// 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) 2012-2020 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/>.
//
// Adapted from code Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// Parse an HTTP request
#ifndef OPENVPN_HTTP_REQUEST_H
#define OPENVPN_HTTP_REQUEST_H
#include <openvpn/http/header.hpp>
#include <openvpn/http/parseutil.hpp>
namespace openvpn {
namespace HTTP {
struct Request {
Request() : http_version_major(0), http_version_minor(0) {}
void reset()
{
method = "";
uri = "";
http_version_major = 0;
http_version_minor = 0;
headers.clear();
}
std::string to_string() const
{
std::ostringstream out;
out << "HTTP Request" << std::endl;
out << "method=" << method << std::endl;
out << "uri=" << uri << std::endl;
out << "version=" << http_version_major << '/' << http_version_minor << std::endl;
out << headers.to_string();
return out.str();
}
std::string to_string_compact() const
{
std::ostringstream out;
out << method << ' ' << uri << " HTTP/" << http_version_major << '.' << http_version_minor;
return out.str();
}
bool at_least_http_1_1() const
{
return http_version_major > 1 || (http_version_major == 1 && http_version_minor >= 1);
}
std::string method;
std::string uri;
int http_version_major;
int http_version_minor;
HeaderList headers;
};
class RequestParser {
enum state
{
method_start,
method,
uri,
http_version_h,
http_version_t_1,
http_version_t_2,
http_version_p,
http_version_slash,
http_version_major_start,
http_version_major,
http_version_minor_start,
http_version_minor,
expecting_newline_1,
header_line_start,
header_lws,
header_name,
space_before_header_value,
header_value,
expecting_newline_2,
expecting_newline_3
};
public:
enum status {
pending,
fail,
success,
};
RequestParser()
: state_(method_start)
{
}
// Reset to initial parser state.
void reset()
{
state_ = method_start;
}
// Parse some HTTP request data.
status consume(Request& req, const unsigned char input)
{
switch (state_)
{
case method_start:
if (!Util::is_char(input) || Util::is_ctl(input) || Util::is_tspecial(input))
{
return fail;
}
else
{
state_ = method;
req.method.push_back(input);
return pending;
}
case method:
if (input == ' ')
{
state_ = uri;
return pending;
}
else if (!Util::is_char(input) || Util::is_ctl(input) || Util::is_tspecial(input))
{
return fail;
}
else
{
req.method.push_back(input);
return pending;
}
case uri:
if (input == ' ')
{
state_ = http_version_h;
return pending;
}
else if (Util::is_ctl(input))
{
return fail;
}
else
{
req.uri.push_back(input);
return pending;
}
case http_version_h:
if (input == 'H')
{
state_ = http_version_t_1;
return pending;
}
else
{
return fail;
}
case http_version_t_1:
if (input == 'T')
{
state_ = http_version_t_2;
return pending;
}
else
{
return fail;
}
case http_version_t_2:
if (input == 'T')
{
state_ = http_version_p;
return pending;
}
else
{
return fail;
}
case http_version_p:
if (input == 'P')
{
state_ = http_version_slash;
return pending;
}
else
{
return fail;
}
case http_version_slash:
if (input == '/')
{
req.http_version_major = 0;
req.http_version_minor = 0;
state_ = http_version_major_start;
return pending;
}
else
{
return fail;
}
case http_version_major_start:
if (Util::is_digit(input))
{
req.http_version_major = req.http_version_major * 10 + input - '0';
state_ = http_version_major;
return pending;
}
else
{
return fail;
}
case http_version_major:
if (input == '.')
{
state_ = http_version_minor_start;
return pending;
}
else if (Util::is_digit(input))
{
req.http_version_major = req.http_version_major * 10 + input - '0';
return pending;
}
else
{
return fail;
}
case http_version_minor_start:
if (Util::is_digit(input))
{
req.http_version_minor = req.http_version_minor * 10 + input - '0';
state_ = http_version_minor;
return pending;
}
else
{
return fail;
}
case http_version_minor:
if (input == '\r')
{
state_ = expecting_newline_1;
return pending;
}
else if (Util::is_digit(input))
{
req.http_version_minor = req.http_version_minor * 10 + input - '0';
return pending;
}
else
{
return fail;
}
case expecting_newline_1:
if (input == '\n')
{
state_ = header_line_start;
return pending;
}
else
{
return fail;
}
case header_line_start:
if (input == '\r')
{
state_ = expecting_newline_3;
return pending;
}
else if (!req.headers.empty() && (input == ' ' || input == '\t'))
{
state_ = header_lws;
return pending;
}
else if (!Util::is_char(input) || Util::is_ctl(input) || Util::is_tspecial(input))
{
return fail;
}
else
{
req.headers.push_back(Header());
req.headers.back().name.push_back(input);
state_ = header_name;
return pending;
}
case header_lws:
if (input == '\r')
{
state_ = expecting_newline_2;
return pending;
}
else if (input == ' ' || input == '\t')
{
return pending;
}
else if (Util::is_ctl(input))
{
return fail;
}
else
{
state_ = header_value;
req.headers.back().value.push_back(input);
return pending;
}
case header_name:
if (input == ':')
{
state_ = space_before_header_value;
return pending;
}
else if (!Util::is_char(input) || Util::is_ctl(input) || Util::is_tspecial(input))
{
return fail;
}
else
{
req.headers.back().name.push_back(input);
return pending;
}
case space_before_header_value:
if (input == ' ')
{
state_ = header_value;
return pending;
}
else
{
return fail;
}
case header_value:
if (input == '\r')
{
state_ = expecting_newline_2;
return pending;
}
else if (Util::is_ctl(input))
{
return fail;
}
else
{
req.headers.back().value.push_back(input);
return pending;
}
case expecting_newline_2:
if (input == '\n')
{
state_ = header_line_start;
return pending;
}
else
{
return fail;
}
case expecting_newline_3:
if (input == '\n')
return success;
else
return fail;
default:
return fail;
}
}
private:
// The current state of the parser.
state state_;
};
struct RequestType
{
typedef Request State;
typedef RequestParser Parser;
};
}
}
#endif
