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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 <sys/resource.h>
#include <sys/types.h>
#include <optional>
#include <string>
#include <vector>
#include <android-base/unique_fd.h>
#include <cutils/iosched_policy.h>
#include "interprocess_fifo.h"
#include "mount_namespace.h"
#include "result.h"
namespace android {
namespace init {
// Constants used by Service::Start() for communication between parent and child.
enum ServiceCode : uint8_t {
kActivatingCgroupsFailed,
kCgroupsActivated,
kSetSidFinished,
};
class Descriptor {
public:
Descriptor(const std::string& name, android::base::unique_fd fd)
: name_(name), fd_(std::move(fd)){};
// Publish() unsets FD_CLOEXEC from the FD and publishes its name via setenv(). It should be
// called when starting a service after fork() and before exec().
void Publish() const;
private:
std::string name_;
android::base::unique_fd fd_;
};
struct SocketDescriptor {
std::string name;
int type = 0;
uid_t uid = 0;
gid_t gid = 0;
int perm = 0;
std::string context;
bool passcred = false;
bool listen = false;
bool persist = false;
// Create() creates the named unix domain socket in /dev/socket and returns a Descriptor object.
// It should be called when starting a service, before calling fork(), such that the socket is
// synchronously created before starting any other services, which may depend on it.
Result<Descriptor> Create(const std::string& global_context) const;
};
struct FileDescriptor {
std::string name;
std::string type;
Result<Descriptor> Create() const;
};
struct NamespaceInfo {
int flags;
// Pair of namespace type, path to name.
std::vector<std::pair<int, std::string>> namespaces_to_enter;
};
Result<void> EnterNamespaces(const NamespaceInfo& info, const std::string& name,
std::optional<MountNamespace> override_mount_namespace);
struct ProcessAttributes {
std::string console;
IoSchedClass ioprio_class;
int ioprio_pri;
std::vector<std::pair<int, rlimit>> rlimits;
std::optional<uid_t> parsed_uid;
gid_t gid;
std::vector<gid_t> supp_gids;
int priority;
bool stdio_to_kmsg;
uid_t uid() const { return parsed_uid.value_or(0); }
};
inline bool RequiresConsole(const ProcessAttributes& attr) {
return !attr.console.empty();
}
Result<void> SetProcessAttributes(const ProcessAttributes& attr, InterprocessFifo setsid_finished);
Result<void> WritePidToFiles(std::vector<std::string>* files);
} // namespace init
} // namespace android
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