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monero/src/p2p/net_node.h

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// Copyright (c) 2014-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#pragma once
#include <array>
#include <atomic>
#include <boost/asio/io_service.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/thread.hpp>
#include <boost/optional/optional_fwd.hpp>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/variables_map.hpp>
#include <boost/uuid/uuid.hpp>
#include <chrono>
#include <functional>
#include <utility>
#include <vector>
#include "cryptonote_config.h"
#include "cryptonote_protocol/fwd.h"
#include "cryptonote_protocol/levin_notify.h"
#include "warnings.h"
#include "net/abstract_tcp_server2.h"
#include "net/levin_protocol_handler.h"
#include "net/levin_protocol_handler_async.h"
#include "p2p_protocol_defs.h"
#include "storages/levin_abstract_invoke2.h"
#include "net_peerlist.h"
#include "math_helper.h"
#include "net_node_common.h"
#include "net/enums.h"
#include "net/fwd.h"
#include "common/command_line.h"
PUSH_WARNINGS
DISABLE_VS_WARNINGS(4355)
namespace nodetool
{
struct proxy
{
proxy()
: max_connections(-1),
address(),
zone(epee::net_utils::zone::invalid),
noise(true)
{}
std::int64_t max_connections;
boost::asio::ip::tcp::endpoint address;
epee::net_utils::zone zone;
bool noise;
};
struct anonymous_inbound
{
anonymous_inbound()
: max_connections(-1),
local_ip(),
local_port(),
our_address(),
default_remote()
{}
std::int64_t max_connections;
std::string local_ip;
std::string local_port;
epee::net_utils::network_address our_address;
epee::net_utils::network_address default_remote;
};
boost::optional<std::vector<proxy>> get_proxies(const boost::program_options::variables_map& vm);
boost::optional<std::vector<anonymous_inbound>> get_anonymous_inbounds(const boost::program_options::variables_map& vm);
//! \return True if `commnd` is filtered (ignored/dropped) for `address`
bool is_filtered_command(epee::net_utils::network_address const& address, int command);
// hides boost::future and chrono stuff from mondo template file
boost::optional<boost::asio::ip::tcp::socket>
socks_connect_internal(const std::atomic<bool>& stop_signal, boost::asio::io_service& service, const boost::asio::ip::tcp::endpoint& proxy, const epee::net_utils::network_address& remote);
template<class base_type>
struct p2p_connection_context_t: base_type //t_payload_net_handler::connection_context //public net_utils::connection_context_base
{
p2p_connection_context_t()
: fluff_txs(),
flush_time(std::chrono::steady_clock::time_point::max()),
peer_id(0),
support_flags(0),
m_in_timedsync(false)
{}
std::vector<cryptonote::blobdata> fluff_txs;
std::chrono::steady_clock::time_point flush_time;
peerid_type peer_id;
uint32_t support_flags;
bool m_in_timedsync;
std::set<epee::net_utils::network_address> sent_addresses;
};
template<class t_payload_net_handler>
class node_server: public epee::levin::levin_commands_handler<p2p_connection_context_t<typename t_payload_net_handler::connection_context> >,
public i_p2p_endpoint<typename t_payload_net_handler::connection_context>,
public epee::net_utils::i_connection_filter
{
struct by_conn_id{};
struct by_peer_id{};
struct by_addr{};
typedef p2p_connection_context_t<typename t_payload_net_handler::connection_context> p2p_connection_context;
typedef COMMAND_HANDSHAKE_T<typename t_payload_net_handler::payload_type> COMMAND_HANDSHAKE;
typedef COMMAND_TIMED_SYNC_T<typename t_payload_net_handler::payload_type> COMMAND_TIMED_SYNC;
typedef epee::net_utils::boosted_tcp_server<epee::levin::async_protocol_handler<p2p_connection_context>> net_server;
struct network_zone;
using connect_func = boost::optional<p2p_connection_context>(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
struct config_t
{
config_t()
: m_net_config(),
m_peer_id(crypto::rand<uint64_t>()),
m_support_flags(0)
{}
network_config m_net_config;
uint64_t m_peer_id;
uint32_t m_support_flags;
};
typedef epee::misc_utils::struct_init<config_t> config;
struct network_zone
{
network_zone()
: m_connect(nullptr),
m_net_server(epee::net_utils::e_connection_type_P2P),
m_bind_ip(),
m_bind_ipv6_address(),
m_port(),
m_port_ipv6(),
m_notifier(),
m_our_address(),
m_peerlist(),
m_config{},
m_proxy_address(),
m_current_number_of_out_peers(0),
m_current_number_of_in_peers(0),
m_can_pingback(false)
{
set_config_defaults();
}
network_zone(boost::asio::io_service& public_service)
: m_connect(nullptr),
m_net_server(public_service, epee::net_utils::e_connection_type_P2P),
m_bind_ip(),
m_bind_ipv6_address(),
m_port(),
m_port_ipv6(),
m_notifier(),
m_our_address(),
m_peerlist(),
m_config{},
m_proxy_address(),
m_current_number_of_out_peers(0),
m_current_number_of_in_peers(0),
m_can_pingback(false)
{
set_config_defaults();
}
connect_func* m_connect;
net_server m_net_server;
std::string m_bind_ip;
std::string m_bind_ipv6_address;
std::string m_port;
std::string m_port_ipv6;
cryptonote::levin::notify m_notifier;
epee::net_utils::network_address m_our_address; // in anonymity networks
peerlist_manager m_peerlist;
config m_config;
boost::asio::ip::tcp::endpoint m_proxy_address;
std::atomic<unsigned int> m_current_number_of_out_peers;
std::atomic<unsigned int> m_current_number_of_in_peers;
bool m_can_pingback;
private:
void set_config_defaults() noexcept
{
// at this moment we have a hardcoded config
m_config.m_net_config.handshake_interval = P2P_DEFAULT_HANDSHAKE_INTERVAL;
m_config.m_net_config.packet_max_size = P2P_DEFAULT_PACKET_MAX_SIZE;
m_config.m_net_config.config_id = 0;
m_config.m_net_config.connection_timeout = P2P_DEFAULT_CONNECTION_TIMEOUT;
m_config.m_net_config.ping_connection_timeout = P2P_DEFAULT_PING_CONNECTION_TIMEOUT;
m_config.m_net_config.send_peerlist_sz = P2P_DEFAULT_PEERS_IN_HANDSHAKE;
m_config.m_support_flags = 0; // only set in public zone
}
};
enum igd_t
{
no_igd,
igd,
delayed_igd,
};
public:
typedef t_payload_net_handler payload_net_handler;
node_server(t_payload_net_handler& payload_handler)
: m_payload_handler(payload_handler),
m_external_port(0),
m_rpc_port(0),
m_rpc_credits_per_hash(0),
m_allow_local_ip(false),
m_hide_my_port(false),
m_igd(no_igd),
m_offline(false),
is_closing(false),
m_network_id()
{}
virtual ~node_server();
static void init_options(boost::program_options::options_description& desc);
bool run();
network_zone& add_zone(epee::net_utils::zone zone);
bool init(const boost::program_options::variables_map& vm);
bool deinit();
bool send_stop_signal();
uint32_t get_this_peer_port(){return m_listening_port;}
t_payload_net_handler& get_payload_object();
// debug functions
bool log_peerlist();
bool log_connections();
// These functions only return information for the "public" zone
virtual uint64_t get_public_connections_count();
size_t get_public_outgoing_connections_count();
size_t get_public_white_peers_count();
size_t get_public_gray_peers_count();
void get_public_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white);
void get_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white);
void change_max_out_public_peers(size_t count);
uint32_t get_max_out_public_peers() const;
void change_max_in_public_peers(size_t count);
uint32_t get_max_in_public_peers() const;
virtual bool block_host(const epee::net_utils::network_address &adress, time_t seconds = P2P_IP_BLOCKTIME);
virtual bool unblock_host(const epee::net_utils::network_address &address);
virtual bool block_subnet(const epee::net_utils::ipv4_network_subnet &subnet, time_t seconds = P2P_IP_BLOCKTIME);
virtual bool unblock_subnet(const epee::net_utils::ipv4_network_subnet &subnet);
virtual bool is_host_blocked(const epee::net_utils::network_address &address, time_t *seconds) { CRITICAL_REGION_LOCAL(m_blocked_hosts_lock); return !is_remote_host_allowed(address, seconds); }
virtual std::map<std::string, time_t> get_blocked_hosts() { CRITICAL_REGION_LOCAL(m_blocked_hosts_lock); return m_blocked_hosts; }
virtual std::map<epee::net_utils::ipv4_network_subnet, time_t> get_blocked_subnets() { CRITICAL_REGION_LOCAL(m_blocked_hosts_lock); return m_blocked_subnets; }
virtual void add_used_stripe_peer(const typename t_payload_net_handler::connection_context &context);
virtual void remove_used_stripe_peer(const typename t_payload_net_handler::connection_context &context);
virtual void clear_used_stripe_peers();
private:
const std::vector<std::string> m_seed_nodes_list =
{ "seeds.moneroseeds.se"
, "seeds.moneroseeds.ae.org"
, "seeds.moneroseeds.ch"
, "seeds.moneroseeds.li"
};
bool islimitup=false;
bool islimitdown=false;
CHAIN_LEVIN_INVOKE_MAP2(p2p_connection_context); //move levin_commands_handler interface invoke(...) callbacks into invoke map
CHAIN_LEVIN_NOTIFY_MAP2(p2p_connection_context); //move levin_commands_handler interface notify(...) callbacks into nothing
BEGIN_INVOKE_MAP2(node_server)
if (is_filtered_command(context.m_remote_address, command))
return LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED;
HANDLE_INVOKE_T2(COMMAND_HANDSHAKE, &node_server::handle_handshake)
HANDLE_INVOKE_T2(COMMAND_TIMED_SYNC, &node_server::handle_timed_sync)
HANDLE_INVOKE_T2(COMMAND_PING, &node_server::handle_ping)
HANDLE_INVOKE_T2(COMMAND_REQUEST_SUPPORT_FLAGS, &node_server::handle_get_support_flags)
CHAIN_INVOKE_MAP_TO_OBJ_FORCE_CONTEXT(m_payload_handler, typename t_payload_net_handler::connection_context&)
END_INVOKE_MAP2()
enum PeerType { anchor = 0, white, gray };
//----------------- commands handlers ----------------------------------------------
int handle_handshake(int command, typename COMMAND_HANDSHAKE::request& arg, typename COMMAND_HANDSHAKE::response& rsp, p2p_connection_context& context);
int handle_timed_sync(int command, typename COMMAND_TIMED_SYNC::request& arg, typename COMMAND_TIMED_SYNC::response& rsp, p2p_connection_context& context);
int handle_ping(int command, COMMAND_PING::request& arg, COMMAND_PING::response& rsp, p2p_connection_context& context);
int handle_get_support_flags(int command, COMMAND_REQUEST_SUPPORT_FLAGS::request& arg, COMMAND_REQUEST_SUPPORT_FLAGS::response& rsp, p2p_connection_context& context);
bool init_config();
bool make_default_peer_id();
bool make_default_config();
bool store_config();
//----------------- levin_commands_handler -------------------------------------------------------------
virtual void on_connection_new(p2p_connection_context& context);
virtual void on_connection_close(p2p_connection_context& context);
virtual void callback(p2p_connection_context& context);
//----------------- i_p2p_endpoint -------------------------------------------------------------
virtual bool relay_notify_to_list(int command, const epee::span<const uint8_t> data_buff, std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections);
virtual epee::net_utils::zone send_txs(std::vector<cryptonote::blobdata> txs, const epee::net_utils::zone origin, const boost::uuids::uuid& source, cryptonote::relay_method tx_relay);
virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context);
virtual bool invoke_notify_to_peer(int command, const epee::span<const uint8_t> req_buff, const epee::net_utils::connection_context_base& context);
virtual bool drop_connection(const epee::net_utils::connection_context_base& context);
virtual void request_callback(const epee::net_utils::connection_context_base& context);
virtual void for_each_connection(std::function<bool(typename t_payload_net_handler::connection_context&, peerid_type, uint32_t)> f);
virtual bool for_connection(const boost::uuids::uuid&, std::function<bool(typename t_payload_net_handler::connection_context&, peerid_type, uint32_t)> f);
virtual bool add_host_fail(const epee::net_utils::network_address &address, unsigned int score = 1);
//----------------- i_connection_filter --------------------------------------------------------
virtual bool is_remote_host_allowed(const epee::net_utils::network_address &address, time_t *t = NULL);
//-----------------------------------------------------------------------------------------------
bool parse_peer_from_string(epee::net_utils::network_address& pe, const std::string& node_addr, uint16_t default_port = 0);
bool handle_command_line(
const boost::program_options::variables_map& vm
);
bool idle_worker();
bool handle_remote_peerlist(const std::vector<peerlist_entry>& peerlist, const epee::net_utils::connection_context_base& context);
bool get_local_node_data(basic_node_data& node_data, const network_zone& zone);
//bool get_local_handshake_data(handshake_data& hshd);
bool sanitize_peerlist(std::vector<peerlist_entry>& local_peerlist);
bool connections_maker();
bool peer_sync_idle_maker();
bool do_handshake_with_peer(peerid_type& pi, p2p_connection_context& context, bool just_take_peerlist = false);
bool do_peer_timed_sync(const epee::net_utils::connection_context_base& context, peerid_type peer_id);
bool make_new_connection_from_anchor_peerlist(const std::vector<anchor_peerlist_entry>& anchor_peerlist);
bool make_new_connection_from_peerlist(network_zone& zone, bool use_white_list);
bool try_to_connect_and_handshake_with_new_peer(const epee::net_utils::network_address& na, bool just_take_peerlist = false, uint64_t last_seen_stamp = 0, PeerType peer_type = white, uint64_t first_seen_stamp = 0);
size_t get_random_index_with_fixed_probability(size_t max_index);
bool is_peer_used(const peerlist_entry& peer);
bool is_peer_used(const anchor_peerlist_entry& peer);
bool is_addr_connected(const epee::net_utils::network_address& peer);
void add_upnp_port_mapping_impl(uint32_t port, bool ipv6=false);
void add_upnp_port_mapping_v4(uint32_t port);
void add_upnp_port_mapping_v6(uint32_t port);
void add_upnp_port_mapping(uint32_t port, bool ipv4=true, bool ipv6=false);
void delete_upnp_port_mapping_impl(uint32_t port, bool ipv6=false);
void delete_upnp_port_mapping_v4(uint32_t port);
void delete_upnp_port_mapping_v6(uint32_t port);
void delete_upnp_port_mapping(uint32_t port);
template<class t_callback>
bool try_ping(basic_node_data& node_data, p2p_connection_context& context, const t_callback &cb);
bool try_get_support_flags(const p2p_connection_context& context, std::function<void(p2p_connection_context&, const uint32_t&)> f);
bool make_expected_connections_count(network_zone& zone, PeerType peer_type, size_t expected_connections);
void record_addr_failed(const epee::net_utils::network_address& addr);
bool is_addr_recently_failed(const epee::net_utils::network_address& addr);
bool is_priority_node(const epee::net_utils::network_address& na);
std::set<std::string> get_seed_nodes(cryptonote::network_type nettype) const;
std::set<std::string> get_seed_nodes();
bool connect_to_seed();
template <class Container>
bool connect_to_peerlist(const Container& peers);
template <class Container>
bool parse_peers_and_add_to_container(const boost::program_options::variables_map& vm, const command_line::arg_descriptor<std::vector<std::string> > & arg, Container& container);
bool set_max_out_peers(network_zone& zone, int64_t max);
bool set_max_in_peers(network_zone& zone, int64_t max);
bool set_tos_flag(const boost::program_options::variables_map& vm, int limit);
bool set_rate_up_limit(const boost::program_options::variables_map& vm, int64_t limit);
bool set_rate_down_limit(const boost::program_options::variables_map& vm, int64_t limit);
bool set_rate_limit(const boost::program_options::variables_map& vm, int64_t limit);
bool has_too_many_connections(const epee::net_utils::network_address &address);
size_t get_incoming_connections_count();
size_t get_incoming_connections_count(network_zone&);
size_t get_outgoing_connections_count();
size_t get_outgoing_connections_count(network_zone&);
bool check_connection_and_handshake_with_peer(const epee::net_utils::network_address& na, uint64_t last_seen_stamp);
bool gray_peerlist_housekeeping();
bool check_incoming_connections();
void kill() { ///< will be called e.g. from deinit()
_info("Killing the net_node");
is_closing = true;
if(mPeersLoggerThread != nullptr)
mPeersLoggerThread->join(); // make sure the thread finishes
_info("Joined extra background net_node threads");
}
//debug functions
std::string print_connections_container();
public:
void set_rpc_port(uint16_t rpc_port)
{
m_rpc_port = rpc_port;
}
void set_rpc_credits_per_hash(uint32_t rpc_credits_per_hash)
{
m_rpc_credits_per_hash = rpc_credits_per_hash;
}
private:
std::string m_config_folder;
bool m_have_address;
bool m_first_connection_maker_call;
uint32_t m_listening_port;
uint32_t m_listening_port_ipv6;
uint32_t m_external_port;
uint16_t m_rpc_port;
uint32_t m_rpc_credits_per_hash;
bool m_allow_local_ip;
bool m_hide_my_port;
igd_t m_igd;
bool m_offline;
bool m_use_ipv6;
bool m_require_ipv4;
std::atomic<bool> is_closing;
std::unique_ptr<boost::thread> mPeersLoggerThread;
//critical_section m_connections_lock;
//connections_indexed_container m_connections;
t_payload_net_handler& m_payload_handler;
peerlist_storage m_peerlist_storage;
epee::math_helper::once_a_time_seconds<P2P_DEFAULT_HANDSHAKE_INTERVAL> m_peer_handshake_idle_maker_interval;
epee::math_helper::once_a_time_seconds<1> m_connections_maker_interval;
epee::math_helper::once_a_time_seconds<60*30, false> m_peerlist_store_interval;
epee::math_helper::once_a_time_seconds<60> m_gray_peerlist_housekeeping_interval;
epee::math_helper::once_a_time_seconds<3600, false> m_incoming_connections_interval;
std::list<epee::net_utils::network_address> m_priority_peers;
std::vector<epee::net_utils::network_address> m_exclusive_peers;
std::vector<epee::net_utils::network_address> m_seed_nodes;
bool m_seed_nodes_initialized = false;
boost::shared_mutex m_seed_nodes_lock;
std::atomic_flag m_fallback_seed_nodes_added;
std::vector<nodetool::peerlist_entry> m_command_line_peers;
uint64_t m_peer_livetime;
//keep connections to initiate some interactions
static boost::optional<p2p_connection_context> public_connect(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
static boost::optional<p2p_connection_context> socks_connect(network_zone&, epee::net_utils::network_address const&, epee::net_utils::ssl_support_t);
/* A `std::map` provides constant iterators and key/value pointers even with
inserts/erases to _other_ elements. This makes the configuration step easier
since references can safely be stored on the stack. Do not insert/erase
after configuration and before destruction, lock safety would need to be
added. `std::map::operator[]` WILL insert! */
std::map<epee::net_utils::zone, network_zone> m_network_zones;
std::map<std::string, time_t> m_conn_fails_cache;
epee::critical_section m_conn_fails_cache_lock;
epee::critical_section m_blocked_hosts_lock; // for both hosts and subnets
std::map<std::string, time_t> m_blocked_hosts;
std::map<epee::net_utils::ipv4_network_subnet, time_t> m_blocked_subnets;
epee::critical_section m_host_fails_score_lock;
std::map<std::string, uint64_t> m_host_fails_score;
boost::mutex m_used_stripe_peers_mutex;
std::array<std::list<epee::net_utils::network_address>, 1 << CRYPTONOTE_PRUNING_LOG_STRIPES> m_used_stripe_peers;
boost::uuids::uuid m_network_id;
cryptonote::network_type m_nettype;
epee::net_utils::ssl_support_t m_ssl_support;
};
const int64_t default_limit_up = P2P_DEFAULT_LIMIT_RATE_UP; // kB/s
const int64_t default_limit_down = P2P_DEFAULT_LIMIT_RATE_DOWN; // kB/s
extern const command_line::arg_descriptor<std::string> arg_p2p_bind_ip;
extern const command_line::arg_descriptor<std::string> arg_p2p_bind_ipv6_address;
extern const command_line::arg_descriptor<std::string, false, true, 2> arg_p2p_bind_port;
extern const command_line::arg_descriptor<std::string, false, true, 2> arg_p2p_bind_port_ipv6;
extern const command_line::arg_descriptor<bool> arg_p2p_use_ipv6;
extern const command_line::arg_descriptor<bool> arg_p2p_ignore_ipv4;
extern const command_line::arg_descriptor<uint32_t> arg_p2p_external_port;
extern const command_line::arg_descriptor<bool> arg_p2p_allow_local_ip;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_add_peer;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_add_priority_node;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_add_exclusive_node;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_seed_node;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_tx_proxy;
extern const command_line::arg_descriptor<std::vector<std::string> > arg_anonymous_inbound;
extern const command_line::arg_descriptor<bool> arg_p2p_hide_my_port;
extern const command_line::arg_descriptor<bool> arg_no_sync;
extern const command_line::arg_descriptor<bool> arg_no_igd;
extern const command_line::arg_descriptor<std::string> arg_igd;
extern const command_line::arg_descriptor<bool> arg_offline;
extern const command_line::arg_descriptor<int64_t> arg_out_peers;
extern const command_line::arg_descriptor<int64_t> arg_in_peers;
extern const command_line::arg_descriptor<int> arg_tos_flag;
extern const command_line::arg_descriptor<int64_t> arg_limit_rate_up;
extern const command_line::arg_descriptor<int64_t> arg_limit_rate_down;
extern const command_line::arg_descriptor<int64_t> arg_limit_rate;
extern const command_line::arg_descriptor<bool> arg_pad_transactions;
}
POP_WARNINGS
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