1 /* $OpenBSD: bf_null.c,v 1.12 2018/05/01 13:29:09 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 /* BIO_put and BIO_get both add to the digest, 65 * BIO_gets returns the digest */ 66 67 static int nullf_write(BIO *h, const char *buf, int num); 68 static int nullf_read(BIO *h, char *buf, int size); 69 static int nullf_puts(BIO *h, const char *str); 70 static int nullf_gets(BIO *h, char *str, int size); 71 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2); 72 static int nullf_new(BIO *h); 73 static int nullf_free(BIO *data); 74 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 75 76 static const BIO_METHOD methods_nullf = { 77 .type = BIO_TYPE_NULL_FILTER, 78 .name = "NULL filter", 79 .bwrite = nullf_write, 80 .bread = nullf_read, 81 .bputs = nullf_puts, 82 .bgets = nullf_gets, 83 .ctrl = nullf_ctrl, 84 .create = nullf_new, 85 .destroy = nullf_free, 86 .callback_ctrl = nullf_callback_ctrl 87 }; 88 89 const BIO_METHOD * 90 BIO_f_null(void) 91 { 92 return (&methods_nullf); 93 } 94 95 static int 96 nullf_new(BIO *bi) 97 { 98 bi->init = 1; 99 bi->ptr = NULL; 100 bi->flags = 0; 101 return (1); 102 } 103 104 static int 105 nullf_free(BIO *a) 106 { 107 if (a == NULL) 108 return (0); 109 /* a->ptr=NULL; 110 a->init=0; 111 a->flags=0;*/ 112 return (1); 113 } 114 115 static int 116 nullf_read(BIO *b, char *out, int outl) 117 { 118 int ret = 0; 119 120 if (out == NULL) 121 return (0); 122 if (b->next_bio == NULL) 123 return (0); 124 ret = BIO_read(b->next_bio, out, outl); 125 BIO_clear_retry_flags(b); 126 BIO_copy_next_retry(b); 127 return (ret); 128 } 129 130 static int 131 nullf_write(BIO *b, const char *in, int inl) 132 { 133 int ret = 0; 134 135 if ((in == NULL) || (inl <= 0)) 136 return (0); 137 if (b->next_bio == NULL) 138 return (0); 139 ret = BIO_write(b->next_bio, in, inl); 140 BIO_clear_retry_flags(b); 141 BIO_copy_next_retry(b); 142 return (ret); 143 } 144 145 static long 146 nullf_ctrl(BIO *b, int cmd, long num, void *ptr) 147 { 148 long ret; 149 150 if (b->next_bio == NULL) 151 return (0); 152 switch (cmd) { 153 case BIO_C_DO_STATE_MACHINE: 154 BIO_clear_retry_flags(b); 155 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 156 BIO_copy_next_retry(b); 157 break; 158 case BIO_CTRL_DUP: 159 ret = 0L; 160 break; 161 default: 162 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 163 } 164 return (ret); 165 } 166 167 static long 168 nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 169 { 170 long ret = 1; 171 172 if (b->next_bio == NULL) 173 return (0); 174 switch (cmd) { 175 default: 176 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 177 break; 178 } 179 return (ret); 180 } 181 182 static int 183 nullf_gets(BIO *bp, char *buf, int size) 184 { 185 if (bp->next_bio == NULL) 186 return (0); 187 return (BIO_gets(bp->next_bio, buf, size)); 188 } 189 190 static int 191 nullf_puts(BIO *bp, const char *str) 192 { 193 if (bp->next_bio == NULL) 194 return (0); 195 return (BIO_puts(bp->next_bio, str)); 196 } 197