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1027 lines
38 KiB
C++
1027 lines
38 KiB
C++
/*
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* Copyright (c) 2013-2024, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#include <fstream>
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#include <iostream>
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#include <boost/property_tree/ptree.hpp>
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#include <boost/property_tree/ini_parser.hpp>
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#include "Config.h"
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#include "FS.h"
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#include "Log.h"
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#include "Identity.h"
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#include "util.h"
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#include "ClientContext.h"
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#include "HTTPProxy.h"
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#include "SOCKS.h"
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#include "MatchedDestination.h"
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namespace i2p
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{
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namespace client
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{
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ClientContext context;
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ClientContext::ClientContext (): m_SharedLocalDestination (nullptr),
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m_HttpProxy (nullptr), m_SocksProxy (nullptr), m_SamBridge (nullptr),
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m_BOBCommandChannel (nullptr), m_I2CPServer (nullptr)
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{
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}
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ClientContext::~ClientContext ()
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{
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delete m_HttpProxy;
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delete m_SocksProxy;
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delete m_SamBridge;
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delete m_BOBCommandChannel;
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delete m_I2CPServer;
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}
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void ClientContext::Start ()
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{
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// shared local destination
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if (!m_SharedLocalDestination)
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CreateNewSharedLocalDestination ();
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// addressbook
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m_AddressBook.Start ();
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// HTTP proxy
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ReadHttpProxy ();
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// SOCKS proxy
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ReadSocksProxy ();
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// I2P tunnels
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ReadTunnels ();
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// SAM
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bool sam; i2p::config::GetOption("sam.enabled", sam);
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if (sam)
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{
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std::string samAddr; i2p::config::GetOption("sam.address", samAddr);
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uint16_t samPortTCP; i2p::config::GetOption("sam.port", samPortTCP);
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uint16_t samPortUDP; i2p::config::GetOption("sam.portudp", samPortUDP);
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bool singleThread; i2p::config::GetOption("sam.singlethread", singleThread);
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LogPrint(eLogInfo, "Clients: Starting SAM bridge at ", samAddr, ":[", samPortTCP, "|", samPortUDP, "]");
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try
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{
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m_SamBridge = new SAMBridge (samAddr, samPortTCP, samPortUDP, singleThread);
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m_SamBridge->Start ();
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}
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catch (std::exception& e)
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{
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LogPrint(eLogCritical, "Clients: Exception in SAM bridge: ", e.what());
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ThrowFatal ("Unable to start SAM bridge at ", samAddr, ":[", samPortTCP, "|", samPortUDP,"]: ", e.what ());
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}
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}
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// BOB
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bool bob; i2p::config::GetOption("bob.enabled", bob);
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if (bob) {
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std::string bobAddr; i2p::config::GetOption("bob.address", bobAddr);
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uint16_t bobPort; i2p::config::GetOption("bob.port", bobPort);
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LogPrint(eLogInfo, "Clients: Starting BOB command channel at ", bobAddr, ":", bobPort);
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try
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{
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m_BOBCommandChannel = new BOBCommandChannel (bobAddr, bobPort);
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m_BOBCommandChannel->Start ();
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}
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catch (std::exception& e)
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{
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LogPrint(eLogCritical, "Clients: Exception in BOB bridge: ", e.what());
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ThrowFatal ("Unable to start BOB bridge at ", bobAddr, ":", bobPort, ": ", e.what ());
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}
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}
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// I2CP
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bool i2cp; i2p::config::GetOption("i2cp.enabled", i2cp);
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if (i2cp)
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{
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std::string i2cpAddr; i2p::config::GetOption("i2cp.address", i2cpAddr);
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uint16_t i2cpPort; i2p::config::GetOption("i2cp.port", i2cpPort);
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bool singleThread; i2p::config::GetOption("i2cp.singlethread", singleThread);
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LogPrint(eLogInfo, "Clients: Starting I2CP at ", i2cpAddr, ":", i2cpPort);
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try
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{
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m_I2CPServer = new I2CPServer (i2cpAddr, i2cpPort, singleThread);
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m_I2CPServer->Start ();
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}
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catch (std::exception& e)
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{
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LogPrint(eLogCritical, "Clients: Exception in I2CP: ", e.what());
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ThrowFatal ("Unable to start I2CP at ", i2cpAddr, ":", i2cpPort, ": ", e.what ());
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}
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}
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m_AddressBook.StartResolvers ();
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// start UDP cleanup
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if (!m_ServerForwards.empty ())
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{
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m_CleanupUDPTimer.reset (new boost::asio::deadline_timer(m_SharedLocalDestination->GetService ()));
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ScheduleCleanupUDP();
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}
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}
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void ClientContext::Stop ()
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{
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if (m_HttpProxy)
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{
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LogPrint(eLogInfo, "Clients: Stopping HTTP Proxy");
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m_HttpProxy->Stop();
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delete m_HttpProxy;
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m_HttpProxy = nullptr;
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}
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if (m_SocksProxy)
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{
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LogPrint(eLogInfo, "Clients: Stopping SOCKS Proxy");
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m_SocksProxy->Stop();
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delete m_SocksProxy;
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m_SocksProxy = nullptr;
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}
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for (auto& it: m_ClientTunnels)
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{
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LogPrint(eLogInfo, "Clients: Stopping I2P client tunnel on port ", it.first);
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it.second->Stop ();
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}
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m_ClientTunnels.clear ();
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for (auto& it: m_ServerTunnels)
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{
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LogPrint(eLogInfo, "Clients: Stopping I2P server tunnel");
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it.second->Stop ();
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}
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m_ServerTunnels.clear ();
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if (m_SamBridge)
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{
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LogPrint(eLogInfo, "Clients: Stopping SAM bridge");
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m_SamBridge->Stop ();
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delete m_SamBridge;
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m_SamBridge = nullptr;
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}
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if (m_BOBCommandChannel)
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{
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LogPrint(eLogInfo, "Clients: Stopping BOB command channel");
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m_BOBCommandChannel->Stop ();
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delete m_BOBCommandChannel;
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m_BOBCommandChannel = nullptr;
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}
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if (m_I2CPServer)
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{
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LogPrint(eLogInfo, "Clients: Stopping I2CP");
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m_I2CPServer->Stop ();
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delete m_I2CPServer;
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m_I2CPServer = nullptr;
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}
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LogPrint(eLogInfo, "Clients: Stopping AddressBook");
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m_AddressBook.Stop ();
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LogPrint(eLogInfo, "Clients: Stopping UDP Tunnels");
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{
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std::lock_guard<std::mutex> lock(m_ForwardsMutex);
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m_ServerForwards.clear();
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m_ClientForwards.clear();
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}
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LogPrint(eLogInfo, "Clients: Stopping UDP Tunnels timers");
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if (m_CleanupUDPTimer)
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{
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m_CleanupUDPTimer->cancel ();
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m_CleanupUDPTimer = nullptr;
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}
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{
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LogPrint(eLogInfo, "Clients: Stopping Destinations");
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std::lock_guard<std::mutex> lock(m_DestinationsMutex);
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for (auto& it: m_Destinations)
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it.second->Stop ();
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LogPrint(eLogInfo, "Clients: Stopping Destinations - Clear");
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m_Destinations.clear ();
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}
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LogPrint(eLogInfo, "Clients: Stopping SharedLocalDestination");
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m_SharedLocalDestination->Release ();
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m_SharedLocalDestination = nullptr;
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}
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void ClientContext::ReloadConfig ()
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{
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// TODO: handle config changes
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/*std::string config; i2p::config::GetOption("conf", config);
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i2p::config::ParseConfig(config);*/
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// change shared local destination
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m_SharedLocalDestination->Release ();
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CreateNewSharedLocalDestination ();
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// recreate HTTP proxy
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if (m_HttpProxy)
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{
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m_HttpProxy->Stop ();
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delete m_HttpProxy;
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m_HttpProxy = nullptr;
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}
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ReadHttpProxy ();
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// recreate SOCKS proxy
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if (m_SocksProxy)
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{
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m_SocksProxy->Stop ();
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delete m_SocksProxy;
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m_SocksProxy = nullptr;
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}
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ReadSocksProxy ();
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// handle tunnels
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// reset isUpdated for each tunnel
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VisitTunnels (false);
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// reload tunnels
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ReadTunnels();
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// delete not updated tunnels (not in config anymore)
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VisitTunnels (true);
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// delete unused destinations
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std::unique_lock<std::mutex> l(m_DestinationsMutex);
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for (auto it = m_Destinations.begin (); it != m_Destinations.end ();)
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{
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auto dest = it->second;
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if (dest->GetRefCounter () > 0) ++it; // skip
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else
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{
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dest->Stop ();
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it = m_Destinations.erase (it);
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}
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}
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}
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bool ClientContext::LoadPrivateKeys (i2p::data::PrivateKeys& keys, const std::string& filename,
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i2p::data::SigningKeyType sigType, i2p::data::CryptoKeyType cryptoType)
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{
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static const std::string transient("transient");
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if (!filename.compare (0, transient.length (), transient)) // starts with transient
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{
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keys = i2p::data::PrivateKeys::CreateRandomKeys (sigType, cryptoType, true);
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LogPrint (eLogInfo, "Clients: New transient keys address ", m_AddressBook.ToAddress(keys.GetPublic ()->GetIdentHash ()), " created");
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return true;
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}
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bool success = true;
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std::string fullPath = i2p::fs::DataDirPath (filename);
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std::ifstream s(fullPath, std::ifstream::binary);
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if (s.is_open ())
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{
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s.seekg (0, std::ios::end);
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size_t len = s.tellg();
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s.seekg (0, std::ios::beg);
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uint8_t * buf = new uint8_t[len];
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s.read ((char *)buf, len);
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if(!keys.FromBuffer (buf, len))
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{
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LogPrint (eLogCritical, "Clients: Failed to load keyfile ", filename);
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success = false;
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}
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else
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LogPrint (eLogInfo, "Clients: Local address ", m_AddressBook.ToAddress(keys.GetPublic ()->GetIdentHash ()), " loaded");
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delete[] buf;
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}
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else
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{
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LogPrint (eLogCritical, "Clients: Can't open file ", fullPath, " Creating new one with signature type ", sigType, " crypto type ", cryptoType);
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keys = i2p::data::PrivateKeys::CreateRandomKeys (sigType, cryptoType, true);
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std::ofstream f (fullPath, std::ofstream::binary | std::ofstream::out);
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size_t len = keys.GetFullLen ();
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uint8_t * buf = new uint8_t[len];
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len = keys.ToBuffer (buf, len);
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f.write ((char *)buf, len);
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delete[] buf;
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LogPrint (eLogInfo, "Clients: New private keys file ", fullPath, " for ", m_AddressBook.ToAddress(keys.GetPublic ()->GetIdentHash ()), " created");
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}
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return success;
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}
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std::vector<std::shared_ptr<DatagramSessionInfo> > ClientContext::GetForwardInfosFor(const i2p::data::IdentHash & destination)
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{
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std::vector<std::shared_ptr<DatagramSessionInfo> > infos;
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std::lock_guard<std::mutex> lock(m_ForwardsMutex);
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for(const auto & c : m_ClientForwards)
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{
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if (c.second->IsLocalDestination(destination))
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{
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for (auto & i : c.second->GetSessions()) infos.push_back(i);
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break;
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}
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}
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for(const auto & s : m_ServerForwards)
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{
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if(std::get<0>(s.first) == destination)
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{
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for( auto & i : s.second->GetSessions()) infos.push_back(i);
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break;
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}
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}
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return infos;
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}
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std::shared_ptr<ClientDestination> ClientContext::CreateNewLocalDestination (bool isPublic,
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i2p::data::SigningKeyType sigType, i2p::data::CryptoKeyType cryptoType,
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const std::map<std::string, std::string> * params)
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{
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i2p::data::PrivateKeys keys = i2p::data::PrivateKeys::CreateRandomKeys (sigType, cryptoType, true);
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auto localDestination = std::make_shared<RunnableClientDestination> (keys, isPublic, params);
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AddLocalDestination (localDestination);
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return localDestination;
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}
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std::shared_ptr<ClientDestination> ClientContext::CreateNewLocalDestination (
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boost::asio::io_service& service, bool isPublic,
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i2p::data::SigningKeyType sigType, i2p::data::CryptoKeyType cryptoType,
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const std::map<std::string, std::string> * params)
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{
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i2p::data::PrivateKeys keys = i2p::data::PrivateKeys::CreateRandomKeys (sigType, cryptoType, true);
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auto localDestination = std::make_shared<ClientDestination> (service, keys, isPublic, params);
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AddLocalDestination (localDestination);
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return localDestination;
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}
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std::shared_ptr<ClientDestination> ClientContext::CreateNewMatchedTunnelDestination(const i2p::data::PrivateKeys &keys, const std::string & name, const std::map<std::string, std::string> * params)
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{
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auto localDestination = std::make_shared<MatchedTunnelDestination>(keys, name, params);
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AddLocalDestination (localDestination);
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return localDestination;
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}
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void ClientContext::AddLocalDestination (std::shared_ptr<ClientDestination> localDestination)
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{
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std::unique_lock<std::mutex> l(m_DestinationsMutex);
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m_Destinations[localDestination->GetIdentHash ()] = localDestination;
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localDestination->Start ();
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}
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void ClientContext::DeleteLocalDestination (std::shared_ptr<ClientDestination> destination)
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{
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if (!destination) return;
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auto it = m_Destinations.find (destination->GetIdentHash ());
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if (it != m_Destinations.end ())
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{
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auto d = it->second;
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{
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std::unique_lock<std::mutex> l(m_DestinationsMutex);
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m_Destinations.erase (it);
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}
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d->Stop ();
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}
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}
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std::shared_ptr<ClientDestination> ClientContext::CreateNewLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic,
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const std::map<std::string, std::string> * params)
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{
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auto it = m_Destinations.find (keys.GetPublic ()->GetIdentHash ());
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if (it != m_Destinations.end ())
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{
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LogPrint (eLogWarning, "Clients: Local destination ", m_AddressBook.ToAddress(keys.GetPublic ()->GetIdentHash ()), " exists");
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it->second->Start (); // make sure to start
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return it->second;
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}
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auto localDestination = std::make_shared<RunnableClientDestination> (keys, isPublic, params);
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AddLocalDestination (localDestination);
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return localDestination;
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}
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std::shared_ptr<ClientDestination> ClientContext::CreateNewLocalDestination (boost::asio::io_service& service,
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const i2p::data::PrivateKeys& keys, bool isPublic, const std::map<std::string, std::string> * params)
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{
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auto it = m_Destinations.find (keys.GetPublic ()->GetIdentHash ());
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if (it != m_Destinations.end ())
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{
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LogPrint (eLogWarning, "Clients: Local destination ", m_AddressBook.ToAddress(keys.GetPublic ()->GetIdentHash ()), " exists");
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it->second->Start (); // make sure to start
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return it->second;
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}
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auto localDestination = std::make_shared<ClientDestination> (service, keys, isPublic, params);
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AddLocalDestination (localDestination);
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return localDestination;
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}
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void ClientContext::CreateNewSharedLocalDestination ()
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{
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std::map<std::string, std::string> params
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{
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{ I2CP_PARAM_INBOUND_TUNNELS_QUANTITY, "3" },
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{ I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY, "3" },
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{ I2CP_PARAM_LEASESET_TYPE, "3" },
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{ I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, "0,4" }
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};
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m_SharedLocalDestination = CreateNewLocalDestination (false, i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519,
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i2p::data::CRYPTO_KEY_TYPE_ELGAMAL, ¶ms); // non-public, EDDSA
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m_SharedLocalDestination->Acquire ();
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}
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std::shared_ptr<ClientDestination> ClientContext::FindLocalDestination (const i2p::data::IdentHash& destination) const
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{
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auto it = m_Destinations.find (destination);
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if (it != m_Destinations.end ())
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return it->second;
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return nullptr;
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}
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template<typename Section, typename Type>
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std::string ClientContext::GetI2CPOption (const Section& section, const std::string& name, const Type& value) const
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{
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return section.second.get (boost::property_tree::ptree::path_type (name, '/'), std::to_string (value));
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}
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template<typename Section>
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std::string ClientContext::GetI2CPStringOption (const Section& section, const std::string& name, const std::string& value) const
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{
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return section.second.get (boost::property_tree::ptree::path_type (name, '/'), value);
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}
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template<typename Section>
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void ClientContext::ReadI2CPOptionsGroup (const Section& section, const std::string& group, std::map<std::string, std::string>& options) const
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{
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for (auto it: section.second)
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{
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if (it.first.length () >= group.length () && !it.first.compare (0, group.length (), group))
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options[it.first] = it.second.get_value ("");
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}
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}
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template<typename Section>
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void ClientContext::ReadI2CPOptions (const Section& section, bool isServer, std::map<std::string, std::string>& options) const
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{
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options[I2CP_PARAM_INBOUND_TUNNEL_LENGTH] = GetI2CPOption (section, I2CP_PARAM_INBOUND_TUNNEL_LENGTH, DEFAULT_INBOUND_TUNNEL_LENGTH);
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options[I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH] = GetI2CPOption (section, I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH, DEFAULT_OUTBOUND_TUNNEL_LENGTH);
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options[I2CP_PARAM_INBOUND_TUNNELS_QUANTITY] = GetI2CPOption (section, I2CP_PARAM_INBOUND_TUNNELS_QUANTITY, DEFAULT_INBOUND_TUNNELS_QUANTITY);
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options[I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY] = GetI2CPOption (section, I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY, DEFAULT_OUTBOUND_TUNNELS_QUANTITY);
|
|
options[I2CP_PARAM_INBOUND_TUNNELS_LENGTH_VARIANCE] = GetI2CPOption (section, I2CP_PARAM_INBOUND_TUNNELS_LENGTH_VARIANCE, DEFAULT_INBOUND_TUNNELS_LENGTH_VARIANCE);
|
|
options[I2CP_PARAM_OUTBOUND_TUNNELS_LENGTH_VARIANCE] = GetI2CPOption (section, I2CP_PARAM_OUTBOUND_TUNNELS_LENGTH_VARIANCE, DEFAULT_OUTBOUND_TUNNELS_LENGTH_VARIANCE);
|
|
options[I2CP_PARAM_TAGS_TO_SEND] = GetI2CPOption (section, I2CP_PARAM_TAGS_TO_SEND, DEFAULT_TAGS_TO_SEND);
|
|
options[I2CP_PARAM_MIN_TUNNEL_LATENCY] = GetI2CPOption(section, I2CP_PARAM_MIN_TUNNEL_LATENCY, DEFAULT_MIN_TUNNEL_LATENCY);
|
|
options[I2CP_PARAM_MAX_TUNNEL_LATENCY] = GetI2CPOption(section, I2CP_PARAM_MAX_TUNNEL_LATENCY, DEFAULT_MAX_TUNNEL_LATENCY);
|
|
options[I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY] = GetI2CPOption(section, I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY, DEFAULT_INITIAL_ACK_DELAY);
|
|
options[I2CP_PARAM_STREAMING_ANSWER_PINGS] = GetI2CPOption(section, I2CP_PARAM_STREAMING_ANSWER_PINGS, isServer ? DEFAULT_ANSWER_PINGS : false);
|
|
options[I2CP_PARAM_LEASESET_TYPE] = GetI2CPOption(section, I2CP_PARAM_LEASESET_TYPE, DEFAULT_LEASESET_TYPE);
|
|
std::string encType = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, "0,4");
|
|
if (encType.length () > 0) options[I2CP_PARAM_LEASESET_ENCRYPTION_TYPE] = encType;
|
|
std::string privKey = GetI2CPStringOption(section, I2CP_PARAM_LEASESET_PRIV_KEY, "");
|
|
if (privKey.length () > 0) options[I2CP_PARAM_LEASESET_PRIV_KEY] = privKey;
|
|
auto authType = GetI2CPOption(section, I2CP_PARAM_LEASESET_AUTH_TYPE, 0);
|
|
if (authType != "0") // auth is set
|
|
{
|
|
options[I2CP_PARAM_LEASESET_AUTH_TYPE] = authType;
|
|
if (authType == "1") // DH
|
|
ReadI2CPOptionsGroup (section, I2CP_PARAM_LEASESET_CLIENT_DH, options);
|
|
else if (authType == "2") // PSK
|
|
ReadI2CPOptionsGroup (section, I2CP_PARAM_LEASESET_CLIENT_PSK, options);
|
|
}
|
|
std::string explicitPeers = GetI2CPStringOption(section, I2CP_PARAM_EXPLICIT_PEERS, "");
|
|
if (explicitPeers.length () > 0) options[I2CP_PARAM_EXPLICIT_PEERS] = explicitPeers;
|
|
std::string ratchetInboundTags = GetI2CPStringOption(section, I2CP_PARAM_RATCHET_INBOUND_TAGS, "");
|
|
if (ratchetInboundTags.length () > 0) options[I2CP_PARAM_RATCHET_INBOUND_TAGS] = ratchetInboundTags;
|
|
}
|
|
|
|
void ClientContext::ReadI2CPOptionsFromConfig (const std::string& prefix, std::map<std::string, std::string>& options) const
|
|
{
|
|
std::string value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_INBOUND_TUNNEL_LENGTH, value))
|
|
options[I2CP_PARAM_INBOUND_TUNNEL_LENGTH] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_INBOUND_TUNNELS_QUANTITY, value))
|
|
options[I2CP_PARAM_INBOUND_TUNNELS_QUANTITY] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_INBOUND_TUNNELS_LENGTH_VARIANCE, value))
|
|
options[I2CP_PARAM_INBOUND_TUNNELS_LENGTH_VARIANCE] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH, value))
|
|
options[I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY, value))
|
|
options[I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_OUTBOUND_TUNNELS_LENGTH_VARIANCE, value))
|
|
options[I2CP_PARAM_OUTBOUND_TUNNELS_LENGTH_VARIANCE] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_MIN_TUNNEL_LATENCY, value))
|
|
options[I2CP_PARAM_MIN_TUNNEL_LATENCY] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_MAX_TUNNEL_LATENCY, value))
|
|
options[I2CP_PARAM_MAX_TUNNEL_LATENCY] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_LEASESET_TYPE, value))
|
|
options[I2CP_PARAM_LEASESET_TYPE] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_LEASESET_ENCRYPTION_TYPE, value))
|
|
options[I2CP_PARAM_LEASESET_ENCRYPTION_TYPE] = value;
|
|
if (i2p::config::GetOption(prefix + I2CP_PARAM_LEASESET_PRIV_KEY, value) && !value.empty ())
|
|
options[I2CP_PARAM_LEASESET_PRIV_KEY] = value;
|
|
}
|
|
|
|
void ClientContext::ReadTunnels ()
|
|
{
|
|
int numClientTunnels = 0, numServerTunnels = 0;
|
|
std::string tunConf; i2p::config::GetOption("tunconf", tunConf);
|
|
if (tunConf.empty ())
|
|
tunConf = i2p::fs::DataDirPath ("tunnels.conf");
|
|
|
|
LogPrint(eLogDebug, "Clients: Tunnels config file: ", tunConf);
|
|
ReadTunnels (tunConf, numClientTunnels, numServerTunnels);
|
|
|
|
std::string tunDir; i2p::config::GetOption("tunnelsdir", tunDir);
|
|
if (tunDir.empty ())
|
|
tunDir = i2p::fs::DataDirPath ("tunnels.d");
|
|
|
|
if (i2p::fs::Exists (tunDir))
|
|
{
|
|
std::vector<std::string> files;
|
|
if (i2p::fs::ReadDir (tunDir, files))
|
|
{
|
|
for (auto& it: files)
|
|
{
|
|
if (it.substr(it.size() - 5) != ".conf") continue; // skip files which not ends with ".conf"
|
|
LogPrint(eLogDebug, "Clients: Tunnels extra config file: ", it);
|
|
ReadTunnels (it, numClientTunnels, numServerTunnels);
|
|
}
|
|
}
|
|
}
|
|
|
|
LogPrint (eLogInfo, "Clients: ", numClientTunnels, " I2P client tunnels created");
|
|
LogPrint (eLogInfo, "Clients: ", numServerTunnels, " I2P server tunnels created");
|
|
}
|
|
|
|
void ClientContext::ReadTunnels (const std::string& tunConf, int& numClientTunnels, int& numServerTunnels)
|
|
{
|
|
boost::property_tree::ptree pt;
|
|
try {
|
|
boost::property_tree::read_ini (tunConf, pt);
|
|
} catch (std::exception& ex) {
|
|
LogPrint (eLogWarning, "Clients: Can't read ", tunConf, ": ", ex.what ());
|
|
return;
|
|
}
|
|
|
|
std::map<std::string, std::shared_ptr<ClientDestination> > destinations; // keys -> destination
|
|
for (auto& section: pt)
|
|
{
|
|
std::string name = section.first;
|
|
try
|
|
{
|
|
std::string type = section.second.get<std::string> (I2P_TUNNELS_SECTION_TYPE);
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_CLIENT
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_SOCKS
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_WEBSOCKS
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_HTTPPROXY
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT)
|
|
{
|
|
// mandatory params
|
|
std::string dest;
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_CLIENT || type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT)
|
|
dest = section.second.get<std::string> (I2P_CLIENT_TUNNEL_DESTINATION);
|
|
uint16_t port = section.second.get<uint16_t> (I2P_CLIENT_TUNNEL_PORT);
|
|
// optional params
|
|
bool matchTunnels = section.second.get (I2P_CLIENT_TUNNEL_MATCH_TUNNELS, false);
|
|
std::string keys = section.second.get<std::string> (I2P_CLIENT_TUNNEL_KEYS, "transient");
|
|
std::string address = section.second.get<std::string> (I2P_CLIENT_TUNNEL_ADDRESS, "127.0.0.1");
|
|
uint16_t destinationPort = section.second.get<uint16_t> (I2P_CLIENT_TUNNEL_DESTINATION_PORT, 0);
|
|
i2p::data::SigningKeyType sigType = section.second.get (I2P_CLIENT_TUNNEL_SIGNATURE_TYPE, i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519);
|
|
i2p::data::CryptoKeyType cryptoType = section.second.get (I2P_CLIENT_TUNNEL_CRYPTO_TYPE, i2p::data::CRYPTO_KEY_TYPE_ELGAMAL);
|
|
// I2CP
|
|
std::map<std::string, std::string> options;
|
|
ReadI2CPOptions (section, false, options);
|
|
|
|
std::shared_ptr<ClientDestination> localDestination = nullptr;
|
|
if (keys.length () > 0)
|
|
{
|
|
auto it = destinations.find (keys);
|
|
if (it != destinations.end ())
|
|
localDestination = it->second;
|
|
else
|
|
{
|
|
i2p::data::PrivateKeys k;
|
|
if(LoadPrivateKeys (k, keys, sigType, cryptoType))
|
|
{
|
|
localDestination = FindLocalDestination (k.GetPublic ()->GetIdentHash ());
|
|
if (!localDestination)
|
|
{
|
|
if(matchTunnels)
|
|
localDestination = CreateNewMatchedTunnelDestination(k, dest, &options);
|
|
else
|
|
localDestination = CreateNewLocalDestination (k, type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT, &options);
|
|
if (keys != "transient")
|
|
destinations[keys] = localDestination;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT) {
|
|
// udp client
|
|
// TODO: hostnames
|
|
boost::asio::ip::udp::endpoint end (boost::asio::ip::address::from_string(address), port);
|
|
if (!localDestination)
|
|
localDestination = m_SharedLocalDestination;
|
|
|
|
bool gzip = section.second.get (I2P_CLIENT_TUNNEL_GZIP, true);
|
|
auto clientTunnel = std::make_shared<I2PUDPClientTunnel> (name, dest, end, localDestination, destinationPort, gzip);
|
|
|
|
auto ins = m_ClientForwards.insert (std::make_pair (end, clientTunnel));
|
|
if (ins.second)
|
|
{
|
|
clientTunnel->Start ();
|
|
numClientTunnels++;
|
|
}
|
|
else
|
|
{
|
|
// TODO: update
|
|
if (ins.first->second->GetLocalDestination () != clientTunnel->GetLocalDestination ())
|
|
{
|
|
LogPrint (eLogInfo, "Clients: I2P UDP client tunnel destination updated");
|
|
ins.first->second->Stop ();
|
|
ins.first->second->SetLocalDestination (clientTunnel->GetLocalDestination ());
|
|
ins.first->second->Start ();
|
|
}
|
|
ins.first->second->isUpdated = true;
|
|
LogPrint(eLogError, "Clients: I2P Client forward for endpoint ", end, " already exists");
|
|
}
|
|
|
|
} else {
|
|
boost::asio::ip::tcp::endpoint clientEndpoint;
|
|
std::shared_ptr<I2PService> clientTunnel;
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_SOCKS)
|
|
{
|
|
// socks proxy
|
|
std::string outproxy = section.second.get("outproxy", "");
|
|
auto tun = std::make_shared<i2p::proxy::SOCKSProxy>(name, address, port, !outproxy.empty(), outproxy, destinationPort, localDestination);
|
|
clientTunnel = tun;
|
|
clientEndpoint = tun->GetLocalEndpoint ();
|
|
}
|
|
else if (type == I2P_TUNNELS_SECTION_TYPE_HTTPPROXY)
|
|
{
|
|
// http proxy
|
|
std::string outproxy = section.second.get("outproxy", "");
|
|
bool addresshelper = section.second.get("addresshelper", true);
|
|
auto tun = std::make_shared<i2p::proxy::HTTPProxy>(name, address, port, outproxy, addresshelper, localDestination);
|
|
clientTunnel = tun;
|
|
clientEndpoint = tun->GetLocalEndpoint ();
|
|
}
|
|
else if (type == I2P_TUNNELS_SECTION_TYPE_WEBSOCKS)
|
|
{
|
|
LogPrint(eLogWarning, "Clients: I2P Client tunnel websocks is deprecated, not starting ", name, " tunnel");
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
// tcp client
|
|
auto tun = std::make_shared<I2PClientTunnel> (name, dest, address, port, localDestination, destinationPort);
|
|
clientTunnel = tun;
|
|
clientEndpoint = tun->GetLocalEndpoint ();
|
|
|
|
uint32_t keepAlive = section.second.get<uint32_t>(I2P_CLIENT_TUNNEL_KEEP_ALIVE_INTERVAL, 0);
|
|
if (keepAlive)
|
|
{
|
|
tun->SetKeepAliveInterval (keepAlive);
|
|
LogPrint(eLogInfo, "Clients: I2P Client tunnel keep alive interval set to ", keepAlive);
|
|
}
|
|
}
|
|
|
|
uint32_t timeout = section.second.get<uint32_t>(I2P_CLIENT_TUNNEL_CONNECT_TIMEOUT, 0);
|
|
if(timeout)
|
|
{
|
|
clientTunnel->SetConnectTimeout(timeout);
|
|
LogPrint(eLogInfo, "Clients: I2P Client tunnel connect timeout set to ", timeout);
|
|
}
|
|
|
|
auto ins = m_ClientTunnels.insert (std::make_pair (clientEndpoint, clientTunnel));
|
|
if (ins.second)
|
|
{
|
|
clientTunnel->Start ();
|
|
numClientTunnels++;
|
|
}
|
|
else
|
|
{
|
|
// TODO: update
|
|
if (ins.first->second->GetLocalDestination () != clientTunnel->GetLocalDestination ())
|
|
{
|
|
LogPrint (eLogInfo, "Clients: I2P client tunnel destination updated");
|
|
ins.first->second->Stop ();
|
|
ins.first->second->SetLocalDestination (clientTunnel->GetLocalDestination ());
|
|
ins.first->second->Start ();
|
|
}
|
|
ins.first->second->isUpdated = true;
|
|
LogPrint (eLogInfo, "Clients: I2P client tunnel for endpoint ", clientEndpoint, " already exists");
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (type == I2P_TUNNELS_SECTION_TYPE_SERVER
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_HTTP
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_IRC
|
|
|| type == I2P_TUNNELS_SECTION_TYPE_UDPSERVER)
|
|
{
|
|
// mandatory params
|
|
std::string host = section.second.get<std::string> (I2P_SERVER_TUNNEL_HOST);
|
|
uint16_t port = section.second.get<uint16_t> (I2P_SERVER_TUNNEL_PORT);
|
|
std::string keys = section.second.get<std::string> (I2P_SERVER_TUNNEL_KEYS);
|
|
// optional params
|
|
uint16_t inPort = section.second.get<uint16_t> (I2P_SERVER_TUNNEL_INPORT, port);
|
|
std::string accessList = section.second.get<std::string> (I2P_SERVER_TUNNEL_ACCESS_LIST, "");
|
|
if(accessList == "")
|
|
accessList = section.second.get<std::string> (I2P_SERVER_TUNNEL_WHITE_LIST, "");
|
|
std::string hostOverride = section.second.get<std::string> (I2P_SERVER_TUNNEL_HOST_OVERRIDE, "");
|
|
std::string webircpass = section.second.get<std::string> (I2P_SERVER_TUNNEL_WEBIRC_PASSWORD, "");
|
|
bool gzip = section.second.get (I2P_SERVER_TUNNEL_GZIP, false);
|
|
i2p::data::SigningKeyType sigType = section.second.get (I2P_SERVER_TUNNEL_SIGNATURE_TYPE, i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519);
|
|
i2p::data::CryptoKeyType cryptoType = section.second.get (I2P_CLIENT_TUNNEL_CRYPTO_TYPE, i2p::data::CRYPTO_KEY_TYPE_ELGAMAL);
|
|
|
|
std::string address = section.second.get<std::string> (I2P_SERVER_TUNNEL_ADDRESS, "");
|
|
bool isUniqueLocal = section.second.get (I2P_SERVER_TUNNEL_ENABLE_UNIQUE_LOCAL, true);
|
|
bool ssl = section.second.get (I2P_SERVER_TUNNEL_SSL, false);
|
|
|
|
// I2CP
|
|
std::map<std::string, std::string> options;
|
|
ReadI2CPOptions (section, true, options);
|
|
|
|
std::shared_ptr<ClientDestination> localDestination = nullptr;
|
|
auto it = destinations.find (keys);
|
|
if (it != destinations.end ())
|
|
{
|
|
localDestination = it->second;
|
|
localDestination->SetPublic (true);
|
|
}
|
|
else
|
|
{
|
|
i2p::data::PrivateKeys k;
|
|
if(!LoadPrivateKeys (k, keys, sigType, cryptoType))
|
|
continue;
|
|
localDestination = FindLocalDestination (k.GetPublic ()->GetIdentHash ());
|
|
if (!localDestination)
|
|
{
|
|
localDestination = CreateNewLocalDestination (k, true, &options);
|
|
destinations[keys] = localDestination;
|
|
}
|
|
else
|
|
localDestination->SetPublic (true);
|
|
}
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_UDPSERVER)
|
|
{
|
|
// udp server tunnel
|
|
// TODO: hostnames
|
|
boost::asio::ip::udp::endpoint endpoint(boost::asio::ip::address::from_string(host), port);
|
|
if (address.empty ())
|
|
{
|
|
if (!endpoint.address ().is_unspecified () && endpoint.address ().is_v6 ())
|
|
address = "::1";
|
|
else
|
|
address = "127.0.0.1";
|
|
}
|
|
auto localAddress = boost::asio::ip::address::from_string(address);
|
|
auto serverTunnel = std::make_shared<I2PUDPServerTunnel>(name, localDestination, localAddress, endpoint, inPort, gzip);
|
|
if(!isUniqueLocal)
|
|
{
|
|
LogPrint(eLogInfo, "Clients: Disabling loopback address mapping");
|
|
serverTunnel->SetUniqueLocal(isUniqueLocal);
|
|
}
|
|
std::lock_guard<std::mutex> lock(m_ForwardsMutex);
|
|
auto ins = m_ServerForwards.insert(std::make_pair(
|
|
std::make_pair(localDestination->GetIdentHash(), port),
|
|
serverTunnel));
|
|
if (ins.second)
|
|
{
|
|
serverTunnel->Start();
|
|
LogPrint(eLogInfo, "Clients: I2P Server Forward created for UDP Endpoint ", host, ":", port, " bound on ", address, " for ",localDestination->GetIdentHash().ToBase32());
|
|
}
|
|
else
|
|
{
|
|
ins.first->second->isUpdated = true;
|
|
LogPrint(eLogError, "Clients: I2P Server Forward for destination/port ", m_AddressBook.ToAddress(localDestination->GetIdentHash()), "/", port, " already exists");
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
std::shared_ptr<I2PServerTunnel> serverTunnel;
|
|
if (type == I2P_TUNNELS_SECTION_TYPE_HTTP)
|
|
serverTunnel = std::make_shared<I2PServerTunnelHTTP> (name, host, port, localDestination, hostOverride, inPort, gzip);
|
|
else if (type == I2P_TUNNELS_SECTION_TYPE_IRC)
|
|
serverTunnel = std::make_shared<I2PServerTunnelIRC> (name, host, port, localDestination, webircpass, inPort, gzip);
|
|
else // regular server tunnel by default
|
|
serverTunnel = std::make_shared<I2PServerTunnel> (name, host, port, localDestination, inPort, gzip);
|
|
|
|
if (!address.empty ())
|
|
serverTunnel->SetLocalAddress (address);
|
|
if (!isUniqueLocal)
|
|
{
|
|
LogPrint(eLogInfo, "Clients: Disabling loopback address mapping");
|
|
serverTunnel->SetUniqueLocal(isUniqueLocal);
|
|
}
|
|
if (ssl)
|
|
serverTunnel->SetSSL (true);
|
|
if (accessList.length () > 0)
|
|
{
|
|
std::set<i2p::data::IdentHash> idents;
|
|
size_t pos = 0, comma;
|
|
do
|
|
{
|
|
comma = accessList.find (',', pos);
|
|
i2p::data::IdentHash ident;
|
|
ident.FromBase32 (accessList.substr (pos, comma != std::string::npos ? comma - pos : std::string::npos));
|
|
idents.insert (ident);
|
|
pos = comma + 1;
|
|
}
|
|
while (comma != std::string::npos);
|
|
serverTunnel->SetAccessList (idents);
|
|
}
|
|
auto ins = m_ServerTunnels.insert (std::make_pair (
|
|
std::make_pair (localDestination->GetIdentHash (), inPort),
|
|
serverTunnel));
|
|
if (ins.second)
|
|
{
|
|
serverTunnel->Start ();
|
|
numServerTunnels++;
|
|
}
|
|
else
|
|
{
|
|
// TODO: update
|
|
if (ins.first->second->GetLocalDestination () != serverTunnel->GetLocalDestination ())
|
|
{
|
|
LogPrint (eLogInfo, "Clients: I2P server tunnel destination updated");
|
|
ins.first->second->Stop ();
|
|
ins.first->second->SetLocalDestination (serverTunnel->GetLocalDestination ());
|
|
ins.first->second->Start ();
|
|
}
|
|
ins.first->second->isUpdated = true;
|
|
LogPrint (eLogInfo, "Clients: I2P server tunnel for destination/port ", m_AddressBook.ToAddress(localDestination->GetIdentHash ()), "/", inPort, " already exists");
|
|
}
|
|
|
|
}
|
|
else
|
|
LogPrint (eLogWarning, "Clients: Unknown section type = ", type, " of ", name, " in ", tunConf);
|
|
}
|
|
catch (std::exception& ex)
|
|
{
|
|
LogPrint (eLogCritical, "Clients: Can't read tunnel ", name, " params: ", ex.what ());
|
|
ThrowFatal ("Unable to start tunnel ", name, ": ", ex.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClientContext::ReadHttpProxy ()
|
|
{
|
|
std::shared_ptr<ClientDestination> localDestination;
|
|
bool httproxy; i2p::config::GetOption("httpproxy.enabled", httproxy);
|
|
if (httproxy)
|
|
{
|
|
std::string httpProxyKeys; i2p::config::GetOption("httpproxy.keys", httpProxyKeys);
|
|
std::string httpProxyAddr; i2p::config::GetOption("httpproxy.address", httpProxyAddr);
|
|
uint16_t httpProxyPort; i2p::config::GetOption("httpproxy.port", httpProxyPort);
|
|
std::string httpOutProxyURL; i2p::config::GetOption("httpproxy.outproxy", httpOutProxyURL);
|
|
bool httpAddresshelper; i2p::config::GetOption("httpproxy.addresshelper", httpAddresshelper);
|
|
if (httpAddresshelper)
|
|
i2p::config::GetOption("addressbook.enabled", httpAddresshelper); // addresshelper is not supported without address book
|
|
i2p::data::SigningKeyType sigType; i2p::config::GetOption("httpproxy.signaturetype", sigType);
|
|
LogPrint(eLogInfo, "Clients: Starting HTTP Proxy at ", httpProxyAddr, ":", httpProxyPort);
|
|
if (httpProxyKeys.length () > 0)
|
|
{
|
|
i2p::data::PrivateKeys keys;
|
|
if(LoadPrivateKeys (keys, httpProxyKeys, sigType))
|
|
{
|
|
std::map<std::string, std::string> params;
|
|
ReadI2CPOptionsFromConfig ("httpproxy.", params);
|
|
localDestination = CreateNewLocalDestination (keys, false, ¶ms);
|
|
if (localDestination) localDestination->Acquire ();
|
|
}
|
|
else
|
|
LogPrint(eLogCritical, "Clients: Failed to load HTTP Proxy key");
|
|
}
|
|
try
|
|
{
|
|
m_HttpProxy = new i2p::proxy::HTTPProxy("HTTP Proxy", httpProxyAddr, httpProxyPort, httpOutProxyURL, httpAddresshelper, localDestination);
|
|
m_HttpProxy->Start();
|
|
}
|
|
catch (std::exception& e)
|
|
{
|
|
LogPrint(eLogCritical, "Clients: Exception in HTTP Proxy: ", e.what());
|
|
ThrowFatal ("Unable to start HTTP Proxy at ", httpProxyAddr, ":", httpProxyPort, ": ", e.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClientContext::ReadSocksProxy ()
|
|
{
|
|
std::shared_ptr<ClientDestination> localDestination;
|
|
bool socksproxy; i2p::config::GetOption("socksproxy.enabled", socksproxy);
|
|
if (socksproxy)
|
|
{
|
|
std::string httpProxyKeys; i2p::config::GetOption("httpproxy.keys", httpProxyKeys);
|
|
// we still need httpProxyKeys to compare with sockProxyKeys
|
|
std::string socksProxyKeys; i2p::config::GetOption("socksproxy.keys", socksProxyKeys);
|
|
std::string socksProxyAddr; i2p::config::GetOption("socksproxy.address", socksProxyAddr);
|
|
uint16_t socksProxyPort; i2p::config::GetOption("socksproxy.port", socksProxyPort);
|
|
bool socksOutProxy; i2p::config::GetOption("socksproxy.outproxy.enabled", socksOutProxy);
|
|
std::string socksOutProxyAddr; i2p::config::GetOption("socksproxy.outproxy", socksOutProxyAddr);
|
|
uint16_t socksOutProxyPort; i2p::config::GetOption("socksproxy.outproxyport", socksOutProxyPort);
|
|
i2p::data::SigningKeyType sigType; i2p::config::GetOption("socksproxy.signaturetype", sigType);
|
|
LogPrint(eLogInfo, "Clients: Starting SOCKS Proxy at ", socksProxyAddr, ":", socksProxyPort);
|
|
if (httpProxyKeys == socksProxyKeys && m_HttpProxy)
|
|
{
|
|
localDestination = m_HttpProxy->GetLocalDestination ();
|
|
localDestination->Acquire ();
|
|
}
|
|
else if (socksProxyKeys.length () > 0)
|
|
{
|
|
i2p::data::PrivateKeys keys;
|
|
if (LoadPrivateKeys (keys, socksProxyKeys, sigType))
|
|
{
|
|
std::map<std::string, std::string> params;
|
|
ReadI2CPOptionsFromConfig ("socksproxy.", params);
|
|
localDestination = CreateNewLocalDestination (keys, false, ¶ms);
|
|
if (localDestination) localDestination->Acquire ();
|
|
}
|
|
else
|
|
LogPrint(eLogCritical, "Clients: Failed to load SOCKS Proxy key");
|
|
}
|
|
try
|
|
{
|
|
m_SocksProxy = new i2p::proxy::SOCKSProxy("SOCKS", socksProxyAddr, socksProxyPort,
|
|
socksOutProxy, socksOutProxyAddr, socksOutProxyPort, localDestination);
|
|
m_SocksProxy->Start();
|
|
}
|
|
catch (std::exception& e)
|
|
{
|
|
LogPrint(eLogCritical, "Clients: Exception in SOCKS Proxy: ", e.what());
|
|
ThrowFatal ("Unable to start SOCKS Proxy at ", socksProxyAddr, ":", socksProxyPort, ": ", e.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClientContext::ScheduleCleanupUDP()
|
|
{
|
|
if (m_CleanupUDPTimer)
|
|
{
|
|
// schedule cleanup in 17 seconds
|
|
m_CleanupUDPTimer->expires_from_now (boost::posix_time::seconds (17));
|
|
m_CleanupUDPTimer->async_wait(std::bind(&ClientContext::CleanupUDP, this, std::placeholders::_1));
|
|
}
|
|
}
|
|
|
|
void ClientContext::CleanupUDP(const boost::system::error_code & ecode)
|
|
{
|
|
if(!ecode)
|
|
{
|
|
std::lock_guard<std::mutex> lock(m_ForwardsMutex);
|
|
for (auto & s : m_ServerForwards ) s.second->ExpireStale();
|
|
ScheduleCleanupUDP();
|
|
}
|
|
}
|
|
|
|
void ClientContext::VisitTunnels (bool clean)
|
|
{
|
|
for (auto it = m_ClientTunnels.begin (); it != m_ClientTunnels.end ();)
|
|
{
|
|
if(clean && !it->second->isUpdated) {
|
|
it->second->Stop ();
|
|
it = m_ClientTunnels.erase(it);
|
|
} else {
|
|
it->second->isUpdated = false;
|
|
it++;
|
|
}
|
|
}
|
|
|
|
for (auto it = m_ServerTunnels.begin (); it != m_ServerTunnels.end ();)
|
|
{
|
|
if(clean && !it->second->isUpdated) {
|
|
it->second->Stop ();
|
|
it = m_ServerTunnels.erase(it);
|
|
} else {
|
|
it->second->isUpdated = false;
|
|
it++;
|
|
}
|
|
}
|
|
|
|
// TODO: Write correct UDP tunnels stop
|
|
for (auto it = m_ClientForwards.begin (); it != m_ClientForwards.end ();)
|
|
{
|
|
if(clean && !it->second->isUpdated) {
|
|
it->second->Stop ();
|
|
it = m_ClientForwards.erase(it);
|
|
} else {
|
|
it->second->isUpdated = false;
|
|
it++;
|
|
}
|
|
}
|
|
|
|
for (auto it = m_ServerForwards.begin (); it != m_ServerForwards.end ();)
|
|
{
|
|
if(clean && !it->second->isUpdated) {
|
|
it->second->Stop ();
|
|
it = m_ServerForwards.erase(it);
|
|
} else {
|
|
it->second->isUpdated = false;
|
|
it++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|