IABSD.fr/src/lib/libcrypto/bio/bss_null.c

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• Author : tb
  Date : 2018-05-01 13:29:09
  Hash : 6dc76777
  Message : const for BIO_{new,set}() and most of the BIO_{f,s}_*() family of functions. ok beck, jsing

• lib/libcrypto/bio/bss_null.c

• /* $OpenBSD: bss_null.c,v 1.11 2018/05/01 13:29:10 tb Exp $ */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   * 
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   * 
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from 
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   * 
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * 
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.]
   */
  
  #include <errno.h>
  #include <stdio.h>
  #include <string.h>
  
  #include <openssl/bio.h>
  
  static int null_write(BIO *h, const char *buf, int num);
  static int null_read(BIO *h, char *buf, int size);
  static int null_puts(BIO *h, const char *str);
  static int null_gets(BIO *h, char *str, int size);
  static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  static int null_new(BIO *h);
  static int null_free(BIO *data);
  
  static const BIO_METHOD null_method = {
  	.type = BIO_TYPE_NULL,
  	.name = "NULL",
  	.bwrite = null_write,
  	.bread = null_read,
  	.bputs = null_puts,
  	.bgets = null_gets,
  	.ctrl = null_ctrl,
  	.create = null_new,
  	.destroy = null_free
  };
  
  const BIO_METHOD *
  BIO_s_null(void)
  {
  	return (&null_method);
  }
  
  static int
  null_new(BIO *bi)
  {
  	bi->init = 1;
  	bi->num = 0;
  	bi->ptr = (NULL);
  	return (1);
  }
  
  static int
  null_free(BIO *a)
  {
  	if (a == NULL)
  		return (0);
  	return (1);
  }
  
  static int
  null_read(BIO *b, char *out, int outl)
  {
  	return (0);
  }
  
  static int
  null_write(BIO *b, const char *in, int inl)
  {
  	return (inl);
  }
  
  static long
  null_ctrl(BIO *b, int cmd, long num, void *ptr)
  {
  	long ret = 1;
  
  	switch (cmd) {
  	case BIO_CTRL_RESET:
  	case BIO_CTRL_EOF:
  	case BIO_CTRL_SET:
  	case BIO_CTRL_SET_CLOSE:
  	case BIO_CTRL_FLUSH:
  	case BIO_CTRL_DUP:
  		ret = 1;
  		break;
  	case BIO_CTRL_GET_CLOSE:
  	case BIO_CTRL_INFO:
  	case BIO_CTRL_GET:
  	case BIO_CTRL_PENDING:
  	case BIO_CTRL_WPENDING:
  	default:
  		ret = 0;
  		break;
  	}
  	return (ret);
  }
  
  static int
  null_gets(BIO *bp, char *buf, int size)
  {
  	return (0);
  }
  
  static int
  null_puts(BIO *bp, const char *str)
  {
  	if (str == NULL)
  		return (0);
  	return (strlen(str));
  }