integration of core bitcoin

1 files changed, 1665 insertions, 0 deletions

diff --git a/core/src/net.cpp b/core/src/net.cpp
new file mode 100644
index 0000000000..4f489fdb57
--- /dev/null
+++ b/core/src/net.cpp
@@ -0,0 +1,1665 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include "headers.h"
+
+#ifdef USE_UPNP
+#include <miniupnpc/miniwget.h>
+#include <miniupnpc/miniupnpc.h>
+#include <miniupnpc/upnpcommands.h>
+#include <miniupnpc/upnperrors.h>
+#endif
+
+using namespace std;
+using namespace boost;
+
+static const int MAX_OUTBOUND_CONNECTIONS = 8;
+
+void ThreadMessageHandler2(void* parg);
+void ThreadSocketHandler2(void* parg);
+void ThreadOpenConnections2(void* parg);
+#ifdef USE_UPNP
+void ThreadMapPort2(void* parg);
+#endif
+bool OpenNetworkConnection(const CAddress& addrConnect);
+
+
+
+
+
+//
+// Global state variables
+//
+bool fClient = false;
+bool fAllowDNS = false;
+uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
+CAddress addrLocalHost("0.0.0.0", 0, false, nLocalServices);
+CNode* pnodeLocalHost = NULL;
+uint64 nLocalHostNonce = 0;
+array<int, 10> vnThreadsRunning;
+SOCKET hListenSocket = INVALID_SOCKET;
+
+vector<CNode*> vNodes;
+CCriticalSection cs_vNodes;
+map<vector<unsigned char>, CAddress> mapAddresses;
+CCriticalSection cs_mapAddresses;
+map<CInv, CDataStream> mapRelay;
+deque<pair<int64, CInv> > vRelayExpiration;
+CCriticalSection cs_mapRelay;
+map<CInv, int64> mapAlreadyAskedFor;
+
+// Settings
+int fUseProxy = false;
+CAddress addrProxy("127.0.0.1",9050);
+
+
+
+
+
+void CNode::PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd)
+{
+    // Filter out duplicate requests
+    if (pindexBegin == pindexLastGetBlocksBegin && hashEnd == hashLastGetBlocksEnd)
+        return;
+    pindexLastGetBlocksBegin = pindexBegin;
+    hashLastGetBlocksEnd = hashEnd;
+
+    PushMessage("getblocks", CBlockLocator(pindexBegin), hashEnd);
+}
+
+
+
+
+
+bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet)
+{
+    hSocketRet = INVALID_SOCKET;
+
+    SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (hSocket == INVALID_SOCKET)
+        return false;
+#ifdef BSD
+    int set = 1;
+    setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
+#endif
+
+    bool fRoutable = !(addrConnect.GetByte(3) == 10 || (addrConnect.GetByte(3) == 192 && addrConnect.GetByte(2) == 168));
+    bool fProxy = (fUseProxy && fRoutable);
+    struct sockaddr_in sockaddr = (fProxy ? addrProxy.GetSockAddr() : addrConnect.GetSockAddr());
+
+    if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
+    {
+        closesocket(hSocket);
+        return false;
+    }
+
+    if (fProxy)
+    {
+        printf("proxy connecting %s\n", addrConnect.ToString().c_str());
+        char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
+        memcpy(pszSocks4IP + 2, &addrConnect.port, 2);
+        memcpy(pszSocks4IP + 4, &addrConnect.ip, 4);
+        char* pszSocks4 = pszSocks4IP;
+        int nSize = sizeof(pszSocks4IP);
+
+        int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL);
+        if (ret != nSize)
+        {
+            closesocket(hSocket);
+            return error("Error sending to proxy");
+        }
+        char pchRet[8];
+        if (recv(hSocket, pchRet, 8, 0) != 8)
+        {
+            closesocket(hSocket);
+            return error("Error reading proxy response");
+        }
+        if (pchRet[1] != 0x5a)
+        {
+            closesocket(hSocket);
+            if (pchRet[1] != 0x5b)
+                printf("ERROR: Proxy returned error %d\n", pchRet[1]);
+            return false;
+        }
+        printf("proxy connected %s\n", addrConnect.ToString().c_str());
+    }
+
+    hSocketRet = hSocket;
+    return true;
+}
+
+// portDefault is in host order
+bool Lookup(const char *pszName, vector<CAddress>& vaddr, int nServices, int nMaxSolutions, bool fAllowLookup, int portDefault, bool fAllowPort)
+{
+    vaddr.clear();
+    int port = portDefault;
+    char psz[256];
+    char *pszHost = psz;
+    strlcpy(psz, pszName, sizeof(psz));
+    if (fAllowPort)
+    {
+        char* pszColon = strrchr(psz+1,':');
+        char *pszPortEnd = NULL;
+        int portParsed = pszColon ? strtoul(pszColon+1, &pszPortEnd, 10) : 0;
+        if (pszColon && pszPortEnd && pszPortEnd[0] == 0)
+        {
+            if (psz[0] == '[' && pszColon[-1] == ']')
+            {
+                // Future: enable IPv6 colon-notation inside []
+                pszHost = psz+1;
+                pszColon[-1] = 0;
+            }
+            else
+                pszColon[0] = 0;
+            port = portParsed;
+            if (port < 0 || port > USHRT_MAX)
+                port = USHRT_MAX;
+        }
+    }
+
+    struct in_addr addrIP;
+    if (inet_aton(pszHost, &addrIP))
+    {
+        // valid IP address passed
+        vaddr.push_back(CAddress(addrIP.s_addr, port, nServices));
+        return true;
+    }
+
+    if (!fAllowLookup)
+        return false;
+
+    struct hostent* phostent = gethostbyname(pszHost);
+    if (!phostent)
+        return false;
+
+    if (phostent->h_addrtype != AF_INET)
+        return false;
+
+    char** ppAddr = phostent->h_addr_list;
+    while (*ppAddr != NULL && vaddr.size() != nMaxSolutions)
+    {
+        CAddress addr(((struct in_addr*)ppAddr[0])->s_addr, port, nServices);
+        if (addr.IsValid())
+            vaddr.push_back(addr);
+        ppAddr++;
+    }
+
+    return (vaddr.size() > 0);
+}
+
+// portDefault is in host order
+bool Lookup(const char *pszName, CAddress& addr, int nServices, bool fAllowLookup, int portDefault, bool fAllowPort)
+{
+    vector<CAddress> vaddr;
+    bool fRet = Lookup(pszName, vaddr, nServices, 1, fAllowLookup, portDefault, fAllowPort);
+    if (fRet)
+        addr = vaddr[0];
+    return fRet;
+}
+
+bool GetMyExternalIP2(const CAddress& addrConnect, const char* pszGet, const char* pszKeyword, unsigned int& ipRet)
+{
+    SOCKET hSocket;
+    if (!ConnectSocket(addrConnect, hSocket))
+        return error("GetMyExternalIP() : connection to %s failed", addrConnect.ToString().c_str());
+
+    send(hSocket, pszGet, strlen(pszGet), MSG_NOSIGNAL);
+
+    string strLine;
+    while (RecvLine(hSocket, strLine))
+    {
+        if (strLine.empty()) // HTTP response is separated from headers by blank line
+        {
+            loop
+            {
+                if (!RecvLine(hSocket, strLine))
+                {
+                    closesocket(hSocket);
+                    return false;
+                }
+                if (pszKeyword == NULL)
+                    break;
+                if (strLine.find(pszKeyword) != -1)
+                {
+                    strLine = strLine.substr(strLine.find(pszKeyword) + strlen(pszKeyword));
+                    break;
+                }
+            }
+            closesocket(hSocket);
+            if (strLine.find("<") != -1)
+                strLine = strLine.substr(0, strLine.find("<"));
+            strLine = strLine.substr(strspn(strLine.c_str(), " \t\n\r"));
+            while (strLine.size() > 0 && isspace(strLine[strLine.size()-1]))
+                strLine.resize(strLine.size()-1);
+            CAddress addr(strLine,0,true);
+            printf("GetMyExternalIP() received [%s] %s\n", strLine.c_str(), addr.ToString().c_str());
+            if (addr.ip == 0 || addr.ip == INADDR_NONE || !addr.IsRoutable())
+                return false;
+            ipRet = addr.ip;
+            return true;
+        }
+    }
+    closesocket(hSocket);
+    return error("GetMyExternalIP() : connection closed");
+}
+
+// We now get our external IP from the IRC server first and only use this as a backup
+bool GetMyExternalIP(unsigned int& ipRet)
+{
+    CAddress addrConnect;
+    const char* pszGet;
+    const char* pszKeyword;
+
+    if (fUseProxy)
+        return false;
+
+    for (int nLookup = 0; nLookup <= 1; nLookup++)
+    for (int nHost = 1; nHost <= 2; nHost++)
+    {
+        // We should be phasing out our use of sites like these.  If we need
+        // replacements, we should ask for volunteers to put this simple
+        // php file on their webserver that prints the client IP:
+        //  <?php echo $_SERVER["REMOTE_ADDR"]; ?>
+        if (nHost == 1)
+        {
+            addrConnect = CAddress("91.198.22.70",80); // checkip.dyndns.org
+
+            if (nLookup == 1)
+            {
+                CAddress addrIP("checkip.dyndns.org", 80, true);
+                if (addrIP.IsValid())
+                    addrConnect = addrIP;
+            }
+
+            pszGet = "GET / HTTP/1.1\r\n"
+                     "Host: checkip.dyndns.org\r\n"
+                     "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n"
+                     "Connection: close\r\n"
+                     "\r\n";
+
+            pszKeyword = "Address:";
+        }
+        else if (nHost == 2)
+        {
+            addrConnect = CAddress("74.208.43.192", 80); // www.showmyip.com
+
+            if (nLookup == 1)
+            {
+                CAddress addrIP("www.showmyip.com", 80, true);
+                if (addrIP.IsValid())
+                    addrConnect = addrIP;
+            }
+
+            pszGet = "GET /simple/ HTTP/1.1\r\n"
+                     "Host: www.showmyip.com\r\n"
+                     "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)\r\n"
+                     "Connection: close\r\n"
+                     "\r\n";
+
+            pszKeyword = NULL; // Returns just IP address
+        }
+
+        if (GetMyExternalIP2(addrConnect, pszGet, pszKeyword, ipRet))
+            return true;
+    }
+
+    return false;
+}
+
+void ThreadGetMyExternalIP(void* parg)
+{
+    // Wait for IRC to get it first
+    if (!GetBoolArg("-noirc"))
+    {
+        for (int i = 0; i < 2 * 60; i++)
+        {
+            Sleep(1000);
+            if (fGotExternalIP || fShutdown)
+                return;
+        }
+    }
+
+    // Fallback in case IRC fails to get it
+    if (GetMyExternalIP(addrLocalHost.ip))
+    {
+        printf("GetMyExternalIP() returned %s\n", addrLocalHost.ToStringIP().c_str());
+        if (addrLocalHost.IsRoutable())
+        {
+            // If we already connected to a few before we had our IP, go back and addr them.
+            // setAddrKnown automatically filters any duplicate sends.
+            CAddress addr(addrLocalHost);
+            addr.nTime = GetAdjustedTime();
+            CRITICAL_BLOCK(cs_vNodes)
+                BOOST_FOREACH(CNode* pnode, vNodes)
+                    pnode->PushAddress(addr);
+        }
+    }
+}
+
+
+
+
+
+bool AddAddress(CAddress addr, int64 nTimePenalty)
+{
+    if (!addr.IsRoutable())
+        return false;
+    if (addr.ip == addrLocalHost.ip)
+        return false;
+    addr.nTime = max((int64)0, (int64)addr.nTime - nTimePenalty);
+    CRITICAL_BLOCK(cs_mapAddresses)
+    {
+        map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
+        if (it == mapAddresses.end())
+        {
+            // New address
+            printf("AddAddress(%s)\n", addr.ToString().c_str());
+            mapAddresses.insert(make_pair(addr.GetKey(), addr));
+            CAddrDB().WriteAddress(addr);
+            return true;
+        }
+        else
+        {
+            bool fUpdated = false;
+            CAddress& addrFound = (*it).second;
+            if ((addrFound.nServices | addr.nServices) != addrFound.nServices)
+            {
+                // Services have been added
+                addrFound.nServices |= addr.nServices;
+                fUpdated = true;
+            }
+            bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
+            int64 nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
+            if (addrFound.nTime < addr.nTime - nUpdateInterval)
+            {
+                // Periodically update most recently seen time
+                addrFound.nTime = addr.nTime;
+                fUpdated = true;
+            }
+            if (fUpdated)
+                CAddrDB().WriteAddress(addrFound);
+        }
+    }
+    return false;
+}
+
+void AddressCurrentlyConnected(const CAddress& addr)
+{
+    CRITICAL_BLOCK(cs_mapAddresses)
+    {
+        // Only if it's been published already
+        map<vector<unsigned char>, CAddress>::iterator it = mapAddresses.find(addr.GetKey());
+        if (it != mapAddresses.end())
+        {
+            CAddress& addrFound = (*it).second;
+            int64 nUpdateInterval = 20 * 60;
+            if (addrFound.nTime < GetAdjustedTime() - nUpdateInterval)
+            {
+                // Periodically update most recently seen time
+                addrFound.nTime = GetAdjustedTime();
+                CAddrDB addrdb;
+                addrdb.WriteAddress(addrFound);
+            }
+        }
+    }
+}
+
+
+
+
+
+void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1)
+{
+    // If the dialog might get closed before the reply comes back,
+    // call this in the destructor so it doesn't get called after it's deleted.
+    CRITICAL_BLOCK(cs_vNodes)
+    {
+        BOOST_FOREACH(CNode* pnode, vNodes)
+        {
+            CRITICAL_BLOCK(pnode->cs_mapRequests)
+            {
+                for (map<uint256, CRequestTracker>::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();)
+                {
+                    CRequestTracker& tracker = (*mi).second;
+                    if (tracker.fn == fn && tracker.param1 == param1)
+                        pnode->mapRequests.erase(mi++);
+                    else
+                        mi++;
+                }
+            }
+        }
+    }
+}
+
+
+
+
+
+
+
+//
+// Subscription methods for the broadcast and subscription system.
+// Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT.
+//
+// The subscription system uses a meet-in-the-middle strategy.
+// With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers
+// subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through.
+//
+
+bool AnySubscribed(unsigned int nChannel)
+{
+    if (pnodeLocalHost->IsSubscribed(nChannel))
+        return true;
+    CRITICAL_BLOCK(cs_vNodes)
+        BOOST_FOREACH(CNode* pnode, vNodes)
+            if (pnode->IsSubscribed(nChannel))
+                return true;
+    return false;
+}
+
+bool CNode::IsSubscribed(unsigned int nChannel)
+{
+    if (nChannel >= vfSubscribe.size())
+        return false;
+    return vfSubscribe[nChannel];
+}
+
+void CNode::Subscribe(unsigned int nChannel, unsigned int nHops)
+{
+    if (nChannel >= vfSubscribe.size())
+        return;
+
+    if (!AnySubscribed(nChannel))
+    {
+        // Relay subscribe
+        CRITICAL_BLOCK(cs_vNodes)
+            BOOST_FOREACH(CNode* pnode, vNodes)
+                if (pnode != this)
+                    pnode->PushMessage("subscribe", nChannel, nHops);
+    }
+
+    vfSubscribe[nChannel] = true;
+}
+
+void CNode::CancelSubscribe(unsigned int nChannel)
+{
+    if (nChannel >= vfSubscribe.size())
+        return;
+
+    // Prevent from relaying cancel if wasn't subscribed
+    if (!vfSubscribe[nChannel])
+        return;
+    vfSubscribe[nChannel] = false;
+
+    if (!AnySubscribed(nChannel))
+    {
+        // Relay subscription cancel
+        CRITICAL_BLOCK(cs_vNodes)
+            BOOST_FOREACH(CNode* pnode, vNodes)
+                if (pnode != this)
+                    pnode->PushMessage("sub-cancel", nChannel);
+    }
+}
+
+
+
+
+
+
+
+
+
+CNode* FindNode(unsigned int ip)
+{
+    CRITICAL_BLOCK(cs_vNodes)
+    {
+        BOOST_FOREACH(CNode* pnode, vNodes)
+            if (pnode->addr.ip == ip)
+                return (pnode);
+    }
+    return NULL;
+}
+
+CNode* FindNode(CAddress addr)
+{
+    CRITICAL_BLOCK(cs_vNodes)
+    {
+        BOOST_FOREACH(CNode* pnode, vNodes)
+            if (pnode->addr == addr)
+                return (pnode);
+    }
+    return NULL;
+}
+
+CNode* ConnectNode(CAddress addrConnect, int64 nTimeout)
+{
+    if (addrConnect.ip == addrLocalHost.ip)
+        return NULL;
+
+    // Look for an existing connection
+    CNode* pnode = FindNode(addrConnect.ip);
+    if (pnode)
+    {
+        if (nTimeout != 0)
+            pnode->AddRef(nTimeout);
+        else
+            pnode->AddRef();
+        return pnode;
+    }
+
+    /// debug print
+    printf("trying connection %s lastseen=%.1fhrs lasttry=%.1fhrs\n",
+        addrConnect.ToString().c_str(),
+        (double)(addrConnect.nTime - GetAdjustedTime())/3600.0,
+        (double)(addrConnect.nLastTry - GetAdjustedTime())/3600.0);
+
+    CRITICAL_BLOCK(cs_mapAddresses)
+        mapAddresses[addrConnect.GetKey()].nLastTry = GetAdjustedTime();
+
+    // Connect
+    SOCKET hSocket;
+    if (ConnectSocket(addrConnect, hSocket))
+    {
+        /// debug print
+        printf("connected %s\n", addrConnect.ToString().c_str());
+
+        // Set to nonblocking
+#ifdef __WXMSW__
+        u_long nOne = 1;
+        if (ioctlsocket(hSocket, FIONBIO, &nOne) == SOCKET_ERROR)
+            printf("ConnectSocket() : ioctlsocket nonblocking setting failed, error %d\n", WSAGetLastError());
+#else
+        if (fcntl(hSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
+            printf("ConnectSocket() : fcntl nonblocking setting failed, error %d\n", errno);
+#endif
+
+        // Add node
+        CNode* pnode = new CNode(hSocket, addrConnect, false);
+        if (nTimeout != 0)
+            pnode->AddRef(nTimeout);
+        else
+            pnode->AddRef();
+        CRITICAL_BLOCK(cs_vNodes)
+            vNodes.push_back(pnode);
+
+        pnode->nTimeConnected = GetTime();
+        return pnode;
+    }
+    else
+    {
+        return NULL;
+    }
+}
+
+void CNode::CloseSocketDisconnect()
+{
+    fDisconnect = true;
+    if (hSocket != INVALID_SOCKET)
+    {
+        if (fDebug)
+            printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
+        printf("disconnecting node %s\n", addr.ToString().c_str());
+        closesocket(hSocket);
+        hSocket = INVALID_SOCKET;
+    }
+}
+
+void CNode::Cleanup()
+{
+    // All of a nodes broadcasts and subscriptions are automatically torn down
+    // when it goes down, so a node has to stay up to keep its broadcast going.
+
+    // Cancel subscriptions
+    for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++)
+        if (vfSubscribe[nChannel])
+            CancelSubscribe(nChannel);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+void ThreadSocketHandler(void* parg)
+{
+    IMPLEMENT_RANDOMIZE_STACK(ThreadSocketHandler(parg));
+    try
+    {
+        vnThreadsRunning[0]++;
+        ThreadSocketHandler2(parg);
+        vnThreadsRunning[0]--;
+    }
+    catch (std::exception& e) {
+        vnThreadsRunning[0]--;
+        PrintException(&e, "ThreadSocketHandler()");
+    } catch (...) {
+        vnThreadsRunning[0]--;
+        throw; // support pthread_cancel()
+    }
+    printf("ThreadSocketHandler exiting\n");
+}
+
+void ThreadSocketHandler2(void* parg)
+{
+    printf("ThreadSocketHandler started\n");
+    list<CNode*> vNodesDisconnected;
+    int nPrevNodeCount = 0;
+
+    loop
+    {
+        //
+        // Disconnect nodes
+        //
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            // Disconnect unused nodes
+            vector<CNode*> vNodesCopy = vNodes;
+            BOOST_FOREACH(CNode* pnode, vNodesCopy)
+            {
+                if (pnode->fDisconnect ||
+                    (pnode->GetRefCount() <= 0 && pnode->vRecv.empty() && pnode->vSend.empty()))
+                {
+                    // remove from vNodes
+                    vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
+
+                    // close socket and cleanup
+                    pnode->CloseSocketDisconnect();
+                    pnode->Cleanup();
+
+                    // hold in disconnected pool until all refs are released
+                    pnode->nReleaseTime = max(pnode->nReleaseTime, GetTime() + 15 * 60);
+                    if (pnode->fNetworkNode || pnode->fInbound)
+                        pnode->Release();
+                    vNodesDisconnected.push_back(pnode);
+                }
+            }
+
+            // Delete disconnected nodes
+            list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
+            BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)
+            {
+                // wait until threads are done using it
+                if (pnode->GetRefCount() <= 0)
+                {
+                    bool fDelete = false;
+                    TRY_CRITICAL_BLOCK(pnode->cs_vSend)
+                     TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
+                      TRY_CRITICAL_BLOCK(pnode->cs_mapRequests)
+                       TRY_CRITICAL_BLOCK(pnode->cs_inventory)
+                        fDelete = true;
+                    if (fDelete)
+                    {
+                        vNodesDisconnected.remove(pnode);
+                        delete pnode;
+                    }
+                }
+            }
+        }
+        if (vNodes.size() != nPrevNodeCount)
+        {
+            nPrevNodeCount = vNodes.size();
+            MainFrameRepaint();
+        }
+
+
+        //
+        // Find which sockets have data to receive
+        //
+        struct timeval timeout;
+        timeout.tv_sec  = 0;
+        timeout.tv_usec = 50000; // frequency to poll pnode->vSend
+
+        fd_set fdsetRecv;
+        fd_set fdsetSend;
+        fd_set fdsetError;
+        FD_ZERO(&fdsetRecv);
+        FD_ZERO(&fdsetSend);
+        FD_ZERO(&fdsetError);
+        SOCKET hSocketMax = 0;
+
+        if(hListenSocket != INVALID_SOCKET)
+            FD_SET(hListenSocket, &fdsetRecv);
+        hSocketMax = max(hSocketMax, hListenSocket);
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            BOOST_FOREACH(CNode* pnode, vNodes)
+            {
+                if (pnode->hSocket == INVALID_SOCKET || pnode->hSocket < 0)
+                    continue;
+                FD_SET(pnode->hSocket, &fdsetRecv);
+                FD_SET(pnode->hSocket, &fdsetError);
+                hSocketMax = max(hSocketMax, pnode->hSocket);
+                TRY_CRITICAL_BLOCK(pnode->cs_vSend)
+                    if (!pnode->vSend.empty())
+                        FD_SET(pnode->hSocket, &fdsetSend);
+            }
+        }
+
+        vnThreadsRunning[0]--;
+        int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
+        vnThreadsRunning[0]++;
+        if (fShutdown)
+            return;
+        if (nSelect == SOCKET_ERROR)
+        {
+            int nErr = WSAGetLastError();
+            printf("socket select error %d\n", nErr);
+            for (int i = 0; i <= hSocketMax; i++)
+                FD_SET(i, &fdsetRecv);
+            FD_ZERO(&fdsetSend);
+            FD_ZERO(&fdsetError);
+            Sleep(timeout.tv_usec/1000);
+        }
+
+
+        //
+        // Accept new connections
+        //
+        if (hListenSocket != INVALID_SOCKET && FD_ISSET(hListenSocket, &fdsetRecv))
+        {
+            struct sockaddr_in sockaddr;
+            socklen_t len = sizeof(sockaddr);
+            SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
+            CAddress addr(sockaddr);
+            int nInbound = 0;
+
+            CRITICAL_BLOCK(cs_vNodes)
+                BOOST_FOREACH(CNode* pnode, vNodes)
+                if (pnode->fInbound)
+                    nInbound++;
+            if (hSocket == INVALID_SOCKET)
+            {
+                if (WSAGetLastError() != WSAEWOULDBLOCK)
+                    printf("socket error accept failed: %d\n", WSAGetLastError());
+            }
+            else if (nInbound >= GetArg("-maxconnections", 125) - MAX_OUTBOUND_CONNECTIONS)
+            {
+                closesocket(hSocket);
+            }
+            else
+            {
+                printf("accepted connection %s\n", addr.ToString().c_str());
+                CNode* pnode = new CNode(hSocket, addr, true);
+                pnode->AddRef();
+                CRITICAL_BLOCK(cs_vNodes)
+                    vNodes.push_back(pnode);
+            }
+        }
+
+
+        //
+        // Service each socket
+        //
+        vector<CNode*> vNodesCopy;
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            vNodesCopy = vNodes;
+            BOOST_FOREACH(CNode* pnode, vNodesCopy)
+                pnode->AddRef();
+        }
+        BOOST_FOREACH(CNode* pnode, vNodesCopy)
+        {
+            if (fShutdown)
+                return;
+
+            //
+            // Receive
+            //
+            if (pnode->hSocket == INVALID_SOCKET)
+                continue;
+            if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
+            {
+                TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
+                {
+                    CDataStream& vRecv = pnode->vRecv;
+                    unsigned int nPos = vRecv.size();
+
+                    if (nPos > 1000*GetArg("-maxreceivebuffer", 10*1000)) {
+                        if (!pnode->fDisconnect)
+                            printf("socket recv flood control disconnect (%d bytes)\n", vRecv.size());
+                        pnode->CloseSocketDisconnect();
+                    }
+                    else {
+                        // typical socket buffer is 8K-64K
+                        char pchBuf[0x10000];
+                        int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
+                        if (nBytes > 0)
+                        {
+                            vRecv.resize(nPos + nBytes);
+                            memcpy(&vRecv[nPos], pchBuf, nBytes);
+                            pnode->nLastRecv = GetTime();
+                        }
+                        else if (nBytes == 0)
+                        {
+                            // socket closed gracefully
+                            if (!pnode->fDisconnect)
+                                printf("socket closed\n");
+                            pnode->CloseSocketDisconnect();
+                        }
+                        else if (nBytes < 0)
+                        {
+                            // error
+                            int nErr = WSAGetLastError();
+                            if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
+                            {
+                                if (!pnode->fDisconnect)
+                                    printf("socket recv error %d\n", nErr);
+                                pnode->CloseSocketDisconnect();
+                            }
+                        }
+                    }
+                }
+            }
+
+            //
+            // Send
+            //
+            if (pnode->hSocket == INVALID_SOCKET)
+                continue;
+            if (FD_ISSET(pnode->hSocket, &fdsetSend))
+            {
+                TRY_CRITICAL_BLOCK(pnode->cs_vSend)
+                {
+                    CDataStream& vSend = pnode->vSend;
+                    if (!vSend.empty())
+                    {
+                        int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT);
+                        if (nBytes > 0)
+                        {
+                            vSend.erase(vSend.begin(), vSend.begin() + nBytes);
+                            pnode->nLastSend = GetTime();
+                        }
+                        else if (nBytes < 0)
+                        {
+                            // error
+                            int nErr = WSAGetLastError();
+                            if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
+                            {
+                                printf("socket send error %d\n", nErr);
+                                pnode->CloseSocketDisconnect();
+                            }
+                        }
+                        if (vSend.size() > 1000*GetArg("-maxsendbuffer", 10*1000)) {
+                            if (!pnode->fDisconnect)
+                                printf("socket send flood control disconnect (%d bytes)\n", vSend.size());
+                            pnode->CloseSocketDisconnect();
+                        }
+                    }
+                }
+            }
+
+            //
+            // Inactivity checking
+            //
+            if (pnode->vSend.empty())
+                pnode->nLastSendEmpty = GetTime();
+            if (GetTime() - pnode->nTimeConnected > 60)
+            {
+                if (pnode->nLastRecv == 0 || pnode->nLastSend == 0)
+                {
+                    printf("socket no message in first 60 seconds, %d %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0);
+                    pnode->fDisconnect = true;
+                }
+                else if (GetTime() - pnode->nLastSend > 90*60 && GetTime() - pnode->nLastSendEmpty > 90*60)
+                {
+                    printf("socket not sending\n");
+                    pnode->fDisconnect = true;
+                }
+                else if (GetTime() - pnode->nLastRecv > 90*60)
+                {
+                    printf("socket inactivity timeout\n");
+                    pnode->fDisconnect = true;
+                }
+            }
+        }
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            BOOST_FOREACH(CNode* pnode, vNodesCopy)
+                pnode->Release();
+        }
+
+        Sleep(10);
+    }
+}
+
+
+
+
+
+
+
+
+
+#ifdef USE_UPNP
+void ThreadMapPort(void* parg)
+{
+    IMPLEMENT_RANDOMIZE_STACK(ThreadMapPort(parg));
+    try
+    {
+        vnThreadsRunning[5]++;
+        ThreadMapPort2(parg);
+        vnThreadsRunning[5]--;
+    }
+    catch (std::exception& e) {
+        vnThreadsRunning[5]--;
+        PrintException(&e, "ThreadMapPort()");
+    } catch (...) {
+        vnThreadsRunning[5]--;
+        PrintException(NULL, "ThreadMapPort()");
+    }
+    printf("ThreadMapPort exiting\n");
+}
+
+void ThreadMapPort2(void* parg)
+{
+    printf("ThreadMapPort started\n");
+
+    char port[6];
+    sprintf(port, "%d", GetDefaultPort());
+
+    const char * rootdescurl = 0;
+    const char * multicastif = 0;
+    const char * minissdpdpath = 0;
+    struct UPNPDev * devlist = 0;
+    char lanaddr[64];
+
+    devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0);
+
+    struct UPNPUrls urls;
+    struct IGDdatas data;
+    int r;
+
+    r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
+    if (r == 1)
+    {
+        char intClient[16];
+        char intPort[6];
+
+#ifndef __WXMSW__
+        r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
+	                        port, port, lanaddr, 0, "TCP", 0);
+#else
+        r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
+	                        port, port, lanaddr, 0, "TCP", 0, "0");
+#endif
+        if(r!=UPNPCOMMAND_SUCCESS)
+            printf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
+                port, port, lanaddr, r, strupnperror(r));
+        else
+            printf("UPnP Port Mapping successful.\n");
+        loop {
+            if (fShutdown || !fUseUPnP)
+            {
+                r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port, "TCP", 0);
+                printf("UPNP_DeletePortMapping() returned : %d\n", r);
+                freeUPNPDevlist(devlist); devlist = 0;
+                FreeUPNPUrls(&urls);
+                return;
+            }
+            Sleep(2000);
+        }
+    } else {
+        printf("No valid UPnP IGDs found\n");
+        freeUPNPDevlist(devlist); devlist = 0;
+        if (r != 0)
+            FreeUPNPUrls(&urls);
+        loop {
+            if (fShutdown || !fUseUPnP)
+                return;
+            Sleep(2000);
+        }
+    }
+}
+
+void MapPort(bool fMapPort)
+{
+    if (fUseUPnP != fMapPort)
+    {
+        fUseUPnP = fMapPort;
+        CWalletDB().WriteSetting("fUseUPnP", fUseUPnP);
+    }
+    if (fUseUPnP && vnThreadsRunning[5] < 1)
+    {
+        if (!CreateThread(ThreadMapPort, NULL))
+            printf("Error: ThreadMapPort(ThreadMapPort) failed\n");
+    }
+}
+#endif
+
+
+
+
+
+
+
+
+
+
+static const char *strDNSSeed[] = {
+    "bitseed.xf2.org",
+    "bitseed.bitcoin.org.uk",
+};
+
+void DNSAddressSeed()
+{
+    int found = 0;
+
+    printf("Loading addresses from DNS seeds (could take a while)\n");
+
+    for (int seed_idx = 0; seed_idx < ARRAYLEN(strDNSSeed); seed_idx++) {
+        vector<CAddress> vaddr;
+        if (Lookup(strDNSSeed[seed_idx], vaddr, NODE_NETWORK, true))
+        {
+            BOOST_FOREACH (CAddress& addr, vaddr)
+            {
+                if (addr.GetByte(3) != 127)
+                {
+                    addr.nTime = 0;
+                    AddAddress(addr);
+                    found++;
+                }
+            }
+        }
+    }
+
+    printf("%d addresses found from DNS seeds\n", found);
+}
+
+
+
+unsigned int pnSeed[] =
+{
+    0x1ddb1032, 0x6242ce40, 0x52d6a445, 0x2dd7a445, 0x8a53cd47, 0x73263750, 0xda23c257, 0xecd4ed57,
+    0x0a40ec59, 0x75dce160, 0x7df76791, 0x89370bad, 0xa4f214ad, 0x767700ae, 0x638b0418, 0x868a1018,
+    0xcd9f332e, 0x0129653e, 0xcc92dc3e, 0x96671640, 0x56487e40, 0x5b66f440, 0xb1d01f41, 0xf1dc6041,
+    0xc1d12b42, 0x86ba1243, 0x6be4df43, 0x6d4cef43, 0xd18e0644, 0x1ab0b344, 0x6584a345, 0xe7c1a445,
+    0x58cea445, 0xc5daa445, 0x21dda445, 0x3d3b5346, 0x13e55347, 0x1080d24a, 0x8e611e4b, 0x81518e4b,
+    0x6c839e4b, 0xe2ad0a4c, 0xfbbc0a4c, 0x7f5b6e4c, 0x7244224e, 0x1300554e, 0x20690652, 0x5a48b652,
+    0x75c5c752, 0x4335cc54, 0x340fd154, 0x87c07455, 0x087b2b56, 0x8a133a57, 0xac23c257, 0x70374959,
+    0xfb63d45b, 0xb9a1685c, 0x180d765c, 0x674f645d, 0x04d3495e, 0x1de44b5e, 0x4ee8a362, 0x0ded1b63,
+    0xc1b04b6d, 0x8d921581, 0x97b7ea82, 0x1cf83a8e, 0x91490bad, 0x09dc75ae, 0x9a6d79ae, 0xa26d79ae,
+    0x0fd08fae, 0x0f3e3fb2, 0x4f944fb2, 0xcca448b8, 0x3ecd6ab8, 0xa9d5a5bc, 0x8d0119c1, 0x045997d5,
+    0xca019dd9, 0x0d526c4d, 0xabf1ba44, 0x66b1ab55, 0x1165f462, 0x3ed7cbad, 0xa38fae6e, 0x3bd2cbad,
+    0xd36f0547, 0x20df7840, 0x7a337742, 0x549f8e4b, 0x9062365c, 0xd399f562, 0x2b5274a1, 0x8edfa153,
+    0x3bffb347, 0x7074bf58, 0xb74fcbad, 0x5b5a795b, 0x02fa29ce, 0x5a6738d4, 0xe8a1d23e, 0xef98c445,
+    0x4b0f494c, 0xa2bc1e56, 0x7694ad63, 0xa4a800c3, 0x05fda6cd, 0x9f22175e, 0x364a795b, 0x536285d5,
+    0xac44c9d4, 0x0b06254d, 0x150c2fd4, 0x32a50dcc, 0xfd79ce48, 0xf15cfa53, 0x66c01e60, 0x6bc26661,
+    0xc03b47ae, 0x4dda1b81, 0x3285a4c1, 0x883ca96d, 0x35d60a4c, 0xdae09744, 0x2e314d61, 0x84e247cf,
+    0x6c814552, 0x3a1cc658, 0x98d8f382, 0xe584cb5b, 0x15e86057, 0x7b01504e, 0xd852dd48, 0x56382f56,
+    0x0a5df454, 0xa0d18d18, 0x2e89b148, 0xa79c114c, 0xcbdcd054, 0x5523bc43, 0xa9832640, 0x8a066144,
+    0x3894c3bc, 0xab76bf58, 0x6a018ac1, 0xfebf4f43, 0x2f26c658, 0x31102f4e, 0x85e929d5, 0x2a1c175e,
+    0xfc6c2cd1, 0x27b04b6d, 0xdf024650, 0x161748b8, 0x28be6580, 0x57be6580, 0x1cee677a, 0xaa6bb742,
+    0x9a53964b, 0x0a5a2d4d, 0x2434c658, 0x9a494f57, 0x1ebb0e48, 0xf610b85d, 0x077ecf44, 0x085128bc,
+    0x5ba17a18, 0x27ca1b42, 0xf8a00b56, 0xfcd4c257, 0xcf2fc15e, 0xd897e052, 0x4cada04f, 0x2f35f6d5,
+    0x382ce8c9, 0xe523984b, 0x3f946846, 0x60c8be43, 0x41da6257, 0xde0be142, 0xae8a544b, 0xeff0c254,
+    0x1e0f795b, 0xaeb28890, 0xca16acd9, 0x1e47ddd8, 0x8c8c4829, 0xd27dc747, 0xd53b1663, 0x4096b163,
+    0x9c8dd958, 0xcb12f860, 0x9e79305c, 0x40c1a445, 0x4a90c2bc, 0x2c3a464d, 0x2727f23c, 0x30b04b6d,
+    0x59024cb8, 0xa091e6ad, 0x31b04b6d, 0xc29d46a6, 0x63934fb2, 0xd9224dbe, 0x9f5910d8, 0x7f530a6b,
+    0x752e9c95, 0x65453548, 0xa484be46, 0xce5a1b59, 0x710e0718, 0x46a13d18, 0xdaaf5318, 0xc4a8ff53,
+    0x87abaa52, 0xb764cf51, 0xb2025d4a, 0x6d351e41, 0xc035c33e, 0xa432c162, 0x61ef34ae, 0xd16fddbc,
+    0x0870e8c1, 0x3070e8c1, 0x9c71e8c1, 0xa4992363, 0x85a1f663, 0x4184e559, 0x18d96ed8, 0x17b8dbd5,
+    0x60e7cd18, 0xe5ee104c, 0xab17ac62, 0x1e786e1b, 0x5d23b762, 0xf2388fae, 0x88270360, 0x9e5b3d80,
+    0x7da518b2, 0xb5613b45, 0x1ad41f3e, 0xd550854a, 0x8617e9a9, 0x925b229c, 0xf2e92542, 0x47af0544,
+    0x73b5a843, 0xb9b7a0ad, 0x03a748d0, 0x0a6ff862, 0x6694df62, 0x3bfac948, 0x8e098f4f, 0x746916c3,
+    0x02f38e4f, 0x40bb1243, 0x6a54d162, 0x6008414b, 0xa513794c, 0x514aa343, 0x63781747, 0xdbb6795b,
+    0xed065058, 0x42d24b46, 0x1518794c, 0x9b271681, 0x73e4ffad, 0x0654784f, 0x438dc945, 0x641846a6,
+    0x2d1b0944, 0x94b59148, 0x8d369558, 0xa5a97662, 0x8b705b42, 0xce9204ae, 0x8d584450, 0x2df61555,
+    0xeebff943, 0x2e75fb4d, 0x3ef8fc57, 0x9921135e, 0x8e31042e, 0xb5afad43, 0x89ecedd1, 0x9cfcc047,
+    0x8fcd0f4c, 0xbe49f5ad, 0x146a8d45, 0x98669ab8, 0x98d9175e, 0xd1a8e46d, 0x839a3ab8, 0x40a0016c,
+    0x6d27c257, 0x977fffad, 0x7baa5d5d, 0x1213be43, 0xb167e5a9, 0x640fe8ca, 0xbc9ea655, 0x0f820a4c,
+    0x0f097059, 0x69ac957c, 0x366d8453, 0xb1ba2844, 0x8857f081, 0x70b5be63, 0xc545454b, 0xaf36ded1,
+    0xb5a4b052, 0x21f062d1, 0x72ab89b2, 0x74a45318, 0x8312e6bc, 0xb916965f, 0x8aa7c858, 0xfe7effad,
+};
+
+
+
+void ThreadOpenConnections(void* parg)
+{
+    IMPLEMENT_RANDOMIZE_STACK(ThreadOpenConnections(parg));
+    try
+    {
+        vnThreadsRunning[1]++;
+        ThreadOpenConnections2(parg);
+        vnThreadsRunning[1]--;
+    }
+    catch (std::exception& e) {
+        vnThreadsRunning[1]--;
+        PrintException(&e, "ThreadOpenConnections()");
+    } catch (...) {
+        vnThreadsRunning[1]--;
+        PrintException(NULL, "ThreadOpenConnections()");
+    }
+    printf("ThreadOpenConnections exiting\n");
+}
+
+void ThreadOpenConnections2(void* parg)
+{
+    printf("ThreadOpenConnections started\n");
+
+    // Connect to specific addresses
+    if (mapArgs.count("-connect"))
+    {
+        for (int64 nLoop = 0;; nLoop++)
+        {
+            BOOST_FOREACH(string strAddr, mapMultiArgs["-connect"])
+            {
+                CAddress addr(strAddr, fAllowDNS);
+                if (addr.IsValid())
+                    OpenNetworkConnection(addr);
+                for (int i = 0; i < 10 && i < nLoop; i++)
+                {
+                    Sleep(500);
+                    if (fShutdown)
+                        return;
+                }
+            }
+        }
+    }
+
+    // Connect to manually added nodes first
+    if (mapArgs.count("-addnode"))
+    {
+        BOOST_FOREACH(string strAddr, mapMultiArgs["-addnode"])
+        {
+            CAddress addr(strAddr, fAllowDNS);
+            if (addr.IsValid())
+            {
+                OpenNetworkConnection(addr);
+                Sleep(500);
+                if (fShutdown)
+                    return;
+            }
+        }
+    }
+
+    // Initiate network connections
+    int64 nStart = GetTime();
+    loop
+    {
+        // Limit outbound connections
+        vnThreadsRunning[1]--;
+        Sleep(500);
+        loop
+        {
+            int nOutbound = 0;
+            CRITICAL_BLOCK(cs_vNodes)
+                BOOST_FOREACH(CNode* pnode, vNodes)
+                    if (!pnode->fInbound)
+                        nOutbound++;
+            int nMaxOutboundConnections = MAX_OUTBOUND_CONNECTIONS;
+            nMaxOutboundConnections = min(nMaxOutboundConnections, (int)GetArg("-maxconnections", 125));
+            if (nOutbound < nMaxOutboundConnections)
+                break;
+            Sleep(2000);
+            if (fShutdown)
+                return;
+        }
+        vnThreadsRunning[1]++;
+        if (fShutdown)
+            return;
+
+        CRITICAL_BLOCK(cs_mapAddresses)
+        {
+            // Add seed nodes if IRC isn't working
+            static bool fSeedUsed;
+            bool fTOR = (fUseProxy && addrProxy.port == htons(9050));
+            if (mapAddresses.empty() && (GetTime() - nStart > 60 || fTOR) && !fTestNet)
+            {
+                for (int i = 0; i < ARRAYLEN(pnSeed); i++)
+                {
+                    // It'll only connect to one or two seed nodes because once it connects,
+                    // it'll get a pile of addresses with newer timestamps.
+                    CAddress addr;
+                    addr.ip = pnSeed[i];
+                    addr.nTime = 0;
+                    AddAddress(addr);
+                }
+                fSeedUsed = true;
+            }
+
+            if (fSeedUsed && mapAddresses.size() > ARRAYLEN(pnSeed) + 100)
+            {
+                // Disconnect seed nodes
+                set<unsigned int> setSeed(pnSeed, pnSeed + ARRAYLEN(pnSeed));
+                static int64 nSeedDisconnected;
+                if (nSeedDisconnected == 0)
+                {
+                    nSeedDisconnected = GetTime();
+                    CRITICAL_BLOCK(cs_vNodes)
+                        BOOST_FOREACH(CNode* pnode, vNodes)
+                            if (setSeed.count(pnode->addr.ip))
+                                pnode->fDisconnect = true;
+                }
+
+                // Keep setting timestamps to 0 so they won't reconnect
+                if (GetTime() - nSeedDisconnected < 60 * 60)
+                {
+                    BOOST_FOREACH(PAIRTYPE(const vector<unsigned char>, CAddress)& item, mapAddresses)
+                    {
+                        if (setSeed.count(item.second.ip) && item.second.nTime != 0)
+                        {
+                            item.second.nTime = 0;
+                            CAddrDB().WriteAddress(item.second);
+                        }
+                    }
+                }
+            }
+        }
+
+
+        //
+        // Choose an address to connect to based on most recently seen
+        //
+        CAddress addrConnect;
+        int64 nBest = INT64_MIN;
+
+        // Only connect to one address per a.b.?.? range.
+        // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
+        set<unsigned int> setConnected;
+        CRITICAL_BLOCK(cs_vNodes)
+            BOOST_FOREACH(CNode* pnode, vNodes)
+                setConnected.insert(pnode->addr.ip & 0x0000ffff);
+
+        CRITICAL_BLOCK(cs_mapAddresses)
+        {
+            BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
+            {
+                const CAddress& addr = item.second;
+                if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.ip & 0x0000ffff))
+                    continue;
+                int64 nSinceLastSeen = GetAdjustedTime() - addr.nTime;
+                int64 nSinceLastTry = GetAdjustedTime() - addr.nLastTry;
+
+                // Randomize the order in a deterministic way, putting the standard port first
+                int64 nRandomizer = (uint64)(nStart * 4951 + addr.nLastTry * 9567851 + addr.ip * 7789) % (2 * 60 * 60);
+                if (addr.port != htons(GetDefaultPort()))
+                    nRandomizer += 2 * 60 * 60;
+
+                // Last seen  Base retry frequency
+                //   <1 hour   10 min
+                //    1 hour    1 hour
+                //    4 hours   2 hours
+                //   24 hours   5 hours
+                //   48 hours   7 hours
+                //    7 days   13 hours
+                //   30 days   27 hours
+                //   90 days   46 hours
+                //  365 days   93 hours
+                int64 nDelay = (int64)(3600.0 * sqrt(fabs((double)nSinceLastSeen) / 3600.0) + nRandomizer);
+
+                // Fast reconnect for one hour after last seen
+                if (nSinceLastSeen < 60 * 60)
+                    nDelay = 10 * 60;
+
+                // Limit retry frequency
+                if (nSinceLastTry < nDelay)
+                    continue;
+
+                // If we have IRC, we'll be notified when they first come online,
+                // and again every 24 hours by the refresh broadcast.
+                if (nGotIRCAddresses > 0 && vNodes.size() >= 2 && nSinceLastSeen > 24 * 60 * 60)
+                    continue;
+
+                // Only try the old stuff if we don't have enough connections
+                if (vNodes.size() >= 8 && nSinceLastSeen > 24 * 60 * 60)
+                    continue;
+
+                // If multiple addresses are ready, prioritize by time since
+                // last seen and time since last tried.
+                int64 nScore = min(nSinceLastTry, (int64)24 * 60 * 60) - nSinceLastSeen - nRandomizer;
+                if (nScore > nBest)
+                {
+                    nBest = nScore;
+                    addrConnect = addr;
+                }
+            }
+        }
+
+        if (addrConnect.IsValid())
+            OpenNetworkConnection(addrConnect);
+    }
+}
+
+bool OpenNetworkConnection(const CAddress& addrConnect)
+{
+    //
+    // Initiate outbound network connection
+    //
+    if (fShutdown)
+        return false;
+    if (addrConnect.ip == addrLocalHost.ip || !addrConnect.IsIPv4() || FindNode(addrConnect.ip))
+        return false;
+
+    vnThreadsRunning[1]--;
+    CNode* pnode = ConnectNode(addrConnect);
+    vnThreadsRunning[1]++;
+    if (fShutdown)
+        return false;
+    if (!pnode)
+        return false;
+    pnode->fNetworkNode = true;
+
+    return true;
+}
+
+
+
+
+
+
+
+
+void ThreadMessageHandler(void* parg)
+{
+    IMPLEMENT_RANDOMIZE_STACK(ThreadMessageHandler(parg));
+    try
+    {
+        vnThreadsRunning[2]++;
+        ThreadMessageHandler2(parg);
+        vnThreadsRunning[2]--;
+    }
+    catch (std::exception& e) {
+        vnThreadsRunning[2]--;
+        PrintException(&e, "ThreadMessageHandler()");
+    } catch (...) {
+        vnThreadsRunning[2]--;
+        PrintException(NULL, "ThreadMessageHandler()");
+    }
+    printf("ThreadMessageHandler exiting\n");
+}
+
+void ThreadMessageHandler2(void* parg)
+{
+    printf("ThreadMessageHandler started\n");
+    SetThreadPriority(THREAD_PRIORITY_BELOW_NORMAL);
+    while (!fShutdown)
+    {
+        vector<CNode*> vNodesCopy;
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            vNodesCopy = vNodes;
+            BOOST_FOREACH(CNode* pnode, vNodesCopy)
+                pnode->AddRef();
+        }
+
+        // Poll the connected nodes for messages
+        CNode* pnodeTrickle = NULL;
+        if (!vNodesCopy.empty())
+            pnodeTrickle = vNodesCopy[GetRand(vNodesCopy.size())];
+        BOOST_FOREACH(CNode* pnode, vNodesCopy)
+        {
+            // Receive messages
+            TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
+                ProcessMessages(pnode);
+            if (fShutdown)
+                return;
+
+            // Send messages
+            TRY_CRITICAL_BLOCK(pnode->cs_vSend)
+                SendMessages(pnode, pnode == pnodeTrickle);
+            if (fShutdown)
+                return;
+        }
+
+        CRITICAL_BLOCK(cs_vNodes)
+        {
+            BOOST_FOREACH(CNode* pnode, vNodesCopy)
+                pnode->Release();
+        }
+
+        // Wait and allow messages to bunch up.
+        // Reduce vnThreadsRunning so StopNode has permission to exit while
+        // we're sleeping, but we must always check fShutdown after doing this.
+        vnThreadsRunning[2]--;
+        Sleep(100);
+        if (fRequestShutdown)
+            Shutdown(NULL);
+        vnThreadsRunning[2]++;
+        if (fShutdown)
+            return;
+    }
+}
+
+
+
+
+
+
+
+
+
+bool BindListenPort(string& strError)
+{
+    strError = "";
+    int nOne = 1;
+    addrLocalHost.port = htons(GetDefaultPort());
+
+#ifdef __WXMSW__
+    // Initialize Windows Sockets
+    WSADATA wsadata;
+    int ret = WSAStartup(MAKEWORD(2,2), &wsadata);
+    if (ret != NO_ERROR)
+    {
+        strError = strprintf("Error: TCP/IP socket library failed to start (WSAStartup returned error %d)", ret);
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+#endif
+
+    // Create socket for listening for incoming connections
+    hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (hListenSocket == INVALID_SOCKET)
+    {
+        strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError());
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+
+#ifdef BSD
+    // Different way of disabling SIGPIPE on BSD
+    setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int));
+#endif
+
+#ifndef __WXMSW__
+    // Allow binding if the port is still in TIME_WAIT state after
+    // the program was closed and restarted.  Not an issue on windows.
+    setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
+#endif
+
+#ifdef __WXMSW__
+    // Set to nonblocking, incoming connections will also inherit this
+    if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR)
+#else
+    if (fcntl(hListenSocket, F_SETFL, O_NONBLOCK) == SOCKET_ERROR)
+#endif
+    {
+        strError = strprintf("Error: Couldn't set properties on socket for incoming connections (error %d)", WSAGetLastError());
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+
+    // The sockaddr_in structure specifies the address family,
+    // IP address, and port for the socket that is being bound
+    struct sockaddr_in sockaddr;
+    memset(&sockaddr, 0, sizeof(sockaddr));
+    sockaddr.sin_family = AF_INET;
+    sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer
+    sockaddr.sin_port = htons(GetDefaultPort());
+    if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
+    {
+        int nErr = WSAGetLastError();
+        if (nErr == WSAEADDRINUSE)
+            strError = strprintf(_("Unable to bind to port %d on this computer.  Bitcoin is probably already running."), ntohs(sockaddr.sin_port));
+        else
+            strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr);
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+    printf("Bound to port %d\n", ntohs(sockaddr.sin_port));
+
+    // Listen for incoming connections
+    if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
+    {
+        strError = strprintf("Error: Listening for incoming connections failed (listen returned error %d)", WSAGetLastError());
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+
+    return true;
+}
+
+void StartNode(void* parg)
+{
+    if (pnodeLocalHost == NULL)
+        pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress("127.0.0.1", 0, false, nLocalServices));
+
+#ifdef __WXMSW__
+    // Get local host ip
+    char pszHostName[1000] = "";
+    if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
+    {
+        vector<CAddress> vaddr;
+        if (NameLookup(pszHostName, vaddr, nLocalServices))
+            BOOST_FOREACH (const CAddress &addr, vaddr)
+                if (addr.GetByte(3) != 127)
+                {
+                    addrLocalHost = addr;
+                    break;
+                }
+    }
+#else
+    // Get local host ip
+    struct ifaddrs* myaddrs;
+    if (getifaddrs(&myaddrs) == 0)
+    {
+        for (struct ifaddrs* ifa = myaddrs; ifa != NULL; ifa = ifa->ifa_next)
+        {
+            if (ifa->ifa_addr == NULL) continue;
+            if ((ifa->ifa_flags & IFF_UP) == 0) continue;
+            if (strcmp(ifa->ifa_name, "lo") == 0) continue;
+            if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
+            char pszIP[100];
+            if (ifa->ifa_addr->sa_family == AF_INET)
+            {
+                struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
+                if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL)
+                    printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP);
+
+                // Take the first IP that isn't loopback 127.x.x.x
+                CAddress addr(*(unsigned int*)&s4->sin_addr, 0, nLocalServices);
+                if (addr.IsValid() && addr.GetByte(3) != 127)
+                {
+                    addrLocalHost = addr;
+                    break;
+                }
+            }
+            else if (ifa->ifa_addr->sa_family == AF_INET6)
+            {
+                struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
+                if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL)
+                    printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP);
+            }
+        }
+        freeifaddrs(myaddrs);
+    }
+#endif
+    printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
+
+    if (fUseProxy || mapArgs.count("-connect") || fNoListen)
+    {
+        // Proxies can't take incoming connections
+        addrLocalHost.ip = CAddress("0.0.0.0").ip;
+        printf("addrLocalHost = %s\n", addrLocalHost.ToString().c_str());
+    }
+    else
+    {
+        CreateThread(ThreadGetMyExternalIP, NULL);
+    }
+
+    //
+    // Start threads
+    //
+
+    // Map ports with UPnP
+    if (fHaveUPnP)
+        MapPort(fUseUPnP);
+
+    // Get addresses from IRC and advertise ours
+    if (!CreateThread(ThreadIRCSeed, NULL))
+        printf("Error: CreateThread(ThreadIRCSeed) failed\n");
+
+    // Send and receive from sockets, accept connections
+    pthread_t hThreadSocketHandler = CreateThread(ThreadSocketHandler, NULL, true);
+
+    // Initiate outbound connections
+    if (!CreateThread(ThreadOpenConnections, NULL))
+        printf("Error: CreateThread(ThreadOpenConnections) failed\n");
+
+    // Process messages
+    if (!CreateThread(ThreadMessageHandler, NULL))
+        printf("Error: CreateThread(ThreadMessageHandler) failed\n");
+
+    // Generate coins in the background
+    GenerateBitcoins(fGenerateBitcoins);
+}
+
+bool StopNode()
+{
+    printf("StopNode()\n");
+    fShutdown = true;
+    nTransactionsUpdated++;
+    int64 nStart = GetTime();
+    while (vnThreadsRunning[0] > 0 || vnThreadsRunning[2] > 0 || vnThreadsRunning[3] > 0 || vnThreadsRunning[4] > 0
+#ifdef USE_UPNP
+        || vnThreadsRunning[5] > 0
+#endif
+    )
+    {
+        if (GetTime() - nStart > 20)
+            break;
+        Sleep(20);
+    }
+    if (vnThreadsRunning[0] > 0) printf("ThreadSocketHandler still running\n");
+    if (vnThreadsRunning[1] > 0) printf("ThreadOpenConnections still running\n");
+    if (vnThreadsRunning[2] > 0) printf("ThreadMessageHandler still running\n");
+    if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n");
+    if (vnThreadsRunning[4] > 0) printf("ThreadRPCServer still running\n");
+    if (fHaveUPnP && vnThreadsRunning[5] > 0) printf("ThreadMapPort still running\n");
+    while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
+        Sleep(20);
+    Sleep(50);
+
+    return true;
+}
+
+class CNetCleanup
+{
+public:
+    CNetCleanup()
+    {
+    }
+    ~CNetCleanup()
+    {
+        // Close sockets
+        BOOST_FOREACH(CNode* pnode, vNodes)
+            if (pnode->hSocket != INVALID_SOCKET)
+                closesocket(pnode->hSocket);
+        if (hListenSocket != INVALID_SOCKET)
+            if (closesocket(hListenSocket) == SOCKET_ERROR)
+                printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
+
+#ifdef __WXMSW__
+        // Shutdown Windows Sockets
+        WSACleanup();
+#endif
+    }
+}
+instance_of_cnetcleanup;