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// Copyright 2016 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 "mojo/edk/system/mach_port_relay.h"
#include <mach/mach.h>
#include <utility>
#include "base/logging.h"
#include "base/mac/mach_port_util.h"
#include "base/mac/scoped_mach_port.h"
#include "base/process/process.h"
#include "mojo/edk/embedder/platform_handle_vector.h"
namespace mojo {
namespace edk {
// static
bool MachPortRelay::ReceivePorts(PlatformHandleVector* handles) {
DCHECK(handles);
for (size_t i = 0; i < handles->size(); i++) {
PlatformHandle* handle = handles->data() + i;
DCHECK(handle->type != PlatformHandle::Type::MACH);
if (handle->type != PlatformHandle::Type::MACH_NAME)
continue;
base::mac::ScopedMachReceiveRight message_port(handle->port);
base::mac::ScopedMachSendRight received_port(
base::ReceiveMachPort(message_port.get()));
if (received_port.get() == MACH_PORT_NULL) {
handle->port = MACH_PORT_NULL;
LOG(ERROR) << "Error receiving mach port";
return false;
}
handle->port = received_port.release();
handle->type = PlatformHandle::Type::MACH;
}
return true;
}
MachPortRelay::MachPortRelay(base::PortProvider* port_provider)
: port_provider_(port_provider) {
DCHECK(port_provider);
port_provider_->AddObserver(this);
}
MachPortRelay::~MachPortRelay() {
port_provider_->RemoveObserver(this);
}
bool MachPortRelay::SendPortsToProcess(Channel::Message* message,
base::ProcessHandle process) {
DCHECK(message);
mach_port_t task_port = port_provider_->TaskForPid(process);
if (task_port == MACH_PORT_NULL)
return false;
size_t num_sent = 0;
bool error = false;
ScopedPlatformHandleVectorPtr handles = message->TakeHandles();
// Message should have handles, otherwise there's no point in calling this
// function.
DCHECK(handles);
for (size_t i = 0; i < handles->size(); i++) {
PlatformHandle* handle = &(*handles)[i];
DCHECK(handle->type != PlatformHandle::Type::MACH_NAME);
if (handle->type != PlatformHandle::Type::MACH)
continue;
mach_port_name_t intermediate_port;
DCHECK(handle->port != MACH_PORT_NULL);
intermediate_port = base::CreateIntermediateMachPort(
task_port, base::mac::ScopedMachSendRight(handle->port), nullptr);
if (intermediate_port == MACH_PORT_NULL) {
handle->port = MACH_PORT_NULL;
error = true;
break;
}
handle->port = intermediate_port;
handle->type = PlatformHandle::Type::MACH_NAME;
num_sent++;
}
DCHECK(error || num_sent);
message->SetHandles(std::move(handles));
return !error;
}
bool MachPortRelay::ExtractPortRights(Channel::Message* message,
base::ProcessHandle process) {
DCHECK(message);
mach_port_t task_port = port_provider_->TaskForPid(process);
if (task_port == MACH_PORT_NULL)
return false;
size_t num_received = 0;
bool error = false;
ScopedPlatformHandleVectorPtr handles = message->TakeHandles();
// Message should have handles, otherwise there's no point in calling this
// function.
DCHECK(handles);
for (size_t i = 0; i < handles->size(); i++) {
PlatformHandle* handle = handles->data() + i;
DCHECK(handle->type != PlatformHandle::Type::MACH);
if (handle->type != PlatformHandle::Type::MACH_NAME)
continue;
mach_port_t extracted_right = MACH_PORT_NULL;
mach_msg_type_name_t extracted_right_type;
kern_return_t kr =
mach_port_extract_right(task_port, handle->port,
MACH_MSG_TYPE_MOVE_SEND,
&extracted_right, &extracted_right_type);
if (kr != KERN_SUCCESS) {
error = true;
break;
}
DCHECK_EQ(static_cast<mach_msg_type_name_t>(MACH_MSG_TYPE_PORT_SEND),
extracted_right_type);
handle->port = extracted_right;
handle->type = PlatformHandle::Type::MACH;
num_received++;
}
DCHECK(error || num_received);
message->SetHandles(std::move(handles));
return !error;
}
void MachPortRelay::AddObserver(Observer* observer) {
base::AutoLock locker(observers_lock_);
bool inserted = observers_.insert(observer).second;
DCHECK(inserted);
}
void MachPortRelay::RemoveObserver(Observer* observer) {
base::AutoLock locker(observers_lock_);
observers_.erase(observer);
}
void MachPortRelay::OnReceivedTaskPort(base::ProcessHandle process) {
base::AutoLock locker(observers_lock_);
for (const auto observer : observers_)
observer->OnProcessReady(process);
}
} // namespace edk
} // namespace mojo
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