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Merge pull request #5288

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e3cae52 Added -whiteconnections=<n> option (Josh Lehan)
This commit is contained in:
Wladimir J. van der Laan 2015-07-10 15:06:50 +02:00
commit 445220544e
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GPG Key ID: 74810B012346C9A6
3 changed files with 69 additions and 12 deletions
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54
src/init.cpp
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@ -330,6 +330,7 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += HelpMessageOpt("-whitebind=<addr>", _("Bind to given address and whitelist peers connecting to it. Use [host]:port notation for IPv6"));
strUsage += HelpMessageOpt("-whitelist=<netmask>", _("Whitelist peers connecting from the given netmask or IP address. Can be specified multiple times.") +
" " + _("Whitelisted peers cannot be DoS banned and their transactions are always relayed, even if they are already in the mempool, useful e.g. for a gateway"));
strUsage += HelpMessageOpt("-whiteconnections=<n>", strprintf(_("Reserve this many inbound connections for whitelisted peers (default: %d)"), 0));
#ifdef ENABLE_WALLET
strUsage += HelpMessageGroup(_("Wallet options:"));
@ -725,16 +726,6 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
LogPrintf("%s: parameter interaction: -zapwallettxes=<mode> -> setting -rescan=1\n", __func__);
}
// Make sure enough file descriptors are available
int nBind = std::max((int)mapArgs.count("-bind") + (int)mapArgs.count("-whitebind"), 1);
nMaxConnections = GetArg("-maxconnections", 125);
nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
if (nFD < MIN_CORE_FILEDESCRIPTORS)
return InitError(_("Not enough file descriptors available."));
if (nFD - MIN_CORE_FILEDESCRIPTORS < nMaxConnections)
nMaxConnections = nFD - MIN_CORE_FILEDESCRIPTORS;
// if using block pruning, then disable txindex
if (GetArg("-prune", 0)) {
if (GetBoolArg("-txindex", false))
@ -745,6 +736,47 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
}
#endif
}
// Make sure enough file descriptors are available
int nBind = std::max((int)mapArgs.count("-bind") + (int)mapArgs.count("-whitebind"), 1);
int nUserMaxConnections = GetArg("-maxconnections", 125);
nMaxConnections = std::max(nUserMaxConnections, 0);
int nUserWhiteConnections = GetArg("-whiteconnections", 0);
nWhiteConnections = std::max(nUserWhiteConnections, 0);
if ((mapArgs.count("-whitelist")) || (mapArgs.count("-whitebind"))) {
if (!(mapArgs.count("-maxconnections"))) {
// User is using whitelist feature,
// but did not specify -maxconnections parameter.
// Silently increase the default to compensate,
// so that the whitelist connection reservation feature
// does not inadvertently reduce the default
// inbound connection capacity of the network.
nMaxConnections += nWhiteConnections;
}
} else {
// User not using whitelist feature.
// Silently disable connection reservation,
// for the same reason as above.
nWhiteConnections = 0;
}
// Trim requested connection counts, to fit into system limitations
nMaxConnections = std::max(std::min(nMaxConnections, (int)(FD_SETSIZE - nBind - MIN_CORE_FILEDESCRIPTORS)), 0);
int nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS);
if (nFD < MIN_CORE_FILEDESCRIPTORS)
return InitError(_("Not enough file descriptors available."));
nMaxConnections = std::min(nFD - MIN_CORE_FILEDESCRIPTORS, nMaxConnections);
if (nMaxConnections < nUserMaxConnections)
InitWarning(strprintf(_("Reducing -maxconnections from %d to %d, because of system limitations."), nUserMaxConnections, nMaxConnections));
// Connection capacity is prioritized in this order:
// outbound connections (hardcoded to 8),
// then whitelisted connections,
// then non-whitelisted connections get whatever's left (if any).
if ((nWhiteConnections > 0) && (nWhiteConnections >= (nMaxConnections - 8)))
InitWarning(strprintf(_("All non-whitelisted incoming connections will be dropped, because -whiteconnections is %d and -maxconnections is only %d."), nWhiteConnections, nMaxConnections));
// ********************************************************* Step 3: parameter-to-internal-flags
@ -921,6 +953,8 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
LogPrintf("Using data directory %s\n", strDataDir);
LogPrintf("Using config file %s\n", GetConfigFile().string());
LogPrintf("Using at most %i connections (%i file descriptors available)\n", nMaxConnections, nFD);
if (nWhiteConnections > 0)
LogPrintf("Reserving %i of these connections for whitelisted inbound peers\n", nWhiteConnections);
std::ostringstream strErrors;
LogPrintf("Using %u threads for script verification\n", nScriptCheckThreads);

14
src/net.cpp
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@ -79,6 +79,7 @@ uint64_t nLocalHostNonce = 0;
static std::vector<ListenSocket> vhListenSocket;
CAddrMan addrman;
int nMaxConnections = 125;
int nWhiteConnections = 0;
bool fAddressesInitialized = false;
vector<CNode*> vNodes;
@ -928,6 +929,7 @@ void ThreadSocketHandler()
SOCKET hSocket = accept(hListenSocket.socket, (struct sockaddr*)&sockaddr, &len);
CAddress addr;
int nInbound = 0;
int nMaxInbound = nMaxConnections - MAX_OUTBOUND_CONNECTIONS;
if (hSocket != INVALID_SOCKET)
if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr))
@ -947,8 +949,14 @@ void ThreadSocketHandler()
if (nErr != WSAEWOULDBLOCK)
LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));
}
else if (nInbound >= nMaxConnections - MAX_OUTBOUND_CONNECTIONS)
else if (nInbound >= nMaxInbound)
{
LogPrint("net", "connection from %s dropped (full)\n", addr.ToString());
CloseSocket(hSocket);
}
else if (!whitelisted && (nInbound >= (nMaxInbound - nWhiteConnections)))
{
LogPrint("net", "connection from %s dropped (non-whitelisted)\n", addr.ToString());
CloseSocket(hSocket);
}
else if (CNode::IsBanned(addr) && !whitelisted)
@ -962,6 +970,8 @@ void ThreadSocketHandler()
pnode->AddRef();
pnode->fWhitelisted = whitelisted;
LogPrint("net", "connection from %s accepted\n", addr.ToString());
{
LOCK(cs_vNodes);
vNodes.push_back(pnode);
@ -2295,4 +2305,4 @@ void DumpBanlist()
LogPrint("net", "Flushed %d banned node ips/subnets to banlist.dat %dms\n",
banmap.size(), GetTimeMillis() - nStart);
}
}

13
src/net.h
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@ -141,7 +141,20 @@ extern bool fListen;
extern uint64_t nLocalServices;
extern uint64_t nLocalHostNonce;
extern CAddrMan addrman;
// The allocation of connections against the maximum allowed (nMaxConnections)
// is prioritized as follows:
// 1st: Outbound connections (MAX_OUTBOUND_CONNECTIONS)
// 2nd: Inbound connections from whitelisted peers (nWhiteConnections)
// 3rd: Inbound connections from non-whitelisted peers
// Thus, the number of connection slots for the general public to use is:
// nMaxConnections - (MAX_OUTBOUND_CONNECTIONS + nWhiteConnections)
// Any additional inbound connections beyond limits will be immediately closed
/** Maximum number of connections to simultaneously allow (aka connection slots) */
extern int nMaxConnections;
/** Number of connection slots to reserve for inbound from whitelisted peers */
extern int nWhiteConnections;
extern std::vector<CNode*> vNodes;
extern CCriticalSection cs_vNodes;