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merge bitcoin#20187: test-before-evict bugfix and improvements for block-relay-only peers

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completion of 698a717e from dash#5163 by including:
- 4fe338ab3ed73b3ffb20eedf95500c56ec2920e1
- e8b215a086d91a8774210bb6ce8d1560aaaf0789
- 16d9bfc4172b4f6ce24a3cd1a1cfa3933cd26751
This commit is contained in:
Kittywhiskers Van Gogh 2020-10-19 09:31:51 -04:00 committed by pasta
parent ac0bca1de1
commit 2a9bb8f7fa
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GPG Key ID: 52527BEDABE87984
3 changed files with 53 additions and 16 deletions
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34
src/net.cpp
View File

@ -385,6 +385,11 @@ CNode* CConnman::FindNode(const CService& addr, bool fExcludeDisconnecting)
return nullptr;
}
bool CConnman::AlreadyConnectedToAddress(const CAddress& addr)
{
return FindNode(addr.ToStringIPPort());
}
bool CConnman::CheckIncomingNonce(uint64_t nonce)
{
LOCK(cs_vNodes);
@ -2397,11 +2402,30 @@ void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
if (nTries > 100)
break;
CAddrInfo addr = addrman.SelectTriedCollision();
CAddrInfo addr;
// SelectTriedCollision returns an invalid address if it is empty.
if (!fFeeler || !addr.IsValid()) {
addr = addrman.Select(fFeeler);
if (fFeeler) {
// First, try to get a tried table collision address. This returns
// an empty (invalid) address if there are no collisions to try.
addr = addrman.SelectTriedCollision();
if (!addr.IsValid()) {
// No tried table collisions. Select a new table address
// for our feeler.
addr = addrman.Select(true);
} else if (AlreadyConnectedToAddress(addr)) {
// If test-before-evict logic would have us connect to a
// peer that we're already connected to, just mark that
// address as Good(). We won't be able to initiate the
// connection anyway, so this avoids inadvertently evicting
// a currently-connected peer.
addrman.Good(addr);
// Select a new table address for our feeler instead.
addr = addrman.Select(true);
}
} else {
// Not a feeler
addr = addrman.Select();
}
auto dmn = mnList.GetMNByService(addr);
@ -2768,7 +2792,7 @@ void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
if (!pszDest) {
// banned, discouraged or exact match?
if ((m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect))) || FindNode(addrConnect.ToStringIPPort()))
if ((m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect))) || AlreadyConnectedToAddress(addrConnect))
return;
// local and not a connection to itself?
bool fAllowLocal = Params().AllowMultiplePorts() && addrConnect.GetPort() != GetListenPort();

6
src/net.h
View File

@ -625,6 +625,12 @@ private:
CNode* FindNode(const std::string& addrName, bool fExcludeDisconnecting = true);
CNode* FindNode(const CService& addr, bool fExcludeDisconnecting = true);
/**
* Determine whether we're already connected to a given address, in order to
* avoid initiating duplicate connections.
*/
bool AlreadyConnectedToAddress(const CAddress& addr);
bool AttemptToEvictConnection();
CNode* ConnectNode(CAddress addrConnect, const char *pszDest = nullptr, bool fCountFailure = false, ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY);
void AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr) const;

29
src/net_processing.cpp
View File

@ -3017,14 +3017,8 @@ void PeerManagerImpl::ProcessMessage(
// empty and no one will know who we are, so these mechanisms are
// important to help us connect to the network.
//
// We also update the addrman to record connection success for
// these peers (which include OUTBOUND_FULL_RELAY and FEELER
// connections) so that addrman will have an up-to-date notion of
// which peers are online and available.
//
// We skip these operations for BLOCK_RELAY peers to avoid
// potentially leaking information about our BLOCK_RELAY
// connections via the addrman or address relay.
// We skip this for BLOCK_RELAY peers to avoid potentially leaking
// information about our BLOCK_RELAY connections via address relay.
if (fListen && !m_chainman.ActiveChainstate().IsInitialBlockDownload())
{
CAddress addr = GetLocalAddress(&pfrom.addr, pfrom.GetLocalServices());
@ -3043,11 +3037,24 @@ void PeerManagerImpl::ProcessMessage(
// Get recent addresses
m_connman.PushMessage(&pfrom, CNetMsgMaker(greatest_common_version).Make(NetMsgType::GETADDR));
pfrom.fGetAddr = true;
}
// Moves address from New to Tried table in Addrman, resolves
// tried-table collisions, etc.
if (!pfrom.IsInboundConn()) {
// For non-inbound connections, we update the addrman to record
// connection success so that addrman will have an up-to-date
// notion of which peers are online and available.
//
// While we strive to not leak information about block-relay-only
// connections via the addrman, not moving an address to the tried
// table is also potentially detrimental because new-table entries
// are subject to eviction in the event of addrman collisions. We
// mitigate the information-leak by never calling
// CAddrMan::Connected() on block-relay-only peers; see
// FinalizeNode().
//
// This moves an address from New to Tried table in Addrman,
// resolves tried-table collisions, etc.
m_addrman.Good(pfrom.addr);
}
std::string remoteAddr;