mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
// 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_COMMON_DAEMON_H
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#define OPENVPN_COMMON_DAEMON_H
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#include <fcntl.h>
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#include <unistd.h>
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#include <cstring>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string>
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#include <openvpn/common/types.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/format.hpp>
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#include <openvpn/common/file.hpp>
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namespace openvpn {
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OPENVPN_EXCEPTION(daemon_err);
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inline void redir_std(const std::string& fn, const bool append)
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{
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// open logfile
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const int log = open(fn.c_str(),
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O_CREAT | O_WRONLY | (append ? O_APPEND : O_TRUNC),
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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if (log < 0)
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OPENVPN_THROW(daemon_err, "error opening logfile: " << fn << " : " << std::strerror(errno));
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// redirect stdin to /dev/null
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const int dn = open("/dev/null", O_RDWR, 0);
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if (dn >= 0)
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{
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dup2(dn, 0);
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if (dn > 2)
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close(dn);
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}
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// redirect stdout/stderr to logfile
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dup2(log, 1);
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dup2(log, 2);
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if (log > 2)
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close(log);
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}
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inline void daemonize(const std::string& log_fn, const bool log_append)
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{
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redir_std(log_fn, log_append);
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if (daemon(1, 1) < 0)
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throw daemon_err("daemon() failed");
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}
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inline void write_pid(const std::string& fn)
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{
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write_string(fn, to_string(getpid()) + '\n');
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}
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}
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#endif
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