/* $OpenBSD: bf_nbio.c,v 1.23 2023/07/05 21:23:37 beck Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <openssl/bio.h> #include "bio_local.h" /* BIO_put and BIO_get both add to the digest, * BIO_gets returns the digest */ static int nbiof_write(BIO *h, const char *buf, int num); static int nbiof_read(BIO *h, char *buf, int size); static int nbiof_puts(BIO *h, const char *str); static int nbiof_gets(BIO *h, char *str, int size); static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); static int nbiof_new(BIO *h); static int nbiof_free(BIO *data); static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); typedef struct nbio_test_st { /* only set if we sent a 'should retry' error */ int lrn; int lwn; } NBIO_TEST; static const BIO_METHOD methods_nbiof = { .type = BIO_TYPE_NBIO_TEST, .name = "non-blocking IO test filter", .bwrite = nbiof_write, .bread = nbiof_read, .bputs = nbiof_puts, .bgets = nbiof_gets, .ctrl = nbiof_ctrl, .create = nbiof_new, .destroy = nbiof_free, .callback_ctrl = nbiof_callback_ctrl }; const BIO_METHOD * BIO_f_nbio_test(void) { return (&methods_nbiof); } LCRYPTO_ALIAS(BIO_f_nbio_test); static int nbiof_new(BIO *bi) { NBIO_TEST *nt; if (!(nt = malloc(sizeof(NBIO_TEST)))) return (0); nt->lrn = -1; nt->lwn = -1; bi->ptr = (char *)nt; bi->init = 1; bi->flags = 0; return (1); } static int nbiof_free(BIO *a) { if (a == NULL) return (0); free(a->ptr); a->ptr = NULL; a->init = 0; a->flags = 0; return (1); } static int nbiof_read(BIO *b, char *out, int outl) { int ret = 0; int num; unsigned char n; if (out == NULL) return (0); if (b->next_bio == NULL) return (0); BIO_clear_retry_flags(b); arc4random_buf(&n, 1); num = (n & 0x07); if (outl > num) outl = num; if (num == 0) { ret = -1; BIO_set_retry_read(b); } else { ret = BIO_read(b->next_bio, out, outl); if (ret < 0) BIO_copy_next_retry(b); } return (ret); } static int nbiof_write(BIO *b, const char *in, int inl) { NBIO_TEST *nt; int ret = 0; int num; unsigned char n; if ((in == NULL) || (inl <= 0)) return (0); if (b->next_bio == NULL) return (0); nt = (NBIO_TEST *)b->ptr; BIO_clear_retry_flags(b); if (nt->lwn > 0) { num = nt->lwn; nt->lwn = 0; } else { arc4random_buf(&n, 1); num = (n&7); } if (inl > num) inl = num; if (num == 0) { ret = -1; BIO_set_retry_write(b); } else { ret = BIO_write(b->next_bio, in, inl); if (ret < 0) { BIO_copy_next_retry(b); nt->lwn = inl; } } return (ret); } static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) { long ret; if (b->next_bio == NULL) return (0); switch (cmd) { case BIO_C_DO_STATE_MACHINE: BIO_clear_retry_flags(b); ret = BIO_ctrl(b->next_bio, cmd, num, ptr); BIO_copy_next_retry(b); break; case BIO_CTRL_DUP: ret = 0L; break; default: ret = BIO_ctrl(b->next_bio, cmd, num, ptr); break; } return (ret); } static long nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) { long ret = 1; if (b->next_bio == NULL) return (0); switch (cmd) { default: ret = BIO_callback_ctrl(b->next_bio, cmd, fp); break; } return (ret); } static int nbiof_gets(BIO *bp, char *buf, int size) { if (bp->next_bio == NULL) return (0); return (BIO_gets(bp->next_bio, buf, size)); } static int nbiof_puts(BIO *bp, const char *str) { if (bp->next_bio == NULL) return (0); return (BIO_puts(bp->next_bio, str)); }
