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/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "bio_local.h"
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#include "internal/cryptlib.h"
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#include <openssl/rand.h>
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/*
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* BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
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*/
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static int nbiof_write(BIO *h, const char *buf, int num);
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static int nbiof_read(BIO *h, char *buf, int size);
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static int nbiof_puts(BIO *h, const char *str);
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static int nbiof_gets(BIO *h, char *str, int size);
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static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int nbiof_new(BIO *h);
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static int nbiof_free(BIO *data);
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static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
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typedef struct nbio_test_st {
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/* only set if we sent a 'should retry' error */
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int lrn;
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int lwn;
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} NBIO_TEST;
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static const BIO_METHOD methods_nbiof = {
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BIO_TYPE_NBIO_TEST,
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"non-blocking IO test filter",
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/* TODO: Convert to new style write function */
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bwrite_conv,
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nbiof_write,
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/* TODO: Convert to new style read function */
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bread_conv,
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nbiof_read,
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nbiof_puts,
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nbiof_gets,
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nbiof_ctrl,
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nbiof_new,
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nbiof_free,
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nbiof_callback_ctrl,
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};
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const BIO_METHOD *BIO_f_nbio_test(void)
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{
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return &methods_nbiof;
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}
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static int nbiof_new(BIO *bi)
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{
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NBIO_TEST *nt;
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if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL) {
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BIOerr(BIO_F_NBIOF_NEW, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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nt->lrn = -1;
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nt->lwn = -1;
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bi->ptr = (char *)nt;
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bi->init = 1;
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return 1;
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}
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static int nbiof_free(BIO *a)
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{
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if (a == NULL)
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return 0;
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OPENSSL_free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return 1;
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}
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static int nbiof_read(BIO *b, char *out, int outl)
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{
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int ret = 0;
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int num;
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unsigned char n;
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if (out == NULL)
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return 0;
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if (b->next_bio == NULL)
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return 0;
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BIO_clear_retry_flags(b);
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if (RAND_priv_bytes(&n, 1) <= 0)
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return -1;
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num = (n & 0x07);
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if (outl > num)
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outl = num;
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if (num == 0) {
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ret = -1;
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BIO_set_retry_read(b);
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} else {
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ret = BIO_read(b->next_bio, out, outl);
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if (ret < 0)
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BIO_copy_next_retry(b);
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}
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return ret;
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}
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static int nbiof_write(BIO *b, const char *in, int inl)
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{
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NBIO_TEST *nt;
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int ret = 0;
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int num;
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unsigned char n;
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if ((in == NULL) || (inl <= 0))
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return 0;
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if (b->next_bio == NULL)
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return 0;
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nt = (NBIO_TEST *)b->ptr;
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BIO_clear_retry_flags(b);
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if (nt->lwn > 0) {
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num = nt->lwn;
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nt->lwn = 0;
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} else {
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if (RAND_priv_bytes(&n, 1) <= 0)
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return -1;
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num = (n & 7);
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}
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if (inl > num)
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inl = num;
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if (num == 0) {
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ret = -1;
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BIO_set_retry_write(b);
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} else {
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ret = BIO_write(b->next_bio, in, inl);
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if (ret < 0) {
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BIO_copy_next_retry(b);
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nt->lwn = inl;
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}
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}
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return ret;
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}
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static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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long ret;
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if (b->next_bio == NULL)
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return 0;
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switch (cmd) {
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_CTRL_DUP:
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ret = 0L;
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break;
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default:
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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}
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return ret;
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}
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static long nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
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{
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long ret = 1;
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if (b->next_bio == NULL)
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return 0;
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switch (cmd) {
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default:
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ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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break;
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}
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return ret;
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}
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static int nbiof_gets(BIO *bp, char *buf, int size)
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{
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if (bp->next_bio == NULL)
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return 0;
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return BIO_gets(bp->next_bio, buf, size);
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}
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static int nbiof_puts(BIO *bp, const char *str)
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{
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if (bp->next_bio == NULL)
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return 0;
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return BIO_puts(bp->next_bio, str);
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}
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