src/net.cpp

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2011 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "headers.h"
   7 #include "irc.h"
   8 #include "db.h"
   9 #include "net.h"
  10 #include "init.h"
  11 #include "strlcpy.h"
  12
  13 #ifdef 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     CRITICAL_BLOCK(cs_mapAddresses)
 500     {
 501         // Only if it's been published already
 502         map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
 503         if (it != mapAddresses.end())
 504         {
 505             CAddress& addrFound = (*it).second;
 506             int64 nUpdateInterval = 20 * 60;
 507             if (addrFound.nTime < GetAdjustedTime() - nUpdateInterval)
 508             {
 509                 // Periodically update most recently seen time
 510                 addrFound.nTime = GetAdjustedTime();
 511                 CAddrDB addrdb;
 512                 addrdb.WriteAddress(addrFound);
 513             }
 514         }
 515     }
 516 }
 517
 518
 519
 520
 521
 522 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1)
 523 {
 524     // If the dialog might get closed before the reply comes back,
 525     // call this in the destructor so it doesn't get called after it's deleted.
 526     CRITICAL_BLOCK(cs_vNodes)
 527     {
 528         BOOST_FOREACH(CNode* pnode, vNodes)
 529         {
 530             CRITICAL_BLOCK(pnode->cs_mapRequests)
 531             {
 532                 for (map<uint256, CRequestTracker>::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();)
 533                 {
 534                     CRequestTracker& tracker = (*mi).second;
 535                     if (tracker.fn == fn && tracker.param1 == param1)
 536                         pnode->mapRequests.erase(mi++);
 537                     else
 538                         mi++;
 539                 }
 540             }
 541         }
 542     }
 543 }
 544
 545
 546
 547
 548
 549
 550
 551 //
 552 // Subscription methods for the broadcast and subscription system.
 553 // Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT.
 554 //
 555 // The subscription system uses a meet-in-the-middle strategy.
 556 // With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers
 557 // subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through.
 558 //
 559
 560 bool AnySubscribed(unsigned int nChannel)
 561 {
 562     if (pnodeLocalHost->IsSubscribed(nChannel))
 563         return true;
 564     CRITICAL_BLOCK(cs_vNodes)
 565         BOOST_FOREACH(CNode* pnode, vNodes)
 566             if (pnode->IsSubscribed(nChannel))
 567                 return true;
 568     return false;
 569 }
 570
 571 bool CNode::IsSubscribed(unsigned int nChannel)
 572 {
 573     if (nChannel >= vfSubscribe.size())
 574         return false;
 575     return vfSubscribe[nChannel];
 576 }
 577
 578 void CNode::Subscribe(unsigned int nChannel, unsigned int nHops)
 579 {
 580     if (nChannel >= vfSubscribe.size())
 581         return;
 582
 583     if (!AnySubscribed(nChannel))
 584     {
 585         // Relay subscribe
 586         CRITICAL_BLOCK(cs_vNodes)
 587             BOOST_FOREACH(CNode* pnode, vNodes)
 588                 if (pnode != this)
 589                     pnode->PushMessage("subscribe", nChannel, nHops);
 590     }
 591
 592     vfSubscribe[nChannel] = true;
 593 }
 594
 595 void CNode::CancelSubscribe(unsigned int nChannel)
 596 {
 597     if (nChannel >= vfSubscribe.size())
 598         return;
 599
 600     // Prevent from relaying cancel if wasn't subscribed
 601     if (!vfSubscribe[nChannel])
 602         return;
 603     vfSubscribe[nChannel] = false;
 604
 605     if (!AnySubscribed(nChannel))
 606     {
 607         // Relay subscription cancel
 608         CRITICAL_BLOCK(cs_vNodes)
 609             BOOST_FOREACH(CNode* pnode, vNodes)
 610                 if (pnode != this)
 611                     pnode->PushMessage("sub-cancel", nChannel);
 612     }
 613 }
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623 CNode* FindNode(unsigned int ip)
 624 {
 625     CRITICAL_BLOCK(cs_vNodes)
 626     {
 627         BOOST_FOREACH(CNode* pnode, vNodes)
 628             if (pnode->addr.ip == ip)
 629                 return (pnode);
 630     }
 631     return NULL;
 632 }
 633
 634 CNode* FindNode(CAddress addr)
 635 {
 636     CRITICAL_BLOCK(cs_vNodes)
 637     {
 638         BOOST_FOREACH(CNode* pnode, vNodes)
 639             if (pnode->addr == addr)
 640                 return (pnode);
 641     }
 642     return NULL;
 643 }
 644
 645 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout)
 646 {
 647     if (addrConnect.ip == addrLocalHost.ip)
 648         return NULL;
 649
 650     // Look for an existing connection
 651     CNode* pnode = FindNode(addrConnect.ip);
 652     if (pnode)
 653     {
 654         if (nTimeout != 0)
 655             pnode->AddRef(nTimeout);
 656         else
 657             pnode->AddRef();
 658         return pnode;
 659     }
 660
 661     /// debug print
 662     printf("trying connection %s lastseen=%.1fhrs lasttry=%.1fhrs\n",
 663         addrConnect.ToString().c_str(),
 664         (double)(addrConnect.nTime - GetAdjustedTime())/3600.0,
 665         (double)(addrConnect.nLastTry - GetAdjustedTime())/3600.0);
 666
 667     CRITICAL_BLOCK(cs_mapAddresses)
 668         mapAddresses[addrConnect.GetKey()].nLastTry = GetAdjustedTime();
 669
 670     // Connect
 671     SOCKET hSocket;
 672     if (ConnectSocket(addrConnect, hSocket))
 673     {
 674         /// debug print
 675         printf("connected %s\n", addrConnect.ToString().c_str());
 676
 677         // Set to nonblocking
 678 #ifdef WIN32
 679         u_long nOne = 1;
 680         if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR)
 681             printf("ConnectSocket() : ioctlsocket nonblocking setting failed, error %d\n", WSAGetLastError());
 682 #else
 683         if (fcntl(hSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
 684             printf("ConnectSocket() : fcntl nonblocking setting failed, error %d\n", errno);
 685 #endif
 686
 687         // Add node
 688         CNode* pnode = new CNode(hSocket, addrConnect, false);
 689         if (nTimeout != 0)
 690             pnode->AddRef(nTimeout);
 691         else
 692             pnode->AddRef();
 693         CRITICAL_BLOCK(cs_vNodes)
 694             vNodes.push_back(pnode);
 695
 696         pnode->nTimeConnected = GetTime();
 697         return pnode;
 698     }
 699     else
 700     {
 701         return NULL;
 702     }
 703 }
 704
 705 void CNode::CloseSocketDisconnect()
 706 {
 707     fDisconnect = true;
 708     if (hSocket != INVALID_SOCKET)
 709     {
 710         if (fDebug)
 711             printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
 712         printf("disconnecting node %s\n", addr.ToString().c_str());
 713         closesocket(hSocket);
 714         hSocket = INVALID_SOCKET;
 715     }
 716 }
 717
 718 void CNode::Cleanup()
 719 {
 720     // All of a nodes broadcasts and subscriptions are automatically torn down
 721     // when it goes down, so a node has to stay up to keep its broadcast going.
 722
 723     // Cancel subscriptions
 724     for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++)
 725         if (vfSubscribe[nChannel])
 726             CancelSubscribe(nChannel);
 727 }
 728
 729
 730 void CNode::PushVersion()
 731 {
 732     /// when NTP implemented, change to just nTime = GetAdjustedTime()
 733     int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
 734     CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr);
 735     CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost);
 736     RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
 737     PushMessage("version", PROTOCOL_VERSION, nLocalServices, nTime, addrYou, addrMe,
 738                 nLocalHostNonce, FormatSubVersion(CLIENT_NAME, CLIENT_VERSION, std::vector<string>()), nBestHeight);
 739 }
 740
 741
 742
 743
 744
 745 std::map<unsigned int, int64> CNode::setBanned;
 746 CCriticalSection CNode::cs_setBanned;
 747
 748 void CNode::ClearBanned()
 749 {
 750     setBanned.clear();
 751 }
 752
 753 bool CNode::IsBanned(unsigned int ip)
 754 {
 755     bool fResult = false;
 756     CRITICAL_BLOCK(cs_setBanned)
 757     {
 758         std::map<unsigned int, int64>::iterator i = setBanned.find(ip);
 759         if (i != setBanned.end())
 760         {
 761             int64 t = (*i).second;
 762             if (GetTime() < t)
 763                 fResult = true;
 764         }
 765     }
 766     return fResult;
 767 }
 768
 769 bool CNode::Misbehaving(int howmuch)
 770 {
 771     if (addr.IsLocal())
 772     {
 773         printf("Warning: local node %s misbehaving\n", addr.ToString().c_str());
 774         return false;
 775     }
 776
 777     nMisbehavior += howmuch;
 778     if (nMisbehavior >= GetArg("-banscore", 100))
 779     {
 780         int64 banTime = GetTime()+GetArg("-bantime", 60*60*24);  // Default 24-hour ban
 781         CRITICAL_BLOCK(cs_setBanned)
 782             if (setBanned[addr.ip] < banTime)
 783                 setBanned[addr.ip] = banTime;
 784         CloseSocketDisconnect();
 785         printf("Disconnected %s for misbehavior (score=%d)\n", addr.ToString().c_str(), nMisbehavior);
 786         return true;
 787     }
 788     return false;
 789 }
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802 void ThreadSocketHandler(void* parg)
 803 {
 804     IMPLEMENT_RANDOMIZE_STACK(ThreadSocketHandler(parg));
 805     try
 806     {
 807         vnThreadsRunning[0]++;
 808         ThreadSocketHandler2(parg);
 809         vnThreadsRunning[0]--;
 810     }
 811     catch (std::exception& e) {
 812         vnThreadsRunning[0]--;
 813         PrintException(&e, "ThreadSocketHandler()");
 814     } catch (...) {
 815         vnThreadsRunning[0]--;
 816         throw; // support pthread_cancel()
 817     }
 818     printf("ThreadSocketHandler exiting\n");
 819 }
 820
 821 void ThreadSocketHandler2(void* parg)
 822 {
 823     printf("ThreadSocketHandler started\n");
 824     list<CNode*> vNodesDisconnected;
 825     int nPrevNodeCount = 0;
 826
 827     loop
 828     {
 829         //
 830         // Disconnect nodes
 831         //
 832         CRITICAL_BLOCK(cs_vNodes)
 833         {
 834             // Disconnect unused nodes
 835             vector<CNode*> vNodesCopy = vNodes;
 836             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 837             {
 838                 if (pnode->fDisconnect ||
 839                     (pnode->GetRefCount() <= 0 && pnode->vRecv.empty() && pnode->vSend.empty()))
 840                 {
 841                     // remove from vNodes
 842                     vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
 843
 844                     // close socket and cleanup
 845                     pnode->CloseSocketDisconnect();
 846                     pnode->Cleanup();
 847
 848                     // hold in disconnected pool until all refs are released
 849                     pnode->nReleaseTime = max(pnode->nReleaseTime, GetTime() + 15 * 60);
 850                     if (pnode->fNetworkNode || pnode->fInbound)
 851                         pnode->Release();
 852                     vNodesDisconnected.push_back(pnode);
 853                 }
 854             }
 855
 856             // Delete disconnected nodes
 857             list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
 858             BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)
 859             {
 860                 // wait until threads are done using it
 861                 if (pnode->GetRefCount() <= 0)
 862                 {
 863                     bool fDelete = false;
 864                     TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 865                      TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
 866                       TRY_CRITICAL_BLOCK(pnode->cs_mapRequests)
 867                        TRY_CRITICAL_BLOCK(pnode->cs_inventory)
 868                         fDelete = true;
 869                     if (fDelete)
 870                     {
 871                         vNodesDisconnected.remove(pnode);
 872                         delete pnode;
 873                     }
 874                 }
 875             }
 876         }
 877         if (vNodes.size() != nPrevNodeCount)
 878         {
 879             nPrevNodeCount = vNodes.size();
 880             MainFrameRepaint();
 881         }
 882
 883
 884         //
 885         // Find which sockets have data to receive
 886         //
 887         struct timeval timeout;
 888         timeout.tv_sec  = 0;
 889         timeout.tv_usec = 50000; // frequency to poll pnode->vSend
 890
 891         fd_set fdsetRecv;
 892         fd_set fdsetSend;
 893         fd_set fdsetError;
 894         FD_ZERO(&fdsetRecv);
 895         FD_ZERO(&fdsetSend);
 896         FD_ZERO(&fdsetError);
 897         SOCKET hSocketMax = 0;
 898
 899         if(hListenSocket != INVALID_SOCKET)
 900             FD_SET(hListenSocket, &fdsetRecv);
 901         hSocketMax = max(hSocketMax, hListenSocket);
 902         CRITICAL_BLOCK(cs_vNodes)
 903         {
 904             BOOST_FOREACH(CNode* pnode, vNodes)
 905             {
 906                 if (pnode->hSocket == INVALID_SOCKET)
 907                     continue;
 908                 FD_SET(pnode->hSocket, &fdsetRecv);
 909                 FD_SET(pnode->hSocket, &fdsetError);
 910                 hSocketMax = max(hSocketMax, pnode->hSocket);
 911                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
 912                     if (!pnode->vSend.empty())
 913                         FD_SET(pnode->hSocket, &fdsetSend);
 914             }
 915         }
 916
 917         vnThreadsRunning[0]--;
 918         int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
 919         vnThreadsRunning[0]++;
 920         if (fShutdown)
 921             return;
 922         if (nSelect == SOCKET_ERROR)
 923         {
 924             int nErr = WSAGetLastError();
 925             if (hSocketMax > -1)
 926             {
 927                 printf("socket select error %d\n", nErr);
 928                 for (int i = 0; i <= hSocketMax; i++)
 929                     FD_SET(i, &fdsetRecv);
 930             }
 931             FD_ZERO(&fdsetSend);
 932             FD_ZERO(&fdsetError);
 933             Sleep(timeout.tv_usec/1000);
 934         }
 935
 936
 937         //
 938         // Accept new connections
 939         //
 940         if (hListenSocket != INVALID_SOCKET && FD_ISSET(hListenSocket, &fdsetRecv))
 941         {
 942             struct sockaddr_in sockaddr;
 943             socklen_t len = sizeof(sockaddr);
 944             SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
 945             CAddress addr(sockaddr);
 946             int nInbound = 0;
 947
 948             CRITICAL_BLOCK(cs_vNodes)
 949                 BOOST_FOREACH(CNode* pnode, vNodes)
 950                 if (pnode->fInbound)
 951                     nInbound++;
 952             if (hSocket == INVALID_SOCKET)
 953             {
 954                 if (WSAGetLastError() != WSAEWOULDBLOCK)
 955                     printf("socket error accept failed: %d\n", WSAGetLastError());
 956             }
 957             else if (nInbound >= GetArg("-maxconnections", 125) - MAX_OUTBOUND_CONNECTIONS)
 958             {
 959                 closesocket(hSocket);
 960             }
 961             else if (CNode::IsBanned(addr.ip))
 962             {
 963                 printf("connetion from %s dropped (banned)\n", addr.ToString().c_str());
 964                 closesocket(hSocket);
 965             }
 966             else
 967             {
 968                 printf("accepted connection %s\n", addr.ToString().c_str());
 969                 CNode* pnode = new CNode(hSocket, addr, true);
 970                 pnode->AddRef();
 971                 CRITICAL_BLOCK(cs_vNodes)
 972                     vNodes.push_back(pnode);
 973             }
 974         }
 975
 976
 977         //
 978         // Service each socket
 979         //
 980         vector<CNode*> vNodesCopy;
 981         CRITICAL_BLOCK(cs_vNodes)
 982         {
 983             vNodesCopy = vNodes;
 984             BOOST_FOREACH(CNode* pnode, vNodesCopy)
 985                 pnode->AddRef();
 986         }
 987         BOOST_FOREACH(CNode* pnode, vNodesCopy)
 988         {
 989             if (fShutdown)
 990                 return;
 991
 992             //
 993             // Receive
 994             //
 995             if (pnode->hSocket == INVALID_SOCKET)
 996                 continue;
 997             if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
 998             {
 999                 TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
1000                 {
1001                     CDataStream& vRecv = pnode->vRecv;
1002                     unsigned int nPos = vRecv.size();
1003
1004                     if (nPos > ReceiveBufferSize()) {
1005                         if (!pnode->fDisconnect)
1006                             printf("socket recv flood control disconnect (%d bytes)\n", vRecv.size());
1007                         pnode->CloseSocketDisconnect();
1008                     }
1009                     else {
1010                         // typical socket buffer is 8K-64K
1011                         char pchBuf[0x10000];
1012                         int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
1013                         if (nBytes > 0)
1014                         {
1015                             vRecv.resize(nPos + nBytes);
1016                             memcpy(&vRecv[nPos], pchBuf, nBytes);
1017                             pnode->nLastRecv = GetTime();
1018                         }
1019                         else if (nBytes == 0)
1020                         {
1021                             // socket closed gracefully
1022                             if (!pnode->fDisconnect)
1023                                 printf("socket closed\n");
1024                             pnode->CloseSocketDisconnect();
1025                         }
1026                         else if (nBytes < 0)
1027                         {
1028                             // error
1029                             int nErr = WSAGetLastError();
1030                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
1031                             {
1032                                 if (!pnode->fDisconnect)
1033                                     printf("socket recv error %d\n", nErr);
1034                                 pnode->CloseSocketDisconnect();
1035                             }
1036                         }
1037                     }
1038                 }
1039             }
1040
1041             //
1042             // Send
1043             //
1044             if (pnode->hSocket == INVALID_SOCKET)
1045                 continue;
1046             if (FD_ISSET(pnode->hSocket, &fdsetSend))
1047             {
1048                 TRY_CRITICAL_BLOCK(pnode->cs_vSend)
1049                 {
1050                     CDataStream& vSend = pnode->vSend;
1051                     if (!vSend.empty())
1052                     {
1053                         int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT);
1054                         if (nBytes > 0)
1055                         {
1056                             vSend.erase(vSend.begin(), vSend.begin() + nBytes);
1057                             pnode->nLastSend = GetTime();
1058                         }
1059                         else if (nBytes < 0)
1060                         {
1061                             // error
1062                             int nErr = WSAGetLastError();
1063                             if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
1064                             {
1065                                 printf("socket send error %d\n", nErr);
1066                                 pnode->CloseSocketDisconnect();
1067                             }
1068                         }
1069                         if (vSend.size() > SendBufferSize()) {
1070                             if (!pnode->fDisconnect)
1071                                 printf("socket send flood control disconnect (%d bytes)\n", vSend.size());
1072                             pnode->CloseSocketDisconnect();
1073                         }
1074                     }
1075                 }
1076             }
1077
1078             //
1079             // Inactivity checking
1080             //
1081             if (pnode->vSend.empty())
1082                 pnode->nLastSendEmpty = GetTime();
1083             if (GetTime() - pnode->nTimeConnected > 60)
1084             {
1085                 if (pnode->nLastRecv == 0 || pnode->nLastSend == 0)
1086                 {
1087                     printf("socket no message in first 60 seconds, %d %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0);
1088                     pnode->fDisconnect = true;
1089                 }
1090                 else if (GetTime() - pnode->nLastSend > 90*60 && GetTime() - pnode->nLastSendEmpty > 90*60)
1091                 {
1092                     printf("socket not sending\n");
1093                     pnode->fDisconnect = true;
1094                 }
1095                 else if (GetTime() - pnode->nLastRecv > 90*60)
1096                 {
1097                     printf("socket inactivity timeout\n");
1098                     pnode->fDisconnect = true;
1099                 }
1100             }
1101         }
1102         CRITICAL_BLOCK(cs_vNodes)
1103         {
1104             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1105                 pnode->Release();
1106         }
1107
1108         Sleep(10);
1109     }
1110 }
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120 #ifdef USE_UPNP
1121 void ThreadMapPort(void* parg)
1122 {
1123     IMPLEMENT_RANDOMIZE_STACK(ThreadMapPort(parg));
1124     try
1125     {
1126         vnThreadsRunning[5]++;
1127         ThreadMapPort2(parg);
1128         vnThreadsRunning[5]--;
1129     }
1130     catch (std::exception& e) {
1131         vnThreadsRunning[5]--;
1132         PrintException(&e, "ThreadMapPort()");
1133     } catch (...) {
1134         vnThreadsRunning[5]--;
1135         PrintException(NULL, "ThreadMapPort()");
1136     }
1137     printf("ThreadMapPort exiting\n");
1138 }
1139
1140 void ThreadMapPort2(void* parg)
1141 {
1142     printf("ThreadMapPort started\n");
1143
1144     char port[6];
1145     sprintf(port, "%d", GetListenPort());
1146
1147     const char * rootdescurl = 0;
1148     const char * multicastif = 0;
1149     const char * minissdpdpath = 0;
1150     struct UPNPDev * devlist = 0;
1151     char lanaddr[64];
1152
1153 #ifndef UPNPDISCOVER_SUCCESS
1154     /* miniupnpc 1.5 */
1155     devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0);
1156 #else
1157     /* miniupnpc 1.6 */
1158     int error = 0;
1159     devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
1160 #endif
1161
1162     struct UPNPUrls urls;
1163     struct IGDdatas data;
1164     int r;
1165
1166     r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
1167     if (r == 1)
1168     {
1169         char intClient[16];
1170         char intPort[6];
1171         string strDesc = "Bitcoin " + FormatFullVersion();
1172 #ifndef UPNPDISCOVER_SUCCESS
1173     /* miniupnpc 1.5 */
1174         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1175                                 port, port, lanaddr, strDesc.c_str(), "TCP", 0);
1176 #else
1177     /* miniupnpc 1.6 */
1178         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
1179                                 port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
1180 #endif
1181
1182         if(r!=UPNPCOMMAND_SUCCESS)
1183             printf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
1184                 port, port, lanaddr, r, strupnperror(r));
1185         else
1186             printf("UPnP Port Mapping successful.\n");
1187         loop {
1188             if (fShutdown || !fUseUPnP)
1189             {
1190                 r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port, "TCP", 0);
1191                 printf("UPNP_DeletePortMapping() returned : %d\n", r);
1192                 freeUPNPDevlist(devlist); devlist = 0;
1193                 FreeUPNPUrls(&urls);
1194                 return;
1195             }
1196             Sleep(2000);
1197         }
1198     } else {
1199         printf("No valid UPnP IGDs found\n");
1200         freeUPNPDevlist(devlist); devlist = 0;
1201         if (r != 0)
1202             FreeUPNPUrls(&urls);
1203         loop {
1204             if (fShutdown || !fUseUPnP)
1205                 return;
1206             Sleep(2000);
1207         }
1208     }
1209 }
1210
1211 void MapPort(bool fMapPort)
1212 {
1213     if (fUseUPnP != fMapPort)
1214     {
1215         fUseUPnP = fMapPort;
1216         WriteSetting("fUseUPnP", fUseUPnP);
1217     }
1218     if (fUseUPnP && vnThreadsRunning[5] < 1)
1219     {
1220         if (!CreateThread(ThreadMapPort, NULL))
1221             printf("Error: ThreadMapPort(ThreadMapPort) failed\n");
1222     }
1223 }
1224 #else
1225 void MapPort(bool /* unused fMapPort */)
1226 {
1227     // Intentionally left blank.
1228 }
1229 #endif
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240 static const char *strDNSSeed[] = {
1241     "bitseed.xf2.org",
1242     "dnsseed.bluematt.me",
1243 };
1244
1245 void ThreadDNSAddressSeed(void* parg)
1246 {
1247     IMPLEMENT_RANDOMIZE_STACK(ThreadDNSAddressSeed(parg));
1248     try
1249     {
1250         vnThreadsRunning[6]++;
1251         ThreadDNSAddressSeed2(parg);
1252         vnThreadsRunning[6]--;
1253     }
1254     catch (std::exception& e) {
1255         vnThreadsRunning[6]--;
1256         PrintException(&e, "ThreadDNSAddressSeed()");
1257     } catch (...) {
1258         vnThreadsRunning[6]--;
1259         throw; // support pthread_cancel()
1260     }
1261     printf("ThreadDNSAddressSeed exiting\n");
1262 }
1263
1264 void ThreadDNSAddressSeed2(void* parg)
1265 {
1266     printf("ThreadDNSAddressSeed started\n");
1267     int found = 0;
1268
1269     if (!fTestNet)
1270     {
1271         printf("Loading addresses from DNS seeds (could take a while)\n");
1272         CAddrDB addrDB;
1273         addrDB.TxnBegin();
1274
1275         for (int seed_idx = 0; seed_idx < ARRAYLEN(strDNSSeed); seed_idx++) {
1276             vector<CAddress> vaddr;
1277             if (Lookup(strDNSSeed[seed_idx], vaddr, NODE_NETWORK, -1, true))
1278             {
1279                 BOOST_FOREACH (CAddress& addr, vaddr)
1280                 {
1281                     if (addr.GetByte(3) != 127)
1282                     {
1283                         addr.nTime = 0;
1284                         AddAddress(addr, 0, &addrDB);
1285                         found++;
1286                     }
1287                 }
1288             }
1289         }
1290
1291         addrDB.TxnCommit();  // Save addresses (it's ok if this fails)
1292     }
1293
1294     printf("%d addresses found from DNS seeds\n", found);
1295 }
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308 unsigned int pnSeed[] =
1309 {
1310     0x6884ac63, 0x3ffecead, 0x2919b953, 0x0942fe50, 0x7a1d922e, 0xcdd6734a, 0x953a5bb6, 0x2c46922e,
1311     0xe2a5f143, 0xaa39103a, 0xa06afa5c, 0x135ffd59, 0xe8e82863, 0xf61ef029, 0xf75f042e, 0x2b363532,
1312     0x29b2df42, 0x16b1f64e, 0xd46e281b, 0x5280bf58, 0x60372229, 0x1be58e4f, 0xa8496f45, 0x1fb1a057,
1313     0x756b3844, 0x3bb79445, 0x0b375518, 0xcccb0102, 0xb682bf2e, 0x46431c02, 0x3a81073a, 0xa3771f1f,
1314     0x213a121f, 0x85dc2c1b, 0x56b4323b, 0xb34e8945, 0x3c40b33d, 0xfa276418, 0x1f818d29, 0xebe1e344,
1315     0xf6160a18, 0xf4fa384a, 0x34b09558, 0xb882b543, 0xe3ce2253, 0x6abf56d8, 0xe91b1155, 0x688ee6ad,
1316     0x2efc6058, 0x4792cd47, 0x0c32f757, 0x4c813a46, 0x8c93644a, 0x37507444, 0x813ad218, 0xdac06d4a,
1317     0xe4c63e4b, 0x21a1ea3c, 0x8d88556f, 0x30e9173a, 0x041f681b, 0xdc77ba50, 0xc0072753, 0xceddd44f,
1318     0x052d1743, 0xe3c77a4a, 0x13981c3a, 0x5685d918, 0x3c0e4e70, 0x3e56fb54, 0xb676ae0c, 0xac93c859,
1319     0x22279f43, 0x975a4542, 0xe527f071, 0xea162f2e, 0x3c65a32e, 0x5be5713b, 0x961ec418, 0xb202922e,
1320     0x5ef7be50, 0xce49f53e, 0x05803b47, 0x8463b055, 0x78576153, 0x3ec2ae3a, 0x4bbd7118, 0xafcee043,
1321     0x56a3e8ba, 0x6174de4d, 0x8d01ba4b, 0xc9af564e, 0xdbc9c547, 0xa627474d, 0xdada9244, 0xd3b3083a,
1322     0x523e071f, 0xd6b96f18, 0xbd527c46, 0xdf2bbb4d, 0xd37b4a4b, 0x3a6a2158, 0xc064b055, 0x18a8e055,
1323     0xec4dae3b, 0x0540416c, 0x475b4fbe, 0x064803b2, 0x48e9f062, 0x2898524b, 0xd315ff43, 0xf786d247,
1324     0xc7ea2f3e, 0xc087f043, 0xc163354b, 0x8250284d, 0xed300029, 0xbf36e05c, 0x8eb3ae4c, 0xe7aa623e,
1325     0x7ced0274, 0xdd362c1b, 0x362b995a, 0xca26b629, 0x3fc41618, 0xb97b364e, 0xa05b8729, 0x0f5e3c43,
1326     0xdf942618, 0x6aeb9b5b, 0xbf04762e, 0xfaaeb118, 0x87579958, 0x76520044, 0xc2660c5b, 0x628b201b,
1327     0xf193932e, 0x1c0ad045, 0xff908346, 0x8da9d4da, 0xed201c1f, 0xa47a2b1b, 0x330007d4, 0x8ba1ed47,
1328     0xb2f02d44, 0x7db62c1b, 0x781c454b, 0xc0300029, 0xb7062a45, 0x88b52e3a, 0x78dd6b63, 0x1cb9b718,
1329     0x5d358e47, 0x59912c3b, 0x79607544, 0x5197f759, 0xc023be48, 0xd1013743, 0x0f354057, 0x8e3aac3b,
1330     0x4114693e, 0x22316318, 0xe27dda50, 0x878eac3b, 0x4948a21f, 0x5db7f24c, 0x8ccb6157, 0x26a5de18,
1331     0x0a11bd43, 0x27bb1e41, 0x60a7a951, 0x3e16b35e, 0x07888b53, 0x5648a853, 0x0149fe50, 0xd070a34f,
1332     0x6454c96d, 0xd6e54758, 0xa96dc152, 0x65447861, 0xf6bdf95e, 0x10400202, 0x2c29d483, 0x18174732,
1333     0x1d840618, 0x12e61818, 0x089d3f3c, 0x917e931f, 0xd1b0c90e, 0x25bd3c42, 0xeb05775b, 0x7d550c59,
1334     0x6cfacb01, 0xe4224444, 0xa41dd943, 0x0f5aa643, 0x5e33731b, 0x81036d50, 0x6f46a0d1, 0x7731be43,
1335     0x14840e18, 0xf1e8d059, 0x661d2b1f, 0x40a3201b, 0x9407b843, 0xedf0254d, 0x7bd1a5bc, 0x073dbe51,
1336     0xe864a97b, 0x2efd947b, 0xb9ca0e45, 0x4e2113ad, 0xcc305731, 0xd39ca63c, 0x733df918, 0xda172b1f,
1337     0xaa03b34d, 0x7230fd4d, 0xf1ce6e3a, 0x2e9fab43, 0xa4010750, 0xa928bd18, 0x6809be42, 0xb19de348,
1338     0xff956270, 0x0d795f51, 0xd2dec247, 0x6df5774b, 0xbac11f79, 0xdfb05c75, 0x887683d8, 0xa1e83632,
1339     0x2c0f7671, 0x28bcb65d, 0xac2a7545, 0x3eebfc60, 0x304ad7c4, 0xa215a462, 0xc86f0f58, 0xcfb92ebe,
1340     0x5e23ed82, 0xf506184b, 0xec0f19b7, 0x060c59ad, 0x86ee3174, 0x85380774, 0xa199a562, 0x02b507ae,
1341     0x33eb2163, 0xf2112b1f, 0xb702ba50, 0x131b9618, 0x90ccd04a, 0x08f3273b, 0xecb61718, 0x64b8b44d,
1342     0x182bf4dc, 0xc7b68286, 0x6e318d5f, 0xfdb03654, 0xb3272e54, 0xe014ad4b, 0x274e4a31, 0x7806375c,
1343     0xbc34a748, 0x1b5ad94a, 0x6b54d10e, 0x73e2ae6e, 0x5529d483, 0x8455a76d, 0x99c13f47, 0x1d811741,
1344     0xa9782a78, 0x0b00464d, 0x7266ea50, 0x532dab46, 0x33e1413e, 0x780d0c18, 0x0fb0854e, 0x03370155,
1345     0x2693042e, 0xfa3d824a, 0x2bb1681b, 0x37ea2a18, 0x7fb8414b, 0x32e0713b, 0xacf38d3f, 0xa282716f,
1346     0xb1a09d7b, 0xa04b764b, 0x83c94d18, 0x05ee4c6d, 0x0e795f51, 0x46984352, 0xf80fc247, 0x3fccb946,
1347     0xd7ae244b, 0x0a8e0a4c, 0x57b141bc, 0x3647bed1, 0x1431b052, 0x803a8bbb, 0xfc69056b, 0xf5991862,
1348     0x14963b2e, 0xd35d5dda, 0xc6c73574, 0xc8f1405b, 0x0ca4224d, 0xecd36071, 0xa9461754, 0xe7a0ed72,
1349     0x559e8346, 0x1c9beec1, 0xc786ea4a, 0x9561b44d, 0x9788074d, 0x1a69934f, 0x23c5614c, 0x07c79d4b,
1350     0xc7ee52db, 0xc72df351, 0xcb135e44, 0xa0988346, 0xc211fc4c, 0x87dec34b, 0x1381074d, 0x04a65cb7,
1351     0x4409083a, 0x4a407a4c, 0x92b8d37d, 0xacf50b4d, 0xa58aa5bc, 0x448f801f, 0x9c83762e, 0x6fd5734a,
1352     0xfe2d454b, 0x84144c55, 0x05190e4c, 0xb2151448, 0x63867a3e, 0x16099018, 0x9c010d3c, 0x962d8f3d,
1353     0xd51ee453, 0x9d86801f, 0x68e87b47, 0x6bf7bb73, 0x5fc7910e, 0x10d90118, 0x3db04442, 0x729d3e4b,
1354     0xc397d842, 0x57bb15ad, 0x72f31f4e, 0xc9380043, 0x2bb24e18, 0xd9b8ab50, 0xb786801f, 0xf4dc4847,
1355     0x85f4bb51, 0x4435995b, 0x5ba07e40, 0x2c57392e, 0x3628124b, 0x9839b64b, 0x6fe8b24d, 0xaddce847,
1356     0x75260e45, 0x0c572a43, 0xfea21902, 0xb9f9742e, 0x5a70d443, 0x8fc5910e, 0x868d4744, 0x56245e02,
1357     0xd7eb5f02, 0x35c12c1b, 0x4373034b, 0x8786554c, 0xa6facf18, 0x4b11a31f, 0x3570664e, 0x5a64bc42,
1358     0x0b03983f, 0x8f457e4c, 0x0fd874c3, 0xb6cf31b2, 0x2bbc2d4e, 0x146ca5b2, 0x9d00b150, 0x048a4153,
1359     0xca4dcd43, 0xc1607cca, 0x8234cf57, 0x9c7daead, 0x3dc07658, 0xea5c6e4c, 0xf1a0084e, 0x16d2ee53,
1360     0x1b849418, 0xfe913a47, 0x1e988f62, 0x208b644c, 0xc55ee980, 0xbdbce747, 0xf59a384e, 0x0f56091b,
1361     0x7417b745, 0x0c37344e, 0x2c62ab47, 0xf8533a4d, 0x8030084d, 0x76b93c4b, 0xda6ea0ad, 0x3c54f618,
1362     0x63b0de1f, 0x7370d858, 0x1a70bb4c, 0xdda63b2e, 0x60b2ba50, 0x1ba7d048, 0xbe1b2c1b, 0xabea5747,
1363     0x29ad2e4d, 0xe8cd7642, 0x66c80e18, 0x138bf34a, 0xc6145e44, 0x2586794c, 0x07bc5478, 0x0da0b14d,
1364     0x8f95354e, 0x9eb11c62, 0xa1545e46, 0x2e7a2602, 0x408c9c3d, 0x59065d55, 0xf51d1a4c, 0x3bbc6a4e,
1365     0xc71b2a2e, 0xcdaaa545, 0x17d659d0, 0x5202e7ad, 0xf1b68445, 0x93375961, 0xbd88a043, 0x066ad655,
1366     0x890f6318, 0x7b7dca47, 0x99bdd662, 0x3bb4fc53, 0x1231efdc, 0xc0a99444, 0x96bbea47, 0x61ed8748,
1367     0x27dfa73b, 0x8d4d1754, 0x3460042e, 0x551f0c4c, 0x8d0e0718, 0x162ddc53, 0x53231718, 0x1ecd65d0,
1368     0x944d28bc, 0x3b79d058, 0xaff97fbc, 0x4860006c, 0xc101c90e, 0xace41743, 0xa5975d4c, 0x5cc2703e,
1369     0xb55a4450, 0x02d18840, 0xee2765ae, 0xd6012fd5, 0x24c94d7d, 0x8c6eec47, 0x7520ba5d, 0x9e15e460,
1370     0x8510b04c, 0x75ec3847, 0x1dfa6661, 0xe172b3ad, 0x5744c90e, 0x52a0a152, 0x8d6fad18, 0x67b74b6d,
1371     0x93a089b2, 0x0f3ac5d5, 0xe5de1855, 0x43d25747, 0x4bad804a, 0x55b408d8, 0x60a36441, 0xf553e860,
1372     0xdb2fa2c8, 0x03152b32, 0xdd27a7d5, 0x3116a8b8, 0x0a1d708c, 0xeee2f13c, 0x6acf436f, 0xce6eb4ca,
1373     0x101cd3d9, 0x1c48a6b8, 0xe57d6f44, 0x93dcf562,
1374 };
1375
1376
1377
1378 void ThreadOpenConnections(void* parg)
1379 {
1380     IMPLEMENT_RANDOMIZE_STACK(ThreadOpenConnections(parg));
1381     try
1382     {
1383         vnThreadsRunning[1]++;
1384         ThreadOpenConnections2(parg);
1385         vnThreadsRunning[1]--;
1386     }
1387     catch (std::exception& e) {
1388         vnThreadsRunning[1]--;
1389         PrintException(&e, "ThreadOpenConnections()");
1390     } catch (...) {
1391         vnThreadsRunning[1]--;
1392         PrintException(NULL, "ThreadOpenConnections()");
1393     }
1394     printf("ThreadOpenConnections exiting\n");
1395 }
1396
1397 void ThreadOpenConnections2(void* parg)
1398 {
1399     printf("ThreadOpenConnections started\n");
1400
1401     // Connect to specific addresses
1402     if (mapArgs.count("-connect"))
1403     {
1404         for (int64 nLoop = 0;; nLoop++)
1405         {
1406             BOOST_FOREACH(string strAddr, mapMultiArgs["-connect"])
1407             {
1408                 CAddress addr(strAddr, fAllowDNS);
1409                 if (addr.IsValid())
1410                     OpenNetworkConnection(addr);
1411                 for (int i = 0; i < 10 && i < nLoop; i++)
1412                 {
1413                     Sleep(500);
1414                     if (fShutdown)
1415                         return;
1416                 }
1417             }
1418         }
1419     }
1420
1421     // Connect to manually added nodes first
1422     if (mapArgs.count("-addnode"))
1423     {
1424         BOOST_FOREACH(string strAddr, mapMultiArgs["-addnode"])
1425         {
1426             CAddress addr(strAddr, fAllowDNS);
1427             if (addr.IsValid())
1428             {
1429                 OpenNetworkConnection(addr);
1430                 Sleep(500);
1431                 if (fShutdown)
1432                     return;
1433             }
1434         }
1435     }
1436
1437     // Initiate network connections
1438     int64 nStart = GetTime();
1439     loop
1440     {
1441         // Limit outbound connections
1442         vnThreadsRunning[1]--;
1443         Sleep(500);
1444         loop
1445         {
1446             int nOutbound = 0;
1447             CRITICAL_BLOCK(cs_vNodes)
1448                 BOOST_FOREACH(CNode* pnode, vNodes)
1449                     if (!pnode->fInbound)
1450                         nOutbound++;
1451             int nMaxOutboundConnections = MAX_OUTBOUND_CONNECTIONS;
1452             nMaxOutboundConnections = min(nMaxOutboundConnections, (int)GetArg("-maxconnections", 125));
1453             if (nOutbound < nMaxOutboundConnections)
1454                 break;
1455             Sleep(2000);
1456             if (fShutdown)
1457                 return;
1458         }
1459         vnThreadsRunning[1]++;
1460         if (fShutdown)
1461             return;
1462
1463         CRITICAL_BLOCK(cs_mapAddresses)
1464         {
1465             // Add seed nodes if IRC isn't working
1466             bool fTOR = (fUseProxy && addrProxy.port == htons(9050));
1467             if (mapAddresses.empty() && (GetTime() - nStart > 60 || fTOR) && !fTestNet)
1468             {
1469                 for (int i = 0; i < ARRAYLEN(pnSeed); i++)
1470                 {
1471                     // It'll only connect to one or two seed nodes because once it connects,
1472                     // it'll get a pile of addresses with newer timestamps.
1473                     // Seed nodes are given a random 'last seen time' of between one and two
1474                     // weeks ago.
1475                     const int64 nOneWeek = 7*24*60*60;
1476                     CAddress addr;
1477                     addr.ip = pnSeed[i];
1478                     addr.nTime = GetTime()-GetRand(nOneWeek)-nOneWeek;
1479                     AddAddress(addr);
1480                 }
1481             }
1482         }
1483
1484
1485         //
1486         // Choose an address to connect to based on most recently seen
1487         //
1488         CAddress addrConnect;
1489         int64 nBest = INT64_MIN;
1490
1491         // Only connect to one address per a.b.?.? range.
1492         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
1493         set<unsigned int> setConnected;
1494         CRITICAL_BLOCK(cs_vNodes)
1495             BOOST_FOREACH(CNode* pnode, vNodes)
1496                 setConnected.insert(pnode->addr.ip & 0x0000ffff);
1497
1498         int64 nANow = GetAdjustedTime();
1499
1500         CRITICAL_BLOCK(cs_mapAddresses)
1501         {
1502             BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
1503             {
1504                 const CAddress& addr = item.second;
1505                 if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.ip & 0x0000ffff))
1506                     continue;
1507                 int64 nSinceLastSeen = nANow - addr.nTime;
1508                 int64 nSinceLastTry = nANow - addr.nLastTry;
1509
1510                 // Randomize the order in a deterministic way, putting the standard port first
1511                 int64 nRandomizer = (uint64)(nStart * 4951 + addr.nLastTry * 9567851 + addr.ip * 7789) % (2 * 60 * 60);
1512                 if (addr.port != htons(GetDefaultPort()))
1513                     nRandomizer += 2 * 60 * 60;
1514
1515                 // Last seen  Base retry frequency
1516                 //   <1 hour   10 min
1517                 //    1 hour    1 hour
1518                 //    4 hours   2 hours
1519                 //   24 hours   5 hours
1520                 //   48 hours   7 hours
1521                 //    7 days   13 hours
1522                 //   30 days   27 hours
1523                 //   90 days   46 hours
1524                 //  365 days   93 hours
1525                 int64 nDelay = (int64)(3600.0 * sqrt(fabs((double)nSinceLastSeen) / 3600.0) + nRandomizer);
1526
1527                 // Fast reconnect for one hour after last seen
1528                 if (nSinceLastSeen < 60 * 60)
1529                     nDelay = 10 * 60;
1530
1531                 // Limit retry frequency
1532                 if (nSinceLastTry < nDelay)
1533                     continue;
1534
1535                 // If we have IRC, we'll be notified when they first come online,
1536                 // and again every 24 hours by the refresh broadcast.
1537                 if (nGotIRCAddresses > 0 && vNodes.size() >= 2 && nSinceLastSeen > 24 * 60 * 60)
1538                     continue;
1539
1540                 // Only try the old stuff if we don't have enough connections
1541                 if (vNodes.size() >= 8 && nSinceLastSeen > 24 * 60 * 60)
1542                     continue;
1543
1544                 // If multiple addresses are ready, prioritize by time since
1545                 // last seen and time since last tried.
1546                 int64 nScore = min(nSinceLastTry, (int64)24 * 60 * 60) - nSinceLastSeen - nRandomizer;
1547                 if (nScore > nBest)
1548                 {
1549                     nBest = nScore;
1550                     addrConnect = addr;
1551                 }
1552             }
1553         }
1554
1555         if (addrConnect.IsValid())
1556             OpenNetworkConnection(addrConnect);
1557     }
1558 }
1559
1560 bool OpenNetworkConnection(const CAddress& addrConnect)
1561 {
1562     //
1563     // Initiate outbound network connection
1564     //
1565     if (fShutdown)
1566         return false;
1567     if (addrConnect.ip == addrLocalHost.ip || !addrConnect.IsIPv4() ||
1568         FindNode(addrConnect.ip) || CNode::IsBanned(addrConnect.ip))
1569         return false;
1570
1571     vnThreadsRunning[1]--;
1572     CNode* pnode = ConnectNode(addrConnect);
1573     vnThreadsRunning[1]++;
1574     if (fShutdown)
1575         return false;
1576     if (!pnode)
1577         return false;
1578     pnode->fNetworkNode = true;
1579
1580     return true;
1581 }
1582
1583
1584
1585
1586
1587
1588
1589
1590 void ThreadMessageHandler(void* parg)
1591 {
1592     IMPLEMENT_RANDOMIZE_STACK(ThreadMessageHandler(parg));
1593     try
1594     {
1595         vnThreadsRunning[2]++;
1596         ThreadMessageHandler2(parg);
1597         vnThreadsRunning[2]--;
1598     }
1599     catch (std::exception& e) {
1600         vnThreadsRunning[2]--;
1601         PrintException(&e, "ThreadMessageHandler()");
1602     } catch (...) {
1603         vnThreadsRunning[2]--;
1604         PrintException(NULL, "ThreadMessageHandler()");
1605     }
1606     printf("ThreadMessageHandler exiting\n");
1607 }
1608
1609 void ThreadMessageHandler2(void* parg)
1610 {
1611     printf("ThreadMessageHandler started\n");
1612     SetThreadPriority(THREAD_PRIORITY_BELOW_NORMAL);
1613     while (!fShutdown)
1614     {
1615         vector<CNode*> vNodesCopy;
1616         CRITICAL_BLOCK(cs_vNodes)
1617         {
1618             vNodesCopy = vNodes;
1619             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1620                 pnode->AddRef();
1621         }
1622
1623         // Poll the connected nodes for messages
1624         CNode* pnodeTrickle = NULL;
1625         if (!vNodesCopy.empty())
1626             pnodeTrickle = vNodesCopy[GetRand(vNodesCopy.size())];
1627         BOOST_FOREACH(CNode* pnode, vNodesCopy)
1628         {
1629             // Receive messages
1630             TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
1631                 ProcessMessages(pnode);
1632             if (fShutdown)
1633                 return;
1634
1635             // Send messages
1636             TRY_CRITICAL_BLOCK(pnode->cs_vSend)
1637                 SendMessages(pnode, pnode == pnodeTrickle);
1638             if (fShutdown)
1639                 return;
1640         }
1641
1642         CRITICAL_BLOCK(cs_vNodes)
1643         {
1644             BOOST_FOREACH(CNode* pnode, vNodesCopy)
1645                 pnode->Release();
1646         }
1647
1648         // Wait and allow messages to bunch up.
1649         // Reduce vnThreadsRunning so StopNode has permission to exit while
1650         // we're sleeping, but we must always check fShutdown after doing this.
1651         vnThreadsRunning[2]--;
1652         Sleep(100);
1653         if (fRequestShutdown)
1654             Shutdown(NULL);
1655         vnThreadsRunning[2]++;
1656         if (fShutdown)
1657             return;
1658     }
1659 }
1660
1661
1662
1663
1664
1665
1666 bool BindListenPort(string& strError)
1667 {
1668     strError = "";
1669     int nOne = 1;
1670     addrLocalHost.port = htons(GetListenPort());
1671
1672 #ifdef WIN32
1673     // Initialize Windows Sockets
1674     WSADATA wsadata;
1675     int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
1676     if (ret != NO_ERROR)
1677     {
1678         strError = strprintf("Error: TCP/IP socket library failed to start (WSAStartup returned error %d)", ret);
1679         printf("%s\n", strError.c_str());
1680         return false;
1681     }
1682 #endif
1683
1684     // Create socket for listening for incoming connections
1685     hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1686     if (hListenSocket == INVALID_SOCKET)
1687     {
1688         strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError());
1689         printf("%s\n", strError.c_str());
1690         return false;
1691     }
1692
1693 #ifdef SO_NOSIGPIPE
1694     // Different way of disabling SIGPIPE on BSD
1695     setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int));
1696 #endif
1697
1698 #ifndef WIN32
1699     // Allow binding if the port is still in TIME_WAIT state after
1700     // the program was closed and restarted.  Not an issue on windows.
1701     setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
1702 #endif
1703
1704 #ifdef WIN32
1705     // Set to nonblocking, incoming connections will also inherit this
1706     if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR)
1707 #else
1708     if (fcntl(hListenSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
1709 #endif
1710     {
1711         strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %d)", WSAGetLastError());
1712         printf("%s\n", strError.c_str());
1713         return false;
1714     }
1715
1716     // The sockaddr_in structure specifies the address family,
1717     // IP address, and port for the socket that is being bound
1718     struct sockaddr_in sockaddr;
1719     memset(&sockaddr, 0, sizeof(sockaddr));
1720     sockaddr.sin_family = AF_INET;
1721     sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer
1722     sockaddr.sin_port = htons(GetListenPort());
1723     if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
1724     {
1725         int nErr = WSAGetLastError();
1726         if (nErr == WSAEADDRINUSE)
1727             strError = strprintf(_("Unable to bind to port %d on this computer.  Bitcoin is probably already running."), ntohs(sockaddr.sin_port));
1728         else
1729             strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr);
1730         printf("%s\n", strError.c_str());
1731         return false;
1732     }
1733     printf("Bound to port %d\n", ntohs(sockaddr.sin_port));
1734
1735     // Listen for incoming connections
1736     if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
1737     {
1738         strError = strprintf("Error: Listening for incoming connections failed (listen returned error %d)", WSAGetLastError());
1739         printf("%s\n", strError.c_str());
1740         return false;
1741     }
1742
1743     return true;
1744 }
1745
1746 void StartNode(void* parg)
1747 {
1748     if (pnodeLocalHost == NULL)
1749         pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress("127.0.0.1", 0, false, nLocalServices));
1750
1751 #ifdef WIN32
1752     // Get local host ip
1753     char pszHostName[1000] = "";
1754     if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
1755     {
1756         vector<CAddress> vaddr;
1757         if (Lookup(pszHostName, vaddr, nLocalServices, -1, true))
1758             BOOST_FOREACH (const CAddress &addr, vaddr)
1759                 if (addr.GetByte(3) != 127)
1760                 {
1761                     addrLocalHost = addr;
1762                     break;
1763                 }
1764     }
1765 #else
1766     // Get local host ip
1767     struct ifaddrs* myaddrs;
1768     if (getifaddrs(&myaddrs) == 0)
1769     {
1770         for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
1771         {
1772             if (ifa->ifa_addr == NULL) continue;
1773             if ((ifa->ifa_flags & IFF_UP) == 0) continue;
1774             if (strcmp(ifa->ifa_name, "lo") == 0) continue;
1775             if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
1776             char pszIP[100];
1777             if (ifa->ifa_addr->sa_family == AF_INET)
1778             {
1779                 struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
1780                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL)
1781                     printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP);
1782
1783                 // Take the first IP that isn't loopback 127.x.x.x
1784                 CAddress addr(*(unsigned int*)&s4->sin_addr, GetListenPort(), nLocalServices);
1785                 if (addr.IsValid() && addr.GetByte(3) != 127)
1786                 {
1787                     addrLocalHost = addr;
1788                     break;
1789                 }
1790             }
1791             else if (ifa->ifa_addr->sa_family == AF_INET6)
1792             {
1793                 struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
1794                 if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL)
1795                     printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP);
1796             }
1797         }
1798         freeifaddrs(myaddrs);
1799     }
1800 #endif
1801     printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1802
1803     if (fUseProxy || mapArgs.count("-connect") || fNoListen)
1804     {
1805         // Proxies can't take incoming connections
1806         addrLocalHost.ip = CAddress("0.0.0.0").ip;
1807         printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
1808     }
1809     else
1810     {
1811         CreateThread(ThreadGetMyExternalIP, NULL);
1812     }
1813
1814     //
1815     // Start threads
1816     //
1817
1818     if (GetBoolArg("-nodnsseed"))
1819         printf("DNS seeding disabled\n");
1820     else
1821         if (!CreateThread(ThreadDNSAddressSeed, NULL))
1822             printf("Error: CreateThread(ThreadDNSAddressSeed) failed\n");
1823
1824     // Map ports with UPnP
1825     if (fHaveUPnP)
1826         MapPort(fUseUPnP);
1827
1828     // Get addresses from IRC and advertise ours
1829     if (!CreateThread(ThreadIRCSeed, NULL))
1830         printf("Error: CreateThread(ThreadIRCSeed) failed\n");
1831
1832     // Send and receive from sockets, accept connections
1833     if (!CreateThread(ThreadSocketHandler, NULL))
1834         printf("Error: CreateThread(ThreadSocketHandler) failed\n");
1835
1836     // Initiate outbound connections
1837     if (!CreateThread(ThreadOpenConnections, NULL))
1838         printf("Error: CreateThread(ThreadOpenConnections) failed\n");
1839
1840     // Process messages
1841     if (!CreateThread(ThreadMessageHandler, NULL))
1842         printf("Error: CreateThread(ThreadMessageHandler) failed\n");
1843
1844     // Generate coins in the background
1845     GenerateBitcoins(fGenerateBitcoins, pwalletMain);
1846 }
1847
1848 bool StopNode()
1849 {
1850     printf("StopNode()\n");
1851     fShutdown = true;
1852     nTransactionsUpdated++;
1853     int64 nStart = GetTime();
1854     while (vnThreadsRunning[0] > 0 || vnThreadsRunning[2] > 0 || vnThreadsRunning[3] > 0 || vnThreadsRunning[4] > 0
1855 #ifdef USE_UPNP
1856         || vnThreadsRunning[5] > 0
1857 #endif
1858     )
1859     {
1860         if (GetTime() - nStart > 20)
1861             break;
1862         Sleep(20);
1863     }
1864     if (vnThreadsRunning[0] > 0) printf("ThreadSocketHandler still running\n");
1865     if (vnThreadsRunning[1] > 0) printf("ThreadOpenConnections still running\n");
1866     if (vnThreadsRunning[2] > 0) printf("ThreadMessageHandler still running\n");
1867     if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n");
1868     if (vnThreadsRunning[4] > 0) printf("ThreadRPCServer still running\n");
1869     if (fHaveUPnP && vnThreadsRunning[5] > 0) printf("ThreadMapPort still running\n");
1870     if (vnThreadsRunning[6] > 0) printf("ThreadDNSAddressSeed still running\n");
1871     while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
1872         Sleep(20);
1873     Sleep(50);
1874
1875     return true;
1876 }
1877
1878 class CNetCleanup
1879 {
1880 public:
1881     CNetCleanup()
1882     {
1883     }
1884     ~CNetCleanup()
1885     {
1886         // Close sockets
1887         BOOST_FOREACH(CNode* pnode, vNodes)
1888             if (pnode->hSocket != INVALID_SOCKET)
1889                 closesocket(pnode->hSocket);
1890         if (hListenSocket != INVALID_SOCKET)
1891             if (closesocket(hListenSocket) == SOCKET_ERROR)
1892                 printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
1893
1894 #ifdef WIN32
1895         // Shutdown Windows Sockets
1896         WSACleanup();
1897 #endif
1898     }
1899 }
1900 instance_of_cnetcleanup;