blob: 2accaaca1eabc011297c95724fb086f8e3beb5e9 [file] [log] [blame]
// Copyright 2017 The Chromium OS 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 <memory>
#include <string>
#include <vector>
#include <base/files/file_path.h>
#include <base/files/scoped_file.h>
#include <base/macros.h>
#include <base/process/process.h>
#include <brillo/files/safe_fd.h>
namespace run_oci {
// A class that redirects stderr/stdout to syslog. It forks another process,
// similar to how logger(1) works.
class SyslogStdioAdapter {
// Creates a fully-initialized instance of SyslogStdioAdapter, or nullptr if
// something failed.
static std::unique_ptr<SyslogStdioAdapter> Create();
explicit SyslogStdioAdapter(base::Process child);
SyslogStdioAdapter(const SyslogStdioAdapter&) = delete;
SyslogStdioAdapter& operator=(const SyslogStdioAdapter&) = delete;
// The child process' run loop. Reads from the stdout/stderr read ends of the
// pipe and logs all lines with INFO/ERROR severity.
// Runs forever until there is an error reading the pipes (e.g. they are both
// closed) or the parent kills it.
static void RunLoop(base::ScopedFD stdout_fd, base::ScopedFD stderr_fd);
// The child process.
base::Process child_;
struct Mountpoint {
base::FilePath path;
int mountflags;
std::string data_string;
bool operator==(const Mountpoint&) const;
// Parses the mount(8) options into mount flags and data string that can be
// understood by mount(2).
std::string ParseMountOptions(const std::vector<std::string>& options,
int* mount_flags_out,
int* negated_mount_flags_out,
int* bind_mount_flags_out,
int* mount_propagation_flags_out,
bool* loopback_out,
std::string* verity_options);
// Returns all mountpoints under |root|.
std::vector<Mountpoint> GetMountpointsUnder(
const base::FilePath& root, const base::FilePath& procSelfMountsPath);
// Returns true if the process has the CAP_SYS_ADMIN capability.
bool HasCapSysAdmin();
// Redirects all logging and stdout/stdio to |log_file|.
bool RedirectLoggingAndStdio(const base::FilePath& log_file);
// A wrapper around pipe(2) that provides base::ScopedFDs.
bool Pipe(base::ScopedFD* read_fd, base::ScopedFD* write_fd, int flags);
// Opens |config_path| for reading with brillo::OpenSafely and returns the FD.
// If |config_path| is not on an exec filesystem, sets errno to EPERM and
// returns an invalid FD.
brillo::SafeFD OpenOciConfigSafely(const base::FilePath& config_path);
// Like OpenOciConfigSafely, but for unittest, allowing callers to control
// whether to check exec filesystem.
brillo::SafeFD OpenOciConfigSafelyForTest(const base::FilePath& config_path,
bool enable_noexec_check);
} // namespace run_oci