1 /* $OpenBSD: bf_nbio.c,v 1.18 2014/10/22 13:02:03 jsing 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 /* BIO_put and BIO_get both add to the digest, 66 * BIO_gets returns the digest */ 67 68 static int nbiof_write(BIO *h, const char *buf, int num); 69 static int nbiof_read(BIO *h, char *buf, int size); 70 static int nbiof_puts(BIO *h, const char *str); 71 static int nbiof_gets(BIO *h, char *str, int size); 72 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); 73 static int nbiof_new(BIO *h); 74 static int nbiof_free(BIO *data); 75 static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 76 77 typedef struct nbio_test_st { 78 /* only set if we sent a 'should retry' error */ 79 int lrn; 80 int lwn; 81 } NBIO_TEST; 82 83 static BIO_METHOD methods_nbiof = { 84 .type = BIO_TYPE_NBIO_TEST, 85 .name = "non-blocking IO test filter", 86 .bwrite = nbiof_write, 87 .bread = nbiof_read, 88 .bputs = nbiof_puts, 89 .bgets = nbiof_gets, 90 .ctrl = nbiof_ctrl, 91 .create = nbiof_new, 92 .destroy = nbiof_free, 93 .callback_ctrl = nbiof_callback_ctrl 94 }; 95 96 BIO_METHOD * 97 BIO_f_nbio_test(void) 98 { 99 return (&methods_nbiof); 100 } 101 102 static int 103 nbiof_new(BIO *bi) 104 { 105 NBIO_TEST *nt; 106 107 if (!(nt = malloc(sizeof(NBIO_TEST)))) 108 return (0); 109 nt->lrn = -1; 110 nt->lwn = -1; 111 bi->ptr = (char *)nt; 112 bi->init = 1; 113 bi->flags = 0; 114 return (1); 115 } 116 117 static int 118 nbiof_free(BIO *a) 119 { 120 if (a == NULL) 121 return (0); 122 free(a->ptr); 123 a->ptr = NULL; 124 a->init = 0; 125 a->flags = 0; 126 return (1); 127 } 128 129 static int 130 nbiof_read(BIO *b, char *out, int outl) 131 { 132 int ret = 0; 133 int num; 134 unsigned char n; 135 136 if (out == NULL) 137 return (0); 138 if (b->next_bio == NULL) 139 return (0); 140 141 BIO_clear_retry_flags(b); 142 143 arc4random_buf(&n, 1); 144 num = (n & 0x07); 145 146 if (outl > num) 147 outl = num; 148 149 if (num == 0) { 150 ret = -1; 151 BIO_set_retry_read(b); 152 } else { 153 ret = BIO_read(b->next_bio, out, outl); 154 if (ret < 0) 155 BIO_copy_next_retry(b); 156 } 157 return (ret); 158 } 159 160 static int 161 nbiof_write(BIO *b, const char *in, int inl) 162 { 163 NBIO_TEST *nt; 164 int ret = 0; 165 int num; 166 unsigned char n; 167 168 if ((in == NULL) || (inl <= 0)) 169 return (0); 170 if (b->next_bio == NULL) 171 return (0); 172 nt = (NBIO_TEST *)b->ptr; 173 174 BIO_clear_retry_flags(b); 175 176 if (nt->lwn > 0) { 177 num = nt->lwn; 178 nt->lwn = 0; 179 } else { 180 arc4random_buf(&n, 1); 181 num = (n&7); 182 } 183 184 if (inl > num) 185 inl = num; 186 187 if (num == 0) { 188 ret = -1; 189 BIO_set_retry_write(b); 190 } else { 191 ret = BIO_write(b->next_bio, in, inl); 192 if (ret < 0) { 193 BIO_copy_next_retry(b); 194 nt->lwn = inl; 195 } 196 } 197 return (ret); 198 } 199 200 static long 201 nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) 202 { 203 long ret; 204 205 if (b->next_bio == NULL) 206 return (0); 207 switch (cmd) { 208 case BIO_C_DO_STATE_MACHINE: 209 BIO_clear_retry_flags(b); 210 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 211 BIO_copy_next_retry(b); 212 break; 213 case BIO_CTRL_DUP: 214 ret = 0L; 215 break; 216 default: 217 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 218 break; 219 } 220 return (ret); 221 } 222 223 static long 224 nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 225 { 226 long ret = 1; 227 228 if (b->next_bio == NULL) 229 return (0); 230 switch (cmd) { 231 default: 232 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 233 break; 234 } 235 return (ret); 236 } 237 238 static int 239 nbiof_gets(BIO *bp, char *buf, int size) 240 { 241 if (bp->next_bio == NULL) 242 return (0); 243 return (BIO_gets(bp->next_bio, buf, size)); 244 } 245 246 static int 247 nbiof_puts(BIO *bp, const char *str) 248 { 249 if (bp->next_bio == NULL) 250 return (0); 251 return (BIO_puts(bp->next_bio, str)); 252 } 253