summaryrefslogtreecommitdiff
path: root/librabbitmq/amqp_openssl_bio.c
blob: b0f4aad574882d9adb7aae03b4e64de6fe561ae3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * Portions created by Alan Antonuk are Copyright (c) 2017 Alan Antonuk.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "amqp_openssl_bio.h"
#include "amqp_socket.h"

#include <assert.h>
#include <errno.h>
#if ((defined(_WIN32)) || (defined(__MINGW32__)) || (defined(__MINGW64__)))
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <winsock2.h>
#else
#include <sys/socket.h>
#include <sys/types.h>
#endif

#ifdef MSG_NOSIGNAL
#define AMQP_USE_AMQP_BIO
#endif

static int amqp_ssl_bio_initialized = 0;

#ifdef AMQP_USE_AMQP_BIO
static BIO_METHOD amqp_bio_method;

static int amqp_openssl_bio_should_retry(int res) {
  if (res == -1) {
    int err = amqp_os_socket_error();
    if (
#ifdef EWOULDBLOCK
        err == EWOULDBLOCK ||
#endif
#ifdef WSAEWOULDBLOCK
        err == WSAEWOULDBLOCK ||
#endif
#ifdef ENOTCONN
        err == ENOTCONN ||
#endif
#ifdef EINTR
        err == EINTR ||
#endif
#ifdef EAGAIN
        err == EAGAIN ||
#endif
#ifdef EPROTO
        err == EPROTO ||
#endif
#ifdef EINPROGRESS
        err == EINPROGRESS ||
#endif
#ifdef EALREADY
        err == EALREADY ||
#endif
        0) {
      return 1;
    }
  }
  return 0;
}

static int amqp_openssl_bio_write(BIO *b, const char *in, int inl) {
  int flags = 0;
  int fd;
  int res;

#ifdef MSG_NOSIGNAL
  flags |= MSG_NOSIGNAL;
#endif

  BIO_get_fd(b, &fd);
  res = send(fd, in, inl, flags);

  BIO_clear_retry_flags(b);
  if (res <= 0 && amqp_openssl_bio_should_retry(res)) {
    BIO_set_retry_write(b);
  }

  return res;
}

static int amqp_openssl_bio_read(BIO *b, char *out, int outl) {
  int flags = 0;
  int fd;
  int res;

#ifdef MSG_NOSIGNAL
  flags |= MSG_NOSIGNAL;
#endif

  BIO_get_fd(b, &fd);
  res = recv(fd, out, outl, flags);

  BIO_clear_retry_flags(b);
  if (res <= 0 && amqp_openssl_bio_should_retry(res)) {
    BIO_set_retry_read(b);
  }

  return res;
}

#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
static int BIO_meth_set_write(BIO_METHOD *biom,
                              int (*wfn)(BIO *, const char *, int)) {
  biom->bwrite = wfn;
  return 0;
}

static int BIO_meth_set_read(BIO_METHOD *biom, int (*rfn)(BIO *, char *, int)) {
  biom->bread = rfn;
  return 0;
}
#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
#endif /* AMQP_USE_AMQP_BIO */

void amqp_openssl_bio_init(void) {
  assert(!amqp_ssl_bio_initialized);
#ifdef AMQP_USE_AMQP_BIO
  memcpy(&amqp_bio_method, BIO_s_socket(), sizeof(amqp_bio_method));
  BIO_meth_set_write(&amqp_bio_method, amqp_openssl_bio_write);
  BIO_meth_set_read(&amqp_bio_method, amqp_openssl_bio_read);
#endif

  amqp_ssl_bio_initialized = 1;
}

BIO_METHOD *amqp_openssl_bio(void) {
  assert(amqp_ssl_bio_initialized);
#ifdef AMQP_USE_AMQP_BIO
  return &amqp_bio_method;
#else
  return BIO_s_socket();
#endif
}