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.
11 #include <boost/array.hpp>
12 #include <boost/foreach.hpp>
14 #include <openssl/rand.h>
17 #include <arpa/inet.h>
26 class CRequestTracker;
29 extern int nBestHeight;
31 const uint16_t nSocksDefault = 9050;
32 const uint16_t nPortZero = 0;
35 inline uint64_t ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 5*1000); }
36 inline uint64_t SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 1*1000); }
38 void AddOneShot(std::string strDest);
39 bool RecvLine(SOCKET hSocket, std::string& strLine);
40 bool GetMyExternalIP(CNetAddr& ipRet);
41 void AddressCurrentlyConnected(const CService& addr);
42 CNode* FindNode(const CNetAddr& ip);
43 CNode* FindNode(const CService& ip);
44 CNode* ConnectNode(CAddress addrConnect, const char *strDest = NULL, int64_t nTimeout=0);
45 bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
47 unsigned short GetListenPort();
48 bool BindListenPort(const CService &bindAddr, std::string& strError=REF(std::string()));
49 void StartNode(void* parg);
54 LOCAL_NONE, // unknown
55 LOCAL_IF, // address a local interface listens on
56 LOCAL_BIND, // address explicit bound to
57 LOCAL_IRC, // address reported by IRC (deprecated)
58 LOCAL_HTTP, // address reported by whatismyip.com and similar
59 LOCAL_MANUAL, // address explicitly specified (-externalip=)
64 void SetLimited(enum Network net, bool fLimited = true);
65 bool IsLimited(enum Network net);
66 bool IsLimited(const CNetAddr& addr);
67 bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
68 bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
69 bool SeenLocal(const CService& addr);
70 bool IsLocal(const CService& addr);
71 bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
72 bool IsReachable(const CNetAddr &addr);
73 void SetReachable(enum Network net, bool fFlag = true);
74 CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
86 void (*fn)(void*, CDataStream&);
89 explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
105 THREAD_SOCKETHANDLER,
106 THREAD_OPENCONNECTIONS,
107 THREAD_MESSAGEHANDLER,
110 THREAD_ADDEDCONNECTIONS,
121 extern bool fDiscover;
122 extern uint64_t nLocalServices;
123 extern uint64_t nLocalHostNonce;
124 extern CAddress addrSeenByPeer;
125 extern boost::array<int, THREAD_MAX> vnThreadsRunning;
126 extern CAddrMan addrman;
128 extern std::vector<CNode*> vNodes;
129 extern CCriticalSection cs_vNodes;
130 extern std::vector<std::string> vAddedNodes;
131 extern CCriticalSection cs_vAddedNodes;
132 extern std::map<CInv, CDataStream> mapRelay;
133 extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
134 extern CCriticalSection cs_mapRelay;
135 extern std::map<CInv, int64_t> mapAlreadyAskedFor;
146 int64_t nTimeConnected;
147 std::string addrName;
149 std::string strSubVer;
151 int64_t nReleaseTime;
152 int32_t nStartingHeight;
153 int32_t nMisbehavior;
163 /** Information about a peer */
174 CCriticalSection cs_vSend;
175 CCriticalSection cs_vRecv;
178 int64_t nLastSendEmpty;
179 int64_t nTimeConnected;
180 int32_t nHeaderStart;
181 uint32_t nMessageStart;
183 std::string addrName;
186 std::string strSubVer;
191 bool fSuccessfullyConnected;
193 CSemaphoreGrant grantOutbound;
197 // Denial-of-service detection/prevention
198 // Key is IP address, value is banned-until-time
199 static std::map<CNetAddr, int64_t> setBanned;
200 static CCriticalSection cs_setBanned;
204 int64_t nReleaseTime;
205 std::map<uint256, CRequestTracker> mapRequests;
206 CCriticalSection cs_mapRequests;
207 uint256 hashContinue;
208 CBlockIndex* pindexLastGetBlocksBegin;
209 uint256 hashLastGetBlocksEnd;
210 int32_t nStartingHeight;
214 std::vector<CAddress> vAddrToSend;
215 std::set<CAddress> setAddrKnown;
217 std::set<uint256> setKnown;
218 uint256 hashCheckpointKnown; // ppcoin: known sent sync-checkpoint
220 // inventory based relay
221 mruset<CInv> setInventoryKnown;
222 std::vector<CInv> vInventoryToSend;
223 CCriticalSection cs_inventory;
224 std::multimap<int64_t, CInv> mapAskFor;
226 CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false) : vSend(SER_NETWORK, MIN_PROTO_VERSION), vRecv(SER_NETWORK, MIN_PROTO_VERSION)
234 nLastSendEmpty = GetTime();
235 nTimeConnected = GetTime();
237 nMessageStart = std::numeric_limits<uint32_t>::max();
239 addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
243 fClient = false; // set by version message
244 fInbound = fInboundIn;
245 fNetworkNode = false;
246 fSuccessfullyConnected = false;
251 pindexLastGetBlocksBegin = 0;
252 hashLastGetBlocksEnd = 0;
253 nStartingHeight = -1;
257 hashCheckpointKnown = 0;
258 setInventoryKnown.max_size((size_t)SendBufferSize() / 1000);
260 // Be shy and don't send version until we hear
261 if (hSocket != INVALID_SOCKET && !fInbound)
267 if (hSocket != INVALID_SOCKET)
269 closesocket(hSocket);
270 hSocket = INVALID_SOCKET;
276 // Network usage totals
277 static CCriticalSection cs_totalBytesRecv;
278 static CCriticalSection cs_totalBytesSent;
279 static uint64_t nTotalBytesRecv;
280 static uint64_t nTotalBytesSent;
282 void operator=(const CNode&);
288 return std::max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
291 CNode* AddRef(int64_t nTimeout=0)
294 nReleaseTime = std::max(nReleaseTime, GetTime() + nTimeout);
307 void AddAddressKnown(const CAddress& addr)
309 setAddrKnown.insert(addr);
312 void PushAddress(const CAddress& addr)
314 // Known checking here is only to save space from duplicates.
315 // SendMessages will filter it again for knowns that were added
316 // after addresses were pushed.
317 if (addr.IsValid() && !setAddrKnown.count(addr))
318 vAddrToSend.push_back(addr);
322 void AddInventoryKnown(const CInv& inv)
326 setInventoryKnown.insert(inv);
330 void PushInventory(const CInv& inv)
334 if (!setInventoryKnown.count(inv))
335 vInventoryToSend.push_back(inv);
339 void AskFor(const CInv& inv)
341 // We're using mapAskFor as a priority queue,
342 // the key is the earliest time the request can be sent
343 int64_t& nRequestTime = mapAlreadyAskedFor[inv];
345 printf("askfor %s %" PRId64 " (%s)\n", inv.ToString().c_str(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000).c_str());
347 // Make sure not to reuse time indexes to keep things in the same order
348 int64_t nNow = (GetTime() - 1) * 1000000;
349 static int64_t nLastTime;
351 nNow = std::max(nNow, nLastTime);
354 // Each retry is 2 minutes after the last
355 nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
356 mapAskFor.insert(std::make_pair(nRequestTime, inv));
361 void BeginMessage(const char* pszCommand)
363 ENTER_CRITICAL_SECTION(cs_vSend);
364 if (nHeaderStart != -1)
366 nHeaderStart = (int32_t)vSend.size();
367 vSend << CMessageHeader(pszCommand, 0);
368 nMessageStart = (uint32_t)vSend.size();
370 printf("sending: %s ", pszCommand);
375 if (nHeaderStart < 0)
377 vSend.resize(nHeaderStart);
379 nMessageStart = std::numeric_limits<uint32_t>::max();
380 LEAVE_CRITICAL_SECTION(cs_vSend);
383 printf("(aborted)\n");
388 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
390 printf("dropmessages DROPPING SEND MESSAGE\n");
395 if (nHeaderStart < 0)
399 uint32_t nSize = (uint32_t) vSend.size() - nMessageStart;
400 memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::MESSAGE_SIZE_OFFSET, &nSize, sizeof(nSize));
403 uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
404 uint32_t nChecksum = 0;
405 memcpy(&nChecksum, &hash, sizeof(nChecksum));
406 assert(nMessageStart - nHeaderStart >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
407 memcpy((char*)&vSend[nHeaderStart] + CMessageHeader::CHECKSUM_OFFSET, &nChecksum, sizeof(nChecksum));
410 printf("(%d bytes)\n", nSize);
414 nMessageStart = std::numeric_limits<uint32_t>::max();
415 LEAVE_CRITICAL_SECTION(cs_vSend);
418 void EndMessageAbortIfEmpty()
420 if (nHeaderStart < 0)
422 int nSize = (int) vSend.size() - nMessageStart;
434 void PushMessage(const char* pszCommand)
438 BeginMessage(pszCommand);
448 template<typename T1>
449 void PushMessage(const char* pszCommand, const T1& a1)
453 BeginMessage(pszCommand);
464 template<typename T1, typename T2>
465 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
469 BeginMessage(pszCommand);
480 template<typename T1, typename T2, typename T3>
481 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
485 BeginMessage(pszCommand);
486 vSend << a1 << a2 << a3;
496 template<typename T1, typename T2, typename T3, typename T4>
497 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
501 BeginMessage(pszCommand);
502 vSend << a1 << a2 << a3 << a4;
512 template<typename T1, typename T2, typename T3, typename T4, typename T5>
513 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
517 BeginMessage(pszCommand);
518 vSend << a1 << a2 << a3 << a4 << a5;
528 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
529 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
533 BeginMessage(pszCommand);
534 vSend << a1 << a2 << a3 << a4 << a5 << a6;
544 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
545 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)
549 BeginMessage(pszCommand);
550 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
560 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
561 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)
565 BeginMessage(pszCommand);
566 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
576 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
577 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)
581 BeginMessage(pszCommand);
582 vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
593 void PushRequest(const char* pszCommand,
594 void (*fn)(void*, CDataStream&), void* param1)
597 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
600 LOCK(cs_mapRequests);
601 mapRequests[hashReply] = CRequestTracker(fn, param1);
604 PushMessage(pszCommand, hashReply);
607 template<typename T1>
608 void PushRequest(const char* pszCommand, const T1& a1,
609 void (*fn)(void*, CDataStream&), void* param1)
612 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
615 LOCK(cs_mapRequests);
616 mapRequests[hashReply] = CRequestTracker(fn, param1);
619 PushMessage(pszCommand, hashReply, a1);
622 template<typename T1, typename T2>
623 void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
624 void (*fn)(void*, CDataStream&), void* param1)
627 RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
630 LOCK(cs_mapRequests);
631 mapRequests[hashReply] = CRequestTracker(fn, param1);
634 PushMessage(pszCommand, hashReply, a1, a2);
639 void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
640 bool IsSubscribed(unsigned int nChannel);
641 void Subscribe(unsigned int nChannel, unsigned int nHops=0);
642 void CancelSubscribe(unsigned int nChannel);
643 void CloseSocketDisconnect();
647 // Denial-of-service detection/prevention
648 // The idea is to detect peers that are behaving
649 // badly and disconnect/ban them, but do it in a
650 // one-coding-mistake-won't-shatter-the-entire-network
652 // IMPORTANT: There should be nothing I can give a
653 // node that it will forward on that will make that
654 // node's peers drop it. If there is, an attacker
655 // can isolate a node and/or try to split the network.
656 // Dropping a node for sending stuff that is invalid
657 // now but might be valid in a later version is also
658 // dangerous, because it can cause a network split
659 // between nodes running old code and nodes running
661 static void ClearBanned(); // needed for unit testing
662 static bool IsBanned(CNetAddr ip);
663 bool Misbehaving(int howmuch); // 1 == a little, 100 == a lot
664 void copyStats(CNodeStats &stats);
666 static void RecordBytesRecv(uint64_t bytes);
667 static void RecordBytesSent(uint64_t bytes);
669 static uint64_t GetTotalBytesRecv();
670 static uint64_t GetTotalBytesSent();
673 inline void RelayInventory(const CInv& inv)
675 // Put on lists to offer to the other nodes
678 BOOST_FOREACH(CNode* pnode, vNodes)
679 pnode->PushInventory(inv);
684 void RelayTransaction(const CTransaction& tx, const uint256& hash);
685 void RelayTransaction(const CTransaction& tx, const uint256& hash, const CDataStream& ss);