1 /* $OpenBSD: bf_null.c,v 1.15 2023/07/05 21:23:37 beck 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 62 #include <openssl/bio.h> 63 64 #include "bio_local.h" 65 66 /* BIO_put and BIO_get both add to the digest, 67 * BIO_gets returns the digest */ 68 69 static int nullf_write(BIO *h, const char *buf, int num); 70 static int nullf_read(BIO *h, char *buf, int size); 71 static int nullf_puts(BIO *h, const char *str); 72 static int nullf_gets(BIO *h, char *str, int size); 73 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2); 74 static int nullf_new(BIO *h); 75 static int nullf_free(BIO *data); 76 static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); 77 78 static const BIO_METHOD methods_nullf = { 79 .type = BIO_TYPE_NULL_FILTER, 80 .name = "NULL filter", 81 .bwrite = nullf_write, 82 .bread = nullf_read, 83 .bputs = nullf_puts, 84 .bgets = nullf_gets, 85 .ctrl = nullf_ctrl, 86 .create = nullf_new, 87 .destroy = nullf_free, 88 .callback_ctrl = nullf_callback_ctrl 89 }; 90 91 const BIO_METHOD * 92 BIO_f_null(void) 93 { 94 return (&methods_nullf); 95 } 96 LCRYPTO_ALIAS(BIO_f_null); 97 98 static int 99 nullf_new(BIO *bi) 100 { 101 bi->init = 1; 102 bi->ptr = NULL; 103 bi->flags = 0; 104 return (1); 105 } 106 107 static int 108 nullf_free(BIO *a) 109 { 110 if (a == NULL) 111 return (0); 112 /* a->ptr=NULL; 113 a->init=0; 114 a->flags=0;*/ 115 return (1); 116 } 117 118 static int 119 nullf_read(BIO *b, char *out, int outl) 120 { 121 int ret = 0; 122 123 if (out == NULL) 124 return (0); 125 if (b->next_bio == NULL) 126 return (0); 127 ret = BIO_read(b->next_bio, out, outl); 128 BIO_clear_retry_flags(b); 129 BIO_copy_next_retry(b); 130 return (ret); 131 } 132 133 static int 134 nullf_write(BIO *b, const char *in, int inl) 135 { 136 int ret = 0; 137 138 if ((in == NULL) || (inl <= 0)) 139 return (0); 140 if (b->next_bio == NULL) 141 return (0); 142 ret = BIO_write(b->next_bio, in, inl); 143 BIO_clear_retry_flags(b); 144 BIO_copy_next_retry(b); 145 return (ret); 146 } 147 148 static long 149 nullf_ctrl(BIO *b, int cmd, long num, void *ptr) 150 { 151 long ret; 152 153 if (b->next_bio == NULL) 154 return (0); 155 switch (cmd) { 156 case BIO_C_DO_STATE_MACHINE: 157 BIO_clear_retry_flags(b); 158 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 159 BIO_copy_next_retry(b); 160 break; 161 case BIO_CTRL_DUP: 162 ret = 0L; 163 break; 164 default: 165 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 166 } 167 return (ret); 168 } 169 170 static long 171 nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 172 { 173 long ret = 1; 174 175 if (b->next_bio == NULL) 176 return (0); 177 switch (cmd) { 178 default: 179 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 180 break; 181 } 182 return (ret); 183 } 184 185 static int 186 nullf_gets(BIO *bp, char *buf, int size) 187 { 188 if (bp->next_bio == NULL) 189 return (0); 190 return (BIO_gets(bp->next_bio, buf, size)); 191 } 192 193 static int 194 nullf_puts(BIO *bp, const char *str) 195 { 196 if (bp->next_bio == NULL) 197 return (0); 198 return (BIO_puts(bp->next_bio, str)); 199 } 200