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authorGregory Maxwell <greg@xiph.org>2015-04-19 12:34:43 -0700
committerGregory Maxwell <greg@xiph.org>2016-05-26 12:56:27 +0000
commitc769c4af11fc58dd4813d328c7f71042bc577676 (patch)
tree7c86c072c97dd185d723cc1bac363a3c34b000ff
parentf6b7df3155ddb4cedfbcf5d3eb3383d4614b3a85 (diff)
Avoid counting failed connect attempts when probably offline.
If a node is offline failed outbound connection attempts will crank up the addrman counter and effectively blow away our state. This change reduces the problem by only counting attempts made while the node believes it has outbound connections to at least two netgroups. Connect and addnode connections are also not counted, as there is no reason to unequally penalize them for their more frequent connections -- though there should be no real effect from this unless their addnode configureation is later removed. Wasteful repeated connection attempts while only a few connections are up are avoided via nLastTry. This is still somewhat incomplete protection because our outbound peers could be down but not timed out or might all be on 'local' networks (although the requirement for multiple netgroups helps).
-rw-r--r--src/addrman.cpp4
-rw-r--r--src/addrman.h6
-rw-r--r--src/net.cpp20
-rw-r--r--src/net.h2
-rw-r--r--src/rpc/net.cpp2
5 files changed, 17 insertions, 17 deletions
diff --git a/src/addrman.cpp b/src/addrman.cpp
index 6c54cfa4cd..0a1745c10c 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -311,7 +311,7 @@ bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimeP
return fNew;
}
-void CAddrMan::Attempt_(const CService& addr, int64_t nTime)
+void CAddrMan::Attempt_(const CService& addr, bool fCountFailure, int64_t nTime)
{
CAddrInfo* pinfo = Find(addr);
@@ -327,7 +327,7 @@ void CAddrMan::Attempt_(const CService& addr, int64_t nTime)
// update info
info.nLastTry = nTime;
- info.nAttempts++;
+ if (fCountFailure) info.nAttempts++;
}
CAddrInfo CAddrMan::Select_(bool newOnly)
diff --git a/src/addrman.h b/src/addrman.h
index 3085450450..65ca79fa02 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -230,7 +230,7 @@ protected:
bool Add_(const CAddress &addr, const CNetAddr& source, int64_t nTimePenalty);
//! Mark an entry as attempted to connect.
- void Attempt_(const CService &addr, int64_t nTime);
+ void Attempt_(const CService &addr, bool fCountFailure, int64_t nTime);
//! Select an address to connect to, if newOnly is set to true, only the new table is selected from.
CAddrInfo Select_(bool newOnly);
@@ -532,12 +532,12 @@ public:
}
//! Mark an entry as connection attempted to.
- void Attempt(const CService &addr, int64_t nTime = GetAdjustedTime())
+ void Attempt(const CService &addr, bool fCountFailure, int64_t nTime = GetAdjustedTime())
{
{
LOCK(cs);
Check();
- Attempt_(addr, nTime);
+ Attempt_(addr, fCountFailure, nTime);
Check();
}
}
diff --git a/src/net.cpp b/src/net.cpp
index bbd23d292a..f30321869a 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -367,7 +367,7 @@ CNode* FindNode(const CService& addr)
return NULL;
}
-CNode* ConnectNode(CAddress addrConnect, const char *pszDest)
+CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure)
{
if (pszDest == NULL) {
if (IsLocal(addrConnect))
@@ -399,7 +399,7 @@ CNode* ConnectNode(CAddress addrConnect, const char *pszDest)
return NULL;
}
- addrman.Attempt(addrConnect);
+ addrman.Attempt(addrConnect, fCountFailure);
// Add node
CNode* pnode = new CNode(hSocket, addrConnect, pszDest ? pszDest : "", false);
@@ -416,7 +416,7 @@ CNode* ConnectNode(CAddress addrConnect, const char *pszDest)
} 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);
+ addrman.Attempt(addrConnect, fCountFailure);
}
return NULL;
@@ -1533,7 +1533,7 @@ void static ProcessOneShot()
CAddress addr;
CSemaphoreGrant grant(*semOutbound, true);
if (grant) {
- if (!OpenNetworkConnection(addr, &grant, strDest.c_str(), true))
+ if (!OpenNetworkConnection(addr, false, &grant, strDest.c_str(), true))
AddOneShot(strDest);
}
}
@@ -1549,7 +1549,7 @@ void ThreadOpenConnections()
BOOST_FOREACH(const std::string& strAddr, mapMultiArgs["-connect"])
{
CAddress addr;
- OpenNetworkConnection(addr, NULL, strAddr.c_str());
+ OpenNetworkConnection(addr, false, NULL, strAddr.c_str());
for (int i = 0; i < 10 && i < nLoop; i++)
{
MilliSleep(500);
@@ -1633,7 +1633,7 @@ void ThreadOpenConnections()
}
if (addrConnect.IsValid())
- OpenNetworkConnection(addrConnect, &grant);
+ OpenNetworkConnection(addrConnect, (int)setConnected.size() >= min(nMaxConnections - 1, 2), &grant);
}
}
@@ -1655,7 +1655,7 @@ void ThreadOpenAddedConnections()
BOOST_FOREACH(const std::string& strAddNode, lAddresses) {
CAddress addr;
CSemaphoreGrant grant(*semOutbound);
- OpenNetworkConnection(addr, &grant, strAddNode.c_str());
+ OpenNetworkConnection(addr, false, &grant, strAddNode.c_str());
MilliSleep(500);
}
MilliSleep(120000); // Retry every 2 minutes
@@ -1694,7 +1694,7 @@ void ThreadOpenAddedConnections()
BOOST_FOREACH(std::vector<CService>& vserv, lservAddressesToAdd)
{
CSemaphoreGrant grant(*semOutbound);
- OpenNetworkConnection(CAddress(vserv[i % vserv.size()]), &grant);
+ OpenNetworkConnection(CAddress(vserv[i % vserv.size()]), false, &grant);
MilliSleep(500);
}
MilliSleep(120000); // Retry every 2 minutes
@@ -1702,7 +1702,7 @@ void ThreadOpenAddedConnections()
}
// if successful, this moves the passed grant to the constructed node
-bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot)
+bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot)
{
//
// Initiate outbound network connection
@@ -1716,7 +1716,7 @@ bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOu
} else if (FindNode(std::string(pszDest)))
return false;
- CNode* pnode = ConnectNode(addrConnect, pszDest);
+ CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure);
boost::this_thread::interruption_point();
if (!pnode)
diff --git a/src/net.h b/src/net.h
index 998ee49260..3332496c05 100644
--- a/src/net.h
+++ b/src/net.h
@@ -83,7 +83,7 @@ CNode* FindNode(const CNetAddr& ip);
CNode* FindNode(const CSubNet& subNet);
CNode* FindNode(const std::string& addrName);
CNode* FindNode(const CService& ip);
-bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
+bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
void MapPort(bool fUseUPnP);
unsigned short GetListenPort();
bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index e09af89656..8f62d636d8 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -219,7 +219,7 @@ UniValue addnode(const UniValue& params, bool fHelp)
if (strCommand == "onetry")
{
CAddress addr;
- OpenNetworkConnection(addr, NULL, strNode.c_str());
+ OpenNetworkConnection(addr, false, NULL, strNode.c_str());
return NullUniValue;
}