// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#if defined(HAVE_CONFIG_H)
#include "config/bitcoin-config.h"
#endif
#include "net.h"
#include "addrman.h"
#include "chainparams.h"
#include "clientversion.h"
#include "consensus/consensus.h"
#include "crypto/common.h"
#include "crypto/sha256.h"
#include "hash.h"
#include "primitives/transaction.h"
#include "netbase.h"
#include "scheduler.h"
#include "ui_interface.h"
#include "utilstrencodings.h"
#ifdef WIN32
#include <string.h>
#else
#include <fcntl.h>
#endif
#ifdef USE_UPNP
#include <miniupnpc/miniupnpc.h>
#include <miniupnpc/miniwget.h>
#include <miniupnpc/upnpcommands.h>
#include <miniupnpc/upnperrors.h>
#endif
#include <boost/filesystem.hpp>
#include <boost/thread.hpp>
#include <math.h>
// Dump addresses to peers.dat and banlist.dat every 15 minutes (900s)
#define DUMP_ADDRESSES_INTERVAL 900
// We add a random period time (0 to 1 seconds) to feeler connections to prevent synchronization.
#define FEELER_SLEEP_WINDOW 1
#if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
// Fix for ancient MinGW versions, that don't have defined these in ws2tcpip.h.
// Todo: Can be removed when our pull-tester is upgraded to a modern MinGW version.
#ifdef WIN32
#ifndef PROTECTION_LEVEL_UNRESTRICTED
#define PROTECTION_LEVEL_UNRESTRICTED 10
#endif
#ifndef IPV6_PROTECTION_LEVEL
#define IPV6_PROTECTION_LEVEL 23
#endif
#endif
namespace {
const int MAX_OUTBOUND_CONNECTIONS = 8;
const int MAX_FEELER_CONNECTIONS = 1;
struct ListenSocket {
SOCKET socket;
bool whitelisted;
ListenSocket(SOCKET socket, bool whitelisted) : socket(socket), whitelisted(whitelisted) {}
};
}
const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
/** Services this node implementation cares about */
ServiceFlags nRelevantServices = NODE_NETWORK;
//
// Global state variables
//
bool fDiscover = true;
bool fListen = true;
ServiceFlags nLocalServices = NODE_NETWORK;
bool fRelayTxes = true;
CCriticalSection cs_mapLocalHost;
std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
static bool vfLimited[NET_MAX] = {};
static CNode* pnodeLocalHost = NULL;
uint64_t nLocalHostNonce = 0;
static std::vector<ListenSocket> vhListenSocket;
CAddrMan addrman;
int nMaxConnections = DEFAULT_MAX_PEER_CONNECTIONS;
bool fAddressesInitialized = false;
std::string strSubVersion;
std::vector<CNode*> vNodes;
CCriticalSection cs_vNodes;
limitedmap<uint256, int64_t> mapAlreadyAskedFor(MAX_INV_SZ);
static std::deque<std::string> vOneShots;
CCriticalSection cs_vOneShots;
std::vector<std::string> vAddedNodes;
CCriticalSection cs_vAddedNodes;
NodeId nLastNodeId = 0;
CCriticalSection cs_nLastNodeId;
static CSemaphore *semOutbound = NULL;
boost::condition_variable messageHandlerCondition;
// Signals for message handling
static CNodeSignals g_signals;
CNodeSignals& GetNodeSignals() { return g_signals; }
void AddOneShot(const std::string& strDest)
{
LOCK(cs_vOneShots);
vOneShots.push_back(strDest);
}
unsigned short GetListenPort()
{
return (unsigned short)(GetArg("-port", Params().GetDefaultPort()));
}
// find 'best' local address for a particular peer
bool GetLocal(CService& addr, const CNetAddr *paddrPeer)
{
if (!fListen)
return false;
int nBestScore = -1;
int nBestReachability = -1;
{
LOCK(cs_mapLocalHost);
for (std::map<CNetAddr, LocalServiceInfo>::iterator it = mapLocalHost.begin(); it != mapLocalHost.end(); it++)
{
int nScore = (*it).second.nScore;
int nReachability = (*it).first.GetReachabilityFrom(paddrPeer);
if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore))
{
addr = CService((*it).first, (*it).second.nPort);
nBestReachability = nReachability;
nBestScore = nScore;
}
}
}
return nBestScore >= 0;
}
//! Convert the pnSeeds6 array into usable address objects.
static std::vector<CAddress> convertSeed6(const std::vector<SeedSpec6> &vSeedsIn)
{
// It'll only connect to one or two seed nodes because once it connects,
// it'll get a pile of addresses with newer timestamps.
// Seed nodes are given a random 'last seen time' of between one and two
// weeks ago.
const int64_t nOneWeek = 7*24*60*60;
std::vector<CAddress> vSeedsOut;
vSeedsOut.reserve(vSeedsIn.size());
for (std::vector<SeedSpec6>::const_iterator i(vSeedsIn.begin()); i != vSeedsIn.end(); ++i)
{
struct in6_addr ip;
memcpy(&ip, i->addr, sizeof(ip));
CAddress addr(CService(ip, i->port), NODE_NETWORK);
addr.nTime = GetTime() - GetRand(nOneWeek) - nOneWeek;
vSeedsOut.push_back(addr);
}
return vSeedsOut;
}
// get best local address for a particular peer as a CAddress
// Otherwise, return the unroutable 0.0.0.0 but filled in with
// the normal parameters, since the IP may be changed to a useful
// one by discovery.
CAddress GetLocalAddress(const CNetAddr *paddrPeer)
{
CAddress ret(CService(CNetAddr(),GetListenPort()), NODE_NONE);
CService addr;
if (GetLocal(addr, paddrPeer))
{
ret = CAddress(addr, nLocalServices);
}
ret.nTime = GetAdjustedTime();
return ret;
}
int GetnScore(const CService& addr)
{
LOCK(cs_mapLocalHost);
if (mapLocalHost.count(addr) == LOCAL_NONE)
return 0;
return mapLocalHost[addr].nScore;
}
// Is our peer's addrLocal potentially useful as an external IP source?
bool IsPeerAddrLocalGood(CNode *pnode)
{
return fDiscover && pnode->addr.IsRoutable() && pnode->addrLocal.IsRoutable() &&
!IsLimited(pnode->addrLocal.GetNetwork());
}
// pushes our own address to a peer
void AdvertiseLocal(CNode *pnode)
{
if (fListen && pnode->fSuccessfullyConnected)
{
CAddress addrLocal = GetLocalAddress(&pnode->addr);
// If discovery is enabled, sometimes give our peer the address it
// tells us that it sees us as in case it has a better idea of our
// address than we do.
if (IsPeerAddrLocalGood(pnode) && (!addrLocal.IsRoutable() ||
GetRand((GetnScore(addrLocal) > LOCAL_MANUAL) ? 8:2) == 0))
{
addrLocal.SetIP(pnode->addrLocal);
}
if (addrLocal.IsRoutable())
{
LogPrint("net", "AdvertiseLocal: advertising address %s\n", addrLocal.ToString());
pnode->PushAddress(addrLocal);
}
}
}
// learn a new local address
bool AddLocal(const CService& addr, int nScore)
{
if (!addr.IsRoutable())
return false;
if (!fDiscover && nScore < LOCAL_MANUAL)
return false;
if (IsLimited(addr))
return false;
LogPrintf("AddLocal(%s,%i)\n", addr.ToString(), nScore);
{
LOCK(cs_mapLocalHost);
bool fAlready = mapLocalHost.count(addr) > 0;
LocalServiceInfo &info = mapLocalHost[addr];
if (!fAlready || nScore >= info.nScore) {
info.nScore = nScore + (fAlready ? 1 : 0);
info.nPort = addr.GetPort();
}
}
return true;
}
bool AddLocal(const CNetAddr &addr, int nScore)
{
return AddLocal(CService(addr, GetListenPort()), nScore);
}
bool RemoveLocal(const CService& addr)
{
LOCK(cs_mapLocalHost);
LogPrintf("RemoveLocal(%s)\n", addr.ToString());
mapLocalHost.erase(addr);
return true;
}
/** Make a particular network entirely off-limits (no automatic connects to it) */
void SetLimited(enum Network net, bool fLimited)
{
if (net == NET_UNROUTABLE)
return;
LOCK(cs_mapLocalHost);
vfLimited[net] = fLimited;
}
bool IsLimited(enum Network net)
{
LOCK(cs_mapLocalHost);
return vfLimited[net];
}
bool IsLimited(const CNetAddr &addr)
{
return IsLimited(addr.GetNetwork());
}
/** vote for a local address */
bool SeenLocal(const CService& addr)
{
{
LOCK(cs_mapLocalHost);
if (mapLocalHost.count(addr) == 0)
return false;
mapLocalHost[addr].nScore++;
}
return true;
}
/** check whether a given address is potentially local */
bool IsLocal(const CService& addr)
{
LOCK(cs_mapLocalHost);
return mapLocalHost.count(addr) > 0;
}
/** check whether a given network is one we can probably connect to */
bool IsReachable(enum Network net)
{
LOCK(cs_mapLocalHost);
return !vfLimited[net];
}
/** check whether a given address is in a network we can probably connect to */
bool IsReachable(const CNetAddr& addr)
{
enum Network net = addr.GetNetwork();
return IsReachable(net);
}
void AddressCurrentlyConnected(const CService& addr)
{
addrman.Connected(addr);
}
uint64_t CNode::nTotalBytesRecv = 0;
uint64_t CNode::nTotalBytesSent = 0;
CCriticalSection CNode::cs_totalBytesRecv;
CCriticalSection CNode::cs_totalBytesSent;
uint64_t CNode::nMaxOutboundLimit = 0;
uint64_t CNode::nMaxOutboundTotalBytesSentInCycle = 0;
uint64_t CNode::nMaxOutboundTimeframe = 60*60*24; //1 day
uint64_t CNode::nMaxOutboundCycleStartTime = 0;
CNode* FindNode(const CNetAddr& ip)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if ((CNetAddr)pnode->addr == ip)
return (pnode);
return NULL;
}
CNode* FindNode(const CSubNet& subNet)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if (subNet.Match((CNetAddr)pnode->addr))
return (pnode);
return NULL;
}
CNode* FindNode(const std::string& addrName)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode->addrName == addrName)
return (pnode);
return NULL;
}
CNode* FindNode(const CService& addr)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if ((CService)pnode->addr == addr)
return (pnode);
return NULL;
}
//TODO: This is used in only one place in main, and should be removed
CNode* FindNode(const NodeId nodeid)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode->GetId() == nodeid)
return (pnode);
return NULL;
}
CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure)
{
if (pszDest == NULL) {
if (IsLocal(addrConnect))
return NULL;
// Look for an existing connection
CNode* pnode = FindNode((CService)addrConnect);
if (pnode)
{
pnode->AddRef();
return pnode;
}
}
/// debug print
LogPrint("net", "trying connection %s lastseen=%.1fhrs\n",
pszDest ? pszDest : addrConnect.ToString(),
pszDest ? 0.0 : (double)(GetAdjustedTime() - addrConnect.nTime)/3600.0);
// Connect
SOCKET hSocket;
bool proxyConnectionFailed = false;
if (pszDest ? ConnectSocketByName(addrConnect, hSocket, pszDest, Params().GetDefaultPort(), nConnectTimeout, &proxyConnectionFailed) :
ConnectSocket(addrConnect, hSocket, nConnectTimeout, &proxyConnectionFailed))
{
if (!IsSelectableSocket(hSocket)) {
LogPrintf("Cannot create connection: non-selectable socket created (fd >= FD_SETSIZE ?)\n");
CloseSocket(hSocket);
return NULL;
}
if (pszDest && addrConnect.IsValid()) {
// It is possible that we already have a connection to the IP/port pszDest resolved to.
// In that case, drop the connection that was just created, and return the existing CNode instead.
// Also store the name we used to connect in that CNode, so that future FindNode() calls to that
// name catch this early.
CNode* pnode = FindNode((CService)addrConnect);
if (pnode)
{
pnode->AddRef();
{
LOCK(cs_vNodes);
if (pnode->addrName.empty()) {
pnode->addrName = std::string(pszDest);
}
}
CloseSocket(hSocket);
return pnode;
}
}
addrman.Attempt(addrConnect, fCountFailure);
// Add node
CNode* pnode = new CNode(hSocket, addrConnect, pszDest ? pszDest : "", false);
pnode->AddRef();
{
LOCK(cs_vNodes);
vNodes.push_back(pnode);
}
pnode->nServicesExpected = ServiceFlags(addrConnect.nServices & nRelevantServices);
pnode->nTimeConnected = GetTime();
return pnode;
} else if (!proxyConnectionFailed) {
// If connecting to the node failed, and failure is not caused by a problem connecting to
// the proxy, mark this as an attempt.
addrman.Attempt(addrConnect, fCountFailure);
}
return NULL;
}
static void DumpBanlist()
{
CNode::SweepBanned(); // clean unused entries (if bantime has expired)
if (!CNode::BannedSetIsDirty())
return;
int64_t nStart = GetTimeMillis();
CBanDB bandb;
banmap_t banmap;
CNode::SetBannedSetDirty(false);
CNode::GetBanned(banmap);
if (!bandb.Write(banmap))
CNode::SetBannedSetDirty(true);
LogPrint("net", "Flushed %d banned node ips/subnets to banlist.dat %dms\n",
banmap.size(), GetTimeMillis() - nStart);
}
void CNode::CloseSocketDisconnect()
{
fDisconnect = true;
if (hSocket != INVALID_SOCKET)
{
LogPrint("net", "disconnecting peer=%d\n", id);
CloseSocket(hSocket);
}
// in case this fails, we'll empty the recv buffer when the CNode is deleted
TRY_LOCK(cs_vRecvMsg, lockRecv);
if (lockRecv)
vRecvMsg.clear();
}
void CNode::PushVersion()
{
int nBestHeight = GetNodeSignals().GetHeight().get_value_or(0);
int64_t nTime = (fInbound ? GetAdjustedTime() : GetTime());
CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService(), addr.nServices));
CAddress addrMe = GetLocalAddress(&addr);
GetRandBytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
if (fLogIPs)
LogPrint("net", "send version message: version %d, blocks=%d, us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nBestHeight, addrMe.ToString(), addrYou.ToString(), id);
else
LogPrint("net", "send version message: version %d, blocks=%d, us=%s, peer=%d\n", PROTOCOL_VERSION, nBestHeight, addrMe.ToString(), id);
PushMessage(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalServices, nTime, addrYou, addrMe,
nLocalHostNonce, strSubVersion, nBestHeight, ::fRelayTxes);
}
banmap_t CNode::setBanned;
CCriticalSection CNode::cs_setBanned;
bool CNode::setBannedIsDirty;
void CNode::ClearBanned()
{
{
LOCK(cs_setBanned);
setBanned.clear();
setBannedIsDirty = true;
}
DumpBanlist(); //store banlist to disk
uiInterface.BannedListChanged();
}
bool CNode::IsBanned(CNetAddr ip)
{
bool fResult = false;
{
LOCK(cs_setBanned);
for (banmap_t::iterator it = setBanned.begin(); it != setBanned.end(); it++)
{
CSubNet subNet = (*it).first;
CBanEntry banEntry = (*it).second;
if(subNet.Match(ip) && GetTime() < banEntry.nBanUntil)
fResult = true;
}
}
return fResult;
}
bool CNode::IsBanned(CSubNet subnet)
{
bool fResult = false;
{
LOCK(cs_setBanned);
banmap_t::iterator i = setBanned.find(subnet);
if (i != setBanned.end())
{
CBanEntry banEntry = (*i).second;
if (GetTime() < banEntry.nBanUntil)
fResult = true;
}
}
return fResult;
}
void CNode::Ban(const CNetAddr& addr, const BanReason &banReason, int64_t bantimeoffset, bool sinceUnixEpoch) {
CSubNet subNet(addr);
Ban(subNet, banReason, bantimeoffset, sinceUnixEpoch);
}
void CNode::Ban(const CSubNet& subNet, const BanReason &banReason, int64_t bantimeoffset, bool sinceUnixEpoch) {
CBanEntry banEntry(GetTime());
banEntry.banReason = banReason;
if (bantimeoffset <= 0)
{
bantimeoffset = GetArg("-bantime", DEFAULT_MISBEHAVING_BANTIME);
sinceUnixEpoch = false;
}
banEntry.nBanUntil = (sinceUnixEpoch ? 0 : GetTime() )+bantimeoffset;
{
LOCK(cs_setBanned);
if (setBanned[subNet].nBanUntil < banEntry.nBanUntil) {
setBanned[subNet] = banEntry;
setBannedIsDirty = true;
}
else
return;
}
uiInterface.BannedListChanged();
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes) {
if (subNet.Match((CNetAddr)pnode->addr))
pnode->fDisconnect = true;
}
}
if(banReason == BanReasonManuallyAdded)
DumpBanlist(); //store banlist to disk immediately if user requested ban
}
bool CNode::Unban(const CNetAddr &addr) {
CSubNet subNet(addr);
return Unban(subNet);
}
bool CNode::Unban(const CSubNet &subNet) {
{
LOCK(cs_setBanned);
if (!setBanned.erase(subNet))
return false;
setBannedIsDirty = true;
}
uiInterface.BannedListChanged();
DumpBanlist(); //store banlist to disk immediately
return true;
}
void CNode::GetBanned(banmap_t &banMap)
{
LOCK(cs_setBanned);
banMap = setBanned; //create a thread safe copy
}
void CNode::SetBanned(const banmap_t &banMap)
{
LOCK(cs_setBanned);
setBanned = banMap;
setBannedIsDirty = true;
}
void CNode::SweepBanned()
{
int64_t now = GetTime();
LOCK(cs_setBanned);
banmap_t::iterator it = setBanned.begin();
while(it != setBanned.end())
{
CSubNet subNet = (*it).first;
CBanEntry banEntry = (*it).second;
if(now > banEntry.nBanUntil)
{
setBanned.erase(it++);
setBannedIsDirty = true;
LogPrint("net", "%s: Removed banned node ip/subnet from banlist.dat: %s\n", __func__, subNet.ToString());
}
else
++it;
}
}
bool CNode::BannedSetIsDirty()
{
LOCK(cs_setBanned);
return setBannedIsDirty;
}
void CNode::SetBannedSetDirty(bool dirty)
{
LOCK(cs_setBanned); //reuse setBanned lock for the isDirty flag
setBannedIsDirty = dirty;
}
std::vector<CSubNet> CNode::vWhitelistedRange;
CCriticalSection CNode::cs_vWhitelistedRange;
bool CNode::IsWhitelistedRange(const CNetAddr &addr) {
LOCK(cs_vWhitelistedRange);
BOOST_FOREACH(const CSubNet& subnet, vWhitelistedRange) {
if (subnet.Match(addr))
return true;
}
return false;
}
void CNode::AddWhitelistedRange(const CSubNet &subnet) {
LOCK(cs_vWhitelistedRange);
vWhitelistedRange.push_back(subnet);
}
#undef X
#define X(name) stats.name = name
void CNode::copyStats(CNodeStats &stats)
{
stats.nodeid = this->GetId();
X(nServices);
X(fRelayTxes);
X(nLastSend);
X(nLastRecv);
X(nTimeConnected);
X(nTimeOffset);
X(addrName);
X(nVersion);
X(cleanSubVer);
X(fInbound);
X(nStartingHeight);
X(nSendBytes);
X(mapSendBytesPerMsgCmd);
X(nRecvBytes);
X(mapRecvBytesPerMsgCmd);
X(fWhitelisted);
// It is common for nodes with good ping times to suddenly become lagged,
// due to a new block arriving or other large transfer.
// Merely reporting pingtime might fool the caller into thinking the node was still responsive,
// since pingtime does not update until the ping is complete, which might take a while.
// So, if a ping is taking an unusually long time in flight,
// the caller can immediately detect that this is happening.
int64_t nPingUsecWait = 0;
if ((0 != nPingNonceSent) && (0 != nPingUsecStart)) {
nPingUsecWait = GetTimeMicros() - nPingUsecStart;
}
// Raw ping time is in microseconds, but show it to user as whole seconds (Bitcoin users should be well used to small numbers with many decimal places by now :)
stats.dPingTime = (((double)nPingUsecTime) / 1e6);
stats.dPingMin = (((double)nMinPingUsecTime) / 1e6);
stats.dPingWait = (((double)nPingUsecWait) / 1e6);
// Leave string empty if addrLocal invalid (not filled in yet)
stats.addrLocal = addrLocal.IsValid() ? addrLocal.ToString() : "";
}
#undef X
// requires LOCK(cs_vRecvMsg)
bool CNode::ReceiveMsgBytes(const char *pch, unsigned int nBytes)
{
while (nBytes > 0) {
// get current incomplete message, or create a new one
if (vRecvMsg.empty() ||
vRecvMsg.back().complete())
vRecvMsg.push_back(CNetMessage(Params().MessageStart(), SER_NETWORK, nRecvVersion));
CNetMessage& msg = vRecvMsg.back();
// absorb network data
int handled;
if (!msg.in_data)
handled = msg.readHeader(pch, nBytes);
else
handled = msg.readData(pch, nBytes);
if (handled < 0)
return false;
if (msg.in_data && msg.hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
LogPrint("net", "Oversized message from peer=%i, disconnecting\n", GetId());
return false;
}
pch += handled;
nBytes -= handled;
if (msg.complete()) {
//store received bytes per message command
//to prevent a memory DOS, only allow valid commands
mapMsgCmdSize::iterator i = mapRecvBytesPerMsgCmd.find(msg.hdr.pchCommand);
if (i == mapRecvBytesPerMsgCmd.end())
i = mapRecvBytesPerMsgCmd.find(NET_MESSAGE_COMMAND_OTHER);
assert(i != mapRecvBytesPerMsgCmd.end());
i->second += msg.hdr.nMessageSize + CMessageHeader::HEADER_SIZE;
msg.nTime = GetTimeMicros();
messageHandlerCondition.notify_one();
}
}
return true;
}
int CNetMessage::readHeader(const char *pch, unsigned int nBytes)
{
// copy data to temporary parsing buffer
unsigned int nRemaining = 24 - nHdrPos;
unsigned int nCopy = std::min(nRemaining, nBytes);
memcpy(&hdrbuf[nHdrPos], pch, nCopy);
nHdrPos += nCopy;
// if header incomplete, exit
if (nHdrPos < 24)
return nCopy;
// deserialize to CMessageHeader
try {
hdrbuf >> hdr;
}
catch (const std::exception&) {
return -1;
}
// reject messages larger than MAX_SIZE
if (hdr.nMessageSize > MAX_SIZE)
return -1;
// switch state to reading message data
in_data = true;
return nCopy;
}
int CNetMessage::readData(const char *pch, unsigned int nBytes)
{
unsigned int nRemaining = hdr.nMessageSize - nDataPos;
unsigned int nCopy = std::min(nRemaining, nBytes);
if (vRecv.size() < nDataPos + nCopy) {
// Allocate up to 256 KiB ahead, but never more than the total message size.
vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
}
memcpy(&vRecv[nDataPos], pch, nCopy);
nDataPos += nCopy;
return nCopy;
}
// requires LOCK(cs_vSend)
void SocketSendData(CNode *pnode)
{
std::deque<CSerializeData>::iterator it = pnode->vSendMsg.begin();
while (it != pnode->vSendMsg.end()) {
const CSerializeData &data = *it;
assert(data.size() > pnode->nSendOffset);
int nBytes = send(pnode->hSocket, &data[pnode->nSendOffset], data.size() - pnode->nSendOffset, MSG_NOSIGNAL | MSG_DONTWAIT);
if (nBytes > 0) {
pnode->nLastSend = GetTime();
pnode->nSendBytes += nBytes;
pnode->nSendOffset += nBytes;
pnode->RecordBytesSent(nBytes);
if (pnode->nSendOffset == data.size()) {
pnode->nSendOffset = 0;
pnode->nSendSize -= data.size();
it++;
} else {
// could not send full message; stop sending more
break;
}
} else {
if (nBytes < 0) {
// error
int nErr = WSAGetLastError();
if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
{
LogPrintf("socket send error %s\n", NetworkErrorString(nErr));
pnode->CloseSocketDisconnect();
}
}
// couldn't send anything at all
break;
}
}
if (it == pnode->vSendMsg.end()) {
assert(pnode->nSendOffset == 0);
assert(pnode->nSendSize == 0);
}
pnode->vSendMsg.erase(pnode->vSendMsg.begin(), it);
}
static std::list<CNode*> vNodesDisconnected;
struct NodeEvictionCandidate
{
NodeId id;
int64_t nTimeConnected;
int64_t nMinPingUsecTime;
int64_t nLastBlockTime;
int64_t nLastTXTime;
bool fNetworkNode;
bool fRelayTxes;
bool fBloomFilter;
CAddress addr;
uint64_t nKeyedNetGroup;
};
static bool ReverseCompareNodeMinPingTime(const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
{
return a.nMinPingUsecTime > b.nMinPingUsecTime;
}
static bool ReverseCompareNodeTimeConnected(const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
{
return a.nTimeConnected > b.nTimeConnected;
}
static bool CompareNetGroupKeyed(const NodeEvictionCandidate &a, const NodeEvictionCandidate &b) {
return a.nKeyedNetGroup < b.nKeyedNetGroup;
}
static bool CompareNodeBlockTime(const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
{
// There is a fall-through here because it is common for a node to have many peers which have not yet relayed a block.
if (a.nLastBlockTime != b.nLastBlockTime) return a.nLastBlockTime < b.nLastBlockTime;
if (a.fNetworkNode != b.fNetworkNode) return b.fNetworkNode;
return a.nTimeConnected > b.nTimeConnected;
}
static bool CompareNodeTXTime(const NodeEvictionCandidate &a, const NodeEvictionCandidate &b)
{
// There is a fall-through here because it is common for a node to have more than a few peers that have not yet relayed txn.
if (a.nLastTXTime != b.nLastTXTime) return a.nLastTXTime < b.nLastTXTime;
if (a.fRelayTxes != b.fRelayTxes) return b.fRelayTxes;
if (a.fBloomFilter != b.fBloomFilter) return a.fBloomFilter;
return a.nTimeConnected > b.nTimeConnected;
}
/** Try to find a connection to evict when the node is full.
* Extreme care must be taken to avoid opening the node to attacker
* triggered network partitioning.
* The strategy used here is to protect a small number of peers
* for each of several distinct characteristics which are difficult
* to forge. In order to partition a node the attacker must be
* simultaneously better at all of them than honest peers.
*/
static bool AttemptToEvictConnection() {
std::vector<NodeEvictionCandidate> vEvictionCandidates;
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode *node, vNodes) {
if (node->fWhitelisted)
continue;
if (!node->fInbound)
continue;
if (node->fDisconnect)
continue;
NodeEvictionCandidate candidate = {node->id, node->nTimeConnected, node->nMinPingUsecTime,
node->nLastBlockTime, node->nLastTXTime, node->fNetworkNode,
node->fRelayTxes, node->pfilter != NULL, node->addr, node->nKeyedNetGroup};
vEvictionCandidates.push_back(candidate);
}
}
if (vEvictionCandidates.empty()) return false;
// Protect connections with certain characteristics
// Deterministically select 4 peers to protect by netgroup.
// An attacker cannot predict which netgroups will be protected
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), CompareNetGroupKeyed);
vEvictionCandidates.erase(vEvictionCandidates.end() - std::min(4, static_cast<int>(vEvictionCandidates.size())), vEvictionCandidates.end());
if (vEvictionCandidates.empty()) return false;
// Protect the 8 nodes with the lowest minimum ping time.
// An attacker cannot manipulate this metric without physically moving nodes closer to the target.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), ReverseCompareNodeMinPingTime);
vEvictionCandidates.erase(vEvictionCandidates.end() - std::min(8, static_cast<int>(vEvictionCandidates.size())), vEvictionCandidates.end());
if (vEvictionCandidates.empty()) return false;
// Protect 4 nodes that most recently sent us transactions.
// An attacker cannot manipulate this metric without performing useful work.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), CompareNodeTXTime);
vEvictionCandidates.erase(vEvictionCandidates.end() - std::min(4, static_cast<int>(vEvictionCandidates.size())), vEvictionCandidates.end());
if (vEvictionCandidates.empty()) return false;
// Protect 4 nodes that most recently sent us blocks.
// An attacker cannot manipulate this metric without performing useful work.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), CompareNodeBlockTime);
vEvictionCandidates.erase(vEvictionCandidates.end() - std::min(4, static_cast<int>(vEvictionCandidates.size())), vEvictionCandidates.end());
if (vEvictionCandidates.empty()) return false;
// Protect the half of the remaining nodes which have been connected the longest.
// This replicates the non-eviction implicit behavior, and precludes attacks that start later.
std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), ReverseCompareNodeTimeConnected);
vEvictionCandidates.erase(vEvictionCandidates.end() - static_cast<int>(vEvictionCandidates.size() / 2), vEvictionCandidates.end());
if (vEvictionCandidates.empty()) return false;
// Identify the network group with the most connections and youngest member.
// (vEvictionCandidates is already sorted by reverse connect time)
uint64_t naMostConnections;
unsigned int nMostConnections = 0;
int64_t nMostConnectionsTime = 0;
std::map<uint64_t, std::vector<NodeEvictionCandidate> > mapNetGroupNodes;
BOOST_FOREACH(const NodeEvictionCandidate &node, vEvictionCandidates) {
mapNetGroupNodes[node.nKeyedNetGroup].push_back(node);
int64_t grouptime = mapNetGroupNodes[node.nKeyedNetGroup][0].nTimeConnected;
size_t groupsize = mapNetGroupNodes[node.nKeyedNetGroup].size();
if (groupsize > nMostConnections || (groupsize == nMostConnections && grouptime > nMostConnectionsTime)) {
nMostConnections = groupsize;
nMostConnectionsTime = grouptime;
naMostConnections = node.nKeyedNetGroup;
}
}
// Reduce to the network group with the most connections
vEvictionCandidates = std::move(mapNetGroupNodes[naMostConnections]);
// Disconnect from the network group with the most connections
NodeId evicted = vEvictionCandidates.front().id;
LOCK(cs_vNodes);
for(std::vector<CNode*>::const_iterator it(vNodes.begin()); it != vNodes.end(); ++it) {
if ((*it)->GetId() == evicted) {
(*it)->fDisconnect = true;
return true;
}
}
return false;
}
static void AcceptConnection(const ListenSocket& hListenSocket) {
struct sockaddr_storage sockaddr;
socklen_t len = sizeof(sockaddr);
SOCKET hSocket = accept(hListenSocket.socket, (struct sockaddr*)&sockaddr, &len);
CAddress addr;
int nInbound = 0;
int nMaxInbound = nMaxConnections - (MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS);
assert(nMaxInbound > 0);
if (hSocket != INVALID_SOCKET)
if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr))
LogPrintf("Warning: Unknown socket family\n");
bool whitelisted = hListenSocket.whitelisted || CNode::IsWhitelistedRange(addr);
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode->fInbound)
nInbound++;
}
if (hSocket == INVALID_SOCKET)
{
int nErr = WSAGetLastError();
if (nErr != WSAEWOULDBLOCK)
LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));
return;
}
if (!IsSelectableSocket(hSocket))
{
LogPrintf("connection from %s dropped: non-selectable socket\n", addr.ToString());
CloseSocket(hSocket);
return;
}
// According to the internet TCP_NODELAY is not carried into accepted sockets
// on all platforms. Set it again here just to be sure.
int set = 1;
#ifdef WIN32
setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&set, sizeof(int));
#else
setsockopt(hSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&set, sizeof(int));
#endif
if (CNode::IsBanned(addr) && !whitelisted)
{
LogPrintf("connection from %s dropped (banned)\n", addr.ToString());
CloseSocket(hSocket);
return;
}
if (nInbound >= nMaxInbound)
{
if (!AttemptToEvictConnection()) {
// No connection to evict, disconnect the new connection
LogPrint("net", "failed to find an eviction candidate - connection dropped (full)\n");
CloseSocket(hSocket);
return;
}
}
CNode* pnode = new CNode(hSocket, addr, "", true);
pnode->AddRef();
pnode->fWhitelisted = whitelisted;
LogPrint("net", "connection from %s accepted\n", addr.ToString());
{
LOCK(cs_vNodes);
vNodes.push_back(pnode);
}
}
void ThreadSocketHandler()
{
unsigned int nPrevNodeCount = 0;
while (true)
{
//
// Disconnect nodes
//
{
LOCK(cs_vNodes);
// Disconnect unused nodes
std::vector<CNode*> vNodesCopy = vNodes;
BOOST_FOREACH(CNode* pnode, vNodesCopy)
{
if (pnode->fDisconnect ||
(pnode->GetRefCount() <= 0 && pnode->vRecvMsg.empty() && pnode->nSendSize == 0 && pnode->ssSend.empty()))
{
// remove from vNodes
vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
// release outbound grant (if any)
pnode->grantOutbound.Release();
// close socket and cleanup
pnode->CloseSocketDisconnect();
// hold in disconnected pool until all refs are released
if (pnode->fNetworkNode || pnode->fInbound)
pnode->Release();
vNodesDisconnected.push_back(pnode);
}
}
}
{
// Delete disconnected nodes
std::list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
BOOST_FOREACH(CNode* pnode, vNodesDisconnectedCopy)
{
// wait until threads are done using it
if (pnode->GetRefCount() <= 0)
{
bool fDelete = false;
{
TRY_LOCK(pnode->cs_vSend, lockSend);
if (lockSend)
{
TRY_LOCK(pnode->cs_vRecvMsg, lockRecv);
if (lockRecv)
{
TRY_LOCK(pnode->cs_inventory, lockInv);
if (lockInv)
fDelete = true;
}
}
}
if (fDelete)
{
vNodesDisconnected.remove(pnode);
delete pnode;
}
}
}
}
if(vNodes.size() != nPrevNodeCount) {
nPrevNodeCount = vNodes.size();
uiInterface.NotifyNumConnectionsChanged(nPrevNodeCount);
}
//
// 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;
bool have_fds = false;
BOOST_FOREACH(const ListenSocket& hListenSocket, vhListenSocket) {
FD_SET(hListenSocket.socket, &fdsetRecv);
hSocketMax = std::max(hSocketMax, hListenSocket.socket);
have_fds = true;
}
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
{
if (pnode->hSocket == INVALID_SOCKET)
continue;
FD_SET(pnode->hSocket, &fdsetError);
hSocketMax = std::max(hSocketMax, pnode->hSocket);
have_fds = true;
// Implement the following logic:
// * If there is data to send, select() for sending data. As this only
// happens when optimistic write failed, we choose to first drain the
// write buffer in this case before receiving more. This avoids
// needlessly queueing received data, if the remote peer is not themselves
// receiving data. This means properly utilizing TCP flow control signalling.
// * Otherwise, if there is no (complete) message in the receive buffer,
// or there is space left in the buffer, select() for receiving data.
// * (if neither of the above applies, there is certainly one message
// in the receiver buffer ready to be processed).
// Together, that means that at least one of the following is always possible,
// so we don't deadlock:
// * We send some data.
// * We wait for data to be received (and disconnect after timeout).
// * We process a message in the buffer (message handler thread).
{
TRY_LOCK(pnode->cs_vSend, lockSend);
if (lockSend && !pnode->vSendMsg.empty()) {
FD_SET(pnode->hSocket, &fdsetSend);
continue;
}
}
{
TRY_LOCK(pnode->cs_vRecvMsg, lockRecv);
if (lockRecv && (
pnode->vRecvMsg.empty() || !pnode->vRecvMsg.front().complete() ||
pnode->GetTotalRecvSize() <= ReceiveFloodSize()))
FD_SET(pnode->hSocket, &fdsetRecv);
}
}
}
int nSelect = select(have_fds ? hSocketMax + 1 : 0,
&fdsetRecv, &fdsetSend, &fdsetError, &timeout);
boost::this_thread::interruption_point();
if (nSelect == SOCKET_ERROR)
{
if (have_fds)
{
int nErr = WSAGetLastError();
LogPrintf("socket select error %s\n", NetworkErrorString(nErr));
for (unsigned int i = 0; i <= hSocketMax; i++)
FD_SET(i, &fdsetRecv);
}
FD_ZERO(&fdsetSend);
FD_ZERO(&fdsetError);
MilliSleep(timeout.tv_usec/1000);
}
//
// Accept new connections
//
BOOST_FOREACH(const ListenSocket& hListenSocket, vhListenSocket)
{
if (hListenSocket.socket != INVALID_SOCKET && FD_ISSET(hListenSocket.socket, &fdsetRecv))
{
AcceptConnection(hListenSocket);
}
}
//
// Service each socket
//
std::vector<CNode*> vNodesCopy;
{
LOCK(cs_vNodes);
vNodesCopy = vNodes;
BOOST_FOREACH(CNode* pnode, vNodesCopy)
pnode->AddRef();
}
BOOST_FOREACH(CNode* pnode, vNodesCopy)
{
boost::this_thread::interruption_point();
//
// Receive
//
if (pnode->hSocket == INVALID_SOCKET)
continue;
if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
{
TRY_LOCK(pnode->cs_vRecvMsg, lockRecv);
if (lockRecv)
{
{
// typical socket buffer is 8K-64K
char pchBuf[0x10000];
int nBytes = recv(pnode->hSocket, pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
if (nBytes > 0)
{
if (!pnode->ReceiveMsgBytes(pchBuf, nBytes))
pnode->CloseSocketDisconnect();
pnode->nLastRecv = GetTime();
pnode->nRecvBytes += nBytes;
pnode->RecordBytesRecv(nBytes);
}
else if (nBytes == 0)
{
// socket closed gracefully
if (!pnode->fDisconnect)
LogPrint("net", "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)
LogPrintf("socket recv error %s\n", NetworkErrorString(nErr));
pnode->CloseSocketDisconnect();
}
}
}
}
}
//
// Send
//
if (pnode->hSocket == INVALID_SOCKET)
continue;
if (FD_ISSET(pnode->hSocket, &fdsetSend))
{
TRY_LOCK(pnode->cs_vSend, lockSend);
if (lockSend)
SocketSendData(pnode);
}
//
// Inactivity checking
//
int64_t nTime = GetTime();
if (nTime - pnode->nTimeConnected > 60)
{
if (pnode->nLastRecv == 0 || pnode->nLastSend == 0)
{
LogPrint("net", "socket no message in first 60 seconds, %d %d from %d\n", pnode->nLastRecv != 0, pnode->nLastSend != 0, pnode->id);
pnode->fDisconnect = true;
}
else if (nTime - pnode->nLastSend > TIMEOUT_INTERVAL)
{
LogPrintf("socket sending timeout: %is\n", nTime - pnode->nLastSend);
pnode->fDisconnect = true;
}
else if (nTime - pnode->nLastRecv > (pnode->nVersion > BIP0031_VERSION ? TIMEOUT_INTERVAL : 90*60))
{
LogPrintf("socket receive timeout: %is\n", nTime - pnode->nLastRecv);
pnode->fDisconnect = true;
}
else if (pnode->nPingNonceSent && pnode->nPingUsecStart + TIMEOUT_INTERVAL * 1000000 < GetTimeMicros())
{
LogPrintf("ping timeout: %fs\n", 0.000001 * (GetTimeMicros() - pnode->nPingUsecStart));
pnode->fDisconnect = true;
}
}
}
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodesCopy)
pnode->Release();
}
}
}
#ifdef USE_UPNP
void ThreadMapPort()
{
std::string port = strprintf("%u", GetListenPort());
const char * multicastif = 0;
const char * minissdpdpath = 0;
struct UPNPDev * devlist = 0;
char lanaddr[64];
#ifndef UPNPDISCOVER_SUCCESS
/* miniupnpc 1.5 */
devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0);
#elif MINIUPNPC_API_VERSION < 14
/* miniupnpc 1.6 */
int error = 0;
devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, &error);
#else
/* miniupnpc 1.9.20150730 */
int error = 0;
devlist = upnpDiscover(2000, multicastif, minissdpdpath, 0, 0, 2, &error);
#endif
struct UPNPUrls urls;
struct IGDdatas data;
int r;
r = UPNP_GetValidIGD(devlist, &urls, &data, lanaddr, sizeof(lanaddr));
if (r == 1)
{
if (fDiscover) {
char externalIPAddress[40];
r = UPNP_GetExternalIPAddress(urls.controlURL, data.first.servicetype, externalIPAddress);
if(r != UPNPCOMMAND_SUCCESS)
LogPrintf("UPnP: GetExternalIPAddress() returned %d\n", r);
else
{
if(externalIPAddress[0])
{
CNetAddr resolved;
if(LookupHost(externalIPAddress, resolved, false)) {
LogPrintf("UPnP: ExternalIPAddress = %s\n", resolved.ToString().c_str());
AddLocal(resolved, LOCAL_UPNP);
}
}
else
LogPrintf("UPnP: GetExternalIPAddress failed.\n");
}
}
std::string strDesc = "Bitcoin " + FormatFullVersion();
try {
while (true) {
#ifndef UPNPDISCOVER_SUCCESS
/* miniupnpc 1.5 */
r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0);
#else
/* miniupnpc 1.6 */
r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0, "0");
#endif
if(r!=UPNPCOMMAND_SUCCESS)
LogPrintf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
port, port, lanaddr, r, strupnperror(r));
else
LogPrintf("UPnP Port Mapping successful.\n");
MilliSleep(20*60*1000); // Refresh every 20 minutes
}
}
catch (const boost::thread_interrupted&)
{
r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port.c_str(), "TCP", 0);
LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
freeUPNPDevlist(devlist); devlist = 0;
FreeUPNPUrls(&urls);
throw;
}
} else {
LogPrintf("No valid UPnP IGDs found\n");
freeUPNPDevlist(devlist); devlist = 0;
if (r != 0)
FreeUPNPUrls(&urls);
}
}
void MapPort(bool fUseUPnP)
{
static boost::thread* upnp_thread = NULL;
if (fUseUPnP)
{
if (upnp_thread) {
upnp_thread->interrupt();
upnp_thread->join();
delete upnp_thread;
}
upnp_thread = new boost::thread(boost::bind(&TraceThread<void (*)()>, "upnp", &ThreadMapPort));
}
else if (upnp_thread) {
upnp_thread->interrupt();
upnp_thread->join();
delete upnp_thread;
upnp_thread = NULL;
}
}
#else
void MapPort(bool)
{
// Intentionally left blank.
}
#endif
static std::string GetDNSHost(const CDNSSeedData& data, ServiceFlags* requiredServiceBits)
{
//use default host for non-filter-capable seeds or if we use the default service bits (NODE_NETWORK)
if (!data.supportsServiceBitsFiltering || *requiredServiceBits == NODE_NETWORK) {
*requiredServiceBits = NODE_NETWORK;
return data.host;
}
return strprintf("x%x.%s", *requiredServiceBits, data.host);
}
void ThreadDNSAddressSeed()
{
// goal: only query DNS seeds if address need is acute
if ((addrman.size() > 0) &&
(!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
MilliSleep(11 * 1000);
LOCK(cs_vNodes);
if (vNodes.size() >= 2) {
LogPrintf("P2P peers available. Skipped DNS seeding.\n");
return;
}
}
const std::vector<CDNSSeedData> &vSeeds = Params().DNSSeeds();
int found = 0;
LogPrintf("Loading addresses from DNS seeds (could take a while)\n");
BOOST_FOREACH(const CDNSSeedData &seed, vSeeds) {
if (HaveNameProxy()) {
AddOneShot(seed.host);
} else {
std::vector<CNetAddr> vIPs;
std::vector<CAddress> vAdd;
ServiceFlags requiredServiceBits = nRelevantServices;
if (LookupHost(GetDNSHost(seed, &requiredServiceBits).c_str(), vIPs, 0, true))
{
BOOST_FOREACH(const CNetAddr& ip, vIPs)
{
int nOneDay = 24*3600;
CAddress addr = CAddress(CService(ip, Params().GetDefaultPort()), requiredServiceBits);
addr.nTime = GetTime() - 3*nOneDay - GetRand(4*nOneDay); // use a random age between 3 and 7 days old
vAdd.push_back(addr);
found++;
}
}
// TODO: The seed name resolve may fail, yielding an IP of [::], which results in
// addrman assigning the same source to results from different seeds.
// This should switch to a hard-coded stable dummy IP for each seed name, so that the
// resolve is not required at all.
if (!vIPs.empty()) {
CService seedSource;
Lookup(seed.name.c_str(), seedSource, 0, true);
addrman.Add(vAdd, seedSource);
}
}
}
LogPrintf("%d addresses found from DNS seeds\n", found);
}
void DumpAddresses()
{
int64_t nStart = GetTimeMillis();
CAddrDB adb;
adb.Write(addrman);
LogPrint("net", "Flushed %d addresses to peers.dat %dms\n",
addrman.size(), GetTimeMillis() - nStart);
}
void DumpData()
{
DumpAddresses();
DumpBanlist();
}
void static ProcessOneShot()
{
std::string strDest;
{
LOCK(cs_vOneShots);
if (vOneShots.empty())
return;
strDest = vOneShots.front();
vOneShots.pop_front();
}
CAddress addr;
CSemaphoreGrant grant(*semOutbound, true);
if (grant) {
if (!OpenNetworkConnection(addr, false, &grant, strDest.c_str(), true))
AddOneShot(strDest);
}
}
void ThreadOpenConnections()
{
// Connect to specific addresses
if (mapArgs.count("-connect") && mapMultiArgs["-connect"].size() > 0)
{
for (int64_t nLoop = 0;; nLoop++)
{
ProcessOneShot();
BOOST_FOREACH(const std::string& strAddr, mapMultiArgs["-connect"])
{
CAddress addr(CService(), NODE_NONE);
OpenNetworkConnection(addr, false, NULL, strAddr.c_str());
for (int i = 0; i < 10 && i < nLoop; i++)
{
MilliSleep(500);
}
}
MilliSleep(500);
}
}
// Initiate network connections
int64_t nStart = GetTime();
// Minimum time before next feeler connection (in microseconds).
int64_t nNextFeeler = PoissonNextSend(nStart*1000*1000, FEELER_INTERVAL);
while (true)
{
ProcessOneShot();
MilliSleep(500);
CSemaphoreGrant grant(*semOutbound);
boost::this_thread::interruption_point();
// Add seed nodes if DNS seeds are all down (an infrastructure attack?).
if (addrman.size() == 0 && (GetTime() - nStart > 60)) {
static bool done = false;
if (!done) {
LogPrintf("Adding fixed seed nodes as DNS doesn't seem to be available.\n");
CNetAddr local;
LookupHost("127.0.0.1", local, false);
addrman.Add(convertSeed6(Params().FixedSeeds()), local);
done = true;
}
}
//
// Choose an address to connect to based on most recently seen
//
CAddress addrConnect;
// Only connect out to one peer per network group (/16 for IPv4).
// Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
int nOutbound = 0;
std::set<std::vector<unsigned char> > setConnected;
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes) {
if (!pnode->fInbound) {
setConnected.insert(pnode->addr.GetGroup());
nOutbound++;
}
}
}
assert(nOutbound <= (MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS));
// Feeler Connections
//
// Design goals:
// * Increase the number of connectable addresses in the tried table.
//
// Method:
// * Choose a random address from new and attempt to connect to it if we can connect
// successfully it is added to tried.
// * Start attempting feeler connections only after node finishes making outbound
// connections.
// * Only make a feeler connection once every few minutes.
//
bool fFeeler = false;
if (nOutbound >= MAX_OUTBOUND_CONNECTIONS) {
int64_t nTime = GetTimeMicros(); // The current time right now (in microseconds).
if (nTime > nNextFeeler) {
nNextFeeler = PoissonNextSend(nTime, FEELER_INTERVAL);
fFeeler = true;
} else {
continue;
}
}
int64_t nANow = GetAdjustedTime();
int nTries = 0;
while (true)
{
CAddrInfo addr = addrman.Select(fFeeler);
// if we selected an invalid address, restart
if (!addr.IsValid() || setConnected.count(addr.GetGroup()) || IsLocal(addr))
break;
// If we didn't find an appropriate destination after trying 100 addresses fetched from addrman,
// stop this loop, and let the outer loop run again (which sleeps, adds seed nodes, recalculates
// already-connected network ranges, ...) before trying new addrman addresses.
nTries++;
if (nTries > 100)
break;
if (IsLimited(addr))
continue;
// only connect to full nodes
if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES)
continue;
// only consider very recently tried nodes after 30 failed attempts
if (nANow - addr.nLastTry < 600 && nTries < 30)
continue;
// only consider nodes missing relevant services after 40 failed attempts
if ((addr.nServices & nRelevantServices) != nRelevantServices && nTries < 40)
continue;
// do not allow non-default ports, unless after 50 invalid addresses selected already
if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50)
continue;
addrConnect = addr;
break;
}
if (addrConnect.IsValid()) {
if (fFeeler) {
// Add small amount of random noise before connection to avoid synchronization.
int randsleep = GetRandInt(FEELER_SLEEP_WINDOW * 1000);
MilliSleep(randsleep);
LogPrint("net", "Making feeler connection to %s\n", addrConnect.ToString());
}
OpenNetworkConnection(addrConnect, (int)setConnected.size() >= std::min(nMaxConnections - 1, 2), &grant, NULL, false, fFeeler);
}
}
}
std::vector<AddedNodeInfo> GetAddedNodeInfo()
{
std::vector<AddedNodeInfo> ret;
std::list<std::string> lAddresses(0);
{
LOCK(cs_vAddedNodes);
ret.reserve(vAddedNodes.size());
BOOST_FOREACH(const std::string& strAddNode, vAddedNodes)
lAddresses.push_back(strAddNode);
}
// Build a map of all already connected addresses (by IP:port and by name) to inbound/outbound and resolved CService
std::map<CService, bool> mapConnected;
std::map<std::string, std::pair<bool, CService>> mapConnectedByName;
{
LOCK(cs_vNodes);
for (const CNode* pnode : vNodes) {
if (pnode->addr.IsValid()) {
mapConnected[pnode->addr] = pnode->fInbound;
}
if (!pnode->addrName.empty()) {
mapConnectedByName[pnode->addrName] = std::make_pair(pnode->fInbound, static_cast<const CService&>(pnode->addr));
}
}
}
BOOST_FOREACH(const std::string& strAddNode, lAddresses) {
CService service(LookupNumeric(strAddNode.c_str(), Params().GetDefaultPort()));
if (service.IsValid()) {
// strAddNode is an IP:port
auto it = mapConnected.find(service);
if (it != mapConnected.end()) {
ret.push_back(AddedNodeInfo{strAddNode, service, true, it->second});
} else {
ret.push_back(AddedNodeInfo{strAddNode, CService(), false, false});
}
} else {
// strAddNode is a name
auto it = mapConnectedByName.find(strAddNode);
if (it != mapConnectedByName.end()) {
ret.push_back(AddedNodeInfo{strAddNode, it->second.second, true, it->second.first});
} else {
ret.push_back(AddedNodeInfo{strAddNode, CService(), false, false});
}
}
}
return ret;
}
void ThreadOpenAddedConnections()
{
{
LOCK(cs_vAddedNodes);
vAddedNodes = mapMultiArgs["-addnode"];
}
for (unsigned int i = 0; true; i++)
{
std::vector<AddedNodeInfo> vInfo = GetAddedNodeInfo();
for (const AddedNodeInfo& info : vInfo) {
if (!info.fConnected) {
CSemaphoreGrant grant(*semOutbound);
// If strAddedNode is an IP/port, decode it immediately, so
// OpenNetworkConnection can detect existing connections to that IP/port.
CService service(LookupNumeric(info.strAddedNode.c_str(), Params().GetDefaultPort()));
OpenNetworkConnection(CAddress(service, NODE_NONE), false, &grant, info.strAddedNode.c_str(), false);
MilliSleep(500);
}
}
MilliSleep(120000); // Retry every 2 minutes
}
}
// if successful, this moves the passed grant to the constructed node
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler)
{
//
// Initiate outbound network connection
//
boost::this_thread::interruption_point();
if (!pszDest) {
if (IsLocal(addrConnect) ||
FindNode((CNetAddr)addrConnect) || CNode::IsBanned(addrConnect) ||
FindNode(addrConnect.ToStringIPPort()))
return false;
} else if (FindNode(std::string(pszDest)))
return false;
CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure);
boost::this_thread::interruption_point();
if (!pnode)
return false;
if (grantOutbound)
grantOutbound->MoveTo(pnode->grantOutbound);
pnode->fNetworkNode = true;
if (fOneShot)
pnode->fOneShot = true;
if (fFeeler)
pnode->fFeeler = true;
return true;
}
void ThreadMessageHandler()
{
boost::mutex condition_mutex;
boost::unique_lock<boost::mutex> lock(condition_mutex);
while (true)
{
std::vector<CNode*> vNodesCopy;
{
LOCK(cs_vNodes);
vNodesCopy = vNodes;
BOOST_FOREACH(CNode* pnode, vNodesCopy) {
pnode->AddRef();
}
}
bool fSleep = true;
BOOST_FOREACH(CNode* pnode, vNodesCopy)
{
if (pnode->fDisconnect)
continue;
// Receive messages
{
TRY_LOCK(pnode->cs_vRecvMsg, lockRecv);
if (lockRecv)
{
if (!GetNodeSignals().ProcessMessages(pnode))
pnode->CloseSocketDisconnect();
if (pnode->nSendSize < SendBufferSize())
{
if (!pnode->vRecvGetData.empty() || (!pnode->vRecvMsg.empty() && pnode->vRecvMsg[0].complete()))
{
fSleep = false;
}
}
}
}
boost::this_thread::interruption_point();
// Send messages
{
TRY_LOCK(pnode->cs_vSend, lockSend);
if (lockSend)
GetNodeSignals().SendMessages(pnode);
}
boost::this_thread::interruption_point();
}
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodesCopy)
pnode->Release();
}
if (fSleep)
messageHandlerCondition.timed_wait(lock, boost::posix_time::microsec_clock::universal_time() + boost::posix_time::milliseconds(100));
}
}
bool BindListenPort(const CService &addrBind, std::string& strError, bool fWhitelisted)
{
strError = "";
int nOne = 1;
// Create socket for listening for incoming connections
struct sockaddr_storage sockaddr;
socklen_t len = sizeof(sockaddr);
if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
{
strError = strprintf("Error: Bind address family for %s not supported", addrBind.ToString());
LogPrintf("%s\n", strError);
return false;
}
SOCKET hListenSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
if (hListenSocket == INVALID_SOCKET)
{
strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %s)", NetworkErrorString(WSAGetLastError()));
LogPrintf("%s\n", strError);
return false;
}
if (!IsSelectableSocket(hListenSocket))
{
strError = "Error: Couldn't create a listenable socket for incoming connections";
LogPrintf("%s\n", strError);
return false;
}
#ifndef WIN32
#ifdef SO_NOSIGPIPE
// Different way of disabling SIGPIPE on BSD
setsockopt(hListenSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nOne, sizeof(int));
#endif
// Allow binding if the port is still in TIME_WAIT state after
// the program was closed and restarted.
setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
// Disable Nagle's algorithm
setsockopt(hListenSocket, IPPROTO_TCP, TCP_NODELAY, (void*)&nOne, sizeof(int));
#else
setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (const char*)&nOne, sizeof(int));
setsockopt(hListenSocket, IPPROTO_TCP, TCP_NODELAY, (const char*)&nOne, sizeof(int));
#endif
// Set to non-blocking, incoming connections will also inherit this
if (!SetSocketNonBlocking(hListenSocket, true)) {
strError = strprintf("BindListenPort: Setting listening socket to non-blocking failed, error %s\n", NetworkErrorString(WSAGetLastError()));
LogPrintf("%s\n", strError);
return false;
}
// some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
// and enable it by default or not. Try to enable it, if possible.
if (addrBind.IsIPv6()) {
#ifdef IPV6_V6ONLY
#ifdef WIN32
setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&nOne, sizeof(int));
#else
setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&nOne, sizeof(int));
#endif
#endif
#ifdef WIN32
int nProtLevel = PROTECTION_LEVEL_UNRESTRICTED;
setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL, (const char*)&nProtLevel, sizeof(int));
#endif
}
if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
{
int nErr = WSAGetLastError();
if (nErr == WSAEADDRINUSE)
strError = strprintf(_("Unable to bind to %s on this computer. %s is probably already running."), addrBind.ToString(), _(PACKAGE_NAME));
else
strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToString(), NetworkErrorString(nErr));
LogPrintf("%s\n", strError);
CloseSocket(hListenSocket);
return false;
}
LogPrintf("Bound to %s\n", addrBind.ToString());
// Listen for incoming connections
if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
{
strError = strprintf(_("Error: Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));
LogPrintf("%s\n", strError);
CloseSocket(hListenSocket);
return false;
}
vhListenSocket.push_back(ListenSocket(hListenSocket, fWhitelisted));
if (addrBind.IsRoutable() && fDiscover && !fWhitelisted)
AddLocal(addrBind, LOCAL_BIND);
return true;
}
void static Discover(boost::thread_group& threadGroup)
{
if (!fDiscover)
return;
#ifdef WIN32
// Get local host IP
char pszHostName[256] = "";
if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
{
std::vector<CNetAddr> vaddr;
if (LookupHost(pszHostName, vaddr, 0, true))
{
BOOST_FOREACH (const CNetAddr &addr, vaddr)
{
if (AddLocal(addr, LOCAL_IF))
LogPrintf("%s: %s - %s\n", __func__, pszHostName, addr.ToString());
}
}
}
#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;
if (ifa->ifa_addr->sa_family == AF_INET)
{
struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
CNetAddr addr(s4->sin_addr);
if (AddLocal(addr, LOCAL_IF))
LogPrintf("%s: IPv4 %s: %s\n", __func__, ifa->ifa_name, addr.ToString());
}
else if (ifa->ifa_addr->sa_family == AF_INET6)
{
struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
CNetAddr addr(s6->sin6_addr);
if (AddLocal(addr, LOCAL_IF))
LogPrintf("%s: IPv6 %s: %s\n", __func__, ifa->ifa_name, addr.ToString());
}
}
freeifaddrs(myaddrs);
}
#endif
}
void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler)
{
uiInterface.InitMessage(_("Loading addresses..."));
// Load addresses from peers.dat
int64_t nStart = GetTimeMillis();
{
CAddrDB adb;
if (adb.Read(addrman))
LogPrintf("Loaded %i addresses from peers.dat %dms\n", addrman.size(), GetTimeMillis() - nStart);
else {
addrman.Clear(); // Addrman can be in an inconsistent state after failure, reset it
LogPrintf("Invalid or missing peers.dat; recreating\n");
DumpAddresses();
}
}
uiInterface.InitMessage(_("Loading banlist..."));
// Load addresses from banlist.dat
nStart = GetTimeMillis();
CBanDB bandb;
banmap_t banmap;
if (bandb.Read(banmap)) {
CNode::SetBanned(banmap); // thread save setter
CNode::SetBannedSetDirty(false); // no need to write down, just read data
CNode::SweepBanned(); // sweep out unused entries
LogPrint("net", "Loaded %d banned node ips/subnets from banlist.dat %dms\n",
banmap.size(), GetTimeMillis() - nStart);
} else {
LogPrintf("Invalid or missing banlist.dat; recreating\n");
CNode::SetBannedSetDirty(true); // force write
DumpBanlist();
}
uiInterface.InitMessage(_("Starting network threads..."));
fAddressesInitialized = true;
if (semOutbound == NULL) {
// initialize semaphore
int nMaxOutbound = std::min((MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS), nMaxConnections);
semOutbound = new CSemaphore(nMaxOutbound);
}
if (pnodeLocalHost == NULL) {
CNetAddr local;
LookupHost("127.0.0.1", local, false);
pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress(CService(local, 0), nLocalServices));
}
Discover(threadGroup);
//
// Start threads
//
if (!GetBoolArg("-dnsseed", true))
LogPrintf("DNS seeding disabled\n");
else
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "dnsseed", &ThreadDNSAddressSeed));
// Map ports with UPnP
MapPort(GetBoolArg("-upnp", DEFAULT_UPNP));
// Send and receive from sockets, accept connections
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "net", &ThreadSocketHandler));
// Initiate outbound connections from -addnode
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "addcon", &ThreadOpenAddedConnections));
// Initiate outbound connections
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "opencon", &ThreadOpenConnections));
// Process messages
threadGroup.create_thread(boost::bind(&TraceThread<void (*)()>, "msghand", &ThreadMessageHandler));
// Dump network addresses
scheduler.scheduleEvery(&DumpData, DUMP_ADDRESSES_INTERVAL);
}
bool StopNode()
{
LogPrintf("StopNode()\n");
MapPort(false);
if (semOutbound)
for (int i=0; i<(MAX_OUTBOUND_CONNECTIONS + MAX_FEELER_CONNECTIONS); i++)
semOutbound->post();
if (fAddressesInitialized)
{
DumpData();
fAddressesInitialized = false;
}
return true;
}
class CNetCleanup
{
public:
CNetCleanup() {}
~CNetCleanup()
{
// Close sockets
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode->hSocket != INVALID_SOCKET)
CloseSocket(pnode->hSocket);
BOOST_FOREACH(ListenSocket& hListenSocket, vhListenSocket)
if (hListenSocket.socket != INVALID_SOCKET)
if (!CloseSocket(hListenSocket.socket))
LogPrintf("CloseSocket(hListenSocket) failed with error %s\n", NetworkErrorString(WSAGetLastError()));
// clean up some globals (to help leak detection)
BOOST_FOREACH(CNode *pnode, vNodes)
delete pnode;
BOOST_FOREACH(CNode *pnode, vNodesDisconnected)
delete pnode;
vNodes.clear();
vNodesDisconnected.clear();
vhListenSocket.clear();
delete semOutbound;
semOutbound = NULL;
delete pnodeLocalHost;
pnodeLocalHost = NULL;
#ifdef WIN32
// Shutdown Windows Sockets
WSACleanup();
#endif
}
}
instance_of_cnetcleanup;
void RelayTransaction(const CTransaction& tx)
{
CInv inv(MSG_TX, tx.GetHash());
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
{
pnode->PushInventory(inv);
}
}
void CNode::RecordBytesRecv(uint64_t bytes)
{
LOCK(cs_totalBytesRecv);
nTotalBytesRecv += bytes;
}
void CNode::RecordBytesSent(uint64_t bytes)
{
LOCK(cs_totalBytesSent);
nTotalBytesSent += bytes;
uint64_t now = GetTime();
if (nMaxOutboundCycleStartTime + nMaxOutboundTimeframe < now)
{
// timeframe expired, reset cycle
nMaxOutboundCycleStartTime = now;
nMaxOutboundTotalBytesSentInCycle = 0;
}
// TODO, exclude whitebind peers
nMaxOutboundTotalBytesSentInCycle += bytes;
}
void CNode::SetMaxOutboundTarget(uint64_t limit)
{
LOCK(cs_totalBytesSent);
uint64_t recommendedMinimum = (nMaxOutboundTimeframe / 600) * MAX_BLOCK_SERIALIZED_SIZE;
nMaxOutboundLimit = limit;
if (limit > 0 && limit < recommendedMinimum)
LogPrintf("Max outbound target is very small (%s bytes) and will be overshot. Recommended minimum is %s bytes.\n", nMaxOutboundLimit, recommendedMinimum);
}
uint64_t CNode::GetMaxOutboundTarget()
{
LOCK(cs_totalBytesSent);
return nMaxOutboundLimit;
}
uint64_t CNode::GetMaxOutboundTimeframe()
{
LOCK(cs_totalBytesSent);
return nMaxOutboundTimeframe;
}
uint64_t CNode::GetMaxOutboundTimeLeftInCycle()
{
LOCK(cs_totalBytesSent);
if (nMaxOutboundLimit == 0)
return 0;
if (nMaxOutboundCycleStartTime == 0)
return nMaxOutboundTimeframe;
uint64_t cycleEndTime = nMaxOutboundCycleStartTime + nMaxOutboundTimeframe;
uint64_t now = GetTime();
return (cycleEndTime < now) ? 0 : cycleEndTime - GetTime();
}
void CNode::SetMaxOutboundTimeframe(uint64_t timeframe)
{
LOCK(cs_totalBytesSent);
if (nMaxOutboundTimeframe != timeframe)
{
// reset measure-cycle in case of changing
// the timeframe
nMaxOutboundCycleStartTime = GetTime();
}
nMaxOutboundTimeframe = timeframe;
}
bool CNode::OutboundTargetReached(bool historicalBlockServingLimit)
{
LOCK(cs_totalBytesSent);
if (nMaxOutboundLimit == 0)
return false;
if (historicalBlockServingLimit)
{
// keep a large enough buffer to at least relay each block once
uint64_t timeLeftInCycle = GetMaxOutboundTimeLeftInCycle();
uint64_t buffer = timeLeftInCycle / 600 * MAX_BLOCK_SERIALIZED_SIZE;
if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
return true;
}
else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
return true;
return false;
}
uint64_t CNode::GetOutboundTargetBytesLeft()
{
LOCK(cs_totalBytesSent);
if (nMaxOutboundLimit == 0)
return 0;
return (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit) ? 0 : nMaxOutboundLimit - nMaxOutboundTotalBytesSentInCycle;
}
uint64_t CNode::GetTotalBytesRecv()
{
LOCK(cs_totalBytesRecv);
return nTotalBytesRecv;
}
uint64_t CNode::GetTotalBytesSent()
{
LOCK(cs_totalBytesSent);
return nTotalBytesSent;
}
void CNode::Fuzz(int nChance)
{
if (!fSuccessfullyConnected) return; // Don't fuzz initial handshake
if (GetRand(nChance) != 0) return; // Fuzz 1 of every nChance messages
switch (GetRand(3))
{
case 0:
// xor a random byte with a random value:
if (!ssSend.empty()) {
CDataStream::size_type pos = GetRand(ssSend.size());
ssSend[pos] ^= (unsigned char)(GetRand(256));
}
break;
case 1:
// delete a random byte:
if (!ssSend.empty()) {
CDataStream::size_type pos = GetRand(ssSend.size());
ssSend.erase(ssSend.begin()+pos);
}
break;
case 2:
// insert a random byte at a random position
{
CDataStream::size_type pos = GetRand(ssSend.size());
char ch = (char)GetRand(256);
ssSend.insert(ssSend.begin()+pos, ch);
}
break;
}
// Chance of more than one change half the time:
// (more changes exponentially less likely):
Fuzz(2);
}
//
// CAddrDB
//
CAddrDB::CAddrDB()
{
pathAddr = GetDataDir() / "peers.dat";
}
bool CAddrDB::Write(const CAddrMan& addr)
{
// Generate random temporary filename
unsigned short randv = 0;
GetRandBytes((unsigned char*)&randv, sizeof(randv));
std::string tmpfn = strprintf("peers.dat.%04x", randv);
// serialize addresses, checksum data up to that point, then append csum
CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
ssPeers << FLATDATA(Params().MessageStart());
ssPeers << addr;
uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
ssPeers << hash;
// open temp output file, and associate with CAutoFile
boost::filesystem::path pathTmp = GetDataDir() / tmpfn;
FILE *file = fopen(pathTmp.string().c_str(), "wb");
CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
if (fileout.IsNull())
return error("%s: Failed to open file %s", __func__, pathTmp.string());
// Write and commit header, data
try {
fileout << ssPeers;
}
catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
FileCommit(fileout.Get());
fileout.fclose();
// replace existing peers.dat, if any, with new peers.dat.XXXX
if (!RenameOver(pathTmp, pathAddr))
return error("%s: Rename-into-place failed", __func__);
return true;
}
bool CAddrDB::Read(CAddrMan& addr)
{
// open input file, and associate with CAutoFile
FILE *file = fopen(pathAddr.string().c_str(), "rb");
CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
if (filein.IsNull())
return error("%s: Failed to open file %s", __func__, pathAddr.string());
// use file size to size memory buffer
uint64_t fileSize = boost::filesystem::file_size(pathAddr);
uint64_t dataSize = 0;
// Don't try to resize to a negative number if file is small
if (fileSize >= sizeof(uint256))
dataSize = fileSize - sizeof(uint256);
std::vector<unsigned char> vchData;
vchData.resize(dataSize);
uint256 hashIn;
// read data and checksum from file
try {
filein.read((char *)&vchData[0], dataSize);
filein >> hashIn;
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
filein.fclose();
CDataStream ssPeers(vchData, SER_DISK, CLIENT_VERSION);
// verify stored checksum matches input data
uint256 hashTmp = Hash(ssPeers.begin(), ssPeers.end());
if (hashIn != hashTmp)
return error("%s: Checksum mismatch, data corrupted", __func__);
return Read(addr, ssPeers);
}
bool CAddrDB::Read(CAddrMan& addr, CDataStream& ssPeers)
{
unsigned char pchMsgTmp[4];
try {
// de-serialize file header (network specific magic number) and ..
ssPeers >> FLATDATA(pchMsgTmp);
// ... verify the network matches ours
if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
return error("%s: Invalid network magic number", __func__);
// de-serialize address data into one CAddrMan object
ssPeers >> addr;
}
catch (const std::exception& e) {
// de-serialization has failed, ensure addrman is left in a clean state
addr.Clear();
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
return true;
}
unsigned int ReceiveFloodSize() { return 1000*GetArg("-maxreceivebuffer", DEFAULT_MAXRECEIVEBUFFER); }
unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER); }
CNode::CNode(SOCKET hSocketIn, const CAddress& addrIn, const std::string& addrNameIn, bool fInboundIn) :
ssSend(SER_NETWORK, INIT_PROTO_VERSION),
addr(addrIn),
nKeyedNetGroup(CalculateKeyedNetGroup(addrIn)),
addrKnown(5000, 0.001),
filterInventoryKnown(50000, 0.000001)
{
nServices = NODE_NONE;
nServicesExpected = NODE_NONE;
hSocket = hSocketIn;
nRecvVersion = INIT_PROTO_VERSION;
nLastSend = 0;
nLastRecv = 0;
nSendBytes = 0;
nRecvBytes = 0;
nTimeConnected = GetTime();
nTimeOffset = 0;
addrName = addrNameIn == "" ? addr.ToStringIPPort() : addrNameIn;
nVersion = 0;
strSubVer = "";
fWhitelisted = false;
fOneShot = false;
fClient = false; // set by version message
fFeeler = false;
fInbound = fInboundIn;
fNetworkNode = false;
fSuccessfullyConnected = false;
fDisconnect = false;
nRefCount = 0;
nSendSize = 0;
nSendOffset = 0;
hashContinue = uint256();
nStartingHeight = -1;
filterInventoryKnown.reset();
fSendMempool = false;
fGetAddr = false;
nNextLocalAddrSend = 0;
nNextAddrSend = 0;
nNextInvSend = 0;
fRelayTxes = false;
fSentAddr = false;
pfilter = new CBloomFilter();
timeLastMempoolReq = 0;
nLastBlockTime = 0;
nLastTXTime = 0;
nPingNonceSent = 0;
nPingUsecStart = 0;
nPingUsecTime = 0;
fPingQueued = false;
nMinPingUsecTime = std::numeric_limits<int64_t>::max();
minFeeFilter = 0;
lastSentFeeFilter = 0;
nextSendTimeFeeFilter = 0;
BOOST_FOREACH(const std::string &msg, getAllNetMessageTypes())
mapRecvBytesPerMsgCmd[msg] = 0;
mapRecvBytesPerMsgCmd[NET_MESSAGE_COMMAND_OTHER] = 0;
{
LOCK(cs_nLastNodeId);
id = nLastNodeId++;
}
if (fLogIPs)
LogPrint("net", "Added connection to %s peer=%d\n", addrName, id);
else
LogPrint("net", "Added connection peer=%d\n", id);
// Be shy and don't send version until we hear
if (hSocket != INVALID_SOCKET && !fInbound)
PushVersion();
GetNodeSignals().InitializeNode(GetId(), this);
}
CNode::~CNode()
{
CloseSocket(hSocket);
if (pfilter)
delete pfilter;
GetNodeSignals().FinalizeNode(GetId());
}
void CNode::AskFor(const CInv& inv)
{
if (mapAskFor.size() > MAPASKFOR_MAX_SZ || setAskFor.size() > SETASKFOR_MAX_SZ)
return;
// a peer may not have multiple non-responded queue positions for a single inv item
if (!setAskFor.insert(inv.hash).second)
return;
// We're using mapAskFor as a priority queue,
// the key is the earliest time the request can be sent
int64_t nRequestTime;
limitedmap<uint256, int64_t>::const_iterator it = mapAlreadyAskedFor.find(inv.hash);
if (it != mapAlreadyAskedFor.end())
nRequestTime = it->second;
else
nRequestTime = 0;
LogPrint("net", "askfor %s %d (%s) peer=%d\n", inv.ToString(), nRequestTime, DateTimeStrFormat("%H:%M:%S", nRequestTime/1000000), id);
// Make sure not to reuse time indexes to keep things in the same order
int64_t nNow = GetTimeMicros() - 1000000;
static int64_t nLastTime;
++nLastTime;
nNow = std::max(nNow, nLastTime);
nLastTime = nNow;
// Each retry is 2 minutes after the last
nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
if (it != mapAlreadyAskedFor.end())
mapAlreadyAskedFor.update(it, nRequestTime);
else
mapAlreadyAskedFor.insert(std::make_pair(inv.hash, nRequestTime));
mapAskFor.insert(std::make_pair(nRequestTime, inv));
}
void CNode::BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend)
{
ENTER_CRITICAL_SECTION(cs_vSend);
assert(ssSend.size() == 0);
ssSend << CMessageHeader(Params().MessageStart(), pszCommand, 0);
LogPrint("net", "sending: %s ", SanitizeString(pszCommand));
}
void CNode::AbortMessage() UNLOCK_FUNCTION(cs_vSend)
{
ssSend.clear();
LEAVE_CRITICAL_SECTION(cs_vSend);
LogPrint("net", "(aborted)\n");
}
void CNode::EndMessage(const char* pszCommand) UNLOCK_FUNCTION(cs_vSend)
{
// The -*messagestest options are intentionally not documented in the help message,
// since they are only used during development to debug the networking code and are
// not intended for end-users.
if (mapArgs.count("-dropmessagestest") && GetRand(GetArg("-dropmessagestest", 2)) == 0)
{
LogPrint("net", "dropmessages DROPPING SEND MESSAGE\n");
AbortMessage();
return;
}
if (mapArgs.count("-fuzzmessagestest"))
Fuzz(GetArg("-fuzzmessagestest", 10));
if (ssSend.size() == 0)
{
LEAVE_CRITICAL_SECTION(cs_vSend);
return;
}
// Set the size
unsigned int nSize = ssSend.size() - CMessageHeader::HEADER_SIZE;
WriteLE32((uint8_t*)&ssSend[CMessageHeader::MESSAGE_SIZE_OFFSET], nSize);
//log total amount of bytes per command
mapSendBytesPerMsgCmd[std::string(pszCommand)] += nSize + CMessageHeader::HEADER_SIZE;
// Set the checksum
uint256 hash = Hash(ssSend.begin() + CMessageHeader::HEADER_SIZE, ssSend.end());
unsigned int nChecksum = 0;
memcpy(&nChecksum, &hash, sizeof(nChecksum));
assert(ssSend.size () >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum));
memcpy((char*)&ssSend[CMessageHeader::CHECKSUM_OFFSET], &nChecksum, sizeof(nChecksum));
LogPrint("net", "(%d bytes) peer=%d\n", nSize, id);
std::deque<CSerializeData>::iterator it = vSendMsg.insert(vSendMsg.end(), CSerializeData());
ssSend.GetAndClear(*it);
nSendSize += (*it).size();
// If write queue empty, attempt "optimistic write"
if (it == vSendMsg.begin())
SocketSendData(this);
LEAVE_CRITICAL_SECTION(cs_vSend);
}
//
// CBanDB
//
CBanDB::CBanDB()
{
pathBanlist = GetDataDir() / "banlist.dat";
}
bool CBanDB::Write(const banmap_t& banSet)
{
// Generate random temporary filename
unsigned short randv = 0;
GetRandBytes((unsigned char*)&randv, sizeof(randv));
std::string tmpfn = strprintf("banlist.dat.%04x", randv);
// serialize banlist, checksum data up to that point, then append csum
CDataStream ssBanlist(SER_DISK, CLIENT_VERSION);
ssBanlist << FLATDATA(Params().MessageStart());
ssBanlist << banSet;
uint256 hash = Hash(ssBanlist.begin(), ssBanlist.end());
ssBanlist << hash;
// open temp output file, and associate with CAutoFile
boost::filesystem::path pathTmp = GetDataDir() / tmpfn;
FILE *file = fopen(pathTmp.string().c_str(), "wb");
CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
if (fileout.IsNull())
return error("%s: Failed to open file %s", __func__, pathTmp.string());
// Write and commit header, data
try {
fileout << ssBanlist;
}
catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
FileCommit(fileout.Get());
fileout.fclose();
// replace existing banlist.dat, if any, with new banlist.dat.XXXX
if (!RenameOver(pathTmp, pathBanlist))
return error("%s: Rename-into-place failed", __func__);
return true;
}
bool CBanDB::Read(banmap_t& banSet)
{
// open input file, and associate with CAutoFile
FILE *file = fopen(pathBanlist.string().c_str(), "rb");
CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
if (filein.IsNull())
return error("%s: Failed to open file %s", __func__, pathBanlist.string());
// use file size to size memory buffer
uint64_t fileSize = boost::filesystem::file_size(pathBanlist);
uint64_t dataSize = 0;
// Don't try to resize to a negative number if file is small
if (fileSize >= sizeof(uint256))
dataSize = fileSize - sizeof(uint256);
std::vector<unsigned char> vchData;
vchData.resize(dataSize);
uint256 hashIn;
// read data and checksum from file
try {
filein.read((char *)&vchData[0], dataSize);
filein >> hashIn;
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
filein.fclose();
CDataStream ssBanlist(vchData, SER_DISK, CLIENT_VERSION);
// verify stored checksum matches input data
uint256 hashTmp = Hash(ssBanlist.begin(), ssBanlist.end());
if (hashIn != hashTmp)
return error("%s: Checksum mismatch, data corrupted", __func__);
unsigned char pchMsgTmp[4];
try {
// de-serialize file header (network specific magic number) and ..
ssBanlist >> FLATDATA(pchMsgTmp);
// ... verify the network matches ours
if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
return error("%s: Invalid network magic number", __func__);
// de-serialize address data into one CAddrMan object
ssBanlist >> banSet;
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
return true;
}
int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) {
return nNow + (int64_t)(log1p(GetRand(1ULL << 48) * -0.0000000000000035527136788 /* -1/2^48 */) * average_interval_seconds * -1000000.0 + 0.5);
}
/* static */ uint64_t CNode::CalculateKeyedNetGroup(const CAddress& ad)
{
static const uint64_t k0 = GetRand(std::numeric_limits<uint64_t>::max());
static const uint64_t k1 = GetRand(std::numeric_limits<uint64_t>::max());
std::vector<unsigned char> vchNetGroup(ad.GetGroup());
return CSipHasher(k0, k1).Write(&vchNetGroup[0], vchNetGroup.size()).Finalize();
}