src/net.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2011 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.
   5
   6 #include "headers.h"
   7 #include "irc.h"
   8 #include "db.h"
   9 #include "net.h"
  10 #include "init.h"
  11 #include "strlcpy.h"
  12
  13 #ifdef __WXMSW__
  14 #include <string.h>
  15 #endif
  16
  17 #ifdef USE_UPNP
  18 #include <miniupnpc/miniwget.h>
  19 #include <miniupnpc/miniupnpc.h>
  20 #include <miniupnpc/upnpcommands.h>
  21 #include <miniupnpc/upnperrors.h>
  22 #endif
  23
  24 using namespace std;
  25 using namespace boost;
  26
  27 static const int MAX_OUTBOUND_CONNECTIONS = 8;
  28
  29 void ThreadMessageHandler2(void* parg);
  30 void ThreadSocketHandler2(void* parg);
  31 void ThreadOpenConnections2(void* parg);
  32 #ifdef USE_UPNP
  33 void ThreadMapPort2(void* parg);
  34 #endif
  35 void ThreadDNSAddressSeed2(void* parg);
  36 bool OpenNetworkConnection(const CAddress& addrConnect);
  37
  38
  39
  40
  41
  42 //
  43 // Global state variables
  44 //
  45 bool fClient = false;
  46 bool fAllowDNS = false;
  47 uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
  48 CAddress addrLocalHost("0.0.0.0", 0, false, nLocalServices);
  49 static CNode* pnodeLocalHost = NULL;
  50 uint64 nLocalHostNonce = 0;
  51 array<int, 10> vnThreadsRunning;
  52 static SOCKET hListenSocket = INVALID_SOCKET;
  53
  54 vector<CNode*> vNodes;
  55 CCriticalSection cs_vNodes;
  56 map<vector<unsigned char>, CAddress> mapAddresses;
  57 CCriticalSection cs_mapAddresses;
  58 map<CInv, CDataStream> mapRelay;
  59 deque<pair<int64, CInv> > vRelayExpiration;
  60 CCriticalSection cs_mapRelay;
  61 map<CInv, int64> mapAlreadyAskedFor;
  62
  63 // Settings
  64 int fUseProxy = false;
  65 int nConnectTimeout = 5000;
  66 CAddress addrProxy("127.0.0.1",9050);
  67
  68
  69
  70
  71 unsigned short GetListenPort()
  72 {
  73     return (unsigned short)(GetArg("-port", GetDefaultPort()));
  74 }
  75
  76 void CNode::PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd)
  77 {
  78     // Filter out duplicate requests
  79     if (pindexBegin == pindexLastGetBlocksBegin && hashEnd == hashLastGetBlocksEnd)
  80         return;
  81     pindexLastGetBlocksBegin = pindexBegin;
  82     hashLastGetBlocksEnd = hashEnd;
  83
  84     PushMessage("getblocks", CBlockLocator(pindexBegin), hashEnd);
  85 }
  86
  87
  88
  89
  90
  91 bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet, int nTimeout)
  92 {
  93     hSocketRet = INVALID_SOCKET;
  94
  95     SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  96     if (hSocket == INVALID_SOCKET)
  97         return false;
  98 #ifdef SO_NOSIGPIPE
  99     int set = 1;
 100     setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
 101 #endif
 102
 103     bool fProxy = (fUseProxy && addrConnect.IsRoutable());
 104     struct sockaddr_in sockaddr = (fProxy ? addrProxy.GetSockAddr() : addrConnect.GetSockAddr());
 105
 106 #ifdef __WXMSW__
 107     u_long fNonblock = 1;
 108     if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR)
 109 #else
 110     int fFlags = fcntl(hSocket, F_GETFL, 0);
 111     if (fcntl(hSocket, F_SETFL, fFlags | O_NONBLOCK) == -1)
 112 #endif
 113     {
 114         closesocket(hSocket);
 115         return false;
 116     }
 117
 118
 119     if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
 120     {
 121         // WSAEINVAL is here because some legacy version of winsock uses it
 122         if (WSAGetLastError() == WSAEINPROGRESS || WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINVAL)
 123         {
 124             struct timeval timeout;
 125             timeout.tv_sec  = nTimeout / 1000;
 126             timeout.tv_usec = (nTimeout % 1000) * 1000;
 127
 128             fd_set fdset;
 129             FD_ZERO(&fdset);
 130             FD_SET(hSocket, &fdset);
 131             int nRet = select(hSocket + 1, NULL, &fdset, NULL, &timeout);
 132             if (nRet == 0)
 133             {
 134                 printf("connection timeout\n");
 135                 closesocket(hSocket);
 136                 return false;
 137             }
 138             if (nRet == SOCKET_ERROR)
 139             {
 140                 printf("select() for connection failed: %i\n",WSAGetLastError());
 141                 closesocket(hSocket);
 142                 return false;
 143             }
 144             socklen_t nRetSize = sizeof(nRet);
 145 #ifdef __WXMSW__
 146             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, (char*)(&nRet), &nRetSize) == SOCKET_ERROR)
 147 #else
 148             if (getsockopt(hSocket, SOL_SOCKET, SO_ERROR, &nRet, &nRetSize) == SOCKET_ERROR)
 149 #endif
 150             {
 151                 printf("getsockopt() for connection failed: %i\n",WSAGetLastError());
 152                 closesocket(hSocket);
 153                 return false;
 154             }
 155             if (nRet != 0)
 156             {
 157                 printf("connect() failed after select(): %s\n",strerror(nRet));
 158                 closesocket(hSocket);
 159                 return false;
 160             }
 161         }
 162 #ifdef __WXMSW__
 163         else if (WSAGetLastError() != WSAEISCONN)
 164 #else
 165         else
 166 #endif
 167         {
 168             printf("connect() failed: %i\n",WSAGetLastError());
 169             closesocket(hSocket);
 170             return false;
 171         }
 172     }
 173
 174     /*
 175     this isn't even strictly necessary
 176     CNode::ConnectNode immediately turns the socket back to non-blocking
 177     but we'll turn it back to blocking just in case
 178     */
 179 #ifdef __WXMSW__
 180     fNonblock = 0;
 181     if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR)
 182 #else
 183     fFlags = fcntl(hSocket, F_GETFL, 0);
 184     if (fcntl(hSocket, F_SETFL, fFlags & !O_NONBLOCK) == SOCKET_ERROR)
 185 #endif
 186     {
 187         closesocket(hSocket);
 188         return false;
 189     }
 190
 191     if (fProxy)
 192     {
 193         printf("proxy connecting %s\n", addrConnect.ToString().c_str());
 194         char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
 195         memcpy(pszSocks4IP + 2, &addrConnect.port, 2);
 196         memcpy(pszSocks4IP + 4, &addrConnect.ip, 4);
 197         char* pszSocks4 = pszSocks4IP;
 198         int nSize = sizeof(pszSocks4IP);
 199
 200         int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL);
 201         if (ret != nSize)
 202         {
 203             closesocket(hSocket);
 204             return error("Error sending to proxy");
 205         }
 206         char pchRet[8];
 207         if (recv(hSocket, pchRet, 8, 0) != 8)
 208         {
 209             closesocket(hSocket);
 210             return error("Error reading proxy response");
 211         }
 212         if (pchRet[1] != 0x5a)
 213         {
 214             closesocket(hSocket);
 215             if (pchRet[1] != 0x5b)
 216                 printf("ERROR: Proxy returned error %d\n", pchRet[1]);
 217             return false;
 218         }
 219         printf("proxy connected %s\n", addrConnect.ToString().c_str());
 220     }
 221
 222     hSocketRet = hSocket;
 223     return true;
 224 }
 225
 226 // portDefault is in host order
 227 bool Lookup(const char *pszName, vector<CAddress>& vaddr, int nServices, int nMaxSolutions, bool fAllowLookup, int portDefault, bool fAllowPort)
 228 {
 229     vaddr.clear();
 230     if (pszName[0] == 0)
 231         return false;
 232     int port = portDefault;
 233     char psz[256];
 234     char *pszHost = psz;
 235     strlcpy(psz, pszName, sizeof(psz));
 236     if (fAllowPort)
 237     {
 238         char* pszColon = strrchr(psz+1,':');
 239         char *pszPortEnd = NULL;
 240         int portParsed = pszColon ? strtoul(pszColon+1, &pszPortEnd, 10) : 0;
 241         if (pszColon && pszPortEnd && pszPortEnd[0] == 0)
 242         {
 243             if (psz[0] == '[' && pszColon[-1] == ']')
 244             {
 245                 // Future: enable IPv6 colon-notation inside []
 246                 pszHost = psz+1;
 247                 pszColon[-1] = 0;
 248             }
 249             else
 250                 pszColon[0] = 0;
 251             port = portParsed;
 252             if (port < 0 || port > USHRT_MAX)
 253                 port = USHRT_MAX;
 254         }
 255     }
 256
 257     unsigned int addrIP = inet_addr(pszHost);
 258     if (addrIP != INADDR_NONE)
 259     {
 260         // valid IP address passed
 261         vaddr.push_back(CAddress(addrIP, port, nServices));
 262         return true;
 263     }
 264
 265     if (!fAllowLookup)
 266         return false;
 267
 268     struct hostent* phostent = gethostbyname(pszHost);
 269     if (!phostent)
 270         return false;
 271
 272     if (phostent->h_addrtype != AF_INET)
 273         return false;
 274
 275     char** ppAddr = phostent->h_addr_list;
 276     while (*ppAddr != NULL && vaddr.size() != nMaxSolutions)
 277     {
 278         CAddress addr(((struct in_addr*)ppAddr[0])->s_addr, port, nServices);
 279         if (addr.IsValid())
 280             vaddr.push_back(addr);
 281         ppAddr++;
 282     }
 283
 284     return (vaddr.size() > 0);
 285 }
 286
 287 // portDefault is in host order
 288 bool Lookup(const char *pszName, CAddress& addr, int nServices, bool fAllowLookup, int portDefault, bool fAllowPort)
 289 {
 290     vector<CAddress> vaddr;
 291     bool fRet = Lookup(pszName, vaddr, nServices, 1, fAllowLookup, portDefault, fAllowPort);
 292     if (fRet)
 293         addr = vaddr[0];
 294     return fRet;
 295 }
 296
 297 bool GetMyExternalIP2(const CAddress& addrConnect, const char* pszGet, const char* pszKeyword, unsigned int& ipRet)
 298 {
 299     SOCKET hSocket;
 300     if (!ConnectSocket(addrConnect, hSocket))
 301         return error("GetMyExternalIP() : connection to %s failed", addrConnect.ToString().c_str());
 302
 303     send(hSocket, pszGet, strlen(pszGet), MSG_NOSIGNAL);
 304
 305     string strLine;
 306     while (RecvLine(hSocket, strLine))
 307     {
 308         if (strLine.empty()) // HTTP response is separated from headers by blank line
 309         {
 310             loop
 311             {
 312                 if (!RecvLine(hSocket, strLine))
 313                 {
 314                     closesocket(hSocket);
 315                     return false;
 316                 }
 317                 if (pszKeyword == NULL)
 318                     break;
 319                 if (strLine.find(pszKeyword) != -1)
 320                 {
 321                     strLine = strLine.substr(strLine.find(pszKeyword) + strlen(pszKeyword));
 322                     break;
 323                 }
 324             }
 325             closesocket(hSocket);
 326             if (strLine.find("<") != -1)
 327                 strLine = strLine.substr(0, strLine.find("<"));
 328             strLine = strLine.substr(strspn(strLine.c_str(), " \t\n\r"));
 329             while (strLine.size() > 0 && isspace(strLine[strLine.size()-1]))
 330                 strLine.resize(strLine.size()-1);
 331             CAddress addr(strLine,0,true);
 332             printf("GetMyExternalIP() received [%s] %s\n", strLine.c_str(), addr.ToString().c_str());
 333             if (addr.ip == 0 || addr.ip == INADDR_NONE || !addr.IsRoutable())
 334                 return false;
 335             ipRet = addr.ip;
 336             return true;
 337         }
 338     }
 339     closesocket(hSocket);
 340     return error("GetMyExternalIP() : connection closed");
 341 }
 342
 343 // We now get our external IP from the IRC server first and only use this as a backup
 344 bool GetMyExternalIP(unsigned int& ipRet)
 345 {
 346     CAddress addrConnect;
 347     const char* pszGet;
 348     const char* pszKeyword;
 349
 350     if (fUseProxy)
 351         return false;
 352
 353     for (int nLookup = 0; nLookup <= 1; nLookup++)
 354     for (int nHost = 1; nHost <= 2; nHost++)
 355     {
 356         // We should be phasing out our use of sites like these.  If we need
 357         // replacements, we should ask for volunteers to put this simple
 358         // php file on their webserver that prints the client IP:
 359         //  <?php echo $_SERVER["REMOTE_ADDR"]; ?>
 360         if (nHost == 1)
 361         {
 362             addrConnect = CAddress("91.198.22.70",80); // checkip.dyndns.org
 363
 364             if (nLookup == 1)
 365             {
 366                 CAddress addrIP("checkip.dyndns.org", 80, true);
 367                 if (addrIP.IsValid())
 368                     addrConnect = addrIP;
 369             }
 370
 371             pszGet = "GET / HTTP/1.1\r\n"
 372                      "Host: checkip.dyndns.org\r\n"
 373                      "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n"
 374                      "Connection: close\r\n"
 375                      "\r\n";
 376
 377             pszKeyword = "Address:";
 378         }
 379         else if (nHost == 2)
 380         {
 381             addrConnect = CAddress("74.208.43.192", 80); // www.showmyip.com
 382
 383             if (nLookup == 1)
 384             {
 385                 CAddress addrIP("www.showmyip.com", 80, true);
 386                 if (addrIP.IsValid())
 387                     addrConnect = addrIP;
 388             }
 389
 390             pszGet = "GET /simple/ HTTP/1.1\r\n"
 391                      "Host: www.showmyip.com\r\n"
 392                      "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n"
 393                      "Connection: close\r\n"
 394                      "\r\n";
 395
 396             pszKeyword = NULL; // Returns just IP address
 397         }
 398
 399         if (GetMyExternalIP2(addrConnect, pszGet, pszKeyword, ipRet))
 400             return true;
 401     }
 402
 403     return false;
 404 }
 405
 406 void ThreadGetMyExternalIP(void* parg)
 407 {
 408     // Wait for IRC to get it first
 409     if (!GetBoolArg("-noirc"))
 410     {
 411         for (int i = 0; i < 2 * 60; i++)
 412         {
 413             Sleep(1000);
 414             if (fGotExternalIP || fShutdown)
 415                 return;
 416         }
 417     }
 418
 419     // Fallback in case IRC fails to get it
 420     if (GetMyExternalIP(addrLocalHost.ip))
 421     {
 422         printf("GetMyExternalIP() returned %s\n", addrLocalHost.ToStringIP().c_str());
 423         if (addrLocalHost.IsRoutable())
 424         {
 425             // If we already connected to a few before we had our IP, go back and addr them.
 426             // setAddrKnown automatically filters any duplicate sends.
 427             CAddress addr(addrLocalHost);
 428             addr.nTime = GetAdjustedTime();
 429             CRITICAL_BLOCK(cs_vNodes)
 430                 BOOST_FOREACH(CNode* pnode, vNodes)
 431                     pnode->PushAddress(addr);
 432         }
 433     }
 434 }
 435
 436
 437
 438
 439
 440 bool AddAddress(CAddress addr, int64 nTimePenalty, CAddrDB *pAddrDB)
 441 {
 442     if (!addr.IsRoutable())
 443         return false;
 444     if (addr.ip == addrLocalHost.ip)
 445         return false;
 446     addr.nTime = max((int64)0, (int64)addr.nTime - nTimePenalty);
 447     bool fUpdated = false;
 448     bool fNew = false;
 449     CAddress addrFound = addr;
 450
 451     CRITICAL_BLOCK(cs_mapAddresses)
 452     {
 453         map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
 454         if (it == mapAddresses.end())
 455         {
 456             // New address
 457             printf("AddAddress(%s)\n", addr.ToString().c_str());
 458             mapAddresses.insert(make_pair(addr.GetKey(), addr));
 459             fUpdated = true;
 460             fNew = true;
 461         }
 462         else
 463         {
 464             addrFound = (*it).second;
 465             if ((addrFound.nServices | addr.nServices) != addrFound.nServices)
 466             {
 467                 // Services have been added
 468                 addrFound.nServices |= addr.nServices;
 469                 fUpdated = true;
 470             }
 471             bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
 472             int64 nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
 473             if (addrFound.nTime < addr.nTime - nUpdateInterval)
 474             {
 475                 // Periodically update most recently seen time
 476                 addrFound.nTime = addr.nTime;
 477                 fUpdated = true;
 478             }
 479         }
 480     }
 481     // There is a nasty deadlock bug if this is done inside the cs_mapAddresses
 482     // CRITICAL_BLOCK:
 483     // Thread 1:  begin db transaction (locks inside-db-mutex)
 484     //            then AddAddress (locks cs_mapAddresses)
 485     // Thread 2:  AddAddress (locks cs_mapAddresses)
 486     //             ... then db operation hangs waiting for inside-db-mutex
 487     if (fUpdated)
 488     {
 489         if (pAddrDB)
 490             pAddrDB->WriteAddress(addrFound);
 491         else
 492             CAddrDB().WriteAddress(addrFound);
 493     }
 494     return fNew;
 495 }
 496
 497 void AddressCurrentlyConnected(const CAddress& addr)
 498 {
 499     CRITICAL_BLOCK(cs_mapAddresses)
 500     {
 501         // Only if it's been published already
 502         map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
 503         if (it != mapAddresses.end())
 504         {
 505             CAddress& addrFound = (*it).second;
 506             int64 nUpdateInterval = 20 * 60;
 507             if (addrFound.nTime < GetAdjustedTime() - nUpdateInterval)
 508             {
 509                 // Periodically update most recently seen time
 510                 addrFound.nTime = GetAdjustedTime();
 511                 CAddrDB addrdb;
 512                 addrdb.WriteAddress(addrFound);
 513             }
 514         }
 515     }
 516 }
 517
 518
 519
 520
 521
 522 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1)
 523 {
 524     // If the dialog might get closed before the reply comes back,
 525     // call this in the destructor so it doesn't get called after it's deleted.
 526     CRITICAL_BLOCK(cs_vNodes)
 527     {
 528         BOOST_FOREACH(CNode* pnode, vNodes)
 529         {
 530             CRITICAL_BLOCK(pnode->cs_mapRequests)
 531             {
 532                 for (map<uint256, CRequestTracker>::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();)
 533                 {
 534                     CRequestTracker& tracker = (*mi).second;
 535                     if (tracker.fn == fn && tracker.param1 == param1)
 536                         pnode->mapRequests.erase(mi++);
 537                     else
 538                         mi++;
 539                 }
 540             }
 541         }
 542     }
 543 }
 544
 545
 546
 547
 548
 549
 550
 551 //
 552 // Subscription methods for the broadcast and subscription system.
 553 // Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT.
 554 //
 555 // The subscription system uses a meet-in-the-middle strategy.
 556 // With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers
 557 // subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through.
 558 //
 559
 560 bool AnySubscribed(unsigned int nChannel)
 561 {
 562     if (pnodeLocalHost->IsSubscribed(nChannel))
 563         return true;
 564     CRITICAL_BLOCK(cs_vNodes)
 565         BOOST_FOREACH(CNode* pnode, vNodes)
 566             if (pnode->IsSubscribed(nChannel))
 567                 return true;
 568     return false;
 569 }
 570
 571 bool CNode::IsSubscribed(unsigned int nChannel)
 572 {
 573     if (nChannel >= vfSubscribe.size())
 574         return false;
 575     return vfSubscribe[nChannel];
 576 }
 577
 578 void CNode::Subscribe(unsigned int nChannel, unsigned int nHops)
 579 {
 580     if (nChannel >= vfSubscribe.size())
 581         return;
 582
 583     if (!AnySubscribed(nChannel))
 584     {
 585         // Relay subscribe
 586         CRITICAL_BLOCK(cs_vNodes)
 587             BOOST_FOREACH(CNode* pnode, vNodes)
 588                 if (pnode != this)
 589                     pnode->PushMessage("subscribe", nChannel, nHops);
 590     }
 591
 592     vfSubscribe[nChannel] = true;
 593 }
 594
 595 void CNode::CancelSubscribe(unsigned int nChannel)
 596 {
 597     if (nChannel >= vfSubscribe.size())
 598         return;
 599
 600     // Prevent from relaying cancel if wasn't subscribed
 601     if (!vfSubscribe[nChannel])
 602         return;
 603     vfSubscribe[nChannel] = false;
 604
 605     if (!AnySubscribed(nChannel))
 606     {
 607         // Relay subscription cancel
 608         CRITICAL_BLOCK(cs_vNodes)
 609             BOOST_FOREACH(CNode* pnode, vNodes)
 610                 if (pnode != this)
 611                     pnode->PushMessage("sub-cancel", nChannel);
 612     }
 613 }
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623 CNode* FindNode(unsigned int ip)
 624 {
 625     CRITICAL_BLOCK(cs_vNodes)
 626     {
 627         BOOST_FOREACH(CNode* pnode, vNodes)
 628             if (pnode->addr.ip == ip)
 629                 return (pnode);
 630     }
 631     return NULL;
 632 }
 633
 634 CNode* FindNode(CAddress addr)
 635 {
 636     CRITICAL_BLOCK(cs_vNodes)
 637     {
 638         BOOST_FOREACH(CNode* pnode, vNodes)
 639             if (pnode->addr == addr)
 640                 return (pnode);
 641     }
 642     return NULL;
 643 }
 644
 645 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout)
 646 {
 647     if (addrConnect.ip == addrLocalHost.ip)
 648         return NULL;
 649
 650     // Look for an existing connection
 651     CNode* pnode = FindNode(addrConnect.ip);
 652     if (pnode)
 653     {
 654         if (nTimeout != 0)
 655             pnode->AddRef(nTimeout);
 656         else
 657             pnode->AddRef();
 658         return pnode;
 659     }
 660
 661     /// debug print
 662     printf("trying connection %s lastseen=%.1fhrs lasttry=%.1fhrs\n",
 663         addrConnect.ToString().c_str(),
 664         (double)(addrConnect.nTime - GetAdjustedTime())/3600.0,
 665         (double)(addrConnect.nLastTry - GetAdjustedTime())/3600.0);
 666
 667     CRITICAL_BLOCK(cs_mapAddresses)
 668         mapAddresses[addrConnect.GetKey()].nLastTry = GetAdjustedTime();
 669
 670     // Connect
 671     SOCKET hSocket;
 672     if (ConnectSocket(addrConnect, hSocket))
 673     {
 674         /// debug print
 675         printf("connected %s\n", addrConnect.ToString().c_str());
 676
 677         // Set to nonblocking
 678 #ifdef __WXMSW__
 679         u_long nOne = 1;
 680         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR)
 681             printf("ConnectSocket() : ioctlsocket nonblocking setting failed, error %d\n", WSAGetLastError());
 682 #else
 683         if (fcntl(hSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
 684             printf("ConnectSocket() : fcntl nonblocking setting failed, error %d\n", errno);
 685 #endif
 686
 687         // Add node
 688         CNode* pnode = new CNode(hSocket, addrConnect, false);
 689         if (nTimeout != 0)
 690             pnode->AddRef(nTimeout);
 691         else
 692             pnode->AddRef();
 693         CRITICAL_BLOCK(cs_vNodes)
 694             vNodes.push_back(pnode);
 695
 696         pnode->nTimeConnected = GetTime();
 697         return pnode;
 698     }
 699     else
 700     {
 701         return NULL;
 702     }
 703 }
 704
 705 void CNode::CloseSocketDisconnect()
 706 {
 707     fDisconnect = true;
 708     if (hSocket != INVALID_SOCKET)
 709     {
 710         if (fDebug)
 711             printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 712         printf("disconnecting node %s\n", addr.ToString().c_str());
 713         closesocket(hSocket);
 714         hSocket = INVALID_SOCKET;
 715     }
 716 }
 717
 718 void CNode::Cleanup()
 719 {
 720     // All of a nodes broadcasts and subscriptions are automatically torn down
 721     // when it goes down, so a node has to stay up to keep its broadcast going.
 722
 723     // Cancel subscriptions
 724     for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++)
 725         if (vfSubscribe[nChannel])
 726             CancelSubscribe(nChannel);
 727 }
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741 void ThreadSocketHandler(void* parg)
 742 {
 743     IMPLEMENT_RANDOMIZE_STACK(ThreadSocketHandler(parg));
 744     try
 745     {
 746         vnThreadsRunning[0]++;
 747         ThreadSocketHandler2(parg);
 748         vnThreadsRunning[0]--;
 749     }
 750     catch (std::exception& e) {
 751         vnThreadsRunning[0]--;
 752         PrintException(&e, "ThreadSocketHandler()");
 753     } catch (...) {
 754         vnThreadsRunning[0]--;
 755         throw; // support pthread_cancel()
 756     }
 757     printf("ThreadSocketHandler exiting\n");
 758 }
 759
 760 void ThreadSocketHandler2(void* parg)
 761 {
 762     printf("ThreadSocketHandler started\n");
 763     list<CNode*> vNodesDisconnected;
 764     int nPrevNodeCount = 0;
 765
 766     loop
 767     {
 768         //
 769         // Disconnect nodes
 770         //
 771         CRITICAL_BLOCK(cs_vNodes)
 772         {
 773             // Disconnect unused nodes
 774             vector<CNode*> vNodesCopy = vNodes;
 775             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 776             {
 777                 if (pnode->fDisconnect ||
 778                     (pnode->GetRefCount() <= 0 && pnode->vRecv.empty() && pnode->vSend.empty()))
 779                 {
 780                     // remove from vNodes
 781                     vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
 782
 783                     // close socket and cleanup
 784                     pnode->CloseSocketDisconnect();
 785                     pnode->Cleanup();
 786
 787                     // hold in disconnected pool until all refs are released
 788                     pnode->nReleaseTime = max(pnode->nReleaseTime, GetTime() + 15 * 60);
 789                     if (pnode->fNetworkNode || pnode->fInbound)
 790                         pnode->Release();
 791                     vNodesDisconnected.push_back(pnode);
 792                 }
 793             }
 794
 795             // Delete disconnected nodes
 796             list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
 797             BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)
 798             {
 799                 // wait until threads are done using it
 800                 if (pnode->GetRefCount() <= 0)
 801                 {
 802                     bool fDelete = false;
 803                     TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 804                      TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
 805                       TRY_CRITICAL_BLOCK(pnode->cs_mapRequests)
 806                        TRY_CRITICAL_BLOCK(pnode->cs_inventory)
 807                         fDelete = true;
 808                     if (fDelete)
 809                     {
 810                         vNodesDisconnected.remove(pnode);
 811                         delete pnode;
 812                     }
 813                 }
 814             }
 815         }
 816         if (vNodes.size() != nPrevNodeCount)
 817         {
 818             nPrevNodeCount = vNodes.size();
 819             MainFrameRepaint();
 820         }
 821
 822
 823         //
 824         // Find which sockets have data to receive
 825         //
 826         struct timeval timeout;
 827         timeout.tv_sec  = 0;
 828         timeout.tv_usec = 50000; // frequency to poll pnode->vSend
 829
 830         fd_set fdsetRecv;
 831         fd_set fdsetSend;
 832         fd_set fdsetError;
 833         FD_ZERO(&fdsetRecv);
 834         FD_ZERO(&fdsetSend);
 835         FD_ZERO(&fdsetError);
 836         SOCKET hSocketMax = 0;
 837
 838         if(hListenSocket != INVALID_SOCKET)
 839             FD_SET(hListenSocket, &fdsetRecv);
 840         hSocketMax = max(hSocketMax, hListenSocket);
 841         CRITICAL_BLOCK(cs_vNodes)
 842         {
 843             BOOST_FOREACH(CNode* pnode, vNodes)
 844             {
 845                 if (pnode->hSocket == INVALID_SOCKET)
 846                     continue;
 847                 FD_SET(pnode->hSocket, &fdsetRecv);
 848                 FD_SET(pnode->hSocket, &fdsetError);
 849                 hSocketMax = max(hSocketMax, pnode->hSocket);
 850                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 851                     if (!pnode->vSend.empty())
 852                         FD_SET(pnode->hSocket, &fdsetSend);
 853             }
 854         }
 855
 856         vnThreadsRunning[0]--;
 857         int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
 858         vnThreadsRunning[0]++;
 859         if (fShutdown)
 860             return;
 861         if (nSelect == SOCKET_ERROR)
 862         {
 863             int nErr = WSAGetLastError();
 864             if (hSocketMax > -1)
 865             {
 866                 printf("socket select error %d\n", nErr);
 867                 for (int i = 0; i <= hSocketMax; i++)
 868                     FD_SET(i, &fdsetRecv);
 869             }
 870             FD_ZERO(&fdsetSend);
 871             FD_ZERO(&fdsetError);
 872             Sleep(timeout.tv_usec/1000);
 873         }
 874
 875
 876         //
 877         // Accept new connections
 878         //
 879         if (hListenSocket != INVALID_SOCKET && FD_ISSET(hListenSocket, &fdsetRecv))
 880         {
 881             struct sockaddr_in sockaddr;
 882             socklen_t len = sizeof(sockaddr);
 883             SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
 884             CAddress addr(sockaddr);
 885             int nInbound = 0;
 886
 887             CRITICAL_BLOCK(cs_vNodes)
 888                 BOOST_FOREACH(CNode* pnode, vNodes)
 889                 if (pnode->fInbound)
 890                     nInbound++;
 891             if (hSocket == INVALID_SOCKET)
 892             {
 893                 if (WSAGetLastError() != WSAEWOULDBLOCK)
 894                     printf("socket error accept failed: %d\n", WSAGetLastError());
 895             }
 896             else if (nInbound >= GetArg("-maxconnections", 125) - MAX_OUTBOUND_CONNECTIONS)
 897             {
 898                 closesocket(hSocket);
 899             }
 900             else
 901             {
 902                 printf("accepted connection %s\n", addr.ToString().c_str());
 903                 CNode* pnode = new CNode(hSocket, addr, true);
 904                 pnode->AddRef();
 905                 CRITICAL_BLOCK(cs_vNodes)
 906                     vNodes.push_back(pnode);
 907             }
 908         }
 909
 910
 911         //
 912         // Service each socket
 913         //
 914         vector<CNode*> vNodesCopy;
 915         CRITICAL_BLOCK(cs_vNodes)
 916         {
 917             vNodesCopy = vNodes;
 918             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 919                 pnode->AddRef();
 920         }
 921         BOOST_FOREACH(CNode* pnode, vNodesCopy)
 922         {
 923             if (fShutdown)
 924                 return;
 925
 926             //
 927             // Receive
 928             //
 929             if (pnode->hSocket == INVALID_SOCKET)
 930                 continue;
 931             if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
 932             {
 933                 TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
 934                 {
 935                     CDataStream& vRecv = pnode->vRecv;
 936                     unsigned int nPos = vRecv.size();
 937
 938                     if (nPos > ReceiveBufferSize()) {
 939                         if (!pnode->fDisconnect)
 940                             printf("socket recv flood control disconnect (%d bytes)\n", vRecv.size());
 941                         pnode->CloseSocketDisconnect();
 942                     }
 943                     else {
 944                         // typical socket buffer is 8K-64K
 945                         char pchBuf[0x10000];
 946                         int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
 947                         if (nBytes > 0)
 948                         {
 949                             vRecv.resize(nPos + nBytes);
 950                             memcpy(&vRecv[nPos], pchBuf, nBytes);
 951                             pnode->nLastRecv = GetTime();
 952                         }
 953                         else if (nBytes == 0)
 954                         {
 955                             // socket closed gracefully
 956                             if (!pnode->fDisconnect)
 957                                 printf("socket closed\n");
 958                             pnode->CloseSocketDisconnect();
 959                         }
 960                         else if (nBytes < 0)
 961                         {
 962                             // error
 963                             int nErr = WSAGetLastError();
 964                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
 965                             {
 966                                 if (!pnode->fDisconnect)
 967                                     printf("socket recv error %d\n", nErr);
 968                                 pnode->CloseSocketDisconnect();
 969                             }
 970                         }
 971                     }
 972                 }
 973             }
 974
 975             //
 976             // Send
 977             //
 978             if (pnode->hSocket == INVALID_SOCKET)
 979                 continue;
 980             if (FD_ISSET(pnode->hSocket, &fdsetSend))
 981             {
 982                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 983                 {
 984                     CDataStream& vSend = pnode->vSend;
 985                     if (!vSend.empty())
 986                     {
 987                         int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT);
 988                         if (nBytes > 0)
 989                         {
 990                             vSend.erase(vSend.begin(), vSend.begin() + nBytes);
 991                             pnode->nLastSend = GetTime();
 992                         }
 993                         else if (nBytes < 0)
 994                         {
 995                             // error
 996                             int nErr = WSAGetLastError();
 997                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
 998                             {
 999                                 printf("socket send error %d\n", nErr);
1000                                 pnode->CloseSocketDisconnect();
1001                             }
1002                         }
1003                         if (vSend.size() > SendBufferSize()) {
1004                             if (!pnode->fDisconnect)
1005                                 printf("socket send flood control disconnect (%d bytes)\n", vSend.size());
1006                             pnode->CloseSocketDisconnect();
1007                         }
1008                     }
1009                 }
1010             }
1011
1012             //
1013             // Inactivity checking
1014             //
1015             if (pnode->vSend.empty())
1016                 pnode->nLastSendEmpty = GetTime();
1017             if (GetTime() - pnode->nTimeConnected > 60)
1018             {
1019                 if (pnode->nLastRecv == 0 || pnode->nLastSend == 0)
1020                 {
1021                     printf("socket no message in first 60 seconds, %d %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0);
1022                     pnode->fDisconnect = true;
1023                 }
1024                 else if (GetTime() - pnode->nLastSend > 90*60 && GetTime() - pnode->nLastSendEmpty > 90*60)
1025                 {
1026                     printf("socket not sending\n");
1027                     pnode->fDisconnect = true;
1028                 }
1029                 else if (GetTime() - pnode->nLastRecv > 90*60)
1030                 {
1031                     printf("socket inactivity timeout\n");
1032                     pnode->fDisconnect = true;
1033                 }
1034             }
1035         }
1036         CRITICAL_BLOCK(cs_vNodes)
1037         {
1038             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1039                 pnode->Release();
1040         }
1041
1042         Sleep(10);
1043     }
1044 }
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054 #ifdef USE_UPNP
1055 void ThreadMapPort(void* parg)
1056 {
1057     IMPLEMENT_RANDOMIZE_STACK(ThreadMapPort(parg));
1058     try
1059     {
1060         vnThreadsRunning[5]++;
1061         ThreadMapPort2(parg);
1062         vnThreadsRunning[5]--;
1063     }
1064     catch (std::exception& e) {
1065         vnThreadsRunning[5]--;
1066         PrintException(&e, "ThreadMapPort()");
1067     } catch (...) {
1068         vnThreadsRunning[5]--;
1069         PrintException(NULL, "ThreadMapPort()");
1070     }
1071     printf("ThreadMapPort exiting\n");
1072 }
1073
1074 void ThreadMapPort2(void* parg)
1075 {
1076     printf("ThreadMapPort started\n");
1077
1078     char port[6];
1079     sprintf(port, "%d", GetListenPort());
1080
1081     const char * rootdescurl = 0;
1082     const char * multicastif = 0;
1083     const char * minissdpdpath = 0;
1084     int error = 0;
1085     struct UPNPDev * devlist = 0;
1086     char lanaddr[64];
1087
1088     devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
1089
1090     struct UPNPUrls urls;
1091     struct IGDdatas data;
1092     int r;
1093
1094     r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
1095     if (r == 1)
1096     {
1097         char intClient[16];
1098         char intPort[6];
1099         string strDesc = "Bitcoin " + FormatFullVersion();
1100         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1101                                 port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
1102
1103         if(r!=UPNPCOMMAND_SUCCESS)
1104             printf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
1105                 port, port, lanaddr, r, strupnperror(r));
1106         else
1107             printf("UPnP Port Mapping successful.\n");
1108         loop {
1109             if (fShutdown || !fUseUPnP)
1110             {
1111                 r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port, "TCP", 0);
1112                 printf("UPNP_DeletePortMapping() returned : %d\n", r);
1113                 freeUPNPDevlist(devlist); devlist = 0;
1114                 FreeUPNPUrls(&urls);
1115                 return;
1116             }
1117             Sleep(2000);
1118         }
1119     } else {
1120         printf("No valid UPnP IGDs found\n");
1121         freeUPNPDevlist(devlist); devlist = 0;
1122         if (r != 0)
1123             FreeUPNPUrls(&urls);
1124         loop {
1125             if (fShutdown || !fUseUPnP)
1126                 return;
1127             Sleep(2000);
1128         }
1129     }
1130 }
1131
1132 void MapPort(bool fMapPort)
1133 {
1134     if (fUseUPnP != fMapPort)
1135     {
1136         fUseUPnP = fMapPort;
1137         WriteSetting("fUseUPnP", fUseUPnP);
1138     }
1139     if (fUseUPnP && vnThreadsRunning[5] < 1)
1140     {
1141         if (!CreateThread(ThreadMapPort, NULL))
1142             printf("Error: ThreadMapPort(ThreadMapPort) failed\n");
1143     }
1144 }
1145 #else
1146 void MapPort(bool /* unused fMapPort */)
1147 {
1148     // Intentionally left blank.
1149 }
1150 #endif
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161 static const char *strDNSSeed[] = {
1162     "bitseed.xf2.org",
1163     "dnsseed.bluematt.me",
1164 };
1165
1166 void ThreadDNSAddressSeed(void* parg)
1167 {
1168     IMPLEMENT_RANDOMIZE_STACK(ThreadDNSAddressSeed(parg));
1169     try
1170     {
1171         vnThreadsRunning[6]++;
1172         ThreadDNSAddressSeed2(parg);
1173         vnThreadsRunning[6]--;
1174     }
1175     catch (std::exception& e) {
1176         vnThreadsRunning[6]--;
1177         PrintException(&e, "ThreadDNSAddressSeed()");
1178     } catch (...) {
1179         vnThreadsRunning[6]--;
1180         throw; // support pthread_cancel()
1181     }
1182     printf("ThreadDNSAddressSeed exiting\n");
1183 }
1184
1185 void ThreadDNSAddressSeed2(void* parg)
1186 {
1187     printf("ThreadDNSAddressSeed started\n");
1188     int found = 0;
1189
1190     if (!fTestNet)
1191     {
1192         printf("Loading addresses from DNS seeds (could take a while)\n");
1193         CAddrDB addrDB;
1194         addrDB.TxnBegin();
1195
1196         for (int seed_idx = 0; seed_idx < ARRAYLEN(strDNSSeed); seed_idx++) {
1197             vector<CAddress> vaddr;
1198             if (Lookup(strDNSSeed[seed_idx], vaddr, NODE_NETWORK, -1, true))
1199             {
1200                 BOOST_FOREACH (CAddress& addr, vaddr)
1201                 {
1202                     if (addr.GetByte(3) != 127)
1203                     {
1204                         addr.nTime = 0;
1205                         AddAddress(addr, 0, &addrDB);
1206                         found++;
1207                     }
1208                 }
1209             }
1210         }
1211
1212         addrDB.TxnCommit();  // Save addresses (it's ok if this fails)
1213     }
1214
1215     printf("%d addresses found from DNS seeds\n", found);
1216 }
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229 unsigned int pnSeed[] =
1230 {
1231     0x6884ac63, 0x3ffecead, 0x2919b953, 0x0942fe50, 0x7a1d922e, 0xcdd6734a, 0x953a5bb6, 0x2c46922e,
1232     0xe2a5f143, 0xaa39103a, 0xa06afa5c, 0x135ffd59, 0xe8e82863, 0xf61ef029, 0xf75f042e, 0x2b363532,
1233     0x29b2df42, 0x16b1f64e, 0xd46e281b, 0x5280bf58, 0x60372229, 0x1be58e4f, 0xa8496f45, 0x1fb1a057,
1234     0x756b3844, 0x3bb79445, 0x0b375518, 0xcccb0102, 0xb682bf2e, 0x46431c02, 0x3a81073a, 0xa3771f1f,
1235     0x213a121f, 0x85dc2c1b, 0x56b4323b, 0xb34e8945, 0x3c40b33d, 0xfa276418, 0x1f818d29, 0xebe1e344,
1236     0xf6160a18, 0xf4fa384a, 0x34b09558, 0xb882b543, 0xe3ce2253, 0x6abf56d8, 0xe91b1155, 0x688ee6ad,
1237     0x2efc6058, 0x4792cd47, 0x0c32f757, 0x4c813a46, 0x8c93644a, 0x37507444, 0x813ad218, 0xdac06d4a,
1238     0xe4c63e4b, 0x21a1ea3c, 0x8d88556f, 0x30e9173a, 0x041f681b, 0xdc77ba50, 0xc0072753, 0xceddd44f,
1239     0x052d1743, 0xe3c77a4a, 0x13981c3a, 0x5685d918, 0x3c0e4e70, 0x3e56fb54, 0xb676ae0c, 0xac93c859,
1240     0x22279f43, 0x975a4542, 0xe527f071, 0xea162f2e, 0x3c65a32e, 0x5be5713b, 0x961ec418, 0xb202922e,
1241     0x5ef7be50, 0xce49f53e, 0x05803b47, 0x8463b055, 0x78576153, 0x3ec2ae3a, 0x4bbd7118, 0xafcee043,
1242     0x56a3e8ba, 0x6174de4d, 0x8d01ba4b, 0xc9af564e, 0xdbc9c547, 0xa627474d, 0xdada9244, 0xd3b3083a,
1243     0x523e071f, 0xd6b96f18, 0xbd527c46, 0xdf2bbb4d, 0xd37b4a4b, 0x3a6a2158, 0xc064b055, 0x18a8e055,
1244     0xec4dae3b, 0x0540416c, 0x475b4fbe, 0x064803b2, 0x48e9f062, 0x2898524b, 0xd315ff43, 0xf786d247,
1245     0xc7ea2f3e, 0xc087f043, 0xc163354b, 0x8250284d, 0xed300029, 0xbf36e05c, 0x8eb3ae4c, 0xe7aa623e,
1246     0x7ced0274, 0xdd362c1b, 0x362b995a, 0xca26b629, 0x3fc41618, 0xb97b364e, 0xa05b8729, 0x0f5e3c43,
1247     0xdf942618, 0x6aeb9b5b, 0xbf04762e, 0xfaaeb118, 0x87579958, 0x76520044, 0xc2660c5b, 0x628b201b,
1248     0xf193932e, 0x1c0ad045, 0xff908346, 0x8da9d4da, 0xed201c1f, 0xa47a2b1b, 0x330007d4, 0x8ba1ed47,
1249     0xb2f02d44, 0x7db62c1b, 0x781c454b, 0xc0300029, 0xb7062a45, 0x88b52e3a, 0x78dd6b63, 0x1cb9b718,
1250     0x5d358e47, 0x59912c3b, 0x79607544, 0x5197f759, 0xc023be48, 0xd1013743, 0x0f354057, 0x8e3aac3b,
1251     0x4114693e, 0x22316318, 0xe27dda50, 0x878eac3b, 0x4948a21f, 0x5db7f24c, 0x8ccb6157, 0x26a5de18,
1252     0x0a11bd43, 0x27bb1e41, 0x60a7a951, 0x3e16b35e, 0x07888b53, 0x5648a853, 0x0149fe50, 0xd070a34f,
1253     0x6454c96d, 0xd6e54758, 0xa96dc152, 0x65447861, 0xf6bdf95e, 0x10400202, 0x2c29d483, 0x18174732,
1254     0x1d840618, 0x12e61818, 0x089d3f3c, 0x917e931f, 0xd1b0c90e, 0x25bd3c42, 0xeb05775b, 0x7d550c59,
1255     0x6cfacb01, 0xe4224444, 0xa41dd943, 0x0f5aa643, 0x5e33731b, 0x81036d50, 0x6f46a0d1, 0x7731be43,
1256     0x14840e18, 0xf1e8d059, 0x661d2b1f, 0x40a3201b, 0x9407b843, 0xedf0254d, 0x7bd1a5bc, 0x073dbe51,
1257     0xe864a97b, 0x2efd947b, 0xb9ca0e45, 0x4e2113ad, 0xcc305731, 0xd39ca63c, 0x733df918, 0xda172b1f,
1258     0xaa03b34d, 0x7230fd4d, 0xf1ce6e3a, 0x2e9fab43, 0xa4010750, 0xa928bd18, 0x6809be42, 0xb19de348,
1259     0xff956270, 0x0d795f51, 0xd2dec247, 0x6df5774b, 0xbac11f79, 0xdfb05c75, 0x887683d8, 0xa1e83632,
1260     0x2c0f7671, 0x28bcb65d, 0xac2a7545, 0x3eebfc60, 0x304ad7c4, 0xa215a462, 0xc86f0f58, 0xcfb92ebe,
1261     0x5e23ed82, 0xf506184b, 0xec0f19b7, 0x060c59ad, 0x86ee3174, 0x85380774, 0xa199a562, 0x02b507ae,
1262     0x33eb2163, 0xf2112b1f, 0xb702ba50, 0x131b9618, 0x90ccd04a, 0x08f3273b, 0xecb61718, 0x64b8b44d,
1263     0x182bf4dc, 0xc7b68286, 0x6e318d5f, 0xfdb03654, 0xb3272e54, 0xe014ad4b, 0x274e4a31, 0x7806375c,
1264     0xbc34a748, 0x1b5ad94a, 0x6b54d10e, 0x73e2ae6e, 0x5529d483, 0x8455a76d, 0x99c13f47, 0x1d811741,
1265     0xa9782a78, 0x0b00464d, 0x7266ea50, 0x532dab46, 0x33e1413e, 0x780d0c18, 0x0fb0854e, 0x03370155,
1266     0x2693042e, 0xfa3d824a, 0x2bb1681b, 0x37ea2a18, 0x7fb8414b, 0x32e0713b, 0xacf38d3f, 0xa282716f,
1267     0xb1a09d7b, 0xa04b764b, 0x83c94d18, 0x05ee4c6d, 0x0e795f51, 0x46984352, 0xf80fc247, 0x3fccb946,
1268     0xd7ae244b, 0x0a8e0a4c, 0x57b141bc, 0x3647bed1, 0x1431b052, 0x803a8bbb, 0xfc69056b, 0xf5991862,
1269     0x14963b2e, 0xd35d5dda, 0xc6c73574, 0xc8f1405b, 0x0ca4224d, 0xecd36071, 0xa9461754, 0xe7a0ed72,
1270     0x559e8346, 0x1c9beec1, 0xc786ea4a, 0x9561b44d, 0x9788074d, 0x1a69934f, 0x23c5614c, 0x07c79d4b,
1271     0xc7ee52db, 0xc72df351, 0xcb135e44, 0xa0988346, 0xc211fc4c, 0x87dec34b, 0x1381074d, 0x04a65cb7,
1272     0x4409083a, 0x4a407a4c, 0x92b8d37d, 0xacf50b4d, 0xa58aa5bc, 0x448f801f, 0x9c83762e, 0x6fd5734a,
1273     0xfe2d454b, 0x84144c55, 0x05190e4c, 0xb2151448, 0x63867a3e, 0x16099018, 0x9c010d3c, 0x962d8f3d,
1274     0xd51ee453, 0x9d86801f, 0x68e87b47, 0x6bf7bb73, 0x5fc7910e, 0x10d90118, 0x3db04442, 0x729d3e4b,
1275     0xc397d842, 0x57bb15ad, 0x72f31f4e, 0xc9380043, 0x2bb24e18, 0xd9b8ab50, 0xb786801f, 0xf4dc4847,
1276     0x85f4bb51, 0x4435995b, 0x5ba07e40, 0x2c57392e, 0x3628124b, 0x9839b64b, 0x6fe8b24d, 0xaddce847,
1277     0x75260e45, 0x0c572a43, 0xfea21902, 0xb9f9742e, 0x5a70d443, 0x8fc5910e, 0x868d4744, 0x56245e02,
1278     0xd7eb5f02, 0x35c12c1b, 0x4373034b, 0x8786554c, 0xa6facf18, 0x4b11a31f, 0x3570664e, 0x5a64bc42,
1279     0x0b03983f, 0x8f457e4c, 0x0fd874c3, 0xb6cf31b2, 0x2bbc2d4e, 0x146ca5b2, 0x9d00b150, 0x048a4153,
1280     0xca4dcd43, 0xc1607cca, 0x8234cf57, 0x9c7daead, 0x3dc07658, 0xea5c6e4c, 0xf1a0084e, 0x16d2ee53,
1281     0x1b849418, 0xfe913a47, 0x1e988f62, 0x208b644c, 0xc55ee980, 0xbdbce747, 0xf59a384e, 0x0f56091b,
1282     0x7417b745, 0x0c37344e, 0x2c62ab47, 0xf8533a4d, 0x8030084d, 0x76b93c4b, 0xda6ea0ad, 0x3c54f618,
1283     0x63b0de1f, 0x7370d858, 0x1a70bb4c, 0xdda63b2e, 0x60b2ba50, 0x1ba7d048, 0xbe1b2c1b, 0xabea5747,
1284     0x29ad2e4d, 0xe8cd7642, 0x66c80e18, 0x138bf34a, 0xc6145e44, 0x2586794c, 0x07bc5478, 0x0da0b14d,
1285     0x8f95354e, 0x9eb11c62, 0xa1545e46, 0x2e7a2602, 0x408c9c3d, 0x59065d55, 0xf51d1a4c, 0x3bbc6a4e,
1286     0xc71b2a2e, 0xcdaaa545, 0x17d659d0, 0x5202e7ad, 0xf1b68445, 0x93375961, 0xbd88a043, 0x066ad655,
1287     0x890f6318, 0x7b7dca47, 0x99bdd662, 0x3bb4fc53, 0x1231efdc, 0xc0a99444, 0x96bbea47, 0x61ed8748,
1288     0x27dfa73b, 0x8d4d1754, 0x3460042e, 0x551f0c4c, 0x8d0e0718, 0x162ddc53, 0x53231718, 0x1ecd65d0,
1289     0x944d28bc, 0x3b79d058, 0xaff97fbc, 0x4860006c, 0xc101c90e, 0xace41743, 0xa5975d4c, 0x5cc2703e,
1290     0xb55a4450, 0x02d18840, 0xee2765ae, 0xd6012fd5, 0x24c94d7d, 0x8c6eec47, 0x7520ba5d, 0x9e15e460,
1291     0x8510b04c, 0x75ec3847, 0x1dfa6661, 0xe172b3ad, 0x5744c90e, 0x52a0a152, 0x8d6fad18, 0x67b74b6d,
1292     0x93a089b2, 0x0f3ac5d5, 0xe5de1855, 0x43d25747, 0x4bad804a, 0x55b408d8, 0x60a36441, 0xf553e860,
1293     0xdb2fa2c8, 0x03152b32, 0xdd27a7d5, 0x3116a8b8, 0x0a1d708c, 0xeee2f13c, 0x6acf436f, 0xce6eb4ca,
1294     0x101cd3d9, 0x1c48a6b8, 0xe57d6f44, 0x93dcf562,
1295 };
1296
1297
1298
1299 void ThreadOpenConnections(void* parg)
1300 {
1301     IMPLEMENT_RANDOMIZE_STACK(ThreadOpenConnections(parg));
1302     try
1303     {
1304         vnThreadsRunning[1]++;
1305         ThreadOpenConnections2(parg);
1306         vnThreadsRunning[1]--;
1307     }
1308     catch (std::exception& e) {
1309         vnThreadsRunning[1]--;
1310         PrintException(&e, "ThreadOpenConnections()");
1311     } catch (...) {
1312         vnThreadsRunning[1]--;
1313         PrintException(NULL, "ThreadOpenConnections()");
1314     }
1315     printf("ThreadOpenConnections exiting\n");
1316 }
1317
1318 void ThreadOpenConnections2(void* parg)
1319 {
1320     printf("ThreadOpenConnections started\n");
1321
1322     // Connect to specific addresses
1323     if (mapArgs.count("-connect"))
1324     {
1325         for (int64 nLoop = 0;; nLoop++)
1326         {
1327             BOOST_FOREACH(string strAddr, mapMultiArgs["-connect"])
1328             {
1329                 CAddress addr(strAddr, fAllowDNS);
1330                 if (addr.IsValid())
1331                     OpenNetworkConnection(addr);
1332                 for (int i = 0; i < 10 && i < nLoop; i++)
1333                 {
1334                     Sleep(500);
1335                     if (fShutdown)
1336                         return;
1337                 }
1338             }
1339         }
1340     }
1341
1342     // Connect to manually added nodes first
1343     if (mapArgs.count("-addnode"))
1344     {
1345         BOOST_FOREACH(string strAddr, mapMultiArgs["-addnode"])
1346         {
1347             CAddress addr(strAddr, fAllowDNS);
1348             if (addr.IsValid())
1349             {
1350                 OpenNetworkConnection(addr);
1351                 Sleep(500);
1352                 if (fShutdown)
1353                     return;
1354             }
1355         }
1356     }
1357
1358     // Initiate network connections
1359     int64 nStart = GetTime();
1360     loop
1361     {
1362         // Limit outbound connections
1363         vnThreadsRunning[1]--;
1364         Sleep(500);
1365         loop
1366         {
1367             int nOutbound = 0;
1368             CRITICAL_BLOCK(cs_vNodes)
1369                 BOOST_FOREACH(CNode* pnode, vNodes)
1370                     if (!pnode->fInbound)
1371                         nOutbound++;
1372             int nMaxOutboundConnections = MAX_OUTBOUND_CONNECTIONS;
1373             nMaxOutboundConnections = min(nMaxOutboundConnections, (int)GetArg("-maxconnections", 125));
1374             if (nOutbound < nMaxOutboundConnections)
1375                 break;
1376             Sleep(2000);
1377             if (fShutdown)
1378                 return;
1379         }
1380         vnThreadsRunning[1]++;
1381         if (fShutdown)
1382             return;
1383
1384         CRITICAL_BLOCK(cs_mapAddresses)
1385         {
1386             // Add seed nodes if IRC isn't working
1387             bool fTOR = (fUseProxy && addrProxy.port == htons(9050));
1388             if (mapAddresses.empty() && (GetTime() - nStart > 60 || fTOR) && !fTestNet)
1389             {
1390                 for (int i = 0; i < ARRAYLEN(pnSeed); i++)
1391                 {
1392                     // It'll only connect to one or two seed nodes because once it connects,
1393                     // it'll get a pile of addresses with newer timestamps.
1394                     // Seed nodes are given a random 'last seen time' of between one and two
1395                     // weeks ago.
1396                     const int64 nOneWeek = 7*24*60*60;
1397                     CAddress addr;
1398                     addr.ip = pnSeed[i];
1399                     addr.nTime = GetTime()-GetRand(nOneWeek)-nOneWeek;
1400                     AddAddress(addr);
1401                 }
1402             }
1403         }
1404
1405
1406         //
1407         // Choose an address to connect to based on most recently seen
1408         //
1409         CAddress addrConnect;
1410         int64 nBest = INT64_MIN;
1411
1412         // Only connect to one address per a.b.?.? range.
1413         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
1414         set<unsigned int> setConnected;
1415         CRITICAL_BLOCK(cs_vNodes)
1416             BOOST_FOREACH(CNode* pnode, vNodes)
1417                 setConnected.insert(pnode->addr.ip & 0x0000ffff);
1418
1419         CRITICAL_BLOCK(cs_mapAddresses)
1420         {
1421             BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
1422             {
1423                 const CAddress& addr = item.second;
1424                 if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.ip & 0x0000ffff))
1425                     continue;
1426                 int64 nSinceLastSeen = GetAdjustedTime() - addr.nTime;
1427                 int64 nSinceLastTry = GetAdjustedTime() - addr.nLastTry;
1428
1429                 // Randomize the order in a deterministic way, putting the standard port first
1430                 int64 nRandomizer = (uint64)(nStart * 4951 + addr.nLastTry * 9567851 + addr.ip * 7789) % (2 * 60 * 60);
1431                 if (addr.port != htons(GetDefaultPort()))
1432                     nRandomizer += 2 * 60 * 60;
1433
1434                 // Last seen  Base retry frequency
1435                 //   <1 hour   10 min
1436                 //    1 hour    1 hour
1437                 //    4 hours   2 hours
1438                 //   24 hours   5 hours
1439                 //   48 hours   7 hours
1440                 //    7 days   13 hours
1441                 //   30 days   27 hours
1442                 //   90 days   46 hours
1443                 //  365 days   93 hours
1444                 int64 nDelay = (int64)(3600.0 * sqrt(fabs((double)nSinceLastSeen) / 3600.0) + nRandomizer);
1445
1446                 // Fast reconnect for one hour after last seen
1447                 if (nSinceLastSeen < 60 * 60)
1448                     nDelay = 10 * 60;
1449
1450                 // Limit retry frequency
1451                 if (nSinceLastTry < nDelay)
1452                     continue;
1453
1454                 // If we have IRC, we'll be notified when they first come online,
1455                 // and again every 24 hours by the refresh broadcast.
1456                 if (nGotIRCAddresses > 0 && vNodes.size() >= 2 && nSinceLastSeen > 24 * 60 * 60)
1457                     continue;
1458
1459                 // Only try the old stuff if we don't have enough connections
1460                 if (vNodes.size() >= 8 && nSinceLastSeen > 24 * 60 * 60)
1461                     continue;
1462
1463                 // If multiple addresses are ready, prioritize by time since
1464                 // last seen and time since last tried.
1465                 int64 nScore = min(nSinceLastTry, (int64)24 * 60 * 60) - nSinceLastSeen - nRandomizer;
1466                 if (nScore > nBest)
1467                 {
1468                     nBest = nScore;
1469                     addrConnect = addr;
1470                 }
1471             }
1472         }
1473
1474         if (addrConnect.IsValid())
1475             OpenNetworkConnection(addrConnect);
1476     }
1477 }
1478
1479 bool OpenNetworkConnection(const CAddress& addrConnect)
1480 {
1481     //
1482     // Initiate outbound network connection
1483     //
1484     if (fShutdown)
1485         return false;
1486     if (addrConnect.ip == addrLocalHost.ip || !addrConnect.IsIPv4() || FindNode(addrConnect.ip))
1487         return false;
1488
1489     vnThreadsRunning[1]--;
1490     CNode* pnode = ConnectNode(addrConnect);
1491     vnThreadsRunning[1]++;
1492     if (fShutdown)
1493         return false;
1494     if (!pnode)
1495         return false;
1496     pnode->fNetworkNode = true;
1497
1498     return true;
1499 }
1500
1501
1502
1503
1504
1505
1506
1507
1508 void ThreadMessageHandler(void* parg)
1509 {
1510     IMPLEMENT_RANDOMIZE_STACK(ThreadMessageHandler(parg));
1511     try
1512     {
1513         vnThreadsRunning[2]++;
1514         ThreadMessageHandler2(parg);
1515         vnThreadsRunning[2]--;
1516     }
1517     catch (std::exception& e) {
1518         vnThreadsRunning[2]--;
1519         PrintException(&e, "ThreadMessageHandler()");
1520     } catch (...) {
1521         vnThreadsRunning[2]--;
1522         PrintException(NULL, "ThreadMessageHandler()");
1523     }
1524     printf("ThreadMessageHandler exiting\n");
1525 }
1526
1527 void ThreadMessageHandler2(void* parg)
1528 {
1529     printf("ThreadMessageHandler started\n");
1530     SetThreadPriority(THREAD_PRIORITY_BELOW_NORMAL);
1531     while (!fShutdown)
1532     {
1533         vector<CNode*> vNodesCopy;
1534         CRITICAL_BLOCK(cs_vNodes)
1535         {
1536             vNodesCopy = vNodes;
1537             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1538                 pnode->AddRef();
1539         }
1540
1541         // Poll the connected nodes for messages
1542         CNode* pnodeTrickle = NULL;
1543         if (!vNodesCopy.empty())
1544             pnodeTrickle = vNodesCopy[GetRand(vNodesCopy.size())];
1545         BOOST_FOREACH(CNode* pnode, vNodesCopy)
1546         {
1547             // Receive messages
1548             TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
1549                 ProcessMessages(pnode);
1550             if (fShutdown)
1551                 return;
1552
1553             // Send messages
1554             TRY_CRITICAL_BLOCK(pnode->cs_vSend)
1555                 SendMessages(pnode, pnode == pnodeTrickle);
1556             if (fShutdown)
1557                 return;
1558         }
1559
1560         CRITICAL_BLOCK(cs_vNodes)
1561         {
1562             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1563                 pnode->Release();
1564         }
1565
1566         // Wait and allow messages to bunch up.
1567         // Reduce vnThreadsRunning so StopNode has permission to exit while
1568         // we're sleeping, but we must always check fShutdown after doing this.
1569         vnThreadsRunning[2]--;
1570         Sleep(100);
1571         if (fRequestShutdown)
1572             Shutdown(NULL);
1573         vnThreadsRunning[2]++;
1574         if (fShutdown)
1575             return;
1576     }
1577 }
1578
1579
1580
1581
1582
1583
1584 bool BindListenPort(string& strError)
1585 {
1586     strError = "";
1587     int nOne = 1;
1588     addrLocalHost.port = htons(GetListenPort());
1589
1590 #ifdef __WXMSW__
1591     // Initialize Windows Sockets
1592     WSADATA wsadata;
1593     int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
1594     if (ret != NO_ERROR)
1595     {
1596         strError = strprintf("Error: TCP/IP socket library failed to start (WSAStartup returned error %d)", ret);
1597         printf("%s\n", strError.c_str());
1598         return false;
1599     }
1600 #endif
1601
1602     // Create socket for listening for incoming connections
1603     hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1604     if (hListenSocket == INVALID_SOCKET)
1605     {
1606         strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError());
1607         printf("%s\n", strError.c_str());
1608         return false;
1609     }
1610
1611 #ifdef SO_NOSIGPIPE
1612     // Different way of disabling SIGPIPE on BSD
1613     setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int));
1614 #endif
1615
1616 #ifndef __WXMSW__
1617     // Allow binding if the port is still in TIME_WAIT state after
1618     // the program was closed and restarted.  Not an issue on windows.
1619     setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
1620 #endif
1621
1622 #ifdef __WXMSW__
1623     // Set to nonblocking, incoming connections will also inherit this
1624     if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR)
1625 #else
1626     if (fcntl(hListenSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
1627 #endif
1628     {
1629         strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %d)", WSAGetLastError());
1630         printf("%s\n", strError.c_str());
1631         return false;
1632     }
1633
1634     // The sockaddr_in structure specifies the address family,
1635     // IP address, and port for the socket that is being bound
1636     struct sockaddr_in sockaddr;
1637     memset(&sockaddr, 0, sizeof(sockaddr));
1638     sockaddr.sin_family = AF_INET;
1639     sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer
1640     sockaddr.sin_port = htons(GetListenPort());
1641     if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
1642     {
1643         int nErr = WSAGetLastError();
1644         if (nErr == WSAEADDRINUSE)
1645             strError = strprintf(_("Unable to bind to port %d on this computer.  Bitcoin is probably already running."), ntohs(sockaddr.sin_port));
1646         else
1647             strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr);
1648         printf("%s\n", strError.c_str());
1649         return false;
1650     }
1651     printf("Bound to port %d\n", ntohs(sockaddr.sin_port));
1652
1653     // Listen for incoming connections
1654     if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
1655     {
1656         strError = strprintf("Error: Listening for incoming connections failed (listen returned error %d)", WSAGetLastError());
1657         printf("%s\n", strError.c_str());
1658         return false;
1659     }
1660
1661     return true;
1662 }
1663
1664 void StartNode(void* parg)
1665 {
1666     if (pnodeLocalHost == NULL)
1667         pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress("127.0.0.1", 0, false, nLocalServices));
1668
1669 #ifdef __WXMSW__
1670     // Get local host ip
1671     char pszHostName[1000] = "";
1672     if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
1673     {
1674         vector<CAddress> vaddr;
1675         if (Lookup(pszHostName, vaddr, nLocalServices, -1, true))
1676             BOOST_FOREACH (const CAddress &addr, vaddr)
1677                 if (addr.GetByte(3) != 127)
1678                 {
1679                     addrLocalHost = addr;
1680                     break;
1681                 }
1682     }
1683 #else
1684     // Get local host ip
1685     struct ifaddrs* myaddrs;
1686     if (getifaddrs(&myaddrs) == 0)
1687     {
1688         for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
1689         {
1690             if (ifa->ifa_addr == NULL) continue;
1691             if ((ifa->ifa_flags & IFF_UP) == 0) continue;
1692             if (strcmp(ifa->ifa_name, "lo") == 0) continue;
1693             if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
1694             char pszIP[100];
1695             if (ifa->ifa_addr->sa_family == AF_INET)
1696             {
1697                 struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
1698                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL)
1699                     printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP);
1700
1701                 // Take the first IP that isn't loopback 127.x.x.x
1702                 CAddress addr(*(unsigned int*)&s4->sin_addr, GetListenPort(), nLocalServices);
1703                 if (addr.IsValid() && addr.GetByte(3) != 127)
1704                 {
1705                     addrLocalHost = addr;
1706                     break;
1707                 }
1708             }
1709             else if (ifa->ifa_addr->sa_family == AF_INET6)
1710             {
1711                 struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
1712                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL)
1713                     printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP);
1714             }
1715         }
1716         freeifaddrs(myaddrs);
1717     }
1718 #endif
1719     printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1720
1721     if (fUseProxy || mapArgs.count("-connect") || fNoListen)
1722     {
1723         // Proxies can't take incoming connections
1724         addrLocalHost.ip = CAddress("0.0.0.0").ip;
1725         printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1726     }
1727     else
1728     {
1729         CreateThread(ThreadGetMyExternalIP, NULL);
1730     }
1731
1732     //
1733     // Start threads
1734     //
1735
1736     if (GetBoolArg("-nodnsseed"))
1737         printf("DNS seeding disabled\n");
1738     else
1739         if (!CreateThread(ThreadDNSAddressSeed, NULL))
1740             printf("Error: CreateThread(ThreadDNSAddressSeed) failed\n");
1741
1742     // Map ports with UPnP
1743     if (fHaveUPnP)
1744         MapPort(fUseUPnP);
1745
1746     // Get addresses from IRC and advertise ours
1747     if (!CreateThread(ThreadIRCSeed, NULL))
1748         printf("Error: CreateThread(ThreadIRCSeed) failed\n");
1749
1750     // Send and receive from sockets, accept connections
1751     if (!CreateThread(ThreadSocketHandler, NULL))
1752         printf("Error: CreateThread(ThreadSocketHandler) failed\n");
1753
1754     // Initiate outbound connections
1755     if (!CreateThread(ThreadOpenConnections, NULL))
1756         printf("Error: CreateThread(ThreadOpenConnections) failed\n");
1757
1758     // Process messages
1759     if (!CreateThread(ThreadMessageHandler, NULL))
1760         printf("Error: CreateThread(ThreadMessageHandler) failed\n");
1761
1762     // Generate coins in the background
1763     GenerateBitcoins(fGenerateBitcoins, pwalletMain);
1764 }
1765
1766 bool StopNode()
1767 {
1768     printf("StopNode()\n");
1769     fShutdown = true;
1770     nTransactionsUpdated++;
1771     int64 nStart = GetTime();
1772     while (vnThreadsRunning[0] > 0 || vnThreadsRunning[2] > 0 || vnThreadsRunning[3] > 0 || vnThreadsRunning[4] > 0
1773 #ifdef USE_UPNP
1774         || vnThreadsRunning[5] > 0
1775 #endif
1776     )
1777     {
1778         if (GetTime() - nStart > 20)
1779             break;
1780         Sleep(20);
1781     }
1782     if (vnThreadsRunning[0] > 0) printf("ThreadSocketHandler still running\n");
1783     if (vnThreadsRunning[1] > 0) printf("ThreadOpenConnections still running\n");
1784     if (vnThreadsRunning[2] > 0) printf("ThreadMessageHandler still running\n");
1785     if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n");
1786     if (vnThreadsRunning[4] > 0) printf("ThreadRPCServer still running\n");
1787     if (fHaveUPnP && vnThreadsRunning[5] > 0) printf("ThreadMapPort still running\n");
1788     if (vnThreadsRunning[6] > 0) printf("ThreadDNSAddressSeed still running\n");
1789     while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
1790         Sleep(20);
1791     Sleep(50);
1792
1793     return true;
1794 }
1795
1796 class CNetCleanup
1797 {
1798 public:
1799     CNetCleanup()
1800     {
1801     }
1802     ~CNetCleanup()
1803     {
1804         // Close sockets
1805         BOOST_FOREACH(CNode* pnode, vNodes)
1806             if (pnode->hSocket != INVALID_SOCKET)
1807                 closesocket(pnode->hSocket);
1808         if (hListenSocket != INVALID_SOCKET)
1809             if (closesocket(hListenSocket) == SOCKET_ERROR)
1810                 printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
1811
1812 #ifdef __WXMSW__
1813         // Shutdown Windows Sockets
1814         WSACleanup();
1815 #endif
1816     }
1817 }
1818 instance_of_cnetcleanup;