src/net.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2012 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   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 WIN32
  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 WIN32
 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 WIN32
 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 WIN32
 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 WIN32
 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     CAddress *paddrFound = NULL;
 500
 501     CRITICAL_BLOCK(cs_mapAddresses)
 502     {
 503         // Only if it's been published already
 504         map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
 505         if (it != mapAddresses.end())
 506             paddrFound = &(*it).second;
 507     }
 508
 509     if (paddrFound)
 510     {
 511         int64 nUpdateInterval = 20 * 60;
 512         if (paddrFound->nTime < GetAdjustedTime() - nUpdateInterval)
 513         {
 514             // Periodically update most recently seen time
 515             paddrFound->nTime = GetAdjustedTime();
 516             CAddrDB addrdb;
 517             addrdb.WriteAddress(*paddrFound);
 518         }
 519     }
 520 }
 521
 522
 523
 524
 525
 526 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1)
 527 {
 528     // If the dialog might get closed before the reply comes back,
 529     // call this in the destructor so it doesn't get called after it's deleted.
 530     CRITICAL_BLOCK(cs_vNodes)
 531     {
 532         BOOST_FOREACH(CNode* pnode, vNodes)
 533         {
 534             CRITICAL_BLOCK(pnode->cs_mapRequests)
 535             {
 536                 for (map<uint256, CRequestTracker>::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();)
 537                 {
 538                     CRequestTracker& tracker = (*mi).second;
 539                     if (tracker.fn == fn && tracker.param1 == param1)
 540                         pnode->mapRequests.erase(mi++);
 541                     else
 542                         mi++;
 543                 }
 544             }
 545         }
 546     }
 547 }
 548
 549
 550
 551
 552
 553
 554
 555 //
 556 // Subscription methods for the broadcast and subscription system.
 557 // Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT.
 558 //
 559 // The subscription system uses a meet-in-the-middle strategy.
 560 // With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers
 561 // subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through.
 562 //
 563
 564 bool AnySubscribed(unsigned int nChannel)
 565 {
 566     if (pnodeLocalHost->IsSubscribed(nChannel))
 567         return true;
 568     CRITICAL_BLOCK(cs_vNodes)
 569         BOOST_FOREACH(CNode* pnode, vNodes)
 570             if (pnode->IsSubscribed(nChannel))
 571                 return true;
 572     return false;
 573 }
 574
 575 bool CNode::IsSubscribed(unsigned int nChannel)
 576 {
 577     if (nChannel >= vfSubscribe.size())
 578         return false;
 579     return vfSubscribe[nChannel];
 580 }
 581
 582 void CNode::Subscribe(unsigned int nChannel, unsigned int nHops)
 583 {
 584     if (nChannel >= vfSubscribe.size())
 585         return;
 586
 587     if (!AnySubscribed(nChannel))
 588     {
 589         // Relay subscribe
 590         CRITICAL_BLOCK(cs_vNodes)
 591             BOOST_FOREACH(CNode* pnode, vNodes)
 592                 if (pnode != this)
 593                     pnode->PushMessage("subscribe", nChannel, nHops);
 594     }
 595
 596     vfSubscribe[nChannel] = true;
 597 }
 598
 599 void CNode::CancelSubscribe(unsigned int nChannel)
 600 {
 601     if (nChannel >= vfSubscribe.size())
 602         return;
 603
 604     // Prevent from relaying cancel if wasn't subscribed
 605     if (!vfSubscribe[nChannel])
 606         return;
 607     vfSubscribe[nChannel] = false;
 608
 609     if (!AnySubscribed(nChannel))
 610     {
 611         // Relay subscription cancel
 612         CRITICAL_BLOCK(cs_vNodes)
 613             BOOST_FOREACH(CNode* pnode, vNodes)
 614                 if (pnode != this)
 615                     pnode->PushMessage("sub-cancel", nChannel);
 616     }
 617 }
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627 CNode* FindNode(unsigned int ip)
 628 {
 629     CRITICAL_BLOCK(cs_vNodes)
 630     {
 631         BOOST_FOREACH(CNode* pnode, vNodes)
 632             if (pnode->addr.ip == ip)
 633                 return (pnode);
 634     }
 635     return NULL;
 636 }
 637
 638 CNode* FindNode(CAddress addr)
 639 {
 640     CRITICAL_BLOCK(cs_vNodes)
 641     {
 642         BOOST_FOREACH(CNode* pnode, vNodes)
 643             if (pnode->addr == addr)
 644                 return (pnode);
 645     }
 646     return NULL;
 647 }
 648
 649 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout)
 650 {
 651     if (addrConnect.ip == addrLocalHost.ip)
 652         return NULL;
 653
 654     // Look for an existing connection
 655     CNode* pnode = FindNode(addrConnect.ip);
 656     if (pnode)
 657     {
 658         if (nTimeout != 0)
 659             pnode->AddRef(nTimeout);
 660         else
 661             pnode->AddRef();
 662         return pnode;
 663     }
 664
 665     /// debug print
 666     printf("trying connection %s lastseen=%.1fhrs lasttry=%.1fhrs\n",
 667         addrConnect.ToString().c_str(),
 668         (double)(addrConnect.nTime - GetAdjustedTime())/3600.0,
 669         (double)(addrConnect.nLastTry - GetAdjustedTime())/3600.0);
 670
 671     CRITICAL_BLOCK(cs_mapAddresses)
 672         mapAddresses[addrConnect.GetKey()].nLastTry = GetAdjustedTime();
 673
 674     // Connect
 675     SOCKET hSocket;
 676     if (ConnectSocket(addrConnect, hSocket))
 677     {
 678         /// debug print
 679         printf("connected %s\n", addrConnect.ToString().c_str());
 680
 681         // Set to nonblocking
 682 #ifdef WIN32
 683         u_long nOne = 1;
 684         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR)
 685             printf("ConnectSocket() : ioctlsocket nonblocking setting failed, error %d\n", WSAGetLastError());
 686 #else
 687         if (fcntl(hSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
 688             printf("ConnectSocket() : fcntl nonblocking setting failed, error %d\n", errno);
 689 #endif
 690
 691         // Add node
 692         CNode* pnode = new CNode(hSocket, addrConnect, false);
 693         if (nTimeout != 0)
 694             pnode->AddRef(nTimeout);
 695         else
 696             pnode->AddRef();
 697         CRITICAL_BLOCK(cs_vNodes)
 698             vNodes.push_back(pnode);
 699
 700         pnode->nTimeConnected = GetTime();
 701         return pnode;
 702     }
 703     else
 704     {
 705         return NULL;
 706     }
 707 }
 708
 709 void CNode::CloseSocketDisconnect()
 710 {
 711     fDisconnect = true;
 712     if (hSocket != INVALID_SOCKET)
 713     {
 714         if (fDebug)
 715             printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 716         printf("disconnecting node %s\n", addr.ToString().c_str());
 717         closesocket(hSocket);
 718         hSocket = INVALID_SOCKET;
 719     }
 720 }
 721
 722 void CNode::Cleanup()
 723 {
 724     // All of a nodes broadcasts and subscriptions are automatically torn down
 725     // when it goes down, so a node has to stay up to keep its broadcast going.
 726
 727     // Cancel subscriptions
 728     for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++)
 729         if (vfSubscribe[nChannel])
 730             CancelSubscribe(nChannel);
 731 }
 732
 733
 734 std::map<unsigned int, int64> CNode::setBanned;
 735 CCriticalSection CNode::cs_setBanned;
 736
 737 void CNode::ClearBanned()
 738 {
 739     setBanned.clear();
 740 }
 741
 742 bool CNode::IsBanned(unsigned int ip)
 743 {
 744     bool fResult = false;
 745     CRITICAL_BLOCK(cs_setBanned)
 746     {
 747         std::map<unsigned int, int64>::iterator i = setBanned.find(ip);
 748         if (i != setBanned.end())
 749         {
 750             int64 t = (*i).second;
 751             if (GetTime() < t)
 752                 fResult = true;
 753         }
 754     }
 755     return fResult;
 756 }
 757
 758 bool CNode::Misbehaving(int howmuch)
 759 {
 760     if (addr.IsLocal())
 761     {
 762         printf("Warning: local node %s misbehaving\n", addr.ToString().c_str());
 763         return false;
 764     }
 765
 766     nMisbehavior += howmuch;
 767     if (nMisbehavior >= GetArg("-banscore", 100))
 768     {
 769         int64 banTime = GetTime()+GetArg("-bantime", 60*60*24);  // Default 24-hour ban
 770         CRITICAL_BLOCK(cs_setBanned)
 771             if (setBanned[addr.ip] < banTime)
 772                 setBanned[addr.ip] = banTime;
 773         CloseSocketDisconnect();
 774         printf("Disconnected %s for misbehavior (score=%d)\n", addr.ToString().c_str(), nMisbehavior);
 775         return true;
 776     }
 777     return false;
 778 }
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791 void ThreadSocketHandler(void* parg)
 792 {
 793     IMPLEMENT_RANDOMIZE_STACK(ThreadSocketHandler(parg));
 794     try
 795     {
 796         vnThreadsRunning[0]++;
 797         ThreadSocketHandler2(parg);
 798         vnThreadsRunning[0]--;
 799     }
 800     catch (std::exception& e) {
 801         vnThreadsRunning[0]--;
 802         PrintException(&e, "ThreadSocketHandler()");
 803     } catch (...) {
 804         vnThreadsRunning[0]--;
 805         throw; // support pthread_cancel()
 806     }
 807     printf("ThreadSocketHandler exiting\n");
 808 }
 809
 810 void ThreadSocketHandler2(void* parg)
 811 {
 812     printf("ThreadSocketHandler started\n");
 813     list<CNode*> vNodesDisconnected;
 814     int nPrevNodeCount = 0;
 815
 816     loop
 817     {
 818         //
 819         // Disconnect nodes
 820         //
 821         CRITICAL_BLOCK(cs_vNodes)
 822         {
 823             // Disconnect unused nodes
 824             vector<CNode*> vNodesCopy = vNodes;
 825             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 826             {
 827                 if (pnode->fDisconnect ||
 828                     (pnode->GetRefCount() <= 0 && pnode->vRecv.empty() && pnode->vSend.empty()))
 829                 {
 830                     // remove from vNodes
 831                     vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
 832
 833                     // close socket and cleanup
 834                     pnode->CloseSocketDisconnect();
 835                     pnode->Cleanup();
 836
 837                     // hold in disconnected pool until all refs are released
 838                     pnode->nReleaseTime = max(pnode->nReleaseTime, GetTime() + 15 * 60);
 839                     if (pnode->fNetworkNode || pnode->fInbound)
 840                         pnode->Release();
 841                     vNodesDisconnected.push_back(pnode);
 842                 }
 843             }
 844
 845             // Delete disconnected nodes
 846             list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
 847             BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)
 848             {
 849                 // wait until threads are done using it
 850                 if (pnode->GetRefCount() <= 0)
 851                 {
 852                     bool fDelete = false;
 853                     TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 854                      TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
 855                       TRY_CRITICAL_BLOCK(pnode->cs_mapRequests)
 856                        TRY_CRITICAL_BLOCK(pnode->cs_inventory)
 857                         fDelete = true;
 858                     if (fDelete)
 859                     {
 860                         vNodesDisconnected.remove(pnode);
 861                         delete pnode;
 862                     }
 863                 }
 864             }
 865         }
 866         if (vNodes.size() != nPrevNodeCount)
 867         {
 868             nPrevNodeCount = vNodes.size();
 869             MainFrameRepaint();
 870         }
 871
 872
 873         //
 874         // Find which sockets have data to receive
 875         //
 876         struct timeval timeout;
 877         timeout.tv_sec  = 0;
 878         timeout.tv_usec = 50000; // frequency to poll pnode->vSend
 879
 880         fd_set fdsetRecv;
 881         fd_set fdsetSend;
 882         fd_set fdsetError;
 883         FD_ZERO(&fdsetRecv);
 884         FD_ZERO(&fdsetSend);
 885         FD_ZERO(&fdsetError);
 886         SOCKET hSocketMax = 0;
 887
 888         if(hListenSocket != INVALID_SOCKET)
 889             FD_SET(hListenSocket, &fdsetRecv);
 890         hSocketMax = max(hSocketMax, hListenSocket);
 891         CRITICAL_BLOCK(cs_vNodes)
 892         {
 893             BOOST_FOREACH(CNode* pnode, vNodes)
 894             {
 895                 if (pnode->hSocket == INVALID_SOCKET)
 896                     continue;
 897                 FD_SET(pnode->hSocket, &fdsetRecv);
 898                 FD_SET(pnode->hSocket, &fdsetError);
 899                 hSocketMax = max(hSocketMax, pnode->hSocket);
 900                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 901                     if (!pnode->vSend.empty())
 902                         FD_SET(pnode->hSocket, &fdsetSend);
 903             }
 904         }
 905
 906         vnThreadsRunning[0]--;
 907         int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
 908         vnThreadsRunning[0]++;
 909         if (fShutdown)
 910             return;
 911         if (nSelect == SOCKET_ERROR)
 912         {
 913             int nErr = WSAGetLastError();
 914             if (hSocketMax > -1)
 915             {
 916                 printf("socket select error %d\n", nErr);
 917                 for (int i = 0; i <= hSocketMax; i++)
 918                     FD_SET(i, &fdsetRecv);
 919             }
 920             FD_ZERO(&fdsetSend);
 921             FD_ZERO(&fdsetError);
 922             Sleep(timeout.tv_usec/1000);
 923         }
 924
 925
 926         //
 927         // Accept new connections
 928         //
 929         if (hListenSocket != INVALID_SOCKET && FD_ISSET(hListenSocket, &fdsetRecv))
 930         {
 931             struct sockaddr_in sockaddr;
 932             socklen_t len = sizeof(sockaddr);
 933             SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
 934             CAddress addr(sockaddr);
 935             int nInbound = 0;
 936
 937             CRITICAL_BLOCK(cs_vNodes)
 938                 BOOST_FOREACH(CNode* pnode, vNodes)
 939                 if (pnode->fInbound)
 940                     nInbound++;
 941             if (hSocket == INVALID_SOCKET)
 942             {
 943                 if (WSAGetLastError() != WSAEWOULDBLOCK)
 944                     printf("socket error accept failed: %d\n", WSAGetLastError());
 945             }
 946             else if (nInbound >= GetArg("-maxconnections", 125) - MAX_OUTBOUND_CONNECTIONS)
 947             {
 948                 closesocket(hSocket);
 949             }
 950             else if (CNode::IsBanned(addr.ip))
 951             {
 952                 printf("connetion from %s dropped (banned)\n", addr.ToString().c_str());
 953                 closesocket(hSocket);
 954             }
 955             else
 956             {
 957                 printf("accepted connection %s\n", addr.ToString().c_str());
 958                 CNode* pnode = new CNode(hSocket, addr, true);
 959                 pnode->AddRef();
 960                 CRITICAL_BLOCK(cs_vNodes)
 961                     vNodes.push_back(pnode);
 962             }
 963         }
 964
 965
 966         //
 967         // Service each socket
 968         //
 969         vector<CNode*> vNodesCopy;
 970         CRITICAL_BLOCK(cs_vNodes)
 971         {
 972             vNodesCopy = vNodes;
 973             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 974                 pnode->AddRef();
 975         }
 976         BOOST_FOREACH(CNode* pnode, vNodesCopy)
 977         {
 978             if (fShutdown)
 979                 return;
 980
 981             //
 982             // Receive
 983             //
 984             if (pnode->hSocket == INVALID_SOCKET)
 985                 continue;
 986             if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
 987             {
 988                 TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
 989                 {
 990                     CDataStream& vRecv = pnode->vRecv;
 991                     unsigned int nPos = vRecv.size();
 992
 993                     if (nPos > ReceiveBufferSize()) {
 994                         if (!pnode->fDisconnect)
 995                             printf("socket recv flood control disconnect (%d bytes)\n", vRecv.size());
 996                         pnode->CloseSocketDisconnect();
 997                     }
 998                     else {
 999                         // typical socket buffer is 8K-64K
1000                         char pchBuf[0x10000];
1001                         int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
1002                         if (nBytes > 0)
1003                         {
1004                             vRecv.resize(nPos + nBytes);
1005                             memcpy(&vRecv[nPos], pchBuf, nBytes);
1006                             pnode->nLastRecv = GetTime();
1007                         }
1008                         else if (nBytes == 0)
1009                         {
1010                             // socket closed gracefully
1011                             if (!pnode->fDisconnect)
1012                                 printf("socket closed\n");
1013                             pnode->CloseSocketDisconnect();
1014                         }
1015                         else if (nBytes < 0)
1016                         {
1017                             // error
1018                             int nErr = WSAGetLastError();
1019                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
1020                             {
1021                                 if (!pnode->fDisconnect)
1022                                     printf("socket recv error %d\n", nErr);
1023                                 pnode->CloseSocketDisconnect();
1024                             }
1025                         }
1026                     }
1027                 }
1028             }
1029
1030             //
1031             // Send
1032             //
1033             if (pnode->hSocket == INVALID_SOCKET)
1034                 continue;
1035             if (FD_ISSET(pnode->hSocket, &fdsetSend))
1036             {
1037                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
1038                 {
1039                     CDataStream& vSend = pnode->vSend;
1040                     if (!vSend.empty())
1041                     {
1042                         int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT);
1043                         if (nBytes > 0)
1044                         {
1045                             vSend.erase(vSend.begin(), vSend.begin() + nBytes);
1046                             pnode->nLastSend = GetTime();
1047                         }
1048                         else if (nBytes < 0)
1049                         {
1050                             // error
1051                             int nErr = WSAGetLastError();
1052                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
1053                             {
1054                                 printf("socket send error %d\n", nErr);
1055                                 pnode->CloseSocketDisconnect();
1056                             }
1057                         }
1058                         if (vSend.size() > SendBufferSize()) {
1059                             if (!pnode->fDisconnect)
1060                                 printf("socket send flood control disconnect (%d bytes)\n", vSend.size());
1061                             pnode->CloseSocketDisconnect();
1062                         }
1063                     }
1064                 }
1065             }
1066
1067             //
1068             // Inactivity checking
1069             //
1070             if (pnode->vSend.empty())
1071                 pnode->nLastSendEmpty = GetTime();
1072             if (GetTime() - pnode->nTimeConnected > 60)
1073             {
1074                 if (pnode->nLastRecv == 0 || pnode->nLastSend == 0)
1075                 {
1076                     printf("socket no message in first 60 seconds, %d %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0);
1077                     pnode->fDisconnect = true;
1078                 }
1079                 else if (GetTime() - pnode->nLastSend > 90*60 && GetTime() - pnode->nLastSendEmpty > 90*60)
1080                 {
1081                     printf("socket not sending\n");
1082                     pnode->fDisconnect = true;
1083                 }
1084                 else if (GetTime() - pnode->nLastRecv > 90*60)
1085                 {
1086                     printf("socket inactivity timeout\n");
1087                     pnode->fDisconnect = true;
1088                 }
1089             }
1090         }
1091         CRITICAL_BLOCK(cs_vNodes)
1092         {
1093             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1094                 pnode->Release();
1095         }
1096
1097         Sleep(10);
1098     }
1099 }
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109 #ifdef USE_UPNP
1110 void ThreadMapPort(void* parg)
1111 {
1112     IMPLEMENT_RANDOMIZE_STACK(ThreadMapPort(parg));
1113     try
1114     {
1115         vnThreadsRunning[5]++;
1116         ThreadMapPort2(parg);
1117         vnThreadsRunning[5]--;
1118     }
1119     catch (std::exception& e) {
1120         vnThreadsRunning[5]--;
1121         PrintException(&e, "ThreadMapPort()");
1122     } catch (...) {
1123         vnThreadsRunning[5]--;
1124         PrintException(NULL, "ThreadMapPort()");
1125     }
1126     printf("ThreadMapPort exiting\n");
1127 }
1128
1129 void ThreadMapPort2(void* parg)
1130 {
1131     printf("ThreadMapPort started\n");
1132
1133     char port[6];
1134     sprintf(port, "%d", GetListenPort());
1135
1136     const char * multicastif = 0;
1137     const char * minissdpdpath = 0;
1138     struct UPNPDev * devlist = 0;
1139     char lanaddr[64];
1140
1141 #ifndef UPNPDISCOVER_SUCCESS
1142     /* miniupnpc 1.5 */
1143     devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0);
1144 #else
1145     /* miniupnpc 1.6 */
1146     int error = 0;
1147     devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
1148 #endif
1149
1150     struct UPNPUrls urls;
1151     struct IGDdatas data;
1152     int r;
1153
1154     r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
1155     if (r == 1)
1156     {
1157         if (!addrLocalHost.IsRoutable())
1158         {
1159             char externalIPAddress[40];
1160             r = UPNP_GetExternalIPAddress(urls.controlURL, data.first.servicetype, externalIPAddress);
1161             if(r != UPNPCOMMAND_SUCCESS)
1162                 printf("UPnP: GetExternalIPAddress() returned %d\n", r);
1163             else
1164             {
1165                 if(externalIPAddress[0])
1166                 {
1167                     printf("UPnP: ExternalIPAddress = %s\n", externalIPAddress);
1168                     CAddress addrExternalFromUPnP(externalIPAddress, 0, false, nLocalServices);
1169                     if (addrExternalFromUPnP.IsRoutable())
1170                         addrLocalHost = addrExternalFromUPnP;
1171                 }
1172                 else
1173                     printf("UPnP: GetExternalIPAddress failed.\n");
1174             }
1175         }
1176
1177         string strDesc = "Bitcoin " + FormatFullVersion();
1178 #ifndef UPNPDISCOVER_SUCCESS
1179         /* miniupnpc 1.5 */
1180         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1181                             port, port, lanaddr, strDesc.c_str(), "TCP", 0);
1182 #else
1183         /* miniupnpc 1.6 */
1184         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1185                             port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
1186 #endif
1187
1188         if(r!=UPNPCOMMAND_SUCCESS)
1189             printf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
1190                 port, port, lanaddr, r, strupnperror(r));
1191         else
1192             printf("UPnP Port Mapping successful.\n");
1193         int i = 1;
1194         loop {
1195             if (fShutdown || !fUseUPnP)
1196             {
1197                 r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port, "TCP", 0);
1198                 printf("UPNP_DeletePortMapping() returned : %d\n", r);
1199                 freeUPNPDevlist(devlist); devlist = 0;
1200                 FreeUPNPUrls(&urls);
1201                 return;
1202             }
1203             if (i % 600 == 0) // Refresh every 20 minutes
1204             {
1205 #ifndef UPNPDISCOVER_SUCCESS
1206                 /* miniupnpc 1.5 */
1207                 r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1208                                     port, port, lanaddr, strDesc.c_str(), "TCP", 0);
1209 #else
1210                 /* miniupnpc 1.6 */
1211                 r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1212                                     port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
1213 #endif
1214
1215                 if(r!=UPNPCOMMAND_SUCCESS)
1216                     printf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
1217                         port, port, lanaddr, r, strupnperror(r));
1218                 else
1219                     printf("UPnP Port Mapping successful.\n");;
1220             }
1221             Sleep(2000);
1222             i++;
1223         }
1224     } else {
1225         printf("No valid UPnP IGDs found\n");
1226         freeUPNPDevlist(devlist); devlist = 0;
1227         if (r != 0)
1228             FreeUPNPUrls(&urls);
1229         loop {
1230             if (fShutdown || !fUseUPnP)
1231                 return;
1232             Sleep(2000);
1233         }
1234     }
1235 }
1236
1237 void MapPort(bool fMapPort)
1238 {
1239     if (fUseUPnP != fMapPort)
1240     {
1241         fUseUPnP = fMapPort;
1242         WriteSetting("fUseUPnP", fUseUPnP);
1243     }
1244     if (fUseUPnP && vnThreadsRunning[5] < 1)
1245     {
1246         if (!CreateThread(ThreadMapPort, NULL))
1247             printf("Error: ThreadMapPort(ThreadMapPort) failed\n");
1248     }
1249 }
1250 #else
1251 void MapPort(bool /* unused fMapPort */)
1252 {
1253     // Intentionally left blank.
1254 }
1255 #endif
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266 static const char *strDNSSeed[] = {
1267     "bitseed.xf2.org",
1268     "dnsseed.bluematt.me",
1269     "seed.bitcoin.sipa.be",
1270     "dnsseed.bitcoin.dashjr.org",
1271 };
1272
1273 void ThreadDNSAddressSeed(void* parg)
1274 {
1275     IMPLEMENT_RANDOMIZE_STACK(ThreadDNSAddressSeed(parg));
1276     try
1277     {
1278         vnThreadsRunning[6]++;
1279         ThreadDNSAddressSeed2(parg);
1280         vnThreadsRunning[6]--;
1281     }
1282     catch (std::exception& e) {
1283         vnThreadsRunning[6]--;
1284         PrintException(&e, "ThreadDNSAddressSeed()");
1285     } catch (...) {
1286         vnThreadsRunning[6]--;
1287         throw; // support pthread_cancel()
1288     }
1289     printf("ThreadDNSAddressSeed exiting\n");
1290 }
1291
1292 void ThreadDNSAddressSeed2(void* parg)
1293 {
1294     printf("ThreadDNSAddressSeed started\n");
1295     int found = 0;
1296
1297     if (!fTestNet)
1298     {
1299         printf("Loading addresses from DNS seeds (could take a while)\n");
1300
1301         for (int seed_idx = 0; seed_idx < ARRAYLEN(strDNSSeed); seed_idx++) {
1302             vector<CAddress> vaddr;
1303             if (Lookup(strDNSSeed[seed_idx], vaddr, NODE_NETWORK, -1, true))
1304             {
1305                 CAddrDB addrDB;
1306                 addrDB.TxnBegin();
1307                 BOOST_FOREACH (CAddress& addr, vaddr)
1308                 {
1309                     if (addr.GetByte(3) != 127)
1310                     {
1311                         addr.nTime = 0;
1312                         AddAddress(addr, 0, &addrDB);
1313                         found++;
1314                     }
1315                 }
1316                 addrDB.TxnCommit();  // Save addresses (it's ok if this fails)
1317             }
1318         }
1319     }
1320
1321     printf("%d addresses found from DNS seeds\n", found);
1322 }
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335 unsigned int pnSeed[] =
1336 {
1337     0x959bd347, 0xf8de42b2, 0x73bc0518, 0xea6edc50, 0x21b00a4d, 0xc725b43d, 0xd665464d, 0x1a2a770e,
1338     0x27c93946, 0x65b2fa46, 0xb80ae255, 0x66b3b446, 0xb1877a3e, 0x6ee89e3e, 0xc3175b40, 0x2a01a83c,
1339     0x95b1363a, 0xa079ad3d, 0xe6ca801f, 0x027f4f4a, 0x34f7f03a, 0xf790f04a, 0x16ca801f, 0x2f4d5e40,
1340     0x3a4d5e40, 0xc43a322e, 0xc8159753, 0x14d4724c, 0x7919a118, 0xe0bdb34e, 0x68a16b2e, 0xff64b44d,
1341     0x6099115b, 0x9b57b05b, 0x7bd1b4ad, 0xdf95944f, 0x29d2b73d, 0xafa8db79, 0xe247ba41, 0x24078348,
1342     0xf722f03c, 0x33567ebc, 0xace64ed4, 0x984d3932, 0xb5f34e55, 0x27b7024d, 0x94579247, 0x8894042e,
1343     0x9357d34c, 0x1063c24b, 0xcaa228b1, 0xa3c5a8b2, 0x5dc64857, 0xa2c23643, 0xa8369a54, 0x31203077,
1344     0x00707c5c, 0x09fc0b3a, 0x272e9e2e, 0xf80f043e, 0x9449ca3e, 0x5512c33e, 0xd106b555, 0xe8024157,
1345     0xe288ec29, 0xc79c5461, 0xafb63932, 0xdb02ab4b, 0x0e512777, 0x8a145a4c, 0xb201ff4f, 0x5e09314b,
1346     0xcd9bfbcd, 0x1c023765, 0x4394e75c, 0xa728bd4d, 0x65331552, 0xa98420b1, 0x89ecf559, 0x6e80801f,
1347     0xf404f118, 0xefd62b51, 0x05918346, 0x9b186d5f, 0xacabab46, 0xf912e255, 0xc188ea62, 0xcc55734e,
1348     0xc668064d, 0xd77a4558, 0x46201c55, 0xf17dfc80, 0xf7142f2e, 0x87bfb718, 0x8aa54fb2, 0xc451d518,
1349     0xc4ae8831, 0x8dd44d55, 0x5bbd206c, 0x64536b5d, 0x5c667e60, 0x3b064242, 0xfe963a42, 0xa28e6dc8,
1350     0xe8a9604a, 0xc989464e, 0xd124a659, 0x50065140, 0xa44dfe5e, 0x1079e655, 0x3fb986d5, 0x47895b18,
1351     0x7d3ce4ad, 0x4561ba50, 0x296eec62, 0x255b41ad, 0xaed35ec9, 0x55556f12, 0xc7d3154d, 0x3297b65d,
1352     0x8930121f, 0xabf42e4e, 0x4a29e044, 0x1212685d, 0x676c1e40, 0xce009744, 0x383a8948, 0xa2dbd0ad,
1353     0xecc2564d, 0x07dbc252, 0x887ee24b, 0x5171644c, 0x6bb798c1, 0x847f495d, 0x4cbb7145, 0x3bb81c32,
1354     0x45eb262e, 0xc8015a4e, 0x250a361b, 0xf694f946, 0xd64a183e, 0xd4f1dd59, 0x8f20ffd4, 0x51d9e55c,
1355     0x09521763, 0x5e02002e, 0x32c8074d, 0xe685762e, 0x8290b0bc, 0x762a922e, 0xfc5ee754, 0x83a24829,
1356     0x775b224d, 0x6295bb4d, 0x38ec0555, 0xbffbba50, 0xe5560260, 0x86b16a7c, 0xd372234e, 0x49a3c24b,
1357     0x2f6a171f, 0x4d75ed60, 0xae94115b, 0xcb543744, 0x63080c59, 0x3f9c724c, 0xc977ce18, 0x532efb18,
1358     0x69dc3b2e, 0x5f94d929, 0x1732bb4d, 0x9c814b4d, 0xe6b3762e, 0xc024f662, 0x8face35b, 0x6b5b044d,
1359     0x798c7b57, 0x79a6b44c, 0x067d3057, 0xf9e94e5f, 0x91cbe15b, 0x71405eb2, 0x2662234e, 0xcbcc4a6d,
1360     0xbf69d54b, 0xa79b4e55, 0xec6d3e51, 0x7c0b3c02, 0x60f83653, 0x24c1e15c, 0x1110b62e, 0x10350f59,
1361     0xa56f1d55, 0x3509e7a9, 0xeb128354, 0x14268e2e, 0x934e28bc, 0x8e32692e, 0x8331a21f, 0x3e633932,
1362     0xc812b12e, 0xc684bf2e, 0x80112d2e, 0xe0ddc96c, 0xc630ca4a, 0x5c09b3b2, 0x0b580518, 0xc8e9d54b,
1363     0xd169aa43, 0x17d0d655, 0x1d029963, 0x7ff87559, 0xcb701f1f, 0x6fa3e85d, 0xe45e9a54, 0xf05d1802,
1364     0x44d03b2e, 0x837b692e, 0xccd4354e, 0x3d6da13c, 0x3423084d, 0xf707c34a, 0x55f6db3a, 0xad26e442,
1365     0x6233a21f, 0x09e80e59, 0x8caeb54d, 0xbe870941, 0xb407d20e, 0x20b51018, 0x56fb152e, 0x460d2a4e,
1366     0xbb9a2946, 0x560eb12e, 0xed83dd29, 0xd6724f53, 0xa50aafb8, 0x451346d9, 0x88348e2e, 0x7312fead,
1367     0x8ecaf96f, 0x1bda4e5f, 0xf1671e40, 0x3c8c3e3b, 0x4716324d, 0xdde24ede, 0xf98cd17d, 0xa91d4644,
1368     0x28124eb2, 0x147d5129, 0xd022042e, 0x61733d3b, 0xad0d5e02, 0x8ce2932e, 0xe5c18502, 0x549c1e32,
1369     0x9685801f, 0x86e217ad, 0xd948214b, 0x4110f462, 0x3a2e894e, 0xbd35492e, 0x87e0d558, 0x64b8ef7d,
1370     0x7c3eb962, 0x72a84b3e, 0x7cd667c9, 0x28370a2e, 0x4bc60e7b, 0x6fc1ec60, 0x14a6983f, 0x86739a4b,
1371     0x46954e5f, 0x32e2e15c, 0x2e9326cf, 0xe5801c5e, 0x379607b2, 0x32151145, 0xf0e39744, 0xacb54c55,
1372     0xa37dfb60, 0x83b55cc9, 0x388f7ca5, 0x15034f5f, 0x3e94965b, 0x68e0ffad, 0x35280f59, 0x8fe190cf,
1373     0x7c6ba5b2, 0xa5e9db43, 0x4ee1fc60, 0xd9d94e5f, 0x04040677, 0x0ea9b35e, 0x5961f14f, 0x67fda063,
1374     0xa48a5a31, 0xc6524e55, 0x283d325e, 0x3f37515f, 0x96b94b3e, 0xacce620e, 0x6481cc5b, 0xa4a06d4b,
1375     0x9e95d2d9, 0xe40c03d5, 0xc2f4514b, 0xb79aad44, 0xf64be843, 0xb2064070, 0xfca00455, 0x429dfa4e,
1376     0x2323f173, 0xeda4185e, 0xabd5227d, 0x9efd4d58, 0xb1104758, 0x4811e955, 0xbd9ab355, 0xe921f44b,
1377     0x9f166dce, 0x09e279b2, 0xe0c9ac7b, 0x7901a5ad, 0xa145d4b0, 0x79104671, 0xec31e35a, 0x4fe0b555,
1378     0xc7d9cbad, 0xad057f55, 0xe94cc759, 0x7fe0b043, 0xe4529f2e, 0x0d4dd4b2, 0x9f11a54d, 0x031e2e4e,
1379     0xe6014f5f, 0x11d1ca6c, 0x26bd7f61, 0xeb86854f, 0x4d347b57, 0x116bbe2e, 0xdba7234e, 0x7bcbfd2e,
1380     0x174dd4b2, 0x6686762e, 0xb089ba50, 0xc6258246, 0x087e767b, 0xc4a8cb4a, 0x595dba50, 0x7f0ae502,
1381     0x7b1dbd5a, 0xa0603492, 0x57d1af4b, 0x9e21ffd4, 0x6393064d, 0x7407376e, 0xe484762e, 0x122a4e53,
1382     0x4a37aa43, 0x3888a6be, 0xee77864e, 0x039c8dd5, 0x688d89af, 0x0e988f62, 0x08218246, 0xfc2f8246,
1383     0xd1d97040, 0xd64cd4b2, 0x5ae4a6b8, 0x7d0de9bc, 0x8d304d61, 0x06c5c672, 0xa4c8bd4d, 0xe0fd373b,
1384     0x575ebe4d, 0x72d26277, 0x55570f55, 0x77b154d9, 0xe214293a, 0xfc740f4b, 0xfe3f6a57, 0xa9c55f02,
1385     0xae4054db, 0x2394d918, 0xb511b24a, 0xb8741ab2, 0x0758e65e, 0xc7b5795b, 0xb0a30a4c, 0xaf7f170c,
1386     0xf3b4762e, 0x8179576d, 0x738a1581, 0x4b95b64c, 0x9829b618, 0x1bea932e, 0x7bdeaa4b, 0xcb5e0281,
1387     0x65618f54, 0x0658474b, 0x27066acf, 0x40556d65, 0x7d204d53, 0xf28bc244, 0xdce23455, 0xadc0ff54,
1388     0x3863c948, 0xcee34e5f, 0xdeb85e02, 0x2ed17a61, 0x6a7b094d, 0x7f0cfc40, 0x59603f54, 0x3220afbc,
1389     0xb5dfd962, 0x125d21c0, 0x13f8d243, 0xacfefb4e, 0x86c2c147, 0x3d8bbd59, 0xbd02a21f, 0x2593042e,
1390     0xc6a17a7c, 0x28925861, 0xb487ed44, 0xb5f4fd6d, 0x90c28a45, 0x5a14f74d, 0x43d71b4c, 0x728ebb5d,
1391     0x885bf950, 0x08134dd0, 0x38ec046e, 0xc575684b, 0x50082d2e, 0xa2f47757, 0x270f86ae, 0xf3ff6462,
1392     0x10ed3f4e, 0x4b58d462, 0xe01ce23e, 0x8c5b092e, 0x63e52f4e, 0x22c1e85d, 0xa908f54e, 0x8591624f,
1393     0x2c0fb94e, 0xa280ba3c, 0xb6f41b4c, 0x24f9aa47, 0x27201647, 0x3a3ea6dc, 0xa14fc3be, 0x3c34bdd5,
1394     0x5b8d4f5b, 0xaadeaf4b, 0xc71cab50, 0x15697a4c, 0x9a1a734c, 0x2a037d81, 0x2590bd59, 0x48ec2741,
1395     0x53489c5b, 0x7f00314b, 0x2170d362, 0xf2e92542, 0x42c10b44, 0x98f0f118, 0x883a3456, 0x099a932e,
1396     0xea38f7bc, 0x644e9247, 0xbb61b62e, 0x30e0863d, 0x5f51be54, 0x207215c7, 0x5f306c45, 0xaa7f3932,
1397     0x98da7d45, 0x4e339b59, 0x2e411581, 0xa808f618, 0xad2c0c59, 0x54476741, 0x09e99fd1, 0x5db8f752,
1398     0xc16df8bd, 0x1dd4b44f, 0x106edf2e, 0x9e15c180, 0x2ad6b56f, 0x633a5332, 0xff33787c, 0x077cb545,
1399     0x6610be6d, 0x75aad2c4, 0x72fb4d5b, 0xe81e0f59, 0x576f6332, 0x47333373, 0x351ed783, 0x2d90fb50,
1400     0x8d5e0f6c, 0x5b27a552, 0xdb293ebb, 0xe55ef950, 0x4b133ad8, 0x75df975a, 0x7b6a8740, 0xa899464b,
1401     0xfab15161, 0x10f8b64d, 0xd055ea4d, 0xee8e146b, 0x4b14afb8, 0x4bc1c44a, 0x9b961dcc, 0xd111ff43,
1402     0xfca0b745, 0xc800e412, 0x0afad9d1, 0xf751c350, 0xf9f0cccf, 0xa290a545, 0x8ef13763, 0x7ec70d59,
1403     0x2b066acf, 0x65496c45, 0xade02c1b, 0xae6eb077, 0x92c1e65b, 0xc064e6a9, 0xc649e56d, 0x5287a243,
1404     0x36de4f5b, 0x5b1df6ad, 0x65c39a59, 0xdba805b2, 0x20067aa8, 0x6457e56d, 0x3cee26cf, 0xfd3ff26d,
1405     0x04f86d4a, 0x06b8e048, 0xa93bcd5c, 0x91135852, 0xbe90a643, 0x8fa0094d, 0x06d8215f, 0x2677094d,
1406     0xd735685c, 0x164a00c9, 0x5209ac5f, 0xa9564c5c, 0x3b504f5f, 0xcc826bd0, 0x4615042e, 0x5fe13b4a,
1407     0x8c81b86d, 0x879ab68c, 0x1de564b8, 0x434487d8, 0x2dcb1b63, 0x82ab524a, 0xb0676abb, 0xa13d9c62,
1408     0xdbb5b86d, 0x5b7f4b59, 0xaddfb44d, 0xad773532, 0x3997054c, 0x72cebd89, 0xb194544c, 0xc5b8046e,
1409     0x6e1adeb2, 0xaa5abb51, 0xefb54b44, 0x15efc54f, 0xe9f1bc4d, 0x5f401b6c, 0x97f018ad, 0xc82f9252,
1410     0x2cdc762e, 0x8e52e56d, 0x1827175e, 0x9b7d7d80, 0xb2ad6845, 0x51065140, 0x71180a18, 0x5b27006c,
1411     0x0621e255, 0x721cbe58, 0x670c0cb8, 0xf8bd715d, 0xe0bdc5d9, 0xed843501, 0x4b84554d, 0x7f1a18bc,
1412     0x53bcaf47, 0x5729d35f, 0xf0dda246, 0x22382bd0, 0x4d641fb0, 0x316afcde, 0x50a22f1f, 0x73608046,
1413     0xc461d84a, 0xb2dbe247,
1414 };
1415
1416
1417
1418 void ThreadOpenConnections(void* parg)
1419 {
1420     IMPLEMENT_RANDOMIZE_STACK(ThreadOpenConnections(parg));
1421     try
1422     {
1423         vnThreadsRunning[1]++;
1424         ThreadOpenConnections2(parg);
1425         vnThreadsRunning[1]--;
1426     }
1427     catch (std::exception& e) {
1428         vnThreadsRunning[1]--;
1429         PrintException(&e, "ThreadOpenConnections()");
1430     } catch (...) {
1431         vnThreadsRunning[1]--;
1432         PrintException(NULL, "ThreadOpenConnections()");
1433     }
1434     printf("ThreadOpenConnections exiting\n");
1435 }
1436
1437 void ThreadOpenConnections2(void* parg)
1438 {
1439     printf("ThreadOpenConnections started\n");
1440
1441     // Connect to specific addresses
1442     if (mapArgs.count("-connect"))
1443     {
1444         for (int64 nLoop = 0;; nLoop++)
1445         {
1446             BOOST_FOREACH(string strAddr, mapMultiArgs["-connect"])
1447             {
1448                 CAddress addr(strAddr, fAllowDNS);
1449                 if (addr.IsValid())
1450                     OpenNetworkConnection(addr);
1451                 for (int i = 0; i < 10 && i < nLoop; i++)
1452                 {
1453                     Sleep(500);
1454                     if (fShutdown)
1455                         return;
1456                 }
1457             }
1458         }
1459     }
1460
1461     // Connect to manually added nodes first
1462     if (mapArgs.count("-addnode"))
1463     {
1464         BOOST_FOREACH(string strAddr, mapMultiArgs["-addnode"])
1465         {
1466             CAddress addr(strAddr, fAllowDNS);
1467             if (addr.IsValid())
1468             {
1469                 OpenNetworkConnection(addr);
1470                 Sleep(500);
1471                 if (fShutdown)
1472                     return;
1473             }
1474         }
1475     }
1476
1477     // Initiate network connections
1478     int64 nStart = GetTime();
1479     loop
1480     {
1481         // Limit outbound connections
1482         vnThreadsRunning[1]--;
1483         Sleep(500);
1484         loop
1485         {
1486             int nOutbound = 0;
1487             CRITICAL_BLOCK(cs_vNodes)
1488                 BOOST_FOREACH(CNode* pnode, vNodes)
1489                     if (!pnode->fInbound)
1490                         nOutbound++;
1491             int nMaxOutboundConnections = MAX_OUTBOUND_CONNECTIONS;
1492             nMaxOutboundConnections = min(nMaxOutboundConnections, (int)GetArg("-maxconnections", 125));
1493             if (nOutbound < nMaxOutboundConnections)
1494                 break;
1495             Sleep(2000);
1496             if (fShutdown)
1497                 return;
1498         }
1499         vnThreadsRunning[1]++;
1500         if (fShutdown)
1501             return;
1502
1503         bool fAddSeeds = false;
1504
1505         CRITICAL_BLOCK(cs_mapAddresses)
1506         {
1507             // Add seed nodes if IRC isn't working
1508             bool fTOR = (fUseProxy && addrProxy.port == htons(9050));
1509             if (mapAddresses.empty() && (GetTime() - nStart > 60 || fUseProxy) && !fTestNet)
1510                 fAddSeeds = true;
1511         }
1512
1513         if (fAddSeeds)
1514         {
1515             for (int i = 0; i < ARRAYLEN(pnSeed); i++)
1516             {
1517                 // It'll only connect to one or two seed nodes because once it connects,
1518                 // it'll get a pile of addresses with newer timestamps.
1519                 // Seed nodes are given a random 'last seen time' of between one and two
1520                 // weeks ago.
1521                 const int64 nOneWeek = 7*24*60*60;
1522                 CAddress addr;
1523                 addr.ip = pnSeed[i];
1524                 addr.nTime = GetTime()-GetRand(nOneWeek)-nOneWeek;
1525                 AddAddress(addr);
1526             }
1527         }
1528
1529         //
1530         // Choose an address to connect to based on most recently seen
1531         //
1532         CAddress addrConnect;
1533         int64 nBest = INT64_MIN;
1534
1535         // Only connect to one address per a.b.?.? range.
1536         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
1537         set<unsigned int> setConnected;
1538         CRITICAL_BLOCK(cs_vNodes)
1539             BOOST_FOREACH(CNode* pnode, vNodes)
1540                 setConnected.insert(pnode->addr.ip & 0x0000ffff);
1541
1542         int64 nANow = GetAdjustedTime();
1543
1544         CRITICAL_BLOCK(cs_mapAddresses)
1545         {
1546             BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
1547             {
1548                 const CAddress& addr = item.second;
1549                 if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.ip & 0x0000ffff))
1550                     continue;
1551                 int64 nSinceLastSeen = nANow - addr.nTime;
1552                 int64 nSinceLastTry = nANow - addr.nLastTry;
1553
1554                 // Randomize the order in a deterministic way, putting the standard port first
1555                 int64 nRandomizer = (uint64)(nStart * 4951 + addr.nLastTry * 9567851 + addr.ip * 7789) % (2 * 60 * 60);
1556                 if (addr.port != htons(GetDefaultPort()))
1557                     nRandomizer += 2 * 60 * 60;
1558
1559                 // Last seen  Base retry frequency
1560                 //   <1 hour   10 min
1561                 //    1 hour    1 hour
1562                 //    4 hours   2 hours
1563                 //   24 hours   5 hours
1564                 //   48 hours   7 hours
1565                 //    7 days   13 hours
1566                 //   30 days   27 hours
1567                 //   90 days   46 hours
1568                 //  365 days   93 hours
1569                 int64 nDelay = (int64)(3600.0 * sqrt(fabs((double)nSinceLastSeen) / 3600.0) + nRandomizer);
1570
1571                 // Fast reconnect for one hour after last seen
1572                 if (nSinceLastSeen < 60 * 60)
1573                     nDelay = 10 * 60;
1574
1575                 // Limit retry frequency
1576                 if (nSinceLastTry < nDelay)
1577                     continue;
1578
1579                 // If we have IRC, we'll be notified when they first come online,
1580                 // and again every 24 hours by the refresh broadcast.
1581                 if (nGotIRCAddresses > 0 && vNodes.size() >= 2 && nSinceLastSeen > 24 * 60 * 60)
1582                     continue;
1583
1584                 // Only try the old stuff if we don't have enough connections
1585                 if (vNodes.size() >= 8 && nSinceLastSeen > 24 * 60 * 60)
1586                     continue;
1587
1588                 // If multiple addresses are ready, prioritize by time since
1589                 // last seen and time since last tried.
1590                 int64 nScore = min(nSinceLastTry, (int64)24 * 60 * 60) - nSinceLastSeen - nRandomizer;
1591                 if (nScore > nBest)
1592                 {
1593                     nBest = nScore;
1594                     addrConnect = addr;
1595                 }
1596             }
1597         }
1598
1599         if (addrConnect.IsValid())
1600             OpenNetworkConnection(addrConnect);
1601     }
1602 }
1603
1604 bool OpenNetworkConnection(const CAddress& addrConnect)
1605 {
1606     //
1607     // Initiate outbound network connection
1608     //
1609     if (fShutdown)
1610         return false;
1611     if (addrConnect.ip == addrLocalHost.ip || !addrConnect.IsIPv4() ||
1612         FindNode(addrConnect.ip) || CNode::IsBanned(addrConnect.ip))
1613         return false;
1614
1615     vnThreadsRunning[1]--;
1616     CNode* pnode = ConnectNode(addrConnect);
1617     vnThreadsRunning[1]++;
1618     if (fShutdown)
1619         return false;
1620     if (!pnode)
1621         return false;
1622     pnode->fNetworkNode = true;
1623
1624     return true;
1625 }
1626
1627
1628
1629
1630
1631
1632
1633
1634 void ThreadMessageHandler(void* parg)
1635 {
1636     IMPLEMENT_RANDOMIZE_STACK(ThreadMessageHandler(parg));
1637     try
1638     {
1639         vnThreadsRunning[2]++;
1640         ThreadMessageHandler2(parg);
1641         vnThreadsRunning[2]--;
1642     }
1643     catch (std::exception& e) {
1644         vnThreadsRunning[2]--;
1645         PrintException(&e, "ThreadMessageHandler()");
1646     } catch (...) {
1647         vnThreadsRunning[2]--;
1648         PrintException(NULL, "ThreadMessageHandler()");
1649     }
1650     printf("ThreadMessageHandler exiting\n");
1651 }
1652
1653 void ThreadMessageHandler2(void* parg)
1654 {
1655     printf("ThreadMessageHandler started\n");
1656     SetThreadPriority(THREAD_PRIORITY_BELOW_NORMAL);
1657     while (!fShutdown)
1658     {
1659         vector<CNode*> vNodesCopy;
1660         CRITICAL_BLOCK(cs_vNodes)
1661         {
1662             vNodesCopy = vNodes;
1663             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1664                 pnode->AddRef();
1665         }
1666
1667         // Poll the connected nodes for messages
1668         CNode* pnodeTrickle = NULL;
1669         if (!vNodesCopy.empty())
1670             pnodeTrickle = vNodesCopy[GetRand(vNodesCopy.size())];
1671         BOOST_FOREACH(CNode* pnode, vNodesCopy)
1672         {
1673             // Receive messages
1674             TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
1675                 ProcessMessages(pnode);
1676             if (fShutdown)
1677                 return;
1678
1679             // Send messages
1680             TRY_CRITICAL_BLOCK(pnode->cs_vSend)
1681                 SendMessages(pnode, pnode == pnodeTrickle);
1682             if (fShutdown)
1683                 return;
1684         }
1685
1686         CRITICAL_BLOCK(cs_vNodes)
1687         {
1688             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1689                 pnode->Release();
1690         }
1691
1692         // Wait and allow messages to bunch up.
1693         // Reduce vnThreadsRunning so StopNode has permission to exit while
1694         // we're sleeping, but we must always check fShutdown after doing this.
1695         vnThreadsRunning[2]--;
1696         Sleep(100);
1697         if (fRequestShutdown)
1698             Shutdown(NULL);
1699         vnThreadsRunning[2]++;
1700         if (fShutdown)
1701             return;
1702     }
1703 }
1704
1705
1706
1707
1708
1709
1710 bool BindListenPort(string& strError)
1711 {
1712     strError = "";
1713     int nOne = 1;
1714     addrLocalHost.port = htons(GetListenPort());
1715
1716 #ifdef WIN32
1717     // Initialize Windows Sockets
1718     WSADATA wsadata;
1719     int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
1720     if (ret != NO_ERROR)
1721     {
1722         strError = strprintf("Error: TCP/IP socket library failed to start (WSAStartup returned error %d)", ret);
1723         printf("%s\n", strError.c_str());
1724         return false;
1725     }
1726 #endif
1727
1728     // Create socket for listening for incoming connections
1729     hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1730     if (hListenSocket == INVALID_SOCKET)
1731     {
1732         strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError());
1733         printf("%s\n", strError.c_str());
1734         return false;
1735     }
1736
1737 #ifdef SO_NOSIGPIPE
1738     // Different way of disabling SIGPIPE on BSD
1739     setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int));
1740 #endif
1741
1742 #ifndef WIN32
1743     // Allow binding if the port is still in TIME_WAIT state after
1744     // the program was closed and restarted.  Not an issue on windows.
1745     setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
1746 #endif
1747
1748 #ifdef WIN32
1749     // Set to nonblocking, incoming connections will also inherit this
1750     if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR)
1751 #else
1752     if (fcntl(hListenSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
1753 #endif
1754     {
1755         strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %d)", WSAGetLastError());
1756         printf("%s\n", strError.c_str());
1757         return false;
1758     }
1759
1760     // The sockaddr_in structure specifies the address family,
1761     // IP address, and port for the socket that is being bound
1762     struct sockaddr_in sockaddr;
1763     memset(&sockaddr, 0, sizeof(sockaddr));
1764     sockaddr.sin_family = AF_INET;
1765     sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer
1766     sockaddr.sin_port = htons(GetListenPort());
1767     if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
1768     {
1769         int nErr = WSAGetLastError();
1770         if (nErr == WSAEADDRINUSE)
1771             strError = strprintf(_("Unable to bind to port %d on this computer.  Bitcoin is probably already running."), ntohs(sockaddr.sin_port));
1772         else
1773             strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr);
1774         printf("%s\n", strError.c_str());
1775         return false;
1776     }
1777     printf("Bound to port %d\n", ntohs(sockaddr.sin_port));
1778
1779     // Listen for incoming connections
1780     if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
1781     {
1782         strError = strprintf("Error: Listening for incoming connections failed (listen returned error %d)", WSAGetLastError());
1783         printf("%s\n", strError.c_str());
1784         return false;
1785     }
1786
1787     return true;
1788 }
1789
1790 void StartNode(void* parg)
1791 {
1792     if (pnodeLocalHost == NULL)
1793         pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress("127.0.0.1", 0, false, nLocalServices));
1794
1795 #ifdef WIN32
1796     // Get local host ip
1797     char pszHostName[1000] = "";
1798     if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
1799     {
1800         vector<CAddress> vaddr;
1801         if (Lookup(pszHostName, vaddr, nLocalServices, -1, true))
1802             BOOST_FOREACH (const CAddress &addr, vaddr)
1803                 if (addr.GetByte(3) != 127)
1804                 {
1805                     addrLocalHost = addr;
1806                     break;
1807                 }
1808     }
1809 #else
1810     // Get local host ip
1811     struct ifaddrs* myaddrs;
1812     if (getifaddrs(&myaddrs) == 0)
1813     {
1814         for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
1815         {
1816             if (ifa->ifa_addr == NULL) continue;
1817             if ((ifa->ifa_flags & IFF_UP) == 0) continue;
1818             if (strcmp(ifa->ifa_name, "lo") == 0) continue;
1819             if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
1820             char pszIP[100];
1821             if (ifa->ifa_addr->sa_family == AF_INET)
1822             {
1823                 struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
1824                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL)
1825                     printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP);
1826
1827                 // Take the first IP that isn't loopback 127.x.x.x
1828                 CAddress addr(*(unsigned int*)&s4->sin_addr, GetListenPort(), nLocalServices);
1829                 if (addr.IsValid() && addr.GetByte(3) != 127)
1830                 {
1831                     addrLocalHost = addr;
1832                     break;
1833                 }
1834             }
1835             else if (ifa->ifa_addr->sa_family == AF_INET6)
1836             {
1837                 struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
1838                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL)
1839                     printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP);
1840             }
1841         }
1842         freeifaddrs(myaddrs);
1843     }
1844 #endif
1845     printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1846
1847     if (fUseProxy || mapArgs.count("-connect") || fNoListen)
1848     {
1849         // Proxies can't take incoming connections
1850         addrLocalHost.ip = CAddress("0.0.0.0").ip;
1851         printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1852     }
1853     else
1854     {
1855         CreateThread(ThreadGetMyExternalIP, NULL);
1856     }
1857
1858     //
1859     // Start threads
1860     //
1861
1862     if (GetBoolArg("-nodnsseed"))
1863         printf("DNS seeding disabled\n");
1864     else
1865         if (!CreateThread(ThreadDNSAddressSeed, NULL))
1866             printf("Error: CreateThread(ThreadDNSAddressSeed) failed\n");
1867
1868     // Map ports with UPnP
1869     if (fHaveUPnP)
1870         MapPort(fUseUPnP);
1871
1872     // Get addresses from IRC and advertise ours
1873     if (!CreateThread(ThreadIRCSeed, NULL))
1874         printf("Error: CreateThread(ThreadIRCSeed) failed\n");
1875
1876     // Send and receive from sockets, accept connections
1877     if (!CreateThread(ThreadSocketHandler, NULL))
1878         printf("Error: CreateThread(ThreadSocketHandler) failed\n");
1879
1880     // Initiate outbound connections
1881     if (!CreateThread(ThreadOpenConnections, NULL))
1882         printf("Error: CreateThread(ThreadOpenConnections) failed\n");
1883
1884     // Process messages
1885     if (!CreateThread(ThreadMessageHandler, NULL))
1886         printf("Error: CreateThread(ThreadMessageHandler) failed\n");
1887
1888     // Generate coins in the background
1889     GenerateBitcoins(fGenerateBitcoins, pwalletMain);
1890 }
1891
1892 bool StopNode()
1893 {
1894     printf("StopNode()\n");
1895     fShutdown = true;
1896     nTransactionsUpdated++;
1897     int64 nStart = GetTime();
1898     while (vnThreadsRunning[0] > 0 || vnThreadsRunning[2] > 0 || vnThreadsRunning[3] > 0 || vnThreadsRunning[4] > 0
1899 #ifdef USE_UPNP
1900         || vnThreadsRunning[5] > 0
1901 #endif
1902     )
1903     {
1904         if (GetTime() - nStart > 20)
1905             break;
1906         Sleep(20);
1907     }
1908     if (vnThreadsRunning[0] > 0) printf("ThreadSocketHandler still running\n");
1909     if (vnThreadsRunning[1] > 0) printf("ThreadOpenConnections still running\n");
1910     if (vnThreadsRunning[2] > 0) printf("ThreadMessageHandler still running\n");
1911     if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n");
1912     if (vnThreadsRunning[4] > 0) printf("ThreadRPCServer still running\n");
1913     if (fHaveUPnP && vnThreadsRunning[5] > 0) printf("ThreadMapPort still running\n");
1914     if (vnThreadsRunning[6] > 0) printf("ThreadDNSAddressSeed still running\n");
1915     while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
1916         Sleep(20);
1917     Sleep(50);
1918
1919     return true;
1920 }
1921
1922 class CNetCleanup
1923 {
1924 public:
1925     CNetCleanup()
1926     {
1927     }
1928     ~CNetCleanup()
1929     {
1930         // Close sockets
1931         BOOST_FOREACH(CNode* pnode, vNodes)
1932             if (pnode->hSocket != INVALID_SOCKET)
1933                 closesocket(pnode->hSocket);
1934         if (hListenSocket != INVALID_SOCKET)
1935             if (closesocket(hListenSocket) == SOCKET_ERROR)
1936                 printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
1937
1938 #ifdef WIN32
1939         // Shutdown Windows Sockets
1940         WSACleanup();
1941 #endif
1942     }
1943 }
1944 instance_of_cnetcleanup;