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