mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
1e855667a1
std::strerror() doesn't claim to be thread-safe, so add openvpn::strerror_str() which is thread-safe by virtue of the fact that it backs to strerror_r(). Signed-off-by: James Yonan <james@openvpn.net>
107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
// 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) 2012-2017 OpenVPN Technologies, Inc.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU 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 General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program in the COPYING file.
|
|
// If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#ifndef OPENVPN_COMMON_PERSISTFILE_H
|
|
#define OPENVPN_COMMON_PERSISTFILE_H
|
|
|
|
#include <sys/types.h> // for open(), lseek(), ftruncate()
|
|
#include <sys/stat.h> // for open()
|
|
#include <fcntl.h> // for open()
|
|
#include <unistd.h> // for write(), lseek(), ftruncate()
|
|
#include <errno.h>
|
|
|
|
#include <string>
|
|
|
|
#include <openvpn/common/size.hpp>
|
|
#include <openvpn/common/exception.hpp>
|
|
#include <openvpn/common/scoped_fd.hpp>
|
|
#include <openvpn/common/write.hpp>
|
|
#include <openvpn/common/strerror.hpp>
|
|
#include <openvpn/buffer/buffer.hpp>
|
|
|
|
namespace openvpn {
|
|
class PersistentFile
|
|
{
|
|
public:
|
|
PersistentFile(const std::string& fn_arg)
|
|
: fn(fn_arg)
|
|
{
|
|
const int f = ::open(fn.c_str(), O_WRONLY|O_CREAT|O_CLOEXEC, S_IRUSR|S_IWUSR);
|
|
if (f < 0)
|
|
syserr("open");
|
|
fd.reset(f);
|
|
}
|
|
|
|
void write(const void *buf, size_t count)
|
|
{
|
|
const off_t off = ::lseek(fd(), 0, SEEK_SET);
|
|
if (off < 0)
|
|
syserr("seek");
|
|
if (off)
|
|
err("unexpected seek");
|
|
if (::ftruncate(fd(), 0) < 0)
|
|
syserr("truncate");
|
|
const ssize_t len = write_retry(fd(), buf, count);
|
|
if (len < 0)
|
|
syserr("write");
|
|
if (len != count || len != ::lseek(fd(), 0, SEEK_CUR))
|
|
err("incomplete write");
|
|
if (::ftruncate(fd(), len) < 0)
|
|
syserr("truncate");
|
|
}
|
|
|
|
struct stat stat()
|
|
{
|
|
struct stat s;
|
|
if (::fstat(fd(), &s) < 0)
|
|
syserr("fstat");
|
|
return s;
|
|
}
|
|
|
|
void write(const Buffer& buf)
|
|
{
|
|
write(buf.c_data(), buf.size());
|
|
}
|
|
|
|
void write(const std::string& str)
|
|
{
|
|
write(str.c_str(), str.length());
|
|
}
|
|
|
|
private:
|
|
void syserr(const char *type)
|
|
{
|
|
const int eno = errno;
|
|
OPENVPN_THROW_EXCEPTION(fn << " : " << type << " error : " << strerror_str(eno));
|
|
}
|
|
|
|
void err(const char *type)
|
|
{
|
|
OPENVPN_THROW_EXCEPTION(fn << " : " << type << " error");
|
|
}
|
|
|
|
std::string fn;
|
|
ScopedFD fd;
|
|
};
|
|
}
|
|
|
|
#endif
|