[331] | 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 | */
|
---|
| 464 | bio_destroy_pair(bio);
|
---|
| 465 | ret = 1;
|
---|
| 466 | break;
|
---|
| 467 |
|
---|
| 468 | case BIO_C_GET_WRITE_GUARANTEE:
|
---|
| 469 | /*
|
---|
| 470 | * How many bytes can the caller feed to the next write without
|
---|
| 471 | * having to keep any?
|
---|
| 472 | */
|
---|
| 473 | if (b->peer == NULL || b->closed)
|
---|
| 474 | ret = 0;
|
---|
| 475 | else
|
---|
| 476 | ret = (long)b->size - b->len;
|
---|
| 477 | break;
|
---|
| 478 |
|
---|
| 479 | case BIO_C_GET_READ_REQUEST:
|
---|
| 480 | /*
|
---|
| 481 | * If the peer unsuccessfully tried to read, how many bytes were
|
---|
| 482 | * requested? (As with BIO_CTRL_PENDING, that number can usually be
|
---|
| 483 | * treated as boolean.)
|
---|
| 484 | */
|
---|
| 485 | ret = (long)b->request;
|
---|
| 486 | break;
|
---|
| 487 |
|
---|
| 488 | case BIO_C_RESET_READ_REQUEST:
|
---|
| 489 | /*
|
---|
| 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 | }
|
---|