/*
* Copyright (C) 2018 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3, as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see .
*
*/
#include "anbox/common/binder_device_allocator.h"
#include "anbox/common/binder_device.h"
#include "anbox/common/binderfs.h"
#include "anbox/defer_action.h"
#include "anbox/logger.h"
#include "anbox/utils.h"
#include
#include
#include
#include
#include
#include
namespace fs = boost::filesystem;
namespace {
const constexpr char* binderfs_base_path{BINDERFS_PATH};
const constexpr char* binderfs_control_path{BINDERFS_PATH "/binder-control"};
const constexpr char* default_binder_device_name{"binder"};
} // namespace
namespace anbox {
namespace common {
bool BinderDeviceAllocator::is_supported() {
return fs::exists(binderfs_control_path);
}
std::unique_ptr BinderDeviceAllocator::new_device() {
static uint32_t next_id = 0;
const auto ctl_fd = ::open(binderfs_control_path, O_RDWR);
if (ctl_fd < 0) {
ERROR("Failed to access binder control: %s", std::strerror(errno));
return nullptr;
}
DeferAction close_ctl_fd{[&]() { ::close(ctl_fd); }};
binderfs_device dev;
std::memset(&dev, 0, sizeof(binderfs_device));
const auto device_name = utils::string_format("%s%d", default_binder_device_name, next_id++);
if (device_name.length() > BINDERFS_MAX_NAME) {
ERROR("Invalid binder device name: %s", device_name);
return nullptr;
}
std::memcpy(dev.name, device_name.c_str(), device_name.length());
if (::ioctl(ctl_fd, BINDER_CTL_ADD, &dev) < 0) {
ERROR("Failed to allocate new binder node: %s", std::strerror(errno));
return nullptr;
}
const auto path = utils::string_format("%s/%s", binderfs_base_path, device_name);
if (!fs::exists(path)) {
ERROR("Allocated binder device %s is missing", path);
return nullptr;
}
return BinderDevice::create(path);
}
} // namespace common
} // namespace anbox