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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/impl/tls_connection_posix.h"
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <openssl/ssl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <cstring>
#include <memory>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "absl/types/span.h"
#include "platform/api/task_runner.h"
#include "platform/base/error.h"
#include "platform/impl/stream_socket.h"
#include "util/crypto/openssl_util.h"
#include "util/osp_logging.h"
namespace openscreen {
// TODO(jophba, rwkeane): implement write blocking/unblocking
TlsConnectionPosix::TlsConnectionPosix(IPEndpoint local_address,
TaskRunner* task_runner)
: task_runner_(task_runner),
socket_(std::make_unique<StreamSocketPosix>(local_address)) {
OSP_DCHECK(task_runner_);
}
TlsConnectionPosix::TlsConnectionPosix(IPAddress::Version version,
TaskRunner* task_runner)
: task_runner_(task_runner),
socket_(std::make_unique<StreamSocketPosix>(version)) {
OSP_DCHECK(task_runner_);
}
TlsConnectionPosix::TlsConnectionPosix(std::unique_ptr<StreamSocket> socket,
TaskRunner* task_runner)
: task_runner_(task_runner), socket_(std::move(socket)) {
OSP_DCHECK(task_runner_);
}
TlsConnectionPosix::~TlsConnectionPosix() {
if (platform_client_) {
platform_client_->tls_data_router()->DeregisterConnection(this);
}
// TODO(issuetracker.google.com/169966671): This is only tested by CastSocket
// E2E tests at the moment.
if (ssl_) {
SSL_shutdown(ssl_.get());
}
}
void TlsConnectionPosix::TryReceiveMessage() {
OSP_DCHECK(ssl_);
constexpr int kMaxApplicationDataBytes = 4096;
std::vector<uint8_t> block(kMaxApplicationDataBytes);
ClearOpenSSLERRStack(CURRENT_LOCATION);
const int bytes_read =
SSL_read(ssl_.get(), block.data(), kMaxApplicationDataBytes);
// Read operator was not successful, either due to a closed connection,
// no application data available, an error occurred, or we have to take an
// action.
if (bytes_read <= 0) {
const Error error = GetSSLError(ssl_.get(), bytes_read);
if (!error.ok() && (error != Error::Code::kAgain)) {
DispatchError(error);
}
return;
}
block.resize(bytes_read);
task_runner_->PostTask([weak_this = weak_factory_.GetWeakPtr(),
moved_block = std::move(block)]() mutable {
if (auto* self = weak_this.get()) {
if (auto* client = self->client_) {
client->OnRead(self, std::move(moved_block));
}
}
});
}
void TlsConnectionPosix::SetClient(Client* client) {
OSP_DCHECK(task_runner_->IsRunningOnTaskRunner());
client_ = client;
}
bool TlsConnectionPosix::Send(const void* data, size_t len) {
OSP_DCHECK(task_runner_->IsRunningOnTaskRunner());
return buffer_.Push(data, len);
}
IPEndpoint TlsConnectionPosix::GetRemoteEndpoint() const {
OSP_DCHECK(task_runner_->IsRunningOnTaskRunner());
absl::optional<IPEndpoint> endpoint = socket_->remote_address();
OSP_DCHECK(endpoint.has_value());
return endpoint.value();
}
void TlsConnectionPosix::RegisterConnectionWithDataRouter(
PlatformClientPosix* platform_client) {
OSP_DCHECK(!platform_client_);
platform_client_ = platform_client;
platform_client_->tls_data_router()->RegisterConnection(this);
}
void TlsConnectionPosix::SendAvailableBytes() {
absl::Span<const uint8_t> sendable_bytes = buffer_.GetReadableRegion();
if (sendable_bytes.empty()) {
return;
}
ClearOpenSSLERRStack(CURRENT_LOCATION);
const int result =
SSL_write(ssl_.get(), sendable_bytes.data(), sendable_bytes.size());
if (result <= 0) {
const Error result_error = GetSSLError(ssl_.get(), result);
if (!result_error.ok() && (result_error.code() != Error::Code::kAgain)) {
DispatchError(result_error);
}
} else {
buffer_.Consume(static_cast<size_t>(result));
}
}
void TlsConnectionPosix::DispatchError(Error error) {
task_runner_->PostTask([weak_this = weak_factory_.GetWeakPtr(),
moved_error = std::move(error)]() mutable {
if (auto* self = weak_this.get()) {
if (auto* client = self->client_) {
client->OnError(self, std::move(moved_error));
}
}
});
}
} // namespace openscreen
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