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/*
* Copyright (c) 2017 Facebook, Inc.
* Copyright (c) 2017 VMware, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <memory>
#include "file_desc.h"
class ProcMountNSGuard;
// ProcMountNS opens an fd corresponding to the current mount namespace and the
// mount namespace of the target process.
// The fds will remain uninitialized (<0) if the open fails, or if the current
// and target namespaces are identical.
class ProcMountNS {
public:
explicit ProcMountNS(int pid);
int self() const { return self_fd_; }
int target() const { return target_fd_; }
ino_t target_ino() const { return target_ino_; }
private:
ebpf::FileDesc self_fd_;
ebpf::FileDesc target_fd_;
ino_t target_ino_;
};
// ProcMountNSGuard switches to the target mount namespace and restores the
// original upon going out of scope.
class ProcMountNSGuard {
public:
explicit ProcMountNSGuard(ProcMountNS *mount_ns);
explicit ProcMountNSGuard(int pid);
~ProcMountNSGuard();
private:
void init();
std::unique_ptr<ProcMountNS> mount_ns_instance_;
ProcMountNS *mount_ns_;
bool entered_;
};
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