252 lines
6.4 KiB
C
Executable file
252 lines
6.4 KiB
C
Executable file
/* $OpenBSD: bf_nbio.c,v 1.20 2018/05/01 13:29:09 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <openssl/bio.h>
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/* BIO_put and BIO_get both add to the digest,
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* BIO_gets returns the digest */
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static int nbiof_write(BIO *h, const char *buf, int num);
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static int nbiof_read(BIO *h, char *buf, int size);
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static int nbiof_puts(BIO *h, const char *str);
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static int nbiof_gets(BIO *h, char *str, int size);
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static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int nbiof_new(BIO *h);
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static int nbiof_free(BIO *data);
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static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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typedef struct nbio_test_st {
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/* only set if we sent a 'should retry' error */
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int lrn;
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int lwn;
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} NBIO_TEST;
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static const BIO_METHOD methods_nbiof = {
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.type = BIO_TYPE_NBIO_TEST,
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.name = "non-blocking IO test filter",
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.bwrite = nbiof_write,
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.bread = nbiof_read,
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.bputs = nbiof_puts,
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.bgets = nbiof_gets,
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.ctrl = nbiof_ctrl,
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.create = nbiof_new,
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.destroy = nbiof_free,
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.callback_ctrl = nbiof_callback_ctrl
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};
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const BIO_METHOD *
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BIO_f_nbio_test(void)
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{
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return (&methods_nbiof);
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}
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static int
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nbiof_new(BIO *bi)
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{
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NBIO_TEST *nt;
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if (!(nt = malloc(sizeof(NBIO_TEST))))
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return (0);
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nt->lrn = -1;
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nt->lwn = -1;
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bi->ptr = (char *)nt;
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bi->init = 1;
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bi->flags = 0;
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return (1);
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}
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static int
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nbiof_free(BIO *a)
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{
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if (a == NULL)
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return (0);
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free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return (1);
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}
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static int
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nbiof_read(BIO *b, char *out, int outl)
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{
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int ret = 0;
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int num;
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unsigned char n;
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if (out == NULL)
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return (0);
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if (b->next_bio == NULL)
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return (0);
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BIO_clear_retry_flags(b);
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arc4random_buf(&n, 1);
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num = (n & 0x07);
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if (outl > num)
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outl = num;
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if (num == 0) {
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ret = -1;
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BIO_set_retry_read(b);
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} else {
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ret = BIO_read(b->next_bio, out, outl);
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if (ret < 0)
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BIO_copy_next_retry(b);
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}
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return (ret);
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}
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static int
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nbiof_write(BIO *b, const char *in, int inl)
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{
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NBIO_TEST *nt;
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int ret = 0;
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int num;
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unsigned char n;
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if ((in == NULL) || (inl <= 0))
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return (0);
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if (b->next_bio == NULL)
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return (0);
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nt = (NBIO_TEST *)b->ptr;
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BIO_clear_retry_flags(b);
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if (nt->lwn > 0) {
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num = nt->lwn;
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nt->lwn = 0;
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} else {
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arc4random_buf(&n, 1);
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num = (n&7);
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}
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if (inl > num)
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inl = num;
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if (num == 0) {
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ret = -1;
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BIO_set_retry_write(b);
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} else {
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ret = BIO_write(b->next_bio, in, inl);
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if (ret < 0) {
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BIO_copy_next_retry(b);
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nt->lwn = inl;
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}
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}
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return (ret);
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}
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static long
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nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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long ret;
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if (b->next_bio == NULL)
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return (0);
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switch (cmd) {
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_CTRL_DUP:
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ret = 0L;
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break;
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default:
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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}
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return (ret);
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}
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static long
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nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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{
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long ret = 1;
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if (b->next_bio == NULL)
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return (0);
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switch (cmd) {
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default:
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ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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break;
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}
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return (ret);
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}
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static int
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nbiof_gets(BIO *bp, char *buf, int size)
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{
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if (bp->next_bio == NULL)
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return (0);
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return (BIO_gets(bp->next_bio, buf, size));
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}
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static int
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nbiof_puts(BIO *bp, const char *str)
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{
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if (bp->next_bio == NULL)
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return (0);
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return (BIO_puts(bp->next_bio, str));
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}
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