
# endif
1756
0
}
1757
1758
# ifndef OPENSSL_NO_SCTP
1759
const BIO_METHOD *BIO_s_datagram_sctp(void)
1760
{
1761
    return &methods_dgramp_sctp;
1762
}
1763
1764
BIO *BIO_new_dgram_sctp(int fd, int close_flag)
1765
{
1766
    BIO *bio;
1767
    int ret, optval = 20000;
1768
    int auth_data = 0, auth_forward = 0;
1769
    unsigned char *p;
1770
    struct sctp_authchunk auth;
1771
    struct sctp_authchunks *authchunks;
1772
    socklen_t sockopt_len;
1773
#  ifdef SCTP_AUTHENTICATION_EVENT
1774
#   ifdef SCTP_EVENT
1775
    struct sctp_event event;
1776
#   else
1777
    struct sctp_event_subscribe event;
1778
#   endif
1779
#  endif
1780
1781
    bio = BIO_new(BIO_s_datagram_sctp());
1782
    if (bio == NULL)
1783
        return NULL;
1784
    BIO_set_fd(bio, fd, close_flag);
1785
1786
    /* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
1787
    auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
1788
    ret =
1789
        setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
1790
                   sizeof(struct sctp_authchunk));
1791
    if (ret < 0) {
1792
        BIO_vfree(bio);
1793
        ERR_raise_data(ERR_LIB_BIO, ERR_R_SYS_LIB,
1794
                       "Ensure SCTP AUTH chunks are enabled in kernel");
1795
        return NULL;
1796
    }
1797
    auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
1798
    ret =
1799
        setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth,
1800
                   sizeof(struct sctp_authchunk));
1801
    if (ret < 0) {
1802
        BIO_vfree(bio);
1803
        ERR_raise_data(ERR_LIB_BIO, ERR_R_SYS_LIB,
1804
                       "Ensure SCTP AUTH chunks are enabled in kernel");
1805
        return NULL;
1806
    }
1807
1808
    /*
1809
     * Test if activation was successful. When using accept(), SCTP-AUTH has
1810
     * to be activated for the listening socket already, otherwise the
1811
     * connected socket won't use it. Similarly with connect(): the socket
1812
     * prior to connection must be activated for SCTP-AUTH
1813
     */
1814
    sockopt_len = (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
1815
    authchunks = OPENSSL_zalloc(sockopt_len);
1816
    if (authchunks == NULL) {
1817
        BIO_vfree(bio);
1818
        return NULL;
1819
    }
1820
    ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks,
1821
                   &sockopt_len);
1822
    if (ret < 0) {
1823
        OPENSSL_free(authchunks);
1824
        BIO_vfree(bio);
1825
        return NULL;
1826
    }
1827
1828
    for (p = (unsigned char *)authchunks->gauth_chunks;
1829
         p < (unsigned char *)authchunks + sockopt_len;
1830
         p += sizeof(uint8_t)) {
1831
        if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
1832
            auth_data = 1;
1833
        if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
1834
            auth_forward = 1;
1835
    }
1836
1837
    OPENSSL_free(authchunks);
1838
1839
    if (!auth_data || !auth_forward) {
1840
        BIO_vfree(bio);
1841
        ERR_raise_data(ERR_LIB_BIO, ERR_R_SYS_LIB,
1842
                       "Ensure SCTP AUTH chunks are enabled on the "
1843
                       "underlying socket");
1844
        return NULL;
1845
    }
1846
1847
#  ifdef SCTP_AUTHENTICATION_EVENT
1848
#   ifdef SCTP_EVENT
1849
    memset(&event, 0, sizeof(event));
1850
    event.se_assoc_id = 0;
1851
    event.se_type = SCTP_AUTHENTICATION_EVENT;
1852
    event.se_on = 1;
1853
    ret =
1854
        setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event,
1855
                   sizeof(struct sctp_event));
1856
    if (ret < 0) {
1857
        BIO_vfree(bio);
1858
        return NULL;
1859
    }
1860
#   else
1861
    sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
1862
    ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
1863
    if (ret < 0) {
1864
        BIO_vfree(bio);
1865
        return NULL;
1866
    }
1867
1868
    event.sctp_authentication_event = 1;
1869
1870
    ret =
1871
        setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event,
1872
                   sizeof(struct sctp_event_subscribe));
1873
    if (ret < 0) {
1874
        BIO_vfree(bio);
1875
        return NULL;
1876
    }
1877
#   endif
1878
#  endif
1879
1880
    /*
1881
     * Disable partial delivery by setting the min size larger than the max
1882
     * record size of 2^14 + 2048 + 13
1883
     */
1884
    ret =
1885
        setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
1886
                   sizeof(optval));
1887
    if (ret < 0) {
1888
        BIO_vfree(bio);
1889
        return NULL;
1890
    }
1891
1892
    return bio;
1893
}
1894
1895
int BIO_dgram_is_sctp(BIO *bio)
1896
{
1897
    return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
1898
}
1899
1900
static int dgram_sctp_new(BIO *bi)
1901
{
1902
    bio_dgram_sctp_data *data = NULL;
1903
1904
    bi->init = 0;
1905
    bi->num = 0;
1906
    if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL)
1907
        return 0;
1908
#  ifdef SCTP_PR_SCTP_NONE
1909
    data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
1910
#  endif
1911
    bi->ptr = data;
1912
1913
    bi->flags = 0;
1914
    return 1;
1915
}
1916
1917
static int dgram_sctp_free(BIO *a)
1918
{
1919
    bio_dgram_sctp_data *data;
1920
1921
    if (a == NULL)
1922
        return 0;
1923
    if (!dgram_clear(a))
1924
        return 0;
1925
1926
    data = (bio_dgram_sctp_data *) a->ptr;
1927
    if (data != NULL)
1928
        OPENSSL_free(data);
1929
1930
    return 1;
1931
}
1932
1933
#  ifdef SCTP_AUTHENTICATION_EVENT
1934
void dgram_sctp_handle_auth_free_key_event(BIO *b,
1935
                                           union sctp_notification *snp)
1936
{
1937
    int ret;
1938
    struct sctp_authkey_event *authkeyevent = &snp->sn_auth_event;
1939
1940
    if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY) {
1941
        struct sctp_authkeyid authkeyid;
1942
1943
        /* delete key */
1944
        authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
1945
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
1946
                         &authkeyid, sizeof(struct sctp_authkeyid));
1947
    }
1948
}
1949
#  endif
1950
1951
static int dgram_sctp_read(BIO *b, char *out, int outl)
1952
{
1953
    int ret = 0, n = 0, i, optval;
1954
    socklen_t optlen;
1955
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
1956
    struct msghdr msg;
1957
    struct iovec iov;
1958
    struct cmsghdr *cmsg;
1959
    char cmsgbuf[512];
1960
1961
    if (out != NULL) {
1962
        clear_socket_error();
1963
1964
        do {
1965
            memset(&data->rcvinfo, 0, sizeof(data->rcvinfo));
1966
            iov.iov_base = out;
1967
            iov.iov_len = outl;
1968
            msg.msg_name = NULL;
1969
            msg.msg_namelen = 0;
1970
            msg.msg_iov = &iov;
1971
            msg.msg_iovlen = 1;
1972
            msg.msg_control = cmsgbuf;
1973
            msg.msg_controllen = 512;
1974
            msg.msg_flags = 0;
1975
            n = recvmsg(b->num, &msg, 0);
1976
1977
            if (n <= 0) {
1978
                if (n < 0)
1979
                    ret = n;
1980
                break;
1981
            }
1982
1983
            if (msg.msg_controllen > 0) {
1984
                for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
1985
                     cmsg = CMSG_NXTHDR(&msg, cmsg)) {
1986
                    if (cmsg->cmsg_level != IPPROTO_SCTP)
1987
                        continue;
1988
#  ifdef SCTP_RCVINFO
1989
                    if (cmsg->cmsg_type == SCTP_RCVINFO) {
1990
                        struct sctp_rcvinfo *rcvinfo;
1991
1992
                        rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
1993
                        data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
1994
                        data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
1995
                        data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
1996
                        data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
1997
                        data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
1998
                        data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
1999
                        data->rcvinfo.rcv_context = rcvinfo->rcv_context;
2000
                    }
2001
#  endif
2002
#  ifdef SCTP_SNDRCV
2003
                    if (cmsg->cmsg_type == SCTP_SNDRCV) {
2004
                        struct sctp_sndrcvinfo *sndrcvinfo;
2005
2006
                        sndrcvinfo =
2007
                            (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
2008
                        data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
2009
                        data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
2010
                        data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
2011
                        data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
2012
                        data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
2013
                        data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
2014
                        data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
2015
                    }
2016
#  endif
2017
                }
2018
            }
2019
2020
            if (msg.msg_flags & MSG_NOTIFICATION) {
2021
                union sctp_notification snp;
2022
2023
                memcpy(&snp, out, sizeof(snp));
2024
                if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
2025
#  ifdef SCTP_EVENT
2026
                    struct sctp_event event;
2027
#  else
2028
                    struct sctp_event_subscribe event;
2029
                    socklen_t eventsize;
2030
#  endif
2031
2032
                    /* disable sender dry event */
2033
#  ifdef SCTP_EVENT
2034
                    memset(&event, 0, sizeof(event));
2035
                    event.se_assoc_id = 0;
2036
                    event.se_type = SCTP_SENDER_DRY_EVENT;
2037
                    event.se_on = 0;
2038
                    i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
2039
                                   sizeof(struct sctp_event));
2040
                    if (i < 0) {
2041
                        ret = i;
2042
                        break;
2043
                    }
2044
#  else
2045
                    eventsize = sizeof(struct sctp_event_subscribe);
2046
                    i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
2047
                                   &eventsize);
2048
                    if (i < 0) {
2049
                        ret = i;
2050
                        break;
2051
                    }
2052
2053
                    event.sctp_sender_dry_event = 0;
2054
2055
                    i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
2056
                                   sizeof(struct sctp_event_subscribe));
2057
                    if (i < 0) {
2058
                        ret = i;
2059
                        break;
2060
                    }
2061
#  endif
2062
                }
2063
#  ifdef SCTP_AUTHENTICATION_EVENT
2064
                if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
2065
                    dgram_sctp_handle_auth_free_key_event(b, &snp);
2066
#  endif
2067
2068
                if (data->handle_notifications != NULL)
2069
                    data->handle_notifications(b, data->notification_context,
2070
                                               (void *)out);
2071
2072
                memset(&snp, 0, sizeof(snp));
2073
                memset(out, 0, outl);
2074
            } else {
2075
                ret += n;
2076
            }
2077
        }
2078
        while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR)
2079
               && (ret < outl));
2080
2081
        if (ret > 0 && !(msg.msg_flags & MSG_EOR)) {
2082
            /* Partial message read, this should never happen! */
2083
2084
            /*
2085
             * The buffer was too small, this means the peer sent a message
2086
             * that was larger than allowed.
2087
             */
2088
            if (ret == outl)
2089
                return -1;
2090
2091
            /*
2092
             * Test if socket buffer can handle max record size (2^14 + 2048
2093
             * + 13)
2094
             */
2095
            optlen = (socklen_t) sizeof(int);
2096
            ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
2097
            if (ret >= 0)
2098
                OPENSSL_assert(optval >= 18445);
2099
2100
            /*
2101
             * Test if SCTP doesn't partially deliver below max record size
2102
             * (2^14 + 2048 + 13)
2103
             */
2104
            optlen = (socklen_t) sizeof(int);
2105
            ret =
2106
                getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
2107
                           &optval, &optlen);
2108
            if (ret >= 0)
2109
                OPENSSL_assert(optval >= 18445);
2110
2111
            /*
2112
             * Partially delivered notification??? Probably a bug....
2113
             */
2114
            OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
2115
2116
            /*
2117
             * Everything seems ok till now, so it's most likely a message
2118
             * dropped by PR-SCTP.
2119
             */
2120
            memset(out, 0, outl);
2121
            BIO_set_retry_read(b);
2122
            return -1;
2123
        }
2124
2125
        BIO_clear_retry_flags(b);
2126
        if (ret < 0) {
2127
            if (BIO_dgram_should_retry(ret)) {
2128
                BIO_set_retry_read(b);
2129
                data->dgram._errno = get_last_socket_error();
2130
            }
2131
        }
2132
2133
        /* Test if peer uses SCTP-AUTH before continuing */
2134
        if (!data->peer_auth_tested) {
2135
            int ii, auth_data = 0, auth_forward = 0;
2136
            unsigned char *p;
2137
            struct sctp_authchunks *authchunks;
2138
2139
            optlen =
2140
                (socklen_t) (sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
2141
            authchunks = OPENSSL_malloc(optlen);
2142
            if (authchunks == NULL)
2143
                return -1;
2144
            memset(authchunks, 0, optlen);
2145
            ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS,
2146
                            authchunks, &optlen);
2147
2148
            if (ii >= 0)
2149
                for (p = (unsigned char *)authchunks->gauth_chunks;
2150
                     p < (unsigned char *)authchunks + optlen;
2151
                     p += sizeof(uint8_t)) {
2152
                    if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE)
2153
                        auth_data = 1;
2154
                    if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE)
2155
                        auth_forward = 1;
2156
                }
2157
2158
            OPENSSL_free(authchunks);
2159
2160
            if (!auth_data || !auth_forward) {
2161
                ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR);
2162
                return -1;
2163
            }
2164
2165
            data->peer_auth_tested = 1;
2166
        }
2167
    }
2168
    return ret;
2169
}
2170
2171
/*
2172
 * dgram_sctp_write - send message on SCTP socket
2173
 * @b: BIO to write to
2174
 * @in: data to send
2175
 * @inl: amount of bytes in @in to send
2176
 *
2177
 * Returns -1 on error or the sent amount of bytes on success
2178
 */
2179
static int dgram_sctp_write(BIO *b, const char *in, int inl)
2180
{
2181
    int ret;
2182
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
2183
    struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
2184
    struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
2185
    struct bio_dgram_sctp_sndinfo handshake_sinfo;
2186
    struct iovec iov[1];
2187
    struct msghdr msg;
2188
    struct cmsghdr *cmsg;
2189
#  if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
2190
    char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) +
2191
                 CMSG_SPACE(sizeof(struct sctp_prinfo))];
2192
    struct sctp_sndinfo *sndinfo;
2193
    struct sctp_prinfo *prinfo;
2194
#  else
2195
    char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
2196
    struct sctp_sndrcvinfo *sndrcvinfo;
2197
#  endif
2198
2199
    clear_socket_error();
2200
2201
    /*
2202
     * If we're send anything else than application data, disable all user
2203
     * parameters and flags.
2204
     */
2205
    if (in[0] != 23) {
2206
        memset(&handshake_sinfo, 0, sizeof(handshake_sinfo));
2207
#  ifdef SCTP_SACK_IMMEDIATELY
2208
        handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
2209
#  endif
2210
        sinfo = &handshake_sinfo;
2211
    }
2212
2213
    /* We can only send a shutdown alert if the socket is dry */
2214
    if (data->save_shutdown) {
2215
        ret = BIO_dgram_sctp_wait_for_dry(b);
2216
        if (ret < 0)
2217
            return -1;
2218
        if (ret == 0) {
2219
            BIO_clear_retry_flags(b);
2220
            BIO_set_retry_write(b);
2221
            return -1;
2222
        }
2223
    }
2224
2225
    iov[0].iov_base = (char *)in;
2226
    iov[0].iov_len = inl;
2227
    msg.msg_name = NULL;
2228
    msg.msg_namelen = 0;
2229
    msg.msg_iov = iov;
2230
    msg.msg_iovlen = 1;
2231
    msg.msg_control = (caddr_t) cmsgbuf;
2232
    msg.msg_controllen = 0;
2233
    msg.msg_flags = 0;
2234
#  if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
2235
    cmsg = (struct cmsghdr *)cmsgbuf;
2236
    cmsg->cmsg_level = IPPROTO_SCTP;
2237
    cmsg->cmsg_type = SCTP_SNDINFO;
2238
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
2239
    sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
2240
    memset(sndinfo, 0, sizeof(*sndinfo));
2241
    sndinfo->snd_sid = sinfo->snd_sid;
2242
    sndinfo->snd_flags = sinfo->snd_flags;
2243
    sndinfo->snd_ppid = sinfo->snd_ppid;
2244
    sndinfo->snd_context = sinfo->snd_context;
2245
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
2246
2247
    cmsg =
2248
        (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
2249
    cmsg->cmsg_level = IPPROTO_SCTP;
2250
    cmsg->cmsg_type = SCTP_PRINFO;
2251
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
2252
    prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
2253
    memset(prinfo, 0, sizeof(*prinfo));
2254
    prinfo->pr_policy = pinfo->pr_policy;
2255
    prinfo->pr_value = pinfo->pr_value;
2256
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
2257
#  else
2258
    cmsg = (struct cmsghdr *)cmsgbuf;
2259
    cmsg->cmsg_level = IPPROTO_SCTP;
2260
    cmsg->cmsg_type = SCTP_SNDRCV;
2261
    cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
2262
    sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
2263
    memset(sndrcvinfo, 0, sizeof(*sndrcvinfo));
2264
    sndrcvinfo->sinfo_stream = sinfo->snd_sid;
2265
    sndrcvinfo->sinfo_flags = sinfo->snd_flags;
2266
#   ifdef __FreeBSD__
2267
    sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
2268
#   endif
2269
    sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
2270
    sndrcvinfo->sinfo_context = sinfo->snd_context;
2271
    sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
2272
    msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
2273
#  endif
2274
2275
    ret = sendmsg(b->num, &msg, 0);
2276
2277
    BIO_clear_retry_flags(b);
2278
    if (ret <= 0) {
2279
        if (BIO_dgram_should_retry(ret)) {
2280
            BIO_set_retry_write(b);
2281
            data->dgram._errno = get_last_socket_error();
2282
        }
2283
    }
2284
    return ret;
2285
}
2286
2287
static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
2288
{
2289
    long ret = 1;
2290
    bio_dgram_sctp_data *data = NULL;
2291
    socklen_t sockopt_len = 0;
2292
    struct sctp_authkeyid authkeyid;
2293
    struct sctp_authkey *authkey = NULL;
2294
2295
    data = (bio_dgram_sctp_data *) b->ptr;
2296
2297
    switch (cmd) {
2298
    case BIO_CTRL_DGRAM_QUERY_MTU:
2299
        /*
2300
         * Set to maximum (2^14) and ignore user input to enable transport
2301
         * protocol fragmentation. Returns always 2^14.
2302
         */
2303
        data->dgram.mtu = 16384;
2304
        ret = data->dgram.mtu;
2305
        break;
2306
    case BIO_CTRL_DGRAM_SET_MTU:
2307
        /*
2308
         * Set to maximum (2^14) and ignore input to enable transport
2309
         * protocol fragmentation. Returns always 2^14.
2310
         */
2311
        data->dgram.mtu = 16384;
2312
        ret = data->dgram.mtu;
2313
        break;
2314
    case BIO_CTRL_DGRAM_SET_CONNECTED:
2315
    case BIO_CTRL_DGRAM_CONNECT:
2316
        /* Returns always -1. */
2317
        ret = -1;
2318
        break;
2319
    case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
2320
        /*
2321
         * SCTP doesn't need the DTLS timer Returns always 1.
2322
         */
2323
        break;
2324
    case BIO_CTRL_DGRAM_GET_MTU_OVERHEAD:
2325
        /*
2326
         * We allow transport protocol fragmentation so this is irrelevant
2327
         */
2328
        ret = 0;
2329
        break;
2330
    case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
2331
        if (num > 0)
2332
            data->in_handshake = 1;
2333
        else
2334
            data->in_handshake = 0;
2335
2336
        ret =
2337
            setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY,
2338
                       &data->in_handshake, sizeof(int));
2339
        break;
2340
    case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
2341
        /*
2342
         * New shared key for SCTP AUTH. Returns 0 on success, -1 otherwise.
2343
         */
2344
2345
        /* Get active key */
2346
        sockopt_len = sizeof(struct sctp_authkeyid);
2347
        ret =
2348
            getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
2349
                       &sockopt_len);
2350
        if (ret < 0)
2351
            break;
2352
2353
        /* Add new key */
2354
        sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
2355
        authkey = OPENSSL_malloc(sockopt_len);
2356
        if (authkey == NULL) {
2357
            ret = -1;
2358
            break;
2359
        }
2360
        memset(authkey, 0, sockopt_len);
2361
        authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
2362
#  ifndef __FreeBSD__
2363
        /*
2364
         * This field is missing in FreeBSD 8.2 and earlier, and FreeBSD 8.3
2365
         * and higher work without it.
2366
         */
2367
        authkey->sca_keylength = 64;
2368
#  endif
2369
        memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
2370
2371
        ret =
2372
            setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey,
2373
                       sockopt_len);
2374
        OPENSSL_free(authkey);
2375
        authkey = NULL;
2376
        if (ret < 0)
2377
            break;
2378
2379
        /* Reset active key */
2380
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
2381
                         &authkeyid, sizeof(struct sctp_authkeyid));
2382
        if (ret < 0)
2383
            break;
2384
2385
        break;
2386
    case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
2387
        /* Returns 0 on success, -1 otherwise. */
2388
2389
        /* Get active key */
2390
        sockopt_len = sizeof(struct sctp_authkeyid);
2391
        ret =
2392
            getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid,
2393
                       &sockopt_len);
2394
        if (ret < 0)
2395
            break;
2396
2397
        /* Set active key */
2398
        authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
2399
        ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
2400
                         &authkeyid, sizeof(struct sctp_authkeyid));
2401
        if (ret < 0)
2402
            break;
2403
2404
        /*
2405
         * CCS has been sent, so remember that and fall through to check if
2406
         * we need to deactivate an old key
2407
         */
2408
        data->ccs_sent = 1;
2409
        /* fall-through */
2410
2411
    case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
2412
        /* Returns 0 on success, -1 otherwise. */
2413
2414
        /*
2415
         * Has this command really been called or is this just a
2416
         * fall-through?
2417
         */
2418
        if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
2419
            data->ccs_rcvd = 1;
2420
2421
        /*
2422
         * CSS has been both, received and sent, so deactivate an old key
2423
         */
2424
        if (data->ccs_rcvd == 1 && data->ccs_sent == 1) {
2425
            /* Get active key */
2426
            sockopt_len = sizeof(struct sctp_authkeyid);
2427
            ret =
2428
                getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
2429
                           &authkeyid, &sockopt_len);
2430
            if (ret < 0)
2431
                break;
2432
2433
            /*
2434
             * Deactivate key or delete second last key if
2435
             * SCTP_AUTHENTICATION_EVENT is not available.
2436
             */
2437
            authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
2438
#  ifdef SCTP_AUTH_DEACTIVATE_KEY
2439
            sockopt_len = sizeof(struct sctp_authkeyid);
2440
            ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
2441
                             &authkeyid, sockopt_len);
2442
            if (ret < 0)
2443
                break;
2444
#  endif
2445
#  ifndef SCTP_AUTHENTICATION_EVENT
2446
            if (authkeyid.scact_keynumber > 0) {
2447
                authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
2448
                ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
2449
                                 &authkeyid, sizeof(struct sctp_authkeyid));
2450
                if (ret < 0)
2451
                    break;
2452
            }
2453
#  endif
2454
2455
            data->ccs_rcvd = 0;
2456
            data->ccs_sent = 0;
2457
        }
2458
        break;
2459
    case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
2460
        /* Returns the size of the copied struct. */
2461
        if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
2462
            num = sizeof(struct bio_dgram_sctp_sndinfo);
2463
2464
        memcpy(ptr, &(data->sndinfo), num);
2465
        ret = num;
2466
        break;
2467
    case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
2468
        /* Returns the size of the copied struct. */
2469
        if (num > (long)sizeof(struct bio_dgram_sctp_sndinfo))
2470
            num = sizeof(struct bio_dgram_sctp_sndinfo);
2471
2472
        memcpy(&(data->sndinfo), ptr, num);
2473
        break;
2474
    case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
2475
        /* Returns the size of the copied struct. */
2476
        if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
2477
            num = sizeof(struct bio_dgram_sctp_rcvinfo);
2478
2479
        memcpy(ptr, &data->rcvinfo, num);
2480
2481
        ret = num;
2482
        break;
2483
    case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
2484
        /* Returns the size of the copied struct. */
2485
        if (num > (long)sizeof(struct bio_dgram_sctp_rcvinfo))
2486
            num = sizeof(struct bio_dgram_sctp_rcvinfo);
2487
2488
        memcpy(&(data->rcvinfo), ptr, num);
2489
        break;
2490
    case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
2491
        /* Returns the size of the copied struct. */
2492
        if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
2493
            num = sizeof(struct bio_dgram_sctp_prinfo);
2494
2495
        memcpy(ptr, &(data->prinfo), num);
2496
        ret = num;
2497
        break;
2498
    case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
2499
        /* Returns the size of the copied struct. */
2500
        if (num > (long)sizeof(struct bio_dgram_sctp_prinfo))
2501
            num = sizeof(struct bio_dgram_sctp_prinfo);
2502
2503
        memcpy(&(data->prinfo), ptr, num);
2504
        break;
2505
    case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
2506
        /* Returns always 1. */
2507
        if (num > 0)
2508
            data->save_shutdown = 1;
2509
        else
2510
            data->save_shutdown = 0;
2511
        break;
2512
    case BIO_CTRL_DGRAM_SCTP_WAIT_FOR_DRY:
2513
        return dgram_sctp_wait_for_dry(b);
2514
    case BIO_CTRL_DGRAM_SCTP_MSG_WAITING:
2515
        return dgram_sctp_msg_waiting(b);
2516
2517
    default:
2518
        /*
2519
         * Pass to default ctrl function to process SCTP unspecific commands
2520
         */
2521
        ret = dgram_ctrl(b, cmd, num, ptr);
2522
        break;
2523
    }
2524
    return ret;
2525
}
2526
2527
int BIO_dgram_sctp_notification_cb(BIO *b,
2528
                BIO_dgram_sctp_notification_handler_fn handle_notifications,
2529
                void *context)
2530
{
2531
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
2532
2533
    if (handle_notifications != NULL) {
2534
        data->handle_notifications = handle_notifications;
2535
        data->notification_context = context;
2536
    } else
2537
        return -1;
2538
2539
    return 0;
2540
}
2541
2542
/*
2543
 * BIO_dgram_sctp_wait_for_dry - Wait for SCTP SENDER_DRY event
2544
 * @b: The BIO to check for the dry event
2545
 *
2546
 * Wait until the peer confirms all packets have been received, and so that
2547
 * our kernel doesn't have anything to send anymore.  This is only received by
2548
 * the peer's kernel, not the application.
2549
 *
2550
 * Returns:
2551
 * -1 on error
2552
 *  0 when not dry yet
2553
 *  1 when dry
2554
 */
2555
int BIO_dgram_sctp_wait_for_dry(BIO *b)
2556
{
2557
    return (int)BIO_ctrl(b, BIO_CTRL_DGRAM_SCTP_WAIT_FOR_DRY, 0, NULL);
2558
}
2559
2560
static int dgram_sctp_wait_for_dry(BIO *b)
2561
{
2562
    int is_dry = 0;
2563
    int sockflags = 0;
2564
    int n, ret;
2565
    union sctp_notification snp;
2566
    struct msghdr msg;
2567
    struct iovec iov;
2568
#  ifdef SCTP_EVENT
2569
    struct sctp_event event;
2570
#  else
2571
    struct sctp_event_subscribe event;
2572
    socklen_t eventsize;
2573
#  endif
2574
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
2575
2576
    /* set sender dry event */
2577
#  ifdef SCTP_EVENT
2578
    memset(&event, 0, sizeof(event));
2579
    event.se_assoc_id = 0;
2580
    event.se_type = SCTP_SENDER_DRY_EVENT;
2581
    event.se_on = 1;
2582
    ret =
2583
        setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
2584
                   sizeof(struct sctp_event));
2585
#  else
2586
    eventsize = sizeof(struct sctp_event_subscribe);
2587
    ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
2588
    if (ret < 0)
2589
        return -1;
2590
2591
    event.sctp_sender_dry_event = 1;
2592
2593
    ret =
2594
        setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
2595
                   sizeof(struct sctp_event_subscribe));
2596
#  endif
2597
    if (ret < 0)
2598
        return -1;
2599
2600
    /* peek for notification */
2601
    memset(&snp, 0, sizeof(snp));
2602
    iov.iov_base = (char *)&snp;
2603
    iov.iov_len = sizeof(union sctp_notification);
2604
    msg.msg_name = NULL;
2605
    msg.msg_namelen = 0;
2606
    msg.msg_iov = &iov;
2607
    msg.msg_iovlen = 1;
2608
    msg.msg_control = NULL;
2609
    msg.msg_controllen = 0;
2610
    msg.msg_flags = 0;
2611
2612
    n = recvmsg(b->num, &msg, MSG_PEEK);
2613
    if (n <= 0) {
2614
        if ((n < 0) && (get_last_socket_error() != EAGAIN)
2615
            && (get_last_socket_error() != EWOULDBLOCK))
2616
            return -1;
2617
        else
2618
            return 0;
2619
    }
2620
2621
    /* if we find a notification, process it and try again if necessary */
2622
    while (msg.msg_flags & MSG_NOTIFICATION) {
2623
        memset(&snp, 0, sizeof(snp));
2624
        iov.iov_base = (char *)&snp;
2625
        iov.iov_len = sizeof(union sctp_notification);
2626
        msg.msg_name = NULL;
2627
        msg.msg_namelen = 0;
2628
        msg.msg_iov = &iov;
2629
        msg.msg_iovlen = 1;
2630
        msg.msg_control = NULL;
2631
        msg.msg_controllen = 0;
2632
        msg.msg_flags = 0;
2633
2634
        n = recvmsg(b->num, &msg, 0);
2635
        if (n <= 0) {
2636
            if ((n < 0) && (get_last_socket_error() != EAGAIN)
2637
                && (get_last_socket_error() != EWOULDBLOCK))
2638
                return -1;
2639
            else
2640
                return is_dry;
2641
        }
2642
2643
        if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT) {
2644
            is_dry = 1;
2645
2646
            /* disable sender dry event */
2647
#  ifdef SCTP_EVENT
2648
            memset(&event, 0, sizeof(event));
2649
            event.se_assoc_id = 0;
2650
            event.se_type = SCTP_SENDER_DRY_EVENT;
2651
            event.se_on = 0;
2652
            ret =
2653
                setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event,
2654
                           sizeof(struct sctp_event));
2655
#  else
2656
            eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
2657
            ret =
2658
                getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
2659
                           &eventsize);
2660
            if (ret < 0)
2661
                return -1;
2662
2663
            event.sctp_sender_dry_event = 0;
2664
2665
            ret =
2666
                setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event,
2667
                           sizeof(struct sctp_event_subscribe));
2668
#  endif
2669
            if (ret < 0)
2670
                return -1;
2671
        }
2672
#  ifdef SCTP_AUTHENTICATION_EVENT
2673
        if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
2674
            dgram_sctp_handle_auth_free_key_event(b, &snp);
2675
#  endif
2676
2677
        if (data->handle_notifications != NULL)
2678
            data->handle_notifications(b, data->notification_context,
2679
                                       (void *)&snp);
2680
2681
        /* found notification, peek again */
2682
        memset(&snp, 0, sizeof(snp));
2683
        iov.iov_base = (char *)&snp;
2684
        iov.iov_len = sizeof(union sctp_notification);
2685
        msg.msg_name = NULL;
2686
        msg.msg_namelen = 0;
2687
        msg.msg_iov = &iov;
2688
        msg.msg_iovlen = 1;
2689
        msg.msg_control = NULL;
2690
        msg.msg_controllen = 0;
2691
        msg.msg_flags = 0;
2692
2693
        /* if we have seen the dry already, don't wait */
2694
        if (is_dry) {
2695
            sockflags = fcntl(b->num, F_GETFL, 0);
2696
            fcntl(b->num, F_SETFL, O_NONBLOCK);
2697
        }
2698
2699
        n = recvmsg(b->num, &msg, MSG_PEEK);
2700
2701
        if (is_dry) {
2702
            fcntl(b->num, F_SETFL, sockflags);
2703
        }
2704
2705
        if (n <= 0) {
2706
            if ((n < 0) && (get_last_socket_error() != EAGAIN)
2707
                && (get_last_socket_error() != EWOULDBLOCK))
2708
                return -1;
2709
            else
2710
                return is_dry;
2711
        }
2712
    }
2713
2714
    /* read anything else */
2715
    return is_dry;
2716
}
2717
2718
int BIO_dgram_sctp_msg_waiting(BIO *b)
2719
{
2720
    return (int)BIO_ctrl(b, BIO_CTRL_DGRAM_SCTP_MSG_WAITING, 0, NULL);
2721
}
2722
2723
static int dgram_sctp_msg_waiting(BIO *b)
2724
{
2725
    int n, sockflags;
2726
    union sctp_notification snp;
2727
    struct msghdr msg;
2728
    struct iovec iov;
2729
    bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
2730
2731
    /* Check if there are any messages waiting to be read */
2732
    do {
2733
        memset(&snp, 0, sizeof(snp));
2734
        iov.iov_base = (char *)&snp;
2735
        iov.iov_len = sizeof(union sctp_notification);
2736
        msg.msg_name = NULL;
2737
        msg.msg_namelen = 0;
2738
        msg.msg_iov = &iov;
2739
        msg.msg_iovlen = 1;
2740
        msg.msg_control = NULL;
2741
        msg.msg_controllen = 0;
2742
        msg.msg_flags = 0;
2743
2744
        sockflags = fcntl(b->num, F_GETFL, 0);
2745
        fcntl(b->num, F_SETFL, O_NONBLOCK);
2746
        n = recvmsg(b->num, &msg, MSG_PEEK);
2747
        fcntl(b->num, F_SETFL, sockflags);
2748
2749
        /* if notification, process and try again */
2750
        if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION)) {
2751
#  ifdef SCTP_AUTHENTICATION_EVENT
2752
            if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
2753
                dgram_sctp_handle_auth_free_key_event(b, &snp);
2754
#  endif
2755
2756
            memset(&snp, 0, sizeof(snp));
2757
            iov.iov_base = (char *)&snp;
2758
            iov.iov_len = sizeof(union sctp_notification);
2759
            msg.msg_name = NULL;
2760
            msg.msg_namelen = 0;
2761
            msg.msg_iov = &iov;
2762
            msg.msg_iovlen = 1;
2763
            msg.msg_control = NULL;
2764
            msg.msg_controllen = 0;
2765
            msg.msg_flags = 0;
2766
            n = recvmsg(b->num, &msg, 0);
2767
2768
            if (data->handle_notifications != NULL)
2769
                data->handle_notifications(b, data->notification_context,
2770
                                           (void *)&snp);
2771
        }
2772
2773
    } while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
2774
2775
    /* Return 1 if there is a message to be read, return 0 otherwise. */
2776
    if (n > 0)
2777
        return 1;
2778
    else
2779
        return 0;
2780
}
2781
2782
static int dgram_sctp_puts(BIO *bp, const char *str)
2783
{
2784
    int n, ret;
2785
2786
    n = strlen(str);
2787
    ret = dgram_sctp_write(bp, str, n);
2788
    return ret;
2789
}
2790
# endif
2791
2792
static int BIO_dgram_should_retry(int i)
2793
0
{
2794
0
    int err;
2795
2796
0
    if ((i == 0) || (i == -1)) {
2797
0
        err = get_last_socket_error();
2798
2799
# if defined(OPENSSL_SYS_WINDOWS)
2800
        /*
2801
         * If the socket return value (i) is -1 and err is unexpectedly 0 at
2802
         * this point, the error code was overwritten by another system call
2803
         * before this error handling is called.
2804
         */
2805
# endif
2806
2807
0
        return BIO_dgram_non_fatal_error(err);
2808
0
    }
2809
0
    return 0;
2810
0
}
2811
2812
int BIO_dgram_non_fatal_error(int err)
2813
0
{
2814
0
    switch (err) {
2815
# if defined(OPENSSL_SYS_WINDOWS)
2816
#  if defined(WSAEWOULDBLOCK)
2817
    case WSAEWOULDBLOCK:
2818
#  endif
2819
# endif
2820
2821
0
# ifdef EWOULDBLOCK
2822
#  ifdef WSAEWOULDBLOCK
2823
#   if WSAEWOULDBLOCK != EWOULDBLOCK
2824
    case EWOULDBLOCK:
2825
#   endif
2826
#  else
2827
0
    case EWOULDBLOCK:
2828
0
#  endif
2829
0
# endif
2830
2831
0
# ifdef EINTR
2832
0
    case EINTR:
2833
0
# endif
2834
2835
0
# ifdef EAGAIN
2836
#  if EWOULDBLOCK != EAGAIN
2837
    case EAGAIN:
2838
#  endif
2839
0
# endif
2840
2841
0
# ifdef EPROTO
2842
0
    case EPROTO:
2843
0
# endif
2844
2845
0
# ifdef EINPROGRESS
2846
0
    case EINPROGRESS:
2847
0
# endif
2848
2849
0
# ifdef EALREADY
2850
0
    case EALREADY:
2851
0
# endif
2852
2853
0
        return 1;
2854
0
    default:
2855
0
        break;
2856
0
    }
2857
0
    return 0;
2858
0
}
2859
2860
#endif