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net: move nLocalHostNonce to CConnman

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This behavior seems to have been quite racy and broken.

Move nLocalHostNonce into CNode, and check received nonces against all
non-fully-connected nodes. If there's a match, assume we've connected
to ourself.
This commit is contained in:
Cory Fields 2016-04-17 20:21:58 -04:00
parent 551e0887db
commit 960cf2e405
3 changed files with 19 additions and 4 deletions
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2
src/main.cpp
View File

@ -5025,7 +5025,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}
// Disconnect if we connected to ourself
if (nNonce == nLocalHostNonce && nNonce > 1)
if (pfrom->fInbound && !connman.CheckIncomingNonce(nNonce))
{
LogPrintf("connected to self at %s, disconnecting\n", pfrom->addr.ToString());
pfrom->fDisconnect = true;

14
src/net.cpp
View File

@ -83,7 +83,6 @@ CCriticalSection cs_mapLocalHost;
std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
static bool vfLimited[NET_MAX] = {};
static CNode* pnodeLocalHost = NULL;
uint64_t nLocalHostNonce = 0;
int nMaxConnections = DEFAULT_MAX_PEER_CONNECTIONS;
std::string strSubVersion;
@ -346,6 +345,16 @@ CNode* CConnman::FindNode(const CService& addr)
return NULL;
}
bool CConnman::CheckIncomingNonce(uint64_t nonce)
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes) {
if (!pnode->fSuccessfullyConnected && !pnode->fInbound && pnode->GetLocalNonce() == nonce)
return false;
}
return true;
}
CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure)
{
if (pszDest == NULL) {
@ -465,7 +474,6 @@ void CNode::PushVersion()
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
@ -2535,6 +2543,8 @@ CNode::CNode(NodeId idIn, SOCKET hSocketIn, const CAddress& addrIn, const std::s
nextSendTimeFeeFilter = 0;
id = idIn;
GetRandBytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce));
BOOST_FOREACH(const std::string &msg, getAllNetMessageTypes())
mapRecvBytesPerMsgCmd[msg] = 0;
mapRecvBytesPerMsgCmd[NET_MESSAGE_COMMAND_OTHER] = 0;

7
src/net.h
View File

@ -114,6 +114,7 @@ public:
void Stop();
bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false, bool fFeeler = false);
bool CheckIncomingNonce(uint64_t nonce);
bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
bool ForEachNode(std::function<bool(CNode* pnode)> func);
@ -297,7 +298,6 @@ extern bool fListen;
extern ServiceFlags nLocalServices;
extern ServiceFlags nRelevantServices;
extern bool fRelayTxes;
extern uint64_t nLocalHostNonce;
/** Maximum number of connections to simultaneously allow (aka connection slots) */
extern int nMaxConnections;
@ -523,12 +523,17 @@ private:
static uint64_t CalculateKeyedNetGroup(const CAddress& ad);
uint64_t nLocalHostNonce;
public:
NodeId GetId() const {
return id;
}
uint64_t GetLocalNonce() const {
return nLocalHostNonce;
}
int GetRefCount()
{
assert(nRefCount >= 0);