741 lines
21 KiB
C++
741 lines
21 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_NET_H
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#define BITCOIN_NET_H
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#include "bloom.h"
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#include "compat.h"
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#include "hash.h"
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#include "limitedmap.h"
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#include "mruset.h"
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#include "netbase.h"
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#include "protocol.h"
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#include "sync.h"
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#include "uint256.h"
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#include "util.h"
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#include <deque>
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#include <stdint.h>
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#ifndef WIN32
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#include <arpa/inet.h>
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#endif
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#include <boost/foreach.hpp>
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#include <boost/signals2/signal.hpp>
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#include <openssl/rand.h>
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class CAddrMan;
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class CBlockIndex;
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class CNode;
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namespace boost {
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class thread_group;
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} // namespace boost
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/** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
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static const int PING_INTERVAL = 2 * 60;
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/** Time after which to disconnect, after waiting for a ping response (or inactivity). */
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static const int TIMEOUT_INTERVAL = 20 * 60;
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/** The maximum number of entries in an 'inv' protocol message */
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static const unsigned int MAX_INV_SZ = 50000;
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/** -listen default */
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static const bool DEFAULT_LISTEN = true;
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/** -upnp default */
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#ifdef USE_UPNP
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static const bool DEFAULT_UPNP = USE_UPNP;
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#else
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static const bool DEFAULT_UPNP = false;
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#endif
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inline unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
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inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
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void AddOneShot(std::string strDest);
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bool RecvLine(SOCKET hSocket, std::string& strLine);
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bool GetMyExternalIP(CNetAddr& ipRet);
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void AddressCurrentlyConnected(const CService& addr);
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CNode* FindNode(const CNetAddr& ip);
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CNode* FindNode(const CService& ip);
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CNode* ConnectNode(CAddress addrConnect, const char *pszDest = NULL);
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bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
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void MapPort(bool fUseUPnP);
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unsigned short GetListenPort();
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bool BindListenPort(const CService &bindAddr, std::string& strError);
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void StartNode(boost::thread_group& threadGroup);
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bool StopNode();
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void SocketSendData(CNode *pnode);
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typedef int NodeId;
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// Signals for message handling
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struct CNodeSignals
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{
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boost::signals2::signal<int ()> GetHeight;
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boost::signals2::signal<bool (CNode*)> ProcessMessages;
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boost::signals2::signal<bool (CNode*, bool)> SendMessages;
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boost::signals2::signal<void (NodeId, const CNode*)> InitializeNode;
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boost::signals2::signal<void (NodeId)> FinalizeNode;
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};
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CNodeSignals& GetNodeSignals();
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enum
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{
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LOCAL_NONE, // unknown
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LOCAL_IF, // address a local interface listens on
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LOCAL_BIND, // address explicit bound to
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LOCAL_UPNP, // address reported by UPnP
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LOCAL_HTTP, // address reported by whatismyip.com and similar
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LOCAL_MANUAL, // address explicitly specified (-externalip=)
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LOCAL_MAX
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};
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void SetLimited(enum Network net, bool fLimited = true);
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bool IsLimited(enum Network net);
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bool IsLimited(const CNetAddr& addr);
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bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
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bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
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bool SeenLocal(const CService& addr);
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bool IsLocal(const CService& addr);
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bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
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bool IsReachable(const CNetAddr &addr);
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void SetReachable(enum Network net, bool fFlag = true);
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CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
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extern bool fDiscover;
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extern bool fListen;
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extern uint64_t nLocalServices;
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extern uint64_t nLocalHostNonce;
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extern CAddrMan addrman;
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extern int nMaxConnections;
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extern std::vector<CNode*> vNodes;
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extern CCriticalSection cs_vNodes;
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extern std::map<CInv, CDataStream> mapRelay;
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extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
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extern CCriticalSection cs_mapRelay;
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extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;
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extern std::vector<std::string> vAddedNodes;
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extern CCriticalSection cs_vAddedNodes;
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extern NodeId nLastNodeId;
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extern CCriticalSection cs_nLastNodeId;
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struct LocalServiceInfo {
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int nScore;
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int nPort;
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};
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extern CCriticalSection cs_mapLocalHost;
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extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
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class CNodeStats
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{
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public:
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NodeId nodeid;
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uint64_t nServices;
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int64_t nLastSend;
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int64_t nLastRecv;
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int64_t nTimeConnected;
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std::string addrName;
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int nVersion;
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std::string cleanSubVer;
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bool fInbound;
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int nStartingHeight;
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uint64_t nSendBytes;
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uint64_t nRecvBytes;
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bool fSyncNode;
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double dPingTime;
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double dPingWait;
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std::string addrLocal;
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};
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class CNetMessage {
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public:
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bool in_data; // parsing header (false) or data (true)
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CDataStream hdrbuf; // partially received header
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CMessageHeader hdr; // complete header
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unsigned int nHdrPos;
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CDataStream vRecv; // received message data
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unsigned int nDataPos;
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CNetMessage(int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), vRecv(nTypeIn, nVersionIn) {
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hdrbuf.resize(24);
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in_data = false;
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nHdrPos = 0;
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nDataPos = 0;
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}
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bool complete() const
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{
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if (!in_data)
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return false;
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return (hdr.nMessageSize == nDataPos);
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}
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void SetVersion(int nVersionIn)
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{
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hdrbuf.SetVersion(nVersionIn);
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vRecv.SetVersion(nVersionIn);
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}
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int readHeader(const char *pch, unsigned int nBytes);
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int readData(const char *pch, unsigned int nBytes);
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};
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/** Information about a peer */
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class CNode
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{
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public:
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// socket
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uint64_t nServices;
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SOCKET hSocket;
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CDataStream ssSend;
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size_t nSendSize; // total size of all vSendMsg entries
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size_t nSendOffset; // offset inside the first vSendMsg already sent
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uint64_t nSendBytes;
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std::deque<CSerializeData> vSendMsg;
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CCriticalSection cs_vSend;
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std::deque<CInv> vRecvGetData;
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std::deque<CNetMessage> vRecvMsg;
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CCriticalSection cs_vRecvMsg;
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uint64_t nRecvBytes;
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int nRecvVersion;
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int64_t nLastSend;
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int64_t nLastRecv;
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int64_t nTimeConnected;
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CAddress addr;
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std::string addrName;
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CService addrLocal;
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int nVersion;
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// strSubVer is whatever byte array we read from the wire. However, this field is intended
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// to be printed out, displayed to humans in various forms and so on. So we sanitize it and
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// store the sanitized version in cleanSubVer. The original should be used when dealing with
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// the network or wire types and the cleaned string used when displayed or logged.
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std::string strSubVer, cleanSubVer;
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bool fOneShot;
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bool fClient;
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bool fInbound;
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bool fNetworkNode;
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bool fSuccessfullyConnected;
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bool fDisconnect;
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// We use fRelayTxes for two purposes -
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// a) it allows us to not relay tx invs before receiving the peer's version message
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// b) the peer may tell us in their version message that we should not relay tx invs
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// until they have initialized their bloom filter.
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bool fRelayTxes;
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CSemaphoreGrant grantOutbound;
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CCriticalSection cs_filter;
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CBloomFilter* pfilter;
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int nRefCount;
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NodeId id;
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protected:
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// Denial-of-service detection/prevention
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// Key is IP address, value is banned-until-time
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static std::map<CNetAddr, int64_t> setBanned;
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static CCriticalSection cs_setBanned;
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// Basic fuzz-testing
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void Fuzz(int nChance); // modifies ssSend
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public:
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uint256 hashContinue;
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CBlockIndex* pindexLastGetBlocksBegin;
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uint256 hashLastGetBlocksEnd;
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int nStartingHeight;
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bool fStartSync;
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// flood relay
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std::vector<CAddress> vAddrToSend;
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mruset<CAddress> setAddrKnown;
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bool fGetAddr;
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std::set<uint256> setKnown;
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// inventory based relay
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mruset<CInv> setInventoryKnown;
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std::vector<CInv> vInventoryToSend;
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CCriticalSection cs_inventory;
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std::multimap<int64_t, CInv> mapAskFor;
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// Ping time measurement:
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// The pong reply we're expecting, or 0 if no pong expected.
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uint64_t nPingNonceSent;
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// Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
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int64_t nPingUsecStart;
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// Last measured round-trip time.
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int64_t nPingUsecTime;
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// Whether a ping is requested.
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bool fPingQueued;
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CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : ssSend(SER_NETWORK, INIT_PROTO_VERSION), setAddrKnown(5000)
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{
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nServices = 0;
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hSocket = hSocketIn;
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nRecvVersion = INIT_PROTO_VERSION;
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nLastSend = 0;
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nLastRecv = 0;
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nSendBytes = 0;
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nRecvBytes = 0;
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nTimeConnected = GetTime();
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addr = addrIn;
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addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
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nVersion = 0;
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strSubVer = "";
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fOneShot = false;
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fClient = false; // set by version message
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fInbound = fInboundIn;
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fNetworkNode = false;
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fSuccessfullyConnected = false;
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fDisconnect = false;
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nRefCount = 0;
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nSendSize = 0;
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nSendOffset = 0;
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hashContinue = 0;
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pindexLastGetBlocksBegin = 0;
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hashLastGetBlocksEnd = 0;
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nStartingHeight = -1;
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fStartSync = false;
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fGetAddr = false;
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fRelayTxes = false;
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setInventoryKnown.max_size(SendBufferSize() / 1000);
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pfilter = new CBloomFilter();
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nPingNonceSent = 0;
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nPingUsecStart = 0;
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nPingUsecTime = 0;
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fPingQueued = false;
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{
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LOCK(cs_nLastNodeId);
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id = nLastNodeId++;
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}
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// Be shy and don't send version until we hear
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if (hSocket != INVALID_SOCKET && !fInbound)
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PushVersion();
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GetNodeSignals().InitializeNode(GetId(), this);
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}
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~CNode()
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{
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if (hSocket != INVALID_SOCKET)
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{
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closesocket(hSocket);
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hSocket = INVALID_SOCKET;
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}
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if (pfilter)
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delete pfilter;
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GetNodeSignals().FinalizeNode(GetId());
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}
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private:
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// Network usage totals
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static CCriticalSection cs_totalBytesRecv;
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static CCriticalSection cs_totalBytesSent;
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static uint64_t nTotalBytesRecv;
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static uint64_t nTotalBytesSent;
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CNode(const CNode&);
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void operator=(const CNode&);
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public:
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NodeId GetId() const {
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return id;
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}
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int GetRefCount()
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{
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assert(nRefCount >= 0);
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return nRefCount;
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}
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// requires LOCK(cs_vRecvMsg)
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unsigned int GetTotalRecvSize()
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{
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unsigned int total = 0;
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BOOST_FOREACH(const CNetMessage &msg, vRecvMsg)
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total += msg.vRecv.size() + 24;
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return total;
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}
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// requires LOCK(cs_vRecvMsg)
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bool ReceiveMsgBytes(const char *pch, unsigned int nBytes);
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// requires LOCK(cs_vRecvMsg)
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void SetRecvVersion(int nVersionIn)
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{
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nRecvVersion = nVersionIn;
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BOOST_FOREACH(CNetMessage &msg, vRecvMsg)
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msg.SetVersion(nVersionIn);
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}
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CNode* AddRef()
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{
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nRefCount++;
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return this;
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}
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void Release()
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{
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nRefCount--;
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}
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void AddAddressKnown(const CAddress& addr)
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{
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setAddrKnown.insert(addr);
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}
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void PushAddress(const CAddress& addr)
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{
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// Known checking here is only to save space from duplicates.
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// SendMessages will filter it again for knowns that were added
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// after addresses were pushed.
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if (addr.IsValid() && !setAddrKnown.count(addr))
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vAddrToSend.push_back(addr);
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}
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void AddInventoryKnown(const CInv& inv)
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{
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{
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LOCK(cs_inventory);
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setInventoryKnown.insert(inv);
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}
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}
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void PushInventory(const CInv& inv)
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{
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{
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LOCK(cs_inventory);
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if (!setInventoryKnown.count(inv))
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vInventoryToSend.push_back(inv);
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}
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}
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void AskFor(const CInv& inv)
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{
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// We're using mapAskFor as a priority queue,
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// the key is the earliest time the request can be sent
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int64_t nRequestTime;
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limitedmap<CInv, int64_t>::const_iterator it = mapAlreadyAskedFor.find(inv);
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if (it != mapAlreadyAskedFor.end())
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nRequestTime = it->second;
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else
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nRequestTime = 0;
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LogPrint("net", "askfor %s %d (%s)\n", inv.ToString(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000).c_str());
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// Make sure not to reuse time indexes to keep things in the same order
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int64_t nNow = GetTimeMicros() - 1000000;
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static int64_t nLastTime;
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++nLastTime;
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nNow = std::max(nNow, nLastTime);
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nLastTime = nNow;
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// Each retry is 2 minutes after the last
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nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
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if (it != mapAlreadyAskedFor.end())
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mapAlreadyAskedFor.update(it, nRequestTime);
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else
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mapAlreadyAskedFor.insert(std::make_pair(inv, nRequestTime));
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mapAskFor.insert(std::make_pair(nRequestTime, inv));
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}
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// TODO: Document the postcondition of this function. Is cs_vSend locked?
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void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend)
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{
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ENTER_CRITICAL_SECTION(cs_vSend);
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assert(ssSend.size() == 0);
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ssSend << CMessageHeader(pszCommand, 0);
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LogPrint("net", "sending: %s ", pszCommand);
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}
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// TODO: Document the precondition of this function. Is cs_vSend locked?
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void AbortMessage() UNLOCK_FUNCTION(cs_vSend)
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{
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ssSend.clear();
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LEAVE_CRITICAL_SECTION(cs_vSend);
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LogPrint("net", "(aborted)\n");
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}
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// TODO: Document the precondition of this function. Is cs_vSend locked?
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void EndMessage() UNLOCK_FUNCTION(cs_vSend)
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{
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// The -*messagestest options are intentionally not documented in the help message,
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// since they are only used during development to debug the networking code and are
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// not intended for end-users.
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if (mapArgs.count("-dropmessagestest") && GetRand(GetArg("-dropmessagestest", 2)) == 0)
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{
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LogPrint("net", "dropmessages DROPPING SEND MESSAGE\n");
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AbortMessage();
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return;
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}
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if (mapArgs.count("-fuzzmessagestest"))
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Fuzz(GetArg("-fuzzmessagestest", 10));
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if (ssSend.size() == 0)
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return;
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// Set the size
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unsigned int nSize = ssSend.size() - CMessageHeader::HEADER_SIZE;
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memcpy((char*)&ssSend[CMessageHeader::MESSAGE_SIZE_OFFSET], &nSize, sizeof(nSize));
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// Set the checksum
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uint256 hash = Hash(ssSend.begin() + CMessageHeader::HEADER_SIZE, ssSend.end());
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unsigned int nChecksum = 0;
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memcpy(&nChecksum, &hash, sizeof(nChecksum));
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assert(ssSend.size () >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
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memcpy((char*)&ssSend[CMessageHeader::CHECKSUM_OFFSET], &nChecksum, sizeof(nChecksum));
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LogPrint("net", "(%d bytes)\n", nSize);
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std::deque<CSerializeData>::iterator it = vSendMsg.insert(vSendMsg.end(), CSerializeData());
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ssSend.GetAndClear(*it);
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nSendSize += (*it).size();
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// If write queue empty, attempt "optimistic write"
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if (it == vSendMsg.begin())
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SocketSendData(this);
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LEAVE_CRITICAL_SECTION(cs_vSend);
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}
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void PushVersion();
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void PushMessage(const char* pszCommand)
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{
|
|
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;
|
|
}
|
|
}
|
|
|
|
bool IsSubscribed(unsigned int nChannel);
|
|
void Subscribe(unsigned int nChannel, unsigned int nHops=0);
|
|
void CancelSubscribe(unsigned int nChannel);
|
|
void CloseSocketDisconnect();
|
|
|
|
// 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 Ban(const CNetAddr &ip);
|
|
void copyStats(CNodeStats &stats);
|
|
|
|
// Network stats
|
|
static void RecordBytesRecv(uint64_t bytes);
|
|
static void RecordBytesSent(uint64_t bytes);
|
|
|
|
static uint64_t GetTotalBytesRecv();
|
|
static uint64_t GetTotalBytesSent();
|
|
};
|
|
|
|
|
|
|
|
class CTransaction;
|
|
void RelayTransaction(const CTransaction& tx);
|
|
void RelayTransaction(const CTransaction& tx, const CDataStream& ss);
|
|
|
|
/** Access to the (IP) address database (peers.dat) */
|
|
class CAddrDB
|
|
{
|
|
private:
|
|
boost::filesystem::path pathAddr;
|
|
public:
|
|
CAddrDB();
|
|
bool Write(const CAddrMan& addr);
|
|
bool Read(CAddrMan& addr);
|
|
};
|
|
|
|
#endif
|