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bitcoin/net.cpp

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// 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"
static const int MAX_OUTBOUND_CONNECTIONS = 8;
void ThreadMessageHandler2(void* parg);
void ThreadSocketHandler2(void* parg);
void ThreadOpenConnections2(void* parg);
bool OpenNetworkConnection(const CAddress& addrConnect);
//
// Global state variables
//
bool fClient = false;
uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
CAddress addrLocalHost(0, 0, 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.ToStringLog().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.ToStringLog().c_str());
}
hSocketRet = hSocket;
return true;
}
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.c_str());
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)
{
struct hostent* phostent = gethostbyname("checkip.dyndns.org");
if (phostent && phostent->h_addr_list && phostent->h_addr_list[0])
addrConnect = CAddress(*(u_long*)phostent->h_addr_list[0], htons(80));
}
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)
{
struct hostent* phostent = gethostbyname("www.showmyip.com");
if (phostent && phostent->h_addr_list && phostent->h_addr_list[0])
addrConnect = CAddress(*(u_long*)phostent->h_addr_list[0], htons(80));
}
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)
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.ToStringLog().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)
{
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)
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)
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)
foreach(CNode* pnode, vNodes)
if (pnode != this)
pnode->PushMessage("sub-cancel", nChannel);
}
}
CNode* FindNode(unsigned int ip)
{
CRITICAL_BLOCK(cs_vNodes)
{
foreach(CNode* pnode, vNodes)
if (pnode->addr.ip == ip)
return (pnode);
}
return NULL;
}
CNode* FindNode(CAddress addr)
{
CRITICAL_BLOCK(cs_vNodes)
{
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.ToStringLog().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.ToStringLog().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.ToStringLog().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;
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;
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;
FD_SET(hListenSocket, &fdsetRecv);
hSocketMax = max(hSocketMax, hListenSocket);
CRITICAL_BLOCK(cs_vNodes)
{
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 (FD_ISSET(hListenSocket, &fdsetRecv))
{
struct sockaddr_in sockaddr;
socklen_t len = sizeof(sockaddr);
SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
CAddress addr(sockaddr);
if (hSocket == INVALID_SOCKET)
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
printf("socket error accept failed: %d\n", WSAGetLastError());
}
else if (mapArgs.count("-maxconnections") && (int)vNodes.size() >= atoi(mapArgs["-maxconnections"]) - MAX_OUTBOUND_CONNECTIONS)
{
closesocket(hSocket);
}
else
{
printf("accepted connection %s\n", addr.ToStringLog().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;
foreach(CNode* pnode, vNodesCopy)
pnode->AddRef();
}
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();
// 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();
}
}
}
}
}
//
// 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)
{
foreach(CNode* pnode, vNodesCopy)
pnode->Release();
}
Sleep(10);
}
}
unsigned int pnSeed[] =
{
// 2010/06
0x35218252, 0x9c9c9618, 0xda6bacad, 0xb9aca862, 0x97c235c6,
0x146f9562, 0xb67b9e4b, 0x87cf4bc0, 0xb83945d0, 0x984333ad,
0xbbeec555, 0x6f0eb440, 0xe0005318, 0x7797e460, 0xddc60fcc,
0xb3bbd24a, 0x1ac85746, 0x641846a6, 0x85ee1155, 0xbb2e7a4c,
0x9cb8514b, 0xfc342648, 0x62958fae, 0xd0a8c87a, 0xa800795b,
0xda8c814e, 0x256a0c80, 0x3f23ec63, 0xd565df43, 0x997d9044,
0xaa121448, 0xbed8688e, 0x59d09a5e, 0xb2931243, 0x3730ba18,
0xdd3462d0, 0x4e4d1448, 0x171df645, 0x84ee1155,
0x248ac445, 0x0e634444, 0x0ded1b63, 0x30c01e60,
0xa2b9a094, 0x29e4fd43, 0x9ce61b4c, 0xdae09744,
// 2010/08
0x5ae6bf43, 0x460be257, 0x7245c0cf, 0x4e0f028d, 0x26501760, 0x38643255, 0x67094f4f, 0x480449b8,
0x16545143, 0x1f082e5a, 0xaa428018, 0xe411e793, 0x14c1f862, 0x2726105b, 0x9b33ea50, 0xeeef86ca,
0xe3210d44, 0x0dca8b63, 0x3f9dfb18, 0x860340ad, 0xf33ba17a, 0x9018375c, 0x1de4e353, 0x0fa52dcb,
0x89c4555b, 0x109cf37b, 0x28c55b40, 0x04c801ae, 0x275c1e80, 0x6f7f745d, 0x7a2a5653, 0xa28e26d8,
0xa4e65db2, 0x99a06580, 0xf253ba44, 0x82cf6ab8, 0x859c2e8e, 0xf71a815d, 0xc18f1454, 0x71c8a943,
0x90d24e18, 0x311789b2, 0x74aba645, 0xde0bbfc3, 0xad724fad, 0xbf1ae15e, 0xbaa6fb54, 0x06e4d145,
0x51528645, 0x72120cd4, 0xd4cfd145, 0x0a7afed8, 0x9b9a5fad, 0x9e9ff45e, 0x10128355, 0xd44e8646,
0x04a07b47, 0x5fc9d547, 0xe0491e45, 0xbac21b41, 0x7aa31bae, 0x10483c5f, 0x94a23055, 0x73d9dc47,
0x1a99c247, 0x822fe847, 0x7e57ba48, 0xb19ea843, 0xa60621b2, 0x778cf163, 0x125c6556, 0xf94ba44f,
0xa61a0948, 0x6c839e4b, 0x29af5348, 0x68d84845, 0x752b95c3, 0xcf0d4663, 0x08e11e56, 0x75109550,
0x5f24b94c, 0x42426d4d, 0xfbbc0a4c, 0x70a9a246, 0xda7837cb, 0xae2a986d, 0xe283c358, 0x0c7ca954,
0x8e9bde59, 0x61521760, 0x6884444c, 0xa194e548, 0x9b8809cc, 0x16e96a8f, 0x956ff859, 0xfad5e555,
0x0ea70c80, 0x5b4ce26d, 0x7984444c, 0x1080d24a, 0x22a686cf, 0x6bf8c2ad, 0xb0f7485f, 0x06b66e56,
0x668373bc, 0x75506279, 0x3868694e, 0x12a5954b, 0x3a8b62d1, 0xb74fcbad, 0xa7dc3360, 0xc070b359,
0xa2b87242, 0xc45cab7c, 0x69882050, 0x14a5464b, 0x386acad5, 0x80b85db2, 0x1f78a062, 0xc608c55b,
0x4257d543, 0x7636ad80, 0x4432d655, 0xb2114d4b, 0x32639bd9, 0xadd75db2, 0x9be5a362, 0x6831bc5e,
0xf7f77046, 0x8f35ba81, 0x09bb4e59, 0xd0fb6b4e, 0xc5daa445, 0x9c611618, 0x355dcc62, 0xf2cf435e,
0x31e72c46, 0xdd8a43ad, 0x171f9c5b, 0xb4c2e355, 0xbe8af945, 0x613d3942, 0xe6f9e863, 0x7a3d855f,
0xa66adc47, 0x261089b2, 0x5a27105b, 0x6c28105b, 0xdd247946, 0xe6c3a445, 0x43a1ec63, 0x99b4dd5f,
0xb6834347, 0x5e9649bc, 0xf9dd545d, 0x6ae4c15b, 0xa5318a47, 0x7984ec47, 0x93a73b63, 0x0c60195f,
0xa5c85e4b, 0xa0a36dc2, 0x0739a95e, 0x3d44c15b, 0xfb940f4b, 0xd67c9148, 0x614f9876, 0x0a241c5f,
0xad9da74c, 0x4459abc8, 0x12e71b5f, 0x1c534a5d, 0x8ff5fc50, 0x2ca8864b, 0xd894fd80, 0x82ab3160,
0x390d804e, 0x2cf310cc, 0x680dad80, 0x691be15e, 0x5a8f4652, 0xaad0784d, 0x0d2431ad,
};
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++)
{
foreach(string strAddr, mapMultiArgs["-connect"])
{
CAddress addr(strAddr, NODE_NETWORK);
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"))
{
foreach(string strAddr, mapMultiArgs["-addnode"])
{
CAddress addr(strAddr, NODE_NETWORK);
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)
foreach(CNode* pnode, vNodes)
if (!pnode->fInbound)
nOutbound++;
int nMaxOutboundConnections = MAX_OUTBOUND_CONNECTIONS;
if (mapArgs.count("-maxconnections"))
nMaxOutboundConnections = min(nMaxOutboundConnections, atoi(mapArgs["-maxconnections"]));
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)
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)
{
foreach(PAIRTYPE(const vector<unsigned char>, CAddress)& item, mapAddresses)
{
if (setSeed.count(item.second.ip))
{
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)
foreach(CNode* pnode, vNodes)
setConnected.insert(pnode->addr.ip & 0x0000ffff);
CRITICAL_BLOCK(cs_mapAddresses)
{
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 != 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;
foreach(CNode* pnode, vNodesCopy)
pnode->AddRef();
}
// Poll the connected nodes for messages
CNode* pnodeTrickle = NULL;
if (!vNodesCopy.empty())
pnodeTrickle = vNodesCopy[GetRand(vNodesCopy.size())];
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)
{
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 = 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 = 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", nLocalServices));
#ifdef __WXMSW__
// Get local host ip
char pszHostName[1000] = "";
if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
{
struct hostent* phostent = gethostbyname(pszHostName);
if (phostent)
{
// Take the first IP that isn't loopback 127.x.x.x
for (int i = 0; phostent->h_addr_list[i] != NULL; i++)
printf("host ip %d: %s\n", i, CAddress(*(unsigned int*)phostent->h_addr_list[i]).ToStringIP().c_str());
for (int i = 0; phostent->h_addr_list[i] != NULL; i++)
{
CAddress addr(*(unsigned int*)phostent->h_addr_list[i], GetDefaultPort(), nLocalServices);
if (addr.IsValid() && 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, GetDefaultPort(), 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"))
{
// 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
//
// 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)
{
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");
while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
Sleep(20);
Sleep(50);
return true;
}
class CNetCleanup
{
public:
CNetCleanup()
{
}
~CNetCleanup()
{
// Close sockets
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;
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