1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
9 #include <boost/array.hpp>
10 #include <boost/foreach.hpp>
11 #include <openssl/rand.h>
14 #include <arpa/inet.h>
23 class CRequestTracker;
26 extern int nBestHeight;
30 inline unsigned int ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
31 inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
33 void AddOneShot(std::string strDest);
34 bool RecvLine(SOCKET hSocket, std::string& strLine);
35 bool GetMyExternalIP(CNetAddr& ipRet);
36 void AddressCurrentlyConnected(const CService& addr);
37 CNode* FindNode(const CNetAddr& ip);
38 CNode* FindNode(const CService& ip);
39 CNode* ConnectNode(CAddress addrConnect, const char *strDest = NULL, int64 nTimeout=0);
41 unsigned short GetListenPort();
42 bool BindListenPort(const CService &bindAddr, std::string& strError=REF(std::string()));
43 void StartNode(void* parg);
48 LOCAL_NONE, // unknown
49 LOCAL_IF, // address a local interface listens on
50 LOCAL_BIND, // address explicit bound to
51 LOCAL_UPNP, // address reported by UPnP
52 LOCAL_IRC, // address reported by IRC (deprecated)
53 LOCAL_HTTP, // address reported by whatismyip.com and similar
54 LOCAL_MANUAL, // address explicitly specified (-externalip=)
59 void SetLimited(enum Network net, bool fLimited = true);
60 bool IsLimited(enum Network net);
61 bool IsLimited(const CNetAddr& addr);
62 bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
63 bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
64 bool SeenLocal(const CService& addr);
65 bool IsLocal(const CService& addr);
66 bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
67 bool IsReachable(const CNetAddr &addr);
68 void SetReachable(enum Network net, bool fFlag = true);
69 CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
81 void (*fn)(void*, CDataStream&);
84 explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
100 THREAD_SOCKETHANDLER,
101 THREAD_OPENCONNECTIONS,
102 THREAD_MESSAGEHANDLER,
106 THREAD_ADDEDCONNECTIONS,
116 extern bool fDiscover;
117 extern bool fUseUPnP;
118 extern uint64 nLocalServices;
119 extern uint64 nLocalHostNonce;
120 extern CAddress addrSeenByPeer;
121 extern boost::array<int, THREAD_MAX> vnThreadsRunning;
122 extern CAddrMan addrman;
124 extern std::vector<CNode*> vNodes;
125 extern CCriticalSection cs_vNodes;
126 extern std::map<CInv, CDataStream> mapRelay;
127 extern std::deque<std::pair<int64, CInv> > vRelayExpiration;
128 extern CCriticalSection cs_mapRelay;
129 extern std::map<CInv, int64> mapAlreadyAskedFor;
140 int64 nTimeConnected;
141 std::string addrName;
143 std::string strSubVer;
157 /** Information about a peer */
168 CCriticalSection cs_vSend;
169 CCriticalSection cs_vRecv;
172 int64 nLastSendEmpty;
173 int64 nTimeConnected;
175 unsigned int nMessageStart;
177 std::string addrName;
180 std::string strSubVer;
185 bool fSuccessfullyConnected;
187 CSemaphoreGrant grantOutbound;
191 // Denial-of-service detection/prevention
192 // Key is IP address, value is banned-until-time
193 static std::map<CNetAddr, int64> setBanned;
194 static CCriticalSection cs_setBanned;
199 std::map<uint256, CRequestTracker> mapRequests;
200 CCriticalSection cs_mapRequests;
201 uint256 hashContinue;
202 CBlockIndex* pindexLastGetBlocksBegin;
203 uint256 hashLastGetBlocksEnd;
208 std::vector<CAddress> vAddrToSend;
209 std::set<CAddress> setAddrKnown;
211 std::set<uint256> setKnown;
212 uint256 hashCheckpointKnown; // ppcoin: known sent sync-checkpoint
214 // inventory based relay
215 mruset<CInv> setInventoryKnown;
216 std::vector<CInv> vInventoryToSend;
217 CCriticalSection cs_inventory;
218 std::multimap<int64, CInv> mapAskFor;
220 CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : vSend(SER_NETWORK, MIN_PROTO_VERSION), vRecv(SER_NETWORK, MIN_PROTO_VERSION)
228 nLastSendEmpty = GetTime();
229 nTimeConnected = GetTime();
233 addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
237 fClient = false; // set by version message
238 fInbound = fInboundIn;
239 fNetworkNode = false;
240 fSuccessfullyConnected = false;
245 pindexLastGetBlocksBegin = 0;
246 hashLastGetBlocksEnd = 0;
247 nStartingHeight = -1;
251 hashCheckpointKnown = 0;
252 setInventoryKnown.max_size(SendBufferSize() / 1000);
254 // Be shy and don't send version until we hear
255 if (hSocket != INVALID_SOCKET && !fInbound)
261 if (hSocket != INVALID_SOCKET)
263 closesocket(hSocket);
264 hSocket = INVALID_SOCKET;
270 // Network usage totals
271 static CCriticalSection cs_totalBytesRecv;
272 static CCriticalSection cs_totalBytesSent;
273 static uint64_t nTotalBytesRecv;
274 static uint64_t nTotalBytesSent;
276 void operator=(const CNode&);
282 return std::max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
285 CNode* AddRef(int64 nTimeout=0)
288 nReleaseTime = std::max(nReleaseTime, GetTime() + nTimeout);
301 void AddAddressKnown(const CAddress& addr)
303 setAddrKnown.insert(addr);
306 void PushAddress(const CAddress& addr)
308 // Known checking here is only to save space from duplicates.
309 // SendMessages will filter it again for knowns that were added
310 // after addresses were pushed.
311 if (addr.IsValid() && !setAddrKnown.count(addr))
312 vAddrToSend.push_back(addr);
316 void AddInventoryKnown(const CInv& inv)
320 setInventoryKnown.insert(inv);
324 void PushInventory(const CInv& inv)
328 if (!setInventoryKnown.count(inv))
329 vInventoryToSend.push_back(inv);
333 void AskFor(const CInv& inv)
335 // We're using mapAskFor as a priority queue,
336 // the key is the earliest time the request can be sent
337 int64& nRequestTime = mapAlreadyAskedFor[inv];
339 printf("askfor %s %"PRI64d" (%s)\n", inv.ToString().c_str(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000).c_str());
341 // Make sure not to reuse time indexes to keep things in the same order
342 int64 nNow = (GetTime() - 1) * 1000000;
343 static int64 nLastTime;
345 nNow = std::max(nNow, nLastTime);
348 // Each retry is 2 minutes after the last
349 nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
350 mapAskFor.insert(std::make_pair(nRequestTime, inv));
355 void BeginMessage(const char* pszCommand)
357 ENTER_CRITICAL_SECTION(cs_vSend);
358 if (nHeaderStart != -1)
360 nHeaderStart = vSend.size();
361 vSend << CMessageHeader(pszCommand, 0);
362 nMessageStart = vSend.size();
364 printf("sending: %s ", pszCommand);
369 if (nHeaderStart < 0)
371 vSend.resize(nHeaderStart);
374 LEAVE_CRITICAL_SECTION(cs_vSend);
377 printf("(aborted)\n");
382 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
384 printf("dropmessages DROPPING SEND MESSAGE\n");
389 if (nHeaderStart < 0)
393 unsigned int nSize = vSend.size() - nMessageStart;
394 memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::MESSAGE_SIZE_OFFSET, &nSize, sizeof(nSize));
397 uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
398 unsigned int nChecksum = 0;
399 memcpy(&nChecksum, &hash, sizeof(nChecksum));
400 assert(nMessageStart - nHeaderStart >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
401 memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::CHECKSUM_OFFSET, &nChecksum, sizeof(nChecksum));
404 printf("(%d bytes)\n", nSize);
409 LEAVE_CRITICAL_SECTION(cs_vSend);
412 void EndMessageAbortIfEmpty()
414 if (nHeaderStart < 0)
416 int nSize = vSend.size() - nMessageStart;
428 void PushMessage(const char* pszCommand)
432 BeginMessage(pszCommand);
442 template<typename T1>
443 void PushMessage(const char* pszCommand, const T1& a1)
447 BeginMessage(pszCommand);
458 template<typename T1, typename T2>
459 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
463 BeginMessage(pszCommand);
474 template<typename T1, typename T2, typename T3>
475 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
479 BeginMessage(pszCommand);
480 vSend << a1 << a2 << a3;
490 template<typename T1, typename T2, typename T3, typename T4>
491 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
495 BeginMessage(pszCommand);
496 vSend << a1 << a2 << a3 << a4;
506 template<typename T1, typename T2, typename T3, typename T4, typename T5>
507 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
511 BeginMessage(pszCommand);
512 vSend << a1 << a2 << a3 << a4 << a5;
522 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
523 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
527 BeginMessage(pszCommand);
528 vSend << a1 << a2 << a3 << a4 << a5 << a6;
538 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
539 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)
543 BeginMessage(pszCommand);
544 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
554 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
555 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)
559 BeginMessage(pszCommand);
560 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
570 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
571 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)
575 BeginMessage(pszCommand);
576 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
587 void PushRequest(const char* pszCommand,
588 void (*fn)(void*, CDataStream&), void* param1)
591 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
594 LOCK(cs_mapRequests);
595 mapRequests[hashReply] = CRequestTracker(fn, param1);
598 PushMessage(pszCommand, hashReply);
601 template<typename T1>
602 void PushRequest(const char* pszCommand, const T1& a1,
603 void (*fn)(void*, CDataStream&), void* param1)
606 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
609 LOCK(cs_mapRequests);
610 mapRequests[hashReply] = CRequestTracker(fn, param1);
613 PushMessage(pszCommand, hashReply, a1);
616 template<typename T1, typename T2>
617 void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
618 void (*fn)(void*, CDataStream&), void* param1)
621 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
624 LOCK(cs_mapRequests);
625 mapRequests[hashReply] = CRequestTracker(fn, param1);
628 PushMessage(pszCommand, hashReply, a1, a2);
633 void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
634 bool IsSubscribed(unsigned int nChannel);
635 void Subscribe(unsigned int nChannel, unsigned int nHops=0);
636 void CancelSubscribe(unsigned int nChannel);
637 void CloseSocketDisconnect();
641 // Denial-of-service detection/prevention
642 // The idea is to detect peers that are behaving
643 // badly and disconnect/ban them, but do it in a
644 // one-coding-mistake-won't-shatter-the-entire-network
646 // IMPORTANT: There should be nothing I can give a
647 // node that it will forward on that will make that
648 // node's peers drop it. If there is, an attacker
649 // can isolate a node and/or try to split the network.
650 // Dropping a node for sending stuff that is invalid
651 // now but might be valid in a later version is also
652 // dangerous, because it can cause a network split
653 // between nodes running old code and nodes running
655 static void ClearBanned(); // needed for unit testing
656 static bool IsBanned(CNetAddr ip);
657 bool Misbehaving(int howmuch); // 1 == a little, 100 == a lot
658 void copyStats(CNodeStats &stats);
660 static void RecordBytesRecv(uint64_t bytes);
661 static void RecordBytesSent(uint64_t bytes);
663 static uint64_t GetTotalBytesRecv();
664 static uint64_t GetTotalBytesSent();
667 inline void RelayInventory(const CInv& inv)
669 // Put on lists to offer to the other nodes
672 BOOST_FOREACH(CNode* pnode, vNodes)
673 pnode->PushInventory(inv);
678 void RelayTransaction(const CTransaction& tx, const uint256& hash);
679 void RelayTransaction(const CTransaction& tx, const uint256& hash, const CDataStream& ss);