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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- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// Basic file-handling methods.
#ifndef OPENVPN_COMMON_FILE_H
#define OPENVPN_COMMON_FILE_H
#include <string>
#include <fstream>
#include <iostream>
#include <cstdint> // for std::uint64_t
#include <openvpn/common/exception.hpp>
#include <openvpn/common/unicode.hpp>
#include <openvpn/buffer/buffer.hpp>
#include <openvpn/buffer/bufstr.hpp>
#include <openvpn/buffer/buflist.hpp>
#if defined(OPENVPN_PLATFORM_WIN)
#include <filesystem>
#include <openvpn/win/unicode.hpp>
#endif
namespace openvpn {
OPENVPN_UNTAGGED_EXCEPTION(file_exception);
OPENVPN_UNTAGGED_EXCEPTION_INHERIT(file_exception, open_file_error);
OPENVPN_UNTAGGED_EXCEPTION_INHERIT(file_exception, file_too_large);
OPENVPN_UNTAGGED_EXCEPTION_INHERIT(file_exception, file_is_binary);
OPENVPN_UNTAGGED_EXCEPTION_INHERIT(file_exception, file_not_utf8);
// Read text from file via stream approach that doesn't require that we
// establish the length of the file in advance.
inline std::string read_text_simple(const std::string &filename)
{
std::ifstream ifs(filename.c_str());
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot open for read: " << filename);
const std::string str((std::istreambuf_iterator<char>(ifs)), std::istreambuf_iterator<char>());
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot read: " << filename);
return str;
}
// Read a file (may be text or binary).
inline BufferPtr read_binary(const std::string &filename,
const std::uint64_t max_size = 0,
const unsigned int buffer_flags = 0)
{
#if defined(OPENVPN_PLATFORM_WIN)
Win::UTF16 filenamew(Win::utf16(filename));
std::filesystem::path path(filenamew.get());
std::ifstream ifs(path, std::ios::binary);
#else
std::ifstream ifs(filename.c_str(), std::ios::binary);
#endif // OPENVPN_PLATFORM_WIN
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot open for read: " << filename);
// get length of file
ifs.seekg(0, std::ios::end);
const std::streamsize length = ifs.tellg();
if (max_size && std::uint64_t(length) > max_size)
OPENVPN_THROW(file_too_large, "file too large [" << length << '/' << max_size << "]: " << filename);
ifs.seekg(0, std::ios::beg);
// allocate buffer
auto b = BufferAllocatedRc::Create(size_t(length), buffer_flags | BufAllocFlags::ARRAY);
// read data
ifs.read((char *)b->data(), length);
// check for errors
if (ifs.gcount() != length)
OPENVPN_THROW(open_file_error, "read length inconsistency: " << filename);
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot read: " << filename);
return b;
}
// Read a file (may be text or binary) without seeking to determine
// its length.
inline BufferPtr read_binary_linear(const std::string &filename,
const std::uint64_t max_size = 0,
const size_t block_size = 1024)
{
std::ifstream ifs(filename.c_str(), std::ios::binary);
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot open for read: " << filename);
BufferList buflist;
std::streamsize total_size = 0;
while (true)
{
auto b = BufferAllocatedRc::Create(block_size, 0);
ifs.read((char *)b->data(), b->remaining());
const std::streamsize size = ifs.gcount();
if (size)
{
b->set_size(static_cast<size_t>(size));
total_size += size;
if (max_size && std::uint64_t(total_size) > max_size)
OPENVPN_THROW(file_too_large, "file too large [" << total_size << '/' << max_size << "]: " << filename);
buflist.push_back(std::move(b));
}
if (ifs.eof())
break;
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot read: " << filename);
}
return buflist.join();
}
// Read a text file as a std::string, throw error if file is binary
inline std::string read_text(const std::string &filename, const std::uint64_t max_size = 0)
{
BufferPtr bp = read_binary(filename, max_size);
if (bp->contains_null())
OPENVPN_THROW(file_is_binary, "file is binary: " << filename);
return std::string((const char *)bp->c_data(), bp->size());
}
// Read a UTF-8 file as a std::string, throw errors if file is binary or malformed UTF-8
inline std::string read_text_utf8(const std::string &filename, const std::uint64_t max_size = 0)
{
BufferPtr bp = read_binary(filename, max_size);
// check if binary
if (bp->contains_null())
OPENVPN_THROW(file_is_binary, "file is binary: " << filename);
// remove Windows UTF-8 BOM if present
if (bp->size() >= 3)
{
const unsigned char *data = bp->c_data();
if (data[0] == 0xEF && data[1] == 0xBB && data[2] == 0xBF)
bp->advance(3);
}
// verify that file is valid UTF-8
if (!Unicode::is_valid_utf8_uchar_buf(bp->c_data(), bp->size()))
OPENVPN_THROW(file_not_utf8, "file is not UTF8: " << filename);
return std::string((const char *)bp->c_data(), bp->size());
}
// Read multi-line string from stdin
inline std::string read_stdin()
{
std::string ret;
std::string line;
while (std::getline(std::cin, line))
{
ret += line;
ret += '\n';
}
return ret;
}
// Write binary buffer to file
inline void write_binary(const std::string &filename, const Buffer &buf)
{
std::ofstream ofs(filename.c_str(), std::ios::binary);
if (!ofs)
OPENVPN_THROW(open_file_error, "cannot open for write: " << filename);
ofs.write((const char *)buf.c_data(), buf.size());
if (!ofs)
OPENVPN_THROW(open_file_error, "cannot write: " << filename);
}
// Write binary buffer list to file
template <typename BUFLIST>
inline void write_binary_list(const std::string &filename, const BUFLIST &buflist)
{
std::ofstream ofs(filename.c_str(), std::ios::binary);
if (!ofs)
OPENVPN_THROW(open_file_error, "cannot open for write: " << filename);
for (auto &buf : buflist)
{
ofs.write((const char *)buf->c_data(), buf->size());
if (!ofs)
OPENVPN_THROW(open_file_error, "cannot write: " << filename);
}
}
// Write std::string to file
inline void write_string(const std::string &filename, const std::string &str)
{
BufferPtr buf = buf_from_string(str);
write_binary(filename, *buf);
}
} // namespace openvpn
#endif // OPENVPN_COMMON_FILE_H
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