101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
// Copyright 2015 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <brillo/streams/openssl_stream_bio.h>
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#include <openssl/bio.h>
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#include <base/numerics/safe_conversions.h>
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#include <brillo/streams/stream.h>
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namespace brillo {
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namespace {
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// Internal functions for implementing OpenSSL BIO on brillo::Stream.
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int stream_write(BIO* bio, const char* buf, int size) {
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brillo::Stream* stream = static_cast<brillo::Stream*>(bio->ptr);
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size_t written = 0;
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BIO_clear_retry_flags(bio);
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if (!stream->WriteNonBlocking(buf, size, &written, nullptr))
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return -1;
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if (written == 0) {
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// Socket's output buffer is full, try again later.
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BIO_set_retry_write(bio);
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return -1;
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}
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return base::checked_cast<int>(written);
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}
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int stream_read(BIO* bio, char* buf, int size) {
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brillo::Stream* stream = static_cast<brillo::Stream*>(bio->ptr);
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size_t read = 0;
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BIO_clear_retry_flags(bio);
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bool eos = false;
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if (!stream->ReadNonBlocking(buf, size, &read, &eos, nullptr))
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return -1;
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if (read == 0 && !eos) {
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// If no data is available on the socket and it is still not closed,
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// ask OpenSSL to try again later.
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BIO_set_retry_read(bio);
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return -1;
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}
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return base::checked_cast<int>(read);
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}
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// NOLINTNEXTLINE(runtime/int)
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long stream_ctrl(BIO* bio, int cmd, long /* num */, void* /* ptr */) {
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if (cmd == BIO_CTRL_FLUSH) {
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brillo::Stream* stream = static_cast<brillo::Stream*>(bio->ptr);
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return stream->FlushBlocking(nullptr) ? 1 : 0;
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}
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return 0;
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}
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int stream_new(BIO* bio) {
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bio->shutdown = 0; // By default do not close underlying stream on shutdown.
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bio->init = 0;
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bio->num = -1; // not used.
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return 1;
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}
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int stream_free(BIO* bio) {
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if (!bio)
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return 0;
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if (bio->init) {
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bio->ptr = nullptr;
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bio->init = 0;
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}
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return 1;
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}
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// BIO_METHOD structure describing the BIO built on top of brillo::Stream.
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BIO_METHOD stream_method = {
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0x7F | BIO_TYPE_SOURCE_SINK, // type: 0x7F is an arbitrary unused type ID.
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"stream", // name
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stream_write, // write function
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stream_read, // read function
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nullptr, // puts function, not implemented
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nullptr, // gets function, not implemented
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stream_ctrl, // control function
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stream_new, // creation
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stream_free, // free
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nullptr, // callback function, not used
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};
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} // anonymous namespace
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BIO* BIO_new_stream(brillo::Stream* stream) {
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BIO* bio = BIO_new(&stream_method);
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if (bio) {
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bio->ptr = stream;
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bio->init = 1;
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}
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return bio;
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}
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} // namespace brillo
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