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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) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_COMMON_DAEMON_H
#define OPENVPN_COMMON_DAEMON_H
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/to_string.hpp>
#include <openvpn/common/file.hpp>
#include <openvpn/common/logrotate.hpp>
#include <openvpn/common/redir.hpp>
#include <openvpn/common/usergroup.hpp>
#include <openvpn/common/logsetup.hpp>
namespace openvpn {
OPENVPN_EXCEPTION(daemon_err);
class LogReopen : public LogSetup
{
public:
LogReopen(const std::string &log_fn,
const bool combine_out_err)
: log_fn_(log_fn),
combine_out_err_(combine_out_err)
{
}
virtual void reopen() override
{
try
{
// open redirection log file, but don't redirect yet
RedirectStd redir(std::string(),
log_fn_,
RedirectStd::FLAGS_APPEND,
RedirectStd::MODE_USER_GROUP,
combine_out_err_);
// now do the redirect
redir.redirect();
}
catch (const std::exception &e)
{
std::cerr << "LogReopen: " << e.what() << std::endl;
}
}
private:
const std::string log_fn_;
const bool combine_out_err_;
};
inline LogSetup::Ptr log_setup(const std::string &log_fn,
const SetUserGroup *user_group,
const bool log_append,
const int log_versions,
const bool stdin_to_dev_null,
const bool combine_out_err)
{
if (!log_append && log_versions >= 1)
log_rotate(log_fn, log_versions);
RedirectStd redir(stdin_to_dev_null ? "/dev/null" : "",
log_fn,
log_append ? RedirectStd::FLAGS_APPEND : RedirectStd::FLAGS_OVERWRITE,
RedirectStd::MODE_USER_GROUP,
combine_out_err);
// if user_group specified, do chown on log file
try
{
if (user_group && redir.out.defined())
user_group->chown(redir.out(), log_fn);
}
catch (const std::exception &)
{
}
redir.redirect();
// possibly return a LogReopen object
if (!log_versions)
return LogSetup::Ptr(new LogReopen(log_fn, combine_out_err));
else
return LogSetup::Ptr();
}
inline void daemonize()
{
// ignore daemon() deprecated on macOS
#if defined(__APPLE__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
if (daemon(1, 1) < 0)
throw daemon_err("daemon() failed");
#if defined(__APPLE__)
#pragma clang diagnostic pop
#endif
}
inline LogSetup::Ptr daemonize(const std::string &log_fn,
const SetUserGroup *user_group,
const bool log_append,
const int log_versions)
{
LogSetup::Ptr ret = log_setup(log_fn, user_group, log_append, log_versions, true, true);
daemonize();
return ret;
}
inline void write_pid(const std::string &fn)
{
write_string(fn, to_string(::getpid()) + '\n');
}
class WritePid
{
public:
WritePid(const char *pid_fn_arg) // must remain in scope for lifetime of object
: pid_fn(pid_fn_arg)
{
if (pid_fn)
write_pid(pid_fn);
}
~WritePid()
{
if (pid_fn)
::unlink(pid_fn);
}
private:
WritePid(const WritePid &) = delete;
WritePid &operator=(const WritePid &) = delete;
const char *const pid_fn;
};
} // namespace openvpn
#endif
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