1 /* $OpenBSD: bf_nbio.c,v 1.22 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 #include <stdlib.h> 62 63 #include <openssl/bio.h> 64 65 #include "bio_local.h" 66 67 /* BIO_put and BIO_get both add to the digest, 68 * BIO_gets returns the digest */ 69 70 static int nbiof_write(BIO *h, const char *buf, int num); 71 static int nbiof_read(BIO *h, char *buf, int size); 72 static int nbiof_puts(BIO *h, const char *str); 73 static int nbiof_gets(BIO *h, char *str, int size); 74 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); 75 static int nbiof_new(BIO *h); 76 static int nbiof_free(BIO *data); 77 static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); 78 79 typedef struct nbio_test_st { 80 /* only set if we sent a 'should retry' error */ 81 int lrn; 82 int lwn; 83 } NBIO_TEST; 84 85 static const BIO_METHOD methods_nbiof = { 86 .type = BIO_TYPE_NBIO_TEST, 87 .name = "non-blocking IO test filter", 88 .bwrite = nbiof_write, 89 .bread = nbiof_read, 90 .bputs = nbiof_puts, 91 .bgets = nbiof_gets, 92 .ctrl = nbiof_ctrl, 93 .create = nbiof_new, 94 .destroy = nbiof_free, 95 .callback_ctrl = nbiof_callback_ctrl 96 }; 97 98 const BIO_METHOD * 99 BIO_f_nbio_test(void) 100 { 101 return (&methods_nbiof); 102 } 103 104 static int 105 nbiof_new(BIO *bi) 106 { 107 NBIO_TEST *nt; 108 109 if (!(nt = malloc(sizeof(NBIO_TEST)))) 110 return (0); 111 nt->lrn = -1; 112 nt->lwn = -1; 113 bi->ptr = (char *)nt; 114 bi->init = 1; 115 bi->flags = 0; 116 return (1); 117 } 118 119 static int 120 nbiof_free(BIO *a) 121 { 122 if (a == NULL) 123 return (0); 124 free(a->ptr); 125 a->ptr = NULL; 126 a->init = 0; 127 a->flags = 0; 128 return (1); 129 } 130 131 static int 132 nbiof_read(BIO *b, char *out, int outl) 133 { 134 int ret = 0; 135 int num; 136 unsigned char n; 137 138 if (out == NULL) 139 return (0); 140 if (b->next_bio == NULL) 141 return (0); 142 143 BIO_clear_retry_flags(b); 144 145 arc4random_buf(&n, 1); 146 num = (n & 0x07); 147 148 if (outl > num) 149 outl = num; 150 151 if (num == 0) { 152 ret = -1; 153 BIO_set_retry_read(b); 154 } else { 155 ret = BIO_read(b->next_bio, out, outl); 156 if (ret < 0) 157 BIO_copy_next_retry(b); 158 } 159 return (ret); 160 } 161 162 static int 163 nbiof_write(BIO *b, const char *in, int inl) 164 { 165 NBIO_TEST *nt; 166 int ret = 0; 167 int num; 168 unsigned char n; 169 170 if ((in == NULL) || (inl <= 0)) 171 return (0); 172 if (b->next_bio == NULL) 173 return (0); 174 nt = (NBIO_TEST *)b->ptr; 175 176 BIO_clear_retry_flags(b); 177 178 if (nt->lwn > 0) { 179 num = nt->lwn; 180 nt->lwn = 0; 181 } else { 182 arc4random_buf(&n, 1); 183 num = (n&7); 184 } 185 186 if (inl > num) 187 inl = num; 188 189 if (num == 0) { 190 ret = -1; 191 BIO_set_retry_write(b); 192 } else { 193 ret = BIO_write(b->next_bio, in, inl); 194 if (ret < 0) { 195 BIO_copy_next_retry(b); 196 nt->lwn = inl; 197 } 198 } 199 return (ret); 200 } 201 202 static long 203 nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) 204 { 205 long ret; 206 207 if (b->next_bio == NULL) 208 return (0); 209 switch (cmd) { 210 case BIO_C_DO_STATE_MACHINE: 211 BIO_clear_retry_flags(b); 212 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 213 BIO_copy_next_retry(b); 214 break; 215 case BIO_CTRL_DUP: 216 ret = 0L; 217 break; 218 default: 219 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 220 break; 221 } 222 return (ret); 223 } 224 225 static long 226 nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 227 { 228 long ret = 1; 229 230 if (b->next_bio == NULL) 231 return (0); 232 switch (cmd) { 233 default: 234 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 235 break; 236 } 237 return (ret); 238 } 239 240 static int 241 nbiof_gets(BIO *bp, char *buf, int size) 242 { 243 if (bp->next_bio == NULL) 244 return (0); 245 return (BIO_gets(bp->next_bio, buf, size)); 246 } 247 248 static int 249 nbiof_puts(BIO *bp, const char *str) 250 { 251 if (bp->next_bio == NULL) 252 return (0); 253 return (BIO_puts(bp->next_bio, str)); 254 } 255