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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_LINUX_DAEMON_ALIVE_H
#define OPENVPN_LINUX_DAEMON_ALIVE_H
#include <openvpn/common/file.hpp>
#include <openvpn/common/string.hpp>
#include <openvpn/common/number.hpp>
namespace openvpn {
inline int daemon_pid(const std::string &cmd,
const std::string &pidfile)
{
try
{
std::string pidstr = read_text(pidfile);
string::trim_crlf(pidstr);
const std::string cmdline_fn = "/proc/" + pidstr + "/cmdline";
BufferPtr cmdbuf = read_binary_linear(cmdline_fn);
const size_t len = ::strnlen((const char *)cmdbuf->c_data(), cmdbuf->size());
if (cmd == std::string((const char *)cmdbuf->c_data(), len))
{
int ret;
if (parse_number(pidstr, ret))
return ret;
}
}
catch (const std::exception &e)
{
}
return -1;
}
inline bool is_daemon_alive(const std::string &cmd,
const std::string &pidfile)
{
return daemon_pid(cmd, pidfile) >= 0;
}
} // namespace openvpn
#endif
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