155714Skris/* crypto/bio/bf_nbio.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include <errno.h> 6155714Skris#include "cryptlib.h" 6255714Skris#include <openssl/rand.h> 6355714Skris#include <openssl/bio.h> 6455714Skris 65280297Sjkim/* 66280297Sjkim * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest 67280297Sjkim */ 6855714Skris 69280297Sjkimstatic int nbiof_write(BIO *h, const char *buf, int num); 70280297Sjkimstatic int nbiof_read(BIO *h, char *buf, int size); 71280297Sjkimstatic int nbiof_puts(BIO *h, const char *str); 72280297Sjkimstatic int nbiof_gets(BIO *h, char *str, int size); 73280297Sjkimstatic long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); 7455714Skrisstatic int nbiof_new(BIO *h); 7555714Skrisstatic int nbiof_free(BIO *data); 76280297Sjkimstatic long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 77280297Sjkimtypedef struct nbio_test_st { 78280297Sjkim /* only set if we sent a 'should retry' error */ 79280297Sjkim int lrn; 80280297Sjkim int lwn; 81280297Sjkim} NBIO_TEST; 8255714Skris 83280297Sjkimstatic BIO_METHOD methods_nbiof = { 84280297Sjkim BIO_TYPE_NBIO_TEST, 85280297Sjkim "non-blocking IO test filter", 86280297Sjkim nbiof_write, 87280297Sjkim nbiof_read, 88280297Sjkim nbiof_puts, 89280297Sjkim nbiof_gets, 90280297Sjkim nbiof_ctrl, 91280297Sjkim nbiof_new, 92280297Sjkim nbiof_free, 93280297Sjkim nbiof_callback_ctrl, 94280297Sjkim}; 9555714Skris 9655714SkrisBIO_METHOD *BIO_f_nbio_test(void) 97280297Sjkim{ 98280297Sjkim return (&methods_nbiof); 99280297Sjkim} 10055714Skris 10155714Skrisstatic int nbiof_new(BIO *bi) 102280297Sjkim{ 103280297Sjkim NBIO_TEST *nt; 10455714Skris 105280297Sjkim if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) 106280297Sjkim return (0); 107280297Sjkim nt->lrn = -1; 108280297Sjkim nt->lwn = -1; 109280297Sjkim bi->ptr = (char *)nt; 110280297Sjkim bi->init = 1; 111280297Sjkim bi->flags = 0; 112280297Sjkim return (1); 113280297Sjkim} 11455714Skris 11555714Skrisstatic int nbiof_free(BIO *a) 116280297Sjkim{ 117280297Sjkim if (a == NULL) 118280297Sjkim return (0); 119280297Sjkim if (a->ptr != NULL) 120280297Sjkim OPENSSL_free(a->ptr); 121280297Sjkim a->ptr = NULL; 122280297Sjkim a->init = 0; 123280297Sjkim a->flags = 0; 124280297Sjkim return (1); 125280297Sjkim} 126280297Sjkim 12755714Skrisstatic int nbiof_read(BIO *b, char *out, int outl) 128280297Sjkim{ 129280297Sjkim int ret = 0; 130160814Ssimon#if 1 131280297Sjkim int num; 132280297Sjkim unsigned char n; 13355714Skris#endif 13455714Skris 135280297Sjkim if (out == NULL) 136280297Sjkim return (0); 137280297Sjkim if (b->next_bio == NULL) 138280297Sjkim return (0); 13955714Skris 140280297Sjkim BIO_clear_retry_flags(b); 141160814Ssimon#if 1 142306195Sjkim if (RAND_bytes(&n, 1) <= 0) 143284283Sjkim return -1; 144280297Sjkim num = (n & 0x07); 14555714Skris 146280297Sjkim if (outl > num) 147280297Sjkim outl = num; 14855714Skris 149280297Sjkim if (num == 0) { 150280297Sjkim ret = -1; 151280297Sjkim BIO_set_retry_read(b); 152280297Sjkim } else 15355714Skris#endif 154280297Sjkim { 155280297Sjkim ret = BIO_read(b->next_bio, out, outl); 156280297Sjkim if (ret < 0) 157280297Sjkim BIO_copy_next_retry(b); 158280297Sjkim } 159280297Sjkim return (ret); 160280297Sjkim} 16155714Skris 16268651Skrisstatic int nbiof_write(BIO *b, const char *in, int inl) 163280297Sjkim{ 164280297Sjkim NBIO_TEST *nt; 165280297Sjkim int ret = 0; 166280297Sjkim int num; 167280297Sjkim unsigned char n; 16855714Skris 169280297Sjkim if ((in == NULL) || (inl <= 0)) 170280297Sjkim return (0); 171280297Sjkim if (b->next_bio == NULL) 172280297Sjkim return (0); 173280297Sjkim nt = (NBIO_TEST *)b->ptr; 17455714Skris 175280297Sjkim BIO_clear_retry_flags(b); 17655714Skris 17755714Skris#if 1 178280297Sjkim if (nt->lwn > 0) { 179280297Sjkim num = nt->lwn; 180280297Sjkim nt->lwn = 0; 181280297Sjkim } else { 182306195Sjkim if (RAND_bytes(&n, 1) <= 0) 183284283Sjkim return -1; 184280297Sjkim num = (n & 7); 185280297Sjkim } 18655714Skris 187280297Sjkim if (inl > num) 188280297Sjkim inl = num; 18955714Skris 190280297Sjkim if (num == 0) { 191280297Sjkim ret = -1; 192280297Sjkim BIO_set_retry_write(b); 193280297Sjkim } else 19455714Skris#endif 195280297Sjkim { 196280297Sjkim ret = BIO_write(b->next_bio, in, inl); 197280297Sjkim if (ret < 0) { 198280297Sjkim BIO_copy_next_retry(b); 199280297Sjkim nt->lwn = inl; 200280297Sjkim } 201280297Sjkim } 202280297Sjkim return (ret); 203280297Sjkim} 20455714Skris 20568651Skrisstatic long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) 206280297Sjkim{ 207280297Sjkim long ret; 20855714Skris 209280297Sjkim if (b->next_bio == NULL) 210280297Sjkim return (0); 211280297Sjkim switch (cmd) { 212280297Sjkim case BIO_C_DO_STATE_MACHINE: 213280297Sjkim BIO_clear_retry_flags(b); 214280297Sjkim ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 215280297Sjkim BIO_copy_next_retry(b); 216280297Sjkim break; 217280297Sjkim case BIO_CTRL_DUP: 218280297Sjkim ret = 0L; 219280297Sjkim break; 220280297Sjkim default: 221280297Sjkim ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 222280297Sjkim break; 223280297Sjkim } 224280297Sjkim return (ret); 225280297Sjkim} 22655714Skris 22768651Skrisstatic long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 228280297Sjkim{ 229280297Sjkim long ret = 1; 23059191Skris 231280297Sjkim if (b->next_bio == NULL) 232280297Sjkim return (0); 233280297Sjkim switch (cmd) { 234280297Sjkim default: 235280297Sjkim ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 236280297Sjkim break; 237280297Sjkim } 238280297Sjkim return (ret); 239280297Sjkim} 24059191Skris 24155714Skrisstatic int nbiof_gets(BIO *bp, char *buf, int size) 242280297Sjkim{ 243280297Sjkim if (bp->next_bio == NULL) 244280297Sjkim return (0); 245280297Sjkim return (BIO_gets(bp->next_bio, buf, size)); 246280297Sjkim} 24755714Skris 24868651Skrisstatic int nbiof_puts(BIO *bp, const char *str) 249280297Sjkim{ 250280297Sjkim if (bp->next_bio == NULL) 251280297Sjkim return (0); 252280297Sjkim return (BIO_puts(bp->next_bio, str)); 253280297Sjkim} 254