1 /* $OpenBSD: bf_null.c,v 1.14 2022/01/14 08:40:57 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 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 97 static int 98 nullf_new(BIO *bi) 99 { 100 bi->init = 1; 101 bi->ptr = NULL; 102 bi->flags = 0; 103 return (1); 104 } 105 106 static int 107 nullf_free(BIO *a) 108 { 109 if (a == NULL) 110 return (0); 111 /* a->ptr=NULL; 112 a->init=0; 113 a->flags=0;*/ 114 return (1); 115 } 116 117 static int 118 nullf_read(BIO *b, char *out, int outl) 119 { 120 int ret = 0; 121 122 if (out == NULL) 123 return (0); 124 if (b->next_bio == NULL) 125 return (0); 126 ret = BIO_read(b->next_bio, out, outl); 127 BIO_clear_retry_flags(b); 128 BIO_copy_next_retry(b); 129 return (ret); 130 } 131 132 static int 133 nullf_write(BIO *b, const char *in, int inl) 134 { 135 int ret = 0; 136 137 if ((in == NULL) || (inl <= 0)) 138 return (0); 139 if (b->next_bio == NULL) 140 return (0); 141 ret = BIO_write(b->next_bio, in, inl); 142 BIO_clear_retry_flags(b); 143 BIO_copy_next_retry(b); 144 return (ret); 145 } 146 147 static long 148 nullf_ctrl(BIO *b, int cmd, long num, void *ptr) 149 { 150 long ret; 151 152 if (b->next_bio == NULL) 153 return (0); 154 switch (cmd) { 155 case BIO_C_DO_STATE_MACHINE: 156 BIO_clear_retry_flags(b); 157 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 158 BIO_copy_next_retry(b); 159 break; 160 case BIO_CTRL_DUP: 161 ret = 0L; 162 break; 163 default: 164 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 165 } 166 return (ret); 167 } 168 169 static long 170 nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 171 { 172 long ret = 1; 173 174 if (b->next_bio == NULL) 175 return (0); 176 switch (cmd) { 177 default: 178 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 179 break; 180 } 181 return (ret); 182 } 183 184 static int 185 nullf_gets(BIO *bp, char *buf, int size) 186 { 187 if (bp->next_bio == NULL) 188 return (0); 189 return (BIO_gets(bp->next_bio, buf, size)); 190 } 191 192 static int 193 nullf_puts(BIO *bp, const char *str) 194 { 195 if (bp->next_bio == NULL) 196 return (0); 197 return (BIO_puts(bp->next_bio, str)); 198 } 199