// Copyright (c) 2009 Satoshi Nakamoto // Distributed under the MIT/X11 software license, see the accompanying // file license.txt or http://www.opensource.org/licenses/mit-license.php. #include "headers.h" void ThreadMessageHandler2(void* parg); void ThreadSocketHandler2(void* parg); void ThreadOpenConnections2(void* parg); bool OpenNetworkConnection(const CAddress& addrConnect); // // Global state variables // bool fClient = false; uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK); CAddress addrLocalHost(0, DEFAULT_PORT, nLocalServices); CNode* pnodeLocalHost = NULL; uint64 nLocalHostNonce = 0; array vnThreadsRunning; SOCKET hListenSocket = INVALID_SOCKET; int64 nThreadSocketHandlerHeartbeat = INT64_MAX; vector vNodes; CCriticalSection cs_vNodes; map, CAddress> mapAddresses; CCriticalSection cs_mapAddresses; map mapRelay; deque > vRelayExpiration; CCriticalSection cs_mapRelay; map mapAlreadyAskedFor; // Settings int fUseProxy = false; CAddress addrProxy("127.0.0.1:9050"); void CNode::PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd) { // Filter out duplicate requests if (pindexBegin == pindexLastGetBlocksBegin && hashEnd == hashLastGetBlocksEnd) return; pindexLastGetBlocksBegin = pindexBegin; hashLastGetBlocksEnd = hashEnd; PushMessage("getblocks", CBlockLocator(pindexBegin), hashEnd); } bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet) { hSocketRet = INVALID_SOCKET; SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (hSocket == INVALID_SOCKET) return false; #if defined(__BSD__) || defined(__WXOSX__) int set = 1; setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int)); #endif bool fRoutable = !(addrConnect.GetByte(3) == 10 || (addrConnect.GetByte(3) == 192 && addrConnect.GetByte(2) == 168)); bool fProxy = (fUseProxy && fRoutable); struct sockaddr_in sockaddr = (fProxy ? addrProxy.GetSockAddr() : addrConnect.GetSockAddr()); if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR) { closesocket(hSocket); return false; } if (fProxy) { printf("proxy connecting %s\n", addrConnect.ToStringLog().c_str()); char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user"; memcpy(pszSocks4IP + 2, &addrConnect.port, 2); memcpy(pszSocks4IP + 4, &addrConnect.ip, 4); char* pszSocks4 = pszSocks4IP; int nSize = sizeof(pszSocks4IP); int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL); if (ret != nSize) { closesocket(hSocket); return error("Error sending to proxy"); } char pchRet[8]; if (recv(hSocket, pchRet, 8, 0) != 8) { closesocket(hSocket); return error("Error reading proxy response"); } if (pchRet[1] != 0x5a) { closesocket(hSocket); if (pchRet[1] != 0x5b) printf("ERROR: Proxy returned error %d\n", pchRet[1]); return false; } printf("proxy connected %s\n", addrConnect.ToStringLog().c_str()); } hSocketRet = hSocket; return true; } bool GetMyExternalIP2(const CAddress& addrConnect, const char* pszGet, const char* pszKeyword, unsigned int& ipRet) { SOCKET hSocket; if (!ConnectSocket(addrConnect, hSocket)) return error("GetMyExternalIP() : connection to %s failed", addrConnect.ToString().c_str()); send(hSocket, pszGet, strlen(pszGet), MSG_NOSIGNAL); string strLine; while (RecvLine(hSocket, strLine)) { if (strLine.empty()) { loop { if (!RecvLine(hSocket, strLine)) { closesocket(hSocket); return false; } if (strLine.find(pszKeyword) != -1) { strLine = strLine.substr(strLine.find(pszKeyword) + strlen(pszKeyword)); break; } } closesocket(hSocket); if (strLine.find("<")) strLine = strLine.substr(0, strLine.find("<")); strLine = strLine.substr(strspn(strLine.c_str(), " \t\n\r")); while (strLine.size() > 0 && isspace(strLine[strLine.size()-1])) strLine.resize(strLine.size()-1); CAddress addr(strLine.c_str()); printf("GetMyExternalIP() received [%s] %s\n", strLine.c_str(), addr.ToString().c_str()); if (addr.ip == 0 || addr.ip == INADDR_NONE || !addr.IsRoutable()) return false; ipRet = addr.ip; return true; } } closesocket(hSocket); return error("GetMyExternalIP() : connection closed"); } bool GetMyExternalIP(unsigned int& ipRet) { CAddress addrConnect; const char* pszGet; const char* pszKeyword; if (fUseProxy) return false; for (int nLookup = 0; nLookup <= 1; nLookup++) for (int nHost = 1; nHost <= 2; nHost++) { if (nHost == 1) { addrConnect = CAddress("70.86.96.218:80"); // www.ipaddressworld.com if (nLookup == 1) { struct hostent* phostent = gethostbyname("www.ipaddressworld.com"); if (phostent && phostent->h_addr_list && phostent->h_addr_list[0]) addrConnect = CAddress(*(u_long*)phostent->h_addr_list[0], htons(80)); } pszGet = "GET /ip.php HTTP/1.1\r\n" "Host: www.ipaddressworld.com\r\n" "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n" "Connection: close\r\n" "\r\n"; pszKeyword = "IP:"; } else if (nHost == 2) { addrConnect = CAddress("208.78.68.70:80"); // checkip.dyndns.org if (nLookup == 1) { struct hostent* phostent = gethostbyname("checkip.dyndns.org"); if (phostent && phostent->h_addr_list && phostent->h_addr_list[0]) addrConnect = CAddress(*(u_long*)phostent->h_addr_list[0], htons(80)); } pszGet = "GET / HTTP/1.1\r\n" "Host: checkip.dyndns.org\r\n" "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n" "Connection: close\r\n" "\r\n"; pszKeyword = "Address:"; } if (GetMyExternalIP2(addrConnect, pszGet, pszKeyword, ipRet)) return true; } return false; } bool AddAddress(CAddress addr, bool fCurrentlyOnline) { if (!addr.IsRoutable()) return false; if (addr.ip == addrLocalHost.ip) return false; if (fCurrentlyOnline) addr.nTime = GetAdjustedTime(); CRITICAL_BLOCK(cs_mapAddresses) { map, CAddress>::iterator it = mapAddresses.find(addr.GetKey()); if (it == mapAddresses.end()) { // New address printf("AddAddress(%s)\n", addr.ToStringLog().c_str()); mapAddresses.insert(make_pair(addr.GetKey(), addr)); CAddrDB().WriteAddress(addr); return true; } else { bool fUpdated = false; CAddress& addrFound = (*it).second; if ((addrFound.nServices | addr.nServices) != addrFound.nServices) { // Services have been added addrFound.nServices |= addr.nServices; fUpdated = true; } int64 nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60); if (addrFound.nTime < addr.nTime - nUpdateInterval) { // Periodically update most recently seen time addrFound.nTime = addr.nTime; fUpdated = true; } if (fUpdated) CAddrDB().WriteAddress(addrFound); } } return false; } void AddressCurrentlyConnected(const CAddress& addr) { CRITICAL_BLOCK(cs_mapAddresses) { // Only if it's been published already map, CAddress>::iterator it = mapAddresses.find(addr.GetKey()); if (it != mapAddresses.end()) { CAddress& addrFound = (*it).second; int64 nUpdateInterval = 20 * 60; if (addrFound.nTime < GetAdjustedTime() - nUpdateInterval) { // Periodically update most recently seen time addrFound.nTime = GetAdjustedTime(); CAddrDB addrdb; addrdb.WriteAddress(addrFound); } } } } void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1) { // If the dialog might get closed before the reply comes back, // call this in the destructor so it doesn't get called after it's deleted. CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodes) { CRITICAL_BLOCK(pnode->cs_mapRequests) { for (map::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();) { CRequestTracker& tracker = (*mi).second; if (tracker.fn == fn && tracker.param1 == param1) pnode->mapRequests.erase(mi++); else mi++; } } } } } // // Subscription methods for the broadcast and subscription system. // Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT. // // The subscription system uses a meet-in-the-middle strategy. // With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers // subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through. // bool AnySubscribed(unsigned int nChannel) { if (pnodeLocalHost->IsSubscribed(nChannel)) return true; CRITICAL_BLOCK(cs_vNodes) foreach(CNode* pnode, vNodes) if (pnode->IsSubscribed(nChannel)) return true; return false; } bool CNode::IsSubscribed(unsigned int nChannel) { if (nChannel >= vfSubscribe.size()) return false; return vfSubscribe[nChannel]; } void CNode::Subscribe(unsigned int nChannel, unsigned int nHops) { if (nChannel >= vfSubscribe.size()) return; if (!AnySubscribed(nChannel)) { // Relay subscribe CRITICAL_BLOCK(cs_vNodes) foreach(CNode* pnode, vNodes) if (pnode != this) pnode->PushMessage("subscribe", nChannel, nHops); } vfSubscribe[nChannel] = true; } void CNode::CancelSubscribe(unsigned int nChannel) { if (nChannel >= vfSubscribe.size()) return; // Prevent from relaying cancel if wasn't subscribed if (!vfSubscribe[nChannel]) return; vfSubscribe[nChannel] = false; if (!AnySubscribed(nChannel)) { // Relay subscription cancel CRITICAL_BLOCK(cs_vNodes) foreach(CNode* pnode, vNodes) if (pnode != this) pnode->PushMessage("sub-cancel", nChannel); // Clear memory, no longer subscribed if (nChannel == MSG_PRODUCT) CRITICAL_BLOCK(cs_mapProducts) mapProducts.clear(); } } CNode* FindNode(unsigned int ip) { CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodes) if (pnode->addr.ip == ip) return (pnode); } return NULL; } CNode* FindNode(CAddress addr) { CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodes) if (pnode->addr == addr) return (pnode); } return NULL; } CNode* ConnectNode(CAddress addrConnect, int64 nTimeout) { if (addrConnect.ip == addrLocalHost.ip) return NULL; // Look for an existing connection CNode* pnode = FindNode(addrConnect.ip); if (pnode) { if (nTimeout != 0) pnode->AddRef(nTimeout); else pnode->AddRef(); return pnode; } /// debug print printf("trying connection %s lastseen=%.1fhrs lasttry=%.1fhrs\n", addrConnect.ToStringLog().c_str(), (double)(addrConnect.nTime - GetAdjustedTime())/3600.0, (double)(addrConnect.nLastTry - GetAdjustedTime())/3600.0); CRITICAL_BLOCK(cs_mapAddresses) mapAddresses[addrConnect.GetKey()].nLastTry = GetAdjustedTime(); // Connect SOCKET hSocket; if (ConnectSocket(addrConnect, hSocket)) { /// debug print printf("connected %s\n", addrConnect.ToStringLog().c_str()); // Set to nonblocking #ifdef __WXMSW__ u_long nOne = 1; if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR) printf("ConnectSocket() : ioctlsocket nonblocking setting failed, error %d\n", WSAGetLastError()); #else if (fcntl(hSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR) printf("ConnectSocket() : fcntl nonblocking setting failed, error %d\n", errno); #endif // Add node CNode* pnode = new CNode(hSocket, addrConnect, false); if (nTimeout != 0) pnode->AddRef(nTimeout); else pnode->AddRef(); CRITICAL_BLOCK(cs_vNodes) vNodes.push_back(pnode); pnode->nTimeConnected = GetTime(); return pnode; } else { return NULL; } } void CNode::CloseSocketDisconnect() { fDisconnect = true; if (hSocket != INVALID_SOCKET) { if (fDebug) printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str()); printf("disconnecting node %s\n", addr.ToStringLog().c_str()); closesocket(hSocket); hSocket = INVALID_SOCKET; } } void CNode::Cleanup() { // All of a nodes broadcasts and subscriptions are automatically torn down // when it goes down, so a node has to stay up to keep its broadcast going. CRITICAL_BLOCK(cs_mapProducts) for (map::iterator mi = mapProducts.begin(); mi != mapProducts.end();) AdvertRemoveSource(this, MSG_PRODUCT, 0, (*(mi++)).second); // Cancel subscriptions for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++) if (vfSubscribe[nChannel]) CancelSubscribe(nChannel); } void ThreadSocketHandler(void* parg) { IMPLEMENT_RANDOMIZE_STACK(ThreadSocketHandler(parg)); try { vnThreadsRunning[0]++; ThreadSocketHandler2(parg); vnThreadsRunning[0]--; } catch (std::exception& e) { vnThreadsRunning[0]--; PrintException(&e, "ThreadSocketHandler()"); } catch (...) { vnThreadsRunning[0]--; throw; // support pthread_cancel() } printf("ThreadSocketHandler exiting\n"); } void ThreadSocketHandler2(void* parg) { printf("ThreadSocketHandler started\n"); list vNodesDisconnected; int nPrevNodeCount = 0; loop { // // Disconnect nodes // CRITICAL_BLOCK(cs_vNodes) { // Disconnect unused nodes vector vNodesCopy = vNodes; foreach(CNode* pnode, vNodesCopy) { if (pnode->fDisconnect || (pnode->GetRefCount() <= 0 && pnode->vRecv.empty() && pnode->vSend.empty())) { // remove from vNodes vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end()); // close socket and cleanup pnode->CloseSocketDisconnect(); pnode->Cleanup(); // hold in disconnected pool until all refs are released pnode->nReleaseTime = max(pnode->nReleaseTime, GetTime() + 15 * 60); if (pnode->fNetworkNode || pnode->fInbound) pnode->Release(); vNodesDisconnected.push_back(pnode); } } // Delete disconnected nodes list vNodesDisconnectedCopy = vNodesDisconnected; foreach(CNode* pnode, vNodesDisconnectedCopy) { // wait until threads are done using it if (pnode->GetRefCount() <= 0) { bool fDelete = false; TRY_CRITICAL_BLOCK(pnode->cs_vSend) TRY_CRITICAL_BLOCK(pnode->cs_vRecv) TRY_CRITICAL_BLOCK(pnode->cs_mapRequests) TRY_CRITICAL_BLOCK(pnode->cs_inventory) fDelete = true; if (fDelete) { vNodesDisconnected.remove(pnode); delete pnode; } } } } if (vNodes.size() != nPrevNodeCount) { nPrevNodeCount = vNodes.size(); MainFrameRepaint(); } // // Find which sockets have data to receive // struct timeval timeout; timeout.tv_sec = 0; timeout.tv_usec = 50000; // frequency to poll pnode->vSend fd_set fdsetRecv; fd_set fdsetSend; fd_set fdsetError; FD_ZERO(&fdsetRecv); FD_ZERO(&fdsetSend); FD_ZERO(&fdsetError); SOCKET hSocketMax = 0; FD_SET(hListenSocket, &fdsetRecv); hSocketMax = max(hSocketMax, hListenSocket); CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodes) { if (pnode->hSocket == INVALID_SOCKET || pnode->hSocket < 0) continue; FD_SET(pnode->hSocket, &fdsetRecv); FD_SET(pnode->hSocket, &fdsetError); hSocketMax = max(hSocketMax, pnode->hSocket); TRY_CRITICAL_BLOCK(pnode->cs_vSend) if (!pnode->vSend.empty()) FD_SET(pnode->hSocket, &fdsetSend); } } vnThreadsRunning[0]--; int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout); vnThreadsRunning[0]++; if (fShutdown) return; if (nSelect == SOCKET_ERROR) { int nErr = WSAGetLastError(); printf("socket select error %d\n", nErr); for (int i = 0; i <= hSocketMax; i++) FD_SET(i, &fdsetRecv); FD_ZERO(&fdsetSend); FD_ZERO(&fdsetError); Sleep(timeout.tv_usec/1000); } // // Accept new connections // if (FD_ISSET(hListenSocket, &fdsetRecv)) { struct sockaddr_in sockaddr; #ifdef __WXMSW__ int len = sizeof(sockaddr); #else socklen_t len = sizeof(sockaddr); #endif SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len); CAddress addr(sockaddr); if (hSocket == INVALID_SOCKET) { if (WSAGetLastError() != WSAEWOULDBLOCK) printf("socket error accept failed: %d\n", WSAGetLastError()); } else { printf("accepted connection %s\n", addr.ToStringLog().c_str()); CNode* pnode = new CNode(hSocket, addr, true); pnode->AddRef(); CRITICAL_BLOCK(cs_vNodes) vNodes.push_back(pnode); } } // // Service each socket // vector vNodesCopy; CRITICAL_BLOCK(cs_vNodes) { vNodesCopy = vNodes; foreach(CNode* pnode, vNodesCopy) pnode->AddRef(); } foreach(CNode* pnode, vNodesCopy) { if (fShutdown) return; // // Receive // if (pnode->hSocket == INVALID_SOCKET) continue; if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError)) { TRY_CRITICAL_BLOCK(pnode->cs_vRecv) { CDataStream& vRecv = pnode->vRecv; unsigned int nPos = vRecv.size(); // typical socket buffer is 8K-64K char pchBuf[0x10000]; int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT); if (nBytes > 0) { vRecv.resize(nPos + nBytes); memcpy(&vRecv[nPos], pchBuf, nBytes); pnode->nLastRecv = GetTime(); } else if (nBytes == 0) { // socket closed gracefully if (!pnode->fDisconnect) printf("socket closed\n"); pnode->CloseSocketDisconnect(); } else if (nBytes < 0) { // error int nErr = WSAGetLastError(); if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) { if (!pnode->fDisconnect) printf("socket recv error %d\n", nErr); pnode->CloseSocketDisconnect(); } } } } // // Send // if (pnode->hSocket == INVALID_SOCKET) continue; if (FD_ISSET(pnode->hSocket, &fdsetSend)) { TRY_CRITICAL_BLOCK(pnode->cs_vSend) { CDataStream& vSend = pnode->vSend; if (!vSend.empty()) { int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT); if (nBytes > 0) { vSend.erase(vSend.begin(), vSend.begin() + nBytes); pnode->nLastSend = GetTime(); } else if (nBytes < 0) { // error int nErr = WSAGetLastError(); if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) { printf("socket send error %d\n", nErr); pnode->CloseSocketDisconnect(); } } } } } // // Inactivity checking // if (pnode->vSend.empty()) pnode->nLastSendEmpty = GetTime(); if (GetTime() - pnode->nTimeConnected > 60) { if (pnode->nLastRecv == 0 || pnode->nLastSend == 0) { printf("socket no message in first 60 seconds, %d %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0); pnode->fDisconnect = true; } else if (GetTime() - pnode->nLastSend > 90*60 && GetTime() - pnode->nLastSendEmpty > 90*60) { printf("socket not sending\n"); pnode->fDisconnect = true; } else if (GetTime() - pnode->nLastRecv > 90*60) { printf("socket inactivity timeout\n"); pnode->fDisconnect = true; } } } CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodesCopy) pnode->Release(); } nThreadSocketHandlerHeartbeat = GetTime(); Sleep(10); } } void ThreadOpenConnections(void* parg) { IMPLEMENT_RANDOMIZE_STACK(ThreadOpenConnections(parg)); try { vnThreadsRunning[1]++; ThreadOpenConnections2(parg); vnThreadsRunning[1]--; } catch (std::exception& e) { vnThreadsRunning[1]--; PrintException(&e, "ThreadOpenConnections()"); } catch (...) { vnThreadsRunning[1]--; PrintException(NULL, "ThreadOpenConnections()"); } printf("ThreadOpenConnections exiting\n"); } void ThreadOpenConnections2(void* parg) { printf("ThreadOpenConnections started\n"); // Connect to specific addresses if (mapArgs.count("-connect")) { for (int64 nLoop = 0;; nLoop++) { foreach(string strAddr, mapMultiArgs["-connect"]) { CAddress addr(strAddr, NODE_NETWORK); if (addr.IsValid()) OpenNetworkConnection(addr); for (int i = 0; i < 10 && i < nLoop; i++) { Sleep(500); if (fShutdown) return; } } } } // Connect to manually added nodes first if (mapArgs.count("-addnode")) { foreach(string strAddr, mapMultiArgs["-addnode"]) { CAddress addr(strAddr, NODE_NETWORK); if (addr.IsValid()) { OpenNetworkConnection(addr); Sleep(500); if (fShutdown) return; } } } // Initiate network connections loop { // Wait vnThreadsRunning[1]--; Sleep(500); const int nMaxConnections = 15; while (vNodes.size() >= nMaxConnections) { Sleep(2000); if (fShutdown) return; } vnThreadsRunning[1]++; if (fShutdown) return; // // Choose an address to connect to based on most recently seen // CAddress addrConnect; int64 nBest = INT64_MIN; // Do this here so we don't have to critsect vNodes inside mapAddresses critsect set setConnected; CRITICAL_BLOCK(cs_vNodes) foreach(CNode* pnode, vNodes) setConnected.insert(pnode->addr.ip); CRITICAL_BLOCK(cs_mapAddresses) { foreach(const PAIRTYPE(vector, CAddress)& item, mapAddresses) { const CAddress& addr = item.second; if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.ip)) continue; int64 nSinceLastSeen = GetAdjustedTime() - addr.nTime; int64 nSinceLastTry = GetAdjustedTime() - addr.nLastTry; // Randomize the order in a deterministic way, putting the standard port first int64 nRandomizer = (uint64)(addr.nLastTry * 9567851 + addr.ip * 7789) % (30 * 60); if (addr.port != DEFAULT_PORT) nRandomizer += 30 * 60; // Last seen Base retry frequency // <1 hour 10 min // 1 hour 1 hour // 4 hours 2 hours // 24 hours 5 hours // 48 hours 7 hours // 7 days 13 hours // 30 days 27 hours // 90 days 46 hours // 365 days 93 hours int64 nDelay = (int64)(3600.0 * sqrt(fabs(nSinceLastSeen) / 3600.0) + nRandomizer); // Fast reconnect for one hour after last seen if (nSinceLastSeen < 60 * 60) nDelay = 10 * 60; // Limit retry frequency if (nSinceLastTry < nDelay) continue; // If we have IRC, we'll be notified when they first come online, // and again every 24 hours by the refresh broadcast. if (nGotIRCAddresses > 0 && vNodes.size() >= 2 && nSinceLastSeen > 24 * 60 * 60) continue; // Only try the old stuff if we don't have enough connections if (vNodes.size() >= 2 && nSinceLastSeen > 7 * 24 * 60 * 60) continue; if (vNodes.size() >= 5 && nSinceLastSeen > 24 * 60 * 60) continue; // If multiple addresses are ready, prioritize by time since // last seen and time since last tried. int64 nScore = min(nSinceLastTry, (int64)24 * 60 * 60) - nSinceLastSeen - nRandomizer; if (nScore > nBest) { nBest = nScore; addrConnect = addr; } } } if (addrConnect.IsValid()) OpenNetworkConnection(addrConnect); } } bool OpenNetworkConnection(const CAddress& addrConnect) { // // Initiate outbound network connection // if (fShutdown) return false; if (addrConnect.ip == addrLocalHost.ip || !addrConnect.IsIPv4() || FindNode(addrConnect.ip)) return false; vnThreadsRunning[1]--; CNode* pnode = ConnectNode(addrConnect); vnThreadsRunning[1]++; if (fShutdown) return false; if (!pnode) return false; pnode->fNetworkNode = true; if (addrLocalHost.IsRoutable() && !fUseProxy) { // Advertise our address vector vAddrToSend; vAddrToSend.push_back(addrLocalHost); pnode->PushMessage("addr", vAddrToSend); } // Get as many addresses as we can pnode->PushMessage("getaddr"); pnode->fGetAddr = true; // don't relay the results of the getaddr ////// should the one on the receiving end do this too? // Subscribe our local subscription list const unsigned int nHops = 0; for (unsigned int nChannel = 0; nChannel < pnodeLocalHost->vfSubscribe.size(); nChannel++) if (pnodeLocalHost->vfSubscribe[nChannel]) pnode->PushMessage("subscribe", nChannel, nHops); return true; } void ThreadMessageHandler(void* parg) { IMPLEMENT_RANDOMIZE_STACK(ThreadMessageHandler(parg)); try { vnThreadsRunning[2]++; ThreadMessageHandler2(parg); vnThreadsRunning[2]--; } catch (std::exception& e) { vnThreadsRunning[2]--; PrintException(&e, "ThreadMessageHandler()"); } catch (...) { vnThreadsRunning[2]--; PrintException(NULL, "ThreadMessageHandler()"); } printf("ThreadMessageHandler exiting\n"); } void ThreadMessageHandler2(void* parg) { printf("ThreadMessageHandler started\n"); SetThreadPriority(THREAD_PRIORITY_BELOW_NORMAL); loop { // Poll the connected nodes for messages vector vNodesCopy; CRITICAL_BLOCK(cs_vNodes) { vNodesCopy = vNodes; foreach(CNode* pnode, vNodesCopy) pnode->AddRef(); } foreach(CNode* pnode, vNodesCopy) { // Receive messages TRY_CRITICAL_BLOCK(pnode->cs_vRecv) ProcessMessages(pnode); if (fShutdown) return; // Send messages TRY_CRITICAL_BLOCK(pnode->cs_vSend) SendMessages(pnode); if (fShutdown) return; } CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodesCopy) pnode->Release(); } // Wait and allow messages to bunch up vnThreadsRunning[2]--; Sleep(100); vnThreadsRunning[2]++; if (fShutdown) return; } } bool BindListenPort(string& strError) { strError = ""; int nOne = 1; #ifdef __WXMSW__ // Initialize Windows Sockets WSADATA wsadata; int ret = WSAStartup(MAKEWORD(2,2), &wsadata); if (ret != NO_ERROR) { strError = strprintf("Error: TCP/IP socket library failed to start (WSAStartup returned error %d)", ret); printf("%s\n", strError.c_str()); return false; } #endif // Create socket for listening for incoming connections hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (hListenSocket == INVALID_SOCKET) { strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError()); printf("%s\n", strError.c_str()); return false; } #if defined(__BSD__) || defined(__WXOSX__) // Different way of disabling SIGPIPE on BSD setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int)); #endif #ifndef __WXMSW__ // Allow binding if the port is still in TIME_WAIT state after // the program was closed and restarted. Not an issue on windows. setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int)); #endif #ifdef __WXMSW__ // Set to nonblocking, incoming connections will also inherit this if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR) #else if (fcntl(hListenSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR) #endif { strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %d)", WSAGetLastError()); printf("%s\n", strError.c_str()); return false; } // The sockaddr_in structure specifies the address family, // IP address, and port for the socket that is being bound struct sockaddr_in sockaddr; memset(&sockaddr, 0, sizeof(sockaddr)); sockaddr.sin_family = AF_INET; sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer sockaddr.sin_port = DEFAULT_PORT; if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR) { int nErr = WSAGetLastError(); if (nErr == WSAEADDRINUSE) strError = strprintf("Unable to bind to port %d on this computer. Bitcoin is probably already running.", ntohs(sockaddr.sin_port)); else strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr); printf("%s\n", strError.c_str()); return false; } printf("Bound to port %d\n", ntohs(sockaddr.sin_port)); // Listen for incoming connections if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR) { strError = strprintf("Error: Listening for incoming connections failed (listen returned error %d)", WSAGetLastError()); printf("%s\n", strError.c_str()); return false; } return true; } void StartNode(void* parg) { if (pnodeLocalHost == NULL) pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress("127.0.0.1", nLocalServices)); #ifdef __WXMSW__ // Get local host ip char pszHostName[1000] = ""; if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR) { struct hostent* phostent = gethostbyname(pszHostName); if (phostent) { // Take the first IP that isn't loopback 127.x.x.x for (int i = 0; phostent->h_addr_list[i] != NULL; i++) printf("host ip %d: %s\n", i, CAddress(*(unsigned int*)phostent->h_addr_list[i]).ToStringIP().c_str()); for (int i = 0; phostent->h_addr_list[i] != NULL; i++) { CAddress addr(*(unsigned int*)phostent->h_addr_list[i], DEFAULT_PORT, nLocalServices); if (addr.IsValid() && addr.GetByte(3) != 127) { addrLocalHost = addr; break; } } } } #else // Get local host ip struct ifaddrs* myaddrs; if (getifaddrs(&myaddrs) == 0) { for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next) { if (ifa->ifa_addr == NULL) continue; if ((ifa->ifa_flags & IFF_UP) == 0) continue; if (strcmp(ifa->ifa_name, "lo") == 0) continue; if (strcmp(ifa->ifa_name, "lo0") == 0) continue; char pszIP[100]; if (ifa->ifa_addr->sa_family == AF_INET) { struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr); if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL) printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP); // Take the first IP that isn't loopback 127.x.x.x CAddress addr(*(unsigned int*)&s4->sin_addr, DEFAULT_PORT, nLocalServices); if (addr.IsValid() && addr.GetByte(3) != 127) { addrLocalHost = addr; break; } } else if (ifa->ifa_addr->sa_family == AF_INET6) { struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr); if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL) printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP); } } freeifaddrs(myaddrs); } #endif printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str()); // Get our external IP address for incoming connections if (fUseProxy) { // Proxies can't take incoming connections addrLocalHost.ip = CAddress("0.0.0.0").ip; printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str()); } else { if (addrIncoming.IsValid()) addrLocalHost.ip = addrIncoming.ip; if (GetMyExternalIP(addrLocalHost.ip)) { addrIncoming = addrLocalHost; CWalletDB().WriteSetting("addrIncoming", addrIncoming); printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str()); } } // // Start threads // // Get addresses from IRC and advertise ours if (!CreateThread(ThreadIRCSeed, NULL)) printf("Error: CreateThread(ThreadIRCSeed) failed\n"); // Send and receive from sockets, accept connections pthread_t hThreadSocketHandler = CreateThread(ThreadSocketHandler, NULL, true); // Initiate outbound connections if (!CreateThread(ThreadOpenConnections, NULL)) printf("Error: CreateThread(ThreadOpenConnections) failed\n"); // Process messages if (!CreateThread(ThreadMessageHandler, NULL)) printf("Error: CreateThread(ThreadMessageHandler) failed\n"); // Generate coins in the background GenerateBitcoins(fGenerateBitcoins); // // Thread monitoring // Not really needed anymore, the cause of the hanging was fixed // loop { Sleep(1000); if (fShutdown) return; if (GetTime() - nThreadSocketHandlerHeartbeat > 15 * 60) { // First see if closing sockets will free it printf("*** ThreadSocketHandler is stopped ***\n"); CRITICAL_BLOCK(cs_vNodes) { foreach(CNode* pnode, vNodes) { bool fGot = false; TRY_CRITICAL_BLOCK(pnode->cs_vRecv) TRY_CRITICAL_BLOCK(pnode->cs_vSend) fGot = true; if (!fGot) { printf("*** closing socket\n"); pnode->CloseSocketDisconnect(); } } } Sleep(10000); if (fShutdown) return; if (GetTime() - nThreadSocketHandlerHeartbeat < 60) continue; // Hopefully it never comes to this. // We know it'll always be hung in the recv or send call. // cs_vRecv or cs_vSend may be left permanently unreleased, // but we always only use TRY_CRITICAL_SECTION on them. printf("*** Restarting ThreadSocketHandler ***\n"); TerminateThread(hThreadSocketHandler, 0); #ifdef __WXMSW__ CloseHandle(hThreadSocketHandler); #endif vnThreadsRunning[0] = 0; // Restart hThreadSocketHandler = CreateThread(ThreadSocketHandler, NULL, true); nThreadSocketHandlerHeartbeat = GetTime(); } } } bool StopNode() { printf("StopNode()\n"); fShutdown = true; nTransactionsUpdated++; int64 nStart = GetTime(); while (vnThreadsRunning[0] > 0 || vnThreadsRunning[2] > 0 || vnThreadsRunning[3] > 0) { if (GetTime() - nStart > 20) break; Sleep(20); } if (vnThreadsRunning[0] > 0) printf("ThreadSocketHandler still running\n"); if (vnThreadsRunning[1] > 0) printf("ThreadOpenConnections still running\n"); if (vnThreadsRunning[2] > 0) printf("ThreadMessageHandler still running\n"); if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n"); while (vnThreadsRunning[2] > 0) Sleep(20); Sleep(50); return true; } class CNetCleanup { public: CNetCleanup() { } ~CNetCleanup() { // Close sockets foreach(CNode* pnode, vNodes) if (pnode->hSocket != INVALID_SOCKET) closesocket(pnode->hSocket); if (hListenSocket != INVALID_SOCKET) if (closesocket(hListenSocket) == SOCKET_ERROR) printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError()); #ifdef __WXMSW__ // Shutdown Windows Sockets WSACleanup(); #endif } } instance_of_cnetcleanup;