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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_PIPE_H
#define OPENVPN_COMMON_PIPE_H
#include <unistd.h>
#include <errno.h>
#include <string>
#include <openvpn/io/io.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/scoped_fd.hpp>
#include <openvpn/common/strerror.hpp>
#include <openvpn/buffer/buflist.hpp>
namespace openvpn {
namespace Pipe {
class SD
{
public:
SD(openvpn_io::io_context &io_context, ScopedFD &fd)
{
if (fd.defined())
sd.reset(new openvpn_io::posix::stream_descriptor(io_context, fd.release()));
}
bool defined() const
{
return bool(sd);
}
protected:
std::unique_ptr<openvpn_io::posix::stream_descriptor> sd;
};
class SD_OUT : public SD
{
public:
SD_OUT(openvpn_io::io_context &io_context, const std::string &content, ScopedFD &fd)
: SD(io_context, fd)
{
if (defined())
{
buf = buf_alloc_from_string(content);
queue_write();
}
}
private:
void queue_write()
{
sd->async_write_some(buf.const_buffer_limit(2048),
[this](const openvpn_io::error_code &ec, const size_t bytes_sent)
{
if (!ec && bytes_sent < buf.size())
{
buf.advance(bytes_sent);
queue_write();
}
else
{
sd->close();
}
});
}
BufferAllocated buf;
};
class SD_IN : public SD
{
public:
SD_IN(openvpn_io::io_context &io_context, ScopedFD &fd)
: SD(io_context, fd)
{
if (defined())
queue_read();
}
const std::string content() const
{
return data.to_string();
}
private:
void queue_read()
{
buf.reset(0, 2048, 0);
sd->async_read_some(buf.mutable_buffer_clamp(),
[this](const openvpn_io::error_code &ec, const size_t bytes_recvd)
{
if (!ec)
{
buf.set_size(bytes_recvd);
data.put_consume(buf);
queue_read();
}
else
{
sd->close();
}
});
}
BufferAllocated buf;
BufferList data;
};
inline void make_pipe(int fd[2])
{
if (::pipe(fd) < 0)
{
const int eno = errno;
OPENVPN_THROW_EXCEPTION("error creating pipe : " << strerror_str(eno));
}
}
inline void make_pipe(ScopedFD &read, ScopedFD &write)
{
int fd[2];
make_pipe(fd);
read.reset(fd[0]);
write.reset(fd[1]);
}
} // namespace Pipe
} // namespace openvpn
#endif
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