1/* crypto/bio/bf_null.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 59#include <stdio.h> 60#include <errno.h> 61#include "cryptlib.h" 62#include <openssl/bio.h> 63 64/* 65 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest 66 */ 67 68static int nullf_write(BIO *h, const char *buf, int num); 69static int nullf_read(BIO *h, char *buf, int size); 70static int nullf_puts(BIO *h, const char *str); 71static int nullf_gets(BIO *h, char *str, int size); 72static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2); 73static int nullf_new(BIO *h); 74static int nullf_free(BIO *data); 75static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 76static BIO_METHOD methods_nullf = { 77 BIO_TYPE_NULL_FILTER, 78 "NULL filter", 79 nullf_write, 80 nullf_read, 81 nullf_puts, 82 nullf_gets, 83 nullf_ctrl, 84 nullf_new, 85 nullf_free, 86 nullf_callback_ctrl, 87}; 88 89BIO_METHOD *BIO_f_null(void) 90{ 91 return (&methods_nullf); 92} 93 94static int nullf_new(BIO *bi) 95{ 96 bi->init = 1; 97 bi->ptr = NULL; 98 bi->flags = 0; 99 return (1); 100} 101 102static int nullf_free(BIO *a) 103{ 104 if (a == NULL) 105 return (0); 106 /*- 107 a->ptr=NULL; 108 a->init=0; 109 a->flags=0; 110 */ 111 return (1); 112} 113 114static int nullf_read(BIO *b, char *out, int outl) 115{ 116 int ret = 0; 117 118 if (out == NULL) 119 return (0); 120 if (b->next_bio == NULL) 121 return (0); 122 ret = BIO_read(b->next_bio, out, outl); 123 BIO_clear_retry_flags(b); 124 BIO_copy_next_retry(b); 125 return (ret); 126} 127 128static int nullf_write(BIO *b, const char *in, int inl) 129{ 130 int ret = 0; 131 132 if ((in == NULL) || (inl <= 0)) 133 return (0); 134 if (b->next_bio == NULL) 135 return (0); 136 ret = BIO_write(b->next_bio, in, inl); 137 BIO_clear_retry_flags(b); 138 BIO_copy_next_retry(b); 139 return (ret); 140} 141 142static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr) 143{ 144 long ret; 145 146 if (b->next_bio == NULL) 147 return (0); 148 switch (cmd) { 149 case BIO_C_DO_STATE_MACHINE: 150 BIO_clear_retry_flags(b); 151 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 152 BIO_copy_next_retry(b); 153 break; 154 case BIO_CTRL_DUP: 155 ret = 0L; 156 break; 157 default: 158 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 159 } 160 return (ret); 161} 162 163static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 164{ 165 long ret = 1; 166 167 if (b->next_bio == NULL) 168 return (0); 169 switch (cmd) { 170 default: 171 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 172 break; 173 } 174 return (ret); 175} 176 177static int nullf_gets(BIO *bp, char *buf, int size) 178{ 179 if (bp->next_bio == NULL) 180 return (0); 181 return (BIO_gets(bp->next_bio, buf, size)); 182} 183 184static int nullf_puts(BIO *bp, const char *str) 185{ 186 if (bp->next_bio == NULL) 187 return (0); 188 return (BIO_puts(bp->next_bio, str)); 189} 190