mirror of
https://github.com/OpenVPN/openvpn3.git
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88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
//
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// writeprivate.hpp
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// OpenVPN
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//
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// Copyright (C) 2012-2016 OpenVPN Technologies, Inc.
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// All rights reserved.
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//
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#ifndef OPENVPN_COMMON_WRITEPRIVATE_H
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#define OPENVPN_COMMON_WRITEPRIVATE_H
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#include <string>
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#include <openvpn/common/platform.hpp>
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#if !defined(OPENVPN_PLATFORM_WIN)
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#include <cstring> // for std::strerror()
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#include <sys/types.h> // for open(), ftruncate()
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#include <sys/stat.h> // for open()
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#include <fcntl.h> // for open()
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#include <unistd.h> // for write(), ftruncate()
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#include <errno.h>
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#endif
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/size.hpp>
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#include <openvpn/buffer/buffer.hpp>
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#if !defined(OPENVPN_PLATFORM_WIN)
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#include <openvpn/common/scoped_fd.hpp>
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#include <openvpn/common/write.hpp>
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#endif
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namespace openvpn {
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#if defined(OPENVPN_PLATFORM_WIN)
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inline void write_private(const std::string& path, const void *buf, size_t count)
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{
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OPENVPN_THROW_EXCEPTION("write_private('" << path << "') : not implemented on Windows yet");
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}
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#else
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inline void write_private(const std::string& path, const void *buf, size_t count)
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{
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ScopedFD fd(::open(path.c_str(), O_WRONLY|O_CREAT|O_CLOEXEC, S_IRUSR|S_IWUSR));
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if (!fd.defined())
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{
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const int eno = errno;
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OPENVPN_THROW_EXCEPTION(path << " : open error : " << std::strerror(eno));
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}
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if (::ftruncate(fd(), 0) < 0)
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{
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const int eno = errno;
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OPENVPN_THROW_EXCEPTION(path << " : truncate error : " << std::strerror(eno));
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}
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const ssize_t len = write_retry(fd(), buf, count);
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if (len == -1)
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{
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const int eno = errno;
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OPENVPN_THROW_EXCEPTION(path << " : write error : " << std::strerror(eno));
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}
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else if (len != count)
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OPENVPN_THROW_EXCEPTION(path << " : unexpected write size");
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if (!fd.close())
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{
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const int eno = errno;
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OPENVPN_THROW_EXCEPTION(path << " : close error : " << std::strerror(eno));
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}
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}
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#endif
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inline void write_private(const std::string& path, const Buffer& buf)
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{
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write_private(path, buf.c_data(), buf.size());
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}
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inline void write_private(const std::string& path, const std::string& str)
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{
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write_private(path, str.c_str(), str.length());
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}
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}
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#endif
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