1 /* crypto/bio/bf_nbio.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 #include <openssl/rand.h>
63 #include <openssl/bio.h>
66 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
69 static int nbiof_write(BIO *h, const char *buf, int num);
70 static int nbiof_read(BIO *h, char *buf, int size);
71 static int nbiof_puts(BIO *h, const char *str);
72 static int nbiof_gets(BIO *h, char *str, int size);
73 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
74 static int nbiof_new(BIO *h);
75 static int nbiof_free(BIO *data);
76 static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
77 typedef struct nbio_test_st {
78 /* only set if we sent a 'should retry' error */
83 static BIO_METHOD methods_nbiof = {
85 "non-blocking IO test filter",
96 BIO_METHOD *BIO_f_nbio_test(void)
98 return (&methods_nbiof);
101 static int nbiof_new(BIO *bi)
105 if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST))))
109 bi->ptr = (char *)nt;
115 static int nbiof_free(BIO *a)
120 OPENSSL_free(a->ptr);
127 static int nbiof_read(BIO *b, char *out, int outl)
137 if (b->next_bio == NULL)
140 BIO_clear_retry_flags(b);
142 if (RAND_bytes(&n, 1) <= 0)
151 BIO_set_retry_read(b);
155 ret = BIO_read(b->next_bio, out, outl);
157 BIO_copy_next_retry(b);
162 static int nbiof_write(BIO *b, const char *in, int inl)
169 if ((in == NULL) || (inl <= 0))
171 if (b->next_bio == NULL)
173 nt = (NBIO_TEST *)b->ptr;
175 BIO_clear_retry_flags(b);
182 if (RAND_bytes(&n, 1) <= 0)
192 BIO_set_retry_write(b);
196 ret = BIO_write(b->next_bio, in, inl);
198 BIO_copy_next_retry(b);
205 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
209 if (b->next_bio == NULL)
212 case BIO_C_DO_STATE_MACHINE:
213 BIO_clear_retry_flags(b);
214 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
215 BIO_copy_next_retry(b);
221 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
227 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
231 if (b->next_bio == NULL)
235 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
241 static int nbiof_gets(BIO *bp, char *buf, int size)
243 if (bp->next_bio == NULL)
245 return (BIO_gets(bp->next_bio, buf, size));
248 static int nbiof_puts(BIO *bp, const char *str)
250 if (bp->next_bio == NULL)
252 return (BIO_puts(bp->next_bio, str));