1 /* $OpenBSD: bss_null.c,v 1.12 2022/01/07 09:02:17 tb Exp $ */ 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 <errno.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/bio.h> 64 65 #include "bio_local.h" 66 67 static int null_write(BIO *h, const char *buf, int num); 68 static int null_read(BIO *h, char *buf, int size); 69 static int null_puts(BIO *h, const char *str); 70 static int null_gets(BIO *h, char *str, int size); 71 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2); 72 static int null_new(BIO *h); 73 static int null_free(BIO *data); 74 75 static const BIO_METHOD null_method = { 76 .type = BIO_TYPE_NULL, 77 .name = "NULL", 78 .bwrite = null_write, 79 .bread = null_read, 80 .bputs = null_puts, 81 .bgets = null_gets, 82 .ctrl = null_ctrl, 83 .create = null_new, 84 .destroy = null_free 85 }; 86 87 const BIO_METHOD * 88 BIO_s_null(void) 89 { 90 return (&null_method); 91 } 92 93 static int 94 null_new(BIO *bi) 95 { 96 bi->init = 1; 97 bi->num = 0; 98 bi->ptr = (NULL); 99 return (1); 100 } 101 102 static int 103 null_free(BIO *a) 104 { 105 if (a == NULL) 106 return (0); 107 return (1); 108 } 109 110 static int 111 null_read(BIO *b, char *out, int outl) 112 { 113 return (0); 114 } 115 116 static int 117 null_write(BIO *b, const char *in, int inl) 118 { 119 return (inl); 120 } 121 122 static long 123 null_ctrl(BIO *b, int cmd, long num, void *ptr) 124 { 125 long ret = 1; 126 127 switch (cmd) { 128 case BIO_CTRL_RESET: 129 case BIO_CTRL_EOF: 130 case BIO_CTRL_SET: 131 case BIO_CTRL_SET_CLOSE: 132 case BIO_CTRL_FLUSH: 133 case BIO_CTRL_DUP: 134 ret = 1; 135 break; 136 case BIO_CTRL_GET_CLOSE: 137 case BIO_CTRL_INFO: 138 case BIO_CTRL_GET: 139 case BIO_CTRL_PENDING: 140 case BIO_CTRL_WPENDING: 141 default: 142 ret = 0; 143 break; 144 } 145 return (ret); 146 } 147 148 static int 149 null_gets(BIO *bp, char *buf, int size) 150 { 151 return (0); 152 } 153 154 static int 155 null_puts(BIO *bp, const char *str) 156 { 157 if (str == NULL) 158 return (0); 159 return (strlen(str)); 160 } 161