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// Copyright (c) 2012 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 "chromeos/dbus/permission_broker_client.h"
#include <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
using permission_broker::kCheckPathAccess;
using permission_broker::kOpenPath;
using permission_broker::kPermissionBrokerInterface;
using permission_broker::kPermissionBrokerServiceName;
using permission_broker::kPermissionBrokerServicePath;
using permission_broker::kReleaseTcpPort;
using permission_broker::kReleaseUdpPort;
using permission_broker::kRequestTcpPortAccess;
using permission_broker::kRequestUdpPortAccess;
namespace chromeos {
namespace {
const char kNoResponseError[] = "org.chromium.Error.NoResponse";
}
class PermissionBrokerClientImpl : public PermissionBrokerClient {
public:
PermissionBrokerClientImpl() : proxy_(NULL), weak_ptr_factory_(this) {}
void CheckPathAccess(const std::string& path,
const ResultCallback& callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kCheckPathAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void OpenPath(const std::string& path,
const OpenPathCallback& callback,
const ErrorCallback& error_callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kOpenPath);
dbus::MessageWriter writer(&method_call);
writer.AppendString(path);
proxy_->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnOpenPathResponse,
weak_ptr_factory_.GetWeakPtr(), callback),
base::Bind(&PermissionBrokerClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(), error_callback));
}
void RequestTcpPortAccess(uint16_t port,
const std::string& interface,
const dbus::FileDescriptor& lifeline_fd,
const ResultCallback& callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestTcpPortAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void RequestUdpPortAccess(uint16_t port,
const std::string& interface,
const dbus::FileDescriptor& lifeline_fd,
const ResultCallback& callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface,
kRequestUdpPortAccess);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
writer.AppendFileDescriptor(lifeline_fd);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void ReleaseTcpPort(uint16_t port,
const std::string& interface,
const ResultCallback& callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kReleaseTcpPort);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), callback));
}
void ReleaseUdpPort(uint16_t port,
const std::string& interface,
const ResultCallback& callback) override {
dbus::MethodCall method_call(kPermissionBrokerInterface, kReleaseUdpPort);
dbus::MessageWriter writer(&method_call);
writer.AppendUint16(port);
writer.AppendString(interface);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&PermissionBrokerClientImpl::OnResponse,
weak_ptr_factory_.GetWeakPtr(), callback));
}
protected:
void Init(dbus::Bus* bus) override {
proxy_ =
bus->GetObjectProxy(kPermissionBrokerServiceName,
dbus::ObjectPath(kPermissionBrokerServicePath));
}
private:
// Handle a DBus response from the permission broker, invoking the callback
// that the method was originally called with with the success response.
void OnResponse(const ResultCallback& callback, dbus::Response* response) {
if (!response) {
LOG(WARNING) << "Access request method call failed.";
callback.Run(false);
return;
}
bool result = false;
dbus::MessageReader reader(response);
if (!reader.PopBool(&result))
LOG(WARNING) << "Could not parse response: " << response->ToString();
callback.Run(result);
}
void OnOpenPathResponse(const OpenPathCallback& callback,
dbus::Response* response) {
dbus::FileDescriptor fd;
dbus::MessageReader reader(response);
if (!reader.PopFileDescriptor(&fd))
LOG(WARNING) << "Could not parse response: " << response->ToString();
callback.Run(std::move(fd));
}
void OnError(const ErrorCallback& callback, dbus::ErrorResponse* response) {
std::string error_name;
std::string error_message;
if (response) {
dbus::MessageReader reader(response);
error_name = response->GetErrorName();
reader.PopString(&error_message);
} else {
error_name = kNoResponseError;
}
callback.Run(error_name, error_message);
}
dbus::ObjectProxy* proxy_;
// Note: This should remain the last member so that it will be destroyed
// first, invalidating its weak pointers, before the other members are
// destroyed.
base::WeakPtrFactory<PermissionBrokerClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PermissionBrokerClientImpl);
};
PermissionBrokerClient::PermissionBrokerClient() {}
PermissionBrokerClient::~PermissionBrokerClient() {}
PermissionBrokerClient* PermissionBrokerClient::Create() {
return new PermissionBrokerClientImpl();
}
} // namespace chromeos
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