1 | /*
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2 | * Copyright 1999-2016 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 | /*
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11 | * Special method for a BIO where the other endpoint is also a BIO of this
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12 | * kind, handled by the same thread (i.e. the "peer" is actually ourselves,
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13 | * wearing a different hat). Such "BIO pairs" are mainly for using the SSL
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14 | * library with I/O interfaces for which no specific BIO method is available.
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15 | * See ssl/ssltest.c for some hints on how this can be used.
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16 | */
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17 |
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18 | #include <assert.h>
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19 | #include <limits.h>
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20 | #include <stdlib.h>
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21 | #include <string.h>
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22 |
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23 | #include "bio_lcl.h"
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24 | #include <openssl/err.h>
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25 | #include <openssl/crypto.h>
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26 |
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27 | #include "e_os.h"
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28 |
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29 | static int bio_new(BIO *bio);
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30 | static int bio_free(BIO *bio);
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31 | static int bio_read(BIO *bio, char *buf, int size);
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32 | static int bio_write(BIO *bio, const char *buf, int num);
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33 | static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);
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34 | static int bio_puts(BIO *bio, const char *str);
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35 |
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36 | static int bio_make_pair(BIO *bio1, BIO *bio2);
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37 | static void bio_destroy_pair(BIO *bio);
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38 |
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39 | static const BIO_METHOD methods_biop = {
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40 | BIO_TYPE_BIO,
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41 | "BIO pair",
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42 | bio_write,
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43 | bio_read,
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44 | bio_puts,
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45 | NULL /* no bio_gets */ ,
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46 | bio_ctrl,
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47 | bio_new,
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48 | bio_free,
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49 | NULL /* no bio_callback_ctrl */
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50 | };
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51 |
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52 | const BIO_METHOD *BIO_s_bio(void)
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53 | {
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54 | return &methods_biop;
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55 | }
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56 |
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57 | struct bio_bio_st {
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58 | BIO *peer; /* NULL if buf == NULL. If peer != NULL, then
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59 | * peer->ptr is also a bio_bio_st, and its
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60 | * "peer" member points back to us. peer !=
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61 | * NULL iff init != 0 in the BIO. */
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62 | /* This is for what we write (i.e. reading uses peer's struct): */
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63 | int closed; /* valid iff peer != NULL */
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64 | size_t len; /* valid iff buf != NULL; 0 if peer == NULL */
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65 | size_t offset; /* valid iff buf != NULL; 0 if len == 0 */
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66 | size_t size;
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67 | char *buf; /* "size" elements (if != NULL) */
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68 | size_t request; /* valid iff peer != NULL; 0 if len != 0,
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69 | * otherwise set by peer to number of bytes
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70 | * it (unsuccessfully) tried to read, never
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71 | * more than buffer space (size-len)
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72 | * warrants. */
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73 | };
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74 |
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75 | static int bio_new(BIO *bio)
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76 | {
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77 | struct bio_bio_st *b = OPENSSL_zalloc(sizeof(*b));
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78 |
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79 | if (b == NULL)
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80 | return 0;
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81 |
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82 | /* enough for one TLS record (just a default) */
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83 | b->size = 17 * 1024;
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84 |
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85 | bio->ptr = b;
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86 | return 1;
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87 | }
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88 |
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89 | static int bio_free(BIO *bio)
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90 | {
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91 | struct bio_bio_st *b;
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92 |
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93 | if (bio == NULL)
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94 | return 0;
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95 | b = bio->ptr;
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96 |
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97 | assert(b != NULL);
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98 |
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99 | if (b->peer)
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100 | bio_destroy_pair(bio);
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101 |
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102 | OPENSSL_free(b->buf);
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103 | OPENSSL_free(b);
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104 |
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105 | return 1;
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106 | }
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107 |
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108 | static int bio_read(BIO *bio, char *buf, int size_)
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109 | {
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110 | size_t size = size_;
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111 | size_t rest;
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112 | struct bio_bio_st *b, *peer_b;
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113 |
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114 | BIO_clear_retry_flags(bio);
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115 |
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116 | if (!bio->init)
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117 | return 0;
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118 |
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119 | b = bio->ptr;
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120 | assert(b != NULL);
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121 | assert(b->peer != NULL);
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122 | peer_b = b->peer->ptr;
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123 | assert(peer_b != NULL);
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124 | assert(peer_b->buf != NULL);
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125 |
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126 | peer_b->request = 0; /* will be set in "retry_read" situation */
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127 |
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128 | if (buf == NULL || size == 0)
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129 | return 0;
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130 |
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131 | if (peer_b->len == 0) {
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132 | if (peer_b->closed)
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133 | return 0; /* writer has closed, and no data is left */
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134 | else {
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135 | BIO_set_retry_read(bio); /* buffer is empty */
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136 | if (size <= peer_b->size)
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137 | peer_b->request = size;
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138 | else
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139 | /*
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140 | * don't ask for more than the peer can deliver in one write
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141 | */
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142 | peer_b->request = peer_b->size;
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143 | return -1;
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144 | }
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145 | }
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146 |
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147 | /* we can read */
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148 | if (peer_b->len < size)
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149 | size = peer_b->len;
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150 |
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151 | /* now read "size" bytes */
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152 |
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153 | rest = size;
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154 |
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155 | assert(rest > 0);
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156 | do { /* one or two iterations */
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157 | size_t chunk;
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158 |
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159 | assert(rest <= peer_b->len);
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160 | if (peer_b->offset + rest <= peer_b->size)
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161 | chunk = rest;
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162 | else
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163 | /* wrap around ring buffer */
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164 | chunk = peer_b->size - peer_b->offset;
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165 | assert(peer_b->offset + chunk <= peer_b->size);
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166 |
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167 | memcpy(buf, peer_b->buf + peer_b->offset, chunk);
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168 |
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169 | peer_b->len -= chunk;
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170 | if (peer_b->len) {
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171 | peer_b->offset += chunk;
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172 | assert(peer_b->offset <= peer_b->size);
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173 | if (peer_b->offset == peer_b->size)
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174 | peer_b->offset = 0;
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175 | buf += chunk;
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176 | } else {
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177 | /* buffer now empty, no need to advance "buf" */
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178 | assert(chunk == rest);
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179 | peer_b->offset = 0;
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180 | }
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181 | rest -= chunk;
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182 | }
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183 | while (rest);
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184 |
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185 | return size;
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186 | }
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187 |
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188 | /*-
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189 | * non-copying interface: provide pointer to available data in buffer
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190 | * bio_nread0: return number of available bytes
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191 | * bio_nread: also advance index
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192 | * (example usage: bio_nread0(), read from buffer, bio_nread()
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193 | * or just bio_nread(), read from buffer)
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194 | */
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195 | /*
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196 | * WARNING: The non-copying interface is largely untested as of yet and may
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197 | * contain bugs.
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198 | */
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199 | static ossl_ssize_t bio_nread0(BIO *bio, char **buf)
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200 | {
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201 | struct bio_bio_st *b, *peer_b;
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202 | ossl_ssize_t num;
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203 |
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204 | BIO_clear_retry_flags(bio);
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205 |
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206 | if (!bio->init)
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207 | return 0;
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208 |
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209 | b = bio->ptr;
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210 | assert(b != NULL);
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211 | assert(b->peer != NULL);
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212 | peer_b = b->peer->ptr;
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213 | assert(peer_b != NULL);
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214 | assert(peer_b->buf != NULL);
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215 |
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216 | peer_b->request = 0;
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217 |
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218 | if (peer_b->len == 0) {
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219 | char dummy;
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220 |
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221 | /* avoid code duplication -- nothing available for reading */
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222 | return bio_read(bio, &dummy, 1); /* returns 0 or -1 */
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223 | }
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224 |
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225 | num = peer_b->len;
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226 | if (peer_b->size < peer_b->offset + num)
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227 | /* no ring buffer wrap-around for non-copying interface */
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228 | num = peer_b->size - peer_b->offset;
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229 | assert(num > 0);
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230 |
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231 | if (buf != NULL)
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232 | *buf = peer_b->buf + peer_b->offset;
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233 | return num;
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234 | }
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235 |
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236 | static ossl_ssize_t bio_nread(BIO *bio, char **buf, size_t num_)
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237 | {
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238 | struct bio_bio_st *b, *peer_b;
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239 | ossl_ssize_t num, available;
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240 |
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241 | if (num_ > OSSL_SSIZE_MAX)
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242 | num = OSSL_SSIZE_MAX;
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243 | else
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244 | num = (ossl_ssize_t) num_;
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245 |
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246 | available = bio_nread0(bio, buf);
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247 | if (num > available)
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248 | num = available;
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249 | if (num <= 0)
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250 | return num;
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251 |
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252 | b = bio->ptr;
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253 | peer_b = b->peer->ptr;
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254 |
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255 | peer_b->len -= num;
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256 | if (peer_b->len) {
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257 | peer_b->offset += num;
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258 | assert(peer_b->offset <= peer_b->size);
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259 | if (peer_b->offset == peer_b->size)
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260 | peer_b->offset = 0;
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261 | } else
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262 | peer_b->offset = 0;
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263 |
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264 | return num;
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265 | }
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266 |
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267 | static int bio_write(BIO *bio, const char *buf, int num_)
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268 | {
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269 | size_t num = num_;
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270 | size_t rest;
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271 | struct bio_bio_st *b;
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272 |
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273 | BIO_clear_retry_flags(bio);
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274 |
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275 | if (!bio->init || buf == NULL || num == 0)
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276 | return 0;
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277 |
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278 | b = bio->ptr;
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279 | assert(b != NULL);
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280 | assert(b->peer != NULL);
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281 | assert(b->buf != NULL);
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282 |
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283 | b->request = 0;
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284 | if (b->closed) {
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285 | /* we already closed */
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286 | BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE);
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287 | return -1;
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288 | }
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289 |
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290 | assert(b->len <= b->size);
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291 |
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292 | if (b->len == b->size) {
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293 | BIO_set_retry_write(bio); /* buffer is full */
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294 | return -1;
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295 | }
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296 |
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297 | /* we can write */
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298 | if (num > b->size - b->len)
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299 | num = b->size - b->len;
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300 |
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301 | /* now write "num" bytes */
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302 |
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303 | rest = num;
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304 |
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305 | assert(rest > 0);
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306 | do { /* one or two iterations */
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307 | size_t write_offset;
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308 | size_t chunk;
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309 |
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310 | assert(b->len + rest <= b->size);
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311 |
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312 | write_offset = b->offset + b->len;
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313 | if (write_offset >= b->size)
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314 | write_offset -= b->size;
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315 | /* b->buf[write_offset] is the first byte we can write to. */
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316 |
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317 | if (write_offset + rest <= b->size)
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318 | chunk = rest;
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319 | else
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320 | /* wrap around ring buffer */
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321 | chunk = b->size - write_offset;
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322 |
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323 | memcpy(b->buf + write_offset, buf, chunk);
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324 |
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325 | b->len += chunk;
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326 |
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327 | assert(b->len <= b->size);
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328 |
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329 | rest -= chunk;
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330 | buf += chunk;
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331 | }
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332 | while (rest);
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333 |
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334 | return num;
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335 | }
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336 |
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337 | /*-
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338 | * non-copying interface: provide pointer to region to write to
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339 | * bio_nwrite0: check how much space is available
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340 | * bio_nwrite: also increase length
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341 | * (example usage: bio_nwrite0(), write to buffer, bio_nwrite()
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342 | * or just bio_nwrite(), write to buffer)
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343 | */
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344 | static ossl_ssize_t bio_nwrite0(BIO *bio, char **buf)
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345 | {
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346 | struct bio_bio_st *b;
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347 | size_t num;
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348 | size_t write_offset;
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349 |
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350 | BIO_clear_retry_flags(bio);
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351 |
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352 | if (!bio->init)
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353 | return 0;
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354 |
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355 | b = bio->ptr;
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356 | assert(b != NULL);
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357 | assert(b->peer != NULL);
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358 | assert(b->buf != NULL);
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359 |
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360 | b->request = 0;
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361 | if (b->closed) {
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362 | BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);
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363 | return -1;
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364 | }
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365 |
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366 | assert(b->len <= b->size);
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367 |
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368 | if (b->len == b->size) {
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369 | BIO_set_retry_write(bio);
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370 | return -1;
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371 | }
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372 |
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373 | num = b->size - b->len;
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374 | write_offset = b->offset + b->len;
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375 | if (write_offset >= b->size)
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376 | write_offset -= b->size;
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377 | if (write_offset + num > b->size)
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378 | /*
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379 | * no ring buffer wrap-around for non-copying interface (to fulfil
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380 | * the promise by BIO_ctrl_get_write_guarantee, BIO_nwrite may have
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381 | * to be called twice)
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382 | */
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383 | num = b->size - write_offset;
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384 |
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385 | if (buf != NULL)
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386 | *buf = b->buf + write_offset;
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387 | assert(write_offset + num <= b->size);
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388 |
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389 | return num;
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390 | }
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391 |
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392 | static ossl_ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_)
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393 | {
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394 | struct bio_bio_st *b;
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395 | ossl_ssize_t num, space;
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396 |
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397 | if (num_ > OSSL_SSIZE_MAX)
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398 | num = OSSL_SSIZE_MAX;
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399 | else
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400 | num = (ossl_ssize_t) num_;
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401 |
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402 | space = bio_nwrite0(bio, buf);
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403 | if (num > space)
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404 | num = space;
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405 | if (num <= 0)
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406 | return num;
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407 | b = bio->ptr;
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408 | assert(b != NULL);
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409 | b->len += num;
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410 | assert(b->len <= b->size);
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411 |
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412 | return num;
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413 | }
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414 |
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415 | static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)
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416 | {
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417 | long ret;
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418 | struct bio_bio_st *b = bio->ptr;
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419 |
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420 | assert(b != NULL);
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421 |
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422 | switch (cmd) {
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423 | /* specific CTRL codes */
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424 |
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425 | case BIO_C_SET_WRITE_BUF_SIZE:
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426 | if (b->peer) {
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427 | BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE);
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428 | ret = 0;
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429 | } else if (num == 0) {
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430 | BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT);
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431 | ret = 0;
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432 | } else {
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433 | size_t new_size = num;
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434 |
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435 | if (b->size != new_size) {
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436 | OPENSSL_free(b->buf);
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437 | b->buf = NULL;
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438 | b->size = new_size;
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439 | }
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440 | ret = 1;
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441 | }
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442 | break;
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443 |
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444 | case BIO_C_GET_WRITE_BUF_SIZE:
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445 | ret = (long)b->size;
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446 | break;
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447 |
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448 | case BIO_C_MAKE_BIO_PAIR:
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449 | {
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450 | BIO *other_bio = ptr;
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451 |
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452 | if (bio_make_pair(bio, other_bio))
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453 | ret = 1;
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454 | else
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455 | ret = 0;
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456 | }
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457 | break;
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458 |
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459 | case BIO_C_DESTROY_BIO_PAIR:
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460 | /*
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461 | * Affects both BIOs in the pair -- call just once! Or let
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462 | * BIO_free(bio1); BIO_free(bio2); do the job.
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463 | */
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464 | bio_destroy_pair(bio);
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465 | ret = 1;
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466 | break;
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467 |
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468 | case BIO_C_GET_WRITE_GUARANTEE:
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469 | /*
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470 | * How many bytes can the caller feed to the next write without
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471 | * having to keep any?
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472 | */
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473 | if (b->peer == NULL || b->closed)
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474 | ret = 0;
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475 | else
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476 | ret = (long)b->size - b->len;
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477 | break;
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478 |
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479 | case BIO_C_GET_READ_REQUEST:
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480 | /*
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481 | * If the peer unsuccessfully tried to read, how many bytes were
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482 | * requested? (As with BIO_CTRL_PENDING, that number can usually be
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483 | * treated as boolean.)
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484 | */
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485 | ret = (long)b->request;
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486 | break;
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487 |
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488 | case BIO_C_RESET_READ_REQUEST:
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489 | /*
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490 | * Reset request. (Can be useful after read attempts at the other
|
---|
491 | * side that are meant to be non-blocking, e.g. when probing SSL_read
|
---|
492 | * to see if any data is available.)
|
---|
493 | */
|
---|
494 | b->request = 0;
|
---|
495 | ret = 1;
|
---|
496 | break;
|
---|
497 |
|
---|
498 | case BIO_C_SHUTDOWN_WR:
|
---|
499 | /* similar to shutdown(..., SHUT_WR) */
|
---|
500 | b->closed = 1;
|
---|
501 | ret = 1;
|
---|
502 | break;
|
---|
503 |
|
---|
504 | case BIO_C_NREAD0:
|
---|
505 | /* prepare for non-copying read */
|
---|
506 | ret = (long)bio_nread0(bio, ptr);
|
---|
507 | break;
|
---|
508 |
|
---|
509 | case BIO_C_NREAD:
|
---|
510 | /* non-copying read */
|
---|
511 | ret = (long)bio_nread(bio, ptr, (size_t)num);
|
---|
512 | break;
|
---|
513 |
|
---|
514 | case BIO_C_NWRITE0:
|
---|
515 | /* prepare for non-copying write */
|
---|
516 | ret = (long)bio_nwrite0(bio, ptr);
|
---|
517 | break;
|
---|
518 |
|
---|
519 | case BIO_C_NWRITE:
|
---|
520 | /* non-copying write */
|
---|
521 | ret = (long)bio_nwrite(bio, ptr, (size_t)num);
|
---|
522 | break;
|
---|
523 |
|
---|
524 | /* standard CTRL codes follow */
|
---|
525 |
|
---|
526 | case BIO_CTRL_RESET:
|
---|
527 | if (b->buf != NULL) {
|
---|
528 | b->len = 0;
|
---|
529 | b->offset = 0;
|
---|
530 | }
|
---|
531 | ret = 0;
|
---|
532 | break;
|
---|
533 |
|
---|
534 | case BIO_CTRL_GET_CLOSE:
|
---|
535 | ret = bio->shutdown;
|
---|
536 | break;
|
---|
537 |
|
---|
538 | case BIO_CTRL_SET_CLOSE:
|
---|
539 | bio->shutdown = (int)num;
|
---|
540 | ret = 1;
|
---|
541 | break;
|
---|
542 |
|
---|
543 | case BIO_CTRL_PENDING:
|
---|
544 | if (b->peer != NULL) {
|
---|
545 | struct bio_bio_st *peer_b = b->peer->ptr;
|
---|
546 |
|
---|
547 | ret = (long)peer_b->len;
|
---|
548 | } else
|
---|
549 | ret = 0;
|
---|
550 | break;
|
---|
551 |
|
---|
552 | case BIO_CTRL_WPENDING:
|
---|
553 | if (b->buf != NULL)
|
---|
554 | ret = (long)b->len;
|
---|
555 | else
|
---|
556 | ret = 0;
|
---|
557 | break;
|
---|
558 |
|
---|
559 | case BIO_CTRL_DUP:
|
---|
560 | /* See BIO_dup_chain for circumstances we have to expect. */
|
---|
561 | {
|
---|
562 | BIO *other_bio = ptr;
|
---|
563 | struct bio_bio_st *other_b;
|
---|
564 |
|
---|
565 | assert(other_bio != NULL);
|
---|
566 | other_b = other_bio->ptr;
|
---|
567 | assert(other_b != NULL);
|
---|
568 |
|
---|
569 | assert(other_b->buf == NULL); /* other_bio is always fresh */
|
---|
570 |
|
---|
571 | other_b->size = b->size;
|
---|
572 | }
|
---|
573 |
|
---|
574 | ret = 1;
|
---|
575 | break;
|
---|
576 |
|
---|
577 | case BIO_CTRL_FLUSH:
|
---|
578 | ret = 1;
|
---|
579 | break;
|
---|
580 |
|
---|
581 | case BIO_CTRL_EOF:
|
---|
582 | if (b->peer != NULL) {
|
---|
583 | struct bio_bio_st *peer_b = b->peer->ptr;
|
---|
584 |
|
---|
585 | if (peer_b->len == 0 && peer_b->closed)
|
---|
586 | ret = 1;
|
---|
587 | else
|
---|
588 | ret = 0;
|
---|
589 | } else {
|
---|
590 | ret = 1;
|
---|
591 | }
|
---|
592 | break;
|
---|
593 |
|
---|
594 | default:
|
---|
595 | ret = 0;
|
---|
596 | }
|
---|
597 | return ret;
|
---|
598 | }
|
---|
599 |
|
---|
600 | static int bio_puts(BIO *bio, const char *str)
|
---|
601 | {
|
---|
602 | return bio_write(bio, str, strlen(str));
|
---|
603 | }
|
---|
604 |
|
---|
605 | static int bio_make_pair(BIO *bio1, BIO *bio2)
|
---|
606 | {
|
---|
607 | struct bio_bio_st *b1, *b2;
|
---|
608 |
|
---|
609 | assert(bio1 != NULL);
|
---|
610 | assert(bio2 != NULL);
|
---|
611 |
|
---|
612 | b1 = bio1->ptr;
|
---|
613 | b2 = bio2->ptr;
|
---|
614 |
|
---|
615 | if (b1->peer != NULL || b2->peer != NULL) {
|
---|
616 | BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);
|
---|
617 | return 0;
|
---|
618 | }
|
---|
619 |
|
---|
620 | if (b1->buf == NULL) {
|
---|
621 | b1->buf = OPENSSL_malloc(b1->size);
|
---|
622 | if (b1->buf == NULL) {
|
---|
623 | BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
|
---|
624 | return 0;
|
---|
625 | }
|
---|
626 | b1->len = 0;
|
---|
627 | b1->offset = 0;
|
---|
628 | }
|
---|
629 |
|
---|
630 | if (b2->buf == NULL) {
|
---|
631 | b2->buf = OPENSSL_malloc(b2->size);
|
---|
632 | if (b2->buf == NULL) {
|
---|
633 | BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
|
---|
634 | return 0;
|
---|
635 | }
|
---|
636 | b2->len = 0;
|
---|
637 | b2->offset = 0;
|
---|
638 | }
|
---|
639 |
|
---|
640 | b1->peer = bio2;
|
---|
641 | b1->closed = 0;
|
---|
642 | b1->request = 0;
|
---|
643 | b2->peer = bio1;
|
---|
644 | b2->closed = 0;
|
---|
645 | b2->request = 0;
|
---|
646 |
|
---|
647 | bio1->init = 1;
|
---|
648 | bio2->init = 1;
|
---|
649 |
|
---|
650 | return 1;
|
---|
651 | }
|
---|
652 |
|
---|
653 | static void bio_destroy_pair(BIO *bio)
|
---|
654 | {
|
---|
655 | struct bio_bio_st *b = bio->ptr;
|
---|
656 |
|
---|
657 | if (b != NULL) {
|
---|
658 | BIO *peer_bio = b->peer;
|
---|
659 |
|
---|
660 | if (peer_bio != NULL) {
|
---|
661 | struct bio_bio_st *peer_b = peer_bio->ptr;
|
---|
662 |
|
---|
663 | assert(peer_b != NULL);
|
---|
664 | assert(peer_b->peer == bio);
|
---|
665 |
|
---|
666 | peer_b->peer = NULL;
|
---|
667 | peer_bio->init = 0;
|
---|
668 | assert(peer_b->buf != NULL);
|
---|
669 | peer_b->len = 0;
|
---|
670 | peer_b->offset = 0;
|
---|
671 |
|
---|
672 | b->peer = NULL;
|
---|
673 | bio->init = 0;
|
---|
674 | assert(b->buf != NULL);
|
---|
675 | b->len = 0;
|
---|
676 | b->offset = 0;
|
---|
677 | }
|
---|
678 | }
|
---|
679 | }
|
---|
680 |
|
---|
681 | /* Exported convenience functions */
|
---|
682 | int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1,
|
---|
683 | BIO **bio2_p, size_t writebuf2)
|
---|
684 | {
|
---|
685 | BIO *bio1 = NULL, *bio2 = NULL;
|
---|
686 | long r;
|
---|
687 | int ret = 0;
|
---|
688 |
|
---|
689 | bio1 = BIO_new(BIO_s_bio());
|
---|
690 | if (bio1 == NULL)
|
---|
691 | goto err;
|
---|
692 | bio2 = BIO_new(BIO_s_bio());
|
---|
693 | if (bio2 == NULL)
|
---|
694 | goto err;
|
---|
695 |
|
---|
696 | if (writebuf1) {
|
---|
697 | r = BIO_set_write_buf_size(bio1, writebuf1);
|
---|
698 | if (!r)
|
---|
699 | goto err;
|
---|
700 | }
|
---|
701 | if (writebuf2) {
|
---|
702 | r = BIO_set_write_buf_size(bio2, writebuf2);
|
---|
703 | if (!r)
|
---|
704 | goto err;
|
---|
705 | }
|
---|
706 |
|
---|
707 | r = BIO_make_bio_pair(bio1, bio2);
|
---|
708 | if (!r)
|
---|
709 | goto err;
|
---|
710 | ret = 1;
|
---|
711 |
|
---|
712 | err:
|
---|
713 | if (ret == 0) {
|
---|
714 | BIO_free(bio1);
|
---|
715 | bio1 = NULL;
|
---|
716 | BIO_free(bio2);
|
---|
717 | bio2 = NULL;
|
---|
718 | }
|
---|
719 |
|
---|
720 | *bio1_p = bio1;
|
---|
721 | *bio2_p = bio2;
|
---|
722 | return ret;
|
---|
723 | }
|
---|
724 |
|
---|
725 | size_t BIO_ctrl_get_write_guarantee(BIO *bio)
|
---|
726 | {
|
---|
727 | return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);
|
---|
728 | }
|
---|
729 |
|
---|
730 | size_t BIO_ctrl_get_read_request(BIO *bio)
|
---|
731 | {
|
---|
732 | return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);
|
---|
733 | }
|
---|
734 |
|
---|
735 | int BIO_ctrl_reset_read_request(BIO *bio)
|
---|
736 | {
|
---|
737 | return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0);
|
---|
738 | }
|
---|
739 |
|
---|
740 | /*
|
---|
741 | * BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now
|
---|
742 | * (conceivably some other BIOs could allow non-copying reads and writes
|
---|
743 | * too.)
|
---|
744 | */
|
---|
745 | int BIO_nread0(BIO *bio, char **buf)
|
---|
746 | {
|
---|
747 | long ret;
|
---|
748 |
|
---|
749 | if (!bio->init) {
|
---|
750 | BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED);
|
---|
751 | return -2;
|
---|
752 | }
|
---|
753 |
|
---|
754 | ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf);
|
---|
755 | if (ret > INT_MAX)
|
---|
756 | return INT_MAX;
|
---|
757 | else
|
---|
758 | return (int)ret;
|
---|
759 | }
|
---|
760 |
|
---|
761 | int BIO_nread(BIO *bio, char **buf, int num)
|
---|
762 | {
|
---|
763 | int ret;
|
---|
764 |
|
---|
765 | if (!bio->init) {
|
---|
766 | BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED);
|
---|
767 | return -2;
|
---|
768 | }
|
---|
769 |
|
---|
770 | ret = (int)BIO_ctrl(bio, BIO_C_NREAD, num, buf);
|
---|
771 | if (ret > 0)
|
---|
772 | bio->num_read += ret;
|
---|
773 | return ret;
|
---|
774 | }
|
---|
775 |
|
---|
776 | int BIO_nwrite0(BIO *bio, char **buf)
|
---|
777 | {
|
---|
778 | long ret;
|
---|
779 |
|
---|
780 | if (!bio->init) {
|
---|
781 | BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED);
|
---|
782 | return -2;
|
---|
783 | }
|
---|
784 |
|
---|
785 | ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf);
|
---|
786 | if (ret > INT_MAX)
|
---|
787 | return INT_MAX;
|
---|
788 | else
|
---|
789 | return (int)ret;
|
---|
790 | }
|
---|
791 |
|
---|
792 | int BIO_nwrite(BIO *bio, char **buf, int num)
|
---|
793 | {
|
---|
794 | int ret;
|
---|
795 |
|
---|
796 | if (!bio->init) {
|
---|
797 | BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED);
|
---|
798 | return -2;
|
---|
799 | }
|
---|
800 |
|
---|
801 | ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf);
|
---|
802 | if (ret > 0)
|
---|
803 | bio->num_write += ret;
|
---|
804 | return ret;
|
---|
805 | }
|
---|