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content / browser / devtools / protocol / tethering_handler.cc [blame]
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/devtools/protocol/tethering_handler.h"
#include <map>
#include <memory>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/task/single_thread_task_runner.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_address.h"
#include "net/base/net_errors.h"
#include "net/log/net_log_source.h"
#include "net/socket/server_socket.h"
#include "net/socket/stream_socket.h"
#include "net/socket/tcp_server_socket.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace content {
namespace protocol {
using BindCallback = Tethering::Backend::BindCallback;
using UnbindCallback = Tethering::Backend::UnbindCallback;
namespace {
const int kListenBacklog = 5;
const int kSocketPumpBufferSize = 16 * 1024;
const int kMinTetheringPort = 1024;
const int kMaxTetheringPort = 65535;
const net::NetworkTrafficAnnotationTag kTrafficAnnotation =
net::DefineNetworkTrafficAnnotation("tethering_handler_socket", R"(
semantics {
sender: "Tethering Handler"
description:
"For remote debugging local Android device, one might need to "
"enable reverse tethering for forwarding local ports from the "
"device to some ports on the host. This socket pumps the traffic "
"between the two."
trigger:
"A user connects to an Android device using remote debugging and "
"enables port forwarding on chrome://inspect."
data: "Any data requested from the local port on Android device."
destination: OTHER
destination_other:
"Data is sent to the target that user selects in chrome://inspect."
}
policy {
cookies_allowed: YES
cookies_store: "user"
setting:
"This request cannot be disabled in settings, however it would be "
"sent only if user enables port fowarding in chrome://inspect and "
"USB debugging in the Android device system settings."
policy_exception_justification:
"Not implemented, policies defined on Android device will apply "
"here."
})");
using CreateServerSocketCallback = TetheringHandler::CreateServerSocketCallback;
class SocketPump {
public:
SocketPump(net::StreamSocket* client_socket)
: client_socket_(client_socket),
pending_writes_(0),
pending_destruction_(false) {
}
std::string Init(CreateServerSocketCallback socket_callback) {
std::string channel_name;
server_socket_ = std::move(socket_callback).Run(&channel_name);
if (!server_socket_.get() || channel_name.empty()) {
SelfDestruct();
return std::string();
}
int result = server_socket_->Accept(
&accepted_socket_,
base::BindOnce(&SocketPump::OnAccepted, base::Unretained(this)));
if (result != net::ERR_IO_PENDING)
OnAccepted(result);
return channel_name;
}
private:
void OnAccepted(int result) {
if (result < 0) {
SelfDestruct();
return;
}
++pending_writes_; // avoid SelfDestruct in first Pump
Pump(client_socket_.get(), accepted_socket_.get());
--pending_writes_;
if (pending_destruction_) {
SelfDestruct();
} else {
Pump(accepted_socket_.get(), client_socket_.get());
}
}
void Pump(net::StreamSocket* from, net::StreamSocket* to) {
auto buffer =
base::MakeRefCounted<net::IOBufferWithSize>(kSocketPumpBufferSize);
int result =
from->Read(buffer.get(), kSocketPumpBufferSize,
base::BindOnce(&SocketPump::OnRead, base::Unretained(this),
from, to, buffer));
if (result != net::ERR_IO_PENDING)
OnRead(from, to, buffer, result);
}
void OnRead(net::StreamSocket* from,
net::StreamSocket* to,
scoped_refptr<net::IOBuffer> buffer,
int result) {
if (result <= 0) {
SelfDestruct();
return;
}
int total = result;
scoped_refptr<net::DrainableIOBuffer> drainable =
base::MakeRefCounted<net::DrainableIOBuffer>(std::move(buffer), total);
++pending_writes_;
result =
to->Write(drainable.get(), total,
base::BindOnce(&SocketPump::OnWritten, base::Unretained(this),
drainable, from, to),
kTrafficAnnotation);
if (result != net::ERR_IO_PENDING)
OnWritten(drainable, from, to, result);
}
void OnWritten(scoped_refptr<net::DrainableIOBuffer> drainable,
net::StreamSocket* from,
net::StreamSocket* to,
int result) {
--pending_writes_;
if (result < 0) {
SelfDestruct();
return;
}
drainable->DidConsume(result);
if (drainable->BytesRemaining() > 0) {
++pending_writes_;
result =
to->Write(drainable.get(), drainable->BytesRemaining(),
base::BindOnce(&SocketPump::OnWritten,
base::Unretained(this), drainable, from, to),
kTrafficAnnotation);
if (result != net::ERR_IO_PENDING)
OnWritten(drainable, from, to, result);
return;
}
if (pending_destruction_) {
SelfDestruct();
return;
}
Pump(from, to);
}
void SelfDestruct() {
if (pending_writes_ > 0) {
pending_destruction_ = true;
return;
}
delete this;
}
private:
std::unique_ptr<net::StreamSocket> client_socket_;
std::unique_ptr<net::ServerSocket> server_socket_;
std::unique_ptr<net::StreamSocket> accepted_socket_;
int pending_writes_;
bool pending_destruction_;
};
class BoundSocket {
public:
// Called from BoundSocket each time an incoming connection is successfully
// accepted, if the connection name given from the |socket_callback| is not
// empty.
using AcceptedCallback =
base::RepeatingCallback<void(uint16_t, const std::string&)>;
BoundSocket(AcceptedCallback accepted_callback,
const CreateServerSocketCallback& socket_callback)
: accepted_callback_(accepted_callback),
socket_callback_(socket_callback),
socket_(new net::TCPServerSocket(nullptr, net::NetLogSource())),
port_(0) {}
virtual ~BoundSocket() {
}
bool Listen(uint16_t port) {
port_ = port;
net::IPEndPoint end_point(net::IPAddress::IPv4Localhost(), port);
int result =
socket_->Listen(end_point, kListenBacklog, /*ipv6_only=*/std::nullopt);
if (result < 0)
return false;
net::IPEndPoint local_address;
result = socket_->GetLocalAddress(&local_address);
if (result < 0)
return false;
DoAccept();
return true;
}
private:
typedef std::map<net::IPEndPoint, net::StreamSocket*> AcceptedSocketsMap;
void DoAccept() {
while (true) {
int result = socket_->Accept(
&accept_socket_,
base::BindOnce(&BoundSocket::OnAccepted, base::Unretained(this)));
if (result == net::ERR_IO_PENDING)
break;
else
HandleAcceptResult(result);
}
}
void OnAccepted(int result) {
HandleAcceptResult(result);
if (result == net::OK)
DoAccept();
}
void HandleAcceptResult(int result) {
if (result != net::OK)
return;
SocketPump* pump = new SocketPump(accept_socket_.release());
std::string name = pump->Init(socket_callback_);
if (!name.empty())
accepted_callback_.Run(port_, name);
}
AcceptedCallback accepted_callback_;
CreateServerSocketCallback socket_callback_;
std::unique_ptr<net::ServerSocket> socket_;
std::unique_ptr<net::StreamSocket> accept_socket_;
uint16_t port_;
};
} // namespace
// TetheringHandler::TetheringImpl -------------------------------------------
class TetheringHandler::TetheringImpl {
public:
TetheringImpl(base::WeakPtr<TetheringHandler> handler,
CreateServerSocketCallback socket_callback);
~TetheringImpl();
void Bind(uint16_t port, std::unique_ptr<BindCallback> callback);
void Unbind(uint16_t port, std::unique_ptr<UnbindCallback> callback);
void Accepted(uint16_t port, const std::string& name);
private:
base::WeakPtr<TetheringHandler> handler_;
CreateServerSocketCallback socket_callback_;
std::map<uint16_t, std::unique_ptr<BoundSocket>> bound_sockets_;
};
TetheringHandler::TetheringImpl::TetheringImpl(
base::WeakPtr<TetheringHandler> handler,
CreateServerSocketCallback socket_callback)
: handler_(handler), socket_callback_(std::move(socket_callback)) {}
TetheringHandler::TetheringImpl::~TetheringImpl() = default;
void TetheringHandler::TetheringImpl::Bind(
uint16_t port, std::unique_ptr<BindCallback> callback) {
if (base::Contains(bound_sockets_, port)) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&BindCallback::sendFailure, std::move(callback),
Response::ServerError("Port already bound")));
return;
}
BoundSocket::AcceptedCallback accepted_callback = base::BindRepeating(
&TetheringHandler::TetheringImpl::Accepted, base::Unretained(this));
std::unique_ptr<BoundSocket> bound_socket = std::make_unique<BoundSocket>(
std::move(accepted_callback), socket_callback_);
if (!bound_socket->Listen(port)) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&BindCallback::sendFailure, std::move(callback),
Response::ServerError("Could not bind port")));
return;
}
bound_sockets_[port] = std::move(bound_socket);
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&BindCallback::sendSuccess, std::move(callback)));
}
void TetheringHandler::TetheringImpl::Unbind(
uint16_t port, std::unique_ptr<UnbindCallback> callback) {
auto it = bound_sockets_.find(port);
if (it == bound_sockets_.end()) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&UnbindCallback::sendFailure, std::move(callback),
Response::InvalidParams("Port is not bound")));
return;
}
bound_sockets_.erase(it);
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&UnbindCallback::sendSuccess, std::move(callback)));
}
void TetheringHandler::TetheringImpl::Accepted(uint16_t port,
const std::string& name) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&TetheringHandler::Accepted, handler_, port, name));
}
// TetheringHandler ----------------------------------------------------------
// static
TetheringHandler::TetheringImpl* TetheringHandler::impl_ = nullptr;
TetheringHandler::TetheringHandler(
CreateServerSocketCallback socket_callback,
scoped_refptr<base::SingleThreadTaskRunner> task_runner)
: DevToolsDomainHandler(Tethering::Metainfo::domainName),
socket_callback_(std::move(socket_callback)),
task_runner_(task_runner),
is_active_(false) {}
TetheringHandler::~TetheringHandler() {
if (is_active_) {
task_runner_->DeleteSoon(FROM_HERE, impl_);
impl_ = nullptr;
}
}
void TetheringHandler::Wire(UberDispatcher* dispatcher) {
frontend_ = std::make_unique<Tethering::Frontend>(dispatcher->channel());
Tethering::Dispatcher::wire(dispatcher, this);
}
void TetheringHandler::Accepted(uint16_t port, const std::string& name) {
frontend_->Accepted(port, name);
}
bool TetheringHandler::Activate() {
if (is_active_)
return true;
if (impl_)
return false;
is_active_ = true;
impl_ = new TetheringImpl(weak_factory_.GetWeakPtr(), socket_callback_);
return true;
}
void TetheringHandler::Bind(
int port, std::unique_ptr<BindCallback> callback) {
if (port < kMinTetheringPort || port > kMaxTetheringPort) {
callback->sendFailure(Response::InvalidParams("port"));
return;
}
if (!Activate()) {
callback->sendFailure(
Response::ServerError("Tethering is used by another connection"));
return;
}
DCHECK(impl_);
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&TetheringImpl::Bind, base::Unretained(impl_),
port, std::move(callback)));
}
void TetheringHandler::Unbind(
int port, std::unique_ptr<UnbindCallback> callback) {
if (!Activate()) {
callback->sendFailure(
Response::ServerError("Tethering is used by another connection"));
return;
}
DCHECK(impl_);
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&TetheringImpl::Unbind, base::Unretained(impl_),
port, std::move(callback)));
}
} // namespace protocol
} // namespace content