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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_HOSTPORT_H
#define OPENVPN_COMMON_HOSTPORT_H
#include <string>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/number.hpp>
#include <openvpn/common/options.hpp>
#include <openvpn/common/unicode.hpp>
namespace openvpn {
namespace HostPort {
OPENVPN_EXCEPTION(host_port_error);
inline bool is_valid_port(const unsigned int port)
{
return port < 65536;
}
inline bool is_valid_port(const std::string &port, unsigned int *value = nullptr)
{
return parse_number_validate<unsigned int>(port, 5, 1, 65535, value);
}
inline void validate_port(const std::string &port, const std::string &title, unsigned int *value = nullptr)
{
if (!is_valid_port(port, value))
OPENVPN_THROW(host_port_error, "bad " << title << " port number: " << Unicode::utf8_printable(port, 16));
}
inline void validate_port(const unsigned int port, const std::string &title)
{
if (!is_valid_port(port))
OPENVPN_THROW(host_port_error, "bad " << title << " port number: " << port);
}
inline unsigned short parse_port(const std::string &port, const std::string &title)
{
unsigned int ret = 0;
validate_port(port, title, &ret);
return static_cast<unsigned short>(ret);
}
// An IP address is also considered to be a valid host
inline bool is_valid_host_char(const char c)
{
return (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| (c >= '0' && c <= '9')
|| c == '.'
|| c == '-'
|| c == ':'; // for IPv6
}
inline bool is_valid_host(const std::string &host)
{
if (!host.length() || host.length() > 256)
return false;
for (const auto &c : host)
{
if (!is_valid_host_char(c))
return false;
}
return true;
}
inline bool is_valid_unix_sock_char(const unsigned char c)
{
return c >= 0x21 && c <= 0x7E;
}
inline bool is_valid_unix_sock(const std::string &host)
{
if (!host.length() || host.length() > 256)
return false;
for (const auto &c : host)
{
if (!is_valid_unix_sock_char(c))
return false;
}
return true;
}
inline void validate_host(const std::string &host, const std::string &title)
{
if (!is_valid_host(host))
OPENVPN_THROW(host_port_error, "bad " << title << " host: " << Unicode::utf8_printable(host, 64));
}
inline bool split_host_port(const std::string &str,
std::string &host,
std::string &port,
const std::string &default_port,
const bool allow_unix,
unsigned int *port_save = nullptr)
{
if (port_save)
*port_save = 0;
const size_t fpos = str.find_first_of(':');
const size_t lpos = str.find_last_of(':');
const size_t cb = str.find_last_of(']');
if (lpos != std::string::npos // has one or more colons (':')
&& (cb == std::string::npos || cb + 1 == lpos) // either has no closing bracket (']') or closing bracket followed by a colon ("]:")
&& (cb != std::string::npos || fpos == lpos)) // either has a closing bracket (']') or a single colon (':') to avoid fake-out by IPv6 addresses without a port
{
// host:port or [host]:port specified
host = str.substr(0, lpos);
port = str.substr(lpos + 1);
}
else if (!default_port.empty())
{
// only host specified
host = str;
port = default_port;
}
else
return false;
// unbracket host
if (host.length() >= 2 && host[0] == '[' && host[host.length() - 1] == ']')
host = host.substr(1, host.length() - 2);
if (allow_unix && port == "unix")
return is_valid_unix_sock(host);
else
return is_valid_host(host) && is_valid_port(port, port_save);
}
} // namespace HostPort
} // namespace openvpn
#endif
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