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https://github.com/OpenVPN/openvpn3.git
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Added linux-specific is_daemon_alive() function to determine
if a particular daemon is running.
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47
openvpn/linux/daemon_alive.hpp
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47
openvpn/linux/daemon_alive.hpp
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// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2015 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_LINUX_DAEMON_ALIVE_H
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#define OPENVPN_LINUX_DAEMON_ALIVE_H
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#include <openvpn/common/file.hpp>
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#include <openvpn/common/string.hpp>
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namespace openvpn {
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inline bool is_daemon_alive(const std::string& cmd,
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const std::string& pidfile)
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{
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try {
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std::string pidstr = read_text(pidfile);
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string::trim_crlf(pidstr);
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const std::string cmdline_fn = "/proc/" + pidstr + "/cmdline";
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BufferPtr cmdbuf = read_binary_linear(cmdline_fn);
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const size_t len = ::strnlen((const char *)cmdbuf->c_data(), cmdbuf->size());
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return cmd == std::string((const char *)cmdbuf->c_data(), len);
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}
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catch (const std::exception& e)
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{
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return false;
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}
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}
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}
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#endif
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