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 license.txt 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>
21 class CRequestTracker;
24 extern int nBestHeight;
28 inline unsigned int ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 10*1000); }
29 inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 10*1000); }
30 static const unsigned int PUBLISH_HOPS = 5;
32 bool GetMyExternalIP(CNetAddr& ipRet);
33 bool AddAddress(CAddress addr, int64 nTimePenalty=0, CAddrDB *pAddrDB=NULL);
34 void AddressCurrentlyConnected(const CService& addr);
35 CNode* FindNode(const CNetAddr& ip);
36 CNode* FindNode(const CService& ip);
37 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
38 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
39 bool AnySubscribed(unsigned int nChannel);
40 void MapPort(bool fMapPort);
41 bool BindListenPort(std::string& strError=REF(std::string()));
42 void StartNode(void* parg);
54 void (*fn)(void*, CDataStream&);
57 explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
74 THREAD_OPENCONNECTIONS,
75 THREAD_MESSAGEHANDLER,
80 THREAD_ADDEDCONNECTIONS,
86 extern bool fAllowDNS;
87 extern uint64 nLocalServices;
88 extern CAddress addrLocalHost;
89 extern uint64 nLocalHostNonce;
90 extern boost::array<int, THREAD_MAX> vnThreadsRunning;
92 extern std::vector<CNode*> vNodes;
93 extern CCriticalSection cs_vNodes;
94 extern std::map<std::vector<unsigned char>, CAddress> mapAddresses;
95 extern CCriticalSection cs_mapAddresses;
96 extern std::map<CInv, CDataStream> mapRelay;
97 extern std::deque<std::pair<int64, CInv> > vRelayExpiration;
98 extern CCriticalSection cs_mapRelay;
99 extern std::map<CInv, int64> mapAlreadyAskedFor;
115 CCriticalSection cs_vSend;
116 CCriticalSection cs_vRecv;
119 int64 nLastSendEmpty;
120 int64 nTimeConnected;
121 unsigned int nHeaderStart;
122 unsigned int nMessageStart;
125 std::string strSubVer;
129 bool fSuccessfullyConnected;
134 // Denial-of-service detection/prevention
135 // Key is ip address, value is banned-until-time
136 static std::map<CNetAddr, int64> setBanned;
137 static CCriticalSection cs_setBanned;
142 std::map<uint256, CRequestTracker> mapRequests;
143 CCriticalSection cs_mapRequests;
144 uint256 hashContinue;
145 CBlockIndex* pindexLastGetBlocksBegin;
146 uint256 hashLastGetBlocksEnd;
150 std::vector<CAddress> vAddrToSend;
151 std::set<CAddress> setAddrKnown;
153 std::set<uint256> setKnown;
155 // inventory based relay
156 std::set<CInv> setInventoryKnown;
157 std::vector<CInv> vInventoryToSend;
158 CCriticalSection cs_inventory;
159 std::multimap<int64, CInv> mapAskFor;
161 // publish and subscription
162 std::vector<char> vfSubscribe;
164 CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
168 vSend.SetType(SER_NETWORK);
170 vRecv.SetType(SER_NETWORK);
172 // Version 0.2 obsoletes 20 Feb 2012
173 if (GetTime() > 1329696000)
175 vSend.SetVersion(209);
176 vRecv.SetVersion(209);
180 nLastSendEmpty = GetTime();
181 nTimeConnected = GetTime();
187 fClient = false; // set by version message
188 fInbound = fInboundIn;
189 fNetworkNode = false;
190 fSuccessfullyConnected = false;
195 pindexLastGetBlocksBegin = 0;
196 hashLastGetBlocksEnd = 0;
197 nStartingHeight = -1;
199 vfSubscribe.assign(256, false);
202 // Be shy and don't send version until we hear
209 if (hSocket != INVALID_SOCKET)
211 closesocket(hSocket);
212 hSocket = INVALID_SOCKET;
218 void operator=(const CNode&);
224 return std::max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
227 CNode* AddRef(int64 nTimeout=0)
230 nReleaseTime = std::max(nReleaseTime, GetTime() + nTimeout);
243 void AddAddressKnown(const CAddress& addr)
245 setAddrKnown.insert(addr);
248 void PushAddress(const CAddress& addr)
250 // Known checking here is only to save space from duplicates.
251 // SendMessages will filter it again for knowns that were added
252 // after addresses were pushed.
253 if (addr.IsValid() && !setAddrKnown.count(addr))
254 vAddrToSend.push_back(addr);
258 void AddInventoryKnown(const CInv& inv)
260 CRITICAL_BLOCK(cs_inventory)
261 setInventoryKnown.insert(inv);
264 void PushInventory(const CInv& inv)
266 CRITICAL_BLOCK(cs_inventory)
267 if (!setInventoryKnown.count(inv))
268 vInventoryToSend.push_back(inv);
271 void AskFor(const CInv& inv)
273 // We're using mapAskFor as a priority queue,
274 // the key is the earliest time the request can be sent
275 int64& nRequestTime = mapAlreadyAskedFor[inv];
276 printf("askfor %s %"PRI64d"\n", inv.ToString().c_str(), nRequestTime);
278 // Make sure not to reuse time indexes to keep things in the same order
279 int64 nNow = (GetTime() - 1) * 1000000;
280 static int64 nLastTime;
282 nNow = std::max(nNow, nLastTime);
285 // Each retry is 2 minutes after the last
286 nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
287 mapAskFor.insert(std::make_pair(nRequestTime, inv));
292 void BeginMessage(const char* pszCommand)
294 ENTER_CRITICAL_SECTION(cs_vSend);
295 if (nHeaderStart != -1)
297 nHeaderStart = vSend.size();
298 vSend << CMessageHeader(pszCommand, 0);
299 nMessageStart = vSend.size();
301 printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
302 printf("sending: %s ", pszCommand);
308 if (nHeaderStart == -1)
310 vSend.resize(nHeaderStart);
313 LEAVE_CRITICAL_SECTION(cs_vSend);
316 printf("(aborted)\n");
321 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
323 printf("dropmessages DROPPING SEND MESSAGE\n");
328 if (nHeaderStart == -1)
332 unsigned int nSize = vSend.size() - nMessageStart;
333 memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
336 if (vSend.GetVersion() >= 209)
338 uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
339 unsigned int nChecksum = 0;
340 memcpy(&nChecksum, &hash, sizeof(nChecksum));
341 assert(nMessageStart - nHeaderStart >= offsetof(CMessageHeader, nChecksum) + sizeof(nChecksum));
342 memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nChecksum), &nChecksum, sizeof(nChecksum));
346 printf("(%d bytes)\n", nSize);
351 LEAVE_CRITICAL_SECTION(cs_vSend);
354 void EndMessageAbortIfEmpty()
356 if (nHeaderStart == -1)
358 int nSize = vSend.size() - nMessageStart;
370 void PushMessage(const char* pszCommand)
374 BeginMessage(pszCommand);
384 template<typename T1>
385 void PushMessage(const char* pszCommand, const T1& a1)
389 BeginMessage(pszCommand);
400 template<typename T1, typename T2>
401 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
405 BeginMessage(pszCommand);
416 template<typename T1, typename T2, typename T3>
417 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
421 BeginMessage(pszCommand);
422 vSend << a1 << a2 << a3;
432 template<typename T1, typename T2, typename T3, typename T4>
433 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
437 BeginMessage(pszCommand);
438 vSend << a1 << a2 << a3 << a4;
448 template<typename T1, typename T2, typename T3, typename T4, typename T5>
449 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
453 BeginMessage(pszCommand);
454 vSend << a1 << a2 << a3 << a4 << a5;
464 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
465 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
469 BeginMessage(pszCommand);
470 vSend << a1 << a2 << a3 << a4 << a5 << a6;
480 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
481 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)
485 BeginMessage(pszCommand);
486 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
496 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
497 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)
501 BeginMessage(pszCommand);
502 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
512 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
513 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)
517 BeginMessage(pszCommand);
518 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
529 void PushRequest(const char* pszCommand,
530 void (*fn)(void*, CDataStream&), void* param1)
533 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
535 CRITICAL_BLOCK(cs_mapRequests)
536 mapRequests[hashReply] = CRequestTracker(fn, param1);
538 PushMessage(pszCommand, hashReply);
541 template<typename T1>
542 void PushRequest(const char* pszCommand, const T1& a1,
543 void (*fn)(void*, CDataStream&), void* param1)
546 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
548 CRITICAL_BLOCK(cs_mapRequests)
549 mapRequests[hashReply] = CRequestTracker(fn, param1);
551 PushMessage(pszCommand, hashReply, a1);
554 template<typename T1, typename T2>
555 void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
556 void (*fn)(void*, CDataStream&), void* param1)
559 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
561 CRITICAL_BLOCK(cs_mapRequests)
562 mapRequests[hashReply] = CRequestTracker(fn, param1);
564 PushMessage(pszCommand, hashReply, a1, a2);
569 void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
570 bool IsSubscribed(unsigned int nChannel);
571 void Subscribe(unsigned int nChannel, unsigned int nHops=0);
572 void CancelSubscribe(unsigned int nChannel);
573 void CloseSocketDisconnect();
577 // Denial-of-service detection/prevention
578 // The idea is to detect peers that are behaving
579 // badly and disconnect/ban them, but do it in a
580 // one-coding-mistake-won't-shatter-the-entire-network
582 // IMPORTANT: There should be nothing I can give a
583 // node that it will forward on that will make that
584 // node's peers drop it. If there is, an attacker
585 // can isolate a node and/or try to split the network.
586 // Dropping a node for sending stuff that is invalid
587 // now but might be valid in a later version is also
588 // dangerous, because it can cause a network split
589 // between nodes running old code and nodes running
591 static void ClearBanned(); // needed for unit testing
592 static bool IsBanned(CNetAddr ip);
593 bool Misbehaving(int howmuch); // 1 == a little, 100 == a lot
605 inline void RelayInventory(const CInv& inv)
607 // Put on lists to offer to the other nodes
608 CRITICAL_BLOCK(cs_vNodes)
609 BOOST_FOREACH(CNode* pnode, vNodes)
610 pnode->PushInventory(inv);
614 void RelayMessage(const CInv& inv, const T& a)
616 CDataStream ss(SER_NETWORK);
619 RelayMessage(inv, ss);
623 inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
625 CRITICAL_BLOCK(cs_mapRelay)
627 // Expire old relay messages
628 while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
630 mapRelay.erase(vRelayExpiration.front().second);
631 vRelayExpiration.pop_front();
634 // Save original serialized message so newer versions are preserved
636 vRelayExpiration.push_back(std::make_pair(GetTime() + 15 * 60, inv));
650 // Templates for the publish and subscription system.
651 // The object being published as T& obj needs to have:
652 // a set<unsigned int> setSources member
653 // specializations of AdvertInsert and AdvertErase
654 // Currently implemented for CTable and CProduct.
658 void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
661 obj.setSources.insert(pfrom->addr.ip);
663 if (!AdvertInsert(obj))
667 CRITICAL_BLOCK(cs_vNodes)
668 BOOST_FOREACH(CNode* pnode, vNodes)
669 if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
670 pnode->PushMessage("publish", nChannel, nHops, obj);
674 void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
676 uint256 hash = obj.GetHash();
678 CRITICAL_BLOCK(cs_vNodes)
679 BOOST_FOREACH(CNode* pnode, vNodes)
680 if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
681 pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
687 void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
690 obj.setSources.erase(pfrom->addr.ip);
692 // If no longer supported by any sources, cancel it
693 if (obj.setSources.empty())
694 AdvertStopPublish(pfrom, nChannel, nHops, obj);