1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2014 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
12 #include "limitedmap.h"
20 #include "utilstrencodings.h"
26 #include <arpa/inet.h>
29 #include <boost/filesystem/path.hpp>
30 #include <boost/foreach.hpp>
31 #include <boost/signals2/signal.hpp>
42 /** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
43 static const int PING_INTERVAL = 2 * 60;
44 /** Time after which to disconnect, after waiting for a ping response (or inactivity). */
45 static const int TIMEOUT_INTERVAL = 20 * 60;
46 /** The maximum number of entries in an 'inv' protocol message */
47 static const unsigned int MAX_INV_SZ = 50000;
48 /** The maximum number of new addresses to accumulate before announcing. */
49 static const unsigned int MAX_ADDR_TO_SEND = 1000;
50 /** Maximum length of incoming protocol messages (no message over 2 MiB is currently acceptable). */
51 static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024;
52 /** -listen default */
53 static const bool DEFAULT_LISTEN = true;
56 static const bool DEFAULT_UPNP = USE_UPNP;
58 static const bool DEFAULT_UPNP = false;
60 /** The maximum number of entries in mapAskFor */
61 static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
62 /** The maximum number of entries in setAskFor (larger due to getdata latency)*/
63 static const size_t SETASKFOR_MAX_SZ = 2 * MAX_INV_SZ;
65 unsigned int ReceiveFloodSize();
66 unsigned int SendBufferSize();
68 void AddOneShot(std::string strDest);
69 void AddressCurrentlyConnected(const CService& addr);
70 CNode* FindNode(const CNetAddr& ip);
71 CNode* FindNode(const std::string& addrName);
72 CNode* FindNode(const CService& ip);
73 CNode* ConnectNode(CAddress addrConnect, const char *pszDest = NULL);
74 bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
75 void MapPort(bool fUseUPnP);
76 unsigned short GetListenPort();
77 bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
78 void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler);
80 void SocketSendData(CNode *pnode);
86 typedef bool result_type;
89 bool operator()(I first, I last) const
91 while (first != last) {
92 if (!(*first)) return false;
99 // Signals for message handling
102 boost::signals2::signal<int ()> GetHeight;
103 boost::signals2::signal<bool (CNode*), CombinerAll> ProcessMessages;
104 boost::signals2::signal<bool (CNode*, bool), CombinerAll> SendMessages;
105 boost::signals2::signal<void (NodeId, const CNode*)> InitializeNode;
106 boost::signals2::signal<void (NodeId)> FinalizeNode;
110 CNodeSignals& GetNodeSignals();
115 LOCAL_NONE, // unknown
116 LOCAL_IF, // address a local interface listens on
117 LOCAL_BIND, // address explicit bound to
118 LOCAL_UPNP, // address reported by UPnP
119 LOCAL_MANUAL, // address explicitly specified (-externalip=)
124 bool IsPeerAddrLocalGood(CNode *pnode);
125 void AdvertizeLocal(CNode *pnode);
126 void SetLimited(enum Network net, bool fLimited = true);
127 bool IsLimited(enum Network net);
128 bool IsLimited(const CNetAddr& addr);
129 bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
130 bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
131 bool SeenLocal(const CService& addr);
132 bool IsLocal(const CService& addr);
133 bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
134 bool IsReachable(enum Network net);
135 bool IsReachable(const CNetAddr &addr);
136 void SetReachable(enum Network net, bool fFlag = true);
137 CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
140 extern bool fDiscover;
142 extern uint64_t nLocalServices;
143 extern uint64_t nLocalHostNonce;
144 extern CAddrMan addrman;
145 /** Maximum number of connections to simultaneously allow (aka connection slots) */
146 extern int nMaxConnections;
148 extern std::vector<CNode*> vNodes;
149 extern CCriticalSection cs_vNodes;
150 extern std::map<CInv, CDataStream> mapRelay;
151 extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
152 extern CCriticalSection cs_mapRelay;
153 extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;
155 extern std::vector<std::string> vAddedNodes;
156 extern CCriticalSection cs_vAddedNodes;
158 extern NodeId nLastNodeId;
159 extern CCriticalSection cs_nLastNodeId;
161 struct LocalServiceInfo {
166 extern CCriticalSection cs_mapLocalHost;
167 extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
176 int64_t nTimeConnected;
178 std::string addrName;
180 std::string cleanSubVer;
188 std::string addrLocal;
196 bool in_data; // parsing header (false) or data (true)
198 CDataStream hdrbuf; // partially received header
199 CMessageHeader hdr; // complete header
200 unsigned int nHdrPos;
202 CDataStream vRecv; // received message data
203 unsigned int nDataPos;
205 int64_t nTime; // time (in microseconds) of message receipt.
207 CNetMessage(const CMessageHeader::MessageStartChars& pchMessageStartIn, int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), hdr(pchMessageStartIn), vRecv(nTypeIn, nVersionIn) {
215 bool complete() const
219 return (hdr.nMessageSize == nDataPos);
222 void SetVersion(int nVersionIn)
224 hdrbuf.SetVersion(nVersionIn);
225 vRecv.SetVersion(nVersionIn);
228 int readHeader(const char *pch, unsigned int nBytes);
229 int readData(const char *pch, unsigned int nBytes);
236 /** Information about a peer */
244 size_t nSendSize; // total size of all vSendMsg entries
245 size_t nSendOffset; // offset inside the first vSendMsg already sent
247 std::deque<CSerializeData> vSendMsg;
248 CCriticalSection cs_vSend;
250 std::deque<CInv> vRecvGetData;
251 std::deque<CNetMessage> vRecvMsg;
252 CCriticalSection cs_vRecvMsg;
258 int64_t nTimeConnected;
261 std::string addrName;
264 // strSubVer is whatever byte array we read from the wire. However, this field is intended
265 // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
266 // store the sanitized version in cleanSubVer. The original should be used when dealing with
267 // the network or wire types and the cleaned string used when displayed or logged.
268 std::string strSubVer, cleanSubVer;
269 bool fWhitelisted; // This peer can bypass DoS banning.
274 bool fSuccessfullyConnected;
276 // We use fRelayTxes for two purposes -
277 // a) it allows us to not relay tx invs before receiving the peer's version message
278 // b) the peer may tell us in its version message that we should not relay tx invs
279 // until it has initialized its bloom filter.
282 CSemaphoreGrant grantOutbound;
283 CCriticalSection cs_filter;
284 CBloomFilter* pfilter;
289 // Denial-of-service detection/prevention
290 // Key is IP address, value is banned-until-time
291 static std::map<CNetAddr, int64_t> setBanned;
292 static CCriticalSection cs_setBanned;
294 // Whitelisted ranges. Any node connecting from these is automatically
295 // whitelisted (as well as those connecting to whitelisted binds).
296 static std::vector<CSubNet> vWhitelistedRange;
297 static CCriticalSection cs_vWhitelistedRange;
299 // Basic fuzz-testing
300 void Fuzz(int nChance); // modifies ssSend
303 uint256 hashContinue;
307 std::vector<CAddress> vAddrToSend;
308 CRollingBloomFilter addrKnown;
310 std::set<uint256> setKnown;
312 // inventory based relay
313 mruset<CInv> setInventoryKnown;
314 std::vector<CInv> vInventoryToSend;
315 CCriticalSection cs_inventory;
316 std::set<uint256> setAskFor;
317 std::multimap<int64_t, CInv> mapAskFor;
319 // Ping time measurement:
320 // The pong reply we're expecting, or 0 if no pong expected.
321 uint64_t nPingNonceSent;
322 // Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
323 int64_t nPingUsecStart;
324 // Last measured round-trip time.
325 int64_t nPingUsecTime;
326 // Best measured round-trip time.
327 int64_t nMinPingUsecTime;
328 // Whether a ping is requested.
331 CNode(SOCKET hSocketIn, CAddress addrIn, std::string addrNameIn = "", bool fInboundIn=false);
335 // Network usage totals
336 static CCriticalSection cs_totalBytesRecv;
337 static CCriticalSection cs_totalBytesSent;
338 static uint64_t nTotalBytesRecv;
339 static uint64_t nTotalBytesSent;
342 void operator=(const CNode&);
346 NodeId GetId() const {
352 assert(nRefCount >= 0);
356 // requires LOCK(cs_vRecvMsg)
357 unsigned int GetTotalRecvSize()
359 unsigned int total = 0;
360 BOOST_FOREACH(const CNetMessage &msg, vRecvMsg)
361 total += msg.vRecv.size() + 24;
365 // requires LOCK(cs_vRecvMsg)
366 bool ReceiveMsgBytes(const char *pch, unsigned int nBytes);
368 // requires LOCK(cs_vRecvMsg)
369 void SetRecvVersion(int nVersionIn)
371 nRecvVersion = nVersionIn;
372 BOOST_FOREACH(CNetMessage &msg, vRecvMsg)
373 msg.SetVersion(nVersionIn);
389 void AddAddressKnown(const CAddress& addr)
391 addrKnown.insert(addr.GetKey());
394 void PushAddress(const CAddress& addr)
396 // Known checking here is only to save space from duplicates.
397 // SendMessages will filter it again for knowns that were added
398 // after addresses were pushed.
399 if (addr.IsValid() && !addrKnown.contains(addr.GetKey())) {
400 if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
401 vAddrToSend[insecure_rand() % vAddrToSend.size()] = addr;
403 vAddrToSend.push_back(addr);
409 void AddInventoryKnown(const CInv& inv)
413 setInventoryKnown.insert(inv);
417 void PushInventory(const CInv& inv)
421 if (!setInventoryKnown.count(inv))
422 vInventoryToSend.push_back(inv);
426 void AskFor(const CInv& inv);
428 // TODO: Document the postcondition of this function. Is cs_vSend locked?
429 void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend);
431 // TODO: Document the precondition of this function. Is cs_vSend locked?
432 void AbortMessage() UNLOCK_FUNCTION(cs_vSend);
434 // TODO: Document the precondition of this function. Is cs_vSend locked?
435 void EndMessage() UNLOCK_FUNCTION(cs_vSend);
440 void PushMessage(const char* pszCommand)
444 BeginMessage(pszCommand);
454 template<typename T1>
455 void PushMessage(const char* pszCommand, const T1& a1)
459 BeginMessage(pszCommand);
470 template<typename T1, typename T2>
471 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
475 BeginMessage(pszCommand);
486 template<typename T1, typename T2, typename T3>
487 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
491 BeginMessage(pszCommand);
492 ssSend << a1 << a2 << a3;
502 template<typename T1, typename T2, typename T3, typename T4>
503 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
507 BeginMessage(pszCommand);
508 ssSend << a1 << a2 << a3 << a4;
518 template<typename T1, typename T2, typename T3, typename T4, typename T5>
519 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
523 BeginMessage(pszCommand);
524 ssSend << a1 << a2 << a3 << a4 << a5;
534 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
535 void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
539 BeginMessage(pszCommand);
540 ssSend << a1 << a2 << a3 << a4 << a5 << a6;
550 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
551 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)
555 BeginMessage(pszCommand);
556 ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
566 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
567 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)
571 BeginMessage(pszCommand);
572 ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
582 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
583 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)
587 BeginMessage(pszCommand);
588 ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
598 void CloseSocketDisconnect();
600 // Denial-of-service detection/prevention
601 // The idea is to detect peers that are behaving
602 // badly and disconnect/ban them, but do it in a
603 // one-coding-mistake-won't-shatter-the-entire-network
605 // IMPORTANT: There should be nothing I can give a
606 // node that it will forward on that will make that
607 // node's peers drop it. If there is, an attacker
608 // can isolate a node and/or try to split the network.
609 // Dropping a node for sending stuff that is invalid
610 // now but might be valid in a later version is also
611 // dangerous, because it can cause a network split
612 // between nodes running old code and nodes running
614 static void ClearBanned(); // needed for unit testing
615 static bool IsBanned(CNetAddr ip);
616 static bool Ban(const CNetAddr &ip);
617 void copyStats(CNodeStats &stats);
619 static bool IsWhitelistedRange(const CNetAddr &ip);
620 static void AddWhitelistedRange(const CSubNet &subnet);
623 static void RecordBytesRecv(uint64_t bytes);
624 static void RecordBytesSent(uint64_t bytes);
626 static uint64_t GetTotalBytesRecv();
627 static uint64_t GetTotalBytesSent();
633 void RelayTransaction(const CTransaction& tx);
634 void RelayTransaction(const CTransaction& tx, const CDataStream& ss);
636 /** Access to the (IP) address database (peers.dat) */
640 boost::filesystem::path pathAddr;
643 bool Write(const CAddrMan& addr);
644 bool Read(CAddrMan& addr);
647 #endif // BITCOIN_NET_H