[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 | #include "bio_lcl.h"
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| 13 | #include "internal/cryptlib.h"
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| 14 | #include <openssl/rand.h>
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| 15 |
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| 16 | /*
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| 17 | * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
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| 18 | */
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| 19 |
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| 20 | static int nbiof_write(BIO *h, const char *buf, int num);
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| 21 | static int nbiof_read(BIO *h, char *buf, int size);
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| 22 | static int nbiof_puts(BIO *h, const char *str);
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| 23 | static int nbiof_gets(BIO *h, char *str, int size);
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| 24 | static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 25 | static int nbiof_new(BIO *h);
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| 26 | static int nbiof_free(BIO *data);
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| 27 | static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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| 28 | typedef struct nbio_test_st {
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| 29 | /* only set if we sent a 'should retry' error */
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| 30 | int lrn;
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| 31 | int lwn;
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| 32 | } NBIO_TEST;
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| 33 |
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| 34 | static const BIO_METHOD methods_nbiof = {
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| 35 | BIO_TYPE_NBIO_TEST,
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| 36 | "non-blocking IO test filter",
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| 37 | nbiof_write,
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| 38 | nbiof_read,
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| 39 | nbiof_puts,
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| 40 | nbiof_gets,
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| 41 | nbiof_ctrl,
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| 42 | nbiof_new,
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| 43 | nbiof_free,
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| 44 | nbiof_callback_ctrl,
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| 45 | };
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| 46 |
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| 47 | const BIO_METHOD *BIO_f_nbio_test(void)
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| 48 | {
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| 49 | return (&methods_nbiof);
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| 50 | }
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| 51 |
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| 52 | static int nbiof_new(BIO *bi)
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| 53 | {
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| 54 | NBIO_TEST *nt;
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| 55 |
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| 56 | if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL)
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| 57 | return (0);
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| 58 | nt->lrn = -1;
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| 59 | nt->lwn = -1;
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| 60 | bi->ptr = (char *)nt;
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| 61 | bi->init = 1;
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| 62 | return (1);
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| 63 | }
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| 64 |
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| 65 | static int nbiof_free(BIO *a)
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| 66 | {
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| 67 | if (a == NULL)
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| 68 | return (0);
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| 69 | OPENSSL_free(a->ptr);
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| 70 | a->ptr = NULL;
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| 71 | a->init = 0;
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| 72 | a->flags = 0;
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| 73 | return (1);
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| 74 | }
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| 75 |
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| 76 | static int nbiof_read(BIO *b, char *out, int outl)
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| 77 | {
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| 78 | int ret = 0;
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| 79 | int num;
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| 80 | unsigned char n;
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| 81 |
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| 82 | if (out == NULL)
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| 83 | return (0);
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| 84 | if (b->next_bio == NULL)
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| 85 | return (0);
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| 86 |
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| 87 | BIO_clear_retry_flags(b);
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| 88 | if (RAND_bytes(&n, 1) <= 0)
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| 89 | return -1;
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| 90 | num = (n & 0x07);
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| 91 |
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| 92 | if (outl > num)
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| 93 | outl = num;
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| 94 |
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| 95 | if (num == 0) {
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| 96 | ret = -1;
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| 97 | BIO_set_retry_read(b);
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| 98 | } else {
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| 99 | ret = BIO_read(b->next_bio, out, outl);
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| 100 | if (ret < 0)
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| 101 | BIO_copy_next_retry(b);
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| 102 | }
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| 103 | return (ret);
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| 104 | }
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| 105 |
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| 106 | static int nbiof_write(BIO *b, const char *in, int inl)
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| 107 | {
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| 108 | NBIO_TEST *nt;
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| 109 | int ret = 0;
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| 110 | int num;
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| 111 | unsigned char n;
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| 112 |
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| 113 | if ((in == NULL) || (inl <= 0))
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| 114 | return (0);
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| 115 | if (b->next_bio == NULL)
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| 116 | return (0);
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| 117 | nt = (NBIO_TEST *)b->ptr;
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| 118 |
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| 119 | BIO_clear_retry_flags(b);
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| 120 |
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| 121 | if (nt->lwn > 0) {
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| 122 | num = nt->lwn;
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| 123 | nt->lwn = 0;
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| 124 | } else {
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| 125 | if (RAND_bytes(&n, 1) <= 0)
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| 126 | return -1;
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| 127 | num = (n & 7);
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| 128 | }
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| 129 |
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| 130 | if (inl > num)
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| 131 | inl = num;
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| 132 |
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| 133 | if (num == 0) {
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| 134 | ret = -1;
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| 135 | BIO_set_retry_write(b);
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| 136 | } else {
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| 137 | ret = BIO_write(b->next_bio, in, inl);
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| 138 | if (ret < 0) {
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| 139 | BIO_copy_next_retry(b);
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| 140 | nt->lwn = inl;
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| 141 | }
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| 142 | }
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| 143 | return (ret);
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| 144 | }
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| 145 |
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| 146 | static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 147 | {
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| 148 | long ret;
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| 149 |
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| 150 | if (b->next_bio == NULL)
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| 151 | return (0);
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| 152 | switch (cmd) {
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| 153 | case BIO_C_DO_STATE_MACHINE:
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| 154 | BIO_clear_retry_flags(b);
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| 155 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 156 | BIO_copy_next_retry(b);
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| 157 | break;
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| 158 | case BIO_CTRL_DUP:
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| 159 | ret = 0L;
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| 160 | break;
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| 161 | default:
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| 162 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 163 | break;
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| 164 | }
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| 165 | return (ret);
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| 166 | }
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| 167 |
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| 168 | static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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| 169 | {
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| 170 | long ret = 1;
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| 171 |
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| 172 | if (b->next_bio == NULL)
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| 173 | return (0);
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| 174 | switch (cmd) {
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| 175 | default:
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| 176 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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| 177 | break;
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| 178 | }
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| 179 | return (ret);
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| 180 | }
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| 181 |
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| 182 | static int nbiof_gets(BIO *bp, char *buf, int size)
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| 183 | {
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| 184 | if (bp->next_bio == NULL)
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| 185 | return (0);
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| 186 | return (BIO_gets(bp->next_bio, buf, size));
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| 187 | }
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| 188 |
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| 189 | static int nbiof_puts(BIO *bp, const char *str)
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| 190 | {
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| 191 | if (bp->next_bio == NULL)
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| 192 | return (0);
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| 193 | return (BIO_puts(bp->next_bio, str));
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| 194 | }
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