net.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 The Bitcoin developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2020 The DAPS Project developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_NET_H
#define BITCOIN_NET_H
 
#include "bloom.h"
#include "compat.h"
#include "hash.h"
#include "fs.h"
#include "limitedmap.h"
#include "netaddress.h"
#include "protocol.h"
#include "random.h"
#include "streams.h"
#include "sync.h"
#include "uint256.h"
#include "utilstrencodings.h"
 
#include <atomic>
#include <deque>
#include <stdint.h>
 
#ifndef WIN32
#include <arpa/inet.h>
#endif
 
#include <boost/signals2/signal.hpp>
 
class CAddrMan;
class CBlockIndex;
class CScheduler;
class CNode;
 
namespace boost
{
class thread_group;
} // namespace boost
 
static const int PING_INTERVAL = 2 * 60;
static const int TIMEOUT_INTERVAL = 20 * 60;
static const int FEELER_INTERVAL = 120;
static const unsigned int MAX_INV_SZ = 50000;
static const unsigned int MAX_LOCATOR_SZ = 101;
static const unsigned int MAX_ADDR_TO_SEND = 1000;
static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024;
static const unsigned int MAX_SUBVERSION_LENGTH = 256;
static const bool DEFAULT_LISTEN = true;
#ifdef USE_UPNP
static const bool DEFAULT_UPNP = USE_UPNP;
#else
static const bool DEFAULT_UPNP = false;
#endif
 
static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125;
 
static const ServiceFlags REQUIRED_SERVICES = NODE_NETWORK;
 
unsigned int ReceiveFloodSize();
unsigned int SendBufferSize();
 
void AddOneShot(std::string strDest);
void AddressCurrentlyConnected(const CService& addr);
CNode* FindNode(const CNetAddr& ip);
CNode* FindNode(const CSubNet& subNet);
CNode* FindNode(const std::string& addrName);
CNode* FindNode(const CService& ip);
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant* grantOutbound = NULL, const char* strDest = NULL, bool fOneShot = false, bool fFeeler = false);
void MapPort(bool fUseUPnP);
unsigned short GetListenPort();
bool BindListenPort(const CService& bindAddr, std::string& strError, bool fWhitelisted = false);
void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler);
bool StopNode();
void SocketSendData(CNode* pnode);
 
typedef int64_t NodeId;
 
struct CombinerAll {
    typedef bool result_type;
 
    template <typename I>
    bool operator()(I first, I last) const
    {
        while (first != last) {
            if (!(*first)) return false;
            ++first;
        }
        return true;
    }
};
 
// Signals for message handling
struct CNodeSignals
{
    boost::signals2::signal<int ()> GetHeight;
    boost::signals2::signal<bool (CNode*), CombinerAll> ProcessMessages;
    boost::signals2::signal<bool (CNode*), CombinerAll> SendMessages;
    boost::signals2::signal<void (NodeId, const CNode*)> InitializeNode;
    boost::signals2::signal<void (NodeId)> FinalizeNode;
};
 
 
CNodeSignals& GetNodeSignals();
 
 
enum {
    LOCAL_NONE,   // unknown
    LOCAL_IF,     // address a local interface listens on
    LOCAL_BIND,   // address explicit bound to
    LOCAL_UPNP,   // address reported by UPnP
    LOCAL_MANUAL, // address explicitly specified (-externalip=)
 
    LOCAL_MAX
};
 
bool IsPeerAddrLocalGood(CNode* pnode);
void AdvertiseLocal(CNode* pnode);
void SetLimited(enum Network net, bool fLimited = true);
bool IsLimited(enum Network net);
bool IsLimited(const CNetAddr& addr);
bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
bool RemoveLocal(const CService& addr);
bool SeenLocal(const CService& addr);
bool IsLocal(const CService& addr);
bool GetLocal(CService& addr, const CNetAddr* paddrPeer = NULL);
bool IsReachable(enum Network net);
bool IsReachable(const CNetAddr& addr);
CAddress GetLocalAddress(const CNetAddr* paddrPeer = NULL);
bool validateMasternodeIP(const std::string& addrStr);          // valid, reachable and routable address
 
 
extern bool fDiscover;
extern bool fListen;
extern ServiceFlags nLocalServices;
extern uint64_t nLocalHostNonce;
extern CAddrMan addrman;
extern int nMaxConnections;
 
extern std::vector<CNode*> vNodes;
extern RecursiveMutex cs_vNodes;
extern std::map<CInv, CDataStream> mapRelay;
extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
extern RecursiveMutex cs_mapRelay;
extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;
 
extern std::vector<std::string> vAddedNodes;
extern RecursiveMutex cs_vAddedNodes;
 
extern NodeId nLastNodeId;
extern RecursiveMutex cs_nLastNodeId;
 
extern std::string strSubVersion;
 
struct LocalServiceInfo {
    int nScore;
    int nPort;
};
 
extern RecursiveMutex cs_mapLocalHost;
extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
 
class CNodeStats
{
public:
    NodeId nodeid;
    ServiceFlags nServices;
    int64_t nLastSend;
    int64_t nLastRecv;
    int64_t nTimeConnected;
    int64_t nTimeOffset;
    std::string addrName;
    int nVersion;
    std::string cleanSubVer;
    bool fInbound;
    int nStartingHeight;
    uint64_t nSendBytes;
    uint64_t nRecvBytes;
    bool fWhitelisted;
    double dPingTime;
    double dPingWait;
    std::string addrLocal;
    CAddress addr;
};
 
 
class CNetMessage
{
public:
    bool in_data; // parsing header (false) or data (true)
 
    CDataStream hdrbuf; // partially received header
    CMessageHeader hdr; // complete header
    unsigned int nHdrPos;
 
    CDataStream vRecv; // received message data
    unsigned int nDataPos;
 
    int64_t nTime; // time (in microseconds) of message receipt.
 
    CNetMessage(int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), vRecv(nTypeIn, nVersionIn)
    {
        hdrbuf.resize(24);
        in_data = false;
        nHdrPos = 0;
        nDataPos = 0;
        nTime = 0;
    }
 
    bool complete() const
    {
        if (!in_data)
            return false;
        return (hdr.nMessageSize == nDataPos);
    }
 
    void SetVersion(int nVersionIn)
    {
        hdrbuf.SetVersion(nVersionIn);
        vRecv.SetVersion(nVersionIn);
    }
 
    int readHeader(const char* pch, unsigned int nBytes);
    int readData(const char* pch, unsigned int nBytes);
};
 
typedef enum BanReason
{
    BanReasonUnknown          = 0,
    BanReasonNodeMisbehaving  = 1,
    BanReasonManuallyAdded    = 2
} BanReason;
 
class CBanEntry
{
public:
    static const int CURRENT_VERSION=1;
    int nVersion;
    int64_t nCreateTime;
    int64_t nBanUntil;
    uint8_t banReason;
 
    CBanEntry()
    {
        SetNull();
    }
 
    CBanEntry(int64_t nCreateTimeIn)
    {
        SetNull();
        nCreateTime = nCreateTimeIn;
    }
 
    ADD_SERIALIZE_METHODS;
    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
        READWRITE(this->nVersion);
        nVersion = this->nVersion;
        READWRITE(nCreateTime);
        READWRITE(nBanUntil);
        READWRITE(banReason);
    }
 
    void SetNull()
    {
        nVersion = CBanEntry::CURRENT_VERSION;
        nCreateTime = 0;
        nBanUntil = 0;
        banReason = BanReasonUnknown;
    }
 
    std::string banReasonToString()
    {
        switch (banReason) {
            case BanReasonNodeMisbehaving:
                return "node misbehaving";
            case BanReasonManuallyAdded:
                return "manually added";
            default:
                return "unknown";
        }
    }
};
 
typedef std::map<CSubNet, CBanEntry> banmap_t;
 
 
class CNode
{
public:
    // socket
    ServiceFlags nServices;
    ServiceFlags nServicesExpected;
    SOCKET hSocket;
    CDataStream ssSend;
    size_t nSendSize;   // total size of all vSendMsg entries
    size_t nSendOffset; // offset inside the first vSendMsg already sent
    uint64_t nSendBytes;
    std::deque<CSerializeData> vSendMsg;
    RecursiveMutex cs_vSend;
 
    RecursiveMutex cs_sendProcessing;
 
    std::deque<CInv> vRecvGetData;
    std::deque<CNetMessage> vRecvMsg;
    RecursiveMutex cs_vRecvMsg;
    uint64_t nRecvBytes;
    int nRecvVersion;
 
    int64_t nLastSend;
    int64_t nLastRecv;
    int64_t nTimeConnected;
    int64_t nTimeOffset;
    CAddress addr;
    std::string addrName;
    CService addrLocal;
    int nVersion;
    // strSubVer is whatever byte array we read from the wire. However, this field is intended
    // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
    // store the sanitized version in cleanSubVer. The original should be used when dealing with
    // the network or wire types and the cleaned string used when displayed or logged.
    std::string strSubVer, cleanSubVer;
    bool fWhitelisted; // This peer can bypass DoS banning.
    bool fFeeler;      // If true this node is being used as a short lived feeler.
    bool fOneShot;
    bool fClient;
    bool fInbound;
    bool fNetworkNode;
    bool fSuccessfullyConnected;
    std::atomic_bool fDisconnect;
    // We use fRelayTxes for two purposes -
    // a) it allows us to not relay tx invs before receiving the peer's version message
    // b) the peer may tell us in their version message that we should not relay tx invs
    //    until they have initialized their bloom filter.
    bool fRelayTxes;
    CSemaphoreGrant grantOutbound;
    RecursiveMutex cs_filter;
    CBloomFilter* pfilter;
    int nRefCount;
    NodeId id;
 
protected:
    // Denial-of-service detection/prevention
    // Key is IP address, value is banned-until-time
    static banmap_t setBanned;
    static RecursiveMutex cs_setBanned;
    static bool setBannedIsDirty;
 
    std::vector<std::string> vecRequestsFulfilled; //keep track of what client has asked for
 
    // Whitelisted ranges. Any node connecting from these is automatically
    // whitelisted (as well as those connecting to whitelisted binds).
    static std::vector<CSubNet> vWhitelistedRange;
    static RecursiveMutex cs_vWhitelistedRange;
 
    // Basic fuzz-testing
    void Fuzz(int nChance); // modifies ssSend
 
public:
    uint256 hashContinue;
    int nStartingHeight;
 
    // flood relay
    std::vector<CAddress> vAddrToSend;
    CRollingBloomFilter addrKnown;
    bool fGetAddr;
    std::set<uint256> setKnown;
    int64_t nNextAddrSend;
    int64_t nNextLocalAddrSend;
 
    // inventory based relay
    CRollingBloomFilter filterInventoryKnown;
    std::vector<CInv> vInventoryToSend;
    RecursiveMutex cs_inventory;
    std::multimap<int64_t, CInv> mapAskFor;
    std::vector<uint256> vBlockRequested;
    int64_t nNextInvSend;
 
    // Ping time measurement:
    // The pong reply we're expecting, or 0 if no pong expected.
    uint64_t nPingNonceSent;
    // Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
    int64_t nPingUsecStart;
    // Last measured round-trip time.
    int64_t nPingUsecTime;
    // Best measured round-trip time.
    int64_t nMinPingUsecTime;
    // Whether a ping is requested.
    bool fPingQueued;
 
    CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn = false);
    ~CNode();
 
private:
    // Network usage totals
    static RecursiveMutex cs_totalBytesRecv;
    static RecursiveMutex cs_totalBytesSent;
    static uint64_t nTotalBytesRecv;
    static uint64_t nTotalBytesSent;
 
    CNode(const CNode&);
    void operator=(const CNode&);
 
public:
    NodeId GetId() const
    {
        return id;
    }
 
    int GetRefCount()
    {
        assert(nRefCount >= 0);
        return nRefCount;
    }
 
    // requires LOCK(cs_vRecvMsg)
    unsigned int GetTotalRecvSize()
    {
        unsigned int total = 0;
        for (const CNetMessage& msg : vRecvMsg)
            total += msg.vRecv.size() + 24;
        return total;
    }
 
    // requires LOCK(cs_vRecvMsg)
    bool ReceiveMsgBytes(const char* pch, unsigned int nBytes);
 
    // requires LOCK(cs_vRecvMsg)
    void SetRecvVersion(int nVersionIn)
    {
        nRecvVersion = nVersionIn;
        for (CNetMessage& msg : vRecvMsg)
            msg.SetVersion(nVersionIn);
    }
 
    CNode* AddRef()
    {
        nRefCount++;
        return this;
    }
 
    void Release()
    {
        nRefCount--;
    }
 
 
    void AddAddressKnown(const CAddress& addr)
    {
        addrKnown.insert(addr.GetKey());
    }
 
    void PushAddress(const CAddress& _addr, FastRandomContext &insecure_rand)
    {
        // Known checking here is only to save space from duplicates.
        // SendMessages will filter it again for knowns that were added
        // after addresses were pushed.
        if (_addr.IsValid() && !addrKnown.contains(_addr.GetKey())) {
            if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
                vAddrToSend[insecure_rand.randrange(vAddrToSend.size())] = _addr;
            } else {
                vAddrToSend.push_back(_addr);
            }
        }
    }
 
 
    void AddInventoryKnown(const CInv& inv)
    {
        {
            LOCK(cs_inventory);
            filterInventoryKnown.insert(inv.hash);
        }
    }
 
    void PushInventory(const CInv& inv)
    {
        {
            LOCK(cs_inventory);
            if (inv.type == MSG_TX && filterInventoryKnown.contains(inv.hash))
                return;
            vInventoryToSend.push_back(inv);
        }
    }
 
    void AskFor(const CInv& inv, bool fImmediateRetry = false);
 
    // TODO: Document the postcondition of this function.  Is cs_vSend locked?
    void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend);
 
    // TODO: Document the precondition of this function.  Is cs_vSend locked?
    void AbortMessage() UNLOCK_FUNCTION(cs_vSend);
 
    // TODO: Document the precondition of this function.  Is cs_vSend locked?
    void EndMessage() UNLOCK_FUNCTION(cs_vSend);
 
    void PushVersion();
 
 
    void PushMessage(const char* pszCommand)
    {
        try {
            BeginMessage(pszCommand);
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1>
    void PushMessage(const char* pszCommand, const T1& a1)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10, typename T11>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10, const T11& a11)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10 << a11;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10, typename T11, typename T12>
    void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9, const T10& a10, const T11& a11, const T12& a12)
    {
        try {
            BeginMessage(pszCommand);
            ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9 << a10 << a11 << a12;
            EndMessage();
        } catch (...) {
            AbortMessage();
            throw;
        }
    }
 
    bool HasFulfilledRequest(std::string strRequest)
    {
        for (std::string& type : vecRequestsFulfilled) {
            if (type == strRequest) return true;
        }
        return false;
    }
 
    void ClearFulfilledRequest(std::string strRequest)
    {
        std::vector<std::string>::iterator it = vecRequestsFulfilled.begin();
        while (it != vecRequestsFulfilled.end()) {
            if ((*it) == strRequest) {
                vecRequestsFulfilled.erase(it);
                return;
            }
            ++it;
        }
    }
 
    void FulfilledRequest(std::string strRequest)
    {
        if (HasFulfilledRequest(strRequest)) return;
        vecRequestsFulfilled.push_back(strRequest);
    }
 
    bool IsSubscribed(unsigned int nChannel);
    void Subscribe(unsigned int nChannel, unsigned int nHops = 0);
    void CancelSubscribe(unsigned int nChannel);
    void CloseSocketDisconnect();
    bool DisconnectOldProtocol(int nVersionRequired, std::string strLastCommand = "");
    bool DisconnectOldVersion(std::string strSubVer, int nHeight, std::string strLastCommand = "");
 
    // Denial-of-service detection/prevention
    // The idea is to detect peers that are behaving
    // badly and disconnect/ban them, but do it in a
    // one-coding-mistake-won't-shatter-the-entire-network
    // way.
    // IMPORTANT:  There should be nothing I can give a
    // node that it will forward on that will make that
    // node's peers drop it. If there is, an attacker
    // can isolate a node and/or try to split the network.
    // Dropping a node for sending stuff that is invalid
    // now but might be valid in a later version is also
    // dangerous, because it can cause a network split
    // between nodes running old code and nodes running
    // new code.
    static void ClearBanned(); // needed for unit testing
    static bool IsBanned(CNetAddr ip);
    static bool IsBanned(CSubNet subnet);
    static void Ban(const CNetAddr &ip, const BanReason &banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
    static void Ban(const CSubNet &subNet, const BanReason &banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
    static bool Unban(const CNetAddr &ip);
    static bool Unban(const CSubNet &ip);
    static void GetBanned(banmap_t &banmap);
    static void SetBanned(const banmap_t &banmap);
    static bool BannedSetIsDirty();
    static void SetBannedSetDirty(bool dirty=true);
    static void SweepBanned();
    void copyStats(CNodeStats& stats);
 
    static bool IsWhitelistedRange(const CNetAddr& ip);
    static void AddWhitelistedRange(const CSubNet& subnet);
 
    // Network stats
    static void RecordBytesRecv(uint64_t bytes);
    static void RecordBytesSent(uint64_t bytes);
 
    static uint64_t GetTotalBytesRecv();
    static uint64_t GetTotalBytesSent();
};
 
class CExplicitNetCleanup
{
public:
    static void callCleanup();
};
 
class CTransaction;
void RelayTransaction(const CTransaction& tx);
void RelayTransaction(const CTransaction& tx, const CDataStream& ss);
void RelayTransactionLockReq(const CTransaction& tx, bool relayToAll = false);
void RelayInv(CInv& inv);
 
class CAddrDB
{
private:
    fs::path pathAddr;
 
public:
    CAddrDB();
    bool Write(const CAddrMan& addr);
    bool Read(CAddrMan& addr);
    bool Read(CAddrMan& addr, CDataStream& ssPeers);
};
 
class CBanDB
{
private:
    fs::path pathBanlist;
public:
    CBanDB();
    bool Write(const banmap_t& banSet);
    bool Read(banmap_t& banSet);
};
 
struct AddedNodeInfo {
    std::string strAddedNode;
    CService resolvedAddress;
    bool fConnected;
    bool fInbound;
};
 
std::vector<AddedNodeInfo> GetAddedNodeInfo();
 
int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds);
 
#endif // BITCOIN_NET_H