Handshake.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_OVERLAY_HANDSHAKE_H_INCLUDED
#define RIPPLE_OVERLAY_HANDSHAKE_H_INCLUDED
 
#include <xrpld/app/main/Application.h>
#include <xrpld/overlay/detail/ProtocolVersion.h>
#include <xrpl/beast/utility/Journal.h>
#include <xrpl/protocol/BuildInfo.h>
 
#include <boost/asio/ssl.hpp>
#include <boost/beast/core/tcp_stream.hpp>
#include <boost/beast/http/dynamic_body.hpp>
#include <boost/beast/http/empty_body.hpp>
#include <boost/beast/http/fields.hpp>
#include <boost/beast/ssl/ssl_stream.hpp>
 
#include <optional>
#include <utility>
 
namespace ripple {
 
using socket_type = boost::beast::tcp_stream;
using stream_type = boost::beast::ssl_stream<socket_type>;
using request_type =
    boost::beast::http::request<boost::beast::http::empty_body>;
using http_request_type =
    boost::beast::http::request<boost::beast::http::dynamic_body>;
using http_response_type =
    boost::beast::http::response<boost::beast::http::dynamic_body>;
 
std::optional<uint256>
makeSharedValue(stream_type& ssl, beast::Journal journal);
 
void
buildHandshake(
    boost::beast::http::fields& h,
    uint256 const& sharedValue,
    std::optional<std::uint32_t> networkID,
    beast::IP::Address public_ip,
    beast::IP::Address remote_ip,
    Application& app);
 
PublicKey
verifyHandshake(
    boost::beast::http::fields const& headers,
    uint256 const& sharedValue,
    std::optional<std::uint32_t> networkID,
    beast::IP::Address public_ip,
    beast::IP::Address remote,
    Application& app);
 
request_type
makeRequest(
    bool crawlPublic,
    bool comprEnabled,
    bool ledgerReplayEnabled,
    bool txReduceRelayEnabled,
    bool vpReduceRelayEnabled);
 
http_response_type
makeResponse(
    bool crawlPublic,
    http_request_type const& req,
    beast::IP::Address public_ip,
    beast::IP::Address remote_ip,
    uint256 const& sharedValue,
    std::optional<std::uint32_t> networkID,
    ProtocolVersion version,
    Application& app);
 
// Protocol features negotiated via HTTP handshake.
// The format is:
// X-Protocol-Ctl: feature1=value1[,value2]*[\s*;\s*feature2=value1[,value2]*]*
// value: \S+
 
// compression feature
static constexpr char FEATURE_COMPR[] = "compr";
// validation/proposal reduce-relay feature
static constexpr char FEATURE_VPRR[] = "vprr";
// transaction reduce-relay feature
static constexpr char FEATURE_TXRR[] = "txrr";
// ledger replay
static constexpr char FEATURE_LEDGER_REPLAY[] = "ledgerreplay";
static constexpr char DELIM_FEATURE[] = ";";
static constexpr char DELIM_VALUE[] = ",";
 
std::optional<std::string>
getFeatureValue(
    boost::beast::http::fields const& headers,
    std::string const& feature);
 
bool
isFeatureValue(
    boost::beast::http::fields const& headers,
    std::string const& feature,
    std::string const& value);
 
bool
featureEnabled(
    boost::beast::http::fields const& headers,
    std::string const& feature);
 
template <typename headers>
bool
peerFeatureEnabled(
    headers const& request,
    std::string const& feature,
    std::string value,
    bool config)
{
    return config && isFeatureValue(request, feature, value);
}
 
template <typename headers>
bool
peerFeatureEnabled(
    headers const& request,
    std::string const& feature,
    bool config)
{
    return config && peerFeatureEnabled(request, feature, "1", config);
}
 
std::string
makeFeaturesRequestHeader(
    bool comprEnabled,
    bool ledgerReplayEnabled,
    bool txReduceRelayEnabled,
    bool vpReduceRelayEnabled);
 
std::string
makeFeaturesResponseHeader(
    http_request_type const& headers,
    bool comprEnabled,
    bool ledgerReplayEnabled,
    bool txReduceRelayEnabled,
    bool vpReduceRelayEnabled);
 
}  // namespace ripple
 
#endif