1/* crypto/bio/bss_sock.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.] */
57
58#include <openssl/bio.h>
59
60#include <fcntl.h>
61
62#if !defined(OPENSSL_WINDOWS)
63#include <unistd.h>
64#endif
65
66#include "internal.h"
67
68
69static int sock_new(BIO *bio) {
70  bio->init = 0;
71  bio->num = 0;
72  bio->ptr = NULL;
73  bio->flags = 0;
74  return 1;
75}
76
77static int sock_free(BIO *bio) {
78  if (bio == NULL) {
79    return 0;
80  }
81
82  if (bio->shutdown) {
83    if (bio->init) {
84      close(bio->num);
85    }
86    bio->init = 0;
87    bio->flags = 0;
88  }
89  return 1;
90}
91
92static int sock_read(BIO *b, char *out, int outl) {
93  int ret = 0;
94
95  if (out == NULL) {
96    return 0;
97  }
98
99  bio_clear_socket_error();
100  ret = recv(b->num, out, outl, 0);
101  BIO_clear_retry_flags(b);
102  if (ret <= 0) {
103    if (bio_fd_should_retry(ret)) {
104      BIO_set_retry_read(b);
105    }
106  }
107  return ret;
108}
109
110static int sock_write(BIO *b, const char *in, int inl) {
111  int ret;
112
113  bio_clear_socket_error();
114  ret = send(b->num, in, inl, 0);
115  BIO_clear_retry_flags(b);
116  if (ret <= 0) {
117    if (bio_fd_should_retry(ret)) {
118      BIO_set_retry_write(b);
119    }
120  }
121  return ret;
122}
123
124static int sock_puts(BIO *bp, const char *str) {
125  return sock_write(bp, str, strlen(str));
126}
127
128static long sock_ctrl(BIO *b, int cmd, long num, void *ptr) {
129  long ret = 1;
130  int *ip;
131
132  switch (cmd) {
133    case BIO_C_SET_FD:
134      sock_free(b);
135      b->num = *((int *)ptr);
136      b->shutdown = (int)num;
137      b->init = 1;
138      break;
139    case BIO_C_GET_FD:
140      if (b->init) {
141        ip = (int *)ptr;
142        if (ip != NULL)
143          *ip = b->num;
144        ret = b->num;
145      } else
146        ret = -1;
147      break;
148    case BIO_CTRL_GET_CLOSE:
149      ret = b->shutdown;
150      break;
151    case BIO_CTRL_SET_CLOSE:
152      b->shutdown = (int)num;
153      break;
154    case BIO_CTRL_FLUSH:
155      ret = 1;
156      break;
157    default:
158      ret = 0;
159      break;
160  }
161  return ret;
162}
163
164static const BIO_METHOD methods_sockp = {
165    BIO_TYPE_SOCKET,  "socket",  sock_write, sock_read, sock_puts,
166    NULL /* gets, */, sock_ctrl, sock_new,   sock_free, NULL,
167};
168
169const BIO_METHOD *BIO_s_socket(void) { return &methods_sockp; }
170
171BIO *BIO_new_socket(int fd, int close_flag) {
172  BIO *ret;
173
174  ret = BIO_new(BIO_s_socket());
175  if (ret == NULL) {
176    return NULL;
177  }
178  BIO_set_fd(ret, fd, close_flag);
179  return ret;
180}
181