1 /* crypto/bio/bf_null.c */ 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 <stdio.h> 60 #include <errno.h> 61 #include "cryptlib.h" 62 #include <openssl/bio.h> 63 #include <openssl/evp.h> 64 65 /* BIO_put and BIO_get both add to the digest, 66 * BIO_gets returns the digest */ 67 68 static int nullf_write(BIO *h, const char *buf, int num); 69 static int nullf_read(BIO *h, char *buf, int size); 70 static int nullf_puts(BIO *h, const char *str); 71 static int nullf_gets(BIO *h, char *str, int size); 72 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2); 73 static int nullf_new(BIO *h); 74 static int nullf_free(BIO *data); 75 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 76 static BIO_METHOD methods_nullf= 77 { 78 BIO_TYPE_NULL_FILTER, 79 "NULL filter", 80 nullf_write, 81 nullf_read, 82 nullf_puts, 83 nullf_gets, 84 nullf_ctrl, 85 nullf_new, 86 nullf_free, 87 nullf_callback_ctrl, 88 }; 89 90 BIO_METHOD *BIO_f_null(void) 91 { 92 return(&methods_nullf); 93 } 94 95 static int nullf_new(BIO *bi) 96 { 97 bi->init=1; 98 bi->ptr=NULL; 99 bi->flags=0; 100 return(1); 101 } 102 103 static int nullf_free(BIO *a) 104 { 105 if (a == NULL) return(0); 106 /* a->ptr=NULL; 107 a->init=0; 108 a->flags=0;*/ 109 return(1); 110 } 111 112 static int nullf_read(BIO *b, char *out, int outl) 113 { 114 int ret=0; 115 116 if (out == NULL) return(0); 117 if (b->next_bio == NULL) return(0); 118 ret=BIO_read(b->next_bio,out,outl); 119 BIO_clear_retry_flags(b); 120 BIO_copy_next_retry(b); 121 return(ret); 122 } 123 124 static int nullf_write(BIO *b, const char *in, int inl) 125 { 126 int ret=0; 127 128 if ((in == NULL) || (inl <= 0)) return(0); 129 if (b->next_bio == NULL) return(0); 130 ret=BIO_write(b->next_bio,in,inl); 131 BIO_clear_retry_flags(b); 132 BIO_copy_next_retry(b); 133 return(ret); 134 } 135 136 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr) 137 { 138 long ret; 139 140 if (b->next_bio == NULL) return(0); 141 switch(cmd) 142 { 143 case BIO_C_DO_STATE_MACHINE: 144 BIO_clear_retry_flags(b); 145 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 146 BIO_copy_next_retry(b); 147 break; 148 case BIO_CTRL_DUP: 149 ret=0L; 150 break; 151 default: 152 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 153 } 154 return(ret); 155 } 156 157 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 158 { 159 long ret=1; 160 161 if (b->next_bio == NULL) return(0); 162 switch (cmd) 163 { 164 default: 165 ret=BIO_callback_ctrl(b->next_bio,cmd,fp); 166 break; 167 } 168 return(ret); 169 } 170 171 static int nullf_gets(BIO *bp, char *buf, int size) 172 { 173 if (bp->next_bio == NULL) return(0); 174 return(BIO_gets(bp->next_bio,buf,size)); 175 } 176 177 178 static int nullf_puts(BIO *bp, const char *str) 179 { 180 if (bp->next_bio == NULL) return(0); 181 return(BIO_puts(bp->next_bio,str)); 182 } 183 184 185