2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "async_bio.h"
15 #include <openssl/bio.h>
16 #include <openssl/crypto.h>
23 bool enforce_write_quota;
28 AsyncBio *GetData(BIO *bio) {
29 return (AsyncBio *)BIO_get_data(bio);
32 static int AsyncWrite(BIO *bio, const char *in, int inl) {
33 AsyncBio *a = GetData(bio);
34 if (a == NULL || BIO_next(bio) == NULL) {
38 if (!a->enforce_write_quota) {
39 return BIO_write(BIO_next(bio), in, inl);
42 BIO_clear_retry_flags(bio);
44 if (a->write_quota == 0) {
45 BIO_set_retry_write(bio);
50 if (!a->datagram && (size_t)inl > a->write_quota) {
53 int ret = BIO_write(BIO_next(bio), in, inl);
55 BIO_copy_next_retry(bio);
57 a->write_quota -= (a->datagram ? 1 : ret);
62 static int AsyncRead(BIO *bio, char *out, int outl) {
63 AsyncBio *a = GetData(bio);
64 if (a == NULL || BIO_next(bio) == NULL) {
68 BIO_clear_retry_flags(bio);
70 if (a->read_quota == 0) {
71 BIO_set_retry_read(bio);
76 if (!a->datagram && (size_t)outl > a->read_quota) {
79 int ret = BIO_read(BIO_next(bio), out, outl);
81 BIO_copy_next_retry(bio);
83 a->read_quota -= (a->datagram ? 1 : ret);
88 static long AsyncCtrl(BIO *bio, int cmd, long num, void *ptr) {
89 if (BIO_next(bio) == NULL) {
92 BIO_clear_retry_flags(bio);
93 int ret = BIO_ctrl(BIO_next(bio), cmd, num, ptr);
94 BIO_copy_next_retry(bio);
98 static int AsyncNew(BIO *bio) {
99 AsyncBio *a = (AsyncBio *)OPENSSL_malloc(sizeof(*a));
103 memset(a, 0, sizeof(*a));
104 a->enforce_write_quota = true;
105 BIO_set_init(bio, 1);
106 BIO_set_data(bio, a);
110 static int AsyncFree(BIO *bio) {
115 OPENSSL_free(BIO_get_data(bio));
116 BIO_set_data(bio, NULL);
117 BIO_set_init(bio, 0);
121 static long AsyncCallbackCtrl(BIO *bio, int cmd, BIO_info_cb fp)
123 if (BIO_next(bio) == NULL)
125 return BIO_callback_ctrl(BIO_next(bio), cmd, fp);
128 static BIO_METHOD *g_async_bio_method = NULL;
130 static const BIO_METHOD *AsyncMethod(void)
132 if (g_async_bio_method == NULL) {
133 g_async_bio_method = BIO_meth_new(BIO_TYPE_FILTER, "async bio");
134 if ( g_async_bio_method == NULL
135 || !BIO_meth_set_write(g_async_bio_method, AsyncWrite)
136 || !BIO_meth_set_read(g_async_bio_method, AsyncRead)
137 || !BIO_meth_set_ctrl(g_async_bio_method, AsyncCtrl)
138 || !BIO_meth_set_create(g_async_bio_method, AsyncNew)
139 || !BIO_meth_set_destroy(g_async_bio_method, AsyncFree)
140 || !BIO_meth_set_callback_ctrl(g_async_bio_method, AsyncCallbackCtrl))
143 return g_async_bio_method;
148 bssl::UniquePtr<BIO> AsyncBioCreate() {
149 return bssl::UniquePtr<BIO>(BIO_new(AsyncMethod()));
152 bssl::UniquePtr<BIO> AsyncBioCreateDatagram() {
153 bssl::UniquePtr<BIO> ret(BIO_new(AsyncMethod()));
157 GetData(ret.get())->datagram = true;
161 void AsyncBioAllowRead(BIO *bio, size_t count) {
162 AsyncBio *a = GetData(bio);
166 a->read_quota += count;
169 void AsyncBioAllowWrite(BIO *bio, size_t count) {
170 AsyncBio *a = GetData(bio);
174 a->write_quota += count;
177 void AsyncBioEnforceWriteQuota(BIO *bio, bool enforce) {
178 AsyncBio *a = GetData(bio);
182 a->enforce_write_quota = enforce;