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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2011 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_NET_H
#define BITCOIN_NET_H
#include <deque>
#include <boost/array.hpp>
#include <boost/foreach.hpp>
#include <openssl/rand.h>
#ifndef __WXMSW__
#include <arpa/inet.h>
#endif
#include "protocol.h"
class CAddrDB;
class CRequestTracker;
class CNode;
class CBlockIndex;
extern int nBestHeight;
extern int nConnectTimeout;
inline unsigned int ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 10*1000); }
inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 10*1000); }
static const unsigned int PUBLISH_HOPS = 5;
bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet, int nTimeout=nConnectTimeout);
bool Lookup(const char *pszName, std::vector<CAddress>& vaddr, int nServices, int nMaxSolutions, bool fAllowLookup = false, int portDefault = 0, bool fAllowPort = false);
bool Lookup(const char *pszName, CAddress& addr, int nServices, bool fAllowLookup = false, int portDefault = 0, bool fAllowPort = false);
bool GetMyExternalIP(unsigned int& ipRet);
bool AddAddress(CAddress addr, int64 nTimePenalty=0, CAddrDB *pAddrDB=NULL);
void AddressCurrentlyConnected(const CAddress& addr);
CNode* FindNode(unsigned int ip);
CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
bool AnySubscribed(unsigned int nChannel);
void MapPort(bool fMapPort);
12 years ago
void DNSAddressSeed();
bool BindListenPort(std::string& strError=REF(std::string()));
void StartNode(void* parg);
bool StopNode();
enum
{
MSG_TX = 1,
MSG_BLOCK,
};
class CRequestTracker
{
public:
void (*fn)(void*, CDataStream&);
void* param1;
explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL)
{
fn = fnIn;
param1 = param1In;
}
bool IsNull()
{
return fn == NULL;
}
};
extern bool fClient;
extern bool fAllowDNS;
extern uint64 nLocalServices;
extern CAddress addrLocalHost;
extern uint64 nLocalHostNonce;
extern boost::array<int, 10> vnThreadsRunning;
extern std::vector<CNode*> vNodes;
extern CCriticalSection cs_vNodes;
extern std::map<std::vector<unsigned char>, CAddress> mapAddresses;
extern CCriticalSection cs_mapAddresses;
extern std::map<CInv, CDataStream> mapRelay;
extern std::deque<std::pair<int64, CInv> > vRelayExpiration;
extern CCriticalSection cs_mapRelay;
extern std::map<CInv, int64> mapAlreadyAskedFor;
// Settings
extern int fUseProxy;
extern CAddress addrProxy;
class CNode
{
public:
// socket
uint64 nServices;
SOCKET hSocket;
CDataStream vSend;
CDataStream vRecv;
CCriticalSection cs_vSend;
CCriticalSection cs_vRecv;
int64 nLastSend;
int64 nLastRecv;
int64 nLastSendEmpty;
int64 nTimeConnected;
unsigned int nHeaderStart;
unsigned int nMessageStart;
CAddress addr;
int nVersion;
std::string strSubVer;
bool fClient;
bool fInbound;
bool fNetworkNode;
bool fSuccessfullyConnected;
bool fDisconnect;
protected:
int nRefCount;
// Denial-of-service detection/prevention
// Key is ip address, value is banned-until-time
static std::map<unsigned int, int64> setBanned;
static CCriticalSection cs_setBanned;
int nMisbehavior;
public:
int64 nReleaseTime;
std::map<uint256, CRequestTracker> mapRequests;
CCriticalSection cs_mapRequests;
uint256 hashContinue;
CBlockIndex* pindexLastGetBlocksBegin;
uint256 hashLastGetBlocksEnd;
int nStartingHeight;
// flood relay
std::vector<CAddress> vAddrToSend;
std::set<CAddress> setAddrKnown;
bool fGetAddr;
std::set<uint256> setKnown;
// inventory based relay
std::set<CInv> setInventoryKnown;
std::vector<CInv> vInventoryToSend;
CCriticalSection cs_inventory;
std::multimap<int64, CInv> mapAskFor;
// publish and subscription
std::vector<char> vfSubscribe;
CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
{
nServices = 0;
hSocket = hSocketIn;
vSend.SetType(SER_NETWORK);
vSend.SetVersion(0);
vRecv.SetType(SER_NETWORK);
vRecv.SetVersion(0);
// Version 0.2 obsoletes 20 Feb 2012
if (GetTime() > 1329696000)
{
vSend.SetVersion(209);
vRecv.SetVersion(209);
}
nLastSend = 0;
nLastRecv = 0;
nLastSendEmpty = GetTime();
nTimeConnected = GetTime();
nHeaderStart = -1;
nMessageStart = -1;
addr = addrIn;
nVersion = 0;
strSubVer = "";
fClient = false; // set by version message
fInbound = fInboundIn;
fNetworkNode = false;
fSuccessfullyConnected = false;
fDisconnect = false;
nRefCount = 0;
nReleaseTime = 0;
hashContinue = 0;
pindexLastGetBlocksBegin = 0;
hashLastGetBlocksEnd = 0;
nStartingHeight = -1;
fGetAddr = false;
vfSubscribe.assign(256, false);
nMisbehavior = 0;
// Be shy and don't send version until we hear
if (!fInbound)
PushVersion();
}
~CNode()
{
if (hSocket != INVALID_SOCKET)
{
closesocket(hSocket);
hSocket = INVALID_SOCKET;
}
}
private:
CNode(const CNode&);
void operator=(const CNode&);
public:
int GetRefCount()
{
return std::max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0);
}
CNode* AddRef(int64 nTimeout=0)
{
if (nTimeout != 0)
nReleaseTime = std::max(nReleaseTime, GetTime() + nTimeout);
else
nRefCount++;
return this;
}
void Release()
{
nRefCount--;
}
void AddAddressKnown(const CAddress& addr)
{
setAddrKnown.insert(addr);
}
void PushAddress(const CAddress& addr)
{
// Known checking here is only to save space from duplicates.
// SendMessages will filter it again for knowns that were added
// after addresses were pushed.
if (addr.IsValid() && !setAddrKnown.count(addr))
vAddrToSend.push_back(addr);
}
void AddInventoryKnown(const CInv& inv)
{
CRITICAL_BLOCK(cs_inventory)
setInventoryKnown.insert(inv);
}
void PushInventory(const CInv& inv)
{
CRITICAL_BLOCK(cs_inventory)
if (!setInventoryKnown.count(inv))
vInventoryToSend.push_back(inv);
}
void AskFor(const CInv& inv)
{
// We're using mapAskFor as a priority queue,
// the key is the earliest time the request can be sent
int64& nRequestTime = mapAlreadyAskedFor[inv];
printf("askfor %s %"PRI64d"\n", inv.ToString().c_str(), nRequestTime);
// Make sure not to reuse time indexes to keep things in the same order
int64 nNow = (GetTime() - 1) * 1000000;
static int64 nLastTime;
nLastTime = nNow = std::max(nNow, ++nLastTime);
// Each retry is 2 minutes after the last
nRequestTime = std::max(nRequestTime + 2 * 60 * 1000000, nNow);
mapAskFor.insert(std::make_pair(nRequestTime, inv));
}
void BeginMessage(const char* pszCommand)
{
cs_vSend.Enter("cs_vSend", __FILE__, __LINE__);
if (nHeaderStart != -1)
AbortMessage();
nHeaderStart = vSend.size();
vSend << CMessageHeader(pszCommand, 0);
nMessageStart = vSend.size();
if (fDebug) {
printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
printf("sending: %s ", pszCommand);
}
}
void AbortMessage()
{
if (nHeaderStart == -1)
return;
vSend.resize(nHeaderStart);
nHeaderStart = -1;
nMessageStart = -1;
cs_vSend.Leave();
if (fDebug)
printf("(aborted)\n");
}
void EndMessage()
{
if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
{
printf("dropmessages DROPPING SEND MESSAGE\n");
AbortMessage();
return;
}
if (nHeaderStart == -1)
return;
// Set the size
unsigned int nSize = vSend.size() - nMessageStart;
memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
// Set the checksum
if (vSend.GetVersion() >= 209)
{
uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end());
unsigned int nChecksum = 0;
memcpy(&nChecksum, &hash, sizeof(nChecksum));
assert(nMessageStart - nHeaderStart >= offsetof(CMessageHeader, nChecksum) + sizeof(nChecksum));
memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nChecksum), &nChecksum, sizeof(nChecksum));
}
if (fDebug) {
printf("(%d bytes)\n", nSize);
}
nHeaderStart = -1;
nMessageStart = -1;
cs_vSend.Leave();
}
void EndMessageAbortIfEmpty()
{
if (nHeaderStart == -1)
return;
int nSize = vSend.size() - nMessageStart;
if (nSize > 0)
EndMessage();
else
AbortMessage();
}
void PushVersion()
{
/// when NTP implemented, change to just nTime = GetAdjustedTime()
int64 nTime = (fInbound ? GetAdjustedTime() : GetTime());
CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr);
CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost);
RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
PushMessage("version", VERSION, nLocalServices, nTime, addrYou, addrMe,
nLocalHostNonce, std::string(pszSubVer), nBestHeight);
}
void PushMessage(const char* pszCommand)
{
try
{
BeginMessage(pszCommand);
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1>
void PushMessage(const char* pszCommand, const T1& a1)
{
try
{
BeginMessage(pszCommand);
vSend << a1;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4, typename T5>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4 << a5;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4 << a5 << a6;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
{
try
{
BeginMessage(pszCommand);
vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
EndMessage();
}
catch (...)
{
AbortMessage();
throw;
}
}
void PushRequest(const char* pszCommand,
void (*fn)(void*, CDataStream&), void* param1)
{
uint256 hashReply;
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
CRITICAL_BLOCK(cs_mapRequests)
mapRequests[hashReply] = CRequestTracker(fn, param1);
PushMessage(pszCommand, hashReply);
}
template<typename T1>
void PushRequest(const char* pszCommand, const T1& a1,
void (*fn)(void*, CDataStream&), void* param1)
{
uint256 hashReply;
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
CRITICAL_BLOCK(cs_mapRequests)
mapRequests[hashReply] = CRequestTracker(fn, param1);
PushMessage(pszCommand, hashReply, a1);
}
template<typename T1, typename T2>
void PushRequest(const char* pszCommand, const T1& a1, const T2& a2,
void (*fn)(void*, CDataStream&), void* param1)
{
uint256 hashReply;
RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
CRITICAL_BLOCK(cs_mapRequests)
mapRequests[hashReply] = CRequestTracker(fn, param1);
PushMessage(pszCommand, hashReply, a1, a2);
}
void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd);
bool IsSubscribed(unsigned int nChannel);
void Subscribe(unsigned int nChannel, unsigned int nHops=0);
void CancelSubscribe(unsigned int nChannel);
void CloseSocketDisconnect();
void Cleanup();
// Denial-of-service detection/prevention
// The idea is to detect peers that are behaving
// badly and disconnect/ban them, but do it in a
// one-coding-mistake-won't-shatter-the-entire-network
// way.
// IMPORTANT: There should be nothing I can give a
// node that it will forward on that will make that
// node's peers drop it. If there is, an attacker
// can isolate a node and/or try to split the network.
// Dropping a node for sending stuff that is invalid
// now but might be valid in a later version is also
// dangerous, because it can cause a network split
// between nodes running old code and nodes running
// new code.
static void ClearBanned(); // needed for unit testing
static bool IsBanned(unsigned int ip);
bool Misbehaving(int howmuch); // 1 == a little, 100 == a lot
};
inline void RelayInventory(const CInv& inv)
{
// Put on lists to offer to the other nodes
CRITICAL_BLOCK(cs_vNodes)
BOOST_FOREACH(CNode* pnode, vNodes)
pnode->PushInventory(inv);
}
template<typename T>
void RelayMessage(const CInv& inv, const T& a)
{
CDataStream ss(SER_NETWORK);
ss.reserve(10000);
ss << a;
RelayMessage(inv, ss);
}
template<>
inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
{
CRITICAL_BLOCK(cs_mapRelay)
{
// Expire old relay messages
while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
{
mapRelay.erase(vRelayExpiration.front().second);
vRelayExpiration.pop_front();
}
// Save original serialized message so newer versions are preserved
mapRelay[inv] = ss;
vRelayExpiration.push_back(std::make_pair(GetTime() + 15 * 60, inv));
}
RelayInventory(inv);
}
//
// Templates for the publish and subscription system.
// The object being published as T& obj needs to have:
// a set<unsigned int> setSources member
// specializations of AdvertInsert and AdvertErase
// Currently implemented for CTable and CProduct.
//
template<typename T>
void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
{
// Add to sources
obj.setSources.insert(pfrom->addr.ip);
if (!AdvertInsert(obj))
return;
// Relay
CRITICAL_BLOCK(cs_vNodes)
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
pnode->PushMessage("publish", nChannel, nHops, obj);
}
template<typename T>
void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
{
uint256 hash = obj.GetHash();
CRITICAL_BLOCK(cs_vNodes)
BOOST_FOREACH(CNode* pnode, vNodes)
if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
AdvertErase(obj);
}
template<typename T>
void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
{
// Remove a source
obj.setSources.erase(pfrom->addr.ip);
// If no longer supported by any sources, cancel it
if (obj.setSources.empty())
AdvertStopPublish(pfrom, nChannel, nHops, obj);
}
#endif