1 /* $OpenBSD: bss_null.c,v 1.9 2014/07/10 13:58:22 jsing 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 "cryptlib.h" 64 #include <openssl/bio.h> 65 66 static int null_write(BIO *h, const char *buf, int num); 67 static int null_read(BIO *h, char *buf, int size); 68 static int null_puts(BIO *h, const char *str); 69 static int null_gets(BIO *h, char *str, int size); 70 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2); 71 static int null_new(BIO *h); 72 static int null_free(BIO *data); 73 74 static BIO_METHOD null_method = { 75 .type = BIO_TYPE_NULL, 76 .name = "NULL", 77 .bwrite = null_write, 78 .bread = null_read, 79 .bputs = null_puts, 80 .bgets = null_gets, 81 .ctrl = null_ctrl, 82 .create = null_new, 83 .destroy = null_free 84 }; 85 86 BIO_METHOD * 87 BIO_s_null(void) 88 { 89 return (&null_method); 90 } 91 92 static int 93 null_new(BIO *bi) 94 { 95 bi->init = 1; 96 bi->num = 0; 97 bi->ptr = (NULL); 98 return (1); 99 } 100 101 static int 102 null_free(BIO *a) 103 { 104 if (a == NULL) 105 return (0); 106 return (1); 107 } 108 109 static int 110 null_read(BIO *b, char *out, int outl) 111 { 112 return (0); 113 } 114 115 static int 116 null_write(BIO *b, const char *in, int inl) 117 { 118 return (inl); 119 } 120 121 static long 122 null_ctrl(BIO *b, int cmd, long num, void *ptr) 123 { 124 long ret = 1; 125 126 switch (cmd) { 127 case BIO_CTRL_RESET: 128 case BIO_CTRL_EOF: 129 case BIO_CTRL_SET: 130 case BIO_CTRL_SET_CLOSE: 131 case BIO_CTRL_FLUSH: 132 case BIO_CTRL_DUP: 133 ret = 1; 134 break; 135 case BIO_CTRL_GET_CLOSE: 136 case BIO_CTRL_INFO: 137 case BIO_CTRL_GET: 138 case BIO_CTRL_PENDING: 139 case BIO_CTRL_WPENDING: 140 default: 141 ret = 0; 142 break; 143 } 144 return (ret); 145 } 146 147 static int 148 null_gets(BIO *bp, char *buf, int size) 149 { 150 return (0); 151 } 152 153 static int 154 null_puts(BIO *bp, const char *str) 155 { 156 if (str == NULL) 157 return (0); 158 return (strlen(str)); 159 } 160